JPH06290522A - Cassette door driving device for auto-changer - Google Patents

Abstract

PURPOSE:To obtain a simple and high reliable cassette door opening and closing mechanism for an auto-changer device. CONSTITUTION:A turning fulcrum 19j of a door arm 72 for driving a cassette door is provided in an auto-changer frame body 19, and is so driven that its one end 72b on the side to be abutted on the cassette door 70 is brought into both positions of entering and retreating a housing body 16. Under the entering state, the end 72b is abutted on the cassette door 70 to open this door, whereas under the retreating state, the end 72b is not abutted on the cassette door 70 to be free from obstructing a housing body 14 in its vertical movement. The cassette door 70 is energized to become the closed state by a spring 77 in the case of noncontact with the door arm 72.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder having an automatic changer function for automatically exchanging a plurality of cassettes.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an automatic changer for a conventional video tape recorder.

FIG. 7 and FIG. 8 are cross-sectional views of a main part showing an outline.

In FIG. 7, 9 is an autochanger, and 8 is a video mechanism body.

The cassette 15 is inserted from the left side of the drawing, passes through the auto changer 9, and is attached to the video mechanism body 8 on the right side of the drawing.

FIG. 8 shows the autochanger portion in more detail. Reference numeral 19 is an autochanger frame.
Is a cassette housing, and 16 and 18 are storage chambers in the cassette housing 14, respectively. Reference numerals 70 and 71 are cassette doors provided in each accommodation chamber. Reference numerals 25, 40 and 46 denote horizontal transfer means.

The case where the cassette is inserted into the storage chamber 16 will be described. The cassette 15 is inserted from the front panel 2 side and is accommodated in the accommodation chamber 16 while pushing the cassette door 70 to open it. At this time, the cassette door is cassette 1.
It is pushed and released by 5. Next, when a predetermined command is issued, the cassette 15 is moved to the horizontal transfer means 25, 40, 46.
When the cassette 15 stops pushing the cassette door 70, the cassette door 70 is closed by a spring force or its own weight (not shown).

These operations are the same when the cassette 15 is inserted into the storage chamber 18.

[0009]

However, in the above-mentioned prior art, the opening / closing operation of the door is described when the cassette 15 is inserted from the front panel 2 side. No consideration was given to the operation when inserted in.

An object of the present invention is to provide a simple and highly reliable opening / closing mechanism for a cassette door in the above autochanger device. That is, the cassette container 14 is not equipped with a means for opening the cassette door 70, which makes it possible to reduce the weight of the cassette container and simplify the construction of the cassette door opening / closing means, and to open / close the cassette door during the raising / lowering operation of the cassette container. (EN) Provided is an automatic changer mechanism having high operation reliability in which the means does not hinder the lifting operation.

[0011]

In order to achieve the above object, as shown in FIG. 4, a rotation fulcrum 19j of a door arm 72 for driving a cassette door is provided on the automatic changer frame body 19 so as to contact the cassette door 70. The one end 72b is driven so as to take both the intruding position and the retracting position. In the invaded state, the cassette door 70
Is in a position where it does not come into contact with the cassette door 70 when it is in a retracted state after being opened.
Make sure the position does not hinder the vertical movement of. The cassette door 70 is biased by a spring 77 so as to be in a closed state when the door arm 72 is not in contact. Further, the other end of the door arm with respect to the fulcrum 19j is engaged with and driven by a cam 73 provided on a cam gear 23 which is a vertically moving means of the cassette housing 14.

[0012]

When the cassette door 70 is opened, the cam gear 23
The rotation of the door arm 72 drives the one end 72 of the door arm 72.
The opening operation is performed when b enters the cassette housing 14 and pushes the cassette door 70. At this time, the cam portion of the cam gear 23 is set so that the cassette housing 14 is maintained at the same height in the height direction. When the cassette door 70 is closed, the cam gear 23 similarly rotates in the opposite direction, so that the one end 72b of the door arm 72 retreats from the cassette housing 14 and stops the pressing of the cassette door 70. A spring force that urges the cassette door 70 in the closing direction acts on the cassette door 70, and the pressing is stopped to close the cassette door 70.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a vertical driving means for moving the cassette housing 14 up and down. As shown in the figure, a side surface 19a of the frame body 19 of the autochanger 9
A vertical drive motor 20, a vertical gear group 21, and a cam gear 23 are attached to the.

The cam gear 23 has a first cam 26 for controlling the amount of the side roller 25 for carrying the cassette to enter the cassette housing 14, and a pin 28 of a link 91 for moving the cassette housing 14 up and down. With the second cam 29 engaged with the door arm 72 for driving the doors 70, 71.
Is formed with a third cam 73 with which the pin 72a is engaged.

A side roller 25, which is a transfer means for horizontally transferring the cassette 15, is provided in the cassette container 14.
Holes 75 and 76 are provided in each of the storage chambers. The side roller 25 has the above-mentioned penetration holes 75 and 76.
Thus, the cassette 15 can be conveyed in the horizontal direction when it is invaded, and the cassette container 1 when it is detached.
4 is adapted to selectively take a position in which it can move up and down, and this is performed in conjunction with the first cam 26 described above.

Reference numeral 81 is a switch for detecting that the cassette is completely accommodated in the cassette container 14, and is operated by the insertion lever 80. The insertion lever 80 is the frame 1
It is mounted rotatably with the shaft portion 19h planted in 9 as a fulcrum, and is urged in the counterclockwise direction in the drawing by a spring 82, thereby pressing the switch 81. The insertion lever 80 is provided with a convex portion 80b. When the cassette 15 is completely accommodated in the cassette housing 14, the convex portion 80b is pushed by the tip of the cassette 15, whereby the insertion lever 80 is It is rotated against the urging force of the spring 82, the pressing of the switch 81 is released, and it is detected that the cassette is inserted.

The frame 19 of the autochanger described above
A transmission gear train 43 for rotating the side roller 25 is disposed on the side surface 19a of the conveyance motor 34 (see FIG. 2).
Rotation of the side roller 25 and the conveyance roller 40.
Communicate to. The cassette 15 is horizontally transported by the side roller 25 and the transport roller 40.

FIG. 2 shows a function of transporting the cassette inserted from the insertion opening 10 of the front panel 2 to a predetermined position of the cassette housing 14 and discharging the cassette in the cassette housing 14 from the insertion opening 10 to the outside. Also, a cassette carrying means having a function of feeding the cassette from the cassette housing 14 to the insertion opening 11 of the video mechanism main body 8 and housing the cassette discharged from the insertion opening 11 in the cassette housing 14 is shown. is there.

As shown in FIG. 2, a transportation motor 34 and a reduction gear group 35 are attached to the rear surface 19c of the frame 19 of the autochanger 9, and a reduction gear group 34 is provided on the side surface 19a. The rotation of the motor 34 is transmitted to the side roller 25. A door arm 72 and a cam gear 23 are attached to the side surface 19a of the frame body 19, and one end 72a of the door arm 72 is engaged with a cam groove of the cam gear 23. The cassette door 70 is installed in the cassette container 14
It is attached with 0a and 70b as fulcrums. A torsion spring 77 is coaxially wound around the fulcrum 70a.

FIG. 3 is a view showing a link mechanism for moving the cassette housing 14 up and down.

Reference numeral 14 is a cassette housing, and 90 and 91 are links. The links 90, 91 are rotatably assembled with the pin 92 as a fulcrum. One end 90b of the link 90
Is rotatably attached to the cassette housing 14, and the other end 90a is movably attached to the elongated hole portion 19d of the frame body 19 along the hole shape. Also, the link 91 has one end 91
a is rotatably attached to the frame body 19, and the other end 91b is
It is movably attached to the elongated hole portion 14d of the cassette housing body 14 along the hole shape. The cassette housing 1
The long hole portion 14d of No. 4 is the entry hole 7 of the side roller 25
It is located approximately halfway between 5,76. The rotation of the cam gear 23 actuates the links 90 and 91 to operate the cassette housing 14
Are driven up and down in parallel.

FIG. 4 is a view showing the door opening / closing mechanism. The figure shows a state in which the height of the storage chamber 16 matches the insertion opening 11. In the third cam 73 of the cam gear 23,
Door arm 72 pivotally supported on the side surface 19a of the frame body 19
The pin 72a at one end is engaged and the other end 72b is arranged at a position where it can abut the cassette door 70. Door 70
The pin portion 70a at one end is rotatably supported by the cassette housing 14. A torsion spring 77 is wound around the pin portion 70a to urge the door 70 clockwise in the drawing.

The rotation of the cam gear 23 causes the door arm 72 to move.
Can rotate to open and close the door 70. The same applies when the height of the storage chamber 18 is the same as the insertion port 11.

FIG. 5 is a view showing a state where the cassette is housed in the cassette housing 14. In the figure, the frame body 19 of the autochanger is provided with a second positioning portion 19e on the side of the front panel 2 and a first positioning portion 19d on the side of the video mechanism body. The up-and-down movement of the cassette is performed inside these positioning portions, and it is necessary that the cassette 15 is also accommodated inside this.

Here, the dimension L1 of the convex portion 80b of the insertion lever 80 and the second positioning portion 19e when the cassette 15 is not inserted is the dimension L2 of the cassette 15.
It is taken larger. Thereby, the cassette container 1
After the cassette 15 is completely inserted into the frame 4, even if the cassette 15 is returned to the side of the second positioning portion 19e by the urging force of the spring 82 that urges the insertion lever 80, the cassette 15 is not moved to the outside of the frame body 19. It never comes out.

In FIG. 6, (1) shows a cam diagram of the second cam 29 of the cam gear 23, and (2) shows a cam diagram of the third cam 73. This second cam 29
Is provided with 6 positions depending on its stop position. Further, the third cam 73 is provided with a cam that operates the door arm 72 to open and close the cassette, and corresponds to the previous 6 positions.

In the figure, A is the position where the first storage chamber 16 coincides with the insertion opening 10 of the front panel 2.

B is a position where the first storage chamber 16 is aligned with the insertion opening 10 of the video mechanism body 8.

B'is the position where the first storage chamber 16 is aligned with the insertion opening 10 of the video mechanism body 8 and the cassette door is open.

C is the position where the second storage chamber 18 coincides with the insertion opening 10 of the front panel 2.

D is a position where the second storage chamber 18 coincides with the insertion opening 11 of the video mechanism body 8.

D'is the position where the second housing chamber 18 is aligned with the insertion opening 11 of the video mechanism body 8 and the cassette door is open.

FIG. 3 shows the state A.

Next, the operation of this embodiment will be described.
The second cam 29 of the cam gear 23 is in the state of FIG. 6A, that is, the first storage chamber 16 of the cassette storage body 14.
The following description will be made assuming that the initial height is the same as the height of the front panel 2 (the state of FIG. 1).

In the state shown in FIG. 1, when the cassette 15 is inserted into the cassette housing 14 through the insertion opening 10 of the front panel 2 while passing through the cassette door 70, this is detected by a sensor (not shown). The control circuit rotates the carrying motor 34 of FIG. 2 in the inserting direction. The rotation of the transfer motor 34 is controlled by the transmission gear train 35,
It is transmitted to the conveying roller 40 and the side roller 25 by 43 and is rotated in the inserting direction. The cassette 15 inserted into the cassette container 14 is driven by the side roller 25 and further conveyed in the depth direction. Then, the first positioning portion 1 of the frame body 19 shown in FIG.
At the same time when the front end surface of the cassette 15 comes into contact with 9d, the insertion lever 80 is rotated and the completion of accommodation is detected by the switch 81, and the conveyance motor 34 shown in FIG.
Stops rotating.

Then, the control circuit causes the vertical drive motor 20 to rotate in the direction in which the cassette housing 14 is lowered. The rotation of the vertical drive motor 20 is transmitted to the cam gear 23 via the reduction gear group 21. Cam gear 2
When 3 starts to rotate, the action of the first cam 26 is transmitted to the side roller 25 by the transmission link group 30, and the side roller 25 is retracted from the inside of the cassette housing 14. At this time, the cassette container 14 has not yet started to descend.
When the cam gear 23 further rotates, the action of the second cam 29 causes the link mechanism 90 engaging with this cam to
The cassette container 14 supported by this descends while maintaining the parallel state. Then, when the second cam 29 comes to the position B in FIG. 6, the transmission link group 30 is reversed from the above by the rotation at this position B (rotation within the angular range not involved in the vertical movement of the cassette housing 14). The side roller 25 enters the cassette housing 14 by operating in the direction, and the completion timing of this entry is detected by a mode switch engaged with the cam gear 23 (not shown), and the cassette 15 in the first housing chamber 16 is detected. The rotation of the vertical drive motor 20 is stopped in a state in which is aligned with the insertion opening 11 of the video mechanism body 8.

Thereafter, the control circuit causes the carrying motor 3 to move.
4 rotates again in the inserting direction, and the side roller 25 conveys the cassette 15 further in the back. When the tip of the cassette 15 reaches the transport roller 40, the transport roller 40 and the elastic roller 46 sandwich the cassette 15 to continue transporting the cassette, and the cassette is mounted by a known transport mechanism (front loading mechanism) in the video mechanism body 8. It is transported and attached to the position (use position).

Next, regarding the opening and closing of the door during the storing operation from the main body mechanism to the auto changer mechanism, FIG.
Will be explained. The state where the height of the first storage chamber 16 of the cassette housing 14 matches the insertion opening 10 of the front panel will be described as an initial stage. (A in FIG. 5) When a predetermined calling operation is performed, the vertical drive motor 20 first rotates, and the cam gear 23 rotates through the series of transmission paths. The cassette housing 14 first descends in conjunction with the rotation of the cam gear 23, and the descending operation stops when the height of the first housing chamber 16 matches the insertion opening 11 of the video mechanism body 8. The cam gear 23 further rotates in the same direction, and the door arm 72 engaged with the cam portion 73 is rotated by the action of the cam portion 73 of the cam gear 23, and the one end 72b of the door arm 72 is opened at the opening 1 of the cassette housing body 14.
4i invades and opens the door 70. This opening completion timing is detected by the mode switch meshing with the cam gear 23 (not shown), and the rotation of the vertical drive motor 20 is stopped. When the completion of opening the mode switch is detected, the front loading mechanism starts the discharging operation, and at the same time, the transport motor 34 starts rotating in the direction opposite to the insertion direction, and the transport roller 40 and the side rollers are rotated. The roller 25 is rotated in the discharging direction. The cassette 15 is sent to the carrying roller 40 by the front loading mechanism, and the carrying roller 40 and the elastic roller 4
6 and the upper and lower parts are sandwiched and conveyed into the cassette container 14. The cassette 15 is continuously conveyed by the side rollers 25, and when the cassette 15 is completely accommodated in the cassette container 14, it is detected by a sensor (not shown) to convey the motor 3 for conveyance.
The rotation of 4 stops. Next, according to a command from the control circuit, the vertical drive motor 20 again rotates in the opposite direction to the previous direction, and in conjunction with this, the cam gear 23 also rotates in the opposite direction to the previous direction. The door arm 7 is interlocked with the rotation of the cam gear 23.
2, the side roller 25 retracts from the cassette container 14, and when the retract is completed, the cassette container 14 rises,
The ascending stops when the heights of the insertion opening 10 of the front panel 2 and the storage chamber 16 match. Further, the cam gear 23 continues to rotate, and when it is detected that the side roller 25 has entered the cassette housing 14, the vertical drive motor 20 stops. Here, the door arm 72 is the cassette container 14
Before it rises, it is retracted from the container 14, but since the cassette door 70 is on the upper surface of the cassette 15, it is held open. When the rotation of the vertical drive motor 20 is stopped, the transport motor 34 is rotated to rotate the side rollers 25 and eject the cassette 15.

[0040]

According to the present invention, the opening and closing of the cassette door provided in each storage chamber can be operated by the mechanism provided outside the movable cassette housing. Therefore, even in the case of a cassette housing having a plurality of housing chambers, only one set of opening / closing mechanism can be used, and the number of parts can be reduced.

Further, since the operation of the door arm and the ascending / descending operation of the cassette housing are performed by the same cam gear, the operations of both can be perfectly synchronized and a highly reliable operation can be achieved.

[Brief description of drawings]

FIG. 1 is a side view of an autochanger according to an exemplary embodiment of the present invention.

FIG. 2 is a top view of an autochanger according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing a link mechanism for moving a cassette housing up and down according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing an opening / closing mechanism of a cassette door according to an embodiment of the present invention.

FIG. 5 is an explanatory view showing a housed state of a cassette according to an embodiment of the present invention.

FIG. 6 is a cam diagram showing linearly the shapes of the second cam and the third cam of the cam gear according to the embodiment of the present invention.

FIG. 7 is a schematic diagram of a conventional autochanger.

FIG. 8 is a detailed view of a main part of a conventional auto changer.

[Explanation of symbols]

 2 ... Full-face panel, 8 ... Video mechanism main body, 9 ... Auto changer, 14 ... Cassette housing, 15 ... Cassette, 16 ... First housing chamber, 18 ... Second housing chamber, 19 ... Frame body, 20 ... Vertical drive Motor, 23 ... cam gear, 25 ... side roller, 70, 71 ... cassette door, 72 ... door arm, 80 ... insertion lever, 90, 91 ... link mechanism.

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus with an auto-changing function, which has an auto-changing device arranged between a front panel of the apparatus and a magnetic recording / reproducing mechanism body in the apparatus.
A vertically movable cassette housing having a frame body of the auto change device and a plurality of cassettes that can be stacked in the frame pair through a partition plate and has a cassette door for blinding in each storage chamber A body, a vertical movement driving means for vertically moving the container, and a horizontal moving means for horizontally moving the cassette in the cassette housing at a predetermined height position. A door arm for closing the cassette door in the retracted state and opening the cassette door in the retracted state, and a drive means for driving the door arm. Automatic changer cassette door drive characterized by 2. The driving mechanism for the door arm according to claim 1, further comprising a cam gear having a cam for vertically moving the cassette housing, wherein the cam gear is rotatable within a rotation angle range not involved in the vertical movement of the cassette housing. A cassette door driving device for an automatic changer, characterized in that the arm is driven.