SU754782A1 - Apparatus for cutting polymeric strip material - Google Patents

Description

The invention relates to a device for cutting a strip of polymeric material and can be used for cutting cord or steel cord fabric when preparing parts for tires of pneumatic tires.

A device is known for cutting behind “preparations from a strip of polymeric material, containing a frame with a moving carriage mounted on it in guides, carrying a cutting tool, mounted on a carriage turning in the plane of the cut, mounted on the carriage, turn hinges, spring-loaded lock position of the carriage relative to the frame.

The disadvantage of the known device is a complex structure, due to the need for funds to rotate the bracket and limit the rotation of the latter.

This disadvantage is eliminated in another known device for cutting a strip of polymeric material containing a frame, on which are fixed guides with grooves having trapezoidal sections, a carriage moving along the latter, a carrying double-edged knife, and clamps fixed on guides [2].

When cutting a material with a known device, the knife penetrates below the supporting surface of the table on which the material being cut is placed. Therefore, the use of the known device is not possible if placed on the supporting surface of the table under the material of a flexible element intended for feeding cut off blanks to the device for their use, since during the cut a flexible element will also be cut.

This disadvantage reduces the operational capabilities of the device.

The aim of the invention is to expand the operational capabilities of the device.

To achieve this goal, in a device for cutting a strip of polymeric material containing a frame on which guides are fixed with grooves having trapezoidal sections, a carriage moving along the latter, carrying a double-edged knife, and fixed on the guides clamps, the carriage is equipped with rollers installed in the grooves, and the cutting edges of the knife are made different in length, and ^(the ratio of their lengths is selected within 3: 4.

Figure 1 shows the described device; figure 2 - carriage with <

cutting element in the initial position ’, in FIG. 3 - section A-A in FIG. 2 ·; FIG. 4 - a carriage with a cutting element in the plunging position '; in Fig. 5 - a carriage with a cutting element 5 in the cutting position.

A device for cutting a strip of polymeric material contains a frame 1, hinged on a rack 2 by means of an axis 3, and when 10 water 4 rotates frame 1 in a vertical plane. Guides 5. with longitudinal grooves 6 with trapezoidal sections 7 are fixed on frame -1. In slots 6, movable carriage 9 movable by chain 10 is mounted on rollers 8 8. Chain 10 bends around sprockets 11 and is driven by drives 12 and 13 a double-edged knife 14 with cutting edges 2θ 15 and 16 and the blunted edge D7. Cutting edges 15 and 16 are different in length, and the ratio of their lengths is selected within 3: 4. On the guides 5 25, the clamps are fixed .18, and below them is the table 19.

- The device works as follows

in a way. In the initial position, the frame 1 is raised above the table 19, and the rollers 8 __ carriage 9 are in the slots 6 of the guides 5 at the place of their trapezoidal sections 7.

Polymeric material 20 is laid on table 19. Then frame 1 is turned by drive 4 around 35 axis 3 until the web 20 is fixed by clamps 18. At this time, knife 14 is pressed against material surface with blunt edge 17 at a specified distance from material edge, and 40 rollers 8 of carriage 9 go into the trapezoidal sections 7 of the slots 8 (see ftsg.2 and 3).

The actuator 12 is turned on, and the carriage 9 is moved by the chain 10 to the side,

45, in which the knife 14 is turned by a short cutting edge 15, i.e. to the left.

Because the 'knife 14 is pressed against the surface of the material 20, blunt edge 17, and cutting edge 15 of the knife is shortened, there is ^e moment of forces causing the knife 14 to unfold in the cutting plane with the carriage and crash into the material 20. In this case, the rollers 8 roll on the carriage the surface of the trapezoidal sections 7 of the grooves 6, which prevents the knife 14 from cutting into the supporting surface of the table 19 (see Fig. 4).

Upon further movement of the slide 9 to the left, the rollers 8 pass from

the trapezoidal sections 7 to the straight sections of the grooves 6. The blunted edge 17 of the knife 14 moves parallel to the table supporting surface 65 19, and the cutting edge 15 of the cutting knife 3

754782

four

The material in the zone of contact with it is its upper part. .

At the end of the stroke of the carriage 9, the knife cuts the material to the edge, but does not exceed its limits, after which the carriage 9. Moves in the opposite direction and the material is cut to the second edge by the second cutting edge 16.

After completion of the stroke, the carriage 9 returns to its original position, the frame 4 rotates the frame 1 in a vertical plane, and the material is released from the clamp. After the material is fed to the specified length, the cycle is repeated.

The proposed device can be used both separately (only for cutting material) and in conjunction with devices for applying material to the assembly drum. Combining the device for cutting with the device for applying material to the assembly drum leads to a reduction in the overall dimensions of the machines in which these devices change. In addition, the design of the table on which the material is cut is simplified, since there is no need to make a groove for the passage of tools on its top

1 5 ta.

20 I am I

Fig 3

S 15 14 P

Fairy 4

754782

Ευε У

Claims (2)

A DEVICE FOR CUTTING A STRIP POLYMER MATERIAL containing a frame on which guides with trapezoidal sections. rollers installed in the grooves, and the cutting edges of the knife are made different in length, and the ratio of their lengths is selected within 3: 4. but £ "Xp / 754782 one 754782 2