A PACKAGING CONTAINER OPENING FORMATION DEVICE FOR A PACKAGING MACHINE

Abstract: A packaging container opening device for a packing machine is provided with an adjustable manufacturing equipment placed along the conveyance of a packaging web to produce as well pull-tab type and non-pull-tab type packaging containers with one single packing ma­ chine.

Description: Background of the Invention The present invention relates to a packaging container opening formation device for a packing machine used in manufacturing packaging containers filled with liquid food such as milk, in which two opening types, i.e., a pull-tab opening type and a non-pull-tab type such as a straw type or a cutting type that requires scissors to open, can be quickly and easily switched. Paper containers commonly called "pack" containers as shown in Figures 12 and 16 are used as containers for the vending of juice, milk, etc. The packaging web (1) consisting mostly of paper that is used for such packaging container (P) is usually made of support paper (1₁) with a metal foil layer (1₂) such as aluminum foil on one surface, and the surface of said metal foil layer (1₂) and the other surface of the paper (1₁) are laminated with a thin polyethylene layer (1₃) as shown in Figure 15. At least three forms of packaging container (P) are known to meet market needs: a container with a straw hole (6) (see Fig. 15) provided on the top plane, in which said straw hole is previously closed by laminating with a polyethylene layer (1₃) and a metal layer (1₂) so that the liquid food inside is easily consumed with a straw by piercing said closed straw hole with a straw (see Fig. 16); a container in which a triangle flap on the upper corner of the container is cut with scissors to make a liquid-pouring hole; or a container in which a liquid-pouring hole (5) made of a punch hole is previously formed on the top plane of the container so that said liquid food can be easily poured, and the inside of said liquid-pouring hole (5) is sealed with a strip tape (2) to make the container liquid tight, and a pull-tab (7a) is heat-sealed on the outside so that the liquid-pouring hole (5) can be easily opened by pulling said pull-tab (7a) off to tear the punch hole area of the strip tape (2) (see Fig. 12). Among the above-mentioned opening devices for the container, in order to provide the straw hole (6) on the container, the conventional method is to provide folding lines on long, rolled paper of a prescribed width, and after piercing a small diameter punch hole to be used as a straw hole at a constant interval of ( l ), a polyethelene layer (1₃) is laminated on one side of the paper (11) and an aluminum layer (1₂) and a polyethylene layer (1₃) on top of it are laminated on the other side by a laminating machine to close said punch hole. (see Fig. 13 and Fig. 15), and then said web (1) is supplied to the packing machine. One side edge of said web continuously carried to the filling section is then heated, and a strip tape (3) that covers the end face of the web when forming the web into a pipe by pasting both edges of the longitudinal direction of the web is pasted (see Fig. 14), to form the web into a pipe while running continuously. After filling, the web is cut and formed to make a packaging container with a straw hole opening. The above mentioned process applies to the type of container in which the liquid-pouring opening is opened by cutting with scissors, except that this type does not come with a straw hole. On the other hand, in order to provide a pull-tab type opening device on the container, long, rolled paper is provided with the required folding lines and, without piercing it, it is formed into a packaging web (1) by laminating it as described above (see Fig. 8: folding lines of web (1) omitted for simplicity), and in this condition it is configured so that said opening device is formed at a prescribed position of the packaging web (1) that is intermittently conveyed. The web with an opening device is folded in the continuously running condition and both edges in the longitudinal direction are pasted, after which it is filled with liquid food, cut off and formed to make a container. Formation of this opening device onto the web (1) is conducted in such a manner that an intermittently conveyed web (1) is provided with pierced punch holes (5) for liquid-pouring with constant intervals of ( l ) (see Fig. 9), and after a wide strip tape (2) that covers a punch hole (5) is overlapped and heated and deposited on a prescribed position on one edge of said pierced web (see Fig. 10), a pull-tab (7a) of a prescribed length is joined by heat on the back of the web to close said punch hole (5) (see Fig. 11). For heating and depositing of the strip tape (2) to the web (1), a heat coil for high-frequency induction heating is currently used, and for heat joining of the pull-tab (7a), between the heating body (12₁) equipped with a cutting means and that moves vertically synchronously with an intermittently moving web (1) and the receptacle positioned above the path of the web (1), a pull-tab (7a) of a prescribed length is cut out from the pull-tab tape and joined by heat on the bottom plane of said web (1). (Problems to Be Solved by the Invention) In the manufacture of containers of conventional types such as the straw hole opening type or the type in which the liquid-pouring opening is cut and opened, the packaging web (1) is continuously conveyed, at the time of pasting the strip tape (3), with web foldings adjusted with conveyance, whereas in the case of manufacturing containers of the pull-tab opening type, in order to mount a pull-tab onto a web, although webs are continuously conveyed with their folding lines adjusted with conveyance in the filling section, they are conveyed intermittently in the pull-tab mounting section, and therefore it was