US2836202A - Pirn changing device - Google Patents

Description

1953 s. WIGET EI'AL- 2,836,202

PIRN cmmcmc navzcz Fill-0d Sept. 2, 1955 2 Sheets-Sheet 1 IN VE N TORS GEORG WIGET YGLLSI'PM DUBS Mun-w. My

May 27, 1958 G. WIGET EIAL PIRN CHANGING DEVICE 2 Sheets-Sheet 2 Filed Sept. 2. 1955 IN VE N TORS EEORG NIGE'T GUSTAV D05 Arry I 2,836,202 Patented May 27, 1958 PIRN CHANGING DEVICE Georg Wiget and Gustav Dubs, Arbon, Switzerland, as-

signors to Societe Anonyme Adolphe Snorer, Arhon, Switzerland Application September 2, 1955, Serial No. 532,221

Claims priority, application Switzerland October 6, 1954 Claims. (Cl. 139-232) This invention relates to looms, and more particularly to looms of the automatic changer type.

Pirn change devices are known where the loom is provided with a magazine comprising a number of compartments disposed side by side, each of which is designed to accommodate a distinct series of pirns; these various series are distinguished from one another by the color and/ or fiber characteristics of their threads. With known changers of this kind, the full pirn selected by the agency of the pirn feeler on the loom, drops by gravity from the magazine into the transfer position to be transferred to the shuttle by the hammer, the pirn to be replaced being thrown out simultaneously. Devices of this type suffer from the serious drawback that quite frequently, the drop of the exchange pirn is delayed by jamming; moreover, it is by no means an uncommon experience with devices of this kind that the pirn, once it has arrived in the transfer position, does not budge from this position if for some reason, an orderly transfer does not take place.

It is a primary object of this invention to eliminate these drawbacks, and to provide automatic pirn changers insuring an undisturbed performance of the loom.

Other objects, and the manner in which the same are attained, will become apparent as this specification proceeds.

The invention contemplates providing a loom with a pirn changer wherein each compartment of the magazine has coordinated with it, a movable pirn guard which in its normal position, is designed to intercept the pirn resting at the bottom of the pile in the compartment, and where for purposes of every pirn change operation, the respective pirn guard is moved automatically into a transfer position, common to all the guards, located above the shuttle which is to receive the pirn.

A preferred embodiment of the invention provides pirn guards of oblong configuration one end of which is hinged to a support common to all the guards, while their other ends are mounted for displacement controlled by curved guides which cause the pirn guards moving from intercepting to transfer position, to follow a path extending downward and sideways.

Advantageously, the pirn guards are flexibly connected with slides the displacement of which is controlled by the curved guides, and these guides are all arranged in one and the same shield.

In the drawings affixed to this specification and forming part thereof, a preferred embodiment of the invention is illustrated diagrammatically by way of example.

In the drawings:

Fig. 1 is a side elevation, partly in section, of a device according to the invention;

Fig. 2 shows two horizontal sections taken along lines II (upper half of Fig. 2) and II-II (lower half of Fig. 2) in Fig. 1; M

Fig. 3 is an end'view looking at the device of Fig. l

from the left, and incorporating auxiliary mechanism, and

Fig. 4 is a vertical section (on a larger scale) taken along line III-III in Fig. 1.

Referring to the drawings wherein like elements are denoted by identical reference numerals and characters, and first to Fig. 1, the magazine 1 which in horizontal section, has the configuration of a circular sector (Fig. 2), comprises two peripheral walls 2 and 3 and provided in these walls, four sets of radially opposed grooves 4 and 5 which subdivide the magazine into four parallel compartments A, B, C'and D (Fig. 4). Each of the compartments A, B, C, D is designed to accommodate a series of pirns E. Facing the larger peripheral wall, 2, of the magazine 1 is a head plate 6 which is provided with four curved guide slots 7, S, 9 and 10 (Figs. 2, 3) which are correlated with the four compartments A, B, C and D of magazine 1, and which extend downward and toward the vertical central plane of head plate 6. Each of the curved guide slots 7, 3, h and it mounts for vertical displacement, an oblong slide 11 which has pins 12 and 13 engaging the slot; the upper pins 13 are attached to a draw spring 14 which aims at keeping the respective slides 11 in their upper, rest positions.

Below each compartment A, B, C and D, there is arranged a pirn guard 15 the horizontal section of which, over the length of the compartment, corresponds to the rectangular section of the compartment, but which is elongated to extend way beyond the confines of the magazine, by means of longitudinal arms which, as shown in Fig. 2, converge to be hinged, side by side with the other guard ends, by a bolt 16, a connecting piece 17 and a common bearing bolt 18 disposed at right angles to the bolts 16, i. e. an arrangement in the nature of a universal joint, to a fixed mount 19. At their opposite ends the pirn guards 15 are provided with pins 15' the ball-shaped heads of which engage cylindrical openings 11 disposed in the slides 11, thus establishing ball-andsocket joints connecting the pirn guards 15 with the slides 1.1. The pirn guards 15, the plan view of which (Fig. 2) shows oblong frames closed upon themselves, mount, on each of their side arms, a leaf-type clamping spring 29 (Fig. 4) to serve as an elastic bottom closure. The

\ top of the mount 19 carries a series of pegs 21 forming a comb designed to accommodate in spaced relationship,

' the free ends of the threads e emanating from the pirns E.

Referring in particular to Fig. 3, a guide rod 22 is connected with a pirn feeler device (not shown) provided for the shuttles. The guide rod 22 controls a bell crank lever 23 which is pivotally supported on a fixed bolt 24 to assist in controlling a pushing rod25 pivoted to the upper arm of the bell crank lever 23. The pushing rod 25 is also connected, by a guide rod 26, with the upper arm of a bell crank lever 27 which is pivotally supported on a fixed bolt 28 and the second arm of which is connected with a control rod 29 whose movements are governed by the control for the vertical displacement of the shuttle box (drop box).

in Figs. 3 and 4, 3t! denotes the hammer provided to eject the exchange pirns E; the hammer is controlled by the pirn feeler device in a manner known in the art. The hammer 39 is pivotally mounted on a fixed bolt 31. F denotes a shuttle, and G an empty pirn still in the shuttle but about to be replaced by a full replacement pirn. At the bottom of each compartment A, B, C and D of the magazine 1, a shaft 32 pivotally supports a twoarmed stop pawl 33 which is influenced by a draw spring 34. This spring tends to keep the pawl 33 in a position where its longer arm extends into the path of any pirn emergingfrom the respective compartment, for the purpose of preventing the bottom pirn E from issuing from the compartment prematurely.

. The above described preferred embodiment of the invention operates in the following manner:

Supposing a weaving operation uses a pirn-E deriving from compartment D (Fig. 4), and the control rod 29 is in its lowermost position which it'assunied in'the' course of the preceding transfer operation, where the twoarmsof the hell crank lever 27 take up the positions marked IV in Fig. 3. If, for example, weaving is to proceed with a pirn E of the series stored incompartment A, the pirn change is initiated in such a manner that the changeraggregate causes the respective shuttle box to move into that position where the shuttle shed is in trans fer position with respect to the corresponding pirn. At the same time, the control rod 29 is automatically displaced upward until the bell crank lever 27 assumes the position indicated by I, I in Figf 3fwhereoy the pushing rod 25 controlled by the guide rod 26, is in its turn moved into its I, I position. a a When the supply of thread on the working pirn is exhansted, thefeeler device initiatesthe exchangerof pirns 'bycausing the guide rod 22 'to displace the bell crank lever 23 clockwise. The pushing rod 25 linked to the bell crank lever 23 pushes the slide 11 correlated with compartment A, downward on shield 6,- counteracting will be apparent to any person skilledin the art which would not depart from the spirit of 'the invention nor the influence of spring 14 on the pin 13, with the result that the bottom pirn E in compartment A is moved into the transfer position, i. e. first is moved into the corresponding pirn guard 15 which in turn moves the inter- 'cepted pirn E, by a downward (Fig. l) and sideways (Fig. 3) displacement from intercepting to releasing position, just above the shuttle F intended to receive the new pirn (Figs. 3, 4). The full pirn E is now in proper 'position for being transferred by means of the hammer 30, into the shuttle F whereupon the hammer 30 returns to the initial, rest position. At the same time, the feeler device moves theguide rod 22 (to the right in Fig. 3), causing the bell crank lever 23 to be displaced counterclockwise so that the pushing ,rod 25' too returns into its initial position (Fig. 3). Spring 14 is now free to return slide 11 whereby also the corresponding pirn guard 15 is brought back into its normal position 'where it stays just below the respective compartment of the pirn magazine until it is displaced again in a subsequent pirn change operation.

The pirn changer of the invention has a number of sacrifice any advantages thereof.

We claim: 1. A pirnchanger for use in looms number of distinct pirn guards each correlated with one of said compartments and normally disposed there-below whereby to be in a state of preparedness to intercept 'a pirn from the respectivecompartment, andrmeans for cepting to. thecommon transfer position along a downward and sidewayspath. v

3; A pirn changer according to claim 2, wherein the pirn guards comprise a substantially rectangular, pirn accommodating portion, and gradually narrowing exten- 'sions, said extensions converging toward the universal mount common to all the pirnguards. y

4. A pirn changer according to claim 2" wherein the. other ends of the pirn guards are universally mounted in slidesysaid slides being mounted for displacement along the curved guides, and ahead plate is provided on whichthecurved guides are disposed.

5. A pirn changer comprising,.in combination with a mold-compartment pirn storage magazine and a shuttle to which pirnsfrom said magazine are to be transferred,

a number of distinct, separately displaceable 'pirn guards each correlated ,with'one. of said compartments and normally disposed there-below, whereby to bein a state of preparedness to intercept a pirn from saidcompartment,

saidpirn guards including pirn accommodating portions and extensions, a common universal mount for all the said extensions, a head plate'at the other end of said pirn guards, curved guides disposed on said head plate, slides mounted for displacement in said curved guides and, 7 universal mounts for supporting 'the end of each pirn.

guard in proximity to the pirn accommodation portion, in one of said slides, whereby *to displace only the .pirn

guard actively engaged in a pirn change, along adownward and sideways. path, from transfer position.

References Citerl in the iile of this patent UNITED STATES PATENTS i 1,032,463 Wy'man July 16, 1912 and the like for transferring from a multi-cqmpartment magazine store. ing various'series of pirns, a pirn from any one of the compartments to a shuttle, comprising in combination, a

the intercepting to' the

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