# US 8,783,181 B2 · Detecting an unsecured state of a mandrel

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- Number: US 8,783,181 B2
- Document ID: US8783181B2
- Status: Granted
- Kind: B2
- Application number: 13/366,403
- Filed: 2012-02-06
- Published: 2013-08-08
- Granted: 2014-07-22
- Earliest claimed: 2012-02-06
- Assignees: Eastman Kodak Company
- Applicants: Tamir Olpak; Arie Gez
- Inventors: Tamir Olpak; Arie Gez
- Web page: https://patentgrep.com/patent/US8783181B2

## CPC

- B41C 1/00: Forme preparation
- B41C 1/05: Heat-generating engraving heads, e.g. laser beam, electron beam
- G03F 7/2055: {for the production of printing plates; Exposure of liquid photohardening compositions}
- B41C: PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES (photomechanical processes for producing printing surfaces G03F; photoelectrical processes for producing printing surfaces G03G)
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)

## Abstract

A mandrel position analyzer (108) in an imaging device (100) includes a head stock (144) for a first side of the mandrel; a tail stock (104) for a second side of the mandrel; a first encoder (212) attached to the head stock adapted to measure first signals wherein the first signals are generated by movement of the mandrel; a second encoder (208) attached to the tail stock adapted to measure second signals wherein the second signals are generated by movement of the mandrel; an analyzer (224) which compares measured results of the first signals and results of the second signals; and if the measured results do not match generating an abnormal state of the mandrel signal alarm (260).

## Claims

### Claim 1

A mandrel position analyzer in an imaging device comprising:
a head stock for a first side of the mandrel;
a tail stock for a second side of the mandrel;
a first encoder attached to the head stock adapted to measure first signals wherein the first signals are generated by movement of the mandrel to form a first set of results, wherein the first set of results represents a rotational speed of the mandrel;
a second encoder attached to the tail stock adapted to measure second signals wherein the second signals are generated by movement of the mandrel to form a second set of results, wherein the second set of results represents the rotational speed of the mandrel;
an analyzer which compares the first set of results to the second set of results; and
an alarm;
wherein if the first set of results is different from the second set of results, the alarm alerts an operator.

### Claim 2 (depends on 1)

The mandrel position analyzer according to claim 1 further comprising:
a third encoder attached to a motor drum wherein the motor drum is adapted to rotate the mandrel to form a third set of results;
wherein the third encoder is adapted to generate third signals that are generated by the motor drum rotation; and
wherein the analyzer is configured to compare the first set of results to the third set of results and if the first set of results is different from the third set of results, an abnormal state of a mandrel operation is detected.