JPH0470825A - Paper separation device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION - The above invention relates to a paper separating device installed in a diazo copying machine or the like, which separates an original from a photosensitive paper using negative pressure.

Conventionally, as a sheet separating device of this type, there is known, for example, the one disclosed in Japanese Unexamined Utility Model Publication No. 5730739 proposed by the present applicant.

However, in this device, a plurality of conveyor belts are rotatably wound between the suction holes on the outer periphery of the document suction duct, and when the document is separated, the document 22a is sent by the conveyor belts as shown in FIGS. , the conveyor belt 6a, and the outer circumferential surface of the document suction duct 1a where the suction hole 3a is located, a gap 25a is formed between the document suction duct 1a and the suction hole 3a. There were problems such as not being able to obtain enough force and not being able to separate properly.

Therefore, this invention solves the conventional problems as described above, prevents leakage of suction negative pressure, and obtains high suction negative pressure.
It is an object of the present invention to provide a paper separation device that can improve separation performance.

In order to achieve the above object, the paper separating device of the present invention includes:
A weir having approximately the same height as the conveyance belt is provided on the outer peripheral surface of the document suction duct between the conveyance belts at a position on the upstream side of the suction hole in the conveyance direction.

In this case, it is preferable that the surface of the weir facing the suction hole be a concave arcuate surface.

Stop - 1 By providing the above-mentioned weir, the gap formed between the document, the conveyor belt, and the outer circumferential surface of the document suction duct with suction holes is filled, and the generated negative suction pressure is prevented from leaking. is prevented, and higher suction power can be obtained.

Therefore, in printing, when the superimposed original and photosensitive paper sent out after exposure are fed near the entrance of the separating section, the original is conveyed through the conveyor belt and the weir, which are at almost the same height, in close contact with them. As soon as it crosses the weir, it is sucked in by the high suction force without any leakage, and is reliably separated.

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of the document suction duct.

In both figures, 1 is a document suction duct, 2 is a photosensitive paper suction duct, and their opposing surfaces are curved.
They are arranged facing each other at a predetermined interval. Both ducts 1,
A plurality of suction holes 3 and 4 are formed in the longitudinal direction on opposing surfaces of the two, and the vicinity of both holes 3 and 4 serves as a separation section 5. A plurality of endless document conveyance belts 6 are provided on the outer periphery of the document suction duct 1 in the length direction of the duct 1, on a surface facing the photosensitive paper suction duct 2, and on a guide plate 7 that extends vertically in a curved manner integrally with the document suction duct 1. Drive rollers 8 that are in sliding contact and each supported by a shaft
and is rotatably wound around the driven roller 9.

On the outer circumferential surface of the document suction duct 1 between the transport belts 6, at a position on the upstream side of the suction hole 3 in the transport direction, there is a rectangular shape having approximately the same height as the transport belt 6, as shown in an enlarged view in FIG. 3.4. A weir 11 is provided. When providing the weir 11, the weir 11 may be manufactured separately and then fixed to the outer peripheral surface of the duct 1, or it may be manufactured integrally with the duct 1.

13 is a guide plate 14 extending below the photosensitive paper suction duct 2
Apertures 15 formed opposite to the conveyor belt 6 are feed rollers that are rotatably provided to press from the apertures 13 toward the conveyor belt 6. The rollers 15 are made of an elastically deformable material. 6 shows another modification of the weir, and the weir I7 in FIG. 5 has a surface facing the suction hole 3 formed into a concave arcuate surface 18. The weir 19 shown in FIG. 6 is further formed into a circular arc ridge.

When the surfaces of the weirs 17 and 19 facing the suction hole 3 are made into concave arcuate surfaces in this way, it becomes easier to guide the document to the outer peripheral surface of the document suction duct 1 where the suction hole 3 is located.

FIG. 7 shows a state in which the leading edge of the document 22, which overlaps the photosensitive paper 21 and is sent out, is supplied to the vicinity of the entrance of the separating section 5 and is being conveyed. In this state, the document 22 is conveyed so as to be in close contact with the conveyor belt 6 and the weir 11, which are at approximately the same height. Therefore, as shown in Fig. 3.4, there is no leakage of suction negative pressure from the gap 25a as in the conventional case shown in Fig. 8.9, and the document 22 crosses the weir 11 as indicated by arrow B. It is suctioned with high suction power without leaking, and separation is ensured.

The various types of weirs 11, 17, and 19 shown above are merely examples, and other design examples are not excluded.

The invention of claim 1 has the above-mentioned weir, which makes it possible to suction the document with high suction force and reliably separate it, thereby improving the separation performance. can. Moreover, it can be easily manufactured by making simple improvements to the conventional one. In addition to the above-mentioned effects, the invention of claim 2 further provides that the surface of the weir facing the larger suction side is a concave arcuate surface, thereby making it easier to guide the original to the outer peripheral surface of the original suction duct having the suction hole. Therefore, the separation performance is further improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing one embodiment of the present invention, Fig. 2 is a perspective view looking at the document suction duct side, Fig. 3 is a front view of the main part, and Fig. 4 is a - - - - of Fig. 3. 5 and 6 are front views corresponding to FIG. 3 showing a modified example of the weir, FIG. 7 is a perspective view for explaining the operation, and FIG. 8 is a conventional example. Front view corresponding to Figure 3, Figure 9 is the same as ■ in Figure 8.
It is a cross-sectional view along line ~■. 3.4...Suction hole/separation part 6...Transport heald +1, 17.19...Weir 18...Circular surface 2I...Photosensitive paper 22 Manuscript Hinininito Co., Ltd....Document suction duct 2...Photosensitive Paper suction duct Atsushi 1
Same Atsushi 3 Figure O 4 No Atsushi 5 Figure Atsushi 6 Ward

Claims (1)

[Claims] 1. A pair of document suction ducts and photosensitive paper suction ducts each having a plurality of suction holes on opposing surfaces, each rotatable between the suction holes and the suction holes on the outer periphery of the document suction duct. and a negative pressure generating means connected to the openings of the two ducts, the superimposed original and photosensitive paper sent after printing exposure to the separating section between the two ducts. In a paper separation device such as a diazo copying machine, which feeds documents and separates them by negative pressure of air generated near the suction holes of both the ducts, the paper is separated by the outer circumferential surface of the document suction duct between the conveyor belts and the document is conveyed through the suction holes. A paper separation auxiliary device characterized in that a weir is provided at a position on the upstream side in the direction and has a height substantially the same as that of the conveyor belt. 2. The paper separating device according to claim 1, wherein the surface of the weir facing the suction hole is a concave arc surface.