RU2372184C2 - Electrically driven tool - Google Patents

Abstract

FIELD: mechanical engineering and metal working. ^ SUBSTANCE: invention relates to electrically driven tool, its drive comprising movable shuttle (10) connected to striker (13) and drive motor incorporating at least two, assemblies (8, 9) of electromagnetic frames interacting with aforesaid shuttle. The latter is arranged to move along frames (8, 9). Note that each aforesaid frame incorporates electric coils (15) to induce magnetic field across shuttle (10) and control unit to control current in coils (15) which generates required force to move shuttle (15). Frame assemblies (8, 9) induce magnetic field, directed, in fact, across shuttle motion. ^ EFFECT: reduced sizes, economic current consumption from battery. ^ 16 cl, 12 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to a tool with an electric drive for fasteners, containing a movable shuttle (clamshell mechanism) attached to the face, and a drive motor having at least two assemblies of electromagnetic yokes (brackets, deflecting devices) in communication with the above shuttle, which is located with the ability to move relative to the above yoke assemblies, each yoke assembly has electric coils to create a magnetic field in the shuttle, and a control unit that controls t current in the coils to create a magnetic field, so that a force is generated to move the above shuttle.

BACKGROUND OF THE INVENTION

A nail, button or bracket is used to connect parts from different types of wood or other soft materials, and a nail, button or bracket is used as suitable fasteners. A hammer may be used to hammer a nail, button or staple. In industrial applications, a tool for reinforcing buttons or staples is used to drive these fasteners.

Typically, a tool to strengthen buttons or staples uses compressed air as a driving medium. Compressed air, as a rule, is available only in production rooms, since a compressor is required to compress the air, as well as a distribution system for compressed air. The distribution system, as a rule, consists of steel pipes, and at the ends of the pipes in the system are pressure reducing valves with an air cleaner and an adapter for the fastening connection.

A tool for fastening buttons or staples is usually a portable tool, and therefore needs a rubber hose between the tool and the connection point at the end of the distribution system.

The advantage of tools using compressed air is that they are small and lightweight. Their disadvantage is that they need compressed air, and this does not happen often. Usually they exist only at manufacturing enterprises. If a button-tightening tool or a stapler (stapler) is a portable tool, it also requires a long and bulky hose between the tool and the connection point so that the operator can move freely.

Some other solutions have been patented to avoid the disadvantages described above. There are patents in which instruments are used that use electricity to drive an electric motor that will tension a spring (US Pat. These devices use electrical energy when the unit is connected using an electrical cord to a power outlet. In other cases, wireless gas solutions are used to drive the combustion unit (US Pat. No. 5,720,423).

A battery-powered tool is known having batteries supplying an electric motor that will accelerate the flywheel, and when the flywheel has sufficient energy, it will attach to the linear actuator via a clutch system (US Pat. No. 6,607,111). The drawback of the flywheel is that its acceleration will take several seconds, and this will limit the frequency of fastening nails or staples.

The new direction for portable tools, such as screwdrivers, drilling machines, jigsaws, is the use of battery power. Therefore, there have been recent developments in batteries, and batteries have become smaller, lighter and more powerful.

US Pat. No. 4,618,087 describes one or two coils that will pass currents from 110 to 220 50/60 Hertz. According to US Pat. No. 4,618,087, a round rod or shuttle is used and the coil is wound around the rod with an air gap between the inner surface of the coil and the rod. When the coil is excited, a magnetic field is created in the same direction in which the rod moves, i.e. in the longitudinal direction of the rod, and the rod will be pulled into the coil to fill the inner space of the coil. When the rod takes up its initial position in front of the coil, the magnetic field is directed from one end of the coil to the other end, and this type of coils will therefore be called air coils. Air coils, as a rule, have only 40% efficiency, relatively low. Therefore, this type of solution is not suitable for battery operation.

US 2004/0084503 discloses a nail clogging installation with a hammer, first and second solenoids, and a control unit. The installation is designed so that a second solenoid can be turned on to drive the hammer after the first solenoid.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an improved tool for securing elements, which can be portable and battery powered, and which does not have the disadvantages of the prior art.

