JP2005285026A - Punch solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid which can be assembled by a small number of assembly man-hours by decreasing the number of components less than a general punch solenoid thereby enables burden for the assembly to be reduced as much as possible, and which is also efficient. <P>SOLUTION: In the solenoid, a magnetic pole part 12a, a die 12b, a punch hole 12c, a slit part 12d and a housing hole 12e of a fixed magnetic pole 12 are machined or molded from the same base material, so that a positional deviation between components during assembly can be eliminated and that burden for the assembly can be reduced. Furthermore, efficiency of a magnetic circuit of magnetic flux circulated through a case 11, a movable magnetic pole 13 and the fixed magnetic pole 12 can also be improved. Moreover, surface hardening treatment is applied to a shaft 14 or the fixed magnetic pole 12 or plating is applied to the fixed magnetic pole 12 to make the surface state smooth, so that durability can be improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a punch solenoid, and more particularly to a structure of a member centered on a fixed magnetic pole and a movable magnetic pole.

  The basic structure of the punch solenoid is as follows: a case that serves as a housing for the solenoid, a coil that generates magnetic flux, a movable magnetic pole that operates by generating magnetic flux, a fixed magnetic pole that forms a magnetic circuit together with the movable magnetic pole, a shaft that is fixed to the movable magnetic pole, At the tip of the shaft, a punch pin for making a hole in the magnetic card, a punch hole provided so as to be able to be inserted through the punch pin, a slit portion where the magnetic card travels, and a spring for returning the movable magnetic pole to its original position are formed.

  In general operation of the punch solenoid, when a current is passed through the coil, the movable magnetic pole is attracted to the fixed magnetic pole, and at the same time, the shaft fixed to the movable magnetic pole moves through the receiving hole of the fixed magnetic pole. At the same time, the punch pin at the tip of the shaft moves toward the slit portion, and a hole is made in the magnetic card inserted there, and is inserted through the punch hole. Then, by turning off the coil current, the force of the return spring works and the punch pin returns to its original position.

However, from the viewpoint of improving the assembly performance of the punch solenoid, the slit portion called the die and the punch hole portion are separated from the fixed magnetic pole. (For example, Patent Document 1).
Patent Document 1 is an example of a punch solenoid. Here, the die is separated from the fixed magnetic pole, and is integrated in the course of assembling the punch solenoid. However, there is a burden that the solenoid body must be assembled while accurately managing the positional relationship between the radial direction and the axial direction of the solenoid body, and it cannot be said that the efficiency is very good even on a magnetic circuit around which magnetic flux circulates.
JP-A-61-5112f5 (4 pages, FIG. 1)

  The present invention has been made in view of the above-described circumstances. The number of parts is reduced by reducing the number of parts as compared with a general punch solenoid, and the burden on the worker at the time of assembling is reduced as much as possible. An object is to provide a solenoid.

In order to solve the above-mentioned problem, a coil, a case that covers the coil from the upper surface side end surface to the outer periphery, a fixing unit that covers the lower surface side end surface of the coil together with the case and can be inserted with a magnetic card A magnetic pole, a movable magnetic pole disposed so as to face the magnetic pole portion of the fixed magnetic pole in the direction of the moving axis, and a shaft fixed to the hole portion of the movable magnetic pole and provided with a punch pin for forming a thin hole at a lower end on the lower surface side In the solenoid, the fixed magnetic pole has a storage hole for storing the shaft in a state where the shaft can be inserted, and a punch hole that faces the storage hole through the slit and can be inserted into the punch pin of the shaft, The fixed magnetic pole is formed by cutting or molding a portion around the slit portion and the punch hole from the same base material as the magnetic pole portion. And it shall be characterized in that the.

  Further, in the above structure, the shaft is subjected to a surface hardening treatment, and then the punch pin is polished, the fixed magnetic pole is subjected to a surface hardening treatment, or at least the slit portion of the fixed magnetic pole is plated. It is also possible to apply. Further, the receiving hole of the fixed magnetic pole has two portions having different inner diameters, the first portion having a smaller diameter is located on the lower surface side of the shaft, and the second portion having a larger diameter is on the upper surface side of the shaft. It is also possible to arrange them in

  The present invention cuts or molds the housing hole in the fixed magnetic pole, the slit portion into which the magnetic card is inserted, the punch hole and the magnetic pole portion from the same base material, so that the housing hole, the slit portion, the punch hole and the magnetic pole portion are formed. The positional relationship can be accurately managed at the time of machining, the burden on the operator when assembling the solenoid is reduced, work efficiency can be improved, and the magnetic circuit of the magnetic flux around the movable magnetic pole, fixed magnetic pole and case In this case, the efficiency can be improved.

  In addition, the durability of the shaft and fixed magnetic pole is improved by applying a surface hardening treatment, and the magnetic card is slippery by plating the slit part, so that the slit part and the magnetic card itself can be operated without damaging them. Can do.

  In the embodiment of the present invention, the storage hole, the slit part, the punch hole, and the magnetic pole part in the fixed magnetic pole are cut or molded from the same base material into one part, so that the operator is positioned during the assembly process. It is characterized by the ability to manufacture punch solenoids without worrying about the relationship. An embodiment having this feature will be described below.

  FIG. 1 is an explanatory diagram of a punch solenoid according to a first embodiment of the present invention. In FIG. 1, 10 is a punch solenoid, 11 is a case, 12 is a fixed magnetic pole, 12a is a magnetic pole part of the fixed magnetic pole, 12b is a die, 12c is a punch hole, 12d is a slit part, 12e is a storage hole, 13 is a movable magnetic pole, Reference numeral 14 denotes a shaft, 14a denotes a punch pin, 15 denotes a return spring, 16 denotes a bobbin, 17 denotes a coil, 21 denotes a magnetic card, 22 denotes an air gap spacer, 23 denotes a washer, 24 denotes a stopper, and 26 denotes a lead wire. Further, the upper side shown in FIG. 1 is the upper surface side, and the lower side is the lower surface side, and the same applies to other drawings.

  In the punch solenoid 10, a magnetic pole portion 12a constituting a fixed magnetic pole 12 and a die 12b having a punch hole 12c are processed from one base material, and a magnetic guard is provided between the magnetic pole portion 12a and the die 12b. A slit portion 12d into which 21 is inserted is provided. Further, a storage hole 12e is provided on the upper surface side of the slit portion 12d, and the shaft 14 is inserted into the storage hole 12e in a movable state. The shaft 14 has a punch pin 14a at the tip, and the punch pin 14a can be inserted into the punch hole 12c.

  In the first embodiment of the present invention, the magnetic pole portion 12a and the die 12b of the fixed magnetic pole 12 are formed of the same base material, and therefore can be assembled without adjusting the positions of the punch hole 12c, the punch pin 14a, and the slit portion 12d. It is characterized by.

  Below, the main structures of the punch solenoid 10 are demonstrated.

  The case 11 is made of a magnetic material, and is provided so as to cover the coil 17 from the upper surface side end surface to the outer periphery. A stopper 24 is fixed to the upper end surface, and an air gap spacer 22 is arranged on the same end surface. On the lower surface side, the fixed magnetic pole 12 is fixed to the inner periphery, and when a current flows through the coil 17, it forms a magnetic circuit together with the fixed magnetic pole 12 and the movable magnetic pole 13.

  The fixed magnetic pole 12 is made of a magnetic material, and is provided with a magnetic pole part 12a, a die 12b, a punch hole 12c, a slit part 12d, and a storage hole 12e. In the magnetic pole portion 12a, one end of the return spring 15 is locked, and is arranged so as to face the movable magnetic pole 13 in the axial direction. A storage hole 12e through which the shaft 14 can be inserted is arranged at the center and penetrates to the slit portion 12d. The slit portion 12d is located between the magnetic pole portion 12a and the die 12b, and a punch hole 12c into which the punch pin 14a can be inserted is provided at the center in the axial direction of the die 12b. The punch hole 12c has a small dimensional difference of several tens of μm from the punch pin 14a, so that the hole to the magnetic card 21 is efficiently formed. Further, the fixed magnetic pole 12 is fixed to the case 11 at the outer periphery, and forms a magnetic circuit of the case 11 and the movable magnetic pole 13 when a current is passed through the coil.

  Since the fixed magnetic pole 12 is cut or molded from one material, the positional relationship among the magnetic pole part 12a, the punch hole 12c, the slit part 12d, and the storage hole 12e can be accurately created, and consideration is given so that each function can be exhibited. it can. For example, since the magnetic pole portion 12a is not divided from the fixed magnetic pole 12, the magnetic circuit of the case 11 and the movable magnetic pole 13 can be configured efficiently. Further, as described above, the punch pins 14a and the punch holes 12c must be inserted with very strict dimensional differences, so that this portion needs to be processed with higher accuracy. By cutting or molding from one material, the concentricity of the accommodation hole 12e and the punch hole 12c of the fixed magnetic pole 12 can improve the processing accuracy.

  Further, when machining a complicated structure such as the fixed magnetic pole 12, free-cutting steel materials SUM23 and SUM24 with good workability are suitable. Since this material can be subjected to surface hardening treatment or plating, the material itself can be hardened and the surface can be smoothed. For example, surface hardening generally has a treatment called tuftride, nickel plating is mainly used for plating to smooth the surface, and fluororesin is used for coating. By applying these surface treatments, scratches due to contact with the magnetic card 21 are reduced, and the magnetic card 21 is not easily scratched and is in a slippery direction, thereby improving the durability of each other.

  The movable magnetic pole 13 is made of a magnetic material and has a T shape. A shaft 14 is fixed to the central hole portion of the shaft, a return spring 15 is inserted, and one end of the movable magnetic pole 13 is locked. In addition, a hole is formed in a portion that becomes a ridge portion, and a stopper 24 is inserted. When no current is flowing, the return spring 15 urges the movable magnetic pole 13 toward the upper surface, so that the stepped end surface of the stopper 24 and the movable magnetic pole 13 are in contact. Further, when a current is passed through the coil 17, a magnetic circuit of the fixed magnetic pole 12 and the case 11 is configured.

  The shaft 14 is made of a non-magnetic material that can be surface hardened, and is fixed to the center of the movable magnetic pole 13 in the axial direction, and a punch pin 14a having a small diameter is formed at the lower end on the lower surface side. The punch pin 14a at the tip on the lower surface side can be inserted into the housing hole 12e formed in the fixed magnetic pole 12 with a dimensional difference of several tens of μm from the punch hole 12c. When the movable magnetic pole 13 is attracted to the fixed magnetic pole 12, the shaft 14 also moves to the lower surface side at the same time, and the punch pin 14a passes through the magnetic card 21 inserted into the slit 12d and is inserted into the punch hole 12c.

  The coil 17 is located on the outer peripheral side of the magnetic pole portion 12 a of the fixed magnetic pole 12 and is covered with the case 11. When a current is passed through the coil 17, a magnetic circuit of the fixed magnetic pole 12, the case 11, and the movable magnetic pole 13 is configured.

  One end of the return spring 15 is locked to the magnetic pole portion 12a of the fixed magnetic pole 12, and the other end biases the movable magnetic pole 13 to the upper surface side. When a current flows through the coil 17, the magnetic pole portion 12 a of the fixed magnetic pole 12 attracts the movable magnetic pole 13, and the return spring 15 is in close contact with the attractive force. Push.

  The stopper 24 is fixed to the end surface on the upper surface side of the case 11 and is inserted into a part of the collar portion of the movable magnetic pole 13. Further, since the stopper 24 has a stepped shape, the movable magnetic pole 13 urged to the upper surface side by the return spring 15 is brought into contact with the stepped end surface to limit the movement of the movable magnetic pole 13.

  The washer 23 is made of a non-magnetic material, is located between the stopper 24 and the movable magnetic pole 13, and is used for buffering both.

  The air gap spacer 22 is formed of a nonmagnetic material so that the movable magnetic pole 13 and the case 11 and the fixed magnetic pole 12 do not directly contact each other.

  As described above, the most important part of the punch solenoid 10 is how to efficiently punch the magnetic card 21 in which the punch pin 14a is inserted into the slit portion 12d. FIG. 2 shows the state at the time of demagnetization and at the time of excitation-drilling. The punch pin 14a moves as far as possible in the axial direction with respect to the punch hole 12c, punches out the magnetic card 21, and the punch hole 12c. It is necessary to pass through. In short, by forming the magnetic pole portion 12a and the die portion 12b from the same base material, the functions of important portions can be sufficiently satisfied.

  FIG. 3 is an explanatory diagram of a punch solenoid according to a second embodiment of the present invention. In FIG. 3, the reference numerals indicate the same as those in FIG.

  3 has the same basic structure as FIG. 1, but a small hole 12f is provided in the housing hole 12e of the fixed magnetic pole 12 so that the punch pin 14a of the shaft 14 is inserted from the middle of the lower surface side. In this case, the punch pin 14a is inserted through the hole 12f, penetrates the magnetic card 21, and is further inserted into the punch hole 12c of the fixed magnetic pole 12. The punched-out magnetic card 21 is discharged from the punch hole 12c, but even if it remains in the slit portion 12d, the possibility of entering the storage hole 12e becomes very low. Further, since the lubricant is applied to the shaft 14 in order to improve the slidability with the storage hole 12e, the lubricant is prevented from scattering from the storage hole 12e when the shaft 14 moves on the lower surface side, and the magnetic card 21 is used. We are careful not to pollute it.

It is explanatory drawing of the punch solenoid which concerns on the 1st Example of this invention. It is explanatory drawing which shows operation | movement of the punch solenoid shown in FIG. It is explanatory drawing of the punch solenoid which concerns on the 2nd Example of this invention. It is explanatory drawing of the conventional punch solenoid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Punch solenoid 11 Case 12 Fixed magnetic pole 12a Fixed magnetic pole part 12b Die 12c Punch hole 12d Slit part 12e Storage hole 12f Hole 13 Movable magnetic pole 14 Shaft 14a Punch pin 15 Return spring 16 Bobbin 17 Coil 21 Magnetic card 22 Air gap spacer 23 Washer 24 Stopper 26 Lead wire

Claims (6)

Coils,
A case covering the coil from the upper surface side end surface to the outer periphery;
A fixed magnetic pole provided with a slit portion that covers the lower end surface of the coil together with the case and into which a magnetic card can be inserted;
A movable magnetic pole arranged to face the magnetic pole portion of the fixed magnetic pole in the direction of the movement axis;
In the solenoid having a shaft fixed to the hole portion of the movable magnetic pole, and the lower end on the lower end is provided with a punch pin for narrow hole drilling,
The fixed magnetic pole has a storage hole for storing the shaft in a state in which the shaft can be inserted, and a punch hole that faces the storage hole through the slit and can be inserted into the punch pin of the shaft,
The solenoid in which the fixed magnetic pole is formed by cutting or molding a portion around the slit portion and the punch hole from the same base material as the magnetic pole portion. The solenoid according to claim 1, wherein the shaft is subjected to a surface hardening process.   3. The solenoid according to claim 1, wherein the punch pin is polished after the surface of the shaft is hardened. 4.   The solenoid according to claim 1, wherein the fixed magnetic pole is subjected to a surface hardening process.   5. The solenoid according to claim 1, wherein at least the slit portion of the fixed magnetic pole is plated.   In the solenoid, the accommodation hole of the fixed magnetic pole has two portions having different inner diameters, a first portion having a small diameter is located on the lower surface side of the shaft, and a second portion having a large diameter is the shaft. The solenoid according to claim 1, wherein the solenoid is disposed on an upper surface side of the first and second surfaces.

Images