JPS62268645A - Printing method and apparatus therefor - Google Patents

Abstract

PURPOSE:To markedly reduce the wasteful operating time of an oven and to allow effective utilization efficiency to approach 100%, by applying a drying process to one sheet group and the other sheet group using the same drying line. CONSTITUTION:After one sheet group to be dried, to which a printing/coating process is applied in one printing/coating line 1a, is fed to a drying line 2, a separate sheet group to be fed to the drying line 2 next receives a printing/ coating process in a printing/coating line 1b separate from the printing/coating line 1a. By this method, a necessary time, that is, a time (several min.) considering the frame replacing time of an oven 2 and a stacker 3 is taken without taking an excessive time after the completion of the feed-out of one sheet group and, immediately thereafter, the printing/coating line 1b can be operated and a printing method capable of allowing the time wastefully operating the oven to approach zero can be obtained.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a printing method and apparatus, and in particular to a printing method and apparatus suitable for rigid sheet materials such as metal plates. be.

[Prior Art] A printing method for a rigid sheet material such as a metal plate involves continuously supplying a sheet material (sheet) to be printed using a belt conveyor, and printing and printing equipment including a separate printing machine and/or a coating machine. Printing and/or painting is performed in a painting line, and then the marks 1 and 11 and the painted surface are dried and solidified in a drying line including an oven to complete the printing.

Here, conventionally, one drying line 2 is used as shown in FIG.
However, only one printing/painting line 101 was connected.

[Problems to be Solved by the Invention] For this reason, work such as changing the size of the metal plate to be printed, changing the plate, changing the ink, etc., adjusting the guide, adjusting the color tone, etc., is carried out on the printing line 101. There is a problem in that the oven is wasting its time when sheets are not flowing through the drying line. This is because once the oven is stopped, it takes time and effort to start up again to adjust to the predetermined internal conditions suitable for drying, which is uneconomical. It is.

However, on a line where molds are frequently changed, it is not uncommon for the effective utilization rate to be less than 20% if the effective utilization rate of the oven is simply expressed as It is desired to develop technology that significantly increases the

This invention was made in view of the above-mentioned circumstances, and it significantly reduces the wasted operating time of the oven in printing rigid sheet materials such as metal plates, and improves the effective utilization rate by 1.
The purpose of the present invention is to provide a printing method and apparatus that can approach 00%.

(b) Structure of the invention [Means for solving the problem] Corresponding to this object, the printing method of the present invention includes a printing machine and/or a coating machine that continuously supplies a group of sheets as printing materials. A printing method in which a printing/painting process is performed in a printing/painting line, and then a drying process is performed in a drying line including an oven to complete the printing, wherein a group of sheets to be subjected to the drying process and a group of sheets to be subjected to the drying process. Next, the other sheets are subjected to a drying process using a separate printing/coating process, and the - group of sheets and the other sheet groups are subjected to the same drying process. The printing apparatus of the present invention is characterized in that the drying process is carried out in tMt using a line.
'TJ multiple printing/painting lines, one drying line including an oven for drying and solidifying the printed/painted surface, and connecting the plurality of printing/painting lines to the conveyor on the entrance side of the one drying line. A printing device comprising: a connection line connecting one of the plurality of printing/painting lines (including a cross conveyor connected to one exit side conveyor; the cross conveyor is connected to one exit side conveyor; a run-up belt that transports the sheet in a second direction forming a predetermined angle in plan view with a first direction that is the transport direction of the exit conveyor; and a lug chain for transporting the body in the second direction.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

FIG. 1 is an explanatory diagram showing the printing method of this invention. In the printing method of this invention, one printing/painting line 1
The group of sheets to be dried, which had been subjected to the printing and painting process in step a, was sent to drying line 2. The printing/painting process is not performed on printing/painting line 1b.Here, printing/painting line B is marked 11/painting line 1.
It is connected to the entrance of drying line 2 in parallel with a, and the work such as changing the shape and adjusting the printing and painting process for different types of objects to be dried has been completed in advance by the required time. be.

As a result, the above-mentioned - group of objects to be dried is completely sent out, and after taking the necessary time (several minutes) without taking any extra time, that is, the time (several minutes) that takes into account the time required to change the shape of the oven and the stacker 3. It is possible to obtain a printing method in which the printing/painting line 1b can be started immediately and the time during which the oven wastes FJ 1fJl can be brought closer to O.

Next, a printing apparatus according to the present invention will be explained.

In FIG. 3, 10 is a printing device. The printing device 10 includes two printing/painting lines 1a each including printing fis 6a and 6b and performing printing/painting processes.

1b, one drying line 2 including an oven 16 for drying and solidifying the printed coating surface, and a connection line 17 connecting the two printing/painting lines 1a and 1b to the conveyor on the entrance side of the drying line 2 in parallel in plan view. and.

The printing/coating line 1a includes a feeder 4 that continuously supplies sheets to be printed, a conveyor 5 connecting the feeder 4 and the printing machine, a printing R6a, a conveyor 7a on the exit side of the printing machine 6a, and a conveyor 7a disposed above the conveyor 7a. It includes a sheet checker 8a for checking the printing condition of sheets, a conveyor 12 including a coating machine 11, and a delivery conveyor 13a.

The printing line 1b includes a feeder 4, a conveyor 5, and a printing m
6b, a conveyor 7b, a checker 8b, and a delivery conveyor 13b.

The two printing lines la and 1b each form a straight line,
Although they are located parallel to each other in a plan view, the print line 1b has a higher vertical height from the floor than the print line 1a, as will be described later.

The drying line 2 includes a conveyor 15 at the oven entrance and an oven 16, and is arranged on an extension of the printing line 1a.

In the connection line 17, the cross conveyor 14b, the conveyor 13C1, and the cross conveyor 14a, which are vertically connected to the end of the conveyor 13b, are arranged in a straight line in plan view, and the cross conveyor 14a is connected to the end of the conveyor 13a and the conveyor 15, and completes the straight main line 8 that connects the printing line 1a and the drying line 2, while the supply line B that connects the printing line 1b, the connection line 17, and the drying line 2, The cross conveyors 14b and 14a are bent perpendicularly in a plan view at two locations.

In a device that prints and paints heavy sheets such as metal sheets at a speed of more than one sheet per second and continuously transports them at a speed of more than 2 meters per second, the direction of transport is converted by 90 degrees in plan view in this way. This requires measures to prevent the sheet material from impacting the device and from bending the sheet material itself.Since this point is an important part of the printing device of the present invention, this point will be explained below. I will focus on this.

The conveyor 13b is shown in FIGS. 4(a) and 4(b).

As shown in detail in (C) and (d), a frame 18 is provided. The frame 18 embraces a rectangular parallelepiped space with four legs 18a fixed perpendicularly to the floor surface, and has a beam 18b at the upper end of each left and right side in the direction 20, and a beam 18c at an intermediate height position. A beam member 18d is extended parallel to the floor surface, and is extended near the upper end of each of the front and rear sides.

A plurality of flat belts 21 are arranged on the upper surface of the frame 18 in the direction 2.
It is located parallel to 0. Of the pulleys 22 and 23 on the conveyor inlet and outlet sides for the flat belt 21, the pulley 22 is attached to the 'Th1l 24 that extends over a fixed position on the girder 18a of the frame 18. The shaft 25 of the pulley 23 is not attached to a fixed position on the frame 18, but to a tip 19 on the direction 20 side of a slide frame 26 that can move forward and backward in the direction 20 on the frame 18.

That is, the slide frame 26 has a contour that can almost cover the upper surface of the frame 18, and a slide frame main body 35 in the shape of a flat rectangular parallelepiped with an open bottom end;
A hollow prismatic side frame 36 fixed to the left and right sides of the side frame 3
A recessed rail-shaped slide guide 37 is provided in contact with and fixed to the outer surface of the slider 6 (FIG. 4(d)). The slide guide 37 is a portion that engages with a slider (to be described later) of the frame 18 while the slide frame 26 moves forward and backward in the direction 20, and the load is supported by the slider.

A rack 33 having a longitudinal direction in the direction 20 and a downward facing tooth surface 33a is fixed to the lower end portions of the left and right side frames 36, respectively.

A pair of side guides 30 rising vertically flush with the inner surfaces of the left and right side frames 36 are attached to the side frames 36 via support angles 29, and the side guides 30 regulate and guide the side surfaces of the sheet.

On the other hand, in the frame 18, the support angles 27 fixed to the upper surfaces of the left and right beam members 18b are connected to the beam U18b.
It has a slider fixed to the inner surface of the vertical wall 27a that stands vertically above the slide guide 28, and this slider slidably engages with the recess of the slide guide 28 to regulate and guide the slide frame 26.

In addition, the left and right beam members 18b are provided with a direction perpendicular to the direction 20.
A binion 32 that meshes with the rack 33 is fixed near the left and right ends of the shaft 31, and as the slide frame 26 moves forward and backward in the direction 20, the binion 32
And IT! l131 meshes and rotates to allow this. Axis 3
One end 31a of the slide frame 26 protrudes to the outside of one of the beam members 18b, and a brake 34 is attached to the one end 31a.By operating the brake 34 to press the shaft 31 and prevent its rotation, the slide frame 26 can be rotated. The position can be fixed.

The flat belt 21 is wound endlessly between pulleys 22 and 23, and the tension of the flat belt 21 is obtained by operating a tension pulley 38.

The driving force for the flat belt 21 is given from a drive shaft 40 driven by a motor 41.

On the upper surface of the slide frame 26, a plurality of flat rectangular tubular ducts 42 can be drawn parallel to the flat belt 21 at left and right positions of the track of the flat belt 21.

The upper surface of the duct 42 is slightly lower than the upper surface of the pulleys 22.23, that is, the lower surface of the feed surface, and does not interfere with the conveyance of the object by the flat belt 21.

The duct 42 has a base 42a with respect to the direction 20 that is connected to the blower 4.
3, and the tip in the direction 20 is open toward the direction 20 at the end of the slide frame 26, and the air outlet 4 from the blower 43
It is 2b.

In order to prevent objects to be transported from coming into contact with the top surface of the duct 43, a rail 44 is attached to the top surface of the slide frame 26 at a position below the track of the flat belt 21 between the pulleys 22 and 23. The top surface of the rail 44 is located at a position somewhat higher than the top surface of the duct 43, and the flat belt 21 is placed on the rail 44.
It is regulated by the top surface of the duct and does not fall downward and come into contact with the top surface of the duct.

By appropriately selecting the wind speed from the air outlet 43a depending on the material, size, thickness, weight, transfer speed r1j, etc. of the object to be transported, the direction from the end of the conveyor 13b can be adjusted according to the movement of the flat belt 21. The conveyor 13b is supported in a state of protruding toward the conveyor 20, and the conveyor 13b is kept in a nearly horizontal position 19 until the moment it is removed.

An idler pulley 4 is located below the rail 44 at the rear position of the lower surface of the slide frame body 35 in the direction 2o.
5, and the idler pulley 45 is attached to the left and right side frames 36.
is attached to a shaft 46 extending perpendicular to direction 20.

Next, the cross conveyor will be explained.

The cross conveyor 15b receives the sheets from the conveyor 13b and transfers the sheets in a direction 30 perpendicular to the transport direction 20 in plan view, as shown in FIGS. 5(a) and 5(b).
As shown in detail in (c), the upper surface of the frame 48 enclosing the space of a rectangular parallelepiped has a lug chain 46 for transporting the sheets and two run-up belts sandwiching the lug chain 46 at the center. 47, and the remaining left and right portions are a receiving plate 49 that receives and stops the sheets from the conveyor 13b.

That is, the cross conveyor 15b includes a frame 48, and the frame 48 has four wooden legs 48 fixed perpendicularly to the floor surface.
The space of a rectangular parallelepiped is surrounded by a, and beam members 48t) are provided at the upper end portions of each left and right side surface in the direction 30.

A lug chain 46 is attached to the girder member 48b at the end on the conveyor entrance side.
The shaft 53 of the inlet side sprocket 51 of
The shaft 54 of the inlet pulley 52 of the run-up belt 47 is located forward in the direction 30, and the outlet sprocket 55 of the lug chain 46 and the run-up belt 47 are located at the exit end of the conveyor.
A common shaft 57 with the outlet pulley 56 extends between the two.

Continuously variable transmission 1 that drives a lug chain 46 and a run-up belt 47 on a portion above a vertical plane 50 including sprockets 51 and 55
58 is arranged, and the continuously variable transmission 58 has a lug chain 46.
a lug chain drive sprocket 61 that drives the run-up belt 47; a run-up belt drive pulley 62 that drives the run-up belt 47;
has. For example, the lug chain 46 has a speed of 97 to 105 per minute.
m, the running speed of the run-up belt 47 is, for example, 55 to 70 m/min, and the lug chain 46 moves at a faster speed than the run-up belt 1-47.
It is set to be faster.

The lug chain 46 connects the sprocket 51, the lug chain take-up device 63, the lug chain drive sprocket 61, the sprocket 64, and the sprocket 55.
It is wound endlessly with υ, and near the sprocket 64,
Proximity sensor 65 for detecting the approach of the attachment 46a of the lug chain 46 and timing the rear of the line
is installed. Here, the attachment 46a contacts the rear portion of the sheet in the transport direction and moves the sheet in the direction 30.
This is a protrusion for pushing and transferring.

The run-up belt 47 is wound endlessly by connecting pulleys 52 and 56, and its driving force is transmitted from the run-up belt drive pulley 62 to the pulley 52.

The receiving plate 49 consists of two receiving plates 49a and 49b arranged on the left and right sides of the run-up belt 47, respectively.
9a and 49b are configured to have variable widths. In other words, the receiving plate 49a has two receiving plate members 50a, one on the outer side and the other in the center.
50b, the outer receiving plate member 50a has two sliding members 68 attached to its lower surface at intervals in the direction 30,
Each sliding member 68 is fitted into two supports 66 and 67 extending parallel to each other at intervals in the direction 30 on the beam member 68b so as to be movable in the longitudinal direction.

The central receiving plate member 50b is slidably mounted on the receiving plate member 50a with its lower surface overlapping the upper surface of the receiving plate member 50a, and as the sliding member 68 is slid onto the support shaft 66, 67, the overlap is increased. The width is adjustable. The receiving plate member 50a has a side guide portion 71 that is bent upward and outward at the outer end, and the side guide portion 71 contacts the side surface of the sheet to regulate and guide it.

The receiving plate 49b is configured similarly to the receiving plate 49a, but
The outer receiving plate member 50a' differs from the receiving plate 49a in that it does not have a side guide portion 71.

At the center portion of the left and right beam members 48b in the direction 30,
A feed screw is formed in the ir* 78, and a receiving plate member 50a is provided on the shaft 78.

A feed nut (U in the figure) fixed to the lower surface of 50a' is fitted into each. The feed screw is connected to the receiving plate members 50a, 5
The portion 0a' is formed in the opposite direction. axis 78
By operating the handle 81 attached to one end and rotating the shaft 78, the fitting position of the feed nut on the shaft 78 can be changed, and the width of the receiving plates 49a and 49b, and thus the width of the receiving plate 49, can be adjusted to the maximum. The value W can be adjusted to the minimum value W2.

A conveyor 13b is provided between the receiving plate material 50a' and the girder material 48b.
A rubber gauge 70 is disposed to catch the tip of the sheet body having an inertial force coming out from the sheet body and directed in the direction 20, and to regulate it so that it falls exactly onto the four receiving plates.

The rubber gauge 70 is configured to move forward and backward in the width direction of the conveyor in conjunction with the receiving plate member 50a'.

In other words, the shafts 82.83 are attached to the left and right girder members 48b in positions between the shafts 66 and 78, and between the shafts 78 and 67, respectively. The sliding members 72 are fitted in such a way that they can be moved one by one. A branch 73 is fixed to each sliding member 72 and stands vertically upward, a boss 74 is fixed to the top of each support 73 facing inward, and one shaft 75 is inserted through the tip 81 of each boss 74. It is supported parallel to direction 30. A plurality of bosses 76 are attached downward to the shaft 75, and a gauge is attached to the lower end of each boss 76! l1i77 is fixed downward, the inner surface of each gauge plate 77 is flush, parallel to the direction 30, and perpendicular to the receiving plate 49, and the lower end of each is located below the outer edge of the receiving plate member 50a'. do.

Each post 73 also has a bar 80 disposed parallel to direction 30.
A feed nut (not shown) that fits with the shaft 78 is attached to the lower surface of the plate 84, and when the handle 81 is operated, the rubber gauge 70 is moved to the receiving plate 50a'. It moves forward and backward in the width direction of the conveyor in conjunction with the conveyor.

The feed surface of the cross conveyor 14b is one step lower than the feed surface of the conveyor 13b, for example, 110M lower, and the tip of the slide frame 26 slid in the direction 20 from the tip of the conveyor 13b is above the outer edge of the receiving plate member 50a. The mutual frames 18.48 are thus positioned.

The conveyor 13c is configured similarly to the conveyor 13b, but differs from the cross conveyor 13b in that its feed surface is the same as the cross conveyor 14b and is one step lower than the feed surface of the conveyor 13b. The cross conveyor 14a is configured similarly to the cross conveyor 14b, and the conveyor 13
The purpose is to receive and transfer the sheet material coming out from c and having an inertial force in direction 30 in direction 20, and the positional relationship between cross conveyor 14a and conveyor 13G is as follows: It is the same as the positional relationship. However, the rubber gauge 7 is on the left side when facing the transfer direction.
It differs from the cross conveyor 14b in that it is provided with 0 and that the feed surface is further lowered by one step.

The configuration of the conveyor 13a is similar to that of the conveyor 13b, but the field surface is two stages lower than the conveyor 13b.

Next, the power transmission relationship between the printing press and the conveyor will be described with reference to FIG.

First, take out the rotation of the printing press 6a of printing line A.
185a is connected to the shaft 87a via a cam clutch 86a. The cam clutch 86a is automatically disengaged when printing 1a6a is stopped. Shaft 87a connects to shaft 91a through bevel gearbox 88a1 clutch 80a. The bevel gear box 88a has conveyors 7a and 12.
A drive shaft 92a is connected thereto. Shaft 91a is connected to shaft 94 through bevel gearbox 93a, and shaft 94 is connected to shaft 96 through bevel gearbox 95.

The bevel gear box 95 is connected to the shaft 97a.
drives the lug chain and run-up belt of the cross conveyor 14a.

A shaft 85b that transmits the rotation of the print 16b of the printing line B is connected to a shaft 87b via a cam clutch 86b, and the cam clutch 86b is automatically disengaged when the printing press 6b is stopped. Shaft 87b connects to shaft 91b via bevel gearbox 88b. A drive shaft 92b of the conveyor 7b is connected to the bevel gear box 88b. @11
91b is connected to 11iI via bevel gear box 93b.
1194, the shaft 97b is connected to a shaft 98 via a clutch 80b, and the shaft 98 is connected to the bevel gearbox 93a of printing line A.

Although this embodiment is an example in which the printing line B does not include a coating method, it may of course include a coating machine.

[Operation] In the printing apparatus 10 configured as described above, when printing on the printing line A, the switching clutch 80b is disengaged because the printing line B is stopped, but the switching clutch 80b is also disengaged.
6b is cut to double prevent malfunction, and the conveyor 13
Move the slide frame c backward.

When the printing ti6a starts printing, the conveyor 7a is driven by the drive shaft 92a, and the sheets are moved to the sheet (he checker 8).
a, is coated with a coating machine 11, and sent to a conveyor 13a. The conveyor 13a is driven by a motor 41 and sends the sheets to the entrance of the cross conveyor 14a. Since the cross conveyor 14a is flush with the conveyor 13a, the sheets are first moved in the direction 20 by the run-up belt 47 driven by the continuously variable transmission 58, and then moved by the run-up belt 47.
J: Fast-rotating lug chain attachment 46a
It is sent to the conveyor 15 by being pushed from the rear. The conveyor 15 is driven by a single motor to feed the sheets into the oven.

When the printing/coating process for one loft in the printing line A is completed and the last sheet enters the oven 16 and the sheet no longer flows into the printing/coating line 1a, the switching clutch 80a is disengaged with the stop of printing g15a.

Here, even if the last sheet printed by the printing machine 6a is in the drying process in the oven, if the oven does not need to be changed in order to print the next different type of rod, the printing can be carried out immediately. Printing on line B can now begin.

That is, the cam clutch 86a is disengaged to double prevent malfunction, the slide frame of the conveyor 13a is moved backward, and the slide frame of the conveyor 13C is moved forward.
, connects the clutch 80b and starts printing the print 16b. At the exit of the conveyor 13b, the printed sheets fly out in the direction 20 while maintaining an almost horizontal attitude due to the air blowing out from the air blowing port, contact the gauge roots 77 of the rubber gauges 70 of the cross conveyor, and are received. It falls onto the plate 49, and after running up at the run-up bell [47], it is pushed onto the conveyor 13C by the lug chain 46. The sheet similarly falls from the conveyor 13c onto the cross conveyor 14a, is pushed out onto the conveyor 15,
Sent to the oven.

Thus, if there is no need to change the oven, the oven will operate continuously and the drying process will continue.

Also, if the oven needs to be changed, the drying step of line 11 B can be carried out immediately after the time (several minutes) required for this change.

(c) Effects of the Invention As is clear from the above explanation, according to the present invention, when printing rigid sheet materials such as metal plates, the wasted operating time of the oven can be significantly reduced, and the effective utilization rate can be increased to 100%. %
It is possible to obtain a printing method and apparatus that are particularly effective for small loft printing.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the printing method of the present invention, FIG. 2 is an explanatory diagram showing the conventional printing method, FIG. 3 is a plan view showing the printing apparatus of the present invention, and FIG. A plan view showing the 8-line feed conveyor of the printing device shown in the figure, FIG. 4(b)
is a front view of the feed conveyor shown in Fig. 4(a), and Fig. 4(
C) is a side view of the feed conveyor shown in Fig. 4(a);
Figure (d) is a D-D1gi plane view in Figure 4 (a), Figure 5 (a) is a plan view showing the printing device cross conveyor shown in Figure 3 without the run-up belt and lug chain, Figure 5 (
b) is a front view of the cross conveyor, and FIG. 5(C) is a side view of the cross conveyor. 1a, lb...Printing/painting line 2...Drying line 3...Stacker 4...Feeder 5
... Conveyor 6 ... Printing machine 7 ... Conveyor 8 ... Sea 1 to checker 11 ... Conveyor 12 ... Painting machine 13a, 13b ... Conveyor 1
4a, 14b...Cross conveyor 15...Conveyor 16...Oven 17...Connection line 18...Frame 18a...II! I 1
8b... Girder material 18d... Beam material 19... Tip
20...Direction 21...-Flat belt 22.23.
...Pulley 24.25...Shaft 26...Slide frame 27...Support angle 28...Slide guide 31...Shaft 32...Binion 3
3... Rack 34... Brake 35... Slide frame body 36... Side frame 37... Side plate
38...Tension pulley 40...Drive shaft 41...Motor 42...Duct 42b...Air outlet 43...Blower 43...Air outlet 44...Rail 4
5... Idler pulley 46... Lug chain
46a... Attachment 47... Run-up belt
48... Frame 49... Receiving plate 51...
・Sprocket 52...Pulley 53.54...
・Shaft 55...Sprocket 56...-Pulley 57...Shaft 58...Continuously variable transmission 61...
・Lug chain drive sprocket 62... Run-up belt drive pulley 63... Lug chain take-up device 64... Sprocket 65... Proximity sensor 66.67... Shaft 68... Mounting member
70... Rubber gauge 71... Side guide part 72... Mounting member 73... Support column 74...
・Boss 75...Shaft 76...Boss 77・
... Gauge plate 78 ... Shaft 80 ... Bar material
81...Handle 82.83...Shaft 84.
... Hole 85 ... Shaft 86 ... Cam clutch 8
7... Axis 88... Bevel gear box 91.
・・Shaft 92 ・・Drive shaft 93.95 ・・Bevel gear box 94.96 ・・Shaft 97 ・・Shaft Patent applicant: Toyo Seikan Co., Ltd. Patent attorney Yasuo Kawai Figure 1 b Figure 2

Claims (3)

[Claims] (1) Continuously supply a group of sheets to be printed and perform a printing/coating process in a printing/coating line including a printing machine and/or a coating machine, and then a drying process in a drying line including an oven to print. A printing method in which one group of sheets to be subjected to the drying process and another group of sheets to be subjected to the drying process next to the first group of sheets are printed and painted using separate printing and painting lines. and performing a drying process on the one sheet group and the other sheet sheet group using the same drying line. (2) A plurality of printing and painting lines that perform printing and painting processes on a group of sheets, one drying line that includes an oven that dries and hardens the printed and painted surfaces, and the plurality of printing and painting lines. a connection line connecting the drying line to an inlet conveyor of the one drying line, the connection line connecting to an outlet conveyor of at least one of the plurality of printing/painting lines. The cross conveyor includes a run-up belt that transports the sheet material in a second direction that makes a predetermined angle in plan view with a first direction that is the transport direction of the exit side conveyor; a lag chain that transports the sheet material in the second direction while regulating the transport interval of the sheet material. (3) The printing device includes an air blowing device that blows air in the first direction along the lower surface of the feed surface from the end of the conveyor on the exit side of the printing/painting line, and the cross conveyor - The printing device according to claim 2, wherein the printing device is connected to the outlet end of the painting line via a vertically downward step.