JP2009096491A - Wrapper feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material feeding apparatus in which rotational driving of a reel driving motor is linked with rotational driving of a delivery roller. <P>SOLUTION: The packaging material feeding apparatus includes a packaging material reel 10 made by winding a packaging material 1, the reel driving motor 20 for rotationally driving the packaging material reel 10, a reel driving motor controlling apparatus 70 for controlling the rotational speed of the reel driving motor 20, a delivery apparatus 40 for furthermore delivering the packaging material 1 delivered from the packaging material reel 10, a delivery motor 50 for driving the delivery apparatus 40, and a delivery motor controlling apparatus 60 for outputting a control signal for controlling the rotational speed of the delivery motor 50. This reel driving motor controlling apparatus 70 controls the rotational speed of the reel driving motor 20 so that the packaging material delivery speed from the packaging material reel 10 is linked with the packaging material delivery speed of the delivery apparatus 40 from the control signal output to the delivery motor 50 from the delivery motor controlling apparatus 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a packaging material supply device having a configuration in which a packaging material (packaging material) such as a film or a tape is wound around a packaging material reel and the packaging material fed from the packaging material reel is fed out to a packaging operation position. About.

This type of packaging material supply device is disclosed in, for example, Patent Document 1 filed earlier by the present applicant. The packaging material feeding device of Patent Document 1 has a configuration in which a reel driving motor that rotationally drives a packaging film reel is interlocked with a feeding motor that rotationally drives a feeding roller. Specifically, the rotation amount of the feeding roller is detected by a rotation detection rotary encoder, and the tension lever swing is detected by a position detection rotary encoder, and these detection signals are output to the controller. The amount of rotation of the reel drive motor was calculated (see FIG. 2 of Patent Document 1).
JP 11-245916 A

  However, the packaging material feeding device of Patent Document 1 inputs the rotation amount of the feeding roller detected by the rotation detection rotary encoder to the controller, and then the controller calculates the rotation amount of the reel drive motor. For this reason, there is a time difference between the actual rotational drive of the feeding motor and the rotational drive of the reel drive motor.

  Thereby, for example, when the packaging material feeding device is intermittently driven, the driving timing of the two motors is shifted, and the amount of the packaging film delivered from the packaging film reel may not match the amount of the packaging film delivered by the feeding roller. there were. Such a difference between the feeding amount and the feeding amount of the packaging film is caused by swinging a tension lever on the supply path to give excessive tension to the packaging material to be supplied or between the packaging film reel and the feeding roller. It was a cause of slack in the packaging material.

  The present invention has been made in view of the above-described circumstances. By using a control signal for driving the feeding means for driving the reel driving motor, the rotation driving of the reel driving motor is quickly linked to the driving of the feeding means. An object of the present invention is to provide a packaging material supply apparatus that can stably supply packaging materials.

In order to achieve the above object, the present invention provides a packaging material reel formed by winding a packaging material,
A reel drive motor that rotationally drives the packaging material reel;
Reel drive motor control means for controlling the rotational speed of the reel drive motor;
A feeding means for further feeding out the packaging material fed from the packaging material reel;
A feeding motor for driving the feeding means;
A feeding motor control means for outputting a control signal for controlling the rotational speed of the feeding motor;
A packaging material supply device comprising:
The reel drive motor control means is configured to cause the packaging material delivery speed from the delivery means to synchronize with the packaging material delivery speed from the packaging material reel based on a control signal output from the delivery motor control means to the delivery motor. It is characterized by having a configuration for controlling the rotation speed of.

  According to such a configuration, the reel drive motor control means controls the rotation speed of the reel drive motor in response to the control signal from the feed motor control means, so that the rotation drive of the reel drive motor and the rotation drive of the feed motor are easy. Can be linked to As a result, it is possible to supply the packaging material stably without giving extra tension to the packaging material due to the rotational drive difference between the two motors.

Further, the packaging material supply device abuts against the packaging material between the packaging material paths sent from the packaging material reel to the feeding means to apply tension to the packaging material, and the packaging material length between the packaging material paths. A tension member that displaces correspondingly,
Tension member position detecting means for detecting the position of the tension member;
Reel diameter calculating means for calculating the reel diameter of the packaging material reel based on the amount of displacement of the tension member from the preset target position;
The control signal output by the feeding motor control means is a speed control signal for controlling the rotation speed of the feeding motor,
The reel drive motor control means can control the reel drive motor based on the reel diameter calculated by the reel diameter calculation means and the speed control signal output from the feeding motor control means.

  By this reel diameter calculating means, it is possible to easily calculate the decreasing reel diameter based on the amount of displacement of the tension member that occurs during the packaging material supply. The reel drive motor control means can control the rotation speed by calculating the rotation speed of the reel drive motor based on the calculated reel diameter and the rotation speed of the feeding motor. Accordingly, the linkage between the reel drive motor and the feeding motor is performed with higher accuracy, and the amount of packaging material fed can be reduced.

  The reel drive motor control means can control the reel drive motor to return the tension member to the target position. The reel drive motor control means controls the reel drive motor to appropriately adjust the rotation speed of the packaging material reel. Thereby, the tension member can be returned to the target position. As a result, it becomes easy to continuously feed out the packaging material, and the packaging material can be supplied more stably.

Further, the reel diameter calculating means can calculate the reel diameter by the following formula based on the displacement amount of the tension member detected by the tension member position detecting means and the reel diameter calculated last time.
D _n = D _n-1 −2 / π × h (i)
here,
D _n : reel diameter D _n−1 : reel diameter calculated last time h: displacement amount of tension member

  According to the above equation (i), the reel diameter is calculated using only the tension member detection position and the previously calculated reel diameter. Thus, the reel diameter can be easily calculated without considering other factors. Further, if this equation (i) is used, when replacing the packaging reel, it is not necessary to input the exact reel diameter of the replaced packaging reel as an initial value. For example, when an appropriate initial value of the reel diameter is input and the packaging material reel is rotationally driven, a difference from the actual reel diameter appears as a displacement amount of the tension member. Therefore, the actual reel diameter value is calculated from this displacement amount. be able to. Therefore, the initial setting associated with the replacement of the packaging material reel is facilitated, and the workability is further improved.

  Further, the reel drive motor control means until the speed of the feed motor reaches the speed indicated by the speed control signal of the feed motor 50 after the feed motor control means outputs the speed control signal to the feed motor. Delay and delay until the speed of the reel drive motor reaches the speed indicated by the control signal of the reel drive motor 20 after the feeding motor control means outputs the speed control signal to the reel drive motor control means. It is preferable to control the reel drive motor at a speed obtained by multiplying the difference due to the difference as a coefficient.

  Here, in general, the motor speed is delayed until it reaches the control signal output from the control device. This delay varies depending on the capabilities of the motor and control device. Therefore, as described above, by correcting the rotational speed of the reel drive motor with the coefficient obtained from the actual delay difference, the feeding motor 50 and the reel drive motor 20 can be more accurately set regardless of the capabilities of the motor and the control device. Can be linked.

  As described above, according to the packaging material supply apparatus of the present invention, the rotational drive of the reel drive motor can be further linked to the rotational drive of the feeding motor. In addition, the rotational drive of the reel drive motor and the feeding motor can be linked to reduce the amount of displacement of the tension roller that is displaced due to the difference in the amount of packaging material delivered, thereby suppressing the error in the amount of packaging material delivered. The material can be supplied stably.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing the overall structure of a vertical bag making filling and packaging machine to which a packaging material supply apparatus according to an embodiment of the present invention is applied.
As shown in the figure, the packaging material supply apparatus includes a packaging material reel 10, a reel drive motor 20, a tension unit 30, a feeding device (feeding means) 40, and a feeding motor 50. Each of these structures is attached to a predetermined position of the vertical bag making filling and packaging machine, and functions as a device for supplying the packaging material 1 of the packaged product to the packaging material supply position. In addition, since it is a conventionally well-known technique about a vertical bag making filling packaging machine, detailed description of the structure which is not related to this invention is abbreviate | omitted.

