CA1260882A - Fused eyeletting machine - Google Patents
Fused eyeletting machineInfo
- Publication number
- CA1260882A CA1260882A CA000496978A CA496978A CA1260882A CA 1260882 A CA1260882 A CA 1260882A CA 000496978 A CA000496978 A CA 000496978A CA 496978 A CA496978 A CA 496978A CA 1260882 A CA1260882 A CA 1260882A
- Authority
- CA
- Canada
- Prior art keywords
- tool
- machine according
- support
- work
- piece
- 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
Links
- 238000007864 suspending Methods 0.000 claims description 12
- 229920002457 flexible plastic Polymers 0.000 claims description 3
- 230000000332 continued effect Effects 0.000 claims 1
- 239000012212 insulator Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
- H01R43/048—Crimping apparatus or processes
- H01R43/0484—Crimping apparatus or processes for eyelet contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
- H01R43/205—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve with a panel or printed circuit board
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4046—Through-connections; Vertical interconnect access [VIA] connections using auxiliary conductive elements, e.g. metallic spheres, eyelets, pieces of wire
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
- Supply And Installment Of Electrical Components (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
IMPROVED FUSED EYELETTING MACHINE
ABSTRACT
A machine for setting eyelets and the like in printed circuit boards includes a generally U-shaped frame having a pair of spaced-apart support arms defining a work-piece receiving zone therebetween, a first tool movably mounted in one of the support arms, and a second tool fixedly mounted in the other support arm and axially aligned with the first tool. An adjustable torque screw is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre-determined eyelet setting pressure.
The adjustable torque screw insures that the eyelet setting pressure does not exceed the pre-determined eyelet setting pressure despite continued rotation of the adjustable torque screw.
ABSTRACT
A machine for setting eyelets and the like in printed circuit boards includes a generally U-shaped frame having a pair of spaced-apart support arms defining a work-piece receiving zone therebetween, a first tool movably mounted in one of the support arms, and a second tool fixedly mounted in the other support arm and axially aligned with the first tool. An adjustable torque screw is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre-determined eyelet setting pressure.
The adjustable torque screw insures that the eyelet setting pressure does not exceed the pre-determined eyelet setting pressure despite continued rotation of the adjustable torque screw.
Description
~Z6~8~
The present inven-tion relates to an eyeletting machine, and more par-ticularly to a manually actuated fused eyele-tting machine capable of cold and Eused setting of eyelets and funnelets to printed circuit boards.
~CKGROUND OF T~IE IN~-ENTION
. . .
The present invention constitlltes an improvement over the fused eyeletting machines disclosed in IJnited States Patents 3,739,141; 3,940,590 and 4,584,460.
United States patent 3,739,141 discloses a fused eyeletting machine having a C-shaped frame, with the upPer arm oE
the -frame housing an upper tool, and the lower arm housing a resilient support structure for a lower tool which enables -the eyelet setting pressure to be pre-determined. The upPer tool is brought into contact with the lower -tool by means of a toggle arrangement which is ~ivoted to the upPer arm oE the frame.
United States Paten-t 3,940,590 describes an improved version of the machine disclosed in '141 patent. In the machine described in the '590 patent, the upper arm of the C-shaped frame terminates in a pair of spaced-apart tool support members, and a double stop toggle mechanism is mounted between those support members for actuating movement of the upper tool with respect to the lower tool.
United States patent 4,584,4~0 describes a further improved fused eyeletting machine which utilizes a novel and simPlified support structure for resilien-tly biasing the lower tool -to exert a pre-determined force ~,~,;.
~Z~ 32 against which the upper tool acts during the eyelet setting operation. As Wit]l the machines described in the '141 and '590 V.S. patents, the upper tool is actuated by means of a toggle arrangement.
One of the disadvantages associated with the structures described above arises from the use of a toggle arrangement for actuating movement of one of the tools towards and away from the other tool. In those toggle arrangements, the s-tro~e length is fi~ed so that difficulties in operation sometimes arise when boards of different thicknesses or eyelets of different lengths are utilized. These difficulties arise es-pecially in the circuit board repair industry where circuit boards and eyelets of various thicknesses and lengths are encountered. In light of this, care must be taken by the machine operator in each eyelet setting operation to achieve the desired eyelet setting and fusing on the board without crushing the board or dis-torting the eyelets.
A further problem which arises from the use of toggle actuating arrangements is that most toggle mechanisms are manufactured according to low tolerance specifications, so that difficulties are encountered in achieving accurate and repeatable alignment of the upper and lower tools each time the toggle arrange-ment is used. This, in turn, gives rise to possible dis-tortion of the eyelets as they are pressed into contact with the board prior to fusing, which in turn impairs the quality of the fused eyelet.
