JPH0445971A - Printer and method for correcting curl of printing paper - Google Patents

Abstract

PURPOSE:To simply prevent the generation or paper jamming caused by the curl of the rear end part of printing paper at the discharge time of the printing paper at low cost by always moving a carriage over the entire width of a space operating range when the curl of the rear end of the printing paper is corrected. CONSTITUTION:Prior to discharging printing paper 100, the position of the rear end 100b of the printing paper 100 is detected. When the printing paper 100 is present at a position shifted from a paper feed path 61, the printing paper 100 is fed in a discharge direction until the rear end 100b of the printing paper reaches the paper feed path 61 and, thereafter, a carriage 12 is moved over the entire width of a space operating range from one end thereof to the other end thereof. By this operation, the curl of the rear end 100b of the printing paper is corrected.

Description

[Detailed Description of the Invention] [Summary] Regarding a printer that discharges print paper in a direction that returns it to its original position before suction, and a method for correcting the curl of the print paper, the present invention relates to a printer that discharges print paper in a direction that returns it to its original position before suction, and a method for correcting the curl of the print paper. The purpose of this system is to easily and inexpensively prevent paper jams from occurring when the printing paper is ejected, by detecting the position of the trailing edge of the printing paper and detecting whether the printing paper has come off the paper transport path. When the printing paper is in the position, the printing paper is fed in the ejection direction until the rear end of the printing paper reaches the paper transport path, and then the carriage is moved across the entire width from one end of the space movement range to the other end. Configure.

[Industrial application field]

The present invention relates to a printer that discharges print paper in a direction that returns it to its original position before suction, and a method for correcting the curl of the print paper.

In so-called horizontal printers, printing paper is sucked in from a table and discharged onto the table again. In this case, when the paper is ejected, the printing paper is fed from the printing section to the paper transport path 1 with the trailing end at the beginning.

However, the printing paper curls toward the printed side, so if the printing reaches near the trailing edge of the printing paper, the trailing edge of the printing paper will curl and the paper will not be fed smoothly into the paper transport path when the paper is ejected. This will result in a paper jam. Therefore, it is necessary to take some measures to prevent such paper jams.

[Conventional technology]

To avoid jams when paper is ejected,
Prior to paper ejection, it is preferable to push the trailing edge of the printing paper into the paper transport path to correct curls at the trailing edge of the printing paper. To do this, the carriage may be moved in the space direction while pressing the rear end portion of the printing paper against the curl with a member attached to the carriage.

Conventionally, as shown in Japanese Patent Publication No. 1-99865, for example, when printing, the range of the number of digits actually printed is memorized, and the carriage is moved in space within the range of the number of digits. I was correcting curls in printing paper.

In addition, there was also one in which the width of the printing paper was detected and the gear ridge was operated in space within the range of the detected width.

[Problem to be solved by the invention]

However, in a system that moves the carriage in space within the range of the number of printing digits, it is necessary to install a storage means for the number of printing digits and control it, making it complicated and costly. Since the paper is not pushed into the paper, there is a risk of paper jamming.

Furthermore, in the case where the carriage is moved in a space within the range of the width of the printing paper, it is necessary to install a sensor to detect the paper width, control the sensor, etc., which has the disadvantage of being complicated and costly.

The present invention solves such conventional drawbacks and provides a printer and its printing paper curl correction that can easily and inexpensively prevent the occurrence of paper jams caused by curling of the trailing edge of paper when paper is ejected. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the printer of the present invention has a first
As shown in the figure, the printing paper 100 is equipped with a print head 13 for printing on the printing paper 100.
a carriage 12 provided movably in the space direction along the plane; a spacing means 3 for moving the carriage 12 in the space direction; and the printing paper 10.
0 into the printing unit 10 facing the print head 13, and when discharging the paper, a paper feeding means 5 for ejecting the Hokkaido printing paper 100 in a direction returning to the position before suction, and a paper feeding means 5 for guiding the running of the printing paper 100. For this purpose, a paper transport path 61 formed on the paper suction/discharge side from the printing unit 10, a paper trailing edge position detection means 6 for detecting the position of the printing paper trailing edge 100b, and a paper transport path 61 formed on the paper suction/discharging side of the printing section 10, a paper trailing edge position detection means 6 for detecting the position of the printing paper trailing edge 100b, and the printing paper 100 being ejected. In order to correct the curl of the trailing edge 100b of the printing paper prior to this, a signal is input from the paper trailing edge position detection means 6, and when the printing paper 100 is at a position away from the paper transport path 61, After driving the paper feeding means 5 to feed the printing paper 100 in the ejection direction until the trailing edge 100b of the printing paper reaches the F paper transport path 61,
The present invention is characterized in that a paper curl correcting means 7 is provided which allows the spacing means 3 to move the carriage 12 across the entire width of the space movement range from one end to the other end.

Note that a paper guide 17 that faces the printing paper 100 side in close proximity is attached to the carriage 12 (P, -4- marked printing paper 100 is pressed against the paper guide I7, and the printing paper rear end 100b The curl may be corrected.

Further, the printing paper]00 is sent by the paper feeding means 5.
It may be so arranged that the gas is inhaled and expelled horizontally.

Further, in the printing paper curl correction method of the present invention, after the printing paper 100 is sucked into the printing unit 10 and printed by the print head 13, when the paper is ejected, the printing paper 100 is returned to the position before sucking. In a printer configured to eject, before ejecting the printing paper 100,
When the position of the trailing edge 100b of the printing paper is detected and the printing paper 100 is located outside the paper conveyance path 61, until the trailing edge 100b of the printing paper marked -F reaches the inside of the paper conveyance path 61. After feeding the printing paper 100 in the ejection direction, moving the carriage 12 over the entire width from one end of the space movement range to the other end,
The present invention is characterized in that the curling of the trailing edge of the printing paper], OOI) is corrected by the above-mentioned operation.

Note that the carriage 12 may first move j7 to one end of the space movement range, then move to the other end of the space movement range, and then stop there.

[Effect]

Before ejecting the printing paper 100, the position of the trailing edge 100b of the printing paper is detected, and when the printing paper 100 is located away from the paper transport path 6I, the trailing edge toob of the printing paper is detected. The printing paper 100 is fed (,
After that, the carriage 12 is moved over the entire width of the space movement range from one end to the other end, and the curl at the trailing edge 100b of the printing paper is corrected by the above operation.

〔Example〕

Examples will be described with reference to the drawings.

FIG. 2 shows the overall configuration of the printer.

In the figure, IO is a printing unit for printing on printing paper 100. 11 is the platen. 12 is a carriage provided movably in the space direction along a stay shaft 16 provided parallel to the platen 11.

A print head for printing on the print paper 100 can be accessed on the carriage J2, and the head cover 14 is covered over the print head.

] 5 is a ribbon cassette loaded with an ink phone for printing, and is detachably attached to the carriage 12. Reference numeral 17 denotes a plate-shaped paper guide that is attached to the carriage 3 so as to be close to and face the printing paper 100 side.

30 is a space motor serving as a drive source for driving the drive belt 3I connected to the carriage 12 and moving the gear ridge 12 in the space direction; 40 is a space motor that drives the drive belt 3I connected to the carriage 12;
It is a table for placing 0, and the printing paper 100 is
The paper is sucked into the printer from the table 40 side, printed, and then discharged to the table 40 side. Reference numeral 41 indicates the paper intake/discharge port.

FIG. 3 is a partial side view of the printer described above.

A pair of paper feed rollers 5]a, 51b, 52a, and 52b are arranged before and after the platen 11, respectively, and are rotationally driven by a line feed motor 50. As the line feed motor 50, a step motor is used. In addition, the platen 11 is also connected to the line feed motor 5.
0 rotates in the same direction. Therefore, by controlling the rotation of the line foot motor 50, printing paper +00 is sucked into the printing section 10 from the suction/discharge port 41, or υ1. I can do rivers.

The paper conveyance paths 6], 62 are formed horizontally on the front side (the suction/discharge port 41 side) and the back side with the printing section 10 in between so as to be able to guide the printing paper 100 horizontally and straightly. However, in the following description, the suction t, II output 4 output side 4I side conveyance path 61 will be simply referred to as "sheet 1 general conveyance path 6".

The paper conveyance path 61 is open on the -1- side in the printing section]0 so that the carriage 12, print head 13, etc. do not collide with each other. 01a is the inner end of the paper conveyance path 61.

Along the paper transport path 61, paper feed rollers 51a, 5]
, b are provided with a paper detection sensor 60 +-1. Any type of paper detection sensor 60 may be used, such as a mechanical one-barrel type sensor.

Note that in FIG. 3, the space direction is perpendicular to the plane of the paper, and the carriage 12 moves in the space direction along the stay shirt l-16, and the paper guide 17 attached to the carriage [2] also moves in the space direction. , along with printing paper 10
Move along the 0 plane in the space direction.

Figure 4 shows the main circuit of the printer mentioned above.
The main control unit 70 has built-in signals such as CPtJ, RA, M, and R○M, and receives print signals from post equipment (not shown), and receives signals from the front edge of the print paper 100 from the paper detection sensor 60. and a detection signal for detecting the rear end]0(]b, etc. are input.

The output end of the main control unit 70 includes a space control unit 71 for controlling the operation of the space motor 30, a line feed control unit 72 for controlling the operation of the line feed motor 50, and a printing operation of the print head 13. A printing control unit 73 and the like are connected thereto.

FIG. 5 shows a control flow when the printing paper 100 is discharged after printing is completed. S indicates a step.

This flow starts when printing to the last line of the printing paper 100 is completed or when a command to forcibly eject the printing paper 100 is issued.

