JPH0437307Y2 - - Google Patents

Description

[Detailed Description of the Invention] The mode switching mechanism in the tape recorder of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problems to be solved by the invention E. Means for solving the problems F. Example a Front panel of outer casing [Figs. 1, 3 to 3] Figure 5] b Mode lever [Figures 1 to 6] b-1 Functions of each mode lever b-2 Structure c Lock lever [Figures 1 to 7] c-1 Structure c-2 Mode lever operation using the lock lever Holding in push-in position d Release control lever [Figs. 1 to 7] d-1 Structure e Capstan [Figs. 1, 2, 6, and 7] f Lock release means [Figs. 1 to 7] [Fig. 7] f-1 Electromagnetic drive member [Fig. 1, Fig. 2, Fig. 7]
Figure] f-2 Drive arm [Figure 1, Figure 2, Figure 6
Figures, Figure 7] f-3 Release arm [Figures 1 to 7] f-4 Automatic lock release operation g Operation g-1 Mode formation g-2 Auto reverse g-3 Auto shut-off g-4 AMS Release G Effect of the invention (A. Field of industrial application) The present invention relates to a mode switching mechanism in a new tape recorder. Specifically, for example, a mode switching mechanism in an audio tape recorder or the like, in particular, a plurality of mode levers that form a predetermined mode by being pushed to a predetermined push-in position, and a lock lever that holds the mode levers in the push-in position. The invention also relates to a mode switching mechanism that returns the pressed mode lever to its original position by moving the lock lever in the unlocking direction when stopping the operation of the formed mode, and is an automatic shut-off mechanism. A single mechanism consisting of a relatively small number of members can extremely smoothly switch modes for automatically locating the cue of any selected one of a plurality of recorded contents. The present invention aims to provide a mode switching mechanism for a new tape recorder, which makes it possible to extremely simplify the control means for performing auto-shutoff in a fixed relationship with the tape running direction. be.

(B. Summary of the invention) The present invention includes a lock lever that holds a mode lever in the pressed position, which forms a predetermined mode by being pushed to a predetermined pushed position, and when stopping the operation of the formed mode. By moving the lock lever in the unlocking direction, the pressed mode lever is returned to its original position, and the lock lever for the first mode lever that forms the recording or playback mode, that is, the first lock lever, and the tape A lock lever for the second mode lever, that is, a second lock lever, which forms a mode in which the A lock release means is provided for moving the lock lever in the lock release direction, and the first lock lever can be moved in the lock release direction by the lock release means only when the second mode lever is not pushed in. As a result, the switching of modes for auto-shutoff and automatic cueing of selected recording contents can be performed from a single and relatively small number of components. This mechanism makes it possible to perform the automatic shut-off extremely smoothly, and it also makes it possible to extremely simplify the control means for performing auto-shut-off in a fixed relationship with the tape running direction.

(C. Prior Art) Devices that record using magnetic tape and/or reproduce recorded content usually have predetermined operating modes, such as recording, playback, fast forwarding, rewinding, etc. A mechanism (hereinafter referred to as a "mode switching mechanism") for selectively forming or changing the currently selected mode to another mode is provided.

There have been various types of mode switching mechanisms, but for example, a mode switching mechanism for an audio tape recorder (hereinafter referred to as "ATR") that records and/or plays back audio signals is known as a mode switching mechanism. , comprising a plurality of mode levers that individually form the above-mentioned modes by being pushed to a predetermined pushed position, and a lock lever that holds these mode levers in the pushed position, and stopping the operation of the formed mode. In many cases, the mode lever is moved to the unlocking direction by operating a suitable lock release means, and the mode lever is thereby returned to its original position.

By the way, in a switching mechanism equipped with such a mode lever, lock lever, etc., in order to perform auto-shut-off, that is, control to automatically stop the operation of the ATR when the running tape reaches the tape end, , the lock lever may be configured to move in the unlocking direction when the tape reaches the end state, but if the ATR or the like has an auto-reverse function, that is,
When the tape reaches the tape end from a mode in which the tape is run in a forward direction (hereinafter referred to as "forward run mode"), a mode in which the tape is automatically run in a reverse direction (hereinafter referred to as "reverse run mode"). ) and has a function that continues the operation in the previous mode, automatic shut-off can be performed depending on the selection of the driving mode in which direction. Since the timing at which auto-shut-off should be activated is different, it is necessary to relate the running direction of the tape to the mechanism for performing auto-shut-off by some means.

Also, if the ATR etc. has auto-reverse function even in recording mode, it is necessary to prevent the tape from running endlessly during recording.
An ATR or the like must be configured to automatically shut off at least when the end of the tape is reached from a state in which recording is being performed in reverse running mode.

For this reason, conventional
In ATR, etc., members such as so-called direction sliders and direction cams, which have different positions or operating states depending on the tape running, are associated with the mechanism that performs auto-shutoff. Generally, the lock lever is configured to be moved in the unlocking direction only when the lock lever is at a predetermined position or operating state in the reverse driving mode.

In addition, there is a so-called automatic song selection function, in which the tape is fed by running at high speed between a plurality of songs recorded on one tape cassette, and an appropriate detection means is used to locate the beginning of the selected song. In ATR, etc., which is equipped with a function that automatically plays the song in the normal playback mode when the cue is found (hereinafter referred to as "AMS"), the playback mode is automatically played when the cue is found. It is necessary that the mode lever to be formed is held in its pushed position, and only the mode lever that forms the mode in which the tape is run at high speed is returned to its original position.

Therefore, conventional
In ATR, etc., a mechanism for performing auto-shutoff and a mechanism for performing AMS are provided separately, and by using a plurality of solenoids, each is configured to perform the predetermined operation described above. ing.

(Problem that the invention aims to solve) As mentioned above, the
The mechanism for auto-shutoff in ATRs, etc. was configured to work in conjunction with a direction slider, etc., so it required a large number of parts, and the structure of the mode switching mechanism was extremely multiple. There is a problem that becomes.

Furthermore, in ATRs etc. equipped with an AMS function, an auto-shutoff mechanism and an AMS mechanism must be provided separately, and the structure of the mode switching mechanism becomes even more complex, resulting in various constraints on the layout of the structure. There was a problem that this occurred.

Furthermore, it is necessary to use multiple solenoids, which are themselves effective and consume large amounts of power.
In addition to increasing costs, the power supply section is large and
There was also the problem that it had to be heavy.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the mode switching mechanism in the tape recorder of the present invention has a first mode switching mechanism that is pushed to a predetermined pushing position to form a recording or playback mode. a mode lever, a second mode lever that is pushed to a predetermined position to form a mode in which the tape runs at high speed, and a direction for holding the first mode lever in the pushed position and releasing this holding. a first lock lever that is movable in a direction; and a second lock lever that is arranged side by side in the direction of movement of the first lock lever and that is movable in a direction that holds the second mode lever in its pushed position and releases this holding. and lock release means for moving the second lock lever in the unlocking direction by a predetermined electrical signal, and the second lock lever is always in a state where it can be moved in the unlocking direction by the lock releasing means. and the first lock lever can be moved in the unlocking direction by the lock releasing means only when the second mode lever is not depressed.

Therefore, according to the present invention, when the lock release means is operated while one of the first mode lever and the second mode lever is pushed in, the pushed mode lever returns to its original position. Therefore, if the signal that activates the lock release means is the one when the tape end is detected, then autoshutoff will be performed. Furthermore, if the lock release means is operated while both the first mode lever and the second mode lever are pushed in, only the second mode lever will be returned to its original position. If the electrical signal that activates the means is a detection signal at the time of cueing the recorded content, this will cause the AMS to be canceled. Furthermore, since the first lock lever and the second lock lever are arranged side by side in their moving direction, when one lock lever moves, the other lock lever does not rattle or rub against the other lock lever.

(F. Embodiment) Hereinafter, details of the mode switching mechanism in the tape recorder of the present invention will be explained according to the embodiment shown in the attached drawings.

In the embodiment shown in the drawings, the present invention is applied as a mode switching mechanism 1 in an audio tape recorder equipped with an auto-shutoff function, an AMS function, and an auto-reverse function.

(a. Front panel of outer casing) [Figures 1, 3 to 5] 2 is the front panel of the outer casing of the audio tape recorder, and a mode lever described later is attached to a predetermined part of the front panel 2. Holes 3, 3, 3 are formed in which the provided push buttons are located.

Although not shown in the figure, the front panel 2 includes an AMS control panel that is operated when performing AMS.
button, a running direction switching button that is operated to switch the tape running direction between manual and automatic switching, and a display member that also displays the current tape running direction. .

(b. Mode lever) [Figures 1 to 6] (b-1. Functions of each mode lever) 4, 5, and 6 are mode levers (only the front portions of each are shown in the drawings). ), and these mode levers 4, 5, and 6 are connected to a mechanical chassis 7 and a base chassis 8 located below it.
Among these mode levers, the one located on the leftmost side in FIG. 1 is the play lever,
The lever 5 located on the right side of the play lever 4 is a rewind lever, and the lever 6 located on the rightmost side is a fast forward lever.

The play lever 4 is pushed in alone when performing normal playback, that is, playback when the tape is running at a low speed (hereinafter simply referred to as "playback"), and when recording This is a mode lever that is pushed in at the same time as the recording lever that is not activated, and that sets the playback mode or recording mode by being pushed in a predetermined amount.

The rewind lever 5 is a mode lever that is pushed in to make the tape travel at high speed in the reverse direction, and the fast forward lever 6 is a mode lever that is pushed in to make the tape travel in the forward direction at high speed.

In addition, when the tape is run in the forward direction,
When performing AMS, the fast forward lever 6 is pushed in from the state where the play lever 4 is pushed in, and when performing AMS with the tape running in the reverse direction, the rewind lever 5 is moved from the state where the play lever 4 is pushed in. will be pushed in.

(b-2. Structure) The mode levers 4, 5, and 6 are located slightly apart from each other in the left-right direction, and at least their front portions are formed in a plate shape extending in the front-rear direction, and their front ends Push buttons 4a, 5a and 6a are fixed to.

Reference numerals 9 and 10 indicate substantially rectangular notches formed in the play lever 4 and the rewind lever 5, and lock claws 11 and 12 are formed on the left side edges of these notches 9 and 10, respectively. And the lock claws 11, 12
is formed so that its right side edges 11a, 12a extend obliquely so as to be gradually displaced to the right toward the front end, and its front edges 11b, 12b extend substantially in the left-right direction.

Reference numeral 13 denotes a lock pawl formed on the right side edge of the fast-forwarding lever 6, and the lock pawl 13 also extends diagonally so that the right side edge 13a is gradually displaced to the right as it goes to the front end. Edge 1
3b is formed to extend substantially in the left-right direction.

Note that each of the locking claws 11, 12, and 13 described above is set so that the play lever 4, rewind lever 5, and fast forward lever 6 are in the position shown in FIG.
Say. ), they are formed so that they are located side by side with each other in the left-right direction.

Reference numeral 14 denotes a pressing edge formed in a portion of the rewinding lever 5 that is located a certain distance rearward from the notch 10. It is formed to extend.

Further, reference numeral 15 denotes a pressing protrusion formed in an upright shape from a portion of the left side edge of the fast forwarding lever 6 corresponding to a position slightly forward of the pressing edge 14 formed on the rewinding lever 5.

Each of the mode levers 4, 5, and 6 thus formed has a push button 4 fixed to its front end.
a, 5a, and 6a are inserted into the holes 3, 3, and 3 formed in the front panel 2, and are supported so as to be slidable within a certain range in the front and rear directions, and are A forward moving force is applied by tension springs 16, 16, 16, which are bridged between the front end portion and the front end portion.

In addition, each mode lever 4, 5, and 6 is, for example,
A plurality of elongated holes are formed in each of these mode levers 4, 5, and 6 to extend along the front-rear direction, and
By erecting guide pins from the base chassis 8 and slidably engaging the guide pins with the elongated holes, it is supported so as to be slidable in the front and rear directions within a certain range. .

(c. Lock lever) [Figures 1 to 7] (c-1. Structure) Numerals 17 and 18 are lock levers that are close to the mode levers 4, 5, and 6 from below and are located side by side on the left and right. , of these lock levers 17 and 18, the left one 17 is connected to the play lever 4.
The one on the right side 18 is a second lock lever for locking the rewind lever 5 and the fast forward lever 6 in their pushed positions.

The lock levers 17 and 18 are formed in a plate shape extending in the left and right direction when viewed from the front.
Elongated holes 17a, 17a and 18 are located close to each other in the left-right direction and extend along the left-right direction.
a, 18a are formed, and guide pins 19, 19 and 20, 20 fixed to the outer casing side are slidably engaged with the elongated holes 17a, 17a and 18a, 18a, so that a constant It is supported so that it can move freely in the left and right direction within the range of
A force for moving leftward is applied by a resilient means such as a tension spring (not shown).

Further, the right end of the first lock lever 17 extends from the right side edge of the play lever 4 to a position corresponding to a position slightly to the right, and the right end of the first lock lever 17 extends from the right side edge of the play lever 4 to a position corresponding to a position slightly to the right. An engagement protrusion 21 is erected from a position corresponding to the corner where the edge and the rear edge intersect, and the upper end of the engagement protrusion 21 extends to a position slightly higher than the play lever 4.

Furthermore, a position of the upper edge of the second lock lever 18 corresponding to the corner where the left side edge and rear side edge of the notch 10 formed on the rewind lever 5 intersect, and a position of the lock formed on the fast forward lever 6. Engagement protrusions 22 and 23 are erected from positions corresponding to the rear position of the pawl 13, and the upper end of the right-hand engagement protrusion 23 extends to a slightly higher position than the fast-forwarding lever 6. There is. Further, a pressing portion 24 is formed to protrude upward from the right end of the upper edge of the second lock lever 18.

