JP2017071433A - Center seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center seal device having an ultrasonic sealer capable of controlling dense seal pressure.SOLUTION: A center seal device 16 seals a part of overlapping both side edge parts 5a of a belt-like film 5 formed in a cylindrical shape, and comprises an ultrasonic horn 35 and an anvil 43 for ultrasonically sealing by ultrasonic vibration and pressurization force by sandwiching both side edge parts, and is constituted for executing its approach-separation by a dual stroke cylinder 60 so that the ultrasonic horn and the anvil relatively approaches-separates. The dual stroke cylinder is constituted so that the tip of a cylinder rod 60a moves up to a first position by a first-stage stroke and the tip of the cylinder rod moves so as to further project more than the first position by a second-stage stroke, and lowers air pressure supplied for executing the second-stage stroke more than air pressure supplied for executing the first-stage stroke.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a center seal device, and more particularly to a device using an ultrasonic sealer.

  For example, as disclosed in Patent Document 1 and the like, there is a center seal device of a pillow packaging machine that uses an ultrasonic sealer. The apparatus disclosed in Patent Document 1 passes an ultrasonic seal by passing a superposed portion of a film in which both ends of a bag formed in a cylindrical shape are overlapped between an ultrasonic horn and an anvil arranged opposite to each other. Do. Further, the ultrasonic horn is linked to an air-operated slide, and the ultrasonic horn is configured to approach and separate from the anvil by the air-operated slide. Thereby, when the ultrasonic horn and the anvil are separated from each other, the overlapped portion of the film is inserted and set in the gap formed between them. And when an ultrasonic horn and an anvil contact, an ultrasonic horn presses with a predetermined pressure with respect to an anvil, and maintains the appropriate working pressure of an ultrasonic horn.

Special table 2004-530601

  In the above-described conventional center seal device, since the ultrasonic horn is pressed against and separated from the anvil by a common actuator, there is a problem that a precise seal pressure cannot be adjusted. That is, if an approach / separation is to be performed quickly and with a certain stroke, a large air pressure is required during operation, and the ultrasonic horn may be pressed against the anvil with an excessive pressure. Therefore, there is a possibility that an appropriate seal cannot be performed.

  In order to solve the above-described problems, a center seal device of the present invention is (1) a center seal device that is used in a packaging machine and seals a portion where both side edge portions of a cylindrical film are overlapped. An ultrasonic horn and an anvil for sandwiching the edge portions on both sides and ultrasonically sealing by ultrasonic vibration and pressure, so that the ultrasonic horn and the anvil are relatively close to each other, In the dual stroke cylinder, the tip of the cylinder rod moves to the first position in the first stroke, and the tip of the cylinder rod moves to the first position in the second stroke. It moves so as to protrude further than the first position, and the second stroke is more than the air pressure supplied to perform the first stroke. And to reduce the air pressure supplied to Utame.

  According to the present invention, the opening and closing of the ultrasonic horn and anvil is controlled with the first stroke, and the pressurization is performed with the second stroke. Therefore, since the opening / closing operation does not have to be taken into consideration in the second stroke, it is possible to set the pressure to an appropriate level for ultrasonic sealing, and it is possible to control the sealing pressure precisely.

With the dual stroke cylinder, the applied pressure can be set to an appropriate magnitude while ensuring a sufficient moving distance for opening and closing, so that the apparatus becomes compact and can be easily transferred to an existing apparatus.
(2) The anvil may be moved by the output of the dual stroke cylinder.

  According to the present invention, precise control of the sealing pressure becomes possible.

It is a top view which shows an example of the pillow packaging machine which mounts the center seal apparatus which concerns on this invention. It is a front view showing one suitable embodiment of a center seal device concerning the present invention. FIG. It is a front view which shows the modification of the center seal apparatus which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not construed as being limited thereto, 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 pillow packaging machine equipped with a center seal device according to the present invention. The pillow wrapping machine is disposed on the upstream side of the wrapping machine main body 1, the film supply device 2 for continuously supplying a strip-shaped wrapping film to the wrapping machine main body 1, and the wrapping machine. A packaged article transport and supply device 4 that supplies the packaged article 3 to the main body 1 at predetermined intervals is provided.

