JP2021167109A - Transfer device and foil pressing device - Google Patents

Abstract

To provide a transfer device such as a foil pressing device that can surely transfer a material for transfer such as a foil from a transfer web such as a foil holding film to an object to be transferred.SOLUTION: In a transfer device, a transfer web whose base sheet holds a material for transfer is stretched along a predetermined route. At a predetermined position on a conveyance passage of an object to be transferred in a transfer section which is a portion of the route are formed either or both of a tip-side pointing part that makes a tip side of the object to be transferred point a direction crossing the route of the transfer web in the transfer section and a rear end-side pointing part that makes a rear end side of the object to be transferred point the direction crossing the route of the transfer web in the transfer section.SELECTED DRAWING: Figure 12

Description

The present invention relates to a transfer device and a foil stamping device.

A transfer device that transfers a transfer substance such as a foil to a transfer material such as a sheet from a transfer web conveyed by roll-to-roll is known.

Japanese Unexamined Patent Publication No. 2007-276472

In the transfer device, it is preferable that the transfer substance can be reliably transferred from the transfer web to the transfer material.

The present invention has been made in such a situation, and one of the exemplary purposes of an embodiment thereof is to provide a transfer apparatus capable of more reliably transferring a transfer material from a transfer web to an object to be transferred.

In order to solve the above problems, in the transfer device of an embodiment of the present invention, a transfer web in which a transfer substance is held on a substrate sheet is hung along a predetermined path, and a transfer section which is a part of the predetermined path. In, the transferred substance is transferred to the transferred object by bringing the sheet-shaped object to be transferred into contact with the transfer web. In the transfer device, a tip-side directional portion is provided at a predetermined position on the transfer path of the transfer target in the transfer section so that the tip end side of the transfer target at the predetermined position faces the direction intersecting the transfer web path in the transfer section. It is formed.

Another aspect of the invention is also a transfer device. In this device, a transfer web in which a transfer substance is held on a substrate sheet is hung along a predetermined path, and a sheet-like transfer material is brought into contact with the transfer web in a transfer section that is a part of the predetermined path. Thereby, the transferred substance is transferred to the object to be transferred. In the transfer device, the rear end side orientation is such that the rear end side of the transfer target in the predetermined position faces the predetermined position of the transfer path of the transfer target in the transfer section so as to intersect the transfer web path in the transfer section. The part is formed.

Yet another aspect of the present invention is also a transfer device. In this device, a transfer web in which a transfer substance is held on a substrate sheet is hung along a predetermined path, and a sheet-like transfer material is brought into contact with the transfer web in a transfer section that is a part of the predetermined path. Thereby, the transferred substance is transferred to the object to be transferred. In the transfer device, the tip so that the tip end side of the transfer target in the first predetermined position faces the first predetermined position of the transfer path of the transfer target in the transfer section so as to intersect the path of the transfer web in the transfer section. A side-oriented portion is formed, and a direction in which the rear end side of the transfer target in the second predetermined position intersects the transfer web path in the transfer section at a second predetermined position of the transfer path of the transfer target in the transfer section. A rear end side directional portion is formed so as to face.

Yet another aspect of the present invention is a foil stamping device. This device is a foil pressing device that transfers foil from a foil holding film in which foil is laminated on a film to an object to be transferred and presses the foil. It comprises the configuration of either transfer device.

According to the present invention, the transfer material can be reliably transferred from the transfer web to the object to be transferred.

It is a figure which shows typically the printing system of embodiment. It is a figure which shows typically the printing system of embodiment. It is a top view which shows the detail of a resist part 24. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 5 (a) to 5 (d) are views showing a state of foil pressing by the foil pressing device according to the comparative example. It is a side view of the foil stamping apparatus of FIG. It is a side view of the foil stamping apparatus of FIG. It is a figure which shows the periphery of the foil stamping section in an enlarged manner. It is a figure which shows the periphery of the sheet transport guide 82 shown in FIG. 8 in a further enlarged view. It is a figure which shows the periphery of the foil stamping section in an enlarged manner. It is a figure which shows the periphery of the sheet transport guide 82 shown in FIG. 10 in a further enlarged view. It is a figure which shows the periphery of the foil stamping section in an enlarged manner. It is a figure which enlarges and shows the periphery of the foil stamping section when the nip rollers 62, 64 are in the raised position. 14 (a) to 14 (f) are views for explaining the feed back by the foil stamping device of FIG. 15 (a) and 15 (b) are views showing the state of foil pressing.

Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments. The embodiments are not limited to the invention, but are exemplary, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention. The same or equivalent components, members, and processes shown in the drawings shall be designated by the same reference numerals, and redundant description will be omitted as appropriate.

1 and 2 are diagrams schematically showing a printing system 10 in which the foil pressing device (transfer device) 16 according to the embodiment is used. FIG. 1 is a side view and FIG. 2 is a plan view. The printing system 10 is a device that prints a predetermined sheet while transporting the sheet. The material of the sheet is various such as paper, cloth, resin, and metal. After that, the direction in which the sheet is conveyed (the direction from right to left in FIGS. 1 and 2) is the direction orthogonal to the conveying direction Y and the conveying direction Y (the direction orthogonal to the paper surface in FIG. 1 and the vertical direction in FIG. 2). ) Is called the width direction X.

The printing system 10 includes a paper feed device 12 that feeds sheets one by one, a varnish application device 14 that applies varnish to sheets that are fed one by one, and varnish on a sheet by utilizing the tackiness of the varnish. A foil pressing device 16 that presses the foil by transferring the foil to the paper, a stacker 18 that stores sheets, and a control device 20 that integrally controls the printing system 10 are provided. The paper feeding device 12, the varnish coating device 14, the foil pressing device 16, and the stacker 18 are arranged in a row in this order from the upstream side (right side in FIGS. 1 and 2) in the transport direction Y. The control device 20 is connected to the paper feeding device 12, the varnishing device 14, the foil pressing device 16, and the stacker 18 via the network 2.

The paper feeding device 12 includes a feeder 22, a corona processing unit 26, and a resist unit 24. The feeder 22 includes a table 28 and a suction head 30. Seats are loaded on the table 28. The table 28 is configured to be able to move up and down. The suction head 30 feeds out the sheets loaded on the table 28 one by one in order from the top.

The corona processing unit 26 (surface modification unit) has an electrode 36 (applied electrode) arranged above the transport path 34 and a dielectric roller 38 arranged below the transport path 34 so as to face the electrode 36 vertically. (Counter electrode) and. The corona processing unit 26 modifies the surface of the sheet delivered by the feeder 22 by the corona discharge between the electrode 36 and the dielectric roller 38. Specifically, hydrophilic groups are generated on the surface of the sheet to improve wettability. When the sheet is conveyed while being attracted to the transfer path 34 by the air suction unit 40, the distance between the electrode 36 and the sheet becomes constant, and the corona discharge becomes stable. The air suction unit 40 is configured to generate a negative pressure by arranging one of the suction ports of an exhaust blower (not shown), but it may be configured to generate a negative pressure by arranging a suction fan.

The resist unit 24 aligns the positions of the sheets sent out by the feeder 22 in the width direction X by abutting against the resist reference guide 32.

The varnish application device 14 includes a sheet sensor 42, a pair of CCD sensors 44, at least one varnish discharge unit 46, a semi-curing ultraviolet lamp 48, and a main curing ultraviolet lamp 50. The pair of CCD sensors 44, the varnish discharge portion 46, the semi-curing ultraviolet lamp 48, and the main curing ultraviolet lamp 50 are arranged so as to be arranged in this order from the upstream side. In the illustrated example, the varnishing device 14 includes, but is not limited to, one varnish discharging portion 46 extending over the entire width direction X. It may be included, or may include two or four or more varnish ejection portions 46. An LED that irradiates ultraviolet rays is used for the semi-curing ultraviolet lamp 48 and the main curing ultraviolet lamp 50, but other light sources such as light bulbs and fluorescent lamps may be used as long as they irradiate ultraviolet rays. It is desirable that the light source has an adjustable output.

The sheet sensor 42 detects the sheet fed from the paper feeding device 12.

The varnish discharge unit 46 is a line-type inkjet head, although not particularly limited. The varnish discharge unit 46 discharges the ultraviolet curable varnish according to the varnish discharge data, triggered by the detection of the tip edge of the sheet by the sheet sensor 42, and applies the ultraviolet curable varnish to the sheet. The varnish discharge data is data indicating where on the sheet the varnish is applied.

