JPH11157707A - Skew correction mechanism by screw roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skew correcting mechanism in a device for carrying paper sheets and forms, capable of correcting a skew without accurately setting paper media, with improved function and operability. SOLUTION: This skew correction mechanism is provided with a screw roller 1 at the inside of a carrier passage. When correcting a skew using the screw roller 1 while carrying a paper medium 6, the rotating shaft of the screw roller 1 is laid in a parallel to the rotating shaft of carrier rollers 7, and a part of the screw roller 1 is configured so that its cross-section does not protrude from the carrier passage surface, that is, in such a way as to have a cut surface across the carrier passage surface. This arrangement allows the screw roller 1 to retreat from the carrier passage by the same rotating motion as that for skew correction. Further, stoppers 4 and a sensor 5 are provided to know that the medium 6 is placed in a correct position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus which requires conveyance of paper sheets and forms, and more particularly, to an apparatus for correcting skew without requiring an operator or a paper feeding mechanism to accurately set a medium. The present invention relates to a skew correction mechanism with improved functions and improved workability of an operator.

[0002]

2. Description of the Related Art In a conventional medium transport skew mechanism, rollers for transporting a medium in a direction of about 45 degrees with respect to the transport direction as means for correcting skew are arranged, and a skew correction roller is transported. It was necessary to arrange at a different angle from the roller.

[0003] As a conventional example, Japanese Patent Application Laid-Open No. 8-21520 is disclosed.
There is a medium skew correction mechanism described in Japanese Patent Application Laid-Open Publication No. 1 (1999). As shown in FIG. 5 of this publication, as a means for transporting a medium in a side guide direction, a technique of arranging rollers in a direction oblique to a transport path is described.

[0004]

In the above-described skew correction mechanism of the prior art, a skew correction roller is disposed in a conveyance path in a direction different from the conveyance direction as means for correcting a skewed medium material in a correct direction. There was a problem that it was necessary.

Further, since the skew is corrected by rotating the roller, a plurality of driving forces are transmitted to a rotating shaft in a direction different from the rotating shaft of the transport roller in order to transmit the driving force to the roller. There was a problem that parts were required.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problem, and it is possible to correct skew in a device for transporting sheets and forms without accurately setting a medium. An object of the present invention is to provide a skew correction mechanism with improved functionality and operability.

[0007]

In order to solve the above-mentioned problems, a skew correction mechanism according to the present invention is provided in a transport mechanism having a transport roller and a transport path for transporting a medium such as a paper sheet or a form. A skew correction mechanism that corrects the skew of the medium inside the transport path in order to accurately correct the media set and transport when the position of the medium is set incorrectly, and is provided inside the transport path. The skew correction can be performed while the medium is conveyed by the screw roller by providing the screw roller provided.

Further, it is preferable that the rotation axis of the screw roller is parallel to the rotation axis of the transport roller.

Further, by forming a part of the sectional shape of the screw roller so as not to protrude from the conveying surface,
It is preferable to be able to retreat from the transport path by the same rotation operation as the skew correction operation.

[0010] Furthermore, it is preferable that the cross-sectional shape of the screw roller is a shape in which a part of a circular shape is cut out.

It is preferable that a stopper for stopping the medium at an accurate position is provided.

Further, it is preferable that the screw roller is a rubber screw roller having a directionality of a screw.

Still further, in the vicinity of the exact position of the medium,
It is preferable to provide a sensor that senses the passage of the medium.

In the skew correction mechanism using a screw roller according to the present invention, in particular, by disposing a screw roller for skew correction in the conveyance path, the rotation axis of the screw roller can be arranged in parallel with the conveyance roller. The transmission of force can be simplified, and the number of components of the mechanism for transmitting the drive can be reduced.

Further, by setting a part of the screw roller so as not to protrude from the conveying surface, it is possible to improve the setability of the medium, and the screw roller is retracted in order to prevent the medium from being caught on ejection. In other words, in order to retract the screw roller so as not to hinder the transport of the medium during ejection,
No special mechanism is required.

Further, when the setting of the medium is not performed accurately, the medium can be automatically corrected to the correct set while conveying the skewed medium.

