JPS6242819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device, and more particularly, to an improvement in a paper feeding device for sequentially feeding roll paper as copy paper for a copying machine.

Prior Art In order to feed roll paper, the roll paper is arranged around a rotatable shaft, and the leading end of the roll paper is pulled by a conveying means, so that the shaft rotates while the roll paper is being pulled. A paper feeding device is used in which roll paper is unraveled and fed in sequence. That is, as shown in FIG.
The roll paper is supported on both sides by flanges 2, placed in the groove 7 of the receiving member 8 via bearings 6 fitted to both ends of the shaft 5, and then tightened with the nut 1.
0 to prevent the bearing 6 from coming off. At the same time, a spring 12 is pivotally connected to the receiving member 8 via the pivot point 14 and has one end fixed to the receiving member 8.
The plate member 11, which is urged toward the axis of the roll paper by being connected to the other end, presses the bearing 6 to prevent the roll paper 1 from falling or floating from the support member 8. Do it like this. Thus, the leading end of the roll paper 1 is passed between a feed roll 3 and a pinch roll 4, which serve as transport means, to feed the paper. That is, the pinch roll 4 presses the paper against the feed roll 3 with a constant pressure, and when the feed roll 3 rotates, the paper held between these rolls is pulled, so that the roll paper 1 is sequentially fed while the shaft 5 rotates. Ru.

Now, using such a paper feeding device, a predetermined amount of paper is fed to the conveying means (in the case shown in the figure, the roll 3,
When 4) is stopped, the roll paper continues to rotate due to inertia even after the stop, and loose paper is created between the roll paper and the conveyance means. As a result, when paper feeding is restarted next time, the rolled paper is fed in a meandering manner to the left and right or is biased in one direction, which may cause cutting errors or paper jams. Therefore, in conventional devices, the first
As shown in the figure, the brake device 9 biased by the spring member 12 presses the roll paper 1 and applies back tension (tension in the opposite direction to the feeding direction) to the paper due to frictional resistance. This prevents the paper from loosening.

However, the weight of the roll paper changes depending on the size of the paper and the remaining amount used, the frictional resistance changes depending on the type of paper such as plain paper and tracing paper, and furthermore, the roll paper diameter changes, etc. In reality, it is not possible to completely control the relaxation of the paper due to the spring pressure changing due to the change in the spring pressure, and the above-mentioned troubles occur to a greater or lesser extent, significantly reducing the stability of the machine.

Furthermore, when using a brake device like the one shown in Figure 1, the roll paper and the brake unit rub against each other with strong force, which compresses the paper surface and causes paper dust and denaturation of the fiber surface (paper surface). When the roll paper is used as a copy paper, the development transfer efficiency may decrease in some areas, leading to problems such as copy defects (missing copies, etc.).

Purpose of the Invention Therefore, the present invention solves the above-mentioned problems, and provides a roll paper feeding device that can feed paper stably and that does not cause deterioration of the paper during feeding. The purpose is to provide the following.

Structure of the Invention The present invention achieves the above object by reversing the shaft on which the roll paper is disposed when the paper feed is stopped. Thus, according to the present invention, the ends of the roll paper disposed around the rotatable shaft are pulled by the conveying means, so that the roll paper is sequentially fed while the shaft rotates. A paper feeding device according to the present invention, further comprising a driving means that does not engage with the shaft while the transporting means is in operation and rotates the shaft in reverse when the transporting means stops. is provided.

In the paper feeding device of the present invention, when paper feeding is stopped, the rotation of the shaft on which the paper is attached is reversed without pressing the roll paper, thereby preventing the paper from loosening. In order to further clarify the configuration and effects of the present invention, the present invention will be further described below with reference to embodiments shown in the drawings.

Embodiment FIGS. 2 and 3 show an embodiment of the roll paper feeder of the present invention.

In the figure, the manner in which the roll paper 1 is arranged on the shaft 5, the function of the plate member 11, the mode of paper feeding by the rollers 3 and 4, etc. are basically the same as those described above in connection with FIG. It is. Therefore, in FIGS. 2 and 3, members having the same configuration and function as those in FIG. 1 are designated by the same numbers as in FIG. 1, and the explanation thereof will be omitted.

However, in the paper feeding device of the present invention as illustrated in FIGS. 2 and 3, the roll 20 is fixed to the shaft 5, and the roll is attached by the nut 10 together with the bearing 6 so that it does not come off the shaft 5. This differs from the conventional paper feeding device shown in FIG. 1 in that the paper feeding device shown in FIG. Furthermore, in the device of the present invention, the motor 2
A wheel 22 is fitted onto the rotating shaft 24 of No. 3 and fixed by a nut 21, and the wheel 22 is arranged so as to be in contact with the roller 20. During paper feeding, the motor 23 is not energized, and the wheel 22 contacts the roll 20 and rotates idly relative to the motor 23 in the same direction as the rotation direction of the roll.

Thus, the feed roll 3 is controlled by the external signal.
When is driven, as described above, the shaft 5 rotates with the plate member 11 holding down the bearing 6, and the roll paper 1 is sequentially loosened and fed while passing between the rolls 3 and 4. . At this time, as described above, the wheel 22 rotates in the same direction as the roll 20 and does not interfere with the rotation of the shaft 5. Therefore, when the conveying means, that is, the rolls stop, the shaft 5
further rotates due to inertial force, and the roll paper 1 is about to be sent out. However, if the motor 23 is energized and rotated for a certain period of time at the same time as or slightly delayed from this paper feed stop signal, and thereby the shaft 5 is reversed via the wheel 22 and the roll 20, the roll paper 1 is In reverse, it absorbs the slackness of the paper and winds it into the roll paper.

Effects of the Invention As can be understood from the above description, in the roll paper feeding device of the present invention, by reversing the feeding direction of the roll paper when paper feeding is stopped, the paper size, paper quality, or roll paper quality can be changed. Regardless of the amount of remaining paper (the diameter of the rolled paper), excessive paper feeding due to inertial force when paper feeding is stopped is prevented. Thus, by using the apparatus of the present invention, when the conveying means is stopped, there will be no loose paper between the conveying means and the roll paper, so when paper feeding is resumed, the paper will not be skewed (skewed). The paper is fed in a predetermined direction without wobbling or meandering, and therefore does not cause problems such as paper jams. Furthermore, since the roll paper itself is not compressed with strong force, the properties of the paper do not change, and therefore, when the paper feeding device of the present invention is used in a copying machine, copy defect as described above will not occur. Nor.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a typical example of a conventional roll paper feeding device. 2 and 3 are a partially exploded perspective view and a side sectional view, respectively, showing one embodiment of the roll paper feeding device of the present invention. 1... Roll paper, 2... Flange, 3... Feed roll, 4... Pinch roll, 5... Rotating shaft, 20... Brake roll, 22... Wheel, 23... Motor.

Claims (1)

[Claims] 1. A paper feeding device in which an end of a roll paper disposed around a rotatable shaft is pulled by a conveying means so that the roll paper is sequentially fed while the shaft rotates. A sheet feeding device characterized in that a drive means is provided that does not engage with the shaft while the transport means is in operation, but rotates the shaft in reverse when the transport means stops.