It is therefore a primary object of the present invention to provide an improved eyeletting machine capable of use with equal facility on eyelets and funnelets of different sizes and on printed circuit boards of different thicknesses.
It is another object of the present invention to ~6~ 32 provide an eyeletting machlne which utilizes a novel and simplified tool moving arrangement whereby the eyelet setting tools are brought into aligned contact with each other at a pre-determined eyelet setting pressure, which pressure can not be exceeaed despite continued operation of the tool moving arrangement after the pre-determined pressure has been reached.
SUI~l~ARY OF THE INVENTION
According to one aspect of the present invention, there is provided a machine for setting eyelets and the like, compr:ising a generally U-shaped frame having a pair of spaced-apart support arms defining a work-piece receiving zone therebetween. A first tool is movably mounted in one of the support arms, and a second tool is fixedly mounted in the other of the support arms so that the second tool is axially opposed to the first tool. A tool moving means is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre--determined eyelet setting pressure, with the tool moving means including an adjustable torque limiting means for insuring that the pre-determined eyelet setting pressure is not exceeded upon continued operation of the tool moving means.
According to another aspect of the present invention, there is provided a work-piece suspending arrangement for vertically suspending the work-piece into the work--piece receiving zone between the support arm of the U~shaped frame. This arrangement enables the work-piece to be suspended vertically next to the first and second tools, and leaves the operator free to finally position the work-piece relative to the first and second tools while actuating the tool moving means to bring the first tool into contact with the eyelet to be fused in the work-piece.
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BRIEF DESCRIPTION OF THE DRAWINGS
. _ .
The invention will now be described in more detail with reference to the accompanying drawings, in which:
Figure 1 is a side perspective view of the machine of the present invention;
Figure 2 is a partial cross-sectional view taken along the line 2-2 of Figure l;
Figure 3 is a partial cross-sectional view of an alternative embodiment;
Figure 4 is an enlarged cross-sectional view of a printed circuit board and an eyelet being set therein.
DETAILED DESCRIPTION OF THE INVE~TION
Referring to Figure 1, there is shown a machine, generally referenced 10, for setting eyelets and the like in printed circuit boards. The machine 10 has a U-shaped frame 12 which is suitably a cast frame. The frame has a pair of spaced-apart support arms 14, 16 connected by a base section 18. The base section 18 is preferably provided with feet members 20 which support the frame, and also enable the machine to be secured to a work table through apertures 22.
Mounted on the opposing support arms 14~ 16 of the frame is a first tool 24 and a second tool 26. The firs-t tool 24 is heid in a mandrel 28 which is movably supported in a first tool support structure 30, and the second tool 26 is fixedly mounted in a second tool support structure 32. As shown in Figure 2, the upper portion of the support arm 14 terminates in a pair of spaced-apart tool support posts 34, 36. The support post 34 houses the first tool support structure 30, and the support post 36 supports an adjustable torque ~Z6~3~%
screw 38, which is described in more detail below.
Referring to the first tool support structure 30, the mandrel 28 is slidably housed inside a cylindrical support member 40 which, together with an annular insulator ~ushing 42, is press fitted in a cy]indrical aperture 44 in the support post 34. End 46 of the mandrel 28 has a threaded portion 48 having thereon a pair of nuts 50, 52, and an electrical cable 54 is secured between the nuts. It will be seen, therefore, that the principal purpose of the annular insulator bushing 42 is to electrically insulate the cable 54 from post 34 and frame 12.
The adjustable torque screw 38, which is supported in the support post 36, includes a shaft 56 having a threaded portion 58 and an unthreaded portion 60. The threaded portion 58 is threadably received in a threaded aperture 62 in the post 36, and the threaded aperture 62 is positioned in post 36 such that the shaft 56 and the mandxel 28 are axially aligned with each other, as shown in Figure 2. The adjustable torque screw 38 has a handle 64 with an adjustable torque mechanism 66 pro- -vided internally of the handle, and rnay be of the type supplied by Jergens, Inc. of Cleveland, Ohio, U.S.A.
The handle is fixedly mounted to the threaded portion 58, so that rotation of the handle results in rotation of the shaft 56. A swivel pad 60 is mounted on the remote end of the unthreaded portion 60, and a stop clip 70 is mounted on the shaft 56 in a region of reduced diameter between the unthreaded portion 60 and the swivel pad 68. A piece of flexible plastic tubing 72 is stretch fitted over the swivel pad 68 and end 46 of the mandrel 28 between nut 52 and stop clip 70 in order to connect the mandrel 2g and the adjustable torque screw 38 together. The significance of this connection is discussed in more detail below. In order to further insure complete insulation between the frame 12 and the ~2~i~3138~
electric cable 54, an insulating ring 76 is provided between the nut 50 and the annular insulator bushing 42, and an i.nsulating pad 78 is provided on section 80 extenaing between support posts 34 and 36.
As will be seen from Figure 2, the upper portion of support arm 16 has an upstanding support member 82 with a cylindrical aperture 84 extending therethrough.
The second tool support structure 32 includes a support mandrel 84 which fixedly houses the second tool 26 at one end 86. End-94 of the support mandrel 84 is threaded and is provided with a pair of nuts 88 and 90 with an electric cable clamped therebetween.The support mandrel 84 is received in a cylindrical insulator bushing 96 wliich is press fitted in a cylindrical aperture 98 in the upstanding support member 82. A
portion of enlarged diameter 100 is provided on the support mandrel 84 which abuts against the insulator bushing 96 so that the support mandrel 84 can be firmly mounted in the cylindrical insulator bushing 96 upon tightening of the nuts 88, 90. A support plate 102 may be provided as shown in Figure 2 to provide additional support for the second tool support structure 32.
Figures 1 and 2 also show a work-piece suspending arrangement 104 which consists essentially of an L-shaped member 106 and an adjusting arm 108 which telescopingly receivable within the L-shaped member 106. As shown in Figure 1, a support means, for example a clip 110, '-is provided on the end of the adjusting arm 108 for vertically suspending a work-piece 112, typically a circuit board, into the region between the support arms 14, 16 and close to the first and second tools 24, 26. Positioning of the circult board 112 is accomplished by telescopingly moving the adjusting arm 108 inside the L-shaped member, and when the desired position has been reached, the adjusting al~ 108 can be fixed in that position by means of screw member 114. As illustrated, the suspending arrangernent 104 is mounted on the support post 34, but could also be mounted elsewhere on the machine, for example, on the upstanding support member 82. In addition, the suspending arrangement 104 may be mounted i.n the support post 34 so that it can be rotated about the axis of the vertical upstanding portion 107 of the L-shaped member to facili-tate swinging the circuit board 112 into and out of the work-piece receiving zone between the support arms 14, 16.
In Figure 3, -there is illustrated an alternative embodiment in which a stripper accessory 116 is provided on the end of the second tool 26. The stripper accessory 116 comprises a plastic annulus 118 with a flat upper surface therein and a helical spring 120 secured to the plastic annulus 118. The stripper accessory 116 fits around the second tool 26 as shown in Figure 3 with its flat upper surface flush with the tip end of the second tool 26 and the helical spring 120 resting adjacent the top of the support mandrel 84. The purpose of the stripper accessory 116 is to square a work-piece on the second tool 26 so that the eyelet, funnelet, or the like, may be properly aligned on the work-piece prior to being contacted by the first tool 24. During the setting operation, the stripper accessory 116 is - forced along the second tool 26, and-it is to be noted that the presence of the stripper accessory 116 does not affect actual operation of the tool 24, 26. The stripper accessory 116 may be removed if insufficient space is present on the work-piece.
Operation of the machine of the present invention will now be aescribed with reference to Figure 4 of the arawings.
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In Figure 4, a work-piece such as a prlnted circuit board 112 is shown having an eyelet hole 122. A pre-inserted eyelet or funnelet 124 is loosely positi.oned in hole 122 with its pre-formed head 126 facing towards tool 24. The work-piece 112 and the eyelet 124 are moved to a position between the first and second tools 24, 26, suitably by suspending the work-piece from the clip 110 as shown in Figure 1. The work-piece 112 is located such that the eyelet 124 is positioned 10 adjacent the second tool 26, and the first tool 24 is advanced towards the pre-formed head 126 of the eyelet 124 by urging the adjustable torque screw 38 from right to left from position W as seen in Figure 2 to bring threaded portion 58 into threaded engagement with the threaded aperture 62, followed by rotating the adjustable torque screw 38 to screw the threaded portion 58 into the threaded aperture 62 and thereby advance the second tool 24 into engagement with eyelet 124. The adjustable torque screw 38 is pre-adjusted to the desired torque limit, which i.s typically 20 to 60 lbs, for example 32 to 40 lbs, usually about 35 lbs, and rotation of the hand]e 64 is continued until the torque limit is reached and the desired eyeletting pressure is achieved. As the desired eyeletting pressure is reached, upsetting and cold setting of the eyelet 124 occur so that the. eyelet is just tight enough not to rotate in hole 122, and the eyelet or funnelet is then fused to pad 128.on the printed circuit board 112 by electrically generated heat. The sizes of the first and second tools 24, 26 may be varied according to the different sizes of eyelets or funnelets utilized.
When fusing of the eyelet or funnelet 124 has been completed, the first tool 24 is withdrawn from contact with the fused eyelet by rotating the handle 64 in order to unscrew the threaded portion 58 rom the threaded aperture 62 and pull the first tool 24 and the mandrel 28 g from left to right as seen in Figure 2 as a result of the connection between the manclrel 28 and the adjustable torque screw 38 by the flexibl.e plastic tubing 72.
~otation of the handle 64 to unscrew the threaded portion 58 from the threaded aperture 62 gives rise to a relatively slow withdrawal of the first tool 24 from the work-piece 112, but this withdrawal may be increased when the threaded portion 58 becomes dis-engaged from the threaded aperture 62 so that the torque screw 38 together with the mandrel 23 oftool 24 can be manually pulled to position W. When position W
is reached, the s-top clip 70 comes into abutting engage-ment with the face 130 of the tool support post 36 in order -to avoid further withdrawal and possible dis-engagement of the screw 38 from the machine 10. If desired, a spring (not shown) may be placed between face 74 and handle 64 to assist in the movement of the adjustable torque screw 38 towards position W after dis-engagement from threaded aperture 62.
If it is desired to conduct a further eyelet fusing operation, the work-piece with the inserted eye-let is arranged with respect to the second tool 26, advantageously by suspending from a suspending arrange-ment 104 as described above, and the first tool 24 is advanced into contact with the eyelet by urging the torque screw 38 from right to left as shown in Figure 2 from position W in order to effect threaded engagement of the threaded portion 58 with the threaded aperture 62.
The handle 64 is then rotated to effect gradual advance-ment of the first -tool 24 into contact with the eyelet.
In this regard, it will be noted -that the flexible plastic tubing 72 is sized such that the end 46 of the mandrel 28 and the swivel pad 68 remain coupled when the torque screw 38 is pulled towards position W. When -~he torque screw 38 is rotated in order to advance the first tool 24 towards the second tool 26, the shaft 56 rotates, but the swivel pad 68 does not rotate in view 6c~38~2 of the swivel pad connection 132, so that rotation of the torque screw 38 does not result in the first tool 24 being rotated as it advances towards the work-piece.
It will be appreciated from the above that the machine of the present invention enjoys numerous advantages over prior eyelettin~ machines. In particular, the present machine utilizes a torque screw arrange-mentinstead of a toggle arrangernent for moving the first tool towards or away from the second tool, and this enables the machine to be used for eyelet fusing operations using eyelets of different lengths and/or circuit boards of difEerent thicknesses. In addition, the eyelet setting pressure can be set to a pre-determined value with the adjustable torque screw arrangement so that an accurate repeatable eyelet setting pressure can be applied and crushing of the board or distortion of the eyelet is substantially eliminated. Furthermore, by using the adjustable torque screw arrangement of the present invention, the accuracy of the axial alignment of the first and second tools is substantially improved over that which is generally achievable. In addition, the torque screw arrangement of the present application occupies less space thereby enabling the machine to be housed in a compact unit. A further advantage arises from the fact that the second tool is fixedly mounted in the support arm 16, so that it is not necessary to incorporate any biasing mechanism -to achieve the desired eyelet setting pressure. As discussed earlier, the eyelet setting pressure is controlled entirely by the first tool moving arrangement which incorporates the adjustable screw device, and this results ;n a more convenient and less costly machine.
The present inven-tion relates to an eyeletting machine, and more par-ticularly to a manually actuated fused eyele-tting machine capable of cold and Eused setting of eyelets and funnelets to printed circuit boards.
~CKGROUND OF T~IE IN~-ENTION
. . .
The present invention constitlltes an improvement over the fused eyeletting machines disclosed in IJnited States Patents 3,739,141; 3,940,590 and 4,584,460.
United States patent 3,739,141 discloses a fused eyeletting machine having a C-shaped frame, with the upPer arm oE
the -frame housing an upper tool, and the lower arm housing a resilient support structure for a lower tool which enables -the eyelet setting pressure to be pre-determined. The upPer tool is brought into contact with the lower -tool by means of a toggle arrangement which is ~ivoted to the upPer arm oE the frame.
United States Paten-t 3,940,590 describes an improved version of the machine disclosed in '141 patent. In the machine described in the '590 patent, the upper arm of the C-shaped frame terminates in a pair of spaced-apart tool support members, and a double stop toggle mechanism is mounted between those support members for actuating movement of the upper tool with respect to the lower tool.
United States patent 4,584,4~0 describes a further improved fused eyeletting machine which utilizes a novel and simPlified support structure for resilien-tly biasing the lower tool -to exert a pre-determined force ~,~,;.
~Z~ 32 against which the upper tool acts during the eyelet setting operation. As Wit]l the machines described in the '141 and '590 V.S. patents, the upper tool is actuated by means of a toggle arrangement.
One of the disadvantages associated with the structures described above arises from the use of a toggle arrangement for actuating movement of one of the tools towards and away from the other tool. In those toggle arrangements, the s-tro~e length is fi~ed so that difficulties in operation sometimes arise when boards of different thicknesses or eyelets of different lengths are utilized. These difficulties arise es-pecially in the circuit board repair industry where circuit boards and eyelets of various thicknesses and lengths are encountered. In light of this, care must be taken by the machine operator in each eyelet setting operation to achieve the desired eyelet setting and fusing on the board without crushing the board or dis-torting the eyelets.
A further problem which arises from the use of toggle actuating arrangements is that most toggle mechanisms are manufactured according to low tolerance specifications, so that difficulties are encountered in achieving accurate and repeatable alignment of the upper and lower tools each time the toggle arrange-ment is used. This, in turn, gives rise to possible dis-tortion of the eyelets as they are pressed into contact with the board prior to fusing, which in turn impairs the quality of the fused eyelet.
It is therefore a primary object of the present invention to provide an improved eyeletting machine capable of use with equal facility on eyelets and funnelets of different sizes and on printed circuit boards of different thicknesses.
It is another object of the present invention to ~6~ 32 provide an eyeletting machlne which utilizes a novel and simplified tool moving arrangement whereby the eyelet setting tools are brought into aligned contact with each other at a pre-determined eyelet setting pressure, which pressure can not be exceeaed despite continued operation of the tool moving arrangement after the pre-determined pressure has been reached.
SUI~l~ARY OF THE INVENTION
According to one aspect of the present invention, there is provided a machine for setting eyelets and the like, compr:ising a generally U-shaped frame having a pair of spaced-apart support arms defining a work-piece receiving zone therebetween. A first tool is movably mounted in one of the support arms, and a second tool is fixedly mounted in the other of the support arms so that the second tool is axially opposed to the first tool. A tool moving means is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre--determined eyelet setting pressure, with the tool moving means including an adjustable torque limiting means for insuring that the pre-determined eyelet setting pressure is not exceeded upon continued operation of the tool moving means.
According to another aspect of the present invention, there is provided a work-piece suspending arrangement for vertically suspending the work-piece into the work--piece receiving zone between the support arm of the U~shaped frame. This arrangement enables the work-piece to be suspended vertically next to the first and second tools, and leaves the operator free to finally position the work-piece relative to the first and second tools while actuating the tool moving means to bring the first tool into contact with the eyelet to be fused in the work-piece.
z~
BRIEF DESCRIPTION OF THE DRAWINGS
. _ .
The invention will now be described in more detail with reference to the accompanying drawings, in which:
Figure 1 is a side perspective view of the machine of the present invention;
Figure 2 is a partial cross-sectional view taken along the line 2-2 of Figure l;
Figure 3 is a partial cross-sectional view of an alternative embodiment;
Figure 4 is an enlarged cross-sectional view of a printed circuit board and an eyelet being set therein.
DETAILED DESCRIPTION OF THE INVE~TION
Referring to Figure 1, there is shown a machine, generally referenced 10, for setting eyelets and the like in printed circuit boards. The machine 10 has a U-shaped frame 12 which is suitably a cast frame. The frame has a pair of spaced-apart support arms 14, 16 connected by a base section 18. The base section 18 is preferably provided with feet members 20 which support the frame, and also enable the machine to be secured to a work table through apertures 22.
Mounted on the opposing support arms 14~ 16 of the frame is a first tool 24 and a second tool 26. The firs-t tool 24 is heid in a mandrel 28 which is movably supported in a first tool support structure 30, and the second tool 26 is fixedly mounted in a second tool support structure 32. As shown in Figure 2, the upper portion of the support arm 14 terminates in a pair of spaced-apart tool support posts 34, 36. The support post 34 houses the first tool support structure 30, and the support post 36 supports an adjustable torque ~Z6~3~%
screw 38, which is described in more detail below.
Referring to the first tool support structure 30, the mandrel 28 is slidably housed inside a cylindrical support member 40 which, together with an annular insulator ~ushing 42, is press fitted in a cy]indrical aperture 44 in the support post 34. End 46 of the mandrel 28 has a threaded portion 48 having thereon a pair of nuts 50, 52, and an electrical cable 54 is secured between the nuts. It will be seen, therefore, that the principal purpose of the annular insulator bushing 42 is to electrically insulate the cable 54 from post 34 and frame 12.
The adjustable torque screw 38, which is supported in the support post 36, includes a shaft 56 having a threaded portion 58 and an unthreaded portion 60. The threaded portion 58 is threadably received in a threaded aperture 62 in the post 36, and the threaded aperture 62 is positioned in post 36 such that the shaft 56 and the mandxel 28 are axially aligned with each other, as shown in Figure 2. The adjustable torque screw 38 has a handle 64 with an adjustable torque mechanism 66 pro- -vided internally of the handle, and rnay be of the type supplied by Jergens, Inc. of Cleveland, Ohio, U.S.A.
The handle is fixedly mounted to the threaded portion 58, so that rotation of the handle results in rotation of the shaft 56. A swivel pad 60 is mounted on the remote end of the unthreaded portion 60, and a stop clip 70 is mounted on the shaft 56 in a region of reduced diameter between the unthreaded portion 60 and the swivel pad 68. A piece of flexible plastic tubing 72 is stretch fitted over the swivel pad 68 and end 46 of the mandrel 28 between nut 52 and stop clip 70 in order to connect the mandrel 2g and the adjustable torque screw 38 together. The significance of this connection is discussed in more detail below. In order to further insure complete insulation between the frame 12 and the ~2~i~3138~
electric cable 54, an insulating ring 76 is provided between the nut 50 and the annular insulator bushing 42, and an i.nsulating pad 78 is provided on section 80 extenaing between support posts 34 and 36.
As will be seen from Figure 2, the upper portion of support arm 16 has an upstanding support member 82 with a cylindrical aperture 84 extending therethrough.
The second tool support structure 32 includes a support mandrel 84 which fixedly houses the second tool 26 at one end 86. End-94 of the support mandrel 84 is threaded and is provided with a pair of nuts 88 and 90 with an electric cable clamped therebetween.The support mandrel 84 is received in a cylindrical insulator bushing 96 wliich is press fitted in a cylindrical aperture 98 in the upstanding support member 82. A
portion of enlarged diameter 100 is provided on the support mandrel 84 which abuts against the insulator bushing 96 so that the support mandrel 84 can be firmly mounted in the cylindrical insulator bushing 96 upon tightening of the nuts 88, 90. A support plate 102 may be provided as shown in Figure 2 to provide additional support for the second tool support structure 32.
Figures 1 and 2 also show a work-piece suspending arrangement 104 which consists essentially of an L-shaped member 106 and an adjusting arm 108 which telescopingly receivable within the L-shaped member 106. As shown in Figure 1, a support means, for example a clip 110, '-is provided on the end of the adjusting arm 108 for vertically suspending a work-piece 112, typically a circuit board, into the region between the support arms 14, 16 and close to the first and second tools 24, 26. Positioning of the circult board 112 is accomplished by telescopingly moving the adjusting arm 108 inside the L-shaped member, and when the desired position has been reached, the adjusting al~ 108 can be fixed in that position by means of screw member 114. As illustrated, the suspending arrangernent 104 is mounted on the support post 34, but could also be mounted elsewhere on the machine, for example, on the upstanding support member 82. In addition, the suspending arrangement 104 may be mounted i.n the support post 34 so that it can be rotated about the axis of the vertical upstanding portion 107 of the L-shaped member to facili-tate swinging the circuit board 112 into and out of the work-piece receiving zone between the support arms 14, 16.
In Figure 3, -there is illustrated an alternative embodiment in which a stripper accessory 116 is provided on the end of the second tool 26. The stripper accessory 116 comprises a plastic annulus 118 with a flat upper surface therein and a helical spring 120 secured to the plastic annulus 118. The stripper accessory 116 fits around the second tool 26 as shown in Figure 3 with its flat upper surface flush with the tip end of the second tool 26 and the helical spring 120 resting adjacent the top of the support mandrel 84. The purpose of the stripper accessory 116 is to square a work-piece on the second tool 26 so that the eyelet, funnelet, or the like, may be properly aligned on the work-piece prior to being contacted by the first tool 24. During the setting operation, the stripper accessory 116 is - forced along the second tool 26, and-it is to be noted that the presence of the stripper accessory 116 does not affect actual operation of the tool 24, 26. The stripper accessory 116 may be removed if insufficient space is present on the work-piece.
Operation of the machine of the present invention will now be aescribed with reference to Figure 4 of the arawings.
~2fi~8fB~
In Figure 4, a work-piece such as a prlnted circuit board 112 is shown having an eyelet hole 122. A pre-inserted eyelet or funnelet 124 is loosely positi.oned in hole 122 with its pre-formed head 126 facing towards tool 24. The work-piece 112 and the eyelet 124 are moved to a position between the first and second tools 24, 26, suitably by suspending the work-piece from the clip 110 as shown in Figure 1. The work-piece 112 is located such that the eyelet 124 is positioned 10 adjacent the second tool 26, and the first tool 24 is advanced towards the pre-formed head 126 of the eyelet 124 by urging the adjustable torque screw 38 from right to left from position W as seen in Figure 2 to bring threaded portion 58 into threaded engagement with the threaded aperture 62, followed by rotating the adjustable torque screw 38 to screw the threaded portion 58 into the threaded aperture 62 and thereby advance the second tool 24 into engagement with eyelet 124. The adjustable torque screw 38 is pre-adjusted to the desired torque limit, which i.s typically 20 to 60 lbs, for example 32 to 40 lbs, usually about 35 lbs, and rotation of the hand]e 64 is continued until the torque limit is reached and the desired eyeletting pressure is achieved. As the desired eyeletting pressure is reached, upsetting and cold setting of the eyelet 124 occur so that the. eyelet is just tight enough not to rotate in hole 122, and the eyelet or funnelet is then fused to pad 128.on the printed circuit board 112 by electrically generated heat. The sizes of the first and second tools 24, 26 may be varied according to the different sizes of eyelets or funnelets utilized.
When fusing of the eyelet or funnelet 124 has been completed, the first tool 24 is withdrawn from contact with the fused eyelet by rotating the handle 64 in order to unscrew the threaded portion 58 rom the threaded aperture 62 and pull the first tool 24 and the mandrel 28 g from left to right as seen in Figure 2 as a result of the connection between the manclrel 28 and the adjustable torque screw 38 by the flexibl.e plastic tubing 72.
~otation of the handle 64 to unscrew the threaded portion 58 from the threaded aperture 62 gives rise to a relatively slow withdrawal of the first tool 24 from the work-piece 112, but this withdrawal may be increased when the threaded portion 58 becomes dis-engaged from the threaded aperture 62 so that the torque screw 38 together with the mandrel 23 oftool 24 can be manually pulled to position W. When position W
is reached, the s-top clip 70 comes into abutting engage-ment with the face 130 of the tool support post 36 in order -to avoid further withdrawal and possible dis-engagement of the screw 38 from the machine 10. If desired, a spring (not shown) may be placed between face 74 and handle 64 to assist in the movement of the adjustable torque screw 38 towards position W after dis-engagement from threaded aperture 62.
If it is desired to conduct a further eyelet fusing operation, the work-piece with the inserted eye-let is arranged with respect to the second tool 26, advantageously by suspending from a suspending arrange-ment 104 as described above, and the first tool 24 is advanced into contact with the eyelet by urging the torque screw 38 from right to left as shown in Figure 2 from position W in order to effect threaded engagement of the threaded portion 58 with the threaded aperture 62.
The handle 64 is then rotated to effect gradual advance-ment of the first -tool 24 into contact with the eyelet.
In this regard, it will be noted -that the flexible plastic tubing 72 is sized such that the end 46 of the mandrel 28 and the swivel pad 68 remain coupled when the torque screw 38 is pulled towards position W. When -~he torque screw 38 is rotated in order to advance the first tool 24 towards the second tool 26, the shaft 56 rotates, but the swivel pad 68 does not rotate in view 6c~38~2 of the swivel pad connection 132, so that rotation of the torque screw 38 does not result in the first tool 24 being rotated as it advances towards the work-piece.
It will be appreciated from the above that the machine of the present invention enjoys numerous advantages over prior eyelettin~ machines. In particular, the present machine utilizes a torque screw arrange-mentinstead of a toggle arrangernent for moving the first tool towards or away from the second tool, and this enables the machine to be used for eyelet fusing operations using eyelets of different lengths and/or circuit boards of difEerent thicknesses. In addition, the eyelet setting pressure can be set to a pre-determined value with the adjustable torque screw arrangement so that an accurate repeatable eyelet setting pressure can be applied and crushing of the board or distortion of the eyelet is substantially eliminated. Furthermore, by using the adjustable torque screw arrangement of the present invention, the accuracy of the axial alignment of the first and second tools is substantially improved over that which is generally achievable. In addition, the torque screw arrangement of the present application occupies less space thereby enabling the machine to be housed in a compact unit. A further advantage arises from the fact that the second tool is fixedly mounted in the support arm 16, so that it is not necessary to incorporate any biasing mechanism -to achieve the desired eyelet setting pressure. As discussed earlier, the eyelet setting pressure is controlled entirely by the first tool moving arrangement which incorporates the adjustable screw device, and this results ;n a more convenient and less costly machine.
Claims (11)
1. A machine for setting eyelets and the like comprising:
a generally U-shaped frame having first and second spaced-apart support arms defining a work-piece receiving zone therebetween;
a first tool movably mounted in said first support arm;
a second tool fixedly mounted in said second support arm and axially aligned with said first tool;
a tool moving means connected to said first tool for moving said first tool into contact with the said second tool at a pre-determined eyelet setting pressure, said tool moving means including an adjustable torque limiting means for insuring said pre-determined eyelet setting pressure is not exceeded upon con-tinued operation of said tool moving means.
a generally U-shaped frame having first and second spaced-apart support arms defining a work-piece receiving zone therebetween;
a first tool movably mounted in said first support arm;
a second tool fixedly mounted in said second support arm and axially aligned with said first tool;
a tool moving means connected to said first tool for moving said first tool into contact with the said second tool at a pre-determined eyelet setting pressure, said tool moving means including an adjustable torque limiting means for insuring said pre-determined eyelet setting pressure is not exceeded upon con-tinued operation of said tool moving means.
2. A machine according to claim 1, wherein said tool moving means is a rotatable adjustable torque screw having a threaded shaft with a first and a second end and an adjustable torque handle fixed to said first end.
3. A machine according to claim 2, wherein said adjust-able torque screw includes a withdrawing means for rapidly moving said first tool towards or away from said second tool.
4. A machine according to claim 3, wherein said with-drawing means is comprised of an unthreaded portion extending from a point on said shaft between said first and second ends to said second end.
5. A machine according to claim 4, wherein said adjust-able torque screw has a swivel pad mounted at said second end of said shaft.
6. A machine according to claim 2, wherein a stop is mounted near said second end of said shaft for stopping withdrawal of said first tool from said second tool.
7. A machine according to claim 6, and further including a connecting means for connecting together said swivel pad and said first tool.
8. A machine according to claim 7, wherein said connect-ing means is a piece of flexible plastic tubing in frictional engagement with said swivel pad and said first tool, said frictional engagement being sufficient to enable withdrawal of said first tool from said second tool without said swivel pad becoming disconnected from said first tool.
9. A machine according to claim 1, and further including a work-piece suspending means for vertically suspending said work-piece into said work-piece receiving zone and proximate to said first and second tools.
10. A machine according to claim 9, wherein said suspend-ing means is mounted on one of said support arms.
11. A machine according to claim 1, wherein said first support arm includes first and second spaced-apart tool support posts, a mandrel portion of said first tool being mounted in an aperture in said first tool support post, said tool moving means being mounted in said second tool support post.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67989684A | 1984-12-10 | 1984-12-10 | |
| US679,896 | 1984-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260882A true CA1260882A (en) | 1989-09-26 |
Family
ID=24728831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000496978A Expired CA1260882A (en) | 1984-12-10 | 1985-12-05 | Fused eyeletting machine |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS61199529A (en) |
| CA (1) | CA1260882A (en) |
| DE (1) | DE3543467A1 (en) |
| FR (1) | FR2574325B1 (en) |
| GB (1) | GB2169535B (en) |
| IT (1) | IT1200868B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0739019B2 (en) * | 1989-06-08 | 1995-05-01 | 吉川鐵工株式会社 | Stroke control device |
| JP2001313493A (en) * | 2000-04-27 | 2001-11-09 | Sony Corp | System for mounting electronic component |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3230751A (en) * | 1964-06-08 | 1966-01-25 | Rains Mfg Company Inc | Riveting tool for sickles |
| GB1205642A (en) * | 1967-02-25 | 1970-09-16 | Tucker Eyelet Co George | Improvements in or relating to eyeletting machines |
| US3739141A (en) * | 1971-07-26 | 1973-06-12 | W Siegel | Fused eyeletting machine |
| JPS50134785U (en) * | 1974-04-22 | 1975-11-06 | ||
| US3940590A (en) * | 1974-07-16 | 1976-02-24 | Pace, Incorporated | Fused eyeletting machine |
| JPS5817932Y2 (en) * | 1977-06-10 | 1983-04-12 | 井関農機株式会社 | Pressure cylinder safety device |
| JPS6046799B2 (en) * | 1977-08-10 | 1985-10-17 | シャープ株式会社 | microwave oven |
| GB8303633D0 (en) * | 1983-02-10 | 1983-03-16 | Armstrong Fastenings | Installing rivet nuts |
| JPS59199123A (en) * | 1983-04-27 | 1984-11-12 | Nec Corp | Caulking device |
-
1985
- 1985-12-05 CA CA000496978A patent/CA1260882A/en not_active Expired
- 1985-12-09 DE DE19853543467 patent/DE3543467A1/en not_active Withdrawn
- 1985-12-09 GB GB8530303A patent/GB2169535B/en not_active Expired
- 1985-12-10 IT IT23157/85A patent/IT1200868B/en active
- 1985-12-10 JP JP60277786A patent/JPS61199529A/en active Granted
- 1985-12-10 FR FR8518252A patent/FR2574325B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3543467A1 (en) | 1986-07-17 |
| JPH0225689B2 (en) | 1990-06-05 |
| GB8530303D0 (en) | 1986-01-22 |
| GB2169535B (en) | 1989-03-01 |
| FR2574325A1 (en) | 1986-06-13 |
| FR2574325B1 (en) | 1989-06-09 |
| IT8523157A0 (en) | 1985-12-10 |
| GB2169535A (en) | 1986-07-16 |
| JPS61199529A (en) | 1986-09-04 |
| IT1200868B (en) | 1989-01-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |