JP2011207006A - Carton making machine for corrugated cardboard sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carton making machine for a corrugated cardboard sheet without the occurrence of slipping when the corrugated cardboard sheet fed from feed rolls transfers onto a carriage conveyor.SOLUTION: The carton making machine 1 for the corrugated cardboard sheet includes: a printing section printing on the corrugated cardboard sheet with use of print cylinders 18 where printing plates with different thicknesses can be attached; the carriage conveyors 28 carrying the corrugated cardboard sheet; the feed rolls 4; a sheet feeder 2; and a controller 10. The controller controls the speed of the carriage conveyor so that it matches the circumferential speed of the outer diameter of the print cylinders, seeks a phase displacement amount of the print in advance to correct it, and controls the speed of the feed rolls so that it matches the feed speed of the sheet by the sheet feeder at the time when the leading end of the corrugated cardboard sheet reaches the feed rolls, and also controls the speed of the feed rolls so that it matches the speed of the carriage conveyor when the leading end of the corrugated cardboard sheet passes through the feed rolls and reaches the reference position corresponding to the length of the corrugated cardboard sheet with a minimum dimension.

Description

  The present invention relates to a corrugated board box making machine, and more particularly, to a corrugated board box making machine provided with a printing unit for printing on a corrugated board sheet.

2. Description of the Related Art Conventionally, a corrugated sheet box making machine that performs processing such as printing, grooving, and crease forming on a corrugated cardboard sheet is known.
The corrugated board box making machine prints on the corrugated sheet supplied by the feed roll and the paper feed device (kicker type, rotary type) that feeds the lowermost corrugated cardboard sheets one by one to the feed roll. And a slotter creaser for performing grooving and creasing of corrugated cardboard sheets.

  The printing section of the corrugated board box making machine has a printing cylinder with a printing plate for printing the corrugated board sheet, an ink supply roll for transferring ink to the printing plate, and anilox that supplies ink to the ink supply roll. A roll, a receiving roll provided below the printing cylinder, and a conveyance means (such as a conveyance conveyor) for conveying the cardboard sheet are provided. In recent years, a printing plate attached to a printing cylinder has been used with a thin (about 3 mm) printing plate in addition to a relatively thick standard printing plate (about 7 mm).

These printing plates with different thicknesses are used in a single box making machine, and when printing plates with different thicknesses are attached to the printing cylinder, the diameter of the printing cylinder body is constant. Changes, the outer diameter of the printing cylinder including the printing plate changes, and the peripheral speed of the outer diameter of the printing cylinder changes. As a result, a speed difference is generated between the peripheral speed of the outer diameter of the printing cylinder and the conveying speed of the corrugated cardboard sheet by the conveying means, thereby causing a printing error.
Patent document 1 and patent document 2 describe a corrugated sheet box making machine that prevents the occurrence of printing errors caused by using printing plates having different thicknesses.

  In Patent Document 1, when a printing plate having a thickness different from that of a standard printing plate is used, the peripheral speed of the outer diameter of the printing cylinder and the conveyance speed of the conveyance conveyor are prevented so that the above-described printing error does not occur. And the amount of printing phase shift generated by changing the transport speed of the transport conveyor is obtained (the method for calculating the amount of printing phase shift is described in paragraphs [0037] to [0047] of Patent Document 1. And a box making machine in which the angle of the printing cylinder is corrected before starting printing based on the printing phase shift amount. In the box making machine of Patent Document 1, the speed of the feed roll is constant, and the amount of printing phase shift is the distance from the feed roll to the printing cylinder, the speed difference between the feed roll and the conveyor, and the cardboard sheet length. It is calculated based on Sato.

  In Patent Document 2, as in Patent Document 1, when printing plates having different thicknesses are used, the peripheral speed of the outer diameter of the printing cylinder and the conveyance belt for conveying the cardboard sheet are prevented so that the above-described printing error does not occur. A box making machine that matches the speed is described. Furthermore, in the box making machine of Patent Document 2, when the cardboard sheet slips inadvertently on the conveyance belt, the position of the cardboard sheet is detected by a sensor so that the cardboard sheet is positioned correctly with respect to the position of the printing plate. In addition, the speed of the conveyor belt is corrected in the non-printing rotation angle region of the printing cylinder.

JP 2005-14369 A US Pat. No. 5,385,091

However, in the corrugated board box making machine disclosed in Patent Document 1, the speed of the conveyor conveyer driven to coincide with the peripheral speed of the printing cylinder and the speed of the corrugated board sheet fed from the feed roll (constant speed). Due to the difference in speed, slippage may occur when the corrugated board sheet leaves the feed roll and moves onto the transport conveyor, and this slip has a problem that printing slippage occurs.
Further, in the corrugated board box making machine of Patent Document 1, since the printing phase shift amount is obtained based on the cardboard sheet length, it is necessary to correct the printing phase shift amount every time the cardboard sheet length is different. There is a complicated control.

  Further, in the corrugated cardboard box making machine disclosed in Patent Document 2, the position of the corrugated cardboard sheet is detected by a sensor, and the speed of the conveyor belt is corrected so that the corrugated cardboard sheet is positioned correctly with respect to the position of the printing plate. Therefore, a sensor is necessary, and furthermore, the control is complicated because the speed of the conveyor belt is variable-speed controlled by the sensor output.

  Therefore, the present invention has been made to solve the problems of the prior art, and no slip occurs when the corrugated cardboard sheet fed from the feed roll moves onto the conveying means, and the printing phase shift It is an object of the present invention to provide a corrugated cardboard box making machine that can easily perform correction by quantity.

In order to achieve the above object, the present invention is a corrugated board box making machine having a printing section for printing on a corrugated cardboard sheet, and the corrugated cardboard sheet is formed by a printing cylinder to which a plurality of printing plates having different thicknesses can be attached. A printing section for printing, a conveyance means for conveying the cardboard sheet in the printing section, a feed roll provided upstream of the conveyance means, and supplying the cardboard sheets one by one to the conveyance means, and more than the feed roll A sheet feeding device that is provided on the upstream side and feeds the lowermost one of the stacked cardboard sheets to the feed roll one by one, operation of the printing cylinder, operation of the conveying means, operation of the feed roll, A control unit that controls the operation, and the control unit firstly adjusts the speed of the conveying means to coincide with the peripheral speed of the outer diameter of the printing cylinder including the printing plate. Secondly, the distance from the center position of the feed roll to the center position of the printing cylinder, the minimum length of the corrugated cardboard sheet, and when using the standard printing plate, use a printing plate having a thickness different from that of the standard printing plate. Printing phase shift in the printing section based on the difference in speed of the conveying means between the case and the amount of deviation that occurs while the leading edge of the cardboard sheet moves from the feed roll to the reference position corresponding to the length of the corrugated sheet of the smallest dimension. The amount of the printing cylinder is obtained in advance, and the phase of the printing cylinder is corrected by the amount of printing phase deviation before the start of printing. Third, the rotation speed of the feed roll is determined by the paper feeder when the leading edge of the cardboard sheet reaches the feed roll. Corresponding to the sheet supply speed, the leading edge of the corrugated board sheet passes through the feed roll and corresponds to the length of the smallest corrugated sheet. Is characterized in that control to be consistent with the speed of the conveying means when reaching the that reference position.
According to the present invention configured as described above, the rotation speed of the feed roll is controlled by the control unit so as to coincide with the sheet supply speed of the sheet feeding device when the leading end of the corrugated cardboard sheet reaches the feed roll. In addition, when the leading end of the corrugated cardboard sheet passes through the feed roll and reaches a reference position corresponding to the length of the corrugated cardboard sheet having the smallest dimension, the corrugated cardboard sheet is controlled so as to coincide with the speed of the conveying means. Therefore, regardless of the length of the corrugated sheet, the speed of the corrugated sheet coincides with the speed of the conveying means at the moment when the corrugated sheet separates from the feed roll. The slip (position shift) of the corrugated cardboard sheet caused by the difference in speed can be surely prevented, Printing accuracy is improved.
Furthermore, the thickness of the printing plate attached to the printing cylinder changes and the amount of printing phase shift caused by matching the conveyance speed to the peripheral speed of the outer diameter of the printing cylinder is calculated from the center position of the feed roll to the center position of the printing cylinder. Distance, minimum sized corrugated sheet length, difference in speed of transport means when using standard printing plate and printing plate with thickness different from standard printing plate, and leading edge of corrugated cardboard sheet Since it can be calculated based on the amount of deviation that occurs while moving to the reference position corresponding to the length of the corrugated cardboard sheet, it is not necessary to correct the printing phase deviation amount every time the cardboard sheet length is different, and the printing cylinder The correction of the printing phase shift amount is simplified.

In the present invention, preferably, a plurality of printing cylinders are provided, and the control unit, for each printing cylinder, the distance from the center position of the feed roll to the center position of each printing cylinder, the corrugated sheet length of the minimum dimension, And based on the speed of the conveying means, the printing phase shift amount in each printing cylinder is obtained in advance, and the phase of each printing cylinder is corrected by this printing phase shift amount before starting printing.
In the present invention configured as described above, even when a plurality of printing cylinders are provided, the correction of the printing phase shift amount of each printing cylinder is automatically performed for each printing cylinder before starting printing. Or it can carry out easily by manual operation.

In the present invention, preferably, the control unit attaches a printing plate having a thickness smaller than that of the standard printing plate to the printing cylinder and the corrugated sheet has a minimum size, and the rotation speed of the feed roll is set to the feed roll at the leading end of the corrugated sheet. At the time when the sheet arrives, the sheet feeding speed is matched with the sheet feeding speed, and the sheet is fed by the sheet feeding device from the time when the leading edge of the cardboard sheet reaches the feed roll until the trailing edge of the cardboard sheet leaves the feed roll. Control is performed to decelerate from the speed to a speed that matches the speed of the conveying means.
In the present invention configured as described above, when a printing plate having a thickness smaller than that of the standard printing plate is used and the corrugated cardboard sheet has the minimum size, the speed of the corrugated sheet having the minimum size away from the feed roll is set to the speed of the thin printing plate. Since the speed of the transporting means can be matched with the peripheral speed of the outer diameter of the printing cylinder, it is possible to reliably prevent the cardboard sheet from slipping when the cardboard sheet having the smallest dimension leaves the feed roll. .

In the present invention, preferably, the control unit attaches the printing plate having a thickness smaller than that of the standard printing plate to the printing cylinder and the corrugated sheet has the maximum size, and the rotation speed of the feed roll is set to the feed roll at the leading end of the corrugated sheet. At the time of arrival, the sheet feeding device is made to coincide with the sheet supply speed by the sheet feeding device, and until the leading end of the corrugated cardboard sheet passes through the feed roll and reaches the reference position corresponding to the length of the corrugated sheet having the smallest dimension. The sheet is fed from the sheet feeding speed to a speed that matches the speed of the conveying means, and thereafter, the rotational speed at the time when the reference position is reached is controlled until the rear end of the corrugated board sheet leaves the feed roll.
In the present invention configured as described above, when a printing plate having a thickness smaller than that of the standard printing plate is used and the cardboard sheet has the maximum size, the speed of the maximum size cardboard sheet away from the feed roll is increased. The speed of the transporting means, which matches the peripheral speed of the outer diameter of the printing cylinder, coincides with the reference position, and then the feed roll at the time when the reference position is reached until the rear end of the corrugated cardboard sheet is separated from the feed roll. Since the rotational speed is maintained, even when the corrugated sheet has the maximum size, the slip of the corrugated cardboard sheet can be surely prevented at the moment when it leaves the feed roll.

In the present invention, it is preferable that the sheet feeding device includes a kicker device that converts the rotation operation into a reciprocating operation by a crank mechanism and pushes out the cardboard sheets at the bottom of the corrugated cardboard sheets stacked by the kicker one by one. The kicker speed is controlled so as to reach the maximum speed before the leading edge of the cardboard sheet reaches the feed roll.
In the present invention configured as described above, the cardboard sheet can be effectively supplied to the feed roll by utilizing the characteristic of the kicker that converts the rotating operation into the reciprocating operation. In particular, when the kicker is decelerating from the maximum speed, the tip of the corrugated cardboard sheet is supplied to the feed roll. Therefore, when the feed roll is controlled to a variable speed as in the present invention, the feed roll speed change by the control is performed. The influence which it has on can be suppressed.

  In the present invention, it is preferable that the sheet feeding device is a rotary type in which the corrugated board sheets are fed one by one by a sheet feeding roller provided below the lowermost corrugated cardboard sheet.

  According to the box making machine for corrugated cardboard sheets according to the present invention, no slip is generated when the corrugated cardboard sheets fed from the feed rolls move on the conveying means, and correction by the printing phase shift amount can be easily performed. it can.

1 is an overall side view of a corrugated board box making machine according to an embodiment of the present invention. It is a figure which shows a part of printing cylinder with which the printing plates from which thickness differs were attached. It is a schematic block diagram which shows the principal part of the box making machine for corrugated cardboard sheets by embodiment of this invention. It is a side view which shows the kicker type paper feeder of the box making machine for corrugated board by the embodiment of the present invention. Feed rolls for supplying a corrugated cardboard sheet having a minimum size (FIG. 5 (a)) and for supplying a corrugated cardboard sheet having a maximum size (FIG. 5 (b)) in the corrugated board sheet making machine according to the embodiment of the present invention. It is a figure which shows the content of this speed control. It is a diagram which shows the relationship between the kicker position and crank gear position in the kicker type paper feeder of the corrugated board box making machine according to the embodiment of the present invention. It is a diagram which shows the relationship between the kicker speed and crank gear position of the kicker type paper feeder of the corrugated board box making machine according to the embodiment of the present invention. It is a diagram which shows the speed control content of the feed roll at the time of using the thin printing plate in the box making machine for corrugated board sheets by embodiment of this invention. It is a diagram which shows the speed control content of the feed roll at the time of using the printing plate of the standard thickness in the box making machine for corrugated board sheets by embodiment of this invention.

  Next, a corrugated board box making machine according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, the basic structure of a corrugated board box making machine according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall side view of a corrugated board box making machine according to an embodiment of the present invention, FIG. 2 is a view showing a part of a printing cylinder to which printing plates having different thicknesses are attached, and FIG. FIG. 4 is a side view showing a kicker type paper feeder of the corrugated board box making machine according to the embodiment of the present invention.

  As shown in FIG. 1, the code | symbol 1 shows the box making machine for corrugated cardboard sheets by this embodiment, and this cardboard box making machine 1 is along the conveyance direction in which the cardboard sheet S is conveyed from the upstream side to the downstream side. In addition, a kicker type paper feeder 2, a feed roll 4, a printing unit 6, and a slotter creaser unit 8 are provided, and a control device 10 for controlling these operations is further provided.

  First, the printing unit 6 will be described. The printing unit 6 is provided with three printing units 12, 14, and 16 from the upstream side. Since each printing unit has the same configuration, only the printing unit 12 on the upstream side will be described. The printing unit 12 is provided with a printing cylinder 18 to which a printing plate 20 (see FIG. 2) is attached. In the vicinity of the printing cylinder 18, an ink supply roll 22 for transferring ink to the printing plate 20 and an ink squeezing roll 24 for removing excess ink from the surface of the ink supply roll 22 are provided.

  A receiving roll 26 is provided below the printing cylinder 18, and the corrugated cardboard sheet S is printed while being sandwiched between the printing plate 20 and the receiving roll 26. Between the printing cylinders 18 of the printing units 12, 14, and 16 and between the feed rolls 4, conveying conveyors 28 including a large number of conveying rolls are arranged. In addition, a vacuum suction box 29 is provided below the transport conveyor 28, and the cardboard sheet S is transported by the transport conveyor 28 while sucking the cardboard sheet S from below.

  Further, the printing cylinder 18 is driven independently by the motor MP, and the ink supply roll 22 is driven independently by the motor MI. The conveyor 28 is also driven independently by the motor MC. Each of these driving motors MP, MI, and MC receives a control signal from the control device 10 and is controlled independently.

  Here, as shown in FIG. 2, printing plates 20 of different thicknesses can be attached to the printing cylinder 18 of the corrugated board sheet making machine 1 of the present embodiment. FIG. 2A shows a printing cylinder to which a standard printing plate having a thickness of the printing plate 20 of H0 (= 7 mm) is attached. The outer diameter (diameter) of the printing cylinder 18 to which the printing plate 20 is attached is The reference diameter is D0 (mm). FIG. 2B shows a printing cylinder to which a thin printing plate having a thickness of the printing plate 20 of H1 (= 3 mm) is attached, and the outer diameter (diameter) of the printing cylinder 18 to which the thin printing plate 20 is attached. ) Has a diameter D1 (mm).

  Next, the slotter cleaner 8 will be described. The slotter crease unit 8 includes a pre-creaser 30 and a main creaser 32 for making a crease on the printed cardboard sheet S, a slotter 34 for grooving the cardboard sheet, and the pre-creaser 30, the main creaser 32, and the slotter. And a motor MS for controlling 34 at the same speed.

  Next, the sheet feeder 2 and the feed roll 4 will be described with reference to FIGS. 1 and 3. First, a pair of feed rolls 4 are provided so as to sandwich the cardboard sheet S therebetween. The feed roll 4 is provided with a motor MF for controlling the feed roll 4 in a variable speed manner.

  The kicker-type paper feeder 2 includes a table 36 for stacking the corrugated cardboard sheets S, a front gate 38 that is fixedly disposed in contact with the leading end of the corrugated cardboard sheet S, and a back guide 40 that contacts the rear end of the corrugated cardboard sheet S. And a kicker device 42 (see FIG. 4) for extruding the lowermost corrugated cardboard sheet S to the feed roll 4. Here, the position of the back guide 40 and the kicker device 42 can be moved integrally along the conveying direction by the cardboard sheet length.

  As shown in detail in FIG. 4, the kicker device 42 of the paper feeding device 2 includes a driving motor MK, a crank mechanism 44 that converts the rotational operation of the motor MK into a reciprocating motion, and the crank mechanism. 44, a slide member 48 connected to the other end of the shaft 44, a linear guide 50 for guiding the slide member 48 in the sheet conveying direction, and a kicker 52 attached to the slide member 48 to push the cardboard sheet S toward the feed roll 4. I have.

  Here, the crank mechanism 44 has a flywheel 46 rotated by the motor MK, a support pin 54 attached to the outer peripheral side of the surface of the flywheel 46, and slides on the support pin 54 while sandwiching the support pin 54. A U-shaped sliding contact holding member 56 and a first arm member 60 and a second arm member 62 attached via a fulcrum shaft 58 on the rear end side of the sliding contact holding member 56 are provided. Here, in the crank mechanism 44, the sliding contact clamping member 56 and the first arm member 60 are set to a predetermined angle γ on the fulcrum shaft 58, and this angle γ is held.

  When the support pin 54 rotates once with the rotation of the flywheel 46, the kicker device 42 swings while the sliding contact holding member 56 slides with respect to the support pin 54 according to the rotation of the support pin 54. To do. The swing of the sliding contact clamping member 56 is transmitted to the first arm member 60 held at the angle γ, and the first arm member 60 is swung at the predetermined angle A. This swing is transmitted to the second arm member 62, and displacement (reciprocation) in the sheet conveying direction is applied to the slide member 48. Accordingly, the kicker 52 attached to the slide member 48 reciprocates once in the sheet conveyance direction, and one cardboard sheet is pushed out to the feed roll 4.

  Here, the kicker device 42 of the paper feeding device 2 is integrally assembled with the frame 66 together with the back guide 40. The frame 66 is movable on the rail 68 in the cardboard sheet conveyance direction, and the positions of the back guide 40 and kicker 52 with respect to the feed roll 4 and the front gate 38 according to the cardboard sheet length (length in the conveyance direction). Can be adjusted.

  The control device 10 stores data necessary for producing the corrugated cardboard sheet S, sheet size, printing position, printing plate thickness, and the like. Further, the control device 10 includes the above-described motors for the printing cylinder MP, the ink supply roll motor MI, the transport roll motor MC, the slotter cleaner motor MS, the feed roll motor MF, and the kicker motor MK. The driving state such as the rotation speed is controlled, and thereby the printing position and the like are controlled.

Next, the operation (operation) of the corrugated board box making machine according to this embodiment will be described.
First, when the printing plates 20 having different thicknesses are attached to the printing cylinder 18, the outer diameter of the printing cylinder 18 changes, and the peripheral speed of the printing cylinder 18 changes. In order to cope with this, in the present embodiment, the driving state of the conveyor MC MC is controlled so that the speed of the conveyor 28 coincides with the peripheral speed of the outer diameter of the printing cylinder 18 including the printing plate 20. Specifically, as will be described later, assuming that the peripheral speed of the outer diameter of the printing cylinder when using a standard 7 mm thick printing plate is the peripheral speed Vp, the transport speed by the transport conveyor 28 is the speed Vp. To be. On the other hand, when the peripheral speed of the outer diameter of the printing cylinder when the thin printing plate is used is the peripheral speed Vp × D1 / D0, the transport speed by the transport conveyor 28 is set to the speed Vp × D1 / D0. For this reason, even if the printing plates 20 having different thicknesses are used, the peripheral speed (= printing plate peripheral speed) of the outer periphery of the printing cylinder 18 and the conveying speed of the corrugated board sheet S can always be matched. Can be improved.

  Similarly, the motor MI for driving the ink supply roll 22 is also controlled by controlling the rotational speed of the ink supply roll 22 to coincide with the peripheral speed of the outer diameter of the printing cylinder 18 including the printing plate 12. Ink can be transferred from the roll 22 to the printing plate 20 of the printing cylinder 18 with high accuracy.

  Next, the feed roll speed control content (details will be described later) and the printing phase shift amount calculation method will be described with reference to FIGS. FIG. 5 shows a case in which a corrugated sheet with a minimum dimension (Kmin) is supplied (FIG. 5 (a)) and a case in which a corrugated board with a maximum dimension (Kmax) is supplied in the corrugated board box making machine according to the embodiment of the present invention. It is a figure which shows the content of the speed control of the feed roll of FIG.5 (b).

  First, as shown in FIG. 5A, when a corrugated cardboard sheet S having a minimum dimension (sheet length in the sheet conveying direction is Kmin) is supplied, the speed V3 of the feed roll 4 is set so that the leading end of the corrugated cardboard sheet S is the feed roll 4. When the rear end of the corrugated board sheet S leaves the feed roll 4 (that is, when the front end of the corrugated board sheet S moves by a distance of Kmin from the feed roll 4), The feed roll motor MF is controlled by the control device 10 so as to be equal to the transport speed V2 of 28. That is, the feed roll speed V3 = V1 → V2.

  Next, as shown in FIG. 5B, when supplying the corrugated cardboard sheet S having the maximum dimension (the sheet length in the sheet conveying direction is Kmax), the speed V3 of the feed roll 4 is such that the leading end of the corrugated cardboard sheet S is the feed roll. 4 is controlled so as to be equal to a kicker speed V1 to be described later, and the position where the tip of the corrugated cardboard sheet S is moved from the feed roll 4 by a distance of Kmin (= fixed value) equal to the length of the corrugated cardboard sheet S of the smallest dimension. When it reaches (= reference position (P1)), the control device 10 controls the feed roll motor MF so as to be equal to the transport conveyor speed V2. That is, the feed roll speed V3 = V1 → V2. Thereafter, the relationship of V3 = V2 is maintained until the rear end of the corrugated cardboard sheet S having the maximum size leaves the feed roll 4.

  As described above, in the corrugated board box making machine 1 according to the present embodiment, the feed roll speed V3 is set when the leading end of the corrugated board sheet S reaches the reference position P1 (Kmin) regardless of the length of the corrugated board sheet S. The transfer speed is controlled to be equal to the transfer speed V2 of the transfer conveyor 28. In other words, in the corrugated board box making machine 1 of the present embodiment, after the leading end of the corrugated board sheet S reaches the reference position, the speed of the feed roll 4 coincides with the transport speed of the transport conveyor 28 (feed roll 4 and the transfer conveyor 28).

Accordingly, when a printing plate having a printing plate thickness of 3 mm is used in the corrugated board box making machine 1 according to the present embodiment (the outer diameter D1 of the printing cylinder 18), the “printing phase shift amount” in each printing unit 12, 14, 16 “δi” is calculated by the following equation based on the outer diameter D0 of the printing cylinder 18 when the standard printing plate (7 mm) is used.
δi = (Li−Kmin) × (1−D1 / D0) + α
Here, Li is the distance from the center position of the feed roll to the center position of each printing cylinder 18 (= fixed value), Kmin is the distance from the center position of the feed roll 4 to the reference position (= fixed value), and α is cardboard. A deviation amount (= fixed value) generated while the leading edge of the sheet S moves from the feed roll 4 to the reference position is represented.
(1-D1 / D0) corresponds to the speed difference between the conveying conveyor speed when using a standard stamp (thickness 7 mm) and the conveying conveyor speed when using a printing plate (thickness 3 mm) having a different thickness (represents the speed difference). ) Constant.

  α is the peripheral speed of the printing cylinder when using the standard stamp (thickness 7 mm) (= conveyor speed when using the standard stamp (thickness 7 mm)) and the peripheral speed of the feed roll (= corrugated sheet transport) Speed), and the duration during which the speed difference occurs while the leading edge of the cardboard sheet S moves from the feed roll 4 to the reference position.

Thus, in the corrugated board box making machine 1 according to the present embodiment, when calculating the printing phase shift amount δi, the distance (L−Kmin) from the reference position to the printing cylinder is used, and the “corrugated sheet length "Is irrelevant.
In this way, the phase of the printing cylinder 18 is corrected in the non-printing area of the printing cylinder 18 by the printing cylinder motor MP by the printing phase deviation amount δi obtained in advance to prevent printing deviation due to the printing phase deviation amount. Yes.

  The “printing phase shift amount δi” is calculated in advance in each printing unit 12, 14, 16. In this case, the distance between the feed roll 4 and the printing cylinder 18 in each printing unit 12, 14, 16 is L1, L2, L3 as shown in FIG. Similarly, in each printing unit, the printing cylinder phase is corrected by the printing cylinder motor MP by the printing cylinder motor MP for each printing phase deviation amount δi to prevent printing deviation due to the printing phase deviation amount.

  Next, the operation of the kicker device will be described with reference to FIGS. FIG. 6 shows the kicker position (position of the tip of the kicker with respect to the back guide) and the rotation angle of the crank mechanism (rotation angle of the flywheel) in the kicker type paper feeder of the corrugated board box making machine according to the embodiment of the present invention. 7 is a diagram showing the relationship between the kicker speed (V1) and the rotation angle (θ1) of the crank mechanism.

  First, the feeding operation of one cardboard sheet by the kicker 52 of the kicker device 42 and the operation of one rotation of the printing cylinder are synchronized. Accordingly, since the printing cylinder 18 when the standard printing plate 20 having a thickness of 7 mm is used has the reference diameter D0 (mm) as described above, when the rotation angle θ1 of the crank mechanism 44 advances by 1 degree, the outer periphery of the printing cylinder 18 is increased. The surface rotates in the conveying direction of the corrugated board sheet S by D0 × π / 360 (mm). At this time, the peripheral speed of the printing cylinder 18 per unit angle of θ1 is Vp = D0 × π / 360.

Here, with respect to the standard printing plate 20 having a thickness of 7 mm, if the diameter of the printing cylinder 18 when using the thin printing plate 20 having a thickness of 3 mm is D1, the printing cylinder when using the thin printing plate 20 is used. The outer peripheral speed of 18 is Vp × D1 / D0.
Note that the distance from the position of the front gate where the leading end of the corrugated cardboard sheet S abuts to the center of the feed roll at the start of sheet feeding (= the amount of progress of the kicker 52 based on the back guide 40 until the leading end of the corrugated cardboard sheet reaches the feed roll) ) Is Xβ.

  Next, the operation of the kicker device 42 will be described. As shown in FIG. 7, when the rotation angle of the crank mechanism 44 is θ1 = α (degrees), the speed (V1) of the kicker 52 becomes the maximum speed Vmax. The maximum speed Vmax of the kicker 52 is higher than the peripheral speed Vp of the printing cylinder 20 when the standard printing plate is used. Assuming that the amount of advancement of the corrugated cardboard sheet S based on the position of the back guide 42 when the kicker 52 is at the highest speed is Xα, the amount of advancement Xα is as shown in FIG. It is smaller than the amount of progress of the kicker at the time of arrival (= Xβ). That is, the kicker 52 reaches the maximum speed before the leading end of the cardboard sheet S reaches the center position of the feed roll 4, decelerates from there, and V1 = Vp. In this way, the kicker 52 enters the deceleration stage, and the speed (V1) of the kicker 52, that is, the supply speed of the corrugated cardboard sheet S is that of the printing cylinder 18 when the standard thickness printing plate (7 mm) is used. The motor MK for the kicker device is controlled so that the front end of the corrugated cardboard sheet S reaches the feed roll 4 when it coincides with the outer peripheral speed Vp.

  Next, the contents of the variable speed control of the feed roll will be described with reference to FIGS. FIG. 8 is a diagram showing the speed control content of the feed roll when a thin stamp (3 mm) is used, and FIG. 9 shows the speed control content of the feed roll when a standard thickness stamp (7 mm) is used. FIG.

  As shown in FIG. 8, when a cardboard sheet S having a minimum size (= Kmin) is supplied when a thin stamp (3 mm) is used, the leading edge of the cardboard sheet S reaches the feed roll. , Θ1 = β (see FIGS. 6 and 7), and at this time, the speed V3 of the feed roll 4 is set to the speed Vp. Then, from when θ1 = β until the rear end of the corrugated board sheet leaves the feed roll 4 (that is, from when the leading end of the corrugated board sheet reaches the feed roll 4, it passes through the feed roll to a distance of Kmin). The speed (V3) of the feed roll 4 is decelerated from the speed Vp to the speed Vp × D1 / D0, which is the peripheral speed of the outer diameter of the printing cylinder when the thin printing plate is used.

More specifically, as shown in FIG. 8, the speed V3 of the feed roll 4 is changed to the speed Vp until the rotation angle θ1 of the crank mechanism advances from β to φmin (= Kmin ÷ (D0 × π / 360)). To Vp × D1 / D0.
Here, φmin is a standard thickness printing plate (7 mm), and when the speed (V3) of the feed roll 4 is kept constant at the speed Vp, the tip of the corrugated cardboard sheet S reaches the feed roll 4. After that, the rotation angle θ1 of the crank mechanism advances while the distance of Kmin is reached.

  As shown in the diagram of FIG. 8, in the feed roll control of the present embodiment, the speed V3 of the feed roll 4 is such that the rotation angle of the crank mechanism advances by φmin after the leading end of the corrugated board sheet S reaches the feed roll. At this point, the speed is controlled to coincide with the transport speed Vp × D1 / D0 by the transport conveyor 28.

  As a result, the speed (V3) of the feed roll 4, that is, the speed of the cardboard sheet S, is conveyed by the time when the corrugated sheet S having the minimum dimension leaves the feed roll 4, that is, reaches the reference position described above. It can be made to correspond to the conveyance speed Vp × D1 / D0 by the conveyor 28. That is, as described above, φmin is constant when the speed (V3) of the feed roll 4 is kept constant at the speed Vp of the standard thickness printing plate (7 mm), and the tip of the corrugated cardboard sheet S reaches the feed roll 4. After that, the rotation angle θ1 of the crank mechanism advances while the distance of Kmin is reached. Accordingly, as shown in FIG. 8, the angular position at which the corrugated cardboard sheet having the minimum dimension is separated from the feed roll by an amount corresponding to the speed reduction of the feed roll is an angular position delayed from φmin (an angular position larger than φmin). In this way, the deceleration is completed before the minimum size cardboard sheet leaves the feed roll, and when the minimum size cardboard sheet leaves the feed roll, the speed of the cardboard sheet S matches the speed of the conveyor. Therefore, the occurrence of slip does not occur.

In this control, when the speed of the cardboard sheet S is linearly decelerated from the speed Vp to the speed Vp × D1 / D0 (constant acceleration / deceleration) as shown in FIG. The deviation amount generated during the movement from the feed roll 4 to the reference position is calculated by the following equation.
α = Kmin (1-D1 / D0) / 2

When the corrugated cardboard sheet S having the minimum size is separated from the feed roll 4, that is, when the cardboard sheet S reaches the reference position described above, the speed (V3) of the feed roll 4 is set to the transport speed Vp × D1 / D0 by the transport conveyor 28. You may control so that it may correspond.
For example, the speed (V3) of the feed roll 4 is linearly decelerated from the speed Vp when the corrugated board sheet S reaches the feed roll 4, and becomes the speed Vp × D1 / D0 when the rear end of the corrugated board sheet leaves. When controlled in this way, α described above is calculated by the following equation.
α = 2Kmin (D0−D1) / (D0 + D1)

Next, as shown in FIG. 8, when a cardboard sheet S having a maximum dimension (= Kmax) is supplied when a thin printing plate (3 mm) is used, the leading end of the cardboard sheet S reaches the feed roll. Similarly, when θ1 = β (see FIGS. 6 and 7), the speed V3 of the feed roll 4 is set to the speed Vp. The speed (V3) of the feed roll 4 is changed from the speed Vp to the outer diameter of the printing cylinder when the thin printing plate is used from when θ1 = β until the distance (reference position) of Kmin is reached. The speed is reduced to the speed Vp × D1 / D0, which is the peripheral speed. The details of the control (such as the relationship between the rotation angle θ1 of the crank mechanism and the speed of the feed roll 4) are the same as in the case of the corrugated cardboard sheet S having the minimum dimensions described above.
Thereafter, the speed (V3) of the feed roll 4 is set to a speed Vp × D1 / D0 which is the peripheral speed of the outer diameter of the printing cylinder when using a thin printing plate until the rear end of the corrugated cardboard sheet leaves the feed roll 4. It is supposed to be retained.

  Specifically, the basic equation φmax = Kmax ÷ (D1 × π / 360) is used, and the speed Vp × D1 / D0 is maintained until the crank mechanism rotation angle θ1 reaches φmax. Therefore, it can be made to correspond to conveyance speed VpxD1 / D0 by the conveyance conveyor 28 until the corrugated board sheet S of the maximum dimension leaves | separates from the feed roll 4. FIG. Here, φmax is the maximum size of the corrugated cardboard sheet S when a printing plate (3 mm) thinner than the standard thickness is used and the speed (V3) of the feed roll 4 is kept constant at the speed Vp × D1 / D0. This is the angle at which the rotation angle θ1 of the crank mechanism advances while the tip reaches the feed roll 4 and reaches the distance Kmax.

  With such setting of φmax, even when the corrugated cardboard sheet S having the maximum dimension is separated from the feed roll 4, the speed (V3) of the feed roll 4, the speed of the corrugated cardboard sheet S, and the transport speed Vp × by the transport conveyor 28. D1 / D0 can be matched with each other. That is, since the corrugated board sheet S is fed at a speed component faster than Vp × D1 / D0 during φmin as described above, the angular position at which the corrugated board sheet of the maximum size moves away from the feed roll is advanced from φmax. This is an angular position (an angular position smaller than φmax). Then, as shown in FIG. 8, the next speed change control of the feed roll 4 is performed from the angle position of φmax.

  Next, as shown in FIG. 9, when a standard thickness printing plate (7 mm) is used, and a corrugated cardboard sheet S having a minimum dimension (= Kmin) is supplied and a corrugated cardboard having a maximum dimension (Kmax) In both cases where the sheet S is supplied, the speed (V3) of the feed roll 4 is maintained at the same speed as the peripheral speed Vp of the outer diameter of the printing cylinder 18 when the standard thickness printing plate is attached.

  Specifically, when the standard thickness printing plate (7 mm) is used and the cardboard sheet S having the minimum dimension (= Kmin) is supplied, the leading end of the cardboard sheet S is fed as described above. When reaching the roll, the speed of the kicker 52 is Vk = Vp, so the speed (V3) of the feed roll is also V3 = Vk = Vp, and then the rear end of the corrugated cardboard sheet feeds the feed roll 4 Until the time of separation, the speed Vp, which is the peripheral speed of the outer diameter of the printing cylinder when the standard printing plate is used, is maintained. Specifically, according to the same basic formula φmin = Kmin ÷ (D0 × π / 360) as the above-described formula that is practically used, the speed of the feed roll 4 is varied while the rotation angle θ1 of the crank mechanism is between β and φmin. (V3) is maintained at the speed Vp.

  Next, when the standard thickness printing plate (7 mm) is used and the corrugated sheet S having the maximum dimension (= Kmax) is supplied, similarly, the leading end of the corrugated sheet S reaches the feed roll. Since the speed of the kicker 52 is Vk = Vp, the speed (V3) of the feed roll is also set to V3 = Vk = Vp, and then the leading end of the corrugated board sheet S passes through the feed roll 4 for Kmin. The speed (V3) of the feed roll 4 is kept at the speed Vp until it reaches the distance. Thereafter, the speed (V3) of the feed roll 4 is maintained at the speed Vp that is the peripheral speed of the outer diameter of the printing cylinder when the standard printing plate is used until the rear end of the corrugated cardboard sheet leaves the feed roll 4. It is like that. More specifically, according to the basic formula φmax = Kmax ÷ (D0 × π / 360) that is practically used, the speed (V3) of the feed roll 4 is the speed while the rotation angle θ1 of the crank mechanism is between β and φmax. Held at Vp.

  As described above, in the corrugated board box making machine according to the present embodiment, the control device 10 causes the rotation speed (V3) of the feed roll 4 to be supplied when the leading end of the corrugated board sheet S reaches the feed roll 4. It is controlled so as to coincide with the supply speed (= Vp) of the corrugated cardboard sheet S by the kicker device 42 which is the paper device 2, and the leading end of the corrugated cardboard sheet S passes through the feed roll 4 and has the minimum dimension (Kmin). When the reference position corresponding to the length of the corrugated cardboard sheet (= Kmin) is reached, the speed of the conveyor 28 (specifically, the peripheral speed of the outer diameter of the printing cylinder when a standard thickness printing plate is used) Vp or the peripheral speed of the outer diameter of the printing cylinder when using a thin printing plate (speed equal to Vp × D1 / D0). Therefore, regardless of the length (Kmin, Kmax) of the corrugated cardboard sheet, the speed of the corrugated cardboard sheet S coincides with the speed of the transport conveyor 28 at the moment when the corrugated cardboard sheet S leaves the feed roll 4. It is possible to reliably prevent the cardboard sheet from slipping (displacement), which has been caused by the difference between the cardboard sheet speed and the conveyor speed.

  Further, in the present embodiment, the thickness of the printing plate 20 attached to the printing cylinder 18 is changed, and the speed of the conveyor 28 is made to coincide with the peripheral speed (Vp or Vp × D1 / D0) of the outer diameter of the printing cylinder. The amount of printing phase shift caused by the distance from the center position of the feed roll 4 to the center position of the printing cylinder 18 (L1, L2, L3), the minimum size cardboard sheet length (Kmin), and the speed of the conveyor 28 Therefore, it is not necessary to correct the printing phase shift amount every time the cardboard sheet length is different, and the correction of the printing phase shift amount δi of the printing cylinder 28 is simplified.

  In the corrugated board box making machine according to the present embodiment, as described above, when a printing plate having a thickness (3 mm) thinner than the standard printing plate is attached to the printing cylinder and the corrugated board sheet has a minimum dimension (Kmin), The rotation speed of the feed roll 4 is increased once so that the leading edge of the cardboard sheet S reaches the feed speed of the sheet fed by the sheet feeding device 2 when the leading edge of the cardboard sheet S reaches the feed roll 4. From the point of time until the trailing edge of the corrugated board sheet S moves away from the feed roll 4, the sheet feeding speed by the sheet feeding device 2 is decelerated to a speed that matches the speed of the conveying means (Vp × D1 / D0). Therefore, when the corrugated cardboard sheet having the minimum dimension is separated from the feed roll 4, slippage of the corrugated cardboard sheet S is surely prevented. Door can be.

  In the box making machine for corrugated cardboard sheets according to the present embodiment, as described above, when a printing plate having a thickness (3 mm) thinner than the standard printing plate is attached to the printing cylinder and the corrugated cardboard sheet has the maximum dimension (Kmax), The rotational speed of the feed roll 4 is once increased so as to coincide with the sheet supply speed of the sheet feeding device 2 when the leading end of the corrugated cardboard sheet reaches the feed roll 4, and the leading end of the corrugated cardboard sheet S moves the feed roll 4. By the time when the sheet passes through and reaches the reference position (P1) corresponding to the length of the corrugated sheet of the minimum dimension (Kmin), the sheet feeding speed (Vp) from the sheet feeding device 2 to the speed of the conveying means (Vp × D1) / D0), and then the rotational speed (Vp ×) when reaching the reference position until the rear end of the corrugated board sheet leaves the feed roll. D1 / D0) is controlled so that even when the cardboard sheet has the maximum size, the cardboard sheet S can be reliably prevented from slipping at the moment when it is separated from the feed roll 4.

  Furthermore, in the corrugated board box making machine according to the present embodiment, as described above, as the sheet feeding device 2, the rotational operation of the corrugated cardboard sheet S stacked by the kicker 52 is converted into the reciprocating operation by the crank mechanism 44. Since the kicker device 42 that pushes out the lower corrugated cardboard sheets S one by one is used, the control device 10 sets the speed of the kicker 52 to the maximum speed immediately before the leading edge of the corrugated cardboard sheet S reaches the feed roll 4. I try to control it. Thereby, in this embodiment, the cardboard sheet | seat S can be effectively supplied to the feed roll 4 using the characteristic of the kicker which converts rotation operation into reciprocation. In particular, when the kicker 52 is decelerated from the maximum speed, the leading end of the corrugated cardboard sheet S is supplied to the feed roll 4. Therefore, when the feed roll 4 is controlled to a variable speed as in this embodiment, the control is performed. It is possible to suppress the influence exerted on the shift of the feed roll 4 by.

  In the above embodiment, the kicker device is used as the paper feeding device. However, the present invention is not limited to this, and the corrugated cardboard sheet is fed by a paper feeding roller provided below the lowermost corrugated cardboard sheet. You may make it use the rotary-type paper feeder which supplies one sheet at a time.

  In the above-described embodiment, for the sake of convenience, the length of the corrugated cardboard sheet has been described for the minimum dimension (Kmin) and the maximum dimension (Kmax). However, in the present embodiment, the minimum dimension (Kmin) and the maximum dimension (Kmax) are described. ), And the speed of the feed roll 4 may be controlled at a variable speed in the same manner as described above.

DESCRIPTION OF SYMBOLS 1 Box making machine for corrugated cardboard sheets 2 Feeder 4 Feed roll 6 Printing unit 10 Control unit 12, 14, 16 Printing unit 18 Printing cylinder 20 Printing plate 22 Ink supply roll 24 Ink squeeze roll 26 Receiving roll 28 Conveyor conveyor 36 Table 38 Front gate 40 Back guide 42 Kicker device 46 Crank mechanism 44 Flywheel 52 Kicker 66 Frame 68 Rail S Corrugated sheet MP Printing cylinder motor MI Ink supply roll motor MC Conveyor motor MF Feed roll motor MK Kicker motor Kmin Minimum dimension cardboard sheet length Kmax Maximum dimension cardboard sheet length D0 Standard stamp (7 mm) printing cylinder outer diameter D1 Thin printing plate (3 mm) printing cylinder outer diameter V3 Feed roll Rate of speed V1 kicker speed V2 the conveyor

Claims (6)

A corrugated sheet box making machine having a printing section for printing on a corrugated cardboard sheet,
A printing section that prints on a corrugated cardboard sheet by a printing cylinder to which a plurality of different thickness printing plates can be attached;
Conveying means for conveying the cardboard sheet in the printing unit;
A feed roll provided on the upstream side of the conveying means, and supplying the cardboard sheets one by one to the conveying means;
A sheet feeding device that is provided upstream of the feed roll and feeds the lowermost corrugated cardboard sheets one by one to the feed roll;
A controller for controlling the operation of the printing cylinder, the operation of the conveying means, the operation of the feed roll, and the operation of the paper feeding device,
The control unit first controls the speed of the conveying means so as to coincide with the peripheral speed of the outer diameter of the printing cylinder including the printing plate, and secondly, from the center position of the feed roll, Distance to the center position, minimum corrugated sheet length, speed difference of the above conveying means when using a standard printing plate and a printing plate with a thickness different from the standard printing plate, and leading edge of the corrugated cardboard sheet Based on the amount of deviation that occurs during the movement from the feed roll to the reference position corresponding to the length of the corrugated cardboard sheet having the smallest dimension, the printing phase deviation amount in the printing unit is obtained in advance, and the printing cylinder is equivalent to this printing phase deviation amount. And third, the rotation speed of the feed roll is adjusted when the leading edge of the corrugated cardboard sheet reaches the feed roll. The corrugated cardboard sheet is controlled so as to coincide with the speed and controlled so as to coincide with the speed of the conveying means when the leading end of the corrugated cardboard sheet passes through the feed roll and reaches the reference position. Box machine.   A plurality of the printing cylinders are provided, and the controller controls, for each printing cylinder, the distance from the center position of the feed roll to the center position of each printing cylinder, the minimum cardboard sheet length, and the conveying means. The printing for corrugated cardboard sheets according to claim 1, wherein a printing phase shift amount in each printing cylinder is obtained in advance based on the speed difference, and the phase of each printing cylinder is corrected by the printing phase shift amount before starting printing. apparatus.   The control unit attaches a printing plate having a thickness smaller than that of a standard printing plate to the printing cylinder and when the corrugated cardboard sheet has a minimum size, the rotation speed of the feed roll is determined when the leading end of the corrugated cardboard sheet reaches the feed roll. The corrugated sheet supplied by the paper feeder is matched with the supply speed of the corrugated paper sheet by the paper feeder and from when the leading edge of the cardboard sheet reaches the feed roll until when the rear end of the cardboard sheet is separated from the feed roll. 3. A corrugated cardboard sheet printing apparatus according to claim 1, wherein control is performed so as to decelerate from a supply speed of said sheet to a speed that coincides with the speed of said conveying means.   The control unit attaches a printing plate having a thickness smaller than that of the standard printing plate to the printing cylinder, and when the corrugated cardboard sheet has the maximum size, the rotation speed of the feed roll is determined when the leading end of the corrugated cardboard sheet reaches the feed roll. The sheet feeding speed of the corrugated sheet by the sheet feeding device, and the sheet feeding by the time when the leading end of the corrugated sheet passes through the feed roll and reaches a reference position corresponding to the length of the corrugated sheet having the smallest dimension. Decrease from the cardboard sheet supply speed by the apparatus to a speed that matches the speed of the conveying means, and then hold the rotational speed at the time when the reference position is reached until the rear end of the cardboard sheet leaves the feed roll. The corrugated cardboard printing apparatus according to any one of claims 1 to 3, wherein the cardboard sheet printing apparatus is controlled.   The sheet feeding device includes a kicker device that converts a rotational operation into a reciprocating operation by a crank mechanism and pushes out the lowermost corrugated cardboard sheets of the corrugated cardboard stacked one by one with the kicker. 5. The corrugated cardboard printing apparatus according to claim 1, wherein the speed of the corrugated cardboard sheet is controlled to reach a maximum speed before reaching the feed roll. 6.   2. The corrugated cardboard sheet printing apparatus according to claim 1, wherein the sheet feeding device is a rotary type in which the corrugated cardboard sheets are fed one by one by a sheet feeding roller provided below the lowermost corrugated cardboard sheet. .

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