JPS6314413B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission device in a cam mechanism.

For example, some magnetic tape devices use a cam that is driven in accordance with the rotation of a motor to perform various switching operations such as auto-reverse operation, head crimping/release operation, and cassette attachment/detachment operation. Conventional devices of this type directly connect an actuating member that performs various switching operations and a cam that operates this actuating member, so that the drive of the cam is directly transmitted to the actuating member (i.e., the cam's driven member). I was doing it.

However, such conventional devices have the following drawbacks when the power is cut off and the motor stops while the cam is in the process of switching the actuating member, or when another operation is attempted. For example, if the power is cut off and the motor stops while the cam is in the middle of crimping the head or loading the cassette, the head or cassette may stop in an unstable position during switching, making it impossible to remove the cassette. It was hot. Also, during the crimping operation of the head by the cam, stop operation, rapid forwarding,
If you attempt to perform an operation that involves releasing the head, such as rewinding or ejecting, or if you attempt to eject during the cassette loading operation using the cam, the head crimping operation or cassette loading operation will be completed. It is not possible to move on to the next operation until the end of the operation, and therefore one has to wait for those operations, and if the operation is forced, the head etc. may be damaged.

It is an object of the present invention to eliminate the drawbacks of the above-mentioned conventional devices and to provide a transmission device for a cam mechanism in which the transmission between a cam and its driven member can be released even during the operation of the driven member. .

The present invention will be described with reference to embodiments shown in the drawings.

1 to 6 show an embodiment applied to the crimping operation of the head, and in the following description, terms such as up, down, left, and right refer to directions in the figures. 1 and 1' are capstans installed on a fixed frame (not shown);
2 is a gear provided coaxially with the capstan 1' and rotates in conjunction with the rotation of a motor (not shown); 3 is an intermittent gear that is attached to a fixed frame and whose portion other than the notch 4 meshes with the gear 2; 5 is an intermittent gear; The cam is integrally provided with the gear 3, and a stepped portion 6 is formed at an interrupted portion thereof. Reference numeral 7 denotes a switching member which is attached to the switching member 7 so as to be movable from side to side, with long grooves 9 and 9' fitting into guide pins 8 and 8' provided on the fixed frame. Reference numeral 10 is provided on the switching member 7 and engages with the cam 5. The roller (or pin) 11 is a spring that biases the switching member 7 leftward, and the tensile force of this spring 11 causes the roller 10 to come into contact with the cam 5. As shown in FIG. 1, when the intermittent gear 3 is in a position where it does not mesh with the gear 2, the roller 10 is in contact with the step 6 of the cam 5, and due to the force of the roller 10 moving leftward, The intermittent gear 3 is urged to rotate counterclockwise toward a position where it meshes with the gear 2. The intermittent gear 3 resists this urging force.
A stopper member 12 is used to stop the motor at the position shown in FIG. The stopper member 12 is pivotally supported by a guide pin 8', and when the release plunger 13 provided on the fixed frame is not energized, the stopper member 12 is in the position shown in FIG. The intermittent gear 3 is stopped by being locked.

16 is a guide pin 17 provided on the fixed frame,
The stroke limiting groove 18 and the long grooves 18', 18'' fit into the stroke limiting grooves 17' and 17'', respectively, and the actuating member is mounted to be movable up and down by the stroke limited by the stroke limiting groove 18, and 19 is the actuating member 16 The heads 20, 20' provided on the holder are springs that urge the actuating member 16 upward, and the lower end of the stroke limiting groove 18 is brought into contact with the guide pin 17 due to the tensile force of the springs 20, 20'. At this time, the head 19 is in the release position. 21 is a slightly elongated slot formed in the operating member 16; 22 is a control member whose fulcrum 23 is fitted into the slot 21 so as to be movable up and down; and an inclined surface 24 on the upper right side. A lower inclined surface 25 and an upper inclined surface 26 are formed on the upper left side. 27 connects the fulcrum 23 of the control member 22 to the actuating member 1
6, the tensile force of this spring 27 is greater than the tensile force of the springs 20, 20', so that the control member 22
Not only when it is in the upper position as shown in the figure, but also when it is pushed downward as shown in Figure 3, the upper end of the stroke limiting groove 18 comes into contact with the guide pin 17, and the actuating member 16 cannot move further downward. The fulcrum 23 is kept in contact with the upper end of the slot 21 until it runs out.

