US2381856A - Drawing mechanism for spinning and roving frames - Google Patents

Description

Aug. 7', 1945.- J. RABASA 2,381,856

DRAWING MECHANISM FOR SPINNING AND ROVING FRAMES Filed June 25, 1942 E 35 II M111; -9

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w: I m 49 fl 634 d Patented Aug. 7, 1945 DRAWING IVIECHANISM FOR SPINNING AND ROVING FRAMES Joseph Rabasa, Biddetord, Maine, assinol to Saco-Lowell Shops, Boston, Mass, a corporation of Maine Application June 25, 1942, Serial No. 448,342

Claims.

This invention relates to spring weighting apparatus for the drawing mechanisms of spinning and roving frames.

It aims to devise a weighting mechanism which will be very simple in construction, will operate with a high degree of uniformity, will be convenient to install and to operate, will require a minimum of attention, and in which the springs can be replaced quickly with others of different characteristics when desired to suit the requirements of the material being run.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawing, and the novel features will be particularly pointed out in the appended claims.

In the drawing,

Figure 1 is a vertical, sectional view through a roller beam illustrating an apparatus constructed in accordance with this invention, some parts being shown in elevation; and I,

Figure 2 is a horizontal, sectional view approxi mately on the line 22, Figure 1.

Referring first to Fig. 1, a drawing mechanism of a common commercial type is there illustrated comprising front, middle and back bottom rolls 2, 3 and 4, respectively, and top rolls cooperating with them and indicated at 5, 6 and I. In this particular mechanism an apron 8 runs over the middle bottom roll 3 and the guide bar 9, and it is tensioned by an idle roll l0, but the invention is equally applicable to other forms of drawing mechanisms. The drawing rolls may be supported in the conventional manner in roll stands mounted on a roll stand beam I8. During the operation of the machine these rolls feed strands of sliver forwardly laterally of the beam and toward the forward edge of the latter.

The weighting mechanism for the top rolls comprises a. lever l2 fulcrumed at I4 on a screwthreaded stud or post I5, and the latter is equipped with nuts l6 and I! by means of which the post may be adjusted vertically in the roller beam l8. Bearing against the lower side of the lever I2 is a plunger 20 which is pressed upwardly by a compression spring 2| enclosed in a thimble 22. The spring bottoms on the lower inturned portion of the thimble, while at its upper end it supports the plunger head 20' consisting of a collar through which the plunger stem or rod extends loosely. This plunger rod has an upper section of large diameter and a lower section 24 of smaller diameter, with a shoulder at the junction of the two sections, and this shoulder rests on the collar 20'. Upward movement of the latter is limited by the thimble top or cover 23, the edges of which are crimped around the out-turned flange or head of the thimble. The plunger is guided partly by the walls of a central hole in the cover 23 and partly, also, by a hole in the bottom of the thimble. This spring and plunger unit or assembly is supported in a hole drilled for it in the roller beam I 8 with the head of the thimble resting on the upper surface of the beam, or on a beam plate 25 placed on said surface.

The force exerted on the lever by the spring pressed plunger is transmltted'to the upper drawing rolls by connections including a hook 28 en-v gaging a .pin 21 on the lever l2, 9. link or spreader 28 pivoted to said hook, and front and rear stirrups 29 and 30 pivoted to the opposite ends of said link. The front stirrup has a hook-shaped upper end resting on the reduced neck of the front roll 5, while the rear member 30 engages a depressed portion of a saddle 3| which bears on the necks of both the middle and back top rolls 6 and I. With this arrangement the load applied by the spring pressed plunger 20 to the lever I2 is multiplied several times, and it is properly distributed between the stirrups 29 and 30 by a' suitable spacing of the pivot pin 32 from the pivotal points of connection of the the link 28.

It should be observed that this team 1 stirrups 29 and 30. This fact is of advantage in a parts leave the shop. Consequently, the assem-. bler merely has to place the post IS in its proper position, give it a trial, adjustment forheight,

- drop the spring unit into its hole, and then he" manufacturing, handling andinstalling the parts In installing the apparatus on anew machine, the holes are accurately drilled in the roller beam for the postslS and the thimbles 22 before the connects'up the stirrup assemblywith the lever,

as shown in Fig. 1. Next he adjusts the vertical position of the'ful'crum by means of thenuts'll and'l'lv until the setting mark a on the plunger 20 is exactly flush with the upper-surface of the stirrups to formity is-carried through into the final assembly in the spinning frame by the adjustment of the parts to the Setting mark, as just described.

In assembling one of these weighting mechanisms on an old frame it probably will be necessary to drill one or more new holes by hand, in

which .event the beam. plate 25 is useful in covering the old holes and providing new properly sized and accurately located holes to receive the fulcrum post I5 and the pressure unit 22. This is particularly true because it is often difficult to drill the new holes by hand to exactly the right size and location, and the beam plate permits the drilling of these holes somewhat oversize and a little of! center while still permitting the proper location of the holes for the parts I5 and 22. One or more screws 33 can be used to secure this plate in its accurate position.

An important advantage of this mechanism is that when it is desired to release the weight on the top-rolls, it is merely necessary for the operator to press down on the forward end of the lever I2 with herhand, a very slight movement of this lever being sufficient to permit her to un-- hook the load member 26, after which the stirrup 29 or the saddle 3|, or both, can be removed, as desired. This arrangement makes the operation of unloading the rolls or unhooking the weighting mechanism exceptionally easy and convenient to perform. Subsequently, in re-applying the weight, the stirrup assembly first is restored to its original position, but the lever I2 at this time is tilted upwardly. Due to the fact that the upper end of the load hook 25 is square and is spaced only slightly from the web of the channelshaped link 28, only a very limited swinging movement of this hook relatively to the link is permitted so that its lower end at this time will lie just above the position occupied by the pin or roll 21. Upon forcing the lever I2 down toward its normal position, as shown in Fig. 1, the pin 21 should strike the lower end of the hook at about the point b and upon further upward movement of this pin it will tip the part 25 slightly to the right and the hook of the latter finally will drop to the left under the pin 21 as the lever comes down to its correct position. This materially reduces the labor involved in hooking up the weighting mechanisms in the entire line of rolls of a long spinning or roving frame.

'I'heconstruction just described is of further advantage in preventing the hook 26 from swinging too far out of its normal relationship to the link 28 at any time. For the same reason the stirrup 25 is provided with a nose piece or projection 34 to engage the web of the channel-shaped link 28 and limit the swinging movement of the former in a counter-clockwise direction.

An alternative and somewhat quicker and simpler method of releasing the weight from all the top rolls is by simply pressing down on the forward or handle end of the lever I2 with one hand and unhooking the front top roll hook 29 from the top roll 5 with the other hand. The weight can be reapplied to all the rolls by again pressing down on the lever and rehooking the front which is particularly noticeable when slubs or bunches run between the rolls.

A further and important advantage of this mechanism is that the spring plunger units can 5" be quickly replaced with others having lighter or heavier springs whenever'a large change in weighting is required because of the nature of the work being run. Such replacement merely involves the unhooking of the front top roll hook 29 as previously described and the tipping of the lever I2 in a clockwise direction far enough to permit the removal of the spring unit 22 and the introduction of a different one in its place, the

v latter having the desired pressure characteristies. In making this substitution the plunger rod 20, 24 can be removed from the old spring unit and replaced in the new one.

At the right-hand end of the lever I2 a pin or rivet 35 extends from one channel side to the other where it is useful in locking the load hook 26 in a different relationship to the lever, when desired, as in the hand operation of the lever.

While I have herein shown and described a preferred embodiment of my invention, it will be evident that the invention may be embodied in other forms without departing from the spirit or scope thereof.

Also, because the invention is equally applicable to spinning and. roving frames, both will be herein 30 included in the term "spinning frames.

Having thus described my invention, what I desire to claim as new is:

1. A weighting mechanism for one or more of the top rolls of a drawing mechanism for a spinning frame provided with a horizontal roll stand beam and including a sets of rolls above said beam for feeding strands of sliver forwardly toward the front of said beam, comprising a lever fulcrumed on the rearward portion of said beam and extending forward above said beam to a convenient operating position at the front thereof below the front rolls, connections running from the rearward portion of said lever to one or more of said top rolls to weight the latter, the forward end portion of said lever forming a handle, and a spring unit positioned in said beam near the forward side thereof and acting on said lever to tension said connections.

2. A weighting mechanism according to preceding claim 1, in which said spring unit includes a thimble, a spring housed therein and a plunger operated by the spring, said unit being supported in arr-aperture in said beam for removal therefrom at the upper side of the beam and said plunger being positioned to bear on the lower side of said lever at a point in front of said fulcrum.

3. A weighting mechanism according to preceding claim 1, in which said spring unit includes a thimble removably supported in an aperture in said beam and provided with a head resting on the upper surface of said beam, a compression spring in said thimble, and a plunger on which said spring acts, said plunger having 55 portions extending through both the top and the bottomof the thimble and guided therein.

4. A weighting mechanism according to preceding claim 1, in which said lever is mounted on an adjustable fulcrum supported in said beam.

5. A weighting mechanism according to preceding claim 1, in which a screw-threaded bolt is pivotally connected with said lever and serves as a fulcrum support for the latter, said bolt projecting throughan aperture in said beam, and

nuts threaded thereon above and below the beam to support it for vertical adjustment relatively to the beam.

6. A weighting mechanism for one or more of the top rolls of a drawing mechanism for a spinning frame provided with a horizontal roll stand beam and including a set of rolls above said beam for feeding strands of sliver forwardly toward the front of said beam, comprising a lever fulcrumed on the rearward portion of said beam and extending forward above said beam to a convenient operating position at the front thereof below the front rolls; the forward end portion of said lever forming a handle, connections running from said lever to a plurality of said top rolls for weighting. the latter; said connections including two stirrups, a link connecting the lower ends of said stirrups above said beam, a weight hook pivoted to said link and releasably connected with said lever; and a spring acting on said lever in a direction to tension said weight hook and said stirrups.

7. A weighting mechanism for one or more of the top rolls of a drawing mechanism for a spinning frame provided with a horizontal. roll stand beam and including a set of rolls above said ward the front of said beam, comprising a lever fulcrumed on said beam and extending forward above said beam to a convenient operating position at the front thereof below the front rolls; the

forward end portion of said lever forming a handle, connections running from said lever to a plurality of said top rolls for weighting the latter; said connections including two stirrups, a link connecting the lower ends of said stirrups, and

a weight hook pivoted to said link and releasably connected with said lever; said stirrups, link and acting on said lever in a direction to tension said weight hook and said stirrups.

8. A weighting mechanism according to preceding claim 1, in which said spring unit includes a thimble removably supported in an aperture in said beam and provided with a head resting on the upper surface of said beam, a compression spring in said thimble, and a plunger on which said spring acts, said plunger having portions extending through both the top and the bottom of the thimble and guided therein, in combination with a plate mounted on said beam and apertured to position both said spring unit and the fulcrum for said lever.

9. A weighting mechanism for one or more of the top rolls of a drawing mechanism for a spinning frame provided with a horizontal roll stand beam and including a set of rolls above said beam for feeding strands of sliver forwardly toward the front of said beam, comprising a lever fulcrumed on said beam and extending forward from the rearward portion thereof across the top of the beam to a convenient operating position at the front thereof, the forward end portion of said lever being free and forming a handle positioned at the front of the beam below the front rolls of said set and spaced both from said rolls and also from said beam, weighting connections extending from said lever to one or more of the top rolls of said set, and a spring acting on said lever in a direction to cause it to tension said connections, whereby the weighting force can be relieved by operating the forward end of said lever.

10. A weighting mechanism according to preceding claim '7, in which said weight hook is so inclined that when unhooked from said lever it is held by gravity in position to be rehooked automatically merely by returning the lever to its normal position, said lever and said hook having parts cooperating to produce this result.

JOSEPH RABASA.

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