JPH09236162A - Table feed mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent floating of a pin, prevent occurrence of a gap, and improve feed precision by providing a separation preventing member to form a regulation screw and an engaging part to form a pin engaged with a screw groove. SOLUTION: A slide table 3 guided by a guide shaft 2 is moved through rotation of a feed screw shaft 4 arranged in parallel to a guide shaft 2. A screw groove 5 is formed in the feed screw shaft 4, and an engaging part engaged with a pin 7 engaged with the screw groove 5 is mounted on a slide table 3. The engaging part is attached at the end part of the slide table 3 side in such a state that the pin 7 is inserted in a circular holding piece 8 arranged at the tip part of the pin support plate 6 in a state to be registered with the screw groove 5. An adjustment screw 11 is arranged at the slide table 3 and locked by a lock nut 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table feed mechanism, such as an XY table, which is capable of accurately moving a linearly moving moving member in a predetermined direction.

[0002]

2. Description of the Related Art As a moving means for linearly and accurately moving a moving member, there is a head carriage moving mechanism used in a recording apparatus for recording and reproducing, for example, using a magnetic disk as a recording medium. In order to perform recording and reproduction on a floppy disk as a recording medium, it is necessary to move the head carriage with high precision. Conventional moving means for moving the head carriage include, for example, those shown in FIGS. 5 and 6, FIG. 5 being a cross-sectional view of the driving portion, and FIG. 6 being a longitudinal cross-section of the driving portion and the head carriage portion. In the drawings, each circled portion is an enlarged view of the main part in the upper direction of the arrow. In FIGS. 5 and 6, 38 is
A head support for supporting a magnetic head (not shown) is always elastically urged so that its tip end portion tends to move toward the tip end side of the carriage 31. Reference numeral 40 denotes a guide shaft that guides the movement of the head support 38, and the head support 38 is movable to the guide shaft 40 by inserting the guide shaft 40 into a guide hole 34 formed in the carriage 31. And is guided by the guide shaft 40 in the moving direction.

Reference numeral 30 denotes an engaging pin formed so as to horizontally project from the side surface of the carriage 31, and the engaging pin 30 is
Screw groove 3 formed on the feed screw shaft 35 of the motor shaft 33
6 is engaged with a portion located on the side facing the chassis 39. The engaging pin 30 is the thread groove 3 of the feed screw shaft 35.
In the state of being engaged with 6, the tip end of the leaf spring 37 whose base end is fixed to the carriage 31 by fixing means such as screws is elastically contacted with the portion of the feed screw shaft 35 located on the side opposite to the chassis 39. Is held by being. That is, the engaging pin 30 is elastically engaged with the screw groove 36 of the feed screw shaft 35 from below by the upward elastic force of the carriage 31 biased by the elastic force of the leaf spring 37. There is. Explaining the operation in the above configuration, the motor shaft 33 is finely step-driven at every predetermined rotation angle, the motor shaft 33 is rotated in a predetermined direction, and the engagement pin 30 is moved in the axial direction of the motor shaft 33. The head support 38 can move in the direction indicated by the arrow.

However, as the moving means for moving these conventional head carriages, the load on the moving member must be light, and when a desired load needs to be applied,
Depending on the degree of load, there are problems that the pin 30 is lifted from the feed screw shaft 35, the pin 30 is detached from the feed screw shaft 35, and the life of the feed mechanism is shortened. Further, in the feeding mechanism relating to the above-mentioned moving means, it is not possible to adjust the pressurizing force and the clearance between the pin 30 and the screw groove 36, and further, it is limited to the application range of a light load such as its own weight. Was there.

The present invention has been made in view of the above circumstances, and it is possible to prevent the pins from rising and coming off and improve the accuracy, and to apply a slight pressurizing force to feed the table with good accuracy. The purpose is to allow a minute gap and adjust the gap between the pin and the screw groove so that the table can be moved lightly.

[Means for Solving the Problem] In order to achieve the object, the invention according to claim 1 is a feed screw shaft in which a slide table guided by a guide shaft is provided in parallel with the guide shaft. In a table feeding mechanism configured to move by rotation, an engaging member having an engaging portion that engages with a screw groove of the feed screw shaft is attached to the slide table, and the engaging portion is separated from the screw groove. It is characterized in that a disengagement prevention member is provided to prevent such a phenomenon.

According to a second aspect of the present invention, the engaging portion that engages with the screw groove is a pin member, and the separation preventing member adjusts the engagement state of the pin member with the screw groove. It is an adjustment screw.

According to a third aspect of the present invention, the first slide table guided by the first guide shaft is rotated in the first direction by rotation of the first feed screw shaft provided in parallel with the first guide shaft. And a second guide shaft orthogonal to the first guide shaft is provided on the first slide table, and a second slide table is provided on the second guide shaft in parallel with the second guide shaft. A table feed mechanism configured to move along the second guide shaft by rotation of the feed screw shaft, wherein an engaging portion that engages with the thread grooves of the first and second feed screw shafts is provided. The engaging members are attached to the first and second slide tables, respectively, and the first and second detachment preventing members that prevent the engaging portions from detaching from the respective thread grooves are provided. Characterizing

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a table feed mechanism of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a side sectional view showing an embodiment of a table feed mechanism according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of FIG. 1 seen from the right side, and FIG. It is a sectional view of the important section concerning other examples.

The table feeding mechanism according to the present invention is shown in FIG.
Further, as shown in FIG. 2, 2 is a guide shaft for guiding the movement of the moving member, and the moving member is placed on the slide table 3. A feed screw shaft 4 provided with a slide table 3 guided by the guide shaft 2 in parallel with the guide shaft 2.
It is configured to be moved by the rotation of. A screw groove 5 is formed on the feed screw shaft 4, and an engaging portion for engaging the pin 7 with the screw groove 5 is attached to the slide table 3. In the engaging portion, the pin 7 is inserted into the hole 9 of the circular holding piece 8 provided at the tip of the pin supporting plate 6 formed of the biasing member on the side of the feed screw shaft 4 according to the position of the screw groove 5. And is attached to the end on the slide table 3 side with a screw 10.

The slide table 3 is provided with an adjusting screw 11 which is embedded in the slide table 3 for adjusting a clearance between the pin 7 and the screw groove 5 and adjusting an engagement state with the screw groove 5. The adjusting screw 11 is locked by an adhesive after the height position of the pin 7 is adjusted by the lock nut 12. A motor 1 for driving the feed screw shaft 4 is attached to an end portion of the frame 13, and a pivot bearing 14 for supporting the feed screw shaft 4 is provided at a tip end portion on the other end side of the feed screw shaft 4. A pivot bearing column 15 is attached to the frame 13 on the side opposite to the motor. Also, on the slide table 3,
A mounting hole 16 for mounting and fixing the moving member is provided.

In the above structure, when the motor 1 is step-driven, the feed screw shaft 4 is rotated in a predetermined direction, and the pin 7 moves along the axial direction of the feed screw shaft 4, thus supporting the pin. The slide table 3 can be moved via the plate 6.

The feature of the present invention resides in the detachment prevention member forming the adjusting screw 11 and the engaging portion forming the pin 7 engaging with the screw groove 5. The adjusting screw 11 is a pin support plate. 6
By pressing from above and applying a light pressure to the pin 7, it is possible to prevent the pin 30 from rising and to prevent the gap between the pin 7 and the screw groove 5 from being generated. It is possible to improve the feed accuracy by preventing the rattling of motion and backlash. Furthermore, the pin 7 is not separated from the feed screw shaft 4, and the problem that the life of the feed mechanism is shortened can be solved. In addition, adjustment screw 11 and pin 7
With the engaging part that forms the table, light pressure can be applied to feed the table accurately, or a slight gap can be allowed to allow the table to move lightly and adjustments can be made according to these applications. Becomes Furthermore, a table feed mechanism having a simple structure can be formed.

In the table feed mechanism according to the present invention, two sets of the table feed mechanism described above may be configured in the X direction and the Y direction which are orthogonal to each other. That is, the X-direction slide table 3 guided by the X-direction guide shaft 2 is moved in the X-direction by the rotation of the X-direction feed screw shaft 4 provided in parallel with the X-direction guide shaft 2. In addition to the X direction, a mechanism similar to the X direction is provided for the Y direction. That is, a Y-direction guide shaft orthogonal to the X-direction guide shaft 2 is provided on the X-direction slide table 3, and the Y-direction slide table is parallel to the Y-direction guide shaft. An engaging member having an engaging portion that engages with the thread grooves of the X-direction and Y-direction feed screws, which is configured to move along the Y-direction guide shaft by rotation of the provided feed screw shaft. Are attached to the X-direction and Y-direction slide tables, respectively, and X-direction and Y-direction separation preventing members for preventing the engagement portion from separating from the respective screw grooves are provided. A table feed mechanism can be configured.

The table feeding mechanism according to the present invention may be driven by attaching a slit disk or other sensor plate for detecting rotation to a DC motor instead of the pulse motor.

As another embodiment of the table feeding mechanism according to the present invention, as shown in the explanatory view of the table feeding mechanism shown in FIG. 4, a convex portion 21 is formed on the lower portion of the table 20 and a half nut 22 is fed. It is to be engaged with the screw shaft 4.

[0018]

As described above, in the table feed mechanism according to the present invention, the slide table guided by the guide shaft is configured to be moved by the rotation of the feed screw shaft provided in parallel with the guide shaft. In the table feeding mechanism described above, a pin having an engaging portion that engages with the screw groove of the feed screw shaft is attached to the slide table, and a detachment preventing member that prevents the engaging portion from detaching from the screw groove. By providing the pin, lifting of the pin can be prevented, a gap between the pin and the screw groove is not generated, vertical movement in the engaging portion and backlash can be prevented, and feed accuracy is improved. It becomes possible. In addition, the clearance between the pin and the screw groove can be adjusted so that the table can be moved lightly by allowing a minute clearance. Furthermore, the pin does not come off the feed screw shaft, and The life can be extended.

[Brief description of drawings]

FIG. 1 is a side sectional view of a table feed mechanism according to an embodiment of the present invention.

FIG. 2 is also a plan view of FIG.

FIG. 3 is likewise a side view of FIG. 1 as viewed from the right side.

FIG. 4 is a sectional view of a main part according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional drive portion.

FIG. 6 is a vertical sectional view of the same.

[Explanation of symbols]

 2 Guide shaft 3 Table 4 Feed screw shaft 5 Screw groove 6 Pin support plate 7 Pin 8 Holding piece 11 Adjustment screw

Claims (3)

[Claims] 1. A table feed mechanism configured to move a slide table guided by a guide shaft by rotation of a feed screw shaft provided in parallel with the guide shaft, and engages with a thread groove of the feed screw shaft. A table feed mechanism characterized in that an engaging member having an engaging portion is attached to the slide table, and a detachment preventing member for preventing the engaging portion from detaching from the screw groove is provided. 2. An engaging portion that engages with the screw groove is a pin member, and the separation preventing member is an adjusting screw for adjusting the engagement state of the pin member with the screw groove. The table feeding mechanism according to claim 1. 3. A first guided by a first guide shaft
The slide table is moved in the first direction by the rotation of the first feed screw shaft provided in parallel with the first guide shaft, while the second slide table is provided on the first slide table in a direction orthogonal to the first guide shaft. A table provided with a guide shaft and configured to move the second slide table on the second guide shaft along the second guide shaft by rotation of a feed screw shaft provided in parallel with the second guide shaft. An engaging member, which is a feed mechanism and has engaging portions that engage with the thread grooves of the first and second feed screw shafts, is attached to the first and second slide tables, respectively, and the engaging portion is provided. The table feed mechanism is provided with first and second separation preventing members for preventing the respective parts from being separated from the respective screw grooves.