JP2008068886A - Packaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable heat-welding section without holes or cobwebbing in a packaging apparatus which performs the packaging while pulling out a resin film sheet by the movement of an article to be packaged. <P>SOLUTION: In the packaging apparatus, a lateral sealing heater is brought into contact with a resin film sheet 3, and heat-welding is performed. Then, by a feeding-returning mechanism which is arranged on the upstream side of the lateral sealing heater, the resin film sheet is fed to the downstream side for once time at the upstream side of the heat-welding section, and a slack is formed. Then, the resin film sheet is pulled back to the upstream side by the feeding-returning mechanism 31, and thus, the slack is eliminated, and at the same time, the resin film sheet is cut at the heat-welding section. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging device for covering a flat packaged article with a resin film sheet and packaging the resin film sheet by heat welding around the packaged article.

  A sheet of resin film is folded around the left and right sides of a packaged object having a flat shape such as paper, booklet, envelope, newspaper, etc., and the side edges of the resin film sheet are placed on one side of the packaged object. A package body in which overlapping folded portions are formed and a resin film sheet is thermally sealed before and after the article to be packaged and closed is often used for physical distribution, mailing, and the like.

  FIG. 4 is a view showing an example of such a package. In a package 101 shown in FIG. 4, a flat-shaped article 2 is wrapped with a resin film sheet 3. The resin film sheet 3 has a front end side welded portion 3a and a rear end side welded portion 3b that are heat-welded, and a folded portion 3e in which the vicinity of the left side end 3c and the vicinity of the right side end 3d overlap each other. Yes. Further, a longitudinal seal portion 3g is provided at a substantially central portion in the front-rear direction of the folding portion 3e, and the resin film sheet is thermally welded also in the longitudinal seal portion 3g.

  FIG. 5 is a front view showing an example of a packaging apparatus 201 of the background art for creating such a package 101, and FIG. 6 is a side view thereof. The resin film sheet 3 is supplied from the film roll 22, and the resin film sheet 3 is sent along the molding plate 23 to be molded into a cylindrical shape.

  FIG. 7 is a view showing the structure of the film forming plate 23. A plate having a shape as shown in FIG. 7A (preferably a metal plate whose surface is slippery) is bent along the left and right dotted lines, and the right side is first bent approximately 180 degrees, and then the left side is slightly spaced. It is bent approximately 180 degrees so as to overlap with each other, and is as shown in (c). (B) is the figure which looked at (c) from the upper part, (d) is the figure which looked at (c) from the lower part.

  With respect to such a structure, when the resin film sheet 3 is inserted into the opening 23a of (c) from the back side of (c), it becomes as shown in FIG. 8, and when drawn downward, the resin film sheet 3 is as shown in (c). The left and right amount side ends 3c and 3d are formed in a cylindrical shape by forming a folded portion 3e that overlaps at the front center portion. When the lower end of the cylindrical resin film sheet 3 folded in this way is heat-sealed and closed, it becomes a bag shape. Here, when the article to be packaged 2 is inserted through the opening 23a, the article is inserted into the bottom of the cylindrical resin film sheet 3.

  Accordingly, in FIGS. 6 and 7, the cylindrical resin film sheet 3 is suspended from the film forming plate 23, and when the article 2 to be packaged is inserted into the insertion port 23 a from above, it enters the inside of the cylindrical shape. Become.

  Below the film forming plate 23, a vertical sealing means 24 for forming a vertical sealing portion 3g, a driving roller 232 that sandwiches a resin film or a transported object covered with a resin film and feeds it downward from above, a pressing driven roller A lateral seal means 39 is provided to form a feed mechanism 231 including the 233, the front end side weld portion 3a, and the rear end side weld portion 3b. Further, a first sensor 46 is provided on the upstream side (hereinafter simply referred to as upstream) of the lateral seal means in the direction of movement of the package, and a second sensor 47 is provided on the downstream side so that the passage of the package 2 can be detected. It has become. Further, a controller 248 for driving and controlling the vertical sealing means 24, the feeding mechanism 231 and the horizontal sealing means 39 is provided according to the detection results of these sensors.

When the article to be packaged 2 is put into the molding plate 23 from above, the article to be packaged 2 is inserted inside the resin film sheet 3 formed into a cylindrical shape. Since the lower end of the resin film sheet 3 has already been heat-welded and closed in the previous packaging operation to form the bottom, the front end of the package 2 reaches this bottom and stops as shown in FIG. To do. Here, when the front end of the article to be packaged 2 is detected by the first sensor 46, the vertical seal heater 25 is pressed against the resin film sheet 3 (FIG. 9B) to form a vertical seal portion. Next, the package 2 is fed downward together with the resin film sheet 3 by the feed mechanism 231 (FIG. 9C), and when the rear end of the package 2 is detected by the second sensor 47, the feed is temporarily stopped. Then, heat welding is performed on the rear end side of the article to be packaged 2 by the horizontal sealing means 39 (FIG. 9D). Thereafter, the resin film sheet 3 above the heat-welded portion is pulled upward by the feeding mechanism 231 and the resin film sheet 3 is cut at the heat-welded portion (FIG. 9 (e)). The article 2 to be packaged packaged in the resin film sheet 3 falls downward. Such a packaging device 201 is shown in Patent Document 1 already filed by the present applicant.
Japanese Patent Application No. 2005-251212 (FIGS. 5, 6, 10, 11, 14 and others)

  However, in the packaging apparatus 201 of this background art, the packaged material is put into the resin film sheet that has been welded at the tip to form a bag, and the resin film sheet 3 is pulled out by the movement of the packaged product, and thus packaged. The sheet 3 is not slackened due to its drawing resistance. Further, the resin film sheet 3 is sandwiched by the feed mechanism 31 on the upstream side of the horizontal seal heater. Therefore, when the horizontal seal heater 25 is pressed against the resin film sheet 3 at the time of heat welding and the resin film sheet 3 is pushed by the tip of the horizontal seal heater 25 and moves to the heater receiver 49 side, the package of the horizontal seal heater 25 is packed. Tension is applied to the resin film sheet 3 on the upstream side in the movement direction (hereinafter simply referred to as upstream side). Therefore, when the resin film sheet 3 is thin or has a low melting temperature, the portion on the upstream side of the horizontal seal heater 25 is not sufficiently thermally welded, and the resin that has been melted at the time of cutting pulls the yarn. In some cases, the film tip after cutting is poorly sealed. Even if the holding by the feed mechanism 31 is released at the time of welding by the horizontal seal heater 25, the tension is applied by the drawing resistance caused by drawing the resin film sheet from the film supply source on the upstream side of the feed mechanism 31, so the same phenomenon occurs. It sometimes occurred.

  The present invention has been made in view of such problems, and in a packaging apparatus for packaging while pulling out a resin film sheet by moving a packaged article, a packaging capable of obtaining a stable heat-welded portion without holes or stringing is obtained. An object is to provide an apparatus.

  The first configuration of the present invention for solving the above problem is to cover a flat packaged article with a resin film sheet having a welded tip, and move the packaged article together with the resin film sheet while packaging the packaged article. A packaging device for thermally welding and cutting and packaging a resin film sheet on the rear end side thereof, provided so as to be capable of contacting and separating from the resin film sheet, and contacting the resin film sheet on the rear end side of the package The horizontal seal heater that is heat-welded and the upstream side of the horizontal seal heater in the direction of movement of the package, the resin film sheet can be sent downstream in the direction of movement of the package, and can be pulled back upstream in the direction of movement of the package And a control means for controlling the lateral seal heater and the feed / return mechanism. The control means contacts the lateral seal heater with the resin film sheet. Then, the resin film sheet is sent to the downstream side in the package moving direction by the feed / return mechanism to form the slack, and then the feed / return mechanism is formed. By pulling back the resin film sheet to the upstream side in the direction of movement of the package, the packaging device is characterized by controlling the lateral seal heater and the feed / return mechanism so as to eliminate the slack and to cut at the heat welded portion. It is.

  In addition to the first configuration, the second configuration of the present invention has a heater receiver provided along the movement path of the packaged object, and the horizontal seal heater advances toward the heater receiver. A packaging apparatus characterized in that a resin film sheet is thermally welded by sandwiching the resin film sheet between a horizontal seal heater and a receiver.

  In the third configuration of the present invention, in addition to the first or second configuration, a resin film roll from which the resin film sheet is pulled out is provided, and the resin film sheet moves downstream in the package moving direction together with the package. The packaging apparatus according to claim 1, wherein the resin film sheet is pulled out from the resin film roll.

  According to a fourth configuration of the present invention, in addition to the first to third configurations, an input port for inputting an object to be packaged is formed on the upstream side of the feed / return mechanism, and an object to be packaged input from the input port It is a packaging apparatus characterized by having a shaping | molding part which shape | molds a resin film sheet so that the circumference | surroundings may be covered with one resin film sheet.

  According to this first configuration, the control means causes the lateral seal heater to contact the resin film sheet and thermally weld it, and then moves the resin film sheet to the package upstream of the heat welding portion by the feed / return mechanism. It is cut after releasing the tension generated on the upstream side of the heat-welded part by sending it to the downstream side in the direction (hereinafter simply referred to as the downstream side) to form a slack, so that stable heat is also generated on the upstream side of the horizontal seal heater. Welding can be performed.

  Further, in the second configuration of the present invention, since the horizontal seal heater advances to the heater receiver provided along the movement path of the packaged article, the resin film sheet moves to the heater receiver side. The resin film sheet is likely to be tensioned during this movement. However, once the slack is formed in the resin film sheet before cutting, the tension can be eliminated, so that stable heat welding can be obtained, and the heater receiver is fixed along the movement path of the package. Since it only has to be allowed to do, the configuration of the apparatus becomes simple.

  Furthermore, the 3rd structure of this invention is a packaging apparatus with which the resin film roll from which a resin film sheet is pulled out is provided, and a resin film sheet is pulled out from a resin film roll by the movement of a to-be-packaged object. Therefore, even if the holding of the film by the feed / return mechanism is released at the time of heat welding, the resin film sheet is tensioned by the rotational resistance of the resin film roll. However, once the slack is formed in the resin film sheet before cutting, the tension can be eliminated, so in addition to obtaining stable thermal welding, a large-diameter film roll with high pulling resistance should also be applied. Therefore, the frequency of film roll exchange is reduced and the usability is improved.

  Further, according to a fourth configuration of the present invention, an inlet for feeding an article to be packaged is formed on the upstream side of the feed / return mechanism, and a single resin film sheet surrounds the article to be packaged fed from the inlet. It is a packaging apparatus which has a shaping | molding part which shape | molds a resin film sheet so that it may cover. In this configuration, when the resin film sheet is pulled out by the movement of the article to be packaged, the resin film sheet is folded along the plate surface of the molding plate in the pull-out path and formed into a cylindrical shape. Therefore, even if the holding of the film by the feed / return mechanism is released at the time of heat welding, the resin film sheet is subjected to tension due to frictional resistance or the like with the molding plate. However, once the slack is formed in the resin film sheet before cutting, the tension can be eliminated, so that stable thermal welding can be obtained, and one resin film sheet can be formed into a cylindrical shape with a simple configuration. Can be formed.

  Therefore, according to the present invention, there is an effect that a packaging apparatus capable of performing stable thermal welding without holes or stringing can be obtained in a packaging apparatus that thermally welds and cuts a resin film sheet that covers an object to be packaged. .

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. In addition, the same code | symbol shall be used for the member and part which have the same shape and function as the packaging apparatus 201 of background art.

  FIG. 1 is a front view showing a packaging device 1 of the present invention, and FIG. 2 is a side view thereof. One film roll 22 is rotatably supported above the apparatus, and one strip-shaped resin film sheet 3 is supplied from the film roll 22. A film forming plate 23 is provided on the left side of the film roll 22 in FIG. 2, and an inlet 23 a is formed above the film forming plate 23, so that the resin film sheet 3 extends along the film forming plate 23. By being sent, it is formed into a cylindrical shape. The process of forming into a cylindrical shape is the same as the forming process in the background art already described with reference to FIGS.

  A vertical sealing means 24 is provided below the film forming plate 23. The vertical seal means 24 is provided with a plate-shaped vertical seal heater 25 whose longitudinal direction is the vertical direction. The vertical seal heater 25 is attached to an attachment plate 26 that is formed long in the width direction, and is fixed to one end of a drive rod 27 at both left and right ends of the attachment plate 26. The drive rod 27 is supported by a rod receiver 28, and the other end side is connected to a crank mechanism 29. By driving the crank mechanism 29 by the drive shaft 30, the drive rod 27 is reciprocated in the direction of arrow A shown in FIG. 3, and the vertical seal heater 25 is brought into contact with or separated from the resin film sheet 3. A driving force is applied to the drive shaft 30 from the motor M1.

  A feed / return mechanism 31 is provided below the vertical sealing means 24. The feed / return mechanism 31 is provided with a driving roller 32 to which a driving force is applied from the motor M2 and a pressing driven roller 33 provided so as to be able to contact and separate from the driving roller 32. The pressing driven roller 33 is rotatably supported by a shaft 34, and the shaft 34 is fixed to one end of a drive rod 35 at both left and right ends thereof. The drive rod 35 is supported by a rod receiver 36, and the other end side is connected to a crank mechanism 37. By driving the crank mechanism 37 by the drive shaft 38, the drive rod 35 is reciprocated in the direction of arrow B shown in FIG. When the pressing driven roller 33 moves in a direction approaching the driving roller 32 by this reciprocating movement, the pressing object roller 33 and the driving roller 32 sandwich the packaged article 2 together with the resin film sheet 3 that encloses it, upward or downward. Transport. A driving force is applied to the driving shaft 38 from the motor M3.

  A horizontal seal means 39 is provided below the feed / return mechanism 31. The horizontal sealing means 39 is provided with a horizontal sealing heater 40 longer than the entire width of the cylindrical resin film sheet 3. The horizontal seal heater 40 is attached to a mounting plate 41 that is formed long in the width direction, and is fixed to a pair of side plates 42 at both left and right ends of the mounting plate 41. By reciprocating the side plate 42 in the direction of arrow C shown in FIG. 3 by the slide mechanism 43 and the crank mechanism 44, the lateral seal heater 40 is brought into contact with or separated from the resin film sheet 3. The crank mechanism 44 is driven by a drive shaft 45, and a driving force is applied to the drive shaft 45 from a motor M4. A heater receiver 49 is provided facing the lateral seal heater 40 across the passage of the resin film sheet 3. The resin film sheet 3 is sandwiched between the horizontal seal heater 40 and the heater receiver 49 and thermally welded.

  A first sensor 46 is provided on the upstream side of the horizontal sealing means 39, and a second sensor 47 is provided on the downstream side. The first sensor 46 and the second sensor 47 are optical sensors provided opposite to each other with the passage of the article to be packaged 2 and the resin film sheet 3 interposed therebetween, and can detect the passage of the article to be packaged 2 respectively. It has become. Furthermore, a controller 48 that drives and controls the motors M1, M2, M3, and M4 is provided according to the detection results of these sensors. Further, heating means and thermistor (not shown) are affixed to the vertical seal heater 25 and the horizontal seal heater 40, and the heating means and the thermistor are connected to the controller 48. The controller 48 also displays the measurement temperature result of this thermistor. In addition, the heating means is controlled so that the heater has a temperature suitable for the thermal welding of the resin film sheet 3.

  A discharge port 51 is formed below the lateral seal means 39 toward the housing bottom surface 61 side. The discharge port 51 is provided at a position close to one end (the left end in FIG. 2) of the apparatus housing. When the article 2 to be packaged covered with the resin film sheet 3 is sent downward by the feed / return mechanism 31, it protrudes from the lower part of the casing through the discharge port 51 and is cut at the heat welded part to complete the packaging 101. And falls downward.

  A receiving plate 71 (receiving member) is provided below the discharge port 51. The receiving plate 71 is attached to the bottom surface 61 of the casing 51 on the other end side (right side in FIG. 2) of the discharge port 51 so as to receive the package 101 that has dropped from the discharge port 51.

  Next, operation | movement of this packaging apparatus 1 is demonstrated with reference to FIG. First, the article to be packaged 2 is loaded from the upper opening 23a. Then, the article to be packaged 2 is inserted inside the resin film sheet 3 formed into a cylindrical shape. Since the front end (lower end in FIG. 3) of the resin film sheet 3 has already been heat-welded and closed in the previous packaging operation to form the bottom, the front end of the package 2 is shown in FIG. 3 (a). It reaches this bottom and stops.

  Here, the front end of the article to be packaged 2 is detected by the first sensor 46. Then, the motor M1 is driven, and the vertical seal heater 25 is pressed against the folding portion 3e of the resin film sheet 3 as shown in FIG.

  Next, the motors M2 and M3 are driven to rotate the driving roller 32 in the counterclockwise direction in FIG. 3 as shown in FIG. 3C, and the pressing driven roller 33 is pressed against the article 2 and the resin film sheet 3. The article to be packaged 2 is conveyed downward together with the resin film sheet 3. Then, as shown in FIG. 3D, when the rear end of the article to be packaged 2 is detected by the second sensor 47, the drive roller 32 is temporarily stopped, the motor M4 is driven, and the lateral seal heater 40 is moved to the article to be packaged. 2 is pressed against the resin film sheet 3 on the rear end side and is heat-sealed by being sandwiched between the heater receiver 49.

  Next, as shown in FIG. 3E, the motor M2 is driven while the lateral seal heater 40 is pressed against the resin film sheet 3 and the heater receiver 49, and the drive roller 32 is rotated counterclockwise in FIG. The film sheet is fed out by a feeding length X (not shown). Then, the resin film sheet 3 forms a slack SL above the side seal heater 40 (upstream side). The feed length X is used to eliminate the tension on the upstream side of the horizontal seal heater 40 and to form a minute slack SL that does not contact the horizontal seal heater 40 with a portion other than the welded portion of the resin film sheet 3. There is a length required.

  Subsequently, the motor M2 is reversely rotated by time t2, and the drive roller 32 is rotationally driven in the clockwise direction in FIG. 3 as shown in FIG. Then, since the resin film sheet 3 is pulled upward by a return length Y (not shown) upstream from the horizontal seal heater 40, the slack SL is eliminated, and the resin film is further removed at the heat welded portion by the horizontal seal heater 40. The sheet is cut. The return length Y is a length necessary for eliminating the slack SL and cutting the welded portion, and is a value larger than the feed length X. Thereafter, when the horizontal seal heater 40 is separated from the resin film sheet 3, the article 2 (packaging body 101) packaged in the resin film sheet 3 falls on the receiving plate 71 and the packaging is completed.

  In the above embodiment, the packaging device having the vertical sealing means has been described, but this vertical sealing means may be omitted. Even if there is no vertical seal, it is possible to form a package, and after the rear end side welding, the resin film sheet is slackened on the upstream side of the horizontal seal heater and the tension is released, so that the discharge port becomes the bottom of the housing The effect of the present invention that eliminates the installation error of the packaging device provided on the side is exhibited regardless of the presence or absence of the vertical sealing means.

It is a front view which shows the packaging apparatus 1 of this invention. It is a side view which shows the packaging apparatus 1 of this invention. It is a figure which shows the packaging operation | movement in the packaging apparatus 1 of this invention. 2 is a perspective view showing a package 101. FIG. It is a front view which shows the packaging apparatus 201 of background art. It is a side view which shows the packaging apparatus 201 of background art. It is the expanded view and structure figure of the film forming board 23 of the packaging apparatus 1 of this invention, and the packaging apparatus 201 of background art. FIG. 4 is a diagram showing a situation where a belt-shaped resin film sheet is formed into a cylindrical shape by a film forming plate 23. It is a figure which shows the packaging operation | movement in the packaging apparatus 201 of background art.

Explanation of symbols

1: Packaging device (present invention)
2; package 3; resin film sheet 22; film roll 23; film forming plate 23a; inlet 24; vertical seal means 25; vertical seal heater 31; feed / return mechanism 32; drive roller 33; Horizontal seal means 40; horizontal seal heater 46; first sensor 47; second sensor 48; controller 49; heater receiver 51; discharge port 71; receiving plate 101;
A, B, C; arrow SL; slack M1, M2, M3, M4; motor X; feed length Y; return length

Claims (4)

  Cover the flat packaged article with the resin film sheet with the tip welded, and move the packaged article together with the resin film sheet, then heat-weld and cut the resin film sheet on the rear end side of the packaged article to package A horizontal sealing heater that is provided so as to be capable of contacting and separating from the resin film sheet and that is thermally welded by contacting the resin film sheet on the rear end side of the packaged object, and the packaging of the horizontal seal heater A feed / return mechanism provided on the upstream side in the object movement direction and capable of feeding the resin film sheet to the downstream side in the package movement direction and capable of being pulled back in the upstream side in the package movement direction, and the lateral seal heater and the feed Control means for controlling the return mechanism, the control means bringing the transverse seal heater into contact with the resin film sheet for thermal welding, and then using the feed / return mechanism. The resin film sheet is sent to the downstream side in the package movement direction at the upstream side in the package movement direction of the heat welding part to form a slack, and then the resin film sheet is moved upstream in the package movement direction by the feed / return mechanism. A packaging device characterized by controlling a lateral seal heater and a feed / return mechanism so as to eliminate slack and to cut at a heat welded portion by pulling back.   In addition to the structure of claim 1, it has a heater receiver provided along the movement path of the article to be packaged, and the horizontal seal heater advances toward the heater receiver and is located between the horizontal seal heater and the receiver. The packaging apparatus according to claim 1, wherein the resin film sheet is thermally welded by sandwiching the resin film sheet.   In addition to the configuration of claim 1 or 2, a resin film roll from which the resin film sheet is drawn is provided, and the resin film sheet moves together with the package to the downstream side in the package moving direction. The packaging device according to claim 1 or 2, wherein the packaging device is pulled out from a resin film roll.   In addition to the constructions of claims 1 to 3, a feed port for feeding the package is formed on the upstream side of the package movement direction of the feed / return mechanism, and the package around the package loaded from the feed port is formed. 4. The packaging apparatus according to claim 1, further comprising a molding part that molds the resin film sheet so as to be covered with one resin film sheet.

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