JPS5862066A - System for controlling movement of printing head - Google Patents

Abstract

PURPOSE:To make it possible to print characters without digit shifting, by providing a printing direction memory means wherein the printing direction is stored, and moving the head in the reverse direction with respect to the direction stored in the printing direction memory means when a head return is commanded. CONSTITUTION:A paper feed control circuit 5 controls a gear motor system 10 in compliance with the command from an interface control circuit 1, rotates a platen 12, and moves paper 11. A print control circuit 6 sequentially reads dot patterns of a line buffer and controls the dot pins of a head 13, when the printing is commanded by the interface control circuit 1. At the same time, the print control circuit 6 starts a reverse direction head movement control circuit 7. Said control circuit 7 moves the head 13 in the direction specified by the starting signal from the print control circuit 6. When the control circuit 7 receives the head return command from the interface control circuit, the circuit 7 moves the head in the reverse direction with respect to the direction specified by a moving direction register 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for adjusting digits in the vertical direction when printing characters of n dots in the vertical direction using a dot printer having m bin heads. This relates to the necessary unidirectional printing control.

As shown in Figure 1, a method of printing 16 vertical dots of Japanese using an 8 or 9-bin head is to print the upper and lower halves of the Japanese language twice over K twice. It is being In this case, the -th printing direction and the 2nd
If the printing direction is different from the first printing direction, problems such as digit misalignment will occur due to the accuracy of digit alignment.

For this reason, conventionally we have specified unidirectional printing, and
A method is used in which the printing direction is always printed from the left direction. This type of conventional printing control system has the disadvantage that there is a lot of unnecessary head movement without printing, and printing efficiency cannot be improved.

The present invention eliminates the above-mentioned drawbacks, and when printing a character with n dots in the vertical direction (n:>m) using a dot printer having an m-dot bin head,
It is an object of the present invention to provide a print head movement control system that can reduce unnecessary head movement as much as possible. Therefore, the print head movement control method of the present invention is implemented in a nine-dot printer device that includes a paper feeding mechanism, a printing mechanism, a mechanism control circuit, and an interface control circuit.
A print direction storage means for storing the movement direction of the print head during printing operation and a movement control means for returning the head in the opposite direction to the memorized direction are provided, and when a print command is issued from the host side, the printer side prints. When the direction is stored in the printing direction storage means and a command to return the head is issued from the host side, the movement control means is activated, and the direction stored in the printing direction storage means and the direction stored in the printing direction storage means are controlled by the movement control means. The printer is characterized in that the head is moved in the opposite direction.The present invention will be explained below with reference to the drawings.The second figure is a diagram showing an outline of the printer, and the third figure is a first diagram of the present invention. A block diagram of the embodiment, FIG. 4 is a diagram showing an overview of head movement, and FIG. 5 is a block diagram of the embodiment.
The figure shows an example of printing. Reference numeral 2 indicates a mechanical control circuit, 3 indicates a paper feeding mechanism, and 4 indicates a printing mechanism.

The interface control circuit 1 decodes commands and exchanges data with the host side. Examples of commands include carriage return OR, line feed LP, and head return. When a carriage return OB is sent, the head is always moved to the left if one direction is specified, and then when a 0 line feed LF is sent that prints from left to right. , the O head return command, which performs a line feed, moves the head once to the left if one direction is specified, and then prints from left to right, was newly established especially for the present invention. It is something. The information to be printed is sent from the host to the printer in the form of image dot patterns rather than character codes. The mechanical control circuit 2 controls the paper feeding mechanism 3 and the printing mechanism 4 according to instructions from the interface control circuit 1, and returns status and the like to the interface control circuit 1.

FIG. 3 is a block diagram of one embodiment of the present invention. In FIG. 3, 5 is a paper feed control circuit, 6 is a print control circuit, and 7 is a block diagram of an embodiment of the present invention.
8 is a reverse direction head movement control circuit; 8 is a movement direction register;
9 is the head moving motor system, 1G is the gear motor system, 1
Reference numeral 1 indicates paper, 12 Fi platen, 13 a head, and 14 a wire for moving the head.

The paper feed control circuit 5 controls the gear motor system 10 according to instructions from the interface control circuit 1, and controls the platen 12.
The paper 11 is moved by rotating the paper 11. Also,
When the paper is about to run out, the paper feed control circuit 8 notifies the interface control circuit of the paper end. When the print control circuit 6 receives an instruction to print from the interface control circuit 1, it sequentially reads dot patterns from a line buffer (not shown), thereby controlling the dot bins of the head 13. , At the same time, the print control circuit 6 activates the reverse direction head movement control circuit 7. When the reverse head movement control circuit 7 receives the activation signal from the print control circuit 7, it activates the head movement motor system 9 to move the head 13 in the direction specified by the activation signal. In addition, the reverse head movement direction control circuit 7
When receiving a head return instruction from the interface control circuit 1, the head moving motor system 8 is controlled to move the head in a direction opposite to the direction specified by the moving direction register 8. The movement direction register itself stores the printing direction, and the printing direction is notified from the printing control circuit 6'. Note that the printer to which the present invention is applied has a forward/reverse automatic judgment function, and checks the character printing start position of the line buffer, the character printing end position of the line buffer, and the current head position, and determines the head movement. It also performs printing. The head moving motor system 9 rotates a motor in the forward or reverse direction to move the head moving wire 14. A gear motor system 10 rotates the platen 12. When the platen 12 rotates, the paper 11 moves in the vertical direction. FIG. Printing is performed while moving from left to right, and when there are no more image dot patterns to be printed, the head 13 stops. At this time, since the printing direction is from left to right, this fact is stored in the movement direction register 8. When the host side issues a head return command, the head 13 moves in the opposite direction to the direction stored in the movement direction register 8. When the head is located at the right end (K), when printing start is commanded, the head 13 performs printing while moving from right to left, and when there is no more image dot pattern to be printed, the head 13 stops. At this time, the moving direction register 8 stores that the printing direction is from right to left. When a head return is commanded, the head 13 moves in the opposite direction to the direction stored in the movement direction register 8.

FIG. 5 shows an example of printing. ``Today, the image dot pattern of the upper half of the string is sent from the host to the printer, and the line
stored in a buffer. After transferring the image dot pattern, the host side sends a line feed LP to the printer. When the printer receives the line feed LP, it will display the message ``It's nice weather today.''" is printed in the upper half of the string. In the illustrated example, this printing is performed from left to right. After sending out the line feed LP, the host side sends out a head return.

Then, the head is returned to the left end. After sending the head return, the host side says, ``The weather is nice today.''
The image dot pattern of the lower half of the character string is sent to the printer. Needless to say, this image dot pattern is not stored in the line buffer. After sending out this lower half image fist dot pattern, the host side sends a line feed LP to the printer. Upon receiving this command, the printer prints the image dot pattern of the lower half of the string "It's nice weather today." This printing is done from left to right.

After the character string ``It's nice weather today.'' is printed, the host side sends an image dot pattern of the upper half of the character string ``Yesterday was rainy.'' to the printer. After sending this image dot pattern, the host side sends out a line feed. Upon receiving the line feed, the printer prints the first half of the string "It rained yesterday." This printing is done from right to left. After this printing is performed, the host side sends out a head return. Then, the head is returned to the right end. After the head is returned to the right edge, the host side displays the image dots in the lower half of the string ``It rained yesterday.''
Send the pattern to the printer. After sending this half image, dot, ) C turn, the host side sends a line feed to the printer. Upon receiving this command, the printer prints the lower half of the string ``Yesterday it rained.'' This printing is performed from right to left, and the same operation is repeated over and over again.As is clear from the above explanation, according to the present invention, a new command called head return is added, and the printing direction is changed. A printing direction storage means for storing the printing direction and a head.
When a return is commanded, the printing direction storage means is configured to move the head in the opposite direction to the direction stored in the print direction.Thus, compared to the conventional method, unnecessary movement of the head is prevented, and the printing direction is It is possible to print characters without deviation.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining a method of printing 16 dot characters using a printer with 8 or 9 bin heads, Fig. 2 is a diagram showing an outline of the printer, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a diagram showing an outline of head movement in the present invention, and FIG. 5 is a diagram showing an example of printing according to the present invention. 1... Interface control circuit, 2... Mechanical control circuit, 3... Paper feeding mechanism, 4... Printing mechanism, 5...
Paper feed control circuit, 6... Print control circuit, 7... Reverse direction head movement control circuit, 8... Movement direction register, 9
... Head movement motor system, 10 ... Gear motor system, 11 ... Paper, 12 ... Platen, 13 ...
Head, 14... Wire for head movement. Patent Applicant Fujitsu Ltd. Representative Patent Attorney Kyotani Shibuya 1 Figure

Claims (1)

[Claims] In a dot printer device equipped with a paper feeding mechanism, a printing mechanism, a mechanism control circuit, and an interface control circuit,
A print direction storage means for storing the print-to-rad movement direction during printing operation and a movement control means for returning the head in the opposite direction to the memorized direction are provided, and when a print command is issued from the host side, the printer side When the printing direction is stored in the printing direction storage means and a command to return the head is issued from the host side, the movement control means is activated, and the printing direction is stored in the printing direction storage means under the control of the movement control means. A print head movement control system characterized in that the head is moved in a direction opposite to the nine directions in which the print head is moved.