Measuring and testing – Sheet – woven fabric or fiber
Patent
1988-12-08
1990-04-03
Cuchlinski, Jr., William A.
Measuring and testing
Sheet, woven fabric or fiber
177200, 364562, 364567, 364568, G01B 502
Patent
active
049129724
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of determining the length of a flexible web or a string material forming a wound body, such as a roll of web or ribbon material, for example a roll of a web or ribbon of textile, plastic film, paper, cardboard, roofing felt, or the like, or a ball, clew or spool of a string material, such as yarn, thread, wire, rope, chain, or the like.
In shops, department stores, factories and other places where such web or string material is sold or consumed it may be desirable currently or at certain time intervals to determine and register the remaining length of the web or string material in each of the wound bodies from which web or string material has been sold or used, in order to accurately control the amount and/or the value of web and/or string material in stock. Up till now, the length of web or string material left in a wound body, such as a roll of textile material, has been estimated for example by measuring the diameter of the roll. However, this known method has proved to give rather inaccurate results.
The present invention provides a method rendering it possible to determine the length of a flexible web or string material wound into a roll, ball, clew or another wound body very accurately.
Thus, the present invention provides a method of determining the length of a flexible web or string material forming a wound body, said method comprising determining a fist measure of the weight of said web or string material, determining a second measure of the weight of a predetermined length of said web or string material, and calculating the total length of the flexible web or string material on the basis of said predetermined length and said first and second weight measures. Assuming that the weight of a length unit of the web or string material is substantially the same along the length of the web material, the total length of the web or string material may be calculated by multiplying said predetermined length by the ratio of said first weight measure and said second weight measure. The weight or weight measure of a predetermined length of web or string material may be determined once for all, for example by the manufacturer of the web or string material, and in order to determine the total length of the wound web or string material, it is then sufficient to determine said first measure of the weight of the string material. As an example, each wound body may be supported by a supporting member, such as a shaft or core, transferring the weight of the wound body to weight determining means which may, for example, comprise weighing cells, strain gages, etc. Each of these weight determining means may then output a weighing signal which may be transmitted to an electrical control system, such as a computer, which also receives or has received information about the weight of said predetermined length of the various web or string materials. The computer or control system may then currently or at certain time intervals determine and register the length of web or string material in each wound body whereby current information about the amount and/or value of each of the various kinds of web or string material is easily available. Because the weight of a length unit of the web or string material may vary substantially during storage, for example dependent on the humidity of the ambient atmosphere, said second weight measure of the predetermined length of web or string material may, alternatively, be determined substantially at the same time as said first weight measure. The predetermined length of material may then be cut from a free end portion of the wound body prior to determining said second weight measure. In the preferred embodiment, said predetermined length is a length of a free end portion of the wound web or string material, said second weight measure being determined while said predetermined length is connected to said wound body. The wound body may then be placed on a specially designed weighing apparatus which may determine said first and second weight measures substa
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Dovmark Johan
Gregersen Johan C.
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Jens Reumert
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