JPS63303782A - Serial printer - Google Patents

Abstract

PURPOSE:To enable recording result of high quality to be obtained by lightening an influence of a slackening amount of a belt, by driving a pulse motor following a slewing table conforming to a rotary direction. CONSTITUTION:Before a carriage 1 is moved to a pulley 4 side, increase in count value of an up down counter 10a is detected with a direction discrimination circuit 10b, and a rotary direction of a pulse motor 6 is identified as regular. Then, a regular indentifier signal is outputted to a selective signal generation circuit 10c. This circuit 10c outputs a selective signal for outputting a slewing table according to reverse rotation to a drive circuit 7, to a memory 9 according to the regular identifier signal. Further, when the carriage 1 is moved to a pulley 3 side, a direction discrimination circuit 10b detects decrease of a count value of the up and down counter 10a, identifies that the rotary direction of the pulse motor 6 is reverse, and outputs a reverse discrimination signal to the circuit 10c. The circuit 10c outputs a selective signal for outputting the slewing table conforming to regular rotation to the drive circuit 7, to the memory 9 according to the reverse discrimination signal. Thereby, the pulse motor 6 is rotatively driven following either regular directional slewing table.

Description

[Detailed Description of the Invention] [Summary] In a serial printer configured to move a carriage on which a recording head is mounted using a pulse motor, the pulse motor is moved according to a slewing table according to the rotation direction. It is designed to be driven.

[Industrial application field]

The present invention relates to a serial printer, and more particularly to a serial printer configured to move a carriage on which a recording head is mounted using a pulse motor, in which the pulse motor can be driven according to a slewing table according to a rotational direction. It is related to.

A type of printer is a serial printer that is configured to perform recording while reciprocating a carriage mounted with a recording head such as a wide dot head, an inkjet head, a thermal head, etc. in a direction perpendicular to the feeding direction of recording paper. be.

A pulse motor is generally used as a drive source for reciprocating the carriage in such serial printers.

To drive such a pulse motor, a slewing table is used in which drive data is preprogrammed to move the carriage with speed-distance characteristics as shown in FIG. 5, for example.

[Prior Art] FIG. 4 is a diagram illustrating an example of the configuration of a conventional camphor serial printer. In the figure, reference numeral 43 denotes a carriage on which the recording head 2 is mounted, and is carried on a belt 5 stretched between pulleys 3 and 4. 6 is a pulse motor that transmits rotational force to the pulley 4; 7 is a drive circuit for driving the pulse motor 6; and 8 is drive data for driving the pulse motor 96 with predetermined speed-distance characteristics through the drive circuit 7. A memory that stores preprogrammed slewing tables.

In such a configuration, the pulse motor 6 is connected to the memory 8
It is rotated based on the drive data of the slewing table read out to the drive circuit 7 from the drive circuit 7. The rotational output of the pulse motor 6 is transmitted to the pulley 3, which causes the belt 5 to travel in accordance with the drive data of the slewing table. As a result, the carriage 1 on which the recording head 2 is mounted,
Based on the drive data of the slewing table read from the memory 8, the robot moves with predetermined speed-distance characteristics.

[Problems to be Solved by the Invention] However, the pulse motor 6 in the conventional serial printer has a common slewing table as shown in FIG. It was driven according to.

For this reason, if a rubber belt is used as the belt 5,
As shown in FIGS. 6(a) and 6(b), since the effective length of the belt 5 between the carriage 1 and the pulse motor 6 differs depending on the moving direction of the carriage 1, the amount of deflection of the belt 5 also differs. , there will be a difference in the time it takes for the carriage 1 to start moving in a predetermined direction according to the rotation of the pulse motor 6. Moreover, when the deflection of the belt 5 becomes large, the carriage 1 with respect to the rotation of the pulse motor 6 becomes
This results in a decrease in the movement responsiveness of the recording medium, resulting in a decrease in recording quality. Furthermore, since the feed m of the belt 5 differs depending on the moving direction of the carriage 1, the load applied to the pulse motor 6 also differs.

The present invention has been made in view of these points, and
By driving the pulse motor according to the slewing table according to the rotation direction, differences in carriage movement response time caused by differences in belt deflection history are eliminated, and the carriage can move at high speed even when the belt deflection is large. It is an object of the present invention to provide a serial printer that can respond and obtain high-quality printing results.

[Means for Solving the Problems] FIG. 1 is a block diagram of the principle of the present invention, and the same parts as in FIG. 4 are given the same reference numerals. In the figure, 9 indicates the direction of rotation of the pulse motor 6 in FIGS. 2(a) and 2(b).
) is a memory in which a slewing table as shown in 1 is stored, and data read from the memory 9 is applied to the drive circuit 7. Reference numeral 10 denotes a drive control unit that controls the memory 9 to output a slewing table corresponding to the rotational direction of the pulse motor 6 from the memory 9.

