MACHINE TOOL WITH LOADING DEVICE

Abstract

The present invention relates to a machine tool for machining surfaces of in particular rotationally symmetrical workpieces (7), comprising at least one machining station (1, 2), at least one loading station (3) and/or unloading station (4) for the workpieces to be machined and/or the machined workpieces, a loading device (6) for transferring the workpieces (7) from one station (1, 2, 3, 4) to an adjacent station (1, 2, 3, 4),

characterized in that the loading device (6) comprises a rotatably driven sliding device (8), a drive (9) for the sliding device (8) and a rotatably mounted and braked guiding device (10),

wherein driving the sliding device (8) initially causes a workpiece (7) to be pressed by the sliding device (8) against the guiding device (10), after which the workpiece (7) abutting against the sliding device (8) and abutting against the braked guiding device (10) indirectly moved by the sliding device (8) is transferred onto a circular arc track from one station (1, 2, 3, 4) into an adjacent station (1, 2, 3, 4).

Claims

1. A machine tool for machining surfaces of in particular rotationally symmetrical workpieces (7), comprising at least one machining station (1, 2), at least one loading station (3) for the workpieces (7) to be machined and/or an unloading station (4) for the machined workpieces, a loading device (6) for transferring the workpieces (7) from one station (1, 2, 3, 4) to an adjacent station (1, 2, 3, 4), characterized in that the loading device (6) comprises a rotatably driven sliding device (8), a drive (9) for the sliding device (8), a rotatably mounted guiding device (10), and a brake (19) for the guiding device, wherein driving the sliding device (8) initially causes a workpiece (7) to be pressed by the sliding device (8) against the guiding device (10), after which the workpiece (7) abutting against the sliding device (8) and abutting against the braked guiding device (10) indirectly moved by the sliding device (8) is transferred onto a circular arc track from one station (1, 2, 3, 4) into an adjacent station (1, 2, 3, 4).

2. The machine tool according to claim 1, wherein the sliding device (8) and guiding device (10) each have several arms (8a, 8b, 8c, 8d and 10a, 10b, 10c, 10d).

3. The machine tool according to claim 1, wherein the sliding device (8) can be made to abut against the rotationally symmetrical workpiece (7) at exactly one punctiform or line-shaped contact place.

4. The machine tool according to claim 1, wherein the guiding device (10) has at least one arm (10a, 10b, 10c, 10d) and one receiving prism (12) mounted on the arm (10a, 10b, 10c, 10d), wherein the receiving prism (12) can be made to abut against the rotationally symmetrical workpiece (7) at exactly two punctiform or line-shaped contact place.

5. The machine tool according to claim 4, wherein the receiving prism (12) is pivotably mounted on the arm (10a, 10b, 10c, 10d) of the guiding device (10).

6. The machine tool according to claim 5, wherein the pivot bearing of the receiving prism (12) is realized by at least two oblong holes (13).

7. The machine tool according claim 1, wherein the sliding device (8) and/or guiding device (10) are set up in such a way that the workpiece (7) is lifted during a transfer.

8. The machine tool according to claim 7, wherein cams (14) are provided for generating an up and down movement of the sliding device (8) and guiding device (10).

9. The machine tool according to claim 1, wherein the at least one machining station (1, 2) comprises a centering roller (15), and wherein the centering roller (15) can be lowered.

10. The machine tool according to claim 1, wherein at least one support surface (16) for the workpiece (7) is formed between two adjacent stations (1, 2, 3, 4) during the transfer, and wherein the support surface (16) has at least one recess, in which a support element (18) fixable in different positions is arranged.

11. The machine tool according to claim 2, wherein the sliding device (8) can be made to abut against the rotationally symmetrical workpiece (7) at exactly one punctiform or line-shaped contact place.

Description

[0022] The invention as well as the technical environment will be exemplarily described below based on the figures. Shown schematically on the figures are:

[0023] FIG. 1: a top view of the machine tool, position,

[0024] FIG. 3: the top view according to FIG. 2 in a clamping position, and

[0025] FIG. 4: a vertical sectional view through the machine tool.

[0026] The machine tool shown in the figures comprises a first machining station 1, a second machining station 2, a loading station 3 and an unloading station 4, wherein the workpieces 7 to be machined are transported by means of a transport track 5 to the loading station 3, and the machined workpieces 7 are transported from the transport track 5 out of the machine tool. A stop prism 20 is provided to hold the workpieces 7 supplied from the transport track 5 in the loading station 3.

[0027] The machine tool further comprises a loading device 6, which is shown in detail and in different positions in FIGS. 2 and 3.

[0028] The loading device 6 comprises a sliding device 8 designed as a loading cross with four arms 8a, 8b, 8c, 8d. The loading device 6 further comprises a guiding device 10 likewise designed as a loading cross with four arms 10a, 10b, 10c, 10d. A slider 11 is arranged on each arm 8a, 8b, 8c, 8d of the sliding device, while a receiving prism 12 is arranged on each arm 10a, 10b, 10c, 10d of the guiding device 10. The respective receiving prism 12 is pivotably mounted on the respective arm 10a, 10b, 10c, 10d of the guiding device 10 by means of two arc-shaped oblong holes 13.

[0029] The machine tool additionally has support surfaces 16, in which recesses 17 are formed. Arranged in the recesses 17 are support elements 18, which can be fixed in various positions.

[0030] In addition, the machining stations 1 and 2 each have a centering roller 15.

[0031] As evident in particular from FIG. 4, the sliding device 8 is actively driven by means of a drive 9, while the rotatably mounted guiding device 10 is passively braked by means of a brake 19, for example one designed as a disc spring brake. Cams 14 can be formed between the guiding device 10 and a sleeve surrounding the drive shaft of the drive 9, which cause an up and down movement of the sliding device 8 and guiding device 10 during the rotational movement.

[0032] Now shown on FIG. 2 is a loading position of the loading device 6, in which the arms 8a, 8b, 8c, 8d with their sliders 11 or the arms 10a, 10b, 10c, 10d with their receiving prisms 12 are spaced apart from the respective workpiece 7. In order to grip the workpieces 7, exclusively the sliding device 8 is now driven by means of the drive 9, as a result of which the respective workpiece 7 is initially pressed by the slider 11 of the respective arm 8a, 8b, 8c, 8d against the receiving prism 12 of the respective arm 10a, 10b, 10c, 10d of the guiding device 10. The slider 11 and respective prism 12 define three punctiform or linear abutment places, so that the workpiece 7 is definitely clamped. An additional drive of the sliding device 8 transfers the respective workpiece 7 counterclockwise on a circular arc track into the next station, wherein the sliding device 8 and guiding device 10 are together moved up and down by the cams 14 running one over the other, as a result of which the workpieces 7 are raised, and hence lifted via the centering rollers 15.

[0033] Alternatively, it would be possible to lower the centering rollers 15 while transferring the workpieces.

[0034] While transferring the workpieces 7 to adjacent stations, the guiding device 10 is only indirectly driven by the sliding device 8, wherein the braking force caused by the brake 19 is overcome. After the drive 9 by the sliding device 8 has ended, the guiding device 10 remains in its position previously prescribed by the sliding device 8.

[0035] After reaching the next station, the sliding device 8 is driven in opposite directions, so that the workpieces 7 are released. After the workpieces 7 have been machined in the machining stations 1 and 2, a new loading and unloading process follows.

[0036] The present invention enables an easy transfer of the workpieces from one station to an adjacent station with short setup times.

REFERENCE LIST

[0037] 1 First machining station [0038] 2 Second machining station [0039] 3 Loading station [0040] 4 Unloading station [0041] 5 Transport track [0042] 6 Loading device [0043] 7 Workpiece [0044] 8 Sliding device [0045] 8a, 8b, 8c, 8d Arms [0046] 9 Drive [0047] 10 Guiding device [0048] 10a, 10b, 10c, 10d Arms [0049] 11 Slider [0050] 12 Receiving prism [0051] 13 Oblong hole [0052] 14 Cam [0053] 15 Centering roller [0054] 16 Support surface [0055] 17 Recess [0056] 18 Support element [0057] 19 Brake [0058] 20 Stop prism