US3788122A - Bending machine for wire or strip - Google Patents

Bending machine for wire or strip Download PDF

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Publication number
US3788122A
US3788122A US00314402A US3788122DA US3788122A US 3788122 A US3788122 A US 3788122A US 00314402 A US00314402 A US 00314402A US 3788122D A US3788122D A US 3788122DA US 3788122 A US3788122 A US 3788122A
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US
United States
Prior art keywords
link
rocker
swing
adjustment lever
machine according
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
Application number
US00314402A
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English (en)
Inventor
J Ritter
O Gamillscheg
W Boyer
H Gott
K Ritter
G Ritter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EVG Entwicklungs und Verwertungs GmbH
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EVG Entwicklungs und Verwertungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by EVG Entwicklungs und Verwertungs GmbH filed Critical EVG Entwicklungs und Verwertungs GmbH
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Publication of US3788122A publication Critical patent/US3788122A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete

Definitions

  • ABSTRACT The invention is concerned with a bending machine for wire or strip in which the raw material is advanced through the machine step by step and, between each step, a bend is made by a mobile bending tool.
  • the bending tool is driven through a linkage which incorporates a control that can be operated whilst the machine is working to make a continuous adjustment to the working stroke of the bending tool and thus to the angle of bend made.
  • the invention relates to a bending machine for wire or strip, in which the raw material for bending is advanced through the machine intermittently, step by step, the length of each step being the desired distance between each two successive bends, a bend being made, after each step of advance, by an intermittently driven mobile bending tool which bends the wire or strip through the desired angle around a stationary yoke.
  • the machine preferably has a shearing device for cutting the wire or strip after the desired number of bends have been made.
  • the machine is intended particularly for making bent hoops for reinforced concrete structures.
  • the object of the invention is to remove these difficulties and to provide a bending machine of the kind described but which, by simple constructional means, allows the bending angle to be varied during operation of the machine.
  • drive is transmitted from a motor through a clutch to one end of a connecting rod which in turn drives the mobile bending tool
  • the drive being arranged in that the other end of the connecting rod is pivoted by a double pivot to one end of a swing link and also to one end of a working link, the other end of the working link being pivoted to a rocker which rocks in a stationary bearing and is directly or indirectly connected to the mobilebending tool, the other end of the swing link being pivoted to an adjustment-lever which is itself pivoted in a stationary bearing and controlled'in such a way that the position of the adjustment lever relative to the stationary bearing of the rocker and relative to the pivot at which the working link is pivoted to therocker, is variable for the purpose of adjusting the angular working stroke of the mobile bending tool and thus the angle of the bend made.
  • the effective lengthof the working link is the same as the effective length of the adjustment lever and preferably the same as the distance between the stationary bearing of the adjustment lever and the stationary bearing of the rocker connected to the mobile bending tool.
  • the arrangement provides a particularly. effective power transmission system.
  • This system can be arranged in such a way that the pivot where the swing link is pivoted to the adjustment lever is adjustable in position all the way from a location at which this pivot coincides in position with the pivot where the working link is pivoted to the rocker, to a constructionally determined final limiting location.
  • the bending angle varies continuously all the way from 0 to its own constructionally determined final value.
  • the angular position of the adjustment lever can be adjustable by means of an adjustment spindle which engages with the adjustment lever, the adjustment spindle being actuated either manually or by means of a preferably programmed controlling servo motor.
  • the rocker connected to the mobile bending tool may be in the form of a bell crank connected through a connecting link and a crank lever to the shaft to which the bending tool is fixed.
  • the shaft to which the bending tool is fixed can conveniently be a hollow shaft and it can contain an axially slidable, automatically actuated ejector pin. This simple and compact arrangement provides automatic ejection of the completed wire hoops or other bent wire or strip articles.
  • FIG. 1 is a diagrammatical overall view of the machine
  • FIG. 2 represents diagrammatically the adjustable driving system
  • FIG. 3 is a front view corresponding to FIG. 2, but stretched out in the direction of the arrow P to make the individual parts easily visible without overlap.
  • a wire 1 which is to be used for making bent hoops, is conveyed into the machine by two pairs of conveyor rollers 2, 2a and 3, 3a, which drive the wire along by a frictional grip.
  • the conveyor rollers are driven by an electric motor 4 through a V-belt 5.
  • the V-belt drives a flywheel 6 which is coupled by a clutch (not shown) to a pinion 7 which engages with a toothed wheel 8.
  • the toothed wheel 5 is fixed to a shaft to which is also fixed a chain sprocket wheel 9 over which runs an' endless chain 10 which is kept under constant tension by a tensioning roller 11.
  • the chain 10 drives four sprocket wheels, over which it is partly looped, the sprocket wheels being fixed to the conveyor rollers 2, 2a and 3,30, so that in effect the electric motor 4-drives the conveyor rollers whenever the clutch which couples the two parts 6 and 7 together is engaged.
  • the two upper conveyor rollers 2 and 2a are vertically mobile within limits and are thrust resiliently downwards against the uppersurface of the wire by springs, whose spring loads are adjustable by means of the two adjustment screws 12 and 13.
  • the wire 1 Downstream of the conveyor rollers 2, 2a and 3, 3a the wire 1 passes through' a straightening device 14 of known kind, which straightens the wire out. Downstream of the straightening device 14 the wire drives, by frictional contact, a measuring drum 15 which is pivoted on an axle 16 and thrust into contact with the surface of the wire by a spring.
  • the measuring drum 15 drives the pulse generator of an electronic length measuring device of the kind described in our British Pat. application No. 59144/71. This electronic device measures the distance advanced by the wire and controls a shearing device which automatically cuts off the desired lengths of wire.
  • the wire Downstream of the measuring drum the wire passes between a stationary blade 17 and a mobile blade 18 of the shearing device, after which the wire reaches the bending device proper, consisting essentially of a stationary bending anvil l9 and a mobile bending tool 20.
  • the bending device is driven by an electric motor 21 through a V-belt 22 which drives a flywheel 23 that can be coupled by a clutch (not shown) to a pinion 24 which engages with a toothed wheel 25.
  • the toothed wheel 25 is fixed to a shaft to which is also fixed an eccentric 26 which drives the bending tool through a connecting rod 27 and a system of linkages.
  • the other end of the connecting rod 27 is pivoted by a double pivot 37 to a working link 28 and a swing link 29.
  • an adjustment lever 30 is pivoted at its lower end in a stationary bearing 31, the upper end of the adjustment lever 30 being adjustable in position by means of an adjustment spindle 32. Rotation of the adjustment spindle 32 causes the adjustment lever 30 to pivot back and forth in its stationary bearing 31.
  • the swing link 29 is pivoted at its upper end, at 33, to the adjustment lever 30.
  • the upper end of the working link 28 is pivoted at 34 to one arm of a Z-armed rocker 35 which is pivoted in a stationary bearing 36.
  • the effective length of the working link 28 measured as the distance between its two pivot points 37 and 34 is preferably the same as the effective length of the swing link.29, measured between its two pivot points 37 and 33 and this is preferably the same as the effective length of the adjustment lever 30, measured between its two'pivot points 31 and 33.
  • this same length is preferably repeated a fourth time, in that the distance between the two stationary bearings 31 and'36 is preferably equal to the effective lengths of the working link 28, the swing link 29 and the adjustment lever 30.
  • the arrangement allows any desired angular movement of the rocker 35, between 0 and a constructionally determined upper limit, to be obtained, by stepless adjustment, for each half turn through 180 of the eccentric 26.
  • the free end of the adjustment lever 30 is driven forwards, by rotating the adjustment spindle 32, until the pivot point 33 comes to coincide with the pivot point 34.
  • rotation of the eccentric 26 merely swings the two links 28 and 29 in common about the coincidence point, no angular movement being applied to the rocker 35 because the distance between the pivot points 37 and 34 would remain the same even if the working link 28 were not present.
  • the working link 28 now preventing any change in the distance between the pivot points 37 and 34 by rocking the rocker 35 through a finite angle during each half turn of the eccentric 26.
  • the angle of movement of the rocker 35 depends on the distance between the pivot points 33 and 34 and is greatest when this distance reaches its greatest constructionally possible value.
  • the other arm of the 2-armed rocker 35 is connected, through a pivoted connecting link 38, to a lever 39 fixed to a hollow shaft 41 to which is also fixed the bending tool 20 so that the rocking movement of the rocker 35 is transmitted to the bending tool. Consequently when the eccentric 26 rotates an oscillatory movement is transmitted, through the linkage system 27 to 34, to the rocker 35, which oscillates in its fixed bearing 36, and through the connecting link 38, the lever 39 and the hollow shaft 41 to the bending tool 20, causing the latter to oscillate about the axis of the hollow shaft 41.
  • the angular movement of the bending tool 20 is continuously adjustable by adjusting the angular position of the adjustment lever 30 by means of the adjustment spindle 32.
  • the adjustment spindle 32 therefore serves for adjusting the angle through which the wire is bent over, allowance being made, when calculating this angle, for the different spring constants of wires of different qualities, so as to compensate for different rebounding behaviours.
  • the connecting link 38 can be adjustable in length for the purpose of adjusting the position of rest of the bending tool 20 precisely so as to ensure that each bending operation starts out from the same initial position, irrespective of the instantaneous position of the adjustment spindle 32.
  • the hollow shaft 41 which rotates in bearings 48, contains an ejector pin 51 in the form of the piston rod of a piston 86 working in a cylinder 89.
  • FIG. 2 shows the piston 86 with its ejector pin 51 in the position of rest. A completed hoop is ejected by driving the piston 86 out towards the left, and almost immediately afterwards retracting it.
  • the adjustment spindle 32 can if desired be operated by hand, although it can if desired by operated by an automatically controlled positioning motor.
  • the bending tool 20 During the second half rotation of the eccentric 26 the bending tool 20 returns to its initial position. The bending operation is repeated until all the desired bends have been made, whereupon the wire is sheared off between the two shearing blades 17 and 18.
  • the shearing device is driven by a drive system similar to those used for advancing the wire and for bending it.
  • An electric motor 62 drives the shearing device through a V-belt 63 and a flywheel 64 connected through a clutch to a pinion 65 which engages with a toothed wheel 66.
  • the toothed wheel 66 drives the mobile shearing blade 18 through an eccentric 67 and a connecting rod 68.
  • a machine for bending wire or strip comprising means for intermittently advancing raw material for bending, step by step, the length of each step being the desired distance between two successive bends, a stationary anvil, and an intermittently driven mobile bending tool which bends said wire or strip through a desired angle around said anvil; an improved drive for said bending tool comprising a motor, a clutch operatively connected to said motor, a connecting rod having first and second ends, said first end of said connecting rod being connected to said clutch to be driven by said motor therethrough, a double pivot at said second end of said connecting rod, a swing-link having first and second ends, said first end of said swing-link being pivoted to said double pivot, a working link having first and second ends, said first end of said working link being pivoted to said double pivot, a first stationary bearing, a rocker which rocks in said first stationary bearing, means pivotally connecting said rocker to said second end of said working link, means interconnecting said rocker to said bending tool, a second stationary bearing,
  • pivotal connection between said swing-link and said adjustment lever is adjustable in position continuously from a location at which said last named pivotal connection coincides in position with said pivotal connection between said working link and said rocker, to a constructionally determined final limiting location.
  • a machine wherein said angular position of said adjustment lever is adjustable by means of an adjustment spindle adapted to be actuated manually or by means of a programmed controlling servo motor.
  • rocker is in the form of a bell crank and the invention further comprises a crank lever, a connecting link innumber of bends have been made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Transmission Devices (AREA)
US00314402A 1972-04-12 1972-12-12 Bending machine for wire or strip Expired - Lifetime US3788122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT318172A AT316267B (de) 1972-04-12 1972-04-12 Biegemaschine für draht- oder bandförmiges Material

Publications (1)

Publication Number Publication Date
US3788122A true US3788122A (en) 1974-01-29

Family

ID=3546602

Family Applications (1)

Application Number Title Priority Date Filing Date
US00314402A Expired - Lifetime US3788122A (en) 1972-04-12 1972-12-12 Bending machine for wire or strip

Country Status (18)

Country Link
US (1) US3788122A (fr)
JP (1) JPS4916667A (fr)
AT (1) AT316267B (fr)
BE (1) BE786376A (fr)
BR (1) BR7300890D0 (fr)
CA (1) CA972270A (fr)
CH (1) CH544593A (fr)
CS (1) CS175447B2 (fr)
DE (1) DE2232828C3 (fr)
ES (1) ES404560A1 (fr)
FR (1) FR2179693B1 (fr)
GB (1) GB1351539A (fr)
IT (1) IT962788B (fr)
LU (1) LU65657A1 (fr)
NL (1) NL7209689A (fr)
PL (1) PL84832B1 (fr)
SU (1) SU453817A3 (fr)
ZA (1) ZA728629B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964290A (en) * 1988-10-20 1990-10-23 Usui Kokusai Sangyo Kaisha Ltd. Small-diameter metallic conduit bending machine
US4977771A (en) * 1988-12-30 1990-12-18 Usui Kokusai Sangyo Kaisha Ltd. Device for bending thin metallic pipe
US5014533A (en) * 1987-06-03 1991-05-14 Ergon S.A. Wire processing machine
EP0770466A2 (fr) 1993-07-14 1997-05-02 Foaming Technologies Cardio B.V. Procédé de battage et système de fabrication continue de blocs de mousse de polyuréthane
US5632175A (en) * 1995-10-27 1997-05-27 Green; Paul O. Rebar fabricating apparatus
US20070095006A1 (en) * 2005-11-01 2007-05-03 Konersmann Ronald D Lightweight portable concrete enclosure and associated method of construction
CN101249542B (zh) * 2008-03-12 2010-06-02 冯广建 一种多弯头钢筋折弯机
CN109382792A (zh) * 2018-12-12 2019-02-26 福建易动力电子科技股份有限公司 一种改变吊具开口角度的工具
CN117428113A (zh) * 2023-11-14 2024-01-23 深圳市新力超精密连接器科技有限公司 一种排针加工用弯折装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119299A (en) * 1982-03-04 1983-11-16 Pa Management Consult Making cutting tools
CH655260A5 (it) * 1983-08-23 1986-04-15 Albino Castiglioni Macchina di tranciatura e stampaggio con equilibratura delle masse per consentire l'aumento della velocita di lavoro.
CN101791665B (zh) * 2009-11-20 2011-10-05 天津市建科机械制造有限公司 钢筋自动弯箍机的回送弯曲机构
CN110434250A (zh) * 2019-08-27 2019-11-12 永康雪纺自动化设备有限公司 一种快速双联动折弯机
CN110681724B (zh) * 2019-09-26 2021-02-19 界首市南都华宇电源有限公司 一种极板加工用压辊定位装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US223472A (en) * 1880-01-13 Machine for making eyebolts
US803499A (en) * 1905-03-01 1905-10-31 American Steel & Wire Co Bale-tie machine.
US1769570A (en) * 1927-12-28 1930-07-01 Hudson Motor Car Co Apparatus for shaping sheet metal
US2810199A (en) * 1955-01-25 1957-10-22 Arthur P Lyon Strand measuring device
US2974707A (en) * 1959-02-10 1961-03-14 Cyril Bath Co Table drive for rotary metal forming machines
US3424208A (en) * 1966-07-05 1969-01-28 Raymond A Heisler Wire handling apparatus
US3428097A (en) * 1966-07-20 1969-02-18 Otto W Schaefer Wire straightening and cutting mechanism

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2691896A (en) * 1949-10-14 1954-10-19 Sterling O Stageberg Variable speed power transmission

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US223472A (en) * 1880-01-13 Machine for making eyebolts
US803499A (en) * 1905-03-01 1905-10-31 American Steel & Wire Co Bale-tie machine.
US1769570A (en) * 1927-12-28 1930-07-01 Hudson Motor Car Co Apparatus for shaping sheet metal
US2810199A (en) * 1955-01-25 1957-10-22 Arthur P Lyon Strand measuring device
US2974707A (en) * 1959-02-10 1961-03-14 Cyril Bath Co Table drive for rotary metal forming machines
US3424208A (en) * 1966-07-05 1969-01-28 Raymond A Heisler Wire handling apparatus
US3428097A (en) * 1966-07-20 1969-02-18 Otto W Schaefer Wire straightening and cutting mechanism

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014533A (en) * 1987-06-03 1991-05-14 Ergon S.A. Wire processing machine
US4964290A (en) * 1988-10-20 1990-10-23 Usui Kokusai Sangyo Kaisha Ltd. Small-diameter metallic conduit bending machine
US4977771A (en) * 1988-12-30 1990-12-18 Usui Kokusai Sangyo Kaisha Ltd. Device for bending thin metallic pipe
EP0770466A2 (fr) 1993-07-14 1997-05-02 Foaming Technologies Cardio B.V. Procédé de battage et système de fabrication continue de blocs de mousse de polyuréthane
US5632175A (en) * 1995-10-27 1997-05-27 Green; Paul O. Rebar fabricating apparatus
US20070095006A1 (en) * 2005-11-01 2007-05-03 Konersmann Ronald D Lightweight portable concrete enclosure and associated method of construction
CN101249542B (zh) * 2008-03-12 2010-06-02 冯广建 一种多弯头钢筋折弯机
CN109382792A (zh) * 2018-12-12 2019-02-26 福建易动力电子科技股份有限公司 一种改变吊具开口角度的工具
CN109382792B (zh) * 2018-12-12 2024-02-02 福建易动力电子科技股份有限公司 一种改变吊具开口角度的工具
CN117428113A (zh) * 2023-11-14 2024-01-23 深圳市新力超精密连接器科技有限公司 一种排针加工用弯折装置
CN117428113B (zh) * 2023-11-14 2024-06-11 深圳市新力超精密连接器科技有限公司 一种排针加工用弯折装置

Also Published As

Publication number Publication date
CA972270A (en) 1975-08-05
GB1351539A (en) 1974-05-01
ES404560A1 (es) 1975-06-16
ZA728629B (en) 1973-08-29
DE2232828C3 (de) 1975-11-20
NL7209689A (fr) 1973-10-16
AT316267B (de) 1974-07-10
CH544593A (de) 1973-11-30
JPS4916667A (fr) 1974-02-14
PL84832B1 (fr) 1976-04-30
LU65657A1 (fr) 1972-10-30
CS175447B2 (fr) 1977-05-31
DE2232828B2 (de) 1975-04-10
FR2179693A1 (fr) 1973-11-23
DE2232828A1 (de) 1973-10-25
FR2179693B1 (fr) 1975-11-21
IT962788B (it) 1973-12-31
BR7300890D0 (pt) 1974-02-19
SU453817A3 (fr) 1974-12-15
BE786376A (fr) 1972-11-16
AU4982972A (en) 1974-06-13

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