JPH0569985A - Paper feeder - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to enable determination of whether or not the detected position of the guide fence corresponds to the edge of the sheet actually stacked, and to stack the stacked sheets. The purpose of the present invention is to obtain a sheet feeding device having a structure capable of preventing a sheet feeding error due to the positions of the guide fence and the guide fence not corresponding. According to the present invention, a sheet storage unit 1 capable of storing a plurality of sheets of different sizes is provided so as to be slidable at least in the width direction of stacked sheets S and contact the edge of the sheets. Therefore, in the paper feeding device having the edge regulating member 2 for regulating the edge, the edge regulating member 2 detects the correspondence of the paper S to the position where the edge regulating member 2 is set. The structure 3 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device, and more particularly to a structure for detecting the size of sheets contained therein.

[0002]

2. Description of the Related Art As is well known, a sheet feeding device in an image forming apparatus such as a copying machine or a printer is provided with a structure capable of detecting the size of a sheet contained in a sheet feeding cassette.

FIG. 15 is a schematic view showing the outline of the above-mentioned detection structure. This structure is slidable in the paper feed cassette, for example, so as to face the side edge of the paper and the trailing edge in the paper feed direction. , A side guide fence A and a rear guide fence B that regulate the position of the edge by abutting are provided,
In the sliding path of each of the fences A and B, as shown in FIG. 16, the common electrodes C1 and C2 and the detection electrodes D1 to D4 arranged at positions where the sizes of the side edge and the trailing edge of each sheet can be determined. And E1 to E4 are provided, and a conductive contact piece F is provided on the side of the guide fence that abuts on each electrode. The wiring from each of the electrodes described above is connected to a control unit (not shown), and the position of the guide fence when a closed circuit is formed by the correspondence between the common electrode C and the detection electrodes D and E is set via the control unit. It is designed to be displayed (for example, Japanese Utility Model Laid-Open No. 64-18063).

Further, the above-mentioned connection state between the electrodes and the contact piece on the side of the guide fence is not detected, but in addition to this, as shown in FIG. 15, as shown in FIG. A photointerrupter G having a face with a filer having a habit of protruding from this face as a normal state.
In some cases, the presence or absence of the sheet is detected by detecting the interruption of the optical path of the photo interrupter G when the filler is pushed down from the mounting surface due to the weight of the sheet.

[0005]

However, in the above-described size detecting structure, although the setting state of the guide fence with respect to the edge of the sheet can be detected by indexing the position of the guide fence, it is possible to detect the state of the sheet on the guide fence. Since there is no structure for determining whether the edges correspond to each other, the correspondence between the actual paper edge and the guide fence cannot be identified. Therefore, simply detecting only the position of the guide fence may not be sufficient to correspond to the edge of the sheet, in other words, the edge of the sheet may not be regulated by the guide fence. Since there is a space between the edge of the paper and the guide fence, there is a risk that the paper may be skewed during paper feeding or the paper may be misaligned.

Further, as shown in FIG. 15, in the structure in which the presence or absence of the paper is detected at a special place, even if the position setting corresponding to the paper size is performed by the above-mentioned edge regulating member. Also, it is not possible to determine whether the paper corresponds to the position, and as a result, as in the case described above, it is not possible to regulate the position of the edge of the paper at the time of feeding, and the skew of the paper or There was a risk of misalignment.

Therefore, an object of the present invention is, in view of the above-mentioned problems in the conventional sheet feeding device, particularly in the guide fence position detecting structure, that the detected guide fence position is located at the edge of the sheet actually stacked. To obtain a sheet feeding device having a structure capable of discriminating whether or not they correspond to each other and preventing a feeding error due to the positions of stacked sheets and the guide fence not corresponding to each other. It is in.

[0008]

In order to achieve this object, the present invention has a sheet storage section capable of storing a plurality of sheets of different sizes and is slidable at least in the width direction of stacked sheets. In a paper feeding device having an edge regulating member which is provided and regulates the edge by abutting against the edge of the sheet, the edge regulating member is provided with respect to the position where the edge regulating member is set. It is characterized in that a structure is provided for detecting the correspondence between the sheets.

Further, according to the present invention, as a structure for detecting the correspondence between the sheets in the edge regulating member, a reflection type optical sensor exposed on the sheet mounting surface side of the edge regulating member is provided.

Further, the present invention is characterized in that the reflective optical sensor is adapted to detect the presence / absence of stacked sheets.

According to the present invention, a sheet storage unit capable of storing a plurality of sheets of different sizes is provided, and the sheet is slid toward the edge of the sheet in accordance with the size and direction of the sheet to be stored. An edge regulating member that regulates the position of the edge in the longitudinal direction, and a regulating member position detection unit that detects whether the edge regulating member is in a predetermined position with respect to the upper position, and Based on the sheet size detection means for detecting the size and direction of the sheet accommodated by the position of the edge regulation member set according to the width and length of the sheet, and the detection result from the edge regulation member, It is characterized in that it is provided with a means for discriminating the authenticity of the detection result of the paper size detecting means.

Further, according to the present invention, when the discriminating means corresponds to the case where the detection result of the regulating member position detecting means detects that the edge regulating member is located at a predetermined position with respect to the sheet, the sheet is detected. When it is determined that the detection result by the size detection means is valid, and on the other hand, the detection result of the restriction member position detection means corresponds to the case where it is detected that the edge restriction member is not located at the predetermined position with respect to the paper,
It is characterized in that the detection result by the paper size detecting means is invalidated.

Further, according to the present invention, in a sheet feeding device capable of accommodating a plurality of sheets of different sizes, it is slidable in a direction in which it abuts against an edge of the sheet in accordance with the size and direction of the sheet accommodated. An edge regulating member that regulates the position of the edge of the sheet, and the edge regulating member is at a predetermined position with respect to the sheet, and the sheet exists facing the edge regulating member. It is characterized in that it is provided with a paper size discriminating means for outputting a signal according to the position of the edge regulating member.

Further, according to the present invention, the paper size discriminating means is
It is characterized in that the paper size can be detected by detecting this when the paper is stored, and the paper size cannot be detected when the paper is not stored.

Further, the present invention is a sheet feeding device capable of accommodating a plurality of sheets of different sizes and provided with a sheet feeding cassette which can be inserted into and removed from an apparatus which requires the sheet,
An edge regulating member that is slidable in a direction in which the position changes according to the size of the accommodated paper and that regulates the position and orientation of the edge corresponding to the size of the paper, and the width direction and the length in the size of the paper. Regulating member position detecting means for detecting whether or not the edge regulating member corresponding to the edge in the vertical direction is at a predetermined position with respect to each edge of the sheet, and sheet presence detecting means for detecting the presence or absence of the sheet And is configured to perform the position detection of the edge regulation member by the regulation member position detection means when the paper feed cassette is not attached to the apparatus main body.

Further, according to the present invention, it is possible to mount the paper feed cassette on the mounting portion of the paper feed cassette on the side of the apparatus requiring the paper according to the detection results of the regulating member position detection means and the paper presence / absence detection means. It is characterized in that a switching means is provided for switching between the position and the impossible position.

[0017]

According to the present invention, when the position of the edge regulating member set according to the size of the sheet is detected, whether the size of the sheet corresponding to the position of the edge regulating member is accommodated is detected. If the sheet is detected and there is no sheet at the position of the edge regulating member, it can be determined that the setting of the edge regulating member is wrong.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below with reference to FIGS.

FIG. 1 shows a sheet feeding cassette 1 which is a main part of a sheet feeding device according to an embodiment of the present invention. The sheet feeding cassette 1 can accommodate sheets of different sizes. Therefore, a guide hole 1A is formed on the bottom surface of the paper feed cassette 1 at least along the width direction of the paper.
A side guide fence 2 that is an edge regulation member for regulating the edge position of the paper S in the width direction is slidably provided in the guide hole 1A.

The side guide fence 2 described above is shown in FIG.
As shown in FIG. 2, a bottom piece 2A formed of an angle piece and located on the side of the sheet placement surface of the piece is provided with a structure for detecting the facing relationship between the side guide fence 2 and the sheet S. is there. That is, in the case of this embodiment, the above-mentioned correspondence detection structure is composed of the optical sensor 3 attached to the hole formed in the bottom piece 2A.
Is a reflective type including a light emitting element and a light receiving element. The optical sensor 3 can be linked with the side guide fence 2 and the guide fence 2
The correspondence with the paper can be detected according to the position of
In this correspondence relationship, the presence / absence of paper can also be detected.

Since this embodiment has the above configuration,
For example, the case of stacking sheets on the basis of one side in the width direction will be described. When the side guide fence 2 is positioned to accommodate the sheets in accordance with the lateral position of the sheets to be accommodated, the case shown in FIG. A different signal is output from the optical sensor 3 in response to a change in the amount of incident light on the light receiving element in the optical sensor 3 as compared with the case shown in FIG.
Therefore, in the case shown in FIG. 3, it can be determined from the output signal from the optical sensor 3 that the position of the side guide fence 2 is consistent with the sheet size, particularly the width direction edge, and In the case of FIG. 4, it is possible to determine that the edge of the sheet in the width direction and the side guide fence 2 are not aligned, and thus it is possible to determine that the side guide fence 2 is positioned incorrectly. Further, in the case shown in FIG. 4, it can be judged from the output from the optical sensor 3 that there is no sheet S, so in any case, recheck by the operator can be prompted.

The procedure for detecting the quality of the position setting of the side guide fence 2 as described above is as shown in the flowchart of FIG. That is, the paper S is placed on the paper feed cassette 1, and the output state of the signal from the optical sensor 3 is determined. In this determination, if a signal indicating that there is paper is output, it is determined that the positioning setting of the side guide fence 2 has been normally performed, and for example, the size of the stored paper is displayed. To do.

On the other hand, when a signal indicating that the sheet does not correspond to the side guide fence 2 is output by the signal from the optical sensor 3, the side guide fence 2 corresponds to the edge of the sheet accommodated. I judge that I have not done so,
For example, it is displayed as a set error. In the latter case, the optical sensor 3 can also be used as a paper end sensor for detecting that the paper has run out. In this case, the paper end display is performed instead of the set error display. The operator is warned that the paper cannot be fed from the paper cassette.

Incidentally, as a structure for detecting the above-mentioned correspondence with the paper, instead of the optical sensor 3, as shown in FIG. 6, a limit switch or a filer 4A as an actuator of the photo interrupter 4 is used. Alternatively, the limiter or the photo interrupter 4 may be operated by allowing the filler 4A to protrude from a hole formed in the bottom piece of the side guide fence 2 and pushing it down according to the weight of the paper.

According to the present embodiment, since it is sufficient to provide at least one optical sensor for detecting the correspondence between the side guide fence forming the edge regulating member and the paper, at least for the edge of the paper, it is possible to detect the position. By minimizing the number of means to facilitate the signal processing, the reliability of the operation of the device can be improved and the structure can be simplified.

Next, a structure for detecting the position of the edge regulating member by using the means for detecting the correspondence between the edge regulating member and the sheet will be described.

FIG. 7 is a circuit diagram showing the structure of the position detecting means of the above-mentioned edge-regulating member.
Is an output side terminal for outputting the detection result, reference numeral 6 is a power supply terminal for the position detecting means, and an A / D converter 7 is connected to the output side terminal 5. On the other hand, resistors 8 to 13 are connected in series to the power supply side electric path described above, and switches 14 to 20 are connected in parallel between the resistors.

The switches described above are functionally represented, and are actually composed of contacts. In the case of this structure, the side edge of the paper S accommodated in the paper feed cassette 1 (see FIG. 1) is And a side guide fence 2 (see FIG. 1) and a rear guide fence 21 (see FIG. 1) facing the rear end, respectively.
Function as a conductive part that connects the contacts. Therefore, the positions of the side and rear guide fences correspond to any of the switches, and the contacts are set to the ON state. Reference numeral 14 indicates a constant voltage setting resistor. Now, in this circuit, the relationship between the paper size and the switch that is turned on by being connected by the guide fence when positioned at the edge of the paper is set as shown in Table 1.

[0029]

[Table 1]

Then, in such a circuit, the position of the guide fence is detected by determining the change in the output voltage based on the change in the resistance value until the contact is connected depending on the position of the guide fence. It is like this. That is, for example, when the size of the paper is detected by calculating the position of each edge of the paper vertically placed with the size of A3, the positions of the side guide fence 2 and the rear guide fence 21 are the contact points 16 and 20 is set in the closed position to form a closed circuit such as the equivalent circuit shown in FIG. Therefore, the voltage across the resistor 14, in other words, A
The voltage (Vr1) output to the / D converter 7 is: Vr1 = (R0 / R0 + R1 + ... + R5) .V where R0 to R5 are the resistance values of the resistors 14 and 8 to 13 and V is the power supply voltage. .. Similarly, when A4 portrait paper is accommodated, a closed circuit like the equivalent circuit shown in FIG. 9 is formed. Therefore, the voltage (Vr2) across the resistor 14 can be obtained by Vr2 = (R0 / R0 + R3) .V.

The size of the paper can be detected by detecting the difference in the output voltage depending on the position of the guide fence. In the case of the present embodiment, the above-mentioned output voltages are respectively A /
By inputting to the D converter 7, the data (Ds) corresponding to each voltage is output as a 4-bit data value, for example. The paper size can be calculated from the position detection of the guide fence.

Now, the resistance value R0 of the resistors 8 to 19 and 14
The voltage across the resistor 14 and the output voltage (Ds) from the A / D converter 7 are as shown in Tables 2 to 3 when R5 = 5 and the power supply voltage V = 5 (V). is there.

[0033]

[Table 2]

[0034]

[Table 3]

The detection procedure using the position detecting means having the above-described structure is as shown in the flowchart of FIG. That is, when the paper is stored in the paper feed cassette 1, the size of the paper is detected by detecting the positions of the side guide fence 2 and the rear guide fence 21 set at that time. In this way, the size detection process is performed using the circuit shown in FIG. 7, and is executed based on the output voltage (Ds) corresponding to the position of the switch that is set to the ON state corresponding to the position of the guide fence. To be done. Then, based on the detection result, the correspondence between the guide fence and the paper is determined. This determination is performed using the optical sensor 3 by the structure shown in FIG. 1 by using the optical sensor 3 to determine whether or not a sheet is placed on the sheet placement surface side of the guide fence 2. It is determined that the positioning set is valid and the paper size is displayed. Further, when there is no paper, it is determined that the positioning set of the guide fence is invalid, and as in the case of the embodiment shown in FIG. , Guide error message or paper end message.

According to this structure, it is possible to detect whether or not the positioning set of the edge regulating member of the sheet is effective based on the correspondence between the sheet and the edge regulating member. It is possible to easily obtain the size matching between the position of the edge regulating member and the sheet actually stored.

Next, another configuration for detecting the correspondence between the guide fence and the paper by using the configuration of the position detecting means of the edge regulating member shown in FIG. 7 will be described with reference to FIG.

In FIG. 11, the side guide fence 2 and the rear guide fence 21, which are the edge regulating members for the paper, both function as the position switching members of the switch shown in FIG. In FIG. 12, the contacts shown in FIG. 7 (in FIG. 11,
It is assumed that the power source side contact 14A and the output side contact 14B of the switch 14 shown in FIG.
An oscillating arm 23 having electrical conductivity is supported on the side surface of 2. At the tip end side of the swing arm 23, the actuator 2 made of, for example, conductive rubber is used.
3A is integrated. Further, the swing arm 23 is set such that the actuator 23A is projected into the information from a hole formed in the guide fence by a biasing means (not shown) as a normal posture, and the side guide fence 2 is provided. This state is maintained until the sheet is placed on the rear guide fence 21. In the structure described above, for example, by sliding the side guide fence 2 in the width direction of the paper, the side guide fence 2
Is positioned. When the sheet is placed on the side guide fence 2 set at the position in the width direction of the sheet, the actuator 23A of the swinging arm 23 which is in the normal position due to the weight of the sheet. 21, the actuator 23A side contacts one of the contacts 14A, and the swing end on the side opposite to the actuator 23A side contacts the other contact 1 as shown by the two-dot chain line in FIG.
By flexibly deforming and abutting against 4B, these contacts are connected to each other, and as described in FIG. 7, a closed circuit reaching these contacts is formed.

On the other hand, in spite of the position of the side guide fence 2 being set, the sheet is not placed on the side guide fence 2 and does not correspond to the so-called side guide fence 2. , Swing arm 2
Actuator 23A of No. 3 is kept in its normal position and contact 14 is left open. Therefore, a closed circuit corresponding to the sheet size is not formed, and as a result, it can be determined that the positioning set of the side guide fence 2 is incorrect.

The procedure for detecting the position of the edge regulating member using such a structure is executed in the same manner as in the case shown in FIG. Further, FIG. 13 shows a procedure of the discrimination processing when the paper having the above-mentioned structure is used up, and in this case,
During the copying operation, the presence / absence of paper is determined by determining the connection state of the contact 14 depending on the state of the actuator 23A described above. According to this structure, the relationship between the position setting of the side guide fence, the correspondence between sheets, and the presence / absence of sheets can be determined at the same location, so that a multi-functionality can be obtained with a simple structure.

Further, the above-described position detection of the edge regulating member and the presence / absence of the paper are detected before the paper feed cassette 1 is attached to the main body of the image forming apparatus such as a copying machine which receives the paper. Detecting before the paper position is set, and if the positioning of the edge regulation member does not correspond to the actual paper size, do not allow paper to be fed from that paper feed cassette. Is also possible. FIG. 14 shows
The configuration in the case described above is shown. In this case, for example, the position detection structure of the guide fence described in FIG. 7 is provided in the sheet feeding cassette 1, and the power supply circuit and output signal of the circuit in this position detection structure are provided. The power transmission line and the output transmission line which are provided in the paper feed cassette mounting portion on the apparatus main body side and the connector (in FIG. 14, reference numerals L1 and L
2)), and the output terminal of the A / D converter 7 (see FIG. 7) in each of the electric circuits is operated by the output signal from the A / D converter 7. The solenoid 24 is connected. Solenoid 2 mentioned above
4, an actuator 24A is connected to one of the swing ends of a swing lever 23, and the other swing end of the swing lever 25 is provided with a hinged locking piece 25A. The swing lever 25 has a locking piece 25A provided on the other swing end.
When the paper feeding cassette 1 side is determined to be in a normal position and the paper feeding cassette 1 side determines that the positional relationship between the paper and the guide fence is not compatible. On the basis of a signal output from the A / D converter 7 to the locking piece 25A, the locking piece 25A is made to appear in the mounting path of the sheet feeding cassette 1. In the normal state described above, a spring not shown swings. It is obtained by being hung on the actuator 24A side of the dynamic lever 25.

Therefore, in this structure, the paper feed cassette 1 is loaded at the entrance of the mounting path of the apparatus main body, and the power supply path and the output transmission electric path on the side of the paper feed cassette 1 are connected to those on the apparatus main body side. When it is connected through the circuit, the circuits forming the position detecting structure of the side and rear guide fences 2 and 13 on the side of the sheet feeding cassette 1 are energized,
Position detection processing is executed. Then, the result of this detection processing is output to the solenoid 24 on the apparatus main body side, and when the correspondence between the paper size and the guide fence is not appropriate, as in the case described with reference to FIGS.
4 is excited so that the locking piece 25A of the swing lever 25 is brought out into the mounting path of the sheet feeding cassette 1 and the sheet feeding cassette 1
Disable the installation of.

According to the above-described structure, the paper feeding is performed when the correspondence between the paper edge and the position of the edge regulating member that regulates the position of the edge including the presence or absence of the paper in the paper feeding cassette is not proper. Since the paper cassette cannot be attached, the operator can easily determine that the position setting of the edge regulating member is inappropriate.

[0044]

As described above, according to the present invention, the edge regulating member determines whether the edge of the sheet accommodated in the paper feeding cassette corresponds to the position of the edge regulating member with respect to the edge. It is possible to make a determination by detecting the position of the sheet and the presence / absence of a sheet for the position detection. Therefore, the paper size can be detected by detecting the position of the edge regulating member, and it can be easily confirmed whether this position properly corresponds to the edge of the accommodated paper. It is possible to prevent skew or misalignment of the sheet that occurs when the correspondence with the sheet accommodated in the sheet is not properly set.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing details of an edge regulating member used for the main part shown in FIG.

FIG. 3 is a schematic diagram for explaining the operation of the sheet feeding device shown in FIG.

FIG. 4 is a schematic diagram for explaining another operation of the sheet feeding device shown in FIG.

5 is a flowchart for explaining an operation procedure of main parts of the paper feeding device shown in FIG.

6 is a schematic view showing another example of the position detection structure used in the main part of the paper feeding device shown in FIG.

7 is a circuit diagram for explaining a position detecting structure of an edge regulating member in the paper feeding device shown in FIG.

8 is a circuit diagram for explaining one aspect of the position detection structure shown in FIG.

9 is a circuit diagram for explaining another aspect of the position detection structure shown in FIG.

10 is a flowchart for explaining an operation procedure in the position detection structure shown in FIG.

11 is a schematic diagram for explaining a specific structure of the position detection structure shown in FIG.

12 is a perspective view showing a main part of the embodied structure shown in FIG.

FIG. 13 is a flowchart for explaining a procedure of a paper end operation in the embodied structure shown in FIG.

14 is a schematic diagram showing another structural example using the position detection structure shown in FIG.

FIG. 15 is a schematic diagram showing a conventional example of a paper size detection structure.

16 is a circuit diagram showing an example of a position detection circuit used in the paper size detection structure shown in FIG.

[Explanation of symbols]

1 Paper feed cassette 2 Side guide fence which forms edge regulation member 3 Optical sensor 5 Output terminal 6 Power supply side terminal 7 A / D converter 8, 9, 10, 11, 12, Resistor 14, 15, 16, 17, 18 , 19, 20 Switch 21 Rear guide fence which forms an edge regulating member 22 Terminal plate 23 Swing lever 24 Solenoid 25 Swing lever 25A Locking piece

Claims (9)

[Claims] 1. A paper storage part capable of storing a plurality of papers of different sizes, which is slidably provided at least in the width direction of the stacked papers and is brought into contact with an edge of the papers to thereby end the edges. In the paper feeding device having the edge regulating member for regulating the above, the edge regulating member is provided with a structure for detecting the correspondence of the paper to the position where the edge regulating member is set. Characteristic paper feeding device. 2. The paper feeding device according to claim 1, wherein the structure for detecting the correspondence of the paper in the edge regulating member is
A sheet feeding device provided with a reflection-type optical sensor exposed on the side of a sheet mounting surface of an edge regulating member. 3. The paper feeding device according to claim 2, wherein the reflective optical sensor is adapted to detect the presence / absence of stacked paper. 4. A width direction and a length of a sheet having a sheet storage portion capable of storing a plurality of sheets of different sizes, and sliding the sheet toward an edge of the sheet according to the size and direction of the sheet to be stored. Edge regulating member for regulating the position of the edge with respect to the direction, regulating member position detecting means for detecting whether or not the edge regulating member is in a predetermined position with respect to the upper position, and the width of the sheet. And a sheet size detection unit that detects the size and orientation of the sheet accommodated by the position of the edge regulation member set according to the length, and the sheet size based on the detection result from the edge regulation member. And a means for discriminating whether the detection result of the detection means is true or false. 5. The sheet feeding device according to claim 4, wherein the discriminating means detects that the edge regulating member is located at a predetermined position with respect to the sheet as a result of detection by the regulating member position detecting means. When it is determined that the detection result by the paper size detection means is valid, while the detection result by the regulation member position detection means detects that the edge regulation member is not located at a predetermined position with respect to the paper. The paper feeding device is adapted to invalidate the detection result by the paper size detecting means when the above condition is met. 6. A sheet feeding device capable of accommodating a plurality of sheets of different sizes, which is slidable in a direction in which it abuts an edge of the sheet according to the size and orientation of the sheet accommodated, and the edge of the sheet. An edge regulation member that regulates the position of the edge, and the edge regulation member when the edge regulation member is at a predetermined position with respect to the sheet and the sheet is present facing the edge regulation member. A sheet feeding device comprising: a sheet size determination unit that outputs a signal according to the position of a member. 7. The paper feeding device according to claim 6, wherein the paper size determination means detects the paper size when the paper is accommodated to enable detection of the paper size, and when the paper is not accommodated, the paper size is determined. A paper feeder designed to make size detection impossible. 8. A sheet feeding device capable of accommodating a plurality of sheets of different sizes and provided with a sheet cassette that can be inserted into and removed from a device that requires the sheet, depending on the sheet size to be accommodated. Edge regulation member that is slidable in a direction that changes the position and that regulates the position and orientation of the edge that corresponds to the size of the paper, and the width and length edges of the paper size The regulation member position detecting means for detecting whether or not the edge regulation member is located at a predetermined position with respect to each edge of the sheet, and the sheet presence / absence detecting means for detecting the presence / absence of the sheet. The position detecting means is configured to detect the position of the edge regulating member before the sheet cassette is completely attached to the apparatus main body and the sheet feeding state is set. Paper feeder. 9. The paper feeding device according to claim 8, wherein the paper feeding cassette mounting portion on the device side that requires paper is
A sheet feeding device provided with a switching unit for switching between a state in which the sheet cassette can be mounted and a state in which the sheet cassette cannot be mounted according to the detection results of the regulation member position detection unit and the sheet presence / absence detection unit.