JPH0339282A - Printer - Google Patents

Abstract

PURPOSE:To eliminate the variation of a page length even when a paper width changes and to perform the rule connection with the next line by eliminating an actual printing data memory region (image buffer) according to the paper width in the moving direction of a carriage detected by a paper width detector. CONSTITUTION:When the width 11 of paper 300 is equal to or larger than a scheduled printing width 8, data is transmitted to a head driving control part according to the content of an image buffer 301. When said paper width 1 is smaller than the printing width 8, the left and right of the image buffer being actual printing data are respectively eliminated according to the detection result of a paper width detector. For example, when a paper width 6 is narrow and paper is small by 10 dots on the left side thereof and scheduled printing data is printed from the left to the right, data is transmitted to the head driving control part from the data right I by 10 bites from the address 311 of the image buffer 301 shown by a drawing. When the paper is small on the right side, the transmission of data is stopped at the part of the address II being the eliminated result. By this method, the variation of a page length is eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] A paper feed motor (hereinafter referred to as PF motor) driving means for feeding the paper, and a paper width detection means for detecting the width of the paper. The present invention relates to a printer that changes the printing area in the direction of carriage movement according to the result of the means.

[Prior art] In conventional printing devices, for example, Japanese Patent Application Laid-Open No. 62-234975
As shown in the issue, the print area was determined by changing the left and right margins based on the results of the paper width detector.

[Problem to be Solved by the Invention] However, in the above-mentioned prior art, the paper 1 to be actually printed (101) is
If the width of 00 is small, the part that cannot be printed will move to the next line, so the planned number of lines will increase (Figure 4 (b)), and as a result, the number of lines to be printed on - sheets of paper will be less than C. , page length. ) changes, and when printing a ruled line, the positional relationship with the next line becomes incorrect, making it impossible to connect in the vertical direction.

Therefore, the present invention solves these problems, so
The purpose of this is to eliminate fluctuations in page length even if paper width changes, and to enable ruled line connection with the next line.

[Means for Solving the Problems 1] The printer of the present invention uses a data area for printing (hereinafter referred to as image buffer) secured in PAM inside the printer according to the paper width measured by the paper width detector. It is characterized by deleting both the left and right sides.

(Function 1) According to the above configuration of the present invention, the number of printed lines does not change even if the paper width changes, so fluctuations in page length are avoided, and ruled line connection with the next line becomes possible.

[Example] FIG. 1 is a diagram showing the configuration of the present invention.

The printer inventory device exchanges data with an external host computer 14 via an interface (1/F) control unit 13. Print control and line feed control commands and print data are sent from the host computer. It's coming. These pigs have I/F part l:3 or RA
It is temporarily stored in M4. A CP IJ 2 is connected to the I/F section 13 via an address data bus 8. C.P.
U2 is connected to the ROM 5 via the address data bus 8, and according to the control program in this ROM 5, prints (distributes), analyzes the accumulated data according to the control program, and the CPU 2 addresses each driving part 0 control. The CI]lJ2 controls the drive of the carriage (CR) motor 7, which carries the head 9 and moves in the horizontal direction relative to the paper, via the CR motor control unit 6, and controls the drive of the head 9 via the data bus. RA that drives the PF motor 12 via the PF motor control unit 11 via the drive control unit 1O.
An area for an image buffer is secured in M4.

This image buffer is the subsequent data for printing, and a bit of data corresponds to one bin of the head. The CPU 2 receives R via the address data bus 8.
This data is taken out in order from within the AMJ and is sent to the head drive control section 10 from the CPtJ2 via the address data bus 8 again. Head drive control unit lO
Then, this data is latched, and according to this data, for example, if a bit in the data is set, that bit is interpreted as indicating that printing is to be performed, and the head 9 is opened to print.

The paper width detector 3 is composed of a photo sensor, etc., and can determine the presence or absence of paper, and is mounted on the paper path of the printer body or next to the print head.
This patent is not limited by the structure and location of the paper width detector.

Prior to printing control or sequentially during printing, the paper width is detected by a paper width detector. The results are stored in the RAM 4 and referenced when printing so that the print results fit within the paper width.

FIG. 2 is a diagram showing an example of the structure of an image buffer 201 of a dot matrix printer in which characters are composed of a plurality of dots 200. In FIG. 2, an example of a matrix of 8 dots is shown. ) is printed on the left edge with an 8-pin dot matrix printer, it is developed in the image buffer as shown in FIG. 2(b). In other words, the data in /' is broken up into 1-byte byte groups. The data is stored in order starting from address 211 of the buffer. It doesn't matter which address is 211 or 212, whichever is lower or 6 is higher. When printing from left to right, this data is taken out in order from address 211 and transferred as it is to the head drive control unit connected to the head, and is latched in the control drive unit. Ru. In other words, data is read in the order it was stored. On the other hand, when printing from right to left, the data are taken out in order starting from address 212.

In other words, if data is retrieved from the stored end, or if, for example, 5 dots are added to the left space, 5 bytes of space data (ooh) are added to the image buffer from address ■ (Figure 2 (c) )), when printing, data is taken out in order from address ■ in the same way as above.

FIG. 3 is a diagram showing an embodiment of the present invention.

The paper size was 30 mm for the planned print width of 8 (Figure 3 (a)).
If the paper width 11 of 0 is equal or larger, the data is transferred to the head drive control unit according to the contents of the image buffer 301 (Fig. 3(b)); if it is smaller, the image buffer containing the actual print data is transferred. Delete the left and right sides respectively according to the detection results of the paper width detector. For example, if the paper width 6 is narrow and the left side is 10 dots smaller, and the planned print data is as shown in FIG.
Data is transferred to the head drive control section from the data of the right byte I. In addition, if the right side is small, data transfer can be stopped at address 11, which is the result of deletion. The print result obtained when performing such print control is shown in Figure 3 (d). show.

On the other hand, when printing from right to left, if the right side is smaller than the planned printing width, from the direction of address 312
You can start from address 1■, which is where the address is moved back by a smaller width. If the left side is smaller, data transfer is stopped at address I, which is the result of deletion.

[Effect of the invention J As described above, according to the present invention, by deleting the image buffer according to the result of the paper width detector, the paper width changes but the 6 page length does not change, and the difference between the next line and Ruled line connections are possible.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the present invention. FIG. 2 is a diagram showing the structure of an image buffer. FIG. 3 is a diagram explaining the present invention. FIG. 4 is a diagram showing conventional printing results. printer control device P.U. paper width detector A.M. OM I:) ゛Huff 11.18p1! 1st figure of (b) Figure 2 3n ■312 (d) Figure 3 Chapter 4:1

Claims (1)

[Claims] The carriage on which the print head is mounted is a carriage (CR).
) A means for printing characters, etc. on paper by reciprocating the paper in a direction perpendicular to the paper feeding direction by a motor, a means for feeding the paper by means of a paper feed (PF) motor drive means as necessary after the printing operation, and a means for transferring the actual print data. In a serial printer having a storage means and a paper width detection means for detecting the paper width in the carriage movement direction, actual print data is stored according to the paper width in the carriage movement direction detected by the paper width detector. A printer characterized by deleting an area (image buffer).