JP5468874B2 - Image processing device - Google Patents

Description

  The present invention relates to an image processing apparatus having a paper feed cassette for loading media.

  A conventional image processing apparatus includes a loading plate that is displaced according to the remaining amount loaded on a detachable sheet feeding cassette, and the amount of remaining medium is determined on the front surface of the sheet feeding cassette by the position of a display needle linked to the loading plate. There is one that displays on a display window provided on the side (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-32353 (paragraphs “0014” to “0017”, FIG. 1)

  However, in the conventional technology described above, a display window for displaying the remaining amount of the medium is formed on the front surface of the sheet cassette, and the sheet cassette is disposed at the lower part of the apparatus, so that the user operates the apparatus. There is a problem that it is difficult to check the remaining amount of the medium in the paper feed cassette disposed at the lower part of the apparatus from above the front of the apparatus main body.

  An object of the present invention is to solve such problems, and an object of the present invention is to make it possible to easily check the remaining amount of media in a paper feed cassette.

Therefore, according to the present invention, when a paper feed cassette having a stacking plate on which a medium is placed is mounted, the medium placed on the stacking plate is lifted by the urging means with the lock mechanism released to the paper feeding unit. In the image processing apparatus to be raised, a paper feed cassette mounting detection unit that detects the mounting of the paper feed cassette, a medium rise detection unit that detects that the medium placed on the stacking plate has risen to the paper feed unit, The rising speed regulating means for regulating the raising speed of the loading plate by the biasing means, and the medium rising detection means detects the rising of the medium after the paper feeding cassette loading detecting means detects the loading of the paper feeding cassette. and time measuring means for measuring a time until, and control means for deriving a medium amount of paper feed cassettes on the basis of the time measured by said time measuring means, the paper feed cassette attachment detection means, removable Medium size detection means for detecting the size of the medium placed on the stacking plate of the paper feed cassette by detecting the pressing of the projections provided on the active paper feed cassette, The paper feed cassette mounting detection means is arranged so that the position of the paper feed cassette that detects the pressing of the protrusion is substantially coincident with the position of the paper feed cassette that releases the lock mechanism that restricts the lifting of the stacking plate. It is characterized by.

  According to the present invention as described above, it is possible to easily check the remaining amount of the medium in the paper feed cassette.

1 is a block diagram illustrating a configuration of a control system of an image processing apparatus according to a first embodiment. Sectional drawing of the image processing apparatus in 1st Example The principal part perspective view of the paper feed cassette in 1st Example The perspective view of the medium size sensor in a 1st Example. Explanatory drawing of the medium size sensor in 1st Example Sectional drawing of the paper feed cassette in the first embodiment Time chart when the paper cassette is mounted in the first embodiment The graph which shows the relationship between the detection time of the sensor in 1st Example, and a medium load amount Explanatory drawing which shows operation | movement of the gear of the paper feed cassette in 1st Example. Explanatory drawing which shows the example of a display of the display part in 1st Example. The perspective view of the paper feed cassette in the second embodiment The perspective view of the paper feed cassette in the second embodiment The graph which shows the relationship between the detection time of the sensor in 2nd Example, and a medium load amount

  Embodiments of an image processing apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the control system of the image processing apparatus in the first embodiment, and FIG. 2 is a sectional view of the image processing apparatus in the first embodiment. In this embodiment, the image processing apparatus will be described as an electrophotographic printer.

  1 and 2, the control unit 29 is composed of a microcomputer or the like, and controls the overall operation of the image processing apparatus 100 based on a control program stored in a storage unit 30 such as a memory.

  The control unit 29 includes detection sensors 22, 23, 24, 25, and 26 connected to the control unit 29, a medium presence / absence sensor 70 that detects the presence / absence of a medium by contacting the medium stored in the paper feed cassette 1, The position of the medium, the presence / absence of the medium in the paper feed cassette 1, and the size of the medium are confirmed by a signal from a medium size sensor 71 that detects the size of the medium stored in the paper feed cassette 1.

  The control unit 29 also includes a charging roller 43 and a developing roller 44 in the developing units 42K, 42Y, 42M, and 42C for each color of black (K), yellow (Y), magenta (M), and cyan (C), and a transfer unit. A roller 45, a print head 47 using LED (Light Emitting Diode) as a light source, a fixing device 48, a fixing motor 46, a transfer motor 52, a drum motor 53, a paper feed motor 54, a transport motor 55, etc., not shown in FIG. Various motors, such as an exhaust fan 49 and an intake fan 50 not shown in FIG. 2, are controlled.

  Further, the control unit 29 performs processing for generating image data in accordance with print data and control commands input via an IF (interface) unit 32 for inputting an input signal from an external device, and generates the generated image. Data is output to the print control unit 37.

  The display unit 31 is a display unit such as a liquid crystal display on an operation panel arranged at the upper front of the image processing apparatus 100 and displays the state of the image processing apparatus 100 and the like. Further, input means such as a touch panel and operation buttons are arranged in the vicinity of the display unit 31 so that operations for setting and changing various settings can be received.

  The print control unit 37 receives the image data output from the control unit 29 and sends the image data to the print head 47.

  The print head 47 performs light emission control of the LED based on the sent image data, and the image data such as characters and figures is transferred onto the surface of the photosensitive drum 20 charged by the charging roller 43 as an electrostatic latent image of a dot image. Form as.

  The motor controller 36 controls the various motors of the fixing motor 46, the transfer motor 52, the drum motor 53, the paper feed motor 54, and the carry motor 55 in the image processing apparatus 100 to feed the medium. 11, the transport rollers 12, 14, 15, 16, 17, the photosensitive drum 20, the developing roller 44, the transfer roller 45, the transfer belt 57, and the fixing device 48.

  The fan control unit 39 includes an exhaust fan 49 (not shown in FIG. 2) arranged at the rear of the apparatus and an intake fan 50 (not shown in FIG. 2) arranged at the front of the apparatus according to the state of the apparatus. Control.

  The photosensitive drum 20 is rotated by a drum motor 53 (not shown in FIG. 2) according to an instruction from the motor control unit 36, and is uniformly charged by an operation of the charging roller 43 according to an instruction from the charging drive control unit 33. As a result, an electrostatic latent image is formed on the surface.

  The electrostatic latent image formed on the surface of the photosensitive drum 20 is transferred to toner cartridges 56K, 56Y, 56M, and 56C at portions corresponding to the electrostatic latent image by a developing roller 44 controlled by an instruction from the development drive control unit 34. The toner as the developer supplied from is attached, and a toner image is formed.

  A voltage is applied to the toner image formed on the surface of the photosensitive drum 20 by the transfer roller 45 controlled by an instruction of the transfer drive control unit 35, and the toner image is transferred to the medium.

  On the other hand, the medium onto which the toner image is transferred is placed on the stacking plate 2 of the paper feed cassette 1 and pressed against the paper feed roller 11 by the spring 2a. When a paper feed motor 54 (not shown in FIG. 2) is rotated by an instruction from the motor control unit 36, the detection sensor 23 synchronizes with each other to drive the paper feed rollers 10 and 11 and the transport rollers 12 and 14, thereby causing the photosensitive drum 20 to rotate. The toner image formed on the surface of the photosensitive drum 20 is transferred between the transfer belt 57 and the transfer belt 57.

  Further, the medium onto which the toner image has been transferred is conveyed to a fixing device 48 driven by a fixing motor 46. In response to an instruction from the fixing drive control unit 38, the fixing device 48 presses and heats the toner image transferred onto the medium by the transfer roller 45 to fix the toner image. The medium on which the toner image is fixed is discharged out of the apparatus by the transport rollers 15, 16, and 17.

  The toner remaining on the surface of the photosensitive drum 20 after the toner image is transferred is cleaned by the cleaning blade 58, and the cleaned photosensitive drum 20 is charged again by the operation of the charging roller 43.

  In this way, the control unit 29 controls a series of operations of the image processing apparatus 100 and repeats the above-described operations until there is no print data from the IF unit 32.

  Next, the perspective view of the main part of the paper feed cassette 1 in the first embodiment of FIG. 3, the perspective view of the medium size sensor in the first embodiment of FIG. 4, and the first embodiment of FIG. FIG. 6 is an explanatory diagram of the medium size sensor, and FIG. 6 is a cross-sectional view of the paper feed cassette according to the first embodiment.

  In FIG. 3, a medium size dial 7 for a user to set a medium size is rotatably supported on the front surface of the paper feed cassette 1. The medium size dial 7 is disposed so as to face the medium size sensor 71 having a 4-bit information amount fixed to the main body frame 80 of the image processing apparatus 100 as shown in FIGS. When the cassette 1 is mounted on the main body of the apparatus, the projection 7a set for each medium size by the medium size dial 7 turns on (press) / off (non-press) each button of the medium size sensor 71. The medium size sensor 71 can detect the size of the medium stored in the paper feed cassette 1 by each button turned on / off. Accordingly, the medium size sensor 71 functions as a sheet cassette mounting detection unit that detects the size of the medium stored in the sheet cassette 1 and detects that the sheet cassette 1 is mounted on the apparatus main body.

  In addition, the sheet feeding cassette 1 rotates in synchronization with the loading plate 2 configured to be rotatable at a rotation fulcrum (rotation fulcrum 2b shown in FIG. 2), a shaft 72 interlocked with the rotation of the loading plate 2, and the shaft 72. The gear 6 that meshes with the gear 6, the ratchet gear 74 that has a large and small two-stage gear structure that is coaxial with the gear 5, the gear 4 that meshes with the gear 5, and the small gear of the ratchet gear 74 that meshes with the gear. 4 and a gear 75 coaxial with the gear 4 and the damper gear 3 that meshes with the gear 75 and is connected to the damper mechanism.

  The gear 75 is a one-way clutch mechanism with the gear 4 and is interlocked only in one direction counterclockwise in the figure.

  A lock lever 8 as a lock mechanism is rotatably attached to a fulcrum portion 73 of the paper feed cassette 1, and one end thereof is urged upward by a spring 9 in the drawing. When one end is lifted upward in the figure by the spring 9, the other end of the lock lever 8 engages with the large gear of the ratchet gear 74, and the ratchet gear 74 is fixed to fix the free end of the stacking plate 2. Regulate the rise of

  When the paper feed cassette 1 is pulled out of the apparatus main body due to medium supply or the like, the shaft 72 is pulled down by a guide provided in the apparatus main body (not shown). At this time, the gear 6 rotates in the clockwise direction in the drawing, the gear 5 rotates in the counterclockwise direction in the drawing, and the gear 4 rotates in the clockwise direction in the drawing in conjunction with the shaft 72, but the gear 75 rotates idle.

  When the paper feed cassette 1 is pulled out from the apparatus main body and released from the guide, the gears try to rotate in the direction of pushing up the stacking plate 2 by the spring 2a shown in FIG. Since the ratchet gear 74 is fixed in the direction in which the gear 4 and the gear 75 are interlocked, the rotation of the gears is restricted and the stacking plate 2 is held at the lower limit position.

  When the paper feed cassette 1 is mounted on the apparatus main body, as shown in FIG. 6, the engaging portion of the lock lever 8 fixing the ratchet gear 74 is pushed up by the guide roller 77 interlocked with the paper feed roller unit 76, and the ratchet The projection of the gear 74 is released and the projection 7a set by the medium size dial 7 turns each button of the medium size sensor 71 on (pressed) / off (non-pressed). It is detected that is attached to the main body of the apparatus.

  The timing at which the engagement portion of the lock lever 8 is pushed up by the guide roller 77 to release the fixing of the ratchet gear 74 and the timing at which the medium size sensor 71 detects that the paper feed cassette 1 is mounted on the apparatus main body are substantially omitted. A guide roller 77, a lock lever 8, and a medium size sensor 71 are arranged so as to be simultaneously. That is, the position of the paper feed cassette 1 where the medium size sensor 71 detects the pressing of the protrusion 7 a and the engaging portion of the lock lever 8 are pushed up by the guide roller 77 interlocking with the paper feed roller unit 76, and the ratchet gear 74 The guide roller 77, the lock lever 8, and the medium size sensor 71 are arranged so that the position of the paper feed cassette 1 to be fixed is substantially coincident.

  When the ratchet gear 74 is unlocked, the gears rotate, and the stacking plate 2 biased by the spring is lifted. At this time, the rising speed of the stacking plate 2 is regulated by a damper mechanism as a rising speed regulating means.

  The lifted stack 2 lifts the paper feed roller unit 76, so that the guide roller 77 also rises in conjunction with it, and the lock lever 8 pressed by the guide roller 77 rotates in a direction to engage with the ratchet gear 74, The ascent of the loading plate 2 also stops.

  When the stacking plate 2 rises, the medium placed on the stacking plate 2 rises to the paper feed roller 11 as the paper feeding means, and the medium comes into contact with the medium presence sensor 70 so that the presence of the medium can be detected. It has become. Therefore, the medium presence / absence sensor 70 also functions as a medium rise detection unit that detects that the medium placed on the stacking plate 2 has risen to the paper feed roller 11.

  The control unit 29 detects that the paper feed cassette 1 is mounted on the apparatus main body by the medium size sensor 71, and then the medium placed on the stacking plate 2 rises up to the paper feed roller 11 by the medium presence / absence sensor 70. A timer is provided as a time measuring means for measuring the time until it is detected.

  The operation of the above configuration will be described.

  FIG. 7 is a time chart when the paper feed cassette is mounted in the first embodiment, FIG. 8 is a graph showing the relationship between the detection time of the sensor and the medium loading amount in the first embodiment, and FIG. 9 is in the first embodiment. It is explanatory drawing which shows operation | movement of the gear of a paper feed cassette. FIG. 9A shows the operation of the gear when the stacking plate rises, and FIG. 9B shows the operation of the gear when the stacking plate is stopped.

  When the paper feed cassette 1 is mounted on the apparatus main body, the guide roller 77 presses the lock lever 8 as shown in FIG. 9A, whereby the engagement of the lock lever 8 with the ratchet gear 74 is released. Then, the fixing of the gears is released, and the stacking plate 2 starts to rise. At the same time, the control unit 29 confirms that the medium size is determined by the projection of the medium size dial 7 pressing the button part of the medium size sensor 71 and that the paper feed cassette 1 is mounted on the apparatus main body. . The point in time when the sheet feeding cassette 1 is mounted on the apparatus main body and the stacking plate 2 starts to rise is set as timing Ts as shown in FIG.

  As the stacking plate 2 rises, the control unit 29 detects the medium placed on the stacking plate 2 by the medium presence sensor 70. The point in time when the stacking plate 2 is raised and the medium is detected by the medium presence / absence sensor 70 is defined as a timing Tp as shown in FIG.

  When the stacking plate 2 continues to rise, the paper feed roller unit 76 is pushed by the stacking plate 2 and lifted. Since the guide roller 77 is separated from the lock lever 8 when the paper feed roller unit 76 is lifted beyond a predetermined height, the end of the lock lever 8 held by the guide roller 77 is also a spring around the fulcrum 73. 9 is pushed up. The lock lever 8 whose end is pushed up engages with the ratchet gear 74 at the opposite end of the fulcrum 73, so that the rotation of the gears is fixed and the stacking plate 2 is raised. Stop.

  In an example of a paper feed cassette having a medium capacity of 500 sheets, the medium presence sensor 70 detects whether the medium is present from the timing when the medium size sensor 71 detects the size of the medium, that is, the timing Ts when the paper feed cassette is mounted on the apparatus main body. The relationship between the detected time T until the timing Tp and the amount of loaded media (ratio of the amount of medium to the medium capacity (%)) is as shown in the graph of FIG.

  From the relationship between the time T and the amount of loaded media, the control unit 29 serving as a control unit derives the amount of loaded media loaded on the loading plate 2. For example, the control unit 29 measures the time T from the timing Ts when the medium size sensor 71 detects the size of the medium to the timing Tp when the medium presence sensor 70 detects the presence of the medium, and the measured time T and the loading of the medium The loading amount of the medium may be derived based on a predetermined calculation formula representing the relationship with the amount, or the relationship between the time T and the loading amount of the medium is stored in the storage unit 30 in advance as a data table. Alternatively, the control unit 29 may search the data table in the storage unit 30 based on the measured time T and derive the medium loading amount.

  The control unit 29 is arranged on the front upper portion of the image processing apparatus 1 based on the derived load amount, for example, as shown in FIG. 10, and is divided into five levels on the display unit 31 of the operation panel that receives user operations. Is displayed. The remaining amount of the medium indicates 100% of the remaining amount of the medium when all the lights are on, and indicates that the remaining amount of the medium decreases by 20% for each step.

  For example, when the control unit 29 measures that the time T is 100 ms when a paper cassette having a medium capacity of 500 sheets is mounted on the apparatus main body, the loading amount of the medium is 100% based on the time T (see FIG. 8, the remaining amount of the medium is 100% when the time T is 100 ms), and the remaining amount of the medium is lit on the display unit 31 of the operation panel to display that the remaining amount of the medium is 100%.

  Thereafter, the control unit 29 counts the number of media to be printed, calculates the remaining amount of the medium, and updates the remaining amount of the medium displayed on the display unit 31 of the operation panel. For example, when 100 sheets of media are printed, the remaining amount of the medium is set to 80% and displayed on the display unit 31 of the operation panel.

  Each time the paper feed cassette 1 is mounted on the apparatus main body, the remaining amount of the medium is reset and displayed on the display unit 31 of the operation panel. Further, when the thickness of the medium in the paper feed cassette 1 can be detected, the number of media can be displayed.

  Here, it is preferable that the ascending speed of the stacking plate 2 is a substantially constant speed regardless of the number of loaded media. In addition, there is a case where the ascending speed of the loading plate 2 varies depending on the type of medium, the environmental temperature, and the like, but the time T when the medium is not loaded and the maximum loading time for each type of medium and the environmental temperature is determined in advance. It is also possible to measure and correct the medium loading amount based on the time T.

  As described above, the control unit 29 measures the time T from the timing Ts when the medium size sensor 71 detects the size of the medium to the timing Tp when the medium presence sensor 70 detects the presence of the medium, and based on the measured time T. A data table stored in advance in the storage unit 30 is searched to extract the amount of loaded media, and the remaining amount of media divided into five stages is displayed on the display unit 31 of the operation panel based on the extracted loaded amount. Thus, the user can easily store the remaining media in the paper cassette 1 without adding new members, that is, without adding new sensors using the existing medium size sensor 71 and the medium presence sensor 70. The amount can be easily confirmed.

  As described above, in the first embodiment, the time from when the paper feed cassette is mounted to the apparatus main body until the presence of the medium is detected by the medium presence sensor is measured, and the medium extracted based on the time is measured. In this case, the user can easily check the remaining amount of the medium in the paper feed cassette.

  11 and 12 are perspective views of the paper feed cassette in the second embodiment, and FIG. 12 is a perspective view of the paper feed cassette with the stacking plate removed. The configuration of the second embodiment is configured to include springs 90 and 91 as biasing means for biasing the stacking plate 2 upward instead of the spring 2a in the configuration of the first embodiment shown in FIG. Is. A configuration different from the configuration of the first embodiment will be described below, and portions similar to those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 12, two springs 90 for biasing the stacking plate 2 upward are attached to both sides of the paper feed cassette 1, and one spring 91 for biasing the stacking plate 2 upward is attached to the central portion of the paper feed cassette 1. It has been. The spring 91 has a shorter free length than the spring 90 and acts only at the initial stage of the lifting operation of the stacking plate 2, and the spring 90 is formed so as to act on the entire movable range of the stacking plate 2.

  Therefore, the spring 91 functions as an ascending speed adjusting means for adjusting the ascending speed of the stacking plate 2 restricted by the damper mechanism.

  The operation of the above-described configuration will be described based on FIGS. 12 and 13 with reference to FIG.

  As shown in FIG. 8 described in the first embodiment, the relationship between the rising time of the stacking plate 2 and the load amount of the medium is not linear, and at the initial stage of the operation of lifting the stacking plate 2, a constant increase is caused by the characteristics of the damper. It takes time to move to speed. In particular, when the amount of loaded media is large, the raising operation of the loading plate 2 tends to be delayed.

  In order to compensate for this, the spring 91 acts to urge the stacking plate 2 upward to correct the initial delay in the lifting operation of the stacking plate 2 and to keep the rising speed of the stacking plate 2 constant. It becomes possible to keep on.

  With this configuration, as shown in FIG. 13, the stacking plate 2 rises at a constant speed regardless of the stacking amount of media, and the control unit 29 of the image processing apparatus 1 is based on a predetermined calculation formula. By calculating the load amount of the medium, it becomes possible to display the more accurate load amount of the medium on the display unit as the remaining amount of the medium as compared with the first embodiment.

  The operation of the image processing apparatus 1 and the operation of displaying the remaining amount of medium divided into five stages on the display unit 31 of the operation panel based on the loading amount derived based on the time T measured by the control unit 29 are the first. Since it is the same as that of an Example, the description is abbreviate | omitted.

  As described above, in the second embodiment, by providing a spring for correcting the initial delay in the lifting operation of the stacking plate, in addition to the effects of the first embodiment, a more accurate remaining amount of medium can be displayed on the display unit. The effect that it can be displayed is obtained.

  In the first and second embodiments, the image processing apparatus has been described as a printer. However, the image processing apparatus is not limited thereto, and may be a facsimile, a copier, or a multifunction peripheral (MFP).

DESCRIPTION OF SYMBOLS 1 Paper feed cassette 2 Loading plate 3 Damper gear 4, 5, 6 Gear 7 Medium size dial 8 Lock lever 9 Spring 10, 11 Paper feed roller 12, 14, 15, 16, 17 Conveyance roller 20 Photosensitive drum 44 Development roller 45 Transfer roller 47 Print Head 48 Fixing Device 57 Transfer Belt 70 Medium Presence Sensor 71 Medium Size Sensor

Claims (11)

In an image processing apparatus that, when a paper feed cassette having a stacking plate on which a medium is placed is attached, raises the stacking plate by an urging unit to raise the placed medium to the paper feeding unit.
A paper cassette mounting detection means for detecting the mounting of the paper cassette;
Medium rise detection means for detecting that the medium placed on the loading plate has risen to the paper feed means;
An ascending speed regulating means for regulating the ascending speed of the loading plate by the urging means;
A time measuring means for measuring a time from when the paper feed cassette attachment detecting means detects the attachment of the paper feed cassette until the medium rise detecting means detects the rise of the medium;
Control means for deriving the amount of medium in the sheet cassette based on the time measured by the time measuring means ,
The paper feed cassette mounting detection means is a medium size detection means for detecting the pressure of a protrusion provided on a removable paper feed cassette and detecting the size of a medium placed on a stacking plate of the paper feed cassette. ,
The paper feed cassette mounting detection means detects the pressing of the protrusion, and the paper feed cassette position so that the position of the paper feed cassette that releases the lock mechanism that restricts the lifting of the stacking plate substantially coincides. An image processing apparatus comprising a paper cassette mounting detection means . The image processing apparatus according to claim 1.
The control means displays the derived medium amount in the paper feed cassette on a display unit of an operation panel. The image processing apparatus according to claim 1 or 2 ,
The medium rise detection means is a medium presence / absence detection means for detecting the presence / absence of the medium in contact with the medium placed on the stacking plate of the paper feed cassette raised to the paper feed means. apparatus. The image processing apparatus according to any one of claims 1 to 3 ,
The image processing apparatus according to claim 1, wherein the ascending speed regulating means is a damper mechanism. The image processing apparatus according to any one of claims 1 to 4 ,
An image processing apparatus, comprising: an ascending speed adjusting means for adjusting an ascending speed of the stacking plate regulated by the ascending speed regulating means. The image processing apparatus according to claim 5 .
The image processing apparatus according to claim 1, wherein the ascending speed adjusting means is an urging means that acts at an initial stage of the ascending operation of the stacking plate. In an image processing apparatus that, when a paper feed cassette having a stacking plate on which a medium is placed is attached, raises the stacking plate by an urging unit to raise the placed medium to the paper feeding unit.
A paper cassette mounting detection means for detecting the mounting of the paper cassette;
Medium rise detection means for detecting that the medium placed on the loading plate has risen to the paper feed means;
An ascending speed regulating means for regulating the ascending speed of the loading plate by the urging means;
A time measuring means for measuring a time from when the paper feed cassette attachment detecting means detects the attachment of the paper feed cassette until the medium rise detecting means detects the rise of the medium;
Control means for deriving the amount of medium in the paper cassette based on the time measured by the time measuring means;
An ascending speed adjusting means for adjusting the ascending speed of the loading plate regulated by the ascending speed regulating means,
The image processing apparatus according to claim 1, wherein the ascending speed adjusting means is an urging means that acts at an initial stage of the ascending operation of the stacking plate. The image processing apparatus according to claim 7.
The control means displays the derived medium amount in the paper feed cassette on a display unit of an operation panel . The image processing apparatus according to claim 7 or 8,
The paper feed cassette mounting detection means is a medium size detection means for detecting the pressure of a protrusion provided on a detachable paper feed cassette and detecting the size of the medium placed on the stacking plate of the paper feed cassette. An image processing apparatus. The image processing apparatus according to any one of claims 7 to 9,
The medium rise detection means is a medium presence / absence detection means for detecting the presence / absence of the medium in contact with the medium placed on the stacking plate of the paper feed cassette raised to the paper feed means. apparatus. The image processing apparatus according to any one of claims 7 to 10,
The image processing apparatus according to claim 1, wherein the ascending speed regulating means is a damper mechanism.

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