EP0255740B1 - Drive unit for draw benches - Google Patents
Drive unit for draw benches Download PDFInfo
- Publication number
- EP0255740B1 EP0255740B1 EP87201277A EP87201277A EP0255740B1 EP 0255740 B1 EP0255740 B1 EP 0255740B1 EP 87201277 A EP87201277 A EP 87201277A EP 87201277 A EP87201277 A EP 87201277A EP 0255740 B1 EP0255740 B1 EP 0255740B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive unit
- carriage
- gear wheel
- pinion
- rack
- 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 - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/27—Carriages; Drives
- B21C1/30—Drives, e.g. carriage-traversing mechanisms; Driving elements, e.g. drawing chains; Controlling the drive
Definitions
- This invention concerns a drive unit for draw benches in accordance with the preamble of the main claim as is known for instance from GB-A-824056.
- the drive unit is an assemblage of elements on the drawn benches which serves to provide the draw carriages with their to-and-fro movement and the necessary force.
- the invention concerns the drive cams and the elements which transmit to the draw carriages their movement and the required force.
- the drive cams consist of a drum-type cam having frontal contact between a path on the cam and a connecting roller.
- a type of cam entails very considerable dimensions.
- Such increase in power and in the sizes of the cams involve a plurality of appreciable problems.
- a third general problem with this type of drive is connected with the transverse component which drum-type cams create with frontal paths.
- US 2,126,453 discloses two coaxial cams with a circumferential action, which act on complex levers that act directly on the draw grippers.
- US 2,234,728 is an improvement of US 2,126,453.
- GB 2,018,658 discloses circumferential cams acting on levers, which in turn operate the draw grippers.
- the invention enables simpler cams to be produced by employing a harder material (the known art now requires frontal cams to be made of cast steel, thus limiting the choices available).
- the invention enables also a better balancing and equalising of the whole system to be obtained when the motion is inverted.
- the invention enables a drive in an oil bath or with force feed lubrication to be obtained, together with the considerable advantages produced thereby.
- the invention provides an open, radial cam, which is called tangential or harmonic in some quarters and comprises on its periphery a rolling path on which a roller presses.
- Such roller is connected to a shaft which actuates by means of a first rack a pair of coaxial gear wheels solidly fixed together and having a preferred ratio to each other.
- the gear wheel not engaged with the first rack acts on a second rack comprised on a draw carriage.
- two gear wheels not engaged with the first rack may be provided so as to balance better the stress transmitted to the carriage.
- such wheels may be associated in only one gear wheel.
- the shaft acts on a lever, which may have one or two arms and is connected at its end to the carriage in such a way that it can oscillate.
- roller is associated directly with the aforesaid lever.
- Such lever performs the same functions as the system which comprises a first rack on the shaft, a pair of gear wheels and a second rack on the draw carriage.
- the cam-roller-shaft-etc. system is normally duplicated so as to have one carriage moving forward in the drawing step, while there is another carriage in the return step, such carriages holding the coaxial drawing grippers.
- the invention is therefore embodied with a drive unit for draw benches which is suitable to provide carriages bearing draw grippers with a required, coordinated to-and-fro movement, a radial cam cooperating with each carriage and pressing on a roller borne on a first shaft able to move axially with a first rack with which a pinion is engaged that is coaxial with and solidly fixed to a gearing-up gear wheel acting on a second rack included on the carriage, a desired preferred ratio existing between the pinion and the gear wheel, the pinion and gear wheel having an axis which is rotary but not displaceable.
- a motor 10 is connected to a gearing-down unit 11 which transmits motion to a cam shaft 12.
- a gearing-down unit 11 which transmits motion to a cam shaft 12.
- two cams 13-113 are fitted to the cam shaft 12 and counterweights 29 are provided.
- Such cams 13-113 may also be machined on the cam shaft 12 and be a part thereof.
