JP2020015620A - Sheet holding device, sheet feeding device, and image forming device - Google Patents

Abstract

To accurately detect a rotation angle of a rotating member from a detection result of rotation position detection means.SOLUTION: There is provided a sheet holding device, including: a regulating member that can move in a direction to approach and separate from an end of a sheet; a rotating member 84a that rotates according to a movement of the regulating member; a detected member 83a attached to the rotating member and integrally rotating; and rotational position detecting means for detecting a rotational position of the detected member, and configured such that the detected member rotates integrally with the rotating member, due to a contact of a contact portion 84b of the rotating member and a contacted portion 83c of the detected member from a rotating direction of the rotating member. The sheet holding device further includes an urging member 85 for applying an urging force F between the rotating member and the detected member for maintaining a contact state of the contact portion and the contacted portion.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a sheet holding device, a sheet feeding device, and an image forming device.

  Conventionally, a regulating member movable in a direction approaching and separating from an end of a sheet, a rotating member that rotates in accordance with the movement of the regulating member, and a detected member attached to the rotating member and integrally rotating There is known a sheet holding device including a rotation position detection unit that detects a rotation position of the detected member.

  For example, Patent Document 1 discloses a document tray (sheet holding device) including a centering positioning mechanism that always matches the center of the document in the width direction with the center of the fixed tray even when the size of the document changes. The centering positioning mechanism includes a pinion and a pair of racks provided on both sides of the pinion and engaged with the pinion and guided in mutually passing directions (document width direction). Each of the rack pairs is provided with a width-shifting plate, and each width-shifting plate is movable in a direction approaching / separating from the widthwise end of the document. A gear attached to the input shaft of the rotary sensor meshes with one of the rack pairs, and the rack pair moves when the user grips and moves one of the width shift plates, thereby rotating the gears, and The amount of rotation is detected by a rotary sensor. The detection result of this rotary sensor (the amount of rotation of the input shaft) is used for determining the size of the document in the width direction.

  In a configuration as disclosed in Patent Document 1, when a gear (rotating member) is attached to an input shaft (detected member) of a rotary sensor (rotational position detecting means), a play that may cause backlash is adopted. The rotation angle of the gear cannot be accurately detected from the detection result.

  In order to solve the above-described problem, the present invention provides a regulating member that can move in a direction approaching and separating from an end of a sheet, a rotating member that rotates in accordance with the movement of the regulating member, and a rotating member. A sheet holding device comprising: a member to be detected that is attached and rotates integrally; and a rotational position detecting unit that detects a rotational position of the member to be detected, wherein a contact portion of the rotational member is a member to be detected. The detection member is rotated integrally with the rotation member by contacting the rotation member with respect to the contact portion of the rotation member. A biasing member for applying a biasing force for maintaining the contact state between the rotating member and the detected member.

  According to the present invention, there is an excellent effect that the rotation angle of the rotating member can be accurately detected from the detection result of the rotation position detecting means.

FIG. 1 is a schematic diagram illustrating a copying machine according to an embodiment. FIG. 2 is an external perspective view illustrating a manual sheet feeding device of the copying machine. FIG. 3 is a perspective view of a manual feed tray according to the embodiment. It is a top view which shows the moving mechanism of the side fence in the manual feed tray. (A)-(c) is an explanatory view in case a gap occurs between a detection result of a rotary sensor and a rotation amount of a gear. It is explanatory drawing which shows the connection structure of the rotation shaft of the gear and the engagement hole of a rotor in embodiment. FIG. 4 is a perspective view showing a state in which a rotation shaft of the gear is fitted in an engagement hole of a rotor of the rotary sensor and a spring is not yet attached. (A) is explanatory drawing which shows the shape of the spring before assembling, (b) is explanatory drawing which shows the shape of the spring after assembling. FIG. 3 is a perspective view, partially in section, showing a state in which a rotation shaft of the gear is fitted into an engagement hole of a rotor of the rotary sensor and a spring is attached. The perspective view which shows the same gear by itself. FIG. 5 is an enlarged view of a gear in a portion provided with an eave portion for preventing the spring from coming off the space G; FIG. 12 is a perspective view showing the gear shown in FIG. 11 in a partial cross section. (A) is a description of a case where the length x of the D-cut surface and the length y of the notch have a relationship of integrally rotating the rotor and the gear in a cross section orthogonal to the axial direction of the rotating shaft of the gear. FIG. (B) is a relationship in which the length x of the D-cut surface and the length y of the notch cannot rotate the rotor and the gear integrally in a cross section orthogonal to the axial direction of the rotation axis of the gear. FIG. The perspective view in the state where the gear was removed from the rotary sensor. FIG. 4 is a perspective view of a state where a rotary sensor is removed from a base of a manual feed tray. The top view in the state where the gear was removed from the rotary sensor. FIG. 3 is a perspective view showing a rotary sensor to which a gear is attached and a partial cross section around the rotary sensor. Sectional drawing of the vicinity of the meshing part of a gear and a rack. Explanatory drawing of the drag E against the restoring force (elastic force) of the elastic deformation of the spring, which is received by inserting the bent end portion into the space of the rotor and attaching the spring to the entrance edge of the space when the spring is attached. . (A) is an explanatory view showing the shape of the spring before modification in modification 1. (B) is an explanatory view showing a state of a spring during assembly. (C) is an explanatory view showing the shape of the spring after assembly. FIG. 14 is a perspective view showing a grip portion in Modification Example 2. FIG. 13 is a perspective view showing a state in which the connection portion between the spring and the gripping portion is lifted and the winding direction of the wire forming the gripping portion is reversed in Modification Example 2.

Hereinafter, an embodiment in which a sheet holding device according to the present invention is applied to a manual feed tray of a copying machine as an image forming apparatus will be described.
FIG. 1 is a schematic diagram showing a copying machine 1 according to the present embodiment.
The copying machine 1 according to the present embodiment includes an image forming apparatus main body 2, an image reading device 3 disposed on the image forming apparatus main body 2, and a table-shaped feeding device disposed below the image forming apparatus main body 2. The image forming apparatus includes a paper device 4 and an automatic document feeder 5 disposed on the image reading device 3 so as to be freely opened and closed. Further, the copying machine 1 includes a switchback device 42 and a manual sheet feeding device 70.

  The image forming apparatus main body 2 includes a drum-shaped photoconductor 10 as an image carrier therein. A charging device 11 is disposed around the photoconductor 10 on the left side in the figure, and a developing device 12, a transfer device 13, and a cleaning device 14 are arranged along the rotation direction of the photoconductor 10 (counterclockwise direction: arrow A in the diagram). Is arranged. The transfer device 13 is configured by looping a transfer belt 17 between upper and lower rollers 15 and 16, and is configured to press the transfer belt 17 against the peripheral surface of the photoconductor 10 at a transfer position T.

  On the left side of the charging device 11 and the cleaning device 14, a toner replenishing device 20 for replenishing the developing device 12 with new toner is disposed. Further, inside the image forming apparatus main body 2, there is arranged a sheet conveying device D1 for sending out a sheet such as a sheet of paper or an OHP sheet from a supply position described later and conveying the sheet to a stack position via a transfer position T. The sheet conveyance device D1 includes a supply path R1, a manual supply path R2, and a sheet conveyance path R described later. The sheet conveyance path R has a substantially L-shape that extends from the bottom to the top in the drawing and passes to the left after passing between the photoconductor 10 and the transfer device 13.

  In the sheet conveyance path R, a registration roller 21 is disposed at a position upstream of the photoconductor 10 in the sheet conveyance direction. Further, a fixing device 22 is disposed at a downstream position of the photoconductor 10 in the sheet conveying direction. The fixing device 22 includes a pair of fixing rollers (fixing roller rotating bodies) 31 and 32. A fixing heater is disposed inside one fixing roller 31, and a pressure spring and a pressure arm are disposed around the other fixing roller 32. With this pressure spring and pressure arm, one fixing roller 31 is pressed against the other fixing roller 32. A thermistor and a thermostat are arranged on one fixing roller 31.

  The fixing heater keeps one of the fixing rollers 31 at a predetermined temperature by turning on or off the fixing heater with a thermostat while measuring the temperature of the fixing roller 31 with a thermistor.

  A discharge branch claw 34, a discharge roller 35, a first pressure roller 36, a second pressure roller 37, and a waist roller 38 are disposed further downstream of the fixing device 22 in the sheet conveyance direction. A discharge stack section (discharge position) 39 for stacking the sheets is disposed.

  A laser writing device 47 is disposed on the left side of the developing device 12 in the drawing. The laser writing device 47 includes a laser light source, a rotating polygon mirror 48 for scanning, a polygon motor 49, and a scanning optical system 50 such as an fθ lens.

  The image reading device 3 includes a light source 53, a plurality of mirrors 54, an imaging optical lens 55, an image sensor 56 such as a CCD, and the like, and a contact glass 57 is disposed on the upper surface.

  One end of the automatic document feeder 5 is connected to one end of the upper surface of the image reading device 3 by a connector having a hinge structure. In the automatic document feeder 5, the inclination angle with respect to the upper surface of the contact glass 57 is, for example, 90 degrees at a maximum from the horizontal state in which the lower surface presses the original paper placed on the upper surface of the contact glass 57 from above. So that it can be opened and closed freely. The automatic document feeder 5 includes a mounting table at a document mounting position and a discharge table at a discharge position, and discharges a sheet such as a document from the mounting table via a reading position on the contact glass 57 of the image reading device 3. A sheet conveying device having a document conveying path for conveying to a table is provided. The sheet conveying device includes a plurality of sheet conveying rollers (sheet conveying rotating bodies) for conveying a sheet such as a document.

  The sheet feeding device 4 includes a multi-stage sheet separating device 61 which is a feeding position of the sheet S. Each sheet separation device 61 includes a pickup roller (feed roller) 62, a feed roller (feed roller) 63, and a reverse roller (separation roller) 64, respectively. A supply path R1 is formed on the right side in the drawing of the sheet separation devices 61 arranged in multiple stages, and the supply path R1 communicates with the sheet conveyance path R of the image forming apparatus main body 2. The supply path R1 includes several sheet conveying rollers (sheet conveying rotating bodies) 66 for conveying the sheet.

  The switchback device 42 is arranged on the right side surface of the image forming apparatus main body 2 in the drawing. The switchback device 42 includes a sheet conveyance device D2 that branches from the position of the discharge branch claw 34 in the sheet conveyance path R. The sheet conveying device D2 includes a reversing path R3 leading to a switchback position 44 where a pair of switchback rollers 43 are disposed, and a re-conveying path R4 leading from the switchback position 44 to the registration rollers 21 of the sheet conveying path R again. Have. The sheet conveying device D2 has a plurality of sheet conveying rollers (sheet conveying rotating bodies) 66 for conveying the sheet. In the present embodiment, the switchback device 42 is configured to be attached to an opening / closing member 71 described later.

  The manual sheet feeding device 70 is disposed on the right side surface of the image forming apparatus main body 2 in the drawing. The manual sheet feeding device 70 includes a pickup roller (feeding roller) 67A, a feed roller (feeding roller) 67B, and a reverse roller (feeding roller) 67C, and transfers the sheets S stacked on the manual feed tray 72 to the image forming apparatus main body. The sheet is supplied to the second sheet transport path R.

Next, the operation of the copying machine 1 will be described.
First, in order to generate a copy using the copying machine 1, a main switch is turned on and a document is set on the automatic document feeder 5. Alternatively, the automatic document feeder 5 is opened, a document is directly set on the contact glass 57 of the image reading device 3, and the automatic document feeder 5 is closed and pressed.

  Then, when the start switch is pressed, when the original is set in the automatic document feeder 5, the original is moved to the contact glass 57 through the original feed path by the sheet feed roller, and then the image reading device 3 is driven. The original is read and discharged onto a discharge table. On the other hand, when the original is set directly on the contact glass 57, the image reading device 3 is driven immediately.

  When the image reading device 3 starts to be driven, the light source 53 moves along the contact glass 57 while emitting light, and irradiates the original surface on the contact glass 57 with light. The plurality of mirrors 54 receive reflected light from the document surface and reflect the light toward the imaging optical lens 55. The imaging optical lens 55 forms an image of the reflected light on the image sensor 56. Thereby, the image sensor 56 reads the contents of the document.

  At the same time, the photoreceptor 10 is rotated by the photoreceptor drive motor, and accordingly, the surface of the photoreceptor is uniformly charged by the charging device 11 using a charging roller. By irradiating the surface of the photoconductor with a laser beam in accordance with the contents of the document read by the image reading device 3, writing is performed on the surface of the photoconductor, whereby an electrostatic latent image is formed on the surface of the photoconductor 10. . Thereafter, when the portion of the electrostatic latent image formed on the surface of the photoconductor faces the developing device 12, the toner is attracted to the surface of the photoconductor and the electrostatic latent image is visualized.

  Further, when the start switch is pressed, the corresponding sheet separating device 61 is selected from the plurality of sheet separating devices 61 provided in multiple stages in the sheet feeding device 4 based on the sheet size selection signal. Then, a pickup roller 62 corresponding to the sheet separating device 61 feeds out one sheet S in the sheet separating device 61. The reverse roller 64 separates the uppermost one sheet S when sending out a plurality of sheets S, and prevents conveyance of the remaining sheets S. Subsequently, the feed roller 63 feeds the sheet S into the supply path R1 while conveying the sheet S, and the sheet conveyance roller 66 continuously conveys the sheet S and guides the sheet S to the sheet conveyance path R. Stop transport. Then, the registration roller 21 rotates in synchronization with the rotation of the photoconductor 10 described above, and feeds the sheet S to the right side of the photoconductor 10.

  When performing manual sheet feeding, the manual tray 72 of the manual sheet feeding device 70 is shifted from the closed state in the upright position to the open state in the inclined position as shown in FIG. 1, and the sheet stacking surface 72B of the manual tray 72 is moved. Set the sheet on top. When the start switch is pressed, the pickup roller 67A feeds out one sheet, and subsequently, the feed roller 67B takes over the feeding of the sheet. The reverse roller 67C separates the uppermost one sheet when trying to send out a plurality of sheets, and prevents conveyance of the remaining sheets. The sheet transport roller 66 continuously transports the sheet supplied to the manual feed path R2 and guides the sheet to the sheet transport path R. Thereafter, similarly to the above-described paper feeding device 4, the registration roller 21 feeds the photosensitive drum 10 to the right side in synchronization with the rotation of the photosensitive drum 10.

  Next, when the sheet S sent to the right side of the photoconductor 10 reaches the transfer position T, the transfer device 13 transfers the toner image on the photoconductor 10 to the sheet S to form an image. The cleaning device 14 removes and cleans the residual toner on the photoconductor 10 after the image transfer, and then the static elimination device removes the residual potential on the photoconductor 10 and prepares for the next image formation starting from the charging device 11. .

  Next, the fixing device 22 conveys the sheet S to which the toner image is transferred by the transfer belt 17 and passes between the pair of fixing rollers 31 and 32, and applies heat and pressure at the fixing position to fix the transferred image. . The sheet S on which the fixing has been performed is then flattened and crimped in the process of passing through the first pressure roller 36, the discharge roller 35, the second pressure roller 37, and the waist roller 38, and the discharge stack unit Ejected onto 39 and stacked there.

  When transferring an image to both sides of the sheet S, the discharge branch claws 34 are switched. Then, the sheet S on which the image has been transferred to the front surface enters the reversing path R3 from the sheet conveying path R, is conveyed by the sheet conveying rollers 66, enters the switchback position 44, and switches back at the switchback position 44. Thereafter, the sheet is put into the re-conveying path R4, reversed, conveyed by the sheet conveying roller 66, guided again to the sheet conveying path R, and the image is transferred to the back surface of the sheet in the same manner as described above.

FIG. 2 is an external perspective view showing the manual sheet feeding device 70.
As shown in FIG. 1, the manual sheet feeder 70 according to the present embodiment includes an opening / closing member 71 that has a rotation fulcrum 71 </ b> A at a lower portion with respect to the image forming apparatus main body 2 and opens and closes at an upper portion. It has a manual feed tray 72 that has a rotation fulcrum 72A at the lower part and the upper part opens and closes. Further, as shown in FIG. 2, the manual sheet feeding device 70 includes a link member 73 that connects the opening and closing member 71 to the image forming apparatus main body 2 so as to be able to open and close.

  In order to easily remove jammed sheets jammed in the sheet conveying path R and the re-conveying path R4 and to easily perform maintenance of the inside of the image forming apparatus main body 2, the opening and closing member 71 is set to the open state with the inclined posture. R and the re-transport path R4 are opened. That is, the manual sheet feeding device 70 removes a jammed sheet, performs maintenance, and the like by opening the sheet transport path R and the re-transport path R4 by setting the opening / closing member 71 from the closed state in the upright position to the open state in the inclined position. Can be done easily.

  Further, the manual sheet feeding device 70 sets the manual tray 72 from the closed state in the upright position to the open state in the inclined position (see FIG. 1), and stacks the sheets on the sheet stacking surface 72B of the manual tray 72, thereby forming a sheet for manual feeding. The sheet can be supplied to the sheet transport path R.

FIG. 3 is a perspective view of the manual feed tray according to the present embodiment.
As shown in FIG. 3, the manual feed tray 72 as a sheet holding device is provided with side fences 74A and 74B and a guide rail 75. The side fences 74A and 74B are installed in the sheet width direction (Y direction) in the space above the sheet stacking surface 72B (the stacking space for the sheets S).

  In the manual feed tray 72 of the present embodiment, a guide rail 75 as a guide portion is provided extending in the sheet width direction (Y direction). A pair of side fences 74A and 74B respectively installed at both ends in the sheet width direction so as to sandwich the sheet S are arranged along the guide rails 75 so as to come into contact with and separate from the width direction end of the sheet S (in the sheet width direction). ) Is manually movable, and is positioned in accordance with the size of the sheet S in the width direction. That is, the side fences 74A and 74B function as regulating members for regulating the position of the sheet S in the width direction.

  In the manual feed tray of the present embodiment, an end fence may be provided on the upstream side in the sheet feeding direction (X direction) in the space above the sheet stacking surface 72B (the stacking space of the sheets S). Specifically, for example, a guide rail serving as a guide portion is provided on the manual feed tray 72 so as to extend in the sheet feeding direction (X direction), and the end fence is movable along the guide rail in the sheet feeding direction. Install. The end fence is positioned according to the size of the sheet S placed on the sheet stacking surface 72B in the feeding direction. That is, the end fence functions as a regulating member that regulates the end position of the sheet S in the feeding direction.

  In the present embodiment, the pair of side fences 74A and 74B are configured to work together to increase or decrease the widthwise interval. That is, when one side fence 74A, 74B is manually moved in the + Y direction, the other side fence 74B, 74A moves in conjunction with the -Y direction. When one of the side fences 74A, 74B is manually moved in the -Y direction, the other side fence 74B, 74A moves in conjunction with the + Y direction.

  In FIG. 3, the sheet S is fed in the X direction, and the manual feed tray 72 can be inserted and removed in the Y direction. However, the present invention is not limited to these directions.

FIG. 4 is a plan view showing a moving mechanism of the side fences 74A and 74B in the manual feed tray 72 of the present embodiment.
The moving mechanism of the side fences 74A, 74B in the present embodiment has a pair of side fences 74A, 74B such that the widthwise center of the sheet S coincides with the widthwise center of the bottom plate 24 even if the width of the sheet S changes. Move in conjunction with each other. In the present embodiment, a pinion rack mechanism is used as a moving mechanism of the side fences 74A and 74B.

  Specifically, as shown in FIG. 4, racks 81A and 81B are provided on the side fences 74A and 74B, respectively. Each of the racks 81A and 81B is engaged with the pinion so as to sandwich the pinion 82 disposed substantially at the center in the sheet width direction from both sides. Thus, when one of the side fences 74A, 74B is moved in the sheet width direction, the racks 81A, 81B of the side fences 74A, 74B move in the sheet width direction in conjunction with each other, and rotate the pinion 82. The rotation of the pinion 82 causes the other racks 81B and 81A to move in the passing direction along the sheet width direction, and the other side fences 74B and 74A move in the sheet width direction in conjunction with the movement.

  In this embodiment, a gear (rotating member) 84 meshes with one rack 81A. The rotation shaft 84a of the gear 84 is fitted and connected to an engagement hole 83b formed in a rotor (detected member) 83a of the rotary sensor 83. For example, when the user moves the side fence 74A in the sheet width direction, the rack 81A of the side fence 74A moves in the sheet width direction in conjunction therewith, and rotates the gear 84 meshing with the rack 81A. Accordingly, the rotor 83a of the rotary sensor 83 connected to the gear 84 rotates integrally with the gear 84, and the rotation amount of the rotor 83a is detected by the rotary sensor 83. The detection result of the rotary sensor 83 (the rotation amount of the rotor 83a) is sent to the control unit of the image forming apparatus, and is used, for example, to determine the width direction size of the sheet S set on the manual feed tray 72.

FIGS. 5A to 5C are explanatory diagrams illustrating a case where a deviation occurs between the detection result of the rotary sensor 83 (the rotation amount of the rotor 83a) and the rotation amount of the gear 84 (the positions of the side fences 74A and 74B). .
In the present embodiment, the connection between the rotor 83a of the rotary sensor 83 and the gear 84 is an engagement surface that engages the D-cut surface (contact portion) 84b with the rotation shaft 84a of the gear 84 as a D-cut shaft. The engagement hole 83b of the rotor 83a is formed in a D-cut shape so that the inner wall flat portion (contacted portion) 83c is formed, so that the rotor 83a and the gear 84 rotate integrally.

  Here, as shown in FIG. 5 (a), such a connecting structure is formed by the D-shaped engaging hole 83b and the dimensional variation of the rotating shaft 84a which is a D-cut shaft fitted into the engaging hole 83b. A gap C may occur between the D-cut surface 84b and the inner wall flat portion 83c of the engagement hole 83b. When such a gap C exists, the contact state between the D-cut surface 84b formed on the rotation shaft 84a of the gear 84 and the inner wall flat portion 83c of the engagement hole 83b of the rotor 83a is not uniquely determined.

  More specifically, when the side fences 74A and 74B are moved in a direction to increase the distance between each other, as shown in FIG. 5B, the rotation shaft 84a of the gear 84 interlocks with this, as shown in FIG. , And relative to the engagement hole 83b of the rotor 83a by the gap C. As a result, one end (the right end in the figure) of the D-cut surface 84b in the direction orthogonal to the axial direction of the rotation shaft 84a of the gear 84 is connected to one end of the inner wall flat portion 83c of the engagement hole 83b of the rotor 83a. (The right end in the drawing), while the other end of the D-cut surface 84b is separated from the other end of the inner wall flat portion 83c. This contact state is different from the state where the D-cut surface 84b and the inner wall flat portion 83c are parallel to each other when the gear 84 rotates relative to the rotor 83a by an angle of -θ °. Take.

  Also, this time, when the side fences 74A and 74B are moved in a direction to narrow the distance between each other, as shown in FIG. 5C, the rotation shaft 84a of the gear 84 is rotated clockwise in FIG. The rotor 83a rotates relative to the engagement hole 83b of the rotor 83a by the gap C. As a result, the other end (the left end in the figure) of the D-cut surface 84b in the direction orthogonal to the axial direction of the rotation shaft 84a of the gear 84 is connected to the inner wall flat portion 83c of the engagement hole 83b of the rotor 83a. While being in contact with the end side (the left end in the figure), one end of the D-cut surface 84b and one end of the inner wall flat portion 83c are separated from each other. In this contact state, the gear 84 takes a rotational position relatively rotated by an angle of + θ ° with respect to the rotor 83a, as compared with a state in which the D-cut surface 84b and the inner wall flat portion 83c are parallel to each other. .

  As a result, even if the positions of the side fences 74A and 74B are the same, the angle detected by the rotary sensor 83 may fluctuate within an angle range of 2θ °. In particular, there is a maximum difference of 2θ ° between the case where the side fences 74A and 74B are moved in the direction in which the distance between them is increased and the case where the side fences 74B are moved in the direction in which the side fences are narrowed. Therefore, the rotation amount (rotation angle) of the gear 84 cannot be accurately obtained from the detection result (rotation amount of the rotor 83a) by the rotary sensor 83, and the positions of the side fences 74A and 74B cannot be accurately grasped. Therefore, for example, when the width direction size of the sheet S is determined from the detection result of the rotary sensor 83 (the rotation amount of the rotor 83a), the determination cannot be performed appropriately.

FIG. 6 is an explanatory diagram showing a connection structure between the rotation shaft 84a of the gear 84 and the engagement hole 83b of the rotor 83a in the present embodiment.
In the present embodiment, between the gear 84 and the rotor 83a, the contact state between the D-cut surface 84b of the rotating shaft 84a of the gear 84 and the inner wall flat portion 83c of the engagement hole 83b of the rotor 83a is maintained. A spring 85 is provided as an urging member for applying an urging force in the rotation direction to the motor.

  In this embodiment, in order to mount the spring 85 inside the engagement hole 83b of the rotor 83a, a notch is provided in the rotating shaft 84a of the gear 84, a part of the D cut surface 84b is removed, and a space for mounting the spring 85 is provided. G is formed.

  The urging member is not particularly limited as long as it can apply the above urging force. The urging member of the present embodiment is attached inside the engagement hole 83b of the rotor 83a, but the installation location is not limited to this.

  The spring 85 of the present embodiment applies an urging force in the direction indicated by the symbol F in FIG. 6, and is provided at one end of the D-cut surface 84b in the direction perpendicular to the axial direction of the rotating shaft 84a (the right end in the drawing). Part) is urged in a direction away from the inner wall flat part 83c of the engagement hole 83b. With this urging force, the contact state between the D-cut surface 84b and the inner wall flat portion 83c of the engagement hole 83b is always maintained in the contact state (one-sided state) shown in FIG. 5C.

  Since the biasing force of the spring 85 is set to be equal to or greater than the rotational torque of the rotor 83a, even when the rotation shaft 84a of the gear 84 rotates counterclockwise in the figure as shown in FIG. The contact state between the D-cut surface 84b and the inner wall flat portion 83c of the engagement hole 83b is maintained at the contact state shown in FIG. 5C, and the gear 84 and the rotor 83a rotating in that state are integrated. To rotate. Therefore, even if there is a gap C between the D-cut surface 84b of the rotating shaft 84a and the inner wall flat portion 83c of the engagement hole 83b, the contact between the D-cut surface 84b and the inner wall flat portion 83c of the engagement hole 83b. The contact state is uniquely determined, and the rotation amount (rotation angle) of the gear 84 can be accurately obtained from the detection result of the rotary sensor 83 (rotation amount of the rotor 83a). As a result, the position of the side fences 74A and 74B can be accurately grasped from the detection result of the rotary sensor 83 (the rotation amount of the rotor 83a). When determining the size, the determination can be made appropriately.

  On the other hand, the urging force of the spring 85 in the present embodiment is set to be less than the allowable damage pressure of the rotor 83a. Therefore, when the gear 84 is assembled to the rotor 83a, an excessive external force exceeding the damage allowable pressure of the rotor 83a is not applied, and the rotary sensor 83 is less likely to be broken or broken.

