JP3253496B2 - Roll sheet transport mechanism of image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a roll sheet transport mechanism of an image forming apparatus which is applied to an image forming apparatus for recording an image on a roll sheet pulled out from a roll body.

[0002]

2. Description of the Related Art In recent years, there has been provided an electrostatic copying machine capable of copying a document of a large size, for example, Japanese Industrial Standard A row 0 (hereinafter referred to as "A0 size"). Has been reached. The “A0 size” here is one of the finished dimensions of paper according to Japanese Industrial Standards,
841 (mm) x 1189 (mm).

[0003] Since it is difficult to handle a large copy sheet such as the A0 size one sheet at a time, usually, the above-mentioned copy sheet is formed by winding a strip-shaped continuous copy sheet around a core rod. Is formed, the roll sheet accommodated in the copying machine body is applied. 8A and 8B, which are schematic side views showing a schematic configuration of a sheet feeding mechanism, for an operation procedure when setting the roll sheet on which the roll body is formed in the copying machine main body. ,explain. In these figures, 309 is a base plate, 310,
311 is a guide plate.

First, at the time of setting, as shown in FIG. 8A, a rotation support plate 303 supporting one of the pair of paper feed rollers 301 and 302 is rotated around an axis 304. The rotation support plate 303 is rotated to open the sheet feeding path, and the opening position of the rotation support plate 303 is held by a lock mechanism (not shown). In this state, as shown in FIG. 8A, the roll body 305 is set on the supply reel 306 while supporting the roll body 305 with one hand, and the leading end of the roll sheet 307 pulled out from the roll body 305 with the other hand H. 3
08 is held at a predetermined set position while being pinched and supported.

Next, as shown in FIG. 8B, the rotation support plate 304 is rotated clockwise in the figure to hold the roll sheet 307 between the sheet feeding rollers 301 and 302. Thus, the hand H holding the tip 308 can be released. Note that, due to the sitting relationship, the weight of the rotation support plate 303 and the paper feeding roller 302 can provide a force for urging the paper feeding roller 302 toward the paper feeding roller 301.

[0006]

By the way, in the above setting method, the rotation support plate 304 is rotated,
Until the roll sheet 307 is nipped between the sheet feeding rollers 301 and 302, the leading end 308 of the roll sheet 307 is
However, the hands were blocked, and the operability during setting was poor. In addition, the operability at the time of setting is poor, so that the set leading end 308 is liable to be skewed, so that the jam due to the skewed conveyance of the roll sheet is likely to occur.

An object of the present invention is to provide a roll sheet for an image forming apparatus, which can easily set a roll body with a leading end of the roll sheet pulled out from the roll body positioned at a predetermined set position. The purpose is to provide a transport mechanism.

[0008]

Means for Solving the Problems To solve the above problems, 1) The invention according to claim 1 is a roll body formed by winding a long roll sheet, and a roll drawn from the roll body. A transport path for transporting the sheet to an image forming unit for recording an image on the roll sheet, and a roller for transporting a roll sheet sandwiched between the pair while sandwiching the transport path; A pair of conveying rollers that are pressed against and biased against the other by a predetermined urging force, and that can relatively separate each other against the urging force when replacing the roll sheet, The transport path is a row of the image forming apparatus having a portion extending upward in the transport direction above the transport roller.
In Sheets conveying mechanism, a pair of guide plates in a state of being opposed across a portion extending above Symbol upwardly defining at least part of the conveying path, is supported on one of the guide plates, the roll sheet An elastic thin plate elastically sandwiched between the other guide plate ;
When replacing the roll sheet, make sure that the end of the roll sheet is
Extends upward with a predetermined length from
Set upward in the set position set in the part,
Elastic repulsive force of the serial thin elastic plate can hold the leading edge of the roll sheet when replacing the roll sheet only push up from below, the tip of the roll sheet set position it so introduced between the other guide plate, and At the time of conveyance, the roll sheet is set so as to be allowed to be conveyed.

Conventionally, when a new roll body is set, a set position which is higher than the transport rollers is set until the roll sheet is nipped between the pair of transport rollers.
Although the leading end of the roll sheet had to be supported by hand, in the present invention, the leading end of the roll sheet can be held elastically between the elastic thin plate and the guide plate and held at the set position. .

Further , at the time of conveyance, the elastic thin plate can allow the conveyance of the roll sheet . 2) The roll sheet transport mechanism of the image forming apparatus according to claim 1, further comprising an elastic thin plate supported by the other guide plate, wherein a tip of the roll sheet is a double elastic thin plate. It is characterized in that it is sandwiched between and held at the set position.

According to the above configuration, the leading end of the roll sheet can be elastically held between the pair of elastic thin plates supported by the respective guide plates and held at the set position. According to a third aspect of the present invention, in the roll sheet transport mechanism of the image forming apparatus according to the first or second aspect, the elastic thin plate moves upward in the transport path as it goes upward.
It is characterized by being inclined with respect to each guide plate so as to reduce the width of the extending portion .

According to the above configuration, when the leading end of the roll sheet is pushed up from below along the transport path, the leading end is guided by an elastic thin plate or the like and is automatically held at the set position. Become. According to a fourth aspect of the present invention, in the roll sheet transport mechanism of the image forming apparatus according to any one of the first to third aspects, the elastic thin plate is a conductive sheet for removing an adsorbed charge of a roll sheet passing therethrough. It is characterized by containing a material.

According to the above construction, the conductive elastic thin plate is
Sliding contact with the conveyed roll sheet removes the adsorbed charge of the roll sheet. The invention according to claim 5 is the invention according to claim 1.
A roll sheet for an image forming apparatus according to any one of claims 1 to 4,
In the transport mechanism, the elastic thin plate corresponds to a corresponding guide plate.
Is provided continuously over the entire area in the width direction.
It is a sign.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view schematically illustrating an internal configuration of a copying machine according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating an external configuration, and FIG. 3 is a perspective view illustrating an external configuration of the copying machine during copying. FIG. This copying machine is for obtaining a copy image of a large size original such as A0 size. In this copying machine, while the original is being conveyed, the surface of the original is illuminated and scanned by an optical system fixedly arranged, and an image is formed based on the illuminated scanning.

Referring to FIG. 1, a copying machine main body 1 is provided with caster wheels 2 at a bottom portion so as to be freely movable. Referring to FIG. 1 to FIG.
A document transport unit 10 for transporting the document 9 along a document transport path 41 formed on the upper surface of the copying machine body 1
Is provided. A discharge port 54 from which the sheet on which the toner image is transferred is discharged is opened in the front surface 1a of the copying machine body 1. The sheet discharged from the discharge port 54 is
As shown in FIG. 3, while being guided by the guide member 91, the distal end of the copier body 1 is dropped with its tip downward, and is sequentially accommodated in the pocket 92 formed by the front cover 5 along the front surface 1a of the copying machine main body 1 through the introduction opening 93. It has become.
At the end of the upper surface of the copying machine body 1, an operation unit 100 provided with switches, keys, and the like for performing various settings related to copying is provided.

Referring to FIG. 1, a roll body 4A1, 4B1 and 4C1 is wound around a core in a roll shape at a lower portion from the center in the height direction inside the copying machine main body 1. Roll sheets 4A, 4 composed of upper, middle and lower three stages
B and 4C are accommodated. Each roll body 4A1, 4B
1 and 4C1 are supply reels 51, 52 and 5, respectively.
3 and is rotatably supported by a sheet feeding motor DM to be described later.
A, 4B and 4C can be fed and wound respectively. These roll sheets 4A, 4
Examples of the types of B and 4C include plain paper, film, and tracing paper.

A cut sheet, such as A0 size to A4 size, which has been cut to a predetermined length in advance, is supplied to a central portion of the copying machine body 1 through a manual paper feed section 30 on the front surface 1a of the copying machine body 1. A bypass paper feed path D4 is provided. Referring to FIG. 11, at least a part of the front surface 1a of the copying machine main body 1 is formed as a front door 1b which can be opened when the rolls of the roll sheets 4A, 4B and 4C are exchanged. In the main body 1, a front door opening / closing sensor 110 for detecting opening / closing of the front door 1b is arranged. In FIG. 11, illustration of the front cover 5 for forming the pocket 92 is omitted.

The upper roll sheet 4A includes the supply reel 51, the paper feed roller 61, and the conveyed roll sheet 4A.
A first leading edge detection switch 71 that detects the leading edge of the sheet, a transport roller 62, a cutter mechanism 80, a transport roller 63, a second leading edge detection switch 72 that detects the leading edge of each of the conveyed sheets 4A, 4B, 4C, and 4D. And a first paper feed path D1 to the photosensitive drum 20 via the transport rollers 33 in order.
Conveyed along.

The middle roll sheet 4B is supplied with a supply reel 5
2. Paper feed roller 64, third leading edge detection switch 73 for detecting the leading edge of rolled sheet 4B being transported, transport roller 62, cutter mechanism 80, transport roller 63, second leading edge detection switch 72, and transport roller 33 Sequentially through
The sheet is conveyed along a second sheet feeding path D2 that reaches the photosensitive drum 20. The path after the transport roller 62 is common to the first sheet feeding path D1.

The lower roll sheet 4C is provided with a supply reel 5
3. A pair of paper feed rollers 65a and 65b, a fourth leading edge detection switch 74 for detecting the leading edge of the conveyed roll sheet 4C, a transporting roller 62, a cutter mechanism 80, a transporting roller 63, and a second leading edge detection switch 72. , And transport roller 3
3 are sequentially conveyed along a third paper feed path D3 that reaches the photosensitive drum 20. The path after the transport roller 62 is common to the first sheet feeding path D1.

The bypass paper feed path D4 is provided with a fifth leading edge detection switch 75 for detecting the leading edge of the cut sheet 4D introduced from the manual paper feed unit 30, and a sliding contact plate (not shown). The separation roller 3 which separates the cut sheet by being slid on (separates one by one)
2. A path leading to the photosensitive drum 20 via the sixth leading edge detection switch 76 for detecting the leading edge of the cut sheet to be transported, the registration roller 39, the second leading edge detection switch 72, and the transport roller 33 in order. is there. The path after the second leading edge detection switch 72 on the bypass paper feeding path D4 is common to the first paper feeding path D1.

The cutter mechanism 80 is provided between a long fixed blade 81 extending in a direction orthogonal to the transport direction of the roll sheet 4A, 4B or 4C in the casing 80A, and the fixed blade 81. Rolled sheet 4A, 4
And a rotary blade 82 for cutting B or 4C. Each of the roll sheets 4A and 4A when the cutter mechanism 80 is conveyed
The transport direction of B and 4C is upward.

The document transport section 10 transports the document 9 by switching the transport direction to a forward direction R1 or a reverse direction R2. The image forming operation is performed when the document is transported in the forward direction R1. When a plurality of copies are made from the same document, the document transport unit 10 transports the document 9 by alternately switching the transport direction between a forward direction R1 and a reverse direction R2. Further, on the upper surface of the copying machine main body 1, a forward direction R1
The document transport path 41 is formed upstream of the document transport unit 10 to a position where the document transport path 41 approaches the upper surface of the copying machine main body 1.

The document transport section 10 includes a first document edge detecting switch 11, a first transport roller 12, a second document edge detecting switch 16, a second transport roller 14, And the third transport roller 15 are sequentially arranged. The first conveyance roller 12 starts to be driven when the first document end detection switch 11 is turned on from off and detects the leading end of the document 9 (the end on the downstream side in the forward direction R1). The second transport roller 14 is provided at a position facing the transparent plate 13 for slit exposure of the original 9, and brings the original 9 into close contact with the transparent plate 13. The third transport roller 15 discharges the exposed document 9.

The second document end detection switch 16
Is switched from off to on when the original 9 is conveyed in the forward direction R1, so that the original 9
Detect the tip of This second document end detection switch 16
Is turned on, the roll sheet 4A, 4B or 4C (hereinafter, the roll sheet A, 4B or 4C conveyed for transfer is simply referred to as "roll sheet 4")
Is started, and as a result, the conveyance of the document and the roll sheet 4 is synchronized.

The first document end detection switch 11
Is switched from on to off when the original 9 is conveyed in the forward direction R1, so that the original 9
Detect the rear end of At a predetermined timing after a lapse of a predetermined time from the timing of this detection, the cutter mechanism 80 is driven, and the roll sheet 4 is cut. In the present embodiment, the length of the feed path of the roll sheet 4 from the cutter mechanism 80 to the transfer position 20b of the transfer corona discharger 24 is determined by the length of the document feed from the first document end detection switch 11 to the document exposure position 44. The length is set to be longer than the length of the paper path by the length from the exposure position 20a of the photosensitive drum 20 to the transfer position 20b. Thus, an image corresponding to the rear end of the document 9 can be formed on the rear end of the roll sheet 4 obtained by cutting at the above timing.

The second document end detection switch 16
Is switched from on to off when the original 9 is conveyed in the reverse direction R2, so that the original 9
Detects the trailing end. This second document end detection switch 16
Is turned off, the transport rollers 12, 14, 1
5 is stopped. At this time, the leading end of the document 9 is held between the transport rollers 12, and is ready for the next copy operation. Reference numeral 8 denotes a reversing member for reversing the direction of the original to prevent the original 9 from dropping behind the copying machine body 1.

In connection with the transparent plate 13, a light source 17 which is a document scanning means for illuminating the document surface of the document 9 is fixedly arranged. The light from the light source 17 is applied to the surface of the document via the transparent plate 13. The light reflected from the surface of the original 9 is transmitted by the selfoc lens 18 to the copier main body 1.
Is guided to the surface of the photosensitive drum 20 provided substantially at the center. The surface of the photosensitive drum 20 before being exposed to the light from the selfoc lens 18 is uniformly charged by the charging corona discharger 21. Therefore, an electrostatic latent image corresponding to the original image is formed on the surface of the photosensitive drum 20 after the exposure. This electrostatic latent image is visualized into a toner image by the developing device 22. This toner image is guided to the vicinity of the transfer corona discharger 24 by rotating the photosensitive drum 20 in the direction of the arrow 23.

On the other hand, the roll sheet 4 guided to the photosensitive drum 20 from each of the paper feeding paths D1, D2 or D3 is further guided to a corona discharger 24 for transfer, and the corona discharge of the discharger 24 for transfer is performed. Thereby, the toner image on the surface of the photosensitive drum 20 is transferred to the roll sheet 4. The roll sheet 4 onto which the toner image has been transferred is placed on the peeling corona discharger 2.
5 is separated from the surface of the photosensitive drum 20 by the corona discharge in 5, and further guided to the fixing device 35 through the transport path 34. In the fixing device 35, the toner is fixed on the surface of the roll sheet 4 by heating and pressing the roll sheet 4 between the heat roller 37 and the pressure roller 38. The roll sheet 4 on which the toner has been fixed is discharged from the discharge roller 36 to the outside of the copying machine 1 via the discharge detection switch 55, and is stored in the pocket 92 via the guide member 91 as described above. On the other hand, the toner remaining on the surface of the photosensitive drum 20 after the transfer of the toner image is removed by the cleaning device 26, and the preparation for forming the next electrostatic latent image is made. The toner image is similarly transferred and fixed to the cut sheet 4 </ b> D guided to the photosensitive drum 20 from the bypass paper feed path D <b> 4, and is discharged to the pocket 92.

A guide auxiliary plate 94 is arranged above the guide member 91. This guide auxiliary plate 94
Is a stay 9 attached to the front surface 1a of the copying machine body 1.
The guide member 91 is rotatably supported by the guide member 5 and guides the roll sheet 4 hanging down in front of the guide member 91 and discharged to the pocket 92 together with the guide member 91 (indicated by a dashed line in FIG. 1). ) And the storage position held by the stay 95 (shown by a solid line in FIG. 1).
And can be displaced.

An image forming section is constituted by the photosensitive drum 20, developing device 22, transfer corona discharger 24 and the like. In the present embodiment, a main motor MM for driving the image forming unit and a paper feed motor D for driving a roller group for feeding each of the sheets 4A to 4D.
M, and a fixing motor FM as a driving unit for driving the heat roller 37, the pressure roller 38, and the like of the fixing device 35.
And a document feed motor OM for driving the document transport unit 10.

Next, FIGS. 4 (a) and 4 (b) are schematic side views of a paper feed unit as a roll sheet transport mechanism which is a feature of the present embodiment, and FIGS. 5 and 5 are schematic side views of the paper feed unit. FIG. 6 is an exploded perspective view of a main part of the paper feeding unit.
, The paper feed unit will be described based on the lower roll sheet 4C. This paper feed unit U is shown in FIG.
And the entire paper feeding unit U can be pulled out in front of the copier main body 1 (right side in FIG. 1 and X direction in FIG. 5). The roll body 4C1 of the roll sheet 4C is set in the pulled-out state.

Referring to FIGS. 4A and 4B and FIG.
401 is a base plate, 402 is an outer guide plate forming the rear surface of the sheet feeding unit U, and 403 is opposed to the outer guide plate 402 and between the outer guide plate 402 and
An inner guide plate that partitions a part of the third paper feed path D3. These guide plates 402 and 403 are made of a conductive metal member.

The outer guide plate 402 is connected to the paper feed roller 65.
A portion D31 extending upward from the third paper feed path D3 is defined above the positions a and 65b. As shown in FIG. 6, the inner guide plate 403 has a substantially angled shape, has an upper extension 408 at the upper end of the main body 407, and a lower extension extending obliquely downward at a part of the lower end. 409. A lower end 411 of the elastic thin plate 410 is attached and fixed near the lower end of the main body 407.
As shown in FIGS. 4 (a) and 4 (b), the elastic thin plate 410 narrows the space between the elastic thin plate 410 and the outer guide plate 402 as it goes upward.
2 is elastically pressed and urged. This elastic thin plate 410
4B between the upper end 412 and the outer guide plate 402.
As shown in (2), the leading end 4C2 of the roll sheet 4C is pinched and held.

As the material of the elastic thin plate 410, it is preferable to use a synthetic resin film, for example, a PET film. In particular, it is preferable to use a conductive material in which carbon powder or the like is mixed as a conductive material in a resin, since the adsorbed charge of the conveyed roll sheet 4C can be removed.
The thickness of the film is set so that the elastic thin plate 410 attached in a cantilever state has a predetermined bending rigidity. Here, the predetermined bending rigidity is defined as the roll sheet 4C.
The resilient repulsive force that can hold the leading end 4C2 of the roll sheet 4 at the set position can be generated, and the bending rigidity is such that the conveyance of the roll sheet 4C is allowed.

One of the paper feed rollers 65b is connected to the axis 4
It is rotatably supported by a rotation support plate 405 that is rotatable about 06. This rotation support plate 405 is
As shown in FIG. 4B, the paper feed rollers 65a and 65b are set in a state where they are brought into contact with each other. In this state, a force for urging the paper supply roller 65b toward the paper supply roller 65a is obtained by the weight of the rotation support plate 405 and the paper supply roller 65b due to the sitting relationship. Further, the rotation support plate 405 is engaged with the side plate U1 (see FIG. 5) of the paper feed unit U so as to maintain the posture shown in FIG. 4A, that is, the posture in which the paper feed path is largely opened. (Not shown).

Next, an operation procedure for setting the roll body 4C1 with the roll sheet 4C pulled out by a predetermined amount will be described. First, after opening the front door 1b of the copying machine body 1, the entire unit U shown in FIG. Next, the rotation support plate 405 is rotated to lock in the open position shown in FIG. Next, after the roll body 4C1 is set in a state where the roll sheet 4C is pulled out from the roll body 4C1 by a predetermined amount, as shown in FIG.
Push up along. The end 4C2 of the rolled sheet 4C that has been pushed up is connected to the elastic thin plate 410 and the outer guide plate 4C.
As shown in FIG. 4 (b), they are guided by both of them, and they are introduced between them while pushing and widening the space between them, so that they are sandwiched and held by both. At this point, there is no need to support the leading end 4C2 of the roll sheet 4C with hands, and both hands can be used in subsequent operations.

According to the above embodiment, a new roll body 4
When setting C1 in a predetermined setting state, the leading end 4C2 of the roll sheet 4C pulled out from the roll body 4C1
Can be held elastically between the elastic thin plate 410 and the outer guide plate 402 at the set position. Therefore, the roll body 4C1 can be easily set in a predetermined setting state, and the operability when replacing the old and new roll bodies 4C1 is remarkably improved. In addition, roll sheet 4C
Since the leading end 4C2 of the roll sheet 4C can be set straight without being inclined, it is possible to prevent the occurrence of a jam due to the oblique conveyance of the roll sheet 4C.

When the roll body 4C1 is set, the leading end 4C2 of the roll sheet 4C pulled out from the roll body 4C1 is merely pushed up from below along the third sheet feeding path D3, and the leading end 4C2 is moved to the outer guide. Guided by the plate 402 and the elastic thin plate 410, the sheet is automatically set at the set position. As a result, the operability when replacing the roll body 4C1 is further improved.

Further, since the elastic thin plate 410 is made conductive, it is possible to remove the adsorbed charges of the roll sheet 4C being conveyed, so that it is possible to reliably prevent the occurrence of a jam caused by static electricity. The middle roll sheet 4B can achieve the same operation and effect with the completely same configuration as the present embodiment.

The present invention is not limited to the above embodiment. For example, the elastic thin plate 410 is
Only, it may be attached to only the inner guide plate 403. Further, as shown in FIG. 7, an elastic thin plate 411 supported by the outer guide plate 402 may be provided, and attached to each of the guide plates 402 and 403. In this case, the leading end 4C2 of the roll sheet 4C is held between the pair of elastic thin plates 410.

Further, as the elastic thin plate 410, one obtained by applying a conductive paint to the surface of a resin film may be employed. In addition, various changes can be made within the scope of the present invention.

[0043]

According to the first aspect of the present invention, when a new roll body is set, the tip of the roll sheet pulled out from the roll body is elastically moved between the elastic thin plate and the guide plate. Since the roll body can be held at the set position while being nipped, the roll body can be easily set. Further, since the leading end of the roll sheet can be set without being inclined, it is possible to prevent the occurrence of a jam due to the oblique conveyance of the roll sheet.

According to the second aspect of the present invention, the leading end of the roll sheet is elastically held between a pair of elastic thin plates supported by each guide plate and held at the set position. The same effect as the invention according to the first aspect is obtained. According to the invention according to claim 3, when a new roll body is set, the leading end of the roll sheet pulled out from the roll body is automatically pushed to the set position only by pushing up from the bottom along the transport path. Can be set. As a result, the operability when replacing the roll body is further improved.

According to the fourth aspect of the invention, the conductive elastic thin plate can remove the adsorbed charge of the conveyed roll sheet, so that it is possible to reliably prevent the occurrence of a jam caused by static electricity.

[Brief description of the drawings]

FIG. 1 is a simplified cross-sectional view showing an internal configuration of a copying machine to which a roll sheet transport mechanism according to an embodiment of the present invention is applied.

FIG. 2 is a perspective view showing an external configuration of the copying machine.

FIG. 3 is a perspective view of the copying machine in use.

FIG. 4 is a schematic side view of a sheet feeding unit, wherein (a),
(B) sequentially shows the procedure for setting the roll sheet.

FIG. 5 is a schematic perspective view of a paper feed unit constituting the roll sheet transport mechanism.

FIG. 6 is an exploded perspective view of a main part of the paper feeding unit.

FIG. 7 is a schematic side view of a main part of a roll sheet transport mechanism according to another embodiment of the present invention.

FIG. 8 is a schematic side view of a conventional roll sheet transport mechanism, and (a) and (b) sequentially show a procedure for setting a roll sheet.

[Explanation of symbols]

 4C Roll sheet 4C1 Roll body 4C2 Tip D3 Third paper feed path D31 Upwardly extending portion 65a, 65b Paper feed roller 402 Outer guide plate (other guide plate) 403 Inner guide plate (one die plate) 410 Elastic thin plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 19/10

Claims (5)

(57) [Claims] 1. A roll body formed by winding a long roll sheet, and a transport path for transporting a roll sheet drawn from the roll body to an image forming unit for recording an image on the roll sheet. And a roller for conveying the roll sheets sandwiched between each other in a pair with the conveyance path interposed therebetween, at least one of which is pressed against the other by a predetermined urging force, and A pair of transport rollers capable of relatively separating each other from each other against the urging force at the time of replacement, wherein the transport path extends upward in the transport direction above the transport rollers. Image forming apparatus having
In location of the roll sheet conveying mechanism, a pair of guide plates in a state of being opposed across a portion extending above Symbol upwardly defining at least part of the conveying path, is supported on one of the guide plates, An elastic thin plate which elastically sandwiches the roll sheet between the roll sheet and the other guide plate ;
With the roll pulled out from the roll for a predetermined length,
Set upward at the set position set in the part that extends
Is, the elastic repulsive force of the elastic sheet may only push up from below the leading edge of the roll sheet when replacing the roll sheet, to hold it by introducing a leading end of the roll sheet between the other guide plates to the set position A roll sheet transport mechanism for the image forming apparatus, which is set so as to allow transport of the roll sheet during transport. 2. The roll sheet transport mechanism according to claim 1, further comprising an elastic thin plate supported by said other guide plate, wherein a tip of said roll sheet is sandwiched between said elastic thin plates. A roll sheet transport mechanism for an image forming apparatus, wherein the roll sheet transport mechanism is held at the set position. 3. The roll sheet conveying mechanism of an image forming apparatus according to claim 1, wherein the elastic thin plate is provided on each guide plate so as to narrow a width of an upwardly extending portion of the conveying path as going upward. A roll sheet transport mechanism for an image forming apparatus, wherein the roll sheet transport mechanism is inclined with respect to the image forming apparatus. 4. The roll sheet transport mechanism of an image forming apparatus according to claim 1, wherein said elastic thin plate contains a conductive material for removing an adsorbed charge of a roll sheet passing therethrough. Roll sheet transport mechanism of image forming apparatus. 5. An image form according to claim 1, wherein :
In the roll sheet transport mechanism of the forming apparatus, the elastic thin plate
Is continuous over the entire width of the corresponding guide plate.
A roll of an image forming apparatus,
Transport mechanism.