US2705818A - Weighting apparatus for drafting rolls - Google Patents

Description

g a 1955 F. KALWAITES WEIGHTING APPARATUS FOR DRAFTING ROLLS Filed April 14, 1954 s Shets-Sheet 1 I N V EN TOR.

FRANK KALWAITES AT TX April 1955 F. KALWAITES WEIGHTING APPARATUS FOR DRAFTING ROLLS Filed April 14. 1954 3 Sheets-Sheet 2 E .n RA mm A VK mK N A R .r

April 1955 F. KALWAITES WEIGHTING APPARATUS FOR DRAFTING ROLLS Filed April 14. 1954 3 Sheets-Sheet 3 INVENTOR FRANK KALWAITES A T'Y.

United States Patent WEIGHTING APPARATUS FOR DRAFTING ROLLS Frank Kalwaites, Grafton, Mass., assignor to Whitin Machine Works, Whitinsville, Mass., a corporation of Massachusetts Application April 14, 1954, Serial No. 423,010

7 Claims. (Cl. 19-135) This invention relates to the application of pressure to the top rolls of a textile drawing frame.

It is the general object of my invention to provide improved apparatus for simultaneously weighting a set of front, middle and back top rolls and for conveniently releasing the pressure thereon when so desired.

A further object is to provide weighting apparatus which is easily adaptable to changes in the transverse spacing of the drafting rolls. I also provide a construction by which an increase in the transverse spacing of the front and back rolls automatically increases the relative pressure on the front rolls.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the draw ings, in which Fig. 1 is a side elevation of a portion of a drawing frame embodying my improved weighting apparatus;

Fig. 2 is a sectional side elevation of the parts shown in Fig. l but in a slightly different adjustment;

Fig. 3 is an enlarged detail sectional side elevation of a pressure-applying construction;

Fig. 4 is an enlarged sectional side elevation, taken along the line 44 in Fig. 8 and showing the provision for both vertical and horizontal adjustment of the main lever pivot;

Fig. 5 is an enlarged sectional side elevation of a release lever and certain associated saddle members;

Fig. 6 is a detail sectional elevation, taken along the line 66 in Fig. 5;

Fig. 7 is a detail sectional elevation, taken along the line 77 in Fig. 2;

Fig. 8 is a detail sectional rear elevation, taken along the line 8-8 in Fig. 4; and

Fig. 9 is a partial transverse sectional rear elevation, taken along the line 99 in Fig. 3.

Referring to Figs. 1 and 2, I have shown a portion of a drawing frame F on which a longitudinal series of fixed brackets B are mounted. I have also shown a pair of front rolls 10 and 11, middle rolls 12 and 14, and

back rolls and 16.

The front bottom roll 10 is continuously rotated in fixed bearing blocks (not shown), and the front roll 11 is mounted for free frictional rotation by the bottom roll 10. The middle bottom roll 12 and the back bottom roll 15 are continuously rotated in bearings which may be transversely adjusted on supports carried by the frame F.

The middle top roll 14 is preferably driven by gears 17 and 18 from the middle bottom roll 12, as shown in Fig. 2, and is held in desired relation to the bottom roll by a gear cover and easing member 20, vertically slidable in a support 21.

The support 21 (Fig. 7) is secured by a screw 22 to a rectangular cross bar 23, normally held in fixed position but adjustable to vary the transverse location of the middle rolls. The middle rolls 12 and 14 are commonly provided with long-draft aprons 24 and 25 as indicated in Fi 1.

in of the parts thus far described may be of conventional construction and are not specifically claimed herein.

I will now describe the improved apparatus which I have provided for weighting or applying pressure to the top rolls 11, 14 and 16.

For this purpose, a main lever (Fig. l) is pivoted at 31 (Fig. 4) in a casing 32 which may be secured in forward or rearward adjustment on one of the brackets ice B previously described. The lever 30 is preferably of slotted rectangular tubular construction, and the pivot 31 comprises a stud extending through the body portion 34 (Fig. 8) of a rod having threaded portions 35 and 35a at its ends.

Nuts 36 and 37 may be adjusted to raise or lower the pivot stud 31 relative to the casing 32. The lower threaded portion 35a extends through a backing 38 which is to be inserted in a selected hole 39 in the bracket B. By tightening the nut 37, the casing 32 may be locked to the bracket B in a desired horizontal position.

An arm 40 (Fig. 3) is pivoted at 41 on a block 42 which is slidable in the slotted tubular main lever 30 and which is provided with a cross pin 43 and with a clamping screw 44. By applying pressure by turning the screw 44, the pivot stud 41 and cross pin 43 may be actuated to clamp the member 42 to the lever 30.

The arm 40 embraces the main lever 30 as shown in Fig. 9, and is provided with an elongated stud 50, extending upwardly through a relatively heavy coil spring 52 and through an open cylinder 54 fixed to the lower end of an upwardly-extending back link 55 (Fig. 1).

At its upper end, the spring 52 (Fig. 3) is enclosed in a shell 57 secured to the rod by a washer 58. The shell 57 is slidable within the open cylinder 54, and the spring 52 normally seats the lower end of the cylinder 54 firmly on the upper surface of the arm 40, which constitutes the locating base for the cylinder 54 and for the lower end of the back link 55. The middle portion of the link (Fig. 2) is slotted at 60 to embrace a fixed rod 61 by which sliding upward and downward movement of the link is directed.

At its upper end, the link 55 is connected by a pivot 62 (Figs. 2 and 5) to a release lever 64 having a bearing portion 65 '(Fig. 5) engaging the axle or gudgeon 66 of the back top roll 16. A U-shaped spring clip 67 associated with the bearing member 65 detachably retains the part 66 in the release lever 64.

An outer saddle member 70 (Fig. 5) is also pivoted at 62 on the upper end of the back link 55 and is of U-shaped section, so that it may enclose and telescope an inner saddle member 72. The lower edges 74 of the outer saddle member 70 embrace the inner saddle member 72 as shown in Fig. 7.

These two members may be secured in longitudinally adjusted telescoped position by tightening a screw 75 (Fig. 5) having a threaded bearing in the front end of the outer member 70 and engaging a plate 76 resting on the top surface of the inner member 72. When the screw 75 is tightened, the members 70 and 72 act as a single unit.

A saddle bar 77 (Fig. 5) is connected to the inner saddle member 72 by a pivot stud 78 and has an elongated or tail portion 79 extending rearward inside of the member 72 and engaging the upper end of the gear cover or casing member 20.

An elongated front link 80 (Figs. 2 and 5) is pivoted at its lower end at 81 to the front or short end of the lever 30. At its upper end, it is provided with a hook 82 which engages the stud 78 which connects the front end of the saddle member 72 to the saddle bar 77.

With these connections, it will be seen that the heavy spring 52 acts through the rod 50 and link 55 to pull the members 64, 70 and 72 downward. At the same time, the spring 52 tends to raise the long end of the lever 30 and to shift the pivot stud 81 at the short end of the lever 30 downward, thus applying a relatively heavier downward pull to the hook link 80.

As the hook link 80 transmits this downward pull to the cross pin 78 and saddle bar 77, the major part of this down-pull is applied to the front top roll 11, but a minimum portion is simultaneously applied through the arm or tail 79 and the casing 20 to the middle top roll 14.

When it is desired to relieve pressure on the top rolls to permit removal thereof or for any other purpose, the release lever 64 is swung upward about its pivot 62 to the position shown in broken lines in Fig. 2.

Such upward movement of the lever 64 swings the back top roll 16 forward and upward as also indicated in Fig. 2, and thus permits the back link 55 to move downward and relieve the effective pressure of the spring 52. This downward movement of the back link 55 also permits the short front end portion of the lever 30 to move upward and to thus relieve the pressure of the hook 82 at the upper end of the front link 80 on the cross pin 78.

The link 80 can then be swung backward or clockwise to clear the pin 78, after which the entire saddle structure comprising the parts 70, 72 and 77 may be swung upward about the pivot 62 to a raised position in which the back top roll 16 and the front top roll 11 may be removed for cleaning or replacement if desired.

If it is not desired to'remove the top rolls from the saddle structure, the spring-holding clips as 67 and 670 (Fig. 5) will retain the rolls in their bearing structures.

The front link 80 may have an offset lower end portion 80a (Fig. 4) which will engage the upper inner surface of the lever 30 and thus limit forward displacement of the link 80 when the saddle structure is raised.

If the relative spacing of the back rolls 15 and 16 from the front rolls and 11 is changed, the block 42 is to be correspondingly shifted along the main lever 30. It will be noted that Fig. 2 shows the parts arranged for greater spacing than is shown in Fig. l.

The forward-and-back position of the middle rolls 12 and 14 may be changed by adjusting the cross bar 23 forward or rearward by any suitable adjusting mechanism not shown herein.

It will further be noted that if the spacing between the front and back rolls is increased, the spring 52 acts on the lever 30 to greater mechanical advantage, and thus the relative pressure on the front top roll 11 is increased for wider roll spacing, which is a desired effect.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

l. A top roll weighting apparatus for a drawing frame comprising a compound saddle structure effective to apply pressure to a set of front and back top rolls, a main lever mounted to swing in a vertical plane about a fixed pivot intermediate its ends, a back link having a yieldable spring connection to the back end of said lever, means to pivotally connect said back link to the rear end of said saddle structure, and a detachable connection from the opposite and front end of said main lever to the front end of the saddle structure.

2. A top roll weighting apparatus as set forth in claim 1, in which means is provided to change the effective operating ratio of said main lever.

3. A top roll weighting apparatus as set forth in claim 1, in which means is provided to change the operative length of the saddle structure between the points at which pressure is applied thereto.

4. A top roll weighting apparatus as set forth in claim 1, in which the saddle structure comprises telescoping parts, one of which engages the back top roll and the other of which extends adjacent to and is associated with the front top roll.

5. A top roll weighting apparatus as set forth in claim 1, in which the saddle structure is connected to the back link by an intermediate release lever.

6. A top roll weighting apparatus as set forth in claim 1, in which a front link detachably connects the front and shorter end of said main lever to the front end of the saddle structure and is conveniently detachable therefrom.

7. A top roll weighting apparatus as set forth in claim 1, in which a middle top roll is provided and in which a saddle bar is pivotally mounted in said saddle structure and applies pressure to the front and middle top rolls when tension is applied to said saddle structure.

References Cited in the file of this patent UNITED STATES PATENTS

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