WO1999040011A1 - Method and apparatus for controlling the tension of bead wire being pulled from a wire spool - Google Patents
Method and apparatus for controlling the tension of bead wire being pulled from a wire spool Download PDFInfo
- Publication number
- WO1999040011A1 WO1999040011A1 PCT/US1998/000075 US9800075W WO9940011A1 WO 1999040011 A1 WO1999040011 A1 WO 1999040011A1 US 9800075 W US9800075 W US 9800075W WO 9940011 A1 WO9940011 A1 WO 9940011A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire
- bead wire
- axle
- pressure
- brake
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/02—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package
- B65H59/04—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package by devices acting on package or support
Definitions
- the present invention relates to a method and apparatus for removing bead wire off from a wire spool with a bead making machine and more particularly to a method and apparatus for controlling the tension of the bead wire being fed off of the wire spool mounted in a bead wire letoff stand.
- the tire building industry has been improving the methods and apparatus for controlling the tension of a wire or wires being fed into a bead making machine used in the manufacture of tire beads.
- the current practice is to place a roll or spool of wire in a device, commonly called a bead wire letoff stand, that allows the wire to be pulled from the spool at a controlled tension over a wide range of spool speeds (line speeds) .
- the letoff stand must also be capable of stopping a full spool of wire at the maximum line speed.
- the control of the wire tension and the stopping of the rotating spool are typically accomplished with a braking device.
- the latter mentioned functions of the braking device must be accomplished without allowing the mass of the spool to overcome the braking force of the braking device. Failure to overcome the inertia of the rotating mass would result in the spool of wire continuing to unwind. If the wire continues to unwind from the spool while not being used in the bead making machine, the wire will typically jump off the wire guide pulleys and accumulate as a heap of wire next to the let off stand.
- a somewhat complex mechanical linkage includes a tension arm and linkage arms.
- a friction brake mechanically connected to the tension arm, can apply a braking force to the wire spool depending upon the location of the tension arm.
- the pivot points in the tension arm and the associated linkage arms are prone to wear. Once the mechanical parts begin to wear, the letoff stand cannot maintain control of the tension of the wire being unwound from the wire 2 spool and the stopping or slowing of the rotating wire spool as quickly and accurately as before the parts were at least somewhat worn.
- the mechanical linkage is adjustable by an operator so that the wire tension of the letoff stand can be held relatively constant irrespective of the mechanical wear.
- each of the letoff stands typically exerts a somewhat different tension on the wire being unwound, as compared with the tension of a different one of the letoff stands.
- This variation in feed tension effects the winding tension of the beads, causing the formed wire beads to vary in inside diameter by several thousandths of an inch. This can result in an adverse effect on the quality and uniformity of the tire beads.
- the tension varies enough to cause a problem known as "splitout," or uncontrolled separation of the bead ribbon in the bead making apparatus, causing expensive downtime of the assembly procedure while the wires are restrung.
- a tension responsive control arm engages the bead wire and moves in response to changes in bead wire tension.
- the control arm is operationally connected to the pressure regulator so that the braking pressure applied by the brake system to the wire spool is a function of the position of the control arm.
- the brake system has a first axle secured to and extending outward from the rotating wire spool, the first axle having a first centerline therethrough about which the spool rotates .
- a first gear wheel is attached to the first axle and a second axle being disposed in parallel relation to the first axle has a second gear wheel secured in engaging relationship with the first gear wheel.
- a pressure activated brake mechanism is provided to applying a braking force to the second axle in response to the receipt of pressurized air from the pressure regulator.
- a third axle is disposed in parallel relationship to the first and second axles.
- the third axle has the tension responsive control arm and a cam plate secured thereto whereby movement of the control arm causes rotational movement of the cam plate.
- the pressure regulator has a piston rod engaging a cam surface of the cam plate whereby rotational movement of the cam plate causes an actuator piston rod to regulate the air pressure delivered from the pressure regulator to the air pressure brake.
- a bias force application 4 device applies a biased force to urge the tension responsive control arm towards a position where the brake force is fully applied.
