OO-S-256 Sewing Machine, Industrial, General Specification ForThis specification covers the general requirements for commercial, industrial sewing machines used in the textile and leather industry. The specific requirements for the individual sewing machines are covered by the detail specifications listed in 6.6.

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OO-S-256K/GEN

3.5.14 Spare parts. Spare parts shall be furnished when specified in the detail specification.

3.5.15  Lubricated semi-automatically.  Semi-automatically lubricated machines shall be equipped with covered oil reservoirs and oil level gauges.  The reservoirs shall be sufficiently gasketed to prevent oil from leaking out of machines used in the mobile vehicles.  The rotating loop taker (hook) shall be automatically lubricated by means of an oil filler

crankcase equipped with a metered control valve to regulate the oil flow to

the rotating loop taker.  The upper arm shaft bearings shall be lubricated by means of a reservoir and oil wick capillary action system.  The lower shaft bearings shall be lubricated by means of a manual oil wick capillary action system.  Manual lubrication may be provided for various parts of the machine head which are inaccessible for the semi-automatic lubrication system.  These lubrication points shall be identified by using the work "oil" or by color coding oil ports.

3.6 Performance.

3.6.1 Operation. The sewing machines, unless otherwise specified in the detail specifications, shall conform to the following requirements when tested as specified in 4.5.1:

a. Stitch formation for compliance with stitch types specified for applicable types of machines.

b. Stitch range, stitches per inch and stitch widths where applicable for various kinds of feed for all machines except the buttonhole, button sewing, and tacking machines.

c. Number of stitches and make up of buttonholes, tacks, and button sewing to comply with requirements of these machines.

3.6.2 Bobbin winder, operation. The sewing machines, while stitching, shall permit the winding of the bobbin when tested as specified in 4.5.2.

3.6.3 Tension release. The sewing machines shall comply with 3.5.13 when tested as specified in 4.5.3.

3.7 Fasteners and finish. Fasteners and finish shall be in accordance with manufacturers' commercial practice.

3.8 Tools and accessories. Tools and accessories normally supplied by the manufacturer shall be furnished with each machine.

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