Safety device for a machine and operating method
AssigneeQ-tec Pruefgeraete GmbH
InventorOtto Rothenaicher
Life of this patent
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Abstract
Production and work machines are to be able to be more safely operated. Thereto, they can be equipped with a safety device, which comprises a light curtain, a first and a second reflection device, which are each formed for reflecting light of the light curtain, and a first identification element integrated in the first reflection device as well as a second identification element integrated in the second reflection device. Moreover, the safety device comprises a first sensor device and a second sensor device for reading out the identification elements. A control device provides a start signal for the machine only if the first sensor device reads out the first identification information and the second sensor device reads out the second identification information at the same time.
Claims16
A safety device for a machine, the safety device comprising:
- a light curtain,
- a first and a second reflection device, which are each formed for reflecting light of the light curtain,
- a first identification element integrated in the first reflection device and a second identification element integrated in the second reflection device,
- a first sensor device for reading first identification information of the first identification element out of the first reflection device,
- a second sensor device for reading second identification information of the second identification element out of the second reflection device, and
- a control device for providing a start signal for the machine only if the first sensor device reads out the first identification information and the second sensor device reads out the second identification information at the same time and for providing a stop signal for the machine as soon as the light curtain detects its light reflected by one of the reflection devices.
A machine with a safety device,
- the safety device comprising:
- a light curtain,
- a first and a second reflection device, which are each formed for reflecting light of the light curtain,
- a first identification element integrated in the first reflection device and a second identification element integrated in the second reflection device,
- a first sensor device for reading first identification information of the first identification element out of the first reflection device,
- a second sensor device for reading second identification information of the second identification element out of the second reflection device, and
- a control device for providing a start signal for the machine only if the first sensor device reads out the first identification information and the second sensor device reads out the second identification information at the same time and for providing a stop signal for the machine as soon as the light curtain detects its light reflected by one of the reflection devices;
- wherein a protection area of the machine is monitored by the light curtain.
A method for operating a machine comprising:
- illuminating a border of a protection area of the machine with a light curtain,
- providing a first reflection device and a second reflection device, wherein a first identification element is integrated in the first reflection device and a second identification element is integrated in the second reflection device,
- reading first identification information of the first identification element out of the first reflection device by a first sensor device,
- reading second identification information of the second identification element out of the second reflection device by a second sensor device different from the first sensor device,
- detecting light of the light curtain after reflection on one of the reflection devices, and
- providing at least one of:
- a start signal for the machine only if reading out the first identification information and reading out the second identification information are effected at the same time, and
- a stop signal for the machine as soon as the detection of the light is effected.
Dependencies are inferred from the claim text.