Happy HCS-1201-30, Maintenance Manual

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Exchange of take-up lever cam
3-2-6
7. Remove take up lever cam.
8. Remove fasten collar.
9. Put good parts back in reverse order.
For adjustment of fixing of each unit, please refer to
process to adjust fixing of each unit.
<Important> Pay attention to following (1) - (4)
(1)Install upper shaft collar, upper pulley, drive pulley and
crank on flat surface of upper shaft with screw tightly.
(2)Make sure that pulleys and collars are attached
without space from machine body except upper
pulley.
(3)Position of upper pulley is [ 2mm ] from upper
shaft collar.
Upper pulley positioning gauge [ 2mm ]
(4)Confirm that belt is not interfere the pulley flange and
not come out from pulley groove.
Adjustment will be done with following pulley.
Timing belt has to be adjusted with upper pulley position.
Motor belt has to be adjusted with motor pulley position.
10. Please check and adjust the following timing to finish.
(1)upper shaft timing (L point, C point)
(2)Take-up lever timing
(3)Shuttle hook timing
(4)Thread cut timing