JPS5847538Y2 - Automatic stop device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a so-called mechanical auto-stop device that mechanically detects the end of tape running and automatically stops the tape winding operation.

Conventionally, various mechanical auto stops have been devised, but most of them have a tape end detection section and an operating section separately installed in the deck body, and the detection section consists of a rotating body (first It is of the type that is detected by a movable piece attached directly to the reel stand (reel stand) via a frictional engagement means, and is operated by placing a power drive source around it, and also has a separate blocking means to prevent malfunction during pauses. It had a configuration that provided.

Therefore, there are disadvantages such as the structure of the first reel stand and the space around it are often considerably restricted, the structure is complicated, and assembly is difficult.

The present invention solves the above points by separating the detection part from the first reel stand, allowing it to be carried out by the belt of the belt drive mechanism, for example, the counter drive belt, and also by integrating the drive part and means for preventing malfunction during pauses. By making it into a compact unit and arranging it outside the tape recorder main body, it allows flexibility in the structure of the first reel stand and its surroundings, and also ensures operation without reducing the space around it, making it easy to configure. The purpose of the present invention is to provide an inexpensive automatic operation stop device with good assembly workability.

An embodiment of the present invention will be described in detail below with reference to the drawings.

1 is a chassis forming the cassette tape recorder body;
IR and IL are the first,
The rotation of the flywheel 21 or another motor (not shown) is usually transmitted to one of the reel stands via a known transmission means (not shown) using the second reel stand.

During recording or reproduction, the tape runs from the second reel stand IL toward the first reel stand 1R via a bubble (not shown) in the cassette half.

Reference numeral 2 denotes a capstan with which a pinch roller (not shown) is pressed against which feeds at a constant speed, and is integrated with a flywheel 21 that ensures smooth rotation.

A capstan belt 3 is stretched between a motor pulley 4 attached to a motor (not shown) shaft and the flywheel 21.

A pulley portion IR1 is fixed to the first reel stand 1R, and a counter belt 5 is stretched between the pulley IR1 and a counter pulley 6.

Reference numeral 7 is a driving belt, which is stretched between a pulley portion 22 integrated with the flywheel 21 and a pulley portion 81 of a driving worm 8 rotatably supported by a bracket 14, which will be described later. is rotating.

Reference numeral 9 denotes a guide pulley, which is arranged so as to partially push up the counter belt 5, and is rotatably attached to a guide pin 111 fixed to a sliding plate 11, which will be described later, so as to rotate or stop following the running of the belt 5. installed.

A follow-up plate 10 is attached coaxially with the guide pulley 9 through a follow-up spring 15 as a frictional engagement means, a spring receiver 16, and a cap 17 so as to be swingable.
0 has protrusions 101 and 102 at the leading edge of the image across the axis.

The follower spring 15 has one end that presses the spring catcher 16 against the thrust direction receiving part of the guide pulley 9, and the other end of the follower spring 15 that has a T-shaped cross section that engages the follower plate 10 with the guide pulley 9. The following plate 10 follows the guide pulley 9 by pressing against the thrust direction receiving part.

Further, the spring tray 16 is regulated in the circumferential direction by the follower plate 10, which changes the shape of itself and the follower spring 15 in the circumferential direction (if there is no camp 16, the winding of the spring 15 changes depending on the direction of rotation of the guide pulley 9). may shrink or loosen.

), and by controlling fluctuations and losses, the followability of the follower plate 10 is made constant and stable.

Reference numeral 11 denotes a sliding plate, and the guide pulley 9 holding the follower plate 10 is attached to the guide pin 111 fixed to the sliding plate as described above.

The plate 11 also has a guide portion 112 and a long hole portion 113, and a long hole 141 provided in the bracket 14, which will be described later.
It is attached to the shaft 142 section with a button as shown in FIG. It is held in place on the bracket 14.

12 is a radial protrusion 1 that engages with the drive worm 8;
21 and a pair of opposing guide surfaces (cam surfaces) 122R and 122L on the shaft with the protrusion 121 in between, and is attached to the bracket 14 so as to rotate with 80 rotations of the drive worm. It is attached by a shaft 19.

Reference numeral 13 denotes a biasing arm rotatably supported by a bracket 14, which pushes the protrusion 102 of the follower plate 10 against the frictional engagement means with a spring 20 in relation to the pause button, causing the follower plate 10 to move forward. direction (clockwise), the tip protrusion 101 of the follower plate 10 engages with the left guide surface 122L of the worm cam wheel 12, and swings, causing the tip protrusion 101 of the follower plate 10 to engage the worm cam. This prevents the radial protrusion 121 of the wheel 12 from coming into contact with it, thereby preventing malfunction.

Further, the bracket 14 is configured to be attached to the chassis 1 as a unit.

Now, if the tape recorder is in recording or playback mode, the flywheel 21 is connected to the motor pulley 4 in FIG.
is rotating in the same direction as the counterclockwise rotation.

