DE1602470C - Press brake - Google Patents

Description

Ί 602

lower transom 13 are attached. It can also firmly screwed press cylinder 8 with im Cylinder movable piston rod can be used.

The other end 9 of the lever arm 5 is connected to the press beam 11 via pressure stilts 10, who works on the die 12.

The side stands 1 and 2 advantageously have the rocker arm 5 on one side and the lever arm 5 on the other Page, the press cylinder 8 on.

Due to the freely selectable distance between the two bearings for the shaft 3 of the lever arm 5 to the Pressure stilts 10 of the press beam 11 and, on the other hand, to the connection points of the two press cylinders 8 can without any difficulties a stroke that is just as large as with fully hydraulic constructions be achieved. In addition, a selectable greater length of the lever arms from the shaft bearings up to the cylinder connection points a reduction in the cylinder drive force compared to the actual one Pressing force reached.

As a result, the piston diameter of the press cylinder can be much smaller than direct-acting short cylinders are held, of course with a correspondingly longer stroke .. The smaller press cylinders are cheaper and the longer stroke causes relatively low additional costs.

Due to the fairly large distance between the shaft bearings for the lever arm 5 to the press beam 11 if the overhang located underneath in both side stands is not or only slightly stressed, see above that the uprights do not spring up above the projection, or spring up much less than with a fully hydraulic arrangement.

1 sheet of drawings

Claims (2)

1 2 Central eccentric of the crankshaft attacks the piston claims: rod of a pressure cylinder that causes a stroke of the tappet bar. 1. Press brake with two side stands and the object of the invention is to provide a two press cylinders in which to create 5 press brake in the side stands, which is a simple Aufeine the stator connecting the torsionally stiff shaft construction, and the parallel bearing with two press cylinders is where every side stand between the press beam and press table is located near each side stand a lever that can be pivoted parallel to this is held. swing arm is arranged, the end of which with the This task is with a press brake with Press beam is connected, thereby marked io a torsionally rigid bearing in the side stands draws that the other end of the lever shaft, which connects the stand and the lever arm (5) with a torsionally rigid, parallel swing that pivots at one end are connected to the torsionally rigid shaft (3) arranged'transverse with the press beam, thereby after bar (6) is connected, at the ends of the pressing of the invention solved that the other end of the Hezylinder (8) attack. 15 swing arm with a torsion stiff, parallel to the 2. Press brake according to claim 1, characterized by a torsion-resistant shaft arranged crossbeam, that the side stand (1 or -2) is bound to the ends of which press cylinders engage, on one side, the lever rocker (5) and on the other whose side has the press cylinder (8). Advantages of the crossbeam that supports the rear lever ao that the rocker connects positively, in that . simple connection options for two term press cylinder also outside of the side stand or are available for a central press cylinder.
35 It is further provided according to the invention that the The invention relates to a press brake with two side stands on one side, the lever arm and side stands and two press cylinders, in which the press cylinder has on the other side,
the side stands a gate connecting the stands. Sion-stiff shaft is mounted on the near each rope part that the rear crossbeam, which verts the lever each one parallel to this pivot binds, a torsion of the shaft when off-center bare lever rocker is arranged, the end of which avoids press loading or reduce it so far Press beam is connected. ■ changes that with the arrangement of two press cylinders Fully hydraulic press brakes are known. Parallelism between the press beam and the press table You are sensitive to eccentric press pre- mechanically maintained,
corridors and one-sided loads. To compensate 35 Without a connecting crossbeam, which can be made of common compensating rods and control valves, cheap and unprocessed structural steel, in order to withstand the one-sided loads on the press beam, the shaft would have to compensate an unacceptably large amount. They usually only respond when they have a small diameter, so that inclination has certainly occurred with high compressive forces. Also to be hydraulically sufficiently torsionally stiff. In addition, the pumps with several stages have been provided for each 40 connecting crossbeams of the very press cylinders at low cost in order to meter the amount of oil in a rigid and heavy-weight manner for each press cylinder very precisely. This det is the advantage that it serves as a counterweight to the control devices are very expensive and störan- press beams. This means that it can also be simply thrown. . kende press cylinders (plungers) are used at It is also known in two-cylinder folding presses 45 to which only the piston surface is acted upon, because sen the piston rods directly with the press beam to the return can be made by the counterweight, associate. An inclined position of the press beam can The longer lever arm of the lever arm, the cannot be prevented. The hub can, however, be firmly connected at the end to the crossbeam be chosen large. Another advantage of the Swiss is that it can be chosen in any length see patent specification 276480 a press brake can be 50, making relatively small press cylinders with knows that provided with one-armed lever arms correspondingly reduced pressing force and longer that swivel parallel to the side stands and the stroke that is attached to / Grip above the press beam with a torsionally stiff one, a multiplied pressing force on the press-ball shaft are coupled and exercise a .Parallelführung, des ken. Effect press beam. The parallel stroke movement 55 In the drawing, the subject of the invention is shown in relation to the press table by means of an exemplary embodiment with the lever pivot. It shows
gen connected, directly perpendicular to the Preßbalkeri F i g. 1 erne top view and acting press cylinders, which in their compressive force Fig. 2 is a side view. according to the desired pressing force dimensio- In the two side stands 1 and 2 is the gate- are ned. A synchronism of the press beam is supported by a 60 stiff shaft 3. On the protruding the only wave not always guaranteed. Terminals 4 are connected to control organs. On the It is from the German patent specification 1107 622 shaft 3 is near the side stands 1 and 2 each one a hydraulic press brake known, which is fastened between lever rocker 5, which at one end . see two side stands carrying a tappet beam, connected to a cross beam 6. To the free ones which is perpendicular to the press table and 65 ends 7 of the crossbar 6 each engages a press cylinder by means of crank webs, which are on eccentrics of the 8 ah. The press cylinder 8 can be pivoted directly udder arranged below the press table on the side stand 1 or 2 or on both sides on the outside Belwelle are stored, moved up and down. On one of the side stands 1 and 2 firmly connecting