JPH051940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION -Field of Industrial Application- The present invention relates to a paper passing device used in, for example, an electrophotographic copying machine.

-Prior Art- As is well known, in a recording apparatus such as an electrophotographic copying machine, in order to easily remove recording paper that has become "jammed" inside the machine, a device is installed facing the image carrier drum. A support frame that can be tilted with respect to the machine frame is installed, and the support frame with the transfer electrode and conveyor belt assembled is
A structure that tilts when an occurrence occurs is known.
In other words, the conventional support frame is made by bending a metal plate so that the base shaft is pivotally supported with respect to the machine frame, and the upper surface of the support frame is used to transfer the toner image on the circumferential surface of the image bearing drum onto the surface of the recording paper. A transfer electrode for transferring the image and a conveyor belt for conveying the recording paper toward the fixing device are assembled.

Therefore, in conventional paper passing devices with such a structure, the support frame is bent from a metal plate, and the transfer electrode support members, conveyor belt rollers, etc. are manually assembled to the support frame. , manufacturing costs are relatively high, and it is difficult to expect cost reduction through mass production. The output lead wire of the high voltage generator is connected to the transfer electrode, but since the support frame is a good conductor, it is difficult to assemble the high voltage generator to the support frame due to its withstand voltage. There are problems with the voltage resistance and lifespan of the output lead wire that connects the high voltage generator located in the fixed part of the device and the transfer electrode.

-Object of the Invention- In view of the problems of the conventional paper passing device as described above, the present invention has a low manufacturing cost, is suitable for mass production, and provides a direct connection between a high voltage generator and a transfer electrode. The purpose of the present invention is to obtain a paper passing device having a structure that allows

-Structure of the Invention- In order to achieve this object, the present invention includes a support frame rotatably provided facing the image bearing drum, and a transfer electrode and a conveyance means such as a conveyance belt are attached to the support frame. In a paper passing device such as a copying machine to be assembled, a "U"-shaped cross-sectional groove part is formed on the upper surface of the support frame molded from electrically insulating resin, to which the transfer electrode can be slidably attached from the end. , a high voltage generator is assembled directly under the groove with the end connector facing the groove end of the support frame, and a connector at the rear end of the transfer electrode that can connect with the end connector is connected in the sliding direction of the transfer electrode. The present invention proposes a paper passing device for a copying machine or the like that has a protrusion.

-Embodiments- Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an image bearing drum 1 according to the present invention;
The interrelationship between a recording sheet 2 and a paper passing device, generally designated by the reference numeral 3, is shown, and the paper passing device 3 is provided with a support frame 4 made of an electrically insulating synthetic resin material by injection molding. That is, the support frame 4 is attached to the body frame 6 so as to be tiltable about a support shaft 5 at the base end which also serves as a drive shaft, and the body frame 6 is attached to the body frame 6 by the roller 8 of the manual operation lever 7 which receives the lower surface of the intermediate portion. The state shown by the solid line in FIG. 1 is then maintained. Then, the support frame 4 has the recording paper 2 "jam" inside the machine.
When the state is reached, the manual operation lever 7 is moved to the position shown by the imaginary line in FIG. This allows the recording paper 2 that has become "jammed" to be removed.

Further, as shown in the second figure, a plurality of paper feed section guide plates 10 aligned in the width direction of the recording paper path 9 are integrally molded on the top surface of the distal end of the support frame 4.
is guided into the recording paper path 9 by the guide plates 10 of the paper feed section. On the rear side of the paper feed section guide plate 10, a "U"-shaped cross-sectional groove part 13 is integrally formed, into which a separation electrode 11 and a transfer electrode 12 of a copying machine can be attached. The "U"-shaped cross-sectional groove portion 13 includes a transfer electrode 12 for transferring the toner image on the circumferential surface of the image carrier drum 1 onto the recording paper 2 and a separation electrode for separating the recording paper 2 to which the toner image has been transferred from the image carrier drum 1. 11, and it is possible to slidably attach the transfer electrode 12 and the separation electrode 11 from a direction perpendicular to the paper surface of FIG.

Immediately below the “U” shaped cross-sectional groove portion 13 is a symbol 1.
A high voltage generator, shown in its entirety in 4, is installed,
The wall of the U”-shaped cross-sectional groove portion 13 and the paper feed section guide plate 1
Electrical insulation between the separation electrode 11 and the transfer electrode 12 and the high voltage generator 14 is achieved by the lower partition wall 15 of 0.0. The rear end portion 12A of the integrated separation electrode 11 and transfer electrode 12 is connected to the third
A “key” shaped connector plug 16 as shown
A, 16B are supported, and when the separation electrode 11 and transfer electrode 12 are completely inserted into the "U" shaped cross-sectional groove 13, these connector plugs 16A, 16B
is the shaft cylinder 17A, 1 of the side wall 4a of the support frame 4.
It is connected to the connectors 18A and 18B of the high voltage generator 14 exposed from 7B.

A plurality of guide ribs 19A, 19B are formed on the copying machine body on both sides of the upper surface of the support frame 4, and are aligned in the width direction of the recording paper 2 and extended in the moving direction of the recording paper 2.
A vacuum suction box 20 with an open top surface is formed between 9B and 9B. A motor 22 supporting an impeller 21 that generates vacuum pressure is located inside the vacuum suction box 20, and the vacuum suction box 20 is exhausted through an exhaust port 22 opened facing the high voltage generator 14. It is blown out into the cabin. Therefore, heat is removed from the high voltage generator 14 which generates heat by the cooling air from the exhaust port 23 of the vacuum suction box 20, and a rise in temperature is prevented.

Further, in the center of the support frame 4, a second
As shown in the figure, three endless conveyor belts 24 surround the vacuum suction box 20. These conveyor belts 24 include a drive roller 25 fixed to the support shaft 5, a pair of driven rollers 26 disposed opposite to the drive roller 25 with the vacuum suction box 20 in between,
27, and conveys the recording paper 2 toward a fixing device (not shown) by driving the drive roller 25.

Since the illustrated embodiment has the above structure,
The separation electrode 11 and transfer electrode 12, which require insulation because a high voltage is applied, and the high voltage generator 14 are completely insulated by the "U"-shaped cross-sectional groove 13, so the high voltage It is safe against voltage, and the electrical connection between the high voltage generator 14 and the transfer electrode 12 can be established by simply sliding the separation electrode 11 and the transfer electrode 12 into the "U"-shaped cross-sectional groove 13. Moreover, since the high voltage generator 14 is directly connected to the transfer electrode via the connector, the reliability of the connection of this part is high and the life is long.

- Effects of the Invention - As is clear from the above description, according to the present invention, since the support frame is molded from electrically insulating resin, it is possible to not only obtain an inexpensive sheet passing device that is easy to mass produce, but also Since the transfer electrode and high voltage generator are installed above and below through the wall of the support frame, it is possible to completely isolate the transfer electrode and the high voltage generator.
Simply insert the transfer electrode into the U”-shaped cross-sectional groove.
Since the electrical connection between the transfer electrode and the high voltage generator can be completed, there is an effect that the time-consuming connection work during maintenance management can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view taken along the line shown in FIG. 2 of the main parts of an electrophotographic copying machine according to the present invention, FIG. 2 is an overall perspective view of a paper passing device according to the present invention, and FIG. FIG. 3 is an exploded perspective view of main parts. 1... Image carrier drum, 4... Support frame,
12...Transfer electrode, 13..."U" shaped cross-sectional groove, 14...High voltage generator, 16A, 16B...
connector.

Claims (1)

[Claims] 1. In a paper passing device such as a copying machine, which is equipped with a support frame that is rotatably provided facing the image carrier drum, and in which a transfer electrode and a conveyance means such as a conveyor belt are assembled to the support frame, electrically insulating resin is used. The transfer electrode can be slidably attached from the end to the upper surface of the support frame formed by
A rear end portion of the transfer electrode is formed with a U”-shaped groove in cross section, and a high voltage generator is assembled directly under the groove with the end connector facing the groove end of the support frame, and the rear end portion of the transfer electrode is capable of meeting the end connector. 1. A paper passing device for a copying machine, etc., characterized in that a connector protrudes in the sliding direction of a transfer electrode.