  The packaging material 1 is wound around a packaging material reel 10, and is attached to and detached from the rotary drive shaft 11 integrally with the reel 10. The rotational drive shaft 11 is intermittently rotationally driven by the reel drive motor 20. In the present embodiment, a servo motor is used as the reel drive motor 20 to enable highly accurate rotation speed control. The packaging material reel 10 mounted on the rotary drive shaft 11 is rotated by the rotational driving force of the reel drive motor 20 and feeds the wound packaging material 1.

  A tension unit 30 is provided on the supply path of the packaging material 1 delivered from the packaging material reel 10. The tension unit 30 includes a pair of fixed rollers 31, a tension roller (tension member) 32 interposed between the fixed rollers 31, and a potentiometer (tension member position detecting means) for detecting the position of the tension roller 32. 33.

  In the pair of fixed rollers 31, one on the upstream side folds the packaging material 1 sent out from the packaging material reel 10, and the other on the downstream side sends the packaging material 1 to the feeding device 40 side. The tension roller 32 is a cylindrical member having a predetermined weight, and is movable up and down between the fixed rollers 31.

  The packaging material 1 delivered from the packaging material reel 10 is wound in a zigzag manner between the tension roller 32 and the fixed roller 31 and then guided to the feeding device 40. Here, the packaging material 1 wound between the tension roller 32 and the fixed roller 31 is given a certain tension by the self-weight of the tension roller 32 and is prevented from loosening.

  The potentiometer 33 of the tension unit 30 is provided to face the tension roller 32 and has a function of detecting the current position of the tension roller 32 by a change in resistance value. The position of the tension roller 32 detected by the potentiometer 33 is sent as a position detection signal to a reel drive motor control device 70 described later.

The feeding device 40 includes a driving side feeding roller 41 and a driven side feeding roller 42 and a feeding belt 43 wound around these rollers, and is provided in a pair on the side surface of the bag making tube of the vertical bag making filling and packaging machine. Yes. The driving-side feeding roller 41 of the feeding device 40 is connected to a feeding motor 50 and rotates intermittently by receiving the rotational driving force of the motor. Then, the rotation of the driving side feeding roller 41 rotates the driven side feeding roller 42 via the feeding belt 43. Thereby, the feeding belt 43 of the feeding device 40 rotates so as to feed the packaging material 1 downward along the bag making tube. Note that a servo motor is used as the feeding motor 50 of the present embodiment, which enables highly accurate rotation speed control.
The packaging material 1 fed out from the packaging material reel 10 is fed out to a packaging work position below the bag-making tube by driving the feeding device 40.

  An encoder 51 is provided on the rotational drive shaft of the feeding motor 50. The encoder 51 has a function of detecting the rotation angle of the feeding motor 50 as a pulse signal and transmitting the rotation angle detection signal to a feeding motor control device 60 described later.

FIG. 2 is a block diagram showing a control system of the reel drive motor 20 and the feeding motor 50 according to the present embodiment.
As shown in FIGS. 1 and 2, the packaging material supply apparatus includes a feeding motor control device (feeding motor control means) 60 and a reel driving motor control device (reel driving motor control means) 70 as a control system. Yes. In the present embodiment, a servo amplifier that controls the rotational drive of the feed motor 50 is applied to the feed motor control device 60, while an inverter device that controls the rotational drive of the reel drive motor 20 is applied to the reel drive motor control device 70. Applicable.

  The feeding motor control device 60 receives a position command signal from an external control means (for example, a control device for a vertical bag making, filling and packaging machine), performs operations such as position control and speed control, and rotationally drives the feeding motor 50. A control signal for controlling is output. Further, as described above, the feeding motor control device 60 receives the rotation angle detection signal transmitted from the encoder 51, and thereby feedback controls the feeding motor 50.

Specifically, the rotation angle detection signal received from the encoder 51 is converted into a position signal and a speed signal, and the position command signal is corrected based on the fed back position signal and converted into a speed control signal. Further, the speed control signal is corrected based on the fed back speed signal, converted into a control signal for rotating the feeding motor 50, and the control signal is output.
By such feedback control, rotation driving of the feeding motor 50 is controlled, and further, the driving speed of the feeding device 40 is also controlled.

  On the other hand, the reel drive motor control device 70 has a function of automatically controlling the rotation speed of the reel drive motor 20. The reel drive motor control device 70 is provided with a reel diameter calculation unit (reel diameter calculation means) 71 and a reel speed calculation unit 72.

  Here, in the packaging material feeding device of Patent Document 1, a detection signal from the rotation detection rotary encoder is input to the controller, and the controller calculates the rotation speed of the reel drive motor based on this detection signal (the same document). (See FIG. 2). For this reason, the actual rotational drive of the reel drive motor is delayed from the rotational drive of the feeding motor. As a result, the drive timings of the two motors are shifted, and the packaging material feed amount from the packaging material film reel may not match the packaging material feed amount by the feeding roller.

  However, the reel drive motor control device 70 of this embodiment is directly connected to the feeding motor control device 60, receives the speed control signal output from the device 60, and the reel speed calculation unit 72 receives the reel drive motor. In this configuration, 20 rotation speeds are calculated. As a result, the reel drive motor control device 70 can calculate the rotation speed of the reel drive motor 20 without producing a large time error, and greatly reduces the drive timing deviation between the feeding motor 50 and the reel drive motor 20. Can be made.

FIG. 3 is a schematic diagram showing a concept for calculating the reel diameter and the rotational speed of the reel drive motor 20 according to the present embodiment.
Reel diameter calculation unit 71 receives the position detection signal from the potentiometer 33 of the tension unit 30 has a function for calculating a reel diameter D _n. Here, the feeding device 40 and the packaging material reel 10 are interlocked so that the packaging material feeding speed and the packaging material feeding speed of the packaging material reel 10 become equal at a predetermined reel diameter. Therefore, when the reel diameter decreases, the amount of the packaging material 1 delivered by the packaging material reel 10 decreases, and the position of the tension roller 32 is displaced by the decrease. Therefore, in the present invention, the calculation of the reel diameter is calculated based on the displacement amount of the tension roller 32 that occurs during the packaging material supply. That is, in the packaging material supply device, when the reel diameter decreases, the packaging material delivery amount also decreases, which is reflected in the tension roller 32 that applies tension to the packaging material 1, and the tension roller 32 moves upward. Therefore, the reel diameter D _n has the following relational expression based on the previously calculated reel diameter D _n−1 and the displacement amount h of the tension roller 32.
πD _n-1 −πD _n = 2h
From the above formula, the reel diameter D _n can be calculated by the following formula.
D _n = D _n-1 −2 / π × h (i)

The packaging material supply apparatus according to the present embodiment performs an operation of returning the tension roller 32 to the original position in response to the displacement of the tension roller 32 while the feeding motor 50 is stopped. That is, the tension roller 32 Yes set target position X ₀ in advance, the reel drive motor control unit 70 feeds the packaging material 1 by controlling the reel drive motor 20, to return the tension roller 32 to the target position X ₀ Yes. Thereby, it becomes easy to continuously feed out the packaging material, and a more stable supply of the packaging material is possible.
Therefore, the displacement amount h of the tension roller 32 which occurs during packaging material supply is determined by the following equation by the position X _n target position X ₀ and when the reel diameter calculation previously set.
h = X _n −X ₀ (ii)

The reel diameter calculator 71 calculates the reel diameter D _n using these equations (i) and (ii), and outputs the calculation result to the reel speed calculator 72. Further, when the equations (i) and (ii) are used, when replacing the packaging material reel 10, it is not necessary to input the exact reel diameter of the replaced packaging material reel 10 as an initial value. For example, when an appropriate initial value of the reel diameter is input and the packaging material reel 10 is rotationally driven, a difference from the actual reel diameter appears as the displacement amount h of the tension roller 32. Therefore, the actual reel diameter D is calculated from the displacement amount h. The value of _n can be calculated. Therefore, the initial setting associated with the replacement of the packaging material reel 10 is facilitated, and the workability is further improved.

  The reel speed calculation unit 72 of the reel drive motor control device 70 has a function of calculating the rotation speed of the reel drive motor 20. The reel speed calculation unit 72 is connected to the feeding motor control device 60 as described above, and is configured so as to be able to constantly receive the output speed control signal.

  The reel drive motor control device 70 is provided with a storage device (not shown), and the reel diameter calculated by the reel diameter calculation unit 71 is stored in a timely manner. Therefore, the reel speed calculation unit 72 can calculate the rotation speed of the reel drive motor 20 using the latest reel diameter calculation result stored in the storage device. As a result, the fluctuation of the reel diameter can be reflected in real time on the rotation speed of the reel drive motor 20, and more accurate rotation drive control can be realized.

The calculation of the rotational speed of the reel drive motor 20 in the reel speed calculation unit 72 is based on the speed control signal and the reel diameter, and the packaging material delivery speed from the packaging material reel 10 is almost equal to the packaging material delivery speed by the delivery motor 50. They are calculated so as to be equal (see FIG. 3). Specifically, in proportion to the rotational speed V _k of the feeding motor 50, so as to be inversely proportional to the reel diameter D _n, seeking rotational speed V of the reel drive motor 20 by the following equation.
V = 1 / D _n × α × V _k (iii)

  Here, α is a control coefficient associated with the calculation of the rotational speed of the reel drive motor 20 and is set from the diameter of the drive side feeding roller 41 of the feeding device 40, the speed reducer, and the like.

  In general, the motor speed is delayed until it reaches the speed indicated by the control signal output from the control device. This delay varies depending on the capabilities of the motor and control device. Therefore, when the reel driving motor 20 and the feeding motor 50 are different, the reel driving motor control device 70 causes the actual speed of the feeding motor 50 after the feeding motor control device 60 outputs a speed control signal to the feeding motor 50. Until the speed reaches the speed indicated by the speed control signal of the feeding motor 50, and after the feeding motor control device 60 outputs the speed control signal to the reel driving motor control device 70, the actual reel driving It is preferable to control the reel drive motor 20 to a speed obtained by multiplying the difference due to the difference between the speed of the motor 20 and the speed indicated by the control signal of the reel drive motor 20 as a coefficient. By controlling in this way, the feeding motor 50 and the reel drive motor 20 can be linked more accurately regardless of the capabilities of the motor and the control device.

Furthermore as already mentioned, the reel drive motor controller 70, while stopping the feeding motor 50 controls the rotation driving of the reel motor 20 so as to return the position of the tension roller 32 to the target position X ₀ . The reel speed calculation unit 72 performs position return calculation in order to control the driving of the reel drive motor 20.

When performing the position return calculation, a position detection signal of the position _Xn of the tension roller 32 detected by the potentiometer 33 is received after a predetermined process while the feeding motor 50 is stopped. Then, the rotational speed V of the reel drive motor 20 is obtained by the following equation.
V = p (X _n −X ₀ ) (iv)

Here, p is in the stopping of the feeding motor 50, a position back factor for reliably returned to the tension roller 32 to the target position X _0, the ability or the like of the stop time and the reel drive motor 20, and set in advance is there.
The reel drive motor control device 70 controls the rotational speed V of the reel drive motor 20 based on the calculation result of the equation (iv). And while stopping the feeding motor 50, since the packaging material 1 is delivered by rotationally driving the reel drive motor 20, will be the tension roller 32 moves downward, thereby returning to the target position X ₀ be able to.

Next, the control operation of the packaging material supply apparatus described above will be described more specifically with reference to a flowchart. FIG. 4 is a flowchart showing the control operation of the vertical bag making filling packaging machine to which the packaging material supply apparatus according to this embodiment is applied.
As shown in the figure, the control device of the vertical bag making filling and packaging machine first checks whether or not the packaging material reel 10 has been replaced (step S1). When it is determined that the packaging material reel 10 has been replaced, it is displayed on the monitor and input so as to input a new reel diameter to the operator (step S2). Thereafter, it is determined whether or not the operator has input a reel diameter (step S3). On the other hand, if it is determined that the packaging material reel 10 has not been replaced, the reel diameter before stopping in the previous operation is called from the storage device (step S4).

  Next, it is determined whether or not the reel diameter is the minimum diameter capable of supplying the packaging material of the packaged product (step S5). Here, if the reel diameter of the packaging material reel 10 is larger than the minimum diameter, a speed control signal output from the feeding motor 50 is input to the reel drive motor control device 70 (step S6). On the other hand, if the reel diameter is small, a stop signal for each motor is output and the operation of the apparatus is stopped (step S7).

  After step S6, the current position of the tension roller 32 detected by the potentiometer 33 is input to the reel drive motor control device 70 (step S8). Further, the rotational speed of the feeding motor 50 is determined (step S9). If the rotational speed of the feeding motor 50 is 0 or more, the process proceeds to step S10, and if the rotational speed is 0 (stopped), the process proceeds to step S12. move on.

  In this embodiment, the reel diameter is calculated while the feeding motor 50 is stopped. With this configuration, it is possible to calculate the reel diameter more accurately than when calculating during rotation of the packaging material reel 10. The reason why the reel diameter calculation is stopped only once is that the amount of displacement h changes because the packaging material reel 10 is rotated to return the tension roller 32 to the target position. For this reason, the reel diameter calculation unit 71 of the reel drive motor control device 70 determines whether or not to calculate the reel diameter by setting a reel diameter calculation flag.

  When it is determined that the feeding motor 50 is being driven, the reel diameter calculation flag is always set to 1 (step S10). Then, the rotational speed of the reel drive motor 20 is calculated using the arithmetic expression (iii) (step S11).

  On the other hand, if it is determined that the feeding motor 50 is stopped, it is first determined whether the reel diameter calculation flag is 1 or 0 (step S12). When the reel diameter calculation flag is 1, the reel diameter calculation unit 71 calculates the reel diameter using the calculation formulas (i) and (ii) (step S13). Further, the remaining amount of the packaging material wound around the packaging material reel 10 is calculated from the calculated reel diameter (step S14), and the calculated reel diameter and the remaining packaging material amount are displayed on the monitor (step S15).

  Next, the reel speed calculation flag is changed to 0 (step S16), and in order to control the tension roller 32 to return to the target position, the reel speed calculation unit 72 uses the calculation formula (iv) to calculate the rotational speed V of the reel drive motor 20. Is calculated (step S17).

  In the above processing flow, the reel diameter calculation flag is changed from 1 to 0 in step S16. That is, when the reel diameter calculation flag is 0 in step S12, it means that the reel diameter has already been calculated while the feeding motor 50 is stopped. Therefore, in step S12, when the reel diameter calculation flag is 0, step S13 to step S16 are skipped and step S17 is performed.

  Finally, the calculation result of the rotational speed of the reel drive motor is output to the reel drive motor from step S11 or step S17 as a control signal (step S18). When the above processing flow ends, the process returns to step S5 again and the same flow is repeated.

  As described above, in the packaging material supply apparatus according to the present embodiment, the speed control signal of the feeding motor control device 60 is transmitted to the reel driving motor control device 70. Therefore, the rotation of the feeding motor 50 and the reel driving motor 20 is performed. The drive can be linked without giving a large error. Further, by interlocking the motors 20 and 50, the reel diameter of the packaging material reel 10 can be easily calculated based on the displacement amount of the tension roller 32 that occurs during the packaging material supply. The accuracy of the interlocking of the motors 20 and 50 can be further improved by reflecting this in the rotational drive. Further, by improving the accuracy of such interlocking, the packaging material supply apparatus can reduce the amount of displacement of the tension roller 32 during operation of the apparatus. It becomes possible to carry out the supply stably.

  Further, the present invention is not limited to the above-described embodiment, and various modifications and application examples are of course possible. For example, the vertical bag making filling and packaging machine of the present embodiment is configured to intermittently supply the packaging material, but for the packaging machine configured to continuously supply the packaging material, for the start of operation and other reasons The same can be applied to the case where the speed fluctuates. However, in that case, it is necessary to increase the rotation of the packaging material reel by a predetermined time in order to return the tension roller to the target position.

It is the schematic which shows the whole structure of the vertical bag making filling packaging machine to which the packaging material supply apparatus which concerns on this embodiment is applied. It is a block diagram which shows the control system of the reel drive motor and feed motor which concern on this embodiment. It is a schematic diagram which shows the concept for calculating the reel diameter which concerns on this embodiment, and the rotational speed of a reel drive motor. It is a flowchart which shows the control operation | movement of the vertical bag making filling packaging machine to which the packaging material supply apparatus which concerns on this embodiment is applied.

Explanation of symbols

1: packaging material 10: packaging material reel, 11: rotation drive shaft,
20: Reel drive motor,
30: Tension unit, 31: Fixed roller, 32: Tension roller, 33: Potentiometer,
40: feeding device, 41: driving side feeding roller, 42: driven side feeding roller, 43: feeding belt,
50: Feeding motor, 51: Encoder 60: Feeding motor control device,
70: reel drive motor controller, 71: reel diameter calculator, 72: reel speed calculator,

Claims (5)

A packaging reel formed by winding a packaging material;
A reel drive motor that rotationally drives the packaging material reel;
Reel drive motor control means for controlling the rotational speed of the reel drive motor;
A feeding means for further feeding out the packaging material fed from the packaging material reel;
A feeding motor for driving the feeding means;
A feeding motor control means for outputting a control signal for controlling the rotation speed of the feeding motor;
A packaging material supply device comprising:
The reel drive motor control means links the packaging material feed speed from the packaging material reel to the packaging material feed speed of the feeding means based on a control signal output from the feeding motor control means to the feeding motor. The packaging material supply apparatus is configured to control the rotational speed of the reel drive motor. In the packaging material supply apparatus of Claim 1,
The packaging material is brought into contact between the packaging material paths from the packaging material reel to the feeding means to apply tension to the packaging material, and corresponds to the packaging material length between the packaging material paths. A displacement tension member;
Tension member position detecting means for detecting the position of the tension member;
Reel diameter calculating means for calculating a reel diameter of the packaging material reel based on a displacement amount from a preset target position of the tension member;
The control signal output by the feeding motor control means is a speed control signal for controlling the rotation speed of the feeding motor,
The reel driving motor control means controls the reel driving motor based on a reel diameter calculated by the reel diameter calculating means and a speed control signal output from the feeding motor control means. apparatus. The packaging material supply apparatus according to claim 2, wherein the reel drive motor control means controls the reel drive motor so as to return the tension member to the target position. 3. The reel diameter calculating means calculates the reel diameter by the following formula based on the displacement amount of the tension member detected by the tension member position detecting means and the reel diameter calculated last time. Or the packaging material supply apparatus of 3.
D _n = D _n−1 −2 / π × h
here,
D _n : reel diameter D _n−1 : reel diameter calculated last time h: displacement amount of tension member The reel drive motor control means reaches the speed indicated by the speed control signal of the feeding motor 50 after the feeding motor control means outputs a speed control signal to the feeding motor. And the speed at which the speed of the reel drive motor is indicated by the control signal of the reel drive motor 20 after the feed motor control means outputs a speed control signal to the reel drive motor control means. 5. The packaging material supply apparatus according to claim 2, wherein the reel drive motor is controlled at a speed obtained by multiplying a difference due to a difference between the delay time and the delay time as a coefficient.

Images