JPH0581978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching mechanism for setting various operation modes of a tape recorder, and particularly to a switching mechanism suitable for small cassette tapes.

[Background technology and its problems]

Normally, tape recorders have normal playback (FWD) and fast forward (F/FWD) operating modes.
F), the rewind (REW) function can be set, but there are also some that are equipped with a reciprocating playback head so that reverse playback (REV) can be performed.

However, as the operating modes become more diverse, the tape drive mechanism becomes more complex, and the switching mechanism that controls the drive mechanism also becomes more complex and larger.

In particular, when the switching mechanism is electrically controlled by the feather touch, the switching mechanism is directly driven by a large plunger, which poses a problem of increased power consumption.

In addition, if two small control motors are used to drive the switching mechanism instead of a plunger, it is possible to achieve a certain degree of downsizing and power saving, but the gear meshing action associated with switching is slow, and the The problem is gear noise caused by collision. Therefore, there is a drawback that it is necessary to perform switching control after temporarily stopping the capstan drive motor.

[Purpose of the invention]

This invention was made in view of the above circumstances, and uses a single small control motor as the switching mechanism to save power and to switch from the previous operation mode to the next specified operation mode. In this case, the biasing force stored in a spring or the like is used to instantly switch gears, thereby preventing gear noise and making the whole gear more compact.

[Summary of the invention]

In order to achieve the above object, the switching mechanism of the tape recorder of the present invention includes two slide levers that are biased to clamp a cam that stops at a rotation angle position corresponding to a designated operation mode. The switching mechanism is composed of a switching plate whose position is regulated by the slide lever, and a locking plate that locks the switching plate while the cam is rotating. be. Since the engagement of the transmission gear is set to various operation modes depending on the position of the switching plate, switching control is performed only by a small driving force that rotates only the cam, and the transmission mechanism Switching is effected by instantaneously moving the switching plate by the retraction force stored in the slide lever when the locking plate is released.

Therefore, the power consumption of the switching mechanism can be reduced, gear noise can be prevented, and the overall structure can be made more compact.

〔Example〕

FIG. 1 shows an embodiment of the switching mechanism of the tape recorder of the present invention, in which 1 is a cam, 2 is a two-stage cam gear that rotates with the cam 1, and a switching gear 3 switches the switch as described later. The cam 1 is configured to rotate by a predetermined angle when pressed by the gear lever 3a. 4 and 5 are first and second slide levers that clamp the cam 1;
The slide levers 4 and 5 are urged toward each other by a spring 6, and can be slid in the left-right direction by guide pins 7 and 8 embedded in the deck board. Reference numeral 9 denotes a switching plate having an opening guided by guide pins 4a and 5a installed in the first and second slide levers 4 and 5, and simultaneously clamped by protrusions 4b and 5b. It is worn. This switching plate 9 has a concave and convex portion 9 at the top for setting the tape transmission mechanism to a specified operation mode.
a, and a cutout 9b at the bottom that can lock the switching plate 9 in a predetermined operation mode.
is provided. The uneven portion 9a is provided with pins 10a and 1 of the first and second switching levers 10 and 11.
1a abut against each other, and the notch 9b has a switching gear lever 3a.
A lock plate 12 pressed by is in contact with the lock plate 12 . 13 and 14 are the first and second switching levers 1;
0, 11, the first and second relay levers 13, 14
One end is loosely fitted to the supply reel shaft 15 and the take-up reel shaft 16, respectively, and the spring 1
The pins 10a and 11a are urged against the switching plate 9 by the pins 7 and 18.
Note that 19 indicates a locking pin of the lock plate 12.

Next, the transmission mechanism of the tape running system indicated by the dashed line will be explained.

20 and 21 are flywheel gears that rotate together with the flywheels connected to the capstan shafts 20a and 21a when performing normal regeneration and reverse regeneration, and 22 and 23 are transmissions in which the rotational force from an intermediate pulley (not shown) is reduced in speed. drive gears 24 and 25 rotating in opposite directions are pivotally supported by the first and second relay levers 13 and 14,
This is a supply gear that rotationally drives the supply reel shaft 15 and the take-up reel shaft 16, and a relay gear meshing with the take-up gears 26 and 27.

The cam gear 2 described above can be driven by a small control motor, but as will be described later, if the rotational force is applied from a reduction gear (not shown) connected to the drive gears 22 and 23, , this switching mechanism can be operated by a tape drive motor.

In addition, for tape recorders with reverse playback function, supply reel, take-up reel,
Although there is no need to make a particular distinction, the settings will be explained as described above.

Next, the switching control of this invention is shown in FIG.
The explanation will be given with reference to the movements of the cam, the first and second slide levers 4 and 5, and the switching plate 9 shown by b and c.

First, from Fig. 2a showing the state of Fig. 1, cam 1
Assume that the switching gear 3 is rotated 180 degrees counterclockwise by contacting the cam gear 2 as will be described later. Then, the first slide lever 4 is moved to the left by the apex of the cam 1, resulting in the state shown in FIG. 2b. At this time, since the switching plate 9 of the second slide lever 5 is locked by the lock plate 12, the protrusion 5b of the second slide lever 5 collides with the switching plate 9 and cannot be moved. Therefore, the movement of the first slide lever 4 brings the spring 6 into a tensioned state, and the spring 6
The contraction force of is stored. After the cam 1 has rotated by a predetermined angle, when the switching gear lever 3a is driven in the direction of disengagement, the rotation of the cam 1 is stopped and the lock plate 1 is
2 moves backward, releasing the locking state of the switching plate 9. Then, the second slide lever 5 is biased to the left by the contraction force of the spring 6, and collides with the cam 1 while pushing the switching plate 9 with the protrusion 5b, resulting in the state shown in FIG. 2c.

As mentioned above, the switching mechanism of the present invention has the following features:
The cam 1 rotates by a predetermined angle in accordance with the operating mode, and at this time, one of the first and second slide levers 4 and 5 is moved. After this movement, the lock plate 12 moves backward to release the locked state of the switching plate 9, and operates to instantly move the switching plate 9 to a predetermined position together with the other slide levers 4 and 5.

Figure 3 a, b, c, d shows such switching plate 9.
1 is a diagram schematically showing the movements of the gears of the transmission system shown in the embodiment of FIG. 1 to form each operation mode according to the movements of FIG.

In this figure, FIG. 3a shows the normal playback (FWD) mode, in which the pin 11a of the second switching lever 11 falls into the recess of the switching plate 9, so that the first relay lever 14 is clocked. The rotational force of the drive gear 23 is transferred to the relay gear 2.
5, the take-up gear 27 is rotated to wind the tape onto a take-up reel (not shown) at normal speed. In this case, since the pin 10a of the first switching lever 10 is in the neutral position, the relay gear 24 and the supply gear 26 are in a free state.

FIG. 3b shows the rewind (REW) mode, in which the pin 10a of the first switching lever 10 rides on the convex part of the switching plate 9, and the second switching lever No. 11 pin 11a is in the neutral position.

Therefore, the first relay lever 13 is rotated clockwise by the first switching lever 10, the relay gear 24 meshes with the flywheel gear 20, and the flywheel (Fig. The rotational force (not shown) is transmitted to the supply gear 26 to wind the tape at high speed.

FIG. 3c shows the fast forward (F/F) mode, in which only the pin 11a of the second switching lever 11 is controlled to ride on the convex portion of the switching plate 9.

Therefore, the relay gear 25 meshes with the flywheel gear 21, and the fast rotational force of the flywheel is transmitted to the take-up gear 27, thereby realizing the tape fast-forwarding mode.

Furthermore, FIG. 3d shows the reverse playback (REV) mode of the tape recorder, and in this case, the pin 10a of the first switching lever 10 falls into the recess of the switching plate 9, contrary to FIG. 3a. , the rotational force of the drive gear 22 is transmitted to the supply gear 26 via the relay gear 24. Therefore, the tape is rewound at normal speed, and at this time the recording channel on the reverse side is played back.

