JPH0411238Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fast forward/fast rewind automatic stop mechanism for a tape recorder that reliably performs fast forward/fast rewind automatic stopping operations at the end of a tape.

Conventionally, various devices have been proposed that automatically stop tapes by detecting the end of the tape. Proposals have also been made to use a common automatic stop device during recording and playback, or to use an independent automatic stop device for automatic fast forward and fast rewind stops. However, in the present invention, a simple mechanism is added to the independent fast forward/fast rewind operation mechanism to create a tape recorder that operates reliably by eliminating malfunctions due to abnormal tape tension when starting fast forward or fast rewinding from the tape running state. The purpose of the present invention is to propose a fast forward/fast rewind automatic stop mechanism.

The features of the present invention include a lever means supported movably in the front and rear and left and right directions, an idler wheel rotatably supported by the lever means and driven by a drive source, and a reel stand that selectively supplies the idler wheel. Alternatively, a cam lever connected to the take-up reel stand, a cam for pulling back the cam lever, a fast rewind lever or a fast forward lever for pushing out the cam lever, and a locking plate for keeping these levers set. a release member provided on the lever means and abutting on the locking plate; when the fast rewind lever or the fast forward lever is set, the idler is engaged with the cam and the cam lever until the abnormal tension in the tape disappears. In addition to delaying the connection of the wheels, when the supply reel stand or the take-up reel stand is stopped, the locking plate is moved by the release member by the forward and backward movement of the idler wheel to set the fast rewind lever or the fast forward lever. The reason is that we decided to release the .

The present invention will be explained below with reference to illustrated embodiments. As shown in FIGS. 1 to 3, the tape recorder has parts arranged on both the front and back surfaces of the chassis 1, which has a high surface at the rear edge and a low surface at the middle, and penetrating the chassis 1. There are reel stands 2 and 3 on the rear upper surface for supplying and winding the cassette tape.
A claw portion 2a that engages with the cassette reel is provided at the upper part of each of the claws 2a,
3a, and as shown in FIGS. 2 and 3, each has gear portions 2b and 3b at the lower part thereof which receive rotation transmission. A two-stage gear 3c is rotatably fitted in the middle of the reel stand 3, and a spring 3 is connected to the gear 3b via a friction material 3d such as felt.
The reel stand 3 is pressed together by the reel e and rotated as a unit under a certain constant torque.

As shown in FIG. 1, a head board 4 is provided on the upper surface of the chassis 1 and is prevented from coming off upward by a plurality of tongues 1a formed integrally with the chassis. The head is placed on the head so that it can slide back and forth on the chassis 1 and is moved back toward the front by a spring 5. Further, a protrusion 4a extending downward and penetrating the chassis 1 is formed on the head base plate 4 so as to receive the forward force of the push-up lever 6 shown in FIGS. 2 and 4.

On the right side of the head board, a capstan shaft 7 passes through the chassis 1 and protrudes from the top, and feeds the tape at a constant speed with a pinch roller 8. The flywheel 7a is fixed, and is rotated at a constant speed by receiving rotation from a motor (not shown). The gear 7 is located in the center of the flywheel 7a.
b is fixed and the assist gear 9 is fixed as shown in Fig. 4.
The gears 9a are arranged so as to be engaged with each other.

The pinch roller 8 is rotatably attached to an arm 11 that is rotatable around a shaft 10 on the chassis 1. Further, the arm 11 is urged forward by a spring 12, and one end of the spring is connected to the head board 4.

The assist gear 9 is integrally formed with a gear 9a on the outer periphery, two central cam portions 9b, 9c, and two locking pieces 9d, 9e on the outside of the cam portion 9b.
The gear 9a has one toothless part 9f, and the cam part 9
b is the first cam surface 9 that becomes further away from the center as it rotates;
g and a second cam surface 9h that is closer to the center, the two locking pieces 9d and 9e are arranged so as to collide with one end 13a of the rotating lever 13, and the other end of the rotating lever 13 13b appears on the upper surface of the chassis 1, as shown in FIG. 1, and is opposed to the tips 14a and 15a of the recording lever 14 and the playback lever 15, respectively.

Further, a spring 16 is pressed against the other cam portion 9c to try to rotate the assist gear 9 clockwise in FIG. 4.

An assist lever 17 is arranged on the chassis 1 on the left side of the assist gear 9, the tip 17a is opposed to the cam part 9b, and the hollow shaft 1 of the assist lever 17
7b is rotatably supported on a shaft, and a spring 18 is wound around the outer periphery of the hollow shaft 17b on the lower surface, and both ends are hooked to hooks 17c and 17d of the assist lever 17, respectively, and a protrusion 17e is attached to the hook 17d. is formed.

The push-up lever 6 is rotatably supported by a shaft on the lower surface of the chassis 1, and a protruding piece 6a is provided on the upper surface as shown in FIG. 4 so that the protrusion 4a of the head board 4 can be pushed forward. It's getting old. The push-up lever 6 has two protrusions 6b,
6c is formed, and the protrusion 6b is the assist lever 1.
When facing the protruding portion 17e of No. 7, one end of the protruding spring 18 is brought into contact with the protruding portion 17e.

Further, in front of the head board 4 on the upper surface of the chassis 1, there is a lever 33 rotated by a motor (not shown).
An idler wheel 19 and a first idler 20 of the drive source are rotatably supported at 35, and the first idler 20 is rotatably attached to an arm 21. The arm 21 is rotatably supported and receives force from a spring 22 to rotate counterclockwise.The arm 21 is provided with a protrusion 21a that engages with the edge 4b of the front protrusion of the head board 4 to rotate the arm 21 counterclockwise. When the rotation is blocked and the head board 4 moves forward, the protrusion 21a of the arm 21
falls into a recess 4c provided slightly near the base of the edge 4b of the head board protrusion, so the arm rotates counterclockwise, and the first idler 20 connects the small gear of the idler wheel 19 and the take-up reel stand. It is provided so as to mesh with the larger one of the two-stage gears 3c.

In FIG. 5, the protrusion 23a or 23b of the switch lever 23 in FIG. 4 is pushed by the slope 14b of the recording lever 14 or the wall 15b of the lower recess of the playback lever 15, and the switch 24 is closed. The switch lever 23 is further provided with a protrusion 23c, so that when the fast rewind lever 25 and the fast forward lever 26 are pushed in through the sliding lever 41, the switch 24 is closed, and a motor (not shown) is rotated to rotate the head board. 4 is configured to be moved back and forth.

Next, the recording lever 14, playback lever 15, stop lever 43, other fast rewind lever 25, fast forward lever 26, etc. are moved along the lower surface of the high front side of the chassis 1 as shown in FIGS. 1 to 3. The levers are inserted into horizontally elongated holes so that they can be slid back and forth as shown in FIG. 5, and each lever is biased by a plurality of springs 27 so as to be retracted toward the front.

As shown in FIGS. 2, 3, and 5, a first locking plate 28 is arranged in a recess between the front and rear of the upper surface of the chassis 1 so as to be able to slide left and right on the upper surface of the chassis 1. A protruding part 28a that engages with the engaging part 15c of the regeneration lever 15 is provided on the one side, and a protruding part 28b that comes into contact with the engaging part 43a of the stop lever 43 is provided on the right side. The first locking plate 28 is a spring 29
Therefore, when the regeneration lever 15 is pushed in, it is held in that position by the engagement between the protruding part 28b and the locking part 15c, and when the stop lever 43 is pushed in, it moves back to the left and regenerates. The holding of the lever 15 is released.

A second locking plate 30 is arranged above the first locking plate 28 as shown in FIGS. 1 and 3.
is rotatably supported on the edge of the upper surface of the chassis 1 about the protrusions 30a at both ends.
It is biased clockwise in the figure.

As shown in FIGS. 3 and 5, each operating lever for recording, fast rewinding, and fast forwarding is provided with engaging recesses 14c, 25a, and 26a that engage with the second locking plate 30. As shown in FIG. 1, three protrusions 30b are formed on the lower surface of the front edge of the second locking plate 30 corresponding to the second locking plate 30, so that the levers for each operation are held when pressed. The left protrusion 2 of the first locking plate 28
A sloped protrusion 30c is formed at the position of the second locking plate 30 corresponding to 8d, and is configured to push up the second locking plate 30 when the first locking plate 28 moves to the left. It is configured so that it can be released by pushing the lever 43, and furthermore, the second locking plate 30
has a concave cam surface 3 on the bottom surface as shown in Figures 1 and 3.
A protruding piece 30e having a diameter of 0d is formed.

Therefore, when any one of the recording, fast rewind, and fast forward levers is pushed in, the second locking plate 30 is once rotated counterclockwise, so that the previously held lever is released.

The idler wheel 19 is composed of two stages of upper and lower gears as shown in FIGS. 1 and 3, and further faces a second idler 32 that is meshed with the gear 3b of the take-up reel stand 3, and is connected to a motor (not shown). As shown in FIGS. 3 to 5, the lever 33 is attached to a lever 33 so as to be rotatable together with the pulley 19a, which receives rotation from the chassis 1 with a belt. It is rotatably supported by another lever 35. Further, one end of the lever 33 extends, and an engaging shaft 33a is integrally molded at the end. The lever 35 is normally held at the center position from front to back by a spring 36 shown in FIG. 4 attached to the chassis 1.

The shaft 33a at the end of the lever 33 is engaged with a long hole 37a of a cam lever 37, as shown in FIGS. There is a shaft portion 37b extending downward through the shaft, which is rotatable in both left and right directions, and also slidable in the front and rear directions. It is held at the center position on the left and right sides by springs 38, 38. The cam lever 37 is provided with extensions 37c and 37d in the left-right direction of the shaft 37b, and are opposed to the tips 25b and 26b of the fast rewind lever 25 and the fast forward lever 26, respectively.

Below the shaft portion 37b of the cam lever 37 is a cam gear 39 shown in FIG. 4, which is also connected to the outer gear 3.
9a has a toothless portion 39b, and a cam surface 39c that gradually increases in the rotation direction and a cam surface 39d that decreases in the rotation direction are formed at the center, and the shaft portion 3 is formed on the outside thereof.
The cam surface 39e approaches the center where 7b is pulled back to the front side, the cam surface 39f separates from the cam surface 39e, and the cam surface 39
A locking portion 39g and a locking piece 39h are respectively formed at the end of the cam gear 39, and one end of a spring 40 is applied to the center cam surfaces 39c and 39d, and the cam gear 39 is urged to rotate clockwise. The other end is engaged with a sliding lever 41.

The sliding lever 41 is biased in the left-right direction by a spring 40 and is provided so as to be slidable in the left-right direction.
1b is provided to lock the locking portion 3 of the cam gear 39.
9g and the locking piece 39h, and the upper surface of the sliding lever 41 is provided with protrusions 41c, 41d, etc., as shown in FIG. The protrusion 23c of the switch lever 23 is in contact with the slope 41e of the left protrusion of the sliding lever 41.

Support levers 33, 3 for the idler wheel 19
5. To explain the operation of the cam lever 37, cam gear 39, and sliding lever 41, when the fast rewind or fast forward lever is pushed in, the cam lever 37 moves with its tip 25b or 26b.
When the extension part 37c or 37d of the switch lever 2 is pushed, the sliding lever 41 is moved to the right.
3 is rotated counterclockwise to close the switch 24, and further, the protrusion 41b is disengaged from the locking portion 39g, and the cam gear 39 is rotated clockwise by the spring 40.
Since the gear 39 is engaged with the gear 7b of the flywheel 7a, rotation continues and the locking piece 39
h comes to the position of the protrusion 41b and is stopped.

During this time, the left and right rotation of the cam lever 37 is held by the springs 38, 38 so that it faces the center, so initially it slides forward in that direction and the shaft 33a at the end of the lever 33 is not moved. When the cam rotates and the shaft portion 37b of the cam lever 37 engages with the cam surface 39e of the cam gear 39 and is pulled back toward you, the cam lever 37 now rotates in the right or left direction against the spring 38. Then, the shaft 33a at the end of the lever 33 moves to the right or left, so the idler wheel 19 moves to the left or right, and the larger gear engages with the gear 2b of the supply reel stand 2 or the second idler 32. Then, the supply reel stand 2 or the take-up reel stand 3 is rotated, respectively. As shown in FIGS. 3 to 5, a release member 42 is connected to the lever 35 and is provided so as to be able to slide toward the front on the chassis. It faces the concave cam surface 30d of the protruding piece 30e of the locking plate 30.

The operation of the automatic stop mechanism during fast forward operation is as follows:
When the fast-forward lever 26 is pushed in, the cam lever 37 is moved forward as described above, and then the cam gear 39 rotates and the cam lever 37 is pulled back so that the drive gear 19 is engaged with the second idler 32 and the tape is taken up and transferred to the reel stand 3. Even if the rotation of the reel stand 3 is stopped at the end of the tape, the idler wheel 19 tries to continue rotating counterclockwise, but the idler wheel 19 tries to continue rotating counterclockwise. Since the second idler 32 is stopped, a force is generated that tends to move the idler wheel 19 toward the front side as a whole, and the idler wheel 19 is moved toward the front side against the spring 36 that keeps it in the center position.

This movement causes the release member 42 to slide forward on the chassis, push up the second locking plate 30, release the fast-forwarding lever 26, and move the slide lever 4
1 is slid to the left to open the switch 24.

Next, at the end of fast rewinding, the idler wheel 19 is engaged with the gear 2b of the reel stand 2, and a force is generated that moves the idler wheel 19 forward against the gear 2b that has stopped at the end of the tape, causing the release member to move. 42 is caused to move forward, the second locking plate 30 is rotated counterclockwise, and the fast rewind lever is released.

Therefore, the idler wheel 19 of the drive source is rotatably supported by the levers 33 and 35 which are supported so as to be rotatable in the front and rear and left and right directions, and the release member 42 is connected to the lever 35 to lock the release member in the second locking state. When the supply reel stand 2 or the take-up reel stand 3 to which the idler wheel is connected at the end of the tape is brought into contact with the plate 30, the idler wheel is moved toward this side or forward, and the second locking plate is released using the release member. A simple moving configuration ensures automatic stopping of fast forwarding and fast rewinding, and the automatic stopping mechanism is easy to assemble.

Further, when the fast rewind lever 25 or the fast forward lever 26 is pushed in with the head board 4 being advanced by the playback lever 15, the push of the playback lever 15 rotates the assist gear 9 as described above, and the assist lever 17 is rotated. ,
The head board 4 is advanced via the push-up lever 6, and the first idler 20 is moved forward by the idler wheel 1.
9 is engaged with the gear 3c, and then when the fast-forwarding lever 26 is pushed in, the cam gear 39 is rotated as described above and the idler wheel 19 is engaged with the second idler 32. However, before that, the cam surface 39c is opposed to the other protrusion 6c of the push lever 6 and pushes back the push lever 6, the head board is moved back slightly, and the pinch roller 8
is separated from the capstan shaft 7, the protrusion 21a of the arm 21 is pushed out from the recess 4c of the head board 4 in FIG. 1, and the first idler 20 is disengaged from the gear 3c. It is turned off, and all effects given to the tape in the playback state are canceled. After eliminating the cause of abnormal tension in the tape in this manner, the reel stand is rotated quickly through the rotation transmission path of the second idler 32. The stopping operation is similar to the other operations already mentioned.

Since the present invention is constructed as described above, by timing the connection of the cam, cam lever, idler wheel, and supply reel stand or take-up reel stand, unnecessary automatic stops due to abnormal tape tension can be eliminated.
The idler wheel of the drive source is rotatably supported by a lever supported so as to be rotatable in the front and rear and left and right directions, and a release member is connected to one of the levers, and the release member is brought into contact with a second locking plate, A simple structure in which the supply reel stand or take-up reel stand to which the idler wheel is connected at the end of the tape is stopped, the idler wheel is moved toward this side or the front, and the second locking plate is moved by the release member, ensuring fast forwarding. The tape recorder's fast-forwarding and fast-rewind system has excellent practical effects, such as automatic stopping of fast-rewind and easy assembly of the automatic stop mechanism.
An early rewind automatic stop mechanism can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a plan view of the tape recorder, Fig. 2 is a sectional side view of the chassis seen from the right side, and Fig. 3 is a side view of the chassis seen from the middle to the left side. A cross-sectional side view, and Figure 4 is a partially cross-sectional plan view with the high surfaces of the head board and chassis removed.
FIG. 5 is a partially sectional plan view below FIG. 4. 2... Supply reel stand, 3... Take-up reel stand, 19... Idler wheel, 26... Fast forward lever, 25... Fast rewind lever, 28, 30...
Locking plate, 33, 35... lever, 42... release member.

Claims (1)

[Scope of utility model registration request] A lever means supported so as to be movable back and forth and left and right, an idler wheel rotatably supported by the lever means and driven by a drive source, and the idler wheel selectively moved to a supply reel stand or a take-up reel stand. a cam lever connected to the cam lever, a cam for pulling back the cam lever, a fast rewind lever and a fast forward lever for pushing out the cam lever, and a locking plate that maintains the set state of the fast rewind lever and the fast forward lever; a release member provided on the lever means and abutting on the locking plate; when the fast rewind lever or the fast forward lever is set, the idler is engaged with the cam and the cam lever until the abnormal tension in the tape disappears. A tape recorder characterized in that the connection of the wheels is delayed and the release member is moved when the supply reel stand or the take-up reel stand is stopped to release the set state of the fast rewind lever or the fast forward lever. Fast forward/fast rewind automatic stop mechanism.