JPS6244471A - Paper feed mechanism of printer - Google Patents

Abstract

PURPOSE:To prevent the jamming and wastefulness of paper at the time of automatic loading, by excessively feeding continuous paper at the time of cutting and returning the same by an one-inch cut blank dimension L before performing the next printing. CONSTITUTION:After the first printing line of continuous paper has been set to a printing head 9, a control part 21 brings an opening/closing magnet to an open state and continuous paper 1 is pressed to the side of a platen 5 by a discharge roller 11 by utilizing the force of a spring 13 and moved upwardly when the platen 5 is rotated. Thereafter, printing and line feed operation are performed to a sheet 17. After the printing of the sheet 17 is finished, the control part 21 feeds a paper cutting position from a sensor position toward the direction shown by an arrow B by a predetermined length while the continuous paper 1 is monitored by a positioning sensor 8 in order to match the paper cutting position 16 of the continuous paper 1 after the completion of printing with the position of a cutter provided at a position of no contact with the sheet leading end 15 of the continuous paper 1 upwardly moving in the same way as the paper discharge roller 11.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to paper conveyance 8! of a printing device. In particular, the present invention relates to a paper transport mechanism of a printing device that is suitable for preventing jams and reducing paper margins in a paper transport mechanism of a general-purpose printer with a -1 cut.

[Background of the invention]

Conventionally, in printing devices that have an autoloading function for single sheets and continuous sheets,
As described in the publication, by opening and closing the paper ejection roller provided at the rear stage of the printing mechanism section during automatic paper loading, that is, moving it away from the paper, the leading edge of the paper comes into contact with the paper ejection roller that ejects the paper upward. This prevents jams from occurring.

Furthermore, in order to minimize the waste of paper, a method of installing a -1 cut mechanism inside the printer has recently been widely used. As a result, the leading edge of the paper that has passed the paper ejection roller during autoloading is caught in the cutter, resulting in a jam, similar to the above problem. There is a way to move it away from the paper in the same way as the paper ejection roller, but it is not easy to do so because it complicates am and increases the waste of paper.

[Purpose of the invention]

The purpose of the present invention is to solve such conventional problems, and to prevent paper jams during autoloading and reduce paper waste using a simple and inexpensive method for printers having an autoloading function and a one-inch cut mechanism. It is an object of the present invention to provide a paper conveyance mechanism for a printing device that can further reduce the number of sheets.

[Summary of the invention]

In order to achieve the above object, the paper conveyance mechanism of the printing device of the present invention includes a printing means for printing on paper, a conveyance means for conveying the paper, and a cutter section for cutting the paper. The cutter unit (cutter 14) is installed at a distance from the margin dimension (L) at the leading edge 1 (15) of the paper (continuous paper l).

When printing after cutting the paper with the cutter section, the conveying means transports the paper in a returning direction (direction of arrow C) until the margin size is reached, and the printing means prints on the surface of the paper. There are characteristics.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

1(a) to (c) are side views of a paper conveyance mechanism of a printing device showing an embodiment of the present invention, FIG. 2 is a control system configuration diagram of the paper conveyance mechanism, and FIG. It is a flowchart of operation.

In FIGS. 1(a) to (c), 1 is a continuous sheet of paper, 2 is a stepping motor that rotates a T pulley 6 and a P pulley 7 via a belt 3, and conveys the continuous sheet 1;
is a tractor that supports the T pulley 6, etc., 5 is a platen that supports the P pulley 7, etc., 8 is a positioning sensor for determining the position of the continuous paper 1, 9 is a print head that prints on the continuous paper 1, and 10 is a paper ejection Continuous paper 1 with roller 11
12 is an opening/closing magnet that moves the paper ejection roller 11 to the position indicated by the two-dot chain line, 13 is a spring that presses the paper ejection roller 11 against the continuous paper 1, 14 is a cutter that cuts the continuous paper 1, 15 is the leading edge of the continuous paper 1, 16 is the cutting position of the continuous paper 1, 17 is the current sheet, 18 is the next sheet, A to C are the arrow directions, L is the 1 inch cut margin dimension, and in FIG. is operation panel 2
2. Based on the host device 25 and the positioning sensor 8, the print head 9. The control unit 23 that controls the opening/closing magnet 12 and the motor 2 is 11/12 inches and 12/12 inches.

The margin size switch is 13/12 inches, and 24 is a continuous print switch.

Note that FIGS. 1(a), (b), and (c) are state diagrams after automatic loading of continuous paper 1, state diagrams after printing on the sheet 17 is finished, and state diagrams after the sheet 17 is not cut. This is a state diagram in which printing is performed on the first line of the primary sheet 18.

The control unit 21 drives the motor 2 and the like according to a method described later based on a command from the host device 25 to perform an autoloading operation on the paper transport mechanism.

Executes printing operations, line feed operations, etc.

For the paper conveyance mechanism shown in FIGS. 1(a) to 1(c), the control unit 21 drives the motor 2 to drive the belt 3 in the direction of arrow A. By rotating the T pulley 6 and P pulley 7 attached to the tractor 4 and platen 5 in the direction of arrow B, the tractor 4
The upper continuous paper 1 is conveyed in the direction of arrow B. During autoloading (step 101), the control unit 21 stops the continuous paper 1 at the value of the 1-inch cut margin specified by the margin size switch 23, as shown in FIG. Next, while the continuous sheet 1 is monitored by the positioning sensor 8, after the leading edge 15 of the sheet passes the sensor position, it continues to be conveyed for a predetermined length in the direction of arrow B. In other words, by outputting a predetermined number of driving pulses to the stepping motor 2 and rotating it, the first
Control so that the print line is aligned (Step 10)
2゜104), The -inch cut margin size can be determined by the operator using the margin size switch 23 on the operation panel 22.
(or dial, etc.) to select the mode (11/12 inches, 1
Decide on the desired price by specifying either 2712 inches or 13/12 inches. Also, during autoloading, by retracting the paper ejection roller 11 to the position shown by the two-dot chain line in FIG. Do it like this. That is, the opening/closing magnet 12 is driven so as to perform a suction operation, and is placed in the position indicated by the two-dot chain line.

After setting the first print line of the continuous paper 1 to the print head 9, the control unit 21 releases the opening/closing magnet 12 and uses the force of the spring 13 to move the continuous paper 1 onto the platen 5.
While pressing the paper to the side with the paper ejection roller 11, the platen 5
When the continuous paper 1 is rotated, the continuous paper 1 is moved upward. In other words, the continuous paper l printed by the print head 9
When the platen 5 is rotated clockwise by the mask 10 and the paper ejection roller 11 provided in the front, the platen 5 is moved in the direction of arrow B, that is, toward the upper cutter 14, along with the movement of the platen 5. . Thereafter, printing and editing operations are performed on the sheet 17 (steps 105 and 106).

After the printing of the sheet 17 is completed, the control unit 21 controls the cutter 1, which is provided at a position where it does not come into contact with the sheet leading edge 15 of the continuous paper 1 moving upward, similar to the paper ejection roller 11.
As shown in FIG. 4B, in order to align the paper cut position 16 of the continuous paper 1 after printing with respect to the position 4, the continuous paper 1 is monitored by the positioning sensor 8 and cut position 16 is adjusted in the same manner as described above. is conveyed a predetermined length in the direction of arrow B from the sensor position. In other words, a predetermined drive pulse is output to the stepping motor 2 to rotate and control it (step 107).In addition, when cutting the sheet 17 at this cutting position 16, the operator cuts the sheet 17 on the printing bed. By pulling it toward the 9 side, the continuous paper l is pressed against the cutter 14 and recut (step 108).

Next, when printing and line feed on the primary sheet 18 (step 109), the control unit 21 first moves the motor 2 and belt 3 in the direction opposite to the direction of the arrow when autoloading, as shown in CC) of the same figure. C side and drive the platen 5 counterclockwise to cut the continuous paper l again by 1 inch, that is, return the first print line to the front of the print head 9 (step 110). . Thereafter, in the same way as for the sheet 17 described above, a print command for the next sheet 18 is sent to the print head 9 to perform printing and line feed. Once all print commands have been repeatedly printed, the operation ends.

On the other hand, in step 102, if the continuous print switch 24 is specified instead of the margin size switch 23 (step 103), the control unit 21 does not need to cut each sheet, so 1
It is possible to omit the operation of ``feeding out for sheet cutting'' after printing on sheet 7 and the operation of ``returning the sheet to convey the sheet'' immediately before printing on the next sheet 18. only is executed until the print command is completed (steps 111, 112).

Note that the mode setting of the continuous printing switch 24 on the operation panel 22 is performed by the operator. Since both of the above operations can be omitted, the processing speed can be increased during continuous printing operations.

In this way, the cutter 14 is placed at a position sufficiently far away from the paper ejection roller 11 in the paper transport mechanism (that is, a position larger than the -inch cut margin dimension).

The cutting position 16 of the continuous paper 1 is further conveyed to the position of the cutter 14 after printing on the sheet 17 is completed.

Next, by returning the continuous paper 1 to the first printing line before printing on the next sheet 18, it is possible to prevent jams caused by the cutter 14 and the continuous paper 1 getting caught during autoloading. . Since not only the top end 15 of the first sheet during autoloading but also the continuous paper 1 is not brought into contact with the cutter 14 at all, jamming when the continuous paper 1 is ejected is also prevented.

Furthermore, even when the cut margin size is small, such as 11/12 inches or less, there is no need to add a member that generates a paper feeding load to the paper ejection section.
This can be realized by returning the continuous paper 1, and the continuous paper 1 can be used effectively. The margin size switch 23 is on the operation panel 22.
By making it possible to specify (11/12 inches, 12/12 inches, 13/12 inches), you can change the -inch cut margin size to any desired size without changing the position of the cutter 14. can. Since another continuous printing switch 24 can be provided to provide instructions, it is possible to improve the processing speed of continuous printing on continuous paper l that does not need to be cut for each sheet. As a result, the operator or the like can set the margin size of the 1-inch cut according to the slip, and this has the effect of improving the processing speed when cutting for each sheet is not necessary.

[Purpose of the invention]

As explained above, according to one aspect of the present invention, in a printer having an autoloading function and a one-inch cutting mechanism, when cutting continuous paper, the paper is conveyed extra, and then -
Since the next printing is performed after returning to the size of the cut margin, jams due to contact between the cutter and continuous paper during autoloading can be prevented without complicating the paper transport mechanism. In addition, since the paper is returned to create a 1-inch cut margin, paper waste can be further reduced.

[Brief explanation of the drawing]

Figures 1 (a) to (c) are side views of a paper transport mechanism showing an embodiment of the present invention, Figure 2 is a configuration diagram of the control system of the paper transport mechanism, and Figure 3 is a flowchart of the operation in Figure 1. It is. Continuous paper, 2: motor, 3: belt, 4: tractor,
5 Nibraten, 6: T pulley, 7: P pulley, 8: Positioning sensor, 9: Print head, lO: Mask, 11: Paper ejection roller, 12: Opening/closing magnet, 13: Spring, 1
4: Cutter, 15: Sheet tip, 16: Sheet cutting position, 17: Current sheet, 18: Next sheet, 21:
Control unit, 22: Operation panel, 23: Margin size switch,
24: Continuous printing switch, 25: Host device. Figure 1 Figure 2

Claims (1)

[Claims] (1) In a printing device having a printing means for printing on paper, a conveying means for transporting the paper, and a cutter section for cutting the paper, the cutter section is installed at a distance from the margin dimension at the leading edge of the paper. and when printing after cutting the paper with the cutter section, the conveying means transports the paper in a returning direction until the margin size is reached, and the printing means prints on the surface of the paper. The paper conveyance mechanism of the printing device.