Union Special LF600 User Manual

Adjusting instructions and illustrated parts list

Twoand Three-needle, LFGOO "Standard Class"

plain feed flatbed machines.

From the library of: Superior Sewing Machine & Supply LLC

FOREWORD

This technical manual has been prepared to guide you in the maintenance of your new UNION SPECIAL machine. Careful attention to the instructions for operating and adjusting these machines will enable you to maintain the superior performance and reliability designed and built into every UNION SPECIAL machine.

The Adjusting Instruction portion of this manual explains in detail the proper setting for_ each of the components related to forming the stitch and completing the functions of the machine. Figures are used to illustrate the adjustments using reference letters to point out specific items discussed.

Adjustments are presented in sequence so that a logical progression is accomplished. Some adjustments performed out of sequence may have an adverse effect on the function of other related parts.

Implementation ofPreventive Maintenance Schedule can bring about significant improvements in operator productivity by avoiding costly equipment breakdowns. Whenever it becomes necessary to make repairs or replace parts on your machine, be sure to insist on genuine UNION SPECIAL Repair Parts. These parts are designed specifically for your machine and manufactured with utmost precision to assure long lasting service.

This Catalog has been made on the basis of available information. Changes in design and/or improvements may incorporate a slight modification of configuration in illustrations or part numbers.

	CATALOG N0.143 N
	For Styles
LF612KlOOHB	LF612Kl01MBE
LF612KlOOHC	LF612K112HJ
LF612KlOOHJ	LF613K100HJ
LF612KlOOHR	LF613KlOOHR
LF612KlOOMP	LF613K101HR
LF612KlOOMX	LF613Kll2HR

First Edition

Copyright 1990

By

Union Special Corporation

Rights Reserved In All Countries

Printed in U.S.A.

July, 1990

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Each UNION SPECIAL machine is identified by a Style number, which on this machine Class, is stamped into the Style plate affixed to the right front of machine. Serial number is stamped into bed casting at the left rear base of machine

NOTE: Instructions stating direction or location, such as right, left, front or rear of machine, are given relative to the operator's position at the machine, unless otherwise noted. The handwheel rotates counterclockwise in operating direction as viewed from the right end of machine.

STYLES OF MACHINES

High speed, maximum performance, double locked stitch, plain feed flatbed machine. Totally enclosed feed and looper drive mechanism, fully automatic forced feed lubricating system with easily replaceable oil filter, quick stitch change, independently driven rear needle guard and quick adjustable looper avoid.

LF612K100HB Two needle, HIGH capacity, for seaming trousers and similar garments made of medium heavy to heavy weight material. Right needle in front. Standard recommended needle Type 128 GBS, Size 100/040. Available in 7 S.P.I. ONlY. Standard gauge No.1 ONI.Y. The seam produced has two rows of stitching with the strength of 14 S.P.I., yet the fabric is moved forward at. a rate of 7 S.P.I. Maximum recommended speed 6500 R.P.M., depending on operation.

LF612K100HC Same as Style LF612KlOOHB except available in 10 S.P.I. ONlY.

LF612K100HJ Two needle, HIGH capacity, for attaching risers to dungarees, piecing sleeves on denim jackets and attaching overall bibs. Includes double lap seam folder 3/32 inch (2.4mm) capacity. Left needle in front. Standard recommended needle Type 128 GAS, Size 125/049. Stitch range 7-14 S.P.I. Standard gauge Nos. 16 and 18. Maximum recommended speed 6500 R.P.M., depending on operation.

LF612K100HR Same as Style LF612K100HJ except Standard gauge No. 18 ONLY. Stitch range 7-10 S.P.I.

LF612K100MP Two needle, MEDIUM capacity, for piecing sleeves, joining shoulders and setting sleeves on ordinary quality shirts made with light to medium weight materials. Includes double lap seam folder 1/16 inch (1.6mm) capacity. Standard recommended needle Type 192 GLS, Size 75/029. Stitch range 9-20 S.P.I. Standard gauge Nos. 12 and 16. Maximum recommended speed 6500 R.P.M., depending on operation.

LF612K1 OOMX Two needle, MEDIUM capacity for quilting collar bands of shirts and similar garments. Standard recommended needle Type 192 GLS, Size 90/036. Stitch range 14-20 S.P.I. Standard gauge No. 24 ONLY. Maximum recommended speed 6500 R.P.M., depending on operation.

LF612K101 MBE Two needle, MEDIUM capacity, for hemming bloomers. Equipped with Close-Coupled Roller Puller. Standard recommended needle Type 192 GLS, Size 80/032. Stitch range 6-12 S.P.I. Standard gauge No. 16 ONLY. Maximum recommended speed 6500 R.P.M., depending on operation.

LF612K112HJ Same as Style LF612K100HJ exceptequipped with power"AlR-KLIPP" ® Chain Cutter. Standard recommended needle Type 128 GAS, 125/049.

LF613K100HJ Three needle, HIGH capacity, for seaming wind breakers, mackinaws, lumber jacks and for similar operations on medium heavy to heavy weight material. Equipped with tractor

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type presser foot. Includes double lap seam folder 3/32 inch (2.4mm) capacity. Standard recommended needle Type 128 GAS, Size 125/049. Stitch range 7-10 S.P.I. Standard gauge Nos. 8 and 9. Maximum recommended speed 6500 R.P.M., depending on operation.

LF613K100HR Three needle, HIGH capacity, for seaming sanforized denim and similar operations on medium to heavy weight materials. Includes double lap seam folder 1/8 inch (3.2mm) capacity. Standard recommended needle Type 128 GAS, Size 125/049. Stitch range 7-14 S.P.I. Standard gauge Nos. 8 and 9. Maximum recommended speed 6500 R.P.M., depending on operation.

LF613K101HR Three needle, HIGH capacity, for seaming sanforized denim and similar operations. Equipped with Close-Coupled Roller Puller. Includes double lap seam folder. 1/8 inch (3.2mm) capacity. Standard recommended needle Type 128 GAS, Size 125/049. Stitch range 7-10 S.P.I. Standard gauge Nos. 8 and 9. Maximum recommended speed 6500 R.P.M., depending on operation.

LF613K112HR SameasStyleLF613K100HRexcept-equippedwithpower"AIR-KLIPP®" ChainCutter.

®"AIR-KLIPP" is a registered trademark of Union Special Corporation.

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SAFETY RULES

A

CAUTION!

THIS SYMBOL INDICATES YOUR PERSONAL SAFETY IS INVOLVED

TO PREVENT PERSONAL INJURY:

-All power sources to the machine MUST be TURNED OFF before threading, oiling, adjusting, or replacing parts.

-Wear safety glasses.

-All shields and guards MUST be in position before operating machine.

-DO NOT tamper with safety shields, guards, etc., while machine is in operation.

LUBRICATION

IMPORTANT: Machine must be in a leveled position.

Oil has been drained from main reservoir before shipment. Use a straight mineral oil with a Saybolt viscosity of90 to 125 seconds at 100 ° Fahrenheit. This is equivalent to UNION SPECIAL Specification No. 175. Remove oil filler cap (A, Fig. 1) and fill to the TOP line of oil level gauge (B). Replace oil filler cap.

CAUTION! On new machines, machines that have been out of service for an extended period of time OR machines that have been drained of oil and refilled .... RUN MACHINE SLOWLY at 300 R.P.M. for approximately five minutes while paying strict attention to the oil flow indicator which should rise in the oil filler cap (A) and remain steady while machine is running. This must be noted to ensure that oil flow indicator is functioning and oil is circulating. Check oil level while machine is running which MUST be maintained between the red lines of oil level gauge.

To maintain maximum recommended speed and serviceability of these machines, refer to GeneralPreventive Maintenance Schedule. Under no circumstances, should oil remain in the machine for more than one year. Oil drain plug is located in bottom ofoil pan. ALWAYS change oil filter when oil is changed. At this time, evaluate the contaminated condition of the oil to determine if the oil filter should be changed more or less frequently. To replace filter, remove four screws (C, Fig. 1) and cover (D); lift out filter cartridge. REMOVE (brass) BY-PASS VALVE FROMTOPOFOLDFILTERAND INSTALL IN NEW FILTER. Reassemble in reverse manner.

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LUBRICATION DIAGRAM

•	PRESSURE OIL	•	SIPHON RETURN
		~TfM!~!f@	FILTER BY-PASS
P100B		Fig.1

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NEEDLES

Each needle has both a type and size number. Type number denotes the kind of shank, point, length, groove, fmish, and other details. Size number, stamped on the needle shank in metric, denotes largest diameter of blade, measured midway between shank and eye. Collectively, type and size number represent the complete symbol, which is given on the label of all needles packaged and sold by UNION SPECIAL CORPORATION.

The type numbers of the needles recommended for each Style of machine covered by this catitlog are given in the machine style description. Other needles are available, but the ones indicated are those recommended to produce the most satisfactory results. The type numbers of the recommended needles together with their descriptions, and the sizes available are listed below:

NEEDLE TYPE	DESCRIPTION	SIZES AVAILABLE
128 GAS	Round shank, round point, short, double	80/032,	90/036,
	groove, struck groove, ball eye, spotted,	100/040,	110/044,
	chromium plated.	125/049,	140/054,
		150/060,	170/067.
128 GBS	Round shank, round point, short, double	80/032,	90/036,
	groove, struck groove, ball eye, spotted, ball	100/040,	10/044,
	point, chromium plated.	125/049,	140/054,
		150/060.
192GLS	Round shank, round point, extra short, double	55/022,	65/025,
	groove, struck groove, ball eye, spotted	70/027,	75/029,
	(plated) thin ball point, chromium.	80/032,	90/036.

To have needle orders promptly and accurately filled, an empty package, a sample needle, or the Type and Size number should be forwarded. Use description on label. A complete order would read "1 000 needles, Type 128 GBS, Size 90/036".

NOTE: On earlier styles, machines equipped with a DURACOAT ALUMINUM needle bar, TORQUE needle bar connection screw, 16 to 18 in-lbs (18.4 to 20.7 ern/kg).

On later styles, machines equipped with a STEEL needle bar, TORQUE needle bar connection screw, 22 to 25 in-lbs (25.3 to 28.8 ern/kg).

TIIREAD MACHINE AS ILLUSTRATED.

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PIVOT GUARD

TO LEFT FOR

•

For ease of threading,

looper holder to the right.

CAUTION! Looper holder MUST ·be returned to extreme left and LOCKED by pulling release lever up before sewing.

TWO THREAD

A193A

THREADING DIAGRAM

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TIMING FEED TO NEEDLE

Adjustment would be required if the machine is feeding while the needles are in the work.

This can be accomplished by removing top cover, head cover, left cloth plate, and top feed chamber cover. Rotate handwheel in operating direction to position needle bar at bottom of stroke. At this time, the first screw (A, Fig. 2) in the feed drive eccentric (B) must be on the flat of the feed drive shaft and in a vertical position. Adjustment can be made by loosening two screws (A, Fig. 3) in upper mainshaft sprocket (B). Hold the handwheel fmnly with needle bar at bottom of stroke and rotate pulley as required to position screw (A, Fig. 2) so it is vertical. Torque screws (A, Fig. 3) to 55 in-lbs. (63 em/kg).

NOTE:, Whenever "TIMING FEED TO NEEDLE" is corrected, always check "SYNCHRONIZING LOOPER AND NEEDLE MOTIONS."

SYNCHRONIZING LOOPER

AND

NEEDLE MOTIONS

NOTE: End cover has been removed for clarity in Figure 4, but MUST BE IN POSITION WHILE

MAKING THE FOLLOWING ADJUSTMENTS. ,

Looper drive belt, (A, Fig. 4) has proper tension if, when turning handwheel in operating direction to position looper in the center of its (right to left) travel... .. there is no noticeable (right to left) play in the looper mechanism. There should be approximately 1/8 inch (3.2mm) deflection in looper drive belt when pressing fmnly with thumb, midway between sprockets (B and C). Adjustment can be made by loosening two screws (A, Fig. 5) and tum looper module (D, Fig. 4) counterclockwise to tighten belt or clockwise to loosen, as viewed in Figure 4. Retighten screws (A, Fig. 5).

To synchronize machine, remove needle bar eyelet guard, needle thread take-up cam wire, needles, presser foot, throat plate, loopers, and feed dog. Tum handwheel to position needle bar at BOTTOM of stroke and looper holder at EX1REME right end of travel.

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Fig.2

Fig.3

Fig.4

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Fig.S

Sketch A

Fig.6

SYNCHRONIZING LOOPER

AND

NEEDLE MOTIONS (Continued)

Using gauge No. 21227 AC, mount gauge plate with thro.at plate attaching screws. Insen pin (included with gauge) into looper holder. Mount indicator block to machine head

with one of the screws removed from needle bar eyelet guard. lnsen shank ofindicator gauge into indicator block and tighten screw against shank. (See Sketch A for reference).

NOTE: For Style LF612Kl01MBE use 21227 T mounting plate.

Rotate handwheel in OPERATING direction until the pin in looper holder contacts gauge plate. Loosen screw (A, Fig. 6) in needle bar connection (B) and position needle bar (C) as required to set the pointer of indicator gauge at "0" and tighten screw (A) VERY LIGH1LY.

IMPORTANT: Refer to NOTE, page 7 for proper TORQUE of screw.

Rotate handwheel in REVERSE direction until pin in looper holder again makes contact with gauge plate and note the reading on the gauge. A variation of (1) graduation on the scale is permissible. If the reading is above "0", loosen screws (E, Fig. 4) and tum rear looper drive sprocket (B) towards the operator (clockwise as viewed in Figure 4). If the reading is below "0", tum sprocket away from operator (counterclockwise as viewed in Figure 4). Temporarily snug screws.

Rotate handwheel in OPERATING direction until pin in looper holder contacts gauge plate and note the reading on scale. If the reading is above "0", loosen screws (E) and turn sprocket (B) away from operator (counterclockwise as viewed in Figure 4). If the reading is below "0", turn sprocket towards the operator (clockwise as viewed in Figure 4). Temporarily snug screws.

