JP2000006362A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vertically move a plate cylinder inexpensively by a small driving force with a simple mechanism by rotatably coupling to support the cylinder and an ink transfer roll by a pair of link members, and moving the roll integrally with the cylinder via the members. SOLUTION: An eccentric driving mechanism has an eccentric housing 22 for a plate cylinder rotatably supported to a link member 32 for supporting to couple the cylinder 20 to an ink transfer roll 28 and having an eccentric through hole 22a formed eccentrically at a predetermined amount from a rotating center C1 of the housing 22 to rotatably support a shaft of the cylinder 20, a first gear provided at the housing 22 at a center coincident with the center C1 of the housing 22, and a moving motor for rotating a second gear engaged with the first gear. In this case, the member 32, the cylinder 20 and the roll 28 move without changing a center distance between the cylinder 20 and the roll 28 in the case of vertically moving the cylinder 20 by the driving mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for performing required printing on a corrugated cardboard sheet as a sheet material passing between a plate cylinder on which a printing plate is mounted and an impression cylinder arranged opposite to the plate cylinder. Also, the present invention relates to a printing apparatus in which a plate cylinder is separated from an impression cylinder so that a corrugated cardboard sheet can be passed through without printing and a printing plate can be replaced.

[0002]

2. Description of the Related Art In a multicolor printing apparatus for performing required printing on a corrugated cardboard sheet cut to a predetermined length, a plurality of printing units are arranged in series, and the corrugated cardboard sheet is passed through each printing unit. Is configured to print the required color. In each printing unit, the plate cylinder on which the printing plate is mounted and the impression cylinder are rotatably arranged in an up-and-down relationship sandwiching the path line of the cardboard sheet, and the ink supply mechanism is arranged above the plate cylinder. Then, a predetermined amount of ink is supplied to a required printing plate mounted on the outer periphery of the plate cylinder. In a printing apparatus in which the plate cylinder is located above the pass line, printing is performed on the upper surface of the cardboard sheet.

[0003] In the printing unit, it is necessary to separate the plate cylinder from the impression cylinder or the pass line in order to allow the corrugated cardboard sheet to pass through without printing, or to exchange the printing plate in the state where the cardboard sheet passes while printing. An elevating device for that purpose is provided. This elevating device includes a sub-frame movably movable with respect to a main frame, and the sub-frame is provided with a plate cylinder and an ink supply mechanism. In addition, the screw shafts screwed into the four sides of the sub-frame are rotatably supported by the main frame, and the four screw shafts are synchronously rotated forward and reverse by a motor, thereby moving the sub-frame up and down with respect to the main frame. It is configured to In addition,
It has been proposed to move the sub-frame directly up and down by a hydraulic or pneumatic hydraulic cylinder.

[0004]

In the above-described lifting device, the sub-frame is raised and lowered by synchronously rotating the screw shafts provided on all sides, so that if the rotation balance of the four screw shafts is deviated, the sub-frame will be raised and lowered. A serious problem that stops halfway may occur. In addition, a disadvantage is pointed out that the mechanism becomes complicated, the number of parts is large, and maintenance becomes complicated. When a fluid pressure cylinder is used as the subframe raising / lowering drive source, delicate vertical adjustment cannot be performed, and positioning of the plate cylinder at a fixed position becomes unstable. For this reason, it is difficult to finely adjust the thickness of the step roll sheet on the plate cylinder side, and it has been performed on the impression cylinder side. However, in this case, the upper end level of the roller, which is rotatably disposed below the pass line and supports the lower surface of the corrugated cardboard, and the finely adjusted impression cylinder changes, causing a level difference, resulting in printing deviation and uneven printing. And other problems.

[0005] Further, since the plate cylinder and the ink supply mechanism are provided on the integrated sub-frame, the weight is increased, and a high-output driving source for the lifting device must be used. However, it is pointed out that the size is increased and the cost is increased. In addition, the lifting device using the screw shaft has a disadvantage that it takes time to move the heavy subframe up and down, and the cycle time for the printing plate exchange becomes longer, thereby lowering the production capacity.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem in a favorable manner. It is an object of the present invention to provide a printing apparatus capable of realizing vertical movement and reducing the time and cost involved in plate exchange.

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and appropriately achieve the intended purpose, a printing apparatus according to the present invention comprises a plate cylinder on which a printing plate is mounted, and a printing cylinder arranged opposite to the plate cylinder. Support means, an ink transfer roll that rotates in contact with the printing plate of the plate cylinder, and squeezing means that performs squeezing adjustment of the amount of ink by contacting the ink transfer roll. In a printing apparatus configured to transfer ink and pass a sheet material between the plate cylinder and the support means to perform required printing on the sheet material, the plate cylinder and the ink transfer roll are rotatable. And a pair of link members that are connected to and supported by the printer, and displacing means for displacing the rotation center of the plate cylinder without substantially changing the distance between the rotation center of the ink transfer roll and the rotation center of the plate cylinder. And said Characterized by being configured to move the inking roller plate cylinder and integrally via the link member.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a printing apparatus according to the present invention. FIG. 1 is a schematic side view showing the overall configuration of a printing apparatus according to an embodiment. In the illustrated printing apparatus 10, a plurality of (three in the embodiment) printing units 11 having the same configuration are arranged in series. A corrugated cardboard sheet configured and fed horizontally from a sheet feeding device (not shown) arranged on the upstream side
(Sheet material) is printed in a required color each time it passes through each printing unit 11. In addition, each printing unit 11,
A step 12 for performing printing plate replacement is provided between the printing plates 11, and an operator performs printing work on the printing plate in step 12. Each printing unit 11 is covered with a cover 13, and a door (not shown) is attached to the step side of the cover 13 so as to be openable and closable, and the printing plate is replaced by opening the door.

(Regarding the Sheet Conveying Apparatus) The illustrated printing unit 11 includes a pair of frames 15 and 15 (FIG.
And a sheet conveying device 16 is disposed between the frames 15 and 15 below the corrugated sheet pass line. As shown in FIG. 1, the sheet conveying device 16 includes an air box 17 disposed below the pass line, and a suction unit such as a blower (not shown) is connected to the air box 17 to operate the suction unit. By doing so, the inside of the air box 17 is configured to be in a negative pressure state. On the upper surface of the air box 17, a plurality of openings 17a are opened in a required pattern.
Further, inside the air box 17, a plurality of feed rollers 18 as rotatable driving members are rotatably disposed, and each of the feed rollers 18 protrudes upward from the corresponding opening 17a on the outer peripheral surface. Positioned. That is, the air box 1
By bringing the lower surface of the corrugated cardboard sheet into contact with the feed roller 18 by the suction force due to the negative pressure of 7, the feed force due to the rotation of the feed roller 18 is applied to the cardboard sheet and conveyed.

(Regarding the Plate Cylinder and Impression Cylinder) An impression cylinder 19 serving as a support means is rotatably disposed inside an air box 17 of the sheet conveying device 16. Similarly, the air box 17 is positioned with its outer peripheral surface protruding upward through an opening 17a formed on the upper surface. The upper end level of the impression cylinder 19 is set to be the same as the upper end level of the feed roller 18, and passes through the position where the impression cylinder 19 is disposed without changing the lower surface level of the corrugated cardboard sheet conveyed by the feed roller 18. It is configured as follows.

A plate cylinder 20, on which a printing plate (not shown) is removably mounted, is opposed to the impression cylinder 19 with a pass line therebetween, between the frames 15, 15 facing above the pass line of the cardboard sheet. The plate cylinder 20 and the impression cylinder 19 are arranged so as to be rotated in mutually opposite directions by a drive system described later. The plate cylinder 20 is moved toward and away from the impression cylinder 19 by an eccentric drive mechanism 21 as a displacement unit.

(Eccentric drive mechanism) As shown in FIG.
The plate cylinder eccentric housings 22 are rotatably inserted into the plate cylinder support through holes 15a formed in the frames 15, respectively.
To the housing 22, the eccentric hole 22a is formed to a position eccentric by a required amount from the rotation center C ₁ and the inner diameter center C _2. And the eccentric housing 2 for both plate cylinders
Eccentric through-hole 22 in which the inner diameter centers C ₂ , C ₂ of ₂ , 22 are matched.
a, 22a, a shaft portion 20 extending to both sides of the plate cylinder 20;
a and 20a are rotatably supported. At the outer end projecting outward from the frame 15 of each plate cylinder eccentric housing 22,
A _first lifting gear 23 having a center coinciding with the rotation center C1 of the housing 22 is provided.

An elevating shaft 24 is rotatably disposed between the frames 15 and 15 near the position where the plate cylinder 20 is disposed, and extends outward from each frame 15 of the elevating shaft 24. A second lifting gear 25 that meshes with the first lifting gear 23 is disposed at the position so as to rotate integrally. An elevating motor 26 is provided outside one frame 15, and an elevating shaft 24 is connected to the motor 26 so that the motor 26 can be rotated forward and backward. That is, by rotating the elevating shaft 24 forward and reverse by the elevating motor 26, the two gears 23, 25
Rotates the plate cylinder eccentric housing 22 through the eccentric hole 22a, a plate cylinder 20 which is supported on 22a of the housings 22 and 22, eccentricity of the rotation center C ₁ and the inner diameter center C ₂ Only moving toward and away from the impression cylinder 19 (moving up and down)
Then, it is positioned at a printing position (FIG. 3) close to the impression cylinder 19 and a rest position (FIG. 4) away from the impression cylinder 19. In the embodiment eccentricity of the rotation center C ₁ and the inner diameter center C ₂ is set to several 10 mm, the plate cylinder 20 to the impression cylinder 19 is movable in a multiple of the range of eccentricity.

(Regarding the Connection Mechanism of the Plate Cylinder, Ink Transfer Roll, and Squeezing Roll) An ink transfer mechanism 27 for transferring ink to the printing plate is provided above the plate cylinder 20. As shown in FIG. 3, the ink transfer mechanism 27 includes an ink transfer roll 28 for directly transferring the supplied ink to the printing plate, and a squeeze roll as a squeezing means which is pressed against the roll 28 to adjust the amount of ink. 29, and a swing mechanism 30 capable of displacing the ink transfer roll 28 in a required angle range around the rotation axis of the squeezing roll 29. Then, the ink transfer mechanism 27 and the plate cylinder 20 are connected by a connecting mechanism described later, and as the plate cylinder 20 is moved up and down by the eccentric drive mechanism 21, the ink transfer mechanism 27 also moves integrally. It is configured as follows.

As shown in FIG. 2, a support ring 31 whose center coincides with the rotation center (inner diameter center C ₂ ) of the plate cylinder 20 is fixed to the outside of each of the plate cylinder eccentric housings 22 by bolts. The first link member 32 is rotatably fitted to the outside. A connecting ring 33 is provided on a portion of the first link member 32 extending radially outward from the support ring 31.
Are bolted, and a second link member 34 is rotatably fitted to the ring 33. The second link member 34
An eccentric housing 35 for the squeezing roll is rotatably disposed at a portion extending radially outward from the connecting ring 33 of the squeezing roller 33. The eccentric housing 35 for the squeezing roll is rotatably supported by the frame 15. Eccentric housing 3 for squeezing roll
The 5, eccentric hole 35a is formed to a position eccentric by a required amount from the rotation center C ₃ to the inner diameter center C _4. And the eccentric housings 35 for both drawing rolls, 35
Eccentric through-holes 35a, 35a whose inner diameter centers C ₄ , C ₄ are matched.
A shaft portion 29a extending on both sides of the squeezing roll 29;
29a is rotatably supported. The second link member 34 is externally fitted to a portion of the eccentric housing 35 for the squeezing roll that extends outside the frame 15.

An ink bracket 36 is rotatably fitted to a portion of each of the eccentric housings 35 for the squeezing rolls extending inside the frame 15, and the eccentric housing 3 for the squeezing rolls of the two ink brackets 36, 36.
Shafts 28a, 28a extending on both sides of the ink transfer roll 28 between the portions extending radially outward from 5, 35.
Are rotatably supported. Ink transfer roll 2
A transmission shaft 37, which is rotatably supported by the connection ring 33, is connected to one shaft portion 28a of the motor shaft 8 via an Oldham coupling 38, so that a radial displacement between the shaft portion 28a and the transmission shaft 37 is prevented. It is configured to allow.

Then, as described above, the first link member 3
2, the plate cylinder 20, the ink transfer roll 28, and the squeeze roll 29, which are interconnected by the second link member 34 and the ink bracket 36, include the eccentric drive mechanism 21
When the ink transfer mechanism 27 is moved up and down, the ink transfer mechanism 27 moves without changing the distance between the axes of the plate cylinder 20 and the ink transfer roll 28, and between the ink transfer roll 28 and the squeezing roll 29.

(Regarding the oscillating mechanism of the ink transfer mechanism) As shown in FIG.
An air cylinder 39 is oscillated vertically above the ink transfer roll 28 on the side where the ink transfer roll 28 is supported, and a piston rod 39a of the cylinder 39 is rotatably connected to the corresponding ink bracket 36. When the pair of air cylinders 39, 39 are urged synchronously, the ink bracket 36 is rotated with respect to the eccentric housing 35 for the squeezing roll, and the ink transfer roll 28 is brought into contact with the printing plate to form the ink. And a non-transfer position where the ink is not allowed to be transferred away from the printing plate. Swing mechanism 3
0 is a detecting means (not shown) for detecting whether or not a corrugated cardboard sheet is passed between the plate cylinder 20 and the impression cylinder 19.
Are set so that the ink transfer roll 28 is positioned at the transfer position in the detection state, and the ink transfer roll 28 is automatically positioned at the non-transfer position in the non-detection state.

An adjusting shaft 40 is rotatably disposed between the second link members 34, 34. The adjusting shaft 40 is provided with an adjusting hole 36 formed at a corresponding position of each ink bracket 36.
a. The adjusting shaft 40 has an adjusting hole 36.
The eccentric ring 41 is eccentrically disposed at a position corresponding to the above, and the upper end of the eccentric ring 41 is configured to always contact the inner upper surface of the adjustment hole 36a. The adjusting shaft 40 is rotated by operating means such as a motor or an air cylinder (not shown).
Is rotated at the required center angle, so that the second link member 34,
34 and the ink brackets 36, 36, the ink transfer roll 28 and the plate cylinder 20 at the transfer position are changed.
Can be finely adjusted. The distance between the ink transfer roll 28 and the plate cylinder 20 is adjusted by the first method.
The second link members 32 and 34 are allowed by an Oldham coupling 38 which connects a transmission shaft 37 provided on a connection ring 33 to which the common outside is fitted and a shaft 28a of the ink transfer roll 28.

(Regarding the mechanism for adjusting the distance between the ink transfer roll and the squeezing roll) The squeezing roll 29 provided adjacent to the ink transfer roll 28 is
During the operation, the transfer roller 28 is always in contact with the transfer roller 28 and rotates at a lower speed than the transfer roller 28, so that the excess ink on the surface of the ink transfer roller 28 is adjusted. As shown in FIG. 2, an adjusting pinion 42 is disposed at the outer end of each eccentric housing 35 for the squeezing roll so as to rotate integrally. An air cylinder 43 is disposed on each of the frames 15 in an inverted state.
3a, a rack 44 meshing with the adjusting pinion 42
Are connected. That is, by rotating the adjusting pinion 42 in the forward and reverse directions via the rack 44 by urging the air cylinder 43 in the forward and reverse directions, the eccentric housing 35 for the squeezing roll rotates with respect to the frame 15. roll 29 stop just eccentricity amount between the inner diameter center C ₄ of the rotation center C ₃ and the eccentric hole 35a is close, move relative to inking roller 28 (adjusted pressing force).

(Driving System) Next, the driving system of the impression cylinder 19, plate cylinder 20, ink transfer roll 28 and squeezing roll 29 will be described. For convenience of explanation, the side on which the drive system is provided is referred to as a drive side, and the opposite side is referred to as an operation side. As shown in FIG. 5, a drive motor 45 is provided outside the drive frame 15, and a pulley 45 a provided on an output shaft of the drive motor 45 and a speed reducer 46 provided on the drive frame 15 are provided. Pulley 47 disposed on the driving shaft 47 provided
a first endless belt 48 is wound around the first endless belt 48. The speed reducer 46 is provided with an operation shaft 49 orthogonal to the drive shaft 47, and the operation shaft 49 is connected to the shaft portion of the impression cylinder 19. When the drive motor 45 is driven, the drive shaft 47 and the operation shaft 49 The impression cylinder 19 is configured to always rotate via the pressure roller.

A transmission pulley 51 is rotatably fitted to the operating shaft 49 via a tooth clutch 50, and the operating shaft 49 and the transmission pulley 51 are
Are integrally rotated, and the transmission pulley 51 is freely rotatable with respect to the operation shaft 49 in the OFF state.
A pulley 20b is disposed on a shaft portion 20a extending outward from the drive-side frame 15 of the plate cylinder 20. Further, a pulley 37a is disposed on a transmission shaft 37 rotatably supported by the connection ring 33 on the driving side. Furthermore,
A plurality of driven pulleys 52 and tension pulleys 53 are rotatably disposed on the driving frame 15, and a second endless belt 54 is wound around the transmission pulley 51, the pulley 20 b, the pulley 37 a, the driven pulley 52 and the tension pulley 53. Have been. That is, the O of the tooth scratch 50
In the N state, the impression cylinder 19, the plate cylinder 20, and the ink transfer roll 28 are rotated in required directions by the driving of the drive motor 45 via the first and second endless belts 48, 54. All the pulleys are toothed pulleys, and the endless belt is also toothed.

A tooth brake 55 is disposed on the driven pulley 52 at an appropriate position, and the brake 55 applies a brake to the driven pulley 52 in an ON state to apply a brake to the second endless belt 54.
Of the driven pulley 52 in the OFF state.
Is configured to release the braking on the vehicle. The tooth brake 55 is set to operate in the opposite direction in synchronization with the ON-OFF operation of the tooth clutch 50,
The tooth brake 55 is turned off when the tooth clutch 50 is turned on, and the tooth brake 55 is turned on when the tooth clutch 50 is turned off.

The tension pulley 53 is connected to the frame 1
5 and is connected to an air cylinder 56 disposed on the frame 15 so as to always apply a required tension to the second endless belt 54. When the plate cylinder 20 moves toward or away from the impression cylinder 19, the air cylinder 56 transmits the pulley 51.
The tension pulley 53 is moved in accordance with a change in the distance between the shafts of the second endless belt 54 and the pulley 20b.

As shown in FIG. 5, the driving side frame 15
And a sprocket 57a disposed on the output shaft of the motor 57, and an end of the shaft portion 29a of the squeezing roll 29 extending outward from the eccentric housing 35 for squeezing roll. An endless chain 58 is wound around the sprocket 29b. The drive of the squeezing roll motor 57 causes the squeezing roll 29 to rotate in the opposite direction to the ink transfer roll 28.

[0026]

Next, the actual use of the printing apparatus according to the embodiment having the above-described configuration will be described. First, when printing is performed on a corrugated cardboard sheet, as shown in FIG. 3, in each printing unit 11, the plate cylinder 20 is positioned at the printing position in proximity to the impression cylinder 19 facing the fixed position. In addition,
When the plate cylinder 20 is positioned at the printing position, the tooth brake 55 is OFF and the tooth clutch 50
Is turned on. When the drive motor 45 is driven in this state, the impression cylinder 19 and the plate cylinder 20 are rotated in opposite directions via the first and second endless belts 48 and 54, and the ink transfer roll 28 is also moved to the plate cylinder. 20 is rotated in the opposite direction. The squeezing roll motor 57 is driven, and the squeezing roll 29 rotates at a low speed in a direction opposite to the ink transfer roll 28. Thereby, the ink transfer roll 28
The ink supplied between the printing press and the squeezing roll 29 is supplied to the printing plate mounted on the plate cylinder 20 via the ink transfer roll 28 in a state where the squeezing is adjusted.

From the sheet feeding device to the printing device 10,
The corrugated cardboard sheets supplied one by one are supplied between the impression cylinder 19 and the plate cylinder 20 in a state where the lower surface is supported by the sheet conveying device 16, and at this time, the sheets are subjected to required printing. The sheet conveying device 16 conveys the cardboard sheet, which is not printed by the printing device 10, by suction while holding the lower surface thereof, so that the printed surface of the cardboard sheet is not stained.

Next, when the corrugated cardboard sheet is passed through the printing apparatus without printing, or when the printing plate is exchanged in accordance with the order change, the tooth clutch 50 in the drive system is turned off and the tooth The brake 55 is turned on. In this state, the motor 2
When the plate cylinder 6 is driven in a predetermined direction, the plate cylinder eccentric housings 22, 22 rotate with respect to the frames 15, 15, whereby the plate cylinder 20 moves upward away from the impression cylinder 19 and is positioned at the rest position. (See FIG. 4). At this time, the tension pulley 53 is moved by the bias of the air cylinder 56, and the second endless belt 54 is moved so as to allow the center distance between the pulley 20b of the plate cylinder 20 and the transmission pulley 51 to be widened. In the case where only an arbitrary printing unit 11 is used, even if the plate cylinder 20 is moved to the rest position, the feeding of the corrugated cardboard sheet is surely performed by the sheet feeding device 16.

When the plate cylinder 20 moves to the rest position, the ink transfer rolls 28 connected via the first link members 32, 32 are also integrated without changing the center distance. To move up. Further, the ink transfer roll 28 and the squeeze roll 29 are connected to the ink brackets 36,3.
6, the distance between the axes of the two rolls 28, 29 does not change.

When the printing plate is changed in accordance with the change of the printing order, the operator mounts on the step 12, opens the door provided on the cover 13 covering the printing unit 11, and opens the printing cylinder 20 facing the rest position. Remove the printing plate wound around and mount the printing plate of the new order. In this case, as described above, the sheet conveying device 16 is of a type in which the lower surface of the corrugated cardboard sheet is suction-held and conveyed, so that there is no sheet conveying means above the pass line corresponding to the disposition position of Step 12. The position of the step 12 can be set low.

When printing is performed by the printing unit 11 in which the printing plate has been exchanged as described above, the elevating motor 26 is driven in the reverse direction, and the eccentric housing 2 for the plate cylinder is driven.
By rotating 2, 22 the plate cylinder 20 is moved closer to the impression cylinder 19 and positioned at the printing position (FIG. 3). At this time, the tension pulley 53 is
And the required tension is applied to the second endless belt 54 as the axial distance between the pulley 20b of the plate cylinder 20 and the transmission pulley 51 decreases. Next, the tooth cylinder 50 in the drive system is turned on and the tooth brake 55 is turned off, so that the impression cylinder 1 is turned off.
9 and plate cylinder 20 rotate in opposite directions.

As described above, in the printing apparatus 10 according to the embodiment, the plate cylinder 20 is moved with respect to the impression cylinder 19 by the eccentric drive mechanism 21.
Are configured to move close to and away from each other, so that the configuration can be simplified and the plate cylinder 20 can be accurately positioned. Further, since the second endless belt 54 is used as the drive system, the power transmission from the drive motor 45 accompanying the approach / separation movement of the plate cylinder 20 with respect to the impression cylinder 19 can be easily turned on / off. It is possible to easily cope with a change in the distance between the shaft and the plate cylinder 20.

As in the embodiment, the plate cylinder 20 is
In the apparatus which is configured to move the plate cylinder to approach / separate, the impression cylinder 19 and the plate cylinder 2 when the thickness of the cardboard to be printed changes.
Adjustment of the interval to zero can be shared by the eccentric drive mechanism 21. That is, since it is possible to cope without changing the position of the impression cylinder 19, the leading end of the corrugated cardboard sheet which is protruded from the pass line and conveyed by the sheet conveying device 16 abuts on the impression cylinder 19, causing printing displacement. No deformation or deformation.

[0034]

[Modification] In the above-described embodiment, the printing apparatus for overprinting in which the plate cylinder is arranged above the pass line of the corrugated cardboard sheet and the upper surface of the sheet is printed has been described, but the present invention is not limited to this. Instead, the plate cylinder is arranged below the pass line, and the plate cylinder is separated from the impression cylinder arranged above the pass line by the above-described eccentric drive mechanism, so that the underprinting is performed. It can also be adopted as a printing device for printing. In addition, when the printing by the printing apparatus is underprinting, the sheet conveying apparatus is configured to convey while sucking and holding the upper surface of the cardboard sheet, contrary to the embodiment. The conveying member in the sheet conveying device is not limited to the feed roller, but may be an endless belt that runs in the feeding direction of the cardboard sheet. Further, as the sheet conveying device, a pair of feed rollers vertically opposed with a pass line interposed therebetween can be adopted.

The drive system may employ a configuration in which each shaft is connected by a gear train instead of the combination of the pulley and the endless belt. Further, in the embodiment, the case where the printing apparatus is configured by three printing units has been described, but the number of the units may be one, two, or four or more. Further, supporting means for supporting the sheet material, which is arranged opposite to the plate cylinder,
It is not limited to the impression cylinder shown in the embodiment, but may be a means such as an endless belt. Furthermore, the squeezing means for adjusting the amount of ink to the ink transfer roll is not limited to the squeezing roll of the embodiment, and may be a scraper composed of a long plate body. The ink amount on the surface of the ink transfer roll is adjusted by directing the ink transfer roll in the forward or reverse direction with respect to the rotation direction, and adjusting the distance (pressing force adjustment) between the tip of the scraper and the roll surface. It is possible to adopt a configuration that does the following.

[0036]

As described above, according to the printing apparatus of the present invention, since the plate cylinder and the ink transfer roll are connected by the link member, the plate cylinder can be moved closer to or away from the support means. This can be done with a simple mechanism. Therefore, it is possible to suppress the occurrence of trouble when the plate cylinder is moved, and it is possible to reduce the cost and size. In addition, since the link member connecting the plate cylinder and the ink transfer roll and the link member connecting the ink transfer roll and the squeezing roll are rotatably provided on the frame, the weight of the portion moved by the displacement means is light. Therefore, the movement can be performed with a small driving source. Therefore, downsizing and cost reduction of the displacement means can be achieved. In addition, the plate cylinder can be moved in a short time, and the cycle time required for plate exchange can be shortened to improve production efficiency.

Further, since one side of the sheet material is conveyed while being sucked and held by the sheet conveying device, the sheet material can be surely conveyed even when the plate cylinder is separated from the support means. In addition, since it is not necessary to arrange a member for conveying the sheet material on the opposite side of the sheet conveying device with the sheet material pass line interposed therebetween, it is possible to reduce the height of the device. In addition, since the support means, the plate cylinder, and the ink transfer roll are driven by the endless belt, beneficial effects such as a simple change in the center distance between the support means and the plate cylinder can be obtained. Play.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a main part of the printing unit according to the embodiment in an unfolded state.

FIG. 3 is a schematic configuration diagram of a printing unit in a state where a plate cylinder according to an embodiment is positioned at a printing position.

FIG. 4 is a schematic configuration diagram of a printing unit in a state where a plate cylinder according to an embodiment is positioned at a rest position.

FIG. 5 is a schematic configuration illustrating a drive system of a printing unit according to the embodiment.

[Explanation of symbols]

15 Frame 17 Air Box 18 Feed Roller (Conveying Member) 19 Impression Cylinder (Supporting Means) 20 Plate Cylinder 20a Shaft 20b Pulley 21 Eccentric Drive Mechanism (Displacement Means) 22 Eccentric Housing for Plate Cylinder 22a Eccentric Through Hole 23 First Up / Down Gear 25 Lifting second gear 26 Lifting motor 28 Ink transfer roll 29 Squeezing roll (squeezing means) 29a Shaft 32 First link member 34 Second link member 35 Eccentric housing for squeezing roll 35a Eccentric through hole 37a Pulley 51 Transmission pulley 53 Tension pulley 54 Second endless belt C ₁ Center of rotation of eccentric housing for plate cylinder C ₃ Center of rotation of eccentric housing for drawing roll

Claims (8)

[Claims] 1. A plate cylinder (20) on which a printing plate is mounted, and a plate cylinder (2)
0), an ink transfer roll (28) that rotates in contact with the printing plate of the plate cylinder (20), and an ink amount that is in contact with the ink transfer roll (28). A squeezing means (29) for performing squeezing adjustment is provided, and while the ink is transferred to the printing plate by the ink transfer roll (28), a sheet material is passed between the plate cylinder (20) and the supporting means (19). And a pair of link members (32, 32) rotatably connecting and supporting the plate cylinder (20) and the ink transfer roll (28) in the printing apparatus configured to perform required printing on the sheet material. Without substantially changing the distance between the rotation center of the ink transfer roll (28) and the rotation center of the plate cylinder (20), the plate cylinder (20)
And a displacement means (21) for displacing the rotation center of the ink transfer roll (28) integrally with the plate cylinder (20) via the link member (32, 32). Printing device. 2. The ink transfer roll (28) and the squeezing means (29) are connected and supported by a pair of link members (34, 34) different from the link members (32, 32). The printing device according to 1. 3. The squeezing means comprises an ink transfer roll (28).
3. The printing apparatus according to claim 1, further comprising a squeezing roll (29) capable of adjusting a pressing force for adjusting the squeezing of the ink amount. 4. The ink transfer roll according to claim 1, wherein
3. The printing apparatus according to claim 1, wherein the printing apparatus is a long scraper which is capable of adjusting a pressing force so as to come into contact with and separate from the printhead and adjust an ink amount. 5. A pair of frames (15, 15) which are separated from each other in a direction intersecting the path line of the sheet material so as to be rotatable, and are deviated from a center of rotation (C ₁ ) by a required amount. The shaft portion (20a) of the plate cylinder (20) is inserted into the eccentric through hole (22a) formed by centering.
A link member (32) for connecting and supporting the plate cylinder (20) and the ink transfer roll (28) is rotatably fitted to the plate cylinder eccentric housing (22) for rotatably supporting the plate cylinder eccentric housing (22). The squeezing roll (29) is rotatably disposed on each of the pair of frames (15, 15), and is formed in an eccentric through hole (35a) formed eccentrically by a required amount from the center of rotation (C ₃ ). A link member (34) for connecting and supporting the ink transfer roll (28) and the squeezing roll (29) is rotatably mounted on an eccentric housing for squeezing roll (35) that rotatably supports the shaft portion (29a). Claim 3 which is externally fitted.
The printing device according to the above. 6. A pair of frames (1) separated from each other in a direction intersecting with a pass line of the sheet material.
Link members (32) that are rotatably disposed on each of (5, 15), and that connect and support the plate cylinder (20) and the ink transfer roll (28).
A plate cylinder eccentric housing (22), which is rotatably supported,
The eccentric housing for plate cylinder (22) is formed in the housing (22) eccentrically by a required amount from the center of rotation (C ₁ ) of the plate cylinder,
Eccentric through hole (22a) that rotatably supports the shaft (20a) of (20)
And a first gear (2) provided on the housing (22) at a center coinciding with the center of rotation (C ₁ ) of the eccentric housing for plate cylinder (22).
3) and a movement motor (26) for rotating the second gear (25) meshing with the first gear (23) in forward and reverse directions.
6. The printing device according to any one of 5. 7. An air box (17) whose inside is in a negative pressure state, and an air box (17) on the opposite side of the plate cylinder (20) across the sheet material pass line. A conveyance device (16) including a conveyance member (18) with which the sheet material sucked by the negative pressure formed inside the conveyance member (18) is provided, and the conveyance member (18) is driven by the driving force of the conveyance member (18). The printing apparatus according to any one of claims 1 to 6, wherein the sheet material that comes into contact with (18) is transported. 8. An endless belt (54) is commonly wound around pulleys (51, 20b, 37a) disposed on the support means (19), the plate cylinder (20) and the ink transfer roll (28), 2. The apparatus according to claim 1, wherein a change in an axial distance between the support means (19) and the plate cylinder (20) is allowed by moving a tension pulley (53) engaged with the endless belt (54). The printing device according to any one of claims 1 to 7,