JP5893451B2 - Drive transmission device - Google Patents

Description

  The present invention relates to a drive transmission device including a first coupling member and a second coupling member.

  In an image forming apparatus that forms an image by electrophotography, each device such as a developing unit, a photosensitive drum unit, a transfer unit, and a paper transport unit is unitized, and the driving of these functional units is installed in the image forming apparatus. The motor, which is the drive source, is driven through a gear train and a drive shaft system.

  Such a drive system is provided with a drive transmission device that allows the drive system to be disconnected at the same time when the functional unit is removed from the image forming apparatus.

  As an example of such a drive transmission device, a structure in which a coupling member is fixed to a shaft end portion using a fastening screw is disclosed (for example, see Patent Document 1).

JP 2007-139005 A

  However, if the coupling member is fixed to the shaft end with a fastening screw, if the functional unit receives a sudden impact or receives continuous vibration during use, the fastening screw loosens, and the coupling member Shaking on the shaft may occur or the coupling member may fall off the shaft.

  In view of the above problems, an object of the present invention is to provide a drive transmission device that can be easily mounted and can obtain a strong fastening state.

  The drive transmission device of the present invention includes a shaft, a pin, a first coupling member, and a second coupling member.

  The shaft mainly supports a rotating body such as a transfer roller. The pin is mounted in the radial direction of the shaft. The first coupling member includes a first cylindrical portion made of an elastic body, passes through the pin, is inserted into the shaft, and is detachable from the shaft. The second coupling member is composed of a second cylindrical portion disposed at a distal end portion in the mounting direction on the shaft and a third cylindrical portion having a larger diameter than the second cylindrical portion, and holds a pin in the second cylindrical portion. , Detachable with respect to the shaft and coupled to the first coupling member.

  The first coupling member has a rib, a first cutout portion, and a long hole portion. The rib is formed on the inner peripheral surface of the first cylindrical portion, forms a storage space for storing the pin, and prevents the first coupling member from being detached from the shaft when the pin is stored in the storage space. To do. The first notch is formed in the rib and stores the pin in the storage space. The long hole portion is formed along the peripheral surface of the first cylindrical portion.

  The second coupling member has a holding portion and a first protrusion. A holding part is formed in the 2nd cylindrical part, and controls rotation of a coupling member by holding a pin. A 1st projection part is formed in the outer peripheral surface of a 2nd cylindrical part, and when a 1st coupling member is pressed with respect to a 2nd coupling member, it engages with a long hole part.

  The first coupling member has a locking portion. The locking portion is formed at the first end of the long hole portion and locks the first protrusion.

  When the first coupling member is rotated by a predetermined angle with respect to the second coupling member in a state where the first protrusion is engaged with the elongated hole portion, the first protrusion reaches the locking portion. It is combined with the second coupling member by being locked.

  In this configuration, no tool is required when the first coupling member and the second coupling member are coupled. Therefore, it is possible to easily combine the members with each other and to suppress complication of component management.

  In this configuration, the first coupling member and the second coupling member can be firmly coupled to the shaft without any tool. Therefore, the driving force from the driving source can be efficiently transmitted to the shaft.

  The drive transmission device according to the present invention can be easily mounted and can obtain a firm fastening state.

It is an exploded view of the drive transmission device concerning the embodiment of the present invention. It is a front perspective view of the 1st coupling member of the drive transmission device concerning the embodiment of the present invention. It is a back perspective view of the 1st coupling member of the drive transmission device concerning the embodiment of the present invention. It is a front perspective view of the 2nd coupling member of the drive transmission device concerning the embodiment of the present invention. It is a perspective view which shows the state which the 1st coupling member and 2nd coupling member of the drive transmission apparatus which concern on embodiment of this invention couple | bonded.

  Hereinafter, a drive transmission device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded view of a drive transmission device 100 according to an embodiment of the present invention.

  The drive transmission device 100 includes a shaft 110, a pin 120, a first coupling member 130, and a second coupling member 140.

