JPH047512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Scope 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 trying to spread out the jammed paper, the support member 4 has a neutral position, and in this position, even if the operator releases his/her hand, the support member 4 remains stationary as shown in FIG. Although the removal work tends to be carried out in this state, performing the above-mentioned work with the supporting member 4 in such an unstable state means that the peeling claw 7 may be damaged by vibration during the work.
The drawback was that there was a very high possibility that the machine would fall and there was a high risk of injuring the operator's hands.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the conventional fixing device described above.The present invention is made by attaching a spring or the like to the supporting member of the peeling claw to lower the neutral position of the supporting member. In this position, the operator cannot insert his/her hand into the device, and when the support member is lifted upwards even slightly beyond this neutral position, the action of the spring acts and automatically returns to the maximum open position. It is an object of the present invention to provide a fixing device which makes it easy to take out jammed paper by rotating the fixing device up to a maximum angle, and which prevents an operator from injuring his hands or the like during the operation.

(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 peeling claw 11 is attached to a supporting plate 12 at the upper rear side of the fixing unit, which is composed of a pair of upper and lower heating rolls 9 and a pressure roll 10 arranged in the frame 8 of the fixing device.
A supporting member 14 having an inverted concave shape and having a paper guide plate 13 attached to the lower part thereof is fixed to a shaft 15 using a shaft 15.
A tension spring 16 is provided at a suitable position on the back surface of the support member 14 and at a suitable position on the upper side of the frame 8, so that a toggle effect is exerted on the rotation of the support member 14. .

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

Suppose that a paper jam occurs in the fixing device. In order to remove this, the operator pulls up the support member 14 of the peeling claw 11 to open the outlet. At this time, even if the supporting member 14 is stopped at the neutral point of arrow A as shown in FIG. The distance between the support member 14 and the provided paper guide plate 17 is narrow, and the operator cannot insert his hand into the roll portion, so the operator has to pull the support member 14 further upward. Then, when the operator touches the support member 14 by pulling the support member 14 slightly above the neutral point position or inserting his/her hand into the outlet, the support member 14
is 13 in the figure due to the elasticity of the tension spring 16.
It will automatically rotate to the maximum open position shown in Figure 3, and the outlet will be opened to its maximum extent.

The present invention is constructed and operates as described above, and uses the tension spring 16 to support the support member 1.
4 has been lowered to a neutral position, and the operator cannot insert his hand into the device at this position, so it is natural that paper removal work cannot be done at this position, and therefore the operator is unable to remove the paper. There is no risk of injury to the hand caused by the nails 11,
Furthermore, when the support member 14 is lifted upward beyond this neutral point even slightly, the action of the tension spring 16 is activated and the support member 14 rotates to the maximum release position.
Since it is fixed there, this support member will not fall during paper removal work, and the operator's safety during the paper removal work is therefore sufficiently ensured and the operator can work with peace of mind. have

[Brief explanation of drawings]

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 of 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 ... Peeling claw, 12 ... Support plate, 13 ... Paper guide plate, 14 ... Support member,
15... shaft, 16... tension spring.

Claims (1)

[Claims] 1. A fixing section consisting of a heating roll and a pressure roll, a frame surrounding this fixing section, a peeling claw that comes into contact with the heating roll to prevent the sheet from being rolled in, and a frame that supports this peeling claw and that is attached to the frame. an elastic member rotatably provided against the
The elastic member applies a force in the direction in which the peeling claw and the supporting member open when the peeling claw and the supporting member are rotated beyond a neutral point where the peeling claw and the supporting member are rotated in a direction in which the peeling claw and the supporting member are opened by a predetermined angle from the fixing part. A fixing device characterized in that, when the support member is at a neutral point, the distance between the peeling claw and the frame is set to be less than or equal to a gap that prevents a human hand from entering.