US3561064A

US3561064A - Cage for the belts of a drawing mechanism

Info

Publication number: US3561064A
Application number: US587601A
Authority: US
Inventors: Sigmund Kemmler
Original assignee: Spindelfabrik Sussen Schurr Stahlecker and Grill GmbH
Current assignee: SKF GmbH; Spindelfabrik Suessen GmbH
Priority date: 1966-04-22
Filing date: 1966-10-18
Publication date: 1971-02-09
Anticipated expiration: 1988-02-09

Abstract

A CAGE FOR THE UPPER AND LOWER BELTS OF A DRAWING MECHANISM FOR A SPINNING MACHINE OR THE LIKE, WHEREIN THE CAGE IS PROVIDED WITH UNDIVIDED SIDE WALLS REMOVABLY SECURED TOGETHER IN SPACED RELATIONSHIP IN THE DIRECTION OF THE AXES OF THE DRAWING ROLLERS BY A SPACING RAIL AND GUIDE RAILS FOR THE BELTS MOUNTED BETWEEN THE SIDE WALLS. THE SPACING RAIL AND THE GUIDE RAIL FOR THE UPPER BELT ARE CONSTRUCTED TO BE INTERCHANGEABLE SO THAT CHARACTERISTICS OF THE BELT TENSION, SPACING AND SHAPE MAY BE CHANGED THEREBY BECAUSE THE GUIDE RAIL AND SPACING RAIL ARE DIFFERENTLY CONSTRUCTED WITH RESPECT TO EACH OTHER AND EACH SYMMETRICAL WITH RESPECT TO THEIR LONGITUDINAL AND TRANSVERSE DIRECTIONS.

Description

1 v KEWLER v v 3,561,064

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INVENTOR SIMUM kIW LR ATTORNEYS Feb. 9, 1971 I s. KEMMLER CAGE FOR THE BELTS OF A DRAWING MECHA Filed 00x. 18, 1966 NISM 2 Sheets-Sheet 3 l 51 INVENTOR S/G/ruzvo Kay/1&8?

ATTORNEYS United States Patent 3,561,064 CAGE FOR THE BELTS OF A DRAWING MECHANISM Sigmund Kemmler, Geislingen, Steige, Germany, assignor to Spindelfabrik Sussen, Schurr, Stahlecker & Grill G.m.b.H., Sussen, Wurttemberg, Germany Filed Oct. 18, 1966, Ser. No. 587,601 Claims priority, application India, Apr. 22, 1966, 104,961; Germany, Sept. 29, 1966, S 58,547 Int. Cl. D01h 5/88 US. Cl. 19-255 15 Claims ABSTRACT OF THE DISCLOSURE A cage for the upper and lower belts of a drawing mechanism for a spinning machine or the like, wherein the cage is provided with undivided side walls removably secured together in spaced relationship in the direction of the axes of the drawing rollers by a spacing rail and guide rails for the belts mounted between the side walls. The spacing rail and the guide rail for the upper belt are constructed to be interchangeable so that characteristics of the belt tension, spacing and shape may be changed thereby because the guide rail and spacing rail are differently constructed with respect to each other and each symmetrical with respect to their longitudinal and transverse directions.

The present invention relates to a cage for the upper and lower belts of a drawing mechanism for a spinning machine or the like, in which the cage is provided with undivided side walls which may be separated from each other in the direction of the axes of the drawing rollers, and with guide rails for the belts which are mounted between these side walls.

In the known cages for the upper and lower belts which are provided with undivided and inseparable side walls, the upper and lower belts are guided by means of a guide fork which engages into the loop of the upper belt and also into the loop of the lower belt. If the distance between the turning edge of the upper belt from that of the lower belt is to be changed which may become necessary for reasons of treatment of the material to be drawn, this guide fork must be removed from the cage and replaced by another fork by a rather complicated operation. Furthermore, since the head of the fork projects at least at one side from the side wall, the very undesirablerresult occurs that textile fibres will collect especially on these parts. These types of cages also have the disadvantage that, when they have become contaminated by a collection of fly, it is very difficult to remove such fly since the side walls of the cage are permanently secured to each other by riveted crossbars or the like.

Although there have already been cages of the type as first described above which are provided with separable side walls, in which the guide or turning bar for the upper belt is mounted so as to be removable from these walls, this guide bar projects at both sides beyond the walls of the cage, so that such a cage likewise has the tendency to accumulate fly and must therefore be frequently cleaned. Such a cleaning operation can, however, be carried out only with considerable dii'ficulty since it is a rather complicated procedure to remove and reinstall the belts. Furthermore, it is difficult to exchange the guide elements for the purpose of changing the distance between their outer guide or turning edges, and it is also not always possible or only by complicated operations to insure that the side walls of the cage will be accurately spaced at the proper distance from each other. A further very considerable disadvantage of these known cages is their relatively low stability.

3,561,064 Patented Feb. 9, 1971 It is an object of the present invention to eliminate these disadvantages of the known cages and to provide a simple cage which is easily accessible, may be easily operated and serviced, collects very little fly, insures a proper operation of the belts, and permits the belt guides to be easily adjusted when necessary. The present invention consists in designing the two side walls of the cage so as to permit them to be fitted together by means of the guide rail for the lower belt and to be separated from each other, and in maintaining these side walls at the proper distance from each other by means of the guide rail for the upper belt which is removably inserted into slots in the side walls, and by means of a spacing rail which is removably inserted into slots in the rear parts of the side walls. The rails may according to the invention be very easily assembled with the side walls and securely connected thereto by making the side walls of an elastic material which permits the guide rail for the upper belt and the spacing rail to be inserted into and removed from the slots by resiliently enlarging these slots.

Another feature of the invention consists in providing the two ends of the guide rail for the upper belt and those of the spacing rail with projections which are adapted to project into recesses in the outer sides of the side walls adjacent to the slots and the outer sides of which will then be flush with the outer sides of the side walls. The cage will thus have a very smooth shape which substantially prevents any accumulation of fly. Further advantages of the cage according to the invention will be attained by making the two ends of the guide rail for the upper belt and those of the spacing rail of a symmetrical shape in longitudinal and transverse directions. The effect of the rails will then always be the same regardless of the position in which they are inserted. This is important insofar as the guide rail is concerned since the position of the turning edge will thus also always remain the same. If according to another modification of the invention the guide rail for the upper belt and the spacing rail are made of the same dimensions at least at their ends which form their connection to the side walls, the guide and spacing rails may be exchanged for each other which permits the cage to be used for a greater length of time without requiring. any additional guide rails. In this case it may be of advantage to make the guide rail of a different thickness than the spacing rail. If the two rails are then exchanged for each other, the distance between the upper and lower guide rails will be changed whereby the pressure of the belts upon each other will also be changed. In this. manner it is also possible to change the shape of the belts at the turning edges of the guide rails.

Another advantage may be attained according to the invention by making the guide rail for the upper rail and the spacing rail of different widths. If these two rails are then exchanged for each other, the turning edge of the guide rail for the upper belt will be shifted more toward the front or toward the rear with the result that different pressures will be exerted upon the belts, the shape of the belts will also be affected, and unavoidable variations especially in the length of the belts may be compensated. In order to prevent the different guide and spacing rails which differ in thickness and width from each other in the manner as above described from being mistaken for each other and from thus being wrongly inserted in the desired position into the side walls of the cage, it is advisable to indicate these differences by suitable markings on the rails, for example, by making the different rails of different colors.

A further advantageous modification of the invention consists in providing the two ends of the guide rail for the lower belt with bores of an angular cross section which may be fitted over studlike projections on the side walls which are made of a corresponding cross section so that this guide rail will befirmly and nonrotatably secured to the side walls, although it may also be easily removed therefrom.

The most suitable means for guiding the lower belt consist according to the invention in making the guide rail for this belt of a closed triangular cross section. The upper and lower sides of this guide rail adjacent to the turning edge for the lower belt then serve for guiding this belt, while the rear side is spaced at a small distance from the lower roller. The free space within the loop of the belt is thus also filled out so that a considerable reduction in the accumulation of fly will be attained. Additional advantages may be attained if such a triangular guide rail for the lower belt is connected by plug connections to the side walls and if each of these plug connections is made of a triangular cross section and has at least two equal sides. This permits the guide rail to be installed in two ditferent positions so that by a reversal of the same rail the upper guide surface and the turning edge thereof for the lower belt may have different shapes or be disposed in different positions if the upper and lower sides of this rail adjacent to the turning edge are made of dif ferent shapes or are unsymmetrical relative to the plug connection. Especially when employing this plug connection which permits the guide rail for the lower belt to be reversed, but also when this guide rail is rigidly secured, considerable advantages may be attained if at least one of the sides of the guide rail which serves for guiding the lower belt is step-shaped in the direction of travel of the belt. If the guide rail is reversible as above described, it will then be possible in accordance with the particular operating requirements either to support the lower belt directly up to its turning edge or only up to a certain distance from this edge. When employing a cage according to the invention it will be similarly of advantage in certain cases if at least one of the two sides of the guide rail for the lower belt is provided adjacent to the turning edge with a trough-shaped recess.

The features and advantages of the present invention will become more clearly apparent from the following detailed description thereof which is to be read with reference to the accompanying drawings, in which FIG. 1 shows a side view of a cage according to the invention together with the associated upper and lower rollers and a centrally divided guide rail for the lower belt, in which the guide rail for the upper belt and the spacing rail are shown in cross section which is taken along the line 1-1 of FIG. 3, while the guide rail and the roller for the lower belt are shown in cross section;

FIG. 2 shows a top view of the cage according to FIG. 1, being broken off but without the upper roller and with- 1, with one end of guide rail 5 being broken off but without the upper roller and without belts;

FIG. 3 shows a cross section of the cage which is taken along the line III-III of FIG. 1, but without the lower roller and with a part of the carrier of the upper roller;

FIG. 4 shows a front view of the guide rail for the upper belt according to FIG. 1;

FIG. 5 shows a side view of the guide rail according to FIG. 4;

FIG. 6 shows a top view of the guide rail according to FIG. 4;

FIG. 7 shows a top view of a modification of the guide rail according to FIG. 6, in which the main body of the rail has a narrower width;

FIG. 8 shows a top view of a guide rail similar to that according to FIG. 7, but in which the main body of the rail is disposed unsymmetrically to its ends;

FIG. 9 shows a longitudinal section which is taken along the line IXIX of FIG. 10 of a cage similar to that as shown in FIG. 1, but provided with a step-shaped guide rail for the lower belt and with a plug connection at both sides;

FIG. 10 shows a cross section of a part of the cage according to FIG. 9, which is taken along the line XX of FIG. 9;

FIG. 11 shows a part of the sectional view according to FIG. 10, in which the position of the guide rail for the lower belt is reversed;

FIG. 12 shows a cross section of a part of a cage similar to that as shown in FIG. 10, but provided with a guide rail for the lower belt which is firmly secured to one side wall of the cage;

FIG. 13 shows a cross section of a guide rail for the lower belt which is provided with a trough-shaped recess, the section being taken along the line XIII-XIII of FIG. 14; while FIG. 14 shows a top view of the guide rail for the lower belt according to FIG. 13.

