US2974375A - Support system for the nipper plates in combing machines - Google Patents

Description

March 14, 1961 w. NAEGELl 2,974,375

SUPPORT SYSTEM FOR THE NIPPER PLATES IN COMBING MACHINES Filed May 28, 1958 3 Sheets$heet 1 INVENTOR. Wen/v53 lVA EGEL! March 14, 1961 w. NAEGELI 2,974,375

SUPPORT SYSTEM FOR THE NIPPER PLATES IN COMBING MACHINES Filed May 28, 1958 3 Sheeis-Sheet 2 INVENTOR. WEIENE/v? /\/4 EGEL BY @L:

March 14, 1961 w. NAEGELI 2,974,375

SUPPORT SYSTEM FOR THE NIPPER PLATES IN COMBING MACHINES Filed May 28, 1958 3 Sheets-Sheet 3 IN V EN TOR. WEE/VE/v? /VA EG'EZ ATTO/P/VEX SUPPORT SYSTEM FOR THE NIPPl'JR PLATES IN COMBIN G MACHINE Werner Naegeli, Winterthur, Switzerland, assignor to Joli. Jacob Rieter & Co., Ltd., Winterthur, Switzerland, a corporation of Switzerland Filed May 28, 1958, Ser. No. 738,526

Claims priority, application Switzerland June 1, 1957 8 Claims. (Cl. 19-416) The present invention relates to a combing machine for combing textile fibres and more particularly toa novel support for the nipper plates of the combing machine.

The invention is more particularly concerned with improvements in the swinging nipper mechanism of a comber of the Nasmith type.

The conventional combers include a nipper frame on which rests the entire length of the nipper plate. The plate is connected with the frame by a great number of screw connections.

The conventional nipper frame which is usually cast in one piece is heavy and bulky and rigidly interconnects four pins provided for attaching the swing arms. In a mechanism of this type great masses must be accelerated and retarded in rapid succession, causing considerable bearing loads and repair wear of the jointbearings. Excessive and ununiform wear of the bearing and loosening of individual pins in the nipper frame is frequently experienced with the conventional structures.

It is an object of the present invention to provide a support for the nipper plates in combers which support avoids the aforedescribed shortcomings of conventional structures by omitting the conventional nipper frame and providing a three-point support for the nipper plate whereby the nipper plate is directly held by two lateral arms or cheeks and a bracket. The cheeks are substantially coextensive with the width of the nipper plate. One check is arranged at each end of the nipper plate and is supported adjacent to the forward marginal portion or lip of the nipper plate. A pivotally supported bracket is connected to the middle of the rear portion of the nipper plate.

The omission of a heavy nipper frame is of advantage because the reduced masses permit a considerable increase of the number of combing operations per time unit without increasing wear.

The three point support according to the invention forms a statically definite system making impossible excessive wear of an individual hearing. The three point support affords increased elastic yieldability of the entire system permitting elastic deformation Within predetermined limits, if the nipper load is uneven, for example, because of an uneven supply of lap. The three point support does not only save one bearing of the nipper plate but also one rocker per comber head so that the initial cost is reduced.

The ununiform loads on the pins which are unavoidable with a four point support of an extremely rigid nipper frame constituting a statically indefinite system, causing loosening of the pins are avoided in a simple manner by the provision of a statically definite nipper plate support.

changing forces by fastening both ends of the pins, in-

stead of only one end, to reduce bending of the pins under load.

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 an embodiment thereof when read in connection with the accompanying drawing in which:

Fig. 1 is a diagrammatic perspective view of a nipper mechanism according to the invention.

Fig. 2 is a part sectional plan view of a nipper mechanism according to the invention, the top nipper being omitted.

Fig. 3 is a cross sectional view of a nipper mechanism according to the invention, the section being taken along line III-III in Fig. 2.

Referring more particularly to Fig. l of the drawing, numeral 3 designates a nipper plate or bottom nipper whose ends are inserted in lateral plates or cheeks 1 and 2 which are substantially coextensive with the width of the nipper plate. The forward ends of the cheeks 1 and Z are supported by one arm of double arms 5 and 6, the

I the aforesaid double arms.

" frame, not shown. The drive shaft 10 extends from the drive head from the comber, not shown.

Arms 11 and 12 laterally support a top nipper 13 which is also called the knife. The arms 11 and 12 are pivotally connected by means of pins 14 and 15 to the checks 1 and 2, supporting the bottom plate. The rear ends 16 and 17 of the arms 11 and 12, respectively, are pivoted to rockers 18 and 19, respectively, which are freely swingable on the oscillating drive shaft 10. Each of the rockers 18 and 19 includes a spring housing 20 into which extends a link rod 21 which is urged outwardly by means of a spring 22. The rear ends 16 and 17 of the arms 11 and 12, together with the bottom nipper 3, continue to take part in the return motion of the entire nipper mechanism for some time after closing of the nipper until the direction of oscillation of the shaft 10 is reversed, causing the link rods 21 to move into the respective housings 20 and compression of the springs 22.

The aforedescribed mechanism permits opening or folding of the top nipper 13, baring the bottom nipper 3 and a feed roller 23, not shown in Fig. 1, which roller rests in recesses 24 provided in the cheeks 1 and 2. Opening of the top nipper is effected against the action of the springs 22 beyond a labile dead center position until the mechanism is in the position shown in dotted lines in Fig. 1 and until an abutment 25 connected with the link rod 21 terminates swinging of the top nipper 13 in clockwise direction.

In the, embodiment of the invention shown in Fig. 3, the link rod 21 abuts against the upper part 27 of the forked rear end of the arm 11 when the top nipper is in fully open position.

The bracket 7 is removably connected with the center of the rear part of the nipper 3 by means of screw bolts 29 (Fig. 2). The insides of the lateral plates 1 and 2 are provided, adjacent to and below their middle portions, with recesses 30 into which the nipper plate is pressed or otherwise made fast. The lateral ends of the nipper plate may be glued into the respective recesses, for example, by an epoxy synthetic resin or the like.

A pivot pin 26 extends through the bores 31 and 32 in the front portions 33 and 34 of two neighboring checks 1.

. v 3 and 2, respectively. The thickness of 33 and 34 is reduced and the two-end support of the relatively short pin 26 reduces bending stress. The arms of the double armelements and 6 which ,are swingable on the comb shaft 4 are adjacent to and extend between opposed cheeks 1 and 2 of juxta-positioned bottom nippers 3. The pin 26 extends through roller bearings 35 in the free ends of the arms of the elements 5 and 6 which thus support the forward portions of the neighboring ends of two nipper plates 3. A pivot pin 15 which is inserted into the rear portions of the neighboring cheeks 1 and 2 extends through roller bearings 37 placed in downwardly extending ears 36 of the arms 11 and 12. The car 36 shown in section in Fig. 2 is part of an arm 11. A recess or cavity 38 on the outside of the cheeks 1 and 2 forms a hub 39 which is coaxial of the pin 15,'and accommodates a spiral spring 40 which is connected to and extends around the hub 39. The outer ends of the springs 40 individually engage a boss or trunnion at the end of the (feed roller 23, pressing the trunnion into a recess 24 inthe forward half of the respective cheek 1, 2 and closing the top of the recess. The bottom of the recess 24 is rounded to conform it with the boss of the feed roller and is widened on top to facilitate insertion of the feed roller into the recess.

The additional support of the rear portion of the nipper plate on the neighboring check by means of the pivot pin 15 for the top nip-per does not materially disturb the three-point support because the elastic characteristics of the pin 15 are of a magnitude which is difierent from the elastic characteristics of the nipper plate system and of the support elements 5, 6 and 9 (Fig. l).

I claim:

1. In a combing machine of the swinging nipper type, a bottom nipper plate having a forward marginal portion and a rear marginal portion, a cheek element connected to each end of said nipper plate and being subthe front portions I stantially coextensive with the width of the nipper plate,

a swingable support means pivoted to each of said check elements adjacent to said forward marginal portion, a bracket connected to said rear marginal portion, and a swingable support means pivoted to said bracket.

2. In a combing machine as defined in claim 1 and wherein said nipper plate is permanently unremovably connected to said cheek elements.

3. In a combing machine according to claim 2 and wherein said cheek elements are glued to said nipper plate by means of a synthetic resin.

4. In a combing machine as defined in claim 1, a top nipper, and pivot means pivotally connecting said top nipper to said cheek elements.

5. In a combing machine as defined in claim 1, a feed roller rotatably supported by said cheek elements.

6. In a combing machine according to claim 5 and wherein the ends of said feed roller are provided with trunnions, each of said cheek elements having a recess for receiving one of said trunnions.

7. Ina combing machine according to claim 6, a spring connected to each of said check elements and engaging the respective trunnion for pressing the latter into the respective recess.

8. In a combing machine according to claim 7, a top nipper, pivot means pivotally connecting said top nipper to said check elements, and a cavity in each of said check elements, said cavities individually surrounding said pivot means, each of said springs having a spiral portion coaxial of said pivot means and received in the respective cavity, and each of said springs having a free end portion engaging the respective trunnion.

' References Cited in the file of this patent UNITED STATES PATENTS 2,378,465 Crockett June 19, 1945 2,655,696 Gressel Oct. 20, 1953

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