  The film supply device 2 links the output of a driving motor (not shown) such as a servo motor, which is not shown, to the original roll 6 obtained by winding the belt-like film 5 into a roll. Supplying to the packaging machine body 1 at a constant speed while appropriately controlling the rotation speed. Further, various rollers 7 (only one is shown in the figure as a representative) are arranged at predetermined positions from the original fabric roll 6 to the packaging machine body 1, and the belt-like film 5 fed out from the original fabric roll 6. Is guided to the packaging machine main body 1 through a predetermined path by being passed over the roller 7. In the present invention, it is not always necessary to link the drive motor to the original fabric roll 6, and a feed roller may be provided on the transport path of the packaging film and pulled out.

  The package transport / supply device 4 includes a sprocket 9 disposed at the front and rear, an endless chain 10 spanned by the plurality of sprockets 9, and a plurality of push fingers 11 attached to the endless chain 10 at a predetermined pitch. It consists of. Thereby, when the pushing finger 11 hits the rear surface of the article to be packaged 3, the article to be packaged 3 moves forward on the conveyance path as the pushing finger 11 moves.

  The packaging machine main body 1 includes a bag making device 15 for making the supplied belt-like film 5 into a tubular film 14, and both side edge portions of the polymerized belt-like film 5 disposed on the downstream side of the bag making device 15. A center seal device 16 that seals 5a, a belt conveyor 17 that conveys the tubular film 14 disposed downstream of the center seal device 16, a top seal device 20 disposed downstream of the belt conveyor 17, A carry-out conveyor 18 disposed on the downstream side of the top seal device 20 and a holding belt 19 disposed above the belt conveyor 17 and immediately before the top seal device 20 are provided.

  The bag making device 15 allows the side film edges 5a of the belt-like film 5 to contact (polymerize) with each other by passing the belt-like film 5 continuously supplied from the film supply device 2, and the tube that has become cylindrical. Bag-like film 14 is made. The bag making machine 15 of the present embodiment is set so that the lower side is open and the side edge portions 5a of the belt-like film 5 are positioned on the lower side.

  In addition, the articles to be packaged 3 that are sequentially supplied from the article to be packaged conveyance supply device 4 to the packaging machine body 1 are inserted into the bag making machine 15. Thereby, the to-be-packaged goods 3 supplied to the bag making machine 15 are arrange | positioned in the cylindrical film 14 for every predetermined space | interval. Further, since the article to be packaged 3 is included in the cylindrical film 14 in this way, the belt conveyor 17 conveys the cylindrical film 14 including the article to be packaged 3.

  The top seal device 20 seals and cuts the tubular film 14 in a direction orthogonal to the traveling direction, that is, in a transverse direction. The film part to be sealed / cut is a predetermined position between the front and back objects 3 to be packaged. Thereby, the top part of the cylindrical film 14 is isolate | separated from the succeeding by passing the top seal apparatus 20, and the package 25 is manufactured.

  The top seal device 20 of the present embodiment is of a so-called box motion type, and a pair of top sealers 21 and 22 arranged vertically are kept in a state where the seal surfaces 21a and 22a are opposed to each other. A drive mechanism is provided for revolving around the trajectory. Both the top sealers 21 and 22 operated by this drive mechanism move toward each other from a reference position separated by a predetermined distance, and sandwich the tubular film 14 from above and below, so that the film portions that are in contact with the sealing surfaces 21a and 22a are located. Pressurize at a predetermined pressure and heat. Both the top sealers 21 and 22 move forward along the moving direction of the tubular film 14 while maintaining the state in which the tubular films 14 are held close to each other as described above. The moving speed at this time is equal to the moving speed of the tubular film 14. Both the top sealers 21 and 22 move away from each other when moved by a predetermined distance, and move in the direction opposite to the moving direction of the tubular film 14 to reach the reference position.

  2 and 3 show an embodiment of the center seal device 16 of the present embodiment. In this embodiment, a rotary ultrasonic sealer is used. The center seal device 16 includes an ultrasonic horn unit 31 and an anvil unit 32 that are arranged side by side in a lateral direction that intersects the transport direction of the belt-like film 5.

  The ultrasonic horn unit 31 includes a disk-shaped ultrasonic horn 35, a converter that is disposed below the ultrasonic horn 35 and generates ultrasonic waves for ultrasonically vibrating the ultrasonic horn 35, an amplifying booster, and the like. The drive source 36 is provided. The drive source 36 is supported by a bearing 38 at its upper and lower positions, and is linked to a machine frame 39. By this bearing support, the drive source 36 rotates about the vertical axis, and the ultrasonic horn 35 also rotates integrally therewith. The ultrasonic horn 35 vibrates so that the diameter is enlarged / reduced by the power of the drive source 36.

  The anvil unit 32 includes a disk-shaped anvil 43. The anvil 43 is formed with ridges 43a projecting outward on its side circumferential surface so as to be continuous in the circumferential direction. As will be described later, the ultrasonic horn 35 and the anvil 43 are configured so as to relatively move / separate from each other, and when both move close to each other, between the protrusion 43a and the side surface of the ultrasonic horn 35, Both side edge portions 5a of the belt-like film 5 are clamped with a predetermined pressure.

  A rotating shaft member 44 is linked to the lower surface of the anvil 43, and the rotating shaft member 44 is supported by the moving bearing member 45. A connecting member 46 extending in the vertical direction is attached to the lower surface of the moving bearing member 45, and a slider 47 is connected to the lower end of the connecting member 46. The slider 47 is linked to a guide rail 48 arranged so as to extend in the lateral direction intersecting the transport direction of the belt-like film 5. As a result, when the slider 47 reciprocates linearly along the guide rail 48, the moving bearing member 45 and thus the anvil 43 reciprocates linearly in the lateral direction. Therefore, it is guided that the anvil 43 approaches / separates toward the ultrasonic horn 35.

  In the present embodiment, the dual stroke cylinder 60 is used as a drive source for reciprocating the anvil 43. That is, the main body of the dual stroke cylinder 60 is fixed to the support wall 53. And the front-end | tip of the cylinder rod 60a is connected with the convex part 45a for attachment which made a part of side surface of the movement bearing member 45 protrude outside.

  The dual stroke cylinder 60 reciprocates the cylinder rod 60a with a two-stage stroke. In the present embodiment, predetermined first air is supplied to the first port from the reference position where the cylinder rod 60a is most housed in the main body, the cylinder rod 60a is moved forward to the first position, and then the second port The second air is supplied to the cylinder rod 60a to further advance the cylinder rod 60a to the second position. On the other hand, when the third air is supplied from the third port when the cylinder rod 60a is in the second position, the cylinder rod 60a moves backward and returns to the reference position. The dual stroke cylinder 60 is generally used as an actuator for positioning at two different positions, and the first air and the second air are relatively large at the same pressure. While the pressure of one air is relatively large, the second air is set to a low pressure. The pressure of the third air is assumed to be large like the pressure of the first air. Moreover, you may make it supply 1st air and 3rd air by switching of a solenoid valve, for example.

  The dual stroke cylinder 60 is used and operates as follows. When the cylinder rod 60a is at the reference position, the ultrasonic horn 35 and the anvil 43 are separated from each other by an appropriate distance, and both side edge portions 5a of the belt-like film 5 can be inserted and set in the separated space. When the cylinder rod 60a reaches the first position with the first stroke, the ultrasonic horn 35 and the anvil 43 approach each other but are not in contact with each other. Since the pressure of the first air is large, the first air moves at a stretch in a short time. However, the first position is set near half of the second position, and the ultrasonic horn 35 and the anvil 43 remain in a non-contact state even when the first position is reached.

  Next, when the cylinder rod 60a moves to the second position with the second stroke, the anvil 43 comes into contact with the ultrasonic horn 35 in the middle thereof, and the forward movement is suppressed, and the ultrasonic horn 35 and the anvil 43 are Press at a certain pressure. The pressure of the second air is a low pressure, and it is not necessary to consider the opening / closing operation associated with the movement of the anvil 43. Therefore, the pressure can be set to an appropriate pressure for ultrasonic sealing, and a precise control of the sealing pressure is possible. Is possible.

  As described above, the cylinder rod 60a is moved quickly to the first position and slowly moved from the first position to the second position (actually, the position where the ultrasonic horn 35 and the anvil 43 are in contact). The supply of air to each port for pressing the ultrasonic horn 35 and the anvil 43 at a predetermined pressure is not limited to those described above, and various controls can be performed. For example, low pressure second air is always supplied to the second port located in the middle, and high pressure first air / third air is appropriately supplied to the first port and the third port located on both sides. Good.

  On the other hand, the upper end of the universal joint 50 is connected to the lower end of the rotating shaft member 44, and the lower part of the universal joint 50 is supported by the fixed bearing member 51. The fixed bearing member 51 and the guide rail 48 are connected to the side wall 52.

  And the ultrasonic horn 35 of this embodiment and the anvil 43 rotate synchronously, and the strip | belt-shaped film 5 is conveyed smoothly. That is, the gear 55 is connected to the lower end of the drive source 36 on the ultrasonic horn unit 31 side. On the anvil unit 32 side, a gear 56 is connected to the lower end of the universal joint 50. Then, the gear 55 and the gear 56 are engaged with each other. The gear 56 is linked to a drive motor 58 via a power transmission mechanism 57 in which a plurality of gears are combined. Since the universal joint 50 is provided, the lateral movement of the anvil 43 is allowed, and the rotational force is transmitted to the anvil 43. Therefore, when the drive motor 58 is rotationally driven, the gear 56 and the gear 55 are rotated, and the anvil 43 and the ultrasonic horn 35 are rotated in synchronization.

  According to the present embodiment, both side edge portions 5a of the belt-like film 5 are sandwiched with an appropriate sealing pressure by the dual stroke cylinder 60, and the ultrasonic horn 35 is ultrasonically vibrated with a desired amplitude, whereby the both side edge portions 5a. Can be sealed neatly. Furthermore, since the ultrasonic horn 35 and the anvil 43 rotate at a speed corresponding to the conveying speed of the belt-like film 5, the ultrasonic horn 35 and the anvil 43 can be sealed without stress to the side edge portions 5a.

  In the above-described embodiment, the rotary sealer is used as the ultrasonic sealer, but the present invention is not limited to this and may be a fixed type. For example, as shown in FIG. 4, a center seal device 16 'using a fixed ultrasonic sealer includes an ultrasonic horn unit 31' and an anvil unit 32 'arranged side by side in a transverse direction intersecting the transport direction of the belt-like film 5. Is provided.

  The ultrasonic horn unit 31 ′ is a driving source such as an ultrasonic booster which is disposed beside the ultrasonic horn 35 ′ and ultrasonically vibrates the ultrasonic horn 35 ′. 36 '. The anvil unit 32 'includes a disk-shaped anvil 43'. The anvil 43 ′ is formed with ridges 43 a ′ protruding outward on the side peripheral surface thereof so as to be continuous in the circumferential direction. The ultrasonic horn 35 ′ and the anvil 43 ′ are configured to relatively move / separate from each other, and when both move close to each other, between the protrusion 43 a ′ and the side surface of the ultrasonic horn 35 ′, Both side edge portions 5a of the belt-like film 5 are clamped with a predetermined pressure.

  The anvil 43 'is mounted on a slider 47' linked to the guide rail 48 'so as to be linearly reciprocable. Then, the tip of the cylinder rod 60a of the dual stroke cylinder 60 is connected to the slider 47 '. Similar to the above-described embodiment, the dual stroke cylinder 60 opens and closes the ultrasonic horn with the first stroke based on the high gas pressure, and between the ground acoustic horn and the anvil with the second stroke based on the low gas pressure. Since the pressurization is performed at the above, precise control of the seal pressure becomes possible. Since other configurations and operational effects are the same as those of the above-described embodiment, detailed description thereof is omitted.

  In the embodiment and the modification described above, the anvil unit side is moved laterally by the dual stroke cylinder. However, the present invention is not limited to this, and the ultrasonic horn unit side may be moved. good.

16, 16 'Center seal device 31, 31' Ultrasonic horn unit 32, 32 'Anvil unit 35, 35' Ultrasonic horn 36, 36 'Drive source 43, 43' Anvil 47, 47 'Slider 48, 48' Guide rail 60 Dual stroke cylinder 60a Cylinder rod

Claims (2)

A center seal device that seals a portion where both side edges of a film formed in a cylindrical shape are used in a packaging machine,
An ultrasonic horn and an anvil for ultrasonically sealing with ultrasonic vibration and pressure by sandwiching both side edge portions,
The ultrasonic horn and the anvil are relatively approached and separated, and the approach and separation are performed by a dual stroke cylinder,
In the dual stroke cylinder, the tip of the cylinder rod moves to the first position with the first stroke, and the tip of the cylinder rod moves so as to protrude further than the first position with the second stroke. A center seal device characterized in that the air pressure supplied to perform the second-stage stroke is smaller than the air pressure supplied to perform the first-stage stroke.   The center seal device according to claim 1, wherein the anvil is moved by an output of the dual stroke cylinder.

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