JPH0741216A - Continuous sheet conveying tractor unit structure - Google Patents

Abstract

PURPOSE:To prevent the generation of slackness caused by the lifting of perforation of a continuous sheet so as to make conveying performance in a tractor unit desirable. CONSTITUTION:Continuous sheet conveying tractor unit structure has sheet feeders 1, 2 formed of tractor frames 6 for guiding the side end part of a continuous sheet, pin tractor belts 8 to be fitted into the sprocket holes of the continuous sheet, drive rollers for driving the pin tractor belts 8, and tractor covers for pressing the set continuous sheet. The tractor cover is divided into a closable tractor cover 30 and a fixed tractor cover 31, and the boundary of the closable tractor cover 30 and fixed tractor cover 31 is formed into insert shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor unit for transporting continuous paper as a print medium, particularly continuous paper folded at a constant length with perforations and having sprocket holes of a constant pitch in a printer. Regarding the structure.

[0002]

2. Description of the Related Art FIG. 3 is a plan view showing a conventional example of this type of tractor unit structure, and FIG. 4 is a side view of the same. In the figure, reference numeral 22 denotes a tractor unit, and the tractor unit 22 includes a symmetrical sheet feeder L1, a sheet feeder R2, a lock shaft 3 for fixing the sheet feeder L1, a sheet feeder R2, a sheet feeder L1, and a sheet feeder R2. It is composed of a drive shaft 4 for driving and a center guide 5 for guiding the central portion of continuous paper. The left and right sheet feeders L1 and R2 respectively include a tractor frame 6 for guiding the side edge of continuous paper, a pin tractor belt 8 for fitting into a sprocket hole of continuous paper, and the pin tractor belt 8. It has a drive roller 7 for driving, tractor covers 9 and 10 for pressing the set continuous paper, and a lock lever 11 for holding the set state.

The tractor cover 9 is an openable type, the tractor cover 1
0 is a fixed type, in which the tractor cover is divided into two and one of the tractor covers 10 is a fixed type that does not require an opening / closing space. This is to make it smaller. The operation of the conventional example having the above configuration will be described.

FIG. 5 is a schematic side view showing a printer incorporating the conventional tractor unit 22 having the above structure. In the figure, 12 is a printer main body, 13 is a platen, 14 is a print head, 15 is an ink ribbon, 16 is a carriage assembly, 17 is a front roller, 18 is a paper chute, 19 is a rear pressure roller, 20 is a pull-up assembly, 21 Is a pull-up roller.

As shown in FIG. 4, the tractor unit 22 is incorporated in the printer body 12 at the rear of a printing portion including a print head 14 and a carriage unit 16.
First, the continuous paper 23 is moved up in the direction of the arrow by raising the sheet guide 25, and the continuous paper 23 is passed through the wide portion 26 of the main body to open the left and right tractor covers 9 to open the sprocket holes of the continuous paper 23. After putting in the same position on the pin of the tractor belt on the left and right, close the left and right tractor covers 9.

Next, when a switch (not shown) is pressed, power is transmitted from a control unit drive source (not shown) to the drive shaft 4 by each gear train (not shown), and the drive shaft 4 rotates, whereby the tractor roller 7, The tractor belt 8 rotates and conveys the continuous paper 23. Continuous paper 2 conveyed
3 passes on the paper guide 24. At that time, when the leading end of the continuous paper 23 is detected by the paper end sensor lever 27, a photo sensor and a controller (not shown), the drive source is rotated by a fixed amount, and the continuous paper 23 is conveyed to the printing position.

When the continuous paper 23 is conveyed to the printing position, if data is sent from the computer main body connected to the printer (not shown), the continuous paper 2 is fed from the print head 14.
3 is printed. Further, the carriage unit 16 moves the print head 14 mounted at a predetermined position in the lateral direction of the continuous paper 23 so that the print head 14 prints.

[0008]

However, according to the prior art having the above-mentioned structure, since the tractor cover is divided into two parts in the left and right sheet feeders, the perforation of the continuous paper is conveyed to the boundary between the two tractor covers. If the folding direction of the perforations is a mountain shape from the tractor frame in the direction of the tractor cover when it is sewn, it rises at the boundary line and causes slack in the continuous paper, causing a problem that the transportability in the tractor unit is low. there were.

This problem is particularly serious in a push-type printer that has a tractor unit behind the printing unit and conveys continuous paper. That is, in the unit after printing, the speed is increased by a predetermined amount from the supply speed of the tractor and the continuous paper after printing is supplied while being pulled. However, if slack occurs in the tractor unit, this speed will increase. Disturbance, and therefore the carry amount is not constant. For this reason, the line feed accuracy in the vertical direction of the continuous paper in the printing unit, that is, the line feed accuracy is degraded.

In view of the above problems, the present invention eliminates a portion where the perforations of the continuous paper are released, prevents loosening due to the perforations of the continuous paper rising, and improves the transportability of the tractor unit. Aim to be good. Another object of the present invention is to improve transportability in the tractor unit to prevent the transport amount from being disturbed after printing, maintain good line feed accuracy, and improve the print quality of the printer.

[0011]

In order to achieve the above object, the present invention is such that at least one of the openable and closable tractor cover and the fixed tractor cover always presses the perforations. That is, according to the present invention, a tractor frame that guides a side end portion of a continuous paper, a pin tractor belt for fitting into a sprocket hole of the continuous paper, a drive roller that drives the pin tractor belt, and a set continuous In a tractor unit structure for transporting continuous paper, which has a sheet feeder composed of a tractor cover that holds down a sheet, and the tractor cover is divided into an openable and retractable tractor cover and a fixed tractor cover. The boundary of the tractor hippo is characterized by a nesting shape.

[0012]

According to the present invention, when the perforations of continuous paper pass through the sheet feeder, the boundary between the openable and closable tractor cover and the fixed tractor cover is a closed shape, so the perforations that pass through are always opened and closed. It is possible to maintain the state of being held by both or one of the possible tractor cover and the fixed tractor cover.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. Figure 1
FIG. 3 is a plan view showing an embodiment of the present invention. In the figure, reference numeral 22 denotes a tractor unit, and the tractor unit 22 includes a symmetrical sheet feeder L1, a sheet feeder R2, a lock shaft 3 for fixing the sheet feeder L1, a sheet feeder R2, a sheet feeder L1, and a sheet feeder R2. It is composed of a drive shaft 4 for driving and a center guide 5 for guiding the central portion of continuous paper. The left and right sheet feeders L1 and R2 respectively include a tractor frame 6 for guiding the side edge of continuous paper, a pin tractor belt 8 for fitting into a sprocket hole of continuous paper, and the pin tractor belt 8. It has a drive roller 7 for driving, tractor covers 30 and 31 for holding the set continuous paper, and a lock lever 11 for holding the set state.

The tractor cover 30 is an open / close type, and the tractor cover 31 is a fixed type. As shown in the figure, the boundary S between these tractor covers 30 and 31 has a recessed shape. The operation of this embodiment having the above configuration will be described. FIG. 4 is a schematic side view showing a printer incorporating the conventional tractor unit 22 having the above structure.

In the figure, 12 is a printer main body, 13 is a platen, 14 is a print head, 15 is an ink ribbon, 1
6 is a carriage assembly, 17 is a front roller, 1
8 is a paper chute, 19 is a rear pressure roller, 2
Reference numeral 0 is a pull-up assembly, and 21 is a pull-up roller. As shown in FIG. 4, the tractor unit 22 is built in behind the printing unit including the print head 14 and the carriage unit 16 of the printer body 12.

First, the continuous paper 23 is moved up in the direction of the arrow by raising the sheet guide 25 to the position shown by the chain line in the figure, and the continuous paper 23 is passed through the widened portion 26 of the main body, and the left and right tractor covers 9 are inserted.
Open and put the sprocket holes of the continuous paper 23 in the pins of the tractor belt at the same positions on the left and right, and then close the tractor covers 9 on the left and right. Next, when a switch (not shown) is pressed, power is transmitted from a control unit drive source (not shown) to the drive shaft 4 by each gear train (not shown), and the drive shaft 4 rotates to cause the tractor roller 7 and the tractor belt 8 to rotate. Rotates to convey the continuous paper 23. The conveyed continuous paper 23 passes on the paper guide 24. At that time, when the leading end of the continuous paper 23 is detected by the paper end sensor lever 27, a photo sensor and a controller (not shown), the drive source is rotated by a fixed amount, and the continuous paper 23 is conveyed to the printing position.

When the continuous paper 23 is conveyed to the printing position, if data is sent from the computer main body connected to the printer (not shown), the continuous paper 2 is sent from the print head 14.
3 is printed. Further, the carriage unit 16 moves the print head 14 mounted at a predetermined position in the lateral direction of the continuous paper 23 so that the print head 14 prints.

Here, when the continuous paper 23 is conveyed, when the perforations of the continuous paper 23 pass through the sheet feeder, the boundary S between the tractor cover 30 and the tractor cover 31 has an indented shape, so that the perforation passing through is always the tractor cover. Thirty
It is possible to keep the state in which both or one of the tractor cover 31 and the tractor cover 31 are pressed. That is, as shown in FIG.
The perforations passing between A are pressed down by the tractor cover 30, and the perforations passing between B are instantaneously pressed, but the width is shortened to d ₁ , but the tractor cover 30 continues.
The perforation passing between C is pressed by the tractor covers 30 and 31,
The perforation passing between D is instantaneously pressed down by a width d _{2 but} is still pressed by the tractor cover 31, and the perforation passing between E is pressed by the tractor cover 31.

In the present invention, since the tractor cover is divided into two parts as in the conventional case, the tractor unit can be housed at a position near the printing section in the printer device, and the lightness of the device can be maintained.

[0020]

As described in detail above, according to the present invention, a tractor frame for guiding the side edge of continuous paper, a pin tractor belt for fitting into a sprocket hole of continuous paper, and the pin tractor belt. A tractor for transporting continuous paper, which has a sheet feeder composed of a drive roller for driving a tractor cover and a tractor cover for holding the set continuous paper, and the tractor cover is divided into an openable and retractable tractor cover and a fixed tractor cover. In the unit structure, since the boundary between the openable and closable tractor cover and the fixed tractor cover is formed into a nested shape,
At least one of the openable and closable tractor cover and the fixed tractor cover can always press the perforations.

Since there is no portion where the perforations of the continuous paper are released, the occurrence of slack due to the perforations of the continuous paper rising is prevented, and the transportability in the tractor unit is improved. Further, by improving the transportability of the tractor unit, the transport amount after printing is not disturbed, so that there is an effect of maintaining good line feed accuracy and improving the print quality of the printer.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a schematic side view of a printer to which an embodiment of the present invention is applied.

FIG. 3 is a plan view showing a conventional example.

FIG. 4 is a side view showing a conventional example.

FIG. 5 is a schematic side view of a printer to which a conventional example is applied.

[Explanation of symbols]

 1 sheet feeder L 2 sheet feeder R 6 tractor frame 7 drive roller 8 pin tractor belt 30 tractor cover 31 tractor cover

Claims (1)

[Claims] 1. A tractor frame for guiding a side edge of a continuous paper, a pin tractor belt for fitting into a sprocket hole of the continuous paper, a drive roller for driving the pin tractor belt, and a continuous paper set therein. In a tractor unit structure for transporting continuous paper, which has a sheet feeder composed of a tractor cover that holds down the tractor cover, and the tractor cover is divided into an openable tractor cover and a fixed tractor cover. A tractor unit structure for transporting continuous paper, characterized in that the boundary of the tractor cover is formed in a nested shape.