OO-S-256K/GEN
6.3.1 Selection of industrial sewing machines. Extreme care should be used in the proper selection of machines, mechanisms, and equipment in order that successful operation and good service will result. Wherever
possible, the exact sewing conditions should be specified in the invitation
for bids, such as:
a. Sewing operation to be performed.
b. Type of material or materials to be stitched.
c. Approximate minimum and maximum thicknesses of material to be stitched, and if machine is to be used to stitch over heavy cross seams.
d. Type and size of sewing thread to be used. e. Any unusual sewing conditions.
f. When in doubt as to the stitch type and class of machine, the feed mechanism style, or other equipment required for a particular sewing operation, the recommendations of the manufacturer should be invited.
g. Buttonhole machines with the shortest range of cut size have the fastest operating cycle. Therefore, maximum efficiency in production is achieved in ordering the machine with the
shortest range that will provide all sizes of buttonholes that are required.
6.3.2 Grouping of components. When sewing machine heads and tables are procured separately rather than as a complete unit, the following divisions of components are applicable.
a. Table top and stand. Included with this item are the following:
1. Transmitter.
2. V-belt and component machine parts.
3. Where required, a knee or foot lifter to raise presser foot of machine.
4. Light wire connector, as applicable, that will mate with the machine head work light lead-in.
5. Starting and stopping motor switch.
6. Motor pulley of correct size to provide the required machine speed.
b. Sewing machine head. Included with this item are the following:
1. Light fixture with bulbs and means for attaching fixture.
2. Light wiring complete with connector and sufficient length of
wire to enable proper light wiring connection.
3. Thread stand.
4. Bobbin winder.
5. Oil drip pan.
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