Browse Prior Art Database

Type Element Detent Detection

IP.com Disclosure Number: IPCOM000048406D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Vitek, EJ: AUTHOR

Abstract

It is advantageous at times to be able to determine on an experimental basis the exact moment of print element-rotate detent contact. This moment of contact can be detected by using the element and its conductive metallic plating as a portion of the circuit and one element of a contact switch. By selectively removing the plating 10 on certain portions of the type element 12 in order to isolate the detenting teeth surfaces 14 from the remainder of the typewriter and connecting a conductor 16 into that portion of the element 12, a circuit as illustrated in Fig. 1 may be fashioned with the detent 20 and plated element surface 14 forming the contacts of the switch. Plating 10 may be removed strategically to isolate portions of the type element 12 electrically from other portions of the type element.

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Type Element Detent Detection

It is advantageous at times to be able to determine on an experimental basis the exact moment of print element-rotate detent contact. This moment of contact can be detected by using the element and its conductive metallic plating as a portion of the circuit and one element of a contact switch. By selectively removing the plating 10 on certain portions of the type element 12 in order to isolate the detenting teeth surfaces 14 from the remainder of the typewriter and connecting a conductor 16 into that portion of the element 12, a circuit as illustrated in Fig. 1 may be fashioned with the detent 20 and plated element surface 14 forming the contacts of the switch. Plating 10 may be removed strategically to isolate portions of the type element 12 electrically from other portions of the type element.

Circuit closure may be detected in varying degrees of complexity, ranging from a simple continuity test to an input for an oscilloscope. The applications of the circuit include detent timing and type element homing.

In detent timing, the exact point in a particular cycle where the detent member 20 contacts or withdraws from the element 12 may be detected electronically if the element 12 is plated such that the element teeth 14 are isolated from the remainder of the element surface. This may be accomplished by a removal of the plating 10 around the top portion of the type element 12 and around the interior of the type element, as illustrated in Fig. 1.

The type element homing check may be accomplished and homing verified dynamically in a manufacturing...