JPH0543098U - Straight guide device - Google Patents

Abstract

(57) [Summary] [Purpose] The object is to always keep the air gap formed between the linear guide and the air pad constant even if the guide surface of the linear guide is deformed. A carriage 2 is provided with a holding member for holding one of air pads 3a and 3b corresponding to two guide surfaces parallel to each other, and a housing 12 opened in a direction substantially orthogonal to a guide surface 1b corresponding to one air pad 3b. And the air pad 3 on one side provided in the housing 12 integrally with
a coil spring 11 that generates an elastic force in a direction substantially orthogonal to the guide surface 1b corresponding to b, and an auxiliary member 6 that engages with the coil spring 11 and holds the air pad 3b in a tiltable manner.
b, 10 and a leaf spring 13 that holds the auxiliary members 6b, 10 on the carriage 2 in a displaceable manner.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear guide device in which a carriage having an air pad moves along a linear guide.

[0002]

[Prior Art]

 The conventional linear guide device is configured as shown in FIG. In FIG. 2, the air pads 3a, 3b, 3c are arranged so as to correspond to the respective guide surfaces of the linear guide 1. Each of the air pads 3a and 3c is formed with a recess on the surface (rear surface) opposite to the guide surface of the guide 1. Steel balls 6a and 6c are fitted into the recesses, and the steel balls 6a and 6c are screwed onto the carriage 2. The adjusting screws 5a and 5c are fitted in the recesses. As a result, the air pads 3a and 3c are tiltably supported between the carriage 2 and the guide surface of the linear guide 1. Further, the air pad 3b has a steel ball 6b fitted in a recess formed on the back surface of the air pad 3b, the steel ball 6b is received by the pivot shaft 7, and the plate attached to the adjusting screw 9 screwed with the pivot shaft 7 to the carriage 2. The spring 8 applies pressure to the inner surface of the guide 1. Therefore, the air pad 3b is tilted and elastically pressed toward the guide surface of the linear guide guide 1.

[0003]

[Problems to be solved by the device]

 In the conventional technology as described above, the disc spring can generate a large thrust load, but when the spring constant is large and the relative position between the guide surface and the air pad of the carriage changes, the thrust load generated by the disc spring changes greatly. , The air gap formed between the linear guide and the air pad changes.

The present invention has been made in view of the above-mentioned conventional problems. Even if the relative position between the inner surface of the linear guide and the air pad of the carriage changes, the present invention provides a space between the linear guide and the air pad. The purpose is to always maintain a constant air gap formed in the.

[0005]

[Means for Solving the Problems]

 In the present invention according to claim 1, the holding member for holding one of the air pads (3b) corresponding to at least one guide surface is opened toward the guide surface (1b) corresponding to one air pad (3b). The housing (12) is provided integrally with the carriage (2) and is attached to the air pad (3b) via an auxiliary member (10, 6b) that holds the air pad (3b) in a tiltable manner, and an auxiliary member (10, 6b). A first elastic member (11) for giving a force is provided in the housing (12) so that it can be displaced in the urging direction of the first elastic member (11) and is not displaced substantially except in the urging direction. The second elastic member (13) holds the member (10, 6b) on the carriage (2).

According to the second aspect of the present invention, a holding member for holding one of the air pads (3a, 3b) corresponding to two guide surfaces parallel to each other is provided with a holding member for holding a guide surface (1b) corresponding to one air pad (3b). The housing (12) opened in the direction of the arrow (1) is provided integrally with the carriage (2), and an auxiliary member for tiltably holding the air pad (3b) and one air pad (3b) via the auxiliary member (10, 6b) are provided. A coil spring (11) for applying an urging force to the coil spring (11) is provided in the housing (12) so that the coil spring (11) can be displaced in the urging direction, and the auxiliary member (10, 6b) is not substantially displaced in a direction other than the urging direction. ) Is held on the carriage (2), and a leaf spring (13) is held.

[0007]

[Action]

 According to the above configuration, a large thrust load can be generated on the air pad by increasing the amount of deflection of the elastic member, and the deformation of the guide surface can be absorbed by minimizing the spring constant of the elastic member. Therefore, even if the guide surface of the linear guide is deformed under the influence of the ambient temperature, the air gap formed between the air pad and the guide surface of the linear guide can always be kept constant.

[0008]

【Example】

 FIG. 1 shows an embodiment of the present invention. By the prismatic linear guide guide 1 extending in the direction perpendicular to the plane of the drawing, two parallel guide surfaces 1a and 1b and at least one guide surface 1c orthogonal to the two guide surfaces 1a and 1b are obtained. The carriage 2 moving along the linear guide 1, the air pads 3a, 3b, 3c provided corresponding to the respective guide surfaces 1a, 1b, 1c, and the air pads 3a, 3b, 3c are provided for the carriage 2. Holding members 5a, 5c, 6a, 6b, 6c, 10, 11, 12, and 13 that tiltably hold the guide surfaces 1a, 1b, and 1c are provided. The holding members 5a and 6a of the air pad 3a were formed by inserting the steel balls 6a into the recesses formed on the surface (rear surface) opposite to the guide surface 1a of the guide 1 of the air pad 3a and screwing the steel balls 6a into the carriage 2. The adjusting screw 5a is formed by fitting it into the recess. The holding member of the air pad 3b is provided with a housing 12 which is opened in a direction substantially orthogonal to the guide surface 1b corresponding to the air pad 3b integrally with the carriage 2 and has a guide surface corresponding to one air pad 3b in the housing 12. A coil spring 11 for generating an elastic force in a direction substantially orthogonal to 1b is provided, and a steel ball 6b fitted in a recess of the pivot shaft 10 engaging with the coil spring 11 is fitted in a recess on the back surface of the air pad 3b. Further, a leaf spring 13 having one end fixed to the carriage 2 in order to hold the pivot shaft 10 displaceably in the direction of the guide surface 1b of the guide 1 fixes the other end to the pivot shaft 10. The holding member of the air pad 3c is configured by fitting a steel ball 6c fitted in a recess formed on the back surface of the air pad 3c into a recess of an adjusting screw 5c screwed into the carriage 2. As a result, the carriage 2 moves along the linear guide 1 by the air gap formed between the air pads 3a, 3b, 3c and the guide surfaces 1a, 1b, 1c.

In the above configuration, the spring constant of the coil spring 11 provided in the housing 12 is set small and the amount of deflection is set large. When the guide surface of the linear guide 1 is deformed due to the influence of the ambient temperature, the gap of the air gap formed between the air pads 3a and 3b and the guide surfaces 1a and 1b tends to change. By absorbing the deformation amount of the guide surface, the carriage 2 can be moved along the linear guide 1 while keeping the air gap constant. At this time, the thrust load changes as the coil vane 11 expands and contracts, but since the spring constant of the coil spring 11 is set to be small, the change in thrust load generated in the air pads 3a, 3b is extremely small. Therefore, the change in the gap of the air gap formed between the linear guide 1 and the air pads 3a and 3b due to this can be ignored. Further, by setting the deflection amount of the coil spring 11 to be large, a large thrust load required for high rigidity of the carriage 2 that moves the linear guide 1 can be generated in the air pads 3a and 3b of the carriage 2.

The adjustment of the air gap interval is performed by pushing and pulling the housing 12 screwed with the carriage 2 to change the deflection amount of the coil spring 11 provided in the housing 12 and load the thrust load. This can be done by varying the amount. The relative position of the carriage 2 with respect to the linear guide 1 is adjusted by pushing and pulling the adjusting screw 5a. At this time, the amount of deflection of the coil spring 11 changes, but the spring constant of the coil spring 11 is set small. In the adjustment range of the relative position of the carriage 2 with respect to the linear guide 1, the change in thrust load can be suppressed to a negligible amount, and it can be considered that the air gap does not change.

The leaf spring 13 performs positioning for the coil spring 11 having a small spring constant to generate a thrust load in a direction substantially orthogonal to the air pad 3b. Further, even if the coil spring 11 expands and contracts according to the deformation of the guide surface, the leaf spring 13 holds the coil spring 11 that engages with the pivot shaft 10, so that the housing 12 and the coil spring 11 do not come into contact with each other. There is no effect of friction. Therefore, the coil spring 11 can reliably absorb the deformation amount of the guide surface, and moreover, the thrust load generated by the coil spring 11 can be transmitted as it is. Further, since the thrust load is generated by the coil spring 11, the load stress applied to the leaf spring 13 is extremely small. The shape and material of the leaf spring 13 are not limited to those in this embodiment.

[0012]

[Effect of the device]

 As described above, according to the present invention, even if the linear guide is deformed, the air gap formed between the linear guide and the air pad can always be kept constant. Further, since the housing is screwed into the carriage, the amount of bending of the coil spring can be changed by pushing and pulling the housing. Therefore, the rigidity of the carriage can be adjusted by changing the load of the thrust load, and a highly rigid guide device can be obtained. Moreover, since the spring constant can be reduced by using the coil spring, the adjustment range of the relative position between the guide and the carriage can be widened and easily adjusted, and the adjustment time can be reduced.

For example, when the guide device is used in a three-dimensional measuring machine, the accuracy of the measuring machine can be improved.

[Brief description of drawings]

1 is a cross-sectional view of a first embodiment of a device according to the present invention.

FIG. 2 is a cross-sectional view of a device according to the prior art.

[Explanation of symbols]

 1 Linear guide 2 Carriage 7, 10 Pivot shaft 8 Disc spring 9 Adjustment screw 11 Coil spring 12 Housing 13 Leaf spring 1a, 1b, 1c Guide surface 3a, 3b, 3c Air pad 5a, 5b, 5c Adjustment screw 6a, 6b, 6c Steel ball

Claims (2)

[Scope of utility model registration request] 1. A linear guide having at least three guide surfaces, a carriage that moves along the guide, an air pad provided in correspondence with each of the guide surfaces, and a carriage that tilts the air pad. And a holding member for holding between each of the guide surfaces, and a linear guide device for moving the carriage along the guide by an air gap formed between the air pad and the guide surface, A holding member that holds one of the air pads, a housing that is provided integrally with the carriage and that is open in the direction of the guide surface corresponding to the one air pad, and an auxiliary member that holds the air pad in a tiltable manner, A first elastic member provided in the housing for applying a biasing force to the air pad through the auxiliary member; A linear guide comprising a second elastic member that is displaceable in the biasing direction of the member and that holds the auxiliary member on the carriage so as not to be displaced in a direction other than the biasing direction. apparatus. 2. A linear guide including two guide surfaces parallel to each other and at least one guide surface orthogonal to the two guide surfaces, a carriage moving along the guides, and the guide surface. And an holding member that holds the air pad tiltably between the carriage and each of the guide surfaces, and is formed between the air pad and the guide surface. In a linear guide device that moves the carriage along the guide by an air gap, a holding member that holds one of the air pads corresponding to the two guide surfaces that are parallel to each other is provided integrally with the carriage, A housing that is open in the direction of the guide surface corresponding to the air pad, an auxiliary member that tiltably holds the air pad, and the housing A coil spring that is provided in the ring and applies an urging force to the one air pad via the auxiliary member, and is displaceable in the urging direction of the first elastic member, and does not substantially displace in a direction other than the urging direction. And a leaf spring that holds the auxiliary member on the carriage as described above.