JPH0597301A - Driving device for roll paper feeding device - Google Patents

Abstract

PURPOSE:To prevent an excessive driving force from being transmitted to a sheet carrying device at the time of driving a cutter driving device and a roll paper feeding means by use of a single large capacity motor in an electronic copying machine for making a recording paper of large size by use of a roll paper. CONSTITUTION:In a driving device in a paper feeding device for electronic copying machine, roll paper driving devices 50, 60, 70, 80 provided on a sheet carrying device are driven, respectively, by one motor 31 through a cutter driving device 32. The output gear 35 of the driving device 32 has a torque limiter, so that the output gear 35 can be stopped to cut the driving force to the sheet carrying device when an excessive load is given to the sheet carrying device because of the jam of a sheet in a sheet carrying passage and other accidents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electronic copying machine for making a large size recording paper by using a roll paper, and more particularly, for a paper cutting mechanism requiring a large driving force. The present invention relates to a drive device provided with a mechanism capable of limiting a drive torque in the paper transport device when a paper transport device requiring a relatively weak driving force is provided.

[0002]

2. Description of the Related Art In a large-sized electronic copying machine for drawings or the like, unlike a conventional electronic copying machine using cut paper, a roll paper is mounted in a paper feed section to keep track of the length of a document. Is used to cut a sheet into a predetermined length to make a recording sheet. In the large electronic copying machine,
For example, as disclosed in Japanese Patent Laid-Open No. 1-220657, two or three roll papers having different paper qualities and sizes are accommodated in a paper feeding unit, and an operator selects a desired paper so that an arbitrary paper can be selected. The used recording paper can be created. In addition, the paper fed from the roll paper is configured such that the cutter device is operated according to the length of the original document so that a recording paper having an arbitrary length can be created.

Further, in the electronic copying machine as described above, as shown in Japanese Patent Laid-Open No. 63-180660, the length of the paper fed from the roll paper is detected, and the paper is cut by a cutter device. After that, the sheet is retracted to the upstream side of the merging section to position the leading edge of the sheet. When creating the next recording paper, it does not interfere with the operation of sending the paper from the other roll paper, and at the time of sending the next paper, the feeding length of the paper from the roll paper can be easily controlled. I am trying. Further, in the roll paper feeding device shown in the above-mentioned conventional example, there are many cases where means for separately providing a drive mechanism for the paper transport device and a drive mechanism for the cutter device are used, and by using such a drive system, , The paper feeding operation can be easily controlled.

[0004]

In an apparatus for producing recording paper using large-sized paper such as the above-mentioned conventional electronic copying machine, for example, in order to handle large-sized paper such as A0 size paper. The cutter device requires a relatively large driving force, and a driving motor for that purpose has a large capacity. However, since the cutter device is driven for a very short period of time as compared with the sheet conveying device, there is a problem that the performance of the drive motor having a large capacity cannot be used effectively. Therefore, in order to effectively use the drive motor, it is conceivable to configure a drive mechanism using one motor to drive the cutter device and another device such as a paper transport device in a linked state. Has been.

However, in order to carry out the cutting action on a large-sized sheet in a good condition, when a large-capacity drive motor is used to drive the conveying roller device of the sheet conveying device, etc., the conveying roller device, etc. A very strong driving force will be given to. Then, even when a jam or the like occurs in the paper transport path, the jam detection mechanism operates and before the driving of the roller device is stopped,
There is a problem in that the action of sending extra sheets of abnormal paper is continued. Therefore, for example, when the paper is wound around the roller, the gear or chain of the drive system may be damaged due to overload on the drive system of the roller, and the paper may be jammed in the paper transport path. In this case, problems such as deformation of the guide plate are likely to occur.

Most of the conventional large-sized electronic copying machines using roll paper do not have a drive torque limiting means for the drive system of the paper transporting device, so that the above-mentioned paper is used. In many cases, when an accident occurred in the transfer device, troubles such as damage to the drive system were caused. Therefore, it has been proposed to provide a torque limiter between the output shaft of the drive motor and the input shaft of the transport roller device in order to control the driving force for the paper transport device as described above. However, in a device in which a plurality of roll papers are mounted in the roll paper feeding device, providing a means for controlling the drive torque for each paper transport path from each roll paper complicates the device configuration. There is a problem.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the driving means for the conventional sheet conveying device. In a device for driving the cutter device and the sheet conveying device by one driving motor, the driving motor is used. A mechanism for directly driving the cutter device and transmitting the driving force to the sheet conveying device via the driving force control means,
It is an object of the present invention to provide an apparatus that does not apply an extra driving force to a sheet conveying device when an accident occurs in the sheet conveying device.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of roll paper feeding devices are provided which are detachably attached to a main body portion having a mechanism for scanning an image of a document and recording the image. Of the roll paper, the paper transport path for feeding the paper from the plurality of roll papers is merged, and a mechanism for cutting the paper downstream of the merged portion, and a paper feed roller are arranged. In the roll paper feeding device of the present invention, drive means for the paper transporting device and a mechanism for cutting the paper are separately provided, and both motors are driven by using one motor, and the paper cutting mechanism and the paper transporting device are provided. Between the drive system, means for controlling the drive torque for the sheet conveying device is provided. Further, as the drive torque control means provided in the drive system of the present invention, it is possible to use means for transmitting a drive force of an extent necessary for feeding the paper from the roll paper in a state where the paper is normally fed. ..

With the configuration as described above, in the drive device for the roll paper feeding device of the present invention, one mechanism having a large capacity is used to drive each mechanism of the roll paper feeding device. By using one drive torque control means for the sheet conveying device, the structure of the drive mechanism can be simplified. Further, since the means for controlling the drive torque arranged with respect to the sheet conveying device is configured to transmit a relatively weak driving force, it is possible to sufficiently cope with a jam or the like in the sheet conveying path. Safety can be ensured for each mechanism of the drive system.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drive unit for a roll paper feeder according to the present invention will be described with reference to the illustrated example. As shown in FIGS. 1 and 2, an image forming apparatus 1 of the present invention is configured as a large-sized electronic copying machine that scans a drawing or the like to create a recording sheet. A mechanism for scanning
A recording paper creating mechanism is provided. Further, a roll paper feeding device 10 is provided separately from the main body 2 of the electronic copying machine 1, and the roll paper feeding device 10 has a function as described later.
A mechanism is provided for accommodating a plurality of roll papers and feeding the paper drawn from the roll papers while cutting the paper into a predetermined length. As shown in FIG. 2, the roll paper feeding device 10 is provided so as to be movable to the front side with respect to the device main body 2, and is used for maintenance of the main body, etc. Can be moved along with the guide member 9 so that the apparatus main body and the paper feeding apparatus can be separated from each other during maintenance of the roll paper feeding apparatus or the apparatus main body.

At the top of the main body 2 of the electronic copying machine 1,
A recording paper discharge tray 7 is arranged so that the upper part of the apparatus receives the recording paper conveyed upward through the recording paper guide portion 4 provided at the rear part of the apparatus. In addition, a control panel 3 is arranged on the front surface of the main body, and it is necessary to create a recording sheet by using the buttons and the like provided on the control panel 3 as in a general electronic copying machine. Make them enter information. A manuscript table 5 is arranged under the control panel, a long manuscript D is inserted from the manuscript table 5, an image is scanned, and the scanned manuscript is arranged on the upper part of the control panel 5. Then, the document is stored in the original discharge tray 6.

The roll paper feeder 10 used in combination with the main body of the electronic copying machine accommodates four roll papers 11 to 11c therein as shown in FIG.
Corresponding to each roll paper, the paper transport paths 13 to 13
c is arranged. At the entrance of the paper transport path,
The nip roller units 12 to 12c are arranged,
Conveying roller devices 14, 1 are provided in the middle of the sheet conveying path.
4b and 14c are respectively arranged to carry the paper in the paper carrying path. Since the paper carrying path 13a of the paper carrying path is provided in the vicinity of the merging portion, the carrying roller device is not provided in the middle. The paper fed out from each of the roll papers 11 to 11c is the paper conveyance path 13 corresponding to the paper.
.About.13c toward the merging section, and at the merging section, only the selected paper is sent out through the conveying roller device 20, cut by the cutter device 25, and fed toward the recording paper creating section. I am trying to do it.

In the roll paper feeder 10 of the present invention, a conveying roller device, a cutter device, etc. are arranged between the merging portion and the recording portion (not shown) as shown in FIGS. 3 and 4. Then, the paper is sent out toward the image recording unit via the paper feed path 28. In the roll paper feeder 10 of the present invention, recording paper can be created using cut paper without using roll paper, and the manual paper feed path 13d is arranged at the top of the device. The paper fed from the manual paper feed path 13d is made to join the paper feed path 28 at the downstream portion of the cutter device 25. As shown in FIG. 4, the merging unit 15 merges the four sheet conveying paths 13 to 13c and guides the sheets toward the cutter device 25 via the conveying roller device 20.

A transport roller device 26 and a registration roller device 27 are arranged downstream of the cutter device 25.
The guide for the sheet and the sheet can be fed toward the image recording unit at a constant speed. The cutter device 25 used in the device of the present invention, as shown,
The rotary blade 25b is arranged with respect to the fixed member 25a so that the paper can be cut to an arbitrary length. In order to cut the paper fed from the roll paper, a large number of idler rollers 22 are arranged with respect to the drive rollers of the conveying roller device 20 arranged between the merging portion 15 and the cutter device 25. One is replaced with the rotary member 29 of the rotary encoder. Then, information on the length of the paper is obtained from the information on the rotation of the rotary member 29 of the encoder, and the cutter device 2
A means for activating 5 to cut the paper is used.

Further, in the apparatus of the present invention, the cutter device 2
5 and the conveying roller device 26 can be configured to guide the paper while forming a loop on the paper. Then, when cutting the paper fed from the roll paper, a method is used in which the feeding action of the transport roller device 20 is stopped and the cutter device 25 is operated to cut the paper. As described above, even when the transport roller device 20 is stopped, there is a margin of the loop portion of the sheet formed between the cutter device 25 and the transport roller device 26 toward the recording portion of the sheet. The transport action is continued, even if the paper is stopped for a short time,
It does not hinder the recording of images. As described above, when cutting the paper fed out from the roll paper while the paper is temporarily stopped, compared to the case where the paper is cut while running, as in the case of the conventional device. Thus, the action of cutting the paper can be favorably performed, and the mechanism of the rotary blade of the cutter device can be simplified.

(Operation for Cutting Paper) In the embodiment of the present invention, the operation for cutting the paper will be described based on the information on the length of the paper obtained from the paper length detecting means. First, when the leading ends of the papers fed from all the roll papers are at the standby position on the upstream side of the merging portion, the selected papers are fed by the transport roller device and the nip roller unit corresponding to the paper transport path. By being driven, the sending operation is performed. Then, when the leading edge of the selected sheet passes through the sheet length detecting section, the action of detecting the length of the sheet is started. Then, the paper is sent out by a length corresponding to the original, and when the trailing end of the paper reaches the position of the cutter device 25, the cutter device 25 is operated to cut the paper.

The information on the distance between the transport roller device 20 and the cutter device 25 is stored in the CPU of the control device in advance. However, when the paper at the standby position is sent out, the paper passing through the detection unit is not detected. In order to detect the length from the leading end of the sheet, the feed roller device 20 is stopped after the sheet is fed by an extra sheet feeding interval with respect to the length to be cut, and the length of the sheet is cut by the cutter device 25. Disconnect with setting. On the other hand, when the second recording sheet is created, the leading edge of the sheet is stopped by the cutter device 25, so the transport roller device provided in the sheet transport path and the nip roller unit must be driven. Then, the detection unit provided in the transport roller device 20 feeds the paper from the roll paper while detecting the feeding length. Then, while counting the pulses output from the detection means, the paper of the required length is fed and the paper is fed by the set length,
The conveyance roller device 20 is stopped and the cutter device 25 cuts the paper.

In the roll paper feeding device 10, when it is desired to accurately trim the leading edge of the paper when the roll paper is loaded, etc., the roller device arranged in the paper transport path is manually driven. , The tip of the paper is a cutter device 2
5 can be used to cut by driving manually. When manually feeding the paper, the nip roller unit and the transport roller device arranged in the paper transport path can be driven by a drive knob (not shown), and the transport action in the paper transport path can be performed. Can be done. However, in the device shown in FIG.
Since it is not possible to drive the transport roller device 20 disposed downstream of 5, the transport roller device 20 is set to a state in which the nip with respect to the sheet is released.

As described above, when the paper is manually fed, the idler roller of the carry roller device 20 is moved in the direction away from the drive roller, and at the same time, the rotating member 29 of the paper feed length detecting means is also moved. It is swung in the direction away from the drive roller. Then, after the paper is fed from the paper transport path to the cutter device 25 through the confluence portion, the leading end of the paper is cut by the cutter device.
Therefore, by releasing the nip in the transport roller device 20, the sheet can be manually fed without receiving extra resistance.

(Structure of Driving Device) In the paper feeding device of the present invention configured as described above, a driving mechanism as shown in FIG. 5 is provided in order to drive the cutter device, the paper conveying device and the like. ing. In the drive device 30 shown in FIG. 5, one drive motor 31 is used,
A mechanism for driving all the rotating devices is provided, and the drive motor 31 is arranged with respect to the cutter driving device 32. Then, the chain 34 of the cutter driving device 32
The output gear 35 is driven via the drive gear, the drive force is transmitted to the idler gear 36 by the output gear 35, and the drive mechanisms corresponding to the four roll papers are driven via the idler gear 36.

The cutter driving device 32 uses a method of directly driving the cutter driving sprocket via the chain 34, and requires the largest driving force among various driven devices arranged in the paper feeding device. The cutter is designed to be driven well. Further, a drive mechanism for the registration roller device 27 is arranged from the drive motor 31 via a chain 49 so as to be able to drive the drive gear. It is also possible to arrange driving means for the roller device via the chain 49.

As will be described later, the output gear 35 provided in the cutter driving device 32 is configured so that the driving force can be transmitted to the sheet conveying device via the torque limiting means. Device output gear 35
Are engaged with the input gear 53 of the drive unit 50 for the roll paper 11 and the transmission gear unit 87 of the drive unit 80 for the roll paper 11c via the idler gear 36, respectively. Further, the driving force is transmitted from the roll paper driving device 50 to the drive device for other roll papers, that is, the drive device 60 for the roll paper 11a and the drive device 70 for the roll paper 11b.

In the roll paper driving device 50, the clutch unit 51 and the output gear 54 are driven by the chain 52 via the input gear 53, and the output gear 54
Mesh with the input gear 63 of the roll paper drive device 60. Further, a transmission gear device 67 is arranged for the roll paper drive device 60 to drive the roll paper drive device 70. Further, the roll paper driving device 80 is driven via the transmission gear device 87 that meshes with the idler gear 36 to drive the clutch unit 81 of the roll paper driving device 80.

The four roll paper drive devices 50, 60,
70 and 80 are roll papers 11 and 11a of FIG.
A drive mechanism for 11b and 11c is configured. That is, driving the roll paper itself in the forward and reverse directions,
The driving of the nip roller unit and the driving of the conveying roller device arranged in the sheet conveying path are performed by clutch units 51, 61, 7 provided in the respective driving devices.
1 and 81. Then, the operation of feeding the paper and the operation of driving the paper in the direction of rewinding the paper to the roll paper after cutting with the cutter are performed. Among the roll paper drive devices, the device in which the transport roller device is provided in the paper transport path is provided with means for transmitting the driving force to each transport roller device. For example, the drive unit 50 for the roll paper 11 is provided with a means for driving the transport roller drive gear 55 from the clutch unit 51 via the chain 56, and the roll paper drive units 70 and 80 have respective clutch units 71 and 81. The transport roller drive gears 75 and 85 are driven via the.

In the sheet feeding device provided with the drive system as described above, when the recording sheet is produced, the clutch unit corresponding to the selected roll sheet is actuated to drive the sheet to be fed out. Then, when the recording paper creating operation for the paper is completed, the transporting devices are driven in the reverse direction slightly, and the leading end of the paper is stopped and held at a position slightly retracted from the confluence of the paper transport path. Further, since the cutter driving device 32 drives the cutter device 25 only for a very short time for cutting the paper, a clutch is provided in the drive unit for the cutter driving gear 33, and only when the paper is cut. Configure the driving mechanism.

(Structure of Torque Limiter) In the above driving device, even when all the devices are driven by using one motor, a large driving force is required for the cutter device, but for the sheet conveying device. Since only one roll paper is fed, a relatively small driving force is sufficient. Further, if a large driving force is exerted in the roll paper feeding section, extra paper may be fed or the drive mechanism for the roller device may be damaged if a jam or the like occurs in the paper transport path. This causes troubles such as maintenance and post-processing of paper. Therefore, in the paper feeding device of the present invention, in the drive mechanism shown in FIG. 5, a torque limiter 40 as shown in FIG. 6 is provided for the output gear 35 provided in the cutter drive device 32 to convey the paper. When a jam occurs in the road or other trouble occurs, the drive of the sheet conveying device can be turned off.

In the driving force transmission mechanism shown in FIG. 6, the output gear 35 is provided on the support shaft 38 supported by the frame 39 of the apparatus, but between the output gear 35 and the sprocket 37, The torque limiter 40 is arranged. The torque limiter 40 can use an arbitrary mechanism used as a general torque transmission means, and drives the sheet conveying device by setting a driving force by the torque limiter to an arbitrary value. To do so. Therefore, by using the mechanism shown in FIG. 6, when a jam occurs in the paper transport path, the resistance of the paper increases and the torque limiter slides, and the other paper is passed through the idler roller. It is possible to stop driving the transport device.

Further, as the driving force transmission mechanism of the present invention,
As shown in FIG. 7, a torque limiter 40a having a friction plate 41 between the sprocket 37 and the gear 35 can be used. In the example shown in FIG. 7, a spring 42 provided behind the sprocket 37 presses against the friction plate 41, and the gear 35 is adjusted by adjusting the pressing force of the spring.
It is possible to regulate the strength of the transmission of the driving force to the.

Further, as shown in FIG. 8, it is possible to use a torque limiter 40b provided with a ratchet member 45 between the sprocket 37 and the gear 35. In the torque limiter shown in FIGS. 7 and 8,
To adjust the pressing force of the sprocket 37 against the output gear 35, a spring 43 is arranged between the flange 42 provided at the end of the support shaft and the sprocket. And in the torque limiter configured as described above,
Only the driving force corresponding to the driving torque required for the sheet conveying device can be transmitted to the idler gear by the output gear, and the overload state of the sheet conveying device can be prevented.

In addition, in the drive device of the present invention, a torque limiter having an arbitrary configuration can be used in addition to the above, and by incorporating the torque limiter in the drive mechanism, an accident in the paper conveyance path can be prevented. Can be adapted. Further, in the drive unit of the present invention, even when a sheet conveying unit requiring a relatively small driving torque is connected to a member requiring a large driving force such as a cutter corresponding to a large size sheet. It is possible to transmit only the driving force required for the sheet conveying device.

[0031]

The drive device of the present invention, which is configured as described above, can drive each mechanism of the roll paper feeding device using one large capacity drive motor.
By using one drive torque control means for the sheet conveying device, the structure of the drive mechanism can be simplified. Further, since the means for controlling the drive torque arranged with respect to the sheet conveying device is configured to transmit a relatively weak driving force, it is possible to sufficiently cope with a jam or the like in the sheet conveying path. Safety can be ensured for each mechanism that constitutes the drive system. Further, in the drive device of the present invention, even when a paper conveying device that requires a relatively small driving force is connected to a cutter device corresponding to a large-sized paper, an excessive driving force is applied to the paper conveying device. Since no force is applied, damage to the device can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an electronic copying machine of the present invention.

FIG. 2 is a side view showing a state in which the paper feeding device is separated from the main body of the electronic copying machine.

FIG. 3 is an explanatory diagram showing a configuration of a sheet feeding device of the present invention.

FIG. 4 is an explanatory diagram of a device arranged in a paper feed path.

FIG. 5 is an explanatory diagram of a drive device provided in the paper feeding device.

FIG. 6 is a side view showing the configuration of the torque limiter of the present invention.

FIG. 7 is a side view showing the configuration of another example of the torque limiter.

FIG. 8 is a side view showing the configuration of another example of the torque limiter.

[Explanation of symbols]

1 electronic copying machine, 10 paper feeding devices, 11-11
c roll paper, 12 to 12c nip roller unit, 13 to 13d paper transport path, 20 transport roller device, 25 cutter device, 27 registration roller device, 30 drive device, 31 drive motor, 3
2 Cutter drive device, 35 Output gear, 36
Idler gear, 37 sprockets, 40
Torque limiter, 41 friction plate, 50 ・ 60 ・ 7
0.80 roll paper drive.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Go Yamazaki 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Zero Tux Co., Ltd. Iwatsuki Plant

Claims (1)

[Claims] 1. A plurality of roll papers are accommodated in a roll paper feeding device which is detachably provided with respect to a main body portion provided with a mechanism for scanning an image of a document and performing image recording, In the image forming apparatus, a mechanism for merging a sheet conveying path for feeding the sheet from the roll sheet and cutting the sheet downstream of the merging portion, and a mechanism for cutting the sheet with the sheet conveying apparatus in an image forming apparatus Is separately provided, and a single motor is used to drive both devices, and a drive torque control device for the paper transport device is provided between the paper cutting mechanism and the drive system for the paper transport device. Drive device for the roll paper feeder.