JP5342495B2 - Corrugated sheet printing machine - Google Patents

Description

  The present invention relates to corrugated cardboard printing, and relates to a corrugated cardboard printing machine capable of omitting discarded plates.

In multi-color corrugated cardboard sheet printing, if a shift between colors occurs, the printing is blurred and the commercial value is lowered.
Deviation of colors is and the feed speed variation caused by warpage of the cardboard sheet, caused by the inclination occurs in the corrugated board sheet in the feeding surface.

Corrugated cardboard sheet is fed by rotating the feed roll with the corrugated cardboard sheet inserted between the feed rolls. There is a method (Patent Document 1) in which a corrugated cardboard sheet is adsorbed to a suction belt that slidably contacts with a box and is rotated.
The roll type is superior in terms of feed stability and maintenance.

JP-A-8-323957

  In the case of Patent Document 1, since the suction boxes are located on the downstream side and the upstream side of the plate cylinder and project from the frame of the unit, the printing unit is fixed with the gap between the printing units adjacent to each other in the feeding direction open. It can be implemented only on fixed printers. A printing unit open / close type printing machine that can open and close between adjacent printing units cannot be implemented if the suction box is in the way.

  In the feeding method in which the corrugated board sheet is inserted between the feeding rolls, the feeding roll is in contact with the corrugated cardboard sheet. For this reason, in order to enable feeding of a corrugated sheet having a shorter length in the feeding direction than between feeding rolls of adjacent printing units, a discard plate is attached to the plate cylinder, and the discard plate is used as a corrugated sheet feed assisting means. There is a need to. The work increases as much as the discarded version is installed.

In particular, when printing with a smaller number of colors than the number of printable colors, a discarded plate must be mounted on a plate cylinder of a printing unit not mounted with a printing plate, which is troublesome.
In addition, the discarded plate is set on the plate cylinder so as to contact both the left and right ends with respect to the running direction of the corrugated cardboard sheet, and unnecessary ink is transferred to the portion of the corrugated cardboard sheet by the discarded plate. The part must be rounded down. Therefore, a cardboard sheet that is as large as the cut-off amount is required, which is a waste of resources.
The present invention clarifies a printing machine that can solve the above-mentioned problems without impairing the advantages of the feed roll system.

The corrugated cardboard printing apparatus of the present invention is a corrugated cardboard printing machine comprising a plurality of printing units (1) (1a) (1b) arranged in the feeding direction of the corrugated cardboard sheet S.
Each of the plural printing units (1), (1a) and (1b) performs printing by passing the corrugated cardboard sheet S traveling by the feeding means (5) between the plate cylinder (2) and the receiving member (3). Yes,
The feeding means (5) includes a main feeding device (6) for sandwiching the corrugated sheet S between the feeding rolls (61) and (62) and feeding the corrugated sheet by rotation of the feeding rolls (61) and (62); It consists of an auxiliary feeding device (7) that guides in the feeding direction while correcting warpage,
The main feeding device (6) is arranged downstream of the auxiliary feeding device (7) in the feeding direction of the cardboard sheet S,
The auxiliary feeding device (7) has a long opening (86) in the axial direction of the plate cylinder (2) for accommodating the receiving member (3) and projecting the cardboard sheet contact portion of the receiving member, and the blower (76) A suction box (8) linked to the
The suction box (8) is provided in the suction box (8) by allowing a part of the peripheral surface to protrude from the hole (87) opened on the plate cylinder (2) side of the suction box (8). And a feed auxiliary roll (9) that is driven to correctively rotate in the cardboard sheet feeding direction in accordance with the feeding speed of the cardboard sheet S by the main feeding device (6) .
The inside of the suction box (8) is divided into a plurality of chambers (85), (85) in the axial direction of the plate cylinder (2) by a partition plate (84) cut into a shape that does not interfere with the receiving member (3). 85), and each room (85) communicates with the blower (76) through the header duct (88), and between each room (85) and the header duct (88), the valve hole (80) is provided in the bottom plate (82) of the suction box (8), and for each valve hole (80), the valve plate (89) that closes the valve hole (80) from the outside of the bottom plate (82) is a header duct. The valve plate (89) is connected to the valve plate opening / closing device (71).

In the corrugated cardboard sheet printing apparatus of the present invention , the feeding auxiliary roll (9) may be arranged before and after the corrugated sheet feeding direction across the opening (86) of the suction box (8).

In the corrugated cardboard sheet printing apparatus of the present invention , a plurality of auxiliary feeding rolls (9) may be provided coaxially.

In the corrugated cardboard sheet printing apparatus of the present invention , the adjacent printing units (1) (1a) (1b) may be configured to be openable and closable.

In the corrugated cardboard printing apparatus of the present invention , the receiving member (3) is disposed below the plate cylinder (2), and the suction box (8) is a top plate (above the receiving member (3) ( 81), and the opening (86) and the hole (87) are formed in the top plate (81), and the front edge (81a) of the top plate (81) and the rear of the opening (86) The edge (81b) may be inclined downward so that the traveling cardboard sheet S is not caught.

In the corrugated cardboard printing apparatus of the present invention , the feeding means (5) for the corrugated cardboard sheet S comprises a main feeding device (6) and an auxiliary feeding device (7), and the main feeding device (6) is a feeding roll (61) (62). ) And the cardboard sheet S is fed by rotation of the feed rolls (61) and (62).

The auxiliary feeding device (7) has a slit-like gap formed by the opening (86) of the suction box (8) and the receiving member (3) protruding from the opening, and a hole (87 in the suction box (8)). ) And the feeding auxiliary roll (9), the corrugated sheet S being drawn is sucked toward the suction box (8) by the suction force acting on the gap formed between the feeding auxiliary roll (9) and the cardboard sheet S is fed to the feeding auxiliary roll (9). ) Side can be pressed. Therefore, the warpage of the corrugated cardboard sheet can be corrected, the frictional force between the feeding auxiliary roll (9) and the corrugated cardboard sheet can be increased, and the corrugated cardboard sheet S is sent out auxiliary by rotation in the traveling direction of the feeding auxiliary roller (9). be able to.
For this reason, the corrugated cardboard sheet S can be sent out stably without mounting the discard plate on the plate cylinder (2). There is no need to allow for the cost of discarding corrugated cardboard sheets, which can improve yield and reduce waste of paper resources.

  Since the suction box (8) has only to be large enough to accommodate the receiving member (3) and the auxiliary feeding roll (9), the front-rear width is the same as that of the conventional printing apparatus without the suction box (8) in the present invention. Can be suppressed.

In the corrugated cardboard printing apparatus of the present invention , the suction box (8) is partitioned into a plurality of chambers (85) (85) (85) in the axial direction of the plate cylinder (2) by a partition plate (84), Each chamber (85) communicates with or is disconnected from the header duct (88) by opening and closing the valve plate (89), and suction ON-OFF switching is possible for each room. Since the suction can be applied only to the room (85) corresponding to the area, it is possible to eliminate wasteful use of the suction to the room in the area where the cardboard sheet does not pass.

In the corrugated cardboard printing apparatus according to the present invention , the feeding auxiliary roll (9) is arranged more or less in the feeding direction across the opening (86) for receiving the receiving member of the suction box (8), so that it is more stable. Thus, it can serve as a feeding assist and can enhance the effect of correcting the warpage of the cardboard sheet .

In the corrugated cardboard sheet printing apparatus according to the present invention , a plurality of auxiliary feeding rolls (9) are provided coaxially, so that the configuration of the drive system of the auxiliary feeding roll (9) can be simplified.

In the corrugated cardboard printing apparatus of the present invention , the warpage of the corrugated cardboard sheet S is corrected by the individual printing units (1), (1a), and (1b), and stable feeding can be realized at a constant speed. It is possible to prevent misalignment between the print colors in 1a) and 1b) and prevent the printing from blurring.

It is a longitudinal section of a printing machine. It is the perspective view which fractured | ruptured a part of auxiliary feeder. It is a front view of an auxiliary feeder. It is a top view of an auxiliary feeder. It is a front view of a valve plate opening / closing device.

FIG. 1 shows a three-color printing press comprising three printing units (1) (1a) (1b).
Each printing unit (1) (1a) (1b) has the same configuration, and includes a printing device (10) capable of single-color printing alone.
Each printing unit (1) (1a) (1b) is movably arranged on the rail (12), and the adjacent printing units (1) (1a) (1b) are closed during printing operation. It is possible to open between adjacent printing units (1) and (1a) and / or between (1a) and (1b) as necessary, for example, when the printing plate (22) to be attached / detached or during maintenance.
The corrugated board sheet S is sent in order from the upstream (front) printing unit (1) to the downstream (rear) printing units (1b) and (1c) for printing.

The printing apparatus (10) is provided with a cylindrical plate cylinder (2) and a receiving member (3) in the frame (11) so as to face each other in the vertical direction.
The plate cylinder (2) and the receiving member (3) rotate in opposite directions at a peripheral speed corresponding to the feeding speed of the cardboard sheet S.
A plate (22) is mounted on the plate cylinder (2).

An ink supply device (4) is provided in the vicinity of the plate cylinder (2), and ink is supplied to the plate cylinder (2) by the ink supply device.
The ink supply device (4) of the embodiment stores ink in an ink reservoir (43) formed between two ink application rolls (41) and (42), and has both ink application rolls (41) and (42). The inks are rotated in the opposite directions in the direction of squeezing the ink, and the ink adhering to the ink application roll (41) on the plate cylinder (2) side is transferred to the printing plate (22). However, the configuration of the ink supply device (4) is not limited.

In the frame (11), a feeding means (5) for the cardboard sheet S is provided.
The feeding means (5) comprises a main feeding device (6) and an auxiliary feeding device (7) for guiding the cardboard sheet S to the feeding means (5) while correcting the warp.

  The main feeding device (6) sandwiches the travel path of the corrugated cardboard sheet S passing between the plate cylinder (2) and the receiving member (3), and the downstream side of each of the plate cylinder (2) and the receiving member (3). And a pair of feed rolls (61) and (62) that rotate in the direction in which the corrugated sheet S is fed to the downstream side.

  The auxiliary feeding device (7) is connected to the suction box (8) containing the receiving member (3) and a feeding auxiliary roll (9) described later, and the suction box (8) via the header duct (88). And a blower (76).

The suction box (8) is composed of side plates (83) and (83) positioned on the front and rear sides of the receiving member (3), a top plate (81) located above the receiving member (3), and the receiving member (3). The bottom plate (82) located below is slightly longer than the receiving member (3), and the left and right ends are closed.
The inside of the suction box (8) is partitioned by a plurality of partition plates (84) so that a plurality of rooms (85) (85) are arranged in the axial direction of the receiving member (3).
In the embodiment, the suction box (8) is partitioned into nine chambers (85), and the horizontal length of the central chamber (85a) substantially corresponds to the minimum width of the printable cardboard sheet S. It is about twice as long as other rooms (85).
The partition plate (84) is cut into a shape in which a slight gap is generated between the receiving member (3) and a feed auxiliary roll (9) described later and does not interfere with both.

The top plate (81) has an opening (86) directly above the axis of the receiving member (3) so that the peripheral surface of the receiving member (3) protrudes slightly higher than the top plate (81). ) Has been established over almost the entire length.
In the embodiment, the protruding height of the receiving member (3) from the opening (86) of the top plate (81) is about 1 mm from the upper surface of the top plate (81).
A slit-like gap having a width of 2 to 5 mm is formed between the opening edge of the top plate (81) and the receiving member (3).
The front edge (81a) of the top plate (81) and the rear edge (81b) of the opening (86) are inclined downward so that the corrugated cardboard sheet S is not caught.

In the top plate (81), a plurality of rectangular holes (87) are formed at approximately equal intervals in two rows along the opening before and after the opening (86).
The feed auxiliary roll (9) is disposed in the suction box (8) so that it slightly protrudes from the holes (87) on the top plate (81), and penetrates the axis of the feed auxiliary roll of each row. The common shafts (91) and (91) are fitted.
The projecting height of each auxiliary feeding roll (9) from the top surface of the top plate (81) is the same as that of the receiving member (3).
Between the hole edge of each hole (87) of the top plate (81) and the auxiliary feeding roll (9), a slit-like gap having a width of 2 to 5 mm is generated.

  The axis (91) of the above-mentioned feed auxiliary roll (9), the axis (21) of the plate cylinder (2), the axis (31) of the receiving member (3), and the double-feed roll (61) of the main feed device (6) ( 62) are connected to a common rotation drive device (13) so that their peripheral speeds are the same.

The bottom plate (82) of the suction box (8) is provided with a header duct (88) having a length extending over the entire room of the suction box (8), and the suction box (8) and the header are attached to the bottom plate (82). A valve hole (80) communicating with the duct (88) is opened.
A valve plate (89) is detachably attached to each valve hole (80), and a valve plate opening / closing device (71) is connected to the valve plate (89).

The valve plate opening / closing device (71) pivotally connects the piston rod (73) of the cylinder (72) and the rotation support shaft (74) of the valve plate (89) supported by the link plate (75). The valve plate (89) is rotated by opening and closing of the piston rod (73) to open and close the valve hole (80).
Each valve plate opening / closing device (71) is controlled according to the width of the corrugated cardboard sheet S to be printed, and at the minimum width, only the valve hole (80) of the central chamber (85a) of the suction box (8) is opened. As the width of the cardboard sheet S increases, the number of rooms for opening the valve holes (80) is increased.
In the chamber (85) in which the valve hole (80) is opened, the gap between the opening (86) of the suction box (8) and the receiving member (3), between the hole (87) and the feed auxiliary roll (9). In the gap, a force is applied to the corrugated sheet S passing between the plate cylinder (2) and the receiving member (3) toward the top plate (81) of the suction box (8).
The blower (76) is controlled so that the suction force does not become too large according to the number of rooms in which the valve holes (80) are opened.

  As described above, in each printing unit (1) (1a) (1b) constituting the corrugated cardboard printing machine, the corrugated cardboard sheet feeding means (5) is composed of the main feeding device (6) and the auxiliary feeding device (7). Thus, the main feeding device (6) sandwiches the cardboard sheet S between the feeding rolls (61) and (62) and feeds the cardboard sheets by the rotation of the feeding rolls (61) and (62). it can.

The auxiliary feeding device (7) includes a slit-like gap perpendicular to the feeding direction of the cardboard sheet formed by the opening (86) of the suction box (8) and the receiving member (3) protruding from the opening, and the suction The traveling corrugated cardboard sheet S is sucked to the suction box (8) side by a suction force acting on a gap formed between the hole (87) of the box (8) and the auxiliary feeding roll (9). That is, since the corrugated cardboard sheet S is pressed toward the feed auxiliary roll (9), the warpage of the corrugated cardboard sheet can be effectively corrected, and the corrugated cardboard sheet is supplemented by the rotation of the feed auxiliary roll (9) in the cardboard sheet running direction. Can be sent out.
In this way, since the corrugated sheet S can be sent out stably without mounting the discard plate on the plate cylinder (2), it is not necessary to allow for the cut-off cost of the corrugated cardboard sheet by the discard plate, thereby improving the yield. This can reduce the waste of paper resources.

  In the embodiment, the feed assist roll (9) is arranged on both sides in the feed direction with the receiving member projecting opening (86) of the suction box (8) interposed therebetween, so that the role of feed assist is more stable. And can further contribute to the correction of the warpage of the cardboard sheet.

The above description is provided to illustrate the present invention and should not be construed as limiting the invention described in the claims or reducing the scope thereof. The structure of each part of the present invention is not limited to the above embodiments, it is Ru course der various modifications are possible within the technical scope described in the appended claims.

For example, as in the embodiment, it is desirable to provide the auxiliary feeding rolls (9) and (9) before and after the receiving member (3), but it may be provided only at either the front or rear.
Further, although the auxiliary feeding roll (9) of the embodiment is provided on the shaft (91) at substantially equal intervals, it can be a long roll having substantially the same length as the receiving member (3). In this case, the feed auxiliary roll protruding hole (87) of the suction box (8) may be a horizontally long slot in the same manner as the opening (86) from which the receiving member (3) protrudes. 8) Each partition plate (84) for partitioning the inside may be cut at a portion that interferes with the long feed auxiliary roll.

  Although the receiving member (3) of the embodiment is a rotating cylinder, the present invention is not limited to this, and the plate cylinder (2) can support the portion where the cardboard sheet is pressed, and the resistance of the cardboard sheet to travel is reduced. If it is formed like this, it does not matter whether the shape of the receiving member (3) or the receiving member (3) rotates.

DESCRIPTION OF SYMBOLS 1 Printing unit 2 Plate cylinder 3 Receiving member 4 Ink supply device 5 Feed device 6 Main feed device 7 Auxiliary feed device 8 Suction box
80 Valve hole
81 Top plate
84 Partition plate
85 rooms
86 opening
87 holes
88 Header duct 9 Feeding auxiliary roll

Claims (5)

In cardboard sheet printing units of a plurality groups arranged in the feed direction of the S (1) (1a) cardboard sheet printing press and a (1b),
Each of the plurality of printing units (1), (1a) and (1b) performs printing by passing the corrugated sheet S traveling by the feeding means (5) between the plate cylinder (2) and the receiving member (3). ,
The feeding means (5) includes a main feeding device (6) for sandwiching the corrugated sheet S between the feeding rolls (61) and (62) and feeding the corrugated sheet by rotation of the feeding rolls (61) and (62); It consists of an auxiliary feeding device (7) that guides in the feeding direction while correcting warpage,
The main feeding device (6) is arranged downstream of the auxiliary feeding device (7) in the feeding direction of the cardboard sheet S,
The auxiliary feeding device (7) has a long opening (86) in the axial direction of the plate cylinder (2) for accommodating the receiving member (3) and projecting the cardboard sheet contact portion of the receiving member, and the blower (76) A suction box (8) linked to the
The suction box (8) is provided in the suction box (8) by allowing a part of the peripheral surface to protrude from the hole (87) opened on the plate cylinder (2) side of the suction box (8). And a feed auxiliary roll (9) that is driven to correctively rotate in the cardboard sheet feeding direction in accordance with the feeding speed of the cardboard sheet S by the main feeding device (6) .
The inside of the suction box (8) is divided into a plurality of chambers (85), (85) in the axial direction of the plate cylinder (2) by a partition plate (84) cut into a shape that does not interfere with the receiving member (3). 85), and each room (85) communicates with the blower (76) through the header duct (88), and between each room (85) and the header duct (88), the valve hole (80) is provided in the bottom plate (82) of the suction box (8), and for each valve hole (80), the valve plate (89) that closes the valve hole (80) from the outside of the bottom plate (82) is a header duct. (88) A corrugated cardboard printing machine provided in the valve plate (89) and connected to the valve plate opening / closing device (71) .   The corrugated cardboard printing machine according to claim 1, wherein the auxiliary rolls (9) are arranged before and after the opening (86) of the suction box (8) in the cardboard sheet feeding direction.   The corrugated cardboard printing machine according to claim 1 or 2, wherein a plurality of feed auxiliary rolls (9) are provided coaxially. The corrugated cardboard printing machine according to any one of claims 1 to 3, wherein the adjacent printing units (1) (1a) (1b) are configured to be openable and closable . The receiving member (3) is arranged below the plate cylinder (2),
The suction box (8) includes a top plate (81) located above the receiving member (3), and the opening (86) and the hole (87) are opened in the top plate (81). ,
The front edge (81a) of the top plate (81) and the rear edge (81b) of the opening (86) are inclined downward so that the running cardboard sheet S is not caught. A cardboard sheet printing machine according to any one of the above.

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