JP2909969B2 - Image forming device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image forming apparatus provided with a peeling claw for peeling a transfer material from a rotating body.

2. Description of the Related Art In an image forming apparatus such as an electrophotographic copying machine, a rotating body such as a photosensitive drum or a fixing roller disposed in a transfer material conveying path generally assists in peeling of the transfer material from the rotating body. A peeling claw is provided. The exfoliation claw is formed to have a sharp tip at the tip thereof for peeling the transfer material which is in close contact with the rotating body, and the tip is pressed against the rotating body. Therefore, this sharp tip of the peeling claw is liable to damage the rotating body, so that the peeling claw reciprocates in the axial direction of the rotating body with the rotation of the rotating body so that the peeling claw does not always contact the same place of the rotating body. In general, a type in which the rotating body is prevented from being damaged by the peeling claw is generally used.

On the other hand, the peeling claw is generally made of a relatively soft material such as resin to suppress damage to the rotating body. Therefore, if the peeling claw is kept in sliding contact with the rotating body for a long period of time, it may be worn or the tip may be chipped, so that it is desired that the peeling claw can be easily replaced.

In addition, if the rotating body and its surrounding parts, for example, the rotating body is a photosensitive drum, if the maintenance is performed without removing the peeling claw during maintenance of the photosensitive drum itself and a charger and a cleaner, a work space is increased. In addition, the maintenance work is difficult, and the hand or the like may hit the peeling claw and damage the rotating body. In this respect, it is desired that the peeling claw can be easily removed.

(Problems to be Solved by the Invention) However, since each of the peeling claws is very small and the peeling nails are disposed inside the apparatus main body, it is impossible to remove one peeling nail from the apparatus. Have difficulty. Therefore, it is only necessary to remove the peeling claw together with the holder supporting the peeling claw from the apparatus main body, and to replace the peeling claw. Is disposed around the peeling claw, and it is difficult to remove the peeling claw together with the holder.

The present invention has been made in view of the above-described problems, and the object thereof is to easily remove a holder or the like including a peeling claw,
An object of the present invention is to provide an image forming apparatus that can be attached.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rotating member provided in a transfer material conveying path, a separating claw for separating a transferring material from the rotating member, and a separating claw. An image forming apparatus comprising: a holder for supporting the rotating shaft; and a supporting plate for supporting the rotating shaft, the rotating shaft rotating for transmitting a driving force for reciprocating the holder in the axial direction of the rotating body. The unit including the peeling claw, the holder, and the rotating shaft can be detachably attached to the apparatus main body without moving the support plate.

(Operation) According to the present invention, since the unit including the peeling claw, the holder, and the rotating shaft is detachably attached to the apparatus main body without moving the support plate, the replacement of the peeling claw is facilitated and the rotation is performed. Maintainability around the body is improved.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings, taking a copying apparatus as an example of an image forming apparatus.

FIG. 1 is a side sectional view around a peeling claw unit of a copying apparatus,
FIG. 2 is a plan cross-sectional view around the peeling claw unit of the copying apparatus, FIG. 3 is a view taken along the line II of FIG. 2, FIG. 4 is a view showing the movement of the reciprocating cam and the holder, and FIG. FIG. 6 is a diagram showing a state in which the peeling claw unit is taken out of the copying machine main body, FIG. 6 is a diagram showing a state in which the peeling claw unit is being assembled into the copying machine main body, and FIG. 7 is a side sectional view of the copying machine.

First, an outline of a copying apparatus incorporating a peeling claw unit according to the present invention will be described with reference to FIG. The copying apparatus is a copying apparatus capable of performing double-sided copying or multiplex copying. In the figure, reference numeral 10 denotes a photosensitive drum for forming an electrostatic latent image of a document image incident from an image exposure unit 15; A primary charger 11 for applying a uniform primary charge to the surface of the photosensitive drum 10
A developing device 12 for developing the electrostatic latent image on the photosensitive drum 10 to make it visible; a transfer charger 13 for transferring the developed image developed on the photosensitive drum 10 to a transfer material P; A cleaning device 14 for cleaning excess developer on 10 and the like;
A peeling unit 30 and the like for peeling the transfer material P from the photosensitive drum 10 are provided.

Further, on the right side of the photosensitive drum 10 in the figure, sheet cassettes 16 and 17 for storing the transfer material P, paper feed rollers 18 and 19 for taking out the transfer material P from the sheet cassettes 16 and 17, and a developed image of the photosensitive drum 10 A registration roller 20 for adjusting the timing of the transfer material P and the transfer material P is provided. On the left side of the photosensitive drum 10 in FIG. A fixing device 22 including a pair of fixing rollers 22a, 22a and the like for fixing the developed image on the transfer material P, and a fixing device 22 for feeding the transfer material P to any one of the discharge conveyance path C and the re-feed conveyance path B One flapper 23 is provided.

