JPS5868912A - Switching type electromagnetic plunger - Google Patents

Abstract

PURPOSE:To automatically switch over a trigger operation and a lock operation to each other, by a method wherein a yoke having two magnetic paths is provided with an excitation coil wound on a part thereof common to both the magnetic paths, and a movable core is provided in one of the magnetic paths higher in magnetic reluctance. CONSTITUTION:A unitary body of a magnet 4 having an S pole and an N pole magnetized opposite to each other and a fan-shaped cam 5 is provided in the magnetic path of a part 12 of a double ?-shaped yoke 11 lower in magnetic reluctance than the other part. A sector gear 1 is provided around the magnet 4. A gear 6 driven by a motor is disposed at a position opposite to the gear 1. Moreover, a movable core 32 is provided in the magnetic path of a part 13 of the yoke 11 higher in magnetic reluctance, and a coil 15 is wound on a part 14 of the yoke 11 common to both the magnetic paths. When the coil 15 is applied with a current, the magnet 4 is subjected to a clockwise rotational force, causing the gears 6 and 1 to engage with each other to rotate. When the magnet 4 rotates one-half turn, a head 19 is moved to the operating position and at the same time, the movable core 32 is attracted to the yoke 11, causing the head 19 to be locked.

Description

[Detailed description of the invention]

The present invention is most suitable for application to an electromagnetic plunger such as a mode switching mechanism in a recording/reproducing device such as a tape recorder or VT)L, and is suitable for application to an electromagnetic plunger such as a mode switching mechanism in a recording/reproducing device such as a tape recorder or VT)L, and by energizing one excitation coil, two magnetic paths are connected. This invention relates to a switching type electromagnetic plunger that can automatically switch between e and end flows. Conventionally, for example, there have been nine studies related to the mode switching mechanism of tape recorders.
A partially toothed gear, a magnet provided integrally with the partially toothed gear, a cam member, a drive gear provided facing the partially toothed gear, and a yoke portion facing the magnet for excitation. It has an electromagnet around which a coil is wound, and when the coil is energized, the attractive force or repulsive force acting on the magnet causes the partially toothed gear to mesh with the drive gear and be rotationally driven to engage with the cam member. Some control devices are designed to move a controlled member from a non-operating position to an operating position by displacing a matching switching lever. According to this conventional example, it is possible to impart a rotational force, that is, a mechanical trigger, to the partially toothed gear by energizing the electromagnet, which is very convenient. It is used only as a means for generating a trigger, and the structure tends to be complicated, requiring a separate locking mechanism, for example, to lock the controlled member in the operating position. The present invention was invented in view of the above-mentioned circumstances, and when used, for example, in the mode switching mechanism described above, the present invention automatically controls the mechanical trigger operation and the locking operation at the operating position of the controlled member 2. The purpose of the present invention is to provide a switching type electromagnetic plunger that has a switching effect that can be switched between the two directions. An embodiment in which the present invention is applied to a mode switching mechanism of a tape recorder will be described below with reference to the drawings. First! In Fig. 1, (1) is a partially toothed gear, which has a notch (2) in a part of the curved surface and is rotatably supported by a rotating shaft (31). A magnet (41) and a fan-shaped cam (5) are integrally provided, with the S and N poles facing each other. It is a drive gear provided as a drive gear, and is configured to be rotatably supported by a drive shaft 171 and rotationally driven by a drive motor (not shown).OQI is an electromagnetic plunger (electromagnet), The yoke, aIJ, is formed in a double U-shape, and the first yoke part (121) forming the first magnetic path has a magnetic resistance of, for example, #l compared to the first magnetic path. !] yoke part (121i, there is a method of changing the material with the second yoke part a3 or changing the shearing area.And the common part of the yoke part az of #!1 and the second yoke part αJ An excitation coil +151 is wound around 041. Also, both MAt12aJ (12b
J is placed facing the magnet (4). The iron core is a stabilizing iron core, and is attached to both ends of the first yoke part (1
211) (12b) is placed opposite the magnet (41) at a position corresponding to the y-center. (181 is a head substrate which is an example of a controlled member,
A magnetic head a9 and a pinch roller (λ, not shown) etc. are attached to the top of the head board a&.
It is configured to be able to freely reciprocate in the directions indicated by the arrows and b, and is biased in the direction indicated by the arrow by a spring for double movement. 1 is a switching lever, which is swingably supported by a fulcrum shaft (c). And the switching lever @ -118 <2
Zano is engaged with cam +51Kt, fill (22b)
is engaged with a retaining portion (to) provided integrally with the head substrate Q&. (To) is a shaft lever, which is swingably supported by a shaft shaft. This lock lever (c) is rotated in the direction of arrow C by a spring @, and the pin provided on it is brought into contact with the regulating part (to) provided on the head board at 0 seconds. Rotation in the C direction is restricted. 6 is a movable iron core held at the bottle mouth by the photoelectric of the lock lever (to), and this movable iron core is connected to the second yoke part Q.
3 (0 cars 91J (13aJ (13b) Then, the second yoke part αJ

[The second magnetic path that is formed is configured so that it can form a closed magnetic path with a lower magnetic resistance than the second magnetic path that is formed at the first yoke portion. There is. Next, a mode switching operation by the mode switching mechanism configured as above will be explained. First, when the tape recorder is in the 5TOP mode and power is not supplied, the drive gear 1610 is driven by the motor.
Stirring has been stopped. And in this state #! ] As shown in the figure, the partially toothed gear +1') faces the drive gear (6) through the notch (21), and these are in a non-meshing state. It is stabilized by being attracted to the stabilizing iron core (161).In other words, in this state, the partially toothed gear Il+ is stabilized (magnetically locked) by magnetic force, and its structure is extremely weak compared to those that are mechanically stabilized. In addition, in this state, the magnet (S pole of 41, N1#A and chisel 1 pole are the first (D!-?
It is stabilized in a direction perpendicular to the direction connecting between J (12b), and these S and N poles 1a1 are the farthest (12aJ) from the above (12b), respectively.
They are in a separated state. Therefore, magnet 141
Both Q of the yoke part az due to the sleep pole of the S pole and the N pole of
m (12aJ (12bJ) has the weakest magnetizing force. Next, when the power switch of the tape recorder is turned on and electromagnetic power is supplied, the motor drives the drive gear (6) as shown in Figure 1.
) is rotated in the direction of arrow d. Next, when the FWD button of the tape recorder is pressed in this situation, a predetermined current is applied to the coil a9 as shown in FIG.
The magnetic poles of N pole and 8 pole appear. At this time, first, as described above, the magnetic ridge #! is formed by the second yoke portion 0 compared to the magnetic ridge #IR] formed by the first yoke portion Q21. Due to the high magnetic resistance of the second magnetic path, almost no magnetic flux flow occurs in the second magnetic path, and as shown in FIG. 3 (the magnetic flux φ1 mainly flows in the first magnetic path, First access part aacv* (12Jl)
tlzb) K N 'fjs t8 pole f) a pole power fA is received. Next, at this time, in the state 111 of FIG.
If the magnetizing force of both ends (12a) (12bJ) of the edge part (12+) is strong, and both lea (12a) (12b) are strongly magnetized to the S' pole and the d pole, then due to the above magnetic flux - irises, Both ends (12aJ (12bJ) of the magnetized S'
The pole and r1/pole must be reversed to N and S poles, respectively, and for this purpose, a large current is passed through coil α9 in order to increase the magnetic flux density of the magnetic flux φ1 to enable the reversal. There is a need. However, as mentioned above-
Since the magnetizing force at both ends (12a) (12b) of the first affected part ag due to the magnetic poles of the S and N poles of the magnet (4) is very weak, By just passing a very small amount of current, the magnetic poles (total and 8 poles) will surely appear at both ends (12a) and (12b) of the first yoke part σ2.Therefore, the current flowing through the coil (151) The power saving effect is always large.Next, both ends (12a) (12b) of the yoke part αt of W,
) When the GCN pole and the 8-pole magnetic pole appear, attraction and repulsion are generated between the magnetic pole and the magnetic pole of the S and N poles of the magnet (41), causing the partially toothed gear 111 to rotate in the direction of arrow e. A force, that is, a mechanical trigger is generated, and the partially toothed gear 111
is immediately engaged with drive gear +61K. This rear partially toothed gear (11) continues to be rotationally driven in the direction of arrow C by the driving gear (6), and as shown in FIG. At this time, as the toothless gear +11 rotates in the direction of the arrow e, the cam (5) is rotated in the same direction as shown in Figure 2, and the cam +51 vc The switching lever @ is swung in the direction of the arrow f, and the head base IIi circle is moved in the direction of the arrow a against the spring ■' to move from the non-operating position to the second position shown in FIG.
It is moved forward to the operating position shown in the figure. Note that as the head substrate αa is moved back to the operating position, the scratches of the magnetic head a are brought into contact with the tape, the pinch roller is pressed against the capstan (none of which is shown), and the mode is switched to FWD mode. With the forward movement of the head base 8118), the lock lever (C) is rotated in the direction of arrow C by the spring @, and the movable iron core C33 moves from the non-holding position shown in Fig.
It is moved forward to the holding position shown in Figure 2. When the head board u8 is moved forward to the forward position, the driving iron guide is brought into close contact between the second yoke part (13's both ends jua) (13b) as shown in FIG. When the movable iron core C121 is brought into close contact between both ends (1Ba) (13bJ) of the second yoke part CI'3, as shown in FIG. The magnetic path is switched to a closed magnetic path with lower magnetic resistance than the first magnetic path by the yoke part a'aVc.As a result, the flow of magnetic flux is switched from the magnetic path of ]° to the second magnetic path, which is the same as before. Almost no magnetic flux φ! flows in the first magnetic path (as shown in Fig. 4), and the magnetic flux φ flows mainly in the second magnetic path, causing magnetic As a result, the rotation force of the partially toothed gear (1) due to the magnetic flux -IK is almost eliminated, and the partially toothed gear (lν is the S of the magnet (4) in the non-meshing state shown in Fig. 1). The movable iron core opening is attracted to the second yoke part a4 and is held at its holding position. At this time, since the second magnetic path has already been formed as a closed magnetic path, even if the current flowing through the coil α9 is extremely small, the movable iron core opening is connected to the yoke part (131) of the leg 2.
The movable iron core 621 is moved to the second yoke part by the attractive force of the magnetic flux φ flowing in the second magnetic path. If you try to attach it to A3 by suction, you will need strong suction power.
In order to increase the magnetic flux density of the magnetic flux 6, it is necessary to send a large current to the coil a9, but the movable iron core t34 is mechanically moved forward by a lock lever (to) that is linked to the forward movement of the head board ua. Both ends of the second yaw 5a31 (13
a) (13bJ Since the VC is in close contact with the structure, the above-mentioned attraction force due to the magnetic flux -! is completely unnecessary, and the coil +
151 is a pole (a small amount of current can be passed through the coil [151]. First, a large current is passed through the coil [151, and the magnetic flux d) attracts the movable iron core 6z to the east of the second yoke part a and brings it into close contact. Next, it is possible to reduce the current flowing through the coil (+51), but in that case, circuit switching (switching operation) is required, and the structure is extremely VC ([This mode switching mechanism is complicated, but There is no need to do so. By magnetically locking the movable iron core 621 at the holding position, the head substrate a81 is locked at the operating position via the lock lever. This completes a series of operations for switching to FWD mode, but when the 5TOP button is pressed, coil 051
At the same time, the head substrate (181) is moved back to the non-operating position by the spring holder, and at the same time, the head substrate 181 is supplied with electricity to the second yoke portion a3 via the regulating portion ω and the bottle holder. The lever circle is also moved back to the non-holding position against the spring @. By the way, according to the mode switching mechanism described above, since the head base WaS is electrically locked in the operating position, the power supply is turned off. The lock can be immediately released by cutting the .Therefore, it is very easy to reset when recording while you are away, making it ideal for recording while you are away.Next, Figure 5 shows a modification As an example, 5vc is bent in a Y-shape so that both ends (12a) and (12b) of the first yoke su side face the rotation center of the magnet (41), and these both ends ( 12a) Only one of (12b) [For example, (12a))
Placed close to +41':! -It is a set thing. In this case, when the toothless gear tl+ is in a non-meshing state facing the drive gear (6) by the notch (2), the magnet +41, for example,
It is stabilized by being attracted to the yoke part (for example, -10,000 mt1za of 121), and the stabilizing iron core αe becomes unnecessary. Note that all other operations are the same as those in FIG. By interlocking with the controlled member of the customer type switching mechanism, it can be applied to various mode switching mechanisms such as FF, REW, REC, AMS, U perspective, pause, etc. Also, this mode switching mechanism and switching type electric skewer plunger Ql can be applied to devices other than recording and reproducing devices.As described above, the present invention includes a first yoke portion forming a first magnetic path, and a magnetic resistance 1I having a higher magnetic resistance than that of the first magnetic path.
a second yoke part forming a magnetic path c2, an excitation coil is wound around the common part of these first and second yoke parts, and a movable iron core provided movably is connected to the second yoke part. This switching type electromagnetic plunger is constructed so that the second magnetic path becomes a closed magnetic path with lower magnetic resistance than the first magnetic path by bringing the yoke sVc into contact with the yoke sVc of the switching type electromagnetic plunger. The flow of magnetic flux in the first magnetic path and the second magnetic path is automatically controlled by passing a predetermined current through the excitation coils of the three single VCs without performing any switching operation of the current-carrying circuit. It is possible to exhibit the switching effect of switching to . Therefore, for example, when used in the S mode switching mechanism shown in the embodiment, the automatic switching of the magnetic flux flow automatically switches between the mechanical trigger operation and the - lock operation at the operating position of the control member. Things that can be done and are very convenient are used.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a mode switching mechanism of a tape recorder, and FIG. 1 is a plan view of a 5TOP monido, W, and 2 are plan views illustrating the switching operation to FWD mode. , FIG. 3 and FIG. 4 are half views for explaining the switching effect of the electromagnetic plunger, and FIG. 1g5 is a plan view showing a modified example of the yoke. Also, the symbol Vci3 used in the drawing is aα...
・・・・・・Electromagnetic plunger αυ・・・・・・・・・
Yoke (121......First yoke part 01...
......Second yoke part Q41...
・・・Common part a9・・・・・・Excitation coil capacitor・・・・・・
...It is a movable iron core. Agent Katsu Ueya Figure 1 Figure 2

Claims (1)

[Claims] #! ] and a second yoke portion forming a second magnetic path having higher magnetic resistance than the first magnetic path, and An excitation coil is wound around a common part of the second yoke part, and a movable iron core provided movably is brought into contact with the second yoke part, thereby creating the second magnetic path. A switching type electromagnetic plunger configured to form a closed magnetic path with lower magnetic resistance than the magnetic path.