JP2008093598A - Coater and printing machine using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coater which controls a retention of a varnish and allows an attempt of stabilizing the quality of the varnish coating. <P>SOLUTION: A coating unit 7 has a reservoir 43 for a varnish and a varnish original roller 29 with the lower part immersed in the varnish stored in the reservoir 43 which carries the varnish to the upstream side through rotation. A bottom plate 47, arranged opposite the varnish original roller 29 of the reservoir 43, is bent along the contour of the lower side of the varnish original roller 29. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating apparatus and a printing machine using the same.

In general, a varnish coating apparatus that coats paper with varnish is known in order to prevent the printed paper from being damaged or to improve the appearance.
In this varnish coating apparatus, as shown in Patent Document 1, a varnish stored in a varnish boat is conveyed by at least one roller and applied to a printing surface of printing paper.
In general, since the solvent contained in the varnish evaporates with time, the varnish in the varnish boat has a high concentration and may have a high viscosity. When the viscosity of the varnish becomes high, it becomes difficult to apply the varnish to the paper with a constant film thickness, which causes a problem that the quality of the varnish coating is deteriorated.
The device described in Patent Document 1 is configured to supply and collect varnish from the bottom of a box-type varnish boat, and attempts to maintain the concentration of varnish by circulating and using the varnish.

Japanese Patent Laid-Open No. 03-244544

However, in what is disclosed in Patent Document 1, a region where the varnish stays is easily formed outside the portion where the varnish is supplied and recovered, that is, the lower four sides of the varnish boat, and the concentration of the varnish in the staying region. Further, there is a problem that the viscosity becomes high and the quality of the varnish coating is lowered.
In addition, when the varnish having such a high viscosity is supplied to the roller, there is a problem that the varnish of the portion is not transferred to the paper, so that so-called varnish jump is likely to occur, and print quality is deteriorated.
Furthermore, since the varnish that gives gloss after coating and the varnish with high drying properties tend to be high in viscosity, there is a problem that the above-mentioned problem becomes more remarkable when coating with higher quality is performed. .

  In view of the above problems, an object of the present invention is to provide a coating apparatus capable of suppressing varnish retention and stabilizing the varnish coating quality, and a printing machine using the same.

In order to solve the above problems, the present invention employs the following means.
That is, a coating apparatus according to the present invention includes a storage unit that stores a coating liquid, a supply roller that has a lower part immersed in the coating liquid stored in the storage unit, and transports the coating liquid downstream by rotation, A bottom surface portion of the storage portion facing the supply roller and storing the coating liquid is formed in a curved surface so as to substantially follow the lower shape of the supply roller. It is characterized by being.

According to the coating apparatus of the present invention, the coating liquid stored in the storage unit is pumped up by being attached to the surface of the supply roller by being immersed in the coating liquid at the lower portion and rotating the supply roller, and is conveyed downstream. The
At this time, the bottom surface portion that is disposed opposite to the supply roller of the storage portion and stores the coating liquid is formed in a curved surface so as to substantially follow the lower shape of the supply roller. This distance is substantially the same across the entire bottom surface, in other words, is substantially equal.
If the distance between the surface and the bottom surface of the supply roller is substantially equal, the flow of the coating liquid is likely to become a laminar flow, and thus the coating liquid is less likely to stay. In other words, since there is no corner in the width direction in which turbulent flow is likely to cause the coating liquid to stay, the coating liquid is more difficult to stay. For this reason, the retention of the coating liquid in a storage part can be suppressed.
As described above, if the retention of the coating liquid in the storage unit can be suppressed, it is possible to prevent the coating liquid from increasing in concentration and viscosity, thereby preventing the coating quality from being lowered, and the coating quality can be stabilized.
If the coating solution is circulated and supplied, the stagnation can be further suppressed and the coating quality can be further stabilized.
In this case, it is desirable from the viewpoint of preventing stagnation that the coating liquid is supplied to the upstream side in the rotation direction of the supply roller and is collected from the downstream side.

  In the coating apparatus according to the present invention, a recovery unit that receives the coating liquid dropped from the bottom surface part is provided in a lower part of the storage part.

  As described above, since the recovery unit that receives the coating liquid dropped from the bottom surface part is provided in the lower part of the storage unit, the application liquid that has fallen from the storage unit can be received by the recovery unit. Can prevent damage to the coating device.

  In the coating apparatus according to the present invention, the bottom surface portion is detachably attached to the storage portion.

As described above, since the bottom surface portion is detachably attached to the storage portion, the bottom surface portion can be removed and cleaning can be performed in an easy posture in a wide place.
Further, for example, when the recovery unit is provided at the lower part, the recovery unit can be easily approached by removing the bottom surface part, so that the recovery unit can be easily cleaned.

  Moreover, in the coating apparatus according to the present invention, the bottom surface portion is a plate member having elasticity, and is disposed so as to extend in the direction intersecting the axial direction of the supply roller at both side end portions of the storage portion, An upper guide and a lower guide provided at predetermined intervals in the vertical direction are provided, the upper guide and the lower guide have a curved shape that substantially follows the lower shape of the supply roller, and the plate member is the upper guide It is mounted by being inserted between the guide and the lower guide.

According to the present invention, the bottom surface portion, which is a plate member having elasticity, is inserted into the upper guide and the lower guide at both ends thereof and moved along the upper guide and the lower guide. A curved surface that bends along the shape of the guide and the lower guide and substantially follows the lower shape of the supply roller can be formed.
Further, the bottom portion can be easily removed by pulling it out between the upper guide and the lower guide.
Furthermore, the height position of the insertion side end can be changed by adjusting the insertion amount of the bottom surface portion.
If the height position of the bottom surface portion can be changed, the position of the coating liquid surface where the coating liquid overflows can be adjusted.

  In the coating apparatus according to the present invention, the length of the upper guide along the axial direction of the supply roller is smaller than that of the lower guide.

  Thus, the length of the upper guide along the axial direction of the supply roller is configured to be smaller than that of the lower guide. Therefore, when the bottom surface is removed, the lower guide has a large area open and is easily cleaned. can do.

  A printing machine according to the present invention is a printing machine that prints a predetermined image on paper, and is provided with the coating apparatus according to any one of claims 1 to 5.

  As described above, since the coating apparatus capable of suppressing the varnish retention and stabilizing the varnish coating quality is mounted, it is possible to print a printed matter with improved printing quality.

According to the present invention, the bottom surface portion that is disposed opposite to the supply roller of the storage portion and stores the coating liquid is formed in a curved surface so as to substantially follow the lower shape of the supply roller. The retention of the liquid can be suppressed.
As described above, if the retention of the coating liquid in the storage unit can be suppressed, it is possible to prevent the coating liquid from increasing in concentration and viscosity, thereby preventing the coating quality from being lowered, and the coating quality can be stabilized.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing a schematic configuration of a sheet-fed printing press 1 using a coating unit according to the present embodiment. FIG. 2 is a front view showing a schematic configuration of the coating unit. FIG. 3 is a front longitudinal sectional view showing the varnish boat of FIG. 2. FIG. 4 is a plan view of FIG. FIG. 5 is a side view of FIG.

As shown in FIG. 1, the sheet-fed printing press 1 includes a paper feeding unit 3, a printing unit 5, a coating unit (coating device) 7, and a paper discharge unit 9.
The sheet feeding unit 3 sequentially feeds sheets 13 of the printing material stacked on the sheet feeding table 11 one by one from the uppermost stage to the printing unit 5 in the next process via an intermediate cylinder or the like.
The printing unit 5 includes a plurality of sets of printing units 15a to 15d (indicated by reference numeral 15 when not individually distinguished).
Each printing unit 15 is a unit that performs predetermined printing on the sheet 13. In each printing unit 15, the ink supplied to the ink reservoir (not shown) is appropriately kneaded in the process of sequentially transferring the ink roller group (not shown), and transferred to the printing plate 19 mounted on the plate cylinder 17 as an ink film. Is done.

The ink supplied to the printing plate 19 is transferred to the downstream blanket cylinder 21 as a pattern.
Thereafter, the ink is transferred to the surface of the sheet 13 running between the blanket cylinder 21 and the impression cylinder 23, and predetermined printing is completed. The printed sheet 13 is transferred from the impression cylinder 23 through the intermediate cylinder 25 to the printing unit 15 or the coating unit 7 in the next process.
In addition, since only one color can be printed in one set of printing units 15, in the sheet-fed printing machine 1 that performs multicolor printing, a plurality of sets of printing units 15 a to 15 having different ink colors along the traveling direction 20 of the sheet 13. 15d is configured as a group of printing devices arranged in parallel, and the target multicolor printing is performed by sequentially passing the printing units 15 and overlapping the printing.

The coating unit 7 is generally provided on the downstream side of the printing unit 5, and applies a varnish (coating liquid) for applying gloss to the printing surface of the sheet 13.
As shown in FIG. 2, the coating unit 7 includes a varnish boat 27, a varnish roller (supply roller) 29, a varnishing roller 31, a plate cylinder 33, and an impression cylinder 35.
The varnishing roller 29, the varnishing roller 31, the plate cylinder 33, and the impression cylinder 35 rotate in the directions of the arrows shown in FIG. 2 during the printing operation so as to supply the varnish to the sheet 13 conveyed by the impression cylinder 35. It is configured.

Between the varnish boat 27 and the plate cylinder 33, a two-roller configuration of a varnish original roller 29 and a varnishing roller 31 is provided, so that the roller diameter is larger than that of three or more rollers. And varnish scattering can be reduced.
Further, since the effect of kneading the varnish is reduced, a thick varnish can be supplied, and the adjustment range of the varnish amount can be expanded.

The varnish boat 27 will be described with reference to FIGS.
The varnish boat 27 includes a storage unit 43 that stores varnish, and a recovery unit 45 that receives and recovers the varnish falling from the storage unit 43.
The storage portion 43 includes a bottom plate (bottom surface portion) 47, a pair of side plates 49, a mounting member 51, a pair of upper guides 53, and a pair of lower guides 55.
The attachment member 51 is a plate material made of stainless steel, and is bent so that a fold substantially perpendicular to the longitudinal direction is formed. The longitudinal direction of the attachment member 51 extends in the width direction of the coating unit 7, and the surface is the rear (hereinafter, the upstream side with respect to the traveling direction 20 of the sheet 13 is referred to as “rear”, and the downstream side is referred to as “front”. It is arranged so as to be formed in a part and an upper part.
A plurality of, for example, four hooks 57 for attachment (positioning) are attached to the lower rear portion of the attachment member 51.

The pair of side plates 49 is a substantially rectangular plate made of stainless steel, and is fixed to both end portions of the attachment member 51 to form a side portion of the storage portion 43.
The pair of lower guides 55 is an elongated rectangular plate made of stainless steel. Each of the lower guides 55 is disposed along the side plate 49 so that the surface portion extends in the vertical direction and extends in the front-rear direction.
Further, the lower guide 55 is arranged such that the surface portion is curved in a substantially arc shape in the longitudinal direction and the arc is convex downward.
The width of the lower guide 55 (length in the width direction of the coating unit 7) is, for example, 25 mm.
Both end portions of the varnish original roller 29 are positioned so as to cover the inner portion of the lower guide 55.
The rear end of the lower guide 55 is fixed to the front end portion of the mounting member 51 by welding.

The pair of upper guides 53 are stainless steel rod-like members. Each upper guide 53 is curved in a substantially arc shape in the longitudinal direction, and is arranged along the side plate 49 so that the arc protrudes downward and extends forward and backward.
The upper guide 53 is disposed on the lower guide 55 at an approximately constant interval (for example, 1 mm), and both end portions in the longitudinal direction are fixed to the side plate 49 by welding.
The width of the upper guide 53 (the length in the width direction of the coating unit 7) is, for example, 4 mm.

The bottom plate 47 is a rectangular plate made of stainless steel. The bottom plate 47 has a width substantially equal to that of the mounting member 51. Since the bottom plate 47 is as thin as 0.5 mm, for example, it can be elastically deformed.
The bottom plate 47 is inserted into the gap formed between the upper guide 53 and the lower guide 55 from the rear side, and is configured to be arranged along the gap, that is, in a substantially arc shape while being elastically deformed. Has been.
The bottom plate 47 is held such that the front end portion (the end portion on the collection unit 45 side which is the right side in FIG. 3) is located below the upper end of the side plate 49, and forms a container for storing varnish with the side plate 49.
When the length of the bottom plate 47 is changed, the height position of the front end portion can be changed. Therefore, the liquid level height of the varnish where the varnish overflows, that is, the amount of varnish stored can be adjusted.

The distance between the outer peripheral surface of the varnish original roller 29 and the bottom plate 47 is preferably set in balance with the amount of varnish supplied. That is, for example, the amount of varnish passing through this interval is calculated as the varnish moving equivalent to the moving speed of the varnish original roller 29, the interval is calculated assuming that the amount of varnish supplied is substantially equal, and the calculated interval is Set with some margin.
In the case of this embodiment, this interval set by the above is approximately 5 mm, for example.
If this interval is made smaller, the flow of varnish will be hindered. If it is too large, the varnish flows along the bottom plate 47, so that the amount of varnish adhering to the varnish base roller 29 varies. If the amount of varnish adhering to the varnish base roller 29 varies in the plane, the varnish film thickness supplied to the sheet 13 varies depending on the location, and the print quality deteriorates.

The collection unit 45 includes a pan 59 and a return pipe 61.
The pan 59 is a plate made of stainless steel and is formed in a box shape with the top opened.
The pan 59 is arranged so as to cover from the substantially central portion of the lower guide 55 to the front end of the side plate 49 in the front-rear direction and to cover the space between the side plates 49 in the width direction.
The front end surface of the pan 59 is extended so as to incline forward toward the upper side, and is configured to seal between the pair of side plates 49.
The bottom surface of the pan 59 is formed so as to be inclined slightly downward toward the center in the width direction, and the received varnish flows in the center in the width direction.
The return pipe 61 is attached so as to open at a substantially central portion of the bottom surface of the pan 59, and is configured to discharge the varnish collected by the pan 59 to the outside.

The varnish base roller 29 is disposed in a state in which a part of the outer peripheral surface is immersed in a varnish stored in a container formed by the bottom plate 47 and the pair of side plates 49.
The varnish roller 29 rotates counterclockwise in FIG. 3, that is, the lower part of the varnish roller 29 is moved from the rear toward the front.
The varnish original roller 29 is supplied to the rear side of the bottom plate 47, overflows the front end of the bottom plate 47, and moves in the same direction as the varnish recovered in the pan 59.

The varnish roller 31 contacts the varnish roller 29 and the plate cylinder 33 and transfers the varnish adhering to the outer peripheral surface of the varnish roller 29 to the plate cylinder 33.
A varnish plate 39 having an uneven surface shape is wound around the outer peripheral surface of the plate cylinder 33.
A belt-like gap 41 is formed on the outer peripheral surface of the plate cylinder 33 in the machine width direction. In this gap 41, the tail end and tail edge side end of the varnish plate 39 are locked. Then, a plate clamping device (not shown) for clamping the varnish plate 39 to the outer peripheral surface of the plate cylinder 33 is provided.
The varnish adhering to the outer peripheral surface of the varnishing roller 31 is transferred to the surface of the varnish plate 39 and then transferred to the printing surface of the sheet 13 supported and conveyed by the outer peripheral surface of the impression cylinder 35. It is like that.

The varnish plate 39 is formed such that a region where the varnish is transferred to the printing surface of the sheet 13 (for example, a predetermined region such as a pattern portion of the printing surface or the entire printing surface) has a convex shape. Only the adhering varnish is transferred to the printing surface of the sheet 13.
Further, when the varnish is transferred to the sheet 13, the varnish roller 31 and the plate cylinder 33 are driven so as to be connected between the varnish roller 29 and the impression cylinder 35 by a driving device (not shown). When stopping the transfer of the varnish, the varnishing roller 31 and / or the plate cylinder 33 are driven so as to be detached.

The paper discharge unit 9 includes a sheet conveying device 67 and a sheet stacking device 69.
The sheet conveying device 67 is a sheet stacking device 69 in a state where the sheet 13 on which the varnish is transferred to a predetermined area by the coating unit 7 is gripped by the chain gripper 75 provided in the endless chain 73 driven by the paper discharge shaft 71. It is designed to be transported to.
Furthermore, the varnish adhering to the printing surface of the sheet 13 is dried by the drying device 77 during the conveyance.
The drying device 77 is, for example, a hot air delivery device, an IR lamp, or a UV lamp, and is used by appropriately switching depending on the type of varnish used.
For example, when the varnish used is an aqueous varnish or an oil varnish, a hot air delivery device or an IR lamp is used. When the varnish used is a UV varnish (ultraviolet curable varnish), UV is used. A lamp is used.

  The sheet stacking device 69 is configured to sequentially stack the sheets 13 conveyed by the chain gripper 75 of the sheet conveying device 67 on the discharge table 79, and the sheet 13 on the discharge table 79 is set. When the prescribed amount (predetermined number of sheets) is reached, it is configured to be carried out to the outside.

The operation of the sheet-fed printing press 1 according to the above-described embodiment will be described.
First, the printing operation will be described.
The sheets 13 stacked on the paper feed table 11 of the paper feed unit 3 are taken out one by one from the top and conveyed to the printing unit 5.
The sheet 13 conveyed to the printing unit 5 is replaced by the nail device of the intermediate cylinder 25, and then is transferred from the intermediate cylinder 25 to the impression cylinder 23.
At this time, in the printing unit 15a, water is supplied from the dampening device to the non-image area of the printing plate 19 attached to the peripheral surface of the plate cylinder 17, and then the ink is supplied from the ink supply device to the image area of the printing plate 19. Supply.
The printed image on the printing plate 19 thus obtained is transferred to the blanket cylinder 21.
The printed image transferred to the blanket cylinder 21 is transferred to the sheet 13 conveyed by the impression cylinder 23, and the first color is printed.

The sheet 13 on which the first color is printed by the printing unit 15a is delivered from the impression cylinder 23 of the printing unit 15a to the intermediate cylinder 25 of the printing unit 15b, and then delivered to the impression cylinder 23 of the printing unit 15b.
In the printing unit 15b, similarly to the printing unit 15a, the print image formed by the plate cylinder 17 and transferred to the blanket cylinder 21 is transferred to the sheet 13 conveyed by the impression cylinder 23, and printing of the second color is performed.
This is repeated in each printing unit 15c, 15d for color printing.

The sheet 13 printed by the printing unit 5 is delivered from the impression cylinder 23 of the printing unit 15 d to the intermediate cylinder 25 of the coating unit 7, and then delivered to the impression cylinder 35.
In the coating unit 7, the varnish stored in the varnish boat 27 is pumped up by the varnish roller 29 and transferred from the varnish roller 31 to the convex surface of the varnish plate 39 attached to the surface of the plate cylinder 33. The varnish transferred to the varnish plate 39 is transferred to the printing surface of the sheet 13 that is supported and conveyed by the outer peripheral surface of the impression cylinder 35.

The sheet 13 on which the varnish has been transferred by the coating unit 7 is transferred from the impression cylinder 35 to the chain gripper 75 and is conveyed by the chain gripper 75.
On the way, the sheet 13 is conveyed downstream while the surface varnish is dried by a drying device 77, removed from above the paper discharge table 79, dropped, and stacked on the paper discharge table 79.

Next, the effect | action of the varnish boat 27 in the coating unit 7 which is the characteristic part in this embodiment is demonstrated.
When the bottom plate 47 is inserted into a gap formed between the upper guide 53 and the lower guide 55 from the rear side and moved forward, the shape of the bottom plate 47 along the gap, that is, a substantially circular shape, is elastically deformed. An arcuate surface is formed. As a result, the bottom plate 47 constitutes the bottom surface and the front and rear wall portions, the side plate 49 constitutes the side wall portions on both sides, and a container for accommodating a varnish having a bottom surface formed in a curved surface so as to substantially follow the lower shape of the supply roller. It is formed.

The varnish is supplied from a varnish tank (not shown) to the bottom plate 47 at the rear side of the varnish base roller 29, moves below the varnish base roller 29, overflows the front end of the bottom plate 47, falls to the pan 59, and is collected. The
The varnish that has fallen on the pan 59 moves toward the center in the width direction along the inclination of the bottom surface of the pan 59 and is discharged from the return pipe 61 to the outside.
Thus, since the varnish is always supplied, the flow and the surplus are discharged, the varnish original roller 29 is always supplied with a new varnish having a constant viscosity.

Further, since the bottom plate 47 is formed in an arc shape so as to substantially follow the lower shape of the varnish base roller 29, the distance between the surface of the varnish base roller 29 and the bottom plate 47 is substantially equal.
When the distance between the surface and the bottom surface of the supply roller is substantially equal, the varnish flow is likely to be a laminar flow, so that the coating liquid is less likely to stay.
In other words, since there is no corner portion where turbulent flow in which the varnish tends to stay is present in the width direction of the storage portion, the varnish is more difficult to stay. For this reason, the retention of the varnish in the storage part 43 can be suppressed.
Thus, if the retention of the varnish in the storage part 43 can be suppressed, it can prevent that the density | concentration and viscosity of a varnish will become high, and coating quality will fall, and stabilization of coating quality can be aimed at.
In this way, stagnation of the varnish can be suppressed and the varnish coating quality can be stabilized, so that a printed matter with improved print quality can be printed.

In addition, since the varnish overflowing from the front end of the bottom plate 47 is received by the pan 59, it is prevented from being scattered to the surrounding, for example, the equipment constituting the coating unit 7 or the sheet-fed printing machine 1, and causing problems such as dirt. can do.
Furthermore, since the bottom plate 47 can change the height position of the front end when the length to be inserted is changed, the liquid level of the varnish where the varnish overflows, that is, the amount of varnish stored can be adjusted. Can do.

When the printing operation is completed or when the printing operation is stopped, each part of the sheet-fed printing press 1 is washed.
At this time, the varnish boat 27 is also cleaned. This cleaning operation will be described.
When the bottom plate 47 is pulled out by holding the rear end portion, the bottom plate 47 can be guided and removed by the upper guide 53 and the lower guide 55.
Since the removed bottom plate 47 can be washed in a wide place, it can be washed in an easy posture.

  Further, when the bottom plate 47 is removed, the bottom surface of the pan 59, the lower guide 55, and the like are exposed and can be easily approached, so that these cleaning operations can be easily performed. In addition, the length (guide width) along the axial direction of the varnish roller 29 of the upper guide 53 is configured to be smaller than the length of the lower guide 55. As a result, even if varnish having a high viscosity and staying in the vicinity of the side surface portion of the pan 59 is collected, it remains on the surface of the bottom plate 47 that forms the bottom surface portion even in the vicinity of the side surface portion side. It can be easily removed by removing 47.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the present invention has been described by applying to a printing machine capable of printing on one side of a sheet. However, the present invention is not limited to a single-sided printing machine, and various other types such as a double-sided printing machine. It can be applied to a printing press.

It is a front view which shows schematic structure of the sheet-fed printing press using the coating unit concerning one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the coating unit concerning one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the varnish boat concerning one Embodiment of this invention. FIG. 4 is a plan view of FIG. 3. FIG. 4 is a side view of FIG. 3.

Explanation of symbols

1 Sheet-fed printing machine 7 Coating unit 29 Varnish base roller 43 Storage section 45 Collection section 47 Bottom plate 53 Upper guide 55 Lower guide

Claims (6)

A reservoir for storing the coating liquid;
A lower part is immersed in the coating solution stored in the storage unit, and a supply roller that conveys the coating solution to the downstream side by rotation, and a coating apparatus comprising:
The coating apparatus according to claim 1, wherein a bottom surface portion of the storage portion that is disposed to face the supply roller and stores the coating liquid is formed in a curved surface so as to substantially follow the lower shape of the supply roller.   The coating apparatus according to claim 1, further comprising a recovery unit that receives the coating liquid dropped from the bottom surface part at a lower part of the storage unit.   The coating apparatus according to claim 1, wherein the bottom surface portion is detachably attached to the storage portion.   The bottom surface portion is a plate member having elasticity, and is disposed at both side end portions of the storage portion so as to extend in a direction intersecting the axial direction of the supply roller, and is provided with a predetermined interval in the vertical direction. An upper guide and a lower guide, and the upper guide and the lower guide have a curved shape substantially along the lower shape of the supply roller, and the plate member is inserted between the upper guide and the lower guide. The coating apparatus according to claim 3, wherein the coating apparatus is mounted.   The coating apparatus according to claim 4, wherein a length of the upper guide along the axial direction of the supply roller is smaller than that of the lower guide. A printing machine for printing a predetermined image on paper,
A printing machine comprising the coating apparatus according to any one of claims 1 to 5.

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