JP2006133418A - Fixing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize constitution where a peeling claw for peeling recording paper from the outer circumferential surface of a heat roller is easily attached to/detached from a peeling claw attaching member having a bearing part for bearing its turning shaft, the prevention of the peeling claw attached to the peeling pawl attaching member from being tilted in a turning shaft direction and the reduction of cost thereof. <P>SOLUTION: The fixing unit 1 where the peeling claw 2 is constituted so that the turning shafts 2e and 2e at both side parts of the peeling claw may be attachably/detachably attached to the bearing parts 3e and 3e of the peeling claw attaching member 3 in a direction orthogonal to the turning shaft 2e is provided with a pair of regulating ribs 4b and 4b having a gap a little larger than the thickness of the end on a side opposite to the claw of a peeling claw main body, in the turning shaft direction of the peeling claw 2 at an arranging position obtained by leaving space wider than the diameter of the turning shaft 2e of the peeling part 2 from the peeling claw attaching member 3, in a direction where the turning shafts 2e and 2e of the peeling claw 2 are detached from the bearing parts 3e and 3e, and constituted so that the end on the side opposite to the claw of the peeling claw body 2a attached to the peeling claw attaching member 3 is inserted in the gap. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing device including a peeling claw for peeling a recording sheet from an outer peripheral surface of a heat roller.

Conventionally, a heat roller having a heat source and a press roller press-contacted to the heat roller are provided, and a recording paper with an unfixed toner image is fed between the rollers to heat and press the toner. A fixing device for fixing an image is known. This fixing device is provided with a peeling claw urged in the direction of pushing the outer peripheral surface of the heat roller, and the recording paper wound around the heat roller is peeled off from the outer peripheral surface of the heat roller by the presence of molten toner by the peeling claw. (For example, refer patent document 1).
Japanese Patent Laid-Open No. 7-64431

  The peeling claw may be tilted in the direction of its rotation axis by receiving a force from a heat roller or a recording paper wound around the heat roller, and if it is greatly inclined, the rotation axis of the peeling claw may be detached from the bearing member. The fixing device disclosed in Patent Document 1 is also configured to prevent the peeling claw from inclining in the direction of the rotation axis. The concave portion formed on one side of the center is fitted to the rotating shaft, and in order to remove this peeling claw, judging from the structure described in FIG. 1 and FIG. After removing the rotating shaft from the frame, slide the peeling claw that fits into the rotating shaft in the direction of the rotating shaft and remove it from one end of the rotating shaft, or pull the peeling claw strongly toward the heat roller. For example, if the recess of the peeling claw and the rotation shaft are disengaged, the heat roller must be removed from the frame, and then the peeling claw must be removed from the rotation shaft. Removal of peeling nails is difficult and not easy Going on. This peeling claw is urged in the direction of pushing the outer peripheral surface of the heat roller, and is constantly in sliding contact with the heat roller, so it also wears, so it needs to be replaced periodically, also from the viewpoint of maintenance, It is desirable that the peeling claw has a structure that can be easily attached and detached.

  Therefore, in the present invention, in view of such a point, the separation claw can be easily attached to and detached from the bearing member that receives the rotation shaft, and the separation claw attached to the bearing member is in the direction of the rotation axis. It is an object of the present invention to provide a fixing device that is prevented from being inclined to the right. Furthermore, in the present invention, it is an object of the present invention to reduce costs in providing a fixing device having such a configuration.

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
First, as described in claim 1, a peeling claw for peeling the recording paper from the outer peripheral surface of the heat roller, and a rotation shaft on both sides of the peeling claw are detachably attached in a direction perpendicular to the rotation axis. A fixing member provided with a bearing member, wherein the bearing member is spaced apart from the bearing member by a distance larger than the diameter of the turning shaft of the peeling claw in a direction of removing the turning shaft of the peeling claw from the bearing member. At the opened position, there is a gap slightly wider than the wall thickness of the peeling claw body on the side opposite to the claw in the rotation axis direction of the peeling claw body, and the peeling claw body attached to the bearing member in the gap. A fixing device having a restricting member into which an end portion on the side opposite to the claw is inserted.

  According to a second aspect of the present invention, the restricting member is a pair of ribs that are arranged to face each other with the gap therebetween.

  According to a third aspect of the present invention, the restricting member is formed integrally with the fixing device main body frame.

Since the present invention is configured as described above, the following effects can be obtained.
In the first aspect of the present invention, when the peeling claw is attached to the bearing member, the rotation axis of the peeling claw is passed between the regulating member side end of the bearing member and the bearing member side end of the regulating member. When inserting into the bearing portion and removing the peeling claw from the bearing member, after removing the rotation shaft of the peeling claw from the bearing portion of the bearing member, the bearing member end of the bearing member and the bearing member of the regulating member It can be removed between the side ends, and the peeling claw can be easily attached to and detached from the bearing member, thereby improving workability.
Also, the peeling claw attached to the bearing member is inserted into the gap of the regulating member at the end opposite to the claw side of the main body, thereby preventing the peeling claw from being displaced or inclined in the rotation axis direction. The reliability is improved without worrying about detachment from the bearing member.

According to the second aspect of the present invention, when the peeling claw is attached to the bearing member, the rotation shaft of the peeling claw is passed between the rib side end of the bearing member and the bearing member side end of the pair of ribs. When inserting into the bearing part and when removing the peeling claw from the bearing member, after removing the rotating shaft of the peeling claw from the bearing part of the bearing member, the bearing side of the rib side end of the bearing member and the pair of rib bearing members It can be removed between the side ends, and the peeling claw can be easily attached to and detached from the bearing member, thereby improving workability.
Also, the peeling claw attached to the bearing member is inserted into the gap between the pair of ribs at the end on the opposite side of the main body, thereby preventing the peeling claw from being displaced or tilted in the direction of the rotation axis. The reliability is improved without worrying that the peeling claw is detached from the bearing member.

  In the invention according to claim 3, since the regulating member is formed integrally with the fixing device main body frame, it is not necessary to fasten both members with screws or the like, the number of parts is reduced, and the cost is reduced. Can be achieved.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, the fixing device 1 provided in an image forming apparatus such as a copying machine or a facsimile machine will be described with reference to FIGS.
The fixing device 1 is energized in a direction to press the heat roller 11, a heat roller 11 in which a lamp heater such as a halogen lamp is incorporated as a heat source, a press roller 12 in pressure contact with the heat roller 11, and the heat roller 11. The fixing device 1 includes a main body of the image forming apparatus and a jam access cover that can be opened with respect to the main body of the image forming apparatus. It is configured to be detachably mounted between them. When the fixing device 1 is mounted on the image forming apparatus main body, the nip portion between the heat roller 11 and the press roller 12 is arranged along the first recording paper transport path (main transport path), and the fixing device 1 The second recording paper conveyance path (paper surface reversal path) is formed between the outer side of the paper and the inner side of the jam access cover.

  The main body frame of the fixing device 1 is formed of a synthetic resin or the like, and the main body frame includes a first frame 13 that pivotally supports the heat roller 11 and a second frame 14 that pivotally supports the press roller 12. The upstream end of the first frame 13 in the recording paper transport direction is engaged with the upstream end of the second frame 14 in the recording paper transport direction, and the downstream end of the first frame 13 in the recording paper transport direction. And a downstream end portion of the second frame 14 in the recording paper conveyance direction. Coil springs for urging the roller shaft of the press roller 12 toward the heat roller 11 are attached to both end portions in the axial direction of the roller 11 of the second frame 14, and the first frame 13 and the second frame 14 are attached. And the press roller 12 is pressed against the heat roller 11 by the coil spring.

  A nip release lever 7 for releasing the nip between the heat roller 11 and the press roller 12 is provided at both ends in the axial direction of the roller 11 in the second frame 14, and the nip release lever 7 opens the jam access cover. Sometimes it is hooked on the jam access cover frame and pivots in the nip release direction.When the jam access cover is closed, it is pushed by the jam access cover frame and pivots in the nip direction, interlocking with the opening and closing of the jam access cover. It is configured to rotate.

