JPS5858741B2 - Reproducing head feeding device in magnetic sheet reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel device for linearly moving a reproducing head of a magnetic sheet reproducing device in the radial direction of a rotating turntable.

More specifically, two gears with different diameters, one of which is fixed to the drive shaft of the turntable and the other is loosely coupled, and an intermediate gear having teeth that mesh with each of the gears are used to connect the drive shaft to the turntable. generates a relative rotational movement in the other gear which is loosely coupled to the rotated turntable, and moves the endless traveling belt to which the playback head is connected by means of a rotating body integrated with the gear, thereby moving the head in a straight line. The present invention relates to a feeding device for a reproducing head in a magnetic sheet reproducing apparatus in which a gear train can achieve a spiral motion by combining rotational motion and linear motion.

A magnetic sheet playback device generates sound by scanning a magnetic recording track formed on the back side of a magnetic sheet with a playback head, and obtains audio auditory information along with visual information displayed on the front side of the magnetic sheet. For example, language learning can be performed using image information.

In this case, if the magnetic sheet is rotated, the visual information displayed on its surface cannot be seen, so it is necessary to set the magnetic sheet in a fixed position. The recording track must be scanned.

FIG. 1 shows a magnetic sheet reproducing device 1 constructed as described above, and this device 1 consists of a main body 2 and a frame-shaped lid plate 3 pivotally attached to the main body 2 so as to be openable and closable.

A circular hole 4a is formed in the top plate 4 of the main body 2, and a turntable 5 is rotatably fitted into the circular hole 4a.

A long hole 5a is bored in the turntable 5 in the radial direction,
A reproducing head 6 projects upward from inside the main body 2, facing the elongated hole 5a.

The reproducing head 6 is configured to move linearly along the elongated hole 5a, and therefore, the reproducing head 6 performs a spiral movement by combining the rotational movement of the turntable 50 and this linear movement.

Main body 2 has magnetic sheet 7 with magnetic recording track measurement on the back side.
is placed, the cover plate 3 is closed to the main body 2 and the four peripheries of the magnetic sheet 7 are pressed, and the magnetic sheet 1 is clamped and fixed by the main body 2 and the cover plate 3 and set.

After this, if the playback head 6 is caused to make a spiral motion as described above, this head 6 will scan the recording track.
Visual information and auditory information on the surface 1a of the magnetic sheet 70 can be obtained.

Conventionally, mechanisms for causing the reproducing head 6 to make a spiral motion have been based on a guide groove type or a feed screw type.

In the guide groove method, a guide plate with a spiral guide groove is fixed inside the main body 2, a guide rod is attached to the bottom surface of the turntable 5 in alignment with the direction of the elongated hole 5a, and the playback head 6 is attached to this guide. The reproducing head 6 is loosely engaged with the rod and also engaged with the guide groove, and as the turntable 50 rotates, the reproducing head 6 is guided by the spiral guide groove and the guide rod and performs a spiral motion.

In this type of playback head feeding mechanism, the moving playback head contacts the fixed guide plate, and the playback head makes a spiral motion due to the contact engagement between the guide groove and the playback head, which generates frictional force during this movement. This amount becomes a load on the drive shaft, and there is a problem that a torque of several tens of percent of the frictional resistance acts on the drive shaft of the turntable.

In addition, the guide grooves also need to be molded into the same shape to match the recording tracks on the magnetic sheet, which is not only cumbersome to process, but also requires setting the distance between the guide grooves to a certain extent, which reduces the total length of the recording track. There are also problems such as the length becoming shorter.

In the feed screw mechanism, a gear is fixed to the drive shaft of the turntable, and the feed screw to which the playback head is screwed is engaged with the gear, and as the drive shaft rotates, the playback head is moved by the feeding action of the feed screw. It creates a spiral motion.

As a result, the nut that screws together the feed screw and the reproduction head generates a frictional force on the feed screw, and this frictional force becomes a load on the turntable, so that the drive shaft must bear extra torque.

In addition, the feed screw is the most important part of the playback head feeding device using this method, and the device itself is more expensive than other methods, such as the screw pitch must be precisely formed.

The inventors of the present invention have devised the present invention in view of the above-mentioned conventional problems and to effectively solve the problems.

The object of the present invention is to provide a magnetic sheet reproducing apparatus in which a reproducing head moves linearly in the radial direction of a turntable, and the reproducing head moves spirally by combining the rotational movement of the turntable and this linear movement. One of the two gears with different diameters is fixed to the drive shaft of the turntable,
An intermediate gear having a tooth portion that engages the other gear in a freely rotatable manner and meshes with each of the two gears generates a relative rotational movement in the other gear that is loosely engaged with respect to the rotation of the turntable. A second rotating body is provided, in which the gear and the first rotating body are integrated, and an endless running belt such as a belt to which a reproducing head is connected is provided on the outer circumferential side of the first rotating body and the turntable. A third rotating body is provided that stretches this endless running belt in the radial direction of the turntable, and the reproducing head is moved linearly by running this running belt by the above-mentioned relative rotational movement. Provided is a reproducing head feeding device in a magnetic sheet reproducing device that causes the reproducing head to spirally move as it rotates.

Therefore, an object of the present invention is to reduce the load on the drive shaft of the turntable, since the reproducing head feeding mechanism is composed of a gear train, compared to the conventional feeding mechanism that generates frictional resistance. To provide a reproducing head feeding device in a magnetic sheet reproducing device which is capable of performing the following steps, has extremely smaller torque loss than conventional devices, and is extremely advantageous in terms of driving torque.

Further, the object of the present invention is to fix one of two gears with different diameters to the drive shaft of a turntable, loosely engage the other gear, and mesh the gears on each side with these two gears. At the same time, this gear can be freely separated and combined by a one-way clutch, and the other loosely coupled gear can be rotated by a gear connected to a fast return rotating shaft via a one-way clutch, The loose gear is driven independently by this rotating shaft to rotate the rotating body integrated with this gear at high speed, and the playback head is connected to the rotating body. To provide a reproducing head feeding device in a magnetic sheet reproducing device capable of quickly reversing to the previous position.

Therefore, it is an object of the present invention that the playback head fast return mechanism can be configured even with a gear train that does not use any guide grooves or feed screws, and that it is possible to configure the playback head fast return mechanism both during audio playback and when the playback head returns quickly. All mechanisms are achieved by gear parts,
To provide a reproducing head feeding device in a magnetic sheet reproducing device whose structure is simpler than that of conventional devices.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The outer parts and structure of the magnetic sheet reproducing device itself are
Since it is the same as the apparatus 1 shown in the figure, a description thereof will be omitted, and the same reference numerals will be used in the following description for parts that are the same as those shown in FIG.

That is, 5 is a turntable, 5a is a long hole, and 6 is a reproducing head.

First, the first aspect of the present invention will be explained with reference to FIGS. 2 to 4.

Reference numeral 10 shown in FIG. 2 is a drive shaft, and a turntable 5 is fixed to the upper end of this 10 and is integrated with the drive shaft.

A shaft 12 that rotatably supports a small diameter pulley 11 is attached to the turntable 5, and a belt 14 is wound around a large diameter pulley 13 and a small diameter pulley 11 loosely coupled to a drive shaft 10 to pass the frame.

A reproducing head 6 is connected to the belt 14, and the reproducing head 6 faces the long hole 5a and projects above the turntable 5.

A shaft 16 that rotatably supports another small diameter pulley 15 is attached to the turntable 5 in proximity to the drive shaft 10, and 77) the small diameter 7" pulley 15 functions as a tension roller for the belt 14. and the part 14a of the belt 14 is directed in the same direction as the elongated hole 5a, that is, the turntable 50
It also has the function of stretching in the radial direction.

Therefore, when the large diameter pulley 13 is rotated with respect to the stationary turntable 5, the belt 14 runs, and the reproducing head 6 performs a linear motion along the long hole 5a.

In this case, the turntable 5 and the large diameter pulley 13 do not rotate at the same speed, and there is a discrepancy in their rotational speeds.
3 performs a relative rotational movement, the reproducing head 6 performs a spiral movement by combining the rotational movement of the turntable 50 and the linear movement.

Therefore, the reproducing head 60 traveling means is not limited to the belt 14, but may be a wire, for example, or any endless traveling belt.

Also, the one that runs this endless running belt is the above-mentioned pulley IL.
It is not necessary to limit the number to 13 and 15, and a rotating body suitable for the type of this endless running belt can be used.

As shown in FIG. 3, the top and bottom of the drive shaft 10 of the turntable 5 are positioned by rings 1γ and 18, and a gear 19 is loosely engaged with the drive shaft 10, so that the gear 19 can freely rotate with respect to the drive shaft 10.

This gear 19 is integrated with the large diameter pulley 13, and the large diameter pulley 13 also rotates together with the gear 19.

A gear 20 is fixed to the lower end of the drive shaft 10.
The diameter of the gear 19 is set to be somewhat larger than that of the gear 19.

An intermediate gear 21 having a tooth portion 21at21b that meshes with both the gears 19 and 200 is arranged in parallel on the measuring portion of the drive shaft 10,
Although the drawing shows a case in which the intermediate gear 21 is fixed to the support shaft 22, the intermediate gear 21 may be loosely engaged with the support shaft 22.

In the above description, the number of teeth of the gear 19 is set to n-1, and the number of teeth of the gear 20 is set to n.

When the drive shaft 10 connected to the motor is driven, the turntable 5 rotates, and at the same time, the gear 20 also rotates.

The rotation of gear 20 is transmitted to intermediate gear 21, and further to gear 1.
9 is also transmitted.

The gear 19 loosely coupled to the drive shaft 10 is a fixed gear 20.
Since the diameter is smaller than that of the turntable 5, there is a discrepancy in the rotational speed of these 19 and 20, and the rotational speed of the small-diameter gear 19 is faster than that of the large-diameter gear 20, and a relative rotational movement occurs between the turntable 5 and the gear 19. .

Assuming that the rotation direction of the drive shaft 200 is the direction of arrow A in Fig. 3,
Since the gear 19 also rotates in the same direction, the pulley 13 integrated with the gear 19 causes the reproducing head 6 to spirally move from the outer periphery of the turntable 5 toward the center.

If the diameter of the pulley is D, the number of teeth of the gears 19 and 20 is nLn, so the radial component of this moving speed is per turntable 501 rotation, and as the turntable 5 rotates, the reproducing head 6 It can be moved at equal pitches.

These are the gears 19, 20 and the tooth portion 21a of the intermediate gear 21.
, 2lb are all the same module, and the gears 19 and 200 modules do not necessarily need to be set the same, and the gear 19 and the tooth portion 21a mesh,
If the gear 20 and the tooth portion 21b mesh with each other and the gear 19 has a smaller diameter than the gear 20, the reproducing head 6 can be moved from the outer periphery of the turntable 5 toward the center by the smaller diameter.

FIG. 4 shows another embodiment of the first invention, in which the gear 19 is a large diameter gear 19' and the gear 20 is a small diameter gear 20'.
And so.

The rotational speed of the gear 19' is slower than that of the gear 20', and therefore, if the drive shaft 10 rotates in the direction of arrow A, the rotation of the pulley 13 lags behind the rotation of the turntable 5, so the reproducing head 6 is It will move from the middle tu (Aυ to the outer periphery).

This embodiment is suitable for a magnetic sheet in which the scanning direction of the spiral recording track is determined from the center side to the outer periphery.

Next, a second aspect of the present invention will be explained.

This invention adds a fast return mechanism for the playback head to the first invention, which was made for reproducing audio by moving the playback head at a low speed.

As shown in FIG. 5, a gear 19 is loosely engaged with the drive shaft 10 of the turntable 5, and a gear 20 is fixedly attached.

Since the gear 19 has a smaller diameter than the gear 20, the reproduction head 6 moves from the outer circumferential side to the center of the turntable 5 to reproduce the audio, as is clear from the above description.

Two gears 30 and 31 are provided on the measuring part of the drive shaft 10, one gear 30 is freely rotatably engaged with the support shaft 32 by a ring 34a t 34b, and the other gear 31
is fixed to the support shaft 32.

The loose gear 30 is brought into mesh with the small diameter gear 19, and the fixed gear 31 is brought into mesh with the large diameter gear 20.

A cylindrical portion 30a is formed to hang down from the lower surface of the gear 30, and the gear 31
A protrusion 31a is provided on the upper surface of the cylindrical portion 30a to be inserted with an appropriate distance S between the cylindrical portion 30a and the cylindrical portion 30a.

A one-way clutch 33 is formed by the cylindrical portion 30a and the protrusion 31a.

The specific structure of this one-way clutch 33 is shown in FIG.

That is, notches 34 are formed in the inner diameter portion of the cylindrical portion 30a, and four notches 34 are provided at equal angular intervals in the drawing.

A pawl 35 is rotatably attached to the protrusion 31a by being pivotally attached to a pin 36, and the tensile force of a tension spring 37 is applied to the pawl 35, so that the water 35 is normally stored in the storage recess 38.

Two pawls 35 are attached to the protrusion 31a, and when the support shaft 32 is stopped, the pawls 35 and 35 close, and when the support shaft 32 rotates in the direction of the arrow and the gear 31 also begins to rotate in the same direction.
The pawl 35 expands due to centrifugal force against the tensile force of the spring 31, and comes to rest in the notch 34 as shown in the drawing, thereby joining and integrating the two gears 30 and 31.

A gear 40 fixed to a shaft 39 is meshed with the gear 30,
This gear 40 is a gear for quick return.

A cylindrical body 41 is fixed to the lower end of the shaft 39, and a protruding member 43 integrated with a quick return drive shaft 42 is inserted into this cylindrical body 41.

A one-way clutch 44 is formed by the cylindrical body 41 and the member 43, a notch is formed in the inner diameter portion of the cylindrical body 41 like the cylindrical part 30a, and the protruding member 43 has a notch similar to the protruding part 31a. A claw 45 is attached to the.

The direction of this pawl 45 is the same as that of the pawl 35, and when the fast return drive shaft 42 rotates in the direction of arrow C, this pawl 44 expands due to centrifugal force and engages with the notch of the cylinder body 41. The connection between the drive shaft 42 and the shaft 39 is established, causing the gear 40 to rotate in the same direction.

When the drive shaft 42 is stopped, the pawl 45 is closed by the tension spring, the drive shaft 42 and the shaft 39 are separated, and the one-way clutch 4 is closed.
4 makes it possible to freely approach and separate.

To describe its operation, when the drive shaft 10 rotates in the direction of arrow A in FIG. 5, the gear 31 meshing with the gear 20 rotates the support shaft in the direction of the arrow.

As a result, the pawls 35 are expanded by centrifugal force, and the separated gears 30 and 31 are connected by the first one-way clutch 33, causing the gear 19 loosely engaged with the drive shaft 10 to rotate.

As a result, the playback head 6 moves in a spiral motion from the outer circumference side to the center side of the turntable 5 due to the feeding action of the pulley 13, thereby playing back the audio.

In this case, the gear 30 rotates the shaft 39 via the gear 40, but the pawl 45 of the second one-way clutch 44 is in a closed state because the quick return drive shaft 42 is stopped, and the shaft 39 is rotated by the gear 30.
9 and the drive shaft 42 are not connected, and the gear 40 merely rotates idly.

When the playback of the audio is completed and the playback head 6 is to be returned to its previous position, the flattening drive shaft 42 in FIG. 5 is rotated at high speed in the direction of the arrow C.