A background image and a plurality of registration marks serving as a reference for specifying the position of the background image may be printed in advance on the sheet to be fed by the paper feed device 12. The varnish application device 14 applies varnish so as to have a predetermined relationship with the base image according to the varnish discharge data defining the varnish application portion of the sheet. For example, the varnish is applied so as to overlap the base image. You may.

Here, the background image of the sheet may be misaligned or distorted. Therefore, when the varnish is applied so as to have a predetermined relationship with the background image, it is necessary to correct the varnish discharge data in consideration of deviation and distortion. For example, the CCD sensor 44 images the sheet triggered by the detection of the sheet by the sheet sensor 42, the control device 20 analyzes the image data captured by the CCD sensor 44, and the difference from the theoretical positions of the plurality of registration marks causes the CCD sensor 44 to image the sheet. The varnish discharge data in the area surrounded by the registration mark may be corrected. The method described in Japanese Patent Application Laid-Open No. 2016-0838998 previously filed by the applicant can be applied to the amendment.

The semi-curing ultraviolet lamp 48 irradiates the varnish on the sheet with ultraviolet rays having a relatively weak output to semi-cure the varnish. Semi-curing refers to curing the varnish lightly (for example, in a state where it can be further cured) so as to reduce the fluidity of the varnish but not completely cure it. By semi-curing at least the surface of the varnish, it is possible to prevent the varnish from flowing on the sheet and stabilize the position of the varnish on the sheet while maintaining the tackiness of the varnish. The semi-cured varnish is finally cured in the foil pressing device 16. When the foil is not transferred to the sheet (the foil is not pressed), the semi-curing ultraviolet lamp 48 is usually turned off. The semi-curing ultraviolet lamp 48 may be used when the foil is not pressed. For example, when the varnish applied on the sheet tends to bleed, the semi-curing ultraviolet lamp 48 is turned on to semi-cure at least the surface of the varnish. As a result, varnish bleeding can be suppressed.

The UV lamp 50 for main curing irradiates the varnish applied to the sheet with ultraviolet rays to cure the varnish. When transferring the foil to the sheet (pressing the foil), the ultraviolet lamp 50 for main curing is turned off.

That is, when the sheet is foil-pressed, the semi-curing ultraviolet lamp 48 semi-cures the varnish, and the foil-pressing ultraviolet lamp 66 of the foil pressing device 16 mainly cures the semi-cured varnish. In this case, the ultraviolet lamp 50 for main curing is turned off. When the sheet is not foil-pressed, that is, only the varnish is applied to the sheet, the varnish is main-cured with the main-curing ultraviolet lamp 50. In this case, the semi-curing ultraviolet lamp 48 and the foil pressing ultraviolet lamp 66 of the foil pressing device 16 are turned off. As described above, the semi-curing ultraviolet lamp 48 may be turned on even when the foil is not pressed. Further, although an LED that irradiates ultraviolet rays is used as the light source of the ultraviolet lamp 66 for foil pressing, other light sources may be used as long as they irradiate ultraviolet rays.

Note that FIG. 1 is drawn so that the sheet is conveyed on one circumferential belt at the portion facing the varnish discharge portion 46, the main curing ultraviolet lamp 48, and the semi-curing ultraviolet lamp 50. The portion facing the discharge portion 46, the portion facing the main curing ultraviolet lamp 48, and the portion facing the semi-curing ultraviolet lamp 50 are configured so that all or part of them are conveyed by individual circulation belts. May be good.

The foil pressing device 16 conveys the web (transfer web) 52 in a roll-to-roll manner. The web 52 of the present embodiment is a foil holding film in which a foil such as a metal foil is held (laminated) on a long film (base sheet). In the foil pressing device 16, the web 52 and the sheet are brought into contact with each other while being conveyed. Due to its tackiness, the foil held by the web 52 adheres to the semi-cured varnish on the sheet. In this state, that is, in a state where the foil is held by the web 52 and adhered to the semi-cured varnish, the foil pressing ultraviolet lamp 66 irradiates the varnish with ultraviolet rays to mainly cure the varnish. When the varnish is main-cured, the force of the main-cured varnish to adhere the foil is stronger than the force of the web 52 to hold the foil. In this state, when the sheet is conveyed to separate the sheet and the web 52, the foil held by the web 52 is transferred to the varnished portion on the sheet.

The stacker 18 accumulates the sheets carried out from the foil pressing device 16.

The control device 20 is an information processing terminal such as a PC. The control device 20 receives an input about the definition of the print job. The control device 20 may display a predetermined job management screen and accept input about a job definition via the job management screen. Job definitions include, for example, the number of sheets to be printed (the number of copies to be printed), the sheet size of the sheets to be printed, varnish ejection data, the presence or absence of corona treatment, the presence or absence of foil stamping, and the strength of pinning (the degree of cure of semi-curing). Adjustment, etc. are included. The control device 20 controls the paper feeding device 12, the varnishing device 14, and the foil pressing device 16 based on the definition of the job.

The above is the basic configuration of the printing system 10.

As a modification, the printing system 10 may include a printer for printing a background image and a registration mark on a sheet instead of the paper feeding device 12, and may feed the sheets one by one from the printer.

Further, the printing system 10 may include a post-processing device for cutting and binding sheets between the foil pressing device 16 and the stacker 18.

FIG. 3 is a top view showing the details of the resist portion 24, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. The resist unit 24 includes a resist reference guide 32, an oblique feed mechanism 102, an inlet guide 104, a transport guide 106, and an outlet guide 108. Sa and Sb indicate sheets to be conveyed to the resist unit 24.

The resist reference guide 32 is provided on the upper side in FIG. 3 in the width direction X (the right side in the transport direction Y, the left side in FIG. 4, hereinafter referred to as the “reference side”). The resist reference guide 32 extends in the transport direction Y.

The resist reference guide 32 has a horizontally provided support surface 32a, a reference surface 32b that rises upward at a right angle from the support surface 32a, and a ceiling surface 32c that is parallel to the support surface 32a and faces the height direction. (See FIG. 4). The reference surface 32b is provided parallel to the transport direction Y and extends in the transport direction Y over substantially the entire area of the resist portion 24.

The oblique feed mechanism 102 is provided on the resist reference guide 32 side in the width direction X. The diagonal feed mechanism 102 includes a diagonal feed belt 110 and a suction chamber 112. The oblique feed belt is orbitally driven at an angle with respect to the transport direction Y so as to approach the resist reference guide 32 toward the downstream side. In the present embodiment, four diagonal feed belts 110 are provided at intervals in the width direction X. The number of diagonal feed belts 110 is not limited to four.

The suction chamber 112 is provided inside the orbiting oblique feed belt 110 (see FIG. 4). In the suction chamber 112, a portion corresponding to a gap between a plurality of oblique feed belts 110 arranged at intervals in the width direction, in other words, a portion avoiding the oblique feed belt 110 in a plan view, and further in other words, an oblique position in a plan view. A plurality of openings 110a are provided in a portion exposed without being blocked by the feed belt 110. The openings 112a are arranged at predetermined intervals along the outside of the end portion of the oblique feed belt 110 in the width direction X. When a suction fan (not shown) is turned on, a negative pressure is formed in the suction chamber 112, and air is sucked from the opening 112a.

The inlet guide 104 extends in the width direction X adjacent to the upstream end of the resist portion 24 in the transport direction Y, that is, the corona processing portion 26. The outlet guide 108 extends in the width direction X adjacent to the downstream end portion of the resist portion 24 in the transport direction Y, that is, the varnish coating device 14.

The transport guide 106 is a plate member provided on a portion closer to the side opposite to the reference side (hereinafter referred to as “anti-reference side”) in the width direction in which the oblique feed mechanism 102 is provided. The inlet guide 104, the transport guide 106, and the outlet guide 108 receive the lower surface of the sheet to be transported. The inlet guide 104, the transport guide 106, and the outlet guide 108 are, for example, stainless steel plates, preferably made of a runner stainless steel plate having good slipperiness.

The lower surface of the sheet that has passed through the corona processing section 26 is guided by the inlet guide 104 to enter the resist section 24. The upper surface of the oblique feed belt 110 orbits in the direction from right to left in FIG. By sucking air from the opening 112a, the lower surface of the sheet is attracted to the diagonal feed belt 110 and conveyed by the diagonal feed belt 110. While the sheet is conveyed along the circumferential direction of the oblique feed belt 110, the position in the width direction X of the sheet is in contact with the reference surface 32b from a position (sheet Sa) away from the reference surface 32b. It becomes the position (seat Sb). After that, the edge on the reference side is conveyed along the reference surface 32b while being in contact with the reference surface 32b, and the lower surface is guided by the outlet guide 108 and sent to the varnish coating device 14. Therefore, the position of the reference side edge of the sheet in the width direction X is resisted at a fixed position defined by the reference surface 32b and sent to the varnish application device 14.

The position of the resist reference guide 32 in the width direction X is fixed closer to the reference side of the apparatus. Therefore, the sheet is always resisted at the position X in the width direction of the reference side edge at the fixed position where the reference surface 32b is located. That is, the sheet is sent to the varnish coating device 14 with reference to the reference side edge. On the other hand, the position of the resist reference guide 32 in the width direction X is set according to the size of the sheet in the width direction X so that the center position of the sheet in the width direction X is always a predetermined position in the width direction X of the apparatus. It may be adjusted. Then, it can be applied to the device with reference to the center position in the width direction X of the sheet. In this case, it is desirable that the oblique feed belt 110 is also movable together with the resist reference guide 32.

The upper surface of the oblique feed belt 110 is substantially the same height as the support surface 32a of the resist reference guide 32. Therefore, the sheet whose lower surface is attracted to the transport belt 110 moves on the support surface 32a without bending downward and comes into contact with the reference surface 32b. Further, since the ceiling surface 32c is formed in the vicinity of the reference surface 32b in the width direction X, the upward bending of the seat is also suppressed. Therefore, it is possible to prevent problems such as buckling when the reference side edge of the sheet comes into contact with the reference surface 32b.

The upper surface of the transport guide 106 is lower than the upper surface of the oblique feed belt 110. Therefore, the sheet that is suction-conveyed to the oblique feed belt 110 is not easily affected by the friction with the transport guide 106, which enables stable transport and resist, and prevents the sheet from being scratched by the friction with the transport guide 106. be able to. The upper surface of the transport guide 106 is formed, for example, 2 to 3 mm lower than the upper surface of the oblique feed belt 110.

Since the corona treatment unit 16 (surface modification unit) generates hydrophilic groups on the sheet surface by utilizing the corona discharge and enhances the wettability, varnish repelling can be effectively prevented. However, when the corona processing portion 16 is arranged near the varnish coating portion 14, there is concern about the influence of the corona discharge on the varnish coating portion 14. In particular, when an inkjet head is used for the varnish coating portion 14, the durability is significantly reduced due to the influence of corona discharge. On the other hand, since the resist unit 24 resists by abutting against the reference surface 32b while being conveyed by the oblique feed belt 110, the processing efficiency is good because the sheet is not stopped, but a certain amount of transfer length is required. In the present embodiment, since the resist portion 24 is arranged between the corona treatment portion 16 and the varnish coating portion 14, the varnish coating portion 14 can be separated from the corona treatment portion 16 by that amount, and the corona It is possible to suppress a decrease in durability of the varnish coating portion 14 due to the influence of electric discharge. Therefore, it is possible to obtain an apparatus having good sheet processing efficiency in the resist portion and excellent durability.

Subsequently, the problem to be solved by the foil pressing device 16 according to the present embodiment will be described with reference to a comparative example. In the following, among the web transport paths that are the transport paths of the web 52, the section for transferring the foil to the sheet is referred to as a “foil stamping section”.

5 (a) to 5 (d) are views showing a state of foil pressing by the foil pressing device according to the comparative example. 5 (a) to 5 (d) show foil stamping scenes in chronological order. In FIGS. 5 (a) to 5 (d), the web 52 shown by the solid line indicates an unused web (that is, a web in which the foil is held). The web 52 shown by the dotted line is a used web (that is, a web in which at least a part of the foil is peeled off by the transfer of the foil to the sheet S1, or a web facing the varnished region R on the sheet S1 in the foil pressing section P. The web) on which the transfer of the foil to the sheet S1 has begun is shown.

In FIG. 5A, the sheet S1 is passing through the foil pressing device section P, and the foil is transferred from the web 52 to the varnish coating region R on the sheet S1. As shown in FIG. 5B, the feeding of the web 52 is stopped at the timing when the rear end of the sheet S1 reaches the downstream end of the foil pressing section P, that is, at the timing when the sheet S1 passes through the foil pressing section P. As shown in FIG. 5C, when the next sheet S2 reaches the foil stamping section P, the feeding of the web 52 is restarted. In FIG. 5D, the sheet S2 is passing through the foil pressing section P, and the foil is transferred from the web 52 to the varnish coating region R on the sheet S2. In particular, the foil is transferred from the web 52 located upstream of the foil pressing section P in FIG. 5 (c). In the example of FIG. 5, the timing at which the feeding of the web 52 is stopped is the timing at which the rear end of the sheet S1 reaches the downstream end of the foil pressing section P (FIG. 5B), but the varnishing region R on the sheet It may be the timing when the rear end reaches the downstream end of the foil pressing section P. Similarly, the timing at which the feeding of the web 52 is restarted may be the timing at which the varnish coating region R on the sheet reaches the foil pressing section P.

Here, the web 52 is sent out only while the sheet passes through the foil pressing section P, or only while the varnishing region R on the sheet passes through the foil pressing section P. As a result, it is possible to reduce the number of webs 52 that are wound around the winding roll 76 while they are unused. However, even so, when the sheet S1 passes the foil pressing transfer section P, that is, the web 52 existing in the foil pressing section P at the time of FIG. 5C is not used for the transfer to the next sheet S2. Therefore, it will be wound on the take-up roll 76 without being used. That is, the foil holding film is wasted.

If the web 52 existing in the foil pressing section P in FIG. 5C is returned to the upstream side of the foil pressing section P before the next sheet S2 reaches the foil pressing section P, the transfer to the next sheet S2 can be performed. Since it is used, wasteful consumption can be reduced. In order to realize this, it is conceivable to rotate the unwinding roll in the reverse direction to rewind the web 52, but the foil unwound on the unwinding roll may be wrinkled. Further, the foil pushing device 16 according to the present embodiment uses a friction shaft for the unwinding shaft and the winding shaft as described later, and fixes the shaft core portion of the friction shaft of the unwinding shaft to the housing of the device. Since the drive motor for reversing is not provided, the unwinding roll cannot be rotated in the reverse direction in the first place. Therefore, the foil pressing device 16 according to the present embodiment does not rewind the web 52 to the unwinding roll, but at least a part of the web 52 that has passed the upstream end of the foil pressing section P, that is, the web 52 existing in the foil pressing section P. A "feedback" is realized in which at least a part of the foil is returned to the upstream side of the foil pressing section P.

Subsequently, the configuration of the foil pressing device 16 will be described in detail. 6 and 7 are views showing the foil pressing device 16. 6 and 7 are side views. FIG. 6 shows the case where the nip roller or the like is in the descending position, and FIG. 7 shows the case where the nip roller or the like is in the ascending position.

The foil pressing device 16 includes a plurality of transport rollers 54, a winding shaft 56, a winding shaft 58, a plurality of guide rollers 60, a first nip roller 62, a second nip roller 64, an ultraviolet lamp 66 for foil pressing, and the like. It includes a sheet detection sensor 77.

The plurality of transfer rollers 54 convey the sheet toward the downstream side in the transfer direction (left side in FIGS. 6 and 7) while sandwiching the sheet between the paper holding rollers 72, the nip rollers 62, 64, or the paper holding rollers 73. ..

The paper holding rollers 72 are spherical, and a pair of paper holding rollers 72 separated from each other in the width direction X are arranged with respect to one transport roller 54. At least one of the pair of paper holding rollers 72 is configured to be movable in the width direction X according to the width of the sheet to be conveyed. With this configuration, only both ends of the sheet to be transported in the width direction X are sandwiched between the paper holding rollers 72 and the transport roller 54 for transport. When only one of the pair of paper holding rollers 72 is movable in the width direction X, a roller-shaped paper holding member may be used instead of the other paper holding rollers 72 that do not move in the width direction X. On the upstream side (right side in FIG. 6) in the transport direction Y from the foil pressing section P, the semi-cured varnish on the sheet is exposed. When the transport member comes into contact with the exposed varnish, the varnish coating state may be disturbed or the transport member may become dirty. On the other hand, when the paper pressing roller 72 presses only both ends of the sheet in the width direction X, the occurrence of this problem can be suppressed.

The paper holding roller 73 is a member in which a plurality of roller portions 73a are intermittently arranged with respect to one rotating shaft 73b extending in the width direction X. The plurality of roller portions 73a are configured not to move in the width direction (axial direction) X. Since the varnish on the sheet is finally cured on the downstream side in the transport direction Y from the foil pressing section P, even if the roller portion 73a of the paper pressing roller 73 comes into contact with the sheet, the sheet can be pressed without causing the above-mentioned problems. Can be transported.

The unwinding shaft 56 supports an unused web roll (hereinafter referred to as an unwinding roll 74). The unwinding shaft 56 and the winding shaft 58 are composed of a friction shaft. This friction shaft includes an outer peripheral ring that holds a paper tube that serves as a core for the unwinding roll 74 and the take-up roll 76, and a shaft core portion that rotatably holds the outer peripheral ring. The structure is such that the holding torque, which is the resistance when rotating the paper, can be adjusted. When an external force that tries to rotate the outer ring is applied to the shaft core, if the rotation torque due to this external force is larger than the holding torque, the outer ring rotates with respect to the shaft core and the rotation torque is held. When it is smaller than the torque, the outer ring keeps the state of being stopped with respect to the shaft core portion. The shaft core portion of the unwinding shaft 56 is fixed to the housing of the apparatus, and the shaft core portion of the winding shaft 58 is rotationally driven by a drive source (not shown). The unwinding shaft 56 acts on the fixed shaft core portion when a force that causes the web 52 to rotate with the sheet or the transport roller 54 acts on the foil pushing section P and a force that pulls out the web 52 from the unwinding roll 74 acts. The holding torque is set so that the outer ring rotates.

The plurality of guide rollers 60, the first nip roller 62, and the second nip roller 64 define a substantially U-shaped web transport path from the unwinding roll 74 to the winding roll 76. The second nip roller 64 is adjacent to the first nip roller 62 on the downstream side of the web transport path. The first nip roller 62 and the second nip roller 64 define a horizontally extending section of the web transport path. In the present embodiment, the section corresponds to the foil stamping section P.

A guide roller (hereinafter, also referred to as a guide roller 60a) of a plurality of guide rollers 60 that defines a web transport path on the upstream side of the foil pressing section P, and a plurality of guide rollers that define a web transport path on the downstream side. One of the guide rollers 60 (hereinafter, also referred to as a guide roller 60b) is configured to be movable in the transport direction Y. The guide roller 60a is a section of the web transport path on the upstream side of the foil pressing section P, and is upstream of the other guide rollers 60 in the transport direction Y in the section of the web transport path in which the web 52 generally advances vertically downward. It is provided on the side. The guide roller 60b is a section of the web transport path on the downstream side of the foil pressing section P, and is downstream of the other guide rollers 60 in the transport direction Y in the section of the web transport path in which the web 52 generally advances vertically upward. It is provided on the side.

Both the guide roller 60a and the guide roller 60b are connected to the bracket 80. Therefore, the guide roller 60a and the guide roller 60b are interlocked with each other. When the bracket 80 is moved to the upstream side in the transport direction Y (right side in FIGS. 6 and 7) by a drive device (not shown), the guide rollers 60a and 60b also move to the upstream side in the transport direction Y, and the bracket 80 is moved in the transport direction. When moved to the downstream side of Y (right side in FIGS. 6 and 7), the guide rollers 60a and 60b also move to the downstream side in the transport direction Y.

When the guide rollers 60a and 60b are moved to the upstream side in the transport direction Y, the transport path on the upstream side becomes longer and the transport path on the downstream side becomes shorter than the foil pressing section P in the web transport path. Further, when the guide rollers 60a and 60b are moved to the downstream side in the transport direction Y, the transport path on the upstream side of the foil pressing section P in the web transport path becomes shorter and the transport path on the downstream side becomes longer. Preferably, when the guide rollers 60a and 60b are moved in the transport direction Y, the transport path on the upstream side and the transport path on the downstream side of the foil pressing section P in the web transport path are increased or decreased in a complementary manner. When the guide rollers 60a and 60b are moved to the upstream side in the transport direction Y, the holding torque of the friction shaft of the unwinding shaft 56 is controlled to be increased so that the outer peripheral ring does not rotate with respect to the shaft core portion. The unwinding from the roll 74 is stopped. As a result, at least a part of the web 52 past the upstream end of the foil stamping section P, that is, at least a part of the web 52 existing in the foil stamping section P is returned to the upstream side of the foil stamping section P. That is, the web 52 that has reached the foil pressing section P can be fed back without rewinding the web 52 unwound from the unwinding roll 74 to the unwinding roll 74. If the resistance when moving the web 52 by feeding back is smaller than the holding torque of the unwinding shaft 56, the unwinding from the unwinding roll 74 is stopped without controlling to increase the holding torque. It is possible to send back at.

The web 52 and the sheet come into contact with each other between the first nip roller 62 and the second nip roller 64. At this time, the foil is transferred from the web 52 to the semi-cured varnish on the sheet. During the transfer, the varnish on the sheet and the web 52 are temporarily adhered to each other, so that the web 52 is fed at the same speed as the sheet. The second nip roller 64 may be rotationally driven to feed the web 52 at the same speed as the seat. Here, a drive source for rotationally driving the nip rollers 62 and 64 is provided, and when a speed difference in surface moving speed occurs between the nip rollers 62 and 64 and the opposing transport rollers 54, the web 52 holding the foil comes into contact with the nip rollers 62 and 64. A speed difference occurs between the web 52 and the sheet on which the foil is transferred and which comes into contact with the transport roller 54, which causes wrinkles in the foil. On the other hand, in the present embodiment, the foil is wrinkled because the drive source for rotationally driving the nip rollers 62 and 64 is not provided and the nip rollers 62 and 64 rotate in a driven manner with respect to the movement of the web 52. It is suppressing.

The take-up shaft 58 winds the web 52 unwound from the unwind roll 74 into a roll shape. Hereinafter, the roll-shaped web 52 wound by the winding shaft 58 is referred to as a winding roll 76. The take-up shaft 58 is composed of a friction shaft. The holding torque of the take-up shaft 58 is set to be smaller than the holding torque of the take-up shaft 56, and the shaft core portion of the take-up shaft 58 is driven by a drive source (not shown) to rotate. Further, the friction shaft is provided with a plurality of outer ring rings in the axial direction, and has a structure that allows the rotation speed to differ depending on the position in the axial direction (that is, the width direction X). Specifically, only a part of the plurality of outer peripheral rings may be rotated and the other outer peripheral rings may be stopped, and further, the rotation speeds of the rotating outer peripheral rings may be different from each other.

An encoder (not shown) for detecting the rotation speed is attached to at least one of the guide rollers 60. It is desirable that the guide roller 60 to which the encoder is attached has a material having a high coefficient of friction on its surface to reduce slippage with the web 52. In the foil pressing section P, the foil on the outer peripheral surface of the web 52 comes into contact with the surface of the sheet or the transport roller 54, and moves to the downstream side in the transport direction Y of the sheet by accommodating with these surfaces. The control device 20 calculates the moving speed of the web 52 based on the detection result by the encoder, and the unwinding shaft is set so that the feeding speed of the web 52 from the unwinding roll 74 is slower than the calculated moving speed of the web 52. Controls the number of revolutions of 56. At this time, the moving speed of the web 52 is faster than the feeding speed due to the rotation of the unwinding shaft 56, but the peripheral surface of the unwinding shaft 56 made of the friction shaft rotates with respect to the drive input shaft, and the peripheral surface is driven. By rotating faster than the input shaft, the web 52 can be sent out so as to be the same speed as the moving speed of the sheet in the foil pressing section P while keeping the web 52 stretched.

Further, the control device 20 controls the rotation speed of the drive rotation of the shaft core portion of the take-up shaft 58 so that the take-up speed of the web 52 by the take-up roll 76 is faster than the moving speed of the web 52. At this time, the moving speed of the web 52 is slower than the winding speed due to the rotation of the winding shaft 56, but the outer peripheral ring forming the peripheral surface of the winding shaft 58 made of the friction shaft is the shaft core which is the drive input shaft. It rotates with respect to the part, and the drive input shaft runs idle with respect to the peripheral surface. As a result, the web 52 can be wound so as to have the same speed as the moving speed of the sheet in the foil pressing section P while keeping the web 52 stretched.

The foil pressing ultraviolet lamp 66 is provided above the web transport path between the first nip roller 62 and the second nip roller 64.

The first nip roller 62, the second nip roller 64, the ultraviolet lamp 66 for stamping foil, and some guide rollers 60 are configured to be movable up and down between the lowering position of FIG. 6 and the ascending position of FIG. 7, respectively. The ascending position is a position where the web 52 cannot come into contact with the sheet being conveyed. The lowering position is a position where the web 52 is a sheet being conveyed and can come into contact with a sheet adjacent to and parallel to the web 52. For example, the control device 20 positions the nip roller or the like in the ascending position when the sheet is not foil-pressed (that is, when only varnish is applied to the sheet), and positions the nip roller or the like in the descending position when the sheet is foil-pressed.

Of the plurality of guide rollers 60 that define the web transport path on the upstream side of the foil pressing section P, the guide roller (hereinafter, also referred to as the guide roller 60c) located immediately upstream of the first nip roller 62 is the first nip roller 62. It is arranged close to the above and moves up and down together with the first nip roller 62 between the descending position shown in FIG. 6 and the ascending position shown in FIG. 7. Further, among the plurality of guide rollers 60 that define the web transport path on the downstream side of the foil pressing section P, the guide roller (hereinafter, also referred to as the guide roller 60d) located immediately downstream of the second nip roller 64 is the second. It is arranged close to the nip roller 64 and moves up and down together with the second nip roller 64 between the descending position shown in FIG. 6 and the ascending position shown in FIG. 7. By providing a guide roller 60 that is arranged close to the nip rollers 62 and 64 and moves up and down together with the nip rollers 62 and 64, such as the guide roller 60c and the guide roller 60d, the configuration does not include such a guide roller 60. It is possible to prevent the web 52 from wrinkling.

The sheet detection sensor 77 is a sensor that detects the transfer timing in the foil pressing section P. The sheet detection sensor 77 detects the presence or absence of the sheet at the detection position, and can detect the passing timing of the front end and the passing timing of the rear end of the sheet based on the detection result. When the nip roller or the like is in the ascending position, the nip roller or the like is moved toward the descending position at a predetermined timing after detecting that the tip of the sheet for stamping the foil has passed the detection position of the sheet detection sensor 77. Further, after detecting that the rear end of the sheet to be foil-pressed has passed the detection position of the sheet detection sensor 77, the nip roller or the like is moved from the descending position to the ascending position at a predetermined timing as necessary.

FIG. 8 is an enlarged view showing the periphery of the foil stamping section P. Although the display is omitted in FIGS. 6 and 7, the foil pressing device 16 includes a sheet transfer guide that supports the sheet and guides the sheet transfer. At least a part of the sheet transport guide 82 corresponding to the foil pressing section P (that is, provided below the foil pressing section P) is a first nip point N1 at the upstream end and a second nip point at the downstream end of the foil pressing section P. It projects upward from the nip line L passing through N2. The first nip point N1 is a point between the first nip roller 62 in the descending position and the transport roller 54 facing the first nip roller 62 in the descending position, and faces the rotation axis of the first nip roller 62 in the descending position in the upper and lower directions. It exists on a line segment connecting the rotating shaft of the conveying roller 54. The second nip point N2 is a point between the second nip roller 64 in the descending position and the transport roller 54 vertically opposed to the second nip roller 64, and is vertically opposed to the rotation axis of the second nip roller 64 in the descending position. It exists on a line segment connecting the rotating shaft of the conveying roller 54.

As described above, since the varnish in the semi-cured state has a tack property, it is sandwiched between the first nip roller 62 and the transport roller 54, and the foil held by the web 52 adheres to the varnish. However, if the sheet is separated from the web 52 while being conveyed in the foil pressing section P due to the stiffness of the sheet, for example, the varnish may be hardened with the foil that could not be adhered peeled off from the varnish, and the transfer may fail. On the other hand, since at least a part of the sheet transport guide 82 projects upward from the nip line L, the sheet is pressed against the web 52 in the foil pressing section P, the degree of adhesion between the sheet and the web 52 is increased, and the foil is formed. It is prevented from peeling off from the varnish.

The material of the sheet transport guide 82 is not particularly limited, but a material having high heat dissipation and heat resistance such as metal is preferable because ultraviolet rays from the ultraviolet lamp 66 for stamping foil are irradiated. Among the light sources that irradiate ultraviolet rays that can be used for the ultraviolet lamp 66 for foil pressing, ozone is generated at the time of irradiation depending on the type of wavelength of the ultraviolet rays to be irradiated. When a light source that generates ozone during irradiation is used as the foil pressing ultraviolet lamp 66, it is preferable that the material of the sheet transport guide 82 has ozone resistance.

The sheet transport guide 82 is not particularly limited as long as it is a guide that supports the sheet, and may be a plate, a block, or a roller. In the illustrated example, the sheet transport guide 82 is a plate that is curved upward. The sheet transport guide 82 preferably projects at least partly above the nip line L in the irradiation range of the foil pressing ultraviolet lamp 66.

FIG. 9 is a further enlarged view of the periphery of the sheet transport guide 82 shown in FIG. 8 (ultraviolet lamp 66 for foil pressing is omitted in FIG. 9). When the web 52 is stretched without the sheet transport guide 82, the path of the web 52 between the first nip point N1 at the upstream end of the foil pressing section P (transfer section) and the downstream end, that is, the tensioning line is nip. Matches line L. That is, at least a part of the sheet transport guide 82 projects upward from the tension line. Therefore, since the web 52 is pushed up by the sheet transport guide 82, it actually becomes the route shown by the thick line in FIG.

The sheet transport guide 82 has an upper surface 82x formed by an upwardly convex curved surface. The web 52 has an upwardly convex curved surface in the range C1 in contact with the upper surface 82x, similarly to the upper surface 82x. The sheet passes between the web 52 and the top surface 82x in this range C1. Then, the tip of the sheet always faces the tangential direction in the transport direction Y of the curved sheet forming the upper surface 82x in this range C1. This tangential direction is a direction toward the outside of the curved surface forming the upper surface 82x, that is, a direction intersecting the path of the web 52. For example, when the tip of the sheet reaches a predetermined position D1 in the range C1, the tip of the sheet faces the tangential direction D2. Therefore, the tip side directional portion is formed so that the tip end side of the sheet faces the direction intersecting the transfer web path in the foil pressing section P over the entire range C1.

Further, in this range C1, the rear end of the sheet always faces the tangential direction in the transport direction Y of the curved sheet forming the upper surface 82x in this range C1. This tangential direction is a direction toward the outside of the curved surface forming the upper surface 82x, that is, a direction intersecting the path of the web 52. For example, when the rear edge of the sheet reaches a predetermined position D3 in the range C1, the rear edge of the sheet faces the tangential direction D4. Therefore, a rear end side directional portion is formed so that the rear end side of the sheet faces the direction intersecting the transfer web path in the foil pressing section P over the entire range C1.

When the first nip roller 62 and the second nip roller 64 are in the raised position, the web 52 is separated from the sheet transport guide 82 as shown in FIG. 13A. When the web 52 moves to the lowered position, the web 52 comes into contact with the sheet transport guide 82 as shown in FIG. The front end side directional portion and the rear end side directional portion are formed when they are in this descending position.

This movement to the lowering position may be performed after a part of the sheet near the tip of the sheet enters the foil pressing section P. For example, when the varnish coating region R formed only near the rear end of the sheet is moved to the descending position at the timing of entering the foil pressing section P. In such a case, the first nip roller 62 and the second nip roller 64 move to the descending position while a part of the sheet is already in the foil pressing section P, and the tip side pointing portion is formed. At that time, at the position D1, the tip end side of the passing sheet faces the tangential direction D2. Therefore, in the tip-side directional portion, the tip-side of the passing sheet faces in the direction intersecting the path of the web 52.

Further, the movement to the ascending position may be performed before a part of the sheet near the rear end exits the foil pressing section P. For example, there is a case where the varnish coating region R formed only near the front edge of the sheet is moved to the ascending position in accordance with the timing of exiting the foil pressing section P. In such a case, the first nip roller 62 and the second nip roller 64 move to the ascending position while a part of the sheet still remains in the foil pressing section P, and the rear end side directional portion is eliminated. Until just before the resolution, at the position D3, the rear end side of the passing sheet faces the tangential direction D4. Therefore, in the rear end side directional portion, the rear end side of the passing sheet faces in the direction intersecting the path of the web 52.

FIG. 10 is an enlarged view showing the periphery of the foil pressing section P, and shows another example of the sheet transport guide 82. In this example, the sheet transport guide 82 is a block and has a flat upper surface (horizontal plane) 82a protruding above the nip line L in the irradiation range of the foil pressing ultraviolet lamp 66.

