| 摘要 |
A wire prefeeder has a tower standing on a base. A horizontal upper shaft is mounted fixedly to the upper end of the tower and a plurality of pulleys are on the shaft. A carriage is adapted to in the tower and another horizontal lower shaft which has a plurality of pulleys and is mounted to the carriage in parallelism with the upper shaft. A wire infeed device is driven with an electric motor. Wire feeds to a dancer pulley after which it is looped around the upper and lower pulleys in succession and departs tangentially from a pulley on its way to a wire processing machine which draws the wire. The carriage rises when there is an instantaneous increase in wire tension and an electric signal is produced whose magnitude corresponds to the amount of carriage movement. The motor responds to the signal by changing the motor and wire infeed speed to pay out wire at a rate which keeps the tension in the drawn wire constant. A new type of clamp is provided for coupling a wire reel to a shaft. A unique retainer is provided for preventing the wire from springing off of the pulleys.
|
