JPH0630861Y2 - Web drafter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for drafting a laminated web manufactured by a card machine in a non-woven fabric manufacturing process to equalize the physical properties of the fibers. The present invention relates to a web drafter, and more particularly to a web drafter suitable for increasing the productivity of thin products.

[Prior Art] A conventional web drafter of this type is disclosed in JP-A-63-63.
Various techniques are known, such as the one disclosed in No. -152420. And, this type of web drafter is composed mainly of a plurality of sets of draft roller, and the web to be drafted is fed from above the feed apron and sequentially passed between the draft roller sets of each set to be drafted. It is designed to be sent out on the Berielpron.

By the way, the surface structure of the draft roller is uniform in all the draft rollers in any web drafter, and there are roughly two kinds of types, which are classified into a smooth type and a non-smooth type. It The former smooth one is generally one in which the entire cylindrical draft roller is formed of a metal material, or the outer periphery of which is covered with an elastic material such as rubber. Further, the latter non-smooth one is, for example, made of metal, and the surface of the draft roller is formed in an uneven surface shape having a groove group formed in parallel in the axial direction, or the outer circumference of the roller. There is a wire having a saw-toothed shape, a triangular shape, or a trapezoidal cross-section wound around it.

[Problems to be solved by the device]

In such a conventional web drafter in which the draft roller has a uniformly smooth surface structure or a non-smooth surface structure, the draft roller has a feed side through which the web is thickly stacked and a drafted thin state. There were the following functional defects in either the delivery side of the web.

In other words, with a draft roller with a smooth surface, the delivery side is drafty due to the smooth surface, and a thin web with a weak hugging force is surely gripped. With regard to (2), there is a problem with the smooth transition of the web because it has a poor bite on the web.

On the other hand, with a draft roller with a non-smooth surface, the feed side is excellent in the biting function for a thick web and the web transfer function, while the delivery side is a thin web that is drafted and has a weak hugging force. Since it is difficult to grip, fraudulent drafts are likely to occur. That is,
In this case, there is a problem that the thickness and weight of the drafted web become uneven, and the quality of the nonwoven fabric becomes unstable,
This problem becomes remarkable when a thick web is drafted at a high magnification.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a web drafter that ensures the transition of the web and prevents the generation of illegal drafts and realizes high quality and stable web production. To do.

[Means for Solving the Problems]

The web drafter according to the present invention is provided with a draft roller group composed of draft rollers having a non-smooth surface on the feed side, and a draft roller group having a smooth surface on the delivery side so that they are pressed against each other. It is characterized in that the draft roller set in 1 is provided.

[Action]

In this web drafter, since a rough and uneven draft roller is provided on the feed side, when feeding the web to be drafted from the feed apron, it is easy for the draft roller to bite into a thick web. , Transition the web smoothly to the delivery side.

Also, on the delivery side, since draft rollers that have smooth surfaces and are pressed against each other are provided, it is possible to reliably grasp and transfer a thin web with a weak embracing force, and to the delivery apron. It can be delivered reliably. In particular, even on a thin web, fraudulent drafts are less likely to occur, and migration can be performed reliably.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 3.

Draft station D for drafting web W
Before and after, a feed apron 3 for supplying a web W having a predetermined thickness to the draft station D is cross-laid by a cross-laying wrapper (not shown), and a draft apron sent from the draft station D. Delivery aprons 4 for supplying the web to the subsequent process are rotatably installed.

Draft station D has multiple sets (6 sets in this example)
Roller pair, that is, a pair of draft rollers (1a and 1b,
3 sets of 2a and 2b, each of which is hereinafter also simply referred to as a roller set) are provided, and each of them is composed of a top roller 1a, 2a and a bottom roller 1b, 2b (hereinafter also simply referred to as rollers) formed in a cylindrical shape. It constitutes one set.

The top roller 1a and the bottom roller 1b of the three draft roller sets on the feed side are all made of metal, and a metallic wire 5 formed in a sawtooth shape in a cross section is wound around the outer circumference thereof. Thus, the surface is not smooth, and the bite into the web is sufficient. The roller is fixed by fixing means (not shown) such as a screw member. On the other hand, the top roller 2a and the bottom roller 2b of the three draft roller groups on the delivery side are both made of metal and have a smooth surface.
They are arranged in a mutually pressurized state by means to be described later.

In addition, each of the roller sets, from the feed apron 3 side,
The top rollers 1a, 2a and the bottom rollers 1b, 2b of the odd-numbered roller groups have the same center height of the shaft portions 1c, 2c, respectively, and the top rollers 1 of the even-numbered roller groups are the same.
a, 2a and shaft portions 1c, 2c of the bottom rollers 1b, 2b
The heights of the centers of the rollers are the same, and the heights of the centers of the shaft portions 1c and 2c of the latter rollers are set to be higher than those of the former. That is, the nip point N of each roller set
Are arranged in a zigzag pattern in the vertical direction.

