CA1055121A - Welding gun adapted to weld movable contacts on wire spring relays - Google Patents
Welding gun adapted to weld movable contacts on wire spring relaysInfo
- Publication number
- CA1055121A CA1055121A CA277,077A CA277077A CA1055121A CA 1055121 A CA1055121 A CA 1055121A CA 277077 A CA277077 A CA 277077A CA 1055121 A CA1055121 A CA 1055121A
- Authority
- CA
- Canada
- Prior art keywords
- jaw
- movement
- wire
- jaws
- mounting member
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
- H01H11/043—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion by resistance welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/28—Portable welding equipment
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wire Bonding (AREA)
- Resistance Welding (AREA)
Abstract
A B S T R A C T
A welding gun for replacing the movable contacts of wire spring relays is provided with a pair of jaws re-latively movable toward each other to clamp the contact material to the relay arm for welding them together. A manual control member is movable to cause the relative movement over a resilient connection which provides the clamping pressure.
the manual control member moves past the point in its travel where clamping is achieved stressing the resilient connection to actuate a switch to initiate the welding cycle. The clamping pressure is thus controlled at the time that welding commences.
A welding gun for replacing the movable contacts of wire spring relays is provided with a pair of jaws re-latively movable toward each other to clamp the contact material to the relay arm for welding them together. A manual control member is movable to cause the relative movement over a resilient connection which provides the clamping pressure.
the manual control member moves past the point in its travel where clamping is achieved stressing the resilient connection to actuate a switch to initiate the welding cycle. The clamping pressure is thus controlled at the time that welding commences.
Description
- ~0551Z~
This invention relates to a weldin~ gun for weldin~ the movable contact on a wire spring relay.
The contacts on a wire spring relay burn out under use and it is desireable to replace such contacts in situ without the necessity o~ withdrawing the relay from its location for usev The object o~ the invention is to provide a welding gun designed to clamp the new contact material to the wire o~ the relay arm for welding pressure but to provide that the pressure is a consistent predetermined amount when the welding cycle is initiated.
In accord with the invention a pair o~ welding jaws are designed to move relative to one ano.her to cla~p the replacement relay contact to the wire spring. A
manually operable control member is provided to cause this relative movement, ~he connection between the manually operable control member and the jaws to cause such relativ~ ;
movemen~ is such that, movement of the manually operable control member over an extent of movement moves one end or a spring. The~pring is mounted to connect the manually operable control ~ember to the jaws`so that movement of such one end of the spring causes through the spring the jaws ;-to move the clamping position. Continued movement of the clamping member in the sa~e direction aftèr the jaws have reached closed position causes the spring to be stressed to increase the clamping pr~ssure on the jaws. At a pre-determined extent of such continued movement the manual control member is caused to operate a switch to apply to the jaws, the welding current. Since the clamping pressure may be predetermined and is always the same at the point of application of the welding current, consistent results may be : , , ," ." , , . ,: :
.. . .
1055~
obtained with the welding gun in accord with the invention.
In drawings which illustrate a preferred embodiment of the invention :
In the drawings Figures 1 & 2 shows a gun includin~
a casing 10 designed to have a straight handle portion 12 a jaw mounting arm or "barrel" 14 extending forwardly fro~
the upper end of handle portion 12 and a reel mount 16 pro-jecting rearwardly from the upper end of handle portion 12.
Figure 3 shows a cross section along the line 3 - 3 of g ~he reel mount 16 comprises rear~rdly directed recesses on each side of the outer walls o the casing and a pair of plates 20 designed to be received in the respective xecesses 18. A bolt 22 extends through the plates 20 and a nut 24 mounted on bolt 22 allows it to be tightened to cl~p the plates 20 in the recesses. Rotatably mounted on the bolt 22 between the plates 20 is a reel 26 providing a groove on which the strip 25 of contact forming material is wound. The contact forming material is shown in Figure ~
and comprises a base strip of palladium-silver alloy with a gold overlay. The base strip on the side opposite the overlay is formed with a bead which is the portion actually welded to the relay wire. The gold overlay forms the actual relay contact. The strip of contact forming material is led off the top and forwardly through a tension control which acts merely as a "drag" or tension control to the movement of ;
the strip 25 from the reel to the forward portion of the gu~.
This tension control may be of any desired form but the particular tension control used comprises a tubular member 26 with central bore 30 having at one end, threading 27 at the outer wall and at the other end a cylindrical enlargement 28 is provided with a parallel sided radial slot 29 leading to the central bore 30 of the tube and to the forward end thereof.
," , .
This invention relates to a weldin~ gun for weldin~ the movable contact on a wire spring relay.
The contacts on a wire spring relay burn out under use and it is desireable to replace such contacts in situ without the necessity o~ withdrawing the relay from its location for usev The object o~ the invention is to provide a welding gun designed to clamp the new contact material to the wire o~ the relay arm for welding pressure but to provide that the pressure is a consistent predetermined amount when the welding cycle is initiated.
In accord with the invention a pair o~ welding jaws are designed to move relative to one ano.her to cla~p the replacement relay contact to the wire spring. A
manually operable control member is provided to cause this relative movement, ~he connection between the manually operable control member and the jaws to cause such relativ~ ;
movemen~ is such that, movement of the manually operable control member over an extent of movement moves one end or a spring. The~pring is mounted to connect the manually operable control ~ember to the jaws`so that movement of such one end of the spring causes through the spring the jaws ;-to move the clamping position. Continued movement of the clamping member in the sa~e direction aftèr the jaws have reached closed position causes the spring to be stressed to increase the clamping pr~ssure on the jaws. At a pre-determined extent of such continued movement the manual control member is caused to operate a switch to apply to the jaws, the welding current. Since the clamping pressure may be predetermined and is always the same at the point of application of the welding current, consistent results may be : , , ," ." , , . ,: :
.. . .
1055~
obtained with the welding gun in accord with the invention.
In drawings which illustrate a preferred embodiment of the invention :
In the drawings Figures 1 & 2 shows a gun includin~
a casing 10 designed to have a straight handle portion 12 a jaw mounting arm or "barrel" 14 extending forwardly fro~
the upper end of handle portion 12 and a reel mount 16 pro-jecting rearwardly from the upper end of handle portion 12.
Figure 3 shows a cross section along the line 3 - 3 of g ~he reel mount 16 comprises rear~rdly directed recesses on each side of the outer walls o the casing and a pair of plates 20 designed to be received in the respective xecesses 18. A bolt 22 extends through the plates 20 and a nut 24 mounted on bolt 22 allows it to be tightened to cl~p the plates 20 in the recesses. Rotatably mounted on the bolt 22 between the plates 20 is a reel 26 providing a groove on which the strip 25 of contact forming material is wound. The contact forming material is shown in Figure ~
and comprises a base strip of palladium-silver alloy with a gold overlay. The base strip on the side opposite the overlay is formed with a bead which is the portion actually welded to the relay wire. The gold overlay forms the actual relay contact. The strip of contact forming material is led off the top and forwardly through a tension control which acts merely as a "drag" or tension control to the movement of ;
the strip 25 from the reel to the forward portion of the gu~.
This tension control may be of any desired form but the particular tension control used comprises a tubular member 26 with central bore 30 having at one end, threading 27 at the outer wall and at the other end a cylindrical enlargement 28 is provided with a parallel sided radial slot 29 leading to the central bore 30 of the tube and to the forward end thereof.
," , .
- 2 -, ~(~S~lZl ~- A parallel sided lever 32, dimensioned to be loosely slidable in the slot 29 is pivotally mounted in t~e slot 29 by pin 34 near the rearward cnd of the lever 3~ to pivo.
toward and away from the opposed sur~ace deriring groove 30.
A r~bber annular 0 - ring 36 seats in a peripheral groove formed in the outer surlace of the enlarge~ent 28 and le~er 32. The rubber 0 - ring acts to bias the inner forward edge of the lever 32 against the opposed surface definin~
bore 30 and to exert a predetermined maximum drag or tension on ~he strip 25 passing therethrough. The drag or tension is controlled by providing, on the rearward end of the lever 32 an inwardly rearwardly ch~lerred sur~ace 38 ~hich extends réàrwardly of block 28~ A sleeve 40 is designed to screw onto threading 27 and has its wall extending forwardly to contact the chamferred surface 38. Thus, with the lever biased inwardly by the 0 - ring against the strip 25, the .
pressure may be reduced by screwing the sleeve 40 to advance it forwardly so that the sleeve wall contacts the cham~erred surface 38 of the lever 32 to depress the shank to the ~`.
extent desired. Conv~rsely rearward movement o~ the sleeve progressi~ely releases the lever 32 to increase the drag or tension on the strip. The rearward end of the sleeve 40 is suitably notched, to permit screwdriver adjustment. The sleeve 40 and tube assembly is designed to be slid into a corresponding bore in t:he casing and a setscrew 42 operable from the outside if the casing may be tightened to maintain the drag or tensioning device in the correct location and orientation. As previously stated, any equivalent (pre-ferably adjustable) drag or tensioning device may be used.
The casing is provided with a bore extending out of ,.. . . .
, . . . . . . . . .
. 10551~1 -4-. the forward end of the casing to allow passage of the st- i~
25 from the forwzrd end of bore 30. A pair of welding ja~s are ~ou~ted on the forward end of the casing. These are referred to as fixed and movable jaws 44 and 46. The jaws are constructed of electrically conducting, non welda~le material, such as copper. The fixed jaw 44 is mounted to extend outwardly from the casing to converge toward the movable ~aw 46 and is provided at its outer end with a downwardly directed face 48 shaped to contact the "elbow" at the end o a movable contact arm o the relay of the type known as w;re spring relay. The outer end of the iaW 44 is therefore provided with a groove 50 extending downwardly toward the other jaw to receive the extent 52 of the relay wire contact arm, while the contact face 54 is grooved to seat a porti~n of the tip 56 of the wire contact arm. It will be noted that the groove in the contact face 54 seats the tip 56 less than completely, since a portion of the thickness o~ tip 56 must project below the contact surface to allow it to ~e pressed against the strip 25. The fixed jaw 44 is mounted to be rixed against translating movement that the movable jaw 46 moves toward and away from ~t in the use of the tool, However the upper jaw may be mounted for rotational adjustment about an axis forward and rearward of the gun to allow its orienta- -tion to be fixed. As shown, this is achieved by mounting the ~aw 44 on a long shank 45, extending through the casing to a threaded end projecting rearwardly of the casing on which end is provided a ~nirled nut 58 which may be tightened to cla~p the fixed jaw 44 in the desired orientation.
~he movable jaw 46 is provided at its outer end with a contact ace 60 located to approach the corresponding ,; . , '' ' ' '' ' , 10551Zl _5_ ' _ contact face 5~ of the fived jaw member 44 and is provided with a shallow groove 62 e~tending in the tape e~tension direction, to partially receive tle strip 25 with the gold contact sur~ace in the ro~ of th2 groove and the base out-wardly thereof. As with the fi~ed jaw face the groove 62 for the tape in the movable jaw face 60 is shallow to cause a portion of the thic~ness of the strip member .o proj2ct upwardly therefrom to allow clamping pressure to be exerted thereon to clamp the strip 25 against the wire contact arm tip 56 seated in jaw 46.
Between the con~act face 60 and the tension device the movable jaw 46 is provided with alignment means for the strip 25 comprising a circular bore 66 in a projection from the movable jaw member and a deep groove 68 in anotner pro-jection. These are to maintain alignment o the strip between the jaws and the tension member.
.
- The movable jaw 46 is mounted on the end of a jaw ~ -) - mounting member comprising an arm 70 pivotted at 72 near tne rear o' the casing, the arm 70 being designed to be relatively long so that comparatively little change of orientation occurs in the moving jaw faco 54 over its (small) extend of movement.
The jaw 46 and arm 70 are provided with guides in the casing to guide their movement t~ard andaway from the fixed ~aw 44 The arm 70 mounting the movable jaw 46 is provided with a cam surface 72 exten~ing suhstantially parallel to the arm 70 and the direction of strip m~vement. This cam sur~ace is acted upon by a shoe 73 preferably of nylon, movable upward and down~ard (while sliding longitudinally along the surface 72) under the control of the trigger arm which will now be des-cribed. The movable jaw is prefexably biased downwardly by :
~ SlZ~ ~,a spring 77.
The handle portion of the casing is split to provide a for~rdly directed opening between the side walls. A manually operable member comprising a trigger member is provided movable in such ooening and between such ~alls and com~rising an arm 7a pivotted to the.casing at 76 near the lower end of both and arm 74 extends upwardly with a forward sur.ace located forwardl~ of the forward edge of the casing handle ~alls to be moved rear-wardly by the clasping of a hand a~out the handle portion and trigger.
