US3113737A

US3113737A - Pneumatic traverse device

Info

Publication number: US3113737A
Application number: US202004A
Authority: US
Inventors: Paul D Emerson
Original assignee: Monsanto Chemicals Ltd
Current assignee: Monsanto Chemicals Ltd; Monsanto Chemical Co
Priority date: 1962-06-12
Filing date: 1962-06-12
Publication date: 1963-12-10
Anticipated expiration: 1980-12-10
Also published as: CH398402A; DK103657C; GB983032A

Description

Dec. 10, 1963 P. D.KEMERsoN PNEUMATIC TRAVERSE DEVICE Filed June 12, 19612.A

Xml/Lg m. TWE- ATTORNEY United States Patent 3,]L3,737 PNEUMATHC 'EFAVERSE DEVEQE Paul D. Emerson, Pensacola, Fla., assigner to Monsanto Chemical Company, St. Louis, llt/lo., a corporation of Delaware 'Filed .lune l2, i962, Ser. No. 292,904 6 Claims. (Cl. 242-43) This invention relates to pneumatic traverse devices of the Itype used in the textile industry to displace yarn reciprocally across the face of a bobbin in yarn winding processes. More particularly, the invention relates to e. high speed pneumatic traverse device employing resilient means to reduce impact stresses and to effect uniform winding of yarn on a bobbin.

Traverse devices used in the textile industry, particularly in such as nylon filament yarn winding operations, to displace yarn reversibly on a bobbin are constantly being improved to achieve higher operational Speeds. There is a need in the textile industry for high speed traverse devices to operate improved high speed textile processes as, for example, present continuous yarn spindraw processes.

One kind of traverse mechanism used in the textile industry is of the pneumatic type. The conventional pneumatic type, in general, utilizes compressed air to shuttle a guide-carrying piston back and forth in a tube. Reversal of the piston at the end of each stroke is negotiated by operatively and iluidly connecting the piston to the force of compressed air by valve means. These conventional pneumatic traverse devices have disadvantages.

One disadvantage is that they operate in the range of i400 to 1600 cycles per minute, which is too low a range for present textile processes. Current processes require traverse devices which are adapted to operate in the range of 3000 to 4G00 cycles or 60G() to 8G00 strokes per minute.

Another disadvantage is that the valve and piston components comprising these devices are made of non-resilient or rigid materials. When lcontact is made between these components, they are sub-ject to vibration and a so-called undesirable bounce-back effect. To dampen bounceback tendencies, it is necessary to incorporate special dampening or cushioning means to absorb the impact stresses generated.

Another 4disadvantage of conventional pneumatic traverse devices is that more than one component must be actuated by a piston in order that flow of compressed lair be controlled. This type of arrangement leads to time delays at the end of each stroke of the reciprocal piston.

`Other shortcomings exist in the manner of uncovering valve seats. In the conventional valve constructions,

ValVe Seals ae UUCOVefed by PYOgfeSSVelY increased de M rel l. having a 'valve assemblage mounted :at each end grees so that the full force of the compressed air is not immediately applied to the piston. The consequent delay yields nonuniformly wound yarn packages characterized by the packages having bulges at the ends.

llj? Patented Dec. l0, 1963 A still further object is to provide a high speed pneumatic traverse device which is simple in operation and construction and inexpensive to manufacture.

In general, the high speed pneumatic traverse device embodying the invention comprises a piston slidably reciprocable in an elongate bore in a casing. The bore is open to the exterior of the casing through a longitudinal slit formed therein. A guide, adapted to carry a yarn exteriorly of the casing and to be operable in the longitudinal slit, is secured to said piston and projects through the slit.

The piston and the guide operatively attached thereto are reversibly actuated Iby compressed air for traversing yarn back and forth across the face of a rotating bobbin. The compressed air flows -against the piston and propels it reversibly through said bore when the piston alternately strikes expansible diaphragms clamped in the casing at each end of the bore. The impact of fthe piston with each diaphragm unseats it from its normal seated position on a valve seat formed in the casing. The alternate unseating of the expansible diaphragms from their corresponding valve seats permits compressed air from fluid pressure delivery chambers, defined in the casing at one side of said expansible diaphragms and normally supplied with compressed air to flow into the elongate bore past the valve seats and thus into Contact with the piston. The fluid pressure delivery chambers are constantly in communication with corresponding iluid pressure supply chambers via perforations formed therein while the fluid pressure supply chambers are normally charged with compressed iair from a suitable source of supply thereof. The compressed air exhausts through the longitudinal slit in the casing.

The drawing and the detailed :description which follows provide a more comprehensive understanding of the structure and operation of the invention.

ln the accompanying drawing:

FGURE l is a cross-sectional view showing the novel pneumatic traverse device connected to a source of compressed lair;

FIGURE 2 is an elevation View showing the novel high speed pneumatic traverse device, on a smaller scale and with portions cut away, in association with a yarn take-up evice; and i HGURE 3 is a plan view showing a preferred construction of the resilient means incorporated lin the novel high lt is an object of this invention to provide a high speed pneumatic traverse device utilizing perforated resilient means to eect reciprocal displacement of a piston by compressed air and to minimize impact stresses encountered during operation.

Another object is to provide a high speed pneumatic traverse device which does not require special dampening means `to reduce so-called bounce-back effect.

Another object is to provide a high speed pneumatic traverse device adapted to traverse yarn at a speed of approximately 6000 strokes per minute.

A further object is to provide a high speed pneumatic traverse device adapted to effect an instantaneous high volume flow of compressed air past a valve seat to reciprocally move a free traveling piston.

speed pneumatic traverse device.

Referring to the drawing, like components in each of the figures are designated by like reference numerals for convenience reasons. The novel pneumatic traverse device, as shown in FlGS. l and 2, comprises a tube or barthereof. Each valve assemblage includes a hollow casing 2. formed of sectioned members providing a cavity therein.

Tube 1 has an elongate bore 3 therethrough `and a longitudinal exhaust slit 4 extending through the wall thereof. Slit 4 opens bore 3 to atmosphere. A piston 5, having a guide 6 iixedly secured thereto, is disposed within bore 3 and is slidably reciprocal therein. Guide `6 projects outwardly of tube 1 through longitudinal slit 4 and has a yarn carrying slot 7 formed therein.

Each hollow casing 2 has `a bore S. Bore 8 is aligned with and open at one end thereof :to bore 3 and open at `its opposite end to the cavity in its corresponding casing 2. The sectioned members of each casing 2 are clamped together by bolts 9. An annular valve seat 10, arranged coaxially with bore 8, is formed in each hollow casing 2 at said opposite end of each bore 8.

A circular resilient diaphragm 1l, preferably a nylon reinforced neoprene rubber diaphragm, is clamped at its outer periphery between respective sections of each hollow a casing 2 so as to extend transversely therethrough. Each diaphragm lll has a plurality of spaced pertorations l2 formed therein and has a duid pressure supply chamber 13 `deiined at one side thereof. At the opposite side of each diaphragm il .there is an annular uid pressure delivery chamber 14 defined within the respective hollow casing 2. Each annular fluid pressure delivery chamber 14 surrounds an annular valve seat l0.

The liuid pressure supply chambers 13 are each charged with iluid under pressure through a threaded port l5 extending through the wall of a respective hollow casing 2. Each port l5 is adapted to be connected rto a source of fluid under pressure via a line i6 normally charged with compressed air. A valve i7, -a pressure regulator 18, and a pressure gauge 19 are interposed in line le to control the flow of compressed air to the iiuid pressure supply chambers i3 at a predetermined value.

Normally, each diaphragm il is positioned in its corresponding sectioned casing 2 so as to be biased into seated engagement against its respective valve seat it? by the force of compressed air in the supply chamber i3 acting thereagainst at one side thereof, while at the opposite side thereof the area of each diaphragm lll that covers its corresponding valve seat iti is open to the ambient atmosphere via the longitudinal exhaust slit 4. Each diaphragm lll is coaxially arranged with its corresponding valve seat it?.

The iiuid pressure supply chambers i3 are always open to their corresponding delivery chambers ld through the per'forations l2 in the diaphragms ll. The perforations lf2 are preferably arranged in each respective diaphragm il so that they surround a respective valve seat lt).

Piston 5 is normally lubricated by a lubricating medium supplied to the bore 3 through an opening 2@ provided in the wall of tube l. Opening 26 is connected to a line 2l supplied with a lubricant.

