JPS6484827A - Gripping distance adjusting mechanism in bag opening gripping apparatus - Google Patents

Abstract

PURPOSE:To maintain a proper gripping position between gripping portions of both clamps, even in the case of bags of differing widths, by movably supporting a movable plate using a moving wire upon the movement of these clamps toward and away from each other and providing a stopper against which engageable portions on the movable plate are urged against by the forces applied against the clamps upon the positioning of an adjusting plate. CONSTITUTION:Both clamps 23 are energized toward each other by coiled tension springs 42, a movable plate 34 is pulled toward the center of a rotary disk 4 by a wire 40 and a cam roller 36 under the movable plate 34 is always pressed against the outer peripheral surface of a cam plate 6 (stopper portion). Upon positioning of an adjusting plate 38, the movable plate 34 moves toward the center of the rotary disk 4 until the cam roller 36 under the movable plate 34 is pressed into contact with the peripheral surface of the cam plate 6 by the coiled tension springs 42, thereby defining the distance between the two clamps 23. Upon relocation of the adjusting plate 38, the positions of both clamps 23 also change, with the subsequent change in the distance therebetween. During this time, both clamps 23 move parallel to each other and, therefore, the gripping position between the gripping plates 17 of the clamps 23 and the gripping blocks 19 thereof remain unchanged.