JPH0766602B2 - Magnetic recording / reproducing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic recording / reproducing apparatus represented by a cassette video tape recorder.

[Outline of Invention]

According to the present invention, a magnetic tape wound and housed between a supply reel and a take-up reel of a cassette is opened and closed so that the magnetic tape is brought into contact with the outer circumference of a rotary head cylinder to perform recording / reproduction. In the magnetic recording / reproducing apparatus, the horizontal head substrate on which the rotary head cylinder is tilted at a predetermined angle is mounted, and the cassette substrate on which the cassette is mounted is provided, and the rotary head cylinder mounted on the substrate. And the cassette mounted on the cassette substrate is capable of approaching and separating, and the rotary head cylinder has a fixed cylinder at an upper portion and a rotary cylinder at a lower portion of the fixed cylinder, and at the upper portion of the fixed cylinder, When the rotary head cylinder and the cassette are in close proximity to each other, the tip of the cassette and the re-opened state of the cassette are opened. A notch having a horizontal bottom wall and vertical side walls to fit the distal end of the cassette to de is inserted deeply and shape of the lid magnetic recording and reproducing apparatus, characterized in that formed on the cassette side.

[Conventional technology]

In a video cassette or the like, in order to protect the magnetic tape housed inside, the lid is normally closed so that the magnetic tape is not exposed to the outside. Therefore, in a cassette video tape recorder or the like, a so-called cassette loading operation of moving the cassette between the mounting position and the playing position and opening the lid therebetween, a state where the magnetic tape is housed in the cassette, and a rotary head are mounted. A so-called tape loading operation of moving between the state of being wound around the outer circumference of the rotating head cylinder being performed is required. In order to realize such cassette loading and tape loading, various devices have been proposed in the past.

[Problems to be solved by the invention]

However, in all the conventional devices, the cassette and the rotary head cylinder are separated from each other by a considerable distance, so that the device cannot be downsized, and it is applied to a so-called 8mm video tape recorder, which is characterized by its small size. It was difficult to do.

[Means for solving problems]

Each of the figures shows the configuration of the magnetic recording / reproducing apparatus of the present invention. As shown in FIGS. 12 and 13, a rotary head cylinder 2 to which a rotary head is mounted is attached to the substrate 1. Reference numeral 3 denotes a cassette substrate on which a cassette is mounted, which has a plurality of pins that fit into a plurality of elongated holes formed in the substrate 1 (none of which are shown), and is movable relative to the substrate 1. Has become. Reference numeral 4 is a capstan attached to the substrate 1. Reference numerals 5 and 6 denote guide plates fixed to the substrate 1 substantially symmetrically around the outer circumference of the rotary head cylinder 2, and have guide grooves 7 and 8, respectively. Numerals 9 and 10 are movable bases, which are guided by the guide grooves 7 and 8 of the guide plates 5 and 6, respectively, and are movable around the outer circumference of the rotary head cylinder 2. Since the rotary head cylinder 2 is provided so as to be inclined at a predetermined angle with respect to the horizontal substrate 1, the guide plates 5 and 6 are provided substantially parallel to the substrate 1 (of course, it is also possible to reverse them). Is). The movable bases 9 and 10 have rotating guide rollers 11 and 12, respectively, and guide poles 13 and 14 inclined at a predetermined angle. Relative movement between the substrate 1 and the cassette substrate 3 is transmitted to the moving tables 9 and 10 by a link (not shown). 15 and 16 are reel stands for winding and supplying, which are provided on the cassette substrate 3. Reference numeral 31 is an arm, which is rotatably supported by a fulcrum 32 of the cassette substrate 3, and has a pinch roller 33 and a guide 34 for drawing out the magnetic tape. Reference numeral 35 denotes an arm rotatably supported about a fulcrum 36 of the cassette substrate 3, and has a guide 37 for drawing out the magnetic tape. The arms 31 and 35 are rotated by the relative movement of the substrate 1 and the cassette substrate 3 by a cam mechanism (not shown).

