JP6958167B2 - Image forming device - Google Patents

Description

The present invention relates to an image forming apparatus capable of forming an image on both sides of a sheet.

Conventionally, an image forming apparatus capable of forming an image on both sides of a sheet such as printing paper has been known.

In this type of image forming apparatus, there is a configuration in which a reconveying unit is provided detachably from the apparatus main body in which the image forming portion is housed. The reconveying unit is provided with a drive roller and a pinch roller that rotates in response to the drive roller. A gear is supported at the end of the shaft of the drive roller so as not to rotate relative to each other. When the re-conveying unit is mounted on the main body of the device, the gear provided on the main body of the device meshes with the gear of the re-conveying unit, and the driving force is transmitted from the gear of the main body of the device to the gear of the re-conveying unit.

When an image is formed on both sides of the sheet, the sheet is introduced into the reconveying unit after the image is formed on one side of the sheet by the image forming portion. Further, a driving force is transmitted from the gear of the apparatus main body to the gear of the reconveying unit, the driving roller rotates by the driving force, and the pinch roller rotates in accordance with the driving roller. The sheet introduced into the re-conveying unit is sandwiched between the drive roller and the pinch roller, receives a conveying force from the driving roller and the pinch roller, and is conveyed in the re-conveying unit. After the sheet is conveyed to the reconveying unit, the sheet is fed to the image forming unit in a state in which the front and back sides of the sheet are reversed when the image is formed on one surface. Then, the image forming portion forms an image on the other surface of the sheet.

Japanese Unexamined Patent Publication No. 2012-208320

In the configuration disclosed in Patent Document 1, the gear of the reconveying unit is supported at the end of the shaft. The shaft that supports the gear is provided in a cantilever state with the end on the gear side as the free end by supporting the end on the side opposite to the gear side by the reconveying unit. Therefore, when an unexpectedly large driving force is applied to the gear of the reconveying unit, the position of the gear shifts in the direction intersecting the rotation axis, and the gear of the main body of the device and the gear of the reconveying unit are disengaged, resulting in the device. The driving force transmission path from the main body to the reconveying unit may be blocked.

An object of the present invention is to provide an image forming apparatus capable of satisfactorily maintaining a driving force transmission path from an apparatus main body to a reconveying unit.

In order to achieve the above object, the image forming apparatus according to the present invention includes an apparatus main body and a reconveying unit detachably provided on the apparatus main body, and the apparatus main body forms an image forming an image on a sheet. A first gear portion rotatably provided around a rotation axis extending in a predetermined direction and to transmit a driving force from a drive source, and a first tooth portion having teeth meshing with the first gear formed on the outer periphery thereof. , And a hollow first pin holding portion extending to one side in the predetermined direction, and slidably provided between the drive position and the non-drive position on the other side in the predetermined direction from the drive position. A second gear, a first support portion that rotatably supports the second gear on the other side in the predetermined direction from the first pin holding portion, and the predetermined direction from the first support portion. A second support portion that rotatably supports the second gear on one side and one end portion are arranged in the first pin holding portion and held by the first pin holding portion, and the first pin holding portion is used as described. The reconveying unit includes a rotational force transmission pin projecting to the one side in a predetermined direction and a regulating member for restricting the movement of the second gear from the drive position to the other side in the predetermined direction. A unit having a configuration in which a sheet having an image formed on one surface by the forming portion is re-conveyed to the image forming portion, and extends to the second tooth portion having teeth formed on the outer periphery and the other side in the predetermined direction. A third gear having a hollow second pin holding portion is provided, and the rotational force transmission pin is formed with a first protrusion protruding in the rotational radial direction of the rotational force transmission pin at one end thereof. A second protrusion protruding in the rotational radial direction is formed at the other end, and a ridge extending in the predetermined direction is formed on the inner surface of the first pin holding portion, and the first protrusion and the rotational force are formed. A first ridge portion that abuts in the rotation direction of the transmission pin is formed, and a ridge extending in the predetermined direction is formed on the inner surface of the second pin holding portion, and abuts on the second protrusion portion in the rotation direction. A second ridge portion is formed, and the second pin holding portion is opened to the other side in the predetermined direction, and when the second gear is positioned at the driving position, the rotational force transmission pin The other end is accommodated, and the other end of the rotational force transmission pin can be detached when at least the second gear is located at the non-driving position.

According to this configuration, in the main body of the apparatus, the driving force is transmitted from the first gear to the second gear by meshing the first gear and the first tooth portion of the second gear. The second gear has a first pin holding portion that extends to one side in a predetermined direction. The first pin holding portion holds one end of the rotational force transmission pin. Further, the second gear is slidably provided between the drive position and the non-drive position on the other side in a predetermined direction from the drive position.

On the other hand, the reconveying unit detachably provided on the main body of the apparatus is provided with a third gear having a second pin holding portion. The second pin holding portion is open to the other side in a predetermined direction, and when the second gear is located at the drive position, the other end portion of the rotational force transmission pin is accommodated. At least when the second gear is located in the non-driving position, the other end of the rotational force transmission pin can be separated from the second pin holding portion. The reconveying unit can be removed from the main body of the apparatus by separating the other end of the rotational force transmission pin from the second pin holding portion. Therefore, the re-transport unit can be replaced with a new one with a simple configuration.

A first protrusion and a second protrusion are formed on one end and the other end of the rotational force transmission pin, respectively. Correspondingly, the first pin holding portion is formed with a first protrusion portion that contacts the first protrusion portion and the rotational force transmission pin in the rotational direction, and the second pin holding portion is formed with a second protrusion portion. A second ridge portion that comes into contact with the rotational force transmission pin in the rotational direction is formed. Therefore, the movement of the second gear is restricted by the regulating member at the drive position, and one end and the other end of the rotational force transmission pin are housed in the first pin holding portion and the second pin holding portion, respectively. When the two gears rotate, a rotational force is input from the first protrusion of the first pin holding portion to the first protrusion of the rotational force transmission pin, the rotational force transmission pin rotates, and the second of the rotational force transmission pin A rotational force is transmitted from the protrusion to the second ridge, and the third gear rotates. As a result, the transmission of the driving force, which is the rotational force, from the apparatus main body to the reconveying unit is achieved.

The other side of the second gear in a predetermined direction is supported by the first support portion, and one side is supported by the second support portion. Therefore, even if a large driving force is input to the second gear, the position of the second gear can be changed. It is possible to suppress the deviation in the direction intersecting the rotation axis of the second gear, and it is possible to prevent the other end of the rotational force transmission pin from coming off from the second pin holding portion. As a result, the driving force transmission path from the apparatus main body to the reconveying unit can be maintained satisfactorily.

