... 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...
... 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...
... 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 Expanding grilles are ... links.
Fig. 7 Telescoping cylinders are the
basis for many expanding and contracting
mechanisms. In the arrangement shown,
nested tubes can be sealed and filled with a
highly temperature-responsive medium
such...
... 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...
... 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 ... made in
widths up to 12 strands.
STANDARD ROLLER DIAMETER—made with 1 to 4 in pitch and
cotter-pin-type connecting links.
OVERSIZED ROLLER DIAMETER—Same base chain as standard
roller type but not ... 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...
... 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-tooth-
contact noise and vibration. ... the
inertia of the flywheel and the accuracy
of the flywheel and capstan. The greater
the inertia the more uniform is the tape
drive, and the less pronounced is the
wow and flutter.
The flywheel...
... 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
precision potentiometers.
Eight-Joint ... 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...
... 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 ... 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 ... floating rolls
are combined with two separate con-
trollers and actuators. The first controls
the in-feed speed and tension of the
paper stock, and the second controls the
wind-up.
The in-feed is controlled...
... 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 lubrication
and ... required. The striker mechanisms illustrated are
operated by springs, cams, magnetic force, air and vacuum
chambers, and centrifugal force. The drawings show only the
striking mechanisms.
Fig. 5...
...
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 ... example, in Fig. 1 two angular motions,
φ
12
and
φ
13
, must be synchronized with two others,
ψ
12
and
ψ
13
,
about the given pivot points
A
0
and B
0
and the given crank length
A
0
A. This means ...
ψ
13
, and
ψ
14
, using
freely chosen pivot points
A
0
and B
0
. In this case, crank length
A
0
A as well as B
0
B is to be determined, and the procedure is:
1. Locate pivot points
A
0
and B
0
on...
... 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 ... lowered and the next layer is applied. This procedure is repeated until the 3D
model is completed. A fault detection system determines the quality and thickness of
the wax and plastic layers and ... organic and freeform shapes. Consequently, commercial
software producers offer 3D hybrid surface and solid-modeling
suites that integrate 2D drafting and 3D wireframe with 3D surface
and 3D solid...
... Technologies Group, Radford, VA
• Ledex Actuation Products, TRW Control Systems, Vandalia OH
• Sandia National Laboratories, Sandia Corporation, Albuquerque, NM
• SolidWorks Corporation, Concord, MA
• ... Cataloging-in-Publication Data
Sclater, Neil.
Mechanisms and mechanical devices sourcebook / Neil Sclater, Nicholas P. Chironis.—
3rd ed.
p. cm.
Rev. ed of: Mechanisms & mechanical devices sourcebook ... 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...
... 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 ... is pushed upward an additional 15º, locking the handle
cam and the slide. In step 6, the handle is rotated an additional
30º, forcing the box and the mating spring-loaded electrical con-
nectors...
... first and second editions, (published in 1991 and 1996,
respectively), that has been supplemented by new and revised articles reflecting present
and future trends in mechanical engineering and ... third edition of Mechanisms & Mechanical Devices Sourcebook, a well illus-
trated reference book containing a wide range of information on both classical and mod-
ern mechanismsand mechanical ... illustra-
tions and descriptions of basic mechanismsand mechanical devices, accompanied by
useful applications information. This material has been culled from a wide range of
books and magazines...