JP2015003423A - Intaglio printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intaglio printing machine which effectively eliminates a failure caused by a solidified lump of ink in an inkpot device before printing on a sheet.SOLUTION: An intaglio printing machine comprises: a plate cylinder 14; a wiping roller 19; an impression cylinder 13; and an inking device 17 which directly or indirectly supplies ink I from an inkpot device 25 to the plate cylinder 14. The inking device 17 includes the inkpot device 25 comprising: a pot roller 26; a pot roller drive motor 42; an inkpot 30 in which ink I is stocked; an inkpot key 33 which is movably supported at the tip of the inkpot 30 to adjust a gap G between the inkpot 30 and the pot roller 26; and an inkpot key adjustment motor 43 which adjusts movement amount of the inkpot key 33. The intaglio printing machine includes a controller 40 which controls the inkpot key adjustment motor 43 and the pot roller drive motor 42 so that the inkpot key 33 is closed and the pot roller 26 is rotated before printing on a sheet W.

Description

  The present invention relates to an intaglio printing press, and more particularly to an intaglio printing press provided with an ink fountain device in an inking device for supplying ink to an intaglio cylinder.

  An example of this type of intaglio printing machine is disclosed in Patent Document 1.

  This includes a pressure roller that is rotatably supported by an eccentric bearing, and a bottom plate (pressure key) that is provided at a position where the tip is close to the pressure roller and forms a gap for supplying ink between the tip and the peripheral surface of the pressure roller. By rotating the eccentric bearing by the fountain roller moving means, the gap between the fountain roller and the fountain key can be adjusted by the same amount at a time, and the amount of ink supplied from the ink fountain to the fountain roller can be reduced for a short time. In addition to being able to make adjustments, it is possible to reduce waste paper.

JP 2006-321129 A

  By the way, in the intaglio printing press, ink that has oozed out from the position where the fountain key and the fountain roller are opposed to each other in the ink fountain device is integrated with the ink on the fountain roller and formed as an ink pool when printing stops. In the case of intaglio printing, especially indirect intaglio printing using an ink collecting cylinder, since ink with a low viscosity is used, if printing is started with the above ink pool formed on the acupoint roller, the film thickness of the ink pool is increased. There is a problem in that non-uniform portions are generated, thereby reducing print quality. Even in the case of direct intaglio printing that does not use an ink collecting cylinder, the same problem occurs when an ink having a low viscosity is used.

  The generation mechanism of the above-described printing failure will be described with reference to FIG. This figure shows the situation until the ink I supplied to the plate (plate) P from the inking device (not shown) is transferred (printed) to the sheet (paper) W. FIGS. 6A, 6E, and 6I show processes in which the ink I is supplied from the inking device to the plate P, and FIGS. 6B, 6F, and 6J show wiping that the plate P does not show. (C), (g), and (k) are the steps in which the ink I remaining in the groove of the plate P is transferred to the sheet W, and the steps (d), (h), and (h) in FIG. (L) shows a process in which the sheet W on which the ink I is transferred is separated from the plate P.

  As can be seen from FIG. 7, in the case of direct intaglio printing using high viscosity ink (x), the ink I supplied to the plate P is wiped well into the groove (image portion) of the plate P. It remains exactly (see step (a) → (b)). The remaining ink I is satisfactorily transferred to the sheet W (see the process of (b) → (c) → (d)).

  On the other hand, in the case of indirect intaglio printing using low viscosity ink (y), (z), if no ink pool is formed on the fountain roller of the ink fountain apparatus described above (y), OK (e) → (f) → (g) → (h) The ink I left almost exactly in the groove of the plate P at the time of wiping is transferred to the sheet W well, but the cured ink pool with high viscosity When C is formed in the groove (image line portion) of the plate, (i) in (z) results in a printing failure through the steps of (j) → (k) → (l) of NG. That is, in the step (j), the wiping roller for the low viscosity ink cannot be wiped well, and the ink I left in the groove of the plate P with the ink pool C protrudes from the groove of the plate P. As a result, it is transferred to the sheet W as it is in the process of (k) → (l), so that the picture becomes unclear and printing is poor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an intaglio printing machine that can effectively eliminate problems caused by ink stagnation in an ink fountain apparatus before printing on a sheet.

In order to achieve the above object, an intaglio printing press according to the present invention comprises:
An intaglio cylinder to which the plate is mounted;
A wiping roller for wiping excess ink on the plate in contact with the plate of the intaglio cylinder;
An impression cylinder for printing on the sheet facing the intaglio cylinder;
An inking device that supplies ink directly or indirectly to the intaglio cylinder;
With
The inking device is
Acupoint rollers,
Acupoint roller driving means for rotationally driving the acupoint roller;
An ink fountain that stores ink at the peripheral surface of the fountain roller with the tip opposed to the fountain roller;
A fountain key that is movably supported at the tip of the ink fountain and adjusts a gap with the fountain roller;
Acupoint key adjusting means for adjusting the amount of movement of the acupoint key;
Intaglio printing press equipped with an ink fountain device equipped with
A control device is provided for controlling the acupoint key adjusting means and the acupoint roller driving means so that the acupuncture key is closed and the acupuncture roller is rotated before the printing is performed on the sheet.

The intaglio printing machine is
A plurality of chablon cylinders to which ink is transferred from the inking device;
An ink collecting cylinder for transferring ink from the plurality of chablon cylinders to the intaglio cylinder;
It is an indirect intaglio printing press equipped with.

A wearing roller attaching / detaching device for attaching / detaching the wearing roller to / from the chablon body;
The control device controls the form roller attaching / detaching device so that the form roller is detached from the chablon cylinder when the point key is closed and the point roller is driven to rotate before printing is started. To do.

In order to achieve the above object, an intaglio printing method according to the present invention comprises:
In the intaglio printing method for printing on the sheet by supplying the ink from the ink fountain to the intaglio cylinder via the fountain roller, while passing the sheet between the intaglio cylinder and the impression cylinder facing the intaglio cylinder,
Before the printing is performed on the sheet, a key for adjusting a gap with the pressure roller is closed and the pressure roller is driven to rotate.

  According to the intaglio printing press according to the present invention, before printing is performed on the sheet after the printing press is operated, the fountain key in the ink fountain device is closed (the opening amount of the fountain key is set to zero), and the fountain roller is rotated for a predetermined time. By driving, the ink on the roller in the inking device can be returned to the ink fountain (this is called “fountain return”), and the ink on the fountain roller can be thinned (reset), and then the sheet is printed. When printing, good printing is performed with a uniform ink film thickness. That is, the problem caused by the ink pool formed on the acupoint roller is eliminated.

  According to the intaglio printing method of the present invention, after the printing press is operated and before printing is performed on the sheet, the fountain key in the ink fountain device is closed (the opening amount of the fountain key is set to zero), and the fountain roller is rotated for a predetermined time. By driving, the ink on the roller in the inking unit can be returned to the ink fountain, and the ink on the fountain roller can be thinned (reset), so when printing is subsequently applied to the sheet, it is better with a uniform ink film thickness Printing is performed. That is, the problem caused by the ink pool formed on the acupoint roller is eliminated.

1 is an overall schematic configuration diagram of an indirect intaglio printing press showing an embodiment of the present invention. It is an enlarged view of an ink apparatus part. It is detail drawing of an ink fountain apparatus part. It is a control block diagram of a key point return. It is explanatory drawing of a key point return. It is explanatory drawing of the example applied to a direct intaglio printing machine. It is explanatory drawing which shows the generation | occurrence | production mechanism of an ink pool.

  Hereinafter, an intaglio printing press according to the present invention will be described in detail with reference to the accompanying drawings.

  1 is an overall schematic configuration diagram of an indirect intaglio printing press according to an embodiment of the present invention, FIG. 2 is an enlarged view of an inking unit, FIG. 3 is a detailed view of an ink fountain unit, and FIG. FIG. 5 is an explanatory view of a key point return, and FIG. 6 is an explanatory view of an example applied directly to an intaglio printing press.

  An indirect intaglio printing machine generally indicated by reference numeral 1A in FIG. 1 prints a paper feed device 2 that feeds paper W as stacked sheets (see FIG. 7) one by one, and the fed paper W. The printing unit 3 and a paper discharge device 4 that discharges the printed paper W are schematically configured. The paper W fed one by one from the paper feeding device 2 to the differential plate 11 is held by the gripping claws of the swing device 12 with the top and bottom directions and the width direction regulated by a registering device (not shown).

  The printing unit 3 includes a three-times cylinder impression cylinder 13, a three-times cylinder cylinder (intaglio cylinder) 14 facing the impression cylinder 13 and having three plates attached in the circumferential direction, and the plate cylinder 14 Opposing four-fold cylinders of ink collecting cylinders 15, five chablon cylinders (partial printing cylinders) 16, which are single cylinders facing the ink collecting cylinders 15, and an ink device 17 for supplying ink to these chablon cylinders 16. And is roughly configured.

  In FIG. 1, reference numeral 18 denotes a transfer cylinder facing the impression cylinder 13, and the paper W replaced by the swing device 12 is replaced by a holding claw of the impression cylinder 13. Reference numeral 19 denotes a wiping roller that contacts the plate of the plate cylinder 14. Reference numeral 20 denotes a paper drum facing the impression cylinder 13, which is disposed between a sprocket (not shown) provided coaxially with the paper drum 20 and a sprocket 21 provided at the rear portion of the paper discharge device 4. The paper discharge chain 22 is stretched.

  In the indirect intaglio printing press 1 configured as described above, the paper W fed from the paper feeder 2 onto the difference plate 11 is replaced by the gripper of the impression cylinder 13 from the swing device 12 via the transfer cylinder 18. Are transported. At the same time, the ink of each ink device 17 is transferred to the ink collecting cylinder 15 via the chablon cylinder 16 and supplied onto the plate surface of the plate cylinder 14, and the excess ink supplied is removed by the wiping roller 19.

  Therefore, the paper W carried by the gripping claw of the impression cylinder 13 is printed when passing between the impression cylinder 13 and the intaglio cylinder 14 and is replaced by the paper ejection claw of the paper discharge chain 22 to be discharged. It is transported by the travel of the paper chain 22 and dropped and stacked on the paper stacking table 23.

  Next, the ink apparatus and the ink fountain apparatus, which are features of the present invention, will be described with reference to FIGS. As shown in FIG. 2, the ink device 17 includes an ink fountain device 25, a call roller 27 that is rotatably supported in contact with a fountain roller 26 that constitutes the ink fountain device 25, and a roller that is in contact with the call roller 27 and is rotatable. The swing roller 28 is supported so as to be movable in the axial direction, and the swing roller 28 and the two contact rollers 29 which are in contact with the chablon cylinder 16 are roughly constituted. All rollers from the acupoint roller 26 to the form roller 29 (in this embodiment, the acupoint roller 26, the calling roller 27, the swing roller 28, and the form roller 29) are rotated together by friction.

  The contact roller 29 is in contact with the swing roller 28 and the chablon cylinder 16 (shown by a solid line in FIG. 2), and is detached from the chablon cylinder 16 while being in contact with the swing roller 28 (in FIG. 2). (Shown by a dotted line).

  As shown in FIG. 3, the ink fountain device 25 includes an ink fountain 30 in which ink I is stored and a fountain roller 26 that is rotatably supported in front of the ink fountain 30. The ink fountain 30 is formed by being surrounded by a pair of left and right ink basins 31, a bottom plate 32, a fountain key 33, and a peripheral surface of the fountain roller 26, and ink I is stored therein.

  Then, the holding bar 35 is attached to the pot key support base 34 so as to extend in the axial direction of the pot roller 26. The key points 33 are arranged close to the peripheral surface of the pressure point roller 26, and a large number of key points 33 are arranged in the axial direction of the pressure point roller 26. The fulcrum pin 36 is formed to have the same length as the holding bar 35, and the key 33 is pulled by the resilient force of the disc spring 37 and is held by the holding bar 35 via the fulcrum pin 36. The acupoint key 33 is provided with a concave groove (not shown) formed in an arc shape that is in sliding contact with the sliding contact surface of the fulcrum pin 36.

  Therefore, the key 33 is supported by the holding bar 35 so as to be swingable with the sliding contact surface of the fulcrum pin 36 as a swing fulcrum. Then, by swinging each pressure key 33, the gap between the peripheral surface of the pressure roller 26 changes and the ink supply amount is adjusted. Each acupoint key 33 is swung by the advancing and retreating movement of the corresponding acupoint key opening / closing screw rod 38 (see the ED arrow). The acupoint key opening / closing screw rod 38 advances and retreats when the rotation of the acupoint key adjusting motor (the acupoint key adjusting means) 43 is transmitted via the gear mechanism 39.

  In this embodiment, the acupoint key adjustment motor 43 described above is configured so that the acupoint key 33 is closed and the acupoint roller 26 is driven to rotate for a predetermined time before the printing on the paper W after the printing press is operated. A controller 40 that drives and controls a point roller driving motor (point roller driving means) 42, which will be described later, and drives and controls a roller detaching device 44, which will be described later, which moves the roller 29 described above to the position of attachment and detachment at that time. Prepare.

  That is, as shown in FIG. 4, the control device 40 composed of a microcomputer or the like receives a signal from a print start switch 41 operated by an operator, and at a predetermined time (in other words, the printing press) after the signal is input. During a predetermined period during the slow motion operation, drive signals are output to the pressure point roller drive motor 42, the pressure point key adjustment motor 43, and the form roller attachment / detachment device 44. As the form roller attaching / detaching device 44, a known one disclosed in Patent Document 1 including an air cylinder, a bracket, and the like is used.

  With this configuration, the fountain key 33 in the ink fountain device 25 is closed by the fountain key adjustment motor 43 via the fountain key opening / closing screw rod 38 before the printing is performed on the paper W after the printing press is operated ( At the same time, the opening amount of the key point 33 is set to zero), and the pressure point roller drive motor 42 rotates the pressure point roller 26, the calling roller 27, the swing roller 28, and the dosing roller 29 at a predetermined rotation speed for a predetermined time.

Here, when the opening amount of the key point 33 is set to zero, the key point 33 and the pressure point roll 26 are not in contact with each other. The gap G between the fountain key 33 and the fountain roll 26 is very close (narrow) to zero, and the amount of ink I flowing from the ink fountain 30 to the fountain roll 26 is not zero, but is extremely small, and the ink I is extremely thin on the peripheral surface of the fountain roll 26. It is formed in a film shape (see FIG. 5).

  As a result, the ink I on the fountain roller 26 is returned to the bottom plate 32 of the ink fountain 30 (this is referred to as “fountain return”). That is, even if an ink reservoir is formed in the inking device 17, most of the ink I on the fountain roller 26, the calling roller 27, the swing roller 28, and the form roller 29 in the inking device 17 is the ink I stored in the ink fountain 30. Therefore, the ink I on the point roller 26, the calling roller 27, the swing roller 28, and the form roller 29 is thinned (reset).

  Subsequently, the control device 40 determines that the gap G between the acupoint key 33 and the acupoint roll 26 corresponds to the pattern information and the printing speed after the “returning point” after the printing press is operated and before the paper W is printed. The key key adjustment motor 43 is driven and controlled so that the key opening becomes the same.

  As a result, at the time of steady operation after the slow operation of the printing press, good printing is performed with a uniform ink film thickness T. That is, the problem caused by the ink pool formed on the fountain roller 26 is eliminated.

  Further, in this embodiment, during the "point turning", since the form roller 29 is detached from the chablon cylinder 16 by the form roller attaching / detaching device 44, all the rollers from the point roller 26 to the form roller 29 of the inking device 17 (this embodiment) In the example, since the “fountain return” is performed in the fountain roller 26, the calling roller 27, the swing roller 28, and the form roller 29), the ink film thickness T is made more uniform in the inking device 17.

  In addition, after the “return of key point”, the gap G between the pressure point key 33 and the pressure point roll 26 becomes a key opening suitable for the pattern information and the printing speed, so that there is no ink pool and the ink film thickness suitable for printing to be performed in the future. T can prepare for printing.

  In the above embodiment, the indirect intaglio printing machine 1A has been described as an example. However, as shown in FIG. 6, the ink I is transferred from the ink fountain device 25 of the ink device 17 to the chablon cylinder 16, and the chablon cylinder 16 is transferred. The present invention may be applied to a direct intaglio printing machine 1B that directly transfers ink to the intaglio cylinder 14 without passing through the ink collecting cylinder 15 so as to correspond to the ink I having a low viscosity. In FIG. 6, the same members as those in FIG.

  Needless to say, the present invention is not limited to the above-described embodiments, and various changes such as the configuration of the inking device and the cylinder diameter of each cylinder can be made without departing from the scope of the present invention.

  Further, in the above-described embodiment, the acupoint key 33 is swung to change the gap G between the acupoint roller 26. For example, the acupuncture key 33 is a flat plate sandwiched between the holding bar 35 and the bottom plate 32. The gap G between the holding roller 35 and the bottom plate 32 may be changed by sliding the holding bar 35 and the bottom plate 32. In other words, the acupoint key and the acupuncture key adjusting means in the present invention may be any means as long as the acupoint key 33 can be moved and the gap G between the acupoint key 33 and the acupoint roller 26 can be changed by the movement of the acupoint key 33.

DESCRIPTION OF SYMBOLS 1A Indirect intaglio printing machine 1B Direct intaglio printing machine 2 Paper feeder 3 Printing part 4 Paper discharge apparatus 11 Difference board 12 Swing apparatus 13 Impression cylinder 14 Plate cylinder (intaglio cylinder)
15 Ink collecting cylinder 16 Chablon cylinder (partial cylinder)
DESCRIPTION OF SYMBOLS 17 Inking apparatus 18 Transfer cylinder 19 Wiping roller 20 Paper take-up cylinder 21 Sprocket 22 Discharge chain 23 Paper stacking base 25 Ink fountain apparatus 26 Fountain roller 27 Calling roller 28 Swing roller 29 Forming roller 30 Ink fountain 31 Ink mark 32 Bottom plate 33 Fountain key support base 34 35 holding bar 36 fulcrum pin 37 disc spring 38 point key opening and closing screw rod 39 gear mechanism 40 controller 41 print start switch 42 point roller drive motor (point roller drive means)
43 Key point adjustment motor (Key point adjustment means)
44 Forming roller attaching / detaching device I Ink P plate (plate)
W Paper (sheet-like material)
C Ink pool G Gap between tsubo key and tsubo roll T Ink film thickness on various rollers of inking machine

Claims (4)

An intaglio cylinder to which the plate is mounted;
A wiping roller for wiping excess ink on the plate in contact with the plate of the intaglio cylinder;
An impression cylinder for printing on the sheet facing the intaglio cylinder;
An inking device that supplies ink directly or indirectly to the intaglio cylinder;
With
The inking device is
Acupoint rollers,
Acupoint roller driving means for rotationally driving the acupoint roller;
An ink fountain that stores ink at the peripheral surface of the fountain roller with the tip opposed to the fountain roller;
A fountain key that is movably supported at the tip of the ink fountain and adjusts a gap with the fountain roller;
Acupoint key adjusting means for adjusting the amount of movement of the acupoint key;
Intaglio printing press equipped with an ink fountain device equipped with
An intaglio printing comprising a controller for controlling the acupoint key adjusting means and the acupoint roller driving means so that the acupoint key is closed and the acupuncture roller is driven to rotate before the printing is performed on the sheet. Machine. The intaglio printing machine is
A plurality of chablon cylinders to which ink is transferred from the inking device;
An ink collecting cylinder for transferring ink from the plurality of chablon cylinders to the intaglio cylinder;
The intaglio printing press according to claim 1, wherein the intaglio printing press comprises: A wearing roller attaching / detaching device for attaching / detaching the wearing roller to / from the chablon body;
The control device controls the form roller attaching / detaching device so that the form roller is detached from the chablon cylinder when the point key is closed and the point roller is driven to rotate before printing is started. The intaglio printing machine according to claim 2. In the intaglio printing method for printing on the sheet by supplying the ink from the ink fountain to the intaglio cylinder via the fountain roller, while passing the sheet between the intaglio cylinder and the impression cylinder facing the intaglio cylinder,
An intaglio printing method comprising: closing a key for adjusting a gap with the pressure point roller and driving the pressure roller before printing on the sheet.

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