JPS6118525Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peeling device for a sheet-like material such as a transfer paper that is in close contact with a photosensitive drum or a fixing roll in an electrophotographic copying machine or the like.

Conventional peeling devices of this type are classified into three types: those in which the tip of the peeling claw constantly contacts the cylindrical surface of the photosensitive drum or the like on which the transfer paper is closely conveyed, those in which the tip contacts intermittently, and those in non-contact type.

For example, when applying it to the surface of a photosensitive drum, the tip of the peeling claw should be as sharp as possible in order to minimize damage to the unfixed toner image.

Due to these requirements, a constant contact type peeling nail can reliably peel off the transfer paper, but there is a high possibility of damaging the photosensitive layer on the drum surface.

On the other hand, a non-contact type with a peeling nail tip does not damage the photosensitive drum surface, but it is necessary to keep the gap between the peeling nail tip and the photosensitive drum surface at 50% or less of the transfer paper thickness, and adjusting this gap is difficult. Also, the peeling of the transfer paper was uncertain.

The present invention was developed in view of the above circumstances, and its purpose is to facilitate the gap adjustment between the back surface of the peeling claw and the rotating cylinder, and to ensure that the sheet-like material can be peeled off reliably. An object of the present invention is to provide a sheet-like material peeling device capable of minimizing damage to the surface of a rotating cylinder.

Hereinafter, the present invention will be explained with reference to the drawings. The basic concept of the present invention is shown in FIG. 1st
In the figure, the back surface of the peeling claw b is in contact with the surface of a rotating cylinder a such as a photosensitive drum along the tangent line, and the peeling claw b is moved a distance If the tip is made to protrude, a gap of t can be obtained.

Therefore, since the gap t can be adjusted by simply sliding the tip of the peeling claw against the holding part, this adjustment can be performed easily, reliably, and delicately. In addition, if an appropriate anti-friction treatment is applied to the contact part of the back of the peeling claw b to the surface of the rotating cylinder a, the rotating cylinder a
Damage to the photosensitive layer can also be minimized.

An embodiment based on the above basic idea will be described with reference to FIG. 2 and subsequent figures. In the drawing, reference numeral 5 denotes a holder, and a notch 7 is formed at the tip of the holder 5, and a bracket 6 is provided protruding from the holder 5. The bracket 6 is attached to a machine frame (not shown) by a shaft pin, and the holder 5 swings toward the rotating cylinder a using the shaft pin as a fulcrum.

A presser ring 99 is fitted to the rear end of the holder 5, and the shaft 4 is slidably mounted on the presser ring 9. A peeling claw 1 is fixed to the tip of the shaft 4. This peeling claw 1 has a back member 1b attached to a plate material 1a having a sharp tip and abdomen, and a member 2 having a small friction coefficient and wear resistance, such as Teflon tape, is attached to the back member 1b. .

A in the drawing is a fine adjustment mechanism, and this fine adjustment mechanism A includes a spring bearing ring 8 provided on the shaft 4.
A spring 10 is interposed between the spring receiving ring 8 and the holding ring 9. Further, an adjustment ring 11 is screwed onto the screw portion 3 at the rear end of the shaft 4.
This rotation of the adjustment ring 11 causes the shaft 4 to retreat against the spring 10, and the rear end of the plate 1a of the peeling claw 1 is inserted into the notch 7.

The sheet-like material peeling device constructed in this manner is pressed against the surface of the rotating cylinder a via the anti-friction member 2 by an appropriate spring force.

Then, by rotating the adjustment ring 11, the peeling claw 1 is moved to adjust the length of the distance x, and the gap t is finely adjusted to 50% or less of the thickness of the sheet-like material.

Note that a plurality of sets of sheet-like material peeling devices according to the present invention may be arranged in line at the peeling positions. In this case, it becomes necessary to adjust all the sheet-like material peeling devices, but the adjustment is easy.

In addition, only one sheet-like object peeling device according to the present invention is provided on the peeling line, and an appropriate number of non-contact peeling claws are provided on the surface of the photosensitive drum at an angle with respect to the axis of the photosensitive drum. The peeled portion of the sheet-like object that has been reliably peeled off at one point by the object peeling device may be enlarged.

As described above, in the present invention, the notch 7 is formed at the tip of the holder 5, and the presser ring 9 is fitted to the rear end of the holder 5.
A peeling claw 1 is provided at the tip of the shaft 4, an adjustment ring 11 is screwed onto the threaded portion 3 at the rear end of the shaft 4, and a spring bearing ring is attached to the shaft 4. 8 is fixedly installed, and a spring 10 is interposed between the spring receiving ring 8 and the holding ring 9, so that the shaft 4 can be adjusted by rotating the adjusting ring 11.
The rear end of the peeling claw 1 is inserted into the notch 7 through the spring 10 and against the spring 10, and the rear end of the peeling claw 1 is formed into a straight line along the tangent of the rotating cylinder a, and the peeling claw The vicinity of the contact point P with the rotating cylinder a on the back surface of the peeling claw 1 is made of a member 2 that has wear resistance and reduces the coefficient of friction, and the tip of the peeling claw 1 is made to protrude a little beyond the contact point P, thereby forming a sheet-like material. This sheet-like material peeling device is characterized in that a gap t, which is less than half the thickness of the material, is provided between the back surface of the peeling claw 1 and the surface of the rotating cylinder a.

Therefore, by rotating the adjustment ring 11, the peeling claw 1 can be moved to adjust the length of the distance x, and the gap t can be finely adjusted to 50% or less of the thickness of the sheet material.

Therefore, the gap between the back surface of the peeling claw 1 and the rotating cylinder a can be easily adjusted, the sheet material can be surely peeled off, and damage to the surface of the rotating cylinder can be minimized.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the basic concept of the sheet-like material peeling device according to the present invention, Fig. 2 is a longitudinal sectional view of an embodiment of the present invention, Fig. 3 is a plan view of the holder, and Fig. 4 is a
Figure 5 is a cross-sectional view along the line, Figure 5 is a view taken from the direction of Figure 3, Figure 6 is a plan view of the shaft and peeling claw, Figure 7 is a side view of the same, Figure 8 is a plane view of the retainer ring. 9 is a cross-sectional view taken along the line in FIG. 8, FIG. 10 is a plan view of the adjustment ring, and FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 1 is a peeling claw, 2 is a member, a is a rotating cylinder, 5 is a holder, and A is a fine adjustment mechanism.

Claims (1)

[Scope of utility model registration request] A notch 7 is formed at the tip of the holder 5, and a presser ring 9 is fitted to the rear end of the holder 5, and the shaft 4 is slidably provided on the holder 5 via the presser ring 9. A peeling claw 1 is provided at the tip, an adjustment ring 11 is screwed onto the terminal 3 at the rear end of the shaft 4, a spring receiver ring 8 is fixed to the shaft 4, and the spring receiver ring 8 is held by a ring 9.
A spring 10 is interposed between the adjustment ring 11 and
, the rear end of the peeling claw 1 is inserted into the notch 7 via the shaft 4 and against the spring 10, and the rear end of the peeling claw 1 is aligned in a straight line along the tangent to the rotating cylinder a. At the same time, the vicinity of the contact point P of the back surface of the peeling claw 1 with the rotating cylinder a is constructed with a member 2 that has wear resistance and reduces the coefficient of friction, and the tip of the peeling claw 1 is made to protrude slightly beyond the contact point P. In some cases, the gap t is less than half the thickness of the sheet material.
A sheet-like material peeling device characterized in that a peeling claw 1 is provided between the back surface of the rotating cylinder a and the surface of the rotating cylinder a.