FR2499111A1 - DEVICE FOR MOWING A BAND OF TEXTILE FIBER FABRIC - Google Patents

Abstract

THIS DEVICE FOR CUTTING A STRIP OF TEXTILE FIBER HAIR FABRIC 2 IS OF THE TYPE INCLUDING A CIRCULAR CUTTING BLADE 3 PLACED AHEAD OF A CUTTING TABLE 1. TO SHORTEN THE CUT AREA IN THE DIRECTION OF THE CUT AS AS POSSIBLE. ADVANCE OF THE FABRIC WITHOUT INCREASING THE WIDTH OF THE MACHINE, FOLLOWING THE INVENTION, SEVERAL MOWING WHEELS 3 ARE ARRANGED ONE NEXT TO THE OTHERS ON A CROSS LINE IN THE DIRECTION OF THE ADVANCE OF THE TISSUE BAND, ALSO WITH A MUTUAL GAP REDUCED AS POSSIBLE AVOIDING CONTACT WITH THE WHEELS.

Description

The invention relates to a device for mowing a strip of fabric to

  pile of textile fibers, device comprising a cutting table serving to support the strip of fabric in the mowing area, while a cutting blade arranged opposite the cutting table is produced in the form of a wheel circular mower with a cutting edge at its periphery, working without counter blade and driven

  rotating about an axis roughly perpendicular to

re to the fabric strip.

  A device of this kind is already known, from the patent application of the Federal Republic of Germany DE-AS 23 14 557. The mower wheel used in this construction has a larger diameter

  to the width of the fabric strip, measured transversely

  in the direction of scrolling. The periphery of the mower wheel can be made in the form of a single smooth cutting ring. Whereas in traditional mowing machines which have a

  cutting cylinder and a lower counter blade, the

  cut berries are practically pulverized due to the

  number of mower propellers and rotational speed

  tion of the cutting cylinder, it should be possible with already known systems to cut the fibers without grinding them and to reuse them, for example as fillers or as additives in the manufacture of nonwoven products. However, the device according to patent application DE-AS 23 14 557 has not proved satisfactory, because the mowing occurs on an arc of a circle whose depth, measured in the direction of movement of the fabric, can almost reach half the diameter of the mower wheel. In the area of the cut, which is determined by this circular arc, the strip of fabric to be mowed should, for example, be stretched between two rollers, exactly parallel to the plane defined by the circular arc. Unfortunately, it is precisely this result that we fail to achieve in practice, among others

  because the mower wheel, which has a large over-

  face, produces a considerable draft which draws the strip of fabric to be mowed from its prescribed position in the mowing area. In the known device, the depth of the cutting area, measured in the direction of advance, which is determined by the active part of

  the arc of a circle, can only be reduced by increasing

  the diameter of the mower wheel. This badly implies

  fortunately as a consequence a lateral overflow of large segments of the mower wheel beyond the

working width of the machine.

  The object of the invention is to reduce

  at a minimum the dimension of the cutting area of the available

  sitive of the kind cited at the beginning in the direction of the advance

  without increasing the width of the machine. The solution ap-

  supported by the invention consists in the fact that several mower wheels are arranged one beside the other on a line which extends transversely to the direction of advance of the strip of fabric, facing the table

  cutting, with a mutual spacing as small as pos-

  sible just excluding mutual contact.

  Against all expectations, we arrive next

  the invention to be obtained using several mower wheels

  its arranged at a certain mutual spacing (restricted) a smooth mowing free of stripes. It was impossible to expect such a result because we could not predict how the hair fibers located in the area between two clippers or at the limit

  of two mower wheels would behave when toning

  you. Nor was it possible to overlap

  slightly expensive sharp because in this case we

  was sure there would be streaks in the over-

  mowed face. Finally, and for reasons easily

  understandable, the cutting edges of the mower wheels are

  sines should not touch each other.

