US2751632A

US2751632A - Textile drawing mechanism

Info

Publication number: US2751632A
Application number: US246243A
Authority: US
Inventors: Dausch Erwin Friedrich
Original assignee: SKF Kugellagerfabriken GmbH
Current assignee: SKF GmbH
Priority date: 1950-09-23
Filing date: 1951-09-12
Publication date: 1956-06-26
Anticipated expiration: 1973-06-26
Also published as: GB735036A; FR62618E; NL96074C; CH298023A; BE505388A

Description

June 26, 1956 E. F. DAUSCH TEXTILE DRAWING MECHANISM 4 Sheets-Sheet 1 Filed Sept. 12 1951 Z fr M "Z June 26, 1956 E. F. DAUSCH 2,751,632

TEXTILE DRAWING MECHANISM Filed Sept. 12. 1951 4 Sheets-Sheet 2 I 5 H0. 4 J 7 g Mm 1 I L N I k 5.9 k 44 fly Wad M AGT June 26, 1956 E. F. DAUSCH TEXTILE DRAWING MECHANISM 4 Sheets-Sheet 3 Filed Sept. 12, 1951 57 INVENTOR.

[RW/N FRIED/WC DAUSC/r By 446! AGT June 26, 1956 E. F. DAUSCH 2,751,632

TEXTILE DRAWING MECHANISM Filed Sept. 12, 1951 4 Sheets-Sheet 4 By WM/ZAW/ P 2,751,632 Patented June-26,1956

TEXTILE DRAWING NIECHANISM Erwin Friedrich Bausch, Esslingen (Neckar), Wurttemburg, Germany, assignor to SKF Kugellagerfabnken Geseilscnaft mit beschrankter Haftung Appiication September 12, 1951, Serial No. 246,243

Claims priority, application Germany September 23, 1950 12 Claims. (Cl. 19-135) This invention relates to drawing mechanisms for textile machinery, and more particularly to devices for supporting and weighting the top rolls in such mechanisms.

The primary object of my invention is to generally improve textile drawing mechanisms, especially to simplify and cheapen the manufacture of their supporting and weighting devices.

An important object of my invention is to provide an intermediate member to hold the supporting device in position, whereby said intermediate member shall be secured to the underframe of the spinning machine.

One object of my invention is to simplify the so-called rear guide section of supporting devices and to make it possible to use a standard rear guide section for different types of drawing mechanisms.

Another object is to provide an intermediate member in which such dimensional changes can easily be incorporated as become necessary to adapt a standard rear guide section to a drawing mechanism.

To the accomplishment of the foregoing and other objects which will hereinafter appear, my invention consists in the apparatus elements and their relation one to the other, as hereinafter are more particularly described in the specification and sought to be defined in the claims. The specification is accompanied by drawings in which:

Fig. l is a longitudinal section through a textile drawing mechanism embodying features of my invention;

Fig. 2 is a cross section taken in the plane of the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary elevation;

Fig. 4 is a view similar to that of Fig. 1, but showing the supporting unit in a raised position, and also showing modified adjustment means;

Fig. 5 is a longitudinal section through a modified construction of the mechanism of my invention;

Fig. 6 is a sectional view of another modification of my mechanism; and

Fig. 7 illustrates still another modification.

Referring to the drawings, and first to Fig.1, in greater detail, a device which supports individual guiding and weighting means of the top rolls I and II- of a drawing mechanism for textile machinery is designated 1. This supporting device consists of a rear part In and a front part 1b, the latter part being telescopically received and movable within the former part. An intermediate member 51 which is approximately of U-shape'd cross sec: tion is mounted on a hexagonal. bar 2 that may be of a different cross section as well. The; supporting device 1, after it has been properly aligned, is secured in position by means of the member 51 relative to the" extent of the bar 2 with the aid of a screw 58. The device 1 and the guide arm 44 which carries half bearings for the rear pair of rolls I are mounted on a shaft 53, the device 1 for a tilting motion, and the guide arm for free pivotal movements, perpendicular to the plane of the drawing zone. Rotatably' mounted on the shaft 53 is also a lever 67 which is U-shaped and the side walls of which extend between the side walls ofthe member 51, this U being inverted. A projection 55 of this lever is urged toward recesses 14 by a weighting spring 7. These recesses are provided in a slide 3 disposed between the top of the lever 67 and the top portion of the part 1b. The slide 3 holds a guide arm 45 for half bearings of the center rolls II, and the spring 7 pertaining thereto. The springs 7 which weight the top rolls I and II bear by means of the slide 3 and the lever 67, respectively, upon the front part of the supporting device. The shafts of the top rolls are secured in position by suspension springs 5 provided on collars 4 of the half bearings shown. The supporting device 1 is secured in its operating position by means of a pawl 60 the two detents 89 of which are received under the noses 61 of the intermediate member 51. The slidably arranged pawl 60' is held in its locked position by a spring 62. The pawl 60 is arranged between the parts 111 and 1b, enclosing the part 1b from above in the form of an inverted U. The spring 62 bears upon a hook 600 of the pawl 60, which hook passes through the part 1a of the supporting device 1 and thus urges the pawl 60 into engagement with the member 51', securing the supporting device in its operating position. The part 1a is provided with a widened portion to accommodate the spring 62.

In order to release the supporting device 1-, the pawl 61) has to be moved against the force of the compression spring 62. While this is done, the detent 89' of the pawl 60 disengages the nose 61 of the member 51 and allows the supporting device 1 to be tilted into the position indicated in Fig. 4.

The front top rolls (not shown) are movable with the part 1b that may be telescopically moved, as has already been indicated, with the part In.

Associated with the rolls I and II. for free rotation are the lower rolls III and IV, respectively, the latter rolls being supported by the underframe 6 of the drawing mechanism.

Machining inaccuracies at one end of the supporting device, that amount only to fractions of a millimeter,

may result into a displacement of a few millimeters at the other end of the supporting device. Such displaceme'nt may, for instance, be due to deviations in the posi-- tions of the nose 61 of the member 51 or to varying shapes of the detent 89 of the pawl 60. Upon changing the position of the supporting device, the" nip between the rolls and the length of the respective contracted spring change likewise. However, a change of the nip and spring lengths must be avoided. For this purpose, I provide means for a fine adjustment of the supporting device, as shown in Figs. 2 and 3. At 59, the shaft 53 has eccentric portions so that the supporting device 1 the part 1a of which is mounted at 59 is moved up and down when the shaft 53' is turned. The point of contact between the pawl 60 and the nose 61, designated 89, serves as a center of rotation.

To avoid an undesired rotation of the shaft 53' under the influence of the spring-loaded supporting device 1, there is provided an arresting device. The latter consists of a square head (see Fig. 2) of the shaft 53', car ry ing a safety cap 66 witha square aperture,- and several pegs 85. These pegs are inserted in correspondingholes 87 bored in a circle about the centre of the eccentric portions 59 on the rear guide and supporting part in. Thus, a stepwise adjustment is elfecte'd. The steps correspond to the spacing of the holes. The shaft 53' may also be clamped by caulking it after the adjustmentof the supporting device has been effected. This eliminates the possibility of the shaft turning relative to the rear part la. I

Modified adjustment means are shown in Fig. 4. The

supporting device 1, together with the intermediate member 151, swings about the center of a bar 12 which is partly of a circular cross section and is also defined by a plane surface on the side opposite to the drawing mechanism. Two screws 80 bear upon the bar and press it against the intermediate member 151. Upon loosening the screws 80, the member 151 will turn about the bar, thus making possible micrometer screw adjustments.

Adjustments of the supporting unit may also be achieved by other means, i. e. by inserting sheet metal pieces or adding further displacement elements.

