JPH05323776A - Paper sheet feeder - Google Patents

Abstract

PURPOSE:To smoothly feed a paper sheet by using a single carrying roller in common, for pulling in the paper sheet in an individual paper sheet feeding mode, and sending out the paper sheet in a recirculating paper sheet feeding mode, and preventing a failure in the feeding of the paper sheet and its damage. CONSTITUTION:A paper sheets housing part 3 in which the paper sheets D are piled and housed and a paper sheet placing part 4 on which the paper sheets D are placed one by one, are provided closely to each other. The carrying roller 8 is provided at a position in the downstream side of both parts 3 and 4, and in the upstream side with respect to a processing location 9, and used in common by both parts 3 and 4, to carry the paper sheet D selected and supplied from one of both parts 3 and 4. A carrying belt 10 sucking/carrying the paper sheet D is provided at the processing location 9. When the paper sheet D is carried from the paper sheets housing part 3, the carrying roller 8 and the carrying belt 10 are driven in a high-speed range, and when the paper sheet D is carried from the paper sheet placing part 4, the carrying roller 8 and the carrying belt 10 are driven in a low-speed range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in, for example, a document feeding device of a copying machine. After the sheets of stacked documents are fed one by one to a processing position such as a reading position, It is possible to select a circulation type feeding mode in which the sheet is conveyed back and stored again in the sheet body storing section, or an individual type feeding mode in which the sheet body is individually fed to the processing position and then collected Sheet feeding device.

[0002]

2. Description of the Related Art An electrostatic copying machine capable of feeding paper in a circulating feeding mode and an individual feeding mode is known, and a conventional copying machine of this type is fed by a circulating feeding mode. In most cases, the manual feeding is the manual feeding method in the individual feeding mode except for setting the original.

[0003]

The conventional copying machine described above is
The feeding device in the circulating feeding mode and the feeding device in the individual feeding mode are formed by different mechanisms, and in the former feeding device, when documents are tidily stacked at a predetermined position, After that, since it is mechanically performed according to a predetermined order, it is possible to feed the sheet under high-speed operation.On the other hand, the latter sheet feeding device feeds the document each time by hand, so that the document is conveyed in the correct posture. It is not possible to operate at high speeds and low speeds are unavoidable.Therefore, the transport rollers corresponding to the circulating feeding mode operate in the high speed range, and the feeding rollers corresponding to the individual feeding mode are different. It is designed to operate in the low speed range by the drive system of and has a complicated structure. In addition, the transport belt for transporting the document provided at the reading position is connected to an independent drive system in order to constantly operate at high speed in correspondence with the circulation type feeding mode in the high speed range. Inevitability is inevitable.

An object of the present invention is to allow a single mechanism to perform sheet body retraction in the individual type sheet body feeding mode and sheet body feeding in the recirculating type sheet body feeding mode, and to carry out each of them. Provided is a sheet body feeding device which prevents a sheet feeding failure and a stain from occurring in advance and smoothly feeds the sheet body by performing speed control of high and low two speeds adapted to the case. Especially.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a circulation type sheet feeding for sequentially feeding sheets one by one from a stack stacked at a stacking position and passing them through a processing position to an original stacking position. A sheet body feeding device capable of switching between individual sheet body feeding for conveying the sheet bodies set for each sheet to the stacking position via the processing position, the sheet bodies being stacked at the stacking position. And a sheet body storage portion that is stored in close proximity to the sheet body storage portion
A sheet body placing portion to be placed on a sheet-by-sheet basis, the sheet body storing portion and the sheet body placing portion are on the downstream side with respect to the processing position and are provided on both portions at a position on the upstream side in common.
A conveyance roller that conveys a sheet body that is selectively fed out from one of them, a conveyance belt that is provided at the processing position and that adsorbs and conveys the sheet body that has passed through the conveyance roller, and a sheet body that is conveyed by the conveyance belt. A return conveyance path for returning the sheet to the sheet body storage section, a motor for driving the conveyance rollers and a motor for driving the conveyance belt, in a high speed range when the sheet body is conveyed from the sheet body storage section, A sheet body feeding device including a speed switching control means for switching to a low speed range and operating when the sheet is conveyed from the stacking portion.

[0006]

According to the present invention, the conveying roller is provided in common on the downstream side with respect to the sheet body accommodating portion and the sheet body placing portion, the speed is controlled by the speed switching control means together with the conveying belt on the downstream side, and the circulation type is used. In the sheet body feeding mode, the vehicle is operated in the high speed range, and in the individual type sheet feeding mode, it is operated in the low speed range. Therefore, the structure of the feeding device is simplified, and in the circulation type sheet feeding mode, the feeding is performed under the high speed driving, the high efficiency feeding is possible, and the individual type sheet feeding mode is also possible. At times,
Stable drawing of the sheet at low speed is performed,
Sheet contamination such as poor paper feeding and adhesion of roller marks is eliminated. Moreover, the speed relationship between the transport roller and the transport belt can be maintained at an appropriate speed regardless of whether the speed is high or low, and it is possible to prevent a paper feed accident such as a paper jam. ..

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a section of an original feeding device for a copying machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of a copying machine in which this feeding device is used. The copying machine includes the document feeding device 1 and the main body 2. Document feeder 1
Is a circulation type document feeding mode (hereinafter abbreviated as "RDH mode") of a trade-in / return type, and an individual type document feeding mode (hereinafter abbreviated as "SDF mode") of a manual sheet-by-sheet setting method. Is formed into a device capable of switching. In the RDH mode, the documents D stacked and accommodated in the sheet body accommodating unit 3 serving as the document accommodating unit are sequentially delivered from the document D at the lowermost position by the delivery belt 5 provided directly below the document accommodating unit 3. And the delivery belt 5
After passing between a pair of delivery rollers 6 and 6 provided on the downstream side of the sheet, after being conveyed by a conveying roller 8 through a conveying path 7, a processing position 9 realized at a reading position is reached and a conveying belt 10 transparently. The sheet is pressed against the plate 14, while being exposed in the exposure area by the light source 19, is conveyed by the conveyor belt 10 and is reversely conveyed by the paper feed roller 11, and then is returned by the return conveyance path 12 and the pair of return rollers 13 ,.
After passing through 13, the document is returned to the uppermost document D in the document storage unit 3.

The transport roller 8 is arranged immediately below the transport path 7 provided on the downstream side of the feed rollers 6 and 6, and is driven to rotate by a motor 15 having a shaft connected thereto, while reversing the document D. The sheet is conveyed to the reading position 9. At a position on the opposite side of the reading position 9 with the conveyance roller 8 in between, that is, at a position on the upstream side with respect to the conveyance direction of the conveyance roller 8, the document D is manually fed by 1
A sheet body placing section 4 which is a document placing section capable of placing sheets one by one is provided. The document placing section 4 is used when feeding in the SDF mode, and is placed on the document placing section 4.
The original document D is conveyed by the conveyance roller 8 and thereafter returned to the original document storage unit 3 through the same route as in the RDH mode, and the conveyance roller 8 plays the role of original conveyance in the RDH mode. In the SDF mode, it plays the role of pulling in the original and functions as a shared roller.

The conveyor belt 10 is stretched endlessly between a driving roller 17 which is rotationally driven by a motor 16 and a driven roller 18 which is provided so as to face the driving roller 17, and drives the motor 16. Is rotated in the direction of the arrow. The conveyor belt 10 is provided with a large number of ventilation holes, and faces an air suction duct (not shown) arranged in a space sandwiched between the rollers 17 and 18 by the conveyor belt 10. Since the suction port is opened so as to come into contact with the transport belt 10 running on the lower side from above, the transport belt 10 runs while receiving the suction action of the air suction duct, and the document D transported by the transport rollers 8 is conveyed. Can be conveyed to the side of the paper feed roller 11 under the condition that it is adsorbed and there is no slippage.

The main body 2 has a light source 19 inside, and an exposure region by the light source 19 is set corresponding to the transparent plate 14. The reflected light of the document from the exposure area is transmitted by the optical system 20.
Then, an image is formed on the photosensitive drum 21. Around the photosensitive drum 21, a charging device 22, a developing device 23, a transfer device 24, and the like are arranged.
Sheets of different types are fed to the transfer area 28 between the transfer device 24 and the photosensitive drum 21, and a document image by reflected light from the document D is recorded. Then, the recording paper after transfer is fixed by the fixing device 29 and directly stored in the paper discharge tray 30, or is bound into a predetermined number of sheets by the fastening device 31 and stored in the paper discharge tray 30. The copied recording paper is carried into the intermediate tray 32 by the carrying path 33, and is fed along the arrow A direction.

FIG. 3 is a block diagram showing the electrical construction of the copying machine. This copying machine includes a microcomputer 34 including, for example, a microprocessor, and the microcomputer 34 performs control according to a control program stored in advance in a ROM (Read Only Memory) 35. The cycle time according to the size and thickness of the recording paper, the air suction time with respect to the conveyor belt 10 and the conveyor time are also stored here, and are set in a timer (not shown) in the microcomputer 34 as necessary. A RAM (random access memory) 36 is a buffer memory, a flag required for copy control,
It is also used as a calculation area. As an example, a key switch including a copy start button, a copy magnification or a setting key for a copy member, a document sensor 37 provided in the document storage unit 3, and a sheet input sensor provided immediately downstream of the document placing unit 4 are provided. A signal input device 39 to which a signal such as a detection signal from the device 38 is input transfers the signal to the microcomputer 34 through an interface circuit (abbreviated as “I / O”) 40. That is, in the main body 2 of the copying machine, a detection signal of the conveyance position of the recording sheet, a signal of the position detection of the photoconductor, or an input signal by the key operation is
On the other hand, in the document feeding device 1, both the sensors 37,
The input signal of 38 is sent to the microcomputer 34 through the interface circuit 40.

Further, the copying magnification display, other display circuits, the respective motors and plungers of the main body 2, the transport roller motor 15, the drive roller motor 16 and the paper feed roller motor 41 in the document feeding apparatus 1 are included. A driver array 42 for controlling each load is provided, and the interface circuit 43 of the driver array 42 transfers the control signal from the microcomputer 34 to the driver array 42. Each of these elements is a microcomputer 3
Drive control is performed in association with each other by 4 to drive the main body 2 and the document feeding apparatus 1. It should be noted that, of the respective loads, the transport roller motor 15 and the drive roller motor 16
For example, an AC induction motor in which inverter control is performed by frequency conversion is used, and the PWM signal is used to change the duty ratio to a high-speed rotation or a low-speed rotation to perform constant-speed rotation control.

FIG. 4 shows a document feeding apparatus 1 according to the embodiment of the present invention.
3 is a flowchart illustrating the operation of the above. First, when the copy start button is pressed to start copying, in step a1, it is confirmed that the operation is being performed reliably, and then the process proceeds to step a2, in which the original sensor 37 is turned on, that is, the original is stored. The state in which the document D is stored in the section 3 is detected, and if it is on, the process proceeds to step a4, where R
In the DH mode, the operation of circulating the original and making a copy is started. At the next step a5, both the motors 15 and 16 are rotated at a high speed by the speed switching control means.

On the other hand, when the document sensor 37 is in the off state in step a2, the process proceeds to step a3, in which the sheet input sensor 38 is in the on state, that is, the document placing portion 4 is used for manual feeding. If the ON state is detected, and if it is ON, the operation proceeds to step a6 to start the individual copying operation in the SDF mode, and the operation proceeds to the next step a7 to rotate both the motors 15 and 16 at a low speed. ..

Further, when the paper feed sensor 38 is in the off state in step a3, it is neither a circulation type nor an individual type. Therefore, the process proceeds to step a8 to start the copy operation in the OC (open copy) mode. To do. This O
In the C mode, the document feeding apparatus 1 is pushed up by a hand to open it, and a copy operation which is normally performed such as placing a bound document such as a book face down on the transparent plate 14 is performed. In this way
In the operation of FIG. 4, the RDH mode is given the highest priority, then the SDF mode is given priority, and the copy operation is performed in the order of shifting to the OC mode.

[0016]

As described above, according to the present invention, in the case of the circulation type sheet feeding, highly efficient sheet feeding can be performed at high speed, while in the case of the individual type sheet feeding by manual feeding or the like. Since it is possible to feed the sheet body by pulling the sheet body in order at a low speed, it is possible to prevent the sheet feeding failure due to the oblique feeding, the wrinkle, and the stain.

Further, since the conveying roller is adapted to both the circulation type and the individual type feeding modes, there is an advantage that the apparatus can be compactly accommodated. Further, by simultaneously controlling the speeds of the conveying roller and the conveying belt, the speed can be controlled. The sheet material can be fed accurately and stably by synchronizing accurately.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a document feeder for a copying machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of a copying machine in which the embodiment shown in FIG. 1 is used.

3 is a block diagram showing an electrical configuration of the copying machine shown in FIG.

4 is a flowchart illustrating an operation of the document feeding apparatus 1 shown in FIG.

[Explanation of symbols]

 1 Document Feeding Device 3 Sheet Body Storage Section 4 Sheet Body Placement Section 8 Conveying Roller 9 Processing Position 10 Conveying Belt 12 Returning Conveying Path 15, 16 Motor 17 Driving Roller 18 Driven Roller 34 Microcomputer 39 Signal Input Device 40, 43 Interface circuit 42 Driver array

Claims (1)

[Claims] 1. A circulation type sheet body feeding for sequentially feeding sheets one by one from a stacking position at a stacking position and then transporting them to an original stacking position through a processing position, and a sheet body set for each sheet. A sheet body feeding device capable of switching between individual type sheet body feeding which conveys to the stacking position via the processing position, wherein the sheet body storage unit is provided at the stacking position, and the sheet bodies are stacked and stored. And a sheet body placing portion which is provided in the vicinity of the sheet body accommodating portion and on which the sheet bodies are placed one by one, and a downstream side with respect to the sheet body accommodating portion and the sheet body placing portion, and the processing position With respect to the upstream side with respect to the both sides, it is shared by both parts, and a conveying roller that conveys a sheet body that is selectively fed out from either one, and a sheet body that passes through the conveying roller and is provided at the processing position. Conveyor bell that sucks and conveys The sheet body is conveyed from the sheet body accommodating section by a return conveying path for returning the sheet body conveyed by the conveying belt to the sheet body accommodating section, a motor for driving the conveying roller and a motor for driving the conveying belt. The sheet body feeding device further includes a speed switching control unit that operates by switching to a high speed range when the sheet body is placed and a low speed range when the sheet body is conveyed from the sheet stacking unit.