US3440860A - Cyclic positioning mechanism - Google Patents
Cyclic positioning mechanism Download PDFInfo
- Publication number
- US3440860A US3440860A US565969A US3440860DA US3440860A US 3440860 A US3440860 A US 3440860A US 565969 A US565969 A US 565969A US 3440860D A US3440860D A US 3440860DA US 3440860 A US3440860 A US 3440860A
- Authority
- US
- United States
- Prior art keywords
- lever
- knock
- frame
- shaft
- die
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
Definitions
- a second lever is pivotal with respect to the frame and is operated upon by a drive means for pivoting the second lever and a third lever is pivoted to the frame and is in contact at opposite ends thereof with the first and second levers so that upon pivotal motion of the second lever the third lever moves said first lever to advance the knock-out pin.
- This invention relates to positioning mechanisms arranged to cyclically operate on a positionable member and more particularly relates to such mechanisms which ⁇ nay operate at relatively high speeds with reduced backash.
- Linkage mechanisms embodying the invention may be incorporated in many types of machines which cyclically operate to position a member which may be reciprocably moved in a guide means.
- An example of such member is the knock-out pin of a heading machine and the invention will be disclosed in such environment.
- Heading machines generally comprise a die member adapted to receive a workpiece in a die cavity, a gate carrying one or more punches adapted to form a portion of the workpiece, a knock-out mechanism arranged to knock the workpiece from the die cavity after a forming blow upon the workpiece and a transfer mechanism adapted to position a subsequent workpiece in or adjacent the die cavity prior to a subsequent stroke of the forming punch.
- the various mentioned mechanisms, the knock-out mechanisms, transfer mechanism and punch carrying gate are all operated in timed relation to effect a cycle of workpiece heading, knock-out and transfer. Such timing of the various mechanism is achieved through various elements, such as cams, connecting rods, levers, etc.
- the present invention provides a new and improved mechanism which may be utilized as a knock-out assembly for a heading machine and which decreases the clearance or backlash between the operating parts thereof to enable higher speed operation without undue loading due to impact and acceleration on the parts, and which further reduces the noise level during operation due to the decreased backlash.
- an object of this invention is to provide a new and improved motion transmitting mechanism having greatly reduced backlash.
- Another object of this invention is to provide a new and improved knock-out assembly for a heading machine.
- Another object of the invention is to provide a new and improved knock-out assembly for a heading machine which contributes to higher speed operation of the heading machine by reducing the backlash and clearance be tween the parts of the knock-out mechanism.
- a further object of this invention is to provide a new and improved knock-out assembly for a heading machine which eliminates backlash therein when a knockout cycle is initiated.
- a still further object of this invention is to provide a new and improved knock-out assembly for a heading machine which is easily adjustable to accommodate various size workpieces formed by the machine and the distance of the knock-out stroke without introducing backlash into the system.
- FIG. 1 is an elevation of a heading apparatus embodying the invention
- FIG. 2 is an end view of the apparatus of FIG. I seen from the right hand side thereof;
- FIG. 3 is a view, partially cut away, seen in the plane of line 33 of FIG. 2, and showing the knock-out assembly in a knock-out position;
- FIG. 4 is a view similar to FIG. 3 showing the knockout assembly in a relaxed position
- FIG. 5 is a view of another lever system embodying the invention.
- a heading apparatus in which the invention may be embodied is generally represented by the reference numeral 10 and comprises a base 11 having the frame 12 of the header mounted thereto.
- the apparatus includes a movable gate G carrying one or more punches arranged to act upon a workpiece in a die 62.
- a set of cams 13 and 14 which operate a workpiece knock-out assembly are mounted to a shaft 15 rotatably mounted to frame 12 by means of brackets 16. Shaft 15 is rotated in timed relation with the operation of the machine parts such as the punches, etc., in a manner well known to those skilled in the art.
- Cams 13 and 14 operate upon cam followers 17 and 18 rotatably mounted to a three-arm crank 19 which, in turn, is pivotally connected at 20 to a rod 21.
- cam 13 acts on follower 17 to pivot lever 19 counterclockwise about point 22 which extends rod 21 to the right, as viewed in FIG. 1.
- cam 14 acts on cam follower 18, lever 19 is pivoted clockwise and retracts rod 21.
- the knockout assembly is operated to knock-out a workpiece from a die.
- lever 19 is under the operation of cam 13, rod 21 is extended, and the knock-out assembly is turned to a relaxed position.
- the apparatus further comprises a drive pulley 23 mounted to a shaft 24 which is driven by a prime mover such as an electric motor, not shown, and all parts, including shaft 15, are operated in synchronism or timed relation to rotation of pulley 23 by means of suitable connecting devices.
- a prime mover such as an electric motor, not shown, and all parts, including shaft 15, are operated in synchronism or timed relation to rotation of pulley 23 by means of suitable connecting devices.
- cams 13 and 14 will be referred to merely as a knock-out cam whose function is to rock a crank 26 having arms 27 and 28 in fixed relation to each other on a shaft 29 carried by frame 12.
- the free end of arm 28 carries an adjustable link 30, as will hereinafter be explained.
- Each of the arms 27 and 28 is connected to sleeve portions 32 and 33 disposed about shaft 29 and joined to each other by means of a bolt at 34.
- Rod 21 is pivotally connected to one end of arm 27 by a pin 35.
- link 30 may comprise a threaded shaft 36 received in the end of arm 28 and carrying at one end thereof a camming member 37 which acts against a nose 38 of a drive lever 39 pivoted to a shaft 40 carried by frame 12. Also pivotally mounted about shaft 40 is a knock-out lever 41, having a nose portion 42.
- means are provided which may be adjusted to keep the backlash in the overall knock-out system to a minimum. This is highly desirable in high speed knock-out mechanisms, not only from the noise level but from the reduction of impact and acceleration load on the parts of the knock-out assembly.
- a plate-like member 43 is mounted to frame 12 as by means of bolts 44 and 45 and includes an elongated guide slot 46 therein which guidably receives a travelling member 47.
- Member 47 threadably engages a threaded shaft member 48 carried by member 43 so that upon rotation of shaft 48 member 47 will move axially along shaft 48 Within slot 46.
- member 47 may be locked to plate member 43 by means of nut 49 threaded to a stud portion 50 of member 47.
- Member 47 further carries a pivot-providing block member 51 which mounts a shaft 52. Pivotally mounted to shaft 52 is a rocker crank 53 having nose portions 54 and 55 arranged to engage drive lever 39 and knock-out lever 41 on either side of shaft 40.
- the position of shaft 52 may be varied along the length of shaft 48 within the confines of slot 46.
- An abutment stop for lever 41 is provided in the form of a bolt 56 threadably received in a nut-like member 57 in a bracket 57a on frame 12.
- Bolt 56 is locked in position by a lock nut 58.
- the end 59 of bolt 56 provides a stopping surface for knock-out lever 41 when it is rotated in the clockwise direction, and the position of bolt 56 in member 57 determines the limits of counterclockwise motion of knock-out lever 41.
- Nose 42 of knock-out lever 41 then engages and advances a plunger 60 in frame 12 to, in turn, advance a knock-out pin 61 in die 62 and knock-out a workpiece therein.
- knock-out lever 41 Movement of knock-out lever 41 to the position shown in FIG. 3 further advances a plunger 63 against the bias of a spring 64 so that when rod 21 is extended and link 30 withdrawn from drive lever 39, the energy stored in spring 64 will move knock-out lever 41 to itsrelaxed position as shown in FIG. 4.
- FIG. 4 the knock-out assembly is shown in the relaxed or retracted position, and further illustrates the range of backlash or clearance adjustment which may be achieved through the provision of rocker 53.
- the member 47 is adjusted to the right (as shown in FIG. 4) the travel of knock-out lever 41 between a retracted position and a knock-out position is decreased.
- This mechanism provides a very high degree of repeatability to a fixed point which is exemplified as the set position of plunger 60 (FIG. 3).
- lever 41 and, more specifically, contacting nose 42 thereof will always return to this fixed point at the end of the knock-out stroke. This is accomplished by predetermining the relationship of levers 39 and 41 so that in the full knock-out position the lever 41 is set to a point to which it always returns at the end of a knock-out stroke. This alleviates the problems presented by over or under travel of a knock-out lever and reduces wear, chatter and backlash of the parts.
- member 37 is located to set knock-out pin 61 at the face 62a of die 62 or, alternatively, the shoulder 61a of pin 61 is in engagement with die 62.
- a measured length of stock equivalent to that of a workpiece is inserted in die 62 against knock-out pin 61 and the knock-out stop bolt 56 is adjusted until it just touches knock-out lever 41.
- Nut 49 is then loosened and screw shaft 48 is turned to move member 47 and, more specifically, rocker lever 53 to a position to contact both knock-out lever 41 and drive lever 39, with knock-out lever 41 held against the stop.
- the drive lever 39 could be actuated by rotating the shaft to which it is attached.
- FIG. 5 Another embodiment of the invention is shown in FIG. 5 wherein a drive means in the form of a cam 70 is utilized to return a positioning lever 71 equivalent to the knock-out lever 41 to a retracted position.
- lever 71 normally acts upon a member 72 movable in a guide 73 in a frame 74.
- Lever 71 is pivoted to the frame at 75 and a drive lever 76 is pivoted to the frame at one end thereof at 77, and at the other end thereof pivotally carries a cam follower 78 which is driven by cam 70.
- Lever 71 is normally urged towards member 72 by means of a plunger 79 biased by a spring 80, and moves between the position shown, determined by an adjustable stop 81, and a position against face 81a.
- a rocker lever 82 is pivotally mounted to a block 83 which may be adjustably positioned in channel 84 on frame 74.
- adjustable rocker lever in both cases acts as a variable force multiplier dependent upon its position relative to the drive and positioning levers.
- a knockout pin operating assembly comprising first and second levers, said first and second levers having adjacent ends pivotally mounted to said frame member, said first lever being arranged to advance the pin into the die, said second lever being arranged to be pivoted by the connecting means, a third lever pivotally mounted to the frame intermediate the ends thereof, said third lever being in contact adjacent the ends thereof with said first lever and said second lever so that upon pivotal motion of said second lever by the connecting means said third lever moves said first lever to advance said pin.
- said guide means includes a threaded shaft, said member threadedly receiving said shaft and non-rotatably mounted to said guide means so that upon rotation of said shaft said member moves longitudinally along said shaft.
- a mechanism for knocking a workpiece from a die comprising a pin adapted to be inserted in the die, a frame member, first and second levers, said first and second levers having adjacent ends pivotally mounted to said frame member said first lever being arranged to advance said pin into the die, drive means for pivoting said second lever and a third lever pivotally mounted to the frame, said third lever being in contact at opposite ends thereof with said first lever and said second lever so that upon pivotal motion of said second lever said third lever moves said first lever to advance said pin.
- the mechanism of claim 8 further including means for adjusting the position of said third lever with respect to said first lever and said 'second lever.
- An apparatus for controlling the position of a member in a defined guide means comprising a frame member, first and second levers, said first lever being pivoted to said frame member at one end thereof, the other end of said first lever adapted to operate on said member, biasing means acting upon said first lever intermediate the ends thereof and arranged to pivot said first lever in a first direction, a second lever pivotally mounted to said frame member at one end thereof adjacent the pivoted end of said first lever, a third lever pivotally mounted intermediate the ends thereof to said frame and having its ends bearing on said first and second levers, and drive means for acting on the free end of said second lever to move said second lever about its pivot point and cause said third lever to produce pivotal motion of said first lever against the force of said biasing means.
- a variable stroke positioning apparatus with accurate repeatability to a fixed endpoint comprising a rigid member, a first lever pivoted at one end to said rigid member, the other end of said first lever adapted to operate on a point whose spatial relationship to said rigid member is fixed, a second lever pivotally mounted at one end to said rigid member adjacent the pivoted end of said first lever, a third lever pivotally mounted at a point intermediate its ends with respect to said rigid member, said third lever being spaced in relationship to said first and second levers so that the ends of said third lever bear against said first and second levers, and drive means for acting on the other end of said second lever to move said second lever about its pivot point and cause said third lever to produce pivotal motion of said first lever toward said fixed point.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Press Drives And Press Lines (AREA)
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US56596966A | 1966-07-18 | 1966-07-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3440860A true US3440860A (en) | 1969-04-29 |
Family
ID=24260879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US565969A Expired - Lifetime US3440860A (en) | 1966-07-18 | 1966-07-18 | Cyclic positioning mechanism |
Country Status (4)
Country | Link |
---|---|
US (1) | US3440860A (en) |
BE (1) | BE701511A (en) |
GB (1) | GB1136879A (en) |
SE (1) | SE354428B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3688322A (en) * | 1970-07-08 | 1972-09-05 | Nedschroef Octrooi Maats | Machine for upsetting bolts and similar articles |
EP0330914A1 (en) * | 1988-02-27 | 1989-09-06 | L. SCHULER GmbH | Device for ejecting work pieces from dies in a forming press |
CN103438144A (en) * | 2013-09-12 | 2013-12-11 | 上海海弋机电科技有限公司 | Transmission mechanism for bimetal composite contact cold heading machine |
US20140030374A1 (en) * | 2012-07-26 | 2014-01-30 | Techwin Opto-Electronics Co., Ltd. | Lever-type mold ejection mechanism of injection molding machine |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3112660A (en) * | 1960-02-09 | 1963-12-03 | Textron Ind Inc | Machine for forming metal articles |
US3157892A (en) * | 1960-02-01 | 1964-11-24 | Textron Ind Inc | Machine for forming metal articles |
US3158047A (en) * | 1959-07-06 | 1964-11-24 | Textron Ind Inc | Machine for making headed articles |
US3171144A (en) * | 1962-08-22 | 1965-03-02 | Nat Machinery Co | Knockout drive assembly |
US3238761A (en) * | 1963-03-07 | 1966-03-08 | Textron Inc | Machine for forming metal articles |
US3266071A (en) * | 1965-03-29 | 1966-08-16 | Hilgeland Fa Geb | Cam-controlled apparatus for throwing out the bolts from the counter punch of bolt presses or the like |
US3267500A (en) * | 1963-09-18 | 1966-08-23 | Nat Machinery Co | Apparatus for forming hollow articles |
US3299453A (en) * | 1963-12-13 | 1967-01-24 | Nedschroef Octrooi Maats | Upsetting machine with controllable ejector means for the manufacture of screws, bolts, bolt blanks and the like |
-
1966
- 1966-07-18 US US565969A patent/US3440860A/en not_active Expired - Lifetime
-
1967
- 1967-07-17 SE SE10601/67A patent/SE354428B/xx unknown
- 1967-07-18 GB GB33032/67A patent/GB1136879A/en not_active Expired
- 1967-07-18 BE BE701511D patent/BE701511A/xx unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3158047A (en) * | 1959-07-06 | 1964-11-24 | Textron Ind Inc | Machine for making headed articles |
US3157892A (en) * | 1960-02-01 | 1964-11-24 | Textron Ind Inc | Machine for forming metal articles |
US3112660A (en) * | 1960-02-09 | 1963-12-03 | Textron Ind Inc | Machine for forming metal articles |
US3171144A (en) * | 1962-08-22 | 1965-03-02 | Nat Machinery Co | Knockout drive assembly |
US3238761A (en) * | 1963-03-07 | 1966-03-08 | Textron Inc | Machine for forming metal articles |
US3267500A (en) * | 1963-09-18 | 1966-08-23 | Nat Machinery Co | Apparatus for forming hollow articles |
US3299453A (en) * | 1963-12-13 | 1967-01-24 | Nedschroef Octrooi Maats | Upsetting machine with controllable ejector means for the manufacture of screws, bolts, bolt blanks and the like |
US3266071A (en) * | 1965-03-29 | 1966-08-16 | Hilgeland Fa Geb | Cam-controlled apparatus for throwing out the bolts from the counter punch of bolt presses or the like |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3688322A (en) * | 1970-07-08 | 1972-09-05 | Nedschroef Octrooi Maats | Machine for upsetting bolts and similar articles |
US5067892A (en) * | 1988-02-24 | 1991-11-26 | L. Schuler Gmbh | Ejection device for ejecting a workpiece from a die in a forming press |
EP0330914A1 (en) * | 1988-02-27 | 1989-09-06 | L. SCHULER GmbH | Device for ejecting work pieces from dies in a forming press |
WO1993013893A1 (en) * | 1988-02-27 | 1993-07-22 | Oskar Rahn | Device for ejecting workpieces from matrices in a forming press |
US20140030374A1 (en) * | 2012-07-26 | 2014-01-30 | Techwin Opto-Electronics Co., Ltd. | Lever-type mold ejection mechanism of injection molding machine |
US8721323B2 (en) * | 2012-07-26 | 2014-05-13 | Techwin Opto-Electronics Co., Ltd. | Lever-type mold ejection mechanism of injection molding machine |
CN103438144A (en) * | 2013-09-12 | 2013-12-11 | 上海海弋机电科技有限公司 | Transmission mechanism for bimetal composite contact cold heading machine |
CN103438144B (en) * | 2013-09-12 | 2016-01-13 | 上海海弋机电科技有限公司 | Bimetal composite contact cold header driving mechanism |
Also Published As
Publication number | Publication date |
---|---|
BE701511A (en) | 1968-01-18 |
SE354428B (en) | 1973-03-12 |
DE1627639A1 (en) | 1971-08-05 |
GB1136879A (en) | 1968-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JONES & LAMSON MACHINE COMPANY, INC., A DE. CORP.;REEL/FRAME:005031/0442 Effective date: 19880802 |
|
AS | Assignment |
Owner name: JL MACHINE ACQUISITION CORP., C/O GOLDMAN FINANCIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JONES & LAMSON MACHINES COMPANY, INC.,;REEL/FRAME:005080/0699 Effective date: 19880802 |
|
AS | Assignment |
Owner name: JONES & LAMSON VERMONT CORP., 160 CLINTON ST., SPR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE;ASSIGNOR:JL MACHINE ACQUISITION CORP.;REEL/FRAME:005186/0166 Effective date: 19890427 |
|
AS | Assignment |
Owner name: GLENFED FINANCIAL CORP., TEXAS Free format text: SECURITY INTEREST;ASSIGNOR:JONES & LAMSON VERMONT CORP., A DE CORP.;REEL/FRAME:005092/0582 Effective date: 19890505 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE Free format text: SECURITY INTEREST;ASSIGNOR:JONES & LAMSON VERMONT CORP.;REEL/FRAME:005280/0130 Effective date: 19890614 Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, AS AGENT Free format text: SECURITY INTEREST;ASSIGNOR:JONES & LAMSON VERMONT CORP.;REEL/FRAME:005280/0047 Effective date: 19890614 |
|
AS | Assignment |
Owner name: CITICORP USA, INC., NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:JONES & LAMSON VERMONT CORP.;REEL/FRAME:007854/0461 Effective date: 19960228 |