DD294649A5 - DEVICE FOR DISCONNECTING STAIN DEVICES IN A SINGLE STAGE OF LOW BARRIER - Google Patents

Abstract

The invention relates to a device for separating sheet metal, in particular of stamping waste in a way that reduces the bulkiness of the waste and allows a better utilization of the means of transport. The invention has for its object to provide a pair of scissors for cutting waste grids of bands and strips, which decomposes the stamping waste into small compact pieces with very little effort, without additional weitern drive without increasing the force. Fig. 1 {separation of sheet; Lead frames; Press table; Scrap shears}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a device for separating Bisch, in particular of punching waste in a way that reduces the bulkiness of the garbage and allows better utilization of the means of transport.

Characteristic of the known state of the art When cutting blanks and blanks from sheet metal strips or strips, the waste is not necessarily small Single pieces before. Often, a so-called stamped grid arises.

For the disposal of this lattice-type waste two basic methods are known:

It is known to rewind the punched grid with a rewinder and so to recycle. For very thin and narrow bands, this method is used with good success. The difficulties increase with increasing strength and stiffness of the bands, e.g. B. at medium and large Band cross sections. In order to obtain a safe handling waste coil, it must be wound tightly. The necessary Belt tension has a negative effect on the positioning accuracy when using follow-on tools. Especially critical

this is when the roll feed is released to achieve certain accuracies in search pen application

For such a technology are then increased expenses to make z. B. Bandzuggeregelte Aufrollhaspel, controlled Retaining roller pair and belt loop after the tool. Another solution for punched grid removal is the cutting with a special trimming shear. In addition to waste scissors with self-propelled for bands of small cross-section, z. B. DD 269800, are preferably

Press ram driven trash shears used.

As a result, the scissor lift are synchronized with the press and a cut exactly at the weakest cross section of the Waste grate possible. The disadvantage of cutting the grates, especially wider strips, are very large double-T shaped remnants, which are very bulky

are, in the waste container vorhaken and thereby require much more transport space than required, frequent

Changing the container and weight-unavailable transports require. Object of the invention

The object of the invention is to provide a pair of scissors for cutting waste grids of ribbons and strips which breaks them up into small compact pieces of low bulkiness and thereby considerably increase the filling mass of the scrap container.

Explanation of the essence of the invention

The invention has for its object to provide a pair of scissors for separating waste grids of bands and strips that decomposes with very little effort, without additional further drive without increasing the force d: e punching waste into small, compact pieces

 According to the invention the object is achieved in that in a known manner on the press table a

Waste shears is arranged, which is actuated by a lever from the descending plunger near the bottom dead center, which is arranged so that the first shearing blade to separate the waste grid approximately in the region of its weakest cross-section and that at preferably right angles to the first shearing blades to the first Schermesserern second shearing blades are arranged, which are operated together with the first blades and cut in the longitudinal direction of the punching waste whose webs, these second shearing blades are arranged so that they take effect only after the cutting operation of the first knife, thereby avoiding a summation of the cutting forces and after the cut of the second blade a trouble separation of the parts of the punching waste is made possible.

embodiment

The invention will be explained in more detail using an exemplary embodiment. In the drawings show

1 shows a device for dividing the punching waste in side view, 2: the device of FIG. 1 in Rtg.X, 3 shows a punched grid with the courses of the cuts to be arranged. The basic form of the invention is shown in FIG. On the press table 1, the litter shears with its base plate 2 is attached. The base plate 2 carries the knife chair 3, the

at the same time formed as a lower punched grid inlet guide 4 and carries the lower blade 5 of the first pair of shearing blades. In the outlet direction of the stamped grid 6 is the knife chair 3 another, the lower blade 7 of the second

Schermesserpaares, in such a way that the course of the cutting lines of the first and the second knife pair

preferably form a right angle, arranged.

According to Fig. 2, two guides 8 are further fixed in the knife chair 3, 9 guided by which the movable blade carrier linear In the guides 8 arranged springs 10 push the blade carrier 9 upwards. The knife carrier 9 itself, FIG. 1, is designed as a guide for the sheet demold holder 12. This takes over with his front Contour the function of the upper punched grid inlet guide 11. At the movable blade carrier 9 are analogous to the knife chair. 3

the upper blade 13 of the first cutting blade pair and another, the upper blade 14 of the second cutting blade pair, in such a way that the course of the cutting lines of the first and second cutting blade pair preferably forms a right angle, respectively.

The arrangement of lower blade 7 and upper blade 14 is bemnssen so that the shortest distance between their Cutting by at least the size of the sheet thickness of the lead frame 6 is wider than the largest distance between the lower blade. 5

and upper blade 13 of the second pair of cutting blades.

The upper blade 13 and 14 are together with the movable blade carrier 9 by springs 10 in an upper position

held and moved towards the end of each ram stroke of the press by the plunger 15 via the lever 16 and connecting rod 17 down. The lever 16 is supported via the tie rod 18 on the base plate 2 of the litter scissors. By the lesser

Distance between the first cutting knife pair 5, 13 with respect to the second cutting knife pair 7, 14 becomes a cut first

along the line l-l of Figure 3 executed.

The resulting, bulky, often double-T-shaped waste piece is in the further decline of the plunger by the second Cutting knife pair 7.14 with a section along the line H-II divided into two relatively compact remnants, so in the Waste container take up much less space.

Claims (3)

1. A device for separating punching waste in individual pieces low bulkiness, arranged on the press table with a jaw, which is actuated by a lever from the descending plunger near bottom dead center, characterized in that arranged on a first pair of blades for cross cutting the punched grid, a second pair of knives is that cuts the separated from the first pair of knife punched lattice pieces at an angle to the section of the first pair of cutting blades in sections that upper and lower blade of the second pair of knives attached to the upper or lower blade of the first pair of blades or their recordings, movable blade carrier and knife chair are and that both pairs of knives are actuated by a common drive. 2. An apparatus for separating punched screens in individual pieces low bulkiness according to claim 1, characterized in that in any position of the movable knife, the largest distance between the cutting edges of the first pair of cutting blades is smaller than the smallest »distance between the cutting edges of the second pair of cutting blades. 3. A device for separating punched screens in individual pieces of low bulkiness according to claim 1 and 2, characterized in that further pairs of blades are arranged in the same distance ratio to the previous pair of blades, as the first pair of blades is arranged.