JPH06309738A - Mode changeover device - Google Patents

Abstract

PURPOSE:To obtain, at a low cost, the tape recorder changing over the positional control of a slide plate to each operation mode with a cam formed on a driving arm by the rotating direction of a rotary gear and the rotation of the driving arm. CONSTITUTION:The driving arm 7 is mounted coaxially with the rotary gear, and a driving gear 8 always engaged with the rotary gear is arranged on a tip of the driving arm, then a fixed gear 9 with which the driving gear is engaged and rotated, is formed on a main body base 1. By the rotation and direction of the rotary gear, the driving gear is rotated while engaging with the rotating gear and fixed gear, thereby the driving arm is rotated and the driving gear is rotated while engaging with a take-up gear to wind a magnetic tape. The changeover to each operation mode is performed with the cam formed on the driving arm in such a manner that the slide plate is pushed back to lock to a locking stage formed on the main body base by engaging with a projectingly provided part 17a arranged on the slide plate during the rotation of the driving arm, or a magnetic head 15 mounted on the slide plate is controlled to the stop position, the sound recording/reproducing position and the intermediate position of them by unlocking the projectingly provided part from the locking stages 13a-c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mode switching device, such as a tape recorder, which is adapted to switch between various operating modes by the rotation of a motor and the cam of a drive arm.

[0002]

2. Description of the Related Art There are three types of basic operations of a tape recorder, namely, recording / playback, fast-forwarding, and rewinding, and the tape can be switched by using the rotation and direction of a motor. There is a recorder.
FIG. 11 is a plan view of a tape recorder mode switching device using a conventional motor during recording and reproduction. A motor in which a drive arm 22 is pivotally mounted coaxially with a capstan shaft 37 and a flywheel 40 having a flywheel gear 21 formed, and drive gears 23 and 24 are attached to both ends of the drive arm 22 so that the flywheel gear 21 is always meshed with the drive arm 22. 26 rotates in the clockwise direction (forward direction), the flywheel gear 21 also rotates in the clockwise direction, the drive arm 22 rotates in the clockwise direction, and the drive gear 23 meshes with the gear of the take-up reel 27 to wind the take-up reel 27. When the drive arm 22 rotates as the reel 27 rotates, the drive gear 23 meshes with the fixed gear 28 of the main body base, and the cam pin 32 of the cam gear 31 is pressed by the drive arm pawl 30 protruding from the drive arm 22. The cam gear 31 is slightly rotated to mesh the cam gear 31 with the flywheel gear 21, and the cam gear 31 is rotated counterclockwise to project the pin 35 of the head substrate 34. By pressing and displacing forward, the magnetic head 25 and the pinch roller 33 formed on the head substrate are locked at the recording / playback position, and the magnetic tape is pressed against the capstan shaft 37 by the pinch roller and pulled at the standard speed for winding. ,recording·
Playback state.

During rewinding, the motor 26 is rotated counterclockwise, the flywheel gear 21 is rotated counterclockwise, the drive arm 22 is rotated counterclockwise, and the drive gear 23 is meshed with the fixed gear 28. Then, at the same time, the cam gear 3 is rotated by the drive arm pawl 30 protruding from the drive arm 22.
The cam gear 31 is slightly rotated by pressing the cam pin 32 of No. 1, the cam gear 31 and the flywheel gear 21 are meshed, the cam gear 31 is rotated clockwise, and the cam 39 of the head substrate 34 to which the pinch roller 33 is attached. The protruding lower pin 35 is pressed and displaced rearward, the head substrate is locked to the locking step 36a of the guide hole 36, the pinch roller 33 is held in a state of being separated from the capstan shaft 37, and the drive gear 24 is wound. The reel 38 meshes with the gear and rotates to a rewinding state.

[0004]

In the above-mentioned prior art, however, the drive arm and the cam gear are formed as separate parts, and the drive gear, the cam gear and the mechanism for meshing / separating the cam gear and the flywheel gear are required. However, the structure is complicated and expensive.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a cam is formed on a drive arm coaxially attached to a rotary gear, and the tip of the drive arm is always meshed with a flywheel gear. The drive gear is attached and consists of a fixed gear on the main body that rotates in mesh with the drive gear.The drive gear and the fixed gear mesh with each other depending on the rotation direction of the rotary gear, the drive arm rotates, and the drive gear meshes with the take-up gear. do it,
The head is always in a stop position by a spring because the cam of the drive arm engages with the protruding portion of the locking arm provided on the head substrate depending on the direction of rotation of the drive arm so that the take-up reel does not rotate. Push back the board and lock it in the locking step of the guide hole formed in the base of the main body, flip it over, and remove it from the locking step with the nuclear cam, and remove the magnetic head of the head board from the recording / playback position and stop position and those A mode switching device that regulates to the intermediate position of each and switches to each operation mode.

[0006]

[Embodiment] 1 is a main body with a motor 2 attached,
A drive arm 4 is attached to the motor 2 coaxially with the rotary gear 3, a drive gear 5 that is constantly meshed with the rotary gear 3 is attached to the tip of the drive arm, and a half-moon-shaped fixed to the main body base 1 in which the nuclear drive gear 5 rotates in mesh. A gear 6 is formed, and 7 is a guide hole formed in the main body base 1 and has locking steps 8a and 8b. The slide plate 9 is composed of a locking arm 10 having a projecting portion 10a, and is regulated to a stop position of the main body base by springs 11a and 11b arranged on a spring support 1b and a spring locking 1c and a board guide 1a. ing. Cams 12a and 12b are formed on the drive arm 4 so that the projecting portion 10a of the locking arm 10 engages when the drive arm 4 rotates, and is guided and engaged by the guide hole 7 of the main body base 1. ing.

Next, the operation will be described. In FIG. 1, the slide plate 9 is at the neutral point, and the motor 2 is in a stopped state. In FIG. 2, the motor 2 rotates in the clockwise direction (forward direction), the drive gear 5 rotates in the clockwise direction together with the rotary gear, the drive arm 7 rotates in the clockwise direction, and the drive gear 8 rotates the gear of the take-up reel 10. Meshes with. Head substrate 14 when the drive arm 7 is rotated
Engages A1, A2, A3 of the cam 18a of the drive arm 7 and the projecting portion 17a of the locking arm 17 of the head substrate 14, and locks at the locking step 13a of the guide hole 12 to move the head substrate 14 Is at the recording / playback position, and the pinch roller 16 presses the magnetic tape against the capstan shaft 19 and pulls the tape at a standard speed to wind it up to be in the recording / playback state.
The drive gear 8 is slightly disengaged from the fixed gear 9.

In FIG. 2, the motor 2 of FIG. 1 is rotated counterclockwise (reverse direction), the drive arm 7 is rotated counterclockwise (reverse direction), and the drive gear 8 meshes with the fixed gear 9. Counterclockwise (reverse) while rotating clockwise (forward)
Turn to. The protrusion 17a of the locking arm 17 locked by the locking step 13a of the guide hole 12 is pushed back by the A3 and A4 of the cam 18a of the drive arm 7 from the return locking step 13a, and the head substrate 14 is replaced by a spring. At 20b the stop position is reached,
Stops the motor and puts it in a stopped state.

FIG. 4 shows REV winding / early winding erasing. The motor 2 in FIG. 1 rotates counterclockwise (reverse direction),
The drive arm 7 rotates counterclockwise (reverse direction), the drive gear 8 meshes with the fixed gear 9 and rotates clockwise (forward direction) while rotating counterclockwise (reverse direction), and guides. Hole 12
The protruding portion 17a of the locking arm 17 locked by the locking step 13a is pushed back by the A3 and A4 of the cam 18a of the drive arm 7 and released from the locking step 13a, and the head substrate 14 in FIG. , The drive arm 7 further rotates and the abutting portion 17a
From A4 and A1 of cam 18a to B1 and B of cam 18b
2, B3 to engage the head substrate 14 with springs 20b, 20
It is moved backward and forward at a and is locked by the locking step 13b to the REV position. The drive gear 8 is slightly disengaged from the fixed gear 9, meshes with the gear of the take-up reel 11 and is rotated to be in the REV state. Since the pinch roller 16 is slightly apart from the capstan shaft 19 and the magnetic head 15 is in contact with the magnetic tape, the fast winding can be erased.

In FIG. 5, the flywheel gear 6 of FIG. 4 is rotated clockwise (forward direction), the drive arm 7 is rotated clockwise (forward direction), and the drive gear 8 meshes with the fixed gear 9. Rotate counterclockwise (reverse direction) and rotate clockwise (forward direction). The protruding portion 17a of the locking arm 17 locked by the locking step 13b of the guide hole 12 is pushed back by the cams 18b of the drive arm 7 at B3 and B4 to be released from the locking step 13b, and the head substrate 14 is replaced by the spring 20b. To the stop position,
Further, the drive arm 7 is further rotated, and the protruding portion 1 of the locking arm 17 is moved.
7a is in a stopped state on the surfaces B4 and B1 of the cam 18b of the drive arm 7.

FIG. 6 shows the time of early winding. Motor 2 of FIG.
Is rotated counterclockwise (reverse direction), the drive arm 7 is rotated counterclockwise (reverse direction), and the drive gear 8 is fixed gear 9
While engaging in the direction of rotation and rotating in the counterclockwise direction (reverse direction) while rotating in the clockwise direction (forward direction), the protruding portion 17a of the locking arm 17 locked by the locking step 13a of the guide hole 12 is , Push-back locking step 13 by A3 and A4 of the cam 18a of the drive arm 7
Then, the head substrate 14 is moved to the stop position by the spring 20b. When the protruding portion 17a of the locking arm 17 is on the surface A4, A1 of the cam 18a of the drive arm 7, the motor 2
Is inverted and rotated clockwise (forward direction), and the drive arm 7 rotates clockwise (forward direction). The drive gear 8 is
The take-up reel 10 meshes with the gear of the take-up reel 10 to rotate the take-up reel 10 in the clockwise direction (forward direction) to be in a fast take-up state.

FIG. 7 shows the case of fast rewinding. The flywheel gear 6 of FIG. 4 is rotated clockwise (forward direction), the drive arm 7 is rotated clockwise (forward direction), and the drive gear 8 meshes with the fixed gear 9 to rotate counterclockwise (reverse direction). ), While rotating in the clockwise direction (forward direction). The protruding portion 17a of the locking arm 17 locked by the locking step 13b of the guide hole 12.
Is pushed back by B3 and B4 of the cam 18b of the drive arm 7 and released from the locking step 13b.
Stops at. The protruding portion 17a of the locking arm 17 is
The motor 2 is inverted and rotated in the counterclockwise direction (reverse direction) while being on the B4 and B1 surfaces of the cam 18b of the drive arm 7, and the drive arm 7 rotates in the counterclockwise direction (reverse direction) to drive. The gear 8 meshes with the gear of the take-up reel 11 to rotate the take-up reel 11 in the counterclockwise direction (reverse direction), and the fast rewinding state is obtained.

[0013]

According to the present invention, the drive arm rotates in the rotation direction of the flywheel, and the head substrate is formed by the engagement step of the cam formed in the drive arm and the guide hole formed in the main body base according to the rotation direction. Since the magnetic head can be regulated to the recording / playback position, the stop position, and the intermediate position between them, and can be converted to each operation mode, it is possible to reduce the number of parts without the need for a complicated mechanism as in the past. , A tape recorder can be provided at low cost.

[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 when stopped.

FIG. 3 is a plan view of an essential part of FIG.

FIG. 4 is a plan view of an essential part during REV.

FIG. 5 is a plan view of an essential part when stopped.

FIG. 6 is a plan view of an essential part during fast winding.

FIG. 7 is a plan view of an essential part during fast rewinding.

FIG. 8 is a plan view of essential parts during reverse recording / reproduction.

FIG. 9 is a detailed related diagram of a guide hole, a cam portion, and a protruding portion.

FIG. 10 is an enlarged detailed plan view of the cam portion in FIG.

FIG. 11 is a plan view of a conventional device during recording / playback.

[Explanation of symbols]

 1 Main Body Base 1a Board Guide 1b Spring Strut 1c Spring Locking 2 Motor 3 Motor Pulley 4 Flywheel 5 Belt 6 Flywheel Gear 7 Drive Arm 8 Drive Gear 9 Fixed Gear 10, 11 Winding Reel 12 Guide Holes 13a, 13b, 13c Stop stage 14 Head substrate 15 Magnetic head 16 Pinch roller 17 Locking arm 17a Projection part 18a, 18b, 18c Cam 19 Capstan shaft 20a, 20b Spring

Claims (1)

[Claims] 1. A drive arm is mounted coaxially with a rotary gear, a drive gear which is constantly meshed with the rotary gear is provided at the tip of the nuclear drive arm, and a fixed gear for meshing rotation of the nuclear drive gear is formed on the main body base to rotate the rotary gear. Depending on the rotation and direction of the gear, the drive gear meshes with the rotary gear and the fixed gear to rotate the drive arm, and the drive gear moves away from the fixed gear and meshes with the take-up gear to rotate. The moving drive arm is engaged with the protruding part provided on the slide plate to move the slide plate, and the protruding part is locked to the locking step formed on the main body base, or is rotated counterclockwise. A mode switching device for performing each operation mode by removing a protruding portion from a locking step or by forming a cam for locking by locking to another locking step.