JPH047232A - Medium delivering method and device therefor - Google Patents

Abstract

PURPOSE:To surely deliver only a single sheet of paper by rotating a reversing roller at a rotational speed slower than a pickup roller in a reverse direction thereto and repeating a cycle of stopping and rotating the pickup roller in the case of delivering the paper. CONSTITUTION:A separator 12 for separating a medium and a reversing roller 15, which can be rotated at a speed slower than that of a pickup roller 11 in an opposite direction thereto, are attached to the pickup roller 11 rotatable in a direction of delivering the medium 14. Next, rotation of the pickup roller 11 is stopped when the medium 14 is advanced to pass through a contact point 16 between the pickup roller 11 and the reversing roller 15. The medium 14 is retracted beyond this contact point 16 only by rotating this reversing roller 15, and then only a single sheet of the medium 14 is delivered by rotating the pickup roller 11 in the direction of delivering the medium 14.

Description

[Detailed Description of the Invention] [Summary] A method and apparatus for feeding out a medium, for example, when feeding out paper (medium) such as a cut sheet using a separator.
Regarding a method for preventing multiple sheets of paper from being fed out, and a device that implements such a method, when using a media feeding device, it is possible to prevent multi-feeding of multiple sheets of paper and to feed one sheet at a time. In order to provide a reliable method for feeding out the medium, a big unroller that can rotate in the direction in which the medium is fed out has a separator for separating the medium and a pickup roller that rotates in the opposite direction at a slower speed than the pickup roller. When the media is advanced past the point of contact between the pickup roller and the reversing roller, the rotation of the pickup roller is stopped and the media is retracted past the contact point only by the rotation of the reversing roller, and then the media is advanced past the point of contact between the pickup roller and the reversing roller, and then the media is advanced past the point of contact between the pickup roller and the reversing roller. A medium feeding method characterized in that a roller is rotated in a feeding direction of the medium to feed out only one sheet of the medium, and a pickup roller is arranged above a separator that separates the medium, and a separator is placed below the pickup roller. Additionally, a reversing roller having a diameter smaller than that of the pickup roller that comes into contact with the pickup roller is provided, and a medium feeding device is configured such that the medium is fed out through a contact point between the pickup roller and the reversing roller.

[Industrial Application Field] The present invention provides a method and apparatus for feeding out a medium, for example, a method for feeding out a large number of sheets of paper (medium) such as a cut sheet when a separator is used to feed out a large number of sheets of paper (medium) such as cut sheets. The present invention relates to a method for preventing and an apparatus for carrying out such a method.

[Prior Art] Conventionally, a device shown in the front view of FIG. 3 has been used to feed out a medium such as a cant sheet, and in the figure, reference numeral 11 rotates in the direction of the arrow, that is, in the direction of feeding out the paper. pickup roller, 12 is a separator, 13 is separator 12
14 is a medium (paper), and a plate of urethane rubber, for example, is attached to the surface of the separator 12. This device utilizes the fact that the friction coefficient of the pickup roller, the friction coefficient of the urethane rubber, and the friction coefficient of the paper 14 are different, and the balance of these exerts a braking effect on the paper to feed out one paper at a time. It is designed as such.

[Problems to be Solved by the Invention] In the above-described medium feeding method, the pickup roller 11
The sheets are separated only by the difference in the coefficient of friction between the separator 12 and the paper 14, and a large number of two or more sheets may be fed out at a rate of one out of thousands of sheets. When a large number of sheets of paper enter between the separator 12 and the pickup roller 11 during continuous use of the medium feeding device, the brake action between the pickup roller 11 and the separator 12 stops working, and double feeding of sheets occurs. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method that prevents multiple sheets of paper from being fed multiple times and reliably feeds out sheets one by one when using a medium feeding device.

[Failure to solve the problem]

To solve the above problem, a reversing roller that can rotate at a slower speed than the pink-up roller in the opposite direction to the separator for separating the media and the pink-up roller is brought into contact with a pickup roller that can rotate in the direction in which the medium is fed out, and the medium is picked up. Once the media is advanced past the contact point between the roller and the reversing roller, the rotation of the pickup roller is stopped, the media is retracted past the contact point by only the rotation of the reversing roller, and the pickup roller is then rotated in the direction of media delivery to remove the media. A medium feeding method characterized by feeding out only one sheet,
A pink-up roller is arranged above the separator that separates the medium, and a reversing roller having a smaller diameter than the pickup roller that contacts the pink-up roller together with the separator is provided below the pickup roller. The solution is to provide a media feeder configured to feed through contact with a reversing roller.

[Operation] In other words, the present invention advances the medium by a predetermined distance even after passing the contact point between the pickup roller and the separator, regardless of whether there is one medium or many sheets overlapped, and the rotation of the pink-up roller is stopped. stop, retract the media past the contact point with a reversing roller rotating at a slower speed than the rotation of the pink-up roller, and then rotate the big-up roller. When there is only one medium, it is advanced; when there are many media, only the top one of the many media is advanced, and the second and subsequent media are held by the reversing roller, so the media This means that only one card is always played out.

〔Example] Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

The apparatus shown in FIG. 1 is used to carry out the method of the invention. In FIG. 1, the same parts as those shown in FIG. 3 are designated by the same reference numerals, and 15 is a reversing roller.

