JPH09295618A - Wrapping machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrapping machine which enables a user to know the amount of the remainder of an original roll being used, (remaining time and the like). SOLUTION: A fourth drive motor 40 is connected to an original roll 15, a bandlike film 16 is fed out by rotating the original roll in a specific direction, and it is led to a bag-making machine 18. In the case, a second distance- measuring device 53 for measuring the length of the arc of the original roll is attached to the rotary shaft 43 of the original roll, and a first distance- measuring device 51, which is movable, is provided in a particular part of the place where the bandlike film is drawn out. The fourth drive motor is rotated for a fixed length of time, the arc length and movement distance of the rotary shaft at the time are measured by the corresponding measuring devices, they are sent to a roll-diameter calculation part 55, and a roll diameter R is found from both the data and the diameter of the rotary shaft. In a remainder calculation part 48, the number of the turns of the original roll is found from the roll diameter and a film thickness, a film length is found from it, further, remaining time is obtained from the film length and the speed of the movement of the bandlike film, and it is shown on a display device 49.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a packaging machine.

[0002]

2. Description of the Related Art Conventionally, in a packaging machine such as a horizontal pillow packaging machine, for example, as shown in FIG. 7, a continuous roll-shaped film 2 is drawn out from a roll 1 wound into a bag-making device 3. It is supplied and formed into a cylindrical film 4 there. On the other hand, a package supply device 5 is installed on the carry-in side of the bag making device 3, conveys the package 6 at predetermined intervals, and sequentially supplies it into the tubular film 4. Then, the article to be packaged 6 is sequentially conveyed while being contained in the tubular film 4, the film seal end of the tubular film 4 is sealed by the center sealer 7 during the transportation, and further the end sealer 8 is used. Each package 6 of the tubular film 4 is laterally sealed and cut to manufacture the package 9.

The original roll 1 to the strip film 2
Is fed by using a feed roller 10 provided with a pair of rollers for sandwiching the drawn strip film 2 from both sides thereof. That is, one roller 10a constituting the feed roller 10 is connected to the drive motor 11,
The other roller 10b is brought into a free state. This allows
When the drive motor 11 rotates at a constant speed, one roller 10a
Since it also rotates at a constant speed, the strip film 2 is pulled out at a constant speed. Following this, the original roll 1 is also indirectly given a rotational force, allowing the withdrawal of the strip film.

For the drive control of the above-mentioned respective parts, for example, the system shown in Japanese Patent Laid-Open No. 63-281911 is used.
That is, the other two drive systems (the drive system of the package feeding device 5 and the drive system of the end sealer 8) are controlled with the drive motor 11 for pulling out the strip film 2 as a reference. More specifically, the reference band-shaped film 2 is pulled out at a constant speed as described above, and the interval between the cut marks formed on the band-shaped film 2 is detected to be different from the predetermined interval (cut mark pitch). In this case, the speed of the package supply device 5 (conveyance speed of the package), the rotation speed of the end sealer 8 and the meshing timing are increased / decreased so that the motors that are the drive sources of all drive systems are synchronized. There is. In this way, the moving speed of the strip-shaped film 2 serves as a reference for drive control of the entire packaging device, so that if the moving speed fluctuates, it cannot operate normally. Therefore, it is necessary to pull out the strip film at a constant speed as described above.

By the way, when the strip-shaped film 2 is sandwiched and pulled out by the feed roller 10 as described above, the original roll 1 rotates following the pull-out of the strip-shaped film 2, so that a constant inertial force is applied. Is occurring. Then, if there is a difference between the rotation speed due to the inertial force and the drawing speed of the original roll 2, the band-shaped film 2 may be loosened. When the band-shaped film is loosened in this way, the band-shaped film 2 meanders when passing through the bag-manufacturing device 3 of the packaging apparatus to form a bag, for example, and the center seal portion is not formed at a desired position. As a result, the final package may be defective.

Therefore, the original roll 1 is provided with a braking device for braking this rotation, and the rotation of the original roll 1 is braked so that tension is applied to the strip film 2 to prevent the occurrence of the slack. I have to.

[0007]

By the way, as a matter of course, when one original fabric roll 1 is completely pulled out, the next original fabric roll 1 needs to be mounted. However, in the conventional packaging machine, since it is not possible to know the remaining time required for pulling out all the raw fabric rolls 1 in use, when the roll diameter of the raw fabric roll 1 becomes small, the raw fabric rolls are replaced. The person who waits until all the original rolls in use in front of the apparatus are exhausted, and then the replacement process is performed. Therefore, other work cannot be done while waiting, which is inefficient.

In addition, a spare original fabric roll is usually prepared on the side of the packaging machine so that the original fabric rolls mounted on the packaging machine can be immediately exchanged when all the original fabric rolls are pulled out. Therefore, if you do not know the remaining time as described above, when the packaging machine is operated until a certain time such as the end of work time, the currently mounted original fabric roll and / or the already-prepared original fabric roll is sufficient. It becomes unclear whether or not. Therefore, it is necessary to prepare a spare roll of roll for safety, but when it is not used in the end,
Considering that the original rolls brought in are wasted and the labor required to move the original rolls is lost, and that originally, other work could be done during the movement of the original rolls. , Double loss.

Similarly, since the number of packages that can be manufactured by the currently used original rolls is unknown, for example, is it possible to use the currently used original rolls to achieve a certain production target number? Or I didn't know if I needed to bring a spare roll. Therefore, in consideration of safety as well, a large number of spare original rolls are prepared, which causes the same problem as described above.

On the other hand, since the total length of the unused original fabric roll is known, the number of products manufactured per unit time and the cut size (the length of the film used to manufacture one package)
Is determined, the time required to finish using one original roll and the number of manufactured sheets are obtained. Therefore, when the packaging machine is in continuous operation, it is possible to estimate the approximate remaining time by measuring the time from the start of operation. However, the unused original fabric roll is not always attached, and the original fabric roll that has already been used by a predetermined amount may be attached. Therefore, in such a case, the same problem as above also occurs.

The present invention has been made in view of the above background, and its object is to solve the above problems and to know the remaining amount of the original roll, the remaining time and the manufacturing (packaging). ) It is to provide a packaging machine that can obtain the number of possible pieces and the like and that has good work efficiency.

[0012]

In order to achieve the above-mentioned object, in a packaging machine according to the present invention, a belt-shaped film continuously fed from an original roll is used to convey an object to be conveyed at predetermined intervals. While wrapping a package, in a packaging machine that manufactures a package by sealing and / or cutting a predetermined portion of the film, a roll diameter detecting unit that detects the roll diameter of the original roll, and the roll diameter detecting unit detects the roll diameter. The remaining amount calculation means for obtaining the remaining amount of the strip-shaped film wound on the original roll based on the roll diameter, and an output device for outputting the calculation result by the remaining amount calculation means (claim Item 1).

The remaining amount may be, for example, the film length (Claim 2), the remaining time (Claim 3), or the remaining number of products manufactured (Claim 4). Further, as the roll diameter detecting means, for example, a first distance measuring device that directly or indirectly measures the moving distance of the strip-shaped film sent by the rotation of the original roll, and the first roll measuring device rotates in synchronization with the original roll. A second distance measuring device that directly or indirectly measures the arc length of the rotating body, and moving distance data and arc length data respectively measured by the first and second distance measuring devices, and
A roll diameter calculating unit for calculating the original roll diameter based on the output can be provided (claim 5).

Further, as a concrete constitution of the packaging machine, for example, a drive motor capable of controlling acceleration and deceleration for applying a rotational force to a rotary shaft on which the original roll is mounted, and a strip-shaped film fed from the original roll. A control means for controlling the drive motor so that the moving speed becomes a predetermined speed may be provided (claim 6).

Here, the roll diameter is indicated by the diameter in the embodiment, but is a concept including the radius. Further, although the output device is the display device in the embodiment, the present invention is not limited to this, and may be a printing device such as a printer,
Alternatively, it may be by voice. Further, even if it is not integrated with the packaging machine, it may be a device that transfers data to various output devices at other remote places by wireless or wire, and its form is not limited. Further, in the case of such transfer, it is not always necessary to include the display device or the like of the transfer destination,
Only the device that transfers predetermined data is included in the output device in the present invention.

[0016] Also, as a packaging machine according to the present invention, compact and highly accurate control can be performed, but the present invention is not necessarily limited to this, and is generally performed conventionally as shown in FIG. 7, for example. It may be a type in which various types of brake devices are mounted.

The roll diameter of the original roll is determined at a certain timing during use. And from the roll diameter to the film length,
Data regarding the remaining time of the film such as the remaining time that can be operated by the original roll (the time until all the band-shaped films are delivered from the original roll) and the number of films that can be manufactured is obtained. Then, the obtained result is output to the output device.

With this, the user can know the information about the remaining amount of the raw fabric roll being used, and therefore, even if the roll diameter of the raw fabric roll becomes small, the user is waiting by the packaging machine, You no longer need to bring extra rolls of rolls. Therefore, productivity is improved.

In the embodiment, the film length is obtained by obtaining the number of turns of the original roll from the film thickness, but the specific calculation algorithm is not limited to this.
Further, in the embodiment, the length of the film forming the original roll and the remaining time / manufacturing number based on the film length are obtained, but in reality, it is already sent from the original roll,
The film exists for the distance to the end seal device of the packaging machine. Therefore, in order to obtain the remaining amount more accurately, the respective values obtained in the embodiment are corrected / corrected based on the already sent amount. The present invention includes both cases where such correction is performed and cases where such correction is not performed.

On the other hand, in the roll diameter detecting means as defined in claim 5, the first distance measuring device measures the total moving distance of the strip-shaped film when the strip-shaped film is being fed by rotating the original roll. The second distance measuring device measures the length of an arc having the center of rotation of the rotating body.

The moving distance measured by the first distance measuring device is equal to the length of the arc of the fan whose radius is the radius of the original roll, with the rotation angle rotated at that time as the central angle. The length of the arc of the rotating body rotated at this time is detected by the second distance measuring device. Furthermore, the diameter (diameter) of the rotating body is known and constant.

Therefore, if the rotation angle of the rotator and the rotation angle of the original roll are equal, the ratio of the arc length to the diameter of the rotator,
Arc length of original roll (length of film sent out)
Since the ratio of the diameter of the original roll is equal to that of the original roll, a predetermined four arithmetic operation is performed using these three data to calculate the diameter of the original roll.

Further, according to the wrapping machine defined in claim 6, the feeding speed of the belt-shaped film is controlled so as to follow it by accelerating and decelerating the drive motor associated with the original roll. Therefore, the control means increases the rotation speed of the drive motor in response to the decrease in the winding diameter of the original roll, so that the strip-shaped film is fed at a constant speed. Further, since the rotation of the material roll follows the rotation of the drive motor in this way, when the drive motor is decelerated or stopped, the rotation of the material roll is also decelerated / stopped according to the change, Since it does not continue to rotate due to inertial force, the conventional braking device becomes unnecessary. Then, the strip-shaped film delivered as described above is supplied to a predetermined position of the packaging machine at a predetermined speed by the supply means and used as a packaging film.

[0024]

1 shows an example of an embodiment of a packaging device according to the present invention. As shown in the figure, the strip-shaped film 16 wound around the original fabric roll 15 is stretched over a plurality of pulleys (fixed pulley, tension pulley, etc.) 17 and guided to a bag making device 18 below, where it is manufactured. By passing through the bag device 18, a tubular film 19 is formed.
Is formed.

On the carrying-in side (upstream side) of the bag-making device 18, the object to be packaged 20 is placed in the bag-making device 18, that is, in the tubular film 19.
An article-supplying device 22 for sequentially supplying the items is installed. The package supply device 22 is configured by attaching pushing fingers 26 to the endless chain 25 provided between a pair of drive sprocket 23 and driven sprocket 24 at regular intervals, and is linked to the drive sprocket 23. Further, it receives rotational force from the first drive motor 27 and is rotationally driven. And this first
The drive motor 27 is composed of, for example, a motor such as a servo motor capable of controlling the rotation speed so as to freely increase and decrease the rotation speed.

An auxiliary roller 28, a center sealer 29, and an end sealer 30 are arranged at predetermined positions on the unloading side (downstream side) of the bag making machine 18, and a unloading conveyor 32 is installed further downstream of the end sealer 30. Has been done.

The auxiliary roller 28 is a tubular film 19
Is composed of a pair of rollers for sandwiching the overlapping end portions of the strip-shaped film 16 from both sides thereof, and has a speed slightly higher than the moving speed of the strip-shaped film 16 delivered by the material delivery device according to the present invention described later with respect to the tubular film 19. A conveying force is applied and a constant tension is applied to the strip film 16 to prevent the film from loosening.

The center sealer 29 is composed of a pair of flat rotating rollers (at least one of which is heated). The rotating ends of the cylindrical film 19 are sandwiched by both rotating rollers and heated to heat the overlapping ends. It is designed to be heat-sealed. The rotation speed of the center sealer 29 is also slightly higher than the moving speed of the strip film 16.

The auxiliary roller 28 and the center sealer 29 are connected to the second drive motor 33 so that they rotate synchronously at the same speed. The second drive motor 33 is connected to the speed control device 38 together with the first drive motor 27, and the speed thereof is controlled. The second drive motor 33 may also be configured by a motor such as a servo motor capable of increasing or decreasing speed in order to have versatility, but when it is not necessary to change the rotation speed during the operation of the packaging device, You may comprise with a normal motor.

Further, in the end sealer 30, top sealers 30b are attached to rotating shafts 30a which are vertically opposed to each other, and both rotate in synchronization with each other so that each top sealer 30b rotates the tubular film 19 with each other. It is designed to be caught and struck. Further, a heater and / or a cutter are built in the predetermined top sealer 30b. As a result, when the top sealers 30b come into contact with each other, a predetermined portion of the tubular film 19 is heated and fused, and is cut by a cutter to manufacture the package 34. Then, the package 34 is carried out by the carry-out conveyor 32. In addition, this end sealer 30
Is also rotatably driven by a third drive motor 35 associated with one rotation shaft 30a.
The drive motor 35 is also composed of a motor such as a servo motor capable of controlling acceleration and deceleration.

Further, a fourth drive motor 40 is associated with the original roll 15 so as to directly apply a rotational force in a predetermined direction to the original roll 15 so that the belt-shaped film 16 is delivered at a predetermined speed. There is. That is, as shown in FIG. 2, since the original roll 15 is configured by winding the strip film 16 around the paper tube 41 many times, the paper tube 41 is cantilevered by the bearing 42. The rotary shaft 43, which is a rotary body, is inserted and fixed to be integrated with the rotary shaft 43. Then, the original roll 15 is sandwiched and fixed from both sides by a stopper 44 provided on the rotating shaft 43.

The sprocket 4 is attached to one end of the rotary shaft 43.
5 is fixed, and the rotational force of the fourth drive motor 40 is transmitted to the rotary shaft 43 via the power transmission chain 46 that is wound around the sprocket 45. As a result, when the fourth drive motor 40 rotates, the rotation shaft 43 and thus the original roll 15 rotate. And
The fourth drive motor 40 is the same as the speed control device 3 described above.
It is adapted to be rotationally driven based on a control signal from 8.

The fourth drive motor 40 and the rotary shaft 43
Does not have to be connected via the power transmission chain as described above, but the output shaft of the drive motor may be directly connected to the rotary shaft or connected via a gear or the like.

With the above construction, when the fourth drive motor 40 is rotated, the rotary shaft 43 and thus the original roll 15 are rotated at a predetermined speed, so that the strip-shaped film 16 is continuously fed. Since the fourth drive motor 40 and the original roll 15 are interlocked,
When the fourth drive motor 40 accelerates and decelerates, the original roll 15
The rotation speed of is also increased or decreased.

Therefore, it is rotationally driven at a certain speed (high speed rotation).
Even if the fourth drive motor 40 is suddenly stopped or decelerated during the rotation, the original roll 15 does not continue to rotate at a high speed due to the inertial force as in the conventional case, and it is stopped or Slow down. As a result, the fourth drive motor 40 also exhibits the function of the braking device, so that a large-sized braking device as in the related art is unnecessary. Further, by accurately controlling the rotation speed of the fourth drive motor 40,
The rotation speed of the original roll 15 can be controlled, and the fourth drive motor 4 relating to the feeding speed of the strip film 16 can be controlled.
It can be adjusted by controlling 0. The belt-shaped film 16 thus fed is supplied to the packaging machine at a predetermined speed by the pulling force from the auxiliary roller 28 and the center sealer 29 which are rotationally driven by the second drive motor 33. .

By the way, with the above structure, the original roll 15
The belt-shaped film 16 is continuously fed by directly applying a rotational force to the roll, but the diameter of the raw roll of the raw roll 15 is gradually reduced with the feeding. Therefore, if the rotation speed of the fourth drive motor 40 is kept constant, the delivery speed of the strip-shaped film 16 gradually decreases, and the strip-shaped film 1 serving as a reference for drive control of each part of the horizontal pillow packaging device.
The movement speed of 6 does not become constant. Therefore, in order to feed the band-shaped film 16 to the bag-making device 18 (packaging device) side at a constant speed, it is necessary to increase the rotation speed as the diameter of the original roll becomes smaller. Therefore, the speed control device 38 controls to gradually increase the rotation speed.

As a specific control, when the strip-shaped film is moved and supplied at a predetermined speed, the original roll diameter gradually decreases at a constant rate (the strip-shaped film is wrapped at a constant speed. Since it is supplied to the machine side, the degree of decrease of the roll diameter is required depending on the elapsed time from the start of work), and a map of the speed with the elapsed time from the start of work that is predetermined according to the degree of decrease It is possible to perform control such that a table is created and the speed of the fourth drive motor is increased by referring to such a map.

If the feeding speed of the strip-shaped film due to the rotation of the original roll 15 is equal to the drawing-out speed of the strip-shaped film accompanying the withdrawal of the auxiliary roller 28, the second,
The fourth drive motors 33 and 40 are not so heavily loaded, and a desired rotation speed can be obtained only by supplying a predetermined current. However, if both speeds change, one of the drive motors (the rotation speed is slow). However, since the other drive motor applies a load / braking force to the other drive motor, it is necessary to supply a current higher than the normal supply current in order to rotate the other drive motor at a predetermined speed. On the other hand, on the other hand, when one drive motor side supplies a predetermined current, the other drive motor applies a rotational force, so that the drive motor rotates at a speed equal to or higher than the normally obtained rotation speed. Therefore, the change of the current (deviation from the target value (normal value)) and the change of the rotation speed (deviation from the target value (normal value)) are monitored, and they are 0 (the above-mentioned withdrawal speed and delivery speed). Can be made equal) or can be feedback-controlled to each drive motor so as to be a predetermined value (a constant difference is made between the drawing speed and the sending speed). Further, the moving speed and moving distance of the strip-shaped film may be monitored, and feedback control may be performed for each drive motor so that the moving speed and moving distance match the target value, and various control methods can be adopted.

The speed control for the above-mentioned first and third drive motors is also performed by this speed control device 38, but since such control is conventionally known, the processing flow will be concretely omitted.

Here, in the present invention, the original roll 1 in use
A device for determining the film length of 5 and outputting it was provided.
Specifically, a roll diameter detection device for calculating the roll diameter,
A remaining amount calculation unit 48 that obtains a predetermined remaining amount such as a film length based on the roll diameter obtained by the roll diameter detection device, and a CRT that outputs the remaining amount data obtained by the remaining amount calculation unit 48 , Display devices 4 such as liquid crystal displays
9 and 9.

First, the original roll diameter detecting device measures a first distance measuring device 51 for measuring the moving distance of the strip-shaped film 16 which has been fed out, and a first distance measuring device 51 for measuring the arc length of the peripheral edge of the rotating shaft 43 which is a rotating body. 2 distance measuring device 53, each measuring device 51,
The roll diameter calculator 55 calculates the roll diameter from the output of 53. The roll diameter calculation unit 55, the speed control device 38, and the remaining amount calculation unit 4 are actually used.
Since 8 is executed by the CPU, it is incorporated in the same device.

As shown in FIG. 2, the second distance measuring device 53 has magnetic materials 56 arranged at equal intervals in the circumferential direction on the outer peripheral surface of the rotary shaft 43, and a minute gap between the magnetic materials 56. And a magnetic force sensor 57 arranged opposite to each other. The magnetic force sensor 57 is supported by a fixed system such as a machine frame, and a detection signal is output every time the magnetic material 56 passes in front of the magnetic force sensor 57. Therefore, a pulse signal is output from the second distance measuring device 53 (magnetic force sensor 57) in accordance with the rotation of the rotary shaft 43 (raw roll 15), and the pulse signal is given to the roll diameter calculation unit 55. Since the arrangement interval of the magnetic materials 56 is known, when the arc length between the adjacent magnetic materials 56 is t0 and the output pulse number is n, when the strip film 16 is fed by a predetermined length, The arc length t of the fan of the rotary shaft 43 having the rotated angle as the central angle can be calculated by t = n × t0 (1).

Further, as shown in FIG. 3, the first distance measuring device 51 has a wide receiving roller 51a and a narrow rotating roller 51b which are arranged opposite to each other with the strip film 16 interposed therebetween.
And an encoder 51c attached to the rotating roller 51b. Then, the receiving roller 51a
Is wider than the width of the strip-shaped film 16 so as to come into contact with the entire surface thereof, and is rotatably supported by a bearing (not shown) in a free state. on the other hand,
The rotating roller 51b is biased toward the receiving roller 51a,
After all, it is rotatably supported by a bearing (not shown) in a free state.

As a result, the receiving roller 51a and the rotating roller 51b are pressed against the strip-shaped film 16 at a predetermined pressure, and the receiving roller 51a and the rotating roller 51b rotate as the strip-shaped film 16 moves.

Since the encoder 51c is attached to the rotary shaft of the rotary roller 51b, the rotary roller 5b
A pulse signal is output from the encoder 51c with the rotation of 1b. The circumference of the rotary roller 51b is known, and the moving distance of the strip film 16 and the rotary roller 51b are known.
Since the moving distance of the circumferential surface of b is the same, the rotation roller 5
The moving distance (reference moving distance T0) of the strip film when 1b is rotated by a unit angle (angle between adjacent pulses) is uniquely determined. Therefore, if the number of pulses N is counted by counting the pulses output from the encoder (one pulse is output for each unit angle), the moving distance T at that time is calculated.
Is calculated by T = N × T0 (2)

Then, the roll diameter calculation unit 55 performs the calculation processing of the following equation (3) from the moving distance T and the arc length t given per unit time, and the original roll diameter R at the start.
Ask for. R = T * r / t (3) where r is the diameter of the rotary shaft 43. That is, as shown in FIG. 4, the rotary shaft 43 and the original roll 15 both have circular cross sections, and therefore have the same central angle. Since the fan shapes are similar to each other, the ratio between the radius and the arc length t, T of both fan shapes is equal. Therefore, the ratio of the lengths of the arcs having the same angle as the diameters r and R as the central angle is also equal. Since the rotary shaft 43 and the original roll 15 are coaxially arranged and integrated, the rotation angles of both are the same. Therefore,
The following proportional expression is obtained.

R: T = r: t (4) Therefore, by solving the above equation (4) for R, the above equation (3) is obtained. The length of the arc of the original roll 15 is the same as the distance T of the drawn strip film 16 measured by the first distance measuring device 51, and the rotation axis 4
The diameter r of 3 is known in advance and is constant. Therefore, both distance measuring devices 51, 5 are added to T and t in the above equation (3).
By substituting the distance measured in 3, the diameter R of the original fabric roll 15 at the time of measurement is obtained. Then, the calculated diameter R is given to the remaining amount calculation unit 48.

In the present example, the remaining amount calculating section 48 obtains the remaining film length from the given diameter R, and the remaining time from the film length until all the films are pulled out from the original roll 15 and It is possible to obtain the number of products that can be manufactured thereafter by using the original roll 15 being used.

That is, the remaining amount calculation unit 48 is executed according to the flowchart shown in FIG. 5, and first obtains the current roll diameter (diameter) R of the original fabric roll given from the roll calculation unit 55 (ST1).

Then, the remaining film length is obtained based on the acquired data R (ST2). Specifically, first, the following equation (5) is executed to obtain the winding number M. However, d is the film thickness of the film forming the original roll 15 in use, and is given to the remaining amount calculation unit 48 as an initial value in advance.

M = ((R-r) / 2) / d (5) On the other hand, the film diameter of the innermost circumference (first round) is the same as the diameter r of the paper tube 43, and at the first round. The length of the film wound up is πr. The film diameter on the second lap is 1
This is (r + 2d), which is obtained by adding twice the film thickness d to the film diameter r on the circumference, and the length of the film wound on the second circumference is π (r + 2d). Similarly, the film diameter on the third lap is (r + 2.2d),
The length of the film wound on the third lap is π (r +
2.2d). Therefore, the film diameter at the mth round is (r
+ (M−1) · 2d), and the length of the film wound on the third turn is π (r + (m−1) · 2d).

Therefore, the film length L constituting the roll diameter R of the number of windings M can be obtained by obtaining the total length of the films from the first lap to the M-thickness each time, and the sum is calculated by the following formula. To be

[0053] Therefore, in step 2, after the above equation (5) is executed, the equation (6) is arithmetically processed and the obtained film length L is stored.

Next, it is judged whether or not the information desired by the user is the remaining time. If the command given by the user is the remaining time, the process jumps to step 4, and from the film length L obtained in step 2, The remaining time is obtained and the calculation result is output to the display device (ST4, ST5).

At this time, the remaining time calculation processing is as follows. That is, the speed control device 38 controls each motor so that the moving speed of the belt-shaped film 16 pulled out from the original roll 15 becomes the target moving speed V. Therefore, after this, it is assumed that the strip film 16 is pulled out at the target moving speed V, and is calculated by executing the following formula (7).

Remaining time = L / V (7) On the other hand, after executing the process of step 5 above, or if the branch determination of step 3 is N, jump to step 6 and the information desired by the user is the original information. It is judged whether or not the number of products that can be manufactured by the anti-roll is the manufacturing number, and if the command given by the user is the number of products to be manufactured, the process jumps to step 7,
The number of products to be manufactured is obtained from the film length L obtained in step S6, and the calculation result is output to the display device (ST7, ST8).

At this time, the manufacturing number calculation process is as follows. That is, the cut size of the packaging machine currently in operation (the length L0 of the film required to manufacture one packaging body) is set as initial data at the start of operation of the packaging machine. It is determined by substituting the set value L0 and the film length L obtained in step 2 into the following equation (8).

The number of products manufactured = L / L0 Then, after the process of step 8 is executed, or when the branch determination of step 6 is N, the process returns to step 1 to prepare for the next process.

In the above-described embodiment, the remaining time and the remaining number of products to be manufactured can be obtained, and each value can be selectively executed based on the instruction from the user. The present invention is not limited to this, and for example, both may be calculated and output together, instead of being selected and displayed according to an instruction from the user. Further, although the calculation processing is performed by both of them, various modifications can be made such that only the output display may be performed according to a command from the user. Furthermore, it is possible that only one of the remaining time and the number of products manufactured can be obtained.

Furthermore, the remaining film length obtained in step 2 may be output / displayed. In that case, only the film length may be calculated and output, or it may be possible to output and display together with other information or selectively with them, as in the above-described embodiment and each modification. Good.

Further, the above-mentioned information acquisition from the sensor and each calculation may be performed at regular intervals, or may be performed after waiting for a command from the user. good. In the case where the arithmetic processing is always performed, the arithmetic result may be displayed and output at all times, or the arithmetic result may be constantly rewritten and stored and output to the display device 49 by the user. It is also possible to wait for a command or request from the system, and various methods can be adopted.

Further, in the present embodiment, among the diameters obtained by the roll diameter calculating section 55, the diameter R0 obtained at the start of operation of the packaging machine is transferred to the speed control device 38. Then, in the speed control device 38, the given original fabric roll diameter data R0 is initialized as the original fabric roll diameter at the start of operation, and the strip-shaped film 16 is based on the roll diameter.
The rotation speed of the original roll 15 is determined so that the moving speed of the roll becomes the target speed, and the fourth drive motor 40
The rotational speed of is calculated, and rotation is performed at the calculated speed. As a result, the strip film can be supplied to the packaging machine in a stable state with a small error immediately after the start of rotation, and the time required to reach the target value can be shortened.

Next, the operation will be described based on the above-described embodiment. First, predetermined variable data such as the cut size of the film, the height and length of the packaged object, the number of products manufactured per unit time, etc. are input to the speed control device 38. And
The moving speed (target value) of the strip film 16 is obtained from the cut size and the number of products manufactured per unit time. The cut size and the moving speed are also transferred to the remaining amount calculating unit 48 via the speed control device 38.

The input of each of the above data is necessary for controlling the drive of the entire pillow packaging device. For the method of delivering the original roll, at least the cut size of the film and the production per unit time are required. All you need is the number. Also,
The moving speed (target value) of the strip film 16 may be directly input without inputting such data.

Next, according to a control command from the speed control device 38, the second and fourth drive motors 33 and 40 are each rotated at a predetermined rotational speed by a predetermined amount and then stopped. At this time, the speed at which the strip-shaped film 16 is drawn out due to the rotation of the second drive motor 33 is higher than that of the fourth drive motor 40.
It is set so as to be faster than the feeding speed of the strip-shaped film from the original roll 15 in accordance with the rotation of. As a result, the actual moving speed of the strip-shaped film is
8. Slip occurs at the center sealer 29 and the like, and the feeding speed of the strip-shaped film based on the slower fourth drive motor 40 is reached, and the strip-shaped film moves without sagging.

At the time of this movement, both rollers 51a and 51b of the first distance measuring device 51 also follow and rotate, and along with this, a predetermined pulse (pulse number N) is output, and in synchronization with the rotation of the original roll 15. As a result, the second distance measuring device 53 outputs a predetermined pulse (the number of pulses n) each time the rotating shaft 43 rotates and the magnetic material 56 passes in front of the magnetic force detector 57.

Then, the roll diameter calculating section 55 executes the above equations (1) and (2) based on the given n and N, and then executes the equation (3) to obtain the original roll diameter R0. Is calculated and transferred to the speed control device 38. As a result, the processing for calculating the original roll diameter at the beginning is completed.

In this calculation, the second and fourth drive motors 33 and 4 which are driven to move the strip film are used.
The drive timing of 0 (the above-mentioned fixed amount of rotation) may be, for example, a fixed time, or may be set to an arbitrary value even when the number of pulses n and / or N exceeds a preset threshold value. And when thresholding,
Both n and N may be compared with the same threshold value, or a threshold value suitable for each may be set. Also,
Only one of n and N may be set as a comparison target in advance, and the driving may be performed until the value exceeds a certain threshold value, and an arbitrary value can be set.

From the above moving speed (target value), the rotation speeds of the auxiliary roller 28 and the center sealer 29, that is,
The rotation speed of the second drive motor 33 for driving it is obtained. Further, the speed control device 38 calculates the rotation speed of the fourth drive motor 40 at the beginning of operation based on the initially set original roll diameter R0 and the moving speed (target value). Then, when the position alignment (initial setting) of each part is completed, the second drive motor 33 is driven to rotate at a constant speed at the rotation speed obtained above. Further, it is assumed that the belt-shaped film 16 is being conveyed at the moving speed (target value), and the first and third drive motors 27 and 35 are also driven to accelerate / decelerate at a predetermined timing. Further, the fourth drive motor 40 is also rotated based on the above calculation result (set to a speed slightly slower than the moving speed). As a result, the strip-shaped film that has been pulled out does not loosen up to the bag making device 18.

When the fourth drive motor 40 is rotationally driven, the original fabric roll 15 also rotates at a predetermined speed, and the belt-shaped film 16 is delivered from the original fabric roll 15. At the same time, the second drive motor 33 rotates at a constant speed and the auxiliary roller 28 and the like associated therewith also rotate at a constant speed, so that the fed strip-shaped film 16 passes through the bag-making machine 18 at a constant speed to form a cylinder. The product 20 to be packed is supplied to the inside while being formed into a bag-like film 19, and by further advancing as it is, the center sealer 29 seals the film polymerization end portion, and the end sealer 30 seals and cuts in the lateral direction for packaging. The body 34 is manufactured.

The feeding speed of the strip-shaped film 16 during the operation is controlled so as to follow it by increasing or decreasing the speed of the fourth drive motor 40. Therefore, the speed control device 38 increases the rotation speed of the fourth drive motor 40 in response to the decrease in the winding diameter of the original roll 15 to feed the strip film 16 at a constant speed. Moreover, since the speed control is constantly performed in real time, the rotation speed of the fourth drive motor 40 can be changed smoothly (without a step), so that the moving speed of the strip film 16 is close to the target value. A constant value is maintained at.

As described above, in the present embodiment, the roll diameter detecting device (the first and second distance measuring devices 51 and 53 and the roll diameter calculating device) which is a part of the device for calculating the remaining amount, which is an essential part of the present invention. Part 55), the function to detect the original roll diameter R0 at the beginning of the operation was added.
Since the rotation speed of the drive motor 40 can be set to an optimum value according to the diameter, the amount of the belt-shaped film fed from the original roll by the fourth drive motor 40 from the start and the second
The amount of withdrawal of the strip-shaped film by the drive motor 33 (per unit time) is maintained in a substantially equal relationship, and the strip-shaped film 16 is applied with a predetermined tension from the beginning without excess or deficiency.

Therefore, it is possible to carry out the packaging process in a desired state without causing an overcurrent to one of the motors and applying unnecessary tension to the strip-shaped film. And each time it starts, the roll diameter is detected, so
The diameter of the original roll is smaller than that when it is not in use, such as when the packaging device is stopped at the end of the work day, at the time of maintenance, etc., and then restarted or when the original roll in use is installed. As described above, even when the accurate diameter is unknown, the device can be surely operated in a desired state.

In this embodiment, no large equipment such as a braking device is required, and only a member such as a pulley 17 which is not bulky is provided between the material roll 15 and the bag making device 18. Since it is present, it is possible to reduce the size of the mounted packaging device as a whole and to reduce the size thereof.

As described above, during normal operation of the packaging machine, the strip-shaped film 16 is stably sent out, and the package is manufactured under the conditions set initially. Here, in the present invention, for example, if the roll diameter of the raw roll 15 being used is becoming smaller and the time for replacement is approaching, the user who performs such replacement processing uses the input device (not shown) for the remaining time. Enter the display command of.

Then, based on the roll diameter R at that time obtained by the roll diameter calculating section 55, the remaining amount calculating section 48 sequentially executes the processing from step 1 to step 5,
The remaining time is calculated and output to the display device 49. Then, the user confirms the remaining time, waits on the spot if it is relatively short, waits until all the strip-shaped film is pulled out from the original roll in use, and exchanges it with the next original roll. On the other hand, when the remaining time is comparatively harmful, the user temporarily leaves the place to perform other work, and when the time for replacement comes, returns to the side of the packaging machine again to perform the replacement process. In this way, the remaining time can be known, so that useless time can be eliminated, and work / processing can be performed according to the remaining time, so that productivity is improved.

Further, from the relationship between the remaining time and the end time or the scheduled operation stop time of the packaging machine, the original roll currently in use or the spare roll already prepared (brought by the packaging machine) It is possible to determine whether or not the number of original rolls is sufficient, and if not enough, it is possible to bring in the required number of original rolls. As a result, it is possible to temporarily store the original roll just beside the packaging machine,
It is not necessary to carry out re-transfer processing to the storage location after completion by bringing more than necessary, and work efficiency improves.

On the other hand, when the required number of products is given for the same package that is being manufactured by the original roll currently in use, the user can use the input device (not shown) to perform the remaining manufacturing process. Enter the display command for the number of pieces.

Then, based on the roll diameter R at that time obtained by the roll diameter calculating section 55, the remaining amount calculating section 48 sequentially executes the processing of steps 1, 2, 6 and 7 so that the remaining manufacture is possible. The number of products manufactured is calculated and output to the display device 49. Then, the user confirms the number of products manufactured,
It is judged whether or not the required number of packaging bodies can be manufactured by the currently used original roll, and if insufficient, the original roll is brought. On the other hand, when it is sufficient, after leaving the place once, a humorous word is given, and after returning to the packaging machine after a lapse of a predetermined time, the required number of packages are manufactured. In other words, there is no longer a roll of raw material, and there is no possibility of production stoppage.

In the above-described embodiment, the first and third drive motors 27 and 35 are respectively accelerated and decelerated at a predetermined timing, but the present invention is not limited to this, and the first and third drive motors are not limited to this. The drive motor 27 may rotate at a constant speed. That is, in the embodiment, the object to be packaged 20 is the packaging machine 1
The tubular film 19 that comes into contact with it when it is supplied to
Although it is moved at the same speed as that of the first drive motor 27 as described above, when the object to be packaged 20 is hard and does not collapse due to the contact resistance due to the speed difference with the tubular film 19. The control system can be simplified by rotating the machine at a constant speed to keep the conveying speed of the package supply device 22 constant.

The means for detecting the arc length of the original roll is not limited to the above-described embodiment, and for example, as shown in FIG. The roller 51a may be brought into contact with the outer peripheral surface of the rotating shaft 43 at a predetermined pressure, be held rotatably, and rotate following the rotation of the rotating shaft 43. As a result, when the rotary shaft 43 rotates, the number of pulses corresponding to the moving distance (arc length) of the outer peripheral surface of the rotary shaft 43 is sent to the roll diameter calculation unit, and the same measurement principle as the first distance measuring device is used. Therefore, the length of the arc is calculated.

The arc length to be measured in the present invention is a specific numerical value (X
cm, Ymm, etc.), but it is a concept that also includes a value corresponding to the length such as the number of pulses output from the encoder without calculating such a specific numerical value. Is also the same. Then, in such a case, the arithmetic processing based on proportionality is also executed in the state of indirect data such as the number of pulses.

In the modified example and the embodiment described above, the rotary shaft 43 on which the original roll 15 is mounted is a rotary body (the rotary shaft and the rotary body are used in common), and the arc length of the outer peripheral surface thereof is long. Although the present invention is not limited to this, the present invention is not limited to this, and a disc-shaped rotating body may be separately attached to this rotating shaft 43 and the arc length of the rotating body may be measured. good.

In the above-described embodiment, an example in which the packaging machine to be mounted is applied to the horizontal pillow packaging device in the above-described embodiments has been described. However, a vertical pillow packaging device, a horizontal three-way packaging device, a four-way packaging device, or the like is used. The packaging film can be applied to various packaging machines as long as it is continuously drawn from the original roll.

[0085]

As described above, in the packaging machine according to the present invention, it is possible to know the information regarding the remaining amount of the original roll currently in use. Therefore, when the remaining amount of data is the remaining time, there is no need to wait near the packaging machine even if the diameter of the original roll becomes smaller, and the processing according to the remaining time is performed elsewhere. be able to. Therefore, the productivity of the entire factory is improved. In addition, on the contrary, since all the band-shaped films can be returned to the side of the packaging machine before being pulled out from the roll, it is possible to eliminate the time when the band-shaped film to be supplied runs out and the packaging machine is temporarily stopped. It is suppressed as much as possible, and the operating efficiency of the packaging machine is improved.

Further, when the data of the remaining amount is the film length and the number of products manufactured, it can be easily and accurately determined whether or not the required number of packages can be manufactured by the used raw roll. It is possible to prepare spare original rolls without excess or deficiency, and it is possible to reduce useless labor due to the movement of the spare original rolls more than necessary.

Furthermore, since the above-mentioned data relating to the remaining amount is based on the roll diameter of the raw roll, it may be the raw roll in the middle of use or may not be constantly monitored from the beginning of use. Therefore, control and versatility are improved.

According to the sixth aspect of the present invention, in the control after the operation is started, the feeding of the strip-shaped film can be controlled on the side of the original roll, so when the drive motor is accelerated or decelerated, the rotation of the original roll is followed. The speed is also increased / decreased, and when the drive motor is stopped, the rotation of the original roll can also be stopped. Therefore, the original roll does not continue to rotate due to inertial force as in the conventional case, and a large-scale braking device for the original roll is not required.

Then, when the rotation of the drive motor is gradually increased at a predetermined rate in accordance with the decrease in the original roll diameter accompanying the feeding of the strip film, the strip film can be delivered at a constant speed. .

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a packaging machine according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing the vicinity of an original roll, which is a main part of the present embodiment.

FIG. 3 is a partially enlarged cross-sectional view showing a first distance measuring device which is an essential part of the present embodiment.

FIG. 4 is a diagram for explaining the operating principle of the present embodiment.

FIG. 5 is a flowchart illustrating a function of a remaining amount calculation unit.

FIG. 6 is a diagram showing another embodiment of a second distance measuring device.

FIG. 7 is a diagram showing a conventional technique.

[Explanation of symbols]

 15 original roll 16 belt-shaped film 28 auxiliary roller (supply means) 29 center sealer (supply means) 33 second drive motor (supply means) 38 speed control device (control means) 40 fourth drive motor (drive) Motor) 48 Remaining amount calculation unit (remaining amount calculation means) 49 Display device (output device) 51 First distance measuring device (roll diameter detecting means) 53 Second distance measuring device (roll diameter detecting means) 55 Roll diameter calculating unit ( Roll diameter detection means)

Claims (6)

[Claims] 1. A package is formed by wrapping an object to be packaged which is conveyed at a predetermined interval using a strip-shaped film continuously fed from an original roll, and sealing and / or cutting a predetermined portion of the film. In the packaging machine to be manufactured, a roll diameter detecting means for detecting the roll diameter of the original roll, and the remaining amount of the strip-shaped film wound on the original roll based on the roll diameter detected by the roll diameter detecting means. A packaging machine comprising: a remaining amount calculating means for determining the remaining amount; and an output device for outputting a calculation result by the remaining amount calculating means. 2. The remaining amount is a film length.
The packaging machine described in. 3. The packaging machine according to claim 1, wherein the remaining amount is a remaining time. 4. The packaging machine according to claim 1, wherein the remaining quantity is the remaining number of products manufactured. 5. A first distance measuring device, wherein the roll diameter detecting means directly or indirectly measures a moving distance of a strip-shaped film fed by rotation of the original roll, and in synchronization with the original roll. A second distance measuring device that directly or indirectly measures the arc length of the rotating rotating body, and receives moving distance data and arc length data measured by the first and second distance measuring devices, respectively. The packaging machine according to any one of claims 1 to 4, further comprising: a roll diameter calculation unit that calculates a raw roll diameter based on the output thereof. 6. A drive motor capable of controlling acceleration and deceleration for applying a rotational force to a rotary shaft on which the original roll is mounted, and a moving speed of a belt-shaped film delivered from the original roll to a predetermined speed. The packaging machine according to claim 1, further comprising a control unit that controls the drive motor.