Patent Application
20100300040
The present invention relates to an apparatus for applying drinking straws to prefabricated packaging containers, comprising a rotary drive means for continuous belts of drinking straws wrapped in protective sleeves, guides for drinking straw belts and drinking straws, a conveyor for the packaging containers, means for separating drinking straws from the belt, as well as means for applying the drinking straw to the side wall of the packaging container.
Many single-use disposal packages for beverages are manufactured in so-called portion volumes, intended to be consumed straight from the package. The majority of these packages are provided with a drinking straw in a protective sleeve or envelope which is secured on the one side wall of the package. The packages, which may have parallelepipedic or tetrahedral configuration, are manufactured from a laminate with a core of paper or paperboard, with different layers of thermoplastics and possibly aluminium foil (Alifoil). On the one wall of the package, most often the upper or top wall, a hole has been punched out in the core layer and this hole is covered by the remaining layers of the laminate, which makes it possible to penetrate the hole with the drinking straw which accompanies the packaging container, and hereby consume the beverage contained in the package.
There have long existed machines in the art which apply drinking straws in their protective sleeves to packages which are conveyed through the machine. One such a machine is, for example, described in Swedish Patent Specification SE-424 847. These machines operate in that a belt of continuous drinking straw sleeves containing drinking straws is guided in towards and around a drive means. Adjacent the drive means there are devices for cutting the drinking straw belt into individual drinking straws enclosed in a protective sleeve or envelope, and means for applying this drinking straw on the side wall of the packaging container, the packaging container being advanced on a conveyor through the machine. The packaging container is, prior to the occasion of application, provided with so-called hot melt. Hot melt, which consists of molten plastic, adheres to the drinking straw sleeve and holds it in position when it sets. In order to be able to separate each drinking straw and apply the drinking straw on the package, the drive means must operate intermittently or at low speed, and the conveyor must advance the packages either intermittently or at low speed on each application occasion.
Another apparatus for applying drinking straws is disclosed in EP1042172, in which arms which are mounted on excentric shafts move in towards the drive means and pick up a drinking straw. Thereafter, the arms take the drinking straw back and apply it on the packaging container. The excentric shafts are disposed such that the arms, on the application of the drinking straw, accompany the packaging container. As a result, the conveyor with packaging containers need not be stopped on application of drinking straws. However, the design and construction involving arms placed on excentric shafts is relatively heavy and cannot be employed at high speeds. With today's state-of-the-art and more rapid filling machines in which the packaging containers are manufactured, the demands have increased to evolve more rapid machines for applying drinking straws.
One object of the present invention is to realise a machine for applying drinking straws on packaging containers which may operate more rapidly, since both drive means and conveyor operate continuously and the design and construction is simplified.
This and other objects have at least partly been attained by means of the present invention in that the apparatus of the type described by way of introduction has been given the characterising features as set forth in the characterising clause of appended claim 1.
An apparatus for applying drinking straws on prefabricated packaging containers comprises drive means for continuous belts of drinking straws wrapped in protective sleeves or envelopes, a conveyor for advancing packaging containers past the drinking straw applicator, means for separating drinking straws from the belt, as well as means for applying the drinking straw on the side wall of the packaging container. The means for applying the drinking straw comprises at least one excenter which is excentrically disposed on a shaft which is mounted adjacent the drive means, the excenter, on rotation of the shaft, being moved from an inner position to an outer position, the drinking straw being picked up at the inner position and applied on a packaging container at the outer position. As a result, there will be realised an applicator which, by rotation of a shaft provided with an excenter, may be run at high speed.
Preferred embodiments of the present invention have further been given the characterising features as set forth in the appended subclaims.
One preferred embodiment of the present invention will now be described in greater detail hereinbelow, with reference to the accompanying Drawings. In the accompanying Drawings:
a and 2b are a side elevation and a top plan view where excenters in an apparatus for applying drinking straws are located in an inner position; and
a and 3b are a side elevation and a top plan view where the excenters of the apparatus are in an outer application position.
The accompanying Drawings show only those details essential to an understanding of the present invention, and the remaining parts of the applicator machine, which are well-known to a person skilled in the art, have been omitted.
