JPS6314416B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape device.

Conventionally, there are devices in which the crimping operation of the head and the operation of switching the running direction of the tape are performed by using a cam that is driven in accordance with the rotation of the motor. This type of device directly connects the actuating member that performs the head crimping operation to the cam so that the drive of the cam is directly transmitted to the actuating member, and only when the actuating member is in the head crimping position. A switching member for switching the running direction of the tape is operable.

However, with such conventional devices, if the power is turned off and the motor stops during the crimping operation of the head by the cam, the head will stop at an unstable position in the middle of shifting. If an attempt is made to perform a rewind operation or an eject operation, the operation must wait until the crimping operation of the head is completed, and if the operation is performed forcefully, the head etc. may be damaged. Furthermore, if the switching member is deactivated while the switching member is in the middle of operation, the switching member will stop at an unstable position in the middle of switching, and as a result, not only will it be impossible to completely switch the running direction of the tape, but also the subsequent There were various drawbacks, such as the fact that the tape could not run.

The present invention eliminates the drawbacks of the above-mentioned conventional devices, and makes it possible to release the transmission between the actuating member and the cam that performs the crimping operation of the head even during the crimping operation of the head, and also performs the operation of switching the running direction of the tape. It is an object of the present invention to provide a magnetic tape device in which the operation of the switching member is not canceled even if the operation of the operating member is canceled during the operation of the switching member.

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

The drawings show an embodiment in which a head crimping operation is performed in addition to the tape running direction switching operation, and in the following description, terms such as up, down, left, and right refer to the directions in the drawings. First, parts related to the crimping operation of the head will be explained with reference to FIGS. 1a to 6a.
1' is a capstan provided 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 attached to the fixed frame, and has a notch 4.
The other part is an intermittent gear that meshes with the gear 2. Reference numeral 5 is a cam that is integrally provided with the intermittent gear 3, and a step part 6 is formed at the intermittent part. 7 is a guide pin 8, 8' provided on the fixed frame with a long groove 9,
9' is a switching member fitted and attached to be movable left and right, 10 is a roller (or pin) provided on the switching member 7 and engages with the cam 5, and 11 urges the switching member 7 leftward. It is a spring, and this spring 1
The roller 10 is brought into contact with the cam 5 by a tensile force of 1. As shown in FIG. 1a, 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 the roller 10 is in contact with the step 6 of the cam 5.
The intermittent gear 3 is urged to rotate counterclockwise toward a position where it meshes with the motor 2 by the force that causes the gear 0 to move leftward. The stopper member 12 resists this urging force and stops the intermittent gear 3 at the position shown in FIG. 1a. 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 upward position as shown in Figure 2a, but also when pushed downward as shown in Figure 3a,
The fulcrum 23 is kept in contact with the upper end of the slot 21 until the upper end of the stroke limiting groove 18 contacts the guide pin 17 and the actuating member 16 can no longer move downward.

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 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 biases the fitting part 35 rightward toward the right end bottom of the groove 37 with respect to 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 to the right so as to draw the movable core 39 into the holding plunger 40. The tensile force of the spring 38 is greater 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 condition, and when the retaining plunger 40 is de-energized as shown in FIG. 6a, spring 40
The locking member 32 is rotated counterclockwise against the tensile force of the locking member 32 to release the locked state.

42 is provided on the fixed frame, and the control member 22
A stopper 43 for limiting the clockwise rotation range of the control member 22 is provided on the fixed frame.
Even after the inclined surface 24 comes off the protrusion 31 of the sector member 28 when it is displaced from the position shown in the figure to the position shown in FIG. 6a, it still follows the locking member 32 and rotates counterclockwise. This is a restriction piece that restricts the rotation range of the control member 22 in the counterclockwise direction in order to prevent the upper inclined surface 26 from becoming difficult to detach from the protrusion 34 of the lock member 32.

