JPS6292256A - Tape recorder - Google Patents

Abstract

PURPOSE:To control many modes with less number of components by selecting two operating modes from one operating mode by means of an electromagnet. CONSTITUTION:A head 41 is fixed onto a head base 40, guided by axes 42, 43 on the base 40 and moved to a cassette tape. A rod 45 is provided onto the base 40 and guided by shafts 46, 47 on the base 40. Projections 45a, 45b of the rod 45 are engaged with a pin 38 of a reversing plate when being biased to the right and engaged with a pin 39 when biased to the left to lift up the base 40 and to turn the reversing plate 33. Further, the other rod 45d is engaged with a slide switch 55 when biased to the left. That is, the rod 45 is placed horizontally to select forwarding/reversing. Then the rod is in the neutral position by parts 40a, 40b of the head base 40 and the rotation of the reel base is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape recorder capable of forward and reverse tape running.

Conventional technology In recent years, tape recorders that run the tape in forward and reverse directions have become popular, but many of these types of tape recorders use the rotational force of an electromagnet or motor to switch between forward and reverse directions. .

However, when switching the tape running, the idler,
In addition to the pinch roller, mechanical switching of head channels requires power and requires a separate mechanism, electromagnet, etc.

Problems to be Solved by the Invention As mentioned above, in the past, separate power was required to switch between forward and reverse directions, separate power was required to move the head up and down, and each required a cam and an electromagnet to extract the rotational force of the motor. .

In view of the above-mentioned problems, an object of the present invention is to provide a tape recorder that can raise the head with low power even when switching head channels, and can control many operation modes with fewer parts. It is said that

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a diagonal rod so as to be slidable on the head substrate, and uses this biased position to control the slide switch for switching the head channel, the rotation system, etc. The switching power is performed by the head lifting force.

With a configuration that exceeds the functions, power is hardly required to bias the opposite rod, and the power of the cam, etc. is only needed to raise the head board. In other words, it becomes mechanically simpler. In particular, power is required to switch channels in the head, making it possible to switch using a mechanical slide switch, which is more cost-effective than switching electrically.

Embodiments Hereinafter, tape recorders according to embodiments of the present invention will be described with reference to the drawings.

FIGS. 3 and 4 show the rotation system and rond system of this embodiment. The configuration of the rotating system shown in FIG. 3 will be explained.

A belt 21 from the motor 2o connects the first flywheel 22. The rotational force is transmitted to the second flywheel 23.

The transmission force of the operating rotation system is transmitted from a gear 24 that rotates together with the first flywheel 22 to a reduction gear 25. The cam gear 26 has intermittent teeth and faces the reduction gear 25.
Pink 27 planted on the head board by the first cam part
move.

The rotation system of the reel stand includes gears 28 to 29, which rotate together with the second flywheel 23. The transmission force is transmitted to gear 30a and gear 31, which are coaxial with gear 3o, and the speed is reduced. The gear 31 is pivotally supported on the idler plate 32, and the gear 3o
It is possible to rotate on the same axis. The idler plate 32 is engaged with a reversing plate 33 whose rotation axis is a shaft 34 on the board. When the gear 31 rotates to the right, it meshes with the gear 35 and the first
The rotation is transmitted to the reel stand gear 36 coaxial with the reel stand.

When the gear 31 rotates to the left, the rotation is transmitted to the reel stand gear 37 coaxial with the second reel stand.

When the tab 9 and the pin 38 on the reversing plate are moved upward, the forward reel stand takes up the winding, and when the pin 39 is moved upward, the reversing reel stand takes up the winding.

On the other hand, rods will be explained with reference to FIG. A head 41 is fixed on the head substrate 4o and moves relative to the cassette tape 44 while being guided by shafts 42 and 43 on the substrate.

There is a rod 45 on the head substrate 40, guided by axes 46, 47 on the head substrate. The convex portions 45 & 46b of the rod 46 engage with the pin 38 of the reversing plate when the rod 46 moves to the right, and engage with the pin 39 when the rod 46 moves to the left.
The reversing plate 33 is rotated with the rise of 0. Further, when the other rod 46d moves to the left, it engages with the slide switch 66.

That is, normal rotation and reversal are selected by positioning the rod 45 on the left and right sides. Of course, the 5TO shown in Figures 3 and 4
At position P, part 40a of the head substrate.

40b brings the reel to a neutral position, and the reel stand stops rotating.

Next, the control member will be explained. FIG. 5 corresponds to the stop position in FIG. 3, and the cam gear 26 shows the second cam surface (the first cam surface is indicated by a dotted line). 48 pins 48a engage with pawls on the second cam surface 26& to lock the cam.

The control member 48 is rotatably supported by a shaft 49 on the substrate, and connected by a pin 62 to a control member 61 which is also rotatably supported by the shaft 5o. One end 51a of the control member 51
A movable piece 53& of the attraction type electromagnet 53 is supported by the movable piece 53&. Further, one end 51b engages with the groove 460 of the rod 46, and the rod 45 and the control member 51 are interlocked at the 5TOP position. The control member is biased by the spring 54 in the direction of releasing the movable piece from adsorption and in the direction of releasing the lock of the pawl cam gear 26.

Here, the structure of the attraction type electromagnet will be explained with reference to FIG.

In FIG. 8, a magnet 9 and two fixed cores 10.11 are fixed to a frame 8, and a coil 12 is wound around the fixed core 10.11. In this magnet 9, the ends 10a and 11a of fixed cores 10 and 11 are magnetized so that they become N and S poles, while the coil 12 generates a magnetic field that cancels out this magnetic force when current is passed through it. do. Furthermore, the movable core 13 is brought into contact with the tips 10a and 11a of the fixed core, and is normally attracted by the attraction force of the magnet 9. Then, by energizing the coil 12, the attraction force disappears and the load is released. Furthermore, this 10a, 11+! , 13 are mirror-finished to increase the suction force.

The characteristics of this magnet electromagnet are shown in FIG.

The horizontal axis represents the applied voltage V, the vertical axis represents the load F, and the movable iron core 13
The voltage at which the movable iron core 13 starts to drop is plotted when a load F opposite to the adsorption force is applied to the graph. As aforementioned,
Since the attraction force of the electromagnet is large, the set load F can be maintained at 'A-'A of the attraction force. If a voltage larger than the critical voltage v1 is applied, the solenoid can be turned ON and OFF, the set load F1 can be set to 9, and power can be output with less loss due to stroke.
Since the adsorption force only needs to be A-min, the shape can be made smaller accordingly. However, once this electromagnet is activated, it cannot return the movable core by itself, and must be returned using another force.

The operation of this embodiment having the above configuration will be explained below.

When the electromagnet 53 is energized in the STOP state as shown in FIG. The intermittent portion is moved by the outer side 26b of the second cam portion, the gear 25 and the cam gear 26 are engaged, and the cam starts rotating.Then, the control rod 48 is rotated by the outer side 26b of the second cam portion, and the movable piece 631L of the electromagnet is moved. is returned to the suction position. If there is no current during the first return, the head substrate 4o will rise while the rod 45 is attracted to the left. In other words, the state shown in FIG. 2 is reached, resulting in a reverse play. Further, at this time, the slide switch 55 is being moved by the rod 45d. (Although not shown, the same applies to the selection of pinch rollers, etc.) If there is still electricity when the first cam is returned, the rod 45 rotates along the outside 26b of the second cam part. The head substrate 40 rises while being shifted to the right. The tab will be in the state shown in FIG. 1, which means forward rotation play. Further, at this time, the slide switch 66 is not engaged and therefore does not move. (Although not shown, the same applies to the selection of pinch rollers, etc.) Along the outer side 26b of the second cam surface, the detached piece is also returned to the suction position as the head rises (second return). Then, at the lock position of 26 &, move the intermittent tooth part to gear 2.
It is locked facing 6.

From normal rotation or reverse play to 5TOP, when the electromagnet 63 is similarly energized to release the lock, the head board descends along the first cam surface, and the slide switch 55 that moved during the reverse rotation is also returned). Outside 26 of cam surface
It is returned to the suction position at b and locked at the 5TOP position by the claw portion 26a. At the 5TOP position, the slide switch is in the normal rotation position.

The above cam operation will be further explained with reference to the timing diagram of FIG. Fig. 7(a) shows the first cam part and the rise of the head board (position of the bin 27), and Fig. 7(b) shows the second cam part and the position of the control member (bin 4Elx 7th position). FIG. 7(C) shows the energization time of the electromagnet during reverse play, and FIG. 7(d) shows the energization time of the electromagnet during normal play.

In other words, from the 5TOP position, if the power is turned on at the branch point during the first return, the path will be as shown by ■, and if it is not, the path will be as shown in ■.
Each corresponds to one normal play and one reverse play.

In this example, from 5TOP, forward play 2 reverse play
We have shown an example of moving to y, but similarly from 5TOP to FF (
It can also be applied to fast forwarding) and RAW (rewinding), and various possibilities are possible.

Effects of the Invention As described above, in the present invention, it is possible to select and move between one operation mode and two operation modes with one electromagnet, and many modes can be controlled with fewer parts.

In particular, power is required for head channel switching.
Switching using the power of the head lift has a higher cost reduction effect than switching electrically.

[Brief explanation of drawings]

FIG. 1 is a front view of a tape recorder according to an embodiment of the present invention in a normal play state, and FIG. 2 is a front view showing a tape recorder in a reverse play state.
Fig. 3 is a front view showing the rotation system in the 5TOP state, Fig. 4 is a front view showing the Rondo system in the 5TOP state, and Fig. 6 is a front view showing the control member in the 5TOP state. , FIG. 6 is a front view showing the operating state of the electromagnet, FIG. 7 is a timing diagram of the cam, FIG. 8 is a structural diagram of the attraction type electromagnet, and FIG. 9 is a characteristic diagram thereof. 20...Motor, 21...Belt, 2
6...Cam gear, 36...Reel stand gear, 37...Reel stand gear, 40...
Head board, 44...Cassette tape, 45.
...Rod, 48.51 ...Control member,
53... Adsorption type electromagnet, 55... Slide switch. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 7 Mound C>
Keyaki Ichiji size

Claims (1)

[Claims] A magnetic head, a head substrate on which the magnetic head is fixed and moved, a diagonal rod that moves on the head substrate in a direction orthogonal to the moving direction of the head substrate, a rotation system for a reel stand, a pinch roller system, an operating mechanism for moving the head substrate; and a slide switch for switching the track channel when the magnetic head rotates forward and reverse; When the head board rises, the rising force causes the rotation system of the reel stand and the pinch roller system to rotate forward or reverse.
The normal/reverse rod also engages with the slide switch and is switched to the forward or reverse rotation position, and when the normal/reverse rod is biased to the second position and the head board rises, the upward force causes the reel stand to move upward. The tape recorder is configured such that the rotation system and the pinch roller system are in a reverse or forward rotation state, but the normal/reverse rod and the slide switch are not engaged and are held in the reverse position.