- the method of controlling the unwinding of bead wire from a rotating spool includes the steps of: applying a braking pressure to the rotating spool with a brake system; regulating the braking pressure applied by the brake system with a pressure regulator; and controlling the braking pressure applied by the brake system as a function of the position of a tension responsive control arm engaging the bead wire and pivotably moving in response to a change in tension of the bead wire.
- the method further includes the steps of: applying the braking pressure with a pressure activated brake mechanism that receives pressurized air from the pressure regulator to control the braking pressure applied by the brake system; pivoting the tension responsive control arm and a cam plate secured to cause rotational movement of the cam plate; engaging a cam surface of the cam plate with a piston rod extending from the pressure regulator whereby rotational movement of the cam plate causes an actuator piston rod to regulate the air pressure delivered from the pressure regulator to the pressure brake; and applying a force to urge the tension responsive control arm towards a position where the brake force is fully applied.
- Figure 1 is a side view of the bead wire letoff assembly of the present invention
- Figure 2 is a side view of the bead wire letoff assembly of Figure 1 with the side panel removed;
- Figure 3 is a top view of the bead letoff assembly shown in Figure 1;
- Figure 4 is a left side view of the bead letoff stand through line 4-4 of Figure 1;
- Figure 5 is a left side view through line 5-5 of Figure 1.
- Figure 1 shows a bead wire letoff stand 10 onto which a reel or spool (used interchangeably) of wire 12 can be rotatedly mounted.
- a reel or spool used interchangeably
- the wire spool 12 can be mounted in the stand 10 by means such as rolling the spool 12 across a mounting plate 14 fixedly secured to a base plate 16 of the stand 10.
- the side panels 17 of the stand 10 cover portions of the letoff mechanism and are provided to protect the operator.
- a large circular gear 18, an 80 teeth gear being typical thereof, is mounted onto a spool axle 20.
- the resulting axle and gear assembly 21 is slid into place through a center bore extending through the spool 12 so that the outer ends 20a, 20b of the spool axle 20 project outward from either side of the spool sides 12a and 12b, respectively.
- the gear 18 is bolted to threaded bore extension elements 26, which are solidly attached to and project outward from spool side 12a, with threaded pins 22.
- the gear 18 has a central collar section 18a through which the axle 20 extends and can be removably attached thereto.
- the gear 18 is disposed in spaced relationship to the side wall 12a of spool 12 and maintained in that position by any conventional manner, such as with spacers 25, disposed about removable pins 22 and between the sidewall and the gear. While the gear and axle can move in conjunction with each other, it is also within the terms of the present invention for the gear 18 and the axle 26 to be arranged so that the gear can rotate independently about the axle's center of rotation through the centerline 26 of spool 12.
- the outer end sections 20a and 20b of axle 20 are secured to a front and a rear support plate 29a and 29b, respectively, of the letoff stand 10.
- a circular gear 30 is mounted on an axle 32 which in turn is rotatably supported between two 6 pillow block bearings 34 and 36.
- a brake 38 is mounted.
- the brake 38 includes a circular friction pad 40, a circular metal braking plate 42 secured to the axle 32, and a fluid or air actuated piston member (not shown) connected to a pressure line 43 in the fluid or air actuator 44.
- the air actuator 44 in response to control pressure air received through air pressure line 43 from control pressure regulator 46, as shown in Figure 4, presses the friction pad 40 against the metal brake plate 42.
- the metal brake plate 42 is turned by the rotation of axle 32 whenever the spool 12 is rotating and is slowed or stopped by the pressure of the brake pad 40.
- the brake 38 can be secured to the wall 29a by the brake support base 41.
- This brake by the mechanism just described, applies a braking force to the axle 32 which slows down or controls its speed of rotation.
- the speed of rotation of circular gear 30 causes a correspondingly slow speed of rotation of gear 18 which is in meshing relation with gear 30.
- the speed of rotation of axle 20, which is secured to the wire spool 12 is reduced in relation to the pressure being outputted by control regulator 46, as shown in Figure 4.
- control regulator 46 outputs a control air pressure into line 43 that is proportional to the position of arm 56.
- An aspect of the present invention relates to the control system 48 for transmitting a force corresponding to the tension of the wire being unwound from spool 10 to one end of a control arm 56 which in turn regulates the control regulator 46.
- the control system 48 includes a rotatable pulley 50 that is rotatably secured on an axle 52.
- the control arm 56 is fixedly mounted at an opposite end to an axle 58 which is rotatably mounted through bushing 58a.
- axle 58 At the opposite end of axle 58, there is secured a cam plate 64, as best seen in Figures 2 and 4.
- the cam plate 64 will 7 also rotate about the axle so that the position of the cam surface 70 moves as discussed in more detail herein below.
- bias plate 72 having a central slot 74 extending therethrough, as shown in
- FIGS. 2 and 4. Along one side of the bias plate 72, there is formed a triangular shaped groove 76.
- the specific shape of the triangular groove 76 is not in and of itself an important feature of the present invention.
- the groove 76 does cooperate with a front triangular surface 78 of a block 80 having a cylindrical bore 82 and slidingly mounted on a tension rod 84.
- the tension rod 84 is pivotedly secured at one end 86 to an axle 88 secured by a bushing, not shown.
- a coiled spring 92 is disposed about the tension rod 84 and can extend from one end of the rod, near or at the axle 88, to a location in abutment with the block 80.
- the spring 92 produces a bias force that causes the triangular face 78 of the moveable block 80 to bear against the triangular groove 76 of the bias plate 72.
- the tension rod 84 extends through the slot 74 of the bias plate 72 so that the control arm 56 is free to move through an arc "x" of between about 40° and about 60°, and preferably at 45° to about 50° between two extreme positions.
- a bias force produced by the spring backed block 80 urges the control arm 56 towards a position closer to the location where wire 54 is being taken off or unwound from the wire spool 10.
- rod 84 can pivot about the axle 88 to accommodate the range of movement by the control arm 56.
- the control structure 93 can be formed of a plate 94 and rodlike structures 96a, 96b spaced from plate 94 and providing a passageway through which the control arm 56 can freely pivot between the selected end positions.
- the end positions can be set for each particular application by providing moveable end plates 98 and 100 which are adjustably attached by conventional means to the rod structures 96a, 96b, 8 respectively.
- the range of movement can be set by simply moving the end plates 98 and 100 closer or further from each other to achieve the movement arc of about 40° to about 60° and preferably about 45° to about 50°.
- FIG. 2 and 4 there is illustrated a letoff pulley 102 which is rotatedly mounted to a shaft 104 which in turn is secured to the wall 29a, as shown in Figures 4 and 5.
- the letoff pulley 102 while rotating, preferably remains at a fixed location on the axle 104.
- the pressure control regulator 46 is mounted onto a plate 112 which in turn is secured to the side 29a of the letoff stand 10.
- a reciprocating pin 114 projects out of the lower end of the pressure regulator 46 and is biased into contact with the cam surface 70 of cam 64 by a bias mechanism within the pressure regulator (not shown) .
- Movement of the pin 114 causes a change in the air pressure in line 43.
- the output air pressure from the air pressure control regulator 46 is transferred through the fluid actuator section 44 of brake 38.
- the brake 38 is activated by air.
- the rotation of cam plate 64 in response to the pivoting of control arm 56 causes the rod 114 to reciprocate within the pressure regulator to control the air pressure being delivered from the pressure regulator to the brake 38 through line 43.
- the wire spool is rolled into the bead wire letoff stand 10 and mounted by the ends 28a, 28b of the spool axle so that it is free to rotate about the center line 26 with gear 18 engaged with gear 30, as best shown in Figure 5.
- the bead wire 54 is threaded around the pulley 102, in a counter-clockwise direction as shown in Figure 2, and then around the pulley 50.
- gear 30 Since gear 30 is in meshing relation with gear 18, gear 18 slows down and then stops axle 20 and spool 12 from rotating. Then, as wire 54 is drawn from the pulley 50, pulley 50 moves in a clockwise direction, as shown in Figures 1 and 2, which in turn causes the control arm 56 to pivot about axle 58 in a clockwise direction toward the limit plate 100. This movement of control arm 56 is restrained by the bias of spring 92 pressing the block 80 against the bias plate 72. Concurrent with the pivotable movement of control arm 56, cam plate 64 rotates in the clockwise direction. The control regulator pin 114, which is in abutting engagement with the cam surface 70, moves closer to the axle 58 and causes the pressure regulator 46 to decrease the air pressure delivered through line 43 to brake 38.
