JPH0416110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roll paper cutting device for a copying machine, and more particularly, the present invention relates to a roll paper cutting device for a copying machine, and in particular, it is equipped with a fixed blade and a rotary blade, and curves the roll paper into a loop shape at the cutting position. The present invention relates to a roll paper cutting device that cuts roll paper into a predetermined length by rotation.

2. Description of the Related Art Copying machines that use roll paper as recording paper and are equipped with a roll paper cutting device having a rotary blade and a fixed blade for cutting the roll paper into predetermined lengths are known. A typical configuration of such a copying machine is schematically shown in FIG. 1, and its cutting device is shown in FIG. 2.

1 and 2, a latent image formed on a photosensitive drum 1 is developed into a toner image by a developing device 2, and this toner image is transferred to a transfer corona discharger 3.
is transferred to a recording sheet cut from the roll paper 4. The roll paper 4 is sent to the cutting device 6 by the first feeding rollers 5, 5, and then the second
The cutting device 6 operates to cut the roll paper so that it is sent to the feeding rollers 7 and 7 to form a recording paper of a predetermined length. The cutting device 6 consists of a fixed blade 8 and a rotary blade 9, and the rotary blade cuts the image plane (i.e., the front side) of the recording paper.
It is arranged on the back side of the roll paper to protect the roll paper and is rotated by the motor 10, and as it rotates, it engages with the fixed blade 8 and cuts the roll paper. The second feeding roller 7 is the photosensitive drum 1
The paper is fed to a transfer position where a transfer corona discharger 3 is provided at a speed synchronized with the transfer position, and the paper after transfer is directed to a fixing device 12 by third feeding rollers 11, 11, and then discharged to an output tray 13. Ru.

In general, roll paper has curls (hereinafter referred to as curls in this book), and if it is sent to the photoreceptor drum in a curled state in the opposite direction to the curvature of the drum, poor transfer may occur, especially cutting. Since transfer defects such as image dropouts are noticeable at the leading and trailing edges of the subsequent sheet, the sheet must be fed so that its curl is in the same direction as the curvature of the photoreceptor drum. Therefore, the leading end of the roll paper is curled away from the rotary blade 7, and in this state it becomes difficult to feed it to the narrow entrance of the second feeding roller 7. In addition, at the cutting position for cutting the roll paper, the roll paper is curved into a loop shape and the first feeding roller 5 and the second
The difference in paper feeding speed with the feeding roller 7 must be compensated for, which further impedes smooth feeding of the paper.

This loop formation will be explained using FIGS. 1 to 3. As described above, the paper feeding speed of the second feeding roller 7 is determined to be synchronized with the circumferential speed of the photosensitive drum 1, whereas the first feeding roller 5 has no such restriction. However, the first feeding roller 7 is not able to cut the paper during the transfer operation when the second feeding roller 7 is feeding the paper.
If there is no slack or slack in the paper between the first and second feeding rollers, the paper will be torn. Therefore, a loop 14 (solid line in FIG. 3) is formed on the paper 4 at the cutting position, thereby compensating for the difference in feeding speed between the first feeding roller 5 and the second feeding roller 7.

This loop 14 is formed by using the rotation space 15 of the rotary blade 9, but as mentioned above, the rotary blade 9 is located on the back side of the roll paper, and the rotation direction is opposite to the curling direction of the roll paper. It is curved in the direction.
For this reason, since reducing the size of the loop 14 may cause wrinkles to form on the paper, the space for forming the loop must also be increased, and the free end of the leading edge of the paper may be Entrance guide 1
6 increases, the leading edge of the paper becomes more likely to come off the paper feed path, and the corner A in FIG.
The area marked B has been more prone to paper jams.

In order to eliminate this problem, some extensions 17 are provided on the loop side plate of the entrance guide 16, as shown in FIG. 3, to guide the leading edge of the paper 4' as shown by the broken line. For example, if the diameter of the roll paper becomes small and the curl is strong, the leading edge of the roll paper will get stuck and there will be no fundamental solution, and the size of the loop 14 for the extension part 17 will be limited. , it was not preferable in this respect as well. Therefore, this extension part 17 is pivoted to the guide 16, and is positioned within the locus of the rotary blade during conveyance to reliably guide the leading edge of the roll paper to the guide 16. After guiding the leading edge, the extension part is removed. A device that pivots in the opposite direction has also been proposed. Although this device is desirable in terms of its functionality, it has disadvantages in that it becomes complicated, occupies more space, and requires a control device.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a roll paper cutting device for a copying machine that can reliably guide and properly cut the leading edge of a roll paper with a simple configuration.

Structure of the Invention In order to achieve the above object, in the roll paper cutting device according to the present invention, one end of the guide member made of a flexible and tough thin sheet material is located near the cutting position and in the rotation space of the rotary blade. The other end of the guide member is a free end extending toward the inlet of the second feeder, so that the leading edge of the cut paper roll is securely attached to the second feeder. In addition to being fed, the guide member does not interfere with the rotation of the rotary blade and the formation of loops in the paper.

Embodiments Examples of the present invention will be described below with reference to the drawings. In FIG. 5, parts of the copying machine other than the roll paper cutting device are omitted for convenience of explanation. Therefore, please refer to Figures 1 to 4 as necessary.
Please refer to the figure. As shown in FIG. 5, in the present invention, a guide member 20 made of a flexible and tough thin sheet material such as polyethylene glycol terephthalate known as Mylar (registered trademark) is attached to the leading end of the roll paper 4. is used to guide the feed rollers 7 to the second feeding rollers 7, 7. One end of this guide member 20 is fixed to a bracket 21, and this bracket 21 is fixed to a position near the cutting position and outside the rotation space 15 of the rotary blade 9, for example, to the upper end of the fixed blade 8. Of course bracket 2
1 may be provided not at the upper end of the fixed blade 8 but at other parts of the copying machine, in short, near the cutting position and at the rotary blade 9.
It suffices if it is installed outside the rotating space. The other end of the guide member 20 is a free end, and this end may extend any length as long as it guides the leading end of the roll paper 4 to the entrance of the second feed roller 7. It is preferable to extend it to the immediate vicinity, so that
The inner upper plate of the pair of plates constituting the guide 16 shown in FIG. 3 can be made unnecessary. Further, the guide member 20 may be a thin, wide film sheet, or may be formed in the shape of a short fence as shown in FIG. 5a, thereby increasing the flexibility of the member 20.
Furthermore, when forming a short fence like this, the tip can be reliably fed by guiding the parts corresponding to corners A and B shown in Fig. 4, so only the parts corresponding to the corners are extended. It's okay. Also, as shown in Figure 5a, the distance between each short fence is set to the width of the various roll paper (A3, A1 in the example shown).
It may be made to correspond to

By providing the guide member 20 in this way,
The leading edge of the roll paper 4 is gradually sent to the second feed roller 7 while being in contact with the guide member 20 and receives the soft pressing force of the guide member 20, and after being received by the second feed roller 7, it is transferred to the second feed roller 7. 1. A loop 14 (FIG. 3) is gradually formed due to the speed difference with the feeding roller 5 (FIG. 1). This loop 14 pushes up the guide member 20 as it is because the guide member 20 is flexible, and does not pose any obstacle to the formation of the large loop 14. Furthermore, even when the rotary blade 9 rotates during cutting, the guide member 20 is flexible. Therefore, the rotation is not obstructed.

As described above, the extension of the guide member 20 is made of a flexible material so as not to interfere with the formation of the loop of the roll paper and the rotation of the rotary blade. Rather, it is preferable to make the space between the rotary blades 9 and 16 as narrow as possible, as shown in the figure, in order to guide the leading edge of the roll paper.

6 and 6a show another embodiment, in which two short rail-like guide members 23, 24 are fixed to the bracket 22. FIG. One guide member 23 is made considerably more flexible than the other guide member 24, and in order to ensure reliable guidance of the leading edge of the roll paper, the rotation space of the rotary blade 9 is further expanded than the guide member 20 of FIG. 15 to narrow the gap between it and the rotary blade 9. The other guide member 24
The guide member 23 is made slightly more rigid than the guide member 23, and extends slightly longer than the guide member 23 so as to be located near the outside of the rotation space 15, and the tip exiting the guide member 23 is guided to the second feeding roller 7. We will assist you in doing so. In addition, this guide member 24 is used when guiding the curled end of the roll paper when it is hard.
It also serves as a supplement to step 3. Of course, the guide member 23 is sufficiently flexible so that it does not interfere with the formation of the loop and the rotation of the rotary blade 9. In this embodiment as well, each guide member 23, 24 may be a single film sheet, but may also be formed in the shape of a short fence as shown in the figure.

Effects of the Invention According to the present invention, the tip of the roll paper can be reliably fed to the second feeder downstream of the cutting device with a simple configuration that only includes a guide member made of a thin sheet material, and the thin sheet Since it is a material, not only the rotation of the rotary blade but also the formation of the loop is not hindered in any way, and therefore no space or device is required for controlling the guide member.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional copying machine, Fig. 2 is a perspective view of a conventional roll paper cutting device, Fig. 3 is an explanatory diagram showing the formation of a roll paper loop in the cutting device, and Fig. 4 is a roll paper cutting device. FIG. 5 is a side view of a roll paper cutting device according to an embodiment of the present invention, and FIG. 5a is a perspective view of a roll paper guide member used in the device of FIG. 5. figure,
FIG. 6 is a side view of a roll paper cutting device according to another embodiment of the present invention, and FIG. 6a is a perspective view of a guide member used in FIG. 6. 1... Photosensitive drum, 2... Developing device, 3... Corona discharger for transfer, 4... Roll paper, 5... First
Feeding roller, 6... Cutting device, 7... Second feeding roller, 8... Fixed blade, 9... Rotating blade, 10... Motor, 11... Third feeding roller, 12... Fixing device , 14... Loop, 15... Rotating space of rotary blade, 16... Guide, 20, 23, 24... Roll paper guide member, 21, 22... Bracket.

Claims (1)

[Claims] 1 Equipped with a fixed blade and a rotating blade, the roll paper is passed between both blades and the roll paper is cut into a predetermined length by the rotation of the rotary blade. Due to the difference in paper feeding speed between the feeder and the second feeder on the downstream side, the paper is curved to form a loop at the cutting position and downstream thereof, and the curve is formed in the opposite direction to the curl of the roll paper. be done,
In the roll paper cutting device of the copying machine, the tip of the cut roll paper is guided to the entrance of the second feeder.
One end of a guide member made of a flexible and tough thin sheet material is fixed near the cutting position and outside the rotation space of the rotary blade, and the other end of the guide member is fixed to a second feeding point. A roll paper cutting device characterized by having a free end extending toward the entrance of a container.