US3858702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for feeding a printer head
Assignee: KDDI Corp
•
Filing: 1973-08-20
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Granted: 1975-01-07
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Expires: 1993-08-20
Abstract
Abstract A device for feeding a printer head, in which a noncontact switch is provided along a straight path of the printer head so as to couple with the printer head at its end position. When the noncontact switch is coupled with the printer head in access to the end position, the noncontact switch assumes a second output state different from a first state generated at no coupling between the noncontact switch and the printer head. Shock of the printer head at the return motion to the end position is effectively reduced by utilizing change of states of the output of the noncontact switch.
Inventors
- 👤 Nobuhiro Azuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:29
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/68; B41J19/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
289 words
A device for feeding a printer head, comprising: feeding means for feeding the printer head along a straight path in a forward direction and a backward direction, said feeding means comprising a rotary capstan, a cable coupled to said capstan, a motor connected to said capstan to rotatially drive the same, and a shaft encoder for encoding the rotated angle of the motor; drive means for driving the motor to effect stepwise motion of the printer head in the forward direction by the use of a step pulse and the output of the shaft encoder and to effect movement of the printer head in one motion in the backward direction by the use of a return pulse; a noncontact switch arranged along the straight path to coupled with the printer head as the printer head moves therealong, said noncontact switch having a first state wherein the noncontact switch delivers an output signal to said motor to feed the printer head in the backward direction when the noncontact switch is not coupled with the printer head, having a second state wherein the noncontact switch delivers another output signal to said motor to feed the printer head in the forward direction when the noncontact switch is coupled with the printer head in advance of the printer head reaching an end position, and having a third state wherein the noncontact switch does not deliver any output signal when the printer head is returned to said end position; and switch means connected between the output of the noncontact switch and the drive means to be closed in response to the return pulse and to be opened when said noncontact switch is in said third state to control the pulses applied to said motor.
Claim 2
Independent Claim
289 words
A device for feeding a printer head, comprising: feeding means for feeding the printer head along a straight path in a forward direction and a backward direction, said feeding means comprising a rotary capstan, a cable coupled to said capstan, a motor connected to said capstan to rotatially drive the same, and a shaft encoder for encoding the rotated angle of the motor; drive means for driving the motor to effect stepwise motion of the printer head in the forward direction by the use of a step pulse and the output of the shaft encoder and to effect movement of the printer head in one motion in the backward direction by the use of a return pulse; a noncontact switch arranged along the straight path to coupled with the printer head as the printer head moves therealong, said noncontact switch having a first state wherein the noncontact switch delivers an output signal to said motor to feed the printer head in the backward direction when the noncontact switch is not coupled with the printer head, having a second state wherein the noncontact switch delivers another output signal to said motor to feed the printer head in the forward direction when the noncontact switch is coupled with the printer head in advance of the printer head reaching an end position, and having a third state wherein the noncontact switch does not deliver any output signal when the printer head is returned to said end position; and switch means connected between the output of the noncontact switch and the drive means to be closed in response to the return pulse and to be opened when said noncontact switch is in said third state to control the pulses applied to said motor.
Claim 3
Dependent Claim
78 words
A device for feeding a printer head according to claim 1, further comprising detection means connected to said noncontact switch to detect the change of said states of the output of the noncontact switch from the first state to the second state, and delay means for delaying the opening of the switch means by a time longer than an initial damped fluctuation of the output of the non-contact switch after the detection means detects said change of states.
Claim 4
Dependent Claim
20 words
A device for feeding a printer head according to claim 2, in which the detection means includes a schmit trigger.
Claim 5
Dependent Claim
57 words
A device for feeding a printer head according to claim 1, in which the noncontact switch comprises a pair of a lamp and a photoconductor opposed to each other at an air gap, and a shutter fixed to the printer head so as to coupled with the air gap at the end position of the printer head.
Claim 6
Dependent Claim
47 words
A device for feeding a printer head according to claim 1, further comprising a speed generator driven by said motor to control the drive means by the use of the output of the speed generator so as to apply a suitable brake action to the drive 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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |