JP2014031239A - Roll diameter calculation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive roll diameter calculation device capable of detecting a roll diameter at high accuracy.SOLUTION: Direct input is performed to a programmable controller 101 which executes a sequential programs through an interruption signal, and when the input is performed, the programmable controller 101 executes, with priority, roll diameter calculation processing for calculating a roll diameter of a rolling-out target roll 1R, determination processing for determining whether or not the calculated roll diameter is less than a reference value, and command processing for transmitting a command signal to an external device on the basis of the determination result.

Description

  The present invention relates to a roll diameter calculation device that calculates the roll diameter of a roll around which a sheet is wound.

  For example, as shown in Patent Document 1, a product such as a paper diaper first unwinds a flexible sheet as a work material wound on a roll and supplies the sheet downstream, and performs various processes downstream in the flow. Processing is performed sequentially. In downstream processing, a plurality of products (or intermediate products in the middle of product completion) are formed along the flow direction, and finally these products are cut and separated into products to complete the products. . In this way, in the sheet supply apparatus that unwinds the sheet on the upstream side and supplies it to the downstream side, the sheet end and the next roll of the current roll that are emptied in the process in which the sheet wound on the roll is supplied downstream Therefore, a sheet splicing device that connects the current roll to the next roll is required.

  Some conventional sheet supply apparatuses are provided with a sheet accumulating unit on the downstream side of the roll so that the sheet can be continuously supplied without being interrupted when the roll is switched. In other words, in order to perform sheet splicing, it is necessary to stop unwinding of the sheet from the roll. Therefore, during the sheet unwinding stop period, the sheet splicing device feeds the sheet stored in the sheet accumulation unit downstream. Thus, time is taken up, and the sheet unwinding is resumed as the sheet joining is completed, so that the normal unwinding supply can be restored. Briefly speaking, when the unwinding of the sheet is stopped (when the roll is switched), the “accumulation” of the sheet accumulation unit is released, so that the sheet supply to the downstream side can be continued without interruption.

  In this case, in the conventional sheet supply apparatus, the unwinding of the sheet is stopped with a certain margin in the remaining amount of the sheet, and then the sheet joining is performed. However, there is no choice but to discard the remaining roll after leaving the sheet. In order to solve this problem, it is essential to manage the remaining amount of roll more than before. Conventionally, the remaining amount of roll is managed by the outer diameter of the roll (hereinafter referred to as roll diameter). When the roll diameter reaches a predetermined reference value (shaft diameter + Δα), the rotation of the roll is stopped and the sheet splicing is performed. Therefore, it is important to calculate the roll diameter with high accuracy.

  However, in a sheet supply apparatus having various arithmetic devices, separately providing an arithmetic device dedicated to the diameter calculation causes a large cost increase, which makes it difficult for a small-scale manufacturer to handle. However, having a relatively low-spec low-cost computing device also used for diameter computation not only increases the burden on the computing device, but also causes a delay in the acquisition timing of input information for diameter computation, As a result, the accuracy of the input information is deteriorated, and finally, the accuracy of the diameter calculation is deteriorated.

Japanese Patent Application No. 2012-090949

  The subject of this invention is providing the roll diameter calculating apparatus which can detect a roll diameter with high precision at low cost.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the sheet feeding apparatus of the present invention is:
Sheet unwinding drive means for unwinding the sheet from a roll around which the sheet is wound;
Unwinding length detection means for detecting unwinding length information indicating the unwinding length of the unwound sheet;
Timing detection means for outputting a timing detection signal in accordance with detection of the timing at which the roll rotating at the time of unwinding the sheet rotates by a predetermined angle;
Configured as a programmable controller capable of executing a predetermined series of programs and capable of direct input by an interrupt signal for preferential execution of a predetermined priority program even during execution of the series of programs When a timing detection signal is input as an interrupt signal, the priority program is executed using the input as a starting point, and the roll of the roll to be unwound based on the detection contents of both the unwinding length detection means and the timing detection means Diameter calculation processing for calculating a predetermined roll diameter reflection value in which the diameter is reflected, and determination for determining whether the roll diameter is less than a predetermined reference value based on the calculated roll diameter reflection value Control means having main control means for executing processing and command processing for transmitting a command signal to an external device based on the determination result ,
It is characterized by providing.

  In the conventional roll diameter calculation processing, there is a tendency that wasted time is spent until the calculation is started, and it is difficult to ensure a fixed time system due to the fluctuation of the time. That is, the programmable controller that executes the calculation repeatedly performs internal processing (scanning) that executes input processing, main program processing, output processing, and END processing in this order in accordance with a series of internal programs. However, in this internal process, once the input process is completed, even if there is a change in the input signal in the subsequent main program process, output process, and END process, the input signal is not reflected. The input signal is not reflected unless it is the next internal processing. For this reason, in the conventional roll diameter calculation processing, even when a calculation start trigger signal is input, the current internal processing (scan) in the CPU is completed and the next internal processing (scan) is executed. Until then, the roll diameter calculation process based on the input is not performed, and the time is delayed by the waiting time.

  However, according to the configuration of the present invention, the roll diameter calculation process can be preferentially started from the direct input by the interrupt signal, so that the internal processing time (scan time) can be almost ignored. Since the waiting time as described above does not occur, high calculation accuracy can be secured. If this is employed in a sheet feeding apparatus that performs sheet splicing, it is possible to save sheets, and it is also possible to reduce the burden on the environment by reducing waste.

The figure which showed simply the structure (mainly drive structure) of the sheet supply apparatus which makes one Embodiment of this invention. The figure which showed simply the structure (mainly pneumatic structure) of the sheet supply apparatus which makes one Embodiment of this invention. The block diagram which showed simply the electric constitution of the sheet supply apparatus of FIG. 1A and 1B. 3A and 3B are diagrams illustrating sheet extension processing and path length variable processing executed by the sheet supply apparatus in FIGS. 1A and 1B. The figure which continues from FIG. 3A. The figure which continues from FIG. 3B. The figure which continues from FIG. 3C. The figure which continues from FIG. 3D. The figure which continues from FIG. 3E. The figure which continues from FIG. 3F. The figure which continues from FIG. 3G. The figure which continues from FIG. 3H. The figure which continues from FIG. 3I. FIG. 4 is an explanatory diagram of control during execution of a sheet extension process and a path length variable process shown in FIGS. 3A to 3J. The flowchart which shows the flow of a calculation process of a roll diameter (roll thickness). 6 is a flowchart showing a flow of sheet extension processing. The figure which shows the relationship between the detection result of the unwinding length detection part 71 and the rotation angle detection part 72, and a roll diameter (roll thickness). The figure which shows the unwinding state at the time of the diameter of a roll diameter being large. The figure which shows the unwinding state at the time of the diameter of a roll diameter being small. The figure which shows an unwind drive mechanism. The figure which shows the electrical constitution of the conventional sheet supply apparatus. 1A and 1B are diagrams illustrating a state in which roll diameter calculation processing in the sheet supply apparatus of FIGS. 1A and 1B is applied to a conventional sheet supply apparatus. The figure explaining the internal process of CPU in the conventional sheet supply apparatus. The figure which illustrates the signal input timing to CPU in the conventional sheet supply apparatus. The figure explaining the electrical constitution of the sheet supply apparatus of Drawing 1A and Drawing 1B. The figure which demonstrates concretely the electrical constitution of the sheet supply apparatus of FIG. 1A and FIG. 1B. The figure explaining the method of calculating a roll diameter by average. The figure which showed simply the modification of the mechanism in which the path | route length of a sheet | seat storage path is made variable. The figure which showed the structure of the air cylinder simply.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1A and 1B.

  In the present embodiment, the sheet supply device and roll diameter calculation device 1 includes a sheet unwinding drive unit 10 for unwinding a sheet 1S from a current roll 1R set as an unwinding target, and a sheet unwinding drive unit 10 for unwinding the sheet 1S. The sheet extension drive means 20 for performing sheet splicing processing for joining the sheet end 1s of the next roll 1R to the sheet end 1t (FIGS. 3E to 3J) of the current roll 1R, and the sheet unwound by the sheet unwind drive means 10 The sheet accumulation means 30 in which the sheet accumulation path 3 through which 1S passes is formed, the path length variable drive means 40 for changing the path length of the sheet accumulation path 3, and the sheet 1S that has passed through the sheet accumulation path 3 are drawn in. Sheet supply driving means 50 for feeding the sheet 1S downstream with a predetermined downstream tension, and tension of the sheet 1S drawn into the sheet supply driving means 50 ( Tension detection unit 60 that detects tension information for specifying the roll diameter, roll diameter information detection unit 70 that detects roll diameter information for specifying the roll diameter of the current roll 1R that is currently unwinding, And a control unit 100.

  The control unit 100 according to this embodiment includes a sheet unwinding control unit that controls unwinding of the sheet by the sheet unwinding driving unit 10, and a sheet that extends the sheet 1S by causing the sheet extension driving unit 20 to execute the sheet splicing process. The extension control unit and the path length variable driving unit 40 function as a storage sheet discharge control unit that changes the path length of the sheet storage path 3.

  The control unit 100 as the sheet extension control means acquires a predetermined roll diameter reflected value reflecting the roll diameter of the roll 1R by the roll diameter information detecting unit 70, and rolls based on the acquired roll diameter reflected value. When it is determined that the diameter is less than a predetermined reference value, the sheet unwinding driving unit 10 stops unwinding of the sheet 1R from the roll 1R as the sheet extension process, and the sheet accumulation is performed in the stopped state. On the upstream side of the means 30, the sheet end 1t of the roll 1R is caused to execute the sheet splicing process for joining the sheet end 1s of the next roll 1R. In the figure, the current roll 1R is a roll 1RA, and the next roll 1R is a roll 1RB, which are switched each time a sheet splice occurs.

  The control unit 100 serving as the accumulated sheet discharge control unit uses the path length variable driving unit 40 so that the sheet feeding to the sheet supply driving unit 50 is continued even when the unwinding of the sheet 1S is stopped during the sheet extension process. By changing the path length of the sheet accumulation path 3, the accumulated sheets 1 </ b> S are sent to the sheet supply driving unit 50 in a form in which the accumulation amount is increased or decreased.

  Further, the control unit 100 according to the present embodiment performs unwinding control of the sheet 1S with respect to the sheet unwinding drive unit 10 both during the sheet extending process and during the normal unwinding of the sheet 1S that is not subjected to the sheet extending process, The path length change control of the accumulation path 3 is detected so that the tension of the sheet 1S drawn into the sheet supply driving means 50 is maintained at the upstream tension corresponding to a predetermined downstream tension. It also has a function as tension control means that is executed based on the tension of the sheet 1S.

  Here, the sheet supply device / roll diameter computing device 1 of the present embodiment will be described in more detail.

  The sheet unwinding drive unit 10 includes an unwinding drive mechanism 11 that unwinds the sheet 1S from the roll 1R, and an unwinding drive source 12 that causes the unwinding drive mechanism 11 to unwind. The unwinding drive mechanism 11 of the present embodiment includes an unwinding shaft portion 13 (free roller) on which the roll 1 </ b> R is rotatably disposed, and an outer peripheral surface of the roll 1 </ b> R rotatably disposed on the unwinding shaft portion 13. And a pressing force applying means 15 for applying a pressing force for pressing the outer peripheral surface of the roll 1R inward against the rotating body 14 in the pressing state (pressing state). The rotating body 14 drives the drive source 12 so as to rotate in the unwinding rotation direction for unwinding the sheet 1S from the pressing roll 1R, thereby unwinding the sheet 1S in the form of being pushed out from the roll 1R.

  The rotating body 14 here is an annular rotating belt stretched so as to surround the two shaft portions 16 and 17 from the outer peripheral side. One shaft portion 16 is a rotating shaft portion (rotating roller) that can rotate around its own axis line when the rotation of the servo motor that is the drive source 12 is transmitted, and the rotation is transmitted to the rotating belt 14 to rotate the rotating belt. It also functions as a rotation transmission shaft portion that rotates 14. The other shaft portion 17 is a rotatable shaft portion (free roller), and freely rotates around its own axis by the rotation of the rotating belt 14. When the rotating belt 14 is pressed inward on the outer peripheral surface of the roll 1R, the rotation of the rotating belt 14 rotates the roll 1R, and the sheet 1S is unwound from the roll 1R by the rotation.

  The two shaft portions 16 and 17 are fixed to the swing member 18 (see FIG. 1B) so as to be rotatable around their respective axis lines. The swing member 18 swings around the axis (swing axis) of the shaft portion 16 on the other shaft portion 17 side, with the shaft portion 16 forming the rotating shaft portion (rotating roller) as a swing shaft portion. Configured to be rotatable. The other shaft 17 side swings and rotates about the swing shaft 16 so that the rotating belt 14 located on the other shaft 17 can approach the roll 1R side. Further, the swinging member 18 is pressed and urged by the pressing force applying means 15 (here, an air cylinder) so that the other shaft portion 17 side approaches the unwinding shaft portion 13 side by the swinging rotation. Thereby, the rotating belt 14 on the other shaft portion 17 side is held in a state where the outer peripheral surface of the roll 1R is pressed inward.

  By the way, in this embodiment, it has multiple unwinding drive mechanisms 11 for roll switching. Here, it has the 1st unwinding drive mechanism 11A and the 2nd unwinding drive mechanism 11B, and both mechanisms 11A and 11B are similarly comprised as mentioned above. When the roll 1R arranged in the first unwinding drive mechanism 11A is a first roll 1RA and the roll 1R arranged in the second unwinding drive mechanism 11B is a second roll 1RB, the control unit 100 One of them is set as the unwinding target, and the sheet 1S is unwound from the roll 1R set as the unwinding target by the rotational drive of the servo motor as the drive source 12. The drive source 12 may be prepared for both the mechanisms 11A and 11B.

  The unwinding target is switched in such a manner that the control unit 100 controls the switching unit 24. In the present embodiment, the rotation transmission target output from the drive source 12 by the switching is the rotating body 14 of the first unwinding drive mechanism 11A (specifically, the swinging shaft portion forming the rotation transmission shaft portion). 16) and the rotating body 14 of the second unwinding drive mechanism 11B (specifically, the swinging shaft portion 16 forming the rotation transmission shaft portion).

  More specifically, as shown in FIG. 1A, the first unwinding drive mechanism 11A and the second unwinding drive mechanism 11B can be integrally rotated with respect to the swing shaft portions 16 and 16, respectively. The rotating shaft parts 27 and 27 to be connected are provided, and the annular rotating belt 25 is stretched so as to surround both of the rotating shaft parts 27 and 27 from the outer peripheral side. Further, a rotation transmission shaft portion 26 that rotates around its own axis line by rotation of a servo motor that constitutes the drive source 12 and that rotates the belt 25 by rotation thereof is provided in the annular rotation belt 25. The rotation of the servo motor that constitutes the drive source 12 is transmitted to the rotation transmission shaft portion 26 via the speed reducer 120 as shown in FIG. The rotating belt 25 is rotated by the rotation of the rotation transmission shaft portion 26, thereby rotating the rotating shaft portions 27 and 27. However, the rotary shaft portion 27 is connected to the swing shaft portion 16 via the switching means 24, and transmits its own rotation to the swing shaft portion 16 so that the swing shaft portion 16 is integrated. It is possible to switch between a connected state in which the rotation is performed and a non-connected state in which the rotation is not transmitted to the swinging shaft portion 16 and is freely rotated.

  The switching means 24 of the present embodiment is an electromagnetic clutch that switches between the above-described connected state and non-connected state. Here, the electromagnetic clutches 24C and 24D (see FIGS. 2 and 9) are provided to both the swing shaft portions 16 and 16. Here, reference numeral 24C is an electromagnetic clutch of the left swing shaft portion 16 in FIG. 1 and the like, and reference numeral 24D is an electromagnetic clutch of the right swing shaft portion 16). The control unit 100 switches the switching means 24C and 24D so that the other rocking shaft part 16 is disconnected when the one rocking shaft part 16 is in the connected state. One of the rolls 1RB is set as an unwinding target.

  When the roll diameter of the current roll 1R on which the sheet 1S is being unwound by the sheet unwinding drive means 10 falls below a predetermined reference value (set value), the sheet extension drive means 20 This is a sheet splicing drive unit that stops the unwinding of the sheet 1S and performs a sheet splicing process for joining the sheet end s of the next roll to the sheet end 1t of the current roll 1R in the unrolling stopped state. Here, the sheet extension driving means 20 further functions as roll switching driving means for switching the roll 1R to be unwound to the next roll 1R after completion of the sheet splicing process. The next roll 1R is set as a new unwinding target. The unwinding of the sheet 1S from the roll 1R is continued. Then, after a while, when the roll diameter of the newly unrolled roll 1R again falls below the predetermined reference value, the unwinding of the sheet 1S from the roll 1R is stopped, and the sheet of the sheet 1S is stopped. A sheet splicing process similar to the above, in which the sheet end 1s of the next roll is further spliced to the end 1t, can be performed.

  The sheet extension drive means 20 of the present embodiment is a stop holding means 21 for holding the stop state of the sheet 1S that has already been unwound downstream from the current roll 1R that is the object of unwinding in the unwinding stop state as described above. (See FIG. 2), cutting means 22 for cutting the sheet 1S upstream of the stop holding means 21, a sheet end 1t on the downstream side of the sheet 1S formed by cutting, and a sheet end 1s of the next roll 1R It has an adhering means 23 for adhering and joining, and a switching means 24 for switching the roll to be unwound of the sheet unwinding driving means 10 from the current roll 1R to the next roll 1R. The sheet 1S unwound from the roller 1R and fed to the sheet extension driving means 20 is changed in direction by a direction changing guide 19 (guide roller) that changes the path of the sheet 1S, and then to the sheet extension driving means 20. It has been sent. The direction conversion guide 19 (guide roller) here is a free roller.

  The adhering means 23 is connected to the sheet end 1t of the current roll 1R in a section where the sheet end 1s of the sheet 1S unwound from the next roll 1R faces the sheet 1S unwound from the current roll 1R. The pressing plate 23A, 23B that presses and clamps the sheet ends 1t, 1s in such a manner that the sheet end 1s of the next roll 1R is brought into close contact with each other, and the pressing drive that drives the plates 23A, 23B to approach and press each other. Part (plate drive part: for example, an air cylinder or a servo motor forming an electric drive part) 23C, 23D, and the drive part 23C, 23D is driven and controlled by the control part 100. The sheet end 1t of the current roll 1R is a sheet end formed by cutting by the cutting means 22. The sheet end 1s of the next roll 1R is a leading end of the sheet 1S wound as the next roll 1R, and an adhesive surface is formed in advance on the leading end 1s. When the above clamping pressure by the pressing plates 23A and 23B is applied, the adhesive surface comes into contact with the sheet end 1t to be bonded and fixed, and the sheet 1S of the next roll 1R is bonded and connected to the sheet 1S of the current roll 1R. It becomes a state.

  Note that the state in which both the sheets 1S and 1S are pressed and pressed by the pressing plates 23A and 23B can be said to stop and hold both the sheets 1S and 1S, so the bonding means 23 of the present embodiment is stopped. Although it functions also as the holding means 21, each may be provided separately.

  The pressing plates 23A and 23B here are suction plates, which are pressed and bonded to each other in a state where the sheets 1S on the respective sides are sucked and held. In addition, the sheets 1S and 1S are bonded to each other by an adhesive surface formed in advance on the sheet tip 1s of the next roll 1R. The adhesive surface is affixed with a double-sided adhesive tape on the sheet tip 1s of the next roll 1R. Or by applying an adhesive. Further, the sheets 1S and 1S may be bonded by heat welding at the time of pressing by the pressing plates 23A and 23B.

  The cutting means 22 pushes the cutters 22A and 22B (sword portions) that respectively cut the sheets 1S and 1S stopped and held as described above, and the cutters 22A and 22B close to the corresponding sheets 1S and 1S. The cutting drive units 22C and 22D (air cylinders in this case) are driven to be attached, and the control unit 100 drives and controls the cutting drive units 22C and 22D. Specifically, the control unit 100 uses the cutter 22A or 22B corresponding to the roll 1R to be unwound to cut the corresponding sheet 1S that has been unwound and is in a stopped state. A sheet end 1t is formed on the downstream side.

  The switching unit 24 switches the current roll 1R to be unrolled by the drive source 12 of the sheet unwinding driving unit 10 to the next roll 1R. Here, the switching means 24 is the above-described electromagnetic clutches 24 </ b> C and 24 </ b> D, and the ON / OFF switching control is performed by the control unit 100.

  The sheet accumulating means 30 has a sheet accumulating path 3 through which the sheet 1S unwound by the sheet unwinding driving means 10 passes, so that the path length can be changed. In the sheet accumulating unit 30 of this embodiment, a sheet reciprocating path is formed as the sheet accumulating path 3 that repeatedly reciprocates and changes direction. The reciprocating path 3 includes a first side direction changing guide group 33 including a plurality of direction changing guides 31 (guide rollers) for guiding the direction changing of the passing sheet 1S on the first side of the reciprocating path 3; And a second side direction change guide group 34 composed of a plurality of direction change guides 32 (guide rollers) for guiding the direction change of the sheet 1S on the second side opposite to the side. In the reciprocating path 3, the sheet 1S unwound from the roll 1R set as the unwinding target is disposed so as to be able to be fed to the downstream side, and the disposed sheet 1S is accumulated.

  The path length variable drive unit 40 is a drive unit that varies the path length of the sheet accumulation path 3, and the path length variable drive control that varies the path length is executed by the control unit 70. The path length variable drive means 40 of the present embodiment is a guide for causing the first side direction conversion guide group 33 (direction conversion guide 31) to approach or separate from the second side direction conversion guide group 34 (direction conversion guide 32). A guide group drive unit having a group movement mechanism 41 and a guide group movement drive source 42 for moving the guide group movement mechanism 41 toward or away from the guide group movement mechanism 41, and the approach or separation is executed. Thus, the path length of the sheet accumulation path 3 can be increased or decreased. When the path length of the sheet accumulation path 3 is shortened, the amount of sheets that can be accumulated decreases, so the sheet 1S that can no longer be accumulated is sent downstream. On the other hand, when the path length of the sheet accumulation path 3 becomes long, the amount of sheets that can be accumulated increases, so that a part of the sheet 1S that should be sent downstream is accumulated without being sent.

  Further, the reciprocating path 3 of the present embodiment has a plurality of linear paths 3L arranged in parallel, and the direction change approaching the other direction change guide group 34 among the first side and second side direction change guide groups 33, 34. In the guide group 33, a plurality of direction changing guides 31 to which the guide group 33 belongs are fixed to a single fixing member 35. The fixing member 35 is configured to be accessible to the other direction changing guide group 34 along the straight path 3L. Further, the fixing member 35 has linear movement guides 43 and 43 for guiding linear movement along a plurality of linear paths 3L arranged in parallel on both sides of the linear paths 3L in the arrangement direction.

  The linear movement guides 43 and 43 of the present embodiment are ball shaft screw shafts 43 and 43 that rotate around their own axes, and both the screw shafts 43 and 43 are output shafts of a servo motor that forms a drive source 42. The rotation of the portion 44 is transmitted through the rotating belts 45 and 45, and both rotate in conjunction with each other. On the other hand, the fixing member 35 is opposed to the screw shaft portions 43 and 43 so that the fixing member 35 slides in the axial direction of the screw shaft portions 43 and 43 in accordance with the interlocking rotation of the screw shaft portions 43 and 43 at both ends. It is fixed by a nut portion (not shown) via a ball. That is, by rotating the motor shaft 42, the screw shaft portions 43 and 43 are rotated in either the forward or reverse direction around their own axis, so that the position of the fixing member 35 (slider) is moved back and forth on the screw shaft portions 43 and 43. As a result, the direction change guide group 33 (direction change guide 31) on the fixing member 35 moves back and forth on the screw shaft portions 43 and 43, and the path length of the sheet accumulation path 3 (here, a straight line) The length of the path 3L) increases or decreases.

  Further, for the configuration in which the fixing member 35 is linearly moved along the linear path 3L, a configuration other than the ball screw may be used. For example, as shown in FIG. 17, an annular belt 49B is stretched so as to surround a plurality of free rollers 49R, and the belt 49M is rotated in both forward and reverse directions so that the annular belt 49B is linearly routed. It can be reciprocated at 49L. The drive roller 49D may be a drive motor 49M that is driven by the servomotor 42. The fixing member 35 to which the direction changing guide group 33 is fixed is fixed to the belt 49B on the straight path portion 49L and moves together with the belt 49B. That is, the direction changing guide group 33 can be reciprocated along the straight path portion 49L, and thereby the path length of the straight path 3L can be increased or decreased.

  In the present embodiment, position detection units 46 and 47 that detect the position of the fixing member 35 in the moving direction of the fixing member 35 (the axial direction of the screw shaft portion 43) are provided. A rotary encoder or linear encoder that indirectly or directly detects the current position in the moving direction of the fixing member 35 may be used. Here, however, the origin position (standby position) of the fixing member 35 and a predetermined position before it are detected and overrun. In order to prevent a run, a known proximity sensor is provided as position detectors 46, 47, 48 fixedly installed at predetermined positions in the moving direction.

  The sheet supply driving unit 50 is a driving unit that pulls in the sheet 1S that has passed through the sheet accumulation path 3 and sends it out in a form having a predetermined downstream tension on the downstream side. The sheet supply driving means 50 of the present embodiment rotationally drives either or both of the rotary shaft portions 51 and 51 (feed rollers) and the rotary shaft portions 51 and 51 that form a rotatable pair that are arranged close to each other. A sheet supply drive source (sending drive source) 52. The sheet 1S that has passed through the sheet accumulation path 3 is disposed between the rotary shafts 51 and 51 so that the sheet 1S is pressed, and the drive source 52 drives the pressed sheet 1S to be pushed downstream. Thus, the sheet 1S is sent to the downstream side without slipping.

  More specifically, the drive source 52 is a servo motor, and an annular rotating belt 54 is stretched so as to surround the output shaft portion and one rotating shaft portion 51 from the outer peripheral side. The other rotating shaft 51 is a rotatable shaft and rotates freely. When the output shaft portion of the servo motor 52 rotates, the rotating belt 54 rotates, and the one rotating shaft portion 51 is rotated by the rotation. As a result, the sheet 1 </ b> S sandwiched between the other rotation shaft portion 51 is pushed out in the rotation direction of the one rotation shaft portion 51.

  In the state where the sheet 1S between the rotary shaft portions 51 and 51 is clamped, the pressing force applying means 53 (here, the pressing force applying means 53 for applying a pressing force to constantly press one rotary shaft portion 51 against the other rotary shaft portion 51). Air cylinder).

  The tension detection unit 60 is a detection mechanism that detects predetermined tension information in which the tension is reflected in order to calculate the tension of the sheet 1 </ b> S drawn into the sheet supply driving unit 50 from the upstream side. The tension detector 60 of the present embodiment is fixed to a rotating member 61 (arm) that can rotate around a predetermined rotation axis, and the outer peripheral side of the rotating member 61, and from the sheet storage means 30 (sheet storage path 3) to the sheet. A direction changing guide 62 (guide roller) for changing the direction of the sheet 1S existing in the section between the supply driving means 50 from the first rotation direction of the rotation member 61 to the second rotation direction opposite to the rotation direction; The rotation direction first side with respect to the rotation member 61 is controlled so that the rotation to the rotation direction second side generated in the rotation member 61 is suppressed as the direction conversion guide 62 generates the direction change feed of the sheet 1S. Rotation suppression means 63 for applying a rotation suppression force (here, constant air pressure (spring force is also acceptable): this constant air pressure is a set value and can be adjusted according to the workpiece), and the rotation suppression force The times rotated against Rotation angle detecting unit 64 for detecting the rotation angle of the member 61 and a (rotary encoder or the like). That is, the tension detection unit 60 of the present embodiment uses the rotational movement amount (also referred to as the rotational movement distance and rotational angle) of the rotating member that is generated against the rotation suppression force, and tension information that reflects the tension of the sheet 1S. (Tension reflected value) is detected, and the control unit (tension detecting means) 100 calculates the tension based on the detected tension information.

  The rotation suppression means 63 of the present embodiment is an air cylinder, and can rotate and displace the rotating member 61 within a certain movable range while applying tension to the seat 1S. That is, the rotation suppressing means 63 does not actively apply tension to the sheet 1S as in the above-described path length change, but passively applies tension to the sheet 1S. (Especially when a sudden change in tension occurs in the sheet 1S on the downstream side of the sheet extension drive means 20), the tension is released and absorbed by its own movement, and excessive tension is applied to the sheet 1S. Application and omission are prevented. In this embodiment, the sheet 1S sent to the direction change guide 62 (guide roller) is changed in direction by the direction change guide 9 (guide roller) downstream of the sheet accumulation path 3 (two directions here). Converting).

  In addition, the air cylinder that constitutes the rotation suppression means 63 of the present embodiment transmits the force in the rotation direction to the rotating member 61 in such a manner that pressure is applied to the piston 63P according to the internal air pressure, and the rotation suppression force is thus obtained. generate. The air pressure is held so as to be constant during the driving in which the sheet 1S is being sent, while the value can be adjusted according to the workpiece when not driving. As shown in FIG. 18, the air cylinder 63 here supplies air for driving the piston 63 </ b> P into the air cylinder 63 with respect to the air cylinder 63 having the piston 63 </ b> P that operates according to the internal air pressure. The amount of air supplied from the compressor 63C to the air cylinder 63 so that the air pressure in the compressor 63C as an air supply source to be performed and the air pressure in the air cylinder 63 are fixedly maintained at a set value (set pressure) fixed to itself. And a regulator 63 </ b> R that forms a pressure regulating unit that regulates the amount of air discharged from the air cylinder 63 is provided. The regulator 63 </ b> R constituting the pressure adjusting unit includes an adjustment operation unit 63 </ b> B that can adjust the magnitude of the air pressure (set pressure) that is constantly held in the air cylinder 63 by a user operation. The adjustment operation unit 63B may be configured as an operation unit such as a dial operation unit, and may be configured as a manual adjustment unit that adjusts the magnitude of the air pressure (set pressure) held constant according to the operation amount. Here, an operation unit (for example, a touch panel) 63B that accepts the magnitude of the air pressure held constant by numerical input is used, and the control unit 63A controls the electropneumatic regulator 63R based on the input set value (set pressure). Is configured as an electric adjustment means that is adjusted electrically.

  The roll diameter information detection unit 70 is a detection mechanism that detects predetermined roll diameter information used to calculate a roll diameter reflected value (including the roll diameter itself) of the roll 1R that is currently unwound. In the present embodiment, roll diameter information includes predetermined unwinding length information that enables specification of the unwinding length (unwinding amount) of the sheet 1S unwound from the roll 1R set as the unwinding target. An unrolling length detection unit 71 (unwinding amount detection unit) that detects the rotation angle, and a rotation angle detection unit 72 that detects rotation angle information that enables specification of the rotation angle of the roll 1R as roll diameter information. Based on this detection result, the control unit (roll diameter reflected value acquisition means) 100 calculates and acquires the roll diameter reflected value.

  The unwinding length detection unit 71 reflects the rotational movement distance (rotation amount) of the rotating belt 14 (rotating body) that unwinds the sheet 1S from the roll 1R by its own rotation as the unwinding length information. It is a rotation angle detection part (rotation amount detection part) which detects the rotation angle of the part 26. FIG. Here, the rotation transmission shaft portion 26 that transmits the rotation of the servo motor that constitutes the drive source 12 to the rotating belt 14 (rotating body), and the rotation shaft portion 76 (free roller) that is rotatable separately from them, An annular rotating belt 75 is stretched so as to surround from the outer peripheral side, and the shaft portions 26 and 76 can be rotated in an interlocking manner. The unwinding length detecting portion 71 determines the rotation angle (rotation amount) of the rotating shaft portion 76. This is a rotary encoder provided on the rotary shaft portion 76 for detection. The rotation transmission shaft portion 26 rotates by the amount of unwinding the sheet 1S from the roll 1R, and the rotation shaft portion 76 rotates in conjunction with the rotation transmission shaft portion 26. Therefore, the rotation angle (rotation amount) of the rotation shaft portion 76 is changed. By detecting, the unwinding length (unwinding amount) of the sheet 1S unrolled from the roll 1R can be specified. Specifically, the unwinding length detection unit 71 outputs a pulse signal as the unwinding length information and inputs it to the control unit 100 every time the rotation shaft unit 76 rotates by a predetermined angle, and the control unit (unwinding length). The detecting means 100 can identify the unwinding length of the sheet 1S from the number of pulses.

  On the other hand, the rotation angle detection unit 72 is a rotation angle detection unit that detects the rotation angle of the unwinding shaft unit 13 on which the roll 1R is disposed as the rotation angle information. Here, an annular rotating belt 74 is stretched around the unwinding shaft portion 13 and another rotatable rotating shaft portion 73 (free roller) separately from the outer peripheral side thereof. The rotation angle detector 72 is provided with a rotation sensor (for example, a rotation sensor provided on the rotation shaft 76 to detect that the rotation shaft 76 is rotated by a predetermined rotation angle (rotation amount)). An optical or magnetic rotation sensor or a known rotary encoder). The unwinding shaft portion 13 rotates by the amount of unwinding the sheet 1S from the roll 1R, and the rotating shaft portion 73 rotates in conjunction with the unwinding shaft portion 13, so that the rotation amount (rotation angle) of the rotating shaft portion 73 is increased. By detecting the rotation by a predetermined angle, it can be determined that the unwinding shaft portion 13 has also rotated by a predetermined angle. More specifically, a pulse is output to the control unit 100 as the rotation angle of the unwinding shaft portion 13 rotates by a predetermined angle, and the control unit (rotation angle detecting means) 100 uses the unwinding shaft portion 13 from the pulse. Is rotated by a predetermined angle, that is, when the roll 1R is rotated by a predetermined angle.

  Here, the electrical configuration of the sheet feeding device and roll diameter computing device 1 of the present embodiment will be described with reference to FIG.

  While the control unit 100 (control means) can execute a predetermined series of programs, an interrupt signal for preferentially executing a predetermined priority program even during execution of the series of programs. When the direct input is made, the main control unit 101 (main control means) capable of executing a predetermined priority program starting from the input is provided.

  The main control unit 101 here includes an input process for receiving input information from the outside, a main process for executing a series of programs determined in advance based on the input information received in the input process after the input process is completed, It is a PLC-CPU unit (PLC: Programmable Logic Controller) that can adopt a refresh input / output control method that sequentially executes a transmission process for transmitting output information based on the main process after the main process.

  That is, the main control unit 101 here is a program controller, and includes an I / O unit 101A (input / output information storage unit) that receives input information from the outside during input processing. The programmable controller 101 is a control means for driving and controlling devices in accordance with the order and conditions defined in the program, and the designed user program reads and writes information in the I / O memory area while reading instructions from the beginning to the end. Processing is performed in such a manner that it is sequentially executed one by one. The I / O memory area (input / output information storage area) is formed in the I / O section 101A built in the programmable controller. External input devices such as sensors and switches may be directly connected to the I / O unit 101A, or these external input devices may be connected via a separate I / O unit. Input information (data) sent from the connected external input device to the I / O unit 101A is exchanged in a batch with information stored in the I / O memory area at a certain timing (the above input processing: I / O). O refresh operation). This collective exchange is executed before the designed user program, and the user program executes processing based on the storage information in the I / O memory area after the collective exchange. After that, the user program performs necessary processes in order, and when all of them are completed, the input information from the external input device and the storage information in the I / O memory area are again exchanged collectively, and the I / O memory area after the collective exchange Based on the stored information, the user program executes processing, and the next cycle is started. This cycle is repeatedly executed. That is, the main control unit 101 here does not generate the user program (the main program in FIGS. 12 and 13) unless the exchange of the storage information in the I / O memory area is completed. Even if other information is input to the O memory area, it is not reflected in the user program until the storage information in the next I / O memory area is exchanged.

  However, the main control unit 101 here is a CPU unit that includes an external signal input / output unit 101A (I / O) and an interrupt signal input unit 101B that is separate from the external signal input / output unit 101A (I / O).

  In this embodiment, the interrupt signal input unit 101B is connected so that a signal is input from the rotation angle detection unit 72. The rotation angle detection unit (timing detection means) 72 outputs a predetermined timing detection signal at a timing when the roll 1R to be unwound rotates by a predetermined rotation angle, and the timing detection signal is output to the CPU unit 101 as the interrupt signal. input. Along with this input, the CPU unit 101 executes the priority program, and the roll diameter of the roll 1R is reflected based on the unwinding length of the roll 1R unwound during the rotation at the predetermined rotation angle. Calculation processing for calculating the calculated roll diameter reflected value, determination processing for determining whether the roll diameter is less than a predetermined reference value based on the calculated roll diameter reflected value, and based on the determination result Thus, command processing for transmitting command signals to an external device (external various drive units) is performed.

  Note that the rotation angle detection unit 72 of the present embodiment is an optical rotation detection device, and for example, a device configured as an optical rotation sensor (for example, a rotary encoder or a photoelectric sensor) can be used. Specifically, the light receiving state of the detection light output from the light emitting unit is switched between a light receiving state and a non-light receiving state at predetermined rotation angles, and a signal indicating the switching is used as a detection signal. A timing detection signal is output. As shown in FIG. 7, this timing detection signal is an edge signal (rising signal or falling signal) of a pulse signal (axial rotation detection pulse in FIG. 7) output at the timing of switching between the light receiving state and the non-light receiving state. Alternatively, as shown in FIG. 14, the edge signal (rising signal or falling signal) of the output signal (rotation sensor input signal in FIG. 11) that switches ON / OFF at the timing of switching between the light receiving state and the non-light receiving state. ). Here, it is assumed that the latter is adopted, and as a detection circuit 720 for outputting a detection signal (output signal), as shown in FIG. 11, a fiber unit 722 having an optical fiber as a wiring portion for outputting the detection light to the outside, And an amplifier unit 721 that receives detection light input via an optical fiber and outputs a detection signal as an electric signal to the outside at the switching timing based on the input. FIG. 11 shows a conventional configuration. In the present embodiment, the configuration of FIG. 11 is changed to be configured as shown in FIG. 14, but the detection signal output from the rotation sensor 72 is the same as that in FIG. It is.

  In addition, the control unit 100 uses a high-speed counter unit as a high-speed counter unit 103 (unwinding length storage unit) that sequentially stores and updates the unwinding length based on unwinding length information sequentially detected by the unwinding length detection unit 71. Have The high-speed counter unit 103 of the present embodiment provides an external signal input / output unit (built-in I / O) to the unwinding length detection unit 71 that outputs one pulse signal each time the unrolled roll 1R is unrolled for a predetermined length. ) And the count value is incremented by one every time the pulse signal is input. Therefore, the count value is a value reflecting the total unwinding length of the unrolled sheet 1S. In particular, the unwinding length detector 71 of the present embodiment detects the rotational distance of the rotating belt 25, and the rotating belt 25 is a roll 1RB even if the unrolled roll 1R is a roll 1RA. Because it also rotates, even if there is a roll change, the count does not break before and after that.

  The control unit 100 also sends control commands from the main control unit 101 to the external drive units 10 (12), 22 (22C, 22D), 23 (23C, 23D), 24 (24C, 24D), and 40 (42). Upon receiving a signal input, a drive signal based on the input is sent to the external drive units 10 (12), 22 (22C, 22D), and 23 (23C, via an external signal input / output unit (built-in I / O)). 23D), 24 (24C, 24D), and 40 (42) to output and drive the output control unit (output control means) 102 here has an output unit.

  In this embodiment, the main control unit 101, the high-speed counter unit 103, and the output control unit 102 exist as different units, and as shown in FIG. 103 and the output control unit 102 through the data bus 104, and the external wiring 105 is directly connected to each other's external signal input / output unit (built-in I / O), and is also connected through the external direct wiring 105. To do.

  Here, the processing flow of the priority program executed in the present embodiment will be described with reference to FIGS.

  The rotation angle detector 72 outputs the timing detection signal (timing detection means) that can specify the timing as it detects that the roll 1R to be unwound has made a predetermined rotation angle, and this timing detection signal is the main signal. The interrupt signal input unit 101B of the control unit 101 is directly input as an interrupt signal. As a result, the main control unit 101 recognizes that the roll 1R to be unwound has rotated a predetermined angle. Then, as shown in FIG. 5, the main control unit 101 executes the priority program in accordance with the direct input of this interrupt signal to the interrupt signal input unit 101B. First, the roll shown in FIG. The diameter calculation process is forcibly started.

  As shown in FIG. 5, the main control unit 101 that has started the roll diameter calculation process first inputs an input capture command signal (as an instruction signal to the high-speed counter unit 103 as the interrupt signal is input to the interrupt signal input unit 101B. Even if it does not go through the internal program, when an input is made to the input terminal defined in the high-speed counter unit 103, a command to automatically and quickly store the current count value of the high-speed counter unit 103 at the time of input in its own register) Direct output (output immediately outside the sequencer when the instruction is executed in the program) (S21). Here, the high-speed counter unit 103 accepts the input capture command signal input via the external direct wiring 105 and detects the rising edge of the input capture command signal (stored in the register at that time). Value) is transmitted to the main control unit 101 via the data bus 104. On the other hand, as the main control unit 101 directly outputs the input capture command signal, the main control unit 101 is in a standby state for receiving the count value from the high-speed counter unit 103 (S22), and receives the count value via the data bus 104, or When the count value transmission completion notification is received from the high-speed counter unit 103 (S23: Yes), the roll diameter calculation process (diameter calculation process) of the roll 1R currently set as the unwinding target is started (S24). ).

  In the conventional roll diameter calculation process, there is a tendency that a wasteful time is spent until the calculation is started, and it is difficult to ensure a fixed time system due to the fluctuation of the time. That is, as shown in FIG. 10, the programmable controller repeatedly performs internal processing (scanning) for issuing an output command to the output unit while judging the situation according to the input signal to the input unit, according to a series of programs inside. Is going. Specifically, as shown in FIG. 11, when executing the internal processing (scanning), the programmable controller first sets and updates input devices used in the program as input processing, and then inputs the input device. The main program process (main process) is executed according to the conditions. After the main program processing ends, the output device output content (command signal) is finalized as output processing, and finally the refresh operation including signal transmission of the finalized output content to the output unit is performed. Perform END processing. Thereby, one internal process (scan) is completed, and the next internal process (scan) is newly executed upon completion.

  Patterns (input signals A to D) as shown in FIG. 13 exist at the input timing of the input signal input during the internal processing (scan). However, the input signals A to D in these patterns are accepted as input to the main program in the next internal processing (scan) input processing, which is adopted for the current internal processing (scan) input processing. Not. That is, once the signal content of the input signal is determined in the input processing, even if the signal content of the input signal is changed during the subsequent main program processing, output processing, and END processing, the change is It is reflected only at the next internal processing (scan). The same applies to internal processing (scanning) in the communication unit.

  For this reason, in the conventional roll diameter calculation process, even if there is a pulse input from the rotation angle detector 72, the current internal process (scan) in the programmable controller is completed, and the next internal process (scan) is performed. Until the process is executed, the roll diameter calculation process based on the pulse input is not performed, and the time is delayed by the waiting time. Specifically, in the conventional configuration, although the count value of the high-speed counter unit 103 necessary for the roll diameter calculation is to be read at the timing when the pulse is input from the rotation angle detection unit 72, the rotation angle Since it cannot be read out without waiting for the next input process at the timing when the pulse is input from the detection unit 72, the count value of the high-speed counter unit 103 read in the input process is larger than the timing value originally intended to be read out. Therefore, the count is increased by the sentence of the waiting time, and the calculation result of the roll diameter calculation is deviated from the desired value. However, in the present embodiment, by using the direct input / output function as shown in FIG. 14, the count value of the high-speed counter unit 103 is immediately read by the direct input of the interrupt signal, and the diameter calculation process starts. In the process based on the calculation result of the diameter calculation process, the command signal is sent directly to the external device (various drive unit drive source) as soon as it is determined (without waiting for the process to end). Since the data is output, the internal processing time (scan time) can be almost ignored, and high calculation accuracy is ensured.

  Here, a specific calculation procedure (calculation method) of the roll diameter (roll thickness) executed in the roll diameter calculation processing will be described.

  As shown in FIG. 7, the unwinding length detection unit 71 outputs a number of pulses (movement distance detection pulses) corresponding to the unwinding length of the sheet 1S from the roll 1R, and the rotation angle detection unit 72 Although the timing detection signal is output as 1R rotates by a predetermined angle, the output interval of the timing detection signal output by the rotation angle detector 72 is output in a shorter cycle as the diameter of the roll 1R becomes smaller. 8A and 8B indicate the magnitude of the rotation angle of the roll 1R when the sheet 1S having the same length is unwound from the roll 1R and sent downstream, and the same unwinding length is shown. Even so, it can be seen that as the roll diameter of the roll 1R increases, the rotation angle of the roll 1R decreases (FIG. 8A), and as the roll diameter decreases, the rotation angle of the roll 1R increases (FIG. 8B). That is, if the roll 1R is rotated by the same rotation angle, it can be said that the unwinding length from the roll 1R is longer as the roll diameter of the roll 1R is larger, and the unwinding length of the roll 1R is shorter as the roll diameter is smaller.

  Under such a tendency, the roll diameter in the present embodiment is obtained by dividing the unwinding length L when the currently unrolled roll 1R is rotated by a predetermined rotation angle by the predetermined rotation angle R, Calculated by multiplying by a predetermined constant (deceleration constant) K. The unwinding length L is a value obtained by subtracting the count value acquired immediately before it from the latest count value acquired from the high-speed counter unit 103. On the other hand, the predetermined rotation angle R is the number of timing detection signals. If arithmetic processing is performed every time a timing detection signal arrives, the number of timing detection signals is one.

  Note that the rotation angle detection unit 72 of the present embodiment is configured to output the timing detection signal as the interrupt signal every time it rotates at an equal angle (here, an angle smaller than one rotation). The unit 101 calculates the roll diameter continuously for a predetermined number of times based on the timing detection signal output as described above, and sets the average value of the roll diameters for the predetermined number of times as the final roll diameter. . Further, the final roll diameter may be a simple average value of the calculated roll diameters for a predetermined number of times. However, in the present embodiment, the predetermined number on the maximum side (arbitrary number) is selected from the roll diameters for the predetermined number of times. 1 or more or more: 2 or more is preferable from the viewpoint of calculation accuracy) and a predetermined number on the minimum side (arbitrary number 1 or more: 2 or more from the viewpoint of calculation accuracy) The average value of the remaining plurality of roll diameter values excluding the value of (which is preferable) is the final roll diameter. Thereby, the calculation accuracy is improved by excluding irregular abnormal values.

  Specifically, the rotation angle detection unit 72 directly inputs the timing detection signal as the interrupt signal to the interrupt signal input unit 101B of the main control unit 101 every time the roll 1R to be unwound rotates by 30 degrees. As shown in FIG. 16, the main control unit 101 first specifies the unwinding lengths between the signals of the eight consecutive timing detection signals, and based on those unwinding lengths. Each roll diameter is calculated, and a data table for storing the calculation results is created. Then, the main control unit 101 adds all data values (roll diameter values) in the created data table to calculate a total value. On the other hand, the main control unit 101 copies the data table to two different storage areas of the built-in memory. Then, the main control unit 101 extracts the maximum data value in the table and the next largest data value in one of the copied data tables, and stores them in a register. In the other table, the smallest data value in the table and the next smaller data value are extracted and stored in a register. Thereafter, the main control unit 101 subtracts the extracted data value from the total value of all data calculated previously. Since the number of stored data in the main table is 7, and two large and small data are deleted from there, the remaining number of data is 3, so that the main control unit 101 obtained by dividing the total value after subtraction by 3 The value is the final roll diameter. In other words, the maximum value and the next largest value (here, two in total) and the minimum value and the next smaller value (here, two in total) are excluded from the roll diameters of the seven calculation results. The average value of the three roll diameters is taken as the final roll diameter. In FIG. 16, the average calculation result by the method (normal average calculation result) and the average calculation result by the conventional moving average (current average calculation result) have the same value. In both cases, a significant improvement in accuracy has been confirmed.

  In the roll diameter calculation process, it is not always necessary to calculate the roll diameter itself, and a roll diameter reflection value that reflects the roll diameter may be calculated. For example, the unwinding length L may be a value obtained by dividing the unwinding length L by the predetermined rotation angle R.

  Returning to FIG. When the roll diameter calculation process (S24) ends, the main control unit 101 determines whether the calculated roll diameter (here, the finally calculated roll diameter as the average value) is less than a predetermined reference value. Determination processing for determining whether or not is executed (S25). If the main control unit 101 determines that the value does not fall below a predetermined reference value, the main control unit 101 causes the sheet unwinding drive unit 10 to continue the normal unwinding process (S26).

  In the normal unwinding process, when the above-described sheet extension process 200 is not performed, the tension of the sheet 1 </ b> S pulled in by the sheet supply driving unit 50 is maintained at the upstream tension corresponding to the above-described predetermined downstream tension. As described above, based on the detection information (tension information (tension information) of the sheet 1S) of the tension detection unit 60, the main control unit 101 detects the tension of the sheet 1S (tension detection means), and further, based on the detected tension. The sheet 1S is unwound. More specifically, a predetermined downstream tension in which the tension of the sheet 1 </ b> S sent downstream from the sheet supply driving unit 50 satisfies the demand of the processing apparatus (processing drive unit) 90 provided downstream of the sheet supply driving unit 50. As described above, the control unit 500 (here, a CPU different from the control unit 100: see FIG. 2) drives and controls the sheet supply driving unit 50 (drive source 52) based on the detection result of the tension information detection unit 80. Among them, the main control unit 101 that executes the normal unwinding process sends out the sheet 1S sent from the upstream side to the sheet supply drive unit 50 by the sheet supply drive unit 50 with the predetermined downstream tension. The optimum tension (upstream tension) necessary for this is calculated, and the unwinding speed of the sheet 1S by the sheet unwinding drive means 10, that is, the drive source 12 so as to be the calculated upstream tension. And it controls the rotation speed. During the normal unwinding process, the path length variable drive means 40 (drive source 42) is in a stopped state (see FIG. 3A).

  The tension information detection unit 80 applies a rotation suppressing force to the rotating member 81 (arm), a direction changing guide 82 (guide roller) fixed to the outer peripheral side of the rotating member 81, and the rotating member 81. A rotation suppression means 83 and a rotation angle detector 84 (such as a rotary encoder) for detecting the rotation angle of the rotary member 81 are provided, and are configured in the same manner as the tension detector 60.

  On the other hand, when it is determined that the main control unit 101 is below the predetermined reference value, here, the main control unit 101 outputs a command signal for causing the sheet extension driving unit 20 to execute the sheet extension process 200 shown in FIG. (S27). As a result of the output, the main control unit 101 executes the sheet extension process execution information indicating execution / non-execution of the sheet extension process 200 included in various storage information in the I / O memory area from the information indicating non-execution. Switch to the information shown. Thus, when the sheet extension process execution information is read by the next input process, the sheet extension process 200 is executed by the main program immediately after that, and the process shown in FIG. 6 is started.

  Here, the sheet extension process will be described with reference to FIGS. 6, 3 </ b> A to 3 </ b> J, and FIG. 4.

  During the sheet extension process, the main control unit 101 controls the sheet unwinding drive means 10 (drive source 12) to control the unwinding amount (unwinding speed) of the sheet 1S from the unrolled roll 1R. In order to adjust the feeding amount of the sheet to the sheet supply driving means 50 that is increased or decreased according to the change while changing variously, the path accumulation variable driving means 40 (drive source 42) is driven to control the sheet accumulation path. 3 is changed, the drive control (path length variable control) 400 of this path length variable drive means 40 (drive source 42) is routed through this sheet storage path 3 (the sheet storage means 30 is changed). Based on the detection information of the tension detector 60 (the tension of the sheet 1S (tension information)) so that the tension of the sheet 1S sent to the sheet supply driving means 50 has the predetermined upstream tension. Dividing it is premised, tension of the seat 1S fed into the sheet feed drive means 50 is adjusted continually.

  As shown in FIG. 6, when the main control unit 101 reads information for executing the sheet extension process in the immediately preceding input process, the main control unit 101 first drives and controls the sheet unwinding drive means 10 (drive source 12) to unwind the object. The sheet 1S unwinding (unwinding speed) from the roll 1R is decelerated (S41: refer to FIG. 3B), and in the process where the unwinding of the sheet 1S starts and stops (zero speed) is insufficient. The path length variable driving means 40 is driven and controlled so that the sheet feed amount to the sheet supply driving means 50 is compensated, and the path length of the sheet accumulation path 3 is shortened to store the sheets 1S accumulated therein. The accumulated amount is reduced and sent to the sheet supply driving means 50 (S42: see FIG. 3B). The principle here in the present embodiment is executed in a form that traces a predetermined deceleration change (here, in particular, a constant deceleration (acceleration) deceleration change), and all the tensions of the seat 1S change in the path length. Adjusted by.

  Next, the main control unit 101 determines whether or not the unwinding (unwinding speed) of the sheet 1S is stopped (S43: determination process). This determination can be made based on the detection result of the unwind length detection unit 71. When it is determined to be stopped (when unwinding is stopped: S43: Yes), the main control unit 101 causes the sheet extension driving unit 20 to execute the sheet extension process 200. In the sheet extension process 200, as described above, the main control unit 101 drives and controls the stop holding means 21 (pressing drive units 23C and 23D), and has already been unwound from the current roll 1R to be unwound. While holding the stopped state of the sheet 1S, the sheet end 1t downstream from the stop holding position of the sheet 1S (which forms the sheet intermediate portion instead of the sheet end portion) and the next roll The sheet end 1s of 1R is adhered (S44: see FIG. 3C). Further, the main control unit 101 drives and controls the cutting unit 22 (cutting drive units 22C and 22D) in the stop and hold state, and cuts the sheet 1S on the current roll 1R side upstream of the stop and hold unit 21. The sheet end 1t is formed (S45: see FIG. 3D), and then the switching means 24 (24C, 24D) is driven and controlled, and the roll to be unwound by the sheet unwinding drive means 10 is changed from the current roll 1R to the next roll 1R. (S46: see FIG. 3E). Then, after the roll is switched, the main control unit 101 cancels the stop holding state of the sheet 1S by the stop holding unit 21, and makes the succeeded sheet 1S ready to be sent (S47: see FIG. 3F).

  After the sheet splicing process (S44, S45) and the roll switching process (S46) are completed and the stop and hold state of the sheet 1S is released (S47), the main control unit 101 controls the path length variable drive unit 40. Thus, while the path length of the sheet accumulation path 3 continues to be shortened, the sheet 1S is unwound (unwinding speed) from the roll 1R newly targeted for unwinding by the sheet unwinding drive means 10 (drive source 12). Is shifted from the stopped state to the accelerated state (S48: see FIG. 3G). In this embodiment, the acceleration here is executed in the form of tracing a predetermined acceleration change (in particular, the acceleration change with a constant acceleration in this case), and the tension of the sheet 1S is all adjusted by the path length change. .

  Then, the main controller 101 determines that the unwinding (unwinding speed) of the sheet 1S from the next roll 1R by the sheet unwinding driving means 10 (drive source 12) is the same level as the normal unwinding (a predetermined normal speed). When the unwinding speed is reached, the unwinding (unwinding speed) is temporarily brought into an acceleration stop state (S49). Along with this, the path length shortening change of the sheet accumulation path 3 by the variable path length driving means 40 is also stopped, and only the path length change of the sheet accumulation path 3 for adjusting the tension of the sheet 1S is obtained. With the transition to the acceleration stop state, the main control unit 101 activates a built-in timer, and after a predetermined time has elapsed, the unwinding (unwinding speed) of the sheet 1S is set to the reaccelerated state.

  However, due to this re-acceleration, the unwinding (unwinding speed) of the sheet 1S becomes a high-speed unwinding state (sheet accumulation speed) faster than the normal unwinding (see FIG. 3H). The main control unit 101 increases the accumulation amount by increasing the length of the sheet accumulation path 3 so that the excessive amount of the sheet 1S fed to the sheet supply driving means 50 in this high-speed unwinding state is absorbed. The accumulated sheets are sent out to the sheet supply driving means 50 (S50: see FIG. 3H). In other words, the sheet 1S unwinding speed becomes higher than that during normal unwinding, so that the sheet 1S unrolled to the sheet accumulation path 3 is in an excessive state, and at this time, the path length of the sheet accumulation path 3 is increased. By changing in this way, a part of the excessively unrolled sheet 1S is absorbed and accumulated in the sheet accumulation path 3, and only the remaining can be sent to the sheet supply driving means 50. In this high-speed unwinding state, when the unwinding speed of the sheet 1S reaches a predetermined speed, the sheet 1S is held at a constant speed.

  Next, the main control unit 101 detects that the position detection unit 48 has reached the predetermined position before the standby position of the fixing member 35 where the sheet accumulation path 3 is in the predetermined longest position (S51: Yes). ), The unwinding of the sheet 1S from the next roll 1R by the sheet unwinding driving means 10 (drive source 12), and the unwinding (unwinding speed) of the sheet 1S when the longest state is detected is the normal unwinding The sheet accumulation is performed so as to shift to an asymptotic state (here, a deceleration state) in which asymptotically approaches the same normal unwinding state, and the sheet 1S feed amount to the sheet supply driving means 50 that is excessive in that asymptotic state is absorbed. The accumulated sheets 1S are sent out to the sheet supply driving means 50 in a form in which the path length of the path 3 is increased to increase the accumulation amount (S52: see FIG. 3I).

  When the position detection unit 46 detects that the standby position of the fixing member 35 has reached the predetermined position where the sheet accumulation path 3 is in the predetermined longest state (S53: Yes), the main control unit 101 detects the sheet. Unwinding of the sheet 1S from the next roll 1R by the unwinding drive means 10 (drive source 12) is set to the same normal unwinding state as that during normal unwinding, and the path length variable drive means 40 (drive source 42). The change in the path length of the sheet accumulation path 3 is stopped when the fixing member 5 enters the standby state (S54: refer to FIG. 3J). As a result, in the next sheet extension process, the sheet thickness does not fall below a predetermined reference value unless a trouble occurs, so the process returns to the above-described normal unwinding process (S26 in FIG. 5).

  As described above, the sheet feeding device and roll diameter computing device 1 according to the present embodiment includes the sheet unwinding driving unit 10 that unwinds the sheet 1S from the roll 1R, and the sheet conveyance path (the above-described sheet 1S) that is unrolled. Various direction change guides 9, 19, 31, 32, 62, 51 that are arranged at various points along the route to guide the direction change of the sheet 1S so as to be sent downstream along the sheet 8 (including the sheet accumulation route). (Guide roller) and sheet supply driving means 50 for applying a driving force to feed downstream to the sheet 1S of the path, and flexible sheet 1S as a work material wound around a roll The sheet 1S unwound by the unloading drive means 10 is emptied in the process of being sent (supplied) downstream by the downstream sheet supply drive means 50. The sheet edge 1s of the roll 1R and the sheet end 1s of the next roll 1R, footsteps on which the sheet stop state is switched from the current roll 1R to the next roll 1R.

  At the time of the switching, in order to continuously supply the sheet 1S to the sheet supply driving unit 50 without interruption, a sheet accumulating unit 30 for storing the sheet 1S is provided downstream of the roll 1R, and the sheet splicing is performed. When the required sheet unwinding is stopped (during the sheet unwinding time), the sheet accumulated in the sheet accumulating means 30 is sent downstream to gain time. When the sheet joining is completed and the roll unwinding is resumed, Return to normal unwinding supply. The sheet accumulating unit 30 repeatedly changes the direction of the sheet 1S in a reciprocating manner to increase the sheet length to make a storage, and a plurality of direction changing rolls 31 positioned on the reciprocating proximal end side are provided on the other end side. The storage is released by approaching (advancing) the plurality of direction change rolls 32 that are fixedly positioned on the sheet, and when returning to the normal unwinding supply, the storage is released (retracted) to the original position, and the next sheet joining is performed. Prepare for.

  If the direction changing roll 31 on the base end side in the sheet accumulating means 30 is configured to passively move by an air cylinder or a weight (weight), even if the unwinding of the roll 1R is stopped at the time of sheet joining. Since the downstream sheet supply driving means 50 continues to drive the upstream sheet 1S to draw and send (supply) the downstream sheet 1S, pulling to the upstream sheet 1S is always continued. However, since the unwinding of the sheet 1S on the upstream side is stopped, the pulling force gradually increases, and as a result, the sheet 1S is pulled together with the direction change roll 31 on the proximal end side, By approaching the direction changing roll 32, the “accumulation” of the sheet accumulating means 30 is released. In other words, in this configuration, the tension of the sheet 1S at the time of sheet joining depends on the pulling from the downstream, and in some cases, an excessive tension may be applied to the sheet 1S temporarily. It is difficult to accurately manage the tension of the sheet 1S.

  However, with the configuration of the above-described embodiment, the movement of the proximal direction changing roll 31 for releasing the “storage” of the sheet accumulating means 30 is not a passive load such as an air cylinder or a weight (weight). A drive motor 35 is used. The drive motor 35 actively moves the base-direction direction changing roll 31 of the sheet accumulating means 30 closer to the other-end side direction changing roll 32 so that the sheet 1S stored at an optimal timing and speed is downstream. Since the sheet (material) 1S can be prevented from being over-tensioned, it is possible to perform control friendly to the sheet 1S. Further, a tension detection unit 60 is provided downstream of the sheet accumulating unit 30, and tension information (tension signal) at the time of sheet joining is transmitted from the tension detection unit 60 to the drive motor 35, and the drive motor 35 receives the sheet 1S at the time of sheet joining. Is driven to maintain an appropriate tension, the tension of the sheet 1S can be managed with high accuracy. During normal unwinding (normal operation), the tension information of the tension detector 60 is sent to the unwinding drive motor 12 of the roll 1R, and the unwinding motor 12 is set so that a predetermined tension is generated on the unrolled sheet 1S. Feedback control is performed.

  The sheet supply drive unit 50 is downstream of the tension detection unit 60. This sheet supply drive unit 50 is tension information (tension signal) of the tension information detection unit 80 of the processing line downstream of the sheet supply drive unit 50. ), The drive motor 55 of the sheet supply drive means 50 is feedback-controlled. Various processing lines can be employed downstream from the sheet supply driving unit 50.

  Further, in the sheet supply device / roll diameter computing device 1 of the present embodiment described above, when the roll diameter of the roll 1R to be unwound (the outer diameter of the roll 1R) reaches a predetermined reference value (limit value: shaft diameter + Δα). Then, the rotation of the roll 1R is stopped by the sheet unwinding driving means 10 (precisely, deceleration for stopping the roll is started), and the sheet splicing process is performed. In this case, since it is important to determine the optimal sheet joining timing (deceleration start timing of unwinding of the sheet 1S), in this embodiment, the roll diameter calculation process is preferentially started from the direct input by the interrupt signal. Configured to start. As a result, the internal processing time (scan time) of the programmable controller 101 can be substantially ignored, and a wasteful waiting time for waiting for the end of the internal processing does not occur, so that high calculation accuracy can be secured. As a result, it is possible to determine the optimum sheet joining timing, and it is possible to reduce the environmental load by saving sheets and reducing waste.

  Incidentally, the main control unit (main control means) 101 of the present embodiment is one control device that executes both the priority program and a series of programs including the main program, and at least input as the series of programs. The processing, the main program processing, and the output processing are executed in this order, and the series of processing is executed repeatedly. The input period of the timing detection signal as the interrupt signal is gradually shortened as the roll diameter decreases, but the diameter calculation processing is repeated as it is executed as a priority program executed at the input timing of the interrupt signal. The series of programs can be executed in a cycle shorter than the program execution period for one cycle. However, in operation, it is not always necessary to execute the priority program at a cycle shorter than the program execution period for one cycle of a series of programs.

  Here, an example of processing of the main program (see FIGS. 12 and 13) will be described. The main program is a predetermined series of programs executed based on various input information acquired in the immediately preceding input process. For example, the main program and the roll diameter computing device 1 and a downstream processing device (processing drive) Part) integrated drive control with 90 (control to reflect the detection result of either device 1 or device 90 on the other drive), abnormality detection processing or abnormality such as alarm output or emergency stop based on abnormality detection Either or both of the coping processes. In this embodiment, as shown in FIG. 1A and FIG. 1B, an abnormality detection unit 9 (here, reference numerals 9a and 9b) that detects an abnormality of the unrolled sheet 1S is provided, and the abnormality is detected as a main program. In this case, a program for outputting an alarm or executing an abnormality handling process for stopping unwinding of the sheet 1S is included. Specifically, the main control unit 101 acquires the detection information of the abnormality detection unit 9 in the input process (abnormality detection unit), and if the acquired detection information is abnormality information indicating abnormality, in the main program, A predetermined alarm is output and the drive sources 12 and 52 are stopped to forcibly stop the unwinding / feeding of the sheet 1S from the roll 1R (abnormality coping means). Here, the abnormality detection unit 9a detects whether or not the sheet 1S being sent out is cut, and the abnormality detection unit 9b is formed by the sheet splicing process of the sheet 1S being sent out. It detects the presence or absence of a seam (bonding part: for example, a double-sided tape used for bonding). Naturally, if the sheet 1S is cut, it is abnormal, and before and after the seam of the sheet 1S, sheet portions where product formation is impossible are possible. Further, an abnormality detection unit 9 that detects an appearance abnormality (turning, dirt, shape abnormality, misalignment, etc.) based on an image taken by an image photographing unit such as a camera may be provided. Here, regarding the seam of the sheet 1S and other abnormalities, the downstream processing apparatus (processing drive unit) 90 is used for a part of the integrated control so that only the workpiece in which the abnormality has occurred is discharged.

  In addition, although the above-mentioned diameter calculation process (refer FIG. 5) is performed as a priority program as mentioned above, you may make it incorporate in a main program after the determination of S25.

  As mentioned above, although one Embodiment of this invention was described, this is only an illustration to the last, and this invention is not limited to this. For example, various modifications based on the knowledge of those skilled in the art are possible, such as omitting some of the configuration requirements in the above-described embodiment and further adding other configuration requirements.

  For example, in the above embodiment, in the process of FIG. 6, the control unit 101 instructs the unwinding speed to the sheet unwinding driving means 10 to trace the speed change determined in advance in each step, and the path length. The tension of the sheet 1S sent to the sheet supply driving means 50 is adjusted according to the instruction of the path length changing speed to the variable driving means 40. Conversely, the path length changing speed to the path length variable driving means 40 is It is instructed to trace a predetermined speed change in each step, and the tension of the sheet 1 </ b> S sent to the sheet supply driving unit 50 may be adjusted according to the instruction of the unwinding speed to the sheet unwinding driving unit 10. . In addition, the control unit 101 may change the speeds of both at each step in order to adjust the tension of the sheet 1 </ b> S sent to the sheet supply driving unit 50.

  In the above-described embodiment, the sheet 1S is unwound from the roll 1R, and when the roll diameter becomes small, the next roll 1R is taken over to extend the sheet 1S and unwind when the sheet 1S is extended. The sheet supply device is configured to send out the sheet 1S accumulated in the path 3 in place of the unwound sheet 1S and detect and adjust the tension of the sheet. With regard to this configuration, calculation of another method may be adopted for the diameter calculation processing for calculating the roll diameter (roll diameter reflected value), and the configuration for the calculation may also adopt another configuration. Good.

  Moreover, although the said embodiment is a roll diameter calculating apparatus which starts a diameter calculating process by the interruption signal to the main control part 101, if it concerns regarding this structure, you may employ | adopt also for the other apparatus which unwinds a roll. .

DESCRIPTION OF SYMBOLS 1 Sheet supply apparatus, roll diameter calculating apparatus 1R roll 1S sheet 10 Sheet unwinding drive means (sheet unwinding drive means)
12 Unwinding drive source 20 Sheet extension driving means (sheet joining means, sheet extending means)
21 Stop holding means 22 Cutting means 23 Adhesive means 24 Switching means (switching means)
30 Sheet storage means (sheet storage means)
3 Sheet accumulation path 3L Straight path 31, 32 Direction conversion guide (guide roller)
33 First Side Direction Conversion Guide Group 34 Second Side Direction Conversion Guide Group 35 Fixing Member (Ball Screw Slider)
40 Path length variable drive means (path length variable drive means)
43 Linear movement guide (ball screw screw shaft)
46, 47, 48 Position detector 50 Sheet supply driving means (sheet supply means)
52 Sheet supply drive source (sending drive source)
60 Tension detection means (tension detection means)
70 Roll diameter acquisition means 80 Tension detection means (tension detection means)
100 control unit (control means: sheet unwinding control means, accumulated sheet discharge control means, sheet extension control means, tension control means)
101 Main control unit (CPU unit: main control means)
102 Output control unit (output unit: output control means)
103 High-speed counter section (winding length storage means)
500 Control means (sheet supply means)

Claims (9)

Sheet unwinding drive means for unwinding the sheet from a roll around which the sheet is wound;
Unwinding length detection means for detecting unwinding length information indicating the unwinding length of the unwound sheet;
Timing detection means for outputting a timing detection signal in accordance with detection of the timing at which the roll that rotates during unwinding of the sheet rotates by a predetermined angle;
As a programmable controller capable of executing a predetermined series of programs and capable of direct input by an interrupt signal for preferentially executing a predetermined priority program even during execution of the series of programs When the timing detection signal is input as the interrupt signal, the priority program is executed starting from the input, and based on the detection contents of both the unwinding length detection means and the timing detection means, A diameter calculation process for calculating a predetermined roll diameter reflection value that reflects the roll diameter of the roll to be unwound, and a reference value for which the roll diameter is predetermined based on the calculated roll diameter reflection value. A determination process for determining whether or not the value is below and a command process for transmitting a command signal to the external device based on the determination result. And control means having a main control means for,
A roll diameter computing device comprising:   The main control means is one control device that executes both the series of programs and the priority program, and executes input processing, main program processing, and output processing in this order as the series of programs. 2. The control device that executes a series of processes in a repetitive manner, and is capable of executing the diameter calculation process in a cycle shorter than a program execution period of one cycle of the series of repeated programs. Roll diameter calculator. An unwinding length storage unit that sequentially stores and updates the unwinding length based on unwinding length information that the unwinding length detection unit sequentially detects;
The main control means performs a current unwinding length acquisition process of reading and acquiring the current unwinding length from the unwinding length storage means as the priority program as the timing detection signal is input as the interrupt signal. The roll diameter calculating apparatus according to claim 1 or 2 to be executed.   The main control means stores the unwinding length stored in the unwinding length storage means as a direct output based on the current unwinding length acquisition process when the timing detection signal is directly input as the interrupt signal. The roll diameter according to claim 3, wherein the diameter calculation process, the determination process, and the command process are executed upon completion of acquisition of the unwinding length from the unwinding length storage unit. Arithmetic unit.   The roll diameter calculation device according to any one of claims 1 to 4, further comprising output control means for receiving the command signal from the main control means and outputting a drive command to the external device.   The roll diameter calculation device according to claim 5, wherein the main control unit transmits the command signal as a direct output based on the command process to the output control unit.   When the roll diameter is determined to be lower than a predetermined reference value by the determination process, the main control unit outputs the command signal to the output control unit from the roll to the sheet unwinding drive unit. When a stop command signal for stopping the unwinding of the sheet is output and the unwinding of the sheet from the roll is stopped, the command signal is output to the output control means as the command signal. An execution command signal for causing the sheet splicing driving means for executing the sheet splicing process to join the sheet end of the next roll to the sheet end to execute the sheet splicing process is output, and the output is output when the sheet splicing process is completed. Roll switching for executing roll switching processing for switching the roll unwound by the sheet unwinding driving unit to the next roll as the command signal to the control unit Roll diameter calculating apparatus according to any one of claims 1 to 6 outputs an execution command signal for executing the roll switch processing motion means.   In the diameter calculation process, the calculation of the roll diameter reflected value is continuously executed a predetermined number of times, and from the roll diameter reflected value obtained for the predetermined number of times, a plurality of values on the maximum side and a plurality of values on the minimum side are obtained. The roll diameter calculation device according to any one of claims 1 to 7, wherein an average value of a plurality of remaining roll diameter reflected values is used as a final roll diameter reflected value.   The roll diameter calculation device according to claim 1, wherein the timing detection unit is an optical rotation detection device.