guard means a barrier requiring
adjustment for each job or die setup.
Antirepeat means the part of
the clutch/brake control system designed to limit the press to
a single stroke if the tripping means is held operated.
Antirepeat requires release of all tripping mechanisms before
another stroke can be initiated. Antirepeat is also called
single stroke reset or reset circuit.
Authorized person means one to
whom the authority and responsibility to perform a specific
assignment has been given by the employer.
Automatic feeding means feeding
wherein the material or part being processed is placed within
or removed from the point of operation by a method or means not
requiring action by an operator on each stroke of the
Belts include all power
transmission belts, such as flat belts, round belts, V-belts,
etc., unless otherwise specified.
Belt shifter means a device
for mechanically shifting belts from tight to loose pulleys or
vice versa, or for shifting belts on cones of speed
Belt pole (sometimes called a
belt shipper or shipper pole) means a device used in shifting
belts on and off fixed pulleys on line or countershaft where
there are no loose pulleys.
Bolster plate means the plate
attached to the top of the bed of the press having drilled
holes or T-slots for attaching the lower die or die shoe.
Brake means the mechanism used
on a mechanical power press to stop and/or hold the crankshaft,
either directly or through a gear train, when the clutch is
Brake Monitor means a sensor
designed, constructed, and arranged to monitor the
effectiveness of the press braking system.
Clutch means the coupling
mechanism used on a mechanical power press to couple the
flywheel to the crankshaft, either directly or through a gear
Concurrent means acting in
conjunction, and is used to describe a situation wherein two or
more controls exist in an operated condition at the same
Continuous means uninterrupted
multiple strokes of the slide without intervening stops (or
other clutch control action) at the end of individual
Control System means sensors,
manual input and mode selection elements, interlocking and
decision-making circuitry, and output elements to press
Counterbalance means the
mechanism that is used to balance or support the weight of the
connecting rods, slide, and slide attachments.
Device means a press control
or attachment that:
(i) Restrains the operator from inadvertently reaching into the
point of operation; or
(ii) Prevents normal press operation if the operator’s hands
are inadvertently within the point of operation; or
(iii) Automatically withdraws the operator’s hands, if the
operator’s hands are inadvertently within the point of
oper-ation as the dies close.
Die means the tooling used in
a press for cutting or forming material. An upper and a lower
die make a complete set.
Die builder means any person
who builds dies for power presses.
Die enclosure guard means an
enclosure attached to the die shoe or stripper, or both, in a
Die set means a tool holder
held in alignment by guide posts and bushings and consisting of
a lower shoe, an upper shoe or punch holder, and guide posts
Die setter means an individual
who places or removes dies in or from mechanical power presses,
and who, as a part of his duties, makes the necessary
adjustments to cause the tool-ing to function properly and
Die setting means the process
of placing or removing dies in or from a mechanical power
press, and the process of adjust-ing the dies, other tooling
and safeguarding means to cause them to function properly and
Die shoe means a plate or
block upon which a die holder is mounted. A die shoe functions
primarily as a base for the complete die assembly, and, when
used, is bolted or clamped to the bolster plate or the face of
Direct drive means the type
driving arrangement wherein no clutch is used; coupling and
decoupling of the driving torque is accomplished by energizing
and deenergization of a motor. Even though not employing a
clutch, direct drives match the operational characteristics of
“part revolution clutches” because the driving power may be
disengaged during the stroke of the press.
Exposed to contact means that
the location of an object is such that a person is likely to
come into contact with it and be injured.
Ejector means a mechanism for
removing work or material from between the dies.
Face of slide means the bottom
surface of the slide to which the punch or upper die is
Feeding means the process of
placing or removing material within or from the point of
Fixed barrier guard means a
die space barrier attached to the press frame.
Flywheels include flywheels,
balance wheels, and flywheel pul-leys mounted and revolving on
crankshaft of engine or other shafting.
Foot control means the foot
operated control mechanism designed to be used with a clutch or
clutch/brake control system.
Foot pedal means the foot
operated lever designed to operate the mechanical linkage that
trips a full revolution clutch.
Full-revolution clutch means a
type of clutch that, when tripped, cannot be disengaged until
the crankshaft has completed a full revolution and the press
slide a full stroke.
Gate or movable barrier device
means a movable barrier arranged to enclose the point of
operation before the press stroke can be started.
Guard means a barrier that prevents
entry of the operator’s hands or fingers into the point of
Guide post means the pin attached
to the upper or lower die shoe, operating within the bushing on
the opposing die shoe, to maintain the alignment of the upper
and lower dies.
Hand feeding tool means any
hand-held tool designed for placing or removing material or
parts to be processed within or from the point of
Holdout or restraint device means a
mechanism, including attachments for operator’s hands, that
when anchored and adjusted prevent the operator’s hands from
entering the point of operation.
