JPS60180865A - Printer - Google Patents

Abstract

PURPOSE:To make printing on exact positions of a paper by a method in which the paper is once moved by a given distance to the opposite direction prior to the starting of printing and then moved to the normal direction. CONSTITUTION:Printing is made to a given section on a continuous paper, and then the printed paper is tensed and cut or not cut. In this case, when the paper is fed and printing is made on the first line, the printing position of the first line is different because of the backlash between the sprocket pin of the tractor and the feeding hole of the paper. To prevent said phenomenon, the printing paper is once fed reversely and then fed normally for a given distance for printing.

Description

Detailed Description of the Invention: FAT81 Field of the Invention The present invention relates to a media feeding system in serial printers such as dot-blink, ink, and type printers, and in particular to a blinking method that can ensure printing position accuracy for the first line of continuous paper. Regarding equipment.

Tb) Technical Background Recently, serial printers have been developed as office machines such as terminals for various computers and word processors.

It has been put into practical use.

These printer devices use continuous paper and single sheets as printing paper.

Continuous paper is used by setting a paper feed hole in a sprocket bin of a media transporting unit and winding it around a platen through a vapor guide.

Also, the cut sheet is used by being guided by a vapor guide directly from the rear of the platen and wrapped around the platen, or in a printer equipped with a front insert, a person is used for this purpose.

The present invention is applied to printing on continuous paper, and in this case, the interval between the first and second lines tends to become narrower, so a method for properly ensuring this is desired.

(CL Prior Art and Problems) Hereinafter, the conventional method will be explained using a wire tod printer as an example with reference to FIG. 1, FIG. 2, FIG. 3 + al and Tbl. FIG. 2 is a side view of FIG. 1, and FIG. 3 (al and bl are explanatory views of FIG. 1).

As shown in Figure 1, the platen 2 is attached to the side frame l.
is rotatably supported, and a knob 2a is provided at the end of the shaft of the platen 2. A printing paper 3 is wound around the platen 2, and the printing paper 3 is sent in the direction indicated by the arrow in the figure by a tractor 4, which will be described later.

At the bottom of the front view of the platen 2, a carrier 5 is slidably fitted into a guide shaft 6 provided parallel to the platen 2; It is screwed together with the feed screw 7 U7.

The feed screw 7 is connected to a space motor 9 via a belt 8 or the like, and therefore, the feed screw 7 can move the carrier 5 in the directions of arrows C and D in the figure by the forward and reverse rotation of the space motor 9.

An ink ribbon cassette 10 is mounted on the carrier 5, and an endless ink ribbon 10a is built into the ink ribbon cassette 10 with a part thereof exposed to the platen 2 side.

Further, a print head 11 is surrounded by an ink ribbon cassette 10 in the carrier 5 and is installed facing the platen 2 with a gap in between. A printing magnet is installed LJ.

Also, as shown in Figure 2, the platen 2 installed on the left side
A vapor guide 12 is arranged from the bottom to the rear,
Pressure l cola R1, R presses the printing paper 3 by coming into contact with the platen 2 through a square window provided in the vapor guide 12.
2 is provided.

A pressure roller R3 is provided in contact with the upper left part of the platen 2, and presses the printing paper 3 so that it does not loosen.

Further, a tractor 4 is provided behind the platen 2.

The tractor 4 consists of a sprocket coil 42 equipped with a sprocket pin 41 on its outer periphery.
A feeding hole for the printing paper 3 is set in the position, and the printing paper 3 is transported in forward and reverse directions by being driven by a drive source (not shown). At this time, the platen 2 also rotates in the transport direction in conjunction with the drive of the tractor 4.

With such a configuration, when the print head 11 shown in FIG. 1 operates, the printing wire of the printing magnet collides with the printing paper 3 on the platen z via the ink ribbon 10a, and printing is performed. Hesod 11 is carrier 5
At the same time, printing is performed on the printing paper 3 while moving in the direction of the arrow.

When printing for one line is completed, the platen 2 is driven to feed a line feed, and the printing paper 3 is transported in the direction of arrow A by a predetermined feed amount.

The print head 11 continues printing while moving in the direction of arrow C.

When the printing for one page is completed, the printing paper 3 is sent out for a page break, and is sent to the printing start line position of the next page, and printing is continued from that position.

For line breaks and page breaks, the tractor 4 is driven based on the specified line spacing of two lines and the size of the printing paper 3, and the necessary feed amount is commanded from a control section (not shown).

At this time, the sprocket pin 41 and the feed hole 3 of the printing paper 3
As shown in Fig. 3 fa), the front part of the sprocket pin 41 is in the state of being engaged with the feed hole 3a and being fed in the direction of the arrow, and the front part of the sprocket pin 41 is in the feed hole 3a.
is in contact with the front of the

However, when the printing of one document on the printing paper 3 is completed and the operator pulls the printing paper 3 by hand and cuts it from the perforation, the printing paper 3 on the platen 2 and the tractor 4 is pulled and slightly Shift in the way forward. That is, the positional relationship between the sprocket pin 41 and the feed hole 3a is shown in FIG.
As shown in b), the feed hole 3a is shifted in the direction of the arrow, and the rear part of the feed hole 3a is in contact with the rear part of the sprocket pin 41.

If you start printing the next document in this state, it will be printed in a shifted position, and when the first line finishes printing and the second line is started, the sprocket pin 41 moves forward due to the rotation of the sprocket wheel 42. The printing paper 3 is fed after reaching the state shown in FIG. 3 (al).

Therefore, even if the sprocket wheel 42 rotates, the printing paper 3 is not fed until the sprocket pin 41 has advanced by the difference in diameter between the sprocket pin 41 and the hole 3a. That is, there is a drawback that the spacing between the first and second lines is narrow due to backlash, and the spacing between the second and subsequent lines is uneven, which impairs the aesthetic appearance of the printed text.

(d1 Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and is to provide a printer device that can maintain the stacking density of the first line of continuous paper by 61 degrees and improve the quality of the printed text. is to provide.

te+ Structure of the Invention The present invention provides a print medium in which a medium transport unit is driven in a predetermined amount in the reverse direction and in the forward direction before starting printing based on a print start command signal that instructs printing of a predetermined document on the print medium. The present invention is a printer device equipped with a correction means, thereby achieving the purpose.

ff) Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. FIG. 4 is a Zoroku diagram showing an embodiment of the present invention, FIG. 5 is an explanatory diagram of FIG. 4, and FIG. 6 is a border 2 chart of FIG. 4. The same reference numerals refer to the same objects throughout the design.

In FIG. 4, 13 is a print line feed control circuit, 14 is a line feed counter, 15 is a correction control circuit, ]6 to 18 are drive circuits, and 19 is a line feed motor (not shown).

The print line feed control circuit 13 is a drive circuit 1 that receives print data a sent from the outside and drives the print head 11.
6. It has a function of controlling the drive circuit 7 for driving the space motor 9 and the drive circuit 8 for driving the line feed motor 19 to perform printing operations, and is equipped with a line feed counter 14 for line feeds. , sends a drive command specifying a predetermined feed amount to the drive circuit 18 for each line counted by the line feed counter 14, and also stores the specified number of lines to be printed on one page, and the number of lines counted by the line feed counter 14. When the specified number of lines is reached, a page break drive command signal is sent to the drive circuit 18. When a print start command signal is input by operating a print drive start button (not shown),
Temporarily suspends sending the print command signal to the drive circuit 16,
First, a correction command signal d is sent to the correction control circuit 15 to start it up.

It also has a function of instructing the drive circuit 16 to start printing in response to a correction end signal 15 from the correction control circuit 15. The line feed counter 14 counts and adds up every printed line break -1, and when the specified number of page break lines is reached and the page break ends, a cent is counted.

The correction control circuit 15 drives the tractor 4 in the reverse direction and the forward direction for a predetermined time, and has a predetermined time value set therein, and sends a signal e to the drive circuit 18 in response to a correction command signal d from the print line feed control circuit 13. is sent, the line feed motor 19 is rotated, and the tractor 4 is driven in the opposite direction, that is, in the direction of arrow E shown in FIG.
Then, it is driven again in the forward direction, that is, in the direction of arrow F, for the same period of time. It has a function of sending an end signal r to the printing line feed control circuit 13 when the correction is completed.

The drive circuit 16 selectively drives the print magnet based on print data in order to form characters by dots using the print wire tip of the print head 11.

The drive circuit 17 drives the space motor 9.

The drive circuit 18 rotates the line feed motor 19 in the forward and reverse directions for the commanded line feed, page feed, paper cent feed, and correction feed using the clock signal C in response to the command from the print line feed control circuit 13. .

With such a configuration and function, a method for accurately printing at the print start line position on the printing paper 3 will be explained with reference to FIG. The paper 3 is cut 19i at a perforation, and the positional relationship between the sprocket pin 41 and the feed hole 3a at this time is such that the rear ends are in contact with each other as shown in FIG. 3(b) explained in the conventional example. It has become.

When printing of the next document is started, when the print start button is operated, the print line feed control circuit 13 suspends the start of the printing operation and sends a correction command signal d to the correction control circuit 15 to activate it.

The correction control circuit 15 first drives the tractor 4 in the reverse direction for a set time. That is, the line feed motor 19 is rotated by a predetermined step. Then, this time, it is driven by the same steps in the forward rotation direction. Then, Fig. 3(a) explained in the conventional example
As shown in FIG.
The amount of feed sent in the forward direction is greater than the amount of feed sent in the opposite direction. This difference in feed amount is the difference in diameter between the sprocket pin 41 and the feed hole 3a.

After correction in this manner, printing is started.

Further, an application example of the present invention will be explained with reference to a side view in FIG. 7 and a block diagram in FIG. 8. 7 and 8 are similar to the embodiments described in FIGS. 4 to 6. Instead of immediately starting the correction control circuit 15 in response to the print start signal, the printing paper 3 of the previous document is cut off. The same effect can be obtained with a simple configuration by confirming that the printing paper 3 is present at a predetermined position, that is, by detecting the presence or absence of the printing paper 3 at a predetermined position, and performing correction when it is "absent".

That is, in FIG. 7, the sensor 20 is, for example, an optical sensor that detects the "absence" of the printing paper 3 and outputs a detection signal S.

In FIG. 8, the print line feed control circuit 23 is the drive circuit 16.
1 to 18 have the same function as the print control circuit 13 described in the above embodiment, and when the print command button to start printing a document is operated, the sensor 20 detects the presence or absence of the printing paper 3. It has a function of sending a correction command signal d to the correction circuit 15 upon receiving the detection signal S from the sensor 20.

The sensor amplifier 21 amplifies the detection signal S of the sensor 20 and sends it to the print line feed control section 23 .

With such a structure and function, when the operator cuts the printed paper 3 from the perforation and removes it, there is no longer any printing paper 3 at that position, so when starting printing the next document, the sensor 20 detects ``1 absent'' on the printing paper 3, and ζThe detection signal S sends correction command No. 48 (l) from the print line feed control unit 23, and correction St, +
The control circuit 15 is activated to perform correction A. According to this method, since there is no need for correction when the printing paper 3 is not cut, printing can be started immediately.

In this way, when the printing paper 3 is cut and printing of a new document is started, the position of the printing paper 3 can be easily corrected, and the line spacing of 1 line ['' and 2 tjIJ] can be adjusted to the correct position. can be secured. Therefore, the quality of printed text can be improved.

(As described in detail of the g1 invention, according to the present invention, 1 of the 1-1j letter media
Since the printing line position of the first line can be secured in multiple positions,
This has the effect that the printed lines within one page are aligned and the aesthetic appearance of the printed text can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an outline of a wire tod printer to which the present invention is applied, Fig. 2 is a side view of Fig. 1, and Fig. 3 (
al and (bl are explanatory diagrams of FIG. 1, FIG. 4 is a control block diagram showing an embodiment of the present invention, 5121 is an explanatory diagram of FIG. 4, FIG. 6 is a flowchart of FIG. 4, and FIG. 7 is an explanatory diagram of FIG. 1. 8 is a side view showing an application example of the present invention, and FIG. 8 is a control block diagram of FIG. 7. In the figure, 2 is a platen, 3 is a printing paper, 3a is a feed hole, 4 is a tractor, and 9 is a space motor. , 11 is a print line feed control circuit, 13.23 is a print line feed control circuit, 14 is a line feed counter, 15 is a correction control circuit, 16 to 18 are drive circuits, 19 is a line feed motor, 20 is a sensor, and 21 is a sensor amplifier. .2 Inquiry 3 Prisoner (a) Lord F & No 4 Hear

Claims (1)

[Claims] a platen member; a printing section facing the platen member;
A printer device comprising: a medium transport section for transporting a print medium placed between the platen member and the print section; the printer device prints on the print medium by the print section, the printer device printing a predetermined document on the print medium; The printer is characterized by comprising a print medium correction means for driving the medium transport section in a predetermined amount in the reverse direction and in the forward direction before starting the printing based on a print start command signal instructing the start of printing. Device.