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:
A method for hydraulic control of a toggle lever press in which the velocity of a driving piston rod is increased at least once in the working region of a press ram. The velocity of the press ram is thus kept relatively constant up to bottom dead center (or upper dead center) of the press ram. A toggle lever press has a control adapted for carrying out this method.
摘要:
A punching press according to the present invention employs a servo motor as the driving source of the punching operation to achieve fine control, and exhibits a performance which is equivalent to or higher than that of a conventional punching press which employs a hydraulic cylinder. A hammer member which performs the punching operation is coupled to a stroke member which performs a stroke motion. The stroke member is coupled to a motion converting unit which converts the rotational motion of a servo motor into a stroke motion.
摘要:
In a method of operating a press machine having a servomotor (20) and a servo controller therefor, the tool stay substantially still immediately after the completion of working a workpiece for a period of from 0.05 to 2 seconds and also the speed of the tool applying an impact to the workpiece for working is decelerated immediately before the tool strikes against the workpiece in order to reduce the noise generated when the impact is applied. The speed and positional locus of the ram (36) are set for each step using respective setting switches provided on a panel. The servomotor (20) is program-controlled according to the data input through the respective setting switches.
摘要:
Wherever large forces have to be applied over short distances it is useful to employ a force multiplier device. Very large transmission ratios are, according to the present invention, obtained by interruption of the axis of rotation (2) and insertion of an only slightly displaced force transmission axis (4). The force transmission axis (4) can be continuously displaced to both sides of the axis of rotation (2) by means of positioning facilities, preferable an adjusting screw (5) or two wedges. This way variable force generation is obtained with a widely variable range of transmission ratio.The invention can be employed e.g. for the manufacture and operation of presses, clamping, bending and tension devices.
摘要:
An apparatus for attaching a fastener such as a snap closure composed of a first fastener member and a second fastener member to be combined together through a web-like material such as a fabric therebetween, includes a lower pocket mechanism for supporting the second fastener member thereon, a punch mechanism movable toward the lower pocket mechanism for fixing the first fastener member to the second fastener member with the web-like material interposed therebetween, and an upper pocket mechanism for supporting the first fastener member, the upper pocket mechanism being movable toward the lower pocket mechanism and having means for centering the first fastener member in alignment with the second fastener member. A safety mechanism is operatively coupled with the upper pocket mechanism for actuating the punch mechanism only when the upper pocket mechanism reaches a predetermined position with respect to the lower pocket mechanism. A feeder mechanism has first and second hoppers for storing the first and second fastener members therein and first and second pickup means movable rectilinearly for feeding the first and second fastener members out of the first and second hoppers into the first and second pocket mechanisms, respectively.
摘要:
A drive arrangement for a high speed mechanical press, especially a high speed cutting press, wherein the press drive includes two eccentric shafts connected by connecting rods with a slide. Mass balancing weights are provided for enabling a complete dynamic mass balancing, with the weights being articulated by additional rods and being moved in a direction opposite to the slide. The drive further includes at least three pairs of toggle or knee joint link arrangements, with the first arrangement being nearly horizontally disposed, the second arrangement being nearly vertically disposed, and the third arrangement being nearly vertically disposed and connected on the one hand with the slide and, on the other hand, with the mass balancing weights, with the pairs being arranged symmetrically with respect to the eccentric shafts.
摘要:
A spacing adjustment and overload releasing mechanism in a stamping press having a base and a crown spaced from one another and a ram operating therebetween, in which posts interconnect the base and crown and the spacing between the ram and base is adjustable by a nut and collar disposed on opposite sides of the crown, and a fluid operated means such as a hydraulic cylinder for each of the posts disposed in the base applies pressure urging the crown and base toward one another at substantially equal pressures, greater than the normal pressure applied by the ram, but at a pressure sufficiently low that it is within the load capacity of the press frame. The nut and collar provide the initial adjustment between tool sections operated by the ram and base while the fluid operated means provides an overload release in the event excessive pressure is applied by the ram.
摘要:
A drive for operating a punching tool comprises a toggle-joint lever to one of whose lever members the punching tool is operatively connected. The second lever member of the toggle-joint forms part of a quadrilateral linkage. This linkage consists of the second lever member, a first transverse lever member linked at one end to the second lever member and at the other end to another lever element, and a second transverse lever member linked at one end to the other lever element. The first transverse lever member is a two-armed lever supported on a fixed pivot near its linkage to the second lever member for pivoting the two-armed lever about the fixed pivot. The second transverse lever member and the other lever element are linked to a crank drive.
摘要:
A press having both upper and lower punch operations with controlled action stroke for both upper and lower punches slidable in opposed directions with relationship to a multiple cavity die plate. The upper ram and punches are operated in the downward stroke by a toggle and rocker arm mechanism which incorporates a readily adjustable eccentric means for controlling the length of upper ram stroke. The mechanism further includes a combination of first and second class levers which are cam driven in a cyclical press operation.