As a result, the pawls 45 are expanded and the second one-way clutch 44
The connection between the drive shaft 42 and the shaft 39 is established, and the gear 40
Rotate in the same direction (toward direction).

The gear 30 meshed with the gear 40 freely rotates with respect to the support shaft 32, causing the gear 19 to rotate in a direction opposite to that for audio, thereby quickly returning the reproducing head 6 to its previous position.

In this case, since the drive shaft 10 of the turntable 5 is stopped, the pawl 35 of the first one-way clutch 33 is in a closed state, so the free rotation of the gear 30 is ensured, and the turntable 5 is also stopped. Therefore, the reproducing head 6 performs only a linear motion, does not perform a spiral motion, and quickly returns to its previous position by linear motion.

7 and 8 show another embodiment of the second invention.

In this embodiment, the driving force of the quick return drive shaft 42' is transferred to the gear 3.
The signal is transmitted directly to the gear 19 without going through 0.

That is, the gear 19 is attached to the shaft 39' which can freely approach and separate from the fast return drive shaft 42' by the second one-way clutch 44'.
A gear 40' that meshes with is attached.

The configuration of the one-way clutch 44' is shown in FIG.
The direction of the claw 45' is similar to the direction of the claw 45 (or the claw 35 in the first invention).
) is the opposite.

A claw 45' on which the tension force of a tension spring 46' is applied is pivoted to a pin 41' and is attached to a protruding member 43' fixed to the quick-return drive shaft 42', and is fixed to the shaft 39'. A notch 48' is formed in the inner diameter portion of the cylindrical body 41'.

This second one-way clutch 44' is connected to the quick return drive shaft 4
When 2' rotates in the two directions of the arrows, the pawls 45' are expanded by centrifugal force to connect the drive shaft 42' and the shaft 39'.

Also in this embodiment, when the drive shaft 10 of the turntable 5 rotates in the direction of arrow A, the first one-way clutch 33
connects the gears 30 and 31 and causes the reproducing head 6 to spirally move by the pulley 13.

After the audio reproduction is finished, the drive shaft 10 of the turntable 5 is stopped and the fast return drive shaft 42' is rotated at high speed in the two directions of the arrows. The gear 19 connected to the gear 40' and meshed with the gear 40'
rotates in the opposite direction to that during audio reproduction to quickly return the playback head 6.

The second invention described above has a gear 19 loosely coupled to the drive shaft 10.
Although the fixed gear 20 is made to have a small diameter and the fixed gear 20 is made to have a large diameter, it is of course possible to reverse this as in the other embodiment of the first invention. are reversed, and the first and second one-way clutches 33, 44,
The direction of contact and separation of 44' may be reversed.

As is clear from the above description, according to the first aspect of the present invention, the turntable is manufactured by using a gear loosely coupled to the drive shaft of the turntable, a gear fixed to the drive shaft, and an intermediate gear meshing with these gears. The playback head can be moved linearly with the rotation of the turntable, and a spiral motion is created by combining the rotational movement of the turntable and this linear movement. can now be configured by a gear train, and compared to the guide groove method, feed screw method, etc., frictional resistance does not occur and torque loss can be suppressed as much as possible.

Furthermore, by changing the diameter of the gear that is loosely coupled to the drive shaft and the diameter of the gear that is fixed, and by reversing the sizes of these, the feeding direction of the playback head can be reversed. This device can be applied to two types of magnetic sheets in which the scanning direction of the reproducing head is determined from center to center or from center to outer peripheral side, and there is no need to limit the direction in which the reproducing head is fed.

Further, according to the second aspect of the present invention, in addition to the spiral movement of the playback head during audio reproduction, by using the fast return drive shaft and the first and second one-way clutches, the The playback head can be quickly returned to the previous position, and the time required to return the playback head can be shortened.

