JPH073467Y2 - Recording or reproducing device for magnetic tape - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for recording and reproducing video signals and the like on a magnetic tape (hereinafter referred to as a video tape recorder), and more particularly to a magnetic tape of a loaded magnetic tape cassette. The present invention relates to a configuration for switching the torque when rotationally driving a reel wound around.

2. Description of the Related Art Generally, in a video tape recorder, when a magnetic tape cassette, in which a magnetic tape is wound around a pair of reels and stored, is loaded inside, a predetermined portion of the magnetic tape is pulled out from the magnetic tape cassette by a loading mechanism and is rotated. It becomes a recording / reproducing loading state wound around the head cylinder. After the recording / reproducing of the magnetic tape is completed, the magnetic tape is placed in the magnetic tape cassette and is in an unloading state. That is, in the video tape recorder, when the operating state is switched between the loading state and the unloading state, the fixed torque of the mechanism for driving and driving the magnetic tape changes.

That is, the torque is low during reproduction or recording, and high during rewinding or fast-forwarding.

FIG. 6 is a plan view of a conventional torque switching device 1 for performing such torque switching. The torque switching device 1 includes a gear-shaped loading cam member 2 having teeth formed on the outer peripheral surface in the radial direction. A cam groove 3 is formed in the cam member 2 in a substantially spiral shape. Angular displacement is driven around the axis of the pivot 4 in the direction A1 or the direction A2.

A swing member 6 having a guide pin 5 as a follower that slides with the cam groove 3 is provided so as to be angularly displaceable around the axis of the pivot 7 in the arrow A3 direction or the arrow A4 direction. Teeth 8 are formed on the rocking member 6, and a loading gear 9 meshes with the teeth 8.

A gear-shaped torque switching cam member 10 that meshes with the loading cam member 2 is provided around the axis of the pivot 11 so as to be angularly displaceable in the arrow A5 direction or the arrow A6 direction. A guide pin 13 that is a follower that slides in the cam groove 12 of the cam member 10.
And a drive lever 14 having a substantially doglegged shape is provided so as to be angularly displaceable around the axis of the pivot 15.

In the torque switching device 1 as described above, the loading gear 9 pulls out the magnetic tape of the magnetic tape cassette from the inside of the magnetic tape cassette and displaces the magnetic pole so that the magnetic tape is wound around the rotary cylinder of the video tape recorder (see FIG. (Not shown) is fixed, and a loading arm for driving the displacement of the fixed arm is fixed. That is, in response to the angular displacement of the loading gear 9 in the direction of arrow A7 or A8, the loading pole is displaced toward / away from the rotating cylinder (not shown). When the video tape recorder is switched between the loading state and the unloading state according to the angular displacement of the loading gear 9, the drive lever 14 moves in the arrow A9 direction or the arrow A10 direction around the axis of the pivot shaft 15. The drive levers 14 are each angularly displaced, and the drive lever 14 drives a torque generating mechanism (not shown) that generates a plurality of torques having different strengths in response to each angular displacement operation. Switch between torque.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the torque switching device 1 having the above-described configuration, for example, in a video tape recorder provided with such a torque switching device 1, the running state of the magnetic tape is the loading state and the unloading state. (For fast forward / rewind state, etc.). Further, in both of these states, it is possible to switch the degree of the rotational torque required to drive the magnetic tape.

On the other hand, such a conventional technique has a problem that the torque switching cam member 10 shown in FIG. 6 is required, and thus it is difficult to reduce the size of the configuration.

It is an object of the present invention to provide a magnetic tape recording or reproducing apparatus that can be simplified and miniaturized.

