JP5069957B2 - Rotating body holding structure and sheet conveying apparatus - Google Patents

Description

  The present invention relates to a rotating body holding structure used in a sheet conveying apparatus such as a scanner, a facsimile, a printer, and a copying machine, and a sheet conveying apparatus having the rotating body holding structure.

  In general, in this type of sheet conveying apparatus, as shown in FIG. 6, a sheet conveying path is formed by an upper frame 4 and a lower frame 5, and a conveying roller 1 is rotated by a driving source (not shown). The sheet is conveyed by pressing the sheet D against the conveying roller 1 by the biased pressure roller unit 3.

  As shown in FIGS. 7 and 8, the pressure roller unit 3 includes a roller shaft 33 having a notch surface 33 a at the center in the axial direction, a roller core 32 rotatably supported by the roller shaft 33, and a roller core 32. And a rubber roller 31 to be fixed.

Further, as shown in FIG. 8, the pressure roller unit 3 is supported by the roller shaft 33 sandwiched between rib-shaped portions 4a formed on the members constituting the upper frame 4, and detached from the upper frame 4 by the stopper portions 4b. A stop is made. The notch surface 33a of the roller shaft 33 is pressed by the compression spring 2, which restricts the rotation of the roller shaft 33 and the movement of the roller shaft 33 in the axial direction (for example, Patent Document 1). reference).
JP 7-48047 A

  However, when the conventional pressure roller unit 3 is attached, as shown in FIG. 9, the roller shaft 33 is inclined and one end thereof is inserted into the stopper portion 4b from the conveyance path side, and then the other end of the roller shaft 33 is inserted. Since the roller shaft 33 needs to be moved in the axial direction (arrow s direction) after being pushed in the direction of the arrow r (FIG. 9A) (FIG. 9B), the mounting work is troublesome. In particular, when the roller shaft 33 is moved in the axial direction (FIG. 9B), the space for putting the finger and gripping the roller shaft 33 is narrow, so that the work takes time.

  Also, the operation of removing the pressure roller unit 3 is similarly troublesome, and there is a problem that it takes time to replace the pressure roller unit 3 during maintenance and inspection.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating body holding structure and a sheet conveying apparatus capable of facilitating the attaching and detaching operations of a shaft member in a state where the rotating body is rotatably supported.

In order to achieve the above object, the rotating body holding structure of the present invention is arranged so as to protrude from one of the two frames forming the sheet conveying path toward the conveying path and to convey the sheet. a holding structure, a shaft member for rotatably supporting the rotating body, a holding member for holding the shaft member, and a locking portion provided on the holding member, the frame member before Symbol hand and the engaged portion and the engagement portion that is engaged is provided, wherein provided between the one of the frame and the shaft member and a spring member for urging said shaft member to said conveying path, said One end portion of the shaft member held by the holding member is provided with a notch surface, and the holding member is provided with a rotation stop portion that contacts the notch surface and restricts the rotation of the shaft member. cage, the locking portion, the relative to the shaft member It biasing force of the member is engaged with the engaged portion is applied, characterized in that.

The rotating body holding structure of the present invention is a holding structure for a rotating body that is arranged to protrude from one of the two frames forming the sheet conveying path toward the conveying path and conveys the sheet. A shaft member for rotatably supporting the body, a holding member for holding the shaft member, a locking portion provided on the holding member, and the locking portion provided on the one frame member. One end portion of the shaft member that is held by the holding member, and includes a locked portion, and a spring member that is provided between the one frame and the shaft member and biases the shaft member toward the conveyance path. Is provided with a notch surface, and the holding member is provided with a rotation stopper that abuts the notch surface and restricts the rotation of the shaft member, and the one frame includes the shaft member. The other end opposite to the one end side of A stopper portion that is inserted and restricts the shaft member from moving toward the conveyance path, and is provided with a stopper portion. In the state where the rotation of the shaft member is restricted by the rotation stop portion of the holding member so that the one frame holds the one of the frames, the urging force of the spring member is applied to the locking member with respect to the shaft member. And is locked to the locked portion .

  According to the present invention, when the shaft member in a state in which the rotating body is rotatably supported is attached to the frame member, the operation of moving the shaft member in the axial direction as in the prior art becomes unnecessary. It is possible to facilitate the mounting operation of the rotating body unit including the members.

  In addition, since the work of removing the rotating body unit from the frame member can be easily performed, the replacing work of the rotating body unit at the time of maintenance and inspection can be performed in a short time, and the replacement cost can be reduced.

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

(First embodiment)
First, a roller (rotating body) holding structure according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of a pressing roller unit to which a roller holding structure according to a first embodiment of the present invention is applied, as viewed from the sheet conveying direction, FIG. 2 is a view as viewed from the lower side of FIG. 1, and FIG. FIG. 4 is a cross-sectional view for explaining details of the holding member, and FIG. 4 is an explanatory view for explaining a method of attaching the pressure roller unit. Note that portions overlapping or corresponding to the conventional roller holding structure already described with reference to FIGS. 6 to 9 will be described with reference numerals.

  As shown in FIG. 1 and FIG. 2, the pressure roller unit 3A to which the roller holding structure of the present embodiment is applied has a roller shaft having flat cutout surfaces 33a that are opposed to each other in the radial direction at one end in the axial direction. (Shaft member) 33, a roller core 32 rotatably supported by the roller shaft 33, and a rubber roller (rotating body) 31 fixed to the roller core 32. The central portion of the roller shaft 33 in the axial direction is pressed against the conveyance path side by the compression spring 2, and thereby the rubber roller 31 is urged so as to come into pressure contact with the opposite conveyance roller 1 across the conveyance path.

  Further, as shown in FIG. 2, in the pressure roller unit 3 </ b> A, the roller shaft 33 is supported by being sandwiched between substantially U-shaped rib-shaped portions 4 a provided on members constituting the upper frame 4.

  The end of the roller shaft 33 where the notch surface 33a is not provided abuts against a stopper portion 4b provided on a member constituting the upper frame 4, thereby causing movement toward the conveyance path and movement in the axial direction. It is regulated and prevented from coming off. Further, the end portion of the roller shaft 33 provided with the notch surface 33a is held by the upper frame 4 via the holding member 6, and similarly the movement toward the conveyance path and the movement in the axial direction are restricted to prevent the roller shaft 33 from coming off. Is done.

  The holding member 6 is formed of an elastic resin material or the like, and as shown in FIGS. 2 and 3, for example, a square flange-like stopper portion 6a and one end surface of the stopper portion 6a in the thickness direction of the stopper portion 6a. A pair of extended elastic pieces 6c. In addition, although the elastic piece 6c is made into a pair, one piece may be sufficient.

  The pair of elastic pieces 6c are formed so that the distance gradually increases toward the extending end, and the notch surfaces 33a of the roller shaft 33 are provided in the radial direction on the inner surfaces on the base side of the pair of elastic pieces 6c. An anti-rotation portion 6b that sandwiches and restricts the rotation of the roller shaft 33 is formed.

  In the state where the notch surface 33a of the roller shaft 33 is sandwiched in the radial direction by the rotation stopper 6b, the stopper 6a restricts the movement of the end of the roller shaft 33 on the side of the notch surface 33a toward the conveyance path. Further, the movement of the end portion of the roller shaft 33 toward the upper frame 4 side is restricted by the protruding portion provided on the upper portion in FIG. 3 of the stopper portion 6a.

  Further, at the extended ends of the pair of elastic pieces 6c, there are locking claws (locking portions) 6e locked to the peripheral edge portions of the locking holes (locked portions) 4c provided in the upper frame 4, respectively. Is formed. Then, when the locking claw 6e is inserted into the locking hole 4c while elastically deforming the pair of elastic pieces 6c toward each other, and the locking claw 6e passes through the locking hole 4c, the pair of elastic pieces 6c. Tries to restore elasticity.

  At this time, the pair of elastic pieces 6c hit the inner peripheral surface of the locking hole 4c before being completely elastically restored, and the locking claws 6e are locked in a state where a biasing force is applied by the elastic restoring force of the elastic piece 6c. Locked to the peripheral edge of the hole 4c. As a result, the end of the roller shaft 33 provided with the notch surface 33 a is held by the upper frame 4 via the holding member 6. In addition, you may comprise so that the elastic piece 6c may be elastically restored completely, and the elastic piece 6c may contact | connect the inner peripheral surface of the locking hole 4c substantially simultaneously.

  When attaching the pressure roller unit 3A to the upper frame 4, as shown in FIG. 4, the end of the roller shaft 33 that is not provided with the notch surface 33a is inclined from the conveyance path side to the stopper portion of the upper frame 4 as shown in FIG. Plug in 4b.

  Next, after the end portion of the roller shaft 33 provided with the notch surface 33a is pushed in the direction of the arrow r, as described above, the roller shaft so that the rotation preventing portion 6b of the holding member 6 is in contact with the notch surface 33a. In a state where 33 is sandwiched, the locking claw 6e of the holding member 6 is inserted into the locking hole 4c of the upper frame 4 and locked to the peripheral edge of the locking claw 4c.

  The rubber roller 31 held in this way is movable within a predetermined range when pressed from the conveyance path side.

  When removing the pressure roller unit 3A from the upper frame 4, as shown in FIG. 3, a tool such as tweezers P is inserted into the two long hole-shaped tool insertion portions 6d formed in the stopper portion 6b of the holding member 6. Is inserted, the pair of elastic pieces 6c are elastically deformed against the elastic restoring force in the direction in which the pair of elastic pieces 6c approach each other at the tip of the tweezers P, and the locking claw 6e is pulled out from the locking hole 4c, whereby the pressure roller unit 3A Can be easily removed from the upper frame 4.

  As described above, in this embodiment, when the pressure roller unit 3A is attached to the upper frame 4, the operation of moving the roller shaft 33 in the axial direction as in the prior art becomes unnecessary. The attachment work can be facilitated.

  Further, since the operation of removing the pressure roller unit 3A from the upper frame 4 can be easily performed, the replacement operation of the pressure roller unit 3A at the time of maintenance and inspection can be performed in a short time, and the replacement cost can be reduced. it can.

  Further, since the pressure roller unit 3A is attached to the upper frame 4 from the conveyance path side, it is not obstructed by various parts such as electric parts mounted in the vicinity of the pressure roller unit 3a, and the pressure roller unit 3A is attached. The removal work can be performed more easily.

  The tool insertion part 6d such as tweezers P may be provided not on the holding member 6 side but on the upper frame 4 side, and a gap formed between the holding member 6 and the upper frame 4 is used instead of the hole. May be used.

(Second Embodiment)
Next, a roller (rotating body) holding structure according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic view of a pressing roller unit to which a roller holding structure according to a second embodiment of the present invention is applied, viewed from the sheet conveying direction. Note that portions that overlap or correspond to those in the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  As shown in FIG. 5, the pressure roller unit 3 </ b> B to which the roller support structure of the present embodiment is applied is formed with notched surfaces 33 a at both ends of the roller shaft 33, and both ends of the roller shaft 33 are held by holding members. 6 is held by the upper frame 4. Further, the holding members 6 disposed on both end sides of the roller shaft 33 are connected and integrated with each other by a connecting portion 6e.

  In this embodiment, when the pressure roller unit 3A is attached to the upper frame 4, the engaging claws 6e of the two holding members 6 are engaged with the members constituting the upper frame 4 from the conveyance path side without tilting the roller shaft 33. Since it is only necessary to insert it into the stop hole 4c, it is possible to further facilitate the operation of attaching the pressure roller unit 3A. Note that three or more holding members 6 may be used to hold the roller shaft 33 at three or more locations. Other configurations and operational effects are the same as those of the first embodiment.

  In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in each of the above embodiments, the holding structure for the pressure roller unit is illustrated, but the present invention is not limited to this, and the present invention may be applied to the holding structure for the transport roller 2 and other rotating bodies.

  Moreover, although each said embodiment illustrated the case where the latching claw 6e was provided in the holding member 6 side, and the latching hole 4c in which the latching claw 6e was latched was provided in the member side which comprises the upper frame 4, was illustrated. Instead of this, a locking claw may be provided on the member side constituting the upper frame 4, and a locking hole for locking the locking claw on the member side constituting the upper frame may be provided on the holding member 6 side. .

  Furthermore, in each said embodiment, although the case where the latching claw 6e was latched to the latching hole 4c using the elastic force of a pair of elastic piece 6c formed with resin etc. was illustrated, instead of this, The locking claw 6e may be locked in the locking hole 4c using an elastic force such as a spring provided separately.

  Furthermore, in each said embodiment, although the latching structure of the latching claw 4 and the latching hole 4c was illustrated, it is not limited to this, For example, latching structure by uneven | corrugated fitting etc., and other latching structures, for example May be used.

  In each of the above embodiments, the notch surface 33a provided at the end of the roller shaft 33 is sandwiched by the rotation stop portion 6b provided on the holding member 6 to restrict the rotation of the roller shaft 33. Thus, the rotation of the roller shaft 33 may be regulated by providing a notch surface 33a in a portion sandwiched between the rib-shaped portions 4a of the roller shaft 33 and sandwiching the notched surfaces 33a with the rib-shaped portions 4a.

  Further, in each of the above embodiments, the present invention is applied to the roller provided on the upper frame 4 side. However, the present invention is applied to the roller provided on the lower frame 5 side or the rollers provided on both the frames 4 and 5. May be. The present invention may also be applied to a sheet conveying apparatus having a structure in which a roller is attached from the opposite side of the conveying path.

It is the schematic which looked at the pressure roller unit to which the roller holding structure which is the 1st Embodiment of this invention is applied from the conveyance direction of a sheet | seat. It is the figure seen from the lower side of FIG. It is sectional drawing for demonstrating the detail of a holding member. It is explanatory drawing for demonstrating the attachment method of a press-contact roller unit. It is the schematic which looked at the pressure roller unit to which the roller holding structure which is the 2nd Embodiment of this invention is applied from the conveyance direction of the sheet | seat. It is a schematic sectional drawing which shows an example of a sheet conveying apparatus. It is the schematic which looked at the conventional press-contact roller unit from the conveyance direction of the sheet. It is the figure seen from the lower side of FIG. It is explanatory drawing for demonstrating the attachment method of the conventional press-contact roller unit.

Explanation of symbols

D Document P Tweezers (tool)
DESCRIPTION OF SYMBOLS 1 Conveyance roller 2 Compression spring 3A Pressure roller unit 3B Pressure roller unit 4 Upper frame 4a Rib shape part 4b Stopper part 4c Locking hole (locked part)
5 Lower frame 6 Holding member 6a Stopper part 6b Anti-rotation part 6c Elastic piece 6d Tool insertion part 6e Locking claw (locking part)
31 Rubber roller (rotating body)
32 Roller core 33 Roller shaft (shaft member)
33a Notched surface

Claims (6)

A holding structure for a rotating body that is arranged to project from one of two frames forming a sheet conveyance path toward the conveyance path and conveys the sheet,
Wherein a shaft member for rotatably supporting the rotating body, a holding member for holding the shaft member, and a locking portion provided on the holding member, before Symbol the locking provided on one hand frame member of the comprising a the locked portion part is that engaged, and a spring member for urging said shaft member provided between said one frame and said shaft member to said conveying path,
One end portion of the shaft member held by the holding member is provided with a notch surface, and the holding member is provided with a rotation stop portion that contacts the notch surface and restricts the rotation of the shaft member. And
The rotating part holding structure according to claim 1, wherein the locking part is locked to the locked part by applying a biasing force of the spring member to the shaft member . A holding structure for a rotating body that is arranged to project from one of two frames forming a sheet conveyance path toward the conveyance path and conveys the sheet,
A shaft member that rotatably supports the rotating body, a holding member that holds the shaft member, a locking portion that is provided on the holding member, and a locking portion that is provided on the one frame member and that is locked. And a spring member that is provided between the one frame and the shaft member and biases the shaft member toward the conveyance path.
One end portion of the shaft member held by the holding member is provided with a notch surface, and the holding member is provided with a rotation stop portion that contacts the notch surface and restricts the rotation of the shaft member. And
The one frame is provided with a stopper portion that is inserted into the other end portion opposite to the one end portion side of the shaft member and serves as a retaining member that restricts the shaft member from moving toward the conveyance path.
In a state in which the rotation of the shaft member is restricted by the rotation stopping portion of the holding member so that the one end side of the shaft member is held by the one frame after the other end portion of the shaft member is inserted into the stopper portion. , the locking portion, said shaft biasing force of the spring member is engaged with the engaged portion is given to members, rotating body holding structure you wherein a. The holding member can be attached to the one frame from the conveyance path side;
The tool insertion part which enables the operation by the tool from the said conveyance path side in order to displace the said latching part against the said urging | biasing force and to detach | leave from the said to-be-latched part is provided. The rotating body holding structure according to 1 or 2. The rotating body according to any one of claims 1 to 3, wherein the holding members are arranged at both ends of the shaft member in the axial direction, and the holding members are connected via connecting portions. Retaining structure. The axial end of the shaft member is directly held by the frame member, and the other axial end of the shaft member is held by the frame member via the holding member. The rotating body holding structure according to any one of 1 to 3. A sheet conveying apparatus that conveys a sheet from a frame out of two frames forming a sheet conveying path by means of a rotating body arranged to protrude toward the conveying path,
A sheet conveying apparatus using the rotating body holding structure according to any one of claims 1 to 5 as a holding structure of a shaft member that rotatably supports the rotating body.

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