JPS6049908B2 - Recording paper adsorption device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a recording paper adsorption device provided opposite to a fixing device for fixing developed recording paper in a dry development type electrostatic recording device suitable for facsimile machines and the like. It is.

In a dry development type electrostatic recording device, such as a facsimile machine, it is undesirable for the recording surface of the developed recording paper to come into contact with guides, rubber rollers, etc. provided in the conveyance path until the developed recording paper is subjected to the fixing process. If it comes into contact with these objects, problems such as blurring of the image and staining of the paper may occur.

For this reason, various methods have been proposed to allow recording paper to be conveyed with its recording surface kept in a non-contact state with the guide or the like. For example, belt conveyance, suction conveyance in which a belt is combined with a suction device that utilizes negative air pressure, suction extrusion conveyance that has only a suction device and conveys the paper by pushing it out with a roller on the front side of the developing machine, and There are suction rollers, etc. Among these, the present invention is intended to improve a recording paper suction device using a relatively inexpensive suction extrusion conveyance system.

In conventional suction devices, the suction force on the back side of the recording paper is selected appropriately depending on the stiffness of the recording paper used, and the pushing force of the rubber roller in front of the developing machine prevents the recording paper from sitting up. It is designed to run at

However, if the conventional suction device remains fixed in a fixed position, the following disadvantages occur.

That is, (a) a small amount of toner adhering to the developed recording paper falls onto the fixing device while it moves backwards through the suction device, contaminating the fixing device and deteriorating its fixing ability (b) ) A small amount of toner gets around the back side of the developed recording paper, contaminates the suction device, becomes sticky due to the heat of the fixing device, and finally the back side of the recording paper becomes glued to the suction device. Otherwise, paper jams will occur.

(C) There were drawbacks such as difficulty in removing paper in the event of a paper jam due to malfunction of the entire system.

This invention solves the above-mentioned drawbacks, such as a decrease in fixing ability due to contamination of the fixing device and paper jams in the unlikely event of a paper jam. The fixing device and suction device can be freely pivoted between the open position and the suction device, and the fixed exhaust fan and suction device for obtaining suction force are separated from each other except when the suction device is in the operating closed position. By making cleaning possible, you can prevent the deterioration of fixing ability and paper jams due to contamination, and if paper jams occur due to malfunction of the system, you can easily remove the paper, and It is an object of the present invention to provide an adsorption device in which there is no need to worry about opening and closing a relatively heavy exhaust fan together with the adsorption device, and in which the exhaust fan can be installed at any suitable position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, drawings showing embodiments of the present invention will be described. In Figures 1 to 3, rollers 1 and 2 for running are shown.
A developing device 3 is provided between them, and includes a magnetic brush 33 on the recording surface side of the recording paper 9 and a back guide plate 32 on the back side.

A recording paper adsorption device 4 that adsorbs the back side of the recording paper 9 is provided downstream of the developing machine 3, and a fixing device 5 is arranged facing the adsorption device 4 on the recording surface side of the recording paper. . As shown in FIG. 2, the suction device 4 has an arm 6 rotatably attached to a fulcrum 62 provided on the side plate, and faces the fixing device 5. It is mounted so as to be able to pivot between a closed position in which the recording paper 9 is attracted to the recording paper 9 and an open position in which it is inactive and located outside the recording paper conveyance path. Therefore, the suction device 4 includes a handle 41 for opening and closing it, and . By coming into contact with the developing machine 3,
The suction device 4 has a stopper 42 that acts as a means for stopping the suction device 4 at a predetermined closed position in the conveying path of the recording paper. The suction device 4 further includes a holding means consisting of an elongated hole 61 provided in the arm, and a pin 7, which is located on the side plate and engages with the elongated notch 61 when the suction device 4 is opened. The suction device in the open position is held so as not to fall to the open position. Therefore, as can be seen in the above embodiments, the suction device 4 can be easily opened and closed by operating the handle 41, and the suction device is in the closed position when the elongated hole 61 of the arm 6 engages with the pin 7. Since they are prevented from falling, the suction device 4 and fixing device 5 can be cleaned easily, and
In the event of a paper jam, the paper can be easily removed.

Thus, since the adsorption device is pivotable between an operative closed position and an inoperative open position, the invention provides that the adsorption device is “connected” to the exhaust fan only in the closed position; In the open position, it is separated from the exhaust fan.

