JPH07309481A - Paper sheet skew correcting device in paper feeder - Google Patents

Abstract

PURPOSE:To correct a skew to various paper sheets by correcting the skew by bringing a paper sheet into contact with an inserter roller when a thickness or the like of the paper sheet is small, and correcting the skew by bringing the paper sheet into contact with a shutter when the thickness or the like is large. CONSTITUTION:When a paper sheet is thin, first of all, the paper sheet is stopped in a condition of being connected to a pick roller. In this condition, an inserter roller (roller) 7 composed of a driving roller 21 and a driven roller 23 is put in a stopping or inversely rotating condition. Next, the paper sheet is brought into contact with the roller 7 by the pick roller, and a skew condition of the paper sheet is corrected. Next, the roller 7 is forward rotated, the paper sheet is carried. When the paper sheet is thick, a pick sensor detects the paper sheet in the middle of being carried, and makes a paper sheet contact piece 34 of a shutter 17 stand by in front of the roller 7. Next, the paper sheet is brought into contact with the paper sheet contact piece 34, and a skew condition of the paper sheet is corrected. The paper sheet contact piece 34 is retreated, and the paper sheet is inserted in the roller 7, and is carried.

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 such as an OCR device or a printing device for feeding a sheet.
The paper is configured to prevent the paper from being set obliquely on the reading mechanism or the printing mechanism, correct the paper to be set in a normal state, and perform the optimum correction for the paper to be fed. The present invention relates to a paper skew correction device in a paper device.

[0002]

2. Description of the Related Art Conventionally, for example, an OCR device has been known as a device for reading information recorded on a form or recording paper in order to process the information. As such an OCR device, generally, a hopper mechanism for moving a plurality of sheets stacked on a hopper to a predetermined preparation position, a pick mechanism for picking up one sheet placed at the preparation position, and a sheet conveyance device. A feed mechanism, a reading mechanism for reading information on the conveyed paper, and a discharge mechanism for discharging the read paper to the stacker. In recent years, these mechanisms have generally been controlled by a microprocessor.

FIG. 10 is a structural explanatory view schematically showing an example of a conventional OCR device. In FIG. 10, reference numeral 1 denotes a hopper, which is configured to stack a plurality of sheets 2 and to be able to move up and down to a preparation position. Numerals 3 and 4 respectively denote a pick roller and a separation roller, which are rotatably provided on the connecting arm 5 and constitute a pick mechanism. A separation pad 6 is in sliding contact with the separation roller 4. Reference numeral 7 is an inserter roller, and 8 and 9 are discharge rollers, which constitute a paper feed mechanism and a paper discharge mechanism.

Next, 10 is a light source, 11 is a reflection mirror, and 12
Is a CCD, and the reading mechanism constituted by these is provided so that the reading unit 13 faces between the inserter roller 7 and the discharge roller. Reference numeral 14 denotes a stacker, which stores the paper 2 after reading.

With the above configuration, when reading the information on the paper 2, the hopper 1 on which the paper 2 is loaded is first raised to stop the hopper 1 with the upper end of the paper 2 in contact with the pick roller 3. . Next, when the pick roller 3 and the separation roller 4 are each rotated in the clockwise direction, one sheet of paper 2 is taken in and conveyed to the left. In this case, pick roller 3
When a plurality of sheets of paper 2 are taken in by the contact pad 1 that is in contact with the surface of the separation roller 4 by the separation pad 6.
Only the sheets are transported. The sheet 2 is conveyed by the inserter roller 7 below the reading unit 13 that constitutes the reading mechanism,
The reflected light of the light source 10 passes through the reflection mirror 11 and the CCD 1
2 and the information on the paper 2 is read. The read paper 2 is stored on the stacker 14 via the discharge rollers 8 and 9.

When the sheet 2 is fed to the inserter roller 7, if the leading edge of the sheet 2 is not parallel to the axis of the inserter roller 7 (this state is called skew), the printed result is very unsightly. Not only that, but in extreme cases, it may be recognized as false information.
Therefore, it is necessary to correct skew or skew before the sheet 2 is taken into the inserter roller 7.

11 to 13 are explanatory views showing a sheet conveying state in the conventional example, and FIG. 14 is a plan view of a main part for explaining a skew correction state, and the same portions are the same as those in FIG. Indicate. First, as shown in FIG. 11, the hopper 1
Is raised in the direction of the arrow to stop the paper 2 in contact with the pick roller 3. Next, as shown in FIG.
When each of the pick roller 3 and the separation roller 4 is rotated clockwise, the uppermost sheet 2 is taken into the pick mechanism and conveyed to the left. Paper 2 is transported further to the left,
The leading edge 2a of the sheet 2 is abutted against the inserter roller 7. However, at this point of time, the inserter roller 7 is in a stopped state or a reverse rotation state in which the sheet 2 is fed backward to the right.

Next, skew feeding overfeed is performed from the above state. That is, the sheet 2 is conveyed further leftward by the pick roller 3 and the separation roller 4 to correct the skew of the sheet 2. That is, as shown in FIG. 14, the skewed sheet 2 is excessively fed to the inserter roller 7 in the stopped state or the reverse rotation state. As a result, the sheet 2 rotates in the direction of the arrow a, and the skewed state is corrected, The leading edge 2a of the sheet 2 is parallel to the axis of the inserter roller 7.

After the skew feeding correction, as shown in FIG. 13, the inserter roller 7 rotates in the forward direction and the sheet 2 is bitten, and then the hopper 1 is lowered to overlap the pick rollers 3. Preventing the next paper 2 from being taken in.

[0010]

In the above-described conventional skew feeding correction device, the inserter roller 7 is in the stopped state or the reverse rotation state when skew feeding of the sheet 2 is corrected. Therefore, in order to convey the sheet 2 from this state, the inserter roller 7 needs to be in the normal rotation state.
There is a loss time for starting the motor that drives the. In particular, in order to shift the inserter roller 7 from the reverse rotation state to the normal rotation state, the sequence of reverse rotation → stop → forward rotation is performed, resulting in a large loss time. Therefore, there is a problem in that the sheet 2 cannot be conveyed at high speed.

On the other hand, for this type of paper feeding device in recent years,
Higher processing speeds have been demanded, and high performance and high speed conveyance are also required for the sheet skew correction device. Therefore, the conventional configuration can meet these requirements. There is a problem that you cannot do it.

In order to solve the above-mentioned problems, the applicant of the present invention has proposed that a shutter provided with a sheet contacting piece for contacting the sheet 2 in the vicinity of the inserter roller 7 constituting the sheet conveying mechanism,
A paper skew correction device configured to selectively face the paper transport path has been proposed (Japanese Patent Application No. 5-184845).
issue).

According to the above-mentioned proposal, the sheet contact piece faces the upstream side of the inserter roller in the sheet conveying direction only when the sheet skew correction is performed, and the sheet contact piece retracts when the sheet is conveyed. It is possible to keep the sheet in the normal rotation state at all times, and it is possible to surely perform the skew feeding correction of the sheet and to obtain the effect that the sheet can be conveyed at high speed.

However, as a result of the subsequent examination, it was found that some problems still remain in the above improvement proposal. That is, in the improvement proposal, since the time required for skew feeding of the paper is short, there is an advantage that the processing speed of the reading device as a whole is improved, but the continuous amount of paper is low, that is, thin paper or small size paper. If it is a sheet, there is a problem that the sheet may be damaged due to the contact of the sheet with the sheet contact piece.

On the other hand, in the sheet skew correcting means using the inserter roller 7 shown in FIGS. 11 to 13, there is a loss time until the inserter roller 7 is stopped, reversely rotated, and then forwardly rotated as described above. Although it impedes high-speed conveyance, it has the advantage that it can perform skew correction over a wide range from thin paper to thick paper, and it does not damage the paper.

In recent years, there are various types of sheets for recording information. Therefore, if the skew feeding correction device is simply limited to any one type, it cannot support various types of sheets. Therefore, there is a demand for a printer that is more adaptable and that can perform optimal skew feeding correction for a fed sheet.

The present invention solves the above-mentioned problems existing in the prior art and some problems in the improved invention, and makes it possible to optimally perform skew correction on a variety of sheets, and to correct the skew of a sheet feeding device. An object is to provide a line correction device.

[0018]

In order to achieve the above object, in the first invention, a sheet conveying mechanism for automatically conveying a plurality of sheets stacked on a hopper, and a conveyed sheet are provided. And a processing mechanism for processing, wherein the paper transporting mechanism takes in at least the hopper mechanism that moves the paper stacked on the hopper to a predetermined preparation position, and one sheet placed at this preparation position. In a paper skew correcting device in a paper feeding device including an automatic paper feeding mechanism having a pick mechanism and a feed mechanism for conveying paper,
The inserter roller pair that constitutes the paper transport mechanism is formed to be rotatable in the forward and reverse directions, and the paper contact piece selectively faces the paper transport path at a position upstream of the nip portion of the inserter roller pair in the paper transport direction. A shutter formed on the sheet conveying path, and in response to a signal from a means for detecting the continuous amount and size of the sheet provided facing the sheet conveying path, skew correction of the sheet by reverse rotation of the inserter roller pair and the sheet of the shutter. The technical means of adopting one of the paper skew correction by the contact of the contact pieces is adopted.

Next, in the second aspect of the present invention, a sheet conveying mechanism for automatically conveying a plurality of sheets stacked on the hopper and a processing mechanism for processing the conveyed sheets are provided. The transport mechanism includes at least a hopper mechanism that moves the sheets stacked on the hopper to a predetermined preparation position, a pick mechanism that takes in one sheet placed at the preparation position, and a feed mechanism that conveys the paper. In a sheet skew feeding correction device in a sheet feeding device having an automatic sheet feeding mechanism, a pair of inserter rollers forming a sheet feeding mechanism is formed to be rotatable in forward and backward directions, and a sheet feeding direction is set from a nip portion of the pair of inserter rollers. A shutter is formed so that the sheet contacting piece selectively faces the sheet conveying path at a position on the upstream side of the sheet, and a signal regarding the continuous amount and size of the sheet is input. A force means is provided, and based on a signal from the input means, one of the skewed sheet correction by the reverse rotation of the inserter roller pair and the skewed sheet correction by the contact of the sheet contact piece of the shutter is selected. To configure,
I adopted the technical means.

In the above invention, an arm having a turning radius larger than the diameter of the rollers of the inserter roller pair is rotatably provided, and a paper contact piece is provided at the free end of the arm to form a shutter. You can

In the above invention, the hollow tube body loosely rotatably fitted on the drive roller shaft of the inserter roller pair has a sheet contact piece having a radial length larger than the radius of the drive roller. A stopper formed integrally with a locking piece having a radial length smaller than the radius of the drive roller to form a shutter, and a stopper formed to be selectively engageable with and disengageable from the paper contact piece and the locking piece. It can be provided so as to be movable in the direction along the drive roller axis.

[0022]

With the above construction, when the continuous amount and / or the size of the sheet is large, the skew feeding correction by the shutter is selected and the sheet is conveyed at a high speed. On the other hand, when the continuous amount and / or the size of the paper is small, the skew feed correction by the inserter roller is selected, and although there is a disadvantage that the skew feed correction of the paper takes a little time, there is an advantage of preventing the damage of the paper. And prioritized reliability.

The selection of the skewed sheet correcting means may be automatically performed by a signal from a detecting means provided facing the sheet conveying path, or may be made by a signal inputted in advance.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic explanatory view showing an example of an OCR device in an embodiment of the present invention, and the same parts are designated by the same reference numerals as those in FIG. In FIG. 1, 15,
A pick sensor 16 and a continuous amount / size detection sensor 16 are provided on the upstream side and the downstream side of the inserter roller 7 in the sheet conveying direction. Reference numeral 17 denotes a shutter, which is formed as will be described later and is rotatably provided near the inserter roller 7. A conveyance roller 18 is provided along the paper conveyance path 19 at appropriate intervals. A print head 20 is provided so as to face the paper transport path 19.

2 and 3 are enlarged explanatory views showing the vicinity of the inserter roller 7 in FIG. 1, and FIG. 4 is an enlarged perspective view showing the vicinity of the inserter roller 7 in FIG. 1, and the same portions are the same as those in FIG. It is indicated by a reference numeral. 2 to 4
In the figure, reference numeral 21 denotes a drive roller, which is formed in a hollow short cylindrical shape, is arranged on the drive roller shaft 22 with an appropriate interval, and is integrally rotatable with the drive roller shaft 22 in the forward and reverse directions.
Reference numeral 23 is a subordinate roller, which abuts on the driving roller 21 and is rotatably formed. The driving roller 21 and the dependent roller 23 form a pair, and constitute the inserter roller 7.

Next, 31 is an arm, which is the drive roller 21.
It is formed in a substantially C-shape having a turning radius larger than the diameter of, and is turnable integrally with the base 32 and via a turning shaft 33. A paper contacting piece 34 is fixed to the free end of the arm 31, and the paper contacting piece 34 is located upstream of the paper conveyance from the contact portion (nip portion) between the drive roller 21 and the driven roller 23 (see FIGS. 2 to 4). The shutter 17 is configured by being formed so as to face the right side of FIG. Reference numeral 35 is an operation link, which is fixed to the rotary shaft 33, and an operating rod 37 of a solenoid 36 is connected to the free end thereof. Reference numeral 38 denotes a return spring, which is interposed in the operation link 35.

The function of correcting the skew of the sheet by the shutter 17 having the above structure will be described. 2 shows the shutter 1
7 shows the inoperative state, and FIGS.
Shows the operating state of.

First, as shown in FIG. 2, the sheet 36 is picked up by the pick roller 4 from the time when the solenoid 36 is OFF and the shutter 17 is in the inoperative state by the return spring 38, and the leading edge of the sheet 2 is removed. When reaching the pick sensor 15, the solenoid 36 is turned on and the operating rod 3
Move 7 to the left. As a result, the shutter 17 rotates in the clockwise direction together with the rotation shaft 33 via the operation link 35, and the paper contact piece 34 provided at the free end of the arm 31 moves the paper conveyance path 19, that is, the drive roller 21 and the driven roller. It is rotated so as to face the plane including the contact portion (nip portion) with 23 and to be located on the upstream side of the sheet conveyance from this contact portion (see FIG. 3). The drive roller 21 and the driven roller 23 are rotating in the arrow direction, that is, the paper transport direction.

In this state, the paper 2 is picked up by the pick roller 4
After being conveyed by a predetermined distance, the leading end of the sheet 2 comes into contact with the sheet contacting piece 34, and the sheet is slightly over-fed as shown in FIG. 3, and the skewed state is corrected. The paper contact piece 34
Is located upstream of the contact portion between the drive roller 21 and the driven roller 23 in the sheet conveying direction, and therefore the sheet 2 is not yet caught between the drive roller 21 and the driven roller 23.

After the skew correction for the sheet 2 is performed,
When the solenoid 36 is turned off in FIG. 3, the shutter 17 is rotated counterclockwise by the return spring 38, and the state shown in FIG. 2 is obtained. Therefore, the sheet abutting piece 34 is retracted from the sheet conveying path 19, and the sheet 2 is bent between the drive roller 21 and the driven roller 23 forming the inserter roller 7 due to the expansion of the deflection as shown in FIG. It is transported by being inserted.

After the sheet 2 passes through the inserter roller 7, when the skew feeding correction of the next sheet 2 is performed, the solenoid 36 is turned on in FIG. 2 so that the shutter is released as shown in FIGS. 3 and 4. Since the paper 17 is rotated clockwise and the paper contact piece 34 faces the paper transport path 19, the paper skew correction can be performed as described above.

Next, in the present invention, as the skewed sheet correcting means, either the shutter 17 as described above or the inserter roller 7 shown in FIGS. 11 to 13 is selected. However, the mode of this selection will be described.

FIG. 5 shows the relationship between the continuous paper amount and the paper size.
Shows an example of the skew feed correction table for selecting the skew feed correction means.
You In the figure, the chain line indicates the boundary line of the skew feeding correction means.
Area R ₁Is the correction range by inserter roller, area R₂Is
This is the correction range of the shutter, and the CPU (central control
Device) memory. That is, skew correction
Consecutive amount of target paper (for example, paper thickness) and paper support
Area R ₁And area R₂Select either
The continuous quantity and size shown in FIGS. 1 to 3, for example.
The detection signal from the detection sensor 16, or the continuous amount and the size.
Selected based on the signal from the input means
It

FIG. 6 is a flow chart showing a mode for selecting the skew feeding correcting means in the embodiment of the present invention. In FIG. 6, the flow is started, that is, reading is started (step S1), whether or not there is a designation input from the input means (step S2) is determined, and if there is a designation input regarding the continuous amount and size of the paper in advance, the step If the sheet is thin in step S3, the process proceeds to skew correction by the inserter roller (step S4). If the sheet is not thin in step S3, skew correction by the shutter is performed (step S5). Proceed.

That is, when the sheet to be skew-corrected is thin, loss time required for skew-correction occurs, so that the skew-correction means by the inserter roller is selected giving priority to the prevention of sheet damage. . On the other hand, when the continuous amount of paper is large, that is, when the paper is thick, damage to the paper due to skew correction does not occur, so the skew correction means using a shutter that can improve the processing speed is selected. In this way, the optimum skew feeding correcting means is selected according to the sheet for skew feeding correction.

Next, in step S2, when there is no designation input from the input means, skew feeding correction is performed on the first sheet by the inserter roller to prevent sheet damage (step S6). Then, the continuous amount / size detection sensor 16 shown in FIGS. 1 to 3 detects the continuous amount / size of this sheet (step S7). If the sheet is thin (step S8), if the sheet is thin, then 2 For the second and subsequent sheets, the skew feeding correction by the inserter roller is performed (step S9). When the sheet is not thin, the skew feeding correction by the shutter is performed for the second and subsequent sheets (step S10), and the optimal skew feeding correction is performed as described above. Select the means.

FIG. 7 is a perspective view of a main part showing a shutter and its vicinity in another embodiment of the present invention, FIG. 8 is a view of the main part in the direction of arrow A in FIG. 7, and FIG. 9B is a sectional view taken along line BB in FIG. 8A, and the same portions are denoted by the same reference numerals as those in FIGS. 2 to 4.

In FIG. 7 to FIG. 9, reference numeral 24 denotes a hollow tubular body, which is loosely fitted to the drive roller shaft 22 and is provided so as to restrain the movement in the axial direction. Reference numerals 25 and 26 denote a sheet contact piece and a locking piece, respectively, which are integrally provided on the outer periphery of the hollow tube body 24. These constitute the shutter 17. The sheet contact piece 25 is formed to have a radial dimension larger than the radius of the drive roller 21, and the locking piece 26 is formed to have a radial dimension smaller than the radius of the drive roller 21. Is about 180 ° at the central angle
And different positions in the axial direction. The paper contact piece 25 is formed so as to face the paper transport upstream side (right side in FIGS. 7 and 9) from the contact portion (nip portion) between the drive roller 21 and the driven roller 23.

Numeral 27 is a stopper rod, which is the drive roller shaft 2
It is provided substantially in parallel with 2 and is movable in the direction along the drive roller shaft 22. Reference numeral 28 denotes a stopper, which is formed in a substantially L-shape, is fixed to the stopper rod 27, and is selectively engageable with and disengageable from the sheet contact piece 25 and the locking piece 26 on the upstream side of the sheet conveyance. . Reference numerals 36 and 30 denote solenoids and return springs, respectively, which serve as the stopper rod 2
Connect to both ends of 7.

With the above structure, when the driving roller 21 is rotated in the state where the stopper rod 27 is pulled through the operating rod 37 by the urging force of the solenoid 36, the driven roller 2 is rotated.
3, the hollow tube 24 is stationary with the sheet contacting piece 25 facing upward because the stopper 28 and the locking piece 26 are engaged with each other. The reference numeral 25 is located upstream of the sheet conveyance from the contact portion between the driving roller 21 and the driven roller 23. In this state, the paper 2 is picked up by the pick roller 3 and the separation roller 4 as shown in FIG.
When picked up and conveyed by, the leading edge of the sheet 2 contacts the sheet contact piece 25 shown in FIGS. 7 to 9. Then, the skewed state is corrected by further feeding the sheet as described above.

When the bias of the solenoid 36 in FIG. 7 is released after the skew correction is performed, the stopper rod 27 is moved in the direction of arrow C by the return spring 30, and the stopper 28 is moved.
Is disengaged from the locking piece 26. At this time, since the drive roller shaft 22 is rotating, the hollow tube body 24 is rotated in the same direction as the drive roller shaft 22 by the frictional force, and the paper contact piece 25 is moved to the paper transport path (the drive roller 21 and the driven roller). 23
The sheet is retracted from the plane including the contact portion with the sheet), and the sheet is conveyed by being caught between the driving roller 21 and the driven roller 23.

On the other hand, when the stopper 28 moves, the stopper 28 comes into contact with the rotation path of the sheet contact piece 25, so that it engages with the sheet contact piece 25 as shown in FIG. 8B. The subsequent rotation of the hollow tube body 24 is prevented. In this case, the locking piece 26 is located above the hollow tube body 24, but the radial dimension of the locking piece 26 is smaller than the radius of the drive roller 21. It does not stick out. Therefore, the paper can be transported smoothly.

In order to correct the skew feeding of the next sheet after passing the sheet, if the solenoid 36 is urged to pull the stopper rod 27 in FIG. 7, the stopper 28 moves to the locking piece 26 side. The sheet contact piece 25 is positioned above, and the sheet skew correction can be performed as described above.

In the above embodiment, the stopper rod 27
Although the example in which the solenoid 36 is used as the drive source of the rotating shaft 33 has been described, other drive sources may be used. In short, the sheet contacting pieces 25 and 34 may be the sheet conveying path or the nip of the inserter roller pair. Any structure may be used as long as it selectively faces the upstream side of the sheet conveyance position.

In the above embodiment, for example, OCR
Although the apparatus has been described, the present invention is also applicable to a combined use of a printing apparatus or a single skew feeding correction apparatus in another printing apparatus.

[0046]

Since the present invention has the structure and operation as described above, the skew feed correction by the inserter roller and the shutter are performed in advance or automatically depending on the continuous amount and / or size of the sheet to be skew feed correction. It is possible to select either skew feeding correction, and it is possible to perform optimum skew feeding correction for various types of sheets.

[Brief description of drawings]

FIG. 1 is a structural explanatory view schematically showing an example of an OCR device according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view showing the vicinity of the inserter roller 7 in FIG. 1, showing a shutter 17 in an inoperative state.

3 is an enlarged explanatory view showing the vicinity of the inserter roller 7 in FIG. 1, showing an operating state of a shutter 17. FIG.

4 is an enlarged perspective view showing the vicinity of the inserter roller 7 in FIG. 1, showing an operating state of a shutter 17. FIG.

FIG. 5 is a diagram showing an example of a skew feeding correction table for selecting skew feeding correcting means in the relationship between the continuous sheet amount and the sheet size.

FIG. 6 is a flowchart showing a mode of selecting skew feeding correcting means in the embodiment of the present invention.

FIG. 7 is a perspective view of a main part showing a shutter and its vicinity according to another embodiment of the present invention.

FIG. 8 is a view of a main part in the direction of arrow A in FIG. 7, (a)
Indicates a skewed sheet correction state, and (b) indicates a sheet conveyance state.

9 is a cross-sectional view taken along line BB in FIG. 8 (a).

FIG. 10 is a structural explanatory view schematically showing an example of a conventional OCR device.

FIG. 11 is an explanatory diagram of a sheet conveyance state in a conventional example.

FIG. 12 is a diagram illustrating a sheet conveyance state in a conventional example.

FIG. 13 is an explanatory diagram of a sheet conveyance state in a conventional example.

FIG. 14 is a main-portion plan view illustrating a skew feeding correction state.

[Explanation of symbols]

 7 Insert roller 17 Shutter

Claims (4)

[Claims] 1. A paper transport mechanism for automatically transporting a plurality of paper sheets stacked on a hopper, and a processing mechanism for processing the transported paper sheets, wherein the paper transport mechanism includes at least the paper transport mechanism. An automatic paper feed mechanism having a hopper mechanism for moving the sheets stacked on the hopper to a predetermined preparation position, a pick mechanism for picking up one sheet placed at this preparation position, and a feed mechanism for conveying the paper In the skew feeding correction device in the sheet feeding device, the pair of inserter rollers forming the sheet transport mechanism are formed to be rotatable in the forward and reverse directions, and the sheet is positioned at a position upstream of the nip portion of the pair of inserter rollers in the sheet transport direction. A shutter is formed so that the contact piece selectively faces the sheet conveyance path, and a signal from a unit for detecting the continuous amount and size of the sheet provided so as to face the sheet conveyance path is detected. Corresponding to the above, it is configured to select either skewed sheet correction by reverse rotation of the pair of inserter rollers or skewed sheet correction by contact of the sheet contact piece of the shutter. Paper skew correction device in the device. 2. A paper transport mechanism for automatically transporting a plurality of sheets stacked on a hopper, and a processing mechanism for processing the transported paper, wherein the paper transport mechanism includes at least the above-mentioned paper transport mechanism. An automatic paper feed mechanism having a hopper mechanism for moving the sheets stacked on the hopper to a predetermined preparation position, a pick mechanism for picking up one sheet placed at this preparation position, and a feed mechanism for conveying the paper In the skew feeding correction device in the sheet feeding device, the pair of inserter rollers forming the sheet transport mechanism are formed to be rotatable in the forward and reverse directions, and the sheet is positioned at a position upstream of the nip portion of the pair of inserter rollers in the sheet transport direction. A shutter is provided so that the contact piece selectively faces the sheet conveyance path, and input means for inputting a signal regarding the continuous amount and size of the sheet is provided. According to a signal from the step, it is configured to select one of a skewed sheet correction by reverse rotation of the inserter roller pair and a skewed sheet correction by contact of a sheet contact piece of the shutter. Paper skew correction device in a paper feeding device. 3. A shutter is constructed by rotatably providing an arm having a turning radius larger than the diameter of the rollers of the inserter roller pair, and providing a paper contact piece at the free end of the arm. The sheet skew correcting device in the sheet feeding device according to claim 1 or 2. 4. A sheet contact piece having a radial length larger than the radius of the drive roller, and a radius of the drive roller, in a hollow tube body that is loosely rotatably fitted to the drive roller shaft of the inserter roller pair. A stopper is formed integrally with a locking piece having a smaller radial length to form a shutter, and a stopper formed selectively and disengageably with the paper contact piece and the locking piece is provided on the drive roller shaft. The sheet skew correcting device in the sheet feeding device according to claim 1 or 2, wherein the sheet skew correcting device is provided so as to be movable in a direction along.