Pick and place machine with workpiece motion inspection
First Claim
1. A pick and place machine for placing a component upon a workpiece, the machine comprising:
- a placement head having at least one nozzle for releasably holding the component, the placement head being configured to deliver the component to a placement location on the workpiece during a placement cycle;
a robotic system for generating relative movement between the placement head and the workpiece;
an image acquisition device disposed to obtain a plurality of images including the placement location of the component;
an image processing device for analyzing the images generated by the image acquisition device, the image processing device being configured to segment each image to have an image portion that contains neither the placement location nor the component; and
wherein the image processing device is configured to compare the segmented image portion in each of the plurality of images to measure vertical oscillation of the workpiece during the placement cycle.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments include measuring motion characteristics of the workpiece through the placement process. Since the component is placed on the workpiece with some force to ensure proper adhesion to the workpiece, some deflection of the workpiece is expected during the placement cycle. The placement force is adjusted to ensure that the component is safely placed into the solder paste or adhesive. Placement force is adjusted through a number of characteristics including: choice of spring tension in the nozzle; the length of the nozzle and the amount of over-travel into the board; the rigidity of the board and design; and the placement of the board support mechanisms. With proper adjustment of these characteristics and parameters, high quality placements onto the workpiece can be ensured.
-
Citations
7 Claims
-
1. A pick and place machine for placing a component upon a workpiece, the machine comprising:
-
a placement head having at least one nozzle for releasably holding the component, the placement head being configured to deliver the component to a placement location on the workpiece during a placement cycle; a robotic system for generating relative movement between the placement head and the workpiece; an image acquisition device disposed to obtain a plurality of images including the placement location of the component; an image processing device for analyzing the images generated by the image acquisition device, the image processing device being configured to segment each image to have an image portion that contains neither the placement location nor the component; and wherein the image processing device is configured to compare the segmented image portion in each of the plurality of images to measure vertical oscillation of the workpiece during the placement cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification