−
28
−
(1)
(2)
(5)
(4)
(3)
(6)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(7)
(8)
3-27 Points of adjustment and assembly of the feed mechanism
(Adjusting the feed driving components)
*
To obtain the movement in the direction of the horizontal feed, feed rocker shaft (1) is rocked by means of feed
rocker cam attached to feed driving shaft (2), connecting links A (4) and B (3) of feed rocker rod (19), feed
adjusting link (5), and feed rocker arm (6).
*
Seizure, abnormal exothermic, pitch error, lever snarl, or defective return of lever will result due to the torque
of the sewing machine unless centering and play adjustment of the aforementiond parts are securly performed.
Perform readjustment in the following procedure when these phenomena are likely to occur.
1) Remove the lid of the gear box.
Refer to the item 3-34 for removing and attaching it.
2) Remove rubber cap (7) located on the side face of
the machine bed and loosen setscrew (8) in the feed
rocker arm.
*
Apply sealant to the rubber cap to prevent it from oil
blurredness when attaching it again.
3) Loosen two setscrews (13) in the feed rocker cam.
When attaching the setscrew No. 1 again, check that
it is set on the flat section.
When loosening amount of the setscrew No. 1 is
small, it can be saved for the setscrew to be slipped
from the flat section.
4) When there is no trouble with feed adjusting link (5),
the strain can be removed by adjusting the lateral
position of the feed rocker cam or the feed rocker
arm. Turn the handwheel several times and the feed
rocker cam moves to the position where there is no
strain. In this state, quietly tighten setscrew No. 1.
Further, tighten setscrew No. 2.
5) Then, similarly, turning the handwheel by hand, adjust
feed rocker arm (6) to the position where there is no
strain, and tighten the setscrew.
6) If there is a play when pressing feed adjusting link
(5) to the right and left, perform the following
adjustments before adjustments 4) and 5).
7) Remove rubber cap (9) in the adjusting link fulcrum
shaft and loosen setscrew (10) in the fulcrum shaft,
insert a screwdriver from the hole from which the
rubber cap is removed to lightly press the fulcrum
shaft, then securely tighten setscrew (10) in the
fulcrum shaft.
The play in this section will affect largely the lever
snarl. It is the point to assemble it while lightly pressing
the fulcrum shaft.
*
When the adjusting link does not smoothly move
although there is no lateral play in adjusting link
connecting link (14), remove rubber cap (11) in the
adjusting link fulcrum shaft, loosen setscrew (12) in
the fulcrum shaft on this side, move the feed lever up
and down to fit adjusting link (5), and adjust fulcrum
shaft (15) to the position where the strain does not
occur.
