JPS5859138A - Sheet conveyer - Google Patents

Abstract

PURPOSE:To prevent flection of a sheet in its width direction, in sheet conveyer for a copying machine and the like, by arranging an auxiliary conveying means moving to the width direction of the sheet in accordance with the sheet moving to the upstream side of a sheet conveying direction. CONSTITUTION:A sheet conveyer is constituted such that a conveying roll 6 is forcibly contacted to a conveying roller 5 by a spring 9, and its forward direction is diagonally provided by an offset angle theta of a fixing roller 12 with a sheet, further formed rotatable by a driving source through a gear 4, while the roll 6 is arranged movable with thrust by a prescribed distance l to a shaft 71. The sheet is held between the conveying roll 6 and the conveying roller 5, and the roll is driven and rotated till the sheet is bitten by the fixing roller 12. If the sheet goes into the fixing roller 12, its forward direction is moved to the direction of the offset angle theta and tilted then moved by the distance l to the length direction. In this way, flection of the sheet is moderated. Thus flection in the width direction of the sheet can be prevented.

Description

Detailed Description of the Invention This invention relates to a sheet conveying device for various machines (hereinafter referred to as copying machines, etc.) having a mechanism for conveying sheets, and in particular, in a copying machine, the leading edge of one sheet in the conveying direction is The present invention relates to a sheet conveying device that guides and conveys a sheet from one side to the other end side first to a conveying means.

Conventionally, in this type of sheet conveyance device, for example, in a fixing device such as a copying machine, a pair of roller fixing devices have a pair of rollers that are attached to a sheet with respect to m (hereinafter referred to as a pressure line) on which high pressure acts, in order to prevent shock and noise caused by sheet conveyance. At a certain angle in the transport direction (
θ), and the sheet is conveyed so that the leading end in the conveying direction of the sheet to be conveyed is guided from one end side first to the other end side to the conveying means. If the sheet is conveyed in this state, the sheet will be pulled in the width direction, displaced and moved forward when it passes through the fixing device (in a direction tilted at an angle of 0 with respect to the sheet conveyance direction). . At this time, if a forced conveyance roller is provided as a sheet conveyance auxiliary means on the upstream side of the fixing device in the sheet conveyance direction, the sheet will not shift in the width direction between the forced conveyance joint and the fixing device. This has the drawback of causing image disturbance due to poor transfer or contact of the image surface with other members.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a novel sheet conveying device that is improved in view of these drawbacks.

O Another object of the present invention is to provide a sheet conveying device that can convey a sheet without causing any sagging in the conveyed sheet.

Still another object of the present invention is to provide a sheet conveying device that prevents the sheet from sagging by allowing movement in accordance with the movement of the sheet in the width direction.

That is, an advantageous configuration of the present invention that can achieve the above object is a sheet conveying device that guides and conveys the leading end of the sheet in the conveying direction from one end side first to the other end side to the conveying means. 1. A sheet conveying device having a sheet conveying auxiliary means that is allowed to move in the width direction according to the sheet conveyed by the conveying means and moved in the width direction of the sheet, on the upstream side of the sheet conveying direction of the conveying means. be.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

The first diagram is a sectional view showing an embodiment of the present invention, and the second diagram is a plan view thereof. In the figure, a sheet holding an image transferred from a drum 1 is guided to a guide plate 10 by a separating rubber roller 2 and a separating roller 5, and is guided onto a lip partially provided on the guide plate 10, and is then guided by a conveying roller. 5 and conveyor rollers 6 and guided to a guide plate 11. The conveyance roller 6 is a sufficient distance from the shaft portion 71 provided at the other end of the arm 7 which rotates around the shaft 8! It is pivoted to allow thrust movement. The conveying roller 6 is pressed by a spring 9 against a conveying roller 5 which is rotated by being driven by a gear 4 which is rotationally driven by a drive source, and is driven to rotate. The advancing direction of the conveying roller 6 is inclined by the offset angle 0 between the fixing roller 12 and the sheet 9 as shown in the figure, and the sheet is sandwiched between the conveying roller 6 and the conveying roller 25, and the sheet is bitten by the fixing roller 12. It continues to rotate at the solid line position in Figure 2 until it is inserted. Then, when one sheet enters the fixing roller 12, the advancing direction of the sheet is moved and tilted in the direction of the offset angle a, and as shown in No. 3-, the sheet moves to a predetermined side until! according to its length. It is moved by j. In other words, the distance of the sea moving forward while moving in the thrust direction (width direction) is concentrated locally, resulting in a large sag.

Note that the separating rubber roller 2 and the separating roller 3 need to ensure straightness and driving cycle in conveying the sheet so as not to disturb the image transferred to the sheet. On the other hand, the conveying roller 5 and the conveying roller 6 are for conveying the sheet, but if the sheet traveling direction always maintains straightness, the fixing roller 12
The amount of movement of the sheet in the width direction due to the movement of the sheet is concentrated between the 1 conveyor 6 and the fixing port 12, resulting in a large sag 14, which may cause the unfixed image surface to come into contact with other members. To avoid this, the conveying roller 6ti sheet traveling direction is oriented in the same direction as the fixing roller 12 traveling direction.
As the sheet is moved in the width direction, it is moved to the position shown by the broken line in Figure 2 of the six conveyor rollers, which eliminates the thick slanting that occurs in the image, and prevents the sheet from coming into contact with other parts and disturbing the image. It is possible to transport it.

Next, FIG. 4 shows another embodiment of the conveying roller 6! This will be explained according to FIG. 5 and Section 6C. The conveyor rollers 6 are provided so as to be slidable on a shaft 161 of a member 16 fixed to a rotatable shaft 15 on the main body, and the conveyor rollers 6 are arranged at an angle O with the shaft 15 as the center. It has a so-called caster structure that is rotatable and also movable in the width direction depending on the amount of movement of the sheet.

In the one shown in FIG. 6, the inner diameter of the conveying wheel o6 is formed into a thin shaft 61, which is movable in the thrust direction of the shaft and can also be rotated by an angle of 0.

As explained above, according to the configuration of the present invention, even when the sheet is conveyed by guiding the leading end of the sheet in the conveyance direction from one end side first to the other end side, the sheet is conveyed. This can prevent sag in the width direction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 5 is a plan view 1 of the sheet advancing state, and FIGS. 4 and 5 are illustrations of another embodiment of the conveying roller. FIG. 6 is a sectional view of yet another conveying roller. In the figure, 5Fi conveyance roller. 6 is a conveyor cI (sheet conveyance auxiliary means). Applicant Canon Co., Ltd. Copia Co., Ltd. 207-

Claims (1)

[Claims] A sheet in which the leading edge of the sheet in the conveying direction is conveyed from one leading edge side first to the other edge side by means of a conveying means)
In the flN feeding device, a sheet conveying auxiliary means is provided on the upstream side of the conveying means in the sheet conveying direction and is allowed to move in the width direction according to the sheet conveyed by the conveying means and moved in the width direction of the sheet. A sheet conveying device comprising: