JPS649156B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to copying machines, facsimile machines, etc.
The present invention relates to a roll paper supply device that automatically cuts paper to a fixed size and feeds the paper supplied from the roll.

BACKGROUND ART FIG. 1 shows a conventional example of a paper feeding device in a copying machine or the like that uses roll paper as recording paper.

Paper 02 pulled out from roll paper base roll 01
is conveyed to the cutting device 05 side by a pair of paper feed rollers 03 through a baffle (paper guide plate) 04. When the paper 02 is conveyed by a predetermined length behind the fixed cutter 06 and the rotating cutter 07 in the cutting device 05, the rotation of the paper feed roller 03 is stopped, and the rotation of the rotating cutter 07 causes the paper 0
2 is disconnected. In this way, the sheet-like paper 02a cut into a predetermined length is divided into two
b and is fed to the next process.

In this case, the rotary cutter 08b is
It is arranged outside the rotation radius of the rotary cutter 07 so as not to interfere with the rotary cutter 7.

Problems to be Solved by the Invention However, in the conventional apparatus described above, the baffle 08b is arranged and fixed outside the rotation radius of the cutter, and a path with a predetermined width for conveying the paper 02 is not formed. When the paper 02 is conveyed through the baffle 08b, the guiding effect of the buff 08b is reduced. In a state where the paper 02 does not have any peculiarities such as curvature, there is no problem with the bent full shape, but since the winding curvature is small in the inner layer part of the roll paper base winding 01, that is, at the rear end of the paper feed, the paper 02 has a small winding curvature.
A strong curl remains on the sheet 2, and as shown in FIG. 2, the leading edge of the sheet hits the buff 08b, making it easy to cause a paper jam.

Therefore, as shown in Fig. 3, it may be possible to set the roll paper 01 in the opposite direction to the case shown in Fig. 1. If this is done, the leading edge of the paper 02 will escape to the outside of the conveyance path. It is possible to prevent the phenomenon of bumping into the baffle 08b.

However, if the sheet 02a is curled in the opposite direction, it will curl in the opposite direction with respect to the photosensitive drum D in an electrophotographic copying machine, for example, and the leading and trailing ends X and Y of the sheet 02a will be curled in the opposite direction.
Adhesion with the photosensitive drum D is reduced, and dilation (image omission) due to incomplete transfer is likely to occur (see FIG. 4). Therefore, the reverse set method as shown in FIG. 3 is difficult to adopt in view of the quality of copying.

The present invention was devised in response to such problems, and its purpose is to ensure paper transport guidance in a paper feeder equipped with a cutting device using a rotary cutter, and to prevent paper jams. The point is to prevent it.

Means and Effects for Solving the Problems In accordance with the above object, the present invention provides an automatic roll paper feeding device equipped with a cutting device using a plate-shaped rotary cutter, in which a variable paper guide plate is provided in correspondence with the plate-shaped rotary cutter. The variable paper guide plate is provided so as to be tiltable, and the variable paper guide plate is positioned to form a roll paper guide path between the plate-shaped rotary cutter when transporting the roll paper, and in conjunction with the operation of the plate-shaped rotary cutter when cutting the roll paper. The rotary cutter is configured to tilt to a position outside the rotation radius of the rotary cutter, and the plate-shaped rotary cutter is synchronized with the rotation of the paper feed roller and connected to the constantly rotating transmission shaft via a clutch structure. The automatic roll paper feeding device is characterized in that the roll paper conveyed by the paper feed roller is fed by a roll paper guide formed by a variable paper guide plate and a plate-shaped rotating cutter. When the paper passes through the path and is fed out for a predetermined length, the feeding by the feed roller is stopped, and then the solenoid is operated and the rotary cutter drive shaft is connected to the transmission shaft that is constantly rotating by the clutch mechanism and rotated. The cutter rotates, and in conjunction with this rotation, the variable paper guide plate tilts to a position where it does not interfere with the cutter. In this way, the paper is cut to a fixed size, and the cut paper is sent to the next process. The variable paper guide plate, which is tilted so as to be located outside the radius of the rotary cutter during cutting, returns to its initial position as the cutter rotates. At the same time, the clutch is also disengaged and the rotation of the cutter ends. This operation is repeated.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 5 to 7.

The configuration of the automatic roll paper feeding device 1 is similar to that of the device shown in FIG. 1, except for the variable buffle 14.
The paper 31 pulled out from the roll paper base winding 30 is conveyed by the paper feed roller 2 through the fixed baffle 5 to the fixed cutter 6 and plate-like rotating cutter 9 side.
The roll paper 31 passes through a guide path formed by the variable buffle 14 and the plate-like rotary cutter 9, is fed out for a predetermined length, and is cut at the same portion, resulting in a sheet 32.
The automatic roll paper feeding device 1 is configured to feed the rolled paper to the next process guided by step 4.

Thus, the paper feed roller 2 includes a drive roller 3 and an idle roller 4 that comes into contact with the drive roller and rotates as a result of the drive roller 3.
The drive shaft of the drive roller 3 is connected to a drive motor via an electromagnetic clutch.

Further, the fixed cutter 6 in the cutting device is provided with a blade 6a, and is supported by a compression coil spring 7 with back pressure for effective contact with the rotary cutter 9. On the other hand, blade 9
A pair of cams 11 are pivotally attached to a rotary cutter drive shaft 8 on which a rotary cutter 9 having a rotary cutter 9 is pivotally attached, close to both ends of the rotary cutter 9. This cam 11 is integral with a perfectly circular cam base 10, and the shape of the cam 11 is such that a variable buffle 14 (described later) that is in constant contact with the cam 11 moves outside the same rotation radius as the rotary cutter 9 rotates. It is designed so that it can be tilted and displaced. The rotary cutter drive shaft 8 is connected via a spring clutch 20 to a drive system consisting of a motor 23, a drive sprocket 24, a chain 25, and a driven sprocket 26. spring clutch 20
A collar 8a is integral with the rotating cutter drive shaft 8, a collar 27a is integral with the rotating shaft 27 of the driven sprocket 26,
It is composed of a wrap spring 22 that is fitted into the sleeve 21 and both shafts 27, 8, and whose one end is locked to the sleeve 21 on the side of the collar 27a.
Further, a pawl 29 operated by a solenoid 28 is engaged with a locking groove provided in the sleeve 21. When the clutch 20 is disengaged from the locking groove of the sleeve 21, the drive sprocket 24,
A wrap spring 22 is wound around a rotary transmission shaft 27 and a rotary cutter drive shaft 8, which are rotated via a chain 25 and a driven sprocket 26, so that the rotary shafts 27 and 8 are rotated together.

Further, a fixed baffle 12 is provided at the rear of the rotary cutter 9, and a variable buffle 14 paired with the buffle 12 has a shaft 13 at its base end.
The tip of the cutter 9 is rotatable.
The cutter 6 is slidably supported by the cam 11 within the rotation radius of the cutter 6, and is formed to be as long as possible within a range that does not interfere with the fixed cutter 6 during displacement. In addition, the variable buffle 12 is slidably regulated by the cam base 10 on both sides of its tip.

In the above configuration, the paper 31 is pulled out from the roll paper base roll 30 by the paper feed roller 2, and the leading end of the paper passes beyond the cutters 6 and 9 by a predetermined length according to the set size, and is transferred to the fixed buttfull 12 and the variable buttfull 14. Therefore, when the paper is conveyed rearward while being effectively guided, feeding by the paper feed roller 2 is stopped.

Next, when the solenoid 28 is operated and the claw 29 is released from the locking groove of the sleeve 21, the rotating shaft 27 and the rotating cutter drive shaft 8 are connected, and the rotating cutter 9, cam 11, and cam base 10 rotate integrally. be forced to start. At this time, the variable buttful 14 whose tip is supported by the cam 11
is tilted about the shaft 13 and does not interfere with the rotary cutter. In this way, the paper 31 is cut to a fixed length by the blade 9a of the rotary cutter 9 and the blade 6a of the fixed cutter 6, and the obtained sheet 3
2 is sent to the next process. During this time, the variable baffle 14 is pushed out of the rotation radius of the rotary cutter, and then returns to its initial position as the rotary cutter rotates.

Note that after the claw 29 is disengaged from the sleeve 21,
The rotary cutter 9 immediately returns to contact with the outer peripheral surface of the rotating sleeve 21, and automatically engages with the locking groove in the sleeve 21 when the sleeve 21 rotates once.
When the clutch 20 rotates once and returns to the initial position, the clutch 20 is disengaged and rotation stops.

If a further sheet 32 is required, the series of operations described above is repeated.

Effects of the Invention The present invention provides a variable paper guide plate within the rotation radius of a plate-shaped rotary cutter, so that the variable paper guide plate is moved out of the rotation radius in conjunction with the operation of the rotary cutter only when the rotary cutter operates. Since I configured it as
Paper feed rollers can feed the paper to the cutting device, and in particular, a plate-shaped rotary cutter and a variable paper guide plate can define a paper guide path, and the interval between the guide paths can be made as narrow as possible. Therefore, regardless of the paper feeding direction, even paper that is strongly curled toward the variable paper guide plate can be reliably guided and conveyed.
Paper jams in the cutting device can be reliably prevented.

This also makes it possible to reduce the core diameter of the roll paper base winding and reduce the outer diameter of the roll paper base roll, without worrying about curling problems in roll paper, which is advantageous for small machines. Can be used.

Furthermore, the rotating cutter shaft is connected to the constantly rotating transmission shaft via a clutch mechanism in synchronization with the rotation of the paper feed roller, so the series of processes for transporting and cutting the roll paper does not require the use of complex mechanisms. It can be done automatically and very easily.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a known roll paper feeding device, Fig. 2 is a schematic explanatory diagram showing a state in which a paper jam occurs in the same device, and Fig. 3 is a schematic explanatory diagram showing a state in which a paper jam occurs in the device. A schematic explanatory diagram; FIG. 4 is an explanatory diagram showing the relationship between curling of paper and a photosensitive drum; FIG. 5 is a schematic explanatory diagram of a roll paper supply device according to an embodiment of the present invention; FIG. 6 is a main part of the same. The explanatory diagram, FIG. 7, is a schematic explanatory diagram of the main part as viewed from the - line in FIG. 6. 1... Automatic roll paper feeding device, 2... Paper feeding roller, 3... Drive roller, 4... Idle roller,
5...Fixed cutter, 6...Fixed cutter, 7...
... Compression coil spring, 8 ... Rotating cutter drive shaft, 9 ... Rotating cutter, 10 ... Cam base, 11 ... Cam, 12 ... Fixed buttful, 13
...shaft, 14 ... variable knob, 20 ... spring clutch, 21 ... sleeve, 22 ... lap spring, 23 ... motor, 24 ... drive sprocket, 25 ... chain, 26 ... driven sprocket , 27... Rotating shaft, 28... Solenoid, 29... Claw, 30... Roll paper base winding, 3
1...Paper, 32...Sheet.

Claims (1)

[Claims] 1. In an automatic roll paper feeding device equipped with a cutting device using a plate-shaped rotary cutter, a variable paper guide plate is provided in correspondence with the plate-shaped rotary cutter so as to be tiltable, and the variable paper guide plate is configured to rotate when the roll paper is transported. It is configured to be tilted to a position where a roll paper guide path is formed between the rotary cutter and the rotary cutter, and to a position where the rotary cutter moves outside the rotation radius of the rotary cutter in conjunction with the operation of the rotary cutter when cutting the roll paper. An automatic roll paper feeding device characterized in that the plate-shaped rotary cutter is synchronized with the rotation of the paper feed roller and is operated intermittently via a clutch structure on a constantly rotating transmission shaft.