28 is a sector member whose fulcrum 29 is pivotally supported by a fixed frame, and as the fitting part 30 fitted into the left end groove of the switching member 7 moves left and right due to the movement of the switching member 7, A protrusion 31 that engages with the inclined surface 24 of the control member 22 is adapted to move up and down. Reference numeral 32 is a locking member whose fulcrum 33 is pivotally supported by a fixed frame, and is provided with a protrusion 34 that engages with the inclined surfaces 25 and 26 of the control member 22, and a fitting portion 35 is provided at the upper end. 36 is a holding member attached to the fixed frame so as to be movable left and right; 37 is a concave groove provided at the left end of the holding member 36 into which the fitting portion 35 of the locking member 32 is fitted; 38;
39 is a spring that urges the fitting part 35 toward the right end bottom of the groove 37 toward the right against the holding member 36, and 39 is provided at the right end of the holding member 36 and cooperates with a holding plunger 40 provided on the fixed frame. movable core,
A spring 41 biases the holding member 36 rightward so as to draw the movable core 39 into the holding plunger 40. The tensile force of the spring 38 is stronger than the tensile force of the spring 41, so that the movable core 39 is attracted to the holding plunger 40 as shown in FIG. 26 to prevent upward movement of the control member 22, the tension of the spring 38 maintains this locked state, and when the holding plunger 40 is de-energized as shown in FIG. The locking member 32 is rotated counterclockwise against the tension of the spring 41 to release the locked state.

42 is provided on the fixed frame, and the control member 22
A stopper 43 is provided on the fixed frame to limit the rotation range of the sector member 28 in the clockwise direction. In order to prevent the upper inclined surface 26 from becoming difficult to detach from the protrusion 34 of the locking member 32 due to rotation counterclockwise following the locking member 32 even after the upper inclined surface 26 is removed from the protrusion 31, the control member is This is a regulating piece that regulates the counterclockwise rotation range of 22.

The apparatus of the above embodiment operates as follows.

First, when the device is not in operation, it is in the state shown in FIG. For example, when a cassette is inserted from this state, the release plunger 13 is energized and the stopper member 12 is rotated counterclockwise and removed from the protrusion 15. Then, the roller 10 pushes the stepped portion 6 due to the tensile force of the spring 11, and moves the cam 5 to the left while rotating it counterclockwise. As the cam 5 rotates, the intermittent gear 3, which is integral with the cam 5, rotates in the same direction and meshes with the gear 2, which is rotated clockwise by the motor. On the other hand, due to the leftward movement of the switching member 7 in conjunction with the leftward movement of the roller 10, the protrusion 31 of the sector member 28 moves upward and moves from the right side of the control member 22 to the inclined surface 24.
As a result, the control member 22 can be rotated clockwise, and the control member 22, locking member 32, and retaining member 36 are moved clockwise and to the right by the tension of the spring 41, and the movable core 39 is called in and the holding plunger 4 is energized.
0 (see Figure 2).

The intermittent gear 3 meshing with the gear 2 continues to rotate in the same direction, so that the cam 5 pushes the roller 10 and moves the switching member 7 to the right, and as a result, the protrusion 31 of the sector member 28 moves downward. and push the inclined surface 24 of the control member 22 downward. Control member 2
2 is pushed downward, the actuating member 16 is pushed downward integrally with the control member 22 until the upper end of the stroke limiting groove 18 abuts the guide pin 17, while the locking member 32 is moved so that the protrusion 34 of the control member 22 It is pushed by the lower inclined surface 25 and rotates counterclockwise against the tensile force of the spring 38 (see FIG. 3).

When the actuating member 16 is in the lower end position (i.e. the head 19
Even after the roller 10 reaches the crimping position of the cam 5
The control member 22 continues to be pushed downward until it reaches its highest point, at which time the fulcrum 23 moves downward in the slot 21 against the tension of the spring 27, while the locking member 32 is moved so that the projection 34 is inclined downwardly. It comes off above the surface 25 and rotates clockwise under the tension of the spring 38 (see FIG. 4).

When the roller 10 exceeds the highest point of the cam 5, the notch 4 of the intermittent gear 3 comes to a position facing the gear 2 and the mesh is disengaged, and the energization of the front latch release plunger 13 is cut off and the spring 14 is turned off. The stopper member 12, which has returned to the stop position due to the tensile force, engages the projection 15, so that the intermittent gear 3 is stopped in this position. On the other hand, the switching member 7 is moved to the left by the tensile force of the spring 11 until the roller 10 comes into contact with the stepped portion 6, and along with this, the projection 31 of the sector member 28 is moved upward. The control member 22 from which the downward pressing force by the protrusion 31 has been released moves toward the upper inclined surface 2
6 moves upward under the tension of the spring 27 until it abuts against the protrusion 34 of the locking member 32. The locked state in which the upper inclined surface 26 is in contact with the protrusion 34 is maintained by the holding force of the holding plunger 40 and the tensile force of the spring 38. In this locked state, the protrusion 23 of the control member 22 is positioned with a slight gap from the upper end of the slot 21, so that the tensile force of the spring 27 effectively acts on the actuating member 16, and the actuating member 16 is at the lower end position ( That is, the head 19 is securely held in the crimped position (see FIG. 5). This locked state is maintained during the cassette tape play operation.

The process from Figure 2 to Figure 5 above and Figure 5
In the locked state shown in the figure, if an operation involving release of the head is to be performed, the holding plunger 40 may be de-energized. Then, the holding member 3
6 and the locking member 32 lose their holding force by the retaining plunger 40 and the springs 20, 2 thereby bias the control member 22 upwardly via the actuating member 16.
A tension of 0' overcomes the tension of spring 41 which urges control member 22 clockwise through retaining member 36 and locking member 32. Therefore, the control member 2
2, the projection 31 is rotated counterclockwise so that the inclined surface 24 escapes the projection 31 of the sector member 28.
The lock member 32 is removed from the lock member 32 so that the upper inclined surface 26 pushes the protrusion 34 of the lock member 32 to the left.
is removed from the protrusion 34 while being rotated counterclockwise, and then moved upward to a position where the lower end of the stroke limiting groove 18 abuts the guide pin 17 (that is, the release position of the head 19) and then stopped. When the holding plunger 40 is de-energized in the process shown in FIG. 3, the state shown in FIG. 6 is reached. If the motor continues to rotate, the intermittent gear 3
continues to rotate from the position shown in FIG. 6 and then stops at the position shown in FIG. 1.

Furthermore, even if the power is cut off in the process from FIG. 2 to FIG. 5 or in the locked state shown in FIG. I will do it.

7 to 9 show an embodiment applied to the cassette mounting operation and the head crimping operation. Reference numeral 51 denotes a rotating member rotatably mounted around a support shaft 52 provided horizontally on a fixed frame (not shown); 53 is hinged at the tip of the rotating member 51;
A cassette guide 54, which moves up and down in a horizontal state with the rotation of the cassette guide 54, is mounted on a fixed frame so as to be movable in the front-back direction as shown in FIG. The head plate includes a head 55 and a pinch roller 5.
6 and a protrusion 57 are attached. Reference numeral 58 denotes an operating member provided on the fixed frame so as to be movable in the left-right direction in FIG. A guide groove 62 that fits into a projection 61 provided on the rotating member 51 is formed. Reference numeral 63 denotes a control member whose base end is pivotally connected to the actuating member 58, and is connected to the inclined surfaces 24, 2 of the embodiment described above.
Slanted surfaces 64, 65, 66 similar to 5, 26 are formed. 67 is the sector member 28 of the above embodiment.
It is a swinging member similar to the one shown in FIG.
is designed to move to the right. Numeral 69 is a projection similar to the projection 34 of the locking member 32 of the embodiment described above, and when the control member 63 is pushed to the right while a holding plunger (not shown) similar to the holding plunger 40 of the embodiment described above is energized, an inclined surface is formed. 66 to lock the actuating member 58 at the right end position, and to release the lock when the holding plunger is de-energized. An actuator 70 is pressed to turn on a switch 71 when the cassette is inserted, and also pushes out the cassette when the cassette is ejected.

In the device of this embodiment, when the cassette is inserted into the cassette guide 53 and the actuating member 58 is pushed to the right, the protrusion 61 is guided downward along the guide groove 62, so that the rotating member 51 moves to the eighth position. By rotating clockwise in the figure, the cassette guide 53 is lowered and the cassette is installed in a predetermined playing position, while the protrusion 57 is guided along the guide groove 60, thereby causing the head plate 54 to move forward in FIG. The head 55 and the pinch roller 56 are moved to press against the tape. If you want to release the cassette mounting operation and the head crimping operation, you can turn off the power to the holding plunger and the actuating member 5
8 will immediately move to the left and release it.

In addition, in the embodiment shown in FIGS. 1 to 6, the control member 2
2 is pivoted to be movable up and down with respect to the operating member 16, but it is also possible to simply pivot the holding plunger 40.
is used not only for holding during the process from FIG. 2 to FIG. 5 but also for holding in the locked state of FIG. 5, but they may be provided separately. Furthermore, although the above embodiments are applied to a magnetic tape device, the present invention is not limited thereto, and it goes without saying that various changes and modifications of the above embodiments can be made.

Since the present invention is configured as described above, the transmission between the cam and its driven member can be canceled even during the operation of the driven member, so that, for example, in a magnetic tape device, auto-reverse operation, head crimping, release operation, etc. It is applied to an actuating member that performs various switching operations such as attaching and detaching a cassette, and a cam that operates this actuating member, so that the power is cut off and the motor stops while the cam is performing the switching operation of the actuating member. This has excellent effects such as being able to bring the actuating member into a stable state by cutting off the electricity to the electromagnetic plunger when attempting to perform other operations.

[Brief explanation of the drawing]

1 to 6 are plan views showing different states of one embodiment of the present invention, and FIG. 7 is a partially cutaway plan view showing another embodiment of the present invention, excluding the cam. Figure 8 is a front view of the one in Figure 7;
FIG. 9 is a partially cutaway longitudinal sectional front view taken along the line - in FIG. 7. 1, 1': Capstan, 2: Gear, 3: Intermittent gear, 4: Notch, 5: Cam, 6: Step, 7: Switching member, 8, 8', 17, 17'17'': Guide pin, 9, 9', 18', 18'': long groove, 10: roller, 11, 14, 20, 20', 27, 38, 4
1, 59: Spring, 12: Stopper member, 13: Release plunger, 15, 31, 34, 57, 61,
68, 69: projection, 16, 58: operating member, 1
8: Stroke limiting groove, 19, 55: Head, 2
1: Slot hole, 22, 63: Control member, 23, 29,
33: Fulcrum, 24, 25, 26, 64, 65, 6
6: Inclined surface, 28: Sector member, 30, 35: Fitting portion, 32: Lock member, 36: Holding member, 3
7: Concave groove, 39: Movable core, 40: Holding plunger, 42: Stopper, 43: Regulating piece, 51: Rotating member, 52: Support shaft, 53: Cassette guide, 5
4: Head plate, 56: Pinch roller, 60,6
2: Guide groove, 67: Swing member, 70: Actuator, 71: Switch.

Claims (1)

[Claims] 1. A cam provided on an intermittent gear driven by a motor, and a switching member operated by the cam,
an electromagnetic plunger; a holding member that is attracted and held by the electromagnetic plunger when the electromagnetic plunger is energized; and a holding member that is connected to the holding member via a spring, is pivotally supported by a fixed frame, and is rotated by the holding member that is attracted and held. a locking member, a driven member, and a control member rotatably attached to the driven member and engaged with the locking member by preventing the locking member from rotating, thereby transmitting the operation of the switching member to the driven member. A transmission device in a cam mechanism, characterized by comprising: