JPS6323798Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a spring biasing structure for a claw detection lever that detects the presence or absence of an accidental erasure prevention claw on a tape cassette and a lock member that locks a recording operation member.

In conventional cassette tape recorders, the spring for biasing the claw detection member to prevent accidental erasure and the spring for biasing the lock member are often provided independently, which is disadvantageous in terms of the number of parts and assembly man-hours. It was hot.

The present invention uses one double torsion coil spring, a so-called double torsion spring, to bias at least the pawl detection member and the lock member, and to bias the pawl detection member as the lock member moves during recording operation. It is an object of the present invention to provide a tape recorder that can increase the spring biasing force on the tape recorder and more reliably detect the presence or absence of an erroneous erasure prevention claw.

That is, the tape recorder according to the present invention is characterized in that one end of the first coil portion of the double torsion coil spring supported by the shaft embedded in the board is locked to a claw detection member for detecting a claw to prevent accidental erasure. , one end of the second coil portion of the double torsion coil spring is locked to a movable member or a fixed member, and a continuous portion of the other end of each of the first coil portion and the second coil portion is connected to at least a recording operation member. is engaged with a locking member for locking the recording operation member, and while the recording operation member is moving to the locking position, the locking member is moved to deform the double torsion coil spring and increase the urging force on the claw detection member. It is to let

Below, preferred embodiments of the present invention will be described.
This will be explained with reference to the drawings.

FIG. 1 shows a tape recorder 1 for microcassettes to which the present invention is applied, and is a schematic plan view with the bottom plate (or partition plate) removed of a cassette storage section into which a microcassette 2 is installed.
In FIG. 1, a magnetic head 3 for recording and playback is shown.
and the slide chassis 5 to which the pinch roller 4 is attached and fixed, press the arrow A of the playback button 6 or the recording button 7.
It moves in the same arrow A direction in response to the pressing operation in the direction. At this time, the magnetic head 3 comes into contact with the magnetic tape of the microcassette 2, and the pinch roller 4 presses the magnetic tape onto the capstan shaft 8, and the rotation of the capstan shaft 8 drives the magnetic tape to run. . Furthermore, when the recording button 7 is pressed in the direction of arrow A, the erasing head 9 also comes into contact with the magnetic tape. These play button 6 and record button 7 are locked by pressing in the direction of arrow A, and then by pressing the stop button 10 in the direction of arrow A.
The above-mentioned lock is released and the system enters a stopped state. next,
The torsion coil spring 11 is a return spring for the slide chassis 5 and the recording operation lever 12, which will be described later. The supply reel shaft 13 is fixed to a rotating shaft 16 that is rotatably mounted on a reel shaft support lever 15 that is rotatable around a shaft 14, and the take-up reel shaft 17
is rotatably attached to a rotating shaft 18 fixed to a fixed substrate of the tape recorder or the like.

Next, FIG. 2 shows a schematic plan view with the slide chassis plate 5 removed. In this example, the playback operation lever 21, the recording operation lever 12, the stop operation lever 23, and other levers are formed by molding of synthetic resin such as plastic, and the playback button 6, recording button 7, and The stop button 10 is pressed on each lever 21, 1, respectively.
2 and 23 is also possible. These operating levers 21, 12, 2
3 move in parallel in the direction of arrow A, for example, guide pins 24, 25, 25 fixed to the housing or chassis of the tape recorder 1, etc.
Elongated holes 27, 28, 29 for guiding 26 etc., respectively.
etc. are provided. Note that among the pins, rotating shafts, etc. in the figure, those whose positions are fixed with respect to the tape recorder main body are hatched.

In FIG. 2, the playback operation lever 21 includes a locking pawl 31, a power switch pin 32, a convex portion 33 that is pressed during recording operation, and a spring support portion 35 that supports one end of a torsion coil spring 34. is provided, and this playback operation lever 2
The slide chassis 5 described above is coupled and fixed onto the slide chassis 1 with screws or the like.

The recording operation lever 12 includes a step-like protrusion 41 that presses the protrusion 33, a locking pawl 42, a protrusion 43 for operating the recording switch, and a pawl detection lever 44 for preventing accidental erasure. An inclined portion 45 serving as a related first regulating portion and a shoulder portion 46 serving as a regulated portion are provided, and the above-mentioned erasing head 9 is mounted and fixed on this recording operation lever 12.

