US1795799A - Stop motion for drawing frames - Google Patents

Description

March 10, 1931. w. J. SCOTT STOP MOTIION FORDRAWING FRAMES 2" Sheets-Sheet 1 Filed Nov. 30, 1929 mnnmmmm WMW m A TTORNEYS.

March 10, 193]. w, J, S T 1 1,795,799

STOP MOTION FOR DRAWING FRAMES Filed Nov. 50, 1929 2 Sheets-Sheet 2 VENTOR. fly Q z/a/y/ Snail/ 0 6M flank-w A TTO RNEYS slivers which pass thru the draft rolls, the i Patented Mar. 10, 1931 WALTER :r. scorn or wooivsooxn'r, :anonn ISLAND V I STOP MOTION FOR DRA ING FRAMES Application filed November 30, 1929. Serial No. 410,712.

This invention relates to an electric stop motion for machines for drawing textile fibres, such as drawing frames, gill boxes and the like, and is an improvement on my prior Patent No. 1,722,769, dated July 30, 1929; and an object of this invention is to provide a stop motion having an electric circuit closing unit located adjacent the line oftravel of the unit having a plurality of contact members, each arranged to be operated independently of the other by engagement with anyone of a plurality of broken slivers to affect the circuit and stop the machine.

,A further object of the invention is the provision of means for supporting these contact fingers in avertical position, whereby the fall of a broken sliver upon the contact finger will move the same to close the circuit and stop the machine. v The invention further consists in the constructing of a row of these vertically disposed contact fingers to. extend across the line of travel of the slivers, and arranging them in a plane below the normal line of travel of these slivers whereby when any one of the slivers is broken it will fall upon and engage one of the fingers and its weight together with the travel of the sliver will cause the fingers to move to complete the circuit and stop the machine.

With these and other objects in view, the invention'consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims. I

In the accompanying drawings: Figure 1 is a side elevation showing the general arrangement of portions of the usual mechanism for a drawing frame with my improved contact unit applied thereto and indicating one of the slivers as having been broken and lying upon one of the contact fingers and having moved that finger to complete the circuit and stop the machine.

Fig. 2 isa view showing an end view of the guide plate with aset of my improved contact fingers connectedto the frame of the machine adjacent this guide plate.

Fig. 3 is an enlarged edge view-partly in section showing the unit as bolted in position contact fingers.

at the base of the guide plate'and the relative positions of the contact bar and the flexible Fig. 4 is a section on line 4-4 of Fig. 2.' Fig. 5 is a section on line 55 of Fig. 2, showing one of the fingers in dotted lines as having been sprung forward to contact with the contact bar. I, I 1

Fig. 6 shows a strip of very thin tempered metal slit to form readilybendable contact fingers. Fig. 7 is a modification showing aside elevation of gill box construction with my improved stop motion unit applied thereto. 7 i

Fig. 8 is a sectionalview looking in the direction of. the arrow in Fig. 7 showing my improved stop motion. as attached to the frame of a gill box and its position relative to the rear draft rolls.. g

Flg. 9 is a diagrammatic view illustrating.

the wiring diagram in whichthe contact fingers are arranged toclose the circuit by the weight or action of a broken sliver to operate the belt-shifting lever. i

It is found in the practical operation of drawing frames, gill boxes and the like thru which textile fibres are drawn by a set' of drawing rolls that quite often one or more of these slivers are broken and when this occurs the remaining slivers which continue to run naturally form a thin place'in the yarn andthis' defective condition may be continued for some time before being discovered by the operator; and to obviate this dif-- ficulty, I have provided an automatically operable stop motion which consists of a plurality of readily'bendable fingers or ele-. I

ments arranged in a row to extend across the line of travel of the slivers, each finger being arranged to operate independently of the other so that when any one of these running slivers breaks and falls into contact with any one of these fingers, that finger will yield independently of the other under the weight and the forward drawing action of the sliver and bend forward into contact with another contactingelement to completethe electric circuit and stop the machine. improved circuit closer is herein shown as formed in a single unit which may be constructed complete independently of the machine and is adapted to be readily attached in working position to the machine and as readily removed for inspection and repairs; and the following is a detailed description of the present embodiment of my invention and showing one means by which these advantageous results may be accomplished:

lVith reference to the drawings, 10 designates a plurality of supply packages which may be spools, bobbins and the like on which slivers 11 are wound and from which these slivers are led thru the slots 12 in the guide plate 13, thence over and around the back draft rolls 14 thru the carrier rolls 15 and the front rolls 16 and after being drawn out or drafted, the yarn is fed thru the flyer 17 to be wound upon the spool or bobbin 18 which is raised and lowered on its spindle 21a thru action of the rack 19 and pinion 20, which spindle and spool is rapidly rotated by the whirl 21 thru the belt 22 and pulley 23. It is found in practice that the sliver ends often break down at some point between the supply package 10 and the guide plate 13, as illustrated in Fig. 1, at 24, and that when this occurs and the remaining sliverscontinue to run without breaking down, and without the broken sliver, a thin place in the yarn is nautrally formed and when later discovered necessitates cutting out and loss of the thin portion, and piecing up the broken ends and starting over again with the required number of ends. I

To obviate this difficulty, I have provided automatic means in the form of an electric stop motion which I attach to the machine, the same including a circuit closing unit which comprises a plate 25 of suitable length to which is attached a bracket 26 arranged to be attached by a bolt 27 to the guide plate 13,

see Fig. 3. Mounted on this plate 25 is a contact bar 28 preferably of carbon which is retained in the casing 29 to extend forward from the plate 25. A front plate 30 is supported from the back plate 25. by means of the depending arms 31 and the bolts 32.

In order to form a set of very flexible contact fingers I employ a strip 33. of'very thin tempered steel, the same being split as at 34 along one edge to provide a plurality of spaced contact fingers 35 and this strip of metal is. secured to this front bar 30 by means of bolts 36 with the free ends of the fingers of the strip extending upwardly and extending in a row across the line of travel of the slivers as they run thru the guide plate 13. By means of the bolts 32 and binding nuts 37 thereon, this plate with its contact fingersmay be adjusted laterally relative to the contact bar 28, so that the proper distance between the contact bar and these fingers may be readily obtained.

In order to protect the free ends of these r delicate fingers from being inadvertently engaged and moved to close the circuit, I have positioned a guard plate 38 which is supported on the rods 39 and bound in position thereon by means of binding nuts 40, Whereby these fingers normally rest back against this guard plate and are permitted to be engaged by the falling of a broken sliver, the weight of which is sufiicient to bend these delicate fingers forward into contact with the contact bar 28 to close the circuit and stop the machine. y

In additionto the weight of this broken sliver in falling upon the contact fingers, the continued forward feeding movement of this broken sliver also'assists in bending these fingers forward into engagement by the contact bar to complete the electric circuit.

My improved stop motion unit may be applied to any sliver feeding and drawing machine and in Figs. 7 and 8 is illustrated as being applied to a gill box,in which case the unit 41 is shown as being located in front of the rear draft rolls 42 of the gill box and as illustrated in Fig. 8 these spaced fingers extend the full length ofthe rolls across the machine. 7 r I As above described, this set of flexible bendable fingers is supported in the plate 24 and is insulated therefrom by the fibre washers 43, as shown" in Fig. 5, and is conend falls and rests upon one of these very thin flexible fingers 35, a row of which extends across'the path of the running slivers,

whereby the weight of the sliver causes the finger'engaged tospring forwardly into contact with the carbon rod 28, thus completing the. circuit to energize the electromagnet 46,

trip the latch 47 and release the lever 48,

which thru the action of spring 49 throws the 4110 rod 50 and shifts the belt from thetight pulley 51 to the loose pulley 52' thus stopping the machine. The electric circuit is herein shown as being normally openbutto so arrange the finger 35 that its movementv will open the circuit instead of closing it, will fall within the spirit and scope of this invention. V 7

My improved stop motion for drawing frames is extremely simple and practical in its construction and operation and by its use much time is saved andwaste of good textile material is prevented for by its use the moment a sliver is broken the machine is stopped which immediately gives notice to the operator who then pieces up the ends and after the trouble is. corrected the machine is started again.

I claim:

1. In a machine for drawing textile fibres,

a set of sliver supply packages, a set of draft rolls, an electric circuit, a stop motion in said circuit, andcircuit closing means positioned contact bar, said sheet being connected in said circuit, whereby movement of any finger in response to engagement of a broken sliver will complete the circuit and stop the machine, a I

2. In a machine for drawing textile fibres, a set of sliver supply packages, a set of draft rolls, an electric circuit, a stop motion in said circuit, and circuit closing means positioned beneath the line of travel of the slivers including a contact bar, a sheet of resilient material having spaced slots providing separate flexible contact fingers adapted to be independently moved into engagement with said contact bar, and a support bar against which said fingers normally rest, said sheet being connected in said circuit, whereby movement of any finger in response to engagement of a broken sliver will complete the circuit and stop the machine.

3. In a machine for drawing textile fibres, a set of sliver supply packages, a set of draft I rolls, an electric circuit, a stop motion in said circuit, and circuit closing means positioned beneaththe line of travel of the slivers including a contact bar, a sheet having separate flexible contact fingers each adapted to r be independently moved into engagement with said contact bar, said sheet being'coir nected'in said circuit, whereby movement of any finger in response to engagement of a broken sliver will complete the circuit and stop the machine. v

4. In a machine for drawing textile fibres, a set of sliver supply packages, a set of draft rolls, an electric circuit, a stop motion in said circuit, and circuit closing means positioned beneath the line of travel of the slivers including a contactbar, a sheet having separate flexible contact fingers each adapted to be independently moved into engagement with said contact bar, and a support bar against which said fingers normally rest, said sheet being connected in said circuit, whereby movement of any finger in response to engagement of a broken sliver will complete the circuit and stop the machine. In testimony whereof I affix my signature.

WALTER J. SCOTT.

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