JP2005014369A - Carton making machine for corrugated cardboard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carton making machine for a corrugated cardboard sheet constituted so as to apply printing, channeling, ruling and the like to the corrugated cardboard sheet and to easily use a printing plate different in thickness. <P>SOLUTION: In the carton making machine for the corrugated cardboard sheet equipped with a printing part 40 for attaching the printing plate 12 different in thickness to a printing cylinder 41 to apply printing to the corrugated cardboard sheet 3, a feed means 50 for feeding the corrugated cardboard sheet 3 and a control means 81 capable of independently controlling the operation of the feed means 50 and the operation of the printing part 40 are provided to the printing part 40 and the feed speed of the feed means 50 is corrected corresponding to the outer diameter of the printing cylinder 41 including the printing plate 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box making machine for corrugated cardboard sheets which performs printing, grooving, ruled lines, etc. on corrugated cardboard sheets.
[0002]
[Prior art]
FIG. 5 is a diagram showing a schematic configuration of a corrugated box making machine that performs printing, grooving, ruled lines, etc. on a corrugated cardboard sheet. Corrugated cardboard sheets 3 are stacked on the table 2 of the sheet feeding unit 1, and the lowermost sheet is kicked out one by one by a kicker 5 that reciprocates by a crank lever mechanism 4 or the like and sent to a feed roll 6. . The feed roll 6 is composed of a pair of upper and lower sides and is rotated at a constant speed. The feed roll 6 is pulled out with the corrugated cardboard sheet 3 kicked out by the kicker 5 and sent to the next printing unit 10.
[0003]
FIG. 5 shows the configuration of the printing unit 10 in the case of printing four colors. For this reason, four printing units are provided. A printing cylinder 11 is provided in the printing unit 10, and a printing plate 12 is attached to the cylinder 11. An ink supply roll (ink roll) 13 that abuts the printing plate 12 and an ink chamber 14 that stores printing ink are provided in the vicinity of the printing cylinder 11.
[0004]
Ink is supplied from the ink chamber 14 to the surface of the ink supply roll 13, and this ink is transferred to the printing plate 12. A receiving roll 15 is provided below the printing cylinder 11, and the corrugated cardboard sheet 3 is printed while being sandwiched between the printing plate 12 and the receiving roll 15.
Further, a feed roll 16 is provided on the downstream side of the printing cylinder 11, and the cardboard sheet 3 is conveyed to the next printing cylinder 11 by the feed roll 16.
[0005]
When printing is completed, the corrugated cardboard sheet 3 is then sent to the slotter creaser unit 20. The cardboard sheet 3 is creased by the first crease roll 21 and the second crease roll 24 in the slotter creaser section 20 and grooved by a slotter knife 23 attached to the slotter head 22. . Although the details are not shown, the corrugated cardboard sheet 3 processed by the slotter cleaner 20 is further sent to the next processing step, for example, a punching unit or a folding unit.
[0006]
The paper feed mechanism, each roll, and the machining head described above are connected by a mechanical power transmission mechanism such as a gear train and a line shaft (not shown), and are driven by the same drive source. Further, the feed roll 6 of the paper feeding unit 1, the printing plate 12 of the printing unit 10, the ink supply roll 13, the receiving roll 15, the feeding roll 16, the ruled line rolls 21, 24, the slotter head 22 of the slotter crease unit 20, etc. are all the same. Driven at speed.
[0007]
As a matter of course, the kicker 5, the printing cylinder 11 and the slotter head 22 are set to synchronize, that is, each time the kicker 5 sends out one sheet, the printing cylinder 11 and the slotter head 22 are set to rotate once. ing.
In addition, there exists the following nonpatent literature 1 as prior art literature information.
[0008]
[Non-Patent Document 1]
Catalog, CUIR Rotaflexo Mark 2, Corrugated post print system France 1997
[0009]
[Problems to be solved by the invention]
Incidentally, the conventional corrugated board box making machine configured as described above has the following problems.
Conventionally, as a printing plate for printing on a corrugated cardboard sheet, a method (engraving method) in which a flat rubber is carved by a machine or by hand to form a printed figure has been widely used. The printing plate produced in this way has a relatively thick thickness (usually around 7 mm), and printing is often so-called solid printing.
