Straightening press for rod-like workpiece

Claim 2

A straightening machine for rod-like workpiece comprising a machine frame, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said stationary table, means for supporting the workpiece on said carrier, workpiece strain detection unit transversely movable on the carrier, said detection unit including a sensing element allowed to contact the workpiece for sensing the degree of workpiece strain, and power-driving means for permitting the detection unit to be moved, only at the time of detecting the degree of workpiece strain, from a retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece.

Claim 3

A straightening machine for rod-like workpiece comprising a machine frame, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said stationary base table, means for rotatably grasping both end portions of the workpiece on the carrier, workpiece strain-detection unit for detecting the degree of workpiece strain including a sensing element allowed to contact the workpiece and a support member for supporting said element, a block member slidably engaged with said support member in groove-projection relationship so as to move said detection unit transversely with respect to the travelling direction of the carrier and longitudinally slidable on the carrier so as to move said detection unit substantially in parallel with the lengthwise direction of the workpiece, and power-driving means for permitting the detection unit to be transversely moved, only at the time of detecting the degree of workpiece strain, from a retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece.

Claim 4

A straightening machine for rod-like workpiece comprising a machine frame, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said stationary base table, means for rotatably grasping both end portions of the workpiece on the carrier, workpiece strain-detection unit for detecting the degree of workpiece strain including a sensing element allowed to contact the workpiece and a support member for supporting said element, a block member slidably engaged with said support member in groove-projection relationship so as to move said detection unit transversely with respect to the travelling direction of the carrier and longitudinally slidable on the carrier so as to move said detection unit substantially in parallel with the lengthwise direction of the workpiece, and power-driving means for permitting the detection unit to be transversely moved, only at the time of detecting the degree of workpiece strain, from a retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece.

Claim 5

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, ram driving means for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, means provided on said carrier for rotatably grasping both end portions of the workpiece, supporting means for supporting the workpiece on the carrier, workpiece strain-detection means including a sensing element allowed to contact the outer periphery of the workpiece for sensing the degree of workpiece strain and movable on the carrier in a direction substantially at right angles with respect to the travelling direction of the carrier, and power-driving means for permitting said detection means to be moved, only at the time of detecting the degree of workpiece strain, from a retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece and returning said detection means from said detection position to said retirement position in advance of the operation for pressing the workpiece by the ram in accordance with the operation of said ram driving means.

Claim 6

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, ram driving means for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, means provided on said carrier for rotatably grasping both end portions of the workpiece, supporting means for supporting the workpiece on the carrier, workpiece strain-detection means including a sensing element allowed to contact the outer periphery of the workpiece for sensing the degree of workpiece strain and movable on the carrier in a direction substantially at right angles with respect to the travelling direction of the carrier, and power-driving means for permitting said detection means to be moved, only at the time of detecting the degree of workpiece strain, from a retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece and returning said detection means from said detection position to said retirement position in advance of the operation for pressing the workpiece by the ram in accordance with the operation of said ram driving means.

Claim 7

A straightening press according to claim 3, further comprising an adjustment mechanism for adjusting the downward stroke of ram from said raised position including first stop means so cooperated with said ram as to be lowered together therewith, second stop means vertically movably provided for the machine frame so as to be located below said first stop means in the falling path for the same and, when the ram is lowered from said raised position, abutting against the first stop means thereby to determine the downward stroke of ram, and power-driving means for permitting said second stop means to be moved so as to be set to any desired position.

Claim 8

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, ram driving means for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, carrier driving-power means for permitting said carrier to make a rolling movement, means for grasping both end portions of the workpiece rotatably about the axial line of the workpiece, workpiece driving-power means for permitting the workpiece to be selectively rotated about the axial line thereof, a plurality of receiving blocks for receiving the workpiece and, when said ram presses the workpiece, straightening the workpiece in cooperation with said ram, receiving block driving means for permitting respective said receiving blocks to longitudinally slide on the carrier relative thereto to vary the distance between the respective receiving blocks, a plurality of detection units for detecting the degree of workpiece strain each including a sliding member slidable on the carrier substantially at right angles with respect to the axial line of the workpiece, a lever rockably mounted onto said sliding member and rocked through an angle proportional to the amount of sensing element displacement made in accordance with the strain of the workpiece, said lever having at one arm a sensing element allowed to contact the outer periphery of the workpiece, and electrical conversion means having an operating plunger engaged with the other arm of said lever to convert the amount of sensing element displacement into an electrical amount of displacement, and detection unit driving-power means for permitting the respective sliding members of the detection units to slide, only at the time of detecting the degree of workpiece strain, from a normal retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece.

Claim 9

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, ram driving means for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, carrier driving-power means for permitting said carrier to make a rolling movement, means for grasping both end portions of the workpiece rotatably about the axial line of the workpiece, workpiece driving-power means for permitting the workpiece to be selectively rotated about the axial line thereof, a plurality of receiving blocks for receiving the workpiece and, when said ram presses the workpiece, straightening the workpiece in cooperation with said ram, receiving block driving means for permitting respective said receiving blocks to longitudinally slide on the carrier relative thereto to vary the distance between the respective receiving blocks, a plurality of detection units for detecting the degree of workpiece strain each including a sliding member slidable on the carrier substantially at right angles with respect to the axial line of the workpiece, a lever rockably mounted onto said sliding member and rocked through an angle proportional to the amount of sensing element displacement made in accordance with the strain of the workpiece, said lever having at one arm a sensing element allowed to contact the outer periphery of the workpiece, and electrical conversion means having an operating plunger engaged with the other arm of said lever to convert the amount of sensing element displacement into an electrical amount of displacement, and detection unit driving-power means for permitting the respective sliding members of the detection units to slide, only at the time of detecting the degree of workpiece strain, from a normal retirement position at which said sensing element is out of contact with the workpiece to a detection position at which said sensing element contacts the workpiece.

Claim 10

A straightening press according to claim 5, further comprising block members provided on the carrier each for supporting the sliding member of each said detection unit so as to move each detection unit substantially in parallel with the axial line of the workpiece thereby to vary the distance between the detection units.

Claim 11

A straightening press according to claim 6, wherein sliding of each sliding member is achieved by engagement of said each sliding member with the corresponding block member in groove-projection engaging relationship.

Claim 12

A straightening press according to claim 5, further comprising a spring stretched between the sliding member and said lever for urging the lever so as to rock the same in a direction in which said sensing element is brought into contact with the outer periphery of the workpiece, and stop means provided between the sliding member and the lever for limiting the rocking movement of said lever in said direction thereof against the urging action of said spring.

Claim 13

A straightening press according to claim 5, further comprising an adjustment mechanism for adjusting the downward stroke of ram from said raised position including first stop means so cooperated with said ram as to be lowered together therewith, second stop means vertically movably provided for the machine frame so as to be located below said first stop means in the falling path for the same and, when the ram is lowered from said raised position, abutting against the first stop means thereby to determine the downward stroke of ram, and power-driving means for permitting said second stop means to be moved so as to be set to any desired position.

Claim 14

A straightening press according to claim 9, wherein said second stop means includes a stop pin located in the falling path for said first stop means to abut the same and a support block for supporting said stop pin; and said power-driving means includes a feed screw shaft vertically supported by the machine frame and fitted into said support block by screw engagement to permit a vertical movement of the support block through its own rotation and a pulse motor operatively connected to said screw shaft for intermittently rotating the screw shaft.

Claim 15

A straightening press according to claim 10, further comprising a guide member fixed to said machine frame and engaged with said support block in groove-projection relationship to prevent rotation of the support block despite the rotation of said feed screw shaft, thereby to permit only a vertical movement of the support block.

Claim 16

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, a first oil hydraulic cylinder provided on said machine frame for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, a second oil hydraulic cylinder provided on said machine frame for permitting said carrier to make a rolling movement, a pair of chuck members for grasping both end portions of the workpiece rotatably about the axial line thereof, a pulse motor mounted on said carrier for permitting the workpiece to be rotated about the axial line thereof, a pair of receiving blocks for receiving the workpiece and, when said ram presses the workpiece, straightening the workpiece in cooperation with said ram, a pair of third oil hydraulic cylinders provided on said carrier and respectively connected to said pair of receiving blocks so as to permit the respective receiving blocks to longitudinally slide on said carrier thereby to vary the interval between both the receiving blocks, a plurality of base supports slidable on said carrier substantially in parallel with the axial line of the workpiece, a plurality of detection units for detecting the degree of workpiece strain each including a sliding member supported by each said base support through a groove-projection engagement and slidable substantially at right angles to the axial line of the workpiece, a lever rockably pivoted at its intermediate portion to said sliding member and rocked through an angle proportional to the amount of sensing projection displacement made in accordance with the strain of the workpiece, said lever having a sensing projection supported by one arm of said lever to be allowed to contact the outer periphery of the workpiece, and a differential transformer having an operating plunger engaged with the other arm of said lever to convert the amount of sensing projection displacement into an electrical amount of displacement, and a fourth oil hydraulic cylinder for permitting the sliding member of each detection unit to slide, only at the time of detecting the degree of workpiece strain, from a normal retirement position at which said sensing projection is out of contact with the workpiece to a detection position at which said sensing projection contacts the workpiece.

Claim 17

A straightening press for rod-like workpiece comprising a machine frame, a ram vertically movably supported by said machine frame and normally held at a raised position, a first oil hydraulic cylinder provided on said machine frame for lowering said ram from said raised position to a pressing position for pressing the workpiece, a stationary base table provided on said machine frame, a carrier longitudinally rollable on said table, a second oil hydraulic cylinder provided on said machine frame for permitting said carrier to make a rolling movement, a pair of chuck members for grasping both end portions of the workpiece rotatably about the axial line thereof, a pulse motor mounted on said carrier for permitting the workpiece to be rotated about the axial line thereof, a pair of receiving blocks for receiving the workpiece and, when said ram presses the workpiece, straightening the workpiece in cooperation with said ram, a pair of third oil hydraulic cylinders provided on said carrier and respectively connected to said pair of receiving blocks so as to permit the respective receiving blocks to longitudinally slide on said carrier thereby to vary the interval between both the receiving blocks, a plurality of base supports slidable on said carrier substantially in parallel with the axial line of the workpiece, a plurality of detection units for detecting the degree of workpiece strain each including a sliding member supported by each said base support through a groove-projection engagement and slidable substantially at right angles to the axial line of the workpiece, a lever rockably pivoted at its intermediate portion to said sliding member and rocked through an angle proportional to the amount of sensing projection displacement made in accordance with the strain of the workpiece, said lever having a sensing projection supported by one arm of said lever to be allowed to contact the outer periphery of the workpiece, and a differential transformer having an operating plunger engaged with the other arm of said lever to convert the amount of sensing projection displacement into an electrical amount of displacement, and a fourth oil hydraulic cylinder for permitting the sliding member of each detection unit to slide, only at the time of detecting the degree of workpiece strain, from a normal retirement position at which said sensing projection is out of contact with the workpiece to a detection position at which said sensing projection contacts the workpiece.