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SYNCHRONIZING LOOPER

AND

NEEDLE MOTIONS (Continued)

Continue to check and adjust in both OPERATING and REVERSE directions until pointer of indicator gauge comes within (1) graduation on the scale when turning the handwheel in either direction.

Before tightening screws (E) securely, be sure to have .002 inch (.051mm) clearance between sprocket (B) and needle guard drive connecting rod (F).

If a synchronizing gauge is not available.... turn the handwheel in operating direction to position right looper point even with the left side ofright needle and check the distance from the eye of needle to the bottom of looper blade.

Turn handwheel in reverse direction to position looper point even with the left side of RIGHT needle and check the distance from the eye of needle to the bottom of looper blade. If the distance was greater when handwheel was turned in operatirng direction, (as viewed in Sketch B) loosen screws (E, Fig. 4) and turn rear looper drive sprocket (B) away from operator (counterclockwise as viewed in Figure 4). If the distance was greater when handwheel was turned in reverse direction, (as viewed in Sketch C) tum sprocket towards the operator (clockwise as viewed in Figure 4). Temporarily snug screws.

Continue to check and adjust in both OPERATING and REVERSE directions until the distance from the eye of the RIGHT needle to the bottom of looper blade is the same in either direction, (as viewed in Sketch D).

Before tightening screws (E, fig. 4) securely, be sure to have .002 inch (.051mm) clearance between sprocket (B) and needle guard drive connecting rod (F).

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LOOPER IN t[§ FRONT OF

NEEDLE

~:EATEST _j

r

OPERATING

DIRECTION

A107

SketchB

LOOPER

BEHIND

NEEDLE

GREATEST

REVERSE

DIRECTION

A108

SketchC

For Proper SYNCHRONIZATION of

Looper & Needle

Dimensions will

-------
Looper
BEHIND
Needle
in		in
OPERATING		REVERSE
Direction		Direction

A 109

SketchD

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NEEDLE BAR ALIGNMENT

Insert a new set of needles. As a temporary setting, the TOP of needle bar (A, Fig. 7) should be approximately 1 7/8 inches (47.6mm) from the TOP of upper needle bar bushing when needle bar connection (B) is positioned at TOP of STROKE as shown in Figure 7. Adjustment can be made by loosening screw (C), reposition needle bar up or down as required and tighten screw (C) VERY LIGHTLY.

IMPORTANT: Refer to NOTE, page 7 for proper

TORQUE of screw.

Rotate handwheel to ensure that needles center in the needle holes of throat plate as shown in Figure 8. Adjustment can be made by loosening screw (C, Fig. 7) slightly, allowing needle bar to be rotated as required, while being careful to maintain the temporary height setting and tighten screw (C) AS SPECIFIED. An additional 4-way directional adjustment of the throat plate can be accomplished as follows:

Fig.8

IMPORTANT: Adjustmentofthroatplatemustbecoordinated between needles and feed dog; refer to "FEED DOG SETTINGS". Loosen two screws (A, Fig. 8) in throat plate support (B). Loosen two screws (C) which secure locating ferrules, allowing the throat plate support to be repositioned slightly. Tighten screws (C) first, then screws (A).

Fig.9

CAUTION! DO NOT wedge or pry with any type of tool, as damage to needle bar may result.

LOOPER SETTINGS

If not previously done, insert a new set of needles; type and size specified. With looper holder at EXTREME right end of travel, distance from centerline of RIGHT needle to point of RIGHT looper should be dimension (A, Fig. 9); see chart. Adjustment can be made by pulling release lever

(B) down and loosening screw (A, Fig. 10) in stop collar

(B). Apply pressure against the upper portion of looper

Fig.lO

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LOOPER SETTINGS (Continued)

holder (C) to the LEFf while turning screw (D) in looper holder clockwise to increase looper gauge or counterclockwise to decrease. Applicable looper gauge can be used advantageously in making this adjustment Continue to apply pressure against upper portion of looper to the LEFf while turning stop collar (B) to its EXTREME CLOCKWISE position and tighten screw (A) securely. Push up release lever

(E) to lock looper holder in position. Adjust screw (C, Fig. 9) which incorporates a spring plunger, against the recess in cam of stop collar as required to attain the following conditions:

Pull release lever down and be able to push looper holder to the right, with a snapping motion (making loopers easily accessible for threading). Push looper holder to the left, with a snapping motion. Apply pressure against upper portion of looper holder to the LEFf and push release lever up to lock looper holder in operating position.

In locked position, the release lever should be approximately in line with middle looper as viewed from the right side of looper holder. Adjustment can be made by loosening screw (D, Fig. 9), reposition release lever as required and retighten screw.

Loopers must also be set so, as they travel to the left behind the needles, NOT to touch, but with a MAXIMUM clearance of .002 inch (.051mm). Adjustment can be made by pulling release lever down, loosening screw (A, Fig. 10) in stop collar (B) allowing looper holder to be moved forward or rearward on its shaft, as required. Apply pressure against upper portion of looper holder to the LEFf while turning stop collar (B) to its EXTREME CLOCKWISE position and tighten screw (A) securely and push release lever up in locking position. RECHECK looper gauge.

MACHINE STYLE	DIMENSION A FIG. 9	LOOPER GAUGE NO.
LF612K100HB-1	5/32 inch (4.0mm)	21225-5/32
LF612KlOOHC-1	5/32 inch (4.0mm)	21225-5/32
LF612K100HJ-16	5/32 inch (4.0mm)	21225-5/32
LF612K100HJ-18	5/32 inch (4.0mm)	21225-5/32
LF612K112HJ-16	5/32 inch (4.0mm)	21225-5/32
LF612K112HJ-18	5/32 inch (4.0mm)	21225-5/32
LF612K100HR-18	5/32 inch (4.0mm)	21225-5/32
LF612K100MP-12	1/8 inch (3.2mm)	21225-1/8
LF612K100MP-16	1/8 inch (3.2mm)	21225-1/8
LF612K100MX-24	1/8 inch (3.2mm)	21225-1/8
LF612K101MBE-16	1/8 inch (3.2mm)	21225-1/8
LF613K100HJ-8	5/32 inch (4.0mm)	21225-5/32
LF613K100HJ-9	5/32 inch (4.0mm)	21225-5/32
LF613K100HR-8	5/32 inch (4.0mm)	21225-5/32
LF613K100HR-9	5/32 inch (4.0mm)	21225-5/32
LF613K101HR-8	5/32 inch (4.0mm)	21225-5/32
LF613K101HR-9	5/32 inch (4.0mm)	21225-5/32
LF613K112HR-8	5/32 inch (4.0mm)	21225-5/32
LF613Kll2HR-9	5/32 inch (4.0mm)	21225-5/32

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Fig.ll

Fig.12

Fig.13

NEEDLE BAR HEIGHT

Turn handwheel in operating direction until POINT of RIGHT looper (A, Fig. 11) is even with the LEFT side of RIGHT needle (B). TOP of needle eye should be l/64 inch (.4mm) below the undersurface of looper blade, as shown in Figure 11. Adjustment can be made by loosening screw (A, Fig. 12) and move needle bar (B) up or down as required. TORQUE screw (A).

IMPORTANT: Refer to NOTE, page 7 for proper TORQUE of screw. Care must be taken not to disturb ALIGNMENT of needle bar while making this adjustment.

NOTE: DO NOT wedge with any type of tool, as damage to needle bar may result.

LOOPER AVOID

Machine is equipped with a quick adjustable looper avoid mechanism to accommodate extreme differences in needle sizes. As the looper travles from left to right with needle bar descending, the needle points should contact ONLY the lower THIRD of the back of looper blades. If looper avoid requires re-setting, loosen two screws (A, Fig. 13) and turn eccentric stud (B) towards the plus side (counterclockwise) for MORE looper avoid or towards the minus side (clockwise) for LESS looper avoid. When

desired setting is acquired, tighten screws (A).

NOTE: Whenever looper avoid is changed, always recheck "LOOPER SETTINGS".

REAR NEEDLE GUARD TIMING

AND ADJUSTMENT

Rotate handwheel in operating direction to position looper points at the RIGHT hand side of needles. At this time the needle guard (C, Fig. 13) should be at its EXTREME END of FORWARD travel. Adjustment can be made by loosening two screws (A, Fig. 14) and turn needle guard eccentric (B) slightly as required until this condition exists. Ensure .002 inch (.05lmm) clearance between needle guard eccentric (B) and looper drive sprocket (C) while tightening screws (A) securely.

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REAR NEEDLE GUARD TIMING

AND

ADJUSTMENT(Continued)

At extreme forward end of travel, rear needle guard (C, Fig. 13) must be set horizontally not to contact needles (D) with a MAXIMUM clearance of .002 inch (.05lmm). Guard should be set as low as possible, yet have its vertical face approach approximately 3/64 inch (1.2mm) of needle points until point of loopers moving to the left, are even with the right side of needles. Adjustment can be made by loosening screw (E), reposition needle guard as required and retighten screw.

Ifadditional front to rear adjustment is required to maintain needle guard in a horizontal position, loosen screw (D, Fig. 14) in pivot link which allows needle guard shaft to be rotated. Be sure to take up thrust, by exerting pressure against needle guard holder to the left and pivot link to the right, when tightening screw (D).

NOTE: Change in stitch length WILL NOT require change in needle guard setting, but a change of needle SIZE, may.

