JPS5924462A - Reel drive disk driving mechanism of tape recorder - Google Patents

Abstract

PURPOSE:To drive a take-up reel drive disk at a high rotating speed by providing the 2nd and the 4th transmission gears behind the take-up reel drive disk and realizing thin, lightweight constitution, and driving the take-up reel drive disk through an independent transmission route from the 1st transmission gear to the 4th transmission gear in a quick traversing mode. CONSTITUTION:The 2nd and the 4th transmission gears, i.e. an FF (fast-forward take-up) gear 44 and the FF rewind gear 50 are provided in the same plane behind the reel drive disk 28 and 31 to reduce the size. In the quick traversing mode, a bent lever 41 coupling with the U-shaped dowel part 40 of the FF bar 37 turns clockwise and also draws a lever 48 toward the take-up reel drive disk 28 through a coiled spring 54. Consequently, the gear 50 meshes a take-up gear 34. The projecting piece 76 of the FF bar 37 presses one end of a lever 45 to turn the FF gear 43 to mesh the gear 50. Consequently, the rotation driving force of a motor 58 is transmitted to the take-up reel drive disk 28 through not a friction gear 30, but the gears 34 and 50 and the FF gear 43, driving the take-up reel drive disk 28 at the high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand drive mechanism of a tape recorder, and is particularly designed to reduce the thickness of the device and to drive the reel stand reliably and rationally in accordance with the mode. The object of the present invention is to provide a tape recorder glue/roll stand driving mechanism.

In order to make the tape recorder smaller and thinner, the conventional reel stand drive mechanism of a tape recorder has a structure in which the take-up reel stand is driven even in the fast forward mode via the same transmission mechanism as in the playback mode. That is, by changing the rotational speed of the drive motor, the fast forward mode and playback mode can be used.

Generally, a slip mechanism is provided between the drive mechanism and the take-up reel stand so that the magnetic group sent out by the capstan and the pinch roller in conjunction with the take-up reel stand can be smoothly wound up. Therefore, in the conventional drive mechanism where the fast-forward mode and playback mode are the same, in the fast-forward mode,
Since the take-up reel stand is driven via this slip mechanism, the drive torque and rotational speed are set low. In particular, when the magnetic tape is attached to the magnetic head as in the cue mode in which fast forwarding is performed during the playback mode, the tape running resistance is large and the winding speed becomes slow. In addition, if the tape shifts up and down, causing increased friction with the upper and lower sheets on the inside of the cassette housing that guide the tape winding, or if the tape is wound too tightly or tightly wound than necessary, There were drawbacks such as the inability to fast forward or rewind.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

In FIG. 1, a tape recorder 1 has a reel stand drive mechanism 2 provided on the lower surface side of a chassis base 3.

The chassis base 3 has a magnetic head 4 on the upper surface of the front center part.
The head base 6 equipped with the pinch row 25 is indicated by the arrow x1. X
It is designed to be movable in two directions. Base 6 is return spring 7
Due to the action of , it is always urged in the direction of arrow x2j5. The pinch row 25 is pivotally attached to the tip of a mouth-shaped pinch roller arm 1a that is rotatably supported by the head base 6 and urged to rotate counterclockwise by a torsion spring 9. Further, the pinch roller arm 10 comes into contact with a limiting protrusion 11 rising from the spacing base 6, and its rotation in the counterclockwise direction is restricted. The record bar 12 is indicated by the arrow X4. It is provided so as to be movable in the X2 direction, and is pressed and biased in the υ arrow X2 direction by the action of a return spring 150.

