JPH06215201A - Medium skew correcting mechanism - Google Patents

Abstract

PURPOSE:To improve the printing and reading precision of an automatic machine for executing the automatic issue, printing, image reading, and optical character reading(OCR) of paper sheets and documents by a master system. CONSTITUTION:When a medium 1 is carried by a carrier roller 3 and arrives at a sensor 6, the existence of skew correction and opening operation of a guide 10 are judged by the sensor 6, and when skew correction is required, a skew correcting roller 7 arranged on the upper part of a carrier is allowed to closely adhere to the medium 1, a pressure roller 8 is moved upwards and the roller 7 is rotated, so that the medium 1 is pressed to a side guide and skew correction is executed. When the length of the medium 1 reaches a curve, the resistance of the medium 1 due to the curve is reduced by opening the guide 10 to correct skew. Consequently the side of the device can be reduced.

Description

Detailed Description of the Invention

[0001]

[Industrial field of use] Printer printing operation after feeding a medium, in which the medium stop must be secured at a correct position, OC
It can be used for all automatic machines for performing R and image reading operations.

[0002]

2. Description of the Related Art Sheets to be skew-corrected as disclosed in Japanese Patent Laid-Open No. 1-176751 are skew-corrected at a linear distance portion of a medium-conveying system in order to prevent the sheet from being conveyed from the conveying system. I needed a straight line distance.

[0003]

If skew correction of an apparatus using media of different lengths is performed by the conventional method, a linear distance corresponding to the maximum length of the medium used must be secured, so that the apparatus can be miniaturized. Becomes very difficult.

Therefore, it is possible to perform skew correction irrespective of the length of the medium, and to perform skew correction with a linear distance of the minimum dimension of the medium used, thereby miniaturizing the apparatus.

[0005]

[Means for Solving the Problems] When a linear distance having a minimum dimension of a medium to be used is secured, and when the medium has a deviation curve from a straight portion, the medium is bent or resistance is increased by opening a guide of the curved portion. The device is downsized by correcting the skew.

[0006]

[Action]

1. In order to correct the skew of the medium, the pressure roller that opposes the conveying roller is moved to the upper part to free the medium, and the medium is pressed against the side guide by the skew correcting roller.

2. Minimize the linear distance of the medium transport section,
When the medium is longer than the straight line distance, the guide of the curved portion is opened to reduce the movement resistance of the curved portion of the medium to facilitate skew correction.

(If the guide of the curved portion is not opened and the medium is bent along the guide, it becomes a resistance at the time of skew correction and becomes insufficiently pressed against the side frame, or only the skew correction roller portion is skew-corrected, and conversely the skew is generated. Increase.)

[0009]

1 and 2 show top and side views of the prior art.

FIGS. 3, 4 and 5 show a top view and a side view of an embodiment of the present invention.

An embodiment will be described below with reference to the drawings.

The medium 1 fed out from the hopper or the storage is conveyed by the conveying means such as the belts 2 and 5 conveying rollers 3. However, the medium posture at the time of feeding is not constant, and the beginning of the medium 1 in the conveyed state is , It is completely unknown how it is leaning. Therefore, in the conventional technique, when the medium 1 is skewed and conveyed by the conveyor belt 2 in the direction A on the conveyor path 4, the medium 1 is conveyed to the belts 2 and 5 until it reaches the next conveyor belt 5.
A pair of medium receiving means 4 rotating at a low speed is provided with a space of a linear distance not restricted by the length of the medium 1 or more.
Skew was corrected by providing a and 4b.

According to the present invention, the sensors 6 are arranged on both ends of the medium 1 in the conveying path, the skew of the conveying medium is investigated, and when the medium 1 is skewed by a certain amount or more, the following is performed. Skew correction to.

When it is necessary to correct the medium 1 based on the information from the sensor 6, the medium 1 is stopped at a fixed position, the skew correction roller 7 previously installed above the conveying path is lowered, and the medium 1 is fixed. The pressure roller 8 that opposes the transport roller 3 is moved upward to perform skew correction.

As shown in FIG. 4, in skew correction of a short medium which does not follow a curve, the skew correction roller 7 is rotated to press the side guide 9 and the skew correction is completed.

As shown in FIG. 5, skew correction of the medium 1 having a long curve is performed by opening the guide 10 in the curve portion to reduce the resistance to movement of the medium 1 due to the curve so that the medium 1 can be easily moved. The correction roller 7 is rotated to complete the skew correction.

As described above, by interrogating the guide 10 of the curved portion, skew correction can be performed for media having different lengths with a short linear distance.

After the skew correction, the pressure roller 8
Is pressed against the conveyance roller 3, the medium is fixed, the guide 10 at the curved portion is returned to the fixed position, and the skew correction roller 7 is moved upward to convey the medium.

The skew-corrected medium is used for printing operation, OC
The medium is conveyed to the R and image reading positions and a predetermined operation is performed to issue the medium to the issuing port.

[0020]

According to the present invention, the straight line distance for skew correction when the length of the medium used is not constant is set to the minimum size of the medium, and the skew correction of the medium having the maximum size is performed by opening the curved portion guide. By securing the distance, the device can be downsized without increasing the linear distance even when the medium length is not constant.

[Brief description of drawings]

FIG. 1 is a top view of the prior art.

FIG. 2 is a side view of the prior art.

FIG. 3 is a top view of the present embodiment.

FIG. 4 is a side view of the present embodiment.

FIG. 5 is a side view of the skew correction operation of the present embodiment.

[Explanation of symbols]

 1 ... Medium, 2 ... Belt, 3 ... Conveying roller, 4 ... Conveying path, 5 ... Conveying belt, 4a, 4b ... Medium receiving means, 6 ... Sensor, 7 ... Skew correction roller, 8 ... Pressure roller, 9 ... Side guide , 10 ... Guide.

Claims (3)

[Claims] 1. A medium skew correction mechanism for performing skew correction after feeding a medium by performing a skew correction at a short linear distance by opening and closing a guide of a curved portion. 2. A medium skew correction mechanism according to claim 1, wherein skew correction is performed without opening the guide when the medium length is detected and the medium is not curved. 3. The skew correction capability is reduced when the medium is caught in a roller or the like for skew correction, so that the transport roller or the like has a mechanism for freeing the medium. The described medium skew correction mechanism.