EP1358952B1 - Overload protection for a finger in a press - Google Patents

Overload protection for a finger in a press Download PDF

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Publication number
EP1358952B1
EP1358952B1 EP03076302A EP03076302A EP1358952B1 EP 1358952 B1 EP1358952 B1 EP 1358952B1 EP 03076302 A EP03076302 A EP 03076302A EP 03076302 A EP03076302 A EP 03076302A EP 1358952 B1 EP1358952 B1 EP 1358952B1
Authority
EP
European Patent Office
Prior art keywords
finger
press
overload protection
recess
spring
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 - Fee Related
Application number
EP03076302A
Other languages
German (de)
French (fr)
Other versions
EP1358952A2 (en
EP1358952A3 (en
Inventor
Ulf Salomonsson
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.)
Scania CV AB
Original Assignee
Scania CV AB
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 Scania CV AB filed Critical Scania CV AB
Publication of EP1358952A2 publication Critical patent/EP1358952A2/en
Publication of EP1358952A3 publication Critical patent/EP1358952A3/en
Application granted granted Critical
Publication of EP1358952B1 publication Critical patent/EP1358952B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
    • B21D43/055—Devices comprising a pair of longitudinally and laterally movable parallel transfer bars
    • 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
    • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass

Definitions

  • the present invention relates to a press with an overload protection mechanism for a finger in the press, which overload protection incorporates a spring-loaded ball.
  • a known practice in presses is to arrange overload protection for fingers.
  • One reason is to prevent finger damage when the workpiece which the finger is intended to move reaches an incorrect position in the press.
  • Another reason is to reduce the time taken to bring the finger back to its normal working position when the overload protection has been actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press which has resulted in the finger being moved from its normal working position.
  • JP 10286639 A An example of overload protection for a finger in a press, which overload protection incorporates a spring-loaded ball, is referred to in JP 10286639 A , which refers to overload protection which, when actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press, results in the finger being moved from its normal working position by a rotary movement about a screw arranged through the finger.
  • a problem with overload protection for a finger according to the aforesaid JP 10286639 A is that at finger change, e.g. when a pin-shaped finger is replaced by a bifurcate finger, the finger cannot be removed easily and quickly from the press without tool use.
  • overload protection for a finger in a press, which overload protection incorporates at least one finger holder (in which the finger is arranged to slide in the axial direction of the finger), a first recess in the finger, a second recess and a spring-loaded ball.
  • Overload protection incorporating the features stated in claim 1 affords the advantage that a finger being changed, e.g. when a pin-shaped finger is replaced by a bifurcate finger, can be removed easily and quickly from the press without tool use. It also affords the advantage of providing overload protection which is actuated, when the finger is subjected to a force acting in the axial direction of the finger, by the finger being moved from its normal working position during the execution of a translation movement in the finger holder in the axial direction of the finger when the overload protection is actuated. Damage to the finger and other equipment is thereby prevented when the workpiece which the finger is intended to move reaches an incorrect position in the press.
  • a further advantage is a reduction in the time taken to bring the finger back to its normal working position when the overload protection has been actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press which results in the finger having been moved from its normal working position. The time spent in dealing with production disturbances due to the workpiece which the finger is intended to move having reached an incorrect position in the press is thus reduced.
  • the present invention relates to overload protection for a finger 2 in a press.
  • the press according to the invention may, for example, be a transfer press or step-by-step press with, for example, four stations whereby a workpiece 1 is shaped to become a finished article.
  • the workpiece 1 is placed in the first station and is thereafter moved on step by step.
  • the stepping movement is provided by beams 3 which are preferably coupled mechanically to the movement of the press slide.
  • These beams 3 carry fingers 2 mounted by means of finger holders 4, with at least one finger 2 per beam 3.
  • the stepping movement i.e. the transfer between stations, is controlled, e.g. by means of an inductive sensor, so that the workpiece 1 will be in the correct position in the fingers 2.
  • the press stops immediately upon it being detected that the workpiece 1 has reached an incorrect position, but this involves a finger 2 colliding with the workpiece 1 before the press stops.
  • the overload protection incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4.
  • the finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2 so that the finger 2 is moved from its normal working position by a translation movement in the axial direction A of the finger 2 when the overload protection is actuated by the workpiece 1 which the finger 2 is intended to move having reached an incorrect position in the press whereby the finger 2 is subjected to a force acting in the axial direction A of the finger 2.
  • the spring-loaded ball 10 is overloaded and releases its grip, resulting in the press stopping without damage to the finger 2.
  • Figure 1 depicts schematically a section of an overload protection according to a preferred embodiment of the invention, with the finger 2 in its normal working position and the workpiece 1 in a correct position in the finger 2.
  • the overload protection according to the preferred embodiment incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4.
  • the finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2.
  • the spring-loaded ball 10 When the finger 2 is in its normal working position, the spring-loaded ball 10 is situated at least partly in the first recess 6 in the finger 2 and thereby locks the finger firmly in the finger's axial direction A. In this normal working position, the spring 12 and possibly also part of the spring-loaded ball 10 are in the second recess 8. The cover 14 retains the end of the spring 12 which is not the end nearest to the ball in the second recess 8.
  • Figure 2 depicts schematically a section of an overload protection according to a preferred embodiment of the invention when the overload protection has been actuated and the finger 2 has been moved from its normal working position.
  • the overload protection incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4.
  • the finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2 so that the finger 2 is moved from its normal working position (see Fig.
  • the overload protection is actuated by the spring-loaded ball 10 springing out of the first recess 6 in the finger 6 and into the second recess 8 and thereby releasing the finger 2 in the axial direction A of the finger 2.
  • the spring 12 and the spring-loaded ball 10 are in the second recess 8.
  • the cover 14 retains the end of the spring 12 which is not the end nearest to the ball in the second recess 8.
  • the scope of the invention is not limited to the preferred embodiment alone but is determined by the claims set out below.
  • the second recess 8 being arranged in a beam 3 in the press instead of in the finger holder 4;
  • the spring 12 intended to spring-load the ball 10 being arranged in the first recess 6 in the finger 2 instead of in the second recess 8 (in which case the cover 14 is also arranged in the finger 2);
  • the workpiece which is handled by the press being, for example, a piece of sheetmetal;
  • the finger being of a different design, e.g. possibly provided with gripper or having the shape of a pin or a fork.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Automatic Assembly (AREA)
  • Press Drives And Press Lines (AREA)
  • Transmission Devices (AREA)

Description

    Technical field
  • The present invention relates to a press with an overload protection mechanism for a finger in the press, which overload protection incorporates a spring-loaded ball.
    • Background
  • A known practice in presses, e.g. transfer presses, is to arrange overload protection for fingers. One reason is to prevent finger damage when the workpiece which the finger is intended to move reaches an incorrect position in the press. Another reason is to reduce the time taken to bring the finger back to its normal working position when the overload protection has been actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press which has resulted in the finger being moved from its normal working position.
  • An example of overload protection for a finger in a press, which overload protection incorporates a spring-loaded ball, is referred to in JP 10286639 A , which refers to overload protection which, when actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press, results in the finger being moved from its normal working position by a rotary movement about a screw arranged through the finger.
  • A problem with overload protection for a finger according to the aforesaid JP 10286639 A is that at finger change, e.g. when a pin-shaped finger is replaced by a bifurcate finger, the finger cannot be removed easily and quickly from the press without tool use.
    • Brief description of the invention
  • The problem of it being impossible for a finger being changed to be removed easily and quickly from the press without tool use is solved according to the invention by arranging overload protection for a finger in a press, which overload protection incorporates at least one finger holder (in which the finger is arranged to slide in the axial direction of the finger), a first recess in the finger, a second recess and a spring-loaded ball.
  • Overload protection incorporating the features stated in claim 1 affords the advantage that a finger being changed, e.g. when a pin-shaped finger is replaced by a bifurcate finger, can be removed easily and quickly from the press without tool use. It also affords the advantage of providing overload protection which is actuated, when the finger is subjected to a force acting in the axial direction of the finger, by the finger being moved from its normal working position during the execution of a translation movement in the finger holder in the axial direction of the finger when the overload protection is actuated. Damage to the finger and other equipment is thereby prevented when the workpiece which the finger is intended to move reaches an incorrect position in the press. A further advantage is a reduction in the time taken to bring the finger back to its normal working position when the overload protection has been actuated by the workpiece which the finger is intended to move having reached an incorrect position in the press which results in the finger having been moved from its normal working position. The time spent in dealing with production disturbances due to the workpiece which the finger is intended to move having reached an incorrect position in the press is thus reduced.
    • Brief list of drawings
  • The invention is explained in more detail below with reference to the attached drawings, in which:
    • Figure 1 depicts schematically a section of an overload protection according to a preferred embodiment of the invention, with the finger in its normal working position.
    • Figure 2 depicts schematically a section of an overload protection according to a preferred embodiment of the invention when the overload protection has been actuated and the finger has been moved from its normal working position.
    Description of preferred embodiments
  • The present invention relates to overload protection for a finger 2 in a press. The press according to the invention may, for example, be a transfer press or step-by-step press with, for example, four stations whereby a workpiece 1 is shaped to become a finished article. The workpiece 1 is placed in the first station and is thereafter moved on step by step. The stepping movement is provided by beams 3 which are preferably coupled mechanically to the movement of the press slide. These beams 3 carry fingers 2 mounted by means of finger holders 4, with at least one finger 2 per beam 3. The stepping movement, i.e. the transfer between stations, is controlled, e.g. by means of an inductive sensor, so that the workpiece 1 will be in the correct position in the fingers 2. The press stops immediately upon it being detected that the workpiece 1 has reached an incorrect position, but this involves a finger 2 colliding with the workpiece 1 before the press stops.
  • According to the preferred embodiment, the overload protection incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4. The finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2 so that the finger 2 is moved from its normal working position by a translation movement in the axial direction A of the finger 2 when the overload protection is actuated by the workpiece 1 which the finger 2 is intended to move having reached an incorrect position in the press whereby the finger 2 is subjected to a force acting in the axial direction A of the finger 2. Thus if any finger 2 collides axially with the workpiece 1, the spring-loaded ball 10 is overloaded and releases its grip, resulting in the press stopping without damage to the finger 2.
  • The same reference notations are used throughout for the same features in the respective drawings.
  • Figure 1 depicts schematically a section of an overload protection according to a preferred embodiment of the invention, with the finger 2 in its normal working position and the workpiece 1 in a correct position in the finger 2. The overload protection according to the preferred embodiment incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4. The finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2. When the finger 2 is in its normal working position, the spring-loaded ball 10 is situated at least partly in the first recess 6 in the finger 2 and thereby locks the finger firmly in the finger's axial direction A. In this normal working position, the spring 12 and possibly also part of the spring-loaded ball 10 are in the second recess 8. The cover 14 retains the end of the spring 12 which is not the end nearest to the ball in the second recess 8.
  • Figure 2 depicts schematically a section of an overload protection according to a preferred embodiment of the invention when the overload protection has been actuated and the finger 2 has been moved from its normal working position. According to the preferred embodiment, the overload protection incorporates a finger holder 4, a first recess 6 in the finger 2, a second recess 8 in the finger holder 4, a spring-loaded ball 10, a spring 12 arranged in the second recess 8, and a cover 14 arranged in the finger holder 4. The finger 2 is arranged to slide in the finger holder 4 in the axial direction A of the finger 2 so that the finger 2 is moved from its normal working position (see Fig. 1) by a translation movement in the axial direction A of the finger 2 when the overload protection is actuated by the workpiece 1 which the finger 2 is intended to move having reached an incorrect position in the press whereby the finger 2 is subjected to a force acting in the axial direction A of the finger 2 (see Fig. 2). The overload protection is actuated by the spring-loaded ball 10 springing out of the first recess 6 in the finger 6 and into the second recess 8 and thereby releasing the finger 2 in the axial direction A of the finger 2. In this released position, the spring 12 and the spring-loaded ball 10 are in the second recess 8. The cover 14 retains the end of the spring 12 which is not the end nearest to the ball in the second recess 8. Thus if any finger 2 collides axially with the workpiece 1, the spring-loaded ball 10 is overloaded and releases its grip, resulting in the press stopping without damage to the finger 2.
  • The scope of the invention is not limited to the preferred embodiment alone but is determined by the claims set out below. The following, for example, are thus possible: the second recess 8 being arranged in a beam 3 in the press instead of in the finger holder 4; the spring 12 intended to spring-load the ball 10 being arranged in the first recess 6 in the finger 2 instead of in the second recess 8 (in which case the cover 14 is also arranged in the finger 2); the workpiece which is handled by the press being, for example, a piece of sheetmetal; the finger being of a different design, e.g. possibly provided with gripper or having the shape of a pin or a fork.

Claims (3)

  1. Press that incorporates an overload protection mechanism, said mechanism incorporates a finger holder (4), a first recess (6) in a finger (2), a second recess (8) and a spring-loaded ball (10), characterised in that the second recess (8) is arranged in the finger holder (4) or in a beam (3) in the press, a spring (12) intended to spring-load the ball (10) is arranged in the first or second recess (8) and the finger (2) is arranged to slide in the finger holder (4) in the axial direction (A) of the finger (2) so that the finger (2) is movable from its normal working position by a translation movement in the finger holder (4) in the axial direction (A) of the finger (2) when the overload protection is actuated by the workpiece (1) which the finger (2) is intended to move having reached an incorrect position in the press and collides axially with the finger (2), whereby the spring-loaded ball is over-loaded and the finger (2) is subjected to a force acting in the axial direction (A) of the finger (2).
  2. Press according to claim 1, characterised in that the overload protection further incorporates a cover (14) arranged in the finger holder (4).
  3. Press according to claim 1, characterised in that the overload protection further incorporates a cover (14) arranged in the finger (2).
EP03076302A 2002-05-03 2003-05-02 Overload protection for a finger in a press Expired - Fee Related EP1358952B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0201331A SE0201331L (en) 2002-05-03 2002-05-03 Overload protection for finger press
SV201331 2002-05-03

Publications (3)

Publication Number Publication Date
EP1358952A2 EP1358952A2 (en) 2003-11-05
EP1358952A3 EP1358952A3 (en) 2003-11-26
EP1358952B1 true EP1358952B1 (en) 2008-06-04

Family

ID=20287750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03076302A Expired - Fee Related EP1358952B1 (en) 2002-05-03 2003-05-02 Overload protection for a finger in a press

Country Status (4)

Country Link
EP (1) EP1358952B1 (en)
DE (1) DE60321420D1 (en)
ES (1) ES2307868T3 (en)
SE (1) SE0201331L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102435694B1 (en) * 2021-11-30 2022-08-23 김민창 slide bar for press machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011194428A (en) 2010-03-18 2011-10-06 Aida Engineering Ltd Breakage preventing mechanism for transfer device, and transfer device using the same mechanism
FR2984195B1 (en) * 2011-12-15 2014-07-18 Peugeot Citroen Automobiles Sa SELF-ADJUSTABLE GRIPPER APPARATUS FOR TRANSFERRING A WORKPIECE TO A BRAKE PRESS LINE
CN108214667B (en) * 2017-12-15 2020-04-28 宁波英格塑料制品有限公司 Automatic wiper punching equipment
CN111168624B (en) * 2020-02-22 2024-05-17 上海阿为特精密机械股份有限公司 Small-size adjustable press

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756425A (en) * 1971-03-08 1973-09-04 B Wallis Transfer device
JPH10286639A (en) * 1997-04-15 1998-10-27 Aida Eng Ltd Feed bar for transfer feed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102435694B1 (en) * 2021-11-30 2022-08-23 김민창 slide bar for press machine

Also Published As

Publication number Publication date
SE0201331D0 (en) 2002-05-03
SE521409C2 (en) 2003-10-28
SE0201331L (en) 2003-10-28
ES2307868T3 (en) 2008-12-01
EP1358952A2 (en) 2003-11-05
DE60321420D1 (en) 2008-07-17
EP1358952A3 (en) 2003-11-26

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