摘要:
A slide-type pressing machine has a stroke length adjustment mechanism in which: changing of the stroke length does not effect the bottom dead center position of the press, adjustment is simplified, and the press is suitable for high speed pressing operations. The slide-type pressing machine has an eccentric section of a crank shaft which causes a slider to move up and down. An arm extends past a fixed pivot of an upper toggle link. One end of the arm is connected to the slider by a connecting link. A drive link and a drive connecting link are connected by a connecting pivot. A worm wheel is disposed on a frame, and is concentric with the connecting pivot when the slide is at bottom dead center. The worm wheel is arranged so that its rotation angle can be adjusted. A second arm is disposed in a radial direction from the axis of the worm wheel. A second pin is located at an end of the second arm. The second pin is connected to the connecting pivot via a third link. The motion of the connecting pivot is restricted to either an arcuate or linear path. The position of the second pin is changed to adjust the stroke length of the slide and the bottom dead center is kept fixed.
摘要:
A slide drive device for a press changes a slide stroke without a changing either a top or bottom dead center position of a slide. The slide drive device allows stroke adjustment without a loss of left-right balance in the slide drive device. An adjusting mechanism is driven by an eccentric part and a crank shaft. The adjusting mechanism is adaptable to fix either the top or bottom dead center position. A linear guide mechanism, is driven by the adjusting mechanism, and transfers adjustments in slope angle into changes in stroke relative to either the top or bottom dead center position without requiring a change in the dead center position. Alternate embodiments allow positioning and adjustment for convenience and economy.
摘要:
A double acting hydraulic cylinder is a die cushion for a press, with an upper and a lower chamber in communication with each other and with a differential pressure between the two chambers automatically controlled by a valve mechanism. With the differential pressure controlled according to one of several desired curves, the die cushion capability during press operation can be changed and adjusted to a valve suitable for the product to be processed and so a wide variety of products can be produced in high quality and high efficiency.
摘要:
A feed bar driving apparatus for a transfer press. A pair of carriers is located at each of the ends of two parallel feed bars. The carriers each have vertically movable feed bar receptacles thereon for holding the feed bars for permitting them to slide freely in the direction of their length while restricting their movements in the lateral direction and move toward and away from each other in clamping and unclamping movements. A rack mechanism between the carriers has a rack attached to each carrier, a pinion engaging each rack and located at positions between the corresponding carriers and the center of the space between the carriers, and an even number of idler gears connected between the pinions for driving the pinions in opposite directions of rotation. A cam carrying slide member slides reciprocally on the press. A reciprocating mechanism is connected to one of the carriers in each pair and there is a reciprocal motion producing cam on the slide member acting on a cam follower to drive a connecting rod connected to the one carrier for reciprocatingly driving the one carrier. An elevating mechanism elevates the feed bar receptacles by an elevating plate and a linkage, and a rotation producing mechanism rotates a splined shaft to drive the linkage.
摘要:
A link mechanism for driving a slide in a machine press has a pivot pin with an adjustable position for varying the die height and the stroke length of the slide. A first link of the link mechanism is connected to a sliding member which is restricted to vertical movement in a groove. Another end of the first link is pivotally connected to a second link and a third link. Another end of the second link is pivotally connected to the pivot pin. Another end of the third link is connected to a plunger which is connected to the slide. The plunger is movably held in the machine press and restricted to vertical movement. The up and down motion of the sliding member is translated through the first link, second link, and third link into the up and down movement of the plunger and the slide.
摘要:
The transfer press has a blank-supply mechanism for supplying blanks which are materials for every kind of part to be manufactured by pressing, one by one to a press, a blank-transport mechanism for carrying blanks from the blank-supply mechanism to the press, a transfer feed mechanism for feeding blanks that have been supplied to the press one by one to dies of each stage along the bed of the press, a die exchange mechanism for exchanging dies when different parts are to be manufactured, a feed bar exchange mechanism for removing and exchanging feed bars which are a part of the transfer feed mechanism, when dies are to be changed, a die cooling oil circuit connecting mechanism for connecting a cooling circuit to a newly placed die in order to cool it, a pressure adjusting mechanism for die cushioning mounted on the bed of the press, and a program control mechanism for the automatic operation of the press, which controls the above-described mechanisms as well as the press in relation to blank supplying and manufacturing conditions.
摘要:
A die change mechanism in a transfer press is disclosed for carrying feed bars with dies supported thereon into and out of the press. The mechanism performs cyclic clamping, advancement, unclamping and return movements on the feed bars which feed work pieces to and through the successive processing stages of the press.
摘要:
A work transfer and drive device in a transfer press is disclosed having a stationary shaft supported in the framework of said press and an actuator gear rotatably mounted on said shaft to be driven by the drive means of said press. A sun gear is mounted on said shaft in coaxial relationship to said actuator gear, a planetary gear is secured to an eccentric shaft on said actuator gear in meshing with said sun gear, and a first eccentric pin integral with said eccentric shaft is slidably received in a radial groove formed in a rotary member rotatably mounted on said stationary shaft. A second eccentric pin in said rotary member is operatively connected to a first slidable member to be guided by a stationary guide bar parallel to feed bars and a second slidable member is operatively connected to said first slidable member and one of feed bars.
摘要:
A transfer press provided with a three-dimensional transfer system and a moving bolster. In the press, there are provided one each of four corners of the bolster an advancing/returning unit for performing an advancing/returning operation on a workpiece, a clamping/unclamping unit for performing a clamping/unclamping operation on the workpiece and a lifting/lowering unit for performing a lifting/lowering operation on the workpiece. The units include motors that make it possible for the bolster to carry a pair of feed bars thereon and permit the units to perform their operations even when the bolster is outside the press.
摘要:
A crankshaft mechanism for use with a press having a slide member, which includes an eccentric crankshaft. In one form of the mechanism, the crankshaft has a cylindrical eccentric portion. An eccentric sheave is rotatably mounted on the circumference of the eccentric portion so that its center is displaced radially from the center of the eccentric portion. A connecting member is rotatably mounted on the circumference of the sheave. The eccentric portion, sheave, and connecting member have pin-receiving bores whose axes intersect the crankshaft axis. The bores in the crankshaft and connecting rod are both aligned with the sheave bores when the crankshaft and the sheave are in predetermined angular positions. Lock pins in the eccentric portion bore are selectively engageable with the sheave bores to fix the sheave to the eccentric portion. Lock pins in the connecting rod bore are selectively engageable with the sheave bores to fix the sheave to the connecting member. By the selective engagement of the lock pins, the sheave is selective fixed to either the crankshaft or the connecting rod and freely rotatable with respect to the other. In a second form of the mechanism, the crankshaft includes two arm portions between which is connected a first eccentric section, including an eccentric crank-pin portion. A second eccentric section includes an eccentric sheave formed in multiple pieces and mounted on the circumference of the crank-pin portion. A ring member is fitted over the pieces of eccentric sheave to integrate them on the crank-pin portion.