Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Borletti SpA
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Borletti SpA
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Publication date
Application filed by Borletti SpAfiledCriticalBorletti SpA
Priority to ES0250501ApriorityCriticalpatent/ES250501A1/en
Publication of ES250501A1publicationCriticalpatent/ES250501A1/en
Tensioning device of the thread for sewing machines, that is to say a device for the regulation of the tension of the single upper thread, or of the several upper threads of a sewing machine, according to this is intended to work with a single needle or with several needles, of the type in which the pressure discs, between which the thread is passed to make it tighten more or less by them acting thus on its tension, are subjected to the action of a spring arranged behind a wall that is supported on the opposite side on the pressure discs, spring that can be compressed by means of a ring susceptible of axial displacement by the rotation of a tree provided with a single thread on which said ring can be screwed and unscrewed and that after crossing in front of the ring a wall on which pressure discs are supported, passes through such discs and terminates previously in an end button that rests on the back on the discs and having their front face a suitable graduation to indicate the rotation communicated to the shaft with the corresponding displacement of the ring and therefore the degree of tension communicated to the wire, the pressure spring being a coil spring arranged around the shaft or a spring sheet, as desired, characterized in that the supporting body of the device is a single piece, of a suitable material, finding its seat in said body and precisely in its rear part, the pressure spring and in its front, the spring of known type and function, guide and yarn compensation. (Machine-translation by Google Translate, not legally binding)
ES0250501A1959-07-031959-07-03Thread tension device for sewing machines (Machine-translation by Google Translate, not legally binding)
ExpiredES250501A1
(en)