The rewind bar 18 has a square hole 21 at its tip, and is biased in the direction of arrow X2 by the action of a return spring 24. The protrusion 22a of the 11-shaped lever 22 and one end of the torsion spring 23σ are fitted into the square hole 21. Both the L-shaped lever 22 and the torsion spring 23 are fitted into the pin 20, and as the rewind parser 18 moves in the direction of arrow X1, they rotate counterclockwise, and the rewind par 18 returns in the direction of arrow X2. Especially when he returns. capstan 2
5, a drive gear 26 and a flywheel 2T are integrally provided at the lower part. 2 is a take-up reel stand to which a take-up reel stand tooth and turret 29 are fixed, and 30 is a friction unit that transmits rotation by friction to the take-up reel stand 28 via a slip mechanism (not shown). Gear (for the third transmission tooth; 31 is a supply reel base to which a supply reel base gear 32 is fixed; 33 is a take-up lever pivotally supported on the lower surface of the chassis base 3; a cap is always attached to the free end of the take-up lever; A pick-up gear (
1st transmission gear) 34 yjKllQhM. The take-up lever 33 is biased to rotate counterclockwise by the action of a torsion spring 350 whose one end is locked in a spring locking hole of the chassis base 3, and comes into contact with the restriction hook 36 of the head base 6 and latches. has been done.

37 indicates arrow x1°x2 along the back side of chassis base 3
This is an FF bar that moves in the direction. A mouth-shaped hook portion 4a is formed on the FF'FF bar 31, and one end of a dog-shaped lever 41 pivotally supported on the lower surface of the chassis base 3 is engaged with this hook portion 40. When moving in the direction of arrow X and force, the dog-legged lever 41 rotates clockwise and the FF bar 31
returns to p by returning in the direction of arrows X, -, and 9.4
2 is the return spring of the FF bar 3T, 43 is the take-up reel stand 2
It is a 97F gear (second transmission gear) that can be rotated by constantly meshing with the take-up reel base gear 29 fixed to the chassis base 3, and the action is pivotally supported by the sub-chassis 44 installed on the lower surface of the chassis base 3. It is pivotally attached to the distal end of the lever 45. At the other end of the action lever 45, a return C that urges the action lever 45 to rotate in the counterclockwise direction is engaged.
is positioned. The FF/rewind lever 48 has two flanged pins 49 on its lower surface that engage with the pick-up gear 34 during fast forwarding and rewinding operations to move the tape take-up reel stand 28 and the tape supply reel stand 31 in the winding direction. An FF/rewind gear (fourth transmission gear) 50 that transmits rotation in the rewinding direction is pivotally mounted. In addition, the lever 48 is made by inserting a pin 49 into two key-shaped holes 51 provided in the chassis base 3 from the bottom surface of the shark base 3.
It is provided so that it can move forward, backward, left, and right, and normally moves backward to the neutral position by the elastic action of the return spring 52.
1 will be held.

Each of the coil springs 53 and 54 has one end attached to the pins ss and se installed above the lever, and the other end of the spring 53 hooked to the hook of the L-shaped lever 22. It is provided in a state where the repulsive force of the spring 53 does not act. Further, the other end of the spring 54 is hooked to the hook portion of the doglegged lever 41, so that the repulsive force of the spring 54 is not applied thereto. Also, the lever 48 has a protruding piece 5T on the lower side on the right side of the center so that the torsion spring 23 comes into contact with it. Furthermore, motor 5
The rotational driving force of 8 is transmitted to the flywheel 2 via a belt 60.
transmitted to T. The stop lever 61 is indicated by the arrow X4. X2
It is provided so as to be movable in the direction -C. 6 is a return spring for the stop lever 61, and 65 is a lock plate for maintaining each operating state of recording, playback, fast forward, and rewind. It is configured to cancel each mode state.

66 is a stop button fixed to the stop lever 61, e7 is a playback button fixed to the head base 6, 68 is a recording button fixed to the record par 12, and 69 is a chassis base 30.
A fast forward operation button 7G is fixed to the lower surface of the chassis base 3, and a rewind operation button 7G is fixed to the rewind par 18 on the lower surface of the chassis base 3.

Next, the operation of the reel stand drive mechanism of the Y-recorder having the above configuration will be explained for each mode with reference to FIGS. 3 to 8.

