JP2005172914A - Transfer paper sheet separating mechanism and image forming apparatus provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely a separate transfer paper sheet with high reliability without causing image failure on the transfer paper sheet. <P>SOLUTION: The transfer paper sheet separating mechanism is provided with a sliding contact part 601 coming into sliding contact with a fixing roller 120 in a position corresponding to a range which is within the width of the transfer paper sheet P and on edges of the transfer paper sheet P on which an image is not formed on the fixing roller P and a separating part 602 which is installed adjacent to the sliding contact part 601 separating the transfer paper sheet P stuck to the fixing roller 120. The transfer paper sheet stuck to the fixing roller 120 is separated in a position corresponding to the range on which the image is not formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transfer sheet separating mechanism for preventing a transfer sheet from being wound and an image forming apparatus including the transfer sheet separating mechanism.

  2. Description of the Related Art Conventionally, in an image forming apparatus (printing apparatus, image communication apparatus, copying machine, etc.), a transfer paper to prevent transfer paper onto which a toner image has been transferred from being wrapped around a photosensitive member, a fixing roller or an intermediate transfer member. A separation mechanism is used.

  For example, in a fixing device, a heating roller having a heater inside and a pressure roller are disposed inside a casing of the fixing device, and both rollers are in pressure contact with each other on the outer peripheral surface. The toner on the transfer paper to which the toner is attached is melted by the heat applied from the heating roller. When the toner melts, stickiness is generated, and the transfer paper tends to adhere to the surface of the heating roller.

  As a transfer paper separation mechanism for preventing the transfer paper from being wound around the fixing roller, the separation claw slidably contacted with the outer peripheral surface of the heating roller is rotatably supported by a holding portion and separated by an urging means. The lower surface of the nail is brought into sliding contact with a predetermined pressure. As a result, the transfer paper that has entered the nip portion and has adhered to the peripheral surface of the heating roller can be forcibly separated (see, for example, Patent Document 1).

In addition, a separation plate is provided near the fixing roller over almost the entire length of the fixing roller, and a separation plate is provided near the pressure roller and over almost the entire length of the pressure roller. In some cases, the gap between the separation plate and the fixing roller is set to be shorter than the distance at which the leading edge of the sheet is separated from the fixing roller. As a result, the leading edge of the sheet is slightly separated from the surface of the fixing roller, and the leading edge of the separation plate enters the gap to separate the sheet from the fixing roller (see, for example, Patent Document 2).
JP-A-9-171318 (FIG. 2) Japanese Patent Laid-Open No. 2003-202767 (FIGS. 1 and 2)

  However, this conventional technique has the following problems.

  That is, when the separation claw slidably contacted with the outer peripheral surface of the heating roller is rotatably supported by the holding portion and the lower surface of the separation claw is slidably contacted with a predetermined pressure by the biasing means, the tip of the separation claw Is in contact with the outer peripheral surface of the heating roller at a predetermined position, the outer peripheral surface of the heating roller may be damaged, and the damage occurs in the area of the transfer paper image. There's a problem.

  In addition, when the separation plate is disposed with a predetermined gap over almost the entire length of the fixing / pressure roller, the separation plate is not in contact with the outer peripheral surface of the roller. Although it does not occur, it is difficult to maintain a predetermined interval with high accuracy, and there may be a problem that the transfer paper cannot be separated in a toner adhesion state on the transfer paper or an ambient environment.

  The present invention has been made in view of such problems, and includes a transfer paper separating mechanism that can reliably and reliably separate transfer paper without causing image defects on the transfer paper, and the same. Another object of the present invention is to provide an image forming apparatus.

  The present invention relates to a transfer paper separating mechanism that is in sliding contact with a transfer paper holding member at a position corresponding to a region within the width of the transfer paper on the transfer paper holding member and where no image is formed at the end of the transfer paper. And a separating unit that is connected to the sliding contact portion and separates the transfer paper attached to the transfer paper holding member, and separates the transfer paper attached to the transfer paper holding member at a position corresponding to a region where no image is formed. It is what you do.

  According to the transfer paper separating mechanism and the image forming apparatus equipped with the same according to the present invention, the transfer paper can be reliably and reliably separated without causing an image defect on the transfer paper.

  In the transfer paper separating mechanism according to the first aspect of the present invention, the transfer paper holding member is located at a position within the paper width of the transfer paper on the transfer paper holding member and at a position corresponding to an area where no image is formed at the end of the transfer paper. And a separation unit that separates the transfer paper that is connected to the transfer paper holding member and that is connected to the transfer paper holding member.

  According to this configuration, since the sliding contact portion comes into contact with the end portion of the transfer paper in the transfer paper holding member, the transfer paper can be separated from the end portion, and the transfer paper is reliably and reliably separated. be able to. In addition, since the sliding contact portion contacts the transfer paper holding member at a position within the non-image forming area in the transfer paper in the transfer paper holding member, the image forming area on the outer peripheral surface of the transfer paper holding member can also be brought about by the contact of the sliding contact portion. There is no damage to you. For this reason, it is possible to reliably prevent the occurrence of image defects due to the damage generated on the outer peripheral surface.

  According to a second aspect of the present invention, in the transfer paper separation mechanism according to the first aspect, the separation unit has a length corresponding to the paper width of the transfer paper on the transfer paper holding member, and the sliding contact portion is A configuration is adopted in which a predetermined interval is maintained with respect to the transfer paper holding member from one end to the other end provided.

  According to this configuration, since the separation portion is provided with a certain interval with respect to the transfer paper holding member from one end portion on the sliding contact portion side to the other end portion, the transfer paper is connected to the one end where the sliding contact portion contacts. It can isolate | separate reliably from a part along a separation part.

  According to a third aspect of the present invention, in the transfer paper separation mechanism according to the first aspect, the separation unit has a length corresponding to the paper width of the transfer paper on the transfer paper holding member, and the sliding contact portion is A configuration is adopted in which the gap is widened with respect to the transfer paper holding member from one end to the other end.

  According to this configuration, since the separation portion is provided with a gap widening from the one end portion on the sliding contact portion side toward the other end portion with respect to the transfer paper holding member, the transfer paper is placed on one end portion on the sliding contact portion side. Can be gradually separated toward the other end portion where the interval becomes wider. As a result, it is possible to reduce the impact when separating the transfer paper as compared with the separation unit according to the second aspect, and to perform separation smoothly.

  According to a fourth aspect of the present invention, in the transfer paper separating mechanism according to the first aspect, the separation unit has a length corresponding to the paper width of the transfer paper on the transfer paper holding member, and the transfer paper holding member Arranged on a straight line inclined at a certain angle toward the traveling direction side of the transfer paper adhered to the transfer paper, and is constant with respect to the transfer paper holding member from one end where the sliding contact portion is provided to the other end. A configuration is adopted in which the interval is maintained.

  According to this configuration, the separation unit is arranged at a constant interval with respect to the transfer paper holding member from one end portion on the sliding contact side to the other end portion, and on the traveling direction side of the transfer paper wound around the transfer paper holding member Since the transfer paper is provided on a straight line inclined at a certain angle toward, the transfer paper can be gradually separated along the traveling direction. For this reason, the impact at the time of separating a transfer paper can be reduced, and it can separate smoothly and reliably.

  According to a fifth aspect of the present invention, in the transfer paper separating mechanism according to any one of the first to fourth aspects, the sliding contact portion is within the width of the transfer paper on the transfer paper holding member and within the transfer paper. The transfer sheet holding member is slidably contacted at a position corresponding to the margin area.

  According to this configuration, the sliding contact portion is in sliding contact with the transfer paper holding member at a position within the width of the transfer paper on the transfer paper holding member and corresponding to a blank area in the transfer paper. Since the margin area of the transfer paper can be calculated in advance, the position where the sliding contact portion is in sliding contact with the transfer paper holding member can be easily determined.

  According to a sixth aspect of the present invention, in the transfer paper separating mechanism according to the fifth aspect, the sliding contact portion is located at a position corresponding to a margin area when the position reference of the transfer paper is a one-side reference. The structure that is slidably touched is adopted.

  According to this configuration, since the one end portion on the position reference side of the transfer paper is always fixed, the sliding contact portion can be easily aligned with the transfer paper holding member.

  According to a seventh aspect of the present invention, in the transfer paper separating mechanism according to any one of the first to sixth aspects, the sliding contact portion and the separating portion are made of a stainless material.

  According to this configuration, the sliding contact portion and the separation portion can be configured to have excellent workability, dimensional accuracy, cost, and rigidity.

  According to an eighth aspect of the present invention, in the transfer paper separating mechanism according to any one of the first to seventh aspects, the transfer paper holding member is an intermediate transfer member.

  According to a ninth aspect of the present invention, in the transfer paper separating mechanism according to any one of the first to seventh aspects, the transfer paper holding member is a fixing roller or a pressure roller.

  According to these configurations, the transfer sheet attached to the intermediate transfer body and the fixing roller or the pressure roller can be separated while exhibiting the effects obtained by the transfer sheet separating mechanism according to the first to seventh aspects. .

  The image forming apparatus according to the tenth aspect of the present invention employs a configuration including the transfer paper separating mechanism according to the eighth or ninth aspect.

  According to this configuration, the effect obtained by the transfer paper separating mechanism according to the eighth or ninth aspect can also be realized in the image forming apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an image forming apparatus 100 to which a transfer paper separating mechanism according to an embodiment of the present invention is applied.

  As shown in FIG. 1, the image forming apparatus 100 includes a reading unit 101 that reads a document at the top, and a main body unit 102 that performs paper feeding, development, transfer, and fixing processes below the reading unit 101.

  A paper feed cassette 103 is installed in a lower area of the main unit 102. The uppermost sheet is taken out by the pickup roller 104 from the sheet bundle set in the sheet feeding cassette 103. The paper taken out from the paper feed cassette 103 is fed by a paper feed roller 105 into a paper path 106 formed upward from the bottom of the main unit 102. In the paper path 106, a conveyance roller 107 that conveys the paper further upward is disposed.

  The sheet conveyed by the conveyance roller 107 is transferred to the registration roller 108. A secondary transfer roller 109 is disposed at a destination of the sheet transported by the registration roller 108. The secondary transfer roller 109 is disposed to face the belt conveyance roller 110 among belt conveyance rollers 110 and 111 around which an intermediate transfer belt described later is wound. The secondary transfer roller 109 transfers the color image formed on the intermediate transfer belt onto the conveyed paper. Note that the registration roller 108 controls the position adjustment between the image on the intermediate transfer belt and the recording area of the paper.

  The belt conveyance roller 110 is disposed in the vicinity of the right end portion shown in FIG. 1 of the image forming apparatus 100, and the belt conveyance roller 111 is disposed in the vicinity of the left end portion shown in FIG. The intermediate transfer belt 112 is wound around these belt conveyance rollers 110 and 111. The belt conveying roller 110 is driven by a driving roller, and the intermediate transfer belt 112 rotates in the direction of the arrow in the drawing according to the driving. Below the intermediate transfer belt 112, process units 113 </ b> Y to 113 </ b> K that form yellow (Y), magenta (M), cyan (C), and black (K) images on the surface of the intermediate transfer belt 112 are arranged in parallel. ing.

  Each process unit 113 includes photosensitive drums 114 </ b> Y to 114 </ b> K that carry an image to be transferred to the intermediate transfer belt 112. A latent image is formed by laser light from a laser scan unit (LSU) 115 disposed below the process unit 113 on the surface of each photosensitive drum 114. Opposite to each photosensitive drum 114, developing rollers 116Y to 116K are arranged to visualize the image by attaching toner to the latent image formed on each photosensitive drum 114.

  Primary transfer rollers 117 </ b> Y to 117 </ b> K are provided inside the intermediate transfer belt 112 at positions facing the respective photosensitive drums 114. Each primary transfer roller 117 transfers the image formed on each photosensitive drum 114 to the intermediate transfer belt 112. The primary transfer rollers 117 </ b> Y to 117 </ b> K transfer the images of the respective colors at the same position so that a color image is formed on the intermediate transfer belt 112. The color image on the intermediate transfer belt 112 is transferred onto the paper by the secondary transfer roller 109.

  Above the intermediate transfer belt 112, toner bottles 118 </ b> Y to 118 </ b> K that supply toners of the respective colors to a developing device that includes developing rollers 116 </ b> Y to 116 </ b> K are disposed. The supply of toner from the toner bottles 118Y to 118K to each developing device is performed via a toner transport tube (not shown).

  A fixing unit 119 is disposed at a conveyance destination of a sheet on which a color image is transferred (hereinafter referred to as “transfer sheet”). The fixing unit 119 includes a fixing roller 120 and a pressure roller 121 disposed to face the fixing roller 120. The fixing roller 120 applies heat to the recording surface of the transfer paper, and the pressure roller 121 presses the transfer paper against the fixing roller 120, whereby the color image is fixed on the transfer paper.

  The transfer paper discharged from the fixing unit 119 is discharged onto the paper discharge tray 123 by the discharge roller 122. In the image forming apparatus 100, the paper discharge tray 123 is formed in the internal area of the main unit 102.

  In the image forming apparatus 100, the transfer paper separating mechanism according to the present embodiment is provided above the belt conveying roller 110 and above the fixing roller 120 and the pressure roller 121 of the fixing unit 119, respectively. The transfer paper is prevented from being wound around the fixing roller 120 and the pressure roller 121.

  FIG. 2 is a side view showing a configuration around the transfer paper separating mechanism according to the present embodiment. FIG. 3 is a perspective view showing a configuration around the transfer paper separating mechanism according to the present embodiment. 2 and 3 show the configuration around the transfer paper separating mechanism provided above the belt conveyance roller 110. FIG.

  2 and 3, the separation plate 201 as a transfer paper separation mechanism is in the vicinity of the peripheral surface of the belt conveyance roller 110 and slightly transfers the nip portion between the belt conveyance roller 110 and the secondary transfer roller 109. It is provided at a position on the conveyance direction side of the paper P. As shown in FIG. 2, a part of the separation plate 201 is affixed to a holding portion 202 formed in the housing of the main unit 102. Thereby, a certain positional relationship with the belt conveyance roller 110 is maintained.

  The separation plate 201 is made of a stainless material. Thus, by manufacturing the separation plate 201 with a stainless steel material, the separation plate 201 can be configured with excellent workability, dimensional accuracy, cost, and rigidity.

  FIG. 4 is a side view showing a configuration around the transfer paper separating mechanism according to the present embodiment. FIG. 5 is a perspective view showing a configuration around the transfer paper separating mechanism according to the present embodiment. 4 and 5 show the configuration around the transfer paper separating mechanism provided above the fixing roller 120 and the pressure roller 121 of the fixing unit 119. FIG.

  In FIG. 5, the casing of the fixing unit 119 and an electromagnetic induction heating mechanism described later are omitted. In FIG. 5, the positional relationship between the fixing roller 120 and the pressure roller 121 in FIG. 4 is shown oppositely.

  4 and 5, separation plates 401 and 402 as transfer paper separation mechanisms are in the vicinity of the peripheral surfaces of the fixing roller 120 and the pressure roller 121, respectively, and the nip between the fixing roller 120 and the pressure roller 121. A portion of the transfer paper P is provided at a position slightly on the conveyance direction side. As shown in FIG. 4, a part of the separation plates 401 and 402 is attached to the casing of the fixing unit 119. Thereby, a fixed positional relationship is maintained with the fixing roller 120 and the pressure roller 121, respectively.

  The separation plates 401 and 402 are made of a stainless material. Thus, by manufacturing the separation plates 401 and 402 with a stainless steel material, the separation plates 401 and 402 can be configured to have excellent workability, dimensional accuracy, cost, and rigidity.

  In the fixing unit 119 according to this embodiment, a heating belt 403 is wound around the fixing roller 120 as shown in FIG. On the other hand, the heating belt 403 is wound around the heating roller 404. An electromagnetic induction heating (IH) mechanism 405 is provided so as to cover a peripheral surface of the heating roller 404 and a portion disposed on the opposite side of the fixing roller 120. An eddy current is generated in the heating roller 404 by passing an electric current through the electromagnetic induction coil provided in the IH mechanism 405, and the heating roller 404 is heated. The heat of the heating roller 404 is transmitted through the heating belt 403, and the toner on the transfer paper P is fixed at the nip portion between the fixing roller 120 and the pressure roller 121 by the heat of the heating belt 403.

  In this embodiment, as described above, the toner on the transfer paper P is fixed by the heating belt 404, but the present invention is not limited to this. Of course, a configuration in which the fixing roller 120 itself functions as a heating roller by incorporating a halogen lamp and generating heat by itself may be used.

  Separation plates 201, 401, and 402 as transfer paper separation mechanisms according to the present embodiment are within the width of the transfer paper P in the intermediate transfer belt 112, the fixing roller 120, and the pressure roller 121 as transfer paper holding members, and are transferred. The transfer paper P is brought into contact with the transfer paper P at a position where no image is formed at the end of the paper P, and the transfer paper P is prevented from being wound.

  Hereinafter, the configuration of the separation plates 201, 401, and 402 as the transfer paper separation mechanism according to the present embodiment will be described. In particular, in the following description, the separation plate 401 disposed above the fixing roller 120 will be described as a representative example. The other separation plates 201 and 402 have the same configuration.

(Embodiment 1)
FIG. 6 is a diagram for explaining the configuration of the separation plate 401 as the transfer paper separation mechanism according to the first embodiment of the present invention and the relationship between the separation plate 401 and the transfer paper P.

  As shown in the figure, the separation plate 401 as the transfer paper separation mechanism according to the first embodiment is in sliding contact with the fixing roller 120 only at one location, and maintains a constant distance from the fixing roller 120 at other locations. Thus, the fixing roller 120 is not contacted.

  More specifically, as shown in the figure, the separation plate 401 is provided at one end portion so as to be slightly continuous toward the fixing roller 120 and the sliding contact portion 601. A separation unit 602 is provided, and only the sliding contact portion 601 is in sliding contact with the fixing roller 120.

  The sliding contact portion 601 is in sliding contact with the fixing roller 120 in an area where the image is not formed on the end of the transfer paper P within the width of the transfer paper P in the fixing roller 120 (hereinafter referred to as “non-image forming area”). For example, the sliding contact portion 601 is in sliding contact with the fixing roller 120 at a position corresponding to a blank portion on the transfer paper P where no image is formed.

  The separation unit 602 has a length corresponding to the width of the transfer paper P on the fixing roller 120, and has a constant interval with respect to the fixing roller 120 from one end where the sliding contact portion 601 is provided to the other end. Maintained and arranged.

  In FIG. 6, a case where the transfer paper P conveyed upward is wound around the fixing roller 120 will be described. In this case, when reaching the position of the separation plate 401, the transfer paper P contacts the sliding contact portion 601 of the separation plate 401. Since the sliding contact portion 601 is in sliding contact with the fixing roller 120, the end portion (margin portion) of the transfer paper P rides on the sliding contact portion 601 in accordance with the upward conveyance. When the transfer paper P is further conveyed in this state, the transfer paper P gradually runs on the separation plate 401 from the end on the sliding contact portion 601 side. As a result, the transfer paper P is separated from the fixing roller 120.

  7 and 8 are views for explaining a state in which the transfer paper P is separated by the separation plate 401 as the transfer paper separation mechanism according to the present embodiment. FIG. 7 shows a state immediately after the transfer paper P is separated, and FIG. 8 shows a state where the transfer paper P is completely separated.

  As shown in FIG. 7, the leading edge of the transfer paper P wound around the fixing roller 120 rides on the separation plate 401 and is separated from the fixing roller 120. When conveyed further upward in this state, as shown in FIG. 8, it is completely separated from the fixing roller 120 by the tension of the transfer paper P or a roller disposed above the fixing unit 119, and It is sent out upward.

  As described above, according to the separation plate 401 according to the first embodiment, the sliding contact portion 601 comes into contact with the end portion of the transfer paper P in the fixing roller 120, so that the transfer paper P wound around the fixing roller 120 is removed from the end portion. The transfer paper P can be separated reliably and with high reliability.

  Further, since the sliding contact portion 601 contacts the fixing roller 120 at a position in the non-image forming area on the transfer paper P, the contact with the sliding contact portion 601 also damages the image forming region on the outer peripheral surface of the fixing roller 120. There is no. For this reason, it is possible to reliably avoid a situation in which an image defect occurs on the transfer paper P due to damage generated on the outer peripheral surface of the fixing roller 120.

  In particular, the position where the slidable contact portion 601 contacts the fixing roller 120 is a portion corresponding to a blank area on the transfer paper P. According to this, since the margin area of the transfer paper P can be calculated in advance, the position where the sliding contact portion 601 contacts the fixing roller 120 can be easily determined.

