FR2597400A1 - DEVICE FOR MOUNTING CARDBOARD TRAYS - Google Patents

Abstract

1. An appliance to fold trays, characterized in that it consists firstly of a die (20) comprising several series of formation ramps (29, 30, 32) bounding a horizontal opening, vertically displaced from one another and located longitudinally and transversely relatively to the blank (2) from which the tray is produced, and arranged in the position of the groove lines exhibited by the blank, and secondly of a punch (22) comprising two parallel heels (36) located symmetrically in relation to a transverse median plane of the blank, this punch being associated with means enabling it to be displaced vertically, and the heels (36) being displaceable relatively to one another between a separated position and the external edges of the heels are situated at a distance from one another corresponding to the internal length of the tray and an approaching position in which the external edges of the heels are situated at a distance from one another less than the internal length of the tray, the means of operating the punch being so arranged that when the blank is fed in the punch is located above the ramps (29, 30, 32) and then after the blank has been positioned the punch is displaceable vertically downwards, the heels (36) being in the separated position, so as to move the blank in contact with the ramps that ensure its folding, then to maintain the punch in this position for the time required for the glue to set, and finally to draw the heels together and to displace the punch upwards.

Description

DEVICE FOR MOUNTING CARDBOARD TRAYS

  The present invention relates to a device for mounting

  cardboard trays, and more particularly trays comprising a bottom delimited by two longitudinal walls and two walls transver5 dirty, the transverse walls each having two longitudinal returns to achieve their assembly to the longitudinal walls.

  This device is also capable of assembling trays

  which, alternatively, comprise a return parallel to the bottom, called "sidewalk", itself having two side edges, folded and fixed against the longitudinal returns.

  Generally, after depositing glue on the parts to be assembled, the shaping of a plate is carried out by a punch-shaped tool ensuring the folding of the side walls along crease lines previously formed on one of the faces of the plate. cardboard blank. At the end of the bending, the punching tool must hold the glued portions in pressure against each other until the glue is completely set.

  to ensure a final assembly.

  Although hot-melt adhesives are nowadays used, obtaining a correct assembly which is not liable to break during subsequent handling of the tray is not instantaneous and prolongs the process. formatting operation of one or two seconds, which results in a limitation of the rates

machine production.

  To overcome these disadvantages, it has been imagined to use a carousel, equipped with several cardboard shaping devices.

  or trays, each blank brought to the machine, being supported by a shaping device which, during the rotation by step of the carousel, successively ensures the shaping of a package and the maintenance in pressure of the glued parts of this, during the drying of the glue, while other blanks are already supported by the following shaping devices.

  This arrangement allows, during each revolution of the carousel,

  a partial superimposition, over time, folding and pressure maintenance operations performed on blanks introduced successively into the machine.

  It is thus possible to avoid the harmful influence of the setting time

  glue on the rate of the machine.

  The present invention aims at providing a simple device for placing

  shaped trays can advantageously equip a carousel.

  For this purpose, this shaping device comprises, on the one hand, a matrix comprising several series of shaping ramps 5 delimiting a horizontal opening, vertically offset and arranged longitudinally and transversely to the blank from which the plate is made, and located at the level of the creasing lines that the blank comprises and, secondly, a punch comprising two parallel heels arranged symmetrically with respect to a transverse median plane of the blank, this punch being associated with means ensuring its vertical displacement, and the heels being movable towards each other between a spaced apart position in which the outer edges of the beads are located at a distance from each other corresponding to the inner length of the plate and a close position in which the outer edges heels are located at a distance from one another less than the inner length of the tray, the means the punch is arranged so that, when the blank is fed, the punch is located above the ramps and then, after positioning the latter, it is moved vertically downwards, the heels being in the spaced apart position, so as to move the blank in contact with the ramps which ensure the shaping, then

  maintaining the punch in this position for the duration of setting of the glue and, finally, to achieve the approximation of the heels and the movement of the punch upwards.

  The descent phase of the punch corresponds to the shaping of the tray, while the drying is carried out in a position where the glued walls of the tray are held pinched between the

ramps and the punch.

  Inasmuch as several of these devices equip a carousel, their relative movement with respect to the central column of the carousel 30 may advantageously be used to control the various

  movements of the punch and the organs that are possibly associated with it.

  Anyway, the invention will be well understood using the

  description which follows, with reference to the attached schematic drawing showing, by way of non-limiting examples, an embodiment of a plate 35 and an embodiment of a machine for mounting it

  Figure 1 is a perspective view of the tray Figure 2 is a plan view of the blank from which the tray of Figure I is made; Figure 3 is a perspective view of this machine Figure 4 is a top view Figure 5 is a partial sectional view along the line V-V of Figure 4; Figures 6 and 7 are two schematic views, respectively, of front and side of a shaping device of a carton; Figures 8 to 13 are six front views during six phases of

the shaping of the tray.

  The plate, shown in FIGS. 1 and 2, obtained from a

  blank 2 comprises a bottom 3, separated by longitudinal 4 and transverse crease lines 5, of respectively longitudinal 6 and transverse walls 7.

  The two transverse walls 7 are provided with two longitudinal returns 8 intended to be fixed against the longitudinal walls 6.

  In addition, each transverse wall 7 has a transverse return 9 from which it is separated by a creasing line 10, each return 9 being equipped at its two ends with two tabs 12 from which it is separated by creasing lines 13 .

  In practice, and as shown in FIG. 1, in the mounted position

  of the tray, the returns 9 extend parallel to the bottom of the tray in the direction of the inside thereof, the holding in place of each return 9, also called "sidewalk", being provided by gluing the tabs 12 against the longitudinal returns 8.

  It emerges from the structure of this tray, that its automatic assembly is difficult to achieve, and that its assembly requires a maintenance

  in pressure in many points previously glued.

  This assembly can be carried out with the aid of the machine represented as a whole in FIGS. 3 to 5. This machine is of the carousel type comprising a central column 14 on which are pivotally mounted four platen shaping stations 15 arranged to 90 from each other. These four stations are rotated in steps around the column, through a motor not shown, the output shaft carries a pinion 16 meshing with a ring gear 17 which is secured to a sleeve 18 which surrounds the column and which is guided in rotation on it. On the sleeve 18 are fixed four frames 19,

  belonging to the four shaping devices.

  Each frame 19 carries a matrix 20 mounted in a fixed manner, and

  a punching device 22, which will be described in more detail below, movable vertically between a position in which it is located above the horizontal plane for feeding the blanks and a position in which it is engaged in the die, which is itself disposed below the blank feed plane.

  The cardboard blanks 2, previously slotted and cut, are stored in a magazine 23, with gripping of the lower blank by a device 24, for example by suction cups, depositing this blank on lug chains 26, bringing the blanks together after passing to a gluing station 27 at station A of the carousel, where the blank is taken

  load by a shaping device.

  Each blank is positioned at this level by support it comes to take against a stop 28 secured to the frame 19.

  The matrix 20 comprises three series of ramps 29, 30 and 32, offset vertically relative to each other and arranged at crease lines that the blank, to allow the folding of the walls at said crease lines. Thus, the series of ramps 29 folds the returns 8 to 90 relative to the transverse walls 7, the ramps 30 ensure that the transverse walls 7 are bent at 90 with respect to the bottom 3, and the ramps 32 provide

  the folding of the longitudinal walls 6 with respect to the bottom 3.

  These different bends are obtained during the lowering of the blank 25 under the effect of the pressure exerted by the punching device. This device comprises a support 33 on which are mounted two arms 34 arranged symmetrically to a diametral plane of the carousel, articulated about two parallel horizontal axes 35.

  Each of these arms is equipped at its lower end with a heel 36, the two beads 36 being parallel and their length being at most equal to the internal width of the plate to be obtained.

  As shown in the drawing, the arms 34 carrying the two beads are connected, substantially at mid-height, by two links 37, articulated one on the other about a horizontal axis 38 and each of which is articulated on one arm 34 about a horizontal axis 39. A lifting movement of the hinge 38 with respect to the position shown in FIG. 6 results in a displacement of the two heels in one direction.

reconciliation of these.

  The shaping device also comprises two rollers of axes parallel to the two beads 36 and situated at a distance from the bottom of the plate, in a period formed thereof, equal to the height of the lateral walls. These two rollers are arranged symmetrically on the

  else of a diametral plane of the carousel and are carried by two links 42, articulated each around a horizontal axis 43 on the frame 19. These two links are connected at their upper ends by a spacer 44, articulated around horizontal axes 45.

  In practice, the support 33 is pivotally mounted at the end of an arm 46, whose central portion is hinged about a horizontal axis 47 on the frame 19, and whose other end is engaged in

  a lower peripheral groove 48 formed in the column 14.

  In addition, the hinge pin 38 of the two links 37 connecting 15 between the arms 34 is mounted at the end of an arm 49 located in a

  diametral plane of the carousel, articulated at 50 about a horizontal axis on the frame 19 and whose other end is engaged in an intermediate peripheral groove 52 formed in the column 14.

  Finally, the spacer 44, connecting the rods 42, is integral with one end of an arm 53 occupying a position diametrical with respect to the carousel, articulated in its central portion 54 on the frame 19, and the other end is engaged in a superior peripheral groove

in column 14.

  The shaping device is also equipped with flaps 56 intended to fold down the lugs 12, pivotally mounted on the support 33, and actuated by pneumatic cylinders 57, when the assembly of the shaping device occupies a predetermined angular position.

compared to column 14.

  In operation, a tray shaping device 30 located at the station A for feeding the blanks, a blank 2 is introduced between the die and the punch until it comes into abutment against the stop 28. During the rotational drive in the form of the grooves 48, 52 and 55, the moving part is firstly lowered when the punching device is lowered, which, as a first step and as shown in FIG. 90 tilting of the returns 8 in contact with the ramps 29 and, as shown in Figure 9, the tilting 90 of the returns 7 in contact with the ramps 30, and finally the tilting of the longitudinal walls

  6, as shown in FIG. 10, in contact with the ramps 32.

  Arrived in this position, the vertical movement of movement towards the bottom of the support 33 is stopped, after which the arm 53 acting on the connecting rods 42 brings the rollers 40 closer together and the tilt 5 of the rollers 9 horizontally, in contact with each other. heels 36 (Figure 11). This operation is followed, at the passage of the device to a determined angular position, by the tilting of the flaps 56 which come to press the tabs 12 against the returns 8. The various component parts of the device remain in the latter position, until the arrival from the device to station B, shifted three quarters of a turn from the station

  A, at which the evacuation of the trays is carried out.

  At this position, the two heels 36 are brought closer to each other under the effect of a pivoting of the arm 49, as shown in Figure 13, and the plate is cleared down with the help of a vacuum device 58 which brings it into contact with an evacuation conveyor 59. During the idling rotation of the device between the station B and the station A, the arms 46, 49 and 53 swing to cause the spacing heels 36, the spacing of the rollers 40 and the rise of the support 33 before starting a new cycle. As can be seen from the foregoing, the invention brings a great improvement to the existing technique by providing a simple design device, with a variable geometry punch, which makes it possible to assemble trays of complex shapes, and which can advantageously equip a a carousel machine by taking advantage of the rotational movement around the central column of the carousel to control the different movements required and to ensure that the glued parts are kept in contact for a sufficient length of time to guarantee a perfect geometry of the carousel. packaging, and performance

  mechanical and storage of it.

  It goes without saying that the invention is not limited to the sole embodiment of this device, described above as an example; it embraces, on the contrary, all variants. This is the way that this device could be used for shaping packaging such as trays or trays without parallel returns to the

background.

Claims (8)

  1. - Tray conformation device, characterized in that it comprises, on the one hand, a matrix (20) having several series of shaping ramps (29, 30, 32) defining a horizontal aperture, offset vertically and arranged longitudinally and transversely to the blank (2) from which the plate is formed, and situated at the level of the creasing lines that the blank comprises and, secondly, a punch (22) comprising two parallel heels (36). arranged symmetrically with respect to a transverse median plane of the blank, this punch being associated with means ensuring its vertical displacement, and the heels (36) being movable towards each other between a spaced apart position in which the outer edges of the heels are located at a distance from each other corresponding to the inner length of the tray and a close position in which the outer edges of the heels are located at a distance from one another. other than the inner length of the tray, the punch control means being arranged such that, when the blank is fed, the punch is located above the ramps (29, 30, 32) and then after positioning it, it is moved vertically downward, the heels (36) being in the spaced position, so as to move the blank in contact with the ramps which ensure the shaping,   then to maintain the punch in this position during the duration of setting of the glue and, finally, to achieve the approximation of the heels and the movement of the punch upwards.   2. - Device according to claim 1, characterized in that each heel (36) is mounted at the lower end of an arm (34) hinged about a horizontal axis (35) on a support (33), itself movable vertically, the two arms (34) being connected to each other by a pair of links (37), each of which is articulated on the one hand, on the other link and, on the other hand, on one of the arms about a horizontal axis (39) located between a bead and the hinge axis (35) of this arm on the support (33), means being provided which provide a movement vertical axis of articulation (38) of the two rods relative to one another to the support (33).   3. - Device according to claim 2, characterized in that, insofar as the plate to be mounted comprises two returns (9) extending parallel to the bottom of the side of the inside of the plate, it comprises two rollers (40) axes parallel to the two returns, located at a distance from the bottom of the plate equal to the height of the plate, mounted at the end of two links (42) articulated at mid-length around horizontal axes on the frame (19) , and whose upper ends are connected by a spacer (44) associated with vertical displacement means relative to the support (33), allowing the rollers (40) to move between a   spaced apart position in which the spacing of the rollers (40) is greater than the length of the tray and a close position in which the distance between the rollers (40) is less than the length of the tray.   4. - Device according to claim 3, characterized in that it comprises means causing the tilting of the lateral overhangs (12) of the horizontal returns (9) of the plate, constituted by flaps (56) articulated on the support (33). ), and actuated by pneumatic cylinders (57).   5. - Device according to claim 2, characterized in that, insofar as it is mounted on a carousel, the means for vertical displacement of the support (33) are constituted by an arm (46) occupying a diametral position relative to the carousel, articulated about an axis (47) integral with the frame (19) pivotally mounted around the column (14) of the carousel, and whose other end is engaged in a groove (48) 20 opening on the periphery of said column.   6. - Device according to claim 3, characterized in that, in the case where it is associated with a carousel, the axis of articulation (38) between the two rods (37) connecting the two arms (34) carrying the heels (36), is mounted at one end of an arm (49) disposed in a diametral plane 25 of the carousel, articulated around a horizontal axis (50) on the frame (19) rotated around the central column (14) of the carousel, and the other end is engaged in a groove (52) opening   at the periphery of said column.   7. - Device according to claim 4, characterized in that, inasmuch as it is associated with a carousel, the means for vertical displacement of the spacer (44) connecting the two links (42) carrying the rollers (40). ), are constituted by an arm whose one end is integral with the spacer (44), hinged (54) on the frame (19) rotates around the fixed central column of the carousel, and whose other end 35 is engaged in a groove (55) opening at the periphery of the column (14).   8. - Device according to any one of claims 1 to 7,   characterized in that it comprises means for extracting the trays by the lower end of the series of ramps (29, 30, 32), acting at a fixed station (B) equipped with evacuation means (59) trays finished after approximation of the heels (36).