RU2114003C1 - Method and apparatus for producing blank developments with compound perimeter - Google Patents

Abstract

FIELD: packaging engineering. SUBSTANCE: method involves fixing blank by retaining it by means of pressing member on immovable plate configured to correspond development form; cutting out blank development by cutters, with rotating cutter blades successively cooperating with immovable plate edges. Apparatus has plate configured in accordance with form of blank development and defining counterknife. Two sets of cutters are mounted on two parallel shafts, which are positioned at both sides of plate and rotate in opposite directions. Cutters are arranged so as to provide scissor-type cutting of blank. EFFECT: increased efficiency and enhanced reliability in operation. 3 cl, 4 dwg

Description

 The invention relates to packaging machinery, in particular to the industry that produces cardboard boxes for packaging industrial and food products.

 Typically, the boxes have a prismatic shape (Fig. 1), the sides of which are indicated, for example, by the letters a, b, c. To make such a box, it is necessary to carve a reamer of the future box from cardboard, assemble the box by folding individual elements along the lines indicated in FIG. 2 by a dashed line, and connect them into the three-dimensional structure by the glue or glueless method.

 A known method of manufacturing reamers punching or cutting [1]. To obtain the scan depicted in FIG. 2, cutting is not used due to the complexity of manufacturing such a stamp.

 The method of punching consists in cutting a reamer of a future box using a special mold on punch presses.

 It is known that firms are equipped with molds [2], consisting of base 1 (Fig. 3) (usually multi-ball glued plywood) and punching knives 2, tightly installed in the slots of the base and creating a cutting edge according to the configuration of the reamer. The die-cutting form is fixed on the upper plate 3 of the press and lowered with it onto a cardboard blank 4 lying on the surface of the lower fixed plate 5. The reamer is cut by penetrating the sharpened edges of the knives into the material of the blank 4 before contact with the plate 5.

The disadvantages of the punching method are as follows:
since the edges of the knives are in the same plane during punching, there is a sharp increase in effort (in fact, an impact occurs);
over time, the edges of the die-cutter become dull (instead of cutting, cardboard is crushed), the forces necessary for punching increase;
special materials are necessary for the manufacture of the die: special thin knives and high-quality thick plywood;
to perform punching, powerful presses or crucible printing machines of a heavy type, having a significant mass, are required;
low productivity of punching presses, since the pressing surface performs a reverse movement (the punching operation occurs during the curing of the material);
die-cutting and creasing (perforation) are carried out simultaneously, which is the reason for the increase in technological loads;
the inability to use the die for the manufacture of reamers of boxes of other sizes;
long manufacturing time of the die;
for equipment maintenance, highly qualified personnel are required.

 The closest analogue of the invention is a method and apparatus for producing a reamer of complex configuration along the perimeter, in which cutting is performed by passing a mold mounted on the conveyor belts with a workpiece fixed on it between the device shafts. In this case, sequential cutting of the workpiece is carried out during the interaction of the form knives with the shaft surface [3].

 However, most of the above disadvantages in this technical solution are not resolved.

 The basis of the invention is the task of creating a new, simple energy-saving method for cutting box sweeps and a compact, small-sized device for its implementation, in which the workpiece is in a fixed position, the cutting knives rotate and this ensures sequential cutting of pack sweeps with minimal effort.

 The problem is solved in such a way that the method of rotary cutting of sweeps consists in replacing the punching process simultaneously along the entire perimeter of the sweep with a sequential scissor cut process (counter-knife). A device for implementing this method, having a mounting plate and a clamp for fixing the workpiece, cutting knives, according to the invention, is equipped with separate movable knives, fixed in such a way that their cutting edges interact with the edges of the plate during rotational movement of the knives.

 A method for cutting sweeps of a complex configuration is that knives for sequentially cutting the sweep of a bundle are fed to a material fixed to a plate having a sweep shape.

 A device for cutting reamers of complex configuration along the perimeter consists of a fixed base (plate) 1 (Fig. 4) having a reamer configuration, material 2, drive shafts 3, 4, sets of knives 5, 6 fixed in series on the shafts, clamp 7. Each the knife in the plane of the cut forms an angle α with the plane of the material to provide a scissor cut.

 The device operates as follows.

 On plate 1, workpiece 2 is fixed to prevent shear by clamping device 7. On both sides of the plate are two shafts 3 and 4 with sets of knives 5 and 6 fixed to them for cutting individual curly sections of the scan. Each line of the contour of the scan corresponds to a knife. A shaft with knives is made monolithic or composite of separate knives, which are mounted on it in such a way as to ensure sequential cutting of the contour of the sweep around the entire perimeter with a scissor cut. When rotating shafts 3 and 4 with knives towards each other, for example, shaft 3 counterclockwise, shaft 4 - clockwise, sets of knives 5 and 6 fixed on them, having cutting edges at an angle to the workpiece plane to provide a scissor cut, consistently enter in contact with the workpiece and interacting with the lateral edges of the plate 1, as with a counter knife, cut the sweep from the workpiece along the contour of the plate, while the waste falls down. After cutting, the scan is released from the clamp 7 and is removed from the device.

The main advantages of the invention:
replacing simultaneous punching with sequential cutting;
insignificant technological efforts necessary for cutting the workpiece;
a device for obtaining a workpiece sweep in a rotational manner consists of a certain number of individual knives, which are relatively easier to manufacture;
the ability to quickly replace individual knives, their regrinding;
lack of inertial loads in the device;
the simplicity of the design of the device, the cheapness of its manufacture;
small dimensions of the device for rotary cutting of the workpiece and weight;
lack of need for specific materials necessary for the manufacture of die-cutting forms (thick high-quality glued plywood, special high-quality calibrated knives);
the ability to use separate knives for cutting other workpieces when matching sizes;
preparation of the device for cutting the workpiece requires little time (within 15-20 minutes).

 Literature.

 1. Germanies E.G. Reference book of a printing technologist. - M .: Book, 1982, p. 336.

 2. Production lines SPO 1600, SPO 2000 for printing and die-cutting packaging from corrugated and compact cardboard. Prospectus of the company "Bobst" Lausanne, N 8701.

 3. US patent 4643062, class. B 26 F 1/42, 1987.

Claims (2)

 1. A method of manufacturing a reamer of complex configuration along the perimeter, including fixing the workpiece, cutting out a reamer of complex configuration and removing it from the cutting zone, characterized in that the workpiece is fixed by fixing it with a clip on a fixed plate having a reamer configuration, and the reamer is cut with a scissor cut during the sequential interaction of the cutting edges of the knives making a rotational movement with the edges of the plate.  2. A device for the manufacture of reamers of complex configuration along the perimeter, consisting of a bed, a clamping device for the workpiece material and cutting knives, characterized in that it contains a counter knife made in the form of a fixed plate having a reamer configuration, the cutting knives consist of two sets installed on two parallel shafts located on both sides of the plate, counter-rotating, the knives of each set have cutting edges at an angle to the workpiece plane for providing a scissor cut during the sequential interaction of the cutting edges of the rotary blades with the edges of the plate, and the knives on the shafts are set so that the interaction with the plate of each next knife occurs after the previous one has finished cutting.

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