Abstract
The present disclosure relates to a gripper device which comprises: a belt pulley driven by a power-driven motor; a belt and another belt pulley driven by the above belt pulley; a ball screw driven and rotated by the belt pulley; nut brackets driven to be shifted along two rigid guideways by two reverse threads at both sides of the ball screw, respectively; a plurality of steel balls, which are installed between a nut bracket and a rigid guideway and sustain more stresses when a workpiece is clamped between two upper slide on the nut brackets.
Claims
1. A gripper device, comprising: a belt pulley driven by a transmission shaft of a power-driven motor fixed on a first anchor plate clockwise or counterclockwise; a belt and another belt pulley, both of which are driven by said above belt pulley; a ball screw is driven and rotated by said belt pulley fixed on said ball screw; two ball nuts, which are accommodated inside two nut brackets and driven by two reverse threads at both sides of said ball screw, respectively, wherein said ball nut regulated by a packing nut is limitedly shifted in the same axial direction of said ball screw; said nut brackets shifted along two rigid guideways; said rigid guideways securely installed between a first anchor plate and a second anchor plate; and a plurality of steel balls, which are accommodated between said nut bracket and said rigid guideway and sustain more stresses when a workpiece is clamped between two upper slide sockets on said nut brackets; wherein said nut bracket comprises two steel ball grooves in which said steel balls are accommodated.
2. The gripper device as claimed in claim 1, comprising a plurality of guard strips mounted at both sides of said nut bracket.
3. The gripper device as claimed in claim 2 wherein said steel balls do not contact with said guard strips directly.
4. The gripper device as claimed in claim 1 wherein each of said rigid guideways comprises two guideway areas and a blockage area between said guideway areas.
5. The gripper device as claimed in claim 1, comprising a ball bearing between said packing nut and said first anchor plate.
6. The gripper device as claimed in claim 1, comprising a ball bearing between said packing nut and said second anchor plate.
7. The gripper device as claimed in claim 1 wherein said steel balls are stably shifted along said rigid guideway with a retention slot on said first anchor plate and said retention slot on said second anchor plate abutting said rigid guideway.
8. The gripper device as claimed in claim 1, comprising a dustproof shell which prevents the ball screw from being pollution.
9. The gripper device as claimed in claim 1 wherein said upper slide sockets match a plurality of fixture blocks to clamp a workpiece stably.
Description
BRIEF DESCRIPTIONS OF THE DRAWINGS
(1) FIG. 1 is a schematic perspective view of a gripper device in a preferred embodiment;
(2) FIG. 2 is an exploded perspective view of a gripper device in a preferred embodiment;
(3) FIG. 3a is a first side view of a gripper device in a preferred embodiment;
(4) FIG. 3b is a schematic view of a motor assembled in a gripper device in a preferred embodiment;
(5) FIG. 3c is a schematic view of a ball screw assembled in a gripper device in a preferred embodiment;
(6) FIG. 3d is a first top view of a gripper device in a preferable embodiment;
(7) FIG. 4a is a schematic view of a belt pulley in a gripper device in a preferable embodiment;
(8) FIG. 4b is a schematic cross-sectional view of a ball screw in a gripper device in a preferable embodiment;
(9) FIG. 5a is a schematic view for steel balls mounted on a gripper device in a preferable embodiment;
(10) FIG. 5b is a first schematic cross-sectional view of steel balls in a gripper device in a preferable embodiment;
(11) FIG. 5c is a second schematic cross-sectional view of steel balls in a gripper device in a preferable embodiment;
(12) FIG. 6a is a first schematic view of a rigid guideway in a gripper device in a preferable embodiment;
(13) FIG. 6b is a second schematic view of a rigid guideway in a gripper device in a preferable embodiment;
(14) FIG. 7 is a schematic view of a rigid guideway fixed in a gripper device in a preferable embodiment;
(15) FIG. 8 is a schematic view of a workpiece clamped with a gripper device in a preferable embodiment.
DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENTS
(16) A gripper device is explained in the preferred embodiments for a clear understanding of purposes, characteristics and effects of the present disclosure.
(17) Referring to FIG. 3a for the first embodiment, which illustrates a gripper device comprising a power-driven motor (10), two belt pulleys (11, 11′), a belt (12) and a ball screw (13) for transmission of the driving force.
(18) Moreover, referring to FIG. 3a, which illustrates the power-driven motor (10) is fixed in a first anchor plate (30); referring to FIG. 3b, which illustrates one belt pulley (11) is driven by a transmission shaft of the power-driven motor (10) clockwise or counterclockwise; referring to FIG. 4a, which illustrates the belt (12) and the other belt pulley (11′) are also driven by the belt pulley (11); referring to FIG. 3c, which illustrates the ball screw (13) is driven and rotated by the belt pulley (11′) fixed on the ball screw (13).
(19) In specific, the first anchor plate (30) that is a laminar structure on which components are fixed comprises a plurality of holes and/or grooves (for example, retention slots 301 in FIG. 7) for installations of relevant components; the power-driven motor (10) also known as an electric motor is an electric device transforming power energy to mechanical energy with which kinetic energy is generated for driving other facilities; the belt pulleys (11, 11′) correspondingly installed on a high-precision positioning mechanism for reduced counterforce are adequate to high-speed low-torque transmission which is enabled by frictional forces between the belt pulleys (11, 11′) and the belt (12) made of elastic and tenacious materials for noise-free transmission in contrast to a chain or gears; the belt (12) which is an elastic component generates low noise during transmission such that a machine sustains low vibrations; the ball screw (13) featuring its cylindrical surface with concavo-convex spiral threads usually is able to transform the screw movement to the linear movement for generations of linear forces induced by torques and transmissions of acting forces which are magnified axially by smaller rotary forces (from torques) applied on a shaft.
(20) As shown in FIG. 4b, the ball screw (13) comprises two reverse threads (131, 131′) thereon, which are a right-handed thread and a left-handed thread, respectively; accordingly, a distance between components mounted on the ball screw (13) is controlled by the rotary ball screw (13).
(21) Moreover, referring to FIGS. 4b and 5b, which illustrate a gripper device comprises two nut brackets (20, 20′), two ball nuts (21, 21′), two packing nuts (22), two rigid guideways (24), a plurality of steel balls (25), two upper slide sockets (26, 26′) and a plurality of guard strips (27) for clamping a workpiece.
(22) As shown in FIG. 4b, the two ball nuts (21, 21′) in the two nut brackets (20, 20′) are driven by the two reverse threads (131, 131′) at opposite sides of the ball screw (13), which has been rotating, respectively. Moreover, referring to FIGS. 2 and 5b, which illustrate that the ball nut (21) regulated by a packing nut (22) is limitedly shifted in the same axial direction (X) of the ball screw (13) and the nut brackets (20, 20′) are shifted along two rigid guideways (24). When a workpiece (0) has been clamped by the two upper slide sockets (26, 26′) on the nut brackets (20, 20′) (as shown in FIG. 8), a plurality of steel balls (25) between the nut bracket (20) and the rigid guideway (24) sustain stresses (as shown in FIG. 5b).
(23) In general, the nut bracket (20, 20′) has a through hold space in which both the ball nut (21,21′) and the packing nut (22) are accommodated and the packing nut (22) is locked, carries the upper slide socket (26, 26′) thereon, and features a block-shaped structure on which components are fixed and a plurality of holes and/or grooves for accommodations of the components are opened; the ball nut (21, 21′) is provided with steel balls return part with which the screw movement is transformed to the linear movement; the packing nut (22) locked in the nut bracket (20, 20′) is able to limited shifts of the ball nut (21, 21′); the rigid guideway (24) on which an object is limitedly moved and shifted along a predetermined path undergoes thermal treatment for better rigidity to sustain an object's weight and/or stresses and is fixed between the first anchor plate (30) and the second anchor plate (31) (FIG. 7); the second anchor plate (31) that is a laminar structure on which components are fixed comprises a plurality of holes and/or grooves (for example, retention slots 311 in FIG. 7) for installations of components.
