JP4135084B2 - Sheet supply apparatus and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet feeding apparatus that sequentially feeds stacked sheets one by one, and more particularly to a sheet feeding apparatus that can effectively prevent so-called double feeding in which two or more sheets are fed in a superimposed manner. .
[0002]
[Prior art]
In an image forming apparatus such as a printer or a copying machine, a recording sheet cut into a predetermined size is used as a recording medium on which an image is formed. As the recording paper, high-quality paper for copying machines is generally used, and the surface smoothness of these recording papers is relatively low. For this reason, the adhesion between the recording sheets is small, and it is relatively easy to prevent double feeding when the recording sheets are fed one by one from the sheet tray. However, in recent years, with the diversification of recording media, recording sheets having high surface smoothness are often used. Such a recording sheet has high surface adhesion, and double feeding is likely to occur. In particular, with the widespread use of full-color image forming apparatuses, highly glossy coated paper is often used, and in addition to this, OHP sheets and tracing paper are sometimes used.
[0003]
In such a situation, as a technique for preventing double feeding when using a recording sheet with high adhesion, in addition to separating a sheet taken out by a paper feed roll and a separation roll from other sheets, it is stacked on a sheet tray. A technique has been proposed in which separation of air is promoted by blowing an air flow onto the end face of a sheet accommodated and forming an air layer between the sheets (for example, Patent Document 1).
In addition, a shutter that can be moved in the vertical direction is provided at the airflow outlet, and the airflow is blown out while moving the shutter up and down to change the range of the airflow and operate to roll the stacked sheets. A technique for promoting separation is also disclosed (Patent Document 2).
Furthermore, when moving the shutter up and down as described above, a technique has been proposed in which the moving speed is changed in a predetermined pattern so that separation between the sheets is effectively performed in the upper layer portion of the stacked sheets. (Patent Document 3).
[0004]
[Patent Document 1]
JP-A-4-23747 [Patent Document 2]
Japanese Patent Laid-Open No. 11-5643 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-128300
[Problems to be solved by the invention]
However, in the conventional apparatus as described above, it is desired to further improve the following points.
By blowing an air flow from the side to the end faces of the laminated sheets, the sheets are separated so as to spread, and an effect of reducing the adhesion by generating an air flow between the sheets is obtained, but the surface smoothness is When using a high recording sheet or the like, it is difficult to sufficiently separate the sheets, and double feeding is likely to occur when the sheets are continuously fed out. In the above apparatus, the air flow state is set according to the thickness and type of the sheet before the image forming operation, and this setting cannot be changed until the image forming operation is completed. For this reason, even when double feeding occurs during operation, the sheets stacked and accommodated in the sheet tray cannot be more effectively separated, and multiple feeding occurs repeatedly during a predetermined number of image forming operations. There is a fear.
[0006]
The invention according to the present application has been made in view of the situation as described above, and when a large number of images are continuously formed, an air flow is appropriately blown to the side end surfaces of the stacked sheets, and more The purpose is to reliably prevent double feeding.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention according to claim 1 is directed to a sheet storage unit that stacks and stores sheets on which images are recorded, and a sheet stored in the sheet storage unit in order from the uppermost sheet. Sheet feeding means for feeding, and air blowing means for blowing air flow from the blowing port to the laminated end face of the sheet, having a blow-out opening facing the laminated end face of the sheets accommodated in the sheet containing means;
When two or more sheets sent out from the sheet storing means are sent in a state of being overlapped, a double feed sensor for detecting the double feed, and the sheet feeding means during the operation of feeding the sheets continuously. When the feeding sensor detects double feeding, the feeding of the sheet is temporarily stopped , and the double fed sheet is discharged without recording an image, and is stacked in the sheet storing means. spraying a predetermined time air flow to the end surface of the previous sheet fed from, so as to subsequently resume feeding of the sheet, and having a control means for controlling the sheet delivery means and the air blowing means sheet A supply device is provided.
[0008]
The control unit may temporarily stop sheet feeding every time the double feed sensor detects double feed once, or every time there are two or more predetermined times of double feed detection. You may go.
