IT202000008707A1 - GYM MACHINE FOR WEIGHT LIFTING - Google Patents

Description

GYM MACHINE FOR WEIGHT LIFTING.

DESCRIPTION

The invention relates to an exercise machine for weight lifting. Nowadays in weightlifting, bodybuilding, physical training and fitness gyms in general, strength and hypertrophy training is carried out mainly by means of a barbell, that is a grip bar, usually made of steel, equipped with bodies of load at opposite ends.

To date, the free balance? the main tool for training and athletic preparation in the weight room; the athlete applies to the extremities of the barbell the desired load, secures it, by means of locking devices, and the performance of a predetermined exercise begins. In case of use of particularly high loads, the athlete needs external help from one or more? wingmen, which must be immediately available to complete the exercise safely, since? there are no safety devices that can intervene in the event of an injury to the athlete when he is lifting the barbell.

One of the main limitations of training with the barbells described above? therefore related to the fact that such a training can not? be carried out in complete safety except in the presence of particularly attentive and prepared followers to intervene to support the athlete in any time of need.

Another known limitation of barbell training? consisting of the numerous dead times necessary for the replacement or addition of new and / or different load bodies at the opposite ends? of the gripping bar.

A further limitation of barbell training? consisting of the fact that the physical performance of the athlete is not? detectable with continuity? and precision, since? the available parameters are only the weight of the barbell and the execution time of the exercise.

Task of the present invention? that of developing an exercise machine for lifting weights capable of obviating the aforementioned drawbacks and limitations of the known art.

In particular, a purpose of the invention? that of developing an exercise machine that is safe and that can be used by an athlete without the presence of support staff in case of need. Another purpose of the invention? that of developing an exercise machine that allows to eliminate the dead times of replacing, removing or adding loads, typical actions of the use of barbells known today.

Another object of the invention? to develop an exercise machine capable of continuously detecting? and accuracy of the athlete's performance.

The task as well? the aforementioned purposes are achieved by an exercise machine for lifting weights according to claim 1.

Further characteristics of the exercise machine according to claim 1 are described in the dependent claims. The aim and the aforementioned purposes, together with the advantages that will be mentioned below, are highlighted by the description of an embodiment of the invention, which is given, by way of indication but not of limitation, with reference to the attached drawing tables, where:

- figure 1 represents a perspective view of an exercise machine according to the invention;

Figure 2 represents another perspective view of the gymnastic machine of Figure 1;

figure 3 represents a sectional side view of the exercise machine according to the invention;

figure 4 represents a side view of the gymnastic machine according to the invention;

Figure 5 is a sectional view of a detail of the exercise machine according to the invention;

figure 6 represents a top view of the detail of figure 5; figure 7 represents a sectional view of another detail of the exercise machine according to the invention;

figure 8 represents a front view of the detail of figure 7; figure 9 represents an operating diagram of the gymnastic machine according to the invention;

Figure 10 represents a schematic view of a variant embodiment of the invention.

With reference to the aforementioned figures, an exercise machine for lifting weights according to the invention? indicated as a whole with the number 10.

This exercise machine 10 includes:

- a supporting frame 11,

- two opposite first lateral guides 12 and 13, ascending-descending, developing according to a first direction X1,

- two first slides 14 and 15 slidably constrained each on a corresponding first lateral guide 12 and 13,

- two opposite second lateral guides 16 and 17, developing according to a second direction X2 transversal to the first direction X1, and each defined on board one of the first slides 14 and 15,

- two second slides 18 and 19 slidably constrained each on a corresponding second lateral guide 16 and 17,

- a lifting bar 20, each of the ends 20a, 20b of this lifting bar 20 being constrained to a corresponding second slide 18 and 19,

- motorized transmission means 21 configured for the application on the first slides 14 and 15 either of an opposition force to an upward thrust force, or of a downward traction force.

In the form of the invention described herein by way of non-limiting example of the invention itself, the supporting frame 11 comprises a ground support base 40, for example a quadrangular frame, inside which a user is positioned.

From the ground support base 40 two opposite shoulders 41 and 42 develop to support the first guides 12 and 13.

In the present embodiment, each of the shoulders 41 and 42 comprises two uprights 43 and 44 and an upper crosspiece 45.

In the present embodiment, the first direction X1? substantially vertical, or less than unavoidable construction and installation tolerances.

The two opposite first lateral guides 12 and 13 each comprise two bars 46 and 47 respectively, which extend between the base 40 and an overlying crosspiece 45.

The first guides 12 and 13 are each located inside the arch defined by the uprights 43 and 44 and by the crosspiece 45.

The two first slides 14 and 15, as clearly visible in the side view of Figure 4 and in the section of Figure 5, each comprise:

- two first slider sleeves 48 and 49,

- at least one transverse element, for example two transverse elements 50 and 51, for rigid connection between the two slider sleeves 48 and 49.

The first slider sleeves 48 and 49 slide on the respective bars 46 and 47 of the first lateral guides 12 and 13 by interposition of one or more? friction reduction devices 52 and 53, for example one or more? linear ball bearings, highlighted in figure 5.

In the present embodiment, the second lateral guides 16 and 17 each comprise a guide bar 54, clearly visible in Figures 3, 4 and 5, fixed by means of brackets 55 between the sleeves 48 and 49 of the respective first slide 14 and 15 to which they belong .

The guide bar 54? also positioned between the two transverse elements 50 and 51 of the first slide 14 and 15.

The two second slides 18 and 19 comprise, as clearly visible for the second slide 18 in Figures 7 and 8, each a second slider sleeve 58 to which? fixed a collar 59, configured for the constraint with one end? 20a or 20b of the spreader bar 20.

The collar 59 develops in a direction orthogonal to the direction of development and translation of the second slider sleeve 58.

The second slider sleeve 58 slides on the respective guide bar 54 of the corresponding second lateral guide 18 and 19 by interposition of one or more? friction reduction devices 60 and 61, for example one or more? linear ball bearings, highlighted in figure 7.

The spreader bar 20? bound at the ends? 20a and 20b to a corresponding collar 59 of a second slide 18 and 19 by means of friction reduction devices, for example rolling bearings 62. These friction reduction devices are configured in such a way as to allow the ends to be reduced. 20a and 20b of the spreader bar 20 to rotate by an angle of less than 10? about the X2 axis of the guide bar 54; this possibility? to rotate, albeit modest, allows the athlete to perform his exercises even in a slightly asymmetrical way.

The motorized transmission means 21 comprise, in the present embodiment, two electric motors 22 and 23.

Each of the two electric motors 22 and 23? configured to operate a corresponding longitudinal flexible element 24 and 25.

In a variant, not illustrated for simplicity? but to be understood as included in the present invention, the exercise machine according to the invention comprises a single electric motor configured to drive both flexible elements with longitudinal development.

Such flexible longitudinal elements 24 and 25 can comprise a belt, a chain, a rope or other similar and equivalent elements.

In the present embodiment, the longitudinally developed flexible elements 24 and 25 each consist of a toothed belt. The motorized transmission means 21 comprise, for each longitudinal flexible element 24 and 25, as schematized in the section of Figure 3:

- at least one lower pulley, for example a lower pulley 26, configured and positioned so as to deviate a longitudinal flexible element 24 and 25 coming from an electric motor 22 and 23 towards a lower part 14a and 15a of a said first slide 14 and 15,

- at least one upper pulley, for example two respective upper pulleys 28 and 29; these upper pulleys are configured and positioned so as to deviate a corresponding longitudinal flexible element 24 and 25 towards an upper part 14b and 15b of a first slide 14 and 15,

- a driving pulley 27, fixed to the shaft of the corresponding electric motor 22 and 23.

Each of the longitudinal elements 24 and 25, that is, from now on, the belts 24 and 25 for convenience. exhibition, defines a circuit that develops starting from a lower part 14a and 15a of a first slide 14 and 15, turns around the lower pulley 26, the driving pulley 27, the upper pulleys 28 and 29, up to the upper part 14b and 15b of the same first slide.

The attachment of a strap 24 and 25 to the respective first slide 14 and 15? made with fixing means to be understood as type in s? known.

These motorized transmission means 21 therefore comprise two symmetrical groups each comprising the pulleys, 26, 27, 28 and 29, and a toothed belt 24 or 25.

Each group? enslaved to a first vertical slide 14 and 15, and transmits a vertical linear translational motion to said first slide 14 and 15.

The pulleys act as transmissions which allow the respective belt 24 and 25 to go around the supporting frame 11 and to be driven by the electric motor 22 and 23 through the driving pulley 27.

Each longitudinal flexible element 24, 25, in this case each belt 24 and 25, has a respective safety counterweight 35.

Such a counterweight 35? positioned, for example, on an ascending-descending portion of each belt 24 and 25.

Such a counterweight 35? it is intended that it can also be positioned in another position.

Such a counterweight 35? configured and positioned in such a way as to cancel, with the electric motors 22 and 23 off, the weight contribution given by the first slides 14 and 15 and by the second slides 18 and 19.

In this way, with the electric motors 22 and 23 off or broken, and the brakes of the electric motors inoperative, no load is placed on the user athlete and his / her safety? ? insured.

The counterweight 35? obviously placed on a portion 24a and 25a of the longitudinal flexible element 24 and 25, or of the belt 24 and 25, where not? present the first slide 14 and 15.

In the present embodiment, the counterweight 35? fixed to the belt 24 and 25 in the section 24a and 25a between the driving pulley 27 and the first upper pulley 28.

The exercise machine 10 comprises a unit? control electronics 90, configured for the control and management of the operation of said motorized transmission means 21.

This unit? control electronics 90? schematized by a box in figure 1.

The electric motors 22 and 23 are preferably, but not exclusively, of the 'brushless' type.

Said electric motors 22 and 23 can be associated with a corresponding torque reducer, to be understood obviously of the type in s? known. The reducer can? be two-stage or three-stage.

In particular, each of the electric motors 22 and 23 comprise an encoder and an integrated brake.

The exercise machine 10 can? also comprise an additional speed transducer, for each of the first slides 14 and 15.

Such an additional transducer? able to directly measure the speed? of the corresponding first slide 14 and 15.

The encoder on board the electric motor 22 and 23 detects the speed? of the first slide 14 and 15 indirectly, on the basis of the speed? rotation of the encoder disk itself.

This additional speed transducer? ? installed on the machine and connected to the unit? control 90.

The exercise machine 10 advantageously also comprises a signaling device 85, schematised in Figures 1 and 8, configured for signaling the gripping and release of said lifting bar 20 by a user, which signaling device? connected with said unit? control electronics 90.

In the present embodiment of the invention, which is not limitative thereof, this signaling device 85 comprises a pair, or alternatively two pairs, of elements, an emitter and a receiver, for example photocells, located at opposite ends. 20a and 20b of the lifting bar 20; for example an emitting photocell? positioned in correspondence of a first extremity? 20a and an opposite reception photocell? positioned on the opposite end? 20b, or vice versa.

The emitter and receiver are positioned on the lifting bar 20, in a position such as to detect the presence of a hand on the same lifting bar 20.

In an alternative embodiment of the invention, schematized in Figure 10, the signaling device 185 comprises at least a pair of elements, an emitter 185a and a receiver 185b, positioned facing each other at a gripping area of the lifting bar 20 so as to detecting the presence or absence on the lifting bar 20 of a single hand of the athlete.

Still in particular, the signaling device 185 comprises two pairs of elements, a first pair of emitter elements 185a and receiver 185b and a second pair of emitter elements 185c and receiver 185d, each pair of elements being positioned so as to detect the presence or minus on the spreader bar of a corresponding athlete's hand.

