Browse Prior Art Database

Forms Sensor for Automatic Platen

IP.com Disclosure Number: IPCOM000074517D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Carpenter, LZ: AUTHOR [+2]

Abstract

A platen 10 in a high-speed printer is automatically adjusted in accordance with the thickness of the forms by being moved longitudinally by a motor driven cam 12 as shown, so as to be cammed forward by inclined cam surfaces represented by the surface 14 which rides against a guide block 16. A sense arm 18 is pivotally mounted on the platen by a pivot 20 and is normally held in the position shown by a hold electromagnet 22. An adjustable screw 24 engages the forms 26 as the platen moves toward the forms which are backed by a plate 28.

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Forms Sensor for Automatic Platen

A platen 10 in a high-speed printer is automatically adjusted in accordance with the thickness of the forms by being moved longitudinally by a motor driven cam 12 as shown, so as to be cammed forward by inclined cam surfaces represented by the surface 14 which rides against a guide block 16. A sense arm 18 is pivotally mounted on the platen by a pivot 20 and is normally held in the position shown by a hold electromagnet 22. An adjustable screw 24 engages the forms 26 as the platen moves toward the forms which are backed by a plate
28.

After the forms have been compressed a certain amount, the sense arm will break away from the hold electromagnet 22 and in so doing will open air vent 30 to reduce the pressure from inlet source 32 applied to switch outlet 34. The switch, not shown, operates to interrupt the drive circuit of the motor driving the cam, with the platen in the proper operating position.

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