JPH06266258A - Separation claw release mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The detaching claw unit is detachably attached to the main body of the device by magnetic coupling so that the detaching claw unit can be easily removed. [Structure] A separation claw unit 1 having a plurality of separation claws 8 elastically abutting on the outer peripheral surface of a fixing roller 7 is provided, and a magnetic coupling portion for detachably attaching the separation claw unit 1 to an apparatus main body. 9 and 10 are provided at the facing portion between the separating claw unit 1 and the apparatus main body. Furthermore, the magnetic coupling part 9,
An operation unit 11 for applying an operating force for moving the separation claw unit 1 in a direction in which the magnetic coupling state between the magnetic coupling units 9 and 10 is released at a position separated from each other in a direction orthogonal to the coupling direction of 10.
To provide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation claw release mechanism for canceling the set state of separation claws set with the tip of the claws elastically abutting the outer peripheral surface of a fixing roller. .

[0002]

2. Description of the Related Art Conventionally, in a fixing device such as a copying machine or a printer, a separating claw is used for separating a sheet of which fixing processing has been completed from a fixing roller. It is set in a state of elastically abutting the outer peripheral surface. On the other hand, it is necessary to cancel the set state of the separation claws when the fixing device is jammed or when the fixing device is maintained.

There are various separating claw releasing mechanisms for canceling the set state of the separating claws. For example, as disclosed in Japanese Utility Model Laid-Open No. 1-92666 and Japanese Patent Laid-Open No. 2-158785, Generally, a unit provided with a separation claw is rotatably provided.

Further, the separation claw unit with the separation claw attached is detachably attached to the main body of the apparatus such as a copying machine by using a magnet, and the separation claw unit is used at the time of jam processing in the fixing device or maintenance of the fixing device. It may be removed. Then, when the separation claw unit is removed, a sufficient space is secured around the fixing device, and jam clearance and maintenance can be easily performed.

[0005]

However, when the separation claw unit is detachably attached using a magnet, it is necessary to increase the magnetic force of the magnet so that the separation claw unit does not shift due to the influence of vibration or the like. is there. Also, as the magnetic force of the magnet is increased, a large force is required to remove the separation claw unit, and since the force at the time of magnet separation is large, the worker's hands and body should not be affected by a shock at the time of magnet separation. There is a risk of being injured by hitting a member around the separation claw unit.

[0006]

The invention according to claim 1 is
A separation claw unit having a plurality of separation claws that are rotatably supported around a support shaft and that elastically abut the tip of the claw with the outer peripheral surface of the fixing roller is provided, and the separation claw unit is provided in the apparatus main body A magnetic coupling portion for detachably attaching to the magnetic coupling portion is provided at an opposing portion of the separating claw unit and the apparatus main body, and the magnetic coupling portions are magnetically coupled to each other at a position separated in a direction orthogonal to the coupling direction of the magnetic coupling portion. An operation unit is provided that applies an operating force to move the separation claw unit in the direction to release the state.

According to a second aspect of the present invention, in the first aspect of the present invention, the first support body is provided with an abutting portion for abutting against the fixing member of the apparatus main body, the separation claw, the magnetic coupling portion, and the abutting portion. A second supporting body having an operating portion that presses the first supporting body in a direction in which the first supporting body is brought into contact with the fixing member, and the first supporting body and the second supporting body are shaken in a superposed state. The separation claw unit was formed by movably connecting.

According to a third aspect of the present invention, in the invention according to the second aspect, the rotation fulcrum portion, the long operation piece to which the rotation operation force is applied, and the abutting portion are first contacted with the fixing member. An operating part having a short working piece for pressing the support is provided.

[0009]

According to the first aspect of the invention, the separation claw unit is moved by operating the operation portion, and the magnetic coupling state between the magnetic coupling section of the separation claw unit and the magnetic coupling section of the apparatus main body is released. Moreover, since the operating portion is provided at a position separated in the direction orthogonal to the coupling direction of the magnetic coupling portion,
Even if the force applied to the operation part is small, a large decoupling force acts on the magnetic coupling part between the magnetic coupling parts, and it is easy to release the magnetic coupling state between the magnetic coupling parts and detach the separation claw unit from the device body. I can do it.

According to the second aspect of the present invention, when the first supporting member is pressed by the operation of the operating portion to bring the abutting portion into contact with the fixing member, the abutting portion abuts against the fixing member. Cannot move in the pressing direction, and as a reaction thereof, the second support moves in the direction opposite to the pressing direction and the magnetic coupling state between the magnetic coupling portions is released.

According to the third aspect of the present invention, since the operation piece in the operation portion is formed long and the action piece is formed short, even if the rotational operation force applied to the operation piece is small, the operation piece makes the first support. The pressing force acting on the body is increased, and the movement of the second support body in the direction opposite to the pressing direction and the release of the magnetic coupling state between the magnetic coupling portions are easily performed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a side view showing the separation claw unit 1 in a state of being attached to an apparatus main body (not shown) of a copying machine, and FIG. 2 is a plan view thereof. Here, the separation claw unit 1
Is formed by swingably connecting the slider 2 which is the first support body and the stay 3 which is the second support body. The swingable connection between the slider 2 and the stay 3 is the slider 2 This is done by inserting screws 5 into the long holes 4 formed in the and the long holes (not shown) formed in the stay 3.

A plurality of stays 3 are rotatably supported around the support shaft 6 and elastically contact the tip end of the claw with the outer peripheral surface of the fixing roller 7 by the urging force of a spring described later. Of the separation claw 8 and the separation claw unit 1 which is a magnetic coupling part for detachably attaching the separation claw unit 1 to a frame 9 which is a fixing member of the apparatus main body and a magnetic coupling part. A handle 11, which is an operation unit for releasing the coupled state, is provided. The separation claw 8 is formed by a claw body 8a made of polyimide resin (PI) as a base material and a holder 8b made of polyphenylene sulfide resin (PPS), and is provided in a groove (not shown) of the holder 8b. The claw body 8a and the holder 8b are fixed by elastically fitting the formed protrusion (not shown) into a hole (not shown) formed in the claw body 8a.

As shown in FIG. 2, the stay 3 is formed in an elongated shape along the direction of the center of rotation of the fixing roller 7, and the magnet 10 is located on one side of the center of the stay 3 in the longitudinal direction. The handle 11 is attached to a position closer to one side on the opposite side of the center of the stay 3 in the longitudinal direction. Further, the handle 11 has a rotation fulcrum portion 11a, an operation piece 11b for applying a rotation operation force when the handle 11 is rotated, and an action piece for pressing the slider 2 in accordance with the rotation operation. 11c and
Lever ratio of the handle 11 (from the rotation fulcrum portion 11a to the operation piece 1
The ratio of the dimension up to the force point in 1b and the dimension from the rotation fulcrum portion 11a to the action point in the action piece 11c) is about 3
Is set to.

On the other hand, the slider 2 has a pair of abutting portions 12 and 13 which sandwich the magnet 10 and a plurality of locking projections 14 provided corresponding to the separating claws 8.
And a pressure receiving projection 15 with which the action piece 11c of the handle 11 abuts when the handle 11 is rotated. A spring 16 is stretched between the locking protrusion 14 and a locking portion 8c integrally formed with the holder 8b of the separation claw 8 located corresponding to the locking protrusion 14. The tip of the claw of the separation claw 8 is elastically contacted with the outer peripheral surface of the fixing roller 7 by the urging force of 16. Further, the contact portions 12 and 13 are in contact with the frame 9.

In such a structure, the separating claw unit 1 is attached to the main body of the apparatus as shown in FIG. 1 by magnetically coupling the magnet 10 to the frame 9, while the fixing apparatus including the fixing roller 7 is provided. In the case of carrying out the jam treatment in step 1, maintenance of the fixing device, etc., the separation claw unit 1 is removed from the main body of the device.

When the separating claw unit 1 is detached from the main body of the apparatus, the handle 11 is rotated as shown in FIG.
Rotate around a in the direction of arrow A. Then, handle 1
The action piece 11c of No. 1 contacts the pressure receiving projection 15 of the slider 2 and presses the slider 2 toward the fixing roller 7. But,
Since the contact portions 12 and 13 are in contact with the frame 9, the slider 2 does not move to the fixing roller 7 side, and as a reaction thereof, the stay 3 moves in a direction away from the fixing roller 7 (direction of arrow B). To do. Then, as the stay 3 moves in the direction of arrow B, the tip of the slider 2 abuts on the locking portion 8c of the separation claw 8, and the separation claw 8 resists the biasing force of the spring 16 and fixes the claw tip to the fixing roller. It rotates around the support shaft 6 in a direction away from the outer peripheral surface of 7. Further, by moving the stay 3 in the direction of the arrow B, the magnetic coupling state between the magnet 10 attached to the stay 3 and the frame 9 is released, and the separation claw unit 1 can be detached from the apparatus main body.

Here, the movement of the stay 3 in the direction of the arrow B when the magnet 11 and the frame 9 are released from the magnetically coupled state by rotating the handle 11 is actually as shown in FIG. This is rotation about the magnetic coupling side of the magnet 10 with respect to the frame 9, and the point farthest from the handle 11 of the magnet 10 is the fulcrum, and the central portion of the magnetic coupling range of the magnet 10 is the action point.
It can be considered as a "lever" having a center point of the action piece 11c of FIG. When the dimension from the fulcrum to the point of action is “a” and the dimension from the fulcrum to the force point is “b”,
Since the leverage ratio of a: b is large, even if the force applied to the handle 11 is small, a large decoupling force acts on the magnet 10, and the magnetic coupling state between the magnet 10 and the frame 9 is easily released with a small force. be able to.

Further, the slider 11 is operated by rotating the handle 11.
Even when pressing, since the lever ratio of the handle 11 is set to about 3, even if the force applied to the operation piece 11b of the handle 11 is small, a large pressing force acts on the pressure receiving projection 15 of the slider 2, The magnetic coupling between the magnet and the frame 9 can be released more easily.

In this embodiment, the magnet 10 which is the magnetic coupling portion is attached to the stay 3, and the frame 9 which is the magnetic coupling portion is attached to the main body of the apparatus. Alternatively, a metal piece of magnetic material may be provided as a magnetic coupling portion and the magnet 10 may be attached to the apparatus body.

In this embodiment, the separation claw unit 1 is described as an example in which the separation claw unit 1 is formed of two members, the slider 2 and the stay 3, but the separation claw unit may be formed of one member. In that case, the action piece 11 of the handle 11 when the handle 11 attached to the separation claw unit is rotated.
c is brought into contact with the fixing member of the apparatus main body.

[0022]

As described above, the invention according to claim 1 supports a plurality of rotatably supported shafts and elastically abuts the tips of the claws on the outer peripheral surface of the fixing roller. A separation claw unit having a separation claw is provided, and a magnetic coupling portion for detachably attaching the separation claw unit to the apparatus main body is provided at a facing portion between the separation claw unit and the apparatus main body, and a coupling direction of the magnetic coupling portion. Since an operation section for applying an operating force for moving the separation claw unit in the direction of releasing the magnetically coupled state between the magnetic coupling sections is provided at a position separated from each other in a direction orthogonal to the direction, the separation is performed by operating the operation section. The claw unit can be moved to release the magnetic coupling between the magnetic coupling section of the separating claw unit and the magnetic coupling section of the main body of the device, and the operating section is separated in the direction orthogonal to the coupling direction of the magnetic coupling section. did Since it is installed on the operation unit, a large decoupling force can be applied to the magnetic coupling portions between the magnetic coupling portions even if the force applied to the operating portion is small, and therefore the magnetic coupling state between the magnetic coupling portions is released. Also, the separation claw unit can be easily removed from the apparatus main body.

As described above, the invention according to claim 2 is the same as the invention according to claim 1, in which the first supporting member is provided with an abutting portion for abutting against the fixing member of the apparatus main body, the separating claw and the magnetic coupling portion. In the direction in which the abutting portion abuts the fixing member, the first
A second supporting body having an operating portion for pressing the supporting body is provided, and the first supporting body and the second supporting body are pivotally connected to each other in a stacked state to form a separation claw unit. Therefore, when the first support body is pressed by the operation of the operation portion to bring the contact portion into contact with the fixing member, the first support body in which the contact portion contacts the fixing member cannot move in the pressing direction, As a reaction, the second support moves in the direction opposite to the pressing direction, and the magnetic coupling state between the magnetic coupling portions is released,
Therefore, the magnetic coupling state between the magnetic coupling portions can be released while maintaining the position fixing of the first support body in the separation claw unit. Therefore, the state in which the first support body is held by the holding portion or the like is achieved. By setting them, it is possible to stably remove the separation claw unit from the apparatus body after releasing the magnetically coupled state between the magnetically coupled portions.

According to the third aspect of the invention, as described above, in the second aspect of the invention, the rotation fulcrum portion, the long operation piece to which the rotation operation force is applied, and the contact portion are brought into contact with the fixing member. Since the operating portion having the short action piece that presses the first support in the direction is provided, the pressing force that acts on the first support from the action piece increases even if the rotational operation force applied to the operation piece is small.
This has the effect that the movement of the second support in the direction opposite to the pressing direction and the release of the magnetically coupled state between the magnetically coupled portions can be performed more easily.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a separation claw unit according to an embodiment of the present invention is attached to an apparatus main body.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view showing a state in which the separation claw unit is removed from the apparatus main body.

FIG. 4 is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation claw unit 2 1st support body 3 2nd support body 6 Support shaft 7 Fixing roller 8 Separation claw 9 Magnetic coupling part, fixing member 10 Magnetic coupling part 11 Operation part 11a Rotation fulcrum part 11b Operation piece 11c Operation piece 12, 13 Contact part

Claims (3)

[Claims] 1. A separation claw unit having a plurality of separation claws rotatably supported around a support shaft and elastically abutting a tip end of the claw on an outer peripheral surface of a fixing roller. A magnetic coupling portion for detachably attaching the claw unit to the apparatus main body is provided at an opposing portion between the separation claw unit and the apparatus main body, and the magnetic coupling is provided at a position separated in a direction orthogonal to the coupling direction of the magnetic coupling section. A separating claw releasing mechanism, characterized in that an operating section is provided for applying an operating force for moving the separating claw unit in a direction of releasing the magnetically coupled state between the sections. 2. A first support body provided with an abutting portion that abuts a fixing member of the apparatus main body, and the first supporting member in a direction of abutting the separating claw, the magnetic coupling portion and the abutting portion on the fixing member. A separation support unit is formed by providing a second support having an operation unit for pressing the body, and swingably connecting the first support and the second support in an overlapping state. The separating claw releasing mechanism according to claim 1. 3. An operating portion having a rotation fulcrum portion, a long operating piece to which a rotating operation force is applied, and a short operating piece that presses the first support in a direction in which the contact portion contacts the fixing member. The separating claw releasing mechanism according to claim 2, wherein the separating claw releasing mechanism is provided.