Ncr Corporation

Axiohm Ipb Inc.

James W Lee

Phillip B Daley

Michael A Ditonto

Dale W Roddy

A mechanism is provided with a slide adjustment member that is mounted on a frame supporting a carriage assembly of a printer. The carriage assembly is pivotally mounted upon a support shaft carried by a frame. The slide adjustment member has indexing teeth that engage with a plurality of saw-tooth detents. The sawtooth detents are longitudinally disposed upon a surface that is at a slight angle in the range between 3 and 4 degrees, and preferably about 3.44 degrees with respect to the horizontal. Horizontal movement of the slide member over this angled surface causes the carriage assembly to pivot about the support shaft. In so pivoting, the printhead carried upon the carriage assembly is forced to move with respect to the platen, thus changing the paper thickness gap therebetween. Each indexed movement of the slide member past a detent tooth provides a change of 0.003 inches in the gap. This change is equivalent to the difference between single and double ply paper. Thus, the invention provides a simple, low cost slide member and sawtooth index surface for changing the paper gap between the printhead and platen.

Paper adjustment device for a printer

A print head carriage of an impact printer is monitored by means of a segmented timing member which is separate from but coupled to and movable in coordination with the carriage. The segmented timing member is associated with a carriage drive motor and preferably comprises a toothed wheel which is rotated by a motor drive gear also used to move the print head carriage. The teeth of the toothed wheel are monitored by an optical sensor with a resulting series of pulses being accumulated to define the rotation of the toothed wheel and thereby the movement and position of the print head carriage. A home carriage position is directly indicated via a carriage position indicating member which is operated by the print head carriage to interrupt the optical sensor of the preferred embodiment.

Method and apparatus for monitoring print head carriage

A printer ribbon cassette mounting apparatus includes a pair of aligning posts and a pair of resilient latch members mounted on the lower surface of the cassette housing. The posts and latch members engage complementary openings in wall portions of the printer with which the cassette engages. Two restrainers extend from the lower surface of the cassette in parallel spaced relation to the latch members, and prevent excessive bending of said latch members.

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Groton, NY, United States of America

James W Lee