  For example, the margin area where the sliding contact portion 601 contacts may be a margin area when the position reference of the transfer paper P is the one-side reference. In this case, since the one end portion on the position reference side of the transfer paper P is always fixed, there is an effect that the sliding contact portion 601 of the separation plate 401 can be easily aligned. Note that the position reference of the transfer paper P is not limited to the one-side reference, and it goes without saying that the transfer paper separating mechanism of the present embodiment can be applied even when any position reference is adopted.

(Embodiment 2)
Whereas the separation portion 602 of the separation plate 401 according to the first embodiment maintains a certain distance from the fixing roller 120, the separation plate 901 according to the second embodiment has the separation portion 902 on the sliding contact portion 601 side. This is different in that it has a widening interval with respect to the fixing roller 120 from one end to the other end. The separation plate 901 according to the second embodiment is the same as the separation plate 401 according to the first embodiment in that the sliding contact portion 601 alone is in sliding contact with the fixing roller 120.

  FIG. 9 is a diagram for explaining the configuration of the separation plate 901 as the transfer paper separation mechanism according to Embodiment 2 of the present invention and the relationship between the separation plate 901 and the transfer paper P.

  As shown in the figure, the separation plate 901 according to the second embodiment is in sliding contact with the fixing roller 120 only by the sliding contact portion 601. The separation portion 902 has a gap that gradually increases with respect to the fixing roller 120 from one end portion on the sliding contact portion 601 side toward the other end portion. That is, the separation plate 901 has a shape in which the other end is narrower than one end on the sliding contact portion 601 side. When the transfer paper P wound around the fixing roller 120 comes into contact with the separation plate 901, it first comes into contact with the sliding contact portion 601, and then gradually contacts from one end portion on the sliding contact portion 601 side toward the other end portion. .

  As described above, according to the separation plate 901 according to the second embodiment, the separation portion 902 is provided with a widening interval with respect to the fixing roller 120 from one end portion on the sliding contact portion 601 side toward the other end portion. The paper P is gradually separated from one end portion on the sliding contact portion 601 side toward the other end portion where the interval is widened. As a result, as compared with the separation plate 401 according to the first embodiment, the impact when separating the transfer paper P can be reduced and the separation can be performed smoothly.

  For example, when the central portion of the leading end portion of the transfer paper P wound around the fixing roller 120 is raised, the transfer plate P and the separation plate 401 collide with each other in the raised portion of the separation plate 401 according to the first embodiment. Can happen. As a result, the transfer paper P may be bent at the leading end. On the other hand, according to the separation plate 901 according to the second embodiment, the transfer paper P is bent because the transfer paper P in such a state is gradually separated from one end on the sliding contact portion 601 side. It is possible to separate without causing such a situation.

(Embodiment 3)
The separation plate 401 according to the first embodiment maintains a constant interval with respect to the fixing roller 120 on a straight line perpendicular to the traveling direction of the transfer paper P wound around the fixing roller 120, whereas the separation plate 401 according to the third embodiment. The separation plate 1001 is different in that the separation plate 1001 maintains a constant interval with respect to the fixing roller 120 on a straight line inclined by a certain angle toward the traveling direction side of the transfer paper P. Note that the separation plate 1001 according to the third embodiment is the same as the separation plate 401 according to the first embodiment in that the sliding contact portion 601 alone is in sliding contact with the fixing roller 120.

  FIG. 10 is a diagram for explaining the configuration of the separation plate 1001 as the transfer paper separating mechanism according to the third embodiment of the present invention and the relationship between the separation plate 1001 and the transfer paper P.

  As shown in the figure, the separation plate 1001 maintains a constant interval with respect to the fixing roller 120 on a straight line inclined by a predetermined angle toward the traveling direction side of the transfer paper P wound around the fixing roller 120. Therefore, the separation portion 1002 of the separation plate 1001 has a shape along the peripheral surface of the fixing roller 120 corresponding to the inclination, and the other end is longer than the one end on the sliding contact portion 601 side. have.

  As described above, according to the separation plate 1001 according to the third embodiment, the transfer wound around the fixing roller 120 at a constant interval from the one end portion on the sliding contact portion 601 side toward the other end portion with respect to the fixing roller 120. It is provided on a straight line inclined by a certain angle toward the traveling direction side of the paper P. For this reason, since the transfer paper P is gradually separated along the traveling direction, the impact when the transfer paper P is separated can be reduced, and the transfer paper P can be separated smoothly and reliably.

  According to the transfer paper separating mechanism and the image forming apparatus provided with the same according to the present invention, the transfer paper can be reliably and reliably separated without causing an image defect on the transfer paper, and good image formation is achieved. It is useful in that the work can be realized.

1 is a schematic configuration diagram of an image forming apparatus to which a transfer paper separating mechanism according to an embodiment of the present invention is applied. The side view which shows the structure of the periphery of the transfer paper separation mechanism which concerns on the said embodiment. The perspective view which shows the periphery structure of the transfer paper separation mechanism which concerns on the said embodiment. The side view which shows the structure of the periphery of the transfer paper separation mechanism which concerns on the said embodiment. The perspective view which shows the periphery structure of the transfer paper separation mechanism which concerns on the said embodiment. The figure for demonstrating the structure of the transfer paper separation mechanism which concerns on Embodiment 1 of this invention, and the relationship between a transfer paper separation mechanism and transfer paper. The figure for demonstrating the state from which the transfer paper is isolate | separated by the transfer paper separation mechanism which concerns on Embodiment 1. FIG. The figure for demonstrating the state from which the transfer paper is isolate | separated by the transfer paper separation mechanism which concerns on Embodiment 1. FIG. The figure for demonstrating the structure of the transfer paper separation mechanism which concerns on Embodiment 2 of this invention, and the relationship between a transfer paper separation mechanism and transfer paper. The figure for demonstrating the structure of the transfer paper separation mechanism which concerns on Embodiment 3 of this invention, and the relationship between a transfer paper separation mechanism and transfer paper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 112 Intermediate transfer belt 113 Process unit 114 Photosensitive drum 201, 401, 402, 901, 1001 Separation plate 601 Sliding contact part 602, 902, 1002 Separation part

Claims (10)

  A sliding contact portion that slidably contacts the transfer paper holding member at a position corresponding to a region within the width of the transfer paper on the transfer paper holding member and where an image is not formed at the end of the transfer paper, and a continuous connection to the sliding contact portion And a separation unit for separating the transfer paper attached to the transfer paper holding member.   The separation portion has a length corresponding to the width of the transfer paper on the transfer paper holding member, and is constant with respect to the transfer paper holding member from one end where the sliding contact portion is provided to the other end. The transfer paper separating mechanism according to claim 1, wherein the transfer paper separating mechanism is arranged while maintaining an interval of.   The separating portion has a length corresponding to the width of the transfer paper on the transfer paper holding member, and is wide with respect to the transfer paper holding member from one end to the other end where the sliding contact portion is provided. The transfer paper separating mechanism according to claim 1, wherein the transfer paper separating mechanism is arranged with a gap therebetween.   The separation unit has a length corresponding to the paper width of the transfer paper on the transfer paper holding member, and is arranged on a straight line inclined at a certain angle toward the traveling direction side of the transfer paper attached to the transfer paper holding member. 2. The transfer paper separation according to claim 1, wherein the transfer paper separating member is disposed at a constant interval from the one end portion where the sliding contact portion is provided to the other end portion with respect to the transfer paper holding member. mechanism.   2. The sliding contact portion is in sliding contact with the transfer paper holding member at a position within a width of the transfer paper on the transfer paper holding member and corresponding to a blank area in the transfer paper. 4. The transfer paper separating mechanism according to any one of 4 above.   6. The transfer paper separating mechanism according to claim 5, wherein the sliding contact portion is in sliding contact with the transfer paper holding member at a position corresponding to a blank area when the position reference of the transfer paper is a one-side reference.   The transfer paper separating mechanism according to claim 1, wherein the sliding contact portion and the separating portion are made of a stainless material.   The transfer paper separating mechanism according to claim 1, wherein the transfer paper holding member is an intermediate transfer member.   The transfer paper separating mechanism according to claim 1, wherein the transfer paper holding member is a fixing roller or a pressure roller.   An image forming apparatus comprising the transfer paper separating mechanism according to claim 8.

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