Patent GB-190122252-A (GB)
Title: Improvements in "Doffing" Apparatus for Spinning, Doubling and Twisting Machinery used in the Production of Yarns or Threads.
Inventor: STELL ALFRED
Filed: 1901-11-05
Granted: 1902-10-16
Abstract: 22,252. Stell, A., Stell, G., and Stell, J. Nov. 5. Doffing-arrangements for cap frames. The clips for holding the caps and the clips e for holding the bobbins are each provided with flanges for engaging the lower ends of the caps and bobbins respectively, and are both mounted on a rail or carriage f<2>, which can be traversed towards and from the spindles by screws f<6> operated through bevel gearing and a shaft f<9> provided with a handle. The rail f<2> and its operating-mechanism, and also the pegs k for receiving the full bobbins, are mounted on the upper ends of racks g<1>, which are raised and lowered by pinions on a shaft g<3>. The shaft g<3> is rotated through clutch mechanism from a continuously-rotating part, the clutch mechanism being so arranged that it is automatically disengaged at the upper and lower limits of the traverse of the racks g<1> and also at an inter- mediate position which can be regulated. The clutch mechanism can also be engaged and dis- engaged by means of a hand-lever. The empty bobbins are placed on pegs k<2> mounted on a rail k<3>, which can be raised and lowered by rack gearing and a handle on the shaft k<6>. The cap clips are normally closed by means of springs, and, when completely closed, engage with the jaws of the bobbin clips e, so as to close them also. When the caps are held in the jaws of their clips, the bobbin clips are free to be opened sufficiently to release the bobbins, and, when the bobbin clips are opened completely, they also open the cap clips against the motion of their springs. The bobbin clips are opened and closed by means of parallel bars n, n<1>, which are connected respectively with the opposite jaws of each pair, and the lever- mechanism o<4>, o; o<6> is a notched lever for blocking the parts with the jaws in the open position. The racks g<1> are raised to their highest position, the jaws are advanced above the spindles, and the racks again lowered so as to cause the clips to surround the lower ends of the caps and bobbins respectively. The clips are now closed and raised so as to doff the caps and bobbins simultaneously, withdrawn until the bobbins are over the pegs k, and then the bobbin clips are opened sufficiently to allow the full bobbins to drop on to the pegs k, after which the caps are moved over the pegs k<2> and the bobbins thereon are moved upwards within the caps where they are held by the bobbin clips. The closed clips are now caused to carry the caps and bobbins in the reverse manner to that above described on to the spindles, when they are now completely opened and withdrawn from the spindles, during which operation the spring fingers d<4> carried by the cap clips cause the bobbins to rotate slightly and pro- perly engage with the spindles &c., and at the same time the thread is slightly wound on the bobbin. The threads between the full bobbins on the pegs k and the empty bobbins on the spindles are caught in the notches of a rail q, and severed by the longitudinal movement of a second rail q<3> carrying cutters ; p are fingers carried by a longitu- dinally-sliding rail p<1> for moving the threads to the proper sides of the bobbins when starting a fresh set. In a modification, the bobbin clips e are dis- pensed with, the bobbins being supported during their movement by fingers projecting from a longitudinally-sliding rod operated by cams on a rocking shaft provided with a handle, the shaft carrying also cams for opening the cap clips against the action of their springs.