FEED DOG SETTINGS

Feed dog should be centered in throat plate with equal clearance on both sides and ends. Feed dog should be level with and parallel to the top of throat plate as it begins to rise. At highest point of travel, feed dog teeth should extend the depth of a full tooth, or approximately 3/64 inch (1.2mm) above throat plate. MINOR (right to left) adjustments can' be made by loosening two screws (A, Fig. 15) in throat plate support (B). Loosen two screws (C) securing two locating ferrules which allow movement to align throat plate support. Reposition slightly as required, considering both needle hole slots and feed dog slots. Tighten screws (C) first, then screws (A). Front to rear adjustment can be made by turning stitch regulating knob (A, Fig. 16) counterclockwise to obtain LONGEST stitch length. Remove rear feed chamber cover which is secured with four screws.

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Fig.14

Fig.15

Fig.16

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FEED DOG SETTINGS (Continued)

Loosen Allen screw (A, Fig. 17) and turn eccentric (B) while rotating handwheel in operating direction to obtain equal clearance in throat plate, front and rear. Tighten screw (A) securely.

Feed dog can be leveled or tilted by loosening screw (A, Fig. 18) and rotate feed rocker tilting shaft (A, Fig. 19) slightly as required. Punch mark on shaft must be facing operator. Check parallelism of feed dog by placing throat plate in position. Before tightening screw (A, Fig. 18), make sure to have approximately .002 inch (.051mm) clearance between feed rocker (B) and spacer sleeve (C).

IMPORTANT: Recheck front to rear clearance of feed dog in throat plate slots whenever feed rocker tilting shaft has been repositioned. Replace rear feed chamber cover.

With feed travel set to desired stitch length, set feed dog height as specified by loosening mounting screw (D, Fig. 15) to position as required. Feed dog supporting screw is located in the feed dog holder, adjust as required to support feed dog before tightening screw (D).

Fig.18

CHANGING STITCH LENGTH

Stitch length is changed by turning stitch regulating knob (A, Fig. 16) clockwise to shorten the stitch or counterclockwise to lengthen the stitch. Recheck front to rear clearance under "FEED DOG SETTINGS" whenever stitch length is changed. Stop collar (B, Fig. 19) at rear of machine attached to stitch regulating knob shaft can be set to prevent stitch length regulating knob (A,' Fig. 16) from accidentally being turned beyond the desired stitch length.

Fig.19

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PRESSER BAR AND PRESSER FOOT

With needle bar at bottom of stroke and presser foot resting squarely on throat plate, there should be a minimum clearance of 1/64 inch (.4mm) between the bottom of screw (A, Fig. 20) and bottom of slot in presser bar guide plate (B). At this time, there should be at LEAST 1132 inch (.8mm) clearance between bottom of presser bar guide and top of lower presser bar bushing. There should also be 1/16 inch (1.6mm) clearance between bottom of slot in lifter lever link (C) and bottom of presser bar guide (D) when foot lifter lever is released. 1f adjustment is required, proceed as

follows:

Back off presser bar spring regulator to release tension on spring. Loosen two screws (E) in presser bar guide (D). Loosen nut (F) and turn screw (A) down against guide plate (B) to obtain at least 5/64 inch (2.0mm) clearance between bottom of presser bar guide (D) and guide plate

(B). Align presser foot with needles and press down FIRMLY while tightening two screws (E) in presser bar guide (D).

NOTE: This setting was necessary to prevent damage
to the scraper edge of presser bar bushing,
should presser foot be removed from machine.
	1/16"
	(1.6mml
Turn presser bar spring regulator down. Back off screw
(A) to obtain 1/64 inch (.4mm) dimension between bottom
of screw and bottom of slot in presser bar guide plate (B),
lock nut (F).
Loosen screw (G) in lifter arm (H) and rotate arm slightly
as required to obtain the 1/16 inch (1.6mm) dimension
between link (C) and guide (D), retighten screw (G)
ensuring no left to right shake in lifter arm (H).
Adjust presser bar spring regulator so it exerts only
enough pressure on presser foot to feed the work uniform-
ly. Turning it clockwise increases the pressure,
counterclockwise acts the reverse.
LOOPER THREAD TAKE-UP AND CAST-OFF
PLATE
Looper thread take-up (A, Fig. 21) must be centered front
to back in cast-off plate (B). It should also be positioned
so as the needle bar is descending, the looper threads are
"cast-off' the highest lobe of looper thread take-up when
the point of the left needle is even with the bottom of its
looper blade.		Fig.21
17

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LOOPER THREAD TAKE-UP AND CAST-OFF PLATE (Continued)

If adjustment is required, lift cast-off plate up. Loosen screw (A, Fig. 22) in positioning collar (B) and two screws (C) in looper thread take-up. Advance or retard take-up as required. Tighten two screws (C) securely in take-up making sure it is centered in cast~off plate. Positioning collar (B), which has a slot in its face, must be aligned with two screws which secure the discs of take-up together while THRUSTING positioning collar forward against take-up. Remove the play between screw heads in take-up and slot in positioning

collar by applying pressure on the collar CLOCKWISE while tightening screw (A) securely. Cast-off plate (B, Fig. 21) should be positioned horizontally. Which can be adjusted by repositioning latch (C). Set adjustable eyelets

(D) in the center of their mounting screws. More or less, looper thread can be supplied in the stitch by moving adjustable eyelets to the right or left respectively.