The present invention provides a first shaft 40 for loading magnetic tape.
A cam that is rotationally driven in the first direction C1 around the axis of rotation and is rotationally driven in the second direction C2 that is the opposite of the first direction C1 for unloading and that is formed in a substantially spiral shape around the first axis 40. A cam member 37 having a groove 41 and a follower 42 that slides in the cam groove 41 are provided, and are angularly displaceable around a second shaft 43 provided at a position farther from the first shaft 40 than the cam groove 41. A swinging member 38 having teeth 44 formed in the circumferential direction, and a loading gear 29 meshing with the teeth 44 of the swinging member 38,
Means 25 to 28 for loading and unloading the magnetic tape by the angular displacement of the rocking member 38 due to the rotational driving of the cam member 37, the drive piece 46 projecting from the rocking member 38, and the rocking member 38. A drive lever 48 that is angularly displaced about a third axis 47 in the vicinity in a third direction C5 and a fourth direction C6 that is the reverse of the third direction C5, and a spring that applies a spring force about the third axis 47 to the drive lever 48. 53
When the follower 42 is projectingly provided on the drive lever 48, and the follower 42 is slidably displaced in the cam groove 41 and is located at one of the radially outer side and the inner side of the cam member 37, the follower 42 abuts on the drive piece 46. The drive lever 48 includes an abutment piece 49 that is angularly displaced against the spring force of the spring 53, and the spring 53 has a follower 42 slidably displaced in the cam groove 41 so as to be radially outward of the cam member 37. When either of the inner positions is in the other position, the contact piece 49 applies the spring force so as to separate from the drive piece 46, and further corresponds to the angular displacement state of the drive lever 48, which corresponds to the cam member 37. First
Due to the angular displacement of the drive lever 48 in the third direction C5 due to the rotational drive in the direction C1, a low torque is generated to cause the magnetic tape to run, and the fourth direction of the drive lever 48 due to the rotational drive of the cam member 37 in the second direction C2. A magnetic tape recording / reproducing apparatus comprising: a torque generating unit 51 that generates a high torque by the angular displacement of C6 to run the magnetic tape.

According to the present invention, the cam member 37 is selectively driven to reciprocate angularly about the first shaft 40 in the first direction C1 and the opposite second direction C2 for loading and unloading the magnetic tape. Has a cam groove 41 formed in a substantially spiral shape around the first shaft 40, and a follower 42 that slides in the cam groove 41 is provided in the swing member 38, and therefore the cam member 37 is angularly displaced. By being driven, the follower 42 slides and displaces in the cam groove 41, and the follower 42 moves to a radially outer position and a radially inner position of the cam member 37,
As a result, when the follower 42 is located at either the radially outer position or the radially inner position, the contact piece 49 projecting from the drive lever 48 contacts the drive piece 46 and springs.
When the follower 42 is angularly displaced against the spring force of 53 and the follower 42 is located at the other of the above-mentioned positions, the contact piece 49 causes the drive piece 46 to move.
Away from the magnetic tape, the degree of the torque generated by the torque generating means is changed according to the displacement state of each position of the drive lever 48 due to the displacement of the contact piece 49, and the magnetic tape is run. It The rotational movement of the cam member 37 causes the oscillating member 38 to be angularly displaced, and the teeth 44 formed in the circumferential direction of the oscillating member 38 have the loading gears of the means 25 to 28 for loading and unloading the magnetic tape. 29 meshes with each other, and therefore a swing member driven by the rotation of the cam member 37.
The angular displacement of 38 allows the magnetic tape to be loaded and unloaded. Therefore, the torque switching cam member 10 described with reference to FIG.
Can be omitted, the configuration can be simplified,
It can also be miniaturized.

Embodiment FIG. 1 shows a magnetic tape recording / recording of video signals according to the present invention.
FIG. 2 is a simplified plan view of a reproducing device (hereinafter abbreviated as a video tape recorder) 20, and FIG. 2 is a bottom view of the video tape recorder 20. Referring to FIG. 1 and FIG.
The configuration of the video tape recorder 20 of the present invention will be described. The video tape recorder 20 includes a supply-side reel stand device 21 and a take-up-side reel stand device 22 which are fitted into reels (not shown) of a video tape cassette (not shown) on which magnetic tapes are wound. And are provided. Reel stand device 22
However, when it is driven to rotate clockwise in FIG. 1, the video tape recorder 20 is in a so-called reproduction state or fast-forward state, and when the reel base device 21 is driven to rotate counterclockwise in FIG. Is a so-called rewind state. The operation of the reel base devices 21 and 22 is switched by the idler mechanism 23.