Such an alternative solution? particularly effective and? insensitive to any bending of the lifting bar 20.

Preferably, and advantageously, the emitter and receiver elements are mounted on the lifting bar 20 with means for adjusting the position along the same lifting bar 20. These means, to be understood of known type, can be a band of plastic material, or a metal sleeve with means for fastening to the bar, or other similar and equivalent reversible fastening means. The possibility? moving the emitter and receiver along the lifting bar 20 makes the signaling device 85 and 185 particularly versatile and easily adaptable to the specific ergonomics of the athlete.

Such a signaling device 85? configured to operate in such a way that the signal, which passes just above the lifting bar, preferably flush with the surface of the lifting bar 20, is interrupted by the closing of the athlete's hand. The signal remains interrupted until the opening of one hand, or both hands, by the user athlete.

When the user athlete releases his grip, for any reason, when the hands are opened, the signal between the emitter and the receiver becomes active again, signaling the interruption of the use of the exercise machine 10.

Preferably all the electronic components are of the 'safetyintegrated' type or intrinsically safe.

The signaling device 85? also connected to the unit? control electronics 90.

The unit control electronics 90 comprises, for example, a PLC.

This unit? control electronics 90? interconnected to the encoders of the electric motors 22 and 23 and through these encoders it receives the signals such as to be able to calculate position, speed? and acceleration of the spreader bar 20.

The unit control electronics 90 includes a human interface system? machine, for example a 'touch' screen panel; through the screen the user athlete intervenes in the management of the motorized transmission means 21, determining the load for the physical exercise of lifting weights.

Through the same screen the user athlete has the possibility? to view and extract the statistics of your training.

The beginning and the end of the execution of one or more? exercises are signaled by means of the signaling device 85, of the 'hands? on ', thanks to which the closing of a hand around the lifting bar signals the start of the execution of an exercise, while the opening, voluntary or involuntary, of both hands forces the stop of the exercise machine 10.

In particular, therefore, the unit? control electronics 90 allows the exercise machine 10, through the action of the electric motors 22 and 23, to replicate the action of the force of gravity. on the spreader bar 20, whose load? decided and set by the athlete using the same unit? control electronics 90.

The unit control electronics 90? configured, and therefore programmed, in such a way that, when the exercise machine 10 is switched on, the initial state of the lifting bar 20, namely its position in particular, is first checked.

Once the user athlete has selected a work load, the lifting bar 20 is positioned, with low speed movements, at a fixed height from the ground.

The user athlete positions himself inside the frame 11 of the exercise machine 10, ready to perform his exercise; the user athlete signals his presence via the signaling device 85 'handson' and performs two repetitions under a minimum load; in this way the machine records the maximum and minimum heights that the balance wheel reaches during the actual exercise. After performing the repetitions under minimum load there? the actual execution of the exercise.

Again through the 85 'hands-on' signaling device, the athlete requests the application of the workload, and starts training.

The unit control electronics 90 detects in real time position, speed? and acceleration of the lifting bar 20, in order to perform the following operations:

- recording and analysis of the athlete's performance;

- detection of any fatigue of the athlete, to whom the exercise machine 10 will have to? make up for with appropriate and calibrated load reductions, in order to allow the safe completion of the exercise; - detection of any dangerous situations, for example collision between the spreader bar and the athlete, fall of the spreader bar, loss of consciousness of the athlete.

The end of the execution of the exercise? signaled by the opening of the athlete's hands, otherwise always gripping the lifting bar 20.

The electric motors 22 and 23, by delivering torque, tension the belts 24 and 25 which, in turn, exert a load on the first vertical slides 14 and 15. This? the athlete's training load. The electric motors 22 and 23, operating according to the signals imposed by the unit? control electronics 90, regulate this load in such a way as to:

- reproduce the contributions of inertia, i.e. the increase and reduction of load that the athlete perceives during the accelerating and decelerating phases of the movement,

- adjust the impressed load, i.e. the torque delivered, in case of athlete fatigue; this phase? optional, at the athlete's choice, and? selectable through the man-machine interface, or through the 'touch' panel of the unit? control electronics 90;

- suddenly stop the lifting bar 20 in the event of a danger signal.

The unit control electronics 90 detects the athlete's presence through the 'hands-on' signaling device 85, and also detects? the position, the speed? and the acceleration of each electric motor 22 and 23 by means of the respective encoders on board.

Are these signals recorded and stored by the unit? control electronics 90 throughout the execution of the exercise.

The unit control electronics 90? configured in such a way as to compare, between a repetition and the previous ones, position and speed? to evaluate if the athlete is getting tired, and if he can? then to complete the exercise independently; in case of detected fatigue the unit? control electronics 90 commands the electric motors 22 and 23 to reduce the load.

To ensure the safety of the athlete, the unit? control electronics 90? configured in such a way as to check at all times:

- the signal of the signaling device 85 and if the signal is canceled does it mean that the athlete has lost the spreader bar 20 or? passed out,

- the position of the spreader bar 20, so that if it falls below the lower dead center PMI, it is crushing the athlete's body,

- the speed? of the lifting bar 20, so that if it? high in the vicinity? of the lower dead center PMI the athlete will not be able? to avoid collision with the lifting bar 20 itself, and the descending acceleration of the lifting bar 20, so that if it goes beyond a certain fraction of g it means that the balance wheel is falling free.

A method of operation of the exercise machine 10 according to the invention? described below, and? schematized in figure 9. This method of operation provides for the following operating phases: - start-up of the machine, indicated in figure 9 with block 100;

- a preparation phase, comprising the sequence of actions 200: - positioning of the barbell, in which the barbell is brought to a height established by the athlete; the data of the starting altitude? inserted through the unit? control electronics 90 by the user athlete; such positioning? performed by the exercise machine 10 at low speed; in addition, the athlete selects the type of exercise and the workload; this phase? schematized by block 101;

- activation of the 'hands-on' signaling device 85; in this phase the user athlete, ready to perform the exercise, grabs the lifting bar 20, thus activating so? the signaling device 85 which signals the presence of a hand on the lifting bar 20, enabling the possibility? for the user athlete to perform the exercise; this phase? schematized by block 102;

- at least two, preferably three, empty repetitions of the movements of the exercise by the user athlete, in order to teach the unit? control electronics 90 the position of the top dead center TDC and of the bottom dead center PMI of the stroke of the spreader bar 20, i.e. the points of maximum and minimum distance from the ground that the spreader bar 20? waiting to reach during the exercise; this phase? schematized with block 103;

- reading of values; the unit? control electronics 90 detects the activation of the signaling device 85 'hands-on', indicated by the symbol 'h', the position x, the speed? x 'and the acceleration x' '; this phase? schematized by block 104;

- analysis of the repetitions and verifies that the repetitions performed are regular, or that the repetitions have similar PMI and similar PMS; this phase? schematized by block 105;

- if the previous phase of analysis detects the regularity? of the repetitions, control block 106, then the user athlete releases the lifting bar 20, allowing the signal to pass through the signaling device 85; this phase? schematized by block 107;

- if the previous phase of analysis does not reveal the regularity? of the repetitions, control block 106, then the user athlete performs the repetitions referred to in block 103 again;

- after releasing the lifting bar 20, there? positioning of the spreader bar at the top or bottom dead center, at the athlete's choice; this phase? schematized with block 108.

With this phase the preparation phase 200 ends.

The preparation phase 200 is followed by the training phase 300.

Said training phase 300 comprises the following operating phases: - actuation of the 'hands-on' signaling device 85; in this phase the user athlete, ready to perform the exercise, grasps the lifting bar 20, interrupting the signal between the emitter and the receiver and thus activating? the signaling device 85 which signals the presence of a hand on the lifting bar 20, enabling the possibility? for the user athlete to perform the exercise; this phase? schematized by block 109;

- load application, i.e. the electric motors 22 and 23 deliver torque and reach the training load, including inertial contributions; this phase? schematized by block 110;

- reading of the parameters of position x, speed? x ', acceleration x' ', and time t, following the activation of the exercise machine 10 by means of the signaling device 85' hands-on ', that is the unit? control electronics 90 detects the interruption of the signal between emitter and receiver of the signaling device 85, indicated by the symbol h, and also detects? the position x, speed? x 'and acceleration x' 'of the lifting bar 20, and the time t of execution of the exercise; this phase? schematized by block 111;

- data saving, or the unit? control electronics 90 stores the information; this phase? schematized by block 112.

The training phase 300 comprises a cycle of safety operations 400 which is always iterated up to the stop phase 116 at the end of the exercise.

This cycle of security operations 400 includes the following operational phases:

- checking the presence of at least one hand of the athlete on the lifting bar 20 by means of the signaling device 85; this phase? schematized by the control block 113;

- if the signaling device 85 signals the absence of hands on the lifting bar 20, then? data saving, block 114, and stopping of the machine, block 116 performed;

- if the signaling device 85 signals the presence of hands on the lifting bar 20, then it is verified whether the dimension x of the lifting bar? above or below an athlete's body crushing threshold Xs; this phase? schematized by the control block 115;

- if the x dimension of the lifting bar? below a threshold value Xs for crushing the athlete's body, then the data saving, block 114, and the stop of the exercise, block 116 are carried out;

- if the x dimension of the lifting bar 20? above the threshold value Xs, and therefore the exercise is proceeding within the predetermined safety limits, then it is verified if the speed? descendant x 'of the spreader bar 20? greater than a threshold value Xs'; this phase? schematized by the control block 117;

- if the speed? descendant x '? higher than Xs', then the data saving, block 114, and the stop of the exercise, block 116 are executed;

- if the speed? descendant x '? lower than Xs', and therefore the exercise is proceeding within the predetermined safety limits, then it occurs if the descending acceleration x '' of the lifting bar 20? higher than a threshold value Xs '' for the fall of the lifting bar 20; this phase? schematized by the control block 118;

- if the descending acceleration x ''? higher than Xs '', then the data saving, block 114, and the stop of the exercise, block 116 are executed;

- if the descending acceleration x ''? lower than Xs '', then the exercise continues from block 110, or an auxiliary phase 500 intervenes for a possible reduction of the operating load.

This auxiliary phase 550 includes the following operational phases:

- checking the x position of the lifting bar 20 with respect to the XPMI position of the lower dead center, control block 119;

- if position x? above XPMI then it checks if the speed? x 'of the lifting bar 20 falls below a threshold value Xs' close to zero before TDC, control block 120;

- if the position x does not return above XPMI then it is verified if the residence time t in correspondence of the PMI? higher than a TPMI threshold value, i.e. it is checked whether the athlete is able or unable to bring the load upwards; this phase? schematized by the control block 121;

- if the speed? x 'of the lifting bar 20 falls below a threshold value Xs' close to zero before TDC, then a load reduction occurs, block 122;

- if the time t of staying in correspondence of the PMI? higher than a TPMI threshold value, then a load reduction occurs, block 122.

When the load? reduced, the training phase 300 resumes from block 110.

The unit control electronics 90? therefore configured to reduce the load in predetermined circumstances and to interrupt the exercise, storing in any case the data of the exercise.

The load reduction can? have a limited duration, in fact very often the athlete, after a minimum help, is able to independently resume the execution of the exercise, or can he? be permanent, for example, in particular, if the load shedding? already? occurred more? times during the same exercise.

Yup ? in practice it has been observed that the invention achieves the intended aim and objects.

In particular, with the? Invention? development of a safe exercise machine and what can? be used by an athlete without assisting wingmen present in case of need, since? the same motorized means of transmission 21, governed by the unit? control electronics 90, apply the load to the lifting bar 20 and retain the same in case of injury or fatigue of the athlete. Furthermore, with the invention you? development of an exercise machine that allows to eliminate the dead times of replacing, removing or adding loads, typical actions of the use of the barbells known today, since this exercise machine has no masses to replace, add or remove.

In addition, with the invention, yes? development of an exercise machine capable of detecting with continuity? and accuracy of the athlete's performance.

The invention so? conceived? susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept; moreover, all the details can be replaced by other technically equivalent elements.

In practice, the components and materials used, provided? compatible with the specific use, as well as? the contingent shapes and dimensions may be any according to requirements and to the state of the art.

Where the characteristics and techniques mentioned in any claim are followed by reference signs, these reference signs are to be understood as affixed for the sole purpose of increasing the intelligibility. of the claims and consequently these reference signs have no limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims (10)

CLAIMS 1) Exercise machine for weight lifting (10), characterized by the fact of including: - a supporting frame (11), - two opposite first lateral guides (12, 13), ascending-descending, developing according to a first direction (X1), - two first slides (14, 15) each slidingly constrained on a corresponding first lateral guide (12, 13), - two opposite second lateral guides (16, 17), developing according to a second direction (X2) transversal to said first direction (X1), and each defined on board one of said first slides (14, 15), - two second slides (18, 19) each slidingly constrained on a corresponding second lateral guide (16, 17), - a lifting bar (20), each of the ends (20a, 20b) of said lifting bar (20) being constrained to a corresponding second slide (18, 19), - motorized transmission means (21) configured for the application on said first slides (14, 15) either of an opposition force to an upward thrust force, or of a downward traction force. 2) Exercise machine according to claim 1, characterized in that said motorized transmission means (21) comprise at least one electric motor (22, 23) configured to drive a flexible element with longitudinal development (24, 25), which flexible element with longitudinal development (24, 25)? connected to a first extremity? to the lower part (14a, 15a) of a first slide (14, 15), and to the second extremity? opposite ? connected to the upper part (14b, 15b) of the same first slide (14, 15). 3) Exercise machine according to the preceding claim, characterized in that there are present, for each flexible element with longitudinal development (24, 25): - at least one lower pulley (26) configured and positioned so as to deviate a flexible element with longitudinal development (24, 25) coming from a said electric motor (22, 23) towards a said lower part (14a, 15a) of a said first sled (14, 15), - at least one upper pulley (28, 29, 30, 31) configured and positioned so as to deviate a said flexible element with longitudinal development (24, 25) towards an upper part (14b, 15b) of a said first slide (14, 15). 4) Exercise machine according to one or more? of the preceding claims, characterized in that said motorized transmission means (21) comprise two electric motors (22, 23), each of which is configured to drive a corresponding longitudinally extending flexible element (24, 25). 5) Exercise machine according to one or more? of the previous claims, characterized by the fact of including a unit? control electronics (90) of the operation of said motorized transmission means (21). 6) Exercise machine according to one or more? of the preceding claims, characterized in that said electric motors (22, 23) are of the 'brushless' type. 7) Exercise machine according to one or more? of the preceding claims, characterized in that each of said electric motors (22, 23) comprise an encoder and an integrated brake. 8) Exercise machine according to one or more? of the preceding claims, characterized in that said flexible elements with longitudinal development (24, 25) comprise a belt, a chain, a rope or other similar and equivalent elements. 9) Exercise machine according to one or more? of the preceding claims, characterized in that it comprises a signaling device (85) of the gripping and release of said lifting bar (20) by a user, said signaling device (85) being connected with said unit? control electronics (90). 10) Exercise machine according to one or more? of the preceding claims, characterized in that each longitudinally extending flexible element (24, 25) has a safety counterweight (35).