JP3616489B2 - Skew correction mechanism by screw roller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus that requires conveyance of paper sheets and forms, and in particular, corrects skew even when an operator or a paper feeding mechanism does not accurately set a medium, thereby improving the function of the apparatus and The present invention relates to a skew correction mechanism that improves workability.
[0002]
[Prior art]
In the conventional medium conveyance skew mechanism, a roller in the conveyance direction is arranged to convey the medium in the direction of about 45 degrees with respect to the conveyance direction as means for correcting the skew, and the skew correction roller is set at a different angle from the conveyance roller. There was a need to place.
[0003]
As a conventional example, there is a medium skew correction mechanism described in JP-A-8-215201. As shown in FIG. 5 of this publication, as a means for transporting a medium in the side guide direction, a technique is described in which rollers are arranged obliquely with respect to the transport path.
[0004]
[Problems to be solved by the invention]
The conventional skew correction mechanism described above has a problem that it is necessary to arrange a skew correction roller in a direction different from the transport direction in the transport path as a means for correcting the skewed medium material in the correct direction. It was.
[0005]
In addition, since the skew is corrected by rotating this roller, in order to transmit the driving force to the roller, a plurality of parts are required to transmit the driving force to the rotating shaft in a direction different from the rotating shaft of the conveying roller. There was a problem of becoming.
[0006]
Accordingly, an object of the present invention is to solve the above-mentioned problems, and in a device for conveying paper sheets and forms, skew can be corrected without accurately setting a medium, and the functionality of the device, An object of the present invention is to provide a skew correction mechanism with improved operability.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the skew correction mechanism of the present invention includes a screw roller provided inside the conveyance path , and the medium is brought into contact with the screw roller by the weight of the medium and conveyed to thereby skew the medium while conveying the medium. It is possible to perform the correction.
[0008]
Moreover, it is preferable that the rotating shaft of a screw roller is parallel to the rotating shaft of a conveyance roller.
[0009]
Furthermore, it is preferable that the screw roller can be retracted from the conveyance path by the same rotation operation as the skew correction operation by making a part of the cross-sectional shape not to protrude from the conveyance surface.
[0010]
Furthermore, it is preferable that the cross-sectional shape of the screw roller is a shape obtained by cutting out a part of a circle.
[0011]
It is preferable to provide a stopper that stops the medium at an accurate position.
[0012]
Further, the screw roller is preferably a rubber screw roller having a screw directionality.
[0013]
Furthermore, it is preferable to provide a sensor that senses when the medium passes in the vicinity of the accurate position of the medium.
[0014]
In the skew correction mechanism using the screw roller of the present invention, in particular, by arranging 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, thereby transmitting the driving force. Can be simplified, and the number of parts of the mechanism portion that performs drive transmission can be reduced.
[0015]
Further, by setting a part of the screw roller so as not to protrude from the conveying surface, it is possible to improve the medium setting property, and the screw roller is retracted to prevent the medium from being caught during ejection. That is, no special mechanism is required because the screw roller is retracted so as not to hinder the conveyance of the medium during ejection.
[0016]
Furthermore, when the medium is not accurately set, the skewed medium can be automatically corrected to the correct set while being conveyed.
[0017]
As described above, by using a screw roller and correcting the skew of the medium, the mechanism can be simplified, and the reliability can be improved and the cost can be reduced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
FIG. 1 is a top view showing a configuration of an embodiment of a skew correction mechanism using a screw roller of 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. The sensor 5 and the screw roller 1 are provided. The screw roller 1 is a rubber screw roller having a screw directivity in the direction of the intersection between the side guide 3 and the stopper 4 and is disposed in the conveyance path. By rotating the screw roller 1, the skewed medium 6 is conveyed in the direction of the side guide 3 and the stopper 4. The sensor 5 is arranged for recognizing that the position of the medium 6 is set correctly, and the sensor 5 shields the light when the medium 6 passes through the sensor 5.
[0020]
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, and the state in which the cut surface 1a is on the opposite side of the conveyance guide 8 is shown in FIG. FIG. 3 shows a state where the cut surface 1a is on the conveyance guide 8 side.
[0021]
First, as shown in FIG. 2, in the present embodiment, after the stopper 4 is retracted from the conveyance path, the screw roller 1 is rotated to convey the medium 6 until the medium 6 is clamped by the conveyance roller 7.
[0022]
Next, as shown in FIG. 3, in this embodiment, as described above, the screw roller 1 has the cut surface 1 a so that a part of the screw roller 1 does not protrude from the conveyance surface of the conveyance guide 8. . Accordingly, when discharging the medium 6, in order to prevent the screw roller 1 from being caught, 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.
[0023]
【The invention's effect】
In the skew correction mechanism of the present invention, it is possible to arrange the screw roller shaft in parallel with the axis of the transport roller by performing the skew correction and the transport of the medium by the roller, and it is possible to transmit the rotational driving force with a simple mechanism. There is an effect that it becomes easy.
[0024]
In addition, by making a part of the shape of the screw roller so as not to protrude into the conveyance path, the screw roller retracts from the conveyance path by performing the same rotational drive as the skew correction operation when setting the medium and discharging the medium. And no special mechanism is required. Therefore, there is an effect that the apparatus can be reduced in size and cost.
[Brief description of the drawings]
FIG. 1 is a top view showing an embodiment of a skew correction mechanism using a screw roller of 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 Cutting surface 2 Skew medium 3 Side guide 4 Stopper 5 Sensor 6 Medium 7 Conveyance roller 8 Conveyance guide 9 Driven roller

Claims (1)

In a transport mechanism having a transport roller for transporting a medium such as paper sheets and forms, and a transport path for guiding the medium to the transport roller, when the position of the medium is set inaccurately, A skew correction mechanism for performing skew correction of the medium inside the conveyance path in order to accurately correct the set and carry it;
Provided inside the conveying path, a rotating shaft provided parallel to the rotational axis of the conveying roller, possess a cutting surface, with parts cut away, of circular cross-section, provided on the side surface of the conveying path A screw roller having a screw direction in the direction of the intersection of the side guide and the stopper serving as a reference for stopping the medium ;
When the medium is transported, the medium is brought into contact with the screw roller by the weight of the medium, and the skew is corrected while transporting until the medium is clamped by the transport roller by rotating the screw roller,
When discharging the medium, the screw roller is stopped at a position where the cut surface of the screw roller and the conveyance path are flush with each other so that the screw roller does not protrude onto the conveyance path, and the medium is discharged. A skew correction mechanism.

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