Browse Prior Art Database

Safety Switch with Spring Return for Protecting a Reciprocating Workpiece

IP.com Disclosure Number: IPCOM000090808D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Martin, VC: AUTHOR

Abstract

In drawing A workpiece 10 moves laterally in a reciprocating manner. The reciprocating action is achieved by use of motor 12, driving gear 14 via belt 16. The motor is controlled to rotatably drive gear 14 first in one direction and then the other. In each direction, gear 14 moves slightly less than a complete revolution. Shaft 18, attached to gear 14, drives wheel 20 which frictionally engages end drives belt 22. Belt 22 imparts the reciprocating motion to workpiece 10.

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Safety Switch with Spring Return for Protecting a Reciprocating Workpiece

In drawing A workpiece 10 moves laterally in a reciprocating manner. The reciprocating action is achieved by use of motor 12, driving gear 14 via belt 16. The motor is controlled to rotatably drive gear 14 first in one direction and then the other. In each direction, gear 14 moves slightly less than a complete revolution. Shaft 18, attached to gear 14, drives wheel 20 which frictionally engages end drives belt 22. Belt 22 imparts the reciprocating motion to workpiece 10.

In drawing B, the details of the safety controls are shown. Workpiece 10 in drawing A is not to be allowed to move too far in any given direction. Otherwise, the workpiece can be damaged. Normally, the end position of workpiece 10, before it reverses direction, is controlled by motor 12. However, if some malfunction occurs such that motor 12 drives workpiece 10 too far in a given direction. Then cam surface 24 or cam surface 26 actuates microswitch 28. The latter switches off electric power to motor 12. In drawing B, cam surface 24 actuates microswitch 28.

In order to avoid a condition where motor 12 is permanently held microswitch 28 being actuated, a rebound stop ring 30 is provided. Ring 30 is attached to shaft 18 via rubber ring 32. As a result, when gear 14 moves too far in one direction, ring 30 engages stop pin 34 and ring 32. Microswitch 28 is actuated to turn motor 12 off and the recoil, due to ring 32, moves gear...