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This paper presents the design, fabrication and testing of a micro-injector for precision injection of biological cells. Based on the specifications on travel range and injection speed, a single-axis translational motion mechanism is designed by using flexure mechanisms for precision motion guiding of the micro-injector. The mechanism parameters are designed and optimized to cater for the requirements...
This paper reports on a novel 3D-printed polymeric compliant constant-force buffering gripping mechanism. The motivation of this work is to develop a buffering gripping mechanism to avoid the damage of manipulated biological object induced by excessive displacement output. The presented zero-stiffness mechanism is realized by connecting the negative-stiffness part and positive-stiffness part in parallel...
This paper presents the design of a flexure-based precision positioning micro-motion stage system with constant output force. The stage mechanism is devised using folded leaf flexure (FLF) to achieve positive-stiffness structure. Bistable beams are employed to design negative-stiffness structure by using their buckling characteristics. Two bistable beams and two FLFs are combined together as a zero-stiffness...
This paper proposes the design of a compliant constant-force gripper mechanism for manipulating biological objects. It can avoid the damage induced by excessive drive displacement during the manipulation. A zero-stiffness mechanism is realized by connecting the negative-stiffness mechanism and positive-stiffness mechanism in parallel. The negative stiffness is obtained by a bistable beam mechanism...
In this paper, the design and testing of a micro-syringe pump is carried out for precision delivery of liquid inside a tiny tube. A single-axis micro-motion pump is designed by using flexure mechanisms for precision drive of the micro-syringe. Based on the required specifications of travel range and load capability, a compliant translational motion mechanism is developed. The machine parameters are...
This paper presents the design and analysis of a new large-range micro-gripper which is constructed using flexure hinges. The gripper is actuated by only one piezoelectric stack actuator (PSA) and the output of the grip arm is approximately rectilinear movement, because the displacement of nonworking direction is extremely small. In order to achieve a large gripping range, a dual-stage amplifier is...
This paper presents the design, analysis, fabrication, and experimental testing of a two-axis micro-motion machine dedicated to precision alignment applications. The designed machine features a long alignment distance over ±5 mm in each axis and a well decoupling motion in the two axes. The design is devised using metal flexure mechanisms based on multistage leaf spring, which allows a precise movement...
Limited-angle rotational compliant mechanism is required in micropositioning applications where a high-resolution rotational motion with a large range and compact size is needed. This paper presents the conceptual design, analytical modeling, and FEA performance evaluation of a novel compliant rotational micropositioning mechanism, which is designed based on a rotary flexure bearing. To enlarge the...
In this paper, the design of a new compliant two-axis PZT actuated gripper is proposed based on flexure mechanisms. Its uniqueness is that both of the two gripper jaws can achieve two degree-of-freedom (DOF) movement. A lever structure is designed to meet the requirement of larger displacement due to the stroke limitation of the actuator. The gripper parameters are optimized by using genetic algorithm...
This paper presents the design, analysis, and testing of a novel dual-range, dual-resolution XY micropositioning stage driven by a single actuator in each axis. As compared with dual-servo stages, it allows the reduction on the cost of both hardware and control design workload. The compliant stage is devised using leaf springs to achieve a large stroke. Strain sensors are employed to provide coarse...
Micropositioning systems with the properties of long travel range, compact physical size and high accuracy are required in many precision engineering applications. This paper presents the design, fabrication and testing of a novel two-axis compliant parallel-kinematics precision positioning stage with a centimeter stroke and compact size. Different from existing work, the presented stage owns a much...
This paper presents the design, fabrication, and testing of a compliant rotary nanopositioning stage for precision engineering applications. The major advantage of the rotary stage lies in that it possesses a large rotational range and a compact size simultaneously. A new idea of compound radial flexure is proposed to enable this merit. A novel rotary stage is designed to provide a rotary angle over...
In this paper, a concept of totally decoupling is proposed for the design of a flexure parallel micromanipulator with both input and output decoupling. Based on flexure hinges, the design procedure for an XY totally decoupled parallel stage (TDPS) is presented, which is featured with decoupled actuation and decoupled output motion as well. By employing (double) compound parallelogram flexures and...
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