If retaining finger is rubbing take-up, loosen screw (E), center the fmger (F) and retighten screw. If retaining finger is on an angle, loosen screw (G), turn retaining finger support (H) slightly as required and retighten screw. The height ofretaining finger can be adjusted by loosening

screw (J), set to required height and tighten screw securely.

Fig.22

THREAD TENSION RELEASE

Needle thread tension assemblies (A, Fig. 23) are set correctly when the tension discs (B) start to release as the presser foot is raised to within 1/8 inch (3.2mm) of the end of its travel and completely released when presser foot has reached its highest position.

Adjustment can be made by removing plastic plugs (C), and loosening screws (D) and lower tension assemblies

(A) to advance the release action or raise tension assemblies to retard the release action. Hold tension assemblies in position while retightening screws (D).

Reassemble plastic plugs securely.

Fig.23

Loosen lock nut (A, Fig. 24) and adjust screw (B) in presser foot lifter lever, allowing presser foot to be raised to its highest position without interfering with needle head. Lock nut (A) securely.

	THREAD CONTROL SETTINGS
	Needle bar eyelet (A, Fig. 25) should be set with its eyelets
	1/16 inch (1.6mm) below strike-off (B) on needle thread
	take-up cam wire (C), as shown in Figure 25, with needle
	bar at BOTTOM of stroke.
	Adjustments can be made by bringing needle bar up,
	loosen screw (D) slightly, bring needle bar down to BOT-
Fig.24	TOM of stroke, reposition eyelet (A) as required and
	18

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THREAD CONTROL SETTINGS (Continued)

bring needle bar back up. Torque screw (D) to 10 in-lbs (11.5 em/kg).

Needle thread take-up cam wire (C) should be set to barely contact needle threads with needle bar at top of stroke. Adjustment can be made by loosening cam mounting screw (E), reposition cam forward or rearward as required and retighten screw . Auxiliary strike-off (F) should be set so needle threads contact strike-off when needle bar is at BOTTOM of stroke with Thread Control Assembly

adjustable eyelet (C, Fig. 26) set at "T". Loosen secrew

(A) and position strike-off (B) as specified and retighten screw. Thread tension on needle thread should be just enough to pull up uniform stitches. Thread tension applied on looper thread should be just enough to steady thread.

		POWER "AIR-KLIPP" CHAIN CUTTER
		ADJUSTMENTS
	Fig.26	Upper knife (A, Fig. 27) can be replaced by removing two
		screws (B). To replace lower knife, the upper knife must
		be removed and rear suction tube cover. Loosen two
		screws (C) and slide housing (D) towards the rear.
		Remove throat plate support with throat plate attached.
		Remove screw (A, Fig. 28) and lift up thread inlet (B).
		Unhook knife spring (E, Fig. 27) and remove lower knife
		(F). Reassemble knives in reverse manner. Reassemble
		thread inlet (B, Fig. 28) and slide housing (D, Fig. 27)
		forward against rear of throat plate; tighten two screws
		(C).

Fig.27

Fig.28

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1/32"

(.8mm)

(//)

PUSH

HERE

TO STALL

KNIFE

0

A130

KNIFE CROSS OVER

SHEAR ANGLE

A 131A

SHEAR ANGLE

Fig.29

SETIING KNIFE CROSS OVER

Adjustment may be necessary after replacing or repairing knives. With sewing motor switch in "OFF" position and air lines connected to air motor, depress treadle until air motor begins to operate, in and out.

IMPORTANT: Be sure that lower knife does NOT strike against knife housing or feed chamber cover. Adjustment should be accomplished by loosening two screws (G, Fig. 27) and reposition air motor

(H) left or right slightly, but under extreme circumstances it may become necessary to shorten the stroke oflower knife travel by repositioning coupling

(J).

Carefully press against lower knife (F, Fig. 27) until air motor stalls. With treadle still depressed, check the knife cross over. Cross over of lower knife to upper knife is positioned correctly when the lower knife is 1/32 inch (.8mm) from the front of upper knife as shown in Figure 27. If adjustment is required, loosen screw (K) and reposition coupling (J) as required to obtain specified dimension.

SHEAR ANGLE

Adjustment of shear angle can be made by loosening nut (A, Fig. 29) and turning screw (B) clockwise (a small amount at a time) while manually operating knife lever (C), continuously checking with a piece of thread to see if knives are cutting. As soon as the knives fail to cut thread and the shear angle is zero, turn screw (B) counterclockwise approximately 1/4 turn and lock with nut (A). Check cutting action of knives when air motor is operating.

CAUTION! Turning screw (B) clockwise to an EXTREME may cause damage to "AIRKLIPP" Chain Cutter assembly.

SETIING PRESSURE VALVES

Regulate valve on pneumatic control device for air motor of the "AIR-KLIPP" chain cutter to approximately 20-22 p.s.i. (1.5 bar) when air motor is operating. Regulate valve on pneumatic control device for the suction air to obtain maximum suction, yet so that the FABRIC TO BE SEWN will not be cut by the "AIR-KLIPP" chain cutter knives.

20

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PULLER TIMING
The Close-Coupled Roller Puller must be timed so the
intermittent feeding action stops BEFORE the needles are
entering the work. NOTE: This will depend on the thick-
ness of material and stitch length being sewn. If adjust-
ment is required, remove top cover which is secured with
four screws. Loosen four set screws (A, Fig. 30) in
sprocket (B). Advance or retard sprocket on shaft as
required. When proper timing is obtained, position
sprocket on its shaft (left or right) so drive belt is centered
in the puller drive assembly. Torque four screws (A) to
35 in-lbs. (40 em/kg). There should be approximately 1/8	Fig.30

inch (3.2mm) deflection in puller drive belt (A, Fig. 31) when pressing firmly between sprocket (B) and puller drive assembly. Adjustment can be made by loosening one screw (C) securing eccentric (D) and rotate eccentric counterclockwise as viewed in (Figure 31), to tighten belt, clockwise acts the reverse. Be sure to maintain .006-.010 inch (.150-.254mm) between eccentric and drive housing. Tighten screw (C) securely. When assembling top cover, care must be taken to center oil flow indicator in center of oil filler cap.

Fig.31

PULLER STITCH LENGTH
The feeding motion of the puller is achieved by two
sprockets. By using various combinations of nine dif-
ferent sprockets, (59) different puller stitch lengths can be
obtained. Refer tp sprocket charts on Page 23 that lists the
various sprocket combinations. NOTE: Actual stitch
length may vary slightly due to material being sewn.
When ordering sprockets use the appropriate dash number.
Example: C50042-Z-( ).
To change sprockets loosen two screws (A, Fig. 32) and
position screw to top of tension bracket to release tension
on stitch length drive belt. NOTE: Belt guard has been
removed for clarity. With drive belt in relaxed position,
sprocket (B and C) can be removed. When installing
sprockets (B and C) make sure that hub of sprocket is flush
with end of shaft and 1st screw in operating direction is on
the flat of shaft. Reassemble drive belt, tighten 2nd screw
in sprockets (B and C) securely. Rotate handwheel in	Fig.32
operating direction to make sure belt does not bind within
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PULLER STITCH LENGTH (Continued)

Fig.34

PULLER LIFT ADJUSTMENT

belt guard. It may be necessary to reposition sprockets (B and C) slightly (left and right). Pull down firmly on puller assembly, making sure puller roller is setting evenly on lower roller and tighten two screws (A) securely. The roller puller belt which is located under hinged belt guard

(D) should have 1/8 inch (3.2mm) deflection when pressing fmnly between drive shaft sprocket and drive sprocket. If adjustment is required loosen two allen screws (A, Fig. 33) and tum eccentric shaft (B) slightly to apply tension on belt. Turning shaft clockwise tightens belt, counterclockwise acts the reverse. CAUTION: Care must be taken not to disturb eccentric shaft (left or right). Tighten two screws (A) securely.

IDLER ROLLER

Puller Roller must be set evenly on Idler Roller (A, Fig. 34) to ensure that the material will be pulled straight through the sewing area. Adjustment for feeding can be made by shimming Idler Roller if necessary to achieve even mating. To shim roller remove one screw (B, Fig. 34) securing roller assembly. Remove Idler Roller Assembly and add shims as necessary between plate and bearing blocks to ensure mating between Puller Roller and Idler Roller.

With puller in the operating position and presser foot resting on throat plate there should be 1/32 inch (.8mm) between puller lifter link (A, Fig. 35) and puller lifting pin

(B). If adjustment is required loosen screw (C) in upper presser foot lifting shaft connection and raise or lower link

(A) as required. Tighten connection screw (C) securely..

NOTE: When presser foot starts to lift, puller must lift

at the same time.
For sewing operations not requiring puller action the
machine can be run with puller raised off the material by
turning the manual lock-up pin (D) up to position under
stop collar (E). If the puller has insufficient clearance to
clear material, stop collar (E) can be raised or lowered on
tension shaft (F) to suit. Adjust puller tension regulator
(G) so it exerts only enough pressure on puller to feed
work. Turning regulator clockwise to increase the pres-
sure, counterclockwise acts the reverse. If material does
not pull straight through behind presser foot tum stitch
regulator knob until material is straight.	Fig.35
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