METHOD FOR WEB GUIDING OF CARPET MATERIAL

• US 3,688,804 A
• Filed: 02/02/1970
• Issued: 09/05/1972
• Est. Priority Date: 02/02/1970
• Status: Expired due to Term

• Current Assignee: The KB Mezzanine Fund, L.P.
• Original Assignee: Jerald L. Brown, William O. Harlan
• Inventors: Jerald, L. Brown, William, O. Harlan
• Primary Examiner(s): James Kee Chi
• Application Number:
  US05/007,504
• Time in Patent Office: 946 Days
• Field of Search: 139/1,420,407.1B,391 26/51.5 250/219R,219WE,219S
• US Class Current: 139/1.00R
• CPC Class Codes: D03J 1/00 Auxiliary apparatus combined with or associated with looms
• CPC Class Codes: D03J 2700/06 Auxiliary devices for inspecting, counting or measuring
• CPC Class Codes: D06B 3/36 Drive control
• CPC Class Codes: D06H 1/00 Marking textile materials; Marking in combination with metering or inspecting
• CPC Class Codes: D06H 7/06 Removing selvedge edges

Abstract

A method for guiding a moving web material such as carpet or the like which has continuous longitudinal strands woven in parallel disposition, and which utilizes an invisible dye marker which is not readily apparent to normal viewing of the material after guiding and performance through certain processing stages. The method consists in applying selected luminescent dye marking materials to a selected thread or yarns during production of the web material and then utilizing line guide illumination and sensing responsive to selected luminescence to derive positioning signals which are then utilized through suitable control means to continually maintain lateral web position of the moving web material for trimming, rolling, etc. operations.

Claims

1. A method for web-guiding of a moving web of carpet material for trimming and rolling operations, said web of carpet material having continuous warp components and utilizing invisible dye marking substance having particular luminescence characteristics, comprising the steps of:

weaving a selected warp yarn as one of said warp components along said web of carpet material as a register point at a preselected transverse position of the web proximate the outer edge warp component said selected warp yarn carrying said invisible dye marking substance;

irradiating said moving web proximate said transverse position to cause predetermined luminescence of said dye marking substance;

detecting transverse positional variations in said luminescence indicative of transverse positional variations of said moving web;

generating a control function proportional to said detected transverse positional variations in said luminescence;

re-positioning said moving web in an amount proportional to said control function to counteract said transverse positional variations until said invisible dye marking substance is at said pre-selected transverse position; and

processing including edge trimming of said moving web of carpet material in order to form a carpet edge while maintaining minimal wastage of edge fabric of said carpet material and thus eliminating the need for overcutting with a selected safety margin.

2. A method as set forth in claim 1 Which is further characterized in that:

said invisible dye marking substance is fluorescent, and said irradiation is black light to generate detectable light emanations.

3. A method as set forth in claim 2 which is further characterized in that:

said fluorescent substance is in liquid form and is contained throughout a selected yarn of said moving web continuously therealong.

4. A method as set forth in claim 1 which is further characterized in that:

said invisible dye marking substance is a liquid substance capable of emitting phosphorescent light radiation in response to characteristic irradiation.