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5.8 Adjusting differential feed dog
(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 differential
lever(left) below the graduation ③ .
When it is set at "S" , the ratio of main feed to
differential feed is 1 : 0.6.
(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
upper and lower limits between which the differential
lever(left) is moved up and down.
The range for the differential ratio differs depending on the
stitch length. Refer to Table 5.
Stitch length
Max. normal
( ㎜ )
differential
1.4
2.0
3.0
3.6
Table ５
Max. reverse
differential
1:1.6
1:0.6
1:1.6
1:0.6
1:1.5
1:0.6
1:1.2
1:0.6
①
③
Fig. 5-12
③
Fig. 5-13
19
5. Proper operation
gathering
streching
②
④
1:1.6
1:1
1:0.6
④
VFK2560-8
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