JPH0229220B2 - TEICHAKUSOCHI - Google Patents

Description

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

(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.
By arranging the cutting edge of the peeling claw 7 so as to touch one outer periphery of the rear lower part of the heating roll 1, the toner image formed on the surface of the photoreceptor at a transfer point (not shown) of the photoreceptor is undefined. The sheet transferred in a fixed state is fixed by heating and pressing between the heating roll 1 and the pressure roll 2, and is peeled off from the surface of the heating roll 1 by the peeling claw 7, and then transferred to the paper guide 5. The paper was configured to be conveyed along the same line to a discharge roll section (not shown). However, in the fixing device having such a configuration, a paper jam occurs below the peeling claw 7, and in order to remove the paper jam, the peeling claw 7 is attached and the support member 4 is rotated upward about the shaft 3 as a fulcrum to remove the paper. When the ejection opening is widened, the cutting edge of the peeling claw 7 faces in the direction to remove the paper, and the operator has to insert his hand behind the heating roll 1 and the pressure roll 2 to remove the paper. It had the disadvantage that it could cause 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 arranging a paper guide plate using a mounting member, a horizontal slide hole is bored at an appropriate position in the mounting member of the guide plate, and a support plate is provided on the guide plate side of the slide hole. The support plate is provided with a pin that fits into the slide hole of the mounting member and slides through the slide hole, and a stopper is provided at a suitable position on the upper part of the frame of the fixing device itself, thereby supporting the peeling claw. When the member is rotated upward about the axis,
The rear end of the guide plate touches the stopper and slides forward, and when it slides, the tip of the guide plate protrudes in front of the peeling claw and covers it, allowing the operator to remove the jammed paper. To provide a fixing device for a copying machine which is easy to perform work when taking out and prevents an operator's hand from touching the cutting edge of a peeling claw and causing injury during 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 peeling claw 11 is attached using a support plate 12 in an inverted concave shape at the rear diagonal upper part 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 support member 13 is rotatably attached to one end thereof using a shaft 14.
A paper guide plate 15 is provided behind the peeling claw 11.
A connecting plate 16 is provided, and slide holes 17 and 18 are horizontally formed in two rows in the middle part of the connecting plate 16, and a supporting plate 19 is attached to the paper guide plate 15. are provided with 20 and 21 which are fitted into the slide holes 17 and 18 of the connecting plate 16 to connect the paper guide plate 15 itself to the connecting plate 16 and to enable it to slide.
A tension spring 22 is installed between the rear end of the paper guide plate 1 and the rear end of the connecting plate 16.
5 is always drawn to the rear of the support member 13. On the other hand, a stopper 2 is provided at a suitable position on the upper part of the frame 8.
3 is provided so that when the support member 13 is rotated upward about the shaft 14, the rear end of the paper guide plate 15 comes into contact and pushes it forward.

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

The peeling claw 11 is normally arranged so that the supporting member 13 is supported by the shaft 14 so as to be in contact with one outer periphery of the rear lower part of the heating roll 9, as in the conventional fixing device shown in FIG. At this time, the paper guide plate 15 is pulled rearward by the tensile force of the tension spring 22, so that its tip is located somewhat rearward than the cutting edge of the peeling claw 11.
Then, a paper jam occurs in the fixing device, and in order to remove it, the operator rotates the support member 13 upward about the shaft 14 and turns it upside down.
When the rear end of the paper guide plate 15 comes into contact with a stopper 23 provided on the upper part of the frame 8, the paper guide plate 15 is pushed in the direction shown by the arrow against the elasticity of the tension spring. As a result, the tip of the paper guide plate 15 protrudes in front of the cutting edge of the peeling claw 11 and covers it, so that even if the operator inserts his/her hand into the paper outlet, the cutting edge of the peeling claw 11 will not be touched. There will be no.

(Effects of the Invention) As explained above, the present invention provides a slidable paper guide plate, which has been fixed to a supporting member to which a conventional peeling claw is attached, and uses this to remove paper that has caused a paper jam. When the paper outlet is opened for this purpose, the rear end comes into contact with a stopper 23 provided at the top of the frame 8 and protrudes forward, covering the tip of the peeling claw 11 to prevent it from being touched by the operator's hand. Although the structure is extremely simple, it is effective in ensuring sufficient safety, and requires only a slight modification to the conventional paper guide plate during production. Therefore, there is no need to increase the cost, and the sliding of the paper guide plate 15 is done by the support member 13.
Since this can be done automatically by opening and closing the paper ejection port, there is also the advantage that there is no need to place an extra psychological burden on the operator when removing paper from a paper jam in the fixing device. .

[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. 2 is a cross-sectional side view showing one embodiment of the device in use when removing a paper jam. In the figure 8...Frame, 9...Heating roll, 10
... Pressure roll, 11 ... Peeling claw, 13 ... Support member, 14 ... Shaft, 23 ... Stopper.

Claims (1)

[Claims] 1. A paper guide is installed at the bottom of a support member that is rotatably provided on a shaft and has a paper peeling claw behind the fixing unit, which is composed of a pair of upper and lower heating rolls and a pressure roll that are placed at appropriate positions in the frame. When installing the plate, the paper guide plate is provided so as to be able to automatically slide relative to the support member using a spring or the like, and a stopper is provided at a suitable position above the frame to remove jammed paper. When the supporting member of the peeling claw is rotated upward to open the paper ejection port, the rear end of the paper guide plate comes into contact with the stopper, and this is slid forward, so that the cutting edge of the peeling claw is inserted into the paper guide. A fixing device characterized in that a tip portion is covered.