Automatic loader of ferrules for brushes

Abstract: Automatic loader of ferrules (11) for brushes (12) to be fed one at a time to a ferrule-assembling machine, the ferrules (11) being structured in the form of a closed ring of sheet metal, the edges being super-imposed and crushed along one of the narrow sides so as to constitute an outer closing projection (15), the outer closing projection (15) defining a rounded side (16) and a protruding fold (17), the ferrules (11) able to include circumferential ribs (18a, 18b) and/or identification markings, the loader including a feeder-vibrator assembly (19) equipped with a frame (20) comprising, in cooperation with the side wall (21), a guide channel (23) with a transport plane on which the ferrules (11) advance, the bottom wall (24) of the guide channel (23) being connected to the side wall (21) of the frame (20), the guide channel (23) connecting the frame (20) to the loading area of the ferrule-assembling machine, the loader comprising means (29) to monitor the directioning of the ferrules (11) and expulsion means (30) cooperating with the guide channel (23) in a position upstream from the loading area of the ferrule-assembling machine, the expulsion means (30) being governed by monitoring means (29) so as to return an incorrectly directioned ferrule (11) to the frame (20) of the vibrator-feeder assembly (19).

Description: This invention concerns an automatic loader of ferrules for brushes as set forth in the main claim. The invention is applied in the production of brushes, particularly to feed the ferrules in a desired and correct manner to the ferrule-assembling machine located downstream of the loader, wherein the bundle of bristles, and possibly also the handle, is associated with the ferrules. The invention is applied to brushes of the flat type where the ferrule consists of a band of metal strip closed in a ring of whatsoever shape, either rectangular, round, polygonal, etc. Ferrule-assembling machines are known in the brush industry, which are fed separately by bundles of bristles, which constitute the terminal end of the brush, and by ferrules on which the bundles of bristles are attached, normally by means of glueing. The ferrules are made by closing a band of metallic strip in a ring-shape, then super-imposing and crushing the edges along one of the narrow sides so as to constitute an outer closing projection. The ferrules generally bear perimeter ribs and writings to identify the brush such as size, brand name, type of bristle or other information in order to define a univocal position wherein the bundle of bristles and the handle are assembled. The function of the ribs is to stiffen the ferrule but they also function as an element to anchor the adhesive substance, for example the rubber cement, which is used to attach the bundle of bristles to the ferrule. It is the presence of these ribs which determines univocally the side of the ferrule where the bundle of bristles will be inserted and the side of the ferrule, opposite the first, where the handle of the brush will be inserted. At present, the operation of feeding the ferrules into the loader of the ferrule-assembling machine is performed manually by a worker who positions them one by one in the only correct feeding position inside the loader. This manual operation takes a long time and involves a considerable increase in the costs of the operation of assembling the brushes. To be more exact, the fact that the worker must be present conditions the productivity of the ferrule-assembling machine which, for this reason, is slowed down; this signifies that the full potential of the machine is not exploited and therefore businessmen working in this field have been complaining of this problem for some time. To overcome this problem and to automate the step of feeding and loading the ferrules to the ferrule-assembling machine there has been a proposal to combine, upstream of the ferrule-assembling machine, a vibrator-feeder device to feed the ferrules automatically, separating them one by one and sending them towards the feeder zone of the ferrule-assembling machine. This feeder device has the disadvantage that it cannot make a distinction between the side of the ferrule which will cooperate with the bundle of bristles and the side of the ferrule wherein the handle of the brush will be inserted. In order to overcome this problem, the feeder device can be used only with particular ferrules of a symmetrical type, which increases costs due to the production of the said particular ferrules and moreover it means that non-specialised ferrules obviously cannot be used. The document DE 32 42 044 discloses an automatical feeder for non-symmetrical bodies of brushes able to feed these bodies in a desired and correct manner. This feeder comprises monitoring means able to check if the bodies are in their oriented position on a guide channel, and correcting means able to rotate those bodies which are not in an oriented position. These devices are electrical devices and require a power supply with relative connection means. The present applicant has designed, tested and embodied this invention to overcome the shortcomings of the state of the art, and to provide further advantages. The invention is set forth and characterised in the main claim, while the dependent claims describe variants of the idea of the main embodiment. The purpose of the invention is to provide an automatic loader of ferrules for brushes which will ensure the correct positioning and directioning of the ferrules fed to the ferrule-assembling machine, thus allowing only correctly directioned ferrules to be fed. The invention makes it possible to use both ferrules made of plastic material and also ordinary metallic ferrules, made from a strip of metal, either brass, stainless steel or otherwise, closed in a ring and having the outer closing projection on one of the narrow sides. The invention makes it possible to considerably increase the productivity of the ferrule-assembling machine and does not need the constant presence of a worker, with a consequent reduction in the overall costs of the operation to produce the brushes. The loader according to the invention is simple, economical, small in size and does not use any energy in its working. The invention is applied in cooperation with the usual feeder assemblies, whether they be vibratory or not, by means of simple, rapid and inexpensive modifications. The automatic loader according to the invention includes a guide channel, associated with the feeder assembly, for example of the vibratory type, on which the ferrules advance, separated one by one, with the wide face resting on the transport plane of the guide channel and with the open sides arranged in the direction of feed. The guide channel comprises at least a substantially vertical side wall which cooperates with the transport plane. The loader according to the invention comprises, upstream of the inlet to the feeder of the ferrule-assembling machine, means to monitor the directioning of the ferrules, functionally associated with means to expel the ferrules which are not correctly directioned. To be more exact, the expulsion means are governed by the monitoring means and allow only the correctly directioned ferrules to pass towards the ferrule-assembling machine, while they send incorrectly directioned ferrules back inside the vibrator-feeder assembly. According to the invention, the monitoring and expulsion means consist respectively of a control aperture or window, made on a wall of the guide channel and by a protruding restraining element made on another wall of the same guide channel. The control window is longer than the ferrule, the length of the ferrule being measured as the distance between the two open sides thereof, and is slightly less wide than the ferrule. In this embodiment, at least in correspondence with the monitoring means and the expulsion means, the bottom wall of the guide channel slopes towards the side wall where there is the protruding restraining element; this ensures that one of the two narrow sides of the advancing ferrules continuously rests against the side wall of the guide channel where there is the protruding restraining element and therefore ensures that the protruding restraining element cooperates in contact with one of the two narrow sides of the ferrule. When the ferrule is correctly positioned, that is to say, with the outer projection resting on the side wall of the guide channel where there is the protruding restraining element and with the fold of the outer projection facing downwards, the restraining element comes into contact with the fold, and holds the ferrule on the transport plane of the guide channel for the whole time needed to pass by the control window. In all other cases when the ferrule is not correctly directioned on the guide channel, the vibrations cause the ferrule, which is not held laterally by the restraining element, to fall through the control window into the vibrator-feeder assembly again. With this configuration, only those ferrules which are correctly positioned and directioned pass by the control window and are fed in the desired and correct position to the loader of the ferrule-assembling machine located downstream. The attached Figures are given as an non-restricted example and show a preferential embodiment of the invention as follows: Fig. 1 shows in diagram form an assembled brush complete with handle, bundle of bristles and clamping ferrule; Fig. 2 shows a section from A to A of the ferrule shown in Fig. 1; Fig. 3a shows in diagram form a side view of an automatic loader according to the invention; Fig. 3b shows in diagram form a view from above of the automatic loader as shown in Fig. 3a; Fig. 4 shows in diagram form, on an enlarged scale, a view from above of a detail of the automatic loader as shown in Fig. 3a; Figs. 5a, 5b and 5c show in diagram form, with a section from B to B, three ferrules in different positions cooperating with the monitoring and expulsion means of the loader according to the invention; Fig. 6 shows on an enlarged scale a variant of Figs. 5a, 5b and 5c. The reference number 10 denotes generally an automatic loader of ferrules 11 which is applied in the production of brushes 12 of the flat type comprising a ferrule 11 to which on one side a bundle of bristles 13 and on the other side a handle 14 are solidly associated. The ferrule 11 is of the type which is obtained by closing a band of metallic strip in a ring shape, then super-imposing and crushing the edges along one of the narrow sides so as to constitute an outer closing projection 15. The outer closing projection 15, in this case, includes a rounded side 16 and a protruding fold 17. In this case, the ferrule 11 includes a circumferential rib 18a associated with the edge cooperating with the handle 14 and two circumferential ribs 18b associated with the edge cooperating with the bundle of bristles 13. The ferrules 11 shown in Fig. 3b, moreover, include identification markings, in this case a number indicating the size of the brush 12 which, in cooperation with the ribs 18a and 18b define a univocal position wherein to assemble the bundle of bristles 13 and the handle 14 with respect to the ferrule 11 itself. The automatic loader 10 according to the invention comprises a vibrator-feeder assembly 19 equipped with a substantially cylindrical frame 20 to whose side wall 21 there is a guide channel 23 associated on which the ferrules 11 travel in a line and one by one. The ferrules 11 are loaded pell-mell into the frame 20 where they are then separated by the vibration and are aligned on the transport plane of the guide channel 23. In this case, the outer terminal segment of the guide channel 23 is associated with insertion means 27 to insert the ferrule 11 into the loader 28 of the ferrule-assembling machine located downstream and not shown here. The loader 10 according to the invention includes, upstream of the ferrule-assembling machine, means to monitor the directioning of the ferrules 11 which are functionally associated with means to expel the ferrules 11 not correctly directioned. To be more exact, the cooperation between the monitoring means and the expulsion means is such that only the correctly directioned ferrules 11 are sent to the ferrule-assembling machine whereas the incorrectly directioned ferrules 11 are sent back to the frame 20. In the embodiment shown in Figs. 3a-6, the guide channel 23, at least in correspondence with the monitoring means and expulsion means, has the bottom wall 24 which defines the transport plane sloping downwards in the direction of the side wall 21 of the frame 20, so as to ensure a constant and continuous contact of the ferrule 11 with the side wall 21. In this embodiment, the expulsion means of the automatic loader 10 consist of a control and discharge window 22, made on the bottom wall 24 of the guide channel 23, which is longer than the ferrule 11 as measured between the two open faces wherein respectively the handle 14 and the bundle of bristles 13 are inserted, and is coordinated in width to the width of the ferrule 11. The means to monitor the directioning of the ferrules 11 consist of a restraining element 25, associated with the side wall 21 of the guide channel 23, which has the function of cooperating with the protruding fold 17 of the outer closing projection 15 of the ferrule 11 in order to hold only the correctly positioned ferrules 11. In the variant shown in Fig. 6, the restraining element 25 has its upper edge 26 shaped like a wedge so as to facilitate a better grip on the protruding fold 17 of the outer closing projection 15 of the ferrule 11. In the embodiments shown, the restraining element 25 is an integral part of the side wall 21. According to a variant which is not shown here, the restraining element 25 consists of an autonomous element, such as for example a metallic blade, whose lower part is associated solidly with the side wall 21 of the guide channel 23 in correspondence with the control and discharge window 22. As shown in Figs. 5a and 5b, when the ferrules 11 as they advance are not correctly positioned on the guide channel 23 in correspondence with the control and discharge window 22, the ferrule 11 which is not restrained by the restraining element 25 slips and falls through the control and discharge window 22 inside the frame 20. To be more exact, this is due to the downward inclination of the bottom wall 24 in the direction of the side wall 21 and to the fact that the restraining element 25 cooperates either with a smooth section of the edge of the ferrule 11 (Fig. 5a) or with the rounded section 16 of the projection 15 (Fig. 5b). It is only if the ferrule 11 is in a correct position that the restraining element 25 cooperates with the protruding fold 17 of the projection 15, and thus restrains the ferrule 11 in the guide channel 23 so that it can pass over the control and discharge window 22 and can continue towards the ferrule-assembling machine.

Claims: Automatic loader of ferrules (11) for brushes (12) to be fed one at a time to a ferrule-assembling machine, the ferrules (11) having the form of a closed ring, their edges being super-imposed and crushed along one of their narrow sides so as to constitute an outer closing projection (15) defining a protruding fold (17), said ferrules (11) able to include circumferential ribs (18a, 18b) and/or identification markings, said loader including a feeder-vibrator assembly (19) equipped with a frame (20) comprising, in cooperation with the side wall (21), a guide channel (23) with a transport plane for the ferrules (11), the bottom wall (24) of the guide channel (23) being connected to the side wall (21) of the frame (20), the guide channel (23) connecting the frame (20) to a loading area (28) of a ferrule-assembling machine, said loader comprising means to monitor the directioning of said ferrules (11) and expulsion means cooperating with the guide channel (23) in a position upstream from said loading area (28), said expulsion means being governed by said monitoring means so as to return an incorrectly directioned ferrule (11) to said frame (20), characterised in that said expulsion means comprise at least a control and discharge window (22) provided on the bottom wall (24) of said guide channel (23), said control and discharge window (212) having a width coordinated with the width of said ferrule (11) and a length greater than the length of said ferrule (11), and said monitoring means comprise at least an element (25) provided on a side wall of said guide channel (23) and cooperating with said protruding fold (17) of said outer closing projection (15) of said ferrule (11), said element (25) functioning as a restraining element for the ferrules (11) correctly oriented during their passage above said control and discharge window (22) and causing instead the fall of the incorrectly oriented ferrules in said control and discharge window (22). Automatic loader as in Claim 1, characterised in that said bottom wall (24) of the guide channel (23) slopes downwards in the direction of said side wall (21) of the frame (20) at least in correspondence of the position of said element (25). Automatic loader as in Claim 1 or 2, characterised in that said restraining element (25) comprises an upper edge (26) shaped like a wedge and a lower edge which is in contact with said side wall (21) of the frame (20). Automatic loader as in any claim from 1 to 3 inclusive, characterised in that said restraining element (25) is an integral part of said side wall (21) of the frame (20) of the vibrator-feeder assembly (19). Automatic loader as in any claim from 1 to 3 inclusive, characterised in that said restraining element (25) is an autonomous element which is solidly associated with said side wall (21) of the frame (20) of the vibrator-feeder assembly (19).

Inventors: POLESE GIOVANNI PIETRO, POLESE, GIOVANNI PIETRO
Applicants: POLESE GIOVANNI AUTOMATION SRL
Application year: 1997
Main classification: A46D3
IPC codes: B65G47, A46D3