Reference numeral 20 denotes a motor fixed to the substrate 1, which transmits rotation via a belt 21 to a flywheel 22 to which the capstan 4 is coupled. Reference numeral 23 is a pulley that gives tension to the belt 21. A gear 24 is connected to the capstan 4 and is connected to the gear 25. Reference numerals 26 and 27 denote gears supported by the cassette substrate 3 that mesh with each other. 28 is a pulley coaxially coupled to the gear 27, 29 is a pulley coaxially coupled to the reel base 15 of the take-up reel, and 30 is a belt for transmitting rotation between the pulleys 28 and 29. The pulley 29 is urged in the axial direction of the reel base 15 by a spring, and both are pressed against each other via felt (neither is shown). The pin 39, which coaxially connects the gear 27 and the pulley 28, also functions as a reference pin for positioning the cassette at a predetermined position.

On the other hand, as shown in FIGS. 1 to 7, the rotary head cylinder 2 includes an upper cylinder 41 and a lower cylinder as fixed cylinders.
The rotary head 44 is exposed from the space 43 between the spaces 42, so-called 2
It is a peace type. The rotary head cylinder 2 may be of a so-called three-piece type in which the upper and lower parts are fixed cylinders and the middle part thereof is a rotary cylinder to which a rotary head is mounted. Reference numeral 45 denotes a connecting member that connects the upper cylinder 41 and the lower cylinder 42 vertically. The surface of the connecting member 45 that contacts the cylinders 41, 42 is
Cylinders 41 and 42 are formed with the same curvature as 1 and 42.
By abutting on the surface, the centers of rotation of the cylinders 41, 42 are made to coincide with each other. Reference numeral 46 denotes a plate fixed to the connecting member 45, and by contacting the upper end surface of the upper cylinder 41, the position of the plate in the thrust direction is regulated. 47 is a connecting member 45 (or plate 46)
A support member made of metal or the like fixed to the cylinder
A notch 48 is formed at a position substantially corresponding to the center of rotation of 41. A pressing member 49 is fixed to the substrate 1, and a screw 51 is screwed into a position corresponding to the cutout portion 48 of the supporting member 47. The tip of the screw 51 is in contact with the cutout 48. Therefore, on the base 40 that is fixed to the substrate 1 at a predetermined angle,
The assembly of the cylinders 41, 42 is pressed and fixed. Although it is possible to directly press the upper cylinder 41, the positions of the upper cylinder 41 and the lower cylinder 42 are slightly deviated, which makes it difficult to accurately run the magnetic tape. Therefore, it is preferable to extend the connecting member 45 to the vicinity of the rotation centers of the cylinders 41 and 42 (providing the support member 47) and press the vicinity of the rotation centers with the screw 51 as in the embodiment. On the other hand, at least two holes 52 (only one is shown for convenience in FIG. 6) are formed on the lower surface of the lower cylinder 42, and are spaced apart by approximately 180 degrees, and the pins 53 corresponding to the holes 52 are formed. Is fixed to the base 40 by press fitting or the like. By fitting the pin 53 into the hole 52, movement of the cylinders 42, 41 in the direction perpendicular to the rotation axis is prevented. Although it is possible to fix the lower cylinder 42 to the base 40 by inserting a screw from below the base 40, it is necessary to enlarge the base 40 by the amount of inserting the screw, so it is necessary to reduce the size. The pin 53 and the hole 52 are preferably formed as in the example (the positions may be opposite to each other). Reference numerals 61 and 62 are notches formed in the upper portion of the inclined upper cylinder 41. The notches 61, 62 are located on the cassette 19 side, and the projection 94 of the cassette 19 and the lid 92 in the open state are fitted deeply into the cassette 19 and the horizontal bottom wall according to the shapes of the lid 92. It has various side walls (see FIGS. 1 to 4).

As shown in FIGS. 8 to 13, the cassette substrate 3 has a long hole.
A fixed plate 71 having 72 is fixed. A moving plate 73 has a pin 74 fitted in the long hole 72 and is vertically movable. 75 is a spring,
The moving plate 73 is biased upward with respect to the fixed plate 71. A lever 76 is rotatably supported by a fulcrum 77 of the moving plate 73, and has a release member 78 at one end and an opening member 79 at the other end. Reference numeral 80 is a pin implanted in the center of the opening member 79. Reference numeral 81 is a guide plate having an inclined portion 82, a horizontal portion 83, and a vertical portion 86, which is fixed to the fixed plate 71. The inclined portion 82 is formed substantially corresponding to the locus when the pin 80 rotates about the fulcrum 77. Reference numeral 84 is a spring, which biases the lever 76 in the counterclockwise direction in FIG. Lever 76 is always stopper 85
Has stopped at the position where it abuts against.

[Action]

Then, the operation will be explained. As shown in FIG. 12, the cassette 19 is mounted on the cassette substrate 3 while the cassette substrate 3 is separated from the rotary head cylinder 2. In the state before such loading is started, the guide
The magnetic tape 18 (lid 92 of the cassette 19) is provided between the rotary head cylinder 2 and the rotary rollers 34, 37, the pinch rollers 33, the guide rollers 11, 12, the guide poles 13, 14 and the like.
Is designed to be located. When mounting the cassette 19, the cassette 19 is manually or automatically lowered vertically from the position relative to the cassette substrate 3.

When the cassette 19 is lowered, the release member 78 comes into contact with the release pin 91 that releases the lid lock of the cassette 19. When the cassette 19 is further lowered, the lever 76 rotates about the fulcrum 77 in the clockwise direction in FIGS. 9 to 11, and the release member 78 causes the release pin 91 to move to the spring housed in the cassette 19. It is pressed and moved backward (to the right) against the urging force (not shown). As a result, the lids 92 and 93 are unlocked. When the lever 76 rotates clockwise,
The opening member 79 moves upward and contacts the lower surface of the lid 92,
Push up. Therefore, the lid 92 is opened upward around the fulcrum 97. At this time, the inner lid 93 is the lid 92
Since it is rotatably connected to the fulcrum 98, the protrusion 96 formed on the inner lid 93 is released by being guided by the cam groove 95 formed on the inner surface of the cassette 19 while being moved upward at the same time. It Since the spring 75 has a stronger urging force than the spring urging the lid 92, the moving plate 73 is not moved downward until the lid 92 is opened. Therefore, the lid 92 (93) is attached to the guides 34, 3
7, the pinch roller 33, the guide rollers 11, 12, the guide poles 13, 14 and the like are opened when the position is above. In order to make this more certain, when the cassette 19 is lowered, the pin 80 comes into contact with the horizontal portion 83 of the guide plate 81. That is, when the pin 80 abuts the horizontal portion 83, the horizontal portion 83 causes the lid 80 to pass through the pin 80 and the opening member 79.
Since the pressure is applied to the lid 92, a strong force acts on the lid 92 and the lid 92 is surely opened. Then, when the cassette 19 is further lowered, the lever 76 is further rotated clockwise, and the pin
80 is guided from the horizontal part 83 to the inclined part 82, and finally the inclined part
As it is separated from 82 and guided by the vertical part 86, the cassette
19 is allowed to fall further.

When the cassette 19 is further lowered after the lid 92 is opened, the spring 75 extends. When the cassette 19 is clamped by the clamper 99 against the biasing force of the spring 75, the cassette 19 can be held on the cassette substrate 3 with the lids 92 and 93 opened (FIG. 11). In this state, the magnetic tape 18 has a predetermined height with respect to the guides 34 and 37, the pinch roller 33, the guide rollers 11 and 12, the guide poles 13 and 14, and can be pulled out by these.

Then, a motor (not shown) is driven or the cassette substrate 3 or the substrate 1 is moved relative to the other by manual operation (for example, the cassette substrate 3 is moved upward in FIG. 12). At this time, the arm 31 rotates clockwise by the cam mechanism. As a result, the magnetic tape 18
Is withdrawn from the cassette 19. Similarly, as the cassette substrate 3 moves, the arm 35 rotates counterclockwise,
The magnetic tape 18 is pulled out from the cassette 19. At this time, gears 25 and 26 are not yet connected. Thus, the magnetic tape 18 can be drawn from the supply reel or the take-up reel or both.

For example, if you pull out the magnetic tape 18 from the supply reel,
The reel base 15 is braked by means not shown.

On the other hand, when the cassette substrate 3 is further moved upward, the link mechanism presses the movable bases 9 and 10 upward, respectively, and the movable base 9,
10 is guided by the guide plates 5 and 6 and moves upward. As a result, as shown in FIG. 13, the magnetic tape 18 is wound around the rotary head cylinder 2 substantially symmetrically by the guide rollers 11 and 12 and the guide poles 13 and 14 provided on the moving bases 9 and 10 (of course). The position of the movable bases 9 and 10 (that is, the guide plates 5 and 6)
(The position of) can be wound asymmetrically by selecting the right position). When the cassette substrate 3 moves the cassette 19 to this playing position, the arm 31 pivots largely clockwise, so that the pinch roller 33 presses the magnetic tape 18 against the capstan 4.

On the other hand, when the cassette substrate 3 advances to a predetermined position with respect to the substrate 1, the gear 26 engages with the gear 25. Therefore, the motor 20,
The capstan 4 is rotated via the belt 21 and the flywheel 22, the magnetic tape 18 is run, and the capstan 4 rotates, so that the gears 24 and 25 rotate together. This rotation is transmitted to the gears 26, 27, the pulley 28, the belt 30,
It is transmitted to the reel stand 15 of the take-up reel via the pulley 29. Therefore, the magnetic tape 18 can be taken up by the take-up reel. The brake applied to the take-up reel stand 15 is released as necessary (in the case of a so-called soft brake, the brake may be forcibly prevented from being released).

By the way, when the cassette substrate 3 is moved forward with respect to the substrate 1 to a predetermined playing position, the cassette 19 and the rotary head cylinder 2 are arranged as shown in FIG. That is, the tip projection 94 of the cassette 19 is the cutout 61 of the upper cylinder 41.
The lids 92 and 93 are also inserted into the notches 62. As a result, it becomes possible to dispose the cassette 19 extremely close to the rotary head cylinder 2 (the extension line of the tip of the cassette 19 has already crossed the diameter of the rotary head cylinder 2). Since the upper cylinder 41 does not rotate, the lids 92, 93, the protrusion 94, etc.
Even if each of the 61 touches slightly, there is no problem.

Next, the unloading operation will be described. At the time of unloading, the cassette substrate 3 is moved with respect to the substrate 1 in the direction opposite to that at the time of loading. Therefore, the gears 25 and 26 are separated from each other, the drive source of the reel base 15 is lost, and the supply reel is not rotated thereafter.

On the other hand, when the cassette substrate 3 retreats with respect to the substrate 1, the reel base 15 or 16 is rotated by utilizing the relative movement thereof.
Further, as the cassette substrate 3 retreats, the moving bases 9, 10, the arms 31, 35, etc. move to their original state. This results in a cassette
The magnetic tape 18 is also returned (wound) to the supply reel or the take-up reel while the 19 is returned to the mounting position.

Further, if the clamp by the clamper 99 is manually or automatically released and the cassette 19 is moved upward, the cassette 19 can be detached from the cassette substrate 3 by the operation reverse to that described above, and a spring is attached. The lids 92 and 93 are closed by the power.

The relative motion between the substrate 1 and the cassette substrate 3 may be rotational motion or a combination thereof, instead of the linear motion as described above. Further, it is obvious that the gears 24, 25, 26 and 27 may be rotating means that rotate by friction such as an idler. It is also possible to omit the gears 25 and 26 and directly mesh the gears 24 and 27. However, in this case, since the gears 24 and 27 are meshed with each other, it is necessary to increase the diameter thereof, which occupies a large space. Therefore, it is preferable to dispose a plurality of gears having a relatively small diameter as in the embodiment.

〔effect〕

As described above, according to the present invention, the magnetic tape which is wound and accommodated between the supply reel and the take-up reel of the cassette is pulled out by opening the lid which is normally closed, and is drawn to the outer circumference of the rotary head cylinder. In a magnetic recording / reproducing apparatus for loading, a horizontal substrate on which the rotary head cylinder is inclined and attached at a predetermined angle and a cassette substrate on which the cassette is mounted and which is movable relative to the substrate are provided. The rotary head cylinder has a fixed cylinder at an upper portion and a rotary cylinder at a lower portion, and the cassette and the lid are opened so that the cassette and the opened lid can be deeply fitted into the upper portion of the inclined fixed cylinder. A notch portion having a horizontal bottom wall and a vertical side wall is formed on the cassette side according to the shape of the lid, and the cassette substrate When the cassette was moved from the attachment / detachment position to the playing position in a direction substantially parallel to the surface of the substrate, the opened lid of the cassette mounted on the substrate was inserted into the notch. Therefore, the cassette can be placed close to the rotary head cylinder in the horizontal direction in which the cassette substrate moves and in the direction perpendicular to the horizontal direction. Further, since the cassette loads in the horizontal direction, the outer circumference of the rotary drum is set in the cassette half. The magnetic head can be inserted, and the size of the device in the horizontal direction and the vertical direction can be reduced to realize the miniaturization of the entire device.

[Brief description of drawings]

Each of the drawings relates to the present invention, FIG. 1 is a schematic side view of a cassette and a rotary head cylinder, FIG. 2 is a plan view of an upper cylinder, FIG. 3 is its side view, and FIG. 4 is its perspective view. Fifth
The figure is a plan view showing the mounting state of the rotary head cylinder,
FIG. 6 is a side view thereof, FIG. 7 is a sectional view thereof, FIG. 8 is a plan view of a lid lock releasing portion, FIGS. 9 to 11 are side views thereof, and FIG. 12 is a plan view at the time of starting loading. , FIG. 13 is a plan view at the time of completion of loading. 1 ... Substrate, 2 ... Rotating head cylinder 3 ... Cassette substrate 4 ... Capstan 5,6 ... Guide plate, 9,10 ... Movement stand 15,16 ... Reel stand 18 ... Magnetic tape, 19 …… Cassette 20 …… Motor 21,30 …… Belt 22 …… Flywheel 23,28,29 …… Pulley 24,25,26,27 …… Gear 31,35 …… Arm 33 …… Pinch rollers 34,37 ...... Guide 41 …… Upper cylinder, 42 …… Lower cylinder 45 …… Coupling member, 47 …… Support member 48 …… Notch, 49 …… Pressing member 52 …… Hole, 53 …… Pins 61, 62 …… Notch 92 …… Lid, 93 …… Inner lid 94 …… Protrusion, 95 …… Groove cam

Claims (1)

[Claims] 1. A magnetic tape wound and stored between a supply reel and a take-up reel of a cassette is recorded by opening a lid that is normally closed and contacting the outer circumference of a rotary head cylinder. In a magnetic recording / reproducing apparatus for reproducing, a horizontal substrate on which the rotary head cylinder is inclined and attached at a predetermined angle, and a cassette substrate on which the cassette is mounted are provided, and the rotary head attached to the substrate. The cylinder and the cassette mounted on the cassette substrate can be brought close to and separated from each other, and the rotary head cylinder has a fixed cylinder at an upper portion and a rotary cylinder at a lower portion of the fixed cylinder,
The top end of the cassette and the lid are shaped so that the top end of the cassette and the open lid are deeply inserted into the fixed cylinder above the rotary head cylinder and the cassette. A magnetic recording / reproducing apparatus characterized in that a notch portion having a horizontal bottom wall and a vertical side wall is formed on the side of the cassette in accordance with the above.