Method and apparatus for outlining the environment of a multiarticular duty machine by means of a laser pointer

• US 4,685,054 A
• Filed: 02/28/1985
• Issued: 08/04/1987
• Est. Priority Date: 06/30/1983
• Status: Expired due to Fees

• Current Assignee: Valtion Teknillinen Tutkimuskeskus
• Original Assignee: Valtion Teknillinen Tutkimuskeskus
• Inventors: Halme, Aarne, Manninen, Markku
• Primary Examiner(s): RUGGIERO, JOSEPH F
• Application Number:
  US06/711,501
• Time in Patent Office: 887 Days
• Field of Search: 364/513, 364/478, 364/479, 364/559, 364/191-193, 364/188, 364/189, 901/9, 901/46, 901/47, 250/203 R, 250/203 CT, 250/104, 358/105, 358/107, 358/125, 358/126, 358/903, 414/730
• US Class Current: 700/86
• CPC Class Codes: B25J 19/022 using lasers
• CPC Class Codes: B25J 9/1671 characterised by simulation, either to verify existing program or to create and verify new program, CAD/CAM oriented, graphic oriented programming systems
• CPC Class Codes: G01S 17/88 Lidar systems specially adapted for specific applications

Abstract

A method and apparatus for outlining the manipulation environment of a duty machine automatically determines its working cycles. The method includes a laser pointer (2) which measures the direction and distance of the laser beam with respect to an object. By means of the pointer there is registered a set of points (1), which can be formed of separate pointes or of continuous lines and which gives a rough illustration of the entire manipulation space, i.e. its free space and the objects located therein. The set of points is completed to form a model of the manipulation environment both by means of geometric plane figures (primitive volumes)(3) sent from the user'"'"'s keyboard, and by means of mathematical algorithms, in order to match the spatial planes and curves with the given set of points. The automatically determined trajectories are corrected during the working performance according to the feedback information received from the object under operation.

Claims

1. A method for outlining features in the manipulation environment of a duty machine comprising:

pointing the laser beam of a laser pointer in succession at a plurality of points on features of the environment, the laser pointer being movable to different positions for directing the laser beam at different directions to the plurality of points, the plurality of points being at different distances from the laser pointer;

measuring the direction of the laser beam for each point;

measuring the distance of the laser pointer to each point;

storing the measured directions and distances for each point in a memory, the stored directions and distances forming position information for each of the points;

selecting one of a plurality of geometric plane figures representing primitive volumes, using a keyboard;

providing a plurality of mathematical algorithms which are useful in producing model spatial planes and curves using some of the plurality of points; and

applying the geometric plane figures and the mathematical algorithms to the position information of the plurality of points to form a model of the manipulation environment including its features.

2. A method according to claim 1 wherein the features of the manipulation environment include at least one object to be moved, at least one obstacle to be avoided and at least one terminal location, said method including pointing the beam at at least one point on the object, at a plurality of points on the obstacle and at least one point at the terminal location, the duty machine having an articulation member movable to a plurality of trajectory points in the manipulation environment between the object and the terminal location, the object to be moved to each of the trajectory points to move the object to the terminal location, the method including pointing the laser beam at the object at each of the trajectory points, measuring the direction and distance for the beam at each of the trajectory points, and storing the measured direction and distance of the beam for the trajectory points in a memory to use for moving the articulation member to the trajectory points.

3. A method according to claim 1 including mounting the laser pointer to be pivotable about two mutually orthogonal axes for changing the direction of the beam, and measuring the angular position of the pointer about each of the axes for measuring the direction of the beam for each point.

4. A method according to claim 3 including using a viewfinder to focus the beam on the points and using the focus position of the viewfinder to measure the distance of each point to the laser pointer.

5. A method according to claim 3 including measuring the transit time of the laser beam from the pointer to each point and back to the pointer for measuring the distance of each point from the pointer.

6. A method according to claim 1 including manually moving the laser pointer for pointing the beam at each point and manually entering the measured direction and measured distance of the beam for each point using a switch.

7. An apparatus for outlining features in the manipulation environment of a duty machine by forming a point model of the features, comprising:

a laser pointer for pointing a laser beam at a succession of points on the features of the manipulation environment;

direction changing means carrying the laser pointer for moving the beam to a plurality of directions each for a separate point;

distance measuring means operatively connected to said laser pointer for measuring the distance between the laser pointer and each point in a direction along the beam;

memory means operatively connected to said direction changing means and said distance measuring means for storing direction and distance information for each of the points;

a menu-type keyboard for containing a plurality of geometric plane figures each of which are selectable by a user;

a calculation unit operatively connected to said keyboard and to said memory and containing mathematical algorithms, said calculator unit calculating the positions of the points and producing the point model using at least some of the geometric plane figures from the keyboard and the mathematical algorithms.

8. An apparatus according to claim 7 wherein said direction changing means includes a portion sensor for sensing the position of the laser pointer and for supplying signals to said memory.

9. An apparatus according to claim 7 wherein said distance measuring means comprises a range finder in said laser pointer which is settable to focus the beam on each point, the setting of said range finder for each point corresponding to the distance of the laser pointer to that point.

10. An apparatus according to claim 7 wherein said distance measuring means comprises means for measuring a transit time of the light beam from the pointer to each point and back to the pointer.

11. An apparatus according to claim 7 wherein the duty maching includes an articulating arm and an arm control unit for moving the articulating arm, said arm control unit being connected to said calculation unit for receiving signals for moving the arm.

12. An apparatus according to claim 11 including arm position means for generating signals corresponding to the position of the arm, connected to said arm control unit for use in conjunction with signals from said calculation unit to move said arm.