Apparatus for sequentially applying panels of plastic caps to groups of cans or jars

Abstract: An apparatus for sequentially applying panels (2) or row of plastic caps (7) to groups of cans (3) or jars, which comprises: a feeding path (4) for panels of caps (7), which is arranged above a belt conveyor (5) arranged to feed a sequence of cans (3), already filled with product and sealed and belonging to a can packaging line (6); means (9) for blocking each panel of caps (7) at the end of the feeding path (4); and pressure means (13) for applying each panel (2) or row of caps (7) to a group of cans (3) being fed on the belt conveyor (5).

Description: The present invention relates to an apparatus for sequentially applying panels of plastic caps to groups of cans or jars and the like containing beverages such as beer, wine and alcohol-free beverages in general. Plastic caps designed to cover a can or jar which contains a beverage have already been proposed mainly for the purpose of providing protection against dust or other foreign material at the upper part of the can, where the user will place his lips to drink. An example of a device for applying such caps to cans, is provided in the document EP-A-493 743. The main object of the present invention is to provide a simple and effective apparatus. Another object of the present invention is to provide an apparatus for sequentially applying panels of caps to groups of cans which can be used in a packaging line for cans or jars to perform a specific function, i.e., that of applying a protective cover on the top of each can. Another object of the present invention is to provide an apparatus as above which is simple in structure and reliable in operation. This and further objects which will become better apparent hereinafter are achieved by an apparatus according to the invention, which has the features set forth in claim 1. Advantageously, the said feeding path for cap panels is a gravity path along an inclined plane. Further aspects and advantages of the present invention will become better apparent from the following detailed description of some currently preferred embodiments thereof, given merely by way of non-limitative examples with reference to the accompanying drawings, wherein: Figure 1 is a diagrammatic front elevation view of a portion of a packaging line, including a belt conveyor and of a first embodiment of an apparatus according to the invention; Figure 2 is a front view of a panel of caps engaged by the stopping means at the end of the feeding path; Figures 3 and 4 are, respectively, a plan view and a side view of a panel of caps; Figure 5 is a reduced-scale top view of a detail of Figure 1; Figure 6 is a partial diagrammatic side elevation perspective view of another embodiment of the apparatus according to the invention; Figure 7 is a reduced-scale view of a chute for feeding panels of caps to the apparatus of Figure 6; Figure 8 is an enlarged-scale view of a detail of the chute of Figure 7; and Figure 9 is a view of a panel of caps, temporarily retained while waiting for the arrival of a front of cans. In the accompanying drawings, identical or similar parts or components have been designated by the same reference numerals. With reference to the above Figures, it will be noted that an apparatus 1 for sequentially applying panels 2 of plastic caps to groups of cans or jars 3 is constituted by a path 4 for feeding panels 2 of caps which lies above a belt conveyor 5 arranged to feed rows or orderly groups of cans 3, which have already been filled with product and sealed, and belonging a can packaging line, generally designated by the reference numeral 6. Typically, each ordered group or panel of cans comprises twenty-four (4x6) cans arranged side by side in a rectangular pattern, i.e., aligned both in the feeding and transverse directions along lines at right angles and thus, not in a quincuncial arrangement. Accordingly, each panel 2 of caps comprises a number of caps 7, preferably made of transparent plastic, which is equal in number to the cans of each group 3 with which the panel is designed to engage from above. The caps have the same arrangement as the cans, i.e., they form a matrix in which their centers are aligned along rows and columns which cross at right angles with one another. The various caps 7 are mutually connected and held together by burr or radial tabs 8 which can be easily broken. Preferably, the feeding path 4 of the panels of caps 2 is an inclined-plane sliding track, along which the panels 2 of caps advance in a controlled manner due to gravity one after the other. At the end of the descent path 4 stopping means are provided which are designed to stop each panel of caps 2 and comprise, for example, one or more hooks 9 which are directed toward the path 4 and are arranged to act as abutment elements for a respective tab 8 between two front caps of each panel 2 (Figure 2). The hooks 9 cause each panel to stop at such a height above a group of cans 3 being fed along the belt conveyor 5 that the edges of the caps 7 arranged along the lower front of the respective panel 2 reach a level which is distinctly lower than the top rim 10 of the cans 3 (Figure 1). The feeding path 4 also has, in its lower end part, a flat spring 11 made of spring steel for each column of caps 7; said spring projecting out longitudinally and parallel above the lower or front part of the lowest panel 2 and is, for example, supported by a cross-member 12 in cantilevered fashion. In a more advanced position in the direction of the movement of the cans 3 on the conveyor 5 with respect to the flat spring 11, pressure means are provided which comprise a transverse roller 13 freely rotatable about a horizontal axis, or a plurality of rollers which are mounted freely to rotate on the same axis and equal in number to the columns of caps 7. The roller or rollers 13 is or are supported, e.g., at an end of two cantilevered arms 14, the other end of which is secured to a supporting frame 15. Advantageously, instead of the roller or rollers 13 one or more elastically flexible pressers can be provided which have a low friction coefficient for the caps 7. Preferably, the roller or rollers 13 are spring-loaded by a pair of dampers or springs 16 arranged to keep the roller or rollers 13 resiliently pressed downwards. The operation of the above-described apparatus is quite simple. Panels 2 are loaded, one after the other, at the top of the feeding path 4. This operation can be performed by any suitable feeder, e.g. a sucker-fitted feeder arm, which picks up the panels 2 from a stack and transfers them in sequence to the path 4. The panels 2 slide sequentially down the inclined-plane path 4 until they abut against the hooks 9. At the same time, groups of seamed and sealed cans 3, equal to, and being arranged as, the caps 7 in the panels, are moved forwards by the belt conveyor 5. The various groups of cans 3, if desired, can be supported by respective trays, e.g. made of cardboard, as is well known in the art. The front row of each group of cans 3 passes below and to the side of the hooks 9 but abuts, with its upper edge 17, against the inner conical wall of a respective front cap 7 of the overlying panel retained by the hooks 9 and, whilst advancing on the conveyor 5, it pulls along the panel 2 in contrast with the thrust of the flat spring or springs 11 which assists or assist in ensuring and maintaining the rim 10 of the cans 3 in good mutual engagement with the caps 7, as shown in Figure 1. As the assembly formed by the group of cans 3 and by the respective panel 2 is moved forward by the conveyor 5, it passes progressively below the roller or rollers 13, where the panel 2 is gradually applied, row by row, on all the cans so that each can is engaged by snap action by a respective cap 7. The pack of cans each of which is now provided with a cap is then moved forward towards possible processing or handling stations provided in the packaging plant. Figures 6 to 9 illustrate another embodiment of the apparatus according to the invention, in which the feeding path 4 has a first upper straight portion 4a shaped as an inclined plane, along which the panels of caps 2 can slide with their outer top 7a having only rounded parts and as such generate less friction, and a second lower portion 4b which is arc-like and along which the panels turn over so as to arrive above the cans 3 with their concavity arranged downwards. The path 4a has, at its lower end, a stopping or blocking device 20 having one or more retention pawls 21 which are keyed on a horizontal shaft 22 which is mounted for rotation on fixed lateral supports 23. Therefore the, or each retention pawl 21 can be rotated between a working position, in which it can stop or block a panel of caps 2 moving along the path 4a by abutting against a respective tab 8 between two adjacent caps 7, and an inoperative position out of the path 4a. The pawls 21 can be actuated upon control by a fluid-operated jack 24 which is pivoted both at its piston rod and cylinder and is actuated by a control unit, not shown in the drawings, or by any other suitable actuation means. On the opposite side with respect to the stopping device 20 there is also provided a set of guillotine blades 25 which are aligned transversely to the path 4a and are spaced by a pitch which is equal to the pitch of the caps 7 of the panels of caps 2. The blades 25 are designed to selectively cut, according to a program, tabs 8 of preset transverse rows of tabs, for example as shown in Figure 9. Each blade 25 is connected to a suitable actuation means, e.g. a fluid-operated jack 26 which is fixed to a bridge-like support, generally designated by the reference numeral 27, and is energized by the control unit. Along the path 4a, the panels of caps 2 are preferably sterilized by means of sterilization units of any suitable kind, designated by the reference numeral 28. Once each panel 2 has arrived at the end of the path 4b with the concave portion of the caps 7 facing downwards, it strikes from below one or more resilient laminae 29 (Figure 6), which are supported in a cantilevered manner by a transverse shaft 30 by means of an adjustment screw 32. Moreover the said panel is engaged by a plurality of pins 33, possibly provided with a blade-like tip 34, which are supported, in mutually spaced relationship by a rotatable transverse shaft 35 which is spring-loaded by one or more return springs 36. Each pin 33 is held in the position shown in Figure 6 by the spring or springs 36, so as to abut against a respective front tab 8 of a panel 2 (Figure 9). As soon as a row of cans 3, the top of which has been preferably sterilized in any suitable manner, moves in the direction indicated by the arrow B (Figure 6) under the front caps 7 of the panel 2 retained by the pins 33, the said cans engage from the inside the caps 7 and cause the entire panel to pass below the roller or rollers 13, while overcoming the force of the springs 36 and forcing the pins 33 to rise. Said pins, if provided with a sharp blade-like tip 34, then (selectively) cut the longitudinal tabs 8 so as to separate each individual cap 7 or groups of caps 7 from the remaining caps in each panel according to a preset program. Once a panel or a row of caps has passed under the pins 33 and the last row of tabs 8 has been possibly cut, the pins 33 are immediately caused to return to their stopping position of Figure 6 to stop and/or temporarily retain the next panel or row of caps. It will be noted that the apparatus according to the present invention can be easily adapted to can packaging plants without requiring modifications in the working cycle of the plant. The above described apparatus is susceptible to numerous modifications and variations within the scope of the appended claims. Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims: Apparatus for sequentially applying panels or rows (2) of caps (7) interconnected by radial tabs (8) to groups of cans or jars (3), comprising: a feeding path (4) for said panels or rows (2) of caps (7), a belt conveyor (5) arranged to feed a sequence of cans or jars (3) already filled with product and sealed, and belonging to a can packaging line (6), and pressure means (13) for applying said caps to a group of cans or jars (3) being fed on said belt conveyor (5), characterized in that said feeding path (4) is arranged above said belt conveyor (5), stop means (9) are provided at the end of the feeding path (4) comprising at least one stop element (9) arranged to act as an abutment for a respective radial tab (8) connecting two front caps (7) of each panel or row (2) of caps, so as to stop the panel or row (2) of caps (7) at the end of the feeding path (4) at such a height above a group of cans or jars (3) being fed on said belt conveyor (5), that the edges of the caps (7) along the lower front of the panel or row (2) of caps (7) engage the top rims (10) of the cans or jars (3). An apparatus according to claim 1, characterized in that said path for feeding the panels (2) of caps (7) is a gravity path along an inclined plane. An apparatus according to claim 2, characterized in that said panel feeding path (4) comprises an upper straight portion (4a), which is shaped like an inclined plane and along which the said panels (2) of caps (7) slide by resting thereon with their outer top, and a curved lower portion (4b), along which the said panels (2) turn over so as to direct their concavity downwards. An apparatus according to claim 3, characterized in that said upper path (4a) comprises initial stopping means (20) which are arranged to stop, upon control, said panels (2) of caps (7) in a preset position. An apparatus according to claim 4, characterized in that said initial stopping means (20) comprise at least one stop pawl (21) movable between a working position, in which it stops a panel (2) of caps (7), and an inoperative position out of said upper path (4a), and actuation means (24) for said pawl or pawls (21). An apparatus according to any one of claim 3 to 5, characterized in that it comprises a plurality of cutting means (25) which are aligned transversely to said upper path (4a) and are designed to selectively cut or severe preset rows of caps (7) of a panel (2) of caps moving along said path (4a), and an actuation means (26) for each cutting means (25) which is controlled by a control unit. An apparatus according to any one of claim 1 to 6, characterized in that it comprises sterilization means (28) for said panels (2) of caps arranged along said feeding path (4a). An apparatus according to any of claims 1 to 7, characterized in that said at least one stop element (9) comprises a hook-like element facing towards the said feeding path (4). An apparatus according to any of claims 1 to 7, characterized in that said at least one stop element comprises a plurality of spaced pins (33), a rotating transverse support shaft (35) for carrying one end of said pins (33), and at least one resilient loading means (36) for said shaft (35). An apparatus according to claim 9, characterized in that at least one of said spaced pins (33) has its other end shaped like a sharp blade (34) to separate a row of caps (7) of a panel (2) of caps pulled by cans (3) on the conveyor (5). An apparatus according to any claim 3 to 10, characterized in that said feeding path (4) comprises, at its lower end portion, at least one flat spring (11) which projects longitudinally parallel to and above the lower front portion of said path (4) to resiliently press each panel (2) coming out from said path (4). An apparatus according to any preceding claim, characterized in that said pressure means (13) comprises at least one roller which is mounted free to rotate about a transverse axis to said path (4) and is located downstream of the said feeding path (4). An apparatus according to claim 12, characterized in that the or each roller (13) is located further downstream, in the direction of movement of said conveyor (5), of the said flat spring (11). An apparatus according to claim 12 or 13, characterized in that said roller or rollers (13) is or are elastically loaded by a pair of dampers or springs (16) arranged to keep them yieldably pressed towards said belt conveyor (5). An apparatus according to any of claims 1 to 11, characterized in that said pressure means (13) comprises at least a resiliently yieldable member with a low friction coefficient arranged to act on each panel (2) of caps (7) or row of caps (7).

Inventors: PEDROTTI CHIARA, PEDROTTI DONATELLA, PEDROTTI, CHIARA, PEDROTTI, DONATELLA
Applicants: PEDROTTI CHIARA, PEDROTTI DONATELLA, PEDROTTI, CHIARA, PEDROTTI, DONATELLA
Application year: 1998
Main classification: B65B7
IPC codes: B65B7