JP2007064343A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress impulsive noise during drive control and suppress uncomfortable audible noise by reducing a noise peak value. <P>SOLUTION: A tip shape of a flapper 3 is divided into an engagement part 3b engaged with a lock part 1b of a cam part 1a and a landing part 3a to the cam part 1a at the time of release of flapper magnetization. A sound deadening material 4 such as a foam elastic material is provided at a flapper landing portion of the cam part 1a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power transmission device applied to a wide range of products such as office machine products such as copying machines and laser beam printers, and audiovisual products such as VTRs and DVDs.

  Conventionally, a drive transmission device using a chipped gear is known (see Patent Document 1). FIG. 7 is a diagram for explaining the operation of the conventional drive transmission device.

In FIG. 7, reference numeral 201 denotes a missing tooth gear having a missing tooth portion in which a part of teeth is missing on the circumference in order to cut off the drive transmission transmitted from the drive motor by the idler gear, and 201 a denotes a side surface of the missing tooth gear 201. , 201b is a locking portion provided in the cam portion 201a for controlling the rotation of the chipped gear 201, 202 is a solenoid for controlling the rotation of the chipped gear, and 203 is provided on the solenoid 202. Flapper, 203a is a flapper engaging portion that engages with the chipped gear locking portion 201b,
FIG. 7A shows an initial state in the operation diagram of the power transmission device.

  In the initial state shown in FIG. 7A, the drive transmission gear 208 rotates in the arrow A direction. The chipped gear 201 attempts to rotate in the direction of arrow B indicated by a dotted line by a biasing means (not shown), but the engagement portion 203a of the flapper 203 is connected to the cam locking portion 201b provided on the side surface of the chipped gear 201. By being engaged, it remains in the position shown in the figure. Accordingly, at this time, the chipped portion of the chipped gear 201 is positioned just on the pitch circle of the drive transmission gear 208 and does not receive the driving force from the drive transmission gear 208.

  Next, in response to a signal from the main body firmware, a signal is sent to the solenoid 202, and when the solenoid 202 is magnetized, the flapper 203 rotates in the direction of arrow C as shown in FIG. Then, the engagement portion 203a of the flapper 203 and the cam locking portion 201b that were engaged in the initial state of FIG. 7A are released, and the chipped gear 201 is rotated in the direction of arrow B by an unillustrated biasing means. Move.

  At this time, since the toothed portion of the chipped gear 201 jumps into the pitch circle of the drive transmission gear 208, the chipped gear 201 receives the driving force from the drive transmission gear 208 and rotates in the arrow B direction. Start. Here, when the drive transmission device shown in FIG. 7 is applied to a feeding device of a laser beam printer, the chipped gear 201 is fitted to the feeding shaft of the feeding device, and the chipped gear 201 rotates. Thus, the feeding operation is started by the feeding means rotating through the feeding shaft.

  After the rotation of the chipped gear 201 is on the track, the magnetism of the solenoid 202 is released, and the flapper 203 is rotated in the direction of arrow D by the biasing force of the biasing spring 202a as shown in FIG. . Then, the engaging portion 203 a of the flapper 203 lands (contacts) with the cam portion 201 a of the chipped gear 201. At this time, since the chipped gear 201 receives the driving force from the drive transmission gear 208 and continues to rotate in the direction of arrow B, the engagement portion 203a slides on the cam portion 201a.

Then, when the chipped gear 201 continues to rotate and the last tooth of the toothed portion of the chipped gear 201 moves away from the pitch circle of the drive transmission gear 208 as shown in FIG. It is. However, when the chipped gear 201 is rotated by a biasing means (not shown), the engagement portion 203a of the flapper 203 is provided on the side surface of the chipped gear 201 as shown in FIG. Engage with the part 201b. This returns to the initial state. Then, the rotation of the chip gear 201 is stopped, the rotation of the feeding means transmitted by the feeding shaft is also stopped, and the feeding operation is ended.
JP-A-8-169576

  However, in the case of the prior art as described above, the following problems may occur.

