Apparatus for opening a flat tube and fitting same on a container or the like

Abstract: An apparatus for opening flatly folded tubes (5) of synthetic resin or the like material and fitting same on containers (8) or the like objects. Operation of fitting opened tubes on the objects can be performed without requiring any complicated movement of the objects. Each opened tube (5) and each object (8) are transported in same direction and, in the course of this transport, either the tube or the object is moved gradually toward the other so that the one is fitted on or inserted into the other.

Description: The present invention relates to an apparatus for opening a flat tube and fitting same onto an individual container. From the US patent No. 4,562,684 it is known an apparatus for opening a flat tube and fitting same onto an individual container, comprising a spread section provided with a pair of opposed cyclically moving members for successively spreading and opening flats tubes while transporting said tubes by holding them at opposite side portions thereof, and a transport section provided under said pair of cyclically moving members for horizontally transporting said individual container in the same direction. Always according to said prior art, the spread section in which said members diverge from one another, is aligned with the transport section and inclined downwardly in the transport direction so that said spread members, situated on both sides of and straddled over said individual containers, fit said tubes, which have been opened by said members onto said individual containers from above. The Japanese patent publication JP-B 44 18 473 discloses an apparatus comprising a transport section and a spread section aligned with and moving in the same direction as the transport section, whereby the spread section is of linear shape, providing the same advantage of accurate synchronisation. From Japanese Patent 62-122918, it is known an apparatus (see figures 5a, 5b of the here annexed drawings) for opening a flat tube and fitting same onto an individual container, comprising a spread section, provided with members for successively spreading and opening flat tubes while transporting said tubes by holding them at opposite side portions thereof and a transport section provided under said pair of cyclically moving members for effecting ascent and descent and horizontal movement of said container. The apparatus according to the present invention differs from what is disclosed in US-A-4 562 684 characterized in that said pair of opposed cyclically moving members are comprised of cyclically movable suction belts with air permeability, vacuum suction chambers are respectively provided inside of each of said suction belts so as to apply vacuum force of suction through said suction belts and suck the outer surface of said tube, said suction belts are of linear shape and comprise a transfer section in which said suction belts move in parallel relationship, and a spread section in which said belts diverge from one another in relation to the trasport direction of the containers, said spread sections of said suction belts are inclined downwardly in said transport direction so that said spread sections and said vacuum suction chambers provided on the spread sections are on both sides of and straddle over at least the upper portions of said individual containers, thus fitting said tubes, which have been opened by said suction belts, onto said individual containers from above. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a first embodiment of the invention, wherein (a) is a side view; (b) is a plan view, and (c) is a plan view of a device for spreading and opening and transporting tubes; FIG. 2 illustrates a second embodiment of the invention, wherein (a) is a side view; and (b) is a plan view; FIG. 3 is a fragmentary perspective view showing another form of transport device for transporting objects to be wrapped; Fig. 4 is an explanatory fragmentary view showing a tube forcing device in another embodiment of the invention; and Fig. 5 illustrates a prior art-arrangement, according to the cited Japanese patent 62-122 918 wherein (a) is a plan view; and (b) is a fragmentary side view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the invention will now be described. ( Embodiment 1 ) In FIG. 1, numeral 7 designates a transport device for transporting containers 8 (objects to be wrapped) on and along a horizontal path 11. The transport device 7 comprises a pair of side belts 13, 13a guided by a plurality of pulleys 12, 12a for cyclical movement in horizontal directions, the side belts 13, 13a being disposed in opposed relation across a transport path 11. The side belts 13, 13a are provided respectively with attachments 14, 14a which project from respective outer sides of the side belts 13, 13a at a plurality of locations spaced at a predetermined pitch, and which are adapted to abut rear sides of individual containers 8 supplied onto the transport path 11 to successively push the containers 8 forward. Therefore, the transport path 11 need not necessarily have a function to positively transport the containers, but it may be comprised of a drive belt of a belt conveyor or the like. Above the transport device 7 there is provided a device 1 for transporting and opening flat tubes 5, which device 1 will be described below. In FIG. 1 (c), 2, 2a designate a pair of cyclically movable suction belts (which correspond to cyclically moving members) with air permeability which are arranged in opposed relation and guided by a plurality of pulleys, the belts 2, 2a being spaced so that the distance L between them is small at an upstream portion thereof and becomes wider toward leading ends thereof. The belts 2, 2a, as shown in FIG. 1 (a), are forwardly down-sloped so that their forward end portions are positioned across the container transport path 11 of the transport device 7 in straddling fashion. Inside the suction belts 2, 2a are respectively provided vacuum suction chambers 4, 4a operative to apply vacuum force of suction through the air permeable belts 2, 2a over respective ranges A₁ and A₂ shown. A feeder unit 6 for supply of flat tubes 5 is disposed beside the one suction belt 2a, the feeder unit 6 being such that after a continuous tube is cut by a cutter into pieces of desired size, the cut tubes are supplied onto the belt 2a for being sucked onto the outer surface of the latter. The arrangement of the embodiment having now been described, the manner of operation will be explained by way of example. Desired flat tubes 5 having prints or the like suitably applied thereto are first supplied successively by the feeder unit 6 onto the outer surface of the one suction belt 2a of the tube opening and transport device 1 at predetermined intervals for being held in suction thereagainst so that the tubes 5 are delivered into the space between the pair of belts 2, 2a. The flat tubes 5 are then held in suction at opposite sides by and between the two belts 2, 2a and are progressively spread and opened as they are transported forward (in the direction of arrow a). The suction belts 2, 2a are forwardly down-sloped as shown in FIG. 1 (a), and accordingly individual tubes 5 are gradually moved downward toward individual containers 8 transported on the transport device 7 at the predetermined pitch so that the tubes 5 are individually fitted on the containers 8. At an initial stage of the process of each tube 5 being fitted on a container 8, the tube 5 partially fits on a top portion of the container 8 as may be seen at M in FIG. 1 (a), and therefore accurate fitting can be achieved even if the tube 5 is not wide open. Subsequently, as the tube 5 is opened wide while being transported forward, the tubes 5 is further fitted on the container 8 toward a larger diameter portion thereof while being guided along the outer periphery of the container 8. This insures more accurate tube fitting. Both each tube 5 and each container 8 are transported in same direction, and the tube 5 is gradually moved downward toward the container 8 for being fitted on the latter from above. Therefore, the movement of the tube 5 can easily be synchronized with that of the container 8 and, even during high speed operation, the tube 5 can be accurately fitted on the container 8. After each tube 5 is satisfactorily fitted on a container 8, the tube 5 as is fitted on the container 8 is transported forward by the transport device 7 for transfer to a next following stage. At the next stage, the process of, for example, heat shrinking the tube 5 for bringing it into bond with the side of the container 8 is carried out. It can be arranged that holding in suction of each tube 5 by the belts 2, 2a is released at a position at which the process of fitting of the tube 5 on the corresponding container 8 ends. Through such arrangement it is possible to smoohly effect shifting of the tube 5 toward the container 8. Such arrangement can readily be adjusted by suitably setting the position of the chambers 4, 4a operative to apply vacuum force through the belts 2, 2a. If the tube 5 is still held in suction against the belts 2, 2a at the end of the process of tube fitting, the tube 5 can readily be separated from the belts 2, 2a through the force of transport for the container 8, with no inconvenience being caused to the process of fitting tubes 5. ( Embodiment 2 ) In the above described embodiment, each tube 5 is fitted on each corresponding container 8 to the bottom thereof. Where the tube 5 is used as a shrink label or the like, however, there may be cases where it is desired that the tube 5 should be partially fitted on the container 8, for example, only on an upper portion thereof. The present embodiment is suitably applicable in such case. The apparatus shown in FIG. 2 is identical in fundamental features with the apparatus of Embodiment 1 ( therefore, devices and parts similar to those of Embodiment 1 are designated by like reference characters, which applies to other embodiments as well). Attachments 14b, 14c projecting from side belts 13, 13a of a transport device 7 for transport of containers are adapted to abut containers 8 at a predetermined level to enable the containers 8 to be transported forward. Heating units 15, 15 for heater-heating or hot-air heating are provided downstream of the exit-side end of suction belts 2, 2a. According to the arrangement of the present embodiment, when each tube 5 spread and opened between the suction belts 2 and 2a is fitted on a corresponding container 8, the tube 5 is stopped by attachments 14b, 14c so that it is not allowed to descent to the level of the bottom of the container 8. When, after fitting of the tube 5 has ended, the tube 5 is heat-shrunk through heating by the heating units 15, 15, being then brought into bond with an upper portion of the container 8. Thus, the tube 5 is no longer liable to drop toward the bottom of the container upon subsequent movement of the attachments 14b, 14c away from sides of the container 8. Accordingly, the container 8 with the tube 5 as fitted in position on the upper portion of the container 8 can be supplied to a next following operating stage. In the first and second embodiments described above, the transport device for container transport is constructed as a conveyor provided with attachments for pushing containers forward. However, the construction of the transport device 7 in the invention is not limited to that shown in the embodiments. For example, the transport device 7 may be in the form of a general-purpose conveyor having no side belt or the like, such that containers 8 are loaded and carried forward on the conveyor. However, for the purpose of transporting light-weight containers, it is desirable from the standpoint of practical applicability to employ a transport device having a positioning function for containers 8 so as to prevent possible deviation in container 8 positioning. For such transport device, one as shown by way of example in FIG. 3 may be employed such that containers 8 are transported while being held in suction on a belt 16 provided with venting holes or the like for application of vacuum suction force. Where a tube 5 is partially fitted on an upper portion of a container 8, attachements 14b, 14c for stopping tubes 5 as in the above mentioned embodiment can be employed which concurrently serve for the transport of containers. This arrangement is desirable from the standpoints of apparatus streamlining and simplification, but it is understood that the invention is not limited by such arrangement. For example, the attachments 14b, 14c may be separate from the container transport device 7 and, without their being used for clamping containers, they are transported synchronously with containers 8 so that the attachments 14b, 14c are used only for the purpose of stopping tubes 5. It is noted that for the purpose of stopping tubes 5, the attachments may be arranged at spaced locations corresponding to front and rear sides of individual containers 8, irrespective of whether or not they are abuttable in relation to the containers 8. The configuration of such attachments is not limited in any way. There is no particular limitation with respect to drive means for the attachments. Such attachments may be provided at locations corresponding to any one of the following positions: front, rear, or side of each container 8. Depending upon the shape of each container 8 and the tube fitting position with respect to the container 8, such attachment need not necessarily be provided. Where no such attachment is provided, the side belts 13, 13a can perform the function of the attachments as each tube 5 fitted on a container 8 is placed on edge portions of the side belts 13, 13a. In the foregoing embodiments, the object for tube fitting is exemplified by a container. However, the scope of application of the invention is not limited to such kind of object, and the invention may be applicable to various other kinds of objects. Likewise, various kinds of flat tubes 5 may be used, and they are not limited to shrink labels or cap seals of the heat shrink type. According to the invention, where the cyclically moving members 2, 2a for transporting and opening flat tubes 5 are forwardly down-sloped, not entire track range of tube transport of the cyclically moving members 2, 2a must be sloped, as is the case with the foregoing Embodiment 3 in which the transport device 7a for transport of object 8 has a forwardly down-sloped portion C. For example, even where the cyclically moving members 2, 2a have a non-sloped portion for horizontal transport on the upstream side of the transport track, the arrangement comes under the technical scope of the invention, if the cyclically moving members 2, 2a have a down-sloped portion on the downstream side. Further, it is possible to provide a forcing unit 40, as shown in FIG. 4, for forcing a tube 5 fitted on each object 8 into position relative to the object at a downstream location in the device 1 for transporting and opening flat tubes. The forcing unit 40 has an up and down movable arm 41 positioned above the object, the arm 41 being provided at its lower end with a pad 42 adapted to abut the top of the tube 5 fitted on the object 8 for forcing the tube down. Through the provision of such forcing means it is possible to achieve more accurate fitting of the tube 5 in position relative to the object, even if the tube 5 is not properly positioned when it is fitted on the object 8. There is no limitation whatever as to means for feeding tubes 5 to the cyclically moving members 2, 2a. The provision of heating units 15 for heat-shrinking tubes 5 passed through the process of tube fitting relative to objects 8 is, needless to say, applicable to only such partial tube fitting operation as exemplified in the foregoing Embodiment 2.

Claims: An apparatus for opening a flat tube and fitting same onto an individual container comprising a spread section (1, fig. la) provided with a pair of opposed cyclically moving members (2, 2a, fig. lb) for successively spreading and opening side portions thereof,and a transport section (7, fig. 1a) provided under said pair of cyclically moving members for horizontally transporting said individual containers (8) in the same direction characterized in that said pair of opposed cyclically moving members (2, 2a fig. 1b) are comprised of cyclically movable suction belts with air permeability, vacuum suction chambers (4, 4a) are respectively provided inside of each of said suction belts (2, 2a) so as to apply vacuum force of suction through said suction belts and suck the outer surface of said tube, said suction belts (2, 2a) are of linear shape and comprise a transfer section in which said suction belts (2, 2a) move in parallel relationship, and a spread section in which said belts (2, 2a) diverge from one another in relation to the transport direction of the containers (8), said spread sections of said suction belts (2, 2a) are inclined downwardly in said transport direction so that said spread sections and said vacuum suction chambers (4, 4a) provided on the spread sections are on both sides of and straddle over at least the upper portions of said individual containers (8), thus fitting said tubes (5), which have been opened by said suction belts (2, 2a), onto said individual containers (8) from above. An apparatus for opening a flat tube and fitting same on a container as set forth in claim 1, wherein attachments (14b, 14c figgs. 2a, 2b) capable of stopping individual tubes (8) fitted on corresponding containers are arranged along the path of transport of the containers at opposite sides thereof for arresting the descent of the tubes at a desired level relative to the containers, said attachments being movable in synchronism with the containers. An apparatus for opening a flat tube and fitting same on a container as set forth in claim 1 and 2, wherein there are provided forcing means (41, 42, fig. 4) for forcing the tubes (5) fitted on the containers (8) into position relative to the containers. An apparatus as set forth in one of claims 1 to 3, wherein heating means for heating tubes to cause them to shrink are disposed in the stage of transport of the containers, downstream of the position at which the process of fitting is completed with respect to each container and a corresponding tube as opened and transported by the cyclically moving members.

Inventors: NAGANO SATOSHI, NAGANO, SATOSHI
Applicants: FUJI SEAL IND CO LTD, FUJI SEAL INDUSTRY CO. LTD.
Application year: 1990
Main classification: B65C3
IPC codes: B67B5, B65C3, B65B7