JPH0518416A - Slide mechanism - Google Patents

Abstract

(57) [Summary] [Object] To provide a slide mechanism capable of adjusting a contact pressure and a clearance with a V-groove bearing supporting a slide plate arranged in a large number of rows in an inexpensive, accurate and efficient method. [Structure] A large number of slide plates 1 arranged, a large number of V groove bearings 2 arranged to hold and slide the slide plates 1, a shaft 3 holding the V groove bearings 2, and a shaft 3 With the eccentric bush 9 inserted into both ends of the eccentric bush for eccentric rotation, the adjustment work can be efficiently performed by the eccentric function of the eccentric bush 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide mechanism of a device for controlling a radiation irradiation area in medical equipment or the like, or a positioning automation device in a parts assembly line.

[0002]

2. Description of the Related Art A conventional slide mechanism will be described with reference to FIGS. In the figure, 1 is a slide plate having projecting V-shaped taper portions and rack portions 1a at both ends of the width W and performing a predetermined linear movement. 2 is a V groove in which the slide plate 1 is in partial contact. V-groove bearing 3 has a shaft for holding the V-groove bearing 2,
It is fixed and positioned by the frame 4. 4a is an inspection window provided for inspecting and adjusting the inside of the frame 4, 5
Is a pinion that engages with the rack 1a of the slide plate 1 to transmit the driving force, 6 is a motor that supplies the driving force to the pinion 5, 7 is a drive shaft that transmits the driving force from the motor 6 to the pinion 5, and is a drive shaft in this figure. The detailed diagram of the system is omitted. Reference numeral 8 is a collar for arranging a large number of slide plates 1 and V-groove bearings 2 positioned at equal intervals P. Here, as shown in FIG. 13, as the V-groove bearing 2, a ball type having an V-groove outer ring 21 and an inner ring 22 having a V-groove is used.

Next, the operation will be described. The purpose of this mechanism is to move the slide plate 1 to a distance corresponding to the command value input to the motor 6 with a small shake. In order to move the slide plate 1 at a predetermined speed and acceleration, a driving force is applied to the slide plate 1 in the system of motor 6 → drive shaft 7 → pinion 5.
Must be transmitted to the rack 1a. In order for the transmitted driving force to be effectively converted into the moving energy of the slide plate 1, the frictional force must be reduced by maintaining the contact pressure between the slide plate 1 and the V groove bearing 2 appropriately. Further, since the runout of the slide plate 1 must also be made small, it is necessary to minimize the gap between the contact portion between the V groove bearing 2 and the slide plate 1. Factors that satisfy these two conditions are the tolerance of the width dimension W of the slide plate 1 and the slide plate 1.
It is the positional tolerance of the distance L between the shafts 3 holding the V-groove bearings 2 facing each other. However, this conventional mechanism does not have the function of absorbing the above dimensional tolerances, and depends only on the precision of the slide plate 1 and the frame 4 during machining.

[0004]

Since the conventional slide mechanism is constructed as described above, the contact pressure and the clearance cannot be finely adjusted structurally, and the W dimension on the slide plate 1 side is corrected according to the present situation. There was no choice but to make adjustments by additional processing. Therefore, there is a problem that the adjustment takes time and the cost becomes high due to additional processing.

The present invention has been made in order to solve the above-mentioned problems, and adds an efficient adjusting function capable of making an adjustment in a short adjustment time and at a low cost, and at the same time, a slide mechanism having a high accuracy of linear movement. Aim to get.

[0006]

A slide mechanism according to the present invention is provided with eccentric bushes at both ends of a shaft holding a V-groove bearing so that the distance between the shafts can be easily and finely adjusted. Is. Further, the slide mechanism according to the present invention is configured such that the slide plate can be linearly moved by a linear guide rail provided on the slide plate and a guide block provided on the frame and rollingly engaged with the linear guide rail. Is.

[0007]

In the present invention, since the eccentric bush is the amount of eccentricity itself and the adjustment allowance, when adjusting, it is sufficient to rotate and fix the eccentric bush to a position where a proper contact pressure and a proper gap can be obtained. Further, according to the present invention, since the linear guide rail and the guide block rollingly engaged with the linear guide rail move the slide plate in a straight line with high accuracy, it is not necessary to adjust the position of the slide plate.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS. 1 is the same sectional view as FIG. 12, and FIG. 2 is FIG.
FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 2 is viewed from the left side. In the figure, 9 is an eccentric bush inserted into both ends of the shaft 3 holding the V-groove bearing 2,
10 is a screw for fixing the eccentric bush 9 to the frame 4, 1
1 is a shaft center axis indicating the rotation center of the shaft 3,
Reference numeral 12 denotes an eccentric bush center shaft that indicates the center of rotation of the eccentric bush 9. Now, it is assumed that the deviation between the shaft center shaft 11 and the eccentric bush center shaft 12, that is, the amount of eccentricity is δ.

Next, the operation will be described. As shown in FIG. 1, between the shafts 3 facing each other via the slide plate 1, one side remains fixed and eccentric bushes 9 are inserted into both ends of the other shaft 3. The eccentric bush 9 is inserted into a hole machined with high precision in the frame 4, and also comes into contact with the collar 8 to apply an appropriate preload in the axial direction to prevent the slide plate 1 from being displaced and shaken. Here, the adjustment when the slide plate 1 and the V groove bearing 2 are provided with appropriate contact pressure and clearance will be described. First, loosen the screw 10 fixing the eccentric bush 9 to remove the eccentric bush 9 arranged at both ends of the shaft 3
(K) Give the rotation angle little by little. At this time, the shaft center shaft 11 of the shaft 3 is eccentric bush center shaft 12
Since the V-groove bearing 2 held by the shaft 3 rotates at the same time around the turning radius of δ, the V-groove bearing 2 also rotates around the eccentric bush center shaft 12 at the turning radius of δ. Due to this eccentric rotation, the variations in the distance L between the shafts 3 and the width dimension W of the slide plate 1 are absorbed. When the contact pressure and the clearance become appropriate, the rotation of the eccentric bush 9 is finished, and the screw 10 is fastened again to prevent the positional deviation after the adjustment, and the adjustment work is finished.

Embodiment 2. In addition, in the above-mentioned embodiment, a large number of V groove bearings 2 are simultaneously rotated by the rotation of the eccentric bush 9 supporting the shaft 3. However, without using the eccentric bush 9, the V groove bearings 2 are eccentric. Even if it has a function, it has the same effect. In this case, a feature is added that each variation can be absorbed even if each variation width due to the dimensional tolerance of the slide plate 1 is increased or so-called tolerance is loosened. An embodiment in this case will be described below with reference to FIGS. 4 is the same sectional view as FIG. 1, and FIG. 5 is FIG.
6 is a partially enlarged view of FIG. 6, and FIG. 6 is a schematic view of FIG. 5 viewed from the left.
The same or corresponding portions as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 2A is an eccentric V groove bearing having a center of rotation (shown by the center shaft 13) eccentric by δ, 2a is an outer ring of the eccentric V groove bearing 2A, and 2b is an eccentric inner ring. The eccentric inner ring 2c is an adjusting nut joined to or integrated with the eccentric inner ring 2b, 14 is an adjusting wrench that gives a rotation angle to the adjusting nut 2c, 3a is a male screw portion provided on the shaft 3, 15
Is a preload nut screwed into the male screw portion 3a.

As shown in FIG. 4, between the shafts 3 facing each other through the slide plate 1, only one side is to be adjusted and the other side is fixed. Therefore, the structure on the fixed side is different from that shown in FIG. Absent. Here, the adjustment when a proper contact pressure and a proper gap are applied to the contact portions of the slide plate 1, the eccentric V groove bearing 2A, and the fixed V groove bearing 2 will be described. First, the eccentric V groove bearing 2
A preload is applied to A to loosen the preload nut 15 which prevents the slide plate 1 from being displaced and shaken by the male screw portion 3a, so that the eccentric inner ring 2b and the adjusting nut 2c of the eccentric V-groove bearing 2A are rotatable. Next, the adjustment wrench 14 is inserted from the inspection window 4a of the frame 4 and fitted into the adjustment nut 2c to gradually give a rotation angle. At this time, since the shaft center shaft 11 of the shaft 3 and the eccentric inner ring center shaft 13 are eccentric by δ as described above, the eccentric inner ring 2b rotates about the shaft center shaft 11 at the same time as the adjustment nut 2c rotates. To rotate. Due to this eccentric rotation, the distance L between the eccentric V-groove bearing 2A and the shaft 3 holding the fixed V-groove bearing 2 apparently changes, so that the eccentric V-groove bearings 2A and V
The contact condition of the V-shaped taper portion of the slide plate 1 which is in contact with the V groove of the groove bearing 2 can also be changed, and variations in the dimension L and the width dimension W of the slide plate 1 are absorbed. Therefore, when the contact pressure and the clearance become appropriate, the rotation of the eccentric inner ring 2b is finished, and the preload nut 15 is fastened again by the male screw portion 3a with a tightening torque that gives an appropriate preload to the eccentric V-groove bearing 2A. This completes the adjustment work.

