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WO2002064281A1 - Gripper feeder for metal strip - Google Patents

Gripper feeder for metal strip Download PDF

Info

Publication number
WO2002064281A1
WO2002064281A1 PCT/EP2001/011866 EP0111866W WO02064281A1 WO 2002064281 A1 WO2002064281 A1 WO 2002064281A1 EP 0111866 W EP0111866 W EP 0111866W WO 02064281 A1 WO02064281 A1 WO 02064281A1
Authority
WO
WIPO (PCT)
Prior art keywords
gripper
feeder
strip
grippers
metal strip
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.)
Ceased
Application number
PCT/EP2001/011866
Other languages
French (fr)
Inventor
Sergio Dallan
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.)
Dalcos SRL
Original Assignee
Dalcos SRL
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
Publication date
Application filed by Dalcos SRL filed Critical Dalcos SRL
Priority to EP01273715A priority Critical patent/EP1360020A1/en
Publication of WO2002064281A1 publication Critical patent/WO2002064281A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • B23Q7/04—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
    • B23Q7/048—Multiple gripper units
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/16—Advancing webs by web-gripping means, e.g. grippers, clips

Definitions

  • This invention relates to a gripper feeder for metal strip.
  • Metal strip feeders are known for those presses and machines in which the strip is subjected to particular predetermined operations.
  • a known type of feeder comprises a pair of grippers for engaging the metal strip to be advanced, members for moving the grippers in a direction parallel to the axis of said strip and in the opposite direction, and means for independently operating said grippers such that while the gripper which moves in the direction of advancement of the strip is activated, that which moves in the opposite direction is deactivated.
  • the mover members consist of a bar presenting two portions threaded in opposite directions which engage a threaded bush provided on a gripper of each pair, a motor being provided, powered alternately in the two directions of rotation.
  • These known feeders have however the drawback of advancing the strip intermittently. This intermittent advancement is due on the one hand to the advancement pitch of the grippers and on the other hand to the operation pitch. In this respect, on the basis of an advancement pitch of 1 m and an operation pitch of 2.5 m, the advancement of the strip has to be halted every metre to allow "gripper changeover" and enable the strip to be halted every 2.5 m as required by the operating cycle.
  • Figure 1 is a side view of a first embodiment of a gripper feeder according to the invention
  • Figure 2 is a cross-section therethrough on the line ll-ll of figure 1
  • Figure 3 is a plan view thereof
  • Figure 4 is a plan view of a second embodiment
  • Figure 5 is a side view thereof.
  • the gripper feeder for metal strip comprises, in the embodiment shown in Figures 1 to 3, a base 2 on which two linear motors 4, 4' are mounted.
  • Each linear motor 4, 4' comprises a stator 6, 6' and a carriage 8, 8' supporting a gripper 10, 10'.
  • a single stator could also be used, on which the two carriages slide independently.
  • Each gripper 10, 10' comprises a fixed jaw 12, 12' rigid with the carriage 8, 8", and a movable jaw 14, 14' moved relative to the corresponding fixed jaw 12, 12' by a pneumatic actuator 16, 16' of vertical axis.
  • transverse guides 16 On the base there are also mounted transverse guides 16, along which carriages 20 slide supporting rollers 22 of vertical axis having in their lateral surface a groove for engaging and guiding the longitudinal edge of the metal strip to be advanced.
  • the carriages 20 are moved along the respective guides by operating handwheels 26.
  • the invention also comprises a control centre for controlling the various constituent elements of the feeder, such as the pneumatic jaw actuator, the linear motors etc.
  • the operation of the feeder in this embodiment is as follows: the machine is firstly adjusted to adapt it to the width of strip to be fed; this adjustment involves operating the actuators which control the distance between the grippers, and then the actuators which control the distance between the rollers 22. Having undergone this preliminary adjustment, the feeder is ready to operate, assuming that the initial configuration is that in which the carriages 8, 8' are as close together as possible, with the carriage 8 moving in the strip advancement direction, the jaws 12 and 14 closed to grip the strip, the carriage 8' moving in the opposite direction to the strip advancement direction, and the jaws 12', 14' open (see Figure 3). Following activation of the stator 6 the carriage 8 moves in the direction indicated by the arrow 27 in figure 3 with the carriage 8' moving at the same time in the direction indicated by the arrow 28 in the same figure, following activation of the stator 6".
  • the two carriages can be advanced not only with different speeds but also with variable speed, so that while the carriage 8 always moves at constant speed towards its front end-of- travel position, the other carriage 8' moves at greater speed than the carriage 8 to reach its rear end-of travel position, then reverses its direction and attains the same advancement speed as the other carriage 8, then before this reaches its front end-of-travel position, i.e. before the jaws 12, 14 loosen their grip, it intervenes with its jaws 12', 14' to grip the metal strip and continue to advance it in a virtually continuous manner.
  • the carriage 8' operates in a like manner, in that after reaching its front end-of-travel position, it reverses its travel direction, attains the speed of the other carriage 8 and arranges its jaws to grip the metal strip.
  • two pairs of linear motors positioned side by side on each section are provided.
  • This embodiment of so-called “electric tree” type, is particularly advantageous for very wide strip.
  • the feeder comprises two electric motors 30, 30', the shafts of which are rigidly connected to two threaded rods 32, 32' engaging threaded bushes 34, 34' provided on carriages 36, 36' supporting the grippers 38, 38'.
  • the carriages are rigid with two slides 40, 40' slidable along longitudinal guide rails 42, 42'.
  • the operation of the feeder of this embodiment is substantially similar to the preceding in that with the electric motors separately powered, one pair of grippers can be driven in one direction and the other pair of grippers in the other direction, as in the aforedescribed case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Advancing Webs (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

A gripper feeder for metal stip comprising on a base: at least two grippers (10, 10') for engaging a metal strip (29) to be advanced, members for moving said grippers in a direction parallel to the axis of said strip, means for independently operating said grippers, a control centre for controlling said gripper mover members, characterised in that said mover members consist of at least two motors (4, 4'; 30, 30'), the operation of which is controlled in such a manner that when the gripper which retains the strip moves in one direction, the other gripper is deactivated and moves initially with greater speed in the opposite direction, then reverses its travel direction and reaches the speed of the first gripper, said first gripper slackening its grip when the second gripper intervenes to grip the strip.

Description

GRIPPER FEEDER FOR METAL STRIP.
This invention relates to a gripper feeder for metal strip. Metal strip feeders are known for those presses and machines in which the strip is subjected to particular predetermined operations. A known type of feeder comprises a pair of grippers for engaging the metal strip to be advanced, members for moving the grippers in a direction parallel to the axis of said strip and in the opposite direction, and means for independently operating said grippers such that while the gripper which moves in the direction of advancement of the strip is activated, that which moves in the opposite direction is deactivated.
In particular the mover members consist of a bar presenting two portions threaded in opposite directions which engage a threaded bush provided on a gripper of each pair, a motor being provided, powered alternately in the two directions of rotation. These known feeders have however the drawback of advancing the strip intermittently. This intermittent advancement is due on the one hand to the advancement pitch of the grippers and on the other hand to the operation pitch. In this respect, on the basis of an advancement pitch of 1 m and an operation pitch of 2.5 m, the advancement of the strip has to be halted every metre to allow "gripper changeover" and enable the strip to be halted every 2.5 m as required by the operating cycle.
According to the invention, this drawback is eliminated by a gripper feeder for metal strip as described in claim 1.
A preferred and a modified embodiment of the invention are described in detail hereinafter with reference to the accompanying drawings, in which: Figure 1 is a side view of a first embodiment of a gripper feeder according to the invention, Figure 2 is a cross-section therethrough on the line ll-ll of figure 1 , Figure 3 is a plan view thereof, Figure 4 is a plan view of a second embodiment, Figure 5 is a side view thereof.
As can be seen from the figures, the gripper feeder for metal strip according to the invention comprises, in the embodiment shown in Figures 1 to 3, a base 2 on which two linear motors 4, 4' are mounted. Each linear motor 4, 4' comprises a stator 6, 6' and a carriage 8, 8' supporting a gripper 10, 10'.
A single stator could also be used, on which the two carriages slide independently.
Each gripper 10, 10' comprises a fixed jaw 12, 12' rigid with the carriage 8, 8", and a movable jaw 14, 14' moved relative to the corresponding fixed jaw 12, 12' by a pneumatic actuator 16, 16' of vertical axis.
On the base there are also mounted transverse guides 16, along which carriages 20 slide supporting rollers 22 of vertical axis having in their lateral surface a groove for engaging and guiding the longitudinal edge of the metal strip to be advanced. The carriages 20 are moved along the respective guides by operating handwheels 26.
The invention also comprises a control centre for controlling the various constituent elements of the feeder, such as the pneumatic jaw actuator, the linear motors etc. The operation of the feeder in this embodiment is as follows: the machine is firstly adjusted to adapt it to the width of strip to be fed; this adjustment involves operating the actuators which control the distance between the grippers, and then the actuators which control the distance between the rollers 22. Having undergone this preliminary adjustment, the feeder is ready to operate, assuming that the initial configuration is that in which the carriages 8, 8' are as close together as possible, with the carriage 8 moving in the strip advancement direction, the jaws 12 and 14 closed to grip the strip, the carriage 8' moving in the opposite direction to the strip advancement direction, and the jaws 12', 14' open (see Figure 3). Following activation of the stator 6 the carriage 8 moves in the direction indicated by the arrow 27 in figure 3 with the carriage 8' moving at the same time in the direction indicated by the arrow 28 in the same figure, following activation of the stator 6".
Because of the presence of the two separate motors 4, 4' and the particular operating cycle set by the control centre, the two carriages can be advanced not only with different speeds but also with variable speed, so that while the carriage 8 always moves at constant speed towards its front end-of- travel position, the other carriage 8' moves at greater speed than the carriage 8 to reach its rear end-of travel position, then reverses its direction and attains the same advancement speed as the other carriage 8, then before this reaches its front end-of-travel position, i.e. before the jaws 12, 14 loosen their grip, it intervenes with its jaws 12', 14' to grip the metal strip and continue to advance it in a virtually continuous manner.
The carriage 8' operates in a like manner, in that after reaching its front end-of-travel position, it reverses its travel direction, attains the speed of the other carriage 8 and arranges its jaws to grip the metal strip. From the aforegoing it is apparent that the feeder of the invention presents numerous advantages, and in particular:
- it achieves high operating speed by eliminating the pause time for gripper changeover, - it is more reliable because of the presence of the linear motors, which result not only in a quiet machine but also in simpler construction as those guides which were previously required for carriage advancement are now incorporated into the motor.
In another embodiment (not shown in the drawings) two pairs of linear motors positioned side by side on each section are provided. This embodiment, of so-called "electric tree" type, is particularly advantageous for very wide strip.
In the embodiment shown in figure 4 the feeder comprises two electric motors 30, 30', the shafts of which are rigidly connected to two threaded rods 32, 32' engaging threaded bushes 34, 34' provided on carriages 36, 36' supporting the grippers 38, 38'.
The carriages are rigid with two slides 40, 40' slidable along longitudinal guide rails 42, 42'.
The operation of the feeder of this embodiment is substantially similar to the preceding in that with the electric motors separately powered, one pair of grippers can be driven in one direction and the other pair of grippers in the other direction, as in the aforedescribed case.

Claims

C L A I M S
1. A gripper feeder for metal strip comprising on a base:
- at least two grippers (10, 10') for engaging a metal strip (29) to be advanced, - members for moving said grippers in a direction parallel to the axis of said strip,
- means for independently operating said grippers,
- a control centre for controlling said gripper mover members, characterised in that said mover members consist of at least two motors (4, 4'; 30, 30'), the operation of which is controlled in such a manner that when the gripper which retains the strip moves in one direction, the other gripper is deactivated and moves initially with greater speed in the opposite direction, then reverses its travel direction and reaches the speed of the first gripper, said first gripper slackening its grip when the second gripper intervenes to grip the strip.
2. A feeder also claimed in claim 1 , characterised in that each gripper is mounted on a carriage (8, 8') slidable on a stator (6, 6') of a linear motor.
3. A feeder as claimed in claim 1 , characterised in that the two carriages (8, 8') of the two motors slide on a single stator.
4. A feeder as claimed in claim 1 , characterised in that said carriage is rigid with a threaded bush (34, 34') engagable by a threaded bar (32, 32') rigid with the shaft of the electric motor (30, 30').
5. A feeder as claimed in claim 4, characterised in that the bars present two portions threaded in opposite directions.
6. A feeder as claimed in claim 1 , characterised by comprising two pairs of motors positioned side by side.
PCT/EP2001/011866 2001-02-13 2001-10-15 Gripper feeder for metal strip Ceased WO2002064281A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01273715A EP1360020A1 (en) 2001-02-13 2001-10-15 Gripper feeder for metal strip

