JP2006036462A - Paper conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To convey paper in the state fitted to the paper while preventing generation of wrinkle. <P>SOLUTION: The paper conveying device is constituted such that a conveying driving roller is provided on one side clamping a paper conveying surface for conveying the paper 2, a driven roller is provided on the other side clamping the paper conveying surface and the paper 2 can be conveyed by driving the conveying driving roller. The conveying driving roller and the driven roller are constituted so as to be provided with a pair of roller bodies 9 independently arranged at left and right positions in the paper conveying surface respectively. The pair of roller bodies 9 in at least any one of the conveying driving roller and the driven roller is constituted such that an axis of the roller body 9 relative to a reference line K can be angle-changed along the paper conveying surface making a direction perpendicular to the conveying direction in the paper conveying surface as the reference line K. An angle changing operation means Y for changing/operating the angle of the axis of the roller body 9 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a conveyance driving roller is provided on one side of the paper conveyance surface for conveying paper, and a driven roller is provided on the other side of the paper conveyance surface, and the conveyance driving roller is driven. The present invention relates to a paper transport device configured to transport paper.

This type of paper transport device is designed to sandwich the paper from the front and back with a roller and convey the roller driving force to the paper by the friction between the roller and the paper, so that the condition of the paper surface greatly affects the transport state. easy. There are various situations for the target paper. For example, the physical properties may differ depending on the location of the paper, or the distribution of ink may differ depending on the location when printing or the like is performed. As a result, the friction between the rollers and the paper varies, and the paper may wrinkle as the paper is fed.
Therefore, in order to solve this problem, conventionally, as this type of paper transport apparatus, as shown in FIG. 6, the transport drive roller 7 is a pair of paper sheets arranged separately at the left and right positions on the paper transport surface 6. The pair of roller bodies 9 is mounted so that the inner end portions of the roller bodies 9 are positioned in front of the outer end portions of the roller bodies 9 by a predetermined dimension in the paper conveying direction. When a paper is conveyed, a force that feeds the paper forward is always applied while spreading the paper left and right to prevent wrinkling (for example, see Patent Document 1).

JP-A-6-321368 (FIG. 1)

  According to the above-described conventional paper transport device, the pair of roller bodies 9 are arranged such that the inner end portions of the roller bodies 9 are positioned in front of the outer end portions of the roller bodies 9 by a predetermined dimension in the paper transport direction. As described above, the vector force in the left-right direction of the paper by the pair of roller bodies makes it difficult for the paper being conveyed to be wrinkled, but what is the vector force by the pair of roller bodies? Since it works in the same way on a simple paper, it is difficult to change the vector force in consideration of the paper quality, paper condition, and the like. For example, thick paper is less likely to wrinkle than thin paper, or the difference in paper size and the moisture content of the paper is likely to cause a difference in wrinkle deviation during transportation. According to the paper transport device, it is difficult to cope with such differences in paper quality and paper state. As a result, there is a risk that when the vector force in the left-right direction of the paper is insufficient, the paper is wrinkled, and conversely, when the vector force is too large, the paper is torn.

  Therefore, an object of the present invention is to provide a paper conveying apparatus that can solve the above-mentioned problems and can convey the paper while preventing it from wrinkling.

  According to a first characteristic configuration of the present invention, a conveyance driving roller is provided on one side across a paper conveyance surface that conveys paper, and a driven roller is provided on the other side across the paper conveyance surface. In the paper transport device configured to be able to transport paper by driving a roller, the transport drive roller and the driven roller respectively include a pair of roller bodies arranged at left and right positions on the paper transport surface. The pair of roller bodies in at least one of the transport driving roller and the driven roller is configured so that the direction perpendicular to the transport direction within the paper transport surface is a reference line, and the roller body with respect to the reference line The shaft core is configured such that the angle can be changed along the paper conveyance surface, and angle changing operation means for changing the angle of the shaft core of the roller body is provided.

According to the first characteristic configuration of the present invention, the angle changing operation means can change the pair of left and right roller bodies so that the angle of the roller body axis with respect to the reference line changes. .
That is, for example, when setting a pair of roller bodies so as to have a “C” -shaped posture with respect to the traveling direction on the surface along the paper conveyance surface, the angle of the roller body axis is changed. By increasing the angle of the axis of the roller body with respect to the reference line, the vector force spreading in the left-right direction acts on the paper greatly, or conversely, by reducing the angle, the vector force in the paper width direction Can be reduced, and the vector force in the transport direction can be increased and various controls can be performed.
As a result, for example, when transporting thin paper that is prone to wrinkles, the angle changing operation means can be used to change the angle between the reference line and the roller body axis so that the wrinkles are not easily shifted. When transporting thick paper, change the angle to reduce the angle to increase the vector force in the transport direction so that it can be transported efficiently, or to prevent wrinkles in the state of the target paper. The paper can be conveyed with the aim of the above.
Of course, the posture of the roller body can be set so that the axis of the roller body is perpendicular to the transport direction as in the conventional transport device.

