JPS58107383A - Controlling system of printing - Google Patents

Abstract

PURPOSE:To completely prevent the bias of digits by a method in which, when no next printing command is given even after the lapse of a certain time after printing end signal is sent out of a printer, a printing head is automatically restored to its initial position by a circuit. CONSTITUTION:In a printing control mode for a printer in which printing is made while moving the printing head by a pulse motor controlled by an open loop, and when the printing of given printing data is completed, the printing head is stayed at the final printing position, a monostable-multivibrator MS is actuated when a series of printing operations is ended, and when no next printing command ST is generated even when a set time T is elapsed, an initial operation signal INT1 is generated from AND gate G1 when next printing command comes. By the signal, signal INT is generated from OR gate G2 and the printer PR is put into an initial operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of interposition of the invention The present invention relates to a print control system for a printer, and for example, an open-loop system that does not have a head position feedback system.
This is an attempt to prevent the occurrence of digit misalignment in printers that drive the print head with a controlled pulse motor.0 (2) Background of the technology In dot printers that print by receiving print data from a central processing unit, While moving the print head in the lateral direction, that is, in the direction perpendicular to the paper feeding direction, the pins specified by the print data in the plurality of print bins of the armpit head are projected to print. When a pulse motor is used as the drive source for the print head, the amount of rotation per step, and therefore the amount of movement of the print head, is determined with high precision, so the head can be driven only by open-loop control without position feedback. This type of printer is broadly divided into incremental mode (11), which starts printing immediately when it receives print data, and line mode (11), which stores one line's worth of print data in line buffer 1 and starts printing after receiving a print command. However, with either type, the print head is often kept at the final print position, and this method allows the print head to be moved to the next print start position in the shortest distance (for example, from the current stop position to the next line). The beginning of

Move the head closer to the end and hit to the right or left,
Or print the next print data following the current line, etc.
II), etc.

(1) Figure 1 shows a schematic configuration of a conventional line printer. In the figure, 1 is a platen, 2 is a print head, 6 is a carrier carrying an armpit head, 4 is its axis of movement, and 5 is a pulse motor that rotates the scissor shaft.

When the pulse motor 5 is driven, the shaft 4 rotates and KIl
*1. The carrier 3 moves in parallel to the right or to the left in the figure according to the rotational direction of the motor 5. The print head 2 is a pin type in which a large number of pins are arranged in one or two vertical rows, and an ink ribbon and a print head (not shown) are passed between the head and the platen 1. The paper is fed 9 by the rotation.

The amount of movement of the print head 2 during the printing operation is controlled by the pulse motor 5). The current position of the cough head (the printing position l) can be accurately grasped by determining how many steps the pulse motor 5 is rotated from the printing start position.

However, when the power to the pulse motor 5 is cut off, the
can be moved by an external force, so conventionally, in order to ensure that the print head 2 stops at the final printing position, the motor 5 is excited and locked, or a position feedback system is provided and, for example, a slit is inserted into the moving shaft 4. Fix the disk 6 and make the cough slit disk 6.
Countermeasures are taken to detect the current position of the head 2 by detecting the pulses generated by the armpits with a counter and by detecting them with the optical seventh-inner 7. However, with both locking methods, the nozzle motor 5 is
Power consumption is high because it is constantly energized, and the operator has to turn on Head 2 when replacing paper or ink ribbon! Even if I try to move it to a position that does not interfere with & (
In a dot printer, the distance between the head and the platen is a very small value within 1 minus the inside and outside). The latter feedback method does not lock, so the head can move freely! 1, and when the head is moved, the sensor 7 generates a pulse and increases or decreases the counter needle value, and the head i
Since the A position information is corrected, there is no problem with head movement or digit shift, but there is one point that inherently requires the use of a complex feedback system for a pulse motor drive system that is 1111i high and can be controlled in an open loop. be.

(4) *Purpose of the present invention The present invention does not lock the print head at the final printing position, but only '4h? This is an attempt to prevent the occurrence of digit shift without using an I4 feedback system.

(5) Structure of the Invention The present invention performs printing while moving the print head using a pulse motor controlled in an open loop, and keeps the print head at the final printing position when the given print data is printed. In the printer's print control system, a circuit is installed that allows the company's print head to freely return to its initial position when the next print command is not given even after a certain period of time has elapsed since the scissor printer sent out the print end signal. It is characterized by this.

(6) Embodiments of the Invention From now on, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 12 is a configuration diagram showing an embodiment of the present invention, and FIG. 6 is an operational waveform diagram thereof. In Figure 2, C0N
T is a control device, and PR is a dot printer. Normally, an initial operation signal INT is given to the printer PR from the control device C0NT when the power is turned on, and this causes the print head 2 to return to the initial position where the sensor 8 is installed as shown in the printer PR1iNE1 diagram. Thereafter, in the line mode, one line of print data is accumulated from the control device C0NT in the unillustrated line/buffer of the printer PR, and then
When the print command 8T is given, the printer PR starts, moves the print head 2 from the initial position to the specified print start position, and starts printing from there according to the print data. When printing for one line is completed, a printing end signal RD is sent.
Returns Y (ready) to the control circuit C0NT. When the control circuit C0NT receives the print end signal RDY, it sends the print data for the next line, and when the data is accumulated in the line buffer, it sends the print command 8T again. 0 The paper is moved by one line each time each line is printed. A paper feed operation is performed to ensure line spacing. Specifically, the print command ST is a CR toe 9 carriage return. For CR, input the next print data from the first column, and also start a line feed (LF second line feed).
Therefore, if you input ABCCR and then input 1230R, ABC will be printed on the paper, and then a line break will be made (the paper will be fed) and 125 will be printed on the next line. If you want to print MUBC with MUBCCR and then print 126 on the same line, use the space code Utt.
It is used to make 1jU%-71230R. This is for Jf
tK is printed as MU1C125. In this case, CR does not have the meaning of line feed (paper feed), but only means that the next print data should be printed from the first column. In any case, the print head remains at the final print position, and it does not move to the first stroke until the next print data arrives and a print command is input.

A large amount of print data is printed by repeating this operation nine times, and the print head moves rapidly during printing. It is highly unlikely that the operator manually moves the print head during this printing. However, during the operation stop period after a series of printing operations is completed and until the next printing command ST is issued, the operator can initiate, replace the printing ribbon,
It is possible that the print head may be moved from its final printing position for other reasons. Therefore, the monomulti MS is activated with the print end signal RDY, and the next print command 8 is issued within the set time T.
Monitor whether ding occurs. Since it usually takes more than 1 minute to replace paper, this setting time T should be, for example, 10 seconds or more.
It takes about 1 minute, which is much longer than the normal printing interval (on the order of milliseconds). Therefore, time 1 after the end signal RDY is generated.
If the next print command 8T occurs within that time, it is determined that there is little possibility that the print head was manually instructed during that time, and the print operation in the printer PR is fIA-controlled. On the other hand, even if the set time T of the monomulti Mli has elapsed, the print command 8
When no printing occurs, an initial operation signal INT is generated from A/TGE) Gs when a printing command for training arrives. G is an OR gate, and its output INT is the initial operation signal INT when the power is turned on, or goo)
This is the initial operation signal lNTl from Gt.

When the printer PR receives the initial operation signal INT, it outputs INT even if it is due to INT.

0 performs the initial operation in the same way as 0. Therefore, 51 in Fig. 6
The printing based on the g1th printing finger 4#81 is different from the 12th printing, and an initial operation is performed before that. After that, the print head is once returned to its initial position, then moved to the designated nine print position, and printing is started from there. The current position of the print head (not the actual position, but the expected position) is known on the printer side, so when returning to the initial position, the printer advances the head from the cough initial position to the above current position.
It can be restored. If the next print data is to be printed on a new line, there is no need to return to the original position, and it is sufficient to simply print from the next line (paper feed) designated position, for example, the first column. In this way, even if the head is moved while printing is stopped and the stop position is no longer the final printing position, it will be corrected by initialization and no digit shift will occur.

(Effects of the Invention As mentioned above, according to the present invention, the pulse motor is not excited and locked while the print head is stopped, so power consumption is reduced, and the print head can be moved freely by manual operation, so the paper It is convenient for replacement, etc. It is also inexpensive because it does not use a feedback system to constantly check the head position, and if there is a possibility that the print head has been moved manually, it is easy to adjust to start the next print. Since the head is returned to the initial position and the position is confirmed by the initial position detection system, no digit shift (shift in the direction of movement of the print head) occurs.

[Brief explanation of drawings]

FIG. 11 is a schematic diagram of a conventional dot printer, FIG. 2 is a configuration diagram showing an embodiment of the present invention, and FIG. 3 is an operational waveform diagram thereof. In the figure, 2 is a print head, 5 is a pulse motor, PR is a printer, and M8 is a monomulti. Applicant Fujitsu Limited

Claims (1)

[Claims] In the printer's print control system, printing is performed while moving the print head using a nox motor that controls the scales in an open loop, and the print head is kept at the final print position when printing of the given print data is completed. The turtle has installed a circuit that automatically moves the print head to the initial position if the next print command is not given even after a certain period of time tg has elapsed since the printer sent out the print end signal. **Printing control method.