KR101106837B1 - Linear stepping motor - Google Patents

Abstract

The present invention discloses a linear stepping motor.
In the linear stepping motor of the present invention, a stator made of an excitation coil is formed on an inner circumferential surface of the case, and a plurality of magnetic poles are alternately magnetized along the circumferential surface by forming an electromagnetic force by interacting with a gap formed on the inner circumferential surface of the stator. In a linear stepping motor having a rotor consisting of a tubular magnet, a shaft having a vertical displacement screwed to the inner peripheral surface of the rotor and an interlocking shaft connected to the shaft and the coupler, the shaft has a blow pin at one end; Protrudingly formed, the coupler is integrally formed with a stop pin for selectively colliding with the hitting pin in the inner space in which one end of the shaft is inserted, one end of the linkage shaft is connected to one side, the coupler to the main body It is a fixing element, which is fitted to prevent mutual rotation. It is configured to include a bracket which is possibly provided with a displacement.

Description

Linear Stepping Motors {LINEAR STEPPING MOTOR}

The present invention relates to an axial linear moving motor in which the shaft moves forward and backward in linear motion in conjunction with the rotation of the rotor. More specifically, the drive cannot be driven by a stop resistance applied from the outside while the shaft is moved forward or backward. The present invention relates to a linear stepping motor that can prevent the phenomenon in advance and ensure the reliability and stability of the operation.

In general, a motor is a device in which a rotational force is generated by a current flowing between a coil of a rotor and a magnetic field of a stator. A stepping motor rotates a predetermined angle without feedback to detect a shaft position. It can stop with a very high accuracy, and because it has a very large stop torque when stopping compared to other motors, it does not require an element for maintaining a position such as an electromagnetic brake, and the rotational speed is also proportional to the pulse rate. Therefore, it has a driving characteristic that can be easily controlled.

Due to these characteristics, the stepping motor is mainly used for precisely controlling the amount of mechanical movement, and in particular, it is possible to control digitally by pulse, so it is widely used as a driving source for small precision electronic devices. It is used.

For example, the stepping motor may include printing position control of a print head, pen position control of an XY Plotter, or head position control of a floppy disk and various disks, a bill counter, a sewing machine, an electric typewriter, a facsimile machine, and the like. Like this, it is used as a precise control driving source for various electronic devices.

Conventional stepping motors are roughly classified into rotors and stators.

The rotor is composed of a shaft and a magnet, wherein the shaft is a rotating shaft having a predetermined length and is fitted to a plurality of bearings so as to be rotatable in the forward and reverse directions. In addition, a magnet is provided at an outer circumference of one end of the shaft, and the magnet has a substantially cylindrical shape, in which N · S poles are alternately magnetized, and has an excitation coil and a void provided on the inner circumferential surface of the stator. By being disposed oppositely, a predetermined electromagnetic force is generated by interaction.

The stator includes a bobbin in which several coils are respectively wound.

In the conventional stepping motor having such a configuration, when a current is applied to the coil of the stator, an electromagnetic force is generated between the coil of the stator and the magnetic pole of the rotor, and the rotor composed of the magnet and the shaft by the electromagnetic force at this time It will rotate around the stator.

On the other hand, the stepping motor is configured to linearly move the object by connecting the lead screw to the shaft which is the output rotation axis.

However, in recent years, in accordance with the trend toward miniaturization and thinning of precision instruments, stepping motors mounted on these precision instruments are also required to be reduced in volume. In addition, the shaft is rotated, and a spiral screwed lead screw is connected to the outer surface. In addition to the complex configuration of screwing the object to the lead screw to move linearly, a motor capable of direct axial transfer of the shaft as a rotating element has been developed and applied.

The linear valve gate device for injection molding machine of the Republic of Korea Patent No. 10-0529839 is coupled to a rotor made of an excitation coil, a tubular magnet provided with a gap on the inner circumferential surface of the excitation coil, and an inner circumferential surface of the magnet. Rotator is made of a rotating shaft that is spirally processed on the inner circumferential surface by screwing integrally, and screwed to the inner circumferential surface of the shaft. Both ends protrude to the outside of the case and one end is supported by a square structure on the case side to prevent rotation. The vertical movement shaft which vertically moves along a spiral at the time of rotation of a rotating shaft by this is disclosed.

In addition, Korean Patent No. 10-0676728 discloses an 'electric injection molding machine valve device'. The driving means in the valve device is a stator made of an excitation coil and a tubular magnet in which a plurality of magnetic poles are alternately magnetized along a circumferential surface of the stator and arranged in a space between the inner circumferential surface of the stator to form electromagnetic force by interaction. Rotor and a hollow rotary shaft fitted to the inner circumferential surface of the rotor to rotate integrally, and one end of the length member projecting to the outside of the forward / reverse motor while one end is screwed into the inner circumferential surface of the rotary shaft. Is disclosed.

