Grinding machine with movable grinding wheels

Abstract

A grinding machine includes a main part and an end case. A driving unit is connected to the end case and includes a first motor which has an output shaft with a groove. A grinding unit is connected to the end case, and cantilevered above the main part. The grinding unit includes a grinding wheel set which has a central axle with a slide. The slide is located in the groove of the output shaft of the first motor. A driving wheel is connected to the central axle. An adjustment device includes a second motor which drives an eccentric unit that has an eccentric axle, and the eccentric axle extends through a bearing which is located in a recess formed to the driving wheel. The driving wheel is driven by the eccentric unit to move the grinding wheel set of the grinding unit left and right.

Claims

1. A grinding machine comprising: a base having a main part and an end case connected to one end of the main part; a driving unit connected to the end case and including a first motor which has an output shaft, a groove formed axially in a distal end surface of the output shaft of the first motor; a grinding unit having one of two ends thereof connected to the end case, another one of the two ends of the grinding unit cantilevered above the main part, the grinding unit including a hood and a grinding wheel set, the hood being mounted above the grinding wheel set, the grinding wheel set including a central axle which has a slide, the slide being located in the groove of the output shaft of the first motor, a driving wheel connected to the central axle; an adjustment device including a second motor which is connected to an eccentric unit, the eccentric unit including an eccentric axle and a bearing, the eccentric axle extending through the bearing, and the bearing located in a recess formed to the driving wheel, and the driving wheel being driven by the eccentric unit of the adjustment device to move the grinding wheel set of the grinding unit.

2. The grinding machine as claimed in claim 1, wherein the central axle of the grinding unit defines a first axis, and the second motor of the adjustment device defines a second axis which is perpendicular to the first axis, and wherein the eccentric unit of the adjustment device is connected to the driving wheel of the grinding unit, so that the grinding unit is driven by the eccentric unit to move longitudinally along the first axis.

3. The grinding machine as claimed in claim 1, wherein the main part of the base includes two boards respectively extending toward two sides of the main part, and the base includes a feeding device connected to the main part.

4. The grinding machine as claimed in claim 1, wherein the end case includes a crank connected thereto, the end case being movably connected to two guide pillars which are fixed to the base, the end case being adjustable along the two guide pillars by rotation of the crank.

5. The grinding machine as claimed in claim 1, wherein the second motor is set to operate at a constant speed selected from variable speeds and independent of a speed of the first motor, rotational motion of the central axle being driven by the first motor, longitudinal motion of the central axle being driven by the second motor independently of the rotational motion.

6. The grinding machine as claimed in claim 1, wherein the driving wheel is formed to surround a portion of the central axle.

7. The grinding machine as claimed in claim 1, wherein the recess is formed in a circumferential surface of the driving wheel.

8. The grinding machine as claimed in claim 1, wherein the eccentric axle extends into the recess of the driving wheel.

9. The grinding machine as claimed in claim 1, wherein the bearing is configured to engage against a side surface of the recess of the driving wheel to drive movement of the grinding wheel set of the grinding unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view to show the grinding machine of the present invention;

(2) FIG. 2 is a side view of the grinding machine of the present invention;

(3) FIG. 3 is an exploded view of the grinding machine of the present invention;

(4) FIG. 4 is an enlarged view to show the grinding machine of the present invention;

(5) FIG. 5 is a side cross sectional view of the grinding machine of the present invention;

(6) FIG. 6 is a cross sectional view, taken along line X-X in FIG. 5, and

(7) FIG. 7 shows a conventional grinding machine.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(8) Referring to FIGS. 1 to 3, the grinding machine A of the present invention comprises a base 1, a driving unit 2, a grinding unit 3 and a adjustment device 4. The base 1 includes a main part 11 and an end case 12 is connected to one end of the main part 11. The base 1 includes a feeding device 13 connected to the main part 11, and the feeding device 13 uses a belt to be connected to the main part 11 so as to feed an object 8 to be ground. The main part 11 of the base 1 includes two boards 111 which are respectively and pivotably connected to the main part 11 and extend toward two sides of the main part 11. A hook 15 is connected to the base 1 so as to position a sucking hose for sucking dust from the object 8.

(9) The end case 12 includes a crank 121 connected to the top of the end case 12. The base 1 includes two guide pillars 14 which are fixed to the base 1, and the end case 12 is movable and adjusted along the two guide pillars 14 by rotating the crank 121. The height of the grinding unit 3 relative to the main part 11 is adjustable by operating the crank 121 so as to grind the objects of different thicknesses.

(10) As shown in FIGS. 2 to 6, the driving unit 2 is connected to the end case 12 and includes a first motor 21 which has an output shaft. An end part is connected to the distal end surface of the output shaft of the first motor 21, and a groove 22 defined axially in the end part.

(11) The grinding unit 3 has one of two ends thereof connected to the end case 12, and another one of the two ends of the grinding unit 3 is cantilevered above the main part 11. The grinding unit 3 includes a hood 31 and a grinding wheel set 32, wherein the hood 31 is mounted above the grinding wheel set 32. The grinding wheel set 32 includes a central axle 321 which has a slide 33. The slide 33 is located in the groove 22 of the output shaft of the first motor 21. A driving wheel 322 is connected to the central axle 321. The central axle 321 is connected to the output shaft of the first motor 21 by the slide 33 located in the groove 22 of the end part. The driving unit 2 is connected to and drives the grinding unit 3. The grinding unit 3 includes a first axis 30.

(12) The adjustment device 4 includes a second motor 41 which is connected to an eccentric unit 42. The eccentric unit 42 includes an eccentric axle 421 and a bearing 422. The eccentric axle 421 extends through the bearing 422, and the bearing 422 is located in a recess 323 formed to the driving wheel 322 as shown in FIGS. 4 and 5. The adjustment device 4 includes a second axis 40 which is perpendicular to the first axis 30. The eccentric unit 42 of the adjustment device 4 is connected to the driving wheel 322 of the grinding unit 3, so that the grinding unit 3 moves along the first axis 30 when the eccentric axle 421 is rotated. The second motor 41 is set to operate at a constant speed selected from variable speeds.

(13) Therefore, the first driver 21 drives the central axle 321 of the driving wheel 322 of the grinding unit 3 to as to operate the grinding unit 3 to grind the objects 8. The adjustment device 4 uses the bearing 422 of the eccentric unit 42 to be located in the recess 323 of the driving wheel 322 so as to move the central axle 321 of the driving wheel 322 of the grinding unit 3 left and right, such that the grinding unit 3 is movable to provide a wider or larger area of grinding to the objects 8.

(14) The grinding unit 3 is rotated to grind objects 8 by the first motor 21 driving the central axle 321. When a larger object 8 is to be ground, the second motor 41 is operated, because the eccentric unit 42 of the adjustment device 4 is connected to the driving wheel 322 of the grinding unit 3, so that the grinding unit 3 is moved left and right along the first axis 30, in the same time, because the slide 33 is restricted within the groove 22 of the end part, the grinding unit 3 is moved linearly. Therefore, the area that the grinding unit 3 grinds the object 8 is larger and wider. The cooperation between the driving unit 2 and the adjustment device 4 maintain the grinding unit 3 to be operated stably without shaking.

(15) As shown in FIG. 6, the object 8 is put on the feeding device 13, and the two boards 111 support the object 8 to be maintained horizontally, so that the result of the grinding is improved.

(16) While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.