CA2412325A1 - Machine for making continuous grids for electric accumulator plates - Google Patents
Machine for making continuous grids for electric accumulator plates Download PDFInfo
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- CA2412325A1 CA2412325A1 CA 2412325 CA2412325A CA2412325A1 CA 2412325 A1 CA2412325 A1 CA 2412325A1 CA 2412325 CA2412325 CA 2412325 CA 2412325 A CA2412325 A CA 2412325A CA 2412325 A1 CA2412325 A1 CA 2412325A1
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- Prior art keywords
- eccentric shaft
- machine according
- die
- transmission unit
- movement
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D25/00—Machines or arrangements for shearing stock while the latter is travelling otherwise than in the direction of the cut
- B23D25/02—Flying shearing machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
- H01M4/74—Meshes or woven material; Expanded metal
- H01M4/745—Expanded metal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/82—Multi-step processes for manufacturing carriers for lead-acid accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Machine for making grids for accumulator plates, comprising a supporting structure (7) lying on the ground and mounting die means (9) operatively acting upon a continuous lead tape that translate with a substantially constant speed along an advancement direction (A), movement means (10) for moving the die means (9) with an advancement speed component that is oriente d along the advancement direction (A), and with an expansion speed component that is oriented along a direction (B) that is normal to the translation direction (A). In turn, the movement means (10) comprise a first motorised eccentric shaft (11) mechanically coupled with the die means (9) through a movement transmission unit (12). According to the invention, the movement means (10) further comprise at least one second eccentric shaft (13) rotationally driven in phase with the firs (11) eccentric shaft that is mechanically coupled with the movement transmission unit (12) for imparting a speed correcting component to the die means (9), said speed correcting component being oriented along the advancement direction (A) in opposite sen se with respect thereto.
Description
MACHINE FOR MAKING CONTINUOUS GRIDS FOR ELECTRIC
ACCUMULATOR PLATES
Field of the invention 's The present invention relates to a machine for the formation of grids for electric accumulator plates.
The machine according to the present invention may be for being to advantageously employed for production processes of electric accumulators wherein a continuous grid is obtained starting from a continuous lead ribbon or tape, which continuous grid is cut into pieces of predetermined length to obtain single plates to be inserted into electric accumulators.
is Background of the invention Nowadays, according to the known art, the machines for forming lead tapes operate in a generally intermittent fashion.
2o For that purpose, such machines are traditionally provided with a feeding system that is capable of advancing the lead tape stepwise through a die by means of which the tape is expanded and consequently the grid mesh is formed.
2s As known, in such machines the tape stops in correspondence of the expansion area in order to be formed and expanded by the teeth of the die, which is generally actuated by movement means also coupled with the feeding system. Once the expansion has taken place, the tape advances by a . predetermined length in order to make it possible for a subsequent portion of 3o tape to be formed.
In practice, these known machines have proven to be affected by a number of drawbacks. As known in fact the discontinuous feeding system of these machines does not make it possible to achieve high productivity levels and this because the stepwise advancement speed of the lead tape is inevitably limited by the mechanical resistance of the lead.
A further shortcoming stems from the fact that these machines do not allow production of grids having very high quality level. This is particularly due to the stepwise advancement of the lead tape that is imparted by the discontinuous to feeding system. In fact such a system brings about several inaccuracies in the correct positioning of the tape in the expansion area because of the repeated stop-and-go phases. The thus obtained grid production characterised by an uneven distribution of mesh that cause the grids to acquire a rather irregular aspect.
In order to overcome the above mentioned drawbacks, a machine for formation of electric accumulators grid has been recently proposed which accomplishes the lead tape expansion on a continuous basis by means of a suitable mechanism that allows the expander die to follow the tape with a substantially 2o equal advancement speed along the whole formatioh length.
This machine, described and claimed in the Italian patent application IT-A-VR980000056 comprises movement means for the advancement of a continuous tape across a formation area associated with die means moved by actuating means according to a motion law having a corriponent oriented along the tape advancement direction and another component oriented along a direction that is substantially normal to the tape advancement direction. The first component allows the die teeth to advance substantially in synchronously way with respect to the tape, whereas the second component allows the die 3o teeth to indent and expand the tape during a pressing phase of the machine.
ACCUMULATOR PLATES
Field of the invention 's The present invention relates to a machine for the formation of grids for electric accumulator plates.
The machine according to the present invention may be for being to advantageously employed for production processes of electric accumulators wherein a continuous grid is obtained starting from a continuous lead ribbon or tape, which continuous grid is cut into pieces of predetermined length to obtain single plates to be inserted into electric accumulators.
is Background of the invention Nowadays, according to the known art, the machines for forming lead tapes operate in a generally intermittent fashion.
2o For that purpose, such machines are traditionally provided with a feeding system that is capable of advancing the lead tape stepwise through a die by means of which the tape is expanded and consequently the grid mesh is formed.
2s As known, in such machines the tape stops in correspondence of the expansion area in order to be formed and expanded by the teeth of the die, which is generally actuated by movement means also coupled with the feeding system. Once the expansion has taken place, the tape advances by a . predetermined length in order to make it possible for a subsequent portion of 3o tape to be formed.
In practice, these known machines have proven to be affected by a number of drawbacks. As known in fact the discontinuous feeding system of these machines does not make it possible to achieve high productivity levels and this because the stepwise advancement speed of the lead tape is inevitably limited by the mechanical resistance of the lead.
A further shortcoming stems from the fact that these machines do not allow production of grids having very high quality level. This is particularly due to the stepwise advancement of the lead tape that is imparted by the discontinuous to feeding system. In fact such a system brings about several inaccuracies in the correct positioning of the tape in the expansion area because of the repeated stop-and-go phases. The thus obtained grid production characterised by an uneven distribution of mesh that cause the grids to acquire a rather irregular aspect.
In order to overcome the above mentioned drawbacks, a machine for formation of electric accumulators grid has been recently proposed which accomplishes the lead tape expansion on a continuous basis by means of a suitable mechanism that allows the expander die to follow the tape with a substantially 2o equal advancement speed along the whole formatioh length.
This machine, described and claimed in the Italian patent application IT-A-VR980000056 comprises movement means for the advancement of a continuous tape across a formation area associated with die means moved by actuating means according to a motion law having a corriponent oriented along the tape advancement direction and another component oriented along a direction that is substantially normal to the tape advancement direction. The first component allows the die teeth to advance substantially in synchronously way with respect to the tape, whereas the second component allows the die 3o teeth to indent and expand the tape during a pressing phase of the machine.
In practice, though this machine enables to achieve improved productivity and quality with respect to the prior known machine, it entails a remarkable operative limitation due to the fact that the die is actually provided with substantially the same advancement speed of the tape only along the forming tract, whilst at the end of such tract it is subject to a remarkable deceleration along the tape advancement direction and to an acceleration along the detachment direction of the die.
The motion law of the die does not practically allow to achieve large 1o expansions of the tape, i.e. expansions involving deep indentations with teeth of remarkable length, As a matter of fact, a sudden slowing down of the die accompanied by expansions of remarkable extent prevents the lead to detach from the teeth of the die, and in practice gives raise to an incompatible interference between the advancing tape and the teeth of the die.
is Such circumstance practically limits the operation of said known type of machine to expansions of reduced entity.
A further drawback of this known machine resides in that it does not allow to 2o vary in a cost effective and simple way the type of expansion to be carried out on the lead tape, and consequently to change the final shape of the continuous grid to be obtained. Such shape variation is ever chore felt within the field of electric accumulator production as it is in this field there is an increasing tendency to differentiate the shape of the positive grid with respect to that of 2s the negative grid because of their different electrochemical behaviour.
At the present time, in order to change the expansion of the tape in this known type of machine, it is necessary to replace the eccentric shafts that are present in the mechanism of the die. Such operation is slow an cumbersome and 3o negatively affects the machine productivity.
A further shortcoming of this known type of machines is related to the variations of the operating speed that occur for exemple during the start-up or stopping phase of the machine. In fact, due to the remarkable weight of the movable members present in die moving mechanism, the machine components s are subjected to mechanical deformations that vary according to the number of revolution and that finally induce indentations in the tape.
The above circumstance gives rise to an undesired modification of the grid conformation as a function of the machine operating speed and, therefore, in 1o particular, of the speed of the machine at the start-up and stopping phases.
Summary of the Invention A primary object of the present invention is therefore to overcome the 15 drawbacks affecting the machines of the known types by providing a machine for the production of electric accumulators grids, which enables to continuously form lead. tapes with expansions having the desired extent, and in particular having remarkable sizes.
2o A further object of the present invention is to provide a machine that allows to vary the forming of the tape, hence the shape of the grid product by means of simple adjustment operations.
Another object of the present invention is to provide a machine with an 2s optimum operating rate that allows to maintairi the extent of the tape expansions constant at any operating speed and in particular during the start-up and stopping phases.
A further object of the present invention is to provide a machine that is 3o structurally simple and operatingly fully reliable in use.
The motion law of the die does not practically allow to achieve large 1o expansions of the tape, i.e. expansions involving deep indentations with teeth of remarkable length, As a matter of fact, a sudden slowing down of the die accompanied by expansions of remarkable extent prevents the lead to detach from the teeth of the die, and in practice gives raise to an incompatible interference between the advancing tape and the teeth of the die.
is Such circumstance practically limits the operation of said known type of machine to expansions of reduced entity.
