JP2508678B2 - Paper retracting device in roll paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention uses roll-shaped paper, such as a large copying machine, and uses a cutter from a roll of paper according to the length of the original. The present invention relates to a paper retracting device in a roll paper feeding device such as an electronic copying machine, which is configured so that a paper of a required length can be created by cutting and then copying can be performed.

(Prior Art) For copiers such as A0 size or A1 size that copy on wide and long paper, cut paper is stored in the paper tray as in the case of small copiers. In such a state, it cannot be set in the copying machine, and such a large size paper is very rarely used as a cut paper.

Therefore, conventionally, in a large-sized copying machine, a sheet of paper wound in a roll shape is attached to the sheet feeding section, and the sheet is made to match the size of the original before being fed to the toner image transfer section. Cut the cut paper obtained by cutting,
A means for transferring the image toward the image transfer portion of the copying machine is used.

This is because when a wide sheet having a length of several hundred meters is wound in a roll shape, the weight of the sheet is more than 10 kg, and it cannot be easily reattached to the sheet feeding device. First, it is necessary to previously equip the paper feeding device with the type of paper expected to be used.

Further, in the copying machine as described above, several kinds of papers of different kinds or roll papers of different sizes can be loaded in the paper feeding section, and the paper is provided on the control panel of the copying machine. From the loaded roll paper,
A mechanism is used so that copying can be easily performed by designating a required type or size of roll paper.

In the paper feeding device having the above-mentioned mechanism, the length of paper feeding from the paper roll is regulated by the feed roller provided at the end of the paper transport path, The paper feed length can be controlled by arbitrarily setting the rotation speed of the feed roller.

(Problems to be Solved by the Invention) However, in the conventional copying machine capable of mounting a plurality of roll papers as described above, the paper rewound from the roll paper is supplied to the cutter portion via the feed roller. At this time, it is necessary to set a long interval between the feed roller and the cutter portion.

This is because when a plurality of paper rolls of relatively large size are mounted in the vertical direction, it is necessary to separate the feed roller provided corresponding to each roll paper from the cutter mounting. Therefore, a paper transport path is formed between the feed roller and the cutter device, and the paper is guided into the paper transport path.

However, when the paper transport path is formed to be long, the slack in the paper occurs in the gap between the upper and lower guide plates that make up the paper transport path. Unevenness is not fixed and irregularities are likely to occur, which tends to cause unfavorable situations such as affecting the cut length of paper.

When paper is supplied from one roll and then paper is supplied from another roll, the paper from the roll that was previously feeding paper is slightly retracted and the next paper is fed. It is necessary to move the paper toward the cutter section. However, even in this case, if there is a lot of slack in the paper in the paper transport path, the next paper will be fed while the edge of the previous paper remains in the cutter, so in the worst case In this case, the two sheets are fed to the image transfer portion in a state where they are overlapped.

In order to prevent the occurrence of the above-mentioned inconvenient state, an auxiliary paper feed roller provided in the front part of the cutter device or a paper reverse mechanism for the feed roller is provided so that the paper may be fed every time copying is performed. A mechanism for retracting the tip may be provided.

However, when providing such a paper reverse mechanism,
Since the mechanism is provided separately from the drive mechanism of the feed roller, the structure of the sheet feeding device becomes complicated and
For example, the necessity of performing the control operation separately causes the manufacturing cost of the sheet feeding device to increase.

(Object of the Invention) The present invention solves the above-described drawbacks of the conventionally used apparatus. The feed roller is provided with a reversing mechanism, and a force is applied to the reversing mechanism by a feeding operation. At the same time when the feeding operation of the paper feed roller is completed, the feed roller is driven in the reverse direction by a certain angle by the reverse mechanism so that the leading end of the paper can be retracted to a position where it does not interfere. It is an object of the present invention to provide a paper retracting device for a roll paper feeding device.

(Means and Actions for Solving Problems) According to the present invention, a plurality of roll papers are mounted at the same time, paper is fed from the roll papers to a cutter device through a feed roller, and a predetermined side is cut by the cutter. The present invention relates to a device that feeds the cut paper toward the image transfer unit.
In the present invention, a roller retreating mechanism is provided for the feed roller, and in the roller retreating mechanism, a torsion spring is arranged between a sprocket that transmits the rotation of the roller and a disc provided on the shaft of the sprocket. A mechanism for accumulating a force in a state in which a spring is wound by the rotation of the sprocket and a compression spring for urging the brake pad in a direction in which the brake pad is pressed against the disc are arranged.

Therefore, in the paper feeding device of the present invention, since the leading end portion of the fed paper is automatically retracted,
Even when copying is performed using another sheet, since the preceding sheet is stopped at a position where it does not interfere with the transfer, normal sheet feeding operation can be continued.

Further, the paper retracting device in the roll paper feeding device of the present invention has a relatively simple mechanism, and does not require any other drive device for reversing the feed roller. It is possible to simplify the drive mechanism of.

(Embodiment) The configuration of the paper retracting device in the roll paper feeding device of the present invention will be described with reference to the illustrated embodiment.

As shown in FIG. 1, a roll paper feeder 1 of the present invention has a plurality of roll papers 2 and 2a mounted at the same time. The paper can be fed as needed through the paper selection mechanism provided in the above.

In the roll paper feeding device 1 of the present invention, a roller conveying device including a feed roller 10 and a pinch roller 10a is provided for each roll paper, and the paper between the feed roller 10 and the cutter device 6 is provided. The conveyance path 3 is composed of an upper guide plate 4 and a lower guide plate 4a, and the paper conveyed by the feed roller 10 is guided to the paper conveyance path 3 formed by the guide plates.

The paper transport path having the above-described configuration is similarly provided for the roll paper 2a, and in a device in which three or more roll papers are mounted, for each roll paper,
A paper feed path and a feed roller are provided.

The paper transport path is designed to be joined at a portion in front of the cutter device 6, and an auxiliary roller 5 is provided at the joined portion. Then, the sheet fed by the auxiliary roller 5 is cut by a cutter device 6 composed of a rotary blade 7 and a fixed blade 8 and is transported toward an image transfer device of a copying machine.

As shown in FIG. 2, the feed roller 10 of the present invention.
Has a clutch 14 and a drive sprocket at one end of its shaft 11.
And a drive belt 13 are stretched over the sprocket 12 and driven by a drive mechanism (not shown).

This driving is performed by turning on and off the clutch mechanism 14, and when the sheet is fed by the feed roller 10, counting the pulses applied to the driving motor or turning on the clutch 14 is performed. It is possible to arbitrarily control the paper feed length and the like by setting or the like.

At the other end of the feed roller 10, a roller side sprocket 16 is provided together with the brake mechanism 15, and a conduction belt 17 is provided between the roller side sprocket 16 and the input sprocket 23 of the roller retraction mechanism 20. There is.

The roller retraction mechanism 20 of the present invention has a structure as shown in FIG. 3, and the input sprocket 23 is fixedly provided on an input sprocket shaft 24 provided on a frame 21 via a bearing 22. Further, a torsion spring 25 is provided around the input sprocket shaft 24.

Further, a disc 27 is provided facing the end of the input sprocket shaft 24, and a brake pad 30 is provided so as to come into contact with the other side surface of the disc 27.

The brake pad 30 is supported by a shaft 33, and the shaft 33 is configured to be supported by a bearing 34 provided on the other side portion of the frame. Then, the brake pad 30
Is pressed by the compression spring 31 and
The end portion of 31 is locked to the spring fixing portion 32.

Further, as shown in FIG. 4, in the roller retreating mechanism of the present invention, the input sprocket shaft 24 is provided with a pin 26 at its end, and a protruding member 28 is formed on the side of the disk 27 corresponding to the pin. Has been done.

Both ends of the projecting member 28 are set as locking step portions 29, 29a, and as shown in FIG. 5, when the input sprocket shaft 24 rotates, a predetermined angle range (180 in the illustrated example). In ()), the input sprocket shaft 24 can freely rotate, but when the input sprocket shaft 24 is rotated by a larger angle, the pin 26 engages with the locking step 29 or 29a,
It is designed to rotate the disc 27. The angle of the stepped portion of the protruding member provided on the disk 27 of the present invention described above can be arbitrarily set, and is set by the size of the feed roller, the retreat distance of the paper, or the like.

Next, the roller retreating mechanism having the above-described configuration of the present invention
At 20, the operation of rotating the feed roller in the reverse direction will be described.

In the roll paper feeder 1, when feeding from the roll paper 2, the feed roller 10 provided corresponding to the roll paper 2 is rotated in the forward direction, and the rotation of the roller 10 causes the roll paper 2 to rotate. The sheet is pulled out from the sheet 2, conveyed toward the auxiliary roller 5, and cut into a predetermined size by the cutter device 6.

By rotating the feed roller in the forward direction, the input sprocket is passed through the roller side sprocket 16.
23 is rotated and the torsion spring 25 is wound up. In the above-described embodiment of the present invention, the stop torque of the brake pad 30 on the disc 27 is set to be larger than the hoisting torque of the torsion spring 25.

As described above, when the torsion spring 25 is wound up by 180 °, the pin 26 provided on the input sprocket shaft 24 is
However, the disk 27 is brought into contact with the locking step 29 of the disk 27, the disk 27 is directly driven by the pin 26, and the input sprocket shaft 24 and the disk 27 are integrally rotated.

In that state, the rotational force of both members exceeds the stop torque of the brake pad 30 set by the compression spring 31, so that the disc 27 slips on the brake pad 30, and the disc 27 is fed during the feeding of the sheet. 27 continues spinning.

When the feed roller 10 is rotated by a predetermined amount and the conveyance of the paper is completed, the clutch 14 is turned off, and at the same time, the brake 15 is operated and the paper feed roller 10 is stopped. At that time, since the torsion spring 25 is still wound up, when the brake 15 is turned off, the torque accumulated in the torsion spring 25 causes the feed roller 10 to rotate in the reverse direction by 180 °. Only the angle will be reversed.

Therefore, as described above, the reverse rotation of the feed roller causes the sheet to be retracted by a predetermined distance, and the sheet is deviated from the position of the nip formed by the auxiliary roller 5 and stopped at the standby position. .

In the roller retraction mechanism 20 of the present invention described above, the torque of each member is set as follows.

T1: Torque required to reverse the feed roller T2: Torsion spring winding start torque T3: Torsion spring winding end torque T4: Brake pad stop torque When set as above, T1 <T2 <T3 < By setting the relationship of T4, the above-described roller retraction mechanism of the present invention can be operated in a good state.

Further, in the roller retreating mechanism of the present invention, since the roll paper which has been used is retracted immediately after the end of the paper feeding operation, the auxiliary roller 5 is provided to assist the operation of the conveyance of the paper to the cutter device 6. The hindrance does not occur, and the auxiliary roller 5 can be operated in a good state.

(Effect of the Invention) The paper retracting device in the roll paper feeding device of the present invention is
With the above-described configuration, the roller retreating mechanism provided for the feed roller can retract the paper by a predetermined distance at the end of conveyance of the paper, and as a result, the paper can be fed next. This prevents the preceding sheet from interfering with the inside of the sheet conveyance path when the sheet is formed.

Further, the roller retraction mechanism of the present invention does not use electric parts such as a motor and a solenoid, and does not need to provide a device such as a control device for electric members as in the case of the conventional device. Therefore, the manufacturing cost of the roller retreating mechanism can be reduced, and in addition, the reverse rotation angle of the feed roller can be easily adjusted.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the constitution of a roll paper feeding device of the present invention, FIG. 2 is a plan view of a feed roller of the present invention, FIG. 3 is a plan view of a roller retraction mechanism, and FIG. 4 is an input sprocket shaft. FIG. 5 is an explanatory view showing the relationship between the disk and the disk, and FIG. 5 is an explanatory view showing the relationship between the pin of the input sprocket shaft and the protruding member of the disk. Reference numeral in the drawing 1 ... Roll paper feeding device, 2 ... Roll paper, 3 ... Paper transport path, 5 ... Auxiliary roller, 6 ... Cutter device, 7 ...
… Rotating blade, 8 …… Fixed blade, 10 …… Feed roller, 10a
...... Pinch roller, 11 …… Axis, 12 …… Drive sprocket, 13 …… Drive belt, 14 …… Clutch, 15 …… Brake, 16 …… Roller side sprocket, 17 …… Conduction belt,
20 …… Roller retraction mechanism, 21 …… Frame, 22 …… Bearing,
23 …… input sprocket, 24 …… input sprocket shaft,
25 …… torsion spring, 26 …… pin, 27 …… disc, 28 …… projecting member, 29 …… stop step, 30 …… brake pad, 31 …… compression spring, 32 …… spring fixing part, 33 ......
Shaft, 34 ... Bearing.

Claims (1)

(57) [Claims] 1. A plurality of roll papers are mounted at the same time, the roll papers are fed to a cutter device through a feed roller, and the cutters send out as cut papers of a predetermined size toward an image transfer section. In the apparatus, a roller retreating mechanism is provided for the feed roller, and in the roller retreating mechanism, a torsion spring is arranged between a sprocket that transmits the rotation of the roller and a disc provided on a shaft of the sprocket. A sheet retracting device in a roll sheet feeding device, characterized in that a mechanism for accumulating force in a state of winding a spring by the rotation of the disk and a compression spring for urging the disc in the direction of pressing the brake pad are arranged. apparatus.