(c-2. Holding the mode lever in the pushed position by the lock lever) When the play lever 4 is pushed backward from the pushed position, the right side edge 11a of the lock pawl 11 formed on the play lever 4 locks into the first lock lever 17. Since the engaging protrusion 21 is pressed substantially to the right, the first lock lever 17 is moved to the right against the tensile force of a tension spring (not shown). Then, as shown in FIG. 3, the play lever 4 is pushed to a position where the lock pawl 11 is located behind the engagement protrusion 21 (hereinafter referred to as the "push-in position" of the play lever 4). Then, the first lock lever 17 is no longer pressed by the lock pawl 11, and is therefore returned to the left by the tensile force of the tension spring. As a result, the engagement protrusion 21 of the first lock lever 17 is positioned in front of the lock claw 11 of the play lever 4, so that the front edge 11b of the lock claw 11 engages with the engagement protrusion 21 of the first lock lever 17. When engaged, the play lever 4 is held at the pushed-in position.

Also, the rewind lever 5 (or fast forward lever 6)
When pushed backward from the non-pushed position, the right side edge 12a of the lock pawl 12 or 13 formed on it
13a presses the left engagement protrusion 22 (or the right engagement protrusion 23) of the second lock lever 18 approximately to the right, so that the second lock lever 18
is moved to the right against the tensile force of a tension spring (not shown). Then, as shown in FIG. 5 (or FIG. 4), the rewind lever 5 (or fast-forward lever 6) locks its lock claw
When the second lock lever 18 is pushed to a position behind the engagement protrusion 22 or 23 (hereinafter referred to as the "push-in position" for the rewind lever 5 (or fast-forward lever 6)), the second lock lever 18 engages the lock claw. Since it is no longer pressed by 12 or 13, it is returned to the left by the tension spring. As a result, the engagement protrusion 22 or 23 of the second lock lever 18 is positioned in front of the lock pawl 12 or 13 of the rewind lever 5 (or fast forward lever 6), so that the front edge of the lock pawl 12 or 13 is 1
2b or 13b is engaged with the engagement protrusion 22 or 23 of the second lock lever, and the rewind lever 5 (or fast forward lever 6) is held in its depressed position.

The mode levers 4, 5, and 6 held in the push-in position in this manner move the lock lever 1
By moving 7 and 18 to the right, that is, in the unlocking direction, they are returned to the non-pushed position. That is, when the first lock lever 17 is moved to the right from the state in which the play lever 4 is held in the pushed position, the engagement protrusion 21 escapes from the front side of the locked pawl 11, so that the tension of the tension spring 16 is reduced. The force forces it back into the undepressed position. Furthermore, when the second lock lever 18 is moved to the right from the state in which the rewind lever 5 (or the fast forward lever 6) is held in the pushed position, the engaging protrusion 22 or 23 engages the locked pawl 12 or 13. Since it escapes from the front side, it is returned to the non-pushed position by the tensile force of the tension spring 16.

Although not shown, for example, a stop lever is slidably provided on the left side of the play lever 4, and by pushing the stop lever a predetermined amount, the first lock lever 17 is moved in the unlocking direction. While being moved, the second lock lever 1
8 is also moved in the unlocking direction when its left end surface is pressed by the right end surface of the first lock lever 17. That is, manual release of the mode created by pushing the mode levers 4, 5, and 6 is performed by pushing the stop lever.

In addition, lock levers 17 and 18 are automatically operated to perform auto-shutoff and AMS.
movement in the direction of unlocking (hereinafter referred to as "automatic unlocking")
Say. ) is performed directly for the second lock lever 18 by the lock release means described later, and for the first lock lever 17 is performed indirectly by the lock release means via the control lever and the second lock lever 18 described later. It is becoming more common to do so.

(d. Release Control Lever) [Figs. 1 to 7] Reference numeral 25 denotes a release control lever located close to the mode levers 4, 5, and 6 from above. The release control lever 25 is a control member for bringing the first lock lever 17 into a predetermined state, either a state in which it can be automatically released or a state in which it cannot be automatically released, depending on the type of mode formed. The rewind lever 5 and the fast forward lever 6 are used to rotate the rewind lever 5 and the fast forward lever 6.

(d-1. Structure) The release control lever 25 includes a base 25a that has a substantially rectangular shape that has a certain width in the front-rear direction and extends in the left-right direction, and a base 25a that extends rearward from the right end of the rear edge of the base 25a. It consists of a rear arm 25b and a front arm 25c extending toward the right from the front of the right edge of the base 25a. And the rear arm 25b
has a first bent piece 26 bent downward at a substantially right angle at its tip, and a protruding piece formed to protrude substantially diagonally forward to the right from the rear of its right edge. A second bent piece 28 is formed on the tip edge of the tip 27, which is inclined so as to shift to the right as it goes to the rear of the piece 27, and is bent downward at a substantially right angle. Further, the tip of the front arm 25c is bent into a substantially U-shape when viewed from above.

Furthermore, a circular insertion hole 29 is formed at the rear end of the portion near the left edge of the base 25a, and
A spring hooking hole 30 is formed in its front end.

The release control lever 25 is inserted through its insertion hole 29.
The upper part of the engaging protrusion 21 protruding from the first lock lever 17 is inserted into the lock lever 17, thereby being connected to the first lock lever 17 and rotatably supported by the first lock lever 17. Along with
One end of the tension spring 32 is hooked to a spring hook pin 31 erected from the base chassis 8, and the other end of the tension spring 32 is hooked to the spring hook hole 30, thereby being biased with rotational force in the clockwise direction. There is.

Note that while no pressing force is applied to the release control lever 25 to rotate it counterclockwise, the distal end of the front arm 25c of the release control lever 25 is suspended from the stopper 33 raised from the base chassis 8.
By abutting from behind, the position shown in FIGS. 1 and 3 is reached, that is, the tip edge 34a (hereinafter referred to as
It's called a "pressing edge." ) is positioned facing the right engaging protrusion 23 erected from the second lock lever 18 at a predetermined distance (see FIG. 1) from the right side, and the first The bent piece 26 is formed on the pressing edge 14 of the rewinding lever 5.
are located facing each other at a slight distance from the rear,
In addition, the second bent piece 28 is held in a position (hereinafter referred to as the "shaft-off position") where it faces the pressing protrusion 15 raised from the fast-forward lever 6 with a slight distance from the rear. Ru. The above-mentioned distance is approximately equal to or slightly longer than the distance traveled by the second lock lever 18 when the mode levers 4, 5, and 6 are pushed in.

When the second lock lever 18 is moved a predetermined amount in the unlocking direction from the state where the control lever 25 is in the shaft-off position, the engagement protrusion 23 pushes the pressing edge 34a of the release control lever 25 toward the right. Therefore, the release control lever 25 is moved to the right. This causes the first lock lever 17 to be moved in the unlocking direction.

Furthermore, when the rewind lever 5 (or fast-forward lever 6) is pushed from the shaft-off position to the push-in position, the release control lever 25 releases its first folding piece 26 (or second folding piece). Song piece 2
8) is pressed substantially backward by the pressing edge 14 of the rewind lever 5 (or the pressing protrusion 15 of the fast-forwarding lever 6), so the pressing A position where the edge 34a escapes rearward from the position facing the right engagement protrusion 23 erected from the second lock lever 18 (hereinafter referred to as
Say "AMS position". ) will be moved to.

When the release control lever 25 is in the AMS position, the pressing edge 3 of the release control lever 25
4a has escaped to a position where it is not pressed by the engagement protrusion 23 of the second lock lever 18, so even if the second lock lever 18 is moved in the unlocking direction from this state, the release control lever 25 will not be moved. There isn't. That is, in this state, the first
The lock lever 17 will not be automatically released.

Therefore, the first lock lever 17 can be automatically released when the rewind lever 5 or the fast forward lever 6 is not pushed in, and the first lock lever 17 can be automatically released when the rewind lever 5 or the fast forward lever 6 is not pushed in. will not be automatically canceled.

(e. Capstan) [Fig. 1, Fig. 2, Fig. 6,
[FIG. 7] A capstan 35 is positioned such that most of it protrudes upward from the mechanical chassis 7.

Reference numeral 36 denotes a flywheel located close to the lower surface of the mechanical chassis 7, and the flywheel 36 includes a capstan 35 located so as to protrude upward from the center of the upper surface of the flywheel 36, and a capstan 35 located downward from the center of the lower surface of the flywheel 36. The capstan 36 is rotatably supported by a bearing member (not shown) and rotated by a motor (not shown).

Rotating protrusions 38, 38, 38 are formed to protrude horizontally from a portion near the lower end of the boss 37, and these rotating protrusions 38, 38, 3
8 are formed so as to extend substantially radially at a center angle of 120° from each other.

Thus, while the capstan 35 is being rotated, the rotating protrusions 38, 38, 38 are also being rotated.

(f. Lock release means) [Figures 1 to 7] 39 is a predetermined electrical signal, that is, a signal for performing auto-shutoff, and a signal for not pressing the rewind lever 5 or the fast-forward lever 6 from the AMS mode. This lock release means is operated by a signal for returning the lock lever 18 to the lock position (hereinafter referred to as "AMS release"), and when operated, moves the second lock lever 18 in the unlocking direction.

