APPARATUS FOR FITTING A TUBE ON A CONTAINER OR THE LIKE

Abstract: A folded tube 1 is paid out downward through the rotation of the feed rollers 3, 3 , and fitted on the mandrel 7. And then, the tube 1 fitted on the mandrel 7 is cut to a predetermined length by the cutting means disposed between the feed rollers 3,3 and the mandrel 7. After that, the tube 1a cut to the predetermined length is drawn downward along the mandrel 7 by the rotating means 9, 9 and the tube 1a is unfolded. Finally, the sufficient unfolded tube 1a is dropped down from the mandrel 7 and fitted on a cap portion of the bottle.

Description: This invention relates to a tube fitting apparatus applicable mainly for cap sealing and labeling operations with respect to containers such as bottles and the like. Means for fitting a tube on a container or the like have been known in the art. Typical examples are disclosed in: Japanese Patent Publication No. 49-035752, DE-A-3 533 758 and FR-A-2503689. The US-A 4 497 156 patent discloses the combination of such means with a mandrel. Briefly, the prior art means is such that, as Fig. 4 illustrates, a flat folded continuous tube 1 is fitted on and guided along a mandrel 7e and is then drawn downward in its unfolded condition to a position below the mandrel 7e by a pair of downward drawing belts 9e, 9e separately provided, a lower portion of the tube 1 so drawn down being cut by cutting means 13e to a predetermined length. The cut tube 1e is fitted on a packaging container 16 supplied at a position below the mandrel 7e and is subsequently passed through the step of heat shrinking or the like as required before it is used as a cap seal or a label bearing a trade name and other information. The prior art apparatuses are considerably complicated with respect to its component for tube cutting. This naturally results in poor efficiency in the manufacture of the apparatuses. This invention is directed to overcoming aforesaid problem, with the prior art, and to reduce the time requirement for tube cutting operation, achieving improvement in cut surface finish, thereby enabling proper tube fitting operation. The apparatus according to the present invention, comprising feed rollers 3, 3 disposed above a tube unfolding mandrel 7 to enable a flat folded continuous tube 1 to be transferred and supplied to the mandrel 7; rotating means 9, 9 for drawing the tube downward which are movable at least at their respective upper ends toward and away from a mandrel 7 so as to enable the tube 1 transferred and fed from the feed rollers 3, 3 to be fitted on the mandrel 7 and which are rotatable in contact with the mandrel 7 so as to enable the so fitted tube to be drawn downward from the mandrel 7; and cutting means 13 disposed between the feed rollers 3, 3 and the mandrel 7 for cutting the tube 1 as it is fed from the feed rollers 3, 3 toward the mandrel 7; is characterized in that said rotating means 9, 9 for drawing the tube downward comprise upper and lower pulleys 10, 10a disposed at upper and lower positions at opposite sides, right and left, of the mandrel 7, and belt bodies 11 trained over the upper and lower pulleys 10, 10a, the lower pulley 10, 10 being rotatably supported in position by being held in contact with small rollers 8, 8 disposed at lower opposite sides of the mandrel 7 to thereby hold the mandrel 7 in position. According to a preferred embodiment the upper pulleys 10a, 10a are pivotable for movement toward and away from upper opposite sides of the mandrel 7. FIG. 1 illustrates one embodiment of the tube fitting apparatus in accordance with the invention, FIG. 1 (A)being a front view thereof, FIG. 1 (B) being a sectional view in side elevation thereof, FIG. (C) being an enlarged section taken along the line X-X in FIG. 1 (A), FIG. 1 (D) being a front view showing one form of inner guide; FIGS. 2 and 3 are explanatory views showing steps of tube fitting operation; and FIG. 4 is a sectional view showing the prior art arrangement. Embodiments of the invention will now be described with reference to the accompanying drawings. One embodiment of the apparatus according to the invention will be first explained. In FIG. 1, numeral 1 designates a thin flexible continuous tube made of a synthetic resin material which is in flat folded condition. Numeral 2 designates a roll in which the continuous tube 1 is wound. Designated by 3, 3 are a pair of feed rollers rotatable for successively paying out the continuous tube 1 from the roll 2 via a guide roller 17 or the like. The feed rollers 3, 3 may be driven independently or may be driven in conjunction with other drive units of the apparatus. Numeral 4 designates a thin flat plate spring-shaped inner guide for slightly opening the tube 1 fed through the feed rollers 3, 3, the inner guide 4 comprising a body plate 4a and a spring plate 4b attached to one side of the body plate 4a as FIG. 1 (D) shows. The inner guide 4, with its upper portion locked by a pair of backup rollers 5, 5 disposed above the feed rollers 3, 3, is inserted in the continuous tube 1 paid out through the feed rollers 3, 3. Shown by 6 are rollers disposed on an upper portion of the inner guide 4 which are adapted to turn idle on the backup rollers 5, 5 to prevent the inner guide 4 from falling by being caught between the backup rollers 5, 5 while in rotation. Numeral 7 disignates a mandrel disposed below the feed rollers 3, 3 for tube unfolding, which has its sides slanted into a downwardly reverse tapered configuration. At lower opposite sides of the mandrel 7 there are rotatably supported small rollers 8, 8, upper and lower, in pairs. Numerals 9, 9 designate a pair of downward tube drawing belts (which represent by way of example the rotating means for downward tube drawing according to the invention) disposed at opposite sides, right and left, of the mandrel 7 so as to hold the mandrel therebetween. The downward tube drawing belts 9, 9 each comprises pulleys 10, 10a, upper and lower, and a belt body 11 trained over the pulleys 10, 10a for cyclic rotational movement. The lower pulleys 10, 10 are each rotatably supported in position by being held in contact with small rollers 8, 8 of the mandrel 7. The upper pulleys 10a, 10a are each rotatably supported by a lever 12 pivotable about a supporting shaft of the lower pulley 10, 10 so that they are pivotally movable toward and away from opposite upper sides of the mandrel 7. It is noted that pivotal movement of the upper pulleys 10a, 10a is effected as required by such reciprocating drive means as a cylinder (not shown) connected to the lever 12. Numeral 13 designates a cutter (corresponding to the cutting means of the invention) disposed at a position slightly above the mandrel 7, which comprises two cutter blades 14, 14a placed in opposed relation and adapted to cut tube 1 when they are moved toward each other. Shown by 15 is a transport conveyor horizontally extending below the mandrel 7 for sequentially transporting thereon container bottles 16 to a position below the mandrel 7. The tube fitting apparatus of the invention is of the above described arrangement. Nextly, one example of the tube fitting method of the invention will be explained in which the above described apparatus is employed. The continuous tube 1 is first paid out downward from the roll 2 through rotation of the feed rollers 3, 3 so that, as FIG. 1 illustrates, it is fed and transferred to the mandrel 7 for being fitted thereon. In this case, the continuous tube 1 is opened, though slightly, at its leading end by the action of the inner guide 4, so that it can be smoothly fitted on the mandrel 7. By moving respective upper portions of the downward tube drawing belts 9, 9 away from the mandrel 7 as shown, it is possible to fit the tube 1 on the mandrel by a suitable length as it is fed through the feed rollers 3, 3 without involving any undue catch relative to the downward drawing belts 9, 9. Subsequently, the cutter 13 disposed above the mandrel 7 is actuated to cut the continuous tube 1 as FIG. 2 shows. In this conjunction, it is noted that as can be seen from FIG. 1 (C), at a position right above the mandrel 7 the tube 1 is not open wide and is still in narrow folded condition. Accordingly, the tube 1 can be easily and quidkly cut by means of the two cutter blades 14, 14a, and a very neat cut effect can be obtained with respect to the cut end of the tube 1. During a cutting operation, it is preferable that the gap between the spring plate 4b and body plate 4a of the inner guide 4 is closed by bringing them toward each other; by so arranging it is possible to perform tube cutting operation in more satisfactory manner. Subsequently, as FIG. 3 shows, upper pulleys 10a, 10a of the downward tube drawing belts 9, 9 are moved inwardly and the belts proper 11 are driven to rotate while the pulleys 10a, 10a are in abutment with sides of the mondrel 7, whereby tube 1a cut to the predetermined length is lowered to a position below the mandrel 7. Through passage of the tube 1a over the mandrel 7 as it is lowered along the mandrel 7, the tube 1a is opened wide to provide sufficient opening over its full length and is dropped down while keeping itself in such condition. Therefore, the tube 1a drawn downward by the downward drawing belts 9, 9 is allowed to drop on a container bottle 16 transported on the transport conveyer 15 in synchronism with lowering operation with the tube 1a, so that it is fitted on a cap portion of the container bottle 16. It is noted, however, that during rotation of the lower pullyes 10, 10 of the downward drawing belts 9, 9, the small rollers 8, 8 of the mandrel 7 which are in contact with the pulleys 10, 10 are only allowed to turn idle so that the mandrel 7 is prevented from dropping down. In the above described embodiment, an inner guide 4 is provided at a level above the mandrel 7 so that the tube 1 fed toward the mandrel 7 through the feed rollers 3, 3 can be accurately fitted on the mandrel 7, but it is noted that in the present invention, such means as inner guide 4 is not essential. Aforesaid inner guide 4 is unnecessary in case where the tube 1 is characteristically such that its opening will not completly be closed as the tube 1 is cut by the cutter 13. It is noted, however, that as an alternative to the inner guide 4, means for forcibly opening the flat tube 1 through vacuum suction of the front end of the tube 1 at both sides thereof may be employed which is, for example, in the form of a vacuum type rotary belt with an open/close mechanism. In the above embodiment, in order to provide simplified support means for the mandrel 7, only respective upper portions of the downward drawing belts 9, 9 are pivotally movable toward and away from the mandrel 7, the mandrel 7 being securely supported in position by lower pulleys 10, 10 fixed in position at lower sides; but the invention is not limited by this arrangement. For example, as in FIG. 4 showing the prior art arrangement, it is quite possible to employ means such that bars 19 having a roller 18 at their front ends are in engagement with recesses 17 formed on sides of the mandrel 7 so that the mandrel 7 is held in position. However, such means involve one difficulty that the rollers 18 may interfere with operation for fitting of tube 1 on the mandrel 7. In such case, it is preferable to use such arrangement that the tube fitted on the mandrel 7 is positively transferred downward through rotation of the rollers 18. Of course, in the above embodiment, the downward drawing belts 9, 9 as a whole may be arranged to be movable toward and away from the mandrel 7. The rotating means 9, 9 for drawing the tube fitted on the mandrel 7 downward are not limited to such belt type means as are emplyed in the above described embodyment; for example, they may be of the roller type. In essence, the draw-dowaward rotating means employed in the appratus of the invention may be of any arrangement such that at least upper portions of the means are movable toward and away from the mandrel 7 so as to enable the tube 1 transferred and fed from the feed rollers 3, 3 to be fitted on the mandrel 7 and such that the means are rotatable while in contact with the mandrel 7 so as to allow the tube fitted on the mandrel 7 to be drawn downward to a position below the mandrel 7. Therefore, the means may not necessarily be provided in pairs of two as in the above described embodiment, but may be in any desired number. The arrangement of the cutting means 13 for tube cutting or of the mandrel 7 is in no way limited to that in the above described embodiment. For example, the mandrel 7 may be arranged to be movable straightforwardly or swingable in horizontal directions at same speed as packaging containers 16 in order to further speed up tube fitting operation. In this invention, there is no particular limitation with respect to the material and size of the tube 1. Further, kinds and types of objects to which tube fitting is applicable are by no means limited to containers such as bottles and the like.

Claims: 1. An apparatus for fitting a tube on a container or the like, comprising: feed rollers (3) disposed above a tube unfolding mandrel (7) to enable a flat folded continuous tube (1) to be transferred and supplied to the mandrel (7); rotating means (9) for drawing the tube downward which are movable at least at their respective upper ends toward and away from the mandrel (7) so as to enable the tube (1) transferred and fed from the feed rollers (3) to be fitted on the mandrel (7) and which are rotatable in contact with the mandrel (7) so as to enable the so fitted tube to be drawn downward from the mandrel (7); and cutting means (13) for cutting the tube (1); characterized in that the cutting means is disposed between the feed rollers (3) and the mandrel (7) said rotating means (9) for drawing the tube downward comprise upper and lower pulleys (10, 10a) disposed at upper and lower positions at opposite sides, right and left, of the mandrel (7), and belt bodies (11) trained over the upper and lower pulleys (10, 10a), the lower pulleys (10) being rotatably supported in position by being held in contact with small rollers (8) disposed at lower opposite sides of the mandrel (7) to thereby hold the mandrel (7) in position. 2. Apparatus according to claim 1 characterized in that the upper pulleys (10a) are pivotable for movement toward and away from upper opposite sides of the mandrel (7). 3. An apparatus according to claim 1 or 2, characterized by a flat thin plate-like inner guide (4) adapted to be inserted in the tube (1) fed from the feed rollers (3) so as to slightly open up the tube (1) and by backup rollers (5) disposed above the feed rollers (3) for locking further rollers (6) provided on an upper portion of the inner guide (4).

Inventors: HOTTA, YOSHINORI C/O FUJI SEAL INDUSTRY CO. LTD., NAGANO, SATOSHI C/O FUJI SEAL INDUSTRY CO. LTD., TAKAGAKI, NOBUYUKI C/O FUJI SEAL INDUSTRY CO. LTD.
Applicants: FUJI SEAL INDUSTRY CO. LTD.
Application year: 1988
Main classification: B67B5
IPC codes: B67B5, B65C3, B65B53