... place and remove parts from annealing furnaces
and punch presses, and they assemble and test electrical and
mechanical products. Benchtop robots pick and place electronic
components on circuit boards ... William J. Anderson and William
Shipitalo of Nastec, Inc., and Wyatt Newman of Case Western
Reserve University for
Lewis Research Center.
48
IMPROVED ROLLER AND GEAR
DRIV...
... positioning
antenna reflectors, opening and closing security gates, handling
materials, and raising and lowering scissors-type lift tables,
machine hoods, and light-duty jib crane arms.
Other linear ... input command for the desired output and the
measured actual output.
• In
integral control the signal driving the motor equals the
time integral of the difference between the input...
... drawings
of feed mechanisms.
Sclater Chapter 3 5/3/01 10:20 AM Page 62
73
TRAVERSING MECHANISMS FOR
WINDING MACHINES
The seven mechanisms shown are parts of different yarn- and
coil-winding machines. ... off.
Cutoff and transfer devices for glass tubes. The upper part of a
rotating glass tube is held by a chuck (not shown). When the cutter
cuts the tube to a given length, the mand...
... 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...
... 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 ... retains 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
FLEXURES ACCURA...
... ROLLER CHAINS AND THEIR ADAPTATIONS
Various roller, side-plate and pin configurations for power transmissions, conveying, and elevating.
STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AND CONVEYING
SINGLE ...
5
⁄8 in and smaller have a spring-clip connect-
ing link; those
3
⁄4 in and larger have a cotter pin.
MULTIPLE WIDTH—Similar to single-width chain. It is made in
widths up to...
... 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 ... 5/3/01 1:07 PM Page 345
356
MECHANICAL, GEARED, AND CAMMED
LIMIT SWITCHES
Limit switches are electric current
switching devices that are operated by
some form or mechanical motion...
... 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 ... position)
by a spring within the handle.
To some extend the plunger can slide
forward against the plunger spring, and
the handle can slide backward against the
handle spring. A groo...
... 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...
... 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...