Browse Prior Art Database

Variable Compressor for Printer Forms

IP.com Disclosure Number: IPCOM000039221D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Baumberger, JG: AUTHOR [+5]

Abstract

A movable ramp element with graduated thickness can be used to selectively preload forms compressors and achieve uniform print intensity among printer forms of different thicknesses or parts. In Fig. 1, compressor flap 1 urges printer forms 2 toward type on a print belt 3 for impact hammer 4 that is driven by push rod 5. Spring 8 urges flap 1 counterclockwise about shaft 9 to compress the forms while permitting limited opposite motion. Positioner 6 engages plunger 10 that rests against ramp 11. Retaining screw 7 is in a different plane than spring 8 and limits the motion of flap 1 when the print belt carrier system is separated from the hammer unit for reasons such as form loading. The ramp has different thicknesses 12a, 12b, 12c (Fig.

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Variable Compressor for Printer Forms

A movable ramp element with graduated thickness can be used to selectively preload forms compressors and achieve uniform print intensity among printer forms of different thicknesses or parts. In Fig. 1, compressor flap 1 urges printer forms 2 toward type on a print belt 3 for impact hammer 4 that is driven by push rod 5. Spring 8 urges flap 1 counterclockwise about shaft 9 to compress the forms while permitting limited opposite motion. Positioner 6 engages plunger 10 that rests against ramp 11. Retaining screw 7 is in a different plane than spring 8 and limits the motion of flap 1 when the print belt carrier system is separated from the hammer unit for reasons such as form loading. The ramp has different thicknesses 12a, 12b, 12c (Fig. 2) so that its position can thus define correspondingly different rest positions for the right end of plunger 10 and alter the bias force of spring 8 on flap 1. Ramp 11 can be attached to an adjusting lever that moves the ramp to another position commensurate with thickness or other parameters which affect tear strength and fold stiffness of the forms being printed. This arrangement enables an operator to vary and select the compressive force of the flap when forms are changed.

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