The problem is solved by creating a tool of the type mentioned above, which is characterized in that it is equipped with yoke assemblies for creating a magnetic field that is directed essentially perpendicular to the direction of movement of the above shuttle.

The present invention relates to a portable tool for reinforcing battery-powered buttons or brackets. A tool for strengthening buttons or staples consists of a linear drive motor with an electric drive controlled by a microcomputer unit, a battery as a power source and a traditional system for supplying nails or staples.

A linear drive motor uses many electromagnetic yokes and a shuttle moving between the magnetic poles in these yokes. The shuttle has an energy absorbing spring at one end, which will compress when the shuttle moves back, and a downhole pin at the other end to drive a nail, button or staple into its base.

The present invention can be implemented in the form of a new type of cordless portable tool for inserting buttons or staples, which takes advantage of new developments in batteries and new types of microcomputer technology to create an electric linear drive motor for inserting a nail, button or staple into its base.

Compared with known devices, it can be noted that the invention uses a magnetic yoke consisting of layered magnetic soft iron, and the magnetic field extends perpendicular to the direction of movement of the rod or shuttle along the ring of soft iron in the shuttle. Thus, the magnetic field will move inside the iron except for two very small air gaps between the yoke and the shuttle. This type of magnetic design can be called iron core coils and will have 80% or more efficiency depending on the size of the air gap.

Other advantages of this type of construction are the high mechanical density in the direction of movement of the shuttle, and since the tool for fastening the brackets requires several yokes to create the necessary power to hammer a larger nail or staple, the density of placement is important. If you need to use several air coils, the tool as a whole will become longer, and since it is portable, the overall size of the tool is also important. Equipping the motor with a yoke and a shuttle also provides the advantage of being able to hammer in a lot of nails or staples per second.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is further explained in the description of the preferred embodiments with reference to the accompanying drawings, in which:

Figa and B depict a General view and side view of a tool for strengthening buttons or staples powered by a battery according to the invention;

Figa and In depict a General view and side view of a linear drive motor with a shuttle according to the invention;

3A and B show an exploded general view and front view of a magnetic yoke with coils and a spacer made of non-magnetic material to the next yoke according to the invention;

Figa, b and C depict two General views and one side view of the shuttle with an iron core, separated by spacers. The shuttle will have a blocker at one end and an energy absorbing spring at the other end according to the invention;

Figa, b, C and D depict views that show the relationship between the iron core of the shuttle, the magnetic poles in the yoke and the chronographic scale at the start and end points for the passage of current through the coils according to the invention;

6 depicts a chronographic diagram of the increase and decrease of different yoke coils according to the invention;

7 is a shuttle retraction force diagram showing a relationship between a motor force and a spring force according to the invention;

Fig. 8 is a diagram of the impact force of the shuttle showing the relationship between the forces of the motor and the spring and the force curve for introducing a 65 mm long nail into a conventional wooden base according to the invention;

Fig.9 depicts the relationship between shuttle speeds, retraction and shock movement according to the invention;

Figure 10 depicts an electrical circuit used in an alternative embodiment of the present invention, according to the invention;

11 is a side view of an alternative embodiment according to the invention;

12 is a side view of an alternative embodiment according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

On figa and b shows a General view and side view of a tool for strengthening buttons or staples powered by a battery according to the invention, containing a rechargeable and replaceable battery 1 on one side of the handle 3, and on the other side is a linear drive motor, with a shuttle (not shown in FIGS. 1A and B) inside the housing 4. The movement of the shuttle begins by activating the starter 2, and as a result, the shuttle will move from its lowest position to its upper position and vice versa. During this movement, one nail, button or bracket in the supply cassette 5 will move forward to the downhole (working) rail 6, and the downhole, located in front of the shuttle, will be directed into the downhole rail and hammer the nail, button or bracket into its base. A display 7 is located on top of the housing 4, and it will inform the operator about the different state of the tool, for example, that it is time to replace the battery, or that there are no nails, buttons or staples in the supply cassette, or display other useful information.

