JPH05333734A - Form peeling device - Google Patents

Abstract

PURPOSE:To provide a form peeling device capable of simply, easily, and quickly exchange a peeling pawl, and moreover, always and stably obtaining excellent peeling performance. CONSTITUTION:In this form peeling device provided with the peeling pawl 1 abutted on the surface of a roll 2, and peeling a form 4 carried from the roll 2, the peeling pawl 1 is composed of a supporting main body 5, a pawl member 6 attachably/detachably fitted to the supporting main body 5, and the pawl member 6 is in a shape so as to have, at least, a tapered part coming into contact with the surface of the roll, in a dot state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper peeling device, and more particularly to a paper peeling device used in a fixing device of a copying machine or the like that conveys paper by passing it between rolls.

[0002]

2. Description of the Related Art In a fixing device of a copying machine, when the unfixed toner image on a copy sheet is fixed by passing between a pair of fixing rolls, the copy sheet is prevented from being wrapped around the fixing roll. Therefore, a paper peeling device that presses a plurality of peeling claws onto the surface of the fixing roll is installed. In such a paper peeling device, generally, a contact portion of a peeling claw rotatably supported by a support shaft is pressed against a roll surface by using a spring or the like, and the contact portion allows the contact portion after passing between the rolls. It is configured to peel the paper from the roll. Also,
In such a peeling device, the contact tip of the peeling claw that is pressed against the roll surface is worn or sometimes broken, so that the peeling claw is replaced as necessary.

However, when exchanging the peeling claw, it is necessary to remove or attach the entire peeling claw from the supporting shaft or the like, and at the same time, fix the position of the peeling claw pressing spring and the peeling claw. It is necessary to remove and attach various accessory parts such as work pins, and therefore, a lot of man-hours and time are required to replace them. Further, in this type of device, as the peeling claw, a device in which the contact portion has a wedge (or blade) shape having a predetermined width in the roll width direction is often adopted. Since the contact tip of the peeling claw with such a shape contacts the roll surface in a linear state or a surface state, the contact conditions such as the contact angle (parallelism with the roll surface) and the contact pressure have appropriate values. It is necessary to finely adjust so that the contact state with the roll surface is always uniform. If the contact angle, contact pressure, or the like of the peeling claw is not set correctly, a one-sided contact phenomenon or a phenomenon of biting into the roll by the peeling claw may occur, resulting in defective peeling or failure. Therefore, when exchanging such a peeling claw, it is necessary to make fine adjustments such as the contact angle and the contact pressure each time, and this also tends to further increase the work content and time during the replacement. there were. In addition, since the fine adjustment of the peeling claw is necessary, the adjustment result sometimes varies between before and after replacement or between the peeling claws, resulting in a slight change in the peeling performance.

On the other hand, conventionally, there has been proposed a sheet peeling device having a peeling claw having a detachable structure in which a contact member with the surface of a roll is screwed (JP-A-53-70).
No. 827). The abutting member is a spacer for allowing the blade (peeling member) to approach the roll surface at a constant distance and does not directly exert a peeling action. However, in this device, since the tip shape of the contact member is the same wedge shape as the above-mentioned peeling claw, various fine adjustments are necessary to satisfy the contact condition when mounting the contact member.
It takes a lot of work steps and time to replace them, and
When the fine adjustment is inaccurate, there is a problem such as peeling failure.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its purpose is to enable easy and quick replacement of the peeling claw, and to always provide stable and good peeling performance. The purpose of the present invention is to provide a paper peeling device that can obtain the above.

[0006]

A paper peeling device of the present invention is a paper peeling device provided with a peeling claw for abutting a roll surface to peel a sheet conveyed from the roll, wherein the peeling claw is a support body. And a claw member detachably attached to the support body, and the claw member has at least a tapered tip end portion that comes into point contact with the roll surface. is there.

The paper peeling claw is divided and formed by the support body and the claw member, and in particular, the claw member can be easily attached to or removed from the support body. The support body is not particularly limited as long as it has a structure in which at least the claw member is detachably attached.

Further, in the claw member constituting the paper peeling claw, the form having at least a tapered tip end portion which comes into point contact with the roll surface means a state close to a "point" when brought into contact with the roll surface. It has a shape configuration that has at least a tip end portion that can be contacted with, specifically, a conical shape, a polygonal cone shape, or an indefinite shape with a needle-like tip member attached to the base portion, etc. Is.

[0009]

In the apparatus of the present invention, the paper peeling claw has a structure in which the claw member is detachably attached to the support body. Therefore, when replacing the paper peeling claw, it is not necessary to remove the entire paper peeling claw, but simply , It suffices to remove only the claw member from the support body and replace it with a new one. Also,
Since the claw member comes into point contact with the roll surface, a constant and uniform contact state is always secured. Therefore, it is not necessary to finely adjust the contact angle (parallelism with the roll surface) and the like as in the conventional product that contacts in a line state or a surface state.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the paper peeling device of the present invention is applied to a fixing device of a copying machine, and FIG. 2 is an exploded perspective view of a paper peeling claw in the paper peeling device.
In the figure, 1 is a paper peeling claw in a paper peeling device, 2 is a heating roll in a fixing device, 3 is an opposing roll provided in a pair with the heating roll 1, and 4 is a copy paper having a toner image after transfer formation.

The sheet peeling claw 1 is composed of a support body 5 and a claw member 6, and the support body 5 is rotatably supported by a support shaft 7 provided on a machine body (not shown). At the same time, a spring 8 is stretched over the support body 5 so that the claw member 6 contacts the heating roll 2 at a constant pressure, so that the tip of the claw member 6 is installed so as to contact the surface of the heating roll 1. There is. Further, the peeling claws 1 are provided in a predetermined number in the roll width direction at predetermined intervals.

As shown in FIG. 2, a bearing hole 9 for axially supporting the support shaft 7, a mounting hole (female screw hole) 10 for mounting the claw member 6, and the spring 8 are stretched on the support body 5. A locking hole 11 for locking is provided.

As shown in FIGS. 2 and 3, one of the claw members 6 is composed of a peeling portion 12 that comes into contact with a roll to peel the paper, and a connecting portion 13 that is detachably attached to the support body 5. Has been done. The peeling portion 12 is formed into a conical shape with polyamide imide or the like. Also, the connection part 1
3 is formed by a male screw corresponding to the mounting hole 10 of the support body 5, and the connecting portion 13 is connected to the mounting hole 10 of the support body 5.
The claw member 6 is attached to the support body 5 by being screwed into.

According to the paper peeling device of this embodiment having such a paper peeling claw 1, the copy paper 4 having the unfixed toner image passes between the heating roll 2 and the opposing roll 3 in the fixing device. At this time, the copy paper 4 when wrapped around the heating roll 2 can be separated from the roll 2 by the tip of the claw member 6. At this time, since the claw members 6 are in point contact with the surface of the heating roll uniformly, the claw member 6 can be peeled off very well.

Further, in this peeling device, the claw member 6
When the tip of the roller wears due to sliding contact with the roll surface or is damaged due to an unexpected load with the roll surface, the claw member is replaced. After the removal, a new claw member is screwed onto the support body 6 and attached to complete the work process. And
At this time, fine adjustment of the contact angle of the claw member 6 is unnecessary,
Simply attaching a new pawl member to the support body 5 always ensures the same contact state.

In this embodiment, the claw member 6 and the support body 5
An example in which the attachment and connection with and is performed by the screw method is shown, but the invention is not limited to this. For example, a hook method or the like can be adopted to connect the both. FIG. 4 shows the claw member 6 including the connection portion 13 that adopts the hook method. 14 in the figure
Indicates a hook locking groove, and in this embodiment, the hook groove 14
The corresponding hook is provided in the mounting hole 10 of the support body 5.

When the hook member 6 and the support main body 5 are connected by this hook method, the hook member 6 can be slightly rotated with respect to the support main body 5 at the same position. The contact tip portion of the member 6 can be changed to a non-contact tip portion. Therefore, by changing the contact portion of such a claw member as necessary, the claw member can be continuously used, and as a result, the useful life of the claw member 6 itself can be extended.

Further, in the above embodiment, the paper stripping device for the heating roll 2 is exemplified, but the stripping device of the present invention can be applied as a stripping device for the pressure roll in the fixing device, and also in this case, the same stripping performance is exhibited. It is possible to

[0019]

According to the present invention, since the paper peeling claw is divided into the claw member and its supporting body, the used paper peeling claw can be replaced by removing the used claw member from the supporting body. It is only necessary to attach a new claw member, and it can be performed very easily and quickly.

Further, since the claw member is in point contact with the roll surface, a constant and uniform contact state with the roll surface is secured, and as a result, good peeling performance is stably obtained. Moreover, when mounting the claw member,
Since the fine adjustment of the contact angle (horizontality) etc. unlike the conventional product is not required, the work contents at the time of exchanging the paper peeling claw are further simplified, and the exchanging work can be performed in a short time.

Further, in the conventional peeling claw, since the contact with the roll surface is made uniform, extremely high processing accuracy is required at the time of manufacture thereof, whereas the claw member of the present invention has at least a point at its tip. It is only necessary to process to a tapered shape that can be contacted in the state, and the processing accuracy of the conventional product is not required, so the manufacturing is easy.

The apparatus of the present invention as described above is suitable as a peeling device for a fixing device of a copying machine, but it can be used as a peeling device for a photoconductor or the like of a copying machine.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment in which a paper peeling device of the present invention is applied to a fixing device of a copying machine.

FIG. 2 is an exploded perspective view showing a sheet peeling claw in the present embodiment.

FIG. 3 is a side view showing a claw member in the present embodiment.

FIG. 4 is a side view showing another example of the claw member.

[Explanation of symbols]

1 ... Paper peeling claw, 2 ... Heating roll, 3 ... Opposing roll, 4
... copy paper, 5 ... support body, 6 ... claw member.

Claims (1)

[Claims] 1. A paper stripping device having a stripping claw for abutting against a roll surface to strip a sheet conveyed from the roll, wherein the stripping claw includes a support body and a claw member detachably attached to the support body. And a claw member at least having a tapered tip end portion that comes into point contact with the roll surface.