  A guide member 13b that guides the conveyance of the recording paper toward the downstream side in the recording paper conveyance direction on the side surface (upper surface in the present embodiment) 13a on the downstream side in the recording paper conveyance direction of the first frame 13 of the fixing device 1. ... 13 b and peeling claw attachment members 3, 3... For attaching the peeling claw 2 are projected, and the guide members 13 b. 13 b. 3 ... is arranged in a straight line over the axial length of the heat roller 11 in the axial direction of the roller 11. The guide members 13b, 13b, ... and the peeling claw attaching members 3, 3, ... are alternately arranged in the axial direction of the roller 11, and the guide members 13b, 13b are arranged on both outer sides.

That is, a plurality of peeling claw attachment members 3, 3... Are arranged at predetermined intervals in the axial direction of the roller 11, and the peeling claw 2 attached to the peeling claw attachment members 3, 3. It is configured to be arranged along the conveyance path of the recording paper.
In the present embodiment, the peeling claw attaching members 3, 3... Are arranged at three positions corresponding to the longitudinal center portion and both longitudinal sides of the heat roller 11. There are no particular restrictions on the number and position of the claw mounting members 3.

  The guide member 13b is provided with a large number of ribs 13c, 13c,... At predetermined intervals in the axial direction of the roller 11, and the ribs 13c are arranged around the guide member 13b in a direction perpendicular to the guide member 13b. Projected. Among the large number of ribs 13c, 13c, some of the ribs 13b, 13b,... Are arranged at the boundary between the guide member 13b and the peeling claw mounting member 3, that is, when viewed from the peeling claw mounting member 3. A pair of ribs 13c and 13c are arranged on both sides of the roller 11 in the axial direction. The large number of ribs 13c, 13c,... Reduces the contact area of the recording paper conveyed through the fixing device 1, reduces the frictional resistance, and smoothly conveys the recording paper. Yes.

  Further, a large number of ribs 14c, 14c,... Project from the outer surface of the second frame 14 of the fixing device 1 on the side facing the paper surface reversing path, and the large number of ribs 14c, 14c,. The roller 11 is arranged at a predetermined interval in the axial direction, the contact area of the recording paper conveyed through the paper surface inversion path is reduced by the ribs 14c, 14c, ..., the frictional resistance is reduced, and the recording paper is smooth. It is comprised so that it may be conveyed.

  Further, on the side surface 13a of the first frame 13 of the fixing unit 1 on the downstream side in the recording paper conveying direction, a predetermined interval is provided in the axial direction of the roller 11 to prevent the peeling claw 2 from falling off. .. are provided in a plurality of protrusions, and the regulating members 4, 4... Are behind the separation claw mounting members 3, 3... (On the side opposite to the roller 11 axial direction on the side opposite to the heat roller 11). Has been placed.

  As described above, the guide members 13b, 13b,..., The ribs 13c, 13c, the peeling claw attachment members 3, 3,. Restricting members 4, 4... Are provided, and these members are integrally formed with the first frame 13 by resin molding, and the number of parts is reduced by eliminating the fastening members such as screws. Cost reduction is planned. Further, the ribs 14c, 14c,... Are also formed integrally with the second frame 14 to reduce costs.

Next, the configuration of the peeling claw 2 will be described.
As shown in FIGS. 3 and 4, the peeling claw 2 for peeling the recording paper from the outer peripheral surface of the heat roller 11 can swing in the direction perpendicular to the axial direction of the roller 11. The peeling claw 2 is urged so that the claw portion 2b at the tip (one end in the longitudinal direction) is in contact with the outer peripheral surface of the heat roller 11.

  As shown in FIG. 5 and FIG. 6, the peeling claw 2 includes a body portion 2 a having a “H” shape in side view, a claw portion 2 b formed at one longitudinal end of the body portion 2 a, and the body portion. Engagement recess 2c formed on the other side in the longitudinal direction of 2a, rotation bases 2d and 2d projecting on both sides of the main body portion 2a, and projecting on the outer surface of the rotation bases 2d and 2d Rotating shafts 2e and 2e, and the diameter of the rotating base 2d is larger than the diameter of the rotating shaft 2e. The rotating base 2d and the rotating shaft 2e It has a stepped shape, and the rotation shafts 2 e and 2 e on both sides of the peeling claw 2 are configured to be rotatably supported by the peeling claw mounting member 3.

  The engaging recess 2c is arranged inside the main body portion 2a on the side where it bends into a “h” shape and is formed in an arc shape. The coil spring 5 attached to the peeling claw mounting member 3 is attached to the engaging recess 2c. It is configured to be engaged.

Next, the configuration of the peeling claw mounting member 3 will be described.
As shown in FIGS. 7 and 8, the peeling claw attachment member 3 has a “T” -shaped opening 3 a formed at the center with respect to the axial direction of the roller 11, and the opening 3 a is formed on the heat roller 11 side (peeling claw). The first space 3b (on the base side of the mounting member 3) and the second space 3c on the side opposite to the heat roller 11 are configured, and the second space 3c is wider in the axial direction of the roller 11 than the first space 3b. Is formed.

  The peeling claw attaching member 3 has a pair of shaft support portions 3d and 3d across the first space 3b, and the pair of shaft support portions 3d and 3d are arranged to face the roller 11 in the axial direction. Each shaft support portion 3d is formed with a “U” -shaped bearing portion 3e having one end opened. The pair of shaft support portions 3d and 3d serve as a support member that rotatably supports the rotation shafts 2e and 2e of the peeling claw 2, and the pair of shaft support portions 3d and 3d in the axial direction of the roller 11 The interval (interval in the axial direction of the roller 11 of the first space 3b) is substantially the width between the outer side surfaces of the rotation bases 2d and 2d of the peeling claw 2 (the axial length of the rotation shaft 2e) or the width. Are formed at slightly wider intervals.

  The bearing portions 3e and 3e are formed by recesses recessed in the axial direction of the roller 11 on the opposing surfaces of the shaft support portions 3d and 3d, and the bottom surfaces of the pair of bearing portions 3e and 3e (the roller 11 shaft). The distance between the side surfaces 3f and 3f is approximately the width between the outer surfaces of the rotation shafts 2e and 2e of the peeling claw 2 (the length in the axial direction of the rotation shaft 2e) or a distance slightly larger than the width. It is formed with. The open side of the "U" -shaped bearing portion 3e is directed to the regulating member 4 side, and the diameter of the arc portion on the back side (anti-regulating member 4 side) of the bearing portion 3e is the rotation of the peeling claw 2 The structure is smaller than the diameter of the base 2d, and is slightly larger than the diameter of the rotation shaft 2e of the peeling claw 2.

  With such a configuration, the rotating shaft 2e of the peeling claw 2 engages with the bearing portion 3c, but the rotating base 2d of the peeling claw 2 is configured not to fall into the bearing portion 3e. Is attached to the peeling claw mounting member 3, the rotation shafts 2e and 2e on both sides of the peeling claw 2 are inserted into the bearing portions 3e and 3e of the pair of shaft support portions 3d and 3d, respectively. 2e and 2e are controlled to move in the axial direction of the rotary shaft 2e (the axial direction of the roller 11) by the concave bottom surfaces 3f and 3f of the bearing portions 3e and 3e, and the both sides of the peeling claw 2 are rotated. The bases 2d and 2d are arranged in the first space 3b between the opposed surfaces of the pair of shaft support portions 3d and 3d, and the rotation base portions 2d and 2d are rotated by the opposed surfaces of the pair of shaft support portions 3d and 3d. The movement of the shaft 2e in the axial direction (the axial direction of the roller 11) is restricted. .

  With such a configuration, the rotation shafts 2e and 2e of the peeling claw 2 are detachably inserted into the bearing portions 3e and 3e of the peeling claw mounting member 3 from the opening side in a direction perpendicular to the rotation shaft 2e, It is comprised so that it may be received by the inner peripheral part of bearing part 3e * 3e.

  Further, the peeling claw mounting member 3 has a pair of spring mounting portions 3h and 3h across the second space 3c, and the pair of spring mounting portions 3h and 3h are arranged so as to oppose each other in the axial direction of the roller 11. Has been. The spring mounting portions 3h and 3h are formed in a bowl shape, and are configured such that both ends in the longitudinal direction of the coil spring 5 are detachably hooked to the pair of spring mounting portions 3h and 3h. The pair of spring support portions 3h and 3h serve as support members for supporting both ends in the longitudinal direction of the coil spring 5, and the axial direction of the roller 11 in the second space 3c between the pair of spring mounting portions 3h and 3h. The interval is formed wider than the width between both outer surfaces of the rotating shafts 2e and 2e of the peeling claw 2 (the length in the axial direction of the rotating shaft 2e), and the separation claw 2 is separated from the second space 3c. The other side in the longitudinal direction is configured to be easily inserted into the regulating member 4 side.

  In this embodiment, the coil spring 5 is used as the urging means, and the coil spring 5 is spanned between the pair of spring mounting portions 3h and 3h, and spanned between the pair of spring mounting portions 3h and 3h. The engaging recess 2c of the peeling claw 2 is hooked on the longitudinal center of the coil spring 5 and the other side in the longitudinal direction of the peeling claw 2 is inserted into the regulating member 4 side, and the rotation shafts 2e and 2e of the peeling claw 2 are inserted. When the coil spring 5 is inserted into the bearing portions 3e and 3e of the peeling claw mounting member 3, the coil spring 5 is pulled to the heat roller 11 side, and the coil spring 5 pulls the peeling claw 2 by its restoring force from the pulled state. The claw portion 2b is configured to be urged to rotate in the direction in which the outer peripheral surface of the heat roller 11 is pressed. However, the type of urging means is not limited to the coil spring 5, and a rubber string is used instead of the coil spring 5. Etc. It may be.

  With the configuration as described above, the peeling claw attaching member 3 is a bearing member to which the rotary shafts 2e and 2e on both sides of the peeling claw 2 are detachably attached in a direction perpendicular to the rotary shaft, and the coil spring 5 Is a spring mounting member that is detachably mounted. The longitudinal direction of the peeling claw 2 and the longitudinal direction of the coil spring 5 that are attached to the peeling claw mounting member 3 are configured to be orthogonal to each other.

Next, the configuration of the restricting member 4 will be described.
As shown in FIGS. 7 and 8, the regulating member 4 is disposed in the direction in which the rotation shafts 2 e and 2 e of the peeling claw 2 are removed from the peeling claw mounting member 3, that is, on the open side of the bearing portions 3 e and 3 e. The distance between the regulating member 4 and the peeling claw mounting member 3 is wider than the diameter of the rotation shafts 2e and 2e of the peeling claw 2. In the present embodiment, the restricting member 4 is opposed to the axial direction of the rotation shaft 2e with a gap slightly wider than the thickness of the other side in the longitudinal direction on the opposite side of the peeling claw body 2a. It is comprised by a pair of regulation rib 4b * 4b, and it is comprised so that the longitudinal direction other end part of the main body 2a of the peeling nail | claw 2 inserted by the peeling claw attachment member 3 may be inserted in this gap | interval.
The restricting member 4 is not limited to the pair of restricting ribs 4b and 4b, and is slightly larger than the thickness of the other side in the longitudinal direction on the opposite side of the peeling claw body 2a in the axial direction of the rotation shaft 2e of the peeling claw. A block-shaped member having a wide gap may be used, and the configuration of the regulating member 4 is not particularly limited.

  The side ends of the pair of regulating ribs 4b and 4b on the anti-peeling claw mounting member 3 side are coupled by a coupling member 4a, and the gap between the regulating ribs 4b and 4b is kept constant by the coupling member 4a. It is configured as follows. The connecting member 4a is also formed integrally with the first frame 13 together with the regulating ribs 4b and 4b.

  With such a configuration, when the peeling claw 2 is inserted into the peeling claw mounting member 3, the other end in the longitudinal direction of the peeling claw body 2a is sandwiched between the pair of regulating ribs 4b and 4b. 2e, and the other end in the longitudinal direction of the peeling claw main body 2a is rotated by the inner side surfaces of the pair of regulating ribs 4b and 4b. The moving shaft 2e is disposed in a state where movement in the axial direction is restricted. The pair of regulating ribs 4b and 4b prevent the peeling claw 2 from being displaced or inclined in the axial direction, and the rotation shafts 2e and 2e of the peeling claw 2 are removed from the bearing portions 3e and 3e of the peeling claw mounting member 3. The reliability is improved by not taking off.

