JP3934747B2 - Control method of sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention forms a film into a cylindrical shape, fills the contents, seals the cylindrical body at a predetermined pitch, divides it into individual bag bodies, and then separates the individual bag bodies. The present invention relates to an apparatus, and more particularly, to a control method for correcting a portion where a cylindrical body is sealed with a gap.
[0002]
[Prior art]
A bag body W shown in FIG. 5D has a stick shape, and a liquid or powder is sealed inside.
This bag body W is formed into a cylindrical body 1A in which the edge portion of the film 1 having a resin layer that can be thermally welded on the inner surface is fitted into a palm state and is thermally welded to form a vertical seal portion 2, and then the upper and lower ends are formed. The flat portion is welded to form a seal portion 3a, and a notch (notch) 4 is formed in one seal portion.
Conventionally, in this type of bag body W, the vertical seal portion 2 and the seal portion 3a are both thermally welded. However, the welding strength is unstable only by thermal welding. For example, when a content such as liquid or powder is sandwiched between the seal portions 3a, the welding strength is extremely lowered.
[0003]
Therefore, it is considered that the cylindrical body is first heat-welded to form the heat-sealed portion 3a, and then the same portion is superposed and welded to form the seal portion 3b to improve the welding strength. Yes. When ultrasonic vibration is applied to the heat seal portion 3a, the film is heated by internal vibration energy and not only the melting of the resin layer on the inner surface is promoted, but also when the contents are sandwiched between the heat seal portions 3a. The contents can be removed from the seal portion by sonic vibration, and a decrease in welding strength due to the contents being sandwiched can be prevented.
[0004]
[Problems to be solved by the invention]
However, in the process of manufacturing the bag body W, the following problems arise when the cylindrical body is welded to form the seal portion.
(I) In order to form the sealing portion 3a at a predetermined pitch, the film 1 and the cylindrical body 1A are intermittently fed, and when the feeding operation is stopped, the cylindrical body is sandwiched between the heat sealing members and heated. Weld. At this time, in order to control the intermittent feed amount, generally, an alignment mark corresponding to the pitch of the seal portion 3a is attached to the film 1. In the conventional control method, when the detection means such as an optical detector or CCD detects a mark attached to the film 1, the feeding is stopped and the sealing member performs heat welding. However, when a mark is attached to the film 1, the mark pitch deviates from the normal position by, for example, about ± 0.5 mm due to printing accuracy, shrinkage of the film 1, and the like. In this case, if the mark is detected by the detecting means and the film 1 and the cylindrical body 1A are stopped, a shift occurs between the mark position and the seal portion 3a, and the shift amount is accumulated depending on the mark position shift. Will become bigger.
[0005]
(Ii) It is also possible to move the position of the heat seal member in accordance with the displacement of the mark so that the heat seal portion 3a is aligned with the mark. However, as shown in FIG. 5, after the heat seal 3a is formed, the intermittently fed cylindrical body is welded with ultrasonic waves to form the seal portion 3b. By performing the correction, the heat seal portion 3a does not coincide with the position where ultrasonic welding is performed.
[0006]
The present invention solves the above-described conventional problems, and detects the mark attached to the film to control the intermittent feed amount of the cylindrical body, and between the alignment mark attached to the film and the seal portion. It is an object of the present invention to provide a control method of a sealing device that enables correction of deviation.
[0007]
Furthermore, the present invention prevents the mark and the first seal member from being displaced when performing a double seal on the cylindrical body, and further includes a seal by the first seal member and a seal by the second seal member. It is an object of the present invention to provide a control method of a sealing device that prevents positional displacement.
[0008]
[Means for Solving the Problems]
  According to the control method of the sealing device of the present invention, after a cylindrical body formed of a film is filled with contents, the cylindrical body is sealed at a predetermined pitch to seal the cylindrical body and form individual bags. In the sealing apparatus to perform, it has the following procedures.
(1) The cylindrical body is intermittently fed at a reference feed amount L0, the sealing member is opposed to the cylindrical body when the intermittent feeding is stopped, and then the cylindrical body is sandwiched and sealed by the sealing member.
(2)When stopping the intermittent feedCompatible with seal pitchAnd attached to the filmmarkBy means of detecting whether or notDetect
(3) The detection position of the mark isFrom the normal detection positionWhen shifted, the intermittent feed amount of the cylindrical body is increased or decreased with respect to the reference feed amount L0.The mark detection position reaches the normal detection position in one intermittent feed or multiple intermittent feeds.Perform correctionWhen the mark detection position returns to the normal detection position, the corrected intermittent feed amount is returned to the reference feed amount.
(4)Depending on the reference feed amount returnedPerform a certain number of intermittent feeds,When correction is made for the returned reference feed amount,Intermittent feed amount, Or the increase / decrease value of the feed amount by correction, the average value of the mark pitch, or the deviation amount of the mark detection positionFind the average value of
(5)SoughtAverage valueTo obtain a new reference feed amount and a new reference feed amountThe reference feed amountL0Updated, and continued mark detection and intermittent feeding of cylindrical bodyWhen the detection position deviation of the mark occurs, a new reference feed amount is obtained and the reference feed amount L0 is updated again..
