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Print Head Calibration Method for Serial Printer

IP.com Disclosure Number: IPCOM000035162D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Kobayashi, S: AUTHOR

Abstract

The present method provides assurance in positioning a print head at the initial print position in a serial printer using only microcode programs. When any trouble, such as a mechanical failure, a drive logic failure or a feed back signal control logic failure, occurs in a head carrier calibration, the machine is stopped to indicate the error code of the defective area to be isolated.

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Print Head Calibration Method for Serial Printer

The present method provides assurance in positioning a print head at the initial print position in a serial printer using only microcode programs. When any trouble, such as a mechanical failure, a drive logic failure or a feed back signal control logic failure, occurs in a head carrier calibration, the machine is stopped to indicate the error code of the defective area to be isolated.

Fig. 1 shows a schematic indication of the head carrier movable area for calibration, and Fig. 2 shows a hardware configuration in which the present method can be practiced.

Referring to Fig. 1, the following steps describe the carrier calibration procedures according to this method: 1. Move the carrier in the forward direction (FWD) until it bumps against the right frame of the machine. 2. Clear the carrier position counter. 3. If the machine does not detect the carrier motor encoder pulse after 10 msec, it is judged as calibration error-1 (no emitter pulse is detected-forward). If the carrier does not lock after 2 seconds, it is judged as calibration error-2 (calibration timeout-forward). 4. Move the carrier in the reverse direction (RVS) until it bumps against the left frame of the machine with the carrier position counter increased by encoder pulses. 5. If the machine does not detect the carrier motor encoder pulse after 10 msec, it is judged as calibration error-3 (no emitter pulse is detected-reverse). If the carrier does not lo...