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE20010011 ITVE20010011A1 (en) 2001-02-13 2001-02-13 CLAMP FEEDER FOR SHEET METAL TAPES
ITVE2001A000011 2001-02-13

Publications (1)

Publication Number Publication Date
WO2002064281A1 true WO2002064281A1 (en) 2002-08-22

Family

ID=11461050

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/011866 Ceased WO2002064281A1 (en) 2001-02-13 2001-10-15 Gripper feeder for metal strip

Country Status (3)

Country Link
EP (1) EP1360020A1 (en)
IT (1) ITVE20010011A1 (en)
WO (1) WO2002064281A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749594A1 (en) * 2005-08-04 2007-02-07 Unimet GmbH Feeding device for punching and bending machines
JP2015147630A (en) * 2014-02-05 2015-08-20 双葉電子工業株式会社 Film transport device
CN114433670A (en) * 2022-01-26 2022-05-06 江苏红人实业股份有限公司 Automatic feeding device for bending display frame plate
CN114515790A (en) * 2022-02-23 2022-05-20 无锡工艺职业技术学院 Electronic components binding post shaping processingequipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147569A5 (en) * 1971-07-24 1973-03-09 Weingarten Ag Maschf
EP0282264A2 (en) * 1987-03-09 1988-09-14 Babcock-Hitachi Kabushiki Kaisha System for continuously producing plate-shaped catalysts
JPH09182925A (en) * 1995-12-28 1997-07-15 Amada Co Ltd Moving and positioning device of plate stock
DE19703878A1 (en) * 1996-05-06 1997-11-13 Bueltmann Monika Drawing appliance for long tubes e.t.c.
US5909835A (en) * 1993-12-30 1999-06-08 Dalcos S.R.L. Gripper feeder for metal strip
EP0938939A2 (en) * 1998-01-30 1999-09-01 Dallan S.R.L. Improved metal strip feeder
US6092709A (en) * 1998-04-06 2000-07-25 Red Bud Industries, Inc. Machine for advancing a sheet metal strip in measured increments

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147569A5 (en) * 1971-07-24 1973-03-09 Weingarten Ag Maschf
EP0282264A2 (en) * 1987-03-09 1988-09-14 Babcock-Hitachi Kabushiki Kaisha System for continuously producing plate-shaped catalysts
US5909835A (en) * 1993-12-30 1999-06-08 Dalcos S.R.L. Gripper feeder for metal strip
JPH09182925A (en) * 1995-12-28 1997-07-15 Amada Co Ltd Moving and positioning device of plate stock
DE19703878A1 (en) * 1996-05-06 1997-11-13 Bueltmann Monika Drawing appliance for long tubes e.t.c.
EP0938939A2 (en) * 1998-01-30 1999-09-01 Dallan S.R.L. Improved metal strip feeder
US6092709A (en) * 1998-04-06 2000-07-25 Red Bud Industries, Inc. Machine for advancing a sheet metal strip in measured increments

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 11 28 November 1997 (1997-11-28) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749594A1 (en) * 2005-08-04 2007-02-07 Unimet GmbH Feeding device for punching and bending machines
JP2015147630A (en) * 2014-02-05 2015-08-20 双葉電子工業株式会社 Film transport device
CN114433670A (en) * 2022-01-26 2022-05-06 江苏红人实业股份有限公司 Automatic feeding device for bending display frame plate
CN114433670B (en) * 2022-01-26 2023-09-15 江苏红人实业股份有限公司 Automatic feeding of processing is bent to show frame plate spare
CN114515790A (en) * 2022-02-23 2022-05-20 无锡工艺职业技术学院 Electronic components binding post shaping processingequipment

Also Published As

Publication number Publication date
EP1360020A1 (en) 2003-11-12
ITVE20010011A1 (en) 2002-08-13

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