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Spring Design for Eliminating High Stresses in Matrix Print Wires

IP.com Disclosure Number: IPCOM000080611D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Baumeister, HK: AUTHOR [+2]

Abstract

Fig. 1 illustrates one design of a wire matrix driver assembly in which an electromagnetic coil 1 is energized at all times, except when printing is to be effected. The electromagnet attracts an armature 2 which has the wire matrix print wire 3 attached to it. Armature 2 is carried on the end of a cantilever leaf spring 4 which is rigidly mounted in a support 5, and which comes into abutment with a variable-screw adjusted stop 6 when the armature 2 is attracted to the coil 1 as shown.

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Spring Design for Eliminating High Stresses in Matrix Print Wires

Fig. 1 illustrates one design of a wire matrix driver assembly in which an electromagnetic coil 1 is energized at all times, except when printing is to be effected. The electromagnet attracts an armature 2 which has the wire matrix print wire 3 attached to it. Armature 2 is carried on the end of a cantilever leaf spring 4 which is rigidly mounted in a support 5, and which comes into abutment with a variable-screw adjusted stop 6 when the armature 2 is attracted to the coil 1 as shown.

As can be seen, the angle of slope, alpha, depends upon the position of screw stop 6 relative to spring 4 and to the location of the face of coil 1 relative to armature 2. The same angle alpha is also induced at point 7 in wire 3, due to the fact that a fixed guide 8 maintains the remainder of wire 3 in a straight line. Flexure at point 7 in wire 3 due to repeated operation of the print wire driver can cause, and often does cause, failure in the print wire entailing unnecessarily frequent repair.

Fig. 2 illustrates an improved design which eliminates the deflection angle alpha and maintains print wire 3 in a straight line at all times. This is accomplished, as shown, by placing the variable-screw stop 6 on the opposite side of armature 2 relative to the fixed mounting 5. This results in changing the support structure of the spring 4 from a pure cantilever support to a modified cantilever-doubly supported beam, which v...