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A position adjusting device includes a support frame, two adjusting assemblies, and two distance detecting mechanisms. The support frame has a first assembly portion and a second assembly portion substantially parallel to the first assembly portion. The adjusting assemblies are slidably positioned o

A position adjusting device includes a support frame, two adjusting assemblies, and two distance detecting mechanisms. The support frame has a first assembly portion and a second assembly portion substantially parallel to the first assembly portion. The adjusting assemblies are slidably positioned on the second assembly portion. The distance detecting mechanisms are slidably positioned on the first assembly portion, and each of the two distance detecting mechanisms is connected to one adjusting assembly.

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1. A position adjusting device for adjusting a position of a workpiece, comprising: a support frame;two adjusting assemblies slidably positioned on the support frame and connected to the workpiece; andtwo distance detecting mechanisms slidably positioned on the support frame and connected to the two

1. A position adjusting device for adjusting a position of a workpiece, comprising: a support frame;two adjusting assemblies slidably positioned on the support frame and connected to the workpiece; andtwo distance detecting mechanisms slidably positioned on the support frame and connected to the two adjusting assemblies, respectively;wherein the two distance detecting mechanisms detect a distance between an edge of the workpiece and the distance detecting mechanisms, thereby deciding an adjusting length of the adjusting assemblies. 2. The position adjusting device of claim 1, wherein the support frame comprises a first assembly portion and a second assembly portion substantially parallel to the first assembly portion; the position adjusting device further comprises two slide assemblies positioned on the support frame, each slide assembly comprises a first sliding member and a second sliding member; the distance detecting mechanisms are slidably positioned the first assembly portion via the first sliding members, and the adjusting assemblies are slidably positioned on the second assembly portion via the second sliding members. 3. The position adjusting device of claim 2, wherein the first assembly portion defines a first assembly groove; the first sliding member comprises a slide portion and a support portion formed on the slide portion, the slide portion is received in the first assembly groove, and the support portion is connected to the distance detecting mechanism. 4. The position adjusting device of claim 3, wherein the support portion defines a positioning groove, and the distance detecting mechanism forms an engaging portion received in the positioning groove. 5. The position adjusting device of claim 2, wherein the second assembly portion axially defines a first sliding groove and a second sliding groove; each second sliding member comprises a slide portion and a support portion formed on the slide portion; the slide portion of one second sliding member is received in the first sliding groove, and the slide portion of the other second sliding member is received in the second sliding groove; the support portions of the second sliding members are connected to the adjusting assemblies. 6. The position adjusting device of claim 5, wherein the support portion of each second sliding member defines a connecting groove; and each adjusting assembly comprises a main body having a connecting protrusion received in the connecting groove of the second sliding member. 7. The position adjusting device of claim 6, wherein each of the slide assemblies further comprises a connecting member connecting the adjusting assembly to the first sliding member. 8. The position adjusting device of claim 7, wherein the main body axially defines a threaded hole; and the adjusting assembly further comprises an adjusting pole extending through the threaded hole. 9. The position adjusting device of claim 8, wherein the adjusting pole forms a resisting end, and the resisting end is magnetic for absorbing the workpiece. 10. A position adjusting device, comprising: a support frame having a first assembly portion and a second assembly portion substantially parallel to the first assembly portion;two adjusting assemblies slidably positioned on the second assembly portion; andtwo distance detecting mechanisms slidably positioned on the first assembly portion, and each of the two distance detecting mechanisms connected to one adjusting assembly. 11. The position adjusting device of claim 10 further comprising two slide assemblies positioned on the support frame, wherein each slide assembly comprises a first sliding member and a second sliding member; the distance detecting mechanisms are slidably positioned the first assembly portion via the first sliding members, and the adjusting assemblies are slidably positioned on the second assembly portion via the second sliding members. 12. The position adjusting device of claim 11, wherein the first assembly portion defines a first assembly groove; the first sliding member comprises a slide portion and a support portion formed on the slide portion, the slide portion is received in the first assembly groove, and the support portion is connected to the distance detecting mechanism. 13. The position adjusting device of claim 12, wherein the support portion defines a positioning groove, and the distance detecting mechanism forms an engaging portion received in the positioning groove. 14. The position adjusting device of claim 11, wherein the second assembly portion axially defines a first sliding groove and a second sliding groove; each second sliding member comprises a slide portion and a support portion formed on the slide portion; the slide portion of one second sliding member is received in the first sliding groove, and the slide portion of the other second sliding member is received in the second sliding groove; the support portions of the second sliding members are connected to the adjusting assemblies. 15. The position adjusting device of claim 14, wherein the support portion of each second sliding member defines a connecting groove; and each adjusting assembly comprises a main body having a connecting protrusion received in the connecting groove of the second sliding member. 16. The position adjusting device of claim 15, wherein each of the slide assemblies further comprises a connecting member connecting the adjusting assembly to the first sliding member. 17. The position adjusting device of claim 16, wherein the main body axially defines a threaded hole; and the adjusting assembly further comprises an adjusting pole extending through the threaded hole. 18. The position adjusting device of claim 17, wherein the adjusting pole forms a resisting end, and the resisting end is magnetic.