TW201616255A - Material sheet tension control system, method, computer-readable recording medium and computer program product - Google Patents

Abstract

A material sheet tension control system includes one or multiple first transfer rolls and second transfer rolls. The first transfer rolls are brought to rotate by a first driving device to continuously draw the material sheet to transfer along a material feeding path. The second transfer rolls are installed at the other end of the material feeding path and are brought to rotate by a second driving device to stepwise draw the material sheet to a processing device for processing. A swing roll, which is installed at the material feeding path between the first transfer roll and the second transfer roll, is brought by a tension of the material sheet to swing along a path to change the stroke of the material sheet. A displacement calculating device is set at one side of the swing roll to record the boundary positions of the swing roll and transfer the boundary positions to a control unit. The control unit compensates or reduces a rotating speed of the first driving device based on the boundary positions.

Description

Sheet tension control system, method, computer readable recording medium, and computer program product

The invention relates to a control device and a control method thereof, in particular to a material tension control device and a control method thereof.

The general packaging bag manufacturing machine mainly comprises the following parts: a feeding mechanism for providing a plastic film raw material, a folding mechanism for folding the plastic film, and a cutting machine for cutting the folded plastic film into two pieces. The cutting device and the heat sealing device for sealing the two plastic films into a plastic bag. The processing flow is as follows: firstly, the plastic film with the pattern printed on the two sides is folded in half by the folding mechanism by the feeding device, and then the material is cut into corresponding two plastic films by the cutting device. The plastic film is conveyed along two different paths, and finally, the two sheets are processed and sealed correspondingly through a heat sealing device, thereby completing the packaging bag. The bag making machine often causes the tension of the web to continuously change due to the variation of the environmental parameters during the feeding process. Under such a process, the output of the web will be uneven due to the proportion of the stretching. The output of the material has a wide width, which will cause the plastic film to be inconsistent when the subsequent material is sealed, thereby damaging the aesthetics of the package.

In the feeding mechanism, in order to solve the problem that the plastic film is changed in the travel distance due to the difference in front and rear speeds during the conveying process, a swing roller is usually provided therebetween to drive the plastic film up and down (or front and rear) to move with the plastic film. Travel distance and maintain appropriate When the tension. In the conventional technique, when the rocking roller is driven by the plastic film, it will continue to swing back and forth through the plastic film until it touches the sensor corresponding to the vertex. However, the tension rollers provided by the rocking rolls at different heights are not the same, so that the plastic film is subjected to different tensions at each output, so that the degree of stretching of the web cannot be fixed, and the output of the plastic film is often uneven. Qi situation.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that the conventional feeding mechanism has a tension unevenness due to uneven tension due to the tension of the web.

In order to solve the above problems, the present invention provides a web tension control system for controlling the tension of a web, the control system comprising one or more first conveying rollers and a second conveying roller, the first conveying roller a driving device drives the rotation to continuously pull the web to be conveyed along a conveying path, and the second conveying roller is disposed at the other end of the conveying path, and the second driving device drives the rotation to pull the web in a stepwise manner Processing to a processing device, the feeding path between the first conveying roller and the second conveying roller is provided with a tension along the path by the tension of the web to change the stroke of the web. a rocking roller, a displacement calculating device is disposed on the side of the rocking roller, the position information of the rocking roller is recorded, and the position information is transmitted to the control unit, and the control unit compensates or reduces the first driving device based on the position information. Rotating speed.

Further, the control unit prestores a displacement upper limit value and a displacement lower limit value, and the control unit continuously records the position of the swing roller by the displacement calculation device, and swings to the displacement upper limit at the swing roller Value is passed The speed command is sent to the first driving device, and a deceleration command is transmitted to the first driving device when the rocking roller swings to the displacement lower limit value.

