US 2020/0370213 A1Published application

A device and a method for sensing breakage or end of warp yarn for a fabric weaving loom

AssigneeSiddharth Lohia

InventorSiddharth Lohia

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Abstract

The invention is a warp breakage/end sensing system and a device to detect end of a miming yarn on a CWM used to make endless tubular fabric. The device of the invention incorporates a mechanism which causes a notification in the form of a signal (indicating yarn breakage or yarn end) to be sent to the loom operator in the situation where a yarn breakage is detected. The device employs a drop wire (6) which loses its elevation and falls (under its self-weight) from its normal operative position. The drop causes a first element (7) to rotate and come in contact (physical or non-physical) with a second element (8), thereby completing an electric circuit and sending a yarn breakage signal to the operator. Upon restoration of the yarn, the first element restores to its normal working position. In the case of a non-physical contact, the first sensing element enters the triggering region of the second sensing element thus causing a signal to be sent.

Claims22

Dependent claims

A device for sensing end of warp yarn or tape on a circular weaving machine (CWM) or a weaving loom, said device comprises a yarn-end detection means to detect the breakage of or end in said running yarn, and a notification means to notify breakage of or end of yarn, said yarn-end detection means comprising a first element provided with a number of cavities/openings each of said cavity/opening corresponding to a drop wire that is provided corresponding to each individual yarn, each said drop wire passing through one of said cavity/opening, and said drop wire having a loop or an eye for passage of said warp yarn, said drop wire being held in its normal operating position due to tension in said running yarn warp, characterized in that:

said drop wire is provided with a motion restrictor element,
a second element having holes is provided, one hole being provided for each of said drop wires, through which corresponding said drop wires pass,
a first sensing element is affixed to said first element,
a second sensing element is affixed to said second element,
wherein said first element is rotatable at its ends, and wherein, subsequent to the falling of said drop wire from its normal operating position due to substantial loss of tension in said warp yarn, the fall of said drop wire is halted by said motion restrictor element being obstructed by cavity/opening, whereby said first element rotates to establish a contact between said first and second sensing elements, and in the case where said contact remains in place for longer than a predetermined period, whereafter a signal is sent to the loom operator indicating malfunction of said loom.

2 more elements

Dependencies are inferred from the claim text.