Speed controller for controlling revolution speed of upper shaft

Details Speed controller for controlling revolution speed of upper shaft Speed controller for controlling revolution speed of upper shaft

1989-06-12

1990-11-06

Nerbun, Peter

Sewing

Elements

Starting or stopping

D05B 6916

Patent

active

049676784

ABSTRACT:
A speed controller for controlling revolution speed of the upper shaft of a cycle sewing machine comprises a first disk shaped stop lever adjustment cam that has a small diameter portion, middle diameter portions and a large diameter portion. The cam is rotatably driven by an upper shaft. The small diameter portion establishes a neutral position at which a first driving clutch for low speed rotation and a second driving clutch for high speed rotation are disengaged from each other. The middle portions establish a position at which the first clutch is connected to a first driving wheel for low speed rotation. The large diameter portion establishes a position at which the second clutch is connected to a second driving wheel for high speed rotation. A first end portion of the large diameter portion is defined by a second cam. The second cam is secured to the first cam by an adjustable device which can vary the circumferential position of the second cam.

REFERENCES:
patent: 3705561 (1972-12-01), Sakawa et al.
patent: 3908568 (1975-09-01), Fujii
patent: 4373461 (1983-02-01), Sano

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