JPS61253668A - Installing mechanism for magnetic disk cassette - Google Patents

Abstract

PURPOSE:To decrease the number of parts and to simplify a structure by constituting the titled mechanism so that a cassette switch is operated by only inserting a cassette, a worm wheel with a cam rotates, a tray and a connecting plate are moved and a cassette guide is made to descend and installed automatically. CONSTITUTION:When a cassette 1 is inserted, the pin 26b of a lever 26 abuts on the end edge of a shutter, a switch 27 becomes on, a motor 32 rotates, a worm wheel 29 with a cam rotates in a direction E, cams 29a, 29c are displaced in the same direction, an arm 28 turns in the direction H and a tray 20 slides in a direction A by a spring 20a. At the same time, the pin 24b of a link arm 24 moves to the left end side of a long hole 24d and starts to turn in a direction C and the cam 29a also rotates and is separated from a connecting plate bending part 25a, therefore, a connecting part 25 also moves to the right. Next, the pin 24b descends by turning the link arm 24 and the tray 20 sets the cassette 1 onto positioning pins 34, 35. The projection 29e of the worm wheel 29 contacts to a contact piece 31a and the rotation of the motor 32 stops. On the other hand, when discharging the cassette, the reverse operation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette mounting mechanism for automatically mounting and ejecting a magnetic disk cassette (hereinafter abbreviated as cassette).

[Summary of the Disclosure] This specification and drawings describe a magnetic disk device using a magnetic disk cassette, which includes a tray that is constantly biased in the direction of insertion of the cassette by a spring, a cassette guide that is attached to the tray so as to be movable up and down, and This cassette guide is connected to the base side of the device, and two link arms on the left and right engage with elongated holes formed on both sides of the tray through pins in the middle, and these link arms a slidable connecting plate connected to a pin in the middle; a worm wheel having a cam that engages with the tray and the connecting plate, respectively; provided on the back side of the tray;
A cassette switch that detects the attachment of a cassette and rotates a cam-equipped worm wheel based on the signal, and a home position detection switch and an attachment completion switch that are operated by the cam-equipped worm wheel and control its rotation. The present invention discloses a technique for automatically loading a cassette by providing a cassette.

[Prior Art] Various cassette mounting mechanisms are known that can automatically load and eject a cassette provided in a magnetic disk device.

Most of these mechanisms use many levers and slide members, and are configured to automatically load and eject the inserted cassette by interlocking these members.

[Problems to be Solved by the Invention] However, the conventional mechanism having the above-mentioned structure has a large number of levers and slide members, and since these work together to perform loading and unloading operations, the timing is slightly delayed. There was a problem in that there was a high incidence of failures such as failure to perform interlocking operations even when the device was rotated, and the assembly process was also increased due to the large number of parts, resulting in high costs.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a tray that is constantly biased by a spring in the direction of insertion of the cassette, and a cassette guide that is attached to the tray so as to be movable up and down. , two link arms on the left and right that connect the cassette guide to the base side of the device, and that engage with elongated holes formed on both sides of the tray through bins in the middle; a slidable connecting plate connected to the healing bin of the link arm; a worm wheel having a cam that engages with the tray and the connecting plate, respectively; A structure is adopted that includes a cassette switch that detects and rotates a cam-equipped worm wheel based on the signal, and a home position detection switch and a mounting completion switch that are operated by the cam-equipped worm wheel.

[Function] When the above-described structure is adopted, the cassette switch is activated simply by inserting the cassette to a predetermined position, and the tray and connecting plate are moved by rotation of the worm wheel with a cam, and the cassette is guided through the link arm. The magnetic disk cassette can be automatically positioned and installed by lowering the magnetic disk cassette.

Furthermore, since the number of interlocking members is minimized, the entire device can be simplified and the occurrence of failures can be minimized.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings. .

[Description of Cassette (FIG. 2)] First, the outline of the cassette applied to this embodiment will be explained with reference to FIGS. 2(A) and (B).

The cassette indicated by reference numeral l in both figures is formed by stacking and integrating upper and lower cassette halves molded from plastic or the like to form a flat housing.

A rectangular recess 1a is formed in the upper and lower surfaces along the side edge of the cassette 1 in the mounting direction, and a shutter 2 is slidably fitted into this recess.

The shutter 2 has a flat U-shaped cross section, and is biased by a spring (not shown) in the direction in which the opening 3 of the shutter 2 closes the head window 4, as shown by the chain line in the figure.

Furthermore, a notch 5 is formed on one shoulder in the mounting direction to form a slope for detecting whether or not the cassette has been inserted correctly.

Further, a write inhibit state detection section 6 is provided near the front end of the cassette 1.

On the other hand, an opening 1b is formed in the center of the back side of the cassette 1, and a center hub 9 fixed to the center of the magnetic disk accommodated in the cassette faces into this opening.

This center hub 9 has openings 9a and 9b into which a rotating shaft lO of a motor (not shown) and a drive bin 11 are fitted.
is formed.

Furthermore, semicircular recesses 7 are formed on both sides of the rear surface of the cassette in the vicinity of the leading end in the mounting direction.

Further, in the vicinity of the recess 7, openings 8a and 8b for positioning are provided.
is formed.

[Explanation of the cassette loading mechanism (Figure 1) First, Figure 1 (A
) and (B), the overall structure of the cassette mounting mechanism will be explained.

In the figure, the reference numeral 20 indicates a tray, which is a main component for inserting, ejecting, chucking, and releasing cassettes.

A spring 20a is stretched between the tip of the tray 20 and a protrusion 20b protruding from the base 33 of the device, giving the tray 20 the ability to move in the direction of arrow A.

Further, hooks 20c are provided near the tips of the left and right edges of the tray 20 to fit into the recess 7 of the cassette 1 and fix the cassette 1 to the tray side.

Further, as shown in FIG. 1(B), four elongated holes 20d are formed in the left and right rising portions of the tray 20 along the horizontal direction, two on each side.

On the other hand, a projecting piece 20f projects from approximately the center of the left and right rising parts of the tray 20, and a long hole 20e is formed in the vertical direction in this projecting piece 20f.

On the other hand, left and right sets of cassette guides 21 are arranged above the tray 20 and on the left and right side edges. The cassette guide 21 has a substantially U-shaped cross section.
A member 21a of the receiver for receiving the cassette 1 is provided horizontally protruding inward on the lower side, and a bent portion 21c is provided on the upper side protruding inwardly, and these cassette guides 21
A pin 21b that fits into the protruding piece 20f is protruded from the outer surface of the protruding piece 20f.

Therefore, the cassette guide 21 can only move in the vertical direction with respect to the tray 20.

The receivers correspond to the front and rear ends of the member 21a, and the tray 20 has quadrilateral openings 22 into which positioning pins 34 and 35 fit.
is formed.

On the other hand, what is indicated by the reference numeral 24 is a link arm that is shaped like a "<" toward the front, and its lower end is attached to the base 3.
It is rotatably supported on the 3 side via a pin 24a,
There are a total of four, two on the left and two on the left.

The left and right link arms 24, 24 are rotatably supported on a long and thin connecting plate 25 via a pin 24b at a bent portion in the middle thereof. This connecting plate 25 is located on the left and right outer sides of the tray 20, and a bent portion 25a is formed at the rear end thereof horizontally and inward as shown in FIG. 1(A).

Further, elongated holes 21d are formed in the side surface of the cassette guy 21 along the horizontal direction at a predetermined distance apart from each other in the front and rear.

21d is formed. Pins 24c protruding from the upper ends of the link arms 24 are provided in these elongated holes 21d.
are slidably fitted.

Further, a spring 24d is stretched between the middle of the link arm 24 and the base 33, and the link arm 24 is balanced in the state shown in FIG. 1(B).

However, when the operation described below occurs, the spring 24
d gives the link arm 24 a rotational force in a certain direction.

On the other hand, one end of a shutter release lever 26 is rotatably supported via a pin 26a at a position near one side of the distal end of the tray 20, and a pin 1 is provided on the lower surface of the free end side of the lever.
6b is provided protrudingly.

A spring 26c gives it the ability to rotate in the direction of the arrow.

Furthermore, an upwardly bent portion 27a is formed at the tip of the tray 20 on the side where the shutter release lever 26 is provided, and an inner portion of the bent portion 27a is provided with a bending portion 27a as the shutter release lever rotates. A switch 27 is fixed, which turns on and detects that the cassette is installed in the correct position.

On the other hand, one end of the arm 28 formed in a substantially L-shape is located on the base 33 outside the bent portion 27a at the bent portion 25a.
It is rotatably supported via a shaft 28b on the lower side. The other end of this arm 28 is in contact with the bent portion 27a via a pin 28a.

The role of this arm 28 is to hold the tray 20 against the spring 20a.
The purpose is to prevent the tray 20 from moving in the direction of arrow A due to the tensile force. A cam-equipped worm wheel 29 is arranged further back from the arm 28 and serves as a driving source for the chucking release and cassette ejection operations.

[Description of worm wheel with cam (Fig. 6) Details of this part are shown in Figs. 6 (A) and (B).

The worm wheel 29 with a cam is the worm wheel 29
b, which meshes with a worm gear 32a fixed to the output shaft of a motor 32 that can rotate in forward and reverse directions.

An upper cam 29a is fixed at an eccentric position on the upper surface of the worm wheel 29b, and this cam is connected to the bent portion 2.
It touches the outer edge of 5a.

Further, an L side cam 29a is provided on the lower surface of the worm wheel 29.
A lower cam 29c is protruded so as to partially overlap the lower cam 29c, and this cam comes into contact with the outer edge 28c of the arm 28, thereby regulating the movement of the arm 28 and indirectly regulating the movement of the tray 20.

Further, on the outer peripheral edge of the support shaft of the worm wheel 29b, a protrusion 29d is provided, which is shifted by a predetermined angle and also shifted in the vertical direction.
29e is provided protrudingly.

These protrusions 29d and 29e are protrusions for detecting the position of the cam-equipped worm wheel 29.

On the other hand, a switch 30 for detecting a home position and a switch 31 for detecting completion of mounting of the cassette are provided near the worm wheel 29b.

Each contact piece 30a is in a position where it can come into contact with the protrusion 29d, and the contact piece 31a is in a position where it can come into contact with the protrusion 29e.

When each contact piece and the protrusion come into contact, a home position detection signal 30s and a cassette installation completion signal 31s, which will be described later, are generated.

[Explanation of control circuit (Figure 7)] FIG. 7 shows a block diagram of the control circuit.

In FIG. 7, the reference numeral 60 denotes a control section to which, in addition to the signals from the switches described above, signals from a cassette ejection switch 61 (not shown) are input.

The control unit 60 controls the motor 32 with various signals via the motor drive circuit 62, and controls the cassette device and the ejection mechanism 63.
operate the whole thing.

[Description of Operation (FIGS. 3 to 5 and FIG. 8)] Next, the operation of this embodiment configured as described above will be explained.

Before loading the cassette, the cassette loading mechanism is shown in Figure 1 (
The state is shown in A) and (B).

In this state, the cam 29c is in contact with the arm 28 and the arm 28
The tray 20 resists the tensile force of the spring 29a through the
Press in the direction of arrow B (l/).

The contact piece 30a and the protrusion 29d are in contact with each other, and as shown in FIG. 8, a signal 30s for detecting that the tray is at the home position is turned on. Further, the motor 32 is stationary and moves I/).

Further, the cam 29a is also in contact with the bent portion 25a, as shown in FIG.
As shown in B), it is pushed as much as possible to the left in the figure.

In this state, as the cassette 1 is installed along the cassette guide 21, the bin 2 of the shutter release lever 26 will eventually be installed.
6b hits the edge of the closed shutter and begins to open.

Eventually, the hook 20c is fitted into the recess 7 of the cassette l and locked, and at the same time the switch 27 is turned on and the eighth
As shown in the figure, the cassette mounting signal 27s turns on, and at the same time the motor drive signal 32s turns on, the remoter starts rotating, and the cam-equipped worm wheel 29 moves in the direction of arrow E (
It begins to rotate in the mounting direction).

With this rotation, the cams 29a and 29c are displaced in the same direction,
The arm 28 is rotated in the direction of the arrow H, and the tray 20 is slid in the direction of the arrow A by the force of the spring 20a. At the same time, the pin 24b of the link arm 24 moves through the elongated hole 20d and contacts the left end side of the elongated hole 24d in FIG. 3(B).

When the arm 28 further rotates in the direction of arrow H from this position, the tray 20 further slides in the direction of arrow A, and accordingly, the link arm 24 begins to rotate in the direction of arrow C in FIG. 3.

At this time, the cam 29a also rotates and moves away from the bent portion 25a of the connecting plate 25, so that the connecting plate 25 also moves to the right in FIG.

When the link arm 29 rotates in the direction of arrow C, a rotational force in the direction of arrow C is applied to the link arm 24 by the force of the spring 24d.

This state is shown in FIGS. 3A and 3B, and the sliding operation of the tray 20 in the direction of arrow A is completed up to this point.

Thereafter, even if the cam-equipped worm wheel 29 rotates, the arm 28 contacts the base end of the cam 29c as shown in FIG. 4(A) and is not displaced, so that the tray 20 does not slide.

The rotation of the link arm 24 in the direction of arrow C is restricted within a predetermined angular range because the bent portion 25a of the connecting plate 25 contacts the base of the cam 29a as shown in FIG. 4(A). will be done.

Therefore, the link arm 24 gradually rotates in accordance with the displacement of the cam 29a.

This state is shown in FIGS. 5(A) and 5(B).

On the other hand, since the intermediate pin 24b of the link arm 24 descends as the link arm rotates, the tray 20 descends as shown in FIGS. 4 and 5, and the cassette 1 is correctly positioned on the positioning pins 34 and 35. is set.

On the other hand, in this state, the protrusion 29e provided on the cam-equipped worm wheel 29 comes into contact with the contact piece 31a, and a mounting completion signal 31s is generated, and this signal stops the rotation of the remoter 32 and completes the cassette mounting operation.

On the other hand, the cassette ejecting operation is completely opposite to the above-described operation.

In other words, to summarize, the cassette ejection switch (not shown) provided on the device side or the ejection signal 6 from the host side
1s, the motor 32 rotates in the opposite direction to that when installed,
The cam-equipped worm wheel 29 rotates in the direction of arrow F, pushing the tray 20 in the direction of arrow B and raising it to the state shown in FIG. Then, when the home position detection switch 30 is turned on, the rotation of the motor is terminated by the signal 30s.

In this state, the outer end of the cassette 1 can be grasped with fingers and pulled out.

Although mechanical switches are used as various detection switches in the embodiments described above, non-contact sensors such as optical sensors may also be used.

[Effects of the Invention] As is clear from the above description, the present invention provides an automatic loading and ejecting type cassette loading mechanism that has a relatively small number of parts, has a simplified structure, and can operate reliably with few failures. Obtainable.

[Brief explanation of drawings]

The figure is for explaining one embodiment of the present invention, and FIG. 1(A)
, CB) are a plan view and a side view explaining the structure of the entire mechanism, FIGS. 2(A) and (B) are a plan view and a bottom view of the cassette, and FIGS. 3(A), (B) to 5. (A) and (B) are a plan view and a side view explaining the operation, Fig. 6 (A) and CB) are a plan view and a side view showing the cam-equipped worm wheel portion, and Fig. 7 is a block diagram of the control circuit. , FIG. 8 is a timing chart of signals of each switch. l...Cassette 20...Tray 21.
...Cassette guide 24...Link arm 25...Connection plate 26...
・Shutter release lever 27...Cassette switch 28...Arm 29...Worm wheel with cam 30...Home position detection switch 31...Installation completion switch 32...Motor (Gaishunran <1r, ifu11den Fig. 5 (A
) (puIA4hf -＼；°对ii2I噸!Mlif,ij
- Good hitting J 逼KIshi (Kij Fig. 5 (B) fJ Kamisaki - Word 17 Gourd '7d Fig. 7 P1 Season 94i1's Maimin τ Isato field Fig. 8

Claims (1)

[Claims] A tray that is constantly biased in the cassette insertion direction by a spring, a cassette guide that is attached to this tray so that it can be raised and lowered, and this cassette guide and the base side of the device are connected, and a pin is inserted between them. Two link arms on the left and right that engage with long holes formed on both sides of the tray, a slidable connecting plate that is connected to a pin in the middle of these link arms, and a tray and a connecting plate. worm wheels each having an engaging cam;
a cassette switch that is provided on the back side of the tray and detects the attachment of a cassette and rotates a cam-equipped worm wheel based on the signal; and a home position detector that is activated by the cam-equipped worm wheel and controls its rotation. A mounting mechanism for a magnetic disk cassette, comprising a switch and a mounting completion switch.