JPH04333449A - Sheet conveyance guide plate - Google Patents

Abstract

PURPOSE:To prevent the jamming which occurs in a sheet which is being conveyed in the notch section of a sheet conveyance device. CONSTITUTION:In a downstream position of the notch section 3 of a sheet conveyance guide plate 1, a throttle 5 is formed in such a way that a corner section 3a is separated from a sheet guide face 1a and is further separated with getting near the central section 3b of the notch section 3. Therefore, the sheet P which is conveyed is not caught by the corner section 3a. Even if the center section of the sheet P swells out, since the center section 3b is further separated from the corner 3a, the sheet P which is being conveyed also is not caught near the central section 3b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveyance guide plate for recording in printing machines, copying machines, etc., and more particularly to an aperture structure in a cutout portion of the sheet conveyance guide plate.

0002

2. Description of the Related Art Conventional sheet conveying surfaces have rectangular cutouts because rollers and the like for conveying sheets need to protrude.

[0003] As a conventional example, Utility Model Publication No. 54-3437
There is a device as shown in FIG. 5 described in Japanese Patent No. 9, another example as shown in FIG. 6, and still another example as shown in FIG.

0004

However, in the conventional example shown in FIG. 5, the downstream side of the sheet in the conveying direction is notched at an angle θ to the conveying direction, and the upstream side is notched at right angles to the conveying direction. A notch a is formed to allow the roller d to be seen. The angle θ is set to 30 degrees or less. Furthermore, since the corner b must be circular with the smallest possible radius, it is difficult to punch out, and burrs and burrs are likely to remain, resulting in jamming. Furthermore, if the width e1 of the notch a becomes large, the distance j between the terminal end of the parallel portion of the notch a and the downstream end of the guide c must be increased, resulting in a drawback that the strength of the guide c is insufficient.

In the conventional example shown in FIG. 6, an aperture f is formed on the downstream side of the notch a, but it is difficult to accurately align the joint g between the aperture f and the parallel portion of the notch a. It is difficult and tends to produce burrs and burrs, which has the disadvantage of causing jams.

Furthermore, in the conventional example shown in FIG. 7, a portion i corresponding to the seam g shown in FIG.
Since it is further away from the guide surface of guide c, it has the advantage that even if there is a slight burr or burr, it will not get caught on the conveyed sheet, but when the width e2 of notch a is large as shown, the sheet being conveyed There is a drawback that the closer P gets to the middle of notch a, the more it bends and is more likely to get caught in the aperture h and cause a jam.

[0007] Accordingly, the present invention has been proposed by forming an aperture so that the corners of the notch of the sheet conveyance guide are separated from the sheet conveyance surface at least on the downstream side, and the distance further increases toward the center. It is an object of the present invention to provide a sheet conveyance guide plate that can convey sheets smoothly and prevent jams.

[0008]

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIG. 1, a sheet conveying guide plate (1) having a notch (3)
The aperture (5) is arranged so that the corner (3a) is separated from the sheet guide surface (1a) at least on the downstream side of the notch (3), and the distance further increases toward the center (3b). ).

[0009]

[Function] Based on the above configuration, the sheet (P) has a notch (
3) is guided by the sheet conveyance guide plate (1). At this time, the sheet (P) has a corner (3a) separated from the sheet guide surface (1a) at least at the downstream side of the notch (3), and a center part (
3b) is conveyed along the increasing downstream side.

[0010] The reference numerals in parentheses are used to refer to the drawings and do not limit the structure in any way.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a sheet conveyance guide plate, and a sheet conveyance plate 2 is fixed in parallel to the sheet conveyance guide plate 1 with a gap therebetween. and,
A rectangular notch 3 is provided in the sheet conveyance guide plate 1, and the sheet P is conveyed in the direction of arrow A into the gap. Then, mark the arrow A on the sheet conveyance guide plate 1.
A substantially rectangular notch 3 is provided parallel to the ridge line, and a corner 3a of this notch 3 on the downstream side in the direction of arrow A, which is the sheet conveyance direction, is the top of the ridgeline, and furthermore, the central part 3 of the downstream side
The aperture 5, which forms part of the pyramid, is formed such that b is at the top of the ridgeline which is farther away from the sheet guide surface 1a than the corner 3a.

Conveyance rollers 6, 6 are integrally connected and attached by a shaft 6a approximately in the center of this notch 3, and these conveyance rollers 6, 6 move the sheet P onto the sheet conveyance plate 2.
It is designed to transport.

Based on the above configuration, the sheet P is conveyed on the sheet conveying plate 2 by the conveying roller 6, and the sheet P is conveyed through the notch portion 3.
When passing under the sheet guide surface 1a, the corner 3a
Since it is separated from the sheet P, even if there is a slight burr or burr remaining, it will not get caught on the sheet P. Furthermore, even if the sheet P swells up when passing through the center portion 3b, the distance from the corner portion 3a of the center portion 3b increases toward the center portion 3b. It doesn't get caught.

Therefore, the sheet P is smoothly conveyed on the sheet conveying plate 2, and jamming of the sheet P can be prevented. Further, since the aperture 5 is formed in a pyramid shape, processing becomes easy.

As shown in FIG. 2, the case is shown in which the distance B from the downstream side of the notch 5 to the downstream end of the sheet conveying plate 1 is short, but if it is long, the pyramid-shaped aperture 5 Let C and D be the distances in the sheet conveyance direction from the apex of the sheet to the corner of each bottom, the distances C and D can be made long and the drawing process becomes easy.

Next, another embodiment will be described with reference to FIG.

The aperture on the downstream side of the notch 7 is formed into a spherical or conical shape.

[0019] By doing so, the drawing process becomes easier, and jams and the like can be prevented as in the previous embodiment.

Next, still another embodiment will be described with reference to FIG.

When the distance E between the downstream side of the notch 9 and the downstream end of the sheet conveyance guide plate 1 is short, the aperture on the downstream side of the notch 9 is formed in the shape of a rugby ball.

[0022] The effects are similar to those of the previous embodiment and other embodiments.

[0023]

[Effects of the Invention] As explained above, according to the present invention,
The corner on the downstream side of the notch of the sheet conveyance guide plate is separated from the sheet guide surface, and the aperture is formed so that the distance further increases toward the center, so that the sheet is conveyed through the notch. Since it does not get caught on the sheet, jamming of the sheet being conveyed can be prevented. Further, the workability of the drawing is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a sheet conveyance guide plate showing an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a plan view showing another embodiment.

FIG. 4 is a plan view showing still another embodiment.

FIG. 5 is a perspective view of a conventional sheet conveyance guide plate.

FIG. 6 is a perspective view of another conventional sheet conveyance guide plate.

FIG. 7 is a perspective view of yet another conventional sheet conveyance guide plate.

[Explanation of symbols]

1 Sheet conveyance guide plate 1a
Sheet conveyance guide surface 3 Notch portion 3a Corner portion 3b Center portion 5 Aperture P Sheet

Claims (1)

[Claims] 1. A sheet conveyance guide plate having a notch, the corner being spaced apart from the sheet guide surface at least on the downstream side of the notch, and apertured so that the distance further increases toward the center. A sheet conveyance guide plate characterized in that: