JPH1045269A - Paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the skew feed of a sheet and surely execute the biting of the sheet to a sheet carrying means by controlling the drive of the sheet carrying means for a prescribed time at a first carrying speed lower than an estimated sheet inserting speed when a sheet is inserted to the sheet carrying means. SOLUTION: When an operator inserts a sheet P along a manual insertion tray 17, a manual insertion detecting switch 18 is ON. a CPU controls a main motor 25 at a first carrying speed on the basis of this signal, and also rotates a sheet carrying roller 19. This rotation is performed at the first carrying speed. Since the sheet carrying roller 19 is rotated at a speed lower than the speed of the sheet P, the sheet can be corrected to the state close to straightness in the part of the sheet carrying roller 19 even if sent obliquely to some degree. The straightly corrected sheet P is bitten into the sheet carrying roller 19, and carried at the fist carrying speed for a certain fixed time, and the carrying speed is switched to a second carrying speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device having a sheet conveying means for pinching and conveying a manually inserted sheet, which is arranged on the downstream side in the sheet conveying direction facing a manual feed opening.

[0002]

2. Description of the Related Art A copying machine using a conventional paper feeder is shown in FIG.
As shown in FIG. 2, when one sheet of paper P is transported to the paper feed tray by the operator, the manual feed detection switch is turned on. At this time, the main motor was immediately turned on, the main motor was rotated at a constant speed, the electromagnetic clutch 61 was turned on, and the paper P was conveyed while being bitten by the paper conveyance roller 62.

[0003] As a problem of the prior art, there is a high possibility that the paper P is fed obliquely at this time. Also, when the manual feed detection switch is turned on, the main motor rotates, and if the hand is separated from the paper P by the sound without being bitten by the paper transport roller 62, the paper P may fall out when the manual feed tray is small. there were.

The causes of the above-mentioned oblique feeding include the following points. When the operator guides the paper P diagonally to the paper transport roller 62 with respect to the paper transport roller 62, the paper transport roller that causes the paper P to bite more than the speed at which the operator transports the paper P to the paper feed tray This is because the transport speed of 62 is higher (for example, 88 mm / sec), so that one corner of the paper P bites into the paper transport roller first and is fed as it is. (If one side of the sheet P is in contact with and jams in parallel with the sheet conveying roller 62, no oblique feeding occurs.) This is when the sheet P is jammed more than the speed at which the operator transports the sheet P to the sheet feeding tray. Since the transport speed of the paper transport roller 62 is faster, the moment the paper P bites into the paper transport roller 62, the paper P is pulled and the diagonal feed occurs. As a result, the parallelism between the toner image on the drum and the image of the paper P is not obtained, and as a result, an oblique image is generated or a paper jam occurs.

[0005] In contrast to the above technique, a technique developed for the purpose of improving oblique feeding and the like is disclosed in Japanese Patent Publication No. 62-21697.
No. 6,086,045. That is, for example, when the sheet detector detects the sheet P set on the manual feed tray, the conveying device is operated after a predetermined time to convey the sheet P. Since the operation is started after a predetermined time, the insertion position and the insertion posture of the sheet can be corrected before the operation starts. If the paper P is removed within a predetermined time, the operation is stopped.

[0006]

In recent years, there has been a demand for miniaturization and space saving of the copying machine, and a manual feed tray has greatly affected the space of the copying machine. Under such circumstances, some manual feed trays are smaller than the paper size. In the case where the manual tray is small as described above, as described in Japanese Patent Publication No. 62-21697, in the case where the sheet P is inserted into the manual tray and the operation of the sheet conveying roller is started after a predetermined time, the operation is started before the operation starts. When the hand is released from the paper P, the paper P does not bite into the manual feed roller, and the paper P is not conveyed even when the operation is started. The paper P may fall from the manual feed tray.

[0007]

According to a first aspect of the present invention, there is provided a sheet feeding apparatus for nipping and conveying a manually inserted sheet, which is disposed downstream of a sheet feeding direction facing a manual feed opening. In a paper feeding device having a paper transporting means, when paper is inserted into the paper transporting means, a control means is provided for controlling the driving of the paper transporting means for a predetermined time at a first transporting speed lower than an assumed paper insertion speed. ing.

According to a second aspect of the present invention, there is provided a paper feeder, comprising: an aligning means disposed downstream of the paper transporting means in the paper transporting direction and transporting the paper in synchronization with a transfer timing to a transfer section; A paper detector arranged upstream in the transport direction, wherein the control means is arranged such that when the downstream end of the paper is located between the alignment means and the paper detector, When the downstream end of the sheet is detected in step (1), the transfer speed of the sheet transfer means is controlled to the second transfer speed for alignment.

According to a third aspect of the present invention, there is provided a paper feeder for detecting a manual feed tray which supports a sheet manually fed from the manual feed opening and which can be changed into a long state and a short state, and the long state and the short state of the manual tray. A tray state detector, wherein the control means sets a short time for driving the paper conveyance means at the first conveyance speed when the tray state detector detects a long state,
When the short state is detected, the driving of the sheet conveying means at the first conveying speed is set to a long time.

According to a fourth aspect of the present invention, there is provided a sheet feeding device, which is capable of supporting a sheet manually inserted from the manual insertion opening and which can be changed into a long state and a short state. Paper comparing means for comparing with the length of the manual feed tray, and the control means drives the paper transporting means at the first transport speed when the paper comparing means determines that the width of the paper is smaller than the length of the manual feed tray. When it is determined that the width of the sheet is large, the driving of the sheet conveying means at the first conveying speed is set to be long.

According to a fifth aspect of the present invention, in the paper feeding device, the paper transporting means includes a manual paper transporting section and a paper feeding section disposed downstream of the manual paper transporting section.
The transport speed of the manual paper transport unit is drive-controlled at the first transport speed, the transport speed of the paper feed unit is drive-controlled at the second transport speed, and when paper is jammed in the paper feed unit, the manual paper transport is performed. The control unit includes a pinching force control unit that releases the pinching of the sheet of the set or reduces the pinching force.

According to a sixth aspect of the present invention, in the sheet feeding device, the holding force control means includes a one-way clutch, and when the sheet is caught in the sheet feeding portion, the one-way clutch causes the manual sheet feeding portion to operate. The paper is driven by the paper being conveyed at the second conveyance speed by the paper supply unit.

According to a seventh aspect of the present invention, there is provided a sheet feeding device having a manual sheet feeding mode by the sheet feeding means and an automatic sheet feeding mode for automatically feeding sheets, and selecting the manual sheet feeding by the sheet feeding means. A manual selection key to be operated, the control means cancels the manual paper feed mode if paper is not manually inserted even after a certain time has elapsed after the operation of the manual selection key, and then the paper conveyance means is operated for a certain time. The operation is performed to detect the presence or absence of a sheet, and a copy operation is performed when a sheet is present.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A copying machine as an electrophotographic apparatus using a paper feeder according to the present invention has a document table 1 made of transparent glass or the like on the upper surface as shown in FIG. An exposure optical system 2 is arranged below the document table 1. The exposure optical system 2 uses an exposure light source (hereinafter, referred to as an exposure lamp) 3 composed of a halogen lamp for irradiating a document placed on the document table 1 with light and a reflected light from the document, for example, a one-dot chain line in FIG. As shown in the figure, a plurality of reflecting mirrors 4, 5, 5, which lead to an incident point A on a photoreceptor 10 disposed below the exposure optical system 2,
6, 7, and 8 and an imaging lens 9 disposed in the optical path of the reflecting mirror.

The photosensitive member 10 has a drum shape which is driven to rotate in the direction of the arrow. Around the photosensitive member 10, the surface of the photosensitive member 10 extends from an incident point A toward the rotating direction of the photosensitive member 10. A blank lamp unit 11 for removing voids and the like at the time of copying, and a developing device 1 for developing the surface of the photoreceptor 10 subjected to image exposure into a visible image
2. A transfer charger 13 for transferring the toner image on the photoconductor 10 to the paper P, a cleaning device 14 including a cleaning blade 14a for removing residual toner on the surface of the photoconductor 10, and a residual charge of the photoconductor 10 after cleaning. An electricity removing lamp 15 for removing electricity, a main charger 16 for charging the photoconductor 10 to a predetermined potential, and the like are provided in order.

A manual tray 1 for the operator to set the paper P is provided on the upstream side of the photoconductor 10 for transporting the paper P.
7, a manual feed detection switch 18 for detecting the paper P placed in the manual feed tray 17, a paper transport path roller 19 for transporting the paper P to the transfer charger 13, and a registration before detecting the paper P in front of a registration roller 20 described later. A registration roller 20 for adjusting the position of the paper P with the toner image on the photoreceptor 10 at the timing of the detection switch 21 and the exposure optical system 2 is provided, and the toner image is transferred to the downstream side of the conveyance. A fixing device 22 for fixing the toner image on the sheet P is arranged.

Further, below the photoreceptor 10, a paper cassette 23 containing paper P is disposed, and when a paper feed roller 24 disposed on the upper side of the paper cassette 23 rotates, a paper transport roller is provided. 19, the toner image formed on the surface of the photoconductor 10 is transferred to the paper P by the transfer charger 13 of the photoconductor 10, and the fixing device 22 fixes the toner image on the paper P to the paper P. A copy image is obtained.

The photoconductor 10, the developing device 12,
The paper transport roller 19, the paper feed roller 24, the registration roller 20, the fixing device 22, and the like are connected to a main motor 25 that rotates these components via gears, clutches, and the like. Normally, the photoreceptor 10 is rotated at a certain speed to obtain a copy image on the sheet P.

As shown in FIG.
The paper feed roller has an electromagnetic clutch 26 on its shaft, and is connected to the main motor 25 via a gear 27. The electromagnetic clutch 26 for the paper transport roller
It is controlled by a CPU that controls the copying machine.

The registration roller 20 has a registration roller electromagnetic clutch 28 on its shaft, and is connected to the main motor 25 via a gear 27. The registration roller electromagnetic clutch 28 is controlled by a CPU that controls the copying machine.

The manual feed detection switch 18 and the pre-registration detection switch 21 detect the paper P, respectively.
The on / off signal of this switch is input to the CPU which controls the copying machine, and is also used for the timing data of the on / off control of the electromagnetic clutches 26 and 28.

In the first embodiment, the paper transport roller 19 and the registration roller 20 have a first transport speed A and a second transport speed B (shown in FIG. 3). This is achieved by controlling the speed of the main motor 25.

When the operator inserts the paper P along the manual feed tray 17, the manual feed detection switch 18 is turned on. The CPU determines the main motor 2 based on this signal.
5 is controlled at the first transport speed A, and at the same time, the paper transport roller electromagnetic clutch 26 is turned on to rotate the paper transport roller 19. Of course, the rotation is the first transport speed A.

Since the paper transport roller 19 is rotating at a speed lower than the speed of the paper P inserted by the operator, even if the paper P is fed obliquely to some extent, it can be corrected to a state where the paper P is almost straight at the paper transport roller 19. It is. The straightened paper P bites into the paper transport roller 19 and is transported at a first transport speed A for a certain period of time, then switched to a second transport speed B (normal process speed) and transported.

The first transport speed A is lower than the speed at which the operator inserts the paper P along the manual feed tray 17. According to the experiment, the speed at which the operator inserts the paper P along the manual feed tray 17 is data as shown in the characteristic diagram of FIG. 4 and is about 50 mm to 350 mm per second. No one inserted at a speed of 49 mm / sec or less. Based on this experimental value, the first transport speed A was set to 49 mm / sec or less. By driving the paper transport roller 19 at this speed, the paper P can be aligned straight. In addition, if the conveying speed is about 49 mm / sec, in the case of a normal copying machine, the sound of the main motor 25 is small and quiet, and the hand is not suddenly released from the paper P by the sound (surprise).

The second transport speed B differs depending on the type of copying machine. For example, it is about 88 mm / sec for a machine that copies about 10 sheets per minute (depending on the type of copying machine).

The control block of the second embodiment will be described with reference to FIG. 5. This copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 18.
And the pre-registration detection switch 21 are connected.
The CPU 29 monitors the state (on / off) of the switches 18 and 21.

Further, the electromagnetic clutch 2 for the paper transport roller
6. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected. Furthermore, CPU2
9, a main motor controller 33 for controlling the rotation of the main motor 25 is connected.
When the PU 29 outputs the rotation speed data, the speed is controlled by the command.

Referring to FIG. 1, when the operator inserts the paper P along the manual feed tray 17, the manual feed detection switch 18 is turned on. The CPU 29 controls the main motor 25 at the first transport speed based on this signal, and simultaneously turns on the paper transport roller electromagnetic clutch 26 to rotate the paper transport roller 19. Of course, this rotation is the first transport speed.

Since the paper transport roller 19 is rotating at a speed lower than the speed of the paper P inserted by the operator, even if the paper P is fed obliquely to a certain extent, it is necessary to correct the paper P to a state that is nearly straight at the paper transport roller 19. Is possible. The straightened paper P bites into the paper transport roller 19 and is transported at a first transport speed for a certain period of time, then switched to a second transport speed (normal process speed) and transported.

For example, the distance from the manual feed detection switch 18 to the paper transport roller 19 is 10 mm, and the distance from the paper transport roller 19 to the second transport speed is 20 mm.
The speed of the sheet P is, for example, inserted at the slowest speed of 50 mm / second, which is manually inserted, and the first transport speed is 20 mm /
10/50 = 0.2 sec from the manual feed detection switch 18 to the paper transport roller 19, and 20 from the paper transport roller 19 to the distance at which the second transport speed is changed.
/ 20 = 1 sec, a total of 1.2 sec, that is, 1.2 second after the manual feed detection switch 18 is turned on, the conveyance is switched to the second conveyance speed and conveyed.

Then, the pre-registration detection switch 21 of the sheet P is turned on. The paper transport roller 19 is turned off at a fixed time after the pre-registration detection switch 21 is turned on. Since the leading end of the sheet P is stopped by the registration roller 20 and the sheet conveyance roller 19 is turned on for a certain period of time, the sheet P is bent between the registration roller 20 and the sheet conveyance roller 19.

This deflection is necessary for transferring the image on the photoreceptor 10 to the paper P at a proper position. This deflection is also necessary for the sheet P conveyed from the sheet cassette 23 of FIG. 1 and copied. Particularly, in a copying machine having a high sheet conveying speed capable of copying several tens of sheets per minute, the electromagnetic force for the registration roller is used. Reaction speed of clutch (several meters
sec to several tens of msec) greatly affects the amount of deflection of the paper P. Paper transport speed from manual feed and paper cassette 2
If the paper conveyance speed from the position No. 3 is different, the amount of deflection greatly changes, so that the resist changes at the time of transfer.

Therefore, in the second embodiment, the amount of deflection of the sheet P is adjusted by setting the second conveying speed before the sheet P that has passed through the sheet conveying roller 19 at the first conveying speed reaches the pre-registration detection switch 21. Can be made the same as the cassette, and the resist amount at the time of transfer can be made constant. This also eliminates the need for the CPU 29 to perform complicated control of the registration amount (timer for controlling the electromagnetic clutch 26 for the sheet transport roller). Thereafter, the registration roller 2 is synchronized with the timing of the exposure optical system 2 or the timing of the drum image.
When 0 is turned on (second transport speed), the image is transferred and fixed to obtain a copy.

The above operation will be described with reference to the flowchart of FIG. 6 (the flowchart of the portion according to the present embodiment will be limited to the description of the invention). When the power of the copying machine is turned on and the CPU 29 is started, warm-up or the like is performed. Pre-processing is performed. The manual feed detection switch 18 is turned on. That is, when the paper P is put into the manual feed tray 17, the main motor 25 is rotated at the first transport speed, and at the same time, the electromagnetic clutch 26 for the paper transport roller is turned on to rotate the paper transport roller 19 at the first transport speed.

Then, the contents of the timer A inside the CPU 29 are reset, and the timer A is started. The preset time B is compared with the content of the timer A, and when B = A, the main motor 25 is rotated at the second transport speed. The time B is the time (1.2 sec) from when the manual feed detection switch 18 is turned on to when the paper P is changed to the second transport speed, and the paper P is transported at the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is monitored, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is deflected by the value of the time D (time D is a time for setting the amount of deflection. Usually, it is several tens msec to several hundred msec. Timers A and C count up the time. Is what it is.).

Next, the registration roller electromagnetic clutch 28 is turned on at the timing of the start of the exposure optical system 2 or the timing of the image on the drum, and the registration roller 20 rotates at the second transport speed to transport the paper P in the second transport speed. Sent at speed. Thereafter, a fixing process and the like are performed, and a series of copying operations is completed.

The control block of the third embodiment will be described with reference to FIG. 7. This copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 18.
The pre-registration detection switch 21 and the manual tray length detection switch 34 required for this embodiment are connected. The CPU 29 monitors the states (on / off) of the switches 18, 21, and 34.

Further, the electromagnetic clutch 2 for the paper transport roller
6. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected. Furthermore, CPU2
9, a main motor controller 33 for controlling the rotation of the main motor 25 is connected.
When the PU 29 outputs the rotation speed data, the speed is controlled by the command.

FIG. 8 illustrates the manual feed length detecting section. The manual feed tray 17 includes two plates, a manual feed tray plate A35 and a manual feed tray plate B36, and a manual feed length detection switch. Bypass tray length detection switch 34
Are connected to the CPU 29.

The manual tray 17 is a manual tray plate A3.
5. The manual feed tray plate B36 can be rotated and folded about the connecting portion thereof, and when folded, the manual feed tray 17 is short, and when opened, the manual feed tray 17 is long. When the manual tray plate B36 is rotated and folded, the manual tray plate B3
6, the manual tray length detection switch 34 is turned on by a block 37 installed at one location.

When the manual feed tray 17 is in a short state, for example, when using the A4 size (A4 size 210 × 297 mm) or a larger size (longer feeding of a paper P of a larger size), the paper transport roller 1
The length from 9 to the tip of the manual feed tray 17 is 149m
m (half of 297 mm), and if the user releases the hand without the paper P being bitten by the paper transport roller 19, the paper P falls from the copier (when the manual tray 17 is long, the paper P No fall from 17).

Therefore, by setting the time at the first transport speed to be long enough before the paper P is securely engaged, the operator can reliably insert the paper P. When the manual tray 17 is long, the paper P does not fall, so that there is no problem even if the time at the first transport speed is shortened.

The above operation will be described with reference to the flowchart of FIG. 9 (the flowchart of the portion according to the present embodiment will be described only for the invention). When the power of the copying machine is turned on and the CPU 29 is started, warm-up is performed. Is performed. When the manual feed detection switch 18 is turned on, that is, when the paper P is put in the manual feed tray 17, the length of the manual feed tray 17 is detected in the state of the manual feed tray length detection switch 34. The manual tray length detection switch 34 is turned on (that is, the manual tray 1
7 is in a short state), the rotation time B of the paper transport roller 19 at the first transport speed is preset.

When the manual tray length detecting switch 34 is off (ie, when the manual tray 17 is in the long state), the rotation time B of the paper transport roller 19 at the first transport speed is preset. At this time, the time B is shorter in the long state than when the manual tray 17 is in the short state. For example, depending on the type of copier, when the manual tray length detection switch 34 is off (that is, when the manual tray 17 is in the long state), 0.5
When the manual feed tray length detection switch 34 is turned on (that is, the manual feed tray 17 is in a short state), 1.0 second
It is.

When the preset of the time B is completed,
The main motor 25 is rotated at the first transport speed. At this time, the paper transport roller electromagnetic clutch 26 is turned on to rotate the paper transport roller 19 at the first transport speed. C
The contents of the timer A inside the PU 29 are reset and the timer is started. The preset time B is compared with the content of the timer A. When B = A, the main motor 25 is rotated at the second transport speed to transport the paper P at the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is detected, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is deflected by the value of the time D (the time D is a time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 28 is turned on at the timing of the start of the exposure optical system 2 or the timing of the image on the drum, and the registration roller 20 rotates at the second conveyance speed to transfer the paper P to the second conveyance. Sent at speed. Thereafter, a fixing process and the like are performed, and a series of copying operations is completed.

The control block of the fourth embodiment will be described with reference to FIG. 10. This copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 1.
8, a pre-registration detection switch 21, a manual tray length detection switch 34, and a paper width detection switch 38 required for the present embodiment are connected. The CPU 29 monitors the status (on / off) of the manual tray length detection switch 34 and the paper width detection switch 38.

Also, the electromagnetic clutch 2 for the paper transport roller
6. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected. Furthermore, CPU2
9, a main motor controller 33 for controlling the rotation of the main motor 25 is connected.
When the PU 29 outputs the rotation speed data, the speed is controlled by the command.

Referring to FIG. 11, the structure of the manual feed tray 17 will be described. The manual feed tray 17 has the same structure as that of FIG. 8 (manual feed tray length detecting mechanism) and a paper width detecting mechanism. The manual tray detection mechanism is the same as in the third embodiment, and a description thereof will be omitted.

The paper width detecting mechanism will be described in detail. The manual feed tray 17 is provided with a width regulating plate 39 for detecting the width of the paper P. The width regulating plate 39 is used for the manual feed tray 17.
The upper side can be slid, and the width of the paper P is regulated by the slide. At the same time, the width of the paper P is detected by the width detection board 41 of the paper P stored in the paper width detection board storage section 40 below the width regulating plate 39. Is detected.

As shown in FIG. 12, a small magnet 42 is mounted below the width regulating plate 39 for detecting the paper width. A width detection board 41 is fixed below the magnet 42. Various paper widths (B5, A
(4, B4).
3b and 43c are fixed, and the contacts of the reed switches 43a, 43b and 43c corresponding to the positions of the magnets 42 are closed. Therefore, the time (timer) of the first transport speed can be determined by the CPU 29 detecting that the read switches 43a, 43b, 43c corresponding to the width size of the paper P are closed. Paper P
Is generally unified for the A-size series and the B-size series, and the size is determined. B5 (182 × 257), A
4 (210 × 297) and B4 (257 × 364).

In the fourth embodiment, the paper size is determined by detecting the width of the paper P, and the length of the paper size is compared with the length of the manual feed tray 17. By reducing the speed time, the time required for copying is reduced. In addition, manual tray 1
When the number 7 is short, the time of the first conveyance speed is lengthened to ensure that the sheet P bites into the sheet conveyance roller 19.

For example, as shown in FIG. 13, in the case of the present copying machine (maximum copy size B4), the manual tray 17 is short from the center of the paper transport roller 19 (the manual tray length detection switch 34 is on). Was set to 257 mm (length of B5 size: 257 mm).

In this copying machine, at 257 mm, when the paper P is not bitten by the paper transport roller 19, the paper P of B4 falls from above the manual feed tray 17 (B4 is 364 mm for the tray length of 257 mm, 107mm
Protrudes from the manual feed tray 17. This protruding 10
The portion of 7 mm hangs down from the manual feed tray 17 and, as a result, hangs down from the manual feed tray 17).

In the case of A4 size, although the length is 297 mm, it remains on the manual feed tray 17 and does not fall off the manual feed tray 17. This is because most of the A4 paper remains on the manual feed tray 17 and only 40 mm protrudes from the manual feed tray 17 so that it does not hang down from the manual feed tray 17 and does not fall. Therefore,
In the case of the B4 size, the time of the first transport speed is increased in order to ensure that the paper transport roller 19 is bitten.

In the case of the present copying machine (maximum copy size B
4) The length from the center of the paper transport roller 19 to the end of the long manual feed tray 17 (the manual feed tray length detection switch 34 is in the OFF state) was set to 364 mm (equivalent to the B4 size length of 364 mm). Thereby, the first
The time for the transport speed could be shortened, and the time for copying could be shortened.

The above operation will be described with reference to the flowchart of FIG. 14 (the flowchart of the present embodiment will be described only for the invention). When the power of the copying machine is turned on and the CPU 29 is started, warm-up and the like are performed. Is performed. Manual feed detection switch 18
Is turned on. That is, when the paper P is put in the manual feed tray 17, the CPU 29 detects the paper width of the manual feed tray 17.

First, it is determined whether or not the sheet width of the manual feed tray 17 is B4. In the case of B4, it is detected whether or not the manual tray length detection switch 34 is turned on. And
If it is on, it is determined that the bypass tray 17 is short,
The first transport speed time B of the paper transport roller 19 is preset (this time is longer than the preset time B described later). If it is off, it is determined that the manual feed tray 17 is long, and the first transport speed time B of the paper transport roller 19 is preset (this time is the preset time B).
Shorter).

In cases other than B4, it is determined whether or not the sheet width of the manual feed tray 17 is A4 or B5. A4 or B5
In this case, the time B (short) of the sheet transport roller 19 is preset. If the CPU 29 cannot detect the paper width, the preset value B (long) is set so that the paper P can be bitten by the paper transport roller 19 in any size.
Is set. The preset value B when A4 or B5 is smaller than the preset value B when the manual feed tray 17 is short at B4. For example, it is 0.5 sec for A4 and B5 sizes, and 1.0 sec for B4 or unknown sizes.

When the presetting of the time B is completed, the main motor 25 is rotated at the first transport speed. At this time, the paper transport roller electromagnetic clutch 26 is turned on to rotate the paper transport roller 19 at the first transport speed. The contents of the timer A inside the CPU 29 are reset and the timer is started. The preset time B is compared with the content of the timer A, and when B = A, the main motor 25 is rotated at the second transport speed. The paper P is transported at the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is detected, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is bent by the value of the time D (the time D is the time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 28 is turned on at the timing of the start of the exposure optical system 2 or the timing of the image on the drum, and the registration roller 20 rotates at the second transport speed to transport the paper P in the second transport mode. Sent at speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

The control block of the fifth embodiment will be described with reference to FIG. 15. In this copying machine, a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine are stored. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 1.
8 and the pre-registration detection switch 21 and the paper path detection switch 44 are connected.

Further, the sheet conveying roller N electromagnetic clutch 4
5. A driver 32 for driving a solenoid (pressure release solenoid 46) for releasing the pressure of the registration roller electromagnetic clutch 28 and the sheet transport roller 19 is connected.

Further, the CPU 29 has a main motor 2
5 is connected to a main motor controller 33 (not shown) for controlling the rotation of the motor 5. When the CPU 29 outputs a motor on / off command, the speed is controlled by the command. Therefore, the rotation speed of the main motor 25 this time is only one rotation speed of the second transport speed. However, the paper transport roller 17 is set to the first transport speed by an appropriate gear ratio.

Referring to FIG. 16, the structure of the copying machine according to the present embodiment will be described. A registration roller 20, a paper transport roller N47 upstream of the registration roller 20, and a paper transport roller 19 upstream thereof are arranged. The main motor 25 is designed to rotate at a certain speed, and the registration roller 20 and the paper transport roller N47 rotate at a fixed second transport speed.

The paper transport roller 19 is mechanically connected at an appropriate gear ratio so as to rotate at a fixed first transport speed. In addition, the paper transport roller 19 includes
The pressure release solenoid 46 is mechanically connected and the CPU
29, the paper transport roller 1 when turned on
The pressing force between the sheets 9 and 19a is released, and the conveying force of the sheet P is reduced.

17, a driving force is transmitted to the paper P, because the upper and lower paper transport rollers 19 and 19a are normally in pressure contact with each other. When the pressure release solenoid 46 is turned on, the lower sheet conveying roller 19a moves downward, and a gap is formed between the upper and lower sheet conveying rollers 19, 19a, and the driving force is lost. Thereby, the paper P is transported by the paper transport roller N47, and can be transported at the second transport speed.

The above operation will be described with reference to the flowchart of FIG. 18 (the flowchart of the present embodiment will be described only for the invention). When the power of the copying machine is turned on and the CPU 29 is started, warm-up is performed. Is performed. When the manual feed detection switch 18 is turned on, that is, when the paper P is put in the manual feed tray 17, the main motor 25 is rotated at a fixed fixed speed. At this time, the paper transport roller electromagnetic clutch 26 is turned on to rotate the paper transport roller 19 at the first transport speed.

When the paper P passes through the paper transport roller 19 (at this time, the transport speed of the paper P is the first transport speed) and turns on the paper path detection switch 44, the timer E is reset and started. When the counted time reaches the set time F, that is, when the sheet P bites into the sheet conveyance roller N47 (the set time F is 10 mm between the sheet conveyance roller 19 and the paper path detection switch 44 and the first conveyance speed Is 20 mm / sec, 10/20 = 0.5 sec
In c), the pressure release solenoid 46 is turned on to release the transport force of the paper P of the paper transport roller 19, and the transport of the paper P is performed by the paper transport roller N47. At this point, the paper P automatically reaches the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is detected, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and started, and is compared with a preset time D. When D = C, the paper transport roller N is turned off. At this time, paper P
Is given by the value of time D (time D is the time for setting the amount of deflection).

Next, at the start timing of the exposure optical system 2 or the timing of the image on the drum, the registration roller electromagnetic clutch 28 and the paper conveyance roller N electromagnetic clutch 45 are turned on, and the registration roller 20 and the paper conveyance roller N47 are turned on. The paper P rotates at the second transport speed and is fed at the second transport speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

The control block of the sixth embodiment will be described with reference to FIG. 19. The copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 1.
8 and the pre-registration detection switch 21 are connected.

Also, the paper transport roller N for mechanically turning on / off the paper transport roller N47 has an electromagnetic clutch 4
5. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected.

Further, the CPU 29 has a main motor 2
5 is connected to the main motor controller 33 for controlling the rotation of the motor 5.
When an OFF command is output, the speed is controlled by the command. Therefore, the rotation speed of the main motor 25 this time is only one rotation speed of the second transport speed. However, the paper transport roller 19 is driven to rotate at the first transport speed by an appropriate gear ratio. The paper transport roller 19 has a one-way clutch 48 connected on its axis.

The one-way clutch 48 is a one-way clutch, which transmits a driving force (rotates the roller shaft) for a torque from one direction, and a (minus) torque in the opposite direction (by the paper P). It has the characteristic of cutting off the driving force against the torque that the roller is pulled.)

As shown in FIG. 20, when rotation (right rotation in FIG. 20) is transmitted from the gear 49 of the main motor 25 to the clutch gear 51 via the gear 50, the one-way clutch 48 also moves the guide case 52 to the right. , And the bearing 53 housed in the guide case 52 (to be described with the bearing 53 denoted by a reference numeral).
Move to the left relative to.

Since the guide case 52 is provided with a groove 54 which becomes shallower toward the left side in FIG. 20, the space formed by the guide case 52 and the sheet conveying roller shaft 55 in the groove 54 is on the left side. The bearing 53 gradually becomes narrower, and the bearing 53 is sandwiched between the inner wall of the groove 54 and the outer peripheral wall of the sheet conveying roller shaft 55. Since a plurality of bearings 53 are provided, each of them performs the same operation, whereby the paper transport roller shaft 55 is eventually tightened, and the clutch gear 51 of the one-way clutch 48 is rotated.
The paper transport roller shaft 55 rotates in the same direction as the rotation direction.

Conversely, when the paper transport roller shaft 55 is pulled by the paper P at the second transport speed, the clutch gear 51
20, the bearing 53 moves to the right in FIG. 20, the tightening of the paper transport roller shaft 55 is eased, the bearing 53 becomes rotatable, and the paper transport roller shaft 55 is rotated. 55
Can rotate at the second transport speed.

The structure of the copying machine according to the present embodiment will be described with reference to FIG. 21. A registration roller 20, a paper transport roller N47 upstream thereof, and paper transport rollers 19 and 19a upstream thereof are arranged. Main motor 2
5 is designed to rotate at a certain speed, and the registration roller 20 and the paper transport roller N47
It rotates at a fixed transport speed.

The paper transport roller 19 is mechanically connected at an appropriate gear ratio so as to rotate at a fixed speed of the first transport speed. A one-way clutch 48 is mounted on the paper transport roller shaft 55 of the paper transport roller 19, and driving from the main motor 25 side passes through the one-way clutch 48 and is driven to the paper transport roller 19 (therefore, the paper P). (First transport speed) is transmitted.

Conversely, the speed of the paper P is high (the paper P is transported at the second transport speed by the paper transport roller N47).
And the one-way clutch 48 connected to the paper transport roller 19 cuts off the drive.

The above operation will be described with reference to the flowchart of FIG. 22 (the flowchart of the present embodiment is a flowchart of the present invention, so only the invention will be described). When the power of the copier is turned on and the CPU 29 is started, warm-up is performed. Is performed. Manual feed detection switch 18
Is turned on. That is, when the paper P is put into the manual feed tray 17, the main motor 25 is rotated at a fixed fixed speed. At this time, the paper transport roller 19 rotates at the first transport speed via the one-way clutch 48.

The paper P passes through the paper transport roller 19 (at this time, the transport speed of the paper P is the first transport speed), and when the paper P bites into the paper transport roller N47, the paper P reaches the second transport speed. Conveyed. The paper transport roller 19 is driven by the paper transport roller N47 for the second transport because of the first transport speed.
The paper P being conveyed at the conveyance speed is pulled by the one-way clutch 48, and at the second conveyance speed, the paper P is pulled by the two paper conveyance rollers 19 and 47 and is torn. The problem goes away.

Thereafter, the state of the pre-registration detection switch 21 is detected, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and started, and is compared with a preset time D. When D = C, the paper transport roller N47 is turned off. At this time, the sheet P is deflected by the value of the time D (the time D is a time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 28 and the paper conveyance roller N electromagnetic clutch 45 are turned on at the timing of starting the exposure optical system 2 or the timing of the image on the drum, and the registration roller 20 and the paper conveyance roller N47 are turned on. The paper P rotates at the second transport speed and is fed at the second transport speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

The control block of the seventh embodiment will be described with reference to FIG. 23. This copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 further includes a manual feed detection switch 1.
8, a pre-registration detection switch 21 and a paper path detection switch N56 are connected. The CPU 29 monitors the states (on / off) of the switches 18, 21, and 56.

Further, the electromagnetic clutch 2 for the paper transport roller
6. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected. Furthermore, CPU2
9, a main motor controller 33 for controlling the rotation of the main motor 25 is connected.
When the PU 29 outputs the rotation speed data, the speed is controlled by the command.

The structure of the copying machine according to the present embodiment will be described with reference to FIG. 24. When the operator inserts the paper P along the manual feed tray 17, the manual feed detection switch 18 is turned on. The CPU 29 determines the main motor 25 based on this signal.
Is controlled at the first transport speed, and at the same time, the electromagnetic clutch 28 for the paper transport roller is turned on, and the paper transport roller 1 is turned on.
Rotate 9 Of course, rotation is the first transport speed.

Therefore, since the paper transport roller 19 is rotating at a speed lower than the speed of the paper P inserted by the operator, it is necessary to correct the paper P to be almost straight at the paper transport roller 19 even if the paper P is fed at an angle. Is possible. The straightened paper P bites into the paper transport roller 19 and is transported as it is, and the paper path detection switch N56
Turn on. After turning on the paper path detection switch N56, the paper is switched to the second transport speed (normal process speed) and transported.

The sheet of paper P will be detected before the registration switch 2
Turn 1 on. The paper transport roller 19 is turned off at a fixed time after the pre-registration detection switch 21 is turned on.

Accordingly, the leading end of the paper P is stopped by the registration roller 20. Since the paper transport roller 19 for a fixed time is on, the registration roller 2
Deflection can be made between 0 and the paper transport roller 19.
This deflection is necessary for transferring the image on the photoconductor 10 to the paper P at a regular position.

This deflection is also necessary for the sheet P conveyed from the sheet cassette 23 of FIG. 2 and copied.
In particular, in a copying machine having a high sheet conveyance speed capable of copying several tens of sheets per minute, the reaction speed (several msec to several tens msec) of the registration roller electromagnetic clutch 28 greatly affects the amount of deflection of the paper P. If the paper transport speed from the manual feed tray 17 and the paper transport speed from the paper cassette 23 are different, the amount of deflection greatly changes, so that the resist changes during transfer.

Therefore, in the seventh embodiment, the sheet P that has passed through the sheet conveyance roller 19 at the first conveyance speed is set to the second conveyance speed before coming to the pre-registration detection switch 21, whereby the deflection of the sheet P is performed. The amount can be made the same as that of the paper cassette 23, and the amount of registration at the time of transfer can be made constant. This also eliminates the need for the CPU 29 to perform complicated control of the registration amount (timer for controlling the electromagnetic clutch 26 for the sheet transport roller).

Thereafter, the registration roller 20 is turned on (second conveyance speed) in synchronization with the timing of the exposure optical system 2 or the timing of the drum image, and the image is transferred, fixed, and a copy is obtained.

The above operation will be described with reference to the flowchart of FIG. 25 (it is a flowchart of the portion according to the present embodiment, so only the invention portion will be described). When the power of the copying machine is turned on and the CPU 29 is started, warm-up or the like is performed. Is performed. Then, when the manual feed detection switch 18 is turned on, that is, when the paper P is put in the manual feed tray 17, the main motor 25 is rotated at the first transport speed, and at the same time, the electromagnetic clutch 26 for the paper transport roller is turned on and the paper transport roller is turned on. 19 is rotated at the first transport speed.

When the paper P passes through the paper transport roller 19 and turns on the paper path detection switch N56, the CPU 29 immediately rotates the main mook 25 at the second transport speed. The paper P is transported at the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is detected, and when the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is deflected by the value of the time D (the time D is a time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 28 is turned on at the start timing of the exposure optical system 2 or the timing of the image on the drum, and the registration roller is turned on.
The roller 20 rotates at the second transport speed, and the paper P is sent at the second transport speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

The control block of the eighth embodiment will be described with reference to FIG. 26. This copying machine stores a CPU 29 (control means for each clutch) as main control means of the copying machine and a program for controlling the copying machine. ROM 30 and a RAM 31 serving as a work area for executing a program. The CPU 29 is further connected to an operation panel 57 on which an operator sets conditions such as the number of copies, and monitors whether the manual feed tray 17 required for the present embodiment is selected.

The pre-registration detection switch 21 is also connected, and the CPU 29 also monitors the state (on / off) of the switch 21.

Further, the electromagnetic clutch 2 for the paper transport roller
6. A driver 32 for driving the registration roller electromagnetic clutch 28 is connected. Furthermore, CPU2
9, a main motor controller 33 for controlling the rotation of the main motor 25 is connected.
When the PU 29 outputs the rotation speed data, the speed is controlled by the command.

The structure of the copying machine according to the present embodiment will be described with reference to FIG. 27. The operator selects the manual feed tray 17 by using the cassette selection switch 58 on the operation panel 57 as shown in FIG. If selected, bypass tray LED
Indicated by 59.

Then, the CPU 29 controls the main motor 25 at the first transport speed based on this signal, and simultaneously turns on the paper transport roller electromagnetic clutch 26 to rotate the paper transport roller 19. Of course, rotation is the first
The transport speed. The operator causes the paper P to bite into the paper transport roller along the manual feed tray.

Since the paper transport roller is rotating at a speed lower than the speed of the paper P inserted by the operator, it is possible to correct the paper P at a position near the paper transport roller 19 even if the paper P is fed obliquely to some extent. is there. The straightened paper P bites into the paper transport roller 19 and is transported at a first transport speed for a certain period of time, then switched to a second transport speed (normal process speed) and transported.

The paper P is soon detected before the registration switch 2
Turn 1 on. After turning on the pre-registration detection switch 21,
After a predetermined time, the paper transport roller 19 is turned off. The leading end of the sheet P is stopped by the registration roller 20, and the sheet conveyance roller 19 is turned on for a predetermined time, so that the sheet P is bent between the registration roller 20 and the sheet conveyance roller 19. This deflection is necessary for transferring the image on the photoconductor 10 to the paper P at a regular position.

Thereafter, in synchronization with the timing of the exposure optical system 2 or the timing of the drum image, the registration roller 20 is turned on (second conveyance speed), and the image is transferred and fixed to obtain a copy.

The above operation will be described with reference to the flowchart of FIG. 29 (the flowchart of the present embodiment is a flowchart of the present invention, so only the description of the invention will be made). When the power of the copying machine is turned on and the CPU 29 is started, warm-up is performed. Is performed. The operator operates the operation panel 5
7 by the cassette selection switch 58
Select 7. Then, the CPU 29 sets the main motor 2
5 is rotated at the first transport speed, and at the same time, the electromagnetic clutch 26 for the paper transport roller is turned on and the paper transport roller 19 is turned on.
Is rotated at the first transport speed.

The contents of the timer A inside the CPU 29 are reset and the timer is started. The preset time B is compared with the contents of the timer A, and B = A
Then, the main motor 25 is rotated at the second transport speed. The paper P is transported at the second transport speed.

Thereafter, the state of the pre-registration detection switch 21 is detected. When the pre-registration detection switch 21 for the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is deflected by the value of the time D (the time D is a time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 8 is turned on at the start timing of the exposure optical system 2 or the timing of the image on the drum, the registration roller 20 rotates at the second transport speed, and the paper P is transported in the second transport speed. Sent at speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

Since the configuration of the ninth embodiment is the same as that of the above-described eighth embodiment, its operation will be described with reference to the flowchart of FIG. 30 (it is only a description of the inventive portion because it is a flowchart according to the present embodiment). When the power of the copying machine is turned on and the CPU 29 starts, pre-processing such as warm-up is performed. The operator operates the operation panel 5
7 by the cassette selection switch 58
Select 7.

Then, the CPU 29 sets the main motor 25
Is rotated at the first transport speed, and at the same time, the paper transport roller electromagnetic clutch 26 is turned on to rotate the paper transport roller 19 at the first transport speed. Manual feed tray 1 by operator
Even if 7 is selected, if the paper P is not actually inserted, the operation at the first transport speed is prevented forever,
Reset and start timer G.

Thereafter, the state of the pre-registration detection switch 21 is detected, and if the pre-registration detection switch 21 of the sheet P is not turned on, the paper P is rotated at the first transport speed for a predetermined time (a preset time H). Then, the state of the pre-registration detection switch 21 is detected. If the pre-registration detection switch 21 does not turn on even after the time H has elapsed, the main motor 25 is stopped, the electromagnetic clutch 26 for the sheet conveying roller is turned off, and the process returns to the copy standby state.

When the paper P pre-registration detection switch 26 is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is deflected by the value of the time D (the time D is a time for setting the amount of deflection).

Next, the registration roller electromagnetic clutch 28 is turned on at the start timing of the exposure optical system 2 or the timing of the image on the drum, the registration roller 20 rotates at the second transport speed, and the paper P is transported by the second transport speed. Sent at speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

Since the configuration of the tenth embodiment is the same as that of the above-described eighth embodiment, its operation will be described with reference to the flowchart of FIG. When the power of the copying machine is turned on and the CPU is started, preprocessing such as warm-up is performed. The operator operates the operation panel 57
Manual tray 17 by the cassette selection switch 58 of FIG.
Select

Then, the CPU 29 sets the main motor 25
Is rotated at the first transport speed, and at the same time, the paper transport roller electromagnetic clutch 26 is turned on, and the paper transport roller 19 is rotated at the first transport speed. Even if the manual tray 17 is selected by the operator, if the paper P is not actually inserted, the timer G is reset and started in order to prevent the operation at the first transport speed forever.

Thereafter, the state of the pre-registration detection switch 21 is detected, and if the pre-registration detection switch 21 is not turned on for the sheet P, a predetermined time (a preset time H. H is the time of the sheet P of the copying machine). It depends on the length of the transport path and the second transport speed (process speed), generally several seconds.
To several tens of seconds. 4) is rotated at the first transport speed to detect the state of the pre-registration detection switch 21.

Even if the time H has passed, the pre-registration detection switch 2
If 1 does not turn on, stop main motor 25,
The electromagnetic clutch 26 for the sheet conveying roller is turned off, and the main motor 25 and the clutch 26 for the sheet conveying roller are turned off.

At this time, there is a possibility that the sheet P is possibly inserted from the manual feed tray by the operator and stopped between the manual feed tray 17 and the pre-registration detection switch 21. (In such a case, this may occur in the ninth embodiment.) In such a case, in order to prevent the copying machine from stopping, the main motor 25 once stopped is restarted at the first transport speed after a lapse of J seconds. Let it. Of course, the electromagnetic clutch for the paper transport roller is also turned on. J
The reason for starting the operation after a few seconds (generally after a few seconds) is that once the operation is stopped,
This is to prevent the insertion.

Thereafter, the timer K is reset and started. The state of the pre-registration detection switch 21 is monitored again, and the off state is Lsec (the time obtained by dividing the distance between the paper conveyance roller and the pre-registration detection switch 21 by the first conveyance speed, that is, the paper P The time for transporting to the front detection switch 21.) If this is continued, the copying machine returns to the copy standby state. When the pre-registration detection switch 21 is in the ON state, that is, when the pre-registration detection switch 21 of the sheet P is turned on, the timer C is reset and compared with a preset time D. When D = C, the paper transport roller 19 is turned off. At this time, the sheet P is bent by the value of the time D (time D).
Is the time to set the amount of deflection. ).

Next, the registration roller electromagnetic clutch 28 is turned on at the timing of the start of the exposure optical system 2 or the timing of the image on the drum, and the registration roller 20 rotates at the second transport speed to transport the paper P in the second transport speed. Sent at speed. Thereafter, a fixing process or the like is performed, and a series of copying operations is completed.

[0127]

According to the first aspect of the present invention, when a sheet is inserted into the sheet conveying means, the sheet conveying means is driven and controlled at the first conveying speed lower than the sheet inserting speed of the operator for a predetermined time. Even if the paper is inserted obliquely, the insertion angle of the paper is corrected before the leading edge abuts on the paper transport means and is transported. Can be reliably performed.

According to a second aspect of the present invention, when the downstream end of the paper is located between the alignment means and the paper detector, or when the downstream end of the paper is detected by the paper detector. Then, since the transport speed of the paper transport unit is controlled to the second transport speed for alignment, for example, the paper placed in a tray or the like is automatically transported separately from the paper transport unit that sandwiches and transports the manually fed paper. Even if it has a carrying means to perform the alignment, it is possible to stabilize the amount of deflection for alignment within a certain range by setting the carrying speed of both carrying means to the same speed when reaching the aligning means. It is possible to easily use both transfer means without performing complicated control for making the amount of deflection for alignment constant in the transfer means.

According to a third aspect of the present invention, when the manual tray is in the long state, the driving of the sheet conveying means at the first conveying speed is short, and when the manual tray is in the short state, the driving of the sheet conveying means is long. When the manual feed tray is in the short state, the predetermined time of the first transport speed is set to be relatively long, so that the time for suppressing the sound of the entire apparatus can be lengthened. When the user inserts the sheet into the transporting means, the user is not surprised (misunderstanding that the paper transport has started) and does not release his hand, so that the paper can be reliably caught in the paper transporting means.

When the manual tray is in the long state, even if the predetermined time of the first transport speed is relatively short, the manual tray is long, so that the paper does not fall from the manual tray and the paper is reliably caught in the paper transport means. In addition, although a long sheet takes a long time to convey the sheet, the time required for the sheet conveyance can be shortened by making the predetermined time of the first conveyance speed relatively short.

In the paper feeder according to the fourth aspect, when it is determined that the width of the paper is smaller than the length of the manual feed tray, the driving of the paper transport means at the first transport speed is shortened, and the width of the paper is reduced. Is determined to be large, the driving of the paper conveying means at the first conveying speed is set to a long time, so that the paper can be reliably prevented from dropping from the manual feed tray.
The time required for paper transport can be shortened.

According to a fifth aspect of the present invention, in the paper feeder, the transport speed of the manual paper transport unit of the paper transport unit is drive-controlled at the first transport speed, and the transport speed of the paper feed unit is drive-controlled at the second transport speed.
When paper is jammed in the paper feed unit, the paper feed of the manual paper feed unit is released or the gripping force is reduced, so there is no need to switch the drive speed of the paper feed unit, simplifying device control. Can be

In the paper feeding device according to the present invention, when the paper is caught in the paper feeding unit, the one-way clutch operates to move the manual paper feeding unit to the paper being transported at the second feeding speed by the paper feeding unit. Since it is driven, it is possible to release or reduce the holding force on the sheet with a simple structure.

In the paper feeder according to the present invention, if no paper is manually inserted after a predetermined time has passed after the manual selection key is scanned, the manual paper feed mode is canceled, and thereafter, the paper transport means is fixed. The printer is operated for a while to detect the presence or absence of paper, and a copy operation is performed when paper is present.Therefore, if paper is not inserted in the paper transport means, and paper is present in the transport path, The paper can be transported reliably, and waste of paper and occurrence of jam can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a copying machine using a sheet feeding device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a driving portion such as a clutch according to the paper feeding device of the present invention.

FIG. 3 is a characteristic diagram illustrating a sheet conveying speed according to the present invention.

FIG. 4 is a characteristic diagram showing a ratio of a sheet insertion speed in a manual feed tray.

FIG. 5 is a control block diagram of a sheet feeding device according to a second embodiment of the present invention.

FIG. 6 is a flowchart of a sheet feeding apparatus according to a second embodiment of the present invention.

FIG. 7 is a control block diagram of a sheet feeding device according to a third embodiment of the present invention.

FIG. 8 is a perspective view illustrating a manual feed tray according to a third embodiment of the paper feeding apparatus of the present invention.

FIG. 9 is a flowchart of a sheet feeding device according to a third embodiment of the present invention.

FIG. 10 is a control block diagram of a sheet feeding device according to a fourth embodiment of the present invention.

FIG. 11 is a perspective view illustrating a manual feed tray according to a fourth embodiment of the paper feeding apparatus of the present invention.

FIG. 12 is a perspective view showing the paper width detection switch of FIG. 11;

FIG. 13 is an explanatory diagram illustrating a relationship between the length of a manual feed tray and a sheet according to a fourth embodiment of the sheet feeding apparatus of the present invention.

FIG. 14 is a flowchart of a sheet feeding apparatus according to a fourth embodiment of the present invention.

FIG. 15 is a control block diagram of a sheet feeding device according to a fifth embodiment of the present invention.

FIG. 16 is a schematic sectional view of a copying machine using a sheet feeding device according to a fifth embodiment of the present invention.

FIG. 17 is a perspective view showing the sheet transport roller of FIG.

FIG. 18 is a flowchart of a sheet feeding apparatus according to a fifth embodiment of the present invention.

FIG. 19 is a control block diagram of a sheet feeding device according to a sixth embodiment of the present invention.

FIG. 20 is a sectional view illustrating a one-way clutch according to a sixth embodiment of the paper feeding apparatus of the present invention.

FIG. 21 is a schematic sectional view of a copying machine using a sheet feeding device according to a sixth embodiment of the present invention.

FIG. 22 is a flowchart of a sheet feeding apparatus according to a sixth embodiment of the present invention.

FIG. 23 is a control block diagram of a sheet feeding device according to a seventh embodiment of the present invention.

FIG. 24 is a schematic sectional view of a copying machine using a sheet feeding device according to a seventh embodiment of the present invention.

FIG. 25 is a flowchart of a sheet feeding apparatus according to a seventh embodiment of the present invention.

FIG. 26 is a control block diagram of a sheet feeding device according to an eighth embodiment of the present invention.

FIG. 27 is a schematic sectional view of a copying machine using a sheet feeding device according to an eighth embodiment of the present invention.

FIG. 28 is a plan view showing the operation panel of FIG. 26;

FIG. 29 is a flowchart of a sheet feeding apparatus according to an eighth embodiment of the present invention.

FIG. 30 is a flowchart of Embodiment 9 of the sheet feeding apparatus of the present invention.

FIG. 31 is a flowchart of a sheet feeding apparatus according to a tenth embodiment of the present invention.

FIG. 32 is an explanatory diagram illustrating a sheet conveyance state in an example of a conventional sheet feeding device.

[Explanation of symbols]

 17 Manual Feed Tray 18 Manual Feed Detection Switch 19 Paper Transport Roller 20 Registration Roller 26 Paper Transport Roller Electromagnetic Clutch 28 Registration Roller Electromagnetic Clutch 29 CPU 34 Manual Feed Tray Detection Switch

Claims (7)

[Claims] In a paper feeding device having a paper conveying means for pinching and conveying a manually inserted paper, the paper feeding apparatus being disposed on a downstream side in a paper conveying direction facing a manual insertion opening, when a paper is inserted into the paper conveying means, A sheet feeding device, comprising: a control unit that drives and controls the sheet conveying unit at a first conveying speed lower than an assumed sheet inserting speed for a predetermined time. 2. An aligning means disposed downstream of the sheet transporting means in the sheet transporting direction and transporting a sheet in synchronization with a transfer timing of a transfer unit; and an aligning means disposed upstream of the aligning means in the sheet transporting direction. A paper detector, wherein the control means, when the downstream end of the paper is located between the aligning means and the paper detector, or when the paper detector detects the downstream end of the paper 2. The sheet feeding device according to claim 1, wherein when detected, the conveying speed of the sheet conveying means is controlled to a second conveying speed for alignment. 3. A manual feed tray supporting a sheet manually fed from the manual feed opening, which can be changed to a long state and a short state, and a tray state detector for detecting the long state and the short state of the manual tray, When the tray state detector detects the long state, the control means controls the driving of the sheet conveying means at the first conveying speed to a short time, and when the short state is detected, the first state of the sheet conveying means is controlled.
2. The sheet feeding device according to claim 1, wherein the driving at the transport speed is performed for a long time. 4. A manual feed tray supporting a paper manually fed from the manual feed opening, which can be changed into a long state and a short state, and a paper comparing means for detecting the length of the manually fed paper and comparing the length with the length of the manual tray. The control means, when the paper comparing means determines that the width of the paper is smaller than the length of the manual feed tray, shortens the driving of the paper transport means at the first transport speed, and reduces the width of the paper. 2. The sheet feeding device according to claim 1, wherein when it is determined that the speed is large, the driving of the sheet conveying means at the first conveying speed is performed for a long time. 5. The paper transport means comprises a manual paper transport section and a paper feed section disposed downstream of the manual paper transport section. The control means controls the transport speed of the manual paper transport section. Drive control at the first transport speed, drive control of the transport speed of the paper feed unit at the second transport speed, and release of the paper feed of the manual paper feed unit when paper is jammed in the paper feed unit, or 2. The sheet feeding device according to claim 1, further comprising a holding force control unit for reducing the holding force. 6. The holding force control means includes a one-way clutch, and when a sheet is jammed in the sheet feeding section, the manual feeding sheet conveying section is moved by the sheet feeding section by the second direction by the operation of the one-way clutch. 6. The sheet feeding device according to claim 5, wherein the sheet is driven by a sheet conveyed at a speed. 7. A manual feed mode by the paper transport means, an automatic paper feed mode for automatically feeding paper, and a manual selection key for selecting manual paper feed by the paper transport means; The control means cancels the manual feed mode when paper is not manually inserted after a certain time has elapsed after the operation of the manual feed selection key, and thereafter, operates the paper transport means for a certain time to detect the presence or absence of the paper. 2. The sheet feeding device according to claim 1, wherein a copying operation is performed when there is a sheet.