Trigger device for box nailing machine and box nailing machine h

Details Trigger device for box nailing machine and box nailing machine h Trigger device for box nailing machine and box nailing machine h

1996-04-05

1998-06-30

Hail, III, Joseph J.

Elongated-member-driving apparatus

With control means responsive to sensed condition

Work-responsive

227 2, 227 8, 227130, B25C 106

Patent

active

057720967

ABSTRACT:
A box nailing machine includes a piston within a cylinder to drive a nail. A main selector valve introduces compressed air into the cylinder and discharges the compressed air from the cylinder. A start operation valve operates the main selector valve. A trigger device for the box nailing machine comprises: a trigger switch operated by a trigger lever; a contact switch operated by the contact arm; an electromagnetic valve serving as the start operation valve; a logical circuit for applying a drive current to the electromagnetic valve when both the trigger switch and the contact switch are turned on; and a controller which includes a timer with a predetermined time limit. The timer is started in accordance with a trigger signal of the trigger switch and prohibits the drive current from the electromagnetic valve when the timer counts the predetermined time period. The timer is reset upon release of the trigger.

REFERENCES:
patent: 3964659 (1976-06-01), Eiben et al.
patent: 4108345 (1978-08-01), Manganaro
patent: 4298072 (1981-11-01), Baker et al.
patent: 4405071 (1983-09-01), Austin
patent: 4500938 (1985-02-01), Dulin
patent: 4556803 (1985-12-01), Weigert
patent: 4679719 (1987-07-01), Kramer

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