Sewing machine with supplemental work supporting surface

A sewing machine comprising:

• a main base;
• a base plate vertically separated from said main base;
• a head extending from the main base,
• a needle plate associated with the main base for supporting work fabric in position to be stitched, a line extending between said needle plate and said head, in the plane of said needle plate, defining a first direction,
• a supplemental base connected to the main base through means of link mechanisms placed in a position in which the supplemental base is substantially in a plane including the main base and is immediately contiguous to the main base to present a continuously combined wider flat plane or placed in another position in which the supplemental base is substantially apart from the main base so that the main base is left alone and adapted to support a tubular fabric therearound wherein, said link mechanisms include a pair of parallel and identical length first links separated from one another in said first direction and each pivoted at one end thereof to the base plate for rotation in a plane perpendicular to said first direction, and a second link to which in turn are pivoted said first links at the other ends thereof, said supplemental base being pivotally mounted to the second link, said second link includes an edge portion in abutment with the main base and a wall in abutment with the length of one of the first links to cooperate under influence of gravity with the supplemental base so as to support the supplemental base on the second link in a plane in which lies the main base.