JPS62298958A - Reel base driving device - Google Patents

Abstract

PURPOSE:To surely switch the mode by drawing a guide shaft, which is provided on an idler base having an idler gear, into a longitudinal groove constituting a guide groove in the mode switching process to place the rotation center of the idler gear on a bisector of the segment connecting rotation centers of a pair of reel gears. CONSTITUTION:When a pin 18 rides on a cam face 17a of a rotating cam 17 in the stop mode or the pause mode, a turning arm 14 is greatly turned counterclockwise against the energizing force of a spring 16. In this state, an idler base 8 is pulled up by a slider 10 and a guide shaft 21 provided on the idler base 8 is drawn into a guide groove 19a constituting a guide groove 19 to position the rotation center of an idler gear 6 on the bisector of the segment connecting rotation centers of a pair of reel gears 4 and 5. Consequently, the idler gear 6 is placed in the middle position between a pair of reel gears, and the idler gear stably follows up the rotation direction of a driving gear when it is operated in response to the next mode command.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Industrial Application Field The present invention is used in reel-to-reel type cassette tape recorders such as compact cassette tape recorders, video cassette tape recorders, and digital audio cassette tape recorders. This invention relates to a reel stand driving device.

2. Description of the Related Art In general, a reel stand driving device in a reel-to-reel type cassette tape recorder has a supply reel stand and a take-up reel stand that respectively engage a pair of reel knobs of a tape cassette. An idler gear constituting a swing mechanism is connected to each reel gear of the take-up reel stand, and a gear coaxial with the relay pulley is always engaged with the drive gear meshed with the idler gear, and the relay pulley is connected to the drive gear through a belt. It was configured to transmit the rotational force of a motor that can be rotated and reversed. In this case, forward rotation,
The speed of the reversible motor is set so that it can be used for both constant-speed and high-speed tape running, and when the motor rotates at constant speed, the idler gear is brought into contact with the take-up reel and nine reel gears to achieve the above-mentioned speed. Constant-speed running mode was achieved by using the motor shaft as a capstan and pressing the tape against it using pinch rollers. On the other hand, during high-speed forward rotation and high-speed reversal of the motor, the pinch roller is separated from the capstan, and during high-speed forward rotation, the idler gear is brought into contact with the reel gear on the take-up reel stand, and during high-speed reversal, the idler gear is brought into contact with the reel gear on the supply reel stand. This enabled high-speed driving mode. On the other hand, the swing mechanism has a relationship in which the rotation center of the drive gear is placed on the bisector line passing through the midpoint of the line segment connecting the rotation centers of the reel gears of each of the take-up reel stand and the supply reel stand. An idler gear is arranged at the free end of a rocking plate having a guide shaft that moves the idler gear, and the idler gear applies a spring biasing force in the biting direction to the reel gear and drive gear of the take-up reel stand, and the reel gear and drive gear of the supply reel stand. The idler gear is configured to be in rolling contact with the reel gear and drive gear of the take-up reel stand, or with the reel gear and drive gear of the supply reel stand, depending on the rotational direction of the drive gear.

Problems to be Solved by the Invention However, in the conventional device, the swinging mechanism for switching and transmitting the rotational force of the motor to the reel stand has an idler gear at the free end, and a line segment connecting the rotation centers of each reel gear. 2
Since the spring biasing force is simply applied to the rocking plate where the guide shaft moves on the equal dividing line, the rocking plate is not necessarily positioned exactly at the neutral position of each glue + Lugya during the mode transition process. For example, if the swing plate is not in the neutral position when the idler gear is separated from each reel gear and drive gear in pause mode, it is difficult to transition from Bose mode to constant speed mode, fast forward mode, or return mode. had.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a reel stand drive device in which an idler gear stably follows the rotational direction of a drive gear.

Means for Solving the Problems In order to solve the above problems, the reel stand drive device of the present invention has a rotation center on the bisector of a line segment connecting the rotation centers of a pair of reel gears, and the rotational force of the motor. a drive gear that is rotated by receiving the signal; a substantially inverted T-shaped guide groove consisting of a vertical groove along the bisector line and a horizontal groove perpendicular to the bisector line; and a vertical groove constituting the guide groove. A slider that can move linearly along the axis and has a rotary arm loosely fitted thereto, and a guide shaft that is rotatably supported by the slider and coaxial with a gear shaft that rotatably supports an idler gear at its free end. an idler pace that is movable along a horizontal groove forming a groove; a spring biasing member that applies a spring biasing force to the rotating arm so that the idler gear bites into the reel gear and the drive gear; and a biasing force of the spring biasing member. A rotating cam is provided for rotating the rotating arm so as to separate the idler gear from the reel gear and the drive gear against a force, and when the idler gear is separated from the reel gear and the drive gear by the rotating cam, the idler gear The guide shaft provided in the idler pace is inserted into the vertical groove constituting the guide groove so that the rotation center of the reel gear is located on the bisector of the line segment connecting the rotation centers of the pair of reel gears. It is characterized by the fact that

According to the above-described configuration, the guide shaft provided in the idler pace having the idler gear enters the vertical groove constituting the guide groove in the process of mode transition, and the rotation center of the idler gear is aligned with the rotation center of the pair of reel gears. It is located on the bisector of the line segment connecting the centers, and the rotation centers of the drive gear and the idler gear can be aligned with respect to the bisector. Therefore, the idler gear is positioned at the neutral position of the pair of reel gears or the neutral position of the υ drive gear, and when transitioning from pause mode to constant speed mode, fast forward mode, or return mode, the idler gear This means that it can be stably transferred to either one of the pair of reel gears depending on the rotational direction of the drive gear.

Embodiments Hereinafter, a reel stand driving device of the present invention will be explained with reference to drawings of embodiments.

FIGS. 1 to 3 show an embodiment of the reel stand driving device of the present invention, and show a system in a remand mode.

1, 2, and 3, 1 is a supply reel stand, 2 is a take-up reel stand, and each of these reel stands is engaged with a pair of reel hubs of a digital audio tape cassette 3.

The supply reel stand 1 and the take-up reel stand 2 each have coaxial reel gears 4 and 5, and a drive gear is located on a line passing through the midpoint of a line segment connecting the rotation centers of each of these reel gears 4 and 5. 7, and an idler gear 6 is connected to the reel gear 4 and the drive gear 7 or the reel gear 5 and the drive gear 7. The idler gear 6 is rotatably supported on an idler base 8 by a gear shaft 9. The idler base 8 above is slider 1
0 rotatably supported by a shaft 11, and the shaft 1
A friction spring 12 disposed coaxially with the slider 1 is pressed against the slider 1 and is frictionally connected to the slider 1°. The slider 1° has a shaft 13 at one end,
A long hole 14a is provided in this shaft 13 at one end of the rotating arm 14.
are loosely fitted. The rotating arm 14 is rotatable around a support shaft 16, and has a spring 1 installed between it and the fixed end.
6 to rotate clockwise. Reference numeral 17 denotes a rotating cam, which has a cam surface 17a that comes into contact with the bin 18 provided on the rotating arm 14.

19 is a substantially inverted T-shaped guide groove provided on the substrate 22;
A vertical groove 19a arranged along the bisector of a line segment connecting the rotation centers of the pair of reel gears 4 and 6;
The horizontal groove 19b is perpendicular to the horizontal groove 19b. By fitting a guide 20 protruding from the lower surface of the slider 10 into the vertical groove 19a of the guide groove 19, the slider 10 is guided so as to be linearly movable. On the other hand, the guide groove 19
A guide shaft 21 protruding from the lower surface of the idler base 8 coaxially with the shaft 9 of the idler gear 6 is fitted into the lateral groove 19b of the idler base 8, so that the idler base 8 is connected to the shaft 1.
It is guided so as to be rotatable around 1. At the tip of this idler base 8 is a switching pawl 2 coaxial with the drive gear 7.
It has a protrusion 24 that engages with 3.

Here, the rotating arm 14, to which a biasing force in the time direction is applied by the spring 1θ, moves the idler gear 8 between the pair of reel gears 4 due to the relationship between the bin 18 provided thereon and the cam surface provided on the outer surface of the rotating cam 17. 5 and drive gear 7, and when the bottle 18 is in a position away from the cam surface 7a, it is in constant speed mode or high speed mode, and the bottle 18 is in the constant speed mode or high speed mode. When the robot is in the position where it is on top of the vehicle, it is in the stop mode or pause mode. Then, in the process of the idler gear 6 being transferred between the reel gears 4 and 5, the bottle 18 is lifted onto the inclined surface of the cam surface 17a. In other words, the rotary cam 17 kicks the pin 18 with the cam surface 17a in accordance with the mode transition, and rotates the rotary arm 14 against the biasing force of the spring. 28 is a relay pulley, which has a gear 29 coaxially meshing with the drive gear 7 at all times. Reference numeral 30 denotes a motor capable of rotating two ball shafts, and the motor shaft 31 functions as a capstan to which the tape 3a pulled out from the tape cassette 3 is pressed by a pinch roller (not shown). A belt 33 is installed between a pulley 32 provided on the motor shaft 31 and the relay pulley 28.

Reference numeral 26 denotes a cylinder, on which the tape 3a pulled out from the tape cassette 3 by a tape loading mechanism (not shown) is wound at a predetermined angle, and the magnetic tape is loaded by a rotary head (not shown) rotating inside the cylinder 26. Signals are recorded and played back. Reference numerals 37 and 38 denote a pair of inclined posts forming a part of the tape loading mechanism, and 39 and 40 a guide roller forming a part of the tape loading mechanism. 41 and 42 are fixed guide rollers, and 43 is a guide roller moved in cooperation with the tape loading mechanism, which transports the tape 3a to a position where it approaches the motor shaft 31 as a capstan in the tape constant speed mode. , in the tape high-speed mode, the motor shaft 3 uses the tape 3a as a capstan.
1 to a position away from it.

In such a configuration, assuming that the motor 30 is currently in the forward rotation constant speed mode, the motor 30 is rotated in the direction of the arrow shown in the figure and the feeding direction.
The relay pulley 28 is rotated in the same direction via the belt 33, and the drive gear 7 is rotated clockwise. Therefore, the swinging mechanism including the idler gear 6 is rotated counterclockwise, and the idler gear 8 is engaged with the reel gear 6 of the take-up reel stand 2.

Therefore, the take-up reel stand 2 is rotated clockwise via the drive gear 7° and the idler gear 6. On the other hand, in the high-speed feed mode, the motor 3o is similarly rotated in the direction opposite to the arrow shown in the figure, and the take-up reel stand 2 is driven to rotate clockwise at high speed.

Conversely, if the motor is in the reverse constant speed mode or the high speed rewind mode, the motor 30 is similarly rotated in the direction of the arrow shown in the figure.
The relay 7'-relay 28 is rotated in the direction of the arrow shown in the figure via the timing belt 13, and the drive gear 7 is rotated counterclockwise. Therefore, the swinging mechanism including the idler gear 6 is rotated clockwise to engage the idler gear 6 with the reel gear 4 of the supply reel stand 1. Therefore, the supply reel stand 1 is rotated counterclockwise via the drive gear 7 and the idler gear 6.

When changing from a normal rotation state to a reverse rotation state, or from a reverse rotation state to a normal rotation state, the pin 18 of the rotation arm 14 is pressed against the slope of the cam surface 17a provided on the rotation cam 17, as shown in FIG. The rotation arm 14 is rotated slightly counterclockwise against the biasing force of the spring 16. In this state, the biting force of the idler gear 6 on the reel gear 4 or 5 is small, and the guide shaft 21 of the idler pace 8 is
is located within the lateral groove 19b of the guide groove 19.

Therefore, due to the rotation of the idler gear 6 which is meshed with the drive gear 7 which is rotated according to the rotational direction of the motor 3o, the idler pace 8 having the idler gear 6 rotates around the shaft 11 which is connected to the shaft 11 in a massed manner by the friction spring 12. and the protrusion 24 at the tip of the idler pace 8
is engaged with the switching pawl 23 provided coaxially with the drive gear 7, and the idler pace 8 is also rotated by the switching pawl 23 as the idler gear 6 is rotated by the drive gear 7, and the idler pace 8 is rotated by the switching pawl 23. The idler gear 6 that is pivotally supported can be switched. At the end of this switching, the rotary cam 17 returns to its original position and the biasing force of the spring 16 acts to cause the idler gear 6 to bite into the reel gear and drive gear.

On the other hand, in the stop mode or pause mode, when the pin 18 rides on the cam surface 17a of the rotating cam 17 and is raised, the rotating arm 14 moves counterclockwise largely against the biasing force of the spring 16, as shown in FIG. Rotated. In this state, the idler pace 8 is pulled up by the slider 10, and the guide shaft 21 provided on the idler pace 8 is moved into the guide groove 19.
The center of rotation of the idler gear 6 is positioned at the bisector of the line segment connecting the centers of rotation of the pair of reel gears 4 and 6.

Therefore, when the idler gear 6 is located at the neutral position of the pair of reel gears 4 and operates in response to the next mode command, it can be stabilized and partially rotated in the rotational direction of the drive gear 7.

Effects of the Invention As described above, according to the present invention, in the process of mode transition, the guide shaft provided on the idler pace having the idler gear is drawn into the vertical groove constituting the guide groove, and the rotation center of the idler gear is aligned with the pair of wheels. Since the idler gear is located on the bisector of the line connecting the rotation centers of the two gears, the rotation centers of the idler gear and the drive gear can be aligned with respect to the bisector, and the idler gear is positioned at the neutral position of the drive gear. can do. Therefore, when the idler gear is operated from the pause position in response to the next mode command, the idler gear is stably switched according to the rotational direction of the drive gear, and the reel stand drive device that enables reliable mode transition is used. It can be realized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts showing an embodiment of the reel stand driving device of the present invention, FIG. 2 is a sectional view of essential parts of the device, FIG. 3 is an overall plan view of the device, and FIG. 4 and FIG. 5 is an explanatory diagram of the operation of the device. 4.5... Reel gear, 6... Idler gear, 7... Drive gear, 8... Idler base, 10... Slider, 12 ...
... Friction spring, 14 ... Rotating arm, 16 ... Spring, 17 ... Rotating cam,
21... Guide shaft. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 %

Claims (2)

[Claims] (1) A drive gear that has its rotation center on the bisector of a line connecting the rotation centers of a pair of reel gears and is rotated by receiving the rotational force of the motor, a vertical groove along the bisector, and the above-mentioned two. A roughly inverted T-shaped guide groove consisting of horizontal grooves perpendicular to the equal dividing line, a slider capable of linear movement along the vertical groove constituting the guide groove and having a rotation arm loosely fitted therein; an idler base that is movably supported and has a guide shaft coaxial with a gear shaft that rotatably supports an idler gear at a free end and is movable along a lateral groove forming the guide groove; a spring biasing member that applies a spring biasing force to the arm so as to bite into the arm;
The rotary cam rotates the rotary arm so as to separate the idler gear from the reel gear and the drive gear against the biasing force of the spring biasing member, and the rotary cam rotates the idler gear away from the reel gear and the drive gear. When the rotation center of the idler gear is located on the bisector of the line segment connecting the rotation centers of the pair of reel gears, the guide shaft provided on the idler base is inserted into the vertical groove forming the guide groove. A reel stand driving device characterized in that the reel stand is inserted into the reel stand. (2) Claim 1, characterized in that the idler base has a protrusion that engages with a switching pawl provided coaxially with the drive gear during the process of swinging in accordance with the rotational direction of the drive gear. The reel stand drive device described.