The lock release means 39 comprises an electromagnetic drive member driven by the above-mentioned electrical signal, a drive arm rotated by the electromagnetic drive member, and a release arm rotated by the drive arm.

(f-1. Electromagnetic Drive Member) [FIGS. 1, 2, and 7] Reference numeral 40 denotes an electromagnetic drive member positioned close to the flywheel 36 from below. The electromagnetic drive member 40 includes a casing 41 equipped with a solenoid, an elastic means, etc. (not shown), and the casing 4
1 and an operating rod 42 provided to protrude from the solenoid, and the operating rod 42 is held in the position shown in FIGS. 1 and 7B by the elastic means when the solenoid is not energized. When the solenoid is energized, it is rotated to the position shown in FIG. 7B by the electromagnetic attraction force of the solenoid.

(f-2. Drive arm) [Fig. 1, Fig. 2, Fig. 6
FIG. 7] Reference numeral 43 denotes a drive arm provided at a height approximately midway between the second lock lever 18 and the electromagnetic drive member 40. In the state shown in FIG. 1, the drive arm 43 is formed on a plate extending substantially in the left-right direction, and a portion on the left side from the middle portion thereof is formed in a wedge shape, and the right end portion thereof is formed in a wedge shape. It is rotatably supported by a support shaft 44 (only a part of which is shown in the drawing) fixed to the side, and has an elastic force weaker than the elastic means provided on the electromagnetic drive member 40 (not shown). A counterclockwise rotating force is always applied by the resilient member.

A press pin 45 is erected from a position near the left end of the portion of the upper surface of the drive arm 43 near the front edge, and a press pin 46 is provided downward from an intermediate portion of the portion of the lower surface near the rear edge. The upper end of the pressing pin 45 is brought into contact with the tip of the operating rod 42 of the electromagnetic drive member 40 from substantially behind.

Therefore, the drive arm 43 is connected to the electromagnetic drive member 4
0 is not energized, the pressing pin 45 is brought into contact with the operating rod 42 of the electromagnetic drive member 40, so that its left end is brought into contact with the boss of the flywheel 36, as shown in FIG. A position (hereinafter referred to as
This is called the "initial position." ) will be held.
Furthermore, when the electromagnetic drive member 40 is energized, its operating rod 42 is rotated clockwise, so that the driving arm 43 is pushed by the operating rod 42 with its pressing pin 45 diagonally toward the rear right. This will cause it to rotate clockwise. When the drive arm 43 is rotated in this manner, the left end thereof is positioned to intersect the rotation locus of the rotation protrusions 38, 38, 38, as shown in FIG. 7A. Therefore, when the capstan 35 is rotated in such a state, the left end of the drive arm 43 is directed diagonally rearward to the right by the rotating rotation protrusions 38, 38, 38. Since the ball is kicked by the ball, it is forced to rotate further clockwise.

When the electromagnetic drive member 40 is energized while the capstan 35 is rotating, the drive arm 43 moves from the initial position to the position shown in FIG. 7B (hereinafter referred to as the "rotation completion position"). It will be moved.

(f-3. Release arm) [Figs. 1 to 7] Reference numeral 47 denotes a release arm that is rotated by the drive arm 43. The release arm 47 is located at approximately the middle height between the second lock lever 18 and the drive arm 43, and has a long arm 47a bent in a dogleg shape and a short arm located on the right side of the long arm 47a. The rear end portions of the arms 47b are connected to each other, and the rear end portions are rotatably supported by a support shaft 48 (only a portion of which is shown in the drawing) fixed to the outer casing side. . The front end of the longer arm 47a is positioned so as to contact or approach the pressing portion 24 formed at the right end of the second lock slider 18 from the left side (shown as approaching in the drawing). There is. Further, the lower part of the pressing pin 46 protruding downward from the drive arm 43 is connected to the drive arm 4.
3 is in the initial position, it is located between the longer arm 47a and the shorter arm 47b of the release arm 47, with a slight distance from these two arms.

When the drive arm 43 is moved from the initial position to the rotation completion position, the pressing pin 46 is moved diagonally backward to the right, so that the pressing pin 46 is moved toward the shorter side of the release arm 47. The arm 47b is pressed diagonally backward to the right. As a result, the release arm 47 is rotated counterclockwise, so that its longer arm 47a presses the pressing portion 24 of the second lock lever 18 to the right.

The moving distance of the second lock slider 18 that is moved in this manner is approximately 2 of the above-mentioned distance.
The distance is at least twice that of the first lock lever 17 via the control lever 25 which is in the shaft-off position, so that the first lock lever 17 can be moved by a distance enough to release the lock from the play lever 4. .