[0010]
However, in recent years, the demand for cosmetic printing has increased, and the expression of shading and color by halftone dots, which is the same as that of ordinary printing machines, has also been required for the printing of cardboard sheets. In order to meet such demands, it is difficult to produce plates with conventional engraving methods, and therefore, photosensitive resin plates and the like have come to be used. Has come to be required.
[0011]
Further, when the thickness of the printing plate is thick as in the prior art, there is a problem in that the printing plate is elastically deformed due to various causes during mounting or printing, resulting in a decrease in printing accuracy. In view of this point, in recent years, the thickness of the printing plate tends to become gradually thinner (mostly around 3 mm).
The stamp for corrugated cardboard sheets is not disposable and is used repeatedly for a fairly long time. Therefore, the cardboard factory stores many kinds of printing plates from old thick printing plates to the latest high-precision thin printing plates, and these are repeatedly used.
[0012]
On the other hand, the number of box making machines in a corrugated board factory is limited, so it is necessary to use various types of printing plates with one box making machine. However, since the diameter of the printing cylinder itself is constant, when the printing plate thickness changes, the outer diameter of the printing cylinder including the printing plate changes, and the peripheral speed of the printing plate changes, that is, the conveyance speed of the corrugated cardboard sheet and the printing plate. There will be a difference in plate speed. If the sheet conveyance speed is different from the printing plate peripheral speed, a printing error occurs. In addition, there is a difference between the peripheral speed of the ink roll and the peripheral speed of the printing plate, and appropriate ink transfer to the printing plate cannot be performed.
[0013]
Therefore, in order to solve such a problem, conventionally, the outer diameter of the printing cylinder including the printing plate has been set to be constant by a technique as shown in FIG.
Here, FIGS. 6A and 6B are views showing a state in which the printing plate is attached to the printing cylinder, and FIG. ₀ The state where the stamp plate 12 is attached is shown. Diameter D _P The printing plate 11 is directly mounted on the printing cylinder 11 and the outer diameter of the printing plate 12 is a standard outer diameter D. ₀ It has become. Reference numeral 12a denotes a mount for attaching the stamp 12 to the printing cylinder 11, and the thickness of the stamp 12 includes the mount 12a.
[0014]
FIG. 6B is a diagram showing a conventional attachment state or attachment method of the printing plate 12 to the printing cylinder when a printing plate thinner than the standard is used. Diameter D _P A printing plate thickness H different from the standard thickness on the printing cylinder 11 ₁ If the stamp plate 12 is directly attached, the outer diameter of the stamp plate 12 is the standard outer diameter D. ₀ It will not be.
Therefore, a standard printing plate outer diameter D is obtained by attaching the printing plate 12 with the backing material 17 having a thickness of day B between the printing cylinder 11 and the printing plate 12. ₀ Is secured.
[0015]
However, every time the printing plate 12 is attached to the printing cylinder 11, sandwiching the backing material 17 is a laborious operation, and there is a problem that the productivity of the box making machine is remarkably reduced.
The present invention was devised in view of such problems, and an object of the present invention is to provide a corrugated board box making machine that can easily use printing plates having different thicknesses.
[0016]
[Means for Solving the Problems]
For this reason, the corrugated board box making machine according to the first aspect of the present invention is the corrugated board box making machine provided with a printing unit for attaching printing plates of different thicknesses to a printing cylinder and printing on the corrugated board sheet. A conveyance means for conveying the corrugated cardboard sheet in the printing section, and a control means capable of independently controlling the operation of the conveyance means and the operation of the printing section, and the control means includes the printing plate including the printing plate. The present invention is characterized in that the conveying speed of the conveying means is corrected in accordance with the outer diameter of the cylinder.
[0017]
According to a second aspect of the present invention, there is provided the corrugated board box making machine according to the first aspect of the invention, wherein the control means is configured such that the conveying speed of the corrugated board sheet coincides with the peripheral speed of the printing cylinder including the printing plate. As described above, the rotational speed of the drive source of the transport means is corrected.
The corrugated board box making machine according to claim 3 of the present invention is the corrugated board sheet making machine according to claim 2, wherein the control means includes a printing plate having a printing plate of a standard thickness. Standard outer diameter D ₀ And an outer diameter D of the printing cylinder including the printing plate when a printing plate having a thickness different from the standard thickness is attached. ₁ And the standard outer diameter D ₀ Based on the peripheral speed of the printing cylinder and the rotational speed N of the drive source at which the cardboard sheet conveyance speed coincides, the corrected rotational speed of the drive source is expressed as N × (D ₁ / D ₀ ).
[0018]
A corrugated board box making machine according to a fourth aspect of the present invention is the corrugated board sheet making machine according to any one of the first to third aspects, wherein an ink supply roll for supplying ink to the printing cylinder is provided, and the ink supply The operation of the roll and the operation of the printing unit are configured to be independently controllable, and the control unit corrects the rotation speed of the ink supply roll in accordance with the outer diameter of the printing cylinder including the printing plate. It is configured as described above.
[0019]
The corrugated board box making machine of the present invention according to claim 5 is a corrugated board box making machine provided with a printing section for attaching printing plates of different thicknesses to a printing cylinder and printing on the corrugated board sheet. An ink supply roll for supplying ink to the printer, and a control means capable of independently controlling the operation of the ink supply roll and the operation of the printing section, and the control means includes the printing cylinder including the printing plate. The rotation speed of the ink supply roll is corrected according to the outer diameter of the ink supply roll.
[0020]
A corrugated board box making machine according to a sixth aspect of the present invention is the corrugated cardboard sheet making machine according to any one of the first to fourth aspects, wherein the corrugated board sheet is sandwiched between the corrugated sheet sheets provided upstream of the conveying means. A feed roll that is sent to the conveying means; and a processing roll that is provided on the downstream side of the conveying means and that processes the corrugated cardboard sheet conveyed by the conveying means. The feed roll and the most upstream side of the printing unit The distance between the printing cylinder and the distance between the printing cylinder on the most downstream side of the printing section and the processing roll is set to be larger than the maximum length of the corrugated cardboard sheet to be passed. .
[0021]
Further, the corrugated board box making machine of the present invention according to claim 7 is characterized in that, in the above claim 6, the control means includes a distance from the feed roll to the printing cylinder, and the feed roll and the conveying means. Based on the speed difference and the length of the corrugated cardboard sheet to be passed, a processing deviation amount in the printing unit is calculated in advance, and the phase of the printing cylinder is corrected by the calculated deviation amount.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a corrugated board box making machine according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration, and FIG. 2 is a diagram for explaining a mounting dimension relationship of a printing plate. FIG. 3 is a diagram for explaining the indexing error and shows the dimensional relationship of the main part, and FIG. 4 is a diagram for explaining the indexing error and explaining the magnitude of the error. is there.
[0023]
In FIG. 1, a paper feed unit 30 is basically configured in the same manner as a conventional one. That is, the cardboard sheet 3 is kicked out by a kicker 5 that reciprocates by the crank lever mechanism 4, and the kicked sheet 3 is fed out by a feed roll 6.
However, in the present embodiment, the drive system of the paper feeding unit 30 is configured to be separated from the printing unit 40 and is driven independently. In this respect, the conventional system (see FIG. 5) is different. Is different. That is, as shown in the drawing, the paper feeding unit 30 is different from the printing unit 40 in the drive motor M. _F Therefore, it can be driven independently. Although not shown in detail, the feed roll 6 is connected to the crank lever mechanism 4 by a gear train or the like, and the motor M _F It comes to be driven by.
[0024]
The printing unit 40 is provided with a printing cylinder 41, an ink supply roll 42, and an ink chamber 14 as in the prior art, but each of the printing cylinder 41 and the ink supply roll 42 is a single motor M. _P And M _A This is different from the conventional method.
The printing unit 40 includes four printing units, and each printing unit has the same configuration. Therefore, in FIG. 1, only the most upstream printing unit is denoted by a reference numeral, and the downstream printing unit is omitted. In the drawing, the motors that drive the printing cylinders 41 are respectively M from the upstream side. _P1 , M _P2 , M _P3 , M _P4 M is attached if it is not distinguished. _P Is used. Similarly, each of the motors that drive the ink supply roll 42 is M. _A1 , M _A2 , M _A3 , M _A4 M is attached if it is not distinguished. _A Is used.
[0025]
Further, it differs from the conventional one in that a belt-type transport conveyor 50 is provided as a transport means for the corrugated cardboard sheet 3 in the printing unit 40 instead of the conventional feed roll 16.
That is, as illustrated, an entrance guide roll 51 is provided at the entrance of the printing unit 40, and an exit guide roll 52 is provided at the exit. A receiving roll 53 is provided below each printing cylinder 41. Furthermore, the drive motor M _T A driving roll 54 and an appropriate number of idler rolls 55 are provided, and an endless conveying belt 56 is hung on these rolls. An inlet press roll 58 is provided above the inlet guide roll 51, and an outlet press roll 59 is provided above the outlet guide roll 52.
[0026]
In addition, the drive motor M of this conveyance conveyor 50 _T Are controlled independently of the printing unit 40. Further, the positions of the rolls 51, 52, 53 are set so that the upper running surface of the conveyor belt 56 runs parallel to the lower surface of each printing cylinder 41.
Suction boxes 57 are provided between the inlet roll 51 and the receiving roll 53, between the adjacent receiving roll 53, and between the receiving roll 53 and the outlet roll 52, respectively. The suction box 57 is connected to a vacuum source (not shown) so that the inside is held at a negative pressure.
[0027]
The slotter cleaner 70 is provided with ruled line rolls 21, 24, a slotter head 22 and a slotter knife 23, as in the prior art, but in this embodiment, the slotter cleaner 70 is provided with a drive motor M. _S Is different from the printing unit 40 and the conveyer 50 only in that it is driven independently.
The control system of the corrugated board box making machine is provided with a control means comprising a production control device 80 and a control panel 81 as shown in the figure. Of these, the production control device 80 stores data necessary for producing a cardboard box, sheet size, printing position, stamp thickness, slot groove depth, and the like. Is output. In addition, the control panel 81 determines each motor M based on data from the production control device 80. _F , M _P , M _A , M _T , M _S This controls the driving state such as the rotation speed of the printer, and thereby controls the positions of printing and slot grooves.
[0028]
In the present invention, the crank lever mechanism 4 of the paper feeding unit 30, the printing cylinder 41, and the slotter head 22 of the slotter creaser unit 70 have a one-to-one rotation ratio, that is, one rotation every time one cardboard sheet 3 is fed. Each drive motor M _F , M _P , M _S The driving state is controlled.
Further, in the printing unit 40, the corrugated cardboard sheet 3 is adsorbed by suction (negative pressure) by the transport conveyor 50 and transported. Therefore, the conveyance speed of the cardboard sheet 3 is the drive motor M of the conveyance conveyor 50. _T Determined by.
[0029]
Therefore, in the present invention, even when the printing plates 12 having different thicknesses are attached to the printing cylinder 41, the drive motor for the transport conveyor 50 is provided so that the printing plates 12 can be mounted without using a conventional backing material. M _T Is controlled in accordance with the type (thickness) of the printing plate 12.
Specifically, FIG. 2A shows a standard thickness H. ₀ 2 shows a state in which the printing plate 12 is attached to the printing cylinder 41, and FIG. ₁ A state where the printing plate 12 is attached to the printing cylinder 41 is shown. At this time, of course, the standard thickness H ₀ Outside diameter (standard outside diameter) D ₀ And thickness H ₁ Outside diameter D when the stamp plate 12 is attached ₁ And the value will be different. Since the angular velocity of the printing cylinder 41 is the same when the outer diameter is different, the peripheral speed [= angular velocity × (outer diameter / 2)] of the printing plate 12 is different.
[0030]
Therefore, in the present invention, the motor M that drives the conveyor 50. _T Motor M so that the rotation speed is the same as the peripheral speed of the printing plate outer diameter. _T The driving state is controlled. That is, when the standard stamp is used (in other words, the standard outer diameter D ₀ Drive motor M _T Rotational speed (standard speed) N for D ₁ / D ₀ Only motor M _T Thus, the conveyor speed 50 is corrected and the conveyor 50 is driven.
[0031]
That is, in the control panel 81, the thickness data H of the printing plate 12 obtained from the production control device 80 is displayed. ₁ The outer diameter D of the printing cylinder 41 including the thickness of the printing plate 12 based on ₁ And the drive motor M of the conveyor 50 _T Standard speed N to D ₁ / D ₀ Drive motor M _T Calculate the speed of. The control panel 81 then drives the drive motor M so as to achieve this speed. _T Command is output.
[0032]
In this way, the driving of the printing cylinder 41 and the conveyance of the corrugated cardboard sheet 3 are made independent, and the speed of the conveying conveyor 50 is controlled based on the outer diameter of the printing cylinder 41 including the printing plate 12, thereby different thicknesses. Even if the printing plate 12 is used, the printing plate peripheral speed and the conveyance speed of the sheet 3 can always be matched, and processing of a corrugated cardboard sheet with high printing accuracy can be realized. Thereby, the trouble of sticking the conventional backing material is saved, and the productivity is improved.
[0033]
Further, a drive motor M that drives the ink roll 42. _A Also, the rotational speed is controlled to match the peripheral speed of the stamp 12 by the same method as described above. As a result, the ink can be appropriately transferred to the printing cylinder 41.
By the way, in this embodiment, the distance L between the feed roll 6 of the paper feeding unit 30 and the first color printing cylinder. _F And the distance L between the last printing cylinder (fourth color printing cylinder in this embodiment) and the first ruled line roll (processing roll) 21. _S Is the maximum length K of the sheet S that passes through this box making machine. _MAX It is set to be larger.
[0034]
This is due to the following reason. That is, in the present invention, when the thickness of the printing plate 12 is different from the standard, the peripheral speed of the printing cylinder 41 and the speed of the transport conveyor 50 are different from the peripheral speed of the feed roll 6 and the ruled line roll 21. The sheet conveying force of the feed roll 6 must be large enough to pull out the sheet 3 kicked by the kicker 5 from the lowest position of the sheet group loaded on the table 2. Since the lowermost sheet 3 is loaded with the total weight of the sheets stacked thereon, a considerable force is required to overcome the frictional force and pull out the sheet 3, and the pulling force by the feed roll 6 Is larger than the sheet conveying force of the conveying conveyor 50 by suction.
[0035]
Further, since the ruled line head 21 is used to process a ruled line for bending on the cardboard sheet 3, the cardboard sheet 3 is sandwiched with a large force. Therefore, the sheet conveying force of the ruled line roll 21 is necessarily larger than the conveying force of the conveyor 50.
In such a situation, the distance L described above is assumed. _F , L _S Is smaller than the length of the sheet 3, the sheet 3 may be sandwiched between both the printing cylinder 41 and the feed roll 6 or may be sandwiched between both the printing cylinder 41 and the ruled line roll 21 at the same time. appear. At this time, the sheet 3 is conveyed at the speed of the feed roll 6 or the ruled line roll 21 having a strong conveying force, and slippage occurs between the sheet 3 and the printing plate 12, resulting in printing failure.
[0036]
Therefore, in order to avoid such a situation, the printing cylinder 41, the feed roll 6, and the distance L _F , And the distance L between the printing cylinder 41 and the ruled line roll 21 _S Maximum length K of sheet 3 that can be considered _MAX It is set larger.
By setting in this way, it is possible to avoid a situation in which the sheet 3 is simultaneously sandwiched between both the printing cylinder 41 and the feed roll 6 or is simultaneously sandwiched between both the printing cylinder 41 and the ruled line roll 21. Printing defects can be avoided. Thereby, the quality of the cardboard sheet 3 can be improved.
[0037]
By the way, as in the present embodiment, the driving of the printing cylinder 41 and the conveyance of the cardboard sheet 3 are made independent, and the speed of the conveying conveyor 50 is controlled based on the outer diameter of the printing cylinder 41 including the printing plate 12. In the case of the configuration, a processing shift (processing error) occurs in processing by the printing cylinder 41, the ruled line roll 21, or the like.
[0038]
This will be described below with reference to FIG. 3 and FIG. 4. FIG. 3 shows the main part of the component of the present invention shown in FIG. 1, and is mainly a diagram for showing the dimensional relationship. In FIG. 3, for simplification of explanation, reference numerals {circle around (1)} to {circle around (5)} are given to the printing cylinder 41 for four colors and the first ruled line roll 21 (hereinafter simply referred to as “cylinder”) in order from the feed roll 6. It is attached.
[0039]
Also, the distance from the feed roll 6 to each cylinder (1) to (5) is set to L ₁ ~ L ₅ The distance between the tip of the cardboard sheet 3 at the moment of leaving the feed roll 6 and each cylinder (1) to (5) is S ₁ ~ S ₅ Represented by In this case, S _i And L _i As is clear from FIG. 3, there is a relationship as shown in the following formula (1).
S _i = L _i -K (1)
(However, i = 1, 2, 3, 4, 5)
In addition, on each cylinder (1) to (5), the origin O ₁ ~ O ₅ Is stipulated. The origin O is when the machine is operated with the standard thickness printing plate (that is, when the speed of the conveyor 50 is equal to the peripheral speed of the standard thickness printing plate 12), as shown in FIG. It is a point that matches the tip. That is, if ink is attached to the origin O, the origin O is printed on the leading edge of the sheet 3.
[0040]
However, when the thickness of the printing plate changes (here, it is assumed that a thin printing plate is used), the speed of the conveyer 50 decreases in accordance with the peripheral speed of the thin printing plate. Since the cylinder itself rotates at a constant angular speed regardless of the printing plate thickness, the cylinder origin O on the corrugated board sheet fed at a slow conveyor speed ₁ Is printed, O in FIG. ₁ ′ Position, ie O ₁ To δ ₁ Is printed at a position shifted by a distance. That is, since the conveyance speed of the corrugated cardboard sheet 3 is slow, the cylinder moves forward when viewed relatively, and thus the above-described deviation occurs.
[0041]
This deviation (indexing error) δ _i Considering the size of (i = 1, 2, 3, 4, 5), while the corrugated cardboard sheet 3 is sandwiched between the feed rolls 6, the sheet 3 is conveyed at the peripheral speed of the feed roll 6 as described above. Further, since the peripheral speed of the feed roll 6 is always the same as the peripheral speed at the time of the standard printing plate regardless of the thickness of the printing plate 12, no deviation occurs. The deviation occurs during the time when the corrugated board sheet 3 leaves the feed roll 6 and is conveyed to each cylinder by the transport conveyor 50. Then, taking into account the difference in transport conveyor speed during this period, the amount of deviation δ _i Can be represented by the following formula (2).
δ _i = (1-D ₁ / D ₀ ) × S _i (2)
In formula (2), (1-D ₁ / D ₀ ) Corresponds to the speed difference.
[0042]
Therefore, in the present invention, the control panel 81 uses the expression (1) and the expression (2) based on the sheet length data, the stamp thickness data, the dimensional relation data of the cylinder and the like obtained from the production control device 80. δ _i Is calculated. In the control panel 81, the calculated δ _i The drive motor M of each cylinder is adjusted so that the rotation phase of each cylinder is adjusted according to the above (this is called correction of the index amount). _P1 , M _P2 , M _P3 , M _P4 , M _S A control signal is output with respect to.
[0043]
By performing such control, it is possible to manufacture a high-quality corrugated cardboard sheet without processing errors.
Since the corrugated board box making machine according to one embodiment of the present invention is configured as described above, its operation will be described as follows. First, the kicker 5 reciprocally moved by the crank lever mechanism 4 kicks out the lowest sheet 3 among the cardboard sheets stacked on the table 2 of the paper feeding unit 30 and sends it out to the conveyor 50 by the feed roll 6. It is.
[0044]
In the transport conveyor 50, the sheet 3 is attracted to the transport belt 56 by negative pressure and transported to the printing unit 40. At this time, the driving motor M of the conveyor 50 _T Is controlled by the control panel 81 so that the peripheral speed of the printing cylinder 40 including the printing plate 12 and the conveyance speed of the sheet 3 coincide with each other.
That is, in the control panel 81, the outer diameter D of the printing cylinder 41 including the printing plate 12 based on information from the production control device 80. ₁ And the drive motor M of the conveyor 50 _T Standard speed N to D ₁ / D ₀ Drive motor M _T Calculate the speed of. In the control panel 81, the drive motor M is adjusted so as to achieve this speed. _T Feedback control.
[0045]
In this way, the printing cylinder 41 and the conveyance of the corrugated cardboard sheet 3 are driven independently, and the printing cylinder 41 is corrected by correcting the speed of the conveyance conveyor 50 based on the outer diameter of the printing cylinder 41 including the printing plate 12. By making it coincide with the peripheral speed, it is possible to use printing plates of various thicknesses without using a backing material, and it is possible to easily increase the printing accuracy of the cardboard sheet. Further, since the work of attaching the backing material is not required, productivity can be improved and cost can be reduced.
[0046]
The drive motor M is the same as described above. _A By correcting the speed of the ink roll 42 so that the peripheral speed of the ink roll 42 matches the peripheral speed of the printing cylinder 41, the ink can be reliably and appropriately transferred from the ink roll 42 to the printing cylinder 41, and the printing accuracy is improved. To do.
Next, in the control panel 81, based on the information from the production control device 80, the processing deviation δ caused by the speed control of the transport conveyor 50 (that is, caused by the speed difference between the feed roll 6 and the transport conveyor 50). _i Is also calculated. This processing deviation δ _i Is calculated by substituting each data into the above formulas (1) and (2). Then calculated δ _i The rotational phase amount (indexing amount) of each cylinder is calculated so that is canceled out, and the cylinder phase is adjusted by this indexing amount.
[0047]
And by performing such control, a processing error can be eliminated and a high quality cardboard sheet can be manufactured.
Further, the distance L between the feed roll 6 of the paper feeding unit 30 and the first color printing cylinder. _F And the distance L between the last printing cylinder and the first ruled line roll 21 _S However, in all cases, the maximum length K of the sheet S that passes through the box-making machine _MAX Is set so that the sheet 3 is sandwiched between both the printing cylinder 41 and the feed roll 6 or the printing cylinder 41 and the ruled line roll 21 at the same time. Printing failure is avoided.
[0048]
Next, a modified example of the present embodiment will be described. In this modified example, although not shown, the sheet feeding unit 30, the printing cylinder 41, and the slotter cleaner 70 (hereinafter collectively referred to as “cylinder unit”). Are connected using a gear train or a line shaft, and are driven by a single drive source, so that the operation of the cylinder system unit is performed synchronously. Yes.
[0049]
In the above-described embodiment, each cylinder system unit is provided with an independent drive motor M. _F , M _P1 , M _P2 , M _P3 , M _P4 , M _S However, as described above, these need only be driven in a one-to-one relationship, and it is not always necessary to use an independent motor.
However, as a box making machine for corrugated cardboard sheets, there are various factors that cause sheet feeding errors in addition to the processing deviation caused by the outer diameter of the printing plate as in the present application. The method is easier to handle and is preferable. For this reason, in the above-described embodiment, the single drive system has been exemplified as the best mode of the cosmetic printing box making machine that requires high accuracy. However, if only focusing on the problem of the thickness of the printing plate, the problem of the present invention can be solved by making at least the drive system of the cylinder system unit, the sheet transport system, and the drive system of the ink roll independent. .
[0050]
【The invention's effect】
As described above in detail, according to the corrugated board box making machine of the present invention, printing plates of various thicknesses can be used without using a backing material, and the printing accuracy of the corrugated board sheet can be easily increased. it can. Moreover, since the operation | work which sticks a backing material becomes unnecessary, productivity can be improved and cost reduction can be aimed at (claims 1-3).
[0051]
Further, by correcting the rotational speed of the drive source of the ink supply roll in accordance with the outer diameter of the printing cylinder including the printing plate, the ink can be appropriately transferred to the printing cylinder, and the printing accuracy is improved. , 5).
In addition, it is possible to avoid a situation in which a corrugated cardboard sheet is sandwiched between both the feed roll and the printing cylinder at the same time, or is sandwiched between both the printing cylinder and the processing roll. A high cardboard sheet can be produced (claim 6).
[0052]
Further, it is possible to eliminate a processing error caused by the speed difference between the feed roll and the conveying means, and there is an advantage that a high-quality corrugated cardboard sheet can be produced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall configuration of a corrugated board box making machine according to an embodiment of the present invention.
FIG. 2 is a view for explaining a relation of mounting dimensions of a printing plate of a corrugated board box making machine according to an embodiment of the present invention.
FIG. 3 is a diagram for explaining an indexing error in the corrugated board box making machine according to the embodiment of the present invention, and is a diagram showing a dimensional relationship of main parts.
FIG. 4 is a diagram for explaining an indexing error in a corrugated board box making machine according to an embodiment of the present invention, and is a diagram for explaining the magnitude of the error.
FIG. 5 is a schematic diagram showing an example of a conventional corrugated board sheet box making machine.
FIGS. 6A and 6B are diagrams for explaining the problems of the prior art.
[Explanation of symbols]
1 Paper feeder
2 tables
3 Cardboard sheet
4 Crank lever mechanism
5 Kikka
6 Feed roll
10 Printing department
11 Printing cylinder
12 Stamp
12a Mount
13 Ink supply roll or ink roll
14 Ink chamber
15 Receiving roll
16 Feeding roll
17 Backing material
20 Slotter creaser
21 First ruled line roll (processing roll)
22 Slotter head
23 Slotter knife
24 Second ruled line roll
30 Paper feeder
40 Printing department
41 Printing cylinder
42 Ink supply roll or ink roll
50 Conveyor (conveying means)
51 Entrance guide roll
52 Exit guide roll
53 Receiving roll
54 Drive roll
55 idler roll
56 Conveyor belt
57 Suction box
58 Entrance presser roll
59 Exit presser roll
70 Slotter Creiser
80 Production control device (control means)
81 Control panel (control means)
M _F Feeder drive motor
M _P Printing cylinder drive motor
M _A Ink roll drive motor
M _T Conveyor drive motor
M _S Slotter creaser drive motor
D _P Printing cylinder outer diameter
H ₀ Standard printing plate thickness
H ₁ Non-standard stamp thickness
D ₀ Outer diameter of the printing plate with the standard printing plate thickness
D ₁ Outer diameter of the printing plate with a printing plate thickness other than the standard
B Backing material thickness
L _F Distance between feed roll and first color printing cylinder
L _S Distance between the last printing cylinder and the first ruled line roll
K Length of sheet to pass
K _MAX Maximum length of sheet to pass
L Distance from feed roll to cylinder
S Distance that the corrugated sheet moves from the feed roll to the cylinder
δ Deviation due to speed difference of conveyor

Claims (7)

In a corrugated board box making machine with a printing section that attaches printing plates of different thicknesses to a printing cylinder and prints on corrugated board sheets,
Conveying means for conveying the cardboard sheet in the printing unit;
A control means capable of independently controlling the operation of the conveying means and the operation of the printing unit;
The corrugated board box making machine, wherein the control means is configured to correct the conveyance speed of the conveyance means in accordance with the outer diameter of the printing cylinder including the printing plate. The control means corrects the rotational speed of the drive source of the conveying means so that the conveying speed of the cardboard sheet coincides with the peripheral speed of the printing cylinder including the printing plate. Box making machine for cardboard sheets. The control means includes
A standard outer diameter D _{0 of the} printing cylinder containing the printing plate when a printing plate of standard thickness is attached;
The outer diameter D ₁ of the said printing cylinder including indicia plate when fitted with a printing plate of different thicknesses the thickness of the standard,
Based on the peripheral speed of the printing cylinder having the standard outer diameter D ₀ and the rotational speed N of the driving source at which the conveying speed of the corrugated cardboard sheet coincides,
3. The corrugated board box making machine according to claim 2, wherein the rotational speed after correction of the drive source is calculated by N × (D ₁ / D ₀ ). An ink supply roll for supplying ink to the printing cylinder is provided, and the operation of the ink supply roll and the operation of the printing unit are configured to be independently controllable,
The control means is configured to correct the rotation speed of the ink supply roll in accordance with the outer diameter of the printing cylinder including the printing plate. The box making machine for corrugated cardboard sheets described in the paragraph In a corrugated board box making machine with a printing section that attaches printing plates of different thicknesses to a printing cylinder and prints on corrugated board sheets,
An ink supply roll for supplying ink to the printing cylinder;
A control means capable of independently controlling the operation of the ink supply roll and the operation of the printing unit;
The corrugated board box making machine, wherein the control means is configured to correct the rotational speed of the ink supply roll in accordance with the outer diameter of the printing cylinder including the printing plate. A feed roll provided on the upstream side of the conveying means, and sending the cardboard sheet to the conveying means,
A processing roll that is provided downstream of the conveying means and processes the corrugated cardboard sheet conveyed by the conveying means;
The distance between the feed roll and the printing cylinder on the most upstream side of the printing unit, and the distance between the printing cylinder on the most downstream side of the printing unit and the processing roll are both greater than the maximum length of the corrugated cardboard sheet to be passed. The corrugated cardboard box making machine according to any one of claims 1 to 4, wherein the corrugated cardboard sheet making machine is also set large. The control means
Based on the distance from the feed roll to the printing cylinder, the speed difference between the feed roll and the conveying means, and the length of the corrugated cardboard sheet to be passed, the processing deviation amount in the printing unit is calculated in advance. The corrugated board box making machine according to claim 6, wherein the phase of the printing cylinder is corrected by the calculated deviation amount.

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