Patent GB-400194-A (GB)
Title: Improvements in automatic shuttle-changing mechanism for looms with several shuttles
IPC: D03D45/34
Filed: 1932-01-14
Abstract: 400,194. Looms with automatic weft-replenishing mechanism. PONCET, A., Champier, Isere, France. Jan. 14, 1932, No. 1175. Convention date, Jan. 14, 1931. [Classes 142 (i) and 142 (iii).] In looms provided with two or more shuttle magazines and employing a corresponding number of shuttles, an exhausted shuttle is replaced by one from the appropriate stock by means of shuttle changing mechanism which is set in operation during a temporary stoppage of the normal weaving operations. The appropriate shuttle is selected by means of a device which co-operates with the weft feeler mechanism and the change-box motion, indication of weft exhaustion serving to move a double clutch from loom driving position into engagement with means for operating the shuttle-changing mechanism. Driving arrangements. The loom proper and the shuttle-changing mechanism are driven by means of a constantly rotating pulley 5, Fig. 4, forming part of double friction clutch which can be moved axially on the loom shaft 1 to bring a plate 2 into engagement with a brake pulley 9 to drive the loom or to bring a plate 4 into engagement with a plate 11 to operate the transfer mechanism. Associated with the pulley 9 is a gear wheel 10 which drives the picking shaft 22 and the latter is provided with a disc 23 having a notch to receive a tooth 34a on a double-armed lever 34-35 pivoted on the loom frame. Weft feeler arrangements. A weft feeler T, Figs. 1 and 7, provided at the side of the loom remote from the change boxes, is lowered at intervals into contact with the cop C and on weft exhaustion a horizontal nose t thereon engages a lever 104 and rocks a shaft 103. Delaying stoppage and shuttle changing. Rocking of the shaft 103 causes a lever 105 to engage and displace one of two selectors A, B, Figs. 7 and 9, slidably mounted in a carriage 58, which is reciprocated on a plate 59 by connections from the change box mechanism, thereby bringing a hole a or b, Fig. 9, into alignment with holes 58b or 58c and 59b and presenting an opening to the end of a vertical rod 38 carried by the lever 35. Since the notch on the disc 23 only co-operates with the tooth 34a when the shuttle is on the change box side of the loom no displacement of the rod 38 takes place and consequently stoppage and shuttlechanging are delayed until the exhausted shuttle makes two more picks. Stop motion arrangements ; initiating shuttle change. When the shuttle corresponding say to selector A returns from the change boxes, the tooth 34a drops into the notch on cam 23 under the influence of a spring 42 and the resulting angular movement of the lever 34-35 causes the rod 38 to be projected through holes 59b, a, 58b. At the same time an arcuate portion 40 of the lever 34 engages a cam 47 and rocks a shaft 43 thereby causing a cam 45, Fig. 4, to rock a double-armed lever 29-30 and move the clutch through links 28, 27, 25, into engagement with the disc 11. The clockwise movement of the shaft 43 also effects the withdrawal of a lever 49 from a notch 19a in a cam 19, causes a cam 51 to be withdrawn from the end of a spring controlled brake lever 53, and moves the curved end of a lever 86 towards a pin 79 on a shuttle transporting member 78. Shuttle-changing mechanism. When the disc 11 is engaged by the clutch plate 4, a shaft 18, Fig. 4, mounted coaxially with the shaft 22, is rotated and cams 19, 20 thereon effect the various operations of shuttle-changing. By the action of the cam 20 on a follower lever 89, a shaft 91 is rocked and the front wall of the shuttle box raised by means of connections 90, 92, 93, the latter movement tilting a pair of double-armed pivoted levers 97-98 to eject the exhausted shuttle. A second lever 90a on the shaft 91 rocks a pivoted lever 118 and raises a vertical rod 120, positioned alongside the shuttle carrier 78, so as to effect release of a shuttle from one of the magazines 101 or 102. With the continued rotation of the shaft 18, the cam 19 engages the lever 49 and imparts an additional clockwise movement to the shaft 43 thereby causing the hooked end of the lever 86 to engage the pin 79 and move the member 78 with the released shuttle in a carrier plate 100 towards the shuttle box, the shape of the cam 20 being such as to permit lowering of the box front prior to withdrawal of the carrier plate. When the peak of the cam 19 is under the lever 49, a cam 48 on the shaft 43 raises the lever 34-35 to normal position and effects withdrawal of the rod 38, a collar 111 on the latter causing a lever 110 to reposition the selectors. After one revolution of the cam 19 the lever 49 again drops into the notch 19a and the accompanying anticlockwise movement of the shaft 43 removes the brake and allows the clutch to re-engage the brake pulley 9 under the action of the spring 8. Magazine arrangements. Each of the shuttle stocks 101, 102 is provided with shuttle-retaining members in the form of notched rollers 137, Fig. 5, which are rocked by a finger 121 on the rod 120 engaging a finger 130, the circular portion of the rollers being turned into the magazine to retain the penultimate shuttle when the lowermost shuttle is being released. The shuttlereceiving plate 100 is positioned below the appropriate magazine by connections from the change-box motion, a shaft 67 extending therefrom being connected by links 68, 72, 71 to a slotted lever 74 which co-operates with a pin 76 on the member 78 to move the latter to the correct shuttle-receiving position. A second lever 66, connected to the shaft 67, produces a corresponding rocking movement in a vertical shaft 62 to operate the carriage 58 and present the appropriate selector to the weft feeler. Specification 357,161 is referred to.