JP2002052775A - Printing controller for dot line printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a rotary encoder for detecting a shuttle position to control a velocity of the shuttle and to generate a hammer-driving timing is conventionally required to be adjusted in mounting position in order to match a relation between the shuttle position and a home signal of the rotary encoder when a printer is assembled, with causing a cost increase. SOLUTION: The home signal of the rotary encoder is changed synchronously with a position signal of the rotary encoder by a home signal position-changing means, thereby eliminating an adjustment work when the printer is assembled and reducing a man-hour for the adjustment work. A deviation between the shuttle and the home signal is judged from the printing result by printing with lowering a velocity of the shuttle, thereby enabling the adjustment work after the assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing control device for a dot line printer.

[0002]

2. Description of the Related Art Conventionally, the speed control of a shuttle motor is controlled using a home signal of a rotary encoder and a position signal. The shuttle motor does not always rotate at a constant speed, but is controlled so that the rotation speed changes depending on the shuttle position. Also, the hammer drive timing,
It is generated based on the home signal of the rotary encoder and the position signal. If the mounting position of the rotary encoder is misaligned, accurate shuttle position detection cannot be performed, and accurate shuttle motor speed control and hammer drive timing generation cannot be performed.
The home signal of the sensor is output when the shuttle is at a predetermined position.

[0003]

In the printing control of the conventional dot line printer, the mounting position of the rotary encoder is adjusted in order to match the home signal of the linear encoder mounted on the shuttle motor with the positional relationship with the shuttle. However, there is a problem that the cost is increased due to an increase in the number of adjustment steps. There is also a problem that adjustment after assembly cannot be performed.

[0004]

In the printing control apparatus for a dot line printer according to the present invention, the home signal from the rotary encoder is shifted back and forth in synchronization with the position signal, so that the adjustment of the rotary encoder mounting position can be easily performed. Be able to do it. In addition, by printing at a reduced shuttle speed, it is possible to easily determine the amount of displacement of the mounting position of the rotary encoder from the printing result.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

A rotary encoder 1 is mounted on a motor shaft of a shuttle motor (not shown) for driving a shuttle mechanism (not shown).
When rotated, N position signals and one home signal are output. The home signal is changed by the home position changing means 2 to a position synchronized with the position signal. The home position changing means 2 includes a home position change amount holding means 3, a counter 4, and a comparator 5. The counter 4 counts the position signal, and sets the count value to 1 by the home signal. The position signal when the home signal of the rotary encoder is output is set as the first position signal, and the position where the home signal after the change is output by the home position changing means is set as the home position of the position signal of the rotary encoder. The output of the counter 4 is held by the change amount holding means 3 and the home position change amount held by the home position change amount holding means 3 is compared by the comparator 5, and a home signal is output when they match. I do. Using the changed home signal and the position signal of the rotary encoder, the shuttle speed is controlled by the shuttle speed control means 6, and the hammer drive timing generation means 7 generates the hammer drive timing.

FIG. 2 is a timing chart of an embodiment of the present invention.

In this embodiment, assuming that the home signal is output when the shuttle is at the right end position, the shuttle speed is controlled by the shuttle speed control means 6, and the print timing generation means 7 similarly controls the print timing. Is generated. The shuttle speed control and hammer drive timing have data of timing for executing phase switching of the shuttle motor and data of timing for creating hammer drive timing for each position signal,
Phase switching of the shuttle motor after t1 seconds from the position signal of the home signal (first position signal), phase switching of the shuttle motor after t2 seconds from the next position signal of the home signal (second position signal), and hammer after t3 seconds. The drive timing is controlled so as to be generated.

This timing chart shows an example in which the N-th position signal is output when the position of the rotary encoder is shifted and the shuttle is at the rightmost position.

In the home position adjustment according to the present embodiment, first, the shuttle speed is reduced to execute printing in which the position signal substantially matches the print position. The print pattern at this time is a print pattern that is printed at the same position when the shuttle moves from the right end to the left end and when the shuttle moves from the left end to the right end. For example, the hammerbank position when passing the n1 position signal when the shuttle moves from the right end to the left end is the same as the hammerbank position when passing the n2 position signal when moving from the left end to the right end. If it is a position, the print pattern to be printed is printed using the timing generated by both position signals, and the difference between printing when the shuttle moves from the right end to the left end and printing when the shuttle moves from the left end to the right end Is set in the home position change amount holding means so that is minimized. At this time, if the shuttle speed is sufficiently low, the time from the passage of the position signal to the print timing generated by the hammer drive timing generation means and the flight time of the hammer can be ignored, and the print positions are n1 and n2. This is the position where the position signal is output. The required home position change amount is determined from the shift amount of the printing position at this time, and is set in the home position change amount holding means from an operation panel (not shown) or the like. In the example of the timing chart of FIG. 2, N is set.

The home position change amount holding means outputs a home signal when the Nth position signal of the rotary encoder comes, and the shuttle speed control means and the hammer drive timing generation means use the changed home signal. By controlling the position signal of the position where the home signal is output as the first position signal, it is possible to perform control suited to the actual position of the shuttle.

[0013]

According to the present invention, the mounting of the rotary encoder can be made non-adjustable, and the man-hour for assembling and adjusting can be reduced. Adjustment is possible even after assembly.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a timing chart of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotary encoder, 2 ... Home position changing means, 3
... Home position change amount holding means, 4 ... Counter, 5 ... Comparator, 6 ... Shuttle speed control means, 7 ... Hammer drive timing generation means.

Claims (1)

[Claims] A hammer mechanism mounted with a plurality of hammer pins and reciprocating in a row direction; a shuttle mechanism for reciprocating the hammer mechanism; a motor for driving the shuttle mechanism; A rotary encoder attached to the shaft, shuttle speed control means for controlling the speed of the shuttle, and hammer drive timing generation means for generating the drive timing of the hammer; a position signal indicating the position of the rotary encoder; In a dot line printer that uses the reference position signal (home signal) indicating the reference position to control the speed of the shuttle and generate the drive timing of the hammer, the home signal position change that changes the home signal of the rotary encoder in position signal units Means for controlling the home signal by the home signal position changing means. The position is changed, the speed of the shuttle drive motor is controlled using the changed home signal, and the hammer drive timing is generated.The amount of change in the home signal position is determined by lowering the shuttle speed and printing. A print control device for a dot line printer, wherein an operator sets a home signal position change amount such that a shift of a print position due to a difference in a moving direction of the shuttle is minimized.