SU1759649A2 - Device for cross cutting of polymeric products - Google Patents

Abstract

Use: transverse cutting of polymer products with high reliability. SUMMARY OF THE INVENTION: The device is provided with a rotatable spring-loaded retainer mounted on the knife and for contact with the last finger. The double-shouldered pivot arm is provided with an additional arm rigidly connected to the arm to interact with the cam profile of the knife, which is mounted with the possibility of contact with a spring-loaded retainer. During operation, the knife is prevented from getting out of engagement with the product being cut. 6 Il.

Description

The invention relates to the field of plastics processing, in particular, to devices for the transverse cutting of polymer products, and is an improvement of the known device according to Aut. St. No. 1608065.

The known device for transverse cutting of polymeric products contains mounted on the body of the mandrel for the product of motorized rotation mounted on the spindle cutting head with a knife, a knife feed mechanism, the knife made in the form of a spring loaded two-arm freely rotatable, large shoulder which is equipped with a blade with an undercut and a cam profile, and the knife feed mechanism is made in the form of a two-armed lever to interact at one end with the cam profile of a knife, and the other end of the lever is connected to an electromagnet.

During long-term operation, the knife is blunted.

As a result, and also because of the possible differences in the thickness of the products, the knife can be displaced from its working position by the action of centrifugal forces and the spring holding it, and the blade will move away from the product being cut without cutting it to the end.

The purpose of the invention is to increase reliability.

This is achieved in that the device is equipped with a rotatable spring-loaded retainer mounted on the knife and for contact with the last finger, and a two-arm rotary lever is provided with an additional arm rigidly connected to the arm to interact with the cam profile of the knife, which is mounted with the possibility of contact with the spring-loaded retainer.

Figure 1 shows the proposed device, a General view; figure 2 - section aa in figure 1; on fig.Z-section BB in figure 1; figure 4 - node I in figure 2; in fig. - view In figure 4; figure 6 - node II in figure 1.

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The device includes a housing 1 with mandrels 2 and 3. A spindle 4 is mounted on the mandrel 2, holding the knife 6 mounted on the axle with a torsion spring 7. The spindle 4 receives rotation from a drive (not shown) mounted on the bearing 8.

In the lower part of the device is installed double-arm lever 9 connected to the electromagnet 10 and the spring 11.

The blade 12 of the knife 6 is made with the undercut 13. On the opposite side of the knife there is a cam profile 14.

On both sides of the knife 6, groups of clamps are placed, representing rollers 16 that are freely seated on the axes 15. Each group of clamps is located on a circle whose diameter is smaller than the smallest inner diameter of the mandrel (di).

One arm of the lever 9 is made double, comprising two parts 17 and 18. Part 17 is an extra shoulder. Rollers 20 and 21 are planted on both axes 17 and 18 on axis 19.

On the knife 6 there is a finger 22, on the side of which a retainer 23 is placed, seated on an axis 24, provided with cam profiles 25 and 26, in contact with the stop 27 and connected to the spring 28.

Mandrel 2 and 3 are pushed to the side and feed the product onto forked supports (not shown) placed coaxially with the mandrels and the mandrels 2 and 3 are assembled.

Since the diameter of the circle on which the clips are located is smaller than the smallest inner diameter of the mandrel, the rollers 16 are pressed into the product 29, fixing it reliably against rotation. The double-shouldered lever 9 is in the position shown by the dotted line (Figure 2).

The knife 6 is set in rotation, the electromagnet 10 is triggered, the lever 9 turns with its shoulder 18, the roller 21 presses the cam profile 14 of the knife

6, embedded in the body of the product 29. At the same time, the finger 22 presses the cam profile 25 of the retainer 23, overcoming the resistance of the spring 28 and is in the position shown in FIG.

Upon further rotation, the knife 6 comes out of contact with the lever 9, but does not return to its original position under the action of the spring 7 due to the fact that it rests against its undercut 13 on the wall of the product 29, and the finger 22 rests on the latch 23. The electromagnet 10 is turned off. Under the action of the spring 11, the lever 9 returns to its original position. The knife makes a full turn, cut the product 29 into two halves.

The latch 23, interacting with the cam profile 26 with the additional arm 17 of the lever 9, is brought out of contact with the finger 22 of the knife 6 and is returned to its original position by the action of the spring 28.

Dilute mandrels 21 and 3 and fork supports. The cut product falls into a container (not shown). The fork supports are folded, another product is delivered, and the cycle is repeated.

The device prevents the knife from getting out of engagement with the product being cut. This eliminates the risk of incomplete cutting of the product, increases the reliability of the device.

Claims (1)

Invention Formula Device for cross cutting polymer products according to ed. St. No. 1608065, in order to improve reliability, it is equipped with a rotatable spring-loaded retainer mounted on the knife and for contact with the last finger, and a two-shoulder rotary lever is provided with an arm rigidly connected to the arm for interacting with the cam profile of the knife an additional arm which is mounted with the possibility of contact with a spring-loaded lock. Yu Fig 2 15 Fig Vidv 5 FIG. 6