Furthermore, as is clear from each embodiment, two mounting positions can be selected for the second one-way clutch, and the one that is most suitable and that does not interfere with other parts takes into consideration the arrangement positions of other parts of the regeneration device. It offers various features such as being able to select the location.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of the magnetic sheet reproducing device, FIG. 2 is a plan view of the turntable portion, and FIGS. 3 and 4 are cross-sectional views showing each embodiment according to the first invention. 8 shows each embodiment of the second invention, FIGS. 5 and 7 are similar to FIG. 3, FIG. 6 is a sectional view taken along the line 6-6 in FIG. 5, and FIG. It is a sectional view taken along line 8-8. In the drawings, 1 is a playback device, 5 is a turntable, 6 is a playback head, 10 is a drive shaft, 11 is a small diameter pulley that is a second rotating body, 13 is a pulley that is a first rotating body, and 14 is a A belt is an endless running belt, 15 is a small diameter pulley that is a third rotating body, 19 is a first gear, 20 is a second gear, 21
is an intermediate gear, 30 is a third gear, 31 is a fourth gear, 3
3 is a first one-way clutch, 40 is a fifth gear, 42 is a fast return drive shaft, 44. s4'+i second one-way clutch.

Claims (1)

[Scope of Claims] 1. A magnetic sheet reproducing device in which the reproducing head moves linearly in the radial direction of the turntable, and the reproducing head moves spirally by combining the rotational movement of the turntable and this linear movement. a first gear that is freely rotatably coupled to the drive shaft of the turntable; a second gear that has a different diameter from the first gear; and that is fixed to the drive shaft; an intermediate gear having teeth that mesh with the second gear; a first rotating body integrated with the first gear;
a second rotating body provided around the outer periphery of the turntable;
A rack extends between the first and second rotating bodies, and includes an endless running belt to which a reproducing head is coupled, and a third rotating belt provided at the center side of the turntable and extending the endless running belt in the radial direction of the turntable. A reproducing head in a magnetic sheet reproducing apparatus, characterized in that the drive shaft is configured to rotate the turntable, and the first rotary member is rotated at a reduced speed to cause the reproducing head to move in a spiral motion. feeding device. 2. A reproducing head feeding device in a magnetic sheet reproducing apparatus according to claim 1, wherein the first gear has a small diameter and the second gear has a large diameter. 3. A reproducing head feeding device in a magnetic sheet reproducing apparatus according to claim 1, wherein the first gear has a large diameter and the second gear has a small diameter. 4. In a magnetic sheet reproducing device in which the reproducing head moves linearly in the radial direction of the turntable, and the reproducing head makes a spiral movement by combining the rotational movement of the turntable and this linear movement, a free shaft is attached to the drive shaft of the turntable. A first gear rotatably engaged with each other, a second gear having a different diameter from the first gear and fixed to the drive shaft, and a third gear meshing with the first gear. a fourth gear that meshes with the second gear; a first one-way clutch that separates and combines the third and fourth gears; a fifth gear that is attached via a clutch and transmits the rotational force of the quick return drive shaft to the first gear; a first rotating body that is integrated with the first gear; and the turntable. a second rotary body provided around the outer periphery of the turntable; a rack passing between the first and second rotary bodies and an endless traveling band to which a reproducing head is connected; It consists of a third rotating body that stretches the band in the radial direction of the turntable, and when the fast return drive shaft rotates, a fifth gear connected to this drive shaft via a second one-way clutch rotates the third rotating body. 1. A reproducing head feeding device in a magnetic sheet reproducing apparatus, characterized in that the reproducing head is fast reversed by rotating a first gear. 5. In claim 4, the fifth gear is meshed with the third gear, and the rotational force of the quick return drive shaft is indirectly transmitted to the first gear via the third gear. 1. A reproducing head feeding device in a magnetic sheet reproducing device, characterized in that the reproducing head feeding device is configured to perform the following steps. 6. According to claim 4, the fifth gear is meshed with the first gear so that the rotational force of the fast return drive shaft is directly transmitted to the first gear. A reproducing head feeding device in a magnetic sheet reproducing device.