JPS6040978Y2 - Tape recorder operation lever movement restriction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control lever movement regulating device for preventing the control lever from switching directly from the fast-forwarding state to the rewinding state or vice versa in a tape recorder with a single-operation lever set.

A tape recorder with a single operating lever, especially a cassette car stereo, is in the performance state (playback state) when the single operating lever is in the center position and protrudes forward (if it is moved back from the center position, it is in the eject state). ), and from this state, by rotating the operating lever to the left or right, it is possible to enter the fast forward or rewind state.

When returning to playing mode from fast forward or rewind mode,
Since an elastic force that causes the operating lever to protrude forward is acting on the operating lever, the operating lever that has been rotated to the center position generally projects forward.

However, when the control lever is operated from an angle, the elastic force prevents the control lever from returning to the front, so the player can directly switch from fast-forward to rewind, or vice versa, without going through the performance state. A problem arises in that the desired part cannot be reproduced.

In order to eliminate the above-mentioned drawbacks, the present invention provides a mechanism that prevents the operating lever in either the fast forward or rewind state from shifting to the other state unless it returns to the playing state. An object of the present invention is to provide an operating lever movement regulating device that prevents direct switching between rewinding states.

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

Figure 1 shows a head stand 10, an operating lever 20, and a chassis 30.
FIG. 2 is an exploded perspective view showing the main parts of.

The head stand 10 has a magnetic head 11 mounted on its rear end, and has two pins 12 and 13 implanted in its lower surface.

Reference numeral 14 denotes a pair of holes for passing through a reel shaft (not shown).

The pin 2 passes through a round hole 21 at the base end of the operating lever 20 and is fitted into a long oblong hole 31 at the front and rear of the chassis 30.

Further, the pin 13 passes through an arcuate hole 22 extending left and right at the center of the body of the operating lever 20, and is fitted into a straight portion 32a of a substantially arrow-shaped cam groove 32 of the chassis 30.

The cam groove 32 consists of a straight part 32a and a substantially triangular head 32b connected to the straight part 32a, and the operating lever 2 is attached to the head 32b.
The pin 23 implanted on the lower surface of the body of the 0 is inserted.

The positions where the pin 23 presses against the front end 32C1 left end 32d and right end 32e of the head 32b of the cam groove 32 are in the playing state, fast forwarding state, and rewinding state (described later).
.

A pair of coil springs 16 are hung between the locking holes 15 on both sides of the head stand 10 and the locking pieces 33 at the front end of the chassis 30, and the head stand 10 is constantly subjected to elastic force forward (in the direction of arrow F).

34 is a pair of holes for passing through a reel shaft (not shown).

The operating lever 20 has a pin 12 inserted into the oval hole 3 of the chassis 30.
1 and within the range in which the pin 13 can move within the linear portion 32a of the cam groove 32 of the chassis 31, it is movable forward F and backward B, and the state displaced to the rear B is the ejected state.

At this time, the pin 23 on the bottom surface of the operating lever 20 also has a straight portion 32a.
Partially entered.

In the performance state in which the operating lever 20 is displaced forward F at this center position, the pin 23 abuts against the front end 32c of the cam groove 32, but when the operating lever 20 is rotated to the left from this state, the pin 23 moves toward the cam groove 32. The left end 32 along the head 32b of the groove 32
It reaches point d and is locked (the locking mechanism is omitted)
.

This state is a fast forward state, but if the operating lever 20 is rotated to the right R from the playing state, the pin 23 reaches the right end 32d along the head 32b of the cam groove 32 and is locked.

This state is the rewind state.

In the fast forward or rewind state, the pin 23 moves slightly backward B, so the head stand 10 moves back by that amount, separating the magnetic head 11 from the magnetic tape (not shown).

The above-mentioned cam groove 32 is formed by the elasticity of the spring 16.
When the pin 23 moves from the left end 32d to the right R, the front end 3
2c, and conversely, when moving leftward from the right end 32e, it is stopped at the front end 32c, but the operating lever 20 is rotated while applying a force toward the rear B that resists the elasticity of the spring 16. Then, the pin 23 can move between the left end 32d and the right end 32e without passing through the front end 32c.

This is the direct switching between the fast forward and rewind states described above.

In order to prevent such direct switching, the present invention incorporates an operating lever movement regulating device 40 shown in FIG. 2.

FIG. 2 is an exploded perspective view showing the main parts of the idler mounting base 50, the sliding piece 60, and the board 70.

The idler mounting base 50 has an oblong hole 5 extending back and forth in the center.
1, left and right idlers 53 and 54 pivotally fixed to the upper surface of the base 52, and a pair of leaf springs 55a and 55b whose base ends are fixed to the center of the body of the base 52. The stand 52 is located on the lower surface of the bottom 61 of the sliding piece 60 and
1. Insert the pin 62 implanted on the lower surface.

The leaf springs 55 a and 55 b are located on the upper surface of the bottom 61 of the sliding piece 60 and clamp the small wall 63 from both sides.

Further, a coil spring 57 is engaged between a circular hole 56 at the base of the leaf spring and a locking piece 64 cut and raised from the bottom 61, thereby biasing the entire mounting base 50 forward.

The bottom portion 31 of the sliding piece 60 is approximately T-shaped, and a pair of oval holes 65a and 65b extending left and right are bored in both wing portions.

The substrate 70 is attached to the lower surface of the chassis 30 in FIG. 1 at a predetermined interval, and a sliding piece 60 is interposed therebetween.

A pair of pins 71a are implanted on the upper surface of the substrate 70.
, 71b to the oval holes 65 a, 65 b of the sliding piece 60
The sliding piece 60 is supported so as to be slidable left and right.

A notch 67 for engagement is provided in the ceiling 66 of the sliding piece 60, into which the pin 23 of the operating lever 20 passing through the cam groove 32 shown in FIG. 1 is fitted.

Therefore, the sliding plate 60 moves in parallel to the left or right R as the operating lever 20 rotates to the left or right R, and moves the left idler 53 or right idler 54 in the same direction. let

The operating lever movement regulating device 40 is located at the bottom 61 of the sliding piece 60.
It consists of a projection 41 raised from the rear end of the right wing, a pair of projections 42a and 42b raised from the front end of the base plate 70, a stopper 43 as a separate member, and a spring 44 with both ends expanded.

The pin 71a of the substrate 70 passes through the oblong hole 65a of the sliding piece 60, and then fits into the winding portion 44a of the spring 44 and the oblong hole 43a extending back and forth in the stopper 43.

Both ends 44b and 44c of the spring 44 are stoppers 43
The stopper 43 collides with the bent portions 43b and 43c on both sides of the stopper 43.
An elastic force is applied to the rear (in the direction of the protrusion 41).

A front end protrusion 43d raised from the front end of the stopper 43 abuts against the front end 10a of the head stand 10 in FIG.
It is located between the protrusions 42 a and 42 b of the substrate 70 .

Further, the rear end protrusion 4 extends outward from the rear end of the stopper 43.
3e is located forward of the protrusion 41 of the sliding piece 60 when the stopper 43 is displaced forward F as the head stand 10 moves, but when the head stand 10 moves backward B during rewinding or fast forwarding. When moving, the front end of the oblong hole 43a is connected to the pin 71.
It protrudes to the left or right side of the protrusion 41 until it collides with a.

The operation of the operating lever movement regulating device 40 having the above configuration will be explained with reference to state diagrams shown in FIGS. 3 to 5.

FIG. 3 shows a performance state in which the operating lever 10 is moved forward F at the center position, and the left reel shaft 81 rotates counterclockwise.

82 is a right reel shaft, 83 is a left flywheel, and 84 is a right flywheel.

In this state, the head stand 10 is attached to the spring 16 (Fig. 1).
Since the stopper 43 is moved forward by the elasticity of the slider 60, the stopper 43 is also displaced forward F, and the rear end protrusion 43e is positioned in front of the protrusion 41 of the sliding piece 60.

Therefore, it is possible to rotate the operating lever 20 leftward or rightward R to move the sliding piece 60 in parallel to the left or right.

FIG. 4 shows the sliding plate 60 when the operating lever 20 is rotated to the left.
This is a fast-forwarding state in which the idler mounting base 50 is displaced to the left, and the left reel shaft 81, left idler 53, and flywheels 83 and 84 rotate in the direction of the arrow shown in the figure.

Further, FIG. 5 shows a rewinding state in which the operating lever 20 is rotated to the right R and the sliding piece 60 and the idler mounting base 50 are displaced to the right. .84 rotates in the direction of the arrow shown.

In these conditions, the sliding piece 60 is displaced from the center position and the head stand 10 is slightly retracted, so the stopper 4
3 is displaced backward B by the elastic force of the spring 44.

Therefore, in the case of FIG. 4, the rear end protrusion 43e is located on the right side of the protrusion 41, so if the sliding piece 60 tries to move to the right R, the protrusion 41 and the rear protrusion 43e collide with each other, and the front end protrusion 43d and the left protrusion 4 of the board 70
2b collides.

That is, since the sliding piece 60 is prevented from moving to the right R, the rotation of the operating lever 20 in the same direction is prohibited within a certain range.

This is the same in FIG. 5, except that the positional relationship between the protrusion 41 and the rear end protrusion 43e is reversed, and if you try to move the sliding piece 60 to the left, the front end protrusion 43d It collides with the right protrusion 42a of the base plate 70 and prohibits rotation of the operating lever 20 in the same direction within a certain range.

The above-mentioned restrictions on the rotation range of the operating lever 20 are intended to prevent malfunctions such as direct switching between the two states of rewind and fast forward, so at least the rotation angle for returning to the central position, which is the playing state, is permissible. must be done.

This depends on the distance between the protrusions 42a and 42b of the board 70, but in this way, the fast forward and rewind states can be unlocked during the rotation operation to return the operating lever 20 to the center position. Therefore, the state shown in FIG. 3 is always restored from the state shown in FIG. 4 or 5.

As described above, according to the present invention, it is possible to select the performance state, fast forward state, and rewind state with a single operating lever as in the past, and since direct switching between the fast forward and rewind states is prevented, it is possible to select the desired state. This has the advantage that the performance can be reliably started from the recording position where the tape is being recorded, and that damage to the tape due to sudden reversal of running can be prevented.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams showing one embodiment of the present invention.
The figure is an exploded perspective view of the main parts of the head stand, operating lever and chassis, Figure 2 is an exploded perspective view of the main parts of the operating lever movement regulating device, idler mounting base, sliding piece and board, and Figure 3 shows the playing state. FIG. 4 is a plan view of the main part showing the fast forward state, and FIG. 5 is a plan view of the main part showing the rewind state. 10...Head stand, 11...Magnetic head, 16...Spring, 20...Operation lever, 23...Pin, 30... ...Chassis, 32...Cam groove, 40...Operation lever movement restriction device, 41...Protrusion of sliding piece, 42a, 42b... ...Protrusion of the board, 43.
...Stopper, 43a...Oval hole, 43
d...Front end protrusion, 43e...Rear end protrusion, 44...Spring, 53, 54...
...Idler, 60...Sliding piece, 67...
...Notch part (engaging part), 70... Board, 71
a...Pin.

Claims (1)

[Claims for Utility Model Registration] A head stand on which a magnetic head is mounted, an operating lever whose base end is pivoted on the lower surface of the head stand, a chassis that supports the head stand so that it can slide back and forth, A spring that biases the head stand forward, a substantially arrow-shaped cam groove provided on the chassis and engaged with a pin implanted on the underside of the body of the operating lever, and a cam groove of the operating lever that passes through the cam groove. A sliding piece having a retaining portion that engages with a pin and capable of displacing the left and right idlers to the left or right, and a substrate supporting the sliding piece so as to be slidable left and right on the lower surface of the chassis, In a tape recorder with one operating lever, in which the sliding piece moves to the left or right by rotating the operating lever to the left or right from a performance state in which the operating lever returns to the front, resulting in a fast forward or rewind state. , a long oblong hole at the front and back into which a pin implanted in the substrate is inserted; a rear end protrusion that engages with a protrusion raised from the sliding piece; A stopper having a front end protrusion located between a pair of left and right protrusions raised from the top, and a spring biasing the stopper rearward are provided, and in the playing state, the stopper is displaced forward by the head stand. The engagement between the rear end protrusion and the protrusion of the sliding piece is released, and the operating lever can be rotated to the left or right, and the fast forwarding or rewinding when the operating lever is rotated to the left or right. When attempting to rotate from the playing state to the opposite direction without passing through the playing state, the rear end protrusion of the stopper is brought into contact with the protrusion of the sliding piece, and the front end protrusion of the stopper is brought into contact with the left or right protrusion of the board. A control lever movement control mechanism when releasing fast forward/rewind in a tape recorder equipped with one operating lever, characterized in that the operating lever and the sliding piece are prevented from moving within a predetermined range by abutting against each other. Device.