JPS61179747A - System for controlling space of printer - Google Patents

Abstract

PURPOSE:To exclude an error due to the abnormality of an AGC control circuit, by a method wherein a carrier is stopped when the number of dot pulses before a first zone pulse is generated are a predetermined value or less and a state prior to starting printing is confirmed to perform retrying. CONSTITUTION:At the start time of a motor, the resetting of a dot pulse counter 15 is performed and, at the start time of the counter 15, the checking of a first S-dot is performed. When the number of the S-dots are a predetermined value or less, for example, when S<10, a carrier is stopped and retrying is performed if a state prior to starting printing is confirmed by looking a printing start flag 21. Retrying is performed so that the carrier returns to a position exceeding a left end sensor from the stop position and AGC is stabilized from the beginning. This retrying is further performed so that the number of retryings are recorded on a retrying counter 23 and the limit of the predetermined number of times are set. When the printing start flag is ON, the correction procesing of a dot error is finished.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention detects dot pulses and zone pulses from a slit disk sensor, inputs them to respective counters, and prints when a predetermined number of dot pulses are generated after the zone pulse is generated. The present invention relates to an improved printer space control scheme for driving a print carrier to start.

[Conventional technology]

An example of a space control mechanism for a print carrier of a conventional serial printer is as shown in FIG. It is driven by a space motor 6, and its movement timing in the space direction is controlled by a slit disk 1 provided at the other end and an optical sensor 2 that detects light emitted through the slit. FIGS. 4(g) and 4(b) show detected waveforms of the slit disk 1 and the light sensor 2. FIG.

provided. (6) (6) to (2) in the same figure show the waveforms of the senna output, zone pulse, and dot pulse of the photodetector 2.

Fig. 6 Hiro Fig. 5 with slit disk senna shown in Fig. 4
In the control circuit section for the space control mechanism shown in FIG.
The figure is a time chart showing the operation.

In FIG. 6, the output of the slit disk sensor 11 is passed through the amplifier 12 with AGO, the zone no.
) is input to the dot pulse counter 15.

Furthermore, it is put into the dot pulse human GO control circuit 13,
The AGO foot control is performed based on the level information (slice level SLI, BL2) given from the O-equipped amplifier 12.The zone address counter 14 initially starts with the print carrier 4 set at the left end, and the left end sensor, The dot pulse counter 15 is reset and counted by checking the output of the amplifier 16, and inputs the counted number as a zone address to the space control circuit 17.The dot pulse counter 15 is reset by checking the output of each zone pulse, and sets the dot count value to the space. Then, printing is performed at a predetermined number of dot pulses (L) from a predetermined zone address.

FIGS. 7-7 are time charts showing the relationship among the motor speed, zone pulse (ZP), and dot pulse (DP) when the printing carrier is excited.

That is, after the space motor is started, printing is controlled to start at a predetermined dot pulse value after the first zone pulse is detected. In this case, the position in the space direction is checked to see if it is within N=set value ±3 from the first zone pulse zP.If there is an error, the check stops there and waits for manual recovery.

[Problem that the invention seeks to solve]

, in the above configuration, there is no interlayer during normal operation, but the sixth
If the human GO control circuit 13 in the figure becomes abnormal, for example, if the relative position between the slit disk 1 and the optical sensor 2 shown in FIG. When Dr starts at , DP may erroneously change to the ZP level. That is, immediately after the dot counter 15 starts, the first pulse or more than a few pulses of DP may turn into zp. In this case, the predetermined time cannot be set and the printing position will be shifted. Z
In the checking method of 3 on N dots between P and P, printing has already started at the time of error detection (first error) when there is only one zone pulse), making retry operation impossible.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printer space control system in which, when errors in dot pulses and zone pulses occur due to an abnormality in AGO control, retries are made for those that can be salvaged.

[Means for solving problems]

In order to achieve the above object, the printer space control method of the present invention controls the dot pulses from the slit disk sensor and the zone pulses generated for each predetermined plurality of dots by A.
Print carrier start is a printer space control method that drives the print carrier to start printing at the point when a predetermined number of dot pulses are generated after a predetermined zone pulse is generated, which is detected by a detection unit with GO and input into each counter. Accordingly, the dot counter is reset, and when the number of dot pulses until the first zone pulse is generated is less than a predetermined value, the carrier is stopped, and a retry is performed after checking before printing starts.

C effect] In the present invention, the fact that the print carrier is normally stopped near the center between the ZPs is utilized, and the number of S dots at the first ZPt after the start may be less than a certain number. For example, if an erroneous Luzone pulse is first generated due to the vibrations mentioned above, 0
This is the case. In such a case, confirm that it is before the start of printing and then perform the redo 2. This retry makes it possible to detect an erroneous signal at the time of the first erroneous signal zone pulse.

