JPH0332793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a fixing device for an electronic copying machine in which a pressure roll is brought into pressure contact with a fixing roll provided in the fixing device.

Prior Art Conventionally, as a fixing device for an electronic copying machine, a fixing roll equipped with a heater is brought into pressure contact with a sheet of paper to be fixed using a pressure roll, so that the toner image on the sheet is thermally fixed to the sheet. be.

In the above-mentioned fixing device, a pressure roll that is biased by a biasing means such as a spring is brought into pressure contact with the fixing roll, and if a paper jam occurs, the biasing force of the biasing means can be released using a lever or the like. Therefore, the pressure roll is separated from the fixing roll to remove the jammed paper, or the paper jam is detected by a detector, and the pressure of the pressure roll is released based on the obtained signal. However, the former method has the disadvantage that the operation is complicated, and the latter method has disadvantages such as requiring space for a detector, having a complicated structure, and being expensive.

Purpose of the Invention The present invention was made with the aim of improving the above drawbacks, and is a fixing device for an electronic copying machine in which the pressure roll can be automatically pressurized and released by attaching and detaching the paper feeder. This allows you to remove jammed paper without any troublesome operations.

Structure of the Invention A fixing roll and a pressure roll are provided in a paper feeding device that can be taken in and out of the copying machine main body, and a biasing means for biasing the pressure roll is provided at the tip of a swinging lever provided in the paper feeding device. At the same time, the roll provided on the swinging lever rolls on the guide rail, which is higher at the back of the main body and lower at the paper feeder entrance/exit side, so that the paper feeder can be removed from the main body. A fixing device for an electronic copying machine that allows pressure rolls to be brought into contact and released by simply inserting the device.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the figure, 1 is the main body of the copying machine, 2 is the main body 1
It is a paper feeding device that can be freely taken in and out, and sheets (not shown) are stored in a stacked state inside. Guide rails 3 are installed on both sides of the lower part of the paper feeder 2, and the guide rails 3 are supported by guide rails 4 provided on the main body 1 side to guide the insertion and removal of the paper feeder 2. In addition, a fixing roll 5 and a pressure roll 6 are provided above the paper feeding device 2. The fixing roll 5 has an internal heat source (not shown), and is configured to thermally fix the toner image on the paper pressed by the pressure roll 6 onto the paper. Further, one end of the pressure roll 6 is rotatably attached to a support member 8 rotatably supported by a support shaft 7 on the side plate 2a of the paper feeder 2, and the other end of the support member 8 has a One end of a biasing means 9, such as a tension spring, is engaged. The other end of the biasing means 9 is attached to the tip of the swing lever 10 via an adjustment bolt 11. Swing lever 1
0, the base end is connected to the side plate 2 of the paper feeder 2 by the pin 12.
It is rotatably attached to the upper part of a. Further, a roll 13 is rotated approximately in the middle of the swing lever 10. The roll 13 is adapted to roll on a guide rail 14 installed on the frame 1a of the main body 1 when the paper feeder 2 is inserted or removed. When the paper feeding device 2 is loaded in a predetermined position on the main body 1, the guide rail 14 is pressed by the urging force of the urging means 9 attached to the tip of the swinging lever 10 with the swinging lever 10 in a substantially horizontal position. Roll 6 to fixing roll 5
The paper feeding device 2 ejection port side of the guide rail 14 is inclined so as to be lowered one by one, and by pulling out the paper feeding device 2 from the main body 1, the swing lever 10 rotates to the position indicated by the imaginary line in FIG. 2, thereby separating the pressure roll 6 from the fixing roll 5.

Note that the pressure force of the pressure roll 6 is determined by adjusting the adjustment bolt 11.
It can be adjusted arbitrarily by rotating. Further, in the above embodiment, the guide rail 14 is inclined linearly, but it may of course be formed into a curved line.

Effects of the Invention Since the present invention has been described in detail above, when a paper jam or the like occurs, when the paper feeder 2 is pulled out from the main body 1, the roll 13 provided on the swing lever 10 moves the inclination of the guide rail 14. As you go down, swing lever 1
0 rotates downward to separate the pressure roll 6 from the fixing roll 5, so that jammed paper can be easily removed from between the fixing roll 5 and the pressure roll 6. become. After removing the jammed paper, reconnect the paper feeder 2 to the main unit 1.
By pushing it in, the tip of the swinging lever 10 is rotated upward by the guide rail 14, and the pressure roll 6 is automatically pressed against the fixing roll 5 by the biasing means 9, so there is no troublesome operation. It can be returned to working condition without the need for

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being an explanatory view of the operation. 1 is a copying machine body, 2 is a paper feeding device, 5 is a fixing roll, 6 is a pressure roll, 9 is a biasing means, 10 is a swing lever, 13 is a roll, and 14 is a guide rail.

Claims (1)

[Claims] 1. A fixing roll 5 and a pressure roll 6 which is pressed against the fixing roll 5 by a biasing means 9 are provided on the upper part of a paper feeding device 2 which can be taken in and out of the copying machine main body 1, and the biasing means 9 is , one end is locked to the tip of a swinging lever 10 whose base end is pivotally supported on the paper feeder 2, and a roll 13 provided on the swinging lever 10,
A fixing device for an electronic copying machine in which the back of a main body 1 is high and the entrance/exit side of a paper feed device 2 is in contact with a guide rail 14 that is low and inclined so as to be able to roll.