JP2003171052A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decurl a paper sheet. <P>SOLUTION: This printer 1 is provided with a transfer part 8 pulling out the paper sheet 7 rolled into a roll and transferring it along a paper transfer route 10, a printing part 4 provided in the paper transfer route 10 and printing the paper sheet 7, and a cutter 5 provided in the paper transfer route 10 and cutting the paper sheet 7. This printer is also provided with a decurler 6 decurling the paper sheet 7 in the down stream side of the cutter 5 in the paper transfer direction A in the paper transfer route 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for printing on a sheet of paper wound in a roll.

[0002]

2. Description of the Related Art Conventionally, there is a printer in which a paper wound in a roll is used as a print medium, and the printed paper is cut and used at an appropriate position.

Such a conventional printer will be described with reference to FIG. In the printer 100, the roll-shaped paper 102 held in the paper holding unit 101 is the platen 103.
And is conveyed through the sheet conveyance path 104, and the printing unit 105 prints a predetermined item during the conveyance. After that, the paper 102 is cut at a predetermined position by the cutter 106. The cut sheet 102 is dropped and stored in the sheet storage unit 107.

The cutter 106 for cutting the paper 102 is, for example, a fixed blade 108 and a movable blade 109 which is rotated by sliding the blade portions relative to the fixed blade 108.
There is a rotary cutter constituted by arranging the sheet and the sheet with the sheet conveyance path 104 sandwiched therebetween. In the cutter 106, which is such a rotary cutter, the transported paper 102 is conveyed.
Is cut by the fixed blade 108 and the movable blade 109 meshing with each other.

[0005]

By the way, the paper 102 wound in a roll has a curl depending on its winding diameter. Here, FIG. 6 shows a state in which the cut sheet 102 with the curl is placed on the flat surface S. As shown in FIG. 6, the sheet 102 is curved in an arc shape due to the curl. When the winding diameter is small, the paper 102 has a strong winding habit, so that the paper 102 is cut into the paper storage unit 1 after cutting.
When it is stored in 07, it is stored in the paper storage unit 107 with a curl as shown in FIG. This allows
After that, it becomes difficult to store the cut paper 102 in the paper storage unit 107, and the cut paper 102 overlaps the entrance of the paper storage unit 107 in a disordered state or falls to a place other than the paper storage unit 107. There may be problems such as Here, the sheet 102 that falls to a place other than the sheet storage unit 107 is shown by a virtual line in FIG. 7.

If the cut sheet 102 overlaps the entrance of the sheet storage unit 107 in a disordered state, the cut sheet 102 will protrude from the sheet storage unit 107 toward the main body of the printer 100. Sometimes. In this way, the paper 102 protruding to the main body side of the printer 100
If the sheet returns to the cutter 106, a problem may occur in that the sheet 102 is cut and cut twice together with the sheet 102 to be cut next.

[0007] Further, the sheet 1 after cutting in a state with a curl
When 02 is attached to a flat object to be attached,
The curl may cause the paper 102 to peel off in an attempt to return to a curved state.
In order to prevent such peeling of the paper 102, it is necessary for an operator to manually remove the curl, which is troublesome.

An object of the present invention is to correct the curl of paper.

[0009]

SUMMARY OF THE INVENTION A printer of the present invention is a roll for correcting a curl of a sheet on a downstream side in a sheet transport direction with respect to a cutter in a sheet transport path along which a sheet wound in a roll is drawn and transported. Equipped with a habit correction device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic side view showing the printer 1. A main body case 2 is provided in the printer 1, and a paper holding unit 3, a printing unit 4, a cutter 5, and a curl correction device 6 are provided in the main body case 2.

A paper 7 wound in a roll is held in the paper holder 3. Here, in the present embodiment,
The direction of setting the paper 7 is the outer peripheral surface (print surface) of the drawer
The side faces up. In addition, the printing unit 4
It is composed of a roller-shaped platen 8 which is driven by a drive source (not shown) and is rotatable, and a print head 9 which comes into contact with and separates from the platen 8. The platen 8 also functions as a transport unit that transports the paper 7 in the paper transport direction A. Further, the main body case 2 is provided with a paper conveyance path 10 which starts from the paper holding portion 3 and which passes between the platen 8 and the print head 9 and reaches the cutter 5.

The cutter 5 is a fixed blade 11 having a flat plate shape.
And the movable blade 12 are combined, the fixed blade 11 is provided above the sheet conveying path 10, the movable blade 12 is provided below the sheet conveying path 10, and the two blades 11 and 12 are separated when not in operation. It is considered as a structure. These fixed blades 11
The movable blade 12 and the movable blade 12 are positioned so as to be slightly inclined from the parallel position and mesh with each other like scissors. In other words, the cutter 5 meshes the fixed blade 11 and the movable blade 12 and moves the meshing position to move the paper transport path 10
This is a rotary cutter having a structure for cutting the sheet 7 conveyed. Here, the movable blade 12 forms a part of the paper transport path 10.

The movable blade 12 in such a cutter 5 uses a stepping motor (not shown) as a drive source, and receives a driving force from the stepping motor activated based on the activation signal to swing around the spindle 13. It is driven by using the moving cutter arm 14 as a power transmission medium. That is, the plate cam 15 that is driven to rotate by the stepping motor is provided, and the cutter arm 14 is connected to the plate cam 15 as a follower joint so as to form a cam mechanism that uses the plate cam 15 as a driving joint. Therefore, when the cutter arm 14 rotates from the predetermined position by the predetermined amount, the movable blade 1 fixed to the tip thereof is
2 is rotationally driven, and the fixed blade 11 and the movable blade 12 mesh with each other. Then, the support shaft 13, the cutter arm 14, and the plate cam 15 constitute a transmission mechanism 16 for transmitting the driving force of the stepping motor to the movable blade. Here, the position of the movable blade 12 when not in operation is the movable blade initial position, and the position of the movable blade 12 that has been rotated by the maximum amount is the movable blade advance position.

The curl correction device 6 is provided downstream of the cutter 5 in the sheet conveying direction A and corrects the curl of the sheet 7. The curl correction device 6 is composed of a movable guide 17, a fixed guide 18, and the like, which are arranged opposite to each other with the sheet conveyance path 10 interposed therebetween.

The movable guide 17 is formed in the shape of a flat plate having a width substantially the same as the width of the sheet 7 and forms a part of the sheet conveying path 10. The movable guide 17 has a movable guide initial position in which the upper surface of the movable blade 12 located at the movable blade initial position and the upper surface of the movable guide 17 are substantially parallel to each other, and the sheet conveyance path 10 formed together with the upper surface of the movable blade 12 is flat. The rotary shaft 19 is fixed so as to be rotatable between the movable blade 12 rotated to the movable blade advancing position and the movable guide advancing position that bends the sheet conveying path 10 into a V shape. A gear 21 that meshes with a gear 20 formed at one end of the cutter arm 14 on the support shaft 13 side is fixedly provided at one end of the rotary shaft 19. In the curl correction device 6, when the movable blade 12 is rotated about the support shaft 13, the movable guide 17 rotates in the opposite direction to the rotation direction about the rotation shaft 19 by the same amount as the movable blade 12. Thus, the movable blade 12 and the movable guide 17 are configured to form a V shape when viewed from the side.

The fixed guide 18 has a width substantially the same as the width of the sheet 7, and a V-shaped bent portion 18a bent in a V shape is formed at the lower end portion thereof. The back surface of the V-shaped bent portion 18a faces the upper surfaces of the movable blade 12 and the movable guide 17, both of which are rotated to the advanced position, in parallel with each other with a predetermined gap. As a result, when both the movable blade 12 and the movable guide 17 are rotated to the advanced position, the paper transport path 10 is V-shaped.
It is bent into a letter shape.

In addition, at the front end of the main body case 2, there is provided a paper storage unit 22 for storing the cut paper 7.

In such a structure, the paper 7 held by the paper holding unit 3 is driven by the platen 8 and is conveyed in the paper conveying path 10 in the paper conveying direction A while being conveyed by the print head 9. Items are printed in sequence. When printing is completed, the trailing edge of the sheet 7 is cut by driving the movable blade 12 of the cutter 5. Along with this cutting operation, the curl correction device 6 corrects the curl of the paper 7 to correct the curl of the paper 7. The sheet 7 after the curl is corrected is discharged and stored in the sheet storage unit 22.

The curl correction operation of the curl correction device 6 will be described with reference to FIGS. 2 to 4 together with the operation of the movable blade 12 in the cutting operation of the cutter 5. Movable guide 1
7 cooperates with the movable blade 12 to press the paper 7 against the fixed guide 18 so as to correct the curl of the paper 7. Specifically, first, when the movable blade 12 is driven in the cutting operation of the cutter 5 to rotate from the initial position of the movable blade to the advanced position of the movable blade to start cutting the sheet 7, the movable guide 17 is simultaneously moved. Rotate from the movable guide initial position to the movable guide advance position.

Then, the sheet 7 on the movable blade 12 and the movable guide 17 is rotated by the rotation of the movable blade 12 and the movable guide 17.
Is pressed against the V-shaped bent portion 18 a of the fixed guide 18 by the movable blade 12 and the movable guide 17. As a result, the movement of the pressed sheet 7 is restricted.

Further, the movable blade 12 is driven to rotate together with the movable guide to the advanced position, whereby the cutting of the sheet 7 by the movable blade 12 is completed, and at the same time, as shown in FIG. Guide 17 and fixed guide 1
It is bent into a V-shape when viewed from the side between the V-shaped bent portion 18a of FIG. The direction in which the sheet 7 is bent at this time is opposite to the curl of the sheet 7. As a result, the curl attached to the paper 7 is corrected.

Thereafter, as shown in FIG. 3, the movable blade 12 is driven to rotate so as to return to the movable blade initial position, whereby the movable guide 17 is also rotated so as to return to the movable guide initial position. Then, as shown in FIG. 4, the paper 7 after the curl is corrected is stored in the paper storage unit 22.

As described above, in the present embodiment,
Since the curl attached to the paper 7 can be corrected by the curl correction device 6, the paper 7 can be reliably stored in the paper storage unit 22. Further, the succeeding sheets 7 can be stored in the sheet storage unit 22 in a stacked state, and the sheet 7 can be prevented from dropping to a place other than the sheet storage unit 22. Further, since the paper 7 is reliably stored in the paper storage unit 22,
The sheet 7 after being cut does not return to the cutter 5 and the double cutting of the sheet 7 can be avoided.

Further, the curl correction device 6 is driven by a stepping motor which is a drive source of the cutter 5 to bend the paper conveyance path 10 in a direction for correcting the curl of the paper 7, so that the curl correction device 6 is driven. It is possible to suppress the increase in size and cost of the printer 1 by providing the curl correction device 6 as much as possible, without requiring a drive source only for the purpose.

Further, since the driving force from the stepping motor is transmitted to the curl correction device 6 via the transmission mechanism 16 of the cutter 5, it is possible to further suppress the increase in size and cost of the printer 1. .

[0027]

According to the printer of the present invention, the curl of a sheet can be corrected by the curl correction device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a printer according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a curl correction operation of a sheet by the curl correction device.

FIG. 3 is a vertical cross-sectional side view showing a curl correction operation for a sheet by the curl correction device.

FIG. 4 is a vertical cross-sectional side view showing a state in which a corrected sheet is stored in a sheet storage unit.

FIG. 5 is a vertical sectional side view showing a conventional printer.

FIG. 6 is a side view showing a state in which the cut sheet with a curl is placed on a flat surface.

FIG. 7 is a side view showing a state of sheets that are overlapped with each other in a state of being disturbed at the entrance of the sheet storage unit and fall to a place other than the sheet storage unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printer, 4 ... Printing part, 5 ... Cutter, rotary cutter, 6 ... Curling correction device, 7 ... Paper, 8 ... Conveying part (platen), 10 ... Paper conveying path, 11 ... Fixed blade, 12 ... Movable blade , 17 ... Movable guide, 18 ... Fixed guide

Claims (3)

[Claims] 1. A transport unit that pulls out a roll of paper and transports it along a paper transport path; a printing unit that is provided in the paper transport path and prints on the paper; A printer provided with a cutter for cutting the sheet, and a curl correction device for correcting the curl of the sheet, which is provided on a downstream side of the cutter in the sheet transport direction in the sheet transport direction. 2. The printer according to claim 1, wherein the curl correction device is driven by a drive source that drives the cutter to bend the paper conveyance path in a direction for correcting the curl of the paper. 3. The cutter has a fixed blade and a movable blade which are arranged to face each other with the sheet conveyance path sandwiched therebetween, and the cutter has a meshing position of the movable blade and the fixed blade as the movable blade rotates. A rotary cutter that cuts the sheet by movement, the curl correction device has a fixed guide and a movable guide that are arranged to face each other across the sheet transport path, the movable blade and the movable guide, Forming a part of the sheet conveyance path, the movable guide is driven by the drive source in accordance with the cutting operation of the rotary cutter and rotates in a direction opposite to the movable blade, and cooperates with the movable blade. 3. The printer according to claim 2, wherein the printer presses the paper against the fixed guide so as to correct the curl of the paper.