On figa and b shows a General view and side view of a linear drive motor, which is located in the housing 4 of the tool for securing the brackets mentioned above. The motor is made up of two types of yoke assemblies, more precisely the first 8 yoke assembly and the second 9 yoke assembly. As shown in detail in FIGS. 3A and 3B, the yoke assemblies 8, 9 are equipped with coils 15 at 10:00 and 16:00 o’clock (that is, at the first assembly 8 yokes), and coils 15 at 8:00 and 14: 00 by the hour (that is, in the second assembly 9 yokes). Two types of yoke assemblies are arranged one after the other, with 8 yoke assemblies of the first type alternating with 9 yoke assemblies of the second type. 2A or B show four yoke assemblies, but the motor may consist of a unit including a different number of yoke assemblies, depending on what kind of shock energy the motor should provide. A shuttle 10 is located in the center of the motor, and the shuttle is guided by a central hole into the spacer portion 17 of the yoke assembly (Figs. 3A and B). Two screws 11 hold the yoke assemblies together (only one screw is visible in the drawing), and the yoke assemblies are aligned with each other to facilitate the flawless direction of the hook 10. In FIGS. 2A and B, the front plate is removed so that yokes 16 and coils 15. In FIGS. 2A and 2B, the face 13 is connected to the lower end of the shuttle, and now the shuttle is in its initial position when the face 13 rests on the lower end of the bottom rail 6. In this position, some of the iron cores 12 of the shuttle are located directly in front of the yokes 16 in assembly of yokes so that ensure the possibility of moving the magnetic field generated by the coils 15 through the yoke by an air gap of 0.05 to 0.1 mm between the pole surfaces (shoe) of the yokes 19 and the iron core 12 of the shuttle. When the magnetic field passes through the air gap, a force is created to move the shuttle forward to the motor to align the iron core 12 of the shuttle inside the yoke 16. When the iron core 12 of the shuttle is aligned inside the yoke 16, the current through the coils 15 is turned off and the magnetic field ends, and this yoke is larger will not generate power to move the shuttle.

The motor has several yokes, and always almost 50% of its yokes will be activated, as soon as one yoke finishes work, a new yoke begins. Now the shuttle will move back to the motor, and thus will compress the energy absorbing spring 14, and the spring 14 will transform the kinetic energy from the shuttle movement into static energy, which can be used by the shuttle in shock motion.

On figa and b presents a General view and front view of one assembly of the yoke. The yoke assembly consists of a spacer portion 17 made of a non-magnetic material with good supporting properties to maintain a hole in the center. At the top of the strut 17 are two c-shaped yokes 16 located facing each other. The yokes 16 are made of several magnetic sheet metal plates laminated to each other to form each yoke. A coil 15 is equipped on each yoke, and one or two additional laminate plates 20 are located between the coil and the yoke so that the area inside the coil is equal to the area of the pole surface 19 of the yoke. The use of additional magnetic plates 20 depends on whether the magnetic field inside the yoke is saturated or not.

The two yokes 16 are arranged so that the four pole surfaces 19 form a circle that is concentric with the support hole in the center of the strut 17. After the four pole surfaces in two yokes were positioned properly relative to the central hole in the strut 17, the two yokes are fixed with four fasteners 18. The diameter of the circumference of the pole surfaces is approximately 0.1-0.15 mm larger than the diameter of the central support hole in the spacer 17. This difference creates an air gap between the iron core 12 people eye and the pole surfaces 19, when the shuttle 10 is guided bearing hole in the spacer 17.

FIGS. 4A, B and C show two general views and a side view of the shuttle 10 with the chaser 13 and the return spring 14. The shuttle can be composed in several ways, but this drawing shows a tube 21 made of a non-magnetic material, such as aluminum or stainless steel.

On the perimeter of the tube, several magnetic sheet metal parts are docked with the iron core 12 of the shuttle, and between the iron cores 12 of the shuttle are shuttle struts 22 made of non-magnetic material to ensure proper separation between the iron cores of the shuttle. The entire shuttle block is held together by a stop 26 at one end of the tube 21 and a nut 24 at the other end, whereby the elements of the layered block can be pressed against each other. The layered iron core 12 of the shuttle will act as a bridge for the magnetic field to move from one pole surface 19 through the air gap to the next air gap and the pole surface in the first and second assemblies 8 and 9 of magnetic yokes. As long as the iron core 12 of the shuttle is on its way into the yoke, the magnetic field will pull the iron core of the shuttle in order to align it inside the yoke assembly.

To one end of the tube 21 is attached the slayer 13 by means of mechanical fasteners to hold the slaughter in a certain position relative to the shuttle. The blocker 13 may be directed into the tube so that it is easier to direct the blocker into the bottom hole rail 6 when the shuttle is on its way down to hammer a nail, button or bracket. A spring 14 is located on the other side of the tube 21, at least partially inside the tube, and one end of the spring will rest on a stop inside the tube, for example, on the end of the hammer 13, or some other stop. The other end of the spring will rest on the surface of the upper housing cover 4. The pin attached to the upper housing cover 4 will extend downward inside the spring 14 to guide the portion of the spring that is not guided by the tube 21.

In FIG. 4C, the last shuttle spacer 22 is removed in order to show additional iron parts of the shuttle 25, which will add an extra compartment to the iron core of the shuttle, so that the iron core of the shuttle will have the same area as one pole surface. The magnetic field path must have the same area as the pole surfaces to avoid unnecessary restrictions on the magnetic field flux depending on the field saturation.

A chronographic scale 23 is equipped along one side of the shuttle case. The main task of the chronographic scale is to indicate the sensors (which will be described below) located between the yokes inside the struts 17, where the shuttle is located, with respect to different yokes. At the same time, signals from sensors can be used to calculate the shuttle speed. The second function of the chronographic scale 23 is to prevent the shuttle from rotating around its central axis to avoid reducing the magnetic area in the iron core of the shuttle using the grooves in the assembly holding the chronographic scale.

5A, B, C and D show the initial position and the stop position, and the relationship between the chronographic scale 23 and sensors 27, for example, containing a beam of light in communication with the detector. Several chronographic concepts may be used, but these four drawings explain one of many different possible concepts.

In Fig. 5A, the shuttle 10 is in its initial position for reverse movement, and for simplicity, only two yoke assemblies are shown, i.e. the first assembly is 8 yokes and the second assembly is 9 yokes. The iron core 12 of the shuttle is located in front of the yoke 16 assembly 9 yokes. The distance between the iron core 12 of the shuttle and the yoke 16 is approximately 0.8 to 0.5 mm. At this moment, the beam of light 28 generated by the sensor 27 located on the spacer 17 shines through the window 29 in the chronographic scale 23, and the signal instructs the logic circuits in the control unit (not shown) to start the excitation of the coils 15 in the assembly of 9 yokes. When the coils are energized, a magnetic field is created that will pull the shuttle 10 into the position of FIG. 5 B. In FIG. 5B, the shuttle 10 and the iron core 12 of the shuttle have been moved to a position in which the iron core 12 of the shuttle is aligned with yoke 16, and at this moment, the window 29 closes the beam of light 28. In the absence of a signal from the sensors 23, the magnetic field will weaken, and the shuttle will continue to move by inertia by 0.1-0.2 mm to the position shown in Fig. 5C. In Fig. 5C, the next iron core 12 of the shuttle is in front of the yoke 16 of the first assembly of 8 yokes, and a ray of light 28 from another sensor 27 in the first assembly of 8 yokes will shine through the next window 29 in the chronographic scale 23. The new sensor 27 will now show the logic diagrams that it is time to initiate the first assembly of 8 yokes, and the magnetic field will stretch the shuttle 10 to the position of Fig.5D. In FIG. 5D, the iron core 12 of the shuttle was moved to yoke 16 in the 8 yoke assembly, and the window 29 would cover the beam of light 28, and the magnetic field in the 8 yoke assembly would be turned off. At this point, the process will again begin with Fig. 5A. If now the structure has more yokes, for example four, six or eight yokes, some yokes will be switched on in parallel, but in a checkerboard pattern.

Fig. 6 shows a chronographic curve for four yokes similar to the design of Figs. 2A and B. Four yokes are called letters A to D, and yoke A represents the lower curve, yoke B the second curve, yoke C the third curve, and finally yoke D on on top. At the zero point of the yoke, D and C are turned on, but when the yoke C decreases, the yoke A increases, and when the yoke D decreases, the yoke B will increase. Thus, different yokes will increase and decrease in a checkerboard pattern. Sometimes, when one yoke decreases and the next increases, this will move the shuttle by 0.1-0.2 mm between increase and decrease. If the motor is equipped with six or eight yokes, the chronograph diagram will be the same, but three or four yokes will increase simultaneously, but in a checkerboard pattern, as in FIG. 6.

Other chronographic concepts may be used. In Figure 5, only two yokes were used, but instead of yoke 8, two to three yokes can be mechanically arranged so that they work in parallel. If, for example, four yokes are equipped, then two yokes will increase at the same time. The other two yokes also increase at the same time, but after the first two decrease.

FIG. 2B shows the shuttle 10 in its lower position, which means that the end of the face 13 is aligned with the lower end of the downhole rail b. On command from the starter 2, the motor begins to move the shuttle 10 back, and the force generated by the motor must be greater than the force of the spring 14, in order to make the shuttle move. 7 shows two curves, one of which represents the force of the motor, and the other the force of the spring. At the beginning of the motor operation, the spring has an initial force of 120 N, and the motor has an average force of 200 N. The shuttle begins to move, and the speed increases to 4.1 m / s after 85 mm of movement. At this point, the spring curve intersects the motor curve and the speed will decrease close to zero after 140 mm movement. All movement backward will be 54.4 milliseconds in time. In the upper position of the shuttle, the spring 14 is fully compressed and located inside the shuttle 10, and at this moment the shuttle stops and immediately begins to move forward. Figure 8 shows forward movement or shock movement, and now two forces are shown moving the shuttle forward, the force of the compressed spring and the force of the motor. The motor power drops below 200 N at a speed of 6 to 10 m / s due to the rise time constraints for the current passing through the coils 15, and also depending on the thickness of the yoke 16 and other motor parameters. For this reason, a drop in the motor power curve occurs.

In this model, it is accepted that the tool for strengthening the buttons needs to hammer a 65 mm long nail in one bypass and shock stroke of the shuttle. Figure 8 shows that an energy of 40 J is required for driving a nail 65 mm long, 40 J corresponds to an increase in force from 0 N to 514.9 N after penetration of the nail by 10 mm, and ends 754.9 N after the complete penetration of the nail at its base. The shuttle starts the shock cycle, and the speed increases to 11.7 m / s while it hits the nail, and after that the speed slows down to 1.4 m / s, which means that the nail will become clogged in just one retraction cycle and hit. The total impact cycle is 21.3 milliseconds, and the retraction cycle is 54.5 milliseconds, which means that the total time is 75.8 milliseconds.

Figure 9 shows the speed of the shuttle relative to the position of the shuttle. The retraction speed depends on the weight of the shuttle, the strength of the motor and the strength of the spring. The shuttle will reach speeds from 4 to 8 m / s at maximum and slow down to zero m / s in the upper position. In the shock cycle, it is important to achieve the highest possible speed, and this depends on the same parameters as the retraction cycle, as well as on the fall of the motor curve. The typical highest speed will be from 10 to 15 m / s immediately before the impact between the hammer 13 and the nail, and after that it decreases to zero m / s. Since the tool for strengthening the buttons is equipped with a microcomputer that controls the time distribution and the shuttle speed, it can determine that the motor needs to reduce force at the end of the cycle to prevent the nail from penetrating too deep into the base. If the opposite happens, i.e. the microcomputer detects that the shuttle speed is too slow to completely hammer the nail; it is unable to increase the power of the motor or spring. To overcome this problem, he can immediately begin to retract the shuttle a second time after he stopped, and depending on how many millimeters the nail remains to penetrate, he will retract the shuttle for a sufficient amount, and from this position make a second shock cycle for further moving the nail down to the base. This can happen because the impact energy of 40 J is designed for normal wood material, but if you need to hammer a nail, for example, into a harder type of wood, one shuttle cycle may not be enough to move the nail the entire length to its base. Therefore, it is important to have control over the speed of the shuttle and determine the need for a second shock cycle or the need to reduce speed by reducing the power of the motor to control clogging of a nail, button or staple in its base.

The size and cost of the motor and the tool spring to strengthen the buttons or staples can be reduced if hammering of a nail, button or staple is based on at least two or three shuttle cycles. One cycle will take about 75 to 100 milliseconds, two full or almost full cycles will not take more than about 150-200 milliseconds. Since two cycles are carried out in a very short period of time, the operator is not able to determine if one, two or three cycles were used to hammer a nail, button or staple. With this concept, one size tool for reinforcing buttons or staples can cover a wider range of different nails, buttons or staples. If the double-strike concept is used, it is important that the microcomputer reliably controls the shuttle speed and that the shuttle can start backward movement from any stop position, since the nail, button or staple can stop anywhere after the first blow, depending on the hardness of the base material . If the microcomputer knows how many millimeters the nail, button or bracket should be moved a second time, it can calculate how long it takes to pull the shuttle a second time to create the necessary amount of energy to drive a nail, button or staple in a second motion.

After the shuttle hammered a nail, button or bracket into its base, it will remain in its original position. In the initial position, the energy absorbing spring will exert a slight pressure on the shuttle to hold the shuttle in that position.

If the tool operator now needs to hammer in a nail, button or bracket, the linear motor starts moving the shuttle back and compressing the spring. At the highest point or in the retracted position of the shuttle, the spring is compressed, and all kinetic energy from the reverse movement of the shuttle is stored in the spring. From the allotted position, the shuttle immediately starts forward or shock movement and is accelerated to high speed using a linear motor and a compressed spring. During the shuttle and impact movement of the shuttle, the nail, button, or staple feed system will feed a new nail, button, or staple into the downhole rail. The shuttle reaches its maximum speed just before the stinger strikes the nail, button or staple, and the kinetic energy of the shuttle will be converted into a force that, together with the force of the spring and motor, makes up the total force that will move the nail, button or staple to the base.

According to another embodiment, the invention can be constructed as follows. If the shuttle’s shock energy is not enough to place a long nail or staple in its base, the shuttle will immediately begin a new reverse movement and make a second shock motion to hammer the nail or staple a second time, or maybe even several times.

If a long nail or staple has not been hammered after several shuttle movements, the tool may fail and inform the operator that something is wrong.

The linear motor that powers the shuttle consists of at least two electromagnetic yokes made of soft layered magnetic iron. The yokes are spaced one after another with the same distance or different distance depending on the chronographic concept. The number of yokes depends on the generated energy, which is required from this tool to strengthen the buttons or staples. Each yoke has one or two electric coils connected through a powerful transistor to the battery. The yoke has two magnetic poles, and between these poles the shuttle moves with an adjustable air gap between the poles and the shuttle.

The shuttle also has several soft layered magnetic iron cores spaced at a constant distance from each other. When the iron core of the shuttle is on the way to the entrance between the two poles in the same yoke, a powerful transistor will open, and current will pass through the coils, and a magnetic field will be created inside the yoke. The magnetic field will now pass from the north pole in the yoke through the air gap, through the iron core in the shuttle, through the second air gap, to the south pole of the yoke. As long as the iron core of the shuttle is on its way between the yoke poles, a magnetic field in two air gaps on each side of the iron core of the shuttle will create a forward force to move the shuttle. At the moment when the iron core of the shuttle is aligned with the pole surfaces in the yoke, the powerful transistor will close and no magnetic field will be generated inside the yoke.

If the motor, for example, has four yokes called A, B, C, and D, the time distribution of the yokes will be A / D, A / B, B / C, and C / D, and then the time distribution will be repeated again. If the separation of yokes and iron cores in the shuttle and the timing is correct, approximately 50% of all yokes will be activated to create a force that propels the shuttle forward.

The shuttle may have the design of a long round or rectangular rod with soft layered iron cores of approximately the same width as the width of the pole surfaces.

In an alternative design, permanent magnets in the shuttle may be used in place of soft layered magnetic iron cores. If permanent magnets are used, it is possible to use up to 100% yokes at a time if the drive transistors for the coils on the yoke can conduct current in both directions through the coil. If the direction of the current can alternate between the north and south poles in the coil, this alternation will pull the shuttle magnet into the air gap and push the shuttle magnet out of the air gap.

The spacing of these soft magnetic iron cores must be in a certain ratio with the spacing of the yokes to achieve the optimal number of yokes excited simultaneously during the shuttle movement. The shuttle will be guided in the support system with high accuracy relative to the yokes to maintain a proper air gap between the iron cores in the shuttle and the pole surfaces in yokes, a typical air gap should be from 0.05 to 0.1 mm. The spring in the hook can partially be directed inside the hook and partially with the help of some guide rod in the tool body. On the opposite side of the shuttle is a small rectangular rod made of hardened steel in the form of a face, which will be guided into the face rail, in which a nail, button or staple is located to hammer a nail, button or staple. The cutter is attached to the hook with some shock absorbing materials to reduce impact loads.

There is a chronographic scale on the shuttle, and between some yokes there are several sensors that can operate in accordance with their optical or magnetic operating principles. The sensors will generate many electrical clock pulses that determine the physical position of the shuttle with an accuracy of +/- 0.1 mm, which serves as an input signal to the microcomputer.

According to alternative embodiments, the sensor may be in the form of a light source (eg, a light emitting diode or laser) that communicates with the photodetector, or may be in the form of an inductive detector.

The task of the microcomputer in the first place is to open and close the powerful transistors that control the supply of current to the coils, based on the input signal from the shuttle sensors. Secondly, the computer will preferably check some facts, for example, whether a long nail or a staple has gone all the way to its base, or if a second shuttle movement is needed. He will also check if a nail, button or bracket is located in the downhole rail, battery charging status and other facts.

To manage all these activities, a program is stored in the memory of the microcomputer. This program can be updated or changed by replacing the storage device, which makes it possible to change the nature of the tool when changing the feeding system from feeding nails to feeding staples, or with some other changes. The program can also be updated depending on the type of base for which the tool should be used.

The operator can be informed through the display or using the sound information system in the tool about the data from the program.

Energy is needed to hammer a nail, button or staple into its base, and this energy will come from a battery attached to the tool to strengthen the button or staple. The battery will also be the power source for the microcomputer and sensors.

The battery may be a nickel metal hydride, lithium ion or lithium polymer type. The two most important parameters of the battery are a high power content per gram of weight, and a high output current during shuttle movement. The battery will be rechargeable and easily replaceable. The energy reserve in a conventional battery will allow several thousand strokes to be made before the time comes to recharge.

The battery output can also be connected in parallel to the capacitor to protect the battery from damage by high current output during one shuttle movement operation.

An alternative construction of the invention will now be described with reference to FIGS. 10-12. In the above alternative design, permanent magnets in the shuttle (rotor) 10 'are used instead of soft layered magnetic iron cores. Permanent magnets are preferably located along the longitudinal direction of the shuttle, as shown in FIGS. 11 and 12. Preferably, the shuttle also contains steel washers (see designation in FIG. 12). Also, when permanent magnets are used, the assembly of 8 'yokes is implemented differently.

The drive 30, which converts direct current to alternating current, may be of a three-phase type, as shown in FIG. 10. The drive consists of six power switches that switch the current between the positive terminal 31 and the negative terminal 32. The positive and negative terminals 31, 32 are connected to the respective positive and negative poles of the DC battery. Using a three-phase connection 33 from the drive to the motor, the different shoulders of the drive are connected to the linear motor 34.

In the case of a shuttle (rotor) with permanent magnets, the assembly 8 'of the yoke of the motor can be U-shaped from layers of iron divided into different layers 40, 41, 42, as shown in FIG. 11. The space in the center of the U-shape is filled with a winding, preferably insulated copper wires or copper plates.

The current in the winding created by the drive will create a magnetic field in the yoke that will pass through the air gap to the shuttle (rotor), being directed essentially perpendicular to the direction of motion of the above shuttle 10 ', which is shown by the magnetic flux line in Fig.11.

In the yoke assembly 8 ', various winding connections can be made. Three windings, one for each phase, can be combined into a star-connected three-phase motor winding. Alternatively, six yoke assemblies or a different multiple multiple of three may be combined. For a shuttle (rotor) with permanent magnets, assemblies of 8 'yokes can be assembled tightly next to each other. Also, the layers 42, 41 can be magnetically divided between two yokes.

In the case of permanent magnets, the air gap between the yokes and the shuttle can be increased to about millimeters, thereby allowing mechanical deviations in the motor assembly. The above example describes a three-phase design, other designs of power switches and yokes, the number of phases in which differs from three, are considered obvious to specialists in this field of technology

The dimensions and materials shown in FIGS. 11 and 12 are to be considered for illustrative purposes only. The invention is not limited to any specific dimensions or any embodiment of the above, but rather, it can be changed within the framework of the attached claims. For example, the invention can be used with a battery that can be recharged, or can be powered by a conventional power source with a cord plugged into an electrical outlet, for example, having a voltage of 110 to 220 volts.

Claims (16)

1. An electric drive tool for securing the elements, comprising a movable shuttle (10) attached to the hammer (13), a drive motor having at least two assemblies (8, 9) of electromagnetic yokes in communication with the shuttle (10), which is located with the ability to move relative to the assemblies (8, 9) of the yoke, each assembly (8, 9) has electric coils (15) designed to create a magnetic field through the shuttle (10), and a control unit that controls the current in the coils (15 ) to create a magnetic field with the creation of a force for shuttle shutdown (10), characterized in that the assemblies (8, 9) of electromagnetic yokes are designed to create a magnetic field that is directed mainly perpendicular to the direction of movement of the shuttle (10). 2. The tool according to claim 1, characterized in that the shuttle (10) contains many spaced iron cores (12). 3. The tool according to claim 1 or 2, characterized in that the shuttle (10) is placed to move between the pole surfaces (19) of both assemblies (8, 9) of electromagnetic yokes. 4. The tool according to claim 1, characterized in that the shuttle (10) is arranged to guide the support system to maintain a given air gap between the iron cores (12) and the pole surfaces (19) of the electromagnetic yoke assemblies. 5. The tool according to claim 1, characterized in that the shuttle is equipped with an impact rod (13) attached to one end of the shuttle for hitting the head or top of the fastener to push it into the base. 6. The tool according to claim 1, characterized in that the shuttle (10) is equipped with a spring (14), which is at least partially located inside the shuttle (10) and is designed to receive kinetic energy during the reverse movement of the shuttle (10). 7. The tool according to claim 6, characterized in that the shuttle is arranged to move backward and compress the spring (14) and move forward with the help of the force of the spring and the magnetic forces of the motor. 8. The tool according to claim 1, characterized in that the shuttle is placed with the ability to move back and forth several times, ensuring that with each movement of the shuttle the clogging of the fastener. 9. The tool according to claim 1, characterized in that it contains a sensitive device for determining the position of the shuttle (10) and transmitting information related to the above position to the control unit. 10. The tool according to claim 9, characterized in that the control unit is made in the form of a microcomputer for processing information from sensors to supply current to the coils (15) in the yoke assemblies (16) and create a magnetic field that generates a force to move the shuttle forward. 11. The tool according to claim 1, characterized in that the control unit is designed to determine the response time of each individual assembly (8) and (9) of electromagnetic yokes and track the number of strokes and the correct location of the fastener before impact. 12. The tool according to claim 1, characterized in that it contains a battery (1) for powering the coil (15) on the yoke assemblies (16). 13. The tool according to p. 12, characterized in that the battery is made rechargeable in a separate charging unit with the ability to replace a new charged battery. 14. The tool according to claim 1, characterized in that it contains a sensor for measuring the amount of remaining battery energy (1) to inform the operator about the need to replace the battery with a new or recharged one. 15. The tool according to claim 1, characterized in that it contains a supply cassette (5) for fasteners, such as nails, buttons or staples, to move the nail, button or staple to a position on the working rail (6) in front of the hammer (13) attached to the shuttle (10) to move the nail, button or staple into the base. 16. The tool according to claim 1, characterized in that the shuttle (10) contains many permanent magnets located along the longitudinal direction of the shuttle.

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