The capstan 2 also rotates in the same direction, and the tape sandwiched between the capstan 2 and a pinch roller (not shown) rotates from left to right, that is, the first reel stand 1R rotates counterclockwise. As is clear from FIG. 1, the guide boo 99 follows the running of the counter belt 5, which is hooked on the pulley portion IR1 of the reel stand and the counter pulley 6.
Rotate clockwise.

Therefore, as described above, the follower plate 10 attached to the pulley 9 via the frictional engagement means also follows the guide pulley 9 and rotates in the same direction.

On the other hand, in Figures 1 to 2, the drive worm 8 is rotated in the same direction as the flywheel 21 by the drive belt 7 from a pulley portion 22 integrated with the flywheel 21, and the worm 8 is engaged with the drive worm 8. The worm cam wheel 12 engaged with the worm cam wheel 12 is configured to rotate counterclockwise in FIG. 3.

The wheel 12 also has a radial protrusion 121 shown in FIGS. 3 and 4, and a wide opposite side facing the protrusion 121 in the axial thrust direction on the same side as the protrusion 121. It has narrow guide surfaces 122R and 122L, respectively.

Further, as described above, as shown in FIGS. 1 and 3 to 6, the follower plate 10 has a protrusion 101 at its tip, which guides the left and right guide surfaces 1 of the worm cam wheel 12.
It looks into 22L and 122R.

Therefore, as described above, the follower plate 10 follows the guide pulley 9 and rotates clockwise as shown in FIG. Left guide surface 1 because it cannot rotate
As the worm cam wheel 12 rotates while in contact with the worm cam wheel 22L, it rotates clockwise from the narrow part to the wide part, but as mentioned above, the radial protrusion 121 of the worm cam wheel 120 is on the wide side. The protrusion 12
1 cannot come into contact with the tip protrusion 101 of the follower plate 10, and as the worm cam wheel 12 rotates, the follower plate 10 moves from the wide part to the narrow part against the frictional engagement means. rotate counterclockwise.

However, as the counter belt 5 runs and the guide pulley 9 continues to rotate, in other words, while the first reel stand 1R continues to rotate, the follower plate 10 makes a swinging motion and the recording/playback state continues.

Further, even in the fast-forwarding state, the rotational speed of the first reel stand 1R is different, but the number of rotations in the same direction is the same as described above.

Note that when the pause button (not shown) is not pressed, the biasing arm 13 is moved against the spring 20 to the pose fitting (not shown) linked to the pause button, as shown in FIGS. 1 and 6. push it in the direction of the arrow in the figure, and press the protrusion 102 of the follower plate 10.
This eliminates pressure on people.

Also, when the pause button is pressed to enter the pause state, the pinch roller (not shown) will naturally separate from the gear press stan 2, the rotation of the first reel stand 1R will also stop, and the tape will stop running. Wheel 21 continues to rotate.

As shown in FIG. 7, in connection with the pause button (not shown), the blocking force of the pose fitting (not shown) blocking the biasing arm 13 is released, so the biasing arm 13 is moved by the spring 20. The protrusion 1 of the following plate 10 is rotated clockwise at
02 against the frictional engagement means to urge the following plate 10 in one direction (clockwise).

Therefore, even if the counter belt 5 stops running and the guide pulley 9 stops rotating when the tape stops running, the following plate 10 is urged in the same direction by the urging arm 13 as described above. Similar to the above, the tip protrusion 101 of the follower plate 10 makes a rocking motion against the frictional engagement means and the spring 20 at the left guide surface 122L of the guide surface facing the thrust direction of the worm cam wheel 12, and the follower plate The radial protrusion 121 of the worm cam wheel 12 can come into contact with the tip protrusion 101 of the worm cam wheel 10, so automatic stop does not occur and malfunction does not occur.

Next, the tape is transferred from the second reel stand IL to the first reel stand 1.
Considering the state where the run has finished in R (during recording playback or fast forwarding), the counter belt 5 guide pulley 9 stops rotating as the first reel stand 1R stops rotating (in this case, of course, the pause button is not pressed). The clockwise frictional force (followability) of the follower plate 10 disappears, but the tip protrusion 101 of the follower plate 10 does not touch the worm cam wheel 1.
As the wheel 12 rotates, the left guide surface 122 of the wheel 12
It is returned to the center at the narrow part of L.

However, as described above, since the followability of the follower plate 10 has disappeared, the plate 10 stops at that position, and as the worm cam wheel 12 continues to rotate, the radial protrusion 121 of the wheel 12 Follower plate 10
abutting engagement with the tip protrusion 101 and following play)10
<'Guide pulley 9 → Guide pin 111 Sliding plate 1
In the process of step 1, the plate 11 is moved (slided) by a prescribed stroke as shown in FIG.
A release means (not shown) is interlocked with the so-called operating device (not shown) that holds the operating device (e.g.) and releases the lock (held state) of the operating device in conjunction with the sliding movement of the sliding plate 11. Then, at the final stage of the sliding operation process of the sliding plate 11, the lock of the operating device is released and various modes of operation are brought to the 5-top state.

The reason why the tip of the shaft 7N42 in the figure is so long as to be close to the follower plate 10 is that when 121 comes into contact with the follower plate 101, a load is applied to the sliding plate 11 and the follower plate 10 is prevented from escaping. This is to ensure a specified stroke.

On the other hand, a motor switch (not shown) is linked to the various mode operating devices (not shown), and the motor switch is naturally turned off when the operating device is unlocked.
condition and the power is cut off.

However, as is well known, the flywheel 21 has inertial energy, and this energy causes the flywheel 21 to continue rotating several rotations even after the power is cut off.

However, the drive worm 8 and the worm cam wheel 1
2 also rotates somewhat, and the radial protrusion 121 of the worm cam wheel 12 and the follower plate 10
As a result, the sliding plate 11 holding the guide pulley 9 and the following plate 10 is returned to its original state by the sliding grate spring 18 (
The device returns to the state before sliding, thus completing a series of operations and forming an automatic operation stop device.

The above operation was explained when the tape was running from left to right, that is, from the second reel stand IL to the first reel stand 1R, but conversely, from right to left when the tape was running in a fast rewind state, that is, from the first reel Even in the case of tape running from the stand 1R to the second reel stand 1L, the rotation direction of the first reel stand IR is opposite to the above, that is, the rotation direction of the counter belt 5, the counter pulley 6, and the guide pulley 9 is the same. Therefore, the following plate 10 similarly tries to follow the counterclockwise direction, and the tip protrusion 101 of the plate 10 is guided by the right guide surface 122R of the worm cam wheel 12, and the guide pulley 9 It makes a rocking motion while rotating, and the same thing happens after it stops.

In the above embodiment, a counter belt is used as the belt for rotating the guide pulley 9, but the belt is not limited to this, and any other belt may be used as long as it is driven in conjunction with the take-up reel. Of course.

From the above, it is clear that the automatic stop device according to the present invention has the following features.

(1) The entire unit, including the tape running stop detection section, tape winding device drive stop section, and means for preventing malfunction during pause operation, can be compactly made into a unit and can be separated from the tape deck main body.

(2) Therefore, a degree of freedom is obtained in the structure of the first reel stand.

In addition, it is versatile because there are fewer restrictions without reducing the surrounding space.

(3) The structure is relatively simple and can be made cheaper than conventional ones.

(4) Since it is unitized, it is easy to assemble to the main body, increasing the work efficiency of assembly in the final process.

(5) Conventionally, it was impossible to check the operation unless all parts were assembled, but unitization makes it possible to check the operation of the unit itself, making it easier to manage parts.

[Brief explanation of drawings]

1 and 5 are schematic plan views of an embodiment of the present invention;
Fig. 2 is a plan view of a unit according to an embodiment of the present invention, Fig. 3 is a cross-sectional side view along ■-n, Fig. 4 is a side view in the direction of arrows -■, and Figs. 6 and 7 are according to the present invention. FIG. 2 is a partial plan view of one embodiment. Explanation of symbols of main parts, 1...chassis, 1R...
First reel stand, 1L...Second reel stand, 2...
Capstan, 21...Flywheel, 22...
Pulley part, 3... Capstan belt, 4... Motor pulley, 5... Counter belt, 6... Counter pulley, 7... Drive belt, 8... Drive worm, 81. ...Pulley part, 9...Guide pulley,
10...Following plate, 101...Tip protrusion, 1
02... Protrusion, 11... Sliding plate, 111.
...Guide pin, 112...Guide part, 113...
Long hole part, 12... Worm cam wheel, 121...
- Radial protrusion, 122L... (opposing in thrust direction) left guide surface, 122R... (opposing in thrust direction) right guide surface, 13... urging arm, 14... bracket, 141... Long hole, 142... Shaft, 15.
...Following spring, 16...Spring receiver, 17...Cap, 18...Sliding plate spring, 19...Shaft, 20...Spring.

Claims (1)

[Scope of utility model registration request] Automatic stop for use in a tape recorder including a tape take-up reel stand, a tape supply reel stand, a drive means that rotates at a constant speed at least while the tape is running, and a belt transmission mechanism stretched over one of the pulleys. A device that frictionally engages with the outer surface of the annular belt of the belt transmission mechanism and is slidable within a plane containing the belt by being biased substantially perpendicular to the running direction of the belt and toward the outside of the annular belt. a guide pulley, which is rotated by the drive means around an axis perpendicular to both the rotational axis and the sliding direction of the guide pulley, and has a pair of worm cam surfaces on its circumferential surface; A worm cam wheel having a protrusion on a circumferential surface to be held, and a worm cam wheel that is swingable coaxially with the guide boob, frictionally engages with the guide boob, and engages with the worm cam at a side surface of its tip end. The take-up reel stand is driven when a follower plate is engaged with a protrusion provided at the tip of the follower plate and a protrusion of the worm cam wheel, and the follower plate moves in response to rotation of the worm cam wheel. and a forced biasing means for forcibly biasing the follower plate in one direction within its oscillating plane, the forcibly biasing means rotating within the oscillating plane of the follower plate. An automatic stopping device comprising a biasing arm that is movable and that has one end that engages the follower plate and biases the follower plate.