Force detector for weighing and pricing machine - has communicating stress bar in detecting block with automatic self deformation and temp. compensation

摘要

The operation of measuring weight is simplified by the elimination of mechanical complications inherent in many scale balances of the articulated parallelogram type. The device also has the advantage of including automatic compensation for self deformation and thermal expansion. A block with accurately machined holes and communicating slits (1) distors as a parallelepiped under the action of an applied force (3). The strain, which is communicated to the fixed side of the block (2) by a stress bar (4), is measured by electrical gauges of the resistance type mounted on the inner surface of the cylindrical hole (5) which constitutes the geometric centre of rotational deformation. The stiffness of the block can be reduced by removal of ribs attached to the upper side (15).