JPH04159956A - Removing method of continuous sheet looseness for printer - Google Patents

Abstract

PURPOSE:To certainly remove the looseness of a sheet with a simple mechanism by feeding a tractor in positive direction at a normal speed until the top end of a continuous sheet is headed in a determined position exceeding a printing position, then conducting reverse line feed in a determined amount at a low speed, further conducting positive line feed in the same amount at a speed lower than this speed. CONSTITUTION:A continuous sheet 10 is forcedly fed at a normal feed speed by a tractor 11 rotating in positive direction until it is headed in a determined position over a printing part 15. At this time, as the sheet 10 is moved along not a platen 13 side but a guide 17, a looseness 10a is generated in the feed passage of the sheet 10. When it is detected that the top end 10c of the sheet 10 reaches the determined position, the tractor 11 is stopped, and, at the same time, reverse line feed is conducted in a determined amount at a low speed. At this time, the top end 10c of the sheet 10 is lightly held so as to be slipped to the platen 13 rotating in positive direction. The looseness between reversed line feeds of the sheet 10 is gradually reduced, and the sheet is moved on a broken line 10b side. At the point of time where the looseness is considerably reduced, the tractor 11 conducts positive line feed in the same quantity at a further low speed.

Description

[Detailed Description of the Invention] [Summary] A tractor that forcibly feeds the continuous paper by engaging with a feed hole of the continuous paper; A continuous paper slack removal device in a printer, comprising a printing section formed between a rotating platen and a print head, and a guide guide for guiding continuous paper from the tractor to the printing section along the outer periphery of the platen. An object of the present invention is to provide a method for removing slack in continuous paper for a printer, which can reliably remove slack in the paper with a simple mechanism, wherein the tractor has its head positioned at a predetermined position where the leading edge of the continuous paper exceeds the stomach at the printing position. Feed in the forward direction at normal speed until it comes out,
A method for removing slack in a continuous sheet is characterized in that the paper is then driven to perform a reverse line feed by a predetermined amount at a low speed, and then to perform a forward line feed by the same amount at an even lower speed.

[Industrial application field]

The present invention relates to a continuous paper slack removal method for a printer having a continuous paper feeding mechanism, and in particular, a tractor that engages with a feed hole of continuous paper to forcibly feed the continuous paper, and a direction in which the continuous paper is fed by the tractor. a printing section formed between a platen that rotates in a forward direction and a print head defining different feeding directions; and a guide guide that guides continuous paper from the tractor to the printing section along the outer periphery of the platen. The present invention relates to a continuous paper slack removal device in a printer comprising:

In platen wrapping type printers, the direction in which the continuous paper is fed by the tractor and the direction in which the continuous paper moves in the printing section between the print head and the platen are usually different, so the continuous paper is transported while being guided by a guide member between them. Paper is sent. Therefore, when continuous paper is automatically loaded, the continuous paper becomes slack in its feeding path, and the amount of cueing becomes unstable. Therefore, in a printer that handles continuous paper, a means for removing slack in the paper is required.

[Conventional technology]

In a printer that has a continuous paper feeding mechanism, the gap in the continuous paper feeding path is set to be wider than the thickness of the continuous paper itself, taking into consideration the height of the folds provided at predetermined intervals on the continuous paper. . For this reason, in a printer that wraps around the platen, the direction in which the continuous paper is fed by the tractor is different from the direction in which the continuous paper is fed in the printing section between the print head and the platen. It becomes a state. This occurs because the continuous paper has a certain degree of stiffness and because the platen cannot pull the continuous paper sufficiently, causing slippage between the platen and the paper.

In order to remove such slack, it has conventionally been customary to automatically feed the continuous paper and then forward the continuous paper at a low speed (LF speed) to remove the slack.

Additionally, there is a method in which the continuous paper guide is mechanically operated to minimize slack.

[Problem to be solved by the invention]

However, after automatic filling of continuous paper, low speed (LF)
The conventional method of taking up the slack by forward feeding at a speed of .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a continuous paper slack removal method for a printer that can reliably remove paper slack using a simple mechanism in a printer that handles continuous paper.

[Means to solve the problem]

In order to solve such problems, the present invention provides a tractor that engages with a feed hole of continuous paper to forcibly feed the continuous paper, and a printing section formed between a platen and a print head. and a guide guide for guiding continuous paper from the tractor to the printing section, wherein the tractor moves in the forward direction at normal speed until the leading edge of the continuous paper is cued up to a predetermined position beyond the printing position. There is provided a method for removing slack in continuous paper, which is characterized in that the continuous paper is driven to feed the paper, then perform a reverse line feed by a predetermined amount at a low speed, and then perform a normal line feed by the same amount at a speed lower than the above speed.

[Effect]

According to the present invention, after locating the beginning of a -degree continuous sheet, the line is reversely fed by a predetermined amount at a low speed (LF speed). At this time, the tractor sends the continuous paper in the reverse direction, but the continuous paper almost slides against the platen, and the leading edge of the continuous paper hardly moves until the slack is taken up. Next, when a normal line feed is performed by the same amount at an even lower speed (micro LF speed), the leading edge of the continuous sheet follows the platen and is positioned at the correct position while the slack is removed.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the paper feeding and printing section of a printer that employs the method for removing slack in continuous paper according to the present invention, and FIG. 2 is a diagram illustrating the method for removing slack in continuous paper.

In these figures, feed holes (not shown) are provided at predetermined intervals on both side edges of the continuous paper lO, and the feed protrusion 12 of the tractor 11 engages with the feed hole of the continuous paper 10, and the continuous paper 10 is is sent in the direction of arrow P to pass through the printing section 15 formed between the platen 13 and the printing pad 14. While the continuous paper 10 is being fed, the platen 13 is always rotated forward (in the Q direction) at a constant speed. Platen 1
The rotational circumferential speed of No. 3 is set to be 2 to 3% higher than the normal feeding speed of the tractor 11, and the platen 13 feeds the continuous paper 10 with slight slippage. Printing section 1
The leading edge of the continuous paper 10 that has passed through the paper 5 is pressed toward the platen 13 by a pail roller 16 to ensure feeding by the platen 13.

As is clear from FIGS. 1 and 2, the printing section 15 formed between the feeding direction (substantially horizontal direction) of the continuous paper 10 by the tractor 11 and the platen 13 and the printing head 14
Since the feeding direction (approximately vertical direction) of the continuous paper 10 is different from that of the continuous paper 10 in the
The guide along the outer periphery of the platen 13 is ID 1.
7 is provided. As described above, the gap in the feed path of the continuous paper 10, that is, the gap between the platen 13 and the guide 17, is determined by the height of the folds (not shown) provided at predetermined intervals on the continuous paper 10. Considering, continuous paper 10
It is set wider than its own thickness.

FIG. 3 is a diagram showing the operation of the tractor, and FIG. 4 is a diagram showing the relationship between paper feeding speed and dynamic friction coefficient. In FIGS. 1 to 4, first, the continuous paper 10 is fed in the forward direction along the guide 17 until the leading edge of the continuous paper 10 is positioned at a predetermined position beyond the printing section 15. It is forcibly fed at a normal feed rate by the tractor 11 rotating in the direction. At this time, since the continuous paper 10 tries to move along the guide 17 side instead of the platen 13 side as shown by the solid line in FIG. 2, slack 10a occurs in the feeding path of the continuous paper 10.

When a sensor (not shown) or the like detects that the leading edge 10C of the continuous paper 10 has reached a predetermined position (for example, the position shown in FIG. 2), the tractor 11 stops and at the same time moves at a low speed (LF speed). Quantitative reverse line feed.

At this time, the leading edge of the continuous paper 10 is lightly held in a state where it almost slides against the platen 13 rotating in the forward direction. Then, while the continuous paper 10 is reversely line-feeding, the slack gradually disappears and it moves to the side of the broken line 10b in FIG. 2. When the slack is considerably reduced, the tractor 11 performs a normal line feed by the same amount at a speed even lower than this speed (micro LF speed). Since the speed of the platen 13 is much faster than the speed of the tractor 11 (the speed of the micro LF) at this time, the continuous paper 10 is pulled and fed by the platen 13, and during this time the continuous paper 10 is completely moved to the position shown in FIG. The ideal route 10b shown by the broken line will be followed.

What is important here is the proper use of slow speed (micro LF speed) and fast speed (LF speed). As shown in FIG. 4, the coefficient of dynamic friction changes depending on the speed. That is, the dynamic friction coefficient μ at the speed of the micro LF, and L
Using the difference between the coefficient of dynamic friction at the speed F, the continuous paper 10 is caused to slide against the platen 13 when a reverse line feed is performed, and is made to follow when a forward line feed is performed.

It is more effective to repeat the above operation multiple times. That is, by repeating reverse line feed at the LF speed and normal line feed at the slower micro LF speed several times, slack can be further reduced.

〔Effect of the invention〕

As explained above, according to this paper, after starting the beginning of a -degree continuous paper, the line feed is reversed by a predetermined amount at a low speed (LF speed), and then by the same amount at an even lower speed (micro LF speed). By simply controlling the rotation of the tractor to perform a normal line feed, most of the slack in the continuous paper can be removed, the continuous paper can be positioned at the correct printing position, and the print quality can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the paper feeding and printing section of a printer that employs the continuous paper slack removal method of the present invention, Fig. 2 is a diagram for explaining the slack removal method, and Fig. 3 is a diagram showing the operation of the tractor. , FIG. 4 is a diagram showing the relationship between the paper feed speed and the coefficient of dynamic friction. DESCRIPTION OF SYMBOLS 10... Continuous paper, 10a... Loose paper, 10b... Paper without slack, 10C... Leading edge of continuous paper, 11... Tractor, 12... Protrusion, 13... Platen , 14...Print head, 15...Printing section, 16...Pail roller, 17...Guidance guide.

Claims (1)

[Claims] 1. A tractor (11) that engages with the feed hole of the continuous paper (10) to forcefully feed the continuous paper, a platen (13), and a print head (14). Printed area (15)
and a guide (17) for guiding continuous paper from the tractor to the printing section,
The tractor (11) feeds the continuous paper in the forward direction at a normal speed until the leading edge (10c) of the continuous paper is positioned at a predetermined position beyond the printing part (15) position, and then reverses the line feed by a predetermined amount at a low speed (LF). A continuous paper slack removal method characterized in that the continuous paper is then driven to perform a normal line feed by the same amount at a speed (micro LF) lower than the above speed. 2. The rotational peripheral speed of the platen (13) is
2. The continuous paper slack removal method according to claim 1, wherein the continuous paper slack removal method is 2 to 3% higher than the normal feeding speed of ). 3. The tractor (11) performs a predetermined amount of reverse line feed at low speed (LF) and at a speed even lower than this speed (micro LF).
2. The method for removing slack in continuous paper according to claim 1, wherein the same amount of normal line feed in ) is repeated a plurality of times.