CA1260805A - Wire forming apparatus - Google Patents
Wire forming apparatusInfo
- Publication number
- CA1260805A CA1260805A CA000465158A CA465158A CA1260805A CA 1260805 A CA1260805 A CA 1260805A CA 000465158 A CA000465158 A CA 000465158A CA 465158 A CA465158 A CA 465158A CA 1260805 A CA1260805 A CA 1260805A
- Authority
- CA
- Canada
- Prior art keywords
- wire
- dies
- die
- rotation
- coils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/04—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with spring inlays
- A47C27/06—Spring inlays
- A47C27/065—Spring inlays of special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/12—Coiling wire into particular forms of interconnected helical springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
Abstract
ABSTRACT
Wire forming apparatus has a pair of rotary dies movable together and apart on a rectilinear path.
The dies are adapted to hold a length of wire at opposite ends thereof such that on contra-rotation the dies approach each other while deforming said ends into coils.
Wire forming apparatus has a pair of rotary dies movable together and apart on a rectilinear path.
The dies are adapted to hold a length of wire at opposite ends thereof such that on contra-rotation the dies approach each other while deforming said ends into coils.
Description
~ 5 This lnvention relates to wire forming apparatus.
Recently the need has arisen to manufacture double springs as disclosed, for example, in our European Patent Appli-cation No. 83 303419 . 2 which relates to a box spring assembly comprising a plurality of deck elements each formed from a single length of wire having an elongate central section terminating ln curved sections extending at least in some elements into spring legs.
It is an ob~ect of the present invention to provlde wlre forming apparatus capable of formlng the opposite ends of a length of wire lnto respective coil formatlons.
According to the present inventlon there is provided wire forming apparatus comprlslng a pair of rotary dies movable together and apart on a rectilinear path and adapted to hold a length of wire at opposite ends thereof such that on contra-rota-tion the dies approach each other while deforming said ends into coils, wherein means is provided for contlnuously moving a cen-tral section of the wire in a direction parallel to the axes of rotation of the dies during approach movement of the dies so as to control the angle of lnclinatlon of the wlre ad~acent the dies with respect to the axes of rotation thereof, thereb~ lmparting a desired pitch and height to said coils.
In a partlcular preferred embodiment of the present invention liftlng means is provided for lifting a central section of the wire during approach movement of the dies so as to impart a desired pitch and height to said coils. '3uitably said lifting means comprises fixed stroke drive means connected to a first lifting member carrying a second lifting member which is ad~ustable with respect to the first lifting member in the lift-ing direction so a~, to vary the inclination of the wire ad~acent the dies, and therelby said pitch. Desirably said dies have respective detents for restraining upward movement of said wire I
. . .
,. ...
. .
~ ()'a under the ln1uence of sald lifting means. Suitably each dle has two pro~ectlons whlch are radially and angularly spaced wlth respect to the axls of rotatlon so as to engage the wlre from opposite sides thereof and impart a bending force thereto on rotation of the die. Desirably the connection of the radially outer pro;ection to the body of the dle provldes a support for the wire at the start of the colling operation.
In a further embodiment of the present inventlon the dies are cylindrical in order to form spiral coils. Suitably each die is driven by a respective drive motor and chain trans-mission, the two motors being mounted for plvotal movement about a common axis under the lnfluence in each case of a rigid con-necting arm plvotally ~oined to the motor and the dle. Deslrably the apparatus fllrther comprises means for automatically returning the dies to the:Lr startlng posltlon after removal of a finlshed wlre. Suitably feed means is provided for feeding successive lengths of wires to the dies, said feed means comprising hopper means for receiving a supply of said wire length, inclined chute means for feeding a single layer stream of said lengths from the hopper towards the dles, and separatlng means for separatlng the leadlngl:Length of wlre from sald stream for dellvery to sald dies.
The invention will now be further described by way of example only, with reference to the accompanying drawings, in which:-Fig. 1 and the lnsets a t:o e show one embodiment of wire formlng apparatus according to the invention and details of parts thereof ~ - la -B
., ~. .
