EP0983840B1 - Presse mit Nockenantrieb - Google Patents

Presse mit Nockenantrieb Download PDF

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Publication number
EP0983840B1
EP0983840B1 EP99306877A EP99306877A EP0983840B1 EP 0983840 B1 EP0983840 B1 EP 0983840B1 EP 99306877 A EP99306877 A EP 99306877A EP 99306877 A EP99306877 A EP 99306877A EP 0983840 B1 EP0983840 B1 EP 0983840B1
Authority
EP
European Patent Office
Prior art keywords
cam
recess
cam follower
press according
follower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99306877A
Other languages
English (en)
French (fr)
Other versions
EP0983840A3 (de
EP0983840A2 (de
Inventor
Roger Harry Ketteringham
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.)
McKechnie UK Ltd
Original Assignee
McKechnie UK Ltd
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 McKechnie UK Ltd filed Critical McKechnie UK Ltd
Publication of EP0983840A2 publication Critical patent/EP0983840A2/de
Publication of EP0983840A3 publication Critical patent/EP0983840A3/de
Application granted granted Critical
Publication of EP0983840B1 publication Critical patent/EP0983840B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/285—Arrangements for preventing distortion of, or damage to, presses or parts thereof preventing a full press stroke if there is an obstruction in the working area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/261—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks by cams

Definitions

  • Invention relates to a press and in particular, but not exclusively, a press for installing bush type fasteners into substrates such as aperture sheet material for example for use in fastening components of an article along an assembly line.
  • a press for installing bush type fasteners into substrates such as aperture sheet material for example for use in fastening components of an article along an assembly line.
  • One of said presses is disclosed in WO 81 01871 A.
  • hydraulic presses suffer from various drawbacks including the requirement for a large storage tank for hydraulic fluids such as oil, slow speed of operation due to the build up of pressure before releasing the hydraulic ram, excessive noise, a large stroke or length of travel of the tool which has inherent safety problems, and difficulties in repair and maintenance. Also, hydraulic presses suffer from the drawback that the pressing tool is virtually under its full maximum load throughout its entire stroke which again provides inherent safety problems.
  • a press for installing bush type fasteners into substrates such as aperture sheet material comprising a cam follower operable to drive a pressing device such as a tool towards an operable pressing location, and a driven cam having a cam surface for effecting movement of the cam follower and a recess for receiving the cam follower within the cam.
  • the recess is preferably located between the leading and tailing edge of the cam surface and/or provides no camming action of its own.
  • the gravity location means comprises co-operating components associated with the cam follower and cam respectively, such as slider and slider guide.
  • the length of the recess is in the order of the diameter of the cam follower or greater.
  • the recess is in the order of 2 or more times the diameter of the cam follower.
  • the length of the recess is sufficient to enable alignment of the axis of rotation of the cam follower and the axis of rotation of the driven cam beneficially therefore to provide that if the cam is driven when the cam follower is in this stowed position, it does not effect movement of the cam follower and hence does not effect movement of the tool.
  • the eccentricity of the cam surface is less than 5 millimetres and more preferably in the order of less than 2 millimetres. Beneficially therefore the stroke of the tool under operable load is less than the thickness of a finger.
  • the cam is a rising cam with maximum eccentricity achieved at greater than 180° of rotation and preferably at about 270° of rotation.
  • the recess is relatively narrow and/or the annulus is located on the shaft so as to indicate the top dead centre position of the cam, or other preferred location for the removal of the cam follower from the recess, when the sensor detects the recess between the lobes.
  • the recess is in the order 10° of the circumference wide.
  • the lobe or lobes is/are in the order of 25 degrees of the circumference in width.
  • the means can be a ram such as a pneumatic ram.
  • Another aspect of the invention provides a fastener installing machine comprising one or more of the features of the press discussed above.
  • Another aspect of the invention provides a cam having a recess for receiving a cam follower.
  • a press 10 comprising a driven cam 12 and a cam follower 14.
  • Cam follower 14 is rotatably journalled in a bearing 16 which is attached to slider plate or plunger 18.
  • Slider plate 18 is received in a recess or guide forming part of a slider housing 20 which forms part of the main body of the press 10.
  • Slider plate 18 comprises means for attaching press tool thereto, and referring generally to Figure 1 it can be seen that the press 10 operates to enable sliding motion of tool 22 up and down (in the orientation shown) when cam 12 rotates to effect vertical movement of follower 14 and hence tool 22 thereby to effect pressing action on a fasteners (not shown) at an operable pressing location (also not shown) of the press 10.
  • press 10 comprises driven cam 12 which is attached to a drive shaft 30 which in turn is driven by a motor.
  • Shaft 30 is journalled in a housing 32 which is connected to guide housing 20 thereby forming the main body of press 10 fixedly attached to the shaft 30 is a lobed annulus 34 above which is positioned a sensor 36.
  • lobed annulus 34 comprises a pair of lobes 35 and 37 separated by a recess 38.
  • the circumferential length of lobes 35 and 37 in the order of 25 degrees and the length of recess 38 is in the order of 10 degrees. Accordingly, circumferential length between the leading and trailing edges of lobes 35 and 37 is in the order of 300 degrees.
  • press 10 further comprises position sensors 24 and 26 for detecting a shoulder 48 forming part of bearing 16.
  • the positional sensors 24 and 26 can for example be optical or inductive sensors.
  • the sensors are positioned at substantially the same axial position with respect to the axis of movement of follower 14 along its vertical path.
  • a ram 46 such as a pneumatic ram is provided which is attached at one end to the body and at the other end to bearing 16.
  • Ram 46 effects lifting of bearing 16 and cam follower 14 after a stroke.
  • a chuck or other receiving device 44 connected to slider plate 18, for receiving a tool 22.
  • cam 12 comprises a channelled recess 50 having a width slightly greater than the diameter of cam follower 14 and a length of approximately twice the diameter of cam follower 14 but wherein the curved end of the recess 50 is approximately the radius of cam follower 14 beyond the centre of rotation at bore 52. Further bores 54 are provided for locating the cam onto the end of drive shaft 30, for example using threaded bolts.
  • Cam 12 further comprises a cam surface 56 which extends from the radiused ends of channel 50 through approximately 300 degrees of the circumference of cam 12.
  • the cam surface is provided on the periphery of cam 12.
  • the eccentricity of the cam surface 56 is preferably rising in an anti-clockwise direction.
  • the maximum extent, or most eccentric region, of cam surface 56 is substantially at 90 degrees to axis A (or 270° to the start position).
  • the cam surface 56 can go through a local minimum at the upper edge along axis A shown in Figure 6.
  • Controller 60 can be a mini controller, microprocessor or other programmable device.
  • User controls are provided such as an on button 62, reset button 64, manual button 66, automatic button 68, and actuator button 70.
  • motor 72 for driving cam 12 via shaft 30 on instructions from controller 60.
  • motor 72 is a three phase motor which can be driven using a three phase inverter taking supply from single phase mains electricity for example. The use of such a three phase motor enables controller 60 to control the speed, acceleration and deceleration, direction and stopping point of the motor and hence cam 12.
  • Controller 60 is further operably in communication with sensor 30 for determining the orientation of cam 12 and with position sensors 24 and 26 for determining the location of cam follower 14. Controller 60 further operably activates a valve 74 allowing actuation of pneumatic ram 46 from a pressurised gas supply 76.
  • FIGS 8, 9 and 10 show the relative orientation of cam 12 and follower 14 throughout the operation of the press as now described.
  • cam follower 14 In its rest or stowed position, cam follower 14 is located substantially in axial alignment with drive shaft 30 and is held in position through the action of pneumatic ram 46.
  • the position of cam 12 shown in Figures 2 and 3 is the top dead centre position and is determined by controller 60 using sensor 36 which locates recess 38 between lobes 35 and 37.
  • sensor 36 which locates recess 38 between lobes 35 and 37.
  • actuation button 70 closes valve 74 and pneumatic ram 46 acts as a simple pneumatic damper allowing cam following 14 to move downwardly out of recess 50 in cam 12 under the weight of the cam follower 14, bearing 16, slider plate 18 and tool 22 for example.
  • Controller 60 interrogates sensors 24 and 26 to determine if they detect shoulder 48 of bearing 16 as it falls downwardly. If sensors 24 and 26 detect the shoulder within a predetermined time limit, such as less than 0.1 of a second and the sensors remain closed (or otherwise indicate the presence of shoulder 48 in a lowered position) then controller 62 actuates motor 72 effecting rotation of cam 12 in either a clockwise direction. Accordingly, by setting the length of tool 22 and other components accordingly, it is possible for tool 22 to be proximal the fastener as cam surface 56 engages cam follower 14 when the cam 12 begins to rotate.
  • a predetermined time limit such as less than 0.1 of a second and the sensors remain closed (or otherwise indicate the presence of shoulder 48 in a lowered position
  • cam 12 Movement of cam 12 through 360 degrees effects a vertical movement of cam follower 14 and hence tool 22 through the extent of eccentricity of the cam.
  • power is removed from shaft 30 by de-activating motor 72 and valve 74, having been opened at any stage after engagement of follower 14 with cam surface 56 during the rotation of the cam, effects movement of cam follower 14 back into recess 50 thereby clearing tool 22 away from the operable pressing location of the press.
  • controller 60 reduces the power of motor 72 at the beginning and end of the rotation of cam 12. This can be achieved by causing shaft 30 to rotate at a slower speed when sensor 36 detects either of lobes 36 or 37.
  • the operator When operated in this manual mode, the operator positions the substrate and fastener beneath the tool and then presses the actuation button 70 to recommence the release of follower 14 from recess 50 and so on. If an automatic fastener feeding mechanism is used the automatic mode button 68 can actuated and the operation controlled by controller 60 having means for ensuring the fastener is located beneath the tool before commencing the pressing cycle. Of course this mode can be run without an automatic feeder also.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Finger-Pressure Massage (AREA)
  • Automatic Assembly (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Mechanical Operated Clutches (AREA)

Claims (18)

  1. Presse (10) zum Einbringen von buchsenartigen Verbindungselementen in Substrate wie beispielsweise ein Lochplattenmaterial, mit einem Nockenstößel (14) zum Antreiben einer Pressvorrichtung wie beispielsweise eines Werkzeugs (22) zu einer Betriebspressstellung, und einem getriebenen Nocken (12) mit einer Nockenfläche (56) zum Bewirken einer Bewegung des Nockenstößels (14) und einer Ausnehmung (50) zum Aufnehmen des Nockenstößels (14) in dem Nocken (12),
    dadurch gekennzeichnet, dass die Nockenfläche (56) an dem Außenumfang des Nockens (12) ist, die Ausnehmung (50) an der Nockenfläche (56) positioniert ist und sich radial zu dem Mittelpunkt des Nockens erstreckt, und, wenn der Nockenstößel (14) in seiner Ruhe- oder Stauposition ist, der Nockenstößel in der Ausnehmung (50) unverschiebbar ist.
  2. Presse nach Anspruch 1, bei welcher die Ausnehmung zwischen der Vorder- und der Hinterkante der Nockenfläche positioniert ist, und die Ausnehmung bevorzugt selbst keine Nockenwirkung vorsieht.
  3. Presse nach Anspruch 1 oder 2, bei welcher der Hub des Nockenstößels etwa das Exzentrizitätsmaß der Nockenfläche ist.
  4. Presse nach einem der Ansprüche 1 bis 3, mit einer Einrichtung zum Ermöglichen einer Positionierung der Pressvorrichtung durch Schwerkraft an einer Position nahe einer der Betriebspressstellung und der Werkzeugposition, wobei der Nockenstößel im Wesentlichen aus der Ausnehmung in dem Nocken entfernt wird, und die Belastung auf das Werkzeug vor einem Einbringvorgang eines Befestigungselements bevorzugt im Wesentlichen gleich dem Gewicht des Werkzeugs und verbundener Komponenten wie beispielsweise dem Nockenstößel ist, und/oder die Schwerkraftpositioniereinrichtung zu dem Nockenstößel bzw. dem Nocken gehörende zusammenwirkende Komponenten aufweist, und/oder die Schwerkraftpositioniereinrichtung einen Schieber und eine Schieberführung aufweist.
  5. Presse nach einem der vorhergehenden Ansprüche, bei welcher die Länge der Ausnehmung in der Größenordnung des Durchmessers des Nockenstößels liegt.
  6. Presse nach einem der Ansprüche 1 bis 4, bei welcher die Länge der Ausnehmung größer als der Durchmesser des Nockenstößels ist, und die Länge der Ausnehmung bevorzugt in der Größenordnung des Zwei- oder Mehrfachen des Durchmessers des Nockenstößels liegt.
  7. Presse nach einem der vorhergehenden Ansprüche, bei welcher die Länge der Ausnehmung ausreichend ist, um eine Stauposition zu ermöglichen, in welcher eine wesentliche Ausrichtung der Drehachse des Nockenstößels und der Drehachse des getriebenen Nockens vorgesehen ist, sodass, wenn der Nocken angetrieben wird und sich der Nockenstößel in der Stauposition befindet, der Nocken keine ausreichende Bewegung des Nockenstößels bewirkt, um eine Bewegung des Werkzeugs zu bewirken.
  8. Presse nach einem der vorhergehenden Ansprüche, bei welcher die Exzentrizität der Nockenfläche geringer als 5 mm ist, und die Exzentrizität der Nockenfläche bevorzugt in der Größenordnung von weniger als 2 mm liegt.
  9. Presse nach einem der vorhergehenden Ansprüche, bei welcher der Nocken ein Steignocken mit einer bei einer Drehung von mehr als 180° erreichten maximalen Exzentrizität ist, und bei welcher die maximale Exzentrizität bevorzugt bei einer Drehung von etwa 270° erreicht wird.
  10. Presse nach einem der vorhergehenden Ansprüche, mit einem Positionssensor, der mit einer Steuerung zum Gewährleisten, dass der Nockenstößel im Wesentlichen aus der Ausnehmung entfernt wird, bevor eine Betätigung des getriebenen Nockens starten kann, in Verbindung steht, und bevorzugt mit zwei Positionssensoren, wobei die Steuerung einen Logiktest durchführt, um zu gewährleisten, dass beide Sensoren ein wesentliches Entfernen des Nockenstößels aus der Ausnehmung in einer vorbestimmten Zeitdauer erfassen, bevor eine Betätigung der getriebenen Nockenplatte stattfinden kann, und/oder bevorzugter die Sensoren zueinander benachbart positioniert sind, und/oder noch bevorzugter die Sensoren an im Wesentlichen der gleichen Achsenposition bezüglich der Bewegungsachse des Nockenstößels angeordnet sind.
  11. Presse nach Anspruch 10, bei welcher die vorbestimmte Zeit weniger als eine halbe Sekunde beträgt, und die vorbestimmte Zeit bevorzugt in der Größenordnung von 100 ms oder weniger liegt, und die vorbestimmte Zeit bevorzugter in der Größenordnung von 50 ms liegt.
  12. Presse nach Anspruch 10 oder 11, bei welcher die Steuerung mit einer solchen Logikfolge programmiert ist, dass eine Betätigung des betriebenen Nockens nur stattfindet, falls der erste und der zweite Sensor eine Bewegung des Nockenstößels im Wesentlichen aus der Ausnehmung in einer vorbestimmten Zeit voneinander erfassen, um dadurch eine Schaltung wie beispielsweise eine Änderung einer monostabilen Vorrichtung zu bewirken, und die Energie zu dem getriebenen Nocken nur andauert, solange beide Sensoren geschlossen sind und sich der Schalter oder die monostabile Vorrichtung in ihrem aktivierten Zustand befindet, und bei welcher bevorzugt die Energie zu dem getriebenen Nocken entfernt wird und der Schalter oder die monostabile Vorrichtung zurückgesetzt wird, sobald einer der Sensoren öffnet.
  13. Presse nach einem der vorhergehenden Ansprüche, mit einer Einrichtung zum Ausrichten der Nockenausnehmung in einer gewünschten Position, wie beispielsweise kopfüber, um dadurch einen Schwerkraftsvorschub des Nockenstößels und ein Pressen des Werkzeugs in eine untere Betriebsstellung zu ermöglichen, wobei die Ausrichtungseinrichtung bevorzugt einen gelappten Kreisring, der an der Antriebswelle des Nockens fest angebracht ist, und einen Sensor zum Erfassen der Position des Lappens um den Umfang des Kreisrings aufweist, und/oder bevorzugt der Sensor einen Induktionssensor aufweist und der Lappen einen radialen Metallvorsprung von dem Kreisring aufweist.
  14. Presse nach Anspruch 13, bei welcher zwei Lappen im Wesentlichen benachbart zueinander und durch eine Ausnehmung beabstandet vorgesehen sind, und die Ausnehmung bevorzugt relativ eng ist und/oder die Ausnehmung bevorzugt in der Größenordnung von 10° der Umfangsweite ist.
  15. Presse nach Anspruch 14, bei welcher der Kreisring so auf der Welle angeordnet ist, dass er die obere mittlere Totpunktstellung des Nockens oder eine andere bevorzugte Stellung zum Entfernen des Nockenstößels aus der Ausnehmung anzeigt, wenn der Sensor die Ausnehmung zwischen den Lappen erfasst.
  16. Presse nach einem der Ansprüche 13, 14 oder 15, bei welcher der oder die Lappen in der Größenordnung von 25° des Weitenumfangs ist/sind.
  17. Presse nach einem der vorhergehenden Ansprüche, mit einer Einrichtung zum Positionieren des Nockenstößels in der Ausnehmung, wie einen Kolben, wie beispielsweise einen Druckluftkolben.
  18. Befestigungselement-Einbringmaschine mit einer Presse nach einem der vorhergehenden Ansprüche.
EP99306877A 1998-09-05 1999-08-27 Presse mit Nockenantrieb Expired - Lifetime EP0983840B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9819301.4A GB9819301D0 (en) 1998-09-05 1998-09-05 Improvements in presses
GB9819301 1998-09-05

Publications (3)

Publication Number Publication Date
EP0983840A2 EP0983840A2 (de) 2000-03-08
EP0983840A3 EP0983840A3 (de) 2000-04-26
EP0983840B1 true EP0983840B1 (de) 2004-10-13

Family

ID=10838338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99306877A Expired - Lifetime EP0983840B1 (de) 1998-09-05 1999-08-27 Presse mit Nockenantrieb

Country Status (5)

Country Link
EP (1) EP0983840B1 (de)
AT (1) ATE279317T1 (de)
DE (1) DE69921052T2 (de)
ES (1) ES2234214T3 (de)
GB (2) GB9819301D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724101A1 (de) 2005-05-18 2006-11-22 Werner Dinkel Schutzeinrichtung für Presswerkzeuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000158194A (ja) * 1998-11-25 2000-06-13 Mti:Kk 溝カム機構及び溝カム機構を利用した安全装置を具備するプレス装置
EP2843779A1 (de) * 2013-09-03 2015-03-04 Exmore Group NV Crimppresse

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB603020A (en) * 1945-11-16 1948-06-08 Morgan Fairest Improvements in or relating to machines for applying handles to cutlery and similar articles
GB626146A (en) * 1947-01-21 1949-07-11 Giuseppe Cristina Device for fitting and removing cotters, keys, wedges, pins and the like, more particularly suitable for cotters of bicycle pedal cranks and chain link pins
DE2915328A1 (de) * 1979-04-14 1980-10-30 Prym Werke William Arbeitsmaschine mit fingerschutzeinrichtung fuer das bewegbare oberwerkzeug
GB2064049B (en) * 1979-11-23 1983-05-11 Horstmann Gear Group Ltd Slow rise quick drop mechanism
US4570500A (en) * 1979-12-31 1986-02-18 Richter Robert A Mechanism for controlling the operation of machines
FR2519581B1 (fr) * 1982-01-13 1986-11-21 Turquin Daniel Presse a demultiplication a came
DD217176A1 (de) * 1983-09-09 1985-01-09 Klaus Herold handbetriebene presse mit kurventrieb
US4750500A (en) * 1986-09-03 1988-06-14 Jerilyn Allen Device for facilitating hair styling using plural tints
US4924693A (en) * 1988-12-16 1990-05-15 Amp Incorporated RAM actuating mechanism in a press for terminating wires
DE19642204C2 (de) * 1996-10-12 1999-07-22 Telegaertner Geraetebau Gmbh Sicherheitseinrichtung an Umformmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724101A1 (de) 2005-05-18 2006-11-22 Werner Dinkel Schutzeinrichtung für Presswerkzeuge

Also Published As

Publication number Publication date
GB9920232D0 (en) 1999-10-27
ES2234214T3 (es) 2005-06-16
GB2341131A (en) 2000-03-08
DE69921052D1 (de) 2004-11-18
EP0983840A3 (de) 2000-04-26
GB9819301D0 (en) 1998-10-28
ATE279317T1 (de) 2004-10-15
EP0983840A2 (de) 2000-03-08
DE69921052T2 (de) 2006-03-02

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