JPS5813287B2 - How to cut strips into strips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting strips into strips, and more particularly to a method for making multi-strip or very narrow slits possible with an automatic strip slitting device.

This type of slitter is illustrated in FIG.

That is, a plurality of slitter heads 2, 2 are provided on upper and lower stand rails 10, 10, which are provided perpendicularly to the strip conveying direction, so as to be slidable in the width direction of the strip, respectively. 1 is adapted to be raised and lowered by, for example, a screw mechanism.

This allows you to change the set position of the rotary blade 1 due to changes in the cutting width, number of cutting strips, thickness, etc. of the strip by adjusting the width direction and vertical movement of the head 2 and the rotary blade 1 without using a stand. It has the advantage of being easy to perform.

However, with this structure, the spacing between adjacent rotary blades 1, 1 cannot be made smaller than the width of the slitter head 2,
At the same time, since the slitter head 2 is equipped with a drive mechanism, a lifting mechanism, etc. together with the rotary blade 1, it has a considerably wide width, which has the disadvantage that it cannot slit extremely narrow or medium-sized strips.

The present invention provides a strip cutting method that takes advantage of the above-mentioned automatic width changing slitter and can also make extremely narrow slits if necessary. By providing stages and using these heads in appropriate combinations, it is possible to reduce the cutting width without being constrained by the head width, and at the same time, the multi-stage head can slit accurately on each slit planned line. The slitter heads at each stage, except for the last stage head, cut the strip in half without separating it, and the slit parts that are still connected after leaving these slitter heads are cut by the pair of rolls. The feature is that it can be separated by pressing between the two.

A detailed explanation will be given below with reference to the drawings.

FIG. 2 is a schematic diagram showing a side view of a cutting line for carrying out the method of the present invention, in which the strip 4 unwound by the uncoiler 5 and sent out reaches the slitter stand 3 via an esroll or the like.

The slitter stand has a plurality of upper and lower pairs of slitter heads 2 arranged in parallel in the width direction of the strip, and a plurality of stages 21...
. . . 2n are provided, and each head 2 is slidable in the width direction of the plate, and a rotary blade 1 provided in the head is provided so as to be movable up and down.

This slitter stand is set in advance so that one pair of the rotary blades 1 of the head correspond to the planned cutting line of the strip based on the specifications such as the slit width and the number of slits of the strip to be cut. However, at this time, the nG head 21...2
n are used in combination each time.

In other words, for example, the five sets of slitter heads 2 shown in FIG. 1 are arranged in two stages, the number of slits is 8, therefore the number of slits is 7, and the width of the slits includes one that cuts at d, which is narrower than the width of the head. An example will be explained below.

Among the seven cutting lines A and B planned for the strip plate on the lines shown in Figure 3, first, the intervals wider than the head width (dX
2) With respect to line A, the four heads of the first stage are used as shown by the solid line in FIG. 1, and the second stage can be arranged independently of the first stage. Three suitable heads 2 are used to correspond to the remaining B line as shown by the chain lines in the figure.

The unused head is retracted vertically as shown at the left end of FIG. 1 so as not to come into contact with the strip to be slit.

By using a combination of multiple stage heads as described above, it is possible to meet the demand for various narrow width slits.

When cutting a strip into strips using upper and lower cutting blades installed at several stages in the strip's advancing direction, for example, A' and B in FIG.
If the slit is made at point A', if it is cut in the usual way at point A', the part between A and A will shift in the width direction when it reaches point B', resulting in the inconvenience of not being able to cut accurately. .

In order to solve this problem, in this method, at least the slitter heads up to the previous stage 2n--1 of the final stage, that is, the slitter head at point A' in the example of FIG. The depth of cut S of 1,1 was set to be less than the depth of cut during normal cutting and did not result in push cutting, and when slitting, the strip was not completely cut, as shown in Figure 5 A. The slit is made into a half-cut shape 8 having a step 9.

With this setting, the strip plate 4 fed into the slitter stand is not completely cut off and is fed in a connected state until at least just before the final stage head 2n of the slitter stand 3. The possibility of misalignment in the width direction at the cutting point is completely eliminated, and the same width accuracy as conventional single-stage cutting is ensured.

Regarding the final stage slitter head 2n, since there is no slitter head in the latter stage, there is no concern about positional deviation in the width direction during cutting, and therefore, complete cutting may be performed as usual, but due to the setup of the cutting work. Rather, it is preferable to use a method in which the connected plates are separated into strips by passing them through a press roll (described later) without cutting all the layers.

Next, as shown in FIG. 2, this strip plate 4' passes through three rolls and reaches just before the recoiler 6, where it is passed between a pair of press rolls 7, 7 provided here.

At this time, the step 9 of the half-cut portion shown in FIG. 5A is strongly pressed with plain rolls from above and below, and the connected half-cut portion 8 is completely separated as shown in the opening in the same figure.

The pair of plain press coals 7, 7 have a simple structure and an extremely reliable separating action, and are therefore recommended for use in the step of separating into strips in this method.

The strip 4'' thus divided into strips is immediately sent to a recoiler and wound into a plurality of strip coils.

As is clear from the above description, in the cutting method of the present invention, parallel slitter heads of automatic width changing slitters are provided in a plurality of stages in the conveying direction of the strip, and these are used in combination. It is possible to set the width to be extremely narrow if necessary.In addition, by dividing the cutting operation into two stages: half-cut slitting and the subsequent separation process, the accuracy of the cutting width can be maintained, and the cutting width and number of threads can be kept very small. etc., automatically without using another stand.
The advantage of being able to instantly change J can be maintained.

Furthermore, when all slitting is done in half, the strip plate after slitting can be handled as a single plate up to just before the recoiler, which brings about many effects, such as simplifying the cutting line configuration and work setup.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing a slitter used in the present invention, and also a front view showing an example of the arrangement of the slitter heads in the present invention, and FIG. 2 is a schematic diagram showing an example of a cutting line for carrying out the method of the present invention. 3 is an explanatory plan view showing the planned cutting line of the strip plate on the line corresponding to FIG. 1,
Fig. 4 is an enlarged view of the upper and lower pair of rotary blades equipped with the same slitter head, and Fig. 5 (a) shows the cross-sectional shape of the slit plate, where (a) shows the half-cut slit band plate and the half-cut part of the masticator. Each figure shows the separated state. In the figure, 1: rotary blade, 2: slitter head, 3: slitter stand, 4: band plate, 5: uncoiler, 6: recoiler, 7, 7: a pair of press rolls, 8: half-cut section.

Claims (1)

[Claims] 1 A plurality of slitter heads having parallel pairs of upper and lower rotary blades are provided in the direction of conveyance of the strip, and slitter heads other than the general slitter heads of the plurality of stages or the slitter heads other than the final stage are arranged along the slitting line of the strip. Slit into 8 halves with
A method for cutting a strip into thin strips, the method comprising: after leaving the slitter head, the strip is rolled up through a step of pressing between a pair of rolls to separate the half-cut portions.