US3113351A

US3113351A - Fly suction device for drafting arrangements

Info

Publication number: US3113351A
Application number: US752462A
Authority: US
Inventors: Naegeli Werner
Original assignee: Joh Jacob Rieter und Cie AG
Current assignee: Joh Jacob Rieter und Cie AG
Priority date: 1957-08-06
Filing date: 1958-08-01
Publication date: 1963-12-10
Anticipated expiration: 1980-12-10

Description

Dec. 10, 1963 w. NAEGELI FLY SUCTION DEVICE FOR DRAFTING ARRANGEMENTS Filed Aug. 1, 1958 s In IN VEN TOR. Mae/v59 NAiGEL/ A frog/V675 United States Patent Office ."i ,ll3,35 Patented See. it), lfifi 3,113,351 FLY DEVEQE FDR DRAFTTNG ARRitNQ-EMENTS Werner Nae elli, Winterthur, Switzerland, assignor to .ioh.

.l'acoh Pieter Co, Ltd, Winterthur, Switzerland, a

corporation of Switzerland Filed Aug. l, 1953, Ser. No. 752,462 Claims priority, application @witzerland Aug. 6, 1957 9 Claims. ((Il. 19-463) The present invention relates to a suction device for removing fly and dust from drafting arrangements in spinning machines.

In the conventional suction cleaning devices for drafting arrangements the suction air current is not sufficiently close to the fibrous web and does not effectively act on the material to seize and remove the fly as soon as it is formed. This disadvantage of the conventional cleaning devices impairs the uniformity of the fleece. This is particularly true, if the air current is conducted towards and from the drafting rollers in a plane which is normal to the rollers. It makes no difference whether the current is produced by suction or by blowing. The ineffectiveness of the air current of conventional systems is particularly apparent, if the distance between the nips of the pairs of drawing rollers is short because in this cas there is insufficient air current in the converging space between the fibrous web and the zone where the distances between the top rollers and the bottom rollers, respectively, are shortest. There is no room in this space for providing suction nozzles.

It is an object of the present invention to provide a suction system for drafting arrangements in which system the fly is seized as soon as it is formed and is as much as possible removed before it settles on the rollers. The system according to the invention avoids the disadvantages of the conventional systems by conducting the air, which removes the fly, parallel to the drafting rollers. The air is drawn in on one side of the drafting field, i.e., in the neighborhood of the bearings of the drawing rollers and flows along the rollers parallel to the rotation axes of the rollers and through the enclosure of the drafting arrangement on both sides of the fibrous web. The air current leaves the drafting arrangement in the neighborhood of the bearings of the rollers at the other side of the drafting field. The cleaning air is withdrawn from the side of the juxtapositioned drafting arrangement which side faces the side from which the air is withdrawn from the first drafting arrangement so that there are two parallel juX-tapositioned outlet or air withdrawal conduits which terminate in a common suction pipe. Ambient air is drawn into the system from the room in which the drawing frame is located, to avoid any unnecessary pressure drop as is the case if the air is drawn in through special inlet devices.

In order to make sure that the air flows parallel to the drawing rollers, the space in which the rollers are located is closed above and below the rollers by means of covers whose insides are provided with roller cleaning or wiping devices and with fly accumulators. These devices form a seal alongside the rollers separating the inside of the drafting arrangement in which the pressure is below atmospheric pressure from the air outside of the covers.

A preferred structure of the aforesaid fly accumulating and wiping means includes a plush-covered cushion on which the fly forms a brow which is torn off and thrown into the air current by a suitably positioned Wiping roller.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of embodiments thereof when read in connection with the accompanying drawing, in which:

Fl'G. 1 is a perspective part sectional illustration of a drafting arrangement equipped with suction means for removing fly according to the invention.

H6. 2 illustrates a modified portion of the suction means shown in FIG. 1.

Referring more particularly to FIG. 1 of the drawing, numerals 1 and 5 designate pairs of delivery rollers, numerals 4 and 7 designate pairs of feed rollers and numerals 2, 3, 6 designate drawing rollers. The journals of the rollers are shown only in part or are cut off altogether. A plurality of slivers, usually six to eight, of which only two are shown, enter the feed rollers through a suitable guide having a notch for each sliver. Only a portion of this guide is illustrated. The rollers form part of a preparatory drafting arrangement of a spinning machine and are supported by means of a roller stand 8 which is located between two drafting fields. A bearing saddle 9 is mounted on the stand 3 for supporting the delivery rollers 1 and 5. This saddle is not illustrated in detail because it is not part of the invention.

A bottom cover it) is secured by screws to the stand 3. This cover has a relatively wide central portion 11 and latenal portions 12 and 13 which extend along the drafting rollers. A suction duct 14 is connected .with. the portion 12 adjacent to the central portion 11 and a suction duct is is connected with the portion 13 also adjacent to the central portion ill. The ducts l d and 15 terminate in a main suction duct l6.

The central portion of a top cover 17 rests on the bottom cover 1% and completely covers the bearing saddle 9 and the saddles for the other rollers which saddles are not shown. The cover 17 includes lateral portions 18 and 19.

The lateral portions 12 and 13 of the bottom cover it) have upright rims 20 and 21, respectively, which are parallel to and end in close proximity of the rollers 4, leaving only a very small clearance through which air may leak in a direction which is normal to the desired direction of the air stream Within the covers. Likewise, the lateral portions 18 and 19 of the top cover 17 have downward rims 2i? and 21, respectively, which are parallel to and end adjacent to the top rollers '7. Gn the delivery side of the drafting arrangement, the delivery rollers l and 5 form a closure of the main dra ting field where most of the fly is developed. Cushions 22 are provided on the top cover 17 for forming a seal against the top rollers 5. The cushions 22 are held in a resilient holder 23 The latter has a vertical portion which is received in the U-shaped bottom rim 2d formed in a vertical portion 24 of the top cover portions 18 and 19'. The upper part of the resilient holder 23 partly embraces the cushions 2-2 and is so bent as to press the cushions against the top roller 5. The cushions are in the form of strips, preferably made of sponge rubber and have a cover which does not accumulate fly and has a fly shedding effec Similar sealing strips 22 are provided in similar, flat U-shaped holders which are mounted on the bottom cover it The central drafting rollers 2. and 3 which accumulate much fly are engaged by fly wiping cushions 25 and as which are similar to the

cushions

22 and 22 and are supported in the bottom cover 116.

The aforedescribed covers extend fields and terminate at the end of the cover of the top rollers. There is an opening at the locality of the bearings of the rollers, not shown, which bearings are distant from the locality where the juxtapositioned drafting fields face each other. The air flows through these openings in the direction of the arrows 33 into the channels formed by the covers lit and 17 and parallel to the rollers. The resulting air current is on both sides of the fleece and only over two drafting catches most of the fly developed on the fleece before it can settle on the rollers so that the

wiping elements

22, 22, 25 and 26 are substantially relieved. There is an axial air current also between the rollers 2, 3 and 6 which takes along the fly wiped off by the forward cushions 25.

The air current within the covers 12 and 18 is opposite to the current within the covers 13 and 19. In order to close the ends of the chambers formed by the covers 12 and 18 and by the covers 13 and 3.9

vertical walls

27 and 27 are provided normal to the axes of the rollers and have marginal portions in close vicinity of the journals of the rollers, leaving as little clearance as possible.

2 illustrates a modification of the wiping means on the top roller 5. Instead of a cushion 22 which has a surface which rejects fly a cushion 29 is provided which is covered with plush 28 or the like so that the fly will be accumulated and carried along to form a brow 30. Since the air current usually is insufficient to blow off the brow, a fly removal or knock-off device is provided in the form of a fluted roller 31 of relatively small diameter, the fluted roller resting on the top roller 5 and being driven thereby. The ends of the fluted roller 31 are supported in slots of hangers 32 which depend from the top cover portions 13 and The longitudinal axes of the slots are directed toward the roller 5. Whenever the fibrous brow 30' grows beyond a certain length it is seized by the ribs of the roller 31 and thrown into the space bet-ween the covers 10 and 17 and carried away by the air current and into the common suction duct 16.

I claim:

I 1. In a drafting arrangement of a spinning machine including parallel and spaced drafting rollers and delivery rollers, a suction arrangement for carrying away fly developed during the drafting operation, said suction arrangemnet including cover means placed parallel to said rollers and substantially closing the spaces between said rollers to the outside for forming an unobstructed air channel between said rollers which channel is parallel to said rollers and through which the material to be drafted moves in a direction which is substantially normal to the longitudinal axis of the channel, and means connected to said cover means adjacent to one end of said rollers for creating an air current flowing through said channel substantially parallel to and alongside the entire length of said rollers.

2. In a drafting arrangement according to clm'm 1 and including feed rollers, said air channel communicating with the outside at one end of said rollers, said cover means having a first rim portion adjacent to one of said delivery rollers and having a second rim portion adjacent to one of said feed rollers, sealing means being mounted on said first rim portion and engaging the respective delivery roller.

3. In a drafting arrangement according to claim 1 and wherein said cover means have a rim portion adjacent to one of the delivery rollers, fly wiping means being mounted on said rim portion and engaging the respective delivery roller, a fly removal means being mounted on said cover means in the vicinity of said fly wiping means for removing fly accumulating on said :wiping means and throwing the removed fly into said air channel.

4. In a drafting arrangement of a spinning machine including a pair of feed rollers, drafting rollers, and a pair of delivery rollers, a suction arrangement for carrying away fly developed during the draftinx operation, said suction arrangement including a top cover placed above said rollers, a bottom cover-placed below said rollers, said covers cooperating with said delivery rollers and said feed rollers to form an air channel substantially sealed from the outside and containing said drafting rollers, said air channel being parallel to said rollers, the material to be drafted moving through said air channel in a direction which is substantially normal to the longitudinal axis of said channel, said channel being open adjacent to one end of said rollers for providing an air inlet for said channel, and means connected to said bottom cover adjacent to the other end of said rollers for creating an air current flowing from said air inlet through said channel substantially parallel to and alongside the entire length of said rollers.

5. In a drafting arrangement as defined in claim 4 wherein said covers are stationary, fly wiping means being resiliently connected to one of said covers and placed adjacent to and having substantially the same length as one of said delivery rollers for wiping the fly off the respective delivery rollers and into said air channel.

6. In a drafting arrangement according to claim 5 and wherein said fly wiping means include fly accumulating means for retaining a substantial amount of fly.

7. In a drafting arrangement according to claim 6, fly removal means placed close to said fly wiping means for removing the fly from said wiping means and throwing the fly into the air channel.

8. In a drafting arrangement of a spinning machine having a plurality of drafting fields, each field including parallel and spaced drafting rollers and delivery rollers, a suction arrangement for carrying away fly developed during the drafting operation, said suction arrangement including cover means placed parallel to said rollers and substantially closing the spaces between said rollers to the outside for forming an unobstructed air channel between said rollers which channel is parallel to said rollers and through which the material to be drafted moves in a direction which is substantially normal to the longitudinal axis of the channel, said cover means being open adjacent to one end of said rollers for providing an air inlet to said channel, duct means connected to said cover means adjacent to the opposite end of said rollers, and a common air Withdrawal duct connected to said duct means of all drafting fields for receiving air fromsaid duct means and creating an air current flowing lfrom said inlets through said air channels between said rollers substantially parallel to and alongside the entire length of said rollers.

9. In a drafting arrangement having serially arranged sets of top and bottom rolls, suction clearing means comprising a duct, means creating a suction within said duct, at least a portion of one of said rolls being located within the duct, said duct confining the suction to a path substantially longitudinal of the roll, roll wiping means located within said duct, said roll wiping means engaging said portion of the roll and wiping the roll surface.

References Cited in the file of this patent UNITED STATES PATENTS 2,719,334 Buchanan Oct. 4, 1955 2,719,335 Buchanan et al Oct. 4, 1955 FOREIGN PATENTS 254,770 Switzerland I an. 3, 1949