DEVICE FOR FEEDING HARD-GELATIN CAPSULES TO A CAPPING MACHINE

Abstract: Respective secondary thrusters (70, 71) are added to the primary horizontal thruster (7) and primary vertical thruster (12) of a guiding device of the known type and the guide channel (6) is provided with dimensions such that the steps of guiding and feeding the capsule (C) are performed with minor successive displacements of the said capsule (C). The primary vertical thruster (12) operates, in a position distant from the sleeve (13) of the capping machine so as to allow discarding and free removal of the defective capsules (C) which have a double lid (C2) or the capsule parts which reach this thruster. The last section (206) of the guide channel (6) inside which the secondary vertical thruster (71) operates, has a width slightly smaller than that of the upstream section (106) of the said channel so as to retain firmly the end of the defective capsule (C) having lids (C2) on opposite ends of a base (C1). Such a defective capsule (C), which is arranged horizontally or inclined by the primary horizontal thruster (7), is then acted on by the tip (112) of the primary vertical thruster (12) and by a face (171) of the secondary vertical thruster (71) which discard this defective capsule (C) from the bottom of the guide channel (6). On the other hand, a capsule (C) correctly fitted with a lid (C2) and oriented vertically by the primary vertical thruster (12) remains inside the guide channel (6), is then displaced inside the latter by the secondary horizontal thruster (70) and then a leading face (271) of the secondary vertical thruster (71) acts on this capsule and accompanies the said capsule (C) during the complete stroke for insertion inside the sleeve (13) of the capping machine.

Description: TITLE: "Device for feeding hard-gelatin capsules to a capping machine" DESCRIPTION The invention is applied industrially in the sector of pharmaceutical machines known as capping machines operating intermittently or continuously and designed to open, fill and close hard-gelatin capsules which are fed pre-closed to said machines. In particular, the invention refers to the devices which feed the capsules into the seats or sleeves of the capping machines. Figures 1 and 2 in the accompanying drawings show, with parts sectioned and in different operating conditions, a side elevation view of a known device for feeding the capsules to the sleeves of a capping machine. From the said figures it can be seen that the hard-gelatin capsules C are provided with a bottom cap or base C1 with a rounded end, onto which a covering cap or lid C2 with a rounded end is fitted. The external diameter of the base C1 is usually less than the external diameter of the lid C2. The empty and pre-closed capsules C are placed randomly inside a hopper - not shown - inside which a hollow and vertical tube 1 enters at the bottom and moves axially with an alternating movement, the internal diameter of said tube being slightly greater than the external diameter of the lid C2 of the capsules C such that the latter enter into the tube in succession, vertically arranged and randomly oriented. An intercepting element 2 is laterally hinged on the tube 1 at the pivot 3 and, via spring means (not shown), is normally kept in the active position for retaining the capsules C inside the tube 1 when the latter is raised as shown in Figure 2 and which, when instead the same tube 1 is lowered as shown in Figure 1 , interferes with stopping means 4 and retracts so as to allow a capsule C to fall into a calibrated well 5 where the said capsule C remains in a vertical position resting on the bottom 105 of said well. The well 5 is located in the middle part of a horizontal, straight and flat channel 6, an end section 106 of which has a width slightly smaller than the external diameter of the lid C2 of the capsules C, while in the section at the opposite end of the same channel 6 there slides a horizontal thruster 7 provided on its face directed towards the well 5 with a tip 107 located about halfway up the height of this well 5. The thruster 7 is for example hinged at 10b, via a connecting rod 8, with an angled lever 9 which is pivotably mounted in between at 10 on a fixed support 11 and hinged at 10a with the slide 101 which supports the tube 1 and from which the said thruster 7 derives the movement which causes it to move to the right when the tube 1 is raised as shown in Figure 2 and instead causes it to return into the rest position as can be seen in Figure 1 , when the said tube 1 is lowered. During operation of the apparatus, when the thruster 7 moves to the right, its tip 107 touches, in the middle part, the capsule C located inside the well 5 and pushes it into the section 106. If the capsule C is oriented with its base C1 upwards, the tip 107 and the friction of the channel section 106 against the lid C2 have the effect that the said capsule C follows the movement of the thruster 7, rotating in an anti-clockwise direction when viewing Figure 1 , until it reaches the position shown in continuous lines and indicated by C in Figure 2. If, on the other hand, the capsule C is oriented inside the well 5 with its lid C2 downwards, the said capsule C follows the movement of the thruster 7 and at the same time rotates in the clockwise direction when viewing Figure 1 and reaches the position shown in broken lines and indicated by C" in Figure 2. In either case, after the active stroke of the thruster 7, the capsule C reaches the end part of the section 106 of the channel 6, arranged substantially horizontally and with the lid C2 again directed to the left when viewing Figure 2. From Figures 1 and 2 it can be seen that the tube 1 has, associated with it, a vertical thruster 12 with a tip 112 directed towards the middle part of the capsules in the positions C or C", so that when the horizontal thruster 7 returns into the rest position after lowering of the tube 1 , the vertical thruster 12 pushes the capsule C downwards and at the same time causes it to rotate clockwise when viewing Figure 1 , again owing to the friction exerted by the section 106 of the channel 6 on the lid C2 of the said capsule C, until the said capsule C mates with the rounded recess 212 in the thruster 12 and is arranged vertically with the lid C2 upwards and the base C1 downwards. In this condition the capsule is made to leave the bottom part of the section 106 of the channel 6 and fall into the sleeve 13 of one of the radial slides S of the capping machine carousel, the sleeve 13 being shaped so as to retain the capsule by means of the step formed by the edge of the lid C2. At present, in the known devices of the type described above, owing to the relative movements which the capsules C undergo during storage, transportation and introduction into the said feeding hopper, and also owing to the alternating movement of the tube 1 inside said hopper, a capsule C may open and the well 5, instead of receiving a capsule C together with its associated lid C2 directed downwards or upwards, may receive only the base C1 of a capsule C or else a capsule C which below will be described by the term "defective capsule" and which has two lids C2 on one end or on the opposite ends of a base C1. In such cases, the base or the defective capsule with the two lids C2 are transferred by the horizontal thruster 7 above the sleeve 13 so that only the base C1 is able to fall by means of gravity inside the sleeve 13, or the subsequent intervention of the vertical thruster 12 may insert the defective capsule C with the two lids C2 into the sleeve 13, consequently obstructing the said sleeve 13 and in certain cases causing blockage of the capping machine. The invention intends to overcome the said drawback and limitation of the known art with the following proposed solution. Respective secondary thrusters are added to the horizontal and vertical thrusters or primary thrusters and the guide channel is provided with dimensions such that the capsule guiding and feeding steps are performed with minor successive displacements of the said capsule. For this purpose the primary vertical thruster is made to operate in a position distant from the capping machine sleeve, i.e. at a distance such as to allow discarding and removal of the defective capsules with a double base or the individual bases of the said capsules. The portion of the guide channel section inside which the secondary vertical thruster operates is provided with dimensions such that it has a width slightly less than that of the upstream portion of the said channel section in order to retain firmly the ends of any defective capsules which have lids on the opposite ends of a base. Such a defective capsule, arranged horizontally or inclined by the primary horizontal thruster, is then acted on both by the tip of the primary vertical thruster and by a front and rear face of the secondary vertical thruster able to expel this defective capsule from the bottom of the guide channel. Further characteristic features of the invention and the advantages arising therefrom will emerge more clearly from the following description of a preferred embodiment thereof, illustrated purely by way of non-limiting example in the figures of the attached sheets of drawings, in which: - Figs 1 and 2 are side views, with parts sectioned, of the known guiding and feeding device described in the introduction of the present description and shown during successive working stages; - Figs 3 and 4 are side views, with parts sectioned, of the improved device according to the invention shown in the different end-of-travel positions of the thrusters; - Fig. 5 is a schematic, partial, top plan view of one of the devices in question; - Figs 6, 7 and 8 show the device in question laterally, with parts sectioned, during successive operations involving a capsule with a double lid. From Figures 3 and 4 it can be seen that a secondary horizontal thruster 70 is now associated at the bottom of the primary horizontal thruster 7, of the type considered with reference to Figures 1 and 2, the front face 170 of the former being vertical and flat or slightly curved so as to match the rounded shape of the capsule C with which it comes into contact and being located suitably in advance of the tip 107 of the said primary thruster 7. The secondary thruster 70 operates below the well 5 which is closed at the bottom by the bottom or baffle 105. The guide channel 6 is now provided with dimensions such as to retain the capsules C moved by both the thrusters 7 and 70, as will be explained further below. From the detail shown in Figure 5 it can be seen that the section 106 of the channel 6 guiding the capsules C extends lengthwise beyond the primary vertical thruster 12 with a portion 206 having a width equal to that of the said section 106 or preferably a slightly smaller width. A secondary vertical thruster 71 associated with the primary vertical thruster 12, the tip 112 of which is now shorter than that of the vertical thruster of the known type (Figs 1 and 2), operates above the guide channel section 206 (Figs 3, 4). The front face of the secondary thruster 71 has a stepped configuration and has a first substantially horizontal set-back section 171 having a length slightly less than that of a capsule and located slightly above the tip 112, and has a second advanced section 271 with a width approximately equal to that of a capsule and characterized by a small convexity directed downwards. The face 171 is located at a distance from the face 271 greater than the thickness of a capsule C. The apparatus thus designed operates in the manner described below. If the capsule C introduced from the tube 1 into the well 5 is normally closed and has its lid C2 directed upwards or downwards, after the stroke of the primary horizontal thruster 7 the said capsule C will reach, respectively, the position indicated by C or C" in Figure 4, always with the lid C2 making contact with the said thruster 7. During the subsequent return stroke of the horizontal thruster 7, the tip 112 of the primary vertical thruster 12 comes into contact with the lid C2 of the capsule C in one of the said positions and causes the said capsule C to rotate clockwise when viewing Figure 4, until the same capsule C is arranged vertically and is inserted with the lid C2 into the recess 212. At the end of the active stroke of the primary vertical thruster 12, the capsule C reaches the position indicated by C" in Figure 3. During the subsequent raising stroke of the vertical thrusters 12, 71 , while the primary horizontal thruster 7 acts on a new capsule, the secondary horizontal thruster 70 touches the lid C2 of the capsule C in the said position C" and displaces it horizontally into the position C"" indicated in Figure 4, where the said capsule C is aligned with the sleeve 13 of the slide S. During the subsequent operating stroke of the vertical thrusters 12, 71 , the capsule in position C"" is inserted into the sleeve 13 by the leading face 271 of the secondary vertical thruster 71 , which accompanies the said capsule C during the whole stroke where it is introduced into the said sleeve 13, as illustrated in Figure 4. If a defective capsule C reaches the well 5, with two lids C2 mounted on the opposite ends of a base C1 , as illustrated in Figure 6, after the active stroke of the main horizontal thruster 7, the said defective capsule C is transferred into the position indicated for example by C or C" in Figure 7, with one of the lids C2 inside the end part 206 of the channel 6 which, being slightly narrower than the section 106 of the said channel, ensures stable mating of the lids C2 with the base C1 of the capsule C, so as to ensure subsequent complete elimination of the defective capsule C. In fact, when the primary vertical thruster 12 intervenes, its tip 112 touches the middle part of the capsule C which is stationary at C or C" and causes it to rotate anti-clockwise since the said capsule C is retained mainly by the channel end section 206. The defective capsule C fitted with two lids C2 is arranged in contact with the tip 112 and with the front face 171 of the secondary vertical thruster 71 and, during the downwards movement of this secondary thruster, the said defective capsule is expelled from the bottom part of the section 106 of the guide channel 6, as illustrated in Figure 8. If, on the other hand, only the base C1 of a capsule C reaches the well 5, said base falls from the bottom of the guide channel 6 after the active stroke of the primary horizontal thruster 7, as in the known art, with the difference that now the base C1 falls initially onto the secondary horizontal thruster 70 and, when the latter retracts, the said base C1 interferes with the baffle 105 and leaves, by means of gravity, the guide channel 6 in a position far from the sleeve 13. If, on the other hand, a defective capsule C reaches the well 5 with two lids C2 inserted inside one another on a base C1 , it may happen that the two lids C2 are directed upwards or downwards. In the first case the additional lid C2, or the outer lid C2, is retained by the device 2 for intercepting the tube 1. If, on the other hand, the two lids C2 are directed downwards, the capsule C provided with a single lid C2 is retained by the device 2 of the tube 1 and only the outer lid C2 remains inside the well 5 and, owing to the action of the various primary and secondary thrusters, is able to follow the path of a defect-free capsule and reach the sleeve 13 of the capping machine. By means of sensors applied to the known suction devices designed to open the capsules C in the capping machine, it is possible to detect that there is only one lid C2 inside the sleeve 13 and transmit the information to the electronic control processor of the machine which will ensure that the missing capsule is not filled, while the lid C2 will be eliminated during the final sleeve- cleaning stage. Finally, special means, not shown, are provided for removing from the capping machine, and collecting, the capsule rejects discarded from the bottom of the guide channel 6. A further advantage resulting from the device according to the invention consists in the fact that the secondary vertical thruster 71 , with its leading face 271 , accompanies the capsule C during the whole of the insertion stroke inside the sleeve 13 of the capping machine, ensuring correct introduction thereof. In the known devices, on the other hand, as shown in Figure 1 , the vertical thruster 12 abandons in advance the capsule which is discarded from the guide channel 6, which enters the sleeve 13 only by means of gravity.

Claims: CLAIMS 1 ) Device for feeding hard-gelatin capsules to a capping machine, of the type which comprises: - transportation means (1 ) for cyclically feeding a capsule (C) with a random vertical arrangement into a well (5) arranged in the middle part of a horizontal guide channel (6) underneath which a sleeve (13) of the capping machine is cyclically aligned; - primary horizontal thrusting means (7), movable in an alternating manner inside the said guide channel (6) with a horizontal forward and return movement, so as to push with its tip (107) a middle part of the capsule (C) so as to arrange the said capsule (C) horizontally, with its base (C1 ) directed forwards; - primary vertical thrusting means (12) which are located above the said guide channel (6), aligned with the said sleeve (13) of the capping machine and movable in an alternating manner with a forward and return movement so as to push with its tip ( 12) against the lid (C2) of a capsule (C) displaced inside the said channel (6) by the said primary thrusting means (7), while these thrusting means retract, so as to move said capsule downwards and arrange it vertically, with the base (C1 ) directed downwards; the device also being characterized in that: - the said guide channel (6) is provided with dimensions such as to have a height and a length greater than that of the known art, so as to retain, via the lid (C2), the capsule (C) displaced by the said primary vertical thruster (12) and arranged vertically with its base (C1 ) directed downwards; - secondary horizontal thrusting means (70) are associated with the said primary horizontal thrusting means (7), underneath said means, and the front face ( 0) of these secondary thrusting means being in an advanced position with respect to the tip (107) of the said primary horizontal thrusting means, so as to act on the lid (C2) of the capsule (C) guided by the primary vertical thruster (12) and bring the said capsule (C) into alignment and above a sleeve (13) of the capping machine; - secondary vertical thrusting means associated laterally with the said primary vertical thrusting means (12), these secondary thrusting means (71 ) having a first front face (271 ) in an advanced position with respect to the tip (112) of the said primary vertical thrusting means (12), so as to act on the capsule (C) displaced by the said secondary horizontal thruster (70) and insert it into the said sleeve (13) of the capping machine, and the said secondary vertical thrusting means (71 ) having a second front face (171 ) located in the region of the tip (112) of the said primary vertical thrusting means (12) so as to come into contact, via said tip, with a defective capsule (C) and expel it from the bottom of the said guide channel (6) during the vertical outward movement downwards of the said secondary vertical thrusting means (71 ). 2) Device according to Claim 1 , characterized in that the first front face (271 ) of the secondary vertical thrusting means (71 ) has a slight convexity which matches the rounded shape of the lid (C2) of the capsule (C). 3) Device according to Claim 1 , characterized in that the second front face (171 ) of the secondary vertical thrusting means (71 ) has a width less than the length of a capsule (C). 4) Device according to Claim 1 , characterized in that the first front face (271 ) of the secondary vertical thrusting means (71 ) is located at a distance from the said second face (171 ) which is slightly greater than the thickness of a capsule (C). 5) Device according to Claim 1 , characterized in that a last section (206) of the guide channel (6), inside which the secondary vertical thrusting means (71 ) operate, has a width slightly less than that of the said guide channel (6) so that, if a defective capsule (C) with two lids (C2) reaches this channel section (206), the said defective capsule (C) is subject to an axial compression which ensures stable mating of the lids (C2) with the base (C1 ), while the said defective capsule (C) remains in a horizontal position and is expelled from the guide channel by the said secondary vertical thrusting means (71 ).

Inventors: TREBBI ROBERTO, TREBBI, ROBERTO
Applicants: IMA SPA, TREBBI ROBERTO, I.M.A. INDUSTRIA MACCHINE AUTOMATICHE S.P.A., TREBBI, ROBERTO
Application year: 2000
Main classification: A61J3
IPC codes: A61J3, B65B35