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Apparatus and method for measuring length of moving elongated object
| Details |
Inventors: Jin, Dong Zhi; Kurihara, Kazuro; Abe, Fumihiko;
Assignee: The Furukawa Electric Co., Ltd. (Tokyo, JP)
Primary Examiner: Ramirez; Ellis B.
Assistant Examiner: Stamber; Eric W.
Attorney, Agent or Firm: Nikaido Marmelstein Murray & Oram
A length measuring apparatus for accurately measuring the length of a communication cable or other elongated object in the moving state and a method for the same. The preferable length measuring apparatus is a combination of a marking system and encoder system. The marking system counts the number of times a cable (1) moves by a standard length measurement distance (S) using that standard length measurement distance as one unit. To detect the conveyance of the cable by standard length measurement distances, a marker (43) makes marks (44) on the cable surface and the marks are detected by a laser switch or other sensor (46). The fine differences in distance between the standard length measurement distance and the mark interval (MS), that is, the surplus lengths (C.sub.1), are detected from the value of an encoder at the timing of detection of the marks. The length measuring apparatus body (51) controls the marker and sensor and calculates the final distance of movement of the cable, that is, the measured distance of the cable, by adding the product of the standard length measurement distance and the count to the sum of the above-mentioned surplus lengths. |
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DETAILED DESCRIPTION We claim: 1.
A length measuring apparatus comprising: first and second mark detecting means (45;47, 46:48) which are arranged along a direction of movement of an elongated object, having a front and rear end, at exactly a standard length measurement distance (S) and which detect marks provided on said moving elongated object or marks provided on a tape along with said elongated object; a surplus length measuring means (49;50, 51) which measures a surplus length (C) comprised of the difference of distance between said standard length measurement distance and either distance between one mark and another mark provided on said elongated object or a distance between one mark and another mark provided on a tape; and a computation and control means (51) which is connected to the first and second mark detecting means and surplus length measuring means, which counts the movements of said elongated object by the standard length measurement distance in response to a mark detection signal from the second mark detecting means corresponding to the movement of said elongated object every standard length measurement distance, and calculates the surplus length based on an input from said surplus length measuring means in response to detection of a mark from the first mark detection means.
2.
A length measuring apparatus as set forth in claim 1, wherein said computation and control means calculates a product of the count showing the movements of said elongated object by the standard length measurement distance and said standard length measurement distance when the elongated object has moved by the standard length measurement distance a plurality of times, calculates a sum of the surplus lengths of said plurality of times, adds the product of said count and the standard length measurement distance and the sum of the surplus lengths, and calculates a length of said elongated object.
3.
A length measuring apparatus as set forth in claim 1 or claim 2, wherein said surplus length measuring means measures a continuous distance of movement of said elongated object
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Image Analysis 
