Browse Prior Art Database

Document Clamp on Transport Drum

IP.com Disclosure Number: IPCOM000087612D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Kirksey, JR: AUTHOR [+2]

Abstract

Figs. 1 and 2 provide a simple, low-cost clamping mechanism that may be electrically operated by remote means to clamp a variable thickness document, such as a passbook, to the moving transport drum in a printer.

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Document Clamp on Transport Drum

Figs. 1 and 2 provide a simple, low-cost clamping mechanism that may be electrically operated by remote means to clamp a variable thickness document, such as a passbook, to the moving transport drum in a printer.

In Fig. 1, a segment of the rotating drum in which the clamping mechanism is placed is shown. Drum 1 has an opening axially in which the clamp member 2 is inserted. Clamp member 2 is bonded to a magnetic shunt bar 3 which is biased in the downward or clamping position against drum 1 by the flat leaf spring 4 which is affixed to shunt bar 3 by screw 5 or similar means. Located radially away from the drum and clamp, by a distance sufficient to allow clearance for the clamp and for any document clamped under it, is a magnet bar 6 of magnetic material which may be magnetized by applying current through the electromagnetic windings 7. The magnet bar 6 is biased in an upward position by a coil spring 8 rigidly mounted to an external framework 9. The magnet bar 6 pivots about its pivot point 10. The end 13 of clamp 2 is utilized for clamping a document 14 to the surface of drum 1, as shown by the dashed lines.

In operation, drum 1 is caused to come to rest in a position that will allow the operation of the clamping device 2. The magnet bar 6 is held in the upper position by the return spring 8. When current is supplied to the magnet winding 7, the force is sufficient to overcome return spring 8 and allow the magnet bar 6 to pivot downward about pivot point 10. This reduces the air gap between the magnet bar and the clamp 2 with its magnetic shunt 3, and the forces acting on the clamp shunt piece 3 become sufficient to overcome the force of the leaf spring...