JPH03234562A - Printing method - Google Patents

Abstract

PURPOSE:To ensure that a medium for printing is not misaligned from its proper position and that a high quality image is printed by enabling data to be printed only when a printing head is moved in a single direction, if it is detected that the medium is held by only one feed roller. CONSTITUTION:If a passbook is not held by two pairs of feed rollers 3, 4 by detection of the position of the passbook or measurement of the transport amount of the passbook, that is, it is interpreted that the passbook is held by the paired feed rollers 3 or 4 alone, a printer is allowed to print data only when a printing head is spaced in an arrow A direction, and the printer is not allowed to print when the head is spaced in an arrow B direction. Consequently, when the medium 24 is held by the paired feed rollers 3 or 4, data is printed, if the head 5 is spaced in a direction where a medium guide 9 is provided on a table. Thus high-quality printing is performed without misalignment of the printing medium 24 from its proper position.

Description

[Detailed Description of the Invention] [Summary] In a printer that uses a thick print medium and prints to the edge of the print medium by spacing the print head in both forward and reverse directions, the print position of characters, etc. on the print medium is determined. Regarding the printing method of a printer that improves accuracy, in order to obtain good print quality, the print medium is conveyed onto the platen by two sets of feed rollers facing each other with the platen in between, and the print head is moved onto the platen. A printer that prints on the print medium by moving it in both forward and reverse directions, comprising a detection means for detecting that the print medium is being held down by only one of the two sets of feed rollers; When the print medium is held down by only one feed roller, printing is performed only when the print head is moved in one direction.

[Industrial application field]

The present invention relates to a printer that uses a thick print medium and prints to the edge of the print medium by spacing the print head in both forward and reverse directions, and particularly relates to a printer that improves the accuracy of the printing position of characters, etc. on the print medium. Concerning the printing method.

With the development of the information society, various printers have been provided that print data processed by information processing devices. There are printers available that print up to the time of the day.

That is, since passbooks are small and have a small printable area, there is a need to increase the printing area as much as possible, and printing has come to be done right up to the edge of the passbook.

By the way, since the thickness of a passbook changes depending on the number of pages, a ribbon mask guide that protects the ribbon inserted between the print head and the passbook is configured to come into contact with the passbook. Therefore, as the printing head moves in space, a force is applied to move the bankbook in the space direction due to the pressing force of the ribbon mask guide, but this ensures that the print quality does not deteriorate when printing around the edges of the bankbook. is necessary.

[Conventional technology]

FIG. 3 is a diagram illustrating an example of the prior art.

Figure 3(a) is a top view, and the third rotation) is a top view.
) is a cross-sectional view of the position indicated by line C of FIG. The bankbook 2 set on the table is conveyed on the table by the feed roller 3 in the direction of the arrow along the medium guide 9 provided on the table, and the leading end of the bankbook 2 reaches the platen l, where it is printed. When stopped at the starting position, printing is performed by the print head 5 spaced in the direction of arrow A or B.

A ribbon cassette 8 is attached to the print head 5, and a ribbon 6 is fed out between the bankbook 2 and the print head 5 from the ribbon cassette 8, and is protected by a ribbon mask guide 7.

The printing head 5 has a carriage (not shown) driven by a space motor, and when printing on the passbook 2 while spacing in the direction of the arrow A, the ribbon mask guide 7 presses the passbook 2 so that the passbook 2 moves in the direction of the arrow A. Although it is pushed in the direction of A, the passbook 2 is blocked by the medium guide 9 and does not move.

Furthermore, when the print head 5 prints while spacing in the direction of arrow B, when the passbook 2 is held down by the feed rollers 3 and 4 and fixed by the frictional force of the feed rollers 3 and 4,
Since the force is greater than the force of the ribbon mask guide 7 that pushes the passbook @2 in the direction of arrow B, the passbook 2 does not move.

However, as shown in FIG. 3(a), printing is performed up to the edge of the bankbook 2, so there are cases where the leading edge of the bankbook 2 has not reached the feed roller 4, and printing up to the rear edge of the bankbook 2. For,
When the rear end of the passbook 2 separates from the feed roller 3, when the print head 5 moves in the direction of arrow B, the ribbon mask guide 7
The force that pushes the passbook 2 in the direction of arrow B is greater than the force that would fix it by the frictional force of only the feed roller 3 or the force that would fix it by the frictional force of only the feed roller 4, and the passbook 2 would swing in the direction of arrow B. .

[Problem to be solved by the invention]

FIG. 4 is a diagram illustrating the problems of the prior art.

When the passbook 2 is held down only by the feed roller 3 and the print head prints while spacing in the direction of arrow A, the medium guide 9 prevents the passbook 2 from shaking and prints in the normal position. However, when printing is performed while the print head is spaced in the direction of arrow B, as described above, the bankbook 2 moves in the direction of arrow B as if the leading end rotates, as indicated by the dotted line.

Therefore, the printing start position is shifted and the printing lines are also skewed, resulting in a problem of poor print quality and unsightly appearance.

In view of such problems, the present invention detects the position of the bankbook 2 or measures the amount of conveyance of the bankbook 2 to determine if the bankbook 2 is not being held down by the two sets of feed rollers 3 and 4. If it is determined that the print head 5 is being held down only by the feed rollers 3 or 4, printing is performed only when the print head 5 is spaced in the direction of arrow A, and printing is performed when it is spaced in the direction of arrow B. The purpose is to obtain good print quality by avoiding the

[Means to solve the problem]

The purpose of this is to use two sets of feed rollers facing each other with the platen in between, and press the end surface of the print medium against the medium guide provided on the table to position the print medium and move it onto the table. In a printer that conveys the set print medium onto the platen from one feed roller side and prints on the print medium by spacing the print head in both forward and reverse directions on the platen, A detecting means is provided for detecting that the set of feed rollers is pressing the print medium, and when the detecting means detects that the set of feed rollers is holding the print medium, there is a print instruction for the print medium. In this case, printing is performed only when the print head is spaced in the direction of the medium guide, or two sets of feed rollers facing each other across the platen are used to feed the print medium to the medium guide provided on the table. While positioning the print medium by pressing the end face, the print medium set on the table is conveyed onto the platen by measuring the conveyance amount from one feed roller side, and the print head is moved onto the platen. In a printer that prints on a print medium with space in both forward and reverse directions, if it is determined from the conveyance amount of the print medium that the print medium is being held down by a set of feed rollers, the print This is achieved by printing only when the print head is spaced in the direction of the medium guide when there is a printing instruction for the medium.

[Effect]

With the above configuration, when the print medium is being held down by a set of feed rollers, printing is performed when the print head is spaced in the direction of the medium guide provided on the table, so the position of the print medium is shifted. It is possible to perform high-quality printing without any problems.

〔Example〕

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention.

The processor 11 reads a program stored in the ROM 12 and operates. When a print medium is set on a table (not shown), the medium detection sensor 20 notifies the processor 11 via the boat 21 that the print medium has been set.

When the processor 11 is notified of the setting of the print medium by the medium detection sensor 2o, the processor 11 sucks the print medium using a suction mechanism (not shown), and sends the print medium through the line feed control circuit 18 to the line feed motor 19.
The printing medium set on the table is conveyed in the direction of the platen 1 along the medium guide 9 of the table shown in FIG. 3(a) by the feed roller 3 shown in FIG. 3(a).

FIG. 2 is a diagram illustrating the arrangement of sensors that detect the position of a print medium.

In FIG. 2, sensors 22 and 23 are used to detect whether or not the print medium 24 is being held down by the feed rollers 3 and 4.
is mounted at the position shown in the figure, and sensors 22 and 23 detect the presence of a recording medium 24.

The processor 11 has a sensor 22 shown in FIG.
The print medium detection signal sent via the sensor 22
The conveyance amount of the print medium 24 is measured from the position by the drive amount of the line feed motor 19, and the printing start position for the print medium 24 is determined.

When the processor 11 stops the print medium 24 at the print start position, the processor 11 stores the print data sent from the host device via the interface circuit 14 in the RAM 13, reads it out, and sends it to the print head 5 via the head control circuit 15. Then, the print medium 24 is printed.

At the same time, the processor 11 drives the space motor 17 via the space control circuit 16 to position the print head 5 at the printing start position and perform the spacing operation of the print head 5, but the sensor 22 detects the presence of the print medium 24. If the sensor 23 does not detect the presence of the print medium 24, printing is performed when the space is in the direction of the arrow A, and printing is not performed when the space is in the direction of the arrow B.

When the sensors 22 and 23 both detect the presence of the print medium 24, printing is performed during the space operation in the directions of arrows A and B, and when the sensors 22 and 23 no longer detect the presence of the print medium 24, printing is performed in the direction of the arrow A. Printing is performed when the space is in the direction of arrow B, and printing is not performed when the space is in the direction of arrow B.

If the processor 11 is not equipped with the sensors 22 and 23, the processor 11 measures the conveyance amount of the print medium from the position of the medium detection sensor 20, and determines the printing start position of the print medium.

When the processor 11 stops the print medium at the print start position, the processor 11 stores the print data sent from the host device via the interface circuit 14 in the RAM 13, reads it out, and sends it to the print head 5 via the head control circuit 15. , print on print media.

At the same time, the processor 11 drives the space motor I7 via the space control circuit 16 to position the print head 5 at the printing start position and perform a space operation of the print head 5, but the print medium from the position of the medium detection sensor 20 is Based on the conveyance amount, if it is determined that the feed roller 3 shown in FIG. 3(a) is holding down the print medium and the feed roller 4 is not holding the print medium, the space in the direction of arrow A in FIG. Printing is performed, but printing is not performed when there is a space in the direction of arrow B.

Then, if it is determined that the feed rollers 3 and 4 shown in FIG. 3(a) are holding down the printing medium based on the conveyance amount of the print medium from the position of the medium detection sensor 20, then if it is determined that the feed rollers 3 and 4 shown in FIG.
Printing is performed when the space is moved in the directions of arrows A and B.

Then, based on the conveyance amount of the print medium from the position of the medium detection sensor 20, when it is determined that the feed roller 4 shown in FIG. 3(a) is holding down the print medium, but the feed roller 3 is not holding it down. Also, printing is performed when there is a space in the six directions of arrows, and printing is not performed when there is a space in the direction of arrow B.

〔Effect of the invention〕

As explained above, in a printer that prints by holding down a print medium with two sets of feed rollers facing each other with a platen in between, when the print medium is held down by one set of feed rollers, the present invention provides a Since printing is performed only when the print head is spaced in the direction of the medium guide, the position of the print medium does not shift, and high-quality printing can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention, FIG. 2 is a diagram explaining the arrangement of a sensor for detecting the position of a print medium, FIG. 3 is a diagram explaining an example of the prior art, and FIG. FIG. 4 is a diagram illustrating the problems of the prior art. In the figure, l is the platen, 2.10 is the passbook, 3.4 is the feed roller, 5 is the print head, 6 is the ribbon,
7 is a ribbon mask guide, 8 is a ribbon cassette,
9 is a medium guide, 11 is a processor, 12 is R
OM, 13 is RAM, 14 is an interface circuit, 15 is a head control circuit, 16 is a space control circuit, 17 is a space motor, 18 is a line feed control circuit,
9 is a line feed motor, 20 is a medium detection sensor, 21
is a boat, 22.23 is a sensor, 10.1, 2m compilation map of one implementation of Thursday Yumei 4. Uma Dai TP Notification/It Hayabusa's book's failure 1 The placement of the sensor to keep out

Claims (1)

[Claims] 1) A print medium is conveyed onto the platen by two sets of feed rollers facing each other with the platen in between, and the print head is moved in both forward and reverse directions on the platen to print on the print medium. A printer that performs the above-mentioned printing has a detecting means for detecting that the printing medium is being held down by only one of the two sets of feed rollers, and the printing medium is being held down by only one of the feeding rollers. A printing method for a printer, characterized in that printing is performed only when the print head is moved in one direction. 2) In a printer that conveys a print medium onto the platen using two sets of feed rollers facing each other with the platen in between, and prints on the print medium by moving the print head in both forward and reverse directions on the platen. A printing method for a printer, characterized in that it is determined from the conveyance amount of the print medium that the print medium is being held down by only one set of feed rollers, and printing is performed only when the print head is moved in one direction. .