A method for the treatment of meat pieces by hammering, and a machine for its execution

Abstract: A method and a machine for the treatment of meat pieces by hammering. The method consists in submitting the meat pieces during stopping stages in their progress along a deck (3) to one or more blows dealt by a succession of hammering members (12) whose surface provided to contact the meat piece has a plurality of pointed protrusions (15). The machine comprises a conveyor (1) providing a unitary feeding of meat pieces towards a stationary deck (3) with a plurality of pointed protrusions (4) distributed along its surface and the deck (3) having associated means providing a back-and-forth intermittent motion, in order to advance the meat pieces. Above said deck (3) a plurality of independent hammering members (12) associated to respective individual actuators is arranged operable to move downwards the respective one of said members (12) till hitting a meat piece at a stage at which the latter has stopped in its travel on said deck (3) and to return the corresponding hammering member (12) to an inactive position above said deck (3).

Description: The present invention concerns a method for the treatment of meat pieces, and in particular of boned or unboned meat pieces such as ham or shoulder meat and in general injected or boiled butchery products, or before their being injected (although it is as wiLl be seen applicable to uncured meats), based on submitting said pieces to hammering cycles which can be repeated several times and are of controlled strength, and it also concerns a machine for its execution. The treatment as per the invention has been conceived to facilitate thereby shortening the working times ulterior operations for the processing of the meat pieces at other stages, such as in particular the prematuring, macerating, maturing and boning operations. The method and machine as per the invention are applicable to: injected meat pieces at a stage before their maceration for example by massaging inside rotary drums such as those described in patents ES-A-81024457 (Gines Planas) and ES-A-8705198 (Metalquimia) or in similar units; unijected meat pieces at a stage before their being injected and macerated as indicated above; unboned products at a stage before their being injected and ulteriorly macerated and/or matured; meat pieces after slaughter and at the stiff stage known as of "rigor mortis", as an alternative and/or previously to their being prematured before an ulterior processing; unboned products before proceeding to their manual boning. Once having been injected with brine meat pieces are currently being transferred to a massaging container for example of the rotary type and with blades causing their dragging and ulterior falling and knocking in the case of the boned products, or to static containers (seasoning in brine) in case of unboned products that cannot be roughly massaged since this would damage the morphology of the piece, in both cases with no intermediary operation whatsoever. Also known in the prior art are machines for tendering previously injected and boned meat pieces such as those described in patents ES-A-8600988, US-A-4348787 and WO-A-9418842, which instead of said macerating rotary containers comprise rotary and in some cases resiliently loaded rollers with protrusions or teeth distributed on their surface, the meat pieces being caused to advance between said rollers whose action determines an energetic massaging of the products. These machines are of problematic control and not very versatile to adapt to different types of meat pieces to be treated. Also as a prior art it can be mentioned following patents: US-A-5.035.672 which discloses the preambles of claims 1 and 5, NL-A-8.800.786, FR-A-2.146.291, US-A-4.348.787, US-A-4.343.067 and US-A-3.744.089. The concept of the present invention consists in providing that said meat pieces to be processed pass before being treated in one of the above mentioned machines of the prior art or before the manual boning operation through a premassaging operation carried out by hammering the meat with hammering members with a plurality of pointed protrusions in order to obtain accelerated stretchings of the muscular fibres which increase the intramuscular spaces thereby facilitating the quick absorption of the injected ingredients and additives and thus accelerating the whole process of maturation and solubilization of the myofibrillar proteins. In the case of unboned products the tendering of the product and the stretching and separation of the fibres allow the product to hold more liquid when being ulteriorly injected thus favouring the ulterior maceration and increasing the postboiling performance. Furthermore, since the intermuscular connections can be weakened as a consequence of said hammering the method and the machine for its implementation can equally be used for tendering unboned meat pieces coming out of the slaughterhouse thereby facilitating their manual boning afterwards. As has been intimated, said hammering does also produce a tendering that is apt to shorten the prematuring stage that is necessary for the meat processing, this being because of the slackening, produced by said hammering, of the muscular stiffness known as "rigor mortis". It is manifest that in all cases a shortening of the ulterior processing times is obtained as regards the further processing of the meat products at the prematuring, the massaging and/or the maturing or the boning stages, an increase of the performances (more liquid retention) being also obtained in some cases. The method as per the invention comprises the following stages: feeding the previously injected or not injected meat pieces on a longitudinal deck; intermittently moving the meat pieces along said longitudinal deck; during the stopping stages in their progress along said deck, submitting the meat pieces to one or more blows dealt by a succession of hammering members acting by way of hammers whose surface provided to contact the meat piece does advantageously have a plurality of pointed protrusions; adjusting the strength with which each hammering member or hammer is to actuate, and selecting the number of hammers intervening during the treatment and the number of blows to be dealt by each of said hammers depending on the characteristics of the meat piece to be treated; thereby bringing about a tendering of said products and an accelerated stretching of their muscular fibres and a weakening of the intermuscular connections, as has been said before. In a preferred embodiment of the invention the pieces are fed one by one on said longitudinal deck whose surface does advantageously have a plurality of pointed protrusions. Said hammering is as well preferentially carried out in an individual way on each piece. The characteristics of the invention and in particular those of the machine to implement the described method will become more apparent when reading the following detailed description of an example of an embodiment shown in the enclosed drawings, wherein: figure 1 is an elevational view of the whole proposed machine detailing its main component members; figure 2 shows in plan-view the conveyor for feeding the meat pieces one by one and the longitudinal deck on which the meat pieces to be treated advance; figures 3 and 4 show in a side elevation and in a plan-view respectively the configuration of a length of one of the sliding bars with a toothed profile for the intermittent conveyance of the meat pieces; figure 5 is a cross-sectional view of said machine along section line V-V in figure 1; figure 6 is a partial detail, on an enlarged scale, of the structure with multiple pointed protrusions of one of the plates that are removably associated to one of the hammering members, figures 7 and 8 show the hammering blocks raised in a first position for cleaning, and in a second position, oriented upwards, for cancelling their actuation in case of their being actuated by an actuating cylinder, and figure 9 shows an enlarged detail of the means provided to raise said hammering blocks. According to these figures the machine for the treatment of meat pieces comprises a conveyor 1 with flights 2 dividing it into sectors and which with the aid of inclined plates 33 and 34 provide a unitary feeding of meat pieces towards a stationary, longitudinal deck 3 having a plurality of pointed protrusions 4 which are for example tetrahedral or in general pyramidal (see figures 2 and 5) and are in general evenly distributed along the surface of said deck 3. In the exemplified embodiment said deck 3 is formed by an array of oblong, longitudinal plates 5 by way of strips mounted side to side on a bearing base 6 and fastened to it with their lower surface by means of fastening screws, the exposed surface of said longitudinal plates 5 providing said pointed protrusions 4 of stationary deck 3. Between said plates 5 with protrusions 4 are defined rectilinear slits 26 in which are arranged, in a sliding assembly, longitudinal bars 7 having an upper profile with an inclined sawtooth shape 8 with the points of said sawteeth 8 oriented in feeding direction, said upper profile slightly protruding above said protrusions 4 of the stationary deck 3, said bars being attached at one of their ends to an inverted U-shaped profile member 9 by way of a cross member, said profile member 9 connecting the bars with each other being linked through a sliding member 37 to a leverage 10 to which is linked to the rod of a double-action, fluid-operated actuating cylinder 11 situated below and in the vicinity of the outfeed end of deck 3 and cperable to shift said toothed bars 7 in a back-and-forth motion. Under the deck 3 a receiving tray 38 has been provided. There is above said deck 3 an aligned array of independent hammering members 12 associated to respective hydraulic cylinders 13 (one for each hammering member 12, as shown in figure 1) for purposes of their unitary actuation, each of said cylinders being operable to move downwards the respective one of said members 12 till the latter hits by way of a hammer the meat piece at a stage at which the latter has stopped in its travel on said deck 3, and to return after said blow the corresponding hammering member 12 to an inactive position above said deck 3. For replacement purposes removably fastened to its lower surface provided to strikingly contact the meat pieces each hammering member 12 includes a plate 14 provided with a plurality of pointed protrusions 15 whose distribution and number are individually chosen for each of the plates (see figure 6) for the purpose of singularizing their actuation. As can be seen in figure 5, each of said hammering members 12 is connected at two distal ends to an upper portion of each of two upright bars 16, 17 properly guided in bushes 18, 18a, 19, 19a attached to the arms of U-shaped members 31 which are solid with the upper portion of the machine frame, said bars 16, 17 being operable to move upwards and downwards because of having their lower ends mutually connected by a V-shaped bridge member 20 with a reinforcing tiebar 32, said bridge member being linked to rod 13a of a fluid-operated cylinder 13 of vertical travel which is mounted in a hinged connection and suspended from the central portion of said U-shaped member 31. In order to cushion the effects of each blow bushings 29, 30 of resilient material have been arranged around the hinge pins of the hinged connections of said cylinder 13 to said central portion of the U-shaped member 31 and to the vertex of the V-shaped member 20. It has been foreseen to adjust or graduate the strength of each of the hammering members 12, and to select by means of a control unit known in itself and in a programmed way the number of hammering members 12 to be active in each case and the number of blows to be dealt by each of them to a meat piece on the basis of the particular characteristics of the latter. The motor of a hydraulic pump for the supply of pressurized fluid to the different above-mentioned cylinders has been indicated with numeral 35. And electrical motor-reducer for driving said conveyor 1 has been indicated with numeral 36. In order to set apart, in sequence the hammering blocks 12 as per the figures 6 and 7, said blocks have been provided with two arms 39 attached by one end to a rotatable bushes 40 which can be blocked by locking pins 41 longitudinally shiftable by a nut 42. Thanks to everything explained above, with the described method and machine different hammerings can be progressively produced on each meat piece at each stopping stage till said piece reaches the outfeed end of deck 3 to be transferred to the subsequent operation, thereby causing in said meat piece a tendering and weakening of the intermuscular connections in the case of the unboned products, or a quick stretching of the muscular fibres in case of injected pieces thereby leaving free intramuscular spaces and thus facilitating the encroachment of ingredients and additives and hence allowing to shorten the ulterior processes of maceration or of another type, as has been indicated.

Claims: A method for the treatment of meat pieces by hammering, in particular of boned or unboned meat pieces, including: feeding the meat pieces on a longitudinal deck (3); and moving in advance the meat pieces along said longitudinal deck (3) with stopping stages; characterized in that it further comprises following steps: during said stopping stages in their progress along said deck (3), submitting the meat pieces to one or more blows dealt by a succession of hammering members (12) with a plurality of pointed protrusions; and adjusting the strength with which each hammering member (12) or hammer is to actuate, and selecting the number of hammers intervening during the treatment and the number of blows to be dealt by each of said hammers depending on the characteristics of the meat piece to be treated; thereby bringing about a tendering of said products, an accelerated stretching of their muscular fibres, increasing the intramuscular spaces and producing a weakening of the intermuscular connections. Method as per claim 1, characterized in that the pieces are fed one by one on said deck (3) and the hammering is as well carried out in an individual way on each piece during the stopping stages in their progress along said deck (3). Method as per claim 1, characterized in that the surface of said longitudinal deck (3) includes a plurality of pointed protrusions (4) and the face of said hammering members (12) provided to contact the meat piece also has a plurality of pointed protrusions (15). Method as per claim 1, characterized in that the unboned products are previously injected with brine or another additive, fat ,binder or similar product. Machine for the treatment of meat pieces by hammering which includes: a conveyor (1) providing a unitary feeding of meat pieces towards a stationary, longitudinal deck (3); and means associated to said longitudinal deck (3) to advance said meat pieces with stopping stages; characterized in that it comprises a plurality of pointed protrusions (4) distributed along the surface of said deck (3); above said deck (3) a plurality of independent aligned hammering members (12) associated to respective individual actuators being operable to move downwards the respective one of said members (12) till hitting a meat piece at a stage at which the latter has stopped in its travel on said deck (3) and to return after said blow, the corresponding hammering member (12) to an inactive position above said deck (3); a plurality of pointed protrusions (15) on the face of said hammering members (12) provided to contact said meat pieces. Machine, as per the claim 5, characterized in that said deck (3) is formed by an array of oblong, longitudinal plates (5) by way of strips mounted side to side on a bearing base (6) and fastened to it with their lower surface by means of fastening elements, the exposed surface of said longitudinal plates (5) providing said pointed protrusions (4) of said stationary deck (3) and in that between said plates (5) with protrusions (4) there are rectilinear slits (26) in which are arranged, in a sliding assembly, longitudinal bars (7) having an upper profile with an inclined sawtooth shape (8) with the points of said sawteeth (8) oriented in feeding direction, said upper profile slightly protruding above said protrusions (4) of said stationary deck (3), said bars being attached at one of their ends to an inverted U-shaped profile member (9) by way of a cross member and said profile member (9) being linked through a sliding member (37) to a leverage (10) to which is linked the rod of a fluid-operated actuating cylinder (11) and operable to shift said toothed bars (7) in a back-and-forth motion. Machine as per claim 5, characterized in that removably fastened to its lower surface provided to strikingly contact the meat pieces each hammering member (12) includes a removable plate (14) provided with a plurality of pointed protrusions (15) whose distribution shape and number are individually chosen for each of the plates (14). Machine as per claim 5, characterized in that each of said hammering members 12 is connected at two distal ends to an upper portion of each of two upright bars (16, 17) properly guided in bushes (18, 18a, 19, 19a) attached to the arms of U-shaped members (31) which are solid with an upper portion of the machine frame, said bars (16, 17) being operable to move upwards and downwards because of having their lower ends mutually connected by a V-shaped bridge member (20) with a reinforcing tiebar (32), said bridge member being linked to a rod (13a) of a fluid-operated cylinder (13) of vertical travel which is mounted in a hinged connection and suspended from the central portion of said U-shaped member (31). Machine, as per the claim 5, characterized in that in order to cushion the effects of each blow bushings (29, 30) of resilient material have been arranged around the hinge pins of the hinged connections of said cylinder (13) to said central portion of said U-shaped member (31) and to a vertex of said V-shaped member (20). Machine, as per the claim 5, characterized in that in order to set apart, in sequence, the hammering members (12), said members have been provided with two arms (39) attached by one end to a rotatable bushing (40) which can be blocked by locking pins (41) longitudinally shiftable by a nut (42).

Inventors: LAGARES COROMINAS NARCISO, LAGARES COROMINAS, NARCISO
Applicants: METALQUIMIA SA, METALQUIMIA, S.A.
Application year: 1996
Main classification: A22C9
IPC codes: A22C9