JP3725324B2 - Packaging material feeding apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a configuration in which an endless 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 work position by a feeding roller. The present invention relates to a packaging material feeding device.
[0002]
[Prior art]
FIG. 8 is a block diagram showing an outline of a conventional packaging material feeding device of this type.
The conventional packaging material feeding device shown in FIG. 1 includes a packaging material reel 101, a feeding roller 102, a tension unit 103, and the like. An endless packaging material 100 is wound around the packaging material reel 101 in advance, and the packaging material reel 101 is rotated by the rotational driving force of the reel drive motor 104 to send out the packaging material 100.
[0003]
The feeding roller 102 includes a pair of driving side feeding rollers 102a and a driven side feeding roller 102b. The driving side feeding roller 102a is rotated by the rotational driving force of the feeding motor 105, and the packaging material gripped between the feeding rollers 102a and 102b. 100 is fed out to a predetermined packaging work position.
[0004]
The tension unit 103 includes a fixed roller 106 supported by the apparatus main body, a tension lever 108 that is swingable about a support shaft 108a and biased in one direction by a biasing member 107 such as a spring, and the tension lever. A tension roller 109 supported by 108 is provided, and is provided at an intermediate position between the packaging material reel 101 and the feeding roller 102.
[0005]
The packaging material 100 delivered from the packaging material reel 101 is wound in a zigzag manner between the fixed roller 106 and the tension roller 109 in the tension unit 103 and then guided to the feeding roller 102.
The tension unit 103 has a function of preventing loosening by applying a certain tension to the packaging material 100 wound between the fixed roller 106 and the tension roller 109 with the urging force of the tension lever 108. .
[0006]
[Problems to be solved by the invention]
In the above-described packaging material feeding device, it is desirable that the packaging material feeding amount from the packaging material reel 101 is equal to the packaging material feeding amount by the feeding roller 102. However, as the packaging material winding diameter of the packaging material reel 101 decreases, the packaging material delivery amount from the packaging material reel 101 changes.
[0007]
Therefore, conventionally, a brake 110 is provided so as to be able to contact and separate with respect to the support shaft 101a of the packaging material reel 101, and the rotation speed of the packaging material reel 101 is controlled by an operator manually operating the brake 110. I was adjusting.
However, in the rotation speed adjustment of the packaging material reel 101 by the brake 110 as described above, the load acting on the reel drive motor 104 becomes excessive, not only shortening the life of the motor 104 but also adjusting manually by the worker. For this reason, high-accuracy adjustment cannot be performed, and the position of the tension lever 108 may fluctuate and the packaging material 100 may be loosened.
[0008]
In contrast to such a conventional technique, a packaging web feeding device disclosed in Japanese Patent Application Laid-Open No. 9-216608 detects the degree of lifting of a weight roll (corresponding to a tension lever) with a weight roll sensor, and the weight roll A configuration is provided in which the amount of rotation of the roll holder shaft (corresponding to the packaging material reel) is variably controlled so as to reach the target position.
[0009]
According to the packaging web feeding device disclosed in the publication, the amount of the packaging material fed from the roll holder shaft (corresponding to the packaging material reel) is adjusted by controlling the position of the weight roll (corresponding to the tension lever). In addition, it is described that it can be made equal to the packaging material feeding amount by the web feeding roll (corresponding to the feeding roller).
[0010]
However, in the packaging web feeding device disclosed in the publication, the driving control of the web feeding roll (corresponding to the feeding roller) and the driving control of the roll holder shaft (corresponding to the packaging material reel) are separate control systems. Therefore, when the web feed roll (corresponding to the feed roller) is speed-changed, the weight roll (corresponding to the tension lever) is hunted immediately after the start of the speed change operation. As a result, there was a risk that the tension acting on the packaging material would fluctuate greatly.
[0011]
Such fluctuations in tension with respect to the packaging material cause slack in the packaging material or cause the packaging material to be broken by the action of excessive tension.
The present invention has been made in view of the above-described circumstances, and enables the packaging material to be fed from the packaging material reel in accordance with the amount of packaging material fed by the feeding roller, regardless of the operation content of the feeding roller. For the purpose.
[0012]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a packaging material reel for winding a packaging material, a reel drive motor for rotationally driving the packaging material reel, and a packaging material fed from the packaging material reel to a packaging work position. In a packaging material feeding device including a feeding roller that feeds and a feeding motor that rotationally drives the feeding roller, a feeding roller rotation detecting unit that detects a rotation amount of the feeding roller, and a signal from the feeding roller rotation detecting unit And reel drive motor control means for controlling the amount of rotation of the reel drive motor.
[0013]
According to the configuration of the present invention, since the rotation amount of the reel drive motor is controlled based on the rotation amount of the feeding roller, even when the feeding roller is operated at a variable speed, the change in the rotation amount of the feeding roller is followed. The amount of rotation of the reel drive motor is adjusted. As a result, an appropriate amount of packaging material corresponding to the packaging material feeding amount by the feeding roller can be sent out from the packaging material reel.
[0014]
The present invention also provides a tension member that applies tension to the packaging material fed from the packaging material reel and guides it to the feeding roller, and is movable in a predetermined direction, a position detection means for detecting the position of the tension member, Reel rotation correction means for correcting the amount of rotation of the reel drive motor in a predetermined cycle based on the position of the tension member detected by the position detection means and correcting the position of the tension member to a predetermined reference position. And
[0015]
According to the configuration of the present invention, since a certain tension is applied to the packaging material by the tension member, the packaging material can be supplied to the feeding roller in an appropriate state without sagging the packaging material. In addition, since the position of the tension member is detected and the amount of rotation of the reel drive motor in a predetermined cycle is corrected based on the detected position of the tension member, the position of the tension member is corrected to a predetermined reference position. It is possible to always keep the tension acting on the material constant.
[0016]
For example, based on the following equation, the amount of rotation of the reel drive motor in a predetermined cycle can be corrected, and the position of the tension member can be corrected to a predetermined reference position.
V = (Lf−Lt) / 2πR (1)
Lt = (X−Xo) × Tk (2)
[0017]
here,
V: Rotation amount of the reel drive motor in a predetermined cycle after correction
Lf: the feeding amount of the packaging material of the feeding roller in a predetermined cycle
X: Current position of detected tension member
Xo: Reference position of tension member
Tk: a coefficient for converting the amount of displacement of the tension member with respect to the reference position into the amount of packaging material delivered from the packaging material reel
Lt: the amount of packaging material delivered from the packaging material reel required to return the tension member from the detected position to the reference position
R: Packaging material winding diameter (radius) of packaging material reel
It is.
[0018]
If the position X of the tension member is detected, the packaging material feed amount Lt of the packaging material reel that is required to return the tension member from the current position X to the reference position Xo can be calculated by equation (2). Then, based on the packaging material delivery amount Lt, the packaging material delivery amount Lf from the packaging material reel in a predetermined cycle set before correction, and the packaging material winding diameter R of the packaging material reel, The rotation amount (corrected rotation amount) V of the reel drive motor in the next cycle can be calculated.
[0019]
The packaging material winding diameter R of the packaging material reel is determined by rotating the packaging material reel by a predetermined amount while the feeding roller is stopped, detecting the displacement amount of the tension member corresponding to the rotation amount of the packaging material reel, By calculating the sending or winding amount of the packaging material by the rotation of the packaging material reel from the detected displacement amount, it is possible to calculate based on the sending or winding amount of the packaging material and the rotation amount of the packaging material reel.
[0020]
That is, the delivery or winding amount L of the packaging material ₁₂ Can be calculated by, for example, the following equation (3), and further, the packaging material winding diameter R of the packaging material reel can be calculated by the following equation (4).
L ₁₂ = (X ₂ -X ₁ ) × Tk (3)
R = L ₁₂ / 2πn (4)
X ₁ : Position of tension member before rotating packaging reel
X ₂ : Position of the tension member after rotating the packaging material reel
n: Rotation amount of packaging material reel
[0021]
As described above, the packaging material winding diameter of the packaging material reel decreases for a while as the packaging material is delivered. Therefore, in the present invention, when the average displacement of the tension member with respect to the reference position over a predetermined cycle exceeds a predetermined value, the packaging material winding diameter R of the packaging material reel is recalculated based on the average displacement of the tension member. It is preferable.
[0022]
By recalculating the packaging material winding diameter R in this way, it is possible to correct the calculation error of the packaging material delivery amount that accompanies the decrease in the actual packaging material winding diameter. Since this recalculation is performed based on the average displacement of the tension member over a predetermined cycle, the packaging material winding diameter R is properly calculated without being affected by sudden swinging of the tension member due to disturbance or the like. can do.
[0023]
In this specification, the packaging material (packaging material) includes various endless packaging supply materials wound around a reel. For example, the packaging material includes not only a packaging film for packaging an article but also an opening tape (opening tape) fused to the packaging film. In this case, the packaging material reel may be referred to as an opening tape reel.
[0024]
In the present invention, the tension member includes various urging means for applying tension to the packaging material fed from the packaging material reel and guiding it to the feeding roller. For example, a tension lever that swings around a fulcrum, a dancer roller that applies tension to the packaging material by its own weight, and a weight roll disclosed in Japanese Patent Laid-Open No. 9-216608 correspond to a tension member.
Moreover, as a position detection means for detecting the position of the tension member, for example, a rotary encoder or various displacement sensors can be applied.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the overall structure of a packaging material feeding device according to an embodiment of the present invention. The packaging material feeding apparatus shown in the figure includes a packaging film reel (packaging material reel) 2 for supplying an endless packaging film (packaging material) 1.
[0026]
The endless packaging film 1 is wound around a packaging film reel 2 and is attached to and detached from the rotary drive shaft 3 integrally with the reel 2. The rotational drive shaft 3 is rotationally driven by a reel drive motor 4. In this embodiment, a servo motor is used as the reel drive motor 4 to enable highly accurate rotation speed control. Then, the packaging film reel 2 mounted on the rotational drive shaft is rotated by the rotational driving force of the reel driving motor 4, and the wound packaging film 1 is fed out.
[0027]
On the supply path of the packaging film 1 fed out from the packaging film reel 2, a feeding roller 5 is provided. Further, a tension unit 6 is provided between the packaging film reel 2 and the feeding roller 5.
[0028]
The tension unit 6 is provided on the supply path of the packaging film 1 fed from the packaging film reel 2, and includes a tension lever (tension member) 8 having a tension roller 7 attached to the tip thereof, and a fixed roller 9 attached to the apparatus main body. And.
The tension lever 8 is swingable about the support shaft 10 and is always biased in one direction (counterclockwise in the figure) by a biasing means 11 such as a spring.
[0029]
The packaging film 1 delivered from the packaging film reel 2 is wound in a zigzag manner between the tension roller 7 and the fixed roller 9 and then guided to the feeding roller 5. Here, the packaging film 1 wound between the tension roller 7 and the fixed roller 9 is pulled with a constant tension by the urging force acting on the tension lever 8 and is prevented from loosening.
[0030]
The feeding roller 5 includes a pair of driving side feeding rollers 5 a and a driven side feeding roller 5 b, and the driving side feeding roller 5 a is rotated by receiving the rotational driving force of the feeding motor 12. A servo motor is used as the feeding motor 12 to enable highly accurate rotation speed control.
The feeding roller 5 holds the packaging film 1 fed from the packaging film reel 2 and feeds it to a packaging work position of a packaging device (not shown).
[0031]
In the packaging material feeding device having the above-described configuration, a rotation detecting rotary encoder (feeding roller rotation detecting means) 15 is provided on the rotational drive shaft of the feeding motor 12. The rotation detecting rotary encoder 15 detects the amount of rotation of the driving side feeding roller 5a and outputs a detection signal to the controller 20 described later.
The support shaft 10 of the tension lever 8 is provided with a position detecting rotary encoder (position detecting means) 16. The position detection rotary encoder 16 detects the position of the tension lever 8 (in this embodiment, the swing position) and outputs a detection signal to the controller 20 described later.
[0032]
FIG. 2 is a block diagram showing a control system of the reel drive motor 4.
The amount of rotation of the reel drive motor 4 is automatically controlled by a controller (reel drive motor control means) 20. As described above, the controller 20 receives the detection signal from the rotation detection rotary encoder 15 and controls the amount of rotation of the reel drive motor 4 based on the detection signal.
[0033]
That is, the controller 20 stores the radius R ′ of the driving-side feeding roller 5a and the winding diameter R of the packaging film reel 2 by default, and the radius R ′ of the driving-side feeding roller 5a and the winding of the packaging film reel 2 are stored. In accordance with the ratio with the diameter R, the rotation amount N of the reel drive motor 4 is controlled based on the following equation.
N = (R ′ / R) N ′ (5)
N ′: Rotation amount of driving side feeding roller
[0034]
In addition, when the winding diameter R of the packaging film reel 2 is corrected by a recalculation process to be described later, it is appropriately rewritten to the corrected value. In FIG. 2, reference numeral 21 denotes a D / A converter for D / A converting a control signal from the controller 20 and sending it to the reel drive motor 4.
[0035]
Further, the controller 20 inputs a detection signal from the position detection rotary encoder 16 every predetermined cycle, reads the swing angle of the tension lever 8 from the detection signal, and packs in the predetermined cycle based on the swing angle. The rotation amount of the film reel 2 is corrected.
[0036]
That is, even if the amount of rotation of the reel drive motor 4 is controlled in proportion to the amount of rotation of the feeding roller 5, the amount of packaging film fed from the packaging film reel 2 and the amount of feeding of the packaging film 1 by the feeding roller 5 are slightly increased. It is inevitable that an error occurs between the two. The error appears as displacement of the tension lever 8. For example, when the amount of packaging film fed from the packaging film reel 2 is larger than the amount of packaging film fed from the feeding roller 5, the tension lever 8 is displaced counterclockwise in FIG. On the other hand, if the amount of the packaging film fed from the packaging film reel 2 is smaller than the amount of the packaging film fed from the feeding roller 5, the tension lever 8 is displaced clockwise in FIG.
[0037]
Therefore, in this embodiment, the reference position Xo of the tension lever 8 is set in advance, and the controller 20 reads the swing position X of the tension lever 8 every predetermined cycle based on the detection signal from the position detection rotary encoder 16. Based on the equation (2), the packaging film feed amount Lt from the packaging film reel 2 required to return the tension lever 8 from the swing position X to the reference position Xo is calculated.
[0038]
Lt = (X−Xo) × Tk (2)
Here, Tk is a coefficient for converting the displacement amount (X-Xo) of the tension lever 8 with respect to the reference position into the packaging film feed amount from the packaging film reel 2, and is obtained in advance by experiments.
[0039]
Subsequently, the controller 20 calculates the rotation amount V of the reel drive motor 4 in the next cycle based on the equation (1), and corrects the rotation amount of the reel drive motor 4 according to the rotation amount V.
V = (Lf−Lt) / 2πR (1)
Here, Lf is the packaging film feeding amount of the feeding roller 5 in a predetermined cycle, and R is the winding diameter (radius) of the packaging film reel 2.
[0040]
By performing such correction, the position of the tension lever 8 is stabilized, and adverse effects such as looseness of the packaging film 1 and breakage due to excessive tension can be avoided. Now, the winding diameter R of the packaging film reel 2 is calculated in the initial setting before starting and stored in the controller 20 in advance.
[0041]
That is, when the feeding roller 5 is stopped, the packaging film reel 2 is rotated by a predetermined amount n, and the displacement amount (X of the tension lever 8 corresponding to the rotation amount n of the packaging film reel 2) ₂ -X ₁ ) Is detected by the controller 20, and the detected displacement (X ₂ -X ₁ ) From the packaging film reel 2 by rotation of the packaging film reel 2 or winding amount L ₁₂ Is calculated by equation (3).
[0042]
L ₁₂ = (X ₂ -X ₁ ) × Tk (3)
X ₁ : Position of the tension lever 8 before rotating the packaging film reel 2
X ₂ : Swing position of the tension lever 8 after rotating the packaging film reel 2
[0043]
Next, the delivery or winding amount L of the packaging film 1 ₁₂ And the controller 20 determines the winding diameter R of the packaging film reel 2 based on the rotation amount n of the packaging film reel 2.
Calculate and store according to equation (4).
