JPH0534743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette mounting device, and more particularly to a tape cassette mounting device configured to stably hold a mounted tape cassette.

Prior Art As a conventional tape cassette loading device for a VTR, for example, the Japanese Patent Publication No. 53-1980 proposed by the applicant of the present invention is an example.
There is a device disclosed in Publication No. 34884. In the device of this publication,
The reel pressing member is configured to be rotationally biased by the elastic force of a torsion spring or the like to press the reel toward the reel stand.

Problems to be Solved by the Invention However, in the conventional apparatus described above, since the pressure of the reel against the reel stand becomes a rotational load on the reel, the elastic force of the spring is determined to an extent that does not hinder tape running. However, when a large impact force is applied to the above device, the spring is elastically displaced and moves up and down, which disturbs the tape running position, causing unstable tape running and adversely affecting recording and playback. There are challenges.

In view of the above problems, the present invention provides a tape having a structure in which a reel pressing member is engaged with an engaging surface to mechanically hold the reel, and a tape cassette can be attached with the reel fixedly supported on the reel shaft. The object of the present invention is to provide a cassette loading device.

Means for Solving the Problems The present invention provides a method for installing and removing a tape cassette containing a reel wound with a magnetic tape, and a loading position for loading the magnetic tape in a magnetic recording/reproducing device. a cassette holder which is movably provided to store the tape cassette; and a cassette holder which is rotatably provided to extend in the upper part of the cassette holder in the lateral direction, and presses the reel in the loading position and presses the reel in the loading/unloading position. a reel pressing member having a pressing part for releasing the reel at one end and an engaging part projecting to the side of the cassette holder at the other end; a cam member that is rotatably provided along a side surface of the cassette holder and has a cam surface that slides into contact with the engaging portion of the reel pressing member during the process of the cassette holder moving from the loading/unloading position to the loading position; a spring member that urges the member to rotate; and a cam member regulating means that rotates the cam member against the tensile force of the spring member while the cassette holder moves from the loading/unloading position to the loading position. The cam surface of the cam member is formed such that the distance from the cam surface to the shaft increases as the distance from the cam surface to the shaft increases in the direction of rotation by the spring member, and The spring member is provided so as to be substantially perpendicular to the direction of the force that attempts to lift the engaging portion of the member, the line of action of the force that attempts to lift the member passes near the axis, and the direction in which the spring member is biased is The engaging portion of the reel pressing member is displaced in the reel pressing direction as the reel pressing member rotates.

Effects The present invention is such that the cam surface of the cam member is formed such that the distance from the cam surface to the shaft increases as the distance from the cam surface to the shaft increases in the direction in which the spring member is intended to rotate.
In addition, the cam surface is provided so as to be substantially perpendicular to the direction of the force that attempts to lift the engaging portion of the reel pressing member, and the line of action of the force that attempts to lift the engaging part of the reel pressing member is formed so that it passes near the shaft. As the cam member rotates in the biasing direction of the spring member, the engaging portion of the reel pressing member can be displaced in the reel pressing direction, and even if the reel position changes or the dimensions of the reel pressing member and the cam member change. Even if there is variation, the cam surface can push up the engaging portion by rotating the cam member, and the reel pressing member can hold the reel with a constant pressing force, making it possible to stabilize the rotation of the reel.

Embodiment FIGS. 1 and 2 show an embodiment of the tape cassette mounting device according to the present invention.

In FIG. 1, in a magnetic recording/reproducing apparatus 1, a tape cassette loading device 2 stores a tape cassette 3 in a cassette holder 4, and places the tape cassette loading/unloading position (indicated by a dashed line) and tape loading position (indicated by a solid line). This device moves the cassette 3 up and down between the positions shown. The holder 4 of this device 2 has a box shape that can store the cassette 3 in a horizontal state,
It is provided so that the cassette 3 can be moved up and down while maintaining its horizontal state.

The cassette 3 has a supply reel 3a and a take-up reel 3b.
A magnetic tape 3f is wound around reels 3a and 3b. The reels 3a and 3b have a reel stand receiving part 3d so that the reel stand 7 can be inserted from the lower side.
is recessed, and three reel drive holes 3f are bored in the rotation center plane 3e of the reels 3a and 3b. A reel pressing member 5 is rotatably provided on the left and right sides of the inside of the holder 4 near the top plate, and rotatably presses the reels 3a, 3b in the cassette 3 from above.

The reel pressing member 5 extends laterally in the upper part of the inside of the holder 4, has a pressing part 5a projecting at one end that abuts the center of the reels 3a, 3b, and an engaging part projecting laterally to the holder 4 at the other end. 5b.

Further, when the holder 4 is in the attachment/detachment position, the reel pressing member 5 is rotationally biased by the coil spring 6 to a position where it does not interfere with the insertion of the cassette 3. Holder 4
The top plate is a lid 4a that opens and closes the cassette mounting portion 1a. The reel stand 7 is disposed at each position to rotationally drive the reels 3a and 3b in the cassette 3 in the tape loading position, and a drive pin 7a fitted in the reel drive hole 3f projects from the upper part of the reel stand. It has been set up.

As shown in FIG. 2, the holder 4 is supported by support arms 8 on its left and right sides, and the arms 8 are pivotally supported by a fixed shaft 9. As shown in FIG. The arm 8 that supports the left and right side surfaces of the holder 4 has a roller 8b projecting horizontally from a central convex portion 8a. On the other hand, a support plate 10 is fixed to the left side surface of the holder 4 so as to protrude downward from the bottom surface of the holder.

On the bottom plate 11 of the cassette mounting portion 1a, a support plate 13 is provided on the right side and a support plate 12 is provided on the left side at a distance slightly wider than the width of the holder 4, and are vertically provided thereon. The support arm 14 is supported at both ends by shafts 10a and 12a, respectively, and is mounted between the support plates 10 and 12, and supports the holder 4 so that it can move up and down while maintaining a horizontal state.

The shafts 15a, 16a of the left and right support plates 12, 13 are connected to a biasing member (cam member) 15 and a locking member 16, respectively.
is supported. One end of the biasing member 15 is a fan-shaped cam surface 15b, and the other end is a convex portion 15c that engages with a pin 16d to lock the biasing member 15.

Further, the biasing member 15 is rotatably supported by a shaft 15a that protrudes to the side of the holder 4 so as to rotate along the side of the holder 4. The cam surface 15b of the biasing member 15 is formed such that the distance from the cam surface 15b to the shaft 15a becomes longer as the direction of rotation is shifted by the coil spring 17, and the cam surface 15b is configured to press the reel. Engagement portion 5b of member 5
It is installed so that it is approximately perpendicular to the direction of the force that is trying to lift it. Further, the cam surface 15b is formed so that the line of action of the force for lifting passes near the shaft 15a, and as the cam surface 15b rotates in the urging direction of the coil spring 17, the engaging portion 5 of the reel pressing member 5
It is formed in a curved shape so as to displace b in the reel pressing direction.

Further, the coil spring 17 is connected to the shaft 15a and the convex portion 15c.
The biasing member 15 is rotated in the direction of arrow B by being engaged at an intermediate position. The locking member 16 has a slanted cam surface 16b at its tip.
It has a locking groove 16c on the lower side of the roller 8b so that the roller 8b can be fitted therein, and a convex portion 15 is provided at the lower part of the locking groove 16c.
pin 16d that engages with c and locks the biasing member 15;
A coil spring 18 is provided which urges the lock member 16 to rotate in the direction of arrow A.

Note that the pin 16d of the lock member 16 is connected to the holder 4.
The cam member functions as a cam member regulating means that rotates the biasing member 15 clockwise against the pressing force of the spring 17 while the cam member moves from the mounting/dismounting position to the loading position.

Next, the operation of the tape cassette loading device having the above structure will be explained with reference to FIGS. 3 to 5. Here, since this device 2 is bilaterally symmetrical except for the support arm 14, only the mechanism on the right side will be described.

First, when an ejector switch (not shown) is turned on when installing the cassette 3 into the apparatus 1, the holder 4 rises from the mounting portion 1a to the cassette mounting position (the position shown in FIG. 2). At this time, the first
As shown by the dashed line in the figure, the reel pressing member 5 in the holder 4 is biased by a spring 6, and the pressing portion 5a
is raised to a position that does not interfere with insertion of the cassette 3. In this state, the cassette 3 is inserted into the insertion slot 4b.
It is horizontally moved in the _X1 direction and inserted into the holder 4. After inserting the cassette, when the lid 4a is pushed down by the hand in the direction of arrow _Z2 , the cassette 3, together with the holder 4, descends into the mounting section 1a and reaches the tape loading position.

During the process of the cassette 3 being lowered from the cassette loading/unloading position to the tape loading position, the tape cassette loading device 2 operates as described below. As the cassette 3 descends from the cassette loading/unloading position shown in FIG. 2 to the position shown in FIG.
Rotate in the direction.

At this time, the roller 8b of the arm 8 is
The support arm 8 is in contact with the cam surface 16b at the tip of the support arm 8.
At the same time as the lock member 16 is rotated, the lock member 16 is rotated in the direction of arrow B against the spring 18. On the other hand, since the pin 16d is engaged with the protrusion 15c of the biasing member 15,
The biasing member 15 rotates in the direction of arrow A against the spring 17 as the locking member 16 rotates.

Furthermore, as the cassette 3 descends from the position shown in FIG. 3 to the position shown in FIG. rotate it in the direction,
It reaches the entrance of the lock groove 16c. On the other hand, biasing member 1
5 is pushed by the pin 16d and rotates in the direction of arrow A so that the cam surface 15b is in the vertical direction.

Therefore, the cam surface 15b of the biasing member 15 is pressed against the reel pressing member 5 that has descended along with the holder 4.
The engaging portion 5b is received. When the lid 4a is further pushed in the direction of arrow _Z2 , the cassette 3 descends to the tape loading position shown in FIG.

At the same time, as shown in FIG. 1 (solid line part), the engaging part 5b of the reel pressing member 5 of the holder 4 is pushed up relative to the urging member 15, and the pressing part 5a comes into contact with the reels 3a and 3b. It rotates like this. Also,
The position of the lid 4a of the holder 4 is on the top panel 1 of the device 1.
b, and the cassette mounting portion 1a is in a fully closed state.

On the other hand, the locking member 16 is rotated in the direction of arrow A under the action of the tensile force of the spring 18 so that the roller 8a fits into the locking groove 16c, thereby locking the roller 8a in the inner part of the locking groove 16c. That is, the locking member 16 is attached to the holder 4 via the support arm 8.
Movement in the Z ₁ and Z ₂ directions is restricted to hold the cassette 3 at the tape loading position.

Further, due to the rotation of the pin 16d of the lock member 16, the rotation restriction of the biasing member 15 is released, and the spring 17
It is urged to rotate in the direction of arrow B by the action of the tensile force. Therefore, the biasing member 15 is rotationally biased and stopped by the spring 17 so that the cam surface 15b pushes up the engaging portion 5b in the direction of arrow _Z1 , and the reel pressing member 5 moves the reels 3a and 3b in the direction of arrow Z1. Press in _two directions. At this time, the engaging portion 5b moves the cam surface 15b along the arrow Z ₂
The force pushing back in the direction acts toward the center of the shaft 15a, and the shape of the cam surface 15b is a curved shape substantially perpendicular to the direction of force action, so that the biasing member 1
It does not become a force that tries to rotate 5.

On the other hand, the reel stand 7 is relatively fitted into the reel stand receiving part 3d in the cassette 3, and the drive pin 7a on the reel stand 7 is fitted into the reel drive hole 3f, so that the reel 3
a and 3b are placed on the reel stand 7. reel 3
a and 3b are stably held between the reel stand 7 and the reel pressing member 5 at the tape loading position, and are in a tape loading ready state.

Further, the biasing member 15 has a cam surface 15 as an engagement surface.
When the reel pressing member 5 transmits the force to press the reels 3a, 3b of the cassette 3 by pressing the engaging portion 5b of the reel pressing member 5 through the reel b, the acting force becomes irreversible. Even if a large impact force is applied to the device, the reel 3 of the cassette 3
This prevents a and 3b from shaking. As a result, the impact resistance of the device is improved, and the reels 3a, 3b
The magnetic tape wound around the magnetic tape can stably run at a predetermined tape running position, resulting in stable magnetic recording and reproduction.

After recording and playback, turn off the eject switch.
Turn it ON and rotate the left and right lock members 16 in the direction of arrow B. Therefore, the cassette 3 is the holder 4.
At the same time, due to the action of the holder lifting spring (not shown), the cassette is mounted by sequentially moving from the state shown in Fig. 5 to the states shown in Figs. 4, 3, and 2, contrary to the case of mounting the cassette. It reaches the release position and is positioned and stopped by a stopper (not shown).

At this time, the reel pressing member 5 is rotated by the spring 6 to release the reels 3a and 3b, and the tape cassette 3 can be pulled out from the holder 4 in the direction of arrow _X2 .

In this way, the reels 3a and 3b are moved between the reel pressing portion 5a and the reel stand 7 only by the action of the tensile force of the spring 18.
Since the reels 3a and 3b are sandwiched between the reels 3a and 3b, the pressing force of the reels 3a and 3b is small, and the load during tape running can be reduced.Even if a large impact is applied, the biasing member 15 irreversibly presses the reel pressing member 5. ,3b
Regardless of the amount of tape winding, the magnetic tape 3c can run guided by a prescribed running position.

Further, in the above embodiment, the biasing member 15 and the like are provided on both sides of the holder 4, but the take-up reel 3b side is provided with a capstan (not shown) even if the biasing member 15 is not provided.
Since the pinch roller (not shown) pinches and drives the magnetic tape 3c, even if an impact occurs, the magnetic tape 3c
The running of c is relatively stable.

Therefore, even if the biasing member 15 is disposed only on the supply reel 3a side and is pressed on the take-up reel 3b side with a simple structure, tape running is sufficiently stable.

Further, the tape cassette mounting device 2 includes:
It can be applied not only to VTR equipment but also to audio tape cassettes.

Effects of the Invention As described above, in the tape cassette mounting device of the present invention, the cam surface of the cam member is configured such that the distance from the cam surface to the shaft becomes longer as the distance from the cam surface to the shaft changes in the direction of rotation by the spring member. The cam surface is formed so as to be substantially perpendicular to the direction of the force that attempts to lift the engaging portion of the reel pressing member, and the line of action of the force that attempts to lift the engaging part of the reel pressing member is formed such that it passes near the shaft. Therefore, even if the position of the reel changes or there are variations in the dimensions of the reel pressing member and the cam member, the cam surface can push up the engaging part by rotating the cam member, and the reel pressing member holds the reel with a constant pressing force, making it possible to stabilize the rotation of the reel.

In addition, the cam member presses the reel pressing member mechanically and does not press the reel elastically due to the action of the elastic member, so even if a large impact force is applied, the pressing part will not move up and down and the reel will float. First, the vertical movement of the reel is reliably suppressed to keep the tape running stably, without interfering with the recording and reproducing operations of the magnetic recording and reproducing device. In addition, the cam member has a structure in which a spring urges the cam member to rotate around the shaft, and the cam surface presses the engaging portion due to the rotational force of the cam member, causing the reel pressing member to rotate and the pressing portion to press the reel. Therefore, the tensile force of the spring that biases the cam member to rotate can be weakened, reducing the reel pressing force of the pressing part, reducing the burden on the magnetic tape, reel, bearings, etc. when the tape is running, increasing durability. It is advantageous in terms of Furthermore, the cam surface of the cam member is a surface that is substantially orthogonal to the direction of the force that the engaging portion acts on the cam surface, and the direction of force action is near the shaft, so even if the engaging portion presses the cam member, The cam member is not rotated and the force action becomes irreversible, and the reel can be held in response to changes in the acting force due to changes in the amount of tape winding on the reel, and the reel can be held against excessive impact force and vibrations applied from the outside. It has features such as stably holding the reel without any play and maintaining a constant tape running height.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a tape cassette mounting device according to an embodiment of the present invention holding a tape cassette at the tape loading position, and FIG. 2 is a cassette holder with a tape cassette at the cassette loading/unloading position. Figure 3 shows the state in which it is stored inside.
4 and 5 are right side cross-sectional views showing the operation of each member in the process of the tape cassette reaching the tape loading position by lowering the cassette holder. DESCRIPTION OF SYMBOLS 1... Magnetic recording/reproducing device, 2... Tape cassette loading device, 3... Tape cassette, 3a... Supply reel, 3b... Take-up reel, 4... Cassette holder, 5... Reel pressing member, 5b... ...Engaging portion, 6, 17, 18... Coil spring, 7... Reel stand, 8, 14... Support arm, 8b... Roller, 10, 12, 13... Support plate, 15... Biasing member , 16...Lock member, 16c...Lock groove, 16d...Pin.

Claims (1)

[Scope of Claims] 1. A tape cassette containing a reel wound with a magnetic tape is movable between a loading/unloading position where a tape cassette is loaded and unloaded and a loading position where the magnetic tape is loaded in a magnetic recording/reproducing device. A cassette holder is provided for storing the tape cassette, and the cassette holder is rotatably provided to extend laterally in the upper part of the cassette holder, and presses the reel in the loading position and releases the reel in the loading/unloading position. a reel pressing member having a pressing portion at one end and an engaging portion projecting to the side of the cassette holder at the other end; a cam member that is rotatable along the cassette holder and has a cam surface that slides into contact with the engaging portion of the reel pressing member during the movement of the cassette holder from the loading/unloading position to the loading position; The cam comprises a spring member that biases the cassette holder, and a cam member regulating means that rotates the cam member against the tensile force of the spring member while the cassette holder moves from the loading/unloading position to the loading position. The cam surface of the member is formed such that the distance from the cam surface to the shaft becomes longer as the distance from the cam surface to the shaft increases in the direction of rotation by the spring member, and the cam surface is formed so that the distance between the cam surface and the shaft increases as the distance from the cam surface increases in the direction in which the spring member attempts to rotate the member. The spring member is provided so as to be substantially perpendicular to the direction of the force that tries to lift the spring member, is formed so that the line of action of the force that tries to lift it passes near the axis, and rotates in the biasing direction of the spring member. A tape cassette mounting device characterized in that the engaging portion of the reel pressing member is displaced in the reel pressing direction as the reel is pressed.