Referring to the Drawings,
Between each groove 6 on the circumferential surface of the drive means 1 there is disposed a slot 7. The slot 7 is intended to receive a device 8 for separating drinking straws 3 from the drinking straw belt 2. The device 8 for separating drinking straws 3 is in the form of a knife 9 fixedly secured in a holder 10. The knife 9 with its holder 10 are secured on an excentric shaft 11. The device 8 moreover includes a guide 13 which is fixed to a support arm 14. The support arm 14 is journalled about the centreline 15 of the drive means 1, and ensures that the guide 13 constantly holds the knife 9 directed towards the centre of the drive means 1. The excentric shaft 11 is disposed on a drive pulley 12 which is driven by a motor (not shown) which may be the same motor which drives the drive means 1. In such an event, a gear is disposed between the drive means 1 and the drive pulley 12 in that, for example, a driving belt drives the drive means 1 and the drive pulley 12 by means of pulleys of different sizes.
The apparatus further includes a device 30 for applying a drinking straw 3 on the side wall 18 of a packaging container. The device 30 for applying drinking straws includes one, two or more excenters 31a, 31b which, in the illustrated embodiment, are each mounted on its substantially vertical shaft 32a, 32b, as shown in
Along its diameter, the drive means 1 is provided with at least one peripheral groove 33a, 33b, see
The first servomotor (not shown) drives the drive means 1, and in its turn the drive means 1 feeds in the drinking straws 3 which are mounted on drinking straw belts 2. This first servomotor drives the drive means with the aid of a drive belt, but other power transmission systems are conceivable, such as friction driving or gear wheel driving. Normally, a gear is disposed in connection with the power transmission, so that the drive means may operate at a controlled, slow speed despite driving by a motor at high speed.
Adjacent the drive means, a conveyor 23 is disposed, and conveys finished packages from a packing and filling machine towards a carton packer or the like, where applicable. The packages are given a certain orientation and are controlled relatively accurately so as to pass the drive means in a well-marshalled manner and at a certain distance therefrom.
The drive means 1, which is disposed to rotate continuously, is the cardinal unit in the apparatus. It is the drive means 1 which conveys the drinking straws 3 around from the time when the belt 2 of continuous drinking straws 3 wrapped in protective sleeves or envelopes arrives at the apparatus by the intermediary of a number of guides (not shown in the Drawings), around the circumferential surface of the drive means 1, past the device 8 for separation to the device 30 for application. The device 8 for separation of drinking straws 3 moves with a gearing from the servomotor which drives the drive means 1, which depends upon the number of grooves 6 on the circumferential surface of the drive means 1. Thus, the gear ratio for straight drinking straws 3 may be 17:1, and the gear ratio for U-shaped drinking straws 3 may be 12:1, so that one drinking straw has been separated during the rotation necessary for the drive means 1 to apply one drinking straw on one packaging container 17. Other ratios are naturally conceivable.
The device 8 for separating drinking straws 3 from the belt 2 executes two relative movements during each separation sequence. On the one hand, the knife 9 is to reciprocate radially in relation to the drive means 1 and into a slot 7. On the other hand, the separation device 8 must accompany the substantially continuously rotating drive means 1 during the time the separation sequence is in progress. Both of these movements are realised by means of the drive pulley 12 and the excentric shaft 11 excentrically disposed thereon. Once the separation sequence is completed and the knife 9 has severed one drinking straw 3 in its protective sleeve or envelope from the continuous belt 2, the separation device 8 returns to its original starting position and there stands by awaiting a new separation sequence.
Moving tangentially in relation to the drive means 1 is the conveyor 23 which conveys through the apparatus the packaging containers 17 which are to be provided with drinking straws 3. The conveyor or conveyor path 23 moves at a speed which is synchronized with the speed of the remaining components in the apparatus. Before the packaging containers 17 arrive at the drive means 1, they have been provided on their side surface 18 with a number, preferably two, of glue spots which consist of so-called hot melt adhesive. The hot melt spots are to adhere to and, once they have set, retain the drinking straw 3 in its protective sleeve or envelope against the side wall 18 of the packaging container 17.
The device 30 for applying drinking straws 3 on the side walls of the packaging containers 17 rotates about the at least one excenter 31a, 31b so that it moves from its inner position to its outer position. During this displacement, the excenter 31a, 31b will entrain with it a drinking straw 3 which has been placed radially outside the inner position of the excenter 31a, 31b, as a result of the rotation of the drive means 1, to the outer position. When the excenter is in its outer position, the drinking straw is pressed in place on that packaging container which is positioned on the conveyor path and which, on its side wall, is provided with one or more spots of hot melt adhesive. Thereafter, the finished package is conveyed off by the conveyor 23, a new package is advanced and provided with hot melt, a new drinking straw 3 is advanced by the drive means 1 and the excenter is rotated and once again applies a drinking straw 3 on the packaging container. The movement of the drinking straw 3 is substantially straight out from the drive means 1, at right angles to its axis, when it is moved by the excenter 31a, 31b. At the end of the movement of the excenter 31a, 31b, the drinking straw will for a brief time accompany the excenter and then is moved in the direction of movement of the package 17. This facilitates application of drinking straws 3.
The above-described procedure requires synchronization of a number of movements. The whole process is started in that a photocell or similar sensor senses the presence of a packaging container 17. In a first step, hot melt adhesive is then applied to the side wall 18 of the container with the aid of a hot melt applicator (not shown). Thereafter, the container is advanced by the conveyor 23 to the correct position ahead of the drive means 1. When this position is confirmed, by another sensor (not shown), the servomotor for the shaft 32a, 32b is activated for applying the drinking straw 3. The excenter 31a, 31b is driven from its inner position to its outer position and then entrains a drinking straw. Thereafter, the drive means 1 is driven for advancement of a new drinking straw. In association with this rotation, a separation device will be activated so as to separate a drinking straw 3 from the belt of drinking straws. This procedure must be completed before a drinking straw can be applied on a container, but may be carried out slightly earlier so that a plurality of drinking straws lies separated in the grooves 6 in the drive means 1.
The synchronization of these different driving and activation phases is managed by an automation system (not shown) which moreover receives data from different sensors with regard to the current position of the next packaging container. This is vital in connection with the application of hot melt adhesive on the side wall of the packaging container, and in connection with the application of the drinking straw. The two servomotors, for the drive means 1 and the device 30 for applying drinking straws, are thus completely and totally synchronized in terms of software. The conveyor 23 may be synchronized with the drive means 1 and the device 30 for applying drinking straws, but may also be completely independent. Instead, the drinking straw applicator then responds to sensor signals which indicate where the relevant package is located.
It is advantageous if the packing and filling machine is provided with a positioning device (not shown) in order, as far as is possible, accurately to orientate the packages in the same manner each time. Then, the drinking straw may be applied at the same position on all packages, i.e. on a panel or side wall 18 intended for this purpose.
As will have been apparent from the foregoing description, the present invention realises an apparatus for applying drinking straws 3 on packaging containers 17 at high speed, since both the drive means 1 and the conveyor 23 move substantially continuously, and where the design and construction are simple and the moving parts are of slight mass. The drive means and other parts included may also be driven intermittently, and at varying speed, in response to signals from different sensors. In the event of a high flow of packages past the drinking straw applicator, it will operate more or less continuously, while in the event of a low flow, it will operate when necessary and at a lower speed of the drive means 1. The device 30 for applying drinking straws 3 moves, in one embodiment, at a speed which is adapted to the speed of the conveyor 23.
The device 30 for applying drinking straws on the packaging container 17 is totally free-running from the drive means 1, and its excentric shafts 32a, 32b execute substantially a rotation movement. This is converted to a movement in the radial direction of the drinking straw as a result of the positioning of the excenter on the shaft. This excenter is of low mass, which makes it possible to drive it at high speed without inertia forces becoming excessively great.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0800271-9 | Feb 2008 | SE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/SE2009/000035 | 1/29/2009 | WO | 00 | 8/10/2010 |
