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An automatic-positioning linear guide has a driven body combined with guiding rails at two sides of a stationary base via a plurality of rollers. Each of the rollers is composed of two bearings combined by an axial shaft and can be assembled with the corresponding guiding rail without an assembly er

An automatic-positioning linear guide has a driven body combined with guiding rails at two sides of a stationary base via a plurality of rollers. Each of the rollers is composed of two bearings combined by an axial shaft and can be assembled with the corresponding guiding rail without an assembly error therebetween.

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1. An automatic-positioning linear guide comprising: a stationary base having a pair of guiding rail sets provided at two lengthwise sides of a top surface thereof, wherein each guiding rail set has at least one guiding rail provided at one lengthwise lateral side of each guiding rail set and the at

1. An automatic-positioning linear guide comprising: a stationary base having a pair of guiding rail sets provided at two lengthwise sides of a top surface thereof, wherein each guiding rail set has at least one guiding rail provided at one lengthwise lateral side of each guiding rail set and the at least one guiding rail has a roller contacting portion laterally jutting out of each guiding rail set;a driven body mounted on the stationary base, wherein at least one roller is provided at each of two sides of a bottom surface of the driven body and each at least one roller comprises two bearings and an axial shaft combining and fastening the two bearings to the driven body, wherein two outer bushes of the two bearings jointly define an annular sliding groove at an exterior of the at least one roller to receive the roller contacting portion of the guiding rail, whereby when the two outer bushes of the two bearings contact the roller contacting portions, an axis of the two bearings deflects;at least one groove formed on the bottom surface of the driven body between the at least one roller provided at each of the two sides of the driven body; andat least one lateral pressure adjusting member provided parallel to the two sides of the driven body and perpendicularly crossing the at least one groove. 2. The automatic-positioning linear guide of claim 1, further comprising: a pair of fixing portions along the two lengthwise sides of the top surface of the stationary base; anda retaining edge formed at a point where the stationary base and each fixing portion meet allowing the guiding rail set to be fixed at the fixing portion along the retaining edge. 3. The automatic-positioning linear guide of claim 2, wherein the fixing portion is depressed from the top surface of the stationary base with an altitudinal difference between the fixing portion and the top surface of the stationary base defining the retaining edge at the point where the top surface of the stationary base and the fixing portion meet. 4. The automatic-positioning linear guide of claim 1, wherein the guiding rail set comprises a first seat and a second seat vertically aligned and a plurality of bolts passing through and fastening the first seat and the second seat to the stationary base, wherein the at least one guiding rail has a portion thereof other than the roller contacting portion retained between the first and second seats. 5. The automatic-positioning linear guide of claim 4, wherein a socket is provided at a top surface of the first seat for receiving a head of each bolt. 6. The automatic-positioning linear guide of claim 4, wherein a rail receiving portion formed as a quarter round is provided at each of two sides of the first seat and the second seat facing each other, wherein adjacent rail receiving portions jointly define a semicircular accommodating space for receiving one said guiding rail, and wherein the one said guiding rail has a portion thereof other than the roller contacting portion received in the semicircular accommodating space and retained between the first and second seats. 7. The automatic-positioning linear guide of claim 4, wherein a relative distance exists between the first seat and the second seat. 8. The automatic-positioning linear guide of claim 1, wherein a relative interval exists between the two bearings while the two bearings are respectively separated from the axial shaft for another relative interval. 9. The automatic-positioning linear guide of claim 1, wherein the axial shaft is a bolt. 10. The automatic-positioning linear guide of claim 1, further comprising another pair of guiding rail sets linked up at each of the two lengthwise sides of the stationary base, wherein adjacent guiding rail sets are spaced an extension gap. 11. The automatic-positioning linear guide of claim 1, wherein the at least one lateral pressure adjusting member comprises a bolt passing across the at least one groove and a nut fixed to the bottom surface of the driven body for receiving the bolt. 12. The automatic-positioning linear guide of claim 1, wherein two rows of said rollers are provided at each of the two sides of the bottom surface of the driven body, wherein each guiding rail set has a pair of guiding rails settled at each of the two lengthwise sides, whereby when the roller contacting portions of the pair of guiding rails combined with the annular sliding grooves of the rollers, the outer bushes of each roller contact the corresponding roller contacting portion. 13. An automatic-positioning linear guide comprising: a stationary base having a pair of guiding rail sets provided at two lengthwise sides of a top surface thereof, wherein each guiding rail set has at least one guiding rail provided at one lengthwise lateral side of each guiding rail set and the at least one guiding rail has a roller contacting portion laterally jutting out of each guiding rail set; anda driven body mounted on the stationary base, wherein at least one roller is provided at each of two sides of a bottom surface of the driven body and each at least one roller comprises two bearings and an axial shaft combining and fastening the two bearings to the driven body, wherein two outer bushes of the two bearings jointly define an annular sliding groove at an exterior of the at least one roller to receive the roller contacting portion of the guiding rail, whereby when the two outer bushes of the two bearings contact the roller contacting portions, an axis of the two bearings deflects, wherein two rows of said rollers are provided at each of the two sides of the bottom surface of the driven body, wherein each guiding rail set has a pair of guiding rails settled at each of the two lengthwise sides, whereby when the roller contacting portions of the pair of guiding rails combined with the annular sliding grooves of the rollers, the outer bushes of each roller contact the corresponding roller contacting portion, wherein a groove is formed on the bottom surface of the driven body between the two rows of said rollers and a plurality of lateral pressure adjusting members are provided on the driven body and perpendicularly cross the groove. 14. The automatic-positioning linear guide of claim 13, wherein a lateral pressure adjusting member is provided on the driven body between two adjacent rollers of the same row of rollers.