US2142597A

US2142597A - Rayon spinning pump

Info

Publication number: US2142597A
Application number: US105786A
Authority: US
Inventors: George M Allen; Henry J Mc-Dermott
Original assignee: American Viscose Corp
Current assignee: Akzo Nobel UK PLC
Priority date: 1936-10-15
Filing date: 1936-10-15
Publication date: 1939-01-03
Anticipated expiration: 1956-01-03
Also published as: DE697581C; FR827390A; GB481088A

Description

Jan; 3, 1939. e. M. ALLEN; ET AL 2,142,597

RAION SPINNING PUMP Fired on. 15, 1956.

INVENTORS scans: M. ALLEN HENRY J. McDERMOTT BY THEIR ATTORNEYS Patented Jan. 3, 1939 UNITED STATES RAYON SPINNING PUMP George M. Allen, Swarthmorc, and Henry J. Mc-

Dermott,

Prospect Park, Pa.,

assignors, by

mesne, assignments, to American Vbcosc Corporation, a corporation of Delaware Application October 15, 1936, Serial No. 105,786

6 Claims.

This invention relates to rayon spinning pumps, and more particularly pumps adapted to produce yarns of irregular denier, such for instance as the so-called thick and thin yarn. One object of the invention is to produce a pump which is simple in construction and operation and which will produce the variations in denier in a satisfactory manner at a reasonablyhigh speed. It is characteristic of yarns produced by this new spinning pump that they have portions of essentially normal denier and portions that are thicker, but none that are of appreciably less denier than normal.

In the drawing,

Fig, l is a side view in elevation of a rayon spinning pump constructed in accordance with my invention, certain parts being broken away;

Fig. 2 is a view in vertical section through the Dump in a plane parallel tothe front, taken on the line 2-2 of Fig. 1;

Fig. 3 is a. view in horizontal section looking down on the lower half of the portion of the regular part of the pump, taken on the line 3-3 f Fig.- 2;

Fig. 4 is a view in side elevation of the irregular toothed wheel which drives the plunger in the auxiliary chamber; while Fig. 5 is a view of a short piece of yarn of irregular denier such as can be produced by the pump;

One manner of producing the so-called thick and thin" yarn is by varying the pump delivery,

of which the patent to Henry Dreyfus etc al.

No. 1,996,796, dated April 9, 1935, is an example. It has been found desirable to rely on the regular pump for the supply of spinning solution for the portions of the yarn which are of normal thickness, and to keep this regular pump going uniformly, even when portionsof abnormal di.- ameter are being produced. It is absolutely essential that a'satisfactory device be very simple and that the path of travel of the spinning solution be shortened and simplified to the greatest possible extent. The piping leading up to the pump therefore has not been disturbed in any way and the extra solution necessary to make the thick portions of .yam is obtained at the inlet port of the regular pump. The extra solution is returned to the regular outlet port of the 60 regular pump. The auxiliary mechanism itself is fastened directly to the pump, with a minimum of piping and parts.

Referring now to the drawing, there is the usual pump it to deliver the uniform quantity so oi solution or regular supply of spinning solution. This may be of the gear type or of the rocking cam plate type. In the drawing we have shown this regular pump of the rock ng cam plate type, such as is shown in the patent to Charles F. Topham, 1,480,425, dated January 8, 1924. In this type of pump there is a cylindrical rotating body supported above a stationary cam plate i2. There are three pistons i3 mountedon the cam plate and passing through the rotatable body. As the rotatable body ll turns, the pistons, reciprocating longitudinally of the rotatable body in cooperation with certain semicircular passages l4, receive the spinning solution from the inlet port l5 and deliver it to the outlet port 5. These semi-circular passages l4 may be considered part of the inlet-and outlet ports. The rotatable body I I is turned by means of a spiral gear I1 and worm wheel l8 mounted on a shaft l9. This regular part of the pump is adapted to make the portions 20 of the yarn which are of normal diameter.

The means for producing'the extra supply of spinning solution when it is desired to produce slubs or portions of the yarn which are of greater diameter than normal, is mounted directly on the casing of the pump III. This means, which can be considered as an auxiliary pump, includes a casing or chamber 2| and a plunger 22. In addition to the main portion 22 of the plunger, there is a piston 23 on the end of the plunger and a ball bearing 24 between the. piston and the plunger. -The piston fits the inside of the chamber 2|. It is also guided in the chamber by means of a threaded top 25. The movements '35 of the plunger up and down inside the chamber are availed of to provide the necessary intermittent irregularsupply of additional spinning solution. There are two ball valves 26 and 21 which permit the spinning solution to move only in the direction of the outlet port I6. In order to carry the spinning solution from the inlet port IE to the inside of the chamber 2|, a passage 28 is bored in the casing of the regular pump i0 and in the chamber 2| to connect the lower end of the inside of the auxiliary pump with the inlet port. The ball valve 26 is seated at the end of this passage 28 at the bottom of the chamber and is held near its opening by a guard 29. It will be obvious that whenever the solution is being drawn into the chamber from the inlet portion IS, the ball valve 26 will rise against its guard 29 and permit the solution to enter the chamber. Whenever the plunger 22 is descending in order to force the spinning solution out of the chamher, the ball valve 26 will return to its seat and prevent the solution from returning through the passage 28 to the inlet port. When the piston is thus descending the spinning solution passes out through the lateral passage 30, past ball valve 21 and auxiliary port 3| into the semi-circular passage l4 and the outlet port is. The ball valve 21 is pressed upwardly by a compression spring 32 against a shoulder in one side of the lateral passage 30, so that except when the piston 22 is descending, the ball valve will cut off the chamber from the outlet port i6.

In order to keep the guard 29 in its proper position on top of the ball valve ,26 and in order that the piston may be operated properly, there is a compression spring 33 on top of the guard 29 extending upwardly and remaining at all times in contact with the bottom surface of the piston. This compression spring tends to push the piston and plunger upwardly at all times. The mechanism for limiting the upward movement or the plunger in response to the pressure of the compression spring 33, and the mechanism for giving the plunger downward and irregular, intermittent movements, will now be described.

The driving means for the regular pump ID are availed of to cause the movements of the plunger. The downward movements of the plunger are obtained from an irregular toothed wheel 34 shown in Fig. 4. The teeth on this wheel may be 01 varying height and may be spaced irregularly so that the time and extent of movement of the plunger may be made irregular in any desired manner. This irregular toothed wheel is mounted on the drive shaft l3 beside the worm wheel l3 and the two revolve together, turn for turn.

The mechanism for transmitting the indications of the irregular toothed wheel 34 to the plunger 22 is carried by a bracket 35 shown in Fig. 1. Mounted vertically in this bracket is a push rod 36, the lower end of which is adapted to engage the teeth and spaces on the periphery of the irregular toothed wheel. The upper end of this push rod engages the lower side of one arm of a rocker arm 31 pivoted on the bracket intermediate its ends. This rocker arm may be pivoted at any of say three pivot points 33. The purpose of this multiplicity of pivot points is to enable the stroke of the plungerto be varied in speed and magnitude. "The other end of the rocker arm overlies the upper end 33 01' the plunger 22. This upper end of the plunger is given a curvilinear surface for mechanical efliciency. Under the push rod end of the rocker arm is located a set screw 43 mounted in the bracket 35. This serves to limit the upward movement of the plunger 22 under the pressure of the compression spring 33. This set screw can be adjusted by means of a nut 4|. It will be obvious that by increasing the height of any tooth on the wheel 34, the degree or thickness of any given slub 42 can be increased, and that by changing the spacing of the teeth the spacing of the slubs can be changed. Thus it is seen that the fre-' quency of the slubs corresponds to the number of teeth on the wheel 34, and the shape and magnitude of the slubs to the shape and magnitude of the teeth. Thus the periphery of the wheel serves to determine the denier design and any desired design can be obta ned.

The construction of the pump having been set forth, its operation will now be described. The

spiral gear IT by its revolution revolves the shaft l3 and the worm wheel l8, together with the toothed wheel 34. The regular pump is caused to operate by rotation of its body ll, thereby causing delivery of the normal amount of spinning solution to the outlet port It. Simultaneously the rotation of the irregular toothed wheel 34 will cause intermittent and irregular upward movements or the push rod 33, which tipping the rocker arm 31, will depress the plunger 22, causing ejection of extra spinning solution from the chamber 2| through the lateral passage 30, past the ball valve 21, through the auxiliary outlet port 3|, into the passage i4 and the outlet port It. As soon as the push rod 36 passes oil a tooth on the wheel 34, the compression spring 33 will push the piston 23 and the plunger 22 upwardly until the rocker arm engages the set screw 40. This upward movement of the piston 23 and plunger 22 causes additional spinning solution to be drawn from the inlet port l5 into the chamber 2|. This cycle of operation is repeated intermittently and with varying extents of movement of the plunger to produce the various slubs 42 shown in Fig. 5.

In addition to the other advantages already mentioned, it will be noted that the spinning solution which is added to the normal supply has a very short path of travel while going through the auxiliary mechanism, and that the same is not diverted from its regular path at anypoint outside the regular pump. The simplicity and adjustability of the device will be obvious to all.

What we claim is:

1-. In a rayon spinning machine adapted to produce yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution,

said pump having inlet and outlet ports, in combination with means mounted on the pump for delivering a varying quantity of spinning solution to the outlet port, comprising a chamber connected to the inlet and outlet ports, valve means in the passages from and to said ports connecting to the chamber and permitting flow only toward the outlet port, a plunger in the chamber, a spring pressing the plunger in one direction, an adjustable stop limiting the movement of the plunger in the direction in which it is pressed by the spring, means adapted to give the plunger irregular movement against the pressure of the spring, and unitary means adapted to drive the pump and said irregular moving means.

2. In a rayon spinning machine adapted to produce yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution, said pump having inlet and outlet ports, in combination with means mounted on the pump for delivering a varying quantity of spinning solution to the outlet port, comprising a chamber connected to the inlet and outlet ports, valve meanslin the passages from and to said ports connecting to the chamber and permitting flow only toward the outlet port, a plunger in the peripheral contour into plunger movements in the opposite direction through the medium of said rocker arm, and unitary means adapted to drive the pump and said design wheel.

3. In a rayon spinning machine adapted to produce a yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution, said pump having inlet and outlet ports, an auxiliary pump for delivering a varying quantity of solution to the outlet port of the first named pump comprising a chamber connected to the inlet and outlet ports, valve means in the connection between said ports and said chamber permitting flow only toward the outlet port, a plunger in the chamber, means adapted to give the plunger rapid, intermittent, irregular movement in one direction to discharge solution through the outlet port, means for moving the plunger in the opposite direction, and means to drive both of the pumps.

4. In a rayon spinning machine adapted to produce a yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution, said pump having inlet and outlet ports, an

auxiliary pump for delivering a varying quantity 1 of solution to the outlet port of the first named pump comprising a chamber connected to the inlet and outlet ports, valve means in the connection between said port and said chamber permitting flow only toward the outlet port, a plunger in the chamber, means adapted to give the plunger rapid, intermittent, irregular movement in one direction to discharge solution through the outlet port, means for moving the plunger in the opposite direction, and unitary means to drive both of the pumps.

5. In a rayon spinning machine adapted to produce a yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution, said pump having inlet and outlet ports, an auxiliary pump for delivering a varying quantity of solution to the outlet port of the first named pump comprising a chamber connected 'to the inlet and outlet ports, valve means in the connection between said ports and said chamber permitting flow only toward the outlet port, a plunger in the chamber, means adapted to give the plunger rapid, intermittent, irregular move ment in ,one direction to discharge solution through the outlet port, comprising a rocker arm, one end of which acts against the plunger and cam means having an irregular, peripheral. contour for operating a pusher rod to give the plunger rapid, intermittent, irregular movement which acts against the other end, means for varying the discharge of the auxiliary pump, spring means for moving the plunger inthe opposite direction, and unitary means to drive both of the pumps.

6. In a rayon spinning machine adapted to produce a yarn of irregular denier, a pump adapted to deliver a uniform quantity of spinning solution, said pump having inlet and outlet ports, an auxiliary pump for delivering a varying quantity of solution to the outlet port of the first named pump comprising a chamber connected to-the inlet and outlet ports, spring-pressed ball valve means in the connection between said ports and said chamber permitting flow only toward the outlet port, a plunger in the chamber, means adapted to give the plunger rapid, intermittent;

irregular movement in one direction to discharge solution through the outlet port, means for moving the plunger in the opposite direction, and means to drive both of the pumps.

GEORGE M. ALLEN. HENRY J. MGDERHO'I'I.