MECHANISMS AND MECHANICAL ppsx

... 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 ... hand out of the way), (4) are fail-safe, (5) are sen- sitive enough to operate instantly, and (6) render the machine inoperative if anyone attempts to tamper with them or remove the...

Ngày tải lên: 22/10/2012, 14:26

... every lobe on gear 4, and T 3 /T 4 = L 3 /L 4 = 2/3, where T 3 and T 4 are the numbers of teeth on gears 3 and 4. T 1 and T 2 will denote the numbers of teeth on gears 1 and 2. Next, select the ... number of lobes L 3 and L 4 on the gears 3 and 4. In the drawings, L 3 = 2 and L 4 = 3. Any two lobes on the two gears (i.e., any two lobes of which one is on one gear and the...

Ngày tải lên: 22/10/2012, 14:26

... turns. Dynamic and static balancing is simplified when an expanding wheel is attached to a nonexpanding main wheel. As a pulley, an expanding wheel can have a steel band fastened to only one section and ... 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 Expand...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... and neg- ligible hysteresis characteristics. The bearing is radiation-resistant and can be used in high vacuum conditions or in environments where there is dirt an...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... rotating handwheel with a differential screw moves nuts A and B together, and links I and II are brought into toggle. Fig. 13 A riveting machine with a reciprocating piston produces a h...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... manufac- turing and alignment and (2) thermal and vibrational changes in the sizes and posi- tions of the meshing components. One of the benefits is a reduction of gear-toot...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... requirements of MIL-E-5400, class 3 and MILK-3926 specifications. Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and p...

Ngày tải lên: 22/10/2012, 14:26

... clutch plates, gear fingers, and pinned members form the basis of these ingenious mechanisms. Mechanical stops are often required in automatic machinery and servomechanisms to limit shaft rotation ... 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 GO...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... single-gland type. Automatic wear control compensates for normal wear and maintains volumetric efficiency. This pump will handle 5 to 300 gph without churning or foaming. It needs no lubr...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... switches, latch mechanisms and mechanical overload controls. These toggles also serve as: (1) detents (for holding other parts in selected position); (2) overload devices in mec...

Ngày tải lên: 22/10/2012, 14:26