Prior to operation, a yarn 22 from a source of supply is positioned in slot '7 in the yarn guide 6 and is laced therefrom to a bobbin 23 of a yarn take-up device 24. The fluid pressure supply chambers i3 are supplied with compressed air from line le for biasing the respective resilient diaphragms or valves 1l into seated position against their respective valve seats 1t).

In operation, piston 5 of the traverse device is manually moved in the direction of one of the diaphragms 11 (for purposes of illustration assume it is moved toward the diaphragm il at the left end of tube l as shown in FIG. l of the drawing) with suiiicient force to strike and unseat the diaphragm lll from its seated position on its corresponding valve seat liti. The impact of piston 5 against the diaphragm ll displaces it so as to fully uncover the valve seat lt?. A surge of compressed air from the annular iiuid pressure delivery chamber 14 iiows past the valve seat l@ into bore S and into contact with piston 5. Piston 5 is then propelled by the compressed air through bore 3 in the direction of the diaphragm l1 at the right end of tube l. The compressed air in bore 3 is rapidly exhausted through longitudinal exhaust slit d. Unseated diaphragm ll, after piston 5 moves away, is then immediately seated again by the pressure of the air in the fluid pressure supply chamber 13 acting thereon.

The force applied to piston 5 by the compressed air causes piston S to travel the length of bore 3 and to strike the diaphragm il at the right end of tube l thereby unseating the latter. Once again, a blast of ready compressed air ows past the corresponding valve seat i9 and acts against piston S so as to cause it to travel letward in the reverse direction and to thus complete one cycle of the yarn guide 6. The air is exhausted through the longitudinal exhaust slit it, as occurred after the rst stroke of piston S, and the unseated diaphragm 1i. at the right end of tube l returns to its seated position against its corresponding valve seat i@ by the action of the compressed air in chamber 13. Piston 5 is thus shuttled in the manner described back and forth in tube 1. Yarn 22, being positioned in slot 7, is thus operatively carried back and forth substantially uniformly across the face of rotating bobbin 23 oi' the talreeup device 24. The improved traverse device as described provides traversing speeds of approximately` 300D-6000 strokes per minute.

rl`he impact stress as well as the bounce-back elect commonly encountered where elements formed of nonresilient material are used are reduced by the resilient diaphragme ll. lThe arrangement 0f the annular liuid pressure delivery chambers i4, each in surroundment of a respective valve seat 1d, provides a ready source of compressed air immediately upon impact of piston 5 with diaphragms lll because the specific valve and valve seat construction provided permits full and instant uncovery of the valve seats 16.

In FIG. 3 a preferred type ot resilient diaphragm 1l is shown having a plurality of spaced periorations 12 arranged circumferentially on the diaphragm l1 and having a piurality ot mounting holes 25.

The novel traverse device is simple in construction and inexpensive to manufacture. Traversing of a yarn may be accomplished at speeds of approximately 3000-6000 strokes per minute by actuation of a movable piston and a pair of resilient diaphragms.

it is to 'oe understood that changes and variations may be made without departing from the spirit and scope of the invention as deiined in the appended claims.

What is claimed is:

1. A high speed pneumatic traverse device for reciprocating a yarn across the face of a take-up device, said traverse device comprising,

(a) a casing providing a pair of spaced cavities having communication therebetween via a bore defined Within said casing,

(b) a valve seat formed in said casing at each end of said bore and Within a respective cavity,

(c) a slit in said casing between said pair of spaced cavities and opening from said bore to atmosphere,

(d) a piston slidably operable within said bore,

\(e) said piston having a portion projecting through said slit and being adapted to carry said yarn back forth exteriorly of said casing,

(f) resilient means having perforations therein secured within said casing and disposed within each of said cavities,

(g) each of said resilient means having a iiuid pressure supply chamber defined at one side thereof which constantly communicates with a fluid pressure delivery chamber dened at the opposite Side thereof via said perforations in said resilient means,

(lz) a line normally charged with compressed air from a source thereof,

(i) a pair of port in said casing,

(j) each of said ports opening into a respective uid pressure supply chamber and being adapted to be connected to said line for supplying said iuid pressure supply chamber with compressed air, wherein,

(k) the force of the compressed air in each of said iiuid pressure supply chambers normally biases said resiiient means therein into seated position on a corresponding valve seat and acts to reciprocate said piston back and forth in said bore t0 traverse the yarn when said piston alternately unseats said resilient means and permits compressed air to tlow from said fluid pressure delivery chambers into said bore past said valve seats.

2. A high speed pneumatic traverse device as in claim l, wherein said resilient means comprises expansible diaphragms.

3. A high speed pneumatic traverse device as in claim 1, wherein said valve seats are annular and said iuid pressure delivery chambers encircle said annular valve seats and, wherein said resilient means are coaxially arranged with said annular valve seats in said cavities.

4. A high speed pneumatic traverse device for reciprocating a yarn across the face of a take-up device, said traverse device comprising,

(a) a casing providing a pair of spaced cavities having communication therebetween via a longitudinal bore defined in said casing,

(b) an elongate slit in said casing between said pair of spaced cavities and opening from said longitudinal bore to atmosphere,

(c) an annular valve seat formed in said casing at each end of said longitudinal bore and within a respective cavity,

(d) a piston slidably operable within said bore,

(e) a guide adapted to carry a yarn and secured to said piston,

(f) said guide projecting through said slit and being adapted to carry said yarn eXteriorly of said casing,

(g) clamping means,

(h) a circular resilient diaphragm provided with perforations and being transversely disposed in each of said cavities,

(i) each of said circular resilient diaphragms being clamped at their outer peripheries between sections of said casing by said clamping means,

(j) each of said circular resilient diaphragms having a fluid pressure supply chamber defined at one side thereof which constantly communicates with a fluid pressure delivery chamber dened at the opposite side thereof via said perforations in said circular resilient diaphragm,

(k) a line normally charged with compressed air from a source thereof,

(l) a pair of ports in said casing,

(m) each of said ports opening into a respective fluid pressure supply chamber and being adapted to be connected to said line for supplying said fluid pressure supply chamber with compressed air, wherein,

(n) the force of the compressed air in each of said fluid pressure supply chambers normally biases said circular resilient diaphragms into seated position on a corresponding annular valve seat and acts to move said piston reciprocally in the longitudinal bore to traverse said yarn when said piston alternately unseats said circular resilient diaphragms by impact therewith and permits compressed air to flow from said fluid pressure delivery chambers into the longitudinal bore past said annular valve seats.

5. A high speed pneumatic traverse device for reciprocating yarn across the face of a take-up device, said traverse device comprising,

(a) a tubular member provided with a slit extending through the Wall thereof,

(b) a piston slidably operable within the bore of said tubular member,

(c) said piston having a guide portion projecting through said slit and being adapted to carry said yarn back and forth exteriorly of said tubular member,

(d) a sectioned casing with a cavity therein secured at each end of said tubular member,

(e) clamping means,

(f) an annular valve seat formed in each of said hollow sectioned casings,

(g) each of said annular valve seats being coaxially arranged with and open to the bore of said tubular member and to the cavity within its corresponding sectioned casing,

(h) a resilient diaphragm having perforations therein coaxially arranged with a corresponding annular valve seat within the cavity of each of said sectioned casings,

(i) each of said resilient diaphragms being clamped at its outer periphery between the sections of a respective sectioned casing by said clamping means,

(j) each of said resilient means having a fluid pressure supply chamber defined at one side thereof which constantly communicates with an annular lluid pres sure delivery chamber surrounding said annular valve seat and defined at the opposite side thereof via said perforations therein,

(k) a line normally charged with compressed air from a source thereof,

(l) a port in each of said sectioned casings,

(m) each of said ports opening into a respective fluid pressure supply chamber and being adapted to be connected to said line for supplying said fluid pressure supply chambers with compressed air, wherein,

(n) the force of the compressed air in each of said annular fluid pressure supply chambers normally biases said resilient diaphragm therein into seated position on a corresponding annular valve seat and acts to reciprocate said piston back and forth in the bore of said tubular member to traverse said yarn when said piston alternately unseats by impact therewith said resilient diaphragms and permits compressed air to flow from said annular fluid pressure delivery chambers into said bore of said tubular member past said annular valve seats.

6. A high speed pneumatic traverse device for reciprocating yarn across the face of a take-up device, said traverse device comprising,

(a) a tube having a longitudinal slit extending substantially the length and through the wall thereof so as to open the bore of said tube to atmosphere,

(b) a piston slidably operable within said bore of said tube,

(c) a guide with a slot therein fixedly secured to said piston and projecting through said slit in said tube,

(d) a valve assemblage having a sectioned casing with a cavity therein provided at each end of said tube,

(e) a passage formed in each of said sectioned casings,

(f) each passage being arranged coaxially with the bore of said tube so that one end thereof opens into said tube and the opposite end opens into said cavity,

(g) an annular valve seat formed in each of said sectioned casings at said opposite end of said passage and being arranged coaxially therewith,

(h) clamping means,

(i) a perforated resilient diaphragm arranged coaxially with a corresponding annular valve seat in the cavity of each of said sectioned casings,

(i) said resilient diaphragms in each of said sectioned casing being clamped between the sections thereof by said clamping means,

(k) each of said perforated resilient diaphragms having a fluid pressure supply chamber defined at one side thereof which is always open via said perforations therein in said diaphragms to a fluid pressure delivery chamber dened at the opposite side thereof,

(l) a threaded port in each of said sectioned casings open to said fluid pressure supply chamber,

(m) a line normally charged with compressed air from a source thereof and adapted to be connected to each of said threaded ports for normally charging said fluid pressure supply chambers with compressed air, wherein,

(n) the force of the compressed air in each of said fluid pressure supply chambers normally biases said resilient diaphragms therein into seated positions on corresponding annular valve seats and acts to reciprocate said piston back and forth in the bore of said tube to traverse said yarn when said piston a1ternately unseats said resilient diaphragms by impact therewith and permits compressed air to ow from said fluid pressure delivery chambers into said bore of said tube past said annular valve seats.

References Cited in the tile of this patent UNITED STATES PATENTS

Claims

1. A HIGH SPEED PNEUMATIC TRAVERSE DEVICE FOR RECIPROCATING A YARN ACROSS THE FACE OF A TAKE-UP DEVICE, SAID TRAVERSE DEVICE COMPRISING, (A) A CASING PROVIDING A PAIR OF SPACED CAVITIES HAVING COMMUNICATION THEREBETWEEN VIA A BORE DEFINED WITHIN SAID CASING, (B) A VALVE SEAT FORMED IN SAID CASING AT EACH END OF SAID BORE AND WITHIN A RESPECTIVE CAVITY, (C) A SLIT IN SAID CASING BETWEEN SAID PAIR OF SPACED CAVITIES AND OPENING FROM SAID BORE TO ATMOSPHERE, (D) A PISTON SLIDABLY OPERABLE WITHIN SAID BORE, (E) SAID PISTON HAVING A PORTION PROJECTING THROUGH SAID SLIT AND BEING ADAPTED TO CARRY SAID YARN BACK FORTH EXTERIORLY OF SAID CASING, (F) RESILIENT MEANS HAVING PERFORATIONS THEREIN SECURED WITHIN SAID CASING AND DISPOSED WITHIN EACH OF SAID CAVITIES, (G) EACH OF SAID RESILIENT MEANS HAVING A FLUID PRESSURE SUPPLY CHAMBER DEFINED AT ONE SIDE THEREOF WHICH CONSTANTLY COMMUNICATES WITH A FLUID PRESSURE DELIVERY CHAMBER DEFINED AT THE OPPOSITE SIDE THEREOF VIA SAID PERFORATIONS IN SAID RESILIENT MEANS, (H) A LINE NORMALLY CHARGED WITH COMPRESSED AIR FROM A SOURCE THEREOF, (I) A PAIR OF PORT IN SAID CASING, (J) EACH OF SAID PORTS OPENING INTO A RESPECTIVE FLUID PRESSURE SUPPLY CHAMBER AND BEING ADAPTED TO BE CONNECTED TO SAID LINE FOR SUPPLYING SAID FLUID PRESSURE SUPPLY CHAMBER WITH COMPRESSED AIR, WHEREIN, (K) THE FORCE OF THE COMPRESSED AIR IN EACH OF SAID FLUID PRESSURE SUPPLY CHAMBERS NORMALLY BIASES SAID RESILIENT MEANS THEREIN INTO SEATED POSITION ON A CORRESPONDING VALVE SEAT AND ACTS TO RECIPROCATE SAID PISTON BACK AND FORTH IN SAID BORE TO TRAVERSE THE YARN WHEN SAID PISTON ALTERNATELY UNSEATS SAID RESILIENT MEANS AND PERMITS COMPRESSED AIR TO FLOW FROM SAID FLUID PRESSURE DELIVERY CHAMBERS INTO SAID BORE PAST SAID VALVE SEATS.