US 3137452 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
June 16, 1964 wm s 3,137,452
MECHANISM FOR DELIVERING WIRE FROM A COIL THEREOF Filed Sept. 14, 1961 4 Sheets-Sheet 1 116-.1. v I d L 51 32 a ders June 16, 1964 R. F. WINDERS 3,137,452
MECHANISM FOR DELIVERING WIRE FROM A com THEREOF Filed Sept. 14, 1961 4 Sheets-Sheet 2 IN VENTOR 1701102"! I Winds-r TTORNEY June 16, 1964 R. F. WINDERS 3,137,452
MECHANISM FOR DELIVERING WIRE FROM A COIL THEREOF Filed Sept. 14, 1961 4 Sheets-Sheet 3 EOF June 16, 1 R. F. WINDERS MECHANISM FOR DELIVERING WIRE FROM ACOIL THEIR 4 Sheets-Sheet 4 Filed Sept. 14, 1961 uziosz @2210; ME;
R IN VENTOR ATTORNEY fia/aerZZ inders:
United States Patent 3,137,452 MECHANISM FOR DELIVERING WIRE FROM A COIL THEREOF Robert F. Winders, 4300 District Blvd, Los Angeles 58, Calif. Filed Sept. 14, 1961, Ser. No. 138,094 Claims. (Cl. 242--54) This invention relates to a mechanism for feeding wire from a coil thereof to a vw're forming machine.
An object of the invention is to provide a powered mechanism whereby wire may be fed from a rotating coil thereof and delivered to a wire forming machine wherein the speed of rotation of the coil and the feed of the wire therefrom will be automatically varied according to the demands of the wire forming machine and wherein rotation of the coil and feed of the wire therefrom will be automatically terminated in event of stopping of the wire forming machine, or in event of tangling of the wire being fed from the coil.
Another object is to provide a wire feeding mechanism of the above character which is especially advantageous for use in the delivery of wire from coils thereof wherein the initial weight of the coil is, for example, in the neighborhood of two thousand pounds, thus necessitating the effective application of forces in overcoming inertia in initiating movement of the coil and in overcoming momentum in arresting movement thereof.
With the foregoing object and advantage in view, together with such other objects and advantages as may subsequently appear, the invention resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed and illustrated by way of example in the accompanying drawings in which:
FIG. 1 is a diagram in plan depicting the mechanism as applied and in operation in effecting the feed of wire from a coil thereof to a wire forming machine;
FIG. 2 is a diagram in plan depicting in dotted lines the wire feeding mechanism with parts as disposed to automatically stop operation of the wire feeding mechanism;
FIG. 3 is an enlarged detail in section and elevation as seen on the line 33 of FIG. 2 in thedirection indicated by the arrows;
FIG. 4 is a detail in section and elevation taken on the line 44 of FIG. 2 as seen in the direction indicated by the arrows;
FIG. 5 is a schematic diagram of the brake and clutch elements of the wire feeding mechanism with their as sociated controls embodied in a wire forming machine;
FIG. 6 is an enlarged View of the portion of FIG. 1 indicated by the bracket 6;
FIG. 7 is a diagram in plan depicting a modification of the invention with portions removed; and
FIG. 8 is a detail in elevation of the wire supporting arm as seen on the line 88 of FIG. 1 in the direction indicated by the arrows.
I Referringto the, drawings more specifically A indicates a rotary table for supporting a coil B of wire C which coil is seated on the table and centered axially thereof by a multiple of. equispaced circularly arranged posts 10 nfiounted on the table A andabuttingthe inner periphery of t e coil.
The upper end portions of the posts 10 project a substantial distance above the upper face of the coil B to serve as guides to aid in directing the wire C into an enlarged convolution or loop C as it separates from the coil B and preliminary to its delivery to a wire forming machine D, the purpose of which will later appear. The table A is mounted on the upper end of an upstanding shaft, 11
revolubly supported by bearings 1212' on a fixed standard 13.
3,137,452 Patented June 16, 1964 Aflixed to the under side of the table A is an annular rail 14 arranged contiguous the perimeter of the table A concentric with the axis of the shaft 11. The rail 14 has its outer periphery engaged by a continuous flexible driving element 15, such as a sprocket chain, belt or cable, which passes around and is engaged by a driving wheel or pulley 16 on the upper end of an upstanding revoluble shaft 17. The shaft 17 is seated at its lower end on an end thrust bearing 18 and has its upper end portion revolubly guided in a bracket 19 projecting horizontally from an upstanding wall 20.
Loose on the shaft 17 is a pulley 21 engaged by a belt 22 which passes around and is engaged by a variable speed pulley 23 on the drive shaft 24 of an electric motor 25 mounted for horizontal swinging movement toward and away from the shaft 17. The motor 25 is here shown as rigidly mounted on an upright panel 26 erected at its lower end on a bracket 27 mounted to swing horizontally on a pivot 28. Projecting from the panel 26 and extending alongside the motor 25 is a plate 29 to which is connected the outer end of a pull spring 30 acting on the plate 29 and panel 26 to normally swing the motor 25 away from the shaft 17 to a retracted position wherein the variable speed pulley 23 is in its low speed driving condition.
Erected adjacent the plate 29 on the side thereof opposite the motor 25, is a vertically extending rock-shaft 31 on the upper end portion of which is fixed a long horizontal arm 32 the outer end portion of which extends contiguous the coil B on a plane slightly thereabove. The arm 32 functions as a directional support for wire C delivered from the coil B, as will be later described, and also serves as an actuator for turning the rock-shaft 31 in one direction under a pull imposed on the outer end of the arm 32 by the wire C supported thereon.
Means are provided whereby turning of the rock-shaft 31, under a pull imposed on the arm 32, will elfect swinging movement of the motor carrying panel 26 in opposi tion to the pull spring 30, which means comprises an arm 33 fixed on the shaft 31 having a roller 34 on its outer end seated against the outer face of the plate 29 so that inward movement of the arm 32 will be transmitted through the rock-shaft 31, arm 33, roller 34 and plate 29 to the panel 26. A pull spring 35 has one end thereof attached to the wall 20 and has its other end connected to a bracket 36 fixed on the rock-shaft 31, which spring acts through the rock-shaft 31 to normally maintain the arms 32 and 33 in their retracted position and to yieldably oppose advance movement of the arm 32 under the pull of the wire C, as will be later described.
Mounted on the outer end portion .of the arm 32 are two pair of direction rollers a-b and c-d around which the wire C is rove; the wire C leading from the coil B being passed successively around the direction rollers a-b on the arm 32 and then looped around the upstanding end portions of the posts 10 and then passed around the direction rollers c and d. The wire C leads from the roller d to the intake feed rollers 38 of the wire forming machine D as indicated in FIG. 1'.
Fixed on the shaft 17 adjacent the pulley 21 is a 'brake drum 37 and interposed between the pulley and brake drum are the members e-f of a friction clutch E of which the member e is aflixed to the upper side of the pulley 21 while the clutch member f is afiixed to the under side of the brake drum 37. The members e f of the clutch E are normally disposed in interengagement by a spring 38 encircling the shaft 17 and exterting an upward thrust against the underside 'of the pulley 21. As'here shown, the spring 38 seats atits lower end on, a ball bearing 39 abutting a bearing 40 supporting the shaft 17, and which spring bears indirectly at its upper end on a ball bearing 41 on which seats the underside of the pulley 21.
Interposed between the spring 33 and the bearing 41 is a yoke 42 constituting the lower end of an upstanding bellcrank lever F pivoted at 43 and adapted to be rocked to depress the spring 38 to thereby disengage the clutch E or to release the depressed spring to effect engagement of the clutch.
A brake shoe G is provided for engagement with the drum 37 to stop rotation of the shaft 17 and the table A driven therefrom. As here shown, the brake shoe G is fixed on a piston rod 44 fitted with a piston 45'arranged in a cylinder 46. The upper end 47 of the bell-crank F extends astride the piston rod 44 between the shoe G and a collar 48 on the piston rod 44 and normally acts under the thrust of the clutch spring 38 to retract the piston 45 and thereby dispose the brake shoe G out of engagement with the drum 37.
