JP2594981B2 - Recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional recording apparatus, and more particularly, reciprocates a recording head mounted on a carriage from a home position along a recording material, and moves the recording head outward. The present invention relates to a bidirectional recording apparatus for recording one line at a time in both the return and return directions.

[Conventional technology]

FIG. 4 shows an example of a conventional recording apparatus. Here, 1 is a recording head mounted on the carriage 2, 3 is a platen 4
The recording head 1 is in contact with the sheet 3 for recording, and a head-down position where the recording head 1 separates from the sheet 3 during sheet feeding by the platen 4. The space is configured to be swingable by driving means (not shown). 5 is a guide bar for moving the recording head 1 along the sheet 3 for main scanning, 6 is a wire whose both ends are locked to the carriage 2 and is stretched between pulleys 7 and 8, and 8 is a carriage. It is a moving pulse motor.

In the printing apparatus configured as described above, the main scanning of the recording is performed by the recording head 1 by the movement of the carriage 2, and the sub-scanning is performed by the sheet feeding by the platen 4 in the direction of the arrow P. In order to detect the position, a home position sensor 9 is provided, and when the carriage 2 moves to this position, a light blocking plate 10 provided on the carriage 2 cuts off the optical path of the home position sensor. The initial position is recognized.

[Problems to be solved by the invention]

However, in the conventional recording apparatus as described above, for example, the carriage is moved to the point Q on the sheet shown in FIG.
When the vehicle moves from the left side and stops, and when it moves to the point Q from the home position and stops, a difference occurs between the stop positions due to backlash or the like in the pulse motor or its driving means. When printing is performed in both the forward and backward passes, a gap occurs between the forward and backward passes, and especially in the case of a vertical ruled line that is connected to the image in two or more lines, it is not connected vertically. Therefore, there is a restriction that bidirectional recording cannot be performed when the ruled lines extending over the upper and lower two lines are recorded without shifting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus that can be controlled so as to eliminate the above-described shift that occurs in recording in bidirectional recording in order to solve the above-mentioned conventional problems and solve the problem.

[Means for solving the problem]

In order to achieve the above object, the present invention includes a recording unit mounted on a carriage, and a pulse motor that scans the carriage by step driving by applying a driving pulse, and the carriage moves forward by the pulse motor. A recording device for performing recording on the recording material by the recording means during the scanning between the home position and the homeward position, a position detection sensor for detecting the presence or absence of the carriage, and a one-step drive of the pulse motor. A counter that counts clock pulses during a drive cycle T of the pulse motor from the start; a count value of the counter when the presence of the carriage is detected in the return path of the carriage by the position detection sensor; And the count value of the counter when the absence of the carriage is detected. Hazuki calculates the forward and shift the position of the backward scan of the carriage, and having a control means for controlling the timing of the recording in the forward and backward scans of the carriage.

[Action]

According to the present invention, when the carriage is guided to the home position on the return path, and the light blocking plate provided on the carriage blocks the home position sensor, the carriage starts moving from the home position toward the forward path. When the light blocking state of the home position sensor is released by the light blocking plate, a difference occurs in the phase of the pulse motor. Therefore, by using a counter that counts clock pulses during the driving cycle of one step of the pulse motor. , The difference between the forward and backward movements is 1
It is possible to detect within the moving range of the carriage due to the drive of the step, and to control the printing timing in the forward path and the printing timing in the backward path based on the amount of the shift, thereby to realize the shift of the print image as described above. Can be eliminated.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

FIG. 1 shows a circuit configuration for performing recording according to the present invention. Here, reference numeral 11 denotes a driver for driving the recording head 1, and reference numeral 12 denotes a driver for a platen driving motor 13 for sub-scanning. Reference numeral 15 denotes a central processing unit CPU, and the CPU 15 has a counter 16.
Each time a pulse is driven, a clock pulse is counted during a period T until the next drive, and the clock pulse returns to zero at the next pulse.

A storage device RAM 17 stores information for recording and is used as a work area of the CPU 15, and a storage device ROM 18 stores programs, data, and the like of the CPU 15. Reference numeral 19 denotes a circuit for driving the pulse motor 8, which moves the carriage 2 in the step of the cycle T described above, and performs recording by the recording head 1 in accordance with the movement.

By the way, in the bidirectional recording apparatus thus configured, the carriage 2 is now driven by driving the pulse motor 8.
In FIG. 2A, when the light-shielding plate 10 cuts off the optical path of the home position sensor 9 when the light-shielding plate 10 moves from the right to the left in the example of FIG.
As shown. Here, T is the above-described period of the pulse motor 8, and time X is the time TB elapsed from the B phase to the A phase in the pulse motor 8, and at this time X, the signal of the home position sensor 9 is output. Changes from “L” level to “H” level.

Next, when the carriage 2 moves to the right from the state where the carriage 2 is stopped to the position of the home position sensor 9 in the example of FIG. Is shown as Y in FIG. 2B. In this case, if there is no mechanical displacement due to backlash etc. in the drive system of the carriage,
This time Y exactly coincides with the time X shown in FIG. 2A, and the sum of the times TA and TB shown here should match the period T. However, since a deviation actually occurs, the times X and Y Does not match, and the time point Y is a time point after the lapse of the time TA from the phase A to the phase B, and at this time point Y, the signal of the home position sensor 9 changes from the “H” level to the “L” level.

That is, when expressed as time in a cycle unit, (T−
(TA−TB), and when the movement distance of the carriage 2 corresponding to the cycle T is S, the shift amount S _L
Is Becomes

Therefore, the timing of recording on the return path when there is no deviation is set to be (T
The above-described deviation can be corrected by performing control so as to be delayed by (−TA−TB) time.

FIG. 3 shows an operation procedure of the above-described shift correction according to the present invention. First, in step S1, the counter 16 is reset to zero, and in the next step S2, the pulse motor 8
Advances in the backward direction by one pulse, and determines in step S3 whether the home position sensor 9 has been turned "on" during that time. Here, if it is determined that the sensor 9 is not turned "ON", the process branches to step S31 to determine whether or not the time of the cycle T has passed. If it has passed, the process returns to step S1 and the operations of steps S1 to S3 Is repeated. If the time of the cycle T has not passed in step S31, the process returns to step S3 and waits until the sensor 9 is turned on.

If it is determined in step S3 that the home position sensor 9 is turned on, the process proceeds to step S4, where the counter value TB at the time when the home position sensor 9 is turned on is read, and the pulse motor 8 is stopped in step S5. Then, in the next step S6, the counter 16 is reset to zero, and
Proceeding to S7, the pulse motor 8 is driven by one step in the outward direction at a period T. Thus, in step S8, it is determined whether or not the home position sensor 9 has been turned "off".
If it is not determined to be "OFF", the flow branches to step S81 to determine whether or not the time of the period T has passed. If it is determined that the time has passed, the flow returns to step S6 and the operations of steps S6 to S8 are repeated. . If the period T has not passed in step S81, the process returns to step S8. Furthermore, if it is determined in step S8 that the sensor 9 is "off", the counter value TA at the time of "off" is read in step S9, and the value of (T-TA-TB) is read in step S10. Is calculated. Then, control may be performed such that the recording timing by the recording head 1 is delayed on the return path from the outward path by a time corresponding to (T-TA-TB).

〔The invention's effect〕

As described above, according to the present invention, by using the counter that counts the clock pulse during the driving cycle of the pulse motor from the start of the one-step driving of the pulse motor, the carriage on which the recording head is mounted can move in the return path. It is possible to detect a phase shift of the stepping motor between a time point detected by the home position sensor when returning to the home position and a time point detected by the home position sensor when the carriage moves from the home position on the outward path, By controlling the recording timing to be shifted between the forward path and the return path in accordance with the deviation, it is possible to eliminate the deviation of the image over the upper and lower two rows in bidirectional recording.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit according to the present invention, FIG. 2A and FIG. 2B are explanatory diagrams of the principle of detecting a recording deviation according to the present invention, and FIG. 3 is a flowchart showing a control operation procedure according to the present invention. FIG. 4 is a perspective view showing an example of the configuration of a conventional recording apparatus. 1 Print head, 2 Carriage, 3 Recording material (sheet), 4 Platen, 8 Pulse motor, 9 Home position sensor, 10 Shutter plate, 13 Platen drive Motor, 15 central processing unit, 16 counter.

Claims (1)

(57) [Claims] 1. A recording device mounted on a carriage, and a pulse motor that scans the carriage by stepwise driving by applying a driving pulse, wherein the pulse motor scans the forward path and the backward path of the carriage. In a recording apparatus for performing recording on a recording material by the recording means, a position detection sensor disposed at a home position and detecting the presence or absence of the carriage; and driving of the pulse motor from the start of one-step driving of the pulse motor. A counter that counts clock pulses during a period T; a count value of the counter when the presence of the carriage is detected on the return path of the carriage by the position detection sensor; and a absence of the carriage on the outward path. Based on the count value of the counter when detected,
And a control unit that calculates a shift between the forward and backward scanning positions of the carriage and controls the timing of printing in the forward and backward scanning of the carriage.