  Further, in the present embodiment, it is allowed that the gap C exists between the D-cut surface 84b of the rotating shaft 84a and the inner wall flat portion 83c of the engagement hole 83b of the rotor 83a. Therefore, it is not necessary to adopt a connection structure in which the rotary shaft 84a of the gear 84 is press-fitted into the engagement hole 83b of the rotor 83a, and no excessive external force is applied to the rotary sensor 83 by press-fitting. There is little worry about failure or damage of the sensor 83.

Next, the configuration of the spring 85 will be further described.
FIG. 7 is a perspective view showing a state in which the rotation shaft 84a of the gear 84 is fitted into the engagement hole 83b of the rotor 83a of the rotary sensor 83, and the spring 85 is not yet attached.
The spring 85 of the present embodiment applies an urging force by a restoring force against deformation of a wire made of metal or the like. Specifically, as shown in FIG. 7, when the wire rod has one or more bent portions 85a, 85b, and 85c, and the bent portions 85a, 85b, and 85c are deformed in the closing direction or the opening direction. The urging force is applied by the restoring force of. The bent portions 85a, 85b, 85c have an R shape in order to avoid stress concentration during elastic deformation.

  In addition, one end of a wire constituting the spring 85 of the present embodiment is provided with a grip portion 86 for an operator to grip when assembling the spring 85, and the other end is a free end. In the present embodiment, the outer shape of the grip portion 86 is circular so that the operator can easily hold it. If the outer shape is a circular shape, a disk member or a ring member may be used. The outer shape of the grip portion 86 is not limited to a circular shape, but may be another outer shape.

FIG. 8A is an explanatory diagram showing the shape of the spring 85 before assembly, and FIG. 8B is an explanatory diagram showing the shape of the spring 85 after assembly.
When assembling the spring 85, the operator grips the grip portion 86 of the spring 85 so as to sandwich the grip portion between two fingers. Then, the operator moves the spring 85 in the direction of the center axis of the grip portion 86 (vertical direction in the figure), and the bent end portion 85a of the spring 85 is formed by the notch of the rotating shaft 84a of the gear 84. The rotor 83a is inserted into the space G in the engagement hole 83b of the rotating shaft 84a from the axial direction of the rotating shaft 84a as shown by an arrow B in FIG. The spring 85 is inserted from the axial end surface of the gear 84 on the end surface side opposite to the side facing the rotary sensor 83.

  Here, the first straight portion 85d between the first bent portion 85b of the spring 85 and the fixed end of the wire (the end of the wire to which the grip 86 is attached) is substantially parallel to the center axis direction of the circular grip 86. Extends to. Therefore, when the spring 85 is inserted, the first straight portion 85d advances straight along the surface of the rotation shaft 84a forming the space G in the rotation direction of the rotation shaft 84a. On the other hand, as shown in FIG. 8A, the second straight portion 85e between the second bent portion 85c of the spring 85 and the free end of the wire (the end opposite to the fixed end of the wire) forms a spring. The extension 85 extends in a direction inclining away from the first linear portion 85d with respect to the center axis direction of the grip portion 86 so that the entire shape of the 85 is substantially V-shaped. Therefore, when the spring 85 is inserted, the second linear portion 85e abuts on the inner wall flat portion 83c of the rotor 83a forming the space G in the rotation direction of the rotation shaft 84a. As a result, the spring 85 is elastically deformed so that the second straight portion 85e approaches the first straight portion 85d.

  Further, with this elastic deformation, the distal bent portion 85a of the spring 85 moves to a position where it goes around the back side of the rotor 83a (the distal end side in the spring insertion direction). As a result, as shown in FIG. 8B, the spring 85 has the distal bent portion 85a positioned outside the space G in a plane direction (horizontal direction in the drawing) orthogonal to the axial direction of the rotating shaft 84a. It is held in a posture. As a result, the third linear portion 85f between the distal bent portion 85a and the second bent portion 85c is hooked on the back side of the rotor 83a, so that the spring 85 does not easily fall out of the space G.

  The above configuration is realized by the shape of the spring 85 of the present embodiment. That is, as shown in FIG. 8A, the shape of the spring 85 of the present embodiment before assembly is such that the first straight portion 85d and the third straight portion 85f are substantially parallel to the center axis direction of the circular grip portion 86. Extends to. The distance D2 between the first straight portion 85d and the third straight portion 85f is set smaller than the space D1 of the space G. The assembled shape of the spring 85 of the present embodiment is, as shown in FIG. 8B, the maximum interval between the spring portions wrapping around the back side of the rotor 83a, that is, the first linear portion 85d and the distal bent portion 85a. Is set wider than the space D1 of the space G.

FIG. 9 is a perspective view, partially in section, showing a state in which the rotation shaft 84a of the gear 84 is fitted into the engagement hole 83b of the rotor 83a of the rotary sensor 83 and the spring 85 is attached.
Note that the cross section shown in FIG. 9 is a cross section taken along line WW in FIG.

FIG. 10 is a perspective view showing the gear 84 alone.
FIG. 11 is an enlarged view of a portion of the gear 84 provided with an eave portion 87 for preventing the spring 85 from separating from the space G.
FIG. 12 is a perspective view showing the gear shown in FIG. 11 in a partial cross section.
In the present embodiment, an eave portion 87 is provided as a detachment preventing member that prevents the spring 85 attached to the space G from detaching from the space G. The eave portion 87 is provided on the end surface of the gear 84 in the axial direction on the side where the spring 85 is inserted, that is, on the end surface opposite to the side facing the rotary sensor 83. The eave portion 87 has one end fixed to the axial end surface of the gear 84 and the other end protruding toward the rotation shaft 84 a of the gear 84. The spring 85 is inserted into the space G via a spring receiving opening G ′ provided in the gear 84. When the spring 85 is inserted into the space G, the protruding portion of the eaves portion 87 abuts on the grip portion 86 of the spring 85 from the rear side in the insertion direction, thereby preventing the spring 85 from being detached from the space G. . When the spring 85 is inserted, the grip portion 86 can be elastically deformed with a finger so that the protruding portion of the eave portion 87 can be overcome.

  In this embodiment, the connection between the rotor 83a of the rotary sensor 83 and the gear 84 is performed by setting the rotation shaft 84a of the gear 84 as a D-cut shaft and the engaging hole 83b of the rotor 83a as a D-cut shape. And 84 rotate integrally. At this time, as shown in FIG. 13B, when the length x of the D-cut surface 84b becomes X / 2 or less in a cross section orthogonal to the axial direction of the rotation shaft 84a of the gear 84, the rotor 83a and the gear 84 Cannot rotate together. Therefore, the length x of the D-cut surface 84b is set such that the rotor 83a and the gear 84 can rotate integrally, as shown in FIG.

FIG. 14 is a perspective view of the rotary sensor 83 with the gear 84 removed.
FIG. 15 is a perspective view showing a state where the rotary sensor 83 is removed from the base 72C of the manual feed tray 72.
FIG. 16 is a plan view of the rotary sensor 83 with the gear 84 removed.
FIG. 17 is a perspective view showing a partial cross section of the rotary sensor 83 to which the gear 84 is attached and the periphery thereof.
FIG. 18 is a cross-sectional view of the vicinity of the meshing portion between the gear 84 and the rack 81A.

  The rotary sensor 83 of this embodiment is mounted on a sensor board 88 installed on a base 72C of the manual feed tray 72. The sensor substrate 88 is positioned on the base 72C by the positioning main reference boss 89a and the positioning slave reference boss 89b on the base 72C.

  Here, when the side fence 74A moves, the gear 84 that meshes with the rack 81A that moves in conjunction with the side fence 74A flaps. If the degree of the flapping (displacement of the gear 84) is large, the engagement between the rack 81A and the gear 84 is disengaged, the correspondence between the side fence 74A and the rotation amount of the rotor 83a to which the gear 84 is attached is lost, and The size in the width direction of the sheet S set on the tray 72 cannot be properly determined.

  Therefore, on the base 72C of this embodiment, as shown in FIG. 15, apart from the positioning bosses 89a and 89b of the sensor substrate 88, fluttering for suppressing fluttering of the gear 84 (displacement of the gear 84). Suppression bosses 89c, 89d, 89e, 89f are provided. As shown in FIGS. 14 and 16, the sensor board 88 is provided with holes and cutouts corresponding to the flapping suppressing bosses 89c, 89d, 89e, 89f.

  The sensor board 88 on which the gear 84 is fixed is mounted by mounting the sensor board 88 on the base 72C so that the holes and cutouts of the sensor board 88 engage with the flapping suppressing bosses 89c, 89d, 89e, 89f. Displacement (flutter) is regulated. As a result, fluttering of the gear 84 during movement of the side fence 74A is suppressed.

[Modification 1]
Next, a modified example of the spring according to the present embodiment (hereinafter, this modified example is referred to as “modified example 1”) will be described.
In the spring 85 of the above-described embodiment, when the spring 85 is inserted into the space G formed by providing a notch in the rotation shaft 84a of the gear 84, as shown in FIG. The spring 85 is elastically deformed such that the second straight portion 85e approaches the first straight portion 85d while coming into contact with the entrance edge 83d of the space G. At this time, the second linear portion 85e of the spring 85 receives a resistance E against a restoring force (elastic force) of the elastic deformation of the spring 85 from the entrance edge 83d of the space G as shown in FIG. Since this reaction force E has a component force Ea in the direction opposite to the insertion direction of the spring 85 (upper side in FIG. 19), it acts to cause the spring 85 to escape from the space G. For this reason, when the spring 85 is inserted (assembled), a problem may occur that the spring 85 jumps out of the space G and escapes due to the elastic force of the spring 85.

  Also, if the spring 85 is assembled with insufficient insertion, the spring 85 is displaced in the direction of coming out of the space G due to the elastic force of the spring 85 after the assembly, and the rotation between the gear 84 and the rotor 83a in the rotational direction. There is a possibility that a sufficient urging force cannot be applied.

  FIG. 20A is an explanatory diagram showing the shape of the spring 185 before the assembling in the first modification, and FIG. 20B is an explanatory diagram showing the state of the spring 185 during the assembling. FIG. 20C is an explanatory diagram illustrating the shape of the spring 185 after assembly.

  In the first modification, as shown in FIG. 20A, the operator inserts the distal bent portion 85a of the spring 185 into the space G of the rotor 83a. Here, the spring 185 of the first modification includes a fourth linear portion 85f1 and a fifth linear portion 85f between the distal bent portion 85a and the second bent portion 85c instead of the third linear portion 85f of the above-described embodiment. A straight portion 85f2 and a third bent portion 85f3 connecting them are provided. As a result, before the second straight portion 85e comes into contact with the entrance edge 83d of the space G of the rotor 83a and receives the drag E against the restoring force (elastic force) of the elastic deformation of the spring 185, as shown in FIG. As shown, the distal bent portion 85a of the spring 185 can exceed the outlet edge 83e of the space G.

  As described above, when the spring 185 of the first modification receives the reaction force E against the restoring force (elastic force) of the elastic deformation of the spring 185, the distal bent portion 85a of the spring 185 already has the exit edge 83e of the space G. Will be exceeded. Therefore, at this time, the fourth linear portion 85f1 is inserted into the space G by operating the gripping portion 86 so as to rotate in the direction of arrow H in FIG. The spring 185 can be elastically deformed such that the second linear portion 85e approaches the first linear portion 85d while being hooked on the back side. Therefore, even if the spring 185 receives the reaction force E having a component force Ea in the direction opposite to the insertion direction, the situation where the spring 185 jumps out of the space G and slips out due to the hook of the fourth linear portion 85f1 is suppressed. be able to.

[Modification 2]
Next, a modified example of the grip portion in the present embodiment (hereinafter, this modified example is referred to as “modified example 2”) will be described.
FIG. 21 is a perspective view showing the grip 186 according to the second modification. In addition, FIG. 21 is a perspective view showing a state in which the rotation shaft 84a of the gear 84 is fitted into the engagement hole 83b of the rotor 83a of the rotary sensor 83 and the spring 85 is attached, similarly to FIG. It is.

  The grip portion 86 of the above-described embodiment is formed by a member different from the spring 85, but in the second modification, one end of a wire forming the spring 85 is formed into a coil by winding. . Accordingly, the number of components is reduced as compared with the case where the gripping portion is formed of a member separate from the spring 85, which is advantageous for cost reduction.

  However, in the second modification, since the grip portion 186 is formed by winding one end of the wire constituting the spring 85 into a coil shape, the following problem is likely to occur. In other words, even after the assembly, the second straight portion 85e of the spring 85 receives the reaction force E against the restoring force (elastic force) of the elastic deformation of the spring 85 from the entrance edge 83d of the space G, and the spring 85 comes out of the space G. Forces deviating in the direction may act.

  Normally, even when such a force is applied, the force by which the third linear portion 85f of the spring 85 is hooked on the back side of the rotor 83a and the force by which the protruding portion of the eave portion 87 presses against the grip portion 186 of the spring 85 are generated. The spring 85 is prevented from falling out of the space G. However, in the case of using the grip portion 186 formed by winding one end of a wire constituting the spring 85 and forming a coil, if a force is applied to the spring 85 in a direction of coming out of the space G after assembly, the spring 85 The connecting portion 85g between the gripper 186 and the gripper 186 is lifted up, and as shown in FIG. 22, the winding direction of the wire forming the gripper 186 may be reversed. In such a state, even if the protruding portion of the eaves portion 87 presses the grip portion 186 of the spring 85, the spring 85 moves in the direction of coming out of the space G by the amount by which the connecting portion 85g is lifted. Of the third linear portion 85f on the back side of the rotor 83a is insufficient. As a result, there is a possibility that a sufficient urging force in the rotational direction cannot be applied between the gear 84 and the rotor 83a.

  Further, when the third linear portion 85f of the spring 85 is not sufficiently caught on the back side of the rotor 83a, the gear 84 is disengaged from the engagement hole 83b of the rotor 83a of the rotary sensor 83 on the rotating shaft 84a of the gear 84. It becomes easy to move in the direction. As a result, if the gear 84 that meshes with the rack 81A that moves in conjunction with the side fence 74A fluctuates during the movement of the side fence 74A, the gear 84 and the rack 81A may be disengaged.

  Therefore, when the grip portion 186 formed by winding one end of the wire constituting the spring 85 into a coil shape is used as in the second modification, the shape of the spring 185 shown in the first modification is employed. May be. That is, at the point of receiving the reaction force E against the restoring force (elastic force) of the elastic deformation of the spring 185, the distal bent portion 85a of the spring 185 is configured to already exceed the outlet edge 83e of the space G. According to this, even if the fourth linear portion 85f1 of the spring 185 is hooked on the back side of the rotor 83a even when the drag E is applied to the restoring force (elastic force) of the elastic deformation of the spring 185, the spring 85 and the grip portion 186 are provided. There is no possibility that the connecting portion 85g is lifted up, and the winding direction of the wire forming the grip portion 186 is not reversed. Therefore, even when the gear 84 that meshes with the rack 81A that moves in conjunction with the side fence 74A fluctuates when the side fence 74A moves, it is possible to prevent the gear 84 from disengaging from the rack 81A.

  As described above, in the present embodiment (including the modified examples, the same applies hereinafter), the configuration in which the two side fences 74A and 74B move in conjunction with each other has been described, but in the configuration in which the two side fences 74A and 74B move independently of each other. However, the present invention is similarly applicable to a configuration in which only one of the side fences 74A and 74B moves.

  Also, the present embodiment has been described with reference to the case where the present invention is applied to the side fences 74A and 74B which come into contact with and separate from the sheet edge along the sheet width direction orthogonal to the sheet transport direction. The present invention may be applied to an end fence that comes into contact with and separates from a part.

  Further, in the present embodiment, the gear 84 side is a D-cut shaft, and the rotor 83a side is a D-cut shaped engagement hole. Conversely, the rotor 83a side is a D-cut shaft, The gear 84 may be formed as an engagement hole having a D-cut shape.

  In the present embodiment, the manual tray 72 has been described. However, as long as it holds sheets, the sheet storage unit, the discharge stack unit 39, and the sheet stacking unit 61 in the sheet separating device 61 of the sheet feeding device 4 are not limited to the manual tray 72. The present invention is also applicable to a mounting table of the automatic document feeder 5 and the like.

What has been described above is merely an example, and each embodiment has a specific effect [first embodiment].
In the first mode, a regulating member (for example, side fences 74A and 74B) that can move in a direction of coming and going with respect to an end of a sheet (for example, the sheet S), and a rotating member that rotates according to the movement of the regulating member ( For example, a gear 84), a detected member (for example, a rotor 83a) attached to the rotating member and integrally rotating, and a rotational position detecting means (for example, a rotary sensor 83) for detecting a rotational position of the detected member. A sheet holding device (e.g., a manual tray 72) provided with a contact portion (e.g., a D-cut surface 84b) of the rotating member with respect to a contacted portion (e.g., an inner wall flat portion 83c) of the detected member. The detected member rotates integrally with the rotating member by abutting from the rotating direction of the rotating member, and an additional member for maintaining a contact state between the abutting portion and the abutted portion is provided. The force F, is characterized in that it has a biasing member (e.g., spring 85) to be applied to between the detection target member and the rotating member.
In general, the connection between the rotating member and the detected member is performed by setting a shaft provided on one of the rotating member and the detected member as a D-cut shaft and engaging with the D-cut surface (abutting portion or abutted portion). In many cases, a structure in which the other hole has a D-cut shape so as to form a mating inner wall surface (contacted portion or contact portion) is adopted. However, in this structure, a gap C may be generated between the D-cut surface and the inner wall surface of the hole due to the dimensional variation of the D-cut shape hole and the D-cut shaft fitted into the hole. If such a gap exists, the relationship between the rotation angle of the rotating member and the rotation angle of the detected member is not uniquely determined, and the rotation angle of the rotating member cannot be accurately obtained from the rotation angle of the detected member. As a result, the position of the regulating member cannot be accurately grasped, and the sheet size cannot be determined properly.
In this aspect, the contact state between the contact part of the rotating member and the contact part of the detected member is maintained by the urging force applied by the urging member. Thereby, even if there is a gap C between the contact part of the rotating member and the contacted part of the detected member, the contact between the contact part of the rotating member and the contacted part of the detected member is maintained. As a result of maintaining the state, the relationship between the rotation angle of the rotating member and the rotation angle of the detected member is uniquely determined. Therefore, the rotation angle of the rotating member can be detected with high accuracy, and the position of the regulating member can also be detected with high accuracy. Therefore, for example, when detecting the size of the sheet according to the position of the regulating member, the size of the sheet can be accurately detected.
Moreover, in this aspect, even if there is a gap between the abutting portion of the rotating member and the abutted portion of the detected member, the rotation angle of the rotating member can be accurately detected. There is no need to employ a connection structure that press-fits the member and the detected member. In such a press-fitting connection structure, at the time of press-fitting, excessive external force is applied to the rotational position detecting means via the detected member, and there is a concern that the rotational position detecting means may be broken or damaged. Eliminate such concerns.

[Second aspect]
According to a second aspect, in the first aspect, there is provided a rotating shaft 84a provided on one of the rotating member and the detected member, and an engaging hole 83b provided on the other to engage with the rotating shaft. One of the contact portion and the contacted portion is formed on the peripheral surface of the rotating shaft, and the other is formed on the inner wall surface of the engagement hole, and the urging member is mounted inside the engagement hole. It is characterized by being able to.
According to this, since the urging member is attached inside the engagement hole, the urging member is unlikely to be in the way.

[Third aspect]
According to a third aspect, in the second aspect, the rotation shaft is a D-cut shaft, and the abutting portion or the abutted portion formed on a peripheral surface of the rotation shaft is a D-cut surface of the D-cut shaft. 84b, wherein the abutted portion or the abutting portion formed on the inner wall surface of the engagement hole is an engagement surface (for example, an inner wall flat portion 83c) that engages with the D-cut surface. It is assumed that.
According to this, in a commonly used coupling structure using a D-cut shaft, there is no fear of failure or breakage of the rotational position detecting means due to press fitting, and the rotational angle of the rotating member can be accurately determined based on the detection result of the rotational position detecting means. We can detect well.

[Fourth aspect]
In a fourth aspect, in the third aspect, the biasing member biases one end of the D-cut surface in a direction orthogonal to the axial direction of the rotation shaft in a direction away from the engagement surface. It is assumed that.
According to this, the contact state between the contacting part of the rotating member and the contacted part of the detected member is always maintained in a state of being biased, and the contact state can be maintained with a simple configuration.

[Fifth aspect]
According to a fifth aspect, in the fourth aspect, the urging member is a spring member (for example, a spring 85) that applies the urging force by a restoring force against deformation of the wire.
According to this, it is easy to install the urging member even in a narrow space.

[Sixth aspect]
According to a sixth aspect, in the fifth aspect, the spring member has one or more bent portions 85a, 85b, and 85c obtained by bending the wire, and deforms the bent portion in a closing direction or an opening direction. The urging force is applied by a restoring force when the urging force is applied.
According to this, an urging member that can be easily installed in a narrow space can be realized with a simple configuration.

[Seventh aspect]
According to a seventh aspect, in the sixth aspect, the spring member is attached such that at least one of the bent portions (for example, the bent end portion 85a) penetrates the engagement hole, and the bent portion is the rotation shaft. In a plane direction orthogonal to the axial direction of the above.
According to this, the spring member inserted into the engagement hole can be hooked on the edge of the engagement hole, so that the spring member cannot be easily removed from the engagement hole.

[Eighth aspect]
According to an eighth aspect, in the seventh aspect, the spring member inserts the bent portion into the engagement hole when the spring member is attached, and the bent portion is formed at the time when the urging force is generated by the spring member. Has a shape passing through the engagement hole.
According to this, it is possible to prevent the spring member inserted into the engagement hole from easily falling out of the engagement hole.

[Ninth aspect]
According to a ninth aspect, in any one of the second to eighth aspects, there is provided a detachment preventing member (for example, an eave portion 87) for preventing a biasing member attached to the engagement hole from detaching from the engagement hole. It is characterized by the following.
According to this, it is possible to prevent the spring member inserted into the engagement hole from easily falling out of the engagement hole.

[Tenth aspect]
According to a tenth aspect, in any one of the first to ninth aspects, the urging member has a grip portion 86.
According to this, the handling of the urging member by the operator becomes easy.

[Eleventh aspect]
According to an eleventh aspect, in the tenth aspect, the outer shape of the grip portion is circular.
According to this, the operator can easily grip the grip portion.

[Twelfth aspect]
A twelfth aspect is a sheet feeding device (for example, a manual sheet feeding device 70 or a sheet feeding device 4) for feeding a sheet held by a sheet holding device, wherein the sheet holding device is a first to an eleventh aspect. Characterized in that any one of the sheet holding devices is used.
According to this, it is possible to provide a sheet feeding device including a sheet holding device capable of accurately detecting the rotation angle of the rotation member from the detection result of the rotation position detection unit.

[Thirteenth aspect]
A thirteenth aspect is an image forming apparatus (for example, a copying machine 1) including a sheet holding device, wherein the sheet holding device according to any one of the first to eleventh aspects is used as the sheet holding device. Is what you do.
According to this, it is possible to provide an image forming apparatus including a sheet holding device capable of accurately detecting the rotation angle of the rotation member from the detection result of the rotation position detection unit.

1: Image forming apparatus 2: Image forming apparatus main body 3: Image reading apparatus 4: Paper feeder 5: Automatic document feeder 70: Manual feeder 71: Opening / closing members 71A, 72B: Rotating fulcrum 72: Manual feed tray 72B: Sheet loading surface 72C: base 73: link members 74A, 74B: side fence 75: guide rails 81A, 81B: rack 82: pinion 83: rotary sensor 83a: rotor 83b: engagement hole 83c: inner wall flat portion 83d: entrance edge Part 83e: Exit edge part 84: Gear 84a: Rotating shaft 84b: D-cut surface 85, 185: Spring 85a: Tip bent part 85b: First bent part 85c: Second bent part 85d: First straight part
85e: second straight portion 85f: third straight portion 85f1: fourth straight portion 85f2: fifth straight portion 85f3: third bent portion 85g: connecting portions 86, 186: gripping portion 87: eaves portion 88: sensor substrate 89a: Positioning main reference boss 89b: Positioning slave reference boss 89c, 89d, 89e, 89f: Flap suppressing boss.

JP 2015-113198 A

Claims (13)

A regulating member movable in a direction of coming and going with respect to an end of the sheet,
A rotating member that rotates in accordance with the movement of the regulating member,
A detected member attached to the rotating member and integrally rotating,
A rotation position detection means for detecting a rotation position of the detected member, a sheet holding device,
With the configuration in which the abutting portion of the rotating member abuts against the abutting portion of the detected member from the rotating direction of the rotating member, the detected member rotates integrally with the rotating member. Yes,
A sheet holding device comprising: a biasing member that applies a biasing force for maintaining a contact state between the contact portion and the contacted portion between the rotation member and the detected member. The sheet holding device according to claim 1,
A rotating shaft provided on one of the rotating member and the detected member, and an engaging hole provided on the other to engage with the rotating shaft,
One of the contact portion and the contacted portion is formed on a peripheral surface of the rotation shaft, and the other is formed on an inner wall surface of the engagement hole,
The sheet holding device, wherein the urging member is attached inside the engagement hole. The sheet holding device according to claim 2,
The rotation axis is a D-cut axis,
The abutting portion or the abutted portion formed on the peripheral surface of the rotating shaft is a D-cut surface of the D-cut shaft, and the abutting portion or the abutting portion formed on an inner wall surface of the engagement hole. The said contact part is an engagement surface which engages with this D cut surface, The sheet holding apparatus characterized by the above-mentioned. The sheet holding device according to claim 3,
The sheet holding device, wherein the urging member urges one end of the D-cut surface in a direction orthogonal to an axial direction of the rotation shaft in a direction away from the engagement surface. The sheet holding device according to claim 4,
The urging member is a spring member that applies the urging force by a restoring force against deformation of the wire rod. The sheet holding device according to claim 5,
The spring member has one or more bent portions obtained by bending the wire, and applies the urging force by a restoring force when the bent portion is deformed in a closing direction or an opening direction. Sheet holding device. The sheet holding device according to claim 6,
The spring member is attached so that at least one of the bent portions penetrates the engagement hole, and the bent portion is larger than the engagement hole in a surface direction orthogonal to an axial direction of the rotation shaft. A sheet holding device which is held in a posture located outside. The sheet holding device according to claim 7,
The spring member inserts the bent portion into the engagement hole when attaching the spring member, and the bent portion passes through the engagement hole when the urging force is generated by the spring member. A sheet holding device having a shape. The sheet holding device according to any one of claims 2 to 8,
A sheet holding device comprising: a detachment preventing member that prevents a biasing member attached to the engagement hole from detaching from the engagement hole. The sheet holding device according to any one of claims 1 to 9,
A sheet holding device, wherein the urging member has a grip portion. The sheet holding device according to claim 10,
An outer shape of the grip portion is a circular shape. A sheet feeding device for feeding a sheet held by a sheet holding device,
A sheet feeding device using the sheet holding device according to any one of claims 1 to 11 as the sheet holding device. An image forming apparatus having a sheet holding device,
An image forming apparatus using the sheet holding device according to claim 1 as the sheet holding device.

Images