Next, referring to FIGS. 7 to 12 as well as FIGS. 1B to 6B, the parts related to the switching operation of the tape running direction will be explained. Reference numeral 44 is a switching cam whose fulcrum 45 is pivotally supported on a fixed frame. 45
A substantially V-shaped cam groove 46 is formed between the two, and a projection 47 is provided at the lower end. By swinging the switching cam 44 around the fulcrum 45,
As the protrusion 47 moves left and right, the channel switching plate 49, only partially shown, is moved left and right through the groove 48 fitted into the protrusion 47, thereby switching the running direction of the tape and the channel. It's getting old. Reference numeral 50 denotes a connecting member in which a fulcrum 51 is movably fitted into a slot 52 formed in the switching member 7 and pivotally supported, and a working pin 53 fitted in a cam groove 46 is provided at the left end. . 54 is a spring that urges the fulcrum 51 downward, and 55 is a spring that urges the working pin 53 leftward. The slot 52 is approximately J-shaped with a recess 56 at the lower right side, and the recess 56 is connected to a fulcrum 5 as shown in FIGS.
1 is positioned so that when it falls, the fulcrum 51 and the fulcrum 45 are at approximately the same height, and the left side of the recess 56 serves as a locking portion 57. 58 is the slot 52
is a step formed on the actuating member 16 adjacent to the step 58, and when the actuating member 16 is in the upper end position (i.e., the release position of the head 19) as shown in FIGS. 1b and 2b, the upper side of the step 58 is It is positioned so that it is approximately at the same height as the lower side of the slot 52, and the stepped portion 5
The inclined side continuous to the right end of the upper side of the recess 56 is formed to extend to approximately the same height as the lower side of the recess 56 .

The apparatus of the above embodiment operates as follows.

First, the crimping operation of the head will be explained. When the device is not in operation, it is in the state shown in FIG. 1a. At this time, the fulcrum 51 of the connecting member 50 is located at the recess 5 of the slot 52.
It is located to the left of 6. (See Figure 1b). 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, roller 1
Due to the leftward movement of the switching member 7 in conjunction with the leftward movement of the switch 0, the protrusion 31 of the sector member 28 moves upward and disengages from the right side of the control member 22 above the inclined surface 24, causing the control member 22 to move clockwise. The control member 22 and the lock member 32 can be rotated.
The holding member 36 is moved clockwise and to the right by the tensile force of the spring 41, and the movable core 39 is attracted and held by the energized holding plunger 40 (see FIG. 2a). At this time, the fulcrum 51 of the connecting member 50 is directly above the recess 56, but because it rides on the step 58 of the actuating member 16, it does not fall into the recess 56 (see Fig. 2b).

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. 3a). At this time, the fulcrum 51 of the connecting member 50 is located to the left of the recess 56 of the slot 52 (see FIG. 3b).

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 Figure 4a). At this time, the fulcrum 5 of the connecting member 50
1 is located almost at the left end of the slot 52 (No. 4b
(see figure).

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 fulcrum 23 of the control member 22 is located 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 crimping position (see FIG. 5a). This locked state will be maintained during the tape play operation. At this time, the fulcrum 51 of the connecting member 50 is in substantially the same position as in FIG. 1b (see FIG. 5b).

In the process from FIG. 2a to FIG. 5a and in the locked state shown in FIG. 5a, if an operation involving release of the head is to be performed, the holding plunger 40 may be de-energized. The retaining member 36 and locking member 32 then lose their holding force due to the retaining plunger 40, so that the actuating member 16
Spring 2 biases control member 22 upwardly via
A tension of 0.20' overcomes the tension of spring 41 which biases control member 22 clockwise through retaining member 36 and locking member 32. Therefore, the control member 22 rotates counterclockwise so that the inclined surface 24 escapes the projection 31 of the sector member 28 and comes off from the projection 31, and the upper inclined surface 26 pushes the projection 34 of the locking member 32 to the left. While rotating the lock member 32 counterclockwise, the lock member 32 is removed from the protrusion 34, and the lower end of the stroke limiting groove 18 contacts the guide pin 17 (i.e., the position where the lower end of the stroke limiting groove 18 contacts the guide pin 17).
9) and stops. When the holding plunger 40 is de-energized in the process approximately shown in FIGS. 3a and 3b, the state shown in FIGS. 6a and 6b is reached. If the motor continues to rotate, the intermittent gear 3 will continue to rotate from the position shown in FIG. 6a and then stop at the position shown in FIG. 1a.

Further, even if the power is cut off in the process from FIG. 2a to FIG. 5a and in the locked state of FIG. 5a, the power to the holding plunger 40 is cut off.
The actuating member 16 will immediately move to the release position of the head 19.

Next, the tape running direction switching operation will be explained. When the release plunger 13 is energized in the tape play state shown in FIG. 5a, the stopper member 12 comes off the protrusion 15, the cam 5 rotates, and the intermittent gear 3 meshes with the gear 2 as in FIG. 2a. On the other hand, since the actuating member 16 is at the lower end position (that is, the crimping position of the head 19), as the switching member 7 moves leftward, the fulcrum 51 of the connecting member 50 falls into the recess 56 due to the tensile force of the spring 54 (the seventh (see figure).

From this state, as the switching member 7 moves to the right due to the rotation of the intermittent gear 3, the connecting member 5
0, the fulcrum 51 is locked to the locking part 57 and the spring 5
It is moved to the right against the pulling force of 5. Therefore, the working pin 53 fits into the upper part of the cam groove 46 and pulls its right end to swing the switching cam 44 clockwise, thereby moving the channel switching plate 49 to the left via the protrusion 47. The running direction of the tape and the channel will be changed (8th,
(See Figure 9).

When the intermittent gear 3 rotates once and the protrusion 15 is locked with the stopper member 12, the connecting member 50 moves to the left together with the switching member 7, and the working pin 53 is positioned at the left end of the upper part of the cam groove 46. It stops at that point (see Figure 10).

In the process from FIG. 8 to FIG. 9, that is, during the operation of the switching cam 44, even if the actuating member 16 returns from the lower end position to the upper end position, the recessed portion 56 is located to the right of the inclined side of the stepped portion 58. Since the stepped portion 58 does not enter the recessed portion 56 when the fulcrum 51 is
6, and the connecting member 50 is kept in a state in which the fulcrum 51 is locked to the locking portion 57 (see FIG. 11).

When the actuating member 16 returns to the upper end position,
For FF/REW operation, for eject operation, when the power to the mechanism is cut off (to prevent the pinch roller etc. from being left in the crimping position and being deformed), and stop operation when a stop mode is provided. .

During FF/REW operation (when the motor can be energized even if regeneration is stopped during stop operation), the motor is energized and the flywheel rotates, so the intermittent gear 3 and cam 5 do not rotate. The switching member 7 continues to slide to the right. Since the connecting member 50 remains locked to the switching member 7, the switching cam 44 continues to rotate, and when the channel switching plate 49 has made the required stroke, the switching member 7 reaches the top of the cam 5, and the switching is completed. Part 7
passes over the apex and returns to the left, and the fulcrum 51 of the connecting member 50 reaches the step 5 at the rear end of the actuating member 16.
When passing through the switching member 8, it is pushed backward and disengaged from the switching member 7. This puts the power mechanism in the reset state when the head is retracted, and the F.
F. To end the REW operation and start playback,
In addition to being able to respond immediately to head shift operations, problems such as not being able to start running the tape because the channel switching plate 49 is in the intermediate position do not occur.

Next, when an eject operation is performed or the power is turned off (when the motor is de-energized by a stop operation), the power is turned off and the cam 5 of the power mechanism remains stopped in the middle of operation. At this time, when the cassette is inserted for reuse or the power supply is restarted, the cam 5 of the power mechanism normally rotates for a full cycle, and if it is in the reset state, the head shift mechanism operates and the tape is played back. In this case, since the cam 5 is at an intermediate position and in mesh with the intermittent gear 3, it rotates for the remaining cycle at the same time as the motor rotates, and is temporarily reset. During this time, the channel switching plate 49 is not engaged with the head shift mechanism, and the channel switching plate 49 is returned from the intermediate position to the predetermined position, and then the head shift operation is performed as described above.

