JPS6155183B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to video tape recorders (VTR).
Regarding magnetic recording and reproducing devices such as
This relates to the improvement of a tape mounting mechanism suitable for VTRs.

[Conventional technology]

Normally, in a magnetic recording/reproducing device such as a VTR, when pulling out a magnetic tape from a tape cassette, a pair of drawer members each having a post for drawing out the tape is provided, as shown in Japanese Utility Model Publication No. 53-9294, for example. Power from the drive source moves both members in opposite directions around the cylinder drum via wires, pulls out the magnetic tape from the cassette, and wraps the pulled-out magnetic tape around the cylinder drum at a predetermined angle, performing a so-called loading operation. It's summery.

However, this type of conventional device particularly requires a dedicated motor capable of forward and reverse rotation as a drive source for moving the pull-out member, and has the disadvantage of being expensive.

[Problem that the invention seeks to solve]

Therefore, in the present invention, taking the above points into consideration, it is an object of the present invention to provide a means that eliminates the need for a dedicated motor for drawing out the magnetic tape and allows the tape to be pulled out and released by the rotational driving force of an existing motor. Consider it a technical issue.

[Means for solving problems]

The magnetic recording and reproducing apparatus of the present invention includes a tape mounting member that moves a magnetic tape pulled out from a tape cassette to the periphery of a rotating magnetic head, and a tape mounting member that moves the member in a tape pull-out direction and a pull-out release direction using forward and reverse rotational forces. a mounting member comprising a means for driving a member to be moved; a driving gear integrally provided on a capstan rotated by a capstan motor; and a group of gears connected to the means and selectively meshing with the driving gear; connected to the mounting member;
a position where the drive gear is connected to the means through an even number of gears in the gear group, a position where the drive gear and the gear group are separated, and a position where the drive gear is connected to the means through an odd number of gears in the gear group. a seesaw lever rotatably supported at the other end of the sliding body;
two solenoids connected to both ends of the seesaw lever, and the sliding body is slid to each position by de-energizing both solenoids, energizing one of the solenoids, and energizing both solenoids. It is characterized by the following.

[Effect]

Therefore, when two solenoids become de-energized or energized at the same time, the sliding body slides a predetermined distance from one direction to the other or from the other direction to one direction, and one of the solenoids becomes energized. Then, the sliding body slides from one direction to an intermediate position of the movement range in the other direction, respectively actuating the mounting members.

That is, the gear group of the mounting member selectively meshes with the drive gear by the sliding movement of the sliding body in three positions due to the energization and de-energization of each solenoid described above, and the member driving means engages with the even number of gears in the gear group. It can be switched between a state in which it is connected to the drive gear via the drive gear, a state in which it is separated from the drive gear, and a state in which it is connected to the drive gear through an odd number of gears in the gear group.

As a result, by simultaneously energizing (de-energizing) both solenoids and connecting the drive gear to the means through an even number of gears, rotation of the drive gear in one direction by the capstan motor causes the drive gear to be energized. The rotational force in the direction is transmitted, and the tape mounting member moves in the tape drawing direction to perform a so-called loading operation.

Further, when only one of the solenoids is energized, the means is separated from the drive gear, and the magnetic tape can be fed by rotation of the capstan by the capstan motor.

Furthermore, both solenoids are de-energized (energized) at the same time.
By connecting the driving gear to the means through an odd number of gears, rotation of the driving gear in one direction transmits a rotational force in the opposite direction to the means,
The tape mounting member moves in the drawer release direction to perform a so-called unloading operation.

〔Example〕

Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.

First, FIG. 1 shows the state after the magnetic tape has been loaded (after loading has been completed), and the magnetic tape 2 of the tape cassette 1 installed at a predetermined position in the main body of the apparatus is installed at the tape entrance/exit end of the tape cassette 1. The tape is drawn out in a loop in contact with two tape guides 3 and 4, and is mounted on a predetermined tape running path as shown in the figure. Note that 2 indicates the position occupied by the magnetic tape before mounting.

5 is a supply side reel stand, 6 is a take-up side reel stand, 7
1 is a cylinder drum having a rotating magnetic head, 8 is a tension regulator, and 9 is a tape pull-out member.As the tape is loaded, a wire (to be described later) moves the tape from position 9 ₁ indicated by the two-dot chain line to the position indicated by the solid line. 9 Rotate to ₂ .

10 is a tape guide, 11 is an erasing head, 12
is a guide roller.

Reference numerals 13 and 13b denote a pair of tape mounting members that move approximately along the outer circumference on both sides of the cylinder drum 7, and when the tape is mounted, they are moved to positions 13a ₁ and 13b indicated by two-dot chain lines by respective wires to be described later. ₁ to the solid line positions 13a ₂ and 13b ₂ .

13'a and 13'b are positioning members for positioning the members 13a and 13b at tape loading positions 13a ₂ and 13b ₂ , respectively; 14 is a guide roller; 15 is an audio control head; 16 is a tape guide;
7 is a pinch roller, 18 is a capstan, 19
Reference numerals a and 19b are guide means for guiding the movement of the tape mounting members 13a and 13b.

20 is a wire for moving the tape drawing member 9; 21a and 21b are tape mounting members 13a and 1;
The wires 22a and 22b are wires that release the tape mounting by the tape mounting members 13a and 13b, and each wire 20,
21a, 21b, 22a, and 22b are each supported under tension by guide rollers as shown.

Reference numeral 23 denotes a wire winding reel, and a worm wheel 24' is integrally provided on the rotating shaft 24 of the reel. A worm gear 25 is integrated with the worm gear shaft 26 and meshes with the worm wheel 24'. 27 is the sub chassis, reel 2
3 and a worm gear 25 are rotatably mounted on their shafts. And these 23-2
The tape drawing member 9 and the mounting members 13a, 1
3b to the wires 20, 21a, 21b, 22a, 2
A member driving means for moving the member via 2b is configured.

Reference numeral 28 denotes a tape rewinding idler, which is supported by the first end of a T-shaped attachment lever 29. This mounting lever 29 is located at its center (intersection)
It is swingably supported using the fulcrum as a fulcrum. 30 is a solenoid whose operating rod is connected to the second end of the mounting lever 29; 31 is a tape winding idler supported on a lever connected to one end of the rotatable mounting lever 32; There is. 33 is a connecting lever, and 34 is a solenoid whose operating rod is connected to the other end of the mounting lever 32 via the connecting lever 33.

35 is a motor that rotationally drives the idlers 28 and 31, and 36 is a capstan motor that rotationally drives the capstan 18.

Further, in FIG. 2 showing the lower part of the mechanism shown in FIG. 1, numeral 37 is a connecting gear that is provided integrally with the worm gear 25 and constitutes a part of the member driving means, and 38 is a flywheel 39 that is integral with the capstan 18. and a belt 40 that connects the capstan motor 36 and rotates the flywheel 39.
is a drive gear provided integrally with the flywheel 39.

41, 42, 43, and 44 are gears that are rotatably supported by the gear mounting member 45 and constitute a gear group. While meshing, the gears 42 and 44 each drive the drive gear 4.
Selectively engages with 0. This mounting member 45 is attached to a fixed member 47 on the device base via a rotation support shaft 46.
The gear 42 is rotatably supported by the drive gear 40 and is rotatably biased by a spring 64, and in response to this bias, the gear 42 normally meshes with the drive gear 40, causing the mounting member 45 to resist the bias. By rotating the gear in the counterclockwise direction, the gear 42 is separated from the drive gear 40, and then the gear 44 meshes with the drive gear 40.

48 is an engagement pin provided on the gear attachment member 45; 49 is a steride whose one end is connected to the engagement pin 48 and rotates the gear attachment member 45;
It can be moved in the longitudinal direction, that is, in the vertical direction (Y direction) in the figure, by engaging with slide shafts 50 and 51 that protrude from the base. 52 is a support shaft provided at the other end of the slide 49; 53 is supported by the support shaft 52, and the slide 4
A seesaw lever in a direction substantially perpendicular to 9, 5
4 and 55 are engagement pins provided at both ends of the seesaw lever 53, the lever 33 of the solenoid 34 is rotatably engaged with the engagement pin 54, and the lever 56 is rotatably engaged with the engagement pin 55. The lever 56 is rotatably engaged with an engagement pin 57 on the third end side of the mounting lever 29.

Note that the distance that the engagement pin 54 can move in the Y direction is approximately equal to the distance that the engagement pins 57 and 55 can move in the Y direction. Further, the support shaft 52 is located approximately in the middle between the two engaging pins 54 and 55.

58 is a drive belt that connects the relay pulley 59 supported by the third end of the mounting lever 29 and the motor 35; 60 is a pulley 61 that rotates coaxially with the idler 28; and a small pulley that is integrated with the relay pulley 59; It is a drive belt that connects the

Reference numerals 62 and 63 indicate positioning means for the gear mounting member 45, which protrude from the base.

