JPH0443268B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is used in electrophotographic copying machines and the like to fix paper from a roll-type fixing device that uses heat or pressure to fix a toner image transferred onto copy paper. This invention relates to a peeling device.

(Prior Art) In a roll-type fixing device, paper passing through the nip portion of both rollers has a tendency to wrap around the fixing roll due to the adhesiveness generated when toner is melted. Conventionally, it has been common to use a peeling claw whose tip is placed close to the fixing roll. In addition, if the paper passes through the peeling claw and wraps around the fixing roll, or if the paper is blocked by the tip of the claw and jammed in a bellows shape, the paper can be separated from the fixing roll along with its support member. Many devices are used which are configured to remove the jam paper.

(Object of the Invention) However, in general, there is not enough space around the fuser accommodating part of a copying machine to sufficiently separate the peeling claw from the fixing roll. There were many accidents in which the operator's hand touched the tip of the nail, resulting in injury to the operator's hand. The present invention has been made for the purpose of preventing injuries to operators when removing jam paper as described above.

(Structure of the Invention) In order to achieve the above-mentioned object, in the present invention, a paper peeling claw support member supporting a paper peeling claw around a rotating support shaft is positioned at a position where the tip of the peeling claw contacts the fixing roll. , and is configured to be able to rotate between two separate positions. When the peeling claw support member is separated from the fixing roll when removing the jam paper, the peeling claw is slid on an elastic cam follower and rotated by a predetermined angle, so that the tip of the claw is The present invention provides a fuser paper peeling device characterized in that it is provided with a mechanism for automatically positioning the device in a state where it is stopped at a position where it cannot be touched by an operator's hands.

(Example) Hereinafter, the configuration of the apparatus of the present invention will be explained in detail based on the example shown in the drawings.

FIG. 1 is a side view showing a schematic configuration of the most common roll fixing device for copying machines. In the illustrated example, the fixing roll 1 is a roll with a built-in heater in a fixing device that performs thermal fixing, and the pressure roll 2, which is in pressure contact with the roll 1, is used to hold the paper carrying the toner image on the right side of the diagram. The fixing roller 1 is inserted into the nip portions of both rolls to press the paper toward the fixing roll 1.

The paper that has entered the fuser has a tendency to wrap around the fuser roll 1 due to the heat and pressure applied thereto, so in order to prevent this, the leading end of the paper is brought close to the circumferential surface of the fuser roll 1. The peeling claw 3 is arranged so as to Note that bringing the tip of the peeling claw 3 into contact with the surface of the fixing roll 1 will damage the surface of the roll and cause a decline in image quality.
Needless to say, it is necessary to be extremely careful.

Now, in order to bring the tip of the peeling claw 3 close to the circumferential surface of the fixing roll with a small gap, the peeling claw 3 is rotatably locked to its support member 4 by a rotation support shaft 5. At the same time, the support member 4
A stopper (not shown) protrudes from the
It is configured to prevent rotation beyond a certain level.

Furthermore, in the event that a paper jam should occur, the support member 4 is configured to be rotatable by a hinge 7 together with a portion of the paper guide buttful 6 in order to facilitate its removal. be.

In the paper peeling device structured as described above, when the paper peeling claw support member 4 is rotated to the position shown in FIG. 2 in order to remove a paper jam, the tip of the peeling claw 3 is , the jam paper 8 is oriented in the direction of removal, and the operator's hands often get injured when trying to remove it.
As mentioned above.

In order to solve this problem, in the present invention,
As shown in FIG. 3, a cam 10 is formed on the opposite side of the peeling claw 3 from the tip of the claw, with the rotation support shaft 5 as a boundary. Further, the paper peeling claw support member 4
A cam follower 11 having spring elasticity is provided at a position where it comes into contact with the peeling pawl when the cam follower 11 is rotated clockwise via the hinge 7 to be set in a state where the jam removal work can be performed.

The cam follower 11 is disposed in the upper part of the fixing device, and is formed by processing the spring plate member by curving it so that the distal end on the side where the cam portion of the peeling claw 3 comes into contact is curved into an arc shape. using things.
The peeling claw, which is locked to the cam follower, is configured as a member that can be locked and held by its elasticity.

Then, when the paper peeling claw support member 4 is rotated clockwise together with the guide buttful 6 via the hinge 7, the cam 10 of the peeling claw is rotated.
It is made to slide along the curved surface of the tip of the cam follower 11. Therefore, the peeling claw 3
When processing jam paper, as shown in FIG. 4, the cam follower 11 is locked to the upper part of the cam follower 11 and held fixed.

In the state shown in FIG. 4, the tip of the peeling claw 3 is fixed pointing in a direction far away from the nip position between the fixing roll and the pressure roll. Even if vibrations are applied to the jammed paper in the fixing device, the peeling claw does not rotate to a position that interferes with the work, and the operator is safe when removing the jammed paper. can be protected.

(Effects of the Invention) Since the present invention is configured and operates as described above, operator safety can be ensured by adding only a few parts to the conventional fuser paper peeling device. It becomes possible. By using the peeling claw holding means, the operator can concentrate on the jam removal work, which requires an extremely unnatural posture, and the down time of the copying machine can be reduced. It has a remarkable effect on the above. In particular, when the cam mechanism releases the peeling claw supporting member to the maximum release position, only the peeling claw is rotated by a large amount, so that the mechanism is small and simple.

[Brief explanation of drawings]

1 and 2 are schematic side views illustrating the normal state and jam removal state of a conventional general fuser paper peeling device, respectively, and FIGS. 3 and 4 are diagrams according to the present invention, respectively. FIG. 2 is a schematic side view of the configuration of an embodiment of the paper peeling device, illustrating the normal state and the jam removal state. 1... Fixing roll, 2... Paper peeling claw, 4...
Paper peeling claw support member, 5...Paper peeling claw rotation support shaft, 10...Cam, 11...Cam follower.

Claims (1)

[Scope of Claims] 1. In a paper peeling device attached to a roll-type fixing device, a paper peeling claw support member rotatably supports a paper peeling claw on a rotation support shaft, and the tip of the peeling claw is attached to the circumferential surface of the fixing roll. The peeling claw support member is rotated to separate the tip of the peeling claw supported by the support member from the fixing roll to a maximum release position. In this case, a mechanism is configured to rotate the peeling claw around its rotation support shaft in the rotational direction of the peeling claw support member by a required angle at a maximum release position, and the tip of the peeling claw is used to remove the jam paper. A paper peeling device for a fuser, characterized in that it is provided with a cam mechanism for moving the paper to a position away from the direction.