JPS61141461A - Double-face copying device - Google Patents

Abstract

PURPOSE:To prevent the dew condensation on a guide plate by attaching an air collecting body to an air discharge port of a cooling fan and introducing part of the exhaust air collected by the air collecting body into a route for passing for paper. CONSTITUTION:The installed cooling fan 129 for preventing the heating in a body 20 is communicated via a duct 22 to an exhaust air port 21 provided to the side wall. The air collecting body 23 detained to the partition frame of the port 21 for the purpose of taking out part of the exhaust air from the exhaust air port 21 is communicated with an aperture 25 provided in the position facing on outside cover body 24 covering a down stream roller 12 side. The exhaust air fed to the aperture 25 of the body 24 by the body 23 by blown atop the guide plate [guide plate of the paper discharge route (a)] 15 covering the top surface of a movable branch body 13 and a through-hole 26 for allowing the passage of such exhaust air is provided atop the plate 15. The exhaust air is therefore passed through the hole 26 and is blown to the guide plates 16, 17 in the introducing route (b) and the route (c) for discharging the turned over paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double-sided copying apparatus, and more particularly to a double-sided copying apparatus that can effectively prevent dew condensation jams occurring in a paper path.

[Conventional technology]

In general, in a duplex copying device, the paper that has been copied on one side in the copying section is changed direction, conveyed to the lower part of the copying section, partially accommodated in the stunker, and the paper is sent out again, conveyed upward, and then changed direction and transported to the copying section. supply.

Since the paper is designed to copy the other side, the direction of the paper is changed twice between copying one side and copying the other side.
The paper must be reversed once during its path. In addition to the above-mentioned functions, the nine-sided duplex copying apparatus also needs to have the function of directly ejecting the paper after one-sided copying from the machine, or of inverting and ejecting the paper to align the pages.

Conventionally, a plurality of paper passing paths that can be arbitrarily switched to the paper discharge section have been created. The multiple paper passing paths created in this paper ejection section are easily affected by temperature differences between the inside and outside of the machine, and if these paths are formed using guide plates, condensation may occur due to temperature differences, leading to paper jams. This caused the occurrence of Conventionally, to prevent this condensation, a wire-like round bar was used instead of the guide plate, or when a guide plate was used, a fan was installed near the guide plate to remove high-humidity air to prevent wind from passing through the paper path. The methods used were to send heat to the guide plate or to provide a heater to heat the area around the guide plate.

However, when making a paper guide with a round bar, the cost is higher than when making a guide with a flat plate, and there are disadvantages such as deformation of the round bar, and it is not recommended to add a fan or heater near the guide plate. The installation space required increased equipment size and increased costs.

[Purpose of the invention]

In view of the above-mentioned points, it is an object of the present invention to provide a double-sided copying device that can prevent dew condensation on a guide plate by removing a part of the exhaust air from an existing cooling fan installed in the main body of the copying device by a simple means. The purpose is

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention attaches an air collector to the exhaust port of the cooling fan provided on the side wall of the main body of the copying device in the paper passing path provided on the downstream side of the fixing unit, and exhausts the air taken by the air collector. The structure is such that a part of the paper can be introduced into the paper passing path.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

FIG. 1 shows a sectional view of a double-sided copying apparatus to which the present invention is applied. In FIG.
2 is a document platen (
(not shown) a copying unit that copies the original image placed thereon;
Reference numeral 3 denotes a fixing section that receives the paper that has been copied on one side by the copying section 2 via the conveyor belt 4 and fixes the copy side. On the downstream side of the fixing unit 3, there is a paper discharge path a for straightly advancing the paper after fixing and discharging it outside the machine, and an introduction path for introducing the paper into the double-sided copying path 5 for two-sided copying or reverse paper discharge. A route branching device 6 is provided which has a function of switching the route. At the lower part of the copying machine main body on the downstream side of the double-sided copying path 5 that continues to the path branching device 6, there is a reversing mechanism 7 for reversing the paper, a stacker portion 8 for storing the reversed sheet, and a stacker portion. A refeeding mechanism 9 for paper stored in the copying section 8 is provided, and furthermore, a relay mechanism 10 for returning the paper to the paper feeding path of the copying section 2 is provided downstream of the paper refeeding mechanism 9.
) The branching device 6 is a movable branching body 1 having an inverted triangular cross section, which is provided between an upstream roller 11 and a downstream roller 120 consisting of upper and lower rollers so as to be able to swing around an axle load 4 as a fulcrum.
3, and guide plates 15, 16, and 17 are provided facing each of the upper and side surfaces of the movable branch body 13, and a paper discharge path a that goes directly from the upstream roller 11 to the downstream roller 12, and a paper discharge path a that goes directly from the paper discharge path a. An introduction path that branches to introduce the paper into the duplex copying path 5 and a reversal paper discharge path C that conveys the paper that has entered the duplex copying path 5 in the opposite direction and guides it to the downstream rollers 11 are formed. This switching between the paper discharge path a and the introduction path S is achieved by swinging the tip 13a of the movable branch body 13 on the upstream roller side by the action of a solenoid (not shown) and displacing it up and down from the nipping point P of the rollers 11. It will be done. Also.

Selection between conveying the paper in the reverse direction to the reversing paper ejection path C and conveying the sheet from the single-sided copying path 5 to the reversing mechanism 7 is performed by forward and reverse operation of a forward/reverse roller 18 provided in the middle of the double-sided copying path 5. . During this reverse conveyance, the paper does not flow backward into the introduction path because its own restoring force acts and the distance between the lower end of the movable branch 13 and the guide plate 16 is narrowed.

In FIG. 2, reference numeral 19 denotes an existing cooling fan for preventing heating inside the main body 20 of the copying machine, and the fan 19 is connected to a duct 22 connected to an exhaust port 21 provided on the side wall of the main body 20, as shown in FIG.
communicated through. Reference numeral 23 denotes a wind collector that is engaged with the partition frame of the exhaust outlet 20 in order to take out a part of the exhaust air coming out of the exhaust outlet 20, and the air collector 23 is located at a corresponding position on the exterior body 24 that covers the downstream roller 12' side. It communicates with an opening 25 provided in the. From the air collector 23 to the opening 25 of the exterior body 24
The exhaust air sent to is blown onto the upper surface of a guide plate (guide plate for paper discharge path a) 15 that covers the upper surface of the movable branch body 13.

The upper surface of the guide plate 15 is provided with a through hole 26 through which the exhaust air passes. Therefore, the exhaust air passes through the through hole 26 and reaches the space in which the movable branch body 13 is installed.

Although this movable branch body 13 is not necessarily clearly shown in the accompanying drawings, it has a comb-teeth shape.

The discharged air passes through the comb teeth 27 and reaches the introduction path and the guide plate 16, 17 of the reversing sheet discharge path C.

〔Effect of the invention〕

As explained above, in the double-sided copying device according to the present invention, an air collector is attached to the exhaust port of the cooling fan provided on the side wall of the copying device main body in the paper passing path provided on the downstream side of the fixing unit, and The feature is that a part of the discharged air can be introduced into the paper passage path, so that part of the discharged air can be introduced into the paper discharge path formed around the movable branch at all times while the copying machine is operating.
The air is blown onto the guide plates that make up the inlet path and the reversing paper ejection path, so there is no condensation in these areas.Moreover, the air used to prevent condensation is extracted from the existing fan, which is different from the conventional method. In order to prevent condensation, we use a round bar that costs more than a guide plate,
This has the excellent effect of preventing dew condensation without using additional equipment such as a fan or heater for removing high-humidity air near the guide plate.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the entire double-sided copying apparatus of the present invention, and FIG.
The figure is an enlarged sectional view of the main part, and FIG. 3 is a perspective view of the same external appearance.

Claims (1)

[Claims] An air collector is attached to the exhaust port of a cooling fan provided on the side wall of the main body of the copying machine in the paper passage provided on the downstream side of the fixing unit, so that a part of the exhaust air taken by the air collector can be introduced into the paper passage. A double-sided copying device characterized by: