JP3532764B2 - Paper transport mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying mechanism that is provided in, for example, a large electrophotographic apparatus and that conveys a sheet between a roller that is driven and rotated and a roller that is driven and rotated accordingly.

[0002]

2. Description of the Related Art Conventionally, there has been a large electrophotographic apparatus for transferring a continuous continuous sheet of paper connected at perforations and the like, and this type of electrophotographic apparatus has been required in recent years for higher speed. In response, the transfer processing speed as well as the paper transport speed have been increased. For example, there is also an electrophotographic apparatus in which the sheet conveying speed is set to several hundreds to several tens of thousands lines / min.

In such an electrophotographic apparatus, a sheet-conveying mechanism including rollers is employed to convey continuous sheets. The sheet-conveying mechanism is provided between a roller that is driven to rotate and a roller that is driven to rotate with the roller. It is configured to be conveyed with the continuous paper sandwiched therebetween. In this type of paper transport mechanism, the roller that is driven and rotated is a scuff roller,
A roller that is driven to rotate with it is called a pinch roller.If both rollers are scuff rollers, it is not possible to evenly convey the continuous paper and the continuous paper skews. The rollers are simply rotatable pinch rollers.

FIG. 7 is a schematic plan view showing a part of the structure of a conventional paper conveying mechanism, and FIG. 8 is a cutaway sectional view showing a part of FIG. 7 in an enlarged manner. As described above, in the conventional paper transport mechanism, the scuff roller 10 is provided with the width direction W of the continuous paper B as the axial direction, and the plurality of pinch rollers 11 are arranged along the axial direction of the scuff roller 10. There is. Each of these pinch rollers 11 is pressed against the scuff roller 10 and is driven to rotate. Also, each pinch roller 11
Each pair of two adjacent rods is fitted into each pin rod 12 whose axial direction coincides with the column direction, and each pin rod 12 is not shown in a state of being axially supported by the arm member 13. It is urged toward the scuff roller 10 side via a pressure contact spring. Although the detailed structure of the arm member 13 is not shown, the arm member 13 is supported by the sheet metal member 14 in a state of being biased by the pressure contact spring, and each pinch roller 11 has a plurality of openings 14 a formed in the sheet metal member 14. It is supposed to face the Scuff Flora 10 side. Further, one groove 12a for positioning each pinch roller 11 is formed on the outer periphery near the tip of each pin rod 12.

In the sheet conveying mechanism having such a structure, when the continuous sheet B having the width W3 is conveyed at high speed, the continuous sheet B is conveyed between the scuff roller 10 and each pinch roller 11. Each pinch roller 11
Are positioned facing each other at predetermined intervals over the entire width dimension W3 of the continuous paper B, and therefore the continuous paper B is conveyed in a state of being pressed against the scuff roller 10 and each pinch roller 11 over the entire width direction W. .

[0006]

However, in the above-described conventional paper conveying mechanism, when the continuous paper B having the width dimension W3 is conveyed as shown in FIGS. 7 and 8, the continuous paper B in the width direction W is conveyed. The pinch roller 11 facing the end portion is
When the continuous paper B having the width dimension W4 is conveyed, the end portion in the width direction W is surely pressed into contact with the width direction W of the continuous paper B.
The pinch roller 11 protrudes from the position facing the end. That is, depending on the width of the paper, the widthwise end W of the continuous paper B is not sandwiched between the pinch roller 11 and the scuff roller 10, and the continuous paper B is conveyed at high speed in such a state. And the width direction W
Sagging or flapping occurs at the edges. As a result, there is a problem in that the conveyance posture of the continuous paper B is disturbed, and paper jams and skewing, which are obstacles at the time of paper conveyance, occur.

The present invention has been devised under the circumstances described above, and it is possible to reliably press the widthwise end portion of a sheet by a pinch roller according to the sheet width dimension, which causes an obstacle during sheet conveyance. It is an object of the present invention to provide a paper transport mechanism capable of effectively preventing various paper jams and skews corresponding to various paper sizes.

[0008]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention takes the following technical means.

That is, the sheet conveying mechanism provided by the present invention is opened at a predetermined pitch at both ends in the width direction.
To convey continuous paper with multiple punctured holes
In the paper transport mechanism, tiger having a pawl which moves cyclically
The width of the continuous paper.
Adjusting according to the size, bite the nail into the feed holes
A tractor that conveys the continuous paper by combining them
And on the downstream side in the continuous paper transport direction with respect to the tractor.
The scuff roller that is installed and driven to rotate, and the continuous
The paper is driven to rotate while being pressed against the scuff roller.
A pinch roller that conveys the continuous paper by
The pinch roller is linked with the position adjustment of the tractor.
And a connecting member for displacing the continuous paper at the end portion .

In addition, in the paper transport mechanism,
A plurality of punch rollers are provided along the width direction of continuous paper.
Together with the position adjustment of the tractor, the plurality of
The position of the pinch roller may be displaced.

According to the paper conveying mechanism of the present invention,
Continued paper is conveyed while being pulled by the tractor,
The position of the tractor is also adjusted according to the width of the continuous paper.
However, at this time, the pinch roller also connects the continuous paper by the connecting member.
Since it is displaced to the edge of the
Position of the pinch roller just by adjusting the position of the tractor
Can also be adjusted automatically. Therefore, even if continuous paper is conveyed at high speed, the widthwise end of the continuous paper does not sag or flutter, and paper jams, skews, etc. that interfere with paper conveyance can be handled for various paper sizes. Can be effectively prevented.

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of an electrophotographic apparatus to which the present invention is applied. An electrophotographic apparatus A shown in this figure is an apparatus for performing a transfer process on a continuous sheet B which is conveyed at high speed by an electrophotographic method, and a conveyance path of the continuous sheet B includes a supply section R1, a tractor section R2, Transfer portion R3, suction feeder portion R4, fixing portion R5, roller feeding portion R6, swing portion R7, and stacker portion R
It is formed in the order of 8. On such a transport path, the sheet transport mechanism C corresponding to the invention of the present application is provided in the roller feed section R6.

The continuous paper B is a series of recording papers connected along the perforation B1 in the width direction W, as shown in FIG. Feed holes B4 are formed in a peripheral portion along both end portions B2 and B3 of W at a predetermined pitch. Such continuous paper B can be folded in a bellows shape along the perforations B1.

The supply section R1 is provided with continuous paper B before being conveyed in a state of being folded along the perforations B1, and the continuous paper B is stretched from the folded state inside the apparatus. Will be drawn to.

In the tractor section R2, tractors R2a for conveying the continuous paper B in a state of being pulled are arranged in parallel in the width direction.
These two tractors R2a are provided as a base and convey the continuous paper B by interlocking the claws that cyclically move in the feed holes B4 of the continuous paper B. Here, although only one tractor R2a is shown in the drawing, two tractors R2a are overlapped in the direction perpendicular to the drawing.
Are arranged. Further, the two tractors R2a arranged side by side in the width direction of the continuous paper B are arranged such that the distance between the two tractors R2a in parallel with each other can be adjusted according to the width dimension of the continuous paper B. The parallel spacing of the tractors R2a is adjusted so that the pawls are engaged with the feed holes B4 when the tractor R2a is set along the transport path. The tractor R2a will be described in detail in another embodiment described later.

The transfer portion R3 is provided with a photosensitive drum R3a and the like, and toner transfer is performed by an electrophotographic method with the continuous paper B in close contact with the photosensitive drum R3a. The electrophotographic transfer process is the same as the conventionally known process, and thus detailed description thereof is omitted.

The suction feeder R4 is provided with a suction mechanism R4a, and the continuous paper b passes by the suction mechanism R4a while being sucked toward the road surface side of the transport path. The continuous paper B sucked toward the road surface by the suction mechanism R4a is stably transported at high speed without fluttering in the vertical direction on the transport path.

At the fixing section R5, the toner image transferred onto the continuous paper B at the transfer section R3 is fixed by heat.

The roller feed section R6 includes a paper transport mechanism C,
D is arranged forward and backward, and these paper transport mechanisms C,
The continuous paper b is sent from the fixing section R5 to the swing section R7 by the conveying force of D. The paper transport mechanism D is
Although it has the same configuration as the sheet transport mechanism C, it is shown in a simplified manner in the drawings. The paper transport mechanism C will be described in detail later.

The swing unit R7 is provided with a swinging mechanism R7a, and the continuous paper B fed from the roller feeding unit R6 is guided to the stacker unit R8 by being folded again by the swinging mechanism R7a. Get burned.

In the stacker section R8, the continuous paper B guided through the swing mechanism R7a of the swing section R7 is accumulated on the stacker tray R8a in the folded state. The stacker tray R8a can be moved up and down in accordance with the accumulated amount of the continuous paper B and the like.

Next, the paper transporting mechanism C in the roller feeding portion R6 will be described in detail with reference to FIGS. 2 to 4 together with FIG.

FIG. 2 is a perspective view showing the periphery of the sheet conveying mechanism C in the roller feeding section R6, and FIG. 3 is the X shown in FIG.
3 is a plan view showing the paper transport mechanism C from the direction, FIG.
FIG. 3 is a cutaway sectional view showing an enlarged main part shown in FIG. 2 to 4, some members are not shown. Further, the conveyance direction of the continuous paper B is indicated by reference sign FW.

As shown in FIGS. 1 to 4, the sheet conveying mechanism C is roughly constituted by a scuff roller C1, a pinch roller C2, a pin rod C3, an arm member C4, a pressure contact spring C5, and a sheet metal member C6. There is.

The scuff roller C1 is a cylindrical roller made of stainless steel or the like, and drives and rotates with the width direction W of the continuous paper B on the conveying path as the axial direction, as shown in FIG. The scuff roller C1 is formed to be slightly longer than the width dimension W1 of the continuous paper B, and the roller surface C1a is in contact with the entire width of the continuous paper B. Such a scuff roller C1 is incorporated in the roller feed portion R6 so as to be driven and rotated by a motor or a drive belt (not shown).

The pinch roller C2 is a small roller made of a plastic molding or the like, and a plurality of pinch rollers C2 are arranged along the axial direction of the scuff roller C1 as shown in FIGS. 2 and 3 in particular. The pinch roller row is formed in this state. Further, as shown in FIG. 4, each pinch roller C2 is in a state of being fitted to the pin rod C3 via the boss portion C2a, and is freely rotatable with respect to the pin rod C3. Furthermore, each pinch roller C
Reference numeral 2 is in a state of being in pressure contact with the roller surface C1a of the scuff roller C1 and is driven to rotate as the scuff roller C1 rotates. The continuous paper B is transported along the transport direction FW while being sandwiched between the scuff roller C1 and each pinch roller C2. Each such pinch roller C
2 can be independently moved in the width direction W of the continuous paper B.

Explaining in more detail the essential points, each pinch roller C2 is free to rotate with respect to each pin rod C3 whose axial direction coincides with the width direction W of the continuous paper B for each set of two adjacent pairs. Fitting is possible. Further, as shown in FIG. 3, each pinch roller C2 is in a position facing the scuff roller C1 side through an opening C6a opened in the sheet metal member C6. As shown in FIG. 2, each pin rod C3 is urged toward the scuff roller C1 side via a pressure contact spring C5 while being axially supported by the tip end of each arm member C4, and is adjacent to each other. A predetermined interval is provided for each pin rod C3. As shown in FIG. 4 in particular, the pinch rollers C are formed on the outer periphery of both ends of each pin rod C3.
A plurality of positioning grooves C3a to C3c for displacing the sheet 2 in the width direction W of the continuous paper B and fixing it are formed.
On the other hand, the boss C2a of each pinch roller C2 is formed with a plurality of locking arms C2b extending in the axial direction, and an inward projection is formed at the tip of the locking arm C2b. ing. Therefore, each of the pinch rollers C2 elastically deforms the plurality of locking arms C2b, and at the same time, the inward projections thereof have appropriate positioning grooves C3a to C3c.
When it is engaged with, it is positioned at a predetermined position in the column direction. Further, the pressure contact spring C5 is interposed between the base end portion C4a of the arm member C4 and the sheet metal member C6, and the arm member C4 is swingable in a state of being attached to the sheet metal member C6. The pinch roller C2 and its peripheral members C3 to C5 are assembled in a state of being integrated with the sheet metal member C6, and the roller feed portion R6.
When setting the continuous paper B along the transport path at
The entire sheet metal member C6 is retracted from the transport path while being lifted above the scuff roller C1.

When the continuous sheet B is conveyed at high speed by the sheet conveying mechanism C having the above structure, the scuff roller C1
Is rotated at high speed, and the continuous paper B is sandwiched between the scuff roller C1 and each pinch roller C2.

In such a state, since the pinch rollers C2 are arranged in a state in which the entire width direction W of the continuous paper B is uniformly in pressure contact with the continuous paper B, the continuous paper B has the scuff roller C1 and the pinch rollers C1. It is stably transported to C2 without disturbing the transportation posture.

At this time, both ends B of the continuous paper B in the width direction W
2 and B3, as shown in FIGS. 3 and 4, for example, the width direction W one end portion B2 of the continuous paper B is
It is possible to move as a passing line at a fixed position on the transport route. That is, one pinch roller C2 located on the outermost side (right end in the drawing) of the pinch roller row is the continuous paper B.
It is located at a position where it reliably contacts the one end portion B2 in the width direction W, and the one end portion B2 is reliably pressed with a sufficient pressing margin.

On the other hand, the other end B3a in the width direction W of the continuous paper B having the width dimension W1 moves as the passage line at the position indicated by the broken line in the drawing, and therefore the outermost side of the pinch roller row (in the drawing, the line). It can be said that the one pinch roller C2 located at the left end) is in a state of reliably pressing the other end B3a with a sufficient pressing margin at a position in contact with the other end B3a.

That is, when the continuous paper B having the width W1 is conveyed at a high speed in the conveying direction FW, both end portions B2 and B3a of the width direction W are the pinch rollers C2 located near both ends of the pinch roller row. Since the state of being reliably sandwiched between the scuff roller C1 and the scuff roller C1, the slack and flapping of the end portion of the sheet, which is an obstacle during high-speed conveyance, does not occur.

On the other hand, as shown in FIGS. 3 and 4 again, in the case of the continuous paper B having the width W2 slightly larger than the width W1, the width direction W one end portion B2 thereof has the width W1. Similarly to the case of, the pinch roller C2 is in pressure contact, but on the other hand, the other end B2b in the width direction W is
The situation is such that the vehicle moves while protruding from the pinch roller C2.

In such a case, if the continuous paper B is conveyed at a high speed as it is, obstacles such as slack and flapping occur at the other end B2b in the width direction W which is not restricted by anything. Pinch roller C2 to continuous paper B
Such obstacles can be dealt with by displacing in the width direction W of.

That is, in order to displace the pinch roller C2, each locking arm C2b is elastically deformed in the outer diameter direction from the state shown in FIG. 4, and the locking arms C2b are moved.
The pinch roller C2 may be slid along the pin rod C3 so that the inward projection formed at the tip of the pin is engaged with the positioning groove C3b or C3c different from the currently positioned positioning groove C3a. .

Then, the pinch roller C2 is positioned at a position where the other end B2b of the continuous paper B in the width direction W is surely pressed against the continuous paper B, and the continuous paper B having a large width dimension.
Even if the paper is conveyed at high speed, the pinch roller C
If 2 is adjusted in the column direction to cope with the problem, slack or fluttering of the edge of the sheet, which would be an obstacle during high-speed conveyance, will not occur.

When the width of the continuous paper B is extremely small, the middle pinch roller C2 in the pinch roller row is moved in the width direction W through the locking arm C2b and the positioning grooves C3a to C3c as described above. By adjusting the width of the continuous paper B having a small width, the paper edge can be reliably sandwiched between the pinch roller C2 and the scuff roller C1.

Therefore, according to the sheet conveying mechanism C of this embodiment, the pinch roller C2 is provided so as to provide a sufficient pressing margin for the widthwise end portions W2 and B3 of the continuous sheet B.
Can be adjusted by shifting in the width direction W, so that the width direction W ends B2 and B3 of the continuous paper B are pinched by the pinch roller C2.
And the scuff roller C1 are reliably pressed against each other, and even if the continuous paper B is conveyed at a high speed, the widthwise end portions B2 and B3 of the continuous paper B do not sag or flap. It is possible to effectively prevent paper jams, skews, and the like, which are obstacles when the paper is conveyed, in correspondence with various paper sizes.

Next, another embodiment of the sheet conveying mechanism according to the present invention will be described with reference to FIG.

FIG. 5 is a schematic explanatory view showing another embodiment of the paper carrying mechanism according to the present invention. The paper carrying mechanism E shown in this figure is the paper carrying mechanism C described in the previous embodiment. Instead of this, it is provided in the electrophotographic apparatus A of FIG. The sheet conveying mechanism E is configured to interlock with the tractor R2a shown in FIG. 1, and other members in the electrophotographic apparatus A are similar to those shown in FIG. The description is omitted. Hereinafter, the tractor R2a and the sheet transport mechanism E will be described in detail.

As described in the previous embodiment, two tractors R2a are provided in parallel in the width direction W of the continuous paper, and in FIG. 5, in order to distinguish the two tractors, Along the widthwise direction W, the right tractor is indicated by the reference symbol R2a, and the left tractor is indicated by R2b. The left tractor R2b cannot be adjusted while being fixed to the fixed shaft R2c, but the right tractor R2a is adjustable along the fixed shaft R2c according to the width dimension of the continuous paper. In both of these tractors R2a and R2b,
When the continuous paper is conveyed, the belt R2d is circulated and rotated by a motor (not shown) or the like, and a large number of claws R2e formed on the belt R2d at a predetermined pitch engage with the feed holes of the continuous paper. That is, one tractor R2a is
It is adjusted to a position where it meshes with the feed hole according to the width dimension of the continuous paper to be conveyed. This kind of adjustment work is done with the adjustment knob R
It is done manually using 2f.

The paper transport mechanism E is composed of a scuff roller E1,
Pinch roller E2, long shaft rod E3, and buffer spring E
4 is provided and is roughly configured. The scuff roller E1 is the same as the scuff roller C1 described in the above embodiment, and thus detailed description thereof is omitted.

The pinch roller E2 has substantially the same form as the pinch roller C2 described in the above embodiment, but differs in the mounting structure and the like. That is, the pinch rollers E2 form a pinch roller row in a state in which a plurality of pinch rollers E2 are aligned along the scuff roller E1. Each pinch roller E2 has a long axis rod whose axial direction is the width direction W. It is fitted to E3 so as to be freely rotatable. The pinch roller E2a located at the leftmost end in FIG. 5 is fixed to the long rod E3. A plurality of buffer springs E4, which apply a compressive deformation force to each pinch roller E2, are interposed between adjacent pinch rollers E2 in the long-axis rod E3 while being compressed and deformed via washers (not shown). There is. The pinch roller E2b located at the rightmost end in such a pinch roller row is interlocked with the right tractor R2a via the connecting member E5. Moreover, the pinch roller E2b is in a position where it reliably contacts the one end of the continuous paper in the width direction W due to the mutual positional relationship with the tractor R2a, and it is possible to reliably press the one end with a sufficient pressing margin. Has been done. The connecting member E
One end E5a of 5 is connected to a non-movable part integrated with the tractor R2a and the other end E5b.
Is in contact with the side surface of the pinch roller E2b.

In other words, each pinch roller E2 is restrained at a predetermined position while being elastically balanced along the axial direction via the buffer spring E4 which is elastically deformed to be adjacent to each other and intervenes. Can be said. The pinch rollers E2 thus aligned are in a state in which they are kept at a uniform interval from each other, and from such a state, the pinch roller E2b at the right end.
When is pressed by the connecting member E5 to the left as the tractor R2a is adjusted, the buffer springs E4 are further compressed and deformed. As a result, the interval between the pinch rollers E2 is narrowed, and the plurality of pinch rollers E2 are in a state of contracting and shifting in the column direction while maintaining a uniform interval in proportion.
Conversely, when the pressing force on the right end pinch roller E2b is weakened from such a state, each pinch roller E2
The buffer springs E4 are pushed back by the compressive deformation force of the buffer springs E4, so that the distance between them is increased and the expanded springs are maintained in the column direction. The pinch rollers E2 aligned in the row direction while being elastically maintained in this way are evenly distributed over the entire width of the paper when the tractor R2a is adjusted according to continuous paper having various width sizes. It will change while maintaining the aligned state. Therefore, the continuous paper is reliably sandwiched between the scuff roller E1 and each pinch roller E2, and is stably transported without disturbing the transport attitude.

Tractors R2a and R2 having the above structure
A case of adjusting and adjusting b and the sheet conveying mechanism E along the width direction W will be described with reference to FIG.

In the state shown in FIG. 5, when the right tractor R2a is adjusted to the left along the width direction W in accordance with the width dimension of the continuous paper, the pinch roller E2b located at the right end is also adjusted to the left. The Rukoto.

At this time, since the right end pinch roller E2b is urged by the connecting member E5 with a larger pressing force, the respective pinch rollers E2 of the long rod E3 are provided with the buffer springs E4 which are interposed in the adjacent intervals. Due to the compressive deformation force of, the particles are reduced in the column direction and aligned at uniform intervals.

In this way, when the width of the continuous paper is small, the tractor R2a can be adjusted leftward along the widthwise direction W to move the pinch roller E2 to an appropriate position with respect to the edge of the paper. It can be changed and adjusted.

On the contrary, when the width of the continuous paper is large, the tractor R2a may be adjusted to the right. Even in such a case, the pinch roller E2b is displaced to an appropriate position with respect to the widthwise end W of the continuous paper.

In any case, the plurality of pinch rollers E2
Is in a state of being aligned while maintaining a uniform interval over the entire width direction W of the continuous paper.
The whole is conveyed in a state of being pressed uniformly by the pinch roller E2.

Therefore, even with the paper transport mechanism E and the tractors R2a and R2b, both ends of the continuous paper in the width direction W do not sag or flap like the effect of the previous embodiment, and there are obstacles during paper transport. It is possible to effectively prevent paper jams, skews, and the like that are associated with various paper sizes.

Moreover, the pinch roller E2 is adjusted by adjusting the tractors R2a and R2b only by adjusting the parallel spacing of the tractors R2a and R2b according to the width dimension of the continuous paper.
Can also be adjusted automatically, Scuff Flora E1
It is possible to stably convey the continuous paper while keeping the entire paper width uniformly pressed between the pinch roller and the pinch roller.

In the other embodiment, the pinch roller E2 is automatically adjusted when the tractor R2a is manually adjusted. However, as shown in FIG. The pinch roller E2 may be automatically adjusted / adjusted based on the sheet width dimension set and input to the control device G. When such automatic control is adopted, the control device G is provided with a key switch G1 for setting and inputting the paper width dimension and a display panel G2 for displaying the paper width dimension. The pinch roller E2 is directly controlled by the control device G, and is displaced in a predetermined direction by, for example, an actuator mechanism. For example, when the paper width dimension is set large, the pinch roller E2 moves in the "UP" direction shown in FIG. 6, and conversely, when the paper width dimension is set small, the pinch roller E2 moves in the "DOWN" direction. It will be.

In this way, if it is only necessary to set and input the paper width dimension to the control device G, the adjustment work of the pinch roller E2, which is required according to various paper sizes, can be easily performed. You can

Further, in the other embodiment described above, FIG.
As shown in FIG. 7, the buffer spring E4 is interposed between all the adjacent pinch rollers E2.
Instead of 4, a collar member may be partially provided to close the adjacent space. Even when such a collar member is provided, the size of the entire pinch roller row can be changed by reducing or expanding the interval in which the buffer spring E4 is interposed.

Further, in each of the above embodiments, the continuous paper B is conveyed at high speed by the paper conveying mechanisms C and E, but recording paper such as cut paper may be conveyed one by one.

Further, in each of the above-mentioned embodiments, the sheet conveying mechanisms C and E are applied to the electrophotographic apparatus A, but of course, it is applicable to an apparatus for conveying other sheets. For example, application to a small-sized printer device used as an output device of a personal computer or the like can be considered.

[0072]

As is apparent from the above description, according to the present invention, the position of the tractor is adjusted according to the width of the continuous paper.
When the pin is adjusted, the pinch roller is also connected for continuous use.
It wants to convey Runode is displaced to the end of the paper, the continuous paper
You can also adjust the pinch rollers by simply adjusting the position of the lacquer.
It can be done dynamically. Therefore, even if the paper is conveyed at a high speed, the pinch roller can be moved to an appropriate pressing position for the paper to be adjusted, so that the widthwise end of the paper does not sag or flutter. It is possible to effectively prevent paper jams, skews, and the like, which are obstacles when the paper is conveyed, in correspondence with various paper sizes.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of an electrophotographic apparatus to which the present invention is applied.

FIG. 2 is a perspective view showing the periphery of a sheet conveying mechanism in the roller feeding section of FIG.

FIG. 3 is a plan view showing a paper transport mechanism from the X direction shown in FIG.

FIG. 4 is a cutaway sectional view of an essential part showing an enlarged part of the essential part shown in FIG. 3;

FIG. 5 is a schematic explanatory view showing another embodiment of the paper transport mechanism according to the present invention.

FIG. 6 is a schematic explanatory view showing another form of the other embodiment of the paper transport mechanism shown in FIG.

FIG. 7 is a schematic plan view showing a partial configuration of a conventional paper transport mechanism.

FIG. 8 is a cutaway sectional view showing a part of FIG. 7 in an enlarged manner.

[Explanation of symbols]

A Electrophotographic device B continuous paper C Paper transport mechanism C1 Scuff Flora C2 pinch roller C2a boss C2b locking arm C3 pin rod C3a to C3c Positioning groove C4 arm member C5 pressure contact spring C6 sheet metal member E Paper transport mechanism E1 Scuff Flora E2 pinch roller E3 long axis rod E4 buffer spring R2a, R2b tractor G control device

Continuation of the front page (56) Reference JP-A-8-26541 (JP, A) JP-A-8-217301 (JP, A) JP-A-6-211377 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) B65H 20/02 B41J 15/04 B65H 27/00 G03G 15/00 510

Claims (2)

(57) [Claims] 1. A predetermined pitch is provided at both ends in the width direction.
Conveying continuous paper with multiple perforations opened
Is a tractor with a pawl that circulates in a paper transport mechanism for
The position of the printer according to the width of the continuous paper
By engaging the nail with the plurality of feed holes,
A tractor that conveys the continuous paper and a downstream side in the continuous paper conveyance direction with respect to the tractor.
And the scuff roller, which is driven to rotate, and the continuous paper while being pressed against the scuff roller.
A pinchro that conveys the continuous paper by rotating dynamically.
And over La, the pinch roller in conjunction with the adjustment of the position of the tractor
A sheet conveying mechanism, comprising: a connecting member for displacing to the end of the continuous sheet . 2. The pinch roller in the width direction of continuous paper
A plurality of tractors are installed along the
Displace the positions of the pinch rollers in conjunction with the nodes.
Characterized Rukoto, paper transport mechanism of claim 1.