Fig. 4 illustrates the supporting device in a tilted position. It is arrested by means of a spring 63 which engages the latch 64 of the adjusting lever 67. The supporting device must be held in the raised position to allow aworker to remove and reinsert the rolls and to clean the drawing mechanism. To adjust the center pair II of the top rolls, the supporting device is swung to the rear, whereby the latch 64 of the lever 67 is depressed toward the pin 65 that holds the spring 63. When swinging the supporting device still further, the lever 67 is prevented to swing along due to the pin 65, so that the projection 55 of the lever 67 disengages one of the recesses 14 in the slide, 3. This renders ineffective the force exerted on the lever 67 by the respective spring 7 and makes it possible for the slide 3 which holds the arm 45 to be moved stepwise as desired in order to position the rolls H.

By swinging the supporting device toward the bottom rolls, the arresting

device

63, 64 is released. The projection 55 of the lever 67 will engage one of the recesses 14, and the weighting spring 7 of the rear rolls will again take over its function.

In the embodiment shown in Fig. 5,'the supporting unit 11 consists of the front guide part 11b and the rear guide part 11a. The latching of the unit is effected by means'of a swinging pawl 68, the detent 189 of which engages a nose 261 of the intermediate member 251. The central portion of the U-shaped pawl 68 bears a screw 81 which rests in a recess 94 of the rear part 11a. Upon loosening of the screw 81, the position of the supporting unit relative to the member 251 may be altered. A nut 82 is provided to secure the setting. The adjustment may be guarded against unauthorized resetting by the use of a cap as shown or by a crown nut.

The supporting unit 11, when moved to its tilted 'position, is held by means of a spring 75 fastened to the rear end of the supporting device or by a suitable formation of the supporting device. The spring 75 engages a recess 76. The member 251 is formed so as to allow the spring to slide upon a curved surface. The spring pressure upon the curved surface 79 gives rise to a frictional force that opposes the forward motion and prevents the supporting unit from slamming down once it has been released. The spring 75 also seals off the rear guide section In against incoming foreign matter. The adjustment means for the middle rolls H may be disengaged as in the mechanism of Fig. 1. The lever 167 is rotatably mounted on the shaft'153 and is provided at one end with a latch 164 and at the other end with the projection 155. This projection engages with one of the recesses 114 in the slide 13. However, in the present embodiment the stop pin 78 may be removed from its hole. The bar 22 has a triangilar cross section and curved contours. The top rolls I are weighted'by the spring 17 and are held in position by a suspension spring provided on the bearing collar 14.

According to Fig. 6, the supporting unit 21 is composed of the front guide part 21b and the rear guide part 21a. In this embodiment, the latching is effected by a pawl 168 and the engagement of the detent 289 of the pawl below the nose 361 of the intermediate member 351. There is a leaf spring 74 which extends between the parts 2 1a and 21b and has a central downward bend. The spring bears with its bend upon the pawl 168 at 168b and with its ends upon the upper portion of the rear part 21a, thus securing the pawl in its operating position. The pawl is designed to swing with its portion 168a around the vaulted portion 93 of the part 1a. When released, the supporting member may be tilted about the shaft 253. Similar means as described in connection with the view of Fig. 5 are used to hold the supporting unit in its tilted position, such means being designated 175, 176 and 179. The lever 267, with its latch 264 and its projection 255, as well as the recesses 214 in the slide 23 are likewise similar to the corresponding parts of the construction of Fig. 5.

A particularly simple mounting for the intermediate member 351 on the bar 32 is shown in Fig. 6. The lower end of the member 351 is provided with a slit 50 and is clamped around the bar 32 by bolts 57 and nuts 52. This mounting also permits a fine adjustment of i the supporting device and is capable of compensating for machine inaccuracies.

In the modification shown in Fig. 7, the supporting device 31 comprises a .front guide part 31b and a rear guide part 31a. The intermediate member 451 is mounted on the underframe 46 of the drawing mechanism by means of two bolts 180 connecting the underframe and the intermediate member along abutting

walls

146 and 181; The adjustment means include elongated apertures 98 in the wall 181 of the member 451 and inserted sheet metal pieces 99. A pin 69 latches the supporting device in its operating position. The pin is connected to the guide arm'344 of the rear pair I of rolls by means of a tension spring 70 and is, thus, retained in its rearward position. Hexagon members 96 carried by the pin 69 are receivedunder the nose 361 of the intermediate member 451. One face of the members 96 contacts the surface 95 of the nose 361. An adjustment of the supporting device is effected by having the memhers-96 contact the intermediate member 451 at one .of their six surfaces each of which has a different distance from the axis of the pin, This effects a stepwise adjustment. By giving the upper part 71 of the latching piece a suitable curved shape, said pin may also be employed for securing the supporting device in the tilted position.

The pawl 367 is provided with a latch 364 and extension 355, the latter cooperatingwith recesses 314 in the slide 23, and is mounted on the shaft 353. The rear rolls I, which are secured in their position by the spring 35 provided on the half bearing 34, are held and guided by the arm 344 and weighted by the spring 37. A stop pin is designated 278.

The pin 278, similar to the action of the

pins

178, 78, and 65, shown in Fig. 6, Fig. 5, and Figs. 1 and 4, respectively, serves as an abutment for the latch 364. When the supporting device 31 (Fig. 7) is swung about the center of the shaft 353 to a raised position, the pawl 367 swings along until its end portion referred to as the latch 364 strikes against the pin 278. Upon swinging the supporting device still further, and with the spring 37 being no longer eifective, the extension 355 will disengage one of the recesses 314, thus making it possible for the slide 23 which is interposed between the pawl 367 and the front guide part 31b to be moved. By moving the slide 23 which supports indirectly the center rolls (not shown), it is possible to adjust the latter rolls as desired.

Revertingto Figs. 5 and 6, disengagement of the projections and 255 from a

recess

114 and 214, respectively, is similarly caused by the

latches

164, 264 and the pins 78, 178. With the projections disengaged, the

slides

13 and 23 are ready to bemoved, and the center rolls to be adjusted. It will be'apparent that wherever one top roll is shown in the various views, a pair of rolls is actually used. Each of the pairs of top rolls is mounted on a common axle which is centrally supported.

It is believed that the construction and operation of my textile drawing apparatus, as well as the many advantages thereof, will be understood from the foregoing detailed description thereof. Some of the advantages are reviewed hereinafter. The introduction of my intermediate member makes it possible to adapt a standard onesize supporting device to various spinning machines. The supporting device is securely held in its operating position, thus preventing objectionable operation of the drawing mechanism. The supporting device is mounted on the supporting bar by means of the intermediate member in a simple manner. The position of the supporting device perpendicular to the supporting bar is more secure. With the present invention, it is possible to provide a sturdy mounting on the supporting bar so that no lateral forces would displace the supporting device. The axis about which the supporting device swings is arranged so as to obtain a lifting of the top rolls off the bottom rolls in a direction perpendicular to the plane of the drawing zone. My invention provides for a convenient precision adjustment of the supporting device to compensate for dimensional inaccuracies. The intermediate member may be provided so that the supporting device will be adjustable both parallel and perpendicular to the axes of the rolls, the adjustment being preferably done with micrometer screws. The intermediate member houses most of the parts required for the adjustment and securing of the device. The adjustment of the middle pair of rolls is easier since the rear guide section has enough space for the elements of extremely simple latch means. By providing the removable stop pin, the operation of the device by unauthorized persons is easily prevented. To secure the supporting unit in a raised position, spring means have been included. Thus, both hands of the worker remain free to remove the top rolls and to clean the supporting and guiding members.

It will be apparent that while I have shown and described my invention in a few forms only, many changes and modifications may be made without departing from the spirit of the invention defined in the following claims.

I claim:

1. Textile drawing mechanism comprising a supporting device including a front part and a rear part, the front part being telescopically and movably received within the rear part, pairs of center and rear top rolls, a guide arm for each of said pairs of rolls, resilient means for applying weight to said guide arms, an underframe for the support of bottom rolls, a shaft in fixed relation to the underframe, the supporting device being arranged to be tilted about the shaft, a member arranged to slide along the front part of the supporting device, said member being provided with recesses, and a lever mounted on said shaft, said lever being provided at one end with a projection adapted to engage any one of said recesses.

2. In the mechanism according to claim 1, said lever being provided at its other end with a latch, an intermediate member articulated to the underframe and being provided with abutment means, the latch being adapted, upon tilting the supporting device, to strike against said abutment means.

3. In the mechanism according to claim 2, said abutment means including an indented leaf spring, the latch, upon tilting the supporting device, being adapted to be received in said leaf indentation to arrest the supporting device.

4. In the mechanism according to claim 2, a cross bar supported by the underframe and extending parallel to the axes of the rolls, the intermediate member being mounted on said bar for adjustments along and around the bar, and means to secure the intermediate member in its adjusted position.

5. In the mechanism according to claim 2, the intermediate member and underframe being screwed together across abutting walls, and means for adjusting the position of the intermediate member perpendicularly to said walls and parallel to the axes of the rolls, said means including elongated screw holes and sheet metal inserts.

6. In the mechanism according to claim 2, the intermediate member being U shaped in cross section, the shaft being supported by the side walls of the U and having eccentric extensions, said eccentric extensions supporting said rear part.

7. In the mechanism according to claim 2, a leaf spring being fastened to said rear part, the intermediate member being provided with a recess, the free end of said spring, upon the tilting of the supporting device, engaging said recess to hold the supporting device in its tilted position.

8. In the mechanism according to claim 2, a pawl slidably arranged longitudinally of the supporting device, the intermediate member being provided with at least one recess, and a compression spring arranged to bear upon the supporting device and urge the pawl into engagement with said recess.

9. In the mechanism according to claim 2, a pawl of inverted U-shape arranged for sliding movements between said front and rear parts and being provided with two detents, the intermediate member being provided with two recesses, and a compression spring arranged to bear upon the supporting device and to urge said detents into engagement with the recesses.

10. In the mechanism according to claim 2, a pawl, an adjustably arranged screw carried by the pawl, the screw bearing upon the said rear part, the intermediate member having a noselike formation, and the pawl engaging said formation to lock the mechanism in its operative condition.

11. In the mechanism according to claim 2, the rear part having an outwardly convexly formed portion, a pawl having a rounded portion fitting said convex portion at the inside for a swinging motion, the intermediate member having a noselike formation, and a spring bearing against the said rear part, the pawl being under the influence of said spring and engaging, with the mechanism in its operative condition, said noselike formation.

12. In the mechanism according to claim 2, a pin supported to lock the supporting device to the intermediate member in the operative position of the mechanism, a tension spring secured to the guide arm of the rear top rolls and acting on said pin, urging the pin into said locking position, and members carried by the pin and having a plurality of surfaces for varying contact with the intermediate member to adjust the position of the supporting device.

References Cited in the file of this patent UNITED STATES PATENTS

Claims

1. TEXTILE DRAWING MECHANISM COMPRISING A SUPPORTING DEVICE INCLUDING A FRONT PART AND A REAR PART, THE FRONT PART BEING TELESCOPICALLY AND MOVABLY RECEIVED WITHIN THE REAR PART, PAIRS OF CENTER AND REAR TOP ROLLS, A GUIDE ARM FOR EACH OF SAID PAIRS OF ROLLS, RESILIENT MEANS FOR APPLYING WEIGHT TO SAID ARMS, AN UNDERFRAME FOR THE SUPPORT OF BOTTOM ROLLS, A SHAFT IN FIXED RELATION TO THE UNDERFRAME, THE SUPPORTING DEVICE BEING ARRANGED TO BE TILTED ABOUT THE SHAFT, A MEMBER ARRANGED TO SIDE