FIG. 11 is a further enlarged view of the periphery of the sheet transport guide 82 shown in FIG. 10 (the ultraviolet lamp 66 for foil pressing is omitted in FIG. 11). When the web 52 is stretched without the sheet transport guide 82, the path of the web 52, that is, the tension between the first nip point N1 at the upstream end of the foil pressing section P (transfer section) and the second nip point N2 at the downstream end. The overhead line coincides with the nip line L. Therefore, the upper surface (horizontal plane) 82a of the sheet transport guide 82 projects upward from the tension line.

The sheet transport guide 82 further has an ascending slope 82b that is continuous with the upstream end of the upper surface 82a in the transport direction Y and forms an ascending slope in the transport direction Y. Further, the sheet transport guide 82 has a down slope 82c that is continuous with the downstream end portion of the upper surface 82a in the transport direction Y and forms a down slope in the transport direction Y.

The web 52 is pushed up by the sheet transport guide 82 and becomes the path shown by the thick line in FIG. That is, the web 52 first forms an ascending gradient 52a from the first nip point N1 to the second nip point N2, and reaches the upstream end of the upper surface 82a in the transport direction Y. Subsequently, a horizontal path is formed in contact with the upper surface 82a up to the downstream end of the upper surface 82a in the transport direction Y. Subsequently, a downward gradient 52b is formed to reach the second nip point N2.

When the sheet is relatively weak and a semi-cured varnish is applied on the sheet near the tip of the sheet, the tackiness of the varnish causes the sheet to be adhered to the web 52, so that the tip of the sheet is Proceed along the upslope 52a of the web 52. At that time, when the sheet reaches the predetermined position D5, the tip of the sheet faces the same direction D6 as the uphill slope 52a. Since the web 52 is horizontal on the downstream side of the transport direction Y, the direction D6 intersects the path of the web 52. Therefore, in the uphill slope 52a, a tip-side directional portion is formed so that the tip-side in the transport direction of the sheet to be transported faces the direction intersecting the path of the web 52.

If the sheet is relatively strong, or even if the sheet is relatively weak, the semi-cured varnish is not applied to the sheet near the tip of the sheet, the tip of the sheet is along the nip line L. Proceed and abut on the ascending slope 82b. After that, the tip of the sheet goes up the slope along the uphill slope 82b. At that time, when the sheet reaches the predetermined position D7, the tip of the sheet faces the direction D8 which is an extension of the line connecting the first nip point N1 and the position D7. When the direction D8 is extended, it intersects the path of the web 52. Therefore, on the ascending slope 82b, a tip-side directional portion is formed so that the tip-side in the transport direction of the sheet to be transported faces the direction intersecting the path of the web 52.

If the sheet is relatively weak and a semi-cured varnish is applied on the sheet near the rear edge of the sheet, the tackiness of the varnish causes the sheet to adhere to the web 52, so that the sheet is after the sheet. The edge travels along the down slope 52b of the web 52. At that time, when the sheet reaches the predetermined position D9, the rear end of the sheet faces the same direction D10 as the downward slope 52b. Since the web 52 is horizontal on the upstream side of the transport direction Y, the direction D10 intersects the path of the web 52. Therefore, in the downward slope 52b, a rear end side directional portion is formed so that the rear end side of the sheet to be transported in the transport direction faces the direction intersecting the path of the web 52.

If the sheet is relatively strong, or even if the sheet is relatively weak, the semi-cured varnish is not applied to the sheet near the rear end of the sheet, the rear end of the sheet is conveyed to the upper surface 82a. After passing the downstream end in the direction Y, it goes down the slope along the down slope 82c away from the web 52. At that time, when the seat reaches the predetermined position D11, the rear end of the seat faces the direction D12 which is an extension of the line connecting the position D11 and the second nip point N2. When the direction D12 is extended, it intersects the path of the web 52. Therefore, on the downhill slope 82c, a rear end side directional portion is formed so that the rear end side of the sheet to be transported in the transport direction faces the direction intersecting the path of the web 52.

When the first nip roller 62 and the second nip roller 64 are in the raised position, the web 52 is separated from the sheet transport guide 82 as shown in FIG. 13 (b). When the web 52 moves to the lowered position, the web 52 comes into contact with the sheet transport guide 82 as shown in FIG. The front end side directional portion and the rear end side directional portion are formed when they are in this descending position.

Even if the movement to the lowering position is performed after a part of the sheet near the tip of the sheet enters the foil pressing section P, if the tip of the sheet reaches the upper surface 82a at the time of lowering, the sheet passes at the position D5. The tip side of the sheet inside faces direction D6. Therefore, in the tip-side directional portion, the tip-side of the passing sheet faces in the direction intersecting the path of the web 52. If the tip of the sheet has not reached the upper surface 82a at the time of lowering, the tip of the sheet abuts on the slope 82b, climbs the slope 82b, and faces the direction D8 when the position D7 is reached. Therefore, in the tip side directional portion, the tip end side of the seat faces in the direction intersecting the path of the web 52.

Further, even if the movement to the ascending position is performed before a part near the rear end of the sheet exits the foil pressing section P, if the rear end of the sheet remains on the upper surface 82a at that time, until just before that. At position D9, the rear end side of the passing sheet faces direction D10. Therefore, in the rear end side directional portion, the rear end side of the passing sheet faces in the direction intersecting the path of the web 52. If the front end of the sheet has not reached the upper surface 82a at the time of ascending, the rear end of the sheet abuts on the slope 82c, descends the slope 82c, and faces the direction D12 when the position D11 is reached. Therefore, in the rear end side directional portion, the rear end side of the sheet faces in the direction intersecting the path of the web 52.

In the examples of FIGS. 9 and 11, a roller member may be used instead of the sheet transport guide 82. That is, the roller member is arranged so that at least a part thereof projects upward from the nip line L passing through the first nip point N1 at the upstream end and the second nip point N2 at the downstream end of the foil pressing section P. As a result, the web 52 is pushed up on the outer peripheral surface thereof.

For example, as the roller members, rollers having the same diameter may be arranged at the same height as each other at intervals in the transport direction Y. In this case, the outer peripheral surface of the roller member arranged on the upstream side in the transport direction Y has a tip-side directional portion formed at a portion pushing up the web 52, and the roller member arranged on the downstream side in the transport direction Y is formed. A rear end side directional portion is formed at a portion where the outer peripheral surface pushes up the web 52.

Further, as the roller member, one roller having a relatively large diameter may be arranged between the first nip point N1 and the second nip point N2. In this case, as in the example of FIG. 9, the front end side directional portion and the rear end side directional portion are formed over the entire curved surface of the outer peripheral surface of the roller member that is in contact with the web 52 and pushed up.

FIG. 12 is an enlarged view showing the periphery of the foil stamping section P of yet another example (the foil stamping ultraviolet lamp 66 is omitted in FIG. 12). In this example, the seat support guide 83 is provided. The seat support guide 83 has a flat upper surface 83a. The upper surface 83a is a horizontal plane and coincides with the transport lower surface line L2 connecting the uppermost surfaces of the outer peripheral surfaces of the transport rollers 54 facing the nip rollers 62 and 64, respectively. In the example of FIG. 12, the transport roller 54 facing below the nip roller 62 is also referred to as a transport roller 54a, and the transport roller 54 facing below the nip roller 64 is also referred to as a transport roller 54b.

The seat support guide 83 further has an ascending slope 83b that is continuous with the upstream end of the upper surface 83a in the conveying direction Y and forms an ascending slope in the conveying direction Y. Further, the sheet transport guide 83 has a bent-back portion 83c that is continuously bent downward and in the direction opposite to the transport direction Y, continuous with the downstream end portion of the upper surface 83a in the transport direction Y.

The web 52 is the route shown by the thick line in FIG. That is, the web 52 is horizontally stretched between the nip rollers 62 and 64. The height positions of the nip rollers 62 and 64 are set so that the web 52 is stretched with a gap D13 with respect to the upper surface 83a of the seat support guide 83. The gap D13 has a value slightly smaller than the thickness of the sheet to be transferred. The heights of the nip rollers 62, 64 may be adjustable depending on the thickness of the sheet applied.

The axis of the transfer roller 54a is offset to the downstream side in the transfer direction Y by a distance D14 with respect to the axis of the nip roller 62. The height difference D15 between the axis of the transfer roller 54a and the axis of the nip roller 62 is a value obtained by adding the distance D13 to the sum of the radius of the transfer roller 54a and the radius of the nip roller 62.

When the tip of the sheet is pressure-pinched by the transfer roller 54a and the nip roller 62, the tip of the sheet is centered on the axis of the transfer roller 54a and the nip roller 62 due to the offset in the transfer direction Y between the transfer roller 54a and the nip roller 62. It faces the direction D17 which is substantially orthogonal to the connecting line D16. Direction D17 intersects the path of the web 52. Therefore, in the region sandwiched between the transport roller 54a and the nip roller 62, a tip side directional portion is formed so that the tip side of the sheet to be transported in the transport direction faces the direction intersecting the path of the web 52.

The axis of the transfer roller 54b is offset to the upstream side in the transfer direction Y by a distance D18 with respect to the axis of the nip roller 64. In the example of FIG. 12, the distance D18 is the same as the distance D14, but is not limited to the same. The height difference D19 between the axis of the transfer roller 54b and the axis of the nip roller 64 is a value obtained by adding the distance D13 to the sum of the radius of the transfer roller 54b and the radius of the nip roller 64.

Immediately before the rear end of the sheet is released from the pressure holding between the transfer roller 54b and the nip roller 64, due to the offset of the transfer roller 54b and the nip roller 64 in the transfer direction Y, the rear end of the sheet is the axis of the transfer roller 54b and the nip roller 64. It faces the direction D21 which is substantially orthogonal to the line D20 connecting the hearts. Direction D21 intersects the path of the web 52. Therefore, in the region sandwiched between the transport roller 54b and the nip roller 64, a rear end side directional portion is formed so that the rear end side of the sheet to be transported in the transport direction faces the direction intersecting the path of the web 52. There is.

The distance D13 is smaller than the thickness of the sheet, and when the sheet enters between the transfer rollers 54a and 54b and the nip rollers 62 and 64, the distance D13 and the web 52 along the outside of the transfer rollers 54a and 54b and the nip rollers 62 and 64 It is set to such an extent that it can move forward in the transport direction Y between the two while being pressed and sandwiched between the two. Further, in the portion between the nip roller 62 and the nip roller 64, the seat is supported from below by the seat support guide 83, so that the seat is prevented from escaping downward. Therefore, the contact between the sheet and the web 52 can be promoted in the entire foil pressing section P.

When the first nip roller 62 and the second nip roller 64 are in the raised position, the web 52 is largely separated from the seat support guide 83 as shown in FIG. 13 (c). When moved to the lowered position, as shown in FIG. 12, the web 52 and the upper surface 83a of the seat support guide 83 are separated by a distance D13. The front end side directional portion and the rear end side directional portion are formed when they are in this descending position.

Even if this movement to the lowering position is performed after a part of the sheet near the tip of the sheet enters the foil pressing section P, at the position D16, the tip side of the passing sheet faces the direction D17. Therefore, in the tip-side directional portion, the tip-side of the passing sheet faces in the direction intersecting the path of the web 52.

Further, even if the movement to the ascending position is performed before a part of the rear end side of the sheet leaves the foil pressing section P, the rear end side of the passing sheet faces the direction D21 at the position D20 until just before that. Therefore, in the rear end side directional portion, the rear end side of the passing sheet faces in the direction intersecting the path of the web 52.

As a modification of the example of FIG. 12, the transport roller 54a may be arranged slightly above the example of FIG. That is, the height difference D15 between the axis of the transfer roller 54a and the axis of the nip roller 62 is slightly smaller than the sum of the radius of the transfer roller 54a and the radius of the nip roller 62 plus the distance D13. You may do so. By arranging in this way, the tip of the sheet inserted between the transport roller 54a and the nip roller 62 faces further upward than the direction D17. Therefore, the directivity of the tip side directivity portion can be enhanced.

Similarly, the transport roller 54b may be arranged slightly above the example of FIG. That is, the height difference D19 between the axis of the transfer roller 54b and the axis of the nip roller 64 is slightly smaller than the sum of the radius of the transfer roller 54b and the radius of the nip roller 64 plus the distance D13. You may do so. By arranging in this way, the rear end of the sheet that has entered between the transport roller 54b and the nip roller 64 faces further upward than the direction D21. Therefore, the directivity of the rear end side directivity portion can be enhanced.

When the tension line of the web 52 and the upper surface of the sheet to which the foil is to be transferred are completely parallel, even if the web 52 is designed to come into contact with the upper surface of the sheet, it is slightly separated due to component error or the like. There is a problem that the contact pressure is not sufficient even if they are in contact with each other, and transfer failure occurs. However, in each of the examples of FIGS. 9, 11 and 12, since the tip end side of the sheet faces the direction of intersecting the foil path in the tip end side pointing portion, pressure contact between the sheet and the foil is promoted on the tip end side of the sheet. Is done. Further, since the rear end side of the sheet faces the direction intersecting the path of the foil in the rear end side directional portion, pressure contact between the sheet and the foil is promoted on the rear end side of the sheet. Therefore, the sheet and the foil can be reliably pressed against each other, and the foil can be reliably transferred to the sheet.

The front end side directional portion and the rear end side directional portion may have both, or may have only one of them. Further, in the case of a thin sheet, the sheet may stand by with the gap D13 set to zero, that is, the web 52 is in contact with the upper surface 83a of the seat support guide 83. Further, if the gap D13 is smaller than the thickness of the sheet, the upper surface 83a may be lower than the transport lower surface line L2.

The above is the detailed configuration of the foil pressing device 16. Next, the operation of the foil pressing device 16 will be described.

14 (a) to 14 (f) are views for explaining the feed back by the foil pressing device 16. 14 (a) to 14 (f) show the send-back scenes in chronological order. In FIGS. 14A to 14D, the solid web 52 indicates an unused web, and the dotted web 52 indicates a used web.

In FIG. 14A, the sheet S1 is passing through the foil pressing section P, and the foil is transferred from the web 52 to the varnish coating region R on the sheet S1. As shown in FIG. 14B, the feeding of the web 52 is stopped at the timing when the rear end (upstream end in the transport direction Y) of the varnish coating region R on the sheet S1 reaches the downstream end of the foil pressing section P. The control device 20 may specify the timing at which the rear end of the varnish application region R on the sheet S1 reaches the downstream end of the foil pressing section P based on the varnish discharge data.

As shown in FIG. 14 (c), the nip roller or the like is moved to the ascending position to separate the web 52 from the sheet S1 and the transport roller 54 (not shown). In FIG. 14D, the guide rollers 60a and 60b are moved to the upstream side in the transport direction Y. As shown in FIG. 14E, the nip roller or the like is moved so that the front end of the varnish coating region R of the next sheet S2 is located at the lowering position at the timing when it reaches the upstream end of the foil pressing section P. By the operation of FIGS. 14C to 14E, at least a part of the web 52 existing in the foil pressing section P is returned to the upstream side of the foil pressing section P. That is, the sending back is realized. Preferably, the web 52 located at the downstream end of the foil stamping section P is specifically returned to the upstream side of the foil stamping section P so that all of the unused webs 52 existing in the foil stamping section P are returned to the upstream side of the foil stamping section P. The feedback is realized so that it is located at the upstream end of P.

In FIG. 14 (f), the sheet S2 is passing through the foil pressing section P, and the foil is transferred from the web 52 to the varnish coating region R on the sheet S1. At this time, by first moving the guide rollers 60a and 60b to the downstream side in the transport direction Y, the web 52 existing upstream of the foil pressing section P is foil pressed in FIGS. 14 (b) and 14 (c). The web 52 existing in the section P is sent to the foil stamping section P. After moving the guide rollers 60a and 60b to a predetermined position (for example, the limit of the movable range on the downstream side in the transport direction Y), the web 52 is unwound from the unwinding roll 74 (not shown in FIG. 14) to reach the foil pressing section P. Send the web.

Since the web transport path becomes shorter when the nip roller or the like is raised in FIG. 14C, the nip roller or the like may be raised while winding the web 52 with the take-up roll 76 so that the web 52 does not loosen. .. In this case, the web 52 may be unwound from the unwinding roll 74 when the nip roller or the like is lowered in FIG. 14E, that is, the transport path becomes long. Since the unused web 52 is slightly sent out to the foil pressing section P by this unwinding, the guide rollers 60a and 60b may be moved in FIG. 14D in consideration of that amount.

The present invention has been described above based on the embodiments. This embodiment is an example, and it will be understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present invention. be. Hereinafter, such a modification will be described.

(Modification example 1)
15 (a) and 15 (b) are views showing the state of foil pressing. In this example, there are a plurality of varnished regions Ri (i = 1, ... N) on the sheet. In this case, as shown in FIGS. 15 (a) and 15 (b), the contact is in contact with the region Rb-k between the varnish-applied region R-k (k = 1, ... N-1) and the varnish-applied region R-k + 1. The web 52 that had been used becomes unused.

In FIG. 15A, the length of the region Rb-1 in the transport direction Y is equal to or less than the length of the foil pressing section P. In this case, when the rear end of the varnish coating region R-1 reaches the downstream end of the foil pressing section P, the varnish coating region R-2 has already reached the foil pressing section P. In this case, since it cannot be sent back, the web 52 that has been in contact with the region Rb-k is wound up by the take-up roll 76 in an unused state.

In FIG. 15B, the length of the region Rb-1 in the transport direction Y exceeds the length of the foil pressing section P. In this case, when the rear end of the varnish coating region R-1 reaches the downstream end of the foil pressing section P, the varnish coating region R-2 has not yet reached the foil pressing section P. In this case, the web 52 that was in contact with the region Rb-k can be used by sending back.

Specifically, the control device 20 identifies that the two varnish application regions R-1 and R-2 exist based on the varnish discharge data at a predetermined timing of the start of the job. Next, it is confirmed whether or not the length of the region Rb-1 between the two varnished regions R-1 and R-2 exceeds the length of the foil pressing section P. If the length of the region Rb-1 is less than or equal to the length of the foil stamping section, the region Rb-1 is not sent back. When the length of the region Rb-1 exceeds the length of the foil pressing section, the feeding of the web 52 is stopped at the timing when the rear end of the varnished region R-1 reaches the downstream end of the foil pressing section P, and the region Rb-1 is stopped. Send back the web 52 corresponding to -1.

According to this modification, wasteful consumption of the foil can be further reduced.

(Modification 2)
In the embodiment, the case where the guide roller 60a and the guide roller 60b are connected via the bracket 80 and driven by a single driving device has been described, but the present invention is not limited to this. The guide roller 60a and the guide roller 60b may not be connected to each other and may be driven by separate driving devices. In this case, the guide roller 60a and the guide roller 60b are moved so that the transport path on the upstream side of the foil pressing section P is longer and the guide roller 60b is moved so that the transport path on the downstream side is shorter. Should be linked with.

(Modification example 3)
In the embodiment, the feed back is realized by moving the guide roller 60a on the upstream side and the guide roller 60b on the downstream side of the foil pressing section P, but the feed back is realized by moving only the guide roller 60a on the upstream side, that is, Sendback may be realized by increasing or decreasing only the transport path on the upstream side. More specifically, the feed back may be realized by unwinding the used web 52 from the take-up roll 76 while moving the guide roller 60a so that the transport path on the upstream side becomes longer. In this case, the outer ring of the friction shaft of the take-up shaft 58 rotates in the direction opposite to that at the time of take-up.

(Modification example 4)
Instead of the guide rollers 60a and 60b, a simple guide that does not rotate may be provided. In this case, the guide surface is preferably formed with low friction.

(Modification 5)
The technical idea of the embodiment is not limited to the case where the foil is transferred to the sheet. That is, the transferred object to which the foil pressing device 16 transfers the foil may be other than the sheet.

(Modification 6)
The transfer substance held by the web 52 and transferred in the transfer section such as the foil pressing section P is not limited to a thinly stretched metal called “foil”, and may be a thin layer other than metal. Further, a transfer substance such as ink may be applied to the web, which is a substrate, such as an ink ribbon. Further, the long base material sheet that supports the transfer substance is not limited to the film, and may be any one that holds the transfer substance such as a strip-shaped woven cloth and can be transferred to the object to be transferred in the transfer section.

Any combination of the embodiments and modifications described above is also useful as an embodiment of the present invention. The new embodiments resulting from the combination have the effects of the combined embodiments and variants. It is also understood by those skilled in the art that the functions to be fulfilled by each of the constituent elements described in the claims are realized by a single component or a combination thereof shown in the embodiments and modifications. .. For example, the transport system according to claim is realized by a combination of a take-up shaft 56, a take-up shaft 58, a plurality of guide rollers 60, nip rollers 62 and 64, and a sheet detection sensor 77. Further, the transfer means according to the claim is realized by a combination of nip rollers 62, 64, a transport roller 54 facing the nip rollers 62, 64, and an ultraviolet lamp 66 for foil pressing. Further, the web transport route changing mechanism according to claim is realized by a combination of guide rollers 60a and 60b, a bracket 80, and a drive device (not shown) for moving the bracket 80.

10 Printing system 16 Foil stamping device 52 Web 74 Unwinding roll 82 Sheet transfer guide 83 Sheet support guide
??

Claims (11)

A transfer web having a transfer substance held on the substrate sheet is hung along a predetermined path, and in a transfer section that is a part of the predetermined path, the transfer web is brought into contact with a sheet-shaped object to be transferred. In a transfer device that transfers the transfer substance to the transfer object,
A tip-side directional portion is formed at a predetermined position on the transport path of the transfer target in the transfer section so that the tip end side of the transfer target at the predetermined position faces the direction intersecting the transfer web path in the transfer section. A transfer device characterized by being A transfer web having a transfer substance held on the substrate sheet is hung along a predetermined path, and in a transfer section that is a part of the predetermined path, the transfer web is brought into contact with a sheet-shaped object to be transferred. In a transfer device that transfers the transfer substance to the transfer target, the transfer web path in the transfer section is located at a predetermined position on the transfer path of the transfer target in the transfer section, and the rear end side of the transfer target at the predetermined position. A transfer device, characterized in that a rear end side directional portion is formed at the predetermined position so as to face a direction intersecting with the above. A transfer web having a transfer substance held on the substrate sheet is hung along a predetermined path, and in a transfer section that is a part of the predetermined path, the transfer web is brought into contact with a sheet-shaped object to be transferred. In a transfer device that transfers the transferred substance to the transferred object, the tip side of the transferred object at the first predetermined position is transferred to the first predetermined position of the transfer path of the transferred object in the transfer section. A tip-side pointing section is formed that points in a direction that intersects the path of the web.
After making the rear end side of the object to be transferred at the second predetermined position at the second predetermined position of the transport path of the object to be transferred in the transfer section point in a direction intersecting the path of the transfer web in the transfer section. A transfer device characterized in that an end-side directional portion is formed. Includes an upstream nip roller pair located at the upstream end of the transfer section and sandwiching both the transfer web and the object to be transferred.
Of the upstream nip roller pairs, the axis of the roller on the transfer object side is located downstream of the axis of the transfer web side roller in the transport direction.
The transfer device according to claim 1 or 3, wherein the tip-side directional portion is a nip portion of a pair of upstream nip rollers. Includes a pair of downstream nip rollers located at the downstream end of the transfer section and sandwiching the transfer web and the object to be transferred together.
Of the downstream nip roller pairs, the axis of the roller on the transfer object side is located on the upstream side in the transport direction with respect to the axis of the transfer web side roller.
The transfer device according to claim 2 or 3, wherein the rear end side directional portion is a nip portion of the downstream side nip roller pair. It has a sheet support guide having a support guide surface for supporting the material to be transferred carried in the transfer section from below.
Any of claims 1 to 5, wherein the gap between the support guide surface and the tension line when the transfer web is stretched within the transfer section is smaller than the thickness of the material to be transferred. The transfer device according to. It has a sheet support transfer guide having a support guide surface that supports the transferred object transferred in the transfer section from below.
The transfer device according to any one of claims 1 to 5, wherein the support guide surface coincides with a tension line when the transfer web is stretched within the transfer section. A sheet transfer guide having a transfer guide surface that supports the transferred object to be transferred in the transfer section from below is included.
On the transport guide surface, a protruding portion in which the transport guide surface protrudes upward from the tension line when the transfer web is stretched without the sheet transport guide is formed at least in a part in the transport direction. And
The transfer device according to claim 1 or 3, wherein the tip-side directional portion is formed at least at the upstream end portion of the protruding portion. A sheet transfer guide having a transfer guide surface that supports the transferred object to be transferred in the transfer section from below is included.
On the transport guide surface, a protruding portion in which the transport guide surface protrudes upward from the tension line when the transfer web is stretched without the sheet transport guide is formed at least in a part in the transport direction. And
The transfer device according to claim 2 or 3, wherein the rear end side directional portion is formed at least at the downstream end portion of the protruding portion. 1. The transfer device described. It is a foil pressing device that transfers foil from a foil holding film in which foil is laminated on a film to an object to be transferred and presses the foil.
A foil pressing device according to any one of claims 1 to 10, wherein the foil is transferred from the foil holding film to the object to be transferred.

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