Sewing – Special machines – Embroidering
Patent
1988-08-22
1989-05-30
Feldbaum, Ronald
Sewing
Special machines
Embroidering
D05C 1520
Patent
active
048340057
ABSTRACT:
A tufting machine has an adjustable needle stroke mechanism including an adjustable variable eccentric drive. The output of the drive is applied to a transversely extending oscillatable mainshaft by means of a fixed length rocker arm adjustably clamped to the mainshaft. The mainshaft is adapted to carry rocker arms at each push rod for reciprocating the push rods and thus the needles. The variable eccentric drive includes a circular cam eccentrically disposed between a pair of drive plates mounted on and rotatably driven by a cam shaft. The cam drives a connecting rod for driving the fixed length rocker arm. The cam is connected by bolts to the drive plates extending through holes in the cam and elongated slots in the drive plates. The eccentricity of the cam may be adjusted by moving the cam relative to the cam shaft and securing the bolts at different locations within the drive plate slots. An indicator disk is mounted on the cam shaft and has a plurality of holes at varying distances from the axis of the cam shaft and receives two of the bolts in selected holes to indicate the stroke selected.
REFERENCES:
patent: 3748914 (1973-07-01), Parsons
patent: 3857345 (1974-12-01), Higgins
patent: 4515096 (1985-05-01), Ingram
Feldbaum Ronald
Ruderman Alan
Spencer Wright Industries, Inc.
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