A further drawback of this known machine resides in that it does not allow to 2o vary in a cost effective and simple way the type of expansion to be carried out on the lead tape, and consequently to change the final shape of the continuous grid to be obtained. Such shape variation is ever chore felt within the field of electric accumulator production as it is in this field there is an increasing tendency to differentiate the shape of the positive grid with respect to that of 2s the negative grid because of their different electrochemical behaviour.
At the present time, in order to change the expansion of the tape in this known type of machine, it is necessary to replace the eccentric shafts that are present in the mechanism of the die. Such operation is slow an cumbersome and 3o negatively affects the machine productivity.
A further shortcoming of this known type of machines is related to the variations of the operating speed that occur for exemple during the start-up or stopping phase of the machine. In fact, due to the remarkable weight of the movable members present in die moving mechanism, the machine components s are subjected to mechanical deformations that vary according to the number of revolution and that finally induce indentations in the tape.
The above circumstance gives rise to an undesired modification of the grid conformation as a function of the machine operating speed and, therefore, in 1o particular, of the speed of the machine at the start-up and stopping phases.
Summary of the Invention A primary object of the present invention is therefore to overcome the 15 drawbacks affecting the machines of the known types by providing a machine for the production of electric accumulators grids, which enables to continuously form lead. tapes with expansions having the desired extent, and in particular having remarkable sizes.
2o A further object of the present invention is to provide a machine that allows to vary the forming of the tape, hence the shape of the grid product by means of simple adjustment operations.
Another object of the present invention is to provide a machine with an 2s optimum operating rate that allows to maintairi the extent of the tape expansions constant at any operating speed and in particular during the start-up and stopping phases.
A further object of the present invention is to provide a machine that is 3o structurally simple and operatingly fully reliable in use.
These and other objects are all accomplished by the machine for making accumulator grids according to the present invention, that comprises a supporting structure lying on the ground, die means mounted on the supporting structure and operatively acting upon a continuous lead tape that moves at a s substantially constant advancement speed along ,an advancement direction, moving means for moving the die means with a speed component oriented along the advancement direction, to allow the die means to advance in a substantially synchronous manner with respect to the continuous tape and with an expansion speed component which is oriented along a direction that is 1o normal to the advancement direction in order to accomplish the expansion of the continuous tape, the moving means comprising at least one first motorised eccentric shaft mechanically coupled to the die means through a movement transmission unit. According to the present invention, the machine is characterised in that the movement means further comprise a second eccentric is shaft driven in phase from the first eccentric shaft, which second eccentric shaft being also mechanically coupled with the movement transmission unit for imparting to the die means a speed correcting coriiponent oriented along the translation direction and in opposite sense with respect thereto.
2o With this machine it is possible to continuously expand lead tapes with indentations of any depths, within predetermined limits, for producing electric accumulator grids having a desired conformation.
Furthermore, the machine according to the present invention is constructively 25 simple and operatively fully reliable.
Short Description of the Drawin s The technical features of the present inventiort according to the above 3o mentioned objects and aims are clearly defined by the annexed claims, and the advantages of the invention will appear more clearly by the following detailed description, furnished with reference to the attached tables of drawings that illustrate a preferred embodiment of the invention by way of not limiting example, wherein:
FIG. 1 schematically illustrates a production line of electric accumulator plates incorporating the forming machine according to the present invention;
FIG. 2 schematically illustrates a side view of the machine with some parts sectioned and removed to better show the structure of other parts;
FIG. 3 schematically illustrates a first cross sectional view of the 1o machine according to the invention with some parts thereof removed, said cross section being taken along the line III-III of Fig. 2;
FIG. 4 schematically illustrates a second cross sectional view of the machine according to the invention with some parts thereof removed, said cross section being taken removed along line IV-IV'of Fig. 2;
is FIG. 5 illustrates a magnified detail of the machine according to the invention and relating to a carriage engaged onto a guide;
FIG. 6 illustrates a schematic view of the movement means of the die for the indentation and expansion of the continuous tape.
2o Detailed Description of a preferred Form of Embodiment With reference to the attached drawings, the m~ichine for the formation of grids according to the present invention is overall indicated with the reference numeral 1.
The machine is operatively interposed between a feeding unit 2 for feeding a continuous lead tape (not illustrated in the drawings as being of a well known type) arranged upstream of a traction unit 3. Advantageously, along the same lead plate production line, at the outlet of traction unit 3, a grid flattering unit 4 and a lug cutting unit 5 may also be provided. In such a way, the production of lead grids may be accomplished by means of a single and very compact production plant 6 depicted in Fig. 1.
Hereinafter reference will be made to an embodiment of machine 1 for forming a continuous lead tape for the production of electric accumulators plates, considering that the material making up the tape may be any alloy suitable for the production of electric accumulators.
With particular reference to the attached Figures 2, 3 and 4, the machine to according to the invention comprises a supporting structure 7 lying on the ground, die means 9 mounted on the supporting structure in correspondence of an expansion zone 8, the die means 8 being' operatively acting on a continuous tape 10 in order to cause expansion anal formation thereof.
In operation, the tape moves across the expansion zone 8 along an advancement direction A with a substantially constant advancement speed imparted by feeding unit 2 and by a traction unit 3 mentioned above.
Die means 9 are actuated by movement means 10 to cyclically exert pressing 2o and expanding action onto the tape passing through the expansion zone 8. By means of a mechanism that will be described in detail hereinafter, these movement means drive die means 9 according to a motion law providing an advancement speed component oriented along the advancement direction A, to enable the die means to advance in substantially synchronous way with the tape, and an expansion speed component oriented along a direction B that is normal to the advancement direction A to accorhplish the expansion of the tape.
The movement means 10 are driven by means of two first eccentric shafts 11 (see fig. 2) which are brought into rotation by a motor (not shown) and they are mechanically coupled with die means 9 through a movement motion transmission unit 12. This latter also fulfills the function of supporting the die means 9, while discharging their weight onto the first eccentric shafts 1 1.
According to the invention, movement means 10'further comprise a second eccentric shaft 13 which is rotary driven in phase with the first eccentric shafts 1 1 and is also mechanically coupled with the movement transmission unit 13 to thereby impart to die means 9 a correcting component speed oriented along the advancement direction A and in opposition thereto.
1o Thus, a compensation effect of the advancement speed held by die means 9 takes place both during the tape expansion phase and during the subsequent phase of detachment from the tape surface. In other words, with particular reference to the schematic drawing of Fig. 6, the two eccentric shafts 1 1 and 13 are interconnected and synchronised in such a way that, when the die 1s means 9 start to perform the tape following it at a predetermined advancement speed, the speed compensation due to the action of second eccentric .shaft 13 attains the minimum value. The compensation reaches its maximuri~~ amount in correspondence of the highest value of the advancement speed of die means 9.
The use of two eccentric shafts 11 and 13 to control the motion law affecting the movement transmission unit 12 enables the die means 9 to follow the tape at an advancement speed that is substantially proximal to the constant advancement speed of the tape for the whole pressing-expanding tract.
This makes it possible to accomplish an optimal expansion of the tape, particularly without any jerks caused by sudden changes of speed of the die means 9.
Advantageously, the movement transmission unit 12 comprises connection means 14 having a first end 15 coupled with the first eccentric shaft 1 1 and a second end 16 coupled with the eccentric shaft 13.
More precisely, connection means 14 comprise one first pair of a arms 17 and one second pair of arms 18 that are mutually interconnected at one end thereof by hinges 19.
The first pair of arms 17 is further fixed with its other end 15 to a first 1o trunnion 20 mounted on the first eccentric shaft 1 ~1, whereas the second pair of arms 18 is fixed with its other end 16 to a second trunnion 21 mounted around a second eccentric shaft 13.
In accordance with the embodiment illustrated in the attached drawings, and with particular reference to Fig. 3, the first pair of arms 17 horizontally supports the ends of a supporting shaft 22 which in turn supports a frame 23 carrying die means 9.
Frame 23 is mechanically coupled to supporting shaft 22 by means of 2o bearings 24 which allow free rotation thereof about the axis R of shaft 22.
The above mentioned die means 9 are provided ~Jvith a plurality of teeth 25 that are caused to interact with the continuous tape to indent and expand it along a normal direction B with respect to its horizontal advancement direction A. In such a way, a well known continuous lead grid type is obtained in which the mesh amplitude depends both on teeth 25 size and on depth of the indentation, hence on the movement of die means 9. Teeth 25 are .arranged along a plurality of parallel rov~is that are symmetrically positioned with respect to a middle plane P on a plate 26 that is integral with 3o frame 23.
A detaching member 27 is advantageously located between teeth 25, which member is integral with the supporting structure 7 of machine 1 and serves to detach the grid edges formed by teeth 25 of die means 9.
The expansion exerted onto the tape is accomplished by the combined action of die means 9 and of a counter-knife 28 that is :mechanically connected to the movement transmission unit 12 through transmission means 29 which drive the counter-knife 28 along the advancement direction A having the same speed component held by die means 9.
To this end, counter-knife 28 is rigidly secured to a slide 30 that is slidingly mounted on guides 31 mechanically fixed to supporting structure 7 in order to guidingly support counter-knife 28 along the advancement direction A.
1s According to a preferred embodiment of the present invention illustrated in Fig. 5, transmission means 29 comprise pairs of vertical columns 29' that are integral with the movement transmission unit 12 (and are particularly fixed in proximity of plate 26 bearing teeth 25), which columns are free to vertically slide inside second guides 32 integral with slide 30 in order to move counter-2o knife 28 along the advancement direction A.
Advantageously, guides 31 supporting counter-knife 28 by means of slide 30 are mechanically coupled with a pair of third eccentric shafts 33 which are provided on the supporting structure 7 and that are capable of adjusting the 25 vertical position of counter-knife 28 with respect tb die means 9 according to their angular position. Third eccentric shafts 33 ark brought into rotation by a motor 34 through reduction gears 35.
During operation of machine 1 the relative position of die means 9 with 3o respect to counter-knife 28 is prone to change as 'a function of the operating speed of machine 1 because of the structural deformations taking place internally thereof. By means of the pair of eccentric shafts 33, it is possible to maintain a constant relative distance between die means 9 and counter-knife 28 by simply changing the angular position of the pair of eccentric s shafts 33 according to the speed of machine 1.
This allows to produce a continuous grid having a mesh size that is constant and continuous, even during start-up and stopping phases of machine 1.
1o According to a further aspect of the present invention, the machine further comprises adjustment means 37 for changing the phase between first eccentric shaft 1 1 and second eccentric shaft 13.
Advantageously, said adjustment means 37 comprise a graduated scale 36 is positioned in correspondence of second eccentric shaft 13, which makes it possible to controllingly rotate the second eccentric shaft 13 when this fatter is uncoupled from first eccentric shaft 11. Once the adjustment has been completed, the coupling with first eccentric shaft X11 is re-established with a phase changed by a predetermined amount. In such a way, it is possible to 2o change the motion law followed by the die means 9 and counter-knife 28 in order to produce grids with meshes having different conformations.
The thus conceived invention achieves its intended objects and aims.
25 Obviously, the invention may assume in practice other shapes and configurations different from that illustrated above without departing from the scope of protection.
Moreover, all details may be substituted by technically equivalent elements 3o and any sizes, shapes and materials may be used according to the specific needs and requirements.
2o With this machine it is possible to continuously expand lead tapes with indentations of any depths, within predetermined limits, for producing electric accumulator grids having a desired conformation.
Furthermore, the machine according to the present invention is constructively 25 simple and operatively fully reliable.
Short Description of the Drawin s The technical features of the present inventiort according to the above 3o mentioned objects and aims are clearly defined by the annexed claims, and the advantages of the invention will appear more clearly by the following detailed description, furnished with reference to the attached tables of drawings that illustrate a preferred embodiment of the invention by way of not limiting example, wherein:
FIG. 1 schematically illustrates a production line of electric accumulator plates incorporating the forming machine according to the present invention;
FIG. 2 schematically illustrates a side view of the machine with some parts sectioned and removed to better show the structure of other parts;
FIG. 3 schematically illustrates a first cross sectional view of the 1o machine according to the invention with some parts thereof removed, said cross section being taken along the line III-III of Fig. 2;
FIG. 4 schematically illustrates a second cross sectional view of the machine according to the invention with some parts thereof removed, said cross section being taken removed along line IV-IV'of Fig. 2;
is FIG. 5 illustrates a magnified detail of the machine according to the invention and relating to a carriage engaged onto a guide;
FIG. 6 illustrates a schematic view of the movement means of the die for the indentation and expansion of the continuous tape.
2o Detailed Description of a preferred Form of Embodiment With reference to the attached drawings, the m~ichine for the formation of grids according to the present invention is overall indicated with the reference numeral 1.
The machine is operatively interposed between a feeding unit 2 for feeding a continuous lead tape (not illustrated in the drawings as being of a well known type) arranged upstream of a traction unit 3. Advantageously, along the same lead plate production line, at the outlet of traction unit 3, a grid flattering unit 4 and a lug cutting unit 5 may also be provided. In such a way, the production of lead grids may be accomplished by means of a single and very compact production plant 6 depicted in Fig. 1.
Hereinafter reference will be made to an embodiment of machine 1 for forming a continuous lead tape for the production of electric accumulators plates, considering that the material making up the tape may be any alloy suitable for the production of electric accumulators.
With particular reference to the attached Figures 2, 3 and 4, the machine to according to the invention comprises a supporting structure 7 lying on the ground, die means 9 mounted on the supporting structure in correspondence of an expansion zone 8, the die means 8 being' operatively acting on a continuous tape 10 in order to cause expansion anal formation thereof.
In operation, the tape moves across the expansion zone 8 along an advancement direction A with a substantially constant advancement speed imparted by feeding unit 2 and by a traction unit 3 mentioned above.
Die means 9 are actuated by movement means 10 to cyclically exert pressing 2o and expanding action onto the tape passing through the expansion zone 8. By means of a mechanism that will be described in detail hereinafter, these movement means drive die means 9 according to a motion law providing an advancement speed component oriented along the advancement direction A, to enable the die means to advance in substantially synchronous way with the tape, and an expansion speed component oriented along a direction B that is normal to the advancement direction A to accorhplish the expansion of the tape.
The movement means 10 are driven by means of two first eccentric shafts 11 (see fig. 2) which are brought into rotation by a motor (not shown) and they are mechanically coupled with die means 9 through a movement motion transmission unit 12. This latter also fulfills the function of supporting the die means 9, while discharging their weight onto the first eccentric shafts 1 1.
According to the invention, movement means 10'further comprise a second eccentric shaft 13 which is rotary driven in phase with the first eccentric shafts 1 1 and is also mechanically coupled with the movement transmission unit 13 to thereby impart to die means 9 a correcting component speed oriented along the advancement direction A and in opposition thereto.
1o Thus, a compensation effect of the advancement speed held by die means 9 takes place both during the tape expansion phase and during the subsequent phase of detachment from the tape surface. In other words, with particular reference to the schematic drawing of Fig. 6, the two eccentric shafts 1 1 and 13 are interconnected and synchronised in such a way that, when the die 1s means 9 start to perform the tape following it at a predetermined advancement speed, the speed compensation due to the action of second eccentric .shaft 13 attains the minimum value. The compensation reaches its maximuri~~ amount in correspondence of the highest value of the advancement speed of die means 9.
The use of two eccentric shafts 11 and 13 to control the motion law affecting the movement transmission unit 12 enables the die means 9 to follow the tape at an advancement speed that is substantially proximal to the constant advancement speed of the tape for the whole pressing-expanding tract.
This makes it possible to accomplish an optimal expansion of the tape, particularly without any jerks caused by sudden changes of speed of the die means 9.
Advantageously, the movement transmission unit 12 comprises connection means 14 having a first end 15 coupled with the first eccentric shaft 1 1 and a second end 16 coupled with the eccentric shaft 13.
More precisely, connection means 14 comprise one first pair of a arms 17 and one second pair of arms 18 that are mutually interconnected at one end thereof by hinges 19.
The first pair of arms 17 is further fixed with its other end 15 to a first 1o trunnion 20 mounted on the first eccentric shaft 1 ~1, whereas the second pair of arms 18 is fixed with its other end 16 to a second trunnion 21 mounted around a second eccentric shaft 13.
In accordance with the embodiment illustrated in the attached drawings, and with particular reference to Fig. 3, the first pair of arms 17 horizontally supports the ends of a supporting shaft 22 which in turn supports a frame 23 carrying die means 9.
Frame 23 is mechanically coupled to supporting shaft 22 by means of 2o bearings 24 which allow free rotation thereof about the axis R of shaft 22.
The above mentioned die means 9 are provided ~Jvith a plurality of teeth 25 that are caused to interact with the continuous tape to indent and expand it along a normal direction B with respect to its horizontal advancement direction A. In such a way, a well known continuous lead grid type is obtained in which the mesh amplitude depends both on teeth 25 size and on depth of the indentation, hence on the movement of die means 9. Teeth 25 are .arranged along a plurality of parallel rov~is that are symmetrically positioned with respect to a middle plane P on a plate 26 that is integral with 3o frame 23.
A detaching member 27 is advantageously located between teeth 25, which member is integral with the supporting structure 7 of machine 1 and serves to detach the grid edges formed by teeth 25 of die means 9.
The expansion exerted onto the tape is accomplished by the combined action of die means 9 and of a counter-knife 28 that is :mechanically connected to the movement transmission unit 12 through transmission means 29 which drive the counter-knife 28 along the advancement direction A having the same speed component held by die means 9.
To this end, counter-knife 28 is rigidly secured to a slide 30 that is slidingly mounted on guides 31 mechanically fixed to supporting structure 7 in order to guidingly support counter-knife 28 along the advancement direction A.
1s According to a preferred embodiment of the present invention illustrated in Fig. 5, transmission means 29 comprise pairs of vertical columns 29' that are integral with the movement transmission unit 12 (and are particularly fixed in proximity of plate 26 bearing teeth 25), which columns are free to vertically slide inside second guides 32 integral with slide 30 in order to move counter-2o knife 28 along the advancement direction A.
Advantageously, guides 31 supporting counter-knife 28 by means of slide 30 are mechanically coupled with a pair of third eccentric shafts 33 which are provided on the supporting structure 7 and that are capable of adjusting the 25 vertical position of counter-knife 28 with respect tb die means 9 according to their angular position. Third eccentric shafts 33 ark brought into rotation by a motor 34 through reduction gears 35.
During operation of machine 1 the relative position of die means 9 with 3o respect to counter-knife 28 is prone to change as 'a function of the operating speed of machine 1 because of the structural deformations taking place internally thereof. By means of the pair of eccentric shafts 33, it is possible to maintain a constant relative distance between die means 9 and counter-knife 28 by simply changing the angular position of the pair of eccentric s shafts 33 according to the speed of machine 1.
This allows to produce a continuous grid having a mesh size that is constant and continuous, even during start-up and stopping phases of machine 1.
1o According to a further aspect of the present invention, the machine further comprises adjustment means 37 for changing the phase between first eccentric shaft 1 1 and second eccentric shaft 13.
Advantageously, said adjustment means 37 comprise a graduated scale 36 is positioned in correspondence of second eccentric shaft 13, which makes it possible to controllingly rotate the second eccentric shaft 13 when this fatter is uncoupled from first eccentric shaft 11. Once the adjustment has been completed, the coupling with first eccentric shaft X11 is re-established with a phase changed by a predetermined amount. In such a way, it is possible to 2o change the motion law followed by the die means 9 and counter-knife 28 in order to produce grids with meshes having different conformations.
The thus conceived invention achieves its intended objects and aims.
25 Obviously, the invention may assume in practice other shapes and configurations different from that illustrated above without departing from the scope of protection.
Moreover, all details may be substituted by technically equivalent elements 3o and any sizes, shapes and materials may be used according to the specific needs and requirements.
Claims (14)
1. Machine for making grids for accumulator plates comprising:
- a supporting structure (7) lying on the ground;
- die means (9) mounted on said supporting structure (7), operatively acting upon a continuous lead tape translating at a substantially constant speed along an advancement direction (A);
- movement means (10) adapted to move said die means (9) with an advancement speed component that is oriented along said advancement direction (A), to allow said die means (9) to advance in a synchronous manner with respect to said continuous tape, and with an expansion speed component oriented along a direction (B) that is normal to said translation direction (A) so as to accomplish the expansion of said continuous tape, said movement means (10) comprising at least one first motorised eccentric shaft (11) mechanically coupled with said die means (9) through a movement transmission unit (12);
characterised in that said movement means (10) further comprise at least one second eccentric shaft (13) rotating synchronously in phase with said first eccentric shaft (11), this latter being mechanically coupled with said movement transmission unit (12) and being adapted to impart said die means (9) a speed correcting component oriented along translation direction (A) in opposed sense with respect to said advancement direction.
- a supporting structure (7) lying on the ground;
- die means (9) mounted on said supporting structure (7), operatively acting upon a continuous lead tape translating at a substantially constant speed along an advancement direction (A);
- movement means (10) adapted to move said die means (9) with an advancement speed component that is oriented along said advancement direction (A), to allow said die means (9) to advance in a synchronous manner with respect to said continuous tape, and with an expansion speed component oriented along a direction (B) that is normal to said translation direction (A) so as to accomplish the expansion of said continuous tape, said movement means (10) comprising at least one first motorised eccentric shaft (11) mechanically coupled with said die means (9) through a movement transmission unit (12);
characterised in that said movement means (10) further comprise at least one second eccentric shaft (13) rotating synchronously in phase with said first eccentric shaft (11), this latter being mechanically coupled with said movement transmission unit (12) and being adapted to impart said die means (9) a speed correcting component oriented along translation direction (A) in opposed sense with respect to said advancement direction.
2. Machine according to claim 1, characterised in that said movement transmission unit (12) comprises connection means (14) with a first end (15) mechanically coupled with said first eccentric shaft (11) and with a second end (16) mechanically coupled with said second eccentric shaft (13).
3. Machine according to claim 2, characterised in that said connection means (14) are mechanically coupled with the ends of a supporting shaft (22), said supporting shaft being horizontal and supporting a frame (23) on which said die means 19) are mounted and that is free to rotate about the axis (R) of said supporting shaft 122).
4. Machine according to claim 1, characterised in that it comprises a counter-knife (28) that is operatively associated with said die means (9) and is mechanically connected with said movement transmission unit (12).
5. Machine according to claim 4, characterised in that said first eccentric shaft (11) is rigidly connected with said first end (15) of said connection means (14).
6. Machine according to claim 4, characterised in that said counter-knife (28) is integral with at least one slide (30), which is slidingly engaged onto at least one first guide (31) that is mechanically fixed to said supporting structure (7) to guide said counter-knife (28) along said advancement direction (A).
7. Machine according to claims 5 and 6, characterised in that said transmission means (29) are provided which comprise at least one vertical column (29) that is mounted on said movement transmission unit (12) and is free to vertically slide inside a second guide (32) that is integral with said slide (30) to move said counter-knife (28) along said advancement direction (A).
8. Machine according to claim 6, characterised in that it comprises at least one third eccentric motorised shaft (33) mounted on said supporting structure (7), mechanically coupled with said first guide (31) in order to adjust the position held by said counter-knife (28) with respect to the die means (9) according to the angular position of said third eccentric shaft (33).
9. Machine according to claim 2, characterised in that said movement transmission unit (12) comprises a first trunnion (20) mounted on said first eccentric shaft (11) and rigidly connected with said first end (15) of said connection means (14).
10. Machine according to claim 2, characterised in that said movement transmission unit (12) comprises a second trunnion (21) mounted on said second eccentric shaft (13) and connected with the second end (16) of said connection means (14).
11. Machine according to claims 8 and 9, characterised in that said connection means (14) comprise a first and second pair of arms (17, 18) mutually hinged (19) in correspondence of one of their ends.
12. Machine according to claim 11, characterised in that said first pair of arms (17) is fixed with its other end (15) to said first trunnion (20) and said second pair of arms (18) is fixed with its other end (16) to said second trunnion (21).
13. Machine according to claim 1, characterised in that it comprises adjustment means (37) for changing the phase between said first eccentric shaft (11) and said second eccentric shaft (13).
14. Machine according to claim 13, characterised in that said adjustment means (37) comprise a graduated scale (36) positioned in correspondence of said second eccentric shaft (13) and adapted to impart to said second eccentric shaft (13) a controlled rotation when said second eccentric shaft (13) is uncoupled from said first eccentric shaft (11) to allow a subsequent coupling with said first eccentric shaft (11) with a phase error of predetermined amount.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IT2000/000247 WO2001096043A1 (en) | 2000-06-14 | 2000-06-14 | Machine for making continuous grids for electric accumulator plates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2412325A1 true CA2412325A1 (en) | 2001-12-20 |
Family
ID=11133529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2412325 Abandoned CA2412325A1 (en) | 2000-06-14 | 2000-06-14 | Machine for making continuous grids for electric accumulator plates |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1253266C (en) |
| AU (1) | AU5565600A (en) |
| CA (1) | CA2412325A1 (en) |
| WO (1) | WO2001096043A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1402081B1 (en) * | 2010-09-22 | 2013-08-28 | Sovema Spa | GRID FORMING MACHINE FOR THE CONSTRUCTION OF ELECTRIC STORAGE PLATES. |
| ITUB20153071A1 (en) | 2015-08-11 | 2017-02-11 | Sovema Spa | PLANT FOR THE REALIZATION OF PLATES FOR ELECTRIC ACCUMULATORS AND ITS RELATED PROCEDURE FOR THE CONSTRUCTION OF THOSE PLATES |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102024A (en) * | 1976-12-23 | 1978-07-25 | Eltra Corporation | Method and apparatus for making flattened expanded lead strip for battery plates |
| US4345452A (en) * | 1979-08-15 | 1982-08-24 | General Battery Corporation | Cam shaft operated punch press for expanding lead alloy battery grid material |
| GB2071530B (en) * | 1980-03-17 | 1983-02-02 | Chloride Group Ltd | Apparatus for expanding metallic strip |
| DE19728913C1 (en) * | 1997-07-08 | 1998-11-26 | Joachim Bruensch | Extrusion machine for strip metal |
| IT1299680B1 (it) * | 1998-06-18 | 2000-03-24 | Sovema Srl | Macchina formatrice per nastri metallici, in particolare per la realizzazione di piastre per accumulatori elettrici |
-
2000
- 2000-06-14 WO PCT/IT2000/000247 patent/WO2001096043A1/en active IP Right Grant
- 2000-06-14 AU AU55656/00A patent/AU5565600A/en not_active Abandoned
- 2000-06-14 CN CNB008196575A patent/CN1253266C/en not_active Expired - Fee Related
- 2000-06-14 CA CA 2412325 patent/CA2412325A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU5565600A (en) | 2001-12-24 |
| CN1253266C (en) | 2006-04-26 |
| CN1454125A (en) | 2003-11-05 |
| WO2001096043A1 (en) | 2001-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |