JPS63113846A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily execute the operation and release of a brake in the course of a recording pause mode, by controlling the control mechanism of a reel base through three pieces of arms driven by a prescribed cam. CONSTITUTION:First and second arms 8a, 8b are provided freely turnably in a shape superposed at the upper and lower parts on the supporting shaft of a chassis 4, and driven by an cam gears 5a, 5b, respectively. Also, a third arm 9 abuts against the other end of the first and the second arms, and to constitute the brake mechanism of a reel base. In this state, when the brake operation is being released in a recording pause mode, when the arm 9 is moved against the spring force by the arm 8b, the brake operation can be set to an operating state from the release, and a tape added and racked to a cylinder can be carried without sagging it. Also, the brake can be released easily by releasing the arm 8b.

Description

[Detailed Description of the Invention] [Fields of Application] The present invention relates to a video tape recorder (hereinafter abbreviated as VTR).
The present invention relates to a brake crushing/releasing mechanism for braking the IJ-ru base of a cassette type magnetic recording/writing device such as the above.

[Conventional technology]

In the conventional apparatus, as shown in Japanese Patent Application Laid-Open No. 53-66716, for example, when the mode is changed from recording/playback to recording pause, the king brake remains released from the reel stand. However, with the portable type, if you carry the device around in the recording pause state, there is a risk that vibration will be transmitted to the mechanism and cause the tape to sag. A method using a plunger to release the brake layer has been proposed.However, when a plunger is used, there is a problem of increased power consumption.On the other hand, there is no mention of brake operation during recording pause. However, a system in which the brake is controlled in conjunction with a load ring that attaches the tape to the rotating cylinder and does not use a plunger is provided, for example, in Japanese Patent Laid-Open No. 57-130258.

[Problem that the invention seeks to solve]

According to the above-mentioned prior art, the plunger type requires a considerable amount of electric power in order to obtain sufficient staying power to release the push-pull brake, and there are also problems with reliability. This is because in the case of portable type VTRs that must save power, especially VTRs with built-in cameras, the above method cannot be adopted because the battery usage time is short.In addition, in the latter case, due to the combination of gear trains, The number of parts is still large, and it is expected that the mechanism will become complicated if the brake mechanism is activated/released in an intermediate mode.

It is an object of the present invention to provide a brake operation mechanism that performs a brake pressure M operation for reel stand braking in a REC Bose without increasing the number of parts and simplifying the mechanism.

[Failure to solve the problem]

In order to achieve the above object, the present invention has a cam gear that is driven by a motor and rotates at the same time, and a pin that resides in a cam groove or cam with two different loci arranged on the cam gear and is slidable at one end. A first arm and a second arm are provided which are pivotally supported on a common shaft and are rotatable in a vertically overlapping manner.

The other ends of the first arm and the second arm are brought into contact with the third arm, and the moving mechanism of the conduit 5 arm is used to
A fifth arm is arranged to transmit power for activating and/or releasing a brake operation mechanism that moves the reel stand, and while the first arm moves the third arm and releases the brake operation, the second The third arm is moved by an arm against a spring force to activate a brake operation, and when the restraint of the second arm is released, the brake operation is returned from operation to release. It is something.

[Effect]

The magnetic recording/reproducing device having the brake operation mechanism configured as described above moves the cam groove trajectory KG of the cam gear in the order of stopping → loading/unloading → recording/reproducing (hereinafter referred to as recording/reproducing) the first arm. , move the third arm to stop → a mead/unload, and move the third arm to P.
The brake is moved to the gr position, and the brake of the brake operating mechanism is changed from the activated state to the released state. However, since the recording standby (hereinafter referred to as recording pause) mode is between a-do/un-a-do and recording/playback, the above-mentioned 1JJ2 arm is moved by another cam KG of the cam gear, and the third arm is moved a predetermined amount (in the opposite direction to the movement by the first arm) against the spring force of a spring incorporated in the third arm, thereby performing a braking operation. Transition the mechanism from the released state to the activated state. Also, when moving from recording mode to a-do/and-a-do or recording/playback, the second arm is moved away from the contact position of the third arm, so the third arm is moved to the operating position during play due to the spring force. Can return.

〔Example〕

Hereinafter, an actual flow example of the present invention will be explained based on the drawings.

Figure 1 is a plan view showing the entire human power in a stopped state, with 1α
, l are a pair of reel stands that rotationally drive a reel (not shown) stretched over the magnetic tape 1, and 2α and 2b are reel stands 1α and 1b K Nao-Ayu (a clutch with a built-in torque limiter for transmitting power). Yes, the clutches 2a and 2b
Brake arms 3α, 5 installed close to the sides of the brake arms 3α, 5
b, and rubber is attached to the contact portions with the clutches 2α and 2b.

FIG. 2 is a diagram of the entire mechanism seen from the opposite side to that shown in FIG.
, 5b are driven and rotated by a motor 6. The cam gear 5α is equipped with a cam having two types of trajectories, one of which is eject (up 14 cassettes) → stop → fast forward 7 rewind → a-do/unload (tape drawer)
→It is divided into 5 modes such as recording and playback, and the rotation angle assignment for each mode is set by the rotation angle using the mode switch 7.

The other cam has a protrusion instead of a cam groove, and the mode is set so that the arm moves a predetermined amount only during recording pauses. It can slide along the cam trajectory along the pin and side surface of the cam groove and cam of the former cam 5a, respectively, and is one of the two arms that is pivotally supported vertically on the shaft installed in the shaft 74. , the member that slides in the cam groove is the arm 8α of wJl, and the member that moves so as to overflow the side surface of the cam is the second arm 8b, and these two arms 8
The cam sliding end and the other end of α and 8b can come into contact at different positions with the third arm 9, which is rotatably supported by a shaft installed in the chassis 4. .

FIG. 7 shows the configuration of the third arm 9 from the back side. A torsion spring 10 is installed around the rotation axis of the third arm 90, and one end of the spring 10 is hooked to the third arm,
The other end is pressed against the chassis 4, and the end 9d of the third arm is urged in the direction of arrow A with a predetermined load. The implanted pin of the first arm contacts the portion 9b of the third arm, and the position of the tip 9d of the third arm is regulated. wc1
When the pin of the arm is removed from the portion 9b of the third arm, the tip 9d moves in the direction A by the force of the spring. At this time, the protrusion 9a comes into contact with the chassis 4 and acts as a stopper, and the protrusion 9d does not move further in the A direction. Further, the other end of the second arm 8b can come into contact with 9Cs of the third arm 9.

It is set so that it makes contact in the recording pause mode and does not make contact in other modes. The tip 9cL of the third arm abuts at the center of both pivots of a pair of adjacent brake arms 3α, 3b. When the tip 5+LL moves in the direction A, the brake arms 3α, 5b also move, and the rubber portions at the tips separate from the side surfaces of the clutches 2α, 2b. The brake arms 3α, 3A are provided with a joint between them and the two brake arms 3α, 3b. The clutches 2α and 2b have a built-in torque limiter, and are a mechanism that can extract a desired torque.

Next, FIGS. 3 to 6 are operation explanatory diagrams showing the four modes of stopping the operation from the cam gear 5α to the fifth arm 9, a-do/un-a-do, recording/playback, and recording pause. . FIG. 3 shows the operating states of the first arm 8α, the second arm 8b, and the fifth arm 90 in the stop mode. Since the pin of the nest 2 arm 8α comes into contact with the 9b portion of the third arm 9,
The position of the tip 9d of the BWJ5 arm 9 is restricted to the chassis 4 side, and there is a gap between it and the brake arms 5a and 3h, so that the brake is in operation. Further, the tip of the second arm 8b is connected to the end 9C of the fifth arm 9.
have no contact with.

FIG. 4 shows the operating state in the a-do/and-a-do mode. The first arm 8α moves in the direction of arrow B, and in order to separate from the end 9b of the third arm 9, the end 9d moves in the direction A by the force of the spring 10 until the stopper 9α comes into contact with the chassis. , the above brake arms 3α, 5h are A
push in the direction. A gap is created at the contact portion of the brake arms 3α, 3b with the clutches 2α, 2b, and the braking operation is released. Furthermore, the second arm 8b does not move and does not come into contact with the end 9C of the fifth arm 9.

FIG. 5 shows the operating state in REC Bose mode. The first arm 8α does not come into contact with the end 9b of the third arm 9 even at the same position as the a-do/a-do. 2nd above
Since the arm 8b moves while staying on the protruding part of the cam of the cam gear 5α, the other end of the second arm 8b moves in the direction opposite to the arrow B, and the third arm 9 '1FtA @9C
Push in the opposite direction to B, resist the load of spring 10, and press S'da
S9d, is returned in the opposite direction to the arrow l, and is in the same position as in the stop mode in Fig. 3, and the brake arms 5α, 3b
The brake operation is activated.

FIG. 6 shows the operating state in the recording/playback mode. The first arm 8α moves in the B direction and does not come into contact with the end 9b of the third arm 9. The second arm 8b is connected to the third arm 8b in FIG.
The end 9C of the arm 9 is restrained, and the end 9d is not in contact with the brake arms 3α, 5b. However, since the second arm 8b moves away from the cam protrusion of the cam gear 5α, the third arm 9 is restrained. Since it is in a non-contact position away from the end fFS9c, the arm 9d moves in the A direction with a spring force of 10, creating a gap between the brake arms 3α and 5b and the clutches 2α and 2b, and the brake is released.

〔Effect of the invention〕

As explained above, according to the present invention, in the recording Bose mode, the brake operation of the reel stand control brake is changed from released to activated, so that the tape attached to the cylinder can be carried around like a camera-integrated VTR without slackening. It is suitable for the type of person who

Also, it can be used without increasing the number of parts or complicating the mechanism.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, and are an explanatory diagram of one embodiment of the present invention; FIG. 4 is an explanatory diagram of braking operation during loading/unloading; FIG. 5 is an explanatory diagram of braking operation during recording pause;
FIG. 6 is an explanatory diagram of the braking operation during recording and playback, and FIG. 7 is an explanatory diagram of the operation of the third arm 9.

Claims (2)

[Claims] (1) In a magnetic recording and reproducing device that runs a magnetic tape along a fixed path, a cam gear that is driven and rotated by a motor is provided with cam grooves or cams that have two different trajectories, and a cam gear that is driven and rotated by a motor. It has a first arm and a second arm that are pivotally supported and rotatable so as to overlap each other, and one ends of the first arm and the second arm are slidable along the cam groove or the cam. , the other end is linked to move a rotatable third arm to a shaft pivotally supported by the chassis, and the other end that does not come into contact with the first arm and second arm of the third arm . A magnetic recording and reproducing device comprising a transmission mechanism that is linked to a reel stand or a brake mechanism that brakes a gear directly connected to the reel stand, and that controls the braking operation of the brake mechanism by movement of the third arm. (2) In claim 1, when the first arm releases the brake operation of the brake mechanism,
While the tape is running in the recording standby mode, the second arm operates the brake mechanism of the third arm, and when moving to the adjacent mode, the second arm is moved to the third arm. 1. A magnetic recording/reproducing apparatus characterized in that the third arm is configured to release the braking operation of the brake mechanism by using a spring force by releasing the restraint of the third arm.