The brake shoe G is applied by directing fluid under pressure into the cylinder 46 behind the piston 45 under control of a valve H, the brake being designed to be applied simultaneously with release of the clutch E. The cylinder 46 is fitted with a fluid supply conduit 49 leading from the discharge side of the valve H which is here shown as embodying a housing 56 having an outlet port g with which the conduit 49 connects and having an intake port It with which connects a supply pipe 51 leading from any suitable source of fluid under pressure. The valve housing 59 is fitted with a valve cylinder 52 having a passage j adapted to be disposed in and out of communication with the ports g and h on turning the valve to its on and off positions. The valve H has an exhaust port k and the valve cylinder 52 is provided with a passage k adapted to be positioned to open the port k to the discharge port g whereby the cylinder 46 is opened to atmosphere and thus normally exhausted of fluid presusre and whereby the clutch E is normally engaged and the brake G normally released. The valve H is provided with an operating lever 53 acted on by a spring 54 normally positioning the valve cylinder 52 with the passage j closed to the ports g and h and with the exhaust port k opening the discharge port g to atmosphere as particularly shown in FIG. 5.
The wire forming machine D with which the wire feeding mechanism above described is associated, embodies a. normally engaged clutch J connecting a power driven pulley 57 with a driven shaft 58 actuating the wire forming mechanism in the machine D in a usual manner; the pulley 57 being driven by a belt 59 from a source of power (not shown). The clutch J is locked in its engaged position by a toggle lever 60 and is adapted to be released in the usual manner by the operation of a slide bar 67 attached to the toggle lever 69 by a lost motion connection K here shown as comprising a pin 69 on the toggle lever 60 engaged in an elongated slot 70 in the inner end portion of the slide bar 67 as particularly shown in FIG. 5.
The slide bar 67 is mounted for longitudinal movement on the housing 71 of the wire forming machine D and is advanced to its forwardmost position against the thrust of a spring 72 so as to advance the toggle lever 60 and thereby engage the clutch I and thus place the wire forming machine D in operation; the slide bar 67 being manually advanced through the medium of a hand hold 73 on the outer end thereof.
A spring urged pawl 74 is arranged to then engage a collar 75 fixed on the slide bar 67 to retain the latter in its forward position so that the clutch I will then be disposed in its engaged position. When the slide bar 67 is in its forward position the outer end of the slot 7d will be spaced from the pin 69 on the lever 63 to afford a lost motion clearance whereby initial outward movement of the slide bar 67 occasioned on release of the pawl 74- from the collar 75, will occur for a short distance before operatively disengaging the clutch lever 63, the purpose of which will appear hereinafter.
Means are provided for automatically disengaging the pawl 74 from the slide bar 67 which means embodies a normally open microswitch L controlling a solenoid mag- 29 and is adjusted thereon so that when the panel 26 is swung under the urge of the arm 32 when advanced to its forwardmost position, the stem will engage the switch arm 0 and close the switch L. The switch L normally remains open at all times except when closed as above stated and which occurs only when the arm 32 is moved to its extreme forward position.
The contact I on the switch arm 0 connects with an" electrical conductor s leading to one terminal of the solenoid M the other terminal of which connects with a I conductor t which with a conductor a connecting with the contact m on the'switch arm p leads to an outlet N of a source of electrical current supply in a usual manner.
Means are provided for automatically actuating the fluid pressure control valve H which means is controlled 7 by actuation of the slide bar 67 in placing the wire formopen microswitch Q adapted to be closed by movement' of the slide bar 67 under the urge of the spring 72. The switch Q embodies a pair of contacts v-w on a pair of normally retracted switch arms xy of which the switch arm x extends in front of a projection 77 on thetslide bar so that as the slide bar is retracted from its advanced clutch releasing position, the switch Q will be closed thereby. A conductor u leads from the conductor u to the switch contact w and a conductor z leads from the contact x to one terminal of the solenoid P the other terminal of which connects with the conductor 1 through a conductor t.
In the arrangement shown in FIG. 7, the valve H is controlled directly by movement of the slide bar 67, the projection 77 on the latter being disposed to engage the valve operating lever 53 to open the valve for the passage of fluid under pressure therethrough on retraction ofthe slide bar.
When the wire forming machine D is out of operation with the slide bar 67 retracted and switch Q closed, as shown in dotted lines in FIG. 1, the solenoid P will be energized and the valve I-I thereby held open so as to deliver fluid pressure into the cylinder 46 whereby the bellcrank lever F will be actuated so as to engagethe brake G and release the clutch E. Theparts of the wire feeding mechanism will then be brought to rest except as to. the motor 25 and the variable speed pulley 23, belt 22, and pulley 21 driven thereby.
In the operation of the invention, on the wire C being rove from the coil B around the direct-ion rollers L l-b,
posts 10 and direction roller c-d, in the order named, and
the leading end of the Wire engaged by the intake feed rollers 38 of the wire forming machine D, the machine D is set in operation by engaging the. clutch J, which is eflected by advancing the slide bar 67 from its initial retracted position indicated in dotted lines in FIGS. 1 and 5 to the advanced position shown in full lines in which positionthe slide bar spreads the toggle lever 60 so as to lock the clutch I in its engaged and driving position. The slide bar is then engaged by the pawl 74 and retained thereby in its ad vanced position in opposition to the spring 72. Forward taneously releasing the brake G and engaging the clutch El Coincident with initiating operation of the wire forming machine D, or shortly previous thereto, electrical current is directed from a suitable source of supply to the motor 25 as by closing a control switch in a usual manner, whereupon the motor 25 will act to drive the pulley 23, belt 22 and pulley 21 so as to rotate the shaft 17 through the then engaged clutch E. Rotation of the shaft 17 acts through the sprocket or pulley 16 and element 1 15 to drive the rotary table A and thereby rotate the coil B and efiect unwinding of the wire C therefrom.
A considerable length of the wire extends between the coil B and the wire intake rollers 38 of the wire forming machine D, which length in passing around the direction rollers a-b on the arm 32 followed by a loop thereof passing around the posts and then leading to the machine D around the rollers c-d assumes a large spiral configuration by reason of the inherent stiffness or resistance to bending pressure of the wire. Because of flexibility of the considerable length of the wire as a whole, such spiral arrangement is subject to fluctuation; the spiral formation permitting variation in the recited length of the wire as will be occasioned during operation by reason of the delivery of the Wire from the coil C being continuous while the intake into the wire forming machine is intermittent due to the frequent stopping of the wire delivered to the machine when severing the wire into formed lengths.
The wire C delivered from the coil B passes to the wire forming machine at a speed dependent upon the rate of consumption of the wire by the machine D which may vary between a minimum and a maximum. Such variation is reflected by variation in the pull of the wire imposed on the arm 32 by the wire intake mechanism 38 and resisted by the spring 35 and whereby the arm 32 will be caused to rapidly assume various positions within the range of its path of travel, which in normal operation will be confined to the outermost portion of such movement. When the pull on the arm 32 is at its minimum the arm 32 will be retracted by the spring 35 to near its outermost position so that the variable speed pulley 23 will then be positioned to drive the belt 22 and the rotary table A at slow speed, but on increase of such pull, the arm 32 will be advanced inwardly so as to dispose the variable speed pulley 23 in a position such as to drive the belt 22 and rotary table at a higher speed. It follows that while the motor 25 operates at a uniform speed of rotation, the rotary table and the wire coil thereon will vary in their speed of rotation according to the position of the arm 32 in its arc of travel.
In event, for any cause, the recited pull on the arm 32 be excessive, as by entanglement of the Wire C in the coil B the arm 32 will be automatically pulled fully inward by tension imposed on the wire by the feed 38 thereby causing the motor carrying panel 26 to swing under the pressure of the arm 33 thereby closing the switch L and energizing the solenoid M to thereby release the pawl 74 from engagement with the slide bar 67 so that the spring 72 will act to advance the slide bar to its off position thus disengaging the clutch J and stopping the machine D. Initial movement of the slide bar 67 will close the switch Q to thereby energize the solenoid P and actuate the valve H to thereby disengage the clutch E and simultaneously apply the brake G thus terminating movement of the rotary table A and stopping feed of the wire C from. the coil B.