As described above, by using a screw roller to correct the skew of the medium, the mechanism can be simplified, the reliability can be improved, and the cost can be reduced.

[0018]

Next, an embodiment of the present invention will be described.
This will be described in detail with reference to the drawings.

FIG. 1 is a top view showing the configuration of an embodiment of a skew correction mechanism using a screw roller according to the present invention. The skew correction mechanism includes a transport roller 7, a transport guide 8 serving as a guide for transporting the medium 6, a side guide 3 provided on a side surface of the transport guide 8, and a stopper 4 serving as a reference for stopping the medium. , Sensor 5 and screw roller 1. The screw roller 1 is a rubber screw roller having a directionality of a screw in a direction of an intersection between the side guide 3 and the stopper 4, and is disposed in the transport path. By rotating the screw roller 1, the skewed medium 6 is conveyed toward the side guide 3 and the stopper 4. The sensor 5 is arranged to recognize that the position of the medium 6 has been set correctly, and the sensor 5 blocks light when the medium 6 passes through the sensor 5.

FIGS. 2 and 3 are side views showing the operation of the embodiment of the skew correction mechanism using the screw roller of the present invention.
As shown in FIGS. 2 and 3, the screw roller 1 has a cut surface 1a in which a part of a substantially circular cross section is cut out.
However, FIG. 2 shows a state in which the cut surface 1a is on the opposite side of the transport guide 8, and FIG.

First, as shown in FIG. 2, in this embodiment,
After retracting the stopper 4 from the transport path, the screw roller 1 is rotated to transport the medium 6 until the transport roller 7 clamps the medium 6.

Next, as shown in FIG. 3, in this embodiment,
As described above, since the screw roller 1 has the cut surface 1a, a part of the screw roller 1 is formed so as not to protrude from the transport surface of the transport guide 8. Therefore, when the medium 6 is discharged, the screw roller 1 can be stopped at a position where the screw roller 1 does not rotate and protrude, that is, at the cut surface 1a, in order to prevent the screw roller 1 from being caught.

[0023]

According to the skew correction mechanism of the present invention, the skew correction and the transport of the medium are performed by the rollers, so that the screw roller shaft can be arranged in parallel with the axis of the transport roller. This has the effect of facilitating transmission of the driving force.

Further, by forming a part of the shape of the screw roller so as not to protrude into the transport path, the screw roller performs the same rotational drive as the skew correction operation when the medium is set and when the medium is ejected. Can be evacuated, and no special mechanism is required. Therefore, there is an effect that the size and cost of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view showing an embodiment of a skew correction mechanism using a screw roller according to the present invention.

FIG. 2 is a side view showing the operation of the embodiment of the present invention.

FIG. 3 is a side view showing the operation of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw roller 1a Cut surface 2 Skew medium 3 Side guide 4 Stopper 5 Sensor 6 Medium 7 Transport roller 8 Transport guide 9 Follower roller

Claims (7)

[Claims] In a transport mechanism having a transport roller and a transport path for transporting a medium such as a paper sheet or a form, when the position of the medium is incorrectly set, the setting of the medium is accurately corrected. A skew correction mechanism for performing a skew correction of the medium inside the transport path in order to perform the transport by transporting the medium by the screw roller by providing a screw roller provided inside the transport path. Wherein the skew is corrected while performing the skew. 2. The skew correction mechanism according to claim 1, wherein a rotation axis of said screw roller is parallel to a rotation axis of said transport roller. 3. The screw roller can be retracted from the conveyance path by the same rotation operation as the skew correction operation by forming a part of the cross-sectional shape of the screw roller so as not to protrude from the conveyance surface. The skew correction mechanism according to claim 1 or 2, wherein 4. The skew correction mechanism according to claim 3, wherein a cross-sectional shape of the screw roller is a shape in which a part of a circle is cut off. 5. The skew correction mechanism according to claim 1, further comprising a stopper for stopping the medium at an accurate position. 6. The skew correction mechanism according to claim 1, wherein said screw roller is a rubber screw roller having a directionality of a screw. 7. The skew correction mechanism according to claim 1, further comprising a sensor near the correct position of the medium, the sensor detecting the passage of the medium.