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Ngày tải lên: 26/07/2014, 17:20
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... electric machinery and protect it and its operator. Actuators Linear mechanical switches Sclater Chapter 10 5/3/01 1:08 PM Page 356 CHAPTER 10 TORQUE-LIMITING, TENSIONING, AND GOVERNING DEVICES Sclater ... radially, the input- output ration changes. By properly arrang- ing the rings and springs, the gear ration can be controlled by the movement of the balls to maintain a constant value of output speed. Sclater ... between the two units, at all speeds and loads. The variations caused by oil leakage and sim- ilar factors are compensated automati- cally by the idler roll and linkage. They adjust the pilot valve...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... photoemitter and photoreceiver. Sclater Chapter 3 5/3/01 10: 23 AM Page 90 64 Sclater Chapter 3 5/3/01 10: 20 AM Page 64 81 Fig. 19 A paste belt applicator passes around the pulley in a pastepot and slides ... the raising and lowering of the transport is accomplished by a cam. The shafts, F, E, and D are positioned by the frame of the machine. Special bell cranks support the transport and are interconnected ... shaft. Sclater Chapter 3 5/3/01 10: 22 AM Page 87 66 Fig. 3 In another type of action, the forward and return strokes are accomplished by a suitable mechanism, while the raising and lowering is imparted...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... near standstill. In the disengaged position, the angu- lar velocity ratio between the output and input shafts (the “gear” ratio) is entirely dependent upon the design angles α and β and independent ... irregular geneva drive. 107 Fig. 5 In this intermittent drive, the two rollers drive the output shaft and lock it during dwell periods. For each revolution of the input shaft, the output shaft has two ... cam, the input shaft would drive the output gear by the worm gear at constant speed. The worm and the bar- rel cam, however, can slide linearly on the input shaft. The rota- tion of the input shaft...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... The input then drives the output with the bevel gears. Rotating the adjusting shaft in a plane at right angles to the input- output line changes the relative radial position of the input and output ... 138 134 TWELVE EXPANDING AND CONTRACTING DEVICES Parallel bars, telescoping slides, and other devices that can spark answers to many design problems. Fig. 1 Figs. 1 and 2 Expanding grilles are ... continuous rotary input motion into an output that oscillates the shaft back and forth. Sclater Chapter 5 5/3/01 11:47 AM Page 170 inputs, and z is the output. The motion of x and y in the same...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... ARRANGEMENTS Differential, duplex, and other types of screws can provide slow and fast feeds, minute adjustments, and strong clamping action. Rapid and slow feed. With left- and right-hand threads, slide motion ... are left and right hand. L A = L B plus or minus a small increment. When L B = 1 /10 and L A = 1 /10. 5, the linear motion f screw A will be 0.05 in. per turn. When screws are the same hand, linear ... and drives a dowel pin for locking purposes. A right- and left-handed shaft (C) actuates a press. Sclater Chapter 6 5/3/01 12:25 PM Page 192 Do you need a buffer between vibrating machinery and...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... magnetic signal amplification. A rotating input avoids a lin- ear input and output of the simple windlass. Control and output ends of the mul- titurn bands are both connected to gears mounted ... motor, the maximum output speed will be 1200 = 3984 rpm, and the minimum output speed = 3984/11 = 362 rpm. Double-reduction system (Fig. 3). Solid sheaves are on both the input and output shafts, ... conveying, and elevating. STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AND CONVEYING SINGLE WIDTH—Sizes 5 ⁄ 8 in and smaller have a spring-clip connect- ing link; those 3 ⁄ 4 in and larger...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... motor com- parable in size and power to those used in standard reel-to-reel recorders, and a large bi-peripheral flywheel and sturdy capstan that reduces wow and flutter and drives the tape. A patent ... balance between transmitted torque and operating life. Input and output functions always rotate in the same direction, irrespective of the number of bearings, and different results can be achieved ... of the input shaft. Input shaft a carries spur gear c, which has approximately twice the face width of spur gears f and d mounted on output shaft b. Spur gear c meshes with idler e and with...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... clutch, on the other hand, is a three-member unit with rotating input and output members and a stationary coil housing. It eliminates the need for brushes and slip rings, but it demands additional ... Page 317 336 LINKAGES FOR BAND CLUTCHES AND BRAKES Fig. 1 An outside band clutch operated by a roller and cone. Fig. 2 An outside band clutch made as two half wrap bands with an interme- diate ... faster. Edges of the clutch bands carry the entire load, and there is also a compound action of one band upon another. As the torque builds up, each band pushes down on the band beneath it, so each...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... POWER Cartridge-actuated devices generate a punch that cuts cable and pipe, shears bolts for fast release, and provides emergency thrust. Sclater Chapter 11 5/3/01 1:17 PM Page 402 Fig. 1 Automatic weighing and ... simplicity, and cost. Fig. 1 A bimetallic sensor is simple, compact, and precise. Contacts mounted on low-expansion struts determine slow make- and- break action. A shell contracts or expands with ... circuit that controls a heat- ing or cooling unit. It is adjustable and resistant to shock and vibra- tion. Its range is 100 to 1500°F, and it responds to a temperature changes of less than 0.5°F. Fig....
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 13
... ψ 13 and ψ 12 . This establishes points A′ 2 , A′ 3 and A′ 4 , but here A′ 3 and A′ 4 coincide because of symmetry of A 3 and A 4 about A 0 B 0 . 4. Draw lines A 1 A′ 2 and A 1 A′ 4 , and the ... λ opt = 2. 6100 . This gives a ′ = 1.5382, b ′ = 0.40674, c ′ = 1.0616, and d ′ = 1.0218. For a 4 in. crank, k = 4/0.40674 = 9.8343 and a = 15.127 in., b = 4 in., c = 10. 440 in., and d = 10. 049 ... on a conveyor is tilted 90º by an output crank, which is actuated by an input crank through a coupler. Other mechanisms shown can also coordinate the input and output angles; some have dwell periods...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 14
... permit lettering, callouts, and the entry of notes and parts lists, and some even offer the capability for calculating such physical properties as volume, weight, and center of gravity if the drawing ... system, builds parts up to 10 in 3 (164 cm 3 ) while the FDM3000, a floor- standing system, builds parts up to 10 × 10 × 16 in. (26 × 26 × 41 cm). Two other floor-standing systems are the FDM ... than 5 ms/step. An input of two simple input pulse signals will operate it. This motor can index gears in MEMS such as locking devices, counters, and odometers. It was built with Sandia’s four-layer...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 15
... Technologies Group, Radford, VA • Ledex Actuation Products, TRW Control Systems, Vandalia OH • Sandia National Laboratories, Sandia Corporation, Albuquerque, NM • SolidWorks Corporation, Concord, MA • ... Data Sclater, Neil. Mechanisms and mechanical devices sourcebook / Neil Sclater, Nicholas P. Chironis.— 3rd ed. p. cm. Rev. ed of: Mechanisms & mechanical devices sourcebook / [edited by] ... applications beyond NASA’s immediate objectives in space science and requirements for specialized equip- ment. The names of the scientist/inventors and the NASA facilities where the work was performed have...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 12
... left-handed threads, • An eye on a shank with external right- handed threads, and • A flanged collar with left-handed external threads to mate with the shank of the first- mentioned eye, and right-handed ... is bulky and diffi- cult to use, requires periodic mainte- nance, and poses the threat of leakage of hydraulic fluid, which can contaminate the clean room. The actuator rests on a stand and imparts ... slot in the rail and engages the rail roller. In step 4, the handle is rotated upward 75º, forcing the box 410 rearward to mate with the electrical connectors. In step 5, the handle is pushed...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 16
... 437 formulas for 436 five-slot 103 four-slot 103 104 106 437 kinematics data for 436 six-slot 103 436 four-bar 103 four-station 205 groove cam 103 internal wheel charts for angular ... robot 48 ball -and- cone 250 ball -and- disk, and 251 ball -and- screw 5 12 bearings and roller 117 belt 12 224 257 belt -and- chain, variable speed 224 cam for machine tools 210 for tool-slide ... four-slot 104 409 439 kinematics data for 439 six-slot 440 slot-crank motion 439 locking-arm 103 locking-slide 103 long-dwell 104 modified drives 106 modified-motion 104 noncircular...
Ngày tải lên: 22/10/2012, 14:27