5. Proper operation
5.7 Adjusting differential feed dog
Fig. 5-8
Fig. 5-9
①
②
③
④
③
④
1:2
1:1.75
1:1.5
1:1.25
Table 6
(1) Normal differential feed (gathering)
Loosen the nut ① and move the differential lever(left)
② up or down to set it at the desired position. Tighten
the nut ① securely.
When the differential lever(left) is set at graduation
(Long) ③ , the ratio of main feed to differential feed is
1 : 1.
To obtain normal differential feed, raise the differential
lever(left) above the graduation ③ . The maximum ratio
of main feed to differential feed is 1 : 2.
(2) Reverse differential feed (stretching)
To obtain reverse differential feed, lower the differen-
tial lever(left) below the graduation ③ .
When it is set at “S” , the ratio of main feed to differ-
ential feed is 1 : 0.7.
(3) Adjustment of differential feed during operation
To adjust differential feed during operation, connect
the chain to the differential lever(left).
Fix Stop ④ (2pcs.) at the desired position to set up-
per and lower limits between which the differential
lever(left) is moved up and down.
☆ Table 6 shows the range of differential ratio depending
on the stitch length.
Stitch length
（㎜）
Max. normal
dierential
Max. reverse
dierential
3.6 1:1.2 1:0.7
2.5 1:1.6 1:0.7
2.0 1:1.8 1:0.7
1.4 1:2.0 1:0.7
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