Patent GB-190904765-A (GB)
Title: Improvements in Means for Producing Periodic Alterations of the Speed of a Machine.
Inventor: BUCHWALD JOHANNES REINHARD
IPC: F16H27/04
Filed: 1909-02-26
Granted: 1909-07-22
Abstract: 4765. Buchwald, J. R. Feb. 29, 1908, [Convention date]. D r i v i n g - a r r a n g em e n t s ; building- motions.-A device for producing periodic variations in the speed of a machine driven from a member rotating with substantially constant velocity comprises a differential gear arranged so that one of its members drives a further member, the resistance and inertia of which forms a permanent resistance to the rotation of said member, and which may also be sujected to a periodically varied braking - action. The device is described as applied to a ring-spinning frame in order to produce the requisite variation in the speed of the spindles during the building of the cop, the variation being governed by the rise and fall of the ring-rail. The differential gearing comprises bevelwheels 1, 2, Fig. 2, the former carried by the shaft 6, the speed of which is to be varied, and the latter by a sleeve on which the pulley 10, which is driven at a substantially constant speed, is mounted. Planet-wheels 3, 4 are carried by a wheel 11, which is mounted on a sleeve 7 secured to the bearing 9. The rim of the carrier 11 is provided with teeth to engage with a screw 12 on a shaft 13. The speed of the shaft 6 is greatest when the carrier 11 is held fast, and diminishes as the carrier is allowed to rotate. The variations in the speed of the shaft 6 are produced by a friction band, the tension in which can be varied, and which passes over a pulley on the shaft 13. The resistance of the screw gearing and the inertia of the shaft 13 form a permanent resistance which can be increased by adding weights, or by a loaded brake band, to increase the sensitiveness of the device and to prevent the velocity of the carrier from becoming too great when the variable brake is removed. When applied to a ring-spinning frame, the differential gearing 1, 2, 3, 4, 11, Fig. 3, is mounted upon the tin-roller shaft 6. Motion is supplied to the gearing from a shaft 20, which drives the drawing - roller shaft 21, and also a wheel 23 which operates the building-motion. A cam 24, on the same axis as the wheel 23, rocks a lever 26 about its axis 27. A second lever 28 is pivoted about the same axis and made to rock with the lever 26 by a cam 34 and a. bowl 35, and to its lower end there is connected a steel band 30, the other end of which is attached to a drum 36. A second band 31 is attached to the drum and to a segment 38 carried by a bell-crank 39, which supports the ring-rail 41 by a rod 40<a>, The friction band 18, which passes over the pulley 17 on the shaft 13 to govern the motion of the carrier 11 in the differential gear, is connected at one end to the pin 43 in a slot in the wheel 23, and at the other end to a rod 45 passing through a fixed bracket 47 and provided with a spring 48 and nuts 49, 50. As the wheel 23 rotates in the direction shown by the arrow f from the position 43 to the position 51, the ring-rail is lowered and the friction band 18 is tensioned against the action of the spring 48, thus braking the disk 17, and causing the velocity of the. spindles to increase. As the wheel 23 rotates to the position 53, the ring-rail rises and the friction band is slackened, the nut 50 finally coming to rest on the bracket 47. As the band is slackened, the wheel 17 commences to rotate, the velocity of the spindles consequently decreasing. During further rotation of the wheel 23, the friction band 18 is slack and does not engage the wheel 17, the velocity of rotation of which therefore gradually increases, causing the velocity of the spindles to decrease until the top of the cone of the cop is reached. In starting a new cop, the cam 34 carried by the lever 26 is caused to rotate gradually, thus moving the lever 28, rotating the drum 36 step by step, on the completion of each conical layer, and causing the lifting- rail to commence each layer at a slightly higher level. It being necessary during this process to drive the spindle at a slow speed, the friction brake band 18 is put out of action by a cam 59 on the drum 36 engaging a lever 65 and raising the rod 45.