JP2012106809A - Paper conveying system and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of a sound followed by paper conveyance in a paper conveying system and an image forming system.SOLUTION: The paper conveying system includes: a first roll for feeding out a sheet of paper toward the downstream side in a conveying direction of the paper; a second roll which is disposed at the downstream side in the conveying direction from the first roll for adjusting feed-out timing to further feed out the conveyed paper toward the downstream side; and a guide member 35_1 which is disposed at a position facing a section course formed between the first roll and the second roll of a paper conveying course in which the paper is conveyed, and has a first guide face 35_1a for guiding the paper which is fed out by the first roll, and conveyed on the section course. The guide member 35_1 has a protrusion 35_1d which protrudes toward the section course in the first guide face 35_1a, and sets an attitude of the paper when tension is applied to the paper by the first roll and the second roll.

Description

  The present invention relates to a sheet conveying device and an image forming apparatus.

  In the image forming apparatus, there is a type of image forming apparatus in which a sheet conveying device is incorporated and an image is formed on a sheet conveyed by the sheet conveying device. A sheet conveying device incorporated in an image forming apparatus of that type is required to suppress a sound generated with the conveyance of the sheet.

  Here, Patent Document 1 includes a guide unit that applies the highest pressing force from the back side of the sheet loop to the center portion in the sheet width direction while guiding the sheet between the pair of auxiliary rolls and the pair of correction rolls. It is disclosed.

JP 2007-131403 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveying apparatus and an image forming apparatus in which sound associated with sheet conveyance is reduced as compared with a case where the structure of the present invention is not provided.

Claim 1
A first roll that feeds the paper toward the downstream side in the conveyance direction of the paper, and a sheet that is arranged downstream of the first roll in the conveyance direction and that has been conveyed further to the downstream side by adjusting the delivery timing. A second roll that is fed out and a section conveying path that is formed between the first roll and the second roll in the paper transport path through which the paper is transported, and is sent out by the first roll. A guide member having a first guide surface for guiding the paper conveyed on the section path,
The paper is characterized in that the guide member has a projection on the first guide surface that protrudes toward the section path and determines the posture of the paper when tension is applied to the paper by the first roll and the second roll. It is a transport device.

  According to a second aspect of the present invention, in the paper conveying device according to the first aspect, the paper conveying device carries a plurality of types of paper having different dimensions in the width direction intersecting with the conveying direction, and the paper for any of the plurality of types of paper is provided. The sheet conveying apparatus is configured to convey the center portions in the width direction so that the protrusions are provided at a center portion in the width direction of the guide member.

  According to a third aspect of the present invention, in the paper conveying apparatus according to the first or second aspect, the protrusions are plate-like protrusions each extending in the conveying direction and arranged in a width direction intersecting the conveying direction. This is a paper transport device.

  According to a fourth aspect of the present invention, in the paper conveying apparatus according to any one of the first to third aspects, the protrusion has a slope that guides the conveyed paper toward the top of the protrusion. This is a paper transport device.

  According to a fifth aspect of the present invention, in the paper conveying apparatus according to any one of the first to fourth aspects, the guide member is sent without passing through the first roll in addition to the first guide surface. A second guide surface that joins the sheet to the section path from the middle and travels toward the second roll, and a sheet guided to the first guide surface and the second guide surface respectively on the first surface and the second surface. And a guide sheet that guides toward two rolls.

  6. The sheet conveying apparatus according to claim 5, wherein the guide sheet is fixed at a position avoiding the protrusion in the width direction intersecting the conveying direction of the first guide surface. This is a paper transport device.

  The paper conveying apparatus according to claim 7, wherein the guide member is a first member that forms a portion of the first guide surface excluding the protrusion and a second guide surface, and A sheet transporting device, wherein a second member forming a protrusion is fixed.

Claim 8 includes an image forming unit that forms an image on a sheet, and a sheet conveying unit that conveys the sheet toward the image forming unit, and the sheet conveying unit includes:
A first roll that feeds the paper toward the downstream side in the conveyance direction of the paper, and a sheet that is arranged downstream of the first roll in the conveyance direction and that has been conveyed is adjusted to the delivery timing and directed toward the image forming unit. The second roll that is fed out and the section that is disposed in a position facing the section path formed between the first roll and the second roll in the sheet transport path through which the sheet is transported and is sent out by the first roll and the section A guide member having a first guide surface for guiding the paper conveyed on the path,
The image is characterized in that the guide member has a projection on the first guide surface that protrudes toward the section path and determines the posture of the paper when tension is applied to the paper by the first roll and the second roll. Forming device.

  According to a ninth aspect of the present invention, in the image forming apparatus according to the eighth aspect, the sheet conveying device carries a plurality of types of sheets having different dimensions in the width direction intersecting the conveying direction, and the plurality of types of sheets are all the sheets The image forming apparatus is characterized in that the sheet conveying device conveys the widthwise center portions of the guide members at the center in the width direction of the guide member.

  A tenth aspect of the present invention is the image forming apparatus according to the eighth or ninth aspect, wherein the protrusions are plate-like protrusions each extending in the transport direction and arranged in a width direction intersecting the transport direction. The image forming apparatus.

  An image forming apparatus according to any one of claims 8 to 10, wherein the protrusion has a slope that guides the conveyed paper toward the top of the protrusion. An image forming apparatus.

  A twelfth aspect of the present invention is the image forming apparatus according to any one of the eighth to eleventh aspects, in which the guide member is sent without passing through the first roll in addition to the first guide surface. Are joined to the section route from the middle and directed to the second roll, and the paper guided to the first guide surface and the second guide surface respectively is second on each of the first surface and the second surface. An image forming apparatus comprising a guide sheet for guiding toward a roll.

  According to a thirteenth aspect of the present invention, in the image forming apparatus according to the twelfth aspect, the guide sheet is fixed at a position avoiding the protrusion in the width direction intersecting the transport direction of the first guide surface. The image forming apparatus.

  A fourteenth aspect of the present invention is the image forming apparatus according to the twelfth or thirteenth aspect, wherein the guide member is a first member that forms a portion of the first guide surface excluding the protruding portion and a second guide surface. An image forming apparatus characterized in that a second member forming a protrusion is fixed.

  According to the sheet conveying device of claim 1 and the image forming apparatus of claim 8, the sound accompanying the conveyance of the sheet is reduced as compared with the case where this configuration is not used.

  According to the paper transport device of claim 2 and the image forming device of claim 9, the sound accompanying the transport of the paper is reduced for any paper having different paper widths.

  According to the paper transport device of claim 3 and the image forming device of claim 10, the paper is smoothly transported with low friction as compared with the case where the protrusion of this configuration is not used.

  According to the paper conveying device of the fourth aspect and the image forming apparatus of the eleventh aspect of the invention, the paper is smoothly guided as compared with the protrusion having no slope.

  According to the paper transport device of the fifth aspect and the image forming apparatus of the twelfth aspect, the transport paths of the paper transported via different paths are merged by one guide member.

  According to the paper conveying device of the sixth aspect and the image forming apparatus of the thirteenth aspect, the protrusion and the guide sheet fixing portion coexist on the first guide surface.

  According to the sheet conveying device of the seventh aspect and the image forming apparatus of the fourteenth aspect, the first member is also used as a guide member that does not require a protrusion.

1 is a schematic configuration diagram of a copying machine as an embodiment of the present invention. FIG. 3 is an enlarged view showing a section route between a transport roll and a standby roll in the paper transport route shown in FIG. 1. FIG. 3 is a perspective view when the section route shown in FIG. 2 is viewed in the arrow XX direction shown in FIG. 2. It is a perspective view of a guide member. It is the perspective view which showed the guide member main body which removed the guide sheet from the guide member shown in FIG. It is the enlarged view which showed one of the projection parts. It is the perspective view which showed the guide member of the 1st modification. It is the schematic diagram which showed the guide member of the 2nd modification in the section of the projection part, and was seen from the side. It is the schematic diagram which showed the guide member of the 3rd modification in the section of the projection part, and was seen from the side.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of a copying machine as an embodiment of the present invention. The copying machine shown in FIG. 1 incorporates an image forming apparatus as an embodiment of the present invention and a paper conveying apparatus as an embodiment of the present invention.

  The copying machine 1 includes a document reading device 10 and an image forming device 20. The document reading apparatus 10 is installed on the image forming apparatus 20 with a frame 30 spaced from the image forming apparatus 20.

  The document reader 10 is provided with a document feeder 11 on which documents S are placed in a stacked state. The documents S placed on the document feeder 11 are sent out one by one, conveyed on the conveying path 13 by the conveying roll 12, and the document reading optical system 15 placed under the document reading plate 14 made of transparent glass. Thus, characters and images recorded on the conveyed document are read and discharged onto the document discharge table 11.

  Further, the document reading apparatus 10 has a hinge extending left and right on the back side, and the document feeding table and the document discharging table 16 can be lifted integrally with the hinge as a rotation center. Under the raised position, the document reading plate 14 spreads.

  In this document reading device 10, instead of placing a document on the document feeder 11, only one document is placed on the document reading plate 14 downward, and the document reading optical system 15 moves in the direction of arrow A. Characters and images can also be read from the original on the manuscript reading plate 14.

  An image signal obtained by the document reading optical system is input to the image forming apparatus 20. The image forming apparatus 20 forms an image based on the input image signal as follows.

  In the lower part of the image forming apparatus 20, four paper feed tables 31_1, 31_2, 31_3, and 31_4 are accommodated. In these paper feed tables 31_1 to 31_4, for example, the sheets P having different dimensions are stored in each paper feed table 31_1 to 31_4. Each of the paper feed tables 31_1 to 31_4 is configured to be freely drawn out for replenishing the paper P.

  Of these four paper feed bases 31_1 to 31_4, for example, from a paper feed base (here, the lowermost paper feed base 31_4) that accommodates paper P having a size suitable for the size of the document. The paper P is fed out by the pick-up roll 32_4, separated one by one by the separating roll 33_4, and the separated single paper P is conveyed upward in the direction of the arrow B by the conveying roll 34_3, and further the guide member 35_3. Guided by the first guide surface 35_2a, further transported by the next transport roller 34_2, guided by the first guide surface 35_2a of the next guide member 35_2, further transported by the next transport roller 34_1, and the first guide surface 35_1. The leading end of the sheet P is guided by the one guide surface 35_1a and reaches the standby roll 36. The standby roll 36 plays a role of adjusting the timing of the subsequent conveyance and sending out the paper. The paper that has reached the standby roll 36 is adjusted by the standby roll 36 for the subsequent conveyance timing. Is further conveyed. The conveyance after the standby roll 36 will be described later.

  When the paper P is sent out from the second paper supply base 31_3 from the bottom, the paper P stored in the paper supply base 31_3 is sent out by the pick-up roll 32_3 and separated one by one by the separating roll 33_3, The separated sheet P is guided by the second guide surface 35_3b of the guide member 35_3, is transported by the transport roll 34_2, is guided by the first guide surface 35_2a of the guide member 35_2, and is transported by the next transport roll 34_1. It is conveyed, guided by the first guide surface 35_1a of the guide member 35_1, and reaches the standby roll 36.

  Similarly, from the third paper supply base 31_2 from the bottom, the paper P accommodated in the paper supply base 31_2 is sent out by the pick-up roll 32_2 and separated one by one by the separation roll 33_2, and the separation is performed. The one sheet P thus guided is guided by the second guide surface 35_2b of the guide member 35_2, is advanced by the transport roll 34_1, and is guided by the first guide surface 35_1a of the guide member 35_1 to reach the standby roll 36.

  From the uppermost paper feed table 31_1, the paper P accommodated in the paper feed table 31_1 is sent out by the pickup roll 32_1, separated one by one by the separation roll 33_1, and the separated one sheet P is guided by the second guide surface 35_1b of the guide member 35_1 and reaches the standby roll 36.

  Here, the sheet conveyance path between the uppermost conveyance roll 34_1 and the standby roll 36 of the three sets of conveyance rolls 34_1, 34_2, and 34_3 described so far has a sheet conveyance path bent in an arc shape. The guide member 35_1 is disposed inside the arc.

  Here, in the present embodiment, the uppermost transport roll 34_1 is an example of the first roll referred to in the present invention, the standby roll is an example of the second roll referred to in the present invention, and the guide member 35_1 is included in the present invention. It is an example of a guide member. The detailed structure of this part will be described later.

  The image forming apparatus 20 is provided with a manual paper feed tray 37. It is also possible to place paper on the manual paper feed tray 37 and feed the paper placed on the manual paper feed tray 37 in accordance with the arrow C.

  In addition, the image forming apparatus 20 includes a photosensitive member 21 that rotates in the direction indicated by an arrow D above the standby roll 36, and around the photosensitive member 21, a charger 22, an exposure device 23, and a developing device 24. A transfer device 25 and a cleaner 26 are provided.

  The photosensitive member 21 has a cylindrical shape, holds charges by charging, and discharges the charges by exposure, so that an electrostatic latent image is formed on the surface.

  The charger 22 charges the surface of the photoreceptor 21 to a certain charging potential.

  Further, the image signal obtained by the document reading apparatus 10 as described above is input to the exposure device 23, and the exposure light 231 modulated according to the image signal is output from the exposure device 23. The photoreceptor 21 is exposed to the exposure light 231, and an electrostatic latent image is formed on the surface of the photoreceptor 21.

  Further, the photosensitive member 21 is exposed by the exposure light 231 to form an electrostatic latent image on the surface, and then developed by the developing device 24, so that a toner image is formed on the surface of the photosensitive member 21. The toner image formed on the surface of the photoconductor 21 is subjected to the action of the transfer device 26 so that the toner image on the photoconductor 21 reaches the position in accordance with the timing when the toner image reaches the position facing the transfer device 26. The image is transferred onto the sheet fed by the standby roll 36.

  The sheet that has received the transfer of the toner image further proceeds in the direction of arrow E, and is heated and pressed by the fixing device 27 to form an image composed of the fixed toner image on the sheet. The paper that has passed through the fixing device 27 is further fed in the direction of arrow F by the paper discharge roll 28 and discharged onto the paper discharge table 29.

  The toner remaining on the photoconductor 21 after the transfer of the toner image is removed from the photoconductor 21 by the cleaner 26.

  The image forming apparatus 20 is an apparatus capable of forming images on both sides of the paper P. When images are formed on both sides of the sheet P, the sheet P on which the image is formed only on the first side of the sheet P as described above has the trailing edge of the sheet in the direction of arrow F by the discharge roll 28. The sheet is fed onto the sheet discharge table 29 until it is sandwiched between the sheet discharge rolls 28. Thereafter, the rotation direction of the paper discharge roll 28 is reversed, and the paper P is pulled in the direction of the arrow G. The drawn paper advances in the direction of arrow H, and is further conveyed in the directions of arrows I and J by the conveyance roll 38 and reaches the standby roll 36 again. Thereafter, an image is formed on the second surface of the paper P in the same manner as the image formation on the first surface. The paper P on which images are formed on both sides in this manner is then discharged onto the paper discharge tray 29.

  FIG. 2 is an enlarged view showing a section path between the transport roll 34_1 and the standby roll 36 in the paper transport path shown in FIG. Here, the paper transport path between the transport roll 34_1 and the standby roll 36 is referred to as a “section path” in order to distinguish it from the entire paper transport path. As shown in FIG. 2, the section path 50 is bent in an arc shape, and the guide member 35_1 is disposed at the center of the section path 50 and on the inner side facing the section path 50. Yes. The guide member 35_1 faces the section path 50 and guides the first guide surface 35_1a for guiding the paper sent out by the transport roll 34_1 and the paper sent out from the uppermost paper feed table 31_1. The second guide surface 35 </ b> _ <b> 1 b is joined to the section route 50 from the middle and directed toward the standby roll 36. The guide member 35_1 further includes a guide sheet 35_1c that expands toward the standby roll 36 side. The guide sheet 35_1c is a flexible sheet made of, for example, a PET sheet or the like, and the sheets guided respectively to the first guide surface 35_1a and the second guide surface 35_1b are transferred to the first guide surface of the guide member 35_1. The first surface on the 35_1a side and the second surface on the second guide surface 35_1b side are each guided toward the standby roll 36. Here, the reason why the guide sheet 35_1c is used is that even if it is a narrow gap, it is possible to enter and guide the paper, and the paper guided to the second guide surface 35_1b is jammed. This is because it is easy to remove the paper with the paper jam using the flexibility of the guide sheet 35_1c.

  Here, on the first guide surface 35_1a of the guide member 35_1, a projection 35_1d protruding toward the section path 50 is formed at a portion near the upper end thereof.

  The sheet conveyed by the conveyance roll 34_1 is further pressed by the conveyance roll 34_1 after the leading edge of the sheet reaches the standby roll 36, and stops in a state of being bent in the section path 50. The reason for stopping the sheet in a bent state is to correct the posture of the sheet by pressing the sheet against the standby roll 36. Thereafter, as described above, the timing of the sheet is adjusted by the standby roll 36, and the paper is sent further downstream from the standby roll 36.

  The protrusion 35_1d provided on the first guide surface 35_1a acts upon the feeding, and the sound generated at the time of the feeding when the protrusion 35_1d is not present is suppressed.

  In the standby state where the sheet stops in the section path 50 and is waiting to be sent out by the standby roll 36, it is bent as described above. After that, when the standby roll 36 starts rotating and the leading end of the sheet is sent out by the standby roll 36, the transport roll 34_1 and the standby roll 36 apply tension to the section in the section path 50 of the sheet, and the section path. The sheet is pressed against the protrusion 35_1d so as to be the shortest distance within 50. That is, the protrusion 35_1d protrudes toward the section path 50 to a position that determines the posture of the sheet when tension is applied to the sheet by the transport roll 34_1 and the standby roll 36. When conveyance of the sheet by the standby roll 36 is started, the sheet hits the projection 35_1d, vibration is suppressed at the portion of the sheet that hits the projection 35_1d, and the remaining vibration energy is conveyed more than the projection 35_1d. Dispersed on the roll 34_1 side and on the standby roll 36 side with respect to the protrusion 35_1d. As a result, it is considered that annoying sounds can be suppressed.

  As described above, in the case of the copying machine 1 described here (see FIG. 1), the projection 35_1d provided on the guide member 35_1 suppresses the generation of sound accompanying the conveyance of the sheet.

  3 is a perspective view when the section route shown in FIG. 2 is viewed in the direction of arrow XX shown in FIG.

  FIG. 3 shows a guide member 35_1, a sheet metal member 51 provided below the guide member 35_1, and a standby roll 36 provided above the guide member 35_1. The standby roll 36 shown in FIG. 4 is one of the pair of standby rolls 36 shown in FIG.

  FIG. 3 shows a first guide surface 35_1a of the guide member 35_1, a protrusion 35_1d provided on the first guide surface 35_1a, and a guide sheet 35_1c.

  4 is a perspective view of the guide member, and FIG. 5 is a perspective view showing the guide member body from which the guide sheet is removed from the guide member shown in FIG.

  As shown in FIGS. 3 to 5, the first guide surface 35 </ b> _ <b> 1 a of the guide member 35 </ b> _ <b> 1 is provided with a plurality of protrusions 35 </ b> _ <b> 1 d arranged in the width direction (arrow Y-Y direction shown in FIG. 4).

  FIG. 6 is an enlarged view showing one of the protrusions.

  The protrusion 35_1d is a plate-like protrusion extending in the paper conveyance direction, and has a slope 35_1f that guides the conveyed paper toward the top 35_1e of the protrusion.

  Due to the presence of the inclined surface 35_1f, the conveyed paper smoothly runs on the projection 35_1d, and also in this respect, the generation of sound accompanying the paper conveyance is suppressed. Further, in this embodiment, since a plurality of plate-like structures arranged in the width direction of the protrusions are employed, the friction accompanying the sheet conveyance between the sheet and the protrusions is suppressed, and this point is also smooth. Sheet conveyance is performed, and the generation of sound accompanying sheet conveyance is suppressed.

  Here, as shown in FIGS. 3 to 5, the protrusions 35 </ b> _ <b> 1 d as a whole are provided at the center in the width direction. In the image forming apparatus 20 (see FIG. 1), when a plurality of types of sheets having different dimensions in the width direction are accommodated in the sheet feeding bases 31_1 to 31_4, the sheet of any of the plurality of types of sheets having different dimensions is stored. It is configured to transport the center portions in the width direction so that they are aligned with each other.

  Therefore, the protrusion 35_1d acts on both wide paper and narrow paper. That is, the generation of sound accompanying the sheet conveyance can be suppressed for any sheet having different width dimensions.

  Further, the guide sheet 35_1c has a width of the first guide surface 35_1a that is the same as the surface on which the protruding portion 35_1d is provided on one side of the lower end side thereof, that is, one side closer to the transport roll 34_1 (see FIGS. 1 and 2). It is affixed at a position avoiding the protrusion 35_1d in the direction (arrow YY direction in FIG. 4). In the case of the embodiment shown here, the protrusion 35_1d is provided at the center in the width direction as a whole, and thus both sides thereof are used as glue margins for attaching the guide sheet 35_1c.

  FIG. 1 shows three guide members 35_1, 35_2, and 35_3. Here, the uppermost guide member 35_1 of the three guide members 35_1 to 35_3 has been described, but the other two guide members are illustrated. 35_2 and 35_3 are the same as the uppermost guide member 35_1 except that the protrusion 35_1d and the guide sheet 35_1c are not present and the first guide surfaces 35_2a and 35_3b are slightly wider than the uppermost guide member 35_1. It has almost the same shape.

  This is the end of the description of the present embodiment. Next, several modifications will be described.

  FIG. 7 is a perspective view showing a guide member of a first modification.

  Here, for ease of understanding, even if there is a difference in shape, the same reference numerals as those used in the above-described embodiment are used.

  FIG. 7 shows the upper two guide members 35_1 and 35_2 of the three guide members 35_1, 35_2, and 35_3 shown in FIG.

  Of the two guide members 35_1 and 35_2, the upper guide member 35_1 is provided with a protrusion 35_1d and a guide sheet 35_1c.

  Unlike the plate-like protrusion (see FIGS. 3 to 6) in the above-described embodiment, the protrusion 35_1d in the modification shown in FIG. 7 is a protrusion that extends long in the width direction. The protrusion 35_1d is formed at a position excluding the central portion in the width direction and both end portions, and the central portion and both end portions are used as adhesive margins for attaching the guide sheet 35_1c.

  As shown in FIG. 7, the protrusion 35_1d does not necessarily have a plate shape, and may extend long in the width direction. Further, the projection 35_1d may extend to both ends as well as the center.

  The lower guide member 35_2 shown in FIG. 7 has substantially the same shape as the upper guide member 35_1 except that there are no protrusions and guide sheets and the first guide surface 35_2a is slightly wider. Of the three guide members 35_1, 35_2, and 35_3 shown in FIG. 1, the lowermost guide member 35_3 has the same shape as the guide member 35_2 immediately above it.

  FIG. 8 is a schematic view showing the guide member of the second modified example taken along the section of the protrusion and viewed from the side.

  In FIG. 8 as well, the same reference numerals as those used in the above-described embodiment are attached, regardless of the difference in shape.

  The guide member 35_1 of the second modified example shown in FIG. 8 includes a first member 35_1g and a first member 35_1g that form a portion of the first guide surface 35_1a excluding the protrusion 35_1d and the second guide surface 35_1b. The second member 35_1h forming the projection 35_1d, which is another member, is fixed by adhesion.

  As described above, when the protrusion 35_1d is configured by the second member 35_1h as a separate member and the second member 35_1h is fixed to the first member 35_1g, the protrusion 35_1d and the guide sheet 35_1c are required. The same first member 35_1g can be used for the guide members 35_1 (see FIG. 1) and the guide members 35_2 and 35_3 that do not require the protrusions 35_1d and the guide sheet 35_1c.

  FIG. 9 is a schematic view showing the guide member of the third modified example as seen from the side by cross-section at the protruding portion.

  The guide member 35_1 in FIG. 9 also includes a first member 35_1g and a second member 35_1h. The second member 35_1h is attached to the first member 35_1g from above the guide sheet 35_1c with the guide sheet 35_1c attached to the first member 35_1g interposed therebetween.

  In the case of the guide member having the structure shown in FIG. 9, as in the guide member of FIG. 8, the same first member 35_1g is used for both the guide member that requires the projection 35_1d and the guide sheet 35_1c and the guide member that does not require them. Can be used.

  Here, the example in which the present invention is applied to the image forming apparatus 10 constituting the copying machine 1 having the structure shown in FIG. 1 has been described, but the present invention is not limited to the image forming apparatus 10 having the structure shown in FIG. Any type of image forming apparatus that conveys paper can be applied. The present invention is not only applied to the image forming apparatus, but can be widely applied to any apparatus that transports paper.

DESCRIPTION OF SYMBOLS 1 Copier 10 Original reading apparatus 20 Image forming apparatus 30 Frame 31_1, 31_2, 31_3, 31_4 Paper feed tray 32_1, 32_2, 32_3, 32_4 Pickup roll 33_1, 33_2 Separation roll 34_1, 34_2, 34_3 Conveyance roll 35_1, 35_2, 35_3 Guide Member 35_1a, 35_2a, 35_3a First guide surface 35_1b, 35_2b, 35_3b Second guide surface 35_1c Guide sheet 35_1d Projection 35_1e Top 35_1f Slope 35_1g First member 35_1h Second member 36 Path

Claims (14)

A first roll for feeding the paper toward the downstream side in the conveyance direction of the paper;
A second roll that is arranged downstream of the first roll in the transport direction and transports the paper that has been transported, and feeds the paper further downstream by adjusting the feed timing;
Of the paper conveyance path through which the paper is conveyed, the sheet is arranged at a position facing the section path formed between the first roll and the second roll, and is sent out by the first roll and transported on the section path. A guide member having a first guide surface for guiding the sheet to be printed,
The guide member has a protrusion on the first guide surface that protrudes toward the section path and determines a posture of the paper when a tension is applied to the paper by the first roll and the second roll. A paper conveying device characterized by the above. The sheet conveying apparatus is configured to convey a plurality of types of sheets having different dimensions in the width direction intersecting the conveying direction, and conveys the plurality of types of sheets with the width direction center portions of the sheets aligned with each other. A device,
The sheet conveying device according to claim 1, wherein the protrusion is provided at a center portion in the width direction of the guide member.   3. The paper conveying apparatus according to claim 1, wherein the protrusions are plate-like protrusions each extending in the conveying direction and arranged in a width direction intersecting the conveying direction.   4. The sheet conveying device according to claim 1, wherein the protrusion has a slope that guides the conveyed sheet toward the top of the protrusion. 5. In addition to the first guide surface, the guide member further includes:
A second guide surface that joins the paper sent without going through the first roll to the section path from the middle and directs it toward the second roll;
2. A guide sheet for guiding sheets guided respectively to the first guide surface and the second guide surface toward the second roll on the first surface and the second surface, respectively. 5. The sheet conveying device according to claim 1.   6. The paper conveying apparatus according to claim 5, wherein the guide sheet is fixed at a position avoiding the protrusion in the width direction of the first guide surface that intersects the conveying direction.   In the guide member, a second member forming the protrusion is fixed to a first member forming the portion of the first guide surface excluding the protrusion and the second guide surface. The sheet conveying device according to claim 5 or 6, An image forming unit for forming an image on paper;
A sheet conveying unit that conveys the sheet toward the image forming unit,
The paper transport unit is
A first roll for feeding the paper toward the downstream side in the conveyance direction of the paper;
A second roll that is arranged downstream of the first roll in the carrying direction and that has been fed, and that feeds the paper toward the image forming unit with a feeding timing adjusted;
Of the paper conveyance path through which the paper is conveyed, the sheet is arranged at a position facing the section path formed between the first roll and the second roll, and is sent out by the first roll and transported on the section path. A guide member having a first guide surface for guiding the sheet to be printed,
The guide member has a protrusion on the first guide surface that protrudes toward the section path and determines a posture of the paper when a tension is applied to the paper by the first roll and the second roll. An image forming apparatus. The paper transport unit is responsible for transporting a plurality of types of papers having different widthwise dimensions that intersect the transport direction, and transports all of the plurality of types of papers with the center portions in the width direction aligned with each other. Part,
The image forming apparatus according to claim 8, wherein the protrusion is provided at a central portion in the width direction of the guide member.   10. The image forming apparatus according to claim 8, wherein the protrusions are plate-like protrusions each extending in the transport direction and arranged in a width direction intersecting the transport direction.   11. The image forming apparatus according to claim 8, wherein the protrusion has a slope that guides the conveyed paper toward the top of the protrusion. 11. In addition to the first guide surface, the guide member further includes:
A second guide surface that joins the paper sent without going through the first roll to the section path from the middle and directs it toward the second roll;
9. A guide sheet for guiding sheets guided respectively to the first guide surface and the second guide surface toward the second roll on the first surface and the second surface respectively. The image forming apparatus according to claim 1.   13. The image forming apparatus according to claim 12, wherein the guide sheet is fixed at a position avoiding the protrusion in the width direction of the first guide surface that intersects the transport direction.   In the guide member, a second member forming the protrusion is fixed to a first member forming the portion of the first guide surface excluding the protrusion and the second guide surface. The image forming apparatus according to claim 12, wherein the image forming apparatus is an image forming apparatus.

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