No.OO
From the library of: Superior Sewing MachineBE5150SOBOA& Supply LLC
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CONTENTS |
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I. GENERAL DESCRIPTION |
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l. |
Remarkable features |
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2. |
Specifications ......................................................................................................... |
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II. INSTALLATION AND OPERATION |
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l. |
Installation............................................................................................................... |
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2. |
Motor pulley and belt ....................................................................................... |
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3. |
Preparation for operation ................................................................................. |
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III. HOW TO OPERATE THE MACHINE |
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I. |
Lubrication.............................................................................................................. |
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2. |
Lubrication of the sewing hook ..................................................................... |
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3. |
Attaching the needles ....................................................................................... |
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4. |
Twist of thread ...................................................................................................... |
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5. |
Passing the needle thread ................................................................................. |
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6. |
Passing the bobbin thread ................................................................................. |
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7. |
Adjusting the thread tension ........................................................................... |
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8. |
Adjusting the stitch length .............................................................................. |
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9. |
Reverse feed (LH-515) ........................................................................................ |
I0 |
IV. HOW TO ADJUST THE MACHINE |
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l. |
Timing of the bobbin case opening motion ............................................. |
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2. |
Adjusting the bobbin case opening mechanism ....................................... |
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3. |
Movement of the needle and the sewing hook .......................................... |
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4. |
Adjusting the clearance between the needle and |
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the blade point of sewing hook ............................................................... |
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5. |
Detaching and attaching the sewing hook ................................................ |
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Adjusting the height of feed dog .................................................................. |
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7. |
Adjusting the needle bar frame ..................................................................... |
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Adjusting the maximum stitch length (LH-515) ....................................... |
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9. |
Replacing the timing belt ................................................................................. |
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10. Adjusting the position of the timing belt ................................................... |
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V. HOW TO OBTAIN IDEAL SEWING CONDITIONS |
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Standard sewing conditions .................................................................................... |
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Troubles and corrective measures ........................................................................ |
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From the library of: Superior Sewing Machine & Supply LLC
I. GENERAL DESCRIPTION
JUKI Model LH-512 is a high speed, 2-needle, needle feed, lockstitch industrial sewing machine with a sewing speed of 4,200 s.p.m.
JUKI Model LH-515 is a high speed, 2-needle, needle feed, lockstitch industrial sewing machine equipped with reverse feed mechanism, which is designed for withstanding high speed operations up to the maximum sewing speed of 3,500 s.p.m. and for aiming at excellent durability.
1.REMARKABLE FEATURES o Link type thread take·up
This type of industrial sewing machine has usually been designed to be operated on the principle of a slide type thread take-up, although it was not sufficient in sewing speed and durability. By overcomming such technical problems, JUKI Model LH-515 has successfully been designed to employ the link type thread take-up mechanism which has sufficient durability without puckering the fabrics.
o Feed mechanism
This model employs a push button type lead cam regulating system and also needle bearings. For the purpose of preventing any abrasion or seizure during a high speed operation, a durable and seizure-free material is used for the slide block type feed driving mechanism.
oLubrication system
The lubricating oil y.rhich is fed from the oil reservoir by means of the plunger pump located on the hook driving shaft is distributed to the left and right hook driving shaft saddles, pushed up to the oil sight window on the machine arm and also is delivered to the thread take-up lever shaft. The inside mechanism of the face plate is constantly lubricated through the oil wicks connected to the thread take-up lever shaft.
All other bearing metals are made of special sintered alloy which does not need lubrication.
o Bobbin case opening mechanism
The bobbin case opening mechanism of the Model LH-515 is so designed as to achieve one motion while the sewing hook rotates twice, being different from the conventional models of which the mechanism achieves two motions. Thus, the improvement extends the life-time of the sewing hook and minimizes running noise.
oHook shaft bearings
High speed feature and durability of this model is assured by employing the precision needle bearings in the upper bushings of hook shafts on the both left and right.
-1-'-
From the library of: Superior Sewing Machine & Supply LLC
2. SPECIFICATIONS |
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LH·515 |
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Sewing type .......................... |
2-needle, lockstitch, needle feed, with reverse feed |
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mechanism (by feed control lever). |
Application ........................... |
Light and medium heavy weight materials. (Men's |
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shirts cuffs, front flies, attaching pockets to working |
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uniforms, felling trousers, attaching tapes to tricot |
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materials and sewing side face and waist inside of |
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men's jackets, etc.) |
Sewing speed ......................... |
Max. 3,500 s.p.m. |
Thread take-up ...................... |
Link type thread take-up |
Needle bar stroke .................. |
33.4mm ( 1-5/ 16") |
Needles ................................. |
DP x 7, No.I I, No.l4, No.l6 or |
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DP x 5, No.I I, No.l4, No.l6 |
Presser lifting amount ........... |
7mm(9/32") by hand lifter, 10mm(25/64") by knee |
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lifter. |
Feed mechanism ................... |
Bottom feed and needle feed. |
Stitch length ......................... |
Max. 4mm(5/32") |
Stitch length regulator .......... |
Feed eccentric adjustment system (by push button). |
Needle gauge ......................... |
3/3211 , 1/811 ,5/3211 , 3/16", 7/32", 1/4", 9/32", 5/16", |
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3/8", l/2", 5/8", 3/4", 7/8", I", 1-l/8", l-l/4", |
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1-3/8", 1-l/2'' |
Sewing hook ........................ |
Horizontally arranged automatic lubricating hooks for |
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high speed operation. |
Lubrication system .............. |
Automatic lubricating system by means of plunger |
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pump and lead pump. |
Driving motor ...................... |
3-phase 400W 0/2HP) clutch mtor. |
Table .................................. |
Table for model LH-5 l 5 |
LH-512 |
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Sewing type ........................ |
2-needle, needle feed, lockstitch |
Sewing speed ....................... |
Up to 4,200 s.p.m. |
(All other specifications are same as LH-515)
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From the library of: Superior Sewing Machine & Supply LLC
II. INSTALLATION AND OPERATION
1.INSTALLATION
The following procedure will simplify your installation works;
(1) |
Hinges |
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First of all, you must fix the machine head onto the table by means of |
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the accessory rubber hinges. |
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Make suitable recessions on the table using a round or straight chisel so that the |
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width and thickness of such rubber hinges tightly fit them and nail the hinges on |
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their positions with 2 pieces of nails. |
(2) |
Setting the oil reservoir |
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The oil reservoir must be set in the opening prepared on the table so that it is |
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supported by 4 corners thereon as shown in the illustration. |
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~ Hmark -~
Fig. 1
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1.Nail 4mm thick felts on the two corners of the near side of the table opening (operator's side).
2.Similarly, nail 6mm thick felts on the two corners of the far side (hinge side).
3.Place the oil reservoir on top of these felts.
4.Insert rubber cushions into 4 corners.
5.Put the round felts over the rubber
cushions.
(Note) Knee press rod bearing bracket CD should be installed as shown in the figure.
2.MOTOR PULLEY AND BELT
Use a 3-phase 400 W motor. The belt is M-type V belt.
Following tab!e shows the relationship between the number of rotation of the machine with the dimension of the motor pulley (effective diameter).
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Rotation |
Part No. of motor pulley |
Effective dia. |
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of machine |
of motor pulley |
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4,200 s.p.m. |
MTKPV 100000 · |
100 |
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4,000 s.p.m. |
MTK-P0095000 |
95 |
rp |
50 Hz |
3,800 s.p.m. |
MTK-PV090000 |
90 |
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3,400 s.p.m. |
MTK-PV080000 |
80 rp |
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3,000 s.p.m. |
MTK-PV070000 |
70 |
rp |
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From the library of: Superior-Sewing3- Machine & Supply LLC
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Rotation |
Part No. of motor pulley |
Effective dia. |
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of machine |
of motor pulley |
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4,200 s.p.m. |
MTK-PV085000 |
85 |
¢ |
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4, 000 s. p.m. |
MTK-P0080000 |
80 |
¢ |
60Hz |
3,800 s.p.m. |
MTK-PV075000 |
75 |
¢ |
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3,400 s.p.m. |
MTK-P0065000 |
65 |
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3,000 s.p.m. |
MTKPV060000 |
60 |
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(Note) For the first one month, operate the LH-512 machine with a speed of less than 3,800 s.p.m.
For LH-515, operate the machine with less than 3,000 s.p.m. In the meantime, the machine will warm up appropriately.
3.PREPARATION FOR OPERATION
(I)Fill the oil reservoir with lubricating
oil up to the level marked with "H", take an urethane foam sheet out of the accessory box and place it under the hook driving shaft saddles to absorb noise and dust.
(2)Those machines which are operated for the first time after setting up or after a long period of disuse, you
must apply 2 or 3 |
drops of oil |
Fig. 2 |
through the oil holes |
j) as shown in |
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Fig.2. |
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(3)Provide your machine with an idle run after pushing up the presser foot, and the lubricating oil will be circulated slowly to the oil gauge within 2 ~ 3 seconds.
(4)Precaution
o If you have to wait for 10 seconds or more until you observe the lubricating oil in the oil gauge, verify the following points:
(a)If the volume of oil is too short,
(b)If the plunger pump is normally running.
(If the plunger has not been aligned with the groove on the hook driving shaft, the lubricating oil will not be delivered pl·operly. In such a case, correct the position of the bushing on the hook driving shaft accordingly.)
o When the oil has reached the "L" mark of the oil reservoir, stop running the machine.
Be sure to verify that the oil is completely filled up to the "H" mark.
From the library of: Superior-4-Sewing Machine & Supply LLC
Ill. HOW TO OPERATE THE MACHINE
1. LUBRICATION
The amount of oil to lubricate the face plate mechanism has normally been adjusted at our factory before shipment. If necessary, you may adjust it by turning the adjusting screw shown in the Fig.3. The stable amount of oil is constantly supplied to . the face plate mechanism from the thread take-up lever shaft
through the oil wicks.
Fig. 3
Check the following points:
(I)2 oil wicks (3c/>) must be passed through the thread take-up lever shaft.
(2)The oil adjusting screw (Fig.3) located under the machine bed should have been screwed in by 3 or 4 turns.
(3)The tips of oil wicks sheathed with aluminium pipe are very slightly touching the surfaces of the needle crank rod and the needle bar.
(4)To check the amount of oil:
Hold a piece of rough paper facing to the mechanism as shown in Fig.4 so as to blot it with splashed oiL Run the machine for 5 seconds and then stop it for 5 seconds, repeat this intermittent test for 2 minutes and judge the amount of oil from the blot on the paper under the bright sunlight or artificial light. Fig.5 shows the optimum distribution of oil spots on the test paper.
(5)The lubricating oil must come up in the oil gauge within 3 seconds after the machine has been started to run.
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Fig. 4 |
Fig. 5 |
From the library of: Superior-Sewing5- Machine & Supply LLC
2.LUBRICATION TO THE SEWING HOOK
The amount of oil to lubricate the sewing hook is increased by tightening the adjusting screws <D in Fig.6 and decreased by loosening them.
3. ATTACHING THE NEEDLES
(I)DP x 5 or DP x 7 needles must be used for this model.
(2)Insert 2 needles fully into the needle clamp in such a manner as to make
their long grooves face with each other as shown in Fig. 7 and securely tighten with the clamp screws.
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Needle size |
Thread size |
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Sewing material |
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rT |
<f) |
<D |
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,,.J |
: ....., |
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Calico of light |
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,~ ..., |
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i•" |
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No.I I |
No.80 to No.lOO |
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weight, broad cloth |
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!'C |
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Y. |
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No.l4 |
No.60 to No.80 |
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Calico, Gabardine |
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of light weight |
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No.16 |
No.40 to No.60 |
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Woolen fabric, |
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Gabardine |
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No.l8 |
No.30 to No.20 |
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Vinyl-leather |
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Fig. 7 |
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4. TWIST OF THREADS (Fig.8) |
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We recommend |
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to use a S-twist (left twist) thread ® |
for the left needle and a |
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Z-twist thread (right |
twist) ® for the right needle. If not, |
loosely twisted threads or |
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thicker threads than No.30 may be frequently broken at the left hand needle. Either twist of threads can be used for the bobbin thread.
®
Fig. 8
From the library of: Superior- 6 --Sewing Machine & Supply LLC
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