WO2005099430A1

WO2005099430A1 - Hinged transmission mechanism for pantographic support of argricultural machines and implements

Info

Publication number: WO2005099430A1
Application number: PCT/BR2005/000058
Authority: WO
Inventors: Roberto Otaviano Rossato; Valdir Baumgardt; Natalino Cordeiro Dos Santos
Original assignee: Semeato S/A Indústria E Comércio
Priority date: 2004-04-16
Filing date: 2005-04-15
Publication date: 2005-10-27
Also published as: BRPI0401335B1; BRPI0401335A; BRPI0401335C1

Abstract

The present invention refers to a hinged transmission mechanism for pantographic support (42,44) of agricultural machines and implements (100) for which permits that the rotation from the motion axis (A) can be regular and continuously transmitted in order to drive a seed feeder in a seeding line in a fashion free from oscillations caused by the pantographic support arms when the seeding is performed in a non regular soil.

Description

HINGED TRANSMISSION MECHANISM FOR PANTOGRAPHIC SUPPORT OF ARGRICULTURAL MACHINES AND IMPLEMENTS The present invention refers to a hinged transmission mechanism for pantographic support of agricultural machines and implements for which permits that the rotation from the motion axis can be regular and continuously transmitted in order to drive a seed feeder in a seeding line in a fashion free from oscillations caused by the pantographic support arms when the seeding is performed in a non regular soil. SUMMARY OF THE INVENTION The present invention basically comprises an axis set having conical gears positioned in the edge for receive motion from a motion axis an this is assembled in a such fashion that a reciprocal hinged movement is provided and it makes possible that vertical movement of hinged pantographic arms can be performed having no movement relation to the final rotation which is transmitted for start the seed feeder in the feeding line of a agricultural machine and/or implement. BACKGROUND OF THE INVENTION It is very known in the art that transmission means have remarked function in feeding machine, since through this means the rotation is passed from the rotor to the feeders, and, in this case an uniform rotation of the transmission system axis is a crucial step when a perfect soil seed distribution is achieved. However, the great limitation in seeding operations comprises a non regular seed distribution per linear meter in conventional transmission systems. As known in the art, conventional seeding operations involve underground preparation, soil scratching, soil leveling procedures, and many other operations for provide a regular seeding soil; however, as the direct seeding technique has been adopted, preliminary operations has been abandoned due to a conserved soil having vegetal mass content became to be necessary but it contributed to a non regular seeding soil surface; therefore, the seeding machines were forced to have other agricultural functions other than the traditional ones, e.g., vegetal mass cutting, seed hole digging and a perfect distribution of such products independently from the size of the regularity feature of the seeding soil. There is very known in the art several types of transmission mechanisms, for example, the mechanism described in the Brazilian patent PI8705074-9 where a transmission mechanism comprising an axis and crown pinion is mounted over a tubular type distribution line which is articulated to a machine chassis, such transmission mechanism fails when soil level curves are to be overcame because such kind of mechanisms do not have vertical motion and damage in feed distribution process is commonly verified. The above mentioned transmission means, illustrated in Figures 1A to 1C, presents other problem: even such problem is not directly observed it strongly interacts in the seed distribution, since the seeding line, when a soil curve is to be overcame, describes a vertical movement forcing the pinion (P') in the transmission axis (E') to perform an orbital movement over the pinion (P) coupled in the motion axis (E) and therefore an instant acceleration in the transmission axis rotation (E) of the line (E) is caused and, in consequence, an axis difference rotation is provided interfering in the seeding rate per linear meter; thus the amount of seed originally set in the equipment is changed and the crop production. As the art advances, other support frames have been developed in order to be applied in seeding machines having hinged arms (pantographic system), which comprise high strength structures and able to perform the seeding operation, even in not favorable soil condition (non regular soil) such as holes, plates, or very inclined soils; in these supports, the transmission means comprise streams (C) and gears (P, P') extending from the motion axis (E) to the dosing axis (E"), as illustrated in the Figures 2A, to 2C, selected from the patent document EP0199926 and EP0140701 ; however, in this type of invention a not continuous transmission caused by the vertical movement of the seeding line is still a problem, i.e., when the pantographic structure oscillate upwardly, when a level curve is overcame, a change of the position of part of the gear set (P) in the motion axis (E) in relation to the stream (C) occurs and thus, the displaced gear (P") in the dosing axis (E") has its movement has an increase of angular movement, changing the dosing disc rotation; similarly, when the line moves downwardly, a rotation retard of the dosing axis is verified, and consequently, instant stop situations of the dosing disc occurs and it can cause the stopping of all transmission system, particularly when the stream is not regularly installed or is badly oiled; it can cause component destruction, such as gear tooth or stream extenders. Another solution is described in the patent US4359952 and it is schematically illustrated on Figures 3A and 3C in which a two stroke transmission (called point to point) is demonstrated and comprises a structural arrangement, employing two streams having and intermediary gear placed between the motion gear and the dosing gear, and it provides a significant improvement of the transmission, the bumping effect and rotation changes are reduced, however, such arrangement is unable to completely solve the problem since the gear coupled to the dosing axis is still receiving motion influence from the stream due to the pantographic arm. Another solution is described in the Brazilian patent document MU7501973-6 comprise a cardan axis connecting the motion axis of the machine to the dosing axis, however, this technique is problematic because some components are frequently disabled causing gear damage including general disabling of the transmission components and an elevated level of noise is also caused; the acceleration/retard problem is still unsolved. Another solution comprised a set of axis and a cross shaped (90°) transmission box having an endless driving means and helical gear having a sliding sleeve for varying the length of the axis, in order to follow the movement of the dosing line in relation to the non regular soil; however, this arrangement is practically unable to solve the rotation variation problem which is transmitted to the dosing axis when the seeding lines vary; furthermore, an excessive consumption of internal components in the transmission box occurs, due to the constant movement of the dosing axis over the sliding sleeve, and it can hold vegetal residues in the dosing axis and the axis movement is stopped; consequently, distribution failure occurs and cause a constant maintenance operation.

SUMMARY OF THE INVENTION The present invention comprises a pantographic base in the implement chassis and having a fixing set of the upper-rear and lower-rear hinges of the pantographic means; in one of such pantographic means hinges an axis is positioned trespassing the hinge by this center, transmitting the movement from the implement wheels to the transmission box having conical gears 90° reciprocal position, such box transmits movement to the axis which is extended to the rear pantographic hinge, where another conical gear box is positioned for provide a movement transmission in the seed distributor at the seeding line. The rear transmission box comprises three conical gears in which the rear pair actuate having the corresponding hinging center in the same position of the rotation center of the pantographic bar, while the third gear is fixed in the same set of the seed distribution box, the digger means and the connecting vertical bars of the pantographic bars. When the seeding line in operation move upwards and/or downwards, such rear pair of gears will rotate around the rotation center of the pantographic means bar, therefore the third gear having also its rotation center coinciding to the pantographic bar is kept connected and such gear will transmit rotation for seed distribution. As is known in the art, during the hinging movement of a seeding line in relation to the implement chassis, the motor pinion of the first transmission axis tend to be displaced in some degrees over the motion axis pinion changing the position of its rotation center, causing rotation variation, however, it is verified that when a set of pinions is placed in the opposite edge of such first transmission axis and the adjacent edge of an intermediary transmission axis, inversely to the position of such motion pinions and motor, it is possible to compensate the changing of the rotation center and cancel the rotation variation, since as the first set of pinions is positioned in an upper position, the second set of pinions descend and the rotation of both pinion sets will be kept constant, therefore no interference is seen in the seed distribution. It is a goal of the present invention provide a hinged transmission for compensate