Patent GB-191511236-A (GB)
Title: Improvements in and relating to Embroidering Machines.
Inventor: GROEBLI JOSEPH ARNOLD
IPC: D05C9/06
Filed: 1915-08-04
Abstract: 11,236. Groebli, J. A. Aug. 4. Embroidery machines.- The fabric is carried in the work-frame on rollers, and automatic devices are provided for shifting the fabric when a pattern is completed. These devices untension the fabric laterally and longitudinally, reel the fabric from one roller to the other to a pre-determined extent, and re-tension the fabric longitudinally and laterally. Also, while the fabric is being reeled, the work-frame is moved in the direction opposite to that of the fabric to bring it to its initial position, so that the fabric itself remains substantially stationary. The apparatus is brought to a standstill at the completion of each stage in the operation, and that completion initiates the commencement of the succeeding stage. The fabric is wound off rollers 55 on to rollers 52 when the shaft 11 is rotated. The shaft is geared to the rollers so that the winding-on rollers 52 move more rapidly than the winding-off rollers 55, and thereby the fabric is kept taut. The rollers 52 are driven through a friction coupling 338, which slips if the tension of the fabric becomes too great. The fabric is tensioned longitudinally after the reeling is completed, by means of a shaft 10, worm-wheels 35, 65, and spindles 37, 64 which screw into the worm-wheels. The spindle 37 supports the upper rollers 52 and moves them upward to stretch the fabric. The spindle 64 carries the brackets in which the reeling- worms 53 are mounted, and, by moving the worms axially give fabric-stretching rotary movements to the rollers 55. The fabric is stretched laterally by means of a shaft 9, barbed vertical rollers on shafts 20, and sets of rollers 27 which are moved toward the barbed rollers to press the fabric on to the barbs. The shafts 9, 10, 11 are connected by universally jointed and telescopic shafts 70, 71, 72 to shafts 73, 74, 230 mounted upon a fixed horizontal platform 66 at one side of the vertical workframe, and these latter shafts are geared to members 80 and 81, 82 and 83, 84 and 85 of clutches 90 .. 95 on a shaft 75 so that they can be rotated in turn and in either direction. The clutch 90 is controlled manually and drives the shaft 11 when the fabric is to be unreeled. During a fabric shifting operation, the shaft 75 is driven continuously by means of an electric motor 69, and the clutches 93, 95, 91, 94, 92 are put into operation in turn by mechanisms actuated by a cam 119, which is given one sixth of a revolution at the completion of each stage of the operation. Such movement is transmitted to the cam from a lever 155, which is continuously oscillated by a crank and pitman connexion with the shaft 75, by devices which couple a ratchet pawl to the lever for one oscillation only when the devices are tripped into operation. The first tripping takes place as the switch controlling the motor 69 is closed by hand, and the first movement of the cam 119 closes the clutch 93. This turns the shaft 74 to release the edges of the fabric until a nut 205 upon a screwed portion of the shaft reaches a lug upon a slidable bar and thereby turns a snap-lever 213. The lever 213 is coupled by a rod 218 to a bar by which the trip lever 172 is tripped, and a second movement of the cam 119 is occasioned. This second movement opens the clutch 93 and closes the clutch 95, by which the shaft 230 is positively rotated to remove the longitudinal tension of the fabric. A third movement of the cam puts in the clutch 91 in place of the clutch 95, and the fabric rollers are actuated to reel the fabric. The shaft 73 is geared to a shaft 342, which meantime has been coupled manually to the work-frame shifting gear, so that as the fabric is wound upwards the frame moves downward. The length of fabric reeled is measured by a roller 59 lowered into contact with the fabric for that purpose, and the rotation of the roller is communicated to a shaft 295 by a shaft 289 and screw gear 301. When the predetermined length has been reeled, an adjusted stop on a disk 303 brings the trip 172 into operation. This occasions a fourth movement of the cam 119, which opens the clutch 91 to stop the reeling and closes the clutch 94 for the longitudinal re-tensioning. By this clutch a shaft 98 is rotated and its movement is communicated positively to the shaft 230 until a nut upon a screwed spindle 256 reaches a lever 278 and removes a latch connexion between the shaft 230 and a yoke 234, by which axial movement of the yoke upon the shaft is normally prevented. Thereafter, the shaft 230 continues to rotate until the resistance due to the tension of the fabric causes a roller on the yoke 234 to ride out of a cam-hollow in the disk 241 on the shaft 98, and thereby the yoke is moved axially and is brought into engagement with a lever by which the lever 172 is trooped. The fifth movement of the cam 119 closes the clutch 92, and thereby the shaft 9 of the lateraltensioning devices is actuated until the lever 172 is again tripped by means of the nut 205 and the lever 213. The final movement of the cam opens the clutch 92 and the switch of the motor, thus bringing the operation to a close. Specification 21,361/94 is referred to.