  The shaft 110 mainly supports a rotating body such as a transfer roller. A hole 111 for mounting the pin 120 is formed in the shaft 110. The pin 120 is inserted into the hole 111 and attached in the radial direction of the shaft 110. As will be described later, the pin 120 is made of a rigid body such as metal in order to suppress the rotation of the second coupling member 140. Further, the shaft 110 is configured by a rigid body such as a metal like the pin 120 in order to support the pin 120.

  The first coupling member 130 includes a first cylindrical portion 131 made of an elastic body, passes through the pin 120, is inserted into the shaft 110, and is detachable from the shaft 110. The first coupling member 130 is made of an elastic resin, for example. Since the first coupling member 130 is made of an elastic body, the first coupling member 130 can be elastically deformed when coupled to the second coupling member 140. In addition, the first coupling member 130 is detachable from the shaft 110. However, when the first coupling member 130 is a consumable item, there is an advantage that the first coupling member 130 can be replaced when the first coupling member 130 is worn. .

  The second coupling member 140 includes a second cylindrical portion 141 and a third cylindrical portion 142 having a diameter larger than that of the second cylindrical portion 141 disposed at the distal end portion in the mounting direction on the shaft 110. The second coupling member 140 holds the pin 120 with the second cylindrical portion 141, is detachable from the shaft 110, and is coupled to the first coupling member 130. The second coupling member 140 is detachable with respect to the shaft 110. However, when the second coupling member 140 is a consumable item, there is an advantage that it can be replaced when the second coupling member 140 is worn.

  The pin 120 is inserted into the hole 111 of the shaft 110 in the arrow 151 direction. The first coupling member 130 is inserted through the shaft 110 in the direction of the arrow 152. The second coupling member 140 is attached to the shaft 110 in the arrow 153 direction.

  FIG. 2 is a front perspective view of the first coupling member 130 of the drive transmission device 100 according to the embodiment of the present invention. FIG. 3 is a rear perspective view of the first coupling member 130 of the drive transmission device 100 according to the embodiment of the present invention. FIG. 4 is a front perspective view of the second coupling member 140 of the drive transmission device 100 according to the embodiment of the present invention.

  The first coupling member 130 has a rib 132, a first notch 133, and a long hole 134.

  The rib 132 is formed on the inner peripheral surface of the first cylindrical portion 131. The rib 132 forms a storage space 131A for storing the pin 120, and prevents the first coupling member 130 from being detached from the shaft 110 when the pin 120 is stored in the storage space 131A. That is, the rib 132 prevents the first coupling member 130 from being detached from the shaft 110 by interfering with the pin 120 under a predetermined condition.

  The first notch 133 is formed in the rib 132 and is a notch for storing the pin 120 in the storage space 131A. The first notches 133 are formed in the ribs 132 at intervals of 180 °. The pin 120 can pass through the rib 132 only from the first notch 133. Therefore, if the first coupling member 130 rotates by a predetermined angle in a state where the pin 120 is stored in the storage space 131 </ b> A, the pin 120 cannot pass through the rib 132. This is the predetermined condition.

  The long hole portion 134 is formed along the peripheral surface of the first cylindrical portion 131. The long hole portions 134 are formed at intervals of 180 ° in the first cylindrical portion 131. The first coupling member 130 can be firmly coupled to the second coupling member 140 due to the presence of the elongated hole portion 134.

  The second coupling member 140 has a holding part 143 and a first protrusion 144.

  The holding part 143 is formed in the second cylindrical part 141 and holds the pin 120 to suppress the rotation of the second coupling member 140. Since the holding part 143 is formed in the same shape as the shape of the pin 120, when the pin 120 is fitted, the rotation of the second coupling member 140 is suppressed.

  The first protrusion 144 is formed on the outer peripheral surface of the second cylindrical portion 141, and engages with the long hole portion 134 when the first coupling member 130 is pressed against the second coupling member 140. The first protrusions 144 are formed at 180 ° intervals on the outer peripheral surface of the second cylindrical portion 141. When the first protrusion 144 is engaged with the long hole 134, it cannot be easily removed from the long hole 134.

  The first coupling member 130 has a locking portion 135.

  The locking part 135 is formed at the first end of the long hole part 134 and locks the first protrusion 144. The locking portion 135 is a protrusion formed so as to be separated from the first end of the long hole portion 134 by the width of the first protrusion 144. The locking portion 135 forms a storage space for storing the first protrusion 144 in the long hole portion 134. Therefore, the locking portion 135 can firmly lock the first protrusion 144.

  The first coupling member 130 is rotated by a predetermined angle with respect to the second coupling member 140 in a state where the first projection 144 is engaged with the elongated hole portion 134, so that the first projection 144 is locked. The second coupling member 140 is coupled by reaching the portion 135 and being locked. The first coupling member 130 and the second coupling member 140 are firmly attached to the shaft 110 by sandwiching the pin 120.

  In this configuration, no tool is required when the first coupling member 130 and the second coupling member 140 are coupled. Therefore, it is possible to easily combine the members with each other and to suppress complication of component management.

  In this configuration, the first coupling member 130 and the second coupling member 140 can be firmly coupled to the shaft 110 without any tool. Therefore, a driving force from a driving source (not shown) can be efficiently transmitted to the shaft 110.

  It is preferable that the first coupling member 130 further includes a gripping portion 136.

  The gripping part 136 is formed on the outer peripheral surface of the first cylindrical part 131 in a direction orthogonal to the circumferential direction of the first cylindrical part 131, and is gripped when the first coupling member 130 is coupled to the second coupling member 140. The The gripper 136 is a protrusion that is gripped when the user couples the first coupling member 130 and the second coupling member 140.

  In this configuration, the first coupling member 130 can be easily gripped, so that the first coupling member 130 and the second coupling member 140 can be easily coupled.

  The gripper 136 is preferably formed with a first recess 137 in the longitudinal direction.

  The first recess 137 makes it difficult for the user's finger to slip by hooking the user's finger holding the holding portion 136.

  In this configuration, since the first coupling member 130 can be more easily gripped, the first coupling member 130 and the second coupling member 140 can be easily coupled together.

  It is preferable that the first coupling member 130 further includes a second recess 138.

  The second recess 138 is formed on the inner peripheral surface of the first cylindrical portion 131, and guides the first protrusion 144 to the second end of the long hole portion 134. The second recess 138 is formed from the rear end surface in the insertion direction to the shaft 110 of the first coupling member 130 to the long hole portion 134.

  In this configuration, when the first coupling member 130 and the second coupling member 140 are coupled, the first protrusion 144 can easily reach the long hole portion 134. Therefore, the first coupling member 130 and the second coupling member 140 can be easily coupled.

  The second coupling member 140 preferably further includes a second protrusion 145. Further, the rib 132 is preferably formed with the second notch 139.

  The second protrusion 145 is formed at the free end of the second cylindrical portion 141. The second projecting portions 145 are formed at 180 ° intervals in the second cylindrical portion 141. The second notch 139 is formed so that the second protrusion 145 can pass therethrough. The second notches 139 are formed at intervals of 180 ° in the ribs 132.

  The second protrusion 145 slides with respect to the rib 132 when the first coupling member 130 is rotated by a predetermined angle with respect to the second coupling member 140 in a state of passing through the second notch 139. The first protrusion 144 engages with the rib 132 while being locked to the locking portion 135.

  In this configuration, in addition to the first projecting portion 144 being engaged with the engaging portion 135, the second projecting portion 145 is engaged with the rib 132, so that the first coupling member 130 and the second coupling member are engaged. 140 can be firmly coupled.

  It is preferable that the first protrusion 144 is tapered only on the free end side of the second cylindrical portion 141.

  In this configuration, the first coupling member 130 can be easily elastically deformed when the first protrusion 144 is engaged with the elongated hole 134. Therefore, the first coupling member 130 and the second coupling member 140 can be easily coupled.

  FIG. 5 is a perspective view showing a state where the first coupling member 130 and the second coupling member 140 of the drive transmission device 100 according to the embodiment of the present invention are coupled.

  In this figure, the shaft 110 and the pin 120 are omitted because the shaft 110 is incorporated in the apparatus.

