OO-S-256K/GEN
3.5.1.1 Motor starters. All sewing machines shall be equipped with a manual, full voltage, a/c, single phase, nonreversing starter suitable for use with fractional horsepower motors. The heater coil shall be sized for a full load current of 8 amps. The unit shall be supplied in a NEMA ISC 6, Type-I enclosure and meet or exceed the requirement of UL 508.
3.5.2 Transmitter, electric. The electric transmitter shall be an electric motor and friction clutch built into one complete self-contained driving unit. The clutch shall be actuated by a screw, or a lever, which thrusts the clutch wheel in contact with a continuous running flywheel mounted on the motor rotor, with a friction disc or lining between and mounted on either the clutch wheel or flywheel, permitting speed of the machine to be controlled by the operator. The clutch shall be ball-bearing mounted and shall have a positive acting brake arrangement to stop the machine when the clutch is disengaged by the operator. Adjustment design shall provide for regulating the tolerances between the clutch and brake actions. An adjustable pitman rod shall be provided between the clutch and foot treadle of the stand. For V-belt drive, an adequate belt adapter or arrangement shall be provided with the electric transmitter to give adjustment for proper belt tension.
3.5.3 Belts, drive. Unless otherwise specified in the detail specification, the drive belts shall be V-type.
3.5.4 Electric light fixture. The sewing machine lamp shall be constructed from UL electrical components. The lead wires shall be high temperature rated (105°C). The arm shall be a minimum of 22 inches long. It shall be constructed from a goose neck type flexible chrome plated steel. The unit shall have a metal air cooled enamel finished cone shape
reflector. The light shall be supplied complete with a means for machine or table mounting. The light shall operate on 110 volt AC power. The power
cord shall be permanently connected to the energized terminals of the motor starter switch. The light shall have an independent switch.
3.5.5 Stands. The stands, unless otherwise specified in the detail specifications, shall be fabricated from minimum 13-gauge steel channels. The steel shall conform to ASTM A1008/A1008M. The stands shall be supplied with heavy duty adjustable H type legs which are of welded construction. The top and feet of the stand shall be furnished with holes for fastening
to wooden blocking and table tops. Each stand shall come complete with back
and bottom braces. The bottom brace shall be slotted for treadle adjustment.
3.5.6 Treadles. The foot treadle or treadles shall be mounted on a bar or brace which is fastened to the stand near its base for operation control of the machine. Means shall be provided to allow the position of the treadles to be adjusted to meet the needs of the machine operator.
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