Embodiment 3. Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 7 is the same sectional view as FIG. 11, and FIG. 8 is an enlarged sectional view taken along the line VIII-VIII of FIG. In the figure, 16 is a linear guide rail provided at the end of the slide plate 1 opposite to the rack portion 1a, and 17 is a guide block provided on the inner surface of the frame 4, in which the linear guide rail 16 is rollingly engaged by a ball 18. ing. Next, the operation will be described. Motor 6
Since the mechanism for converting the rotational power generated by the linear motion of the slide plate 1 is the same as that of the conventional device, the description thereof will be omitted. In this apparatus, a combination mechanism of a linear guide rail 16 and a guide block 17 is adopted as a linear guide mechanism for the slide plate 1. As shown in FIG. 8, the linear guide rail 16 has U-shaped grooves on both side surfaces in which the balls 18 are fitted. On the other hand, the guide block 17 has a ball 18
Form two series of circulating ball rows. The U-shaped groove of the linear guide rail 16 and the ball row of the guide block 17 roll-engage with each other, so that the slide plate 1 can move linearly extremely smoothly and accurately. Further, by preliminarily assembling the linear guide rail 16 and the guide block 17, it is not necessary to adjust the position of the slide plate 1.

Embodiment 4. Further, in the third embodiment described above, a case where only the linear guide rail 16 and the guide block 17 are combined as the linear guide mechanism of the slide plate 1 has been described, but the slide plate 1 may be provided with a guide roller. An example of this case will be described with reference to FIG. In the configuration of the third embodiment, a guide roller 19 and a guide roller shaft 20 are added to the slide plate 1. The guide roller 19 makes rolling contact with the adjacent slide plate 1. By thus embedding the guide roller 19 on one side of the slide plate 1, it becomes possible to accurately maintain the gap between the slide plates 1 adjacent to each other. Further, in the case where the linear guide rail 16 and the guide block 17 alone are combined to support the slide plate 1 on one side as a linear guide mechanism, the slide plate 1 may tilt due to the influence of gravity depending on the installation direction of the apparatus. Guide roller 1
Since the load is transmitted by means of 9, the sliding movement of the slide plate 1 can be prevented while the slide plate 1 is being fallen down, and the linear movement can be performed with high accuracy.

[0014]

As described above, according to the present invention, the eccentric bushes are inserted at both ends of the shaft so that the contact pressure and the clearance of the contact portions of the slide plates and the V-groove bearings holding the slide plates can be changed. In addition, since the V-groove bearings each have an eccentric function, the adjustment work can be performed efficiently, and thus a highly accurate slide mechanism can be obtained at low cost. Further, according to the present invention, since the slide plate is provided with the linear guide rail and the frame is provided with the guide block which is rollingly engaged with the linear guide rail, the slide plate can be moved linearly with high accuracy, so that the device can be inexpensive, Further, there is an effect that a highly accurate product can be obtained. Further, according to the present invention, since the straight guide rails are arranged on one side surface of the slide plate and the guide rollers which make rolling contact with the adjacent slide plates on the opposite side surface are provided, the accuracy of the slide plate is prevented while the slide plate is prevented from collapsing. This has the effect of allowing a high straight movement.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a diagram of FIG. 2 seen from the left.

FIG. 4 is a cross-sectional view of essential parts showing Embodiment 2 of the present invention.

FIG. 5 is a partially enlarged view of FIG.

FIG. 6 is a schematic view of FIG. 5 viewed from the left.

FIG. 7 is a cross-sectional view of essential parts showing Embodiment 3 of the present invention.

8 is an enlarged cross-sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a sectional view showing Embodiment 4 of the present invention.

FIG. 10 is an external perspective view showing a conventional one.

11 is a cross-sectional plan view of FIG.

12 is a cross-sectional view taken along the line XII-XII in FIG.

13 is a diagram showing the V-groove bearing of FIG. 12. FIG.

[Explanation of symbols]

1 slide plate 2 V groove bearing 2A eccentric V groove bearing 2a V groove outer ring 2b Eccentric inner ring 2c Adjustment nut 3 shafts 3a Male screw part 4 frames 4a Inspection window 6 motor 8 colors 9 Eccentric bush 11 Shaft center axis 12 Eccentric bush center shaft 13 Eccentric inner ring center shaft 15 Preload nut 16 Straight guide rail 17 Guide block 18 balls 19 Guide roller 20 Guide roller shaft

Claims (4)

[Claims] 1. A plurality of slide plates arranged, a plurality of V groove bearings arranged to hold and slide the slide plates, a shaft holding the V groove bearings, and inserted into both ends of the shaft. A slide mechanism comprising a bush that rotates eccentrically. 2. A slide mechanism comprising a plurality of V-groove bearings which are held on a shaft and rotate eccentrically individually, and the slide plate is held by the V-groove bearings. 3. A linear guide rail is provided on each of a plurality of slide plates arranged, and a guide block rollingly engaged with the linear guide rail is provided on a frame so that each slide plate can move linearly. A slide mechanism characterized by the above. 4. The slide mechanism according to claim 3, wherein a straight guide rail is provided on one side surface of each slide plate, and guide rollers are provided on the opposite side surface for rolling contact with adjacent slide plates.