JPH037950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fixing device for a copying machine.

(Prior art) The heat roll fixing device in a conventional copying machine is the first
As shown in the figure, a support member 4 is rotatably provided using a shaft 3 at the rear diagonal upper part of the fixing unit, which is composed of a heating roll 1 and a pressure roll 2 arranged in a pair above and below in the machine. A paper guide plate 5 is provided at the bottom of the member 4.
At the same time, a paper peeling claw 7 is attached to the tip of the paper guide plate 5 using a mounting plate 6, and the cutting edge of the peeling claw 7 is arranged so as to touch one outer periphery of the rear lower part of the heating roll 1. Accordingly, the paper, which is conveyed with the toner image formed on the surface of the photoreceptor in an unfixed state at a transfer point of the photoreceptor (not shown), is transferred between the heating roll 1 and the pressure roll 2. After being fixed by heat-pressing and being peeled off from the surface of the heating roll 1 by a peeling claw 7, the sheet is conveyed along a paper guide 5 to a discharge roll section (not shown). However, in the fixing device having such a structure, a paper jam occurs in the roll portion, and in order to remove the paper jam, the support member 4 to which the peeling claw 7 is attached is rotated upward about the shaft 3, and the paper is removed from the paper ejection port. When the peeling claw 7 is unfolded, the cutting edge of the peeling claw 7 faces in the direction to remove the paper, and when the operator tries to insert his hand behind the heating roll 1 and the pressure roll 2 to remove the paper, It had the disadvantage of causing serious injuries if it came into contact with it.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the conventional fixing device described above. When the claw is set in the heating roll part, a connecting rod is fixed with a stopper to prevent the cutting edge from biting into the roll, and
A support member having a stopper pin installed horizontally is provided at a suitable position on the upper part of the frame of the fixing device itself, and when the support member equipped with the peeling claw is opened toward the maximum open position, a lever attached to the support member is rotated. When the lever is moved and comes into contact with the stopper pin, the stopper provided on the lever presses a part of the peeling claw, causing the cutting edge to face downward, so that the operator can use the peeling claw to hold the paper in his hand while removing the paper. It is an object of the present invention to provide a fixing device for a copying machine that prevents injury and facilitates the work.

(Structure of the Invention) The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 3 is a sectional side view showing an embodiment of the fixing device of the present invention.

A support plate 11 and a pin 12 are provided at appropriate positions diagonally above the rear of the fixing unit, which is composed of a pair of upper and lower heating rolls 9 and 10 arranged in the frame 8 of the fixing device.
The support member 14 to which the peeling claw 13 is rotatably attached using a shaft 15 is rotatably attached using a shaft 15.
One end of a lever 17 is rotatably attached to the supporting member 14 and the paper guide plate 16 attached to the lower part of the supporting member 14 using a shaft 18. A connecting rod 19 that rotates is provided, and a stopper 20 is provided at the tip of the connecting rod 19 to prevent the cutting edge of the peeling claw 13 from biting into one outer circumference of the heating roll 9. In addition to contacting a part of the roll side, the other end of the lever 17 and the support member 14
By providing a tension spring 21 between the peeling claw 13 and the shaft 15 side, the cutting edge of the peeling claw 13 is prevented from biting into the heating roll 9. Furthermore frame 8
A support member 23 with a stopper pin 22 of the lever 17 is provided at the maximum release position of the support member 14 in the upper part of the lever 17 .

The present invention is constructed as described above. Next, its operation will be explained.

As shown in FIG. 4, when the support member 14 is rotated about the shaft 15 to the maximum release position, the lever 17 also rotates, and the lever 17 hits the stopper pin 22 of the support member 23 and is pulled. The rotation is stopped in a substantially horizontal position against the elasticity of the spring 21. When this lever 17 stops in a horizontal position, a connecting rod 19 provided on the lever 17 rotates about the shaft 18, and a stopper 20 provided at the tip of the connecting rod 19 moves the peeling claw 13
By extruding a part of the blade, it is rotated about the pin 12 so that the cutting edge is directed downward.

As explained above, in the fixing device of the present invention, when the support member 14 is rotated to the maximum release position and opened, the cutting edge of the peeling claw 13 is automatically moved by the lever 17, the connecting rod 19 connected thereto, and the stopper 20. Since the paper is facing downward and the paper ejection port is wide open, it is easier for the operator to remove jammed paper, and at the same time, the operator does not have to touch the peeling claw with his/her hands, thus making it easier for the operator to remove jammed paper. This has the effect of not only preventing injuries, but also ensuring sufficient safety during maintenance and inspection of the device itself.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing the conventional fixing device in use, FIG. 2 is a cross-sectional side view showing the same state during paper removal work in the event of a paper jam, and FIG. 3 is the fixing device of the present invention. FIG. 4 is a cross-sectional side view showing one embodiment of the apparatus, and FIG. 4 is a cross-sectional side view showing the state during paper removal work when a paper jam occurs. In the figure 8...Frame, 9...Heating roll, 10
... Pressure roll, 11 ... Support plate, 12 ... Pin, 13 ... Peeling claw, 14 ... Support member, 15 ...
... shaft, 16 ... paper guide plate, 17 ... lever,
18... Shaft, 19... Connection rod, 20... Stopper, 21... Tension spring, 22... Stopper pin, 23... Support member.

Claims (1)

[Claims] 1. When attaching a supporting member rotatably about a shaft using a shaft, the supporting member is rotatably provided with a peeling claw at the rear diagonal upper part of the fixing unit, which is composed of a pair of upper and lower heating rolls and a pressure roll placed at appropriate positions in the frame. One end of the lever is rotatably provided at a suitable location, a connecting rod is attached to the lever, and a stopper is provided at the tip of the connecting rod to control the contact state of the peeling claw to the heating roll. A spring is provided between the other end and the axial direction of the support member to keep it pulled in the axial direction, and a support member equipped with a stopper pin is provided at the maximum release position of the support member at the top of the frame. By providing this, when the support member having the peeling claw is rotated to open upward, one side of the lever comes into contact with the stopper pin at the maximum open position of the support member having the peeling claw, thereby limiting the rotation range. A fixing device for a copying machine, characterized in that the range in which one side of the peeling claw is pressed by the stopper of the connecting rod is also regulated so that the cutting edge of the peeling claw faces downward. .