JP6270466B2 - Sheet conveying apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet conveying apparatus and an image forming apparatus that convey a sheet from upstream to downstream.

  2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine, a facsimile, or a printer is known that includes a sheet conveying device that switches a sheet conveying path. As a conventional sheet conveying apparatus, face-down discharge (FD discharge) for discharging a sheet with the printing surface of the sheet facing down, face-up discharge (FU discharge) for discharging the sheet with the printing surface of the sheet facing up, Those that switch are known. And the conventional sheet conveying apparatus discharges a sheet to a different discharge part.

  As a conventional sheet conveying apparatus, there is known a sheet conveying apparatus that reverses a sheet by switching a conveying path in order to print on both sides of the sheet. Conventionally, as a switching means for switching the transport path, there is a method of switching the transport path by rotating a flapper pivotally supported by a rotation shaft at a branch portion of the transport path.

  Here, the flapper needs to be rotated with a sufficient rotation angle in the switching operation so as not to cause a sheet conveyance failure. On the other hand, in the image forming apparatus, it is necessary to shorten the time required for switching the conveyance path (including the settling time) to increase the processing speed and reduce the power consumption required for the processing to reduce the cost. The time required for switching the transport path can be shortened by reducing the rotation angle when switching the transport path as much as possible to improve the responsiveness.

  In such a situation, Patent Document 1 discloses that a flexible sheet material is provided at the front end of the flapper so that it takes time to operate the flapper and the flexible sheet is in contact with the front end of the flapper and the front end of the sheet. Disclosed is a sheet conveying apparatus that avoids sheet conveyance failure due to the elasticity of the material.

JP-A-8-81105

  However, in Patent Document 1, when the sheet is stopped while being in contact with the flexible sheet at the time of jam processing, the flexible sheet may be deformed when the sheet is taken out. Further, the flexible sheet is easily worn. Therefore, Patent Document 1 has a problem that it is difficult to ensure reliability such as durability. Moreover, in patent document 1, since it is necessary to change the elastic force of a flexible sheet according to the elastic force of a sheet | seat, it has the subject that it is difficult to respond | correspond to the various sheet | seats from which an elastic force differs. Furthermore, Patent Document 1 has a problem that the time required for switching the transport path cannot be shortened.

  The object of the present invention is to improve the responsiveness when switching the conveyance path to increase the speed and reduce the cost, thereby eliminating the need for a flexible sheet, corresponding to various sheets and having high reliability. It is to provide a sheet conveying device and an image forming apparatus to be secured.

A sheet conveying apparatus according to the present invention is a sheet conveying apparatus that conveys a sheet from upstream to downstream, and branches an upstream conveying path for conveying the sheet and a sheet conveyed from the upstream conveying path to the downstream. A plurality of branch conveyance paths for conveyance; a first stop position that contacts a first contact surface of the upstream conveyance path to guide a sheet to a predetermined branch conveyance path; and a second one of the upstream conveyance path The sheet is supported so as to be rotatable between a second stop position that contacts the contact surface of the sheet and guides the sheet to a branch conveyance path different from the predetermined branch conveyance path, and the sheet is conveyed by the rotation. The switching member includes a switching member having a toggle mechanism that switches a branch conveyance path and exceeds a dead point at the time of the rotation, and a rotatable drive shaft having an engagement portion, and the switching member has the engagement A dead point of the toggle mechanism. Until it exceeds, the engaging portion and the engaged portion are engaged to rotate together with the drive shaft, and the drive shaft has the switching member at the first stop position and the second stop position. It rotates at an angle smaller than the angle at the time of rotating between .

  According to the present invention, it is possible to improve the responsiveness at the time of switching the conveyance path, to increase the speed and to reduce the cost, and in accordance with this, it is possible to eliminate the need for a flexible sheet. It is possible to cope with it and to ensure high reliability.

Sectional drawing of the image forming apparatus which concerns on 1st Embodiment of this invention. Sectional drawing of the sheet conveying apparatus which concerns on 1st Embodiment of this invention. 1 is a perspective view of a sheet conveying apparatus according to a first embodiment of the present invention. The perspective view which fractured | ruptured a part of sheet conveying apparatus which concerns on 1st Embodiment of this invention. Sectional drawing of the principal part of the sheet conveying apparatus which concerns on 1st Embodiment of this invention. Schematic diagram of a sheet conveying apparatus according to the first embodiment of the present invention. Sectional drawing of the principal part of the sheet conveying apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing of the principal part of the sheet conveying apparatus which concerns on 3rd Embodiment of this invention. Sectional drawing of the principal part of the sheet conveying apparatus which concerns on 4th Embodiment of this invention.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

[First Embodiment]
<Overall configuration of image forming apparatus>
The overall configuration of the image forming apparatus 100 according to the first embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

  The image forming apparatus 100 includes a photosensitive member 1, a scanner unit 10, a laser scanner 11, an intermediate transfer belt unit 20, an intermediate transfer belt 21, a driving roller 22, a feeding roller 31, a retard roller 32, Conveyance roller 33, fixing unit 40, conveyance unit 50, secondary transfer roller 51, conveyance roller 52, discharge roller 53, FD discharge roller 54, FU discharge tray 55, FD tray 56, and flapper 57.

  The photosensitive member 1 is exposed by laser light emitted from each laser scanner 11 (11Y, 11M, 11C, 11Bk), and is developed by applying toner to form a developer image on the surface.

  The laser scanner 11 exposes the photoreceptor 1 by irradiating the surface of the photoreceptor 1 with laser light.

  The intermediate transfer belt 21 primarily transfers the developer image from the photoreceptor 1.

  The drive roller 22 rotates in the clockwise direction in FIG. 1, thereby rotating the intermediate transfer belt 21 in the clockwise direction in FIG.

  The feeding roller 31 feeds the sheet P.

  The retard roller 32 conveys the sheet P fed by the feeding roller 31.

  The conveyance roller 33 conveys the sheet P conveyed by the retard roller 32.

  The fixing unit 40 heats and presses the sheet P to which the developer image has been transferred, and fixes the developer image transferred to the sheet P by the secondary transfer roller 51 to the sheet P.

  The secondary transfer roller 51 secondarily transfers the developer image primarily transferred to the intermediate transfer belt 21 onto the sheet P conveyed by the conveyance roller 33.

  The conveyance roller 52 conveys the sheet P to the upper part of the image forming apparatus 100.

  The FU discharge roller 53 discharges the sheet P that has passed under the flapper 57 to the FU discharge tray 55.

  The FD discharge roller 54 discharges the sheet P conveyed by the conveyance roller 52 to the FD tray 56.

  A flapper 57 serving as a switching member switches a conveyance path of a sheet conveyed from upstream to downstream. Specifically, the flapper 57 includes a conveyance path for conveying the sheet P conveyed from the fixing unit 40 to the FU discharge roller 53 and a conveyance path for conveying the sheet P conveyed from the fixing unit 40 to the conveyance roller 52. Switch.

<Configuration of sheet conveying device>
The configuration of the sheet conveying apparatus 150 according to the first embodiment of the present invention will be described in detail below with reference to FIGS.

  FIG. 3 shows the sheet conveying apparatus 150 with the guide portion 68 removed. 5A is a diagram in which the flapper 57 is switched so as to convey the sheet to the branch conveyance path 71 for FD discharge, and FIG. 5B is a branch conveyance for FU discharge. FIG. 6 is a diagram in which a flapper 57 is switched so as to convey a sheet to a path 70.

  The sheet conveying apparatus 150 of the present embodiment includes a flapper 57, a solenoid 61, a leaf spring 63, a drive shaft 65, an upstream conveying path 69, a branch conveying path 70, and a branch conveying path 71. . The sheet conveying device 150 conveys the sheet from upstream to downstream.

  A plurality of flappers 57 are rotatably provided on the drive shaft 65, and are rotated by the drive shaft 65 to form a branch conveyance path 70 in a predetermined direction and a branch conveyance path 71 in a direction different from the branch conveyance path 70. Switch. Each of the flappers 57 is provided on the drive shaft 65 with a predetermined interval along a direction orthogonal to the sheet conveyance direction (rotation axis direction of the drive shaft 65).