In this device, a separator 12 is attached to a pickup roller 11 that rotates in a normal feeding direction (arrow direction).
and the reversing roller 15 that rotates in the opposite direction to the pickup roller 11, that is, in the direction that returns the paper.
It's pressed against me. In the normal case, i.e. paper 14
When there is only one sheet of paper 14, the paper 14 is fed out only by the brake action of the separator 12, but when many sheets of paper 14 are fed out by the separator 12,
If the paper enters the paper, the separator 12 alone cannot separate the paper, so the reversing roller 15 is used to feed out only one paper.

Fig. 2 shows the principle of the present invention; Fig. 2 (a) is a diagram when there is one sheet of paper, and Fig. 2 (b) is a diagram when there are two sheets. is not shown.

Referring to FIG. 2(a), the pickup roller 11 rotates in the direction of the arrow at a rotational speed that is in the normal feeding direction, and the reversing roller 15 rotates in the direction of the arrow at a rotational speed as low as, for example, 1/4 of the rotational speed of the pickup roller 11. In other words, the pickup roller 11 is rotating in the opposite direction. When one sheet of paper 14 passes a contact point 16 between the pickup roller 11 and the reversing roller 15 and travels a certain distance to the position indicated by the broken line, the rotation of the pickup roller 11 is stopped. Since the reversing roller 15 is rotating at the slow speed described above, the paper 14 passes over the contact point 16 and returns to the position shown in the figure. When the pickup roller 11 is rotated at the normal rotational speed in the direction of the arrow, its rotational force overcomes the rotational force of the reversing roller 15 and the paper 14 is fed out in the direction of the arrow (2).

Next, referring to FIG. 2(b), as described above, the pickup roller makes a normal rotational movement in the direction of the arrow, and the paper 14 is moved to the point where the reversing roller 15 is rotating in the direction of the arrow at the slow speed described above. Suppose that two pieces of are received. At this time, as in the previous example, two sheets of paper 14 are connected to contact 1.
6 and is sent to the position shown by the broken line. At this point, when the rotation of the pickup roller 11 is stopped, the upper paper 1
4 is in contact with the pickup roller 11, and the reversing roller 15
is in contact with the lower paper 14, so the lower paper 14 goes first and the two papers retreat to the position shown by the solid line in the figure. Next, the pickup roller 11 is rotated in the direction of the arrow at a normal rotation speed. At this time as well, the reversing roller 15 is rotating at a slow speed in the direction of the arrow, so the upper paper 14 is fed out in the direction of the arrow 1, while the lower paper 14 remains stopped by the reversing roller 15. As a result, only one sheet of paper 14 is fed out.

When there are three or more sheets of paper 14, in the same way, only the top paper is fed out first, then the second and subsequent sheets are held in place, and after the top paper is fed out, the above operation is repeated to unwind the paper. are surely paid out one by one.

The cycle of rotation → stop → rotation of the pickup roller described above can be controlled by using a personal computer (or by incorporating a step means into the drive source of the pickup roller 11, the cycle described above can be executed automatically with the number of steps). It may be repeated.

In the example described above, the reversing roller 15 is constantly rotating in the opposite direction at a rotation speed of 174 times the rotation speed of the pickup roller 11, but its rotation speed is not limited to this example, and is 175 times the rotation speed of the big amplifier roller. The rotational speed ratio can be set appropriately depending on the size of both rollers.

Further, the diameter of the reversing roller 15 is set to be smaller than the diameter of the pickup roller 11, but its size is also set appropriately.

〔Effect of the invention〕

As described above, according to the present invention, in the medium separation, a reversing roller smaller than the pickup roller is arranged opposite to the pickup roller, and the reversing roller rotates at a slower rotation speed than the pickup roller and in a direction opposite to the pickup roller. When the pickup roller was rotated to 100 degrees, and when the paper was fed out, the cycle of stopping the pickup roller and rotating it was repeated, thereby achieving the effect that only one sheet of paper was fed out reliably.

11 is a pickup roller; 12 is a separator; 13 is a pressure spring; 14 is paper; 15 is a reversing roller; 16 is a contact shows.

[Brief explanation of the drawing]

Figure 1 is a diagram of an embodiment of the present invention; Figure (a) is a front view, Figure (b) is a side view, Figure 2 is a diagram showing the principle of the present invention, and Figure (a) is a paper sheet. Figure (b) is a diagram when there is one sheet of paper, Figure (b) is a diagram when there are two sheets, and Part 3 is a front view of a conventional example. Patent applicant Fujitsu Kiden Co., Ltd.

Claims (2)

[Claims] (1) A separator (1
2) and a reversing roller (15) that can rotate in the opposite direction to the pickup roller (11) at a slower speed than the pickup roller (11), so that the medium (14) is rotated between the pickup roller (11) and the reversing roller (11). 15), the pickup roller (11) stops rotating and the medium (14) is retracted past the contact (16) only by the rotation of the reversing roller (15), and then A medium feeding method characterized by rotating a pickup roller (11) in a medium feeding direction to feed out only one medium (14). (2) A pickup roller (11) is arranged above the separator (12) that separates the medium (14), and a separator (11) is arranged below the pickup roller (11).
12) and a reversing roller (15) having a smaller diameter than the pickup roller (11) that comes into contact with the pickup roller (11), and the medium (14) is the contact point between the pickup roller (11) and the reversing roller (15). A media feeding device configured to feed through.