When it is desired to terminate the operation of the wire forming machine D and the wire feeding mechanism, the pawl 74 is released by the operator and the slide bar allowed to move to its fully retracted position under the urge of the spring 72 so as to disengage the clutch J of the wire forming machine to stop the latter and also effect stopping of the rotary table A by disengaging the clutch E and setting the brake G.
The speed of rotation of the table A and the speed of rotation of the intake feed rollers 38 are so related to each other that the rollers 38 will intermittently feed into the wire forming machine in a given period a length of the wire C delivered by the rotating reel B on the table over such period. Such relative speeds are primarily determinedby regulation of the respective motors by which the wire working machine and the wire feed mechanism are operated.
During the operation of the wire delivering mechanism the speed of travel of the wire C leading from the coil B will vary relative to the speed of rotation of the table A by reason of variation in the radius of the coil at the point of departure of the wire from the coil, occasioned by the wire feeding from the coil at various points between the inner and outer perimeters thereof. This speed variation together with thatoccasioned by continuous delivery of the wire from the coil and intermittent feed of the wire to the wire forming machine is compensated for by the variable speed transmission afforded by the variable speed pulley 23 controlled by the pivoted wire supporting arm 32 as it is actuated to move forward on a pull being imparted thereto by the wire intake mechanism or feed rollers 38 of the wire forming machine in feeding the wire to the latter, which action accelerates rotation of the table and coil, and as the arm is actuated by the spring 35 to move rearward during the interval when the pull of the feed rollers 38 is relaxed to thereby dispose the pulley 23 so as to then decelerate rotation of the table and coil. This alternate acceleration and deceleration of speed of rotation of the table and reel occurs with a frequency dependent upon the length of time required to form a length of wire deliveredto the wire forming machine on each operation, which in some instances is quite rapid. During such acceleration and deceleration the loop C' will be alternately enlarged and diminished by the alternate elongation and shortening of the length of wire C,
extending between the coil B and the intake feed rollers 38 of the wire forming machine, the loop C' thus serving to compensate for such variations in wire lengths and obviating binding of the wire in its progress from the coil B to the wire forming machine.
While a specific embodiment of the invention has been shown and described, the invention is not limited to the exact details of construction set forth, and the invention embraces such changes, modifications and equivalents of the parts and their formation and arrangement as come within the purview of the appended claims.
1. The combination with a wire forming machine having wire intake mechanism adapted to engage and exert a pull on a wire delivered thereto, and embodying clutchoperating means controlling operation thereof, of a rotary table adjacent to but spaced from said wire forming machine for supporting a coil of wire thereon, a pivoted wire supporting arm arranged to swing adjacent said table opposite and in spaced relation to said intake mechanism, a plurality of direction rollers on said arm around which a length of wire leading from a coil thereof on said table is adapted to be rove with the leading end thereof directed from one of said rollers to said intake mechanism, an upstanding member on said table projecting above a coil of wire thereon adapted to have passed therearound the portion of wire leading over certain of said direction rollers for disposing said wire portion in a loop; a tensioned spring urging said arm outward in opposition to a pull exerted on the wire from said intake mechanism; means for rotating said table to unwind wire from the coil thereon embodying an upstanding rotary shaft, a driving connection between said rotary shaft and said rotary table, a pulley loose on said rotary shaft adapted to be engaged therewith, a belt passing around and engaging said pulley, a variable speed pulley engaged by said belt, a motor having a drive shaft on which said variable speed pulley is mounted, a pivoted panel on which said motor is carried for horizontal swinging movement, spring means connected to said panel normally retaining the panel, motor and variable speed pulley in a retracted position wherein said pulley drives the belt thereon at slow speed, means for swinging said panel in opposition to said spring under the thrust of forward movement of said arm to thereby vary the action of said variable speed pulley; means for stopping rotation oi said table embod ing a brake drum fixed on said rotary shaft and a normally engaged clutch connecting said brake drum and the pulley on said rotary shaft, means for simultaneously actuating said clutch and brake to disengage the clutch and apply the brake; and means operated by actuation of the clutch-operating means of the wire forming machine operatively connected to said clutch and brake operating means to actuate the latter.
2. In a machine for delivering wire from a coil thereof to a wire forming machine, a rotary table for supporting and turning a coil of wire to unwind wire therefrom, a motor, means for driving said table from said motor ernbodying a variable speed pulley mounted on said motor, a belt engaging said pulley, a clutch driven by said beit, a shaft on which said clutch is mounted, and a driving connection between said shaft and said table, a brake drum on said shaft embodied in said clutch, a brake engageable with said drum, and means for simultaneously disengaging said clutch and applying said brake to stop rotation of said shaft and table and also to alternately simultaneously engage said clutch and release said brake, a pivotal mounting for said motor, and means for swinging said mounting to actuate said variable speed pulley to vary the speed of rotation of said table.
3. In a machine for delivering wire from a coil thereof,
(a) a rotary reel supporting table,
(b) a revoluble shaft,
() a driving connection between said shaft and said table,
(d) a brake drum fixed on said shaft,
(e) a brake shoe engageable with said drum normally out of engagement therewith,
(f) a pulley loose on said shaft, normally inter-engaged clutch members interposed between and interconnecting said brake drum and pulley,
(g) powered variable speed transmission mechanism drivingly connected to said pulley;
(h) a speed control arm,
(2') yieldable means normally maintaining said arm in a retracted position,
(i) wire guides on said arm engaged by wire unwinding from a reel on said table whereby increasing tension on the wire will swing said arm to an advanced position in opposition to said yieldable means,
(k) means actuated by said arm adapted to condition said variable speed transmission mechanism to drive said pulley and table at slow speed when said arm is in its retracted position and to drive said pulley and table at increasing speeds as the arm moves toward its advanced position wherein said pulley andtable are rotated at a maximum high speed; and
(1) means actuated by movement of said arm into its fully advanced position to simultaneously disengage said clutch members and advance said brake shoe into engagement with said brake drum.
4. The structure called for in claim 3, in which said last named means comprises (a) a normally retracted fluid pressure actuated plunger connected to said brake shoe,
(b) means actuated by said arm on moving to its advanced position for delivering fluid pressure to advance said plunger andthereby engagesaid shoe with said brake drum, and
(0) means connected to said plunger adapted to disengage said clutch memberson advance of the plunger.
5. T he combination with a wire forming machine having wire intake mechanism adapted to engage and exert a pull on a wire delivered thereto, of a horizontal rotary table adjacent to but spaced from said wire forming machine for supporting a coil of wire thereon, powered mechanism connected to said table for rotating same to unwind wire from a coil thereon, a pivoted wire supporting arm arranged to swingadjacent said table near one side thereof and on a plane thereabove, said arm being spaced from said winding machine opposite said wire intake mechanism, a plurality of direction rollers on said arm around which a length of Wire leading from a coil thereof on said table is adapted to be rove with the leading end thereof directed from one of said rollers to said intake mechanism, a tensioned spring urging said arm outward in opposition to a pull exerted on the wire from said intake mechanism, a variable speed transmission in said powered mechanism, connections between said transmission and said arm controlling said powered mechanism by swinging movement of said arm to vary the speed of rotation of said table from minimum to maximum according to various positions of said arm as it is moved under the opposing pulls exerted thereon by the wire and a said spring; said arm and connections acting on said variable speed transmission to accelerate rotation of said table on movement of said arm under increasing pull imposed thereon by the wire, means for stopping rotation of said table controlled by movement of said arm under the pull of the wire to an advanced position contiguous that where said arm and connections condition said variable speed transmission to drive said table at a maximum high speed; said powered mechanism embodying a shaft, means for rotating said shaft, and means for driving said rotary table from said shaft; and in which said table stopping means embodies a normally engaged clutch in said shaft rotating means, a brake controlling rotation of said shaft through said clutch, and valve controlled fluid pressure means controlled by said arm for simultaneously dis engaging said clutch and applying said brake and also alternately engaging said clutch and releasing said brake.
References Cited in the file of this patent UNITED STATES PATENTS 1,834,993 Atwood Dec. 8, 1931; 2,175,551 Perry Oct. 10, 1939 2,271,049 Treckmann et al. Jan. 27, 1942 2,341,474 Orr Feb. 8, 1944 2,664,250 Friedman Dec. 29, 1953 2,777,643 Bancroft Ian. 15, 1957 2,946,536 Froelich July 26, 1960