Inch means an intermittent motion
imparted to the slide (on machines using part revolution
clutches) by momentary operation of the “Inch” operating means.
Operation of the “Inch” operating means engages the driving
clutch so that a small portion of one stroke or indefinite
stroking can occur, depending upon the length of time the
“Inch” operating means is held operated. “Inch” is a function
used by the die setter for setup of dies and tooling, but is
not intended for use during production operations by the
Interlocked press barrier guard
means a barrier attached to the press frame and interlocked so
that the press stroke cannot be started normally unless the
guard itself, or its hinged or movable sections, enclose the
point of operation.
Jog means an intermittent
motion imparted to the slide by momentary operation of the
drive motor, after the clutch is engaged with the flywheel at
Knockout means a mechanism for
releasing material from either die.
Liftout means the mechanism also
known as knockout.
Maintenance runway means any
permanent runway or plat-form used for oiling, maintenance,
running adjustment, or repair work, but not for passageway.
Manual feeding means feeding
wherein the material or part being processed is handled by the
operator on each stroke of the press.
Nip-point belt and pulley
guard means a device which encloses the
pulley and is provided with rounded or rolled edge slots
through which the belt passes.
Operator’s station means the
complete complement of controls used by or available to an
operator on a given operation for stroking the press.
Part-revolution clutch means a
type of clutch that can be dis-engaged at any point before the
crankshaft has completed a full revolution and the press slide
a full stroke.
Pinch point means any point
other than the point of operation at which it is possible for a
part of the body to be caught between the moving parts of a
press or auxiliary equipment, or between moving and stationary
parts of a press or auxiliary equipment or between the material
and moving part or parts of the press or auxiliary
Point of operation means the area
of the press where material is actually positioned and work is
being performed during any process such as shearing, punching,
forming, or assembling.
Presence-sensing device means a
device designed, constructed and arranged to create a sensing
field or area and to deactivate the clutch control of the press
when an operator’s hand or any other part of his body is within
such field or area.
Press means a mechanically
powered machine that shears, punches, forms or assembles metal
or other material by means of cutting, shaping, or combination
dies attached to slides. A press consists of a stationary bed
or anvil, and a slide (or slides) having a controlled
reciprocating motion toward and away from the bed surface, the
slide being guided in a definite path by the frame of the
press. as a source of power.
Pullout device means a
mechanism attached to the operator’s hands and connected to the
upper die or slide of the press, that is designed, when
properly adjusted, to withdraw the operator’s hands as the dies
close, if the operator’s hands are inadvertently within the
point of operation.
Repeat means an unintended or
unexpected successive stroke of the press resulting from a
Safety block means a prop that, when
inserted between the upper and lower dies or between the
bolster plate and the face of the slide, prevents the slide
from falling of its own deadweight.
Safety system means the
integrated total system, including the pertinent elements of
the press, the controls, the safeguarding and any required
supplemental safeguarding, and their interfaces with the
operator, and the environment, designed, constructed and
arranged to operate together as a unit, such that a single
failure or single operating error will not cause injury to
personnel due to point of operation hazards.
Semiautomatic feeding means
feeding wherein the material or part being processed is placed
within or removed from the point of operation by an auxiliary
means controlled by the operator on each stroke of the
Sheaves mean grooved pulleys,
and shall be so classified unless used as flywheels.
Single stroke means one complete
stroke of the slide, usually initiated from a full open (or up)
position, followed by closing (or down), and then a return to
the full open position.
Single-stroke mechanism means
an arrangement used on a full-revolution clutch to limit the
travel of the slide to one complete stroke at each engagement
of the clutch.
Slide means the main
reciprocating press member. A slide is also called a ram,
plunger, or platen.
Stop control means an operator
control designed to immediately deactivate the clutch control
and activate the brake to stop slide motion.
Stripper means a mechanism or
die part for removing the parts or material from the punch.
Stroking selector means the part
of the clutch/brake control that determines the type of
stroking when the operating means is actuated. The stroking
selector generally includes positions for Off (Clutch Control),
Inch, Single Stroke, and Continuous (when Continuous is
Sweep device means a single or
double arm (rod) attached to the upper die or slide of the
press and designed to move the oper-ator’s hands to a safe
position as the dies close, if the operator’s hands are
inadvertently within the point of operation.
Trip or (tripping) means
activation of the clutch to “run” the press.
Turnover bar means a bar used in
die setting to manually turn the crankshaft of the press.
Two-hand trip means a clutch
actuating means requiring the concurrent use of both hands of
the operator to trip the press.
Two-hand control device means
a two-hand trip that further requires concurrent pressure from
both hands of the operator during a substantial part of the
die-closing portion of the stroke of the press.
Unitized tooling means a type of
die in which the upper and lower members are incorporated into
self-contained units arranged as to hold the die members in