Humanshavesewnbyhandforthousandsofyears．Itwassaidthatthefirstthreadwasmadefromanimalmuscleandsinew．Andtheearliestneedlesweremadefrombones．Sincethoseearlydays，manypeoplehavebeeninvolvedintheprocessofdeve

　　Humans have sewn by hand for thousands of years．It was said that the first thread was made from animal muscle and sinew．And the earliest needles were made from bones．Since those early days，many people have been involved in the process of developing a machine that could do the same thing more quickly and with greater efficiency．

　　Charles Wiesenthal，who was born in Germany，designed and received a patent on a double-pointed needle that eliminated the need to turn the needle around with each stitch（缝合） in England in 1755．Other inventors of that time tried to develop a functional sewing machine，but each design had at least one serious imperfection．

　　Frenchman Barthelemy Thimonnier finally engineered a machine that really worked．However，he was nearly killed by a group of angry tailors when they burned down his garment factory．They feared that they would lose their jobs to the machine．

　　American inventor Elias Howe，born on July 9，1819，was awarded a patent for a method of sewing that used thread from two different sources．Howe's machine had a needle with an eye at the point，and it used the two threads to make a special stitch called a lockstitch．However，Howe faced difficulty in finding buyers for his machines in America．In frustration，he traveled to England to try to sell his invention there．When he finally returned home，he found that dozens of manufacturers were adapting his discovery for use in their own sewing machines．

　　Isaac Singer，another American inventor，was also a manufacturer who made improvements to the design of sewing machines．He invented an up-and-down-motion mechanism that replaced the side-to-side machines．He also developed a foot treadle（脚踏板） to power his machine．This improvement left the sewer's hands free．Undoubtedly，it was a huge improvement of the hand-cranked machine of the past．Soon the Singer sewing machine achieved more fame than the others for it was more practical，it could be adapted to home use and it could be