  Further, the pair of regulating ribs 4b and 4b are engaged with the engaging recess 2c of the peeling claw 2 when the peeling claw 2 inserted into the peeling claw mounting member 3 is moved to the opening side of the bearing portions 3e and 3e, respectively. The first position where the coil spring 5 hooked on the first contact position and the peeling claw 2 inserted into the peeling claw mounting member 3 are rotated in the direction in which the claw portion 2b separates from the outer peripheral surface of the heat roller 11, thereby A second position where the coil spring 5 hooked in the engaging recess 2c of the peeling claw 2 is engaged when moved to the open side of the portions 3e and 3e.

  The first position is a restriction portion 4d facing the bearing portion 3e of the peeling claw attachment member 3 of each restriction rib 4b, and the second position is formed on the separation claw attachment member 3 side of each restriction rib 4b. An engaging portion 4e for engaging the coil spring 5 is constituted. The second position 4d is disposed closer to the base side (the heat roller 11 side) of the restriction rib 4b than the first position 4c, and the first position is formed at the center in the protruding direction of each restriction rib 4b. The second position is formed near the base of each regulating rib 4b. The depth direction of the groove of the engaging portion 4e in the second position and the depth direction of the groove of the bearing portion 3e of the peeling claw attaching member 3 are opposite to each other, and the engaging portion 4e and the bearing portion 3e are different in level. They are arranged in parallel.

The engaging portion 4e is disposed at the base of the regulating rib 4b. Unlike the bearing portion 3e of the peeling claw mounting member 3, the engaging portion 4e of the regulating rib 4 has no wall surface in the axial direction of the roller 11, and the engaging portion 4e. Is recessed in an arc shape toward the open side of the bearing portion 3e.
The corner portion is chamfered from the restriction portion 4d at the first position to the engaging portion 4e at the second position, but the corner portion is chamfered and is hooked on the engagement recess 2c of the peeling claw 2 by the chamfered portion 4c. Further, the coil spring 5 is configured to easily enter the engaging portion 4e.

  The arrangement position of the engaging portion 4e of the regulating rib 4b and the bearing portion 3e of the peeling claw attaching member 3 will be described in detail. The distance of the first frame 13 to the side surface 13a on the downstream side in the recording paper conveyance direction is the direction of the engaging portion 4e. Is disposed at a position closer to the bearing portion 3e. The reason why the engaging portion 4e of the regulating rib 4b and the bearing portion 3e of the peeling claw mounting member 3 are arranged in this positional relationship is that the engaging portion 4e is located farther than the bearing portion 3e, contrary to this arrangement position. In order to place the coil spring 5 hooked on the engaging recess 2c of the peeling claw 2 into the engaging portion 4e, the peeling claw 2 is rotated in a direction in which the claw portion 2b presses the outer peripheral surface of the heat roller 11. Although the peeling claw 2 is in contact with the outer peripheral surface of the heat roller 11 in the assembled state, the engagement of the peeling claw 2 with the engaging portion 4e is not performed unless the heat roller 11 is assembled. The coil spring 5 hooked on the mating recess 2c cannot be engaged, and workability is not good.

  Further, when the engaging portion 4e and the bearing portion 3e are arranged at the same distance, that is, when the engaging portion 4e and the bearing portion 3e are arranged to face each other, the engaging recess 2c of the peeling claw 2 is placed on the engaging portion 4e. In order to engage the coil spring 5 hooked on the heat spring 11, it is not necessary to detach the heat roller 11 as in the case described above, and the peeling claw 2 may be moved to the opening side of the bearing portion 3e as it is. However, at this arrangement position, a force is applied to the peeling claw 2 in the direction of moving toward the opening side of the bearing portion 3e with some time when the fixing device 1 is in operation, and the rotation shaft 2e of the peeling claw 2 from the bearing portions 3e and 3e. When the coil spring 5 hooked on the engaging recess 2c of the peeling claw 2 is engaged with the engaging portion 4e, the rotating shafts 2e and 2e of the peeling claw 2 are attached to the regulating member 4 and the peeling claw in this state. Since it is located in the gap between the member 3, the peeling claw 2 may easily come off as it is.

