Device for grinding and deburring a flat workpiece

Abstract

A device for grinding and deburring a flat workpiece comprise a grinding roller having an abrasive coating. A coaxial drive shaft that is connected rotation-fast to the guide roller is driven by a drive motor via a primary belt drive. The grinding roller is borne axially displaceable on the drive shaft. Via a second secondary belt drive, the drive motor drives a cam mechanism, comprising a control cylinder that is rotatably borne on the drive shaft of the grinding roller and that has a groove cam and comprising a cam slide arranged on the grinding roller. The rotating grinding roller thus performs an oscillating axial back-and-forth movement.

Claims

1. Device for grinding and deburring a flat workpiece, comprising: a grinding roller having an abrasive coating configured for abrading the workpiece; a drive shaft that is connected rotation-fast to the grinding roller and on which the grinding roller is axially displaceable; a drive motor for driving the grinding roller; a cam mechanism coupled to the drive motor, the cam mechanism producing an oscillating back-and-forth movement of the grinding roller on the drive shaft, the cam mechanism comprising a control cylinder that is rotatably disposed on the drive shaft; the control cylinder having a groove and the grinding roller having a cam that travels in the groove; and first and second belt drives that are driven by the drive motor, the first belt drive driving the drive shaft and the second belt drive driving the control cylinder.

2. Device in accordance with claim 1, wherein the groove has a sinusoidal shape.

3. Device in accordance with claim 1, wherein an end face of the grinding roller has a cylindrical recess in which the control cylinder is coaxially arranged.

4. Device in accordance with claim 1, wherein the grinding roller comprises hollow cylinder and an axial guide slit is arranged in an interior wall of the hollow cylinder, the drive shaft having a cam roller that engages in the guide slit.

5. Device in accordance with claim 1, further comprising a plain bearing arranged between the drive shaft and the grinding roller.

6. Device in accordance with claim 1, further comprising a connecting shaft that couples the second belt drive to the first belt drive.

7. Device in accordance with claim 1, wherein the first belt drive comprises a belt pulley seated on the drive shaft.

8. Device in accordance with claim 1, wherein the second belt drive comprises a belt pulley connected to the control cylinder.

9. Device in accordance with claim 1, wherein the first and second belt drives have different transmission ratios, whereby the drive shaft and the control cylinder rotate at different speeds.

10. Device in accordance with claim 1, wherein the first and second belt drives are arranged adjacent to one another on one end of the drive shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above-mentioned aspects of exemplary embodiments will become more apparent and will be better understood by reference to the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

(2) FIG. 1 depicts a highly simplified vertical section of a deburring machine;

(3) FIG. 2 depicts an enlargement of the area A from FIG. 1.

(4) Only the essential parts of the deburring machine are shown in the figures if these parts are necessary for understanding this disclosure.

DESCRIPTION

(5) The embodiments described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following description. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of this disclosure.

(6) A grinding roller 2 is rotatably borne about its horizontal axis in a machine stand 1. The grinding roller 2 is seated coaxially on a drive shaft 3 that is rotatably borne using two roller bearings 4a, 4b in the machine stand 1. The two roller bearings 4a, 4b are arranged a slight distance from one another. A third roller bearing (not shown) is disposed at the free end of the drive shaft 3 (to the right in FIG. 1), wherein this third roller bearing can be detached from the drive shaft 3 by swinging it away so that the grinding roller 2 is temporarily borne in a floating manner, as shown here.

(7) An abrasive coating 5 for abrading a flat workpiece 6 is arranged on the cylindrical exterior of the grinding roller 2. The abrasive coating 5 in this case is embodied as an infinite cylindrical tube and may be placed axially onto the grinding roller 2 from the end of the drive shaft 3 and removed in the reverse manner. For removing burrs on the essentially flat top side of the workpiece 6, the latter is moved horizontally under the rotating grinding roller 2.

(8) The grinding roller 2 is driven by a drive motor 7, a strong electric motor. Its motor shaft 8 is also borne horizontally in the machine stand 1. The drive motor 7 drives the drive shaft of the grinding roller 2 via a first primary belt drive 9. The belt drive 9 includes a lower belt pulley 10, an upper belt pulley 11 that is seated on the drive shaft 3 of the grinding roller 2, and a drive belt 12 guided via the belt pulleys 10, 11.

(9) The drive shaft 3 is connected rotation-fast (rotation locked) to the grinding roller 2. At the same time, the grinding roller 2 is borne axially displaceable on the drive shaft 3. This is realized using two axial guide slits 13a, 13b on the cylindrical interior of the grinding roller 2, which is embodied as a hollow cylinder, and two corresponding cam rollers 14a, 14b, that are seated on the drive shaft 3 and engage in the guide slits 13a, 13b. A plain bearing 15 (FIG. 2) is arranged between drive shaft 3 and grinding roller 2, so that the grinding roller 2 can easily glide back and forth axially on the drive shaft 3 as far as the relative movement of the cam rollers 14a, 14b in the guide slits 13a, 13b permits. The cam rollers 14a, 14b function as carriers that transfer the rotational movement of the drive shaft 3 to the grinding roller 2.

(10) Not only does the drive motor 7 permit the grinding roller 2 to rotate, but it also effects an oscillating back-and-forth movement of the grinding roller 2 relative to the drive shaft 3. To this end, a second secondary belt drive 16 is provided. This belt drive 16 includes an upper belt pulley 17 and a lower belt pulley 18 via which a drive belt 19 runs. A connecting shaft 20 is rotatably borne horizontally and thus parallel to the drive shaft 3 and to the motor shaft 8 in the machine stand 1. The lower belt pulley 18 is seated on the one end of the connecting shaft 20 (in the figure, this is the right end). Another belt pulley 21 is seated on the opposing end of the connecting shaft 20, approximately in the center between the lower belt pulley 10 and the upper belt pulley 11 of the primary belt drive 9, wherein these three belt pulleys 10, 11, 21 lie in one plane. The drive belt 12 of the primary belt drive 9 is guided via the center belt pulley 21 and thus transmits the rotational movement of the drive motor 7 to the connecting shaft 20 and the secondary belt drive 16 coupled thereto.

(11) At its end face opposing its free end (in FIG. 1 this is the left end), the grinding roller 2 has a large cylindrical recess. A control cylinder 23, also cylindrical, is seated nearly completely in the recess 22 and is borne by means of roller bearings 24a, 24b on the drive shaft 3 of the grinding roller 2 such that it can rotate freely on the drive shaft 3. A groove cam 25 having an approximately rectangular cross-section is inserted into the lateral surface of the control cylinder 23. As may be seen especially in the enlargement in FIG. 2, a corresponding cam slide 26 is arranged on a cylindrical inner wall of the grinding roller 2 and engages in the groove cam 25 of the control cylinder 23. The cam slide 26 is embodied as a cam roller to reduce the friction between groove cam 25 and cam slide 26.

(12) The upper belt pulley 17 of the secondary belt drive 16 is flange-connected at the free end face of the control cylinder 23 (the left end face in FIGS. 1 and 2). Thus not only does the drive motor 7 drive the grinding roller 2, but it also, via the secondary belt drive 16, causes the control cylinder 23 to rotate coaxially with the grinding roller 2 and its drive shaft 3. The speed at which the control cylinder 23 rotates on the drive shaft 3 is not the same, however, as the speed at which the grinding roller 2 rotates about its axis. Since the two belt drives 9 and 16 have different transmission ratios, the drive shaft 3 and the grinding roller 2 connected rotation-fast thereto and the control cylinder 23 rotate at different speeds.

(13) The groove cam 25 runs in a sinusoidal shape on the lateral surface of the control cylinder 23. Observed over one complete rotation, the groove cam 25 moves back and forth between the right and the left edges of the control cylinder 23, as indicated in FIG. 1 with a double arrow. The cam slide 26 follows this axial oscillating movement axially and thereby transmits the excursion of the groove cam 25 to the grinding roller 2 so that not only does the latter rotate about it axis, but at the same time it performs an oscillating axial back-and-forth movement.

(14) The cam slide 26 travels one period of the sinusoidal groove cam 25 per rotation of the control cylinder 23. The number of back-and-forth movements by the grinding roller 2 depends on the rotational speed of the control cylinder 23 relative to the rotational speed of the grinding roller 2. The grinding roller 2 runs significantly faster than the control cylinder 23. For instance, the speed of the grinding roller is 1,000 rpm (16 per second), while the oscillation frequency is 2/sec. The oscillation frequency is very simple to adjust using the selection of the transmission ratio for the two belt drives 9 and 16 and in particular the ratio of the diameters of the belt pulleys 17, 18 of the secondary belt drive 16.

(15) While exemplary embodiments have been disclosed hereinabove, the present invention is not limited to the disclosed embodiments. Instead, this application is intended to cover any variations, uses, or adaptations of this disclosure using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

REFERENCE LIST

(16) 1 Machine stand 2 Grinding roller 3 Drive shaft 4a, 4b Roller bearing 5 Abrasive coating 6 Workpiece 7 Drive motor 8 Motor shaft 9 Primary belt drive 10 Lower belt pulley (of 9) 11 Upper belt drive (of 9) 12 Drive belt (of 9) 13a, 13b Guide slits (in 2) 14a, 14b Cam rollers (on 3) 15 Plain bearing 16 Secondary belt drive 17 Upper belt pulley (of 16) 18 Lower belt pulley (of 16) 19 Drive belt (of 16) 20 Connecting shaft 21 Belt pulley (on 20) 22 Recess (in 2) 23 Control cylinder 24a, 24b Roller bearing (of 23) 25 Groove cam (in 23) 26 Cam slide (on 2)