JP5028155B2 - End seal device - Google Patents

Description

  The present invention relates to an end seal device, and more specifically, relates to a packaging film that moves on the end seal device and a transfer device that stably transports an object to be packaged wrapped in the packaging film. .

  In automatic packaging machines, bag making devices, etc., an end seal device is arranged on the carry-out side, the film formed in a cylindrical shape is sealed and cut in the direction crossing the traveling direction, and individual packages (empty bags) Body).

  One type of end seal device is a rotary end seal device. In this type, an end sealer is attached to each of rotating shafts opposed to each other above and below the film to be conveyed. At this time, the peripheral surfaces meshing with each other at the tips of the end sealers become the seal surfaces, and the seal surfaces of the end sealers arranged above and below are in contact with each other to sandwich the film. And since the heater is incorporated in the end sealer, the film is heated and melted by sandwiching the film, thereby being heat-sealed and sealed.

  By the way, the sealing surfaces of the end sealers attached to the pair of upper and lower rotating shafts contact each time the rotating shaft makes one rotation, and in other sections, the end sealers are separated from each other. A predetermined space is generated between the rotating shafts. Therefore, as it is, there is nothing to be supported on the lower side of the article to be packaged that moves in the predetermined space between the rotating shafts, so that the object to be packaged is slightly inclined or misaligned. Then, for example, the article to be packaged does not move horizontally along the conveyance surface, and the tubular film may pulsate following the movement, so that the packaging process cannot be performed correctly.

In order to solve such a problem, there is a conventional one in which a cylindrical guide cover is arranged concentrically with the rotation shaft so as to cover the periphery of the lower rotation shaft. The guide cover has a portion opened in the end sealer, and the end sealer projects from the opening portion. And the guide cover is set so that it may contact the conveyance surface of the packaging film which encloses a to-be-packaged object. As a result, in the non-contact section where the end sealer is not engaged, the guide cover exists between the upper and lower rotating shafts, and the packaging film containing the article to be packaged is in contact with and supported by the guide cover. An end seal device provided with a transition mechanism having such a configuration is disclosed in, for example, Patent Document 1 and the like.
Japanese Utility Model Publication No. 56-26612

  However, the above-described conventional apparatus has the following problems. That is, since the guide cover comes into contact with the packaging film containing the packaged object at one point (line contact in the axial direction) at the uppermost point of the guide cover, sufficient support cannot be performed. . In particular, if the packaged object is a collection of a plurality of small articles or is brittle, the packaged object may collapse.

  The tip of the end sealer is particularly high when the height of the packaged item is high or the position where the seal surfaces of both end sealers are in contact is set above the middle of the packaged height. The radius of the circle of the movement locus of the sealing surface increases, and along with this, the separation distance of the conveyor device arranged before and after the traveling direction of the end seal device becomes longer, and the guide cover supports the upper and lower rotary shafts. Since it is on the connecting line, there is a possibility that sufficient support cannot be achieved.

  The uppermost point of the guide cover lies on a line connecting the two rotation axes, and the surface of the guide cover gradually lowers as the distance from the rotation axis increases, so there is a gap between the transport device arranged before and after the end seal device. Arise. From such a point, there is a possibility that smooth conveyance cannot be performed.

  The present invention has been made in view of the above-described background, and an object of the present invention is to provide a rotational end seal device in the end seal device even when the upper and lower end sealers are not in contact with each other. An object of the present invention is to provide an end seal device that supports a packaging film that encloses a package and can be smoothly conveyed.

In order to achieve the above-described object, an end seal device according to the present invention includes: (1) an end seal device including a pair of rotating shafts and end sealers respectively connected to the pair of rotating shafts; A pair of groove cams arranged so that both ends of the rotation shaft penetrate each other, a plate cam arranged to face the inside of the groove cam and rotating together with the lower rotation shaft, and the pair of groove cams A plurality of rod-shaped members (corresponding to “round bars”) that are linked to a groove portion provided in the groove portion and movable along the locus of the groove portion, and the groove portion formed in the groove cam is endless. The plate cam is provided with a plurality of strip-shaped guide portions extending radially, and the guide portion penetrates in the thickness direction of the plate cam, and each guide that has passed therethrough is formed flat. The rod-shaped member is inserted into the part Configured urchin, the so can be removed by separating part of the components of the grooved cam, removing a part of the component, the groove is opened, take out the rod member from its open portion Configured to be possible.

  (2) The guide portion may be a cut portion extending from the outer peripheral edge of the plate cam toward the center. In the embodiment, the cut portion is formed as described above, but may be a long hole that does not open to the outer peripheral edge. (3) A mechanism for moving the upper and lower rotary shafts up and down in a vertical direction with the groove cam fixed may be provided.

  With the above configuration, in the present invention, the plate cam also rotates with the rotation of the rotating shaft, and the rod-shaped component inserted into the guide portion of the plate cam rotates (revolves) following the rotation. At this time, since both ends of the rod-shaped member are linked to the groove portions of the pair of groove cams, the rod-shaped member moves along the locus of the groove portions. Since the uppermost part of the groove is flat, the rod-shaped member that moves on the flat part has a shorter distance from the center of rotation as the revolving movement proceeds, but the guide is arranged radially, so that By reciprocating while reciprocating along the guide part, it can move along the locus of the groove part.

  When the end sealer is separated, the plurality of rod-shaped members move on the flat portion, so that the packaging film containing the packaged object can be supported by the plurality of rod-shaped members, which is stable and smooth. Can be conveyed.

  Further, according to the invention of (3), even if the position of the rotary shaft and thus the end sealer is moved up and down, the movement trajectories of the plurality of rod-shaped members are defined by the trajectories of the groove portions of the fixed groove cam, do not do. Therefore, even if the height of the end seal device is adjusted, it is not necessary to change the transition mechanism including the groove cam, the plate cam, and the rod-shaped member.

  The present invention relates to a rotary end seal device in which a packaging film that encloses an object to be packaged in a end seal device by means of a rod-like member that moves on a flat portion of a groove even when the upper and lower end sealers are not in contact with each other. Supports and can carry smoothly.

  FIG. 1 shows an embodiment of a pillow packaging machine to which the present invention is applied. The pillow wrapping machine 10 is arranged with a to-be-packaged article conveyance supply device 11, a wrapping machine body 12, and a carry-out conveyor device 13 in order from the upstream side.

  The packaged article transport and supply device 11 is configured by a finger conveyor device to convey the packaged article 14 at regular intervals and sequentially supply the packaged article 14 to the packaging machine body 12 at the next stage. That is, the push finger 17 is attached to the endless chain 16 spanned between the sprockets 15 arranged at the front and rear at regular intervals. Then, by supplying the article to be packaged 14 between the front and rear push fingers 17, the article to be packaged 14 is conveyed at the finger pitch of the push fingers 17.

  The packaging machine main body 12 guides the belt-like film 21 drawn continuously from the raw roll 20 to the bag making machine 24 while passing over various rollers 22 (only one is drawn in the drawing). The belt-shaped film 21 is made to pass through the bag making device 24 to form a bag. In addition, the unloading end of the above-described packaged article transport and supply device 11 is located in the bag making device 24, whereby the packaged article 14 unloaded from the packaged article transport and supply device 11 at predetermined intervals is It is supplied at predetermined intervals into a bag making machine 24 and then into a tubular film 25 which is formed into a tubular shape.

  On the downstream side of the bag making device 24, a conveyance path for the tubular film 25 that encloses the article to be packaged 14 is configured, and a center seal device 27 is disposed at a predetermined position below the conveyance path, and further in the forward direction of the traveling direction. In addition, the conveyor 28 and the end seal device 30 are arranged. The center seal device 27 seals a portion where the side edges of the belt-like film 21 are overlapped, that is, the film polymerization end of the tubular film 25. A restraining belt 29 is disposed above the conveyor 27.

  The end seal device 30 is configured by attaching end sealers 32 and 32 ′ to rotary shafts 31 and 31 ′ arranged vertically, and the pair of end sealers 32 and 32 ′ are rotated in synchronization to form a cylindrical shape. A predetermined portion of the film 25 is sandwiched from above and below, and is sealed and cut. As a result, a predetermined position of the tubular film 25 (portion where the article to be packaged 14 does not exist) is correctly sealed and cut by the end seal device 30, and the leading end portion of the tubular film 25 (part including the leading article 14 to be packaged) ) Are separated to produce the package 26. Then, the package 26 is conveyed on the carry-out conveyor device 13.

  Next, a preferred embodiment of the end seal device according to the present invention will be described. As described above, the rotary end seal device 30 is installed at a predetermined position on the downstream side of the pillow packaging machine, and seals and cuts a predetermined position of the tubular film 25. As shown in FIGS. 2 and 3, a pair of upper and lower rotary shafts 31, 31 ′ is connected to a gear 34 at one end, and the gears 34 are engaged with each other. As a result, the pair of rotating shafts 31 and 31 ′ are rotated in synchronization with each other, and the end sealers 32 and 32 ′ come into contact with each other and sandwich the tubular film 25. One gear 34 is linked to a drive motor (servo motor) 36 via a power transmission mechanism 35 and is driven to rotate at a predetermined timing.

  The upper and lower rotary shafts 31, 31 ′ are supported by the machine frame 37. A screw shaft 38 extending downward is connected to the center of the lower surface of the bottom plate 37 a of the machine frame 37. On the other hand, a cylindrical shaft 41 is erected on the upper surface of the main body frame 40. Two cylindrical shafts 41 are arranged at a predetermined interval, and connecting plates 42 and 43 are provided on the upper and lower sides so as to connect the two cylindrical shafts 41. The screw shaft 38 is inserted into the through hole 42 a provided in the upper connecting plate 42. An annular rotating screw member 45 is supported by bearings at the center of the upper surface of the lower connecting plate 43. The rotating screw member 45 is provided with a screw portion that meshes with the screw shaft 38 on the inner peripheral surface. As a result, when the rotating screw member 45 rotates forward and backward, the screw shaft 38 and the machine frame 37 are moved up and down. That is, the upper and lower rotary shafts 31, 31 'and the end sealers 32, 32' move up and down together.

  And the drive source for this raising / lowering movement is made by the user. That is, a thread portion is also provided on the outer peripheral surface of the rotating screw member 45, and the adjustment handle 47 is attached to one end of the shaft 46 on which a gear (not shown) that meshes with the thread portion is mounted. The shaft 46 is supported at both ends by a bearing plate 48 provided on the cylindrical shaft 41. Therefore, when the adjustment handle 47 is rotated forward and backward, the rotating screw member 45 rotates forward and backward, and the screw shaft 38 moves up and down following the rotation.

  Further, connecting rods 49 are attached near both ends of the lower surface of the bottom plate 37 a of the machine frame 37. The connecting rod 49 is set so as to penetrate the cylindrical shaft 41 and have a lower end protruding below the main body frame 40. A motor mounting base 50 is connected to the lower end of the connecting rod 49, and the drive motor 36 is attached to the motor mounting base 50. Accordingly, the drive motor 36 also moves up and down following the up and down movement of the machine casing 37.

  Here, in the present invention, the crossing device constituted by the groove cam, the plate cam, and the rod-shaped member is incorporated in the end seal device 30. That is, the fixed base 51 is installed on the upper surface of the upper connecting plate 42 via the two support columns 50. The fixed base 51 includes a bottom plate 51a connected so as to straddle the pair of support columns 50, and side walls 51b formed upright at both ends of the upper surface of the bottom plate 51a. A groove cam 52 is provided on the inner surface side of the both side walls 51b. The groove cam 52 is a flat groove cam, and the locus of the groove portion 52a provided on the opposite surface of both groove cams 52 is endless, and as shown in FIG. 28 and a carrying surface of the carry-out conveyor device 13) are provided at substantially the same position or slightly lower, and a horizontally extending portion is provided, and the other portions are substantially arc-shaped. Then, both ends of a plurality of round bars 55 are inserted and disposed in both groove portions 52a. As a result, the plurality of round bars 55 can revolve along the trajectory of the groove 52 a formed in the groove cam 52.

  Further, a through hole is formed at the center position of the groove cam 52, and further, a through hole is also formed at a portion corresponding to the through hole of the groove cam 52 on the side wall 51b to which the groove cam 52 is attached. And it sets so that the lower rotating shaft 31 may be inserted in both the through-holes. The dimension and shape of these through holes are set larger than the outer diameter of the rotating shaft 31. The dimensional shape of the through hole formed in the groove cam 52 and the dimensional shape of the through hole formed in the side wall 51b may be the same or different. In either case, the axes of the through holes may or may not be aligned. The point is that both ends of the lower rotating shaft 31 protrude through the through holes to the outside of the fixed base 51 and are supported by the machine frame 37 as bearings.

  Furthermore, in this embodiment, since the size and shape of the through hole is made larger than the outer diameter of the rotary shaft 31, when the adjustment handle 47 is rotated forward and backward to raise and lower the machine frame 37, the rotary shaft 31 follows it. However, even if such up-and-down movement is performed, the through-hole is not contacted, and the up-and-down movement is allowed. Since the groove cam 52 is fixed to the side wall 51b of the fixing base 51 linked to the main body frame 40 with screws, it does not move in the vertical direction.

  On the other hand, the lower rotary shaft 31 is integrally formed with a flange portion 56 protruding radially outward at a position near the side wall 51b, and a plate cam 54 is fixed to the outside of the flange portion 56 with screws. ing. The plate cam 54 has a substantially disk shape, and has a shape (fan shape with a large central angle) in which a portion facing the end sealer 32 is cut out, and extends from the outer peripheral circle of the plate cam 54 toward the center. A plurality of cut portions 54a are formed. A portion of the flange portion 56 corresponding to the cut portion 54a is also formed with a cut portion. The width of the cut portion 54a is set to be approximately equal to or slightly wider than the diameter of the round bar 55. Further, the outer peripheral edge of the plate cam 54 is set so as to be located outside the outer periphery of the groove cam 52 (at least the locus of the groove 52a). The groove cam 52 and the plate cam 54 are arranged close to each other, and the plurality of round bars 55 passed between the groove cams 52 are set so as to penetrate the notch portion 54. Furthermore, the tip of the cut portion 54 a (the center side of the plate cam 54) is positioned inside the locus (flat portion) of the groove portion 52 a of the groove cam 52.

  Thereby, when the lower rotating shaft 31 rotates, the plate cam 54 also rotates integrally therewith. Then, the round bar 55 that penetrates the cut portion 54 a of the plate cam 54 revolves with the rotation of the plate cam 54. At this time, along the trajectory of the groove portion 52a of the groove cam 52 into which both ends of the round bar 55 are inserted, the round bar 55 appropriately reciprocates within the cut portion 54a while revolving.

  4A, the upper and lower end sealers 32 and 32 'sandwich the cylindrical film, cut the seal, and manufacture the package. When ′ rotates, it passes through FIGS. 4B to 4D and reaches a position where the end sealers 32 and 32 ′ shown in FIG. While the end sealers 32 and 32 ′ are separated from each other and rotate once, a plurality of round bars 55 are present in the flat portion of the groove 52 a in the space between the front and rear conveyors 28 and 13. The plane connecting the plurality of round bars 55 existing in the portion is made to substantially coincide with the transport surfaces of the front and rear conveyors 28 and 13.

  Further, since the flat portion of the groove 52a and the carry-out conveyor device 13 are brought close to each other, and the connecting plate 60 is disposed between the flat portion and the transfer conveyor 28, the transfer surface of the transfer conveyor 28 → the transfer plate 60 → Conveying surface formed by a plurality of round bars 55 present in the flat portion of the groove 52 → The conveying surfaces of the carry-out conveyor device 13 are located in substantially the same plane, and the conveying surfaces adjacent to the front and rear are Since they are close to each other, the cylindrical films containing the items to be packaged are smoothly transported by sequentially crossing their transport surfaces.

  In particular, a transport surface composed of a plurality of round bars 55 is formed between the front and rear conveyors 28 and 13 of the end seal device 30, so that the cylindrical film 25 (the package 14) is supported by the surface. And go straight in the horizontal direction.

  Further, in this embodiment, the movement trajectory of the plurality of round bars 55 is uniquely defined by the trajectory of the groove portion 52a of the groove cam 52 that is a fixed system, so that even if the rotary shaft 31 (end sealer 32) is moved up and down. The position of the transport surface does not change. Therefore, the position in the height direction where the end sealers 32 and 32 ′ are in contact with the end seal device 30 can be easily changed / adjusted according to the height of the package. In the case of a type using a conventional cylindrical guide cover, when the rotary shaft is moved up and down, the guide cover also moves up and down accordingly, so that the uppermost position of the guide cover changes. Therefore, it is necessary to change the guide cover to another size in accordance with the change in the height of the end seal device, which is complicated.

  Further, in the present embodiment, a part of the groove cam 52 can be separated and removed. As shown in FIG. 5, the part 52b that can be removed allows the groove 52a to be divided and opened. Thus, by removing the component 52b, the groove 52a is opened, and the round bar 55 can be easily taken out from the opened portion, and repair, cleaning, and the like can be easily performed.

It is a figure which shows one form of the pillow packaging machine which is an example of the packaging machine with which the end seal apparatus of this invention is applied. It is a front view which shows an end seal apparatus. It is a side view which shows an end seal apparatus. It is a figure explaining an effect | action. It is a figure explaining an effect | action.

Explanation of symbols

30 End seal device 31, 31 ′ Rotating shaft 32, 32 ′ End sealer 52 Groove cam 52 a Groove portion 54 Plate cam 54 a Cut portion 55 Round bar (bar-shaped member)

Claims (3)

In an end seal device including a pair of rotating shafts and an end sealer connected to the pair of rotating shafts,
A pair of groove cams arranged so that both ends of the lower rotating shaft pass through each;
A plate cam disposed opposite to the inside of the groove cam and rotating together with the lower rotating shaft;
A plurality of rod-shaped members linked to the groove portions provided in the pair of groove cams and movable along the locus of the groove portions;
With
The groove portion formed in the groove cam is endless, and at least the uppermost portion is formed flat,
The plate cam is provided with a plurality of strip-shaped guide portions extending radially, and the guide portion penetrates in the thickness direction of the plate cam, and the rod-like member is inserted into each of the penetrated guide portions. Configured ,
A part of the groove cam can be separated and removed, and when the part is removed, the groove is opened, and the rod-shaped member can be taken out from the opened part. An end seal device.   The end seal device according to claim 1, wherein the guide portion is a cut portion extending from the outer peripheral edge of the plate cam toward the center.   The end seal device according to claim 1 or 2, further comprising a mechanism for moving the upper and lower rotary shafts up and down in a vertical direction with the groove cam fixed.

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