difficult for one machine to handle the manufacture of containers of two different opening types: the above mentioned pull-tab opening type and a non-pull-tab opening type. For manufacturing containers of a non-pull-tab opening type such as a straw hole opening type, there is no need to pierce a hole for the pull-tab liquid-pouring opening or to cover said liquid-pouring hole, and therefore a prescribed, narrow strip tape is used. For manufacturing containers of the pull-tab opening type, however, in addition to its original purpose of pasting both edges of the web, the strip tape is used to seal the liquid-pouring hole, and therefore a wide strip tape is used. Moreover, the pull-tab had to be pasted from the opposite direction of the side where the strip tape is pasted, and for this purpose, another device was necessary in the web conveyance path to the filling section of the packing machine. In other words, a machine with an opening formation device to form a pull-tab opening and a machine with a simple strip tape pasting device were necessary in order to make the above two types of packaging containers. It is possible to modify a machine with a simple strip tape pasting device to a machine with a pull-tab opening formation device with optional equipment, but the modification is not easily done. Summary of the Invention The present invention was conceived with the above situation in mind, with the purpose of providing a packaging container opening formation device for a packing machine in which a single device without any optional equipment can switch from the manufacture of packaging containers of the pull-tab opening type to the manufacture of packaging containers of non-pull-tab opening types such as the straw hole opening type. In order to solve the above mentioned problems, the present invention comprises along the path of an intermittently conveyed packaging web at a constant interval of ( l ), at least: a punch hole piercing means for a liquid-pouring opening with a punch to pierce a punch hole for the liquid-pouring opening on said packaging web arranged so that it can escape from the piercing position to the non-piercing condition when the machine is activated; a strip tape pasting means with a flat heating member and pressure plate that is freely pressable to said member provided facing each other across said conveyance path of the web in such a manner that they can be switched respectively with another heating member or a pressure plate depending on the width of the strip tape so that a prescribed, wide strip tape is used to close and paste a punch hole pierced on the packaging web, whilst a prescribed, narrow strip tape is pasted onto a packaging web that does not need a punch hole for the liquid-pouring opening such as the packaging web whose straw hole is covered and closed with a plastic film after piercing; a pull-tab pasting means provided in the downstream of said strip tape pasting means on the conveyance path in such a manner that its cutting and heating member is provided on the opposite side of said strip tape across the conveyance path so as to cut a pull-tab from a pull-tab tape and heat-deposit it, is provided to be in a non-active condition when the machine is activated; a strip tape supply means that can guide and supply prescribed, wide and narrow strip tapes selectively to a prescribed position of said strip tape pasting means; and a pull-tab supply means that can supply the pull-tab tape to said pull tab pasting means, to enable manufacture of packaging containers with a pull-tab opening device and packaging containers with a non-pull-tab opening device such as a straw hole opening. Said punch hole piercing means for a liquid-pouring opening is preferably equipped with a lever that has a liquid-pouring opening formation punch hole fastened at one end, and that oscillates around a pivot, for which the lever has a cam roller that interlocks with the cam of the main spindle of the device mounted in such a manner that the axis position of the cam roller with regard to the pivot of said lever can be adjusted. The strip tape supply means is equipped with a reel support that allows switching between a reel for the wide strip tape and a reel for the narrow strip tape, and is also equipped with several guide rollers to allow guiding of both wide and narrow tapes to the tape conveyance path that leads to the strip tape pasting means. The guide roller used at a required section of the strip tape conveyance path is preferably a roller that has a circumferential groove in the center corresponding to the width of the prescribed, narrow strip tape, and on its periphery another circumferential groove of a larger diameter corresponding to the width of the prescribed, wide strip tape. It is effective that the strip tape supply means be provided in such a manner that at a prescribed position proximate to the reel support of the strip tape conveyance path, plural guide rollers with fixed axis positions are provided; an oscillating lever that incorporates the same number of guide rollers mounted via axes in series corresponding to said guide rollers to be able to oscillate with regard to the prescribed point are provided; and when the tape suspended between these rollers moves, the movement of said lever is detected by a proximity switch to control the brake of said strip tape reel. The pull-tab pasting means is preferably provided in such a manner that its lever has, on its one end, a cam roller that interlocks with the cam of the main spindle of this opening formation device and, on its other end, a cutting and heating member for the pull-tab tape mounted via a rotating plate that is mounted via an axis to said lever so that it can be rotated by the power of an air cylinder mounted at said lever, and when the lever is activated by the rotation of the cam, such cutting and heating member can escape from the pull-tab cutting and pasting position by controlling the air cylinder. It is also effective that a finger-shaped member to anchor the tip of the pull-tab tape that is supplied and stopped be provided adjacent to the conveyance path of the pull-tab tape of the pull-tab tape supply means for the occasion when the pull-tab tape is not used to switch the content of the work. When conveying processed webs to the filling section of the packing machine using the device configured as mentioned above, the punch hole piercing means for liquid-pouring and the pull-tab pasting means facing the web conveyance path can be activated or inactivated depending on which type of containers are manufactured: in the manufacture of packaging containers with a pull-tab opening device, said punch hole piercing means and pull-tab pasting means are activated, whilst the heating member of the strip tape pasting means and the pressure plate are provided with a type for the prescribed, wide strip tape pasting, and said wide strip tape is mounted on the strip tape supply means so as to be guided to the strip tape pasting means to manufacture packaging containers with a pull-tab opening device; in the manufacture of packaging containers with a non-pull-tab opening device such as packaging containers with a straw hole opening, the above mentioned punch hole piercing means and pull-tab pasting means are inactivated, whilst the heating member of the strip tape pasting means and the pressure plate are provided with a type for the prescribed, narrow strip tape pasting, and said narrow strip tape is mounted on the strip tape supply means so as to be guided to the strip tape pasting means to manufacture packaging containers with a non-pull-tab opening device such as packaging containers with a straw opening device. In this case, if the axis position of the position-adjustable cam roller mounted on the lever fixed with a punch of the liquid-pouring punch hole piercing means is set apart from the cam position of the main spindle of the device, the punch is set in the non-piercing condition. By switching between the wide strip tape reel corresponding to the manufacture of packaging containers with a pull-tab opening device and the narrow strip tape reel corresponding to the manufacture of packaging containers with a non-pull-tab opening such as a straw hole opening device, and guiding the required strip tape to the strip tape reel support from plural guide rollers that guide either wide or narrow tape in the strip tape conveyance path using an adequate roller, said tape can be conveyed to the prescribed position of the strip tape pasting means smoothly without deviation. By supplying a strip tape to plural guide rollers provided proximate to the reel support side with a fixed axis position, and to the same number of guide rollers provided on an oscillating lever so as to face said rollers so that the tape will run from a guide roller on one side to another guide roller on the other side, the strip tape pasted on the web and intermittently conveyed has its intermittent movement absorbed gradually between the above mentioned guide rollers whose relative positions constantly change; and when the above lever oscillation becomes large, the proximity switch functions to increase the braking power of the above mentioned reel, thereby unifying the feeding of the strip tape from the reel and the tension then applied to the tape. The cutting and heating member for the pull-tab tape on the rotating disk, which is mounted via an axis to the oscillating lever of the pull-tab pasting means, moves apart from the activation position by rotating the rotation disk by electrically controlling the air cylinder on the lever to enter the inactivated condition. When a packaging container with a pull-tab opening device is not being manufactured, the finger-shaped member provided adjacent to the conveyance path of the pull-tab tape can be used to prevent uncontrolled movement of the free end of the pull-tab tape by anchoring the pull-tab tape end to said finger-shaped member. Embodiments of this invention will now be described with reference to the accompanying drawings. Brief Description of the Drawings Fig. 1 is a front view schematically showing the main part of the device in accordance with the present invention; Fig. 2 is a side view of the liquid-pouring punch hole piercing means; Fig. 3 is a side view with a part of the strip tape pasting means omitted; Fig. 4 is a side view of the pull-tab pasting means; Fig. 5 is a front view showing the important part of the strip tape supply means viewed from a plane perpendicular to Fig. 1; Fig. 6(a) is a side view of a guide roller for a wide strip tape; Fig. 6(b) is a side view of a guide roller for a narrow strip tape; Fig. 6(c) is a side view of a guide roller for both wide and narrow strip tapes; Fig. 7 is an enlarged view of Fig. 5 along line A - A; Fig. 8 is a partial plan view of a packaging web with no holes; Fig. 9 is a partial plan view of a packaging web with punch holes pierced; Fig. 10 is a plan view showing the punch hole of a packaging web closed and pasted with a wide strip tape; Fig. 11 is a plan view showing a packaging web of Fig. 9 with a pull-tab pasted; Fig. 12 is a diagonal view of a packaging container equipped with a pull-tab opening device; Fig. 13 is a partial plan view of a packaging container equipped with a straw hole opening; Fig: 14 is a plan view showing a packaging web of Fig. 13 pasted with a strip tape; Fig. 15 is an enlarged view of Fig. 13 along line B - B; and Fig. 16 is a diagonal view of a packaging container with a straw hole opening. Fig.1 is a schematic front view showing the main part of the device of this invention. This device is provided in the conveyance path of a packaging container (1) to the filling section of a packing