EP0019694A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Processor controlled printing device and operation thereof
Assignee: International Business Machines Corp
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Filing: 1980-03-20
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Granted: —
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Expires: 2000-03-20
Abstract
Abstract In a printing device including a paper feed drum 10 and a printing array 250, the movements of the drum and array are controlled by servo systems 62 and 264. Both servo loops include a common micro-processor. During a non-printing cycle of the machine, the processor selects certain operating parameters and stores these parameters as critical operating parameters for use in subsequent printing cycles.
Inventors
- 👤 John William Irwin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:58
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/202
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A printing device including sheet feeding means for feeding sheets through a printing station and means for transporting a print mechanism at the printing station, characterised in that said feeding and transporting means are driven independantly in response to output control signals from a digital processor which receives, as its inputs, sensor data signals from the feeding and transporting means, said processor including means for selecting predetermined sensor data values during a non-printing profile cycle of the device as critical operating parameters, means for storing said critical operating parameter values and for employing the stored parameter values as operating parameters during a printing cycle subsequent to a profile cycle.
Claim 2
Dependent Claim
109 words
A printing device including sheet feeding means for feeding sheets through a printing station and means for transporting a print mechanism at the printing station, characterised in that said feeding and transporting means are driven independantly in response to output control signals from a digital processor which receives, as its inputs, sensor data signals from the feeding and transporting means, said processor including means for selecting predetermined sensor data values during a non-printing profile cycle of the device as critical operating parameters, means for storing said critical operating parameter values and for employing the stored parameter values as operating parameters during a printing cycle subsequent to a profile cycle.
Claim 3
Dependent Claim
42 words
A printing device as claimed in claim 1 further characterised by updating means for updating the stored parameter values in accordance with the difference between each stored parameter value and the value of the associated sensor data value during a printing cycle.
Claim 4
Dependent Claim
81 words
A printing device as claimed in claim 1 or claim 2 further characterised in that said sheet feeding means includes a drum arranged to receive a sheet to be printed and to pass it through said printing station, said drum being rotatable at a sheet load speed and a print speed during a printing or a profile cycle and a first of said critical parameters comprises the time the drum takes to accelerate from the load speed to the print speed.
Claim 5
Dependent Claim
31 words
A printing device as claimed in claim 3 further characterised in that a second critical parameter comprises the distance the drum surface travels during deceleration from print speed to load speed.
Claim 6
Dependent Claim
28 words
A printing device as claimed in claim 4 further characterised in that a third critical parameter comprises the integral number of revolutions of the drum during said deceleration.
Claim 7
Dependent Claim
71 words
A printing device as claimed in any of claims 3 to 5 further characterised in that the print mechanism is transportable between home and away positions located outside the paper receiving area on the drum and a fourth critical parameter comprises the difference between said second critical parameter and the time of travel of the mechanism from one of said positions to the edge of the paper receiving area nearest thereto.
Claim 8
Dependent Claim
64 words
A printing device as claimed in any of claims 3 to 6 further characterised in that said sheet feeding means includes further feed means for directing sheets from a supply source on to the drum, and a further critical parameter, determined during a cycle including loading a sheet on to the drum, comprises the time taken to release a sheet on to the drum.
Claim 9
Dependent Claim
37 words
A printing device as claimed in any of claims 1 to 8 further characterised in that said feeding and transporting means are driven by separate loop servomechanism systems, each system including the digital processor in its loop.
Claim 10
Independent Claim
111 words
A method of operating a printing device including sheet feeding means for feeding sheets through a printing station and means for transporting a print mechanism at the printing station and characterised in that said feeding and transporting means are driven independantly in response to output control signals from a digital processor which receives, as its inputs, sensor data signals from the feeding and transporting means including the steps of selecting predetermined sensor data values during a non- printing profile cycle of the device as critical operating parameter values, storing said critical operating parameter values and subsequently employing the stored parameter values as operating parameters during a printing cycle of the device.
Claim 11
Independent Claim
111 words
A method of operating a printing device including sheet feeding means for feeding sheets through a printing station and means for transporting a print mechanism at the printing station and characterised in that said feeding and transporting means are driven independantly in response to output control signals from a digital processor which receives, as its inputs, sensor data signals from the feeding and transporting means including the steps of selecting predetermined sensor data values during a non- printing profile cycle of the device as critical operating parameter values, storing said critical operating parameter values and subsequently employing the stored parameter values as operating parameters during a printing cycle of the device.
Claim 12
Dependent Claim
43 words
A method of operating a printing device as claimed in claim 8 further characterised by the step of updating the stored parameter values in accordance with the difference between each stored value and the value of the associated sensor data during printing cycles.
References Cited (Backward Citations)
No citation records indexed.
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