Device for detecting a position of a printing material transported in a printing machine

Patent metadata

Field	Value
Publication number	US-2018093501-A1
Application number	US-201715718008-A
Country	US
Kind code	A1
Filing date	Sep 28, 2017
Priority date	Sep 30, 2016
Publication date	Apr 5, 2018
Grant date	—

Abstract

A device detects at least one position of at least a part of a printing material while the printing material is transported in a printing machine. The device includes an optical sensor for establishing a distance between a printing machine component and the printing material. The distance established by the optical sensor is temperature-compensated by a computer.

First claim

1 . A device for detecting at least one position of at least a part of a printing material while the printing material is transported in a printing machine, the device comprising:
an optical sensor for establishing a distance between a printing machine component and the printing material; and a computer for temperature-compensating the distance established by said optical sensor.

2 . The device according to claim 1 , which further comprises:
a light source emitting light beams in a beam path in a direction toward said optical sensor; at least parts of the printing material being located in said beam path between said light source and said optical sensor; and said optical sensor being a CCD line sensor including a plurality of CCD elements.

3 . The device according to claim 1 , wherein an intensity pattern of said optical sensor is saved on said computer, and said intensity pattern represents a measurement uninfluenced by external temperatures.

4 . The device according to claim 3 , wherein said computer compares an intensity pattern established by said optical sensor under thermal influences and said saved intensity pattern without thermal influence, and said computer calculates said thermal influence and compensates for said thermal influence in a computational way based on a deviation between said two patterns.

5 . The device according to claim 4 , wherein said computer compares a height difference between a first local maximum of said saved intensity pattern and a first local maximum of said measured intensity pattern in said comparison of said intensity patterns carried out on said computer.

6 . The device according to claim 2 , wherein said light source includes a lens to widen an illumination in parallel.

7 . The device according to claim 2 , wherein said light source is dot-shaped.

8 . The device according to claim 1 , which further comprises a temperature control device for controlling a temperature of at least parts of the printing machine in a region of a measuring process.

9 . The device according to claim 1 , wherein said computer switches the printing machine off when a measured distance between said optical sensor and the printing material exceeds a predefined value.

10 . The device according to claim 9 , wherein said predefined value is a temperature-dependent switch-off threshold.

11 . The device according to claim 2 , which further comprises a cover plate disposed between said light source and said optical sensor.

12 . The device according to claim 1 , which further comprises at least one temperature sensor for measuring a temperature of grippers of the printing machine for transporting sheet-shaped printing materials, said at least one temperature sensor transmitting said measured temperature to said computer.

Assignees

• Heidelberger Druckmasch Ag

Inventors

• Knauf Stefan
• Henn Andreas
• Ritz Juergen
• Lorenz Olaf
• Schmidt Thomas
• Muench Stefan
• Goebel Thomas
• Kabus Wolfgang
• Weinig-Kress Stephanie
• Mutschall Stefan
• Norrick Nicklas Raymond
• Neeb Steffen

Classifications

• B41J29/48

  responsive to breakage or exhaustion of paper or approach of bottom of paper · CPC title

• B41J2/1753

  Details of contacts on the cartridge, e.g. protection of contacts · CPC title

• B41J11/0095 Primary

  Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end · CPC title

• B41J2/1408

  Structure dealing with thermal variations, e.g. cooling device, thermal coefficients of materials · CPC title

• B41J2/3355

  characterised by materials · CPC title