Browse Prior Art Database

Forms Burster

IP.com Disclosure Number: IPCOM000087328D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Mauroschadt, RR: AUTHOR [+3]

Abstract

Fig. A is a front elevation and Fig. B is a side elevation of an improved forms burster of the guided guillotine type. A frame casting 3 is supported in the document path and carries, in guide slots, a guillotine blade 5, the top portion of which engages the upper end of a solenoid plunger 7, and is retained in position by a cap 9. The blade is maintained in a raised inactive position by a return spring 11 and a permanent magnet 13.

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Forms Burster

Fig. A is a front elevation and Fig. B is a side elevation of an improved forms burster of the guided guillotine type. A frame casting 3 is supported in the document path and carries, in guide slots, a guillotine blade 5, the top portion of which engages the upper end of a solenoid plunger 7, and is retained in position by a cap 9. The blade is maintained in a raised inactive position by a return spring 11 and a permanent magnet 13.

When the solenoid coil 15 is energized, the plunger 7 moves downwardly against the retaining force of the magnet and the return spring. The magnet delays the motion of the plunger, allowing maximum current to be reached near the end of the solenoid plunger stroke, where bursting of the document takes place. The permanent magnet also aids in the return of the plunger to its normal position, allowing the use of a weaker return spring, and resulting in less resistance to the solenoid stroke and greater force at impact.

A document support bar 17 is held in its normal position by support springs 19, to support the document as it is burst. This prevents the document from being pushed down and binding in the opening provided in the document path as clearance for the burster blade.

Stops 21, one of which is provided on each side of the casting, engage projections on the blade to prevent the solenoid plunger from bottoming in the solenoid housing, thereby resulting in longer solenoid life.

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