CS249481B1 - Sheet bending machine's bending die with anti-pulling-over device - Google Patents

Abstract

The solution relates to a bending jaw of a bender on a sheet metal equipped with a non-destructive safety lock overload device. This is achieved by the bending body the jaw is stored at least in two places on the eccentric pins that are rotatably mounted in a transverse beam and each of which is firmly attached to the cam on which twisting when bending jaw is retracted a moment. The cam circumference is cut out into which the swivel castor fits. This pulley it is fixed at the end of the pivoted mounted the lever held in the normal position by the forearm power members. When the holiday is exceeded bending force forces are formed on the cam Such a great torque that the swivel pulley it is extended from the oblique cutout in the perimeter the cam and the body of the bending jaw moves against the beams. In the ease the jaws of the prestressed force members returned all mecnanism into the flood position, what it is immediate device ready for the next activities.

Description

249481 2

The invention addresses the bending jaw of a sheet bender with an overload device that protects the bending jaw and the machine from overloading. Embodiments of bending jaws are known which are protected against crushing by breaking fuses. These fuses are designed in such a way that, when the permissible load is exceeded, the breaker inserts are broken through which the bending force is transferred from the jaw to the machine frame.

The disadvantage of such a solution is the high cost of manufacturing and testing the fuse-links, delaying the replacement of broken inserts for new and the need for re-sorting the machine.

These drawbacks are solved by a solution according to the invention, the transverse support being adjustable in the swinging arms of the bending machine at least on two exentric pins of the bending jaw body itself, by allowing a removable displacement of the bending jaw body relative to the transverse beam.

The attachment of the bending jaw body to the exentric pins causes the torque to be generated when the bending force is applied to the eccentric pins. On the rotatable eccentric pin, there is a cam with a cut-out into which a rotatable pulley mounted on a pivotably mounted lever, supported by an adjustable support, is inserted and prestressed by a flexible force member.

The outer surface of the cam, after which the pivot roller rolls when the locking device is actuated, is shaped such that, after the bending jaw has been detached, the biasing force of the resilient member through the pivotable lever and the pivot pulley forced the cam to return to its initial position. Thus, the safety device is automatically ready for further operation.

The device increases the productivity of the work, there is no need to re-dilute the machine. An example of an embodiment of a bending jaw of a sheet bender with an overload device according to the invention is shown in the accompanying drawings, wherein FIG. 1 shows the bending jaw so that the side of the bending jaw is in an unstretched state and the right side shows the overload when the fuse has already tripped. FIG. 2 is a cross-sectional view of the jaw shown in FIG. 1 as A-A.

While the bending force acting on the body of the bending jaw does not exceed a predetermined size, the eccentric pivot pins 2 transfer the retraction to the transverse beam 2 in which they are mounted and the hinged arms 1, wherein the cams 2 provided with the recess 2 and fixedly connected to the rotary eccentric pins 2 are held in equilibrium The pivoted levers 7 are mounted on pegs 11 fixed in the transverse beam and are held in a fixed position by the prestressed elastic force members 9 and supported by the adjustable carriages 10.

When exceeding a predetermined force that can be transmitted by the bending jaw and the size given by the bias of the biasing force members, it also generates a great torque on the eccentric pivot pins 2 and thus also on the cams 5 that the pivoted levers 7 are rotated against the biased elastic force members 10 and to extend the rotating bars 8 along the inclined abutment surfaces from the cutouts 6 in the cams 5. At the same time, the body of the bending jaw 2 is moved relative to the transverse beam 3, the eccentric pivot pins 2 together with the cams 5 'continue to rotate and the rotary rollers as and roll around the circumference of the cams 2 »Wherein these movements take place at. acting less force than the set bending force that the jaw can carry.

The overload condition is sensed and the machine drive is stopped. The entire device returns to the flood position automatically after the bending jaw body 1 has been detached, i.e. at its sleep, when the force exerted by the prestressed elastic force members y, via the pivoted levers 9

Claims (1)

The bending machine of the sheet-bending machine with an anti-overload device comprising two suspension arms carrying a crossbeam on which the bending jaw body is mounted so as to allow the bending jaw body to move relative to the crossbeam, wherein the bending jaw body is supported on the crossbeam, characterized in that each of these eccentric pivot pins (2i) is rigidly connected to a cam (5) provided with a cut-out (6) on the circumference, in which a pivotable pulley (8), supported by a pivotably mounted lever (7) 11) is supported in the crossbeam and is held in position by a biased elastic force member (9) and supported in an unloaded state by an adjustable support (10).