# US 4,395,945 A · Hammer bank assembly

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- Number: US 4,395,945 A
- Document ID: US4395945A
- Status: Granted
- Kind: A
- Application number: 06/299,043
- Filed: 1981-09-03
- Granted: 1983-08-02
- Earliest claimed: 1979-08-13
- Assignees: Dataproducts Corporation
- Inventors: Val K. Jezbera
- Web page: https://patentgrep.com/patent/US4395945A

## CPC

- B41J 9/127: Mounting of hammers
- B41J 9/10: of more than one hammer, e.g. one for each character position
- B41J 9/42: with anti-rebound arrangements
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A hammer bank assembly for use in line printers. The assembly includes an extruded metal rear frame having a uniform thickness and a plurality of machined mounting surfaces which are machined in accurate relationship with respect to one another. A pair of extruded plastic shoes are mounted to the top and bottom of the frame and also include machined surfaces for accurately aligning them with respect to the frame. The shoes include a plurality of mounting slots which are cut by means of a gang cutter. The slots serve to accurately align a plurality of print hammers in the shoes. The hammers are insulated with respect to the frame and the shoes in order to prevent sliding motion and subsequent wearing of the print hammers. Also disclosed are several methods of simplifying the construction procedure of the hammer bank assembly.

## Claims

### Claim 1

A hammer bank mounting assembly for mounting a plurality of print hammers of the type having a flat coil section supported by a pair of crossed springs which extend through a foot member, comprising:
an elongated frame having a vertical planar frontal region and a forwardly extending horizontal portion, wherein a plurality of print hammers are securable to said horizontal portion parallel to one another and substantially perpendicular to said frontal region and to said horizontal portion, said frontal region including a plurality of openings extending through to the rear of said frame;
a plurality of backstop screws passing through said openings and extending forward from said planar region, wherein the backstop screws are movable within the openings; and
a plurality of resilient screw tips, one each covering the end of each backstop screw, said screw tips being integral with a resilient common strip member, wherein an edge of said flat coil section of each hammer is biased against one of said screw tips when secured to said assembly in order to place a prestress upon each hammer.