US4911566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking control system for thermal printhead
Assignee: Minolta Co Ltd
•
Filing: 1988-06-06
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Granted: 1990-03-27
•
Expires: 2008-06-06
Abstract
Abstract A thermal printer in which a thermal head block is moved into and out of pressure contact with a platen roller through a cam mechanism which is driven by a controlled DC motor. The DC motor alternately effects dynamic braking and negative-phase braking before the thermal head is pressed upon the platen roller.
Inventors
- 👤 Chiharu Imaseki
- 👤 Takeshi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:36
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/304; B41J25/316
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A thermal printer, comprising: a thermal head adapted for movement into and out of pressure contact with a platen roller; pressing and separating means for moving said thermal head between a contact position and a separated position; a DC motor driving said pressing and separating means, said motor including feeder terminals for receiving an input voltage; first braking means for causing a short-circuit between said feeder terminals; second braking means for applying a braking voltage to said feeder terminals, said braking voltage having a polarity opposite that used to drive said motor; and control means for stopping said thermal head at said contact position during movement from said separated to said contact position by alternately activating said first braking means and said second braking means prior to said thermal head reaching said contact position and for stopping said thermal head at said separated position during movement from said contact to said separated position by activating only said first braking means prior to said thermal head reading said separated position
Claim 2
Dependent Claim
169 words
A thermal printer, comprising: a thermal head adapted for movement into and out of pressure contact with a platen roller; pressing and separating means for moving said thermal head between a contact position and a separated position; a DC motor driving said pressing and separating means, said motor including feeder terminals for receiving an input voltage; first braking means for causing a short-circuit between said feeder terminals; second braking means for applying a braking voltage to said feeder terminals, said braking voltage having a polarity opposite that used to drive said motor; and control means for stopping said thermal head at said contact position during movement from said separated to said contact position by alternately activating said first braking means and said second braking means prior to said thermal head reaching said contact position and for stopping said thermal head at said separated position during movement from said contact to said separated position by activating only said first braking means prior to said thermal head reading said separated position
Claim 3
Dependent Claim
41 words
A thermal printer as in claim 1, further comprising detecting means for detecting the position of said pressing and separating means, and said control means activating said first and said second braking means in response to output from said detecting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |