JPH07334630A - Form tilt correction mechanism - Google Patents

Abstract

PURPOSE:To provide a correction mechanism which can perform the stable right-left positioning and the tilt correction of forms by controlling these operations to prevent the jam, breakage, etc., of a form that has been conveyed with a large tilt. CONSTITUTION:A form 3 is conveyed to the positions of sensors 12 and 13, and the tilt amount of the form 3 is measured. If the form 3 tilts in the direction where the side of the form 3 opposite to its reference face 10 travels first with a tilt amount larger than a set value, the revolutions of drive rollers are stopped. Then, the drive rollers are revolved in the direction opposite to the conveying direction of the form 3, and the form 3 is bent between the drive rollers so that the tip of the form 3 touches the drive rollers and a pressure roller 18b. Thus, the tilt of the form 3 is corrected. Then, the drive rollers are revolved forward to bite the form 3 and a pressure roller 18a is lifted together with an oblique roller 9 pressed to a conveying surface. The roller 18b is lifted and the press contact states of both rollers 18a and 18b are canceled for correction of the skew of the form 3. Thus, the form 3 is conveyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form inclination correcting mechanism, and more particularly to a form inclination correcting mechanism suitable for a printing apparatus or an OCR / image reading apparatus that needs to convey a form to an accurate position.

[0002]

2. Description of the Related Art Conventionally, as a form inclination correcting mechanism, for example, as described in Japanese Patent Publication No. 62-38261, two sets of drive rollers arranged in parallel have a drive roller on the conveying direction side. After the leading edge of the abutting paper has passed, it is rotated in the reverse direction with respect to the transport direction, at the same time the drive roller on the rear side in the transport direction is stopped, the form is bent between two sets of rollers, and the leading end of the form hits the meshing part of the drive roller. A method of contacting and correcting the inclination of the form is known. Although the above method can correct the inclination of the form with a simple configuration, no consideration is given to the positioning of the form in the direction perpendicular to the conveying direction.

[0003]

Generally, when printing on a form having a print frame, it is necessary not only to correct the inclination of the form but also to position the form in the left-right direction. However, in the above-mentioned conventional technique, although the inclination of the form can be corrected, no consideration is given to the lateral positioning. As a method of performing the lateral positioning, for example, a method of pressing the side surface of the form against a reference surface with a roller is known. However, there is a case where the required inclination accuracy of the form cannot be obtained only by pressing the reference surface with the roller, and it is conceivable to use the pressing of the reference surface with the roller together with the above-mentioned conventional technique. If there is only one type of form here, the roller can press the form against the reference surface at the same drive amount at right angles to the reference surface, but it has various sizes and thicknesses. When the form is pressed at right angles to the reference surface, the position of the center of gravity of the form and the resistance force are different, which causes a problem. Therefore, a method is used in which the form is moved diagonally with respect to the transport direction and pressed against the reference surface. However, even in this case, if the amount of tilt before pressing is large, the form edge portion collides with the reference surface, causing paper breakage or jam, and increasing the amount of tilt. An object of the present invention is to improve such problems and provide a stable inclination correction mechanism even for a form having a large amount of inclination. That is, it is an object of the present invention to prevent paper jams, folds, and the like of a form conveyed with a large inclination, and to perform left-right positioning and stable inclination correction.

[0004]

In order to achieve the above object, the inclination correcting mechanism of the present invention comprises two driving rollers (17a and 17b in FIG. 2) arranged in parallel on the conveying path. Along with the pressing rollers (18a, 18b in FIG. 1) for sandwiching the form, means for independently driving / pressing the driving roller and the pressing roller (driving motor, etc. (not shown)), and oblique to the form conveying direction The skew roller (9 in FIG. 1) attached to the sheet, means for driving / pressing the skew roller (bracket, drive motor, etc. (not shown)), and a plurality of sensors (see FIG. 1) provided on the conveyance path. 12, 13),
A guide unit (10 in FIG. 1) provided at the end of the conveyance path between the two sets of rollers is provided, and the control unit (CPU or the like, not shown) measures the inclination of the conveyance form by the sensor. Each operation sequence is selected according to the obtained tilt amount, and the control is performed such that "the form is bent between two sets of rollers arranged in parallel and the leading end of the form is brought into contact with the meshing portion of one driving roller and the pressing roller ( Tilt correction) "and" Control until the side of the form is pressed against the guide means by releasing the pressing roller and pressing / driving the skewing roller until the form is detected by the reference surface edge sensor (right and left positioning) ) ”Is performed.

[0005]

In the present invention, when the conveyed document is inclined in the direction in which the opposite side of the reference surface advances, if the amount of inclination is large, when the sheet is pressed against the reference surface by the skew roller, Since the edge portion first collides with the reference surface, the inclination is first taken by the bending between the two sets of drive rollers, and then the skew roller is pressed against the reference surface. As a result, the form is prevented from colliding with the reference surface with a large inclination, so that it is possible to prevent breakage and jam. In addition, by providing a sensor near the reference surface, even if a document with a large inclination is pressed against the skew roller, the drive of the skew roller is stopped before the edge of the document strongly presses against the reference surface, causing a paper break or jam. Can be prevented. For example, when the skew of the conveyed document is such that the opposite side of the reference surface advances, and the skew amount is larger than a preset skew amount, two sets of rollers (drives arranged in parallel) are set. Roller and pressure roller) to correct the tilt, then the skew roller presses the side surface of the form against the reference surface to correct the left and right position of the form and the tilt, and if the amount of tilt is larger than the set value,
The inclination is corrected by two sets of rollers arranged in parallel.
Further, in this case, the sheet is conveyed by the skew rollers until the sheet is detected by the sensor arranged in the vicinity of the reference surface, and then the inclination is corrected by the two sets of rollers arranged in parallel. In other cases, only the specified amount is conveyed by the skew roller. As described above, it is possible to stably perform left-right positioning (shift correction) and correction of the inclination with respect to a document conveyed with a large inclination.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a tilt correcting mechanism according to a first embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG.
(E) shows operation | movement of a present Example. First, the configuration will be described. The inclination correcting mechanism of the present embodiment includes drive rollers 17a and 17b and a pressure roller 1 facing the drive rollers 17a and 17b.
8a and 18b, a skew roller 9 that is obliquely attached to the form conveyance direction, a reference surface 10 against which the form is pressed, sensors 12 and 13 for detecting the amount of inclination of the form, and paper guides 1a and 1b. , 2, 3a, 3b. The pressure rollers 18a and 18b are configured so that they can be lifted from the drive rollers 17a and 17b by pressing release means (not shown). The drive rollers 17a and 17b can be independently driven by a drive unit (not shown) such as a motor. Further, the skew roller 9 is configured to be in pressure contact with the conveying surface by a skew roller vertical drive mechanism (not shown). The skew roller up-and-down drive mechanism may be composed of, for example, a bracket rotatably supported by a shaft of the skew roller, a drive motor, a worm shaft, a belt for transmitting a driving force, and the like. It should be noted that control of the entire mechanism including control of each driving means is performed by a control unit (for example, a processing device such as a CPU) not shown.

The inclination correcting operation of this embodiment will be described. First, as shown in FIG. 3A, the form 3 is conveyed to the positions of the sensors 12 and 13, and the inclination amount of the form is measured by the sensors 12 and 13. As a result, when the inclination measured by the sensors 12 and 13 is the inclination in the direction in which the side opposite to the reference surface 10 advances (the inclination direction of the form 3 shown in FIG. 1) and is larger than the preset inclination amount. Stops the drive roller 17a. Next, as shown in FIG. 3B, the drive rollers 17a and 17b are rotated in the direction opposite to the document conveyance direction, whereby the drive rollers 17a and 17b are rotated.
Bend the form 3 between. In this way, the leading edge of the form is brought into contact with the meshing portion of the drive roller 17b and the pressure roller 18b to correct the inclination. Next, as shown in FIG. 3 (c), the drive roller 17b is slightly rotated in the forward direction so that the form 3 is caught therein, and then the pressure roller 18a is lifted by the pressing releasing means. Next, as shown in FIG. 3D, the skew roller 9 is brought into pressure contact with the conveying surface by the skew roller vertical drive mechanism, and the pressure roller 18b is lifted. Therefore,
The pressure rollers 18a and 18b are also released from pressure contact.
Further, the skew roller 9 is driven to press the form 3 against the reference surface 10 to correct the skew. Finally, as shown in FIG. 3E, the pressure rollers 18a and 18b are brought into pressure contact with each other,
The skew roller is lifted up and conveyed. At this time, the sensor 1
The skew amount is measured by 2 and 13, and when it is larger than the preset tilt amount, the operation of FIG. 3B is performed again. Further, when the inclination amount measured in FIG. 3A is smaller than the preset inclination amount and is the inclination in the opposite direction (the inclination opposite to the form 3 shown in FIG. 1), the form 3 Is returned by a certain amount, and as shown in FIG. 3 (d), the pressure rollers 18a and 18b are lifted, the skew roller 9 is lowered, and the pressure roller 18 is pressed against the reference surface 10. Then, as shown in FIG. 3 (b). Perform the actions.

FIG. 4 is a plan view of an inclination correcting mechanism according to the second embodiment of the present invention. In this embodiment, in addition to the configuration of the first embodiment, a sensor 14 for detecting the form 3 is added near the reference surface 10. In this embodiment, form 3
When the sheet 14 is pressed against the reference surface 10 by the skew roller 9, when the sensor 14 detects the form 3, the driving of the skew roller 9 is stopped, and the inclination is corrected by bending between the drive rollers 17a and 17b. Further, when the inclination of the form 3 is large in the direction opposite to that shown in the drawing, and when the side surface of the form 3 hits the edge 10a of the reference surface 10 and the sensor 14 cannot detect the form 3, the skew roller is used. 9 is driven by a certain amount, and after the sensor 14 detects the form 3, the skew roller 9 is controlled to be stopped similarly to the above.

[0009]

As described above, according to the present invention, it is possible to stably position the left and right positions and correct the inclination of a form that has been conveyed with a large inclination, without causing a paper break or a jam.

[Brief description of drawings]

FIG. 1 is a plan view of a tilt correcting mechanism according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a tilt correcting mechanism according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a tilt correcting operation in the first embodiment of the present invention.

FIG. 4 is a plan view of a tilt correcting mechanism according to a second embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 2, 3a, 3b: paper guide, 3: form,
9: skew roller, 10: reference surface, 10a: edge of reference surface, 12, 13, 14: sensor, 17a, 17b: drive roller, 18a, 18b: pressure roller.

Claims (1)

[Claims] 1. A pair of driving rollers arranged in parallel on a conveying path, a pressing roller for holding a document together with the driving rollers, and a driving roller and a pressing roller which are driven independently.
Depressing means, skew rollers mounted obliquely with respect to the document conveying direction, means for driving / pressing the skew rollers, a plurality of sensors provided on the conveying path, and conveying between the two sets of rollers. A guide means provided at the end of the road, a sensor provided at the end of the reference surface of the guide means, and an operation sequence is selected based on the amount of inclination of the transport form obtained by the detection of the plurality of sensors, The control is performed by bending the form between the drive rollers so that the leading end of the form is brought into contact with the meshing portion of the one drive roller and the pressing roller, and the pressing roller is released until the form is detected by the reference surface end sensor. And a means for performing control to press / drive the skew roller to press the side surface of the form against the guide means.