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High Speed Straight Lockstitch Sewing Machine | Instruction Manual and Parts List
2.2
2.3
Machine
Specification
Motor, Motor
Pulley and V-Belt
Specifications
• ½ HP (400W) 2-pole (high speed) clutch motor
• M type v-belt
Singer
Model
Application Maximum
Speed
[spm]
Stitch
Length
[mm]
Height of
Presser Foot
by hand / by
knee [mm]
Needle
Bar
Stroke
[mm]
Hook
Type
Hook
Origin
Needle Cat. Lubrication Lubrication
Oil
191D-20
Light to
medium
5,000 5.0 5.5/13.0 30.7
Regular
Standard
1955-01 #14
Fully
Automatic
Lubrication
Singer “C”
type oil
191D-20C
Koban/
Hirose
191D-30
Medium to
heavy
4,500 5.0 5.5/13.0 35.0
Standard
1955-01 #18
191D-30C
Koban/
Hirose
191D-70
Heavy
3,000 7.0 5.5/13.0 35.0 Large
Standard
1955-01 #21
191D-70C
Koban/
Hirose
Machine Speed [spm] Motor Pulley Diameter [mm]
191C-20 / 20C 191C-30 / 30C 191C-70 / 70C 50 Hz 60 Hz
5,000 - - 125 105
4,500 4,500 - 115 95
- 4,000 - 100 85
- 3,500 - 90 75
- - 3,000 75 65
- - 2,500 65 55
Table 1 – Machine Specification
Table 2 – Machine Speed vs. Motor Pulley Diameter