mechanisms and mechanical devices sourcebook

Ngày tải lên: 22/10/2012, 14:27

Ngày tải lên: 22/10/2012, 14:27

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Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 27/01/2014, 14:20

Ngày tải lên: 17/10/2013, 10:15

... 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 them. Safety mechanisms ... breaks while the machine is running, the unsupported idler carrier falls to the base of the standard, and when the standard arrives at the sta- tion in the raceway adjacent to the cam C, the lug L on 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 other on the ... 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...

Ngày tải lên: 22/10/2012, 14:26

... 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 ... 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 ... 72º. 154 STROKE-AMPLIFYING MECHANISMS When the pressure angles of stroke- amplifying mechanisms are too high to satisfy the design requirements, and it is undesirable to enlarge the cam size, cer- tain devices...

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 and contamination. 185 TAUT BANDS ... 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

... 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 high mechanical ... cycloidal is considered to be the best standard cam contour because of its low dynamic loads and low shock and vibration characteristics. One reason for these outstanding attributes is that sud- den...

Ngày tải lên: 22/10/2012, 14:26