JP2019112153A - Corrugated board sheet feeder and corrugated board sheet box making machine - Google Patents

Abstract

To suppress conveyance deviation of a corrugated board sheet caused by a change in weight of the corrugated board sheet stacked on a feed table.SOLUTION: A corrugated board sheet feeder 2 sends out a corrugated board sheet that is a lowermost layer among corrugated board sheets stacked on a feed table 20 one by one by performing variable speed control of roller motors 90, 91, 102 and 103 on the basis of a speed control pattern including an acceleration region, a constant speed region and a deceleration region for controlling rotations of feed rollers 124 to 127. The corrugated board sheet feeder 2 changes the speed control pattern in the acceleration region, on the basis of a sheet weight-related value in relation to weight of the corrugated board sheets stacked on the feed table 20 in such a manner that feed timing of the corrugated board sheet from the corrugated board sheet feeder 2 becomes constant without depending on a change in weight of the corrugated board sheets stacked on the feed table 20 during execution of one order production.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a corrugated cardboard sheet feeding apparatus for feeding stacked corrugated cardboard sheets one by one, and a corrugated cardboard sheet making machine having the corrugated cardboard sheet feeding apparatus.

  Conventionally, lamination is performed using a plurality of feeding rollers that rotate along the feeding direction of a corrugated cardboard sheet, and a grate that adjusts contact and separation between the feeding roller and the corrugated cardboard sheet by moving up and down with respect to the feeding roller. A corrugated cardboard sheet feeding device (so-called rotary feeder) for feeding the corrugated cardboard sheets one by one to a printing apparatus is applied to a carton sheet making machine.

  Such corrugated sheet feeders are disclosed, for example, in Patent Documents 1 and 2. Patent Document 1 discloses a corrugated cardboard sheet feeding apparatus in which rotational movement of a drive shaft is converted into operation of each component via a mechanical transmission. On the other hand, Patent Document 2 controls the drive motor based on a predetermined speed control pattern (electronic cam control) to operate the respective components, thereby causing mechanical components as described in Patent Document 1 Discloses a corrugated sheet feeder which eliminates the need for a flexible transmission.

U.S. Pat. No. 4,614,335 JP, 2016-128355, A

  In the corrugated sheet feeder as described above, the weight of the pile of sheets stacked above the sheet is given to the upper surface of the lowermost corrugated sheet among the laminated corrugated sheets to be fed. Ru. Then, when the lowermost corrugated sheet is delivered, a frictional force (load) caused by the weight of the sheet pile is generated on the upper surface of the sheet. When the weight of the sheet pile is large, since the frictional force is large, the feeding timing of the corrugated sheet from the corrugated sheet feeding device tends to be delayed. The weight of the sheet pile increases as the height of the laminated cardboard sheets (hereinafter simply referred to as "stacked height" as appropriate) increases. As for the above-mentioned feeding timing, the rear end of the lowermost corrugated sheet among the corrugated sheets stacked on the feeding table comes out of the corrugated sheet feeding device, and to the downstream side of the corrugated sheet feeding device. It means the timing of being sent out.

  By the way, in a corrugated sheet making machine, in the preparation operation before production, one corrugated sheet is fed by the corrugated sheet feeding device to adjust the rotational phase of the printing cylinder, slotter and die cylinder on the downstream side (so-called register) Adjustment is performed. In this preparation work, only one corrugated cardboard sheet is fed for trial processing, the processing position of the finished corrugated cardboard sheet is confirmed, and the printing plate or slotter knife so that the processing position is exactly on the predetermined position on the sheet. And it is done to adjust the rotational phase of the punched wood mold. When performing such preparation work, the cardboard sheets are already stacked high on the feeding table. For this reason, the lowermost corrugated sheet which is fed one sheet in the preparation operation is sent out from the corrugated sheet feeder under a condition where a large frictional force is generated because the weight of the sheet piles is heavy. That is, the cardboard sheet is fed out under the condition that the feeding timing tends to be delayed. Therefore, the rotational phase of each processing unit is adjusted in accordance with the corrugated cardboard sheet delivered under such conditions.

  When the preparation work as described above is completed and the actual production in the corrugated sheet box making machine starts, the corrugated sheet sheet feeding device continuously feeds out the corrugated sheet one by one, so that on the feeding table The pile height of the seat gradually decreases. As the stacking height decreases, the weight of the pile of sheets decreases, and the frictional force generated on the upper surface of the lowermost corrugated sheet decreases. Therefore, the feeding timing of the lowermost corrugated sheet tends to be advanced. As the corrugated sheet is fed earlier, the corrugated sheet reaches the downstream processing units earlier.

  Here, due to the rotational phase adjustment in the preparatory work as described above, each processing unit is rotating at the timing according to the corrugated sheet delivered under the condition that the feeding timing tends to be delayed. When the feeding timing of the corrugated cardboard sheet is lowered by lowering the corrugated sheet, the position in the conveying direction (feeding direction) of the corrugated cardboard sheet is shifted relative to each processing unit on the downstream side of the corrugated sheet feeding device (below) Appropriately called "conveyance deviation"). Specifically, a leading shift occurs, which is a state in which the corrugated cardboard sheet is advanced relative to each processing unit. When such a forward shift occurs, the processing position on the corrugated cardboard sheet may shift, and the sheet may be a defective product.

  The present invention has been made to solve the above-mentioned problems, and it is possible to appropriately suppress the conveyance deviation of the corrugated sheet caused by the change in weight of the corrugated sheet stacked on the feeding table. It is an object of the present invention to provide a sheet feeding apparatus and a corrugated sheet manufacture.

In order to achieve the above object, the present invention is a corrugated sheet feeder, which comprises: a feeding table on which laminated corrugated sheets are placed; and the corrugated sheet stacked on the feeding table. The feeding roller for feeding the lowermost corrugated sheet one by one, a roller motor for rotating the feeding roller, an acceleration region for accelerating the rotation of the feeding roller, and the feeding roller after this acceleration region The roller motor is variably controlled based on a speed control pattern including a constant speed area for rotating at a constant speed and a speed reduction area for decelerating the rotation of the feeding roller after the constant speed area. And a controller configured to feed the corrugated cardboard sheet by the feeding roller, the controller being stacked on the feeding table while performing one-to-one production. The feed timing at which the rear end of the lowermost corrugated sheet comes out of the corrugated sheet feeder and is fed to the downstream side of the corrugated sheet feeder is constant regardless of the change in weight of the corrugated sheet. It is characterized in that it is arranged to change the speed control pattern of the acceleration zone based on the sheet weight related values related to the weight of the corrugated cardboard sheets stacked on the feeding table.
According to the present invention configured as described above, while one order production is being performed, the feeding timing is fixed so that the feeding timing becomes constant regardless of the change in weight of the corrugated cardboard sheet on the feeding table. The speed control pattern of the acceleration zone is changed based on the sheet weight related values related to the weight of the corrugated cardboard sheet stacked on the feed table. Thereby, the conveyance shift (advance shift) of the cardboard sheet caused by the change of the weight of the cardboard sheet on the feeding table as described above can be appropriately suppressed.

In the present invention, preferably, the control device is configured to change the speed control pattern of the acceleration region so as to change the timing of starting the acceleration of the cardboard sheet based on the sheet weight related value.
According to the present invention configured as described above, by changing the timing at which acceleration of the corrugated cardboard sheet is started, the feeding timing can be appropriately constant regardless of the change in weight of the corrugated cardboard sheet on the feeding table. Be able to maintain. In addition, since the acceleration start timing is changed while maintaining the same magnitude of acceleration, it is possible to suppress the slip of the cardboard sheet on the feeding roller. That is, although the corrugated sheet tends to slip on the feeding roller when the acceleration is increased, such slip can be suppressed by maintaining the magnitude of the acceleration the same. Therefore, stable delivery by the corrugated sheet feeder can be secured.

In the present invention, preferably, the control device is configured to change the speed control pattern of the acceleration region so as to change the magnitude of the acceleration when accelerating the corrugated cardboard sheet based on the sheet weight related value.
According to the present invention configured as described above, by changing the magnitude of the acceleration when accelerating the corrugated cardboard sheet, the feeding timing can be appropriately adjusted regardless of the change in weight of the corrugated cardboard sheet on the feeding table. You will be able to keep it constant. In addition, since the magnitude of the acceleration is changed while maintaining the same acceleration start timing, it is possible to suppress that the lowermost cardboard sheet falls and slips on the feeding roller during acceleration. That is, when acceleration start timing is advanced, acceleration of the feed roller starts before the lowermost corrugated sheet contacts the feed roller, and the lowermost corrugated sheet may slip when it contacts the feed roller. However, if the acceleration start timing is kept the same, the difference between the timing at which the lowermost cardboard sheet contacts the feed roller and the timing at which the feed roller starts to accelerate is kept constant. Slip can be suppressed. Therefore, stable delivery by the corrugated sheet feeder can be secured.

In the present invention, preferably, the control device delays the timing to start acceleration of the cardboard sheet when the sheet weight related value is less than the predetermined threshold than when the sheet weight related value is greater than the threshold. And / or is configured to change the speed control pattern of the acceleration region so as to reduce the magnitude of the acceleration when accelerating the corrugated cardboard sheet.
According to the present invention configured as described above, when the weight of the corrugated cardboard sheet on the feeding table decreases, the feeding timing tends to be advanced, so to determine the size of the sheet weight related value corresponding to the sheet weight. Of the acceleration at which acceleration of the corrugated cardboard sheet is started and / or acceleration of the corrugated cardboard sheet by using the threshold value of the sheet weight related value below the threshold value than when the sheet weight related value is less than the threshold value. Reduce the size. As a result, the feeding timing can be effectively maintained constant regardless of the change in weight of the cardboard sheet on the feeding table.

In the present invention, preferably, the threshold value is set based on the specifications of the corrugated sheet delivered by the corrugated sheet feeder.
According to the present invention configured as described above, the occurrence of conveyance deviation can be appropriately suppressed for corrugated cardboard sheets of various specifications.

In the present invention, preferably, the specification of the corrugated cardboard sheet is a flute of the corrugated cardboard sheet, and the threshold is set to a smaller value as the flute is thinner.
When thin fluted corrugated cardboard sheets are compared to thick fluted corrugated cardboard sheets, the density of the corrugated cardboard sheets is higher, so the timing of feeding becomes faster due to the smaller weight of the corrugated cardboard sheets on the feeding table Tends to be relatively late, in other words, the stacking height of the corrugated cardboard sheets for which the feeding timing is advanced tends to be low (the same applies hereinafter). Therefore, in the present invention, the thinner the flute of the cardboard sheet, the smaller the threshold for determining the sheet weight related value. As a result, the occurrence of conveyance deviation can be appropriately suppressed for corrugated sheets of various flutes.

In the present invention, preferably, the specification of the corrugated sheet is the size of the corrugated sheet, and the threshold is set to a smaller value as the size is larger.
Large-size corrugated sheets have an increased weight per sheet as compared to small-sized corrugated sheets, so the feeding timing may be advanced due to the reduced weight of the corrugated sheets on the feeding table. The timing tends to be relatively late. Therefore, in the present invention, the larger the size of the corrugated cardboard sheet, the smaller the threshold for determining the sheet weight related value. Thereby, generation | occurrence | production of conveyance shift can be appropriately suppressed about the corrugated sheet of various dimensions.

In the present invention, preferably, the specification of the cardboard sheet is the basis weight of the cardboard sheet, and the threshold is set to a smaller value as the basis weight is larger.
A corrugated sheet having a large basis weight (corresponding to the density of the corrugated sheet) has an earlier feeding timing due to the smaller weight of the corrugated sheet on the feeding table as compared with the corrugated sheet having a small basis weight. Times tend to be relatively late. Therefore, in the present invention, the larger the basis weight of the cardboard sheet, the smaller the threshold for determining the sheet weight related value. Thereby, generation | occurrence | production of conveyance shift can be appropriately suppressed about the corrugated sheet of various basis weights.

In the present invention, preferably, the control device changes the state in which the sheet weight related value is equal to or more than the threshold value to the state which is less than the threshold value while feeding one corrugated sheet by the corrugated sheet feeder. In this case, it is configured not to change the speed control pattern of the acceleration area applied to send out the corrugated cardboard sheet.
According to the present invention configured as described above, even if the sheet weight related value changes from the state above the threshold to the state below the threshold during one cycle of feeding one corrugated cardboard sheet , Does not change the speed control pattern applied in this cycle period. As a result, it is possible to prevent an excessive load from being applied to the roller motor that rotationally drives the feeding roller.

In the present invention, preferably, the operator further includes an input device for inputting the threshold value, and the control device uses the threshold value input to the input device.
According to the present invention configured as described above, the operator can appropriately change the threshold in accordance with the order specification. Thus, various order specifications can be appropriately coped with.

In the present invention, preferably, the control device stores the threshold used in an order, and reads out the stored threshold when the order of the same specification as the order in which the threshold is stored is performed next. It is configured to apply.
According to the present invention configured as described above, the threshold value used in the past order can be automatically applied when the same specification order as this order is to be performed next. This can save the worker the trouble of changing the threshold every time.

In the present invention, preferably, the control device delays the timing of starting acceleration of the corrugated cardboard sheet based on the sheet weight related value and / or reduces the magnitude of acceleration when accelerating the corrugated cardboard sheet. , Changing the speed control pattern of the acceleration region and changing the feed adjustment amount indicating the amount of delaying the timing to start acceleration and / or the amount of decreasing the magnitude of acceleration based on the sheet weight related value ing.
According to the present invention configured as described above, the degree to which the feeding timing changes (specifically, the degree to which the feeding timing is advanced) changes according to the weight of the corrugated cardboard sheet on the feeding table. The amount of delaying the timing of starting acceleration of the corrugated cardboard sheet and / or the amount of decreasing the magnitude of acceleration when accelerating the corrugated cardboard sheet are changed in consideration of As a result, the feeding timing can be effectively maintained constant regardless of the change in weight of the cardboard sheet on the feeding table.

In the present invention, preferably, the feed adjustment amount is set based on the specifications of the corrugated sheet fed by the corrugated sheet feeder.
According to the present invention configured as described above, the occurrence of conveyance deviation can be appropriately suppressed for corrugated cardboard sheets of various specifications.

In the present invention, preferably, the specification of the corrugated cardboard sheet is a flute of the corrugated cardboard sheet, and the feeding adjustment amount is set to a larger amount as the flute is thinner.
Because the density of the corrugated sheet is higher in the thin fluted corrugated sheet compared to the thick fluted corrugated sheet, the weight change of the corrugated sheet on the feeding table as the feeding of the corrugated sheet proceeds Becomes large, and the degree to which feeding timing is advanced becomes large. Therefore, in the present invention, the thinner the flute of the corrugated cardboard sheet to be fed, the larger the feeding adjustment amount that indicates the amount to delay the timing to start acceleration of the corrugated cardboard sheet and / or to decrease the magnitude of the acceleration. As a result, the occurrence of conveyance deviation can be appropriately suppressed for corrugated sheets of various flutes.

In the present invention, preferably, the specification of the corrugated sheet is the size of the corrugated sheet, and the feeding adjustment amount is set to a larger amount as the size is larger.
Because the weight per sheet is larger in a large-sized corrugated sheet compared to a small-sized corrugated sheet, the change in weight of the corrugated sheet on the feeding table as the feeding operation of the corrugated sheet proceeds The amount increases, and the degree to which the feeding timing is advanced is increased. Therefore, in the present invention, the larger the size of the cardboard sheet to be fed out, the larger the above-mentioned feed adjustment amount. Thereby, generation | occurrence | production of conveyance shift can be appropriately suppressed about the corrugated sheet of various dimensions.

In the present invention, preferably, the specification of the cardboard sheet is the basis weight of the cardboard sheet, and the feeding adjustment amount is set to a larger amount as the basis weight is larger.
In the case of a large basis weight corrugated sheet, compared to a small basis weight corrugated sheet, the amount of change in weight of the corrugated sheet on the feeding table increases as the feeding operation of the corrugated sheet proceeds, The degree to which the timing is advanced becomes large. Therefore, in the present invention, the larger the basis weight of the cardboard sheet to be fed out, the larger the above-mentioned feed adjustment amount. As a result, the occurrence of conveyance deviation can be appropriately suppressed for corrugated paperboard sheets of various base papers.

In the present invention, preferably, the operator further includes an input device for inputting the feeding adjustment amount, and the control device uses the feeding adjustment amount input to the input device.
According to the present invention configured as described above, the operator can appropriately change the feed adjustment amount in accordance with the order specification. Thus, various order specifications can be appropriately coped with.

In the present invention, preferably, the control device stores the feed adjustment amount used in a certain order, and when the same specification order as the order in which the feed adjustment amount is stored is performed next, this storage It is configured to read out and apply the feed adjustment amount.
According to the present invention configured as described above, the feed adjustment amount used in the past order can be automatically applied when the order of the same specification as this order is subsequently performed. As a result, it is possible to save the operator the trouble of changing the feed adjustment amount every time.

In the present invention, preferably, the control device stores in advance a plurality of speed control patterns each having a different acceleration region, and among the plurality of speed control patterns, the speed control pattern according to the feed adjustment amount. Is configured to select and apply.
According to the present invention configured in this way, by storing a plurality of speed control patterns in advance, it is possible to rapidly apply the speed control pattern according to the feed adjustment amount, and to use it in practice. The operator can easily grasp the speed control pattern to be performed.

In the present invention, preferably, the control device is configured to determine and apply a speed control pattern according to the feed adjustment amount according to a predetermined calculation formula.
According to the present invention configured as described above, since the speed control pattern is obtained by calculation, there is no need to store the speed control pattern, and the storage capacity can be reduced.

In the present invention, preferably, the control device sends out two corrugated cardboard sheets during one rotation of the printing cylinder of the printing device provided on the downstream side of the corrugated cardboard sheet feeding device. Apply the speed control pattern to each of the two cardboard sheets, and apply the speed control pattern of the acceleration region applied to the cardboard sheet to be sent out first, and send it later out of the two cardboard sheets. Both acceleration region velocity control patterns applied to the other corrugated sheet are adapted to be changed based on sheet weight related values.
According to the present invention configured as described above, for both of the two corrugated cardboard sheets continuously fed in the so-called two-sheet feeding mode, the corrugated cardboard sheets resulting from the change in weight of the corrugated cardboard sheets on the feeding table It is possible to appropriately suppress the conveyance deviation.

In the present invention, preferably, the sheet weight related value is the height of the corrugated board sheet stacked on the feeding table.
According to the present invention configured as described above, the stack height of the corrugated cardboard sheet uniquely indicating the weight of the corrugated cardboard sheet on the feeding table is used as the sheet weight related value. As a result, it is not necessary to use the weight of the cardboard sheet itself which is relatively difficult to detect.

In the present invention, it preferably further comprises a sensor for detecting the height of the corrugated sheet stacked on the feeding table.
According to the present invention configured as described above, the stack height of the corrugated cardboard sheet can be accurately detected by using the sensor.

  In the present invention, preferably, the corrugated cardboard sheet making machine comprises: the corrugated cardboard sheet feeding device described above; and a plurality of processing devices provided downstream of the feeding direction by the corrugated cardboard sheet feeding device and including at least a printing device. It is good to have.

  According to the corrugated cardboard sheet feeding apparatus and corrugated cardboard sheet making machine of the present invention, it is possible to appropriately suppress conveyance deviation (advancing deviation) of the corrugated cardboard sheet caused by a change in weight of the corrugated cardboard sheet stacked on the feeding table. Can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the whole structure of the corrugated-cardboard sheet making machine by embodiment of this invention. It is a top view which shows the internal structure below the table of the corrugated-cardboard sheet feeding apparatus by embodiment of this invention. It is an expanded sectional view which looked at the corrugated-cardboard sheet feeding apparatus by embodiment of this invention along the AA line in FIG. It is a figure which shows typically the connection relation of the support mechanism and rocking mechanism of the corrugated-cardboard sheet feeding apparatus by embodiment of this invention. FIG. 7 is a view showing a state in which a swing angle of the swinging member changes in accordance with the rotation of the eccentric member of the swing mechanism in the embodiment of the present invention. It is a block diagram which shows the electric constitution of the corrugated-cardboard sheet making machine by embodiment of this invention. It is explanatory drawing about the product height judgment threshold value and shift amount setting value by embodiment of this invention. It is explanatory drawing about the setting screen of the product height determination threshold value and shift amount setting value by embodiment of this invention. It is explanatory drawing about the roller control pattern number by embodiment of this invention, and a roller control pattern. It is explanatory drawing about the basic roller control pattern which is the 1st example of the roller control pattern by embodiment of this invention. It is explanatory drawing about the 2nd example of the roller control pattern by embodiment of this invention. It is explanatory drawing about the operation | movement of grate when the 2nd example of the roller control pattern by embodiment of this invention is applied. It is an explanatory view about change timing of a roller control pattern by an embodiment of the present invention. It is an explanatory view about the 3rd example of a roller control pattern which is a modification of an embodiment of the present invention. It is explanatory drawing about the basic roller control pattern which is the 4th example of a roller control pattern by the modification of embodiment of this invention. It is explanatory drawing about the 5th example of a roller control pattern which is a modification of embodiment of this invention. It is explanatory drawing about the 6th example of a roller control pattern which is a modification of embodiment of this invention. It is explanatory drawing about the product height determination threshold value and shift amount setting value by the modification of embodiment of this invention.

  Hereinafter, a cardboard sheet feeding apparatus and a cardboard sheet making machine according to an embodiment of the present invention will be described with reference to the attached drawings.

[overall structure]
FIG. 1 is a front view showing an overall configuration of a corrugated sheet manufacturing apparatus according to an embodiment of the present invention. In FIG. 1, a corrugated cardboard sheet box making machine 1 feeds a corrugated cardboard sheet feeding device 2 for feeding the stacked corrugated cardboard sheets SH one by one, a printing device 3 for printing on the corrugated cardboard sheets SH, and places creases in the corrugated cardboard sheets SH. And a die cutter 5 for forming a punched portion having a predetermined shape on the cardboard sheet SH.

  The corrugated sheet feeder 2 includes a feeding table 20. A large number of cardboard sheets SH are stacked on the feed table 20 between the front gate 21 and the back guide 22. The front gate 21 is arranged such that the corrugated cardboard sheets SH are delivered one by one from the gap between the front gate 21 and the feeding table 20. The back guide 22 is configured to be movable relative to the front gate 21 in a direction parallel to the feeding direction FD, and configured to accommodate corrugated cardboard sheets having different sheet lengths in the feeding direction FD. The corrugated sheet feeder 2 includes a large number of feed rollers, a vertically movable grate, and a pair of feed rolls 23 and 24. When the grate descends from the multiple feed rollers, the multiple feed rollers contact the lowermost corrugated sheet SH among the multiple corrugated sheets SH to feed both the corrugated sheets SH one by one. Send to rolls 23, 24. Both feed rolls 23 and 24 feed the corrugated sheet SH one by one to the printing apparatus 3. Both feed rolls 23, 24 are coupled to and driven by the main drive motor MT. The detailed configuration of the cardboard sheet feeding device 2 will be described later.

Further, above the feeding table 20, a stack height detection sensor 195 is provided which detects the height (stacking height) of the corrugated cardboard sheets SH stacked on the feeding table 20. The stacking height detection sensor 195 is formed of a photoelectric sensor, and emits light toward the uppermost corrugated sheet SH among the corrugated sheet SH stacked on the feeding table 20, and the corrugated sheet SH The stack height is detected by receiving the reflected light.
The stacking height of the corrugated sheet SH stacked on the feeding table 20 is a parameter related (correlated) to the weight of the corrugated sheet SH stacked on the feeding table It is an example of the "seat weight related value" in the invention. In the following, an embodiment in which the stack height of the cardboard sheet SH is used as the “sheet weight related value” in the present invention will be described.

  The printing apparatus 3 includes two printing units 30 and 31. Each printing unit comprises a printing cylinder, a printing member, an ink applicator, and a press roll. The printing plate member is attached to the outer peripheral surface of the printing cylinder. The ink application device is provided with inking rolls of different colors for each printing unit. The printing apparatus 3 performs two-color printing on the corrugated cardboard sheet SH by both printing units 30 and 31 and supplies the printed corrugated cardboard sheet SH to the creaser slot 4. The printing units 30, 31 are respectively coupled to and driven by the main drive motor MT. The printing cylinders 30A, 31A of both printing units 30, 31 have the same diameter Dp. The printing plate members 30B1 and 31B1 are attached to the outer peripheral surfaces of the printing cylinders 30A and 31A, respectively. The two printing members 30B1 and 31B1 perform two-color printing on one cardboard sheet SH fed in each processing cycle.

  The creaser slot 4 includes a creaser unit 40 and two slotter units 41 and 42. The creaser unit 40 includes a pair of creased rolls disposed one above the other. Each slotter unit includes an upper slotter to which the slotter blade is attached and a lower slotter in which a groove engageable with the slotter blade is formed. The creaser 4 applies creases and grooves to the corrugated cardboard sheet SH by the creaser unit 40 and the both throttle units 41 and 42 to form a joint allowance, and supplies the corrugated cardboard sheet SH subjected to these processes to the die cutter 5 Do. The creaser unit 40 and both slotter units 41 and 42 are respectively connected to and driven by the main drive motor MT. Slotter blades 41A1 and 42A1 are attached to the outer peripheral surface of the upper slotter of both slotter units 41 and 42, respectively. The slotter blade 41A1 performs grooving processing or the like on the front end of one cardboard sheet SH fed in each processing cycle, and the slotter blade 42A1 performs grooving on the rear end part of one cardboard sheet SH Apply.

  The die cutter 5 includes a die cylinder 50 and an anvil cylinder 51 across the transport path. The punching die 52 is attached to a plate-like body such as a plywood veneer, and the plate-like body is wound around the outer peripheral surface of the die cylinder 50. The punching die 52A1 performs punching at a desired position of the corrugated sheet SH transported continuously. The punching die 52A1 can be replaced with a punching die of a punching pattern according to the order at the time of order change. The die cylinder 50 and the anvil cylinder 51 are respectively connected to and driven by the main drive motor MT. The punching die 52A1 punches and processes one corrugated sheet SH fed in each processing cycle.

  In addition, in FIG. 1, in the predetermined processing cycle in which the printing cylinders 30A and 31A of the printing apparatus 3 make one rotation, a cardboard sheet box making machine ready for the single sheet feeding mode of delivering only one corrugated sheet SH. Although the corrugated paper sheet box making machine 1 is shown in FIG. 1, it is also possible to carry out a two-sheet feeding mode in which two corrugated paper sheet SH are sequentially fed out in a predetermined processing cycle. In the case of performing the two-sheet feeding mode, in the printing apparatus 3, two printing members mounted on the outer peripheral surface of the printing cylinder 30A and two printing members mounted on the outer peripheral surface of the printing cylinder 31A are used. Well, in the case of the creaser 4, two slotter blades attached to the outer peripheral surface of the upper slotter of the slotter unit 41 and two slotter blades attached to the outer peripheral surface of the upper slotter of the slotter unit 42 may be used. The two punching dies attached to the outer peripheral surface of the die cylinder 50 may be used.

[Composition of corrugated sheet feeder]
The detailed configuration of the cardboard sheet feeding device 2 will be described with reference to FIGS. 2 to 5. 2 is a plan view showing the internal configuration of the corrugated sheet feeder 2 below the feed table 20, and FIG. 3 is a cross section of the corrugated sheet feeder 2 cut along the line A-A shown in FIG. FIG. In FIG. 2, the corrugated sheet feeder 2 includes a front frame 60, a rear frame 61, and a pair of intermediate frames 62, 63 disposed between the two frames 60, 61. The motor mounting plate 64 is fixed to the front of the front frame 60, and the bearing mounting plate 65 is fixed to the rear of the front frame 60. The motor mounting plate 66 is fixed to the rear of the rear frame 61, and the bearing mounting plate 67 is fixed to the front of the rear frame 61. The left frame 68 and the right frame 69 extend in the front-rear direction and are fixed to the two middle frames 62, 63, respectively. In FIG. 3, the lower frame 70 is fixed to the left frame 68 and the right frame 69, respectively.

  The lift motor 80 is composed of an AC servomotor and is fixed to the motor mounting plate 64. A pair of bearings 81 and 82 are respectively fixed to the bearing mounting plate 65, and rotatably support the intermediate drive shaft 83. The rotary shaft of the lift motor 80 is connected to the intermediate drive shaft 83 by a connector 84. An encoder 85 is coupled to the rotation shaft of the lift motor 80.

  The first roller motor 90 and the second roller motor 91 are composed of an AC servomotor and fixed to the motor mounting plate 64 respectively. A pair of bearings 92, 93 are respectively fixed to the bearing mounting plate 65, and rotatably support the first roller drive shaft 94. The rotating shaft of the first roller motor 90 is connected to the first roller drive shaft 94 by a connecting member 95. A pair of bearings 96, 97 are respectively fixed to the bearing mounting plate 65 and rotatably support the second roller drive shaft 98. The rotating shaft of the second roller motor 91 is connected to the second roller drive shaft 98 by a connecting member 99. The encoders 100 and 101 are connected to the rotation shaft of the first roller motor 90 and the rotation shaft of the second roller motor 91, respectively.

  The third roller motor 102 and the fourth roller motor 103 are composed of an AC servomotor and fixed to the motor mounting plate 66 respectively. A pair of bearings 104 and 105 are respectively fixed to the bearing mounting plate 67 and rotatably support the third roller drive shaft 106. The rotating shaft of the third roller motor 102 is connected to the third roller drive shaft 106 by a connecting member 107. A pair of bearings 108 and 109 are respectively fixed to the bearing mounting plate 67, and rotatably support the fourth roller drive shaft 110. The rotating shaft of the fourth roller motor 103 is connected to the fourth roller drive shaft 110 by a connecting member 111. The encoders 112 and 113 are connected to the rotation shaft of the third roller motor 102 and the rotation shaft of the fourth roller motor 103, respectively.

  In FIG. 2, first to fourth roller support shafts 120 to 123 extend in the front-rear direction in parallel with each other, and are rotatably supported by the two intermediate frames 62 and 63, respectively. A number of first feed rollers 124 are fixed to the first roller support shaft 120, and a number of second feed rollers 125 are fixed to the second roller support shaft 121. A number of third feed rollers 126 are fixed to the third roller support shaft 122, and a number of fourth feed rollers 127 are fixed to the fourth roller support shaft 123. The first to fourth feed rollers 124 to 127 are arranged in a zigzag so as not to interfere with each other. The feed rollers 124 to 127 have the same diameter Dr.

  The first roller drive shaft 94 is connected to the first roller support shaft 120 by a connector 128, and the second roller drive shaft 98 is connected to the second roller support shaft 121 by a connector 129. The third roller drive shaft 106 is connected to the third roller support shaft 122 by a connecting member 130, and the fourth roller drive shaft 110 is connected to the fourth roller support shaft 123 by a connecting member 131.

  The corrugated sheet feeder 2 includes a motion conversion mechanism 140. The motion conversion mechanism 140 is a mechanism that converts the rotation of the lift motor 80 in one direction into the lift motion of the grate 141. In FIG. 2, a number of gratings are arranged in the front-rear direction so as to cover an area in which a number of feeding rollers 124 to 127 are arranged. Only one grate 141 is shown in FIG. 2 and the other grates are not shown.

[Detailed configuration of motion conversion mechanism]
The motion conversion mechanism 140 includes a support mechanism 142 that supports the grate 141 so as to be able to move up and down, and a swing mechanism 143. The swing mechanism 143 converts rotation of the lift motor 80 in one direction into swing motion and transmits the swing motion to the support mechanism 142. In the present embodiment, one grate 141 is supported by two support mechanisms 142 disposed one behind the other as shown in FIG. Both support mechanisms have the same configuration.

  The configuration of the support mechanism 142 will be described with reference to FIG. The support mechanism 142 includes a pair of connecting blocks 150 and 151, a pair of two-arm levers 152 and 153, and a connecting rod 154. In FIG. 3, the left mounting member 155 is fixed to the right side surface of the left frame 68, and the right mounting member 156 is fixed to the left side surface of the right frame 69. The left two-arm lever 152 is pivotably attached to the left attachment member 155 by a pivot shaft 157. The right two-arm lever 153 is pivotably attached to the right attachment member 156 by a pivot shaft 158.

  In FIG. 3, the grate 141 is disposed horizontally above the four roller support shafts 120 to 123 and in proximity to these roller support shafts. A left connection block 150 is fixed to the left end of the grate 141 and extends downward. The right connection block 151 is fixed to the right end of the grate 141 and extends downward. One arm 152 A of the left two-arm lever 152 is connected to the lower end of the left connection block 150 by the connection pin 159. One arm 153 </ b> A of the right two-arm lever 153 is connected to the lower end of the right connection block 151 by the connection pin 160.

  A connecting rod 154 is disposed horizontally below the four roller support shafts 120-123. The right end of the connecting rod 154 extends to the right through a through hole 161 formed in the right frame 69. The left end of the connecting rod 154 is connected to the other arm 152 B of the left two-arm lever 152 by the connecting pin 162. The middle portion of the connecting rod 154 adjacent to the right frame 69 is connected to the other arm 153 B of the two-arm lever 153 on the right side by the connecting pin 163.

  The configuration of the swing mechanism 143 will be described with reference to FIGS. 2 to 5. The swing mechanism 143 includes a lift drive shaft 170, an eccentric member 171, a swing member 172, and a lift connecting shaft 173.

  In FIG. 2, the auxiliary frame 174 is fixed to the left side surface of the left intermediate frame 62 at predetermined intervals by a plurality of spacers 175. The elevation drive shaft 170 is rotatably supported by the auxiliary frame 174 by means of a bearing 176. The lifting drive shaft 170 is connected to the intermediate drive shaft 83 by a connecting member 177.

  FIG. 4 is a view schematically showing a connection relationship between the support mechanism 142 and the swing mechanism 143, as viewed from the left side of the auxiliary frame 174. As shown in FIG. In FIG. 4, the eccentric member 171 is fixed to the elevation drive shaft 170. The eccentric member 171 is formed in a circular shape, and has a rotational axis eccentric from the rotational axis of the elevation drive shaft 170. The swinging member 172 is fixed to the lift connecting shaft 173 and can swing around the lift connecting shaft 173. The swinging member 172 has a substantially rectangular fitting groove 178. The fitting groove 178 has a pair of contact surfaces 178A, 178B facing each other. The two contact surfaces 178A and 178B are formed extending in a direction parallel to a line connecting the center of the outer circle of the eccentric member 171 and the rotation center of the elevation connecting shaft 173. The outer peripheral surface of the eccentric member 171 always contacts both contact surfaces 178A and 178B of the fitting groove 178.

  In FIG. 2, the elevation connection shaft 173 is rotatably supported on the right side surface of the right side frame 69 by a plurality of bearings 179. The lift connecting shaft 173 is disposed in parallel with the roller support shafts 120-123. The plurality of connection members 180 are fixed to the elevating connection shaft 173 at positions respectively corresponding to the plurality of support mechanisms 142. Each connecting member 180 is connected by the connecting pin 181 to the right end of the connecting rod 154 of the corresponding support mechanism 142 as shown in FIG.

  5A to 5C show states in which the swing angle of the swinging member 172 changes as the eccentric member 171 rotates. In FIG. 5, the reference angular position RP is an angular position that coincides with a line connecting the rotation center of the eccentric member 171 and the rotation center of the elevation connecting shaft 173. The rotation center of the eccentric member 171 is also the rotation center of the elevation drive shaft 170. The angular position of the swinging member 172 shown in FIG. 5A is a position rotated clockwise from the reference angular position RP by a predetermined angle θs. In the angular position of the swinging member 172 shown in FIG. 5A, the grate 141 is positioned at the lowermost and lowest position. The angular position of the swinging member 172 shown in FIG. 5C is a position rotated counterclockwise from the reference angular position RP by a predetermined angle θs. In the angular position of the swinging member 172 shown in FIG. 5C, the grate 141 is positioned at the uppermost and uppermost position. The angular position of the swinging member 172 shown in FIG. 5 (B) is a position that matches the reference angular position RP. In the angular position of the swinging member 172 shown in FIG. 5B, the grate 141 is positioned at an intermediate position between the lowermost position and the uppermost position. In the present embodiment, the predetermined angle θs is set to an angle of 6 °. Further, in the present embodiment, when the swinging member 172 swings to the angular position shown in FIG. 5A, the right end portion of the connecting rod 154 is elastically deformed with a slight downward movement of the connecting pin 181. Configured to

[Configuration of rotational position sensor]
A rotational position sensor 190 is provided to detect a predetermined rotational position of the elevation drive shaft 170. The rotational position sensor 190 includes an optical sensor 191 and a light shield 192. The optical sensor 191 has a known configuration including a light emitting unit and a light receiving unit, and is fixed to the bearing mounting plate 65 as shown in FIG. The light shield 192 is fixed to an intermediate drive shaft 83 connected to the elevating drive shaft 170 as shown in FIG. The light blocking member 192 blocks the light from the light emitting portion of the optical sensor 191 every time the elevation drive shaft 170 reaches a predetermined rotational position.

  In FIG. 4, the optical sensor 191 and the light shield 192 are shown by a two-dot chain line. The rotational position of the light shielding body 192 shown in FIG. 4 is the rotational position immediately before the light shielding body 192 passes the optical sensor 191. In the state shown in FIG. 4, the grate 141 is located at the height before reaching the uppermost position. In the present embodiment, the rotational position sensor 190 generates a detection signal when the elevating drive shaft 170 rotates to a predetermined rotational position and the grate 141 reaches the uppermost position.

[Content of control]
Next, the control content performed in the corrugated-cardboard sheet making machine 1 by this embodiment is demonstrated. Here, the control contents according to the present embodiment will be described mainly with reference to the electrical configuration of the cardboard sheet box making machine 1 shown in FIG. FIG. 6 is a block diagram showing a basic electrical configuration of the cardboard sheet box making machine 1 according to the embodiment of the present invention.

  In order to generally control the processing of the cardboard sheet SH in the cardboard sheet making machine 1, a high-order management apparatus 200 and a low-order management apparatus 210 are provided. In the present embodiment, the upper level management device 200 stores a production control plan for executing a large number of orders in a predetermined order. The upper management device 200 sends, to the lower management device 210, control instruction information on the sheet conveyance speed, the size of the cardboard sheet SH, and the number of processed sheets for each order.

  The lower management apparatus 210 controls the operation of the drive unit such as the main drive motor MT according to the control command information sent from the upper management apparatus 200, counts the number of processed cardboard sheets SH, and sends it to the upper management apparatus 200 It is a device that performs management control of The low-order management device 210 is connected to the program memory 220 and the working memory 230, and constitutes a computer that controls the cardboard sheet box making machine 1 together with these memories. The program memory 220 is a control program for controlling the entire cardboard sheet box making machine 1, a pattern creation program for creating a grate order elevating pattern according to the sheet length of each order and the feeding mode, and predetermined set values And so on.

  Here, with reference to FIGS. 7A and 7B, the stack height determination threshold and the shift amount setting value stored in the program memory 220 in the present embodiment will be described.

  FIG. 7A shows a product height determination threshold according to the present embodiment. The stack height determination threshold is a speed control pattern (roller control pattern) for controlling the rotational speed of the roller motors 90, 91, 102, and 103 in the corrugated cardboard sheet feeding device 2, and in particular, the rotation of the feeding rollers 124 to 127 is stopped. The threshold value is used to determine the stack height of the corrugated sheet SH on the feeding table 20 of the corrugated sheet feeder 2 in order to change the speed control pattern of the acceleration area for accelerating from the state. The program memory 220 stores, as shown in FIG. 7A, a correspondence table in which a stack height determination threshold is associated with each of various flutes (such as A flute and B flute) of the cardboard sheet SH. ing. Such a stack height determination threshold indicates the speed control pattern of the acceleration region to be applied when the stack height of the corrugated cardboard sheet SH detected by the stack height detection sensor 195 becomes less than the stack height determination threshold. Used to change.

  Specifically, the program memory 220 stores a stack height determination threshold suitable for each of the plurality of flutes in the cardboard sheet SH. Basically, the stack height determination threshold is set to a smaller value for thinner flutes. In one example, the stack height determination threshold is set to 70 mm for the A flute, and the stack height determination threshold is set to 50 mm for the B flute (thinner than the A flute), and the C flute (thinner than the A flute) , And B flutes), the stack height determination threshold is set to 60 mm. The reason for making the product height determination threshold smaller as the flute is thinner as described above is as follows.

  As the stacking height of the corrugated sheet SH on the feeding table 20 decreases, the weight on the lowermost corrugated sheet SH on the feeding table 20 decreases and the frictional force applied to the corrugated sheet SH (Load) decreases. As a result, when the feeding timing from the cardboard sheet feeding device 2 is advanced, a forward shift (conveyance shift) in the feeding direction FD of the cardboard sheet SH fed by the cardboard sheet feeding device 2 occurs. As the stack height determination threshold, the stack height of the sheet pile is applied such that an unacceptable amount of the lead shift occurs with respect to such a lead shift. That is, the stack height determination threshold is used to determine that the stack height of the cardboard sheet SH on the feeding table 20 has dropped to a stack height at which an unacceptable advance deviation occurs. Here, the thinner the flute, the higher the density of the paper, so the total weight of the sheet becomes heavier than the stack height. If the weight applied to the lowermost corrugated sheet SH is the same, the thin flutes have a lower stack height than the thicker flutes. Therefore, the thinner the flute, the lower the stack height, and the lower the weight on the lowermost cardboard sheet SH, the lower the stack height when unacceptable lead deviation occurs. Therefore, as described above, the thinner the flute, the smaller the stack height determination threshold.

  Further, FIG. 7B shows the shift amount setting value according to the present embodiment. The shift amount setting value is a speed of an acceleration region that accelerates the feeding rollers 124 to 127 so as to eliminate the lead shift that occurs when the stack height of the corrugated cardboard sheet SH becomes less than the stack height determination threshold as described above. It is a set value for changing the control pattern. This set value corresponds to the degree of changing the speed control pattern in the acceleration region, and the advance deviation amount of the corrugated cardboard sheet SH (the corrugated sheet SH delivered from the corrugated sheet feeder 2 is desired position in the feeding direction FD A value according to (a length which is advanced with respect to the correct position), which is typically 5 mm or less) is applied. That is, the shift amount set value is used to cancel the amount of advance shift that would otherwise occur if the set value is not applied by changing the speed control pattern of the acceleration region by an amount according to the set value. . As shown in FIG. 7B, the program memory 220 stores a correspondence table in which shift amount setting values are associated with each of various flutes (such as A flute and B flute) of the cardboard sheet SH. There is.

Specifically, the program memory 220 stores shift amount setting values suitable for each of the plurality of flutes in the cardboard sheet SH. Basically, the shift amount setting value is set to a larger value for thinner flutes. In one example, the shift amount set value is set to 0 mm in the A flute, the shift amount set value is set to +1 mm in the B flute, and the shift amount set value is set to +1 mm in the C flute. The reason for this is as follows. The thinner the flute, the higher the density of the paper, and the heavier the total weight of the sheet relative to the stack height. Therefore, the thinner the flute, the larger the amount of change in the total sheet weight with respect to the change in stack height. The larger the amount of change in the total sheet weight, the larger the amount of advance deviation. Therefore, as described above, the thinner the flute, the larger the shift amount setting value.
The above-described shift amount setting value is a parameter corresponding to an example of the “feed adjustment amount” in the present invention.

  Returning to FIG. 6, the work memory 230 temporarily stores various information and calculation processing results sent from the upper management apparatus 200 when executing the control program, and also supplies a feeding mode designation signal from the operation panel 240, etc. Is a memory that temporarily stores

  The lower management device 210 is connected to the operation panel 240. Operation panel 240 includes a feed button 241, an order end button 242, a feed mode designation key 243, and an information display unit 244. The feeding button 241 is operated to start feeding of the cardboard sheet SH by the cardboard sheet feeding device 2. When the feed button 241 is operated, the operation panel 240 generates a feed start signal. The order end button 242 is operated to end the currently executed order. The feed mode designation key 243 is operated to designate a feed mode of either the single sheet feed mode or the double sheet feed mode. The operation panel 240 generates a feed mode designation signal indicating the designated feed mode. The information display unit 244 displays information such as numbers or symbols indicating the type of the designated feeding mode. The operation panel 240 is configured as a touch panel that can display various information by the information display unit 244 and can receive an input from the operator when the operator touches the screen. The operation panel 240 corresponds to an example of the “input device” in the present invention.

  Further, the information display unit 244 displays a setting screen for causing the operator to input the stack height determination threshold and the shift amount setting value described above. Here, with reference to FIG. 8, an example of the setting screen of the product height determination threshold and the shift amount setting value according to the embodiment of the present invention will be described. In the setting screen shown in FIG. 8, for example, the shift amount setting value and the stack height determination threshold are set for each flute of the cardboard sheet SH, for each of A flute, B flute, C flute, AB flute, E flute, and CB flute. It can be done. Specifically, when the operator touches the screen, each of the shift amount setting value and the stack height determination threshold can be set. In particular, the shift amount setting value is selected from four values of 0 mm, +1 mm, +2 mm, and +3 mm. In FIG. 8, the initial value of the shift amount setting value is shown filled. Such an initial value is changed when the operator touches the screen, that is, a shift amount setting value obtained by changing the initial value is applied. As described above, the product height determination threshold and the shift amount setting value input using the setting screen are stored in the program memory 220 and read by the lower management apparatus 210.

  In addition, basically, the program height determination threshold and shift amount setting value suitable for each of the plurality of flutes, which are obtained in advance, are stored in the program memory 220 as initial values, as described above. By using this setting screen, the operator can appropriately change the stack height determination threshold and the shift amount setting value from the initial value. As a result, since it is possible to set an appropriate stack height determination threshold value and shift amount setting value according to the operator's judgment, generation of leading deviation caused by a change in stack height of the cardboard sheet SH is effectively suppressed for various orders. become able to. The setting (modification) of the stack height determination threshold value and the shift amount set value can be performed not only before order production but also during order production.

  Further, in the order to be performed for the first time, basically, the above-described initial value is set for each of the product height determination threshold and the shift amount setting value. When the product height determination threshold value and the shift amount setting value as such initial values are changed by the operator, the changed values are stored at the end of the order. Specifically, the upper management device 200 stores the stack height determination threshold value and shift amount setting value changed in a certain order in association with the order information on the order. When this order is performed next (the second and subsequent orders), the stored product height determination threshold and the shift amount setting value are automatically set. In addition, the stored product height determination threshold and the shift amount setting value may be further updated according to the operation of the operation panel 240 by the operator. Specifically, when the operator performs a predetermined operation on the operation panel 240 during order execution, it is stored in association with order information by the stack height determination threshold value and shift amount setting value changed in this order. It is also possible to update the setting amount for the shift amount (basically, the value stored in the first order). However, when performing a different order, the initial value for the order is the same as the stack height, without using the product height determination threshold and the shift amount setting value (that is, the value obtained by changing the initial value) stored as described above. The threshold value is set for each of the threshold value and the shift amount setting value. In particular, the stack height determination threshold and the shift amount setting value are set according to the flute, but even if the flute is the same, if the order is different, the stack height determination threshold and the shift used in another order Do not apply quantity settings.

  Returning to FIG. 6, the low-order management device 210 is connected to the drive control device 250, the print control device 251, the creaser control device 252, the die cutter control device 253, and the roller motor control device 254. The drive control device 250 controls the drive and stop of the main drive motor MT and the rotation speed thereof in accordance with the control command information from the lower level management device 210. The rotational speed of the main drive motor MT is controlled in accordance with the sheet conveyance speed in the control command information. The print control device 251 controls the operation of the printing units 30 and 31 in accordance with control command information from the lower management device 210. The creaser controller 252 controls the operation of the creaser unit 40 and controls the operation of the slotter units 41 and 42 in accordance with the control command information from the subordinate manager 210. The die cutter control device 253 controls the operation of the die cutter 5 in accordance with the control command information from the lower-level management device 210.

  The rotational position sensor 190 is connected to the subordinate manager 210. The subordinate management device 210 sends control command information including a feeding start command to the roller motor control device 254 when the feeding button 241 is operated. Also, each time the subordinate management device 210 receives a feed start command, it sends control command information including a synchronization command to the roller motor control device 254 each time it receives a detection signal from the rotational position sensor 190. Further, the stacking height detection sensor 195 is connected to the lower management device 210, and a detection signal (a signal corresponding to the stacking height of the cardboard sheet SH on the feeding table 20) by the stacking height detection sensor 195 is the lower management device 210. Is input to

  As described above, the invention is not limited to the use of a different product height determination threshold for each flute, but a common product height determination threshold may be used for all flutes, and in that case, it corresponds to the product height. Instead of the product height detection sensor 195 that outputs a signal, a sensor of a specification that switches and outputs an on signal and an off signal at the set product height determination threshold may be used.

  The roller motor control device 254 controls a series of operations of the motion controller 260 in accordance with the control command information from the low-level management device 210. A pattern number setting memory 255 is connected to the roller motor controller 254, and a roller control pattern memory 261 is connected to the motion controller 260. The roller control pattern memory 261 stores a plurality of roller control patterns for controlling the rotational speed of the roller motors 90, 91, 102, 103, and the pattern number setting memory 255 applies the roller control to be applied with the shift amount setting value. A correspondence table of pattern management numbers (roller control pattern numbers) is stored.

  Here, with reference to FIGS. 9A and 9B, the roller control pattern number and the roller control pattern will be specifically described. FIG. 9A shows the roller control pattern numbers stored in the pattern number setting memory 255. As shown in FIG. 9A, the pattern number setting memory 255 stores a roller control pattern number associated with each of a plurality of shift amount setting values determined in advance. Specifically, the pattern number setting memory 255 includes four shift amount setting values of 0, 1, 2, 3 mm, and 0 to 3 roller control pattern numbers associated with these shift amount setting values, Remember the correspondence table of.

  FIG. 9B shows the roller control pattern stored in the roller control pattern memory 261. As shown in FIG. 9B, the roller control pattern memory 261 stores roller control patterns associated with each of the plurality of roller control pattern numbers. The roller control pattern is a speed control pattern for controlling the rotational speed of the roller motors 90, 91, 102, 103, and in this speed control pattern, the machine rotational angle (rotational angle of the print cylinders 30A, 31A) is used. The ratio (speed ratio) of the peripheral speed of the feed rollers 124 to 127 to the peripheral speed of the print cylinders 30A and 31A is associated with each other.

  Specifically, the roller control pattern memory 261 stores four types of roller control patterns associated with the 0 to 3 roller control pattern numbers. The roller control pattern of the roller control pattern No. 0 corresponding to the shift amount setting value 0 mm is a basic roller control pattern which is a reference of the other three types of roller control patterns. On the other hand, in the roller control pattern Nos. 1 to 3 corresponding to the shift amount setting value 1 to 3 mm, the weight change of the corrugated sheet SH stacked on the feeding table 20 (in other words, the stack height) Is a pattern in which the basic roller control pattern is changed in order to make the feeding timing constant regardless of the change in the height). As schematically shown in FIG. 9B, in the roller control pattern of the roller control pattern numbers 1 to 3, the timing at which the feeding rollers 124 to 127 start to rotate, that is, the feeding of the basic roller control pattern. The timing (acceleration start timing) for starting acceleration of the rollers 124 to 127 is delayed. Specifically, as the number of roller control pattern numbers increases, that is, as the shift amount setting value increases, the acceleration start timing of the feed rollers 124 to 127 is later. When the stacking height of the cardboard sheet SH on the feeding table 20 is lowered and the feeding timing is advanced, the acceleration start timing is delayed as described above, resulting in the result. The feeding timing at which the rear end of the lowermost corrugated sheet SH leaves the corrugated sheet feeder 2 can be made substantially the same as when the stacked height of the corrugated sheet SH is relatively high.

  Referring back to FIG. 6, when the lower management device 210 receives control command information for preparing execution of the processing order from the upper management device 200, the lower management device 210 instructs the roller motor control device 254 to prepare an order. Send control command information including. The roller motor control device 254 reads the roller control pattern number from the pattern number setting memory 255 when the control command information including the order preparation command is received from the subordinate management device 210, and transmits the roller control pattern number to the motion controller 260. send. In particular, the roller motor control device 254 calculates the product height detected by the product height detection sensor 195 and the product height determination threshold value to be applied and the shift amount setting value (value corresponding to the flute of the cardboard sheet SH currently used). The height is acquired via the lower management device 210, and if the stack height is equal to or higher than the stack height determination threshold, the 0th is sent to the motion controller 260 as a roller control pattern number, and the stack height is determined as the stack height. If it is less than the threshold value, the roller control pattern number (any one of 1 to 3) corresponding to the shift amount setting value is sent to the motion controller 260. Further, the roller motor control device 254 sends a motion activation command to the motion controller 260 in accordance with the feeding start command or the synchronization command in the control command information from the lower level management device 210.

  The motion controller 260 incorporates a motion CPU and is connected to the program memory 262. The program memory 262 stores in advance a pattern creation program for creating a speed control command. The motion controller 260 reads the roller control pattern corresponding to the roller control pattern number sent from the roller motor control device 254 with reference to the roller control pattern memory 261. Then, the motion controller 260 creates a speed control command based on the sheet conveyance speed sent from the lower management device 210 and the read roller control pattern, using the pattern creation program stored in the program memory 262. It sends to the drive control circuit 264. For example, the speed control command is a command including a pattern corresponding to a time change of the rotational speed applied to the roller motors 90, 91, 102, 103. The motion controller 260 sends a speed control command to the drive control circuit 264 when receiving a motion start command from the roller motor controller 254. The basic configuration of the motion controller 260 is disclosed in, for example, JP-A-2006-72399, JP-A-11-272312, and JP-A-5-50329, and is generally known. I omit it.

  The drive control circuit 264 receives the speed control command from the motion controller 260 and the rotation pulse from the encoder group 100, 101, 112, 113, and the rotation speed of the roller motor 90, 91, 102, 103, its rotation and Control the stop and. That is, the drive control circuit 264 controls the power supplied to each roller motor so that the rotational speed of each roller motor becomes a rotational speed according to the speed control command during a predetermined control cycle. Due to the rotation of the roller motors 90, 91, 102, and 103, the feed rollers 124 to 127 in FIG. 3 rotate counterclockwise as indicated by arrows. In the present embodiment, each encoder has a configuration capable of generating a large number of rotation pulses, for example, a number of pulses of 1000 pulses / msec or more during a predetermined control period.

  The low order management device 210, the roller motor control device 254, the motion controller 260, and the drive control circuit 264 correspond to an example of the "control device" in the present invention.

  Next, the grate basic lift pattern memory 270 and the grate order lift pattern memory 271 are connected to the lower management device 210, respectively. The grate basic lift pattern memory 270 controls the rotational speed of the lift motor 80 according to the minimum sheet length for the single sheet feed mode, and the grate basic lift pattern and the single sheet feed mode. For the 2nd sheet feeding mode, the 2nd sheet feeding mode, the 2nd sheet feeding mode and the 2nd sheet feeding mode, which are predetermined according to the minimum sheet length for the 2-sheet feeding mode. And store the basic basic lift pattern, which is predetermined according to the maximum sheet length. The grate order lift pattern memory 271 temporarily stores the grate order lift pattern.

  The lower-level management device 210 executes the pattern creation program stored in the program memory 220 when receiving the control command information for preparing execution of the machining order from the higher-level management device 200. By execution of the pattern creation program, the lower management apparatus 210 determines the sheet length of the processing order based on the grate basic lift pattern of any of the above four grate basic lift patterns stored in the grate basic lift pattern memory 270. A grate order elevating pattern according to is created and temporarily stored in the gratorder elevating pattern memory 271. Thereafter, the low-order management device 210 reads the grate order elevating pattern from the grate order elevating pattern memory 271 and generates a pattern creation command. The pattern creation command includes the sheet transport speed in the control command information from the upper level management device 200 and the grate order elevating pattern.

  The lower management apparatus 210 receives a feed start signal from the operation panel 240 when the feed button 241 is operated, and sends control command information including a feed start command to the motion controller 280 as a motion start command. Also, each time the lower-level management device 210 receives a feed start command, it sends control command information including a synchronization command to the motion controller 280 as a motion start command each time it receives a detection signal from the rotational position sensor 190.

  A motion controller 280 is connected to the subordinate manager 210. The motion controller 280 incorporates a motion CPU, and is connected to a program memory 281 storing a program, and a great speed control pattern memory 282. The program memory 281 stores in advance a pattern creation program for creating a great lifting speed control pattern. The great speed control pattern memory 282 temporarily stores the great lifting speed control pattern created by the motion controller 280. The great lift speed control pattern includes a series of multiple speed control commands to command the rotational speed of the lift motor 80. The motion controller 280 executes the pattern creation program when receiving the pattern creation command from the lower-level management device 210. By executing the pattern creation program, the motion controller 280 creates a grate elevating speed control pattern based on the sheet conveyance speed and the grate order elevating pattern in the pattern creation command, and temporarily stores it in the grate speed control pattern memory 282.

  The motion controller 280 reads out each speed control command from the control pattern memory 282 every predetermined control cycle when receiving a motion start command from the lower level management device 210, and sends it to the drive control circuit 283. Even if the predetermined control cycle is 1 msec, for example, and the sheet conveying speed is set to the highest sheet conveying speed in the corrugated sheet making machine 1, the motion controller 280 ensures processing such as reading of the speed control command. It is a period that can be implemented. The basic configuration of the motion controller 280 is the same as that of the motion controller 260.

  The drive control circuit 283 receives the speed control command from the motion controller 280 and the rotation pulse from the encoder 85, and controls the rotation speed of the lift motor 80 and its rotation and stop. That is, the drive control circuit 283 controls the power supplied to the lift motor 80 such that the rotation speed of the lift motor 80 becomes the rotation speed according to the speed control command during a predetermined control cycle. While the rotary shaft of the lift motor 80 rotates once, the eccentric member 171 rotates clockwise as shown by the arrows in FIGS. 4 and 5, and the grate 141 performs one lift movement. In the present embodiment, the encoder 85 has a configuration capable of generating a large number of rotation pulses, for example, a number of pulses of 1000 pulses / msec or more during a predetermined control period.

[Roller control pattern]
Next, the roller control pattern applied in the embodiment of the present invention will be specifically described. As described above, the roller control pattern is stored in the roller control pattern memory 261 (see FIGS. 6 and 9B).

  FIG. 10 is an explanatory view of a basic roller control pattern which is a first example of the roller control pattern according to the embodiment of the present invention. In FIG. 10, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The basic roller control pattern is a reference speed control pattern that is applied when the stack height of the cardboard sheet SH on the feeding table 20 is equal to or greater than the stack height determination threshold. Specifically, this basic roller control pattern is applied when the roller control pattern number is 0 and the shift amount setting value is 0 mm.

  First, the basic configuration of the roller control pattern common to various roller control patterns will be described. As shown in FIG. 10, in the speed control pattern P1 as the roller control pattern, the feed rollers 124 to 127 are stopped from rotating. An acceleration region R11 for acceleration, a constant velocity region R12 for rotating the feed rollers 124 to 127 at a constant speed after the acceleration region R11, and a feed roller 124 to 127 after the constant velocity region R12 And a stop area R14 for stopping the rotation of the feeding rollers 124 to 127 after the speed reduction area R13. In the basic roller control pattern shown in FIG. 10, the acceleration region R11 is in the range of 0 ° to 65 °, the constant velocity region R12 is in the range of 65 ° to 196 °, and the deceleration region R13 is 196 ° to 226 °. It is a range, and stop area R14 is a range of 226 degrees-360 degrees.

  Next, FIG. 11 is an explanatory view of a second example of the roller control pattern according to the embodiment of the present invention. Also in FIG. 11, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 with respect to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The roller control pattern according to the second example is applied when the stack height of the cardboard sheet SH on the feeding table 20 is less than the stack height determination threshold, and the basic roller control pattern described above (first Of the roller control pattern according to the example of FIG. Specifically, the roller control pattern according to the second example is applied when the roller control pattern number is No. 3 and the shift amount setting value is +3 mm.

  As shown in FIG. 11, in the roller control pattern according to the second example, the acceleration region R11a (indicated by a solid line) is generally on the right with respect to the acceleration region R11 (indicated by a broken line) of the basic roller control pattern. It is shifting. Specifically, in the roller control pattern according to the second example, the start position of the acceleration region R11a is a rotation angle of 0.86 °, which is the start position of the acceleration region R11 in the basic roller control pattern. The angle is larger than 0 °. In addition, in the roller control pattern according to the second example, the end position of the acceleration region R11a is a rotation angle of 65.86 °, which is the end position of the acceleration region R11 in the basic roller control pattern. The angle is larger than 65 °. The roller control pattern according to the second example is the same as the basic roller control pattern except for the acceleration area.

  According to the roller control pattern of the second example, since the acceleration region R11a of the speed control pattern P1 starts from a relatively large rotation angle, the acceleration start timing of the cardboard sheet SH is delayed. On the other hand, although the roller control pattern according to the second example is applied in a situation where the stack height of the cardboard sheet SH on the feed table 20 is less than the stack height determination threshold, the feed table 20 in that situation. As the weight applied to the upper lowermost corrugated sheet SH decreases and the frictional force applied to the corrugated sheet SH decreases, the feeding timing from the corrugated sheet feeder 2 tends to be advanced. Therefore, in such a situation, by applying the roller control pattern according to the second example in which the basic roller control pattern is changed as described above, control is performed to delay the acceleration start timing of the cardboard sheet SH. In this way, it is possible to prevent the feeding timing from the corrugated cardboard sheet feeding device 2 from becoming premature. That is, it is possible to offset the advance of the feeding timing by reducing the frictional force applied to the lowermost corrugated sheet SH, by delaying the acceleration start timing of the corrugated sheet SH. Therefore, when the stacking height of the cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold, substantially the same feeding timing as when the stacking height is the stacking height determination threshold or more can be realized. become. Therefore, the advance shift resulting from the change of the weight of the corrugated sheet SH stacked on the feeding table 20 can be appropriately suppressed.

  Note that the rotation angle is based on the start position of the acceleration region R11a in order to appropriately eliminate the advance deviation (corresponding to the shift amount set value, +1 mm, +2 mm, +3 mm described above) by delaying the acceleration start timing. The amount (angle) to be increased from 0 ° can basically be uniquely determined from the diameter Dp of the printing cylinders 30A, 31A and the like. Therefore, for each of +1 mm, +2 mm and +3 mm as the shift amount setting value, an amount to increase the start position of the acceleration region R11a from the rotation angle 0 ° is obtained in advance, and roller control is performed for each of these shift amount set values. Patterns can be defined. Basically, the amount by which the start position of the acceleration region R11a should be increased from the rotation angle 0 ° becomes larger as the set value of the shift amount becomes larger. As described above, when the shift amount setting value is +3 mm, the rotation angle at the start position of the acceleration region is 0.86 °, but when the shift amount setting value is +1 mm, the start of the acceleration region When the rotation angle at the position is 0.28 ° and the shift amount setting value is +2 mm, the rotation angle at the start position of the acceleration region is 0.57 °. The amount by which the start position of the acceleration region is shifted from the rotation angle of 0 ° according to such a shift amount setting value corresponds to an example of the “feed adjustment amount” in the present invention.

  On the other hand, when the acceleration start timing of the feeding rollers 124 to 127 of the cardboard sheet feeding device 2 is delayed by applying the roller control pattern according to the second example as described above, the grate of the cardboard sheet feeding device 2 There is no need to change the operation of 141 from the normal time. This will be described with reference to FIG.

  FIG. 12 is an explanatory view of the operation of the grate 141 when the second example of the roller control pattern according to the embodiment of the present invention is applied. 12, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feed rollers 124 to 127 to the peripheral speed of the printing cylinders 30A and 31A. And the height of the grating 141, and shows the roller control pattern according to the second example and the operation of the grating 141 in an overlapping manner. More specifically, in FIG. 12, the position where the speed ratio is 100% is shown as the height (reference height) of the grate 141 at which the feeding rollers 124 to 127 and the cardboard sheet SH are in contact.

As in the roller control pattern according to the second example, when the start position of the acceleration region R11a is shifted to the right, the rotation start timing of the feed rollers 124 to 127 is delayed, and the corrugated sheet SH is fed by the feed rollers 124 to 127. Although the distance is shortened, no particular problem occurs. This is after applying the maximum +3 mm as the shift amount setting value and shifting the start position of the acceleration region R11a to the far right, even after the leading edge of the cardboard sheet SH reaches the feed rolls 23 and 24 ( In FIG. 12, the rotation angle θ ₁ indicates the timing when the leading edge of the cardboard sheet SH reaches the feed rolls 23 and 24), and the contact between the feeding rollers 124 to 127 and the cardboard sheet SH by the grate 141 is blocked. It is. In this case, the corrugated cardboard sheet SH can be reliably delivered to the feed rolls 23 and 24.

  On the other hand, the stack height detected by the stack height detection sensor 195 is higher than the stack height determination threshold while the single cardboard sheet SH is being fed by the cardboard sheet feeding device 2. Although the state may be changed to be less than the determination threshold, in this case, the roller control pattern applied to send out the cardboard sheet SH is not changed. This will be described with reference to FIG.

  FIG. 13 is an explanatory view of the change timing of the roller control pattern according to the embodiment of the present invention. FIG. 13 shows, on the upper side, the time change of the stack height detected by the stack height detection sensor 195, and on the lower side, the speed of the peripheral speed of the feed rollers 124 to 127 with respect to the peripheral speed of the printing cylinders 30A and 31A. It shows the time change of the ratio. The lower diagram shows the applied roller control pattern.

  In FIG. 13, in the first cycle cy1, since the product height detected by the product height detection sensor 195 is equal to or greater than the product height determination threshold, a basic roller control pattern as indicated by a symbol P10 is applied. Then, during the cycle cy2 after this cycle cy1 (time t1), the product height changes from the product height determination threshold or more to the product height determination threshold or less in this embodiment, but in the cycle cy2 The basic roller control pattern P10 is continuously applied. In this case, the roller motor control device 254 changes the roller control pattern number sent to the motion controller 260 from number 0 to any number from 1 to 3 at time t1, but the motion controller 260 changes the cycle cy2. The basic roller control pattern P10 corresponding to the No. 0 roller control pattern number received from the roller motor control device 254 at the start is continuously applied in the cycle cy2. In this way, the roller control pattern applied in the middle of the cycle is changed to prevent the roller motors 90, 91, 102, and 103 from being overloaded. Then, the motion controller 260 applies the roller control pattern P11 corresponding to the roller control pattern number of any one of numbers 1 to 3 received from the roller motor control device 254 from the time t1 in the cycle cy3 following the cycle cy2. To do. That is, in the cycle cy3, the motion controller 260 changes the applied roller control pattern from the basic roller control pattern P10 to the roller control pattern P11. As described above, in this embodiment, the roller control pattern to be applied is changed in one cycle cycle.

[Function effect]
Next, the operation and effects of the cardboard sheet feeding device 2 according to the embodiment of the present invention will be described.

  As described above, when the corrugated cardboard sheet SH stacked on the feeding table 20 is continuously fed by the corrugated cardboard sheet feeding device 2, the weight of the corrugated cardboard sheet SH stacked on the feeding table 20 is small. And the timing at which the corrugated sheet SH is fed by the corrugated sheet feeder 2 tends to change due to the reduction of the frictional force (load) applied to the lowermost corrugated sheet SH. There is a tendency for the delivery timing to be advanced. As a result, the position in the conveyance direction of the corrugated cardboard sheet SH delivered by the corrugated cardboard sheet feeding device 2 is not constant. That is, with respect to the corrugated cardboard sheet SH fed by the corrugated cardboard sheet feeding device 2, positional deviation (conveyance deviation) in the conveying direction occurs. Specifically, when the weight of the corrugated cardboard sheet SH on the feeding table 20 decreases, the feeding timing is advanced compared to when the weight of the corrugated cardboard sheet SH on the feeding table 20 is large, so the corrugated cardboard sheet SH is conveyed. A relatively advanced state (advance shift) occurs in the direction.

  Therefore, in the present embodiment, the feeding table 20 is set such that the feeding timing becomes constant regardless of the change in weight of the cardboard sheet SH on the feeding table 20 while performing one-order production. The speed control pattern (roller control pattern) of the acceleration region is changed based on the stack height of the cardboard sheet SH on the feeding table 20 corresponding to the weight of the upper cardboard sheet SH. Thereby, the conveyance shift (advance shift) of the corrugated sheet SH caused by the change of the weight of the corrugated sheet SH on the feeding table 20 as described above can be appropriately suppressed.

  In particular, in the present embodiment, by changing the timing at which acceleration of the cardboard sheet SH is started, the feeding timing can be appropriately maintained constant regardless of the change in the weight of the cardboard sheet SH on the feeding table 20. It will be. In addition, since the acceleration start timing is changed while maintaining the same magnitude of acceleration, it is possible to suppress the slip of the cardboard sheet SH on the feeding rollers 124 to 127. That is, when the acceleration is increased, the corrugated cardboard sheet SH is likely to slip on the feeding rollers 124 to 127, but such slip can be suppressed by maintaining the magnitude of the acceleration the same. Therefore, stable delivery by the corrugated sheet feeder 2 can be secured.

  Further, in the present embodiment, when the weight of the corrugated cardboard sheet SH on the feeding table 20 is reduced, the feeding timing is advanced, so that the stacking height related to the weight of the corrugated cardboard sheet SH on the feeding table 20 is determined. When the product height is less than the product height determination threshold using the threshold (the product height determination threshold), the timing at which acceleration of the cardboard sheet SH is started is higher than when the product height is the product height determination threshold or more. Delay. As a result, regardless of the change in weight of the cardboard sheet SH on the feeding table 20, the feeding timing can be effectively maintained constant.

  Here, in the thin fluted corrugated cardboard sheet SH, because the density of the corrugated cardboard sheet SH is higher than that of the thick fluted corrugated cardboard sheet SH, the weight of the corrugated cardboard sheet SH on the feeding table 20 is reduced. The timing for advancing the feed timing tends to be relatively late. Therefore, in the present embodiment, as the flutes of the cardboard sheet SH are thinner, the stack height determination threshold is reduced. As a result, since the stack height determination threshold is set according to the flutes of the cardboard sheet SH, the occurrence of conveyance deviation can be appropriately prevented for the cardboard sheets SH of various flutes.

  Further, in the present embodiment, in the middle of one cycle period in which one corrugated cardboard sheet SH is sent out, the state where the stack height is equal to or greater than the stack height determination threshold changes to a state that is less than the stack height determination threshold. Even in this case, the speed control pattern applied in this cycle period is not changed. As a result, it is possible to prevent an excessive load from being applied to the roller motors 90, 91, 102, and 103 that rotationally drive the feed rollers 124 to 127.

  Further, in the present embodiment, the degree to which the feeding timing changes (specifically, the degree to which the feeding timing is advanced) changes according to the weight of the cardboard sheet SH on the feeding table 20. Thus, the amount (that is, the shift amount setting value) to delay the timing of starting the acceleration of the cardboard sheet SH is changed. As a result, regardless of the change in weight of the cardboard sheet SH on the feeding table 20, the feeding timing can be effectively maintained constant.

  Here, in the thin fluted corrugated cardboard sheet SH, since the density of the corrugated cardboard sheet SH is higher than that of the thick fluted corrugated cardboard sheet SH, the feeding operation of the corrugated cardboard sheet SH proceeds on the feeding table 20 The amount of change in weight of the cardboard sheet SH becomes large, and the degree of advancing of the feeding timing becomes large. Therefore, in the present embodiment, as the flute of the cardboard sheet SH is thinner, the shift amount setting value is increased. As a result, since the shift amount setting value is set in accordance with the flutes of the cardboard sheet SH, it is possible to appropriately prevent the occurrence of conveyance deviation for the cardboard sheets SH of various flutes.

  Further, in the present embodiment, the speed control pattern according to the shift amount setting value can be rapidly applied by storing in advance a plurality of speed control patterns (roller control patterns) according to the shift amount setting value. As a result, the operator can easily grasp the speed control pattern actually used.

  Further, in the present embodiment, the operator uses the operation panel 240 (specifically, using the setting screen displayed on the information display unit 244) to set the stack height determination threshold and the shift amount setting value in accordance with the order specification. Can be changed as appropriate. Thus, various order specifications can be appropriately coped with.

  Further, in the present embodiment, the product height determination threshold and the shift amount setting value used in the past order can be automatically applied when an order having the same specifications as the order is subsequently performed. As a result, it is possible to save the worker the trouble of changing the stack height determination threshold and the shift amount setting value each time.

  Further, in the present embodiment, the weight of the cardboard sheet SH on the feeding table 20 is not used, but the stacking height of the cardboard sheet SH uniquely indicating the weight of the cardboard sheet SH on the feeding table 20 is used. . As a result, control of the corrugated sheet feeder 2 can be appropriately performed without using the weight of the corrugated sheet SH which is relatively difficult to detect and the like. Further, by using the stack height detection sensor 195, the stack height of the corrugated sheet SH can be detected easily and accurately.

[Modification]
Next, modifications of the above-described embodiment will be described. In addition, the some modification shown below can be implemented combining with each other suitably.

(Modification 1)
In the embodiment described above, the timing (acceleration start timing) to start acceleration of the corrugated sheet SH is changed based on the stack height of the corrugated sheet SH on the feeding table 20, but in the modification, the acceleration start timing Instead of changing the magnitude of acceleration when accelerating the corrugated sheet SH. Also in such a modification, a plurality of roller control patterns for changing the magnitude of the acceleration applied to the cardboard sheet SH with respect to each of the above-described shift amount setting values (0, +1, +2, +3 mm) (FIG. 10) Four types of roller control patterns including the basic roller control pattern shown in FIG.

  FIG. 14 is an explanatory view of a third example of the roller control pattern, which is a modified example of the embodiment of the present invention. In FIG. 14, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 with respect to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The roller control pattern according to the third example shown in FIG. 14 is applied when the stack height of the cardboard sheet SH on the feeding table 20 is less than the stack height determination threshold, and the shift amount setting value is +3 mm. Applied at a certain time (roller control pattern number is 3).

  As shown in FIG. 14, in the roller control pattern according to the third example, the inclination of the acceleration area R11b (indicated by a solid line) is greater than the inclination (indicated by a broken line) of the acceleration area R11 of the basic roller control pattern (see FIG. 10). Is also loose. That is, the acceleration of the acceleration region R11b is smaller than the acceleration of the acceleration region R11. Specifically, in the roller control pattern according to the third example, the start position of the acceleration region R11b is the rotation angle 0 °, and this rotation angle is the same as the start position of the acceleration region R11 of the basic roller control pattern (that is, acceleration The start timing has not changed). However, the end position of the acceleration region R11b is the rotation angle 66.69 °, and this rotation angle is larger than the rotation angle 65 ° which is the end position of the acceleration region R11 of the basic roller control pattern (that is, the acceleration end Timing is late). Here, an example in which the shift amount setting value is +3 mm is shown, but when the shift amount setting value is +2 mm, the rotation angle at the end position of the acceleration region is 66.17 °, and the shift is If the quantity setting is +1 mm, the rotation angle at the end of the acceleration zone is 65.56 °. The amount by which the rotational angle at the end position of the acceleration region is shifted according to such a shift amount setting value (the amount shifted from 65 °) corresponds to an example of the “feed adjustment amount” in the present invention.

  According to the roller control pattern according to the third example of such a modification, the acceleration applied when accelerating the cardboard sheet SH from the rotation stop state is reduced. On the other hand, although the roller control pattern according to the third example is applied in a situation where the stack height of the cardboard sheet SH on the feed table 20 is less than the stack height determination threshold, the feed table 20 in that situation. As the weight applied to the upper lowermost corrugated sheet SH decreases and the frictional force applied to the corrugated sheet SH decreases, the feeding timing from the corrugated sheet feeder 2 tends to be advanced. Therefore, in such a situation, the roller control pattern according to the third example in which the basic roller control pattern is changed as described above is applied to perform control to reduce the acceleration when accelerating the corrugated sheet SH. As a result, it is possible to prevent the feeding timing from the corrugated sheet feeder 2 from becoming premature. That is, by reducing the frictional force applied to the lowermost corrugated sheet SH, the acceleration when accelerating the corrugated sheet SH is reduced, and the lower corrugated sheet SH is fed to the lowermost corrugated sheet SH by the feed rollers 124 to 127. By reducing the force (conveying force) to be applied in the feeding direction FD, it is possible to eliminate the advance of the feeding timing by reducing the frictional force applied to the lowermost cardboard sheet SH. Therefore, when the stacking height of the cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold, substantially the same feeding timing as when the stacking height is the stacking height determination threshold or more can be realized. become. Therefore, the advance shift resulting from the change of the weight of the corrugated sheet SH stacked on the feeding table 20 can be appropriately suppressed.

  Further, in the present modification, the magnitude of the acceleration is changed while maintaining the same acceleration start timing, so that the lowermost cardboard sheet SH falls onto the feed rollers 124 to 127 in the middle of acceleration and slips. Can be suppressed. That is, when the acceleration start timing is advanced, acceleration of the feeding rollers 124 to 127 starts before the lowermost corrugated sheet SH contacts the feeding rollers 124 to 127, and the lowermost corrugated sheet SH is fed to the feeding roller 124. There is a possibility of slipping when contacting ~ 127, but if the acceleration start timing is maintained the same, the timing when the lowermost cardboard sheet SH contacts the feeding rollers 124 to 127 and the acceleration of the feeding rollers 124 to 127 Such slippage can be suppressed because the difference between the timing of the start of the rotation and the start of the rotation is kept constant. Therefore, stable delivery by the corrugated sheet feeder 2 can be secured.

  In the above-described embodiment, the amount by which the rotational angle at the end position of the acceleration region is shifted from the rotational angle 65 ° based on the reference is used as the “feed adjustment amount”. (The ratio of the inclination of the straight line in the acceleration region) may be used as the “feed adjustment amount”. For example, when the shift amount setting value is 0 mm, the inclination of the straight line in the acceleration region is about 1.538 (≒ 100/65), and when the shift amount setting value is +1 mm, the inclination of the straight line in the acceleration region is When the shift amount setting value is +2 mm, the slope of the straight line in the acceleration region is about 1.511 (≒ 100 / 66.17), and the shift amount setting value is about 1.525 (≒ 100 / 65.56). In the case of +3 m, the slope of the straight line in the acceleration region is approximately 1.499 (100 / 66.69). In this case, based on the slope of the straight line in the acceleration region when the shift amount setting value is 0 mm, the ratio of the slope of the straight line in the acceleration region when the shift amount setting value is +1 mm is about 0.99 (≒ 1 The ratio of the slope of the straight line in the acceleration region when the shift amount setting value is +2 mm is approximately 0.98 (≒ 1.511 / 1.538), and the shift amount setting value is +3 mm. The ratio of the slopes of the straight lines in the acceleration region in this case is approximately 0.97 (≒ 1.499 / 1.538). The ratio of the inclination of the straight line in such an acceleration region can be used as the "feed adjustment amount".

  Further, in the above-described embodiment, only the acceleration start timing of the cardboard sheet SH is changed, and in the present modification, only the magnitude of acceleration when accelerating the cardboard sheet SH is changed, In a further modification, both the change of the acceleration start timing of the cardboard sheet SH and the change of the magnitude of the acceleration of the cardboard sheet SH may be performed. That is, the timing of starting acceleration of the cardboard sheet SH may be delayed, and the magnitude of acceleration when accelerating the cardboard sheet SH may be reduced.

(Modification 2)
Although the above-described embodiment applies the present invention to the one-sheet feeding mode, in a modification, the present invention may be applied to the two-sheet feeding mode. That is, the present invention is not limited to the application to the one-sheet feeding mode, but is also applicable to the two-sheet feeding mode.

  First, the basic roller control pattern applied in the two-sheet feeding mode will be described with reference to FIG. FIG. 15 is an explanatory view of a basic roller control pattern which is a fourth example of the roller control pattern according to the modification of the embodiment of the present invention. In FIG. 15, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The basic roller control pattern is a reference speed control pattern that is applied when the stack height of the cardboard sheet SH on the feed table 20 is equal to or greater than the stack height determination threshold in the two-sheet feeding mode. Specifically, this basic roller control pattern is applied when the shift amount setting value is 0 mm.

  First, the basic configuration of the roller control pattern applied in the two-sheet feeding mode will be described. As shown in FIG. 15, the roller control pattern includes two corrugated cardboard sheets delivered during one rotation of the printing cylinders 30A and 31A. Speed control pattern P3 to be applied to the preceding sheet (odd-numbered corrugated sheet SH) of SH, and the sheet (following corrugated sheet) of the two corrugated sheets SH And a speed control pattern P4 to be applied to the sheet SH). The speed control patterns P3 and P4 respectively have acceleration regions R31 and R41 for accelerating the feed rollers 124 to 127 from the rotation stop state, and the feed rollers 124 to 124 after the acceleration regions R31 and R41. 127, constant speed areas R32 and R42 for rotating at a constant speed, deceleration areas R33 and R43 for decelerating the rotation of the feed rollers 124 to 127 after the constant speed areas R32 and R42, and the deceleration areas And stop areas R34 and R44 for stopping the rotation of the feed rollers 124 to 127 after R33 and R43.

  In the basic roller control pattern shown in FIG. 15, in the speed control pattern P3 of the odd-numbered corrugated sheet SH, the acceleration area R31 is in the range of 0 ° to 65 °, and the constant speed area R32 is 65 ° to 140 °. The deceleration range R33 is in the range of 140 ° to 170 °, and the stop range R34 is in the range of 170 ° to 180 °. In addition, in the speed control pattern P4 of the even-numbered corrugated sheet SH, the acceleration region R41 is in the range of 180 ° to 245 °, the constant velocity region R42 is in the range of 245 ° to 320 °, and the deceleration region R43 is It is in the range of 320 ° to 350 °, and the stop region R44 is in the range of 350 ° to 360 °.

  FIG. 16 is an explanatory view of a fifth example of a roller control pattern, which is a modified example of the embodiment of the present invention. Also in FIG. 16, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The roller control pattern according to the fifth example is applied when the stacking height of the cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold in the two-sheet feeding mode, as described above. It is the speed control pattern which changed the basic roller control pattern (the roller control pattern by the 4th example). Specifically, the roller control pattern according to the fifth example is applied when the shift amount setting value is +3 mm.

  As shown in FIG. 16, in the roller control pattern according to the fifth example, both of the speed control pattern P3 for the odd-numbered corrugated sheet SH and the speed control pattern P4 for the even-numbered corrugated sheet SH The acceleration regions R31a and R41a (indicated by solid lines) are generally shifted to the right with respect to the acceleration regions R31 and R41 (indicated by broken lines) of the basic roller control pattern. Specifically, in the roller control pattern according to the fifth example, in the speed control pattern P3 for the odd-numbered corrugated cardboard sheet SH, the start position of the acceleration region R31a is the rotation angle of 0.86 °, and this rotation angle Is larger than the rotation angle 0 ° which is the start position of the acceleration region R31 in the basic roller control pattern, and the end position of the acceleration region R31a is the rotation angle 65.86 °, which is The rotation angle is larger than 65 ° which is the end position of the acceleration region R31 in the basic roller control pattern. Further, in the speed control pattern P4 for the even-numbered corrugated cardboard sheet SH, the start position of the acceleration area R41a is 180.86 ° in rotation angle, which is the angle of rotation of the acceleration area R41 in the basic roller control pattern. The rotation angle is 180 °, which is the start position, and the end position of acceleration region R41a is the rotation angle of 245.86 °. This rotation angle is the end of acceleration region R41 in the basic roller control pattern. It is larger than the rotation angle of 245 ° which is the position.

  According to the roller control pattern according to the fifth example described above, since the acceleration regions R31a and R41a of the speed control patterns P3 and P4 start from a relatively large rotation angle in the two-sheet feeding mode, the odd-numbered corrugated sheet SH The acceleration start timing is delayed for both and even cardboard sheets SH. As described above, the control for delaying the acceleration start timing of the cardboard sheet SH is performed in a situation in which the stacking height of the cardboard sheet SH is less than the stack height determination threshold and the feeding timing tends to be advanced. As a result, it is possible to prevent the feeding timing from the corrugated cardboard sheet feeding device 2 from being advanced. Therefore, according to the fifth example, with respect to both the odd-numbered sheet and the even-numbered corrugated sheet SH being fed in the two-sheet feeding mode, the change in weight of the corrugated sheet SH stacked on the feeding table 20 is It is possible to appropriately suppress the leading deviation due to it.

  Next, an example in which the present modification is further modified will be described with reference to FIG. The example shown in FIG. 17 corresponds to the above-described “Modification 1”. Specifically, FIG. 17 is an explanatory view of a sixth example of a roller control pattern, which is a modified example of the embodiment of the present invention. Also in FIG. 17, the horizontal axis indicates the rotation angle (°) of the printing cylinders 30A and 31A, and the vertical axis indicates the speed ratio (%) of the peripheral speed of the feeding rollers 124 to 127 with respect to the peripheral speed of the printing cylinders 30A and 31A. Is shown. The roller control pattern according to the sixth example is applied when the stacking height of the cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold in the two-sheet feeding mode, as described above. It is the speed control pattern which changed the basic roller control pattern (the roller control pattern by the 4th example). Specifically, the roller control pattern according to the sixth example is applied when the shift amount setting value is +3 mm.

  As shown in FIG. 17, in the roller control pattern according to the sixth example, both of the speed control pattern P3 for the odd-numbered corrugated sheet SH and the speed control pattern P4 for the even-numbered corrugated sheet SH The inclinations of the acceleration regions R31b and R41b (indicated by solid lines) are gentler than the inclinations of the acceleration regions R31 and R41 of the basic roller control pattern (indicated by broken lines). Specifically, in the roller control pattern according to the sixth example, in the speed control pattern P3 for the odd-numbered corrugated cardboard sheet SH, the start position of the acceleration region R31b is a rotation angle of 0 °, and this rotation angle is the basic roller It is the same as the start position of acceleration area R31 of the control pattern, but the end position of acceleration area R31b is the rotation angle 66.69 °, which is the end position of acceleration area R31 of the basic roller control pattern The angle is larger than 65 °. Further, in the speed control pattern P4 for the even-numbered corrugated cardboard sheet SH, the start position of the acceleration region R41b is the rotation angle 180 °, and this rotation angle is the same as the start position of the acceleration region R41 of the basic roller control pattern. However, the end position of the acceleration region R41b is the rotation angle 246.69 °, and this rotation angle is larger than the rotation angle 245 ° which is the end position of the acceleration region R41 of the basic roller control pattern.

  According to the roller control pattern of the sixth example described above, both the odd-numbered corrugated cardboard sheet SH and the even-numbered corrugated cardboard sheet SH are applied when accelerating from the rotation stop state in the two-sheet feeding mode. Acceleration decreases. As a result, the control for reducing the acceleration of the corrugated cardboard sheet SH is performed in a situation where the stacking height of the corrugated cardboard sheet SH is less than the stacked height determination threshold and the feeding timing tends to be advanced. In addition, it is possible to prevent the feeding timing from the cardboard sheet feeding device 2 from being advanced. Therefore, according to the sixth example, with respect to both the odd-numbered sheet and the even-numbered corrugated sheet SH being fed in the two-sheet feeding mode, the change in weight of the corrugated sheet SH stacked on the feeding table 20 is It is possible to appropriately suppress the leading deviation due to it.

(Modification 3)
In the embodiment described above, the stack height determination threshold and the shift amount setting value are set according to the flute of the cardboard sheet SH, but in the modification, the dimensions of the cardboard sheet SH (hereinafter simply referred to as "sheet dimensions") The product height determination threshold and the shift amount setting value may be set according to. In particular, it is preferable to set the stack height determination threshold and the shift amount setting value in accordance with both the flute and the sheet size of the cardboard sheet SH. The flute and sheet dimensions are an example of the "specification" of the cardboard sheet SH.

  With reference to FIGS. 18A and 18B, the product height determination threshold and the shift amount setting value according to the modification of the embodiment of the present invention will be described. FIG. 18A schematically shows a correspondence table (matrix table) in which the stack height determination threshold is associated with the flute and sheet dimensions of the cardboard sheet SH. Basically, as the sheet size is larger, the stack height determination threshold is set to a smaller value. The reason is as follows. The corrugated cardboard sheet SH is stacked on the feeding table 20 in a forward inclined posture, and the load is not uniformly applied to the entire top surface of the lowermost sheet, but the load is biased to the front side of the lowermost sheet (see FIG. 1). In the above, all the cardboard sheets SH on the feeding table 20 are illustrated in a horizontal posture, but in fact, the upper layer portion of the sheet pile on the feeding table 20 may be stacked in a forward leaning posture). For this reason, even if the flutes are the same, the load applied to the front side of the lowermost sheet varies depending on the sheet size. Here, since the sheet weight per sheet is heavier as the sheet size is larger, the total sheet weight with respect to the stack height also becomes heavier. Therefore, as the sheet size increases, the load on the lowermost sheet does not decrease unless the stack height decreases. Therefore, the product height at which the advance deviation occurs is reduced. Therefore, as described above, as the sheet size is larger, the stack height determination threshold is set smaller.

  FIG. 18B schematically shows a correspondence table (matrix table) in which shift amount setting values are associated with flutes and sheet dimensions of the cardboard sheet SH. Basically, the shift amount setting value is set to a larger value as the sheet dimension is larger. The reason is as follows. Since the sheet weight per sheet is heavier as the sheet size is larger, the total sheet weight becomes heavier with respect to the stacking height. Therefore, the larger the sheet size, the larger the amount of change in the total sheet weight relative to the change in stack height. The larger the amount of change in the total sheet weight, the larger the amount of advance deviation. Therefore, as described above, as the sheet size is larger, the shift amount setting value is set larger.

  As described above, by setting the stack height determination threshold value and the shift amount setting value in accordance with the sheet size of the corrugated cardboard sheet SH, the occurrence of conveyance deviation can be appropriately prevented for the corrugated cardboard sheet SH of various dimensions.

  As the sheet dimensions used for setting the stack height determination threshold value and the shift amount setting value, it is preferable to apply the dimensions of the cardboard sheet SH along the feeding direction (conveying direction) FD. This is because the use of the dimension along the feeding direction FD is easier to control than using the sheet area of the corrugated sheet SH or the like. However, the stack height determination threshold and the shift amount setting value may be set using the sheet area of the cardboard sheet SH or the dimension in the width direction (direction orthogonal to the feeding direction FD) of the cardboard sheet SH.

  In addition, the operator can change the stack height determination threshold and the shift amount setting value set in the correspondence table (matrix table) as described above by operating the operation panel 240 as appropriate.

(Modification 4)
In the embodiment described above, the stack height determination threshold and the shift amount setting value are set according to the flutes of the cardboard sheet SH, but in the modification, the basis weight of the cardboard sheet SH (density (g / g of cardboard sheet SH) The stack height determination threshold and the shift amount setting value may be set according to m ² ). That is, the stack height determination threshold and the shift amount setting value may be set in consideration of the type of the base paper constituting the corrugated cardboard sheet SH. The basis weight is an example of the “specification” of the cardboard sheet SH.

In particular, it is preferable to set the stack height determination threshold and the shift amount setting value in accordance with all the flutes, sheet dimensions and basis weight of the cardboard sheet SH. There are various basis weights of corrugated sheet SH such as 120, 160, 180, ²⁰⁰ g / m ² and so, the weight of corrugated sheet SH depending on the type of base paper, even with the same flute and the same dimensions. Because it changes. Specifically, the stack height determination threshold is set to a smaller value as the basis weight is larger, and the shift amount setting value is set to a larger amount as the basis weight is larger.

  As described above, by setting the stack height determination threshold value and the shift amount setting value in accordance with the basis weight of the cardboard sheet SH, it is possible to appropriately prevent the occurrence of conveyance deviation of the cardboard sheet SH having various basis weights.

(Modification 5)
In the embodiment described above, four types of roller control patterns including the basic roller control pattern are prepared, but more types of roller control patterns may be prepared. For example, roller control patterns for the standard size and small size of the cardboard sheet SH may be created, and the roller control patterns may be used properly depending on the sheet size of the order. In this example, four types of roller control patterns including a basic roller control pattern may be prepared for standard sizes, and four types of roller control patterns including a basic roller control pattern may be prepared for small sizes. Further, the shift amount setting value is not limited to three values of +1 mm, +2 mm and +3 mm, and for example, five values of +1 mm, +2 mm, +3 mm, +4 mm and +5 mm may be used.

(Modification 6)
In the embodiment described above, the plurality of roller control patterns created in advance are stored in the roller control pattern memory 261, and the roller control pattern corresponding to the shift amount setting value is applied among the plurality of roller control patterns. . In a modification, instead of storing a plurality of roller control patterns created in advance in this manner, the roller control pattern to be applied may be obtained by calculation. In this modification, the roller control pattern memory 261 becomes unnecessary, the roller motor control device 254 stores a formula for creating the roller control pattern, and the motion controller 260 calculates the roller control pattern calculated according to this formula. send. The roller control pattern can be calculated from the shift amount setting value, the diameter Dp of the printing cylinders 30A, 31A, and the like. In particular, based on the shift amount setting value, the speed control pattern (acceleration start timing, acceleration end timing, acceleration magnitude, etc.) of the acceleration area applied to the corrugated cardboard sheet SH in the roller control pattern may be calculated. According to such a modification, the storage capacity can be reduced because it is not necessary to store the roller control pattern.

(Modification 7)
In the embodiment described above, the speed control pattern of the acceleration area to be applied is changed to two stages by determining using the stack height determination threshold with respect to the stack height of the cardboard sheet SH, but deformation In the example, the speed control pattern of the acceleration region to be applied may be changed to three or more stages by determining using the two or more stack height determination thresholds with respect to the stack height of the cardboard sheet SH. For example, for B flute, 50 mm may be used as the first threshold of the stack height determination threshold, and 30 mm may be used as the second threshold of the stack height determination threshold. In this case, +1 mm may be used as the shift amount setting value corresponding to the first threshold, and +2 mm may be used as the shift amount setting value corresponding to the second threshold. In this case, the roller control pattern of No. 1 is changed when the stack height becomes 50 mm or more and less than 50 mm, and the roller control pattern of No. 2 is changed when the stack height becomes 30 mm or less than 30 mm. It will be.

(Modification 8)
In the above-described embodiment, the speed control pattern of the acceleration region to be applied is changed when the stack height of the cardboard sheet SH becomes equal to or higher than the stack height determination threshold and becomes less than the stack height determination threshold (switched However, in the modification, the speed control pattern of the applied acceleration region may be gradually changed according to the passage of time after the start of feeding without using such a product height determination threshold. For example, a change in the stack height of the cardboard sheet SH may be detected continuously, and may be changed to a roller control pattern according to the detected stack height every second after the start of feeding. Specifically, the start position of the acceleration region may be gradually shifted from the rotation angle 0 ° or the end position of the acceleration region may be gradually shifted from the rotation angle 65 ° according to the detected product height.

  In a further modification, the operator looks at the stack height and operates the operation panel 240 without using the stack height determination threshold or the stack height detection sensor 195 to change the roller control pattern at an arbitrary timing. May be In this case, the operator may set the shift amount set value by manual input via the operation panel 240 without setting the shift amount set value in advance.

(Modification 9)
In the embodiment described above, control is performed using the stacking height of the cardboard sheet SH on the feeding table 20, but in the modification, the cardboard sheet SH on the feeding table 20 is used instead of the stacking height. Parameters other than the stack height (such as flutes and sheet dimensions and basis weights of the corrugated sheet SH) may be used, which are related to the weight of. In a further modification, the weight of the cardboard sheet SH on the feeding table 20 may be used. In that case, the weight of the cardboard sheet SH on the feeding table 20 may be detected by a sensor, or the weight of the cardboard sheet SH on the feeding table 20 may be calculated. When the calculation is used, the weight of the cardboard sheet SH on the feeding table 20 can be obtained from the stacking height of the cardboard sheet SH, the flute size, the sheet size, the basis weight and the like.

(Modification 10)
In the embodiment described above, the stop area R14 is included in the roller control pattern, but in a modification, a roller control pattern not including the stop area may be applied. In the roller control pattern which does not include the stop area, the top surface of the grate 141 descends from the top surface of the feeding rollers 124 to 127 at the same time as the speeds of the feeding rollers 124 to 127 become 0, and the corrugated sheet SH and the feeding roller Since the contacts 124 to 127 are in contact, when the acceleration start timing is changed as in the embodiment described above, it is also necessary to change the elevation timing of the grate 141. However, when the magnitude of the acceleration is changed as in the first modification, it is not necessary to change the timing of raising and lowering the grate 141.

(Modification 11)
In the embodiment described above, the corrugated cardboard sheet feeding device 2 includes the grate 141. However, the present invention is a corrugated cardboard sheet feeding device without grit, that is, corrugated cardboard sheets are continuously fed by only feeding rollers. The present invention is also applicable to a sheet feeding apparatus. In this modification, the stop timing of each feeding roller may be adjusted according to the sheet size of the corrugated cardboard sheet.

DESCRIPTION OF SYMBOLS 1 Corrugated cardboard box making machine 2 Corrugated cardboard sheet feeding device 3 Printing device 4 Creaser slotter 5 Die cutter 20 Feeding table 23, 24 Feed roll 30, 31 Printing unit 30A, 31A Printing cylinder 41, 42 Slotter unit 50 Die cylinder 90, 91 102, 103 Roller motors 124, 125, 126, 127 Feeding rollers 141 Grate 195 Stack height detection sensor 210 Lower control device 220 Program memory 240 Operation panel 244 Information display section 254 Roller motor control device 255 Pattern number setting memory 260 Motion Controller 261 Roller control pattern memory

Claims (24)

A corrugated sheet feeder,
A feeding table on which stacked cardboard sheets are placed;
A feeding roller for feeding the lowermost corrugated sheet among the corrugated sheets stacked on the feeding table one by one;
A roller motor that rotationally drives the feeding roller;
An acceleration area for accelerating the rotation of the feed roller, a constant speed area for rotating the feed roller at a constant speed after the acceleration area, and a feed speed of the feed roller after the constant speed area A control device configured to variably control the roller motor based on a speed control pattern including a deceleration region for decelerating rotation, and feeding the corrugated cardboard sheet by the feeding roller;
Have
While the control device is performing one order production, the rear end of the lowermost corrugated sheet is the corrugated sheet, regardless of the change in weight of the corrugated sheet stacked on the feeding table. A sheet weight related value related to the weight of the corrugated cardboard sheet stacked on the feeding table so that the feeding timing which is fed out of the feeding device and fed to the downstream side of the corrugated cardboard sheet feeding device becomes constant. Are configured to change the speed control pattern of the acceleration region based on
A corrugated sheet feeder characterized in that.   The corrugated board according to claim 1, wherein the control device is configured to change the speed control pattern of the acceleration region so as to change the timing of starting the acceleration of the corrugated cardboard sheet based on the sheet weight related value. Sheet feeding device.   The control device is configured to change the speed control pattern of the acceleration region so as to change the magnitude of the acceleration when accelerating the corrugated cardboard sheet based on the sheet weight related value. Corrugated sheet feeder as described.   The controller is configured to delay the timing of starting acceleration of the corrugated cardboard sheet when the sheet weight related value is less than a predetermined threshold than when the sheet weight related value is greater than the threshold, and / The corrugated sheet feeder according to claim 1, wherein the speed control pattern of the acceleration area is changed so as to reduce the magnitude of the acceleration when accelerating the corrugated sheet.   The corrugated sheet feeder according to claim 4, wherein the threshold value is set based on the specification of the corrugated sheet fed by the corrugated sheet feeder. The specification of the corrugated sheet is a flute of the corrugated sheet,
The corrugated sheet feeder according to claim 5, wherein the threshold is set to a smaller value as the flute is thinner. The specification of the corrugated sheet is the size of the corrugated sheet,
The corrugated sheet feeder according to claim 5 or 6, wherein the threshold is set to a smaller value as the dimension is larger. The specification of the corrugated sheet is the basis weight of the corrugated sheet,
The corrugated sheet sheet feeding apparatus according to any one of claims 5 to 7, wherein the threshold value is set to a smaller value as the basis weight is larger.   In the case where the control device causes the sheet weight related value to change from being above the threshold value to being below the threshold value while feeding one corrugated sheet by the corrugated sheet feeder. The corrugated sheet feeder according to any one of claims 4 to 8, wherein the speed control pattern of the acceleration area applied to feed the corrugated sheet is not changed. The operator further comprises an input device for inputting the threshold value,
The corrugated sheet sheet feeding apparatus according to any one of claims 4 to 9, wherein the control device uses the threshold value input to the input device.   The control device is configured to store the threshold used in an order, and to read out and apply the stored threshold when an order of the same specification as the order in which the threshold is stored is next performed. The corrugated sheet feeder according to any one of claims 4 to 10, wherein The controller is
Based on the sheet weight related value, change the speed control pattern of the acceleration region so as to delay the timing of starting acceleration of the corrugated sheet and / or reduce the magnitude of the acceleration when accelerating the corrugated sheet. As well as
The sheet weight related value is configured to change a feed adjustment amount indicating an amount to delay the timing of starting the acceleration and / or an amount to decrease the magnitude of the acceleration. The corrugated sheet feeder according to any one of 11.   The corrugated sheet feeder according to claim 12, wherein the feeding adjustment amount is set based on the specifications of the corrugated sheet fed by the corrugated sheet feeder. The specification of the corrugated sheet is a flute of the corrugated sheet,
The corrugated sheet feeder according to claim 13, wherein the feeding adjustment amount is set to a larger amount as the flute is thinner. The specification of the corrugated sheet is the size of the corrugated sheet,
The corrugated sheet feeder according to claim 13 or 14, wherein the feed adjustment amount is set to a larger amount as the dimension is larger. The specification of the corrugated sheet is the basis weight of the corrugated sheet,
The corrugated sheet feeder according to any one of claims 13 to 15, wherein the feeding adjustment amount is set to a larger amount as the basis weight is larger. The system further comprises an input device for the operator to input the feed adjustment amount;
The corrugated sheet feeder according to any one of claims 12 to 16, wherein the control device uses the feed adjustment amount input to the input device.   The control device stores the feeding adjustment amount used in an order, and the stored feeding is performed when an order having the same specifications as the order in which the feeding adjustment amount is stored is subsequently performed. The corrugated sheet feeder according to any one of claims 12 to 17, which is configured to read out and apply the adjustment amount.   The control device stores in advance a plurality of speed control patterns different in the acceleration region, and selects a speed control pattern according to the feeding adjustment amount from the plurality of speed control patterns. A corrugated sheet feeder according to any one of claims 12-18, adapted to apply.   The corrugated sheet according to any one of claims 12 to 18, wherein the control device is configured to calculate and apply a speed control pattern according to the feeding adjustment amount according to a predetermined calculation formula. apparatus. The controller is
The speed control pattern is applied to each of these two cardboard sheets so that two cardboard sheets can be fed out while the printing cylinder of the printing device provided on the downstream side of the cardboard sheet feeding device makes one revolution. Apply,
The speed control pattern of the acceleration area applied to the cardboard sheet of the first delivery among the two cardboard sheets, and the speed control pattern of the cardboard sheet of the two cardboard sheets applied to the later delivery. 21. A corrugated sheet feeder as claimed in any one of the preceding claims, wherein both of the speed control patterns of the acceleration zone are adapted to be changed based on the sheet weight related values.   The corrugated sheet feeder according to any one of claims 1 to 21, wherein the sheet weight related value is the height of the corrugated sheet stacked on the feeding table.   23. The corrugated sheet feeder according to claim 22, further comprising a sensor for detecting the height of the corrugated sheet stacked on the feeding table. A corrugated sheet feeder according to any one of claims 1 to 23,
A plurality of processing devices provided on the downstream side in the delivery direction by the corrugated sheet feeder and including at least the printing device;
A carton sheet making machine characterized by having.

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