JPH0719408B2 - Tape recorder mode switching device - Google Patents

Description

The present invention relates to a mode switching device for a tape recorder in which a pinch roller is brought into contact with and separated from a capstan shaft to drive a tape.

(Prior Art) FIG. 7 shows a conventional tape recorder mode switching device. The drive arm 22 is pivotally attached to the flywheel gear 21 coaxial with the capstan flywheel 40, and the drive gear 2 is provided at both ends thereof.
3, 24 are attached and mesh with the flywheel gear 21, the drive gear 23 is meshed with the take-up reel gear 27 by the normal rotation of the motor 26 during recording / playback, and the drive gear 23 is meshed with the reverse rotation of the motor 26 during rewinding. Is engaged with the fixed gear 28 to rotate in the direction of arrow A, and at the same time, the drive arm claw 30 protruding from the drive arm 22 is provided.
Then, the cam pin 32 of the cam gear 31 is pressed to slightly rotate the cam gear 31, the cam gear 31 and the flywheel gear 21 are meshed, and the cam gear 31 rotates in the direction of arrow B. Then, the cam 39 has the pin 35 protruding from the head substrate 34 to which the pinch roller 33 is attached.
Is pressed outward to be locked to the locking step 36a of the guide hole 36, and the pinch roller 33 is held in a state separated from the capstan shaft 37. Therefore, the drive gear 24 meshes with the supply gear 38, and the tape is wound at a predetermined high speed while rewinding.

(Problems to be Solved by the Invention) In the above-mentioned prior art, however, two drive gears, a cam gear, and a mechanism for meshing / separating the cam gear and the flywheel gear are required, which makes the structure complicated and expensive. There was a problem.

(Means for Solving the Problems) The present invention is intended to solve the above problems, and a capstan shaft and a flywheel gear are coaxially fixed to a flywheel, and a drive arm is attached to the flywheel gear. A drive gear that meshes with the flywheel gear is attached to the tip of the drive arm, a fixed gear that meshes with the drive gear is attached to the main body base, and the drive gear rotates with the fixed gear that meshes with the rotation direction of the flywheel gear. Then, the drive gear is formed so as to mesh with the take-up reel gear or the supply reel gear, the drive arm is provided with a cam, the pinch roller shaft protruding from the head substrate is provided in the guide hole of the main body base, and the head substrate is always spring-loaded. Pull it to bring the pinch roller into pressure contact with the capstan shaft, provide an engaging step in the guide hole, and drive it by reversing the flywheel. The gear and fixed gear mesh with each other to rotate the drive arm.While the drive arm is rotating, the cam pushes back the pinch roller shaft and locks it at the engaging stage, or removes it from the locking stage to cap the pinch roller. A tape recorder mode switching device that presses against a stun shaft. The capstan shaft and the flywheel gear are coaxially fixed to the flywheel, the drive arm is attached to the flywheel gear, and the drive gear that meshes with the flywheel gear is attached to the tip of the drive arm.
A fixed gear that rotates in mesh with the drive gear is attached to the main body base, and the drive gear and the fixed gear mesh with each other depending on the rotation direction of the flywheel gear to rotate the drive arm, so that the drive gear meshes with the take-up reel gear or the supply reel gear. None,
The drive arm is provided with a cam, the pinch roller shaft protruding from the head substrate is arranged in the guide hole of the main body base, and the head substrate is constantly pulled by a spring to press the pinch roller against the capstan shaft, An engagement step is provided, and the drive gear and the fixed gear are meshed by reversing the flywheel to rotate the drive arm, and the cam pushes back the pinch roller shaft while the drive arm is rotating and is locked to the engagement step. Alternatively, a lock pawl for the pinch roller shaft is provided in the guide hole in the mode switching device of the tape recorder in which the pinch roller is pressed against the capstan shaft after being removed from the locking step.
It is characterized by a mode switching device for a tape recorder in which the cam is prevented from coming into contact with the pinch roller shaft when the drive arm is rotated by returning the head substrate by an appropriate means until it is locked by the lock claw.

(Example) 1 is a main body base to which a motor 2 is attached, and an output shaft 3 of the motor 2 and a flywheel 4 are linked by a belt 5. The base of the drive arm 7 is fixed to the flywheel gear 6 that is fixed coaxially with the flywheel 4, and the drive gear 8 is meshed with the flywheel wheel 6 and the half-moon-shaped fixed gear 9 fixed to the main body base 1 at the tip. It is installed. Reference numeral 10 is a take-up reel gear, and 11 is a rewind reel gear. A pinch roller shaft 14a is disposed in a guide hole 12 formed in the main body base 1, and a spring 15 pulling the substrate 13 pulls the guide hole toward the capstan shaft 16.
During recording / playback, the pinch roller 14 shaft 14a is
The pinch roller 14 is pressed against the capstan shaft 16. A cam 18 is provided on the drive arm 7 so that the drive arm 7 engages with the pinch roller shaft 14a when the drive arm 7 rotates. A pinch roller shaft 14 is provided in the middle of the guide hole 12.
An engagement step 19 for agf engagement is provided, and a lock claw 20 of the pinch roller shaft 14a is provided further inside thereof.

Next, the operation will be described.

Figures 1 and 4 show the recording and playback. The motor 2 rotates clockwise (forward direction), the flywheel gear 6 and the drive arm 7 rotate clockwise, and the drive gear 8 meshes with the take-up reel gear 10. At this time, the shaft 14 of the pinch roller 14
a is a recess 17 at the tip of the guide hole 12 due to the elasticity of the spring 15.
, The pinch roller 14 is pressed against the capstan shaft 16 to wind the tape at a standard speed, and recording or reproducing is performed by switching the switch. The drive gear 8 is slightly disengaged from the fixed gear 9.

Figures 2 and 5 are for REW. When the motor 2 in FIG. 1 rotates counterclockwise (reverse direction), the drive arm 7 rotates counterclockwise (reverse direction), and the drive gear 8 meshes with the fixed gear 9 and rotates counterclockwise. Then, as shown in FIGS. 2 and 5, the fixed gear 9 is disengaged and meshes with the rewind reel gear 11. At this time, the cam 18 of the drive arm 7 pushes the pinch roller shaft 14a fitted in the recess 17 outward and engages with the engagement step 19.

Therefore, the pinch roller 14 is held in a state of being separated from the capstan shaft 16. Therefore, the tape is wound on the rewind reel at a high speed.

Next, when the motor 2 is rotated in the clockwise direction (forward direction), the drive arm 7 is rotated in the clockwise direction (forward direction), as shown in FIGS. 1 and 4. During this rotation, the cam 18 of the drive arm 7 pushes the pinch roller shaft 14a engaged with the engagement step 19 out of the engagement step 19, so that the pinch roller shaft 14a is returned to the recess 17 by the spring 15 and pinched. The roller 14 is pressed against the capstan shaft 16 to be in a recording / playback state.

Next, the substrate 13 is pulled against the elastic force of the spring 15 manually or by other means, and the pinch roller shaft 14a is locked to the lock claw 20 as shown in FIGS. Since the cam 18 of the drive arm 7 does not come into contact with the pinch roller shaft 14a even when the drive gear 8 rotates in the forward and reverse directions, the motor 2 rotates clockwise and the drive gear 8 meshes with the take-up reel gear 10. Since 14 is separated from the capstan shaft 16, fast winding (FF) can be performed.

(Effect) According to the present invention, the capstan shaft and the flywheel gear are coaxially fixed to the flywheel, the drive arm is attached to the flywheel gear, and the drive gear that meshes with the flywheel gear is attached to the tip of the drive arm. , Mounting a fixed gear on which the drive gear meshes and rotates,
Depending on the direction of rotation of the flywheel gear, the drive gear and the fixed gear mesh and the drive arm rotates, so that the drive gear does not mesh with the take-up reel gear or the supply reel gear. A pinch roller shaft protruding from the head substrate is provided, the head substrate is constantly pulled by a spring to press the pinch roller against the capstan shaft, an engaging step is provided in the guide hole, and a drive gear is created by reversing the flywheel. And a fixed gear mesh with each other to rotate the drive arm, and while the drive arm is rotating, the cam pushes back the pinch roller shaft and locks the pinch roller shaft at the engaging step or disengages from the locking step to move the pinch roller to the capstan. A tape recorder mode switching device that presses against the shaft. A capstan shaft and a flywheel gear are coaxially fixed to a flywheel, a drive arm is attached to the flywheel gear, a drive gear that meshes with the flywheel gear is attached to the tip of the drive arm, and the drive gear meshes and rotates. The gear is attached to the main body base, the drive gear and the fixed gear mesh with each other depending on the rotation direction of the flywheel gear, the drive arm rotates, and the drive gear does not mesh with the take-up reel gear or the supply reel gear. The pinch roller shaft protruding from the head substrate is disposed in the guide hole of the main body base, the head substrate is constantly pulled by a spring to press the pinch roller against the capstan shaft, and an engaging step is provided in the guide hole. When the flywheel is reversed, the drive gear and the fixed gear mesh with each other to rotate the drive arm, and the cam is rotated while the drive arm is rotating. In a tape recorder mode switching device in which the pinch roller shaft is pushed back and locked to the engaging step, or the pinch roller is pressed against the capstan shaft after being removed from the locking step, the pinch roller axis is inserted into the guide hole. Since the lock switch of the tape recorder is provided, and the head substrate is returned to the lock claw by an appropriate means, the cam is not brought into contact with the pinch roller shaft when the drive arm is rotated. It is possible to provide at low cost a tape recorder that does not require a complicated mechanism as in the past, can significantly reduce the number of parts, and can perform various mode switching with an extremely simple mechanism.

[Brief description of drawings]

FIG. 1 is a plan view of recording and reproducing according to an embodiment of the present invention, FIG. 2 is a plan view of the same rewinding, FIG. 3 is a plan view of the same early winding, and FIG. 4 is a main part of FIG. An enlarged plan view, FIG. 5 is an enlarged plan view of an essential part of FIG. 2, FIG. 6 is an enlarged plan view of an essential part of FIG. 3, and FIG. 7 is a plan view of the conventional device during recording and reproduction. 1 …… Main body base 2 …… Motor 4 …… Flywheel 6 …… Flywheel gear 7 …… Drive arm 8 …… Drive gear 9 …… Fixed gear 10 …… Rewind reel gear 11 …… Rewind reel gear 12 …… Guide hole 13 …… Substrate 14 …… Pinch roller 14a …… Pinch roller shaft 15 …… Spring 16 …… Capstan shaft 18 …… Cam 19 …… Engagement step 20 …… Lock claw

Claims (2)

[Claims] A capstan shaft and a flywheel gear are coaxially fixed to a flywheel, a drive arm is attached to the flywheel gear, and a drive gear meshing with the flywheel gear is attached to the tip of the drive arm. A fixed gear that rotates in mesh is attached to the main body base, the drive gear and the fixed gear mesh with each other depending on the rotation direction of the flywheel gear, the drive arm rotates, and the drive gear does not mesh with the take-up reel gear or the supply reel gear. The arm is provided with a cam, the pinch roller shaft protruding from the head substrate is arranged in the guide hole of the main body base, and the head substrate is constantly pulled by the spring to press the pinch roller against the capstan shaft to engage the guide hole. A gear is provided, and the drive gear and fixed gear mesh with each other by reversing the flywheel, rotating the drive arm, and rotating the drive arm. Said cam or engaged with the engagement stage push back the pinch roller shaft, the tape recorder of the mode switching apparatus as or pressed against the pinch roller to the capstan shaft disconnect from the locking stepped on. 2. A capstan shaft and a flywheel gear are coaxially fixed to a flywheel, a drive arm is attached to the flywheel gear, and a drive gear meshing with the flywheel gear is attached to the tip of the drive arm. A fixed gear that rotates in mesh is attached to the main body base, the drive gear and the fixed gear mesh with each other depending on the rotation direction of the flywheel gear, the drive arm rotates, and the drive gear does not mesh with the take-up reel gear or the supply reel gear. The arm is provided with a cam, the pinch roller shaft protruding from the head substrate is arranged in the guide hole of the main body base, and the head substrate is constantly pulled by the spring to press the pinch roller against the capstan shaft to engage the guide hole. A gear is provided, and the drive gear and fixed gear mesh with each other by reversing the flywheel, rotating the drive arm, and rotating the drive arm. In the mode switching device of the tape recorder, the cam pushes back the pinch roller shaft and locks the pinch roller shaft to the engaging step, or disengages from the locking step to press the pinch roller against the capstan shaft. A mode switching device for a tape recorder, in which a lock claw of a pinch roller shaft is provided on the head, and the head substrate is returned to the lock claw by an appropriate means to prevent the cam from coming into contact with the pinch roller shaft when the drive arm rotates.