JPS59194946A - Oblique-travelling correcting apparatus for sheet material - Google Patents

Abstract

PURPOSE:To correct the oblique advance of the top edge of a sheet material by installing a subguide for converting the direction of transport of the sheet material by providing deformation onto the sheet material, in a guide for introducing the sheet material into a resistor roller, thus generating deflection on the sheet material. CONSTITUTION:A cut paper-sheet 1 is stored in a paper-sheet feeding cassette 2 and pressed onto a pick-up roller 5 by the force of a spring 4 through a bottom plate 3. Said cut paper-sheet 1 is driven-out from a pasteboard cassette 2 by the revolution of the above-described roller 5 and separated one by one by a separating hook 6. Then, the cut paper sheet 1 is introduced into a feeding roller 8 along an entry guide 7 and further introduced into a resistor roller 10 along a guide 9. In this case, a subguide 1 and an air hole 12 are provided, in order to certainly generate deflection on the cut paper-sheet 1 in the guide 9. Therefore, even in the case where the cut paper-sheet 1 on which deflection is hardly generated is transported, the cut paper-sheet 1 can be certainly deflected, and the oblique advance of the top edge can be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for correcting skew feeding of a sheet material that is skewed during conveyance in a copying machine, a printer, or the like.

[Background of the invention]

Taking electrophotographic copying machines as an example, register rollers have conventionally been used to synchronize the sheet material that is the transfer paper and the photoreceptor. The register cola can rotate and stop freely, and when it is temporarily stopped, the leading edge of the sheet material being conveyed is pressed against it, and the sheet material is moved by using the force of the sheet material being continuously conveyed. This is to correct the skew of the image. In this method, in order to obtain the skew correction effect by bringing the entire leading edge of the sheet material into contact with the register rollers, the sheet material is pressed against the register rollers, and the bends and bends that cause the sheet material to buckle are eliminated. It is transformed to the state it is in.

However, with these conventional methods, as the thickness of the sheet material increases and the rigidity increases, it becomes difficult for the sheet material to flex, and the impact when the sheet material contacts the register roller becomes severe υ. There is a drawback that skew correction cannot be performed because no error occurs.

[Purpose of the invention]

An object of the present invention is to improve a skew correction device so that skew correction can be performed even for a sheet material that is difficult to bend by simply pressing its leading edge against the register row 2.

To achieve the above object, the sheet material skew correction device of the present invention includes a register roller that temporarily stops a sheet material being conveyed and then starts conveying it, and a register roller that guides the sheet material to the register roller. It consists of a guide and a sub-guide that is located within the guide and deforms the sheet material to change the conveying direction of the sheet material. The above sub-guide gives out-of-plane deformation to the sheet material being conveyed, so
After the sheet material has been deflected in advance, it is pressed against the registration rollers.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a cut paper separation and conveyance device. The cut paper 1 is stored in a paper feed cassette 2, and is pressed against a pickup roller 5 via a bottom plate 3 by the force of a spring 4. The cut paper 1 is taken out from the mount cassette 2 by rotation of the pickup roller 5. At this time, the cut sheets 1 are separated one by one by the action of the separating claws 6 and ejected from the sheet feed cassette 2. The cut paper 1 guided by the entry guide 7 to the feed roller 8 is conveyed by the feed roller 8, and then guided to the registration roller 10 by the guide 9. At this point, the register roller 10 is stopped, so the cut sheet 1 receiving the conveyance force from the feed roller 8 is
It is pressed against the register roller 10. At this time, if the cut sheet 1 is bent due to out-of-plane deformation, the leading edge of the cut sheet 1 is uniformly pressed against the register roller 10, and the skew is corrected. After the skew correction is completed, the register rollers 10 start rotating, and the cut paper 1 is conveyed by the conveying force of the register rollers 10. If cut paper 1 is thick or made of hard material, cut paper 1
Even if it is pressed against the register roller 10, there may be no deflection. Since the feed roller 8 clamps the cut paper 1, if there is no deflection, the leading edge of the skewed cut paper cannot uniformly touch the register roller 10.

As a result, skew correction is not performed. Therefore, a sub-guide 11 is provided to ensure that the deflection occurs within the guide 9. One sheet of cut paper conveyed by the feeding roller 28 changes its direction upward along the sub-guide 11. Further, the cut paper 1 is conveyed by the feed row 28 and guided along the guide 9 located above, and the cut paper 1 is guided by the register roller 1.
It leads to 0. At this time, the cut sheet 1 has already begun to bend as indicated by the broken line 13, which is necessary for the skew correction, so that it can be pressed against the register roller 10 and easily bent. As a result, the skew correction can be easily performed. In this way, the cut paper 1 is deflected preliminarily by the sub-guide 11, and then pressed against the registration roller 10 to be deflected in earnest. At this time, air holes 12 are provided so that the deflection can be easily increased. This is because depending on the combination of the size of the cut paper 1 and the conveyance speed, air may not be sufficiently supplied to the bottom of the cut paper 1.
This is to prevent the occurrence of deflection from being suppressed.

〔Effect of the invention〕

As described in detail above, according to the present invention, skew correction is possible even when conveying a sheet material that does not easily bend, such as cardboard.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view illustrating a cut paper separation and conveyance device in which the sheet material skew correction device of the present invention is implemented. l...Cut paper, 2...Paper feed cassette, 8...Feed roller, 9...Guide, 10...Register roller, 11...Sub guide, 12...Air hole.

Claims (1)

[Scope of Claims] (1) Has a register roller that temporarily stops one sheet material being conveyed and then starts conveying it, and a guide that guides the sheet material to the register roller, and conveys the sheet material in an oblique state. A device for correcting skew feeding of a sheet material, characterized in that a sub-guide is provided within the guide and changes the conveying direction of the sheet material by deforming the sheet material. Device. 2. The sheet material skew correction device according to claim 1, wherein the sub-guide has a notch or a hole to allow air to enter and exit.