JP6846211B2 - Rotary top seal device - Google Patents

Description

The present invention relates to a rotary top seal device.

The rotary top seal device includes a pair of rotary shafts arranged so as to face each other across the packaging film, and a top sealer attached to each rotary shaft. These top sealers have a built-in heater, and the sealing surfaces at the tips of each other are heated to a predetermined temperature. The pair of rotating shafts and thus the top sealer rotate synchronously, and the sealing surfaces of the paired top sealers come into contact with each rotation. At the time of this contact, the packaging film is sandwiched, heated and pressurized to heat-seal.

Further, usually, a cutter blade is built in the central portion of the sealing surface of one top sealer in the front-rear direction, and a receiving blade is built in the central portion of the sealing surface of the other top sealer in the front-rear direction. Therefore, at the time of the above contact, the cutter blade and the receiving blade cut the packaging film.

By the way, due to the relative misalignment of the product in the front-rear direction in the packaging film, a part of the product may be caught between the top sealers at the time of sealing, which may lead to poor sealing or damage to the product. In addition, not only the product but also foreign matter that has entered the packaging film may be bitten. It is necessary to eliminate these bitten packages as defective products, and there is a rotary top seal device having a bite detection function that detects the bite at the time of such sealing.

In this bite detection function, for example, as in the device disclosed in Patent Document 1, one rotating shaft rotates at a fixed position, and the other rotating shaft is relatively close to and separated from one rotating shaft. There is one that rotates in a supported state as much as possible and makes a judgment based on the inter-axis distance of a pair of rotating shafts. That is, when biting occurs, the distance between the pair of rotating shafts becomes longer by the distance corresponding to the thickness of the bitten product / foreign matter as compared with the case of normal sealing.

Therefore, a sensor is placed on the other rotating shaft, the position of the other rotating shaft in the approaching / separating movement direction is detected by the sensor, and the presence / absence of biting is determined by comparing the position with the threshold value. Output the result. Then, when the packaging machine on which the rotary top sealing device is mounted receives a bite detection output, the corresponding packaged product carried out from the rotary top sealing device is excluded.

JP 2015-58976

For example, in the case of a sealing device disclosed in Patent Document 1 in which a plurality of (two) top sealers are provided on one rotating shaft, the above-mentioned biting detection function may not be able to accurately detect biting. There is. That is, in the case of a device equipped with a plurality of top sealers on one rotating shaft, for example, due to the tolerance during processing of the top sealers and the assembly accuracy of the cutter blade, etc., even a normal sealing process without biting can be performed. The distance between the axes when the top sealers of the second set are in contact with each other may be different from the distance between the axes when the top sealers of the second set are in contact with each other. Then, since there is only one threshold value set in the sensor, the threshold value cannot be set severely, and it is difficult to improve the bite detection accuracy. Such a phenomenon becomes more remarkable as the number of top sealers attached to one rotating shaft increases, for example.

In order to solve the above-mentioned problems, the rotary top sealing device of the present invention includes (1) a pair of rotating shafts arranged across the packaging film and a top sealer attached to the pair of rotating shafts. The top sealer paired with the rotation of the pair of rotating shafts is a rotary top sealer that rotates synchronously and the sealing surfaces of the paired top sealer mesh with each other to seal the packaging film. , At least one of the pair of rotating shafts is configured to be able to move closer to and away from the other, and the distance between the axes of the pair of rotating shafts becomes longer when the sealing surfaces of the paired top sealers are engaged. A detection means for detecting the amount of change in the distance between the pair of rotating shafts and a determination means for determining the presence or absence of biting based on an output signal corresponding to the amount of change output by the detection means. The determination means determines the presence or absence of biting a plurality of times while the pair of rotation shafts make one rotation, and uses a threshold value set for each of the plurality of rotations. A plurality of sets of the top sealers to be attached to the rotating shaft are provided, the output signal when the top sealers are engaged is stored, and the history of each top sealer based on the stored output signal is simultaneously graphed on the same screen. includes a function to its function, the output value based on said output signal when each set of top sealer when the rotary shaft is one rotation are meshed, the same in the time axis of a graph that displays the history The graph is displayed so as to be arranged at the position.

The output signal according to the amount of change in the inter-axis distance may directly measure the inter-axis distance, but for example, when only one rotation axis (in the embodiment, the upper rotation axis) moves in the approaching and separating directions, the said It is preferable to detect the displacement amount of the position of one of the moving rotating shafts because the amount of change in the inter-axis distance can be easily obtained. Since the determination means performs the determination process based on the output signal of the detection means, it is configured separately from the detection means. When the control unit of the control device that controls the operation of the packaging machine / top seal device is used as the determination means as in the embodiment, the processing capacity of the CPU or the like of the control unit is high, and the determination is made while accessing various storage means. Since processing can be performed, high-speed processing and complicated processing may be performed.

When a product or other foreign matter is caught between the paired top sealers, the distance between the pair of rotating shafts becomes longer than that of a normal seal in which the pair of rotating shafts is not caught. The determination means determines the presence or absence of biting by comparing the output signal and the threshold value according to the amount of change in the inter-axis distance output from the detection means. Then, the determination is performed at a plurality of locations during one rotation of the rotation axis, but in the present invention, a threshold value as a reference value for performing this determination is set for each of the plurality of locations. It is possible to make an accurate judgment. That is, for example, due to the tolerance during machining of the top sealer, the rotating shaft, etc., the assembly accuracy of the cutter blade, etc., the distance between the shafts may differ at each place where the judgment is made even in the normal sealing process without biting. is there. Even in such a case, the presence or absence of biting can be correctly determined by setting an appropriate threshold value at each location.
If the output signal when the top sealers are engaged is stored and the history of each top sealer based on the stored output signal is displayed as a graph on the same screen at the same time, the history of the detection result can be displayed as a graph for each top sealer. Because there is, it is good because you can easily understand the state and situation of each top sealer.

(2) pre-Symbol judging means may be to perform the determination of the presence or absence of biting the basis of the threshold set for each their respective sets of top sealer. As a result, it is possible to stabilize the variation in detection due to the contact of each top sealer.

(3) The determination means may determine the presence or absence of the bite at a plurality of locations in the same rotation direction of the top sealer. The plurality of locations in the rotation direction of the top sealer may be two locations, an inlet side region and an outlet side region, such as the sealing surfaces on both the front and rear sides of the cutter blade in the top sealer provided with the cutter blade. Further, it may be a predetermined position between the cutter blade portion and the sealing surface. In this way, it is possible to determine the presence or absence of biting in a plurality of regions during the sealing process in one set of top sealers, so that more detailed biting determination can be performed for each region.

According to the present invention, in a device that determines the presence or absence of biting at a plurality of points while a pair of rotating shafts make one rotation, it is possible to accurately determine the biting at each point.

It is a figure which shows an example of the packaging machine which mounts the rotary top seal device which concerns on this invention. It is a figure which shows one preferable embodiment of the rotary top seal apparatus which concerns on this invention. It is a figure which shows the part which determines the presence or absence of biting. It is a figure which shows the display example of a programmable display. It is a figure explaining the modification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

FIG. 1 shows an example of a packaging machine including a preferred embodiment of the rotary top sealing device according to the present invention. The horizontal pillow wrapping machine is arranged on the wrapping machine main body 1, the film supply device 2 that continuously supplies a strip-shaped wrapping film to the wrapping machine main body 1, and the wrapping machine main body 1 on the upstream side. It is provided with a packaged object transporting and supplying device 4 that supplies the packaged object 3 to the main body 1 at predetermined intervals.

The film supply device 2 links the output of a drive motor (for example, a speed-controllable motor such as a servomotor) to the original roll 6 obtained by winding the strip-shaped film 5 into a roll, and the original roll It is supplied to the packaging machine main body 1 at a constant speed while appropriately controlling the rotation speed of 6. Further, various rollers 7 (only one is shown as a representative in the drawing) are arranged at predetermined positions from the raw roll 6 to the packaging machine main body 1, and the strip-shaped film 5 sent out from the raw roll 6 is provided. Is hung on the roller 7 and guided to the packaging machine main body 1 through a predetermined route. In the present invention, it is not always necessary to link the drive motor to the original roll 6, and a feed roller may be provided on the transport path of the packaging film to pull it out.

The packaged object transporting and feeding device 4 includes sprockets 9 arranged in the front-rear direction, endless chains 10 spanned on the plurality of sprockets 9, and a plurality of push fingers 11 attached to the endless chains 10 at predetermined pitch intervals. It is composed of. As a result, when the pushing finger 11 abuts on the rear surface of the object to be packaged 3, the object to be packaged 3 also moves forward on the transport path as the pushing finger 11 moves.

The packaging machine main body 1 includes a bag making device 15 for making a bag of the supplied strip film 5 into a tubular film 14, a center sealing device 16 arranged on the downstream side of the bag making device 15, and the center sealing device 16. The belt conveyor 17 that conveys the tubular film 14 arranged on the downstream side of the belt conveyor 17, the rotary top seal device 20 arranged on the downstream side of the belt conveyor 17, and the rotary top seal device 20 arranged on the downstream side of the rotary top seal device 20. It includes a carry-out conveyor 18 and a holding belt 19 located above the belt conveyor 17 and immediately before the rotary top seal device 20.

The bag making device 15 passes the strip-shaped film 5 continuously supplied from the film supply device 2 to contact (polymerize) both side edge portions 5a of the strip-shaped film 5 and form a tubular cylinder. The bag is made on the shape film 14. The bag making device 15 of the present embodiment is set so that the lower side is open and both side edge portions 5a of the strip-shaped film 5 are located on the lower side.

Further, the packaged object 3 sequentially supplied from the packaged object transporting and supplying device 4 to the packaging machine main body 1 is inserted into the bag making device 15. As a result, the objects to be packaged 3 supplied to the bag making device 15 are arranged in the tubular film 14 at predetermined intervals. Further, since the object to be packaged 3 is included in the tubular film 14 in this way, the belt conveyor 17 conveys the tubular film 14 containing the object to be packaged 3.

The center sealing device 16 seals both side edge portions 5a of the polymerized strip-shaped film 5. The center seal device 16 includes a pair of left and right sealers, and heat-seals the strip-shaped film 5 by sandwiching the overlapped portions of the edge portions 5a on both sides of the film 5 with the pair of sealers and heating the film.

The restraining belt 19 is arranged in the immediate vicinity on the upstream side of the rotary top sealing device 20 so as to prevent the object to be packaged 3 in the tubular film 14 from being lifted upward so that the restraining belt 19 can be conveyed while maintaining a horizontal state. I have to.

The rotary top sealing device 20 seals and cuts the tubular film 14 in a direction orthogonal to the traveling direction of the tubular film 14, that is, in a transverse direction. The film portion to be sealed and cut is a predetermined position between the front and rear objects to be packaged 3. As a result, by passing through the rotary top sealing device 20, the leading portion of the tubular film 14 is separated from the trailing portion, and the packaging body 12 is manufactured.

The rotary top seal device 20 includes a pair of upper rotary shafts 21 and lower rotary shafts 22 arranged one above the other with the tubular film 14 interposed therebetween, and a first upper top sealer attached to the upper rotary shaft 21 at intervals of 90 degrees. 23a, 2nd upper top sealer 23b, 3rd upper top sealer 23c, 4th upper top sealer 23d, 1st lower top sealer 24a attached to the lower rotating shaft 22 at 90 degree intervals, 2nd lower top sealer It includes 24b, a third lower top sealer 24c, and a fourth lower top sealer 24d.

These top sealers have a built-in heater, and the sealing surfaces at the tips of each other are heated to a predetermined temperature. A cutter blade 25 is built in the central portion of the first to fourth upper top sealers 23a to 23d in the front-rear direction in the front-rear direction. A receiving blade 26 is built in the central portion of the first to fourth lower top sealers 24a to 24d in the front-rear direction in the front-rear direction.

The pair of upper rotating shafts 21 and the lower rotating shafts 22 and thus each top sealer rotate in synchronization, and each time they rotate 90 degrees, the sealing surfaces of the paired top sealers come into contact with each other. Specifically, in the state shown in FIG. 1, the first upper top sealer 23a and the first lower top sealer 24a sandwich the tubular film 14, and when rotated 90 degrees in the direction of the arrow in the figure from the illustrated state. The second upper top sealer 23b and the second lower top sealer 24b sandwich the tubular film 14, and when further rotated 90 degrees, the third upper top sealer 23c and the third lower top sealer 24c sandwich the tubular film 14, and further. When rotated 90 degrees, the fourth upper top sealer 23d and the fourth lower top sealer 24d sandwich the tubular film 14. When the tubular film 14 is sandwiched between a pair of top sealers, a predetermined film portion of the tubular film 14 is heated and pressurized to be heat-sealed and cut. Therefore, when the upper rotating shaft 21 and the lower rotating shaft 22 make one rotation, the above-mentioned seal cutting process is performed four times to manufacture four packages 12.

As shown in FIG. 2, both ends of the upper rotating shaft 21 and the lower rotating shaft 22 are bearing-supported by the machine frame 30, and synchronous gears 31 are connected to both ends thereof. The synchronous gears 31 connected to the upper rotary shaft 21 and the lower rotary shaft 22 mesh with each other and can rotate in synchronization with each other, and rotate under the rotational force of the drive motor 32. Therefore, when the drive motor 32 is rotationally driven, the upper rotary shaft 21 and the lower rotary shaft 22 rotate in synchronization, and as described above, the sealing surfaces of the paired top sealers are formed on the tubular film 14. Heat and pressurize by sandwiching. The drive motor 32 is arranged on the back side of the horizontal pillow wrapping machine / rotary top seal device 20.

Although a specific illustration is omitted, the bearing portion that supports the lower rotating shaft 22 is fixed to the machine frame 30. Therefore, the lower rotating shaft 22 is supported by the machine frame 30 so as to extend in the horizontal direction, and rotates in a state where the vertical position is fixed. The left and right bearing portions that support the upper rotating shaft 21 are attached to the machine frame 30 so as to be movable in the vertical direction. As a result, the upper rotation shaft 21 can move in the vertical direction, and rotates in a horizontal or inclined state at an appropriate position in the vertical direction.

A first detector 35 and a second detector 36 are provided on both the left and right sides of the machine frame 30, respectively. The first detector 35 detects the distance of the upper rotating shaft 21 from the front side of the device in the axial direction, and the second detector 36 detects the distance of the upper rotating shaft 21 from the back side of the device in the axial direction. To do. To detect this distance, for example, the first detector 35 and the second detector 36 are fixed directly to the machine frame 30 or indirectly via a connecting member, and the distance to the side peripheral surface of the upper rotating shaft 21 is detected. It may be obtained by detecting the distance to the upper surface of the bearing portion that moves up and down together with the upper rotating shaft 21 or the reference surface of a member or the like connected to the bearing portion. Further, the first detector 35 and the second detector 36 are linked to the above-mentioned vertical bearing portion to move up and down integrally, and the distance from the reference plane provided on the machine frame 30 is detected. May be good. The first detector 35 and the second detector 36 each output a voltage (for example, 0 to 10 V, etc.) having a voltage value corresponding to the detected distance.

As shown in FIG. 3, the outputs of the first detector 35 and the second detector 36 are input to the control unit 41 of the control device 40. The control device 40 is composed of, for example, a PLC. The control device 40 includes a control unit 41 that controls various controls and various storage means. In the present embodiment, the storage means stores the work memory 42 that temporarily stores the acquired information, the calculation result, etc., the threshold value storage unit 43 that stores the threshold value that serves as the determination criterion for bite detection, and the detection result. A history data storage unit 44 to be stored is provided. The control unit 41 is connected to the programmable display 45. The programmable display 45 includes a touch panel, a function as an input device, a liquid crystal display, and the like, and has a function as an output device.

Further, although specific illustration is omitted, a reference portion indicating a reference angle position in the rotation direction is provided at a predetermined position on the peripheral surface of the upper rotation shaft 21 or the lower rotation shaft 22, and a sensor for detecting the reference portion is provided. Attach to the machine frame 30 or the like. As a result, every time the rotation shaft rotates once, a detection signal is output from the sensor, and the control unit 41 rotates the rotation shaft many times from the reference angle position based on the rotation angle information after the detection signal is output. It has a function to detect whether it is rotating. Therefore, for example, as shown in FIGS. 1 and 2, when the state in which the first upper top sealer 23a and the first lower top sealer 24a are in mesh with each other is positioned at a reference angle, the control unit 41 outputs a detection signal. Is obtained, it is detected that the state shown in FIGS. 1 and 2 is obtained. For example, when the rotation axis is rotated 90 degrees, the second upper top sealer 23b and the second lower top sealer 24b are engaged with each other. Detect. The upper rotary shaft 21 and the lower rotary shaft 22 are driven by a servomotor, and the timing at which the upper top sealer and the lower top sealer mesh with each other is controlled by the position control thereof. Then, in synchronization with the meshing timing, the first detector 35 and the second detector 36 output a signal for detecting the distance, and the signal also outputs the first detector 35 and the second detector 36. , Is input to the sequential control unit 41. Therefore, the control unit 41 is the first when the corresponding pair of top sealers mesh with each other based on the acquisition of the above detection signal and the rotation angle information from the detection signal, and based on the position information of the servomotor and the signal from the detector. Based on the output signals of the detector 35 and the second detector 36, the presence or absence of biting is determined. The specific function of making such a determination is as follows.

First, in the present embodiment, the threshold value for determining the presence or absence of biting is individually set for each of the first to fourth top sealers. Further, the threshold values for each top sealer set individually detect the threshold value (front side) to be compared with the output value of the first detector 35 that detects the distance on the front side and the distance on the back side. It has a threshold value (back side) to be compared with the output value of the second detector 36. These individually set threshold values are stored in a predetermined storage area of the threshold value storage unit 43, respectively. In the present embodiment, since four top sealers are attached to one rotation shaft, each threshold value is stored in each area of "1" to "4", for example.

The control unit 41 is set in association with the output values of the first detector 35 and the second detector 36 and the top sealer to be determined stored in the threshold value storage unit 43 when determining the presence or absence of biting. The threshold values (front side and back side) are compared with each other to determine the presence or absence of biting. Whether the threshold value or more or the threshold value or less is NG (bite) depends on the mounting state of the first detector 35 and the second detector 36. That is, when the output of the first detector 35 and the second detector 36 is increased (the detection distance becomes longer) as the upper rotation shaft 21 moves upward, the threshold value or more is regarded as NG. If the output of the first detector 35 and the second detector 36 decreases (the detection distance becomes shorter) as the upper rotation shaft 21 moves upward, the threshold value or less is determined to be NG. In this example, the threshold value is also NG, but if the threshold value is normal and exceeds the threshold value, it may be NG.

Then, the determination algorithm in the control unit 41 determines that biting has occurred when the output value of at least one of the first detector 35 and the second detector 36 is NG as compared with the corresponding threshold value. .. This is because, under normal conditions, when the tubular film 14 is sandwiched between a pair of top sealers, the upper rotating shaft 21 moves upward while maintaining a horizontal state. Therefore, for example, the output value of the first detector 35 and the second detector The output values of 36 are equal. Then, when the product or other foreign matter is caught, for example, when the thickness of the bitten foreign matter is uniform and is located over the entire width direction, the upper rotating shaft 21 maintains the horizontal state. It moves further up by the thickness. Then, both the output value of the first detector 35 and the output value of the second detector 36 are in the range of NG. Further, for example, when a foreign substance is bitten on one side in a direction orthogonal to the conveying direction of the tubular film 14 in the top sealer, the upper rotating shaft 21 is inclined by lifting the bitten portion side. Therefore, the output value of the detector on the lifted side is in the range of NG, but the output value of the detector on the opposite side may not be NG. Therefore, in the present embodiment, when the output value of at least one of the detectors becomes NG, it is determined that the bite has occurred.

Each threshold value registered in the threshold value storage unit 43 is performed by, for example, the control unit 41 as follows. First, the user operates the programmable display 45 and inputs the number N of the top sealers of the rotary top seal device 20 (“N = 4” in this embodiment). The control unit 41 acquires the number N of the top sealers set by the programmable display 45, determines the area (1 to N) to be used by the threshold storage unit 43, and determines the area (1 to N) used by the threshold storage unit 43, and the first detector 35 with respect to the rotation angle. , The acquisition timing based on the acquisition timing (every N / 360 degrees) of the output value of the second detector 36 is obtained.

Further, the rotation angle position of each top sealer, that is, information on how many times each top sealer rotates from the reference angle position to engage with the top sealer is set. In this setting, for example, the rotation angle information from the output of the detection signal to the first engagement of the top sealers (in this embodiment, “0 degrees” because they are simultaneous) is provided to the first upper top sealer 23a and the first lower. The rotation angle position value of the side top sealer 24a is registered as the rotation angle position (“0 degree” in this embodiment), and thereafter, “N / 360 degree” is added to the registered rotation angle information, and the second and second rotation angle position values are added. Register as the rotation angle position of each of the third and fourth top sealers.

The rotation angle information from the output of this detection signal to the first engagement of the top sealer may be set manually, for example, by the user operating the programmable display 45 and directly inputting a numerical value. The upper rotary shaft 21 and the lower rotary shaft 22 are actually rotated and stopped in a state where the predetermined top sealers are engaged with each other, and the control unit 41 acquires the rotation angle from the output from the detection signal to the stop. It is good to set it automatically based on it because it can be done accurately and easily.

Next, the tubular film 14 is actually passed through the rotary top sealing device 20 to perform a sealing / cutting process. At this time, in order to prevent biting, for example, it is advisable to manufacture an empty body without supplying a product. The control unit 41 acquires the output values from the first detector 35 and the second detector 36 at the timing when the first to fourth top sealers obtained from the detection signal and the rotation angle information of the rotation axis mesh with each other. Each top sealer is separately stored in the work memory 42. The control unit 41 obtains the average value of the output values for a predetermined number of times for each top sealer, obtains the threshold value of each top sealer based on the obtained average value, and registers it in the threshold value storage unit 43. The threshold value based on the average value is obtained by, for example, adding or subtracting a predetermined margin. If the margin is set in advance by the user in consideration of the thickness of the foreign matter that is expected to be bitten, it is preferable that the bite can be determined more accurately according to the actual situation.

Further, as another threshold value setting / registration method, for example, when the control unit 41 obtains the average value in the above-mentioned process, it outputs the calculation result to the programmable display 45 and waits for the input of the threshold value. .. The user inputs the threshold value individually while observing the calculation result. The control unit 41 may register each input threshold value in the corresponding threshold value storage unit 43. In this way, for example, the margin with respect to the average value can be adjusted for each individual top sealer, and more precise threshold setting can be performed.

As described above, when the horizontal pillow wrapping machine actually operates, the control unit 41 sets the threshold value and the output value of the first detector 35 and the second detector 36 each time the top sealer meshes. Is compared to determine the presence or absence of biting, and if there is biting, a biting detection signal is output. Then, the horizontal pillow wrapping machine disposes of the defective product based on the bite detection signal.

In the present embodiment, the first detector 35 and the second detector 36 detect the distance and output the detection result, and the control unit 41 of the control device 40 determines whether or not there is biting based on the distance. Furthermore, since the threshold value for determining the presence or absence of biting is set for each individual top sealer, for example, due to the tolerance during processing of the top sealer and the assembly accuracy of the cutter blade, etc., it is normal without biting. Even if the distance between the axes is different when the top sealers of each set come into contact with each other in the sealing process, an appropriate threshold value can be set in the different states, and accurate bite detection can be performed. Can be done.

The control unit 41 of the present embodiment has a history management function in addition to the above-mentioned biting presence / absence determination function. The history management function acquires the output values of the first detector 35 and the second detector 36 that are output every moment, stores them in the history data storage unit 44, calls the stored data, and displays the programmable display 45. It has a function to output.

As shown in FIG. 3, the history data storage unit 44 has a storage area for each top sealer, and outputs values of the first detector 35 and the second detector 36 acquired when determining the presence or absence of biting. Store in the storage area of the corresponding top sealer. In the present embodiment, since four top sealers are provided, they are stored in each area of "1" to "4", for example. As a result, when the operation of the horizontal pillow packaging machine is started, the control unit 41 acquires the output values output from the first detector 35 and the second detector 36 when the top sealers are engaged, and each of them Since it is stored in the area, the history data in which the output value for each top sealer is stored in time series is stored in each area.

The control unit 41 reads out the output value stored in the history data storage unit 44, and creates and displays a graph of time-series data whose horizontal axis corresponds to the passage of time and whose vertical axis is the output value (FIG. 4). reference). If this graph is data for a certain period from the current value to a predetermined time ago in real time, that is, for example, in an operating device, the user may know the trend information of the operating device. Further, in the present embodiment, the output value when each top sealer is meshed is stored, and the output value in the non-meshed section is not stored. Therefore, what corresponds to the passage of time on the horizontal axis is to arrange the data acquired and stored for each top sealer in chronological order. For example, the four output values obtained when the rotation axis makes one rotation are horizontal. Arranged on the same axis as the axis.

FIG. 4 shows an example of the display screen of the programmable display 45. As shown in FIG. 4, a layout is adopted in which the graph display unit 51 is provided in a wide area of the display screen, and the current data display unit 52 and the cursor position data display unit 53 are provided on the left side of the display screen. Further, in this example, a title 54 indicating the contents of the history data displayed on the graph display unit 51 and a cursor operation key 55 are provided above the graph display unit 51.

The title 54 is displayed as "the front side of the trend graph" in the example of the figure. The "trend graph" means historical data, and the "front side" means that the output value output from the first detector 35 is displayed. When displaying the output value of the second detector 36, "back side" is displayed.

The graph display unit 51 is an area for displaying a graph of time-series data for each top sealer described above. As shown in the figure, the control unit 41 draws four graphs a, b, c, and d corresponding to the four top sealers. In the illustrated example, the graph of a shows that biting did not occur, and the graphs of b and c show that biting P1 and P2 occurred once, respectively. Further, the graph of d shows a state in which the output value gradually increases with the passage of time, although it is within the normal range. If there is a certain tendency such as the output value gradually increasing or decreasing as shown in the graph of d, for example, the situation about the top sealer such as wear of the sealing surface / cutter blade and gradual shift of the position of the cutter blade. Understand. Then, when the output value gradually increases / decreases as in d, the threshold value is exceeded even if biting does not occur, and an NG judgment is made, or even if biting occurs, the threshold value is not exceeded and is normal. There is a possibility that a problem such as judgment may occur, and it is necessary to reset the threshold value in order to correctly judge the presence or absence of biting. Judgment as to whether or not it is necessary to reset the threshold value and whether or not it is urgent to reset the threshold value immediately after stopping the operating device is graphed. By looking at the historical data, the user can visually and intuitively understand it, and it is easy to identify the top sealer that needs adjustment. By displaying the historical data of the output values of all the top sealers separately for each top sealer in this way, it is necessary to adjust each state, for example, which top sealer is causing the bite. It is good because it is easy to understand the presence or absence of.

The current data display unit 52 is an area for displaying an output value when the latest top sealer is engaged. The control unit 41 displays the output value when the nearest first upper top sealer 23a and the first lower top sealer 24a are engaged with each other after "1CH". After "2CH", "3CH", and "4CH", the output value when the second, third, and fourth top sealers are engaged with each other is displayed.

When the control unit 41 detects that the left and right triangular button portions of the cursor operation key 55 are touched, the control unit 41 moves the cursor K shown in the graph display unit 51 in the pressed direction. The cursor position data display unit 53 is an area for displaying an output value when the top sealers at the time indicated by the cursor K are engaged. The control unit 41 acquires the data of each corresponding output value from the position of the cursor K and displays it in each column.

Further, in the present embodiment, the threshold values set for each of the first to fourth top sealers are set for each of the first detector 35 and the second detector 36, but the present invention is limited to this. For example, one threshold value common to the first detector 35 and the second detector 36 may be used.

Further, in the above-described embodiment and modified example, the threshold value is a threshold value (upper limit value) for detecting when the distance between the upper rotating shaft 21 and the lower rotating shaft 22 is separated by a certain amount or more due to biting. However, the present invention is not limited to this, and a threshold value (lower limit value) for detecting the case where the distance between the axes does not reach a predetermined distance at the time of normal sealing processing may be further provided.

In the above-described embodiment, an example in which a plurality of (4) top sealers are attached to one rotating shaft has been described, but the number of installations is arbitrary, and may be 2 to 3 or 5 or more. .. Further, since the present invention is a rotary top seal device capable of determining biting a plurality of times each time the rotary shaft makes one rotation, for example, one top sealer is attached to one rotary shaft. Even if it is, it suffices if there are a plurality of determination timings.

For example, as shown in FIG. 5, when a pair of top sealers 60 mesh with each other, the presence or absence of biting is determined a plurality of times (for example, twice). Here, the presence or absence of biting is not determined in the arrangement range of the cutter blade 61, and it is set in the front and rear of the cutter blade 61 in the rotation direction, that is, in the inlet side region R1 and the outlet side region R2 of the seal surface 60a, respectively. The bite is detected by the threshold value.

For example, when the cutter blade 61 protrudes outside the sealing surface 60a, the cutter blade 61 comes into contact with the tubular film 14 more than when the sealing surface 60a contacts the tubular film and is sandwiched from both sides for sealing. The distance between the axes of rotation is longer when cutting. Therefore, if a threshold value is set so as to determine that there is no biting in the distance between the shafts when cutting with the cutter blade 61, for example, if the thickness of the bitten product or other foreign matter is thin, the biting cannot be detected. There is a risk. Therefore, the presence or absence of biting is not determined in the portion of the cutter blade 61, and the biting is determined in the inlet side region R1 and the outlet side region R2 based on their respective threshold values. Can detect biting. Further, when biting occurs in only one of the inlet side region R1 and the outlet side region R2, which of the front side and the rear side of the top sealer 60 is the defective product in which the biting occurs. It is good because the defective product can be specified and the defective product can be appropriately excluded.

In this embodiment, the first detector 35 and the second detector 36 output an output signal according to the detected distance, and the determination of the presence or absence of biting based on the output signal recognizes the rotation angle position of the top sealer 60. Since the control unit 41 of the control device 40 performs the operation, it is possible to prevent the determination of biting in a desired region such as the arrangement range of the cutter blade 61.

Further, the function of determining the presence or absence of biting in a desired region such as the arrangement range of the cutter blade and performing the determination only in the section where the sealing surface is in contact with the tubular film 14 is described above, for example. It may be applied to an embodiment including a plurality of top sealers. Further, in that case, the threshold values of the inlet side region R1 and the outlet side region R2 set in the same top sealer may be the same.

Further, in the above-described embodiment and modification, the top seal device of the type in which the cutter blade is built in the top sealer has been described, but the present invention is not limited to this, and is applied to the type in which the cutter blade is not built. You may.

In the above-described embodiment and modification, the wrapping machine on which the rotary top sealing device is mounted is a horizontal pillow wrapping machine, but the application of the present invention is not limited to this, and for example, a vertical pillow wrapping machine may be used. , Deep drawing packaging machine, and other various packaging machines.

Although various aspects of the present invention have been described above with reference to embodiments and modifications, these embodiments and descriptions have not been made for the purpose of limiting the scope of the present invention, and are intended for understanding the present invention. It should be added that it was provided to contribute. The scope of the present invention is not limited to the configurations and manufacturing methods explicitly described herein, but also includes combinations of various aspects of the invention disclosed herein. Of the present invention, the configuration for which a patent is sought is specified in the appended claims, but even if the configuration is not currently specified in the claims, it is disclosed in the present specification. I would like to mention that there is a possibility of claiming a patent for this configuration in the future.

14 Cylindrical film 20 Rotary top sealer 21 Upper rotary shaft 22 Lower rotary shaft 23a Fourth upper top sealer 23b Second upper top sealer 23c Third upper top sealer 23d Fourth upper top sealer 24a First lower top sealer 24b Second lower top sealer 24c Third lower top sealer 24d Fourth lower top sealer 25 Cutter blade 26 Receiving blade 35 First detector 36 Second detector 40 Control device 41 Control unit 42 Work memory 43 Threshold Storage unit 44 History data storage unit 45 Programmable display 60 Top sealer 60a Seal surface 61 Cutter blade R1 Inlet side area R2 Outlet side area

Claims (3)

A pair of rotating shafts arranged across the packaging film,
With a top sealer that can be attached to the pair of rotating shafts,
The top sealer paired with the rotation of the pair of rotating shafts is a rotary top sealer that rotates synchronously and the sealing surfaces of the paired top sealer mesh with each other to seal the packaging film.
At least one of the pair of rotating shafts is configured to be able to move closer to and away from the other, and when the sealing surfaces of the paired top sealers are engaged, the distance between the axes of the pair of rotating shafts is increased.
A detection means for detecting the amount of change in the distance between the pair of rotating shafts,
A determination means for determining the presence or absence of biting based on an output signal according to the amount of change output by the detection means is provided.
The determination means determines the presence or absence of biting a plurality of times while the pair of rotation shafts make one rotation.
Make sure to use the threshold set for each of the multiple times.
A plurality of sets of the top sealers to be attached to the pair of rotating shafts are provided.
It has a function of storing the output signal when the top sealers are engaged and simultaneously displaying a graph of the history of each top sealer based on the stored output signals on the same screen .
The function is to arrange the output value based on the output signal when the top sealers of each set when the rotation axis makes one rotation at the same position on the time axis of the graph displaying the history. A rotary top seal device characterized in that the graph is displayed. The rotary top seal device according to claim 1, wherein the determination means determines the presence or absence of the bite based on the threshold value set for each of the top sealers of each set. The rotary top seal device according to claim 1 or 2, wherein the determination means determines the presence or absence of the bite at a plurality of locations in the same rotation direction of the top sealer.

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