JP2000226143A - Paper carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent recording papers from being reversely curled by a decurling means in a waiting state when a device is out of operation, and try to stabilize paper carrying performance when a machine glazed paper is used. SOLUTION: A solenoid device 25 is turned off when a machine glazed paper carrying device is out of operation so as to enable a lever body 24 to be moved to an evacuation position. Namely, when the solenoid device 25 is turned off, an operation stem 25a is set free, a decurling part 22 is just rested over the surface of a recording paper P stretched between the core 3 of the machine glazed paper 4 and a carrying roller 5, and no decurling action is applied to the recording paper P, and thus the recording paper P is not curled reversely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an image recording section using a roll paper as a recording paper in a copying machine, a printer, a facsimile apparatus, and the like. The present invention relates to a paper transport device provided with a configuration for performing the correction).

[0002]

2. Description of the Related Art Conventionally, in a paper transport device configured to pull out a recording paper wound in a roll shape and cut it into a predetermined length for use, the recording paper is stored in a roll shape. If the sheet is conveyed in a predetermined direction as it is curled in the roll winding direction, the conveyance operation of the conveyance means will not be hindered, or a good stacking state will not be achieved when the sheet is discharged.

[0003] For this reason, some printers have a decurling means for removing the curl attached to the recording paper. As a decurling means, there is a means in which a roller or a plate is provided in a recording paper conveying path, and the recording paper is decurled by bending the recording paper in a direction opposite to the curl direction. A configuration that is devised so as to be adapted and a configuration corresponding to the configuration of various image recording units have been proposed and implemented (Japanese Utility Model Application Laid-Open No. 60-165342).
JP-A-5-41769, JP-A-6-98
No. 078).

[0004]

However, in the above-mentioned conventional decurling means, since the decurling action is always applied to the recording paper, if the apparatus is not driven for a long time, the decurling means However, there is a problem that a reverse curl occurs in a portion of the recording paper in contact with the recording paper.

The present invention solves the above-mentioned conventional problem, and can prevent the recording paper from being reversely curled by the decurling means at the time of standby during non-driving time.
It is an object of the present invention to provide a paper transport device capable of stabilizing the paper transport performance.

[0006]

In order to achieve the above object, the present invention is directed to a conveying means for pulling out and conveying a recording paper wound in a roll form, and a conveying means provided at a downstream side of the conveying means in the recording paper conveying direction. Wherein the decurling unit comprises a cutter unit for cutting the recording paper pulled out by a predetermined length, and a decurling unit provided at an upstream side of the conveying unit in the recording paper conveying direction to correct the curl of the recording paper. Means are provided so as to be movable between an operation position for performing curl correction on the recording paper and a retract position where curl correction is released, and the decurling means is moved to the retract position when the apparatus is not driven.

Further, according to the present invention, the decurling means has a configuration in which the other end portion of a lever body having a decurling portion for performing curl correction in contact with a recording sheet at one end portion is rotatably supported. Is provided with an actuating means for rotating between the operating position and the retracted position.

In the present invention, the operating means may be a spool member provided on a portion of the recording paper wound in a roll shape and rotated with the portion, and the lever member may be rotated by the spool member. It was done.

Further, in the present invention, a torque limiter is provided on the spool member, and a portion of the recording paper wound in a roll shape can be rotated independently of the spool member when the apparatus is driven.

In the present invention, a spring for holding the lever body at the retracted position is provided, and a load of the spring is set to be smaller than a load of the torque limiter.

According to each of the above-described structures, the curl correction operation on the recording paper by the decurling means is not applied when the apparatus is not driven or in standby, and the curl correction by the decurling means is performed when the apparatus is driven. After the standby, there is no occurrence of reverse curl at the leading end of the recording paper, so that the paper conveyance performance when roll paper is used is improved.
Further, the movement between the decurling position and the retreat position in the decurling means is smoothly performed by the operating means without hindering the conveyance of the roll paper.

[0012]

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

FIG. 3 is a diagram showing the internal configuration of an image recording apparatus equipped with a roll paper transporting apparatus according to the present invention. Reference numeral 1 denotes a plurality (3 in this example) installed below the image recording apparatus main body 2.
The roll paper transport device 1 includes a roll paper 4 wound around a core 3 in a roll shape.
And transport rollers 5 and 6 for pulling out the recording paper from the roll paper 4 and transporting the same, and a transport roller 5 installed on the roll paper 4 side.
A cutter 7 installed at the downstream side in the recording paper transport direction to cut out the extracted recording paper P to a predetermined length;
A decurling unit 8 is disposed upstream of the transport roller 5 in the transport direction of the recording paper to correct the curl of the recording paper P.

In FIG. 3, inside the image recording apparatus main body 2, a photosensitive drum 10, an optical unit 11 for emitting a light beam L for exposing the photosensitive drum 10, a cleaning section 12, a charging section 13, Developing unit 14 and transfer unit 15
Is mounted.
In the image forming processing unit 16, the recording paper P, which is cut into a predetermined length by the cutter 7 of each roll paper conveying device 1 and conveyed by a plurality of conveying rollers 17, is transferred to the photosensitive member in the transfer unit 15 in a known manner. The image is formed by transferring the image from the drum 10, and the recording sheet P after the transfer passes through the fixing unit 18, and is discharged to the outside by a plurality of transport rollers 19.

FIG. 1 is a block diagram showing a main part of a roll paper conveying device for explaining a first embodiment of the present invention.
Is a storage portion for storing the roll paper 4, and 21 is a concave portion provided so that a decurling portion 22 which directly acts on the recording paper P in the decurling means 8 can be moved. The decurling means 8 includes a lever body 24 provided with an axial decurling portion 22 extending in the width direction on the surface side of the recording paper P at one end portion 24 a and the other end portion 24 b rotatably supported by a fulcrum 23. Consists of An operating rod 25 a provided on a solenoid device 25 as an operating member is connected to the other end 24 b of the lever body 24.

The solenoid device 25 is controlled by a control unit (not shown), and is turned on when the roll paper transport device for transporting the paper is driven, and pulls the operating rod 25a by the electromagnetic action as shown in FIG. Lever 2
4 is rotated clockwise about the fulcrum 23, and the decurling unit 22 presses down on the surface of the recording paper P in a state where it is pulled by the core 3 of the roll paper 4 and the transport roller 5. The habit is corrected (decaled).

However, the solenoid device 25 is turned off when the roll paper transport device is not driven, and allows the lever body 24 to move to the retracted position as shown in FIG. That is, when the solenoid device 25 is off, the operating rod 25a
Is set in a free state, so that the decurling portion 22 only rides on the surface of the recording paper P stretched by the core 3 of the roll paper 4 and the transport roller 5, and the recording paper P is decurled. Is not added and the recording paper P is not curled in reverse.

At the time of driving, the solenoid device 25 is turned on again to pull the operating rod 25a, and the decurling unit 2
2 becomes the state shown in FIG. 2, and the decurling of the recording paper P is performed as described above.

FIG. 4 is a structural view showing a main part of the roll paper transport device when the roll paper transport device is not driven for explaining the second embodiment of the present invention, and FIG. FIG. 6 is a configuration diagram illustrating a part, and a difference between the second embodiment and the first embodiment is a configuration of an operation member that operates a lever body 24 provided with a decurling part 22.

That is, in the second embodiment, as shown in a cross-sectional view of one end portion of the roll paper 4 in FIG. 6 and an exploded perspective view of the same portion as FIG. 6 in FIG. A collar 30 is fitted to the end, and this collar 30
When the winding core 3 and the roll paper 4 rotate with respect to the spool 32 when the receiving cylinder portion 32b of the spool 32 is fitted with the torque limiter 31 interposed therebetween, the torque limiter 31 causes the torque (load) to be described later. Is caused to occur. An arm portion 32 a is provided on a part of the outer periphery of the spool 32 for abutting against the decurling portion 22 of the lever body 24 and pressing the decurling portion 22. Further, the lever body 24 is provided with a spring 33 for urging the lever body 24 in a direction for moving the lever body 24 to the retracted position in FIG.

When the roll paper transport device for transporting the paper is driven, the transport rollers 5 and 6 operate to pull out the recording paper P from the roll paper 4. Thus, the roll paper 4 rotates counterclockwise together with the core 3, the collar 30, the torque limiter 31, and the spool 32. As shown in FIG.
Causes the arm 32a to rotate counterclockwise.
The arm 32a is connected to the decurling portion 2 of the lever 24.
2 and depresses the decurling portion 22 against the urging force of the spring 33, and in this state, the decurling portion 22 is pulled by the core 3 of the roll paper 4 and the conveying roller 5. By pressing, the curl is decaled.

In this state, even if the arm portion 32a is in contact with the decurling portion 22, the roll paper 4 must rotate in order to pull out the recording paper P from the roll paper 4. For this reason, the torque limiter 31 can maintain the decurled portion 22 pressed down against the urging force of the spring 33, and the core 3 and the roll paper 4 can rotate. As described above, the load is set such that a load causing a slip occurs between the collar 30 integrally fitted to the winding core 3 and the cylindrical receiving portion 32b of the spool 32.
Therefore, the biasing load of the spring 33 is set smaller than the load of the torque limiter 31.

When the roll paper transport device is not driven, the force for pulling out the roll paper 4 is not applied to the recording paper P, and the spring 3
Under the biasing force of 3, the lever 24 moves to the retracted position shown in FIG. In this state, the decurling portion 22 only rides on the surface of the recording paper P stretched by the core 3 of the roll paper 4 and the transport roller 5, and the recording paper P is not decurled. The recording paper P is not curled in reverse.

At the time of driving, the rotation of the roll paper 4 and the spool 32 causes the arm portion 32a to move the spring 3 again.
By rotating counterclockwise against the biasing force of 3,
The arm portion 32a contacts the decurling portion 22 of the lever body 24 and presses the decurling portion 22. Therefore, the decurling unit 22 is in the state shown in FIG. 5, and the decurling of the recording paper P is performed as described above.

[0025]

As described above, according to the present invention,
When the apparatus is not driven or in standby mode, the curl correction action on the recording paper by the decurling means is not applied, so that the reverse curl does not occur at the leading end of the recording paper during startup and after standby, and roll paper is used. In this case, the paper transport performance can be improved.

Further, the decurling means can be moved between the decurling position and the retracted position by the operating means so as not to cause a problem in the transport of the roll paper.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of a roll paper transport device (when not driven) for explaining a first embodiment of the present invention;

FIG. 2 is a configuration diagram showing a main part of the roll paper transport device (during driving) according to the first embodiment of the present invention;

FIG. 3 is a diagram showing an internal configuration of an image recording apparatus equipped with a roll paper transport device according to the present invention.

FIG. 4 is a configuration diagram showing a main part of a roll paper transport device (when not driven) for explaining a second embodiment of the present invention;

FIG. 5 is a configuration diagram illustrating a main part of a roll paper transport device (during driving) according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a configuration of one end portion of a roll paper according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view of the same portion as FIG. 6 according to the second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 roll paper transport device 3 core 4 roll paper 5, 6 transport roller 7 cutter 8 decurling unit 22 decurling unit 23 fulcrum 24 lever body 25 solenoid device 25 a operating rod 30 collar 31 torque limiter 32 spool 32 a arm unit 33 spring

Claims (5)

[Claims] 1. A transport means for pulling out and transporting a recording paper wound in a roll shape, and a cutter means installed at a downstream side of the transport means in a recording paper transport direction and cutting the pulled out recording paper to a predetermined length. And a decurling unit that is disposed upstream of the conveying unit in the recording paper conveying direction and that corrects curling of the recording paper. A paper conveying device, wherein the paper conveying device is provided so as to be movable between a retreat position where correction is released and the decurling unit is moved to the retreat position when the device is not driven. 2. The decurling device according to claim 1, wherein the decurling unit is configured to rotatably support the other end of a lever body provided with a decurling unit for correcting the curl in contact with the recording paper at one end. 2. The paper conveying apparatus according to claim 1, further comprising an operating unit for rotating between the position and the retracted position. 3. The method according to claim 1, wherein the actuating means is a spool member provided on a portion of the recording paper wound in a roll shape and rotating with the portion, and the lever member is rotated by the spool member. 3. The paper transport device according to claim 2, wherein: 4. The recording medium according to claim 3, wherein a torque limiter is provided on the spool member, and a roll portion of the recording paper is rotatable independently of the spool member when the apparatus is driven. Paper transport device. 5. The paper conveying apparatus according to claim 4, wherein a spring for holding said lever body at a retracted position is provided, and a load of said spring is set smaller than a load of said torque limiter.