JP2501408Y2 - Paper ejection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a paper discharge structure in a copying machine or the like.

(Prior Art) In general, a paper discharge structure of a copying machine or the like is composed of a pair of paper discharge rollers that are in pressure contact with each other, and both paper rollers are driven to rotate in synchronization with each other by driving one paper discharge roller. The structure is such that the paper is carried out to the outside.

By the way, in a copying machine or the like, the discharge roller may be driven by a drive source of a heat roller disposed above the fixing device. May be located in.

Also, regarding the paper ejection rollers arranged on the lower side (hereinafter referred to as paper ejection rollers in order to distinguish from the upper paper ejection rollers),
If the shaft is extended by the shaft extending in the width direction of the copying machine like the paper discharge roller, the whole structure becomes expensive, and it becomes difficult to adjust the pressure contact force between each paper discharge roller and the paper discharge roller. As shown in FIG. 5, each discharge roller 101 is supported on the main body side via a separate support plate (leaf spring) 102, and the discharge roller 101 is pressed against the discharge roller 103 by this support plate 102. Structures may be used. Further, in this case, the paper discharge roller 101 generally has a shape larger than that of the support plate 102 and is supported with the peripheral surface thereof being exposed to the paper discharge side.

By the way, in the case of such a discharge structure, the discharge roller 10
In order to steadily stock the paper 104 discharged by 3 and the discharge roller 101 in the discharge tray 105, the discharge roller 101 is
It is often provided at a position projecting to the discharge side with respect to the base end 105a of the discharge tray 105. Therefore, as shown in FIG. 4, when the stacking amount of the paper 104 on the paper discharge tray 105 increases, the rear end of the paper 104 contacts the paper discharge roller 101, which damages the rear end of the paper 104. However, there is an inconvenience that an abnormal sound is generated. Particularly in the case of a low-speed copying machine, since the distance between the discharge roller 101 and the discharge tray 105 is set to be relatively small, the above inconvenience is likely to occur more frequently.

As a means for solving such an inconvenience, for example, the one shown in JP-A-59-203053 can be mentioned. In this structure, the paper ejection roller 101 in FIG. 5 is omitted, and instead of the paper ejection roller 101, a paper ejection guide plate having a plurality of ridges is provided below the paper ejection roller.
According to this structure, the sheets stacked on the sheet discharge tray 105 are pressed by the discharge side end of the sheet discharge guide plate, and the above problems do not occur.

However, in this structure, the paper ejection guide plate is always fixed, and the paper is ejected while being rubbed by the ridges of the paper ejection guide plate, which is not so preferable for the paper to be ejected. I can't say. Further, since it is necessary to carry out the paper by rotating only one roller, the paper is discharged by the paper discharge roller 101 and the paper discharge roller 103 which are in pressure contact with each other as shown in FIG. It is desirable to do.

Further, in the structure including the paper discharge roller 101 and the paper discharge roller 103, a new one corresponding to the above-mentioned paper discharge guide plate is additionally provided, and when the discharged paper is pressed from above, The whole structure becomes complicated, and there is a drawback that the cost becomes high.

(Object of the Invention) In view of the above circumstances, the present invention has a discharge roller and a discharge roller that are in pressure contact with each other, and has a simple structure, and the trailing edge of the paper stocked in the discharge tray is the discharge paper. An object of the present invention is to provide a paper discharge structure capable of preventing contact with rollers.

(Structure of the Invention) The present invention includes a paper discharge roller which is arranged substantially above a paper discharge tray and is driven in the paper discharge direction, and a plurality of paper discharge rollers arranged below the paper discharge roller. A pair of supporting members for individually supporting and rotatably supporting the respective discharge rollers and pressing the lower surface of the discharge roller to each supporting member, and a pair of supporting members for supporting both ends of the rotation shaft of the discharge rollers. In the paper discharge structure provided with the side plate, the shape of the side plate of the support member is set so that at least the peripheral surface of the side plate facing the discharge tray protrudes outward in the radial direction from the peripheral surface of the discharge roller. The protruding portion of the lever serves as a paper trailing edge regulating portion.

In such a configuration, even if the paper is sequentially stocked in the paper discharge tray, the paper is blocked by the paper trailing edge regulating portion on the side wall of the supporting member that projects outward in the radial direction from the outer circumference of the paper discharge roller, and the paper is discharged. There is no direct contact with the rollers.

(Example) The Example of this invention is described based on drawing.

FIG. 1 shows the structure of the discharge part of the electrophotographic copying machine. In FIG. 1, reference numeral 1 denotes a fixing device for fixing the transferred image on the paper, and the fixing device 1 is composed of a heat roller 2 and a pressure roller 3. A discharge roller 4 and a discharge roller 5 that are in pressure contact with each other are arranged on the downstream side of the fixing device 1 in the sheet conveying direction, and a discharge tray 6 is provided on the downstream side.

As shown in FIG. 2, a plurality of paper discharge rollers 4 and paper discharge rollers 5 are provided in the width direction of the copying machine main body. Each paper discharge roller 4 is supported by the same shaft 7 extending in the width direction, and is rotationally driven together with this shaft 7 in the paper discharge direction.

As shown in FIG. 3, each paper discharge roller 5 is individually supported by a support plate (support member) 8 attached to the main body of the copying machine. The support plate 8 has a plate spring portion 8a attached to a horizontal plate 9 in the main body of the copying machine, and a side plate 8b formed at an end of the plate spring portion 8a.
The paper ejection roller 5 is rotatably supported about the shaft 5a, and the paper ejection roller 5 is pressed against the lower surface of the paper ejection roller 4 by the elastic force of the leaf spring portion 8a. As a result, the paper discharge roller 5 is mounted substantially above the base end 6a of the paper discharge tray 6 at a position projecting to the discharge side from the base end 6a, and is driven to rotate by the paper discharge roller 4. ing. 1 and 2, reference numeral 10 is a guide plate for guiding the sheet discharged from the fixing device 1 to the discharge side.

In the present embodiment, the paper ejection roller 5 has protrusions (knurls) 5b formed at two locations on its peripheral surface. By ejecting the rear end of the paper by the protrusions 5b during ejection, It is configured so that the paper can be reliably discharged.

Further, as a feature of the present invention, as shown in FIG. 4, in the both side plates 8b of the support plate 8 which supports the discharge roller 5, the peripheral surface of the discharge side lower part is more than the peripheral surface of the discharge roller 5. Also largely protrudes in the radial direction thereof, and thereby an arc-shaped sheet trailing edge regulating portion 8c having a larger radius than the discharge roller 5 is formed. In the present invention, this paper trailing edge regulating section
The shape of 8c does not matter, but it is preferable that at least the upper end of the 8c is rounded so that the discharged paper is not caught. Further, a cover for covering the peripheral surface of the discharge roller 5 from the outside may be provided integrally with the paper trailing edge regulating portion 8c.

In the structure described above, when the paper discharge roller 4 is driven, the paper discharge roller 5 rotates together with the paper discharge roller 4,
The paper ejected from the fixing device 1 is ejected by these paper ejection rollers 4
The sheet is conveyed while being sandwiched between the sheet discharge rollers 5, and is discharged onto the sheet discharge tray 6.

Then, when such discharge is repeated and a large number of sheets are stocked on the discharge tray 6 (see the two-dot chain line in FIG. 1), the rear end of this sheet and the discharge roller 5 are in close proximity to each other. However, the trailing edge of this paper is
Since the sheet trailing edge regulating portion 8c having a larger radius than the discharging roller 5 comes into contact, the sheet trailing edge regulating portion 8c prevents direct contact with the sheet discharging roller 5.

Therefore, according to this structure, it is possible to prevent an abnormal sound from being generated or a rear end of the paper from being damaged due to the contact between the paper and the paper discharge roller 5. In particular, when the paper discharge roller 5 having the projection 5b is used as in this embodiment, when the paper discharge roller 5 and the paper come into contact with each other, the damage of the paper becomes more remarkable. It will be more effective.

Moreover, a new member or the like is not provided in order to prevent contact with a sheet, and a very simple and low-cost structure in which the shape of the side plate 8b of the existing support plate 8 is simply devised. Can be obtained.

The paper discharging structure of the present invention is not limited to a copying machine, but can be applied to a discharging unit of a device for carrying a paper such as a facsimile or a printer.

(Effect of the Invention) As described above, according to the present invention, at least the peripheral surface of the side wall of the support member of the paper discharge roller provided in advance, which faces the paper discharge tray, is projected outward in the radial direction from the outer circumference of the paper discharge roller. Since this is used as the paper trailing edge regulation unit, it is possible to prevent the paper stocked in the paper ejection tray from contacting the paper ejection rollers with a very simple structure without providing new members. It is possible to prevent the generation of abnormal noise or damage to the discharged paper as in the conventional case.

[Brief description of drawings]

FIG. 1 is a side view showing a sheet discharging section of an electrophotographic copying machine according to an embodiment of the present invention, FIG. 2 is a front view of the discharging section, and FIG. 3 is a perspective view of a supporting plate of the discharging section. FIG. 4 is a side view showing a main part of the discharging section, and FIG. 5 is a side view showing a conventional sheet discharging structure. 4 ... Paper discharging roller, 5 ... Paper discharging roller, 5a ... Shaft (rotating shaft of paper discharging roller), 5b ... Projection, 6 ... Paper discharging tray, 8 ...
Support plate (support member), 8b ... side plate, 8c ... paper trailing edge regulating section.

Claims (2)

(57) [Scope of utility model registration request] 1. A paper ejection roller which is disposed substantially above a paper ejection tray and is driven in the paper ejection direction, a plurality of paper ejection rollers disposed below the paper ejection roller, and each paper ejection roller. And a pair of side plates that support both ends of the rotation shaft of the paper discharge roller are provided on each support member. In the paper discharge structure, the side plate of the support member is formed in such a shape that at least the peripheral surface of the side plate facing the discharge tray protrudes outward in the radial direction from the peripheral surface of the discharge roller. A paper discharge structure characterized in that the rear end of the paper is regulated. 2. The paper discharge structure according to claim 1, wherein a projection for pushing the rear end of the paper in the discharge direction is formed on the peripheral surface of the paper discharge roller.