Pfaff 3114 User Manual

16. Changingf^the Number ol Stifches per Buttonhole
The neat appearance and durability of a buttonhole greatly depend on the
stitch density, i.e. the
proper relation of the length of buttonhole to 'the
number of stitches.
With the PFAFF 3114 feeding of the work is accomplished by means of the
gear-driven feed cam.
To obtain the proper rate of speed of tlie work clamp motion and, con
sequently, the proper number of stitches in relation to the length of button
hole chosen, the pinions marked 1 and 2 in photo 23 are either interchanged
or exchanged for pinions which produce the number of stitches desired.
The pinions required may be selected from the table below which is also
reproduced on the back cover of the feed gear housing.
Number of Sfitches
Length ot
Number of Stitches
Gears
Inch. mm Wide Medium Narrow
Medium
Narrow
1
2 1 2
1
2
V'/'
6.4 90 100 120 48 22 47
23
44 26
9,6 90 105 150 48 22 46 24
40
30
'/?"
12,7
100
125 180 47 23 43 27
37
33
Vs"
16,0
105
150
210
46 24 40
30 34 36
V/'
19,0 105
170 240 46
24
38 32
32
38
Vb"
22,2 105
190 270 46
24
36 34
30 40
1"
25.4
110
210
300
44 26
34
36
28
42
1'/^"
28,6 130
220 330 42
28
32
38 26
44
1'//'
31,7
140
250 360
41
29 31 39 25
45
IV,b"
33,3 160
270 390 39 31 30 - 40 24
46
1'/ib"
36.5 170 300 410
38 32 28 42 23
47
IV,b"
39,7 180 310
440 37 33 27
43
22
48
Driven pinion
Driving pinion
If J
24
From the library of: Superior Sewing Machine & Supply LLC

Pfaff 3114 Specifications

General

Brand	Pfaff
Model	3114
Category	Sewing Machine
Language	English