Further, when the magnetic tape cassette is mounted on the reel stand devices 21 and 22, the magnetic tape is pulled out and wound around the rotary cylinder 24, or the magnetic pole in the wound state is stored in the magnetic tape cassette. 26 are erected on pole bases 27 and 28, respectively. The pole bases 27 and 28 correspond to the angular displacement of the loading gear 29 in the arrow B1 direction or the arrow B2 direction and correspond to the video tape recorder 20.
Inside the guide grooves 31, 32 provided in the chassis 30 in the direction of arrow B3 or the direction of arrow B4, respectively. Pole base
When 27 and 28 are displaced in the direction of arrow B3, the video tape recorder 20 is in a loading state and the magnetic tape is wound around the rotary cylinder 24. Also, the pole bases 27 and 28 are arrow B
When displaced in four directions, the magnetic tape is stored in the magnetic tape cassette and is in the so-called unloading state.

In the guide grooves 31 and 32, stoppers 33 and 34 are provided at the end positions in the arrow B3 direction, respectively.
Arrows B, along with displacement in the B3 direction, loading poles 25,2
6 comes into contact and is stopped, and loading pole 2
Holds the magnetic tape between 5, 26 so that it can run smoothly.

On the rear side of the video tape recorder 20, the idler mechanism 23
A traveling drive motor 36 for transmitting power by a belt 35 to rotate the belt 35 is provided. Further, a gear-shaped loading cam member 37 having teeth formed on the radially outer surface is provided to be rotationally driven by a configuration (not shown), and a swinging member 38 interlocking with the loading cam member 37 is provided by a configuration described later. The above-described loading gear 29 that is provided and meshes with the swing member 38 is provided.

FIG. 3 is a plan view showing the construction of the torque switching device 39 of the embodiment of the present invention including the loading cam member 37 in the video tape recorder 20 having the above construction.
The configuration of the torque switching device 39 will be described with reference to FIG. The torque switching device 39 includes the above-described gear-shaped loading cam member 37, and the loading cam member 37 is rotationally driven around the axis of the pivot 40 in the arrow C1 direction or the arrow C2 direction by a configuration not shown. It A substantially spiral cam groove 41 is formed in the loading cam member 37, and the swinging member 38 provided with a guide pin 42 that is a follower that slides in the cam groove 41 is projected.
It is provided so as to be angularly displaceable around the axis of the pivot 43 in the arrow C3 direction or the arrow C4 direction. Teeth 44 are formed on the swing member 38 over a predetermined circumferential length, and the loading gear 29 meshes with the teeth 44. This loading gear 29 is
Arrow B1 direction or arrow around 45 axis as described above
It is configured to be rotatable in the B2 direction.

A drive lever 48 is provided in the vicinity of the swinging member 38 so as to be angularly displaceable in the arrow C5 direction or the arrow C6 direction around the axis of the pivot shaft 47. The drive lever 48 is configured to be bent in a dogleg shape, and the side facing the swinging member 38 with respect to the pivot 47 is
A driving piece 46, which is the connecting portion 50 and extends from the swinging member 38 in the direction of the driving lever 48, is provided with an abutting piece 49 capable of abutting from the clockwise direction in FIG. The remaining portion of the drive lever 48 is a drive unit 52 that drives a torque generating mechanism 51 having a configuration described below.

The connecting portion 50 of the drive lever 48 is spring-biased in the arrow C5 direction by the spring 53, and the drive portion 52 contacts the stopper 54 to prevent the displacement in the arrow C5 direction.

FIG. 4 is a diagram showing the principle of the torque generating mechanism 51 described above. The torque generating mechanism 51 has, for example, a belt or the like to transmit a rotational motion, and an input side pulley 55 to which torque is input, and a belt or the like corresponding to the input side pulley 55 to rotate the rotational motion. And the output side pulley 56 that outputs the torque. The output pulley 56 is rotatably supported by the shaft 30 on the chassis 30 or the like. The output pulley 56 of the input pulley 55
A friction material 58 such as felt is provided on the surface facing the input side pulley 55, and the input side pulley 55 is spring-biased toward the output side pulley 56 by a spring 59, for example.

The input-side pulley 55 and the output-side pulley 56 have through holes 55a and 56a, respectively, and locking means 60, such as a substantially U-shaped rod, for connecting the through holes 55a and 56a is provided. The engagement means 60 penetrates the through holes 55a and 56a, whereby the input side and output side pulleys 55 and 56 can be engaged / disengaged. That is, this locking means 60 moves toward the arrow D2 in the figure, and the leg portion 60a of the locking means 60 is moved.
When the input side pulley 55 is brought into pressure contact with the output side pulley 56 by the spring force of the spring 59 when the input side pulley 55 is engaged with the through hole 55a of the input side pulley 55, the locking means 60
Thus, the input side pulley 55 and the output side pulley 56 are prevented from being angularly displaced from each other, so that the torque applied to the input side pulley 55 can be output from the output side pulley 56 without being converted.

On the other hand, when the locking means 60 moves toward the arrow D1 in the figure and the leg portion 60a of the locking means 60 separates from the through hole 55a of the input side pulley 55, the locking means 60 is released and Both pulleys
55 and 56 change into a state in which they are in frictional contact with each other via the friction material 58. At this time, the rotational torque applied to the input side pulley 55 is attenuated and output from the output side pulley 56. In this way, the torque generating mechanism 51 is provided with the locking means 60
By inserting / removing the input side pulley 55 into / from the input side pulley 55, it is possible to generate rotational torques of, for example, two kinds of strengths different from each other.

Insertion of the locking means 60 with respect to the input side pulley 55
The drive unit 52 of the drive lever 48 realizes the separation displacement. That is, due to the displacement of the drive unit 52 in the arrow C5 direction, the locking means 60 is separated from the input side pulley 55, and as described above, frictionally contacts via the friction material 58, and thus a damped torque is output. . Further, due to the angular displacement of the drive portion 52 in the direction of arrow C6, the locking means 60 engages with the input side pulley 55, and outputs the undamped torque as described above.

A torque switching operation in the video tape recorder 20 having the above-mentioned configuration will be described. When a magnetic tape (not shown) is wound around the rotary cylinder 24 in the video tape recorder 20 to be in a loading state, the loading cam member 37 is rotated in the arrow C1 direction, and thus slidably contacts the cam groove 41. The guide pin 42 is a pivot
It is displaced radially outward with respect to the axis of 40, that is, the rocking member 38 is angularly displaced about the axis of the pivot 43 in the direction of arrow C3. Due to this angular displacement, the loading gear 29 rotates in the arrow B1 direction, and as described with reference to FIG. 1, the pole bases 27 and 28 are displaced in the arrow B3 direction, and the loading poles 25 and 26 become magnetic. Load the tape. Therefore, for example, an operation such as reproduction of a signal recorded on the magnetic tape can be performed.

At this time, with the displacement of the swinging member 38 in the direction of arrow C3, the drive piece 46 separates from the contact piece 49 of the drive lever 48, so that the drive lever 48 is pivoted by the spring force of the spring 53.
It displaces in the direction of arrow C5 around the axis of and stops in a state of contacting the stopper 54. Therefore, as described above, the torque generating mechanism 51 described with reference to FIG.
It outputs torque that is more damped than the rotational torque given to 55.

On the other hand, when the magnetic tape is released from the loading state and the magnetic tape is stored in the magnetic tape cassette and the so-called fast-forward / rewind operation of the magnetic tape is to be performed, the loading cam member 37 is set in the arrow C2 direction. Is driven to rotate. At this time, the guide pin 42 is displaced inward in the radial direction of the cam member 37 along the cam groove 41, so that the swinging member 38 is angularly displaced about the axis of the pivot 43 in the arrow C4 direction. This angular displacement causes loading gear 29 to move to arrow B2.
Direction, the rotation causes the pole bases 27, 28 to displace in the arrow B4 direction to release the winding state of the magnetic tape around the rotary cylinder 24, as described with reference to FIG.
Store in a magnetic tape cassette.

At this time, the swinging member 38 is angularly displaced in the direction of arrow C4, so that the driving piece 46 abuts the abutting piece 49 to further press the abutting piece 49,
The drive lever 48 is angularly displaced in the direction of arrow C6 against the spring force of the spring 53. Due to this angular displacement, as described above, the fourth
The torque generation mechanism 51 shown in the figure outputs the torque applied to the input side pulley 55 in a state where the torque is not attenuated.

As described above, according to this embodiment, the torque switching operation can be performed without using the conventional torque switching cam member (see FIG. 6) described with reference to FIG. Therefore, the structure can be remarkably simplified.

The cam groove 41 formed in the cam member 37 is formed substantially spirally around the pivot 40 as described above. The pivot 43 of the rocking member 38 is provided at a position farther from the pivot 40 than the cam groove 41, and is provided obliquely downward to the left with respect to the pivot 40 in FIG. The spring 53 applies a spring force so that the contact piece 49 of the drive lever 48 is separated from the drive piece 46.

Effect According to the present invention, the follower 42 of the rocking member 38 is slidably displaced to the cam member 37 having the cam groove 41 formed in a substantially spiral shape, and the rocking member 38 is angularly displaced. The piece 46 contacts the contact piece 49 of the drive lever 48 to angularly displace the drive lever 48 against the spring force of the spring 53, and the contact piece 49 causes the drive piece 46 to move.
The contact piece 49 is separated from the drive piece 46 by the action of the spring 53 when it is not in contact with the drive piece 46. Due to the angular displacement of the drive lever 48 as described above, the torque generating means 51 outputs low torque and high torque. Different types of torque are generated. Cam member 37
Is rotationally driven in the first direction C1 and the opposite second direction C2 for loading and unloading the magnetic tape as described above, whereby the swing member 38 is swung, and the swing member 38 is swung. Means 25 for loading and unloading magnetic tape on the teeth 44 formed on
The loading gear 29 of 28 meshes with each other, and when the rocking member is rotationally driven in the first direction C1 and a torque is generated by the torque generating means 51 during loading, the magnetic tape is run, and Second swing member 38
When unloading is performed in the rotational drive in the direction C2, a high torque can be generated to drive the magnetic tape. Therefore, the torque switching cam member 10 in the prior art described with reference to FIG. 6 can be omitted, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 shows a video tape recorder according to an embodiment of the present invention.
20 simplified plan views, Figure 2 is a videotape recorder
FIG. 20 is a bottom view of FIG. 20, FIG. 3 is a plan view of a torque switching device 39 according to one embodiment of the present invention, FIG. 4 is a diagram showing the principle of the torque generating mechanism 51, and FIG. FIG. 6 is a diagram showing the configuration of a conventional torque switching device 1. 25,26 …… loading pole, 27,28 …… pole base, 29 …… loading gear, 37 …… loading cam member, 38 …… oscillating member, 39 …… torque switching device, 41
…… Cam groove, 42 …… Guide pin, 48 …… Drive lever, 51…
... Torque generator

Claims (1)

[Scope of utility model registration request] 1. A second rotational drive in a first direction (C1) about a first axis (40) for loading a magnetic tape, and a second direction opposite to the first direction (C1) for unloading.
A cam member (37) having a cam groove (41) formed in a substantially spiral shape about the first shaft (40) and driven to rotate in the direction (C2); and a follower (a) sliding in the cam groove (41). 42), which is angularly displaceable around the second shaft (43) provided farther from the first shaft (40) than the cam groove (41) and has teeth (44) in the circumferential direction. The swing member (38) is formed, and the loading gear (29) meshes with the teeth (44) of the swing member (38). The swing member (38) is driven by the rotation of the cam member (37). Means for loading and unloading magnetic tape by angular displacement (25)-(28)
A drive piece (46) protruding from the swing member (38), and a third direction (C5) and a third direction (C5) around the third shaft (47) near the swing member (38). 4th direction (C
6) A drive lever (48) that is angularly displaced, a spring (53) that applies a spring force around the third shaft (47) to the drive lever (48), and a follower (42) that is projectingly provided on the drive lever (48). ) Is slidably displaced in the cam groove (41) and is located at either one of the outer side and the inner side of the cam member (37) in the radial direction, it abuts the drive piece (46) and the drive lever (48). Includes a contact piece (49) that is angularly displaced against the spring force of the spring (53), and in the spring (53), the follower (42) is slidably displaced in the cam groove (41). When the contact piece (49) is located at the other of the radially outer and inner positions of (37), the contact piece (49) moves toward the drive piece (4).
The spring force is applied so as to separate the cam member (3) from the cam member (3) in response to the angular displacement state of the drive lever (48).
Drive lever (4) driven by rotation in the first direction (C1) of 7)
By the angular displacement in the third direction (C5) of 8), a low torque is generated to run the magnetic tape, and the fourth rotation of the drive lever (48) is performed by the rotational driving of the cam member (37) in the second direction (C2). A magnetic tape recording or reproducing apparatus comprising: a torque generating means (51) for generating a high torque by an angular displacement in a direction (C6) to run the magnetic tape.