[0009]
The above invention does not stop the feeding of the cylindrical body when a mark on the film is detected as in the prior art, but averages the mark pitch error to obtain an average value. The cylindrical body is intermittently fed as a reference feed amount.
[0010]
That is, the reference feed amount is determined by the average value, the cylindrical body is intermittently fed at the reference feed amount, and the sealing member such as a heat seal member is opposed to the cylindrical body at the time of stopping, and then the cylindrical body Pinch. When there is no deviation in the mark detection position by the detection means installed at a predetermined position, intermittent feed of the cylindrical body is continued with the reference feed amount. When the mark detection position is shifted, the intermittent feed amount of the cylindrical body is increased or decreased by a predetermined dimension (for example, about ± 0.1 mm or ± 0.2 mm) with respect to the reference feed amount. When this increase / decrease is repeated and it is detected by the detection means that the mark is located at the normal position, the reference feed amount is restored.
[0011]
As a detection means for detecting the mark, it is possible to detect whether or not the stop position of the mark is at a regular position (a position of the reference feed amount), such as a CCD, and when it deviates from the regular position, What can also detect the amount of deviation is preferred. In this case, when the mark deviates from the normal stop position, the intermittent feed amount of the cylindrical body is increased or decreased so that the deviation amount can be corrected step by step in one time or several times. Let When the deviation amount is equal to or larger than a predetermined amount, the apparatus can be shifted to a process such as stopping the apparatus as a defective product.
[0012]
Further, when the detection means detects only whether the mark is in a regular position and the deviation amount cannot be detected, when the deviation occurs, for example, the feed amount of the cylindrical body is set to 0. 0. The mark is increased by 1 mm, and it is monitored whether or not the mark is detected at the normal position. When the mark is not detected, the mark is further increased by 0.1 mm. If the mark cannot be detected at the regular position, the intermittent feed amount is decreased by 0.1 mm. By repeating such an increase / decrease according to a predetermined rule or randomly, it is possible to correct the mark so that it is detected at the normal detection position.
[0013]
And the correction amount which increased / decreased the intermittent feed amount of a cylindrical body is hold | maintained and accumulate | stored in a control part, is calculated, and intermittent feed is calculated from the correction amount of the intermittent feed of predetermined times (for example, 30-40 times). An average value (average mark pitch) is obtained, and the processing operation is continued with this average value as a new reference feed amount.
[0014]
In the above invention, the cylindrical portion may be sandwiched by the movement of the seal member by sandwiching the cylindrical portion with a sealing member such as a heat seal or a clamping member that moves together with the sealing member. Alternatively, the intermittent feed amount of the cylindrical body may be increased or decreased by a feed means such as a roller without moving the position of the seal member.
[0015]
Further, as shown in FIG. 5, the above invention is not limited to a sealing device that performs heat sealing and ultrasonic sealing in an overlapping manner, and even if only a single sealing such as heat sealing or ultrasonic sealing is performed. Is possible. In this invention, the mark attached to the film can be used as a reference for intermittent feeding of the cylindrical body, and the deviation between the mark position and the seal portion position can be minimized. In particular, the average value of the feed amount (the average value of the mark pitch) is obtained from the correction operation, and this average value is updated as the reference feed amount. For example, the mark pitch is changed from the beginning of the film to the end of winding. Even when it is gradually increased or shortened, the intermittent feed amount (reference feed amount) can be corrected in accordance with the change in the average value of the pitch. Therefore, the deviation between the mark pitch and the seal position does not increase cumulatively, and an excessive correction amount can be prevented from occurring.
[0016]
In the present invention, a first seal (for example, a heat seal) and a second seal (for example, an ultrasonic seal) may be overlapped on a cylindrical body. It becomes like this.
[0017]
  The present invention also provides:A first cylinder that holds and seals the tubular body at the upstream position, moves to the downstream side following the intermittent movement of the tubular body, and further moves away from the tubular body to the upstream position to sandwich the tubular body. And a second seal member that is installed on the downstream side of the first seal member without moving in the feeding direction of the cylindrical body and seals the portion sealed by the first seal member in an overlapping manner. And perform the following sealing operationIs Umono.
(A) When intermittently feeding the cylindrical body by the reference feed amount L0InThe first seal member is moved to a position away from the second seal member by the reference distance H0.,Sandwich the tubular body,
(B)In the correction operation (3),The intermittent feed amount of the cylindrical body,Correction to increase or decrease the reference feed amount L0sometimes,The first seal member,More than the reference distance H0Of corrective actionThe cylindrical body is clamped by moving the distance Hx increased or decreased by the correction amount, thereby preventing a shift between the seal location by the first seal member and the seal location by the second seal member.
[0018]
Further, N bag bodies in which sealing by the first sealing member is completed between a position where the first sealing member sandwiches the cylindrical body and a position where the cylindrical body is sealed by the second sealing member. When (N is an integer) is present, the distance Hx between the sandwiched portion of the first seal member and the second seal member is the distance obtained by accumulating the individual intermittent feed amounts of the N bags. The intermittent feed amount Lx of the cylindrical body after the cylindrical body is clamped by the first seal member is made to match the seal interval of the N bag bodies closest to the second seal member. .
[0019]
In the above invention, for example, when the heat seal and the ultrasonic seal are overlapped on the same part of the cylindrical body, the mark is displaced from the reference position, and the first seal member sandwiches the cylindrical body accordingly. When the position to be corrected is corrected, it is possible to prevent a deviation from occurring between the subsequent sealing position by the second sealing member and the sealing position of the first sealing member.
[0020]
In this case, the first sealing member moves while holding the cylindrical body, or the moving distance of the pressing member that moves together with the first sealing member while holding the cylindrical body moves the cylindrical body. The intermittent feed amount Lx can be determined. That is, the cylindrical body may be clamped and pulled by the first seal member, or the cylindrical body may be clamped and pulled by the clamping member or the cooling member that moves together with the first seal member, thereby intermittently. You may send it.
[0021]
Further, before forming the cylindrical body with the film, the edge of the film to which the mark is attached is cut off, and the cut excess film is sent through a path different from the cylindrical body, and the cylindrical body is It is preferable to detect a mark attached to the surplus film at a position corresponding to a position where the film is sandwiched between the first seal members.
[0022]
With this configuration, the holding position by the first seal member and the position of the mark detected by the detection means are the same position in the length direction of the separated films, and the mark detection position and the holding position by the seal member are the same. The positions correspond one-to-one, and the accuracy of mark detection and feed operation correction can be improved.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing an almost entire structure of a bag making apparatus adopting the method for controlling a sealing apparatus of the present invention, FIG. 2 is an explanatory view of a sealing operation, and FIGS. 3A, 3B, and 4C. (A) and (B) are explanatory drawings of the feed amount correcting operation.
The stick-shaped bag body W shown in FIG. 5 (D) filled with the contents is intermittently continuously manufactured by the bag making apparatus shown in FIG.
[0024]
A strip-shaped film F having a large width is supplied to the bag making apparatus 10. The belt-like film F is formed by laminating a resin film and an aluminum foil or the like, and when it is formed into a bag body W later, a portion serving as an inner surface becomes a heat-weldable resin layer (sealant layer). Yes. The belt-like film F is intermittently fed mainly by the vertical movement of the elevating part K. However, an intermittent feeding force may act on the belt-like film F by the intermittent rotation operation of the roll disposed at any position together with the vertical movement of the elevating unit K.
[0025]
The belt-like film F enters the grooved roll 11 provided at the uppermost portion, and the grooved roll 11 is formed with a plurality of grooves 11a, and the cutter 12 can be pressed into each groove 11a. The band-like film F is sectioned and cut in the width direction by the cutter 12 and separated into a plurality of films 1 (three in FIG. 1). It is to be noted that, by cutting out the plurality of films 1 having a predetermined width, an extra short-width surplus film Fa is cut out at the edge of the strip-like film F. The short-width surplus film Fa is formed by surplus film guide rolls 15. And intermittently moves at the same speed as the film 1.
[0026]
The surplus film Fa is provided with an alignment mark m at the same pitch as that of the seal portions 3a and 3b of the bag body to be manufactured. In addition, a detection means P for detecting the mark m is provided. The detecting means P is a CCD or the like, and can detect whether or not the mark m on the surplus film Fa that stops simultaneously with the intermittent feeding of the film 1 and the cylindrical body stops at the normal position. At the same time, the shift amount can be detected. This deviation amount detection output is given to the control unit 50 described later.
[0027]
Moreover, the location where the film 1 is sandwiched by the heat sealing member 29 which is the first sealing member and the location where the detection means P faces the surplus film Fa are at the same length in the feeding direction of the film F. Is set. At the same position in the feeding direction of the film F, the cylindrical body is sandwiched by the heat seal member 29 and the detection means P faces the position. Therefore, the detection position of the mark m by the detection means P and the heat seal member 29 The clamping position corresponds to the one-to-one correspondence on the film, and the mark deviation can be corrected with high accuracy.
[0028]
Each film 1 separated into a certain width is sandwiched between a guide roll 13 and a pinch roll 14 and guided downward. Each film 1 guided downward is supplied into each molding hole 16a formed in the molding plate 16, and is formed into a cylindrical shape by the molding hole 16a. The forming plate 16 is provided with guide claws 17 facing the respective forming holes 16 a, and both edge portions 1 a and 1 a in the width direction of the respective films 1 are adjusted to the palm state by the guide claws 17. FIG. 5A shows an enlarged view of a state in which the film 1 is formed into a cylindrical shape by the forming hole 16a and the edge portions 1a and 1a are adjusted to the palmar state. The heat-weldable resin layer (sealant) is directed to the mating surface of the jointed state.
[0029]
As shown in FIG. 1, a vertical seal portion S <b> 1 is provided at the rear stage (downward) of the forming plate 16, and a plurality of sets of vertical seal members 18 are provided for each film 1 in the vertical seal portion S <b> 1. ing. Each vertical seal member 18 heat seals the edge portions 1a of the film 1 which are joined together, and the vertical seal member 18 is intermittently pressed against the edge portion 1a of the film which is intermittently fed. Repeat the separation operation. The edges 1a are heat-sealed by the press-contact operation of the vertical seal member 18, but FIG. 5 (B) shows a state in which the vertical seal portion 2 is formed by this heat welding operation to become a cylindrical body 1A. The vertical seal portion 2 is indicated by hatching.
[0030]
As shown in FIG. 1, a filling nozzle 19 is inserted into each molding hole 16a of the molding plate 16 from above the molding plate 16, and a liquid or liquid is introduced into the cylindrical body 1A in which the vertical seal portion 2 is formed. The contents of the powder are filled while the flow rate is controlled.
The elevating part K is located below the vertical seal member 18. The elevating base 20 of the elevating part K is supported by a guide rail (not shown) provided on the gantry of the entire apparatus so as to be reciprocally movable in the up and down direction in the figure. A screw shaft 21 is fixed to the elevating base 20. A female screw driving member 22 that is screwed onto the screw shaft 21 is rotatably provided on the gantry of the entire apparatus. When the female screw driving member 22 is rotationally driven by the servo motor M, the elevating part K is driven up and down. However, by controlling the rotation speed of the servo motor M, the ascending position and the descending distance of the elevating part K can be varied.
[0031]
The elevating part K is provided with a heat seal part S2 that performs horizontal sealing at the upper stage, and a clamping pressure cooling part C at the lower stage. The heat seal part S2 and the clamping pressure cooling part C are mounted on the lifting base 20 and move up and down together with the lifting base 20 with a constant distance in the vertical direction between the heat sealing part S2 and the clamping pressure cooling part C.
[0032]
In the heat seal portion S2, a drive cylinder 23 fixed to the elevating base 20 is provided, and the drive link 24 connected in a dogleg shape by the plunger of the drive cylinder 23 is driven to extend and contract. The plunger of the drive cylinder 23 is connected to a connection fulcrum 24 a at the midpoint of the drive link 24. One end of the drive link 24 is connected to the drive plate 25 and the other end is connected to the drive plate 26. In FIG. 1, the drive link 24 has a dogleg shape, but when the plunger of the drive cylinder 23 is pulled from this state, the drive link 24 extends linearly, the drive plate 25 extends in the X2 direction, and the drive plate 26 extends in the X1 direction. Move symmetrically. A pair of rods 27 is fixed to one drive plate 25, the rods 27 are slidably inserted into the drive plate 26, and a receiving plate 28 is fixed to the tip of the rod 27. When the drive plate 25 is driven in the X2 direction by the drive cylinder 23, the receiving plate 28 connected by the rod 27 moves together in the X2 direction.
[0033]
The drive plate 26 is fixedly provided with a heat seal member (thermal welding plate) 29 serving as a first seal member facing each of the three cylindrical films, with the cylindrical film interposed therebetween. A counter plate 31 faces the heat seal member 29. The counter plate 31 is supported on the receiving plate 28 via a shock absorber 32.
[0034]
In the heat seal portion S2, when the plunger of the drive cylinder 23 is pulled and the drive link 24 extends linearly, the drive plate 26 is driven in the X1 direction, and the drive plate 25, the rod 27, and the receiving plate 28 together are X2. The cylindrical film is crushed by the heat seal member 29 and the counter plate 31 provided on the drive plate 26 by being driven in the direction, and the film is thermally welded by the heat applied from the heat seal member 29 to the film. . The upper part of FIG. 5C shows a state in which the cylindrical film is crushed and thermally welded, and the heat seal portion is indicated by reference numeral 3a.
[0035]
The driving mechanism of the sandwiched cooling part C is substantially the same as that of the heat seal part S2. That is, a drive cylinder 35 is fixed to the elevating base 20, and one end of a dog-shaped drive link (same as indicated by reference numeral 24) driven by a plunger of the drive cylinder 35 is connected to the drive plate 36. The ends are connected to the pinching members 37, respectively. A pair of rods 38 fixed to the drive plate 36 are slidably inserted into the pinching member 37, and a receiving plate 39 is fixed to the tip of the rod 38. A counter plate 41 is supported on the receiving plate 39 via a shock absorber (not shown). The pinching member 37 and the counter plate 41 function as a driving member and a cooling member for intermittent feeding.
[0036]
In the clamping pressure cooling section C, when the plunger of the driving cylinder 35 is sucked and the dog-shaped driving link extends linearly, the clamping member 37 is driven in the X1 direction, and the driving plate 36 and the driving plate 36 are The fixed rod 38 and the receiving plate 39 fixed to the rod 38 are driven together in the X2 direction. As a result, as shown in FIG. 5C, the cylindrical body 1A is pinched by the pinching member 37 and the counter plate 41, and the heat seal portion 3a is cooled. In addition, while the heat seal portion 3a is pinched by the pinching member 37 and the counter plate 41, the entire lifting portion K moves in the downward direction, thereby intermittently moving downward in the figure with respect to each film 1 and the cylindrical body 1A. Feed force is given. That is, the intermittent feeding force of the cylindrical body 1 </ b> A is exhibited by the moving force of the pinching member 37 and the counter plate 41. However, the cylindrical body 1 </ b> A may be intermittently fed by a force that sandwiches and lowers the cylindrical body 1 </ b> A between the heat seal member 29 and the counter plate 31.
[0037]
In the clamping pressure cooling unit C, a cutter holder 42 is provided on the receiving plate 39, and a cutter (notch forming member) 43 is supported on each cutter holder 42. When the heat seal portion 3a is pinched by the pinching member 37 and the counter plate 41, the cutter 43 makes a cut in the heat seal portion 3a, and this cut is a notch shown in FIGS. 5C and 5D. 4 This notch 4 is a part that becomes a trigger when the completed bag body W is opened.
[0038]
As shown in FIG. 1, an ultrasonic seal portion S3 is provided below the elevating portion K. In the ultrasonic seal portion S3, the holder 45 is fixed to the gantry of the entire apparatus without moving in the feeding direction of the cylindrical body 1A, and the horn 46 and the anvil which are opposed to each other with the films 1 sandwiched in the holder 45. 47, that is, an ultrasonic seal member serving as a second seal member is provided. In addition, drive means for pressing the horn 46 and the anvil 47 together is provided. The heat seal portion 3a welded by the heat seal portion S2 is further ultrasonically welded by the ultrasonic seal portion S3, and the seal portion 3b shown in the lower part of FIG. 5C is completed.
[0039]
Further, a cutting mechanism is provided at a position below the ultrasonic seal portion S3. With this cutting mechanism, the seal portion 3b is cut along a cutting line LL shown in FIG. Separated into individual bags W shown.
FIG. 1 shows a control unit 50 that controls the operation of the entire apparatus. By this control unit 50, a drive unit 51 of a servo motor M that drives the lifting unit K up and down, the drive cylinders 23 and 35, and an ultrasonic seal. Part S3 is controlled.
[0040]
Next, the operation of the bag making apparatus will be described.
As shown in FIG. 1, the belt-like film F is cut by a cutter 12 and separated into a plurality of strips 1 having a constant width. Each film 1 is formed into a cylindrical shape by the forming hole 16a of the forming plate 16, and the edges 1a of the film 1 are guided by the guide claws 17 so as to be in a palmed state (see FIG. 5A).
[0041]
In the elevating part K, the female screw driving member 22 is rotationally driven by the power of the servo motor M, the elevating force is applied to the screw shaft 21, and the elevating part K repeats the elevating operation. In the meantime, in the clamping pressure cooling section C, the driving plate 35 and the clamping member 37 are driven by the driving cylinder 35, and the clamping member 37 and the opposing plate 41 repeat the pressing / separating operation. 2, the pressing member 37 and the opposing plate 41 move away from the lowered position (1) to the separated position (2), and further rise by the feed amount. The position (3) is reached, and further pressed against each other to reach the clamping position (4). Each film 1 is stopped during the period from the lowered position (1) to the clamping position (4) through (2) and (3).
[0042]
The box operation described above causes each film 1 to be intermittently fed downward by a predetermined feed amount. During the stop period of the film 1 in this intermittent feed operation (when the elevating part K is raised), the vertical seal portion In S <b> 1, each set of vertical seal members 18 sandwiches the edges 1 a with which the film 1 is held together, and heat is applied from the vertical seal members 18, so that the edges 1 a are heat-sealed together with each other. Then, the vertical seal portion 2 is formed (see FIG. 5B).
The cylindrical body 1A in which the vertical seal portion 2 is formed is filled with contents such as liquid or powder from the filling nozzle 19.
[0043]
Further, the heat sealing member 29 and the counter plate 31 are also in the same box operation, facing the portion to be welded of the cylindrical body 1A at the rising position {circle around (3)}, and then reaching the sandwiching position {circle around (4)}. It is clamped and further lowered to the lowered position {circle around (1)} and is separated to reach the separated position {circle around (2)}. Then, the film is heated by the heat seal member 29 within a predetermined period of time from when the heat seal member 29 reaches the holding position {circle around (4)} to the lowered position {circle around (1)}, thereby forming the heat seal portion 3a.
[0044]
Immediately after the completion of the thermal welding, the heat sealing member 29 and the counter plate 31 are separated from each other and rise by an amount corresponding to the intermittent feed amount, and together, the pinching member 37 and the counter plate 41 of the pinching cooling section C rise. Then, it moves from the rising position (3) to the clamping position (4), and the heat sealing part 3a is clamped by the clamping member 37 and the opposing plate 41. And it descends to the lowered position (1). During this time, the heat sealing portion 3 a is cooled by the pinching member 37 and the counter plate 41, and the notch 4 is formed by the cutter (notch forming member) 43.
[0045]
In addition, during the stop period of the intermittent feeding operation of the film 1 (when the elevating part K is raised), in the ultrasonic seal part S3, the horn 46 and the anvil 47 serving as the second seal members are connected to each heat seal part 3a. And the ultrasonic vibration is applied to the horn 46, and the heat seal portion 3a is further ultrasonically welded to form the seal portion 3b shown in the lower part of FIG. 5C. Further, at the position below the ultrasonic seal portion S3, the intermediate portion of the seal portion 3b is cut along a cutting line LL and separated into individual bag bodies W.
[0046]
Next, the intermittent feeding correction operation of the film 1 and the cylindrical body 1A, that is, the control method of the sealing device of the present invention will be described.
As shown in FIG. 1, the surplus film Fa cut and separated from the belt-like film F is intermittently fed at the same cycle as each separated film 1. Although the mark m is attached to the surplus film Fa, when the tubular body 1A is sandwiched between the heat sealing member 29 and the opposing plate 31 that have reached the sandwiching position (4), The corresponding mark m moves on the detection means P.
[0047]
Here, the intermittent feed amount by which the elevating part K descends after the cylindrical body 1A is sandwiched between the heat seal member 29 and the counter plate 31 is determined by using the average value of the pitch at which the mark m is formed as the reference feed amount L0. It is done. When the average value obtained at a certain time becomes the reference feed amount L0, the descending distance of the elevating part K is set to the reference feed amount L0, and the cylindrical body 1A sandwiched between the pinching member 37 and the opposing plate 41 is The reference feed amount L0 is lowered. When the tubular body 1A stops and the surplus film Fa stops together with this, the detection means P measures whether or not the mark m attached to the surplus film Fa has stopped at the normal position. While the mark m continues to stop at the regular position, the descending distance of the elevating part K is continued at the reference feed amount L0.
[0048]
Next, when the cylindrical body 1A is intermittently fed at the reference feed amount L0 and the film 1 and the cylindrical body 1A are stopped, the mark m is detected on the detection means P at a proper position (for example, detection by the detection means P). If the position shift occurs without stopping at the center of the range, a correction operation is performed. In this correction operation, the elevating part K changes the rising height to the rising position {circle around (3)} and changes the lowering distance to the lowering position {circle around (1)}. Thereby, the intermittent feed amount of the film 1 and the cylindrical body 1A is changed, and the mark m is corrected so as to reach the median value of the detection range of the detection means P. In this correction, the intermittent feed amount may be increased or decreased so that the shift amount of the mark m from the normal detection position is corrected several times, or the shift amount is corrected by increasing or decreasing the single feed amount. May be.
[0049]
And as a result of correction | amendment, if the mark m returns to a regular detection position, after that, the intermittent feed amount of the cylindrical body 1A will be returned to the reference | standard feed amount L0. When the mark m reaches the normal detection position by the detection means P, the portion on the film 1 that is the same position as the mark m reaches the clamping position (4), and the heat seal member 29 and the counter plate 31 It is pinched.
[0050]
Further, when the intermittent feed is repeated a predetermined number of times (for example, about 30 to 40 times or more) and the reference feed amount L0 is corrected, the intermittent feed amount for correction or the feed amount by correction is changed. From the increase / decrease value, the average value of the pitch of the mark m attached to the film 1 or the average value of the shift amount of the mark m is obtained, thereby obtaining a new reference feed amount L0. Thereafter, the elevating part K is moved up and down by the reference feed amount L0, and the film 1 and the cylindrical body 1A are intermittently fed by the L0.
Then, the film 1 and the cylindrical body 1A are repeatedly intermittently fed with the new reference feed amount L0. As a result, if the position of the mark m is displaced, the correction operation is further performed. Then, the reference feed amount L0 is updated again.
[0051]
As described above, in the present invention, when the reference feed amount L0 is set as the intermittent feed amount of the cylindrical body 1A and the mark detection position is shifted during the intermittent feed at the reference feed amount L0, the intermittent feed is performed. The amount is corrected by increasing / decreasing the amount, but the reference feed amount L0 itself can be updated by further adding this correction value.
Therefore, for example, when the average value of the pitch of the mark m gradually changes, changes randomly, or changes regularly from the start to the end of winding of the film 1, the average It becomes possible to follow the fluctuation of the value. For example, when the average value of the pitch of the mark m gradually increases or decreases from the beginning to the end of winding of the original fabric, the film 1 is sequentially fed if the reference feed amount L0 is fixed. Accordingly, the correction value of the intermittent feed amount of the film 1 increases, and the correction operation may not be able to follow. On the other hand, in the present invention, it is possible to prevent the correction amount from becoming excessive as described above by changing the reference feed amount L0 itself.
[0052]
As described above, in order to correct the shift of the detection position of the mark m, the vertical distance of the film 1 and the cylindrical body 1A is corrected by changing the vertical distance of the vertical part K. However, since the ultrasonic seal portion S3 having the second seal member does not move in the feeding direction of the cylindrical body 1A, when the lift distance of the lift portion K is corrected, the heat seal portion 3a formed by the heat seal portion S2. And the ultrasonic seal position by the ultrasonic seal portion S3 may be displaced.
Therefore, in order to prevent such a deviation from occurring, the ascending position and the descending distance (intermittent feed amount) of the elevating unit K are controlled as follows.
[0053]
  For example, the reference feed amount L0 for intermittent feed of the cylindrical body 1A at the start130 mm. In this case, in the elevating part K, the distance between the heat seal member 29 and the counter plate 31 which are the first seal members, and the pinching member 37 and the counter plate 41 is fixed to 130 mm. Further, the heat seal portion 3a is 3 between the position where the cylindrical body 1A is sandwiched between the heat seal member 29 and the counter plate 31 and the position where the horn 46 and the anvil 47 as the second seal member are sandwiched. Exist,SectionBetween materialsIt is assumed that there are N = 4 bag bodies W.
[0054]
As shown in FIG. 3A, when the detection position of the mark m by the detection means P is not shifted, the cylindrical body 1A is intermittently fed with the reference feed amount L0 = 130 mm, but the rising position ▲ 3 The elevating position of the elevating part K is controlled so that the distance between the heat sealing member 29 and the counter plate 31 that has reached ▼ and the clamping position ④, and the horn 46 and the anvil 47 is the reference distance H0 = 520 mm. .
While the reference feed amount L0 is intermittently fed, the detection position of the mark m is displaced, and in order to correct this displacement, the intermittent feed amount of the cylindrical body 1A is set to 0.1 mm from the reference feed amount L0. FIG. 3B shows a state in which the intermittent feed amount Lx = 129.9 mm is shortened and this is repeated several times to correct the mark m detection position to the normal position.
[0055]
  In this case, the ascent position of the elevating part K(3)The distance between the heat seal member 29, the opposing plate 31, the horn 46, and the anvil 47 when reaching theH0519.6 mm shorter by 0.4 mm. At this position, the tubular body 1A is sandwiched between the heat seal member 29 and the counter plate 31, and the pinching member 37 and the counter plate 41, and the elevating part K is lowered.(1)The distance Lx when descending to 129.9 mm is 129.9 mm. As a result, the intermittent feed amount Lx of the cylindrical body 1A can be made shorter than the reference feed amount L0, and the heat sealing position by the heat sealing member 29 and the position where ultrasonic sealing is performed by the horn 46 and the anvil 47, Can be matched.
[0056]
  FIG. 3C shows a case where the intermittent feed amount Lx of the cylindrical body 1A is increased to 130.1 mm and correction is repeated several times in order to correct the shift of the detection position of the mark m. Yes. In this case, the distance Hx between the heat sealing member 29 and the opposing plate 31, the horn 46 and the anvil 47 when the elevating part K is raised is 0.4 mm longer than the reference distance H0, Hx =520.4mm. Also,thisAfter the cylindrical body 1A is sandwiched between the heat seal member 29 and the counter plate 31 at the height position, the elevating part K is in the lowered position.(1)The feed amount Lx to reach 130.1 mm. By setting the lift position and the feed amount of the elevating part K in this way, the heat seal part 3a formed by the heat seal member 29 can be matched with the ultrasonic seal position.
[0057]
4A and 4B show a case where the intermittent feed amount for correction changes randomly.
FIG. 4A shows a case where the intermittent feed amount Lx is changed to 129.9 mm, 130 mm, 130.1 mm, and 130.2 mm in order to correct the deviation of the mark m. At this time, the distance Hx between the heat seal member 29 and the counter plate 31 reaching the ascending position (3) and the horn 46 and the anvil 47 is 520.2 mm. The descending distance of the elevating part K after sandwiching the body 1A coincides with the length 129.9 mm of the bag body (A) located at the bottom of the N packages (immediately above the ultrasonic seal part S3). Let
[0058]
Similarly, in FIG. 4B, the distance between the heat seal member 29 and the counter plate 31 that have reached the ascending position (3), the horn 46 and the anvil 47 is Hx = 520.6 mm. The descending distance (intermittent feed amount) of the elevating part K after sandwiching the cylindrical body 1A with the opposing plate 31 is the distance between the horn 46 and the heat seal part 3a of the bag body (A) located just above the anvil 47. To 130 mm. Thereby, the heat seal part 3a can be made to correspond with an ultrasonic seal part.
[0059]
As described above, the distance between the position of the heat seal member 29 as the first seal member when it is raised and the horn 46 and the anvil 47 as the second seal members are such that there are N bags between them. The intermittent feed amount after the cylindrical body 1A is sandwiched between the heat seal member 29 and the counter plate 31 is set to the lowest value, after being matched with the cumulative value of the intermittent feed amount of the N individual bags. By making it correspond to the dimension between the heat seal portions 3a of the bag body (A), it is possible to prevent the occurrence of deviation between the heat seal portion and the ultrasonic seal portion.
[0060]
As described above, when a shift occurs in the detection position of the mark m, the shift position is corrected by changing the holding position by the heat seal member 29 when the cylindrical body 1A stops and changing the intermittent feed amount. However, at this time, the distance Hx between the heat seal member 29 and the ultrasonic seal portion is set as shown in FIGS. 3 and 4, and the subsequent intermittent feed amount Lx is adjusted to the length of the lowermost bag body. As a result of performing the correction operation, it is possible to prevent the two seal positions from being displaced.
In the present invention, the first seal member is a heat seal member and the second seal portion is an ultrasonic seal member, but the combination of the first seal member and the second seal member is other. There may be.
[0061]
【The invention's effect】
As described above, in the present invention, when the film and the cylindrical body are intermittently fed based on the pitch of the marks attached to the film and sealed at a constant interval, the mark position deviation can be corrected effectively. .
[0062]
In addition, when sealing is performed on the same portion of the cylindrical body, it is possible to prevent the relative displacement of the seal portion due to the correction operation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the overall structure of a bag making apparatus using a control method for a sealing apparatus of the present invention,
FIG. 2 is a side view showing the welding and cooling process of the bag body and the operation of the pinching member,
FIGS. 3A to 3C are explanatory views showing a method of correcting a sealing operation,
FIGS. 4A and 4B are explanatory diagrams showing a method for correcting a sealing operation,
FIGS. 5A to 5D are perspective views showing a manufacturing process of a bag body,
[Explanation of symbols]
F Strip film
K lifting part
S1 Vertical seal
S2 Heat seal part
S3 Ultrasonic seal
C Clamping cooling unit
1 film
3a Heat seal part
3b Sealed part after ultrasonic welding
4 notches
12 Cutter
16 Molded plate
18 Vertical seal member
19 Filling nozzle
20 Lifting base
29 Heat seal member (first seal member)
31 Opposing plate
37 Clamping member
41 Opposing plate
43 Cutter
46 Horn (second seal member)
47 Anvil (second seal member)

Claims (5)

In a sealing device that forms individual bags by sealing the cylindrical body at a predetermined pitch after filling the cylindrical body formed of a film with the contents, the following procedure is provided. A control method for a sealing device.
(1) The cylindrical body is intermittently fed at a reference feed amount L0, the sealing member is opposed to the cylindrical body when the intermittent feeding is stopped, and then the cylindrical body is sandwiched and sealed by the sealing member.
(2) When the intermittent feeding is stopped , the detection unit detects whether or not the mark attached to the film corresponding to the seal pitch has stopped at a regular position .
(3) When the detection position of the mark deviates from the normal detection position , the intermittent feed amount of the cylindrical body is increased or decreased with respect to the reference feed amount L0, and a single intermittent feed or plural sensing the position of the mark in the indexing times are have rows correction reaching the detection position of the normal, when the detection position of the mark is restored to the detection position of the normal, returning the intermittent feed amount after correction to the reference feeding amount,
Performs intermittent feeding of a predetermined number of times (4) returned reference feeding amount, at the time of performing the correction to the reference feeding amount returned, the intermittent feed amount for the correction or the variation value for the feed amount by the correction, Find the average value of the pitch of the mark, or the average value of the deviation amount of the detection position of the mark ,
(5) obtains the new reference feeding amount by the average values obtained, updates the new reference feeding amount as the reference feeding amount L0, continuing the intermittent feeding operation of the mark detection and the tubular member, detecting the position of the mark If a deviation occurs, a new reference feed amount is obtained, and the reference feed amount L0 is updated again . A first cylinder that holds and seals the tubular body at the upstream position, moves to the downstream side following the intermittent movement of the tubular body, and further moves away from the tubular body to the upstream position to sandwich the tubular body. And a second seal member that is installed on the downstream side of the first seal member without moving in the feeding direction of the cylindrical body and seals the portion sealed by the first seal member in an overlapping manner. The method for controlling a sealing device according to claim 1, wherein the following sealing operation is performed.
(A) a tubular body when only the intermittent feed the reference feeding amount L0, moves the first sealing member to the reference distance H0 away than the second sealing member, sandwiching the tubular body,
(B) In the correction operation (3), when correction is performed to increase or decrease the intermittent feed amount of the cylindrical body with respect to the reference feed amount L0 , the first seal member is moved to the reference distance H0. The cylindrical body is clamped by moving the distance Hx that is increased or decreased by the correction amount of the correction operation, and between the seal location by the first seal member and the seal location by the second seal member. Prevent misalignment,   Between the position where the first sealing member sandwiches the cylindrical body and the position where the cylindrical body is sealed by the second sealing member, N bags (N Is an integer), the distance Hx between the first seal member clamping portion and the second seal member is a distance obtained by accumulating the individual intermittent feed amounts of the N bags. The intermittent feed amount Lx of the cylindrical body after sandwiching the cylindrical body with one seal member is matched with the seal interval of the N bag bodies closest to the second seal member. Control method of sealing device. The intermittent movement of the cylindrical body at the moving distance that the first seal member moves while sandwiching the cylindrical body or the moving distance of the clamping member that moves together with the first seal member while sandwiching the cylindrical body The control method of the sealing device according to claim 2, wherein the feed amount Lx is determined. Before forming the cylindrical body with the film, cut off the edge of the film to which the mark is attached, and send the separated excess film through a path different from the cylindrical body , The control method of the sealing apparatus in any one of Claim 2 thru | or 4 which detects the stop position of the mark attached | subjected to the excess film.

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