(24) Preferably, the nut bracket (20) comprises two steel ball grooves (201), each of which accommodates the steel balls (25) (FIG. 5a) for better stability of the steel balls (25) between a rigid guideway (24) and the nut bracket (20). Moreover, a plurality of guard strips (27) installed at both sides of the nut bracket (20) additively (FIG. 5b) do not contact with the steel balls (25) directly for no slip-off of the steel balls (25); two ball bearings (23) installed additively are located between the packing nut (22) and the first anchor plate (30) and between the other packing nut (22) and the second anchor plate (31), respectively (FIG. 4b). The steel balls (25) can be stably shifted along the rigid guideways (24) with a retention slot (301) on the first anchor plate (30) and a retention slot (311) on the second anchor plate (31) abutting the rigid guideways (24) (FIG. 7). Additionally, a dustproof shell (28) mounted additively prevents the ball screw (13) from being pollution (FIG. 3a); the upper slide sockets (26, 26′) match a plurality of fixture blocks (261, 261′) for clamping a workpiece (0) steadily (FIG. 8); the fixture blocks (261, 261′) are axillary components matching and fixing a workpiece (0).
(25) Referring to FIGS. 5c and 6b, which illustrate a gripper device in the second embodiment in which the characteristics identical to those of the first embodiment in FIGS. 1, 2, 3a, 3b, 3c, 3d, 4a, 4b, 5a, 5b, 5c, 6a, 7 and 8 are not explained hereinafter. The differences in the second embodiment differing from the first embodiment are: the rigid guideways (24) in the first embodiment are replaced; the guard strips (27) are moved.
(26) As shown in FIG. 3a, the power-driven motor (10) is fixed on the first anchor plate (30) and one belt pulley (11) is driven by a transmission shaft of the power-driven motor (10) clockwise or counterclockwise. Moreover, referring to FIG. 4a, which illustrates the belt (12) and the other belt pulley (11′) are also driven by the belt pulley (11); referring to FIG. 3c, which illustrates the ball screw (13) is driven and rotated by the belt pulley (11′) fixed on the ball screw (13).
(27) As shown in FIG. 4b, the two ball nuts (21, 21′) in the two nut brackets (20, 20′) are driven by the two reverse threads (131, 131′) at opposite sides of the ball screw (13), which has been rotating, respectively. Moreover, referring to FIGS. 2 and 5b, which illustrate that the ball nut (21) regulated by a packing nut (22) is limitedly shifted in the same axial direction (X) of the ball screw (13) and the nut brackets (20, 20′) are shifted along two rigid guideways (24). When a workpiece (0) has been clamped by the two upper slide sockets (26, 26′) on the nut brackets (20, 20′) (as shown in FIG. 8), a plurality of steel balls (25) between the nut bracket (20) and a rigid guideway (24) sustain stresses (as shown in FIG. 5b).
(28) Furthermore, the rigid guideway (24) comprises two guideway areas (241) and a blockage area (242) between the guideway areas (241) (FIG. 6b): the guideway area (241) is used to regulate movement of an object thereon within a predetermined path; the blockage area (242) prevents an object from being moved beyond the guideway area (241).
(29) As show n in previous embodiments, a plurality of steel balls (25) are accommodated between a rigid guideway (24) and a nut bracket (20) such that the upper slide sockets (26, 26′) between which a workpiece (0) is clamped sustain more stresses. Accordingly, a gripper device which is different from an ordinary gripper and referred to as creative work in applications meets patentability and is applied for the patent.
(30) It should be reiterated that the above descriptions present the preferred embodiments, and any equivalent changes in specifications, claims or drawings still belongs to the technical field within the present disclosure with reference to claims hereinafter.
