JP2726012B2 - solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an operating rod operated by a movable iron core, for example, when used as a yarn stopping mechanism used in a yarn feeding device of an automatic loom or as a pusher for a sorter of various parts. It relates to a solenoid suitable for doing work.

[0002]

2. Description of the Related Art A weft yarn feeding device of an automatic loom is for feeding a weft yarn by a fixed length, and this weft yarn feeding device uses a yarn stopping mechanism for controlling start and stop of the yarn feeding at a yarn feeding portion. ing. Such a yarn stopping mechanism operates by using a solenoid as a drive source, and controls the stop and start of feeding by projecting or retracting a stop pin into or from a movement path (yarn path) of the yarn by the solenoid. doing.

In such a yarn stopping mechanism, one surface of a main body to which a solenoid is mounted and which movably accommodates a stop pin is used as a yarn path, and when the stop pin does not protrude from the surface, the weft thread contacts the surface. When the stop pin protrudes from the surface, the movement of the weft thread is stopped. An example of such a conventional yarn stopping mechanism is disclosed in Japanese Utility Model Laid-Open No. 5-35874. The yarn stopping mechanism disclosed in this publication forms a through hole b having a large diameter portion and a small diameter portion in a main body a, as shown in FIG.
A solenoid c is disposed coaxially with the through hole at the upper end of the through hole b and fixed to the main body a by a known means such as a set screw, and the plunger d of the solenoid c is disposed in the guide tube e. The connector bush h fitted and fixed in the hole g of the plunger c is slidably guided by the core bush f made of a material, and the resin bush i is fitted and fixed in the small diameter portion of the through hole b of the main body a. A guide pin is slidably movable, and a stop pin j is fitted and fixed to the tip (lower end in the figure) of the connector tube h. And a cushion 1 for preventing a jumping operation of the plunger against a spring retainer k which is integrally held. The cushion 1 is formed by joining an annular cushion ring n made of an elastic material such as rubber to both surfaces of a stopper m.
Further, a cushion member o made of rubber or the like is arranged to prevent a jumping operation when the stop pin j is retracted.

On the other hand, there is a pusher disclosed in Japanese Utility Model Application No. 4-69266 for discharging an article from a transfer line by a push rod which operates in the same manner as a stop pin of a thread stop mechanism. As shown in FIG. 7, a device according to the present application is a movable member arranged so as to be able to move straight ahead in a hole t defined by a bobbin of a coil r and a spacer s arranged in series in a main body q. The iron core u is in sliding contact with the inner surfaces of the bobbin and the spacer, and the push rod v attached to the movable iron core is in sliding contact with a bearing w arranged in the bobbin. The impact is absorbed by applying the flanges x formed on the movable iron core to the cushioning members y arranged at both ends of the moving range.

[0005] By the way, the stop pin of the thread stop mechanism of the automatic loom must be prevented from rebounding or jumping both when the stop pin is retracted and when the stop pin protrudes in order to prevent a mistake in threading control. In the yarn stopping mechanism according to the former application, jumping when the stop pin is retracted is simply prevented by a single cushion member.Therefore, there is a problem that a sufficient jumping prevention effect cannot be obtained. The anti-jumping effect on the protruding side of the pin is not sufficient for having a complicated structure. This is because when the plunger is pushed back by the spring and hits the cushion i, the integrated assembly of the plunger, the spring receiver, the connector tube and the stop pin has a large kinetic energy, but the cushion has a stationary structure. This is because the kinetic energy of the assembly cannot be sufficiently absorbed. Further, in the case of the pusher according to the latter application, when the movable core operates at high speed, simply absorbing the shock with the shock absorbing member effectively prevents the rebound or jumping when the movable iron core hits the shock absorbing member and stops. If the pusher is used as a thread stopping mechanism, there is a problem that the thread cannot be stopped reliably.

On the other hand, when used as a pusher for an article sorter, it is necessary to prevent jumping when the operating rod is retracted. However, the conventional apparatus does not have a sufficient jumping prevention effect. There is.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the solenoid's damping mechanism so that bouncing or jumping at the end of the reciprocating movement of the operating rod is negligibly small, whereby the operation of the operating rod is reduced. Eliminating mistakes.

Another object of the present invention is to provide a solenoid capable of maintaining a predetermined rebound preventing characteristic even under severe temperature conditions such as a low temperature condition.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a hollow coil disposed in a housing, a fixed core inserted in the coil, and a coil that is magnetically connected to the fixed core. A magnetic frame made of a magnetic material surrounding the movable core, a movable core arranged in the housing so as to be able to move away from and to approach the fixed core, and an operating rod attached to the movable core and extending through a through hole of the fixed core. A return spring that resiliently presses the movable core away from the fixed core,
In a solenoid that performs work by reciprocating motion of the operating rod, a shock absorber that is adapted to be pushed by an end of the movable iron core is disposed in the housing, and the shock absorber is formed in the housing. The shock absorber is movably arranged in the receiving space, and the shock absorber is elastically pressed in a direction opposite to the return spring by a buffer spring having a spring load greater than that of the return spring, and the mass of the shock absorber and the movable core are It is configured to be smaller than the combined mass of the operating rod.

In the above invention, the housing has a main body and a cover attached to the main body, a spacer is disposed between the coil and the cover, and the housing space is provided between the cover and the spacer. When the length L of the housing space in the moving direction of the movable iron core and the thickness T of the shock absorbing member are 3 gfM <10 gf, 0.15 mm ≦ LT ≦ 0.75 mm. You may. In addition, the suction surface of the fixed core is retracted inward from the end surface of the coil, a resin bearing member is inserted into the coil, the movable core is slidably supported by the bearing member, and the operating rod is The housing may be slidably supported by a bearing member disposed at an end of the housing. Furthermore, the central metal of the stopper shock absorber may comprise a buffer plate disposed on both sides of the stopper, the outer diameter D ₁ and the buffer spring of the flange portion of the movable iron core which corresponds to the impact absorber And the center-to-center diameter D ₂ may be such that D ₂ ≧ 0.5D ₁ .

[0011]

In the above construction, when the coil is not energized, the movable iron core is pushed away from the fixed iron core by the return spring, and the end face comes into contact with the shock absorber and stops.
The shock absorber is pushed up by a spring 8b so as to contact the shoulder 33. At this time, the operating rod is in the retracted position. When the coil is energized, the movable iron core moves toward the fixed iron core, and the operating rod comes to the protruding position, and performs predetermined work by the operating rod. Next, when the energization of the coil is stopped, the movable iron core and the operating rod move away from the fixed iron core by the action of the return spring, and hit the shock absorber. Then, the shock absorber moves within the space against the buffer spring and absorbs the kinetic energy of the movable iron core and the operating rod. For this reason, there is almost no rebound or jumping when the movable iron core stops.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a solenoid 1 according to the present embodiment. Solenoid 1 of this embodiment
Is the body 11 and cover 1 made of aluminum
2, the electromagnet assembly 2 and the spacer 3 are arranged in a hole 13 of a main body 11 of the housing 10. The material of the housing may be a material other than aluminum, such as a resin, as long as it is a non-magnetic material. The spacer 3 is made of a resin material. The electromagnet assembly 2 is magnetically connected to a coil 21 formed by applying a winding 23 around a bobbin 22, a fixed core 24 made of a magnetic material inserted into a hole of the bobbin 21, and a fixed core 24. Frame 2 surrounding the coil 21
5 and 26 are provided. A flange portion 240 is formed at a lower end portion (in FIG. 1) of the fixed iron core, and an outer periphery of the flange portion is in close contact with a lower end of the magnetic frame 25 to magnetically connect the two. Also, the magnetic frame 26
Are in close contact with the magnetic frame 25 to magnetically connect them.

The suction surface (upper end surface in this embodiment) 242 of the fixed iron core 24 is recessed from the end surface of the coil 21 by a predetermined length H in the hole, and a cylindrical bearing made of a resin material is provided in the hole. The member 4a is arranged. A cylindrical movable iron core 5 made of a magnetic material is movably disposed in a stepped hole 31 having a circular cross section formed in the spacer 3.
A portion of the movable core on the fixed core side is slidably supported in the bearing member 4a. An operating rod 6 extending through a through hole 241 of the fixed iron core 24 is fitted and fixed in a hole 51 of the movable iron core 5. The operating rod 6 is the main body 1
Bearing member 4 fitted in hole 14 formed at the lower end of
It is slidably supported in b. The movable iron core 5 and the operating rod 6 joined together are movable in the housing by the movable iron core 5 being supported by the bearing member 4a and the operating rod being supported by the bearing member 4b. A flange 52 is formed at an end (upper end in FIG. 1) of the movable core 5 on the side opposite to the fixed core. Flange 52 of movable core 5 and shoulder 3 of spacer 3
A return spring 8a is disposed between the movable iron core 2 and the movable iron core 2 to press the movable iron core 5 away from the fixed iron core 24. Return spring 8a
Is preferably a coil, and the material thereof can be appropriately selected according to the conditions for using a solenoid such as ordinary spring steel or stainless steel.

Between the cover 12 of the housing 10 and the spacer 3 accommodated in the housing, a large diameter portion of the stepped recess 15 having a circular cross section formed in the cover and an end of the stepped hole 31 of the spacer are formed. A storage space S defined by the parts is formed. A guide sleeve 16 made of a resin material is fitted into the space and is in contact with the inner surface of the recess 15. The shock absorber 7 is disposed in the space S. This shock absorber 7 is provided on both sides of a stopper 71 made of metal such as stainless steel, for example.
2 are joined. The stopper 71 and the buffer plate 72 have a circular planar shape, and are slidable within the guide sleeve 16. The mass m of the shock absorber 7 is equal to or less than the mass M of the movable iron core 5 and the operating rod 6.
The length L of the space S in the axial direction (moving direction of the movable iron core) and the thickness T of the shock absorber 7 are such that M is 3 gf ≦ M <1.
In the range of 0 gf, it is preferable that the relationship is 0.15 mm ≦ LT ≦ 0.75 mm. That is, the gap G between the opposite surface of the shock absorber 7 and the shoulder 18 of the cover 12 when the shock absorber 7 is in contact with the shoulder 33 of the spacer 3.
Is preferably 0.15 mm or more and 0.75 mm or less when M is 3 gf or more and less than 10 gf.

FIG. 3 is a graph showing the experimental result of the jump amount in the present embodiment. As is clear from the graph, in the curve (M = 3gf) shown by the one-dot chain line, the jump amount is approximately 0.65 mm when LT (= G) is 0.15 mm, and the jump amount is 0.75 mm when LT (= G) is 0.15 mm. It is about 0.83 mm, which is smaller than the jump amount (M = 3 g) of the conventional solenoid about 0.90 mm,
In the curve (M = 5gf) shown by the solid line, LT
Is 0.25mm, the jump amount is about 0.63mm,
At 0.78 mm, the jump amount is about 0.83 mm, which is smaller than the jump amount of the conventional solenoid (M = 5 gf) about 1.04 mm, and further, the curve shown by the two-dot chain line (M = 10 gf). , LT is 0.25
mm, the jump amount is about 0.92mm, 0.75m
At m, the jump amount is about 0.09 mm, which is smaller than the jump amount (M = 10 g) of the conventional solenoid, which is about 1.08 mm. The graph of FIG. 3 shows that 3gf ≦ M ≦ 1
It is a measurement result when 0 gf, but as a result of a similar experiment, when M is 10 gf ≦ M <20 gf, 0.75 mm ≦ LT ≦ 2.0 mm 20 gf ≦ M <50 gf, 2.0 mm It has been found that it is preferable that ≦ LT ≦ 5.0 mm. The graphs for these ranges show the same tendency as the graph of FIG. The experimental environment is room temperature -20.
° C.
No. 78.

The material of the guide sleeve is POM, P
A resin material such as BT, PPS, or PPE may be used. The material of the buffer plate 72 preferably has a low rebound resilience in order to prevent the movable iron core from bouncing or bouncing. Such a material may be urethane rubber, butyl rubber, NBR, silicone rubber, fluorine rubber, or a resin material or a resin material when the solenoid is used at room temperature, but the solenoid may be used at a high temperature such as 150 ° C. or higher. Down or -100
When used at an extremely low temperature of not more than ° C, a resin material such as polyether ether ketone (PEEK) having excellent thermal stability is preferable.

A buffer spring 8b acting opposite to the return spring 8a is arranged in the small diameter portion of the recess 15. The type of the buffer spring 8b is preferably a coil, and its material can be appropriately selected according to the conditions for using a solenoid such as ordinary spring steel or stainless steel. Spring load P of buffer spring 8b
₂ is larger than the spring load P ₁ of the return spring 8a.
Preferably, the spring load P ₂ during assembly good 2 to 3 times the spring load P ₁ is. The outer diameter D ₁ of the flange portion 52 of the movable core 5 and the center diameter D _{2 (} diameter measured between the centers of the spring materials) of the buffer spring 8 b are D ₂ ≧ 0.5D ₁
It is preferable that the following relationship is satisfied. This is to prevent the surface of the shock absorber from moving in the accommodation space without maintaining a state perpendicular to the axis OO of the movable iron core when the movable core collides with the shock absorber 7.

In the solenoid 1 of the above embodiment, the gap G is within the above range when the assembly is completed.
In this state, when the coil is not energized, the shock absorber 7 comes into contact with the shoulder 33 of the spacer 3 by the action of the buffer spring 8b, as shown in the left half of FIG. The movable iron core 5 is stopped by the return spring 8a having its end face (upper face in FIG. 1) abutting against the shock absorber 7. At this time, the operating rod 6 is at the retracted position R.

When the winding 23 of the coil 21 is energized, the movable iron core 5 is fixed iron core 24 → movable iron core 5 → magnetic frame 26
→ magnetic frame 25 → attracted to the fixed core side by the action of the magnetic flux flowing through the fixed core 24, and stopped in a state where the flange 52 of the movable core 5 is in contact with the shoulder portion 34 of the spacer 3. Thereby, the operating rod 6 is moved downward in FIG. 1 to the projecting position P, and performs a predetermined work, for example, extruding parts when the solenoid is used as a pusher for selecting parts, and also of the automatic loom. When used as a thread stop mechanism, the thread is stopped. This solenoid 1
, When the operating rod 6 protrudes (the tip is at the position P
The jumping is prevented when the fixed iron core 24
This can be performed by the magnetic attraction force of the movable iron core 5 by the above.

Next, when the energization of the coil 21 is stopped, the movable iron core 5 moves toward the shock absorber 7 by the action of the return spring 8a, and collides with the shock absorber.
Then, the shock absorber 7 oscillates with a small amplitude by pushing the buffer spring 8b within the movement range allowed in the accommodation space, that is, within the range of the gap G (see FIG. 8). The kinetic energy of the movable iron core and the operating rod is transmitted to the shock absorber and absorbed by the shock absorber and the buffer spring 8b. Finally, the shock absorber 7 returns to the shoulder 33 of the spacer 3 and its movement is stopped. For this reason, the rebound amount of the movable iron core and the operating rod fixed thereto is extremely small as compared with the conventional solenoid.

FIG. 4 and FIG. 5 show the operation waveforms of the movable iron core of the solenoid of the above embodiment and the conventional solenoid. As can be seen from the figure, the rebound of the movable core of the solenoid 1 of this embodiment, ie, the jumping amount V ₁ (FIG. 4) is much smaller than the rebound of the movable core of the conventional solenoid, ie, the jumping amount V ₂ (FIG. 5). Become.

[0022]

According to the present invention, the following effects can be obtained. (1) Since the shock absorber can vibrate with a small amplitude within the range of the gap, the amount of rebound of the movable iron core, that is, the amount of jump is reduced. Therefore, even when used as a yarn stopping mechanism of an automatic loom, it is possible to eliminate erroneous yarn control, and when used as a pusher for a sorting device, it is possible to eliminate erroneous sorting. (2) The amount of rebound of the movable core, that is, the variation of the jump amount and the change of the jump amount due to the mounting direction can be reduced. (3) Since the amount of jump of the movable iron core and the operating rod can be reduced, the operation frequency can be increased, and the operation can be speeded up. (4) The solenoid of the embodiment can be used in a bad environment.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a solenoid according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a graph showing a measurement result of a jump amount of the solenoid of the present invention.

FIG. 4 is a diagram showing a speed and an operation waveform of a movable iron core of the solenoid of the embodiment shown in FIG. 1;

FIG. 5 is a diagram showing a speed and an operation waveform of a movable iron core of a conventional solenoid.

FIG. 6 is a cross-sectional view showing an example of a conventional thread stopping mechanism.

FIG. 7 is a cross-sectional view showing an example of a pusher of a prior art component sorter.

FIG. 8 is a diagram showing a vibration waveform of the shock absorber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solenoid 10 Housing 11 Main body 2 Electromagnet assembly 21 Coil 23 Winding 24 Fixed iron core 25, 26 Magnetic frame 3 Spacer 4a, 4b Bearing member 5 Movable iron core 51 Hole 52 Flange 6 Operating rod 7 Shock absorber 71 Stopper 72 Buffer plate 8a Return spring 8b Buffer spring

Claims (5)

(57) [Claims] 1. A hollow coil disposed in a housing, a fixed iron core inserted in the coil, a magnetic frame made of a magnetic material magnetically connected to the fixed iron core and surrounding the coil, A movable core disposed in the housing so as to be able to move away from and close to the fixed core, an operating rod attached to the movable core and extending through a through hole of the fixed core, and a direction for moving the movable core away from the fixed core. A return spring that resiliently presses the work rod, and performs a work by reciprocating operation of the operating rod. In the solenoid, a shock absorber that is configured to be pushed by an end of the movable iron core is disposed, and A shock absorber is movably disposed in a housing space formed in the housing, and the shock absorber is a buffer spring having a larger spring load than the return spring and is opposite to the return spring. Solenoids, characterized in that oppressed direction, and the mass m of the shock absorbing body is smaller than the mass M a combination of the actuating rod and the movable iron core. 2. The solenoid according to claim 1, wherein
The housing has a main body and a cover attached to the main body, a spacer is disposed between the coil and the cover, and the housing space is formed between the cover and the spacer; When the length L of the movable iron core in the moving direction and the thickness T of the shock absorber are 3 gf ≦ M <10 gf, 0.15 mm ≦ LT−0.75 mm 10 gf ≦ M <20 gf 0. 75 mm ≦ LT ≦ 2.00 mm When 20 gf ≦ M <50 gf A solenoid that satisfies 2.00 mm ≦ LT ≦ 5.00 mm. 3. An attraction surface of the fixed core is retracted inward from an end surface of the coil, a replaceable resin bearing member is inserted into the coil, and the movable core is slidably moved by the bearing member. The solenoid according to claim 1 or 2 , wherein the operating rod is supported and slidably supported by a bearing member disposed at an end of the housing. 4. The solenoid according to claim 1, wherein the shock absorber has a central stopper,
A solenoid plate provided with buffer plates disposed on both sides of the stopper. 5. The solenoid according to claim 1, wherein said movable iron core hits said shock absorber.
The outer diameter D ₁ of the flange portion and the center between the diameter D ₂ of the buffer spring is a solenoid is D ₂ ≧ 0.5 D _1.