JP3796348B2 - Paper feeding device and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet feeding device provided in an image forming apparatus that forms an image on sheet materials fed one by one. Typical examples of the image forming apparatus include a printer, a copying machine, and a facsimile.
[0002]
[Prior art]
In the conventional image forming apparatus, the sheet feeding start timing of the sheet material (recording material) is fixed (fixed at the time of feeding start command) regardless of the sheet material type (material), the sheet material size, and the like. It is normal.
[0003]
[Problems to be solved by the invention]
However, if the sheet feeding start timing is constant regardless of the sheet material type, the following problem occurs.
[0004]
That is, plain paper, OHT, high gloss paper, and the like as a sheet material have different frictional force (μ1) between the sheet material and the frictional force (μ2) between the sheet feeding roller and the sheet material. For example, special sheet materials such as OHT and high gloss paper have higher μ1 and lower μ2 than plain paper, and slip easily occurs between the paper feed roller and the sheet material. For this reason, the time taken to reach a predetermined sheet feeding position varies depending on the sheet material type due to slippage between the sheet feeding roller and the sheet material.
[0005]
Therefore, for example, when jam detection timing is set for plain paper that does not easily slip between the paper feed roller and the sheet material, OHT or high gloss paper that easily slips between the paper feed roller and the sheet material. Then, there is a problem that a jam is detected due to a conveyance delay.
[0006]
On the other hand, when the jam detection timing is set in accordance with OHT or high gloss paper that easily slips between the paper feed roller and the sheet material, there is a problem that the paper feed time becomes long and the throughput decreases. .
[0007]
Therefore, the present invention has been made in view of the above-described circumstances, so that jamming due to slippage between the sheet feeding roller and the sheet material during sheet feeding can be eliminated, and stable sheet feeding can be performed. An object of the present invention is to provide a sheet feeding device.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a sheet feeding device that feeds one sheet material for one image formation.
[0009]
In order to achieve the above object, the present invention includes a sheet feeding roller that starts rotation by a sheet feeding start command and feeds the uppermost sheet material of a plurality of stacked sheets , It is characterized by having a sheet feed start timing changing means for changing the timing of the sheet feed start command of the sheet material according to the material relating to ease .
[0010]
In addition, the present invention for achieving the above object relates to a paper feeding device that feeds a plurality of sheet materials for one image formation.
[0011]
In order to achieve the above object, the present invention includes a sheet feeding roller that starts rotation by a sheet feeding start command and feeds the uppermost sheet material of a plurality of stacked sheets , It is characterized by having a sheet feed start timing changing means for changing the timing of a sheet feed start command for each sheet material in accordance with the material for ease of use and the sheet feed speed of each sheet material.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 shows the overall configuration of a color image forming apparatus to which the present invention is applied.
[0013]
The outline of the color image forming apparatus is as follows.
[0014]
That is, an image forming unit including an image carrier (photosensitive drum) 15 that rotates at a constant speed, a fixed black developing unit 21B, and three rotatable color developing units 20Y, 20M, and 20C, and development by the image forming unit. And an intermediate transfer body 9 that holds the multiple transferred color toner images and further transfers the color toner images to the sheet material 2 fed from the feeding unit. The sheet material 2 to which the color toner images have been transferred is transferred to the fixing unit 25. The color toner image is fixed on the sheet material 2 by being conveyed. Then, the sheet material 2 after fixing is conveyed by a pair of conveying rollers 34 and 35 and discharged to a discharge portion 37 on the upper surface of the apparatus by a discharge roller 36. The rotatable color developing devices 20Y, 20M, 20C and the fixed black developing device 21B are configured to be detachable from the image forming apparatus main body 40 individually.
[0015]
Next, an image carrier unit, a charging unit, an exposure unit, a developing unit, a cleaning unit, a cassette sheet feeding unit, a multi-sheet feeding unit, an intermediate transfer member, a transfer unit, and a fixing unit constituting the color image forming apparatus. The pre-exposure unit and the density detection sensor will be described in this order.
[Image carrier unit]
In the drum unit 13 constituting the image carrier unit, a photosensitive drum 15 as an image carrier and a cleaner container 14 that also serves as a holder of the photosensitive drum 15 are integrated. The drum unit 13 is detachably supported with respect to the image forming apparatus main body 40 so that the photosensitive drum 15 can be easily replaced.
[0016]
The photosensitive drum 15 is configured, for example, by coating an organic photoconductor layer on the outside of an aluminum cylinder having a diameter of about 60 mm, and is rotatably supported by the cleaner container 14. A cleaner blade 16 and primary charging means 17 are disposed on the periphery of the photosensitive drum 15.
[0017]
In addition, a drive motor (not shown) is disposed at one end in the direction perpendicular to the paper surface of the drawing, and the driving force of this drive motor is transmitted to the photosensitive drum 15 so that the photosensitive drum 15 performs an image forming operation. Accordingly, it rotates in the counterclockwise direction shown in the figure.
[Primary charging means]
The charger 17 constituting the primary charging means uses a contact charging method. A surface of the photosensitive drum 15 is applied by applying a voltage to the conductive roller by bringing the conductive roller into contact with the photosensitive drum 15. Charge uniformly.
[Exposure means]
The exposure of the surface of the photosensitive drum 15 is performed from the scanner unit 30 constituting the exposure unit. When an image signal is applied to a laser diode (not shown), this laser diode irradiates the polygon mirror 31 rotating at high speed with image light corresponding to the image signal.
[0018]
The image light reflected by the polygon mirror 31 selectively exposes the surface of the photosensitive drum 15 rotating at a constant speed via the imaging lens 32 and the reflection mirror 33. As a result, an electrostatic latent image is formed on the surface of the photosensitive drum 15.
[Development means]
The developing means is for visualizing the electrostatic latent image on the photosensitive drum 15, and includes three rotating color developing devices 20Y, 20M, and 20C capable of developing yellow, magenta, cyan, and black. And one black developing device 21B.
[0019]
The black developing device 21B is a fixed developing device, and the sleeve 21BS is disposed at a position facing the photosensitive drum 15 so as to have a minute interval (for example, about 300 μm) with respect to the photosensitive drum 15, and black toner is formed on the photosensitive drum 15. A visible image is formed.
[0020]
The black developing device 21B feeds black toner toward the sleeve 21BS by a toner feeding mechanism (not shown) in the container, and rotates the outer circumference of the sleeve 21BS rotated in the clockwise direction by the coating blade 21BB pressed against the outer circumference of the sleeve 21BS. The toner is applied in a thin layer, and the toner is charged (frictionally charged). Then, a toner is developed corresponding to the electrostatic latent image on the photosensitive drum 15 by applying a developing bias to the sleeve 21BS.
[0021]
The three rotating color developing devices 20Y, 20M, and 20C are detachably held by a developing rotary 23 that rotates about a shaft 22. When the image is formed, each rotating color developing device rotates around the shaft 22 while being held by the developing rotary 23, and the predetermined color developing device stops at a position facing the photosensitive drum 15. After that, the developing sleeve is positioned so as to face the photosensitive drum 15 with a minute interval (for example, about 300 μm), and then a visible image is formed corresponding to the electrostatic latent image on the photosensitive drum 15. To do.
[0022]
At the time of color image formation, the development rotary 23 rotates in the clockwise direction in the figure every time the intermediate transfer member 9 makes one rotation, and the yellow developing unit 20Y, the magenta developing unit 20M, the cyan developing unit 20C, and then the black developing unit 20B. Each color is developed.
[0023]
FIG. 1 shows a state in which the yellow developing device 20Y is positioned at a position facing the photosensitive drum 15.
[0024]
At this time, the yellow developing device 20Y sends yellow toner toward the coating roller 20YR by a toner feeding mechanism (not shown) in the container, and is pressed against the outer periphery of the coating roller 20YR and the sleeve 20YS rotating in the clockwise direction in the drawing. A thin layer of toner is applied to the outer periphery of the sleeve 20YS rotated in the clockwise direction in the figure by the blade 20YB, and an electric charge is applied to the toner (friction charging). Then, a toner is developed corresponding to the electrostatic latent image on the photosensitive drum 15 by applying a developing bias to the sleeve 20YS.
[0025]
The magenta developing device 20M and the cyan developing device 20C also perform toner development by the same mechanism as described above.
[0026]
When the rotary color developing devices 20Y, 20M, and 20C are rotationally moved to the developing position, voltages from the color developing high-voltage power sources and driving devices provided in the image forming apparatus main body are applied to connect the driving force.
[Cleaning means]
The cleaning means is for cleaning the toner remaining on the photosensitive drum 15 after the toner visualized on the photosensitive drum 15 by the developing means is transferred to the intermediate transfer body 9, and cleaning waste toner ( The toner to be discarded is stored in the cleaner container 14.
[0027]
The amount of waste toner stored in the cleaner container 14 does not fill the cleaner container 14 earlier than the life of the photosensitive drum 15. Accordingly, the cleaner container 14 is integrally replaced when the life of the photosensitive drum 15 is replaced.
[Cassette paper feeder]
The cassette sheet feeding unit feeds the sheet material 2 to the image forming unit. The cassette 1 stores a plurality of sheet materials 2, a sheet feeding roller 3, a feeding roller 4, and a retard roller 5 for preventing double feeding. The sheet feeding guide 6 and the registration roller pair 8 are provided.
[0028]
At the time of image formation, the paper feed roller 3 rotates according to the image forming operation, and the sheet material 2 in the cassette 1 is fed out. The fed sheet material is separated and fed one by one by the feed roller 4 and the retard roller 5, guided by the paper feed guide 6, and reaches the registration roller pair 8 through the transport roller 7.
[0029]
During the image forming operation, the registration roller pair 8 performs a non-rotating operation for allowing the sheet material 2 to stand still and a rotating operation for conveying the sheet material 2 toward the intermediate transfer body 9, and at the time of the next transfer process. Are aligned with the sheet material 2.
[Multi paper feeder]
The paper feed unit has a multi paper feed unit in addition to the cassette paper feed unit. The multi-sheet feeding unit 42 feeds the sheet material 2 to the image forming unit, and includes a tray 45 on which a plurality of sheet materials 2 are stacked, a sheet feeding roller 43, a separation pad 44 for preventing double feeding, and the like. Is done. Each member constituting the multi-sheet feeding unit is attached to an opening / closing cover 42a that covers the opening 40a formed on the front side of the image forming apparatus main body (housing) 40 so as to be opened and closed.
[0030]
The open / close cover 42 a is provided with an intake fan duct 49, and a pre-exposure unit 51 and a density detection sensor 50 are installed near the tip of the intake fan duct 49.
[0031]
The pre-exposure unit 51 and the density detection sensor 50 are prevented from being contaminated with toner or the like by the air flow (illustrated by broken lines) of the intake fan duct 49, and the function is not deteriorated.
[0032]
The intake fan duct 49 has an air filter 52 to prevent dust from entering from outside the machine.
[0033]
The open / close cover 42 a is attached to the image forming apparatus main body 40 with a support member 46 facing in the same direction as the rotation shaft 9 a of the intermediate transfer body 9 as a pivot point of rotation. When the lock mechanism (not shown) is released and the open / close cover 42a is opened to the open position indicated by the imaginary line, the pre-exposure unit 51 and the density detection sensor 50 are taken out of the apparatus and can be easily cleaned.
[0034]
At the time of image formation, the paper feed roller 43 rotates according to the image forming operation and feeds the sheet material 2 on the tray 45. The fed sheet material is separated one by one by the separation pad 44. The separated sheet material is guided by the guide plate 41 and reaches the registration roller pair 8 that performs the above-described operation.
[Intermediate transfer member]
The intermediate transfer member 9 receives the toner image on the photosensitive drum 15 visualized by each developing device during the color image forming operation four times (each image of four colors Y, M, C, and B). For this purpose, the photosensitive drum 15 rotates in the clockwise direction in synchronization with the outer peripheral speed of the photosensitive drum 15. Further, the intermediate transfer body 9 that has received the multiple transfer simultaneously multiplex-transfers each color toner image on the intermediate transfer body 9 onto the sheet material 2 by sandwiching and conveying the sheet material 2 with a transfer roller 10 to which a voltage is applied.
[0035]
The intermediate transfer member 9 shown here has a configuration in which, for example, the outer periphery of an aluminum cylinder 12 having a diameter of 180 mm is covered with an elastic layer 11 such as a medium resistance sponge or medium resistance rubber. The intermediate transfer member 9 is rotatably supported by intermediate transfer member holding members (not shown) on both sides, and driving from a motor (not shown) is transmitted to an integrally fixed gear (not shown). Rotate.
[Transfer section]
The transfer unit is composed of a swingable transfer roller 10 and the like. The transfer roller 10 is formed by winding a metal shaft with a medium resistance foamed elastic body, and can be moved in the vertical direction in the figure by a drive mechanism (not shown).
[0036]
While the four-color toner image is formed on the intermediate transfer member 9, that is, while the intermediate transfer member 9 rotates a plurality of times, the transfer roller 10 is positioned at a position indicated by a solid line so as not to disturb the image. 9 apart.
[0037]
When the transfer of the four color toner images onto the intermediate transfer member 9 is completed, the transfer roller 10 is moved to a position indicated by an imaginary line by a cam member (not shown) in accordance with the timing of transferring the color image to the sheet material 2. The material 2 is pressed against the intermediate transfer member 9 with a predetermined pressure.
[0038]
At this time, a bias is applied to the transfer roller 10 at the same time, and the toner image on the intermediate transfer member 9 is transferred to the sheet material 2. Since the intermediate transfer body 9 and the transfer roller 10 are respectively rotated, the sheet material 2 sandwiched between the two is conveyed at a predetermined speed in the left direction in the drawing at the same time as the transfer process is performed, and the next process To the fixing unit 25.
[Fixing part]
The fixing unit 25 fixes the toner image transferred onto the sheet material 2 by the developing device 21, and presses the fixing roller 26 for applying heat to the sheet material 2 and the sheet material 2 against the fixing roller 26. Pressure roller 27. Each of the rollers 26 and 27 is a hollow roller and has heaters 28 and 29 therein.
[0039]
The sheet material 2 is nipped and conveyed by the fixing roller 26 and the pressure roller 27, and the toner is fixed to the sheet material 2 by applying heat and pressure.
[Pre-exposure unit]
The pre-exposure unit 51 is mainly composed of LEDs. This LED is turned on / off in synchronization with the rotation of the intake fan duct 49 being turned on / off. By irradiating the photosensitive drum 15 with the light emitted from the LED, the surface potential of the photosensitive drum is stabilized and the image is stabilized.
[Density detection sensor]
The density detection sensor 50 includes an LED and a photodiode. The density detection sensor 50 reflects light emitted from the LED to the density detection pattern created on the intermediate transfer body 9 and receives the light from the photodiode to detect the density. From this detected density, an optimum developing bias is determined, and fluctuations in image density due to photosensitive drum deterioration, environmental change, toner deterioration, and the like are suppressed.
[Pre-registration sensor]
As shown in FIGS. 2 and 3, the pre-registration sensor 62 is disposed in a path immediately upstream of the registration roller pair 8 and detects the passing state of the sheet material 2 (determines whether the paper has reached the registration roller). . This is a simple structure in which the passage of paper is judged by whether or not the lever can emit the light of the photo interrupter.
[Sheet material type discrimination sensor (optical reflection type)]
As shown in FIGS. 2 and 3, the sheet material type determination sensor (optical reflection type) 53 is installed in a path immediately upstream of the registration roller pair 8 to determine the material of the sheet material 2. The sensor 53 includes an LED 53a and a photodiode 53b. Then, the light emitted from the LED 53a is reflected on the sheet material 2 passing through the path and received by the photodiode 53b. Then, the material of the sheet material is determined based on the output value of the photodiode 53b. This determination method will be described with reference to FIG.
[0040]
That is, if the output value of the photodiode 53b within the time T1 is between 1 [V] and 2 [V], it is determined as plain paper, and if it is between 3 [V] and 4 [V], high gloss paper is used. If it is 5 [V] or more, it is determined as OHT.
[0041]
Here, in order to keep the focal distance from the LED 53a constant and to stabilize the output value of the photodiode 53b, a paper pressing member 54 (preferably an elastic Mylar sheet or the like) is provided to suppress the behavior of the sheet material 2. Yes.
[0042]
Next, each image forming mode of the color image forming apparatus will be described.
[Single-sheet image forming mode]
The one-sheet tension image forming mode is an image forming mode in which an image for one sheet is formed on the outer peripheral surface of the intermediate transfer body 9 and transferred to one sheet material.
[Two-sheet image forming mode]
The two-sheet tension image forming mode is an image forming mode in which two sheets of images are simultaneously formed on the outer periphery of the intermediate transfer member 9 and sequentially transferred to the corresponding two sheets.
[Plain paper image formation mode]
The plain paper image forming mode is a mode for forming an image on plain paper. In this case, the speed at which the toner image formed on the outer periphery of the intermediate transfer body 9 is transferred to the sheet material and the fixing speed are normal speeds. In this mode, in the two-sheet image forming mode described above, the speed of the paper feed rollers 3 and 43 is set to the normal speed for both the first and second sheets.
[OHT image formation mode]
In the OHT image forming mode, in order to further improve the image quality on the OHT, the toner image formed on the outer periphery of the intermediate transfer body 9 is transferred to a sheet material, and the fixing speed is set to a normal speed. This is an image forming mode in which the speed is reduced to / 4. In the two-sheet image forming mode described earlier in this mode, the first sheet is set to a normal speed up to the registration roller pair 8 and is transferred to and fixed at a speed of 1/4 after the registration roller pair operation. . The second sheet is also decelerated to ¼ speed up to the registration roller pair 8. Therefore, the speed of the paper feed rollers 3 and 43 is the normal speed for the first sheet and the 1/4 speed for the second sheet.
[High gloss image forming mode]
The high gloss image forming mode refers to the speed at which the image formed on the outer periphery of the intermediate transfer body 9 is transferred to the sheet material and the fixing speed to the normal speed in order to further improve the quality of the image on the high gloss paper. This is an image forming mode in which the speed is reduced to 1/3 of the speed. In the two-sheet image forming mode described earlier in this mode, the first sheet is set at a normal speed up to the registration roller pair 8 and is transferred to and fixed at a speed of 1/3 after the operation of the registration roller pair 8. I do. The second sheet is also decelerated to 1/3 the speed of the registration roller pair 8. Accordingly, the speed of the paper feed rollers 3 and 43 is the normal speed for the first sheet and the 1/3 speed for the second sheet.
[0043]
Next, the present invention portion will be described.
[0044]
The plain paper image forming mode plain paper, the OHT image forming mode OHT, and the high gloss image forming mode high gloss paper have the frictional force (μ1) between the sheet material 2 and the sheet material 2 and the feed roller 3. , 43 and the sheet material 2 are different in friction force (μ2), and OHT and high gloss paper have higher μ1 and lower μ2 than plain paper. For this reason, slip is likely to occur between the sheet feeding rollers 3 and 43 and the sheet material 2.
[0045]
Therefore, in OHT and high gloss paper, a conveyance delay due to slip occurs, and it takes a longer time to reach the pre-registration sensor 62 from the paper feed start command, and the detection timing of the pre-registration sensor 62 is in time. A jam is detected.
[0046]
FIG. 5 shows the time (T2, T3, T4) from when the plain paper, the high gloss paper, and the OHT reach the pre-registration sensor 62 from the paper feed start command.
[0047]
In order to eliminate the above problem, here, the timing for starting the feeding of the high gloss paper and the OHT is made earlier than that of the plain paper so that the jam detection due to the slip is not performed. FIG. 6 shows the timing of starting feeding of plain paper, high gloss paper, and OHT. In the case of high gloss paper and OHT, the paper feed start timing is set a predetermined time (T5, T6) earlier than the plain paper feed start timing.
[0048]
Here, the timing of starting the feeding of high gloss paper and OHT in the single-sheet tension mode has been described. However, the feeding speed of the high gloss paper and OHT in the two-sheet tension mode is high for the first and second sheets. Therefore, the timing for starting the feeding of the first and second sheets is set in consideration of the difference in speed.
[0049]
In the case of this color image forming apparatus, the operator manually inputs each image forming mode to the CPU (paper feed start timing changing means) 61 from the operation unit (sheet material input means) 60 of the image forming apparatus main body 40. Yes. Therefore, the CPU 61 can know the material of the sheet material from the input mode information, and sets the sheet feeding start timing based on this material information.
[0050]
<Second Embodiment>
The CPU 61 of this color image forming apparatus determines the image forming mode and the material of the sheet material based on the information sent from the optical reflection type sheet material type discrimination sensor (sheet material material detection means) 53, and starts the sheet feeding. Timing can be set.
[0051]
<Third Embodiment>
FIG. 7 shows another configuration of the sheet material type discrimination sensor.
[0052]
The sheet material type discrimination sensor 55 is an optical transmission type sensor, and includes an LED 55a, a photodiode 55b, and a prism 55c.
[0053]
In the sheet material type discrimination sensor 55, plain paper and OHT (sheet material through which light is transmitted) are discriminated based on whether or not light reflected from the prism 55c by the LED 55a and reflected by the photodiode 55b is received.
[0054]
With the above configuration, it is possible to automatically determine the sheet material type to be passed through while limiting the sheet material type.
[0055]
【The invention's effect】
As described above, according to the present invention, the sheet material feeding start timing is changed according to the sheet material material and the sheet feeding speed so that the timing to reach a predetermined sheet feeding position is constant. Since the adjustment is performed, jamming due to the paper feed slip is not detected even if the special paper such as OHT or high gloss paper is likely to cause paper feed slip, and stable paper feeding can be performed.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an overall configuration of a color image forming apparatus to which the present invention is applied.
FIG. 2 is a longitudinal side view showing a configuration of a pre-registration (sheet material type discrimination sensor) sensor provided in the color image forming apparatus.
FIG. 3 is a longitudinal front view (a cross-sectional view taken along line AA in FIG. 2) showing the configuration of the sensor before registration.
FIG. 4 is a diagram illustrating an output value of a sheet material type output by a pre-registration sensor.
FIG. 5 is a diagram illustrating a sheet material type time required for a sheet material to reach a pre-registration sensor from a sheet feeding start command.
FIG. 6 is a diagram illustrating the timing of starting feeding of a sheet type.
FIG. 7 is a cross-sectional view showing another configuration example of the sheet material type discrimination sensor.
[Explanation of symbols]
2 Sheet material 9 Intermediate transfer member 60 Operation section (sheet material material input means)
61 CPU (paper feed start timing changing means)
53 Optical reflective sheet material type discrimination sensor (sheet material quality detection means)
55 Optical transmission type sheet type discrimination sensor (sheet material quality detection means)
62 Sensor before registration

Claims (8)

In a paper feeding device that feeds one sheet material for one image formation,
A paper feed roller that starts rotation by a paper feed start command and feeds the uppermost sheet material of a plurality of stacked sheets,
A sheet feeding device comprising sheet feeding start timing changing means for changing a timing of a sheet sheet feeding start command in accordance with a material related to ease of slipping of the sheet material. In a paper feeding device that feeds a plurality of sheet materials for one image formation,
A paper feed roller that starts rotation by a paper feed start command and feeds the uppermost sheet material of a plurality of stacked sheets,
Feeding start timing changing means for changing the timing of a sheet feeding start command for each sheet material in accordance with the material related to the ease of slipping of the sheet material and the feeding speed of each sheet material apparatus.   The sheet feeding device according to claim 1, wherein the sheet feeding apparatus adjusts the timing at which the sheet material reaches a predetermined sheet feeding position to be constant by changing a sheet feeding start timing. 2. A jam caused by a slip between a sheet feeding roller and a sheet material is prevented from being detected at a predetermined sheet feeding position by changing a sheet feeding start timing. Or the sheet feeding device described in 2. In the case of a sheet material in which the friction force between the sheet material and the sheet material is higher than that of plain paper and the friction force between the sheet material and the paper feed roller is lower than that of plain paper, 5. The sheet feeding device according to claim 1, wherein the sheet feeding start timing is set a predetermined time earlier than the sheet starting timing. Sheet material material input means for manually inputting the material of the sheet material , and the sheet feed start timing changing means changes the sheet feed start timing based on the material information input by the sheet material material input means. The sheet feeding device according to claim 1, wherein: Sheet material material detection means for detecting the material of the sheet material is provided, and the paper feed start timing changing means changes the paper feed start timing based on the material information detected by the sheet material material detection means. The sheet feeding device according to any one of claims 1 to 5 . A paper feeding device according to any one of claims 1 to 7,
An image forming apparatus comprising: an image forming unit that forms an image on a sheet material fed from the sheet feeding device.

Images