A tension coil spring 36 is attached to the stop operation lever 23.
A claw portion 37 that locks one end of the lever and a recess 39 that engages with the protrusion 38a of the first lock release auxiliary lever 38 are provided.

Here, when the regeneration operation lever 21 is pressed in the direction of arrow A, the inclined part of the locking claw part 31 comes into contact with the inclined part of the engaging claw part 52 of the lock lever 51, and this lock lever 51 is rotated clockwise. let Since a biasing force in the counterclockwise direction (in the direction of arrow b) is applied to this lock lever 51 by a torsion coil spring 53, when the claw portion 31 of the regeneration operation lever 21 climbs over the engaging claw portion 52 of the lock lever 51. Then, the lock lever 52 rotates in the direction of arrow b and returns to its original state, and the regeneration operation lever 21
The claw portion 31 is engaged with the engaging claw portion 52 to be in a locked state. At this time, the regeneration operation lever 21 operates a switch operation lever (not shown) using the pin 32 to turn on the power switch (not shown), and the spring support part 35 causes the torsion coil spring 3 to turn on.
4 in the direction of arrow A.

Next, when the recording operation lever 12 is pressed in the direction of arrow A, the step-like protrusion 41 presses the protrusion 33 of the reproduction operation lever 21, so that the reproduction operation lever 21 also moves in the direction of arrow A at the same time. here,
If the micro cassette 2 in Fig. 1 has a erroneous erasure prevention claw on the side, the recording operation lever 12 should be moved in the direction indicated by the arrow A.
The locking claw portion 42 engages with the engaging claw portion 52 of the lock lever 51 and is locked, and the protrusion 43 torsion rotates the coil spring 55 to turn the recording selector switch 56 on. .

Next, when the playback operation lever 21, the recording operation lever 12, etc. are locked by the lock lever 51, move the stop operation lever 23 in the direction of arrow A.
When pressed in the direction, the first lock release auxiliary lever 38 rotates clockwise, and the protrusion 38b at the tip rotates.
is one end 57a of the second lock release auxiliary lever 57.
Press to rotate this lever 57 counterclockwise. At this time, the protrusion 57b at the other end of the second lock release auxiliary lever 57 presses the first contact portion 51a of the lock lever 51, and the lock lever 5
1 in the clockwise direction, the engaging claw portion 52 is disengaged from the claw portion 31 of the playback operation lever 21 and the claw portion 42 of the recording operation lever 12, and these playback operations are performed by the biasing force of the torsion coil spring 53 mentioned above. The lever 21 or the recording operation lever 12 moves in the direction opposite to the arrow A and returns to its original state.

FIG. 3 is a plan view schematically showing a drive system for driving the tape running, and the rotational driving force from the motor is transmitted to the capstan shaft 8. As shown in FIG. A drive gear 61 is connected to the capstan shaft 8, and the drive gear 61 is constantly rotating when the power switch is turned on and the motor is rotating. The capstan shaft 8 is provided with a switching lever 58 that can freely swing around the capstan shaft 8.
Two gears 62 and 63 connected to each other are rotatably supported at 9 . Further, this switching lever 58 is integrally formed with a base portion 58a as shown in FIG.
The other end of the torsion coil spring 34 is supported by the torsion coil spring 8b, and a counterclockwise biasing force is applied to the switching lever 58. Gear 62 of this switching lever 58
is always in mesh with the drive gear 61, and the other gear 63 is in mesh with the gear 64 for driving the take-up reel shaft 17. When the regeneration operation lever 21 is operated in the direction of arrow A, one end of the torsion coil spring 34 moves to the position shown by the broken line, and the aforementioned power switch rotates the capstan shaft 8 and the drive gear 61, and this rotational force is The signal is transmitted via gears 62 and 63 to a gear 64 for driving the take-up reel. This gear 64 transmits rotational force to the take-up reel shaft 17 through frictional contact, and rotates the take-up reel shaft 17 in accordance with the rotation of the gear 64 with so-called slippage. At this time, the rotation direction of each gear, etc., is that the capstan shaft 8 and drive gear 61 are clockwise (arrow d direction), the gears 62 and 63 are counterclockwise, and the take-up reel shaft 17 and gear 64 are clockwise (direction of arrow d). (direction of arrow e). Therefore, a force in the direction of arrow c that causes gear 63 to disengage from gear 64 is applied to gear 63, but during playback and recording, one end of torsion coil spring 34 moves to the position indicated by the broken line in the figure, and this Switching lever 58 by coil spring 34
Since the biasing force in the counterclockwise direction increases, the gear 6
3 and 64 is prevented from coming off.

Next, the auto-shutoff operation will be explained. When the magnetic tape of the microcassette 2 described above travels in one direction and reaches the end of the tape, the tape end is clamped by the reel, so that the driving force of the magnetic tape increases the tape tension. act to pull the supply reel shaft 13 along the tape running direction. This tensile force is applied to the reel shaft support lever 15 via the supply reel shaft 13.
, clockwise around the axis 14 (direction of arrow f)
It acts to rotate it. At this time, the vertical protrusion 15a of the reel shaft support lever 15 presses one end 65a of the shutter-off arm 65, and the shutter-off arm 65 rotates slightly counterclockwise about the shaft 66. This shutdown arm 65
is provided with a sector gear 65b on the other end side, and by the slight rotation, this sector gear 65b
reaches a position where it can mesh with the partially toothed gear 67 connected to the gear 64 of the take-up reel shaft 17. Here, even when the end of the tape has been reached, as long as the power switch is on, the motor is rotating and the capstan shaft 8 is rotating, and this rotational force is applied to the gear 64.
The gear 64 and the partially toothed gear 67 are
It is rotating clockwise (arrow e direction). Therefore, since meshing with the sector gear 65b starts from a predetermined rotation angle position of the partially toothed gear 67, the shutter-off arm 6
5 further rotates counterclockwise. Then, one end 65a of the shutter-off arm 65 presses the second abutting portion 51b of the lock lever 51, and the lock lever 51 is rotated clockwise (in the direction opposite to arrow b), so that the engaging claw portion 52 and the above-mentioned claw are rotated. The engagement with the portions 31 and 42 is disengaged, and the lock is released.

Next, fast forwarding and rewinding operations will be explained.
These fast forward and rewind operation buttons 70 are
The lock release plate 71 is connected to the lock pin 51 of the lock lever 51.
The pin 7 is attached to the locked plate 72 which is locked by c.
3. This locked plate 72
A cut-and-raise claw 74 is formed at the end of the torsion coil spring 75, and the cut-and-raise claw 74 is held between the open ends of the torsion coil spring 75. This torsion coil spring 7
5 is connected to an auxiliary lever 76 for fast forwarding and rewinding, and is rotatable around a shaft 77.
One end 76a of this auxiliary lever 76 contacts one end 78a of the fast-forwarding lever 78 shown in FIG.
It is in contact with the vertical protrusion 58d of No.8. Note that the claw portion 71a of the lock release plate 71 is for operating a lever for operating a power switch or the like. The other end 78b of the fast-forwarding lever 78 supports the other end of the tension coil spring 36 shown in FIG. .

First, in order to enter fast forward mode, press operation button 7.
0 in the direction of arrow FF, the lock release plate 71 moves in the same direction, and a lever or the like is operated by the claw portion 71a to turn on the power switch. At the same time, the locked plate 72 also moves in the direction of the arrow FF and rotates the auxiliary lever 76 clockwise.
Press. At this time, the fast forward lever 78 is
A gear 81 that rotates counterclockwise around axis 9 and is supported by a rotating shaft 80 provided on this fast-forwarding lever 78 meshes with the drive gear 61 . The drive gear 61 starts rotating when the power switch is turned on, and this rotational force is applied to the gear 81,
The signal is transmitted via 82, 83, and 84 to another gear 85 for driving the take-up reel. This gear 85 is connected to the take-up reel shaft 17 and rotates together with the take-up reel shaft 17, and rotational force is directly transmitted to the take-up reel shaft 17. Further, a protrusion 78c provided in the middle of the fast-forwarding lever 78 is connected to the switching lever 58.
In order to press the end portion 58c of the base portion 58a, the switching lever 58 rotates slightly clockwise about the shaft 8, and the gear 63 and the take-up reel driving gear 6
The mesh with 4 is released. Note that at this time, one end of the torsion coil spring 34 is at the solid line position in the figure, so a relatively small force is required to rotate the switching lever 58 clockwise.

