JP2014151988A - Web transport mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web transport mechanism, capable of regulating the traveling position in the width direction of a web to achieve stable transport, suppressing deterioration of image quality due to abrasion of a roller, and elongating the time until the roller should be replaced.SOLUTION: A web transport mechanism at least comprises: web buffer means for slackening a web w to form an air loop; web guide means which has a plurality of shafts 5a, 5b where the web is passed, a pair of edge guide members 6a, 6b disposed on the plurality of shafts at a space substantially equal to the width of the web W, and a frame 20 for regulating the maximum space of the pair of edge guides, and is movable in the width direction of the web W; and driving means for moving the web guide means. The web guide means is moved so that the pair of edge guide members are moved for a fixed distance in the width direction of the web W of the transport amount of the web W while keeping the space substantially equal to the width of the web W.

Description

  The present invention relates to a web conveyance mechanism.

  2. Description of the Related Art There is known an image forming system (printing apparatus) provided with a web conveyance mechanism that continuously conveys a recording medium (hereinafter referred to as “web”) that is a long continuous belt-like sheet.

  When transporting a web that does not have a feed hole with a transport mechanism composed of transport rollers, it is necessary to control the web tension, travel position, etc. during high-speed transport with high precision. A printing apparatus provided with a transport mechanism for performing stably has been proposed (see, for example, Patent Document 1).

  Patent Document 1 discloses a printing unit that records and forms an image on a web, a pre-printing web control unit that controls a web traveling position and tension on the upstream side in the web conveyance direction with respect to the printing unit, and the printing unit. Describes an apparatus including a web travel position downstream of the web conveyance direction and a post-printing web control means for controlling tension.

  Moreover, it is described that the apparatus of patent document 1 is provided with the accumulation | storage part which gives a slack to a web, and the guide member which regulates the edge position of the web conveyed.

  Thus, an image forming system that combines a printing apparatus that forms an image on a web, a web processing apparatus that performs necessary processing on the web before or after printing, and an apparatus that unwinds and winds a roll-shaped web. A web buffer mechanism that cancels the tension acting on the web by slackening the web on the transport path, and a pair of web edge guides that are set to have a width substantially the same as the width of the web on the downstream side thereof There is known a web conveyance configuration in which the traveling position in the width direction can be easily corrected with respect to the web in a slack state by arranging and passing the web through the web edge guide.

  In the above image system, when the printing apparatus is an inkjet image forming apparatus, as the web processing apparatus, a predetermined processing liquid is applied to the web before image formation, and the landed ink is disturbed by the effect of the processing liquid. There are known ones that suppress this phenomenon and shorten the ink drying time.

  The means for applying the treatment liquid to the web is constituted by, for example, a multi-stage roll including a supply roller for supplying the treatment liquid, an application roller, and a pressure roller, and a gap between the nip between the application roller and the pressure roller. It is known that a processing liquid is applied to a web that has passed through.

  In such application means, when the web is sandwiched between the application roller and the pressure roller and conveyed, the edge of the web in the main scanning direction contacts the application roller, so that scratches and wear occur at the contact position. There is a problem of doing. The scratches and wear of the application roller cause application failure such as application unevenness of the processing liquid, and the application unevenness of the processing liquid leads to deterioration of the image quality of the formed image.

  In particular, as described above, when the web edge guide regulates the web traveling position in the width direction and stably conveys the web, the edge of the web is always in contact with the same position of the application roller. Wear of the application roller at this position becomes significant.

  When always using the same width web, wear of the applicator roller due to the edge of the web may not be a problem. However, it is rare to use only webs of the same width, and it is usually required to cope with webs of various sizes. For this reason, a portion worn by an edge portion of a certain size web is included in a print area in a wide web, and the image quality of an image corresponding to the worn portion may be deteriorated.

  Further, since the web transport mechanism is composed of a large number of rollers, if there is a roller that causes significant wear due to the contact of the edge of the web in addition to the application roller, it causes image formation defects such as image quality degradation. It can be.

  When replacing worn rollers in order to prevent deterioration in image quality, there is a problem that machine downtime occurs due to the cost of roller replacement and operation confirmation after the replacement and image readjustment.

  Therefore, in view of the above problems, the present invention regulates the traveling position in the width direction of the web to perform stable conveyance, suppresses the occurrence of image quality degradation due to roller wear, and requires replacement of the roller. It is an object of the present invention to provide a web transport mechanism that can extend the time.

  In order to solve the above problems, a web transport mechanism according to the present invention is provided on the downstream side in the transport direction of the web buffer means, the web buffer means for slackening the web on the web transport path to form an air loop, A plurality of shafts through which the web passes, a pair of edge guide members disposed on the plurality of shafts at substantially the same interval as the width of the web, and a frame that regulates a maximum interval between the pair of edge guide members At least a web guide means movable in the width direction of the web, and a drive means for moving the web guide means, wherein the pair of edge guide members have substantially the same interval as the width of the web. While holding, the web guide means is moved so as to move a certain distance in the width direction of the web according to the conveyance amount of the web A web transport mechanism, wherein the door.

  According to the web transport mechanism of the present invention, the travel position in the width direction of the web is regulated to perform stable transport, and the occurrence of deterioration in image quality due to wear of the rollers is suppressed, so that the rollers need to be replaced. It is possible to provide a web conveyance mechanism capable of extending the time until the time.

1 is a schematic overall configuration diagram illustrating an example of an image forming system. It is the schematic block diagram and partial enlarged view which show an example of a process liquid coating device provided with the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the flame | frame whose length of the width direction is variable. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. It is explanatory drawing which shows typically an example of the principal part of the web conveyance mechanism of this embodiment. In the web conveyance mechanism of this embodiment, a history recording means, (A) is an edge guide control means, (B) is a component replacement time display means, and (C) is a schematic diagram showing an aspect further comprising an input means.

  Hereinafter, a web conveyance mechanism according to the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments of the examples shown below, and other embodiments, additions, modifications, deletions, and the like can be changed within a range that can be conceived by those skilled in the art. Any aspect is included in the scope of the present invention as long as the operations and effects of the present invention are exhibited.

  FIG. 1 is a schematic overall configuration diagram illustrating an example of an inkjet image forming system. The image forming system includes a paper feeding device 100, a processing liquid (processing agent) coating device 101, and an ink jet printer 102 that is an image forming device, and further includes a reversing device, a second ink jet printer, and a post-processing device (not shown). It may be.

  As shown in FIG. 1, the paper feeding device 100 includes a sheet roll formed by winding a web W. The web W fed out from the paper feeding device 100 is conveyed to the processing liquid coating apparatus 101, and the processing liquid is applied to the image forming surface. The surface to which the treatment liquid is applied may be both sides or one side. The treatment liquid is applied in order to solve problems such as occurrence of bleeding, density, color tone, and back stagnation in image formation, and is, for example, a treatment agent having a function of aggregating ink.

The web W coated with the processing liquid in the processing liquid coating apparatus 101 is conveyed to the ink jet printer 102 and an image is formed on the surface coated with the processing liquid. When a reversing device for forming images on both sides of the web W is provided, the web W is transported to the reversing device and turned upside down, and then transported to a second ink jet printer (not shown). Image formation is performed.
In the case where a post-processing device is provided, the web W is transported to the post-processing device after a desired image is formed, and predetermined post-processing is performed.

  FIG. 2 is a schematic diagram showing an example of the processing liquid coating apparatus 101 that includes the web conveyance mechanism according to the present invention and constitutes the image forming system of FIG. 1, and shows an overall schematic configuration diagram (A) and web guide means. FIG. 2B is a partially enlarged view (B) and a partially enlarged view (C) of the coating means.

  As shown in FIG. 2A, a large number of guide rollers 1 are arranged in the processing liquid coating apparatus 101 to form a web conveyance path. The guide roller 1 has a bearing (not shown) at its end and is rotatably installed.

  A nip roller 3 is pressed by a pulling force of a spring (not shown) against a pulling roller 2 that is rotationally driven by a driving source (not shown) such as a motor. When the drawing roller 2 is rotated by the drive source, the web W is drawn from the sheet feeding device 100 into the processing liquid coating apparatus 101.

  The web W fed from the drawing roller 2 and the nip roller 3 forms an air loop R in the web buffer means. The air loop R is formed by loosening the web W with its own weight.

  The slack amount of the air loop R is monitored by the optical sensor 4 (4a to 4d), and the drawing roller 2 is driven and controlled so that the slack amount is constant.

  The web W that has passed through the air loop R is sent to a web guide means including a shaft (pass shaft) 5 and an edge guide member 6. As shown in FIG. 2B, the web guide means passes between two shafts 5 arranged in a direction orthogonal to the conveyance direction of the web W in an S shape.

The shaft 5 is provided with a pair of edge guide members 6 disposed at substantially the same interval as the width of the web W, and the travel position in the width direction of the web W is regulated by passing through the shaft 5. The
Note that the edge guide member 6 is movable along the axial direction of the shaft 5 and is fixed with screws or the like after the interval is adjusted according to the width of the web W.

The web W that has passed between the pass shaft 5 and the edge guide member 6 is in a stage before being fed to a feed nip roller 9 that is pressed by an infeed roller 8 and a spring (not shown), in order to suppress wrinkles and meandering. Appropriate tension is applied. In the example of FIG. 2 (A), friction is applied by winding around the tension shaft 7, and tension is applied.
The web W that has passed through the web guide means passes between the in-feed roller 8 and the feed nip roller 9 and is wound around the dancer roller 10.
The dancer roller 10 is rotatably attached to the movable frame 11 via a bearing (not shown) provided at the end of the roller to constitute a first dancer roller mechanism 12.
The first dancer roller mechanism 12 is movable along the gravitational direction A, and the drive source (see FIG. 5) of the infeed roller 8 is determined according to the output of the first dancer roller mechanism position detection means 13 (13a to 13d). The position of the first dancer roller mechanism 12 is adjusted by performing acceleration / deceleration control on the first dancer roller mechanism 12 (not shown).

  Next, the web W sequentially passes through a front surface application unit 19f for applying the treatment liquid on the front surface side and a back surface application unit 19r for applying the treatment liquid on the back surface side, and the treatment liquid is applied to both surfaces.

  As shown in FIG. 2C, the front surface application unit 19f and the back surface application unit 19r are configured by multi-stage rolls, and the processing liquid pumped up by the supply roller 61 is passed between the nip between the application roller 60 and the pressure roller 62. Transfer to the passed web W.

  The web W that has passed through the back coating means 19r is wound around a heating roll (not shown) having a heater lamp disposed therein, and the applied treatment liquid is dried. The web W after drying the processing liquid passes between the outfeed roller 14 that is rotationally driven by a driving source (not shown) such as a motor and the feed nip roller 9 that is pressed by a spring (not shown). The outfeed roller 14 is driven to rotate by the drive source and conveys the web W.

  The conveyed web W is wound around two rotatable dancer rollers 15a and 15b and a guide roller 1 disposed between both dancer rollers. The two dancer rollers 15 a and 15 b are rotatably attached to the movable frame 16 via bearings (not shown) provided at the roller ends, respectively, and constitute a second dancer roller mechanism 17.

  The dancer roller mechanism 17 is suspended by the web W. The second dancer roller mechanism 17 is also movable along the gravitational direction A, and the outfeed roller 14 according to the output of the dancer roller mechanism position detection means 18 (18a to 18d) for detecting the dancer roller mechanism 17 position. The position of the dancer roller mechanism 17 is adjusted by controlling the acceleration / deceleration of the driving source.

The web W that has passed through the treatment liquid coating apparatus 101 is sent to the downstream inkjet printer 102 as shown in FIG.
Similar to the treatment liquid coating apparatus 101, a web guide unit that regulates the travel position of the web W in the width direction is generally provided on the web conveyance path in the inkjet printer 102.