Also, after the operation of the switching cam 44 is completed, that is, the 10th
When the actuating member 16 returns from the lower end position to the upper end position in the state shown in the figure, in this case the step 58 is in a position where it enters into the recess 56, so the step 58 pushes up the fulcrum 51 and removes it from the recess 56 ( 12th
), so that the connecting member 50 returns to the position shown in FIG. 5b.

When the release plunger 13 is energized again from the state shown in FIG. 10, the switching cam 44 is now at the angle shown in FIG. 10 instead of the angle shown in FIG. 5b, so the working pin 53 fits into the lower part of the cam groove 46. Then, the switching cam 44 is swung counterclockwise, thereby moving the channel switching plate 49 to the right and switching the tape running direction to the opposite direction.

In the above embodiment, the control member 22 is pivoted to be movable up and down with respect to the actuation member 16, but it may simply be pivoted, and the holding plunger 40 may only be held in the process from FIG. 2a to FIG. 5a. Instead, it is also used for holding in the locked state shown in Fig. 5a, but it may also be provided separately, and in addition to the tape running direction switching operation, the head crimping operation is performed, but the present invention is not limited to this. It goes without saying that the present invention can be modified in various ways to the above-described embodiments.

Since this invention is constructed as described above, the transmission between the cam and the actuating member that performs the crimping operation of the head can be canceled even during the crimping operation of the head, and therefore, while the cam is performing the crimping operation of the actuating member with the head. The power may turn off and the motor may stop, or
When another operation is attempted, the actuating member can be brought into a stable state by de-energizing the electromagnetic plunger. In addition, during the operation of the switching member that performs the operation of switching the running direction of the tape, the operation of the switching member can be continued even if the operation of the operating member is canceled, so that the switching member stops at an unstable position in the middle of switching. This has excellent effects such as being able to always reliably and completely switch the running direction of the tape without causing the tape to run over.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and include parts 1a to 6.
Figure a is a plan view showing the operating state of the parts related to the crimping operation of the head, and Figures 1b to 6b are the first and second views.
FIGS. 7 to 10 are plan views showing portions related to the switching operation of the tape running direction in FIGS. 2b to 5b, respectively. , 12 are plan views showing the state of the connecting member when the actuating member returns. 1, 1': Capstan, 2: Gear, 3: Intermittent gear, 4: Notch, 5: Cam, 6, 58: Step,
7: Switching member, 8, 8', 17, 17', 17'':
Guide pin, 9, 9', 18', 18'': long groove, 1
0: Roller, 11, 14, 20, 20'27, 3
8, 41, 54, 55: Spring, 12: Stopper member, 13: Release plunger, 15, 31, 34,
47: Projection, 16: Operating member, 18: Stroke limiting groove, 19: Head, 21, 52: Slot hole, 2
2: Control member, 23, 29, 33, 45, 51:
fulcrum, 24, 25, 26: inclined surface, 28: sector member, 30, 35: fitting part, 32: lock member,
36: Holding member, 37, 48: Concave groove, 39: Movable core, 40: Holding plunger, 42: Stopper,
43: Regulating piece, 44: Switching cam, 46: Cam groove,
49: Channel switching board, 50: Connection member, 53:
Working pin, 56: recessed portion, 57: locking portion.

Claims (1)

[Scope of Claims] 1. A cam is provided on an intermittent gear driven by a motor, and a switching member operated by the cam is used to control an actuating member that brings the head to a crimping position against the biasing force of a biasing member and the tape running direction. A connecting member that operates a switching cam that switches the switching member, and has a connecting member that controls connection/disconnection between the switching cam and the switching member depending on the forward/backward position of the operating member, wherein the switching member is activated when the electromagnetic plunger is energized. a control member that operates the actuating member to the crimping position of the head, and releases the interlock between the switching member and the actuating member when the electromagnetic plunger is de-energized at the crimping position of the head and during the crimping operation; The operating member is provided with a control unit including a stepped portion for controlling the connecting member so that when the electromagnetic plunger is de-energized during operation of the switching cam, it can be determined whether the tape runs in either direction. A magnetic tape device featuring: 2. The magnetic tape device according to claim 1, wherein the stepped portion of the control portion provided on the operating member is tapered.