Paddle

About: Paddle is a research topic. Over the lifetime, 5649 publications have been published within this topic receiving 28389 citations.

Method of and apparatus for determining physical properties of materials

Abstract: 896,491. Automatic liquid level control systems. AUTOMATION PRODUCTS Inc. Dec. 23, 1958 [Dec. 26, 1957], No. 41569/58. Class 38 (4). [Also in Groups XVIII, XIX and XL(c)] A device for determining physical data, e.g. density, viscosity, and specific gravity comprises a tubular portion 14 with end screw-caps 16, 18 which, with retaining discs 24, 26, form compartments for electromagnetic vibrator and detector coils 36, 38, respectively. The coils 36, 38, having permanent magnet cores 40, 42 and mounted on non-magnetic sleeves 32, 34 carried by the discs 24, 26, receive respectively magnetic armatures 56, 58 which are connected to the corresponding ends of bent flexible vibrator rods 52, 54. The latter, extending through seal supports 60, 62, at node points, in an externally-threaded boss 20 on the portion 14, are attached to an external paddle 50. In operation the boss 20 is threaded into a liquid container at the desired position so that the paddle 50 is sealed within the container. A conduit, not shown, which is screwed into an internally-threaded boss 22 on the tubular portion 14, carries a pair of lines 43, 44 which supply alternating current to the vibrator coil 36 and a pair of lines 46, 48 which lead from the coil 38 to suitable detector device. When the coil 36 is energized, the mechanical vibrations, which are induced in the armature 56, are transmitted through the rod 52 to the paddle 50 from which they are reflected through the rod 54 to the armature 58. Changes in either the frequency or amplitude of the vibrations, or in both, corresponding to variations in the level of the liquid in the container and which are picked up by the coil 38, are passed as electric signals to a detector, not shown. The device is preferably operated at the resonant frequency of the rods 52, 54 to obtain sensitive measurements, it may, however, be selected to operate above, or below, the resonant frequency to obtain modified characteristics. In a modification, for measuring, e.g., the viscosity of a liquid, a separate paddle is attached to the end of each rod 52, 54.

Stimulation system with percutaneously deliverable paddle lead and methods of making and using

Abstract: An implantable lead includes an expandable paddle body and a plurality of electrodes disposed on the paddle body. The electrodes are configured and arranged to provide electrical stimulation to adjacent tissue when implanted and the lead is coupled to a control module. The paddle body is configured for percutaneous implantation through an introducer followed by expansion of a volume of the paddle body by at least 10%. Alternatively, the paddle body is configured for percutaneous implantation and when implanted the lead is configured and arranged so that a position or orientation of the plurality of electrodes relative to the paddle body can be altered.

High speed labeler

Abstract: A labeling assembly for applying labels carried on a substrate to a sequential series of moving documents is provided. The assembly transports the document in a generally vertical end on end orientation down a conveying path and peels the label from the substrate to position the peeled label in a generally vertical orientation. The labeling assembly also includes a paddle having a front surface with vacuum ports for attaching and releasably retaining the peeled label on the front surface. An actuating mechanism pivots the paddle to force an end of the retained label into contact with the document. Upon contact, the downstream end of the retained label adheres to the document and the label is pulled off the paddle. As the label is pulled off the paddle the contact between the end of the paddle presses the label against the document.

Bouncing an Unconstrained Ball in Three Dimensions with a Blind Juggling Robot

Abstract: We describe the design of a juggling robot that is able to vertically bounce a completely unconstrained ball without any sensing. The robot consists of a linear motor actuating a machined aluminum paddle. The curvature of this paddle keeps the ball from falling off while the apex height of the ball is stabilized by decelerating the paddle at impact. We analyze the mapping of perturbations of the nominal trajectory over a single bounce to determine the design parameters that stabilize the system. The first robot prototype confirms the results from the stability analysis and exhibits substantial robustness to perturbations in the horizontal degree of freedoms. We then measure the performance of the robot and characterize the noise introduced into the system as white noise. This allows us to refine the design parameters by minimizing the H 2 norm of an input-output representation of the system. Finally, we design an H 2 optimal controller for the apex height using impact time measurements as feedback and show that the closed-loop performance is only marginally better than what is achieved with open-loop control.

Multi-screw, continuous, material processing systems

Abstract: An improved system for treating material proceeding continuously through a processing barrel having at least twin interconnected cylinders with saddle portions of generally V cross section at the points of interconnection of the cylinders. Twin rotating parallel mixer shafts, co-axially mounted in the cylinders, have radially interwiping screw or paddle elements between a material charging inlet and a material discharging outlet which are configured to wipe the cylinders including the saddle portions. Sets of paddle elements, each of which includes a cylinder closing paddle, are provided on the shafts at a flow control station between the inlet and outlet, and a movable flow-controlling saddle or valve element is mounted with relation to the cylinder closing paddle sets in a position such that it can be moved from an opened position to a position to restrict or block flow past the sets of paddle elements. A vacuum vent port can be provided for degassing or like purposes in the barrel casing at the flow control station in a position in which its relationship with the elements is such as to avoid the flow of product out the port.