JP2009018923A - Sheet conveying device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet conveying device capable of easily processing jamming with a simple mechanism, and an image forming device with this sheet conveying device. <P>SOLUTION: This sheet conveying device 200 comprises guide parts 231, 232, first conveying means 211, 212, second conveying means 211, 222, and detection means 241, 242. The guide parts 231, 232 selectively releases a conveying path. The first conveying means 211, 212 are arranged on an upstream side of the guide parts 231, 232 in a sheet conveying direction. The second conveying means 221, 222 are arranged on a downstream side of the guide parts 231, 232 in a sheet conveying direction. The detection means 241, 242 detects conveying failure of the sheets passing through the first conveying means 211, 212 and the second conveying means 221, 222. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheet conveying apparatus that conveys a sheet from a sheet feeding unit to a sheet discharging unit, and an image forming apparatus including the sheet conveying apparatus.

  When a jam occurs in the paper transport device, it is necessary to operate the paper transport device according to a predetermined procedure in order to handle the jam, which is troublesome and cumbersome.

Therefore, when a jam occurs, the door is opened as the conveyance path opening means to open the conveyance path, and the user removes the jammed paper from the paper conveyance device. There has been proposed a purge processing technique for forcibly automatically discharging a sheet when the sheet still remains in the conveyance path (see, for example, Patent Document 1).
JP 2001-158666 A

  However, the conventional technique described in Patent Document 1 has a disadvantage because it requires a complicated mechanism only for jam processing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper transport device that can easily perform jam processing with a simple mechanism, and an image forming apparatus including the paper transport device.

  The sheet conveying apparatus of the present invention includes a guide unit, a first conveying unit, a second conveying unit, and a detecting unit. The guide part selectively opens the conveyance path. The first transport unit is disposed upstream of the guide unit in the paper transport direction. The second transport unit is disposed downstream of the guide unit in the paper transport direction. The detection means detects a conveyance abnormality of the paper passing through the first conveyance means and the second conveyance means. When the detection unit detects a paper conveyance abnormality, the control unit causes the sheet to bend using the first conveyance unit and the second conveyance unit.

  The guide unit is configured to open the conveyance path by pressing with a bent sheet.

  In this configuration, the jammed sheet automatically goes out of the conveyance path without requiring a complicated mechanism.

  In this configuration, it is preferable that the first transport unit can perform forward feed or stop, and the second transport unit can perform forward feed, stop, or post feed. Jam processing can be easily performed by causing the control means to perform forward feed, stop, and reverse feed according to the state of the conveyance abnormality.

  The paper conveying device of the present invention is preferably provided in an image forming apparatus.

  The paper conveying apparatus according to the present invention can easily perform jam processing with a simple mechanism.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a paper transport device and an image forming apparatus including the paper transport device according to the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. The image forming apparatus 100 includes a CPU 110, a RAM 120, a ROM 130, an HDD 140, a paper transport device 150, an image forming unit 160, an operation panel controller 170, an operation panel 175, a reading unit 180, and detection sensors 241 and 242. The detection sensors 241 and 242 correspond to the detection unit of the present invention.

  The CPU 110 comprehensively controls the RAM 120, ROM 130, HDD 140, paper transport device 150, image forming unit 160, operation panel controller 170, reading unit 180, and detection sensors 241 and 242.

  The RAM 120 is used as a working area for the CPU 110.

  The ROM 130 stores a program for causing the CPU 110 to execute.

  The HDD 140 stores print data spools and analyzed print data.

  The paper transport device 150 transports paper from the paper feed unit to the paper discharge unit.

  The image forming unit 160 forms an image on the conveyed paper.

  The operation panel controller 170 controls display on the operation panel 175.

  The reading unit 180 reads image information on a sheet placed on the reading unit 180.

  The detection sensors 241 and 242 are provided to detect a paper conveyance abnormality.

  Hereinafter, details of the sheet conveying device 150 will be described.

  2 and 3 are diagrams showing the configuration of the sheet conveying apparatus. The paper transport apparatus 200 includes transport rollers 211, 212, 221, 222, a paper guide 230, openable paper guides 231, 232, and detection sensors 241, 242. The transport rollers 211 and 212 correspond to the first transport unit of the present invention. The transport rollers 221 and 222 correspond to the second transport unit of the present invention. The openable paper guides 231 and 232 correspond to the guide portion of the present invention.

  Conveying rollers 211, 212, 221, 222 convey the paper 250 to the image forming unit 160.

  The paper guide 230 is a member that constitutes a conveyance path. A part of the paper guide 230 is provided with openable paper guides 231 and 232.

  The openable paper guides 231 and 232 selectively open the conveyance path. The openable paper guides 231 and 232 are floatingly supported by springs 261 and 262, respectively. The springs 261 and 262 have an elastic force enough to lose the force when the openable paper guides 231 and 232 are pressed by the bending of the paper 250.

  The detection sensors 241 and 242 are provided for detecting a conveyance abnormality of the paper 250.

  When the conveyance abnormality of the paper 250 is not detected, the conveyance rollers 211, 212, 221, and 222 are rotating forward.

  FIG. 2A shows a state in which the sheet 250 has a conveyance abnormality and is detected by the detection sensor 242. When the conveyance abnormality of the paper 250 is detected, the conveyance rollers 211, 212, 221, 222 are stopped.

  Next, the state shifts to the state of FIG. The conveyance rollers 211 and 212 rotate forward, and the conveyance rollers 221 and 222 rotate reversely to bend the sheet 250.

  Next, the state shifts to the state of FIG. The pressure of the sheet 250 bent by the rotation of the conveying rollers 211, 212, 221, 222 is applied to the paper guides 231, 232, and the paper guides 231, 232 open the conveying path.

  Next, the state shifts to the state of FIG. When the leading edge of the paper 250 passes through the transport rollers 211 and 212, the rotation of the transport rollers 211 and 212 stops. As a means for detecting that the leading edge of the sheet 250 has passed through the conveying rollers 211 and 212, the detection sensor 241 may be used, or the CPU 110 reads a change in the torque of the conveying rollers 211 and 212 and rotates it. You may control.

  Next, the state shifts to the state of FIG. The paper guide 231 that is no longer pressed by the bending of the paper 250 closes the conveyance path by the elasticity of the spring 261.

  Next, the state shifts to the state of FIG. When the leading edge of the paper 250 passes through the transport rollers 221 and 222, the rotation of the transport rollers 221 and 222 stops. The means for detecting that the leading edge of the paper 250 has passed through the conveying rollers 221 and 222 may use the detection sensor 242, or the CPU 110 reads the torque change of the conveying rollers 221 and 222 and rotates it. You may control. In addition, the paper guide 232 that is no longer pressed by the bending of the paper 250 closes the conveyance path by the elasticity of the spring 262. Here, the sheet 250 is exposed from the conveyance path. Therefore, the user can easily remove the sheet 250 in which the conveyance abnormality has occurred.

  In this embodiment, the conveyance rollers 211 and 212 are rotated forward and the conveyance rollers 221 and 222 are rotated reversely to bend the paper 250. In addition, the conveyance rollers 211 and 212 are rotated forward to convey the conveyance rollers 221 and 221. 222 may be stopped to bend the sheet 250, or the conveying rollers 211 and 212 may be stopped and the conveying rollers 221 and 222 may be reversed to bend the sheet 250. By changing the rotation control depending on the position where the conveyance abnormality of the sheet 250 occurs, the sheet 250 can be efficiently exposed from the conveyance path.

  In the present embodiment, the openable paper guide is considered to be divided into two, but may be one, or may be divided into three or more. This is because any structure that can open the conveyance path may be used.

  In the present embodiment, the first transport unit and the second transport unit are illustrated as transport rollers, but other types such as a belt-type transport unit and an air-type transport unit may be used. Depending on the application and form of the paper transport apparatus 200, it can be used properly.

  The detection sensors 241 and 242 of the present embodiment may be optical sensors or contact sensors. The form is not limited as long as a paper conveyance abnormality can be detected.

  The paper transport apparatus 200 according to the present embodiment can be applied to any location of the image forming apparatus 100. It is effective when applied to a place where a paper conveyance abnormality is likely to occur, for example, a place where the conveyance path is curved.

  Finally, the description of the above-described embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. It is a figure which shows the structure of the paper conveying apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the paper conveying apparatus which concerns on embodiment of this invention.

Explanation of symbols

200-paper transport device 211, 212-transport roller (first transport means)
221 and 222-conveying rollers (second conveying means)
231,232-Openable paper guide (guide part)
241,242-detection sensor (detection means)

Claims (6)

An openable / closable guide section that selectively opens the conveyance path;
First conveying means disposed on the upstream side of the guide portion in the conveying path;
Second conveying means disposed downstream of the guide portion in the conveying path;
Detection means for detecting a conveyance error of the paper passing through the first conveyance means and the second conveyance means;
Control means for causing the sheet to bend using the first conveying means and the second conveying means when the detecting means detects an abnormality in conveying the paper;
With
The guide unit is a sheet conveying device configured to open a conveying path by pressing with a bent sheet. The first conveying means can be forwarded or stopped,
The sheet conveying apparatus according to claim 1, wherein the second conveying unit is capable of forward feeding, stopping, or backward feeding.   3. The paper conveyance according to claim 1, wherein when the detection unit detects a paper conveyance abnormality, the first conveyance unit is forward-fed and the second conveyance unit is post-fed to cause the paper to bend. 4. apparatus.   3. The paper transport apparatus according to claim 1, wherein when the detection unit detects a paper transport abnormality, the first transport unit is moved forward and the second transport unit is stopped to cause the paper to bend. .   3. The paper transport device according to claim 1, wherein when the detection unit detects a paper transport abnormality, the first transport unit is stopped and the second transport unit is moved backward to cause the paper to bend. 4. .   An image forming apparatus comprising the sheet conveying device according to claim 1.

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