An intermediate stocking device including a second flapper 24, a re-feeding intermediate tray 25, a re-feeding roller 26 and the like is provided in the re-feeding conveyance path B, and is used for double-sided copying and multiple copying. As described above, the present apparatus includes the sheet cassettes 16 and 17, the registration rollers 20, the photosensitive drum 10, the fixing device 22, and the first flapper 23.
Transfer material path A, a transfer material path C for the transfer material P, and a re-feed material path B for the transfer material P. Reference numeral 27 denotes a document table, and reference numeral 28 denotes a scanning system that exposes a document image to the photosensitive drum 10. Next, the configuration of the peeling claw unit 30 according to the present invention disposed around the photosensitive drum 10 will be described with reference to FIGS. The main part of the peeling claw unit 30 is the photosensitive drum 10
And a holder 32 that holds the peeling claw 31 and is disposed along the axial direction of the photosensitive drum 10, and the holder 32 is attached to the apparatus main body. It comprises a rotating shaft 33 slidably supported, and a reciprocating cam 34 fixed coaxially to the rotating shaft 33 and reciprocating the holder 32 in the axial direction of the photosensitive drum 10.

The holder 32 holds the cleaning device 14 as shown in FIG.
Is disposed in an L-shape with respect to the photosensitive drum 10 so as to enclose the
The peeling claw 31 is provided between the support protrusions 32a at the left end of the holder 32 in the drawing.
Are pivotally supported vertically. Upper end of the peeling claw 31
31a is biased elastically obliquely downward by a spring member 35 one end of which is supported by the holder 32, so that a sharp tip 31b disposed at the lower end of the peeling claw 31 is pressed against the photosensitive drum 10, Four sets of the peeling claws 31 are mounted on the holder 32 along the axial direction of the photosensitive drum 10 as described above. holder
As shown in FIG. 2, a support portion 32c supported by a rotating shaft 33 disposed in parallel to the photosensitive drum 10 is provided on one of the inner sides of the rising portion of the holder 32. The holder 32 is provided via the support portion 32c. Is supported on the rotating shaft 33 so as to be slidable in the axial direction.
A similar support portion 32d is provided on the side of the reciprocating cam 34 inside the rising portion of the holder 32. The support portion 32d has an engagement end 32e projecting downward as shown in FIG. The engagement end 32e is provided with a guide groove 34a of the reciprocating cam 34.
Are slidably engaged with.

As shown in FIG. 1 or 3, one end of the apparatus main body 1 is supported by the apparatus main body 1 between the apparatus main body 1 and the upper protruding part 32f of the support part 32d of the holder 32. A pressure spring 36 for pressing leftward in FIG. 1 is provided, and the peeling claw 3 provided at the end of the horizontal portion of the holder 32 by the pressure spring 36 is provided.
Are pressed toward the photosensitive drum 10, and the protrusion 32b provided upward in the horizontal portion of the holder 32 abuts against the bottom of the cleaning device 14, and the holder 32 is positioned around the rotation shaft 33. I have.

A drive input gear 37 is fixed to one end of the rotary shaft 33 as shown in FIG. 2, and a concentric protruding end 37a of the drive input gear 37 with the rotary shaft 33 is provided in the support hole 2a of the apparatus body side plate 2. It is rotatably inserted, one end of a rotating shaft 33 is supported by the apparatus main body 1, and this drive input gear 37 meshes with a drive gear 27a of a rotary drive source 27 attached to the apparatus main body 1 and rotates in a certain direction. Driven. Two stoppers 38, 39 are fixed to the other end of the rotating shaft 33. A bearing 40 of the rotating shaft 33 is slidable in the axial direction of the rotating shaft 33 between the stoppers 38, 39. The outer periphery of the bearing 40 is inserted into the support hole 3a of the other side plate 3 of the apparatus main body, and the other end of the rotating shaft 33 is supported by the apparatus main body 1. The lower portion of the support hole 3a of the apparatus body side plate 3 on the bearing 40 side is opened downward as shown in FIG. 1, and the opening width a is smaller than the outer diameter of the bearing 40 and smaller than the outer diameter of the rotating shaft 33. It is largely configured.

The right part in FIG. 2 of the bearing 40 is a flange part projecting in the circumferential direction.
40a and the stopper 3 on the right side of the rotating shaft 33 in the drawing.
Since the spring member 41 is compressed between the bearing 9 and the bearing 40, the flange 40 a of the bearing 40 is pressed against the apparatus main body side plate 3 via the spring member 41. Accordingly, the entire rotating shaft 33 is urged to the right in FIG. 2, but since the stopper surface 37b of the drive input gear 37 is in contact with the apparatus main body side plate 2, the rotating shaft 3
3 will be positioned in its axial direction.

Thus, when the drive gear 27a is rotated by the rotary drive source 27 as shown in FIG. 2, the rotating shaft 33 is also rotated as shown, and accordingly, as shown in FIGS. 4 (a) to (d). With the rotation of the reciprocating cam 34, the engaging portion 32e of the holder reciprocates in the axial direction of the rotating shaft 33 as shown in the figure, so that the holder 32 of the holder 32 slides in the axial direction of the rotating shaft 33. Are reciprocated in the axial direction of the photosensitive drum 10.

Next, a procedure for attaching the peeling claw unit 30 to the apparatus main body 1 will be described with reference to FIGS. 1, 2, 5, and 6. FIG.

The peeling claw unit 30 includes the peeling claws 31,.
2, the rotary shaft 33, the reciprocating cam 34 and the like are assembled as a unit as shown in FIG. 5, so that the unit can be mounted on the apparatus main body 1 as well. First, as shown in FIG.
The protruding end 37a of the drive input gear 37 is inserted into 2a. Then bearing 4
0 is moved by compressing the spring member 41 to the right in the drawing, and the rotating shaft 33 between the stopper 38 and the bearing 40 is inserted into the support hole 3a from below the apparatus body side plate 3 and then the bearing is inserted into the support hole 3a. If the flange 40a is inserted into the apparatus main body side plate 3 by a spring member 41 as shown in FIG. 2, the rotary shaft 33 is pushed rightward in FIG. Stopper surface 37b
Is pressed by the apparatus main body side plate 2 and the drive input gear 37
And the drive gear 27a are engaged with each other, and the peeling claw unit 30 is positioned vertically and longitudinally.

Then, when the upper protruding portion 32f of the holder 32 is elastically urged rightward in FIG. 1 by the pressure spring 36, the peeling claws 31,... Are pressed against the photosensitive drum 10, and the holder protruding portion 32b is Abuts on the lower surface of the rotating claw unit 14 and
After the surroundings are positioned, the attachment of the peeling claw unit 30 to the apparatus main body is completed. When the peeling claw unit 30 is detached from the apparatus main body, the operation may be performed in a completely reverse procedure.

As described above, the peeling claws 31,..., The holder 32, the rotating shaft 33, the reciprocating cam 34, and the like are assembled in advance as the unit 30,
Since the unit 30 can be attached to and detached from the apparatus main body 1 with one touch, replacement of the peeling claws 31,... Becomes easy, and maintenance around the photosensitive drum 10 can be easily performed by removing the peeling claw unit 30. The work becomes easy, and there is no possibility that the photosensitive drum 10 or the like may be damaged by the peeling claws 31,.

In the above embodiment, the peeling claw unit 30 is a photosensitive drum.
Although the description has been given of the case where the fixing claw is attached to the fixing device 10, the present invention is not limited thereto.
Needless to say, any rotating body may be used as long as 31,... Are required.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the unit including the peeling claw, the holder, and the rotating shaft can be detachably attached to the apparatus main body without moving the support plate. It is possible to obtain an effect that the replacement of the peeling claw is facilitated and the maintenance property around the rotating body is enhanced.

[Brief description of the drawings]

FIG. 1 is a side sectional view around the peeling claw unit of the copying apparatus, FIG. 2 is a plan sectional view around the peeling claw unit of the copying apparatus, and FIG.
FIG. 4 is a diagram showing the movement of the reciprocating cam and the holder, FIG. 5 is a diagram showing the movement of the reciprocating cam and the holder, FIG. FIG. 7 is a side sectional view of the copying apparatus, showing a state in which the peeling claw unit is about to be incorporated into the copying apparatus main body. 2, 3 ... apparatus body side plate (apparatus body support), 10 ... photosensitive drum (rotating body), 22a ... fixing roller (rotating body), 27
... Rotary drive source (drive means), 31 ... Peel off claw, 32 ... Holder, 33 ... Rotary shaft, 34 ... Reciprocating cam, 40 ... Bearing.

Claims (7)

(57) [Claims] 1. An image forming apparatus comprising: a rotating member provided in a transfer material conveying path; a separating claw separating a transfer material from the rotating member; and a holder supporting the separating claw. A rotating shaft that rotates to transmit a driving force for reciprocating in the axial direction of the rotating body, and a supporting plate that supports the rotating shaft, and the apparatus main body is moved without moving the supporting plate. An image forming apparatus, wherein a unit including the peeling claw, the holder, and the rotating shaft is detachable. 2. The apparatus according to claim 1, wherein the unit is provided with a cam provided on the rotating shaft for changing a rotating force of the rotating shaft into a force for reciprocating the holder in the axial direction.
The image forming apparatus as described in the above. 3. The image forming apparatus according to claim 1, wherein the unit includes a bearing that supports the rotation shaft with the support plate. 4. The image forming apparatus according to claim 3, wherein the unit includes an urging member for urging the bearing toward an axial end of the rotating shaft. 5. A plurality of peeling claws are provided, and the plurality of peeling claws are supported by the holder.
5. The image forming apparatus according to 1, 2, 3, or 4. 6. An image forming apparatus according to claim 1, wherein said rotator is an image carrier for carrying an image. 7. An image forming apparatus according to claim 1, wherein said rotating body is a fixing roller for fixing an image on a transfer material.