  The mutual spacing (d) of the mower wheels

  should preferably correspond in order of magnitude, no-

  especially with a value of about 0.01 mm, the size of the elementary threads or elementary fibers of the hair to be cut. Furthermore, it may be advantageous for the diameter of the mower wheels, in particular with a value

  of the order of magnitude of 100 mm, i.e. a small comparative-

  the width of the strip of fabric to be mowed. Other features and benefits of

  the invention will appear during the description which

  go follow. In the accompanying drawings, given only in part

be an example

  - Fig.l shows a cutting device

  according to the invention by a cut parallel to the direction

  the advance of the fabric strip; - Fig.2 is a top view of the wheels

  clippers and the strip of fabric, taken at right angles

  the plane of the fabric strip.

  The textile fiber fabric strip 2 is

  guided on the cutting table, which is formed in particular

  link by a drum 1 and with which cooperate more

  rotary circular blades or mower wheels 3.

  By adjusting the distance between the mower wheels 3 and the

  cutting table or drum 1, you can determine with a-

  advances the length to which the fibers 9 of the fabric strip 2 are to be cut. As indicated in Fig. 2, the mower wheels 3 can all rotate in opposite directions, which are indicated by arrows. In this way, we obtain a perfect cut, even for fibers and threads which are on the line defined by

  the slot formed between two adjacent mower wheels 3.

  In principle, the arrangement of the mowing wheels or cutting blades can be horizontal, as in the case

  represented, or vertical (or with any

  the tilt). In the embodiment considered,

  the mower wheels 3 which are to be rotated

  tion are mounted in a cutting beam 4 which is also associated with a suction device 5 and which further contains a bearing 6 and a drive 7

  for each of the mower wheels 3. Using the device

  Aspiration tube 5, which at least partially surrounds the cutting area, the cut fiber ends can be vacuumed and sent to an appropriate tank. At the same time, the fibers 9 located in the cutting zone can be straightened (and drawn against the cutting edge of the wheels) under the action of the air current prevailing in

  the suction device, which is indicated by an arrow.

  Since the section according to the invention

  occurs without a counter blade, the cutting edge of the mower wheels

  its 3 should be particularly sharp. It is therefore

  tageuse to combine with the mowing wheels 3 a sharpening device 8 which can move in the direction indicated by the arrow. In this way, the circular blades can

be sharpened on the spot.

  According to the invention, the cutting of the fibers using circular wheels or circular blades occurs in a relatively short cutting area, of which

  the length, measured in the direction of the indicated advance

  quée by an arrow, is at most equal to half the diameter D of the different circular wheels 3. If the diameter D is of the order of magnitude of 100 mm, the area

  therefore has a length of about 50 mm in the di-

  rection of the advance. With the device according to the invention

  tion, we can therefore directly use a table

  eg made in the form of a drum table, pointed

  or a hollow table. In the embodiment example

  flabbergasted, we have represented with the drum 1 a table of

drum type.

Claims (4)

- CLAIMS -   1.- Device for mowing a strip of pile fabric (9) of textile fibers (2), which comprises a cutting table (1) serving to support the strip of fabric in the mowing area, and in which a blade cutting arranged opposite the cutting table (1) is made in the form of a mower wheel (3)   circular with a smooth cutting edge provided at its peri   piercing, working without a counter blade and driven in rotation about an axis approximately perpendicular to the strip of fabric (2), characterized in that several circular mowing wheels (3) are arranged one beside the other opposite the cutting table (1) on a line which extends transversely to the direction   scrolling of the fabric strip (2), with a spreader   mutual benefit (d) as small as possible excluding any just mutual contact.   2.- Device according to claim 1, characterized in that the mutual spacing (d) of the mower wheels (3) corresponds in order of magnitude, in particular with a value of about 0.01 mm, to the size of the   elementary son of the hair (9) to be cut.   3.- Device according to one of the claims   cations 1 and 2, characterized in that the diameter (D) of the mower wheels (3), in particular with a value of the order of 100 mm, is small compared to the width of the strip of fabric (2) to be mowed.   4.- Device according to any one   of claims 1 to 3, characterized in that it uses   reads a suction device (5) used to evacuate the particles of fibers cut in the pile and, at the same time, to straighten the fibers of the pile (9) which it it's about cutting.