Donald J Norton

US Patent:

40832996, Apr 11, 1978

Filed:

Jan 24, 1977

Appl. No.:

5/761585

Inventors:

Donald C. Norton - Costa Mesa CA

Assignee:

C. Itoh Electronics, Inc. - Los Angeles CA

International Classification:

B41J 304

US Classification:

101 9303

Abstract:

There is disclosed an impact device for operation from a source of alternating power and with at least striking member adapted to be electromagnetically actuated to impact against an opposing surface. An electrical gate under the control of a switching circuit and at a given point in time and for a given time duration connects a source of alternating power to the electromagnetic striking member. A source of gate control pulses for rendering the electrical gate conductive and non-conductive is connected through the switching circuit under the direction of a switch control circuit to the electrical gate for selecting which of the gate control pulses are to be connected to the electrical gate. The source of gate control pulses generates a time sequence of pulses of a given time duration in synchronism with the source of alternating power and a phase shift circuit shifts the time relationship between the pulses and the waveform of the alternating power to control the point of activation of the striking member and thereby adjust the impact force of the striking member against the opposing surface. An electrical system is also disclosed for generating several or more sources of alternating power shifted in phase relative to one another to which a striking member may be selectively connected for increasing the number of times the striking member may be actuated during the time interval of one cycle of the source of alternating power.