. . .
~ )8()5 lndicated by the arrow~;
Fig. 2 show~q part of the embodl~ent of Fig. 1 in greater detail;
Fig. 3 i~3 a front elevation of the apparatus showlng only the bending dies and a wire sectlon about to be defor~ed thereby;
Flg. 4 i8 a plan vlew corresponding to Fig. 3, and Flgs. 5a-e ~how dlf~erent ~tageB in the bending operatlon.
The wire formlng apparatu~q compriqeq a frame 1 supporting a wire feeder 2 for advancing wire rod ~ectlons ~ to a deformlng mechanism 4. Aq shown ln Flg. 1 and inqet 1c, the wire feeder 2 ha~ two horlzontally spaced guldes 5, 6 flanked by lateral wallq 7, 8. The guide 5 has an upper gulde strip 9 spacedly~ arranged above a lower guide strip 10. The reer ends of the two guide strlps 9, 10 are turned upwardly and wldely spaced to define a hopper formation 11. In front of the hopper formation 11 the guide strips 9, 10 define a chute 12 having a width only sllghtly greater than the t;hlcknes~ of the wire ~ectionq 3. The front end of the chute 12 18 closed by a ramp 13 extsndlng to the deforring mechanism 4. The upper guide strip 9 ends short of the ra~p 'l3 to leave a slot 14 through ~hlch the leadlng wire~section 3 c~n be e~ected by an cJector ~.
.
'~
~ ~ ~0 ~ 5 (not shown) slidable in a bore 15.
The guide 6 18 con~tructed in the same way a~
the gulde 5 and corresponding parts sre designated by the sa~e numerals with suffl~ a. In use, ~
supply of wire sections 3 18 loaded into the hopper ~ormations 11, 11a. The a~ial po~ition o~ the wire ~ections ~ i8 de~ined by the lateral walls 7, 8. A ~ingle layer o~ wire section~ ~ roll~
down the chutes 12, 12a under the in~luence of gravlty, The leading section 3 i8 lifted onto the ramps 13, 13a by the eJectors and rolls into a defined location on the deforming mechanism 4. The general feed direction of the wire sections ~ i~
indicated by the arrow A.
The functlon of the de~orming mechanlsm 4 is to bend ~ straight wire section 3 as shown ln Flg.
5_ into the partly completed double spring shown ln Fig. 5d. This involves bending the wlre in both horizontal and vertlcal direction~. Horizontal bendlng i8 achleved b~lthe mechanlsm at the front of the frame 1. This comprises carriages 16, 17 slidable together in the directions of arrows B, C
on parallel rail~ 18, 19. Synchronised move~ent of the c~rriages is achieved by a chain 20 to whlch each carrlage 18 fl~ed at the points marked ln Fig.
Recently the need has arisen to manufacture double springs as disclosed, for example, in our European Patent Appli-cation No. 83 303419 . 2 which relates to a box spring assembly comprising a plurality of deck elements each formed from a single length of wire having an elongate central section terminating ln curved sections extending at least in some elements into spring legs.
It is an ob~ect of the present invention to provlde wlre forming apparatus capable of formlng the opposite ends of a length of wire lnto respective coil formatlons.
According to the present inventlon there is provided wire forming apparatus comprlslng a pair of rotary dies movable together and apart on a rectilinear path and adapted to hold a length of wire at opposite ends thereof such that on contra-rota-tion the dies approach each other while deforming said ends into coils, wherein means is provided for contlnuously moving a cen-tral section of the wire in a direction parallel to the axes of rotation of the dies during approach movement of the dies so as to control the angle of lnclinatlon of the wlre ad~acent the dies with respect to the axes of rotation thereof, thereb~ lmparting a desired pitch and height to said coils.
In a partlcular preferred embodiment of the present invention liftlng means is provided for lifting a central section of the wire during approach movement of the dies so as to impart a desired pitch and height to said coils. '3uitably said lifting means comprises fixed stroke drive means connected to a first lifting member carrying a second lifting member which is ad~ustable with respect to the first lifting member in the lift-ing direction so a~, to vary the inclination of the wire ad~acent the dies, and therelby said pitch. Desirably said dies have respective detents for restraining upward movement of said wire I
. . .
,. ...
. .
~ ()'a under the ln1uence of sald lifting means. Suitably each dle has two pro~ectlons whlch are radially and angularly spaced wlth respect to the axls of rotatlon so as to engage the wlre from opposite sides thereof and impart a bending force thereto on rotation of the die. Desirably the connection of the radially outer pro;ection to the body of the dle provldes a support for the wire at the start of the colling operation.
In a further embodiment of the present inventlon the dies are cylindrical in order to form spiral coils. Suitably each die is driven by a respective drive motor and chain trans-mission, the two motors being mounted for plvotal movement about a common axis under the lnfluence in each case of a rigid con-necting arm plvotally ~oined to the motor and the dle. Deslrably the apparatus fllrther comprises means for automatically returning the dies to the:Lr startlng posltlon after removal of a finlshed wlre. Suitably feed means is provided for feeding successive lengths of wires to the dies, said feed means comprising hopper means for receiving a supply of said wire length, inclined chute means for feeding a single layer stream of said lengths from the hopper towards the dles, and separatlng means for separatlng the leadlngl:Length of wlre from sald stream for dellvery to sald dies.
The invention will now be further described by way of example only, with reference to the accompanying drawings, in which:-Fig. 1 and the lnsets a t:o e show one embodiment of wire formlng apparatus according to the invention and details of parts thereof ~ - la -B
., ~. .
. . .
~ )8()5 lndicated by the arrow~;
Fig. 2 show~q part of the embodl~ent of Fig. 1 in greater detail;
Fig. 3 i~3 a front elevation of the apparatus showlng only the bending dies and a wire sectlon about to be defor~ed thereby;
Flg. 4 i8 a plan vlew corresponding to Fig. 3, and Flgs. 5a-e ~how dlf~erent ~tageB in the bending operatlon.
The wire formlng apparatu~q compriqeq a frame 1 supporting a wire feeder 2 for advancing wire rod ~ectlons ~ to a deformlng mechanism 4. Aq shown ln Flg. 1 and inqet 1c, the wire feeder 2 ha~ two horlzontally spaced guldes 5, 6 flanked by lateral wallq 7, 8. The guide 5 has an upper gulde strip 9 spacedly~ arranged above a lower guide strip 10. The reer ends of the two guide strlps 9, 10 are turned upwardly and wldely spaced to define a hopper formation 11. In front of the hopper formation 11 the guide strips 9, 10 define a chute 12 having a width only sllghtly greater than the t;hlcknes~ of the wire ~ectionq 3. The front end of the chute 12 18 closed by a ramp 13 extsndlng to the deforring mechanism 4. The upper guide strip 9 ends short of the ra~p 'l3 to leave a slot 14 through ~hlch the leadlng wire~section 3 c~n be e~ected by an cJector ~.
.
'~
~ ~ ~0 ~ 5 (not shown) slidable in a bore 15.
The guide 6 18 con~tructed in the same way a~
the gulde 5 and corresponding parts sre designated by the sa~e numerals with suffl~ a. In use, ~
supply of wire sections 3 18 loaded into the hopper ~ormations 11, 11a. The a~ial po~ition o~ the wire ~ections ~ i8 de~ined by the lateral walls 7, 8. A ~ingle layer o~ wire section~ ~ roll~
down the chutes 12, 12a under the in~luence of gravlty, The leading section 3 i8 lifted onto the ramps 13, 13a by the eJectors and rolls into a defined location on the deforming mechanism 4. The general feed direction of the wire sections ~ i~
indicated by the arrow A.
The functlon of the de~orming mechanlsm 4 is to bend ~ straight wire section 3 as shown ln Flg.
5_ into the partly completed double spring shown ln Fig. 5d. This involves bending the wlre in both horizontal and vertlcal direction~. Horizontal bendlng i8 achleved b~lthe mechanlsm at the front of the frame 1. This comprises carriages 16, 17 slidable together in the directions of arrows B, C
on parallel rail~ 18, 19. Synchronised move~ent of the c~rriages is achieved by a chain 20 to whlch each carrlage 18 fl~ed at the points marked ln Fig.
2. Tho chaln. 20 runs on sprocket~ 21, 22 on sha~ts 2~, 24. The ~hs~t 24 18 extendLed rearwardly ~8 8(~5 ~hown ln Flg. 1b and 2 to recelve a ~urther sprocket 25 which i8 engaged by a ch~ln 26 one end of whlch ls anchored to a frame member vi~ a coll sprlng 27 ~nd the other end of which is fixed to the plunger 28 of a iluld pres~ure operated ra~ member 29. When the carrlages 16, 17 move together the chain 20 cau~es rotation o~ the sha~t 24 and hence the sprock-et 25 thus li~tlng the plunger 28 via the chaln 26, the slack belng absorbed by the spring 27. In order to move the carriages 16, 17 apart the ram member 29 i8 actuated to retract the plunger 28 thereby reverslng the rotation o~ the shaft 24 and the directlon of travel of the chain 26. Alternatlvely, thle chaln 26, spring 27 and ram 29 may be replaced by a weight which is suspended from the shaft 24 ~o a~
to be li~ted when the carriage~ 16, 17 move together.
W~len the formed wire section i8 removed ~rom the dles the weight falls to move the carriages apart.
Each carrlage 16, 17 mounts a generally cylindrical steel dle/30, 31 rotatable about a vertlcal axis. Since both dles and t;heir drive mechanisms are similarly constructed only the die 30 and its associated drive mechanism will be described, the correspondlng parts ol~ the other Z5 die 31 and 'Lts drive mechanism being designated by the Isame reference numeralls with the ~uffl~ a.
The die ~0 has a drive Ishaft 32 which e~tends .~ .
' '~
OS
downwardly from the carriage 17 through a bearing support 33 and termlnates in a drive ~procket 34 (Fig. 1d). A drlve chaln 35 connects the sprocket 34 with a drlve ~procket 36 on the output ~haft of an electrlc drive motor 37 whlch is mounted on a carrler 38 pivotal about a vertlcal axis ~9 common to the other carrier 38a of the motor ~7a (Fig. 1e), The distance between the driLve ~proc~cets 34, 36 is flxed by a telescopically adJustable bar 40. This arrangemerlt of pivotally mounted motor and rigid interconnection between the drive sprockets enables the drive sprockets 34, 34a to travel on a rectilin-ear path whlle pivoting about the other drlve sprockets 36, 36a which are them~elves caused to pivot about the common axis 39 as indicated by the arrows in Fig. 1 e.
The upper ends of the drive shafts 32, 32a are fixed to the dies 30, 31. As already mentioned, only the die 30 will be described, corresponding parts on the other die, 31 being designated by the same reference numerals with the ~uffix a. The die 30 has a cylindrical body 41 with a fIusto-conical upper end 42. At the lower end of the die 30 are two radially and circumIerentially spaced pillars 43, 44. The pll]Ler 43 ls spaced ~rom the body 41 on a radlally pro,~ectlng plat~or~ 4!5 nnd the longer plllar 44 18 wolded dlrectly to the body 41. The A
.' , ,: "' , O8(~5 6.
axes of the pillars 43, 44 are parallel to the a~cis of rotatlon of the die 30. At the oppo~lte ~lde of the pillar 44 from the pillar 43 a cylindrlcal stop 46 proJects from the body 41 at a level between the upper ends of' the two plllars 43, 44. The stop 46 i8 ilxed in a radial bore 47 in the die body 41 by means of a clamping ~crew 48 in a side bore 49.
Vertical bending o~ the wire i~ achieved by the ~echanlsm ~hown ln inset 1a but omitted from Flg. 1 for the sake of clarity. It compri6es a double-acting cylinder 50 arranged to plvot an H-frame 51 about a fixed member 52. Mounted on the H-frame 51 with ad~ustable spacing therefrom ls a fork 53. Wire engaging pro~ectlon~ 54, 55 extend ~rom t,he front ends of the side members of the H-frame 51 and the fork 53 has slmilar pro~ect-ion~ 56~ 57 in the same vertlc al pl~e as the pro~ections 54, 55.
A wire section 3 fed to the deforming mechanism 4 rolls down the ram~?s 13, 1 3a onto t;he dle platforms ', 45, 45a between the pillars 43, 44 o~' the dle 30 adJacent one end of the wire and likewise at the other end of the wlre (Flg. 5a). The carriages 16, 17 are spaced at the DlaXimUm dlstance apart as shown in Fig. 1. The drlve motors 37, 37a are started to rota~e tho di~ 30, 31 ln opposite directions as indicated b~r the arrow~ ln Fllg. 5a. The plllars 43, . , .
- , .
~ .
O8()5 7.
44 and 43a, 44a and the flxed stops 5 and 5' on the machine frame trap the wire ~ection 3 at the two locations where lt is deslred to form a right-angle bend. Slnce the wire section 3 is not ~ree to move becau~e it is being pulled in oppo~lte directlons, the dles 30, ~1 can only rotate by ~ovlng toward~
each other wlth the carriage~ 16, 17. The end of the flr~t 3tage of the bending operatlon 16 shown ln Flg. 5b~ The dles 30, 31 are slightly clo~er together, the end~ 3a, 3b of the wire ha~e been bent at rlght-angles to the central ~ection 3c, and the ~top~ 46, 46a overlie the wlre in the vicinity of the bends.
-The vertical bending mechani~m is now operated.
The cylinder 50 lifts the H-fra~e through a pre-determined distance so that the proJections 54, 55 of the H-fr~e 51 and the pro~ectlons 56, 57 of the fork 53 rai~e the wlre into the po~ltion ahown ln Fig. 5c, upward movement of the ends of the wire being prevented by the stops 46, 46a. The vertical ~pacing between the Hrframe 51 and the fork 53, and hence between the proJectlon~ 54, 55 on the one hand and the proJections 56, 57 on the other hand, determlne~ the angle of inclination of the wire portlon~ 3d, 3e adJacent the dies 30, 31. As rotatlon o~ the dies 30, 31 continueE~, the carriages 16, 17 cont'Lnuo to ro~e together and the ~lro portlon~ 3e wrap round tho dlo bodie~ 41, 41a to A
, . ~ ,. ,. :.. i. , . , ~
.
~ ~it~8(~5 form ~piral loop~ ~, 3~ as shown ln Fig. 5d. The pltch o~ the 8piral and hence the height of the coll i8 determined by the inclinatlon of the wlre portions 3d, 3e i.n Flg" 5c and can therefore be varied by changing the t~pacing of the ~ork 53 with re~pect to the ~rame ~1.
The wlre ~ection 3 i8 now lifted off the dieR
30, 31 and ~ub~ected to a further bending operatlon to turn in the ends 3h, 3i and coDplete the double ~pring element described ln our aforesald Europe~n Patent Appllcation, A~ soon as the wlre section 3 ha~ been removed from the dles 30, 31 the carrlage~
16, 17 are free to nove apart to the qtartlng po~ltion under the lnfluence of the return ~echanism lnc:ludlng the ra~ re~ber 29. The operation~ are then repeated wlth another wlre ~ectlon 3.
~- .
to be li~ted when the carriage~ 16, 17 move together.
W~len the formed wire section i8 removed ~rom the dles the weight falls to move the carriages apart.
Each carrlage 16, 17 mounts a generally cylindrical steel dle/30, 31 rotatable about a vertlcal axis. Since both dles and t;heir drive mechanisms are similarly constructed only the die 30 and its associated drive mechanism will be described, the correspondlng parts ol~ the other Z5 die 31 and 'Lts drive mechanism being designated by the Isame reference numeralls with the ~uffl~ a.