Note that the number of steps of the line feed motor 50 when the trailing edge 100b of the printing paper was detected by the paper sensor 60 when the printing paper 100 was previously sucked is memorized, and the position of the trailing edge 100b of the paper thereafter is memorized. can be calculated from the number of steps of the line feed motor 50.

In this process, before driving the line feed motor 50, the position of the trailing edge of the square paper 1.001:) is calculated (s
l).

Then, it is determined whether the printing paper 100 is at a position away from the paper transport path [31], that is, whether the position of the trailing edge 100b of the paper is on the right side of the inner end 6 of the paper transport path [a] in FIG. (s2).

If the trailing edge 100b of the paper is within or in front of the paper transport path 61, the space motor 30 is driven to move the carriage 12 once to the left end of the space range, and then to the right end of the space range over the full width. and then stop the space motor 30 (s
3). As a result, even if the trailing edge 100b of the printing paper is curled toward the printing surface, it is pressed against the paper guide 17 and pushed into the paper transport path 61, and the curl is corrected.

After reaching this state, the line feed motor 50 is reversed to cause the printing paper 100 to wander toward the front (to the left in FIG. 3), and the process ends.

In s2, when the printing paper] and OO are located at a position away from the paper transport path 61, that is, when the position of the printing paper rear end]00b in FIG. 3 is on the right side of the inner end of the paper transport path [31a] The line feed motor 50 is reversed by the number of steps necessary for the trailing edge 100b of the printing paper to reach the inside of the paper transport path 61 on the left side of the inner end 61a of the paper transport path (s5), and then the curl correction operation of s3 is performed. 84 paper ejection operation is performed.

Note that if the printing paper 100 has not moved to a position where it is removed from the paper conveyance path 61 even once before the paper is ejected, s3
The curling operation may be omitted and the sheet discharging operation at S4 may be performed.

〔Effect of the invention〕

According to the present invention, when performing curl correction at the trailing edge of printing paper, the carriage is always moved over the entire width of the space movement range, so that curl correction is always performed over the entire width of the printing paper, and the number of printed digits and Since there is no need for a paper width detection means or its control, the present invention has an excellent effect of reliably preventing the occurrence of paper jams when discharging paper, easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the present invention, FIG. 2 is a perspective view of the embodiment; FIG. 3 is a partial side view of the embodiment; FIG. 4 is a circuit block diagram of the embodiment, FIG. 5 is a processing flow diagram of the embodiment. In the figure, 3... Spacing means, 5...Paper feeding means, 6... Paper trailing edge position detection means, 7...Paper curl correction means, 12... Carriage, 13...Print head, 61...Paper conveyance path, 100...printing paper, 100b: Trailing edge of printing paper.

Claims (1)

[Claims] 1. A carriage mounted with a print head (13) for printing on the printing paper (100) and provided movably in the space direction along the surface of the printing paper (100). (12); spacing means (3) for moving the carriage (12) in the space direction; and sucking the printing paper (100) into the printing section (10) facing the printing head (13). , when discharging the paper, there is a paper feeding means (5) for discharging the printing paper (100) in the direction to return it to the position before suction; a paper conveyance path (61) formed on the suction and discharge side of the paper, a paper trailing edge position detection means (6) for detecting the position of the trailing edge (100b) of the printing paper, and discharging the printing paper (100). In order to correct the curl of the trailing edge (100b) of the printing paper prior to printing, a signal is input from the paper trailing edge position detection means (6), and the printing paper (100) is moved along the paper transport path (61). When the paper is out of the position, the paper feeding means (5) is driven to feed the printing paper (100) in the ejection direction until the trailing edge (100b) of the printing paper reaches the paper transport path (61). The printer is characterized in that it is provided with paper curl correction means (7) for moving the carriage (12) over the entire width from one end side to the other end side of the space movement range by the spacing means (3). 2. A paper guide (17) facing the printing paper (100) is attached to the carriage (12), and the paper guide (17) faces the printing paper (100).
2. The printer according to claim 1, wherein curling of the trailing edge (100b) of the printing paper is corrected by being pressed against the paper. 3. The printing paper (1) is transported by the paper feeding means (5).
3. The printer according to claim 1, wherein the printer 00) is sucked in and discharged horizontally. 4. After the printing paper (100) is sucked into the printing unit (10) and printed by the print head (13), when the paper is ejected, the printing paper (100) is ejected in the direction back to the position before suction. In this printer, before ejecting the printing paper (100), the position of the trailing edge (100b) of the printing paper is detected, and the position where the printing paper (100) is removed from the paper transport path (61) is detected. when the printing paper (100b) reaches the paper conveyance path (61).
00) in the ejection direction, the carriage (
12) A method for correcting curling of printing paper, characterized in that the paper is moved over the entire width from one end side to the other end of a space movement range, and the curling of the trailing edge (100b) of the printing paper is corrected by the above operation. 5. The method for correcting curling of printing paper according to claim 4, wherein the carriage (12) first moves to one end of the space movement range, then moves to the other end of the space movement range, and then stops there.