JP2020117375A - Web conveyance device - Google Patents

Abstract

To easily perform web drawing work while preventing slipping when conveying a web.SOLUTION: A device comprises: a drive roller 44a for conveying a long web W as a printing medium by rotating and driving by motive power transmitted from a conveyance motor 62; and a movable roller 61 provided displaceable between a conveyance position where winding angles of the web W with respect to the drive roller 44a when the web W is conveyed by the drive roller 44a are defined as first winding angles, and a low load position defined as second winding angles smaller than the first winding angles.SELECTED DRAWING: Figure 2

Description

The present invention relates to a web transport device that facilitates a web pulling operation while preventing slippage during web transport.

2. Description of the Related Art There is known a web printing apparatus that conveys a web wound in a roll as a print medium and continuously prints images on the conveyed web based on image data included in a print job.

For example, in Patent Document 1, the first wrap angle of the first transport roller is set to 75° or more and is larger than the second wrap angle of the second transport roller, and the second wrap angle of the second transport roller is set to be larger than the second wrap angle. A technique related to an inkjet printing apparatus that suppresses slippage of the continuous paper WP on the first transport roller by reducing the wrapping angle is disclosed.

JP, 2016-43482, A

In the web printing apparatus, when replacing a web wound in a roll shape, an operator pulls the web from a new roll and carries out a web drawing operation of setting the web on a conveying roller.

The transport roller includes a drive roller that is rotationally driven by a motor and a driven roller that is rotatably provided and guides the web.

The drive roller is surface-treated so as to have a large friction coefficient in order to prevent slippage during web conveyance. Then, as in the ink jet printing apparatus disclosed in Patent Document 1, the wrap angle is increased to prevent slippage during web conveyance. Further, unlike the driven roller, the drive roller is connected to the motor via the power transmission mechanism, and the load torque of the motor is applied to the drive roller except when the motor is driven, and it is difficult to rotate.

However, when performing the web pulling work for setting the web on the transport roller as described above, the drive roller is difficult to rotate due to the load torque of the motor and the web is difficult to slip, so it is difficult to set on the drive roller, which is troublesome. It was

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a web transport device that facilitates a web routing operation while preventing slippage during web transport.

In order to achieve the above object, the features of the web transfer device according to the present invention are:
A drive roller that conveys a long web as a print medium by being rotationally driven by the power transmitted from the drive unit,
A first position at which a wrap angle of the print medium with respect to the drive roller when the print medium is conveyed by the drive roller is a first wrap angle, and a second wrap angle smaller than the first wrap angle. And a movable roller provided so as to be movable between the second position and
Is equipped with.

According to the features of the web carrying device of the present invention, it is possible to facilitate the web pulling operation while preventing slippage during web carrying.

1 is a schematic configuration diagram of a printing system including a web printing apparatus according to a first embodiment of the present invention. FIG. 6 is an explanatory diagram illustrating an operation of a movable roller included in the web printing apparatus according to the first embodiment of the present invention. FIG. 2A shows a state where the movable roller 61 is in the transport position, and FIG. 2B shows a state where the movable roller 61 is in the low load position. FIG. 3 is an explanatory diagram illustrating movement of a movable roller included in the web printing apparatus according to the first embodiment of the present invention. (A) shows a state where the movable roller has moved to a position above the drive roller as a low load position, and (b) shows a state where the movable roller has moved to a position below the drive roller as a low load position. Is shown. It is explanatory drawing explaining operation|movement of the movable roller and nip roller with which the web printing apparatus which concerns on 2nd Embodiment of this invention is equipped. FIG. 4A shows a state in which the movable roller is in the transport position, and FIG. 4B shows a state in which the movable roller is in the low load position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Throughout the drawings, the same or equivalent parts or components are designated with the same or equivalent reference numerals. However, it should be noted that the drawings are schematic and different from the actual ones. Further, there are included portions in which dimensional relationships and ratios are different between the drawings.

Further, the embodiments described below exemplify a device or the like for embodying the technical idea of the present invention, and the technical idea of the present invention is that the arrangement of each component is as follows. Not specified in. The technical idea of the present invention can be modified in various ways within the scope of claims.

<First Embodiment>
FIG. 1 is a schematic configuration diagram of a printing system including a web printing device to which a web transport device according to a first embodiment of the present invention is applied. In the following description, the direction orthogonal to the paper surface of FIG. 1 is the front-back direction and the paper surface front direction is the front. Further, the up, down, left and right of the paper surface in FIG. 1 are defined as up, down, left and right directions.

As shown in FIG. 1, the printing system 1 according to the first embodiment of the present invention includes a unwinding device 2, a web printing device 3, and a winding device 4.

The unwinding device 2 includes a web roll supporting shaft 11, and unwinds a web W, which is a long-sized printing medium made of a film, paper, or the like, wound on the web roll supporting shaft 11, to the web printing device 3.

The web roll support shaft 11 rotatably supports the web roll 16. The web roll support shaft 11 is formed in a long shape extending in the front-rear direction. The web roll 16 is a roll of the web W.

The winding device 4 includes a winding shaft 101, and winds the web W printed by the web printing device 3.

The winding shaft 101 winds and holds the web W. The winding shaft 101 is formed in an elongated shape extending in the front-rear direction.

The web printing device 3 conveys the web W unwound from the unwinding device 2 and prints an image on the web W based on a print job. The web printing device 3 includes a housing 21, a transport unit 22, a first printing unit 23, a second printing unit 24, and a printing device control unit 25.

The housing 21 houses each part of the web printing apparatus 3.

The transport unit 22 transports the web W unwound from the unwinding device 2. The transport unit 22 includes guide rollers 31 to 40, 20 head lower support members 41, a meandering roller 42, a transport roller 44, a movable roller 61, and a transport motor 62.

The guide rollers 31 to 40 guide the web W conveyed in the housing 21. The guide rollers 31 to 40, the head lower support member 41, the meandering roller 42, the transport roller 44, and the movable roller 61 form a transport path of the web W in the housing 21. The guide rollers 31 to 40 are rotatably provided and are driven to rotate by the conveyed web W. The guide rollers 31 to 40 are formed in a long shape extending in the front-rear direction.

The guide rollers 31 and 32 guide the web W between the unwinding device 2 and a meandering roller 42 described later. The guide roller 31 is arranged near the left side surface of the housing 21 in the lower part of the web printing device 3. The guide roller 32 is arranged between the guide roller 31 and the meandering roller 42.

The guide rollers 33 to 39 guide the web W. The guide roller 33 is arranged to the left of the meandering roller 42. The guide roller 34 is arranged above the guide roller 33. The guide roller 35 has the same height as the guide roller 34 and is arranged to the right of the guide roller 34. The guide roller 36 is arranged below the guide roller 35 and at a position higher than the guide roller 33. The guide roller 37 is disposed on the left side of the guide roller 36, in the vicinity of the right side of the web W between the guide rollers 33 and 34, and at a position having substantially the same height as the guide roller 36. The guide roller 38 is arranged on the lower right side of the guide roller 37. The guide roller 39 is arranged on the right side of the transport roller 44.

The guide roller 40 guides the web W between the transport roller 44 and the winding device 4. The guide roller 40 is arranged in the lower part of the web printing apparatus 3 near the right side surface of the housing 21.

The head lower support member 41 supports the web W immediately below the first printing unit 23 and immediately below the second printing unit 24. The lower head support member 41 is formed in an elongated shape extending in the front-rear direction. Ten head lower support members 41 are arranged between the guide rollers 34 and 35, which are directly below the first printing unit 23, and between the guide rollers 36 and 37, which are immediately below the second printing unit 24. .. Then, the head lower support member 41 is directly below each printing unit 51 between the guide rollers 34 and 35 which is directly below the first printing unit 23 and between the guide rollers 36 and 37 which is immediately below the second printing unit 24. Two are arranged in each.

In each of the guide rollers 34 and 35 and between the guide rollers 36 and 37, the ten head lower support members 41 are arranged so as to form an upward convex arch. As a result, the web W is stretched between the guide rollers 34 and 35 and between the guide rollers 36 and 37, and is kept in a stable posture.

The meandering roller 42 corrects the meandering of the web W. The meandering roller 42 is formed in an elongated shape extending in the front-rear direction.

The transport roller 44 is arranged at the lower right of the guide roller 38. The transport roller 44 includes a drive roller 44a and a nip roller 44b. The drive roller 44a and the nip roller 44b press the web W (nip) and convey the web W toward the winding device 4. The driving roller 44a and the nip roller 44b are surface-treated so as to have a large friction coefficient in order to prevent slippage when the web W is conveyed.

The carry motor 62 rotationally drives the drive roller 44a.

The movable roller 61 has a conveyance position (first position) at which a wrap angle of the web W with respect to the drive roller 44a when the web W is conveyed by the drive roller 44a is a first wrap angle, and a first wrap angle. It is provided so as to be movable between a low load position (second position) with a small second winding angle. Details will be described later.

The first printing unit 23 prints an image on the front surface of the web W. The first printing unit 23 is arranged above the web W between the guide rollers 34 and 35. The first printing unit 23 includes five printing units 51. The five printing units 51 eject inks of different colors. The printing units 51 have the same configuration except that the color of the ejected ink is different.

The second printing unit 24 prints an image on the back surface of the web W. The second printing unit 24 is arranged above the web W between the guide rollers 36 and 37. The second printing unit 24, like the first printing unit 23, includes five printing units 51 that eject ink of mutually different colors.

The printing device control unit 25 controls the operation of each unit of the web printing device 3. The printer control unit 25 includes a CPU, a RAM, a ROM, a hard disk, and the like.

When performing printing, the printing device control unit 25 causes the drive motor 44 a to be rotationally driven by the transport motor 62 to transport the web W, while ejecting ink from the inkjet heads of the first and second printing units 23 and 24. Then, the image is printed on the web W.

Further, when the printing device control unit 25 receives a stop signal from an operation panel (not shown), the printing device control unit 25 unwinds the web W by the unwinding device 2 and the web W by the transport unit 22 until the end of the print job currently being printed. Of the web W, the winding of the web W by the winding device 4, and the printing by the first and second printing units 23 and 24 are continued.

FIG. 2 is an explanatory diagram illustrating the operation of the movable roller 61 included in the web printing apparatus 3 according to the first embodiment of the present invention. FIG. 2A shows a state where the movable roller 61 is in the transport position, and FIG. 2B shows a state where the movable roller 61 is in the low load position.

When the drive motor 44a is rotationally driven in the direction A by the transport motor 62 to transport the web W, it is possible to prevent the drive roller 44a from slipping by increasing the wrap angle of the web W with respect to the drive roller 44a. Therefore, the wrap angle of the web W with respect to the drive roller 44a when the web W is conveyed by the drive roller 44a is set to the first wrap angle θ1 (about 90°). As a result, the web W is sufficiently wound around the drive roller 44a and gripped, so that the drive roller 44a can be prevented from slipping.

At this time, as shown in FIG. 2A, the movable roller 61 is located above the drive roller 44a, and this position is called the transport position.

On the other hand, when performing the web pulling work for setting the web W on all the transport rollers including the drive roller 44a, the web W is less likely to slip when the wrap angle is large. It takes. Therefore, it is preferable that the winding angle of the web W be made as small as possible when performing the web drawing operation.

Therefore, in order to reduce the winding angle of the web W as much as possible, the movable roller 61 is moved from the transport position to the transport position on the left side of the drive roller 44a, as shown in FIG. 2B.

As a result, the web W is guided by the movable roller 61 and linearly conveyed to the guide roller 39. Therefore, the wrap angle of the web W with respect to the drive roller 44a arranged between the movable roller 61 and the guide roller 39 becomes the second wrap angle θ2 (here, 0°) smaller than the first wrap angle θ1. ..

As a result, the winding angle of the web W can be made as small as possible, so that the web W becomes slippery when performing the web pulling work, and is easily set on the drive roller 44a, and the work becomes easy. The drive roller 44a may or may not rotate during the web drawing operation.

In addition, in the first embodiment of the present invention, when performing the web routing operation, the second winding angle θ2 is changed to a position where the second winding angle θ2 is 0° as a low load position, but the second winding angle θ2 is 0°. However, the angle is not limited to this and may be any angle smaller than the first winding angle θ1.

FIG. 3 is an explanatory diagram illustrating the movement of the movable roller 61 included in the web printing apparatus 3 according to the first embodiment of the present invention. FIG. 3A shows a state in which the movable roller 61 has moved to a position above the drive roller 44a as a low load position, and FIG. 3B shows that the movable roller 61 is in a low load position relative to the drive roller 44a. It shows a state where it has moved to the lower position.

As shown in FIG. 3A, in the state where the movable roller 61 is displaced to a position above the drive roller 44a as the low load position, the second winding angle θ2 is not 0° but about 45°. .. Also in this case, since the second winding angle θ2 (45°) is smaller than the first winding angle θ1 (90°), the frictional force can be reduced, and the web W can be reduced when performing the web routing operation. It becomes slippery, easy to set on the drive roller 44a, and easy to work.

Further, as shown in FIG. 3B, the movable roller 61 may of course move to a position below the drive roller 44a as a low load position. Even in this case, the second winding angle θ2 is 0°, which is smaller than the first winding angle θ1 (90°), so that the frictional force can be reduced and the work can be easily performed on the driving roller 44a. ..

It should be noted that the movable roller 61 is manually moved by the worker so that the movable roller 61 is moved to the transport position when the web W is transported by the drive roller 44a and is shifted to the low load position when performing the web routing work. Good, for example, when the operator presses the "print start button" on the operation panel, it automatically moves to the transport position, and when the "web drawing work" button is pressed, it automatically changes to the low load position. You may

<Second Embodiment>
In the web printing apparatus 3 according to the first embodiment of the present invention, the movable roller 61 shifts to the transport position when the web W is transported by the drive roller 44a, and the movable roller 61 moves to the low load position when performing the web routing work. However, the nip roller 44b may be further displaced.

In the second embodiment of the present invention, the web printing apparatus 3 in which the movable roller 61 and the nip roller 44b are displaced will be described as an example.

FIG. 4 is an explanatory diagram illustrating operations of the movable roller 61 and the nip roller 44b included in the web printing apparatus 3 according to the second embodiment of the present invention.

FIG. 4A shows a state where the movable roller 61 is in the transport position, and FIG. 4B shows a state where the movable roller 61 is in the low load position.

The nip roller 44b is provided so that the rotating shaft 44b1 is guided by the guide rails 63a and 63b and is slidable in the vertical direction. Specifically, it is provided so as to be movable between a pressing position for pressing the web W with the driving roller 44a shown in FIG. 4A and a releasing position for releasing the pressing shown in FIG. 4B. ing.

When the web W is conveyed, the nip roller 44b is moved to the pressing position and presses the web W with the driving roller 44a which is rotationally driven, and when the web pulling operation is performed, the nip roller 44b is moved to the release position. As a result, the frictional force is made zero by eliminating the contact with the web W.

Further, an L-shaped link 64 that displaces the movable roller 61 and the nip roller 44b is provided.

The rotary shaft 61a of the movable roller 61 is provided at one end of the link 64. Further, the other end of the link 64 is provided as a rotary shaft 65 so as to be rotatable in the X1-X2 directions. When the link 64 rotates in the X1 direction or the X2 direction around the rotation shaft 65, the rotation shaft 61a of the movable roller 61 moves in the X1 direction or the X2 direction along the guide rail 66 provided in an arc shape.

A spring 67 is attached near the L-shaped bent portion of the link 64. The urging force of the spring 67 causes the link 64 to rotate about the rotation shaft 65 in the X1 direction. When the movable roller 61 is moved to the transporting position, the link 64 pushes the nip roller 44b upward, and the nip roller 44b is guided by the guide rail 63a and moves to the pressing position.

A lock mechanism (not shown) is provided to regulate the operation of the link 64 when the movable roller 61 moves to the transport position and the nip roller 44b moves to the pressing position. As a result, the movable roller 61 is maintained at the transport position and the nip roller 44b is maintained at the pressing position.

On the other hand, when the movable roller 61 is moved to the low load position, the nip roller 44b is free fall by its own weight and guided by the guide rail 63a to be moved to the release position.

A lock mechanism (not shown) is also provided so as to regulate the operation of the link 64 even when the movable roller 61 moves to the low load position and the nip roller 44b moves to the release position. As a result, the movable roller 61 is maintained at the low load position and the nip roller 44b is maintained at the release position.

In this way, the link 64 shifts the nip roller 44b to the pressing position when the movable roller 61 shifts to the transport position, and shifts the nip roller 44b to the release position when the movable roller 61 shifts to the low load position.

Accordingly, the movable roller 61 and the nip roller 44b can be displaced at the same time by operating the link 64, so that the positions of the movable roller 61 and the nip roller 44b can be changed with a simple structure and only by rotating them. It can be switched when the web W is transported or when the web routing work is performed.

In each of the embodiments of the present invention, the web transfer device applied to the inkjet type web printing device that prints an image on the web W that is conveyed by ejecting ink from the inkjet head has been described as an example. The printing method of the apparatus is not limited to the inkjet method, but can be applied to various printing apparatuses such as a laser method and a stencil printing method. That is, any type of printing device can be applied as long as it is a printing device that prints an image on the web W.

(Appendix)
This application discloses the following inventions.

(Appendix 1)
A drive roller that conveys a long web as a print medium by being rotationally driven by the power transmitted from the drive unit,
A first position at which a wrap angle of the print medium with respect to the drive roller when the print medium is conveyed by the drive roller is a first wrap angle, and a second wrap angle smaller than the first wrap angle. And a movable roller provided so as to be movable between the second position and
A web transporting device comprising:

This makes it possible to increase the first winding angle, so that when the movable roller is moved to the transport position (first position), the print medium is sufficiently wound around the drive roller and grips, so that the drive roller does not slip. Can be prevented.

On the other hand, when the movable roller is moved to the low load position (second position), the wrapping angle of the print medium can be minimized, so that the print medium becomes slippery when the print medium is laid around. , Easy to set on the drive roller and easy to work.

(Appendix 2)
A nip roller provided so as to be movable between a pressing position for pressing the print medium with the drive roller and a releasing position for releasing the pressing;
The web transporting device according to (Supplementary note 1), further comprising:

Accordingly, when the print medium is conveyed, the nip roller can press the print medium between the drive roller that is moved to the pressing position and is rotationally driven, and when performing the print medium routing work, the nip roller does not move. The frictional force can be reduced to zero by eliminating contact with the print medium by being moved to the release position.

(Appendix 3)
A rotary shaft of the movable roller is provided at one end, and a link rotatably provided with the other end as a rotary shaft is further provided.
The link moves the nip roller to the pressing position when the movable roller moves to the first position, and moves the nip roller to the release position when the movable roller moves to the second position. The web transporting device according to (Supplementary note 2).

With this, the movable roller and the nip roller can be displaced at the same time by operating the link, so that the print medium is conveyed to the position of the movable roller and the nip roller by a simple structure and only by rotating. It can be switched at the time of printing or when carrying out the printing medium routing work.

1 Printing System 2 Unwinding Device 3 Web Printing Device 4 Winding Device 11 Web Roll Support Shaft 16 Web Roll 21 Housing 22 Transporting Part 23 First Printing Part 24 Second Printing Part 25 Printing Device Control Parts 31-40 Guide Rollers 41 Head lower support member 42 Serpentine roller 44 Conveying roller 44a Driving roller 44b Nip roller 44b1 Rotating shaft 51 Printing unit 61 Movable roller 61a Rotating shaft 62 Conveying motor (driving unit)
63a Guide rail 64 Link 65 Rotating shaft 66 Guide rail

Claims (3)

A drive roller that conveys a long web as a print medium by being rotationally driven by the power transmitted from the drive unit,
A first position at which a wrap angle of the print medium with respect to the drive roller when the print medium is conveyed by the drive roller is a first wrap angle, and a second wrap angle smaller than the first wrap angle. And a movable roller provided so as to be movable between the second position and
A web transporting device comprising: A nip roller provided so as to be movable between a pressing position for pressing the print medium with the drive roller and a releasing position for releasing the pressing;
The web conveyance device according to claim 1, further comprising: A rotary shaft of the movable roller is provided at one end, and a link rotatably provided with the other end as a rotary shaft is further provided.
The link moves the nip roller to the pressing position when the movable roller moves to the first position, and moves the nip roller to the release position when the movable roller moves to the second position. The web transporting device according to claim 2, wherein

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