Elongation measuring apparatus, elongation measurement system, and non-transitory medium

An elongation mesuring appratus for measuring an elongation of a chain based on a taken image of the chain in which a plurality of inner links and a plurality of outer links are alternately connected to each other by internally fitting pins of the outer links into cylindrical bushings of the inner links,

• the elongation mesuring appratus comprising:
• an inter-pin distance calculation section for calculating adjacent inter-pin distances based on an image of the three or more aligned pins;
• a pitch calculation section for calculating a pitch of the outer link and a pitch of the inner link based on the calculated inter-pin distances;
• and
• an elongation calculation section for calculating the elongation of the chain based on the calculated pitches of the outer and inner links.

An elongation measurement system comprising:

• a terminal device for taking an image of a chain in which a plurality of inner links and a plurality of outer links are alternately connected to each other by internally fitting pins of the outer links into cylindrical bushings of the inner links;
• and
• a server for calculating an elongation of the chain based on the image of the chain taken by the terminal device,
• wherein the server includes:
• an inter-pin distance calculation section for calculating adjacent inter-pin distances based on an image of the three or more aligned pins;
• a pitch calculation section for calculating a pitch of the outer link and a pitch of the inner link based on the calculated inter-pin distances;
• and
• an elongation calculation section for calculating the elongation of the chain based on the calculated pitches of the outer and inner links.

A non-transitory computer-readable medium recording a computer program,

• the computer program comprising steps of:
• allowing the computer to calculate an elongation of a chain based on a taken image of the chain in which a plurality of inner links and a plurality of outer links are alternately connected to each other by internally fitting pins of the outer links into cylindrical bushings of the inner links;
• allowing the computer to calculate adjacent inter-pin distances based on an image of the three or more aligned pins;
• allowing the computer to calculate a pitch of the outer link and a pitch of the inner link based on the calculated inter-pin distances;
• and
• allowing the computer to calculate the elongation of the chain based on the calculated pitches of the outer and inner links.