JP4405840B2 - End seal device - Google Patents

Description

  The present invention relates to an end seal device.

  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, as shown in FIG. 1, end sealers 3 are attached to rotating shafts 2 that are opposed to each other above and below a film 1 that is conveyed. At this time, the peripheral surfaces meshing with each other at the tips of the end sealer 3 become the seal surface 3a, and the seal surfaces 3a of the end sealers 3 arranged above and below are in contact with each other so as to sandwich the film 1. And since the heater is incorporated in the end sealer 3, the film 1 is heated and melted by sandwiching the film 1, thereby being heat-sealed and sealed.

Further, a cutter blade 4 and a receiving blade 5 are built in the opposing surfaces of both end sealers 3, and the film 1 is simultaneously cut in the lateral direction by sandwiching the film between the cutter blade 4 and the receiving blade 5. ing. The cutter blade 4 and the receiving blade 5 are attached to a groove portion 3b formed at the center position in the longitudinal direction of the seal surface 3a of the end sealer 3. Examples of this type of rotary end seal device include Patent Documents 1, 2, and 3.
JP 2000-85723 A JP 2000-177715 A Japanese Patent Laid-Open No. 10-316114

  However, the above-described conventional end seal device has the following problems. In other words, in the example shown in FIG. 1, the tip of the receiving blade 5 is set at a position lower than the sealing surface 3a of the end sealer 3, but the receiving blade 5 depends on the thickness or material of the tubular film. It is necessary to adjust the tip position. That is, the tip position of the receiving blade 5 may be made equal to the seal surface 3a or may protrude in the opposite direction, and the amount of displacement of the receiving blade 5 from the seal surface 3a needs to be adjusted. In order to perform such adjustment, conventionally, the receiving blade 5 is mounted in a state where a rod-shaped adjusting member having a predetermined thickness for adjusting the amount of displacement is inserted into the back side of the groove portion 3b. A plurality of adjusting members having different thicknesses are prepared, and the amount of displacement of the receiving blade 5 is adjusted by mounting an adjusting member having a desired thickness according to the situation.

  Therefore, a plurality of adjusting members having different thicknesses are prepared and stored, which is complicated. In addition, the adjustable amount of displacement corresponds to the difference in the thickness of the prepared plurality of adjusting members, and therefore the amount of adjustable displacement decreases as the number of prepared members decreases. To complete the fine adjustment, it is necessary to prepare more adjustment members, which increases the cost for storage, and even if a large number of adjustment members are prepared, in any case, only stepwise adjustment is possible. .

  The present invention has been made in view of the above-described background, and an object of the present invention is to provide an end seal device that can accurately adjust the amount of displacement of the receiving blade.

  In order to achieve the above object, an end seal device according to the present invention includes a pair of rotating shafts and end sealers respectively connected to the pair of rotating shafts. A cutter blade having a cutting blade with a sharp tip is attached to the groove portion of one end sealer, a receiving blade is attached to the groove portion of the other end sealer, and the groove portion of the end sealer to which the receiving blade is attached is mounted. The bottom surface is an inclined surface that gradually rises from one end in the longitudinal direction toward the other end, the bottom surface of the receiving blade is an inclined surface that gradually descends from one end to the other in the longitudinal direction, and the receiving blade is It was configured to be movable in the longitudinal direction.

  With this configuration, the receiving blade moves up and down along the inclined surface by moving the receiving blade back and forth in the longitudinal direction. Therefore, the displacement amount with respect to the sealing surface of the end sealer can be continuously changed.

  Preferably, the cutting blade portion is formed so as to be inclined with respect to the longitudinal direction of the cutter blade. As described above, the cutting blade portion is inclined in the longitudinal direction so that the receiving blade and the cutting blade portion do not come into contact with each other at the same time. The film is cut while moving the contacted part. Since the film sandwiched between the cutting blade portion and the receiving blade is always in point contact with a certain point of the cutting blade portion, a large cutting force can be exhibited with a small force.

  In the present invention, the amount of displacement of the receiving blade can be continuously and accurately adjusted.

  FIG. 2 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 front and rear sprockets 15 and 15 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 is configured to guide the belt-like film 21 continuously drawn from the raw fabric roll 20 to the bag making device 24 while passing over various rollers 22, and the belt-like film 21 is transferred to the bag making device 24. By making it pass, a bag is formed into a cylindrical shape. 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 cylindrical film 25 that encloses the article to be packaged 14 is formed, and a center seal device 27 is disposed at a predetermined position of the conveyance path, and the traveling direction thereof. An end seal device 30 is arranged in front. 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.

  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, and the package 29 is manufactured. Then, the package 29 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. 3 and 4, 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. Although not shown, one gear 34 is linked to a drive motor via a power transmission mechanism and is driven to rotate at a predetermined timing.

  The pair of end sealers 32 and 32 'are formed with arcuate seal surfaces 32a and 32a' at their tips, and the central portions of the seal surfaces 32a and 32a 'are laterally transverse grooves 32b and 32b'. Is formed. The cutter blade 35 is mounted in the groove portion 32b of the upper end sealer 32, and the receiving blade 36 is mounted in the groove portion 32b 'of the lower end sealer 32'.

  Here, in this embodiment, as shown in FIGS. 5 and 6, the cutting blade portion 37 (pointed portion) formed at the tip of the cutter blade 35 is moved in the traveling direction of the cylindrical film (in the direction of the arrow in the figure). ) To be inclined with respect to. In other words, the cutter blade 35 has the front and rear surfaces on one end side of the rectangular body as inclined surfaces 38a and 38b, so that the tip portion formed by the intersection of the front inclined surface 38a and the rear inclined surface 38b is a cutting blade. Part 37. At this time, the front inclined surface 38 a and the rear inclined surface 38 b are formed so as to be inclined in both the longitudinal direction and the short direction of the main body of the cutter blade 35. Thus, as is apparent from the figure, the inclined surfaces 38a and 38b gradually change (enlarge and contract) as the formation area advances from one end to the other end in the longitudinal direction. The cutting blade portion 37 formed at the leading edge where the 38 b intersects is also inclined at a predetermined angle with respect to the longitudinal center line of the cutter blade 35.

  Thereby, since the cutter blade 35 is mounted in the groove portion 32b of the upper end sealer 32, the groove portion 32b is orthogonal to the traveling direction of the tubular film, so that the cutting blade portion 37 is in the traveling direction of the tubular film (in the drawing, It is in a state inclined with respect to the arrow direction.

  7 and 8, the cutter blade 35 having the above-mentioned shape is mounted on the upper end sealer 32, and the end seal device 30 is operated with the receiving blade 36 mounted on the lower end sealer 32 '. The state of the said blades 35 and 36 of the state which the both blades 35 and 36 contacted is shown. The receiving blade 36 has the same shape as that of the prior art, and its tip surface 36a has a substantially arc shape. And since the cutting blade part 37 of the front-end | tip of the cutter blade 35 inclines with respect to the advancing direction (arrow direction in a figure) of a cylindrical film, it is with respect to the circular-arc-shaped front end surface 36a of the receiving blade 36. The entire cutting blade portion 37 cannot contact at a time, and a predetermined position of the cutting blade portion 37 makes point contact with the receiving blade 36 in accordance with the rotation angle of both end sealers 33 and 32 ′.

  In FIG. 9, a two-dot chain line is a contact portion of the cutting blade portion 37 on the sealing surface of the receiving blade 36. As shown in FIGS. 10A to 10C, as the end sealers 32 and 32 ′ rotate, the cutting blade portion 37 comes into contact with the receiving blade 36 sequentially from the preceding portion. It gradually moves from one end (right side in the figure) to the other end (left side in the figure) of the receiving blade 36 at the contact portion of the cutting blade part 37 and the receiving blade 36 indicated by the chain line. Thus, since the cutting blade portion 37 and the receiving blade 36 of the cutter blade 35 are in point contact, a large force is applied to the cylindrical film sandwiched between the two, and cutting is performed while pulling along the two-dot chain line. Since the force acts as if it is, the cylindrical film can be easily cut.

  Here, in the present invention, as shown in FIGS. 11 to 13 and the like, the bottom surface 32c ′ of the groove 32b ′ of the end sealer 32 ′ to which the receiving blade 36 is attached and the bottom surface 36b side of the receiving blade 36 are gradually increased along the longitudinal direction. The longitudinal dimension of the receiving blade 36 is set to be longer than the longitudinal dimension of the end sealer 32 '. Further, the receiving blade 36 is attached to the groove 32b 'so as to be movable in the longitudinal direction.

  Accordingly, as shown in FIGS. 11 to 13, by moving the receiving blade 36 in the longitudinal direction, the receiving blade 36 moves up and down along the inclined surface of the bottom surface 32c ′ of the groove 32b ′. Since the bottom surface 36a of the receiving blade 36 is also matched with the inclination angle of the bottom surface 32c ', the sealing surface 36a of the receiving blade 36 can be moved up and down while maintaining a horizontal state. Moreover, since the position of the tip surface 36a of the receiving blade 36 can be moved up and down continuously, the amount of displacement of the end sealer 32 'relative to the seal surface 32a' can also be adjusted continuously.

  Furthermore, in this embodiment, since the memory 40 is provided on the side surface of the receiving blade 36, the value of the displacement amount can be easily adjusted by looking at the positional relationship between the memory 40 and the side edge of the end sealer 32 '. It becomes. When the receiving blade 36 is slid in the longitudinal direction and set at a desired height position, the receiving blade 36 is fixed by tightening the fixing screw 42. The fixing screw 42 has a tip abutting against the receiving blade 36. When the fixing screw 42 is loosened, the fixing blade 42 is separated from the receiving blade 36 so that the receiving blade 36 is in a free state. And press against the side surface of the groove 32b 'to fix. Of course, the fixing method is not limited to this, and any means can be taken.

  In the above-described embodiment, the cutting blade portion 37 of the cutter blade 35 is inclined with respect to the longitudinal direction. However, the present invention is not limited to this, and the conventional cutting blade portion is a cutter blade. A type arranged in parallel with the longitudinal direction of 35 is also applicable.

It is a figure which shows a prior art example. 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 perspective view showing one embodiment of an end seal device. It is a side view showing one embodiment of an end seal device. It is a perspective view which shows a cutter blade. 5A is a plan view in the state of FIG. 5 (bottom view in use), FIG. 5B is a front view thereof, and FIG. 5C is a side view thereof. It is a perspective view which shows a cutter blade and a receiving blade. (A) is the front view in the state of FIG. 7, (b) is the side view. It is a figure explaining an effect. It is a figure explaining an effect. It is a figure which shows the principal part structure of this invention. It is a figure which shows the principal part structure of this invention. It is a figure which shows the principal part structure of this invention.

Explanation of symbols

30 End seal device 31, 31 ′ Rotating shaft 32, 32 ′ End sealer 32 a, 32 a ′ Seal surface 32 b, 32 b ′ Groove 32 c ′ Bottom surface 34 Gear 35 Cutter blade 36 Receiving blade 36 a Tip surface 36 b Bottom surface 37 Cutting blade portion

Claims (2)

In an end seal device comprising a pair of rotating shafts and an end sealer connected to each of the pair of rotating shafts,
A cutter blade having a cutting blade with a sharp tip is attached to the groove portion of one end sealer of the pair of end sealers, and a receiving blade is attached to the groove portion of the other end sealer,
The bottom surface of the groove portion of the end sealer to which the receiving blade is mounted is an inclined surface that gradually rises from one end to the other in the longitudinal direction,
The bottom surface of the receiving blade is an inclined surface that gradually descends from one end to the other in the longitudinal direction,
The end seal device characterized in that the receiving blade is movable in the longitudinal direction.   The end seal device according to claim 1, wherein the cutting blade portion is formed to be inclined with respect to a longitudinal direction of the cutter blade.

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