JPH0136166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder drive device suitable for driving a tape running system using a logic control method.

Conventionally, in tape recorders equipped with a logic control type tape running system, the recording/playback head is driven by the attraction force of at least two motors and one or more large electromagnets, and the recording/playback head is driven by the attraction force of at least two motors and one or more large electromagnets.
REW and STOP modes were selected, but the problems were that the electromagnet was large, resulting in large instantaneous power consumption and noise, and the mechanism itself was large and heavy.

In recent years, the use of logic control type tape recorders as portable devices has been expanding, and for this reason, there has been a need for tape recorder mechanisms that are energy efficient, smaller, thinner, and lighter.

Against this background, many mechanisms have been released by various companies. One such mechanism uses a single motor and multiple small electromagnets. This mechanism requires only a small amount of current and time to flow through the electromagnet, but there are problems in that the structure is complicated and the cost is high. Others use two motors and one or more electromagnets, but these have disadvantages in terms of weight, size, and cost.

The present invention can switch between PLAY, FF, REW, and STOP modes with a configuration of one motor and one ultra-small electromagnet, has a simple and inexpensive structure, and can also be made smaller and thinner. The object of the present invention is to provide a tape recorder drive device that is lightweight and usable even at low voltage.

In order to achieve such an object, the present invention transmits rotation from a motor to a sun gear of a planetary gear device,
The first output measurement of the planetary gear device is connected to a transmission system that drives the reel stand, and the second output measurement is connected to a cam drive system that drives the head board so as to transmit rotation, respectively, so as to operate the head board. The present invention provides a drive device for a tape recorder in which a load is applied to the first output measurement using an electromagnet.

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

In FIGS. 1 to 6, reference numeral 1 denotes a motor, which is fixed to a mounting plate 2. As shown in FIG. The mounting plate 2 is attached to the main plate 4 with screws 3. A pulley 6 is press-fitted into the tip of the shaft 5 of the motor 1. 7 is a flywheel, into which a capstan shaft 8 and a gear 9 are press-fitted.

A central portion of the capstan shaft 8 is rotatably held by a bearing 10 fixed to the main plate 4. Further, the lower end portion is held in the longitudinal direction by a receiving plate 13 attached to columns 11a and 11b fixed to the main plate 4 with screws 12. A sun gear 14 has a pulley 15 on its outer periphery, and the pulley 15, the flyhole 7, and the pulley 6 of the motor 1 are connected by a rubber belt 16. A metal 17 is press-fitted into the center of the sun gear 14, and is rotatably held by a shaft 19 fixed to an auxiliary plate 18. A carrier 20 is rotatably inserted into the boss portion of the sun gear 14, has a gear 21 on its outer periphery, and has a shaft 22 protruding from its upper surface. 23 is a planetary gear, which is rotatably inserted into the shaft 22 of the carrier 20. One of the gear surfaces is the sun gear 1
4, and the other one meshes with the internal gear 24. The internal gear 24 has a gear 25 and a plurality of pawls 26 on its outer periphery. Further, a felt disk 28 adhered to the rocking plate 27 is rotatably in contact with the upper surface concave portion. The swing plate 27 is connected to the internal gear 24.
It is rotatably inserted into the boss provided in the
A compression spring 2 is placed in the circular recess at the center of this rocking plate.
9 has been inserted. This compression spring 29 is biased in the compression direction by a collar 30 that is press-fitted into the stepped boss of the internal gear 24. Shafts 31a and 31b are fixed to the tip of the swing plate 27, and rolling gears 32a and 32b are rotatably inserted therein.
The rolling gears 32a and 32b are the same as the gear 2.
It meshes with 5. Further, the internal gear 24 is rotatably inserted into the shaft 19, and the planetary gear 23, the carrier 20, and the sun gear 14 form a planetary gear reduction device. 33
is a supply reel shaft, which is mounted on the auxiliary plate 18. An intermediate gear 34 and a supply reel stand 37 are rotatably inserted into the supply reel shaft 33, respectively. The intermediate gear 34 has a small gear 35 and a large gear 36.
The large gear 36 meshes with the gear 21 of the carrier 20. The supply reel stand 37 has a gear 38 on its outer periphery, and is arranged to mesh with the rolling gear 32a when the singing plate 27 swings clockwise.
Further, a reel pawl 39 is press-fitted into the tip.
Reference numeral 40 denotes a take-up reel shaft, which is mounted on the auxiliary plate 18. A take-up reel stand 41 is rotatably mounted on this take-up reel shaft. This take-up reel stand 41 is composed of a gear 42 and a boss 43, and has a reel pawl 44 press-fitted into one end and a collar 45 press-fitted into the other end. The gear 42 is provided with a recess, and a felt 46 is inserted into the recess.
is inserted rotatably.

A gear 47 is also rotatably mounted on the boss 43 of the take-up reel stand, and is compressed against the felt 46 by a compression spring 48 biased in the compression direction by the collar 45. 49 is an electromagnet, which is attached to the main plate 4 with screws 50. This electromagnet 49 has a U-shaped core 5
A bobbin 53 on which a coil 52 is wound is attached to one side of the coil 1. Reference numeral 54 denotes an L-shaped locking lever, which is rotatably mounted on a shaft 55 set up on the main plate 4. A suction piece 56 is fixed to one end of the locking lever 54 at a position facing the U-shaped core 51 of the electromagnet 49, and the other end faces the pawl 26 provided on the outer periphery of the internal gear 24. A locking portion 57 protrudes at the position. Further, the locking lever 54 is biased counterclockwise by a torsion spring 58a, and is positioned by the locking portion 57 and a notch portion 58b provided in the main plate 4. A cam 59 is rotatably mounted on a shaft 60 mounted on the main plate 4. The cam 5
9 is composed of a head drive cam 61, a gear 62, a timing cam 63, and a positioning cam 64. The head driving cam 61 has a convex shape in the longitudinal direction, and the timing cam 63 protrudes from the gear 62 in the circumferential direction.
4 is configured to be concave inward in the circumferential direction from the gear 62. A transmission gear 65 is rotatably mounted on a shaft 66 mounted on the auxiliary plate 18, and its tooth surface meshes with the gear 35 of the intermediate gear 34 and the gear 62 of the cam 59, respectively. 67 is a detection switch A, and a detection piece 68 is connected to the cam 5.
9 is attached to the main plate 4 with screws 69 in such a manner that the contacts are closed by the rotation of the timing cam 63. Reference numeral 70 denotes a positioning lever, which is rotatably mounted on a shaft 71 mounted on the hand plate 4. A pin 72 protrudes from the tip of the positioning lever 70 so as to be inserted into the positioning cam 64 of the cam 59, and is biased counterclockwise by a torsion spring 73. Reference numeral 74 denotes an L-shaped head drive lever, which is rotatably mounted on a shaft 75a planted on the main plate 4.
One end of the head drive lever 74 has a rounded tip and is arranged so as to be in contact with the outer periphery of the head drive cam 61 of the cam 59, and a pin 75b is attached to the other end of the head drive lever 74, which is connected to the notch 76 of the main plate 4. It is protruded so as to penetrate through it. Reference numeral 77 is a head board, and guide pins 78a, 7 mounted on the main board 4
8b and 78c so as to be slidable back and forth. At the center of the head board is the swing plate 27.
It has a V-shaped notch 80 at a position opposite to the pin 79 planted at the tip. Also, a square hole 8 is provided which engages with a pin 75b protruding from the drive lever 74.
1. Reference numeral 82 designates a pinch roller arm having a U-shaped cross section, which is rotatably mounted on a shaft 83 mounted on the head 77, and biased counterclockwise by a torsion spring 84.
The tip of this pinch roller arm is bent into an L shape and engages with the head substrate 77. 8
Reference numeral 5 denotes an idler lever, which is rotatably mounted on a bearing 10 fixed to the main plate 4 and is disposed between the main plate 4 and the head board 77. 86 is an idler gear, and a shaft 87 is installed on the idler lever 85.
It is rotatably mounted on the fly hole 7, and its tooth surface meshes with a gear 9 fixed to the fly hole 7. The idler lever 85 is biased counterclockwise by a torsion spring 88, and the shaft 87 protruding from the idler lever 85 toward the head board 77 comes into contact with a linear side surface 89 of the head board 77. It is well located. A recess 90 is provided in the middle of this linear side surface 89. Reference numeral 91 denotes a detection pin, which passes through the elongated hole 92 of the main plate 4 and is set on the head substrate 77. This detection pin 9
The tip of the switch B93 presses the detection piece 94 of the detection switch B93 fixed to the main plate 4 with a screw 92, and maintains the contact in a closed state. Reference numeral 95 denotes a head driving torsion spring, which is rotatably attached to a shaft 96 set on the main plate 4, and one end of which is connected to the shaft 96 set on the main plate 4.
7, and the other engages with the head substrate 77 to urge it in the direction of arrow A. 98 is a recording/playback head, and 99a and 99b are cassette positioning pins. The auxiliary plate 18 is attached to pillars 100a, 100b, and 100c erected on the main plate 4 with screws 101.

Next, the operation of this embodiment will be explained. The state shown in FIG. 1 is the STOP state. To enter the PLAY state, first the motor 1 is rotated counterclockwise and the electromagnet 49 is energized. The rotation of the motor 1 is transmitted by a rubber belt 16 to a flywheel 7 and a sun gear 14 of a planetary gear reduction device.
On the other hand, by energizing the electromagnet 49, the adsorption piece 56
is attracted to the core 51, the locking lever 54 rotates clockwise against the torsion spring 58a, and the locking portion 5
7 engages with a pawl 26 provided on the outer periphery of the internal gear 24. Therefore, this internal gear 24 cannot rotate, and after the rotation of the sun gear 14 is transmitted to the planetary gear 23,
The signal is transmitted to the carrier 20. This carrier 2
0 rotates, the cam 59 rotates from the gear 21 provided on the outer periphery via the intermediate gear 34 and the transmission gear 65. When this cam 59 rotates, the positioning lever 70 is torsioned by the slope of the positioning cam.
3 and run clockwise. When the head drive lever 74 in contact with the maximum radius position of the head drive cam 61 is positioned corresponding to the minimum radius position of the head drive cam 61, the head drive torsion spring 95 biased via the head base plate 77 is released. The head substrate 77 rotates counterclockwise due to the bias, thereby moving the head substrate 77 in the direction of arrow A. At the same time as this head board 77 moves in the direction of arrow A, the positioning lever 70 again enters the recess next to the positioning cam, and the timing cam 63 closes the detection switch A67. When the electromagnet 49 is de-energized by the electric signal from the detection switch A67, the locking lever 54 is activated by the torsion spring 58a.
As a result, the engaging portion 57 and the claw 26 are disengaged from each other. Therefore, the rotation of the motor 1 is
The load is transmitted from the sun gear 14 to the internal gear 24, which has a light load, and the rotation of the cam 59 is stopped. When the head board 77 moves in direction A and stops, the recording/reproducing head 98 comes into contact with the tape and the pinch roller comes into contact with the capstan shaft 8. Further, since the shaft 87 mounted on the idler lever 85 comes off the linear side surface 89 of the head board 77, it enters the recess 90 under the force of the torsion spring 88, and the idler gear 86 meshes with the gear 47. The rotation of the capstan shaft 8 is transmitted to the take-up reel stand 4.

The internal gear 24 rotates when the electromagnet 49 is de-energized, and the swing plate 27 tries to swing due to the frictional force of the felt 28, but the V-shaped notch 80 of the head board 77 prevents the swing plate 27 from swinging. Since the pin 79 is restrained, the singing plate 27 remains in the neutral position and the rolling gears 32a, 32b do not mesh with the reel stand.

To return to the STOP state, the electromagnet 49 is energized again to stop the rotation of the internal gear 24, the carrier 20 is rotated, and the cam 59 is driven. This rotation of the cam 59 causes the head drive lever 74 to rotate clockwise against the head drive torsion spring 95, so that the head base plate 77 moves in the direction opposite to arrow A. As the head board 77 moves, the idler gear 86 and the gear 47 engage, the capstan shaft 8 and the pinch roller disengage, and the pin 79 disengages from the V-shaped notch 80, causing the detection switch B93 to disengage. Close the contacts.
If the electricity to the electromagnet 49 and the motor 1 is stopped by the electric signal of the detection switch B93,
The state becomes STOP.

To enter the REW state, if the motor 1 is rotated counterclockwise from the STOP state, the rotation is transmitted from the sun gear 14 to the planetary gear 23, the internal gear 24, and the rolling gears 32a and 32b. As the internal gear 24 rotates, the singing plate 27 rotates toward the supply reel stand 37 due to the frictional force generated by the felt 28 and the compression spring 29. Therefore, the rolling gear 32a
meshes with the gear 38 and drives the reel stand 37. To enter the FF state, rotate the motor 1 clockwise so that the swing plate 27 moves toward the take-up reel stand 4.
1 side, the rolling gear 32b meshes with the gear 42, and drives the take-up reel stand.

As described above, according to the tape recorder drive device of the present invention, by using a planetary gear system, a logic-controlled cassette mechanism can be realized with a configuration of one motor, one small electromagnet, etc. Many functions can also be added. In addition, the mechanism and control circuit are simplified, the number of parts is small, the device can be made smaller, thinner, and lighter, and it has many features such as sufficient operation even at low voltage and low current consumption. Therefore, it is most suitable for battery-powered portable logic control type tape recorders.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG.
A plan view showing the STOP state, Fig. 2 is a sectional view of the planetary gear device, Fig. 3 is a sectional view of the reel stand, Fig. 4 is a sectional view of the cam section, Fig. 5 is a side view, and Fig. 6 is a front view. 7 are plan views showing the PLAY state. 1 is a motor, 14 is a sun gear, 20 is a carrier, 23 is a planetary gear, 24 is an internal gear, 26 is a pawl,
51 is an electromagnet, 54 is a stop lever, 59 is a cam,
74 is a head drive lever, 77 is a head board, 8
4 is a head drive torsion spring.

Claims (1)

[Claims] 1 The rotation from the motor is transmitted to the sun gear of the planetary gear device, the first output measurement of the planetary gear device is transmitted to the transmission system that drives the reel stand, and the second output side is transmitted to the cam drive system that drives the head board. A drive device for a tape recorder, wherein the drive device is connected to transmit rotation to each of the head boards, and applies a load to the first output side when operating the head board.