JPS6158902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a movable plate equipped with a capstan shaft, a reel shaft, and a drive mechanism for rotationally driving these.
The present invention relates to an operating state holding device for a tape recorder which is held at a predetermined operating position using a small electromagnet.

A capstan shaft, a reel shaft, and a drive mechanism for rotationally driving these are mounted on a movable plate, and the movable plate is brought close to a cassette loading section provided on the recorder board, and the capstan shaft and reel shaft are connected to the tape inside the cassette loading section. Tape recorders that are inserted into a cassette are well known in the art.This type of tape recorder has a movable plate that is held in a predetermined operating position, that is, in a position close to the cassette loading section, and the tape recorder is played back. , an operating state holding device is provided for maintaining the operating state such as recording. This generally includes a locking member that can be freely engaged and detached from the movable plate, and when the movable plate moves to a predetermined operating position, an excitation operation is performed in conjunction with this, and the locking member is brought into the locking position with respect to the movable plate. In conventional operating state maintaining devices of this type, the locking member is always held by a spring in a position where it does not engage with the movable plate. The locking member was configured to be held at a position where it engages with the movable plate by attracting it with an electromagnet. Therefore, the electromagnet in the conventional device must be strong enough to reliably and quickly attract the locking member located at a distant position against the spring, and such an electromagnet is large. Since then, the tape recorder itself has become large and expensive.

The present invention has been made based on the above circumstances, and provides a tape recorder in which a capstan shaft, a reel shaft, and a movable plate equipped with a drive mechanism for rotationally driving these are held at a predetermined operating position by an electromagnet. An object of the present invention is to reduce the size of the electromagnet and ensure reliable operation in the operating state holding device.

That is, the present invention has a cassette loading section, a capstan shaft, and a reel shaft mounted thereon, which is disposed below the cassette loading section, moves forward and moves in the cassette direction in response to the operation of loading a cassette into the cassette loading section. a movable plate for inserting the capstan shaft and reel shaft into the cassette; and a first movable plate for always urging the movable plate in the backward direction.
The target is a tape recorder equipped with a spring, in which a locked part provided on the movable plate, and a locking part provided on the movable plate and a locking part provided rotatably on one end side from a position where the movable plate is advanced by a certain amount or more. an inclined surface that slides in contact with the locked part and receives a rotational force in a direction perpendicular to the moving direction of the locked part; and a slope that engages with the locked part at a position where the locked part passes over the inclined surface. a locking member having a hook made of a locking surface that can be mated with each other, and arranged such that the direction of a line connecting the hook and a pivot point intersects the direction of movement of the movable plate;
An adsorption force is applied between the locking member and the other end of the locking member to provide the locking member with a rotational force in the direction of maintaining the engagement relationship between the locking surface of the hook and the locked portion. an electromagnet, a switch that energizes the electromagnet when the movable plate advances to a position where the locked portion crosses the inclined surface of the hook, and a switch that applies a force to the locking member in a direction to attract the electromagnet. The above object is achieved by providing a second spring that is weaker than the first spring that is always applied.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operating state maintaining device of the present invention will be explained below based on embodiments shown in the drawings. Fig. 1 is a plan view of the tape recorder mechanism section showing the state before the tape cassette is inserted, and Fig. 2 is a plan view of the same section showing the state after the tape cassette is inserted. A cassette loading section is provided on the top side of the board 1, a movable plate 3 is placed on the bottom side of the board 1, and a head mounting plate 4 is placed on the top side of the board 1.

As shown in FIG. 3, the cassette loading section 2 includes an L-shaped plate 5 with one piece screwed to the right side of the board 1, a support protrusion 7 that supports the tape cassette 6 from below,
8, and a leaf spring 9 that holds down the cassette 6 from above.
It is comprised of a positioning section 10 for positioning the cassette 6 in the left-right direction, and is configured to allow the cassette 6 to be inserted horizontally in the longitudinal direction with its head inlet facing leftward. A capstan shaft 1 is mounted on the upper surface of the movable plate 3 as shown in FIGS. 1 and 2.
1. A drive mechanism including reel shafts 12a, 12b and a motor 13 for rotationally driving them is installed. Further, a magnetic head 14, a pinch roller 15, etc. are attached to the upper surface of the head mounting plate 4.

