JP2008120510A - Paper delivering device, and image forming device provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly convey paper regardless of a difference in postprocessors connected to a downstream side. <P>SOLUTION: A paper guide is formed to be easily attached to the outlet of a paper conveying device 2, and the shape of a holder 8 of the paper guide 7 is changed or the fixing position thereof is changed, thereby the shape of a guide sheet 9 of the paper guide 7 is formed into a shape that can guide suitably. Thereby, paper is smoothly conveyed, and the highly reliable paper conveying device not damaging paper is realized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus, and more particularly to a sheet conveying apparatus therefor.

  Providing a guide for guiding the paper to the vicinity of the nip portion of the conveying roller pair is an effective means for smoothly entering the paper into the conveying roller pair, and is similar to the paper feeding device disclosed in Patent Document 1. In addition, as a guide shape that guides only to the vicinity of the nip portion of the conveying roller pair, the reliability of paper feeding is increased. In addition, as in the paper transport device disclosed in Patent Document 2, a guide sheet on a thin plate that guides the paper to the vicinity of the nip portion of the transport roller pair is used to reduce the rubbing noise between the paper and the guide sheet when transporting the paper. In addition, a mechanism for retracting the guide sheet from the vicinity of the nip portion during sheet conveyance is disclosed.

JP-A-63-160946 Japanese Patent Laid-Open No. 10-212048

  The post-processing apparatus of the image forming apparatus is different in the mechanism of the post-processing apparatus connected depending on the required post-processing function. In each post-processing apparatus, even if the height of the paper introduction path at the entrance is the same, there are cases where the conveyance direction is on the same conveyance surface, the case where the conveyance direction is an up-down diagonal direction, or the like. Therefore, due to the difference in the paper introduction path of the post-processing device, there is a case where the posture of the paper entering the pair of transport rollers at the entrance of the post-processing device is poor and the paper does not smoothly bite into the pair of transport rollers. It may cause damage such as scratches on the edges.

  In recent years, demand for image forming apparatuses in the printing industry has expanded, and sheets printed with image forming apparatuses have become commodities. The output paper reduces damages such as scratches, and it is necessary to take measures against even small scratches.

  An object of the present invention is to provide a highly reliable paper transport apparatus that realizes smooth paper transport regardless of any post-processing apparatus connected, except for this problem.

  To achieve the above object, according to a first means of the present invention, in the sheet conveying apparatus of the image forming apparatus in which the post-processing apparatus is connected downstream in the sheet conveying direction, the sheet reaches the vicinity of the nip portion of the conveying roller pair of the post-processing apparatus. Is provided so that it can be attached to the exit of the paper transport device.

  The second means of the present invention is characterized in that, in the first means, the shape of the paper guide differs depending on the paper introduction path of the post-processing device.

  According to a third means of the present invention, in the first means, the paper guide can be adjusted in a paper transport direction.

  According to a fourth means of the present invention, in the first means, the paper guide is composed of a holder and a flexible sheet.

  In the conventional paper transport device having a fixed paper guide, it has not been possible to achieve smooth paper transport without providing optimum guidance according to the paper introduction path of various post-processing devices connected downstream. .

  In the present invention, the paper guide can be easily attached, and by changing the shape of the holder of the paper guide or changing the fixing position, the shape of the guide sheet of the paper guide becomes a shape that can be optimally guided. Paper conveyance can be realized, and a highly reliable paper conveyance device that does not cause paper scratches can be realized.

  As described above, according to the present invention, the sheet guide for guiding the sheet to the vicinity of the nip portion of the inlet conveyance roller pair of the post-processing apparatus connected to the downstream side can be easily attached to or detached from the outlet of the sheet conveyance apparatus. Arrange by mechanism. The paper guide has a simple configuration of a holder and a flexible sheet, and the flexible sheet is obtained by exchanging a plurality of holders having different shapes according to the paper introduction path of the connected post-processing device. It is devised so that it can be held and deformed at an optimum position depending on the shape of the holder, or the tip position of the flexible sheet can be adjusted by shifting the fixing position of the holder.

  Next, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 are side views of a sheet conveying apparatus according to each embodiment of the present invention. FIG. 1 is an example of a post-processing apparatus having a sheet introduction path on the same conveying surface as the sheet conveying apparatus. FIG. 3 shows an example of a post-processing device having a paper introduction path in an obliquely upward direction with respect to the transport device, and FIG. 3 shows an example of a paper transport device in which the paper guide can be adjusted in the paper guide direction.

  In FIG. 1, reference numeral 2 denotes a paper transport device connected to an image forming apparatus main body (not shown) such as a printer. Reference numeral 4 denotes a post-processing device connected to the paper transport device 2, which has a paper transport path on the same transport surface as the paper transport device 2.

  A sheet 1 printed by an image forming apparatus (not shown) is conveyed by a conveying roller pair 3 of a sheet conveying apparatus 2. By being fixed to the paper transport device 2 with screws 11, the paper is guided by a paper guide 7 configured to be easily detachable, and is transported through a paper inlet entrance guide pair 5.

  The paper guide 7 includes a holder 8 and a flexible sheet 9, and the flexible sheet 9 is deformed and held at an optimum position near the nip portion of the conveying roller pair 6 by the shape of the holder 8. In general, the opening width A of the inlet guide pair 5 of the post-processing device 4 is wide in order to smoothly transfer the paper between the devices. For this reason, the paper entry posture becomes unstable with respect to the conveyance roller pair 6, but the paper 1 smoothly enters the conveyance roller pair 6 by the flexible sheet 9 of the paper guide 7. Similarly, as shown in FIG. 2, even in the case of the post-processing device 10 having the paper introduction path in the obliquely upward direction with respect to the paper transport device 2, the holder 8 is replaced with a shape suitable for the post-processing device 10. The flexible sheet 9 is deformed to an optimum position in the vicinity of the nip portion of the conveying roller pair 6, and the sheet 1 can be easily pushed into the conveying roller pair 6 smoothly.

  In FIG. 3, the holder 8 of the paper guide 7 is movable up and down and is fixed by screws 11. The flexible sheet 9 of the sheet guide 7 comes into contact with the end of the exit guide 12 of the sheet conveying device 2 depending on the mounting position of the holder 8, and the position of the leading end changes with the contact portion as a fulcrum. By changing the attachment position of the holder 8 at the front end of the flexible sheet 9 of the paper guide 7, the optimum position near the nip portion of the conveyance roller pair 6 can be obtained, and the paper 1 can smoothly enter the conveyance roller pair 6. It will be easy.

It is a side view of the paper conveying apparatus which concerns on embodiment of this invention. It is a side view of the paper conveying apparatus which concerns on embodiment of this invention. It is a side view of the paper conveying apparatus which concerns on embodiment of this invention.

Explanation of symbols

  1 is a sheet, 2 is a sheet conveying apparatus of the image forming apparatus, 3 is a conveying roller pair of the sheet conveying apparatus, 4, 10 is a post-processing apparatus, 5 is an inlet guide pair of the post-processing apparatus, 6 is a conveying roller pair, and 7 is A sheet guide, 8 is a holder, 9 is an elastic sheet, 11 is a screw, and 12 is an exit guide of the sheet conveying apparatus.

Claims (5)

  In a paper transport device of an image forming apparatus in which a post-processing device is connected downstream in the paper transport direction, a paper guide that guides paper to the vicinity of the nip portion of the transport roller pair of the post-processing device can be attached to the exit of the paper transport device A sheet conveying apparatus characterized by being provided.   2. The paper conveying apparatus according to claim 1, wherein the paper guide has a different shape according to a paper introduction path of the post-processing apparatus.   2. The paper transport apparatus according to claim 1, wherein the paper transport direction of the paper guide is adjustable.   The paper transport apparatus according to claim 1, wherein the paper guide includes a holder and a flexible sheet.   An image forming apparatus comprising the sheet conveying device according to claim 1.

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