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A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising a power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the power source. The grinding device further comprises two pair of first

A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising a power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the power source. The grinding device further comprises two pair of first grinding and second grinding seats, each pair of first and second grinding seats being disposed close to the respective grinding wheels at both ends of the driving shaft, a clamping assembly for clamping a drill bit to support the drill bit upon sequential insertion into one pair of the first and second grinding seats, and a positioning device being disposed on a front surface of the base for providing alignment of the drill bit within the clamping assembly prior to the insertion of the drill bit into one pair of the first and second grinding seats. The power source is a pneumatic motor and is provided with a vacuum passage for facilitating dust discharge.

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What is claimed is: 1. A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising: a motive power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the motive power source; a pair of sets of

What is claimed is: 1. A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising: a motive power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the motive power source; a pair of sets of first and second grinding seats, each set of first and second grinding seats being disposed adjacent a respective grinding wheel at both ends of the driving shaft, each set of seats including a clamping assembly for clamping a drill bit to support the drill bit upon sequential insertion into one set of the first and second grinding seats, and each set of seats including a positioning device being disposed on a front surface of the base for providing alignment of the drill bit within the clamping assembly prior to the insertion of the drill bit into one set of the first and second grinding seats. 2. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein each first grinding seat includes a base member, a slide slot is defined in a bottom plate of the base member, at the other end of the bottom plate of the base member is formed a pivoting portion to be fixed on the base, so that the base member is rotatable around the pivoting portion, an eccentric rotating seat is mounted in a socket in a vertical wall of the base member, and positioning pins are formed on a vertical surface of the rotating seat for cooperating with the clamping assembly, the rotating seat is further provided with a limit portion located opposite the vertical wall of the base member, and opposite limit pins are correspondingly formed on the base member. 3. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein the pivoting portion of the base member of each first grinding seat is inserted on a pivoting point of the base to perform compensating displacement around a deflection axis point A' and can move the deflection point while the assembling portion of the base member is kept in the vertical portion of the base member. 4. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein a deflection member is disposed between the rotating seat and the clamping assembly. 5. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 4, wherein the deflection member is defined with an inner space for insertion of the clamping assembly, the defection member has a large-diameter flange formed at one end thereof and a small-diameter mounting portion formed at the other end thereof, the mounting portion is concentric with the center of the rotating seat, the inner space is shaped in the form of a slant socket. 6. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 5, wherein the inner space of the deflection member is located eccentrically to the center of the mounting portion according to different lengths of the cutting edges, so that the grinding wheel can grind the drill bit with two cutting edges of different lengths. 7. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein the motive power source is a pneumatic motor, with one end of the pneumatic motor being an air-intake end, and the other end being an air-discharge end. 8. The double-grinding-wheel type drill bit grinding device with a single driving shaft and as claimed in claim 7, wherein vacuum passage is defined in the base and located at the position of the pneumatic motor, wherein open ends of the vacuum passage are located at the two grinding wheels. 9. The double-grinding-wheel type drill bit grinding device with a single driving shaft and as claimed in claim 1, wherein a large storing member in the form of a drawer is disposed in an inner space at the bottom of the base, and in the storing member is disposed a holding rack. 10. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein a backside grinding surface of the grinding wheel is shaped in the form of an inward-slanting sharp angle and is maintained at 0-5 degrees with respect to a plane parallel to the backside surface. 11. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 1, wherein a deflection member is disposed between the base member and the rotating seat. 12. A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising: a motive power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the motive power source, a pair of sets of first and second grinding seats, each set of first and second grinding seats being disposed adjacent a respective grinding wheel at both ends of the driving shaft, each set of seats including a clamping assembly for clamping a drill bit to support the drill bit upon sequential insertion into one set of the first and second grinding seats, and each set of seats including a positioning device being disposed on a front surface of the base for providing alignment of the drill bit within the clamping assembly prior to the insertion of the drill bit into one set of the first and second grinding seats; each first grinding seat includes a base member and an eccentric rotating seat that is mounted in a first assembling portion in the form of a socket in a vertical wall of the base member, the rotating seat is also formed with a second assembling portion in the form of a socket for mounting the clamping assembly, wherein a contact point along an axis of the drill bit at the center of the clamping assembly with respect to the surface of the grinding wheel is a central cutting point C, a point of the central cutting point C projected onto a vertical surface of the base member is a horizontal-axis point C', a center of the second assembling portion of the rotating seat deflects downward to form an eccentric axis point A, the first assembling portion of the base member is in the form of a slant socket and is provided with a horizontal deflection axis point A', a first deflection axis CA' of the rotating seat on the base member is deflectable within a defection angle of-10 to 10 degrees relative to a reference axis CC', and a second deflection axis CA of the second assembling portion of the rotating seat is also deflectable at an vertical deflection angle 0-5 degrees with respect to the reference axis CC'. 13. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 12, wherein a center of a sharp end of the drill bit is an apex, the drill bit is provided with two straight blade edges that extend in opposite directions from the apex, respectively to form an arc-shaped cutting extension, at an end of the cutting extension is formed a bevel, and a debris removing chute is formed adjacent to the bevel, the bevel extends to the apex to form a cutting blade edge along the blade edge, wherein the first grinding seat is used to grind the blade edges and the cutting extensions, and the second grinding seat serves to grind the bevel and the cutting blade edge, when the rotating seat of each first grinding seat rotates on the base member to drive the clamping assembly and the drill bit, the center of the sharp end of the drill bit is positioned at the central cutting point C, and the drill bit rotates eccentrically about a combined deflection axes of the first and second assembling portions when rotating on the rotary seat of the base member during grinding operation, the clamping assembly and the drill bit is allowed to deflect a distance along the first and second deflection axes CA' and CA and about the reference axis CC', so that the peripheral surfaces of the sharp end of the drill bit can be processed simultaneously by the two deflection axes to produce different curvatures and arc-shaped surfaces at the sharp end of the drill bit, the rotation of the drill bit about the combined deflection axes of the first and second assembling portions a second arc-shaped side line M'N' is formed, during the rotation of the drill bit, the apex and the central cutting point C of the drill bit are fixed, only part of the cutting extension is unequally ground at a high speed, the amount of deflection of the first deflection axis CA' relative to the reference axis CC' is within 0-10 degrees, whereas, when drill bit deflects, the cutting extension will move toward the surface of the grinding wheel to increase the grinding depth, so that the curvature of the second arc-shaped side line M'N' is relatively large. 14. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 13, when the first deflection axis CA' is located at a negative angle with respect to the reference axis CC', the grinding amount of the cutting extension reduces, a second arc-shaped side line M'N' is relatively flat, a supporting force of the blade edges is relatively large, and the strength of the drill bit increases and is suitable for grinding or cutting a work piece with a relatively high hardness. 15. A double-grinding-wheel type drill bit grinding device with a single driving shaft comprising: a motive power source disposed on a base, two grinding wheels being disposed at opposite ends of the single driving shaft extending out of the motive power source, a pair of sets of first and second grinding seats, each set of first and second grinding seats being disposed adjacent a respective grinding wheel at both ends of the driving shaft, each set of seats including a clamping assembly for clamping a drill bit to support the drill bit upon sequential insertion into one set of the first and second grinding seats, and each set of seats including a positioning device being disposed on a front surface of the base for providing alignment of the drill bit within the clamping assembly prior to the insertion of the drill bit into one set of the first and second grinding seats; the second grinding unit includes a base member to be positioned on a supporting member, one end of the base member is pivotally connected to the supporting member by a bolt, and the other end of the base member is provided with a bolt to be inserted and positioned in the supporting member, a central shaft of a cam-controlling element is provided with an abutting member in a form of a cam. 16. The double-grinding-wheel type drill bit grinding device with a single driving shaft as claimed in claim 15, wherein the supporting member extends vertically from a bottom of the base member.