Hello Florian,
I think the problem is "[ERROR] [1294763621.637601782]: Exception thrown
while connecting to the camera: [SR::open]: Failed to open device!"
because I am already a user on USB. Here's what I tried as you said,
cvarri@9W4DYH1:~$ sudo adduser cvarri usb
[sudo] password for cvarri: 
The user `cvarri' is already a member of `usb'.
cvarri@9W4DYH1:~$ roslaunch cob_camera_sensors tof_ros.launch 
Then I get the same problem.
Thanks,
CV
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