[Operation] When moving the carriage 1 toward the pulley 4, the drive unit 10 determines that the pulse motor 6 is to be rotated in the forward direction, and performs a throughput operation from the memory 9 as shown in FIG. 2(a). The driving circuit 7 outputs the ing table. On the other hand, when moving the crimp ridge 1 toward the pulley 3, the drive control unit 10 determines that the pulse motor 6 should be rotated in the opposite direction, and reads from the memory 9 as shown in FIG. 2(b). The driving circuit 7 is configured to output a slewing table that is suitable for driving.

Here, when comparing the forward direction slewing table and the reverse direction slewing table, the reverse direction slewing table is set to have a higher speed than the forward direction slewing table. Therefore, when the belt 5 is moved in the opposite direction where the deflection becomes large, the pulse motor 6
The carriage 1 is driven to rotate at a higher speed than when moving in the forward direction, and the time difference in movement response of the carriage 1 caused by the difference in deflection m of the belt 5, which is conventional, is improved, and high-quality recording results can be obtained. It will be done.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a block diagram showing the main parts of an embodiment of the present invention, and shows a specific example of the drive control section 10. As shown in FIG. In the figure, 10a is an up/down counter that indicates current position data of the carriage 1, 10b is a direction determination circuit that determines the rotation direction of the pulse motor 6 based on the direction of increase/decrease in the count value of the up/down counter 10a, and 10c is a direction determination circuit that determines the rotation direction of the pulse motor 6. This is a selection signal generation circuit that outputs a selection signal to the memory 9 for selecting a predetermined slewing table from the memory 9 according to the determination signal of the determination circuit 10b.

The count value of the up-down force/kunta 10a decreases when the carriage 1 moves to the pulley 3 side, for example, and increases when it moves to the pulley 4 side. A reference position sensor is provided on the pulley 3 side, and when the carriage 1 moves to the PL reference position sensor, the count value of the up/down counter 10a is cleared.

When the carriage 1 moves toward the pulley 4, the direction determining circuit 10b detects an increase in the count value of the up/down counter 10a, determines that the rotation direction of the pulse motor 6 is the positive direction, and generates a selection signal. A forward direction discrimination signal is output to the circuit 10c. The selection signal generation circuit 10c is
In accordance with the forward direction discrimination signal, a selection signal for outputting to the drive circuit 7 a slewing table corresponding to the reverse direction rotation is outputted to the memory 9. As a result, the pulse motor 6 is driven to rotate according to the slewing table (FIG. 2(a)) in the forward direction.

When the carriage 1 moves toward the pulley 3, the direction determining circuit 10b detects a decrease in the count value of the up/down counter 10a, determines that the rotation direction of the pulse motor 6 is in the opposite direction, and generates a selection signal. A reverse direction determination signal is output to the circuit 10c. The selection signal generation circuit 10c is
A selection signal for outputting a slewing table corresponding to forward rotation to the drive circuit 7 is output to the memory 9 in accordance with the reverse direction discrimination signal. As a result, the pulse motor 6 is driven to rotate according to the slewing table (FIG. 2(b)) in the forward direction.

In the above-described embodiment, the rotation direction of the pulse motor 6 is determined based on the increase or decrease in the count value of the up/down counter 10a, which indicates the count value corresponding to the current position of the carriage 1. From the applied recording data, the moving direction of the carriage 1, that is, the pulse motor 6
Alternatively, the direction of rotation may be determined.

[Effects of the Invention] As described above in detail, according to the present invention, by driving the pulse motor according to the slewing table according to the rotation direction, the influence of belt sagging can be reduced and high-quality recording results can be achieved. We can provide a serial printer that can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention. FIG. 2 is an example of a slewing table stored in the memory of the present invention. FIG. 3 is a configuration block diagram showing the main parts of an embodiment of the present invention. FIG. 4 is an example of a conventional configuration, FIG. 5 is an example of a slewing table, and FIG. 6 is an illustration of belt deflection. 1 and 3, 1 is a carriage, 2 is a recording head, 3.4 is a pulley, 5 is a belt, 6 is a pulse motor, 7 is a drive circuit, 9 is a memory, and 10 is a drive control section. Constituent blocks showing the main parts of the present invention ■ - Hiroshi Jitsuko

Claims (1)

[Claims] A serial printer configured to move a carriage (1) on which a recording head (2) is mounted by a pulse motor (6), a pulley (3), and a belt (5), the pulse motor ( 6) a memory (9) storing a slewing table corresponding to the first rotation direction and a slewing table corresponding to the second rotation direction; and a slewing table corresponding to the rotation direction of the pulse motor (6). Select from memory (9) and select pulse motor (6)
A serial printer, comprising: a drive control section (10) that outputs an output to a drive circuit (7), and the pulse motor (6) is driven according to a slewing table according to a rotation direction.