Paddle

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

Analysis of motion during the breast clamping phase of mammography

Abstract: Objective:To measure paddle motion during the clamping phase of a breast phantom for a range of machine/paddle combinations.Methods:A deformable breast phantom was used to simulate a female breast. 12 mammography machines from three manufacturers with 22 flexible and 20 fixed paddles were evaluated. Vertical motion at the paddle was measured using two calibrated linear potentiometers. For each paddle, the motion in millimetres was recorded every 0.5 s for 40 s, while the phantom was compressed with 80 N. Independent t-tests were used to determine differences in paddle motion between flexible and fixed, small and large, GE Senographe Essential (General Electric Medical Systems, Milwaukee, WI) and Hologic Selenia Dimensions paddles (Hologic, Bedford, MA). Paddle tilt in the medial–lateral plane for each machine/paddle combination was calculated.Results:All machine/paddle combinations demonstrate highest levels of motion during the first 10 s of the clamping phase. The least motion is 0.17 ± 0.05 mm/10 s (n ...

Wafer transfer arm mechanism

Abstract: A transfer arm mechanism including a base assembly, a pivoting arm extending generally upwardly from the base assembly, a wafer support paddle, and mechanisms for pivoting the arm back and forth while maintaining the wafer support paddle in a horizontal plane. A base assembly includes a rotatable plate which can rotate the mechanism through 360°, and a support plate which can be moved up and down along guide posts attached to the rotatable plate. The mechanism for moving the wafer paddle along a horizontal plane includes a cam member attached to the support plate, and a cam follower which rolls along an upper surface of the cam member to compensate for the pivoting action of the arm assembly. A mechanism is also provided to prevent the wafer paddle from tipping which includes a drive chain extending between a gear which is rotationally fixed with respect to the support plate and a gear which is attached to a pivot pin supporting the wafer paddle.

Magnetic stirrer for sponge raw materials

Abstract: The utility model provides a magnetic stirrer for sponge raw materials, belonging to the technical field of sponge processing. The magnetic stirrer solves the problem that transmission power of an existing stirrer is decreased because raw materials enter into an isolation hood of the existing stirrer to hinder rotation of a permanent magnetic rotor. The magnetic stirrer for the sponge raw materials comprises an outer magnetic body, a permanent magnetic rotor, a motor, a stirring paddle, a barrel-shaped TDI storage tank and a connecting cover which is hermetically fixed at the opening of the TDI storage tank, wherein the stirring paddle is provided with stirring blades, an output main shaft of the motor is fixed with the outer magnetic body and synchronously moves with the outer magnetic body, the stirring paddle is fixed with the connecting cover by virtue of a bearing and can rotate relative to the TDI storage tank, a circular groove is formed in the inner side of the connecting cover, and a concave hood is fixedly connected to the upper end of the stirring paddle and is embedded into the circular groove to form seal. The stirrer is driven by a magnetic coupling effect, and dynamic seal is converted into stationary seal to guarantee zero leakage.

Method of manufacture of an image creation apparatus

Abstract: An ink jet printer includes a trough having side walls and an exposed roof, the trough being substantially filled with fluid during operation. A paddle vane is located within the trough and offset from one wall when the paddle vane is in a quiescent position. An actuation mechanism is attached to the paddle vane such that, upon activation of the actuation mechanism, the paddle vane is caused to move towards the wall, resulting in an increase in pressure in the fluid between the wall and the paddle vane. This results in a consequential ejection of fluid via the exposed roof. A method of manufacture of the ink jet printer comprises the steps of initially providing a silicon wafer having a circuitry wafer layer including electrical circuitry necessary for the operation of the thermal actuation mechanisms on demand. The trough is etched in the surface of the wafer. The actuation mechanism and the paddle vane are created on the silicon wafer by means of depositing and etching a series of sacrificial layers to form a supporting structure for the actuation mechanism and the paddle vane, in addition to depositing and suitably etching a series of materials for forming the actuation mechanism and the paddle vane. An ink supply channel interconnecting the trough with an ink supply is etched through the wafer. Any remaining sacrificial layers are etched away so as to release the actuation mechanism and the paddle vane for operation.