JP3768758B2 - Sheet conveying apparatus and image forming apparatus provided with the apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet conveying device that conveys a sheet, and an image forming apparatus such as a copying machine, a facsimile, a laser printer, and a composite device including the sheet conveying device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a sheet conveying device that conveys a sheet is provided in an image forming apparatus.
[0003]
The sheet conveying apparatus includes a plurality of roller pairs that are arranged along a sheet conveying path that guides the sheet, and that convey a sheet, and a plurality of drive motors that rotate the roller pair and other rotating bodies. The sheet fed from the sheet cassette is conveyed to an image forming unit that forms an image on one side of the sheet, and then discharged out of the main body of the image forming apparatus, or an image is formed on one side. The conveyed sheet is conveyed again to the image forming unit to form an image on the other side, and then discharged out of the image forming apparatus main body.
[0004]
Incidentally, the sheet conveying apparatus performs multiple front rotations when the front opening / closing cover of the image forming apparatus main body is opened and closed. This pre-multi-rotation is based on the assumption that there is a sheet that has been forgotten in the image forming apparatus after the jam processing, and by driving each roller pair for a certain time, the sheet disposed in the sheet conveyance path It is carried out in order to convey from the position not detected by the detection sensor to the detectable region of the sheet detection sensor and to inform the user by operating the sheet detection sensor.
[0005]
This pre-multi-rotation is generally performed to confirm that there is no remaining sheet in the image forming apparatus even when the image forming apparatus in a normal state is turned on.
[0006]
[Problems to be solved by the invention]
However, in the conventional sheet conveying device, since each conveying roller is activated simultaneously at the time of multiple front rotations, the impact sound and the starting sound are generated at the same time when the gears are engaged with each other. Was uncomfortable. In view of this, since the countermeasures against the noise have been taken by reinforcing the mounting portion of the drive motor or by using a vibration-proofing material or a soundproofing material for each component in the image forming apparatus or the image forming apparatus main body, the size of the image forming apparatus main body is increased. Sometimes increased.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveying apparatus with reduced start-up sound and a small image forming apparatus provided with the sheet conveying apparatus without causing a significant increase in cost.
[0021]
[Means for Solving the Problems]
  The sheet conveying apparatus of the present invention conveys a sheet along a sheet conveying path, each of which is driven by independent driving means, and a plurality of sheet conveying means,
  A plurality of the driving means when the power is turned on;With
  The control means sequentially starts from a driving means for driving the sheet conveying means on the upstream side of the sheet conveying path when the power is turned on.It is characterized by that.
[0022]
The sheet conveying apparatus conveys the sheet along the sheet conveying conveyance path by driving of the driving unit. Each driving means is activated by the control means while shifting the activation time.
[0023]
Therefore, when the sheet conveying apparatus according to the present invention is activated, the activation noise by the driving means is low.
[0024]
Each of the sheet conveying means of the sheet conveying apparatus of the present invention has at least one rotating body pair that conveys the sheet by rotating in contact with the sheet.
[0026]
In the sheet conveying apparatus, since the driving unit is activated from the downstream side in the sheet conveying direction by the control unit in a normal state or after the sheet jamming process, the upstream end and the downstream end of the sheet are separated from each other. Even if the sheet conveying means on the upstream side and the sheet conveying means on the downstream side may simultaneously convey the sheet, the sheet conveying means on the downstream side does not pull and tear the sheet. Further, the upstream sheet conveying means is not pulled out by being pulled by the downstream sheet conveying means via the sheet.
[0027]
  The image forming apparatus of the present invention has2An image that is disposed in the middle of the sheet conveying path of one of the sheet conveying apparatuses and the sheet conveying apparatus, and forms an image on the sheet conveyed through the sheet conveying path. Forming means.
[0028]
  The sheet conveying apparatus of the present invention has at least one pair of rotating bodies that convey the sheet along the sheet conveying path by contacting the sheet, and each of the sheet conveying apparatuses is driven by an independent driving unit. Means, a door that is opened and closed when removing a jammed sheet in the sheet conveyance path, a door opening and closing detection means that detects opening and closing of the door, and the door opening and closing detection means that the door is closed Control means for controlling to start by shifting the starting time of the drive means sometimes,When the door opening / closing detection unit detects that the door is closed, the control unit starts up sequentially from a driving unit that drives the sheet conveying unit on the upstream side of the sheet conveying path.
  The sheet conveying apparatus of the present invention includes a sheet detecting unit that detects a sheet along the sheet conveying path, and the control unit activates the driving unit, and then the sheet detecting unit detects the sheet. In this case, the driving means is stopped.
  In the sheet conveying apparatus of the present invention, the driving means is a motor.
[0029]
The control means of the sheet conveying apparatus of the present invention is sequentially activated from a driving means for driving the sheet conveying means on the upstream side of the sheet conveying path.
[0030]
  The image forming apparatus of the present invention has3One of the two sheet conveying apparatuses, and an image forming unit that is disposed in the middle of the sheet conveying path of the sheet conveying apparatus and forms an image on the sheet conveyed through the sheet conveying path; It is equipped with.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a sheet conveying apparatus 100 according to an embodiment of the present invention and a copying machine 200 that is an image forming apparatus including the sheet conveying apparatus 100 in a main body 201 will be described with reference to the drawings.
[0032]
The sheet conveying apparatus according to the embodiment of the present invention can be provided not only in a copying machine but also in a main body of a facsimile, a printer, or a complex machine of these, and only in the main body 201 of the copying machine 200. It is not limited to being equipped.
[0033]
The sheets include plain paper, thin resin sheets that are substitutes for plain paper, postcards, cardboard, sealed letters, plastic thin plates, and the like.
[0034]
The copying machine 200 can copy images on both front and back sides of one sheet.
[0035]
The image forming apparatus includes a plurality of sheet supply cassettes 15 and 16. The sheets S of different sizes respectively loaded and stored in the sheet supply cassettes 15 and 16 are selectively fed to the image forming means 40.
[0036]
  The sheets S stacked and stored in the sheet supply cassettes 15 and 16 are a pair of rotating bodies that rotate in the direction of the arrow, and are fed from the uppermost sheet by sheet supply rollers 17 and 18 that are sheet conveying means.A sheet supply path 81 which is a sheet conveyance pathAre fed out sequentially. The sheet supply path 81 guides the sheet from the sheet supply cassettes 15 and 16 to the image forming unit 40 described later.
[0037]
The sheet S fed out by the sheet supply rollers 17 and 18 is a pair of rotating bodies that rotate in the direction of the arrow, and is separated one by one by a pair of sheet separating rollers 20 and 21 that are sheet conveying means, and the second resist that is stopped rotating. The roller 22 is fed to a registration roller pair 23 which is a pair of rotating bodies and a pair of sheet separating rollers.
[0038]
When the leading edge of the sheet S fed by the sheet separation roller pair 20 and 21 hits the nip of the registration roller pair 22, a predetermined loop is formed to correct the skew state.
[0039]
The sheet S whose skew state has been corrected is subjected to image forming means by the second registration roller pair 22 that starts rotating in the arrow direction at the timing of aligning the position with the toner image on the photosensitive drum 4 rotating in the arrow direction. It is sent between 40 photosensitive drums 4 and the transfer charger 12. Here, the toner image on the photosensitive drum 4 is transferred to the sheet by the transfer charger 12.
[0040]
In the copying machine 200, an image of a document set on the platen glass 5 is read by the CCD 10 by an optical system including an illumination lamp 6, reflecting mirrors 7 and 8, a zoom lens 9, and the like. The read information is irradiated as laser light on the photosensitive drum 4 rotating in the direction of the arrow by a laser scanner through desired image processing. As a result, an electrostatic latent image is formed on the photosensitive drum 4. This electrostatic latent image is visualized by the black toner supplied from the developing device 14 and becomes a toner image.
[0041]
The sheet S to which the toner image has been transferred in the image forming unit 40 is sent by the conveyance belt 13 to the fixing roller 24 which is a pair of rotating members of the fixing device and is a sheet conveyance unit. Then, the toner image is fixed on the sheet by the identification roller 24.
[0042]
In the case of the single-sided copying and the front sheet discharge mode, the sheet S that has been subjected to the fixing process of the toner image is a pair of rotating bodies and an outer sheet that is the sheet conveying means by the in-sheet discharge roller 25 that is the sheet conveying means. The sheet is discharged to a pair of discharge rollers 27 and is discharged onto a sheet discharge tray outside the main body of the image forming apparatus with the image surface facing upward by the pair of discharge rollers 27 outside the sheet. At this time, the flapper 26 installed at the branch portion is switched to the position indicated by reference numeral 26a.
[0043]
In the backside sheet discharge mode, the sheet sent from the in-sheet discharge roller 25 is conveyed to the conveyance path 66 side, which is the sheet conveyance path, by switching the flapper 26 to the position indicated by reference numeral 26b. The sheet discharge reversing roller 59, which is a sheet conveying means, is fed in the direction A, and when the trailing edge of the sheet reaches the position of La, the sheet discharge reversing roller 59 is reversed to the outside sheet discharge roller pair 27. The sheet is discharged onto the sheet discharge tray with the image surface facing downward by the sheet outer discharge roller pair 27.
[0044]
In the double-sided copying mode, the sheet sent from the in-sheet discharge roller 25 is conveyed to the conveyance path 66 side when the flapper 26 is switched to the side indicated by reference numeral 26b, and the sheet discharge reversal roller, as in the backside sheet discharge. 59, the double-sided reversing roller 60 is reversed when the trailing edge of the sheet that has been fed in the A direction by the double-sided reversing roller 60 that is a pair of rotating bodies and that is a sheet conveying means and has entered the sheet reversing path 61 reaches the position of Lc. Then, the sheet is sent to a re-sheet supply path 50 that is a sheet conveyance path with the image surface facing inward.
[0045]
Among the above-described components, the sheet supply path 81, the conveyance belt 13, the conveyance path 66, the sheet reversal path 61 that is the sheet conveyance path, the re-sheet supply path 50, and the like form a sheet conveyance path 82.
[0046]
Among the above components, the rotating parts (rotating body pair) are rotated by motors (rotation drive means, drive means) M1, M2, M3, M4, M5, M6, and M7, as shown in FIG. It has become.
[0047]
That is, the photosensitive drum 4, the registration roller pair 23, and the conveyance belt 13 that constitute the first conveyance unit are driven by the main motor M1, and the sheet supply rollers 17 and 18, the sheet separation roller pair 20, the second conveyance unit. 21 and the second registration roller 22 by a sheet supply motor M2 using a stepping motor, a fixing roller 24 constituting the third conveying means, and an in-sheet discharge roller 25 by a fixing motor M3 using a DC motor. The sheet discharge reversing roller 59 constituting the conveying means is driven by a sheet discharge reversing motor M4 using a stepping motor, and the double-side reversing roller 60 constituting the fifth conveying means is driven by a double-side reversing motor M5 using a stepping motor. Rotating body pairs arranged in a re-sheet supply path 50 constituting a conveying means Three pairs of double-sided rollers 52, 53, and 54, which are sheet conveying means, are driven by a double-sided motor M6 using a stepping motor, and a pair of out-of-sheet discharge rollers 27 constituting the seventh conveying means is discharged outside the sheet using a stepping motor. Each motor M7 rotates.
[0048]
As shown in FIGS. 1, 2, and 4, the sheet detection sensor (sheet detection means) includes a pre-registration sensor 30, a second registration sensor 19, an in-sheet discharge sensor 62, a double-side entrance sensor 71, and a double-sided re-sheet supply sensor. 72, an out-of-sheet discharge sensor 73 is provided. Processing control at the time of sheet jamming (jamming) and pre-multi-rotation control after sheet jamming processing (jamming processing) are all performed by a CPU (control means) 70.
[0049]
When the time from when each sensor detects the leading edge of the sheet until the trailing edge is detected is longer than a predetermined time, the CPU 70 determines that a sheet jam has occurred, A clog is displayed.
[0050]
The sheet jamming process when a sheet jam occurs will be described with reference to the flowchart of FIG. 3 and the block diagram of FIG.
[0051]
Each sheet detection sensor checks a sheet jam (step (hereinafter abbreviated as “S” and abbreviated as “1”) 1). When a sheet jam occurs during printing, these sheet detection sensors detect the presence of the jammed sheet and report it to the user. In the case of a copying machine, the location of the sheet jam is clearly indicated on the screen of the operation unit, and the sheet jam status (jamming status) is displayed (S2).
[0052]
When a front door (not shown) is opened by the user as a sheet jamming processing procedure, the front door switch 74 (see FIG. 1) serving as a door open / close detection means is turned off (S3). When the user cannot open the front door, the sheet jammed portion remains clearly displayed on the screen of the operation unit (S2).
[0053]
The user opens the front door, confirms whether there is a sheet in the apparatus, removes the jammed sheet (S4), and closes the front door (S5). The front door switch is turned on.
[0054]
At this time, if there are a plurality of sheets in the apparatus, the user may forget to leave the sheets in the apparatus. Therefore, after the front door is closed, each sheet detection sensor detects the sheet jam again (S6), and if the jammed sheet remains, the process returns to S2.
[0055]
  In S6, a sheet that remains in the apparatus and is jammed may be outside the detection range of the sheet detection sensor. For this reason, before the copying machine 100 is fully activated, the sheet supply motor M2, the main motor M1, and the fixing motor M3 are first activated to perform the above-described multi-rotation operation (S7). After about 300 ms, the downstream sheet discharge reverse motor M4, the out-sheet discharge motor M7, and the double-side reverse motor M5 are activated.furtherAfter about 300 ms, the double-sided motor M6 is activated.
[0056]
In this way, each motor is activated from the upstream side in the sheet conveying direction. At this time, if the sheet is started from the downstream side, a case where the sheet is pulled out from the roller pair occurs depending on the remaining sheet. In such a case, if the motor torque is not sufficient, the motor may step out, and the sheet may be torn and processing of the jammed sheet may be difficult. As described above, the motor is started from the upstream side in order to prevent the motor from stepping out or tearing the sheet. At this time, the activation interval of about 300 ms may have a degree of freedom. In other words, since the motor is started from the upstream side, it may hit the downstream roller and form a loop on the sheet, but the sheet detection assumes that the sheet remains immediately before the sheet detection sensor. In consideration of the distance between the sensor and the nip of the roller pair, the gap between the sheet guides, and the like, the activation interval of each motor may be set so that the sheet does not buckle.
[0057]
The sheet discharge reversal motor M4 and the double-side reversal motor M5 are capable of forward and reverse rotation because the rollers 59 and 60 perform forward feeding and backward feeding of the sheet, but in order to increase the visibility of jammed sheets, Each shall be rotated in the direction to go out of the machine (reverse direction).
[0058]
After the previous multi-rotation operation, the detection operation (S10) of whether or not there is a sheet jammed by the sheet detection sensor is performed again for a predetermined time (S11). If a jammed sheet is detected during this time, the rotation of the motors M1 to M10 is stopped at that time (S11), and the sheet jamming processing operation is repeated. After a predetermined time has elapsed since the previous multi-rotation (S12), if the jammed sheet is not detected by the sheet detection sensor, the motors M1 to M10 continue to rotate and shift to a state of conveying the sheet (S13). .
[0059]
The preceding multi-rotation operation has been described above in connection with the sheet jamming process. However, the pre-multi-rotation operation is also performed when the copying machine is activated. Therefore, in this sheet conveying apparatus, by starting each motor from the upstream side, motor step-out after sheet clogging processing, noise reduction, noise reduction at the start-up of a normal copying machine, etc. It becomes possible and the discomfort given to the user can be solved.
[0060]
In the above description, in S7, S8, and S9, the motors are grouped and started sequentially from the upstream group, and the motors in each group are started at the same time. You may start in order from the motor to do.
[0061]
As another embodiment of the sheet conveying apparatus, the sheet supply motor M2, the sheet discharge reversing motor M4, the double-side reversing motor M5, the double-sided motor M6, and the out-of-sheet discharging motor M7 are slowed up when the stepping motor is used. There is also a sheet conveying device which is controlled (see FIG. 6). This makes it possible to gradually accelerate the rising rotation of the motor and the roller pair, so that noise at the time of activation can be further reduced and sheet tearing can be prevented.
[0062]
In the above description, the rollers 17, 18, 20, 21, 22, 23, 24, 25, 59, 60, 52, 53, 54, the photosensitive drum 4, and the conveyor belt 13 are rotated by M1 to M7. However, the number of motors is further reduced (at least one), and a roller, a photosensitive drum, and a conveyor belt are connected to the reduced motor via a clutch, and the operation of the clutch is controlled by a control circuit. Then, the pre-multi-rotation operation may be performed. Therefore, the rotation driving means in the present invention includes a clutch in addition to the motor.
[0063]
In the above embodiment, the CPU 70 controls each of the motors M1 to M7 in the main body 301 of the copying machine 300 that is an image forming apparatus. As shown in FIG. In the copying machine 300 including the apparatus 303 and the sheet supply pedistor 304 in the main body 301, motors M8, M9, and M10 described later in the apparatuses 302, 303, and 304 can be controlled. In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0064]
The sheet supply deck 302 includes a sheet conveying device 310 that supplies the sheets S from the sheet cassette 311 to the sheet supply path 81. The sheet conveying device 310 is a pair of rotating bodies that send out a sheet from the sheet cassette 311 and is a sheet feeding roller 312 that is a sheet conveying unit, and a sheet feeding path that is a sheet conveying furnace that guides the sheet from the sheet cassette 311 to the sheet feeding path 81. 313, a pair of rotating members provided in the sheet supply path 313 for separating and conveying sheets into one sheet and a sheet separating roller pair 314 as sheet conveying means, and a pair of rotating bodies for conveying sheets and sheet conveying means. And a roller pair 315. The sheet supply roller 312, the sheet separation roller pair 314, and the sheet transport roller pair 315 are rotated by a large capacity sheet supply motor M8.
[0065]
The sheet post-processing device 303 discharges the sheet formed and discharged from the main body 301 to the tray 321 as it is by the sheet discharge roller pair 328 or discharges the sheet by aligning the sheet width by the sheet width aligning device 322. In addition, sheets with the same width are bound and discharged by the stapler 323, or the bound sheet bundle is folded in two by a not-shown two-folding device and discharged. When aligning the sheets, the sheets are discharged after being retained in the buffer path 325 around the rotating buffer roller 324. The buffer path 325 is provided with a roller 326 that conveys the sheet. The sheet discharge roller pair 328, the buffer roller 325, the roller 326, and the like constitute a sheet conveying device 327 and are rotated by a sheet post-processing motor M9. A buffer path 325, a sheet discharge path 321 for directly discharging a sheet from the main body 301 to the tray 321, and the like constitute a sheet conveyance path 320.
[0066]
The sheet supply pedistor 304 has additional sheet supply cassettes 15 and 16, and the sheet supply rollers 17 and 18 and the sheet separation roller pair 20 and 21 related to the sheet supply cassettes 15 and 16 include an additional sheet supply motor. It rotates by M10. The sheet conveying apparatus 330 in the copying machine main body 301 has a configuration in which the sheet conveying path 81 of the sheet supply pedistor 30 is added to the sheet conveying apparatus 100 of FIG.
[0067]
FIG. 8 shows a flowchart of the sheet clogging process in the copying machine 300 of FIG. Compared with FIG. 3, in this flowchart, in step (S) 7A, the motors M1, M2, and M3 and the motor M8 or M10, which is the rotation driving means and the driving means, are simultaneously activated, and step (S) 8A. However, in addition to the motors M4 and M7, the motor M9, which is a rotational drive means and a drive means, is also started, and the other sections are the same. The same reference numerals are given, and the description of the sections is omitted.
[0068]
In section (S) 7A, the sheet supply deck 302, and the sheet supply dister 304 are not operated at the same time so that the sheets do not overlap each other. Therefore, one of the motor M8 and the motor M10 is not operated. It is designed to operate selectively. In addition, when it is clear that the sheet is jammed only by the sheet supply deck 302 and the sheet supply pedistor 304 and no sheet remains in the main body 301, it is not necessary to start the motors M1 to M7. Further, in the case of the copying machine 300 of FIG. 7, as shown in the section (S) 6-1 and the section (S) 8-1 of the flowchart of FIG. 9, the motor M8 or M10 is separated from the motors M1 to M3. The motor M10 may be activated separately from M6. In the flowchart shown in FIG. 9 as well, the same sections as those in the flowchart of FIG.
【The invention's effect】
In the sheet conveying apparatus according to the present invention, since the activation times of the plurality of rotation driving means for rotating the pair of rotating bodies are shifted, the activation sound of the rotation driving means is reduced, and the discomfort given to the user can be eliminated. Further, since it is not necessary to take measures against sound by increasing the strength of the mounting portion of the rotation driving means or using a vibration isolating material or a sound insulating material, it is possible to prevent an increase in cost.
[0069]
As in the sheet conveying apparatus of the present invention, when the rotation driving unit is activated from the downstream side in the sheet conveying direction in a normal state or after the sheet jamming process, the upstream end and the downstream end of the sheet are upstream. Even when the pair of rotating bodies on the side and the pair of rotating bodies on the downstream side are sandwiched, it is possible to prevent the pair of rotating bodies on the downstream side from pulling and tearing the sheet. Further, it is possible to prevent the upstream rotational driving means from being stepped out by being pulled by the downstream rotational driving means via the seat.
[0071]
As in the sheet conveying apparatus of the present invention, a plurality of sheet detecting means for detecting a sheet are arranged along the sheet conveying path, and when the control means detects a jammed sheet by the sheet detecting means, it is rotationally driven. If the means is stopped, when the sheet is jammed, the rotation driving means can be stopped to prevent the sheet conveying apparatus from being damaged.
[0072]
Since the image forming apparatus of the present invention includes the above-described sheet conveying device with a low start-up sound, it is not necessary to take measures against sound by increasing the strength of each component or using a vibration-proof material or a sound-proof material. Therefore, an increase in cost can be prevented. Moreover, it can be made small.
[Brief description of the drawings]
FIG. 1 is a schematic front sectional view of a copying machine which is an image forming apparatus provided with a sheet conveying device according to an embodiment of the present invention.
FIG. 2 is a schematic front view of the sheet conveying apparatus in FIG.
FIG. 3 is a flowchart of sheet clogging processing in the copier in FIG.
4 is a block diagram of the control relationship of the sheet conveying apparatus in FIG. 2. FIG.
FIG. 5 is a time chart showing a starting state of each motor.
FIG. 6 is a time chart showing a roller peripheral speed during slow-up control.
FIG. 7 is a schematic front sectional view of a copying machine which is an image forming apparatus according to another embodiment.
FIG. 8 is a flowchart corresponding to FIG. 7;
FIG. 9 is another flowchart corresponding to FIG. 7;
[Explanation of symbols]
S sheet
82, 320, 330 Sheet conveyance path
50 Re-sheet supply path (sheet transport path)
61 Sheet reversing path (sheet transport path)
66 Conveying path (Sheet conveying path)
81,313 Sheet supply path (sheet conveyance path)
17, 18, 312 Sheet supply roller (rotating member pair, sheet conveying means)
20, 21, 314 Sheet separation roller pair (rotating body pair, sheet conveying means)
23 Registration roller pair (Rotating body pair, sheet conveying means)
24 fixing roller (rotating member pair, sheet conveying means)
25 In-sheet discharge roller (rotating member pair, sheet conveying means)
27 Out-sheet discharge roller pair (Rotating body pair, sheet conveying means)
52, 53, 54 Double-sided roller (Rotating body pair, sheet conveying means)
59 Sheet discharge reversing roller (Rotating body pair, sheet conveying means)
60 Double-sided reversing roller (Rotating body pair, sheet conveying means)
315 Sheet conveying roller pair (rotating body pair, sheet conveying means)
324 Buffer roller (Sheet conveying means)
326 roller (sheet conveying means)
328 Pair of sheet discharge rollers (rotating member pair, sheet conveying means)
M1 main motor (rotation drive means, drive means)
M2 sheet supply motor (rotation drive means, drive means)
M3 fixing motor (rotation drive means, drive means)
M4 sheet discharge reversing motor (rotation drive means, drive means)
M5 double-sided reversing motor (rotation drive means, drive means)
M6 double-sided motor (rotation drive means, drive means)
M7 Outside sheet discharge motor (rotation drive means, drive means)
M8 large capacity sheet supply motor (rotation drive means, drive means)
M9 sheet post-processing motor (rotation drive means, drive means)
M10 Extension sheet supply motor (rotation drive means, drive means)
19 Second registration sensor (sheet detection means)
30 Sensor before registration (sheet detection means)
62 In-sheet discharge sensor (sheet detection means)
71 Double side entrance sensor (sheet detection means)
72 Double-sided re-sheet supply sensor (sheet detection means)
73 Out-sheet discharge sensor (sheet detection means)
74 Front door switch (door open / close detection means)
40 Image forming means
70 control circuit (control means)
100, 310, 327, 330 Sheet conveying device
200,300 copier (image forming device)
201, 301 Copier body
302 Sheet supply deck
303 Sheet post-processing device
304 Sheet supply pedistor

Claims (6)

A plurality of sheet conveying means for conveying the sheet along the sheet conveying path, each driven by an independent driving means;
A plurality of the driving means when the power is turned on, and a control means for starting and controlling at different times ,
The sheet conveying apparatus, wherein the control unit sequentially starts from a driving unit that drives the sheet conveying unit on the upstream side of the sheet conveying path when the power is turned on .   The sheet conveying apparatus according to claim 1, wherein each of the sheet conveying units includes at least one rotating body pair that conveys the sheet by rotating in contact with the sheet. A plurality of sheet conveying means having at least one pair of rotating bodies that convey the sheet along the sheet conveying path by contacting the sheet, each driven by an independent driving means;
A door that is opened and closed when removing a jammed sheet in the sheet conveying path;
Door opening and closing detection means for detecting opening and closing of the door;
Control means for controlling to start by shifting the start time of the drive means when the door open / close detection means detects that the door is closed ,
When the door opening / closing detection unit detects that the door is closed, the control unit sequentially activates the drive unit that drives the sheet conveyance unit on the upstream side of the sheet conveyance path. Conveying device. A sheet detection means for detecting a sheet is disposed along the sheet conveyance path,
4. The sheet according to claim 1, wherein the control unit stops the driving unit when the sheet detecting unit detects a sheet after the driving unit is activated. 5. Conveying device. The sheet conveying apparatus according to claim 1, wherein the driving unit is a motor. A sheet conveying apparatus according to any one of claims 1 to 5 ,
An image forming unit disposed in the middle of the sheet conveying path of the sheet conveying apparatus to form an image on the sheet conveyed through the sheet conveying path;
An image forming apparatus comprising:

Images