CH632701A5 - PARTS FEEDING SYSTEM FOR A BLOW MOLDING MACHINE FOR CONTAINERS. - Google Patents

Description

The present invention relates to an installation for supplying parts for containers produced by blow molding, such as bottle-shaped containers and, more specifically, an installation for supplying cylindrical plastic parts (each comprising a molded bottom using an injection molding machine), one by one to the assembly intended to remove the heat and blow the mold from an oriented blow molding machine.

We manufacture a transparent, thin-walled, blow-molded plastic container with displacement along two axes by heating a cylindrical part with a base and a previously machined neck, then by moving the part along two axes, lateral and longitudinal, in a mold. blowing. Since a number of the aforementioned parts are, however, simultaneously molded using an injection molding machine and are then brought as they are in various orientations, at random it is not easy to feed these parts one by one to an assembly which corresponds to the molding speed of an orientation blow molding machine. Consequently, the parts must therefore be manually fed to the support in order to put the automation of a container production line out of service.

The present invention aims to provide an installation for aligning and feeding the parts simultaneously molded in an injection molding machine, then accumulated and brought, in various orientations, randomly, one by one, to the next phase , to take into account the molding speed of an orientation blow molding installation for the manufacture of bottle-shaped containers. The installation according to the invention is defined in claim 1.

One embodiment of the invention consists in providing a parts supply unit adapted to the device for bringing the parts into the hanging position and in presenting the parts coming out as is, aligned with the neck at the top, so to be easily brought in and maintained.

Another embodiment consists in providing an installation for feeding the pieces attracted and maintained by means of negative pressure, with a mechanism for reversing the pieces turning them upside down, the neck down, so that they are easily inserted into the holder.

Another embodiment consists of an installation for feeding the inverted pieces, the neck down, using a piece insertion mechanism to clamp the pieces with retaining latches, and to release the flanges. parts in a position allowing the parts to be inserted into the support to drop them towards this support so that it can insert and engage the related parts.

The characteristics of the invention will be highlighted and easier to understand in the light of a reading of the following description, based on the accompanying drawings.

Fig. 1 is a schematic side view which shows the arrangement of the various elements of a blow molding line corresponding to the preferred design of the present invention;

fig. 2 shows side views of bottle-shaped containers which show the evolution from the part in different positions to the finished product, according to the present invention;

fig. 3 is a sectional side view of the part alignment device used in the blow molding line, according to the present invention;

fig. 4 is a plan view of the parts alignment system corresponding to a section along the line IV-IV shown by arrows in FIG. 3;

fig. 5 is a partially enlarged section of the vibrating table used in the workpiece alignment system shown in FIG. 3;

fig. 6 is a side view in section similar to that of FIG. 3, but by revealing ime another preferred design of the parts alignment device, according to the present invention;

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fig. 7 is a side view enlarged longitudinally, partially showing in section the inversion and insertion mechanisms which are the subject of the present invention;

fig. 8 is a side view of the coin reversing mechanism; fig. 9 is a plan view which shows only the control of the inversion and insertion mechanisms shown in FIG. 7;

fig. 10 is a plan view of the mechanisms for inverting and inserting the parts corresponding to a section along the line X-X in the direction designated by the arrows in FIG. 7, and fig. 11 is a plan view showing the relationship which exists between the path of movement of the parts and the supply route of the assembly, in the device for supplying the parts for the blow molding of the containers, according to the present invention.

