DE3311270A1 - Cutting device for automatic cutting of a protective film web continuously laminated onto consecutive workpieces of the same thickness and width and any desired length, in a manner exactly coinciding with the mutually adjacent edges of the aforementioned workpieces - Google Patents

Abstract

The problem exists in practice of cutting protective film continuously laminated onto individual workpiece formats between the formats. The cutting carried out according to prior known processes with film sections projecting over the workpiece edges on both sides of the cutting point leads to difficulties in further processing. According to the invention this problem is solved in that the cutting device - a roll, sphere or spring steel tongue - can freely adjust to the position of the workpiece edges. If this cutting device is then pulled through the gap under slight pressure it uses the two workpiece edges themselves as counterparts to two pinch-off lines. The film is pinched off directly at the workpiece edges with extremely low forces and cut out as strips. The workpieces are supported from below only at the instant of cutting so that damage during the further transport is eliminated. The process is suitable for cutting with halting of the workpieces but also for flying cutting without halting.

Description

Bi: υc-hype

Known cross-cutting devices of this type work with a down-swinging Sügox.ulinmosscr or hot wire. Here, the film is separated once between the two workpieces, so that a film overhang of approx. 5 mm remains on both sides of the inner parts. The film overlays can stick together when the sheets are stacked in the crate. When the metal sheets are later removed, this causes the protective film of the respective underlying workpiece to be peeled off. By connecting the film protrusions of the stacked sheets, the edges of the sheets are kinked, especially in the case of thin workpieces. In order to avoid damaging the sheets, the operating personnel is forced to cut off the excess film by hand before removing the sheets from the crate. The time required for the subsequent cutting off of the protruding film is considerable. Another disadvantage of the film overhang on the workpiece cutting edge is the difficult peeling off of the film when the workpieces are later edged. The film overhang can also stick to the back of the workpiece edge and is then only possible if the workpiece surface is damaged? deduct. The overhang of the film can be ebonfallr; Glue to the following lower support roller blind of the film coating machine, whereby on the; Workpiece, especially with thin sheet metal, can wind up on the lower support roller ler film coating machine.

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BAD ORIGlNAU

Example of a design with a separating tongue made of Kedor steel

Figure 1) shows the side view in the running direction of the coated sheets, ie t renn s ind.

The piston rod loose cylinder 1 'rebukes, i guides and moves the Ti ..:',
device 2 with the resiliently adjustable suspended knife 2-i :>'■■ ■ the fastening cylinder 2b. In the rest position the knife.-Tw-j lies parallel to the sheet metal surface. In the working position j; the cylinder 2b pivots the knife 2a about the pivot point 2c downwards so that it rests with its side edges 2d, 2d on the two edges of the metal sheets 3a, 3b. The suspension of the pivot point 2c is designed so flexibly that the knife tongue rests securely on both sheet metal edges even if the separating gap is laterally offset. At the same time, the two support strips 4a, 4b are pneumatically moved from below under the sheet metal, the distance between them being greater than the separation gap, even when adding up all tolerances for the distance 3a - 3b and their position relative to 2, so that the support of the sheet metal edges 3a, 3b is guaranteed without impairing the function of the knife 2a. At the same time, the counter roller blind 5 swings in from below.
If the separating device 2 is moved by the cylinder 1 in the direction of the arrow, the film strip is separated out between the Bluchkant.cn and is wound onto the roll 5.

Figure 2) shows a plan view of the separation point without the cylinders 1 + ? 'O, in order to clarify the design of the separation unit 2.

Figure 3) shows the section through the separation point.

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Claims (1)

^patont '"or Oo.-s3 Name: Separator for the automatic separation of a consecutive work '; L -' .. · ^: ■ of the same thickness and width and any length continuous · ml ..i :: '-; ■! einnr. --- .- r facing edges of the workpieces mentioned. Claim 1) separating device, characterized in that the sharp, each other in aT. determined distance opposite edges of the Workpieces themselves represent the Gogenkanten for the Trer.r.tool. Claim 2) embodiment according to claim 1, characterized in that the separating roller from the coating side (here referred to as "above", but all directions are possible) presses with adjustable force on the film to be separated. I. Claim 3) embodiment according to claim 1 + 2, characterized in that the Separating roller automatically moves to the middle between the sheet metal edges adjusts and the separating force is evenly distributed over both separating points, so that the film on both sides between the separating roller and Workpiece edge is squeezed off. Claim 4) execution according to claims 1-3, characterized in that c.ie the upper separating roller using suitable transport and guide means the entire length of the cutting edges is passed, whereby they are due to the type of suspension even if they are not exactly parallel. Cutting edges find their right Laqe themselves and the foil .lui securely separates both sides. Claim 5) Design according to claim l '· - 4, characterized in that öao is pressed simultaneously with the separation roller from the top of unten'eine counter roller against the coating film, and moved together with the Trennrcllo. BATH ~ -— °° ^ΡΥ Claim 6) embodiment according to claims 1-5, characterized in that the Separating device at the end of the separating path lifts off and the sheet metal during the return of the Tienneinrichtung already transported on again can be. Claim 7) embodiment according to claim 1 - 6 / characterized in that instead The roller can also have a flat tongue made of spring steel, which is slightly tapered, with its side edges Placed on the sheet metal edges at a small angle on both sides. Due to the small contact area of the spatially edges of sheet metal and tongue running at an angle to one another also result in low absolute forces high specific surface pressures, which are sufficient to separate the film and the tip of the tongue, which moves further between the sheets, presses the separated one Strip out. Claim 8) execution according to claims 1-7, characterized in that both sides the separation point at the moment of separation from below pneumatically support strips are driven against the sheet, which the Record separating pressure. These bars are lowered again in the rest position when the sheets are transported further, so that a Damage to the rear of the sheet is excluded. Claim 9) embodiment according to claims 1-8, characterized in that for A cylinder without a piston rod - e.g. "LINTRA" -Hy 1 inder - is used for the transverse transport of the separating device, v / elcher in one component takes on both the power generation, the power transmission and the management of the running separation unit. Claim 10) embodiment according to claim 1 - ^- 8, characterized in that the separating device is not stationary installed in the machine, sondo t η · .lucl.r is movable in .the direction of the sheets so that eggs Tri'iinvo rgang without? Stopping the Hleche can be done. BAD ORIGINAL '. ⁰⁰ ^ i 331127 Claim 11) embodiment according to claim 1-0, characterized in that ·.! L:. · From the trailing edge de ;; Front sheets, the front edge de :; subsequent Blochey and from the separating device "urü;: kgeLe;: .. · ι wave precisely recorded and via a ütcucrcli-kl ronik with ei ti.inder. ν · ■ similar and .juscjorugolt v.'erden,:; o d. i'j liii.il-h.'i'in itj from lien Ai ■ :: f -. the canton to: M.-iijch Lnci her Ab..tund .in tier 'i'rcnri.-Jt · .. · I L-lui d their Γ..κΐ ' ^% xu der in it Lau [' enden Trenneinr i cht.unq Lrrarie) fju-i ": ^1. -held v / earth-n. BAD ORlGtNAL COPY