  That is, as shown in FIG. 7C, the magnetism of the solenoid 202 is released, and the flapper engagement portion 203a is landed on the cam surface 201a by the biasing force of the biasing spring 202a. At that time, a contact impact sound between the flapper engaging portion 203a formed of a metal member and the cam surface 201a formed of a resin material is rotated each time the chip gear 201 rotates (the drive transmission unit is used as the sheet feeding unit). Always occurred every time the paper was fed. This impact sound is very unpleasant to the user in a laser beam printer whose throughput is increasing rapidly, and at the same time, it may be a major factor that adversely affects noise standards such as Blue Angel. .

  Further, the flapper engaging portion 203a, which had to be sharply configured to engage with the cam locking portion 201b, is constantly camped in the flow of operation shown in FIGS. 7 (c) to (d). The contact with the surface 201a is likely to be a factor of the overall driving torque UP.

  The present invention has been made in view of the circumstances as described above, and it is an object of the present invention to suppress unpleasant sound on hearing by suppressing the generation of impact sound during drive control and reducing the noise peak value. To do.

In order to achieve the above object, in the present invention,
A drive transmission gear for transmitting the driving force from the drive source;
A toothed portion that meshes with the drive transmission gear to transmit the rotation of the drive transmission gear, and a missing tooth portion that lacks a portion of the toothed portion to block transmission of the rotation of the drive transmission gear. A chipped gear having,
Biasing means for biasing the chipped gear so that the chipped gear rotates from the chipped portion toward the toothed portion in order to mesh the chipped gear with the drive transmission gear;
A rotating member having a locking portion and rotatably provided in conjunction with rotation of the chipped gear;
A regulating means for regulating rotation of the chipped gear by having a flapper movable with respect to the rotating member, and locking the flapper to the locking portion of the rotating member;
In the power transmission device with
A positioning portion for positioning the flapper relative to the rotating member when the flapper is locked by the locking portion;
When the flapper moves and is positioned by the positioning unit, the positioning unit includes a silencer that suppresses a sound generated when the flapper is positioned at the positioning unit.

  According to the present invention, it is possible to suppress unpleasant sound on hearing by suppressing the generation of impact sound during drive control and reducing the noise peak value.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. It is not intended to limit the scope to the following embodiments.

  FIG. 5 is a schematic cross-sectional view of a laser beam printer main body as the image forming apparatus of Embodiment 1 of the present invention.

  In FIG. 5, 113 is a feeding unit, 114 is a sheet stacking plate, 115 is a stacking plate biasing spring for biasing the sheet stacking plate 114 in the direction of the feeding unit 113, 107 is a laser beam printer main body, 116 is a separating unit, and 117. Indicates a conveying means for conveying the fed recording material P. Reference numeral 118 denotes a photosensitive drum as an electrophotographic photosensitive member (image carrier), 119 denotes laser scanning optical means for irradiating the photosensitive drum 118 with an optical image corresponding to image information, and 120 denotes a process cartridge having the photosensitive drum 118. It is. Reference numeral 121 denotes a transfer roller for transferring a toner image developed on the photosensitive drum 118 by a developer (hereinafter referred to as toner) to a recording material. Reference numeral 122 denotes a fixing roller for fixing an unfixed toner image on the recording material. , 123 are pressure rollers. Reference numeral 124 denotes a discharge roller pair for discharging the fixed image to the outside of the printer main body, and 125 denotes a discharge stacking unit for stacking the discharged recording material.

  FIG. 6 is a schematic perspective view showing the periphery of the feeding device to which the power transmission device according to this embodiment is applied in the laser beam printer main body 107.

  A drive motor 112 is provided on the frame of the laser beam printer main body 107 and serves as a drive source for each gear. Reference numeral 8 denotes a drive transmission gear, and reference numerals 109 to 111 denote idler gears. These gears are provided to transmit driving (driving force) from the driving motor 112.

  Reference numeral 1 denotes a chipped gear. The toothless gear includes a toothed portion 1c to which driving is transmitted from the drive motor 112 by the idler gears 109 to 111 and the drive transmission gear 8, and teeth (toothed on the circumference in order to cut off the drive transmission from the drive motor 112. And a missing tooth portion 1d in which a part of the portion is missing.

  Reference numeral 113 denotes a feeding unit, and 126 denotes a feeding shaft that holds the feeding unit 113 and is provided to be fitted to the chipped gear 1 and transmits the rotation of the chipped gear 1 to the feeding unit 113. ing.

  The operation of the laser beam printer using the power transmission device will be described below.

  As shown in FIG. 5, the recording material P stacked on the sheet stacking plate 114 of the laser beam printer main body 107 is pressed in the direction of the feeding unit 113 by the biasing spring 115, and is fed by the feeding unit 113 and the separating unit 116. Separated one by one and fed. The fed recording material P is conveyed by a conveying means 117 to a photosensitive drum 118 disposed in a process cartridge 120 serving as a recording means, and a toner image on the photosensitive drum 118 is transferred onto the recording material P by a transfer roller 121. Is done. Thereafter, the recording material P is heated and pressed by the roller pair of the fixing roller 122 and the pressure roller 123, and the toner image on the recording material P is fixed as a permanent image. Thereafter, the recording material P is discharged onto the discharge stacking portion 125 by the discharge roller pair 124.

  Hereinafter, the power transmission device according to the present embodiment will be described.

1A and 1B are diagrams showing a power transmission device according to the present embodiment, in which FIG. 1A is a schematic side view, and FIG. 1B is a schematic perspective view of FIG. FIG. 2 is an operation explanatory diagram of the power transmission device according to the present embodiment, and FIGS.

  In FIGS. 1 and 2, reference numeral 1 a denotes a cam portion as a rotating member provided on the side surface of the chipped gear 1, and reference numeral 1 b denotes a locking portion that is provided on the cam portion 1 a and restricts the rotation of the chipped gear 1. Reference numeral 2 denotes a flapper type solenoid (hereinafter referred to as a solenoid) as a regulating means for regulating (controlling) the rotation of the chipped gear 1.

  Reference numeral 3 denotes a flapper provided in the solenoid 2. At the tip of the flapper 3, a landing portion 3a as a first tip portion and an engaging portion 3b as a second tip portion are provided. In the flapper 3, the landing portion 3a constitutes a landing portion on the cam portion 1a formed in a substantially semicircular shape (substantially circular arc shape), and the engaging portion 3b constitutes an engaging portion with the locking portion 1b. ing.

  Reference numeral 4 denotes a sound deadening material using a foamed elastic member made of silicon elastomer provided for preventing impact sound between the cam portion 1a and the landing portion 3a provided on the flapper 3. The sound deadening material 4 is provided in a contact portion of the outer peripheral portion of the cam portion 1a where the landing portion 3a contacts the outer peripheral portion as the flapper 3 moves. Here, the cam part 1a (the outer peripheral part thereof) and the landing part 3a constitute a positioning part according to the present invention. Reference numeral 2a denotes a biasing spring that biases the flapper 3 in one direction.

  Next, the operation and effect of the power transmission device according to this embodiment will be described.

  1 and 2 (a) show the initial state in the operation diagram of the power transmission device.

  In the initial state shown in FIGS. 1 and 2A, the drive transmission gear 8 is rotated in the direction of arrow A by the drive motor 112. The chipped gear 1 urges the chipped gear 1 so that the chipped gear 1 rotates from the chipped portion to the toothed portion in order to mesh the chipped gear 1 with the drive transmission gear 8. It tries to rotate in the direction of the dotted arrow B by the action of the means. However, the engaging portion 3b of the flapper 3 remains in the position shown in the figure by being engaged with the cam locking portion 1b provided on the side surface of the chipped gear 1. Accordingly, the chipped portion of the chipped gear 1 is positioned just on the pitch circle of the drive transmission gear 8 and does not receive the driving force from the drive transmission gear 8.

  Next, in response to a signal from the main body firmware, a signal is sent to the solenoid 2, and when the solenoid 2 is magnetized, the flapper 3 rotates in the direction of arrow C as shown in FIG. Then, the engagement state between the engaging portion 3b of the flapper 3 and the cam locking portion 1b engaged in the initial state of FIG. 2A is released, and the chipped gear 1 is moved in the direction of arrow B by the urging means. To turn.

  At this time, since the toothed portion of the chipped gear 1 jumps onto the pitch circle of the drive transmission gear 8, the chipped gear 1 receives the driving force from the drive transmission gear 8 and is driven in the direction of arrow B. The rotation by the driving force from 8 is started. At this time, the chipped gear 1 is fitted to the feeding shaft 126, and when the chipped gear 1 rotates, the feeding means 113 also rotates through the feeding shaft 126, and the feeding operation starts.

  After the rotation of the chipped gear 1 is on the track, the magnetizing of the solenoid 2 is released, and the flapper 3 is rotated in the direction of arrow D by the biasing force of the biasing spring 2a as shown in FIG. The landing portion 3 a of the flapper 3 contacts the sound deadening material 4 provided on the cam portion 1 a of the chipped gear 1.

  At this time, the impact sound caused by the contact between the landing portion 3a and the cam portion 1a is absorbed by the sound deadening material 4, so that the impact sound is hardly generated and the operation is very quiet.

At this time, since the chipped gear 1 receives the driving force from the drive transmission gear 8 and continues to rotate in the direction of arrow B, the landing portion 3a is located on the silencer 4 and the cam portion 1a (the outer peripheral portion thereof). Will slide. However, since the landing part 3a is formed in a substantially semicircular shape as shown in the figure, the sliding resistance is very small, and even when the silencer 4 is provided, it does not change much from the conventional resistance. In this embodiment, a foamed elastic member made of silicon elastomer is used as a silencer for preventing impact noise. However, it is possible to further reduce sliding resistance by using a member with a resin material protective layer such as PFA resin coating on the surface of a foamed elastic member with a high surface friction coefficient such as urethane elastomer. It is. PFA is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether.

  Then, when the chipped gear 1 continues to rotate and the last tooth of the toothed portion of the chipped gear 1 moves away from the pitch circle of the drive transmission gear 8 as shown in FIG. Will be. However, since the chipped gear 1 is rotated by the urging means, the engaging portion 3b of the flapper 3 is engaged with the cam locking portion 1b provided on the side surface of the chipped gear 1, so that FIG. ) Is returned to the initial state. Then, the rotation of the chipped gear 1 is stopped, the rotation of the feeding means 113 transmitted by the feeding shaft 126 is also stopped, and the feeding operation is ended.

  As described above, in the present embodiment, the landing portion 3a to the cam portion 1a is newly provided at the tip portion of the flapper 3 in addition to the cam engaging portion. Further, a foamed elastic member made of silicon elastomer (or a member provided with a resin material protective layer such as a PFA resin coat on the surface of a foamed elastic member having a high surface friction coefficient such as urethane elastomer) at the landing position of the flapper 3 of the cam portion 1a. The used silencer 4 is provided. As a result, it is possible to prevent the generation of impact sound that was generated when the flapper tip and the cam section were impacted when the flapper suction was released. In addition, it is possible to provide a power transmission device that is excellent in the effect of suppressing unpleasant sound on hearing.

  Further, the tip shape of the flapper 3 is divided into an engaging portion 3b that engages with the cam portion 1a and a landing portion 3a on the cam portion 1a. As a result, the shape of the landing portion on the cam portion 1a can be made substantially semicircular, and the contact resistance between the cam portion 1a and the tip of the flapper 3 is reduced as compared with the prior art, and the torque can be reduced as compared with the prior art. A drive transmission device can be provided.

  FIG. 3 is a diagram illustrating the power transmission apparatus according to the second embodiment. FIGS. 3A to 3C are operation explanatory diagrams shown in the order of operation, and FIG. 3D is a schematic perspective view. The image forming apparatus according to the present embodiment has the same configuration as the image forming apparatus according to the above-described embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 3, 11 is a chipped gear, 11a is a cam part as a rotating member provided on the side surface of the chipped gear, and 11b is a locking part provided on the cam part 11a for controlling the rotation of the chipped gear. Reference numeral 12 denotes a flapper type solenoid (hereinafter referred to as a solenoid) as a regulating means for controlling the chipped gear 11.

  Reference numeral 13 denotes a flapper provided on the solenoid 12, and a landing portion 13a as a first tip portion and an engaging portion 13b as a second tip portion are provided at the tip of the flapper 13. In the flapper 13, the landing part 13a constitutes a landing part on the cam part 11a, and the engaging part 13b constitutes an engaging part with the locking part 11b.

  Reference numeral 5 denotes a silencer roller member as a rotating body pivotally supported by the flapper landing portion 13a and formed of an elastic member such as an elastomer. In the schematic perspective view of FIG. 3D, the drive transmission gear 8 is omitted. I draw.

  Next, the operation and effect of the power transmission device according to this embodiment will be described.

  FIG. 3A shows the initial state in the power transmission device operation diagram.

  In the initial state shown in FIG. 3A, the drive transmission gear 8 is rotated in the direction of arrow A by the drive motor 112. The chipped gear 11 biases the chipped gear 11 so that the chipped gear 11 rotates from the chipped portion 11d toward the toothed portion 11c in order to mesh the chipped gear 11 with the drive transmission gear 8. It tries to rotate in the direction of arrow B shown by the dotted line by the action of the urging means. However, the engaging portion 13b of the flapper 13 remains at the position shown in the figure by being engaged with the cam locking portion 11b provided on the side surface of the chipped gear 11. Accordingly, the chipped portion of the chipped gear 11 is positioned just on the pitch circle of the drive transmission gear 8 and does not receive the driving force from the drive transmission gear 8.

  Next, a signal is sent to the solenoid 12 by a signal from the main body firmware, and when the solenoid 12 is magnetized, the flapper 13 rotates in the direction of arrow C as shown in FIG. Then, the engagement state between the engaging portion 13b of the flapper 13 and the cam locking portion 11b engaged in the initial state of FIG. 3A is released, and the chipped gear 11 is moved in the arrow B direction by the urging means. To turn.

  At this time, since the toothed portion of the chipped gear 11 jumps onto the pitch circle of the drive transmission gear 8, the chipped gear 11 receives the driving force from the drive transmission gear 8 and drives the drive transmission gear in the direction of arrow B. The rotation by the driving force from 8 is started. At this time, the chipped gear 11 is fitted to the feeding shaft 126, and when the chipped gear 11 rotates, the feeding means 113 also rotates through the feeding shaft 126, and the feeding operation starts.

  After the rotation of the chipped gear 11 is on the track, the magnetism of the solenoid 12 is released, and the flapper 13 is rotated in the direction of arrow D by the biasing force of the biasing spring 2a as shown in FIG. . Then, the silencing roller member 5 pivotally supported by the landing portion 13 a of the flapper 13 lands on the cam portion 11 a (outer peripheral portion) of the chipped gear 11.

  At this time, the impact sound resulting from the contact between the silencer roller member 5 and the cam portion 11a is absorbed by the silencer roller member 5 formed of an elastic member such as an elastomer, so there is almost no occurrence of the impact sound. Very quiet operation.

  At this time, the chipped gear 11 receives the driving force from the drive transmission gear 8, continues to rotate in the direction of arrow B, and the silencer roller member 5 rotates in the direction of arrow. The sliding resistance can be further reduced as compared with sliding with the portion 11a.

  Thereafter, the operation of the drive transmission device returning to the initial state is the same as that of the first embodiment, and thus the description thereof is omitted.

  As described above, in this embodiment, the roller member formed of an elastic member such as an elastomer that is pivotally supported by the cam portion 11a landing portion 13a at the tip of the flapper 13 is provided. As a result, in addition to the effects of the first embodiment, the sliding resistance between the cam portion 11a and the landing portion 13a of the flapper 13 can be further reduced, which is superior in functionality and more effective than the first embodiment. It is possible to provide a typical power transmission device.

  The silencer roller member 5 may be any member as long as the portion in contact with the cam portion 11a is made of an elastic member such as an elastomer.

  FIGS. 4A and 4B are diagrams showing a power transmission device according to a third embodiment of the present invention, in which FIGS. 4A to 4C are operation explanatory views shown in the order of operation, and FIG. 4D is a schematic perspective view. . The image forming apparatus according to the present embodiment has the same configuration as the image forming apparatus according to the above-described embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 4, 21 is a chipped gear, 21a is a cam portion as a rotating member provided on the side surface of the chipped gear, and 21b is a locking portion provided on the cam portion 21a for controlling the rotation of the chipped gear. Reference numeral 22 denotes a flapper type solenoid (hereinafter referred to as a solenoid) as a regulating means for controlling the chipped gear 21. 23 is a flapper provided on the solenoid 22, 23a is an engaging portion with the engaging portion 21b, 24 is a silencer made of a foamed elastic member such as an elastomer, and 6 is a flapper provided integrally with the solenoid 22 after releasing the magnetization. Each of the flapper positioning portions is shown. Note that the drive transmission gear 8 is omitted in the schematic perspective view of FIG.

  Next, the operation and effect of the power transmission device according to this embodiment will be described.

  FIG. 4A shows an initial state in the power transmission device operation diagram.

  In the initial state shown in FIG. 4A, the drive transmission gear 8 is rotated in the direction of arrow A by the drive motor 112. The chipped gear 21 biases the chipped gear 11 so that the chipped gear 11 rotates from the chipped portion 21d toward the toothed portion 21c in order to mesh the chipped gear 11 with the drive transmission gear 8. It tries to rotate in the direction of arrow B shown by the dotted line by the action of the urging means. However, the engaging portion 23a of the flapper 23 remains in the position shown in the figure by being engaged with the cam locking portion 21b provided on the side surface of the chipped gear 21. Accordingly, the chipped portion of the chipped gear 21 is positioned just on the pitch circle of the drive transmission gear 8 and does not receive the driving force from the drive transmission gear 8.

  Next, a signal is sent to the solenoid 22 by a signal from the main body firmware, and when the solenoid 22 is magnetized, the flapper 23 rotates in the direction of arrow C as shown in FIG. Then, the engaged state of the engaging portion 23a of the flapper 23 and the cam locking portion 21b that have been engaged in the initial state of FIG. 4A is released, and the chipped gear 21 is moved in the direction of arrow B by the urging means. To turn.

  At this time, since the toothed portion of the chipped gear 21 jumps onto the pitch circle of the drive transmission gear 8, the chipped gear 21 receives the driving force from the drive transmission gear 8 and drives the drive transmission gear in the direction of arrow B. The rotation by the driving force from 8 is started. At this time, the chipped gear 21 is fitted to the feeding shaft 126, and when the chipped gear 21 rotates, the feeding means 113 also rotates through the feeding shaft 126, and the feeding operation starts.

  After the rotation of the chipped gear 21 gets on the track, the magnetizing of the solenoid 22 is released, and the flapper 23 is rotated in the direction of arrow D by the biasing force of the biasing spring 2a as shown in FIG. 4 (c). Then, it lands on the silencer 24 provided on the flapper positioning portion 6 and is stopped and positioned.

At this time, since the cam portion 21a and the engaging portion 23a are separated from each other, no impact sound is generated due to the contact between the cam portion 21a and the engaging portion 23a. Since the impact between the flapper 103 and the flapper positioning portion 6 is alleviated by the sound deadening material 24, the impact sound is hardly generated and the operation is very quiet. Further, since there is no sliding between the tip of the flapper 23 and the cam portion 21a, which has conventionally occurred after the landing of the flapper, there is no generation of sliding resistance, which is effective in reducing the torque of the entire drive system. Further, in this embodiment, a case where the flapper positioning portion 6 is integrally provided on the solenoid 22 is described. However, even if the flapper positioning portion 6 is provided on the frame of the power transmission device main body or the frame of the laser beam printer main body 107 (device main body to which the power transmission device is applied), the same effect can be obtained. Can do.

  Thereafter, the operation of the drive transmission device returning to the initial state is the same as that of the first embodiment, and thus the description thereof is omitted.

  As described above, in this embodiment, the flapper positioning portion 6 after release of flapper magnetization is provided, and the silencer 24 made of a foamed elastic member such as an elastomer is provided in the flapper positioning portion 6. Thus, in addition to the effects of the first and second embodiments described above, a power transmission device that is very effective in reducing the torque of the entire drive system, can be simplified in configuration, and has a more reliable effect is provided. Can do.

1 is a schematic diagram showing a drive transmission device according to Embodiment 1 of the present invention. Operation | movement explanatory drawing of the drive transmission apparatus which concerns on Example 1 of this invention. Operation | movement explanatory drawing of the drive transmission apparatus which concerns on Example 2 of this invention. Operation | movement explanatory drawing of the drive transmission apparatus which concerns on Example 3 of this invention. 1 is a schematic sectional view of an image forming apparatus according to an embodiment of the present invention. Schematic of the periphery of a feeding device to which a drive transmission device according to an embodiment of the present invention is applied. Operation | movement explanatory drawing of the conventional drive transmission apparatus.

Explanation of symbols

1,11,21 Chipped gear 1a, 11a, 21a Cam part 1b, 11b, 21b Locking part 2, 12, 22 Flapper type solenoid 3, 13, 23 Flapper 3a, 13a, Landing part 3b, 13b, 23a Engagement 4,24 Silencer material 5Silent roller member 6Flapper positioning part 8Drive transmission gear 23a Engagement part

Claims (10)

A drive transmission gear for transmitting the driving force from the drive source;
A toothed portion that meshes with the drive transmission gear to transmit the rotation of the drive transmission gear, and a missing tooth portion that lacks a portion of the toothed portion to block transmission of the rotation of the drive transmission gear. A chipped gear having,
Biasing means for biasing the chipped gear so that the chipped gear rotates from the chipped portion toward the toothed portion in order to mesh the chipped gear with the drive transmission gear;
A rotating member having a locking portion and rotatably provided in conjunction with rotation of the chipped gear;
A regulating means for regulating rotation of the chipped gear by having a flapper movable with respect to the rotating member, and locking the flapper to the locking portion of the rotating member;
In the power transmission device with
A positioning portion for positioning the flapper relative to the rotating member when the flapper is locked by the locking portion;
A power transmission device, comprising: a silencer that suppresses a sound generated when the flapper is positioned at the positioning unit when the flapper is positioned by the positioning unit. The positioning portion includes an outer peripheral portion of the rotating member and a first tip portion of the flapper that contacts the outer peripheral portion,
The locking portion is constituted by a second tip portion of the flapper,
2. The silencer is provided at a contact portion of the outer peripheral portion of the rotating member where the first tip portion contacts the outer peripheral portion as the flapper moves. Power transmission device.   3. The power transmission device according to claim 2, wherein a shape of a portion of the first tip portion that abuts on the outer peripheral portion of the rotating member has a substantially arc shape in cross section. The positioning portion includes an outer peripheral portion of the rotating member and a first tip portion of the flapper that contacts the outer peripheral portion,
The locking portion is constituted by a second tip portion of the flapper,
The power transmission device according to claim 1, wherein the silencer is provided at the first tip portion. The first tip portion is provided with a rotating body that rotates while contacting the outer peripheral portion of the rotating member,
The power transmission device according to claim 4, wherein the silencer is provided in at least a portion of the rotating body that contacts the rotating member. The regulating means includes a solenoid that moves the flapper by performing an operation of sucking and releasing the suction,
The power transmission device according to claim 1, wherein the positioning portion is provided in the solenoid.   The power transmission device according to claim 1, wherein the positioning portion is provided on a frame body of the apparatus main body.   The power transmission device according to any one of claims 1 to 7, wherein the silencer is constituted by a foamed elastic member made of a silicon elastomer.   8. The power transmission device according to claim 1, wherein the silencer includes a foamed elastic member having a high surface friction coefficient and a protective layer provided on a surface of the foamed elastic member. . The power transmission device according to claim 9, wherein the protective layer is a PFA resin coat layer, and is fixed to the foamed elastic member by bonding.

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