JPH04128072A - Carriage transfer speed change-over mechanism - Google Patents

Abstract

PURPOSE:To correspond to high speed processing and to accurately position a carriage by moving both transmission plates by a drive means so that either one of the transmission plates is engaged with the corresponding lead screw. CONSTITUTION:A stepping motor 7 is driven in a predetermined direction by a control signal to rotate a lead screw 6 and a carriage 1 wherein a transmission plate 10A is engaged with a screw groove 9A is transferred at high speed according to the large pitch of the screw groove 9A by the rotation of the screw 6. When the carriage 1 reaches the vicinity of a predetermined stop position, a solenoid 17 is de-energized by the control signal from a control means and a rotary plate 14 is revolved by the action of a coil spring 16 and the transmission plate 10A is released from the engagement with the screw groove 9a and a transmission plate 10B is engaged with a screw groove 9B. Thereafter, the rotation of the lead screw 6 is transmitted to the carriage 1 according to the screw groove 9B having a small pitch by the stepping motor 7 to transfer the carriage 1 at low speed.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a μ-carriage transfer speed switching mechanism, and particularly relates to a μ-carriage transfer speed switching mechanism in which a head for storing or reading information from a storage medium is used in a storage device such as an optical disk. The present invention relates to a carriage transfer speed switching mechanism for switching the transfer speed for seeking or the like of a carriage mounted for radial transfer into two levels, high and low.

[Conventional technology]

Generally, in a storage device, a carriage carrying a head is moved by rotating a lead screw screwed into the carriage by a motor.

[Problem to be solved by the invention]

By the way, if the rotation speed of the motor is constant, reducing the pitch of the threaded part formed on the lead screw will slow down the carriage transfer speed, so it is possible to maintain good positioning accuracy of the head mounted on the carriage. However, this may become a bottleneck when attempting to perform high-speed processing in a storage device.

On the other hand, if the threaded part formed on the lead screw is made larger, the carriage transfer speed will become faster.
Although it is possible to handle high-speed processing by moving the carriage at high speed, there is a problem in that the head positioning accuracy decreases.

In view of these points, the present invention can support high-speed processing,
Moreover, the carriage transfer speed can be switched to accurately position the carriage! The purpose is to provide a structure.

[Means to solve the problem]

In order to achieve the above-mentioned object, the carriage transfer speed switching mechanism according to claim 1 of the present invention has a lead screw driven by a motor screwed onto the carriage, and the lead screw is driven by the motor to transfer the carriage. In the lead screw, two types of threaded portions with different pitches are formed, and a transmission plate that can engage with one threaded portion and another transmission plate that can engage with the other threaded portion are movable on the carriage. The present invention is characterized in that it is provided with a driving means for moving both transmission plates synchronously so that only one of the transmission plates selectively engages with the corresponding threaded portion.

Further, the carriage transfer speed switching mechanism according to claim 2 includes:
According to the first aspect of the present invention, the two types of threaded portions are formed at intervals in the axial direction of the lead screw.

Furthermore, the carriage transfer speed switching Il of claim 3!
In claim 1, the structure is defined as the above-mentioned 21! ! The present invention is characterized in that similar threaded portions are formed in a mixed manner at substantially the same location in the axial direction of the lead screw.

Furthermore, in the carriage transfer speed switching mechanism according to claim 4, a lead screw driven by a motor is screwed into the carriage, and the lead screw is driven by the motor to transfer the carriage. It is characterized by providing a driving means for integrally moving the entire screw and carriage in the axial direction of the lead screw.

[For production]

Claims 1 to 3 of the present invention having the above-described structure
According to the carriage transfer speed switching mechanism described in Section 2, both transmission plates can be moved by the driving means so that either one of the transfer plates engages with the corresponding lead screw, so it is possible to change the distance by which the carriage is transferred. Accordingly, if the distance is large, the carriage should first be transferred at high speed for most of the transfer distance, and when it approaches the stop position, the drive means will switch the transmission plate that is threaded onto the corresponding lead screw to transfer the carriage at low speed. Accordingly, the carriage can be accurately stopped at a predetermined stop position.

On the other hand, if the distance to transport the carriage is short, it is sufficient to transport the carriage at a low speed from beginning to end.

According to the carriage transfer speed switching mechanism of claim 4 of the present invention, if the carriage transfer distance is long, the motor, lead screw, and the entire carriage are first controlled by the drive means to match the carriage transfer distance. When the carriage has been transported over most of the area and approaches the stop position, the drive by the driving means is stopped and the lead screw is rotationally driven by the motor, thereby making it possible to accurately stop the carriage at a predetermined stop position.

On the other hand, if the distance to transport the carriage is short, the carriage may be transported at low speed by rotating the lead screw with a motor from beginning to end.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

1 to 4 show a first embodiment of a carriage transfer speed switching mechanism according to the present invention, and a carriage 1 on which a head (not shown) is mounted has a substantially flat plate shape. A guide shaft 2 extending in the transport direction of the carriage 1 is disposed on one side of the carriage 1, with both ends supported by a fixed plate 3.3 on a substrate (not shown). A pair of bearings 4.4 formed on the carriage 1 are slidably fitted onto the shaft 2.

A bearing 5 is provided on the other side of the carriage 1 for rotation.
A lead screw 6 is disposed which is supported by and extends parallel to the guide shaft 2, and a step motor 7 for rotationally driving the lead screw 6 is connected to one end of the lead screw 6. The lead screw 6 is formed with two types of threaded portions 8A and 8B having different pitches at intervals in the axial direction, and among these threaded portions 8A, as shown in FIG. A pair of thread grooves 9A, 9A with a larger pitch than the part 8B are formed in duplicate, and a single thread groove 9B with a small pitch is formed in the thread part 8B, as shown in FIG. ing. The pitch ratio of these thread grooves 9A and 9B is approximately 2=1. Note that the reason why a pair of screws 19A and 9A are formed in the threaded portion 8A is so that the transmission plate 10A, which will be described later, can quickly engage (screw together) with either of the screws It9A and 9A. be.

The transmission plate 10A has one of the thread grooves 9A.

It has an arc shape that can be engaged with 9A from below,
One end thereof is pivotally attached to the carriage 1 so as to be swingable. Further, a transmission plate 10B having an arcuate shape that can be engaged with the screw plate 9B from below is pivotably attached to the carriage 1 at one end thereof. Therefore, these transmission plates 10A or 10B have thread grooves 9A or 9B.
When the lead screw 6 is driven to rotate while engaged with the guide shaft 2, the carriage 1 is moved along the guide shaft 2.

Below each threaded portion 8A, 8B of the lead screw 6, the threaded groove 9A, 9B of the transmission plate 10A, IOB.
A push plate 11 for engaging and releasing the
A and 11B are arranged. Each push plate 11A, 11B
are each formed into a chamfered flat plate shape extending in the axial direction of the lead screw 6, and each pushing plate 11A,
The edges of the transmission plates 11B push up the transmission plates 10A and 10B from below to engage the transmission plates 10A and 10B with the screw grooves 9A and 9B.

As shown in FIGS. 4A and 4B, both the pushing plates 11A and 11B are connected by a rotating shaft 12 such that their respective planes are shifted in the vertical plane in the horizontal direction, and one of the pushing plates Only one transmission plate 11A or 11B selectively pushes up one transmission plate 10A or 10B, and one screw thread 9A
or 98 can be selectively engaged. Further, the free end of the − side pushing plate 11A is provided with the rotating shaft 12.
Another rotating shaft 13 coaxial with the rotating shaft 13 is provided protrudingly, and a flat rotating plate 14 is attached to this rotating shaft 13.

The other end of a return coil spring 16 whose one end is supported by a support plate 15 is connected to this rotary plate 14, and when this coil spring 16 is in a free state, as shown in FIG.
As shown in , only one pushing plate 11B stands up to engage the transmission plate 10B with the thread groove 9B, and at this time, the other pushing plate 11A is in a slightly inclined state and moves the transmission plate 10A into the thread groove 9A. (Figure 3A,
8). Furthermore, the rotary plate 14 includes a solenoid 1.
The solenoid 17 is energized to shorten the plunger 18 and move the rotating plate 14 against the coil spring 16 as shown in FIG. 4B.
From the state shown in FIG. 4A, it is rotated counterclockwise and positioned to the state shown in FIG. 4A. In this state,
Only one pushing plate 11A stands up to engage the transmission plate 10A with the thread groove 9A, and at this time, the other pushing plate 11B is slightly tilted so as to separate the transmission plate 10B from the thread groove 9B. (See Figure 3 C and D).

Note that the step motor 7 and solenoid 17 are
It is electrically connected to a control means (not shown) of the storage device, and is driven by a control signal from the control means.

Next, the operation of this embodiment having the above-described configuration will be explained.

When the solenoid 17 is not energized, the rotating plate 14 is in the state shown in FIG. When the transport distance of the carriage 1 is large, the solenoid 17 is energized by the control signal from the control means, and the solenoid 17 causes the rotary plate 14 to move counterclockwise in FIG. 4B against the coil spring 16. It is rotated and assumes the state shown in FIG. 4A.

In this state, the transmission plate 10A is pushed up so as to engage with one of the screws 1119A by the pushing plate 11A which is in the upright state, and on the other hand, the transmission plate 10A is pushed up by the pushing plate 11B which is in the tilted state from the upright state. 10B is disengaged from the thread groove 9B. In addition, the transmission plate 10A has the thread groove 9A.
Since the thread grooves 9A are double formed, even if the pitch of the thread grooves 9A is large, one of the thread grooves 9
A can be easily engaged.

Thereafter, the step motor 7 is driven in a predetermined direction by a control signal from the control means to rotate the lead screw 6, whereby the carriage 1, in which the transmission plate 10A is engaged with the thread groove 9A, It will be transported at high speed according to the large pitch. Then, when the carriage 1 reaches the vicinity of the predetermined stop position,! IJ! The solenoid 17 is deenergized by the 11111 signal from the means a,
Due to the action of the coil spring 16, the rotary plate 14 is rotated as shown in FIG. 4A to FIG. 9B. As a result, thereafter, the rotation of the lead screw 6 by the step motor 7 is transmitted to the carriage 1 along the small pitch thread groove 9B, and the carriage 1 is transported at a low speed. Therefore, the carriage 1 can be accurately stopped at a predetermined stop position.

On the other hand, if the transport distance of the carriage 1 is small, the solenoid 17 need not be energized from the beginning. In this state, as shown in FIG. 4B, the transmission plate 1 is inserted into the thread groove 9B.
Since 0B is engaged, the rotation of the lead screw 6 by the step motor 7 is transmitted to the carriage 1 according to the small pitch thread groove 9B, and the carriage 1 is transported at a low speed. Therefore, in this case as well, the carriage 1 can be accurately stopped at a predetermined stop position.

As described above, according to this embodiment, when the transport distance of the carriage 1 is long, the carriage 1 is first transported at a high speed, and then the carriage 1 is transported at a low speed from near the stop position, thereby achieving high-speed processing. Moreover, it is possible to accurately stop at a predetermined stopping position. In addition, when the transport distance of the carriage 1 is small, by transporting the carriage 1 at low speed from the beginning to the end,
It is possible to accurately stop at a predetermined stopping position.

5 to 7 show a second embodiment of the carriage transfer speed switching mechanism according to the present invention, and this second embodiment will be described below. The same reference numerals are used in the drawings to designate the same or corresponding configurations as those in the first embodiment described above, and only the main parts thereof will be described.

The lead screw 6 shown in FIG. 6 has a thread groove 9A with a large pitch and a thread groove 9B with a small pitch, which are formed so as to coexist in almost the same area and intersect with each other.
Among these, the screw 19A with a large pitch has a shallow depth, and the screw groove 9B with a small pitch has a deep depth.

On the other hand, the carriage 1 on which the head is mounted has a third transmission member 19 projecting from the side facing the lead screw 6, and this transmission member 19 is supported by the carriage 1 so as to be able to move up and down. base 20 and this base 2
The overall configuration is made up of two transmission plates 10A and IOB that protrude from the lower and upper parts of the lead screw 6 so as to face above and below the lead screw 6, respectively. Of these, the transmission plate 10A is formed in a shape that can be engaged (screwed) only with the shallow thread groove 9A from the lower side of the lead screw 6, and the transmission plate 10B is It is formed in a shape that can engage only the deep thread groove 9B from the upper side of the screw 6. The spacing between these transmission plates 10A and 10B is set to be somewhat larger than the outer diameter of the lead screw 6, and as the transmission member 19 moves up and down with respect to the carriage 1, either of the transmission plates 10A or 10B moves. It can be engaged with either the thread groove 9A or 9B of the lead screw 6.

In the vicinity of the transmission member 19, as shown in FIGS. 7A and 7B, a pair of identical spur gears 21A and 21B that are vertically spaced apart and mesh with each other are arranged. gear 2
The engagement position of 1A and 21B is approximately equal to the axis of the lead screw 6 in the vertical direction. Each spur gear 21A.

Pushing plates 11A and 11B that can contact the transmission plates 10A and 10B from the back are located at the center of the spur gear 21A.
, 21B, and these pushing plates 11A, 11B are connected to the gears 21A, 21B.
As B rotates, only one of the pushing plates 11A or 11B is positioned in the vertical direction, and the other pushing plate 11B or 11A is slightly inclined to the vertical direction.

A push plate 11A located below the transmission member 19
is oriented in the vertical direction, the transmission plate 10A pushed from below by the pushing plate 11A engages the thread groove 9A of the lead screw 6.
When the pushing plate 11B, which is engaged from below and located above the transmission member 19, faces in the vertical direction, this pushing plate 11
The transmission plate 10B pushed from above by B engages with the thread groove 9B of the lead screw 6 from above.

A protrusion 22 protruding outward is provided on the outer periphery of the lower part of the spur gear 21A, and a plunger 18 of the solenoid 17 is connected to this protrusion 22. Further, one end of a coil spring 16 for return is attached to the projection 22. When the solenoid 17 is not energized, the upper transmission plate 10B of the transmission member 19 is oriented vertically as shown in FIG. I! On the other hand, when the solenoid 17 is energized, the lower transmission plate 10A of the transmission member 19 is oriented vertically, and the transmission plate 10A is pitched vertically. large screw groove 9
It is designed to engage with A.

According to the above-described configuration, by energizing the solenoid 17, the transmission plate 10A of the transmission member 19 engages with the large pitch thread groove 98 of the lead screw 6, and the carriage 1
can be transferred at high speed, so when the transfer distance of the carriage 1 is long, the solenoid 17 is first energized to transfer the carriage 1 at high speed, and then near the stop position, the solenoid 17 is deenergized to transfer the transmission member 19. transmission plate 10
By engaging B with the small pitch thread groove 9B of the lead screw 6 and transporting the carriage 1 at low speed, the carriage 1 can be accurately stopped at a predetermined stop position.

FIG. 8 shows a third embodiment of the carriage transfer speed switching mechanism according to the present invention, and this third embodiment will be described below. Note that the same or corresponding configurations as those of the first embodiment described above are designated by the same reference numerals in the drawings, and only the essential parts thereof will be described.

In FIG. 8, the lead screw 6 has only one threaded groove 9B with a small pitch, but in this embodiment, the lead screw 6 is rotatably driven by a step motor 7. Lead screw 6 and
A bearing 5 that rotatably supports this lead screw 6 can be moved in the same direction as the step motor.
Also, on the side of the bearing 5 and the step motor 7, there is a
A guide rail 23 is provided to guide the transfer of the materials. The step motor 7 is provided with 11 plunges v18 of the solenoid 17, and when this 5-lenoid 17 is energized, the bearing 5, lead screw 6, and step motor 7 approach the solenoid 17 together with the carriage 1. It will be transferred in the direction. Furthermore, when the solenoid 17 is deenergized, the bearing 5
, a coil spring 16 is connected that biases the lead screw 6 and the step motor 7 together with the carriage 1 in a direction away from the solenoid 17.

According to the above-described configuration, when the transport distance of the carriage 1 is larger than the stroke of the plunger 18 in the solenoid 17, the solenoid 17 is energized or deenergized to move the carriage 1 to the bearing 5,
Together with the lead screw 6 and the step motor 7, the carriage 1 is instantaneously moved toward or away from the solenoid 17 at high speed, and then the step motor 7 is driven to move the carriage 1 to the bearing 5, the lead screw 6, and the step motor 7. By moving the carriage 1 at a low speed by itself, the carriage 1 can be accurately stopped at a predetermined stopping position.

In this way, this embodiment can also achieve the same effects as the first and second embodiments described above.

Note that the present invention is not limited to the embodiments described above, and various changes can be made as necessary. for example,
The carriage is not limited to a storage device.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to cope with high-speed processing, and moreover, the excellent effects of being able to accurately position the carriage are achieved.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the carriage transfer speed switching mechanism according to the present invention, in which FIG. 1 is a schematic plan view of the entire structure, and FIGS. Perspective views showing the condition of the grooves, Figure 3 A, B, C, D
is an explanatory diagram showing the action of the transmission plate by the pushing plate, FIG. 4A,
B is an explanatory diagram showing the action of the solenoid, Figures 5 to 7.
The drawings show a second embodiment of the present invention, and FIG. 5 is a schematic plan view of the whole, FIGS. 6A and B are similar to FIGS. 2A and B, and FIGS. 7A and B are FIGS. 8A and 8B are explanatory diagrams showing the action of the solenoid, and FIGS. 8A and 8B are explanatory diagrams of the action showing the third embodiment of the present invention. 1... Carriage, 6... Lead screw 7.
...Step motor, 9A, 9B...Thread groove, 10A
. 10B...Transmission plate, 11A, 11B...Press plate, 1
4... Rotating plate, 16... Coil spring, 17... Solenoid 18... Plunger, 19... Transmission member,
21A. 21B...Spur gear, 22...Protrusion, 23...Guide rail. Applicant's agent Shunsuke Nakao Figure 4 (A) (B) Figure 5 Figure 6 (B)

Claims (1)

[Claims] 1) A lead screw driven by a motor is screwed onto the carriage, and the lead screw is driven by the motor to transport the carriage, in which the lead screw has two types of threaded portions with different pitches. and movably supports a transmission plate that can be engaged with one threaded part and another transmission plate that can be engaged with the other threaded part, and only one of the transmission plates selectively corresponds to the screw. 1. A carriage transfer speed switching mechanism characterized in that a drive means is provided for synchronously moving both transmission plates so as to engage with the carriage transfer speed switching mechanism. 2) The carriage transfer speed switching mechanism according to claim 1, wherein the two types of threaded portions are formed at intervals in the axial direction of the lead screw. 3) The carriage transfer speed switching mechanism according to claim 1, wherein the two types of threaded portions are formed in a mixed manner at substantially the same location in the axial direction of the lead screw. 4) A lead screw driven by a motor is screwed onto the carriage, and the lead screw is driven by the motor to transport the carriage, and the motor, the lead screw, and the carriage are all integrated in the axial direction of the lead screw. 1. A carriage transfer speed switching mechanism, characterized in that a carriage transfer speed switching mechanism is provided with a drive means for moving the carriage.