US2245013A - Loom for weaving - Google Patents

Description

June 10,1941 Q sHlMWELL ETAL I 2,245,013

' LOOM FOR WEAVING Filed Jan. 29, 1940 2 Sheets-Sheet 1 Patented June 10, 1941 UNITED STATES PATENT OFFICE" 2,245,013 I LooM FOR WEAVING Shiplake-on-Thames, England, assignors of one-third to Colin Cooper, Birkdale, Southport,

England 8 Claims.

This invention relates to looms of the type in which the shuttle boxes are mounted for independent movement with relation to the slay and reed, the latter with the shuttle boxes moving together towards the beat-up position during the time the shuttle is travelling through the warp shed, whilst as soon as the shuttle passes into a shuttle box, the shuttle boxes slow down and the slay and reed speed up to effect beating-up. The said type is described and claimed in the specification of our prior Patent No. 2,159,865.

In accordance with our present invention, we so time or dispose the cam, eccentric, or other mechanism by which the shuttle boxes, slay and reed, and shuttle are operated, that when the slay is moving backwards from the beat-up position the reed and slay go past the exact alignment of the shuttle box'backs until the reed becomes positioned slightly in the rear of that alignment so that when the shuttle leaves a shuttle box the reed is behind the line of shuttle box backs, and thus'there is no possibility of the flight of the shuttle being impeded by striking the reed, and when the slay and reed are moving forwards towards the position at which the shuttle leaves the reed space to enter a shuttle box, the reed goes past the exact alignment of the shuttle box backs until the reed becomes slightly in advance of that alignment, so that when the shuttle enters the shuttle box the shuttle is not liable to be diverted by striking the shuttle box back before it is well boxed.

A further feature of the invention is that whilst the shuttle boxes are moved back and forth by very short crank arms, which gives the shuttle boxes a long dwell at about back centre, the slay and reed are reciprocated by cams which give to the slay and reed an equal'long dwell at about back centre followed by a continuous acceleration up to a maximum with a continuous deceleration until front dead centre is reached on the outward or beat-up stroke and likewise a continuous acceleration followed by a continuous deceleration and along dwell at about back centre on the return stroke;

Referring to the accompanying sheets of explanatory drawings- Figures 1 and 2 illustrate diagrammatically the relative position of the reed and shuttle boxes when the shuttle is passing from the reed space into a shuttle box and when it is passing from a shuttle box into a reed space respectively.

Figure 3 is a plan view of the shuttle box and reed and slay operating'mechanism at one side of the loom, and,

Figure 4 is an elevation showing the shuttle box and reed and slay operating mechanism.

Figure 5 shows the knock off mechanism in action and its effect on the reed and slay operating mechanism.

In Figure 1 the shuttle a is shown passing from the reed space into the shuttle boxb, and it will be seen that the reed c is slightly in advance of the rear wall b of the shuttle box.

In Figure 2 the shuttle a, is shown leaving the shuttle box 1) and entering the reed space. In this case the rear wall 0 of the shuttle box is slightly in advance of the reed c.

The distance d between the two arrow heads in each of Figures 1 and 2 indicates the relatively advanced position of one part with regard to the other.

For convenience, the shuttle has beenshown entering and leaving the same box.

To obtain the relative positions shown in Figures land 2 at front and back dead centre, the strokes or amplitudes of movements of the shuttle boxes are slightly less than the strokes or amplitudes of movement of the reed and slay.

The shuttle box operating mechanism comprises cranks e, one at each side of the loom, each connected to an extension bracket 1 on the sword g by a connecting rod h. The shuttle boxes bare connected together by a part 12 extending across the loom below and clear of the slay.

The shaft 1 having the cranks e therein has cams 7' thereon which serve to move the slay 7c and reed 0 back and forth. Each cam. 7' has outer and inner tracks 7' and i which are engaged by rollers 12 and 11 upon a pin 0 projecting laterally from the lever q pivoted at one end r to a side member of the loom frame. At the other end the lever q is connected to one of two links s, t interconnected at u, the link t being connected to the slay and reed carrying bracket 22. The link shas -a lever w attached to it and such lever to is connected to a further lever :12 pivoted to the sword 1/ which has the bracket o thereon to support the slay and reed. The sword y is pivoted to the shuttle box sword g. There is a lug e on the-lever x which can be engaged by an arm 2 upon a rod 3 which is turned by the shuttle box swell in a manner well known in the art. There is a further arm 4 upon the rod 3 which is adapted to engage the catch 5'when the rod is suitably turned as shown in Figure 5. When so turned, the arm 2 engages the lug e and raises the lever systemx, w so as'to move the links s and t out of alignment. The movement imparted by the cam a to the lever q is not then transmitted to the sword y and the slay and reed but is merely expended in pushing the links 3, t (which act as toggle links) more or less out of alignment. The spring 6 tends always to return the links s, t J a position in line with one another.

The brackets v are shaped to provide a clearance space behind the reed so that a shuttle in the shuttle box can be moving towards the reed before the reed is in position toallow the shuttle to enter the reed space without its point or nose fouling the bracket as it passes the shuttle box, seeing that the bracket is well in advance of the reed. Conversely the rear end of a shuttle entering its box will not foul the bracket for a similar reason.

The cam tracks in the cam j .provide for a gradual acceleration of the rate of travel of the lever q and a gradual deceleration between end periods during which the lever is held comparatively stationary. The are of this comparatively stationary part of the loom cycle at about back dead centre is very important as it determines the part of such cycle which can be occupied by the shuttle in travelling through the shed or reed space. The highest speed of the slay and. the shuttle boxes is generally at a point about 115 to 120 after back centre and this is the point at which the slay parts company with the shuttle boxes.

If the shuttle boxes have a movement which is about one-half to two-thirds of the movement (about '5 to '7 inches) usual in ordinary looms, and

' our improved arrangement of rearwardly projecting arms on the swords and short connecting rods and crank arms be employed for theirmcvement, then the shuttle boxes move during from 110 to 120 of the loom cycle'o-nly about inch before and /2 inch past back centre. This gives a long time factor for the shuttle flight (that is about .235 to- 240 of the 360 cycle). The shuttle can enter the'warp shed as soon as the reed joins the boxes that is at 60 to 65 after beat up and. can leave the shed 65 to 66 before beat up.

It will have been noted that when the lever arm 2 pushes the toggle links out of line, there is a shorteningiof the distance between the lever q and the bracket 11. This results in the bracket being drawn backwards relatively to its normal position with the toggle links in line so that if a shuttle be trapped in the reed space, the reed is maintained at 'or behind the line of the "shuttle 'boxes'and therefore the liability of damage to the warps by the trapped shuttle is minimised.

We claim: v 1. A loom for Weaving of the type specified. comprising means to move the shuttle boxes and means to move the slay, the said means being arranged and interconnected to move said shuttle boxes and'slay in such manner that when the slay is moving backwards from the beat-up position, the reed goes past the line of the shuttle box badks and becomes positioned slightly to the rear of such line'and whenthe'slay and reed are moving forwards towards the position at which the shuttle leaves the reed space to enter a shuttle box, the reed goes past the line :of fthe shuttle box 'backs until the reed becomes posi- 2. Aloom as claimed in claim 1 wherein the means to move the shuttle boxes comprise at least one rotary crank and 'the means to move the slay comprise a cam mechanism having a cam of such contour as to give'a long dwell 'fto the slay and reed at about back centre, a gradual acceleration and a gradual deceleration to front centre, and a gradual acceleration with a gradual deceleration towards back centre.

3. A loom as claimed in claim 1 wherein the means to move the slay include a cam and a toggle link connection from said cam to said slay, together with a shuttle box swell and means actuated by said shuttle box swell to collapse said toggle link connection and to draw said slay backwards positively if the shuttle fails to be properly boxed. 7

4. The loom claimed in claim 1 wherein there is a backwardly curving bracket on the rear face of the slay at each end thereof, to which brackets the means to move the slay are pivotally secured.

5. Aloom for weaving comprising two shuttle boxes, a slay movable independently of said shuttle boxes, a reed upon said slay, swords carrying said shuttle boxes, swords carrying said slay pivoted to said shuttle Ibox carrying swords, at 'least one rotary crank, a connection from said crank to said shuttle box. carrying swords, a r0- tary cam, a cam :follow'er associated therewith and a connection from said cam follower to said slay carrying swords, the contour of said'camfbeing such that when .the slay is moving backwards 'from'the 'beat-upposition, the reed goes past the line of the shuttle box backs and becomes positioned slightlyto the rear of such line and when the slay and reed are moving forwards towards the position at which the shuttle leaves the reed space to enter a shuttle box, the reed goes past the line of .the shuttle box backs until the reed becomes positioned slightly in advance of such line.

'6. A loom -for weaving comprising two shiit'tle boxes, a slay movable independently of said shuttle boxes, a reed upon said slay, swords carrying said shuttle boxes-swords carrying said slaypiv oted to said-shuttle box carrying swords, at least one rotary crank, a connection from said-crank to said shuttle box carrying swords, a rotarycam, a cam follower associated therewith and aconnection from said cam follower to said slay carrying swords, the contour of said cam being such that when the slay is moving backwards from the beat-up position, the reed goes past the line of the shuttle box backs and becomes'positi'oned slightly 'to the rear of such line an'dtwhen the slay and reed are moving forwards; towards the position at which the shuttle leaves the reed space to enter a. shuttle box, the reedgoes past the line of the shuttle box backs until the reed becomes positioned slightly'in advance of such line and such as to impart a long dwell to the slayand reed at about back centre, a gradual accoloration and a gradual deceleration to front centregand a gradual acceleration with a gradual deceleration towards back centre. 1

7. A loom as'claimed in claim '5 wherein the connection from the cam to the slay carrying swords comprises a toggle linkage, togetherwith a shuttlebox swell, and means actuated by said shuttle box swell to collapse said togglelinkage and to draw said slay backwardspositivelyif the shuttle fails to be properly boxed.

8. The loom claimed in claim 5 wherein there A is'a backwardly curving bracket on therear face "of the slay at each end thereof, to which brackets the connection "from thecam is pivot ally secured.

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