JPH11314802A - Side edge truing up method and device for sheet body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a carrier defective of a sheet body and effectively improve a set degree of freedom of a tip location of the sheet body when a side edge is trued up. SOLUTION: This device is provided with a supporting means 50 holding a stimulable phosphor sheet 20 carried to a side edge truing up location from the sides of both the surfaces 20a, 20b and a side edge truing up means 52 pressing one side surface 20c of the stimulable phosphor sheet 20 held by the supporting means 50 and performing a side edge truing-up for the stimulable phosphor sheet 20 by making the other side surface 20d of the stimulable phosphor sheet 20 as a reference. The supporting means 50 is provided with a pressing roller 54 rotatable when the side edge truing-up in the direction of the arrow C is performed for the stimulable phosphor sheet 20 in a state that the means 50 comes into contact with the surface 20a of the stimulable phosphor sheet 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for shifting a sheet, such as a photographic film or a stimulable phosphor sheet, in a direction intersecting a conveying direction.

[0002]

2. Description of the Related Art For example, stimulable phosphors (stimulable phosphors)
There is known a system that once records radiation image information of a subject such as a human body, reproduces the radiation image information on a photographic photosensitive material such as a photographic film, or outputs a visible image on a CRT or the like. I have.

The stimulable phosphor is composed of radiation (X-ray, α-ray, γ
(Rays, electron beams, ultraviolet rays, etc.), a part of this radiation energy is accumulated, and after irradiation with excitation light such as visible light, a phosphor that emits stimulated emission according to the accumulated energy is referred to. The stimulable phosphor is usually formed in a sheet shape and used as a stimulable phosphor sheet, and the stimulable phosphor sheets are handled one by one in a cassette.

In the above system, for example, a reading section for reading image information recorded on the stimulable phosphor sheet and an erasing section for erasing image information remaining on the stimulable phosphor sheet after reading are provided. An image information reading device is employed. In this image information reading apparatus, a cassette accommodating a stimulable phosphor sheet on which radiation image information of a subject is recorded by an external photographing device is inserted into a loading section. Next, with the cassette opened, the stimulable phosphor sheet is taken out of the cassette under the action of the suction mechanism, and the stimulable phosphor sheet is transported to the reading unit via the sheet transport mechanism. The stimulable phosphor sheet read by the reading unit is stored in a cassette arranged in the loading unit after the afterimage is deleted by the erasing unit.

On the other hand, in the above system, an image information reproducing apparatus for reproducing radiation image information on a photographic photosensitive material such as a photographic film is used. In this image information reproducing apparatus, the photographic photosensitive materials are taken out one by one from a magazine containing a plurality of photographic photosensitive materials under the action of a suction mechanism and transferred to a sheet body transport mechanism. Is transferred to the recording unit via the. In the recording unit, radiation image information obtained from the stimulable phosphor sheet is exposed and recorded by irradiation with laser light or the like.

[0006]

In the above-described image information reading apparatus and image information reproducing apparatus, a sheet such as a stimulable phosphor sheet or a photographic film conveyed in the apparatus main body is provided to a reading section or a recording section. Immediately before the sheet is conveyed, a structure is adopted in which the sheet body is shifted in a direction crossing the conveying direction. The sheet body, for example, is likely to be misaligned in the width direction when conveyed by conveying means such as a roller pair,
This is because, in order to perform highly accurate reading processing and exposure recording processing, it is necessary to reliably shift the sheet body.

For example, a conventional width shifting device 2 shown in FIG.
Is a stopper means 5 for holding the leading end of the sheet body 4 conveyed in the direction of the arrow X via the roller pair 3, and a width shifter for pushing the sheet body 4 to a reference position on one side surface thereof. Means (not shown).

When the sheet body 4 is conveyed to the vicinity of the width approach position, the nipping by the roller pair 3 is released, and the sheet body 4 falls to the stopper means 5 by its own weight. Then
The other side surface of the sheet body 4 held by the stopper means 5 is pressed to one side surface side of the sheet body 4 via the width approaching means to perform the width approaching process. And the stopper means 5
The roller pair 3 nips the sheet body 4 and conveys the sheet body 4 to the scanning unit 6. In the scanning unit 6, the sheet body 4 is conveyed in the sub-scanning direction under the rotation of a pair of rollers 7 and 8, and the scanning surface of the sheet body 4 is irradiated with a laser beam to form an image. Reading or image recording is performed.

However, in the above-described conventional technique, when the sheet member 4 is sent to the stopper means 5 by its own weight, the sheet member 4 may not be conveyed accurately to the stopper means 5. Further, the stopper means 5 needs to be separated from the conveyance path of the sheet body 4 when the width-processed sheet body 4 is conveyed, and usually, the driving means interlocked with the width approach means from an economic viewpoint. Through the transport path. As a result, for example, it is not possible to install the stopper means 5 between the pair of rollers 7 and 8, so that the installation place of the stopper means 5 is restricted, and the degree of freedom in designing the leading end position of the sheet body at the time of width shifting is reduced. Problem has been pointed out.

SUMMARY OF THE INVENTION The present invention is to solve this kind of problem.
It is an object of the present invention to provide a method and an apparatus for shifting the width of a sheet body that can effectively improve the degree of freedom in designing the position of the leading end of the sheet body when the width is shifted.

[0011]

According to the method and the apparatus for shifting the width of the sheet member according to the present invention, after the sheet member is conveyed to the width-adjusting position via the conveying means, the sheet member is supported from both sides. While the holding action by the transporting means is released. Next, one side surface of the sheet body sandwiched only by the support means is pressed, and the sheet body is shifted in width with reference to the other side surface side. Then, after the supporting means is separated from the shifted sheet body, the sheet body is conveyed.

Therefore, there is no need to send the sheet from the conveying means to the stopper by free fall, and the sheet can be reliably conveyed to the width approach position. In addition, since both sides of the sheet body are sandwiched by the support means, the leading end position of the sheet body at the width approach position can be variously set, and the degree of freedom in designing the leading end position of the sheet body is effectively improved.

Further, the supporting means includes a rotation pressing member which is rotatable in contact with the surface of the sheet member, and when the sheet member is shifted in width, the surface of the sheet member, particularly, the scanning surface is adjusted. The scanning surface can be effectively protected without being rubbed by the rotation pressing member. Moreover, the rotation pressing member can advance and retreat with respect to the surface of the sheet body,
The rotation pressing member and the guide member can securely hold both sides of the sheet body.

Further, according to the present invention, when the sheet body is fed to the scanning section for reading or recording an image, the leading end of the sheet body in the conveying direction is a sub-scanning means constituting the scanning section. Then, the sheet body is nipped by the support means while the holding action of the sheet body by the transport means is released. Then
After one side surface of the sheet body sandwiched only by the support means is pressed and the sheet body is shifted in width, the support means is separated from the sheet body, and the sheet body is further moved through the sub-scanning conveyance means. It is transported in the sub-scanning direction.

For this reason, after the width of the sheet body is adjusted, it is not necessary to pinch and convey the sheet body by the conveying means, and the sheet body is directly moved in the sub-scanning direction via the sub-scanning conveying means. Conveyed. Therefore, it is possible to quickly and easily shift from the sheet body width adjustment processing to the sheet body image reading or image recording work, and the efficiency of the entire width adjustment work can be easily achieved.

[0016]

FIG. 1 is a schematic structural explanatory view of an image information reading apparatus 12 in which a sheet width shifting apparatus 10 according to an embodiment of the present invention is incorporated.

A touch panel 14 having a scanning unit and a monitor function is provided above the front surface (scanning surface) of the image information reading device 12, and a cassette loading unit 18 to which a cassette 16 can be attached and detached is provided below the touch panel 14. Can be The cassette 16 is a stimulable phosphor sheet (sheet body).
20, and an opening 24 of the housing 22.
The cassette loading portion 18 is provided with an opening / closing means (not shown) for opening and closing the lid 26.

The stimulable phosphor sheet 20 housed in the cassette 16 is taken out of the cassette loading section 18 and the stimulable phosphor sheet 20 after reading and erasing described later is returned into the cassette 16. A sheet unit 28 is provided. The single-wafer portion 28 includes a plurality of suction disks 30 communicating with a negative pressure source (not shown).

An erasing unit 34, a width shifting unit 35, and a reading unit 36 are provided below the sheet unit 28 via a transport system 32. The transport system 32 includes a plurality of pairs of rollers 38 that form a pair, and a plurality of erasing light sources 40 that constitute the erasing unit 34 are arranged on a vertical transport path formed by the pair of rollers 38.

The storable phosphor sheet 2
Conveying means 42 for conveying 0 along a curved conveying path;
The width shifting device 10 according to the present embodiment that adjusts the width of the stimulable phosphor sheet 20 transported to the width shifting position via the transport unit 42 is incorporated. The conveying means 42
Roller pairs 44 and 46 which can be opened and closed, respectively, and guide plates 48a to 48 for guiding the stimulable phosphor sheet 20 sandwiched between the roller pairs 44 and 46 along a curved conveyance path.
d.

As shown in FIGS. 2 and 3, the width-shifting device 10 supports the stimulable phosphor sheet 20 conveyed to the width-shifting position via the conveying means 42 from both sides 20a and 20b. 50 and one side surface 20c of the stimulable phosphor sheet 20 sandwiched by the support means 50, and the stimulable phosphor sheet 20 is moved with reference to the other side surface 20d of the stimulable phosphor sheet 20. And a width shifting means 52 for shifting the width.

The supporting means 50 is provided for storing the stimulable phosphor sheet 20.
A guide plate (guide member) 48c disposed on the surface 20b side, which is the back surface side, and a pressing roller (rotation pressing member) 54 disposed on the surface 20a side, which is the scanning surface side of the stimulable phosphor sheet 20, Is provided. The pressing roller 54 is, for example,
It is rotatably mounted on a casing 56 that can swing up and down (arrow D direction) and is elastically supported via a spring 57. The axis of the pressing roller 54 is
The direction is perpendicular to the direction of shifting the width of the stimulable phosphor sheet 20 (the direction of arrow C). The lower end of the pressing roller 54 protrudes downward from the lower end surface of the casing 56 to protrude from the stimulable phosphor sheet 2.
0 surface 20a.

The width shifting means 52 includes the stimulable phosphor sheet 2.
The first and the second arranged on the side of the zero-width reference P1
The stimulable phosphor sheet 20 is disposed on the pressing side P2 facing the rotating bodies 58 and 60, and
First and second outer peripheral surfaces 58a, 60 of rotating bodies 58, 60
It has the function of pressing against width a. The first and second rotators 58 and 60 are rotatable in a direction intersecting the surface direction of the stimulable phosphor sheet 20.

The width shifting means 52 has a motor 62, and a pulley 66 is fixed to a rotation drive shaft 64 of the motor 62. The pulley 68 is arranged at a predetermined distance from the pulley 66 in a direction (arrow C direction) crossing the transport direction,
A timing belt 70 is stretched over the pulleys 66 and 68. A movable table 74 is connected to an end of the timing belt 70 via a bracket 72. A guide section 76 is provided below the movable base 74, and the guide section 76 is guided by a rail 78 extending in the direction of arrow C and can move forward and backward.

One end of each of the first and second swing arms 80 and 82 is swingably supported on the movable base 74.
And first and second rotary push-in bodies that contact the other end of the second swing arms 80 and 82 with one side surface 20c of the stimulable phosphor sheet 20 to push the stimulable phosphor sheet 20 to the side of the reference P1. 84 and 86 are mounted. The locking directions of the first and second rotary push bodies 84 and 86 are different from each other via the one-way clutch. Specifically, the first rotary push body 84 is indicated by an arrow E in FIG.
Direction, and can be rotated only in the second direction.
Can rotate only in the direction of arrow F.

The first and second springs 8 are provided at substantially the center of the first and second swing arms 80 and 82 and the movable table 74.
8a, 88b are arranged, and the first and second springs 88a, 88b are connected to the first and second swing arms 8a, 88b.
0 and 82 are pulled in the arrow C direction. On the movable base 74, stoppers 90a and 90b for restricting the swing range of the first and second swing arms 80 and 82 are fixed.

As shown in FIG. 1, the reading section 36 includes a sub-scanning transport mechanism 92 for transporting the stimulable phosphor sheet 20 taken out of the cassette 16 in the sub-scanning direction (the direction of arrow A).
And the stimulable phosphor sheet 2 conveyed in the sub-scanning direction
An optical system 94 for irradiating the laser light L in the main scanning direction (a direction substantially orthogonal to the sub-scanning direction) with respect to 0, and the photostimulated light emitted from the stimulable phosphor sheet 20 by the irradiation of the laser light L is photoelectrically emitted. And a light-collecting system 96 for reading.

The sub-scanning transport mechanism 92 includes first and second roller pairs 98 and 100 which are driven to rotate in synchronization with each other, while the light condensing system 96 transmits the laser light L on the stimulable phosphor sheet 20. The light guide 102 includes a light guide 102 disposed at a scanning position along a main scanning line, and a photomultiplier 104 mounted on the light guide 102.

The operation of the width adjusting device 10 configured as described above will be described below in relation to the image information reading device 12 incorporating the same.

First, the stimulable phosphor sheet 20 on which radiation image information of a subject such as a human body is recorded by a photographing device (not shown) is housed in a cassette 16 in a light-shielded state to constitute the image information reading device 12. Cassette loading section 1
Set to 8. When the cassette 16 is loaded, the lid 26 of the cassette 16 is swung to a predetermined angular position by an unlocking means (not shown) provided in the cassette loading section 18, and the opening 24 is opened.

Next, the suction disk 30 is moved into the cassette 16 under the driving action of the sheet unit 28, and the stimulable phosphor sheet 20 in the cassette 16 is sucked by the suction disk 30. Furthermore, the suction disk 30 is provided with the storage phosphor sheet 2.
0, the cassette 16 and the transport system 32
Side, the stimulable phosphor sheet 20
Is pinched by a pair of rollers 38 constituting the transport system 32.

At this time, the holding of the stimulable phosphor sheet 20 by the suction disk 30 is released. As a result, the stimulable phosphor sheet 20 is delivered to the transport system 32, and under the action of the transport system 32, the stimulable phosphor sheet 20 once passes through the erasing section 34 to the width approaching section 35. Conveyed.

In the width shifting unit 35, the stimulable phosphor sheet 20 is conveyed in the direction of arrow B by the rotation of the roller pairs 44 and 46, and the leading end thereof constitutes the first roller pair 98 constituting the sub-scanning conveyance mechanism 92. It is inserted between them (see FIG. 4). Then
The support means 50 is driven to displace the tip end of the casing 56 downward, and the end face of the pressing roller 54 rotatably supported by the casing 56 is attached to the stimulable phosphor sheet 2.
The stimulable phosphor sheet 20 is elastically pushed by contacting the surface 0 (scanning surface) 20a. For this reason, while the stimulable phosphor sheet 20 is sandwiched between the pressing roller 54 and the guide plate 48c, the roller pair 44, 46 is opened and the holding action of the stimulable phosphor sheet 20 by these is released ( (See FIG. 5).

Then, the motor 62 constituting the width shifting means 52 is driven. As shown in FIG. 2, when the pulley 66 rotates in the direction of the arrow integrally with the rotary drive shaft 64 under the driving action of the motor 62, the pulley 66 passes through the timing belt 70 stretched over the pulley 66 and the pulley 68. , Movable table 7
4 moves in the direction of arrow C under the guide action of the guide portion 76 and the rail 78.

Here, the stimulable phosphor sheet 20 corresponds to FIG.
When it is inclined upward to the left, the second rotary pusher 86 attached to the movable base 74 comes into contact with one side surface 20c of the stimulable phosphor sheet 20, and the tip side of the one side surface 20c is moved. Push in the direction of arrow G. Therefore, the stimulable phosphor sheet 20 is arranged such that the rear end side of the other side surface 20d is the first rotating body 58.
Rotate in the direction of arrow H while being in contact with the first outer peripheral surface 58a of the first rotating surface 58a.
60 is brought into contact with the first and second outer peripheral surfaces 58b, 60b, and is shifted toward the width adjustment reference P1 side.

After the width adjustment processing of the stimulable phosphor sheet 20 is completed, the first roller pair 98 constituting the sub-scanning transport mechanism 92 is closed to clamp the stimulable phosphor sheet 20. On the other hand, the pressing roller 54 constituting the supporting means 50 is displaced vertically upward, and the holding action of the stimulable phosphor sheet 20 by the supporting means 50 is released (see FIG. 6).

In the reading section 36, the first and second roller pairs 98 and 100 are driven to rotate in synchronization with each other, so that the stimulable phosphor sheet 20 is applied to the first and second roller pairs 98 and 100.
While being conveyed in the sub-scanning direction (direction of arrow A) via 100, the optical system 94 is driven to irradiate the stimulable phosphor sheet 20 with the laser beam L in the main scanning direction (FIG. 1).
reference). Therefore, stimulable luminescent light is emitted from the stimulable phosphor sheet 20, and the stimulable luminescent light is guided from the light guide 102 to the photomultiplier 104, and the radiation accumulated and recorded on the stimulable phosphor sheet 20. Image information is read photoelectrically.

The stimulable phosphor sheet 20 that has been subjected to the reading processing of the radiation image information by the reading unit 36 is transferred to the transport system 3.
2, the remaining radiation image information is erased via a plurality of erasing light sources 40 provided in the erasing unit 34 when the image is moved vertically upward. And
After the stimulable phosphor sheet 20 is fed into the cassette 16 via the sheet portion 28, the cassette 16 is pulled out from the cassette loading section 18. At this time, since the lid 26 closes toward the housing 22 via a lid (not shown), the cassette 16 is taken out of the image information reading device 12 with the opening 24 being shielded from light.

In this case, in this embodiment, the roller pair 4
After the stimulable phosphor sheet 20 conveyed in the direction of the arrow B via the fourth and the fourth 46 is arranged at the position of the width approach, the supporting means 50
Of the stimulable phosphor sheet 20 is sandwiched between the pressing roller 54 and the guide plate 48c. Next, after the roller pairs 44 and 46 are opened, the stimulable phosphor sheet 20 is pushed into the width-shifting reference P1 side via the width-shifting means 52, and is moved through the first and second rotating bodies 58 and 60. A width adjustment process is performed.

Therefore, the stimulable phosphor sheet 20 can be smoothly and reliably fed to the width approaching position as compared with the case where the stimulable phosphor sheet 20 is transferred to the width approaching position by its own weight.

Here, the pressing roller 54 constituting the supporting means 50 is rotatable in the direction of arrow C. Then, the surface 2 of the stimulable phosphor sheet 20 is
When the stimulable phosphor sheet 20 is pushed in the direction of the arrow C via the width shifting means 52 while holding 0a,
The pressing roller 54 is attached to the surface 2 of the stimulable phosphor sheet 20.
It rotates in a state of contact with 0a. Therefore, the pressing roller 5
4 and the surface 20a of the stimulable phosphor sheet 20 are effectively reduced, and the effect that the surface 20a serving as the scanning surface can be reliably prevented from being damaged is obtained.

Further, in the present embodiment, since both surfaces 20a and 20b of the stimulable phosphor sheet 20 are sandwiched between the pressing roller 54 and the guide plate 48c, the leading end of the stimulable phosphor sheet 20 at the width approach position. The degree of freedom in position design is greatly improved. As a result, as shown in FIG. 5, the support means is inserted with the leading end of the stimulable phosphor sheet 20 inserted between the first roller pair 98 constituting the sub-scanning transport mechanism 92 via the roller pairs 44 and 46. At 50, the stimulable phosphor sheet 20 can be sandwiched from both sides 20a, 20b.

For this reason, after the width adjustment process of the stimulable phosphor sheet 20, the roller pair 44, 46 is closed and the reading unit 3 is moved.
6, the step of transporting the stimulable phosphor sheet 20 becomes unnecessary, and as shown in FIG. 6, while the roller pairs 44 and 46 are kept open, the accumulation is performed under the action of the first roller pair 98. The luminescent phosphor sheet 20 can be transported in the sub-scanning direction.

Therefore, in this embodiment, the stimulable phosphor sheet 20 immediately after the width adjustment can be directly conveyed in the sub-scanning direction while being sandwiched by the first roller pair 98, and the stimulable phosphor sheet 20 can be conveyed. The sheet 20 can be conveyed accurately and reliably in the sub-scanning direction. In addition, there is an effect that the entire width-adjusting conveyance process of the stimulable phosphor sheet 20 can be efficiently performed in a short time.

In this embodiment, as the support means 50, a guide plate 48c and a retractable pressing roller 54 which presses and holds the stimulable phosphor sheet 20 against the guide plate 48c are used. It is not limited. For example, a spherical body may be used instead of the pressing roller 54, a block body in which a cushioning material is stretched at a portion in contact with the surface 20a, or the stimulable phosphor sheet 20 may be pressed by the suction disk 30. You may. Also,
The pressing roller 54 and the like are fixed, and a pressing member that can move forward and backward can be used instead of the guide plate 48c.

Further, in the present embodiment, the reading unit 36
Is provided immediately in front of the image forming apparatus, and the stimulable phosphor sheet 20 after the width adjustment process is directly conveyed via the sub-scanning conveyance mechanism 92 constituting the reading unit 36. ing. However, the stimulable phosphor sheet 20 immediately after the width adjustment may be used depending on the installation location of the width adjustment unit 35 and the like.
May be transported while being held between the roller pairs 44 and 46.

In the present embodiment, the image information reading device 12 for reading and erasing the stimulable phosphor sheet 20 has been described. The same effect can be obtained even when incorporated in an image information reproducing apparatus that records and reproduces radiation image information on a photographic film.

[0048]

According to the method and the apparatus for shifting the width of the sheet member according to the present invention, when the sheet member is conveyed to the width-adjusting position via the conveying means, the sheet member is pinched from both sides by the supporting means. On the other hand, the holding action by the transport means is released. Next, after the sheet body sandwiched only by the support means is subjected to the width shifting process, the support means is separated from the sheet body. For this reason, compared with the conventional structure in which the sheet body is sent out to the stopper by its own weight, the sheet body is smoothly and reliably transported to the width approach position, and the width approach work of the sheet body is performed with high precision. Will be possible.

Further, in the present invention, after the leading end of the sheet in the conveying direction is inserted into the sub-scanning conveying means, the holding action by the conveying means is released and the sheet is nipped by the supporting means alone. In this state, after the width adjustment processing of the sheet member is performed, the supporting member is separated, and the sheet member is conveyed in the sub-scanning direction under the action of the sub-scanning conveying member.

As described above, the leading end of the sheet body faces the sub-scanning conveyance means, and there is no need to drive the conveyance means after the width adjustment processing of the sheet body, and the sheet body is moved via the sub-scanning conveyance means. , Can be directly conveyed in the sub-scanning direction. Thus, the sheet body can be transported with high precision, and the entire width adjustment processing of the sheet body can be efficiently performed in a short time.

[Brief description of the drawings]

FIG. 1 is a schematic structural explanatory view of an image information reading device incorporating a sheet width shifting device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective explanatory view of the width shifting device.

FIG. 3 is a schematic plan explanatory view of the width shifting device.

FIG. 4 is an operation explanatory diagram when a sheet is fed into the width shifting device.

FIG. 5 is an operation explanatory view when the sheet body is held from both sides by the width shifting device.

FIG. 6 is an explanatory diagram of an operation when the sheet body after the width is conveyed in the sub-scanning direction.

FIG. 7 is a schematic configuration explanatory view of a sheet width shifting device according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 10: width adjusting device 12: image information reading device 20: stimulable phosphor sheet 28: sheet part 32: conveying system 34: erasing unit 35: width adjusting unit 36: reading unit 42: conveying means 44, 46, 9
8, 100: roller pair 48a to 48d: guide plate 50: support means 52: width adjusting means 54: pressing rollers 58, 60: rotating bodies 84, 86 ... rotating press bodies 92: sub-scanning transport mechanism

Claims (5)

[Claims] 1. A sheet width shifting method for narrowing a sheet to be conveyed in a direction intersecting the conveying direction, wherein the step of conveying the sheet to a width shifting position via conveying means. A step of holding the sheet member disposed at the width shift position from both sides of the sheet member by supporting means, and releasing a holding action of the sheet member by the conveying means; and holding the sheet member only by the supporting means. A step of pressing one side surface of the sheet body and widening the sheet body with reference to the other side surface of the sheet body; and a step of separating the supporting means from the widened sheet body. A method for shifting the width of a sheet body, characterized in that: 2. A method for reading an image by irradiating a scanning surface of a sheet body with a laser beam in a main scanning direction and conveying the sheet body in a sub-scanning direction substantially orthogonal to the main scanning direction via a sub-scanning conveying means. For the scanning unit that performs image recording,
A method of shifting the width of a sheet body in a direction intersecting with the sub-scanning direction and feeding the sheet body, wherein a leading end of the sheet body in a conveyance direction is conveyed to the sub-scanning conveyance unit via a conveyance unit. A step of holding the sheet body by supporting means from both sides thereof, while releasing the holding action of the sheet body by the transport means; and one side of the sheet body held by only the supporting means. And pressing the sheet body relative to the other side of the sheet body, and after separating the supporting means from the widened sheet body, via the sub-scanning conveyance means Conveying the sheet in the sub-scanning direction. 3. A sheet width adjusting device for narrowing a conveyed sheet body in a direction intersecting the conveyance direction, wherein the sheet body conveyed to a width approaching position via a conveying means is provided.
Supporting means for nipping from both sides thereof, pressing means for pressing one side surface of the sheet body held only by the supporting means, and width adjusting means for widening the sheet body with reference to the other side surface of the sheet body; A width adjusting device for a sheet body, comprising: 4. The width shifting device according to claim 3, wherein said support means is arranged on a guide member disposed on one surface side of said sheet member, and is disposed on another surface side of said sheet member. And a rotation pressing member rotatable in contact with the other surface of the sheet body when the body is moved in a direction intersecting the transport direction. 5. The sheet width adjusting apparatus according to claim 4, wherein the rotation pressing member is configured to be able to advance and retreat with respect to the other surface of the sheet body.