(11 playback and bell mode (see Figure 3)) Press the playback button 6T to move the head base 6 in the direction of the arrow X1. At the same time, the pinch roller 5
At this time, the m'x tape 2 is connected to the capstan I1 1125 and the head 4 is attached to the tape 72. When ζ-, the limit hooks 36 of the base B move at the same time, so the pull-out brakeper 3
3 is Toe 7, Yombane 35.

The elastic force causes the capstan to rotate counterclockwise around the capstan shaft 25. A pick-up gear 34 which is pivotally attached to the free end of the winding reel 7 meshes with the pl and friction gear 30 which is rotated on the second day of the take-up reel table. Therefore, the rotational driving force of the motor 58 is determined by the drive tooth qj20, the tooth T tooth depth 34, and the friction lv? The take-up reel table 2 is rotated via the tube 30 to wind up the tape T2. At this point, the tape 12 is run in the forward direction along the magnetic head 4 for reproduction or recording.

(2) Fast-forward mode (see Figure 4) When the fast-forward operation button 69 is pressed, the FF bar 31 moves in the direction of arrow The F'F bar 31 is locked at this position.

At the same time, the dog-shaped lever 41 connected to the U-shaped hook portion 40 of the FF bar 37 rotates clockwise, and the lever 48 is moved to the take-up reel stand 2 through the coil spring 54 at its tip.
Drain to 81g 1l. For this reason, the FF' rewind gear 50 faces the pick-up gear 34. Also, a protruding piece T6 provided on the FF bar 37 and raised toward the lower surface pushes one end of the lever 45 to turn the FF'J1t43 supported on the other end.・Rewind (to engage with the car 50. For this reason, the hair - Yu 5
The rotation driving force of No. 8 does not pass through the friction teeth 430, but is applied to the pick-up southeast 34 and the FF/rewind gears 5Q, F"F.
The C winding reel table 8 is reached through a gear 43. Therefore, the take-up reel table 28 is driven at a higher rotation speed than in the reproduction mode, and the tape γ2 is wound up while running at a high speed.

(3) Rewind mode (see Figure 5) When you press the rewind operation button TO, the rewind par 1875
! Moving in the direction of arrow X, the protruding piece 77 provided on the rewind parr 18 slides on the diagonal portion of the lock plate 65 and is hooked on the hook portion. The L-shaped 1/bar 22 and the torsion spring 23, one end of which is fitted into the square hole 21 of the rewind par 18, rotate counterclockwise as the rewind par 18 moves.
When the other P end of the torsion spring 23 pushes the protrusion 57 of the lever 48 in the direction of the arrow
mesh with the f-up gear 34. In addition, the lever is connected via a spring 53 hooked to the tip of the 5-shaped par 22.
48 toward the supply reel stand 31 side, the FF/rewind gear 50 is meshed with the supply reel stand gear 32. Therefore, the rotational driving force of the motor 58 is applied to the pickup gear 34.
and FF Rewind 1ψ1! It is transmitted to the supply reel stand 31 via Ij50. Therefore, supply reel stand 3
1 rotates in the opposite direction to that in the playback mode and the magnetic tape T2
Rewind.

(4) Review mode (see Fig. 6) Fig. 6 shows a review state in which rewinding is performed during the playback mode of Fig. 3, and the rewinding operation button TO is pressed and the rewind bar 18 is moved in the direction of arrow x1. When it is moved, the protruding piece T7 provided on the rewind parr 18 slides on the inclined part of the cam 7'L/-)7B. Therefore, the cam plate 78 moves in the force direction of arrow Y, and rotates the release arm 80, which has a mouth-shaped tip and is pivotally supported on the chassis base 3, counterclockwise via the engaging portion of the cam plate γB. . Accompanying this, the pinch roller arm 10 that abuts the opening-shaped end of the release arm 80 rotates clockwise, and the pinch row 25 separates from the capstan 111+. The pickup lever 33 that contacts the other end also rotates clockwise, and the pickup gear 34 is pulled away from the friction gear 3.