- Pressure regulator 46 is adjusted so that the wire spool 12 rotates about axle 20 in a controlled manner corresponding to the tension force exerted by the wire on the pulley 50. As the control arm 56 pivots in the clockwise direction, the air pressure is reduced so that the speed of rotation of the wire spool 10 is increased.
- the control arm 56 moves quickly towards the position where the air pressure regulator 46 provides increased air pressure to the air brake 38 to immediately slow or stop the rotation of wire spool 10. In effect, the control arm 56 reaches a substantially equilibrium position between the limit plates 98 and 100 of the limit control structure 92 and 10 cycles back and forth slightly depending on the letoff speed and related tension of the wire 54. This enables increased line speeds of between about 400 fpm [121.92 mpm] and about 475 fpm [144.58 mpm] and preferably up to about 600 fpm [182.88 mpm].
- the braking force will be immediately applied to wire spool 12.
- the braking force will cause the rotation speed of the wire spool 12 to slow down or almost immediately stop to prevent the wire from continuing to spool off of the wire spool 12 and typically become tangled on the plant floor which is both wasteful and time consuming for an operator to rethread the wire onto the pulleys.
- the improved wire letoff assembly can accurately control full reels of wire at a line speed above about 500 fpm [152.4 mpm] and incorporates a cam plate operated in accordance with the location of a tension arm to control air pressure to an air brake that applies a braking force to the wire spool.
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- Tension Adjustment In Filamentary Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU66469/98A AU6646998A (en) | 1998-02-04 | 1998-02-04 | Method and apparatus for controlling the tension of bead wire being pulled from a wire spool |
PCT/US1998/000075 WO1999040011A1 (en) | 1998-02-04 | 1998-02-04 | Method and apparatus for controlling the tension of bead wire being pulled from a wire spool |
US09/555,436 US6457667B1 (en) | 1998-02-04 | 1998-02-04 | Method and apparatus for controlling the tension of wire being pulled from a wire spool on a bead wire letoff stand |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1998/000075 WO1999040011A1 (en) | 1998-02-04 | 1998-02-04 | Method and apparatus for controlling the tension of bead wire being pulled from a wire spool |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999040011A1 true WO1999040011A1 (en) | 1999-08-12 |
Family
ID=22266144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/000075 WO1999040011A1 (en) | 1998-02-04 | 1998-02-04 | Method and apparatus for controlling the tension of bead wire being pulled from a wire spool |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU6646998A (en) |
WO (1) | WO1999040011A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2877620A (en) * | 1956-10-08 | 1959-03-17 | Edmands Company | Wire twisting machine |
US3057578A (en) * | 1960-12-05 | 1962-10-09 | Dayton Tire & Rubber Company | Tension control device |
FR1361900A (en) * | 1963-01-31 | 1964-05-29 | Signaux Entr Electriques | Improvements made to unwinders, in particular for reels of wire or electric cables |
GB2020854A (en) * | 1978-04-25 | 1979-11-21 | Diosgyoeri Gepgyar | Tension Regulating Apparatus for a Stranding Machine |
-
1998
- 1998-02-04 AU AU66469/98A patent/AU6646998A/en not_active Abandoned
- 1998-02-04 WO PCT/US1998/000075 patent/WO1999040011A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2877620A (en) * | 1956-10-08 | 1959-03-17 | Edmands Company | Wire twisting machine |
US3057578A (en) * | 1960-12-05 | 1962-10-09 | Dayton Tire & Rubber Company | Tension control device |
FR1361900A (en) * | 1963-01-31 | 1964-05-29 | Signaux Entr Electriques | Improvements made to unwinders, in particular for reels of wire or electric cables |
GB2020854A (en) * | 1978-04-25 | 1979-11-21 | Diosgyoeri Gepgyar | Tension Regulating Apparatus for a Stranding Machine |
Also Published As
Publication number | Publication date |
---|---|
AU6646998A (en) | 1999-08-23 |
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