JPH0295657A - Control method for tape take-up machine - Google Patents

Abstract

PURPOSE:To take up the target quantity of a tape at the time of the speed of a speed basic pattern becoming '0' by checking the difference between the running quantity from the starting time of the take-up and the basic running quantity at the time of passing a checkpoint so as to control the tape running speed. CONSTITUTION:The cumulative rotating speed of a measurement roller at each checkpoint enumerated from the starting time of take-up by means of a counter 11 is compared with the basic running value at the checkpoint memorized in an ROM 14 at a CPU 13, and the enumerated speed correction quantity is inputted into a differential amplifier 18 through D-A converter 16. The tape running speed at the checkpoint is compared with the speed value of the basic pattern inputted into a differential amplifier 12 from the ROM 14 through the CPU 13 and a D-A converter 15, the speed difference corresponding to the comparison is inputted into the differential amplifier 18, the driving of a feed motor 8 is controlled by the speed control signal added with the speed correction quantity from the D-A converter 16 such that the actual tape running speed becomes approximately '0' at the terminating time of the take-up T3.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for controlling a tape winding machine when winding a tape onto a take-up reel while controlling the running speed of the tape sent out from a supply reel. In particular, the present invention relates to a control method for controlling the running speed of a tape based on a predetermined speed reference pattern.

(Prior Art) Conventionally, in a tape winding machine used for slitting or rewinding a long tape such as a magnetic tape, the tension of the winding reel is controlled in order to wind the tape accurately. It is known that the speed of the supply reel is controlled based on a predetermined speed reference pattern.

This speed standard pattern is generally shaped like a trapezoid having an increasing speed region, a constant speed region, and a decelerating region, and the tape speed is controlled to follow this pattern, but the actual tape running speed is Since there is a certain degree of delay with respect to the reference speed based on the above pattern, even when winding progresses and a predetermined winding end in the above pattern is reached and a predetermined amount of tape has been wound, the tape will still maintain a certain speed. It means you are running. As a result, the supply motor suddenly stops, causing damage to the tape.

Therefore, conventionally, a terminal constant speed area where the tape runs at an extremely low speed is provided for a certain period of time at the final part of the deceleration area of the speed reference pattern, and as described above, when a predetermined amount of tape has been wound, the supply motor The tape is designed to minimize damage if it suddenly stops.

(Problem to be Solved by the Invention) However, if the speed reference pattern is provided with the terminal constant speed region as described above, the tape winding speed during this period is small, so it takes a long time to wind the tape, which makes tape manufacturing difficult. Unable to improve efficiency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce damage to the tape at the end of winding when the tape is run from a supply reel to a take-up reel based on a predetermined speed reference pattern. It is an object of the present invention to provide a control method for a tape winding machine that can reduce winding time.

(Means for Solving the Problems) A control method for a tape winding machine of the present invention provides a checkpoint for checking the amount of tape travel in the deceleration region of the speed reference pattern, and detects the amount of tape winding detected at this checkpoint. The tape running amount after the start is compared with the tape standard running amount at this checkpoint based on the above reference pattern, and based on the comparison result, the tape is moved to the take-up reel by a predetermined target amount at the end of winding of the above pattern. It is characterized by controlling the running speed of the tape so that it is wound up.

(Function) According to the above configuration, when the checkpoint set in the deceleration area of the speed reference pattern passes, the amount of difference between the travel amount from the start of winding and the base travel amount is checked, and the situation is checked. The tape running speed is controlled according to the speed reference pattern, so that a target amount of tape is wound up at the time when the speed of the speed reference pattern becomes zero. That is, in the above-mentioned check, if the actual running amount is smaller than the reference running amount, the tape running speed is increased for the pattern, and if the opposite is true, the tape running speed is slowed for the pattern. The deceleration region is located in the final period of the speed reference pattern, and by performing such speed control during this period, the slope of the speed reference pattern in the deceleration region can be changed constant or continuously. It is possible to avoid a situation where the tape running speed is still high when the target amount of tape is wound. Therefore, the terminal constant speed region provided at the end of the deceleration region of the speed reference pattern in the prior art becomes unnecessary, and thereby the tape winding time can be shortened.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a magnetic tape winder using a method according to an embodiment of the present invention. In this magnetic tape winder, a magnetic tape 2 pulled out from a supply reel 1 passes through a measuring roller 3 and a dancer roller 4, and is then wound onto a take-up reel 5. The measuring roller 3 is in contact with the magnetic tape 2, rotates in synchronization with the running of the magnetic tape 2, and is used to detect the feed amount and feed speed of the magnetic tape 2. The dancer roller 4 is rotatably supported by a dancer arm (not shown), and the magnetic tape 2 is guided by a pair of guide rolls 6.7.
It is urged by an arm spring (not shown) in the direction of pulling out. Further, the supply reel 1 and the take-up reel 5 are rotationally driven by a supply motor 8 and a take-up motor 9, respectively.

Further, the rotation signal output from the measuring roller 3 is input to the F-V converter 10 and the counter 11. The F-V converter 10 converts the frequency of the rotation signal as input tape running speed information into a voltage, and converts this voltage into a voltage.
Send to 2. On the other hand, the counter 11 counts the rotations of the dancer roller 4 based on the input rotation signal and sends to the CPU 13 the cumulative number of rotations from the start of tape winding. Further, the ROM 14 stores data such as a predetermined speed reference pattern, reference traveling distance at each checkpoint, reference tension value, etc., and these data are stored in each D-A converter 15.
．． 18.17, it is converted into a predetermined analog quantity and sent to each differential amplifier 12.18.19. Further, the differential amplifier 18 sends a speed control signal to the servo amplifier 20, based on which the supply motor 8 is rotationally driven, and the differential amplifier 19 sends a tension control signal to the servo amplifier 21, which rotates the supply motor 8. Based on this, the winding motor 9 is rotationally driven.

Next, speed control in the winding machine described above will be explained. The above-mentioned speed reference pattern has the shape shown in FIG. 2, for example, and consists of a speed increase area a1, a constant speed area, and a deceleration area C. The speed increase region a is the region from the start of winding t0 to the start of constant speed running t1, and the deceleration region C is the region from the start of deceleration t2 to the end of winding t3. In this deceleration area, check points (corresponding to O marks in FIG. 2) are provided at equal intervals, and at each check point, the winding amount calculated by the counter 11 based on the rotation of the measuring roller 3 is The cumulative number of rotations from the start is input to the CPU 13. On the other hand, the CPU 13 compares the reference traveling distance value at the checkpoint stored in the ROM 14 (corresponding to the area surrounded by the speed reference pattern of the checkpoint special and the time axis t), and based on the comparison result, The calculated speed correction amount is input to the differential amplifier 18 via the DA converter 1G. On the other hand, the tape running speed at each checkpoint, which is input from the measuring roller 3 to the differential amplifier 12 via the F-V converter 10, is stored in the ROM 14 and stored in the CPU 1.
3 and the speed value of the speed reference pattern inputted to the differential amplifier 12 via the DA converter 15, and a differential speed corresponding to the difference is inputted to the differential amplifier 18. (Adder) 18 adds this differential speed to the aforementioned speed correction amount from the DA converter 16 to form a speed control signal, whereby the supply motor 8 is appropriately driven and controlled. Such speed control is performed at each checkpoint, and the tape speed is corrected each time, so that the actual tape running speed is controlled to be approximately 0 at the end of winding t3. The speed correction amount at each checkpoint is held by the CPU 13 or a latch (not shown) so that it continues to be input to the differential amplifier 18 until the speed correction amount at the next checkpoint is calculated. Note that, for example, five or six check points are provided every 0.818.

Next, the third output subroutine program for the above correction amount is executed.
This will be explained in more detail with reference to the flowchart shown in the figure. The CPU 13 constantly reads the time signal sent from the timer, and determines whether the time corresponds to a checkpoint (A1). If it is not the checkpoint time, the routine returns to the normal routine, but if it is determined that it is the checkpoint time, the value from the counter 11 is read,
The cumulative tape running amount is calculated based on this counter value (A2). Next, the calculated cumulative tape running amount and ROM1
The difference between the tape reference running amounts at the time of the checkpoint stored in step 4 is calculated, and the range of this difference is determined (A3).

In other words, if tape standard running amount - cumulative tape running amount - 8, is S greater than a predetermined value n, S smaller than a predetermined value - n, or ISI less than or equal to a predetermined value n? is judged.

If S is larger than n, the correction amount is +1 bit (A4
), if S is smaller than 10, the correction amount is set to 11 bits (A5), and if IsI is less than or equal to n, the correction amount is 0.
(A6). After the correction amount is determined in this way, the routine returns to the normal routine.

Note that the above-mentioned predetermined value n is set, for example, to the amount of error between the cumulative tape running amount and the tape reference running amount. Further, 1 bit shown in the above correction amount represents the minimum bit (LSb) of the DA converter 16.

In addition, the correction amount can be set to a value of 2 bits or more or 12 bits or less (however, only integer values can be taken) depending on the value of S, and in this way, the cumulative tape running amount can be adjusted. It becomes possible to rapidly approach the standard tape running amount.

Further, the above-mentioned relationship between S, which is the tape reference running amount minus the cumulative tape running amount, and the speed correction amount ΔV is expressed as a linear relational expression: Δv--aS (a is a constant) (1). Also, if the correction period is T, the total amount ΔV corrected during T
becomes ΔV-T-Δv-(2). Furthermore, the condition that no divergence occurs when correction is applied is -S<S+T·Δv<S (3).

Therefore, from the above formulas (1) to (3), the above a is 0 × a ...(4) It is necessary to set it within a certain range.

The above are the conditions for the correction amount calculated linearly, but in reality the correction amount is set digitally, so as shown in Figure 4, a straight line with a slope of 1a determined by the formula (4) above. are arranged discretely on the top.

Note that the tape winding device to which the method of the embodiment of the present invention is applied is not limited to that of the above embodiment, but can also be applied to, for example, a tape slitter device. Further, the tape to be wound is not limited to the above-mentioned magnetic tape, but tapes made of various materials such as abrasive tape, paper, and plastic can be used.

In the above embodiment, the speed of the supply motor is controlled, but it is also possible to perform similar speed control of the take-up motor that drives the take-up reel.

(Effects of the Invention) As explained above, according to the tape winding machine control method of the present invention, the speed of the speed reference pattern becomes 0 even without providing a terminal constant speed region in the deceleration region of the speed reference pattern. Since the actual tape travel amount can be made approximately equal to the target winding amount at the time, it is possible to shorten the tape winding time without increasing tape damage at the end of winding, and thus to improve the efficiency of tape manufacturing. Become.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a magnetic tape winder using the embodiment method according to the present invention, and FIG. 2 is a graph showing an example of a speed reference pattern used in controlling the winder shown in FIG. , FIG. 3 is a flowchart showing a correction amount output program used in controlling the winding machine shown in FIG. 1, and FIG. 4 is a graph showing the range of correction amounts used in controlling the winding machine shown in FIG. 1. It is. 1... Supply reel 2... Magnetic tape 3...
・Measurement roller 4...Dancer roller 5...
Take-up reel 8... Supply motor 9... Take-up motor 11... Counter 12.18.19...
・Differential amplifier ■3...CPU 14...ROM Figure 1 Figure B to Figure 4 Figure 6゜Column 7 of "Detailed Description of the Invention" of the specification to be amended, Contents of the amendment 1) Correct the display of ``Dancer Roller 4'' in the 1° incident on page 7 of the specification to ``Measuring Roller 3''. Patent Application No. 247.221 of 1988 2゜Name of invention Control method for tape winder 3゜Relationship with the case of the person making the amendment

Claims (1)

[Claims] When winding a predetermined amount of tape fed from a supply reel onto a take-up reel, there is a speed increase region for a predetermined period starting from the start of winding, and a deceleration region for a predetermined period until the end of winding. In a control method for a tape winder, the tape winding machine controls the tape running speed based on a predetermined speed reference pattern having a region, in which at least one checkpoint is provided in the deceleration region of the speed reference pattern, and when this checkpoint passes, The amount of tape travel after the start of winding is detected, the detected value is compared with the standard amount of tape travel based on the speed reference pattern, and based on the comparison result, the tape reaches the predetermined amount at the end of winding of the pattern. A method for controlling a tape winding machine, comprising: controlling a running speed of the tape so that the tape is wound onto the take-up reel.