Abstract A rivet detecting apparatus having upper and lower annular clamps engaging the workpieces to be riveted and upper and lower anvils positioned in the upper and lower clamps. The upper anvil abuts the headed end of a rivet and is held stationary while the lower anvil is moved against the shank end of the rivet to form a head thereon. The lower anvil is spaced upwardly from a drive ram and is urged upwardly against the work by a spring. When a rivet is inserted in a hole formed in the workpieces, the lower shank end of the rivet engages the lower anvil and moves it downwardly against the spring bias. Downward movement of the lower anvil engages a movable plunger which actuates a limit switch to move the drive ram against the lower anvil and force it upwardly against the shank end of the rivet to form a head thereon. In the absence of a rivet in the rivet hole, the lower anvil remains in its uppermost position, the limit switch is not actuated, and operation of the riveting machine is terminated.
Apparatus for detecting the presence of a rivet in a rivet hole extending through work to be riveted comprising a pair of clamping members relatively movable toward each other to clamp the work therebetween, a rivet head forming anvil, a ram operable to engage and move said forming anvil against a rivet end to form a head thereon, resilient means for biasing said anvil away from said ram and into a work engaging position; said anvil being movable away from said work by one end of a rivet inserted through said hole of said work, a bucking member abutting the other end of said rivet, and means responsive to movement of said anvil in a direction away from said work by said rivet for driving said ram against said anvil to move said anvil in an opposite direction against said one end of said rivet to form a head thereon.
Claim 2
Dependent Claim
150 words
Apparatus for detecting the presence of a rivet in a rivet hole extending through work to be riveted comprising a pair of clamping members relatively movable toward each other to clamp the work therebetween, a rivet head forming anvil, a ram operable to engage and move said forming anvil against a rivet end to form a head thereon, resilient means for biasing said anvil away from said ram and into a work engaging position; said anvil being movable away from said work by one end of a rivet inserted through said hole of said work, a bucking member abutting the other end of said rivet, and means responsive to movement of said anvil in a direction away from said work by said rivet for driving said ram against said anvil to move said anvil in an opposite direction against said one end of said rivet to form a head thereon.
Claim 3
Dependent Claim
43 words
Apparatus according to claim 1 wherein said responsive means includes a limit switch and an operator therefor engageable by one end of said anvil upon movement thereof caused by said rivet engagement for actuating said limit switch and initiating operation of said ram.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 1 wherein said clamping members are annular and coaxial with said bucking member and said rivet head forming anvil.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 1 wherein said anvil is provided with an annular enlargement slidable within an enlarged portion of one of said clamping members and defining a chamber therewith.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 4 together with means for admitting air pressure into said chamber for moving said anvil against the bias of said resilient means into an initial position away from said work.