machine, wherein a web (1) running upward from an unillustrated packaging web reel provided in the lower lefthand side in the drawing changes its conveyance direction to the horizontal direction via a bending roller (33), and after passing through each processing section of this device, i.e., liquid-pouring punch hole piercing means (10), strip tape pasting means (11), pull-tab pasting means (12), and a pair of downstream bending rollers (35), (35), the packaging web (1) is provided with folding lines by a folding wheel (32) that is in the upper section, and with the folds adjusted, the web is intermittently conveyed between a drive roller (31) intermittently rotated by an unillustrated drive motor and an opposing counter roller (31′). Thereafter, said web (1) is conveyed to the filling section whilst its conveyance is controlled by a vertically moving dancing roller in an unillustrated control magazine. At the direction-switching section that changes the conveyance direction to the horizontal direction as mentioned above, a brake wheel (34) brakes the packaging web (1) that is intermittently conveyed towards the right, and by so doing, adequate tension is applied to said web (1) conveyed with its folds adjusted by the folding wheel (32) so that a stable position is maintained at each processing section (10), (11), (12) at the time of processing. The web (1) passes the processing position of the liquid-pouring punch hole piercing means (10), which is used for piercing a liquid-pouring hole (5) on the web (1) depending on the content of the work, after first changing its direction to the horizontal direction. Said piercing means (10) is provided with a fixed die (10₂) beneath the path of the web (1), and above it a vertically moving punch (10₁) is fixed at the end of an oscillating lever (15) that can oscillate around a fixed axis (15₁). A groove hole (15₂) is provided at a prescribed position in the upper section of the lever (15), and on the back of said groove hole (15₂) the lower part of a substrate (16₁) is located on which a cam roller (16) interlocking with a cam (9) of the main spindle (8) of the device is mounted via an axis, and a screw at the base of handle (15₃) is inserted into said groove hole (15₂) and linked to a substrate (16₁), so that the roller substrate (16₁) can be fixed to the lever (15) by the operation of the handle (15₃) at any position of the groove hole (15₂). A spring (15₄) with its one end anchored at the lever (15) energizes the lever (15) to rotate clockwise, and the cam roller (16) is constantly pressed to the cam (8) to oscillate the lever (15) when the main spindle (8) rotates. Therefore, depending on the type of work, in the manufacture of packaging containers with a pull-tab opening device, the cam roller (16) can be fixed on the lever (15) such that its position is set to perform the prescribed piercing action by handle operation, whilst in the manufacture of packaging containers with a non-pull-tab opening such as a straw hole opening, the cam roller (16) can be set on the lever (15) such that its position is further apart from the cam (9) than in the case of piercing, so that the punch (10₁) moves vertically at a non-piercing position when the device is operating to generate a non-piercing condition of the punch (10₁). (The full-line arrow and the double-dotted arrow show the relationship between the piercing condition and the non-piercing condition.) (See Fig. 2.) Punching chips made after piercing the web (1) are collected to an unillustrated collection bag from a discharge pipe (10₃) extending downward from the fixed die (10₂). The strip tape pasting means (11) at a prescribed position in the downstream of the above-mentioned punch hole piercing means (10) has, in the area below the conveyance path, a flat high-frequency induction heating coil, which is a heating member, mounted in an exchangeable manner on top of a backplate (11₂) in the upper section of the mount (11₄), and in the area above the path, a pressing rail (11₃) mounted in an exchangeable manner in the lower part of a vertically moving counter jaw (11₅) via a detachable side member (11₅′); wherein said high frequency induction heating coil (11₁) and pressing rail (11₃) are selectively used by changing the width of a heat coil part, etc., depending on the type of work, i.e., whether manufacturing packaging containers with a pull-tab opening device or manufacturing packaging containers with a non-pull-tab opening such as a straw hole opening. The above mentioned counter jaw (11₅) is provided in the lower part of a tip member (11₇) mounted via an axis, whilst being interlocked with an unillustrated air cylinder provided at the tip of a lever (11₆), to the tip of said lever (11₆) that is provided with a cam roller (16) driven by a cam (9) (see Fig. 1) mounted at the main spindle (8) at its upper section, to perform the prescribed vertical movement of the main spindle (8) at thc time of rotation (see Fig. 3). When said counter jaw moves vertically, the wide or narrow strip tape ((2) or (3)) guided by the guide rollers will be deposited by high-frequency induction heating onto a prescribed position of the web (1) having a metallic foil layer such that the side edge of said tape protrudes for a prescribed amount from the side edge of the web (1). The wide strip tape (2) for the container with a pull-tab opening device and the narrow strip tape (3) for the container with a non-pull-tab opening such as a straw hole opening are drawn out from a reel (36) supported by a reel support (19) to be described later, and conveyed upward from the lower part as in the case of said packaging web (1) via an oscillating lever (21) part (see Fig.5) that controls the conveyance, and are conveyed to the side of strip tape pasting means (11) after changing its direction at the direction changing roller (37). They are then conveyed in the horizontal direction via guide rollers (20a), (20b) at the upper right-hand side of the punch hole piercing means (10), their deviation being regulated between a vertically arranged pair of braking members, which is an upper part of the braking means (29) that is vertically movable, and their direction being changed downward by a guide roller (20a) on the right-hand side, and past guide rollers (20b), (20a), after which they are overlayed on top of web (1) by the pressing roller (30) located adjacent to the top surface of the conveyance path of the web (1), to be conveyed between the flat high-frequency induction heating coil (11₁), which is a heating member of the strip tape pasting means (11), and the pressing rail (11₃) that moves vertically above it, thereby heat-depositing the top surface of the intermittently conveyed web (1) and the strip tape in the overlayed condition (see Fig.1). Of the guide rollers (20a), (20b) disposed in the front and back of the braking means (29) before said strip tape pasting means, one is a guide roller (20a) for forming a pull-tab opening device and equipped with a wide circumferential groove (20a′) to guide a wide strip tape (2) for closing the liquid-pouring punch hole (5) (see Fig.6(a)), and the other is a guide roller (20b) for forming a packaging web with a non-pull-tab opening such as a straw hole opening and equipped with a narrow circumferential groove (20b′) (see Fig.6(b)). When using a wide strip tape (2), it bypasses the guide roller (20b) with a narrow circumferential groove and runs only on the guide roller (20a) with a wide circumferential groove to reach the pressing roller (30) for overlapping the tape, but when using a narrow strip tape (3), it runs on the guide roller (20b) with a narrow circumferential groove between the guide roller (20a) with a wide circumferential groove, wherein its right and left positions with regard to the direction of the tape progression are aligned to overlap more precisely onto the prescribed position of the web (1) by the pressing roller (30). In the downstream of the above-mentioned strip tape pasting means (11), a pull-tab pasting means (12) is provided after a prescribed interval. Said pull-tab pasting means (12) is used for the purpose of cutting and heat-depositing a pull-tab (7a) from a pull-tab tape onto the bottom surface of the packaging web (1) on which the wide strip tape (2) is heat-deposited onto a punch hole (5) by high-frequency induction. Below the conveyance path of the web (1), a heating body (12₁) equipped with a cutting blade (12₁′) for the pull-tab tape (7) is mounted on the upper part of the rotating disk (27) mounted via an axis to be able to rotate around an axis (25₂) at the upper part of the other end of the lever (25) equipped with a cam roller (16) interlocking with cam (9) of the main spindle (8) of the device and oscillating around an intermediate fixed axis (25₁). On said rotating disk (27), the tip of a piston shaft (26₁) of the air cylinder (26) supported via an axis at the lower end of the lever (25) is mounted via an axis, and by the movement of the electrically controlled cylinder (26), said heating body (12₁) can be switched between the activation position and the non-activation position when the lever (25) oscillates at the time of mechanical operation. (Note that the full-line arrow and the double-dotted line arrow show the relationship between the activation position and the non-activation position.) The pull-tab pasting means (12) is provided with a supply means (14) of the pull-tab tape (7) in the downstream below the path of the web (1) conveyed from said pasting means. The pull-tab tape supply means (14) draws out said tape (7) from a roll (7 R ) on which the pull-tab tape (7) is rolled, and supplies it to the pull-tab pasting means (12) from the downstream side via a supply roller (14₁) section. Adjacent to the supply path of said pull-tab tape (7), a finger-shaped member (Finger) (24) is provided at an adequate position to anchor one end of said pull-tab. By anchoring an end of the pull-tab tape (7) drawn out from the pull-tab tape supply roller (14₁) to this finger (7) when switching from the manufacture of the packaging container with a pull-tab opening device to the manufacture of the packaging container with a straw hole opening, uncontrolled movement of the end of said tape is prevented for the smooth operation of the next step. When a tape is drawn out from the reel of either the wide strip tape (2) or the narrow strip tape (3) supported at the aforementioned reel support (19), depending on the content of the work, and the tape is conveyed via the oscillating lever (21), said tape further runs through a splicer (28) positioned below the pair of reel supports and further through a guide roller (20c) and a guide finger (29) positioned close to said guide roller, toward the oscillating lever (21) provided to be able to oscillate downward (clockwise) around a prescribed point with its own weight or spring power. It is then meanderingly suspended between the three guide rollers (20a) mounted via an axis on said lever (21) and the other three guide rollers (20c) provided on the right of reel (36) on the supporting axis (19) so as to face said guide rollers (20a), in such a manner that the tape runs from one guide roller on one side, e.g., the guide roller (20a) at the left edge on the lever (21), to another guide roller on the other side, e.g., the guide roller (20c) at the upper end. After running from the upper right end guide roller (20c) to the guide roller (20d) whose axis direction crosses orthogonally to the aforementioned guide roller, it runs upward just like the packaging web (1) which is intermittently conveyed from the lower part to the upper part. The above mentioned guide finger (29) is equipped with a narrow circumferential groove to allow the guiding of both wide and narrow tapes. When a wide or narrow strip tape (strip tape (2) in the embodiments shown in Figs.5 and 7) is intermittently conveyed upward, the oscillating lever (21) rotates upward (counter-clockwise) pulled by the tape as the tape moves, and the tape suspended meanderingly between the plural guide rollers (20a) and (20c) is drawn out. When the tape intermittently stops, said lever (21) rotates downward to draw the tape from the reel (36), and when the tape is conveyed upward, the rollers (20a) on the above-mentioned lever (21) repeat approaching and parting between them and the fixed rollers (20c) in the upper part, during which time the intermittent movement is absorbed so that the tension from the reel (36) to the tape is made uniform and so that the tape can be drawn out continuously. When the vertical movement of the lever (21) becomes large, a proximity switch (22) located on the oscillating lever (21) side in the lower part of the guide roller (20c) in the upper left hand side detects the approach of the oscillating lever (21) to the roller (20c) side in the upper part, and the brake provided on the back of the reel (36) is activated to increase the friction of the brake drum (36₁) on the back of the reel (36) to the periphery, so as to control the drawing of the tape from the reel (36) to realize uniform drawing of the tape. The working condition of the device shown in the above embodiment describes the manufacture of packaging containers with a pull-tab opening device, in which a wide strip tape (2) is used for the strip tape supply means (13), and with the activation of the strip tape pasting means (11), the punch hole piercing means (10), pull-tab pasting means (12) and the pull-tab supply means (14) are activated as described above. (See Figs. 1, 2, 3, 4 (full-line arrow).) In this case, the wide circumferential groove part (20′) of a guide roller (20c) designed for both a wide and narrow tape is used (see Figs. 5, 7, 6(c)) together with a guide roller (20a), which are both on the conveyance path (see Figs.1, 6(a)). The high-frequency induction heating coil (11₁) and the pressure rail (11₂) of the strip tape pasting means (11) are selected to match the wide tape (2). As for the web (1), a web with no pierced holes and laminated on both sides (metal foil layer included on one side) is used (see Fig.8). In this case, liquid-pouring punch holes (5) are pierced with a prescribed interval ( l ) between each one of them at prescribed positions on the unpierced packaging web (1) intermittently conveyed with an interval of ( l ) (see Fig. 9), and then a wide strip tape (2) that is guided from the strip tape supply means (13) by guide rollers (20c), (20a) for a wide tape closes the above mentioned punch holes (5) and is overlapped at the pressure roller (30) part so as to protrude a prescribed amount for the purpose of sealing the longitudinal side edges. On the flat high-frequency induction heating coil (11₁) of the strip tape pasting means (11), it is then deposited onto the web (1) to seal the punch hole (5) by a pressure rail (11₃) that moves vertically above the web (1) and that synchronously presses the tape (see Fig.10). Next, a pull-tab opening device is formed on the web (1) (see Fig. 11) in such a manner that a heating body (12₁) that is equipped with a cutting blade (12₁) and which moves vertically joins by heat a pull-tab (7a) of a prescribed length cut out from a pull-tab tape (7) that is conveyed by a supply roller (14₁) from the pull-tab supply means (14) between the counter rails (12₂). The web is formed into a pipe in the filling section, next, where it is filled, cut and formed to become a packaging container with a pull-tab opening device (P) (see Fig.12). When switching from the manufacture of packaging containers with a pull-tab opening device to the manufacture of packaging containers with a non-pull-tab opening device such as packaging containers with a straw hole opening, a narrow strip tape (3) is used for the reel support (19) of the strip tape supply means (13), and a narrow circumferential groove part (20″) of a guide roller (20c) designed for both a wide and narrow tapes (see Fig. 6(c)) is used, whilst a guide roller (20b) having a narrow circumferential groove (20b′) is used together with a guide roller (20a) for a wide tape (see Figs.1 and 6(b)). In this case the punch hole piercing means (11) and the pull-tab pasting means (12) are in the non-activated condition as described earlier. The pull-tab tape (7) is then drawn out from the supply roll (14₁) of the pull-tab supply means (14) and anchored at the finger (27). The high-frequency induction heating coil (11₁) and the pressure rail (11₂) of the strip tape pasting means (11) are replaced with those for the narrow tape. The packaging web is provided with pierced straw holes and is laminated (metal foil layer included on one side). (See Fig. 13.) In this case, the web (1) intermittently conveyed with a prescribed pitch ( l ) passes between the fixed die (10₂) of the inactivated punch hole piercing means (10) and the punch (10₁) that moves vertically above it. At the position of the pressing roller (30) before the strip tape pasting means (11), a narrow strip tape (3) guided from the upper part via a guide roller (20b) for a narrow tape is overlaid on the web (1) for sealing the longitudinal side edge of the web (1) in such a manner that the tape protrudes for a prescribed amount from said edge, and as described earlier, it is pressed by the pressure rail (11₃) on the flat high-frequency induction heating coil (11₁) of the strip tape pasting means (11) and deposited onto the web (1) one after another (see Fig.14). Web (1) equipped with a straw hole (6) closed by lamination and adhered with a narrow strip tape as described above, is then formed into a pipe in the filling section, and after filling, cutting and formation, a packaging container with a straw hole opening (P) is manufactured (see Fig.16). When switching from the manufacture of the packaging container with a straw hole opening to the manufacture of the packaging container with a pull-tab opening device, a wide strip tape (2) is used for the strip tape supply means (13), and the high-frequency induction heating coil (11₁) and the pressure rail (11₃) of the strip tape pasting means (11) are replaced with those for the wide tape, and the non-activated punch hole piercing means (11) and pull-tab pasting means (12) are switched to the activated condition, and finally the packaging web (1) is replaced with a non-pierced one for the pull-tab opening type. When manufacturing the same type of packaging containers consecutively, either wide or narrow strip tape for said packaging container is joined using the splicer (28) in the lower part of the reel support (19) of the strip tape supply means. When switching to another type of container, the previously used tape is joined with the newly used tape before the oscillating lever (21) using a splice tape, and the newly used tape is drawn out to the area above the strip tape pasting means (11), from where it is guided by the prescribed guide roller to the pasting means. The above mentioned guide roller (20a) for a wide strip tape, the guide roller (20b) for a narrow strip tape, and the guide roller (20c) for both wide and narrow strip tapes can be located at any adequate position regardless of the above embodiments. In the above mentioned embodiments, a metal foil layer containing web is used for a packaging web, and a high-frequency induction heating coil is used for a heating member, but the present invention is not restricted to these, and packaging webs without a metal foil layer and a heating member of an ordinary electrical heating can both be used. As is obvious from the above description, the device of the present invention has following effects. Since the device in accordance with Claim 1 comprises along the conveyance path of the packaging web intermittently conveyed at a constant interval, at least a punch hole piercing means for liquid-pouring with a punch to pierce a punch hole for liquid-pouring arranged so that it can escape into the non-piercing condition when the machine is activated; a strip tape pasting means provided in such a manner that its heating member and pressure plate are replaceable with proper types depending on the width of a strip tape so that a wide strip tape is used to close pierced punch holes by pasting whilst a prescribed narrow strip tape is pasted on a packaging web that does not need to be provided with pierced punch holes, a pull-tab pasting means provided in such a manner that a cutting and heating member to cut and heat-deposit a pull-tab from the pull-tab tape can be in the inactivated condition when the machine is activated; a strip tape supply means provided in such a manner that a wide strip tape and a narrow strip tape can be selectively guided to a prescribed position of the strip tape pasting means; and a pull-tab tape supply means that supplies a pull-tab tape to the pull-tab pasting means, between the manufacture of packaging containers with a pull-tab opening device and the manufacture of packaging containers with a non-pull-tab opening device such as a straw hole opening, the process content at each processing means of the device and the guiding and supplying of the strip tape can be switched quite easily in a short time with minimum trouble, and therefore, whilst two lines of machine systems were required conventionally, a pull-tab type and a non pull-tab type, a single machine can handle both types according to the present invention, contributing to the reduction of cost for the equipment. Even when comparing it to the type that can perform the above-mentioned switching using optional equipment, considerable trouble and time can be saved to increase the work efficiency. With the device in accordance with Claim 2, the liquid-pouring punch hole piercing means can be easily switched between the piercing condition and the non-piercing condition by changing or adjusting the cam roller mounting position using a handle, etc. With the device in accordance with Claim 3, a guide roller provided to allow guiding of both a wide pull-tab strip tape and a narrow pull-tab strip tape by switching between them is used to guide and supply the required strip tape to a prescribed position of the strip tape pasting means. With the device in accordance with Claim 4, a circumferential groove for a wide tape and a circumferential groove for a narrow tape are provided on one guide roller, and therefore both tapes can be guided on a single guide roller. With the device in accordance with Claim 5, a strip tape is conveyed between plural guide rollers with fixed axis positions and other plural guide rollers mounted via axes on an oscillating lever, and therefore the intermittent movement of the strip tape that is intermittently drawn out from said guide rollers is gradually absorbed, and by detecting the lever movement by a proximity switch and braking the reel, the feed of the tape from the reel and its tension are made uniform, so that the tape can be drawn out smoothly from the reel. With the device in accordance with Claim 6, the relative position of the pull-tab tape to the oscillating lever of the cutting and heating member can be changed via an electrically controlled air cylinder, so that said cutting and heating member can be easily inactivated. With the device in accordance with Claim 7, unused pull-tab tape is anchored to the finger-shaped member to prevent uncontrolled movement of the tip of the pull-tab tape, so that when switching to the non-pull-tab type, the succeeding work can be performed safely.

Claims: A packaging container opening formation device for a packing machine comprising along the conveyance path of a packaging web (1) intermittently conveyed at a constant interval ( l ), at least: a punch hole piercing means (10) with a punch (10₁) arranged to pierce a punch hole (5) for a liquid-pouring opening in said packaging web (1) and to escape from the piercing position to the non-piercing condition when the machine is activated; a strip tape pasting means (11) with a flat heating member (11₁) and freely pressable pressure plate (11₃) facing each other across said conveyance path and arranged to be switched, respectively, with another heating member or a pressure plate depending on the width of a strip tape to allow a prescribed, wide strip tape (2) to close and paste a punch hole (5) pierced in the packaging web, whilst a prescribed, narrow strip tape (3) is pasted on a packaging web that does not need a punch hole (5) for a liquid-pouring opening such as the packaging web whose straw hole (6) is covered and closed with a plastic film after piercing; a pull-tab pasting means (12) provided downstream of said strip tape pasting means along the conveyance path and cooperating with a cutting and heating member (12₁) provided on the opposite side of said strip tape across the conveyance path to cut a pull-tab (7a) from a pull-tab tape (7) and heat-deposit it, said member being in a non-active condition when the machine is activated; a strip tape supply means (13) for guiding and supplying prescribed, wide and narrow strip tapes (2), (3) selectively to a prescribed position of said strip tape pasting means (11); and a pull-tab supply means (14) for supplying the pull-tab tape (7) to said pull-tab pasting means (12). A packaging container opening formation device for a packing machine in accordance with Claim 1 in which the punch hole piercing means (10) for the liquid-pouring opening is equipped with a lever (15) that having a liquid-pouring opening formation punch (10₁) at one end and oscillating around a pivot (15₁) and having a cam roller (16) engaging with cam (9) of the main spindle (8) of the device, said cam roller (16) being fastened in such a manner that the axis position of the cam roller (16) with regard to the pivot (15₁) of said lever (15) can be adjusted. A packaging container opening formation device for a packing machine in accordance with Claims 1 and 2, in which the strip tape supply means (13) is equipped with a reel support (19) that allows switching between a reel for the wide strip tape (2) and a reel for the narrow strip tape (3), and is also equipped with several guide rollers (20a), (20b), (20c),...to allow guiding of both tapes (2), (3) to the tape conveyance path that leads to the strip tape pasting means (11). A packaging container opening formation device for a packing machine in accordance with Claim 3, in which the guide roller (20c) used at a required part of the strip tape conveyance path has a central circumferential groove (20c') corresponding to the width of the prescribed narrow strip tape (3), and on its periphery another circumferential groove (20") of a larger diameter corresponding to the width of the prescribed, wide strip tape (2). A packaging container opening formation device for a packing machine in accordance with Claims 1 to 4, in which the strip tape supply means (13) comprises a plurality of guide rollers (20c) with fixed axis positions located at a prescribed position near the reel support (19) along the strip tape conveyance path, and an oscillating lever (21) carrying the same number of guide rollers (20a) corresponding in series to said fixed guide rollers (20c), and the movement of said lever (21) is detected by a proximity switch (22) to control a brake (23) of said strip tape reel. A packaging container opening formation device for a packing machine in accordance with Claims 1 to 5, in which the pull-tab pasting means (12) is provided in such a manner that its lever (25) has, on its one end, a cam roller (16) that interlocks with cam (9) of the main spindle (8) of the device and, on its other and, a cutting and heating member (12₁) for the pull-tab tape (7) mounted via a rotating plate (27) that is mounted via an axis to said lever (25) so that it can be rotated by the power of an air cylinder (26) mounted at said lever (25), and when said lever (25) is activated, said cutting and heating member (12₁) can escape from the pull-tab cutting and pasting position by controlling the air cylinder (26). A packaging container opening formation device for a packing machine in accordance with Claims 1 to 6, in which a finger-shaped member (24) is provided adjacent to the conveyance path of the pull-tab tape (7) of the pull-tab tape supply means (14) for anchoring the tip of the pull-tab tape (7) when the supply of the pull-tab tape (7) is stopped.

Inventors: ANDERSSON, ROLF, LINDSKOG, CARL GORAN, LOOVV, CHRISTER
Applicants: AB TETRA PAK
Application year: 1989
Main classification: B31B1
IPC codes: B65B7, B65B9, B31B1, B65B59