R = L ₁₂ / 2πn (4)
[0044]
As described above, the winding diameter R of the packaging film reel 2 decreases for a while as the packaging film 1 is fed out. Therefore, in this embodiment, when the average displacement of the tension lever 8 with respect to the reference position Xo over a predetermined cycle exceeds a predetermined value, the controller 20 controls the winding of the packaging film reel 2 based on the average displacement of the tension lever 8. The diameter R is recalculated and rewritten. .
[0045]
That is, the controller 20 stores the swing position of the tension lever 8 over a predetermined number of cycles based on the detection signal from the position detection rotary encoder 16, and calculates the average displacement Xt with respect to the reference position. When the average displacement Xt exceeds a predetermined value, the winding diameter R of the packaging film reel 2 is recalculated according to the equation (6).
R = Ro × Lf / (Lf−Xt × Tk) (6)
Ro: Roll diameter before recalculation
[0046]
Next, the control operation of the above-described packaging material feeding device will be described more specifically with reference to the flowcharts of FIGS.
FIG. 3 is a flowchart showing the initial setting operation of the controller.
In the initial setting operation, the controller 20 first detects the current position X of the tension lever 8 based on the detection signal from the position detection rotary encoder 16. ₁ (S1), it is determined whether the tension lever 8 is in a position that is swung clockwise (FIG. 1) from the center position of the swingable range (S2). For example, the reel drive motor 4 is rotated forward by ½ rotation (S3). On the other hand, if it is at a position that has been swung counterclockwise, the reel drive motor 4 is reversely rotated by ½ rotation (S4).
[0047]
And the position X of the tension lever 8 after rotation ₂ (S5), and the displacement of the tension lever 8 before and after the rotation (X ₂ -X ₁ ) Is confirmed to be zero (S6), and if it is not zero, the winding diameter R of the packaging film reel 2 is calculated by the above-described equations (3) and (4) (S7). Displacement amount of tension lever 8 (X ₂ -X ₁ ) Is zero, it is expected that there is a problem with the setting of the packaging film 1 and the like, so an error signal is output (S8) to inform the operator to that effect.
[0048]
Furthermore, it is confirmed whether or not the calculated winding diameter R of the packaging film reel 2 is within a preset allowable range (S9). When the calculated winding diameter R of the packaging film reel 2 exceeds the allowable range, it is expected that the above-described calculation processing has malfunctioned. In this case also, an error signal is output (S10), and the operator is notified of the error. Inform the effect.
[0049]
If the calculated winding diameter R of the packaging film reel 2 is within the preset allowable range, the operation of swinging the tension lever 8 to the starting position (reference position) is subsequently executed.
[0050]
In order to swing the tension lever 8 to the starting position (reference position), the current position X of the tension lever 8 using the above-described equation (2). ₂ The amount of the packaging film 1 that is required to be displaced from the reference position Xo to the reference position Xo (corresponding to Lt) is calculated (S11), and the rotation amount of the reel drive motor 4 is calculated from the equation (1) (S12).
Here, the expression (2) includes a current position X of the tension lever 8 instead of X in the expression. ₂ Is assigned.
[0051]
In this way, after calculating the amount of rotation of the reel drive motor 4 required to swing the tension lever 8 to the starting position (reference position), the motor is rotated forward or reverse by the calculated amount of rotation. At this time, the current position of the tension lever 8 is confirmed in advance (S13). If the tension lever 8 is in a position swung clockwise (FIG. 1) from the reference position, the reel drive motor 4 is rotated forward (S14). If it is at a position that is swung counterclockwise (FIG. 1) from the reference position, the reel drive motor 4 is reversely rotated (S15).
[0052]
Finally, the current position of the tension lever 8 is read (S16), whether it is within the allowable range centered on the reference position (S17), and if it is confirmed that it is within the allowable range, the initial setting is made. The operation is terminated (S18). On the other hand, when the tension lever 8 is not located within the allowable range, it is expected that there has been a malfunction in the movement process to the reference position described above, so an error signal is output (S19), and the operator is notified accordingly. To inform.
[0053]
After the above initial setting is completed, the controller 20 detects the rotation speed of the feeding roller 5 in accordance with the start timing of the feeding roller 5, and controls the rotation amount of the reel drive motor 4 based on the above-described equation (5). At the same time, the packaging material feeding device is operated while correcting the rotation amount of the motor 4 every predetermined cycle.
[0054]
FIG. 4 is a flowchart showing the rotation amount correction operation of the reel drive motor by the controller.
When the reel drive motor 4 starts to rotate in proportion to the rotation speed of the feeding roller 5, the controller 20 reads the position of the tension lever 8 (S23) in accordance with a predetermined reading timing of the lever position (S22).
[0055]
Then, it is confirmed whether or not the read position of the tension lever 8 is within an allowable range centered on a preset reference position. If it is within the allowable range, the packaging film 1 in the next cycle is checked. Is set at the current delivery amount (S25), and the rotation amount of the reel drive motor 4 is calculated based on the equation (1) (S27).
[0056]
On the other hand, when the read position of the tension lever 8 is out of the allowable range centered on the preset reference position, the tension lever 8 is returned from the current position to the reference position based on the equation (2). A necessary amount of the packaging film 1 is calculated (S26), and the amount of rotation of the reel drive motor 4 is calculated based on the equation (1) based on the calculated amount of the packaging film delivered (S27).
After calculating the amount of rotation of the reel drive motor 4, a control signal is output to the reel drive motor 4 to rotate the next cycle by the amount of rotation (S28).
[0057]
Subsequently, the controller 20 calculates an average displacement of the tension lever 8 with respect to the reference position in accordance with a predetermined recalculation timing of the winding diameter R (S29). When this average displacement exceeds a predetermined value (S31), the winding diameter R of the packaging film reel 2 is recalculated according to the equation (6) (S32), and the value of the winding diameter R is rewritten.
[0058]
FIG. 5 is a block diagram showing the overall structure of a packaging material feeding device according to another embodiment of the present invention. In FIG. 5, the same or corresponding parts as those shown in FIG. 1 described above are denoted by the same reference numerals, and detailed description thereof is omitted.
[0059]
The packaging material feeding device shown in FIG. 1 has an opening tape (wrapping material) fed from an opening tape reel (packaging material reel) 31 to a packaging film (wrapping material) 1 fed from a packaging film reel 2 (packaging material reel). After the material 30 is fused by the heater unit 32, it is guided to the feeding roller 5.
[0060]
The packaging film 1 fed out from the packaging film reel 2 is wound around the tension roller 7 and pulled with a constant tension by the urging force acting on the tension lever 8 in the same manner as the above-described embodiment, thereby preventing the loosening. ing.
On the other hand, a tension unit 33 is also provided between the opening tape reel 31 and the feeding roller 5, and the opening tape 30 fed from the opening tape reel 31 is wound around the tension roller 34 as the reel drive motor 38 rotates. It is hung and pulled with a constant tension by the urging force acting on the tension lever 35 to prevent loosening.
[0061]
A position detection rotary encoder (position detection means) 37 is also provided on the support shaft 36 of the tension lever 35 that applies tension to the opening tape reel 30.
[0062]
6 is a block diagram showing a control system of each reel drive motor in the packaging material feeding apparatus shown in FIG.
As shown in the figure, the amount of rotation of each reel drive motor 4, 38 is automatically controlled by controllers (reel drive motor control means) 20, 40. These controllers 20 and 40 receive detection signals from the rotation detection rotary encoder 15 as in the above-described embodiment, and control the rotation amounts of the reel drive motors 4 and 38 based on the detection signals. are doing.
[0063]
Furthermore, the controllers 20 and 40 respectively input detection signals from the position detection rotary encoders 16 and 37 every predetermined cycle, read the swing angles of the tension levers 8 and 35 from the detection signals, and perform the swings. Based on the angle, the rotation amounts of the packaging film reel 2 and the opening tape reel 31 in a predetermined cycle are corrected. In addition, each of the controllers 20 and 40 performs an initial setting operation similar to the controller 20 in the previous embodiment and a recalculation operation of the winding diameter R. Since the functions of these controllers 20 and 40 are the same as those of the controller 20 in the previous embodiment, a detailed description thereof is omitted here.
[0064]
Thus, since the tension of the packaging film 1 and the opening tape 30 can be kept substantially constant by controlling the rotation amount of each reel drive motor 4, 38 by the controllers 20, 40, the opening tape is applied to the packaging film 1. When the 30 is fused, the generation of wrinkles due to the tension difference between the packaging materials can be prevented.
[0065]
5, the reel driving motors 4 and 38 of the packaging film 1 and the opening tape 30 can be controlled by a single controller 50 as shown in FIG. is there.
[0066]
【The invention's effect】
As described above, according to the present invention, since the rotation amount of the reel drive motor is controlled based on the rotation amount of the feeding roller, the packaging material by the feeding roller regardless of the operation content of the feeding roller. The packaging material can be sent out from the packaging material reel in accordance with the amount of feeding.
Furthermore, the position of the tension member that applies tension to the packaging material is detected, and the amount of rotation of the reel drive motor is corrected so that the position of the tension member is corrected to a predetermined reference position. An appropriate amount of packaging material can be delivered from the packaging material reel.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an overall structure of a packaging material feeding device according to an embodiment of the present invention.
2 is a block diagram showing a control system of the reel drive motor in FIG. 1. FIG.
FIG. 3 is a flowchart showing an initial setting operation of the controller shown in FIG. 2;
4 is a flowchart showing a rotation amount correction operation of the reel drive motor by the controller shown in FIG. 2;
FIG. 5 is a configuration diagram showing a packaging material feeding device according to another embodiment of the present invention.
6 is a block diagram showing a control system of the reel drive motor in FIG. 5. FIG.
7 is a block diagram showing another control system of the reel drive motor in FIG. 5. FIG.
FIG. 8 is a block diagram showing a conventional packaging material feeding device.
[Explanation of symbols]
1: Packaging film 2: Packaging film reel
3: Rotation drive shaft 4: Reel drive motor
5: Feeding roller 6: Tension unit
7: Tension roller 8: Tension lever
12: Feeding motor
15: Rotary encoder for rotation detection
16: Rotary encoder for position detection
20: Controller

Claims (3)

A packaging material reel that winds the packaging material, a reel drive motor that rotationally drives the packaging material reel, a feeding roller that feeds the packaging material fed from the packaging material reel to a packaging work position, and a rotational drive for the feeding roller A packaging material feeding device including a feeding motor,
Detecting the amount of rotation of the feeding roller and controlling the amount of rotation of the reel drive motor based on the amount of rotation of the feeding roller;
Further, the packaging material fed from the packaging material reel is wound around a tension member that is movable in a predetermined direction and biased in one direction, and is applied to the feeding roller while applying a certain tension by the tension member. While guiding the packaging material,
Detecting the position of the tension member;
Based on the detected position of the tension member, the amount of rotation of the reel drive motor in a predetermined cycle is corrected according to the following equation, and the position of the tension member is corrected to a predetermined reference position. .
V = (Lf−Lt) / 2πR
Lt = (X−Xo) × Tk
here,
V: Rotation amount of the reel drive motor in a predetermined cycle after correction
Lf: the feeding amount of the packaging material of the feeding roller in a predetermined cycle
X: Current position of detected tension member
Xo: Reference position of tension member
Tk: a coefficient for converting the amount of displacement of the tension member with respect to the reference position into the amount of packaging material delivered from the packaging material reel
Lt: the amount of packaging material delivered from the packaging material reel required to return the tension member from the detected position to the reference position
R: Packaging material winding diameter (radius) of packaging material reel In the packaging material feeding method according to claim 1 ,
With the feeding roller stopped, the packaging material reel is rotated by a predetermined amount, the displacement amount of the tension member corresponding to the rotation amount of the packaging material reel is detected, and the packaging material is detected from the detected displacement amount. The amount of packaging material delivered or wound by rotation of the reel is calculated, and the packaging material reel diameter R of the packaging material reel is calculated based on the amount of packaging material delivered or wound and the amount of rotation of the packaging material reel. A packaging material feeding method characterized by the above. In the packaging material feeding method according to claim 1 or 2 ,
When the average displacement of the tension member over the predetermined cycle with respect to the reference position exceeds a predetermined value, the packaging material winding diameter R of the packaging material reel is recalculated based on the average displacement of the tension member. A packaging material feeding method.

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