JPH02249854A - Conveying mechanism of recording medium sheet - Google Patents

Abstract

PURPOSE:To correct the skew of paper automatically by adjusting the extent of braking force of a pinch roller on one side according to the skew value detected by a sensor. CONSTITUTION:A friction plate 34 is attached to the side end of a guide member 44 of a pinch roller 16 on one side of two pinch rollers 14, 16 and another friction plate 32 to a slider 30 as opposed to the former, respectively. This slider 30 is made slidable to a guide rod 24. In addition, another slider 26 is guided by a guide member 48, while a coil spring 28 is set up in space between these sliders 30 and 26. When a sheet 10 being held between the pinch rollers 14, 16 and a driving roller 12 and conveyed in a Y direction is detected of its skew by sensors 18, 20, a motor 38 is rotated by a motor drive circuit 46, and the slider 26 is moved by an eccentric cam 42, thus the slider 3 is moved via a spring 28. Then, these friction plates 32, 34 are frictionally engaged together, and the pinch roller 16 is therefore braked. Braking force is made adjustable through an amount of skew value.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a mechanism for conveying a recording medium paper using a capstan roller system, and in particular to a mechanism that can automatically adjust the skew of the conveyed paper. A recording medium paper conveyance mechanism that conveys the recording medium paper while being held between a drive roller and a plurality of pinch rollers, with the purpose of providing a recording medium paper conveyance mechanism that can automatically correct skew feeding. A sensor for detecting the skew amount of the recording medium sheet and at least one pinch roller among the plurality of pinch rollers can be braked, and the braking force can be adjusted. The variable braking device is configured to include a variable braking device capable of controlling the variable braking device, and a braking force adjustment device that adjusts the braking force of the variable braking device according to the amount of skew detected by the sensor.

[Industrial application field]

The present invention relates to a mechanism for conveying a recording medium sheet using a capsun roller system, and more particularly to a mechanism that can automatically adjust the skew of the conveyed sheet. Therefore, this mechanism can be used as a transport mechanism for recording medium paper in passbook printers used in banks and the like.

[Conventional technology]

In order to record a passbook at a bank or the like and to leave a copy on the bank side, thin paper is conveyed and recorded by a recording medium paper conveyance mechanism using a cab scan roller system. in this case,
Although the recording medium is conveyed along a medium guide that guides the recording medium, since the recording medium is thin paper, the effect of forcibly correcting the skew of the recording medium by the medium guide does not work sufficiently.
A sensor is provided to detect the amount of skew, and if the amount of skew is large, it is necessary for the operator to repeat the general feeding as many times as necessary manually.

Methods for correcting this skew of the recording medium include adopting a tapered roller as the pinch roller, manually adjusting the inclination of the pinch roller so that the medium is conveyed along the medium guide, and The pressure of the rollers had to be adjusted manually.

[Problem to be solved by the invention]

However, because the recording medium is thin paper, it is difficult for the media guide to fully demonstrate its function, and manually adjusting the tilt and pressure requires a lot of work time and the adjustment itself is difficult. was often difficult.

Therefore, in order to solve this problem, the present invention aims to provide a recording medium sheet conveyance mechanism that can automatically correct the skew of the recording medium.

[Means to solve the problem]

In view of the above object, the present invention provides a recording medium sheet conveying mechanism that conveys the recording medium sheet while being held between a drive roller and a plurality of pinch rollers, and detects the amount of skew of the recording medium sheet. a variable braking device capable of braking at least one pinch roller of the plurality of pinch rollers and adjusting the braking force; The present invention provides a recording medium sheet conveyance mechanism comprising a braking force adjusting device that adjusts the braking force of the variable braking device according to the line amount.

[For production]

The sensor detects the amount of skew of the recording medium sheet, and the braking force adjustment device acts on the variable braking device according to the detected amount to correct the skew by adjusting the braking force of the pinch roller.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. Referring to FIG. 1, a recording medium paper 10 such as a slip has a driving roller 12 and two pinch rollers]4.
- 16 and transported in the Y direction in the figure. Therefore, a guide member 44 having a wall surface parallel to the Y direction is provided, but since the recording medium paper 10 is usually thin paper, the guide member 44 often cannot fully fulfill its guiding function. The recording medium paper 10 may be skewed with respect to the Y direction due to the unbalance of the two pinch rollers 14 and 16. In order to detect this skew, two sensors 18 and 20 are arranged in parallel in a direction perpendicular to direction Y. In the present invention, the following device is used to correct the skew of the recording medium paper 10.

A friction plate 34 is attached to the end of one pinch roller 16 on the guide member 44 side of the two pinch rollers 14 and 16 mentioned above, and another friction plate 32 is disposed opposite to this. The other friction plate 32 is attached to a slider 30, and the slider 30 is formed of a spline shaft, for example, which is provided protrudingly from the fixed member 22 integrated with the frame and is generally concentric with the pinch roller 16. It is slidable relative to the guide rod 24. Further, another slider 26 is arranged to be guided by a guide member 48 for the slider 26, and a biasing force is applied between the front end of the slider 26 and the rear end of the slider 30 in the direction of extension. A coil spring 28 is provided. Furthermore, the slider 30 and the guide member 48 are provided with a spring member 3 having a smaller tensile force than the biasing force of the coil spring 28.
6 each end is attached. However, the guide member 48
Instead, one end may be attached to another fixing member.

An eccentric cam 42 is in contact with the rear end of the slider 26, and the eccentric cam 42 is connected to a motor 38 such as a step motor.
is fixed to the output shaft 40 of.

This motor 38 detects the amount of skew of the recording medium paper 10 according to the detection signals of the sensors 18 and 20 described above, and a motor drive circuit 4 controls the motor 38 according to the amount of skew.
6 to rotate the angle appropriately. As a result, the eccentric cam 42 changes the circumferential position where it contacts the rear end of the slider 26, slides the slider 30 forward via the coil spring 28, and presses the friction plates 32 and 34 against each other, or The coil spring 28 is fully extended to reduce its biasing force, and the slider 30 is pulled by the tensile force of the spring member 36, thereby separating the two friction plates 32 and 34. In this way, depending on the rotation angle of the eccentric cam 42, the spring 28.
36 can be continuously changed, the frictional force between the two friction plates 32 and 34 is adjusted, and therefore the rotation of the pinch roller 16 is adjusted, thereby preventing the skew of the recording medium 1G. will be corrected.

In the above embodiment, only one of the two pinch rollers 14 and 16 is adjusted, so if the pinch roller 16 is allowed to rotate completely, the resistance of the pinch roller 160 rotations is greater than the resistance of the pinch roller 160 rotations. It is necessary to initialize both pinch rollers so that the rotational resistance of the other pinch roller 14 is greater.

In this way, no matter which direction the recording medium sheet 10 is skewed, the skew can be corrected by simply adjusting the rotation of the pinch roller 16. It is clear that in addition to this method, a method in which both pinch rollers are adjusted may also be used. Further, the number of pinch rollers is not limited to two, but three or more may be used, and the above method can also be adopted in this case.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to provide a conveyance mechanism that can automatically correct the skew of recording medium paper, and therefore, it is possible to re-feed the paper and change the pinch roller. Work time for adjustments, etc. can be greatly reduced.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a conveyance mechanism according to the present invention. 10...Recording medium paper, 14.16...Pinch roller, 18.20...Sensor, 26...Slider 28...Coil spring (for compression), 32...Friction plate, 36 ... Spring member (for tension), 38 ... Motor, 42 ... Eccentric cam, 4
6...Motor drive circuit.

Claims (1)

[Scope of Claims] 1. A recording medium sheet conveyance mechanism that conveys a recording medium sheet (10) while being held between a drive roller (12) and a plurality of pinch rollers (14, 16), comprising: A sensor (18, 20) that detects the amount of skew of the recording medium paper (10) and at least one pinch roller (16) among the plurality of pinch rollers (14, 16) are braked. a variable braking device (28, 32) capable of adjusting its braking force; and the sensor (18, 20).
) according to the amount of skew detected by the variable braking device (28,
Braking force adjustment device (26, 38) that adjusts the braking force of 32)
, 42). 2. A friction plate (32) that the variable braking device presses against the at least one pinch roller; and the friction plate (32).
2. The recording medium paper transport mechanism according to claim 1, further comprising a spring device (28, 36) capable of pressing and separating the pinch rollers. 3. The braking force adjustment device includes a motor (38), an eccentric cam (42) attached to the output shaft (40) of the motor, one end of which is in contact with the cam, and the other end of which is connected to a pressing spring (of the spring device). 28), and a motor drive circuit (46) that supplies a drive current to the motor according to the amount of skew detected by the sensor (18, 20). Item 1. The recording medium sheet conveyance mechanism according to item 1.