Machine tool device having a computing unit adapted to distinguish at least two motions

• US 8,948,903 B2
• Filed: 10/30/2008
• Issued: 02/03/2015
• Est. Priority Date: 12/21/2007
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Niehsen, Wolfgang, Wingbermuehle, Jochen, Heiler, Matthias
• Primary Examiner(s): JARRETT, RYAN A
• Application Number:
  US12/747,862
• Publication Number:
  US 20110167970A1
• Time in Patent Office: 2,287 Days
• Field of Search: None
• US Class Current: 700/177
• CPC Class Codes: F16P 3/14 the means being photocells or other devices sensitive without mechanical contact
• CPC Class Codes: F16P 3/142 using image capturing devices
• CPC Class Codes: F16P 3/147 using electro-magnetic technology, e.g. tags or radar
• CPC Class Codes: G01P 3/36 Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light G01P3/68 takes precedence; gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams G01C19/64
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 7/20 Analysis of motion motion estimation for coding, decoding, compressing or decompressing digital video signals H04N19/43, H04N19/51
• CPC Class Codes: Y10T 83/04 Processes
• CPC Class Codes: Y10T 83/081 With randomly actuated stopping means
• CPC Class Codes: Y10T 83/086 With sensing of product or product handling means

Abstract

A machine tool device having a monitoring unit for monitoring at least one machine tool monitoring range, the monitoring unit having an evaluation unit. The evaluation unit has a computing unit which is provided to distinguish at least two motions in the machine tool monitoring range.

Claims

1. A machine tool device, comprising:

a monitoring unit for monitoring at least one machine tool monitoring range, the monitoring unit having an evaluation unit, the evaluation unit having a computing unit adapted to determine a motion vector field and to distinguish at least two motions in the machine tool monitoring range;

wherein the computing unit is adapted to;

determine a comparison variable between motion parameters of the at least two motions, each of which characterizes a different motion; and

detect the presence of a human body part in the machine tool monitoring range based on the motion vector field by ascertaining an extension of a region of uniform velocity and comparing the extension to prestored data corresponding to an extension of the human body part.

2. The machine tool device as recited in claim 1, wherein the motion parameters in each case characterize a velocity value.

3. The machine tool device as recited in claim 1, wherein the motion parameters in each case characterize a direction of motion.

4. The machine tool device as recited in claim 1, wherein the computing unit is adapted to distinguish at least two regions of uniform velocity in at least one operating mode in the motion vector field.

5. The machine tool device as recited in claim 1, wherein the computing unit is adapted to distinguish the motions from one another by evaluating optical data.

6. The machine tool device as recited in claim 5, wherein the computing unit is adapted to distinguish the motions with the aid of an optical flow method.

7. The machine tool device as recited in claim 1, further comprising:

a safety device to carry out a safety measure as a function of a signal of the evaluation unit.

8. The machine tool device as recited in claim 7, wherein the computing unit is adapted to associate a security level of the safety device with the comparison variable.

9. A machine tool, comprising:

a tool; and

a machine tool device, including a monitoring unit for monitoring at least one machine tool monitoring range associated with the tool, the monitoring unit having an evaluation unit, the evaluation unit having a computing unit adapted to determine a motion vector field and to distinguish at least two motions in the machine tool monitoring range;

wherein the computing unit is adapted to;

determine a comparison variable between motion parameters of the at least two motions, each of which characterizes a different motion; and

detect the presence of a human body part in the machine tool monitoring range based on the motion vector field by ascertaining an extension of a region of uniform velocity and comparing the extension to prestored data corresponding to an extension of the human body part.

10. A method for monitoring a machine tool device, comprising:

monitoring a machine tool monitoring range of a machine tool;

detecting data in the machine tool monitoring range;

determining a motion vector field;

distinguishing at least two motions in the machine tool monitoring range from one another based on the data; and

determining a comparison variable between motion parameters of the at least two motions, each of which characterizes a different motion

detecting the presence of a human body part in the machine tool monitoring range based on the motion vector field by ascertaining an extension of a region of uniform velocity and comparing the extension to prestored data corresponding to an extension of the human body part.

11. The method as recited claim 10, further comprising:

associating a security level of a safety device via which a safety measure is carried out with the comparison variable.