US3149515A

US3149515A - Process for severing fed strands and subsequent handling thereof

Info

Publication number: US3149515A
Application number: US246083A
Authority: US
Inventors: Edwards Donald William
Original assignee: EI Du Pont de Nemours and Co
Current assignee: EIDP Inc
Priority date: 1962-12-20
Filing date: 1962-12-20
Publication date: 1964-09-22
Anticipated expiration: 1981-09-22

Description

Sept. 22, 1964 D. w. EDWARDS 3,149,515

PROCESS FOR SEVERING FED STRANDS AND SUBSEQUENT HANDLING THEREOF Filed Dec. 20, 1962 3 Sheets-Sheet 1 Se t. 22, 1964 D. w. EDWARDS 3,149,515

PROCESS FOR SEVERING FED STRANDS AND SUBSEQUENT HANDLING THEREOF Filed Dec. 20, 1962 3 Sheets-Sheet 2 Sept. 22, 1964 w EDWARDS 3,149,515

PROCESS FOR SEVERING FED STRANDS AND SUBSEQUENT HANDLING THEREOF Filed Dec. 20, 1962 5 Sheets-Sheet 3 United States Patent 3,149,515 PROCESS FOR SEVERENG FED STRANDS AND SUBSEQUENT HANDLING TEREOF Donald William Edwards, Wiimington, DeL, assignor to E. i. du Pont de Nemours and Company, Wilmington,

Del., a corporation of Delaware Filed Dec. 26, 1962, Ser. No. 246,083 3 Claims. (Cl. 8324) This invention relates to the handling of strands and, more particularly, to the processing of a plurality of strands advancing away from a continuously operating source.

The term strand, as used herein, is intended to include either a single filament, a gathered plurality of such filaments, or the threads, yarns, narrow webs, and the like produced from filaments or from staple fibers.

It is well known in the textile industry that a spinning process, wherein filament-forming material is extruded from a spinneret, is normally not stopped when a defective condition arises during the handling steps which follow extrusion. Such defects are usually encountered in the form of roll wraps, breaks, or similar defects which appear in the downstream handling of the strands. Rather than interrupt the spinning process, the practice is for the operator to cut down all the strands and then introduce them to a fluid actuated aspirator of the type shown by Miller in US. Patent No. 2,667,964. Since it is also customary in the art to have a single operator patrol a multiplicity of spinning positions, it is obvious that a defective condition may go unnoticed for a considerable period of time with resultant damage to the process equipment and a consequent interference with orderly operating procedures. An alternative practice has been to employ sensing devices which function to detect the various defects and to actuate cut-down or stop-motion equipment thereby interrupting the downstream delivery from a. given source. The extruded material is then permitted to accumulate on the floor beneath the spinning position until the operator has had a chance to remedy the sensed defect and restore the position to a normal operating condition. In such equipment, it is customary to provide a separate cutting device for each of the advancing strands.

The most important object of the present invention is to provide an improved process for cutting down and disposing of all the strands advancing from a spinning position upon occurrence of a defect in one or more of the strands.

A further object of this invention is to provide a process in which the cut-down device and aspirator are actuated simultaneously, either as an automatic or a manud response to an undesirable operating condition.

With these and other objects in view, the process of this invention involves the steps of gathering the strands into a bundle, moving the bundle laterally to a severing zone, severing the bundle and removing the severed, con tinuously advancing strands from the zone by suction.

Further advantages will become apparent in the following description wherein reference is made to the accompanying drawings in which:

FIGURE 1 is a plan view of automatic process equipment shown in conjunction with a plurality of advancing strands;

FIG. 2 is an elevational View of the equipment shown in FIG. 1, parts having been broken away and shown in section to reveal details of construction; and

FIGS. 3, 4 are plan views of alternate embodiments.

In FIGS. 1, 2, a cut-down apparatus has been illustrated which apparatus comprises generally a support 10, strand-severing means 12, a strand-gathering hook 14, an

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actuator 16 for moving the hook toward the severing means, an aspirator 18 for withdrawing severed strands and a condition responsive solenoid valve 20 by means of which actuator movement is initiated.

A pair of leads 22 couple solenoid valve 20 to a sensing device (not shown) in which an electrical circuit is closed upon the detection of an abnormal operating condition. Valve 20 admits air under pressure into one of the conduits 24, 26. Conduit 24 discharges into the actuator 16, which has been illustrated as a double-acting piston-cylinder assembly, through a flow control valve 28. Conduit 24 simultaneously feeds aspirator 18, which may be of the type disclosed by Miller, through branch conduit 30. Conduit 26 discharges into the other end of the assembly 16. Hook 14 is attached to the piston rod 32 by an irregularly shaped arm 34. Arm 34 is apertured to receive a pin 36 which extends through a coil intermediate the ends of hook 14 and through arm 34 into threaded engagement with a stud 38. Hook 14, which is of a suitable spring metal, has one end anchored in an opening 40 in arm 34. A plurality of strands, indicated by the numeral 42, is restrained by one or more fixed guides 44, so that strands 42 pass axially through the area swept by hook 14 in its translatory movement toward severing means 12.

The severing means 12 chosen for illustration is a plate type knife which includes a fixed plate 46 and a pivoted knife blade 48. Blade 48 is attached to plate 46 by a pin 50 and a nut 52 which acts on a spring washer 54. The pivoted blade 48 is biased to the open position by a coil spring 56 which has one end 58 anchored to blade 48 and its other end 60 in engagement with a pin 62 on plate 46. Blade 43 has an abutment 64 which is within the path of travel of stud 38 upon translatory movement of the arm 34 so that blade 48 is closed against the bias of spring 56 when a bundle of strands is delivered thereto by hook 14. For best results, the blades should be of tool steel and the cutting edges should be ground.

After the strands have been severed by blade 48, they are picked up by and aspirated through a tube 66 of aspiration 18 to a suitable waste collection point.

In operation, therefore, energization of solenoid valve 24 by the sensing device admits air under pressure to actuator 16 and the aspirat-or 18 through conduit 24. All of the strands 42, including those in which no defect has occurred, are gathered by hook 14 and delivered as a bundle to the severing zone from which the cut strands are withdrawn by aspirator 18. When the source of the defective strand condition has been remedied, the operator inactivates the sensing device by throwing a laming switch (not shown) which functions to hold Valve 20 in the deenergized position. After string-up and the like, the spinning position is placed in automatic operation by moving the laming switch to a position in which the sensing device is in a ready condition.

The embodiment of FIG. 3 is structurally and functionally similar to that shown in FIG. 1 except for the pivotal mounting of piston-cylinder assembly 16 and arm 34', the provision of link 71 and the omission of spring 56 (FIG. 2). Assembly 16' is pivoted to support 10' at 72 and to arm 34' at 73. Link 71 is pivoted to arm 34' at 74 and receives a pin 75 on pivoted blade 48' in a slot 7 6. When fluid pressure is applied to connection 24', the piston of assembly 16' swings arm 34' toward tube 66'. As gathered strands approach the tube inlet, the end of slot 76 engages pin 75 and pivots blade 48 to the cutting position.

Instead of an automatic actuator, the manually operable embodiment of FIG. 4 has an extension on arm 34" provided with an upstanding handle 80. Arm 34" is normally held against stop 82 by a spring 83 and is connected to blade 48 by a link 81 functionally identical to the link 71 (FIG. 3). The aspirator of tube 66" can be activated either manually or in response to movement of arm 34".

This application is a continuation-in-part of andclaims only the subject matter divided from my copending application Serial No. 827,901, now US. Patent No. 3,090,268, filed July 17, 1959. The process claimed herein has utility in conjunction with any equipment wherein one or more strands pass axially between two process points. Each illustrated embodiment may be employed, for example, in the cold drawing process disclosed by Sharp in US. Patent No. 2,851,732, in which instance the cut-down apparatusis installed at a location Where the bundle has been subdivided into smaller bundles.

It is apparent that many changes and modifications may be made'in the disclosed cut-down process without departing from the spirit of'the present invention which is accordingly intended to be limited only by the scope of the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

' 1. In the production of stranded material, the steps of: gathering a plurality of strands advancing axially from their sources into a bundle upon occurrence of a defective downstream process condition in one or more of the strands; moving the bundle laterally to a severing zone; severing the bundle; and removing the severed, continuously advancing strands from said zone.

2. In a process which requires the continuous advance of a plurality of strands away from a strand source, the steps of: gathering the strands into a bundle and moving the bundle laterally from the normal axial path of the strands to a severing zone responsive to a defective downstream process condition in one or more of the strands; severing the bundle; and removing the severed, continuously advancing strands from said zone.

3. An automatic process comprising the steps of: advancing a' plurality of strands away from a continuous production source; gathering the strands into a bundle responsive to a defective downstream condition in one or more strands; moving the bundle laterally from the normal path of advance to a cutting zone; cutting the bundle on its arrival in the zone; and removing the continuously advancing strands from the zone.

References Cited in the file of this patent UNITED STATES PATENTS 2,424,555 Curtis July 29, 1947

Claims

1. IN THE PRODUCTION OF STRANDED MATERIAL, THE STEPS OF: GATHERING A PLURALITY OF STRANDS ADVANCING AXIALLY FROM THEIR SOURCES INTO A BUNDLE UPON OCCURRENCE OF A DEFECTIVE DOWNSTREAM PROCESS CONDITION IN ONE OR MORE OF THE STRANDS; MOVING THE BUNDLE LATERALLY TO A SEVERING ZONE; SEVERING THE BUNDLE; AND REMOVING THE SEVERED, CONTINUOUSLY ADVANCING STRANDS FROM SAID ZONE.