[0009]
In the sheet feeding device, when double feeding occurs during the operation of continuously feeding sheets, this is detected by a double feeding sensor, and the feeding of the sheets is temporarily stopped, and the stacked sheets in the sheet feeding means are stopped. By blowing an air flow on the end face for a predetermined time, the sheet can be rolled up and separated or lifted to reduce the adhesion between the sheets. Then, by sufficiently blowing air flow and restarting the sheet feeding in a state where the sheets have been separated, the sheet feeding means can feed the sheets one by one, and frequent feeding is frequently performed during the image forming operation. Can be suppressed.
[0010]
According to a second aspect of the present invention, there is provided: a sheet storing unit that stacks and stores sheets on which images are recorded; a sheet sending unit that sequentially feeds the sheets stored in the sheet storing unit from the uppermost sheet; An air blowing means that has an air outlet facing the laminated end face of the sheet accommodated in the accommodating means, and that blows an air flow from the air outlet to the laminated end face of the sheet; A blowing state changing means for changing an air flow state, a double feed sensor for detecting the double feed when two or more sheets sent from the sheet storing means are overlapped, and the sheet sending when the means detects a double feeding said double feed sensor during operation to feed a sheet continuously, temporarily stops the feeding of the sheet, heavy Has been discharged without recording an image on the sheet, the blowout state changing means changes the state of the air flow blown are laminated in the sheet accommodating means to the end face of the preceding sheet fed from said sheet containing means and, so as to resume the feeding of the sheet after spraying for a predetermined time airflow, to provide a sheet feeding apparatus characterized by a control means for controlling the sheet delivery means and the blowout state changing means.
[0011]
The air flow state includes air volume, wind speed, air temperature, air outlet size, air outlet position, shutter moving speed that changes the air outlet size or position, moving period, and movement speed change pattern. Etc.
[0012]
The change of the air flow blowing state is to change the above items when the air flow is blown at a constant air volume, wind speed, air temperature, blower outlet size, and blower outlet position. Alternatively, when the item is blowing while changing periodically, the change range, change cycle, and change pattern of the item may be changed. The balloon state may be changed every time the double feed sensor detects double feed once, or may be performed every time a predetermined number of double feeds are detected twice or more. .
[0013]
In the sheet feeding apparatus, when the double feed sensor detects double feed, the sheet feeding is temporarily stopped, the air blowing state is changed by the blowing state changing means, and an air flow more suitable for sheet separation is generated. Then, the sheet is sprayed to the end faces of the stacked sheets in the sheet feeding means for a predetermined time. Then, since a thick sheet or a highly glossy sheet with high adhesion between sheets is sufficiently dispersed within a predetermined time and then the sheet is fed again, occurrence of double feeding can be effectively suppressed.
[0014]
The invention according to claim 3 includes: the sheet supply device according to claim 1 or claim 2 ; and image recording means for recording an image on a sheet sent from the sheet supply device, wherein the control means is When the sheet sending by the sheet sending means is stopped, the image recording by the image recording means is stopped, and when the sheet sending is resumed, the sheet is scheduled to be recorded on the double fed sheet before the stop. An image forming apparatus is characterized in that control is performed so that images are sequentially recorded from the recorded images.
[0015]
In the image forming apparatus, when double feeding occurs, an image is not formed on the double fed sheet, the sheet feeding and the image recording by the image recording unit are stopped, and the end surfaces of the stacked sheets in the sheet feeding unit The air flow is sprayed on to promote the separation of the sheet. Then, when the sheet feeding is resumed, the sheets can be fed one by one, and the image that was scheduled to be recorded on the multi-fed sheet before the stop is recorded on the newly fed sheet. Sex can be secured.
[0016]
According to a fourth aspect of the present invention, in the image forming apparatus according to the third aspect of the present invention, the image forming apparatus further includes a display unit that displays a double feed occurrence state detected by the double feed sensor.
[0017]
The double feed occurrence state is data such as the number of occurrences and the number of the double feed, and the operator can check the double feed occurrence state by the display means.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of an image forming apparatus in which a sheet feeding apparatus according to the present invention is used.
The image forming apparatus includes a receiving unit 1 connected to an external device 5 such as an image reading device 4 or a personal computer via a communication line, and sends image information from the receiving unit 1 to the image recording control unit 2. The image recording unit 3 forms an image based on this image information, and forms a fixed image on the recording sheet.
[0019]
The image recording unit 3 forms an image by electrophotography, and the photosensitive drum 11 on which a latent image due to a difference in electrostatic potential is formed on the peripheral surface and the peripheral surface of the photosensitive drum 11 are combined. In this way, a charging roll 12 that is charged in a similar manner, an image writing device 13 that forms an electrostatic latent image by irradiating the uniformly charged photosensitive drum 11 with image light, and toner is transferred to the latent image on the photosensitive drum. Then, the developing device 14 for visualizing the image, the transfer device 15 for transferring the toner image formed on the photosensitive drum to the recording sheet, and fixing the recording sheet to which the toner image has been transferred by heating and pressurization to form a fixed image Device 16.
[0020]
In the lower part of the image recording unit 3, four sheet supply devices 17 are arranged up and down so that different size sheets or different types of sheets can be accommodated. The sheet fed from the sheet feeding device 17 is fed to the image recording unit 3 through the conveyance path 18, and after the toner image on the photosensitive drum is transferred by the transfer device 15, the sheet passes through the fixing device 16. Then, the paper is discharged to the paper discharge tray 19.
[0021]
2 is a schematic perspective view of the sheet feeding device 17, FIG. 3 is a cross-sectional view taken along the line AA shown in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB.
The sheet supply device 17 includes a sheet tray 21 (sheet storage unit) that stores and stacks a plurality of sheets, a sheet feed roll group 26 (sheet delivery unit) that feeds the sheets one by one from the sheet tray 21, and a sheet. A sheet guide 22 for regulating the position of the sheet in the tray 21; a bottom plate 23 for adjusting the upper surface of the stacked sheets provided at the bottom of the sheet tray 21 to a supply position having a predetermined height; and a sheet tray The air flow blowing device 24 that blows an air flow onto the end face of the sheets stacked and accommodated in the sheet 21, and when the sheets fed from the sheet tray 21 are fed in a state where two or more sheets are overlapped, this double feeding is performed. Based on the double feed sensor 25 to be detected and the detection signal from the double feed sensor 25, the paper feed roll group 26 and the airflow blowing device 24 are controlled. It has a control device 27. The detection signal of the double feed sensor 25 is also input to the image recording control unit 2, and the stop / re-start of the image forming operation is controlled based on this signal.
[0022]
The sheet S stored in the sheet tray 21 is stored in contact with the front wall body and the side wall body in the delivery direction, and the side wall surface serves as a side register (side release reference position). A sheet is sent out along the line. And the seat guide 22 is provided in the position facing these wall surfaces so that a movement is possible, the position was controlled with respect to the sheet | seat of a different size, and it was laminated | stacked on the said front side wall body and the side wall body. The end surfaces of the sheets are in contact with each other.
[0023]
The multi-feed sensor 25 detects, for example, the state in which two or more sheets are overlapped by measuring the thickness of the sheet on the conveyance path and the light transmittance, and is detected when multi-feed is detected. A signal is input to the control device 27. The double feed sensor 25 is provided downstream from the joining position of the respective conveyance paths 18 of the sheets sent out from the respective sheet supply devices 17, and is sent out from each sheet supply device 17 by one double feed sensor 25. It is possible to detect a double feed of a sheet.
[0024]
Further, a display device 6 for displaying the occurrence state of double feed detected by the double feed sensor 25 is provided, and this display device 6 is attached to an arbitrary place of the image forming apparatus, and the operator can display the display device 6. 6 can confirm the occurrence of double feeding. The double feed occurrence state is data such as the number of occurrences and the number of double feeds.
[0025]
The sheet feeding roll group 26 rotates in contact with the upper surface of the stacked sheets, and a pickup roll 26a that feeds the uppermost sheet, and a feeding roll that is provided on the downstream side and is driven in the sheet feeding direction. 26b, and a separation roll 26c that is in contact with the feeding roll 26b and driven in a direction opposite to the sheet feeding direction via a torque limiter. When the sheet fed by the pickup roll 26a is fed to the contact portion between the feeding roll 26b and the separation roll 26c, if the sheet is only one sheet, the sheet is driven by the feeding roll 26b. Since the rotational driving force conveyed by the friction with the sheet is conveyed in the feeding direction and exceeds the driving force transmission limit of the torque limiter, the separation roller 26c opposes the driving force applied to the separation roll 26c. Rotates in the delivery direction. When two or more sheets are overlapped and fed into the contact portion between the feeding roll 26b and the separation roll 26c, the driving force of the feeding roll 26b is transmitted to the uppermost sheet, but between the sheets. The lower sheet is separated from the upper sheet, and is conveyed in the direction opposite to the feeding direction by the driving force of the separation roll 26c and returns to the sheet tray 21.
[0026]
The airflow blowing device 24 assists the double feed prevention mechanism by the sheet feeding roll group 26 as described above, and an airflow blowout port 24a provided on the side wall surface of the sheet tray 21, and this A duct 24b that communicates with the air outlet 24a, a fan 24c that sends air into the duct 24b, a shutter 24d that changes the opening range of the air outlet 24a, and a drive device 24e that drives the shutter 24d in the vertical direction Is configured. And the adhesive force between the laminated | stacked sheet | seats by the said structure is reduced, and it is in the state which is easy to isolate | separate a sheet | seat.
[0027]
As shown in FIG. 3, the air flow outlet 24 a is set so as to blow an air flow from the side in the sheet feeding direction of the sheet tray 21, and is the uppermost surface of the sheets stacked in the sheet tray 21. It is provided at a position where an air flow can be blown to the end faces of the sheets stacked from the upper part.
[0028]
The fan 24c takes in air from the air introduction path 24f by rotation driving of the drive motor, and sends air flow to the outlet 24a through the duct 24b. Various types of fans such as an axial fan, a sirocco fan, and a crossflow fan are used. Various types can be used. A heater 24g is provided in the air introduction path 24f, and the air blown out is heated to promote the drying of the sheet. This is intended to prevent double feeding more effectively by reducing the adhesion between the sheets by drying the sheets.
[0029]
The shutter 24d restricts the air flow passing through the duct 24b in the vicinity of each outlet 24a, is supported so as to be movable in the vertical direction, and is driven by the driving device 24e. Then, by appropriately controlling the operation of the shutter 24d by the control device 27, the air volume of the air flow blown from the blowout port 24a and the blowout range are controlled to change with time, or the operation of the shutter 24d is stopped. Thus, the balloon can be arbitrarily set to a steady state.
[0030]
The driving device 24e for the shutter 24d drives the shutter 24d provided at the two outlets 24a independently, and drives the shutter 24d via a transmission mechanism. Based on a signal from the control device 27, each shutter 24d is controlled to perform an independent operation.
[0031]
Next, the operation of the sheet feeding device 17 will be described based on the flowchart shown in FIG.
When a signal for starting an image forming operation is input, first, driving of the fan 24c is started by the sheet supply device 17, and air is blown to the end face of the sheets stacked and accommodated in the sheet tray 21 by the air flow blowing device 24. A stream is sprayed (ST1). On the other hand, image information is sent from the receiving unit 1 to the image recording control unit 2 (ST2), and an operation of forming an image in the image recording unit 3 is started. Then, in synchronization with the image formation in the image recording unit 3, the sheet is fed from the sheet tray 21 by the sheet feed roll group 26 (ST3).
[0032]
When the sheet fed from the sheet tray 21 passes through a position facing the double feed sensor 25, it is determined by the double feed sensor 25 whether or not it is double feed (ST4). It is conveyed to the recording unit 3. In the image recording unit 3, a toner image is formed on the photosensitive drum based on the image signal, and the toner image is transferred and fixed on the sheet to form an image on the sheet (ST5). (ST6). Then, it is determined whether or not the number of images formed has reached a predetermined number set in advance (ST7). If the number has not yet reached the predetermined number, the next image formation is repeated.
[0033]
On the other hand, when double feed of the sheet is detected by the double feed sensor 25, a detection signal is output from the double feed sensor 25 to the control device 27, and from this control signal, the control device 27 outputs the sheet feed roll group 26 and the image recording. A control signal is output to the unit 3. Based on this control signal, the feeding of the sheet from the sheet tray 21 is stopped (ST8), and the image information that is scheduled to be recorded on the double-fed sheet is held in the image recording control unit 2 (ST9). ). The double fed sheet is discharged to a purge tray (not shown) without recording an image (ST10). Note that the double fed sheets may be discharged separately to the normal discharge tray 19 so as to be distinguished from other sheets.
[0034]
Next, based on the control signal from the control device 27, the operation of the sheet supply device 17 and the image recording unit 3 other than the air flow blowing device 24 is stopped (ST11), and the operation of the shutter 24d of the air flow blowing device 24 is performed. Is controlled (ST12). Then, the air volume and the blowing range of the air flow blown from the blowing port 24a are changed, and an appropriate air flow is continuously blown to the end surface of the sheets stacked in the sheet tray 21 for a predetermined time (ST13). The adhesion between them is reduced and the separation is promoted. When the predetermined time has elapsed (ST14), the operations of the paper feed roll group 26 and the image recording unit 3 are resumed (ST15), and the sheets are sent out from the sheet tray 21 one by one. On the sheet, images based on the image information held in the image recording control unit 2 are sequentially recorded from the image that is scheduled to be recorded on the multi-fed sheet (ST16).
[0035]
In this way, when the number of images formed on the sheet reaches a predetermined number (ST7), the number of double feeds generated during the image forming operation on the display device 6 included in the double feed sensor 25, and the double feed Is displayed (ST17), and the image forming operation is completed.
[0036]
When the double feeding occurs as described above, the sheet feeding and the operation in the image recording unit are temporarily stopped, and an appropriate air flow is blown to the end face of the sheets stacked in the sheet tray 21 for a predetermined time. Are sufficiently separated, the adhesive force is reduced, and sheet feeding is less likely to occur after the image forming operation is resumed. Further, the continuity of the image can be ensured by removing the double-fed sheets and recording an image based on the image information held in the newly fed sheet.
[0037]
Next, another operation pattern of the sheet feeding device 17 will be described.
In the operation pattern shown in FIG. 6, when double feeding is detected (ST24), paper feeding is stopped (ST28), and the image forming operation is stopped (ST31). Then, the operation of the shutter 24d of the airflow blowing device 24 is left at the start of image formation, and the airflow is blown onto the end surfaces of the sheets stacked in the sheet tray 21 for a predetermined time without changing the state of the airflow. After a predetermined time has elapsed (ST33), the image forming operation is resumed (ST34), and image recording on the next sheet is similarly continued.
[0038]
In general, when the sheet supply speed increases, the time during which the airflow is blown in the sheet tray 21 is shortened, and the sheet is sent from the sheet tray before the separation between the sheets and the reduction of the adhesion force are not sufficiently performed by the airflow. May cause double feeding. Such double feed is eliminated by setting the time for blowing the air flow sufficiently as described above, and subsequent double feed is prevented.
[0039]
FIG. 7 shows, as a reference example, another operation pattern having the effect of preventing the double feeding of sheets, which is outside the invention according to the present application. In this operation pattern, when double feeding is detected (ST44), the operation of the shutter 24d of the airflow blowing device 24 is controlled to change the state of the airflow (ST45). The sheet feeding is continued, but the image data is temporarily held without recording an image for the sheet that has undergone double feeding (ST46), and the sheet is discharged to the purge tray (ST47). Then, an image is recorded on the next fed sheet based on the image data that is scheduled to be recorded on the double fed sheet, and the subsequent image forming operations are sequentially continued.
[0040]
By operating as described above, the air flow is changed so as to be more easily separated, and the double feeding of the sheets sent out thereafter is prevented. Further, when double feed occurs again, the air flow further changes such as an increase in the air volume, and the state is changed to a state where double feed can be sufficiently prevented. Therefore, the state of the air flow is appropriately changed during the continuous operation, and frequent feeding can be prevented during the series of operations.
The operation pattern shown in FIG. 6 explains the operation of the sheet feeding apparatus according to the first aspect.
[0041]
【The invention's effect】
As described above, in the sheet supply device and the image forming apparatus according to the present invention, the double feeding of the sheet is detected by the double feeding sensor, and at this time, the feeding of the sheet is temporarily stopped, and the stacked sheets in the sheet storage unit are detected. A stream of air is blown onto the end face of the device for a predetermined time. Alternatively, the state of the air flow blown out from the air blowing means is changed. As a result, the sheets in the sheet storage means can be rolled up and separated, or floated to reduce the adhesion between the sheets, and the occurrence of double feeding can be suppressed again.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating an example of an image forming apparatus in which a sheet feeding apparatus according to the present invention is used.
FIG. 2 is a schematic perspective view of a sheet supply device used in the image forming apparatus shown in FIG.
FIG. 3 is a cross-sectional view taken along line AA shown in FIG.
4 is a cross-sectional view taken along line BB shown in FIG. 2. FIG.
FIG. 5 is a flowchart for explaining an operation pattern of the sheet feeding apparatus shown in FIG.
FIG. 6 is a flowchart illustrating another operation pattern of the sheet feeding apparatus shown in FIG.
FIG. 7 is a flowchart illustrating another operation pattern of the sheet feeding apparatus illustrated in FIG. 2 as a reference example .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reception part 2 Image recording control part 3 Image recording part 4 Image reading apparatus 5 External apparatus 6 Display apparatus 11 Photosensitive drum 12 Charging roll 13 Image writing apparatus 14 Developing apparatus 15 Transfer apparatus 16 Fixing apparatus 17 Sheet supply apparatus 18 Conveyance path 19 Paper discharge tray 21 Sheet tray 22 Sheet guide 23 Bottom plate 24 Air flow blowing device 24a Air outlet 24b Duct 24c Fan 24d Shutter 24e Drive device 24f Air introduction path 24g Heater 25 Double feed sensor 26 Paper feed group 26a Pickup roll 26b Feed Roll 26c Separation roll 27 Control device

Claims (4)

Sheet storage means for storing and storing sheets on which images are recorded;
Sheet delivery means for delivering the sheets accommodated in the sheet accommodation means in order from the uppermost sheet;
An air blowing means that has a blowout opening facing a laminated end face of the sheets accommodated in the sheet containing means, and blows an air flow from the blowout opening to the laminated end face of the sheet;
A multi-feed sensor that detects the multi-feed when two or more sheets sent out from the sheet storing means are sent in an overlapping state;
When the multi- feed sensor detects multi- feed during the operation in which the sheet sending means continuously sends out the sheet, the feeding of the sheet is temporarily stopped and an image is not recorded on the multi-feed sheet. discharged, is laminated to the sheet accommodating means blows predetermined time air flow to the end surface of the previous sheet fed from said sheet containing means, so as to subsequently resume feeding of the sheet, the sheet delivery means and the air And a control unit that controls the spraying unit. Sheet storage means for storing and storing sheets on which images are recorded;
Sheet delivery means for delivering the sheets accommodated in the sheet accommodation means in order from the uppermost sheet;
An air blowing means that has a blowout opening facing a laminated end face of the sheets accommodated in the sheet containing means, and blows an air flow from the blowout opening to the laminated end face of the sheet;
Blowing state changing means for changing the state of the air flow blown from the air blowing means;
A multi-feed sensor that detects the multi-feed when two or more sheets sent out from the sheet storing means are sent in an overlapping state;
When the multi- feed sensor detects multi- feed during the operation in which the sheet sending means continuously sends out the sheet, the feeding of the sheet is temporarily stopped and an image is not recorded on the multi-feed sheet. The sheet is discharged and the blowing state changing means changes the state of the air flow blown to the end face of the sheet before being stacked and sent out from the sheet storing means, and after blowing the air flow for a predetermined time , the sheet to the delivery resume, the sheet feeding apparatus characterized by a control means for controlling the sheet delivery means and the blowout state changing means. A sheet supply apparatus according to claim 1 or 2 ,
Image recording means for recording an image on a sheet sent from the sheet supply apparatus,
The control means stops the image recording by the image recording means when the sheet sending by the sheet sending means is stopped, and records on the multi-fed sheets before the stop when the sheet sending is resumed. An image forming apparatus that performs control so that images are sequentially recorded from an image that is scheduled to be performed. The image forming apparatus according to claim 3, further comprising a display unit configured to display a double feed occurrence state detected by the double feed sensor.

Images