Claims
- 1. A gap adjusting unit of a printer comprising: a platen; a printing head opposed to the platen; a gap adjusting means for changing a head gap between the printing head and the platen by rotating an eccentric shaft; a sensor for detecting the gap; a pulse motor for driving the eccentric shaft; a means for detecting a rotational angle of the pulse motor; a means for detecting a first rotational angle of the motor when a predetermined gap is detected in the case where the pulse motor is rotated in one direction and also detecting a second rotational angle of the motor when the predetermined gap is detected in the case where the pulse motor is rotated in the reverse direction; and a means for computing an intermediate angle of the first and the second rotational angle of the motor so as to set the intermediate angle as an initial value.
- 2. A gap adjusting unit of a printer comprising: a platen; a printing head opposed to the platen; a medium conveyance means for conveying a printing medium between the platen and the printing head; a gap adjusting means for changing a gap between the printing head and the platen by rotating a cam; a pulse motor for driving the cam; a means for previously storing a relation between a rotational angle of the pulse motor and a position of the printing head on a table; a gap sensor for detecting a position at which the printing head or a reference surface for detecting a gap attached to a carrier mounted on the printing head comes into contact with the platen; a means for reading the table to find a rotational angle of the pulse motor corresponding to an amount of return when the printing head is returned from the contact position by a predetermined amount of gap; and a control means for rotating the pulse motor by a rotational angle corresponding to the amount of return.
Priority Claims (7)
Number |
Date |
Country |
Kind |
6-270223 |
Oct 1994 |
JPX |
|
6-270224 |
Oct 1994 |
JPX |
|
6-270225 |
Oct 1994 |
JPX |
|
7-209532 |
Aug 1995 |
JPX |
|
7-209533 |
Aug 1995 |
JPX |
|
7-209556 |
Aug 1995 |
JPX |
|
7-209702 |
Aug 1995 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a divisional of U.S. patent application Ser. No. 08/647,894, filed as PCT/JP95/02060 Oct. 6, 1995 now U.S. Pat. No. 5,713,674. The subject matter of this application is hereby incorporated by reference.
US Referenced Citations (18)
Foreign Referenced Citations (14)
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57-99844 |
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JPX |
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JPX |
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JPX |
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JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
647894 |
Jun 1996 |
|