Adler 550-12-23, 550-12-24, 550-12-26 Service Manual

Contents page:

Part 3: Servicing Instructions 550-16-23 and 550-16-26

1. General .................................................... 3

1.1 Gauges .................................................... 4

1.2 Description of the integral adjustment disc ............................... 5

1.3 Position of the integral adjustment disc with respect to the arm-shaft crank ........... 6

2. Upper/lower synchronous-belt shafts................................. 7

2.1 Position of the synchronous-belt pulley on the lower shaft ...................... 7

2.2 Upper/lower shaft synchronous-belt tension .............................. 8

3. Needle-bar height ............................................. 9

4. Shuttle .................................................... 10

4.1 Aligning the shuttle shaft .......................................... 10

4.2 Changing the shuttle-drive synchronous belt .............................. 12

4.3 Loop stroke and gap between shuttle tip and needle ......................... 13

4.4 Bobbin-housing holder ........................................... 14

5. Material feed................................................. 15

5.1 General .................................................... 15

5.2 Underfeed................................................... 17

5.2.1 Replacing the feed belts .......................................... 17

5.2.3 Feed-belt tension .............................................. 18

5.2.4 Replacing the drive belt .......................................... 19

5.3 Overfeed ................................................... 22

5.3.1 Feed belts: overview ............................................ 22

5.3.2 Changing the feed belts .......................................... 23

5.3.3 Tensioning the feed belts.......................................... 26

5.3.4 Drive-shaft play ............................................... 27

5.3.5 Changing the synchronous belt ...................................... 28

6. Sewing foot ................................................. 29

6.1 Height of the presser bar .......................................... 29

6.2 Sewing-foot lift ................................................ 30

6.3 Sewing-foot pressure ............................................ 31

6.4 Adjusting the sewing-foot stroke height ................................. 32

6.4.1 General .................................................... 32

6.4.2 Stroke timing ................................................. 32

6.4.3 Stroke height ................................................. 33

7. Thread cutter ................................................ 34

7.1 General .................................................... 34

7.2 Control cam for blade-movement timing ................................. 35

Contents page:

7.3 Cutter-blade position ............................................ 36

7.4 Counter-blade cut pressure ........................................ 37

8. Thread-guiding components ...................................... 38

8.1 Needle-thread tensioner .......................................... 38

8.2 Thread-tensioning spring.......................................... 39

8.3 Bobbin winder ................................................ 40

9. Proximity switch .............................................. 41

10. Lubrication ................................................. 42

10.1 Oil circulation................................................. 43

11. Maintenance ................................................. 44

1. General

These Servicing Instructions describe the adjustment of the 550-16-23 and 550-16-26functional sewing units.

CAUTION:

The activities described in these Servicing Instructions may only be carried out by specialist personnel or other appropriately trained persons.

Caution: danger of injury

Before all repair, conversion and maintenance work turn off the main switch and isolate the machine from the pneumatic supply.

When carrying out adjustment work and function-testing with the machine running, comply with all safety measures and take the utmost care.

These Servicing Instructions describe the adjustment of the sewing machine in a logical order. It must be borne in mind that various adjustments are mutually dependent. The adjustment process must therefore be carried out in the order given.

For all adjustments of stitch-forming components a flawless new needle must be fitted.

NB:

On the 550-16-23/-26 functional sewing units some shafts have flattened areas to simplify the adjustment of the machine.

In all adjustments using these flat areas the first screw in the direction of rotation is placed on the flat area.

CAUTION:

All colour-marked components are factory-set. These settings should not be altered except by specialists.

1.1 Gauges

The machine can be precisely adjusted and checked with the gauges listed below.

The locking pin 1, which can be found in the machine’s accessory pack, is used to lock the arm shaft in the various positions required for adjustment.

Position Gauge Order-No. Use

1 Adjusting pin 9301 022 608 lock machine in positions A-F 2 Gauge 6279 290 120 align the shuttle shaft in the

shuttle column

3 Measuring pin 6279 290 010 adjust needle-bar height

1.2 Description of the integral adjusting disc

The machine can be locked in all adjustment positions using locking pin 2 and the adjustment disc 3 integral to the synchronous-belt pulley on the arm shaft.

There are 6 notches on the adjustment disc. These are marked A, B, C, D, E and F on the hand-wheel 1.

Notch A (loop-stroke position) is deeper than the others. The adjustment positions are as follows:

2 3

A: adjustment disc with respect to the groove in the arm-shaft

crank, loop stroke, gap between the shuttle tip and needle

C: control cam for thread cutter B, D, E, F: vacant

1.3 Position of the integral adjustment disc with respect to the arm shaft

321

CAUTION:

Adjustments carried out with the adjusting disc will only be correct if the disc itself has been adjusted as described below.

If the arm shaft is moved, all subsequent settings must be checked and adjusted if necessary.

Caution: danger of injury

Turn off the main switch. The position of the adjustment disc may only be checked and adjusted with the machine switched off.

Regulation and inspection

Groove 4 and notch A of the adjustment disc integral to the synchronous-belt pulley must coincide on the X-Yline.

–

Lock the arm shaft with a locking pin ora5mmØpininthe arm-shaft groove 4 (through hole 3).@BLICKFANG-STR = With the integral adjusting disc in position A it must be possible to pass the locking pin through the hole 1.

Adjustment

–

Remove the bobbin-winder cover 2.

–

Insert the Allen key 5 in the hole to undo the screws of the belt pulley 6 from above.

–

Lock the belt pulley in position A with the locking pin.

–

Insert a 5 mm-thick pin into the rig hole 3 and allow it to engage in the arm-shaft groove 4.

–

Tighten the screws on the belt pulley 6. The belt pulley must not be axially shifted.

–

Replace the bobbin-winder cover 2.

6 5

2. Upper/lower synchronous-belt shafts

2.1 Position of the synchronous-belt pulley on the lower shaft

321

Caution: danger of injury

Turn off the main switch. The position of the lower belt pulley may only be inspected and

adjusted with the machine switched off.

Regulation and inspection

The first screw of the belt pulley 2 must bite on the flat area of the lower shaft 1. The lateral position of the belt pulley must be such that the belt runs centrally to the upper belt pulley.

Adjusting the setting

–

Fold the machine back.

–

Undo the screws on the lower belt pulley.

–

Align the belt pulley laterally to the upper belt pulley.

–

Tighten the screws on the belt pulley.

–

Turn the hand-wheel and check that the belt is properly seated on the upper belt pulley.

2.2 Upper/lower shaft synchronous-belt tension

Regulation and inspection

The tension in the belt should be such as to produce an exact transmission between the upper and lower shafts. Excessive belt tension may lead to disproportionate wear and noise.

Caution: danger of injury

Turn off the main switch. The belt tension may only be checked and adjusted with the machine

switched off.

Correcting the belt tension

–

Remove the bobbin-winder cover.

–

Remove plastic bungs 1 and 2.

–

Undo screw 3.

–

Twist the belt tensioner 4 as required.

–

Retighten screw 3.

–

Replace plastic bungs 1 and 2.

–

Replace the bobbin-winder cover.

CAUTION: danger of breakage

After adjusting the belt tension, check the shuttle setting.

3. Needle-bar height

321

Caution: danger of injury

Turn off the main switch. The needle-bar height may only be checked and adjusted with the

machine switched off.

Regulation and inspection In the loop-stroke position (adjustment position A) the shuttle tip 7

3mm

must be at the centre of the needle 8 and 3 mm above the upper edge 6 of the eye of the needle. The setting is checked with adjusting pin 4.

– – – – –

Undo screw 3. Remove the needle from the needle bar 2. Push adjusting pin 4 into the needle bar as far as it will go. Tighten screw 3. Lock the machine in adjustment position A.

The foot of adjusting pin 4 must be in contact with the needle plate.

Adjustment

–

Unscrew the cover.

–

Undo screw 1.

–

Raise or lower the needle bar until the foot of adjusting pin 4 makes contact with the needle plate.

Caution:

Do not twist the needle bar when moving it.

–

Tighten screw 1.

–

Replace and screw down the cover.

Having the needle bar at the wrong height may cause: –

damage to the shuttle tip

–

the shuttle thread to jam between the needle and the needle guard

–

faulty stitches and thread damage.

4. Shuttle

4.1 Aligning the shuttle shaft

Caution: danger of injury

Turn off the main switch. The shuttle shaft may only be adjusted with the machine switched off.

Regulation and inspection

The shuttle shaft 1 is factory-aligned. When it is correctly aligned the shuttle 3 is equidistant from the shuttle-drive housing 2 at every point.

Adjustment

–

Undo screw 5.

–

Remove support 4.

876

–

Undo screw 7.

–

Remove the left and right casings 6 and 8.

–

Remove screws 10 and 12.

–

Remove the centre-holder 11 and needle plate 9.

–

Undo the shuttle screw 14 and extract the shuttle from the drive housing.

–

Remove the synchronous belt 13.

–

Undo screws 16. The shuttle support and shaft are loose.

–

Place the gauge 15 on the shaft.

–

Move the shaft laterally and vertically until the gauge 15 can be

14 13

pressed into the shuttle-drive housing.

–

Tighten screws 16.

CAUTION:

The shaft and drive wheel must move freely when rotated.

–

Remove the gauge 15.

–

Replace the belt 13.

–

Place the shuttle on the shaft, align and adjust (see section 4.3).

12 11 10 9

4.2 Changing the shuttle-drive synchronous belt

32 1

Caution: danger of injury

Switch the machine off. The belt may only be changed with the machine switched off.

Changing the belt

–

Remove screws 1 and 2 and cover 3.

–

Undo screw 5 on the sprocket 4.

–

Remove belt 9 from the shuttle shaft.

–

Push the lower belt pulley 7 with the shaft 6 to the right. The belt can be removed to the left.

–

Pass the new belt 9 down through slit 8 and place it on the lower belt pulley.

–

Push the lower belt pulley to the left and place shaft 6 against sprocket 4.

–

Tighten screw 5 of sprocket 4.

–

Place belt 9 on the shuttle-shaft sprocket.

–

Adjust the loop stroke (see section 4.3).

987 654

4.3 Loop stroke and gap between shuttle tip and needle

Regulation and inspection

The loop stroke is the path taken by the needle bar from bottom dead centre to the point at which the shuttle tip is at the centre of the needle. The loop stroke is 1.8 mm long.

With the machine locked in position A the shuttle tip 1 must be at the centre of the needle.

The gap between the shuttle tip 1 and the needle must be 0.1 mm.

Caution: danger of injury

Turn off the main switch. The loop stroke and the gap between the shuttle tip and needle may

only be checked and adjusted with the machine switched off.

Adjustment

–

Remove the sewing foot and needle plate. Fit a new needle.

–

Lock the machine in position A.

–

Undo the shuttle’s attaching screws 2.

–

Place the shuttle tip 1 at the centre of the needle. The gap between the shuttle tip 1 and the throat of the needle must be 0.1 mm.

–

Retighten the shuttle’s attaching screws 2.

–

Replace the sewing foot and needle plate.

4.4 Bobbin-housing holder

Caution: danger of injury

Turn off the main switch. The bobbin-housing holder may only be adjusted with the machine

switched off.

Regulation and inspection

The gap between the bobbin-housing holder 1 and the centre of the shuttle 2 must be at least equal to the thickness of the yarn so that the yarn can pass freely through it.

Adjustment

–

Undo screw 3.

–

Set pin 1 to the centre of the shuttle.

–

Retighten screw 3.

5. Material feed

5.1 General

The upper and lower belt feeds are driven by two separate step motors.

Step motor 1 for the lower belt feed is connected to the drive transmission with a slip clutch. Step motor 2 for the upper belt feed is directly connected to the feed belts.

Power is transmitted by synchronous belt to the upper and lower feeds (2 feed belts for each).

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