JPS5885975A - Carriage driving mechanism - Google Patents

Abstract

PURPOSE:To move accurately a base stage to which a head is fixed, by always expanding a belt of an attaching member with a coil spring. CONSTITUTION:A base stage 45 to which a head 44 is fixed can slide freely with the guide of guide shafts 48r and 48 and driven by a belt 52 stretched between the pulleys 51 and 53. Then the stage 45 is moved along with the belt 52 by the revolution of a step motor 50. The pulley 53 is attached movably to an attachment member 54 and always applied with the tension by a coil spring 5. Thus an assured shift is possible for the stage 45. At the same time, the runaway of a carriage is avoided by a cam projection 51a which touches a stopper 71. Furthermore an operation bar 59a of a microswitch 59 is positioned at the moving path of a guide part 45f. Thus the switch 59 is actuated when the carriage reaches the track 0. As a result, the movement of the carriage is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carriage drive mechanism in a disk drive device, and its purpose is to provide a base to which a head is fixed, which can be moved accurately, has a simple configuration, has a small number of parts,
The purpose is to provide a product with good assembly workability at a low price.

Embodiment 1 of the present invention will be explained below with reference to the drawings.
) is a front plate molded from synthetic resin, and the front plate (1)
K is an elongated opening (4) into which a disk cartridge (2) containing a flexible magnetic disk (3) is inserted, and a door member (5) that restricts the insertion operation of the disk cartridge (2). (7) is a recess provided in the door member (5) where the finger is placed to facilitate opening and closing. , (8) are indicator lamps for displaying the operating status of the flexible magnetic disk drive.

(9) is a chassis formed by punching and bending a metal plate, and the chassis is made up of the chassis (9), the front plate (1), and two side plates (II, aυ) molded from synthetic resin. is forming.

The door member (5) is made of synthetic resin, and as shown in FIG.
The operating portion a is provided with protruding portions α on both sides to moderate the door opening/closing operation. The door member (
5) is formed with an opening αe for accommodating a coil spring αS that biases the coil spring αS, and a protrusion αη for locking one end of the coil spring α$. Ql is a rotating frame formed from a metal plate and attaching the door member (5) and the disk holding member a9, and the cough rotating frame tilt includes a rotating support part (to), an opening Qυ, an arm part @, and a door member storage. The part (c), a pair of holding pieces (to), and (to) and a mounting S (to) for an optical semiconductor element for sector detection are formed (see FIG. 2). The door member storage part (to) can receive the mounting part α of the door member (5), and forms a notch (to) for arranging the coil spring A9. A protrusion (5) is provided in the center to lock the other end of the coil spring aω. The rotating frame (11) is rotatably attached to the 7-palm (9) by a pin, and is held in good condition by lifting the door member (5) side at a certain angle from the chassis surface by a U-shaped spring.

(19 is a disk holding member made of synthetic resin that is rotatably attached to the rotating frame α8. The shape of the disk holding member a9 is as shown in FIG. 5, with slots at approximately equal intervals from the circumference. By providing multiple #I! (To)・
... is formed, and the base arm ■... is made to have sufficient elasticity. The inner wall of the base arm (to) is provided with a protruding part that protrudes toward the center, and the protruding part (c) has a tip mv toward the tip. - The disk holding member α consists of a flat holding surface (toward) that holds the flexible magnetic disk (3), a guide inclined portion 6υ, and a bottom plate portion Q.

The support member (to) is attached to the shaft (to) via a bearing (■). A groove S is formed on the outer periphery of the supporting member, and the disk holding member αj is formed in the groove.
The tips of the protrusions (2)... are engaged, and the support member (to)
A disc holding member Q9 is attached to the disc holding member Q9. And the axis (
Insert the washer and leaf spring (B) into the rotating frame α, and then stop the opposite side with E and shear.
Attach the disk holding member α9 to 8. As shown in Figure 6, the disk cartridge and ejection mechanism are equipped with a movable ejection plate shaped like an abbreviation and a movable ejection plate. M & (The receiver is made of 4 sliding synthetic resin and has a stand lυ and a movable plate for ejection.
It consists of a retaining plate (6) for always holding the movable discharge plate downwards.

The head carriage, which is located approximately in the center of the device, is used for writing and reading.
A movable platform (4?) is attached with a pad (c) that serves to press the flexible magnetic disk (3) onto the disk (c).
) and is formed from. σQ is movable base 44? ) is a spring that always urges the four sides of the base. The base (c) has a guide portion (45a) provided with a guide hole (45a) through which the guide shaft is inserted.
45b) and a mounting part (45d) with a hole (45c) for inserting the bottle (A9) for attaching the movable unit η.
), (45d) are formed. The movable platform Uη has an elongated arm (47a) and a mounting part (c) for attaching it to the base (c).
47b).

The drive source is a stem and a ping motor □ attached to the back side of the carriage drive mechanism. 6
υ is directly W on the rotating shaft (50a) of the steering and ping motor (to)! A belt 6a made of a thin metal plate is hung over the cough pulley 61), and the belt 6a is fixed to the pulley 6υ with a screw. A mounting member (B) K is rotatably mounted, and is used to hang the belt 6a.The mounting member (B) has an abbreviated shape, and is aligned with a hole for movably mounting it on the shaft. A locking part (54J1) is provided to lock one end of the coil spring (to) that urges the pulley in the direction.By the action of the coil spring (to), the endless belt stretched between the pulley 6υ and the pulley □□□ is always under tension and never loosens.The belt has holes,
The protrusion (45e) at the tip of the guide part (45b) of the base (c) is inserted into the hole, and the rotation of the stepping motor group rotates the pulley 6υ and moves the belt 6. Followed by, he, Dokari, Ji moved.

A pair of guide shafts (to) which slidably hold the carriage; r), press the pair of guide shafts -2- downward, and screw (up).

(To) The guide shaft group C is fixed by fixing the presser plate 6'r).

The decoy is fixed.

(to) is a microswitch attached to the chassis (9) so that the operating piece (59m) is positioned within the sliding path of the guide part (45b) of the base (49).- is a flexible magnetic disk (3) This is a DC motor for rotationally driving the rotary plate ευ attached to the drive hub via the drive bell (63).

- is a disk suppressing member formed by bending an elastic metal plate, such as a phosphor bronze plate, and the disk pressing member - is moved by a plunger branch driven by an electromagnetic solenoid. There is an elastic part 1 on the part that presses the disc cartridge that houses the disc cartridge (2). ), for example, by pasting a sponge. The write-inhibit detection mechanism is installed near the side plate αυ.

To explain the opening/closing operation of the door member (5), the door member (5), which is suddenly attached to the rotating frame α, is always urged in the direction of the arrow by the coil spring U51, and the rotating frame is moved by the movement of the U-shaped spring. The u-frame is given a rotational force in the direction of arrow B. The door member (
5) From the open state, when the operating part @ is pushed down in the direction of arrow C against the force of the U-shaped spring, the protruding part α4 of the operating part a moves on the base of the front surface & (1), The door member (5) is a coil spring u! Install it little by little against the force of 19
enters the door member storage area (c) of the rotating frame α. When the protruding part α of the operation part a3 reaches the position of the notch (C) on the back of the front plate (1), the side door member (5) moves in the direction of the arrow by the action of the fill spring, and the protruding part α The movable frame α barrel is held in the t-shape 111 by engaging with the notch. When the operating part α of the door member (5) is lifted upward from the state shown in Fig. 9 ((Rotated)), the protrusion α and the notch (E) are no longer held together, and due to the action of the U-shaped spring. The rotating frame rotates in the direction of arrow B for 1s9.
Return to the state shown in figure (b). By repeating such operations, the door member (5) is opened and closed.

Next, the operation of the flexible magnetic disk ejection mechanism will be explained in detail with reference to FIG. When inserted, the disk cartridge,
) are guided by nine guide grooves on the inner walls of the side plates a and αυ, and the end of the disk cartridge (2) abuts against the bent piece (40b) of the movable discharge plate (Fig. 10). (See fathom).For further movement of the disk cartridge (2),
The movable plate for ejection is moved against the force of the coil spring (see figure jIIO (-)).The movable base for ejection is pulled downward by the coil spring, so the end of the movable plate for ejection is pulled downward by the coil spring. When (40m) reaches the step (41m),
The end (40m) is locked to the stepped part (41a), and the bent piece (4ob) at the other end moves slightly upward and is attached to the rotating frame haze, and the tip of the nine arm part (2) ( 22m) (see Figure 10 (C)). This completes the insertion of the disk cartridge (2), and when the door member (5) is rotated to close the door member (5), the rotating frame or arm S
4 moves, and the tip (22a) of the arm (2) presses down the bent piece (40b) of the movable discharge plate (7), so the end (40m) is moved to the stand IO step part (41m). ), and the movable ejection plate is held in the state shown by the ridges in Figure 10. When the door member (5) is closed, the flexible magnetic disk (3) is driven. Hub lock and disc retaining member (1)
9, and is in a state where it is possible to write or read data.

When the door member (5) is rotated after the data writing or hedding work is completed, the door member (5) becomes closed, and at the same time the rotating frame a barrel also rotates, and the arm moves in the direction of the arrow. Therefore, the distal end (22a) of the arm (2) and the bent piece (40b) of the movable plate for ejection are no longer held together, and the movable temporary ejection position is moved in the direction of arrow E by the action of the coil spring 43 tIK. Move vigorously and eject the disk cartridge (2) from the device.

Next, to explain the flexible magnetic disk holding mechanism in detail, starting from the state where the hole of the flexible magnetic disk (3) is positioned between the disk holding member u3 and the drive nozzle,
When the rotating frame α barrel is rotated, the disk holding member u9 attached to the rotating frame α barrel moves, and the guide inclined portion 6υ of the disk holding member α9 first moves through the hole of the flexible magnetic disk (3). Inside, the disk holding member (19) is inserted while correcting the position of the flexible magnetic disk (3).The recess (Saa) between the disk holding member 19 and the drive hub
Since it is in a positional relationship opposite to the disc holding member α9
is inserted accurately into the recess (63a) of the drive knob. The protrusion in the center of the recess facing the drive knob comes into contact with the center of the bottom plate part (to) of the disc holding member σ9, and as the disc holding member a9 further descends, the center of the bottom plate part (to) is pressed. As a result, the disk holding member (19) deforms within its own elastic range, and deforms so that the % group... is slightly expanded outward.

As shown in Figure 11 et al., the disk holding member α- acts to spread the hole of the flexible magnetic disk (3), and the holding member 1 (to) holds the flexible magnetic disk (3). (3) is pressed against the upper surface (63b) of the drive hub, and the 0Till magnetic disk (3) is held by the disk holding member t1 and the drive hub. The rotation from the DC motor is reliably transmitted to the KtlI:J flexible magnetic disk (3) through the drive hub.

Next, the base (c) with the carrier, ji(he, do) attached.
To explain the driving operation of the movable joint (which consists of a movable joint (with a head and a pad) attached to it, the head is fixed and a base (which is a
C) is slidable using the guide shaft-9 decoy as a guide, 2
belt 15'J stretched between two pulleys 6υ, (53
It is driven by 9. Pulley et al υ The rotating shaft (5 shafts) of the stepping motor (G) is tightly fitted.
The belt transport screwed to the pulley 6υ is moved by the pin motor u21#, and the base is moved together with the bell 63. As mentioned above, in Peltro, one pulley Q is freely attached to the mounting member and tension is constantly applied to it by the coil spring K, so the base (C) can be moved reliably. A cam protrusion (51i) is formed on the pulley 6υ, which abuts against the stopper member σDK, and serves to stop the reed, carry, and jig from running out of control. Refreshingly, the base (ha)
A micro switch operation piece (59a+) is located at one end of the moving path of the other guide part (45f), and when the carriage moves to the 0 track position, the micro switch is activated. It acts to stop the movement of the carriage and the carriage. The carry and position can be moved between the 92nd position and the 35th track position using the ping motor.

Next, we will explain the operation of writing and reading data to and from the flexible magnetic disk (3) using the head mounted on the carrier. Insert the disk cartridge (2) into a predetermined position, close the conch member (5), and hold the flexible magnetic disk (3) in its normal position by the plow IK between the disk holding member a and the drive hub. . Flexible magnetic disk (3)
It is rotated by a DC motor at a speed of 300 revolutions per minute. In this state, the flexible magnetic disk (3) is not yet in contact with the head surface on the base (c) (it is in a slightly close position). Pa.

Although the movable base αη with the disk mounted on it is biased toward the four sides of the base by the spring σQ, the tip of the elongated arm (47a) is locked on the disk suppressing member (goods), so the pad - is in contact with the surface of the oTH magnetic disk (3) and is in a floating state (see @12, c). and,
To, electromagnetic solenoid 4 is energized by the load signal D,
The plunger is attracted and moves the disk suppressing member in the direction of arrow F. When the disk suppressing member moves in the direction of the disk cartridge (2), the movable base 07) moves following this movement.゛Pad attached to movable base 1η
contacts the surface of the flexible magnetic disk (3), causing the flexible magnetic disk (3) to contact the surface of the disk, and at the same time, the elastic member 6η of the disk pressing member presses the disk cartridge,
The flexible magnetic disk (3) is kept in stable contact with the head by lightly pressing the head (2) and lightly pressing the rotating flexible magnetic disk (3). Then, the head K writes and reads data to and from the flexible magnetic disk (3). When the head load signal is input after data writing and reading are completed, the electromagnetic solenoid becomes inactive, the plunger can returns to its original position, and the disk pressing member moves in the direction of arrow G. At the same time, the movable base is lifted and the pad is lifted from the surface of the flexible magnetic disk (31), and the head and the flexible magnetic disk (3) are separated.

As described in the margin below, the carriage drive mechanism of the present invention includes a base on which a head is fixed, which is attached to a pair of guide shafts so as to be movable linearly, and the head is wound around the guide portion of the base between two shafts. The first 7-ri is provided with a cam protrusion that engages with the stopper member, and the second 7-ri is rotatable by a mounting member slidably attached to the guide shaft. The mounting member is always urged in the opposite direction to the 17th direction by a coil spring, so that the belt is always stretched. 1. The belt does not loosen during operation. The rotation of the stepping motor can be accurately transmitted to the base via the belt, increasing the precision of carriage drive, and has a simple structure consisting of two pulleys, a belt, a mounting member, and a coil spring. , the number of parts is small, the assembly workability is good, and an inexpensive disk drive device can be provided, which has significant practical effects.

Margin below

[Brief explanation of drawings]

The drawings all show embodiments of the present invention, and FIG. 1(a) is a front view, and FIG. 2 is a perspective view showing the rotating frame αS.
3 is a top view, FIG. 4 is a bottom view, FIG. 5 is an exploded perspective view showing the disk holding member αl and the drive hub, FIG. 6 is an exploded perspective view of the disk cartridge ejection mechanism, and FIG. 7 8 is an exploded perspective view showing the movable base (rotation) of the base (to).
The figure is a top view showing the carriage drive mechanism, FIG. 9(a),
(b) is a main part explanatory diagram showing the opening and closing operation of the door member (5),
Figure 10 (a), (b), (C) % (d) is an explanatory diagram showing the operation of the disk ejection mechanism, Figure 11 (a), (b)
12(a) and (b) are flexible magnetic disks (3)
FIG. 13 is a cross-sectional side view of a main part showing the state of writing and reading on the base, and FIG. 13 is a rear view of the base and the movable base. (1) Front plate (3) Flexible magnetic disk (2) Disk cartridge (5) Door member (9) Chassis α operation part 0 Mounting part No. 0 Projection part a81ilI moving frame a field
Disk holding member (2) Arm (22m) Front part 4 Door member storage member Arm 4 Projection ■ Holding surface ol Guide inclined part @ Bottom plate member Communication member Shaft Bearing support shaft V) Movable plate for temporary spring discharge ( 40m) Structure (40b) Fold -
- Bud - Movable base (47m) - Long arm - Guide shaft 6υ 1-Lee Stepping motor ■ Bell) Connection 1-Lee (B) mounting member ■ Coil spring - DC motor Connection Drive belt connection Drive hub (63m) Recess - Disk pressure Component - Electromagnetic solenoid Fishing Elastic member @ Protrusion qQ Spring σD Stopper part patent applicant Alps Electric Co., Ltd. Reprint of the drawing (no changes to the content) Figure 5, ρ (b) Figure 5-417 One-hole drawing (Phantom Figure 7 (b) 418- Procedural amendment (method) April 2, 1987, Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 184733 1983, Person making the amendment 4, Order for amendment Date: March 5, 1982 (Delivery date: March 30, 1982) 5. Type engraving (with contents) of the amendment subject to amendment, specification, drawing 6, contents of amendment, application and the entire text of the specification as attached. (No changes) and engrave all drawings as shown in the attached sheet (no changes to self-finishing).

Claims (1)

[Claims] A head is fixed to a base mounted on a pair of guide shafts for linear movement, and a belt wound around two bobbins is connected to the guide portion of the base. A cam protrusion that engages with a member of the stopper is formed on the
The 7-ring of $2 is rotatably supported by a mounting member that is slidably attached to the guide shaft, and the mounting member is always biased in the opposite direction to the 7-ring of $1 by a coil spring. A carriage drive mechanism characterized in that a belt is always stretched by a stepping motor, and a stepper motor drives a first boob to move a base.