Referring now to the drawings, and in particular to FIG. 1 which is a schematic side view of the blow molding line of the bottle-shaped containers according to the present invention, in which identical reference numbers designate the same parts in the following figures, the blow molding chain of the containers comprises an injection molding machine 10, with a block 11 intended for automatically removing the parts molded simultaneously by the machine 10 from the mold of said machine 10. The grids of the parts thus removed by the block 11 are cut by a cutting block 12 installed next to the injection molding machine 10, and they are then evacuated on the first horizontal conveyor 13. The parts are then transported on an oblique conveyor 14 which leaves from the end of the first horizontal conveyor 13, and they are cooled to the ambient temperature or at a lower temperature fixed at a predetermined value by the cooling air blown by a blower 15, t out along their route on the oblique conveyor 14. The pieces are then transferred from the top of the oblique conveyor 14 to the second horizontal conveyor 16, then they are conveyed in the direction of their movement, via a third conveyor horizontal 17 towards the device 20 for feeding the parts intended for blow molding of the containers in the form of bottles, a device which is designated as a whole by 20, in the present invention. This device 20 comprises a workpiece alignment block 18, a rope conveyor 19, a workpiece reversing mechanism 21, a workpiece insertion mechanism 22 and a mechanism for feeding the assembly 23. A number of parts molded periodically and systematically by the injection molding machine 10 are conveyed as is, accumulated in various orientations at random, then they are discharged one by one by the parts alignment block 18 to take account of the speed of molding of an orientation blow molding machine at the next stage. The part evacuated from the alignment block 18 is suspended from the cord conveyor 19, the previously finished neck being directed upwards, and it is then conveyed to the mechanisms 21 and 22 for inversion and insertion by means of 'a slide. The part thus routed is inserted and engaged in a support 27 (fig. 2) supplied by the mechanism 23. The part thus inserted into the support 27 is uniformly heated while moving in the heating and blowing part of a machine 24 of orientation blow molding, and it is blow molded along two axes to obtain a bottle-shaped container. The container thus obtained is then removed from the support 27 by a relevant block 25 and it is brought to the control and packaging blocks of bottle-shaped containers (not shown), via a fourth horizontal conveyor 26 .

Reference is now made to FIG. 2, which represents the transformation of the piece in various attitudes into a finished product, a container in the form of a bottle. The part 30 is a cylindrical shape with relatively thick walls, with a bottom, and it is molded simultaneously by the mold of the injection molding machine 10 and has a neck 32 and a collar 33, so as to form a neck part previously finished 31 with the neck-shaped end 32 and the collar 33.

The part 30 conveyed by the conveyor is directed flat as it rests on the conveyor, as shown in FIG. 2 (A). The part 30 coming out of the parts alignment block 18 is straightened at the flange 33 by the play of the two cords of the cord conveyor 19 in vertical position, neck up, as shown in fig. 2 (B). The part 30 thus positioned, neck up, is brought towards the coin reversing mechanism 21 and it is thus inverted in the neck down position by the reversing mechanism 21. The part 30 thus reversed in the neck position towards the bottom is inserted and engaged in the support 27 by the parts insertion mechanism 22, as shown in fig. 2 (C).

The support 27 comprises a cylindrical mandrel 28, a circular disc 29 to be engaged in the fixing of the feeding mechanism 23, a neck support 34 and an axis with an orientation core 35 extending the mandrel 28 vertically upwards. The part 30 blow molded along two axes by the orientation blow molding machine 24 in the form of a bottle-shaped container 36 swells at the level of the body and the bottom, as shown in FIG. 2 (D).

The device 20 for feeding the parts for the blow molding of a bottle-shaped container, which is the subject of the present invention, will now be described by giving the details of its various components.

Figs. 3 to 5 show the parts alignment block 18 used for the device 20 of the present invention. The alignment block 18 comprises a hopper 37 intended to receive the pieces conveyed in different orientations, at random, as open at the end of the third horizontal conveyor 17. A control cylinder 38, rotating intermittently, is mounted laterally at the bottom of the hopper 37. A plate or a table for aligning the parts 40 is arranged under the control cylinder 38 with a vibration generator 41 fixed under the table 40. The control cylinder 38 has several small housings 39 to leave drop the parts 30 which have entered each of the small housings 39, passing from the hopper 37 to the alignment table 40, due to the rotation of the control cylinder 38.

A space is provided between the lower edge of one of the side walls 37a which faces the third horizontal conveyor 17 of the hopper 37 and the control cylinder 38. A flexible membrane 37b is suspended from the lower edge of the side wall 37a of the hopper 37 to slightly reduce the number of parts 30 filling the small housings of the rotary control cylinder 38. The control cylinder 38 does not rotate continuously, but only intermittently, depending on the accumulation of parts 30 which have fallen on the alignment table 40. More particularly, a sensor 42 is disposed above the alignment table 40 to detect the parts 30 vertically superimposed on the table 40. The control cylinder 38 stops on a simple signal from the sensor 42. The sensor 42 allows the control cylinder 38 to rotate when the parts 30 arrive at predetermined intervals on the alignment table 40.

The plate or the table for aligning the parts 40 has a peripheral wall 40a having an outlet 43 on the side of the cord conveyor 19. The pile mat 44 made of flexible materials, such as rubber or plastics, has tight pile and leaning in a predetermined direction at a small oblique angle 9 relative to the upper plane of the table 40, as shown in FIG. 5. The table 40 rests at one end on a spring 45, which vibrates in two dimensions - in the longitudinal direction and in the height - thanks to a vibration generator 41. The bristles 44 implanted on the upper plane of the table 40 are regularly oriented obliquely, as indicated for example by the arrows in FIG. 4. When the vibration generator 41 causes the table 40 to vibrate, the bristles 44 tilt in the direction of the height and longitudinal, so as to bring the pieces 30 onto the table 40 in the direction corresponding to the inclination of the bristles 44, while the part 30 is aligned longitudinally along its own axis on the table 40, as shown in close-up FIG. 5. That is to say that the part 30 does not roll along its body of round section, but that it is

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4

progressively brought in by sliding along its longitudinal axis with maximum resistance in advance against the bristles 44 to be then expelled by the outlet 43 from the table 40.

Another hopper 46 is provided next to the outlet 43 of the table 40. Two ropes 47 of the rope conveyor 19 are arranged in parallel, at the bottom of the hopper 46. Since the ropes 47 of the rope conveyor 19 are installed at a distance slightly greater than the outside diameter of the body of the part 30, the parts 30 which are thrown into the hopper 46 are then taken at their flanges 33 between the strings 47, which results in that they are driven the along the string conveyor 19 in the neck up position 31, suspended from the strings 47.

Fig. 6 shows another preferred design of the parts alignment block comprising a reserve of parts 48 formed between the third horizontal conveyor 17 and the hopper 37. This reserve 48 consists of a box 50, coated on its internal walls with a buffer material intended to prevent the part 30 from being damaged, a pivot axis 49 which supports the box 50 and allows it to tilt, a flange 51 fixed on the bottom of the box 50 and a telescopic cylinder 52 for telescoping a piston rod 53 attached to the flange 51.

In the modified design shown in FIG. 6, the parts 30 routed via the third horizontal conveyor 17 are temporarily stored in the box 50. The cylinder 52 is actuated to telescoping the piston rod 53 which it contains, in response to the molding speed of the biaxially oriented blow molding machine 24, in order to tilt the box 50 and thus pour the pieces 30 into the hopper 37. Then the pieces 30 are aligned longitudinally; they are then engaged from the outlet 43 of the alignment table 40 by the string conveyor 19 and brought into the neck up position and suspended from the strings 47 of the string conveyor 19 to the following coin reversing mechanism 21, then to the coin insertion mechanism 22, in the same way as with the coin alignment system shown in FIG. 4.

A parts feed block 56 is provided at the drive end of the rope conveyor 19, as shown in Figs. 7, 8 and 10. The parts supply unit 56 comprises a parts supply slide 57 intended to guide the parts 30 leaving the rope conveyor 19, and a parts insertion lever 58 for sliding insertion of the part 30 advanced to the end of the feed slide in the insertion position of the parts insertion mechanism 21 by means of a set of cams. The detailed configuration and operation of the parts power supply 56 will be discussed below.

The parts 30 thus brought to the parts supply unit 56 are then routed to the parts inversion and insertion mechanisms 21 and 22. The parts inversion mechanism 21a is intended, as shown in FIGS. 7 to 11, attract the parts 30 supplied by the parts supply unit 56 and hold them there, then turn them upside down, neck down, while rotating the parts 30 180 ° in a horizontal plane. The coin reversing mechanism 21 has a vertical axis 60 fixed at its center, and four sets of supports 61 formed on the vertical axis 60 to attract the bodies of the coins 30 and thus hold them by means of negative pressure.

The corresponding supports 61 of the reversing mechanism 21 are arranged at the circumference of the vertical axis 60, every 90 °, and they rotate in steps of 90 ', so that they rotate around their own axis to reverse the position of the part 30 by putting it upside down, neck down, relative to the position for holding the part during the rotation of two phases.

Fig. 7 shows the example of the parts supply block 56 located at the upper right, to supply the parts 30 which are attracted and then held by the supports 61, then reversed upside down, neck down, in the rotational position 180 °

around axis 60 taken as the center; they thus have the position required to be brought to the retaining lugs 83 of the parts insertion mechanism 22.

A rotary frame 67 is mounted integrally in rotation with the reversing pinion 66 of a control unit 65, which will be described below in more detail, at the upper part of the vertical axis 60. Four support blocks 68 are fixed every 90 ° from the central angle to the lower surface of the flange, at the base of the rotary frame 67.

Four rotary axes 69 are rotatably mounted with the corresponding bearing blocks 68, along the same circumference of the vertical axis 60 as the center of the corresponding axes and the supports 61 are fixed to the ends of the respective rotary axes 69.

Each of the supports 61 maintains each of the parts 30 supplied by the parts supply unit 56, in contact via a contactor 70, of soft and elastic material such as rubber or the like, duly fixed.

A reversing bevel gear 71 or 72 is fixed to the internal ends of two opposite rotary axes 69 on the four, to support the respective supports 61 at their ends, in engagement with the stationary pinions 73 and 74, of the same number of teeth, fixed to the rotary axes 60.

The bearing blocks 68 are fixed, at their lower ends, to a sliding circular plate 76, to support the lifting force of an air exhaust block 78 always caused by a spring 77 through the sliding circular plate 76 .

As shown in particular in FIGS. 7 and 10, an air evacuation orifice 81 is clearly drilled, in the form of a semi-circumference, in the air evacuation block 78, to ensure communication with an air evacuation passage 80 formed in the vertical axis 60 along the latter on one side, as well as on the other, by the sliding circular plate 76, with the orifices 82 perforated in the bearing blocks 68, said orifices 82 communicating in their turn , via the holes drilled in the center of the contactors 70, with the other corresponding perforated holes in the respective rotary axes 69.

Since the air exhaust orifice 81 thus formed in the air exhaust block 78 is in the range from the supply position of the part to the position for bringing the parts 30 to parts insertion mechanism 22 on a half-circumference, the vacuum operation of a vacuum pump (not shown) connected to the air exhaust passage 80 is only applied to the support (s) 61 arranged so as to rotate in the position of the range from the position of feeding the parts to the position of arrival of the parts 30 to the insertion mechanism 22.

As is evident from FIG. 10, the reason why the surface for cutting the orifices 81 and 82, at the position of arrival of the parts 30 at the insertion mechanism 22, is smaller than that which corresponds to the other position, is that the force holding the support 61 intended to hold the part 30 is weakened at the position of arrival of the part 30 to the insertion mechanism 22 to bring the part 30 of the support 61 to a pair of retaining lugs 83, so that the part 30 is preferably brought smoothly from the support 61 to the retaining tabs 83.

As is clear from the preferred version shown in Figs. 7 and 10, the reversing pinions 71 and 72, of a different diameter, remain engaged with the opposite pair of corresponding rotary axes 69 via the vertical axis 60 and they are also engaged with the stationary pinions 71 and 72, which have the same number of teeth, but a different diameter, respectively. This is due to the fact that, if the reversing pinions of the same diameter remain in engagement with the corresponding rotary axes 69, the adjacent reversing pinions act one on the other to prevent the execution of the desired rotation operation; as a result, the diameters of the reversing pinions are different, so as not to cause interference between the reversing pinions fixed on the adjacent rotary axes 69.

It should be noted that the reversing pinion 71 and the stationary pinion 73 remaining in engagement with the reversing pinion 71 must have the same number of teeth, and that the reversing pinion 72 and the pinion

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stationary 74 remaining engaged with the reverse gear 72 must also have the same number of teeth.

The feed mechanism of the assembly 23 is arranged under the place where the part 30 is thus turned upside down, with the neck down. The supports 27 supported by the attachments of a chain are then routed at a predetermined rate to the supply mechanism of the assembly 23, as has been described above. The parts 30 are then inserted into the respective supports 27 by the action of the insertion mechanism 22.

The mechanism for inserting the parts 22 has the effect of clamping the inverted part 30, neck down, by means of the retaining tabs 83, following the path of movement of the supports 27 and descending to insert and engage the part. 30 thus held in the support 27.

More specifically, a rotary support 84 is mounted fixed, in a rotary manner but in elevation, to the lower part of the vertical axis 90 tightly fixed in parallel on the vertical axis 60, in the vertical position. A predetermined number of guide pillars 85 (four series of 8 in the version shown) are erected and fixed to the rotary support 84.

The basic rotary supports 86 are mounted in a mobile position and in elevation every 90 ° of central angle around the vertical axis 90 as a center, for the corresponding guide pillars 85; they are each provided with two retaining tabs 83 to clamp the part 30 between them.

As shown in fig. 10, each of the retaining tabs 83 comprises two tabs which face each other and which are mounted to tilt, on a horizontal plane, outwards and inwards, at their base ends, by means of a articulation pin 87 in the vicinity of the front surface of the base support 86, of elastic parts 88 of plastic material such as rubber or the like, mounted at the level of the front half-sectors facing the inside of the lugs 83, so to establish direct contact with the part 30, and tension springs 89 mounted between the base and the latches inwards so that they come closer.

A pusher 91 is projecting towards the base ends of the latches 83 thus mounted with the hinge pin 87, and it is inserted so as to slide in the perforated orifice 93 in the rotary base support 86 in order to be able to slide in the radial direction from the axis 90 as the center. The pusher 91 is then passed over the surface of a cam 94 fixed to the vertical axis 90, to the surface of the base end, namely the base end projecting from that which faces the vertical axis 90 of the basic rotary support 86.

As is evident from FIG. 10, when the base supports 86 rotate integrally with the rotary support 84 and the guide pillars 85 around the vertical axis 90 to the clamping position of the part 30, the cam 94 rotates to enable the pusher to be delayed 91 on the radial plane, towards the vertical axis 90, in order above all to allow the retaining tabs 83 to come together, so that they can clamp the part 30. When the base supports 86 rotate from this position around the vertical axis 90, the pusher 91 moves radially outward from the vertical axis 90. When the base supports 86 continue to rotate from the clamping position of the part 30 via the retaining tabs 83, at a previously selected central angle (approximately 80 ° in the preferred version in fig. 10), up to the insertion position of the part 30, the cam 94 rotates so as to gradually increase the distance between the center of axis 90 and the surface of the cam, in order to release the part 30 from its grip by the retaining tabs 83. The cam 94 is presented on its surface so as to be in the open position of the retaining tabs 83 immediately before the retaining tabs 83 do not clamp the part 30, when the base supports 86 continue to rotate around the vertical axis 90.

Returning to fig. 7, a cam roller 95 is mounted under the base end of each of the base supports 86. The base supports 86 are always pushed down towards the cam roller 95 by a helical spring 97 engaged around the pillar -guide 85

and, consequently, in the direction of the elevation cam 96 fixed on the vertical axis 90.

The base supports 86 make it possible to always push the cam roller 95 on the surface of the elevation cam 96, thanks to the downward compression force of the helical spring 97, so that it moves downwards to insert and engage the part 30 held by the retaining tabs 83 in the assembly 27, by turning from the clamping position of the part 30 to the insertion position of the part 30 around the vertical axis 90, and the initial height , continuing to rotate around the vertical axis 90 to the clamping position of the part 30.

Since the path of the workpiece 30 inserted in the workpiece insertion mechanism 22 coincides perfectly with the path of intermittently the support 27, in the range from the position where the clamping of the workpiece 30 is slightly exceeded at the next intermittent stop position, slightly protruding from the insertion position of the part 30, in the preferred version shown in FIG. 7, and is located directly above the path of the assembly 27, it is advantageous that the part 30 can be inserted by the insertion mechanism 22 anywhere in the range where the two pathways completely coincide , so that it is not always possible to determine with rigor the insertion position of the part 30 in the assembly 27.

It should be noted that, although the displacements in height of the base supports 86 and the operations of opening and closing of the retaining latches 83 are carried out by the cam in the preferred version shown, they can be executed according to a predetermined program , for example thanks to a hydraulic cylinder comprising a telescopic piston rod.

It should also be noted that, although the cam 94 and the elevation cam 96 are constructed differently in the example of the version shown, both can be entirely formed by replacing the cam roller 95 with a drive pin. and engaging the drive lug having a cam groove.

The parts supply unit 56 is provided for bringing the part 30 to the reversing mechanism 21, as has been described above. As shown in particular in fig. 10, the parts supply unit 56 is used to convey the parts 30 one by one, at a determined rate, from the parts supply slide 57, in order to permanently bring the parts 30 to the vertical position, neck up, by means of a cord, to the supports 61 advanced in the position of attraction and of holding the part 30.

More specifically, the parts supply unit 56 includes a parts insertion cam 100 which rotates once, while the supports 61 of the reversing mechanism 21 rotate in 90 ° increments. as well as the parts insertion lever 58 which is engaged in order to be able to tilt thanks to a pivot pin 101. The parts insertion lever 58 has a controlled roller 102 in its center and it is always pushed towards the cam. insertion 100 by a spring (not shown) or the like. The parts insertion lever 58 also includes a sliding groove 103 cut at its end, with the driven roller 102. A movable lug 104a is provided projecting from the upper part of an insertion support 104 kept movable in a rectilinear manner , according to an imaginary rectilinear course going from the center of the vertical axis 60 to the position of supply of the parts, and it is engaged in the sliding groove 103 of the parts insertion lever 58 to move the insertion support by sliding 104 by virtue of the tilting movements of the coin insertion lever 58 around the pivot axis 101 of the coin insertion lever, taken as the center, as a function of the rotation of the coin insertion cam 100.

The insertion support 104 extends the parts supply slide 57 and has two hooks 105 to hold the part 30 in the insertion position.

When the insertion support 104 holds the part 30 in the position for inserting the part 30 by means of the two hooks 105, and

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moves by sliding towards the supports 61, one of the hooks 105 of the insertion support 104 is put in position to insert the part 30 and therefore to prevent the part 30 from being brought from the feed slide 57 at the insertion position of the part 30.

A stop 106 is provided on the side opposite the end of the workpiece supply slide 57 with respect to the insertion support 104 in a manner different from the insertion support 104 to stop exactly the workpiece 30 lowered by sliding by the feed slide 57 to the insertion position of the part 30, as shown in FIG. 8.

Figs. 7, 9 and 10 show the control block 65, which receives the driving force of a main control block, in order to intermittently move the supports 27 which circulate in the biaxially oriented blow molding machine 24 such that 'she introduces herself; the block 65 also drives the inversion and insertion mechanisms 21 and 22, as well as the parts supply unit 56 according to a predetermined program, as a function of the driving force.

More specifically, drive sprockets are mounted so that they can rotate at the lower end of the vertical axis 90 to be driven by the drive force from the main control unit.

The drive pinions comprise a connection pin 108 inserted in a hole 107 open in the lower surface of the projecting rotary support 84 and facing the upper plane of the drive pinions in a cylindrical structure, by the action of the hydraulic fluid. .

The connection pin 108 is brought into the projecting position through the hydraulic fluid supplied as a function of the detection signal of a detector 110 for detecting the support 27 arranged exactly in the appropriate position, by a ventilation opening 109 formed in the vertical axis 90.

A control pinion 111 is fixed, so as to be able to rotate, at the upper part of the vertical axis 90, in engagement with the reversing pinion 66, and which has the same number of teeth as the latter, which is fixed to the upper part of the vertical axis 60.

As shown in fig. 9, the reversing pinion 66 remains engaged with a timing pinion 112 intended to drive the coin insertion cam 100 with a quarter of the number of corresponding teeth.

When the supports 27 are brought in intermittently, following the operation of the control unit 65, then stop near the clamping position of the part 30, they are detected by the detector 110 using a photoelectric tube, a safety circuit breaker, etc., thereby opening a valve (not shown) triggered by the detection signal from the detector 110, for passing the hydraulic fluid through the ventilation opening 109, so that the connection pin 108 penetrates into the orifice 107 of the rotary support 84, to finally connect the drive pinion fully to the rotary support 84 of the vertical axis 90, taken as the center, relative to the direction of rotation.

When the supports 27 are brought in such a way that the connection pin 108 is inserted into the orifice 107 of the rotary support 84, ie pinion driven in synchronous rotation at the arrival of the supports 27 in order then to rotate the rotary support 84, the drive gear

111 and the reversing pinion 66 at 90 ° from the central angle, and the distributor pinion 112 by one turn.

When the timing pinion 112 thus rotates, the insertion support 104 of the parts supply unit 56 moves by sliding to push the part 30 brought into the appropriate position towards the support 61. The reversing support 104 is moved in sliding at a rate such that it advances to push the piece 30 towards the support 61, just before the support 61 is stopped in the position for bringing the piece 30 and, after the support 61 is completely displaced relative to the supply position of the part 30, it is brought back to its initial position before the following support 61 advances into the supply position of the part 30.

Since the holes 82 are placed simultaneously in communication with the air evacuation passage 80 when the support 61 is thus stopped in the supply position of the part 30, the part 30 thus pushed is held by the support 61 thanks to the force of attraction of the vacuum.

The connection pin 108 is brought back to the start of the stopping period of the support 61 to thereby free the insertion of the drive pinion into the orifice 107 of the rotary support 84; however, before the next part 30 is held by the support 61, the connection pin 108 advances to be inserted into the orifice 107 of the rotary support 84, as soon as the detector 110 has detected the assembly 27, in order to thereby connect the drive pinion and the rotating support 84.

The support 61 which holds the part 30 for the following operation reverses the part 30 upside down, neck down, during the progressive rotation around the vertical axis 60 taken as the center.

As shown in fig. 10, since the cutting surface of the air discharge orifice 81 and of the orifice 82 is reduced when the support 61 stops in the clamping position of the part 30, the holding force applied by the support 61 to the part 30 is weakened.

The support 61 rotates around the vertical axis 90 as a center for clamping the part 30 by means of the retaining lugs 83 simultaneously when the support 61 which overturns the part 30 which it maintains stops.

When starting the next intermittent operation, the retaining tabs 83 remove the part 30 from the support 61, taking into account the holding force of the support 61, they rotate around the vertical axis 90 taken as a center, and they descend to simultaneously and gradually release the retaining tabs 83 as the descent makes it possible to release the clamping of the part 30, to insert the part 30 into the support 27 which moves just below the part 30 the along the same lane before reaching the next stop position. The following support 27 is then able to clamp the piece 30, advanced to the next position to break the piece 30 during this operation.

It should be understood, from the above description, that the device for feeding the parts for the blow molding of containers which is the subject of the present invention can permanently convey the molded parts by the injection molding machine. , and that he can then bring the pieces, one by one,

accurately, down to the two-axis blow molding machine, taking into account the molding speed of the blow molding machine.

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Claims (7)

632701 2 1. Part feed installation for a container blow molding machine comprising: - A device for aligning previously molded parts and for the consecutive withdrawal of the parts one by one, depending on the molding speed of the blow molding machine; - a rope conveyor for transporting the parts leaving said alignment device, in the suspended position; - a device for inverting the pieces to attract and hold the pieces transported by said conveyor, in order to put them with the neck down, while the pieces rotate 180 ° around a vertical axis; - a device for inserting parts to move the part down while rotating it gradually and substantially 90 ° on a horizontal plane; A device for supplying returned parts with a retaining means which moves at the level of the heating and blowing mold of the blow molding machine at a predetermined rate, near said device for reversing parts. 2. Installation according to claim 1, in which the parts alignment device comprises a hopper disposed at the inlet end of said parts conveyor, a control cylinder installed laterally at the base of said hopper and a vibrating table intended aligning the pieces dropped from said control cylinder longitudinally and evenly along the longitudinal axis of the piece for evacuation thereof. 3. Installation according to claim 2, wherein said vibrating table comprises a carpet with flexible bristles closely implanted and inclined in a predetermined direction on the upper plane thereof. 4. Installation according to claim 1, wherein said string conveyor comprises a pair of strings installed at a determined distance to support the collar of the part which it must circulate. 5. Installation according to claim 1, in which said device for inserting parts comprises reversing gears fixed to the internal ends of two opposite rotating shafts from among four provided shafts, for supporting the respective supports at the corresponding ends, engaged with one or the other of the stationary pinions, of the same number of teeth, fixed on the rotary axes, and the respective respective supports are brought to rotate gradually 90 ° in a horizontal plane around the vertical axis taken as center, and to rotate simultaneously 90 ° around their own axes. 6. Installation according to claim 1, in which the parts insertion device comprises a push rod sliding radially and provided from the vertical axis, as a center, to the basic rotary support, for opening or closing the latches of retained, and pushed onto the surface of a cam fixed on the vertical shaft, at the base end surface, facing the retaining lugs, and said cam is caused to rotate so as to gradually increase the distance between the center of the vertical axis and the surface of the cam to stop the clamping of the part by the retaining tabs; the configuration is such that, on the surface of the corresponding cam, one is able to open the retaining tabs almost immediately before the tabs clamp the part, when the basic rotary supports continue to rotate around the vertical shaft. 7. Installation according to claim 1, in which the parts insertion device comprises a cam roller mounted under the base end of each of the base supports, a spiral spring for always lowering the base supports, and a cam lifting, the surface of which is pushed, by means of said cam roller fixed to the vertical axis, so that it moves downward in order to insert and engage the part held by the retaining tabs during assembly , by turning from the workpiece clamping position to the workpiece insertion position around the vertical axis and moving upwards to the initial height, continuing to turn around the vertical axis to the workpiece clamping position.