JPH109359A - Table feeding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table feeding mechanism of such a structure that a fitting member to be engaged by a drive shaft for feeding is mounted on a slide table and makes movement in rolling contact with the drive shaft. SOLUTION: This table feeding mechanism concerned 1 is composed of a slide table 3 on which a fitting member 9a to be engaged by a drive shaft for feeding 4 is mounted and a guide shaft 2 for guidance in the moving direction paralel with the drive shaft 4, wherein the slide table 3 is moved with rotation of the drive shaft 4. The drive shaft 4 is formed in a single piece with the shaft of a motor 15, and a spiral screw groove 5 is formed at the periphery of the drive shaft 4 over the range where a moving member makes movement. The member 9a rotates a roller 9 having a fitting protrusion 8 at the periphery through bearings 7 furnished at the ends of a roller supporting shaft 6 which perpendicularly intersects the screw groove 5 in the shaft 4.

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 capable of moving a moving member in a predetermined direction with high precision. For example, in addition to a table feed mechanism used in a processing machine and an assembling machine, various information is provided. The present invention relates to a table feed mechanism that can be applied to a head carriage moving mechanism of a device.

[0002]

2. Description of the Related Art As a moving means for moving a moving member in a predetermined direction with high accuracy, there is, for example, a table feed mechanism used in a head carriage of various information equipment in addition to a processing machine and an assembling machine. Of these, there is a head carriage moving mechanism used in a recording apparatus that performs recording and reproduction 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. FIG. 8 is a side view of the driving portion, and FIG. 9 is a longitudinal sectional view of the driving portion and the head carriage portion. In each of the drawings, the portions inside the dot circles are enlarged views of the main parts in the upper direction of the arrows. I have. 8 and 9, 3
Reference numeral 8 denotes a head support for supporting a magnetic head (not shown), which is always resiliently biased so that the tip thereof tends to move toward the tip of the head carriage 31. A guide shaft 40 guides the movement of the head support 38. The head support 38 moves to the guide shaft 40 when the guide shaft 40 is inserted into a guide hole 34 formed in the head carriage 31. It is held freely and is guided in the moving direction by the guide shaft 40.

[0003] Reference numeral 30 denotes an engagement pin formed to protrude horizontally from the side of the head carriage 31 on the motor side,
The engagement pin 30 is engaged with a portion of a screw groove 36 formed on a feed screw shaft 35 of the motor shaft 33 on a side facing the chassis 39. The engagement pin 30 is engaged with the screw groove 36 of the feed screw shaft 35 when the base end is fixed to the carriage 31 by the screw 41 and the distal end of the leaf spring 37 is It is held by being elastically contacted with the portion located on the 39 side. That is, the engaging pin 30 is resiliently pressed from below into the screw groove 36 of the feed screw shaft 35 by the upward resilient force of the head carriage 31 urged by the resilient force of the leaf spring 37, and It is engaged with the screw groove 36 so as to be able to move in and out.

The operation of the above configuration will be described. The motor shaft 33 is finely step-driven at a predetermined rotation angle with the rotation of the motor 32. When the motor shaft 33 rotates in a predetermined direction, the engagement pin The head carriage 31 can move in the axial direction of the motor shaft 33.
And the head support 38 can be moved.

[0005]

However, as the moving means for moving the conventional head carriage, the load on the moving member must be light, and when a heavy load needs to be applied, depending on the degree of the load. Then, the pin 30 is lifted up from the feed screw shaft 35, or the pin 30 is separated from the feed screw shaft 35. Further, the screw groove 36 is cut into a V-shape due to the wear of the pin 30 and the screw groove 36 provided on the feed screw shaft 35, so that the pin 30
A gap is formed between the pin 30 and the screw groove 36, which causes backlash due to the vertical movement of the pin 30, and backlash due to irregular wear of the screw groove 36, leading to a decrease in feed accuracy, There was a problem that the life of the feed mechanism was shortened. Further, the same inconvenience as described above has been caused by the wear of the pin 30. In the feed mechanism according to the above-described moving means, sufficient accuracy cannot be obtained because the applied pressure and the gap between the pin 30 and the screw groove 36 cannot be adjusted. It had the drawback of being limited to the applicable range.

The present invention has been made in view of the above circumstances, and eliminates a gap between an engaging portion and a thread groove, prevents wear of the engaging portion and the thread groove, and raises the engaging portion. And to prevent withdrawal. It is another object of the present invention that the table can be sent with high accuracy by applying light pressurization, and a long life can be obtained even under heavy load.

[0007]

In order to achieve the above object, according to the present invention, a slide table guided by a guide shaft is moved by rotation of a feed drive shaft provided in parallel with the guide shaft. In the table feed mechanism configured as described above, an engaging member having an engaging portion that engages with the feed drive shaft is attached to the slide table and the engaging member is rotatably provided, and the engaging member is The drive shaft is configured to be moved while making rolling contact with the drive shaft.

In the present invention, the feed drive shaft has a spiral groove or a convex portion as a feed drive unit, and the engaging member is provided in a direction in which the feed drive unit is formed. It comprises an orthogonal support shaft, a roller rotatably provided on the support shaft, and an engaging portion formed on the outer periphery of the roller for engaging with the groove or the convex portion.

Further, in the present invention, a plurality of the engaging members are attached to the slide table, and the plurality of engaging members are located at positions substantially close to the axial direction of the feed driving shaft, and The plurality of engaging members are attached such that respective engaging portions apply forces in opposite directions to the feed drive shaft. A plurality of members are attached to the slide table, and a plurality of feed drive portions of the feed drive shaft are provided corresponding to the engagement members, and the plurality of engagement members are substantially the same in the axial direction of the feed drive shaft. It is configured such that the feed drive shaft is sandwiched between positions.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a table feed mechanism according to the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a partial cross-sectional side view taken along line AA of FIG. 2 showing an embodiment of a table feed mechanism according to the present invention, with a main part cut away. 2 is a plan view of FIG. 1, and FIG.
FIG. 4 is an enlarged view of a portion indicated by a dotted circle C in FIG.
It is a perspective view which shows a.

FIG. 1 shows a table feed mechanism 1 according to the present invention.
, A slide table 3 having a mounting hole for fixing the moving member, the slide table 3 being configured to move in a linear direction with the moving member mounted thereon, and a drive shaft for feeding the slide table 3. And a slide table 3 guided by the guide shaft 2 is moved by rotation of a feed drive shaft 4 provided in parallel with the guide shaft 2. ing.

The feed drive shaft 4 is formed integrally with the drive shaft of the motor 15 mounted on the frame 16, the other end of the feed drive shaft 4 is mounted on the frame 17 via a bearing 18, and the outer peripheral portion is provided with a moving member. A helical screw groove 5 is formed over the range to be moved, and an engaging member 9a for engaging a roller 9 having an engaging ridge 8 in the screw groove 5 attaches the roller support shaft 6 to the roller support member 11. It is attached to the slide table 3 by screws 19. The engaging member 9a is provided with a roller support shaft 6 perpendicular to the screw groove 5 of the feed drive shaft 4 in the direction of the screw groove 5, and the roller support shaft 6
A roller 9 is rotatably provided via bearings 7 provided at both ends of the roller 9 so that the engaging member 9a is moved while making rolling contact with the feed drive shaft 4. An engaging ridge 8 engaging with the thread groove 5 is provided.
Is engaged with the engaging ridge portion 8.

As shown in FIG. 3, the engaging member applies a pressurizing force to the bearing 7 by allowing a pressurizing spring 10 formed by a spring to penetrate the roller supporting shaft 6. That is, the pressurizing spring 10 includes a bearing 7 provided on the roller support shaft 6 and
A constant pressure is always applied to the roller 9, and the engaging ridge 8, which is an engaging portion, is pressurized in the arrow P direction. As a result, the pressure of the engaging member 9a with respect to the thread groove 5 of the feed drive shaft 4 becomes uniform, the adjustment is simplified, and the accuracy is improved.

In the above configuration, the operation of the table feed mechanism according to the present invention will be described. When the feed drive shaft 4 rotates in the direction of the arrow R with the rotation of the motor 15, the spiral screw groove 5 becomes P The roller 9 having the engaging ridges 8 in the engaged state moves while rollingly contacting the feed drive shaft 4. Thereby, the slide table 3 attached to the roller support member 11 is moved.

Since the table feed mechanism according to the present invention is constructed as described above, the roller 9 of the engaging member
Is not lifted off or separated from the feed drive shaft 4, and the thread groove 5 is cut into a V-shape due to wear with the thread groove 5 provided on the feed shaft drive shaft. There is no gap between the engaging ridge 8 and the screw groove 5. Furthermore, there is no backlash caused by the vertical movement of the engaging portion and irregular wear of the screw groove 5, and the feed accuracy of the slide table 3 does not decrease. It doesn't get shorter.

Next, a second embodiment according to the present invention will be described with reference to FIGS. FIG. 5 is a plan view of a table feed mechanism showing a second embodiment according to the present invention, and FIG. 6 is an enlarged perspective view of a main part of FIG. In the second embodiment according to the present invention, as shown in FIGS.
In addition to the rollers 9 having the engaging ridges 8, two rollers 21 having the engaging ridges 20 are attached, and two feed drive units of the feed drive shaft 4 are provided. The joint member is provided at substantially the same position in the axial direction of the feed drive shaft 4 so as to sandwich the feed drive shaft 4. Then, in addition to the screw groove 5, the screw drive 5
The screw groove 25 is provided at a position facing the. As a result, a balance of the forces acting between the rollers 9 and 21 and the feed drive shaft 4 is obtained, and no bending moment occurs in the feed drive shaft 4. The illustration of the roller support member and the like is omitted in the drawings.

Further, a third embodiment according to the present invention will be described with reference to FIG. FIG. 7 is a side view showing a main part of a table feed mechanism according to the third embodiment in a cross section. In the third embodiment according to the present invention, the pressurizing of the engaging member 9a is performed without using a spring.
Instead, a screw groove portion 23 was formed on the feed drive shaft 4 side of the roller support shaft 22, and the pressurized nut 26 and the pressurized lock nut 27 were screwed together, and the shaft of the roller support shaft 22 was pressed in the direction of the arrow. In this state, it is tightened with a set screw 28 and pressurized in the direction of arrow Q. With such a fixed position pressurization, a high-precision feed mechanism can be secured even when a large load is applied.

As described above, the embodiment according to the present invention has been specifically described. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. is there. For example, in the above embodiment, a helical screw groove 5 is formed on the outer peripheral portion of the feed drive shaft 4 over a range in which the moving member is moved, and the roller 9 having the engaging ridge 8 is engaged with the screw groove 5. Had the engaging member 9a to
Instead of the thread groove 5, an engaging ridge may be formed on the outer periphery of the feed drive shaft 4, and a groove may be formed on the engaging portion side. In the above embodiment, one or two rollers are used as the engaging members. However, the number of the rollers is set to three or four, and the number of the corresponding screw grooves is also set to three or four. May be.

[0019]

As described above, in the table feed mechanism according to the present invention, the engaging member having the engaging portion for engaging the feed drive shaft is mounted on the slide table, and the engaging member is rotatable. And the engaging member is configured to be moved while making rolling contact with the feed drive shaft, so that the roller of the engaging member is lifted up or separated from the feed drive shaft. There is no
The thread groove is not cut into a V-shape due to abrasion of the thread groove provided on the feed shaft drive shaft, and no gap is formed between the engaging ridge and the thread groove. Further, no rattling due to the vertical movement of the engaging portion and no backlash due to irregular wear of the screw groove are generated. Therefore,
The feed accuracy of the slide table is improved, the accuracy is easily ensured even in the case of fine feed, the life of the table feed mechanism can be prolonged, and the reliability can be increased. Further, there is no loss in the driving force of the feed shaft driving shaft, and a large thrust can be obtained with a small driving force. Further, since the plurality of engaging members can be adjusted by performing the pressurization adjustment once, the time required for the adjustment can be reduced, and maintenance is not required for a long period of time. Further, there is no need to use expensive components such as a ball screw, and the cost can be reduced.

Further, the feed drive shaft has a helical groove or projection as a feed drive unit, and the engaging member has a support shaft orthogonal to the forming direction of the feed drive unit; Since the roller has a roller rotatably provided on the support shaft and an engaging portion formed on the outer periphery of the roller engaged with the groove, a gap between the engaging portion and the thread groove is eliminated. At the same time, wear of the engaging portion and the screw groove can be prevented, and lifting and detachment of the engaging portion can be prevented. A plurality of engaging members are attached to the slide table, and the plurality of engaging members are provided at positions substantially close to the axial direction of the feed drive shaft so as to sandwich the feed drive shaft, A balance of forces acting between the roller and the feed drive shaft is obtained, and no bending moment is generated in the feed drive shaft.

Further, since the plurality of engaging members are attached so that the respective engaging portions apply forces in opposite directions to the feed drive shaft, a balance of forces can be obtained, and Generation of a bending moment with respect to the driving shaft can be prevented. Further, a plurality of engaging members are attached to the slide table, and a plurality of feed driving portions of the feed driving shaft are provided corresponding to the engaging members, and the plurality of engaging members are connected to the shaft of the feeding drive shaft. By being provided so as to sandwich the feed drive shaft at almost the same position in the direction,
Because the load is balanced against the feed drive shaft,
No bending of the shaft occurs, and accuracy can be maintained even under high load.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view taken along line AA in FIG. 2 of an embodiment of a table feed mechanism according to the present invention, with a main part cut away.

FIG. 2 is a plan view of a table feed mechanism according to the present invention.

FIG. 3 is an enlarged view of a portion indicated by a dotted circle C in FIG.

FIG. 4 is a perspective view showing an engagement member of the present invention.

FIG. 5 is a plan view of a table feed mechanism according to a second embodiment of the present invention.

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is a side view showing a cross section of a main part of a table feed mechanism according to a third embodiment of the present invention.

FIG. 8 is a side view of a driving portion in a conventional table feed mechanism.

FIG. 9 is a longitudinal sectional view of a driving section and a head carriage section in a conventional table feed mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Table feed mechanism 2 Guide shaft 3 Slide table 4 Feed drive shaft 5 25 Screw groove 6 22 Roller support shaft 7 Bearing 8,20 Engagement ridge 9,21 Roller 10 Pressurizing spring 11 Roller support member 12 Pressurizing ring 13 Set screw 15 Motor 19 Mounting screw 23 Screw groove 26 Pressurized nut 27 Pressurized lock nut 28 Set screw

Claims (5)

[Claims] In a table feed mechanism configured to move a slide table guided by a guide shaft by rotation of a feed drive shaft provided in parallel with the guide shaft, a table engaging mechanism that engages with the feed drive shaft. An engaging member having a joining portion is attached to the slide table and the engaging member is rotatably provided, and the engaging member is moved while rollingly contacting the feed drive shaft. A table feed mechanism. 2. The feed drive shaft has a spiral groove or a projection as a feed drive unit, and the engaging member is provided with a support shaft orthogonal to a forming direction of the feed drive unit. ,
2. The device according to claim 1, further comprising a roller rotatably provided on said support shaft, and an engaging portion formed on an outer periphery of said roller for engaging said groove or convex portion. -Bull feed mechanism. 3. A plurality of said engaging members are attached to said slide table, and said plurality of engaging members are located substantially close to an axial direction of said feed drive shaft so as to sandwich said feed drive shaft. The table feed mechanism according to claim 1, wherein the table feed mechanism is provided. 4. The table according to claim 3, wherein the plurality of engaging members are attached such that respective engaging portions apply forces in opposite directions to the feed drive shaft. Feed mechanism. 5. A plurality of said engaging members are mounted on said slide table, and a plurality of feed driving portions of said feed drive shaft are provided corresponding to said engaging members. 3. The table feed mechanism according to claim 2, wherein the feed drive shaft is provided at substantially the same position in the axial direction of the drive shaft so as to sandwich the feed drive shaft.