JP2000053276A - Paper feeder with paper detection function - Google Patents

Abstract

(57) [Problem] To provide a paper feeder with a paper detection function capable of detecting the presence or absence of paper, the width of paper, and the like while sharing a paper holding member. A recording paper transport unit provided in a multi-function device includes a plurality of paper pressing members disposed in a longitudinal direction with respect to a paper feed roller extending in a longitudinal direction, and a recording paper transport unit. Press K1. The sheet detection unit 25 that detects the recording sheet K1 has an operation piece 32 that is moved by the conveyed recording sheet K1 and returns when the recording sheet K1 is not conveyed.
The third opening 29 can receive the upper end 32a of the operating piece 32 that returns when the recording sheet K1 is not conveyed. Thereby, based on the movement and return of the operating piece 32, the light emitting and light receiving element pair 33 of the paper detecting unit 25
The presence or absence of the recording paper K1 can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder having a paper detection function capable of detecting the presence or absence of a paper or the width of the paper while using a paper feed roller extending in a longitudinal direction, and more particularly to a facsimile function. The present invention relates to a paper feeder with a paper detection function provided in a multi-function device or the like having a function.

[0002]

2. Description of the Related Art If a facsimile apparatus only satisfies a basic receiving function, it is sufficient to provide only one type of recording paper of, for example, A4 size, and it is necessary to detect a paper width and the like. There is no. However, recent facsimile apparatuses can execute various functions such as a printer function in addition to a transmission / reception function, and are becoming multi-function devices capable of performing each function with one apparatus. In this device, for example, a printer function for recording B5 size data transmitted from a computer can be selected in a state where B5 size recording paper is mounted. Therefore, it is necessary to detect a paper width or the like and select an appropriate paper. is there. Therefore, the device employs a paper feed device with a paper detection function, and the device includes a paper feed roller extending in a longitudinal direction and a paper pressing member opposed to the paper feed roller, and feeds the paper. Paper detection means,
The presence or absence of the sheet, the sheet width, and the like can be detected.

[0003]

When the sheet feeder with the sheet detecting function has only one sheet pressing member, it is difficult to evenly press the sheet against the sheet feed roller, and the skew of the sheet at the time of sheet conveyance is caused. And so on. Therefore, it is desirable to arrange a plurality of sheet pressing members in the longitudinal direction of the sheet feed roller and press the sheets evenly. However, when the paper detecting means detects the paper width, for example, the detection position is inevitably determined by the paper width. Therefore, since the detection position and the paper pressing position overlap, the paper pressing member is shared. Hateful. Therefore, it is necessary to prepare two or three types of paper holding members having different shapes,
This was the cause of cost increase. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described conventional problems, and has a sheet feeder with a sheet detection function capable of detecting the presence or absence of a sheet or a sheet width while sharing a sheet pressing member. The purpose is to provide.

[0004]

According to the first aspect of the present invention, a sheet is fed using a sheet feed roller extending in a longitudinal direction. And a sheet detection device having an operation piece moved by the conveyed sheet so as to detect the presence or absence of the sheet, the sheet width, and the like in a sheet feeder with a sheet detection function capable of detecting the presence or absence of the sheet or the sheet width. And a receiving portion for receiving an operation piece that returns when the paper is not conveyed, and a paper pressing member including a paper pressing portion that presses against the paper feed roller via the paper is provided. It is characterized in that a plurality are arranged in the longitudinal direction.

According to such a paper feeder with a paper detection function, the paper presser of the paper presser can feed the paper by pressing the paper against the paper feed roller. Since a plurality of rollers are disposed in the longitudinal direction of the rollers and press the paper as evenly as possible, skew during paper conveyance can be prevented. Also,
The sheet detecting means has an operation piece that moves by the conveyed sheet and returns when the sheet is not conveyed, and the receiving portion of the sheet pressing member can receive an operation piece that returns when the sheet is not conveyed. Therefore, based on the movement and return of the operating piece, the sheet detecting means can detect the presence or absence of the sheet, the sheet width, and the like.

According to a second aspect of the present invention, in the paper feeder with the paper detecting function according to the first aspect, the paper is uniformly pressed against the paper feed roller. Further, a plurality of the paper pressing members are arranged in the longitudinal direction of the paper feed roller. As described above, the paper pressing members arranged in a plurality in the longitudinal direction uniformly press the paper against the paper feed roller, so that the skew during the paper conveyance can be reliably prevented.

According to a third aspect of the present invention, in the sheet feeder with the sheet detecting function according to the first or second aspect, the sheet pressing member is provided for detecting the presence or absence of a sheet. And a sheet width detection receiving portion for receiving the sheet width detecting operation piece for receiving the operation piece. As a result, the sheet presence / absence detection receiving portion receives the operation piece for detecting the presence of the sheet, and the sheet width detection receiving portion can receive the operation piece for detecting the sheet width. Since the receiving section for detecting the presence or absence of the sheet and the receiving section for detecting the sheet width are provided, even if sheets having different sheet widths are used, the sheet holding member can be shared, and the cost of parts can be reduced. In addition, the use of a common paper pressing member reduces the mounting work and reduces the assembly cost of the apparatus.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a paper feeder with a paper detection function according to the present invention will be described below in detail with reference to the drawings. First, a schematic configuration of a multi-function device 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the device 1, and FIG. 2 is a longitudinal sectional view showing a main part of the device 1. The multi-function device 1 has, for example, a facsimile transmission / reception function, a read-only function, a telephone function, a copy function, a printer function, and other functions, as well as other functions. .

In FIG. 1, a multifunctional device 1 has a telephone handset 2 on the side of the device, and can be used as a telephone. An operation panel 3 on which various buttons are arranged is arranged on the upper front side of the multi-function device 1. Further, an original placing portion 4 for setting an original SH for reading (see FIG. 2) is disposed at an upper central portion,
A document S that has passed through the inside of the apparatus 1
A discharge tray 5 for receiving H is provided. Further, on the rear side of the upper surface of the multi-function device 1, a recording sheet K1 (see FIG. 2)
A cassette insertion portion 6 is provided for inserting and inserting a paper cassette K2 that stores the paper sheets in a stacked state, and a paper discharge receiving the recording paper K1 that has passed through the inside of the device 1 is provided at a lower front side of the device 1. A tray 7 is provided. On the operation panel 3, a liquid crystal (LCD) display 8 is arranged on the upper side. The liquid crystal display 8 displays various messages, for example, a telephone number when the facsimile function is executed, and also performs a copy operation. , An operation command message at the time of executing a reading operation, a printer operation, and the like, and other messages as necessary.

On the lower side of the liquid crystal display 8, numeric buttons 9 of "0" to "9" are arranged. These numeric buttons 9 are used to input or copy a telephone number at the time of facsimile function. A button for inputting the number of copies and the like in executing the function. Further, on the lower right side in the operation panel 3, an execution button 10 and the like are arranged, and this execution button 10 is depressed at the time of starting the copy function execution or at the time of starting the recording operation.

An internal passage of the multi-function device 1 shown in FIG. 2, that is, a guide passage 11 below the operation panel 3 is provided, along which the original SH is placed. From the downstream side. More specifically, below the operation panel 3, a document separation roller 12 and a separation piece 13 that is in contact with the roller 12 are provided along the guide path 11. A pair of upper and lower guide rollers 14 is disposed on the downstream side in the direction. A pair of upper and lower guide rollers 15 is disposed downstream of the guide rollers 14 in the transport direction, and an image reading unit 17 is provided between the guide rollers 14 and 15.
Is provided.

The original S stacked on the original placing section 4
H is separated one by one by a document separating roller 12 and a separating piece 13 and is conveyed downstream while applying tension by guide rollers 14 and 15. And guide roller 1
After the image is read by the image reading unit 17 at the reading position 16 set between 5, the image is discharged onto the paper discharge tray 5.

The image reading section 17 is provided at the reading position 16.
Horizontally long contact type image sensor 1 arranged below
8 and a pressing plate 19 facing the close contact type image sensor 18. Since the contact image sensor 18 includes a photoelectric conversion element and has a function of transferring accumulated electric charges, reflection from an image on a document interposed between the contact image sensor 18 and the pressing plate 19 is performed. Light is accumulated as electric charges, and the transferred electric charges are processed as image data.

An image reading unit 17 inside the multi-function device 1
A printer unit 20 is disposed behind the printer unit. The printer unit 20 conveys the recording sheet K1 with an ink jet printer unit IG that records image data on recording sheets K1 conveyed from a sheet cassette K2. And a recording paper transport unit 21. The ink jet printer unit IG is of a so-called serial print type that reciprocates in a direction orthogonal to the transport direction of the recording paper K1, and a nozzle unit (see FIG. 1) that individually discharges ink of each color of cyan, magenta, yellow, and black. (Not shown), and the image data can be recorded on the recording paper K1 in a serial manner.

The recording paper transport section 21 includes a paper feed roller 22, a paper pressing member 23 disposed opposite the paper feed roller 22, and a pair of guide rollers 24 located downstream of the paper feed roller 22 and the like. In addition, a paper detection unit 25 (paper detection unit) is provided upstream of the paper feed roller 22 and the paper pressing member 23. Thereby, the recording sheet K1 fed from the sheet cassette K2
Is transported along the transport path 26 while the paper detecting unit 2
5 and the leading ends thereof are aligned by the sheet feed roller 22 and the sheet pressing member 23, and then the sheet feed roller 22 and the sheet pressing member 23
The sheet feed roller 22 and the sheet pressing member 23 and the guide roller 2
4, a recording operation is performed at the recording position 27 set between the recording positions. That is, the inkjet printer unit IG moves the recording paper K1 while reciprocating in the left-right direction of the multi-function device 1.
One line of image data is recorded thereon, and when the recording of one line of image data is completed, the recording paper transport unit 2
1 is the next one line, the recording paper K1 is conveyed in the downstream direction, and the image data of that one line is recorded again. Thereafter, after clear image data is recorded on the recording paper K1, the recording paper K1 is conveyed toward the discharge tray 7 shown in FIG.

Therefore, when the execution button 10 is pressed to execute a copy operation, the image data read through the image reading unit 17 is inserted into the cassette through the ink jet printer unit IG as a recording unit. The recording paper K1 is recorded on a recording paper K1 fed from a paper cassette K2 inserted in the unit 6, and the recording paper K1 is discharged onto a discharge tray 7. When the execution button 10 is pressed to execute the recording operation, the recording data transmitted from the computer or the like is recorded on the recording paper K1 fed from the paper cassette K2 via the inkjet printer unit IG. Recorded,
The recording paper K1 is discharged onto the discharge tray 7. And
When recording is performed as a printer, for example, A4,
Since it is desirable to be able to use recording papers K1 of different sizes such as B5 size, the recording papers K1 of different sizes such as A4 and B5 sizes are loaded into the paper cassette K2 inserted into the cassette insertion portion 6. I can do it.

Hereinafter, the sheet feed roller 22, the sheet pressing member 23 and the sheet detecting section 25 thereof will be described in detail. FIG.
FIG. 3 is an enlarged side view schematically showing the positional relationship between the paper feed roller 22, the paper pressing member 23, the paper detection unit 25, and the like. FIG. 4 is a plan view showing one of the sheet pressing members 23 in an enlarged manner. FIG. 5 is an enlarged plan view schematically showing the positional relationship between the sheet pressing member 23 and the sheet feed roller 22. As shown in FIG. 5, the paper feed roller 22 extends in the longitudinal direction (the width direction of the recording paper K1), and is supported by a roller shaft 22a and rotates. The five sheet pressing members 23 are arranged side by side in the longitudinal direction of the sheet feed roller 22. However, in order to press the recording sheet K1 against the sheet feed roller 22 as uniformly as possible, the center of the recording sheet K1 is required. It is arranged so as to be symmetrical with respect to a line K1a (indicated by a dashed line).

As shown in FIG. 4, the paper pressing member 23 is provided with a paper feed roller 22 via a recording paper K1.
Roller 28 (FIG. 3)
(See FIG. 3), an opening 29 (receiving portion) for receiving the upper end portion 32a (see FIG. 3) of the operating piece 32 of the paper detecting section 25, and a paper holding member 23 for rotating support. And a hook portion 31 for a vine winding spring 35 (see FIG. 3) for urging the small-diameter roller 28 toward the paper feed roller 22. The opening 2
9 includes an opening 29a for detecting the presence or absence of a sheet, an opening 29b for detecting the width of a sheet, and an opening 29c for detecting the trailing edge of the sheet. Opening 29b
Is located on the side of the opening 29a.

As shown in FIG. 3, the paper pressing member 23 is attached to a frame F1 which extends vertically in the multifunction device 1. Specifically, the frame F1 is provided with a downwardly projecting portion F1a, and the downwardly projecting portion F1a is formed by a concave portion 30a of the rotation center portion 30 (see FIG. 4).
Can fit inside. Therefore, the downward projecting portion F1
a of the pin 30b of the rotation center portion 30 in the fitting hole F1b of FIG.
By pivotally fitting (see FIG. 4), the paper pressing member 23 can rotate about the pin 30b of the rotation center 30. Further, a side protruding portion F1c is provided above the frame F1, and the side protruding portion F1c is provided.
c and the hook portion 31 of the paper holding member 23 pulls the hook portion 31 to urge the small-diameter roller 28 of the paper holding member 23 in the direction of arrow B to feed the paper feed roller 22. Can be pressed. By arranging a plurality of small-diameter rollers 28 (paper pressing portions) in the longitudinal direction of the paper feed roller 22 in this manner, the leading end of the recording paper K1
And the small-diameter roller 28 of the sheet pressing member 23.

As shown in FIG. 3, the sheet detecting section 25 includes an operating piece 32 for detecting the presence or absence of the recording sheet K1 (or recording sheet width) and the like, and a substrate D of the multi-function device 1.
1 and a light-emitting and light-receiving element pair 33 disposed thereon. The operating piece 32 extends upward from the substrate D1 and is rotatably supported around a rotation center 34. The operating piece 32 is rotated in the direction of arrow A in FIG. 3 by the transported recording paper K1. At the same time, when the recording sheet K1 is not conveyed, it rotates in the direction opposite to the arrow A direction.
That is, when the recording sheet K1 does not exist, the upper end portion 32a of the operation piece 32 fits into the opening 29 (29a) so as to block the conveyance of the recording sheet K1 to the downstream side. Is the upper end 32a of the operating piece 32
When the leading end of the recording sheet K1 urges the upper leading end 32a, the upper leading end 32a of the operating piece 32 falls down in the direction of arrow A, and the lower leading end 32b of the operating piece 32 moves to the substrate D1. The above light emitting and light receiving element pair 33
, And does not block the detection light between the light emitting and light receiving element pair 33.

Thereafter, the rear end of the recording paper K1 is
2 passes through the position of the upper tip 32a of the
Since the upper end portion 32a is not urged by the recording sheet K1, the upper end portion 32a rotates (returns) in the direction opposite to the arrow A direction due to the weight of the operation piece 32. Then, the lower end portion 32b of the operation piece 32 moves to the detection position of the light emitting and light receiving element pair 33 on the substrate D1, and the lower end portion 32b exists between the light emitting and light receiving element pair 33. Become. As described above, based on the rotational movement and return of the upper end portion 32a and the lower end portion 32b of the operating piece 32, the light emitting and light receiving element pair 33 detects or does not detect the lower end portion 32b. The presence or absence of K1 (or the width of the recording paper K1) can be detected. Therefore, these operating pieces 3
2. The opening 29 and the light-emitting and light-receiving element pair 33 constitute a sheet detection unit 25 for detecting the presence or absence of a sheet.

In FIG. 3, the operating piece 32 and the opening 2 for receiving the operating piece 32 are shown for easy viewing.
Although only the opening 29a for detecting the presence or absence of the sheet is described as 9, an operating piece 32 that is fitted into the opening 29b for detecting the sheet width and the opening 29c for detecting the trailing edge of the sheet is actually provided. That is, the opening 29c (painted black) for detecting the trailing edge of the paper and the opening 29a (painted black) for detecting the presence or absence of the paper of the middle paper pressing member 23 of the five paper pressing members 23 shown in FIG. An operation piece 32 for detecting the trailing edge of the sheet and an operation piece 32 for detecting the presence / absence of the sheet are provided so as to fit into the sheet, and an opening 29b for detecting the sheet width of the rightmost sheet pressing member 23 (painted black). An operation piece 32 for detecting a sheet width is provided so as to fit into the sheet. Thus, the detection unit 25 for detecting the trailing edge of the sheet and the detection unit 25 for detecting the sheet width are provided in the same manner as the sheet detection unit 25 for detecting the presence or absence of the sheet.

The position of the opening 29a for detecting the presence or absence of the sheet and the opening 29c for detecting the trailing edge of the sheet may be A4 or B
When the center of any one of the five sizes of the recording paper K1 passes through the center line K1a, the upper end 32a of the operating piece 32 is moved by the recording paper K1 of any size. Further, the position of the opening 29b for detecting the sheet width is such that the center of any size of the A4 or B5 size recording sheet K1 passes through the center line K1a.
The upper end 32a of the operation piece 32 is moved by the recording paper K1 of the size 4 while the upper end 32a of the operation piece 32 is moved by the recording paper K1 of the B5 size.
Cannot be moved.

Therefore, when the center of the A4 size recording sheet K1 passes through the center line K1a, the rightmost sheet pressing member 23 of the five sheet pressing members 23 in FIG.
The operating piece 32 fits only into the opening 29b for detecting the sheet width of the sheet, and the opening 2 for detecting the presence or absence of the sheet of the middle sheet pressing member 23 of the five sheet pressing members 23.
An operating piece 32 (not shown) fits in the opening 9c and the opening 29c for detecting the trailing edge of the sheet. Then, the opening 29a for detecting the presence or absence of the sheet, the opening 29b for detecting the sheet width, and the opening 29 for detecting the trailing edge of the sheet other than those described above.
c does not have a corresponding operating piece 32,
The upper end 32a of the operation piece 32 does not fit into the opening 29. Therefore, the opening 29 in which the operating piece 32 does not fit does not play any role, and may not be actually provided. However, all five paper pressing members 23 have these openings 29a, 29b, 29
When c is formed, the sheet pressing member 23 can be shared, the component cost can be reduced, and the mounting operation can be reduced by using the shared sheet pressing member 23.

As described above, since the opening 29a for detecting the presence or absence of the sheet and the opening 29c for detecting the trailing edge of the sheet are located at the center in the width direction of the recording sheet K1, the transport path 26 is provided.
For example, the recording paper K1 conveyed along the direction can detect the B5 size recording paper K1 smaller than the A4 size, whereas the paper width detecting opening 29b is slightly outside the B5 size width. Since it is located slightly inside the width of the A4 size, for the A4 size or a letter size larger than the A4 size, the paper detection unit 25
Can be detected, but, for example, B5 size smaller than A4 size cannot be detected.

Accordingly, the sheet detecting section 25 for detecting the sheet width detects the recording sheet K1, and the sheet detecting section 25 for detecting the presence or absence of the sheet and detecting the trailing end of the sheet detects the recording sheet K1. It can be determined that the recording paper K1 of the size is being conveyed. In the transport state of the A4 size recording paper K1, if the paper detection unit 25 for detecting the trailing edge of the paper continues to detect the recording paper K1 even after a certain period of time has elapsed after the presence of the recording paper K1, the recording paper K1 Is the transport path 26
Since it is supported somewhere in the interior, a recording paper feed error can be determined.

Further, the sheet detecting section 25 for detecting the presence or absence of the sheet and the trailing edge of the sheet detects the recording sheet K1, and
When the paper detection unit 25 for detecting the paper width does not detect the recording paper K1, for example, it can be determined that the recording paper K1 of B5 size is being conveyed. Then, in the conveyance state of the B5 size recording paper, after a certain period of time has elapsed after the detection of the presence of the recording paper K1, the paper detection unit 25 for detecting the trailing edge of the paper is used.
In the case where the presence of the recording paper K1 is continuously detected,
6, the recording paper feed error can be determined. As described above, the paper detection unit 25 for detecting the presence or absence of the paper and for detecting the trailing edge of the paper has the A4 size
Since it also plays a role of detecting the recording paper K1 of the same size, the number of detectors for detecting the recording paper K1 is reduced, the mounting work is reduced, and the component cost of the multi-function device 1 is reduced.

As described in detail above, according to the multi-function device 1 of this embodiment, it is possible to feed a sheet using the sheet feed roller 22 extending in the longitudinal direction and detect the presence or absence of the sheet or the sheet width. A recording sheet transport unit 21 is provided, and the recording sheet transport unit 21 has an operation piece 32 that is moved by the transported recording sheet K1 so as to detect the presence or absence of the recording sheet K1 or the sheet width. 25, and an opening 29 for receiving an operating piece 32 that returns when the recording sheet K1 is not conveyed.
A sheet pressing member 2 having a small-diameter roller 28 for pressing the sheet feeding roller 22 via a recording sheet K1
3 and a plurality of the paper pressing members 23 are provided in the longitudinal direction of the paper feed roller 22, so that the paper pressing member 23 can be used in common, and the presence or absence of the paper or the paper width can be detected.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and modifications can be made without departing from the spirit of the present invention. For example,
In a printer unit according to another embodiment, recording may be performed by a recording unit of a so-called line printing type system or the like. Further, the above-described paper feeder with a paper detection function may be provided on the side of the original to be read. Further, the above-described paper feeder with a paper detection function may be employed in a facsimile device, a reading device, a copying device, a printer device, etc. other than the multifunctional device 1. In the case of a product that does not need to detect the trailing edge of the paper with respect to the opening 29, the aperture for detecting the trailing edge of the paper may be omitted, or any of the presence or absence of the paper or the width of the paper may be used. One of them may be detected. The receiving portion for receiving the operation piece 32 may be, for example, a concave portion, or the shape of the operation piece 32 may be changed. Further, the number of the paper pressing members 23 is not necessarily limited to five.

[Brief description of the drawings]

FIG. 1 is a perspective view of a multifunctional device according to an embodiment of the present invention.

FIG. 2 is an enlarged side view schematically showing the multi-function device.

FIG. 3 is an enlarged side view schematically showing a positional relationship among a paper pressing member, a paper feed roller, a paper detection unit, and the like.

FIG. 4 is an enlarged plan view showing one of the sheet pressing members.

FIG. 5 is an enlarged plan view schematically showing a positional relationship between the sheet pressing member and a sheet feed roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multifunctional device 3 Operation panel 4 Document placement part 6 Liquid crystal display IG inkjet printer part 17 Image reading part 20 Printer part 21 Recording paper transport part 22 Paper feed roller 23 Paper holding member 25 Paper detection part 28 Small diameter roller 29 Opening 29a Paper Opening for detecting presence / absence 29b Opening for detecting paper width 29c Opening for detecting trailing edge of paper 30 Center of rotation 32 Working piece 33 Light emitting and light receiving element pair SH Original K1 Recording paper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI theme coat テ ー マ (reference) H04N 1/00 108 H04N 1/00 108H 5C062 F term (reference) 2C058 AB16 AB23 AD03 AE02 AF15 GB05 GB12 GB17 GB29 GB47 2C059 AA00 AA26 AA56 AA74 DD00 2C060 BC32 BC96 3F048 AA04 AB01 BA05 BA07 BA20 CA03 CC01 DC12 3F049 AA02 DA14 LA05 LB01 5C062 AB32 AC67 AC68 AD01 AD06 BA01 BA02

Claims (3)

[Claims] 1. A sheet feeder with a sheet detection function capable of feeding a sheet using a sheet feed roller extending in a longitudinal direction and detecting the presence or absence of the sheet or the sheet width, etc., wherein the presence or absence of the sheet or the sheet width is detected. Sheet detecting means having an operation piece moved by the conveyed sheet, and a receiving portion for receiving an operation piece that returns when the sheet is not conveyed, and presses the sheet feed roller via the sheet. A sheet feeder with a sheet detecting function, comprising: a sheet pressing member provided with a sheet pressing section to be provided; and a plurality of the sheet pressing members arranged in the longitudinal direction. 2. The paper feeder with a paper detection function according to claim 1, wherein a plurality of the paper press members are arranged in a longitudinal direction of the paper feed roller so as to press the paper uniformly against the paper feed roller. A sheet feeder with a sheet detection function. 3. The sheet feeder with a sheet detection function according to claim 1, wherein the sheet pressing member includes a sheet presence / absence detection receiving portion for receiving an operation piece for sheet presence / absence detection, and a sheet width. A sheet feeder with a sheet detection function, comprising: a sheet width detection receiving portion for receiving an operation piece for detection.