  For the reasons described above, the distance of the first frame 13 to the side surface 13a on the downstream side in the recording paper conveyance direction is arranged such that the engaging portion 4e of the regulating rib 4b is closer to the bearing portion 3e of the peeling claw mounting member 3. ing. Further, when this arrangement position is described from the viewpoint of the rotation direction of the peeling claw 2, the engaging portion 4 e at the second position of the regulating rib 4 b is formed on the regulating rib 4 b facing the bearing portion 3 e of the peeling claw mounting member 3. When the peeling claw 2 is rotated in the direction in which the claw portion 2b is separated from the heat roller 11 with respect to the first position, the other end in the longitudinal direction of the peeling claw 2 is arranged on the side in the direction of rotation. Yes.

Next, the attachment structure of the peeling claw 2 will be described.
As shown in FIGS. 8 and 9, when attaching the peeling claw 2, first, the user attaches the coil spring 5, which is an urging means, to the pair of spring mounting portions 3 h. After spanning between 3 h, the peeling claw 2 is picked with a finger, and is positioned so that the engaging recess 2c of the peeling claw 2 is disposed on the heat roller 11 side, and the engaging recess 2c of the peeling claw 2 is placed. Is hooked on the central portion in the longitudinal direction of the coil spring 5 spanned between the spring mounting portions 3h and 3h (see FIG. 9A).

  In this state, the coil spring 5 hooked by the engaging recess 2c of the peeling claw 2 while rotating the peeling claw 2 in a direction in which the claw portion 2b separates from the outer peripheral surface of the heat roller 11 is moved to the first of the regulating ribs 4b and 4b. Through the position 1, it is engaged with the engaging portions 4e and 4e in the second position (see FIGS. 9B, 9C, and 9D). At this time, the rotation shafts 2 e and 2 e of the peeling claw 2 pass between the end of the peeling claw mounting member 3 on the side of the regulating rib 4 b and the end of the regulating rib 4 b and 4 b on the side of the peeling claw mounting member 3, When the coil spring 5 hooked by the mating recess 2c is engaged with the engaging portions 4e and 4e of the restricting ribs 4b and 4b, the rotation shafts 2e and 2e of the peeling claw 2 restrict the first position of the restricting ribs 4b and 4b. It is located in the gap between the portions 4d and 4d and the peeling claw mounting member 3, and faces the open side of the bearing portions 3e and 3e of the peeling claw mounting member 3 (see FIG. 9D).

  Then, from this state, the rotating shafts 2e and 2e of the peeling claw 2 are moved toward the back side of the bearing portions 3e and 3e of the peeling claw mounting member 3, and the rotating shafts 2e and 2e of the peeling claw 2 are moved. Is received by the inner periphery of the bearing portions 3e and 3e (see FIG. 9 (e)), and then the peeling claw 2 is moved to its claw portion by the restoring force of the coil spring 5 while loosening the force of the finger supporting the peeling claw 2 2b is rotated in a direction approaching the outer peripheral surface of the heat roller 11, and when the claw portion 2b is in contact with the outer peripheral surface of the heat roller 11 (see FIG. 9F), the finger holding the peeling claw 2 is removed. Release and complete the attachment of the peeling claw 2.

  In this way, the peeling claw 2 can be easily attached manually, and in this attached state, the coil spring 5 is pulled toward the heat roller 11 by the engagement recess 2c of the peeling claw 2, and is pulled. Due to the restoring force from the state, the peeling claw 2 is urged to rotate in a direction in which the claw portion 2 b presses the outer peripheral surface of the heat roller 11. Even if a force is applied to the peeling claw 2 in the attached state toward the regulation rib 4b, the coil spring 5 hooked by the engaging recess 2c is the first of the regulation ribs 4b and 4b. No longer move toward the regulating rib 4b when it abuts against the regulating portion 4d, 4d at the position, and the falling off from the bearing portions 3e, 3e to the regulating rib 4b is prevented.

  Further, the peeling claw 2 attached to the peeling claw attachment member 3 is inserted into the gap between the regulating ribs 4b and 4b at the other end in the longitudinal direction on the opposite side of the main body 2a. Is prevented from shifting or tilting in the direction of the rotation axis 2e.

  When removing the peeling claw 2, first, the peeling claw 2 is picked with a finger, the peeling claw 2 is moved toward the opening side of the bearing portions 3 e and 3 e, and the engagement claw 2 c of the peeling claw 2 is moved. After the hooked coil spring 5 is moved to the restriction portions 4d and 4d, which are the first positions of the restriction ribs 4b and 4b, the peeling claw 2 is rotated in a direction in which the claw portion 2b is separated from the outer peripheral surface of the heat roller 11. (See FIGS. 9 (f) and 9 (e)), the coil spring 5 that is further moved to the opening side of the bearing portions 3 e and 3 e and engaged with the engaging recess 2 c of the peeling claw 2 is moved to the first of the regulating ribs 4 b and 4 b. It engages with the engaging portions 4e and 4e at the position 2 (see FIG. 9D).

  In this state, the pivoting shafts 2e and 2e of the peeling claw 2 are positioned in the gap between the regulating portions 4d and 4d, which are the first positions of the regulating ribs 4b and 4b, and the peeling claw mounting member 3, and the peeling claw mounting member 3 is opposed to the open side of the bearing portions 3e and 3e, and in this state, the peeling claw 2 is moved away from the heat roller 11 while rotating the claw portion 2b further away from the outer peripheral surface of the heat roller 11. The separation claw 2 is passed through between the end portion of the separation claw mounting member 3 on the side of the regulation rib 4b and the end portion of the regulation rib 4b, 4b on the side of the separation claw attachment member 3. Retraction is performed (see FIGS. 9C, 9B, and 9A), the engagement recess 2c of the peeling claw 2 and the coil spring 5 are disengaged, and the removal of the peeling claw 2 is completed. In this way, the removal claw 2 can be easily removed manually.

  With the configuration as described above, the peeling claw 2 can be easily attached to and detached from the peeling claw attachment member 3 by hand without using a tool, thereby improving maintainability.

FIG. 3 is a perspective view of the fixing device 1. FIG. 3 is a perspective view of the fixing device 1. The front view of the peeling nail 2 attached to the peeling nail attachment member 3. FIG. AA arrow sectional drawing in FIG. The side view of the peeling nail | claw 2. The bottom view of the peeling nail | claw 2. FIG. The front view of the peeling nail attachment member 3 and the control member 4. BB sectional drawing in FIG. The figure explaining a mode that the peeling nail | claw 2 is attached to the peeling claw attachment member 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing device 2 Peeling claw 2b Claw part 2a Peeling claw body 2c Engaging concave part 2d Rotating base part 2e Rotating shaft 3 Peeling claw attaching member 3a Opening part 3b First space 3c Second space 3d Shaft support part 3e Bearing part 3f Concave part Bottom surface 3h Spring mounting portion 4 Restriction member 4b Restriction rib 4d Restriction site 4e Engagement portion 5 Coil spring 11 Heat roller 12 Press roller 13 First frame 14 Second frame

Claims (3)

A peeling claw for peeling the recording paper from the outer peripheral surface of the heat roller;
A bearing member that is removably attached in a direction orthogonal to the rotation axis of the rotation shafts on both sides of the peeling claw;
A fixing device comprising:
In the direction of removing the rotation axis of the peeling claw with respect to the bearing member, the bearing member is arranged at a position spaced apart from the diameter of the rotation axis of the peeling claw in the direction of the rotation axis of the peeling claw. A regulating member is provided that has a gap that is slightly wider than the thickness of the anti-nail side end of the peeling nail body, and into which the anti-nail side end of the peeling nail body attached to the bearing member is inserted. A fixing device characterized by having been made.   The fixing device according to claim 1, wherein the regulating member is a pair of ribs arranged to face each other with the gap therebetween.   The fixing device according to claim 1, wherein the regulating member is formed integrally with a fixing device main body frame.

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