JP3485802B2 - Slide member drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for driving a slide member by a rack and a pinion, and uses a magnetic head of a magneto-optical disk drive by utilizing a slide motion of the slide member. The present invention relates to a slide member driving device that can be applied to bring a disk into contact with and separate from the disk. 2. Description of the Related Art FIG. 5 shows a driving device for bringing a magnetic head of a magneto-optical disk device into contact with and separating from a disk. An arm (21) is projected from a slide member (3) slidably mounted on the chassis (1) at a substantially right angle, and the sliding movement of the arm (21) is performed by a motion conversion mechanism (20) by a lever (22). ), The magnetic head (2) at the tip of the lever (20) can be brought into contact with or separated from the disk (not shown). A rack (31) is formed on the slide member (3), and a pinion gear (56) meshed with the rack (31) is rotationally driven by a motor (4) via a gear transmission means (5). The protruding piece (3) protruding from the extension (32) of the slide member (3)
On the transition path of (6), two switches (6) and (7) are provided, and the forward end and the backward end of the slide member (3), that is, the magnetic head
The motor (4) is stopped by detecting the lowermost and uppermost ends of (2). The switches (6) and (7) detect the forward or backward end of the slide member (3),
Even if (4) attempts to stop, for example, by shaking the magneto-optical disk device by hand, the motor is attached to the slide member (3).
A force against the stop of (4) acts, and a large load may be applied to the gear transmission means (5). Since the worm gear (55) is interposed in the gear transmission means (5), the load is applied, so that the worm (53) and the helical gear (54) bite into each other, and the motor (4) Stops working. Exactly O
If a stepping motor capable of N-OFF control is used, the above problem can be solved, but the cost of the motor increases. According to the present invention, a relief portion is provided on both outer sides of the rack to be disengaged from the pinion gear, thereby preventing the worm gear from biting even if a force against the motor stop acts on the slide member. An object of the present invention is to clarify a drive device for a slide member that can avoid a situation in which rotation is impossible. [0005] A slide drive device according to the present invention comprises:
Pinion via gear transmission means (5) including worm gear (55)
The motor (4) is linked to the on-gear (56), and the slide member (3)
Mesh with the pinion gear (56)
The slide member (3) is slid and driven,
The forward end and the backward end of (3) are respectively operated by switches (6) and (7).
A slide member drive device that detects and stops the motor (4)
In this case, the rack (31) is provided with the forward end of the slide member (3) and the rack (31).
The retracted end corresponds to the position detected by the switches (6) and (7).
It is formed to a length that disengages with the nonion gear (56), and
The guide member (3) has a notch (33) and both ends of the rack (31).
Escape parts (30) and (30) for opening the pinion gear (56)
The notch (33) is provided at the forward end of the slide member (3).
Then, the slide member (3) is pushed backward by the rear end of the notch (33).
The rack (31) meshes with the pinion gear (56)
At the retracted end of the slide member (3),
The front end of 3) pushes the slide member (3) forward.
To allow the rack (31) to mesh with the pinion gear (56)
A spring (81) that plays a role is fitted. At the forward end and the backward end of the slide member (3), that is, at the position where the switches (6) and (7) are operated, the pinion gear (56) enters the relief portion (30), Racks (3
Disengagement with 1). Therefore, for example, even if a force against the stop of the motor (4) acts on the slide member (3) by shaking the magneto-optical disk device by hand, the gear transmission means
It does not affect (5). Therefore, the gear transmission means
A large load acts on the worm gear (55) interposed in (5), and the worm (53) of the worm gear (55) and the helical gear (5)
It is possible to avoid a situation in which the motor (4) becomes unrotatable due to biting of the motor (4). Since the slide member (3) is spring-biased to the opposite side at the forward end and the reverse end, respectively, the next time the motor (4) starts, it smoothly meshes with the rack (31), The slide member (3) can be slid smoothly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a driving device for contacting and separating a magnetic head of a magneto-optical disk drive from a disk. FIGS. 1, 3 and 4 are plan views of the mechanism, but the parts where the mechanism overlaps are all represented by solid lines without distinction of the vertical relationship. A slide member (3) is provided on the chassis (1) so as to be slidable in directions indicated by arrows A and B. The maximum slidable stroke of the slide member (3) is slightly larger than the length of the detection pieces (61) and (71) of the switches (6) and (7) described later. In the following description, the front is the side indicated by arrow A, and the rear is the side indicated by arrow B. [0010] An arm (21) is connected to the rear end of the slide member (3), and the tip of the arm (21) is connected to the motion conversion mechanism (20). The motion conversion mechanism (20) converts the sliding motion of the arm (21) into the vertical motion of the lever (22), and
2) The head (2) at the tip is brought into contact with and separated from the disk. A rack (31) is formed on the slide member (3), and the rack (3) is formed.
The pinion gear (56) meshes with 1). The effective length of the rack (31) corresponds to the required stroke of the magnetic head (2), and relief portions (30) (30) are formed on both outer sides of the rack (31) so that the pinion gear (56) can idle. Have been. The slide member (3) is slid by a motor (4) via a gear transmission means (5). In the gear transmission means (5), a large gear (52) meshes with a drive gear (51) on a motor shaft, and a helical gear (54) meshes with a worm (53) coaxial with the large gear (52). The pinion gear (56) is provided coaxially with the helical gear (54). Worm (53) and helical gear
The worm gear (55) is constituted by (54). The distal end of the slide member (3) is extended forward, and a projecting piece (36) is projected from the extension (32). Along the transition path of the projecting piece (36), the forward end and the backward end of the slide member (3), that is,
The switches (6) and (7) correspond to the lowermost end of the magnetic head (2) sliding on the disk and the uppermost end of the magnetic head (2) separated from the disk.
Is deployed. As shown in FIG. 3, when the arm (21) reaches the forward end, that is, when the magnetic head (2) reaches the front lower end, the protruding piece (36) is set to the detecting piece of the front switch (6). By pressing the switch (61), the switch is operated to cut off the power supply circuit of the motor (4). At this time, the pinion gear (56) is disengaged from the rack (31) and located at the rear escape portion (30). As shown in FIG. 4, when the magnetic head (2) reaches the retreat end, the protruding piece (36) moves to the detecting piece (7) of the rear switch (7).
By pressing 1), the switch is operated to cut off the energizing circuit of the motor (4). At this time, the pinion gear (56) is
It is located at the escape part (30) in front of it, deviating from 1). The slide member (3) has the relief portions (30) (3)
A spring (8) working in the direction of meshing the rack (31) with the pinion gear (56) located at position (0) is connected. The spring (8) of the embodiment is a leaf spring (81), and is provided with the base end fixed on the chassis (1) along with the switch (7). The leaf spring
The free end of (81) fits into a notch (33) opened in the front extension (32) of the slide member (3). The length of the notch (33) in the front-rear direction is slightly shorter than the effective length of the rack (31) of the slide member (3). As shown in FIG. 3, the leaf spring (81) is a slide member.
At the forward position of (3), the rear end edge (35) of the notch (33) is pushed slightly to bend forward, and as shown in FIG.
In the retracted position of the notch (33), it is pushed by the front edge (34) of the notch (33) and slightly bent backward. When the motor (4) rotates, the slide member (3) advances, and as shown in FIG. 3, the protruding piece (36) on the slide member (3) is moved to the front switch (6) at the advance end. Is pressed, the energizing circuit of the motor (4) is cut off. At this time, since the pinion gear (56) is disengaged from the rack (31) and located at the rear escape portion (30), a force against the rotation stop of the motor (4) acts on the slide member (3) for some reason. This does not affect the gear transmission means (5).
Accordingly, the worm gear 55 does not bite due to a large load acting on the gear transmission means 5, and the motor 4 does not rotate. At the forward end of the slide member (3), a spring (8)
Abuts against the rear edge (35) of the notch (33) of the slide member (3) to urge the slide member (3) rearward, so that the next time the motor (4) rotates reversely, the pinion gear (56) smoothly meshes with the rack (31), and can slide the slide member (3) smoothly. The slide member (3) is retracted, as shown in FIG.
When the projecting piece (36) on the slide member (3) presses the detecting piece (71) of the rear switch (7) at the retreat end, the energizing circuit of the motor (4) is cut off. At this time, the pinion gear (56)
Since the gear (31) is located at the front escape portion (30) and is disengaged from the rack (31), even if a force against the rotation stop of the motor (4) may be applied, the gear transmission means A large load does not act on (5). Therefore, the motor (4) does not become unable to rotate due to the biting phenomenon of the worm gear (55). At the retracted end of the slide member (3), a spring (8)
Abuts against the front edge (34) of the notch (33) of the slide member (3) to urge the slide member (3) backward, so that when the motor (4) next rotates, the pinion gear (56) ) Can smoothly mesh with the rack (31), and can slide the slide member (3) smoothly. In practicing the present invention, a leaf spring for urging the slide member (3) is fixed to the slide member (3) at its base end, and is adapted to the chassis (1) corresponding to the stroke of the slide member (3). Pieces (not shown) are provided at two places, and the slide member (3) can be urged by applying the tip of the leaf spring to the corresponding piece. Further, the spring (8) is not limited to the above, and the slide member (3) is moved at its forward end and its backward end.
As long as the rack (31) can be urged in the direction in which it meshes with the pinion gear (56), the type of spring and the mounting position are not limited. Further, the present invention is not limited to the slide drive device for the magnetic head (2) of the disk recording device described above, but can be implemented as long as it is a device that slides a slide member between two positions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a slide drive mechanism of a magnetic head of a disk recording / reproducing apparatus. FIG. 2 is a perspective view of a gear transmission unit that slides and drives a slide member. FIG. 3 is a plan view of a main part in which a slide member has moved to a forward end; FIG. 4 is a plan view of a main part in which a slide member has moved to a retreat end; FIG. 5 is a plan view of a main part of a conventional example. [Description of Signs] (1) Chassis (3) Slide member (30) Relief portion (31) Rack (4) Motor (5) Gear transmission means (53) Worm (54) Helical gear (55) Worm gear (6) ) Switch (7) Switch (8) Spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-250821 (JP, A) JP-A-4-362580 (JP, A) JP-A-2-122481 (JP, A) JP-A-9-99 7269 (JP, A) JP-A-8-115573 (JP, A) JP-A-5-250820 (JP, A) Jpn. ⁷ , DB name) F16H 19/00-37/16 G11B 21/00-21/06 G05D 3/00-3/20

Claims (1)

(57) [Claim 1] Gear transmission means including a worm gear (55)
The motor (4) is connected to the pinion gear (56) via (5),
The rack (31) formed on the slide member (3) is
A) The slide member (3) is driven to slide by meshing with the
Then, the forward end and the backward end of the slide member (3) are respectively switched.
(6) Slider that stops motor (4) detected by (7)
In the sliding member driving device, the rack (31)
Switches (6) and (7) detect the forward and backward ends of (3)
Length of disengagement with pinion gear (56) corresponding to position
The slide member (3) has a notch (33) and a
Relief part to allow pinion gear (56) to escape outside both ends of hook (31)
(30) and (30) are opened, and a slide member is provided in the notch (33).
At the forward end of (3), it is pushed by the rear end of the
The rack member (31) and the pinion are urged in the backward direction
The gear (56) can be meshed, and the slide member (3) is retracted.
At, the slide member (3) is pushed by the front end of the notch (33).
By urging in the forward direction, the rack (31) and the pinion gear (56)
A spring (81)
Ride member drive.