Heat seal device of filling and packaging machine

In a heat seal device of a filling and packaging machine, wherein a continuously fed film F is vertically sealed by a vertical seal mechanism 19 and the laterally sealed by lateral seal mechanisms 20, 21, contents W, W1, W2 are filled in the film formed in the bottomed cylindrical shape and, while the film F is fed, a portion of the film F which forms a bag opening part side is sealed laterally by the lateral seal mechanisms 20,21 for continuously packaging as pouches P, the vertical seal mechanism 19 comprises a pair of rotating shafts 25 incorporating heaters H and mounted rotatably and two pairs of vertical seal rolls 31, 34 which are mounted in pairs on the rotating shafts 25 with a given distance in the axial direction of the rotating shafts 25 and have seal portions 30,35 protruded in a flange shape around outer peripheral portions thereof respectively, the heaters H incorporated in the rotating shafts 25 are disposed movably along the axial direction of the rotating shafts 25 with the position of the heaters H capable of being adjusted movably relative to the position of two pairs of the vertical seal rolls 31, 34.

TECHNICAL FIELD
 This invention relates to a heat seal device of a filling and packaging
 machine which forms packaging bags from a film wound in a roll shape and
 fills contents made of material in a liquid form, a powdery form or a
 paste form in the packaging bags.
 BACKGROUND OF THE INVENTION
 As a filling and packaging machine for filling and packaging contents made
 of material in a liquid form, a powdery form or a paste form, as disclosed
 in Japanese Laid-open Patent publication HEI 1-153410, Japanese Laid-open
 Patent publication HEI 2-4626 or Japanese Laid-open Patent publication HEI
 2-32929, a machine which folds back a continuously fed film, overlaps both
 folded back end peripheries of the film and vertically seals such end
 peripheries by means of a vertical seal mechanism, fills a content in the
 inside of the vertically sealed film, laterally seals this film by means
 of lateral seal mechanisms so as to form pouches and cuts the central
 portions of the laterally sealed portions by means of a cutter mechanism
 to separate these pouches as single-pack pouches and transfers them or
 alternatively laterally seals the film by means of lateral seal mechanisms
 to form pouches and transfers pouches which are connected in a continuous
 form, and packages these pouches in an accommodating box, is known. One
 example of such a machine is explained in conjunction with FIG. 5.
 In the drawing, numeral 1 indicates a machine base and holder frames 2 are
 disposed at the side portion of the machine base 1. Film rolls R which is
 made of films F wound in a roll form are replaceably mounted on the holder
 frames 2. A film guide portion 3 and a film folding back portion 4 are
 disposed at the upper portion of the machine base 1. To the front surface
 portion of the machine base 1, a vertical seal mechanism 5, a first and
 second lateral seal mechanisms 6, 7, and a cutter mechanism 8 are provided
 in the order from above. The film F is pulled out from one film roll R in
 a roll form and the film F is lead out to the film folding back portion 4
 by way of the film guide portion 3. The film F is folded back in a double
 folded manner along a longitudinal direction by the film folding back
 portion 4. The folded back end peripheral portions of the film F are
 subjected to a heat seal by means of a pair of vertical seal rolls 9 of
 the vertical seal mechanism 5 which face each other in an opposed manner
 and then are fed out. The film F is formed in a cylindrical shape by means
 of this vertical seal portion FH. The film F is heat sealed in a lateral
 direction by means of a pair of lateral seal rolls 10 of the first lateral
 seal mechanism 6 which face each other in an opposed manner so as to form
 bottoms of packing bags by means of these lateral seal portions FS. In the
 inside of the film F formed in a cylindrical shape having the bottom, a
 content W made of a liquid such as sauce is filled. The film F is further
 advanced and the bag opening side of the film F is again laterally sealed
 by means of a pair of lateral seal rolls 10 of the first lateral seal
 mechanism 6 to hermetically fill the content W and this lateral sealed
 portion FS is again hermetically sealed so as to seal three sides of the
 film F thus forming pouches P by means of a pair of lateral seal rolls 10A
 provided to the second lateral seal mechanism 7. Subsequently, the
 intermediate portions of the lateral sealed portions FS which are provided
 for forming the pouches P are cut by the cutter mechanism 8 so as to form
 pouches P in a single-pack form and the pouches are transferred.
 Alternatively, after forming pouches P by laterally sealing the film F by
 means of the lateral seal mechanisms 6, 7, the operation of the cutter
 mechanism 8 is stopped and the pouches P in a continuous-pack form which
 are made of continuously connected pouches P are transferred.
 Furthermore, the above-mentioned pouches P which are formed such that three
 sides thereof are sealed may be formed as shown in FIG. 6, wherein the
 pouch P which is filled with the content W is formed by a vertical sealed
 portion FH which is formed by heat sealing both folded back end portions
 of the film F by means of the vertical seal rolls 9 and the lateral seal
 portions FS which are heat sealed by means of the lateral seal rolls 10,
 10A in a direction perpendicular to the longitudinal direction of the film
 F.
 Furthermore, as shown in FIG. 7, the pouches P may be formed such that four
 sides of the film F are sealed by vertical seal portions FH1, FH2 which
 are formed by respectively heat sealing the folded back end portions and
 the back-like peripheral portion of the film F by means of two vertical
 seal rolls not shown in drawings and lateral seal portions FS which are
 formed by heat sealing the film F by means of lateral seal rolls not shown
 in drawings in a direction perpendicular to the longitudinal direction of
 the film F.
 Furthermore, as shown in FIG. 8, the pouches P may be formed such that two
 sheets of films F1, F2 are overlapped and pulled out while being guided,
 both side peripheral portions of these films F1, F2 are respectively heat
 sealed by two vertical seal rolls not shown in drawings to form a bag in a
 cylindrical form with vertical sealed portions FH1, FH2 at both sides of
 the films F1, F2 and subsequently, lateral sealed portions FS are formed
 by heat sealing the bag by means of lateral seal rolls not shown in the
 drawing in a direction perpendicular to the longitudinal direction of the
 film F so as to form pouches P which have four sides thereof heat sealed.
 Furthermore, a filling and packaging machine shown in FIG. 9 or the like is
 also proposed. In the drawing, a sheet of film F is pulled out while being
 guided in a half folded condition, the folded back end portions which are
 half folded back and the central portion of the folded back film F are
 respectively heat sealed by two vertical seal rolls not shown in the
 drawing such that cylindrical bags in two rows are formed by the heat
 sealed vertical seal portions FH1, FH2, and contents W1, W2 of different
 kinds, sauce and mayonnaise or soy sauce and spicy oil, for example, are
 filled in cylindrical bags of respective rows, and subsequently, the film
 F is heat sealed in a direction perpendicular to the longitudinal
 direction of the film F by means of lateral seal rolls not shown in the
 drawing, whereby pouches P are packaged and sealed in two rows by these
 heat sealed lateral sealed portions FS and the above-mentioned vertical
 sealed portions FH1, FH2.
 By the way, at the time of forming the packaging pouches P as shown in the
 above-mentioned FIG. 7-FIG. 9, in case the width or the vertical seal
 position of the pouch P to be packaged is different, in general, as shown
 in FIG. 10, at least one vertical seal roll 9A out of vertical seal rolls
 9, 9A which are fixedly mounted on the rotating shaft 5A of the vertical
 seal mechanism 5 is movably adjusted relative to the rotating shaft 5A
 corresponding to the width and the vertical seal position of the film F
 and hence, the vertical sealed position FH2 is set corresponding to the
 width of the pouch P.
 In this case, the rotating shaft 5A is inserted in the vertical seal roll
 9A such that the vertical seal roll 9A is disposed around the outer
 peripheral portion of the rotating shaft 5A. This vertical seal roll 9A is
 mounted on and fixedly secured to the rotating shaft 5A at a given
 position by fastening with bolts or the like.