Hereinafter, the web conveyance mechanism of this embodiment will be described based on the mechanism in the treatment liquid coating apparatus 101.
3 to 6 schematically show the main part of the web transport mechanism of the present embodiment, the web guide means that is a mechanism that regulates the travel position of the web W in the width direction, and its driving means, An application roller 60 is shown as a roller member that is worn by contact with the web W. In addition, the structure on the conveyance path from the said web guide means to the application | coating roller 60 is abbreviate | omitted. Moreover, the web W conveyed is shown with the broken line.

  The web transport mechanism of the present embodiment is provided on the downstream side in the transport direction of the web buffer means, the web buffer means for slackening the web W on the web transport path to form the air loop R, and the web W passes between them. A plurality of shafts 5, a pair of edge guide members 6 disposed on the plurality of shafts 5 at substantially the same interval as the width of the web W, and a frame 20 that regulates the maximum distance between the pair of edge guide members 6, At least a web guide means movable in the width direction of the web W and a drive means for moving the web guide means, while the pair of edge guide members 6 maintain substantially the same interval as the width of the web W, The web guide means is moved so as to move a certain distance in the width direction of the web W according to the conveyance amount of the web W.

As described above, the edge guide member 6 is movable along the axial direction of the shaft 5, and after the interval is adjusted according to the width of the web W, the edge guide member 6 is fixed by a fixing means such as a screw.
When the fixing means is a screw, when the screw is loosened, the edge guide member 6 can be moved in the width direction of the web W on the shaft 5, and the distance between the edge guides 6 a and 6 b according to the width of the web W to be used. Can be adjusted.
For example, FIG. 4 shows an example in which the edge guide member 6b is moved in the direction of the arrow shown in FIG. 3 and the interval between the edge guides 6a and 6b is widened.

  Since the web W passes between the edge guide members 6a and 6b, the position in the width direction on the conveyance path is regulated by the edge guide member.

The web guide means has a frame (edge guide frame) 20 including a pair of edge guide members 6 a and 6 b (hereinafter also referred to as “edge guide member 6”), and moves relative to the main body frame 50.
For example, as shown in FIG. 5, the movement of the web guide means is performed such that the travel position in the width direction of the web W is switched at a constant cycle according to the conveyance amount of the web W. The timing and amount of movement will be described later.

  The main body frame 50 is provided with a screw shaft 21 screwed in a spiral shape, and the edge guide frame 20 has a female screw 22 fitted to the screw shaft 21.

The screw shaft 21 is connected to a drive motor 25 via a timing belt 24, and rotates when the drive motor 25 is driven, and the web guide including the edge guide frame 20, the pass shaft 5, and the edge guide member 6. The means are moved together.
The movement of the web guide means is not limited to a mode in which the edge guide frame 20 including the edge guide member 6 and the pass shaft 5 is moved integrally. For example, the edge guide member 6 includes a drive source. It may be a mode in which they are moved independently.
FIG. 6 shows a state where the web guide means has moved from the state shown in FIG.

  Next, the timing at which the edge guide member 6 is moved to switch the running position in the width direction of the web W and the manner in which the life of the application roller 60 is extended by the movement of the edge guide member will be shown by specific numerical values.

When the coating roller 60 is worn to cause uneven application of the processing liquid to the web W and the image quality is deteriorated, the wear amount of the application roller 60 at which the image quality deterioration is unacceptable is set to 10 μm. Further, the wear amount per 5 km of the transport amount of the web W is set to 1 μm.
In this case, in the conventional web conveyance mechanism in which the web guide means does not move, the end portion in the width direction of the web W (hereinafter referred to as “web edge”) continues to abut on the same portion of the application roller 60. The timing (part life) at which replacement is required is 50 km as the conveyance amount of the web W.

  That is, when an image is formed using the 18-inch wide web W after the 15-inch wide web W is conveyed by 50 km or more, uneven coating occurs at the edge of the 15-inch wide web, resulting in an 18-inch wide web. In the formed image, an unacceptable level of image quality degradation is observed.

  In recent years, since the printing speed has been increased, for example, when the web conveyance speed is set to 50 m / min, the time required for the conveyance amount to reach 50 km is about 16.7 hours (50,000 m ÷ 50 m / min ÷ 60 minutes).

  In contrast, in the web conveyance mechanism of the present embodiment, the edge guide member 6 is moved and the running position in the width direction of the web W is switched before the wear amount of the application roller 60 reaches 10 μm, thereby reducing the image quality. The wear of the connecting application roller 60 can be suppressed, and the time until the application roller 60 needs to be replaced (the component life of the application roller 60) can be extended.

In addition, it is necessary to ensure the area | region required in order to switch the traveling position of the width direction of the web W in the application roller 60. FIG. Although the width | variety of this area | region can be set suitably, specifically, when the width | variety of the web W to be used is 6.5-20.5 inches (165.1-520.7 mm), it exceeds the maximum width | variety. It is preferable to secure an area of about 30 mm in the range.
When the width of wear caused by the web edge is about 0.5 mm, it is preferable to set the width to be moved by switching the traveling position to about 1 mm. In this case, by securing an area of about 30 mm, 1 mm once It can be moved 30 times.

  In the above-described aspect, when the web W conveyance amount is 50 km or less, for example, when the conveyance amount is 40 km, the web guide means is moved once by 1 mm, so that the application roller 60 needs to be replaced (component life). ) Is 40 km × 30 times = 1,200 km as the conveyance amount of the web W. That is, the time until the application roller 60 needs to be replaced is extended, and its life is 20 times or more.

  The above-mentioned values are appropriately determined depending on the configuration of the apparatus including the web conveyance mechanism and the required specifications, and there are differences in the degree of the obtained effect, but the running position in the width direction of the web is regulated. Needless to say, there is no effect on the effect that it is possible to extend the time until it is necessary to replace the roller and to suppress the deterioration of the image quality due to the wear of the roller, as well as to perform stable and stable conveyance .

  The timing at which the edge guide member 6 is moved to switch the running position of the web W can also be set as appropriate. When a predetermined conveyance amount is reached during the web conveyance, the switching may be performed immediately. Switching may be performed at the first web conveyance stop timing (between print jobs) after reaching the conveyance amount. Even at the latter timing, the web used in the image forming system of the ink jet system is generally about 1.5 km per roll at the maximum, and therefore, switching is performed without greatly exceeding a predetermined conveyance amount. Image quality can be suppressed and deterioration in image quality can be suppressed.

  On the other hand, the edge guide member 6 may always be moved in the width direction of the web W while the web W is being conveyed. For example, by continuously moving the movement range indicated by “D” in FIG. 7 at a constant speed, the web edge can be prevented from continuing to contact the same portion of the application roller 60.

When the wear conditions of the application roller 60 are the same as in the above-described example, the edge guide member 6 is set so that the web edge does not continue to contact the same portion of the application roller 60 until the web conveyance amount reaches 40 km. The moving speed may be a speed of 0.5 mm per 40 km of the transport amount. The movement at this speed can be realized by driving with a small and inexpensive motor without deteriorating the conveyance stability of the web W.
In this case, the timing at which the application roller 60 needs to be replaced (component life) is 30 mm ÷ 0.5 mm × 40 km = 2,400 km as the web W conveyance amount. That is, the time until the application roller 60 needs to be replaced is extended, and its life becomes 40 times or more.

Furthermore, the edge guide member 6 can be configured to reciprocate in the width direction of the web W.
For example, by continuously reciprocating the movement range indicated by “D” in FIG. 7 at a constant speed, it is possible to avoid the web edge from being kept in contact with the same part of the application roller 60. By increasing the amount of movement per web conveyance amount within a range where the conveyance stability is not impaired, wear of the application roller 60 progresses minutely and evenly, so that a long life can be realized.

In the above-described movement in one direction, the edge guide member 6 is moved in a state in which a margin is secured before 10 μm, which is the wear amount exceeding the allowable range, that is, before the conveyance amount reaches 50 km. In the case where reciprocation is possible, minute wear can be accumulated evenly, so that it can be used until just before the total conveyance amount reaches 50 km.
For example, when the movement amount of the edge guide member 6 is 0.5 mm per 1 km of the web conveyance amount, the web conveyance amount reaches 50 km when the maximum movement width of 30 mm is reciprocated 25 times (move 50 times). 60 lifespan. The amount of wear is accumulated minutely and evenly within a moving width of 30 mm, and can be used until just before that. In this case, the replacement period of the application roller 60 is 30 mm ÷ 0.5 mm × 1 km × 50 times = 3,000 km. That is, the time until the application roller 60 needs to be replaced is extended, and its life is about 50 times.

8A to 8C schematically show an example of the edge guide frame 20 whose length in the width direction is variable. 8A and 8B are top views, and FIG. 8C is a side cross section.
The edge guide frame 20 regulates the maximum distance between the edge guide members 6a and 6b, but in this embodiment, the edge guide frame 20 can be expanded and contracted according to the distance between the edge guide members 6a and 6b.

As shown in FIGS. 8A and 8B, the edge guide frame 20 is composed of frame members (for example, 20a and 20b) divided into a plurality of portions in the width direction of the web. Each frame member is shown in FIG. Is engaged by a fixing screw 23 as shown in FIG.
As shown in FIG. 8B, one frame member 20a is formed with a long hole through which the shaft of the fixing screw 23 can slide in the width direction of the web, and the other frame member 20b has a fixing screw 23. A screw hole to be fastened is formed.

For example, when a web W having a width of 20.5 inches is used, the distance between the edge guide members 6a and 6b is set to about 20.5 inches, and the width of the edge guide frame 20 defined by the frame members 20a and 20b is set. The frame member 20a can be slid by loosening the fixing screw 23 to have an arbitrary width of 20.5 inches or more.
Further, when the web W having a width of 15 inches is used, the interval between the edge guide members 6a and 6b is set to about 15 inches, and the width of the edge guide frame 20 defined by the frame members 20a and 20b is set to a fixing screw. 23 can be loosened and the frame member 20a can be slid and moved to an arbitrary width of 15 inches or more.

As described above, the width of the edge guide frame 20 can be changed by sliding the frame member 20a. As shown in FIG. 9, from the width indicated by the broken line, depending on the width of the web W to be used. It can be shortened.
For example, when the width of the web to be used is changed from 20.5 inches to 15 inches, the width of the edge guide frame 20 can be shortened by about 5.5 inches (about 140 mm) together with the distance between the edge guide members 6a and 6b. it can. Along with this, it is possible to enlarge an area for switching the travel position of the web W in the width direction. In other words, when the web W having a maximum width of 20.5 inches was used, the width of the moving range was 30 mm, whereas when the web W having a width of 15 inches was used, the moving range was expanded to 170 mm. The time until the application roller 60 needs to be replaced can be extended, and the life can be extended.

  The example shown in FIGS. 8A to 8C and FIG. 9 is a case where the width direction of the web W is most shortened because the edge guide frame 20 is composed of two frame members (20a, 20b). Even if it exists, the maximum amount of the moving range expanded is about half of the width of the web W. On the other hand, when the edge guide frame 20 is divided into two or more divisions (for example, composed of three or more frame members with three or more divisions), the edge guide frame 20 is expanded most and shortened most. The difference can be increased, the movement range of the edge guide and the web travel position can be further expanded, and accordingly, the time until the application roller 60 needs to be replaced can be extended and the life can be extended. it can.

  FIG. 10 shows a mode in which the region in which the edge guide member 6 moves is set according to the width of the web W to be used. As shown in FIG. 10, the range (1) or (2) in which the pair of edge guide members 6a and 6b moves is an area set according to the width of the web W to be used, and the width of the web W to be used. It is switched by. In the figure, the range on the left side of the page indicated by (1) is called the front side, and the range on the right side of the page shown by (2) is called the rear side.

As described above, according to the configuration shown in FIGS. 8 and 9, the maximum movement width of the edge guide members 6 a and 6 b can be expanded to about 140 mm by shortening the edge guide frame 20, and the inside of the treatment liquid coating apparatus 101 can be increased. The web W conveyed is also periodically moved in the range of 140 mm in the web width direction.
However, in the ink jet printer 102 disposed downstream in the image forming system, the position in the width direction of the web W is constant in order to ensure the image quality of the formed image, particularly immediately below the ink head (not shown). There is a need.
In view of this, an Edge Position Control mechanism (EPC) is generally installed upstream of the inkjet printer 102 as a means for regulating (correcting) the travel position of the web W in the width direction.

However, since EPC is a mechanism that changes the path of the web W by tilting two rollers, there is a limit to the ability to correct the position in the width direction of the web W within a specified space.
For example, when the correction capability of this EPC is 50 mm, when using a web W having a width of 6.5 inches, the edge guide member 6 is moved within the range on the front side shown in (1) of FIG. Similarly, when a 10-inch wide web is used, if the edge guide member 6 is moved in the range of the front side shown in (1), the wear of the application roller 60 on the front side of the apparatus will progress. .
On the other hand, if the rear side shown in (2) of FIG. 10 is used, it is possible to make the wear in the width direction of the application roller 60 progress more evenly without overlapping the use range. Life can be extended and running costs can be reduced.

In the image forming system, an aspect in which webs W having various widths can be used is required, but the width of the web W actually used is often limited to several types.
By setting the movement region of the edge guide member 6 as shown in FIG. 7 according to the width of the web W to be used, the time until the application roller 60 needs to be replaced is extended and the life is extended. Can do.

  In the web conveyance mechanism of the present embodiment, the speed at which the edge guide member 6 is moved can be determined based on at least one of the web width, the web material, and the web conveyance speed. Based on the material of a web, conditions, such as thickness, a density, rigidity, a friction coefficient, are mentioned, for example.

  For example, when the thin web W is used, the movement amount of the edge guide member 6 is 0.5 mm per 1 km of the web conveyance amount, and when the thick web W is used, the wear of the application roller 60 is also promoted. The movement amount of the edge guide member 6 can be switched to 1 mm per 1 km of the web conveyance amount.

  Even when various webs are used, the wear of the application roller 60 is determined by determining the speed at which the edge guide member 6 is moved based on at least one of the web width, the web material, and the web conveyance speed. Can be evenly advanced, and the life of the application roller 60 can be extended.

  FIG. 11 and FIGS. 12A to 12C show an aspect including a history recording unit 200 that records the movement history of the edge guide member 6.

  As shown in FIG. 11, the web conveyance mechanism of this embodiment includes sensors 40a and 40b that detect the positions of the pair of edge guide members 6a and 6b, and a history recording unit 200 that records the movement history of the edge guide member 6. , And an edge guide control means 300 for determining a region in which the edge guide member 6 is moved according to the movement history.

The position of the edge guide member 6 is detected by the sensors 40a and 40b, and the information is recorded as the movement history of the edge guide member 6.
A region in which the edge guide member 6 is moved is set based on the movement history recorded in the history recording means 200. Specifically, the calculation is performed using the history recording unit 200 and the edge guide control unit 300, and the drive motor 25 is driven based on the obtained result to move the edge guide member 6. By performing such control, even when webs with various widths are used under various conditions, it is possible to promote the wear of the application roller 60 in the web width direction evenly.

  In FIG. 12B, based on the movement history recorded in the history recording means 200, the estimation means for estimating the replacement time of the roller member that comes into contact with the web W and wears, and the replacement time estimated by the estimation means A notification means (part replacement time display means) 400 for notifying is further shown.

Even when the history recording means 200 for recording the movement history of the edge guide member 6 and the edge guide control means 300 are provided and the wear of the application roller 60 is advanced as evenly as possible to extend the life. When wear of the application roller 60 accumulates over the entire width direction, it is inevitable to replace the application roller 60.
If printing is performed in a worn state where the application roller 60 should be replaced, and it is found that the deterioration in image quality is unacceptable after confirming the product, printing is performed again, and the web and coating liquid Wastefulness and reduced business efficiency.

  Therefore, as shown in FIG. 12 (B), when the notification means 400 is provided and the set life value of the application roller 60 (a value that ensures a certain margin for the life capability value) is reached, the application roller 60 It is possible to prompt the user for replacement by displaying the time for replacement. Thereby, waste caused by printing again can be reduced.

FIG. 12C shows an aspect further including an input unit 500 capable of setting a region in which the edge guide member 6 is moved.
The part where the web edge actually contacts and the coating roller 60 is worn and the image quality is deteriorated varies depending on the use conditions. However, when the image quality is significantly deteriorated in a specific part, use of that part is not recommended. By avoiding this, printing can be continued without replacing the coating roller.

For example, a blank paper portion where ink is not placed (no image to be printed) among various printed images does not actually cause a problem even if there is uneven coating of the treatment liquid.
Therefore, it determines the wear part of the application roller 60, the part where the application unevenness of the treatment liquid occurs, and the image to be printed, and sets the movement range of the edge guide member 6 for defining the optimum web travel position. By performing an input from the input unit 500, it is possible to extend the replacement time of the application roller 60, and it is possible to improve work efficiency and reduce running costs.

As described above, in the above-described embodiment, the example of the configuration using the screw shaft, the timing pulley, and the timing belt has been described as the driving unit for moving the web guide unit. However, the driving unit includes a connection by a wire, a cam, a gear, and the like. The structure by may be sufficient.
Further, the application roller 60 of the treatment liquid application apparatus has been described as an example of the member that comes into contact with the web and wears. However, any member may be used as long as it is a member that causes a problem of abrasion due to the web edge on the web conveyance path. The mechanism of this embodiment can be applied in the same manner.

W: Web R: Air loop 1: Guide roller 2: Pull-in roller 3: Nip roller 4: Optical sensor 5: Shaft (pass shaft)
6: Edge guide member 7: Tension shaft 8: In-feed roller 9: Feed nip roller 10: Dancer roller 11: Movable frame 12: First dancer roller mechanism 13: First dancer roller mechanism position detecting means 14: Out-feed roller 15: Dancer roller 16: Movable frame 17: Second dancer roller mechanism 18: Second dancer roller mechanism position detecting means 19f: Surface applying means 19r: Back surface applying means 20: Frame (edge guide frame)
21: Screw shaft 22: Female screw 23: Fixing screw 24: Timing belt 25: Drive motor 40: Position detection sensor 50: Body frame 60: Application roller 61: Supply roller 62: Pressure roller 100: Paper feeding device 101: Processing Liquid coating apparatus 102: Image forming apparatus (inkjet printer)
200: History recording means 300: Edge guide control means 400: Notification means 500: Input means

JP 2001-335206 A

Claims (9)

Web buffer means for forming an air loop by loosening the web on a web conveyance path;
A plurality of shafts provided downstream of the web buffer means in the transport direction, through which the web passes, a pair of edge guide members disposed on the shaft at substantially the same interval as the width of the web, and the pair A web guide means having a frame that regulates the maximum distance between the edge guide members of the web, and movable in the width direction of the web;
Drive means for moving the web guide means, at least,
The web guide means is moved so as to move a certain distance in the width direction of the web in accordance with the amount of web transport, while the pair of edge guide members maintains a substantially same distance as the web width. The web conveyance mechanism characterized by the above-mentioned.   The web conveyance mechanism according to claim 1, wherein the pair of edge guide members are always moved in the width direction of the web during conveyance of the web.   The web conveying mechanism according to claim 1, wherein the pair of edge guide members reciprocate in the width direction of the web.   The web conveyance mechanism according to any one of claims 1 to 3, wherein the frame has a variable length in the width direction of the web.   5. The web conveyance mechanism according to claim 1, wherein an area in which the pair of edge guide members moves is set according to a width of the web to be used.   6. The web transport mechanism according to claim 1, wherein a speed at which the pair of edge guide members is moved is determined based on at least one of a width, a material, and a transport speed of the web. A history recording means for recording a movement history of the pair of edge guide members;
The web transport mechanism according to any one of claims 1 to 6, wherein an area in which the pair of edge guide members is moved is set based on the movement history recorded in the history recording unit.   Based on the movement history recorded in the history recording means, an estimation means for estimating the replacement time of a roller member that comes into contact with the web and wears; and a notification means for notifying the replacement time estimated by the estimation means The web conveyance mechanism according to claim 7, further comprising:   The web conveyance mechanism according to claim 1, further comprising an input unit capable of setting a region in which the pair of edge guide members are moved.