Furthermore, as the rewind par 18 moves in the direction of arrow X and the force direction, the lever 48 moves toward the supply reel stand 31 side, and the FF/rewind gear 50 meshes with the reel stand drive gear 32 and the pick-up gear 34 to wind the wind. Return form WM!
,:Become. Therefore, the tape 72 is rewound while attached to the head 4. Incidentally, by releasing the suppression of the rewind button TO, the drive mechanism 2 automatically returns to the original reproduction mode.

, (5) J? UNIDO (See FIG. 7) FIG. 7 shows a cue state that causes fast forwarding during the playback mode of FIG. 3. Press the fast forward operation button 69 and move the FF bar 3T to the arrow x1
When the FF bar 31 is moved in the direction, the projecting piece T5 provided on the FF bar 31 slides on the inclined part of the cam brake (7g), thereby moving the cam plate T8 in the direction of the arrow Y1. Therefore, the IJ-sarm 80 is pushed by the retaining portion of the cam plate 78 and rotates counterclockwise. As the release arm 80 rotates, the pinch roller arm 10 rotates, and the pinch roller 5 releases the capstan 25J.

At the same time, the take-up lever 33 rotates clockwise,
Tick-up gear 34 is pulled away from S19 tooth if,3[1. Further, when the FF bar 37 moves in the direction of arrow X, the action lever 45 rotates clockwise, and the levers 4 and 8 move toward the take-up reel stand 28 side. Therefore, the FF/rewind gear 50 meshes with the FF gear 43 and the tear gear 34 to enter the fast forward mode.

Therefore, while the tape T2 is attached to the head 4,
When in playback mode, you can drive at high speed and fast forward). In addition, by releasing the suppression of the fast-forward operation button 69, the drive mechanism 2
returns to the original playback mode.

In this way, during the fast-forward and rewind modes and during the cue and review modes, an independent transmission path (from the tick-up gear 34 to the FF/rewind gear 50) is used instead of using the friction gear 31 that is different from the playback and recording modes. In addition, gears are used to drive the flywheel 27 and to transmit the driving force after the flywheel 27. Therefore, the take-up reel stand 28 and the supply reel stand 31 are reliably driven at high speed during the fast-forward or rewind mode, with little drive transmission loss.

In addition, each transmission gear has a take-up reel stand 2 and a supply reel stand 3.
Arranged so that it fits flatly within the triangle connecting the centers of 1 and flywheel 2γ! Furthermore, since the gear ratio is set to the minimum, it is advantageous in achieving miniaturization and thinning. In addition, the pick-up gear 34 uses the elastic force of the spring 35, and the FF/rewind gear 50 uses the coil springs 53, 5.
Since the rotation is made using the tensile force of 4, each operation button requires only a light pressing force, and mode changes can be performed easily.

Furthermore, a take-up gear 34 and an FF/rewind gear 5
0 is elastically engaged by the action of the spring, so it will not damage the rotation drive 11i K side wheel during mode conversion. Furthermore, by making each transmission gear housing J relatively soft synthetic resin, noise can be prevented even during high-speed rotational driving.

As described above, the reel stand drive mechanism of the Cheapleni''-da according to the present invention includes a drive gear that is driven integrally with the capstan Iil+, a displaceable first transmission wheel that meshes with the drive gear, and a winder. A take-up reel base gear that rotates integrally with the take-up reel base gear, a second transmission gear that meshes with the take-up reel base gear, and a take-up reel base gear that is provided coaxially with the take-up reel base gear. A third transmission gear with a larger diameter than the gear; a supply reel base gear that rotates integrally with the supply reel base; a fourth transmission gear that moves according to the mode; means for displacing the transmission gear to mesh with the third transmission gear; and a means for displacing the transmission gear to mesh with the third transmission gear;
The gear ratio is made as small as possible in order to displace the gear so that it meshes with the transmission gear of the first transmission gear and the second transmission gear, and meshes with the first transmission gear and the supply reel base tooth f during the rewinding mode. setting, downsizing the entire device, and
, The story of 4? ! +! By providing the 1tlt planarly on the side of the take-up reel table, it is possible to achieve a thinner profile and thinner bones. Since the take-up reel table is rotated through an independent transmission path from the gear to the fourth transmission gear, the tape winding speed does not change significantly due to fluctuations in tape winding resistance, eliminating transmission loss due to slip mechanisms. Moreover, the take-up reel table can be reliably driven at high speed, and therefore, there is no negative effect on tape running, such as when performing fast forwarding with the magnetic tape attached to the magnetic head, such as in cue mode. If the running resistance is large, or the running resistance fluctuates due to temperature and humidity changes, or the winding condition of the magnetic y'' is not uniform and uneven up and down, this may occur due to the frictional pressure between the upper and lower sheets in the cassette half. Tape running when resistance increases] (It has features such as being able to handle the increase in winding torque due to pile fluctuations, and can perform stable and reliable high-speed rotation with a relatively cylindrical mechanism. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a state in a stop mode of an embodiment of the reel stand drive mechanism of a tape recorder according to the present invention;
The figure is a side view of the reel drive mechanism shown in Figure 1, seen from the right side. Figures 3 to 1 show the reel in playback and recording mode, fast forward mode, rewind mode, review mode, and cue mode, respectively. FIG. 3 is a plan view showing the state of the table drive mechanism with portions related to each mode taken out; 1... Tape recorder, 2... Reel stand drive mechanism,
3... Sharn base, 4... Magnetic head, 5...
- Pinch roller, 6... Head base, 7. Is, 2
4゜42.4B, 52.84...Return spring, 9...
Torsion bar; I), 1 (1... pinch roller arm, 12
... Recokoto bar, 1B... Rewind bar, 22
...L-shaped lever, 23...Torsion spring, 25...
Capstan, 26... Drive gear, 27... Flywheel, 28... Take-up reel stand, 29... Take-up reel stand gear, 30... Friction tooth ho (third transmission gear) )
, 31... Supply reel stand, 32... Supply reel stand gear, 33... Tick-up lever, 34... Tick-up tooth (first transmission gear) 35... Tone spring, 3γ...・F' F bar, 41... doglegged lever, 43... FF tooth fE (second transmission gear) 45...
・Acunyong lever, 48... FF rewind lever, 49... Pin with flange, 50... FF rewind gear (fourth transmission gear), 51... Cram hole, 5
3, 54... Coil spring, 58... Motor, 80...
... Belt, 61 ... Stop lever, 65 ... Lock play 1-180 ... Stop button, 61 ... Playback operation button, 6B ... Recording operation button, 69 ... Fast forward υ operation Button, TO... Rewind operation button, γ2... Magnetic tape, γ
8...Cam plate, 80...Release arm

Claims (1)

[Claims] A drive gear that is driven integrally with the capstan shaft, a displaceable first transmission gear that meshes with the drive gear, and a take-up reel base gear that rotates integrally with the take-up series base. a second transmission gear meshing with the take-up reel base gear; a third transmission gear provided coaxially with the take-up reel base gear and having a larger diameter than the take-up reel base gear; , a supply reel base gear that rotates integrally with the supply reel base, a fourth transmission gear that moves according to the mode, and a fourth transmission gear that rotates in accordance with the mode;
means for displacing the transmission gear to mesh with the third transmission gear; and means for displacing the fourth transmission gear into mesh with the first transmission gear when in the fast forward mode.
A drive mechanism for a tape recorder comprising means for displacing the transmission gear so as to mesh with the transmission gear and the second transmission gear, and meshing with the first transmission gear and the supply reel base gear during a rewind mode. .