JPH0650829Y2 - Drive transmission mechanism in tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a drive transmission mechanism for transmitting a rotational drive force to a reel hub drive shaft in a tape recorder.

[Outline of device]

According to the present invention, a forward / reverse high-speed rotating body is provided on one of the front and back surfaces of the mechanical chassis, and a forward / reverse constant-speed rotating body is provided on the other side, and the rotary drive is performed from both rotating bodies to the reel hub drive shaft via the intermediate rotating body. In a tape recorder that is designed to transmit force, the intermediate rotating body is formed to be long in the axial direction so that it can be commonly used by both rotating bodies, and the mechanical chassis penetrates both the front and back sides and always rotates in conjunction with the reel hub drive shaft. The intermediate rotary body is shared by the high-speed rotary body and the constant-speed rotary body by axially supporting the rotary body.

[Prior Art] Conventionally, in a reverse type tape recorder, in order to drive one reel hub drive shaft to rotate in the opposite direction at a high speed and at a constant speed, an FF / REW switching gear as a forward / reverse high-speed rotating body is provided on the front surface side of the mechanical chassis. And a FWD / REV switching gear as a forward / reverse constant-speed rotating body is arranged on the back surface side, and the rotational force is transmitted to the reel hub drive shaft via separate intermediate gears.

[Problems to be solved by the invention]

Thus, in the conventional configuration, the FF / REW switching gear and FWD /
Since each REV switching gear corresponded to a separate intermediate gear, bearings for intermediate gears had to be installed on both the front and back sides of the mechanical chassis, and this bearing installation has location restrictions due to the relationship with other members. At the same time, there was a problem in position accuracy, which was a problem in design. In addition, the use of such separate intermediate gears has a large number of members, complicates the structure of the rotational force transmission mechanism, requires labor for assembling, and is costly.

In view of this point, the present invention provides a drive transmission mechanism for a tape recorder in which the structure of the rotational force transmission mechanism is simplified by sharing the intermediate rotating body.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention arranges a forward / reverse high-speed rotating body to which a rotational force is transmitted from a high-speed drive rotating body on one surface side of the mechanical chassis, on one surface side of the mechanical chassis.
A forward / reverse constant-speed rotating body to which the rotational force is transmitted from the constant-speed drive rotating body is arranged on the other surface, and the forward / reverse high-speed rotating body and the forward / reverse constant-speed rotating body respectively rotate to the reel hub drive shaft via the intermediate rotating body. In a tape recorder configured to transmit driving force,
The intermediate rotator is formed to be long in the axial direction so that it can be commonly used by the forward / reverse high-speed rotator and the forward / reverse constant-speed rotator, and the mechanical chassis penetrates both the front and back sides to rotate with the reel hub drive shaft at all times. By pivotally supporting the intermediate rotating body, the intermediate rotating body is commonly used for the forward / reverse high-speed rotating body and the forward / reverse constant-speed rotating body.

[Action]

In this way, the intermediate rotor corresponding to the reel hub drive shaft is configured to be shared by the forward / reverse high-speed rotor and the forward / reverse constant-speed rotor, whereby the positional accuracy of the intermediate rotor is secured
Rotational force is reliably transmitted from the forward / reverse high-speed rotating body and the forward / reverse constant-speed rotating body to the reel hub drive shaft, which eliminates the possibility that noise may occur and the tape running speed may be adversely affected such as fluctuations in performance.

〔Example〕

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

The tape recorder of this example is a reverse machine, and (1),
(2) is a reel hub drive shaft and is rotatably supported by bearings (4) and (5) which are outsert-molded in the mechanical chassis (3), and one drive shaft (1) is provided with a gear (1a). The lever gear (1a) is located on the surface side of the mechanical chassis (3), and the other drive shaft (2) is provided with upper and lower two-stage gears (2a) and (2b) in the axial direction. (2a) is located on the front side of the mechanical chassis (3), and the lower gear (2b) is located on the back side.

(6) and (7) are left and right capstans pivotally mounted on flywheels (8) and (9), and gears (10) and
(11) is fixed, and a rotational force transmission mechanism (12) including a rotating body is arranged between the right capstan (7) and the reel hub drive shafts (1) and (2).

This rotational force transmission mechanism (12) has an intermediate gear (13) as an axially long intermediate rotor meshing with the gear (1a) of one reel hub drive shaft (1) from the front side of the mechanical chassis (3). A bearing (14) that penetrates the back side and is outsert-molded in the mechanical chassis (3) supports the shaft, and on the front side of the mechanical chassis (3), the upper half of the intermediate gear (13) and the other reel hub drive shaft. (2) Fast forward (FF) / rewind (RE) as a forward / reverse high-speed rotating body between the upper gear (2a)
W) A switching gear (hereinafter referred to as a FR gear) (15) is provided on the back side between the lower half of the intermediate gear (13) and the lower gear (2b) of the other reel hub drive shaft (2). A constant speed forward feed (FWD) / reverse feed (REV) switching gear (hereinafter referred to as NR gear) (16) as a constant speed rotating body is separately arranged to be swingable, and an FR gear (15) A high-speed limiter gear (18) of an FR pulley (17) as a high-speed drive rotating body is meshed with the.

On the other hand, in the NR gear (16), a slip member (20) made of, for example, felt is added to the constant speed gear (19) as a constant speed driving rotating body.
Constant speed limiter gear (21) of a rotation slip mechanism configured by coaxially incorporating constant speed limiter gears (21)
The reduction gear (22) meshes between the constant speed gear (19) and the gear (11) of the right capstan (7), that is, the large diameter tooth portion (22a) of the reduction gear (22). Is meshed with the gear (11) on the capstan (7) side, and the small diameter tooth portion (22b) is meshed with the constant speed gear (19). Also, between the left flywheel (9) and the FR pulley (17), the endless belt (2
3) is hung to directly transmit the rotation of the flywheel (9) to the FR pulley (17), and the left and right capstans (6) and (7) are against the flywheel (8) and (9). The motors (24) are rotated in opposite directions by endless belts (26) which are inverted and wound around the pulleys (25) of the motor (24).

A stop lever (27) having a locking tooth (27a) formed on the front end side is provided at a portion of the rotational force transmission mechanism (12) configured as described above with respect to the constant speed limiter gear (21). It is pivotally attached to the chassis (3) by a shaft pin (28) so as to be rotatable in the contacting and separating directions with respect to the (21), and on a side portion opposite to the engaging tooth (27a) in front of the shaft attaching portion. A tension coil spring (29) is stretched between the projecting arm (27b) and the chassis (3) to engage the stop lever (27) with the locking tooth (27a) meshing with the constant speed limiter gear (21). Biased to do.

A pose slider (30) is engaged with the rear end of the stop lever (27), and the pose slider (30)
Is urged by the tension coil spring (29) having a large biasing force by the tension coil spring (29) described above, and the stop lever (27) is pressed against the biasing force of the tension coil spring (29) described above to rotate. Thus, the locking teeth (27a) are biased and held so as to be separated from the constant speed limiter gear (21). The stop lever (27) and the pause slider (30) constitute a locking operation mechanism.

The rotational force of the right capstan (7) by the motor (24) is transmitted to the reel hub drive shafts (1) and (2) via the rotational force transmission mechanism (12) configured as described above, and is rotated.

That is, when the tape runs at a constant speed, for example, the NR gear (16) is switched to the reel hub drive shaft (2) side on the right side, and when it is meshed with the gear (2b) on the lower stage, the rotational force of the capstan (7) is changed to that gear ( 11) is transmitted from the reduction gear (22) to the constant speed gear (19), and the rotational force of this gear (19) is transmitted to the constant speed limiter gear (21) by the frictional force of the slip member (20), The NR gear (16) meshing with the limiter gear (21) is rotated to drive the right reel hub drive shaft (2), and the tape is run at a constant speed in the forward direction (FWD) for recording and reproduction.

When the NR gear (16) is switched to the left reel hub drive shaft (1) side and meshed with the intermediate gear (13), the rotational force of the NR gear (16) is rotated in the same manner as described above, and the intermediate gear (16) is rotated. 1
3), the left reel hub drive shaft (1) is reversely driven via the gear (1a) meshed with the intermediate gear (13), and the tape runs in the reverse direction (REV) at a constant speed, that is, reverse. It is driven to record and reproduce.

With the reel hub drive shafts (1) and (2) pivoting as described above, the pause slider (30) pulls the pause slider (30) against the biasing force of the coil spring (31) while the tape is running at a constant speed in the forward or reverse direction. When the stop lever (27) is released from the pressing force, the stop lever (27) is rotated by the biasing force of the tension coil spring (29) so that the locking tooth (27a) at the tip end is a constant speed limiter gear. It meshes with (21). Therefore, the constant speed limiter gear (21) is locked,
The constant speed gear (19) is idling due to the slip of the slip member (20) with respect to the constant speed limiter gear (21).
Rotational force is not transmitted to the gear (16), and the reel hub drive shaft (1) or (2) is locked to the NR gear (16) which is meshed with the constant speed limiter gear (21) in the locked state. The tape running is stopped. That is, while the pause slider (30) is in the sliding state, the tape running is temporarily stopped and the tape is in the pause state.

Further, the FR pulley (17) is directly transmitted with the rotational force of the capstan (7), the high speed limiter gear (18) is rotated integrally therewith, and the FR gear (15) meshed with the gear (18). ) Is rotating at high speed.

In this state, when the FR gear (15) is switched to the right reel hub drive shaft (2) side and meshed with the upper gear (2a), the reel hub drive shaft (2) rotates at high speed, that is, fast forward (FF) operation of the tape. To be done.

When the FR gear (15) is switched to the left reel hub drive shaft (1) side and meshed with the intermediate gear (13), the FR gear (1)
The high-speed rotational force of 5) is transmitted to the intermediate gear (13), the left reel hub drive shaft (1) is reversely driven via the gear (1a) meshed with the intermediate gear (13), and the tape runs in the opposite direction at high speed.
That is, rewinding (REW) is performed.

According to this example configured as described above, the intermediate gear (1) for transmitting the rewinding rotation power and the reverse rotation power from the FR gear (15) and the NR gear (16) to one reel hub drive shaft (1).
3) is formed to be long in the axial direction, and the mechanical chassis (3) is pierced on the front and back to be axially supported by a bearing (14) provided by outsert molding on the mechanical chassis (3) so that it can be shared. The intermediate gear and its bearing member are reduced, and the configuration of the rotational force transmission mechanism is simplified.

In the embodiment described above, the rotational force transmitting mechanism is composed of gears, but instead of this, an idler may be used to transmit the rotational force by the frictional force of the contact surface. In this case, the reel hub drive A friction wheel such as a rubber tire is fitted on the shafts (1) and (2), and an idler is also used as the intermediate gear (13). As described above, the present invention can be applied to the rotational force transmission mechanism as long as the rotational force transmission mechanism is configured to transmit the rotational force.

Also, stopper lever (27) and pause slider (30)
Can be integrated depending on the positional relationship with the constant speed limiter gear (21) and the overstroke when the pause slider (30) is locked.

(Effects of the Invention) As described above, according to the present invention, the intermediate rotating body, which is long in the axial direction, is axially supported by the bearings provided in the mechanical chassis and penetrates the front and back of the mechanical chassis. Since the rotational force is transmitted from the forward / reverse high-speed rotating body and the forward / reverse constant-speed rotating body to the reel hub drive shaft in common, the positional accuracy of the intermediate rotating body with respect to the reel hub drive shaft is ensured, and The rotational force is reliably transmitted from the forward / reverse constant-speed rotating body to the reel hub drive shaft, which eliminates the possibility of noise and adverse effects on performance such as tape running speed fluctuations. It reduces the number of design problems and simplifies the structure of the torque transmission mechanism.
This has effects such as easy assembly and cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of a tape drive mechanism of an example of a tape recorder according to the present invention, FIG. 2 is a partially cutaway front view of a reel hub drive shaft portion, and FIG. 3 is a plan view of essential parts of a temporary stop mechanism.
FIG. 4 is a sectional view of the rotary clutch mechanism. In the figure, (1) and (2) are reel hub drive shafts, (12) is a rotational force transmission mechanism, (13) is an intermediate gear as an intermediate rotating body, and (1
4) is a bearing, (15) is a FR gear as a forward / reverse high-speed rotating body,
(16) is an NR gear as a forward / reverse constant speed rotating body, (17) is an FR pulley as a high speed driving rotating body, (19) is a constant speed gear as a constant speed driving rotating body, and (21) is a constant speed limiter. It is a gear.

Claims (1)

[Scope of utility model registration request] 1. A forward / reverse high-speed rotating body to which a rotating force is transmitted from a high-speed driving rotating body is arranged on one surface side of a mechanical chassis, and a rotating force is transmitted from a constant-speed driving rotating body to the other surface. A forward / reverse constant-speed rotating body is arranged, and a rotary drive is transmitted from the high-speed rotating body and the constant-speed rotating body to the reel hub drive shaft via the intermediate rotating body, respectively. It is formed to be long in the axial direction so as to correspond to the high-speed rotating body and the constant-speed rotating body in common, and is rotatably supported in the mechanical chassis so as to pass through both the front and back sides and to be constantly rotated in conjunction with the reel hub drive shaft. A drive transmission mechanism in a tape recorder, wherein the rotational force of the high-speed rotating body and the constant-speed rotating body are selectively transmitted to the reel hub drive shaft via the intermediate rotating body.