The upward end of the trigger arm 74 projects forwardl~
and on the upper surface is attached, ~y any suitable method, a leaf spring 76 projecting forwardly, u~owardly turned on its forward end and coupled on its upwardly turned forward end to the shoe 73 which slides along the cam surface 72 of the movable jaw arm. The shoe, on its surface which contacts the end of the leaf spring 7~, is provided with a groove, as shown, on each side of the leaf spring to contact the end of the spring to cause the shoe 73 to translate with the spring 76. A micro switch 75 ls mounted inside the casing to be contacted and operated by the trigger arm during the last 2-3 of its movement toward a position perpendicular to arm 70. The arm 70 and jaw 46 are spring biassed downwardly in any desired manner such as by leaf spring 77. ........................................ . -The arm 74, spring 76, shoe 73 and micro switch are so arranged that initial rearward movement of arm 74 from its rest position (i~e.greatest projection from the casing) m~ves arm 74 upward to cause the movable jaw to clamp the strip material against the wire arm. At this point the upper surface o the strip on the lower jaw i- in position "B", the rear surface oi l os s ~
arm 7~ is at posi-tion A and the rear-~ard end ~f the shoe 73 is at positio~ "C". However wnen the arm , has m3ved su~f~
ently to achi~ve this clamping, it has not yet con'acted the micro switch, it is preferably 2 - 3 fro~ a position of per-pendicularity to arm 70 mounting the movabla jaw. The ar~ 74 moves past the clamping position a snort distance .o actuate the micro switch, maintaining a nearly constant but sligh.ly increasing clamping pressure over this s~o-~ dista~ce ~he micro switch is connected to actuate welding current control (not shown) usually having means at a controlled s~art and over a controlled period. ~_lding current is during such period applied across the jaws which are connected to the control and insulated from each other (and to avoid harm to the operator) --by means not shown but well known to those skilled in the art Tn operation, before use of the gun the ~icro switch is, of course, off with the trigger arm 74 for~Jard, the elbow of the wire contact arm is nestled in the fixed jaw ~4 as previously explained, with the contact arm tip 56 partially seated in the groove in face 54. The strip 25 is extended so that a portion ~ -thereof is partly seated in the groove 62 of the mo~able jaw 46, again as previously described. ~Usually the tape is pulled too far through the jaws say to position '~" and retra~ted by the reel until its end corresponds to the outer face ~f the jaws.
The trigger arm 74 is t~en pulled moving the spring 76 accompanied by the shoe ;3 rearwardly and upwardly until the arm 70 has moved upwardly sufficiently tha~ clamping of s.rip 25 to wire contact arm tip 56 is achieved. The movement o~ tnese mRmbers i5 continued, to provide operation of the micro switch to initiate the welding operation~ It will be noted that the leaf spring 76 provides the same clamping pressure on eacn .' , ', ' .
1~ S 3 ~ 8 welding operation and that this clamping pressllre varies little ~etween initial clamping and the time of opera.ion of the micro switch. The position of the micro switch is - preferably adjustable.
The initiation and duration of the weld consequent upon the operation of the microswitch is controlled by timing means not shown ànd well known to those skilled in the art.
When the weld is completed the trigger arm 74 is released and pre~erably is designed to move fo~ard under the pressure o the soring 79. Movable jaw 46 is opened, by spring 77 or alternative spring biassing means. Consequently the micro switch is released and (from its design) allowed to reset and the movable jaw 46 opens. The gun may then be moved a slight distance away from the now welded relay wire and contact causing a short length of strip 25 to unwind from the reel to allow the insertion between the strip 25 and the contact o~ a cutting tool to cut the unused strip from that welded as the relay contact. The relay contact is ready for use. The strip may be retracted until its outer end corresponds to the outer end of the relay jaws ready to repeat the operation. `
It will be seen that the spring 7~ provides the flexible or resilient connection discussed in the introduction between the movable jaw 46 and the manually operable member here embodied by trigyer arm 74. The spring 76 moves the movable jaw 64 under the control of trigger arm 74 until clamping is achieved and resiliently maintains (slightly increasing) the clamping pressur~
until the ~urther movement (with the jaws then stationary) of the arm 74 operates the micro switch. Thus the flexible or spring conneetion between the manual operation and the movable jaw allows movement of the movable jaw, applies the clamping .
" , ,, lO5S~l pressure and maintains this during the operation of the micro switch ensuring that the clamping pressure is the same for each operation of the gun.
.
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toward and away from the opposed sur~ace deriring groove 30.
A r~bber annular 0 - ring 36 seats in a peripheral groove formed in the outer surlace of the enlarge~ent 28 and le~er 32. The rubber 0 - ring acts to bias the inner forward edge of the lever 32 against the opposed surface definin~
bore 30 and to exert a predetermined maximum drag or tension on ~he strip 25 passing therethrough. The drag or tension is controlled by providing, on the rearward end of the lever 32 an inwardly rearwardly ch~lerred sur~ace 38 ~hich extends réàrwardly of block 28~ A sleeve 40 is designed to screw onto threading 27 and has its wall extending forwardly to contact the chamferred surface 38. Thus, with the lever biased inwardly by the 0 - ring against the strip 25, the .
pressure may be reduced by screwing the sleeve 40 to advance it forwardly so that the sleeve wall contacts the cham~erred surface 38 of the lever 32 to depress the shank to the ~`.
extent desired. Conv~rsely rearward movement o~ the sleeve progressi~ely releases the lever 32 to increase the drag or tension on the strip. The rearward end of the sleeve 40 is suitably notched, to permit screwdriver adjustment. The sleeve 40 and tube assembly is designed to be slid into a corresponding bore in t:he casing and a setscrew 42 operable from the outside if the casing may be tightened to maintain the drag or tensioning device in the correct location and orientation. As previously stated, any equivalent (pre-ferably adjustable) drag or tensioning device may be used.
The casing is provided with a bore extending out of ,.. . . .
, . . . . . . . . .
. 10551~1 -4-. the forward end of the casing to allow passage of the st- i~
25 from the forwzrd end of bore 30. A pair of welding ja~s are ~ou~ted on the forward end of the casing. These are referred to as fixed and movable jaws 44 and 46. The jaws are constructed of electrically conducting, non welda~le material, such as copper. The fixed jaw 44 is mounted to extend outwardly from the casing to converge toward the movable ~aw 46 and is provided at its outer end with a downwardly directed face 48 shaped to contact the "elbow" at the end o a movable contact arm o the relay of the type known as w;re spring relay. The outer end of the iaW 44 is therefore provided with a groove 50 extending downwardly toward the other jaw to receive the extent 52 of the relay wire contact arm, while the contact face 54 is grooved to seat a porti~n of the tip 56 of the wire contact arm. It will be noted that the groove in the contact face 54 seats the tip 56 less than completely, since a portion of the thickness o~ tip 56 must project below the contact surface to allow it to ~e pressed against the strip 25. The fixed jaw 44 is mounted to be rixed against translating movement that the movable jaw 46 moves toward and away from ~t in the use of the tool, However the upper jaw may be mounted for rotational adjustment about an axis forward and rearward of the gun to allow its orienta- -tion to be fixed. As shown, this is achieved by mounting the ~aw 44 on a long shank 45, extending through the casing to a threaded end projecting rearwardly of the casing on which end is provided a ~nirled nut 58 which may be tightened to cla~p the fixed jaw 44 in the desired orientation.
~he movable jaw 46 is provided at its outer end with a contact ace 60 located to approach the corresponding ,; . , '' ' ' '' ' , 10551Zl _5_ ' _ contact face 5~ of the fived jaw member 44 and is provided with a shallow groove 62 e~tending in the tape e~tension direction, to partially receive tle strip 25 with the gold contact sur~ace in the ro~ of th2 groove and the base out-wardly thereof. As with the fi~ed jaw face the groove 62 for the tape in the movable jaw face 60 is shallow to cause a portion of the thic~ness of the strip member .o proj2ct upwardly therefrom to allow clamping pressure to be exerted thereon to clamp the strip 25 against the wire contact arm tip 56 seated in jaw 46.
Between the con~act face 60 and the tension device the movable jaw 46 is provided with alignment means for the strip 25 comprising a circular bore 66 in a projection from the movable jaw member and a deep groove 68 in anotner pro-jection. These are to maintain alignment o the strip between the jaws and the tension member.
.
- The movable jaw 46 is mounted on the end of a jaw ~ -) - mounting member comprising an arm 70 pivotted at 72 near tne rear o' the casing, the arm 70 being designed to be relatively long so that comparatively little change of orientation occurs in the moving jaw faco 54 over its (small) extend of movement.
The jaw 46 and arm 70 are provided with guides in the casing to guide their movement t~ard andaway from the fixed ~aw 44 The arm 70 mounting the movable jaw 46 is provided with a cam surface 72 exten~ing suhstantially parallel to the arm 70 and the direction of strip m~vement. This cam sur~ace is acted upon by a shoe 73 preferably of nylon, movable upward and down~ard (while sliding longitudinally along the surface 72) under the control of the trigger arm which will now be des-cribed. The movable jaw is prefexably biased downwardly by :
~ SlZ~ ~,a spring 77.
The handle portion of the casing is split to provide a for~rdly directed opening between the side walls. A manually operable member comprising a trigger member is provided movable in such ooening and between such ~alls and com~rising an arm 7a pivotted to the.casing at 76 near the lower end of both and arm 74 extends upwardly with a forward sur.ace located forwardl~ of the forward edge of the casing handle ~alls to be moved rear-wardly by the clasping of a hand a~out the handle portion and trigger.
The upward end of the trigger arm 74 projects forwardl~
and on the upper surface is attached, ~y any suitable method, a leaf spring 76 projecting forwardly, u~owardly turned on its forward end and coupled on its upwardly turned forward end to the shoe 73 which slides along the cam surface 72 of the movable jaw arm. The shoe, on its surface which contacts the end of the leaf spring 7~, is provided with a groove, as shown, on each side of the leaf spring to contact the end of the spring to cause the shoe 73 to translate with the spring 76. A micro switch 75 ls mounted inside the casing to be contacted and operated by the trigger arm during the last 2-3 of its movement toward a position perpendicular to arm 70. The arm 70 and jaw 46 are spring biassed downwardly in any desired manner such as by leaf spring 77. ........................................ . -The arm 74, spring 76, shoe 73 and micro switch are so arranged that initial rearward movement of arm 74 from its rest position (i~e.greatest projection from the casing) m~ves arm 74 upward to cause the movable jaw to clamp the strip material against the wire arm. At this point the upper surface o the strip on the lower jaw i- in position "B", the rear surface oi l os s ~
arm 7~ is at posi-tion A and the rear-~ard end ~f the shoe 73 is at positio~ "C". However wnen the arm , has m3ved su~f~
ently to achi~ve this clamping, it has not yet con'acted the micro switch, it is preferably 2 - 3 fro~ a position of per-pendicularity to arm 70 mounting the movabla jaw. The ar~ 74 moves past the clamping position a snort distance .o actuate the micro switch, maintaining a nearly constant but sligh.ly increasing clamping pressure over this s~o-~ dista~ce ~he micro switch is connected to actuate welding current control (not shown) usually having means at a controlled s~art and over a controlled period. ~_lding current is during such period applied across the jaws which are connected to the control and insulated from each other (and to avoid harm to the operator) --by means not shown but well known to those skilled in the art Tn operation, before use of the gun the ~icro switch is, of course, off with the trigger arm 74 for~Jard, the elbow of the wire contact arm is nestled in the fixed jaw ~4 as previously explained, with the contact arm tip 56 partially seated in the groove in face 54. The strip 25 is extended so that a portion ~ -thereof is partly seated in the groove 62 of the mo~able jaw 46, again as previously described. ~Usually the tape is pulled too far through the jaws say to position '~" and retra~ted by the reel until its end corresponds to the outer face ~f the jaws.
The trigger arm 74 is t~en pulled moving the spring 76 accompanied by the shoe ;3 rearwardly and upwardly until the arm 70 has moved upwardly sufficiently tha~ clamping of s.rip 25 to wire contact arm tip 56 is achieved. The movement o~ tnese mRmbers i5 continued, to provide operation of the micro switch to initiate the welding operation~ It will be noted that the leaf spring 76 provides the same clamping pressure on eacn .' , ', ' .
1~ S 3 ~ 8 welding operation and that this clamping pressllre varies little ~etween initial clamping and the time of opera.ion of the micro switch. The position of the micro switch is - preferably adjustable.
The initiation and duration of the weld consequent upon the operation of the microswitch is controlled by timing means not shown ànd well known to those skilled in the art.
