# US 4,397,238 A · Reciprocating doctor mechanism

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- Number: US 4,397,238 A
- Document ID: US4397238A
- Status: Granted
- Kind: A
- Application number: 06/311,941
- Filed: 1981-10-16
- Granted: 1983-08-09
- Earliest claimed: 1980-10-17
- Assignees: Windmoller & Holscher
- Inventors: Jurgen Westerkamp
- Web page: https://patentgrep.com/patent/US4397238A

## CPC

- B41F 9/1009: {with reciprocating movement}
- B41F: PRINTING MACHINES OR PRESSES (manifolding devices or office printing machines B41L)

## Abstract

In a printing press where a doctor mounting is connected to a pivotable supporting member and the doctor is reciprocatable parallel to the plate cylinder axis, the doctor mounting is guided in a guide disposed on the supporting member and driven through an eccentric drive by an electric motor secured to the supporting member.

## Claims

### Claim 1

A doctor mechanism for use with a plate cylinder comprising:
a doctor positionable so as to cooperate with a plate cylinder;
mounting means for carrying the doctor;
supporting means for supporting said mounting means;
guide means provided on said supporting means for guiding movement of said mounting means;
drive means for reciprocating said mounting means along said guide means, said guide means being adapted to be mounted so that it extends parallel to the axis of the plate cylinder;
a rod having an end thereof supporting said supporting means;
a guide member for longitudianlly slidably guiding movement of said rod and for fixing said rod in a desired position;
a shaft supporting said guide member so that said guide member is pivotally movable whereby movement of said guide member moves said doctor with respect to the plate cylinder, said rod having a rack-shaped portion; and
a pinion meshing with said rack-shaped portion for longitudinally moving said rod.

### Claim 2

A doctor mechanism comprising:
a doctor for cooperating with a plate cylinder;
a mounting carrying said doctor;
a pivotally supported supporting member for supporting and for guiding movement of said mounting in a direction extending parallel to the axis of the plate cylinder; and
drive means for reciprocating the mounting with respect to said supporting member, said drive means comprising an electric motor secured on the supporting member and an eccentric drive driven by said motor.

### Claim 3 (depends on 2)

A doctor mechanism according to claim 2, wherein said supporting member carries stationary rails of a cross-roller carriage guide for guiding movement of said mounting, the carriage of said cross-roller carriage guide being connected to said mounting carrying said doctor.

### Claim 4 (depends on 2)

A doctor mechanism according to claim 2, wherein said eccentric drive comprises an elongated hole which extends in the mounting transversely to the direction of motion thereof, and a roller guided in said hole and eccentrically connected to a shaft of said motor.

### Claim 5 (depends on 4)

A doctor mechanism according to claim 4, further comprising a disc connected to the shaft of said motor, said roller being secured to said disc.

### Claim 6 (depends on 2)

A doctor mechanism according to claim 2, wherein the electric motor is a D.C. motor.