JP7101958B2 - Corrugated cardboard sheet feeder and corrugated cardboard sheet making machine - Google Patents

Description

The present invention relates to a corrugated cardboard sheet feeding device that feeds out laminated corrugated cardboard sheets one by one, and a corrugated cardboard sheet making machine having this corrugated cardboard sheet feeding device.

Conventionally, a plurality of feeding rollers that rotate along the feeding direction of the corrugated cardboard sheet and a great that adjusts the contact and separation between the feeding roller and the corrugated cardboard sheet by moving up and down with respect to the feeding roller are used for laminating. A corrugated cardboard sheet feeding device (so-called rotary feeder) that feeds the corrugated cardboard sheets one by one toward the printing device is applied to a corrugated cardboard sheet making machine.

This type of corrugated cardboard sheet feeding device is disclosed in, for example, Patent Documents 1 and 2. Patent Document 1 discloses a corrugated cardboard sheet feeding device in which the rotational movement of a drive shaft is converted into the operation of each component via a mechanical transmission. On the other hand, in Patent Document 2, the drive motor is controlled based on a predetermined speed control pattern (electronic cam control) to operate each component, thereby mechanically as described in Patent Document 1. A corrugated cardboard sheet feeding device that does not require a simple transmission is disclosed.

US Pat. No. 4,614,335 Japanese Unexamined Patent Publication No. 2016-128355

In the corrugated cardboard sheet feeding device as described above, the weight of the sheet piles stacked above the corrugated cardboard sheet is applied to the upper surface of the lowest layer corrugated cardboard sheet to be fed among the laminated corrugated cardboard sheets. To. Then, when the corrugated cardboard sheet of the lowest layer is sent out, a frictional force (load) due to the weight of the sheet pile is generated on the upper surface of the sheet. When the weight of the sheet pile is large, the frictional force is large, so that the timing of feeding the corrugated cardboard sheet from the corrugated cardboard sheet feeding device tends to be delayed. The weight of the sheet pile increases as the height of the laminated corrugated cardboard sheets (hereinafter, simply referred to as "stack height" as appropriate) increases. The above-mentioned feeding timing is such that the rear end of the lowermost corrugated cardboard sheet among the corrugated cardboard sheets laminated on the feeding table comes out of the corrugated cardboard sheet feeding device and moves to the downstream side of the corrugated cardboard sheet feeding device. It means the timing of being sent out.

By the way, in the corrugated cardboard sheet making machine, in the preparatory work before production, one corrugated cardboard sheet is fed by the corrugated cardboard sheet feeding device, and the rotation phase adjustment (so-called register) of the printing cylinder, the slotter, and the die cylinder on the downstream side is performed. Adjustment) is performed. In this preparatory work, only one corrugated cardboard sheet is fed and trial processing is performed, the processing position of the completed corrugated cardboard sheet is confirmed, and a stamp or slotter knife is used so that the processing position is exactly the predetermined position on the sheet. And to adjust the rotation phase of the punched wood mold. When performing such preparatory work, the corrugated cardboard sheets are already piled up high on the feeding table. Therefore, the corrugated cardboard sheet of the lowermost layer, which is fed one sheet in the preparatory work, is fed from the corrugated cardboard sheet feeding device under the condition that a large frictional force is generated because the weight of the sheet pile is heavy. That is, the corrugated cardboard sheet is sent out under the condition that the feeding timing is likely to be delayed. Therefore, the rotation phase of each processing unit is adjusted according to the corrugated cardboard sheet sent out under such conditions.

When the above preparatory work is completed and the actual production on the corrugated cardboard sheet making machine is started, the corrugated cardboard sheet feeding device continuously feeds the corrugated cardboard sheets one by one on the feeding table. The height of the seat pile gradually decreases. As the stacking height becomes lower, the weight of the sheet pile becomes smaller, and the frictional force generated on the upper surface of the corrugated cardboard sheet in the lowermost layer becomes smaller. Therefore, the feeding timing of the corrugated cardboard sheet in the lowest layer tends to be earlier. The earlier the feeding timing of the corrugated cardboard sheet, the earlier the timing at which the corrugated cardboard sheet reaches each processing unit on the downstream side.

Here, due to the rotation phase adjustment in the preparatory work as described above, each processing unit is rotated at a timing that matches the corrugated cardboard sheet sent out under the condition that the feeding timing is likely to be delayed. When the corrugated cardboard sheet is fed earlier and the corrugated cardboard sheet feeding timing is earlier, the position of the corrugated cardboard sheet in the transport direction (feeding direction) is shifted with respect to each processing unit on the downstream side of the corrugated cardboard sheet feeding device (hereinafter referred to as). Appropriately referred to as "transport deviation"). Specifically, a misalignment occurs in which the corrugated cardboard sheet is relatively advanced with respect to each processing unit. If such an advance deviation occurs, the processing position on the corrugated cardboard sheet may shift, and the sheet may become a defective product.

The present invention has been made to solve the above-mentioned problems, and is a corrugated cardboard capable of appropriately suppressing a transfer deviation of the corrugated cardboard sheet due to a change in the weight of the corrugated cardboard sheets laminated on the feeding table. It is an object of the present invention to provide a sheet feeding device and a corrugated cardboard sheet making machine.

In order to achieve the above object, the present invention is a corrugated cardboard sheet feeding device, which is a corrugated cardboard sheet on which a laminated corrugated cardboard sheet is placed and a corrugated cardboard sheet laminated on the corrugated cardboard sheet. A feeding roller that feeds out the bottom layer of corrugated cardboard one by one, a roller motor that rotationally drives the feeding roller, an acceleration region for accelerating the rotation of the feeding roller, and a feeding roller after this acceleration region. The roller motor is controlled at a variable speed based on a speed control pattern including a constant speed region for rotating at a constant speed and a deceleration region for decelerating the rotation of the feeding roller after this constant speed region. It has a control device configured to feed the corrugated board sheet by a feed roller, the control device of the weight of the corrugated board sheet laminated on the feed table while performing one order production. Regardless of the change, on the feeding table so that the rear end of the corrugated board sheet of the lowest layer comes out from the corrugated cardboard sheet feeding device and is sent to the downstream side of the corrugated board sheet feeding device at a constant feeding timing. Based on the sheet weight-related value associated with the weight of the laminated corrugated cardboard sheet, the speed control pattern in the acceleration region is configured to change, and the control device is configured to change the sheet weight-related value when the sheet weight-related value is less than a predetermined threshold. Speed control pattern in the acceleration region so that the timing to start accelerating the corrugated board sheet is delayed and / or the magnitude of acceleration when accelerating the corrugated board sheet is smaller than when the related value is equal to or more than the threshold value. When the control device changes from a state in which the sheet weight-related value is equal to or more than the threshold value to a state in which the value is below the threshold value while one corrugated cardboard sheet is being fed by the corrugated board sheet feeding device. Is characterized in that it is configured so as not to change the speed control pattern of the acceleration region applied to deliver the corrugated cardboard sheet .
According to the present invention configured in this way, the feeding timing is constant regardless of the change in the weight of the corrugated cardboard sheet on the feeding table while executing one order production. The speed control pattern in the acceleration region is changed based on the sheet weight-related value related to the weight of the corrugated cardboard sheets laminated on the feed table. As a result, it is possible to appropriately suppress the transport deviation (advance deviation) of the corrugated cardboard sheet due to the change in the weight of the corrugated cardboard sheet on the feeding table as described above.
Further, according to the present invention, as the weight of the corrugated cardboard sheet on the feeding table becomes smaller, the feeding timing tends to be earlier. Therefore, a threshold value for determining the size of the sheet weight-related value corresponding to the sheet weight is used. Therefore, when the sheet weight-related value is less than the threshold value, the timing for starting the acceleration of the corrugated cardboard sheet is delayed and / or the magnitude of the acceleration when accelerating the corrugated cardboard sheet is smaller than when it is above the threshold value. do. As a result, the feeding timing can be effectively kept constant regardless of the change in the weight of the corrugated cardboard sheet on the feeding table.
Further, according to the present invention, even if the sheet weight-related value changes from a state in which the sheet weight-related value is equal to or more than the threshold value to a state in which the value is less than the threshold value in the middle of one cycle cycle in which one corrugated cardboard sheet is sent out, this cycle cycle Do not change the speed control pattern applied in. As a result, it is possible to prevent an excessive load from being applied to the roller motor that rotationally drives the feeding roller.

Further, according to the present invention, by changing the timing at which the acceleration of the corrugated cardboard sheet is started, the feeding timing can be appropriately and constantly maintained regardless of the change in the weight of the corrugated cardboard sheet on the feeding table. Become. Further, since the acceleration start timing is changed while maintaining the same magnitude of acceleration, slipping of the corrugated cardboard sheet on the feeding roller can be suppressed. That is, when the acceleration is increased, the corrugated cardboard sheet tends to slip on the feeding roller, but by keeping the magnitude of the acceleration the same, such slip can be suppressed. Therefore, stable delivery by the corrugated cardboard sheet feeding device can be ensured.

Further, according to the present invention, by changing the magnitude of acceleration when accelerating the corrugated cardboard sheet, the feeding timing is appropriately and constantly maintained regardless of the change in the weight of the corrugated cardboard sheet on the feeding table. become able to. Further, since the magnitude of acceleration is changed while maintaining the same acceleration start timing, it is possible to prevent the corrugated cardboard sheet in the lowermost layer from falling onto the feeding roller during acceleration and slipping. That is, if the acceleration start timing is advanced, the acceleration of the feeding roller starts before the corrugated cardboard sheet of the lowest layer comes into contact with the feeding roller, and there is a possibility that the corrugated cardboard sheet of the lowest layer slips when it comes into contact with the feeding roller. However, if the acceleration start timing is kept the same, the difference between the timing when the bottom layer corrugated cardboard sheet contacts the feeding roller and the timing when the feeding roller starts accelerating is kept constant. Slip can be suppressed. Therefore, stable delivery by the corrugated cardboard sheet feeding device can be ensured.

In the present invention, the threshold value is preferably set based on the specifications of the corrugated cardboard sheet delivered by the corrugated cardboard sheet feeding device.
According to the present invention configured as described above, it is possible to appropriately suppress the occurrence of transport deviation for corrugated cardboard sheets having various specifications.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the flute of the corrugated cardboard sheet, and the threshold value is set to a smaller value as the flute is thinner.
The corrugated board sheet with a thin flute has a higher density than the corrugated cardboard sheet with a thick flute, so that the weight of the corrugated board sheet on the feeding table is reduced, so that the feeding timing is accelerated. Tends to be relatively slow, in other words, the stacking height of corrugated cardboard sheets that accelerates the feeding timing tends to be low (the same shall apply hereinafter). Therefore, in the present invention, the thinner the flute of the corrugated cardboard sheet, the smaller the threshold value for determining the sheet weight-related value. As a result, it is possible to appropriately suppress the occurrence of transport misalignment for various flute corrugated cardboard sheets.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the dimension of the corrugated cardboard sheet, and the threshold value is set to a smaller value as the dimension is larger.
Since the weight of a large-sized corrugated cardboard sheet is heavier than that of a smaller-sized corrugated cardboard sheet, the weight of the corrugated cardboard sheet on the feeding table is reduced, so that the feeding timing is accelerated. 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 value for determining the sheet weight-related value. As a result, it is possible to appropriately suppress the occurrence of transport misalignment for corrugated cardboard sheets having various dimensions.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the basis weight of the corrugated cardboard sheet, and the threshold value is set to a smaller value as the basis weight is larger.
A corrugated board sheet having a large basis weight (corresponding to the density of the corrugated cardboard sheet) has a faster feeding timing due to a smaller weight of the corrugated cardboard sheet on the feeding table as compared with a corrugated cardboard sheet having a small basis weight. Such a period tends to be relatively late. Therefore, in the present invention, the larger the basis weight of the corrugated cardboard sheet, the smaller the threshold value for determining the sheet weight-related value. As a result, it is possible to appropriately suppress the occurrence of transport deviation for corrugated cardboard sheets having various basis weights.

In the present invention, preferably, the operator further has an input device for inputting a threshold value, and the control device uses the threshold value input to the input device.
According to the present invention configured in this way, the operator can appropriately change the threshold value according to the order specifications. As a result, it is possible to appropriately cope with various order specifications.

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

In the present invention, preferably, the control device delays the timing of starting the acceleration of the corrugated board sheet and / or reduces the magnitude of the acceleration when accelerating the corrugated board sheet based on the sheet weight-related value. , The speed control pattern in the acceleration region is changed, and the feed adjustment amount indicating the amount of delaying the timing of starting acceleration and / or the amount of reducing the magnitude of acceleration is configured to be changed based on the seat weight-related value. ing.
According to the present invention configured in this way, 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. In consideration of the above, the amount of delaying the timing of starting the acceleration of the corrugated cardboard sheet and / or the amount of reducing the magnitude of the acceleration when accelerating the corrugated cardboard sheet is changed. As a result, the feeding timing can be effectively kept constant regardless of the change in the weight of the corrugated cardboard sheet on the feeding table.

In the present invention, the feeding adjustment amount is preferably set based on the specifications of the corrugated cardboard sheet fed by the corrugated cardboard sheet feeding device.
According to the present invention configured as described above, it is possible to appropriately suppress the occurrence of transport deviation for corrugated cardboard sheets having various specifications.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the flute of the corrugated cardboard sheet, and the feeding adjustment amount is set to a larger amount as the flute is thinner.
Since the corrugated cardboard sheet with a thin flute has a higher density than the corrugated cardboard sheet with a thick flute, the amount of change in the weight of the corrugated cardboard sheet on the feeding table as the corrugated board sheet feeding work progresses. Will increase, and the degree to which the delivery timing will be earlier will increase. Therefore, in the present invention, the thinner the flute of the corrugated cardboard sheet to be fed, the larger the feed adjustment amount indicating the amount of delaying the timing of starting the acceleration of the corrugated cardboard sheet and / or the amount of reducing the magnitude of the acceleration. As a result, it is possible to appropriately suppress the occurrence of transport misalignment for various flute corrugated cardboard sheets.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the dimension of the corrugated cardboard sheet, and the feeding adjustment amount is set to a larger amount as the dimension is larger.
Since the weight of each large-sized corrugated cardboard sheet is heavier than that of the smaller-sized corrugated cardboard sheet, the change in the weight of the corrugated cardboard sheet on the feeding table as the feeding work of the corrugated cardboard sheet progresses. The amount increases, and the degree to which the delivery timing is advanced increases. Therefore, in the present invention, the larger the size of the corrugated cardboard sheet to be fed, the larger the feed adjustment amount. As a result, it is possible to appropriately suppress the occurrence of transport misalignment for corrugated cardboard sheets having various dimensions.

In the present invention, preferably, the specification of the corrugated cardboard sheet is the basis weight of the corrugated cardboard sheet, and the feeding adjustment amount is set to a larger amount as the basis weight is larger.
Compared to the corrugated cardboard sheet with a small basis weight, the corrugated cardboard sheet with a large basis weight has a larger change in the weight of the corrugated cardboard sheet on the feeding table as the feeding work of the corrugated cardboard sheet progresses, and the corrugated cardboard sheet is fed. The degree to which the timing is advanced increases. Therefore, in the present invention, the larger the basis weight of the corrugated cardboard sheet to be sent out, the larger the above-mentioned feed adjustment amount. As a result, it is possible to appropriately suppress the occurrence of transport misalignment for corrugated cardboard sheets of various base papers.

In the present invention, preferably, the operator further has an input device for inputting the feed adjustment amount, and the control device uses the feed adjustment amount input to the input device.
According to the present invention configured in this way, the operator can appropriately change the feed feed adjustment amount according to the order specifications. As a result, it is possible to appropriately cope with various order specifications.

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

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

In the present invention, preferably, the control device is configured to obtain and apply a speed control pattern according to the feed adjustment amount by a predetermined calculation formula.
According to the present invention configured as described above, since the speed control pattern is obtained by calculation, it is not necessary to store the speed control pattern, and the storage capacity can be reduced.

In the present invention, preferably, the control device feeds 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. The speed control pattern is applied to each of the two corrugated cardboard sheets, the speed control pattern in the acceleration region applied to the corrugated cardboard sheet to be sent out first, and the corrugated cardboard sheet to be sent out later. Both speed control patterns in the acceleration region applied to the corrugated board sheet are configured to change based on the 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 sheet caused by the change in the weight of the corrugated cardboard sheet on the feeding table. It is possible to appropriately suppress the transfer deviation.

In the present invention, preferably, the sheet weight-related value is the height of the corrugated cardboard sheets laminated on the feeding table.
According to the present invention configured as described above, the stacking height of the corrugated cardboard sheets, which uniquely indicates the weight of the corrugated cardboard sheets 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 corrugated cardboard sheet itself, which is relatively difficult to detect.

In the present invention, it is preferable to further have a sensor for detecting the height of the corrugated cardboard sheets laminated on the feeding table.
According to the present invention configured as described above, the stacking 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 includes at least the above-mentioned corrugated cardboard sheet feeding device and a printing device provided on the downstream side in the feeding direction of the corrugated cardboard sheet feeding device and printing on the corrugated cardboard sheet. It is preferable to have the processing equipment of.

According to the corrugated cardboard sheet feeding device and the corrugated cardboard sheet making machine of the present invention, it is possible to appropriately suppress the transport deviation (advance deviation) of the corrugated cardboard sheet due to the change in the weight of the corrugated cardboard sheet laminated on the feeding table. Can be done.

It is a front view which shows the whole structure of the corrugated cardboard sheet box 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. FIG. 5 is an enlarged cross-sectional view of the corrugated cardboard sheet feeding device according to the embodiment of the present invention as viewed along the line AA in FIG. It is a figure which shows typically the connection relationship between the support mechanism and the swing mechanism of the corrugated cardboard sheet feeding device by embodiment of this invention. In the embodiment of the present invention, it is a figure which shows the state which the swing angle of a swing member changes with the rotation of the eccentric member of a swing mechanism. It is a block diagram which shows the electric structure of the corrugated cardboard sheet box making machine by embodiment of this invention. It is explanatory drawing about the product height determination 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 the shift amount setting value by embodiment of this invention. It is explanatory drawing about the roller control pattern number and the roller control pattern by embodiment of this invention. It is explanatory drawing about the basic roller control pattern which is 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 of the Great when the 2nd example of the roller control pattern by Embodiment of this invention is applied. It is explanatory drawing about the change timing of the roller control pattern by embodiment of this invention. It is explanatory drawing about the 3rd example of the roller control pattern which is the modification of the Embodiment of this invention. It is explanatory drawing about the basic roller control pattern which is the 4th example of the 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 the Embodiment of this invention. It is explanatory drawing about the 6th example of a roller control pattern which is a modification of the 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, the corrugated cardboard sheet feeding device and the corrugated cardboard sheet box making machine according to the embodiment of the present invention will be described with reference to the accompanying drawings.

[overall structure]
FIG. 1 is a front view showing the overall configuration of a corrugated cardboard sheet box making machine according to an embodiment of the present invention. In FIG. 1, the corrugated cardboard sheet making machine 1 has a corrugated cardboard sheet feeding device 2 that feeds out laminated corrugated cardboard sheet SH one by one, a printing device 3 that prints on the corrugated cardboard sheet SH, and a ruled line on the corrugated cardboard sheet SH. A crease slotter 4 for cutting a groove to form a joint margin, and a die cutter 5 for forming a punched portion having a predetermined shape on the corrugated cardboard sheet SH.

The corrugated cardboard sheet feeding device 2 includes a feeding table 20. A large number of corrugated cardboard sheets SH are loaded on the feeding table 20 between the front gate 21 and the back guide 22. The front gate 21 is arranged so that the corrugated cardboard sheet SH is 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 in a direction parallel to the feeding direction FD with respect to the front gate 21, and is configured to accommodate corrugated cardboard sheets having different sheet lengths in the feeding direction FD. The corrugated cardboard sheet feeding device 2 includes a large number of feeding rollers, a great that can be raised and lowered, and a pair of feed rolls 23 and 24. When the Great descends from a large number of feeding rollers, the large number of feeding rollers come into contact with the corrugated board sheet SH at the bottom of the large number of corrugated cardboard sheet SHs, thereby feeding both corrugated cardboard sheets SH one by one. It is sent to rolls 23 and 24. Both feed rolls 23 and 24 feed the corrugated cardboard sheet SH one by one to the printing apparatus 3. Both feed rolls 23 and 24 are driven by being connected to the main drive motor MT. The detailed configuration of the corrugated cardboard sheet feeding device 2 will be described later.

Further, above the feeding table 20, a stacking height detection sensor 195 for detecting the height (stacking height) of the corrugated cardboard sheet SH laminated on the feeding table 20 is provided. The stack height detection sensor 195 is composed of a photoelectric sensor, and irradiates light toward the uppermost corrugated cardboard sheet SH among the corrugated cardboard sheet SH laminated on the feeding table 20, and the corrugated cardboard sheet SH is used. The stack height is detected by receiving the reflected light.
The stacking height of the corrugated cardboard sheet SH laminated on the feeding table 20 is a parameter (correlated) related to the weight of the corrugated cardboard sheet SH laminated on the feeding table 20, and is described in the present invention. This is an example of the "seat weight-related value" in the invention. Hereinafter, an embodiment using the stacking height of the corrugated cardboard sheet SH as the “sheet weight-related value” in the present invention will be shown.

The printing device 3 includes two printing units 30 and 31. Each printing unit includes a printing cylinder, a printing plate member, an ink coating device, and a press roll. The printing plate member is attached to the outer peripheral surface of the printing cylinder. The ink application device includes an inking roll of a different color for each printing unit. The printing device 3 prints two colors on the corrugated cardboard sheet SH by both printing units 30 and 31, and supplies the printed corrugated cardboard sheet SH to the crease slotter 4. The printing units 30 and 31 are driven by being connected to the main drive motor MT, respectively. The printing cylinders 30A and 31A of both printing units 30 and 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. Both stamping members 30B1 and 31B1 print two colors on one corrugated cardboard sheet SH fed in each processing cycle.

The crease slotter 4 includes a crease unit 40 and two slotter units 41 and 42. The cleaner unit 40 includes a pair of ruled line rolls arranged one above the other. Each slotter unit includes an upper slotter to which a slotter blade is attached and a lower slotter to which a groove that can be fitted with the slotter blade is formed. The crease slotter 4 uses the crease unit 40 and both slotter units 41 and 42 to perform ruled lines and grooving on the corrugated cardboard sheet SH to form a joint, and supplies the corrugated cardboard sheet SH with these processes to the die cutter 5. do. The cleaner unit 40 and both slotter units 41 and 42 are driven by being connected to the main drive motor MT, respectively. The slotter blades 41A1 and 42A1 are attached to the outer peripheral surfaces of the upper slotters of both slotter units 41 and 42, respectively. The slotter blade 41A1 performs grooving on the front end of one corrugated cardboard sheet SH fed in each processing cycle, and the slotter blade 42A1 groovs on the rear end of one corrugated cardboard sheet SH. To give.

The die cutter 5 includes a die cylinder 50 and an anvil cylinder 51 with a transport path interposed therebetween. The punching die 52 is attached to a plate-like body such as plywood veneer, and this plate-like body is wound around the outer peripheral surface of the die cylinder 50. The punching die 52A1 is punched at a desired position of the corrugated cardboard sheet SH that is continuously conveyed. The punching die 52A1 can be replaced with a punching die having a punching pattern according to the order when the order is changed. The die cylinder 50 and the anvil cylinder 51 are driven by being connected to the main drive motor MT, respectively. The punching die 52A1 punches one corrugated cardboard sheet SH fed in each processing cycle.

In addition, in FIG. 1, a corrugated cardboard sheet box making machine prepared for a one-sheet feeding mode in which only one corrugated cardboard sheet SH is fed in a predetermined processing cycle in which the printing cylinders 30A and 31A of the printing apparatus 3 rotate once. Although 1 is shown, the corrugated cardboard sheet making machine 1 can also perform a two-sheet feeding mode in which two corrugated cardboard sheet SHs are sequentially fed in a predetermined processing cycle. In the case of performing the two-sheet feeding mode, the printing apparatus 3 may use two printing plate members attached to the outer peripheral surface of the printing cylinder 30A and two printing plate members attached to the outer peripheral surface of the printing cylinder 31A. Often, in the crease slotter 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, and in the die cutter 5, the die cutter 5 may use two slotter blades. , Two punching dies attached to the outer peripheral surface of the die cylinder 50 may be used.

[Construction of corrugated cardboard sheet feeder]
The detailed configuration of the corrugated cardboard sheet feeding device 2 will be described with reference to FIGS. 2 to 5. FIG. 2 is a plan view showing the internal configuration of the corrugated cardboard sheet feeding device 2 below the feeding table 20, and FIG. 3 is a cross section of the corrugated cardboard sheet feeding device 2 cut according to the line AA shown in FIG. It is a figure. In FIG. 2, the corrugated cardboard sheet feeding device 2 includes a front frame 60, a rear frame 61, and a pair of intermediate frames 62 and 63 arranged between the frames 60 and 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 both intermediate frames 62 and 63, respectively. In FIG. 3, the lower frame 70 is fixed to the left frame 68 and the right frame 69, respectively.

The elevating motor 80 is composed of an AC servomotor and is fixed to a motor mounting plate 64. A pair of bearings 81 and 82 are fixed to the bearing mounting plate 65, respectively, and rotatably support the intermediate drive shaft 83. The rotating shaft of the elevating motor 80 is connected to the intermediate drive shaft 83 by the connecting body 84. The encoder 85 is connected to the rotating shaft of the elevating motor 80.

The first roller motor 90 and the second roller motor 91 are composed of an AC servo motor and are fixed to the motor mounting plate 64, respectively. A pair of bearings 92 and 93 are fixed to the bearing mounting plate 65, respectively, 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 the connecting body 95. A pair of bearings 96 and 97 are fixed to the bearing mounting plate 65, respectively, 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 the connecting body 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 are fixed to the motor mounting plate 66, respectively. A pair of bearings 104 and 105 are fixed to the bearing mounting plate 67, respectively, 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 the connecting body 107. A pair of bearings 108 and 109 are fixed to the bearing mounting plate 67, respectively, 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 the connecting body 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, the first to fourth roller support shafts 120 to 123 extend in the front-rear direction in a state parallel to each other and are rotatably supported by both intermediate frames 62 and 63, respectively. A large number of first feed rollers 124 are fixed to the first roller support shaft 120, and a large number of second feed rollers 125 are fixed to the second roller support shaft 121. A large number of third feed rollers 126 are fixed to the third roller support shaft 122, and a large number of fourth feed rollers 127 are fixed to the fourth roller support shaft 123. The first to fourth feeding rollers 124 to 127 are arranged in a staggered pattern so as not to interfere with each other. Feeding rollers 124-127 have the same diameter Dr.

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

The corrugated cardboard sheet feeding device 2 includes a motion conversion mechanism 140. The motion conversion mechanism 140 is a mechanism that converts the rotation of the elevating motor 80 in one direction into the elevating motion of the great 141. In FIG. 2, a large number of greats are arranged in the anteroposterior direction so as to cover a region in which a large number of feeding rollers 124 to 127 are arranged. In FIG. 2, only one great 141 is shown, and the other greats are not shown.

[Detailed configuration of motion conversion mechanism]
The motion conversion mechanism 140 includes a support mechanism 142 that supports the Great 141 so as to be able to move up and down, and a swing mechanism 143. The swing mechanism 143 converts the rotation of the elevating motor 80 in one direction into a swing motion and transmits it to the support mechanism 142. In this embodiment, one great 141 is supported by two support mechanisms 142 arranged in the front-rear direction 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 rotatably attached to the left attachment member 155 by a rotation shaft 157. The right two-arm lever 153 is rotatably attached to the right attachment member 156 by a rotation shaft 158.

In FIG. 3, the Great 141 is arranged horizontally above the four roller support shafts 120 to 123 and in close proximity to these roller support shafts. The left connecting block 150 is fixed to the left end of the Great 141 and extends downward. The right connecting block 151 is fixed to the right end of the Great 141 and extends downward. One arm portion 152A of the left two-arm lever 152 is connected to the lower end portion of the left connecting block 150 by a connecting pin 159. One arm portion 153A of the right two-arm lever 153 is connected to the lower end portion of the right connecting block 151 by the connecting pin 160.

The connecting rod 154 is arranged horizontally below the four roller support shafts 120 to 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 portion 152B of the left two-arm lever 152 by the connecting pin 162. The middle portion of the connecting rod 154 close to the right frame 69 is connected to the other arm portion 153B of the right two-arm lever 153 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 elevating drive shaft 170 is rotatably supported by the auxiliary frame 174 by bearings 176. The elevating drive shaft 170 is connected to the intermediate drive shaft 83 by the connecting body 177.

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

In FIG. 2, the elevating connection shaft 173 is rotatably supported on the right side surface of the right frame 69 by a plurality of bearings 179. The elevating connection shaft 173 is arranged in parallel with the roller support shafts 120 to 123. The plurality of connecting members 180 are fixed to the elevating connecting shaft 173 at positions corresponding to the plurality of supporting mechanisms 142, respectively. As shown in FIG. 3, each connecting member 180 is connected to the right end of the connecting rod 154 of the corresponding support mechanism 142 by a connecting pin 181.

5 (A) to 5 (C) show a state in which the swing angle of the swing member 172 changes with the rotation of the eccentric member 171. In FIG. 5, the reference angle position RP is an angle position that coincides with the line connecting the rotation center of the eccentric member 171 and the rotation center of the elevating connection shaft 173. The rotation center of the eccentric member 171 is also the rotation center of the elevating drive shaft 170. The angular position of the swing member 172 shown in FIG. 5A is a position rotated clockwise by a predetermined angle θs from the reference angle position RP. At the angular position of the swing member 172 shown in FIG. 5 (A), the great 141 is located at the lowest position at the lowest position. The angular position of the swing member 172 shown in FIG. 5C is a position rotated counterclockwise by a predetermined angle θs from the reference angle position RP. At the angular position of the swing member 172 shown in FIG. 5C, the great 141 is located at the uppermost uppermost position. The angular position of the swing member 172 shown in FIG. 5B is a position that coincides with the reference angular position RP. At the angular position of the swing member 172 shown in FIG. 5 (B), the great 141 is located 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 swing member 172 swings at the angle position shown in FIG. 5 (A), the right end portion of the connecting rod 154 is elastically deformed due to a slight downward movement of the connecting pin 181. It is configured to do.

[Rotation position sensor configuration]
A rotation position sensor 190 is provided to detect a predetermined rotation position of the elevating drive shaft 170. The rotation position sensor 190 includes an optical sensor 191 and a light-shielding body 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. As shown in FIG. 2, the light-shielding body 192 is fixed to the intermediate drive shaft 83 connected to the elevating drive shaft 170. Each time the elevating drive shaft 170 reaches a predetermined rotation position, the light-shielding body 192 blocks the light from the light emitting portion of the optical sensor 191.

In FIG. 4, the optical sensor 191 and the light-shielding body 192 are shown by an alternate long and short dash line. The rotation position of the light-shielding body 192 shown in FIG. 4 is the rotation position immediately before the light-shielding body 192 passes through the optical sensor 191. In the state shown in FIG. 4, the great 141 is located at a height before reaching the uppermost position. In the present embodiment, the rotation position sensor 190 generates a detection signal when the elevating drive shaft 170 rotates to a predetermined rotation position and the great 141 reaches the uppermost position.

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

In order to generally control the processing of the corrugated cardboard sheet SH in the corrugated cardboard sheet making machine 1, the upper management device 200 and the lower management device 210 are provided. In the present embodiment, the host 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 control command information regarding the sheet transfer speed, the dimensions of the corrugated cardboard sheet SH, the processing quantity, and the like to the lower management device 210 for each order.

The lower management device 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 device 200, counts the processing quantity of the corrugated cardboard sheet SH, and sends it to the upper management device 200. It is a device that manages and controls. The lower management device 210 is connected to the program memory 220 and the working memory 230, and together with these memories, constitutes a computer that controls the corrugated cardboard sheet box making machine 1. The program memory 220 includes a control program that controls the entire corrugated cardboard sheet making machine 1, a pattern creation program for creating a great order elevating pattern according to the sheet length and the feeding mode of each order, and a predetermined set value. It is a memory that fixedly stores such things.

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

FIG. 7A shows the product height determination threshold value according to the present embodiment. The stacking height determination threshold is a speed control pattern (roller control pattern) for controlling the rotation speeds of the roller motors 90, 91, 102, 103 in the cardboard sheet feeding device 2, and particularly, the feeding rollers 124 to 127 are stopped rotating. It is a threshold used for determining the stacking height of the cardboard sheet SH on the feeding table 20 of the cardboard sheet feeding device 2 in order to change the speed control pattern of the acceleration region for accelerating from the state. As shown in FIG. 7A, the program memory 220 stores a correspondence table in which the stack height determination thresholds are associated with each of the various flutes (A flute, B flute, etc.) of the corrugated cardboard sheet SH. ing. Such a stack height determination threshold is a speed control pattern of an acceleration region to be applied when the stack height of the 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 value suitable for each of the plurality of flutes in the corrugated cardboard sheet SH. Basically, the product height determination threshold is set to a smaller value as the flute is thinner. In one example, for the A flute, the stack height determination threshold is set to 70 mm, for the B flute (thinner than the A flute), the stack height determination threshold is set to 50 mm, and for the C flute (thinner than the A flute). , B thicker than the B flute), the stack height determination threshold is set to 60 mm. The reason why the product height determination threshold is made smaller as the flute is thinner is as follows.

As the stacking height of the corrugated cardboard sheet SH on the feeding table 20 becomes lower, the weight applied to the corrugated cardboard sheet SH of the lowermost layer on the feeding table 20 becomes smaller, and the frictional force applied to the corrugated cardboard sheet SH becomes smaller. (Load) becomes smaller. As a result, the feeding timing from the corrugated cardboard sheet feeding device 2 is advanced, so that the corrugated cardboard sheet SH fed by the corrugated cardboard sheet feeding device 2 causes a lead deviation (conveyance deviation) in the feeding direction FD. The stack height of the sheet pile is applied to the stack height determination threshold value so that an unacceptable amount of lead shift occurs with respect to such a lead shift. That is, the stack height determination threshold value is used to determine that the stack height of the corrugated cardboard sheet SH on the feed table 20 has decreased to a stack height that causes an unacceptable advance deviation. Here, the thinner the flute, the higher the density of the paper, so that the total weight of the sheet becomes heavier than the stacking height. When the weight applied to the corrugated cardboard sheet SH of the lowest layer is the same, the thin flute has a lower stack height than the thick flute. Therefore, the thinner the flute, the lower the weight applied to the corrugated cardboard sheet SH of the lowermost layer unless the stacking height is lowered, so that the stacking height when an unacceptable advance deviation occurs is lowered. Therefore, as described above, the thinner the flute, the smaller the stack height determination threshold is set.

Further, FIG. 7B shows a shift amount set value according to the present embodiment. The shift amount setting value is the speed in the acceleration region for accelerating the feeding rollers 124 to 127 in order to eliminate the advance deviation that occurs when the stack height of the corrugated cardboard sheet SH becomes less than the stack height determination threshold value as described above. This is a setting value for changing the control pattern. This set value corresponds to the degree to which the speed control pattern in the acceleration region is changed, and the amount of advance deviation of the corrugated cardboard sheet SH (the corrugated cardboard sheet SH sent out from the corrugated cardboard sheet feeding device 2 is at a desired position in the feeding direction FD ( It is the length that is advanced with respect to the correct position), typically a length of 5 mm or less). That is, the shift amount set value is used to cancel the advance shift amount that would occur if the set value is not applied by changing the speed control pattern in the acceleration region by an amount corresponding 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 (A flute, B flute, etc.) of the corrugated cardboard sheet SH. There is.

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

Returning to FIG. 6, the working memory 230 temporarily stores various information and arithmetic processing results sent from the host management device 200 when the control program is executed, and also includes a feed mode designation signal from the operation panel 240. It is a memory that temporarily stores.

The lower management device 210 is connected to the operation panel 240. The 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 feed button 241 is operated to start feeding the corrugated cardboard sheet SH by the corrugated 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 executing order. The feed mode designation key 243 is operated to specify a feed mode of either a single feed mode or a two 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 delivery mode. The operation panel 240 is configured as a touch panel capable of displaying various information by the information display unit 244 and receiving 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.

In addition, the information display unit 244 displays a setting screen for causing the operator to input the above-mentioned stack height determination threshold value and shift amount setting value. Here, an example of a screen for setting the product height determination threshold value and the shift amount setting value according to the embodiment of the present invention will be described with reference to FIG. In the setting screen shown in FIG. 8, the shift amount setting value and the stack height determination threshold are set for each flute of the corrugated cardboard sheet SH, for example, for each of A flute, B flute, C flute, AB flute, E flute, and CB flute. You can do it. Specifically, the operator can set each of the shift amount setting value and the product height determination threshold value by touching the screen. 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 filled in and shown. Such an initial value is changed by the operator touching the screen, that is, the shift amount setting value in which the initial value is changed is applied. In this way, the product height determination threshold value and the shift amount setting value input using the setting screen are stored in the program memory 220 and read out by the lower management device 210.

Basically, the program memory 220 stores in advance the product height determination threshold and the shift amount set value suitable for each of the plurality of flutes as initial values, but as described above. By using various setting screens, the operator can appropriately change the stacking height determination threshold value and the shift amount setting value from the initial values. As a result, an appropriate stacking height determination threshold value and shift amount setting value can be set according to the judgment of the operator, so that the occurrence of advance deviation caused by the change in the stacking height of the corrugated cardboard sheet SH is effectively suppressed for various orders. become able to. It should be noted that such setting (change) of the product height determination threshold value and the shift amount setting value can be performed not only before the order production but also during the order production.

Further, in the order performed for the first time, basically, the above-mentioned initial values are set for each of the product height determination threshold value and the shift amount setting value. When the product height determination threshold value and the shift amount set 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 product height determination threshold value and the shift amount set value changed in a certain order in association with the order information related to this order. When this order is performed next time (second and subsequent orders), the product height determination threshold value and the shift amount set value stored in this way are automatically set. Further, the stored height determination threshold value 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, the product height determination threshold value and the shift amount set value changed in this order are stored in association with the order information. The shift amount setting value (basically, the value stored in the first order) may be updated. However, when different orders are placed, the initial value for the order is the product 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. It is set for each of the default judgment threshold and the shift amount setting value. In particular, the product height determination threshold value and the shift amount setting value are set according to the flute, but even if the flutes are the same, if the order is different, the product height determination threshold value and the shift amount used in another order are used. Do not apply the quantity setting value.

Returning to FIG. 6, the lower control device 210 is connected to the drive control device 250, the print control device 251, the crease slotter control device 252, the die cutter control device 253, and the roller motor control device 254, respectively. The drive control device 250 controls the drive and stop of the main drive motor MT and its rotation speed according to the control command information from the lower management device 210. The rotation speed of the main drive motor MT is controlled according to the sheet transfer speed in the control command information. The print control device 251 controls the operations of the print units 30 and 31 according to the control command information from the lower management device 210. The cleaner slotter control device 252 controls the operation of the cleaner unit 40 and controls the operations of the slotter units 41 and 42 according to the control command information from the lower management device 210. The die cutter control device 253 controls the operation of the die cutter 5 according to the control command information from the lower management device 210.

The rotation position sensor 190 is connected to the lower management device 210. When the feed button 241 is operated, the lower management device 210 sends control command information including a feed start command to the roller motor control device 254. Further, the lower management device 210 sends control command information including a synchronization command to the roller motor control device 254 each time it receives a detection signal from the rotation position sensor 190 after sending the feed start command. Further, the stack height detection sensor 195 is connected to the lower management device 210, and the detection signal (the signal corresponding to the stack height of the cardboard sheet SH on the feeding table 20) by the stack height detection sensor 195 is the lower management device 210. Is entered in.

It should be noted that the product height determination threshold is not limited to be used for each flute as described above, and a product height determination threshold common to all flutes may be used. In that case, the product height is supported. Instead of the product height detection sensor 195 that outputs the signal to be output, a sensor having a specification that switches between an on signal and an off signal with a set product height determination threshold as a boundary may be used.

The roller motor control device 254 controls a series of operations of the motion controller 260 according to the control command information from the lower management device 210. A pattern number setting memory 255 is connected to the roller motor control device 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 rotation speeds of the roller motors 90, 91, 102, 103, and the pattern number setting memory 255 stores the shift amount setting value and the roller control to be applied. The correspondence table between the pattern management number (roller control pattern number) and the pattern management number (roller control pattern number) is stored.

Here, the roller control pattern number and the roller control pattern will be specifically described with reference to FIGS. 9A and 9B. FIG. 9A shows the roller control pattern number 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 predetermined shift amount setting values. Specifically, the pattern number setting memory 255 contains four shift amount setting values of 0, 1, 2, and 3 mm, and roller control pattern numbers 0 to 3 associated with these shift amount setting values. Memorize the correspondence table of.

FIG. 9B shows a roller control pattern stored in the roller control pattern memory 261. As shown in FIG. 9B, the roller control pattern memory 261 stores the 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 rotation speeds of the roller motors 90, 91, 102, 103, and in this speed control pattern, with respect to the mechanical rotation angle (rotation angle of the printing cylinders 30A, 31A). Therefore, the ratio (speed ratio) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds of the printing 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 roller control pattern numbers 0 to 3. The roller control pattern No. 0 corresponding to the shift amount set value of 0 mm is a basic roller control pattern that serves as a reference for the other three types of roller control patterns. On the other hand, in the roller control pattern numbers 1 to 3 corresponding to the shift amount set values 1 to 3 mm, the change in the weight of the sheet pile of the corrugated cardboard sheet SH laminated on the feeding table 20 (in other words, the stack height). This is a pattern in which the basic roller control pattern is changed in order to keep the feeding timing constant regardless of the change in corrugated cardboard. As schematically shown in FIG. 9B, in the roller control patterns Nos. 1 to 3 of the roller control pattern numbers, the timing at which the feeding rollers 124 to 127 start to rotate rather than the basic roller control pattern, that is, the feeding The timing for starting the acceleration of the rollers 124 to 127 (acceleration start timing) is delayed. Specifically, the larger the number of roller control pattern numbers, that is, the larger the shift amount set value, the later the acceleration start timing of the feeding rollers 124 to 127. When the stacking height of the corrugated cardboard sheet SH on the feeding table 20 becomes low and the feeding timing becomes earlier, the control is performed so as to delay the acceleration start timing in this way, as a result. The feeding timing at which the rear end of the corrugated cardboard sheet SH of the lowermost layer comes out of the corrugated cardboard sheet feeding device 2 can be made substantially the same as when the stacking height of the corrugated cardboard sheet SH is relatively high.

Returning to FIG. 6, when the lower management device 210 receives the control command information for preparing the execution of the machining order from the upper management device 200, the lower management device 210 issues an order preparation command to the roller motor control device 254. Send control command information including. When the roller motor control device 254 receives the control command information including the order preparation command from the lower management device 210, the roller motor control device 254 reads the roller control pattern number from the pattern number setting memory 255 and transmits the roller control pattern number to the motion controller 260. send. In particular, the roller motor control device 254 has a product height determination threshold and a shift amount set value (value corresponding to the flute of the cardboard sheet SH currently used) and a product detected by the product height detection sensor 195. The height is acquired via the lower management device 210, and if the product height is equal to or greater than the product height determination threshold value, 0 is sent to the motion controller 260 as the roller control pattern number, and the product height is determined. When it is less than the threshold value, the roller control pattern number (any of 1 to 3) corresponding to the shift amount set value is sent to the motion controller 260. Further, the roller motor control device 254 sends a motion start command to the motion controller 260 in accordance with a feed start command or a synchronization command in the control command information from the lower management device 210.

The motion controller 260 has a built-in motion CPU and is connected to the program memory 262. The program memory 262 stores in advance a pattern creation program or the like for creating a speed control command. The motion controller 260 refers to the roller control pattern memory 261 and reads out the roller control pattern corresponding to the roller control pattern number sent from the roller motor control device 254. Then, the motion controller 260 creates a speed control command using the pattern creation program stored in the program memory 262 based on the sheet transfer speed sent from the lower management device 210 and the read roller control pattern. It is sent to the drive control circuit 264. For example, this 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. When the motion controller 260 receives the motion start command from the roller motor control device 254, the motion controller 260 sends the speed control command to the drive control circuit 264. The basic configuration of the motion controller 260 is disclosed in JP-A-2006-7239, JP-A-11-272312, JP-A-5-50329, and the like, and is generally known. Omit.

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

The lower 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 great basic elevating pattern memory 270 and the great order elevating pattern memory 271 are connected to the lower management device 210, respectively. In order to control the rotation speed of the elevating motor 80, the great basic elevating pattern memory 270 has a great basic elevating pattern predetermined according to the minimum sheet length for the one-sheet feeding mode and a one-sheet feeding mode. Great basic elevating pattern predetermined according to the maximum seat length for, and a great basic elevating pattern predetermined according to the minimum seat length for the two-sheet feeding mode, and a two-sheet feeding mode. The great basic elevating pattern, which is predetermined according to the maximum seat length, is stored for each. The great order elevating pattern memory 271 temporarily stores the great order elevating pattern.

When the lower management device 210 receives the control command information for preparing the execution of the machining order from the upper management device 200, the lower management device 210 executes the pattern creation program stored in the program memory 220. By executing the pattern creation program, the lower management device 210 has the sheet length of the machining order based on the great basic elevating pattern of any of the four great basic elevating patterns described above stored in the great basic elevating pattern memory 270. A great order elevating pattern is created according to the above, and temporarily stored in the great order elevating pattern memory 271. After that, the lower management device 210 reads the great order elevating pattern from the great order elevating pattern memory 271 and generates a pattern creation command. The pattern creation command includes the sheet transfer speed in the control command information from the host management device 200 and the great order elevating pattern.

When the feed button 241 is operated, the lower management device 210 receives the feed start signal from the operation panel 240, and sends control command information including the feed start command to the motion controller 280 as a motion start command. Further, the lower management device 210 sends the control command information including the synchronization command to the motion controller 280 as a motion start command each time the detection signal is received from the rotation position sensor 190 after the feed start command is sent.

The motion controller 280 is connected to the lower management device 210. The motion controller 280 has a built-in motion CPU and is connected to a program memory 281 for 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 ascending / descending speed control pattern. The great speed control pattern memory 282 temporarily stores the great ascending / descending speed control pattern created by the motion controller 280. The great elevating speed control pattern includes a series of numerous speed control commands to command the rotational speed of the elevating motor 80. The motion controller 280 executes the pattern creation program when it receives the pattern creation command from the lower management device 210. By executing the pattern creation program, the motion controller 280 creates a great elevating speed control pattern based on the sheet transport speed and the great order elevating pattern during the pattern creation command, and temporarily stores the great elevating speed control pattern in the great speed control pattern memory 282.

When the motion controller 280 receives the motion start command from the lower management device 210, the motion controller 280 reads each speed control command from the control pattern memory 282 at a predetermined control cycle and sends it to the drive control circuit 283. The predetermined control cycle is, for example, 1 msec, and even when the sheet transfer speed is set to the highest sheet transfer speed in the corrugated cardboard sheet box making machine 1, the motion controller 280 reliably reads out the speed control command and the like. It is a period that can be executed. The basic configuration of the motion controller 280 is the same as that of the motion controller 260.

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

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

FIG. 10 is an explanatory diagram of a basic roller control pattern which is a first example of a roller control pattern according to an embodiment of the present invention. In FIG. 10, the horizontal axis shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds of the printing cylinders 30A and 31A. Is shown. The basic roller control pattern is a reference speed control pattern applied when the stacking height of the corrugated cardboard sheet SH on the feeding table 20 is equal to or larger than the stacking height determination threshold value. 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, which is common to various roller control patterns, will be described. As shown in FIG. 10, the speed control pattern P1 as the roller control pattern causes the feeding rollers 124 to 127 from rotating stopped. An acceleration region R11 for accelerating, a constant speed region R12 for rotating the feeding rollers 124 to 127 at a constant speed after the acceleration region R11, and a feeding roller 124 to 127 after the constant speed region R12. A deceleration region R13 for decelerating the rotation of the feed roller 124 to 127 and a stop region R14 for stopping the rotation of the feeding rollers 124 to 127 after the deceleration region R13 are included. In the basic roller control pattern shown in FIG. 10, the acceleration region R11 is in the range of 0 ° to 65 °, the constant speed region R12 is in the range of 65 ° to 196 °, and the deceleration region R13 is in the range of 196 ° to 226 °. It is a range, and the stop region R14 is in the range of 226 ° to 360 °.

Next, FIG. 11 is an explanatory diagram of a second example of the roller control pattern according to the embodiment of the present invention. Also in FIG. 11, the horizontal axis shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds of the printing cylinders 30A and 31A. Is shown. The roller control pattern according to the second example is applied when the stacking height of the corrugated cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold value, and is applied to the above-mentioned basic roller control pattern (first). This is a speed control pattern in which the roller control pattern (roller control pattern according to the example of) is changed. 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 set 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 on the right side as a whole with respect to the acceleration region R11 (indicated by a broken line) of the basic roller control pattern. It's 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 °, and this rotation angle is the rotation 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 °, and this rotation angle is the rotation which is the end position of the acceleration region R11 in the basic roller control pattern. The angle is larger than 65 °. Regarding the configuration other than the acceleration region, the roller control pattern according to the second example is the same as the basic roller control pattern.

According to the roller control pattern according to 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 corrugated cardboard sheet SH is delayed. On the other hand, the roller control pattern according to the second example is applied in a situation where the stack height of the corrugated cardboard sheet SH on the feed table 20 is less than the stack height determination threshold. The weight applied to the uppermost corrugated cardboard sheet SH becomes smaller, and the frictional force applied to the corrugated cardboard sheet SH becomes smaller, so that the feeding timing from the corrugated cardboard sheet feeding device 2 tends to be earlier. Therefore, in such a situation, the roller control pattern according to the second example in which the basic roller control pattern is changed as described above is applied to control the corrugated cardboard sheet SH so as to delay the acceleration start timing. Therefore, it is possible to prevent the corrugated cardboard sheet feeding device 2 from accelerating the feeding timing. That is, it is possible to offset the fact that the feeding timing is advanced due to the reduction of the frictional force applied to the corrugated cardboard sheet SH of the lowermost layer by delaying the acceleration start timing of the corrugated 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 value, it is possible to realize substantially the same feeding timing as when the stacking height is equal to or more than the stacking height determination threshold value. become. Therefore, it is possible to appropriately suppress the advance deviation caused by the change in the weight of the corrugated cardboard sheet SH laminated on the feeding table 20.

In addition, in order to delay the acceleration start timing and appropriately eliminate the advance deviation of a predetermined amount (corresponding to the shift amount set value and the above-mentioned +1 mm, +2 mm, +3 mm), the rotation angle based on the start position of the acceleration region R11a is used as a reference. The amount (angle) to be increased from 0 ° can be basically uniquely obtained from the diameter Dp of the printing cylinders 30A and 31A. Therefore, for each of the shift amount set values of +1 mm, +2 mm, and +3 mm, the amount at which the start position of the acceleration region R11a should be increased from the rotation angle of 0 ° is obtained in advance, and roller control is performed for each of these shift amount set values. The pattern can be specified. Basically, the amount by which the start position of the acceleration region R11a should be increased from the rotation angle of 0 ° increases as the shift amount set value increases. As described above, when the shift amount set value is +3 mm, the rotation angle at the start position of the acceleration region is 0.86 °, but when the shift amount set value is + 1 mm, the start of the acceleration region is started. The rotation angle at the position is 0.28 °, and when the shift amount set value is + 2 mm, the rotation angle at the start position of the acceleration region is 0.57 °. The amount of shifting the start position of the acceleration region from the rotation angle of 0 ° according to the shift amount set value corresponds to an example of the “feed adjustment amount” in the present invention.

On the other hand, when the roller control pattern according to the second example as described above is applied to delay the acceleration start timing of the feeding rollers 124 to 127 of the corrugated cardboard sheet feeding device 2, the great of the corrugated cardboard sheet feeding device 2 is delayed. The operation of 141 does not need to be changed from the normal time. This will be described with reference to FIG.

FIG. 12 is an explanatory diagram of the operation of the Great 141 when the second example of the roller control pattern according to the embodiment of the present invention is applied. In FIG. 12, the horizontal axis shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds of the printing cylinders 30A and 31A. And the height of the Great 141, and the roller control pattern according to the second example and the operation of the Great 141 are shown 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 great 141 in which the feeding rollers 124 to 127 and the corrugated cardboard sheet SH come into contact with each other.

When the start position of the acceleration region R11a is shifted to the right as in the roller control pattern according to the second example, the rotation start timing of the feeding rollers 124 to 127 is delayed, and the corrugated cardboard sheet SH is fed by the feeding rollers 124 to 127. The distance will be shorter, but there will be no particular problem. This is because even when the maximum shift amount setting value of +3 mm is applied and the start position of the acceleration region R11a is shifted to the rightmost position, after the tip of the corrugated cardboard sheet SH reaches the feed rolls 23 and 24 ( In FIG. 12, the rotation angle θ ₁ indicates the timing when the tip of the corrugated cardboard sheet SH reaches the feed rolls 23 and 24), and the contact between the feeding rollers 124 to 127 and the corrugated cardboard sheet SH is blocked by the great 141. Is. In this case, the corrugated cardboard sheet SH can be reliably delivered to the feed rolls 23 and 24.

On the other hand, while the corrugated cardboard sheet feeding device 2 is feeding one corrugated cardboard sheet SH, the stack height detected by the stack height detection sensor 195 is equal to or higher than the stack height determination threshold value. It may change to a state of being less than the determination threshold, but in this case, the roller control pattern applied to feed the corrugated cardboard sheet SH is not changed. This will be described with reference to FIG.

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

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 value, the basic roller control pattern as shown by reference numeral P10 is applied. Then, in the middle of the cycle cy2 after the cycle cy1, the product height changes from the product height determination threshold value or more to less than the product height determination threshold value, but in the present embodiment, in the cycle cy2, the product height changes. 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 0 to any number 1 to 3 at time t1, but the motion controller 260 changes the number of the cycle cy2. The basic roller control pattern P10 corresponding to the 0th roller control pattern number received from the roller motor control device 254 at the start is continuously applied in the cycle cy2. By doing so, it is possible to prevent an excessive load from being applied to the roller motors 90, 91, 102, and 103 by changing the roller control pattern applied in the middle of the cycle. Then, in the cycle cy3 next to the cycle cy2, the motion controller 260 applies the roller control pattern P11 corresponding to the roller control pattern number of any number 1 to 3 received from the roller motor control device 254 from the time t1. To do. That is, the motion controller 260 changes the applied roller control pattern from the basic roller control pattern P10 to the roller control pattern P11 in the cycle cy3. As described above, in the present embodiment, the applied roller control pattern is changed in one cycle cycle.

[Action effect]
Next, the operation and effect of the corrugated 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 laminated on the feeding table 20 is continuously sent out by the corrugated cardboard sheet feeding device 2, the weight of the corrugated cardboard sheet SH laminated on the feeding table 20 becomes small. As a result, the frictional force (load) applied to the corrugated cardboard sheet SH in the lowermost layer tends to be reduced, so that the feeding timing of the corrugated cardboard sheet SH by the corrugated cardboard sheet feeding device 2 tends to change, particularly feeding. The delivery timing tends to be earlier. As a result, the position of the corrugated cardboard sheet SH delivered by the corrugated cardboard sheet feeding device 2 in the transport direction is not constant. That is, with respect to the corrugated cardboard sheet SH sent out by the corrugated cardboard sheet feeding device 2, the position shift (transport shift) in the transport direction occurs. Specifically, when the weight of the corrugated cardboard sheet SH on the feeding table 20 is small, the feeding timing is earlier than when the weight of the corrugated cardboard sheet SH on the feeding table 20 is large, so that the corrugated cardboard sheet SH is transported. A relatively advanced state (advance deviation) occurs in the direction.

Therefore, in the present embodiment, the feeding table 20 is set so that the feeding timing becomes constant regardless of the change in the weight of the corrugated cardboard sheet SH on the feeding table 20 while executing one order production. The speed control pattern (roller control pattern) in the acceleration region is changed based on the stacking height of the corrugated cardboard sheet SH on the feeding table 20 corresponding to the weight of the corrugated cardboard sheet SH above. Thereby, the transport deviation (advance deviation) of the corrugated cardboard sheet SH due to the change in the weight of the corrugated cardboard 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 the acceleration of the corrugated cardboard sheet SH is started, the feeding timing can be appropriately and constantly maintained regardless of the change in the weight of the corrugated cardboard sheet SH on the feeding table 20. Will be. Further, since the acceleration start timing is changed while maintaining the same magnitude of acceleration, slippage of the corrugated cardboard sheet SH on the feeding rollers 124 to 127 can be suppressed. That is, when the acceleration is increased, the corrugated cardboard sheet SH tends to slip on the feeding rollers 124 to 127, but such slip can be suppressed by keeping the magnitude of the acceleration the same. Therefore, stable delivery by the corrugated cardboard sheet feeding device 2 can be ensured.

Further, in the present embodiment, when the weight of the corrugated cardboard sheet SH on the feeding table 20 becomes smaller, the feeding timing is earlier, so that the stacking height related to the weight of the corrugated cardboard sheet SH on the feeding table 20 can be determined. Using the threshold value (stack height determination threshold), when the stack height is less than the stack height determination threshold, the timing for starting the acceleration of the corrugated board sheet SH is set as compared with the case where the stack height is greater than or equal to the stack height determination threshold. Delay. As a result, the feeding timing can be effectively kept constant regardless of the change in the weight of the corrugated cardboard sheet SH on the feeding table 20.

Here, in the thin flute corrugated cardboard sheet SH, the density of the corrugated cardboard sheet SH is higher than that in the thick flute corrugated cardboard sheet SH, so that the weight of the corrugated cardboard sheet SH on the feeding table 20 is reduced. The time when the delivery timing is early tends to be relatively late. Therefore, in the present embodiment, the thinner the flute of the corrugated cardboard sheet SH, the smaller the stack height determination threshold. As a result, since the stacking height determination threshold value is set according to the flute of the corrugated cardboard sheet SH, it is possible to appropriately prevent the occurrence of transport deviation for the corrugated cardboard sheet SH of various flutes.

Further, in the present embodiment, in the middle of one cycle cycle in which one cardboard sheet SH is sent out, the stack height changes from a state where the stack height is equal to or higher than the stack height determination threshold value to a state where the stack height is less than the stack height determination threshold value. However, the speed control pattern applied in this cycle cycle is not changed. As a result, it is possible to prevent an excessive load from being applied to the roller motors 90, 91, 102, 103 that rotationally drive the feeding 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 corrugated cardboard sheet SH on the feeding table 20, so this is taken into consideration. Therefore, the amount of delaying the timing of starting the acceleration of the corrugated cardboard sheet SH (that is, the shift amount set value) is changed. As a result, the feeding timing can be effectively kept constant regardless of the change in the weight of the corrugated cardboard sheet SH on the feeding table 20.

Here, since the density of the corrugated cardboard sheet SH of the thin flute is higher than that of the corrugated cardboard sheet SH of the thick flute, the corrugated cardboard sheet SH is on the feeding table 20 when the feeding work of the corrugated cardboard sheet SH progresses. The amount of change in the weight of the corrugated cardboard sheet SH becomes large, and the degree to which the feeding timing is advanced becomes large. Therefore, in the present embodiment, the thinner the flute of the corrugated cardboard sheet SH, the larger the shift amount set value. As a result, since the shift amount setting value is set according to the flute of the corrugated cardboard sheet SH, it is possible to appropriately prevent the occurrence of transport deviation for the corrugated cardboard sheet SH of various flutes.

Further, in the present embodiment, by storing a plurality of speed control patterns (roller control patterns) according to the shift amount set value in advance, the speed control pattern according to the shift amount set value is quickly applied. At the same time, 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 value and the shift amount according to the order specifications. Can be changed as appropriate. As a result, it is possible to appropriately cope with various order specifications.

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

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

[Modification example]
Next, a modified example of the above-described embodiment will be described. In addition, a plurality of modifications shown below can be carried out in combination with each other as appropriate.

(Modification example 1)
In the above-described embodiment, the timing for starting the acceleration of the corrugated cardboard sheet SH (acceleration start timing) is changed based on the stacking height of the corrugated cardboard sheet SH on the feeding table 20, but in the modified example, the acceleration start timing is changed. The magnitude of the acceleration when accelerating the corrugated cardboard sheet SH may be changed instead of changing. Even in such a modification, a plurality of roller control patterns (FIG. 10) for changing the magnitude of acceleration applied to the corrugated cardboard sheet SH with respect to each of the above-mentioned shift amount setting values (0, +1, +2, +3 mm). 4 types of roller control patterns including the basic roller control patterns shown in the above) may be prepared.

FIG. 14 is an explanatory diagram of a third example of a roller control pattern, which is a modified example of the embodiment of the present invention. In FIG. 14, the horizontal axis shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds 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 stacking height of the corrugated cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold value, and the shift amount setting value is +3 mm. It is applied at one 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 region R11b (shown by a solid line) is based on the inclination of the acceleration region R11 (shown by a broken line) of the basic roller control pattern (see FIG. 10). Is also gradual. That is, the acceleration in the acceleration region R11b is smaller than the acceleration in the acceleration region R11. Specifically, in the roller control pattern according to the third example, the start position of the acceleration region R11b is a rotation angle of 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 a rotation angle of 66.69 °, which is larger than the rotation angle of 65 °, which is the end position of the acceleration region R11 of the basic roller control pattern (that is, the acceleration end). The timing is late). Here, an example is shown when the shift amount set value is +3 mm, but when the shift amount set value is +2 mm, the rotation angle at the end position of the acceleration region is 66.17 °, and the shift amount is shifted. When the quantity set value is + 1 mm, the rotation angle at the end position of the acceleration region is 65.56 °. The amount of shifting the rotation angle at the end position of the acceleration region according to such a shift amount set value (amount of shifting from 65 °) corresponds to an example of the "feeding 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 corrugated cardboard sheet SH from the rotation stopped state becomes small. On the other hand, the roller control pattern according to the third example is applied in a situation where the stack height of the corrugated cardboard sheet SH on the feed table 20 is less than the stack height determination threshold. The weight applied to the uppermost corrugated cardboard sheet SH becomes smaller, and the frictional force applied to the corrugated cardboard sheet SH becomes smaller, so that the feeding timing from the corrugated cardboard sheet feeding device 2 tends to be earlier. 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, and the control is performed so as to reduce the acceleration when accelerating the corrugated cardboard sheet SH. As a result, it is possible to prevent the corrugated cardboard sheet feeding device 2 from accelerating the feeding timing. That is, as the frictional force applied to the corrugated cardboard sheet SH of the lowermost layer is reduced, the acceleration when accelerating the corrugated cardboard sheet SH is reduced, and the corrugated cardboard sheet SH of the lowermost layer is compared with the feeding rollers 124 to 127. By reducing the force (conveying force) applied to the feeding direction FD, it is possible to eliminate the fact that the frictional force applied to the corrugated cardboard sheet SH of the lowermost layer is reduced and the feeding timing is accelerated. Therefore, when the stacking height of the cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold value, it is possible to realize substantially the same feeding timing as when the stacking height is equal to or more than the stacking height determination threshold value. become. Therefore, it is possible to appropriately suppress the advance deviation caused by the change in the weight of the corrugated cardboard sheet SH laminated on the feeding table 20.

Further, in this modification, since the magnitude of acceleration is changed while maintaining the same acceleration start timing, the corrugated cardboard sheet SH of the lowest layer falls on the feeding rollers 124 to 127 during acceleration and slips. Can be suppressed. That is, when the acceleration start timing is advanced, the acceleration of the feeding rollers 124 to 127 starts before the corrugated cardboard sheet SH of the lowermost layer comes into contact with the feeding rollers 124 to 127, and the corrugated cardboard sheet SH of the lowermost layer starts to accelerate the feeding rollers 124 to 124. There is a possibility of slipping when it comes into contact with ~ 127, but if the acceleration start timing is kept the same, the timing at which the bottom layer corrugated cardboard sheet SH contacts the feeding rollers 124 to 127 and the acceleration of the feeding rollers 124 to 127 Since the difference from the timing at which is started is kept constant, such slip can be suppressed. Therefore, stable delivery by the corrugated cardboard sheet feeding device 2 can be ensured.

In the above-described embodiment, the amount of deviation of the rotation angle at the end position of the acceleration region from the reference rotation angle of 65 ° is used as the “feeding adjustment amount”, but instead, the ratio of the magnitudes of acceleration is used. (Ratio of the slope of the straight line in the acceleration region) may be used as the "feed adjustment amount". For example, when the shift amount set value is 0 mm, the slope of the straight line in the acceleration region is about 1.538 (≈100/65), and when the shift amount set value is +1 mm, the slope of the straight line in the acceleration region is about 1.538 (≈100/65). Approximately 1.525 (≈100 / 65.56), and when the shift amount set value is +2 mm, the slope of the straight line in the acceleration region is approximately 1.511 (≈100 / 66.17), and the shift amount set value. When is + 3 m, the slope of the straight line in the acceleration region is about 1.499 (100 / 66.69). In this case, based on the slope of the straight line in the acceleration region when the shift amount set value is 0 mm, the ratio of the slope of the straight line in the acceleration region when the shift amount set value is +1 mm is about 0.99 (≈1). .525 / 1.538), and the ratio of the slope of the straight line in the acceleration region when the shift amount set value is +2 mm is about 0.98 (≈1.511 / 1.538), and the shift amount set value is +3 mm. In this case, the ratio of the slopes of the straight lines in the acceleration region is about 0.97 (≈1.499 / 1.538). The ratio of the slopes of the straight lines in the acceleration region can be used as the "feed adjustment amount".

Further, in the above-described embodiment, only the acceleration start timing of the corrugated cardboard sheet SH is changed, while in this modification, only the magnitude of acceleration when accelerating the corrugated cardboard sheet SH is changed. In a further modification, both the acceleration start timing of the corrugated cardboard sheet SH and the magnitude of the acceleration of the corrugated cardboard sheet SH may be changed. That is, the timing at which the acceleration of the corrugated cardboard sheet SH is started may be delayed, and the magnitude of the acceleration when accelerating the corrugated cardboard sheet SH may be reduced.

(Modification 2)
In the above embodiment, the present invention is applied to the one-sheet feeding mode, but in the modified example, 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 can also be applied to the two-sheet feeding mode.

First, a basic roller control pattern applied in the two-sheet feeding mode will be described with reference to FIG. FIG. 15 is an explanatory diagram of a basic roller control pattern which is a fourth example of a roller control pattern according to a modified example of the embodiment of the present invention. In FIG. 15, the horizontal axis shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds of the printing cylinders 30A and 31A. Is shown. The basic roller control pattern is a reference speed control pattern applied when the stacking height of the corrugated cardboard sheet SH on the feeding table 20 is equal to or greater than the stacking height determination threshold value in the two-sheet feeding mode. Specifically, this basic roller control pattern is applied when the shift amount set 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 consists of two corrugated cardboard sheets fed while the printing cylinders 30A and 31A make one rotation. The speed control pattern P3 for applying to the preceding sheet (odd-numbered corrugated cardboard sheet SH) of the SH, and the succeeding sheet (even-numbered corrugated cardboard) of the two corrugated cardboard sheets SH. Includes a speed control pattern P4 for application to the sheet SH). The speed control patterns P3 and P4 are the acceleration regions R31 and R41 for accelerating the feed rollers 124 to 127 from the rotation stopped state, respectively, and the feed rollers 124 to after the acceleration regions R31 and R41, respectively. Constant speed regions R32 and R42 for rotating 127 at a constant speed, deceleration regions R33 and R43 for decelerating the rotation of the feeding rollers 124 to 127 after the constant speed regions R32 and R42, and these deceleration regions. Includes stop areas R34, R44 for stopping the rotation of the feed rollers 124 to 127 after R33, R43.

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

FIG. 16 is an explanatory diagram 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 shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds 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 corrugated cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold value in the two-sheet feeding mode, and is applied as described above. This is a speed control pattern obtained by changing the basic roller control pattern (roller control pattern according to the fourth example). Specifically, the roller control pattern according to the fifth example is applied when the shift amount set value is +3 mm.

As shown in FIG. 16, in the roller control pattern according to the fifth example, both the speed control pattern P3 for the odd-numbered corrugated cardboard sheet SH and the speed control pattern P4 for the even-numbered corrugated cardboard sheet SH. , The acceleration regions R31a and R41a (indicated by the solid line) are shifted to the right as a whole with respect to the acceleration regions R31 and R41 (indicated by the broken line) 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-third cardboard sheet SH, the start position of the acceleration region R31a is a 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 °. , The rotation angle is larger than the rotation angle of 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-th sheet cardboard sheet SH, the start position of the acceleration region R41a is a rotation angle of 180.86 °, and this rotation angle is the rotation angle of the acceleration region R41 in the basic roller control pattern. The rotation angle is larger than the start position of 180 °, and the end position of the acceleration region R41a is the rotation angle of 245.86 °. This rotation angle is the end of the 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 above, in the two-sheet feeding mode, the acceleration regions R31a and R41a of the speed control patterns P3 and P4 start from a relatively large rotation angle, so that the odd-numbered corrugated cardboard sheet SH In both the even-numbered corrugated cardboard sheet SH and the even-numbered corrugated cardboard sheet SH, the acceleration start timing is delayed. As a result, the control for delaying the acceleration start timing 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 stacking height determination threshold value and the feeding timing tends to be earlier. , It is possible to prevent the corrugated cardboard sheet feeding device 2 from accelerating the feeding timing. Therefore, according to the fifth example, for both the odd-numbered and even-numbered corrugated cardboard sheets SH delivered in the two-sheet feeding mode, the weight of the corrugated cardboard sheet SH laminated on the feeding table 20 changes. The resulting shift can be appropriately suppressed.

Next, with reference to FIG. 17, an example of further modification of this modified example will be described. The example shown in FIG. 17 corresponds to the above-mentioned "modification example 1". Specifically, FIG. 17 is an explanatory diagram 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 shows the rotation angles (°) of the printing cylinders 30A and 31A, and the vertical axis shows the speed ratio (%) of the peripheral speeds of the feeding rollers 124 to 127 to the peripheral speeds 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 corrugated cardboard sheet SH on the feeding table 20 is less than the stacking height determination threshold value in the two-sheet feeding mode, and is applied as described above. This is a speed control pattern obtained by changing the basic roller control pattern (roller control pattern according to the fourth example). Specifically, the roller control pattern according to the sixth example is applied when the shift amount set value is +3 mm.

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

According to the roller control pattern according to the sixth example above, both the odd-numbered corrugated cardboard sheet SH and the even-numbered corrugated cardboard sheet SH are applied when accelerating from the rotation stopped state in the two-sheet feeding mode. Acceleration becomes smaller. 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 stacking height determination threshold value and the feeding timing tends to be earlier. In addition, it is possible to prevent the corrugated cardboard sheet feeding device 2 from accelerating the feeding timing. Therefore, according to the sixth example, for both the odd-numbered and even-numbered corrugated cardboard sheets SH delivered in the two-sheet feeding mode, the weight of the corrugated cardboard sheet SH laminated on the feeding table 20 changes. The resulting shift can be appropriately suppressed.

(Modification example 3)
In the above-described embodiment, the stacking height determination threshold value and the shift amount setting value are set according to the flute of the corrugated cardboard sheet SH, but in the modified example, the dimensions of the corrugated cardboard sheet SH (hereinafter, simply referred to as "sheet dimensions"). The stack height determination threshold value and the shift amount setting value may be set according to (.). In particular, it is preferable to set the stacking height determination threshold value and the shift amount setting value according to both the flute and the sheet size of the corrugated cardboard sheet SH. The flute and sheet dimensions are examples of the "specifications" of the corrugated cardboard sheet SH.

With reference to FIGS. 18A and 18B, the product height determination threshold value and the shift amount setting value according to the modified example 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 value is associated with the flute and the sheet size of the corrugated cardboard sheet SH. Basically, the larger the sheet size, the smaller the stack height determination threshold value is set. The reason is as follows. The corrugated cardboard sheet SH is stacked on the feeding table 20 in a forward leaning posture, and the load is not uniformly applied to the entire upper surface of the bottom layer sheet, and the load is biased to the front side of the bottom layer sheet (Note, FIG. 1). Then, all the corrugated cardboard sheets SH on the feeding table 20 are shown in a horizontal posture, but in reality, the upper layer portion of the sheet pile on the feeding table 20 may be stacked in a forward leaning posture). Therefore, even if the flutes are the same, the load applied to the front side of the lowest layer sheet varies depending on the sheet size. Here, the larger the sheet size, the heavier the sheet weight per sheet, so that the total sheet weight with respect to the stacking height also becomes heavier. Therefore, the larger the sheet size, the lighter the load applied to the lowest layer sheet unless the stacking height is lowered. Therefore, the stacking height at which the lead deviation occurs becomes low. Therefore, as described above, the larger the sheet size, the smaller the stacking height determination threshold value is set.

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

As described above, by setting the stacking height determination threshold value and the shift amount setting value according to the sheet size of the corrugated cardboard sheet SH, it is possible to appropriately prevent the occurrence of transport deviation for the corrugated cardboard sheet SH of various dimensions.

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

Further, the product height determination threshold value and the shift amount setting value set in the correspondence table (matrix table) as described above can be appropriately changed by the operator operating the operation panel 240.

(Modification example 4)
In the above-described embodiment, the stacking height determination threshold value and the shift amount setting value are set according to the flute of the corrugated cardboard sheet SH, but in the modified example, the basis weight of the corrugated cardboard sheet SH (density of corrugated cardboard sheet SH (g / g /)). The product height determination threshold and the shift amount set value may be set according to (corresponding to m ² )). That is, the stacking height determination threshold value 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 "specifications" of the corrugated cardboard sheet SH.

In particular, it is preferable to set the stacking height determination threshold value and the shift amount setting value according to all of the flute, the sheet size, and the basis weight of the corrugated cardboard sheet SH. Since the base paper of the corrugated cardboard sheet SH has various basis weights such as 120, 160, 180, and 200 g / m ² , the weight of the corrugated cardboard sheet SH depends on the type of base paper, even if the flutes and dimensions are the same. Is changing. Specifically, the product height determination threshold value 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.

In this way, by setting the stacking height determination threshold value and the shift amount setting value according to the basis weight of the corrugated cardboard sheet SH, it is possible to appropriately prevent the occurrence of transfer deviation for the corrugated cardboard sheet SH having various basis weights.

(Modification 5)
In the above-described embodiment, four types of roller control patterns including the basic roller control pattern have been prepared, but more types of roller control patterns may be prepared. For example, roller control patterns for the standard size and the small size of the corrugated cardboard sheet SH may be created, and the roller control patterns may be used properly according to the sheet dimensions of the order. In this example, four types of roller control patterns including the basic roller control pattern may be prepared for the standard size, and four types of roller control patterns including the basic roller control pattern may be prepared for the small size. Further, the shift amount setting value is not limited to using the 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 above-described embodiment, a 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 set value is applied among the plurality of roller control patterns. .. In the modified example, instead of storing the plurality of roller control patterns created in advance in this way, 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 calculation formula for creating the roller control pattern, and the roller control pattern calculated according to this calculation formula is transmitted to the motion controller 260. send. The roller control pattern can be calculated from the shift amount set value, the diameter Dp of the printing cylinders 30A and 31A, and the like. In particular, the speed control pattern (acceleration start timing, acceleration end timing, acceleration magnitude, etc.) of the acceleration region applied to the corrugated cardboard sheet SH in the roller control pattern may be calculated based on the shift amount set value. According to such a modification, it is not necessary to store the roller control pattern, so that the storage capacity can be reduced.

(Modification 7)
In the above-described embodiment, the speed control pattern of the acceleration region to be applied is changed to two stages by determining the stack height of the corrugated sheet SH using one stack height determination threshold, but it is modified. In the example, the speed control pattern of the acceleration region to be applied may be changed to three or more stages by determining the stack height of the cardboard sheet SH using two or more stack height determination thresholds. For example, for the B flute, 50 mm may be used as the first threshold value of the product height determination threshold value, and 30 mm may be used as the second threshold value of the product height determination threshold value. In this case, +1 mm may be used as the shift amount setting value corresponding to the first threshold value, and +2 mm may be used as the shift amount setting value corresponding to the second threshold value. In this way, when the stack height is 50 mm or more and less than 50 mm, the roller control pattern is changed to the first roller control pattern, and when the stack height is 30 mm or more and less than 30 mm, the second roller control pattern is changed. It will be.

(Modification 8)
In the above embodiment, when the stacking height of the cardboard sheet SH changes from the stacking height determination threshold value or more to less than the stacking height determination threshold value, the speed control pattern of the acceleration region to be applied is changed (switched). However, in the modified example, the speed control pattern of the acceleration region to be applied may be gradually changed according to the passage of time after the start of feeding without using such a stack height determination threshold. For example, the change in the stacking height of the corrugated cardboard sheet SH may be continuously detected, and the roller control pattern may be changed according to the detected stacking height every 1 second after the start of feeding. Specifically, the start position of the acceleration region may be gradually shifted from the rotation angle of 0 °, or the end position of the acceleration region may be gradually shifted from the rotation angle of 65 ° according to the detected stack 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. You may. In this case, the shift amount setting value may not be set in advance, but the operator may set the shift amount setting value by manual input via the operation panel 240.

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

(Modification example 10)
In the above-described embodiment, the roller control pattern includes the stop region R14, but in the modified example, the roller control pattern that does not include the stop region may be applied. In the roller control pattern that does not include the stop region, the speeds of the feeding rollers 124 to 127 become 0, and at the same time, the upper surface of the great 141 is lowered from the upper surfaces of the feeding rollers 124 to 127, and the corrugated cardboard sheet SH and the feeding rollers are lowered. Since 124 to 127 come into contact with each other, when the acceleration start timing is changed as in the above-described embodiment, it is necessary to change the ascending / descending timing of the great 141 as well. However, when the magnitude of the acceleration is changed as in the first modification, it is not necessary to change the ascending / descending timing of the Great 141.

(Modification 11)
In the above-described embodiment, the corrugated cardboard sheet feeding device 2 is provided with the Great 141, but the present invention is a corrugated cardboard sheet feeding device not provided with the Great, that is, a corrugated cardboard that continuously feeds the corrugated cardboard sheet only by the feeding roller. It can also be applied to sheet feeding devices. In this modification, the stop timing of each feeding roller may be adjusted according to the sheet size of the corrugated cardboard sheet.

1 Cardboard sheet box making machine 2 Cardboard sheet feeder 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 motor 124, 125, 126, 127 Feeding roller 141 Great 195 Stack height detection sensor 210 Lower control device 220 Program memory 240 Operation panel 244 Information display unit 254 Roller motor control device 255 Pattern number setting memory 260 Motion Controller 261 Roller control pattern memory

Claims (20)

It is a corrugated cardboard sheet feeding device,
A delivery table on which laminated corrugated cardboard sheets are placed, and
A feeding roller that feeds out the lowest layer corrugated cardboard sheets among the corrugated cardboard sheets laminated on the feeding table one by one.
A roller motor that rotationally drives the feed roller and
An acceleration region for accelerating the rotation of the feeding roller, a constant speed region for rotating the feeding roller at a constant speed after this acceleration region, and a constant speed region after the constant speed region of the feeding roller. A control device configured to control the roller motor at a variable speed based on a speed control pattern including a deceleration region for decelerating rotation and to feed a corrugated sheet by the feed roller.
Have,
While the control device is performing one order production, the rear end of the corrugated cardboard sheet of the lowest layer is the corrugated cardboard sheet regardless of the change in the weight of the corrugated cardboard sheets laminated on the feeding table. To the sheet weight-related value related to the weight of the corrugated cardboard sheets laminated on the feeding table so that the feeding timing of being sent out from the feeding device and being sent to the downstream side of the corrugated cardboard sheet feeding device is constant. Based on this, it is configured to change the speed control pattern in the acceleration region.
When the sheet weight-related value is less than a predetermined threshold value, the control device delays the timing of starting acceleration of the corrugated cardboard sheet as compared with the case where the sheet weight-related value is equal to or more than the threshold value, and /. Alternatively, the speed control pattern in the acceleration region is configured to be changed so as to reduce the magnitude of acceleration when accelerating the corrugated cardboard sheet.
When the control device changes from a state in which the sheet weight-related value is equal to or more than the threshold value to a state in which the value is less than the threshold value while one corrugated cardboard sheet is being fed by the corrugated cardboard sheet feeding device. , The speed control pattern of the acceleration region applied to deliver this corrugated board sheet is configured not to be changed.
A corrugated cardboard sheet feeding device characterized by this. The corrugated cardboard sheet feeding device according to claim 1, wherein the threshold value is set based on the specifications of the corrugated cardboard sheet delivered by the corrugated cardboard sheet feeding device. The specifications of the corrugated cardboard sheet are the flutes of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to claim 2, wherein the threshold value is set to a smaller value as the flute is thinner. The specifications of the corrugated cardboard sheet are the dimensions of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to claim 2, wherein the threshold value is set to a smaller value as the dimension is larger. The specification of the corrugated cardboard sheet is the basis weight of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to any one of claims 2 to 4, wherein the threshold value is set to a smaller value as the basis weight is larger. An input device for the operator to input the threshold value is further provided.
The corrugated cardboard sheet feeding device according to any one of claims 1 to 5, wherein the control device uses the threshold value input to the input device. The control device is configured to store the threshold value used in a certain order, and read out and apply the stored threshold value when an order having the same specifications as the stored order is performed next time. The corrugated cardboard sheet feeding device according to any one of claims 1 to 6. The control device is
Based on the sheet weight-related value, the speed control pattern in the acceleration region is changed so as to delay the timing of starting the acceleration of the corrugated cardboard sheet and / or reduce the magnitude of the acceleration when accelerating the corrugated cardboard sheet. And at the same time
15. The corrugated cardboard sheet feeding device according to any one item. The corrugated cardboard sheet feeding device according to claim 8, wherein the feeding adjustment amount is set based on the specifications of the corrugated cardboard sheet delivered by the corrugated cardboard sheet feeding device. The specifications of the corrugated cardboard sheet are the flutes of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to claim 9, wherein the feeding adjustment amount is set to a larger amount as the flute is thinner. The specifications of the corrugated cardboard sheet are the dimensions of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to claim 9 or 10, wherein the feeding adjustment amount is set to a larger amount as the dimension is larger. The specification of the corrugated cardboard sheet is the basis weight of the corrugated cardboard sheet.
The corrugated cardboard sheet feeding device according to any one of claims 9 to 11, wherein the feeding adjustment amount is set to a larger amount as the basis weight is larger. The operator further has an input device for inputting the feed adjustment amount.
The corrugated cardboard sheet feeding device according to any one of claims 8 to 12, wherein the control device uses the feeding adjustment amount input to the input device. The control device stores the feed adjustment amount used in a certain order, and when an order having the same specifications as the order in which the feed adjustment amount is stored is performed next, the stored feed is stored. The corrugated cardboard sheet feeding device according to any one of claims 8 to 13, which is configured to read out and apply the adjustment amount. The control device stores a plurality of speed control patterns having different acceleration regions in advance, and selects a speed control pattern according to the feed adjustment amount from the plurality of speed control patterns. The corrugated cardboard sheet feeding device according to any one of claims 8 to 14, which is configured to be applied. The corrugated cardboard sheet feeding according to any one of claims 8 to 14, wherein the control device is configured to obtain and apply a speed control pattern according to the feeding adjustment amount by a predetermined calculation formula. Device. The control device is
The speed control pattern is applied to each of the two corrugated cardboard sheets so that the two corrugated cardboard sheets are sent out while the printing cylinder of the printing device provided on the downstream side of the corrugated cardboard sheet feeding device makes one rotation. Apply and
The speed control pattern of the acceleration region applied to the corrugated cardboard sheet to be fed first among the two corrugated cardboard sheets, and the corrugated cardboard sheet to be fed later among the two corrugated cardboard sheets. The corrugated cardboard sheet feeding device according to any one of claims 1 to 16, wherein both speed control patterns in the acceleration region are changed based on the sheet weight-related value. The corrugated cardboard sheet feeding device according to any one of claims 1 to 17, wherein the sheet weight-related value is the height of the corrugated cardboard sheets laminated on the feeding table. The corrugated cardboard sheet feeding device according to claim 18, further comprising a sensor for detecting the height of the corrugated cardboard sheets laminated on the feeding table. The corrugated cardboard sheet feeding device according to any one of claims 1 to 19.
A plurality of processing devices provided on the downstream side in the feeding direction of the corrugated cardboard sheet feeding device, including at least a printing device for printing on the corrugated cardboard sheet, and a plurality of processing devices.
A corrugated board sheet making machine characterized by having.

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