SU927504A1 - Device for cutting a bar of plastic material - Google Patents

Description

I

The invention relates to devices for cutting timber from a plastic material and can be used in the building materials industry, the ceramic industry, for example, in brick factories.

A device for cutting a clay bar is known, containing two traction organs in the form of endless chains carrying cutting strings across a moving material, in a plane angled to the movement of the bar 1.

The closest to the present invention is a rotary cutting machine for a belt press that includes two rotating discs in a plane parallel to the direction of movement of the beam with hinged levers carrying cutting strings and in contact with a cam made on the base 2.

A disadvantage of this device / is a large number of parts, which leads to a deterioration in the provision of a device with cutting accuracy.

The purpose of the invention is to improve the accuracy of cutting timber and simplify the design.

This goal is achieved by the fact that, in an apparatus for cutting a bar of plastic material coming out of a box-shaped press housing containing a frame, there are two rotating disks with hinged levers carrying cutting. the strings and those in contact with a copier made on the frame, the disks are fixed on the box-shaped case, the copier is made in the form of grooves, and the levers interact with the grooves with the ends carrying the cutting strings.

Figure 1 shows the device (device, side view; figure 2 - section along

39

A-A in Fig. 1; fig.Z cutting scheme.

The device consists of a box-shaped housing 1 with two semi-axes 2, on which two freely rotating disks with gear rims 3 "C beds with copy grooves 5, levers 6, cutting strings 7 of two gears 9 with drive shaft 10, Bed C semi-axes 2 are mounted. attached to the frame 4, Levers 6 with one ends hinged evenly around the discs 3 and the other ends, on which the cutting strings 7 are attached. They are included in the copy grooves 5.

Since the levers 6 are attached to the discs 3 from the outside, holes 8 are made for the passage of the strings 7 in the discs 8. The discs are driven by the gear 9 of the drive shaft 10.

The operation of the device is as follows.

The beam 11 that leaves the press enters the box-shaped body 1, on the semi-axes of which disks 3 driven by gears 9 of the drive shaft 10 (drive not shown) synchronously rotate. The direction of movement of the beam 11 and the rotation of the discs are shown by arrows in FIG.

On disks 3 circumferentially ABC (fig.i are pivotally attached levers 6 (HELL, BE and CQ). Ends of levers 6C, D, E) on which cutting strings 7 are fixed move in a copy groove 5, defining the law of string movement along a curve MKEPbN in such a way that the strings at the section of the straight cut cut products of double length, and at the section of the reverse cut they cut them.

The angles of inclination of the NM and CR sections are chosen in such a way as to ensure the perpendicularity of the cutting planes of the POLE and SE to the direction of movement of the beam, and the distances between these sections are chosen in such a way as to ensure that the cutting string moving in the section CR

the middle of a piece of timber cut off by the previous string as it moves along section NM.

The ratio of the speeds of movement and rotation of the disks corresponds to

Where v is the speed of the beam;

t1 is the number of strings;

C - the length of the product;

VW is the rotational speed of the disk. A device for cutting timber from plastic material ensures stabilization of the accuracy of cutting timber. This is achieved by the fact that the ends of the arms, on which the strings are mounted, enter the copy grooves that define the law of movement of the strings. It eliminates the need for side guides working in adverse conditions with a high coefficient of friction due to the tightening forces that occur at the time of cutting the bar.

Claims (2)

1. USSR author's certificate No. 292790, cl. B 28 B 11/14, 19b9. 2. USSR author's certificate No. 299368, cl. B 28 B 11/14, 1967.