Next, the operation of the embodiment will be explained.
At the first time when the tape cassette 1 is installed in a predetermined position in the main body of the apparatus, the tape pull-out member 9 and the tape mounting members 13a, 13b are not connected to the tape cassette 1.
Positions 9 ₁ , 13 inside the cylinder drum side opening of
a ₁ , 13b ₁ and is in the state when the tape mount is released.

At this time, since both solenoids 30 and 34 are in a de-energized state, the slide 49 is in the first position via the seesaw lever 53 in response to the biasing force of the spring 64 of the mounting member 45, and the mounting member 45 is positioned. Abutting the means 62, the gear 42 meshes with the drive gear 40, the drive gear 40 having two gears 42,
It is connected to the connecting gear 37 via 41.

Then, in connection with a press operation being applied to an operation button for recording or reproducing, an excitation current flows through both of the two solenoids 30 and 34.
As a result, the tape pull-out member 9 and tape mounting members 13a, 13b are moved to positions 9 ₂ , 13a ₂ , 13
b ₂ respectively, and tape loading is achieved automatically.

That is, here, when the excitation current is supplied only to the solenoid 30, the solenoid 30 performs a suction operation, and this operation is caused by the lever 29, the engagement pin 57,
The force is transmitted to the seesaw lever 53 through the lever 56 and the engagement pin 55, and the seesaw lever 53 rotates about the engagement pin 54 as a fulcrum. Further, when the excitation current is supplied only to the solenoid 34, the attraction action of the solenoid 34 is transmitted to the seesaw lever 53 through the lever 33 and the engagement pin 54,
The seesaw lever 53 rotates about the engagement pin 55 as a fulcrum. In either case, the slide 49 moves downward in the figure together with the support shaft 52, although the amount of downward movement of the engagement pin 54 or 55 is about half. Furthermore, when excitation current is supplied to both solenoids 30 and 34 at the same time, the two engagement pins 54 and 55 move in parallel downward in the figure, and the slide 49 moves by an amount equivalent to the amount of movement of the engagement pins 54 and 55. do.

Therefore, when both solenoids 30 and 34 are simultaneously excited and perform a suction operation, the slide 49 and the engagement pin 48 move downward in the figure, as shown in FIG. 3, and the gear mounting member 45 is rotated. It rotates counterclockwise about the shaft 46 as a fulcrum. Then, the gear 42 and the driving gear 40 are disengaged, and the driving gear 40 and the connecting gear 37 are separated (the position of the slide 49 at this time is referred to as the second position), and after this state, the gear 44 is The slide 49 meshes with the drive gear 40 (the position of the slide 49 at this time is referred to as a third position). That is, the drive gear 40 has three gears 4
This means that it is connected to the connecting gear 37 via 4, 43, and 41.

At this point, the capstan motor 36
When power is supplied to the motor 36, the rotational power of the motor 36 is transmitted to the flywheel 39 and the drive gear 40 through the belt 38, and the gear 40 rotates clockwise.
Then, the gears 44, 43, 41, 37, the worm gear shaft 26, and the worm gear 25 rotate, and the wire take-up reel 23 rotates counterclockwise.

Since the wires 20, 21a, and 21b are connected to the wire take-up reel 23 via springs, these wires are wound by the rotation of the reel 23, and the tape pull-out member 9 and the tape loading member are 13a, 13b are pulled out, and the magnetic tape portion pushed upward in the figure by the tape mounting members 13a, 13b is as shown in FIG.
tape guide 10, erasing head 11, guide roller 12, cylinder drum 7, guide roller 14,
It is pressed against the audio control head 15, tape guide 16, etc.

The wire take-up reel 23 is attached to the tape mounting member 1
3 rotates until it is positioned by the positioning means 13'a, 13'b.

Then, a detector (not shown) detects that the wire take-up reel 23 has rotated by a predetermined amount, and the suction operation of the solenoid 34 is canceled based on the detection output.

The state at this time is as shown by the broken line in FIG. 4, and even though the suction operation by the solenoid 34 is released, the suction operation by the solenoid 30 continues, so the amount of movement of the slide 49 in the Y direction is halved. 1, the slide 49 stops at the second position, the gears 42 and 44 are both separated from the gear 40, and the wire take-up reel 23 is stationary. In addition,
Reverse rotation of the reel 23 is prevented by the worm gear 25, the worm wheel of the wire take-up reel 23, and the like.

In such an operating state, the motor 35 is rotated, and the rotational power is transmitted to the take-up reel stand 6 through the drive belt 58, relay pulley 59, drive belt 60, pulley 61, rewind idler 28, and idler 31. , the magnetic tape 2 is wound up by the pinch roller 1.
7 and a capstan 18.

Next, in the state shown in FIG. 1, when the stop push button is operated, a signal to release the attraction is given to the solenoid 30, which had been continuing the excitation operation, and both solenoids 30 and 34 are released from attraction, as shown in FIG. Transition to the state shown.

Therefore, the rotational power of the motor 36 is transmitted through the belt 38, flywheel 39 and gears 40, 4.
2 and 41 to the gear 37, and the gear 37
rotates counterclockwise, opposite to what it was before, and reel 23
rotates clockwise. And the wire 22a,
22b, the tape mounting members 13a, 1
3b moves to the unloading positions 13a ₁ and 13b ₁ .
Further, the tape pull-out member 9 returns to the unloading position ₉₁ by a spring or the like (not shown).

At this time, the rewinding idler 28 is in pressure contact with the supply reel stand 5 as the solenoid 30 is de-energized, so the rotational power of the motor 35 can be transmitted to the supply reel stand 5, and the The magnetic tape 2 when the rack is released is wound onto a reel (not shown) fitted onto the supply reel 5. In addition, a signal from a detector (not shown) that detects that the wire take-up reel 23 has rotated a predetermined amount cuts off the power supply to the motor 36, so the rotation of the reel 23 is stopped.
The unloading operation ends.

Further, when a push button for fast forwarding or rewinding is pressed, only one of the solenoids 30 and 34 is operated for suction, so the slide 49 moves to the second position and the gears 42 and 44 move to the second position. Both are located at the neutral point shown in FIG. 4, which is separated from the gear 40, and the rotational power of the motor 36 is not transmitted to the wire take-up reel 23, so that the tape loading operation and unloading operation are not performed. However, even in this case, it is desirable for safety to cut off the power to the motor 36.

In the above embodiment, recording and playback are performed with the tape loaded, and fast forwarding and rewinding are performed with the tape unloaded. However, recording, playback, and playback are performed with the tape loaded.
Operations such as fast forwarding and rewinding can be performed, and the operation of the record and playback buttons can be replaced with a cassette loading operation, and the stop button operation can be replaced with a cassette ejection operation.

Further, the tape mounting switching mechanism according to the present invention can also be applied to tape mounting means using a ring.

〔Effect of the invention〕

As described above, according to the magnetic recording and reproducing apparatus of the present invention, the loading and unloading operations of the magnetic tape can be performed using the rotational power of the existing capstan motor, and furthermore, This operation can be performed without any hindrance to the tape running by the capstan motor, and there is no need to provide a dedicated motor for loading and unloading the tape, resulting in lower costs.

Furthermore, by only controlling the energization and de-energization of the two solenoids, it is possible to apply rotational force in the forward and reverse directions to the member driving means by rotating the capstan motor in one direction. There is no need to switch the rotation direction at all, and the mechanism for switching the rotational direction can be constructed with a relatively small number of parts, which has the advantage of improving productivity and reducing costs.

[Brief explanation of the drawing]

The drawings show one embodiment of the magnetic recording and reproducing apparatus of the present invention, and FIG. 1 is a plan view after loading the tape;
Figure 2 is a plan view of the lower layer before tape installation;
FIGS. 3 and 4 are explanatory diagrams of the operation of the main parts. 1... Tape cassette, 2... Magnetic tape, 7
... Cylinder drum, 13a, 13b ... Tape mounting member, 18 ... Capstan, 23 ... Wire winding reel, 30, 34 ... Solenoid, 3
6... Capstan motor, 40... Drive gear,
41-44...gear, 45...gear mounting member, 4
9...Slide, 53...Seesaw lever.

Claims (1)

[Claims] 1. A tape mounting member that moves the magnetic tape pulled out from a tape cassette to the periphery of the rotating magnetic head, a member driving means that moves the member in the tape draw-out direction and the draw-out release direction using forward and reverse rotational forces, A drive gear integrally provided with a capstan rotated by a capstan motor,
a mounting member having a set of gears coupled to said means and selectively meshing with said drive gear; one end coupled to said mounting member to connect said drive gear to said means through an even number of gears of said set of gears; a sliding body that slides to a connecting position, a position where the driving gear and the gear group are separated, and a position where the driving gear is connected to the means via an odd number of gears of the gear group; It is equipped with a seesaw lever rotatably supported at the other end of the moving body, and two solenoids connected to both ends of the seesaw lever. A magnetic recording/reproducing device characterized in that the sliding body is caused to slide to each of the positions by excitation.