Process for unwinding a thread from a reel in looms, and arrangement used therefor

In an apparatus for unwinding a thread from a reel used in a weaving loom wherein the variation in stress of said thread during unwinding is minimized, said apparatus including a reel upon which said thread is wound, a thread guide positioned at a distance from said reel, said thread being pulled through said thread guide as it is pulled from said reel;

• the improvement comprising:
• means for adjusting said distance of said thread guide from said reel;
• means for determining the variation in tension of said thread and generating a thread tension signal;
• and
• a processing unit having means providing communication between said tension determining device, said processing unit, and said adjusting mechanisms, said processing unit arranged to receive said thread tension signal and, in response to said thread tension signal, to generate a thread guide distance signal that corresponds to a distance between the thread guide and the reel whereat stress variation in the thread during its unwinding from the reel is minimized, said adjusting means being arranged to receive said thread guide distance signal and to position the thread guide at said distance in response to said thread guide distance signal.

In an apparatus for unwinding a thread from a reel used in a weaving loom wherein the variation in stress of said thread during unwinding is minimized, said apparatus including a reel upon which said thread is wound, a thread guide positioned at a distance from said reel, said thread being pulled through said thread guide as it is pulled from said reel;

• the improvement comprising:
• means for adjusting said distance of said thread guide from said reel;
• means for determining the diameter of said reel and for generating a reel diameter signal;
• and
• a processing unit having means for providing communication between said reel diameter determining device, said processing unit, and said adjusting mechanism, said processing unit arranged to receive said reel diameter signal, and, in response to said reel diameter signal, to generate a thread guide distance signal that corresponds to a distance between said thread guide and the reel whereat stress variation in the thread during its unwinding from the reel is minimized, said adjusting mechanism being arranged to receive said thread guide distance signal and to position the thread guide at said distance.

In an apparatus for unwinding a thread from a reel used in a weaving loom in a manner whereby the stress of said thread during unwinding is minimized, said apapratus including a reel stand having two reels mounted thereon, a thread guide arranged to receive thread from either of said reels, thread from either reel being pulled through said thread guide as it is pulled from either reel;

• the improvement comprising:
• a mechanism for adjusting said distance of said thread guide from said reels;
• a device for determining the variation in tension of said thread and generating a thread tension signal;
• and
• a processing unit having means providing communication between said thread tension variation determining device, said processing unit, and said adjusting mechanism, said processing unit arranged to receive said thread tension signal and, in response to said thread tension signal, to generate a thread guide distance signal that corresponds to a distance between the thread guide and the reels whereat stress variation in the thread during its winding from each reel is minimized, said adjusting mechanism being arranged to receive said thread guide distance signal and to position the thread guide at said distance during unwinding of thread from each reel.