The cage according to the invention as illustrated in FIGS. 1, 2, and 3 has side walls 1 and 1a which are provided with recesses 2 for receiving the shaft 2a of the upper roller 2b and with recesses 3 for receiving the lower roller 3a of the drawing mechanism. Side walls 1 and 1a are further provided with slots 4 into which the guide rail 5 for the upper belt is inserted. As shown particularly in FIG. 1, these slots 4 have a width s in accordance with the thickness s1 of the bearing parts 5a of a guide rail 5 which have a width s2 and are defined by shoulders which engage with both sides of the side walls 1 and 1a of the cage which are provided at these points with recesses 1b, as shown in FIG. 2, so as to have a thickness s3 in accordance with the width s2 of the bearing parts 5a of guide rail 5. The two side walls 1 and 1a are therefore maintained at a definite distance from each other by the guide rail 5. When guide rail 5 is to be installed or removed, its bearing parts 5a must be pushed over the projections 12 on side walls 1 and 1a, whereby the width of slots 4 will be slightly increased resiliently. When installed, guide rail 5 will therefore be maintained in its proper position by the projections 1e. The outer shoulders on the bearing parts 5a of guide rail 5 are formed by lug-shaped projections 5b which are of a size so as to fill out the recesses 1b in the side walls so that the outer surfaces of these parts will be in alignment with the outer surfaces 10 of side wall 1 and 1a. Guide rail 5 is of a symmetrical shape both in longitudinal and transverse directions, as may be seen particularly in FIGS. 4, 5, and 6, and it may therefore be installed in the slots 4 so that its outer sides may face in one direction or the other without change of its position relative to the guide rail 8a, 8b for the lower belt or to the upper roller 2b and thus also without change of its guiding effect upon the upper belt 2c. The rear ends of side walls 1 and 1a are provided with further slots 6 which have the same dimensions as the slots 4 and are adapted to receive a spacing rail 7, the bearing parts 7a and the lugs 7b which are of the same shape and design as the bearing parts 5a and the lugs 5b of guide rail 5. However, the thickness :11 of spacing rail 7 is slightly smaller than the thickness s2 of guide rail 5, as may be seen by a comparison of FIGS. 3 and 4. Since they are of the same shape, rails 5 and 7 may be exchanged for each other. This permits the distance m between the lower edge of guide rail 5 and the guide rail 8 for the smaller belt to be varied since the lower thickness of rail 7 when inserted into the slots 5 increases the width m accordingly.

In order to facilitate the proper installation of the rails 5 and 7, they may be made of different colors, for example, white and red. If these rails consist of plastic, this may be attained by employing plastic raw materials of the respective colors. In the event that aside from the rails 5 and 7 it may be necessary to provide additional rails of different thicknesses so as to permit other widths m to be attained, these additional rails may be made of further colors. The different thicknesses of the rails may also be indicated by marking them in a suitable manner, as shown, for example, in FIG. 5, by the numeral 2.

Guide rail 8 for guiding the lower belt 3b consists of two hollow parts 8a and 8b of a triangular cross section which are rigidly secured to the side walls 1 and 10, respectively. The rail part 8a is rigidly provided with a slightly recessed hollow stud 8c which is likewise of a triangular cross section and projects into the bore in the rail part 812 so as to fit exactly therein and thereby to connect the two side walls 1 and 1a nonrotatably to each other. Except for stud 8c, parts 8a and 8b are mirror images. This connection does not, however, prevent the side walls 1 and 1a from being taken apart. The upper side 8d of guide rail 8 serves for supporting and guiding the lower belt 3b as well as the upper belt 20. The guiding or turning edge 8e of rail 8 guides the lower belt 3b smoothly downwardly to the lower side 8f which likewise serves for guiding the belt. The rear side 8g is arcuately curved substantially in accordance with the radius of the lower cylinder 3a and is spaced at a small distance therefrom. As shown especially in FIG. 3, the side walls 1 and 1a of the cage are further provided with recesses 1d which prevent the load carrier 2e forming a guide rail from coming in contact with the cage even in extreme positions when the side walls of the cage are moved to a close proximity to the load carrier. FIG. 3 also shows the manner in which the guide member 2f for the twin pressure roller 2b is guided within the load carrier 2e.

The

rails

75 and 85 according to FIGS. 7 and 8 may be employed like the rails 5 and 7 according to FIGS. 1 to 6 either as guide rails for the upper belt or as spacing rails. They differ from rails 5 and 7 which have a width b merely by having a smaller width b1 or b2. Rail 75 has a symmetrical shape in its longitudinal and transverse directions, while rail 85 is symmetrical only in its transverse directions. If guide rail 5 is replaced, for example, by rail 75, the distance will be reduced between the front edge of this rail and the roller for the upper belt, whereby the tension of this belt will also be reduced. If instead a guide rail of a greater width is inserted, the mentioned distance will be increased and the upper belt will be tightened or, if the belt is slightly longer, the same belt tension will then be attained. Rail 85 permits the distance between its front edge and the upper roller to be varied by inserting it in the reverse position. The different widths of the rails as well as their different thicknesses may be indicated by making them of different colors or by applying different markings thereon.

FIGS. 9 and 10 illustrate a guide rail 108 for the lower belt in the form of a one-piece rail which is fitted at both sides over the

triangular projections

101b and 1010 on the side walls 101 and 101a. The upper'side of this guide rail is divided into two surfaces 108d1 and 108d2 which are step-shaped relative to each other, while the lower side 108 and the rear side 108g are designed in the same manner as on the guide rail according to FIG. 1. The projections 10 1b and 101c and the corresponding bores in guide rail 10-8 form equilateral triangles with a plane of symmetry extending along the section line X--X of FIG. 9. This permits the guide rail 108 also to be installed in the reverse position, as shown in FIG. 11. The cage may therefore be employed either with a step-shaped or a smooth upper guide surface for the lower belt without requiring any additional parts. The guide rail for the lower rail which is secured at both sides as shown in FIG. 10 may when necessary also be exchanged for a different rail.

FIG. 12 illustrates a guide rail 128 for a lower belt which is rigidly secured only at one side to one side wall 121a and is fited over the studlike projection 12112 on the other side wall 121.

FIGS. 13 and 14 finally show a guide rail which is similar to the rail according to FIG. 1 and consists of two rail parts 138a and 138b. The part 138a is integrally provided with a stud 138c that is telescopically received within part 1381? in a manner similar to part 8c of FIGS. 1 and 2. The upper side 138d of this guide rail is provided with a curved V-shaped recess 138k which serves for the same purpose as the step-shaped surface 108d2 of FIG. 9, namely, for locally affecting the belt pressure in the desired manner. Instead of providing this recess only a part of the upper side 138d, it may also extend continuously in the longitudinal direction of the guide rail.

Although my invention has been illustrated and described with reference to the preferred embodiments thereof, I wish to have it understood that it is in no way limited to the details of such embodiments but is capable of numerous modifications within the scope of the appended claims.

Having thus fully disclosed my invention, !what I claim is:

1. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, and further having corresponding front slots in the front parts thereof and corresponding rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said upper guide rail and said spacing rail constituting means for securing said side walls at a definite distance from each other, a lower guide rail for said lower belt between said side walls, and means on said lower guide rail and on at least one of said side walls for removably plugging said side walls to each other, said rail ends constituting means for operatively connecting said guide rail in said front slots and said spacing rail in said rear slots, the outer sides of said side walls having recesses adjacent to said slots, the ends of said upper guide rail and said spacing rail having lateral projections thereon adapted to project into said recesses and having such a width that the outer sides of said projections will then be flush with the outer sides of said side walls.

2. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, and further having corresponding front slots in the front parts thereof and corresponding rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said upper guide rail and said spacing rail constituting means for securing said side walls at a definite distance from each other, a lower guide rail for said lower belt between said side walls, and means on said lower guide rail and on at least one said side walls for removably plugging said side walls to each other, said rail ends constituting means for operatively connecting said guide rail in said front slots and said spacing rail in said rear slots, said upper guide rail and said spacing rail having a different thickness constituting means for changing the front shape of the upper belt by interchanging said rails.

3. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, and further having corresponding front slots in the front parts thereof and corresponding rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side Walls and having ends removably inserted into said rear slots, said upper guide rail and said spacing rail constituting means for securing said side walls at a definite distance from each other, a lower guide rail for said lower belt between said side walls, and means on said lower guide rail and on at least one of said side walls for removably plugging said side walls to each other, said rail ends constituting means for operatively connecting said guide rail in said front slots and said spacing rail in said rear slots, said upper guide rail and said spacing rail having different widths constituting means for changing the tension on said upper belt by interchanging said rails.

4. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, and further having corresponding front slots in the front parts thereof and corresponding rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said upper guide rail and said spacing rail constituting means for securing said side walls at a definite distance from each other, a lower guide rail for said lower belt between said side walls, and means on said lower guide rail and on at least one of said side walls for removably plugging said side walls to each other, said rail ends constituting means for operatively connecting said guide rail in said front slots and said spacing rail in said rear slots, said plugging means including associated means on both side walls and on both ends of said lower guide rail for plugging said lower guide rail together with both side walls, each of said means having a triangular cross section with at least two equal sides so as to permit said lower guide rail to be connected in at least two different positions to said side walls, said lower guide rail having a substantially triangular cross section with one side facing the lower roller and spaced at a small distance therefrom, said lower belt being guided by the two other sides of said lower guide rail and extending along the same to and around said lower roller, at least one of said two other sides being step-shaped in the direction of travel of said lower belt.

5. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, and further having corresponding front slots in the front parts thereof and corresponding rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said upper guide rail and said spacing rail constituting means for securing said side walls at a definite distance from each other, a lower guide rail for said lower belt between said side walls, and means on said lower guide rail and on at least one of said side Walls for removably plugging said side walls to each other, said rail ends constituting means for operatively connecting said guide rail in said front slots and said spacing rail in said rear slots, said plugging means including associated means on both side walls and on both ends of said lower guide rail for plugging said lower guide rail together with both side walls, each of said means having a triangular cross section with at least two equal sides so as to permit said lower guide rail to be connected in at least two different positions to said side walls, said lower guide rail having a substantially triangular cross section with one side facing the lower roll and spaced at a small distance therefrom, said lower belt being guided by the two other sides of said lower guide rail and extending along the same to and around said lower roller, at least one of said two other sides having a trough-shaped recess adjacent to the edge between said two sides.

6. A cage for the upper and lower drawing rollers of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, which includes a pair of undivided, substantially parallel side walls spaced from each other and provided with recesses for receiving said rollers, and upper and lower guide means for the upper and lower belts, characterized in that open-ended slots are provided in the front parts of the side walls and in the rear parts of the side walls, and means for securing together said side walls at a predetermined spacing from one another, said last-mentioned means being constituted substantially exclusively by separate, interchangeable rail means having connecting means at the ends thereof for engagement in said slots and forming bearing shoulders engaging the outside of the side walls, each rail means being adapted to be inserted at both ends thereof into corresponding slots of the side walls from the outside thereof by mere insertion of the connecting means through the open ends of the slots, and said rail means including one of said guide means and a spacing rail.

7. A cage according to claim 6, characterized in that the open slots are provided in the front and rear parts of the side walls on opposite sides of a transverse plane through said recesses.

8. A cage according to claim 7, characterized in that said slots are provided near opposite ends of said side walls.

9. A cage according to claim 6, characterized in that said side walls are provided with recesses forming abutment surfaces for said bearing shoulders, the depth of said last-mentioned recesses being substantially equal to the thickness of the bearing shoulders so that the outside of said bearing shoulders is substantially flush with the outside of the side walls.

10. A cage according to claim 6, characterized by means in said slots for holding said connecting means in the assembled, installed position in said slots.

11. A cage for an upper drawing roller and for a lower drawing roller of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, said side walls being further provided with corresponding open front slots in the front parts thereof and corresponding open rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said slots being open in the direction of the external contour of said side walls to enable insertion of said rails from the outside in the direction of said slots, means forming a lower guide rail for said lower belt between said side walls, and further means including both ends of said upper guide rail and of said spacing rail for operatively connecting said upper guide rail and said spacing rail in said slots by insertion through the open ends to thereby secure said side walls at a definite distance from each other, the outer sides of said side walls having recesses adjacent to said slots, the ends of said upper guide rail and of said spacing rail having lateral projections thereon adapted to project into said recesses and having such a width that the outer sides of said projections will then be substantially flush with the outer sides of said side walls.

12. A cage for an upper drawing roller and for a lower drawing roller of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, said side walls being further provided with corresponding open front slots in the front parts thereof and corresponding open rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said slots being open in the direction of the external contour of said side walls to enable insertion of said rails from the outside in the direction of said slots, means forming a lower guide rail for said lower belt between said side walls, and further means including both ends of said upper guide rail and of said spacing rail for operatively connecting said upper guide rail and said spacing rail in said slots by insertion through the open ends to thereby secure said side walls at a definite distance from each other, each side wall being provided with means near the open entrance of each slot to maintain said upper and guide rails in the proper assembled position installed in said slots, each upper and guide rail being of relatively much greater length than thickness and having a substantially flat surface portion on one side and a curved surface portion on the opposite side.

13. A cage for an upper drawing roller and for a lower drawing roller of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, said side walls being further provided with corresponding open front slots in the front parts thereof and corresponding open rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserted into said rear slots, said slots being open in the direction of the external contour of said side walls to enable insertion of said rails from the outside in the direction of said slots, means forming a lower guide rail for said lower belt between said side walls, and further means including both ends of said upper guide rail and of said spacing rail for operatively connecting said upper guide rail and said spacing rail in said slots by insertion through the open ends to thereby secure said side walls at a definite distance from each other, each upper and guide rail being of relatively much greater length than thickness and having a substantially flat surface portion on one side and a curved surface portion on the opposite side.

14. A cage for an upper drawing roller and for a lower drawing roller of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, said side walls being further provided with corresponding open front slots in the front parts thereof and corresponding open rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends re- 10 movably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserated into said rear slots, said slots being open in the direction of the external contour of said side walls to enable insertion of said rails from the outside in the direction of said slots, means forming a lower guide rail for said lower belt between said side walls, and further means including both ends of said upper guide rail and of said spacing rail for operatively connecting said upper guide rail and said spacing rail in said slots by insertion through the open ends to thereby secure said side walls at a definite distance from each other, said upper guide rail and said spacing rail having different thicknesses to enable change of the pressure of the belt upon each other by interchanging the two rails.

15. A cage for an upper drawing roller and for a lower drawing roller of a drawing mechanism for a spinning machine or the like and for the upper and lower belts for driving said rollers, comprising a pair of undivided parallel side walls spaced from each other and having recesses for receiving said rollers, said side walls being further provided with corresponding open front slots in the front parts thereof and corresponding open rear slots in the rear parts thereof, an upper guide rail for said upper belt between said side walls and having ends removably inserted into said front slots, a separate spacing rail between said side walls and having ends removably inserated into said rear slots, said slots being open in the direction of the external contour of said side walls to enable insertion of said rails from the outside in the direction of said slots, means forming a lower guide rail for said lower belt between said side walls, and further means including both ends of said upper guide rail and of said spacing rail for operatively connecting said upper guide rail and said spacing rail in said slots by insertion through the open ends to thereby secure said side walls at a definite distance from each other, said upper guide rail and said spacing rail having different width to enable a change of the tension on the upper belt by interchanging said two last-mentioned rails.

References Cited UNITED STATES PATENTS 1,240,670 9/1917 Casablancas 19-255 2,944,300 7/1960 Swanson 19-254 3,267,526 8/ 1966 Pippin, Ir., et al 19-245 3,290,732 12/1966 Pitts 19-255 3,336,637 8/1967 Ingham, Jr. 19-245 2,557,036 6/1951 Pope 19-255 3,132,384 5/1964 Newton 19-245 3,386,136 6/1968 Pitts et a1. 19-255 DORSEY NEWTON, Primary Examiner