  According to a second characteristic configuration of the present invention, the angle changing operation means is configured such that the angle of the pair of roller bodies can be changed to a line-symmetric state about a line along the conveying direction. is there.

  According to the second characteristic configuration of the present invention, in addition to achieving the above-described operational effects of the first characteristic configuration of the present invention, the paper to be transported is directed toward the intended paper transport direction. It becomes possible to convey more accurately.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

FIG. 1 shows a copying machine 1 in which an example of a paper conveying apparatus of the present invention (hereinafter simply referred to as a conveying apparatus T) is incorporated. The copying machine 1 is a copy source obtained by a scanning unit not shown in the figure. Based on this information, the paper 2 on the paper transport path R can be copied by performing various processes such as image transfer and printing.
3 in the figure is a paper storage unit for storing the paper 2, 4 in the figure is a copying unit for performing image transfer or printing on the paper 2, and 5 in the figure is a copy. The receiving part which receives the paper 2 is shown. As shown in the figure, the paper transport path R can be divided into R1, R2, R3, and R4 portions for convenience, and the first transport path R1, the second transport path R2, and the third transport path R3 are sequentially arranged. This is called a fourth transport route R4. And the said conveying apparatus T is provided in 3rd conveyance path | route R3.
Although not shown in the drawing, various rollers are installed throughout the paper transport path, and the paper 2 is transported along the paper transport path R by driving them.

In addition, regarding copying on paper, it is configured so that both single-sided printing for printing on one side of paper and double-sided printing for printing on both front and back sides of paper can be performed.
During the single-sided printing, the paper 2 is subjected to a copying process on the surface from the first transport path R1 through the second transport path R2, and then sent to the third transport path R3 to be discharged to the receiving unit 5. Is done.
That is, in single-sided printing, the order is R1 → R2 → R3.
During the duplex printing, the paper 2 is subjected to a copying process on the surface from the first transport path R1 through the second transport path R2, and then enters the third transport path R3, and then the transport device T Is switched back to enter the fourth transport path R4 from the rear end side. After that, the paper enters the second transport path R2 with the front / back and front / back sides of the paper being exchanged, and is subjected to a copying process on the back surface, passes through the third transport path R3, and is discharged to the receiving portion 5.
That is, in double-sided printing, the order is R1, R2, R3, R4, R2, and R3.

The transport device T will be described.
As shown in FIGS. 2 to 4, the transport device T is provided with a transport driving roller 7 on one side of the paper transport surface 6 with the transport direction set to be freely folded back and forth, and sandwiches the paper transport surface 6. A driven roller 8 is provided on the other side, and the paper 2 can be transported either forward or backward along the paper transport surface 6 by switching the driving direction of the transport drive roller 7 between forward and reverse. Each of the transport driving roller 7 and the driven roller 8 is provided with a pair of roller bodies 9 that are separately arranged at the left and right positions in the transport direction along the paper transport surface 6.

  A pair of roller bodies 9A constituting the transport driving roller 7 is fixed to a common rotating shaft 10 and is configured to be rotationally driven by a rotational driving mechanism (not shown).

The pair of roller bodies 9B constituting the driven roller 8 is configured so that the inner end portions 9Bb of the roller bodies 9B are located in front of the outer end portions 9Ba of the roller bodies 9B in the paper transport direction within the plane along the paper transport surface 6. Or, it is supported so as to be swingable so as to be located rearward (corresponding to the posture changing means S), and the driven roller 8 has a direction perpendicular to the transport direction in the paper transport surface 6 as a reference line K. Angle changing operation means Y is provided for changing the angle θ of the shaft core of both roller bodies 9B relative to the reference line K to the same value on the left and right.
Specifically, as shown in FIG. 3, the posture changing means S includes a bearing portion 11b of the inner end portion 9Bb of the pair of roller bodies 9B among the bearing portions 11 that pivotally support the pair of roller bodies 9B. However, by forming the elongated hole 12 along the paper conveying direction, the posture of the roller body 9B can be changed within the range of the elongated hole 12 around the bearing portion 11a of the outer end portion 9Ba of the pair of roller bodies 9B. It is configured so that it can.
Then, as shown in FIG. 4, the angle changing operation means Y can be arranged at any position along the longitudinal direction within the range of the long hole 12 with the shaft portion on the inner end portion 9Bb side of the pair of roller bodies 9B. An actuator 13 that is freely movable, an operation panel 14 that can specify the amount of movement of the shaft portion by the actuator 13, and a controller 15 that controls the movement of the actuator 13 so as to correspond to the amount of movement input from the operation panel 14. And is configured. Both the operation panel 14 and the control unit 15 are provided in a part of the operation panel and control unit of the copying machine 1.
An example of the input format on the operation panel 14 is, for example, a format in which the corresponding paper is selected and specified from selection items such as “thick” and “thin”. In accordance with the designation, a control signal is given from the control unit 15 to the actuator 13. As an example of the control, for example, when the paper designation is “thick”, the actuator 13 is driven so that the angle θ becomes θa degrees as shown in FIG. Is “thin”, as shown in FIG. 5B, the actuator 13 may be driven so that the angle θ becomes θb degrees larger than θa degrees. By such an angle adjustment, in the case of “thin” paper that tends to wrinkle, it is possible to increase the angle θ and increase the force to spread in the paper width direction.
Further, in the control unit 15, when the transport direction of the paper 2 is switched back, the angle θ is set to −θa instead of θa, and is set to −θb instead of θb, and also supports reverse paper transport. It is configured to be able to.
Therefore, it is possible to prevent wrinkles from being caused regardless of whether the paper 2 travels forward or backward.

[Another embodiment]
Other embodiments will be described below.

<1> The paper transport device T is not limited to the one built in the copying machine described in the previous embodiment. For example, the paper transport device T is used for a device that transports paper in the front-rear direction, such as a facsimile or a printer. Is possible. In addition, although it is expressed as paper for the sake of convenience, it may be a synthetic resin sheet or film, cloth, paper, cloth or a synthetic resin laminate, etc. Collectively called paper.
<2> The angle changing operation means Y is not limited to that provided in the driven roller 8 described in the previous embodiment, and may be provided in the transport driving roller 7, for example.
Further, the selection item for the angle change by the angle change operation means Y is not limited to the paper thickness described in the previous embodiment. For example, the difference in paper size and the moisture content of the paper It may be a difference or the like. In this case, it is preferable to perform the changing operation so that the angle θ is increased as the size of the paper is larger or the moisture content of the paper is larger. In addition, instead of the format input by human power, for example, a detection means for automatically measuring the thickness (or size, moisture content, etc.) of the paper 2 is provided, and the control is performed based on the detection value by the detection means. It is also possible for the unit to automatically adjust the angle θ.
In addition, various types of actuators can be employed, such as a roller structure that adjusts the roller angle with a cylinder structure, a motor drive, and a manual angle change adjustment.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Schematic diagram in front view of the copier showing the paper transport path in the copier Cross-sectional view of the paper conveyance device as viewed in the direction of paper conveyance Exploded perspective view showing driven roller Explanatory drawing on the back side of the paper showing the action of the angle change operation means Explanatory drawing on the back side of the paper showing the action of the angle change operation means Explanatory drawing on the front side of the paper showing the installation status of conventional transport drive rollers

Explanation of symbols

2 paper 6 paper transport surface 7 transport drive roller 8 driven roller 9 roller body K reference line Y angle change operation means

Claims (2)

A conveyance drive roller is provided on one side of the paper conveyance surface that conveys the paper, and a driven roller is provided on the other side of the paper conveyance surface. The paper can be conveyed by driving the conveyance drive roller. A paper conveying device configured in
The transport driving roller and the driven roller are each provided with a pair of roller bodies separately arranged at the left and right positions on the paper transport surface, and at least one of the transport driving roller and the driven roller The pair of roller bodies is configured so that the axis of the roller body with respect to the reference line can be changed in angle along the paper transport surface, with a direction perpendicular to the transport direction in the paper transport surface as a reference line. A paper conveying apparatus provided with angle changing operation means for changing the angle of the axis of the roller body.   The paper conveying apparatus according to claim 1, wherein the angle changing operation unit is configured so that the pair of roller bodies can change the angle to a line-symmetric state with a line along a conveying direction as a center.

Images