In the above explanation, in the fast forward mode and rewind mode, the pinch roller and magnetic head are controlled to retreat from the tape by a mechanism not shown in the figure, as in a normal tape recorder, and in the normal play mode and reverse play mode. Needless to say, in this case, one of the pinch rollers is controlled to move away from the capstan.

FIG. 4 shows an embodiment of a control switch and a drive gear for the cam when rotating the cam to a predetermined position, where 1 is a cam and 2 is a cam gear having a two-stage configuration. The upper gear 2a of the cam gear 2 rotates together with the cam 1, but the lower gear 2b is rotated in a free state by being transmitted with a reduced rotational force from an intermediate pulley (not shown).

Therefore, the switching gear 3, which is also integrated with the cam gear 2 and has a two-stage configuration,
When the upper and lower gears 2a and 2b are engaged, the upper and lower gears 2a, 2b
rotate as a unit, and can rotate the cam 1.

The second cam 1a, which is shaped like a cut circle and is provided at the bottom of the cam 1, moves the magnetic head forward in the normal playback mode and reverse playback mode of the tape recorder, and moves the magnetic head in the fast forward mode and rewind mode of the tape recorder. Used for control when reversing.

In addition, there is a short-circuit contact provided inside the cam 1.
S ₁ and S ₂ are printed circuit boards P arranged on the upper surface thereof.
When the cam 1 rotates by a predetermined angle, the common contact C and the contacts C ₁ , C ₂ , and
C ₃ and C ₄ are connected and a control signal is output to control (reverse) the switching gear lever 3a.

Although the operation mode switching mechanism of the present invention has been described in detail above, the transmission mechanism using various gears and levers for setting the tape speed and direction may take other embodiments other than those shown by the chain lines in FIG. Alternatively, the link mechanism, cam mechanism, etc. may be operated according to the four commanded positions of the switching plate 9, and the operation mode may be set using another transmission mechanism.

Furthermore, the shape of the cam 1 varies depending on the pitch and spacing of the concavo-convex portions 9a of the switching plate 9, and in addition to the four operation modes shown in the embodiment, five operation modes including a stop state may be set. good.

Note that the switching gear lever 3a can be driven by a small plunger, and the cam 1 can be driven by a reduced rotational force, so the power required for switching is extremely small, and power saving can be achieved.

〔Effect of the invention〕

As explained in detail above, the switching mechanism of the tape recorder of the present invention is such that the cam, which rotates to a predetermined position in accordance with the operating mode, is clamped by two slide levers biased by a spring or the like. However, when this slide lever moves to a predetermined position, the contracting force of the stored spring is used to set the switching plate to the position corresponding to the operating mode, so setting the operating mode is energy-saving. It has the great advantage that it becomes more compact and more compact, and that once the cam has rotated to the position where the predetermined operating mode is set, the switching operation is instantaneous and no gear noise is generated.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the tape recorder operation mode switching mechanism of the present invention, FIG.
b and c are explanatory diagrams showing the movement of the slide lever and switching plate; Figures 3a, b, c, and d are schematic diagrams showing the operating modes of the transmission mechanism; and Figure 4 is a perspective view showing the cam drive mechanism. be. In the figure, 1 is a cam, 2 is a cam gear, 4 and 5 are first and second slide levers, 6 is a spring, and 9 is a switching plate.

Claims (1)

[Scope of Claims] 1. A cam that rotates by a predetermined angle in accordance with a designated operation mode, and a cam that is placed oppositely across the cam and that is biased in a direction to pinch the cam so that the cam rotates. first and second slide levers that are movable in accordance with the movement of the slide lever; a locking member for locking movement of the switching plate when the cam is rotating; setting various operating modes in relation to the position of the switching plate, and switching the tape recorder to the various operating modes; and a transmission mechanism arranged so that when the operation mode is switched, the rotation of the cam causes at least one of the first and second slide levers to move outward to a predetermined position. At the same time, the inward movement of the other slide lever is restricted by the switching plate locked to the locking member, and the locking is performed after the cam has rotated by a predetermined angle corresponding to the designated operation mode. Operation mode switching of a tape recorder, characterized in that by releasing the lock of the member, the switching plate is moved by the biasing force of the other slide lever, and switching between various operation modes is performed. mechanism.