Pfaff Industrial 937, Adjustment Manual

Table of Contents

Contents ..................................................................................Page

 3

13

 Adjustment ........................................................................................................................... 5

13

.01 

Tools, gauges and other accessories  .................................................................................... 5

13

.02 Abbreviations ......................................................................................................................... 5

13

.03 

Explanation of symbols .......................................................................................................... 5

13

.04 

Checking and adjustment aid ................................................................................................. 6

13

.05 

Adjusting basic machine ........................................................................................................ 7

13

.05.01 

Compensation weight ............................................................................................................ 7

13

.05.02 

Needle in needle hole centre (in sewing direction) ................................................................ 8

13

.05.03 

Needle bar parallel guide ....................................................................................................... 9

13

.05.04 

Locking lever ........................................................................................................................ 10

13

.05.05 

Zero stitch and zigzag stitch scale ....................................................................................... 11

13

.05.06 

Needle in needle hole centre (crossways to sewing direction) ........................................... 12

13

.05.07 

Zigzag stitch width ............................................................................................................... 13

13

.05.08 

Zigzag stitch movement ...................................................................................................... 14

13

.05.09 

Needle hole symmetry ........................................................................................................ 15

13

.05.10 

Needle position adjusting lever ............................................................................................ 16

13

.05.11 

Thumb wheels for the top feed (in machines without -918/14) ........................................... 17

13

.05.12 

Differential zero setting (in machines without -918/14) ....................................................... 18

13

.05.13 

Top and bottom feed synchronous position (in machines with -918/14) ............................. 19

13

.05.14 

Position of the stitch length adjusting wheel (in machines without -918/14) ...................... 20

13

.05.15 

Position of the stitch length adjusting wheel (in machines with -918/14) ............................ 21

13

.05.16 

Bottom feed dog zero position (in machines without -918/14) ............................................ 22

13

.05.17 

Bottom feed dog zero position (in machines with -918/14) ................................................. 23

13

.05.18 

Top feed dog connecting rod ............................................................................................... 24

13

.05.19 

Top feed dog zero position .................................................................................................. 25

13

.05.20 

Torsion spring for the reverse-feed key (in machines without -918/14) ............................... 26

13

.05.21 

Torsion spring for the reverse-feed key (in machines with -918/14) .................................... 27

13

.05.22 

Torsion spring for the differential regulating shaft (in machines without -918/14) ............... 28

13

.05.23 

Torsion spring for the differential regulating shaft (in machines with -918/14) .................... 29

13

.05.24 

Bottom feed dog sliding movement .................................................................................... 30

13

.05.25 

Bottom feed dog lifting movement  .................................................................................... 31

13

.05.26 

Driving belt in the gear box .................................................................................................. 32

13

.05.27 

Hook bearing bracket  .......................................................................................................... 33

13

.05.28 

Hook lubrication ................................................................................................................... 34

13

.05.29 

Pre-calibrating the needle height ......................................................................................... 35

13

.05.30 

Needle bar rise, hook-to-needle clearance and lower bobbin position finger ...................... 36

13

.05.31 

Readjusting needle height ................................................................................................... 37