EP0226449A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus and method for calculating parameters of print head drive system for printer
Assignee: International Business Machines Corp
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Filing: 1986-12-10
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Granted: —
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Expires: 2006-12-10
Abstract
Abstract The present invention relates to a printer of the type which comprises a print head (24) for performing printing operations on a print medium, a drive system (16. 18) for moving the print head across a print medium at a selected speed. means (2. 10) for generating a drive signal (PWM) for supplying to the drive system so as cause movement of the print head at a required speed, and means (2) for calculating parameters of the print head drive system According to the invention the printer is characterised in that the means for calculating parameters of the print head drive system comprises means for supplying a drive signal of a first value (V 1 ) to the print head drive system. means for supplying a drive signal of a second value (V 2 ) to the print head drive system, means for measuring a first speed of movement (Vel1) of the print head when the drive system is supplied with the first drive signal and for measuring a second speed of movement (Vel 2 ) of the print head when the drive system is supplied with the second drive signal. The parameter calculating means further comprises a constant calculating means. for calculating from the values of the first and second drive signals and the first and second speeds of movement, a drive signal value vs. print head speed constant (K According to a preferred embodiment of the invention, the parameter calculating means further comprises additional means for calculating, from the values of the first and second drive signals and the first and second speeds of movement, a constant (V f ) representing the frictional resistance to operation of the print head drive system. The present invention also relates to a method of calculating parameters of a print head drive system for a printer utilising apparatus as above.
Inventors
- 👤 Barry Richard Cavill
- 👤 Raymond Andrew Schulz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 22:21
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/202; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; G05B2219/00; G05B2219/30; G05B2219/42; G05B2219/42155; G05B2219/42237
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
212 words
A printer comprising a print head (24) for performing printing operations on a print medium, a drive system (16,18) for moving said print head across a print medium at a selected speed, and means (2, 10) for generating a drive signal (PWM) for supplying to said drive system so as cause movement of said print head at a required speed, and means (2) for calculating parameters of said print head drive system, characterised in that said means for calculating parameters of said print head drive system comprises means for supplying a drive signal of a first value (V 1 ) to said print head drive system, means for supplying a drive signal of a second value (V 2 ) to said print head drive system, means for measuring a first speed of movement (νel t ) of said print head when said drive system is supplied with said first drive signal and for measuring a second speed of movement (Vel 2 ) of said print head when said drive system is supplied with said second drive signal, and constant calculating means (2), for calculating from the values of said first and second drive signals and said first and second speeds of movement, a drive signal value vs. print head speed constant (K).
Claim 2
Dependent Claim
212 words
A printer comprising a print head (24) for performing printing operations on a print medium, a drive system (16,18) for moving said print head across a print medium at a selected speed, and means (2, 10) for generating a drive signal (PWM) for supplying to said drive system so as cause movement of said print head at a required speed, and means (2) for calculating parameters of said print head drive system, characterised in that said means for calculating parameters of said print head drive system comprises means for supplying a drive signal of a first value (V 1 ) to said print head drive system, means for supplying a drive signal of a second value (V 2 ) to said print head drive system, means for measuring a first speed of movement (νel t ) of said print head when said drive system is supplied with said first drive signal and for measuring a second speed of movement (Vel 2 ) of said print head when said drive system is supplied with said second drive signal, and constant calculating means (2), for calculating from the values of said first and second drive signals and said first and second speeds of movement, a drive signal value vs. print head speed constant (K).
Claim 3
Dependent Claim
72 words
A printer as claimed in claim 1 characterised in that said constant calculating means utilises the equation where K = value of said drive signal value vs. print head speed constant, Vi = value of said first drive signal, V 2 = value of said second drive signal, Vel 1 = value of said first speed of print head movement, Vel 2 = value of said second speed of print head movement.
Claim 4
Dependent Claim
58 words
A printer as claimed in either of the preceding claims characterised in that said parameter calculating means further comprises additional means for calculating, from the values of said first and second drive signals and said first and second speeds of movement, a constant (V f ) representing the frictional resistance to operation of said print head drive system.
Claim 5
Dependent Claim
103 words
A printer as claimed in claim 3 as dependent on claim 2 characterised in that said additional constant calculating means utilises the equation where V f = value of the constant representing frictional resistance, V N = value of any preselected drive signal which falls on the line defined by the points (Veli, V 1 ) and (Vel 2 , V 2 ) on a graph with axes Vel and V, K = value of the drive signal value vs. print head speed constant, AN = assumed print head speed when drive signal of value V N is supplied to the drive system.
Claim 6
Independent Claim
212 words
A method of calculating parameters of a print head drive system, in a printer of the type which comprises a print head (24) for performing printing operations on a print medium, a drive system (16, 18) for moving said print head across a print medium at a selected speed, and means (2, 10) for generating a drive signal (PWM) for supplying to said drive means so as cause movement of said print head at a required speed, characterised in that said method comprises supplying a drive signal of a first value (V i ) to said print head drive system for a first movement of said print head, supplying a drive signal of a second value (V 2 ) to said print head drive system for a second movement of said print head, measuring a first speed of movement (Vel 1 ) of said print head when said drive system is supplied with said first drive signal and measuring a second speed of movement (Vel 2 ) of said print head when said drive system is supplied with said second drive signal, and calculating from the values of said first and second drive signals and said first and second speeds of movement a drive signal value vs. print head speed constant (K).
Claim 7
Independent Claim
212 words
A method of calculating parameters of a print head drive system, in a printer of the type which comprises a print head (24) for performing printing operations on a print medium, a drive system (16, 18) for moving said print head across a print medium at a selected speed, and means (2, 10) for generating a drive signal (PWM) for supplying to said drive means so as cause movement of said print head at a required speed, characterised in that said method comprises supplying a drive signal of a first value (V i ) to said print head drive system for a first movement of said print head, supplying a drive signal of a second value (V 2 ) to said print head drive system for a second movement of said print head, measuring a first speed of movement (Vel 1 ) of said print head when said drive system is supplied with said first drive signal and measuring a second speed of movement (Vel 2 ) of said print head when said drive system is supplied with said second drive signal, and calculating from the values of said first and second drive signals and said first and second speeds of movement a drive signal value vs. print head speed constant (K).
Claim 8
Dependent Claim
68 words
A method as claimed in claim 5 characterised in that it utilises the equation where K = value of said drive signal value vs. print head speed constant. Vi = value of said first drive signal, V 2 = value of said second drive signal, Veh = value of said first speed of print head movement, Vel 2 = value of said second speed of print head movement.
Claim 9
Dependent Claim
53 words
A method as claimed in claim 5 or claim 6 characterised in that said method further comprises calculating, from the values of said first and second drive signals and said first and second speeds of movement, a constant (V f ) representing the frictional resistance to operation of said print head drive system.
Claim 10
Dependent Claim
101 words
A method as claimed in claim 7 as dependent of claim 6 characterised in that said it utilises the equation where V f = value of the constant representing frictional resistance, V N = value of any preselected drive signal which falls on the line defined by the points (Vel 1 , Vi) and (Vel 2 . V 2 ) on a graph with axes Vel and V, K = value of the drive signal value vs. print head speed constant, AN = assumed print head speed when the drive signal of value V N is supplied to the drive system.
References Cited (Backward Citations)
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