JPH0242679Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> This invention relates to a stopper for document positioning. More specifically, the present invention relates to a stopper for positioning a document in an electrostatic copying machine or the like, which can position the document in a predetermined exposure area on a document table by aligning the document.

<Background and Prior Art> Conventionally, electrostatic copying machines have been provided that are equipped with an automatic document feeder. In these copying machines, a stopper is used to stop the automatically transported document in a predetermined exposure area on the document table, and also to prevent the document from being ejected from the document table after it has been copied. What is needed is a document positioning device that allows the stopper to escape from the document ejection path.

The general structure of this document positioning device will be explained with reference to FIGS. As shown in detail in FIG. 2, a flat plate-shaped stopper 20, which forms part of the document positioning device 2, is formed opposite to each other on the end side. The stopper 20 is rotatably mounted with the contact surfaces 21 facing each other, and protrudes from the upper surface of the document table 3 by means of a spring 22 provided on the lower surface of the stopper 20, and has elasticity so that the upper end of the stopper 20 is always in contact with the conveyor belt 11. Forced. Therefore, the document A conveyed onto the document table 3 is positioned in a predetermined exposure area according to each document size, with the advancing side edge facing the stopper 20 (particularly as shown in FIGS. 3 and 3). (See Figure 4). At this time, the conveyor belt 11 is stopped driving before the document A reaches the stopper 20, and conveys the document A to the stopper 20 by its inertia.

When the original A is positioned, the optical system 40 moves to scan and expose the original A, and the copy processing section 41 performs a copy process. When the exposure is completed, the stopper 20 is moved against the biasing force of the spring 22 by a solenoid (not shown) or the like built in the automatic document feeder 1 so that its upper part is located below the top surface of the document table 3. is rotated and held so that it does not get in the way of document ejection. At the same time, the conveyor belt 11 is driven and the exposed original document A is discharged to the stacker 12 portion on the upper surface of the automatic document feeder 1.

However, in the positioning device 2, the corner ends of the document A tend to curl and are weaker than the center. This tends to cause the so-called jamming phenomenon in which the end portion of the sheet is drawn into the discharge side end surface 31 of the document mounting table 3. For this reason, there is a problem in that troubles such as document jams are likely to occur.

On the other hand, another stopper is also available in which the document contacting surface is formed in an inclined manner so that the conveyed document does not climb over the stopper (Japanese Patent Laid-Open No. 57
-Refer to Publication No. 119370). Although this stopper has the additional effect of preventing the document from being jammed to some extent, it has the problem that the edge of the document on the stopper side protrudes from above the document table, making it impossible to expose the protruding portion.

<Purpose> This invention was made in view of the above problems, and the purpose is to provide a document positioning stopper that has a simple structure, can prevent documents from getting caught, and can expose the entire area of the document. .

<Structure> The structure of this invention to achieve the above object includes a document positioning stopper which is rotatably provided opposite to the end surface of the document placing table, and the stopper has a document-facing stopper at both ends of the document placing table. It is characterized in that a notch is formed on the surface side to prevent the edge of the document from getting caught.

<Example> Next, an example of this invention will be described below with reference to the attached FIG. 5 and subsequent figures.

As is clear from FIGS. 5 and 6, the document positioning stopper 20 of this invention is different from the conventional one in that notches 23 of a predetermined length are formed on the document contacting surface 21 side at both front and rear ends. to differ greatly. This notch 23 is formed at the opposite end of the document A with the minimum width.
A' is formed so that it does not abut over a predetermined width, and in the case of the figure, it is formed at a predetermined distance from the edge position in the width direction of the document A corresponding to the A5 size document A as the minimum document. It is constructed by cutting out continuously from a point a near the center to the extreme end. By configuring such a notch 23, even when the document stopper 20 is rotated downward, both ends A' of the document A, which tend to curl and are weaker than the center portion, are prevented from coming into contact with the document stopper 20. Since they are not in contact with each other, there is no risk of the document being drawn toward the end surface 31 of the document mounting table 3. In other words, the jamming phenomenon of the document edge A' can be completely prevented.

Note that the notches 23 may be formed at predetermined intervals as shown in FIGS.
The cutout portions 23 may be configured to correspond to each end portion A′ so that the predetermined area A′ does not come into contact with the non-cutout portion 24 of the stopper 20. Especially in this case, even if the document is large, it is necessary to
4, the notch 23 can be configured to accommodate small-sized originals of A5 size or smaller. In the case of edge alignment, in which the document A is not centered but moved to one side of the document table 3, a sixth stopper is placed at the end of the stopper on that side
A continuous notch 23 as shown in the figure is formed, and the other end has notches 2 at predetermined intervals as shown in FIG.
3 may be configured.

The stopper 20 having the above structure can be used not only in a copying machine equipped with an automatic document feeder, but also in a type in which a document is manually placed on a document table and the placed document is pressed by a presser plate. It can also be applied to copying machines (see FIGS. 9 and 10).
In this case, the stopper 20 is elastically biased by the spring 22 so as to be able to rotate upward to a predetermined height, and the presser plate 32 is
It may be configured to move this up and down in conjunction with the up and down opening/closing operations. With this configuration, the stopper 20 can be made to protrude high from the top surface of the document table 3 when the presser plate 32 is open, so that it is possible to make the stopper 20 protrude high from the top surface of the document table 3. Even if this occurs, it can be accepted without any problem and positioning can be performed reliably. Even if the presser plate 32 is closed and the stopper 20 is rotated downward, the notch 23 prevents the edge of the document from being
This means that the jamming phenomenon of A′ can be prevented. Furthermore, the copying machine having the above configuration is suitable because it can be easily converted to a copying machine equipped with an automatic document feeder.

Note that the document positioning stopper of this invention can of course be applied to other image forming apparatuses such as facsimile machines and document reading apparatuses.

<Effects of the invention> According to the document positioning stopper of this invention constructed as described above, a notch is formed at a predetermined position to prevent the opposite end of the document from coming into contact with the stopper, so that the stopper is not moved downward. It is possible to prevent the inconvenience of the end portion being caught between the document mounting tables even when the document is rotated to the original position, and it is possible to perform a stable image forming operation without causing document jams or the like.

Further, since the entire document can be exposed and only the conventional stopper needs to be modified, the cost burden is small, and it is suitable as a simple and reliable measure to prevent document jamming.

[Brief explanation of the drawing]

The drawings show a conventional example and an embodiment of this invention. Fig. 1 is a schematic diagram of the conventional example, Fig. 2 is a schematic cross-sectional view, Fig. 3 is a perspective view, and Fig. 4 is a main part. 5 is a front view of the document positioning stopper of this invention, FIG. 6 is a perspective view of the same main part, FIG. 7 is a perspective view of the main part showing another embodiment, and FIG. 8 is the same as the previous figure. FIG. 9 is a perspective view showing still another embodiment, and FIG. 10 is a sectional view of a main part of the previous embodiment. 2...Document positioning device, 20...Document positioning stopper, 23...Notch, A...Document.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A document positioning stopper that is rotatably provided opposite the end surface of the document placement table, and which has a document facing surface side at both ends of the stopper. A document positioning stopper characterized by forming a notch to prevent jamming. 2. The document positioning stopper according to claim 1 of the above-mentioned utility model registration, wherein the notch portions are continuously formed for a predetermined length at both ends of the stopper. 3. The document positioning stopper according to claim 1, wherein the notches are formed at predetermined intervals at at least one end of the stopper in correspondence with the end of a standard-sized document.