Further, the control unit prestores a first threshold value and a second threshold value, and the control unit records the first boundary position of the rocking roller by the displacement calculating device when the swing roller swings to the first boundary. And calculating an error value between the first boundary position and the first threshold value, converting the first compensation parameter to the first driving device to correct the rotation speed of the first driving device, wherein the control unit is coupled to the swing roller The second boundary position of the rocking roller is recorded by the displacement calculating device when swinging to the second boundary, and the error value between the second boundary position and the second threshold is calculated and converted into a second compensation parameter and transmitted back to the first A driving device to correct the rotational speed of the first driving device again.

Further, the control unit prestores a first buffer position and a second buffer position, and the control unit acquires the swing roller by the displacement calculation device after the first predetermined time elapses from the second buffer position. Positioning the oscillating roller as a first reference position, and calculating an error value of the first reference position and the first buffer position as a first compensation parameter is transmitted back to the first driving device to correct the first driving device And the control unit obtains the position of the swing roller as the second reference position by the displacement calculating device after the second predetermined time elapses from the first buffer position, and calculates the second position The error value of the reference position and the second buffer position is converted into a second compensation parameter and transmitted back to the first driving device to correct the rotation speed of the first driving device again.

Further, the displacement computing device is a resistor, the resistor The ruler includes a housing fixed to the machine base, a resistive slide rail disposed on the housing, and a slider abutting on the side of the swing roller and being displaced by the swing roller.

Further, the oscillating roller comprises a pivot, a roller pivoted on the pivot and driven by the web, and a guiding mechanism for the pivot to swing along the path.

Further, the second driving device is a servo motor.

Another object of the present invention is to provide a web tension control method, which comprises: predefining a displacement upper limit value and a displacement lower limit value; and continuously recording the position of the rocking roller by the displacement calculating device; When the rocking roller swings to the upper limit of the displacement, an acceleration command is transmitted to the first driving device; and when the rocking roller swings to the lower limit of the displacement, a deceleration command is transmitted to the first driving device

Another object of the present invention is to provide a web tension control method, the method comprising: predefining a first threshold value and a second threshold value; and recording the swing roller when the rocking roller swings to a first boundary a boundary position; calculating an error value of the first boundary position and the first threshold value and converting the first compensation parameter back to the first driving device to correct the rotation speed of the first driving device; Recording a second boundary position of the rocking roller when returning to a second boundary; calculating an error value of the second boundary position and the second threshold value and converting the second compensation parameter to a second driving parameter for returning to the first driving device for correction The rotational speed of the first drive.

Another object of the present invention is to provide a web tension control method, the method comprising: predefining a first buffering position and a second buffering position; wherein the rocking roller passes the first buffering position and passes the first predefined After time, get Positioning the rocking roller as a first reference position; calculating an error value of the first reference position and the first buffer position obtained by the displacement calculating device and converting the first compensation parameter to a first compensation parameter and transmitting the first compensation parameter to the first driving device Correcting the rotation speed of the first driving device; after the second predetermined time elapses from the first buffer position, obtaining the position of the rocking roller as the second reference position; calculating the obtained by the displacement computing device The error value of the second reference position and the second buffer position is converted into a second compensation parameter and transmitted back to the first driving device to correct the rotation speed of the first driving device.

Another object of the present invention is to provide a computer readable recording medium on which a program is recorded, and when the computing host loads the program and executes it, the method as described above can be performed.

Another object of the present invention is to provide a computer program product that can perform the method as described above when the computer program product is loaded into a computer for execution.

The present invention has the following superior effects over the prior art:

1. The present invention controls the stroke displacement of the rocking roller by the displacement stroke device, and effectively controls the length of each material output, so that the stretch of the web is maintained at the same tension each time.

2. The invention controls the height of each stroke of the rocking roller by setting the first critical value and the second critical value, effectively controlling the length of each output of the web, so that the stretching of the web is maintained at the same time each time. tension.

100‧‧‧Plastic bag making machine

200‧‧‧Material tension control system

10‧‧‧Control unit

20‧‧‧Feeding device

21‧‧‧Feed Roll

22‧‧‧Material institutions

221‧‧‧ tray

222‧‧‧ pivot

223‧‧‧ Telescopic cylinder

30‧‧‧First transfer roller

31‧‧‧ driven roller

32‧‧‧First drive

40‧‧‧Drawing device

41‧‧‧ Calibration Roller

42‧‧‧ turning rolls

43‧‧‧ sensor

44‧‧‧First turning roll

45‧‧‧Second turning roller

50‧‧‧First path feed roller

60‧‧‧Second path feed roller

70‧‧‧Wave Roller

71‧‧‧Upside swing roller

72‧‧‧Bottom swing roller

73‧‧‧ turning wheel

74‧‧‧Guiding agency

75‧‧‧ Slider

76‧‧‧ Connecting rod

80‧‧‧displacement computing device

90‧‧‧Second transfer roller

91‧‧‧Second drive

92‧‧‧ driven roller

P‧‧‧ plastic film roll

L1‧‧‧Direct path

L2‧‧‧ lateral path

T1‧‧‧ upper side feeding path

T2‧‧‧ lower side conveying path

S21-S24‧‧‧Steps

S31-S35‧‧‧Steps

S41-S47‧‧‧Steps

Figure 1 is a side view of a plastic bag making machine.

Figure 2 is a schematic view of the upper side of the plastic bag making machine.

Figure 3 is a side view of the N-N plane to the P-P plane of Figure 2;

Fig. 4 is a side view showing the K-K plane to the Y-Y plane of Fig. 2;

Figure 5 is a block diagram of the web tension control system of the present invention.

Fig. 6 is a schematic flow chart of the method (1) for controlling the tension of the web of the present invention.

Figure 7 is a schematic flow chart of the method (2) for controlling the tension of the web of the present invention.

Figure 8 is a schematic flow chart of the method (3) for controlling the tension of the web of the present invention.

The detailed description and technical contents of the present invention will now be described with reference to the drawings. In addition, the drawings in the present invention are for convenience of description, and the proportions thereof are not necessarily drawn to actual scales, and the drawings and their proportions are not intended to limit the scope of the present invention, and are described herein.

Please refer to FIG. 1 for a side view of a plastic bag manufacturing machine incorporating the tension control system of the present invention. As shown in the drawings, the following description is directed to a preferred embodiment of the present technology. The present invention can be applied to a plastic bag manufacturing machine 100, which is 100 The control unit 10 (shown in FIG. 5), the feeding device 20, the first conveying roller 30, the cutting device 40, the first path feeding roller 50, the second path feeding roller 60, and the upper and lower swing rollers 71 are included. 72, a displacement calculating device 80, and a second conveying roller 90.

The control unit 10 is preferably a Programmable Logic Controller (PLC), which is a digital logic controller for automatic control, and has a control command loaded into the memory. The function of storing and performing in the body. The control unit 10 may be, but not limited to, a central processing unit (CPU), a microprocessor (Microprocessor), a digital signal processor (DSP), Application Specific Integrated Circuits (ASICs), Programmable Logic Devices (PLDs), or other similar devices or combinations of these devices.

The feeding mechanism 20 has a loading roller 21 for placing a plastic film roll P (web), and a side of the loading roller 21 is provided with a support for supporting the plastic film roll P. The material feeding mechanism 22 includes a tray 221, a pivot 222 disposed at one end of the tray 221, and a telescopic cylinder 223 that pushes the tray 221 in the upper and lower directions. The tray 221 is attached to the lower side of the film roll P and is pivotable relative to the pivot 222. The telescopic cylinder 223 has a push arm fixed to one side of the tray 221. The telescopic arm can push the tray 221 to pivot relative to the pivot 222 to raise or lower the tray 221 .

A side of the first conveying roller 30 is provided with a driven roller 31 for clamping the web from both sides with the first conveying roller 30 (plastic film roll P). The first conveying roller The 30 series is rotated by the first drive unit 32 to control the rotational speed of the web. The first driving device 32 is coupled to the control unit 10 described above, whereby the rotation speed of the first driving device 32 can be controlled by the control unit 10. The first driving device 32 can be, but not limited to, a stepping motor, such as a permanent magnet motor (PM Motor), a variable reluctance motor (VR Motor), Hybrid Motor (HB Motor), Disc Magnet Motor, Outer Rotor Motor, Linear Stepping Motor, or Servo Motor For example, a DC Servo Motor, a PMAC Servo Motor, and an Induction AC Servo Motor are not limited in the present invention.

The cutting device 40 is disposed at a rear portion of the first conveying roller 30, and the cutting device 40 is provided with a calibration roller 41 corresponding to one side. Please refer to "FIG. 2" as a schematic diagram of the upper side of the plastic bag manufacturing machine 100. After the web passes through the first conveying roller 30, the web is turned by the turning path 42 from the straight path L1 (as shown in FIG. 3, which corresponds to the upper and lower directions in FIG. 3). The lateral path L2 (shown in FIG. 3, which is equivalent to the left and right directions in FIG. 3) is wound around the calibration roller 41. One side of the calibration roller 41 is provided with a sensor 43. The sensor 43 is configured to align one side of the web for searching a boundary position of the web, and driving the calibration roller 41 up and down by a driving device (not shown) to enable the material to be aligned. At the correct height, it is aligned to the desired cutting position when the cutting device 40 is cut in the rear stage (as shown in FIG. 4). The cutting device 40 can be hot cut Machines, blades or other such mechanisms are not limited in the present invention.

Please refer to FIG. 4 together. The two pieces of the cut piece are respectively turned to the upper side feeding path T1 via the upper first turning roller 44, and are turned to the lower side by the second turning roll 45 of the lower side. The path T2 is respectively pulled by the first path feeding roller 50 and the second path feeding roller 60 to be respectively transmitted from the upper side conveying path T1 and the lower side conveying path T2 to the upper side swaying roller 71 and the lower side swaying Roller 72. The upper swing roller 71 and the lower swing roller 72 respectively include a pivot (not shown), a folding roller 73 disposed on the pivot, and are disposed on the guiding mechanism 74 and defined along the guiding mechanism 74. a slider 75 that moves up and down the path, and the slider 75 of the upper swing roller 71 and the lower swing roller 72 is positioned by a connecting rod 76 for synchronizing the upper swing roller 71 and the lower swing roller. 72 trips. In the embodiment, the slider 75 is respectively provided with a folding roller 73 on both sides (increasing the weight of the folding roller 73 to disperse the weight of the tablet (mold)), but the present invention does not intend Limiting the number of the turning rollers 73 will be described here. The displacement calculating device 80 is disposed on one side of the guiding mechanism 74 for recording the boundary position of the upper side swing roller 71 and the lower side swing roller 72. The displacement calculating device 80 can be a resistance ruler, an optical scale, a digital ruler, or the like. In a preferred embodiment, the displacement calculation device 80 is a resistor. The resistor includes a housing fixed to the machine, a resistive rail disposed on the housing, and a brush abutting on the side of the swing roller 71 and being displaced by the swing roller 71. Since the resistance ruler has good wear resistance characteristics, and the error range can be controlled within 0.2% to 0.02%, the error caused by the stroke can be reduced in the embodiment.

The second conveying roller 90 is disposed at the other end of the conveying path, and is rotated by the second driving device 91 to pull the web in a stepwise manner to the processing device at the rear end for processing. The second conveying roller 90 is provided with a driven roller 92 on the side for clamping the web from both sides with the second conveying roller 90. The second conveying roller 90 is rotated by the second driving device 91 to control the rotation speed of the web. In the embodiment, the second driving device 91 is preferably a servo motor (Servo Motor). The servo motor conveys the web to the processing device at the rear end by a distance, and is processed by the processing equipment of the rear end.

Since the second conveying roller 90 and the first conveying roller 30 transmit the web at different rotational speeds (the first conveying roller 30 transmits the web in a continuous manner, and the second conveying roller 90 transmits the web in a stepwise manner) The upper and lower swing rollers 71, 72 are swung along the path defined by the guiding mechanism 74 by the tension of the web, whereby the second transport roller 90 and the first transport roller 30 are transported. The travel of the web is synchronized.

Please refer to FIG. 5 for a block diagram of the web tension control system of the present invention. As shown in the figure, the web tension control system 200 of the present invention corresponds to the above-mentioned plastic bag manufacturing machine 100, which is provided. The sheet tension control system 200 controls the tension of the web by the control unit 10 in cooperation with the first conveying roller 30, the first driving device 32, the second conveying roller 90, the second driving device 91, the rocking roller 70, and the displacement calculating device 80. The degree to which the web is stretched is fixed, thereby controlling the degree of stretching of the web for each output to be regular.

The first conveying roller 30 is carried by the first driving device 32 Rotating to continuously pull the web along the conveying path, the second conveying roller 90 is rotated by the second driving device 91 to pull the web in a stepwise manner to the processing device at the rear end for processing, and The conveying path between the first conveying roller 30 and the second conveying roller 90 is provided with a rocking roller 70 which is oscillated along a path by the tension of the web to change the stroke of the web. A displacement calculating device 80 is disposed on one side of the swing roller 70, and the position of the rocking roller 70 is recorded, and the position is transmitted to the control unit 10. Thereby, the control unit 10 can record the position (height) of the swing roller 70 corresponding to the guiding mechanism 74 by the displacement calculating device 80, and compensate or reduce the first driving device 32 based on the position. Speed.

The following is a description of a specific embodiment: the control unit 10 prestores a displacement upper limit value and a displacement lower limit value. The displacement upper limit value corresponds to an upper limit position of the swing roller 70 that the programmer desires to control, and the displacement lower limit value corresponds to a lower limit position of the swing roller 70 that the programmer desires to control. When the machine is in operation, the control unit 10 continuously records the position of the swing roller 70 by the displacement calculating device 80. When the swing roller 70 swings to the upper limit of the displacement, the control unit 10 triggers and transmits an acceleration command. Up to the first driving device 32, increasing the rotational speed of the first driving device 32 to provide compensation, when the rocking roller 70 swings to the lower limit of the displacement, the control unit 10 triggers and transmits a deceleration command to the first driving device. 32. Reducing the rotational speed of the first drive unit 32 provides correction.

The following is a description of another specific embodiment: the control unit 10 prestores a first threshold value and a second threshold value. When the swing roller 70 swings to the first boundary, the control unit 10 borrows Recording, by the displacement calculating device 80, the first boundary position of the rocking roller 70, and calculating an error value between the first boundary position and the first threshold value and converting the first compensation parameter back to the first driving Apparatus 32 to correct the rotational speed of the first drive unit 32. Specifically, if the control unit 10 detects that the height of the first boundary position is insufficient by the displacement calculating device 80, the control unit 10 increases the rotation speed of the first driving device 32 to make up the insufficient portion; When the displacement calculating device 80 detects that the first boundary position height exceeds, the control unit 10 lowers the rotation speed of the first driving device 32 to eliminate the excess portion. When the rocking roll 70 swings to the second boundary, the control unit 10 records the second boundary position of the rocking roll 70 by the displacement calculating device 80, and calculates between the second boundary position and the second critical value. The error value is converted into a second compensation parameter and transmitted back to the first driving device 32 to correct the rotation speed of the first driving device 32. Specifically, if the control unit 10 detects that the second boundary position is insufficient to return to the starting height by the displacement calculating device 80, the control unit 10 adjusts and increases the rotation speed of the first driving device 32 to make up the deficiency. If the control unit 10 detects that the second boundary position is beyond (ie, is lower than) the starting height by the displacement calculating device 80, the control unit 10 adjusts to slow down the first driving device 32. The speed is used to eliminate excess. Accordingly, the first driving device 32 can be continuously adjusted and corrected to control the tension of the web to a certain value, so that the web can be controlled to output under the same conditions every time it is reciprocated.

The following is a description of another specific embodiment: the control unit 10 prestores a first buffer position and a second buffer. The punching position is determined according to the time required for the swing roller 70 to swing from the first buffer position to the second buffer position (determined according to the environmental parameter and the operating speed of the first driving device 32 and the second driving device 91) a predetermined time; and according to the time required for the swing roller 70 to swing from the second buffer position to the first buffer position (depending on the environmental parameters and the operating speed of the first driving device 32 and the second driving device 91), Get a second predefined time. The control unit 10 is calculated when the swing roller 70 starts from the second buffer position. After the first predetermined time, the position of the swing roller 70 is obtained as the first reference by the displacement calculating device 80. The position is calculated, and the error value of the first reference position and the first buffer position is calculated as a first compensation parameter, which is transmitted back to the first driving device 32 to correct the rotation speed of the first driving device 32. When the rocking roller 70 moves to the first buffer position, the control unit 10 is calculated when the rocking roller 70 starts from the first buffer position, and after the second predetermined time, the displacement calculating device 80 Obtaining the position of the swing roller 70 as the second reference position, and calculating the error value of the second reference position and the second buffer position to be converted into a second compensation parameter and transmitting back to the first driving device 32 to correct The rotational speed of the first drive unit 32. Thereby, the rotation speed of the first driving device 32 can be corrected in advance by the time parameter, and the stroke and position of the movement of the rocking roller 70 can be controlled to a fixed value.

Please refer to FIG. 6 together, which is a schematic flow chart of the method for controlling the tension of the web of the present invention, as shown in the figure: First, the sheet tension control system 200 (or the plastic bag manufacturing machine 100) is provided. The web tension control system 200 includes a first conveying roller 30. First driving device 32, second conveying roller 90, second driving device 91, rocking roller 70, displacement calculating device 80. (Step S21)

Before the operation of the web tension control system 200, a displacement upper limit value and a displacement lower limit value are predefined.

The displacement calculation device 80 is activated during operation of the system, and the displacement calculation device 80 records the position of the sway roller 70. (Step S22)

When the swing roller 70 swings to the upper limit of the displacement, an acceleration command is transmitted to the first driving device 32, thereby reducing the amplitude of the rising of the rocking roller 70. (Step S23)

When the rocking roller 70 swings to the lower limit of the displacement, a deceleration command is transmitted to the first driving device 32, thereby reducing the amplitude of the falling of the rocking roller 70. (Step S24)

By the corresponding steps described above, the swing roller 70 is appropriately controlled to swing within a preset range to continuously control the degree of stretching of the web until the machine stops.

Please refer to FIG. 7 together, which is a schematic flow chart of the method for controlling the tension of the web of the present invention. As shown in the drawing, the following is a detailed description of the web tension control method of the present invention. The web tension control method is applied to the above-described plastic bag manufacturing machine 100 and tension control system 200.

First, the web tension control system 200 (or the plastic bag manufacturing machine 100) is provided. The web tension control system 200 includes a first conveying roller 30, a first driving device 32, and a second conveying roller 90. The second driving device 91, the rocking roller 70, and the displacement calculating device 80. (Step S31)

When the system is in operation, the displacement computing device 80 is activated by the The displacement calculating means 80 records the position of the rocking roll 70. When the second conveying roller 90 pulls the web to swing the swing roller 70 to a first boundary, the first boundary position of the rocking roller 70 is recorded (step S32), and the first boundary position is compared with the first critical value. . Calculating an error value of the first boundary position of the displacement calculation device 80 and the first threshold value, and converting the first compensation parameter to the first driving device 32 to correct the rotation speed of the first driving device 32 (step S33) ).

Recording the second boundary position of the swing roller 70 as the swing roller 70 is transported by the first transport roller 30 and swinging back to a second boundary (step S34), and comparing the second boundary position with the second threshold . Calculating an error value of the second boundary position of the displacement calculating device 80 and the second threshold value and converting the second compensation parameter to the first driving device 32 to correct the rotation speed of the first driving device 32 again (step S35).

Finally, the above steps are continued to bring the tension of the web to a regularity to control the degree of stretching of the web until the machine stops.

Please refer to FIG. 8 for a schematic flow chart of another embodiment of the web tension control method of the present invention. As shown in the figure, the following is a detailed description of the web tension control method of the present invention. The web tension control method is applied to the above-described tension control system 200 and plastic bag manufacturing machine 100.

The web tension control system 200 (or the plastic bag manufacturing machine 100) is provided, and the web tension control system 200 includes a first conveying roller 30, a first driving device 32, a second conveying roller 90, and a second Drive device 91, rocking roller 70, position The computing device 80 is shifted. (Step S41)

The displacement calculation device 80 is activated during operation of the system, and the displacement calculation device 80 records the position of the sway roller 70.

Before the operation of the web tension control system 200, a first buffer position and a second buffer position are predefined (step S42), and according to the time required for the swing roller 70 to swing from the first buffer position to the second buffer position ( Obtaining a first predefined time according to the environmental parameter and the operating speed of the first driving device 32 and the second driving device 91; and according to the swinging roller 70, the second buffering position is required to swing to the first buffering position. The time (based on the environmental parameters and the operating speed of the first drive unit 32 and the second drive unit 91) is used to obtain a second predefined time (step S43).

After the swing roller 70 has passed the first predetermined time from the second buffer position, the position of the swing roller 70 is taken as the first reference position. (Step S44)

The error value of the first reference position and the first buffer position obtained by the displacement calculating device 80 is calculated and converted into a first compensation parameter and transmitted back to the first driving device 32 to correct the rotation speed of the first driving device 32. (Step S45)

After the swing roller 70 has passed the second predetermined time from the first buffer position, the position of the swing roller 70 is obtained as the second reference position. (Step S46)

Calculating an error value of the second reference position and the second buffer position obtained by the displacement calculating device 80 and converting the second compensation parameter back to the first driving The device 32 is to correct the rotational speed of the first drive unit 32 again. (Step S47)

Finally, the above steps are continued to bring the tension of the web to a regularity to control the degree of stretching of the web until the machine stops.

The method of the present invention can also be implemented as a computer program product or a computer readable recording medium. Specifically, the method can be written into a computer readable recording medium such as a magnetic disk, a CD, a flash drive, Disk hard disk, solid state hard disk, dynamic random access memory, static random access memory, read-only memory, flash memory, and the like.

In summary, the present invention controls the stroke displacement of the rocking roller by the displacement stroke device, and effectively controls the length of each material output, so that the stretch of the web is maintained at the same tension each time. The invention controls the height of each stroke of the rocking roller by setting the first critical value and the second critical value, and effectively controls the length of each output of the web, so that the stretching of the web is maintained at the same tension each time.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

200‧‧‧Material tension control system

10‧‧‧Control unit

30‧‧‧First transfer roller

32‧‧‧First drive

70‧‧‧Wave Roller

80‧‧‧displacement computing device

90‧‧‧Second transfer roller

91‧‧‧Second drive

Claims (12)

A web tension control system for controlling the tension of a web, the control system comprising one or a plurality of first conveying rollers and a second conveying roller, the first conveying roller being rotated by the first driving device for continuous traction The web is conveyed along a conveying path, and the second conveying roller is disposed at the other end of the conveying path, and the second driving device drives the rotation to pull the web in a stepwise manner to a processing device for processing. The conveying path between the first conveying roller and the second conveying roller is provided with a oscillating roller which is oscillated along a path by the tension of the web to change the stroke of the web, and the swaying roller side A displacement calculating device is provided, the position information of the rocking roller is recorded, and the position information is transmitted to the control unit, and the control unit compensates or reduces the rotation speed of the first driving device based on the position information. The web tension control system of claim 1, wherein the control unit prestores a displacement upper limit value and a displacement lower limit value, and the control unit continuously records the swing by the displacement calculation device. Positioning the roller, and transmitting an acceleration command to the first driving device when the rocking roller swings to the upper limit of the displacement, and transmitting a deceleration command to the first when the rocking roller swings to the lower limit of the displacement Drive unit. The web tension control system of claim 1, wherein the control unit prestores a first threshold value and a second threshold value, the control unit is when the swing roller swings to the first boundary Recording, by the displacement calculating device, a first boundary position of the rocking roller, and calculating an error value between the first boundary position and the first threshold value to be converted into a first compensation parameter and transmitting the first compensation parameter to the first driving device To correct the rotation speed of the first driving device, the control unit records the second boundary position of the rocking roller by the displacement calculating device when the rocking roller swings to the second boundary, and calculates the second boundary position and the second The error value between the threshold values is converted into a second compensation parameter and transmitted back to the first driving device to correct the rotation speed of the first driving device again. The web tension control system of claim 1, wherein the control unit prestores a first buffer position and a second buffer position, wherein the control unit is driven by the second buffer position. After the first predefined time, the position of the rocking roller is obtained as a first reference position by the displacement calculating device, and the error value of the first reference position and the first buffer position is calculated as a first compensation parameter. Returning to the first driving device to correct the rotation speed of the first driving device, the control unit acquires the rocking roller by the displacement calculating device after the swinging roller starts from the first buffering position and after a second predefined time The position of the second driving position is calculated as a second reference position, and the error value of the second reference position and the second buffer position is calculated as a second compensation parameter, which is transmitted back to the first driving device to correct the first driving device again. Rotating speed. The sheet tension control system according to any one of claims 1 to 4, wherein the displacement calculating device is a resistor, the resistor includes a housing fixed to the machine, and a housing a resistor rail disposed on the housing, and a slider abutting on the side of the rocking roller and being displaced by the rocking roller. The web tension control system of claim 1, wherein the rocking roll system comprises a pivot shaft, and is pivoted on the pivot shaft and driven by the web a rotating roller and a guiding mechanism for the pivot to swing along the path. The web tension control system of claim 1, wherein the second driving device is a servo motor. A tablet tension control method for a web tension control system according to claim 1, wherein the method comprises: predefining a displacement upper limit value and a displacement lower limit value; and continuously recording by the displacement calculation device Positioning the rocking roller; transmitting an acceleration command to the first driving device when the rocking roller swings to the upper limit of the displacement; transmitting a deceleration command to the first driving when the rocking roller swings to the lower limit of the displacement Device. A tablet tension control method for a web tension control system according to claim 1, wherein the method comprises: predefining a first threshold value and a second threshold value; and swinging the rocking roller to a first Recording a first boundary position of the rocking roll at the boundary; calculating an error value of the first boundary position and the first threshold value and converting the first compensation parameter back to the first driving device to correct the first driving device Rotating speed; recording a second boundary position of the rocking roller when the swinging roller swings back to a second boundary; calculating an error value of the second boundary position and the second critical value and converting it into a first The second compensation parameter is transmitted back to the first driving device to correct the rotational speed of the first driving device. A tablet tension control method for a web tension control system according to claim 1, wherein the method comprises: predefining a first buffer position and a second buffer position; wherein the swing roller is the second After the first pre-defined time of the buffer position, the position of the rocking roller is obtained as a first reference position; the error value of the first reference position and the first buffer position obtained by the displacement calculating device is calculated and converted into one Returning the first compensation parameter to the first driving device to correct the rotation speed of the first driving device; after the second predetermined time elapses from the first buffering position, the position of the rocking roller is obtained as a second reference position; calculating an error value of the second reference position and the second buffer position obtained by the displacement calculating device, and converting the second compensation parameter to a second driving parameter, and transmitting the error to the first driving device to correct the first driving device again Speed. A computer-readable recording medium on which a program is recorded. When the computing host loads the program and executes it, the method of any one of claims 8 to 10 can be completed. A computer program product, when the computer program product is loaded into a computer for execution, the method of any one of claims 8 to 10 can be completed.