Further, the shaft portion 1 of the bottom rollers 1b and 2b of each roller set
c and 2c are rotatably supported at the lower portions of a pair of left and right roller stands 7 which are respectively provided upright on the left and right on the frame 6 and arranged in the traveling direction of the web W. The shaft portions 1c and 2c of the top rollers 1a and 2a of each roller set are respectively rotatably supported by bearings 8 which are slidable up and down with respect to the upper portion of the roller stand 7 and urged downward by a spring 9. While being supported, the top rollers 1a and 2a are respectively pressed toward the bottom rollers 1b and 2b, and the nip pressure of each roller group is screwed into the plate 7a at the upper end of the roller stand 7 and adjusted by the adjusting bolt 10. Is configured.

Further, although not shown in any of the drawings, on one side of the shaft portions 1c, 2c of the bottom rollers 1b, 2b of each of the roller groups, control motors individually shift-controllable by electronic control means such as inverter control are respectively coupled via couplings. And the bottom rollers 1b and 2b are engaged with gears fitted to the shaft portions of the top rollers 1a and 2a, and the bottom rollers 1b and 2b are rotated by the top rollers 1a and 2b.
Gear devices for transmitting to 2a are mounted respectively.

As described above, the web W supplied from above the feed apron 3 passes through the nip points N of the top rollers 1a and 2a and the bottom rollers 1b and 2b of each roller group in a zigzag manner in the vertical direction and passes through the rollers. It is configured such that the pieces are sequentially transferred as a group and sent to the delivery berlin apron 4.

Next, the operation and effect of this embodiment are as follows. That is, the web W supplied from above the feed apron 3 is
At the nip point N of the draft rollers 1a and 1b on the feed side which are not smooth, the metallic wire 5 on the surface thereof bites into the web W and is sequentially moved through the three roller groups. Therefore, the web W smoothly moves in a zigzag state with respect to the delivery side without slipping while being drafted.

Then, the web W having a smooth surface and moved to the draft rollers 2a and 2b which are in a pressed state with each other is evenly pressed at the nip point N thereof, so that the gripping force is increased and the fiber slips. Is reduced, and a smooth transition is made via three roller sets. Therefore, a thin web having a weak hugging force is securely grasped and transferred, and is fed onto the delivery berber 4 in a zigzag state. As a result, on the delivery side, it is possible to positively prevent an illegal draft from occurring even on a thin web, and to properly draft it.

From the above, a high quality and stable strength web can be obtained in which the drafted web has an even thickness and weight. Further, since each nip point N is arranged in a zigzag pattern in the vertical direction and the fiber layer advances in an arc shape along the surface of the roller before and after the nip point, the density of the web in the vicinity is increased, and the fiber mutual It also has the effect of increasing the hugging power.

It should be noted that the present invention is not limited to those shown in the above specific embodiments, and various modifications may be made within the scope of the present invention depending on the purpose and application. That is, in the above, a saw-shaped metallic wire was wound around the surface of the draft roller on the feed side, but the present invention is not limited to this, and the surface is not smooth, and the web biting and transfer functions A triangular or trapezoidal shape may be used as long as it has an excellent cross-sectional shape, or the surface of the draft roller is formed in an uneven surface shape having a groove group formed in parallel in the axial direction. But it's okay. Also, in the case of a plurality of roller sets, roller sets made of different materials may be combined, top rollers and bottom rollers may be different combinations, and various other combinations may be selected. Further, in the roller group on the feed side, the gap between the top roller and the bottom roller may be maintained at a predetermined amount without being pressed against each other.

Further, the draft roller on the delivery side may have a smooth surface so that even a thin web can be reliably gripped, and may be formed by covering the outer periphery with an elastic material such as rubber. Further, as described above, the entire surface of each roller is not limited to metal, and the entire surface may be covered with this elastic body. Alternatively, the top roller and the bottom roller may be alternately arranged every other two rollers, or may be arranged in any other combination.

Further, the number of roller sets, the feed side roller sets, and the delivery side roller sets is not particularly limited, and is not limited to a total of 6 sets and 3 sets as described above, and various selections can be made according to the draft ratio and the like. In general, the higher the draft rate, the larger the number of groups. For example, even if the total number of roller sets is 6, as described above, the number of roller sets on the feed side can be set to only the first set, the first and second sets, and the first to fifth sets.

[Effect of device]

In the web drafter of the present invention, as described in the above operation, the feed side is excellent in the biting function and the web transfer function, and the delivery side is also capable of sufficiently grasping a thin web with a weak hugging force and making it illegal. Draft can be prevented. Therefore, in this draft,
The thickness and weight of the drafted web are made uniform, and it becomes possible to manufacture a web of high quality and stable strength. In particular, this effect is remarkable when a thick web is drafted at a high magnification, and the productivity of thin products can be significantly increased.

[Brief description of drawings]

FIG. 1 is a schematic side view of a web drafter according to an embodiment, and FIG. 2 is an enlarged side view of essential parts of the drafter shown in FIG.
FIG. 3 is a partially omitted plan view of the drafter shown in FIG. 1; feed side draft roller, 2; delivery side draft roller, 1a, 2a; top roller, 1b, 2b; bottom roller, 3; feed apron, 4; delivery apron, 5; metallic wire, W; web.

Claims (1)

[Scope of utility model registration request] 1. A web drafter having a plurality of draft roller sets, wherein a draft roller set composed of a draft roller having a non-smooth surface is provided on the feed side, and a draft roller having a smooth surface is provided on the delivery side. A web drafter, characterized in that a set of draft rollers configured to be pressed against each other is disposed.