FIG. 3 shows an embodiment of the configuration of the air flow path between the separable exhaust fan device 8 and the suction device 4 according to the present invention, and the exhaust fan 81 has a holder 84 on the side plate of the device (not shown). It is attached through. Exhaust fan 81
A duct 82 is provided in the upper part of the duct 82, and the side end of the duct 82 facing the suction device 4 serves as an air suction port 85 covered with a backing 83 made of an elastic material such as rubber. The exhaust fan 81 takes in air from this air suction port 85 and exhausts it to the outside of the device. On the other hand, the suction device 4 has a structure in which the entire chamber forms a chamber as shown in the figure, and has an air discharge port 44 at the side end facing the duct 82.

Note that the suction surface 43 of the suction device 4 facing the recording paper 9 is
The nozzle surface has many small holes. Because of this structure, only when the handle 41 is operated to bring the suction device 4 to the closed position as shown in FIG. As shown in FIG. 2, an air flow path from the adsorption device to the exhaust fan 91 is formed in alignment with and in communication with the air suction port 85 of the exhaust fan 81, and negative pressure is generated within the adsorption device 4 due to the action of the exhaust fan 81. The recording paper 9 will be suctioned by the suction device 4.
4 to 7 show several embodiments of the connection portion of the air flow path between the adsorption device 4 and the exhaust fan 81. In FIG. ,
The air outlet 44 of the suction device 4 is formed obliquely so that the suction device 4 can be opened and closed smoothly.

FIG. 5 shows an embodiment in which the backing 83 is omitted from the duct 82.

FIG. 6 shows an embodiment in which the connection portion between the duct 82 and the suction device is formed at right angles.

FIG. 7 shows an embodiment in which bellows 101 are provided in the duct 82 and the adsorption device 4, respectively, and these bellows 101 are closed and sealed by negative air pressure.

FIG. 8 shows the air suction port 8 of the duct 82 when the suction device 4 is closed to ensure the sealing of the air flow path connection part.
5 shows a guide 111 for the suction device 4 for moving the suction device 4 a short distance in the direction of the arrow 102 to bring the air outlet 44 into contact with the air suction port 85.

This guide 111 is provided in the developing machine 3, for example. As described above, in this invention, by configuring the suction device 4 and the exhaust fan device 8 to be separable, the suction device 4 to which the exhaust fan device 8 is attached, including the relatively heavy exhaust fan 81, can be opened and closed. Furthermore, since the exhaust fan 81 can be installed at any convenient position in the apparatus, air whose temperature has increased due to the influence of the fixing device 5, etc. can be quickly exhausted from the apparatus. effective.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing an embodiment of the suction device according to the present invention together with related members, with the suction device in a closed state;
Fig. 2 is a cross-sectional view of the part shown in Fig. 1 with the adsorption device open, Fig. 3 is a perspective view showing the configuration of the air flow path including the exhaust fan with the adsorption device closed, and Figs. FIG. 7 is a partial cross-sectional view showing an embodiment of the connecting portion of the air flow path, and FIG. 8 is a perspective view showing an embodiment of the sealing guide of the connecting portion. 1, 2... Traveling roller, 3... Developing machine, 4... Adsorption device! Placement, 5... Fixing device, 6... Arm, 7...
Zen, 8... Exhaust fan device, 42... Stopper,
44...Air discharge port, 61...Elongated hole, 81...Exhaust fan, 82...Duct, 85...Air suction port.

Claims (1)

[Claims] 1. A suction device installed in the conveyance path of the developed recording paper discharged from the developing machine to suck the back side of the recording paper using negative air pressure from an exhaust fan. a device pivotally supported between an operating closed position facing a fixing device that thermally melts and fixes the toner electrostatically attracted to the fixing device and an open position located outside the conveyance path and inactive; A recording paper suction device comprising: a holding device that engages with an arm of the suction device to hold the suction device in the open position; and a stop device that stops the prepack suction device in a closed position facing the fixing device. A recorder characterized in that the exhaust fan and the suction device are separated from each other in the open position where the exhaust fan is inactive, and the exhaust fan is in the closed position and has an outlet that communicates with the air inlet of the fixed exhaust fan. Paper adsorption device.