JPH11328772A - Solenoid device for magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cutting generated when an action is repeated between the joined part of a pin fixed to a plunger and a member with which the pin is engaged in a solenoid device used for a magnetic recording/reproducing device. SOLUTION: This device is provided with a pin 30 made of a hollow pipe material which has a joined part 30a fixed to the tip of a plunger 12 of a solenoid, the joined part 30a of the pin 30 is at an angle of nearly 45 deg. to the moving direction Y of the plunger 12 and the joined part 30a is positioned so that the joined part 30a is not brought into contact with the end surface of a groove 22 of an arm 19 engaged with the pin 30. Thus, even when the attracting action of the solenoid 10 is repeated, the end surface of an oblong hole 16 or the end surface of the groove 22 is not cut by the joined part 30a and the high reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid device used for a pinch roller pressing mechanism of a magnetic recording / reproducing apparatus for recording / reproducing a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, there has been known a method in which a through hole is provided in a plunger of a solenoid, a pin is pressed into the through hole, and an arm or the like is engaged with the pin to transmit the movement of the plunger. . After the plunger is processed, molybdenum disulfide or Teflon is generally applied to the surface of the plunger to enhance the slidability. As a result, the hole size of the through-hole is likely to change from the dimension at the time of processing, and the press-fit pin is a hollow pipe material having a connecting portion in the axial direction such as a spring pin in order to secure a removal force at a low cost. Often used.

FIGS. 6 to 8 show a structure for pressing a pinch roller to a capstan as an example of a solenoid device of a conventional magnetic recording / reproducing apparatus. In FIG. 6, 1
Is a pinch roller, which is rotatably provided at one end of the pinch arm 3. The pinch arm 3 is rotatably locked around a shaft 4 implanted on a base. 2 is a capstan. Reference numeral 10 denotes a solenoid, and a through hole 13 is provided at a tip end of the plunger 12, and a pin 15 made of a hollow pipe material having a connecting portion 15a in the axial direction is press-fitted into the through hole 13. I have.

When the solenoid 10 is excited, the plunger 12 is moved to the solenoid body 1 as shown in FIG.
At the same time, the spring 14 wound around the outer periphery of the plunger 12 is compressed between the solenoid body 11 and the pin 15. When the excitation is stopped, as shown in FIG. 7, the plunger 12 is pushed back from the solenoid body 11 by the force of the spring 14 (in the non-excitation state,
Also called a return state).

Below the pin 15, an elongated hole 16 slightly larger than the movement range of the pin 15 is formed in a member 17 integral with the solenoid body 11, and the elongated hole 16 has a pin 15 formed therein. Are engaged so that the pin 15 always moves vertically.

Reference numeral 18 denotes a support shaft implanted on a base. A pair of arms 19 and 20 are rotatably provided around the support shaft 18 so as to be in a plane parallel to the moving surface of the plunger 12. At this time, a tension spring 21 is stretched between the arms 19 and 20, and the arms 19 and 20 usually rotate integrally. A groove 22 is formed at one end of one arm 19, and the pin 1 is inserted through the groove 22.
5 is engaged. An elongated hole 23 is formed at one end of the other arm 20, and engages with the pin 5 implanted in the pinch arm 3 via the elongated hole 23.

The operation of the above configuration will be described. The pinch arm 3 is previously rotated clockwise about the shaft 4 by a required amount by driving means (not shown). Then, as the pinch arm 3 rotates, the pin 5 moves in the elongated hole 23 and stops while slightly pressing the wall 23a of the elongated hole 23. When the solenoid 10 is excited in this state, the plunger 12 is attracted, and the pin 15 fixed to the plunger 12 also moves. Since the pin 15 is engaged with the groove 22 of one arm 19, the arms 19 and 20 rotate around the support shaft 18 in a counterclockwise direction. As a result, the wall 23b of the long hole 23 of the other arm 20 presses the pin 5, whereby the pinch arm 3 rotates clockwise around the axis 4, and the pinch roller 1 comes into contact with the capstan 2. .

When the plunger 12 is further sucked and attracted to a plunger receiver (not shown) in the solenoid 10, one arm 19 further rotates counterclockwise, and the other arm 20 pushes the pin 5 by the wall 23b. Although the pinch roller 1 is pressed, it does not rotate because the pinch roller 1 is in contact with the capstan 2, and the tension spring 21 expands, and the force becomes the pressing force between the pinch roller 1 and the capstan 2, and the state shown in FIG. Becomes

In FIG. 8, a groove 22 provided in one arm 19 is generally formed so as to make an angle of approximately 90 ° with respect to the moving direction Y of the plunger 12. At this time, the suction force of the solenoid 10 becomes maximum, and the tension spring 21
The pin 15 presses the end face of the groove 22 of the one arm 19 with a force larger than the force of the first arm 19, but the pin 15 presses the end face of the groove 22 in the vertical direction, so that the attraction force of the solenoid 10 is efficiently increased. This is because the force is converted into a force for rotating the arm 19.

By such an operation, the pinch roller 1
The magnetic tape 8 is sandwiched between the magnetic tape 8 and the capstan 2, and the magnetic tape 8 is driven by the rotation of the capstan 2. When the excitation of the solenoid 9 is stopped, the force of the spring 14
2 is pushed back, and both arms 19 and 20 rotate clockwise around the support shaft 18. As a result, the pin 5 is not pressed by the wall 23b, and the other end of the pinch arm 3 and the other member 6
The pinch arm 3 rotates counterclockwise around the shaft 4 by the force of the return spring 7 suspended between the pinch roller 3 and the pinch roller 1 as shown in FIG.

[0011]

In the above-mentioned conventional solenoid device of a magnetic recording / reproducing apparatus, the solenoid 1
Each time 0 is excited and the excitation is stopped, the pin 15 slides on the end face of the long hole 16 of the member 17 and on the end face of the groove 22 of one arm 19. At this time, pin 15
Is generally formed of a hollow pipe material having a connecting portion 15a, and the connecting portion 15a is likely to have a sharp end face.

Therefore, when the connecting portion 15a comes into contact with the end face of the slot 16 or the end face of the groove 22, as the number of repetitions of the operation increases, the connecting portion 15a or the end face is cut off. Changes the shape of
As a result, there has been a problem that a reliable operation cannot be performed, or shaving powder is scattered, and the powder enters gaps or the like of other mechanism parts to cause a malfunction.

An object of the present invention is to provide a solenoid device of a magnetic recording / reproducing apparatus which can prevent abrasion even if the number of sliding operations increases and can realize a reliable operation.

[0014]

To solve this problem, a solenoid device of a magnetic recording / reproducing apparatus according to the present invention has a groove formed in an arm to be engaged with a pin. It is located at an angle of approximately 90 ° with respect to the direction of movement of the jar, and the connecting portion of the pin is arranged at an angle of approximately 45 ° with respect to the direction of movement of the plunger so as not to contact the end face of the groove of the arm. is there.

[0015] With this configuration, it is possible to prevent the connecting portion of the pin from slidingly contacting another member, to prevent scraping, and to always obtain a reliable operation.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a solenoid plunger which has a through hole near the tip thereof and moves linearly, and which is engaged with the plunger through the through hole and is axially locked. A pin made of a hollow pipe material having a connecting portion, a member having an elongated hole formed slightly larger than a range in which the pin moves and engaging with the pin, and a rotatable pivot about a support shaft from the base side. An arm provided with a groove that rotates in a plane parallel to the moving surface of the plunger and has an end formed with a groove that engages with the pin. The groove is provided when the plunger is sucked. Positioned at approximately 90 ° with respect to the direction of movement of the plunger, the connecting portion of the pin is arranged at an angle of approximately 45 ° with respect to the direction of movement of the plunger so as not to contact the end face of the groove of the arm. Did A solenoid device for a magnetic recording / reproducing apparatus characterized in that when a plunger is suction-returned, a pin connecting portion does not come into contact with an end surface of a long hole or an end surface of a groove portion of an arm.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) Hereinafter, Embodiment 1 will be described with reference to FIGS. In the first embodiment, the components having the same reference numerals as those in the conventional example have the same functions as those in the conventional example, and thus the description thereof will be omitted, and only the portions different from the conventional example will be described below.

In FIG. 1, reference numeral 30 designates a pin fixed to the plunger 12, but differs from the conventional example only in the position of the connecting portion 30a. FIGS. 2 and 3 show a conventional example.
FIG. 4 is a plan view in which the direction of a connecting portion 30a of the pin 30 is different. 2 and 3, the plunger 12 moves in the Y direction, and the connecting portion 30a of the pin 30 is
2 is oriented at approximately 45 ° to the movement direction Y (details will be described later).

In the configuration of the first embodiment, when the solenoid 10 is excited as in the conventional example, the plunger 12 is attracted to the pin 3 as shown in FIG.
0 moves along the long hole 16 and turns one arm 19 counterclockwise. Further, when the excitation of the solenoid 10 is stopped, the plunger 12 returns and the one arm 19 is returned.
Rotates clockwise.

FIG. 4 is a diagram showing the relationship between the pins 30 and the slots 16. In FIG. 4, the direction A of the connecting portion 30 a is substantially 45 ° with respect to the moving direction Y of the plunger 12. At this time, the contact range between the end face of the groove portion 22 of the one arm 19 and the pin 30 is determined from the contact point C1 between the end face of the groove portion 22 of the one arm 19 and the pin 30 when the plunger 12 returns. The contact range C between the end surface of the groove 22 of the one arm 19 and the contact point C2 between the pin 30 and the pin 30 when the arm 12 is sucked.

From the above positional relationship, the connecting portion 3 of the pin 30
The direction A of 0a does not come into contact with both end surfaces 16a and 16b of the long hole 16 and does not come into contact with the end surface of the groove portion 22 because it is out of the contact range C. Note that, in FIGS. 1 to 3, the direction of the connecting portion 30 a is indicated by the direction A, but as shown in FIG.
The Aa direction may be displaced by 80 ° and make approximately 45 ° with the movement direction Y of the plunger 12.

In general, the end face 16b of the elongated hole 16 is generally formed to be larger than the moving range of the pin 30. This is because, in the suction direction of the plunger 12, the plunger receiver (not shown) inside the solenoid and the plunger 12
The pin 30 stops at the position where the
In the return direction of 2, the pinch arm 3 is often provided with a stopper (not shown) in order to secure the positional accuracy of the pinch arm 3 of the pinch roller 1, and when the pinch arm 3 is fixed, both arms 19, 20 are provided. This is because the pin 30 stops via the pin.

Accordingly, the end face 16b of the long hole 16 has not been in contact with the pin 30 in many cases.
Since the position of the connecting portion 30a at 0 is made substantially 45 ° with respect to the moving direction Y of the plunger 12, the connecting portion 30a at which the end face 16b and the pin 30 are in contact makes the end face 1a.
6b. As a result, even if the stop position of the pin 30 is determined by the end face 16b when necessary for design, the end face 16b is not cut off by the connecting portion 30a, and a reliable operation can be obtained.

(Embodiment 2) Embodiment 1 described above
In FIGS. 1 to 4, the position of the shaft 4 for rotating the arms 19 and 20 is described on the left side of the solenoid 10, but the position of the shaft 4 for rotating the arms 19 and 20 is When it is on the right side of the solenoid 10, the positional relationship is left-right symmetric. FIG. 5 shows a relationship diagram between the pins and the long holes in that case.

In FIG. 5, the direction B of the connecting portion 30a is shown.
Is approximately 45 ° with respect to the movement direction Y of the plunger 12.
Is facing. At this time, the groove 22 of one arm 19
Is in the range of C, and does not contact the connecting portion 30a. In addition, the connecting portion 30a does not contact the end surfaces 16a and 16b of the long hole 20. In FIG. 5,
The direction of the connecting portion 30a may be a Ba direction that is displaced by 180 ° and makes approximately 45 ° with the movement direction Y of the plunger 12.

Through the above operation, the connecting portion 3 of the pin 30
0 a does not come into contact with the end faces 16 a and 16 b of the long hole 16, nor does it come into contact with the end face of the groove 22 of one arm 19. Therefore, the connecting portion 30a of the pin 30 does not cut the end surfaces 16a and 16b of the long hole 16 or the end surface of the groove portion 22 of the one arm 19.

[0027]

As described above, according to the present invention, even if the plunger operation is repeated due to the repetition of the operation of energizing the solenoid and stopping the excitation, the connecting portion of the pin of the plunger can be connected to another pin. There is an advantageous effect that a change in shape and generation of shavings caused by the contact can be prevented without contacting the member, and a highly reliable device can be provided with a simple configuration.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a perspective view of a solenoid device of a magnetic recording / reproducing apparatus.

FIG. 2 shows the first embodiment of the present invention, and is a plan view of a solenoid device of a magnetic recording / reproducing apparatus in a non-excited state.

FIG. 3 shows the first embodiment of the present invention, and is a plan view of a solenoid device of a magnetic recording and reproducing apparatus in an excited state.

FIG. 4 shows the first embodiment of the present invention, and is a relational diagram of pins and slots in a solenoid device of a magnetic recording / reproducing apparatus.

FIG. 5 shows a second embodiment of the present invention, and is a relational diagram of pins and slots in a solenoid device of a magnetic recording / reproducing apparatus.

FIG. 6 shows a conventional example, and is a perspective view of a solenoid device of a magnetic recording / reproducing apparatus.

FIG. 7 shows a conventional example, and is a plan view of a solenoid device of a magnetic recording / reproducing apparatus in a non-excited state.

FIG. 8 shows a conventional example, and is a plan view of a solenoid device of a magnetic recording / reproducing apparatus in an excited state.

[Explanation of symbols]

 Reference Signs List 1 pinch roller 2 capstan 3 pinch arm 5 pin 8 magnetic tape 10 solenoid 12 plunger 13 through hole 14 spring 16 long hole 16a long hole end surface 16b long hole end surface 17 member 18 support shaft 19 arm 20 arm 21 tension spring 22 groove portion 23 Long hole 30 Pin 30a Connecting part Y Plunger moving direction A Connecting part direction Aa Connecting part direction B Connecting part direction Ba Connecting part direction C Contact range

Claims (1)

[Claims] 1. A solenoid plunger having a through hole near its tip and linearly moving, a pin made of a hollow pipe material which is locked through the through hole and has a connecting portion in the axial direction, A member that is formed slightly larger than the range in which the pin moves and has an elongated hole that engages with the pin; and a member that is provided rotatably around a support shaft from the base side and is parallel to the moving surface of the plunger. And an arm having a groove formed at one end thereof for engaging with the pin, wherein the groove is positioned substantially 90 ° with respect to the direction of movement of the plunger when the plunger is sucked. Wherein the connecting portion of the pin is disposed at an angle of approximately 45 ° with respect to the direction of movement of the plunger so as not to contact the end surface of the groove of the arm. Apparatus.