SU1148730A1 - Rear stop of shears for cutting sheet material - Google Patents

Abstract

1. BACK STOP OF SCISSES FOR CUTTING THE SHEET MATERIAL mounted on a frame and containing guides with sliders placed on them with the possibility of movement, levers, one ends hinged on the sliders, and a thrust beam connected to the other ends of the levers, t and in order to expand technological capabilities, the thrust beam is connected to the arms pivotally and installed with the possibility of a plane-parallel re-installation in a plane parallel to the plane of the arrangement of the guides, and fixing on the sliders. 2. An emphasis according to claim 1, characterized in that about the si of the articulated connections of the levers with the slider are perpendicular to the plane (O or the guides).

Description

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The invention relates to the field of metal forming, in particular, stops for measuring the length of sheet blanks cut by crank shears.

The closest to the invention according to the technical essence and the achieved result is the back stop of the shears for cutting sheet material, mounted on the frame and containing guides with the sliders placed on them with 6RM. The arms., .0 DNI-I-1 are hinged and slider, and thrust beam connected to the other ends of the arms

In the known stop, the longitudinal directions, as a rule, are fixedly mounted on the scissors frame, while the cantilever arms connect with the sliders pivotally and additionally perform the function of the arms pivoting in the vertical plane, providing the support of the stop beam with the code hanging down over it during cutting short knife bar blanks. To ensure synchronism of movement of both beams, as well as to return the thrust beam to its original position and hold it, such an emphasis is additionally supplied with a system of levers with springs or counterweights. The length of the guides of the known emphasis does not exceed the longitudinal size of the scissors bed, therefore it does not increase the length of the scissors production area and has an acceptable metal consumption, which is its advantage l.

However, with the existing sizes of beds of known types of crank sheet shears, the working length of the guides of such an emphasis, i.e. the stroke of the adjusting movement of the sliders with a thrust beam is no more than 1 m. This range of adjustment of the length of the blanks does not meet the requirements of modern technology, operating with sheet blanks up to 3 m long and more, which reduces technological capabilities.

The aim of the invention is the expansion of technological capabilities.

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This goal is achieved by the fact that in the back rest of the shears for cutting sheet material mounted on the frame and containing guides with sliders placed on them with the possibility of movement, levers, one ends hinged on the sliders, and a support beam connected to the other ends of the levers, stop beam Connected to the arms pivotally and installed with the possibility of plane-parallel re-installation in a flat, parallel to the plane of the location of the rails, and fixing relative to the sliders.

The axes of the articulated joints of the arms with the slide are perpendicular to the plane of the guides.

FIG. 1 shows the rear stop, side view with a longitudinal section in a vertical plane that coincides. with one of the levers, in FIG. 2 the same, top view.

The abutment consists of longitudinal guides 1, rigidly interconnected between front 2 and rear 3 by cross-beams, hinged respectively on movable knife beam 4 and frame 5 of crank shears.

. On the guides 1 are mounted the sliders 6 fitted with a rack and pinion drive 7 and 8 for kx

adjustment movement within the working length P of the guides, the value of which is equal to half of the specified maximum dimension D of the cut blanks. The slider 6 is connected by means of the levers 9 with the support beam 10, which is installed in the working position 1.

The connection of the levers 9 with sliders 6 and thrust beam 10 is made

using hinges 11 and 12 respectively. The axes of these hinges are mutually parallel and set perpendicular to the plane of the guides, as a result of which the levers

  the thrust beam 10 forms a four-mobile in the horizontal plane relative to its base unit of the fixed sliders 6.

In the specified working position 1 of the support beam 10, this chetyrehtomnik is fixed with the help of pins 13, inserted into coaxial holes,

with which the adjacent ends of the levers 9 and the support beam 10 are provided, thereby eliminating the mobility of the hinges 12 and the entire four-member. The adjacent ends of the beam 10 are additionally provided with holes 14, identical to those mentioned and placed diametrically opposite to them relative to the axes of the hinges 12. Due to this, the holes 14 can coincide with the holes in the levers 9 when the adjacent ends are turned by 180.

Uyor works as follows.

- When the stop is in operation, the working position 1 of the support beam 10 is used to cut workpieces no longer than half of their largest dimension D, which is ensured by an appropriate constructional value of the adjustment movement I 1 / 2D, carried out in the described embodiment manually using a rack and pinion gear 7 and 8 with flywheels 15.

If it is necessary to cut workpieces with a length of more than half D, the thrust beam 10 is set to the working position IT, (Figs. 1 and 2). To do this, the pins 13 are temporarily removed from the holes in the flanges of the levers 9 and by manually turning the levers by 180 °, the plane-parallel transfer of the support beam to position II is carried out. FIG. 2 shows one of the intermediate positions of the stop beam in the TaKONf translation (position III) and the trajectory of movement of the centers of its articulated joints 12 with levers 9 (dash-dotted lines - ARC circle

148730 4

With this, the inclined shape of the levers 9 allows for their unobstructed circular movement in a plane parallel to the 1 spaced position of the guides under the sliders 6, and their kinematic length K 1 / 4D, made with machine-building accuracy, provides the required size of the pitch shift: Ø 2K 1 / 2D while maintaining the parallelism of the stop beam of the cutting line in both its working positions.

In position II, the pin 13 is re-installed in the holes in the flanges of the levers 9, which now coincide with the holes 14 of the support beam.

In this position, the thrust beam is located at a distance from the cutting line equal to half of the largest size of the cut blanks at the initial position of the sliders (Figs. 1 and 2); therefore, with their subsequent adjustment movement, the greatest distance is thrust

25 beams from the cutting line is equal to the sum of the initial distance W 1 / 2D and the course of the adjustment movement I 1 / 2D, i.e. given the largest size D than and

30, it is preserved in the proposed stop with a half of the working length of the guides. The reverse translation of the stop beam to position I is carried out

- similarly.

Due to the horizontal movement of the stop beam in the process of its rearrangement, the ease of rotation of the levers and the convenience of a manual quick change of its positions compared with the known invention are provided.

Claims (2)

1. REAR STOP OF SCISSORS FOR CUTTING SHEET MATERIAL, mounted on a bed and containing guides with crawlers placed on them with the possibility of movement, levers pivotally mounted at the ends with one ends, and a thrust beam connected to other ends of the levers, distinguishing with that, in order to expand technological capabilities, the thrust beam is pivotally connected to the levers and installed with the possibility of in relative polzushek. 2. An emphasis according to claim 1, characterized in that the axial joints of the levers with the spider are perpendicular to the plane of the guides. SU. „> 1148730 Figure 1 1 1148730