US3559432A - Roll gap gage control - Google Patents

Roll gap gage control Download PDF

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Publication number
US3559432A
US3559432A US732998A US3559432DA US3559432A US 3559432 A US3559432 A US 3559432A US 732998 A US732998 A US 732998A US 3559432D A US3559432D A US 3559432DA US 3559432 A US3559432 A US 3559432A
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United States
Prior art keywords
mill
signal
control
rolls
fluid
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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
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US732998A
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English (en)
Inventor
Telesfore Rastelli
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.)
JONES & LAMSON WATERBURY FARREL CORP A CORP OF DE
Textron Inc
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Textron Inc
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Publication of US3559432A publication Critical patent/US3559432A/en
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Assigned to JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIAL GROUP INCORPORATED, A CORP. OF DE. reassignment JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIAL GROUP INCORPORATED, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JONES & LAMSON MACHINE COMPANY, INC., A DE. CORP.
Assigned to JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIAL GROUP INCORPORATED, BANK OF BOSTON , A CORP. OF DE. reassignment JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIAL GROUP INCORPORATED, BANK OF BOSTON , A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JONES & LAMSON MACHINES COMPANY, INC.,
Assigned to JONES & LAMSON WATERBURY FARREL CORP., A CORP. OF DE. reassignment JONES & LAMSON WATERBURY FARREL CORP., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JL MACHINE ACQUISITION CORP.
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands

Definitions

  • This invention relates to a system for controlling the gap between rolls of a mill and, more particularly, to a system for deriving a signal to effect constant roll gap control.
  • this invention provides a new and improved apparatus and system for effecting constant roll gap gage control.
  • a stiff mill or a soft mill can be obtained.
  • a soft mill can be made by mill adjustment in the direction of mill deflection, whereas a stiff mill is accomplished by a mill adjustment in the opposite direction of mill deflection.
  • This invention provides advantages over the prior art in that there are no gears 'or screws in the chocks which must be duplicated for spare chocks for roll changing. In addition, there are no screwdown drives which must be disconnected when changing rolls. Furthermore, with this invention, the mill screwdown position may be set prior to entering the strip into the mill and the mill loads are not in excess of rolling loads. This equipment also achieves significant cost advantages by reducing the number of sensors required.
  • gage control is effected by the use of an error signal which indicates that a mill adjustment must be made.
  • the error signal is derived from a screwdown transducer and a load cell. The signals from these devices are so related that their combination will produce an error signal indicative of the change in roll gap from the desired setting.
  • the error signal so derived is directed to a servo valve to command a mill adjustment in a direction to correct the error. In a soft mill, the error signal is used to command a mill adjustment in a direction which will reduce the change in mill load.
  • Another object of this invention is to provide a new and improved roll gap control system which, by adjustment, may provide either a stiff or soft mill.
  • FIG. 1 diagrammatically illustrates the mill according to this invention
  • FIG. 2 is a block diagram illustrating the hydraulics and a portion of the electrical system for controlling the mill according to the invention
  • FIG. 3 is a circuit diagram illustrating the electronic controls of the mill according to the invention.
  • FIG. 4 diagrammatically illustrates a modification according to this invention
  • FIG. 5 is a diagrammatic illustration of another mill (only half being shown) having position control, according to the invention.
  • FIG. 6 is a diagrammatic illustration of a three-way mechanical feedback servo valve for use in the embodiment of FIG. 5.
  • FIGS. 1 and 2 there is shown the mill housing at 10 in which a pair of work rolls 11 and 12 is supported.
  • the work rolls in turn are supported, respectively, by back-up rolls 13 and 14, roll 14 being supported in a bearing chock 15 and roll 13 being supported in a bearing chock 16.
  • the bearing chock 16 is movable within the housing 10 in a direction shown by the arrows in FIG. 1.
  • a strip of material is shown being processed by the mill at 17.
  • a hydraulic cylinder 20 having a piston 21, the lower member 22 and an upper member 23.
  • the lower member 22 pushes downwardly on a load cell 24 to apply pressure to the bearing chock 16 to set the gap between the rolls 11 and 12.
  • the load cell 24 may be of the type sold by The Revere Corporation of America, Wallingford, Conn. A description of the operation of the load cell will be given in conjunction with the description of FIG. 3. Fluid is provided to the hydraulic cylinder 20 by means of passages 25 and 26, shown in FIG. 1.
  • a mechanism 28 controlling a screw 29 which controls the setting of a coil 30 forming a part of a displacement transducer such as Model 24 DCDT-1000 sold by Sanborn Division of Hewlett Packard Corporation, Waltham, Mass.
  • a core of the displacement transducer is shown at 31 and is mounted on a member 32 supported on the upper member 23 coupled to the piston 21. In this manner, the core 31 moves in accordance with the movement of the piston 21.
  • the means for adjusting the roll gap also includes an adjusting screw drive means and clutch or coupling means for controlling the other side of the mill.
  • FIG. 1 there is shown the hydraulics and a portion of the electrical circuit for controlling the mill, according to the invention.
  • signals are provided form the load cell which indicates the upward force on the Work roll 11 and from the displacement transducer coil 30' as a result of the position of the core 31.
  • These two signals are then combined in the control circuitry shown at 35 to produce an error signal which then controls a servo valve 36 which, in turn, controls the amount and direction of fluid entering the hydraulic cylinder 20.
  • the fluid is obtained from a hydraulic pump, sump and motor arrangement generally shown at 37.
  • signals are also obtained from a rear transducer over a dotted line 38 and from a rear load cell over dotted line 39 and are then separately analyzed by a control system shown at 40 to provide an error signal on line 41, which then operates to control a servo valve 42.
  • Fluid is provided through the valve 42 to the hydraulic cylinder controlling the other side or rear of the mill by way of a pump, sump and motor arrangement generaly shown at 43.
  • the load cell is generally shown at 24 and includes a bridge network 45 for deriving a signal which is applied to a bridge balancing network 46, thence to pre-amplifier 47.
  • the amplifier may be of the type produced by Nexus Research Laboratories of Canton, Mass., Catalog No. CDA 22.
  • the signal from the load cell is applied to a mill stiffness control circiut 48 which comprises two variable resistors 49 and 50 for controlling the range of operation.
  • a signal is derived from a center tapped potentiometer 51 and is applied to a servo valve amplifier 55.
  • the amplifier 55 may be of the type sold by Nashua Servo Controls Company, Nashua, NH, Model 720. At the same time, a signal is applied from the displacement transducer coil 30 to the amplifier 55. The output of the amplifier 55 which is a function of the two signals, is then applied to the servo valve 36 through its coil 57 to control the passage of fluid into the hydraulic cylinder 20 to constantly control the gap betwen the work rolls 11 and 12. By the use of the center tapped resistor potentiometer 51, it is possible to apply either positive or negative feedback signals. By applying positive feedback signals, a stiff mill may be obtained and by applying negative feedback signals, a soft mill may be obtained.
  • pressure transducers may be used to measure the pressure of the hydraulic fluid within the cylinder 20.
  • a sensor or sensing device may be built into the member 22 to measure piston rod strain or into the housing 10 in order to determine the load. Accordingly, it is desired that the invention not be limited to the particular use of the load cell shown. It should be further understood that this invention is also applicable to a two-high mill and other mill configurations.
  • FIG. 4 there is shown a modification of the invention.
  • two rolls 60 and 61 are supported in a housing such that their journals are mounted one on top of the other.
  • a double-acting hydraulic cylinder 62 is provided to which fluid is provided through a servo valve 63 controlled by electronic signals from an electronic amplifier 64.
  • the pressure on the rolls is detected by the use of a load cell 65 which provides a signal, which signal is combined with a signal provided from a displacement transducer 67.
  • the outer coil 68 of transducer 67 is controlled with respect to the inner core 60 by a stepper motor 70 which controls a lead screw 71 to set the position of the coil 68.
  • the motor 70 is responsive to signals from a pulse signal source 72.
  • FIG. 5 there is shown a roll gage control system which utilizes a three-way servo valve in combination with feedback means to effect mill adjustment.
  • a half of a mill is shown generally at and includes a plurality of rolls 81 adapted to roll material passing between the work rolls.
  • a double-acting hydraulic cylinder 82 having a piston 83 and piston rods 84.
  • the rods 84 act through an intermediate member to force the roll journals, supporting the rolls and, thus the rolls, together.
  • the cylinder 82 has two chambers, one being the upper shown at 85 and the lower chamber shown at 86. Fluid is provided to control the piston 83 by way of a source or supply generally shown at 87 through the tube 88.
  • Fluid to the upper chamber 85 is provided through a tubing 89 positioned on one side of a flow divider shown at 90.
  • the pressure in the upper chamber 85 is maintained constant by the use of an adjustable setting pressure regulator 91.
  • tubes 93 and 94 are positioned on either side of the flow divider (so named in the drawing) for providing fluid through a three-way servo valve 95 which, essentially, is a two-position valve having a springpositioned spool.
  • the servo valve 95 is electromagnetically controlled by signals provided from an amplifier 96 from signals provided from a transducer 97 having a coil 98 and a core 99 movable with the piston 83 and mounted on the rod 84.
  • the position of the core 99 is adjusted by a motor 100 through a gear arrangement shown at 101 which moves a member 102 to position the coil 98 with respect to the core 99.
  • the amplifier 96 provides a signal to the electromagnet of the valve 95 to permit fluid to flow through the tube 93 into the lower chamber 86.
  • the pressure regulator 103 coupled to the tubing 94.
  • the regulator 103 acts to cause the pressure in the lower chamber 86 to drop to the preset back pressure, set by the regulator 103.
  • the servo valve 95 is connected such that the tubing 94 is coupled to the lower chamber 86.
  • FIG. 6 of the drawings shows a modification of the device of FIG. 5, in that, in place of the electrical feedback system and the three-way electrical servo valve, a three-way mechanical servo valve is used.
  • the valve 110 is controlled by a feedback rack arrangement 111 which controls the position of the spool of the valve 110.
  • a mill having a plurality of work rolls and at least one back-up roll for each work roll, said mill having hydraulic screwdown means in the form of a cylinder including a piston and piston rod adapted to act on at least one of said back-up rolls, position control means for said hydraulic screwdown means for controlling the hydraulic screwdown means to position the back-up roll to set the gap between said work rolls, the improvement comprising first pressure responsive means for deriving a first signal indicative of the load on said work rolls, means for deriving a second signal indicative of the relative position of the rolls, means for combining the first signal with the second signal to derive an error signal, means for applying said error signal to said position control means to control said hydraulic screwdown means and effect constant roll gap control.
  • said position control means includes a displacement transducer comprising a coil body and a core movable with said piston within said coil body.
  • said first means includes means for setting the stiffness of the mill to provide either a stiff or soft mill.
  • said position control means includes a stepping motor, a movable coil and a core, said stepping motor coupled to position said coil with respect to said core.
  • a screwdown system for a mill having a plurality of rolls supported by roll supporting means
  • the improvement comprising in combination a double-acting hydraulic cylinder having upper and lower fluid chambers positioned on either side of a piston having rod means for causing said rolls to be forced together, first means for providing fluid to each of said chambers, second means for controlling the pressure of the fluid in said upper chamber, third means for controlling the flow of fluid into said lower chamber, said third means including roll position signal generating means responsive to the position of said piston and a servo valve responsive to a signal from said position signal generating means to control the fluid provided to the lower chamber of said cylinder.
  • said means for deriving a second signal provides a position feedback signal and said position control means comprises a threeway servo valve responsive to said error signal to control the fluid provided to said lower chamber,
  • said position feedback means comprises a coil and core movable relative to each other.
  • said screwdown means is a double-acting hydraulic cylinder having upper and lower fluid chambers positioned on either side of a piston having rod means for causing said rolls to be forced together, first means for providing fluid to each of said chambers, second means for controlling the flow of fluid into said chamber, said second means including a roll position signal generating means responsive to the position of said piston and an electrically actuated servo valve responsive to a signal from said position signal generating means for controlling the fluid provided to the chamber of said cylinder,
  • the arrangement of claim 12 further comprising a member responsive to the pressure between said piston and said rolls for providing a signal indicative of the mill deflection as a result of rolling material, and means for combining said mill deflection signal and the signal from said position signal generating means to provide a command signal to said servo valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US732998A 1968-05-29 1968-05-29 Roll gap gage control Expired - Lifetime US3559432A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73299868A 1968-05-29 1968-05-29

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US732998A Expired - Lifetime US3559432A (en) 1968-05-29 1968-05-29 Roll gap gage control

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Country Link
US (1) US3559432A (enrdf_load_stackoverflow)
JP (1) JPS4819068B1 (enrdf_load_stackoverflow)
BE (1) BE733707A (enrdf_load_stackoverflow)
DE (1) DE1927085A1 (enrdf_load_stackoverflow)
FR (1) FR2009601A1 (enrdf_load_stackoverflow)
GB (1) GB1216180A (enrdf_load_stackoverflow)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686907A (en) * 1971-02-24 1972-08-29 Evgeny Vyacheslavovich Sokolov Device for automatic thickness control of rolled strips
US3693385A (en) * 1969-09-29 1972-09-26 Ube Industries Fluid control system for selectively self-adjusting mill reduction force or interworking roll distance
US3736782A (en) * 1969-10-22 1973-06-05 Hitachi Ltd Thrusting devices for rolling mills
US3757553A (en) * 1971-08-13 1973-09-11 Wean United Inc Hydraulic mills
US3824830A (en) * 1971-11-17 1974-07-23 Morgaardshammar Ab Two-high rolling stand
US3839944A (en) * 1968-12-13 1974-10-08 Davy Loewy Ltd Transducer mounting arrangement
US3906767A (en) * 1974-05-31 1975-09-23 Mitsubishi Heavy Ind Ltd Hydraulic roll-gap control system
US3938362A (en) * 1973-02-12 1976-02-17 Ab Metalform Apparatus for the plastic working of material
US4038857A (en) * 1976-04-26 1977-08-02 Blaw-Knox Foundry & Mill Machinery, Inc. Hydraulic mill stand
EP0044222A3 (en) * 1980-07-16 1982-04-21 Davy Mckee (Sheffield) Limited Rolling mills
US4457155A (en) * 1982-03-03 1984-07-03 White Consolidated Industries, Inc. Overhung bar rolling mill stand and two-axis gauge control system
US4458514A (en) * 1982-03-03 1984-07-10 Davy Mckee (Sheffield) Limited Position control of piston-cylinder device
US4730472A (en) * 1986-07-10 1988-03-15 United Engineering, Inc. Hydraulic contouring means for a hot or cold leveler machine
EP0928643A3 (de) * 1998-01-07 2001-09-26 SMS Demag AG Walzgerüst zum Walzen von Draht
US20090093910A1 (en) * 2007-10-05 2009-04-09 Grosz Gregory C Controllable Caliper
US20120246917A1 (en) * 2011-04-01 2012-10-04 Ihi Corporation Continuous press apparatus for electrode band plate
US20170232491A1 (en) * 2016-02-17 2017-08-17 Oono-roll Corporation Hydraulic screw-down device used in small-size rolling mill or roll press machine and hydraulic control method using the same
RU2663028C2 (ru) * 2016-10-26 2018-08-01 Министерство образования и науки РФ Федеральное государственное бюджетное образовательное учреждение высшего образования "Норильский государственный индустриальный институт" Гидравлическое установочное устройство
CN113617855A (zh) * 2021-07-16 2021-11-09 太原科技大学 一种轧机控制方法以及系统
CN114522986A (zh) * 2022-03-25 2022-05-24 马鞍山钢铁股份有限公司 一种热卷箱夹送辊辊缝调整结构及调整方法
RU2774541C1 (ru) * 2021-11-09 2022-06-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) Автомат разгрузки гидропривода
US20230060110A1 (en) * 2019-12-11 2023-02-23 Sms Group Gmbh Hot-rolling stand for a hot-rolling mill and for producing a flat metal product, hot-rolling mill and method for operating a hot-rolling mill

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974672A (en) * 1975-09-19 1976-08-17 Herbst John F Mill hydraulic screw-down
JPS52141366U (enrdf_load_stackoverflow) * 1976-04-20 1977-10-26
US4481800A (en) * 1982-10-22 1984-11-13 Kennecott Corporation Cold rolling mill for metal strip
DE3420501A1 (de) * 1984-06-01 1985-12-05 Mannesmann AG, 4000 Düsseldorf Walzenanstellanzeige
GB9213770D0 (en) * 1992-06-29 1992-08-12 Davy Mckee Sheffield An hydraulic load capsule for a metal working rolling mill
RU2122474C1 (ru) * 1998-01-05 1998-11-27 Акционерное общество "Новолипецкий металлургический комбинат" Способ контроля перекоса валков клети прокатного стана в горизонтальной плоскости

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839944A (en) * 1968-12-13 1974-10-08 Davy Loewy Ltd Transducer mounting arrangement
US3693385A (en) * 1969-09-29 1972-09-26 Ube Industries Fluid control system for selectively self-adjusting mill reduction force or interworking roll distance
US3736782A (en) * 1969-10-22 1973-06-05 Hitachi Ltd Thrusting devices for rolling mills
US3686907A (en) * 1971-02-24 1972-08-29 Evgeny Vyacheslavovich Sokolov Device for automatic thickness control of rolled strips
US3757553A (en) * 1971-08-13 1973-09-11 Wean United Inc Hydraulic mills
US3824830A (en) * 1971-11-17 1974-07-23 Morgaardshammar Ab Two-high rolling stand
US3938362A (en) * 1973-02-12 1976-02-17 Ab Metalform Apparatus for the plastic working of material
US3906767A (en) * 1974-05-31 1975-09-23 Mitsubishi Heavy Ind Ltd Hydraulic roll-gap control system
US4038857A (en) * 1976-04-26 1977-08-02 Blaw-Knox Foundry & Mill Machinery, Inc. Hydraulic mill stand
EP0044222A3 (en) * 1980-07-16 1982-04-21 Davy Mckee (Sheffield) Limited Rolling mills
US4457155A (en) * 1982-03-03 1984-07-03 White Consolidated Industries, Inc. Overhung bar rolling mill stand and two-axis gauge control system
US4458514A (en) * 1982-03-03 1984-07-10 Davy Mckee (Sheffield) Limited Position control of piston-cylinder device
US4730472A (en) * 1986-07-10 1988-03-15 United Engineering, Inc. Hydraulic contouring means for a hot or cold leveler machine
EP0928643A3 (de) * 1998-01-07 2001-09-26 SMS Demag AG Walzgerüst zum Walzen von Draht
US20090093910A1 (en) * 2007-10-05 2009-04-09 Grosz Gregory C Controllable Caliper
US8744801B2 (en) 2007-10-05 2014-06-03 Oceaneering International, Inc. Controllable caliper
US20140259720A1 (en) * 2007-10-05 2014-09-18 Oceaneering International, Inc. Controllable caliper
US9784552B2 (en) * 2007-10-05 2017-10-10 Oceaneering International, Inc. Controllable caliper
WO2009046109A3 (en) * 2007-10-05 2010-01-21 Oceaneering International, Inc. Controllable caliper
US20120246917A1 (en) * 2011-04-01 2012-10-04 Ihi Corporation Continuous press apparatus for electrode band plate
US10562086B2 (en) * 2016-02-17 2020-02-18 Oono-roll Corporation Hydraulic screw-down device used in small-size rolling mill or roll press machine and hydraulic control method using the same
US20170232491A1 (en) * 2016-02-17 2017-08-17 Oono-roll Corporation Hydraulic screw-down device used in small-size rolling mill or roll press machine and hydraulic control method using the same
RU2663028C2 (ru) * 2016-10-26 2018-08-01 Министерство образования и науки РФ Федеральное государственное бюджетное образовательное учреждение высшего образования "Норильский государственный индустриальный институт" Гидравлическое установочное устройство
US20230060110A1 (en) * 2019-12-11 2023-02-23 Sms Group Gmbh Hot-rolling stand for a hot-rolling mill and for producing a flat metal product, hot-rolling mill and method for operating a hot-rolling mill
US12343776B2 (en) * 2019-12-11 2025-07-01 Sms Group Gmbh Hot-rolling stand for a hot-rolling mill and for producing a flat metal product, hot-rolling mill and method for operating a hot-rolling mill
CN113617855A (zh) * 2021-07-16 2021-11-09 太原科技大学 一种轧机控制方法以及系统
CN113617855B (zh) * 2021-07-16 2023-02-17 太原科技大学 一种轧机控制方法以及系统
RU2774541C1 (ru) * 2021-11-09 2022-06-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) Автомат разгрузки гидропривода
CN114522986A (zh) * 2022-03-25 2022-05-24 马鞍山钢铁股份有限公司 一种热卷箱夹送辊辊缝调整结构及调整方法
CN114522986B (zh) * 2022-03-25 2023-08-22 马鞍山钢铁股份有限公司 一种热卷箱夹送辊辊缝调整结构及调整方法

Also Published As

Publication number Publication date
DE1927085A1 (de) 1969-12-04
BE733707A (enrdf_load_stackoverflow) 1969-11-03
JPS4819068B1 (enrdf_load_stackoverflow) 1973-06-11
FR2009601A1 (enrdf_load_stackoverflow) 1970-02-06
GB1216180A (en) 1970-12-16

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AS Assignment

Owner name: JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JONES & LAMSON MACHINE COMPANY, INC., A DE. CORP.;REEL/FRAME:005031/0442

Effective date: 19880802

AS Assignment

Owner name: JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JONES & LAMSON MACHINES COMPANY, INC.,;REEL/FRAME:005080/0699

Effective date: 19880802

AS Assignment

Owner name: JONES & LAMSON WATERBURY FARREL CORP., A CORP. OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JL MACHINE ACQUISITION CORP.;REEL/FRAME:005077/0476

Effective date: 19890509