Recently, cavity linear stepping motors have been developed in which the shaft is directly forward or backward.

However, the linear stepping motor including the forward and reverse motors in various valve devices of the present applicant has a problem that the operation is not smooth when the stop resistance occurs in the forward or backward state of the shaft.

For example, in the case of a motor that is applied to the 'linear injection valve device for injection molding machine' of the Republic of Korea Patent No. 10-0529839 and the Republic of Korea Patent No. 10-0676728 of the present applicant, When the linkage shaft moves from the open or closed state to the relative position, smooth driving does not occur.

This means that in most hot runner systems, the interlocking shaft is fitted to the outlet when the outlet (gate) is blocked and the other end is fitted to the bushing to support linear movement. In the case of raising the interlocking shaft, a power that is large enough to overcome the static resistance applied to the interlocking shaft (frictional resistance due to a supporting element such as a bushing for supporting the interlocking shaft and a frictional resistance when it is inserted into the outlet) is used. in need.

That is, in most hot runner systems, a drive source with an output higher than the rated output is applied to overcome the frictional resistance initially actuated when moving to the relative position in the raised or lowered state of the interlocking shaft and to allow the lowering or raising operation to be executed. It is true.

Therefore, there is a problem that not only the closed end of the manufacturing cost is increased as the drive source of high output is required, but also the freedom of application to the mold for forming a compact and precise injection molding as the volume increases.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to overcome the stop resistance acting when moving to the relative position in the forward or backward movement state, so that accurate operation can be achieved by improving the reliability of the operation. To provide a linear stepping motor that can be increased.

A linear stepping motor according to an embodiment of the present invention for realizing the above object is arranged with a stator made of an excitation coil on the inner inner circumferential surface of the case and having an air gap on the inner circumferential surface of the stator to form electromagnetic force by interaction. A linear rotor having a rotor having a tubular magnet in which a plurality of magnetic poles are alternately magnetized along a circumferential surface thereof, a shaft having a vertical displacement screwed to the inner circumferential surface of the rotor, and a linking shaft connected to the shaft and a coupler; In the stepping motor, the shaft is characterized in that the striking pin protrudes at one end, the coupler is characterized in that the stop pin is formed so as to suppress the rotation of the striking pin when the shaft rotates so that the shaft has a vertical displacement.

As a preferable feature of the present invention, the shaft is provided with upper and lower rolling members in the form of a ball for rolling contact respectively on the upper and lower surfaces.

In another preferred aspect of the present invention, the coupler is that each slide fitting groove is formed so that each end of the shaft and the interlocking shaft in the direction orthogonal to the lifting direction can be fitted in the side.

As another preferable feature of the present invention, the coupler is formed so that the through hole into which one end of the shaft is inserted in the center is vertically penetrated, and the lower side thereof can be slidably fitted laterally in a direction perpendicular to the lifting direction. A main coupler having a slide fastening groove provided with a step in an opposite direction; A gap maintaining bearing in which the outer circumferential surface of the outer ring is fitted into the slide fastening groove, and one end of the shaft is fitted into the inner circumferential surface of the inner ring; The groove is inserted into the slide fastening groove and is constrained in the up and down direction, and a space groove for forming a gap with a lower surface of the shaft coupled to and supported by the gap bearing is formed at an upper center thereof. One end is configured to include a sub-coupler is formed with a pinned slide groove is fitted.

According to another embodiment of the present invention, a linear stepping motor includes a stator formed of an excitation coil on an inner circumferential surface of a case, and a plurality of circumferential surfaces along the circumferential surface of the linear stepper, having an air gap formed therebetween to form an electromagnetic force by interaction. A linear stepping motor having a rotor made of a tubular magnet in which magnetic poles are alternately magnetized, a shaft having a vertical displacement screwed to an inner circumferential surface of the rotor, and an interlocking shaft connected to the shaft and a coupler, wherein the shaft Is hitting the protruding pin is formed at one end, the coupler is formed integrally protruding stop pins to selectively collide with the hitting pin in the inner space where one end of the shaft is inserted, one end of the interlocking shaft is connected In order to prevent mutual rotation, the coupler is coupled to the motor to fix the coupler. While it is configured to include a bracket that is provided to enable displacement in the vertical direction.

As a preferred feature of the present invention, the shaft is formed in a position opposite to the screw portion and the screw portion is fastened to the rotor and one side is open and the skirt portion protruding blow pin at a position eccentrically from the axis to one side of the inner peripheral surface and And a bearing provided in an outer circumferential surface of the skirt portion and an inner space of the coupler.

In another preferred aspect of the present invention, the coupler is formed in the inner space into which the skirt portion is inserted, protruding stop pins colliding with the hitting pin during rotation of the shaft, the one end so that the extended end of the interlocking shaft can be fitted Pin fastening slide groove is formed.

In the linear stepping motor according to the present invention, when the rotor of the motor rotates in the no-load state to move to a relative position in a state in which the shaft is moved forward or backward, the screw fastened to the shaft rotates about one rotation and then One end (hit pin) strikes the stop pin to generate a collision force, and at the same time suppresses the rotation of the shaft, consequently overcomes the stopping resistance received from the shaft, and at the same time has a vertical displacement to ensure a stable forward and backward movement of the shaft. There is a useful effect to ensure that.

In addition, since the structure can be simplified, the present invention can be applied to a miniaturized valve device for manufacturing small and precision parts.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best describe their own invention. Based on the principle that the present invention should be interpreted in a sense consistent with the technical spirit of the present invention.

1 and 2 are cross-sectional views for explaining the forward and backward operations of the linkage shaft in the linear stepping motor according to the first embodiment of the present invention;
3 and 4 are cutaway perspective views for explaining the configuration of Figures 1 and 2,
5 and 6 are a perspective view for explaining the coupling relationship between the shaft and the coupler according to the present invention,
7 is a cutaway perspective view showing a linear stepping motor according to a second embodiment of the present invention;
FIG. 8 is an exploded perspective view showing the main configuration of the linear stepping motor of FIG. 7. FIG.
9 and 10 are cutaway perspective views for explaining the forward and backward operation of the shaft in the linear stepping motor according to the third embodiment of the present invention,
11 and 12 are exploded perspective views for explaining the configuration of the linear stepping motor according to FIG.
13 and 14 are perspective views for explaining a coupling configuration of the shaft and the coupler in the linear stepping motor according to FIG.
FIG. 15 is a plan view illustrating a striking process during motor operation in the linear stepping motor of FIG. 9; FIG.

Hereinafter, a linear stepping motor according to the present invention will be described with reference to the accompanying drawings. First, it should be noted that the same components or parts among the drawings are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 and 2 are cross-sectional views for explaining the forward and backward operation of the interlocking shaft in the linear stepping motor according to the first embodiment of the present invention, Figures 3 and 4 are cut to explain the configuration of Figures 1 and 2 5 and 6 are perspective views for explaining the coupling relationship between the shaft and the coupler according to the present invention.

As shown therein, the linear stepping motor 1 of the present invention includes a main body 30 that is composed of a stator 32, a case 31 including a rotor 33, and a shaft 35.

 The main body 30 generates a driving force for forwarding and reversing the interlocking shaft 15 exposed to the outside of the case 31. The main body 30 receives power from the outside, and the stator 32 and the rotor 33 interoperate with each other. As the rotor 33 rotates through the operation, the shaft 35 in a screw-fastened state interlocks with each other to move up and down.

That is, the main body 30 is formed on the inner circumferential surface of the case 31 and the inner inner circumferential surface of the case 31 to form an outer body, the stator 32 made of a female coil, and the stator 32 The rotor 33 is formed of a tubular magnet in which a plurality of magnetic poles are alternately magnetized along the circumferential surface to form an electromagnetic force by interaction with the voids arranged in the inner circumferential surface of the inner circumferential surface, and the inner circumferential surface of the rotor 33. It consists of a shaft 35 which is screwed in and a coupler 37 which is an element for connecting the shaft 35 with the linkage shaft 15. Since the stator 32 and the rotor 33 are implemented by a well-known technique among the elements which comprise such the main body 30, detailed description is abbreviate | omitted.

As shown in the drawing, the shaft 35 has a threaded portion (unsigned) having a threaded line formed on its outer circumferential surface, and is screwed with a spiral portion (unsigned) formed on the inner circumferential surface of the rotor 33, and a lower end thereof is a coupler. It is a structure connected to the upper end of the linkage shaft 15 through 37. The shaft 35 may be integrally rotated in conjunction with the rotation of the rotor 33, but the rotation is suppressed after approximately one rotation by the structure of the hitting pin 35a and the stop pin 37a to be described later, the vertical Displacement is achieved.

That is, the shaft 35 starts to rotate in conjunction with the rotation of the rotor 33, the stop pin (37a) of the coupler (37) to be described later is a blow pin (35a) protruding on one side before turning one wheel ), Rotation is suppressed. Accordingly, as the rotor 33 rotates while the shaft 35 is suppressed from rotation, the shaft 35 is displaced in a vertical direction, that is, a lifting operation is performed.

On the other hand, in the present invention, the shaft 35 is provided with upper and lower rolling members 35b1 and 35b2 in the form of balls (ball) for rolling contact on the upper and lower surfaces, respectively. To this end, in the present invention, the upper ball groove 35h1 is formed on the upper surface of the shaft 35, and the upper cloud member 35b1 is provided within the upper ball groove 35h1. At this time, the upper cloud member (35b1) is part of the upper fitting groove (37s') is provided so as to make a cloud contact to one side of the inner wall surface of the case (31). In addition, the shaft 35 has a lower fitting groove 37s ″ formed on a lower surface thereof, and a lower rolling member 35b2 serving as a sphere is accommodated in the lower fitting groove 37s ″. At this time, the lower rolling member 35b2 is in contact with the upper fitting groove 37s ′ of the coupler 37 by being partially exposed from the lower fitting groove 37s ″.

The shaft 35 of such a configuration can minimize the frictional resistance with the counterpart parts because the upper and lower rolling members 35b1 and 35b2 provided in the upper and lower surfaces are in rolling contact with each other.

As shown in the drawing, the coupler 37 is provided as a cylindrical member, and one end of each of the shaft 35 and the interlocking shaft 15 may be assembled by slide fitting in a direction orthogonal to the lifting direction. Slide fitting grooves 37s' and 37s ″ are formed so as to be possible. The coupler 37 has a feature that includes a stop pin 37a as an element for receiving collision energy while suppressing rotation of the shaft 35. That is, the stop pin 37a of the coupler 37 collides with the striking pin 35a of the shaft 35 to generate collision energy and transfer it to the linkage shaft 15. As a result, the linkage shaft 15 This eliminates the stop resistance that acts on. In the present invention, it is proposed that one stop pin 37a is formed on one side of the upper surface of the coupler 37, but two may be formed at intervals.

On the other hand, the coupler 37 in the present invention is preferably provided with a material having a low thermal conductivity so that the heat transmitted to the interlocking shaft 15 can be prevented from being transferred to the shaft 35. In addition, since the coupler 37 serves to connect the shaft and the shaft may be variously implemented by a known technique.

In the main body 30 configured as described above, when a current is applied to the stator 32 made of the excitation coil from the outside, an electromagnetic force is generated between the rotor 33, which is a magnet provided on the inner circumferential surface with a gap, and at this time As the rotor 33 rotates in the forward and reverse directions about the stator 32 by the electromagnetic force, the shaft 35 screwed to the inner circumferential surface of the rotor 33 starts to rotate integrally. .

At this time, the shaft 35 is rotated by being stopped by the stop pin (37a) at the time of making about one revolution in conjunction with the rotation of the rotor 33, so that the shaft 35 ) Is prevented from rotating and the rotor 33 rotates, and as a result, the shaft 35 moves up and down in a vertical direction, that is, in an up and down direction.

Referring to the operation of the linear stepping motor according to the present embodiment configured as described above are as follows.

Referring to the drawings, when power is applied to the main body 30 in the state in which the interlocking shaft 15 is moved forward, the rotor 33 starts to rotate in one direction, and screws on an inner circumferential surface of the rotor 33. The shaft 35 connected by fastening also starts to rotate in conjunction with the rotor 33.

Subsequently, before the shaft 35 starts to rotate and reaches one rotation, the striking pin 35a provided on one side of the shaft 35 contacts the stop pin 37a of the coupler 37 so that the rotational motion is suppressed. Since the shaft 35 is not rotated together with the rotor 33, the shaft 35 has a vertical displacement in a direction in which the shaft retreats, that is, in a backward direction, based on the drawing by the screw fastening structure.

On the other hand, collision force is generated when the striking pin 35a of the shaft 35 collides with the stop pin 37a during the reverse operation of the interlocking shaft 15. Such collision energy causes the stop pin 37a to stop. The linkage shaft 15 is transmitted through the linkage shaft 15, and as a result, the linkage shaft 15 receives the collision energy due to the collision of the hitting pin 35a and the stop pin 37a to overcome the stop resistance and move backward.

On the contrary, when power is applied to the main body 30 in the state in which the interlocking shaft 15 is moved backward and the rotor 33 starts reverse rotation, the inner peripheral surface of the rotor 33 is connected by screwing. The shaft 35 also starts in reverse rotation in conjunction with the rotor 33.

Subsequently, before the shaft 35 starts to rotate and reaches one rotation, the striking pin 35a provided on one side of the shaft 35 contacts the stop pin 37a of the coupler 37 so that the rotational motion is suppressed. The shaft 35 is not rotated together with the rotor 33 and has a vertical displacement in a forward direction.

Meanwhile, collision energy is generated when the striking pin 35a of the shaft 35 collides with the stop pin 37a during the forward operation of the interlocking shaft 15. Such collision energy causes the stop pin 37a to stop. The linkage shaft 15 is transmitted through the linkage shaft 15, and as a result, the linkage shaft 15 receives the collision energy due to the collision of the hitting pin 35a and the stop pin 37a to overcome the stop resistance and move forward.

As described above, in the present invention, in the state in which the interlocking shaft 15 is moved backward or forward, the resin is filled in the resin furnace 12 and receives a stop resistance due to contact with each component. ) At the time when the rotor 33 is interlocked to make approximately one revolution, the striking pin 35a collides with the stop pin 37a to generate collision energy, and transmits the collision energy to the interlocking shaft 15. To eliminate the stop resistance. In addition, the shaft 35 has a rolling member (35b1, 35b2) to minimize the frictional resistance with the target member in contact with the upper and lower surfaces.

7 is a cutaway perspective view illustrating a linear stepping motor according to a second embodiment of the present invention, and FIG. 8 is an exploded perspective view illustrating a main part of the linear stepping motor of FIG. 7.

As shown in this figure, the main step of the linear stepping motor described above is the same in the linear stepping motor in this embodiment. Therefore, in the following description of the configuration of the linear stepping motor according to the present embodiment, the same components as those in the above-described embodiment will be omitted.

Referring to the drawings, the linear stepping motor 1 according to the present embodiment performs a rotational motion in the forward and reverse directions so that the lower surface of the shaft 35 having the threaded portion 35s screwed to the motor is connected to the other parts. The technical feature of the present invention is to provide a coupler 38 which prevents frictional damage while preventing rotational friction. That is, the coupler 38 in this embodiment is largely comprised of the main coupler 38a, the clearance bearing 38b, and the sub coupler 38c.

The main coupler 38a is provided on the inner circumferential surface of the cooling block 50 so as not to rotate so as not to flow in the rotational direction. Here, the cooling block 50 is to cool the heat generated in the main body 30 is provided in a tubular shape of the hollow center and the cooling water line 51 is circulated to flow the cooling water supplied from the outside therein Is formed. Meanwhile, the cooling block 50 according to the present invention forms a groove (not shown) having a shape corresponding to the flow preventing groove 38ah ′ having a semicircular groove shape on the outer surface of the main coupler 38a. In addition, a flow preventing pin 38f is inserted into the cylindrical groove to prevent the cooling block 50 and the coupler 37 from flowing in mutual rotation directions.

In addition, the main coupler 38a is formed with a through hole 38ah in a vertical direction. At this time, the through hole 38ah is a hole through which one end of the shaft 35 is inserted. Since the lower end of the (35) is provided to have an extended diameter, the assembly is inserted into the upper side from the lower side of the main coupler (38a) when assembled, and the structure is prevented from being separated in the upper direction by having the lower end has an expanded diameter to be.

In addition, the main coupler 38a is a slide fastening groove 38as to allow the gap retaining bearing 38b and the sub coupler 38c, which will be described later, to be laterally orthogonal to the lower side in a direction orthogonal to the lifting direction. Is formed. At this time, both sides of the slide fastening groove (38as) is formed with a step (38as') in a direction facing each other.

The clearance bearing 38b is a ball bearing having an inner ring and an outer ring. The gap retaining bearing 38b is fixed by being fitted with the outer circumferential surface of the outer ring in the slide fastening groove 38as, one end of the shaft 35 is fitted with the inner circumferential surface of the inner ring.

On the other hand, the gap holding bearing 38b is prevented from being separated by a snap ring (sr), for this purpose, the shaft 35 is prevented from being separated in the assembling direction in the assembled state of the gap holding bearing 38b. A snap ring groove (unsigned) into which the snap ring sr is fitted is formed.

The sub coupler 38c is slide-fitted into the slide coupling groove 38as of the main coupler 38a to be constrained to prevent flow in the up and down directions, and is coupled to and supported by the gap maintaining bearing 38b at the upper center thereof. A gap groove 38cs for forming a gap with a lower surface of the shaft 35 is formed, and both sides of the gap groove 38cs are fitted with a step 38as' of the slide fastening groove 38as. Rail portion 38ca is assembled to form. In addition, the sub-coupler 38c has a pinned slide groove 38cd in which the head portion 15h of the interlocking shaft 15 slides in a lateral direction that is perpendicular to the lifting direction.

The sub coupler 38c having such a configuration is coupled to the main coupler 38a together with the gap retaining bearing 38b in a state where the upper part thereof is assembled by slide fitting into the slide fastening groove 38as of the main coupler 38a. As the lower surface of the fixed shaft 35 is not contacted, surface damage due to frictional contact is prevented without causing a rotational load due to friction during rotation of the shaft 35.

The assembly of the coupler 37 according to the second embodiment of the present invention configured as described above is as follows.

The main coupler 38a constituting the coupler 37 in this embodiment is assembled in a structure in which rotation is prevented inside the cooling block 50. One end of the shaft 35 is inserted into the through hole 38ah vertically penetrating the center thereof. At this time, the shaft 35 has a gap retaining bearing 38b formed of an inner and outer ring at a lower end thereof. The fittings are combined.

The rail fastening groove 38as provided at the lower portion of the main coupler 38a is slide-fitted to the rail portion 38ca of the sub coupler 38c, and a pin fastening slide groove is formed on the upper surface of the sub coupler 38c. The lower surface of the shaft 35 is formed by the formation of 38cd, so as to have a gap g between one surface of the pin fastening slide groove 38cd of the sub-coupler 38c. That is, the shaft 35 is supported by the gap retaining bearing 38b to be rotated and supported by the slide fastening groove 38as of the main coupler 38a, and the lower surface thereof has a gap g with the sub coupler 38c. Are placed.

The linear stepping motor 1 having the coupler 37 composed of the main coupler 38a, the gap bearing 38b, and the sub-coupler 38c having the above configuration is the same as the linear stepping motor in the above-described embodiment. Since the lifting and lowering of the interlocking shaft is performed by the operation, detailed description thereof will be omitted.

9 and 10 are cutaway perspective views for explaining the forward and backward operations of the shaft in the linear stepping motor according to the third embodiment of the present invention, Figures 11 and 12 illustrate the configuration of the linear stepping motor according to FIG. It is an exploded perspective view for that.

13 and 14 are perspective views illustrating a coupling configuration of a shaft and a coupler in the linear stepping motor according to FIG. 9, and FIG. 15 is a plan view illustrating a blow process during operation of the motor in the linear stepping motor of FIG. 9. to be.

As shown in this figure, the linear stepping motor in this embodiment is similar to the configuration of the first embodiment described above. Therefore, in the following description of the configuration of the linear stepping motor according to the present embodiment, the same components as those in the above-described embodiment will be omitted.

Referring to the drawings, the linear stepping motor 1 according to the present embodiment is a shaft 35 having a screw portion 35s screwed to the motor by performing a rotation operation in the forward and reverse directions, and the shaft 35. It is characterized by a simplified structure by improving the coupling structure of the coupler 39, a portion of which is inserted.

The shaft 35 has a threaded portion (35s) formed with a screw thread on the upper outer peripheral surface as shown in the figure spiral portion (unsigned) formed on the inner peripheral surface of the rotor 33 which is an element constituting the main body 30 And screw is fastened, the lower end is a structure that is connected to the upper end of the interlocking shaft 15 through the coupler (39). The shaft 35 may be integrally rotated in conjunction with the rotation of the rotor 33, but rotates at a position less than about one rotation by the structure of the hitting pin 35a and the stop pin 39a which will be described later. This is suppressed to achieve vertical displacement.

That is, the shaft 35 starts to rotate in conjunction with the rotation of the rotor 33, the stop pin (39a) of the coupler (39) which will be described later is a blow pin (35a) protruding on one side before turning one wheel The rotation is limited in contact with), and as a result of which the rotor 33 is subjected to the rotational action while the shaft 35 is suppressed from rotation, consequently, the shaft 35 is displaced in the vertical direction. , Lifting and lowering operation is made.

This configuration is similar to that of the embodiment described above. However, in the present embodiment, the shaft 35 has a lower end portion extending in a cylindrical shape, and a skirt portion 35u having an open lower surface is formed, and a bearing br is fitted to the outer circumferential surface of the skirt portion 35u. At this time, the bearing br is an element that enables the relative rolling motion of the outer surface of the skirt portion 35u and the inner surface of the coupler 39 to be described later.

That is, as shown in the drawings, the shaft 35 in this embodiment is screwed to the rotor 33 of the main body 30 to form a screw thread on the upper outer circumferential surface of the upper circumferential surface to receive the rotational driving force. 35 s is provided, and a skirt portion 35 u having a lower surface opened is formed below the screw portion 35 s. At this time, the skirt portion 35u is provided with a bearing br on the outer circumferential surface, and in the present invention, a structure in which the first and second bearings b1 and b2 are fitted at the upper and lower sides of the skirt portion 35u is proposed. It was.

In more detail, the skirt portion 35u has upper and lower bearing fitting portions 35ub1 and 35ub2 so that the first and second bearings b1 and b2 may be fitted at upper and lower sides thereof. The protrusion 35up is provided between these upper and lower bearing fitting parts 35ub1 and 35ub2. In addition, the upper bearing fitting portion 35ub1 is fitted with a second snap ring s2 at a position in contact with an upper surface of the first bearing b1 so that the upper bearing fitting portion 35ub1 is not separated upward when the first bearing b1 is fitted. The second snap ring groove 35sh is formed, and the lower surface of the first bearing b1 is limited in contact with the protrusion 35up by moving downward. And the second bearing (b2) is limited to the upper flow by the upper surface is in contact with the protrusion 35up, the lower surface is in contact with the bottom surface of the coupler 39 to be described later the flow is limited.

On the other hand, in the shaft 35, the skirt portion (35u) is formed integrally protruding hitting pin (35a) on the inner peripheral surface, the hitting pin (35a) at this time is the stop pin (39a) of the coupler 39 to be described later To generate a collision force.

The coupler 39 is provided as a cylindrical member having an open top surface, and a stop pin 39a protrudes from the bottom surface so as to collide with the striking pin 35a formed on the skirt portion 35u of the shaft 35. .

In addition, the coupler 39 is formed with a first snap ring groove 39sh into which the first snap ring s1 is fitted into the upper inner circumferential surface, wherein the first snap ring s1 is an inner space 39uh of the coupler 39. In order to prevent the separation in the state in which the skirt portion 35u of the shaft 35 is fitted in contact with the upper edge portion of the first bearing b1 fitted to the upper outer peripheral surface of the skirt portion 35u to prevent the separation. .

On the other hand, the bottom surface of the coupler 39 is provided so that the bottom portion of the second bearing (b2) is in contact with the second bearing (b2) contact, that is, the bottom edge portion protrudes, the stop pin ( 39a) is formed to protrude at a position that does not interfere with the second bearing b2.

In addition, the coupler 39 has a pinned slide groove 39cd in which the head portion (unsigned) of the interlocking shaft 15 slides in a horizontal direction that is perpendicular to a vertical direction in a lifting direction. do.

On the other hand, the coupler 39 in the present embodiment is preferably formed of a material having a low thermal conductivity so that the heat transmitted to the interlocking shaft 15 can be prevented from being transferred to the shaft 35 and the main body 30 side. .

The coupler 39 of this configuration eliminates the stop resistance acting on the interlocking shaft 15 by generating collision energy before the shaft 35 is about one rotation when the main body 30 is driven.

The coupler 39 generates a collision energy by hitting the stop pin (39a) formed on the bottom surface side with the hitting pin (35a) of the shaft 35, and transfers it to the linkage shaft 15 as a result the linkage shaft The stop resistance acting on (15) is eliminated.

On the other hand, the coupler 39 is fixed to the main body 30 by a bracket (ca) having a through hole formed in the center, the bracket (ca) at this time as shown in the drawing, the shaft 35 and the coupler ( While enabling the lifting operation of 39) serves to prevent the separation from the main body (30).

That is, the coupler 39 has a flange portion 39f having an upper portion extended outward based on the drawing, and a semi-circular flange pin groove 39h is formed at the edge side of the flange portion 39f. The pin groove 39h corresponds to the bracket pin groove c1h formed on the inner circumferential surface of the annular first bracket c1 constituting the bracket ca, thereby preventing rotation of the pin groove 39h.

In detail, the bracket ca has a ring-shaped first bracket c1 coupled to and fixed to one side of the main body 30 and the first bracket c1 in a state where the coupler 39 is fitted. It consists of a ring-shaped second bracket (c2) coupled integrally with. Here, the first bracket c1 has a semicircular bracket pin groove c1h corresponding to the semicircular flange pin groove 39h formed in the flange portion 39f of the coupler 39 on the inner circumferential surface thereof, and these flange pin grooves ( The coupler 39 is prevented from flowing in the rotational direction by the fitting pin p being fitted into the circular groove formed by 39h) and the bracket pin groove c1h.

On the other hand, the coupler 39 is a flange portion (39f) having an expanded diameter with respect to the body is assembled to the flange mounting step portion (c2p) of the second bracket (c2) the coupler 39 is a flange portion ( The upper surface of 39f) coincides with the upper surface of the second bracket c2. In addition, although not illustrated, the first bracket c1 and the second bracket c2 are fixed to the main body 30 through screw members.

By such a configuration, the coupler 39 is coupled to the first bracket c1 and the fixing pin p, and thus, the rotation of the coupler 39 is different from that of the skirt portion 35u of the shaft 35 inserted into the inner space 39uh. It has a structure that does not rotate interlocking integrally.

Accordingly, when the rotor 33 of the main body 30 rotates, the shaft 35 screwed thereto is integrally interlocked to achieve rotation. At this time, while the skirt portion 35u of the shaft 35 rotates inside the coupler 39, the hitting pin 35a collides with the stop pin 39a of the coupler 39 while the rotation is prevented. As the lifting force 39 is raised, the collision force is transmitted to the linkage shaft 15 through the coupler 39, and the stop resistance acting on the linkage shaft 15 is removed.

The present invention having the above configuration is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

1: linear stepping motor 15: interlocking shaft
30: body 31: case
32: stator 33: rotor
34: bearing 35: shaft
35a: Blow pin 37: coupler
37a: stop pin

Claims (7)

The rotor consists of a stator made of a female coil on the inner circumferential surface of the case and a magnet formed in a tubular magnet in which a plurality of magnetic poles are alternately magnetized along the circumferential surface to form an electromagnetic force by interacting with a space between the inner circumferential surface of the stator. In a linear stepping motor having an electron, a shaft having a vertical displacement screwed to the inner circumferential surface of the rotor and an interlocking shaft connected to the shaft and the coupler,
The shaft 35 has a striking pin 35a protruded at one end thereof, and the coupler 37 suppresses the rotation of the striking pin 35a when the shaft 35 rotates so that the shaft 35 has a vertical displacement. Linear stepping motor, characterized in that the stop pin (37a) is formed to protrude.
2. The linear stepping motor according to claim 1, wherein the shaft (35) is provided with upper and lower rolling members (35b1, 35b2) in the form of balls for rolling contact on the upper and lower surfaces, respectively.
The slide fitting groove (37s) of claim 1, wherein the coupler (37) allows each end of the shaft (35) and the linkage shaft (15) to be slide-fitted at the side in a direction orthogonal to the lifting direction. ′, 37 s ″).
The method of claim 1, wherein the coupler,
A through hole 38ah into which one end of the shaft 35 is inserted in the center is vertically penetrated, and a lower step 38as in a direction facing each other so that the lower side can slide in a lateral direction orthogonal to the lifting direction. A main coupler 38a having a slide fastening groove 38as provided with ′);
A gap retaining bearing 38b in which an outer circumferential surface of an outer ring is fitted into the slide fastening groove 38as, and one end of the shaft 35 is fitted into an inner circumferential surface of the inner ring;
The clearance groove 38cs for forming a clearance with the lower surface of the shaft 35 coupled to and supported by the clearance bearing 38b at the upper center by being fitted into the slide coupling groove 38as and restrained in the up and down direction. Sub-coupler (38c) is formed and the pin coupling slide groove (38cd) is formed in which the one end of the interlocking shaft (15) slides downward in the lateral direction;
Linear stepping motor, characterized in that configured to include.
The rotor consists of a stator made of a female coil on the inner circumferential surface of the case and a magnet formed in a tubular magnet in which a plurality of magnetic poles are alternately magnetized along the circumferential surface to form an electromagnetic force by interacting with a space between the inner circumferential surface of the stator. In a linear stepping motor having an electron 33, a shaft 35 which is screwed to the inner circumferential surface of the rotor 33 and has a vertical displacement, and an interlocking shaft connected to the shaft 35 and the coupler 39,
The shaft 35 has a striking pin 35a protruding from one end thereof, and the coupler has a stop pin 39a selectively colliding with the striking pin 35a in an inner space into which one end of the shaft 35 is inserted. ) Is integrally formed to protrude, and one end of the linkage shaft 15 is connected to one side,
Linear stepping motor, characterized in that it comprises a bracket (ca) which is provided to allow the displacement in the vertical direction while being coupled to prevent the mutual rotation as an element for fixing the coupler (39) to the main body (30).
The method of claim 5, wherein the shaft 35,
A screw portion 35s fastened to the rotor 33 and a skirt portion 35u having one side open and an impact pin 35a protruding at an eccentric position from one axis to an inner circumferential surface thereof are formed at positions opposite to the screw portion 35s. And a bearing (br) provided in an outer circumferential surface of the skirt portion (35u) and an inner space of the coupler (39).
The method of claim 6, wherein the coupler 39,
A stop pin 39a which strikes the striking pin 35a at the time of rotation of the shaft 35 is formed in an inner space into which the skirt portion 35u is inserted, and an extended end of the interlocking shaft 15 slides. The linear stepping motor, characterized in that the pinned slide groove (39cd) is formed on one side to be fitted.

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