vertical oscillation, which is employed in seeding machines having seeding lines hinged to the chassis of the machine by means of pantographic structures for solve the problems of rotation transmission interference caused by non regular soil. The transmission system of the present invention provides a connection point which is common to a hinging point of the pantographic arms; the connection between the transmission parts is placed in a such manner that a rotation compensation effect is provided in the transmission rate due to the pinions mounted in the edge of the transmission axis; such pinions are placed in 90° angles, but in opposite sides, in a such manner that when the seeding line is vertically moved, the transmission axis is able to follow the movement of the pantographic arms in the same grade of the biasing level of the soil. The movement of the transmission axis correspond to a determined spin angle of the pinion moved over the pinion motor, preventing that an orbital movement when a translation movement of the movement pinion in relation to the pinion motor, due to the vertical oscillation of the pantographic line, such movement generates a rotation fraction which will be transmitted through a pinion placed in the opposite edge of this first transmission axis, to a pinion which is placed in one of the edges of an intermediary axis, which is perpendicularly positioned in relation to the pantographic line, such intermediary axis also comprises another pinion positioned in its opposite edge which will rotate another pinion positioned in one of the edges of the second transmission axis, which in this time will be rotated in an opposite wise of the first transmission axis, compensating any other delay caused by the vertical oscillation of the pantographic line and therefore, the second transmission axis become to transmit a constant rotation of the dosing axis. Another objective of the present invention is to provide a hinged transmission having particular application in seeding apparatuses having hinged seeding lines in the chassis by means of the pantographic arms, where a soil crusher and a seed dosing means, the seed distributor is driven by means of a first set of pinions which are installed in a fixed position of the pantographic means hinge and it is connected to a second set of pinions which are installed, inversely, in a mobile or intermediary point of the hinging line, from which a second transmission axis is projected and starts the axis of the seed distributor. Another objective of the present invention is to provide a transmission which can be positioned in the upper bar and/or lower bar of the pantographic set making an ample use of the invention. Another objective of the present invention comprise a pantographic system in which a support bar of the transmission means is provided in a closed fashion in order to avoid the contact of inner components of the transmission and the outer environment, protecting of the axis and pinion sets. Another objective of the present invention comprise a coil based traction set which will be fixed in the pantographic bars and have adjustment for provide diggers with more or less penetration feature. The present invention provide improved features such as apply the conical gear axis for transmit rotation, avoiding streams and stretchers for a more precise distribution and the use of a frontal hinge box made of three conical gears, facilitating the use of the pantographic structure and permitting that the angle of the diggers is the same independently of the hinged movement of the seed line, keeping the seed distribution box in a vertical position, and making pantographic means is able to offer more fastness and stability features to the seeding line. DESCRIPTION OF THE DRAWINGS Figures 1A to 1C - Illustrate schematic frontal, upper and hinged views of the transmission system of the art which employs pinions; Figures 2A to 2C - Illustrate schematic frontal, superior and hinged views of a transmission system of the art employing streams and gears; Figures 3A to 3C - Illustrate frontal, upper and hinged schematic views of a point to point transmission system of the art ; Figure 4 - Illustrates a perspective view of a line employing a hinged transmission mechanism applied to a pantographic support; Figure 5 - Illustrate a side view of a line which employs a hinged transmission mechanism applied to a pantographic support; Figure 6 - Illustrate an upper view of a line which employs a hinged transmission mechanism applied to a pantographic support; Figure 7 - Illustrate a side view of the hinged transmission mechanism applied to a pantographic support; Figure 8 - Illustrate an upper view of the hinged transmission mechanism associated to a seed dosing means; Figure 9 - Illustrate a perspective view of a line employing a seed dosing means in vertical oscillation; Figure 1 0 - Illustrate a perspective view of the hinged transmission mechanism applied to a pantographic support, and showing the vertical oscillation of the pantographic supports; Figure 1 1 - Illustrate a perspective view of the hinged transmission mechanism applied to a pantographic support, showing the vertical oscillations; Figures 12A - 12D - Illustrate perspective views of the hinged transmission mechanism in different levels of vertical oscillations; Figures 13A - 13D - Illustrate lateral, upper and oversized detailed views of a first embodiment of the hinged transmission mechanism applied to a pantographic support; Figure 14 - Illustrate a perspective view of a second embodiment of the hinged transmission mechanism applied to a pantographic support; Figure 15 - Illustrate a perspective view of a second embodiment of the hinged transmission mechanism applied to a pantographic support, showing detail of a example of transmission axis of a dosing means installed in the lower bar of the pantographic set. DETAILED DESCRIPTION OF THE INVENTION The present invention refers to a hinged transmission mechanism applied to a pantographic support of agricultural machines and implements for compensate vertical movements of the seeding line, the hinged transmission mechanism is fixed in a chassis bar (20) of the agricultural implement by means of a pair of brackets (21), from which a extension arm (40) is projected. In Figures 4 to 6 just one hinging line is provided, but in some embodiments more than one lines fixed in the chassis bar and forming a support which is common to all pantographic arms. The present invention comprises a pantographic structure, formed from an upper arm (42) a lower arm (44) fixed in the extension arm (40) by means of an upper pin (45) and lower bearing (47), and to a block (60) of the line by means of an upper pin (41) and a lower bearing (43), such line block is fitted to the chassis (80) of the line which houses a seed dosing means (90) and a digger (100) extending from the chassis to the extension arm the hinged transmission which will promote a rotation transfer of the motion axis (A) which is common to all lines and is transversally positioned over the lower region of the extension arm (40) trespassing the lower bearings which serve for support the pantographic lower arm and in which opposite edge is kept, by the lower bearings of the line block, an intermediary axis for transmission (B). In Figures 7 and 8 details of components/parts of the hinged transmission system extending from the motion axis (A) being common to the lines, until the dosing means (90), each line has a particular hinged transmission and rotation is transmitted from the implement wheels in proportional operation speed rate by means of a spin motion of a first pinion (2) installed in such motion axis, which transmits rotation to a first transmission axis (C), preferably, in relation of 1 :1 , respectively, to the first and second pinions of the motion axis and the first transmission axis and the first transmission axis, in this turn, transmits rotation to a third pinion (6) connected to a fourth pinion (8) which transmits rotation to an intermediary axis (B), which is rotated in the same spin wise of such motion axis, the intermediary axis is joined connected to a fifth pinion (9) which has no gear relation with the third and fourth pinions of respectively the first transmission axis and of the intermediary transmission axis, being gear connected to a sixth pinion fixed in a second transmission axis (D); due to the inversed position of the first and fourth pinions, the second transmission axis is rotated in the same "spin-wise" of the first transmission axis, transmitting rotation to the transmission box (92) which starts the dosing means. Therefore, the transmission line comprises a motion axis (A) \n which the first transmission axis (C) is gear connected by means of, respectively, a first (2) and second (4) pinions being perpendicularly positioned one in relation to the other, thus, the first pinion motor and the second rotated pinion, the position of the firs pair of pinions is inversed in relation to the second pair of pinions, which is formed by the third (6) and fourth (8) pinions which are fixed in the first transmission axis and in the intermediary transmission axis (B), respectively; the third and fourth pinions are also perpendicularly positioned one in relation to the other; the third pinion motor and the fourth rotated pinion; therefore, as exemplified in figures 7 and 8, the first pinion motor of the motion axis is placed in the left side while the fourth rotated pinion of the intermediary axis is placed in the right side. The arrangement, and due to the transmission relation comprises 1 :1 , results in a compensation effect of the rotation variation provided by the vertical movement of the line following the non regular soil. According to figure 9, the lower arm (44) of the extender (40) is trespasses by the motion axis (A), which will start all lines, the assembling of the motion axis at the center of the hinging point of the lower arm, trespassing the bearing (47), being mounted in this point of the first pinion (2), which is gear connected to the second pinion (4), the first transmission axis (C), forming the first pair of pinions, placed between the walls of the lower arm, forming the fix transmission point which performs no vertical movement, in the other edge of the first transmission axis the third pinion (6) is provided gear connected in the fourth pinion (8) joined to the intermediary transmission axis (B), trespassing the bearing (43), forming the second pair of pinions placed between the lower arm walls, being also assembled in the intermediary transmission axis a fifth pinion (9) gear connected to a sixth pinion (10), fixed in one of the edges of the second transmission axis (D) the coupling of such third and fourth and the fifth and sixth pinions form a mobile transmission point, where vertical movement of the hinged pantographic system is performed according to the soil profile. Figure 10 illustrate a tube (20) of the implement chassis when sequentially assembled, seeding lines, which simulate a very common crop condition where the direct seeding system is used and different line hinging levels corresponding to non regular soil profiles, exemplified from external lines. A gradual variation of vertical oscillations makes the first transmission axis (C), placed in the inside the lower arm (44) to perform an independent hinging movement in each line and in relation to the motion axis (A) which is kept static, respectively configuring a mobile point and the fixed point of the hinged transmission, the oscillation of the first transmission axis in relation to the motion axis is followed by the intermediary axis (B) e by the second transmission axis (D), but its relations are not affected by the vertical displacement of the mobile point in relation of such fix point of the hinged transmission. Figure 11 illustrate the gearing of the motion axis (A) in relation to the first transmission axis (C), configuring the fix point of the hinged transmission and the gearing of the first transmission axis in relation to the intermediary axis (B) configuring the mobile point of the hinged transmission and also the gearing of the intermediary axis in relation to the second transmission axis (D), configuring another mobile point of the hinged transmission, the rotation acceleration in the first transmission axis, in view of the vertical displacement in relation to the motion axis, will make the second pinion (4), fixed in the first transmission axis, to spin some degrees in relation to the first pinion (2), fixed in the motion axis which keeps a constant rotation; the rotation acceleration of the first transmission axis is taken by the gear means of the mobile points, forming the gear means of the third pinion (6), fixed in the first transmission axis, in the fourth pinion (8), fixed in the intermediary axis, and the fifth pinion (9) fixed in the intermediary axis, the sixth pinion (10) also fixed in the second transmission axis which will make the second transmission axis to transmit to the dosing means a constant rotation. Figures 12A to 12D are particular cases of the hinged transmission system behavior, from the descendent movement to the ascendant movement, exemplified, by means of an indication point ( ), the initial position of the first pinion (2) fixed in the motion axis (a), which vary in position in relation to the second pinion (4) fixed in the first transmission axis due to the orbital displacement of the second pinion when the line is in the vertical oscillation. Figure 13A illustrate a side view of the an embodiment of the present hinged transmission, by means of which a chassis bar (20') fixed by brackets (21') is seen; in view of the support (40') of the upper pantographic arms (42') and (44') connected in the other edge of the chassis (80') of the line, which is supports the dosing means (90') a previous determined amount of seed falls between the soil crushers (100') which is responsible for hole aperture and seed insertion and a further application of the soil compacting means (400), in this invention, the transmission axis (C) is installed inside the lower arm (42') for prevent that the components of the transmission system be damaged by contact the ground or any other damaging agent. Figures 13B and 13D illustrate a first variation of the hinged transmission, where the motion axis (A') counter clockwise spins in which the first pinion (21') gear connected in the second pinion (41) fixed in the transmission axis (C1) which spins clockwise; the opposite edge of the first transmission axis is coupled to a third pinion (42) which is gear connected to a fourth pinion (43), joined to a first intermediary axis (A1) which is parallel to the motion axis, and is rotated in the same spin-wise. The first intermediary axis is coupled to a fifth pinion (2'), coupled in the sixth pinion (4'), fixed in the second transmission axis (C), which rotates in the same spin- wise of the first transmission axis, and in which opposed edge is coupled the seventh pinion (6'). Such pinion (6') is gear connected in an eighth pinion(δ') fixed in the second intermediary axis (B') which rotates in the same spin-wise of the motion axis and the first intermediary axis and the second intermediary axis is coupled in a ninth pinion (9') which is gear connected in the tenth pinion (10') fixed in the third transmission axis (D') rotating counter spin-wise of the first and second transmission axis and in the opposite edge of such third transmission axis, the eleventh pinion (11), which is gear connected in the transmission axis, the eleventh pinion (11) which is gear connected to the twelfth pinion (12), causes clockwise motion, the 13^th pinion (13) which rotates the crown (14) of the dosing means. In this embodiment, for compensate the spin vertical motion of the arms (42') and (44') of the pantographic means, the transmission relation between the pinions shall comprise 1 :1 and the positioning of the fifth pinion (2'), fixed in the first intermediary axis (A1) shall be inversed in relation to the eighth (8') fixed in the second intermediary means (B'), in order to the rotation of the sixth pinion (4') in the fixed point of the transmission which is caused by the vertical movement, ascendant and descendent, of the second transmission axis (C) in relation to the first intermediary axis (A1), be compensated by the rotation of the seventh pinion (6') in the mobile point of the transmission, by means of the vertical movement corresponding to the second transmission axis (C) in relation to the second intermediary axis (B'). Figures 14 and 15 illustrate a second variation of the hinged transmission where the lower and upper pantographic arms (52) and (54) are narrowed; the lower pantographic arm is totally closed in order to not permit the direct contact of the operator or the contact with parts of crops in the transmission axis

Claims

CLAIMS: 1 - Hinged transmission mechanism applied to a pantographic support of agricultural machines and implements characterized in that comprises a hinged transmission extending from the chassis of the implement to the extender and transferring rotation of the motion axis (A) which is common to all lines and is transversally positioned downwards the extender, trespassing its lower bearings which support the lower arm of the pantographic means and in which opposite edge is kept an intermediary axis (B) by means of such bearings, the rotation of the motion axis is transmitted by the wheels of the implements and being proportional to the operational speed provided by a first pinion (2) spin installed in such motion axis which is gear connected in a second pinion (4) through which a rotation to a first transmission axis (C); such first transmission axis transmits rotation to a fourth pinion (8) which transmits rotation to an intermediary axis (B) and the intermediary axis is joined to a fifth pinion (9), which is gear connected to a sixth pinion (10) fixed to a second transmission axis (D) transmitting rotation to a transmission box (92) which starts the seed dosing means. 2 - Mechanism, according to claim 1 , characterized in that comprises a relation between the first and second pinions of the motion axis and the first transmission axis, respectively, of 1 :1. 3 - Mechanism as in claim 1 , characterized in that the intermediary axis is rotated in the same spin-wise of the motion axis. 4 - Mechanism, as in claim 1 , characterized in that the fifth pinion has no gearing relation with the third and fourth pinions of the first transmission axis and the intermediary transmission axis, respectively. 5 - Mechanism, as in claim 1 , characterized in that the second transmission axis is rotated in the same spin-wise of the first transmission axis. 6 - Mechanism, as in claim 1 , characterized in that the first and second pinion is perpendicularly positioned one in relation to the other. 7 - Mechanism, as in claim 1 , characterized in that the first is a pinion motor and the second pinion is the rotated pinion. 8 - Mechanism, as in claim 1, characterized in that the position of the first pair of pinions is inversed in relation to a second pair of pinions. 9 - Mechanism, as in claim 1, characterized in that the third and fourth pinions are also perpendicularly positioned one in relation to the other. 10 - Mechanism, as in claim 1, characterized in that the third pinion is a motor pinion and the fourth is a rotated pinion. 11 - Mechanism, as in claim 1 , characterized in that the rotation variation compensation is provided by means of a vertical line movement following the soil profile. 12 - Mechanism, as in claim 1, characterized in that the assembling of the motion axis is made in the center of the hinging point of the lower pantographic arm, trespassing the bearing (47) and being mounted in this point a first pair of pinions placed between the lower arm walls, forming a fixed transmission point. 13 - Mechanism, as in claim 1 , characterized in that the fixed point of the transmission do not perform any vertical movement. 14 - Mechanism, as in claim 1 , characterized in that the intermediary axis assembling is made in the center of the hinging point of the lower pantographic arm, trespassing the bearing (43) and being mounted in this point a second pair of pinions placed between the lower arm walls. 15 - Mechanism, as in claim 1 , characterized in that the coupling of the third and fourth pinions and the sixth and seventh pinions form a mobile transmission point. 16 - Mechanism, as in claim 1 , characterized in that the mobile point of the transmission performs vertical movements of the hinged transmission, according to the soil profile. 17 - Mechanism, as in claim 1 , characterized in that the vertical oscillations of the lines force the first transmission axis to hinge, independently of each line and in relation to the motion axis, which is kept stopped. 18 - Mechanism, as in claim 1, characterized in that the oscillation of the first motion axis is followed by the intermediary axis and by the second transmission axis, without vertical displacement interference of the mobile point in relation to the fixed point of the hinged transmission. 19 - Mechanism, as in claim 1, characterized in that the rotation generated in the first transmission axis, in view of the vertical displacement in relation to the motion axis is taken by the gearing of the mobile point formed by the third pinion gearing, fixed in the first transmission axis, In the fourth pinion, in the intermediary axis, by the fifth pinion gearing, fixed in the intermediary axis, in the sixth pinion (10), fixed in the second transmission, and due to the particular position of such components, the second transmission axis transmits to the dosing means a constant rotation. 20 - Hinged transmission mechanism applied to a pantographic support in agricultural machines and implements characterized in that a first embodiment (A') counter clockwise spins in which the first pinion (21') gear connected in the second pinion (41) fixed in the transmission axis (C1) which spins clockwise; the opposite edge of the first transmission axis is coupled to a third pinion (42) which is gear connected to a fourth pinion (43), joined to a first intermediary axis (A1) which is parallel to the motion axis, and is rotated in the same spin-wise, the first intermediary axis is coupled to a fifth pinion (2^J), coupled in the sixth pinion (4'), fixed in the second transmission axis (C), which rotates in the same spin- wise of the first transmission axis, and in which opposed edge is coupled the seventh pinion (6'), such pinion (6') is gear connected in an eighth pinion(δ') fixed in the second intermediary axis (B') which rotates in the same spin-wise of the motion axis and the first intermediary axis and the second intermediary axis is coupled in a ninth pinion (9') which is gear connected in the tenth pinion (10') fixed in the third transmission axis (D') rotating counter spin-wise of the first and second transmission axis and in the opposite edge of such third transmission axis, the eleventh pinion (11), which is gear connected in the transmission axis, the eleventh pinion (11) which is gear connected to the twelfth pinion (12), causes clockwise motion, the 13^th pinion (13) which rotates the crown (14) of the dosing means. 21 - Mechanism, as in claim 20, characterized in that the transmission relation of the pinions comprises 1:1. 22 - Mechanism, as in claim 20, characterized in that the compensation of the spin generated by the vertical movement of the pantographic arm is provided by the inversed positioning of the fifth pinion, fixed in the first intermediary axis, in relation to the eight pinion, fixed in the second intermediary axis. 23 - Mechanism, as in claim 20, characterized in that the rotation of the sixth pinion in the fixed point of the transmission, caused by the vertical movement of the second transmission axis in relation to the first intermediary axis, is compensated by the rotation of the seventh pinion in the mobile point of the transmission, by means of the corresponding vertical movement of the second transmission axis in relation to the second intermediary axis. 24 - Hinged transmission mechanism applied in a pantographic support of agricultural machines and implements, characterized that a second embodiment the lower and upper pantographic arm (52) and (54) are narrowed and the lower pantographic arm is totally close for avoid direct contact with the transmission axis (C).