EP1358952A2 - Overload protection for a finger in a press - Google Patents
Overload protection for a finger in a press Download PDFInfo
- Publication number
- EP1358952A2 EP1358952A2 EP03076302A EP03076302A EP1358952A2 EP 1358952 A2 EP1358952 A2 EP 1358952A2 EP 03076302 A EP03076302 A EP 03076302A EP 03076302 A EP03076302 A EP 03076302A EP 1358952 A2 EP1358952 A2 EP 1358952A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- finger
- overload protection
- press
- 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.)
- Granted
Links
Images
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 overload protection for a finger in a 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 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)
- Transmission Devices (AREA)
- Presses And Accessory Devices Thereof (AREA)
- Press Drives And Press Lines (AREA)
- Automatic Assembly (AREA)
Abstract
Description
- The present invention relates to overload protection for a finger in a press, which overload protection incorporates a spring-loaded ball.
- 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.
- 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. - 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.
-
- 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 aworkpiece 1 is shaped to become a finished article. Theworkpiece 1 is placed in the first station and is thereafter moved on step by step. The stepping movement is provided bybeams 3 which are preferably coupled mechanically to the movement of the press slide. Thesebeams 3 carryfingers 2 mounted by means offinger holders 4, with at least onefinger 2 perbeam 3. The stepping movement, i.e. the transfer between stations, is controlled, e.g. by means of an inductive sensor, so that theworkpiece 1 will be in the correct position in thefingers 2. The press stops immediately upon it being detected that theworkpiece 1 has reached an incorrect position, but this involves afinger 2 colliding with theworkpiece 1 before the press stops. - According to the preferred embodiment, the overload protection incorporates a
finger holder 4, afirst recess 6 in thefinger 2, asecond recess 8 in thefinger holder 4, a spring-loadedball 10, aspring 12 arranged in thesecond recess 8, and acover 14 arranged in thefinger holder 4. Thefinger 2 is arranged to slide in thefinger holder 4 in the axial direction A of thefinger 2 so that thefinger 2 is moved from its normal working position by a translation movement in the axial direction A of thefinger 2 when the overload protection is actuated by theworkpiece 1 which thefinger 2 is intended to move having reached an incorrect position in the press whereby thefinger 2 is subjected to a force acting in the axial direction A of thefinger 2. Thus if anyfinger 2 collides axially with theworkpiece 1, the spring-loadedball 10 is overloaded and releases its grip, resulting in the press stopping without damage to thefinger 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 theworkpiece 1 in a correct position in thefinger 2. The overload protection according to the preferred embodiment incorporates afinger holder 4, afirst recess 6 in thefinger 2, asecond recess 8 in thefinger holder 4, a spring-loadedball 10, aspring 12 arranged in thesecond recess 8, and acover 14 arranged in thefinger holder 4. Thefinger 2 is arranged to slide in thefinger holder 4 in the axial direction A of thefinger 2. When thefinger 2 is in its normal working position, the spring-loadedball 10 is situated at least partly in thefirst recess 6 in thefinger 2 and thereby locks the finger firmly in the finger's axial direction A. In this normal working position, thespring 12 and possibly also part of the spring-loadedball 10 are in thesecond recess 8. Thecover 14 retains the end of thespring 12 which is not the end nearest to the ball in thesecond 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 afinger holder 4, afirst recess 6 in thefinger 2, asecond recess 8 in thefinger holder 4, a spring-loadedball 10, aspring 12 arranged in thesecond recess 8, and acover 14 arranged in thefinger holder 4. Thefinger 2 is arranged to slide in thefinger holder 4 in the axial direction A of thefinger 2 so that thefinger 2 is moved from its normal working position (see Fig. 1) by a translation movement in the axial direction A of thefinger 2 when the overload protection is actuated by theworkpiece 1 which thefinger 2 is intended to move having reached an incorrect position in the press whereby thefinger 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-loadedball 10 springing out of thefirst recess 6 in thefinger 6 and into thesecond recess 8 and thereby releasing thefinger 2 in the axial direction A of thefinger 2. In this released position, thespring 12 and the spring-loadedball 10 are in thesecond recess 8. Thecover 14 retains the end of thespring 12 which is not the end nearest to the ball in thesecond recess 8. Thus if anyfinger 2 collides axially with theworkpiece 1, the spring-loadedball 10 is overloaded and releases its grip, resulting in the press stopping without damage to thefinger 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 abeam 3 in the press instead of in thefinger holder 4; thespring 12 intended to spring-load theball 10 being arranged in thefirst recess 6 in thefinger 2 instead of in the second recess 8 (in which case thecover 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 (8)
- Overload protection for a finger (2) in a press, which overload protection incorporates a finger holder (4), a first recess (6) in the finger (2), a second recess (8) and a spring-loaded ball (10), characterised in that 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 whereby the finger (2) is subjected to a force acting in the axial direction (A) of the finger (2).
- Overload protection according to claim 1, characterised in that the second recess (8) is arranged in the finger holder (4).
- Overload protection according to claim 1, characterised in that the second recess (8) is arranged in a beam (3) in the press.
- Overload protection according to any one of claims 1 to 3, characterised in that a spring (12) intended to spring-load the ball (10) is arranged in the second recess (8).
- Overload protection according to any one of claims 1 to 3, characterised in that a spring (12) intended to spring-load the ball (10) is arranged in the first recess (6) in the finger (2).
- Overload protection according to claim 4, characterised in that the overload protection further incorporates a cover (14) arranged in the finger holder (4).
- Overload protection according to claim 5, characterised in that the overload protection further incorporates a cover (14) arranged in the finger (2).
- A press, characterised in that it incorporates overload protection according to any one of claims 1 to 7.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SV201331 | 2002-05-03 | ||
SE0201331A SE0201331L (en) | 2002-05-03 | 2002-05-03 | Overload protection for finger press |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1358952A2 true EP1358952A2 (en) | 2003-11-05 |
EP1358952A3 EP1358952A3 (en) | 2003-11-26 |
EP1358952B1 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 (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011115269A1 (en) * | 2010-03-18 | 2011-09-22 | アイダエンジニアリング株式会社 | Breakage prevention mechanism for conveying device and conveying device using breakage prevention mechanism |
FR2984195A1 (en) * | 2011-12-15 | 2013-06-21 | Peugeot Citroen Automobiles Sa | Gripping device for use in transfer system utilized for transferring sheet parts of body of car from stamping press, has gripping unit connected with part by connection unit for guiding sliding in translation of gripping unit |
CN108214667A (en) * | 2017-12-15 | 2018-06-29 | 宁波英格塑料制品有限公司 | A kind of windscreen wiper automatic cutting equipment |
CN111168624A (en) * | 2020-02-22 | 2020-05-19 | 上海阿为特精密机械股份有限公司 | Small-size adjustable pressure machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102435694B1 (en) * | 2021-11-30 | 2022-08-23 | 김민창 | slide bar for press machine |
Citations (2)
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 |
-
2002
- 2002-05-03 SE SE0201331A patent/SE0201331L/en not_active IP Right Cessation
-
2003
- 2003-05-02 DE DE60321420T patent/DE60321420D1/en not_active Expired - Fee Related
- 2003-05-02 ES ES03076302T patent/ES2307868T3/en not_active Expired - Lifetime
- 2003-05-02 EP EP03076302A patent/EP1358952B1/en not_active Expired - Fee Related
Patent Citations (2)
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 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01, 29 January 1999 (1999-01-29) & JP 10 286639 A (AIDA ENG LTD), 27 October 1998 (1998-10-27) * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011115269A1 (en) * | 2010-03-18 | 2011-09-22 | アイダエンジニアリング株式会社 | Breakage prevention mechanism for conveying device and conveying device using breakage prevention mechanism |
JP2011194428A (en) * | 2010-03-18 | 2011-10-06 | Aida Engineering Ltd | Breakage preventing mechanism for transfer device, and transfer device using the same mechanism |
JP5537650B2 (en) * | 2010-03-18 | 2014-07-02 | アイダエンジニアリング株式会社 | Damage prevention mechanism of transfer device and transfer device using the same |
US8915348B2 (en) | 2010-03-18 | 2014-12-23 | Aida Engineering, Ltd. | Breakage prevention mechanism of a transfer apparatus and transfer apparatus use of the breakage prevention mechanism |
US9339861B2 (en) | 2010-03-18 | 2016-05-17 | Aida Engineering Co., Ltd. | Breakage prevention mechanism of transfer apparatus and transfer apparatus using thereof |
FR2984195A1 (en) * | 2011-12-15 | 2013-06-21 | Peugeot Citroen Automobiles Sa | Gripping device for use in transfer system utilized for transferring sheet parts of body of car from stamping press, has gripping unit connected with part by connection unit for guiding sliding in translation of gripping unit |
CN108214667A (en) * | 2017-12-15 | 2018-06-29 | 宁波英格塑料制品有限公司 | A kind of windscreen wiper automatic cutting equipment |
CN111168624A (en) * | 2020-02-22 | 2020-05-19 | 上海阿为特精密机械股份有限公司 | Small-size adjustable pressure machine |
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 |
Also Published As
Publication number | Publication date |
---|---|
EP1358952B1 (en) | 2008-06-04 |
SE521409C2 (en) | 2003-10-28 |
ES2307868T3 (en) | 2008-12-01 |
DE60321420D1 (en) | 2008-07-17 |
SE0201331D0 (en) | 2002-05-03 |
EP1358952A3 (en) | 2003-11-26 |
SE0201331L (en) | 2003-10-28 |
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