becoming distant from a central line a in the direction of the distance d this is for fine adjustment of the distance d near the central line a the method of adjusting the distance d is merely an example the method of adjusting the distance d between a pair of embroidery fabric support tables 110 may be modified in various manners hereinafter an operation process of the embroidery fabric clamping unit 100 of the embroidery machine 1 will be described in detail with reference to fig5 and 6 first a user may locate a portion of an embroidery fabric e e g shoes to be embroidered between the embroidery fabric support table 110 and the lever 120 in the case of the above described manual manipulation method a user may step on the foot switch not shown to supply air to the pneumatic cylinder 132 the piston 133 is projected by a pneumatic pressure to apply a pressure to the lever 120 precisely the lever insertion part 153 thus the lever 120 may pivot from the release position b of fig5 to the clamping position c where the embroidery fabric e is clamped after the clamping an embroidery command is inputted into the user input part 50 of the embroidery machine 1 to start embroidering when the embroidering is completed the user may step on the foot switch once again to interrupt the pneumatic pressure and thus the lever 120 is restored to the release position b by an elastic force f of the elastic member 153 thereafter the user takes out the embroidery fabric.