SU524532A3 - Device for cross cutting of paper web - Google Patents

Description

This invention relates to the paper industry.

Devices for transverse cutting of a paper web are known, comprising cutting elements, for example knives, mounted on a rotating carrier, and a support drum, which feeds a continuous paper web, which supplies cutting.

When constructing such a device, it is very difficult to create accurate Mesq contacting with an electric wind and a supporting drum and uniform pressure of the knives along the entire length of the supporting surface of the drum carrying the hammer, which degrades the quality of cutting the web.

A similar device is also known, which comprises a rotary drum with knives and a support for Arabs, which has slots around the circumference, each of which has a support element and a liner connected to the main body, the latter representing a housing in which the rubber roller is provided element. The RUBBER roller does not have n & stiffness, it does not allow for sufficient and even pressure of the knife on the moving paper web for cross-cutting.

The cutting quality of the proposed cutting edge is connected with the liner by an axis located in the liner of the perpendicular radial plane of the drum and mounted on it with the option of swinging in radially shyustnost & Rabash1.

To limit the swing limit, the insert has two pins located higher and symmetrically relative to the axis of the support element, and in the latter there are holes for accommodating pins located in the holes with a gap; the drum with knives is installed on the uphols, the length of which is longer than the diameter, as a result of which this system may slightly bend in order to absorb the movement of the knives with respect to the input at the time of the sawing at a certain pressure.

W FIG. 1 depicts the predictable device view; in fig. 2 is the same, side view, in FIG. 3 cross-sectional view of insertion of a support element

The device contains a drum 1 mounted on trunnions 2, 3 of which are larger than their diameter, which allows them to be slightly bent under pressure at the time of cutting.

Claims (3)

Along the periphery of the drum 1, the grooves 4 (naprnmer six) are made, each being equally spaced one to another parallel to the axles of axles 2 and 3. In each groove 4 there is inserted a knife 5 of quafat section maintained by 6 n 7. Pins ends 2 n 3 are mounted in 8 n 9 bearings by the help of 10 n 11 thrust bearings. Bar & w 1 is rotated through one of the trunnions, for example papf 3, so that the drum rotates at a given speed. The drum I with the knives S is mounted above the supporting drum 12, having grooves 13 circumferentially. In each groove there is an insert 14, bearing an axis 15 n two pins 16 n 17, located imbued and symmetrically relative to 15 (see F. ) support element 18, which interacts at certain moments with knives 5 when the drum 1 rotates. Support element 18 is seated on axis 15 and re-molded on it with the possibility of swinging in the radial plane of the drum. In the support element 18, there are holes in which the pins 16 and 17 of the liner are placed, the pins entering the holes with a gap that allows the support element to rotate on the axis 15 within certain limits. The drum 12 sits on the drive shaft 19 to drive the drum in rotation. During operation, continuous paper web 20 (see Fig. 2) is fed to the supporting drum 12 by a feed mechanism 21, which has a slightly lower peripheral speed than the drum 12, which creates the necessary tension on the paper web 20. The speeds of rotation of the drums 1 and 12 and the feed mechanism 21 is synchronized to the finished cutting of the paper web 20 into certain lengths. The paper web is held on the drum 12 by sucking it through holes made on the circumference of the drum (not shown by Bjbi). When the sheet of the necessary bush is cut from the web, the web progresses at the peripheral speed of the drum. As a result, a time interval is created in a month by successive cut sheets of web. Depending on the thickness of the paper, the os1 | "knives are adjusted to the variable radius OA (see Fig. 1), but always somewhat larger than the distance from the surface of the drum 12 to create the necessary pressure to cut the paper. This is a small difference between the distances between the axles and the op amps and the opacities are compensated by beating paph 2 and 3. If the axles of the drums 1 and 12 are strictly parallel, then the support element 18 begins to rotate around the axis 15 so that the outer surface of the support element is strictly parallel to the tip of the knife 5 that will provide accurate cutting of the paper web 20. Claim 1. A device for transverse cutting of a paper web containing a drum with knives installed with possible rotation and a supporting & raban with circumferential grooves in each of which orny zlementy Zain and communication with it the insert, characterized in that, for the purpose povsh1eni cut quality, the reference zlementy bonded to the liner by an axis situated in the insert perpendicular to the drum radial plane and mounted thereon to swing in radnalnoy drum plane, 2. The device according to claim 1, characterized in that the insert has two pins located above and (symmetrically relative to the axis of the supporting element, and in the supporting element there are holes for accommodating pins located in them with a gap. 3. The device according to claim 1, characterized in that the drum with the blades is mounted on trunnions whose length is greater than the diameter.