BIT HOLDER FOR A MAGNETISABLE SCREWDRIVER BIT, DEVICE FOR THE AUTOMATED MANUFACTURE OF SCREW CONNECTIONS AND PROCEDURE FOR THE OPERATION OF A DEVICE FOR THE AUTOMATED MANUFACTURE OF SCREW CONNECTIONS

Abstract

A device is provided for the automated manufacture of screw connections. A jointed arm robot has an output element and an end link. The output element is arranged on the end link so as to be rotatable around an effector axis (wE). A screwdriving tool is rotatable around the effector axis (wE) by the output element. The device features at least one transmission operatively connected to the output element and the screwdriving tool, and transmits a speed between the output element and the screwdriving tool.

Claims

1. A bit holder for a magnetisable screwdriver bit, the bit holder comprising: an electromagnet for magnetising the screwdriver bit.

2. The bit holder in accordance with claim 1, further comprising: a hollow shaft with a bit receptacle at and end of the hollow shaft for fastening the screwdriver bit, wherein the electromagnet is arranged inside the hollow shaft behind the bit receptacle.

3. The bit holder in accordance with claim 2, wherein the electromagnet includes an anchor, the anchor causing the bit receptacle and/or the screwdriver bit to vibrate.

4. The bit holder in accordance with claim 2, wherein the bit holder includes a vibration inducer causing the bit receptacle and/or the screwdriver bit to vibrate.

5. A device for the automated manufacture of screw connections, the device comprising: a jointed arm robot with an output element rotatable around an effector axis (wE), and a bit holder according to claim 1, wherein the bit holder is accommodated at least indirectly on the output element and is rotatable around the effector axis (wE) by the output element.

6. A procedure for operating the device for the automated manufacture of screw connections according to claim 5, at least comprising the following procedural steps: arranging a magnetisable screwdriver bit on the bit holder, magnetising the screwdriver bit via the electromagnet, accommodating a magnetisable screw on the screwdriver bit, and manufacturing a screw connection via the screw.

7. The procedure in accordance with claim 6, wherein the screwdriver bit is cleaned of adhering metal chips after the manufacture of a number of screw connections, wherein the screwdriver bit and/or the metal chips are demagnetised by the electromagnet.

8. The procedure in accordance with claim 7, wherein the screwdriver bit is vibrated by an anchor of the electromagnet or by a vibration inducer during demagnetisation and/or following demagnetisation.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Reference is now made more particularly to the drawings, which illustrate the best presently known mode of carrying out the invention and wherein similar reference characters indicate the same parts throughout the views.

[0017] FIG. 1a is a schematic cross-section view of a first sample embodiment of the inventive bit holder.

[0018] FIG. 1b is a schematic cross-section view of a second sample embodiment.

[0019] FIG. 1c is a schematic cross-section view of a third sample embodiment.

[0020] FIG. 2 is a part cross-section view of an inventive device.

DETAILED DESCRIPTION OF THE DRAWINGS

[0021] FIGS. 1a through 1c show schematic cross-section views of three sample embodiments of the inventive bit holder 1 for a magnetisable screwdriver bit 2, wherein the bit holder 1 features in each case the hollow shaft 12 with the bit receptacle at the end 13 for fastening the screwdriver bit 2 preferentially in a detachable manner, as well as the electromagnet 11, which is arranged inside the hollow shaft 12 behind the bit receptacle 13. The electromagnet 11 can be excited though the supply line 15. Excitation of the electromagnet 11 gives rise to a magnetic flow concentrated on the longitudinal axis of the hollow shaft 12, so that the screwdriver bit 2 is axially magnetisable.

[0022] In the second sample embodiment of FIG. 1b, the electromagnet 11 features the anchor 11a, wherein the screwdriver bit 2 can be made to vibrate by means of the anchor 11a. The maximum stroke of the anchor 11a is measured in such a way that when it is correspondingly excited by the electromagnet 11 it hits the back of the screwdriver bit 2. Excitation of the electromagnet 11 by means of an alternating voltage thus generates a periodic tapping of the anchor 11a against the back of the screwdriver bit 2.

[0023] In the third sample embodiment of FIG. 1c, the separate vibration inducer 14 is integrated in the bit holder 1 instead of an anchor of this kind, where the vibration inducer 14 is fashioned as a piezoelectric actor that likewise can be actuated electrically via the supply line 15 and is designed to induce vibration of the bit receptacle 13 and thus of the screwdriver bit 2.

[0024] FIG. 2 shows a part cross-section view of an inventive device 100 for the automated manufacture of screw connections, comprising the jointed arm robot 3 with the output element 31 rotatable around the effector axis wE against the end link 32. In the present case, the jointed arm robot 3 is designed as a six-axis robot, wherein the fifth rotary axis w5 is marked and the effector axis wE corresponds to the sixth rotary axis of the jointed arm robot 3. The device 100 furthermore comprises the inventive bit holder 1 that is accommodated on the output element 31 and is rotatable around the effector axis wE by means of the output element 31. The supply line 15 for exciting the electromagnet 11 is connected to the port 33, which is connected for example to the electric power supply of the jointed arm robot 3 via sliding contacts.

[0025] The invention is not limited in its embodiment to the preferred sample embodiment specified above. Rather, a number of variants are conceivable, which also make use of embodiments of a principally different nature from the solution shown. All features and/or advantages arising from the claims, the description or the drawings, including design details and spatial arrangements, can be material to the invention both in themselves and in the widest range possible of combinations.

LIST OF REFERENCE NUMBERS

[0026] 100 Device [0027] 1 Bit holder [0028] 11 Electromagnet [0029] 12 Hollow shaft [0030] 13 Bit receptacle [0031] 14 Vibration inducer [0032] 2 Screwdriver bit [0033] 3 Jointed arm robot [0034] 31 Drive element [0035] 32 End link [0036] 33 Port [0037] wE Effector axis [0038] w5 Fifth rotary axis