  The flapper 57 is provided with a groove 57b that is an engaged portion that is loosely fitted to the convex portion 65a (see FIG. 4) of the drive shaft 65 and engages with the convex portion 65a when the drive shaft 65 rotates. Yes. A boss 57c that is rotatably engaged with a holder 63a attached to the leaf spring 63 is provided at an end portion disposed on the downstream side of the flapper 57. As a result, the end portion disposed on the downstream side of the flapper 57 is urged by the leaf spring 63.

  The flapper 57 is integrally provided with a neck portion 57a. Each of the flappers 57 is arranged with a predetermined distance on the drive shaft 65 by the neck portion 57a coming into contact with another adjacent flapper 57 and defining the distance between the drive shafts 65 in the rotation axis direction. Is provided. The flapper 57 is provided with a notch continuous from the groove portion 57 b in the neck portion 57 a along the rotation axis direction of the drive shaft 65, thereby facilitating mounting on the drive shaft 65.

  As shown in FIG. 5A, the flapper 57 is the first inner surface of the guide portion 68 of the upstream conveyance path 69 when the sheet is switched to the FD discharge branch conveyance path 71 to convey the sheet. When the upstream end 57d comes into contact with the contact surface 68a, it stops at the first stop position. As illustrated in FIG. 5B, the flapper 57 is a second inner surface of the guide portion 67 of the upstream conveyance path 69 when the sheet is switched to the FU discharge branch conveyance path 70 as illustrated in FIG. When the tip 57d comes into contact with the contact surface 67a, it stops at the second stop position.

  The flapper 57 is provided on the drive shaft 65 so as to be rotatable between a first stop position and a second stop position. In the sheet conveying device 150, the front end 57d of the flapper 57 is urged toward the first contact surface 68a or the second contact surface 67a by the leaf spring 63, so that the flapper 57 is moved to the first stop position. A toggle mechanism that exceeds the dead point when rotating between the second stop position is provided. The toggle mechanism is configured using a flapper 57, a leaf spring 63, and a drive shaft 65.

  The solenoid 61 is provided with an iron core 80 that protrudes and retracts from the solenoid 61 in response to an electrical signal from a control unit (not shown) and is rotatably engaged with the drive shaft 65. A through hole that rotatably engages with the boss 81 of the drive shaft 65 is provided at an end portion of the iron core 80 that protrudes from the solenoid 61.

  At one end in the longitudinal direction of the leaf spring 63, a holder 63a made of a highly slidable resin that engages with a boss 57c of the flapper 57 is rotatably mounted. At the other end in the longitudinal direction of the plate spring 63, a holder 63b that is attached to a support shaft 64 fixed to the image forming apparatus 100 is provided. The leaf springs 63 are arranged and mounted on the support shaft 64 at the same interval as the interval of the drive shaft 65 of the flapper 57 in the rotation axis direction.

  The leaf spring 63 is elastically deformed by the stress from the support shaft 64 and the boss 57c of the flapper 57 when the rotation of the flapper 57 shown in FIGS. 5 (a) and 5 (b) is stopped. It is. Accordingly, the leaf spring 63 can hold the tip 57d of the flapper 57 in contact with the first contact surface 68a or the second contact surface 67a.

  The drive shaft 65 includes a convex portion 65a that is an engaging portion, and is rotatably attached to the image forming apparatus. The drive shaft 65 is provided at the boundary between the upstream conveyance path 69 and the branch conveyance path 70 and the branch conveyance path 71. The drive shaft 65 rotates when the iron core 80 moves in and out of the solenoid 61 to rotate the flapper 57. The drive shaft 65 is provided with a convex portion 65a at a position corresponding to the position where each flapper 57 is provided.

  The upstream conveyance path 69 is provided on the upstream side with respect to the flapper 57 and conveys the sheet. The upstream conveyance path 69 includes a guide portion 68 that extends from the branch conveyance path 71 and a guide portion 67 that extends from the branch conveyance path 70. The guide unit 67 and the guide unit 68 guide sheet conveyance.

  The branch conveyance path 70 is provided for FU discharge and is provided on the downstream side with respect to the flapper 57, and conveys the sheet conveyed from the upstream conveyance path 69 toward the FU discharge roller 53.

  The branch conveyance path 71 is provided for FD discharge and is provided on the downstream side with respect to the flapper 57, and conveys the sheet conveyed from the upstream conveyance path 69 toward the FD discharge roller 54.

  The branch conveyance path 70 and the branch conveyance path 71 branch the sheet conveyed from the upstream conveyance path 69 and convey it in different directions.

  Note that the branch conveyance path is not limited to being provided in two branches, and may be provided in three or more paths. Further, the branch conveyance path is not limited to the case of branching toward the FU discharge roller 53 and the FD discharge roller 54, and is branched when the sheet is reversed and conveyed for printing on both sides of the sheet. It may be allowed.

<Operation of sheet conveying apparatus>
The operation of the sheet conveying apparatus 150 according to the first embodiment of the present invention will be described in detail below with reference to FIGS.

  As shown in FIG. 5, the conveyance path of the sheet P is switched by rotating the flapper 57 so that the upstream conveyance path 69 has a branch conveyance path 70 for FU discharge and a branch conveyance path 71 for FD discharge. This is done by switching. Here, FIG. 6 (a) corresponds to FIG. 5 (a), and FIG. 6 (b) corresponds to FIG. 5 (b).

  In FIG. 6A, the tip 57d of the flapper 57 is in contact with the second contact surface 67a. The boss 57c of the flapper 57, which is the point of action of the leaf spring 63, is on the upper side with respect to a straight line connecting the rotation shaft 65b of the drive shaft 65 and the axis 64b of the support shaft 64 of the leaf spring 63. The urging force F of the leaf spring 63 acts on the boss 57c of the flapper 57 in the direction of the arrow in FIG.

  As a result, the torque T in the clockwise arrow direction in FIG. 6 acts on the flapper 57 by the component force F1 of the urging force F when the boss 57c of the flapper 57 is viewed from the rotation shaft 65b of the drive shaft 65. At this time, the torque T generated in the flapper 57 does not engage the groove portion 57b of the flapper 57 and the convex portion 65a of the drive shaft 65. It acts as a force to be held in contact.

  Therefore, the sheet conveyed from the upstream conveyance path 69 can be reliably conveyed to the branch conveyance path 71, and it is possible to prevent a conveyance failure due to the sheet being caught by the front end 57 d of the flapper 57.

  Next, when the drive shaft 65 is rotated in the direction of arrow A, the convex portion 65a of the drive shaft 65 engages with the groove portion 57b of the flapper 57, and a torque T acts on the drive shaft 65. When the drive shaft 65 is further rotated in the direction of arrow A against this, the tip 57d of the flapper 57 is separated from the second contact surface 67a.

  When the drive shaft 65 is further rotated in the direction of arrow A, the shaft center 64b of the support shaft 64, the boss 57c of the flapper 57, and the rotation shaft 65b of the drive shaft 65 are on a straight line L as shown in FIG. line up. At this time, since the urging force F of the leaf spring 63 acts in the direction of the straight line L, the component force of the urging force F when the boss 57c of the flapper 57 is viewed from the rotation shaft 65b of the drive shaft 65 becomes zero. The resulting torque T is also zero. At this time, the boss 57c of the flapper 57 is located at the dead point.

  When the drive shaft 65 is slightly rotated in the direction of arrow A from this state, the boss 57c of the flapper 57 exceeds the dead center, and thus the counterclockwise torque acts on the flapper 57 by the component force F2 of the urging force F. As a result, as shown in FIG. 6C, the tip 57d of the flapper 57 is loosely fitted between the convex portion 65a and the groove portion 57b even if the rotation of the drive shaft 65 in the arrow A direction is stopped. Further, the flapper 57 is rotated in the direction of the arrow A and is held in contact with the first contact surface 68a.

  When the drive shaft 65 is rotated in the direction opposite to the arrow A direction from the state shown in FIG. 6C, the flapper 57 is brought into contact with the first contact surface 68a by the reverse movement. It is possible to switch from the state of contact to the state of contact with the second contact surface 67a.

  In this way, by providing the toggle mechanism for rotating the flapper 57, the rotation angle C of the flapper 57 with respect to the rotation angle B of the drive shaft 65 can be achieved without lengthening the time when the conveyance path is switched by the flapper 57. Can be increased. Accordingly, it is possible to reduce power consumption when the drive shaft 65 is rotated while preventing sheet conveyance failure.

  Further, the front end 57d of the flapper 57 rotates at a rotation angle larger than the rotation angle of the drive shaft 65 and contacts the first contact surface 68a or the second contact surface 67a of the upstream conveyance path 69. Thereby, even if the rotation angle of the drive shaft 65 is reduced, the position of the flapper 57 relative to the upstream conveyance path 69 can be defined with high accuracy.

  Furthermore, since each flapper 57 is individually positioned with respect to the first contact surface 68a and the second contact surface 67a of the upstream conveyance path 69, the first contact surface 68a or the second contact surface. It is not affected by variations in component accuracy such as warping of the surface 67a.

  In the present embodiment, the flapper 57 abuts on the first abutment surface 68a and conveys the sheet to the branch conveyance path 71, and abuts on the second abutment surface 67a and branches the sheet. It is supported so as to be rotatable between the second stop position for transporting to the transport path 70. Further, in the present embodiment, a toggle mechanism is provided that exceeds the dead point when the flapper 57 rotates between the first stop position and the second stop position. Thereby, according to this embodiment, the responsiveness at the time of switching a conveyance path can be improved, and speed-up and cost reduction can be achieved. Moreover, since a flexible sheet can be made unnecessary in connection with this, it can respond to the various sheet | seats from which elastic force differs, and can ensure high reliability.

[Second Embodiment]
The configuration of the image forming apparatus according to the second embodiment of the present invention is the same as that shown in FIG.

<Configuration of sheet conveying device>
With reference to FIG. 7, the configuration of the sheet conveying apparatus according to the present embodiment will be described in detail. In FIG. 7, parts having the same configurations as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the biasing means of the toggle mechanism is different from that of the first embodiment.

  The sheet conveying apparatus of the present embodiment includes a flapper 57, a solenoid 61, a drive shaft 65, an upstream conveying path 69, a branch conveying path 70, a branch conveying path 71, and a compression coil spring portion 90. Yes.

  The compression coil spring portion 90 includes a coil spring 91, a spring guide 92, and a cam follower 93.

  The coil spring 91 is attached to the spring guide 92 in a state of being compressed and elastically deformed between the spring guide 92 and the cam follower 93. The coil spring 91 urges the cam follower 93 toward the flapper 57 by an elastic restoring force.

  The spring guide 92 is fixed to the image forming apparatus.

  One end side of the cam follower 93 covers the outer periphery of the spring guide 92. The cam follower 93 is guided by a spring guide 92 and is movable in the compression and extension directions of the coil spring 92. The top portion 93 a of the cam follower 93 presses the cam surface 57 e formed at the other end of the flapper 57 by being biased by the coil spring 91.

  The cam surface 57 e of the flapper 57 is formed in a convex shape that comes into contact with the top portion 93 a of the cam follower 93 biased by the coil spring 91. When the cam surface 57e is pressed by the cam follower 93, the top portion of the convex portion becomes a dead point, and is formed in a substantially triangular shape that spreads around the top portion to constitute a toggle mechanism. Specifically, the sheet conveying apparatus has a toggle mechanism in which the position where the convex portion of the top portion 93a of the cam follower 93 abuts with the convex portion of the cam surface of the other end 57e of the flapper 57 becomes a dead point.

  In the sheet conveying apparatus, the front end 57d of the flapper 57 is urged toward the first contact surface 67a or the second contact surface 68a by the compression coil spring portion 90, and the flapper 57 is moved to the first stop position and the first stop position. A toggle mechanism that exceeds the dead point when rotating between two stop positions is provided. The toggle mechanism is configured using a flapper 57, a drive shaft 65, and a compression coil spring portion 90.

  In the sheet conveying apparatus having the above-described configuration, the flapper 57 rotates, and the convex portion of the top portion 93a of the cam follower 93 gets over the convex portion of the cam surface of the other end 57e of the flapper 57. The branch conveyance path 71 is switched.

  Thus, according to the present embodiment, the torque characteristics of the toggle mechanism can be adjusted by the shapes of the cam surface of the other end 57e of the flapper 57 and the top 93a of the cam follower 93. Further, according to the present embodiment, by using the coil spring 91, variation in spring characteristics can be suppressed, and more accurate operation of the flapper 57 can be realized.

[Third Embodiment]
The configuration of the image forming apparatus according to the third embodiment of the present invention is the same as that shown in FIG.

<Configuration of sheet conveying device>
With reference to FIG. 8, the configuration of the sheet conveying apparatus according to the present embodiment will be described in detail. In FIG. 8, parts having the same configurations as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the biasing means of the toggle mechanism is a magnetic force by a magnet as compared with the first embodiment.

  The sheet conveying apparatus of the present embodiment includes a flapper 57, a solenoid 61, a drive shaft 65, an upstream conveying path 69, a branch conveying path 70, a branch conveying path 71, a magnet 74, and a magnet 75. ing.

  The magnet 74 is fixed to the other end 57 e of the flapper 57. The magnet 74 is arranged so that the side facing the magnet 75 has the same polarity as the polarity of the magnet 75 facing the magnet 74. The magnet 74 is provided on the flapper 57 so that the urging force becomes maximum at the dead point.

  The magnet 75 is fixed to the image forming apparatus.

  The sheet conveying apparatus has a toggle mechanism in which a position where the magnet 74 and the magnet 75 are closest to each other and face each other is a dead center. Thereby, the sheet conveying apparatus has the largest repulsive force between the magnet 74 and the magnet 75 at the dead point. In the sheet conveying device, the front end 57d of the flapper 57 is urged toward the first contact surface 67a or the second contact surface 68a by the magnetic force of the magnets 74 and 75 repelling each other. The sheet conveying apparatus includes a toggle mechanism that exceeds the dead point when the flapper 57 rotates between the first stop position and the second stop position by the biasing. The toggle mechanism includes a flapper 57, a drive shaft 65, a magnet 74, and a magnet 75.

  The sheet conveying apparatus having the above configuration switches the branch conveyance path 70 and the branch conveyance path 71 when the flapper 57 rotates and exceeds the position where the magnet 74 and the magnet 75 are closest to each other and face each other.

  Thus, according to this embodiment, compared with the said 1st Embodiment and 2nd Embodiment, a number of parts can be decreased and size reduction of an apparatus can be achieved.

[Fourth Embodiment]
The configuration of the image forming apparatus according to the fourth embodiment of the present invention is the same as that shown in FIG.

<Configuration of sheet conveying device>
With reference to FIG. 9, the configuration of the sheet conveying apparatus according to the present embodiment will be described in detail. In FIG. 9, parts having the same configurations as those in FIGS.

  In the present embodiment, similarly to the third embodiment, the biasing means of the toggle mechanism is a magnetic force by a magnet with respect to the first embodiment.

  The sheet conveying apparatus of this embodiment includes a flapper 57, a solenoid 61, a drive shaft 65, an upstream conveying path 69, a branch conveying path 70, a branch conveying path 71, a magnet 95, a magnet 96, and a magnet 97. ,have.

  The magnet 95 is fixed to the other end 57 e of the flapper 57. The magnet 95 is disposed such that the side facing the magnet 96 and the magnet 97 has a polarity different from the polarity of the magnet 96 and the side of the magnet 97 facing the magnet 95. The magnet 95 is provided on the flapper 57 so that the attractive force from the magnet 96 and the magnet 97 becomes the same at the dead point.

  The magnet 96 is fixed to the image forming apparatus. The magnet 96 is provided at a position facing the magnet 95 at a first stop position of the flapper 57 where the tip 57d of the flapper 57 contacts the first contact surface 68a.

  The magnet 97 is fixed to the image forming apparatus. The magnet 97 is provided at a position facing the magnet 95 at the second stop position of the flapper 57 where the tip 57d of the flapper 57 contacts the second contact surface 67a.

  The sheet conveying apparatus has a toggle mechanism in which a position where the magnetic force attracting the magnet 95 and the magnet 96 and the magnetic force attracting the magnet 95 and the magnet 97 become the same is the dead point. The sheet conveying device rotates the flapper 57 between the first stop position and the second stop position by a magnetic force that attracts the magnet 95 and the magnet 96 or a magnetic force that attracts the magnet 95 and the magnet 97. It has a toggle mechanism that exceeds the dead center when moving. The toggle mechanism includes a flapper 57, a drive shaft 65, a magnet 95, a magnet 96, and a magnet 97.

  In the sheet conveying apparatus having the above-described configuration, the flapper 57 rotates and exceeds the position where the attracting force from the magnet 96 and the attracting force from the magnet 97 in the magnet 95 are the same. The branch conveyance path 71 is switched.

  According to this embodiment, compared with the said 1st Embodiment and 2nd Embodiment, a number of parts can be decreased and size reduction of an apparatus can be achieved.

  In the present invention, the type, arrangement, number, and the like of the members are not limited to the above-described embodiments, and the constituent elements thereof are appropriately replaced with those having the same operational effects, and the gist of the invention is not deviated. Of course, it can be appropriately changed within the range.

57 flapper 57a neck 57b groove 57d tip 63 leaf spring 65 drive shaft 65a convex 67a second contact surface 68a first contact surface 69 upstream transport path 70 branch transport path 71 branch transport path 100 image forming apparatus 150 sheet transport apparatus

Claims (9)

A sheet conveying apparatus for conveying a sheet from upstream to downstream,
An upstream conveyance path for conveying a sheet;
A plurality of branch conveyance paths for branching a sheet conveyed from the upstream conveyance path and conveying the sheet downstream;
A first stop position that contacts the first contact surface of the upstream transport path to guide the sheet to a predetermined branch transport path, and a sheet that contacts the second contact surface of the upstream transport path the predetermined branch conveying path is rotatably supported between a second stop position for guiding the different branch conveying path, along with switching the branch transport path the sheet is conveyed by the rotation of the rotating A switching member provided with a toggle mechanism that exceeds the dead center at the time ,
A rotatable drive shaft with an engagement portion;
Have
The switching member is
It has an engaged part that loosely fits with the engaging part, and rotates together with the drive shaft by engaging the engaging part and the engaged part until the dead point of the toggle mechanism is exceeded. ,
The drive shaft is
The sheet conveying apparatus, wherein the switching member rotates at an angle smaller than an angle at which the switching member rotates between the first stop position and the second stop position . The toggle mechanism is
Sheet transport according to claim 1 Symbol mounting, characterized in that it is biased toward the first stop position and the second stop position by a spring when the switching member is rotated beyond the dead point apparatus. The toggle mechanism is
Cam surface is formed on the switching member, the sheet of claim 1 Symbol mounting, characterized in that it is biased toward the first stop position and the second stop position by pressing the cam surface Conveying device. The toggle mechanism is
The switch member is biased toward the first stop position or the second stop position by magnetic forces repelling each other when the switching member is rotated beyond the dead point. 1 Symbol placement of the sheet conveying device. The toggle mechanism is
Claim 1, wherein the switching member is in when it is rotated beyond the dead point, characterized in that it is biased towards the first stop position and the second stop position by the magnetic force attract each other serial mounting of the sheet conveying device. The switching member is
That provided in plurality at predetermined intervals along the direction perpendicular to the conveying direction of the sheet
Sheet conveying device according to any one of claims 1 to 5, characterized and this. The switching member is
The neck portion provided along the direction the perpendicular, Ru are arranged with a predetermined distance by abutting the other of the switching member adjacent
Sheet transport apparatus according to claim 6, wherein the this. A sheet conveying apparatus for conveying a sheet from upstream to downstream,
An upstream conveyance path for conveying a sheet;
A plurality of branch conveyance paths for branching a sheet conveyed from the upstream conveyance path and conveying the sheet downstream;
A first stop position that contacts the first contact surface of the upstream transport path to guide the sheet to a predetermined branch transport path, and a sheet that contacts the second contact surface of the upstream transport path The second conveying position is supported so as to be rotatable with respect to a second stop position that is guided to a branch conveyance path different from the predetermined branch conveyance path, and the rotation of the branch conveyance path through which the sheet is conveyed is switched. A switching member provided with a toggle mechanism that exceeds the dead center at the time,
Have
The switching member is
A plurality of predetermined intervals are provided along a direction orthogonal to the sheet conveyance direction, and the predetermined intervals are provided by bringing a neck portion provided along the orthogonal direction into contact with another adjacent switching member. Arranged
A sheet conveying apparatus. Ru having a sheet conveying apparatus according to any one of claims 1 to 8
An image forming apparatus comprising and this.