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EP0170166A1
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Apparatus and method for paper feed control
Assignee: Toshiba TEC Corp
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Filing: 1985-07-18
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Granted: —
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Expires: 2005-07-18
Abstract
Abstract A paper feed control apparatus for a dot printer is provided which supplies a step pulse to a stepping motor (19) in a one-pitch feed mode at an interval of a reference time (T0) to intermittently rotate the stepping motor (19) in increments of a step angle, and which also supplies a step pulse to the stepping motor in a mufti-pitch feed mode at an interval of a time shorter than the reference time (TO) to continuously rotate the stepping motor (19) over a plurality of step angles. A motor drive control circuit (10, 14, 20, 22) is adapted to supply a step pulse to the stepping motor (19) in the mutti-pitch feed mode at a gradually shorted time interval, and to supply a final step pulse to the stepping motor (19) in a final portion of a driving cycle when the reference time (TO) passes after the generation of the step pulse.
Inventors
- 👤 Akira Oda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:25
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/485; B41J2/505; B41J2/5056; B41J11/00; B41J11/36; B41J11/42; Y; Y10; Y10S; Y10S400/00; Y10S400/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
A paper feed control apparatus for a dot printer which includes a stepping motor (19) rotated in increments of one step in response to a step pulse and a motor drive control circuit (10, 14, 20, 22) which, in a one-pitch feed mode, supplies a step pulse to the stepping motor (19) at an interval of a reference time (TO) to intermittently rotate the stepping motor (19) in increments of one step angle and, in a multi-pitch feed mode, supplies a step pulse to the stepping motor (19) at an interval of a time shorter than the reference time (TO) to continuously rotate the stepping motor (19) over a plurality of step angles, characterized in that counting means (RA3) is provided to which pitch number data representing the number of pitches for the motor to be driven at a start time is set and that said motor drive control circuit (10, 14, 20, 22) supplies the next step pulse (19) to the stepping motor (19) after the lapse of a time interval corresponding to the contents of said counting means (RA3), changes the contents of said counting means (RA3) in one direction each time the step pulse is generated, and supplies a final step pulse to the stepping motor (19) in the multi-pitch feed mode after the lapse of the reference time (TO) from the generation of the step pulse.
Claim 2
Dependent Claim
230 words
A paper feed control apparatus for a dot printer which includes a stepping motor (19) rotated in increments of one step in response to a step pulse and a motor drive control circuit (10, 14, 20, 22) which, in a one-pitch feed mode, supplies a step pulse to the stepping motor (19) at an interval of a reference time (TO) to intermittently rotate the stepping motor (19) in increments of one step angle and, in a multi-pitch feed mode, supplies a step pulse to the stepping motor (19) at an interval of a time shorter than the reference time (TO) to continuously rotate the stepping motor (19) over a plurality of step angles, characterized in that counting means (RA3) is provided to which pitch number data representing the number of pitches for the motor to be driven at a start time is set and that said motor drive control circuit (10, 14, 20, 22) supplies the next step pulse (19) to the stepping motor (19) after the lapse of a time interval corresponding to the contents of said counting means (RA3), changes the contents of said counting means (RA3) in one direction each time the step pulse is generated, and supplies a final step pulse to the stepping motor (19) in the multi-pitch feed mode after the lapse of the reference time (TO) from the generation of the step pulse.
Claim 3
Dependent Claim
101 words
A paper feed control apparatus according to claim 1, characterized in that said motor drive control circuit comprises memory means (14) for storing time data corresponding to the number of pitches the motor is to be driven, and that drive control means (10, 20, 22) is connected to read time data corresponding to the contents of said counting means (RA3) out of said memory means (14), to supply the step pulse to said stepping motor (19) after the lapse of the time corresponding to the read-out time data, and to change the contents of said counting means (RA3) in one direction.
Claim 4
Dependent Claim
70 words
A paper feed control apparatus according to claim 1 or 2, characterized in that said memory means (14) includes a first memory area for storing time data (TS) shorter than the reference time (TO) and corresponding to the number of pitches greater than a predetermined number N, and a second memory area for storing a plurality of sequentially increasing time data corresponding to the number of pitches N to 1.
Claim 5
Dependent Claim
117 words
A paper feed control apparatus according to claim 2 or 3, characterized in that said drive control means comprises the motor driver (22) for supplying the step pulse to the stepping motor (19) in response to a driving signal, a timer (20) for generating an interrupt signal when a set time passes and a control unit (10) for reading time data, corresponding to the contents of the counting means (RA3), out of said memory means (14) to set it to the timer (20), and for supplying the driving signal to the motor driver (22) in response to the interrupt signal from the timer (20), while changing the contents of the counting means (RA3) in said one direction.
Claim 6
Dependent Claim
134 words
A paper feed control method for use in a dot printer, characterized by the steps of supplying a step pulse to a stepping motor (19) in a one-pitch feed mode at an interval of a reference time (TO), and intermittently rotating the stepping motor (19) at a reference speed (VO), while supplying the step pulse to the stepping motor (19) at an interval of a time shorter than the reference time (TO) during at least a portion of a driving period, and rotating the stepping motor (19) at a speed higher than the reference speed (VO), characterized by further comprising the step of supplying a final step pulse to the step motor (19) in a final portion of the driving cycle so as to rotate the stepping motor (19) at the reference speed (VO).
Claim 7
Dependent Claim
134 words
A paper feed control method for use in a dot printer, characterized by the steps of supplying a step pulse to a stepping motor (19) in a one-pitch feed mode at an interval of a reference time (TO), and intermittently rotating the stepping motor (19) at a reference speed (VO), while supplying the step pulse to the stepping motor (19) at an interval of a time shorter than the reference time (TO) during at least a portion of a driving period, and rotating the stepping motor (19) at a speed higher than the reference speed (VO), characterized by further comprising the step of supplying a final step pulse to the step motor (19) in a final portion of the driving cycle so as to rotate the stepping motor (19) at the reference speed (VO).
Claim 8
Dependent Claim
45 words
A paper feed control method according to claim 5, characterized in that said stepping motor (19) is rotated at a speed (VS) faster than the reference speed (VO) until the number of the pitches reaches a predetermined value, and then at a gradually decreasing speed.
References Cited (Backward Citations)
US3643039A
Cited
DE2935319A1
Cited
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