JPH0650830Y2 - Tape coder drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a drive mechanism of a tape recorder, and more specifically, a take-up reel stand is a power transmission mechanism for rotationally driving a supply reel stand at high speed or low speed. Regarding improvement.

<Prior art> Conventionally, while driving the reel stand of a tape recorder,
The rotation is done via a belt hanging between the motor and the pulley, and in order to rotate at low speed, the rotation of the motor is further reduced by a low speed mechanism such as a gear or pulley, and transmitted to the reel stand. . Further, in order to rotate the reel stand at a high speed, a position of a pulley driven via a belt is moved separately from the speed reduction mechanism.

<Problems to be solved by the invention> However, the above-mentioned conventional method requires a large number of gears and pulleys for slowing down the rotation of the motor for low speed rotation, has a large number of parts, and has a complicated power transmission mechanism. there were. Also, in high-speed rotation, when transmitting power to the take-up reel base and the supply reel base, the position of the main drive pulley in contact with the belt moves, which causes the belt tension to fluctuate, resulting in uneven rotation. Was.

<Means for Solving Problems> The present invention is designed to rotate when a rotational force is transmitted from a motor and a screw gear is formed at a base end portion of the driving pulley, and to rotate the driving pulley. A first rotating member that is rotated and is rotatably provided in the take-up reel base direction or the supply reel base direction in accordance with the rotation direction of the main drive pulley; and the main pulley also rotates. A second rotating member which is rotatably moved in the take-up reel base direction or the supply reel base direction according to the rotating direction of the main drive pulley, and the first rotating member. A threaded gear that meshes with the threaded gear of the main driving pulley is formed in the state in which the first rotary member is rotated by the rotation of the main driving pulley. Thus, the power transmission shaft formed with a worm that transmits the rotational force of the main drive pulley to the take-up reel base or the supply reel base to drive one of the reel bases at low speed, and the second rotating member. In the state in which it is provided, it is adapted to be in rolling contact with the main drive pulley, and with the rotational movement of the second rotary member based on the rotation of the main drive pulley, the take-up reel stand or the supply reel stand is provided with the above-mentioned structure. Transmits the rotational force of the drive pulley,
When one of the first or second rotating members performs the rotating movement, the driven pulley that drives any one of the reel stands at high speed does not rotate the other rotating member. It is provided with a regulation means for regulating.

<Operation> When the first rotation member rotates in the take-up reel base direction or the supply reel base direction with the rotation of the main drive pulley, the power transmission shaft is rotated by the screw gear to rotate the main drive pulley. The force is transmitted to the take-up reel table or the supply reel table via the worm, and either reel table is driven at a low speed. At this time, the rotation of the second rotating member is restricted by the restricting means.

When the second rotating member rotates in the take-up reel stand direction or the supply reel stand direction in accordance with the rotation of the main drive pulley, the driven pulley causes the rotational force of the main drive pulley to change to the take-up reel stand or the supply reel. It is transmitted to the table, and either reel table is driven at high speed. At this time, the rotation of the first rotating member is restricted by the restricting means.

<Embodiment> Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

First, FIG. 1 (a) is a schematic front view of a main part of a tape recorder drive mechanism of the present invention, in which reference numeral 2 is a motor, 3 is a pulley press-fitted into the shaft of the motor 2, and 4 and 5 are A flywheel in which the capstan shafts 4'and 5'are press-fitted in the center, respectively, 11 is a main drive pulley, and a belt 18 is hung between them so that they can be simultaneously driven to rotate. The fulcrum shaft 12 of the main drive pulley 11 supports a rotating horizontal plate (first rotating member) and a rotating vertical plate (second rotating member) so that they can swing. The rotating horizontal plate 10 has a power transmission shaft 14 having worms 14a and 14c and a screw gear 14b.
15 and 15 are rotatably attached, and a driven pulley is rotatably attached to the rotating vertical plate 9 by a shaft 13 'in a state where the driven pulley 11 and the outer peripheral portion are in contact with each other. 16,17
Shows a take-up reel stand and a supply reel stand which are rotatably mounted on shafts 16 'and 17', respectively, and 16a and 16b, 17a and 17b show respective reel stand outer circumferences and worm wheels. 6,8
Is a high-speed feed lever, 7 is a play lever, and 6 ',
Reference numerals 8'and 7'indicate engaging protrusions provided at the respective tips.

Incidentally, 9'is an engaging groove formed in the rotating vertical plate 9, and 10 ', 1
Reference numeral 0'indicates an engaging groove formed in the rotating horizontal plate 10.

FIG. 1 (b) is a right side view of FIG. 1 (a). As shown in the drawing, the driving pulley 11 and the power transmission shaft 14 are arranged orthogonally to each other, and are formed on the rotary shaft 11a of the driving pulley 11. Screw gear 1
1b meshes with the screw gear 14b of the power transmission shaft 14 to transmit the rotation of the driving pulley to the power transmission shaft.
Reference numeral 1 in the drawing indicates a main chassis to which these are attached.

Next, the operation of the tape recorder drive mechanism of the present invention having the above construction will be described with reference to FIGS.

First, FIG. 2 shows a state in which the take-up reel stand 16 is rotated at a high speed. When the motor 2 is rotated counterclockwise and the belt 18 is driven by the pulley 3 attached to the shaft of the motor 2, the outside of the belt 18 is shown. The driving pulley 11 in contact with is rotated to the right. At this time, the rotating horizontal plate 10 and the rotating vertical plate 9 also receive the force of rotating in the right direction, but the high-speed feed lever 6 is pushed in and the engaging projection 6'at the tip end of the swing horizontal plate 10
Since it is engaged with the engaging groove 10 ″ of the driven pulley, the swinging horizontal plate 10 does not rotate to the right, but only the rotating vertical plate 9 rotates to the right, and the driven pulley attached to the tip portion. 13 is in contact with the peripheral edge portion 16a of the take-up reel stand 16. Since the driven pulley 13 has its outer peripheral surface in contact with the driving pulley 11 and is driven to rotate, the rotation of the driving pulley 11 rotating to the right is Driven pulley 13
Is transmitted to the take-up reel stand 16 via the
Is to rotate to the right at high speed.

Next, as shown in FIG. 3, only the high-speed feed lever 8 is pushed in to engage the engaging projection 8'of the tip end with the engaging groove 10 'of the rotating horizontal plate 10 to move the swinging horizontal plate 10 to the left. When the motor 2 is rotated clockwise with the rotation of the
It is transmitted to the driving pulley 11 via 18 and the driving pulley 11
While rotating 11 to the left, the rotating vertical plate 9 is also rotated to the left. Therefore, the driven pulley 11 attached to the tip of the rotating vertical plate 9 comes into contact with the driving pulley 11, and the driven pulley 13 which is driven to rotate comes into contact with the peripheral edge portion 17a of the supply reel base 17, and the supply reel base 1
It rotates 7 to the left at high speed.

Next, the operation of the drive mechanism when the play lever 7 is operated to rotate the reel base at a low speed will be described with reference to FIGS. 4 and 5.

The low speed rotation is performed with the play lever 7 pushed in, the engagement protrusion 7'at the tip end is engaged with the engagement groove 9'of the rotating vertical plate 9, and the rotation of the rotating vertical plate 9 is blocked. Depending on the rotating direction of the motor 2, the drive switching between the take-up reel stand 16 and the supply reel stand 17 is performed.

FIG. 4 shows the drive state of the take-up reel stand 16. By rotating the motor 2 clockwise, the drive pulley 11 is rotated counterclockwise via the belt 18. At this time, the rotating horizontal plate 10 also receives a force to rotate to the left, and the worm 14a at the tip of the power transmission shaft 14 attached to the rotating horizontal plate 10 rotates to a position where it engages with the worm wheel 16b of the take-up reel base 16. Move. The power transmission shaft 14 has a screw gear 14b in the central portion meshing with a screw gear 11b formed on the rotating shaft 11a of the driving pulley 11, so that the power transmission shaft 14 rotates clockwise when viewed from the right side and is provided coaxially. Warm 14a
Take-up reel stand 1 integrated with worm wheel 16b via
Rotate 6 to the left at low speed.

FIG. 5 shows the driving state of the supply reel base 17. Contrary to the above, the motor 2 is rotated counterclockwise, the main drive pulley 11 is rotated clockwise, and the swinging lateral plate 9 is also rotated clockwise to generate power. The worm 14c provided on the left end side of the transmission shaft 14 is supplied to the reel base 1
By engaging with the worm wheel 17b of 7, the supply reel base 17 is rotated rightward at a low speed.

As described above, the present invention provides the rotating vertical plate 9 and the driven pulley 13 for high speed rotation, the rotating horizontal plate 10 and the transmission drive shaft for low speed rotation.
Since 14 is configured to be driven only by the drive pulley,
The drive mechanism of the tape recorder can be extremely simplified.

<Effect of the Invention> As described above, in the tape recorder drive mechanism of the present invention, the first rotating member for low speed driving and the power transmission shaft, and the second rotating member for high speed driving and the driven pulley are common. Since it is configured to be driven by the rotational force of the main drive pulley, it has an effect that the mechanism for high speed drive and low speed drive of the tape recorder can be extremely simplified.

[Brief description of drawings]

FIG. 1 (a) is a schematic front view of an essential part showing an embodiment of the present invention, FIG. 1 (b) is a right side view of the same as above, and FIGS. FIG. 2 is a schematic front view of a part, FIG. 2 is a state in which a take-up reel base is rotated at high speed, FIG. 3 is a state in which a supply reel base is rotated at high speed, and FIG. 4 is a state in which a take-up reel base is rotated at low speed. FIG. 5 shows a state in which the supply reel base is rotated at a low speed. 1 ... Main chassis, 2 ... Motor 3 ... Pulley, 4,5 ... Flywheel, 4 ', 5' ...
… Capstan shaft, 6,8 …… High speed feed lever, 7 …… Play lever 9 …… Rotating vertical plate, 10 …… Rotating horizontal plate 11 …… Main drive pulley, 11a …… Rotating shaft 11b, 14b …… Screw gear, 12 ...... fulcrum shaft 13 …… driven pulley, 14 …… power transmission shaft 14a, 14c …… worm, 16 …… take-up reel stand 17 …… supply reel stand, 16a, 17a …… peripheral edge of reel stand , 16
b, 17b …… Warm wheel, 18 …… Belt

Claims (1)

[Scope of utility model registration request] 1. A drive pulley which is rotated by transmitting a rotational force from a motor and which is formed with a screw gear at a base end thereof, and which is rotated with the rotation of the drive pulley. A first rotating member rotatably provided in a take-up reel base direction or a supply reel base direction according to a rotating direction of the main drive pulley, and a member which is also rotated in accordance with the rotation of the main drive pulley. And a state provided on the first rotating member and a second rotating member that is rotatably provided in the take-up reel base direction or the supply reel base direction according to the rotating direction of the main drive pulley. A threaded gear that meshes with the threaded gear of the main drive pulley is formed, and the take-up reel stand is accompanied by the rotational movement of the first rotary member based on the rotation of the main drive pulley. Is a power transmission shaft formed with a worm that transmits the rotational force of the main drive pulley to the supply reel base and drives one of the reel bases at a low speed, and the main shaft is provided in the second rotating member. The rolling member is adapted to be in rolling contact with the pulley, and the rotary motion of the second rotary member based on the rotation of the driving pulley causes
A driven pulley that transmits the rotational force of the main driving pulley to the take-up reel base or the supply reel base to drive any one of the reel bases at high speed, and one of the first and second rotating members. A tape recorder drive mechanism, comprising: a restricting unit that restricts the rotation of the other rotating member when the moving member performs the above-described rotating movement.