Compliant Suction Gripper with Seamless Deployment and Retraction for Robust Picking against Depth and Tilt Errors

TL;DR

This paper introduces a compact, compliant suction gripper capable of robustly picking objects over a wide range of distances and tilt angles without complex sensing, by seamlessly deploying and retracting using a shared vacuum source.

Contribution

The paper presents a novel suction gripper design with seamless deployment and retraction, enabling robust object picking in unstructured environments without elaborate sensing or control.

Findings

Can pick objects within 79 mm, 1.4 times the initial length.

Handles tilt angles up to 60 degrees.

Successfully demonstrated in various object picking tasks.

Abstract

Applying suction grippers in unstructured environments is a challenging task because of depth and tilt errors in vision systems, requiring additional costs in elaborate sensing and control. To reduce additional costs, suction grippers with compliant bodies or mechanisms have been proposed; however, their bulkiness and limited allowable error hinder their use in complex environments with large errors. Here, we propose a compact suction gripper that can pick objects over a wide range of distances and tilt angles without elaborate sensing and control. The spring-inserted gripper body deploys and conforms to distant and tilted objects until the suction cup completely seals with the object and retracts immediately after, while holding the object. This seamless deployment and retraction is enabled by connecting the gripper body and suction cup to the same vacuum source, which couples the vacuum picking and retraction of the gripper body. Experimental results validated that the proposed gripper can pick objects within 79 mm, which is 1.4 times the initial length, and can pick objects with tilt angles up to 60{\deg}. The feasibility of the gripper was verified by demonstrations, including picking objects of different heights from the same picking height and the bin picking of transparent objects.