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General| Brand | Seiko |
|---|---|
| Model | Keystone STH-8BLD-3 |
| Category | Sewing Machine |
| Language | English |
Install rubber hinge and corner rubber on the sewing machine table.
Fit and secure the oil pan into the designated opening in the table.
Mount the machine head onto the table using hinge connections and corner rubbers.
Insert and tighten the spool pin into its designated hole on the machine.
Assemble and install the knee lifter assembly onto the back of the table.
Mount the V-belt onto the motor and machine pulleys, adjusting tension.
Install the bobbin winder pulley and unit, ensuring proper clearance with the belt.
Install the belt guard (L) to prevent contact with moving parts.
Assemble and securely attach the thread stand to the work table.
Apply lubricating oil to specified points and sliding parts, following safety precautions.
Verify the machine pulley rotates in the correct direction as indicated by the arrow.
Insert the needle into the needle bar with the long groove facing left.
Open the bed slide and remove the bobbin case by pulling the latch.
Wind thread onto the bobbin using the bobbin winder, adjusting winding amount.
Insert the wound bobbin into the bobbin case and then into the rotary hook.
Thread the upper thread through the machine's tension discs and guides.
Adjust stitch length by turning the feed regulating dial to the desired numeric figure.
Start sewing by pulling lower thread up, turning on power, and using the treadle.
Reverse the feed direction using the reverse lever for backtacking.
Adjust upper and lower thread tension using thumb nuts for even stitches.
Adjust presser foot pressure using a screw to hold material firmly.
Adjust the thread controller spring's operating range and tension.
Adjust the maximum height of the feed dog relative to the needle plate.
Adjust the longitudinal position of the feed dog for proper feeding.
Ensure the needle descends into the center of the feed dog's needle hole.
Adjust the timing relationship between the needle and feed dog movement.
Adjust the height of the needle bar to ensure proper needle eye position.
Align the hook point with the needle and set clearances for proper thread loop transfer.
Adjust the gap between the rotary hook opener and the hook projection for thread loop passage.
Adjust clearance between feed forked connection and collar to prevent irregular stitch length.
Adjust the lifting presser foot height for proper material support during sewing.
Adjust the simultaneous or individual movement amount of presser feet for different work.
Check and adjust the vibrating presser foot timing relative to the feed dog.
Adjust the feed regulator to ensure consistent stitch length in forward and reverse.
Procedure to release the safety clutch when thread gets tangled with the rotary hook.
Adjust the spring tension of the safety clutch for proper operation.
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