Hydraulically operated linear actuator and an electrical control

Details Hydraulically operated linear actuator and an electrical control Hydraulically operated linear actuator and an electrical control

1981-08-27

1984-11-20

Nerbun, Peter

Sewing

Special machines

Buttonhole

318601, 318604, 307269, 112 79A, D05C 1530

Patent

active

044832605

ABSTRACT:
A needle bar shifter for a textile tufting machine having an operating rod connected to the needle bar and extending into an hydraulic cylinder for manipulation by movement of a spool in a bore in the rod, the rod having passages to permit flow of hydraulic fluid from one side to the other of the end of the rod by opening of different passages by movement of the spool, which is manipulated by light hydraulic pressure independent of the high pressure needed for manipulation of the rod and needle bar. An electrical system for controlling manipulation of the spool includes a plug board for predesignating a pattern of individual sequential positions of the needle bar, which positions are indicated by electrical signals generated in response to scanning of the plug board and compared with signals indicating the preexisting position of the spool, with the system limiting the resultant control signal to a preset maximum magnitude so that the rod will be manipulated in steps to the predesignated position, and when no plug is present in a plug row being scanned the system will randomly select a signal to produce a resultant control signal, which is limited as aforesaid in magnitude. A split phase amplifier compares the magnitudes of the resultant control signal and a signal indicating the preexisting position of the spool to produce a polarity indication of the direction of needle bar movement to be effected and permitting individual gain control for each polarity.

REFERENCES:
patent: 3906324 (1975-09-01), Smith
patent: 4173192 (1979-11-01), Schmidt et al.
patent: 4290000 (1981-09-01), Sun
patent: 4388884 (1983-06-01), Hirota

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