The die ~0 has a drive Ishaft 32 which e~tends .~ .
' '~
OS
downwardly from the carriage 17 through a bearing support 33 and termlnates in a drive ~procket 34 (Fig. 1d). A drlve chaln 35 connects the sprocket 34 with a drlve ~procket 36 on the output ~haft of an electrlc drive motor 37 whlch is mounted on a carrler 38 pivotal about a vertlcal axis ~9 common to the other carrier 38a of the motor ~7a (Fig. 1e), The distance between the driLve ~proc~cets 34, 36 is flxed by a telescopically adJustable bar 40. This arrangemerlt of pivotally mounted motor and rigid interconnection between the drive sprockets enables the drive sprockets 34, 34a to travel on a rectilin-ear path whlle pivoting about the other drlve sprockets 36, 36a which are them~elves caused to pivot about the common axis 39 as indicated by the arrows in Fig. 1 e.
The upper ends of the drive shafts 32, 32a are fixed to the dies 30, 31. As already mentioned, only the die 30 will be described, corresponding parts on the other die, 31 being designated by the same reference numerals with the ~uffix a. The die 30 has a cylindrical body 41 with a fIusto-conical upper end 42. At the lower end of the die 30 are two radially and circumIerentially spaced pillars 43, 44. The pll]Ler 43 ls spaced ~rom the body 41 on a radlally pro,~ectlng plat~or~ 4!5 nnd the longer plllar 44 18 wolded dlrectly to the body 41. The A
.' , ,: "' , O8(~5 6.
axes of the pillars 43, 44 are parallel to the a~cis of rotatlon of the die 30. At the oppo~lte ~lde of the pillar 44 from the pillar 43 a cylindrlcal stop 46 proJects from the body 41 at a level between the upper ends of' the two plllars 43, 44. The stop 46 i8 ilxed in a radial bore 47 in the die body 41 by means of a clamping ~crew 48 in a side bore 49.
Vertical bending o~ the wire i~ achieved by the ~echanlsm ~hown ln inset 1a but omitted from Flg. 1 for the sake of clarity. It compri6es a double-acting cylinder 50 arranged to plvot an H-frame 51 about a fixed member 52. Mounted on the H-frame 51 with ad~ustable spacing therefrom ls a fork 53. Wire engaging pro~ectlon~ 54, 55 extend ~rom t,he front ends of the side members of the H-frame 51 and the fork 53 has slmilar pro~ect-ion~ 56~ 57 in the same vertlc al pl~e as the pro~ections 54, 55.
A wire section 3 fed to the deforming mechanism 4 rolls down the ram~?s 13, 1 3a onto t;he dle platforms ', 45, 45a between the pillars 43, 44 o~' the dle 30 adJacent one end of the wire and likewise at the other end of the wlre (Flg. 5a). The carriages 16, 17 are spaced at the DlaXimUm dlstance apart as shown in Fig. 1. The drlve motors 37, 37a are started to rota~e tho di~ 30, 31 ln opposite directions as indicated b~r the arrow~ ln Fllg. 5a. The plllars 43, . , .
- , .
~ .
O8()5 7.
44 and 43a, 44a and the flxed stops 5 and 5' on the machine frame trap the wire ~ection 3 at the two locations where lt is deslred to form a right-angle bend. Slnce the wire section 3 is not ~ree to move becau~e it is being pulled in oppo~lte directlons, the dles 30, ~1 can only rotate by ~ovlng toward~
each other wlth the carriage~ 16, 17. The end of the flr~t 3tage of the bending operatlon 16 shown ln Flg. 5b~ The dles 30, 31 are slightly clo~er together, the end~ 3a, 3b of the wire ha~e been bent at rlght-angles to the central ~ection 3c, and the ~top~ 46, 46a overlie the wlre in the vicinity of the bends.
-The vertical bending mechani~m is now operated.
The cylinder 50 lifts the H-fra~e through a pre-determined distance so that the proJections 54, 55 of the H-fr~e 51 and the pro~ectlons 56, 57 of the fork 53 rai~e the wlre into the po~ltion ahown ln Fig. 5c, upward movement of the ends of the wire being prevented by the stops 46, 46a. The vertical ~pacing between the Hrframe 51 and the fork 53, and hence between the proJectlon~ 54, 55 on the one hand and the proJections 56, 57 on the other hand, determlne~ the angle of inclination of the wire portlon~ 3d, 3e adJacent the dies 30, 31. As rotatlon o~ the dies 30, 31 continueE~, the carriages 16, 17 cont'Lnuo to ro~e together and the ~lro portlon~ 3e wrap round tho dlo bodie~ 41, 41a to A
, . ~ ,. ,. :.. i. , . , ~
.
~ ~it~8(~5 form ~piral loop~ ~, 3~ as shown ln Fig. 5d. The pltch o~ the 8piral and hence the height of the coll i8 determined by the inclinatlon of the wlre portions 3d, 3e i.n Flg" 5c and can therefore be varied by changing the t~pacing of the ~ork 53 with re~pect to the ~rame ~1.
The wlre ~ection 3 i8 now lifted off the dieR
30, 31 and ~ub~ected to a further bending operatlon to turn in the ends 3h, 3i and coDplete the double ~pring element described ln our aforesald Europe~n Patent Appllcation, A~ soon as the wlre section 3 ha~ been removed from the dles 30, 31 the carrlage~
16, 17 are free to nove apart to the qtartlng po~ltion under the lnfluence of the return ~echanism lnc:ludlng the ra~ re~ber 29. The operation~ are then repeated wlth another wlre ~ectlon 3.
~- .
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Wire forming apparatus comprising a pair of rotary dies movable together and apart on a rectilinear path and adapted to hold a length of wire at opposite ends thereof such that on contra-rotation the dies approach each other while deforming said ends into coils, wherein means is provided for continuously mov-ing a central section of the wire in a direction parallel to the axes of rotation of the dies during approach movement of the dies so as to control the angle of inclination of the wire adjacent the dies with respect to the axes of rotation thereof, thereby imparting a desired pitch and height to said coils.
2. Apparatus as claimed in claim 1, wherein lifting means is provided for lifting a central section of the wire dur-ing approach movement of the dies so as to impart a desired pitch and height to said coils.
3. Apparatus as claimed in claim 2, wherein said lift-ing means comprises fixed stroke drive means connected to a first lifting member carrying a second lifting member which is adjustable with respect to the first lifting member in the lift-ing direction so as to vary the inclination of the wire adjacent the dies, and thereby said pitch.
4. Apparatus as claimed in claim 2 or 3, wherein said dies have respective detents for restraining upward movement of said wire under the influence of said lifting means.
5. Apparatus as claimed in claim 1, wherein each die has two projections which are radially and angularly spaced with respect to the axis of rotation so as to engage the wire from opposite sides thereof and impart a bending force thereto on rotation of the die.
6. Apparatus as claimed in claim 5, wherein the con-nection of the radially outer projection to the body of the die provides a support for the wire at the start of the coiling oper-ation.
7. Apparatus as claimed in claim 1, 2 or 3, wherein the dies are cylindrical in order to form spiral coils.
8. Apparatus as claimed in claim 1, 2 or 3, wherein each die is driven by a respective drive motor and chain trans-mission, the two motors being mounted for pivotal movement about a common axis under the influence in each case of a rigid con-necting arm pivotally joined to the motor and the die.
9. Apparatus as claimed in claim 1, 2 or 3, further comprising means for automatically returning the dies to their starting position after removal of a finished wire.
10. Apparatus as claimed in claim 1, 2 or 3, wherein feed means is provided for feeding successive lengths of wires to the dies, said feed means comprising hopper means for receiving a supply of said wire length, inclined chute means for feeding a single layer stream of said lengths from the hopper towards the dies, and separating means for separating the leading length of wire from said stream for delivery to said dies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8327306 | 1983-10-12 | ||
| GB08327306A GB2150473B (en) | 1983-10-12 | 1983-10-12 | Wire forming apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260805A true CA1260805A (en) | 1989-09-26 |
Family
ID=10550072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465158A Expired CA1260805A (en) | 1983-10-12 | 1984-10-11 | Wire forming apparatus |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4592223A (en) |
| EP (1) | EP0138560B1 (en) |
| JP (1) | JPS60137535A (en) |
| AT (1) | ATE31884T1 (en) |
| AU (1) | AU572205B2 (en) |
| CA (1) | CA1260805A (en) |
| DE (1) | DE3468634D1 (en) |
| GB (1) | GB2150473B (en) |
| ZA (1) | ZA847913B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6612143B1 (en) * | 2001-04-13 | 2003-09-02 | Orametrix, Inc. | Robot and method for bending orthodontic archwires and other medical devices |
| US6595054B2 (en) | 2001-05-14 | 2003-07-22 | Paroscientific, Inc. | Digital angular rate and acceleration sensor |
| DE102022204096A1 (en) | 2022-04-27 | 2023-11-02 | Mahle International Gmbh | Heat exchanger |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US112868A (en) * | 1871-03-21 | Improvement in machines for coiling bed-springs | ||
| US484426A (en) * | 1892-10-18 | Wire-coiling machine | ||
| US904563A (en) * | 1907-10-18 | 1908-11-24 | Allan R Raff | Machine for making wall-ties. |
| AT181161B (en) * | 1952-04-16 | 1955-02-25 | Franz Held | Concrete iron bending machine, in particular for the production of weak iron brackets |
| AT316268B (en) * | 1972-05-02 | 1974-07-10 | Evg Entwicklung Verwert Ges | Bending machine for rod or strip material |
| GB1459948A (en) * | 1973-10-31 | 1976-12-31 | France Bed Co | Wire-spring manufacturing |
| US3872896A (en) * | 1974-02-27 | 1975-03-25 | Nhk Spring Co Ltd | Apparatus for twisting wave form wire springs |
| JPS58110148A (en) * | 1981-12-23 | 1983-06-30 | Toyota Motor Corp | Method and apparatus for formed wire |
| EP0097477B1 (en) * | 1982-06-18 | 1988-04-13 | Silentnight Holdings Plc | Box spring assemblies |
-
1983
- 1983-10-12 GB GB08327306A patent/GB2150473B/en not_active Expired
-
1984
- 1984-10-05 US US06/658,136 patent/US4592223A/en not_active Expired - Fee Related
- 1984-10-09 DE DE8484306878T patent/DE3468634D1/en not_active Expired
- 1984-10-09 EP EP84306878A patent/EP0138560B1/en not_active Expired
- 1984-10-09 ZA ZA847913A patent/ZA847913B/en unknown
- 1984-10-09 AT AT84306878T patent/ATE31884T1/en not_active IP Right Cessation
- 1984-10-11 CA CA000465158A patent/CA1260805A/en not_active Expired
- 1984-10-11 JP JP59211546A patent/JPS60137535A/en active Pending
- 1984-10-12 AU AU34186/84A patent/AU572205B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA847913B (en) | 1985-06-26 |
| EP0138560A3 (en) | 1985-10-02 |
| GB2150473B (en) | 1987-06-24 |
| EP0138560A2 (en) | 1985-04-24 |
| AU572205B2 (en) | 1988-05-05 |
| GB8327306D0 (en) | 1983-11-16 |
| AU3418684A (en) | 1985-04-18 |
| DE3468634D1 (en) | 1988-02-18 |
| EP0138560B1 (en) | 1988-01-13 |
| GB2150473A (en) | 1985-07-03 |
| ATE31884T1 (en) | 1988-01-15 |
| US4592223A (en) | 1986-06-03 |
| JPS60137535A (en) | 1985-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |