Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
  • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
  • B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
  • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
  • B07C5/04—Sorting according to size
  • B07C5/10—Sorting according to size measured by light-responsive means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
  • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
  • B07C5/34—Sorting according to other particular properties
  • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour

Definitions

• a UTOMATIC MACHINE FOR NON-CONTACT SORTING The present invention relates to an automatic machine for non-contact sorting which is particularly recommended for checking for the presence of defects in rubber articles.
• the equipment currently available on the market is of the contact type, i.e. the piece rests on a surface or is retained by a robotic element, which means the checking for defects requires a certain amount of time and productivity is rather low. Furthermore, when the pieces are made of static materials, productivity drops still further because the handling thereof is even slower. Additionally, when it is necessary to view the other side of the piece, it is necessary to turn it over, a condition which results in a still further reduction in productivity. As mentioned earlier, existing machines permit viewing of the piece on one side only, which means the possibility of having pieces which do not comply with requirements is extremely high, nearing 50%.
• existing machines have shown difficulty in managing the pieces as they have to view different-sized pieces, which means, for example, that when they are very small, with an external diameter of 10 mm, and are very light, the machine has shown difficulty in conveying the pieces without them jumping and dispersing.
• the structure of existing machines does not meet accident-prevention regulation requirements, as the structure is so heavy and features sharp edges which are hazardous for workers who interact with the machine.
• the aim of the present invention is essentially to solve the problems of the known technique by overcoming the difficulties described above by means of an automatic machine for non-contact sorting which can offer notable piece viewing precision, with high resolution, working on both sides thereof simultaneously.
• a second aim of the present invention is to provide an automatic machine for non-contact sorting capable of permitting the viewing of the pieces without contact in an extremely fast manner and with improved productivity.
• Another object of the present invention is to have an automatic machine for non-contact sorting which is structurally simple and is extremely functional, easy to maintain, and compact in size.
• a further aim of the present invention is to have an automatic machine for non-contact sorting which is capable of sorting from a few to very many pieces and which can also be used by disabled workers.
• a further but not final aim of the present invention is to have an automatic machine for non-contact sorting which can contain production, running, and maintenance costs, in addition to allowing energy saving in consumption terms.
• a still further but not final aim of the present invention is to produce an automatic machine for non-contact sorting which is easy to manufacture and works well.
• FIG. 1 shows, schematically and from a perspective view, an automatic machine for non-contact sorting according to the present invention
• Figure 2 shows, schematically, a frontal view of the machine in Figure 1 ;
• Figure 3 shows, schematically, a top view of the machine in Figure 1 ;
• FIG. 4 shows, schematically, a side view of the machine in question
• FIG. 5 shows, schematically, a further side view of the machine according to the present invention.
• FIG. 6 shows, schematically, a detail of the machine in Figure 2;
• FIG. 7 shows, schematically and from a front perspective view, the containment structure of the machine in question;
• FIG 8 shows, schematically and from a rear perspective view, the containment structure of the machine in Figure 1 .
• n. l denotes an automatic machine for non-contact sorting as a whole, according to the present invention.
• the machine 1 is essentially composed of a load-bearing structure 2 built using profiles made of a metallic material, preferably aluminium, envisaged to house therein a pair of stations, namely a piece supply unit 3 and a piece control unit 4.
• the piece supply unit 3 comprises a storage area 30 which is connected to an elevator belt 31 which is envisaged to pick up the pieces to be sorted at the storage area 30 and move them, in bulk, on a conveyor belt 32, which features a brush 33 provided to flatten the pieces, conveying them to a first rotating partition 34.
• the first partition 34 aligns the pieces and sends any surplus pieces to the storage area.
• the pieces transit on the conveyor belt 32, which carries them towards a second partition 37, which is envisaged to convey them towards a second conveyor belt 36, which transports them to a sandwich belt 38, which captures, accelerates, and accompanies the pieces, separating them one by one before they are released near the control unit 4.
• the elevator belt 31 is driven by an electric motor 31 a
• the conveyor belt 32 is driven by an electric motor 32a
• the second conveyor belt and the sandwich belt 38 are driven by a electric motor 39.
• the brush 33 is driven by an electric motor 33a, while the two partitions 34 and 37 are driven, respectively, by a motor 34a and a motor 37a.
• the storage area has a capacity of 50 litres, but there is a possibility of connecting it to an external supply unit to increase the capacity to up to approximately 2 10 litres.
• the operations of the external supply unit are managed by the storage area 30, which activates and/or stops the flow of pieces from the external supply unit, based on requirements.
• the pieces that fall off due to the action performed by the brush 33 are retrieved and collected in the storage area 30, ready to be placed back on the elevator belt 3 1 .
• the sandwich belt 38 features pulleys which permit the creation of the route desired for the belt, wherein a first pulley is fixed, while a second can flex slightly to allow dispersion of the belt speed and the distance between the belts to be altered to allow the passage of thicker pieces.
• the sandwich belt 38 has the task of retaining the pieces and conveying them to the point at which they free fall, vertically, into the control unit 4, as explained below.
• the machine 1 comprises a piece control unit 4 composed of an optical inspection unit consisting of a pair of video cameras 40a and 40b, of a linear type.
• the linear video camera is an image acquisition device whose sensor is formed of a single line of photosensitive elements (pixels). Therefore, acquisition is carried out line by line.
• Each scan line can be considered a kind of one-dimensional mapping of the brightness of the individual points of the observation line.
• Linear scanning generates a line whose Y axis shows the brightness of each point in levels of grey (0 to 250 levels).
• a sudden change in the grey level of a single point corresponds to a point in the outline of an object or, in any case, to the presence of a variation in colour or appearance. Detecting this variation, therefore, permits a high-precision measurement to be obtained, which is also permitted by the high resolution of the linear sensor. This way, it is possible to detect imperfections on any surface and therefore establish the condition of the individual pieces to be sorted.
• the video cameras 40a and 40b are housed one front of the other, as shown in Figure 2, and are positioned in a mutually opposite fashion, and have the same axis of alignment.
• the piece falling stage once the sandwich belt 38 has released the piece and dropped it, the piece is "captured" visually by the two video cameras 40a and 40b, which scan the condition of the surface thereof.
• Each video camera has a fixed setting, since it has good depth of field and, furthermore, it self-adjusts by adjusting the focus when the pieces are either very thin or very thick.
• each video camera is equipped with a lighting unit, respectively 41 a and 41 b, which is positioned in front of the respective video camera and the lighting units are responsible for lighting up one another.
• the two lighting units 41 a and 41 b have mutually different emission colours. This permits each lighting unit to operate with its own video camera without interfering with or disturbing the other. The presence of the two video cameras permits the viewing of both sides of each piece simultaneously.
• each lighting unit features a quadrangular external structure built with a metallic material, preferably aluminium, inside which there is a hollow seat containing thousands of LEDs, arranged around multiple circumferences and covering the entire surface of the hollow seat, which is protected by an opalescent screen endowed with a horizontally positioned rectangular slot which meets the operational need of the video camera.
• each lighting unit has a strip of LEDs to serve as rear lighting and as backlight for the video camera opposite.
• the lighting units are managed by management and control means, and there is an emitter, which is also managed by management and control means which send out the on/off command at intervals, with a strobe function.
• This intermittent light emission system means it is possible not to have the lighting unit always on, with a reduction in power consumption and consequent energy saving, and to have lower LED wear, which means less maintenance work required for replacement of the said LEDs. Furthermore, this makes it possible to have better video • camera vision and operations.
• control unit 4 is endowed with a planarity/thickness device located before the video cameras, comprising a laser sensing blade which is able to read the thickness and/or planar deformation of the piece and send the data read to the management and control means.
• control unit 4 comprises a conveyor unit 45 with a Y-shaped configuration envisaged to receive the individual pieces after the passage thereof in front of the video camera and to direct them towards either a first guide 46, which leads to a recipient for the compliant pieces, or to a second guide 47, which leads to a recipient for the rejected pieces.
• the conveyor features a blade which moves, either closing a guide and opening the passageway to the other guide or vice versa, depending on whether the piece is compliant or rejected.
• the blade's movement is managed by the management and control means, which send the order to accept or reject the piece based on the result of processing of the video camera viewing/detection data.
• the management and control means send out piece compliancy or rejection signals.
• the control unit 4 comprises, likewise, a first photocell, located between the lighting units, which signals the arrival and passage of the piece in order to permit the video camera to perform the scan and then send the detected image to the management and control means, the said image being then processed and the result of the examination drawn up, and a second photocell, located below the first, which receives information from the management and control means and governs acceptance or rej ection of the piece by moving the conveyor blade 45.
• the recipient of the compliant pieces is well separated from the recipient of the rejected pieces, so as to prevent the falling rejected pieces bouncing into the recipient for the compliant pieces.
• the recipient for the compliant pieces must be proportional so as to be able to contain a greater quantity of pieces.
• the recipient for the rejected pieces meanwhile, is normal in size because the rejects generally amount to approximately 5% of the pieces viewed, which means the said recipient has to house a limited number of pieces with respect to the number of compliant pieces.
• the machine includes a machine stop function which activates when a high percentage of rejects is encountered.
• the machine stops for example, ten consecutive pieces
• the control unit 4 includes a vision system which permits an operator to view on a screen that which the video cameras have detected.
• the screen is of the touchscreen variety so that the operator can easily enter all the necessary data and all the instructions required by the machine to perform all the actions constituting the sorting of the pieces. Furthermore, the operator can find diverse menus on the screen for setting the defects to be identified. In particular, it is possible to save everything as an article code and each batch which is sorted and viewed is saved by the management and control means. In particular, it is possible to generate statistical documents, which means even the size of the piece is checked. There is a visual and dimensional control process, with the preparation of statistical reports on checks carried out. Additionally, when checking for defects, there is also a defect size and type control process.
• the machine has Internet access for remote support and there is a USB port present in order to add programs or updates.
• the machine may have an external "lung", which makes it possible to send the pieces to another container with a greater capacity or to equipment for packaging or on for other processing.
• the "lung” may be an aspirator or a conveyor belt which transfers the pieces.
• the machine may envisage a peripheral piece control system for viewing the outer part of the piece, i.e. the piece joint section.
• the load-bearing structure 2 is provided with chamfered corners and wherever this is not possible, there are guards designed to prevent possible accidents. Furthermore, as shown in Figure 7 and in Figure 8, the load-bearing structure 2 is sealed by protective Plexiglas panels which protect the supply unit 3 and control unit 4, since there are moving pieces, such as the brush, the partitions and the various belts.
• the said protective sealing panels are antireflective to limit entry of external light, which could affect the internal visual conditions and proper video camera operation.
• edges of the upper covers of the load-bearing structure 2 also feature rubber strips so that when there are panels open, especially the upper ones, even if an operator should simply hit his head, the blow would be dampened and decidedly lessened.
• the machine is endowed with assistance photocells, with the result that when any of the protective panels of the structure are opened, the machine stops.
• the load-bearing structure envisages the presence of a signal light comprising a pair of lights (one red, the other green) in traffic light fashion, which signal, respectively, machine stoppage (with problems reported) and proper machine operation.
• the machine is powered by electric current, and within the load-bearing structure 2 there is a housing for all the electrical system components assigned to power the motors and the management and control means.
• both in units 3 and 4 and inside the load-bearing structure 2 there are no loose wires since the groups of electric wires are enclosed within appropriate housings.
• the computer and the monitor screen are housed at a height which is also accessible to a handicapped operator, who can manage the machine's operations and is also able to go so far as to load pieces in the storage area, even though Italian Law n. 626 envisages that such persons should not lift weights; furthermore, a disabled worker can also easily access the recipients for the rejected pieces and the compliant pieces in order to carry out checks.
• the management and control means actuate the motors that move the belts, the brush, and the partitions, which means the pieces are gradually taken up by the elevator belt, which carries them into position with the conveyor belt on which they are carried loose and positioned in a reciprocally overlapping fashion, aided by the air jet which facilitates their passage from one belt to another and then the conveyor belt moves them towards the brush, which flattens them and divides them, making the surplus pieces fall into the storage area from where they will be taken up once again by the elevator belt to be carried back to the conveyor belt.
• the first photocell intercepts the piece and signals the passage to each video camera, which means the corresponding lighting unit switches on, emitting light and permitting the scanning of the two sides of the piece.
• the management and control means process the data collected and send a piece compliance or rejection signal to the second photocell, which manages the acceptance or rejection of the piece by moving the conveyor blade.
• the operator will simply have to eliminate the rejected pieces and send the compliant pieces to a packaging machine or on for other processing.
• the operator may obtain a report stating the number of rejects, classified by individual criteria, and the number of compliant pieces and other information, and also reports containing information, statistics, tables of the results measured and the types of defects, etc.
• the signal light comes on with the red light, which signals the anomaly and a corresponding message appears on the screen
• the present invention achieves the aims set.
• the automatic machine for non-contact sorting according to the present invention offers notable piece viewing precision, with high resolution, working on both sides thereof simultaneously.
• the machine makes it possible to scan the pieces without any contact in a extremely fast manner and with improved productivity, unlike as happens with the machines according to the commonly known technique.
• the machine features a notable ease of setting, is structurally simple, extremely functional and extremely flexible, since it makes it possible to work, without problems, on small to considerable quantities of pieces.
• the machine is compact, of contained dimensions, and makes it possible to have an interesting level of energy savings, which turns into more contained production costs; it offers easy access and maintenance, a situation which makes it possible to perform component replacements in very little time, in the simplest of manners, and without the need to disassemble major parts of the machine, as occurred with those according to the commonly known technique.
• the machine in question permits optimal use, for example, in the pharmaceutical industry as it is easily cleanable and features no areas of accumulation of dust, since there are no sudden movements of the air, unlike as occurs with existing machines.
• the machine can be easily and readily usable even by personnel with a handicap, since both the management and control means and the monitor are extremely convenient and within reach and are at a height which renders them accessible, including therein by a person in wheelchair.
• the machine in question is structurally simple, extremely functional, safe and precise, and able to carry out the sorting of pieces in a quick and highly precise manner.
• the handling of the components remains constant over time, without deformation and with extremely limited wear. Furthermore, maintenance proves much easier and faster and can be performed with simple operations as the components subject to maintenance prove to be all easily accessible.
• a further but not final advantage of the present invention is that it proves remarkably easy to use and to manufacture and works well.

Landscapes

• Sorting Of Articles (AREA)
• Threshing Machine Elements (AREA)
• Discharge Of Articles From Conveyors (AREA)
• Branching, Merging, And Special Transfer Between Conveyors (AREA)

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Family Cites Families (4)

• 2012
  • 2012-11-14 IT IT000010A patent/ITMN20120010A1/it unknown
• 2013
  • 2013-11-07 WO PCT/IT2013/000307 patent/WO2014076719A2/en not_active Ceased
  • 2013-11-07 EP EP13828999.6A patent/EP2919922A2/de not_active Withdrawn

Non-Patent Citations (1)

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