- the cams 13-113 are of a radial type, or tangential type as otherwise denominated, and the path on them for cooperation with rollers 14-114 respectively is located on their circumferential periphery. The result of this is that cooperation between path and roller is the best possible, without different and simultaneous instantaneous peripheral speeds.
- rollers 14-114 cooperate with a first shaft 15-115 supported and guided axially by bearings 19 in the draw bench.
- the first shaft 15-115 may comprise elements to prevent rotation and springs to keep the respective roller 14-114 pressed against its respective cam 13-113.
- a first rack 16-116 is comprised on the shaft 15-115 and cooperates with a pinion 17-117, which is, or is caused to be, solidly fixed to a second shaft 23-123, to which a toothed wheel 18-118 is also solidly fixed.
- the second shaft 23-123 may comprise two toothed wheels 18-118, which are respectively referenced with A and B.
- a determined ratio, selected as required during design work and dimensioning, is established between the toothed wheel 18-118 and pinion 17-117.
- a system to store and recover energy is comprised at the end of or in cooperation with the first shaft 15-115 and may be a mechanical system with a spring or a hydraulic or combined system.
- the system to store and recover energy consists of a plunger 20 cooperating with a chamber 21, which in turn cooperates with a hydraulic storage reservoir 22.
- the toothed wheel 18-118 (or the toothed wheels 18A-18B-118A-118B in the variant) cooperates with a second rack 25-125 comprised on a carriage 24-124 holding draw grippers 27 which act on rod 30 being drawn.
- Means 28 to store and recover energy may be provided in cooperation with the draw carriages 24-124 and may consist, for instance, of springs or hydraulic means.
- the whole assemblage is contained in a suitably formed box-wise structure 26, which enables the system to be lubricated plentifully without any loss or waste of oil.
- the actuation assemblage may consist also of a lever, so that instead of the first rack 16, pinion 17, toothed wheel 18 and second rack 25 one lever may be provided in cooperation with the first shaft 15 and carriage 24 and be supported by the structure so as to be able to oscillate.
Abstract
Description
- This invention concerns a drive unit for draw benches in accordance with the preamble of the main claim as is known for instance from GB-A-824056. The drive unit is an assemblage of elements on the drawn benches which serves to provide the draw carriages with their to-and-fro movement and the necessary force. The invention concerns the drive cams and the elements which transmit to the draw carriages their movement and the required force.
- At the present time the drive cams consist of a drum-type cam having frontal contact between a path on the cam and a connecting roller. With the increase of power required and increase of speed such a type of cam entails very considerable dimensions. Such increase in power and in the sizes of the cams involve a plurality of appreciable problems.
- Firstly, a general problem of this type of drive is that it compels the various elements to work in a dry or substantially dry state.
- Another general problem arises from the fact that the roller and frontal cam slide against each other owing to the varying peripheral speed of the path of the cam, such path being comprised between two different radii.
- A third general problem with this type of drive is connected with the transverse component which drum-type cams create with frontal paths.
- The modern requirements of greater power and bigger sizes entail the embodiment of very large axial cams with heavily inclined coils, and this fact makes even more evident the general problem cited above.
- US 2,126,453 discloses two coaxial cams with a circumferential action, which act on complex levers that act directly on the draw grippers.
- US 2,234,728 is an improvement of US 2,126,453.
- GB 2,018,658 discloses circumferential cams acting on levers, which in turn operate the draw grippers.
- US 3,693,395 discloses drum-type cams the profile of which serves to drive the gripper-bearing carriage directly.
- The present applicant has studied and embodied this invention so as to overcome such drawbacks and obtain a further plurality of advantages.
- Besides overcoming the general and particular problems indicated above and further problems which will become clear in the following description, the invention enables simpler cams to be produced by employing a harder material (the known art now requires frontal cams to be made of cast steel, thus limiting the choices available).
- The invention enables also a better balancing and equalising of the whole system to be obtained when the motion is inverted.
- Moreover, a greatly reduced overturning torque on the carriage is also obtained.
- Furthermore, the maximum specific pressure between the roller and cam is lower since contact between the two elements is maintained in a correct manner.
- Besides the above, the invention enables a drive in an oil bath or with force feed lubrication to be obtained, together with the considerable advantages produced thereby.
- The invention provides an open, radial cam, which is called tangential or harmonic in some quarters and comprises on its periphery a rolling path on which a roller presses.
- Such roller is connected to a shaft which actuates by means of a first rack a pair of coaxial gear wheels solidly fixed together and having a preferred ratio to each other.
- The gear wheel not engaged with the first rack acts on a second rack comprised on a draw carriage.
- In a variant two gear wheels not engaged with the first rack may be provided so as to balance better the stress transmitted to the carriage.
- In another variant, where the ratio between the two gear wheels is 1:1, such wheels may be associated in only one gear wheel.
- In a further variant, which is described here but not illustrated hereinafter, the shaft acts on a lever, which may have one or two arms and is connected at its end to the carriage in such a way that it can oscillate.
- In yet another variant the roller is associated directly with the aforesaid lever.
- Such lever performs the same functions as the system which comprises a first rack on the shaft, a pair of gear wheels and a second rack on the draw carriage.
- The cam-roller-shaft-etc. system is normally duplicated so as to have one carriage moving forward in the drawing step, while there is another carriage in the return step, such carriages holding the coaxial drawing grippers.
- The invention is therefore embodied with a drive unit for draw benches which is suitable to provide carriages bearing draw grippers with a required, coordinated to-and-fro movement, a radial cam cooperating with each carriage and pressing on a roller borne on a first shaft able to move axially with a first rack with which a pinion is engaged that is coaxial with and solidly fixed to a gearing-up gear wheel acting on a second rack included on the carriage, a desired preferred ratio existing between the pinion and the gear wheel, the pinion and gear wheel having an axis which is rotary but not displaceable.
- Let us now see a preferred embodiment of the invention with the help of the attached figures, which provide a non-restrictive example and in which:
- Fig.1
- shows an embodiment according to the invention from above;
- Fig.2
- gives a side view of the embodiment of Fig.1;
- Fig.3
- shows a vertical section of the embodiment of Fig.1;
- Fig.4
- shows a variant of Fig.3.
- In the figures a
motor 10 is connected to a gearing-down unit 11 which transmits motion to acam shaft 12. In the example shown two cams 13-113 are fitted to thecam shaft 12 andcounterweights 29 are provided. Such cams 13-113 may also be machined on thecam shaft 12 and be a part thereof. - The cams 13-113 are of a radial type, or tangential type as otherwise denominated, and the path on them for cooperation with rollers 14-114 respectively is located on their circumferential periphery. The result of this is that cooperation between path and roller is the best possible, without different and simultaneous instantaneous peripheral speeds.
- The rollers 14-114 cooperate with a first shaft 15-115 supported and guided axially by
bearings 19 in the draw bench. - The first shaft 15-115 may comprise elements to prevent rotation and springs to keep the respective roller 14-114 pressed against its respective cam 13-113.
- A first rack 16-116 is comprised on the shaft 15-115 and cooperates with a pinion 17-117, which is, or is caused to be, solidly fixed to a second shaft 23-123, to which a toothed wheel 18-118 is also solidly fixed.
- In a variant the second shaft 23-123 may comprise two toothed wheels 18-118, which are respectively referenced with A and B.
- A determined ratio, selected as required during design work and dimensioning, is established between the toothed wheel 18-118 and pinion 17-117.
- In a variant a system to store and recover energy is comprised at the end of or in cooperation with the first shaft 15-115 and may be a mechanical system with a spring or a hydraulic or combined system.
- In the example shown the system to store and recover energy consists of a
plunger 20 cooperating with achamber 21, which in turn cooperates with ahydraulic storage reservoir 22. - When the
plunger 20 is thrust into thechamber 21, energy is stored and is returned when the thrust action stops. - The toothed wheel 18-118 (or the toothed wheels 18A-18B-118A-118B in the variant) cooperates with a second rack 25-125 comprised on a carriage 24-124
holding draw grippers 27 which act onrod 30 being drawn. - Means 28 to store and recover energy may be provided in cooperation with the draw carriages 24-124 and may consist, for instance, of springs or hydraulic means.
- The whole assemblage is contained in a suitably formed
box-wise structure 26, which enables the system to be lubricated plentifully without any loss or waste of oil. - As said earlier, the actuation assemblage may consist also of a lever, so that instead of the
first rack 16,pinion 17,toothed wheel 18 andsecond rack 25 one lever may be provided in cooperation with thefirst shaft 15 andcarriage 24 and be supported by the structure so as to be able to oscillate. - In a variant such lever bears the
roller 14 and is actuated directly by thecam 13. - If it is desired to improve the performance of the unit,, it is possible to arrange for the
carriage 24 to cooperate with hydraulically supportedslide blocks 31.
Claims (6)
- Drive unit for draw benches which is suitable to provide carriages (24) bearing draw grippers (27) with a required coordinated to-and-fro movement, comprising a cam (13) cooperating with each carriage (24) via a gearing-up gear wheel (18) acting on a rack (25) included on the carriage (24), the gear wheel (18) having an axis which is rotary but not displaceable, characterised in that the cam is a rotary radial cam (13) pressing on a roller (14) born on a first shaft (15) able to move axially with an other rack (16) with which a pinion (17) is engaged, said pinion (17) is coaxial with and solidly fixed to said gearing-up gear wheel (18), and a desired preferred ratio exists between the said pinion (17) and the said gear wheel (18).
- Drive unit as claimed in Claim 1, which comprises two gear wheels (18) that act on second racks (25) included on the carriage (24).
- Drive unit as claimed in Claims 1 and 2, in which means to store and recover energy are associated with the carriage (24).
- Drive unit as claimed in any Claims hereinbefore, in which the means to store and recover energy are mechanical (springs).
- Drive unit as claimed in any of Claims 1 to 3 inclusive, in which the means to store and recover energy are hydraulic.
- Drive unit as claimed in any Claim hereinbefore, in which the means to store and recover energy comprise air springs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87201277T ATE61950T1 (en) | 1986-08-06 | 1987-07-04 | DRIVE FOR DRAWING BENCHES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8339186 | 1986-08-06 | ||
IT83391/86A IT1201802B (en) | 1986-08-06 | 1986-08-06 | CONTROL UNIT FOR DRAWING BENCHES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0255740A1 EP0255740A1 (en) | 1988-02-10 |
EP0255740B1 true EP0255740B1 (en) | 1991-03-27 |
Family
ID=11321189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87201277A Expired - Lifetime EP0255740B1 (en) | 1986-08-06 | 1987-07-04 | Drive unit for draw benches |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0255740B1 (en) |
AT (1) | ATE61950T1 (en) |
DE (1) | DE3768875D1 (en) |
IT (1) | IT1201802B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1256093B (en) * | 1992-11-04 | 1995-11-27 | CONTROL UNIT FOR SHOOTING TROLLEYS, IN PARTICULAR FOR DRAWING BENCHES | |
US20060052194A1 (en) * | 2004-09-03 | 2006-03-09 | Gerring Douglas G | Torsional force linear tensioner |
CN112520833B (en) * | 2020-11-30 | 2021-08-31 | 鹤壁市质量技术监督检验测试中心 | Laboratory sewage neutralization apparatus |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE444479C (en) * | 1926-03-28 | 1927-05-18 | Wilhelm Helsper | Pipe drawing bench |
US2126453A (en) * | 1936-09-14 | 1938-08-09 | William W Criley | Apparatus for forming blanks from hot rolled wire stock |
US2234728A (en) * | 1939-07-12 | 1941-03-11 | Ajax Mfg Co | Feeding and straightening means |
GB824056A (en) * | 1957-07-18 | 1959-11-25 | Fritz Singer | A feeding mechanism, particularly for tube-stretching machines |
DE1936139A1 (en) * | 1969-07-16 | 1971-07-01 | Schumag Schumacher Metallwerke | Slide drawing machine |
DE2739812A1 (en) * | 1977-09-03 | 1979-03-08 | Forst Maschf Oswald | DRAWING MACHINE |
AT372312B (en) * | 1978-02-13 | 1983-09-26 | Mannesmann Ag | SLIDE DRAWING MACHINE WITH TWO DRAWING SLIDES GUIDED IN THE SLIDING PATHS ON THE MACHINE FRAME |
-
1986
- 1986-08-06 IT IT83391/86A patent/IT1201802B/en active
-
1987
- 1987-07-04 EP EP87201277A patent/EP0255740B1/en not_active Expired - Lifetime
- 1987-07-04 AT AT87201277T patent/ATE61950T1/en not_active IP Right Cessation
- 1987-07-04 DE DE8787201277T patent/DE3768875D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
IT8683391A0 (en) | 1986-08-06 |
EP0255740A1 (en) | 1988-02-10 |
ATE61950T1 (en) | 1991-04-15 |
DE3768875D1 (en) | 1991-05-02 |
IT1201802B (en) | 1989-02-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102059402A (en) | Full closed-loop numerical control gear shaper for large-scale hydraulic main drive cutting | |
FR2537468A1 (en) | MOBILE BEAM MANIPULATOR FOR PRINTING PRESSES OR THE LIKE | |
EP0255740B1 (en) | Drive unit for draw benches | |
US3025646A (en) | Spindle | |
EP1084028A1 (en) | Sudden braking apparatus for press | |
US3103838A (en) | Two-speed spindle | |
US3245290A (en) | Machine tools | |
CN110756596A (en) | Impact-resistant cold rolling mill chuck box | |
SU797563A3 (en) | Gear-slotting lathe | |
US2232889A (en) | High-speed forging press | |
US1993131A (en) | Change speed device | |
US3893327A (en) | Radial-swaging machine | |
US4735080A (en) | Forming machine with ram-side ejector mechanism | |
US2213450A (en) | Punch press | |
US3138960A (en) | Infinitely variable speed transmission and differential drive therefor | |
SU1228956A1 (en) | Hydraulic screw press for forming by rolling | |
US3606804A (en) | Device for the application of a turret head to a workpiece | |
US2804925A (en) | Shearing apparatus | |
SU479555A1 (en) | High Speed Metal Forming Machine | |
SU551194A1 (en) | Machine for spherical stamping of metal blanks | |
US3096674A (en) | Headstock for lathe | |
US2994992A (en) | Radius grinding machine and spindle | |
US3002258A (en) | Chuck-actuating means | |
CA2278875A1 (en) | Rotator for a machine for machining metal sheets | |
SU382498A1 (en) | DEVICE FOR AUTOMATIC CHANGE OF TOOL OF METAL CUTTING MACHINE |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19880630 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: DANIELI NATISONE - OFFICINE MECCANICHE SRL Owner name: DANIELI & C. OFFICINE MECCANICHE S.P.A. |
|
17Q | First examination report despatched |
Effective date: 19900125 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: DANIELI NATISONE SPA Owner name: DANIELI & C. OFFICINE MECCANICHE S.P.A. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO GLP S.R.L. |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19910327 Ref country code: NL Effective date: 19910327 Ref country code: LI Effective date: 19910327 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19910327 Ref country code: CH Effective date: 19910327 Ref country code: BE Effective date: 19910327 Ref country code: AT Effective date: 19910327 |
|
REF | Corresponds to: |
Ref document number: 61950 Country of ref document: AT Date of ref document: 19910415 Kind code of ref document: T |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3768875 Country of ref document: DE Date of ref document: 19910502 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19910708 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19910731 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
K2C3 | Correction of patent specification (complete document) published |
Effective date: 19910327 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20060627 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060630 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060728 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20060731 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20070703 |