JP3073577B2 - Paper separation claw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a sheet separating claw in a sheet separating means provided in an image forming apparatus such as an electrostatographic copying machine or a facsimile.

[0002]

2. Description of the Related Art For example, as a paper separating claw of a paper separating means provided in an electrostatographic copying machine, JP-A-59-29281 is known.
As shown in the publication, a claw member for separating the paper from the surface of the rotating body is configured separately from the claw body, and the claw member is screwed to a cradle of the claw body. is there.

[0003]

According to such a configuration,
The paper separation performance can be economically maintained by replacing only the claw members.However, since the claw placement space is small and the claw members require tools such as a screwdriver to replace the claw members, the claw replacement work is It was very difficult and time-consuming, and there was a risk of accidentally scratching the surface of the rotating body with a tool. SUMMARY OF THE INVENTION An object of the present invention is to provide a paper separating claw in which a claw member can be easily and simply replaced in a short time without a tool by a simple improvement.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sheet separating claw having a sheet separating claw member detachably provided on a claw body. A locking member for the left and right sides is provided on the receiving base of the claw body, and a locking member for the rear side of the claw member is provided on a receiving base portion which is provided at the rear of the receiving base and which can be flexibly deformed up and down. It is characterized in that the locking of the claw member rear portion by the stop member can be released, and hook portions for preventing the claw member from rising are formed on the left and right locking members.

[0005]

According to the above-mentioned characteristic structure, the claw member is pulled out from the claw body by bending the cradle portion and releasing the locking of the claw member rear portion by the rear-side locking member. . Alternatively, the claw member with respect to the claw body may be bent by bending the cradle portion, inserting the claw member between the left and right locking members from behind, and locking the rear locking member to the rear portion of the claw member. Is achieved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sheet separating means for separating a sheet from the surface of a rotating body 1 such as a photoconductor or a fixing roller. In the figure, reference numeral 2 denotes a rotating shaft which is rotated forward and backward by a solenoid 4 via an arm 3, one end of which is slidably supported on one of side plates 5, 6 provided on both sides of the rotating body 1, The other end is slidably supported by a rod-shaped member 7 provided on the other of the side plates 5 and 6.

Reference numeral 8 denotes a paper separating claw whose tip abuts against the surface of the rotating body by its own weight based on the weight of the weight portion 21, and is rotatable at predetermined intervals in the axial direction with respect to the rotating shaft 2. Is held. Reference numeral 9 denotes an operation member for separating the claw tip from the surface of the rotating body 1 as the rotating shaft 2 rotates in one direction, and is provided on the rotating shaft 2 so as to contact the lower side of the weight portion 21. Have been.

Reference numeral 10 denotes a cam mechanism for moving the rotary shaft 2 in the axial direction against the urging force of the spring 11 as the rotary shaft 2 rotates in the other direction. A cam member 12 is provided on the rotating shaft 2 via a one-way clutch (not shown) that transmits only a rotating motion in the
The other side plate 6 is provided with a cam follower 13 that locks the spiral ratchet surface formed on the other side plate 12.

According to the above configuration, the forward and reverse rotation of the rotation shaft 2 causes the leading end of the sheet separating claw 8 to contact and separate from the surface of the rotating body, and the other direction of the rotation shaft 2. As the cam follower 13 moves relatively over the top of the ratchet surface, the turning shaft 2
Is slightly moved in the axial direction against the urging force, thereby changing the contact position of the tip of the paper separating claw 8 with the surface of the rotating body, thereby suppressing local deterioration of the rotating body surface. .

[0010] As shown in FIG.
A claw body 16 having a notch 15 formed in a boss 14 attached to the rotation shaft 2, and a claw member 17 elastically fitted and held in the claw body 16, through the notch 15 It is configured to be easily mounted on the rotating shaft 2 from the radial direction.

More specifically, the claw portion 17 is made of a highly wear-resistant resin such as a polyimide resin, and has a triangular rib 19 protruding from a flat seat plate 18. A claw body 20 having a sharp tip is projected from the front side of the rib 19. On the other hand, the claw body 16 is made of an inexpensive material having excellent elasticity and creep characteristics, for example, a relatively inexpensive resin such as POM (polyacetal) or PA (polyamide). The claw member is extended on the opposite side to the weight portion 21.
A cradle 22 for the cradle 17 is extended, and a cradle portion 23 which can be flexibly deformed up and down is connected to a rear portion of the cradle 22.

A locking member a, which restricts the front, rear, left and right movements of the claw member 17, is provided on the front and rear portions of the front and left and right sides of the cradle 22, and on the upper surface of the cradle portion 23, respectively.
, c are provided, and hook portions d for preventing the claw members 17 from floating are formed on the left and right locking members b.

As shown by the imaginary line in FIG. 3, the cradle portion 23 is bent to release the locking of the locking member c with respect to the rear portion of the seat plate 18 of the claw member 17. The claw portion 17 can be easily pulled out behind the claw body 16.
Alternatively, the cradle portion 23 is bent, and the claw member 17 is inserted between the left and right locking members b, b from behind the claw body 16;
Further, the locking of the claw member 17 to the claw body 16 is achieved by locking the locking member c on the rear side to the rear portion of the claw member 17.

[0014]

As described above, according to the present invention, the simple operation of bending the cradle portion can be performed in a short time and with no need to use a tool, so that there is no need to worry about damaging the surface of the rotating body. The attachment and detachment of the claw member is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sheet separating unit.

FIG. 2 is an exploded perspective view of a sheet separating claw.

FIG. 3 is a side view of a sheet separating claw.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating body, 2 ... Rotating shaft, 16 ... Claw body, 17 ... Claw part.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 15/14 101 G03G 15/00 510 G03G 15/20 106

Claims (1)

(57) [Claims] 1. A sheet separating claw having a claw body detachably provided on a claw body for separating a sheet from a surface of a rotating body, wherein a locking member for a front portion side and both right and left sides of the claw member is a claw body. And a locking member for the rear side of the claw member is provided on a vertically deformable and deformable cradle portion connected to the rear portion of the cradle so that the locking member can lock the rear portion of the claw member. A sheet separating claw, which is configured to be releasable and has hook portions formed on left and right locking members to prevent lifting of the claw members.