When the weld is completed the trigger arm 74 is released and pre~erably is designed to move fo~ard under the pressure o the soring 79. Movable jaw 46 is opened, by spring 77 or alternative spring biassing means. Consequently the micro switch is released and (from its design) allowed to reset and the movable jaw 46 opens. The gun may then be moved a slight distance away from the now welded relay wire and contact causing a short length of strip 25 to unwind from the reel to allow the insertion between the strip 25 and the contact o~ a cutting tool to cut the unused strip from that welded as the relay contact. The relay contact is ready for use. The strip may be retracted until its outer end corresponds to the outer end of the relay jaws ready to repeat the operation. `
It will be seen that the spring 7~ provides the flexible or resilient connection discussed in the introduction between the movable jaw 46 and the manually operable member here embodied by trigyer arm 74. The spring 76 moves the movable jaw 64 under the control of trigger arm 74 until clamping is achieved and resiliently maintains (slightly increasing) the clamping pressur~
until the ~urther movement (with the jaws then stationary) of the arm 74 operates the micro switch. Thus the flexible or spring conneetion between the manual operation and the movable jaw allows movement of the movable jaw, applies the clamping .
" , ,, lO5S~l pressure and maintains this during the operation of the micro switch ensuring that the clamping pressure is the same for each operation of the gun.
.
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, , ., . , . ,~.
Claims (2)
1. In a welding gun, a pair of jaws of electrically conducting, non-weldable material defining mutually facing surfaces, one of said surfaces being designed to seat a wire of a relay leaving a surface of the wire displaced therefrom toward the surface of the other jaw, the other of said jaw surfaces being designed to seat a strip of material embodying the contact to be welded to said wire in a location to be clamped against said wire on the relative approach of said jaws, one of said jaws being mounted on a jaw mounting member, said jaw mounting member being mounted on said casing to move in a direction to cause the jaw to move between a position to clamp said wire against said contact material between the two jaws, and a position more widely spaced from the other jaw, means releasably biassing said jaw mounting member toward the more spaced position, a control member manually movable over a range of movement, said control member and saw jaw mounting member being arranged and directed so that on movement over said range in one direction said control member causes said jaw mounting member to move the jaw mounted thereon into clamping relationship with the other jaw, a spring connection between said control member and said jaw mounting member whereby on movement of said control member in said one direction said controlmember causes said jaw mounting member movement over said spring until said clamping is achieved and thereafter movement of said control member a further distance in said one direction causes stress of said spring resulting in pressure of the jaw, which is mounted on the jaw mounting member, on the other jaw, and a switch for electrically energizing said welding jaws located and designed to be actuated on movement of said control member over said further range of movement.
2. In a welding gun, a casing, a pair of jaws of electrically conducting, non-weldable material defining mutually facing surfaces, one of said surfaces being designed to seat a wire forming the contact arm of a relay leaving a portion of the wire displaced therefrom toward the surface of the other jaw, the other of said jaw surfaces being designed to seat strip material embodying the contact to be welded to said wire in a location to be clamped against said wire on the relative approach of said jaws, one of said jaws being attached to a jaw mounting member, said jaw mounting member being mounted on said casing to move in a direction to cause such one jaw to move between a position to clamp said wire against said contact and a more spaced position, a control member mounted on said casing to move through a range of movement, a spring connection between said control member and said jaw mounting member arranged so that movement of said control member a predetermined amount in one direction over said range of movement moves said jaw mounting member to move said one jaw into clamping position by means of said clamping connection, and further movement of said control member in said one direction stresses said spring connection while main-taining said jaw in clamping position, said stressed spring causing clamping pressure of said one jaw toward the other jaw, and a electric contact located and designed to be closed by movement of said control means through said further movement.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA277,077A CA1055121A (en) | 1977-04-25 | 1977-04-25 | Welding gun adapted to weld movable contacts on wire spring relays |
| GB164878A GB1571469A (en) | 1977-04-25 | 1978-01-16 | Welding gun adapted to weld movable contacts of wire spring relays |
| JP1306178A JPS53132445A (en) | 1977-04-25 | 1978-02-09 | Welding gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA277,077A CA1055121A (en) | 1977-04-25 | 1977-04-25 | Welding gun adapted to weld movable contacts on wire spring relays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1055121A true CA1055121A (en) | 1979-05-22 |
Family
ID=4108513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA277,077A Expired CA1055121A (en) | 1977-04-25 | 1977-04-25 | Welding gun adapted to weld movable contacts on wire spring relays |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS53132445A (en) |
| CA (1) | CA1055121A (en) |
| GB (1) | GB1571469A (en) |
-
1977
- 1977-04-25 CA CA277,077A patent/CA1055121A/en not_active Expired
-
1978
- 1978-01-16 GB GB164878A patent/GB1571469A/en not_active Expired
- 1978-02-09 JP JP1306178A patent/JPS53132445A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1571469A (en) | 1980-07-16 |
| JPS53132445A (en) | 1978-11-18 |
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