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Incrementing Paper Feed Mechanism

IP.com Disclosure Number: IPCOM000079650D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 34K

Publishing Venue

IBM

Related People

Byram, JW: AUTHOR

Abstract

The figure illustrates an incrementing power drive mechanism or stepping mechanism, which utilizes a single coil spring as both a drive power source and as the bias and positioning force to maintain the pawl in contact with the ratchet. A single adjustment is required to vary the stroke length or incrementing distance of the mechanism, and the mechanism can be used to drive feed wheels or a take-up spool or the like. It is of a low-cost design and requires a minimum of parts. It has a long life, its highly dependable and of small size.

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Incrementing Paper Feed Mechanism

The figure illustrates an incrementing power drive mechanism or stepping mechanism, which utilizes a single coil spring as both a drive power source and as the bias and positioning force to maintain the pawl in contact with the ratchet. A single adjustment is required to vary the stroke length or incrementing distance of the mechanism, and the mechanism can be used to drive feed wheels or a take-up spool or the like. It is of a low-cost design and requires a minimum of parts. It has a long life, its highly dependable and of small size.

Output shaft 1 may be utilized to drive a friction wheel or take-up spool, for example, or to increment a rotary switch or the like whenever stepwise rotary motion is required, or when it is desired to drive paper, tape, or some similar substance in a linear manner by a gear wheel or friction wheel. Attached to output shaft 1 is a ratchet 2 having teeth spaced about its periphery for engagement with pawl 3. Rotation of ratchet 2 opposite to the direction imparted by the motion of pawl 3 is prevented by detent 4, which may be a simple strip of spring steel positioned on a part of housing 5 to be in contact with the teeth of ratchet 2.

An electrically energizable magnet is also attached to the housing 5 in a fixed position. It is provided with pole pieces 7 to serve the dual function of increasing the flux intensity in the vicinity of the armature 8, and to limit the maximum amount of armature travel to the right when the magnet is energized. A pivot 9 retains armature 8 with its base in proximity to one of the pole pieces and may be of any desired type. A simple notched or eared end armature inserted in a slot in mounting 10 affixed to housing 5 is preferred. The position of armature 8 when magnet 6 is energized is shown in dashed lines in the figure.

The upper end of armature 8 is pro...