MACHINE FOR FILLING RECEPTACLES WITH PRODUCTS IN ACCORDANCE WITH A PREDETERMINED PATTERN

Abstract: A machine (1) for filling receptacles with products in accordance with a predetermined pattern, comprising: simultaneously operable product feeding means cooperating with associated oscillating channels (13,14) for conveying the products in single file and associated supports each for supporting a single product, at least one rotatable carrier frame with vertically extending pneumatic cylinders (37,39) whose pistons are at their lower ends provided with suction cups (41,43) communicating with a vacuum source, a carriage mounted for alternating transverse displacement and means for the longitudinal advance displacement of at least a pair of receptacles, and coordinated barrier and transverse product retainer means, and a program control unit (80).

Description: The present invention relates to a machine for filling receptacles with products in accordance with a predetermined pattern, which machine gives rise to several advantages with regard to its appointed operation as will be pointed out as the description proceeds, apart from others inherent to the operation and construction of the machine. Receptacle filling machines, more specifically, machines for filling crates such as wooden crates of cardboard boxes, with various products, particularly fruit and certain vegetables, that is, generally vegetal products of a more or less round shape, are already known (generally under the designation of crating machines). Amongst these machines there are certain ones which pick up and convey the products by the action of vacuum-generated suction, to which purpose they are equipped with flexible suction cup devices whose flexibility is selected in accordance with the greater or smaller resistance of the surface of the products to be handled, so as to ensure an optimum coupling effect between the suction cups and the products and thereby limit vacuum losses. Machines of the type defined above are operable to form layers of fruit or other more or less round products in crates or the like, in accordance with predetermined geometrical patterns normally devised so that the individual products in each layer and from one layer to another one are closely packed, to thereby stabilize the contents of the crate for shipping, and for achieving a pleasing appearance at the point of sale, when the product is to be displayed to the potential customers in the opened crate. The known machines of this type (US-A-3590551) operate to transfer fruits or the like from a product feeding station into respective crates themselves supplied via suitable conveyor devices to thereby automatize the formerly manual packing operation. This transfer operation requires the simultaneous use of several suction cups for the transfer in a single operation of a complete layer or a complete row of the fruit. When the crate is designed to hold more than one layer of the products, it is then lowered for the transfer of the next layer of the products to be stacked on the first layer. The simultaneous transfer of complete layers of products requires the provision of two transfer stations in the machine for a single crate, so as to enable successive layers of distinct and complementary patterns to be stacked. These provisions obviously result in higher costs of the machine, an increase of the required installation space, an increase of maintenace expenses, and most important, in the necessity of exchanging various elements and components and of carrying out various adjustments for adapting the machine to different kinds and sizes of products and to different configurations-in-space to be assumed by the products when packed in various receptacles, within certain limits imposed by the functional components and the overall construction of the machine. Depending on the type of products to be packed, these adaptations may become necessary several times in a single day with the consequent down-times, resulting in a diminished efficiency or output of the machine and involving additional manual labour expense for the actual adaptation and subsequently indispensable testing operations. The transfer of complete rows of products results in somewhat similar disadvantages; in one embodiment, a machine of this type comprises means for deactivating selected ones of the suction cups for obtaining desired complementary configurations of alternate rows in a single layer, resulting in similar shortcomings as described above. The machine according to the invention for filling receptacles with products in accordance with a predetermined pattern is of the type comprising means for feeding the products to be packed, means for the suction-supported transfer of the products from the feeding zone to their position in a respective receptacle in accordance with a predetermined and selected three-dimensional pattern, and means for conveying the receptacles to be filled and for discharging them after they have been filled, and additionally comprising a frame structure supporting the functional components of the machine, means for actuating respective functional components, and means for controlling, activating and monitoring its operation. According to the invention, a machine of this type is characterized in that it comprises at least one pair of simultaneous feeding means terminating in respective oscillating conveyor troughs each for aligning and conveying the products in a single file and discharging them one by one onto a respective concave support the bottom of which is formed as a vibratory brush, in that said product transfer means comprises at least one carrier frame mounted for rotation about a vertical axis in successive steps of an angle equal to the result of dividing 360° by twice the total number of concave supports and subsequent multiplication with the number of rotatable carrier frames, said vertical axis being located equidistant from the centers of the associated concave supports, said carrier frame carrying a number of vertical pneumatic cylinders disposed at equal circumferential spacings corresponding to the angle of a rotary step of the carrier frame, and connected to respective solenoid valves communicating with a compressed-air source, the pistons of said cylinders being tubular and having their upper ends connected to respective vacuum sources themselves connected to said compressed-air source, the open lower ends of said pistons being provided with preferably bellow-shaped suction cups, in that said means for conveying receptacles comprise means for longitudinally advancing the receptacles towards the exit of the machine in combination with a carriage provided with means for its alternating transverse displacement and at least one pair of cross-barrier means coordinated with respective receptacles to be filled for maintaining the products in position during the formation of the rows thereof of each layer in at least a pair of juxtaposed and simultaneously filled receptacles, said carriage being additionally provided with at least one pair of transverse retainer means for retaining each row of the products after its formation in each of said pair of juxtaposed receptacles, said retainer means being provided with means for their alternating longitudinal displacement, their displacement towards the receptacle exit being coordinated with the intermittent advance of the receptacles being filled by increments equalling the distance between the axis of one row of the products and that of the next row to be formed, and an inactive return displacement by the increment for retaining the subsequent row once it is completed, and in that there is provided a program control unit for controlling and monitoring the various operative phases, including different and selective configurations-in-space of the products in said receptacles in accordance with the capacity of the latter. The machine according to the invention for filling receptacles with products in accordance with a predetermined pattern eliminates the described shortcomings of known machines of this type, and gives rise to numerous advantages deriving amongst others from its versatility in handling products and receptacles of varying sizes and proportions, and from its ability to vary the distribution-in-space of the products in respective receptacles, that is, the configuration of each layer of the products and the arrangement of layers relative to one another, and all this readily, rapidly and in a reliable manner. The oscillating troughs for conveying the products and the concave supports with their vibratory brush bottoms are effective to directionally position products of a more or less flattened shape, such as for instance tangerines, so that their flattened bottom face comes finally to rest on the concave support, this position being maintained until these products are deposited in the receptacle being filled, resulting in a more pleasing appearance of the filled receptacle in view of its being displayed to potential customers. The machine according to the invention for filling receptacles with products offers the above described advantages in addition to others which will become readily evident from the following more detailed description of the machine, given for facilitating the understanding of the characteristics disclosed above, and at the same time disclosing various details, the present description being to this purpose accompanied by a set of drawings representing a practical embodiment of the machine according to the invention for filling receptacles with products in accordance with a predetermined pattern, solely by way of example and without limiting the reach of the present invention. In the drawings, fig. 1 shows a lateral elevation of the machine from the right, fig. 2 shows a front end view of the machine, fig. 3 shows a top plan view thereof, figs. 4, 5 and 6 represent respectively a sectional view taken along the line IV-IV in fig. 6, a sectional view taken along the line V-V in fig. 4, and a top plan view of product feeding means, figs. 7 and 8 respectively show a front end view in the direction A in fig. 6 and a sectional view taken along the line VIII-VIII in fig. 7, figs. 9 and 10 respectively show a lateral elevation from the left and a top plan view of product transfer means figs. 11 and 12 respectively show a lateral elevation from the right and a front end view of receptacle conveying means, and figs. 13, 14 and 15 respectively represent a lateral elevation from the right, a front end view and a top plan view of cross barrier means and retainer means for retaining rows of products. The machine for filling receptacles with products in accordance with a predetermined pattern is depicted in the drawings in the form of a practical embodiment comprising a frame structure 1 for supporting and mounting the various functional components and for permitting the machine to be stood on a mounting floor, in the present example at an adjustable height, and to be anchored thereon if so desired. the top portion of frame structure 1 carries certain topside components of the machine, amongst which the means for feeding the products to be packed, and the means for transferring the products from the feeding means to respective receptacles to be filled. In the following description, the front end part of the machine corresponds to the entry section for the receptacles to be filled, and the rear end part corresponds to the exit section for the receptacles filled with the products. At the exit section of the crating machine and at a level above the actual exit of the filled crates the illustrated embodiment is provided with a pair of simultaneously operating feeding means comprising two endless conveyor belts 2 and 3, an oblique wall 4 extending across the full width of this part of the machine for retaining and guiding the products to be packed, and another wall 5 which in the present case is inclined at a smaller angle than wall 4 for retaining the conveyed products at the other side, these details being particularly shown in figs. 4, 5 and 6. The simultaneously operable feeding means terminate at and discharge the products into individual oscillating troughs 6 and 7, the zones of transition from each endless belt 2, 3 to the associated oscillating trough 6, 7 being provided with detector means for controlling the deactivation and activation of the endless belts, specifically for activating them in response to the absence of products at the inlet ends of the oscillating troughs, and deactivating them in response to sensing the troughs to be filled with products. As illustrated in fig. 5, an in the present case pneumatic vibrator 8 is connected to oscillating trough 6, the latter being mounted in a floating manner permitting it to vibrate by means of elastic pads 9 having their upper ends connected to the trough, and their lower ends to an equilibration mass 10. The endless belts 2 and 3 are driven by respective motors 11 and 12 through suitable speed-reducing transmissions of the gear or belt-and-pulley type, the two motors and their accessories being mounted adjacent opposite sides of the two belts so as to occupy less space in combination. The oscillating troughs 6 and 7 open into narrow oscillating channel sections extending transversely relative to the longitudinal axis of the machine, while troughs 6 and 7 extend in the longitudinal direction and endless belts 2 and 3 are also disposed in the transverse direction (fig. 6). The narrow oscillating channel sections 13 and 14 are mounted in a floating manner similar to oscillating troughs 6 and 7 by means of elastic pads 15 (fig. 7), and activated by associated vibrators 16 which may be of the pneumatic type similar to vibrators 8 of oscillating troughs 6 and 7, the latter being optionally provided with suitable counter-weights. Disposed in each channel section 13 and 14 is a detector 17 for controlling the supply of the products to be packed, and the exit end portion of each channel section is provided with a for instance rod-shaped stop 18 carried by a hinged plate member 19 itself connected to the piston rod of a for instance pneumatic cylinder 20 (figs. 6 and 7). The extension of the piston rod of cylinder 20 causes plate member 19 to pivot so as to lower rod-shaped stop 18 to thereby permit the passage and discharge of one of the products which have been automatically aligned in a single file in the respective oscillating channel section 13 or 14 as a result of the latter's configuration, dimensions and proportions in combination with their vibration and a certain inclination towards their outlet ends. From the single files formed in each of the oscillating channel sections, the products are discharged one by one onto respective concave supports 21 and 22 (figs. 6, 7 and 8) the bottoms of which are formed by vibratory brushes 23 and 24. The vibration of brushes 23 and 24 is obtained in an exceptionally simple manner by connecting them to the associated oscillating channel sections 13, 14, while the concave supports are mounted on the frame structure 1 of the machine with the aid of mountings preferably including means for adjusting the height of the concave supports 21, 22 in accordance with the size of the products to be handled. Disposed in front of each concave support 21, 22 is a detector 25 and 26, respectively, for monitoring the one-by-one discharge of the products conveyed by the associated oscillating channel section 13 or 14 in cooperation with the respective rod-shaped stop 18. The previously described vibrators and cylinders may of course also be of the hydraulic type rather than of the pneumatic type, or be replaced by other devices for generating vibrations and for actuating the respective components. The oscillating troughs and channel sections and the concave supports serve for conveying the products and are at the same time effective to orient products of a more or less flattened shape, such as for instance tangerines, so that their flattened bottom face comes finally to rest on the concave supports, this orientation being subsequently maintained until the products have been deposited in the receptacles and thereafter, to thereby create a pleasing appearance of the products as they are displayed for sale. Disposed at the geometric center 27 (fig. 6) and equidistant from the geometric centers of the two concave supports 21 and 22 is the likewise geometric center 28 of a vertical shaft 29 of a rotatable carrier frame composed of the said shaft 29, a horizontal disc 30 and two horizontally extending diametral arms 31 arranged in the shape of a cross, the shaft 29, disc 30 and pair of arms 31 being rigidly connected to one another. Together with disc 30, shaft 29 is mounted on a tubular sleeve 32 itself mounted by means of suitable bearings for rotation about a column 33 the lower end of which is fixedly connected to frame structure 1 (figs. 1, 2, and particularly 6, 9 and 10). Disc 30 may be formed with holes or cutouts for reducing its inertial mass. The carrier frame is incrementally rotatable in successive steps the angle of which equals the result of dividing 360° by twice the total number of concave supports and then multiplying with the number of rotatable carrier frames, the angle in the present example being thus 90° (90° = 360°/ /2x2 concave supports x 1 rotatable carrier frame). The incremental rotation of the carrier frame is accomplished with the aid of a toothed rim 34 of the disc 30 camming with a pinion 35 of a step motor 36 mounted on the main frame 1 of the machine. The carrier frame of the present example carries four vertically disposed pneumatic cylinders 37, 38, 39, 40 - the employ of hydraulic cylinders or equivalent devices being also possible - disposed at circumferentially equidistant spacings corresponding to the angle of the rotational steps of the carier frame, that is, 90° in the present example, the cylinders being of a special construction, in that their pistons are each composed of two telescopically joined tubular members provided with suitable sliding seals, the smaller-diameter inner tubular member being fixed to the upper part of the cylinder, while the outer tubular member is vertically displaceable up and down and has its lower end connected to a suction cup 41, 42, 43, 44. The interior of the two telescopically joined members of the piston is used for supplying the respective suction cup with a vacuum which in the present example is transmitted via pipe connections designated at V in figs. 9 and 10 from a vacuum source 45 to the top portion of the respective cylinder. Each of the vacuum sources 45 is designed to generate a vacuum by the Venturi effect and is therefore connected to the compressed-air circuit of the machine via a respective solenoid valve 46 (fig. 10). In addition, each of the vertical cylinders is connected to the compressed-air source via a respective solenoid valve 47 as indicated at A in fig. 9. The cylinders 37, 38, 39, 40 are floatingly mounted between the disc 30 and the crosswise intersecting arms 31 of the carrier frame, so that they are vertically displaceable over a range between a pair of stops, the displacement of each cylinder being sensed by an associated detector 48, each cylinder being optionally connected to resilient means, for instance a spring 49 acting to counterbalance the weight of the cylinder. When one of the telescopically joined pistons with the respective suction cup descends to lower the product carried thereby by the suction effect, the touch-down of the product on the bottom of a receptacle or on a layer of the products previously formed therein results in an upward displacement of the body of the respective cylinder, in response to which the associated detector generates a signal for causing the descent to be terminated and the vacuum application to be interrupted, as a result of which the suction cup releases the product and is raised to the position shown in fig. 9. When on the other hand the movable member of the telescopically joined piston with its suction cup is lowered onto a product disposed in one of the concave supports, the body of the cylinder is again and in the same manner displaced upwards, in response to which the associated detector in cooperation with the program control unit causes the product to be picked up by the suction cup and to be raised by the retraction of the movable member of the telescopically joined piston, whereupon the carrier frame is rotated by the predetermined angle and the product is then lowered onto the bottom of the receptacle or onto a layer of the products previously formed therein as has been described. The receptacle conveying means 50 (figs. 1, 2, 3, 11 and 12) comprise a carriage 51 mounted on guide rails 52 for its displacement transversely of the longitudinal axis of the machine, this axis being considered as the direction of displacement of the empty receptacles to be filled from the entry section of the machine, and of the filled receptacles to the exit section as indicated by the arrow G in fig. 3. The transverse displacement is an alternating movement, that is, from left to right and vice versa in the top plan view of fig. 3, and is brought about for example by a threaded spindle 53 adapted to be rotated in opposite directions by a motor 54 and cooperating with a travelling nut connected to the carriage. The described mechanism for alternating transverse displacements may of course be replaced by any other convenient construction. The carriage 51 has a rigid frame provided with two longitudinal chains running on respective sprockets mounted on two transverse shafts 55 and 56 at the ends of the carriage, and carrying a plurality of cross bars 57 secured thereto for supporting the receptacles, in the present example two receptacles to be filled at the same time, as they are conveyed from the entry section to the exit section of the machine, and a number of stops 58 for retaining the receptacles as they are conveyed in the direction indicated by the arrow G in fig. 3. As illustrated in figs. 3 and 11, the crossbars and stops extend over the space between the two endless chains and are in the present example dimensioned for supporting two receptacles to be filled at the same time. When the machine is designed for filling more than two receptacles at a time, the width of the receptacle conveying means has to be increased correspondingly. The actuation, in the present case intermittent and step by step, of the means for conveying the receptacles to be filled is accomplished by a suitable motor 59 via a chain-and-sprocket transmission or a belt-and-pulley transmission. The carriage 51 has an upper frame portion 60 (figs. 2, 13, 14 and 15) extending parallel to the carriage at a certain height thereabove and fixedly joined thereto by for instance four vertical columns 61 (figs. 2 and 14). The upper frame portion 60 carries a pair of cross barrier means for maintaining the products in position during the formation of the rows of products for each layer in the pair of juxtaposed receptacles being filled at a time in this embodiment of the filling machine, that is, the number of cross barrier means corresponds to that of the receptacles to be filled simultaneously. The upper frame portion also carries a pair of retainer means operable to retain each row of products after it has been completed in each of the two juxtaposed receptacles, that is, the number of retainer means again has to correspond to that of the receptacles to be simultaneously filled by the described machine. The two cross barrier means are mounted in frame portion 60 and comprise each a brush 62 suitably secured to a likewise transversely extending rail member 63 mounted for vertical up and down displacement between an inactive upper end position and an operative position at the level of the bottom of the receptacle or of the layer of products to be composed. The rail member 63 is hingedly connected to two arms of an articulated linkage 64 (fig. 14), the lower end of one of the two arms being hinged to the rail member 63 at a fixed point 65, while the lower end of the other arm is connected to a pin 66 guided for horizontal displacement in a longitudinal slot 67 of the rail member. The upper end of the arm connected to the pin 66 is hinged to the frame portion 60 at a fixed point, while the upper end of the other arm, the one having its lower end hinged at the fixed point 65, is connected to a pin guided for horizontal displacement in a slot 68 formed in a transverse wall member 69 of the frame portion 60 (figs. 14 and 15). The raising and lowering of each brush 62 is effected by means of a pneumatic cylinder 70, which may of course also be replaced by a hydraulic cylinder or any other conventional actuator, and has the free end of its piston rod hinged to the upper end opposite the fixed point 65 of the corresponding arm of the linkage 64, the displacement of said piston rod being controlled by a control device 71 cooperating with a tooth rack 72, there being additionally provided a series of transversely directed windows for detecting the position of the free end of the piston rod of the cylinder 70, and thus at the same time the elevational position of brush 62. The described displacement control and the step of monitoring the elevational position of the brush may of course also be accomplished by any other suitable means. Each of the retainer means, in the present case two such means as explained above, comprises a crossbar 73, which is preferably resilient or provided with an elastic lining so as to avoid damage of the products as a completed row thereof is retained with a certain pressure in each of the two juxtaposed receptacles to be filled at the same time. The crossbars are mounted in a substantially similar manner as described above with reference to the cross barrier means, with the brush 62 being simply replaced by the crossbar 73, and with the following differences with regard to the mounting of the two cross barrier means: the means for the retention of each completed row of products in each one of the two juxtaposed receptacles include means for its alternating longitudinal displacement relative to frame portion 60, and thus relative to carriage 51, to which purpose the two retainer means are operatively interconnected and mounted in a manner permitting them to be longitudinally displaced relative to the frame portion 60 thanks to the provision of guide means 74; this alternating longitudinal displacement is coordinated, as far as the movement in the direction towards the exit of the receptacles is concerned, with the intermittent advance displacement of the receptacles as they are being filled, this displacement taking place in steps of a length equal to the distance between the axis of an already completed row of products and that of the next row to be composed. To this purpose, and for coordinating this displacement towards the exit of the machine, the carriage 51 contains an intermediate transverse shaft 75 suitably mounted between the longitudinal side members of the carriage and operatively connected to one of the two endless chains of the carriage by a sprocket in engagement therewith. Mounted on the lefthand end portion of shaft 75 is a sprocket 76 and a clutch 77 disposed between the sprocket and the remainder of the shaft (figs. 3 and 11), a suitable chain being provided for operatively connecting the sprocket 76 to two other sprockets 78 and 79 (figs. 13, 14 and 15) rotatably mounted in the frame portion 60 in such a manner that they define a horizontally extending run of the chain to which one of the two interconnected retainer means is connected to result in synchronized displacement of the pair of retainer means and the receptacle conveying means in the direction of the arrow G in figs. 3 and 11, to which purpose the sprockets 76, 78 and 79 are of the same effective diameter. The interconnection of the two retainer means and the connection of one of them to the horizontal run of the chain between the sprockets 78 and 79 have not been illustrated in the drawings. The crossbars 73 of the two means for retaining each completed row of products in each of the two juxtaposed receptacles are displaceable between an inoperative upper end position (not shown in fig. 13) adjacent the associated cross barrier means, and an operative position above the front face of the row of products previously formed with the aid of the respective brushes 62, whereupon the pair of receptacles being filled is advanced towards the exit section of the machine (to the right in fig. 13) by a length equal to the distance between the axis of the previously formed row of products and that of the next row to be composed in each of the two receptacles, the pair of retainer means being displaced in synchronism with the receptacles while exerting a certain pressure on the previously completed row of products to retain the latter without damaging them, until the receptacles have been advanced by the above defined distance, at which time the two crossbars may if so desired be raised again while the next row of products is formed between the previously completed row and the associated cross barrier brush, although it may be considered convenient to maintain the retention of the completed row while the next one is being composed, in which case the crossbars 73 of the retainer means are kept in their operative position until the next row has been completed, at which time they are raised, displaced longitudinally and then lowered again for retaining the just completed last row of products, whereupon the described cycle is repeated. The various operative phases,including the formation of different distributions-in-space of the products in the receptacles which may be selected by the user in accordance with the capacity of the latter, are controlled and monitored by a program control unit 80 which permits the user to select a suitable distribution of the products in each layer in accordance with the length and width of the receptacles, and the arrangement of stacked layers relative to one another in accordance with the height of the receptacle. The machine also includes a switchbox 81 containing electric control and monitoring circuit components. The machine may also be combined with a conveyor 82 for empty receptacles disposed upstream of the entry section of the machine, and with another conveyor 83, for instance of the gravity type, disposed downstream of the exit section of the machine for the discharge of the pairs of filled receptacles. In any case, the machine may be coupled to existing installations at the location whereat the products with which the receptacles are to be filled are handled, in accordance with the necessities and interdependencies of the corresponding installations. The embodiment of a machine for filling receptacles in accordance with a predetermined pattern as described above by way of example operates as follows: The user beforehand selects, by means of the program control unit, a desired distribution-in-space of the products in the receptacles to be filled therewith, that is, the number of layers of the products, the pattern of each layer, and the arrangement of the layers relative to one another, in accordance with the size of the products and the dimensions of the receptacles to be simultaneously filled by the machine. After the machine has then be started, and a pair of receptacles has been delivered from in the present case the conveyor 82 onto the receptacle conveying means 50 at the filling station of the machine, the product feeding operation is started to feed the products to the simultaneously operating feeding means, the two endless belts 2 and 3 conveying the products to the oscillating troughs 6 and 7, from where they proceed to the narrow oscillating channel sections 13 and 14. The two simultaneously operating feeding means are then stopped when the detector means disposed at the transfer locations between the endless belts 2 and 3 and the oscillating troughs 6 and 7 generate respective signals indicative of the channel sections 13 and 14 being filled with the products. In the oscillating channel sections 13 and 14 the products arrange themselves in single file, and are then discharged one by one onto the respective concave support by the operation of the rod-shaped stop 18, products of a more or less flattened shape being oriented in the manner disclosed in the above description so as to rest on the concave supports with their flattened bottom face. The carrier frame which constitutes the transfer means for the transfer of the products from the concave supports to the receptacles to be filled or being filled is then controlled to activate the two cylinders 37 and 39 for lowering the respective suction cups 41 and 43 onto and into contact with each of the products disposed on the pair of concave supports 21 and 22, the products being retained by the suction cups by the effect of the vacuum applied thereto by way of the telescopic pistons, and immediately lifted off the concave supports, whereupon the carrier frame rotates counterclockwise by an angle of 90°, followed by the descent of the telescopic pistons to thereby deposit the products carried by the suction cups as the first units of the first row in each of the two receptacles to be filled simultaneously, to which purpose the carriage 51 of the receptacle conveying means 50 is in the position depicted in fig. 3, the receptacle conveying means having positioned the two receptacles in such a manner that the operating of filling them starts in the righthand rear corner in this position assumed by way of example. While the first pair of products is being deposited in the two receptacles in the described manner, the other two suction cups 42 and 44, which have been aligned above the concave supports by the counter-clockwise rotation of the carrier frame, are lowered by the actuation of their vertical cylinders 38 and 40, respectively, onto another pair of products meanwhile discharged onto the two concave supports. As soon as the suction cups 41 and 43 have released the first two products after having transferred them in the described manner to the two receptacles to be filled, the pistons of the cylinders 38 and 40 are retracted to their upper end position, and the carrier frame rotates clockwise about an angle of 90°, whereupon the two telescopic pistons carrying the suction cups 42 and 44 are lowered to deposit the second pair of products in the two receptacles to be filled, arranging them as the second units of the first row of the products being formed with the aid of the respective cross barrier means or brush. The described steps are then alternatingly repeated, it being to be noted that the rotation of the carrier frame is preferably alternating between opposite directions, that is, one step in one directon and the next in the opposite direction, to permit the electric and pneumatic connections to be simplified. It is also possible, however, that the carrier frame rotates step by step in the same direction, in which case the electric connections would have to be established by the use of contact means such as brushes or of electromagnetic induction means, and the pneumatic connections would have to include rotatable couplings for maintaining the required fluid flow at the proper pressure without interferring with the one-directional rotation of the carrier frame. Each time after a product unit has been deposited in each receptacle, the carriage 51 is transversely displaced by a length equal to the distance between the axes of the longitudinal columns of products to be formed, this displacement being controlled by the step motor 54 in cooperation with the threaded spindle 53. After the first row of products has been completed in each of the two receptacles, the associated retainer means are lowered into retaining pressure contact with the products of this row, without damaging the products therein, and the receptacle conveying means 50 with the two receptacles thereon is longitudinally advanced towards the exit section of the machine by a step corresponding to the distance between the completed row of products and that of the next row to be formed, the retainer means with their crossbars 73 being synchroneously displaced by the same distance so as to retain the first row in its proper position; this cycle is then repeated for the second row, which after having been completed is again retained by the crossbars of the retainer means, to which purpose the latter are raised off the first row and lowered onto the second row in the manner described, and so on until the first layer of the products has been completed in each of the two receptacles. For the displacement of the pair of receptacles in the direction of the transverse axis of the machine in successive steps of a length corresponding to the distance between the axes of the longitudinal columns to be formed by the units of the rows being composed, the carriage is displaced by similar steps from its lefthand end position with respect to the pair of receptacles being filled to its righthand end position, over a total distance approximately corresponding to the width of the two receptacles being filled, this displacement being brought about by the rotation in the proper direction of the threaded spindle 53 driven by the motor 54, it being finally to be noted that the composition of one row of the products proceeds in a first transverse direction, and the composition of the next row in the opposite direction, so that dead-run displacements of the carriage are avoided. After one layer of the products has been thus completed, the formation of a second layer may be initiated in accordance with a pattern different from that of the first layer so as to ensure a stable arrangement of the products forming the second layer relative to the first layer, in a predetermined configuration-in-space to be selected by the user of the machine with the aid of the program control unit. After the two receptacles have been thus filled, the receptacle conveyor means 50 acts to convey them to the exit section of the machine, where they are discharged, in the present example onto the gravity conveyor 83, whereupon the full cycle described above is repeated for filling another pair of receptacles, the successive full cycles being basically controlled and monitored by the program control unit with the aid of the various detectors and motors with their associated transmission means which have been described in detail in the course of the present description. The formation of the second layer and successive stacked layers in each case proceeds after the cross barrier means and retainer means have been raised to the convenient height.

Claims: A machine for filling receptacles with products in accordance with a predetermined pattern, of the type comprising means for feeding the products to be packed, means for the suction-supported transfer of the products from the product feeding zone to the corresponding receptacle and for depositing them therein in accordance with a selected and predetermined distribution-in-space, and means for conveying the receptacles to be filled from an entry section to an exit section for the filled receptacles, and further comprising a frame structure for supporting the components of the machine, means for actuating the various components, and control, activating and monitoring means, characterized in that the machine includes at least two simultaneously operable product feeding means (2,6;3,7) terminating in associated oscillating conveyor channels (13,14) effective to arrange the products in single file and to discharge them one by one onto a concave support (21,22) having a bottom formed by a vibratory brush (23,24), in that said product transfer means comprises at least one carrier frame (29,30,31) mounted for rotation about a vertical axis by increments of an angle equal to the result of dividing 360° by twice the total number of concave supports (21,22), and then multiplying with the number of rotatable carrier frames (29,30,31), said vertical axis being located equidistant from the centers of the associated concave supports (21,22), said carrier frame (29,30,31) carrying a number of vertically extending pneumatic cylinders (37,38,39,40) mounted at equal circumferential spacings corresponding to one increment of the rotation of said carrier frame (29,30,31), and connected to respective solenoid valves communicating with a compressed-air source, the pistons of said cylinders (37,38,39,40) being tubular and in communication at their upper ends with respective vacuum sources themselves communicating with associated solenoid valves connected to said compressed-air source, said pistons being provided at their open lower ends with preferably bellows-shaped suction cups (41,42,43,44), in that said receptacle conveying means (50) comprises means for longitudinally advancing said receptacles towards said exit section of the machine, mounted on a carriage (51) provided with means (53,54) for the alternating transverse displacement of said receptacles and at least a pair of cross barrier means (62,63,64) associated to said receptacles to be filled for maintaining the products in position during the formation of the rows of products of each layer in at least one pair of juxtaposed receptacles to be filled simultaneously, said carriage (51) being further provided with at least one pair of retainer means (73) for the retention from above of each row of products having been formed in each one of said pair of juxtaposed receptacles, said retainer means (73) being provided with means for their alternating longitudinal displacement, the displacement in the direction towards the exit of the receptacles being coordinated with the intermittent advance displacement of the receptacles being filled by increments of a length equal to the distance between the axis of one row of products and that of the next row to be formed, and an inoperative return displacement over an equal distance for the retention of the subsequent row after its completion, and in that the machine further includes a program control unit (80) operable to control and monitor the various operative phases including selectively variable distributions-in-space of the products in the receptacles in accordance with the capacity of the latter.

Inventors: GUARDIOLA, AGUSTIN DAUDER
Applicants: TALLERES DAUMAR S.A.
Application year: 1990
Main classification: B65B25
IPC codes: B65B5, B65B25, B65B35