Next, when moving the operation button 70 in the direction of the arrow REW to enter the rewind mode, the claw portion 7
The power switch is turned on by 1a, and the auxiliary lever 76 is rotated counterclockwise. At this time, the intermediate protrusion 76b of the auxiliary lever 76
In order to press the vertical protrusion 58d of the shaft 1, the switching lever 58 rotates clockwise, and the gear 63
It meshes with a gear 86 that rotates around 4. This gear 86 meshes with a gear 87 for driving the supply reel. Therefore, due to the rotational force of the drive gear 61 in the clockwise direction (arrow d direction), the gears 62, 6
3 rotates counterclockwise and the gear 86 rotates clockwise, the gear 87 for driving the supply reel is rotationally driven in the counterclockwise direction. Even in this rewinding mode, since one end of the torsion coil spring 34 is at the solid line position in the figure, the clockwise rotational force of the switching lever 58 is relatively small.

Next, the vicinity of the claw detection lever 44 and the lock lever 51 for preventing erroneous erasure, which are the essential parts of the present invention, will be explained in detail.

FIG. 4 is an exploded perspective view for explaining the mounting structure of the pawl detection lever 44 and the lock lever 51. These levers 44 and 51 are molded with resin such as plastic, and are rotatably supported by shafts 91 and 92 implanted in a fixed substrate 90, respectively. The shaft 91 supporting the claw detection lever 44 has first and second coil parts 53a, 53.
A double torsion coil spring 53 having a shape in which b is stacked in the axial direction is supported, and this double torsion coil spring 5
One end of the first coil portion 53a of No. 3 is locked to the protrusion 44p of the pawl detection lever 44. One end of the second coil portion 53b of the double torsion coil spring 53 is locked to a pin 93, which is a fixing member implanted in the fixed substrate 90, for example. Further, the other ends of the first and second coil portions 53a and 53b of the double torsion coil spring 53 are continuous, and this continuous portion 53
c is engaged with a protruding claw portion 51d of the lock lever 51. Note that one end of the second coil portion 53b may be locked to a pin 94a of a movable member such as an auxiliary lever 94 for operating the power switch.

In the structure shown in FIG. 4, the lock lever 51
is for locking the aforementioned playback operation lever 21, recording operation lever 12, etc., and in order to maintain this locked state, it is necessary to apply a relatively large spring biasing force in the direction of arrow b. be done. In response to this request, the continuous portion 53 of the double torsion coil spring (or double torsion spring) 53
c, the first and second coil portions 53a, 53b
A strong force can be applied to the lock lever 51 by adding the elastic return force of . Further, when the recording operation lever 12 is pressed in the direction of arrow A, the lock lever 51 is rotated in the opposite direction (clockwise) to the direction of arrow B, and at this time, the double torsion coil spring 53 is further elastically deformed in the closing direction. As a result, the spring biasing force of the claw detection lever 44 in the counterclockwise direction, which is the claw detection direction, further increases. This increase in spring biasing force makes it possible to more reliably perform the operation of detecting the erroneous erasure prevention claw of the microcassette, which will be described later.

Next, FIGS. 5 to 8 show the claw detection lever 4.
Accidental erasure prevention claw 20 of micro cassette 2 by 4
FIG. 3 is a plan view showing an extracted main part for explaining the detection operation of the FIG.

First, FIG. 5 shows a state before a recording operation is performed, such as a stopped state or a playback state similar to the above-described FIGS. 1 to 3. A biasing force is applied to the pawl detection lever 44 by the double torsion coil spring 53 described above in the counterclockwise direction, which is the pawl detection direction.
Contact portion 44b at the shoulder position of this claw detection lever 44
comes into contact with the inclined portion 45, which is the first restricting portion of the recording operation lever 12, and its rotation in the counterclockwise direction by the spring biasing force is restricted. At this time, the contact 44a at the tip of the claw detection lever 44 is placed at a constant distance _g1 from the accidental erasure prevention claw 20 on the side surface of the microcassette 2, and is in a non-contact state. Therefore, when the tape recorder is in a stopped state, the contact 44 of the claw detection lever 44
Since point a is retracted, it is prevented from interfering with the insertion and mounting operations of the microcassette 2. Further, the lock lever 51 shown in FIG. 5 is given a spring biasing force in the direction of arrow b by a double torsion coil spring 53, and its rotation in the direction of arrow b is restricted by a stopper 95 provided on a fixed board or the like. There is. Next, on the side of the recording operation lever 12,
A base portion 47 is formed that protrudes toward the front side in the figure, and a shoulder portion 46 at the tip of this base portion 47 is controlled by a second restriction portion 44c at the rear end of the claw detection lever 44 when the claw is not present. It becomes a regulated part.

Next, in FIG. 6, move the recording operation lever 12 to arrow A.
This shows a state in the middle of a pressing operation in the direction. As the recording operation lever 12 moves in the direction of arrow A, the contact position between the inclined part 45, which is the first regulating part, and the contact part 44b of the claw detection lever 44 moves further inward (leftward in the figure). Therefore, the claw detection lever 44 gradually rotates in the claw detection direction (counterclockwise), and the tip of the contact 44a reaches the position of the accidental erasure prevention claw 20 of the microcassette 2. Therefore, if the claw 20 is provided, the rotation of the claw detection lever 44 is regulated by the claw 20, and at this time, the second regulating portion 44c of the claw detection lever 44 is connected to the shoulder, which is the regulated portion of the recording operation lever 12. The second regulating portion 44 does not face the portion 46, that is, the second regulating portion 44 is located on the movement trajectory of the shoulder portion 46.
c is not disposed, and the recording operation lever 12 can be further pressed in the direction of arrow A. Furthermore, in the state shown in FIG.
When the recording operation lever 12 is further pressed in the direction of arrow A, the lock lever 51 is rotated clockwise and the double torsion coil spring 53 is further elastically deformed to close. The spring biasing force in the claw detection direction increases, and the detection of the erroneous erasure prevention claw 20 can be performed more reliably.

FIG. 7 shows a locked state in which the recording operation lever 12 is further pressed from the state shown in FIG. At this time, the inner apex P of the shoulder portion 46, which is the regulated portion at the tip of the base portion 47, presses the side inclined portion 44d of the pawl detection lever 44, resisting the spring biasing force and opposing the pawl detection. Clockwise direction of the claw detection lever 4
4, the contact 44a is separated from the accidental erasure prevention claw 20 of the microcassette 2 and retracted. Therefore, unnecessary pressing force or the like is not applied to the microcassette 2 during the recording operation, and adverse effects of tape running or auto-shut-off operation and displacement of the cassette are prevented.

Next, FIG. 8 shows a state in which the recording operation lever 12 is pressed in the direction of arrow A when the microcassette 2 does not have the accidental erasure prevention claw 20. That is, in response to the pressing operation of the recording operation lever 12 in the direction of arrow A, the inclined portion 45, which is the first regulating portion,
After passing through the state shown in FIG. 6, since there is no accidental erasure prevention claw 20, the abutting portion 44 of the claw detection lever 44 as shown in FIG.
abuts further inside position (left position in the figure) with b,
The pawl detection lever 44 further rotates in the counterclockwise direction, which is the pawl detection direction. At this time, the claw detection lever 44
The second regulating part 44c is the shoulder part 4 which is a part to be regulated.
6, when the recording operation lever 12 is pressed in the direction of arrow A, the shoulder portion 46, which is the restricted portion, comes into contact with the second restriction portion 44c, and movement in the direction of arrow A is restricted. Ru. Also, since the inclined part 42a of the locking claw part 42 of the recording operation lever 12 presses the inclined part 52a of the engaging claw part 52 of the lock lever 51 and rotates the locking lever 51 clockwise, the locking lever 51 is rotated clockwise. The biasing force exerted by the coil spring 53 on the claw detection lever 44 in the claw detection direction increases, and the presence or absence of the erroneous erasure prevention claw 20 can be detected more reliably. Furthermore, the contact surfaces of the second regulating portion 44c and the shoulder portion 46, which is the regulated portion, are provided with a pressing force in the direction of arrow A of the recording operation lever 12 to a turning force in the claw detection direction of the claw detection lever 44. Since an inclination for conversion is provided, even if the recording operation lever 12 is pressed with a strong force, there will be no inconvenience such as the second restriction part 44c of the claw detection lever 44 coming off from the shoulder part 46. In addition, a stopper 96 that supports the side inclined portion 44d of the claw detection lever 44 is formed by bending a part of the metal chassis such as the bottom plate of the cassette storage section.
This stopper 96 restricts the rotation of the pawl detection lever 44 in the pawl detection direction. Therefore, even if an unnecessarily large force is applied to the pawl detection lever 44, which is made of a resin molded part such as plastic, which has relatively low strength, through the shoulder portion 46 of the recording operation lever 12, the metal stopper 96
Since the claw detection lever 44 is supported and reinforced, failures such as bending and breakage can be prevented.

As is clear from the above description, according to the present invention, since the pawl detection lever 44 and the lock lever 51 are rotationally biased using one double torsion coil spring 53, the number of parts can be reduced and the number of assembly steps can be reduced. It is possible to achieve reductions and reduce costs. Further, while the recording operation lever 12 is pressed in the direction of arrow A, the lock lever 51 is rotated counterclockwise, and the rotation biasing force exerted on the claw detection lever 44 by the double torsion coil spring 53 is increased. , the presence/absence detection operation of the erroneous erasure prevention claw 20 can be performed more reliably.

Furthermore, according to the configuration of the above embodiment, the claw detection lever 44 is activated when the recording operation lever 12 is operated.
The contact 44a only contacts the accidental erasure prevention claw 20, and the contact 4 of the claw detection lever 44 contacts when inserting or removing a cassette, or when driving the tape.
Since the tape 4a is retracted, it does not interfere with the cassette insertion or ejection operation, and does not adversely affect the tape running operation, auto-shut-off operation, etc. Furthermore, since the pawl detection lever 44 is formed by molding a synthetic resin such as plastic, costs can be reduced and a complex shape can be easily obtained. Furthermore, the reduction in mechanical breaking strength due to such a molded part is prevented by reinforcing it with a metal stopper 96, thereby increasing the apparent breaking strength.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but can also be applied to, for example, a normal (Philips type) cassette, and the claw of the cassette is not limited to an accidental erasure prevention claw. In addition, various modifications can be made without departing from the gist of the present invention.

[Brief explanation of the drawing]

The figures all show embodiments of the present invention; Fig. 1 is a schematic plan view of the tape recorder with the bottom plate removed, and Fig. 2 shows the tape recorder of Fig. 1 with the slide chassis 5 removed. 3 is a schematic plan view showing the gear mechanism of the tape running drive system, FIG. 4 is an exploded perspective view showing an example of the mounting structure of the claw detection lever and the lock lever, and FIGS. 5 to 8 The figure is a plan view showing a main part extracted for explaining the operation of detecting the erroneous erasure prevention claw by the claw detection lever. 2... Micro cassette, 12... Recording operation lever, 20... Erroneous erasure prevention claw, 42... Lock claw part, 44... claw detection lever, 44a... Contact, 44b... Contact part, 44c... second regulating part, 45... inclined part serving as first regulating part, 46...
...Shoulder portion serving as a regulated portion, 53...Double torsion coil spring, 53a...First coil portion, 53b...Second coil portion, 53c...Continuous portion.

Claims (1)

[Scope of utility model registration request] One end of the first coil portion of the double torsion coil spring supported by a shaft implanted in the substrate is latched to a claw detection member for detecting an erroneous erasure prevention claw, and the second coil portion of the double torsion coil spring is one end is locked to a movable member or a fixed member, and connecting portions at the other ends of the first coil part and the second coil part are locked to at least a locking member for locking the recording operation member, A tape recorder characterized in that, while the recording operation member is moving to a lock position, the locking member is moved to deform the double torsion coil spring to increase the urging force on the claw detection member.