US 5,012,912 AGranted

Safety interlock/latch assembly for a printing press

AssigneeRockwell International Corporation

InventorsHarold Sanderson, Larry J. Vande Walle

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Abstract

A safety interlock/latch assembly for use on a printing press having at least one safety latch (100) and one guard element (102). At least one lockable pivot device (106, 116) for allowing rotation of the guard element (102) is attached to a first end (104) of the guard element (102). A roller (112) for engaging the lockable pivot device (106, 116) is provided and has a cam (146) for switch actuation. A support device (132) for rotatably holding the roller (112) is provided and has an aperture (142) with a predetermined configuration for receiving the lockable pivot device (106, 116). The support device (132) is located at least between the lockable pivot device (106, 116) and the roller (112) and is attached to the printing press. A release latch (160) on the support device (132) holds the guard element (102) open and a spring latch (158) on the support device (132) holds the guard element (102 ) closed.

Claims20

Dependent claims

A safety interlock/latch assembly for use on a printing press comprising:

at least one means for switching having an actuator;
at least one interlock block having a socket for engaging a keyslot roller, said keyslot roller having at least first and second predetermined positions, said keyslot roller having at least a center aperture and a cross-channel on a first side thereof, said first side of said roller located adjacent a bottom wall of said socket in said interlock block, said interlock block having a keyslot in said bottom wall of said socket, said keyslot being in alignment with said cross-channel and center aperture of said keyslot roller when said keyslot roller is in said second predetermined position in said socket;
said keyslot roller having at least one cam for engaging said actuator of said means for switching, and when said keyslot roller is in said first predetermined position said cam engages said actuator causing said means for switching to be in a first switch state thereby allowing normal operation of the printing press, and when said keyslot roller is rotated to at least said second predetermined position, different from said first predetermined position, said cam is disengaged from said actuator causing said means for switching to be in a second switch state;
and
at least one guard element in said printing press having at least a first end with a first shaft having a first end for engaging said center aperture of said keyslot roller through said keyslot in said interlock block, said first end of said first shaft having a hole for receiving a cross pin, said cross pin being in alignment with said keyslot and being in alignment with said cross-channel only when said keyslot roller is in said second predetermined position, said cross pin being received in said cross-channel of said keyslot roller when said shaft engages said center aperture of said keyslot roller;
wherein, when said guard element is removable from or insertable into said interlock block because said keyslot roller is in said second predetermined position and said means for switching is in said second switch state operation of the printing press is limited.

3 more elements

A safety interlock/latch assembly for use on a printing press, comprising:

at least one guard element in said printing press;
at least one lockable pivot means for causing rotation of said guard element, said lockable pivot means attached to a first end of said guard element;
keyslot roller means for engaging said lockable pivot means, said keyslot roller means having a means for switch actuation;
support means for rotatably holding said keyslot roller means, said support means having an aperture with a predetermined configuration for receiving said lockable pivot means, said support means located at least between said guard element and said keyslot roller means and attached to said printing press.

1 more element

A safety interlock/latch assembly comprising:

at least one means for switching having an actuator;
at least one guard element;
at least one lockable pivot means for causing rotation of said guard element, said lockable pivot means attached to a first end of said guard element;
keyslot roller means for engaging said lockable pivot means, said keyslot roller means having at least one cam for switch actuation;
support means for rotatably holding said keyslot roller means, said support means having an aperture with a predetermined configuration for receiving said lockable pivot means said support means located at least between said guard element and said keyslot roller means;
said lockable pivot means for causing rotation of said guard element having at least on said first end of said guard element a shaft having a first end, said first end of said shaft having a hole for receiving a cross pin;
said keyslot roller means for engaging said lockable pivot means having a center aperture for engaging said first shaft of said guard element and a cross channel on a first side of said keyslot roller means for engaging said cross pin, said cam of said keyslot roller means contacting an actuator of at least one means for switching when said keyslot roller means is in a first predetermined position.

4 more elements

Dependencies are inferred from the claim text.