JPS60164951A - Cassette loading and taking-out device - Google Patents

Abstract

PURPOSE:To reduce rotational load acting on a pulling roll when pulling a cassette into a holder by supporting the tip pivot of an oscillating arm that supports a cassette holder on a baffle plate that can oscillate freely in front of a frame until completion of sliding action for releasing of a sliding device. CONSTITUTION:The tip pivot 12 of the oscillating arm 10 supporting the cassette holder 4 is supported on the freely slidable baffle plate 27 until completion of sliding action for releasing a sliding rod. Consequently, excessive contact friction so far occured at the contact part between the sliding rod 23 and guide pins 8, 8 is not generated. Consequently, the sliding action of the sliding rod 23 is made only by force that resists a pulling spring 9, and the action becomes very nimble, and load applied to final action when pulling the cassette by a roll 16 can be reduced remarkably. Releasing action between a lock lever 39 and locking piece of a driving board 34 is very smooth, and as moving stroke of a checking face 42 and the sliding rod 23 is not equal, the accuracy of releasing action can be heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic tape cassette loading/unloading device for a VTR or other magnetic recording/reproducing device.

Prior art> As shown in FIG.
At the tip of the cassette holder 4, attach the central part of the upper surface of the cassette holder 4 to the pivot 12
The cassette holder 4 has an operating piece 6 facing into the holder 4 and a frame 1 on the side surface of the cassette holder 4.
A sliding rod 5 having a pin 7 fitted into a hook-shaped hole 2 formed on the side surface of the holder 4 is attached, and a spring 9 is stretched between the pin 7 and a pin 8 protruding from the side surface of the holder 4. and the sliding rod 5
is always applied in the direction of the arrow, and the holder 4 is held at the same height as the cassette insertion/ejection opening 3 by the horizontally long hole of the hook-shaped hole 2 through the pin 7, and the cassette (not shown) is inserted into the insertion/ejection opening 3. When the cassette is inserted in the direction of arrow A and pushed by the drive of the pull-in roll 16, the inner end surface of the cassette pushes the actuating piece 6 against the spring 9 to release the pin on the sliding rod 5. 7 moves through the horizontally elongated hole portion of the hook-shaped hole 2 to the end i, and is at the starting end position of the vertically elongated hole portion, where the holder 4 is allowed to descend. Therefore, holder 4 has its own weight and swing arm 1.
0. In addition, when the cassette starts to descend slightly due to the weight of the cassette, etc., the electric motor 17 moves the entrance part of the cam groove 15 in the spiral cam plate 14 which is already rotating via a transmission mechanism and the top of the swing arm 10. The arm 10 is forcibly rotated downward by the spiral cam plate 14 via the roll 13, so that the cassette holder 4 is held at a predetermined position. is stored in.

In order to lower and store the cassette holder 4 in a predetermined position in this manner, it is first important that the sliding rod 5 move smoothly along the hook-shaped hole 2.
Since the weight of the swing arm 10, cassette, etc. is supported by the pin 7 in the horizontally long hole of the hook-shaped hole 2, sliding resistance is large due to contact friction between the pin 7 and the hook-shaped hole 2. As a result, the cassette is inserted through the insertion opening 3, and when it comes into contact with the roll 16, the cassette is moved inward by the roll 16, and the final movement pushes the sliding rod 5, but at this time, the cassette is moved inward by the roll 16. The roll 16 had the drawback of requiring a large rotational force.

Apart from this, as shown in FIG. 2, the schematic mechanism is the same as that in FIG. A plate 34 is pivotally supported and interlocked with the cam plate 14 via a friction clutch mechanism, and a locking piece 3 is provided protruding from the peripheral side of the transmission plate 34.
5 comes into contact with the upper side of the brake piece 24 to stop the rotation of the transmission plate 34 while no cassette is inserted into the holder 4, and when a cassette is inserted, the insertion operation The sliding rod 23 is pushed, the brake piece 24 is released from the contact with the locking piece 35, and the transmission plate 34 is moved through the elongated hole 22 provided in the frame 18.
The blocking plate 27, which is slidably attached to the front surface of the frame 18, is slid by the connecting rod 30.

At that time, the end of the pivot shaft 12 between the holder 4 and the swinging arm 10 supported by the upper end of the blocking protrusion 26 of the blocking plate 27 is released,
The lowering movement of the holder 4 is enabled, and the retraction roll 16
We are trying to eliminate the excessive burden that affects people.

In the latter conventional example, since the brake piece 24 provided on the sliding rod 23 has the same sliding stroke as the cassette, it is not possible to more accurately detect the completion state of the four horizontal movements of the cassette.

<Object of the Invention> The present invention aims to reduce the rotational load acting on the pulling roll when pulling the cassette into the holder by improving the support mechanism of the cassette holder, and also makes the insertion operation of the cassette smooth and accurate. The purpose is to notify the descending block release mechanism.

<Structure of the Invention> An elevating mechanism that holds a cassette and lowers it to a predetermined position, a mechanism that prevents the elevating (and lowering) movement, and a mechanism that indirectly releases the blocking mechanism in response to the loading operation of the cassette. and an interlocking mechanism that receives power from a drive source and interlocks the release mechanism and the blocking mechanism.

<Example> To explain the example shown in detail below, first, the elevating mechanism is
A mounting piece 19 is provided on the other side of the frame 18 which has a cassette insertion/ejection port 3 on one side, and a swing arm 10 is attached to the mounting piece 19.
The base end of the swinging arm 10 is pivotally mounted on a pivot 11, and the roll 13 pivoted in the middle of the swinging arm 10 faces an arcuate hole 21 on the front surface of a frame 18 formed around the pivot 11. A central portion of the upper surface of the cassette holder 4 is pivotally supported at the tip of the arm 10 by a pivot 12, and the outer end of the pivot 12 and a pin 25 erected diagonally below the holder 4 are connected to the frame 18. The cassette holder 4 is held horizontally with respect to the frame 18 by inserting the cassette holder 4 into two arcuate holes 20 and 20' formed on the front surface of the arm 10, centering on the pivot point of the arm 10. It is configured to be able to move up and down as it swings.

The mechanism for preventing the cassette holder from moving up and down includes guide pins 29, 29 on the front surface of the frame 18 with a blocking plate 27 protruding from the frame 18, and elongated holes 28, 28 on the blocking plate 27.
A blocking protrusion 26 and a release notch 26' are formed on the upper half of the blocking plate 27 to receive the outer end of the pivot shaft 12 and prevent its downward movement. When the blocking plate 27 moves in the cassette insertion direction, the end of the pivot shaft 12 is released from the lowering blocking state.

Next, the release mechanism is located at the front of the cassette holder 4.
A sliding rod 23 having a bending operating piece 24 facing into the holder 4 from an opening 4'' provided at the right end is provided on the guide rods 8, 8 protruding from the left and right front sides of the holder 4 and on the sliding rod 23. long hole 8'
. , the sliding rod 23 is always pressed to the left, that is, in the direction of ejecting the cassette, and the sliding rod 23 is provided with a lock lever 39 having a stop surface 42 at the upper end, through a long hole 40 provided therein. pin 4
The proximal end of the portrait lock lever 39 engaged by holder 4
Furthermore, an interlocking mechanism is interposed between the release mechanism and the blocking mechanism to mutually interlock the two mechanisms by receiving power from a drive source, and the interlocking mechanism is connected to the frame. A cam plate 14 and a friction transmission plate 34, which are rotated by an electric motor 17 set at the right end of the frame 18 via an appropriate transmission mechanism, are pivotally mounted on the front surface of the frame 18 by a cylindrical shaft 33,
The transmission plate 34 faces into the frame 18 through an arcuate hole 22 provided near the right end of the frame 18 and has a lock lever.
A bent latch piece 35 is provided in a protruding manner to abut and latch on the restraining surface 42 of the transmission plate 39, and a connecting rod 30 is connected between the transmission plate 34 and the blocking plate 27, so that the transmission plate 34 has an arc-shaped hole. The cam plate 14, which is pivoted coaxially and adjacent to the transmission plate 34, transmits the rotational movement to the blocking plate 27 when the rotation of the frame 22 is rotated within the allowable range. A spiral groove 15 is formed to engage with the a-rule 13 on the swinging arm 10 facing outward from the arcuate hole 21, and a spiral groove 15 is formed to engage with the a-rule 13 on the swinging arm 10 facing outward from the arc-shaped hole 21. A friction member 32 interposed between the cam plate 14 and the transmission plate 34 constantly applies a frictional force between the drawing plates 14 and 34 by the helical spring 31, and a helical gear 14 is provided on the outer periphery of the cam plate 14. frame 1 from
The pulley 3 on the same axis passes through the relay gear 36 pivoted on the front of
7. It is interlocked with the cassette drawing roll 16 pivotally mounted on the upper edge of the frame 18 via a belt 38.

<Operation> The device of the present invention is constructed as described above. Next, we will discuss the series of operations of each of these mechanisms. First, we will look at the mutual states of each mechanism when the cassette is not inserted into the holder 4. The sliding rod 23 is connected to the cassette insertion/ejection port 3 by the spring 9.
The locking piece 35 of the transmission plate 34 comes into contact with the upper surface of the brake piece 24 to stop the rotation of the transmission plate 34, and in this state, the blocking plate 27 Like the moving rod 23, it moves in the direction of the cassette insertion/ejection port 3, and the swing arm 10 is mounted on the upper surface of the blocking protrusion 26 of the blocking plate 27.
supports the outer end of the pivot shaft 12 at the tip of the frame 18. In this state, when the cassette is inserted from the cassette insertion/ejection opening 3 of the frame 18 to a certain depth in the direction of the arrow, the power switch (not shown) of the electric motor 17 is set. Drive the electric motor 1f. Therefore, the rotation is caused to rotate the cam plate 14 at a constant speed in a predetermined direction (direction of arrow B) through a transmission mechanism such as a belt, ohm speed reducer, gear, etc.
The cassette drawing roll 16 on the upper edge of the frame 18 is simultaneously rotated from the gear 14' of No. 4 through a pulley 37 coaxial with the meshing gear 36 and a bell 38.

That is, the direction of rotation of the roll 16 is the direction in which the cassette is drawn into the holder 4, so that the cassette is pulled into the roll 16.
When the roll 16 is inserted into a position where it touches the top surface of the cassette, the rotation of the roll 16 sequentially feeds the cassette into the holder 4, and eventually the tip of the cassette slides and protrudes inward from the side surface of the holder 4. It comes into contact with the operating piece 24 of the rod 23 and pushes the sliding rod 23 in the direction of arrow A against the pulling pin 9. (See Fig. 4) As a result, the stopping surface 42 of the lock lever 39, which had hitherto stopped the rotation of the locking piece 35 on the transmission plate 34, now uses the pivot point of the lever 39 on the holder 4 as a fulcrum. In order to rotate and release the restraining action on the locking piece 35, the transmission plate 34 receives the rotational force of the cam plate 14 which is rotated by the driving force from the electric motor 17, and immediately rotates by the allowable range of the arcuate hole 22. The blocking plate 27 moves against the cam plate 1 via the connecting rod 30.
4 (in the direction of arrow C in FIG. 9), the contact between the pivot 12 at the tip of the swinging arm 10 and the blocking protrusion 26 is released.

Therefore, the pivot shaft 12 is in a state where it can be lowered into the notch groove 26', and since the cassette, holder, arm, and other devices have been supported on the blocking protrusion 2G, they are shaken together with the release operation. The movable arm 10 starts to descend, and when it has descended slightly, the roll 13, which is pivoted in the middle of the movable arm 10, is wound into the entrance of the spiral groove 15 in the cam plate 14, which is waiting while rotating. Thereafter, the roll 13 is forced to move downward by the spiral groove 15, and the cassette holder 4 is left stationary at a predetermined position.

In the above, the cam plate 14 is continuously rotated by the electric motor 17, but while the transmission @34 is stopped by the braking surface 42 of the lock lever 39, the cam plate 14 and the transmission plate 3
The continuous rotation of the slip cam plate 14 is absorbed by the friction member interposed between the cam plate 14 and the cam plate 14.

As described above, when the cassette V is housed in the holder 4, the braking action of the interlocking mechanism is released, and at the same time, the power from the electric motor 17 is transmitted to the blocking plate 27, thereby releasing the action of preventing the cassette holder 4 from descending. This prompts the holder 4 to move downward.

Effects> The present invention has the above-described structure and operation, and allows the tip shaft 12 of the swing arm 10 that supports the cassette holder 4 to slide on the freely slidable blocking plate 27 attached to the front surface of the frame 18. Since the rod 23 is supported until the four sliding operations for releasing it are completed, excessive contact is caused at the contact portion between the sliding rod 23 and the guide pins 8, 8 as before. No friction occurs, and as a result, the sliding movement of the sliding rod 23 is performed only by the force against the tension spring 9, making the movement extremely light, and the final movement when inserting the roll 161 (1) cassette (H'). This can significantly reduce the burden on people.

Further, the release operation between the lock lever 39 and the locking piece 35 of the transmission plate 34 is extremely smooth, and since the movement distance of the stop surface 42 and the movement distance of the sliding rod 23 are not equal, the accuracy of the release operation can be improved. .

Therefore electric! ! Since the driving force of 17 is also small, it is compact and has the effect of transmitting the movement to the outside and each machine groove more smoothly.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional device, Fig. 2 is a front view of another conventional device, Fig. 3 is a front view of the device of the present invention, and Fig. 4 is a front view showing the operating state of Fig. 3. Figure 5 is a front view of the frame, Figure 6 is a front view of the holder, Figure 7 is a front view of the cam plate and interlocking plate, Figure 8 is a sectional view taken along the line X-X of Figure 7, and Figure 9 is the blocker. FIG. 10 is a partial functional diagram showing the moment of release of blocking, and FIG. 11 is a partial functional diagram of the final state of releasing blocking. Applicant Sharp Co., Ltd. Agent Harumi Suzuki Figure 1 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 10 Procedural amendment (method) % formula %

Claims (1)

[Claims] An elevating mechanism that holds the cassette and moves the cassenothorg downward to a predetermined position, a blocking mechanism that temporarily blocks the descending movement of the elevating mechanism, and a locking mechanism that interlocks the blocking action of the blocking mechanism in response to the loading operation of the cassette. The blocking mechanism consists of a mechanism that indirectly performs a releasing action, and an interlocking mechanism that is interposed between the blocking mechanism and the releasing mechanism to immediately transmit power from the drive source to the blocking mechanism upon receiving the releasing action. A cassette loading/unloading device characterized in that the releasing operation is performed by the power of an elevating mechanism.