As shown in FIG. 4, the movable plate 3 has its left and right sides connected to the left and right inner surfaces of the board 1 by two links 16a and 16b, respectively, and these links 16a maintain a state substantially parallel to the board 1. , 16b, and moves upward while moving forward. Further, a pressing pin 17 and a head support pin 18 are protruded from the upper surface of the movable plate 3, and these pins 17 and 18 are connected to an opening 19 and a long hole 2 provided in the recorder board 1, respectively.
0 and protrudes to the upper surface side of the substrate 1. Then, the movable plate 3 is connected to the movable plate 4 as shown in FIG.
and the return spring 21 suspended between the board 1 and the board 1.
is constantly biased downward.

The head support pin 18 is inserted into one end of the head mounting portion 4, and is adapted to move one end of the head mounting plate 4 straight in the insertion/removal direction of the cassette 6 as the movable plate 3 moves in an arc. Further, in FIG. 1 or 2, reference numeral 22 is a link member, and one end of this link member 22 is rotatably supported on a support shaft 23 erected on the upper surface of the board 1. It has an elongated hole 24 that is long in the rotation radial direction. One of the two shafts 25a and 25b that attach the magnetic head 14 to the head mounting plate 4 is inserted into the elongated hole 24, and a deployment spring 25a is inserted between it and the shaft 25a of the support shaft 23. By passing the
The shaft 25a is always elastically held at the tip of the elongated hole 24. Therefore, the head mounting plate 4 is moved by the support pins 18 as the movable plate 3 moves in an arc.
It performs a horizontal arc movement restrained by the link member 22 about the center. Further, a shaft 27 is provided upright on the upper surface of the head mounting plate 4, and a pinch arm 28 supporting the pinch roller 15 is rotatably supported on the shaft 27. And this pinch arm 2
8 is always biased counterclockwise by a deployment spring 29 wound around the shaft 27, and its rotating end is locked to a stopper shaft 30 on the head mounting plate 4, as shown in FIG.

A fast-forward operation lever 31 is pivotally supported at the front end of the upper surface of the recorder board 1 (on the operator's hand side) via a shaft 32 so as to be freely rotatable in the horizontal direction. This lever 31 has a bent piece 33 and a guide pin 34 at one end, and the guide pin 34 is inserted into an arcuate hole 35 provided in the base plate 1. The circular arc hole 35 is the shaft 3
2 as the center of curvature, and the bent piece 33 is always positioned to the right of the head mounting plate 4.
The lever 31 is always biased clockwise by a spring 36 suspended between the bending piece 33 and the base plate 11.

A locking member 37 is provided on the upper surface of the recorder board 1.
is rotatably supported by a shaft 38. This locking member 37 has a U-shaped pivot portion as shown in FIG. Make it thinner and attach a hook 39 on one side of the bottom.
At the same time, a suction piece 40 is swingably attached to the upper end surface via a shaft 40a, and rotation of this suction piece 40 is prohibited by a bent piece 40b. By the way, the hook 39 extends to the lower surface side of the board 1 through the opening 19 of the recorder board 1, and when the movable plate 3 is in the lowered position, it is located in front of the pressing pin 17 as shown in FIG. When the is in the raised position, press pin 17 is pressed as shown in Fig. 2.
It is becoming more and more engaged. Further, the attraction piece 40 is adapted to attract an electromagnet 41 attached to the left side surface of the substrate 1 to maintain the state of engagement with the pressing pin 17 of the hook 39.

As shown in FIG. 6, the electromagnet 41 consists of a yoke 42 and a coil 43 wound around the yoke. It is attached as shown in Figure 7. The above leaf spring 44
The tip 44a is attached to the yoke 4 as shown in FIG.
It is installed slightly protruding from the suction surface of 2.

On the other hand, the locking member 37 is biased by a tension spring 46 suspended between the member 37 and the substrate 1 in a direction in which the adsorption piece 40 contacts the yoke 42 of the electromagnet 41. When the yoke 44 is not energized, the leaf spring 44 prohibits the adsorption piece 40 from coming into contact with the yoke 42 .

Further, a normally open switch 47 is attached to the upper surface of the recorder board 1 to control the energization of the electromagnetic coil 43. When the head mounting plate 4 moves forward together with the movable plate 3, the switch 47 is pushed by the bent piece 4a formed at the front end of the mounting plate 4 and closes as shown in FIG. 2, thereby exciting the electromagnet 41. make it work.

Next, the operation in this embodiment will be explained. First, before the cassette 6 is inserted, as shown in FIG. is maintained. Further, the head mounting plate 4 is restrained by the head support pin 18 and positioned on the operation side, and is restrained by the link member 22 so that the support pin 1
It is located at a position rotated to the left around 8. The magnetic head 14 and the pinch roller 15 are held at a position away from the cassette insertion path to the left.

When the cassette 6 is inserted into the cassette loading section 2, the pressing pin 17 is pushed by the cassette 9, and the movable plate 3 moves in an arc restrained by the links 16a and 16b due to the pushing force of the cassette 6.
It rises while moving in the cassette insertion direction. During this cassette insertion operation, the pressing pin 17 is inserted into the locking member 3.
7 and rotates the same member 37 clockwise against the spring 46, that is, in a direction to pull the attraction piece 40 away from the electromagnet 41, but when the cassette 6 reaches a predetermined loading position, it is pressed. The pin 17 is removed from the side edge, and the locking member 37 is attached to the spring 4.
6 and returns counterclockwise, and the hook 39 engages with the pressing pin 17. Note that, at this time, the adsorption piece 40 is held at a position close to the electromagnetic yoke 42. In addition, as the movable plate 3 moves upward, the capstan shaft 11 and the reel shafts 12a, 1
2b is inserted into the cassette 6 from below. On the other hand, during the cassette insertion operation, the head mounting plate 4 is moved in the cassette insertion direction as the movable plate 3 moves forward, and the support pin 1 is restrained by the link member 22.
It rotates to the right around 8. Then, the magnetic head 14 and the pinch roller 1 on the head mounting plate 4
5 is inserted into the cassette 6 during the insertion operation of the cassette 6, and when the cassette 6 reaches a predetermined loading position, it contacts the magnetic head inside the cassette 6 and presses the tape with the capstan shaft 11 and the pinch roller 15. It comes to be held in place. In addition, pinch roller 1
5 is applied to the capstan shaft 11 by a deployment spring 29. Furthermore, since the head mounting plate 4 closes the spring 47 with its bent piece 4a during forward movement, when the cassette 6 reaches a predetermined loading position, the electromagnet 41 is energized and attracts the attraction piece 40. The locking member 37 is held at a position where its hook 39 is engaged with the pressing pin 17 as shown in FIG. 2, and the return operation of the movable plate 3 is prohibited.

Therefore, if the configuration is such that the motor 13 is energized when the movable plate 3 moves to the position shown in FIG.
is started, the capstan shaft 11 and the reel shaft 12a on the take-up side rotate, and the magnetic tape in the cassette 6 runs at a constant speed due to the rotation of the capstan shaft 11, thereby performing a reproducing operation.

Furthermore, when the fast-forward operation lever 31 is rotated counterclockwise in the state shown in FIG.
Press from the right side. As a result, the mounting plate 4 rotates to the left about the support pin 18 against the deployment spring 26, and the magnetic head 14 and the pinch roller 15 are separated from the magnetic tape in the cassette 6.
Therefore, the magnetic head is no longer restrained by the capstan shaft 11, and can be wound at high speed by the rotation of the reel shaft 12a. When the fast-forward operating lever 31 is released from the bias, the lever 31 is returned to its original position by the spring 36 and returns to the reproducing operation state shown in FIG. 2.

Next, when the reproducing operation is stopped and the cassette 6 is taken out from the loading section 2, the electromagnetic coil 43
All you have to do is stop energizing it. As a means of doing so,
For example, it is conceivable to manually open another switch connected in series with switch 47. That is, if the energization to the electromagnetic coil 43 is stopped,
The locking member 37 rotates clockwise (in the direction in which the adsorption piece 40 moves away from the electromagnetic yoke 42) by the return force of the movable plate 3, the press pin 17 comes off from the hook 39, and the movable plate 3 moves back and returns while descending. . And the capstan shaft 11 and the reel shafts 12a, 12
b escapes downward from the cassette 6, and the magnetic head 14 and pinch roller 15 escape from the cassette 6 to the left due to the leftward movement of the head mounting plate 4. In this state, the cassette 6 in the cassette loading section 2
is pushed back by the pressing pin 17. Further, when the pressing pin 17 is removed from the hook 39, the locking member 37 is rotated again by the spring 46, and the suction piece 4
0 is close to the electromagnet yoke 42 as shown in FIG.

According to the operating state holding device configured as described above, the locking member 37 that holds the movable plate 3 in the operating position
is always biased in the direction approaching the electromagnet 41, so even if the electromagnet 41 is small, when the movable plate 3 moves to a predetermined operating position, it instantly attracts the locking member 37 and the movable The plate 3 can be reliably held in the operating position. In other words, the locking member 3
7 is located close to the electromagnet 41, so the same member 3
7 can be attracted and held by extremely small magnetic force. Further, when the electromagnet 41 is not energized, the adsorption piece 40 of the locking member 37 is slightly separated from the electromagnet yoke 42 by the leaf spring 44, so there is no risk of malfunction due to residual magnetism.

Note that the present invention is not necessarily limited to the configuration of the embodiments, and can be modified in various ways. For example, if the electromagnet is made small and the magnetic force is made sufficiently small, the residual magnetism will be reduced, and the leaf spring 44 can be omitted. In this case, the attracting piece 40 of the locking member 37 is in contact with the electromagnet yoke 42 even when the electromagnet 41 is not energized, so that the electromagnet can be further miniaturized.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and FIGS.
The figure is a plan view showing the mechanical part of the cassette type tape recorder, Figure 3 is a cross-sectional view showing the cassette loading section of the same tape recorder, and Figure 4 is a longitudinal cross-sectional view showing the relationship between the recorder board and the movable plate of the same tape recorder. side view,
Fig. 5 is a perspective view showing the locking member of the operating state holding device installed in the tape recorder, Fig. 6 is an exploded perspective view showing the electromagnet of the holding device, and Fig. 7 shows the installed state of the electromagnet. A side view (view from the arrow in FIG. 1) and FIG. 8 are plan views showing the relationship among the locking member, electromagnet, and switch of the holding device. 1...Recorder board, 2...Cassette loading section,
3...Movable plate, 6...Cassette, 11...Capstan shaft, 12a, 12b...Reel shaft, 21...
...Return spring, 37...Locking member, 41...
electromagnet.

Claims (1)

[Claims] 1 A cassette loading section, a capstan shaft, and a reel shaft are attached, and the reel is disposed below the cassette loading section, and moves forward in response to the loading operation of the cassette into the cassette loading section, and moves in the cassette direction to connect the capstan shaft to the cassette loading section. and a movable plate that inserts the reel shaft into the cassette, a first spring that always biases the movable plate in the backward direction, and a locked portion provided on the movable plate, which is rotatably provided. An inclined surface on one end side that slides into contact with the locked part from a position where the movable plate has advanced beyond a certain level and receives a rotational force in a direction perpendicular to the moving direction of the locked part, and the locked part is tilted. The hook has a locking surface that can engage with the locked portion at a position beyond the surface, and the direction of a line connecting the hook and the rotational fulcrum intersects the direction of movement of the rotational plate. A direction in which an adsorption force is applied between a locking member arranged in relation to the other end of the locking member to maintain an engagement relationship between the locking surface of the hook and the locked portion. an electromagnet that applies rotational force to the locking member; a switch that energizes the electromagnet when the movable plate advances to a position where the locked portion crosses the slope of the hook; An operating state maintaining device for a tape recorder, comprising: a second spring that is weaker than the first spring and always applies a force in the direction of attracting the electromagnet.