JPH0682597B2 - Condenser winding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a condenser winding machine, and more particularly, to always optimally control the tension of a wound object such as an electrode foil and a dielectric film that are wound in layers. The present invention relates to a capacitor winder capable of preventing wrinkles and fluctuations in capacity characteristics.

[Prior Art] Generally, in a capacitor winder for manufacturing a wound film capacitor, an aluminum sheet as an electrode foil and a plastic film as a dielectric film are wound so as to be stacked with a constant tension, and laminated winding is performed. By this tension, it is possible to prevent wrinkles of the aluminum sheet and the like due to the tension, and to obtain a capacitor having stable capacitance characteristics. In addition, the DC servomotor that drives this condenser winder is driven and controlled in the forward and reverse directions by receiving the driving power that flows through the power transistor installed on the heat sink, and while controlling the tension, the aluminum sheet and the plastic film are driven. To send. Further, the speed of this DC servo motor is controlled by the pulses of different duty output from the control circuit of the forward / reverse drive circuit.

[Problems to be Solved by the Invention] However, in such a DC servo motor, when the power supply is switched from the ON state to the OFF state, a high back electromotive force is instantaneously generated in the DC servo motor, and the back electromotive force is generated. In addition to lowering the rotation control speed and efficiency, it also flows into the power transistor to accelerate the heat generation of the power transistor and eventually destroys it.

As a result, in such a capacitor winder, the winding speed of the electrode foil and the derivative film wound from the roll becomes unstable, and the tension on the electrode foil and the dielectric film becomes indefinite. Moreover, wrinkles may occur in the dielectric film and the capacitance characteristics of the capacitor product may become unstable. This problem tends to be particularly remarkable when the electrode foil or the dielectric film is extremely thin.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to wind the electrode foil and the dielectric film to be wound in a laminated manner with a constant tension without generating wrinkles. An object of the present invention is to realize a capacitor winding machine that can obtain a wound type capacitor with stable characteristics.

[Means for Solving Problems] In order to achieve the above object, a capacitor winding machine according to the present invention includes a plurality of rolls around which a wound material such as an electrode foil or a dielectric film is wound. A winding core that rotates in a fixed direction to laminate and wind the wound object of each roll, a DC servo motor connected to at least one rotation shaft of the plurality of rolls, and this DC servo motor were connected. A tension detection mechanism for detecting a tension in the course of unwinding of a wound object which is unwound from a roll, and a forward / reverse drive for controlling the rotation direction and the rotation speed of the DC servomotor based on a forward / reverse drive signal from the tension detection mechanism. In the capacitor winder including a circuit, the tension detection mechanism includes a roller that rotatably contacts with a part of the wound object that is being wound, and the roller. A swingable arm to be attached, and a biasing means for biasing the arm in a direction to apply a tension to the wound object in contact with the roller,
And a tension sensor that detects a position change due to the swing of the arm and outputs the position change as a forward / reverse drive signal for the DC servo motor, wherein the forward / reverse drive circuit outputs the forward / reverse rotation output from the tension sensor. Drive signal,
A pulse width modulation circuit for converting into a positive and negative pulse width modulation signal according to the rotation direction and the rotation speed, and each 1 for supplying positive or negative electric power to the DC servo motor according to the positive or negative pulse width modulation signal. Power transistor, a pair of power regeneration thyristors connected in anti-parallel to the DC servo motor, and a trigger signal in order to forward the counter electromotive force generated when the power supply to the DC servo motor is cut off in the forward direction. A thyristor coupler is provided for outputting, and a timing circuit for turning on any one of the power regeneration thyristors is provided.

[Operation] In the capacitor winder of the present invention, since the tension of the electrode foil or the electric conductor film is always maintained in the optimum state, it is possible to prevent the generation of wrinkles and the defective capacity characteristics due to the wrinkles.

Further, since at least two power regeneration thyristors forming the forward / reverse rotation driving circuit of the DC servo motor in the capacitor winder of the present invention, only one of them is turned on according to the polarity of the power supplied to the DC servo motor. The back electromotive force generated in the DC servo motor when the drive power is cut off can be forwarded through the turned-on thyristor, and the thyristor is turned on by the timing circuit only when the drive power is cut off. Act on.

In other words, the thyristor has a characteristic that it is turned off until a trigger is applied to its gate, and it turns off when the forward voltage becomes zero even if a trigger is applied once and turned on. A back electromotive force is generated in the DC servo motor immediately after the servo motor power is turned off, and when a forward voltage is applied to the thyristor, the thyristor turns on and the back electromotive force weakens and the thyristor stays on. The thyristor turns off when the current falls below
By repeating this, electric power is regenerated.

Therefore, the back electromotive force does not flow into the power transistor of the DC servo motor drive circuit and does not generate heat. Further, the inverse power can be used as regenerative power. Therefore, the operating speed of the DC servomotor that rotates the shaft of the roll wound with the electrode foil or the dielectric film is not adversely affected by the back electromotive force, and the tension of at least one of the electrode foil and the dielectric film is always Since it is kept constant, it is possible to prevent the occurrence of wrinkles and the variation in the capacitance characteristics of the capacitor product due to the wrinkles.

[Embodiment 1] FIG. 1 is a schematic explanatory view of a capacitor winder which is an embodiment of the present invention, and FIG. 2 is a block diagram of a forward / reverse drive circuit of a DC servo motor incorporated in the capacitor winder, FIG. 3 is a waveform diagram showing an output signal in each section.

In the capacitor winding machine shown in FIG. 1, reference numeral 1 is an electrode foil made of foil such as aluminum or tin, and 2
Is a dielectric film made of a plastic such as polyester, polypropylene, polyethylene or the like for laminating and winding with the electrode foil to form a film winding type capacitor.

Since the electrode foil 1 and the dielectric film 2 are alternately laminated by two sheets, a total of four sheets are laminated and wound on each other. Therefore, the electrode foil winding mechanism A and the dielectric winding mechanism B are paired up and down, respectively. It is provided as a pair. However, since the electrode foil winding mechanism A and the dielectric winding mechanism B need to alternately wind the electrode foil 1 and the dielectric film 2 one by one, the lower pair and the upper pair are left and right. Although they are arranged in the opposite manner, since the functions are substantially the same, the corresponding parts of the respective winding mechanisms A and B will be described with the same reference numerals and the description will be given. The description of each one (the lower side of FIG. 1) is replaced with the other description.

The electrode foil 1 is wound on a roll 3, and the dielectric film 2 is wound on a roll 4. The electrode foil 1 and the dielectric film 2 are paid out from the rolls 3 and 4 by the shafts 5 and 6 of the rolls.
DC servomotors (DC servomotors) 7 and 8 which are respectively connected to. These DC servomotors 7 and 8 are driven via forward and reverse drive circuits 9 and 10, respectively.

Since the electrode foil 1 and the dielectric film 2 respectively fed from the rolls 3 and 4 are alternately laminated and wound, a pair of upper and lower rollers 11 and 12 and a winding core 13 for sandwiching them are provided.

On the other hand, on the way from the rolls 3 and 4 to the rollers 11 and 12, the tensions of the electrode foil 1 and the dielectric film 2 are respectively detected and adjusted to prevent wrinkles and fluctuations in capacitance characteristics. Tension detection mechanisms 14 and 14a are provided. Since the tension detecting mechanisms 14 and 14a have substantially the same structure, only one of them, 14 here, will be described, and the other of them will be denoted by the same reference numeral with a suffix a and redundant description will be omitted. That is, the tension detecting mechanism 14 is for detecting the tension of the electrode foil 1 fed from the roll 3 and adjusting the tension to a constant value, and includes an arm 16 which can be swung around the swing shaft 15 as indicated by a dashed arrow, A spring 17 for pulling the arm 16 in a tension applying direction, that is, a clockwise direction in FIG. 1, and a swing shaft 15 are provided, and the tension of the electrode foil 1 is detected from the swing position of the swing shaft 15 and the arm 16. Then, the tension sensor 18 which is applied to the forward or reverse rotation drive circuit 9 of the DC servo motor 7, for example a potentiometer, and the tip of the arm 16 are rotatably attached so that the electrode foil 1 can be easily fed out. Electrode foil 1
And a roller 19 that partially contacts one side surface to apply and adjust tension to the electrode foil 1. On the other hand, the tension detecting mechanism 14a includes a swing shaft 15a, an arm 16a, a spring 17a, a tension sensor 18a, and a roller 19a, and is substantially the same as the tension detecting mechanism 14 except that the swing direction of the arm 16a is different. The same applies to the above, whereby the tension of the electric film 2 fed from the roll 4 can be adjusted to be constant.

Next, the forward / reverse drive circuit 9 or 10 for driving the DC servomotor 7 or 8 will be described.
The DC servo motors 7 and 8 are substantially the same except that the forward and reverse directions are reversed for each pair, so only one circuit 9 will be described.

That is, FIG. 2 is a block diagram of the forward / reverse drive circuit 9 of the DC servo motor 7, and FIG. 3 is a signal waveform diagram of each part thereof. In this forward / reverse drive circuit 9, 21 is an input terminal for a forward / reverse drive signal (indicated by A in FIG. 3) that randomly changes, 22 is a pulse width modulation circuit, 23 is a motor drive circuit, and 24
Is a timing circuit for thyristor control. The pulse width modulation circuit 22 includes three voltage comparators 25, 26, 27 and resistors 28, 29,
30, 31 and an oscillator circuit 32 are connected as shown in the figure. The oscillator circuit 32 is composed of a programmable unijunction transistor, a timer IC, etc., and generates a triangular wave B and a square wave C as shown in FIG. Output. Further, the motor drive circuit 23 includes two power transistors 33 and 34 connected to the positive and negative drive power input terminals, reverse current prevention diodes 35 and 36, and anti-parallel power regeneration for the DC servo motor 7 in parallel. It consists of thyristors 38 and 39. Among these power regeneration thyristors, 38 are for forward rotation and 39 are for reverse rotation. Further, the timing circuit 24 includes two NOR gates 40 and 41 that form a flip-flop circuit, inverters 42, 43 and 44, and two input negation ANDs as a matching theory.
It comprises gates 45 and 46 and photothyristor couplers 47 and 48 connected to the inverters 42 and 43, respectively, and acting as a gate circuit for triggering the thyristors 38 and 39.

Next, the operation of this embodiment will be specifically described.

First, the DC servomotors 7 and 8 are driven counterclockwise or clockwise, respectively, to feed the electrode foil 1 and the dielectric film 2 from the rolls 3 and 4, respectively. By rotating the winding core 13, the winding core is laminated and wound between the pair of rollers 11 and 12 to form a wound capacitor.

At this time, the electrode foil 1 and the dielectric film 2 fed from the rolls 3 and 4 come into contact with the rollers 19 and 19a of the tension detecting mechanisms 14 and 14a on the way to the rolls 11 and 12, and the rollers 19 and 19a rotate. As it goes along, they are paid out in the directions of the solid arrows.
Therefore, in this feeding operation, if the feeding speed of each of the rolls 3 and 4 and the winding speed of the winding core 13 are not optimally related to each other, the tension between the electrode foil 1 and the dielectric film 2 changes, and Alternatively, slack or excessive tension is generated in both of them, and wrinkles or the like are generated in the electrode foil 1 and the dielectric film 2. As a result, the capacitance characteristic of the spirally wound capacitor becomes unstable, resulting in a problem such as characteristic failure.

Therefore, in the present embodiment, the change in tension between the electrode foil 1 and the dielectric film 2 is recognized as a change in the swing position of the arm 16 or 16a of the tension adjusting mechanism 14 or 14a, and based on this, the DC servomotor 7 or 8 is detected. The normal speed, the reverse speed, or the optimal control of the rotation speed keeps the feeding speed of the electrode foil 1 and the dielectric film 2 from the rolls 3 and 4 always in an optimum relationship with the winding speed of the winding core 13. To control it.

That is, for example, a case where the winding speed of the winding core 13 is higher than the feeding speed of the electrode foil 1 from the roll 3 will be described. In this case, the winding of the electrode foil 1 causes the arm 16 to pull the spring 17. It swings upward in FIG. 1 against the force. The swing position of the arm 16 is detected by the tension sensor 18 on the swing shaft 15, and the detection signal is input to the forward / reverse drive circuit 9 as the forward / reverse drive signal A (FIG. 3). For example, assuming that the case where the roll 3 is rotated in the feeding direction of the electrode foil 1 is normal rotation, in the above case, the DC servomotor 7 needs to be rotated in the electrode foil feeding direction, that is, the forward rotation direction. Therefore, in this case, the forward / reverse drive signal A is applied from the tension sensor 18 to the forward / reverse drive circuit 9 as the normal drive signal.

On the contrary, when the feeding speed of the roll 3 is faster than the winding speed of the winding core 13, the electrode foil 1 is in a slackening direction, and contrary to the above, the arm 16 swings clockwise in FIG. It is necessary to slow down or reverse the rotation of the roll 3 to increase the tension of the electrode foil 1. Therefore, in this case, the normal / reverse rotation drive signal A is applied to the normal / reverse rotation drive circuit 9 as a reverse rotation signal (or a normal rotation speed deceleration signal).

Here, the operation of the forward / reverse rotation drive circuit 9 will be described. For example, the input terminal 21 has a third terminal that changes from positive to negative.
When the forward / reverse rotation signal A as shown in the figure is input, the signal A is level-adjusted and input to the voltage comparators 26 and 27. On the other hand, the oscillation circuit 32 outputs the sampling triangular wave B shown in FIG. 3, and this is input to the voltage comparators 26 and 27. Therefore, these voltage comparators 26 and 27 compare the forward / reverse drive signal A and the triangular wave B and output drive signals D and E, which are shown in FIG.

On the other hand, on receipt of either of the drive signals D and E, the two power transistors 33 and 34 are on / off controlled, respectively, and the motor drive power F shown in FIG.
Is obtained, and this is input to the DC servo motor 7. That is, the DC servomotor 7 receives the positive or negative motor drive power F and rotates in the normal or reverse direction.

At this time, the oscillator circuit 32 outputs the triggering square wave C shown in FIG. 3, and the flip-flop circuit outputs the output G shown in FIG. 3 according to the square wave C and the normal drive signal D.
The output G is passed through the AND gates 45 and 46 and the inverters 42, 43 and 44 to be a forward rotation trigger signal H and a reverse rotation trigger signal I, and these signals H and I are further passed through photothyristor couplers 47 and 48. , Each thyristor 38,
Input to each gate of 39.

Therefore, when the drive power supply is suddenly turned off during the rotation of the DC servo motor 7, a counter electromotive force is generated in the winding of the DC servo motor 7, but the counter electromotive force is generated in the forward direction. Since one of the forward rotation or reverse rotation thyristors 38 or 39 placed in the thyristor is turned on, the counter electromotive force flows out through the turned-on thyristors 38 or 39 and does not flow back to the power transistor 33 or 34. . This weakening of the back electromotive force causes it to fall below the on-holding current of its thyristor 38 or 39,
38 or 39 turns off. The regenerative currents J and K of the thyristors 38 and 39 at this time are as shown in FIG. in this way,
By preventing the back electromotive force from flowing into the power transistors 33 and 34, the temperature rise of the power transistors 33 and 34 can be suppressed, and the above thyristors 38 and 39 can be suppressed.
Since the back electromotive force is regenerated by the DC servo motor 7,
Will rotate smoothly.

Further, since the photothyristor couplers 47 and 48 are used as the gate circuits for triggering the power regeneration thyristors 38 and 39, the thyristors 38 and 39 can be effectively triggered, and the transistors and photocouplers are triggered. It is possible to prevent a problem such as destruction of the element due to a reverse voltage as in the case of using it as a gate circuit for use.

As a result, the DC servomotor 7 is stably driven in the forward or reverse direction according to the tension state of the electrode foil 1 detected by the tension sensor 18 of the tension detecting mechanism 14 as described above, and the electrode foil 1 is You can always get out with the optimum tension.

On the other hand, the DC servomotor 8 for feeding out the dielectric film 2 can also be driven in the forward and reverse directions in substantially the same manner as described above, and the dielectric film 2 can always be fed out at an optimum tension.

As a result, it is possible to stably and reliably obtain a good wound-type capacitor without wrinkles or defective capacity characteristics.

[Embodiment 2] FIG. 4 is a schematic explanatory view showing a capacitor winder which is another embodiment of the present invention.

In the second embodiment, the DC servo motor, its forward / reverse drive circuit, and the tension sensor are provided only in the electrode foil winding mechanism A, and the dielectric film winding mechanism B is not provided with them. In this case, the dielectric film 2
Is fed by the rotation of the winding core 13. In this structure, the electrode foil 1 is generally thinner than the dielectric film 2 and is more likely to be wrinkled. Therefore, by applying it in such a case, a desired effect can be obtained.

However, when the thickness of only the dielectric film 2 becomes extremely thin, the DC servomotor or the like may be provided only in the dielectric film winding mechanism, and the present invention includes such a case. It is a waste.

The present invention is not limited to the above embodiment,
Various other modifications are possible.

For example, the present invention can be applied to the case where a protective film is wound between the electrode foil and the dielectric film.

In addition to directly connecting the rotating shaft of the roll and the DC servo motor, they may be indirectly connected via a belt or the like.

[Advantages of the Invention] According to the present invention, the DC servomotor can be driven in the forward and reverse directions to always maintain the tension of the wound object such as the electrode foil and the dielectric film in an optimum state. It is possible to prevent the generation of wrinkles and the like due to the fluctuation of the tension, and to obtain a wound capacitor with stable capacitance characteristics.

Further, in the forward / reverse drive circuit of the DC servo motor in the capacitor winder of the present invention, one pair of power regeneration thyristors each connected in antiparallel to the DC servo motor are selected when the power supply to the DC servo motor is cut off. By turning on automatically, the heat generated by the back electromotive force of the power transistor can be effectively prevented, and the back electromotive force can be used as regenerative power, so the rotation of this DC servomotor can be controlled in a stable and smooth forward / reverse direction. Further, it is possible to obtain the effect that the speed can be controlled.

Further, since the trigger signal to the power regeneration thyristor is output via the photothyristor coupler, the trigger can be effectively performed, and the breakdown of the element due to the reverse voltage can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a capacitor winder which is an embodiment of the present invention, FIG. 2 is a block diagram of a forward / reverse drive circuit of a DC servo motor used therein, and FIG. 3 is a block diagram of each part of this block diagram. FIG. 4 is a signal waveform diagram, and FIG. 4 is a schematic explanatory view of a capacitor winding machine according to another embodiment of the present invention. A: electrode foil winding mechanism, B: dielectric film winding mechanism, 1 ... electrode foil, 2 ... dielectric film, 3,4 ... roll, 5,6 ... rotating shaft, 7,8 ...... Direct current (DC) servo motor, 9,10 …… Forward / reverse drive circuit, 11,12 …… Roller, 13 …… Core, 14,14a …… Tension detection mechanism, 16,16a …… Arm, 17, 17a …… Spring, 18,18a …… Tension sensor, 19,19a …… Roller, 21 …… Forward / reverse drive signal input terminal, 22 …… Pulse width modulation circuit, 23 …… Motor drive circuit, 24 …… Timing Circuit, 32 …… Oscillation circuit, 33,34 …… Power transistor, 38,39 …… Power regeneration thyristor, 47,48 …… Photothyristor coupler.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-50-18987 (JP, A) JP-A-56-88655 (JP, A) JP-A-57-195075 (JP, A) JP-A-59- 186863 (JP, A) JP-A-60-181349 (JP, A) JP-A-56-49685 (JP, A) Actually opened 57-183097 (JP, U)

Claims (1)

[Claims] 1. A plurality of rolls each wound with an object to be wound such as an electrode foil and a dielectric film, a core for laminating and winding a wound object of each roll in a predetermined direction, A DC servo motor connected to at least one rotation shaft of a plurality of rolls, a tension detection mechanism for detecting tension in the middle of unwinding of a wound object which is unwound from a roll to which the DC servo motor is connected, and the tension detection In a capacitor winder equipped with a forward / reverse drive circuit that controls the rotation direction and rotation speed of the DC servomotor based on the forward / reverse drive signal from the mechanism, the tension detection mechanism is configured to feed the wound object. A roller that rotatably contacts a part of the way, a swingable arm that mounts the roller, and a tension to the wound object that contacts the arm with the roller. Urging means for urging in the applying direction and a position change due to the swing of the arm are detected,
A tension sensor that outputs this as a forward / reverse drive signal for the DC servo motor is provided, and the forward / reverse drive circuit outputs the forward / reverse drive signal output from the tension sensor in accordance with its rotation direction and rotation speed. A pulse width modulation circuit for converting the positive and negative pulse width modulation signals, each one power transistor for supplying positive or negative electric power to the DC servo motor according to each of the positive and negative pulse width modulation signals, and the DC servo A pair of power regeneration thyristors connected in anti-parallel to the motor, in order to flow the counter electromotive force generated when the power supply to the DC servo motor is cut off in the forward direction, a trigger signal is output via a photothyristor coupler, A timing circuit for turning on any one of the power regeneration thyristors. And a condenser winder.