  The third cylindrical portion 142 is preferably formed with a gear 146. The gear 146 may be formed either on the inner peripheral surface of the third cylindrical portion 142 or on the outer peripheral surface.

  In this configuration, since the gear 146 is formed in the third cylindrical portion 142 of the second coupling member 140 that is firmly coupled to the shaft 110, a driving force from a driving source (not shown) is efficiently applied to the shaft 110. Can communicate well.

  The first coupling member 130 and the second coupling member 140 are preferably made of resin.

  In this configuration, when a resin excellent in electrical insulation is used for the first coupling member 130 and the second coupling member 140, a voltage is applied to the rotating body pivotally supported by the shaft 110. In addition, it is possible to prevent a voltage from leaking from the end of the shaft 110 to the apparatus main body.

  Finally, the description of the above-described embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 100-Drive transmission device 110-Shaft 120-Pin 130-1st coupling member 140-2nd coupling member 131-1st cylindrical part 131A-Storage space 132-Rib 133-1st notch part 134-Elongate hole part 135 -Locking part 136-Holding part 137-First recess 138-Second recess 139-Second notch part 141-Second cylindrical part 142-Third cylindrical part 143-Holding part 144-First projecting part 145-Second Projection 146-Gear

Claims (8)

The axis,
A pin mounted in a radial direction of the shaft;
A first coupling member configured by a first cylindrical portion made of an elastic body, passed through the pin, inserted into the shaft, and detachable from the shaft;
A second cylindrical portion disposed at a distal end in the mounting direction of the shaft; and a third cylindrical portion having a diameter larger than that of the second cylindrical portion, the pin being held by the second cylindrical portion, and the shaft A second coupling member that is removable with respect to the first coupling member;
With
The first coupling member is
A rib formed on an inner peripheral surface of the first cylindrical portion, forming a storage space for storing the pin, wherein the first coupling member is formed when the pin is stored in the storage space; A rib that prevents detachment from the shaft;
A first notch formed in the rib for storing the pin in the storage space;
An elongated hole formed along the circumferential surface of the first cylindrical portion;
Have
The second coupling member is
A holding part that is formed in the second cylindrical part and suppresses rotation of the second coupling member relative to the shaft by holding the pin;
A first protrusion that is formed on an outer peripheral surface of the second cylindrical portion and engages with the elongated hole portion when the first coupling member is pressed against the second coupling member;
Have
The first coupling member is formed at a first end portion of the elongated hole portion, and has a locking portion that locks the first protrusion.
The first coupling member is rotated by a predetermined angle with respect to the second coupling member in a state where the first protrusion is engaged with the elongated hole portion, so that the first protrusion is engaged with the engagement member. A drive transmission device coupled to the second coupling member by reaching and stopping the stop. The first coupling member further includes a grip portion formed in a direction orthogonal to the circumferential direction of the first cylindrical portion on the outer peripheral surface of the first cylindrical portion,
The drive transmission device according to claim 1, wherein the grip portion is gripped when the first coupling member and the second coupling member are coupled. The drive transmission device according to claim 2, wherein the grip portion has a first recess formed in a longitudinal direction thereof. The first coupling member further includes a second recess formed on an inner peripheral surface of the first cylindrical portion,
The drive transmission device according to any one of claims 1 to 3, wherein the second recess guides the first protrusion to a second end of the elongated hole. The second coupling member further includes a second protrusion formed at a free end of the second cylindrical portion,
The rib is formed with a second notch through which the second protrusion can pass,
The second protrusion is slid relative to the rib when the first coupling member is rotated by a predetermined angle with respect to the second coupling member in a state of passing through the second notch. The drive transmission device according to claim 1, wherein the first protrusion is engaged with the rib in a state where the first protrusion is engaged with the engagement portion. The drive transmission device according to claim 1, wherein the first protrusion is tapered only on a free end side of the second cylindrical portion. The drive transmission device according to claim 1, wherein a gear is formed on the third cylindrical portion. The drive transmission device according to claim 1, wherein the first coupling member and the second coupling member are made of resin.

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