Patent GB-190905135-A (GB)
Title: Improvements in and relating to Automatic "Doffers" for Spinning Frames.
Inventor: NEWSHOLME NORMAN ROBERT
IPC: D01H9/04
Filed: 1909-03-03
Granted: 1909-09-09
Abstract: 5135. Newsholme, N. R. March 3. Doffing- - arrangements; bobbin - applying apparatus; thread - severing arrangements. - Relates to doffing-arrangements for spinning- machines, particularly to that class wherein timing cams and clutches are used to actuate the various devices, an example of which is described in Specification 21,697/07. The cam shaft c is operated from a shaft B<4> which is rotated by a chain A<4> from the loose pulley, the clutch B<1> being put into gear and the belt moved on to the loose pulley by the setting-on rod. The frame is driven at determined periods during doffing by a chain operated by a clutch and cam 1 so as to supply the necessary slack yarn when the bobbins are removed, to wind a few turns on the empty bobbin, and to facilitate the removal and replacement of the flyer. The peg rail is connected by a chain E' with a lever E, which is operated by a cam 2. The step rail is lifted and lowered by racks which are engaged by pinions on a shaft F<3>. The cam levers controlling the clutches operating the shaft F<3> engage projections on the step rail, as described in the above-mentioned Specification, so as to ensure the clutches being thrown out of gear at the proper times. The bobbin and flyer holders are advanced and retracted by racks G' and pinions operated from the cam shafts by quadrant levers G, Fig. 4. The lifter rail is operated by a chain J<6> connected with a camlever which is engaged by the screwed shaft J' of the lifter motion. The flyer holders are provided with unequal arms and a recess H<4> as described in the above-mentioned Specification, and the flyers and spindles are connected together by a pin and slot. The flyer holders are advanced and take hold of the flyers, the spindles being turned automatically so as to ensure the alinement of the flyers with the slots H<4>. The step and lifter rail are lowered and the flyer holder is further advanced until the depending peg H<2> is vertically over the bobbin; the lifter rail is then raised until the peg takes into the bobbin, and a bobbin holder or wedge rail G<8>. is advanced to support the bobbin at its base. To facilitate this operation, a projection L<2> on the lifter rail engages a projection L<4> and so tilts it, thereby allowing the wedge rail to enter between the bobbin and the lifter rail. The lifter and step rails are lowered and the flyer holder and wedge rail are advanced until the bobbin is centred over the outer peg P', the peg rail being slightly raised and the wedge rail retracted so that the full bobbin falls on to the peg. The machine is driven by the mechanism operated by the cam 1 during this operation to give the necessary slack yarn. The peg rail is elevated, thereby rotating a spring cutter bar K<2> by means of a pinion rotating on a fixed rack K<5>, until it rests on a projection K<6> on the flyer holder. This movement causes the peg H<2> to engage the empty bobbin which is on the peg P; the wedge rail is advanced to take under the empty bobbin and the peg rail is lowered, and the bobbin thus held is retracted until it is over the spindle. The wedge rail is withdrawn so that the bobbin drops on to the spindle, the lifter and step rails are raised so that the flyer is replaced, and the machine is rotated so as to wind a few turns round the empty bobbin. The cutter bar, being released by the flyer holder, falls and severs the thread. A spring on the cutter bar tends to hold or wedge the bobbin as the bar falls.