 Here, a heater not shown in the drawing is incorporated in the rotary shaft
 5A and the heat of this heater is transmitted to the vertical seal rolls
 9, 9A by way of the rotating shaft 5A and hence, the vertical seal rolls
 9, 9A are heated. The conventional heater, however, is fixedly secured to
 the rotating shaft 5A and hence, a given temperature distribution is
 present corresponding to the mounting position of the heater relative to
 the rotating shaft 5A. In general, in a longitudinal direction of the
 heater, the temperature takes the highest value around the central portion
 of the heater and is lowered gradually in a direction from the central
 portion to the end portions of the heater. In this case, to compare the
 movable vertical seal roll 9A with the fixed vertical seal roll 9, the
 distances between the respective vertical seal rolls 9, 9A and the heater
 are different so that the surface temperatures of the seal portions of the
 vertical seal rolls 9, 9A become different and hence, the vertical sealed
 portion FH1 and the vertical sealed portion FH2 differ in the sealed
 condition.
 Accordingly, although the heater can cope with pouches with a narrow
 distance between the vertical sealed portion FH1 and the vertical sealed
 portion FH2, this temperature difference becomes remarkable with respect
 to pouches with a wide distance between the vertical sealed portion FH1
 and the vertical sealed portion FH2. Therefore, while the proper sealing
 is obtained at one vertical sealed portion, the film is excessively fused
 at the other vertical sealed portion or, in an opposite case, the film is
 insufficiently fused or adhered thus resulting in the sealing failure.
 Furthermore, two pairs of vertical seal rolls 9, 9A differ in their
 respective shapes and volumes and hence, they differ in the heat
 capacities, the manner of transmitting heat and also in the heat radiation
 condition. Although the surface temperatures of the sealed portions of two
 pairs of the vertical seal rolls 9, 9A may be made equal by performing a
 calculation in a thermal engineering manner corresponding to the volumes
 and the shapes and then, by differing the winding densities of the heater
 in a longitudinal direction of the heater, for example, there arises a
 problem that it pushes up the design cost and the manufacturing cost.
 Accordingly, it is an object of the present invention to provide a heat
 seal device of a filling and packaging machine which can assure the stable
 sealed condition of the vertically sealed parts, wherein the surface
 temperatures of the sealed portions which are respectively provided to two
 pairs of vertical seal rolls mounted on the rotating shafts with a given
 distance in an axial direction of the rotating shafts are made
 substantially equal with a simple construction.
 DISCLOSURE OF THE INVENTION
 The present invention discloses a heat seal device of a filling and
 packaging machine, wherein a continuously fed film is vertically sealed by
 a vertical seal mechanism so as to form the film in a cylindrical shape
 and sealed laterally by lateral seal mechanisms so as to form a bottom
 portion which forms packaging bags, contents are filled in the film formed
 in the bottomed cylindrical shape and, while the film is fed, a portion of
 the film which forms a bag opening portion side is sealed laterally by the
 lateral seal mechanisms for continuously packaging as pouches, the
 improvement being characterized in that the vertical seal mechanism
 comprises a pair of rotating shafts incorporating heaters and mounted
 rotatably and two pairs of vertical seal rolls which are mounted in pairs
 on the rotating shafts with a given distance in the axial direction of the
 rotating shafts and have seal portions protruded in a flange shape around
 outer peripheral portions of said vertical seal rolls respectively, the
 heaters incorporated in the rotating shafts are disposed movably along the
 axial direction of the rotating shafts with the position of the heaters
 capable of being adjusted movably relative to the position of two pairs of
 the vertical seal rolls so that the surface temperatures of the seal
 portions of two pairs of the vertical seal rolls are made generally equal
 to each other. Due to such a constitution, the surface temperatures of the
 respective seal portions which are provided to two pair of the vertical
 seal rolls mounted on the rotating shaft with a given distance in an axial
 direction of the rotating shaft can be substantially made equal readily
 and the sealed condition of the vertical sealed portions can be made
 stable.
 Furthermore, according to the above-mentioned heat seal device of the
 filling and packaging machine, the rotating shaft is made of a hollow
 shaft, the heater is inserted into the inside of the hollow shaft, and the
 heater is movably disposed in the inside of the hollow shaft. Due to such
 a constitution, the rotating shafts made of the hollow shafts are heated
 by the heater and then two pairs of the vertical seal rolls which are
 mounted on the outer peripheral portions of the rotating shaft are heated
 by way of the rotating shafts. Here, the heaters incorporated in the
 rotating shafts are movably disposed along the axial direction of the
 rotating shaft and the position of the heater can be moved and adjusted in
 the inside of the hollow shaft relative to the positions of two pairs of
 the vertical seal rolls such that the surface temperatures of the
 respective sealed portions provided to two pairs of vertical seal rolls
 can be substantially made equal and hence, the temperatures of the
 vertical seal rolls which respectively form pairs can be maintained at a
 substantially constant value.
 Furthermore, according to the above-mentioned heat seal device of the
 filling and packaging machine, spacers are provided to end portions of the
 heaters and the heaters are pressed by way of the spacers for making the
 heaters movable. Due to such a constitution, at the time of moving and
 adjusting the position of the heaters relative to the position of two
 pairs of the vertical seal rolls in the inside of rotating shafts made of
 the hollow shafts by way of the spacers, the heaters can be protected by
 the spacers and hence, the heaters are prevented from the rupture thereof.
 Furthermore, according to the above-mentioned heat seal device of the
 filling and packaging machine, at least one pair of the vertical seal
 rolls are mounted such that the vertical seal rolls can be moved relative
 to the rotating shaft in an axial direction of the rotating shaft. Due to
 such a constitution, the vertical seal roll mounting position can be
 readily moved and adjusted along the axial direction of the rotating shaft
 corresponding to the width of the pouches or the vertical sealed
 positions. Furthermore, the heater can be moved and adjusted corresponding
 to the position of the vertical seal rolls which are moved and adjusted in
 the above mentioned manner. Accordingly, the surface temperatures of the
 vertical seal rolls which respectively form pairs can be set to
 substantially equal value and hence, the stable sealed condition can be
 obtained.
 Furthermore, according to the above-mentioned heat seal device of the
 filling and packaging machine, the vertical seal rolls are provided with
 temperature detection means. Due to such a constitution, the temperature
 of the vertical seal rolls can be measured by the temperature detection
 means and hence, the surface temperatures of the vertical seal roll
 portions can be substantially made equal and the degree of sealing at the
 sealed portions formed by respective pairs of the vertical seal rollers
 can be made equal thus stabilizing the sealed condition of the vertical
 sealed portions.

BEST MODE FOR CARRYING OUT THE INVENTION
 The embodiments of the present invention are hereinafter explained in
 conjunction with attached drawings. FIG. 1 to FIG. 4 show one embodiment
 of the present invention, wherein at a side of a machine base 11 of a
 filling and packaging machine, holder frames 12 which replaceably hold
 film rolls R wound in a roll shape are disposed and the films F are pulled
 out from the film rolls R supported by the holder frames 12 while being
 guided by the holder frames 12.
 On the upper portion of the machine base 11, a film guide portion 13 made
 of a film slackening prevention mechanism is mounted such that the film F
 which passes through this film guide portion 13 is led to a film folding
 back portion 14. An adjusting mechanism 15 which is capable of adjusting
 the movement of the film F corresponding to the width of the film F is
 provided to the film folding back portion 14. A bar-like guide rod 16
 which supports and guides the folded back portion of the film F is also
 provided to the film folding back portion 14 in a vertically downwardly
 extending manner.
 A pair of nozzles 18, 18A which are provided to a filling mechanism 17 and
 vertically downwardly extend are arranged in parallel with this guide rod
 16. Through these respective nozzles 18, 18A, contents W1, W2 such as
 sauce, mayonnaise, soy sauce or the like can be filled.
 Below the film folding back portion 14, on the front surface of the machine
 base 1, a vertical seal mechanism 19, first and second lateral seal
 mechanisms 20, 21 and a cutter mechanism 22 are disposed in the order from
 the above. Upon actuation of the cutter mechanism 22, pouches p are cut
 out as packaged single-pack pouches and these pouches P are transferred by
 way of a discharge mechanism 23. Alternatively, the operation of the
 cutter mechanism 22 is stopped and pouches P are formed by laterally
 sealing the film by means of the lateral seal mechanisms 20, 21 and
 pouches P which are connected in a continuous manner are discharged
 through the discharge mechanism 23.
 By the way, in the vertical seal mechanism 19 of the present invention,
 bearing bases 24, 24A are mounted on the front surface of the machine base
 11 and a pair of rotating shafts 25 which are provided to the vertical
 seal mechanism 19 are rotatably supported between and by the bearing bases
 24, 24A. A pair of the rotating shafts 25 are disposed in parallel to each
 other such that they sandwich the above-mentioned guide rod 16 and
 respective nozzles 18, 18A. One rotating shaft 25 and the other rotating
 shaft 25 are respectively provided with helical gears 26 which are meshed
 with each other. A driven bevel gear 27 is integrally mounted on one
 helical gear 26 and the driven bevel gear 27 is meshed with a driving
 bevel gear 29 which is driven by a drive device 28 installed in the inside
 of the machine base 11.
 Furthermore, a pair of first vertical seal rolls 31 are mounted on a pair
 of rotating shafts 25 such that the rotating shafts 25 pass through the
 first vertical seal rolls 31, wherein the first vertical seal rolls 31 are
 provided with seal portions 30 which protrude like a flange on the outer
 peripheral portions thereof for overlapping and heat sealing both folded
 back end peripheries of the folded back film F which are folded back by
 the film folding back portion 14. The respective vertical seal rolls 31
 are fixedly mounted on the rotating shafts 25 by way of fixed nuts 32.
 Furthermore, in case of forming and sealing pouches P shown in FIG. 9, in
 addition to the first vertical seal rolls 31, a heat seal mechanism which
 heat seals the central portion of the folded back film F in a vertical
 direction is provided. In this embodiment, second vertical seal rolls 34
 which are formed with mounting holes 33 allowing respective rotating
 shafts 25 pass therethrough and vertically seal the central portion of the
 folded back film F are movably mounted on with the outer peripheral
 portions of the rotating shafts 15 along the axial direction of the
 rotating shafts 25.
 These second vertical seal rolls 34 are disposed in a spaced apart manner
 with a given distance in the axial direction of the rotating shafts 25
 relative to the first vertical seal rolls 31. The second vertical seal
 rolls 34 are provided with seal portions 35 which protrude like a flange
 on the outer peripheral portions thereof. With such a provision, the
 central portion of the film F which is folded back and fed is pressed and
 heat sealed along with the rotation of a pair of the second vertical seal
 rolls 34.
 At the sides of the second vertical seal rolls 34, annular groove portions
 37 which are formed with tapered surfaces 36 in the inside thereof are
 provided. Due to these annular groove portions 37, annular tapered thin
 film portions 38 are formed at the mounting hole 33 sides. By inserting
 and disposing taper rings 39 which have an approximately same shape as
 that of the annular groove portions 37 in the annular groove portions 37,
 inserting and disposing the tapered rings 39 in the inside of the annular
 groove portions 37 of the second vertical seal rolls 34 and then inserting
 fastening bolts 40 into bolt inserting holes 41 formed in the second
 vertical seal rolls 34 and bolt mounting holes 42 formed in the tapered
 rings 39 and fastening these fastening bolts 40 by rotation, threaded
 portions 42A formed in the bolt mounting holes 42 and threaded portions
 40A of the fastening bolt 40 are engaged with each other. Due to such an
 engagement, the tapered rings 39 are fitted into the annular groove
 portions 37 formed in the second vertical seal roll 34 in the depth
 direction thereof, that is, along the axial direction of the rotating
 shafts 25. Simultaneously with this operation, the tapered thin film
 portions 38 formed on the second vertical seal rolls 34 have the diameter
 thereof narrowed toward the outer peripheral surface of the rotating
 shafts 25 and hence, the tapered thin film portions 38 are fastened and
 secured to the outer peripheral surface of the rotating shafts 25.
 Accordingly, the second vertical seal rolls 34 are fixedly secured to the
 rotating shafts 25 at a given position which is a given distance spaced
 apart from the first vertical seal rolls 31 in the axial direction of the
 rotating shafts 25.
 In this manner, the vertical seal mechanisms 19 are constructed such that
 two pairs of vertical seal rolls 31, 34 having seal portions 30, 35 which
 protrude like a flange on the outer peripheral portions thereof are
 mounted on the rotating shafts 25 while forming pairs respectively in a
 spaced apart manner from each other with a given distance in the axial
 direction of the rotating shafts 25.
 A pair of the rotating shafts 25, 25 are made of hollow shafts and heaters
 H are respectively disposed in the insides of the hollow shafts. The
 rotating shafts 25 are heated by these heaters H and the first vertical
 seal rolls 31 and the second vertical seal rolls 34 are heated by way of
 these heated rotating shafts 25.
 The heaters H incorporated in the rotating shafts 25 are movably disposed
 in the axial direction of the rotating shafts 25. The position of the
 heaters H relative to the position of two pairs of vertical seal rolls 31,
 34 can be moved and adjusted in the insides of the hollow shafts such that
 the surface temperatures of the respective seal portions 30, 35 of two
 pairs of vertical seal rolls 31, 34 made of the first vertical seal rolls
 31 and the second vertical seal rolls 34 become substantially equal.
 To explain more concretely, the rotating shafts 25 are provided with hollow
 portions 43 which extend through from one sides to the other sides of the
 rotary shafts 25. Bar-like heaters H having an outer diameter slightly
 smaller than an inner diameter of the hollow portions 43 are inserted in
 the hollow portions 43 and spacers 44 are simultaneously inserted in the
 hollow portions 43 such that spacers 44 are provided to both end portions
 of the heaters H. Then, the heaters H are pressed by pusher bars not shown
 in the drawing by way of the spacers 44 such that the heaters H are deeply
 inserted into the insides of the rotating shafts 25. Simultaneously,
 pusher bars are inserted into the rotating shafts 25 from one-side opening
 portions or other-side opening portions of the rotating shafts 25 and
 spacers 44 are pushed by these pusher bars so as to set the heaters H at
 proper positions.
 Due to such a positional setting, in the condition that electricity is
 supplied to the heaters H, the surface temperatures of the seal portions
 30, 35 of the first and second vertical seal rolls 31, 34 are made
 substantially equal. Accordingly, the degree of sealing of the sealed
 portions FH1, FH2 which are formed by the first and second vertical seal
 rolls 31, 34 can be made equal and hence, the sealed condition of the
 vertical sealed portions FH1, FH2 can be stabilized.
 That is, by merely balancing the temperatures of the seal portions 30, 35
 of the first and second vertical seal rolls 31, 34, a proper seal can be
 obtained by setting the temperature of the heaters H and hence, the sealed
 condition can be made stable.
 Furthermore, with the provision of the spacers 44, at the time of pressing
 the heaters H by pushing the heaters H with the push bars, the heaters H
 are not directly pushed by the push bars but are pushed by way of the
 spacers 44 and hence, an effect that the rupture of the heaters H can be
 prevented is obtained.
 As has been described above, in the filling and packaging machine of the
 embodiment, the film F is pulled out from the film roll R wound like a
 roll while being guided, this continuously transferred film F is fed to
 the film folding back portion 14 by way of the film guide portion 13, the
 film F is fed to the vertical heat seal mechanism 19 in the condition that
 the film F is folded back in a double fold along the guide rod 16 provided
 to the film folding back portion 14, the film F is vertically sealed in
 the vertical direction by means of the first vertical seal rolls 31 while
 overlapping the both folded back end peripheries of the folded back film
 F, the central portion of the folded back film F is vertically sealed in
 the vertical direction by means of the second vertical seal rolls 34, the
 film F is formed in cylindrical bags in two row by the respective vertical
 seal portions FH1, FH2 which are vertically sealed by the first and second
 vertical seal rolls 31, 34 as shown in FIG. 9, then the film F is
 laterally sealed in the lateral direction by a pair of opposing lateral
 seal rolls 20A of the first lateral seal mechanism 20 thus forming bottoms
 of the packaging bags by the lateral sealed portions FS, contents W1, W2
 such as liquids are filled in the inside of the film F which are formed
 into bottomed cylinders in two rows by way of two nozzles 18, 18A provided
 to the filling mechanism 17, furthermore, the portions which form the bag
 opening sides of the film F are laterally sealed by the lateral seal rolls
 20A of the first lateral seal mechanism 20 while feeding the film F so as
 to hermetically seal the contents W1, W2, these hermetically sealed
 lateral seal portions FS are sealed in duplicate by means of the lateral
 seal rolls 21A of the second lateral seal mechanism 21 and three sides of
 the film F are sealed so as to form the pouches p, then the intermediate
 portions of the lateral seal portions FS provided for forming the pouches
 P are cut into pouches P of single-pack package by means of the cutter
 mechanism 22, and these cut pouches P are transferred by way of the
 transfer mechanism 23 or alternatively the continuous pouches P are
 transferred in a continuously connected form by way of the transfer
 mechanism 23 provided that the operation of the cutter mechanism 22 is
 stopped.
 In the above-mentioned embodiment, at the time of forming the pouches P
 while filling the contents W1, W2 therein, in case the width of the pouch
 P for packaging or the vertical sealing position is different, since the
 position of the both folded end peripheries of the film F which is folded
 back and guided by the film folding back portion 14 is used as the
 reference usually, the mounting position of the first vertical seal rolls
 31 which vertically seal the film F while overlapping both folded back end
 peripheries of the film F is fixed and the first vertical seal rolls 31
 are fixedly secured to the rotating shafts 25, and corresponding to an
 amount of difference of width of the pouches P or the vertical seal
 position, the mounting position of the second vertical seal rolls 34 is
 movably adjusted along the axial direction of the rotating shafts 25.
 In this case, corresponding to the width of the film F, the guide rod 16
 which supports the folded back portion of the film F is movably adjusted
 by way of the adjusting mechanism 15. Furthermore, in case of adjusting
 the position of the second vertical seal rolls 34 which vertically heat
 seal the folded back portion of the folded back film F and the central
 portion of the both folded back end peripheries of the film F, respective
 fastening bolts 40 are slackened so as to release the threading force
 exerted between the threaded portions 40A of the respective fastening
 bolts 40 and the threading portions 42A formed in the bolt mounting hole
 42 of the tapered ring 39 and hence, the tapered rings 39 are operated in
 a direction opposite to the depth direction of the annular groove portion
 37 formed on the second vertical seal roll 34, that is, the slackening
 direction so that the fitted condition that the tapered rings 39 are
 fitted into the annular groove portions 37 mounted on the second vertical
 seal rolls 34 is released. Accordingly, the fastening force applied the
 taped thin film portions 38 provided to the second vertical seal rolls 34
 pressurized by the tapered rings 39 is eliminated and hence, the tapered
 thin film portions 38 which had the diameter thereof narrowed toward the
 outer peripheral surfaces of the rotating shafts 25 and were fixedly
 secured to the outer peripheral surfaces of the rotating shafts 25 by
 fastening are allowed to be movable in the axial direction of the rotating
 shaft 25. Accordingly, corresponding to the vertical seal positions of the
 central portions of the folded back film F, the second vertical seal rolls
 34 are movably adjusted. After this adjustment, the fastening bolts 40 are
 fastened by rotation so as to make the tapered rings 39 inserted into the
 annular groove portions 37 of the second vertical seal rolls 34 and hence,
 the tapered thin film portion 38 formed in the second vertical seal roll
 34 is narrowed toward the outer peripheral surfaces of the rotating shafts
 25 by way of the tapered rings 39 and are fastened and fixedly secured to
 outer peripheral surfaces of the rotating shafts 25.
 In case the mounting position of the second vertical seal rolls 34 is
 movably adjusted along the axial direction of the rotating shafts 25
 corresponding to the width of the pouches P and the vertical seal position
 in the above-mentioned manner, the pusher bars are inserted in the hollow
 portions 43 of the rotating shafts 25 and push the heaters H from one side
 or the other side so as to movably adjust the heaters H and hence, the
 heaters H can be positioned and set corresponding to the moved second
 vertical seal rolls 34 such that the surface temperatures of the seal
 portions 30, 35 of the first and second vertical seal rolls 31, 34 are
 made substantially equal.
 The surface temperature of the seal portions 30, 35 of the vertical seal
 rolls 31, 34 can be measured, for example, by mounting temperature
 detecting means such as thermocouples not shown in drawings on the
 respective vertical seal rolls 31, 34.
 In the above-mentioned embodiment, the example where a sheet of film F is
 pulled and guided in the half folded condition, and the both folded back
 end portions which are folded back in the half folded condition and the
 central portion of the folded back portion are heat sealed in the vertical
 direction in a cylindrical shape in two rows to form pouches P by means of
 two vertical seal rolls 31, 34 has been described. However, for example,
 with respect to an embodiment where four sides of the film F are sealed so
 as to form pouches P as shown in FIG. 7 and an embodiment where two sheets
 of films F1, F2 are pulled and guided while being overlapped and both side
 end peripheries of the respective films F1, F2 are vertically heat sealed
 by means of two vertical seal rolls 31, 34 and simultaneously four sides
 of the films F1, F2 are sealed so as to form pouches P as shown in FIG. 8,
 the same operations and effects as those of the previously mentioned
 embodiment can be obtained by adopting the position adjusting mechanism
 which is capable of adjusting the position of the heaters H corresponding
 to the position adjusting mechanism of the vertical seal rolls 31, 34.
 Furthermore, the present invention is not limited to the above-mentioned
 embodiment and various modified embodiments can be made within the scope
 of the gist of the present invention. For example, the pusher rods which
 are not shown in drawings are fixedly mounted on the rotating shafts and
 threaded portions are formed in end portions of the pusher rods and the
 position of the heater can be finely adjusted from outside by rotating the
 threaded portions.
 Furthermore, although the first and second vertical seal rolls are
 respectively individually mounted in the previously mentioned embodiment,
 the first and second vertical seal rolls may be integrally formed to
 constitute a vertical seal roll.
 As has been explained in detail, according to the present invention, the
 heat seal device of the filling and packaging machine where with a simple
 constitution, the surface temperatures of the seal portions of the
 vertical seal rolls disposed in a spaced apart manner with a given
 distance in the axial direction of the rotating shaft are made
 substantially equal and hence, the degree of sealing of respective
 vertical seal portions formed by the seal portions of the respective
 vertical seal rolls can be made equal thus stabilizing the sealed
 condition of the vertical seal portions can be provided.
 Furthermore, in case the mounting positions of the vertical seal rolls are
 movably adjusted along the axial direction of the rotating shaft
 corresponding to the width of the pouches P and the vertical seal
 positions, the heater is movably adjusted such that corresponding to the
 moved vertical seal rolls, the heater is positioned and set so as to make
 the surface temperature of the seal portions provided to the first and
 second vertical seal rolls substantially equal. Accordingly, the further
 effect can be obtained.
 Industrial Applicability
 As has been described heretofore, the present invention discloses the heat
 seal device of the filling and packaging machine where the film wound like
 a roll is formed into bags and contents such as liquid, powdery material,
 or pasty material are filled into packaging bags. The present invention is
 useful to the mechanism for movably adjusting the position of a pair of
 the vertical seal rolls provided to the vertical seal mechanism at the
 time of forming the film into a cylindrical shape by the vertical seal
 mechanism of the heat seal device corresponding to the size and the width
 of the packaging bag for packaging. Particularly, the present invention is
 adapted for use in eliminating irregularities of the heating temperature
 of the vertical seal rolls by the heaters in case the distances of a
 plurality of pair of vertical seal rolls have to be changed.