JPH0355148Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a tape running direction switching device for a tape recorder that allows playback when the tape is running in either the left or right direction.

(b) Prior Art Some conventional tape recorders are designed to be able to perform playback when the tape is run in either the left or right direction. In such a tape recorder, for example, as described in Japanese Utility Model Publication No. 57-40444, the pinch roller switching board is also moved by sliding the head plate, thereby rotating the support member and switching one of the pinch rollers. The drive pulley is brought into contact with the capstan, the other pinch roller is separated from the capstan, and the rocking plate is rocked to bring the drive pulley into selective contact with the left and right reel stands. In this case, the drive pulley has a side that moves in and a side that moves away depending on the direction of rotation, and the drive pulley on the side that tends to move away must be strongly held down by a spring, but must be held down. It is not sufficient to simply bias the lever to which the drive pulley is attached with a spring, since the direction of the force changes depending on the direction of tape travel.

(c) Purpose of the invention This invention provides a pin in the pinch roller mounting bracket that attaches the pinch roller on the side that is not used, and uses the pin to apply force to the gear that transmits the driving force, and The present invention relates to a tape running direction switching device for a tape recorder which allows the running direction to be switched well.

(d) Structure of the invention The present invention forms cams with inclined sides connected to the left and right recesses of the tape running switching lever that switches the running direction of the tape, and provides pins for the left and right pinch roller mounting brackets to change the tape running direction. When switching, slide the running direction switching lever, position the pin of one pinch roller mounting bracket in the recessed part of the cam of the running direction switching lever, bring the pinch roller into contact with the capstan by the biasing force of the spring, and then The pin of the pinch roller mounting bracket is brought into contact with the inclined surface of the cam to apply the biasing force of the spring to the tape travel switching lever, which energizes the idler arm rotated by the tape travel switching lever to generate a driving force. The present invention relates to a tape running direction switching device for a tape recorder, which is characterized in that various gears that transmit information to a reel gear are energized in a meshing direction depending on the running direction.

(E) Embodiment The running direction switching device for a tape recorder according to the present invention will be described with reference to the drawings. Reference numeral 1 denotes a tape running switching lever, a cam 6 having inclined sides 4 and 5 connected to left and right recesses 2 and 3; 7 is formed and is slid by operating a control lever (not shown) or by a crank lever (not shown) which is reversed when the tape is wound to the end. 8 and 9 are axis 1
Pinch roller 12, which is rotatable at 0 and 11,
13 and pins 14, 15, 16, 17 are attached, and a wire spring 18 is in contact with the pins 15, 17 to urge the pinch roller mounting fittings 8, 9 forward. 1
9 and 20 are capstans, 21 is a switching lever supported by a shaft 22, and has forked locking pieces 2 at both ends.
3 and 24, one of the locking pieces 24 locks the cut-and-raised piece 25 of the tape running switching lever 1,
A pin 28 of an idler arm 27 rotatably attached to a shaft 26 is engaged with the other locking piece 23. 29 and 30 are reel gears in which the reel shafts 31 and 32 are coaxially provided, 33 is a drive gear rotated by a motor, and 34, 35, and 36 are for transmitting the driving force of the drive gear 33 to the reel gears 29 and 30. In the relay gears, the relay gear 36 meshes with the right reel gear 30, and the relay gear 35 meshes with the left reel gear 29, and the relay gear 34 meshes with the relay gear 35.
4 and 36 are selectively engaged with a switching gear 37 attached to the idler arm 27.

Next, the operation of the tape running direction switching device for the tape recorder of the present invention will be explained.

Suppose now that the tape is played by running from the left side to the right side. In this case, as shown in FIG. 1, the tape running switching lever 1 is slid in the direction of arrow A, and as shown in FIG. wire spring 1 corresponding to pin 17
The pinch roller mounting bracket 9 is rotated clockwise by applying force of 8 to bring the pinch roller 13 into contact with the capstan 20, but as shown in FIG.
4 corresponds to the inclined side 4 of the cam 6, and prevents the pinch roller mounting bracket 8 from rotating in the counterclockwise direction.
The pinch roller 12 is separated from the capstan 19. Also, at this time, since the switching lever 21 is rotated counterclockwise, the idler arm 27, which is engaged with the switching lever 21 through the pin 28, is rotated clockwise, relaying the switching gear 37 to the drive gear 33. It meshes with gear 36. Therefore, the tape is run from the left side to the right side by the pinch roller 13 and the capstan 20. Furthermore, the driving force of the drive gear 33 is transmitted to the right reel gear 30 via the switching gear 37 and the relay gear 36 to rotate the reel shaft 32, so that the hub fitted to the reel shaft 32 is also rotated and the pinch Since the running tape is wound up by the roller 13 and the capstan 20, the signal recorded on the tape is reproduced by a magnetic head.

In this case, there is no problem because the switching gear 37 and the relay gear 36 become wedged as they rotate, but the driving gear 33 and the switching gear 37 tend to separate, so it is necessary to apply pressure with a spring. be. The present invention applies this urging force to the pin 14 of the pinch roller mounting bracket 8 on the side that is not currently contributing to the drive.
are obtained by using. That is, a wire spring 18 is brought into contact with the pin 15 of the pinch roller mounting bracket 8, and the biasing force of the wire spring 18 exerts a rotational force on the pinch roller mounting bracket 8 in a counterclockwise direction. This rotational force is converted by the pin 14 coming into contact with the inclined side 4 of the tape running switching lever 1, and urges the tape running switching lever 1 in the direction of arrow A. Therefore, the switching lever 21 is energized counterclockwise, and the idler arm 27 is further energized clockwise, so that the switching gear 37 is moved to the drive gear 33.
direction, the switching gear 37 connects to the drive gear 33.
This prevents it from separating from the mesh. When the tape is run from the left side to the right side and played until it reaches the end, the tape end detection mechanism is activated and the crank lever is reversed.
direction. Then, the pin 14 of the pinch roller mounting bracket 8 is positioned in the recess 2 of the cam 6 of the tape running switching lever 1, so the pinch roller mounting bracket 8 is rotated counterclockwise by the wire spring 18 and pinched. Since the roller 12 is brought into contact with the capstan 19 and the pin 16 of the pinch roller mounting bracket 9 is brought into contact with the inclined side 5 of the cam 7, the pinch roller 13 is separated from the capstan 20. Further, the switching lever 21 is rotated clockwise and the idler arm 27 is rotated counterclockwise, so that the switching gear 37 is meshed with the drive gear 33 and the relay gear 34. Furthermore, Capstan 19
is rotated in the opposite direction to the capstan 20, so the capstan 19 and the pinch roller 12
At the same time, the tape is run from the right side to the left side, and a track different from the above one is played back. Further, the rotational force of the drive gear 33 is transferred to the switching gear 37 and the relay gear 3.
4, 35 and reel gear 29,
The reel gear 2 is rotated in the opposite direction to the reel gear 30, and the pinch roller 12 and the capstan 1
The tape driven by 9 is wound around a hub fitted to the reel shaft 31. At this time, the switching gear 37
tends to become disengaged from the relay gear 34. However, since the pin 16 of the pinch roller mounting bracket 9 hits the inclined side 5 of the cam 7 of the tape running switching lever 1, the biasing force of the wire spring 18 is applied to the tape running switching lever via the pins 16 and 17 of the pinch roller mounting bracket 9. 1, the switching lever 21 is rotated clockwise, the idler arm 27 is rotated counterclockwise, and the switching gear 37 is pressed against the drive gear 33.

(f) Effects of the invention As described above, the tape running direction switching device for a tape recorder of the present invention forms a cam having inclined sides on the left and right sides of the tape running switching lever, and a pinch roller on the side that does not contribute to tape running. Since the pin of the mounting bracket is brought into contact with the inclined side of the cam, the direction of the biasing force of the wire spring that biases the pinch roller mounting bracket is changed in order to bring the pinch roller into contact with the capstan, and the idler arm is attached to the idler arm. The attached switching gear can be energized in the direction of meshing with various gears. Therefore, the switching gear can always be biased in the direction of meshing with various gears such as the relay gear, depending on the tape running direction, without using any additional parts.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tape running direction switching device for a tape recorder according to the present invention, and FIGS. 2 and 3 are enlarged plan views of essential parts of the tape running direction switching device for a tape recorder according to the present invention. 1... Tape running switching lever, 2, 3... Recessed portion, 4, 5... Inclined side, 6, 7... Cam, 8, 9
... Pinch roller mounting bracket, 12, 13 ... Pinch roller, 14, 15, 16, 17 ... Pin, 1
8...Wire spring, 19,20...Capstan, 21...Switching lever, 27...Idler arm, 29,30...Reel gear, 31,32
... Reel shaft, 33 ... Drive gear, 34, 35,
36...Relay gear, 37...Switching gear.

Claims (1)

[Scope of utility model registration request] A tape running switching lever is formed with cams having sloped sides connected to the recessed portions on the left and right sides, and is slid when switching the tape running direction; a pinch roller mounting bracket, a wire spring that rotationally biases the pair of left and right pinch roller mounting brackets, and a switching gear that is rotatably displaced according to the sliding position of the tape running switching lever and that is attached to the tip. It consists of an idler arm that selectively meshes with one of the relay gears provided in relation to the drive gear rotated by the motor and the left or right reel gear,
When the tape is running in one direction, the pin of the pinch roller mounting bracket on one side is positioned in the recessed part of the cam of the tape running switching lever, the pinch roller is brought into contact with the capstan, and the pin of the other pinch roller mounting bracket is moved to move the tape. The wire spring is brought into contact with the inclined side of the cam of the switching lever, and the direction of the biasing force of the wire spring is changed and applied to the tape running switching lever, thereby biasing the idler arm in the direction in which the various gears mesh. A tape running direction switching device for a tape recorder.