If the number of 8 dots is more than a certain number, it is handled as usual.

In this way, f! -Using 8 dots,
Reliability can be improved by detecting cases where it appears that there is an abnormality in the human GO control and retrying. [Embodiment] FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.

In the same figure, the difference from the conventional example shown in FIG. Perform a reset. Furthermore, a print start flag (register) 22 and a retry counter 23 are provided for the output of the space control circuit 17 to exchange data in the procedure of the present invention.

The procedure of the present invention is shown below with reference to the figure.

■Reset the dot pulse counter 15 when starting the motor.

(2) Check the first S dot when the dot pulse counter 15 starts.

(2) If S is less than a certain number of dots, for example 8 x 10, carrier stop processing is performed, and the printing start flag (register) 22 is checked and if printing has not yet started, a retry is performed.

- To retry, move from the stop position to the left end sensor and return to the next position (this is called carrier initialization), stabilize the AGO from the beginning, and retry.

(2) Tonori retry is performed by recording the number of retries in the retry counter 23 and setting a predetermined limit on the number of times.

(2) If S is more than a certain number of dots, apply the conventional time expansion procedure of 5) and 10, for example.

FIGS. 2-2 are enlarged time charts of the present invention corresponding to the conventional example shown in FIG. 6. The difference with Fig. 6 is that, as is clear from the DP waveform in (■), the number of dots S from the start to the detection of the first zP is used, and a new procedure is created when S is smaller than a certain number of dots. It was designed to be buried.

FIG. 3 is a flowchart showing the operation of the embodiment of the present invention.

In the same figure, after the start of printing, the retry counter 23° print start 72g 22. After each dot pulse counter 15 is cleared (reset), the space saver 6 is started. The case where the optical sensor output is detected is shown below. The flow on the left and the flow in the center are the conventional flow.
, the flow on the right is the flow added according to the present invention. In the conventional example, the DP until the first zP is detected is ignored, so first, if a zP is detected but it is not the first ZP, the number of dots between it and the second ZP is calculated. If N=80±3, the flow shifts to the left side. After the print start ZP is detected, the L dot is detected, the print start flag 22 is set, and print start processing is performed. Repeat this to finish.

In contrast to the conventional flat head described above, in the present invention, if the number of dots 8 after the motor start until the first zP is detected is 10 or more, it enters the conventional left side flow, but if the number of dots S is 10 or less, This also applies to stopping the print carrier. Note that the procedure after this stop processing also merges when N=80±6 does not occur in the center flow, that is, when dot E2- occurs. After the printing carrier stops, printing starts 7 lugs 22
If it is before printing starts, read 2 is performed.

The lid 2-i performs the carrier Yesia 2-ize described above, and the gear cutter starts printing at 7:7 and the dot nozzle counter clears. This can be repeated up to a limited number of times.

Note that if the print start 7 lug 22 is on, the dot error correction process ends.

〔Effect of the invention〕

As explained above, according to the present invention, when the printing carrier starts, the dot counter is reset, the number of dot pulses 8 until the first zone pulse is generated is checked,
For example, in the case of S>10, the conventional method is merged, and S>10
In this case, the procedure of the present invention is to stop the carrier, check before printing starts, and retry. As a result, it is possible to effectively eliminate errors in which DP incorrectly changes to GP due to an abnormality in the human GO control circuit caused by vibrations near the slit disk, etc., as described above, and improve reliability. If it helps you improve, it has a big impact. Furthermore, the present invention can be realized by simply adding procedures without making any structural changes.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 is a time chart showing the operation of the embodiment, Fig. 3 is a flowchart showing the procedure of the embodiment, and Fig. 4 shows the slit disk and detected waveforms. Figure 5 is a space control mechanism, Figure 6 is an explanatory diagram of the configuration of the conventional example, and Figure 7 is a time chart showing the operation of the conventional example.)
, in the figure, 11 is a slit disk sensor, 12 is an AGO
Attached amplifier, 13 is AGO control circuit, 14 is zone address counter, 15 is dot pulse counter, 16 is 7
end sensor, amplifier, 17 is a space control circuit, 2
Reference numeral 1 indicates an OR circuit, 22 indicates a print start flag, and 2 indicates a read/write start flag.

Claims (1)

[Claims] A printer that inputs a dot pulse and a zone pulse generated for each predetermined plurality of dots into each counter, and drives a print carrier so that printing starts when a predetermined number of dot pulses are generated after the predetermined zone pulse is generated. In the space control method, the dot counter is reset by the start of the printing carrier, and when the number of dot pulses until the first zone pulse is generated is less than a predetermined value, the carrier is stopped, and a retry is performed after checking before printing starts. Printer space control method.