RU2135362C1 - Device for manufacturing foldable cartons - Google Patents

Abstract

FIELD: packing. SUBSTANCE: device has cutout unit consisting of movable plates fitted on cranks and forming together full-swing articulated four-member mechanisms executing rotary-parallel movement symmetrically relative to blank material. Ratio of radius R, m of cranks and length L, m of cutting out tool form is R=L/2. Cranks are provided with counterweights installed on their extensions for equalizing inertia forces at rotation of plates. Cutting out tool form is secured on upper plate. Device has also cardboard tape driving unit with pushing out and take out pairs of rolls, radius R, m. The last of these pairs is provided with knives for cutting the tape with cutouts for separate sheets. EFFECT: increased capacity, enhanced operation reliability of foldable carton manufacturing device. 3 dwg

Description

 The invention relates to packaging machinery, and specifically to the industry that produces card bundles and boxes for packaging industrial and food products.

 It is known that for the manufacture of a pack or box of cardboard, it is necessary to carve out its reamer and draw a fold line. This operation is performed by punching on special presses using special molds.

 Punching mold 1 (Fig. 1), which has cutting knives corresponding to the configuration of the reamer, is fixed on the upper plate 2 of the press. Cardboard 3 is fixed on the bottom plate 4. Carving reamers are carried out by bringing the plates 2 and 4 closer together by penetrating the sharp edges of the knives into the workpiece material until they come in contact with the plate 4 (1).

 Crucible punch presses are best known. In them, the manufacture of a reamer with the application of fold lines is performed simultaneously along the entire contour. The moving plate of the press in most cases performs reciprocating motion.

Such presses have the following disadvantages:
- during the process of punching the reamer, the cardboard blank is stationary, therefore, the operation of feeding the sheet into the die-cutting zone and its output require labor time;
- only processing of sheet cardboard material is possible;
- reciprocating movement of the plate causes inertial loads;
- punch presses have low productivity due to the reverse movement of the moving plate.

 The closest analogue of the proposed invention is a device for the manufacture of reamers made of cardboard (2), in which the cutting is carried out during the movement of the cardboard tape between two plates with a die-cutting form, making an oncoming coordinated rotational-parallel movement. In this case, at the moment of maximum rapprochement of the plates, when the linear speeds of the plates, die and cardboard tape are equal in direction and magnitude, a sweep is cut.

However, in the specified technical solution, the following disadvantages are not eliminated:
- during rotational-parallel movement, massive plates create large inertial loads, which can cause breakdown of the device parts, are the cause of a decrease in its operational speed and uneven cutting out of the sweep contour and formation of bend lines;
- the device has not resolved the issue of output of carved sweeps.

 The basis of the invention is the task of creating a new productive, reliable in operation device for the manufacture of sweep.

 The task is carried out due to the proposed device for the manufacture of reamers of cardboard packaging, including a die cutting unit, consisting of moving plates mounted on cranks, forming together full-rotary articulated four-link, performing rotational-parallel movement symmetrically with respect to the workpiece material, die cut form, fixed on the top plate, and a tape guide assembly of cardboard, including pushing and output pairs of rollers, and according to the invention cranks they have a radius R, m associated with a long die-cutting form L, m with the ratio R = L / 2π, while the cranks have counterweights installed on their extensions to balance the inertia forces from the rotation of the plates, and the pushing and output pairs of rollers have a radius R, m, and the last of them is equipped with knives for cutting tapes with carved reamers into separate sheets.

 Thus, the technical result is ensured by balancing the inertia forces from the rotation of the plates and completing the output pair of rollers with a transverse cutting unit of the tape with carved reamers into separate sheets.

 A device for the manufacture of cardboard reamers consists of a form I (Fig. 2) and smooth 2 plates that are pivotally mounted on the cranks 3, 4, 5 and 6, while the cranks 3, 4 are placed mirror-like relative to the cranks 5, 6; punching form 7 (radius R, m cranks connected with a length L, m punching form with the ratio R = L / 2π, based on the condition of the need for supplying a cardboard tape with a length L = 2πR for one revolution and matching linear speeds of the punching mold and tape at the moment carving reamers), gears 8, 9, counterweights 10 - 13 mounted on the extensions of cranks 3 - 6 of the tape drive unit, consisting of rollers 14 - 17 (rollers having a radius of R, m are equal to the radius of the cranks and provide the necessary feed for one revolution lengths Arton tape and outputting carved scans) cardboard ribbon 18 which is unwound from a roll, knife 19 and counter knife 20 for cutting cardboard ribbon scans carved into separate sheets.

 The device operates as follows.

 The synchronous movement of the upper 1 and lower 2 plates is carried out using gears 8, 9, because of which the upper cranks 5, 6 rotate clockwise, and the lower 3, 4 counterclockwise. A die-cutting mold 7 is attached to the upper plate. Cardboard tape 18 is continuously fed by pushing rollers 14, 15 into the die-cutting zone. At the time of convergence of plates 1 and 2, the direction and magnitude of their linear velocity coincides and is equal to the speed of movement of the cardboard tape 18.

 The balancing of the inertia forces from the rotation of the plates is carried out using counterweights 10 - 13 mounted on the extensions of cranks 3 - 6.

 Cardboard die cutting begins at the moment the cranks are positioned at an angle α to the vertical line connecting the axes of the cranks 3-6 (Fig. 3), and ends at the moment of the closest approach of the plates 1, 2 (the cranks in this position are straightened along the vertical line). The rotation of the cranks to the next angle α is accompanied by the exit of the working sections of the knives from the cardboard material.

 The angle α is determined by the thickness of the cardboard from which the scan is made, and, as calculations have shown, for the most common types of cardboard is less than 1.5% of the total crank revolution.

Literature:
1. Germanies E. The reference book of the technologist-polygraphist.- M .: Book, 1982.

 2. US patent N 3686987, B 31 B 1/16, 1972.

Claims (1)

 A device for the manufacture of reamers of cardboard packaging, including a die cutting unit, consisting of moving plates mounted on cranks, forming together full-rotary hinged four-link units, performing rotationally parallel movement symmetrically with respect to the workpiece material, die-cutting form fixed on the top plate, and a tape-guiding cardboard unit, including push-in and lead-out pairs of rollers, characterized in that the cranks have a radius R (m) associated with the length of the die-cutting form L (m), respectively solution R = L / 2π, while the cranks have counterweights installed on their extensions to balance the inertia forces from the rotation of the plates, the pushing and output pairs of rollers have a radius R, and the last of them is equipped with knives for cutting a tape with carved reamers into separate sheets.

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