Further, since the second gear and the third gear are connected by the rotational force transmission pin, even if the center of the second gear and the center of the third gear are not aligned in a straight line, the misalignment is allowed. Therefore, the rotational force of the second gear can be transmitted to the third gear via the rotational force transmission pin.

According to the present invention, it is possible to maintain a good driving force transmission path from the apparatus main body to the reconveying unit.

It is sectional drawing of the color laser printer which concerns on one Embodiment of this invention. It is the bottom view of the color laser printer, and shows the state which the lid is attached to the apparatus main body. It is a bottom view of a color laser printer, and a part shown in FIG. 2 is enlarged and shown. It is a top view of the re-conveyance unit. It is a left side view of a re-conveyance unit. It is a perspective view of the lower guide of a re-conveying unit. It is sectional drawing which shows the structure of the drive connection part, and shows the state which the driven gear is located in the non-drive position. It is sectional drawing which shows the structure of the drive connection part, and shows the state which the driven gear is located at the drive position. It is sectional drawing which shows the structure of the drive connection part, and shows the state which the driven gear is located between the drive position and the non-drive position. It is a perspective view of the bearing member provided in the drive connection part. It is a perspective view of the rotational force transmission pin provided in the drive connection part. It is a perspective view of a lid.

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

<Overall configuration>
As an example of the image forming apparatus, FIG. 1 shows a color laser printer 1. However, the image forming apparatus may be a monochrome laser printer or an inkjet printer that forms an image on a sheet S such as printing paper by an inkjet method.

The color laser printer 1 includes an apparatus main body 11.

A paper feed tray 12 is mounted on the bottom of the apparatus main body 11. The paper feed tray 12 is provided so as to be able to be pulled out from the bottom of the apparatus main body 11 to one side. The paper feed tray 12 is configured to be capable of accommodating a plurality of sheets S such as printing paper in a stacked state.

For use in the following description, the drawer side (left side in FIG. 1) of the paper feed tray 12 from the apparatus main body 11 is defined as the “front side”, and the opposite side is defined as the “rear side”. Then, the left and right sides are defined based on the state in which the color laser printer 1 is viewed from the "front side".

On the upper surface of the apparatus main body 11, a recess having a bottom surface that sinks downward toward the rear side is formed as a paper output tray 13. The output tray 13 can support a plurality of sheets S in a stacked state.

An image forming portion 14 for forming an image on the sheet S is provided in the apparatus main body 11. The image forming unit 14 includes four sets of process units 21, an exposure device 22, and a fixing device 23.

The four sets of process units 21 are provided for each color of black (K), yellow (Y), magenta (M), and cyan (C), and are black, yellow, and black, yellow, from the front side at the upper position of the paper feed tray 12. Magenta and cyan are arranged in parallel at equal intervals in the front-back direction. Each process unit 21 includes a photoconductor drum 24, a charger 25, a developing device 26, and a transfer roller 27. The photoconductor drum 24 is provided so as to be rotatable about a rotation axis extending in the left-right direction. The charger 25, the developing device 26, and the transfer roller 27 are arranged around the photoconductor drum 24 in that order in the rotation direction of the photoconductor drum 24.

The exposure device 22 is arranged above the four sets of process units 21. The exposure device 22 includes an optical system such as a laser and a polygon mirror, and emits a laser beam based on image data toward the peripheral surface of each photoconductor drum 24.

The fuser 23 is arranged further behind the rearmost photoconductor drum 24. The fuser 23 includes a heat roller 28 and a pressure roller 29. The thermal roller 28 is rotatably provided about an axis extending in the left-right direction. The pressure roller 29 is rotatably provided around an axis extending in the left-right direction, and its peripheral surface is in contact with the peripheral surface of the thermal roller 28 from the rear lower side.

Further, in the apparatus main body 11, a substantially S-shaped transport path 31 for left side view is formed from above the front end portion of the paper feed tray 12 to the rear end of the output tray 13 via the image forming portion 14. There is.

In order to transport the sheet S along the transport path 31, the paper feed roller 32, the separation roller 33, the separation pad 34, the transport belt 35, the first transport roller 36, the second transport roller 37, and the discharge roller 37 are contained in the apparatus main body 11. A paper roller 38 or the like is provided.

The paper feed roller 32 is arranged above the front end portion of the paper feed tray 12 and is rotatably provided about a rotation axis extending in the left-right direction. The uppermost sheet S supported by the paper feed tray 12 comes into contact with the peripheral surface of the paper feed roller 32 from below.

The separation roller 33 and the separation pad 34 are arranged at positions in front of and above the paper feed roller 32. The separation roller 33 is rotatably provided about a rotation axis extending in the left-right direction. The separation pad 34 is in contact with the peripheral surface of the separation roller 33 from the front lower side. Instead of the separation pad 34, a retard roller that rotates, stops, or rotates in the direction opposite to the separation roller 33 in the same direction as the separation roller 33 at a lower speed than the separation roller 33 may be adopted.

The transport belt 35 is arranged below the four photoconductor drums 24. The transport belt 35 is an endless belt wound around two rollers 41 and 42. The two rollers 41 and 42 are arranged at the same position in the vertical direction and are arranged at intervals in the front-rear direction. As a result, the transport belt 35 has vertically extending planar portions in the front-rear direction and the left-right direction between the two rollers 41 and 42. The upper flat portion extends between the four photoconductor drums 24 and the four transfer rollers 27 and is in contact with the peripheral surfaces of the photoconductor drums 24 and the transfer rollers 27.

The first transport roller 36, the second transport roller 37, and the paper ejection roller 38 are all driven by a drive roller rotatably provided about an axis extending in the left-right direction and a peripheral surface of the drive roller that comes into contact with the peripheral surface of the drive roller. It forms a nip with a roller and consists of a pair with a driven roller that rotates as the drive roller rotates.

The first transport roller 36 is arranged on the upstream side of the transport belt 35 in the transport direction of the sheet S in the transport path 31 (hereinafter, simply referred to as “convey direction”).

The second transfer roller 37 is arranged on the downstream side in the transfer direction with respect to the fuser 23.

The paper ejection roller 38 is located on the downstream side of the second conveying roller 37 in the conveying direction and at a position behind the paper ejection tray 13.

When an image is formed (printed) on the sheet S, one sheet S is fed from the paper feed tray 12, and the sheet S is conveyed along the transfer path 31. An image is formed on the sheet S while the sheet S passes through the image forming unit 14 while being conveyed along the conveying path 31 and the sheet S passes through the image forming unit 14. The image-formed sheet S is discharged onto the paper output tray 13 after passing through the image forming unit 14.

Specifically, the paper feed roller 32 is rotated to feed the sheet S from the paper feed tray 12. Due to the rotation of the paper feed roller 32, the sheet S in contact with the peripheral surface of the paper feed roller 32 is sent out to the mounting side. The sheets S sent out from the paper feed tray 12 are separated one by one by passing between the separation roller 33 and the separation pad 34.

The sheet S that has passed between the separation roller 33 and the separation pad 34 is conveyed by the first transfer roller 36 toward the image forming unit 14 by the transfer path 31, and is fed onto the transfer belt 35. The sheet S fed onto the transport belt 35 moves integrally with the flat portion on the upper side of the transport belt 35, and passes between each photoconductor drum 24 and the transport belt 35 in order.

The photoconductor drum 24 is rotated counterclockwise when viewed from the right side. As the photoconductor drum 24 rotates, the surface of the photoconductor drum 24 is uniformly charged by the discharge from the charger 25 and then selectively exposed by the laser beam from the exposure device 22. By this exposure, electric charges are selectively removed from the surface of the photoconductor drum 24, and an electrostatic latent image is formed on the surface of the photoconductor drum 24. When the electrostatic latent image faces the developer 26, toner is supplied from the developer 26 to the electrostatic latent image. As a result, the electrostatic latent image on the surface of the photoconductor drum 24 is developed into a toner image.

A transfer bias is supplied to the transfer roller 27. When a monochrome image is formed on the sheet S, a toner image is formed on the surface of the black photoconductor drum 24. Then, the black toner image is transferred to the sheet S passing between the photoconductor drum 24 and the transport belt 35 by the action of the transfer bias. Further, when a color image is formed on the sheet S, a toner image is formed on the surfaces of two or more photoconductor drums 24. Then, those toner images are transferred by superimposing each other on the sheet S passing between the photoconductor drum 24 and the transport belt 35 due to the action of the transfer bias.

The sheet S to which the toner image is transferred in this way is conveyed to the fixing device 23. In the fuser 23, the sheet S passes between the thermal roller 28 and the compression roller 29. At that time, the toner image is fixed to the sheet S by heating and pressurizing. As a result, an image is formed on one surface of the sheet S.

In the color laser printer 1, single-sided printing in which an image is formed on only one side of the sheet S and double-sided printing in which an image is formed on both one side and the other side of the sheet S can be performed.

At the time of single-sided printing, the sheet S having an image formed on one side is conveyed by the second conveying roller 37 toward the paper ejection roller 38, and is ejected onto the paper ejection tray 13 by the paper ejection roller 38. Will be done.

For double-sided printing, the color laser printer 1 is provided with a reconveying unit 51 that can be attached to and detached from the apparatus main body 11. Then, in the state where the re-transport unit 51 is mounted on the apparatus main body 11, the re-transport path 52 via the re-transport unit 51 is formed.

The re-transport path 52 is separated from the transfer path 31 between the fuser 23 and the second transfer roller 37, extends downward at the rear end portion in the apparatus main body 11, and is arranged below the paper feed tray 12. It curves forward at the position on the rear side of the re-conveying unit 51, extends inside the re-conveying unit 51 to the front side, and curves upward at the position on the front side of the re-conveying unit 51, and the separation roller 33 and the first transport. It is connected to the transport path 31 with the roller 36. The re-conveying unit 51 is provided with a first re-conveying roller 53 and a second re-conveying roller 54. Both the first re-conveying roller 53 and the second re-conveying roller 54 have a drive roller that is rotatably provided about an axis extending in the left-right direction, and a drive roller and a nip whose peripheral surface abuts on the peripheral surface of the drive roller. It consists of a pair with a driven roller that rotates with the rotation of the driving roller.

During double-sided printing, when the rear end of the sheet S on which an image is formed on one side is conveyed to a state where it is sandwiched between the paper ejection rollers 38, the sheet is conveyed by the reverse rotation of the paper ejection roller 38 and the second conveying roller 37. The transport direction of S is switched back (reversed), and the sheet S is fed to the re-transport path 52. The sheet S fed to the re-transport path 52 is conveyed forward along the re-transport path 52 by the first re-transfer roller 53 and the second re-convey roller 54, and is fed from the re-convey path 52 to the transfer path 31. .. The front and back sides of the sheet S are inverted by being conveyed through the re-conveyance path 52, and the sheet S is conveyed along the transfer path 31 with the other surface on which the image is not formed facing the photoconductor drum 24 side. Then, by forming the image on the other surface of the sheet S, the formation of the image on both sides of the sheet S is achieved. The sheet S on which the image is formed on both sides is conveyed by the second transfer roller 37 toward the paper ejection roller 38, and is ejected onto the paper output tray 13 by the paper ejection roller 38.

<Reconveying unit>
As shown in FIGS. 2 and 3, a left frame 61 extending in the front-rear direction and the up-down direction is provided at the left end portion of the apparatus main body 11. The reconveying unit 51 is detachably attached to the right side of the lower end of the left frame 61 at the bottom of the apparatus main body 11.

The reconveying unit 51 includes a resin upper guide 62 and a lower guide 63, as shown in FIGS. 4 and 5. Both the upper guide 62 and the lower guide 63 have a substantially rectangular plate shape extending in the front-rear direction and the left-right direction. The upper guide 62 and the lower guide 63 are vertically overlapped and fixed to each other by a plurality of bolts 64 as shown in FIG. As shown in FIG. 5, a gap is provided between the upper guide 62 and the lower guide 63, and the gap constitutes a part of the re-transportation path 52.

<Top guide>
The upper guide 62 rotatably holds the two driven rollers 71 of the first re-conveying roller 53 and the driven rollers 72 of the second re-conveying roller 54.

Each driven roller 71 of the first reconveying roller 53 is fitted on the shaft or integrally formed with the shaft. The two driven rollers 71 are arranged at the front end of the upper guide 62 on a common rotation axis extending in the left-right direction at intervals in the left-right direction.

The driven roller 72 of the second reconveying roller 54 is fitted onto the shaft or integrally formed with the shaft. The driven roller 72 is arranged at the left rear end of the upper guide 62. The driven roller 72 is provided so as to be inclined so that the rotation axis is located on the front side toward the right side. Therefore, the driven roller 72 applies a conveying force toward the left front to the seat S. Therefore, the second re-conveying roller 54 including the driven roller 72 has a function of a diagonal feeding roller that transports the seat S while moving it to the left side.

Further, a reinforcing member 73 is attached to the upper surface of the front end portion of the upper guide 62 with a bolt 74. The reinforcing member 73 is made of sheet metal and has a plate shape having substantially the same width as the upper guide 62 in the left-right direction. The reinforcing member 73 is formed with two rectangular openings 75 penetrating in the thickness direction corresponding to the two driven rollers 71. The peripheral surface of each driven roller 72 is exposed from the opening 75.

Further, the front end portion of the upper guide 62 has a notch portion 76 between the two driven rollers 71. The notch 76 cuts the upper guide 62 from the front end edge to a position beyond the common rotation axis of the two driven rollers 71 to the rear side. The front end edge of the reinforcing member 73 is also notched along the notch 76.

The horizontal dimension of the lower guide 63 is the same as the horizontal dimension of the upper guide 62. The front-rear dimension of the lower guide 63 is larger than the front-rear dimension of the upper guide 62, and the front end edge of the lower guide 63 is located on the front side of the front end edge of the upper guide 62. As a result, the front end portion of the lower guide 63 is exposed upward on the front side of the upper guide 62.

<Lower guide>
As shown in FIG. 6, the lower guide 63 is formed with a front roller arranging portion 81, a rear roller arranging portion 82, and a drive shaft accommodating portion 83 as recesses recessed downward.

The front roller arranging portion 81 is provided at a position that is a front end portion of the lower guide 63 and is partially exposed from the notch 76 of the upper guide 62, and extends over substantially the entire width of the lower guide 63 in the left-right direction. The front roller arranging portion 81 accommodates two drive rollers 84 and a shaft 85 of the first reconveying roller 53. The two drive rollers 84 have a cylindrical shape, are fitted on the shaft 85, and are arranged at intervals in the axial direction of the shaft 85.

A substantially U-shaped bearing portion 86 that opens upward is formed at the left end portion of the front roller arrangement portion 81. A shaft insertion portion 87 having a through hole penetrating in the left-right direction is formed at the right end portion of the front roller arrangement portion 81. The shaft 85 of the first reconveying roller 53 is rotatably supported by the lower guide 63 by inserting the right end portion into the shaft insertion portion 87 from the left side and receiving the left end portion by the bearing portion 86 from above. ..

On the left side of the bearing portion 86, a bevel gear 88 having teeth on the outer peripheral surface narrowed to the left side is provided. The left end of the shaft 85 of the first reconveying roller 53 is connected to the bevel gear 88.

The rear roller arranging portion 82 is provided at the left rear end of the lower guide 63 at a position that vertically overlaps with the holding position of the driven roller 72 of the second reconveying roller 54 in the upper guide 62, and extends in the left-right direction. The rear roller arranging portion 82 accommodates the drive roller 91 and the shaft 92 of the second reconveying roller 54. The drive roller 91 has a cylindrical shape and is fitted onto the shaft 92.

Approximately U-shaped bearing portions 93 and 94 open upward are formed at the left end portion and the right end portion of the rear roller arrangement portion 82, respectively. The shaft 92 of the second reconveying roller 54 is rotatably supported by the lower guide 63 by receiving the left end portion and the right end portion thereof by the bearing portions 93 and 94 from above, respectively.

On the left side of the bearing portion 93, a bevel gear 95 having teeth on the outer peripheral surface narrowed to the left side is provided. The left end of the shaft 92 of the second reconveying roller 54 is connected to the bevel gear 95.

The drive shaft accommodating portion 83 is provided at the left end portion of the lower guide 63, and extends over substantially the entire width of the lower guide 63 in the front-rear direction. The drive shaft accommodating portion 83 communicates with the front roller arranging portion 81 and the rear roller arranging portion 82. The drive transmission shaft 96 is housed in the drive shaft housing unit 83.

At the front end of the drive shaft accommodating portion 83, a shaft insertion portion 97 having a through hole penetrating in the front-rear direction is formed. A substantially U-shaped bearing portion 98 open upward is formed at the rear end portion of the drive shaft accommodating portion 83. The drive transmission shaft 96 is rotatably supported by the lower guide 63 because its front end is inserted into the shaft insertion portion 97 from the rear side and the rear end is received by the bearing portion 98 from above.

On the rear side of the shaft insertion portion 97, a front gear 101 made of a bevel gear having teeth on the outer peripheral surface narrowing to the rear side is provided. The front end portion of the drive transmission shaft 96 is inserted through the front gear 101. The teeth of the front gear 101 mesh with the teeth of the bevel gear 88 to which the shaft 85 of the first reconveying roller 53 is connected. As a result, the rotation of the drive transmission shaft 96 is transmitted from the front gear 101 to the bevel gear 88 to rotate the first reconveying roller 53 integrally with the shaft 85.

On the rear side of the bearing portion 98, a rear gear 102 made of a bevel gear having teeth on the outer peripheral surface narrowed to the rear side is provided. The rear end of the drive transmission shaft 96 is connected to the rear gear 102. The teeth of the rear gear 102 mesh with the teeth of the bevel gear 95 to which the shaft 92 of the second reconveying roller 54 is connected. As a result, the rotation of the drive transmission shaft 96 is transmitted from the rear gear 102 to the bevel gear 95 to rotate the second reconveying roller 54 integrally with the shaft 92.

Further, a substantially U-shaped gear receiving portion 103 opened upward is formed at the central portion of the drive shaft accommodating portion 83 in the front-rear direction. An intermediate gear 104 (an example of a fourth gear) is rotatably supported by the gear receiving portion 103. The intermediate gear 104 includes a bevel gear integrally having a cylindrical portion 105 received by the gear receiving portion 103 and a bevel tooth portion 106 arranged on the front side of the gear receiving portion 103 and having teeth on the outer peripheral surface narrowing to the front side. .. An intermediate portion of the drive transmission shaft 96 is inserted and fixed to the intermediate gear 104, and the intermediate gear 104 rotates integrally with the drive transmission shaft 96.

The left wall 107 formed at the left end of the lower guide 63 is provided with a cylindrical gear holding portion 108 penetrating in the left-right direction at a position on the front side of the gear receiving portion 103. An input gear 111 (an example of a third gear) is rotatably held in the gear holding portion 108. The input gear 111 includes a second pin holding portion 112 that is inserted into the gear holding portion 108, and a bevel tooth portion 113 (second tooth portion) that is arranged on the right side of the gear holding portion 108 and has teeth on the outer peripheral surface that narrows to the right side. It consists of a bevel gear that has one example). As shown in FIG. 5, the second pin holding portion 112 has a hollow cylindrical shape open to the left side and has a cylindrical inner surface 114. On the inner surface 114, four second ridges 115a, 115b, 115c, 115d protruding from the inner surface 114 toward the center and extending in the left-right direction are formed at intervals of 90 ° along the circumferential direction. As shown in FIGS. 7, 8 and 9, the left end of each of the second ridges 115a, 115b, 115c, 115d has a triangular plate shape that tapers to the left and forms a plane orthogonal to the left-right direction. It has an inclined surface 116 that is inclined with respect to the inclined surface 116. The bevel tooth portion 113 meshes with the umbrella tooth portion 106 of the intermediate gear 104.

<Drive connection>
As shown in FIG. 2, a lid 121 is attached to the left frame 61 of the apparatus main body 11 at a central portion in the front-rear direction with bolts 122. The lid 121 forms a part of the appearance on the bottom surface of the apparatus main body. As shown in FIG. 3, a drive connecting portion 123 is provided in the portion covered by the lid 121. That is, the drive connection portion 123 is exposed by removing the lid 121 that forms a part of the appearance of the apparatus main body. In the state where the re-conveying unit 51 is mounted on the device main body 11, the driving force of the motor provided in the device main body 11 is transmitted to the re-conveying unit 51 via the drive connection unit 123, and the re-conveying unit 51 is re-conveyed by the driving force. The first re-conveying roller 53 and the second re-conveying roller 54 of the unit 51 are rotationally driven.

As shown in FIGS. 7, 8 and 9, the drive connection unit 123 includes a drive gear 124 (an example of a first gear), a driven gear 125 (an example of a second gear), a bearing member 126, and a rotational force transmission. Pin 127 is provided.

The drive gear 124 is a spur gear and is rotatably supported by the left frame 61.

The driven gear 125 integrally has a spur tooth portion 131 (an example of a first tooth portion), a shaft portion 132, and a first pin holding portion 133. The spur tooth portion 131 has spur teeth on a cylindrical outer peripheral surface and meshes with the drive gear 124. The shaft portion 132 has a substantially cylindrical shape extending to the left from the flat tooth portion 131 on the central axis of the flat tooth portion 131. A hole penetrating left and right is formed in the left frame 61 as a shaft support portion 134, and the shaft portion 132 can rotate and move in the left-right direction to the shaft support portion 134 (an example of the first support portion). It is supported. The first pin holding portion 133 extends from the flat tooth portion 131 to the right side, forms a hollow columnar shape open to the right side, and has a cylindrical inner surface 135. The outer diameter of the first pin holding portion 133 is smaller than the outer diameter of the flat tooth portion 131. On the inner surface 135, first ridge portions 136 protruding from the inner surface 135 toward the center and extending in the left-right direction are formed at intervals of 90 ° along the circumferential direction.

Although two first ridges 136 are shown in FIGS. 7, 8 and 9, the first ridge 136 is along the circumferential direction of the inner surface 135 of the first pin holding portion 133. Four are provided at 90 ° intervals.

As shown in FIG. 10, the bearing member 126 is provided with a cylindrical gear support portion 137 (an example of a second support portion) penetrating in the left-right direction and a center extending in the left-right direction on the right side of the gear support portion 137. A substantially semi-cylindrical intermediate support portion 138 having a wire and opening downward, and a plate-shaped mounting portion 139 extending rearward from between the gear support portion 137 and the intermediate support portion 138 are integrally provided. doing. As shown in FIGS. 7, 8 and 9, the left frame 61 is formed with holding holes 141 penetrating in the left-right direction at positions facing the shaft support portion 134 at intervals from the right side. The gear support portion 137 is inserted into the holding hole 141 from the right side, and as shown in FIG. 3, the mounting portion 139 is inserted into the slit 142 formed in the left frame 61 from below, so that the bearing member 126 is left. It is attached to the frame 61. As shown in FIG. 10, the mounting portion 139 is formed with a grip portion 143 projecting upward from the upper end edge thereof, and the grip portion 143 is gripped by the operator's fingers to slit the mounting portion 139 142. Can be taken in and out of.

The gear support portion 137 of the bearing member 126 receives the first pin holding portion 133 of the driven gear 125 from the left side and supports the driven gear 125 so as to be rotatable and movable in the left-right direction. As a result, in the driven gear 125, the drive position (see FIG. 8) at which the first pin holding portion 133 re-enters the gear supporting portion 137 and the right end of the first pin holding portion 133 remain at the left end portion of the gear supporting portion 137. It can slide to and from the non-driving position (see FIG. 7). The shaft portion 132 is supported by the shaft support portion 134 of the left frame 61, and the first pin holding portion 133 is supported by the gear support portion 137 of the bearing member 126 at both the driven position and the non-driven position of the driven gear 125. Supported by. Further, the spur tooth portion 131 meshes with the drive gear 124 at both the drive position and the non-drive position of the driven gear 125. That is, the spur tooth portion 131 of the driven gear 125 slides to the drive position and the driven position while meshing with the drive gear 124. Therefore, when the drive gear 124 is rotated by the drive force of the motor, the rotational force is transmitted from the drive gear 124 to the spur tooth portion 131, and the driven gear 125 rotates. Further, the driven gear 125 is designed so that a gap is formed between the spur tooth portion 131 and the gear support portion 137 at both the driven position and the non-driven position. More specifically, even at the drive position shown in FIG. 8, there is a gap between the right end portion of the flat tooth portion 131 and the left end portion of the gear support portion 137.

As shown in FIG. 11, the rotational force transmission pin 127 extends in the left-right direction, and substantially hemispherical held portions 144 and 145 are formed at both ends thereof. Further, in the center of the longitudinal force transmission pin 127 in the longitudinal direction, an overhanging portion 146 that projects in the direction orthogonal to the center line of the rotational force transmission pin 127, that is, in the rotational radial direction of the rotational force transmission pin 127 to form a substantially columnar shape. Are formed at intervals from the held portions 144 and 145. The outer diameter of the overhanging portion 146 is smaller than the distance between the tips of the held portions 144 and 145.

In the held portion 144 on the left side, two columnar first protrusions 147 are formed so as to project on both sides of the rotational force transmission pin 127 in the radial direction of rotation. The distance between the tip of one first protrusion 147 in the radial direction of rotation and the tip of the other first protrusion 147 in the radial direction of rotation is larger than the outer diameter of the overhanging portion 146. The held portion 144 is housed in the first pin holding portion 133 of the driven gear 125. Then, each first protrusion 147 is arranged between two first ridges 136 adjacent to each other on the inner surface of the first pin holding portion 133, and each first protrusion 147 is placed on the first pin holding portion 133. Contact the inner surface. As a result, the held portion 144 is supported by the first pin holding portion 133. Further, when the driven gear 125 rotates, the first ridge portion 136 presses the first protrusion portion 147 in the rotational direction, and the rotational force transmission pin 127 rotates in the same direction as the driven gear 125.

With the held portion 144 on the left side supported by the first pin holding portion 133, the rotational force transmission pin 127 extends to the right from the first pin holding portion 133, and the held portion 145 on the right side is the first pin. It is located outside the holding portion 133. In the held portion 145 on the right side, two columnar second protrusions 148 are formed so as to project in the same direction as the first protrusion 147. The distance between the radial tip of the second protrusion 148 on one side and the radial tip of the second protrusion 148 on the other is larger than the outer diameter of the overhang 146. It is equal to the distance between the radial tip of one first protrusion 147 and the radial tip of the other first protrusion 147.

When the driven gear 125 is located in the non-driven position and the held portion 144 on the left side is located at the left end portion in the first pin holding portion 133, as shown in FIG. 7, the second held portion 145 on the right side is held. When the protrusion 148 comes into contact with the intermediate support portion 138 of the bearing member 126, the held portion 145 is supported by the intermediate support portion 138.

When the reconveying unit 51 is mounted on the apparatus main body 11, the bearing member 126 and the input gear 111 of the reconveying unit 51 face each other with a gap. When the driven gear 125 is located at the drive position, the held portion 145 on the right side is housed in the second pin holding portion 112 of the input gear 111 of the reconveying unit 51, as shown in FIG. Then, each of the second protrusions 148 is located between the two second protrusions 115 (for example, between the second protrusions 115a and 115b) that are adjacent to each other in the circumferential direction of the inner surface of the second pin holding portion 112. By being arranged and each second protrusion 148 comes into contact with the inner surface of the second pin holding portion 112, the held portion 145 is supported by the second pin holding portion 112. At this time, the overhanging portion 146 rises at an interval with respect to the intermediate supporting portion 138 of the bearing member 126.

When the driven gear 125 is moved to the right from the state where the held portion 144 on the left side is located at the left end portion in the first pin holding portion 133 while the driven gear 125 is located in the non-driving position, the bearing on the right side is as shown in FIG. The second protrusion 148 of the holding portion 145 passes the intermediate support portion 138 of the bearing member 126 to the right. At this time, the right end portion of the overhanging portion 146 faces the boundary portion between the gear supporting portion 137 and the intermediate supporting portion 138 from the lower side. Therefore, if the held portion 145 is not supported and the rotational force transmission pin 127 is tilted downward to the right, the overhanging portion 146 comes into contact with the boundary portion between the gear support portion 137 and the intermediate support portion 138 and is supported.

When the reconveying unit 51 is mounted on the apparatus main body 11 and the driven gear 125 is located at the drive position, each second protrusion 148 of the held portion 145 on the right side is the second pin of the input gear 111 of the reconveying unit 51. Since it is arranged between the second ridges 115 in the holding portion 112, when the driven gear 125 rotates, the second protrusion 148 presses the second ridge 115 in the rotational direction, and the input gear 111 rotates. It rotates in the same direction as the transmission pin 127.

Then, as understood with reference to FIG. 6, as the input gear 111 rotates, the intermediate gear 104 that meshes with the bevel tooth portion 113 of the input gear 111 rotates, and the drive transmission shaft 96 is integrated with the intermediate gear 104. Rotate to. Further, the front gear 101 and the rear gear 102 rotate integrally with the drive transmission shaft 96, and the bevel gear 88 that meshes with the front gear 101 and the shaft 85 of the first reconveying roller 53 connected to the bevel gear 88 rotate. Further, the bevel gear 95 that meshes with the rear gear 102 and the shaft 92 of the second reconveying roller 54 connected to the bevel gear 95 rotate. In this way, the first re-conveying roller 53 and the second re-conveying roller 54 are rotationally driven, and the sheet S is conveyed by the first re-conveying roller 53 and the second re-conveying roller 54.

The inner surface of the lid 121 is provided with a regulating member 151 that restricts the driven gear 125 from moving from the driven position to the non-driven position to the left when the lid 121 is attached to the left frame 61. The regulating member 151 is formed integrally with the lid 121 and has a plate shape extending in the front-rear direction. When the lid 121 is attached to the left frame 61, the regulating member 151 faces the spur tooth portion 131 of the driven gear 125 from the left side. At the lower end of the regulating member 151, a substantially semicircular notch 152 having a diameter larger than the outer diameter of the shaft portion 132 is formed in order to avoid contact with the shaft portion 132 of the driven gear 125.

<Effect>
As described above, in the device main body 11, the driving force is transmitted from the driving gear 124 to the driven gear 125 by engaging the drive gear 124 and the spur tooth portion 131 of the driven gear 125. The driven gear 125 has a first pin holding portion 133 extending to the right side. The first pin holding portion 133 holds the held portion 144 of the rotational force transmission pin 127. Further, the driven gear 125 is provided so as to be slidable between the driving position and the non-driving position on the left side of the driving position.

On the other hand, the reconveying unit 51 detachably provided on the apparatus main body 11 is provided with an input gear 111 having a second pin holding portion 112. The second pin holding portion 112 is open to the left side and accommodates the other end of the rotational force transmission pin 127 when the driven gear 125 is located at the drive position. At least when the driven gear 125 is located in the non-driving position, the held portion 145 of the rotational force transmission pin 127 can be separated from the second pin holding portion 112. The reconveying unit 51 can be removed from the apparatus main body 11 by separating the held portion 145 of the rotational force transmission pin 127 from the second pin holding portion 112. Therefore, the reconveying unit 51 can be replaced with a new one with a simple configuration.

A first protrusion 147 is formed on the held portion 144 of the rotational force transmission pin 127, and a second protrusion 148 is formed on the held portion 145. Correspondingly, the first pin holding portion 133 is formed with a first ridge portion 136 that contacts the first protrusion portion 147 and the rotational force transmission pin 127 in the rotational direction. Further, the second pin holding portion 112 is formed with a second ridge portion 115 that contacts the second protrusion portion 148 and the rotational force transmission pin 127 in the rotational direction. Therefore, when the driven gear 125 rotates while the held portion 144 of the rotational force transmission pin 127 is housed in the first pin holding part 133 and the held part 145 is housed in the second pin holding part 112, the first A rotational force is input from the first protrusion 136 of the pin holding portion 133 to the first protrusion 147 of the rotational force transmission pin 127, the rotational force transmission pin 127 rotates, and the second protrusion of the rotational force transmission pin 127 A rotational force is transmitted from 148 to the second ridge 115, and the input gear 111 rotates. As a result, the transmission of the driving force, which is the rotational force, from the apparatus main body 11 to the reconveying unit 51 is achieved.

The left side of the driven gear 125 is supported by the shaft support portion 134 of the left frame 61, and the right side is supported by the gear support portion 137 of the bearing member 126, so that the driven gear 125 is driven even if a large driving force is input to the driven gear 125. It is possible to prevent the position of the gear 125 from being displaced in the direction intersecting the rotation axis of the driven gear 125, and it is possible to prevent the held portion 145 of the rotational force transmission pin 127 from coming off from the second pin holding portion 112. As a result, the driving force transmission path from the apparatus main body 11 to the reconveying unit 51 can be maintained satisfactorily.

Further, since the driven gear 125 and the input gear 111 are connected by the rotational force transmission pin 127, even if the center of the driven gear 125 and the center of the input gear 111 are not aligned in a straight line, the misalignment is allowed. Then, the rotational force of the driven gear 125 can be transmitted to the input gear 111 via the rotational force transmission pin 127.

The second ridge portion 115 formed on the input gear 111 has an inclined surface 116 at the left end portion that is inclined with respect to a plane orthogonal to the left-right direction. Therefore, when the driven gear 125 is slid from the non-driving position to the driving position and the held portion 145 of the rotational force transmission pin 127 is inserted into the second pin holding portion 112, the second protruding portion 148 is inclined surface 116. You will be guided by contacting. Therefore, the second protrusion 148 can be easily arranged between the two second ridges 115 adjacent to each other.

The driven gear 125 can slide between the driven position and the non-driven position while maintaining the meshing between the drive gear 124 and the spur tooth portion 131. Therefore, the engagement between the drive gear 124 and the spur tooth portion 131 and the disengagement thereof are not repeated. As a result, when the driven gear 125 is displaced from the non-driving position to the driving position, the driving gear 124 and the spur tooth portion 131 do not mesh with each other, and the driving force is transmitted from the apparatus main body 11 to the reconveying unit 51. It is possible to smoothly switch between the state of being displaced and the state of not being transmitted.

An intermediate support portion 138 is provided on the right side with respect to the first pin holding portion 133. On the rotational force transmission pin 127, an overhanging portion 146 is formed over the entire circumference at a position intermediate between the held portions 144 and 145 at both ends. When the reconveying unit 51 is mounted on the apparatus main body 11 and the driven gear 125 is arranged in the non-driving position, the first protrusion 147 is in contact with and supported by the first pin holding portion 133, and the second protrusion The portion 148 is in contact with and supported by the second pin holding portion 112, or the overhanging portion 146 is in contact with and supported by the intermediate support portion 138. Therefore, it is possible to prevent the rotational force transmission pin 127 from tilting too much with respect to the rotation axis of the input gear 111. As a result, the held portion 145 of the rotational force transmission pin 127 can be more smoothly inserted into the second pin holding portion 112 of the input gear 111.

The intermediate support portion 138 and the overhanging portion 146 are formed when the driven gear 125 is located at the drive position and the held portion 145 of the rotational force transmission pin 127 is accommodated in the second pin holding portion 112 of the input gear 111. It is formed so that there is a gap between them. As a result, it is possible to prevent the intermediate support portion 138 and the overhanging portion 146 from sliding when the rotational force transmission pin 127 rotates, and it is possible to suppress the generation of noise and wear due to the sliding.

Further, since the intermediate support portion 138 is open to the lower side, the rotational force transmission pin 127 is exposed at least on the intermediate support portion 138. Therefore, the operator who attaches the reconveying unit 51 to the apparatus main body 11 can visually recognize the position of the rotational force transmission pin 127.

The gear support portion 137 of the bearing member 126 is formed so as to face the spur tooth portion 131 of the driven gear 125 with a gap in the left-right direction when the driven gear 125 is located at the drive position. As a result, it is possible to suppress the sliding of the driven gear 125 and the gear support portion 137 when the driven gear 125 is rotated, and it is possible to suppress the generation of noise and wear due to the sliding.

Since the first pin holding portion 133 is opened to the right side, it is easy to move the rotational force transmission pin 127, and the held portion 144 of the rotational force transmission pin 127 with the reconveying unit 51 detached from the apparatus main body 11. Can be detached from the first pin holding portion 133.

The input gear 111 has a bevel tooth portion 113 having bevel teeth formed on the outer periphery thereof, and the reconveying unit 51 includes an intermediate gear 104 formed of a bevel gear that meshes with the bevel teeth of the input gear 111. In a configuration in which the bevel teeth of the intermediate gear 104 and the bevel teeth of the input gear 111 mesh with each other, high accuracy is required for the relative positions of the intermediate gear 104 and the input gear 111. Since the rotational force transmission pin 127 is configured to move with respect to the input gear 111, the state in which the driving force is transmitted from the device main body 11 to the reconveying unit 51 without moving the input gear 111 and the state in which the driving force is not transmitted can be determined. You can switch.

Further, when the lid 121 is attached to the device main body 11, the driven gear 125 and the rotational force transmission pin 127 are covered with the lid 121, and when the lid 121 is removed from the device main body 11, the driven gear 125 and the rotational force transmission are transmitted. Pin 127 is exposed. As a result, the operator can move the driven gear 125 and the rotational force transmission pin 127 with his / her fingers to switch between a state in which the driving force is transmitted from the apparatus main body 11 to the reconveying unit 51 and a state in which the driving force is not transmitted. Therefore, the reconveying unit 51 can be easily replaced.

Further, in the state where the lid 121 is attached to the apparatus main body 11, the regulating member 151 integrally formed with the lid 121 faces the first pin holding portion 133 from the left side, so that the driven gear 125 is not driven from the drive position. Moving to the left towards the position is restricted. As a result, the driven gear 125 can be held at the driving position in a state where the driving force is transmitted from the apparatus main body 11 to the reconveying unit 51. And, unlike the configuration in which the regulating member 151 is formed separately from the lid 121, there is no risk of losing the regulating member 151.

<Modification example>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other embodiments.

For example, in the above-described embodiment, the held portion 144 on the left side of the rotational force transmission pin 127 is configured to be detachable from the inside of the first pin holding portion 133, but for example, at the right end portion of the first pin holding portion 133. A configuration may be adopted in which the held portion 144 does not separate from the inside of the first pin holding portion 133, such as forming a wall portion that prevents the held portion 144 from separating from the inside of the first pin holding portion 133.

Further, although the configuration in which two first protrusions 147 are formed on the left side held portion 144 and two second protrusions 148 are formed on the right side held portion 145 is taken up, the first protrusion portion is taken up. The number of each of the 147 and the second protrusion 148 may be one.

Further, it is assumed that four second ridges 115a, 115b, 115c, 115d are formed on the inner surface 114 of the second pin holding portion 112, but two second ridges 115a, It may be configured in which 115c or two second ridges 115b, 115d are formed. Similarly, it is assumed that four first ridges 136 are formed on the inner surface 135 of the first pin holding portion 133, but on the inner surface 135, two first ridges 136 are formed around the inner surface 135. It may be formed at 180 ° intervals along the direction.

The present invention is applied not only to a printer having only an image forming function for forming an image on a sheet S, but also to a multifunction device having a function such as an image reading function for reading an image of a document in addition to the image forming function. May be good.

In addition, various design changes can be made to the above-mentioned configuration within the scope of the matters described in the claims.

1: Color laser printer 11: Device body 14: Image forming unit 51: Reconveying unit 104: Intermediate gear 111: Input gear 112: Second pin holding part 133: First pin holding part 113: Bevel tooth parts 115a, 115b, 115c, 115d: 2nd ridge 136: 1st ridge 116: Inclined surface 121: Lid 124: Drive gear 125: Driven gear 127: Rotational force transmission pin 131: Spur tooth part 137: Gear support part 138: Intermediate Support part 147: First protrusion 148: Second protrusion 151: Regulator S: Sheet

Claims (11)

With the device body
Including a re-conveying unit provided detachably on the device body.
The device body
An image forming part that forms an image on the sheet,
A first gear that is rotatably provided around a rotation axis extending in a predetermined direction and to which a driving force from a driving source is transmitted.
It has a first tooth portion having teeth meshing with the first gear on the outer circumference and a hollow first pin holding portion extending to one side in the predetermined direction, and has a drive position and a drive position higher than the drive position. A second gear that is slidably provided between the non-driving position on the other side in the predetermined direction and
A first support portion that rotatably supports the second gear on the other side in the predetermined direction from the first pin holding portion.
A second support portion that rotatably supports the second gear on one side of the predetermined direction with respect to the first support portion.
A rotational force transmission pin whose one end is arranged in the first pin holding portion and is held by the first pin holding portion and projects from the first pin holding portion to the one side in the predetermined direction.
A regulating member for restricting the movement of the second gear from the driving position to the other side in the predetermined direction is provided.
The re-transport unit
A unit having a configuration in which a sheet in which an image is formed on one surface by the image forming portion is retransmitted to the image forming portion.
A third gear having a second tooth portion having teeth formed on the outer periphery and a hollow second pin holding portion extending to the other side in the predetermined direction is provided.
The rotational force transmission pin is formed with a first protrusion that projects in the rotational radial direction of the rotational force transmission pin at one end thereof, and projects in the rotational radial direction at the other end opposite to the one end portion. A second protrusion is formed,
On the inner surface of the first pin holding portion, a ridge extending in the predetermined direction is formed, and a first ridge portion that abuts the first protrusion in the rotational direction of the rotational force transmission pin is formed.
On the inner surface of the second pin holding portion, a ridge extending in the predetermined direction is formed, and a second ridge portion abutting the second protrusion in the rotation direction is formed.
The second pin holding portion is opened to the other side in the predetermined direction to accommodate the other end portion of the rotational force transmission pin when the second gear is located at the driving position, and at least the second pin holding portion is accommodated. 2 An image forming apparatus having a configuration in which the other end of the rotational force transmission pin can be detached when the gear is located at the non-driving position. The image forming apparatus according to claim 1.
The second ridge portion is an image forming apparatus having an inclined surface inclined with respect to a surface orthogonal to the predetermined direction at an end portion on the other side of the predetermined direction. The image forming apparatus according to claim 1 or 2.
The image forming apparatus has a configuration in which the second gear can slide between the drive position and the non-drive position while maintaining the meshing between the first gear and the first tooth portion. The image forming apparatus according to any one of claims 1 to 3.
An intermediate support portion is provided on one side of the first pin holding portion in the predetermined direction.
The rotational force transmission pin has the first protrusion and the second protrusion at positions between the one end and the other end and facing the intermediate support in the radial direction of rotation. Overhanging portions protruding in the rotational radial direction are formed over the entire circumference at intervals in the predetermined direction.
In a state where the reconveying unit is mounted on the apparatus main body and the second gear is arranged in the non-driving position, the first protrusion is the first regardless of the position of the rotational force transmission pin. The second protrusion is contacted and supported by the second pin holding portion, or the overhanging portion is contacted and supported by the intermediate support portion. Image forming device. The image forming apparatus according to claim 4.
The intermediate support portion and the overhanging portion are between each other when the second gear is located at the drive position and the other end portion of the rotational force transmission pin is accommodated in the second pin holding portion. An image forming apparatus that is formed so as to create a gap in the image forming apparatus. The image forming apparatus according to claim 4 or 5.
An image forming apparatus in which the intermediate support portion is open to the lower side. The image forming apparatus according to any one of claims 1 to 6.
The second support portion is formed so as to face the first tooth portion of the second gear with a gap in the predetermined direction when the second gear is located at the drive position. , Image forming device. The image forming apparatus according to any one of claims 1 to 7.
The first pin holding portion is opened to the one side in the predetermined direction, and the one end portion of the rotational force transmission pin can be detached in a state where the reconveying unit is detached from the apparatus main body. , Image forming device. The image forming apparatus according to any one of claims 1 to 8.
The third gear has an umbrella tooth as the tooth formed on the outer circumference thereof.
The reconveying unit is an image forming apparatus further comprising a fourth gear composed of a bevel gear that meshes with the bevel teeth of the third gear. The image forming apparatus according to any one of claims 1 to 9.
The device main body covers the second gear and the rotational force transmission pin when attached to the device main body, and exposes the second gear and the rotational force transmission pin when the device main body is removed from the device main body. An image forming apparatus further including a lid. The image forming apparatus according to claim 10.
The regulating member is an image forming apparatus provided integrally with the lid.

Images