(f-4. Automatic lock release operation) Therefore, when the electromagnetic drive member 40 is energized from the state where the release control lever 25 is at the shaft-off position, that is, from the state where only the play lever 4 is held at the push-in position, When the second lock lever 18 is moved in the unlocking direction as described above, the engagement protrusion 23 is moved to the release control lever 2.
5 to the right, the release control lever 25 and the first lock lever 17 are integrally moved in the unlocking direction, as shown in FIG. 7B. As a result, the lock on the play lever 4 by the first lock lever 17 is released, so that the play lever 4 is returned to the non-depressed position. That is, auto-shutoff is performed.

Also, when the release control lever 25 is at the AMS position, that is, whether the rewind lever 5 or the fast forward lever 6 is held in the pushed position, or whether one of them and the play lever 4 is pushed When the electromagnetic drive member 40 is energized from the state where it is held in the position, the second lock lever 18 is moved in the unlocking direction in this case as well.
The lock on the rewind lever 5 or the fast-forward lever 6 by the second lock lever 18 is released, and thereby the rewind lever 5 or the fast-forward lever 6 that has been pushed back is returned to the non-pressed position. become. However, the play lever 4 remains held at the pushed-in position. That is, in this case, the pressing edge 34a of the release control lever 25 has escaped to a position where it is not pressed by the engagement protrusion 23 erected from the second lock lever 18.
Even if the lock lever 18 is moved in the unlocking direction, the release control lever 25 will not be moved. Therefore, the first lock lever 17 is not moved in the unlocking direction, so that the play lever 4 is never unlocked.

Therefore, the rewind lever 5 or the fast forward lever 6
When the lock release means 39 is operated from the state in which the lock lever 18 is pushed in, only the second lock lever 18 is moved in the unlocking direction.

(g. Operation) Therefore, mode formation, auto-shutoff, AMS cancellation, etc., by the audio tape recorder equipped with the mode switching mechanism 1 as described above are performed as follows.

(g-1. Formation of mode) Set play lever 4 or REC (not shown)
When the lever is pushed to the push-in position, a play mode or a record mode (hereinafter collectively referred to as "play mode") is established. That is, when the play lever 4 or the REC lever is pushed in, a magnetic head (not shown) for recording and reproduction comes into contact with the tape of a tape cassette installed in the audio tape recorder, and a pinch roller (not shown) pinches the tape. Then, it is crimped onto the capstan 35. Then, the tape is run at low speed by the capstan 35 which is rotated at a constant speed and the pinch roller, and the magnetic head records on the tape or reproduces the content recorded on the tape.

Furthermore, when the fast forward lever 6 is pushed to the push-in position, a fast forward mode is created in which the tape is run in the forward direction at high speed, and when the rewind lever 5 is pushed in, a rewind mode is created in which the tape is run in the reverse direction at high speed. will be formed.

Furthermore, for example, if the rewind lever 5 is
Alternatively, when the fast forward lever 6 is pushed in, the AMS mode is established. That is, when the mode lever is pushed in in this manner, the magnetic head is retracted slightly from the tape, that is, as far as possible to read the content recorded on the tape, and the pinch roller is moved back. The tape is separated from the capstan 35 and runs at high speed.

Note that a predetermined signal indicating the position of the beginning of each song recorded on the tape is recorded, and this signal is detected via a magnetic head. When a predetermined signal to be detected is detected, the electromagnetic drive member 40 is energized.

(g-2. Auto Reverse) If you move the button for selecting whether to switch the tape running direction manually or automatically to the position where the above switching will be performed automatically, , so-called auto-reverse is performed. That is, when the tape reaches the end of the tape from being run in the forward direction, the tape is now run in the reverse direction, and the operations according to the modes that have been formed up to that point, such as recording operation and playback operation, are resumed. etc. will continue to be carried out.

(g-3. Auto Shut-Off) For example, when the tape reaches the end in the reverse direction while auto-reverse is being performed, the electromagnetic drive member 40 is energized by a signal that detects the tape end.

Therefore, the play mode, that is, the play lever 4
When only this or this and the REC lever are pushed in, the control lever 25 is in the shaft-off position, so the electromagnetic drive member 4 is moved from this state.
When energized to 0, the second lock lever 18, release control lever 25, and first lock lever 17 are all moved in the unlocking direction, as described above. Therefore, the recording or playback operation will be automatically canceled when the end of the tape in the reverse direction is reached.

Note that there are two tape end states, one in the forward direction and one in the reverse direction, but in order to perform auto-shutoff with the tape end in the reverse direction, for example, the current tape running direction must be changed. The electromagnetic drive member 4 is activated under the condition that a predetermined signal of the circuit that operates when the display circuit for displaying is in the reverse direction.
It is conceivable to adopt a circuit configuration in which energization is performed to 0.

(g-4. AMS Cancellation) As described above, when a signal indicating the position of the beginning of a predetermined song is detected in the AMS mode, the electromagnetic drive member 40 is energized based on the signal.

In the AMS mode, either the rewind lever 5 or the fast forward lever 6 is pushed in, so the release control lever 25 is at the AMS position.

Therefore, when the lock release means 39 is operated from this state, the second lock lever 18 is moved in the unlock direction, but the control lever 25 and the first lock lever 18 are moved in the unlock direction.
The lock lever 17 is not moved.

When the predetermined signal is detected from the AMS mode, only the pressed rewind mode 5 or fast forward mode 6 is returned to the non-depressed position, so the tape recorder enters the playback mode and the selected song is The song will be played automatically.

(G. Effect of the invention) As is clear from the above description, the mode switching mechanism in the tape recorder of the invention consists of a first mode lever that, when pushed to a predetermined pushing position, sets the recording or playback mode. a second mode lever that, when pushed to a predetermined position, forms a mode in which the tape runs at high speed; and a second mode lever that holds the first mode lever in its pushed position and is movable in a direction to release this holding. a first lock lever, a second lock lever that is arranged side by side in the direction of movement of the first lock lever and is movable in a direction to hold the second mode lever in its pushed position and release this holding; a lock release means for moving the second lock lever in the unlocking direction by an electrical signal; and a lock release means that is connected to the first lock lever and that moves the second mode lever to the second lock lever when the second mode lever is not pushed in. Thus, the lock is held in a position where it can be moved in the unlocking direction and the second
and a release control lever that is moved to a position where it is not moved by the second lock lever when the mode lever is pushed in.

Therefore, according to the present invention, when the lock release means is operated while one of the first mode lever and the second mode lever is pushed in, the pushed mode lever returns to its original position. Therefore, if the signal that activates the lock release means is the one when the tape end is detected, then autoshutoff will be performed.

Furthermore, if the lock release means is operated while both the first mode lever and the second mode lever are pushed in, only the second mode lever will be returned to its original position. If the electrical signal that activates the canceling means is a detection signal when the recording content is cued, then the AMS will be canceled.

Therefore, the mechanism for performing auto-shutoff and the mechanism for performing AMS can be constructed from a single mechanism made up of a relatively small number of parts, so the structure of the mode switching mechanism can be greatly improved. It can be made simpler, and only one member such as a solenoid is required to be operated by an electrical signal, so the structure can be made simpler in this respect as well. and can keep costs low.

In the case of auto-shutoff, the lock release means is operated based on a signal from a portion of the circuit that is related to the tape running direction. By doing so, it can be performed even with an extremely simple configuration.

Furthermore, by simplifying the structure, there are fewer restrictions on the layout of this type of mode switching mechanism, such as the placement of the mode lever, and it is easier to add mechanisms to prevent erroneous operation. can do. Moreover, since the first lock lever and the second lock lever are arranged side by side in their moving direction, when one lock lever moves, the other lock lever does not rattle or rub against the other lock lever.

[Brief explanation of the drawing]

The drawings show an example of an embodiment in which the mode switching mechanism of the tape recorder of the present invention is applied as a mode switching mechanism of an audio tape recorder. FIG. 1 is a plan view in a stopped state with the mechanical chassis omitted, and FIG. A sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of main parts in play mode, Fig. 4 is a plan view of main parts in fast forward mode, Fig. 5 is a plan view of main parts in AMS mode, Fig. 6 7 is an exploded perspective view of the main parts, and FIG. 7 is a plan view of the main parts sequentially showing the lock release operation by the lock release means from A to B. Explanation of symbols, 1...Mode switching mechanism, 4...First mode lever, 5, 6...Second mode lever, 17...First lock lever, 18...Second
Lock lever, 25...Release control lever, 39
...Lock release means.

Claims (1)

[Claims for Utility Model Registration] A first mode lever that creates a recording or playback mode when pushed to a predetermined position; and a mode that causes the tape to run at high speed when pushed to a predetermined position. a second mode lever that holds the first mode lever in its pushed position and a first mode lever that is movable in a direction to release this holding;
a second lock lever arranged side by side in the moving direction of the first lock lever and movable in a direction to hold the second mode lever in its pushed position and release the holding; and a predetermined electrical signal. a lock release means for moving the second lock lever in the unlocking direction; and a lock release means that is connected to the first lock lever and is locked by the second lock lever when the second mode lever is not pushed in. A release control lever that is held at a position where it can be moved in the release direction and is moved to a position where it is not moved by the second lock lever when the second mode lever is pushed. Mode switching mechanism in a recorder.