JPS63222038A - Apparatus for cutting strand - Google Patents

Abstract

PURPOSE:To obtain the titled cutting apparatus giving chopped strands having uniform length and capable of forming a high-quality product with little unevenness of properties, by delivering a strand from a guide part and cutting the strand while keeping the strand in straightened state with blasting gas. CONSTITUTION:A strand 1 is guided to a guide part 44, introduced into a rotary region of a cutting blade 36 and cut with the blade 36 in the rotary region. In the above process, a gas stream is blasted at the guide part 44 along the feeding direction of the strand. Accordingly, the strand 1 delivered from the delivery end of the guide part 44 toward the rotary region is guided with the gas stream and introduced into the rotary region while preventing the bending and warpage of the strand. The variation of the cut length can be surely prevented by this process. The signs (2) and (46) in the figure represent chopped strand and stationary blade, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for cutting a strand of glass fiber or the like into chopped strands.

[Prior Art] For example, as shown in FIG. 3, a binder is applied to a filament 12 pulled out from a bushing 10 using a binder applicator 14, and the strand 1 is formed by aligning the filament 12, which is then passed through guide rollers 16 and 18 to a feed roll. 2
A cutting device is known in which the strand is fed between a cutter roll 22 which rotates in contact with the foot roll 20, and is cut into short pieces into chopped strands 2 (for example, Japanese Patent Publication No. 52-44932). In addition, the code|symbol 24 is a presser roll.

Furthermore, JP-A-61-197442 describes a device in which a cutting blade is attached to the front surface of the outer periphery of a wheel, and the strand is fed from the front side of the wheel toward the rotating area of the cutting blade while being guided by a cylindrical member. There is.

[Problems to be Solved by the Invention] As shown in FIG. 3, the method in which a cutter roll is rotated in contact with a feed roll and the strand is fed between these rolls for cutting has the following problems.

■ In order to change the cutting length, cutter rolls with different cutting blade spacings are required, and therefore it is necessary to prepare cutter rolls for each cutting length in advance, which increases the cost of the equipment configuration.

■ The cutter roll needs to be replaced every time the length of the strand is changed.

■ A large number of cutting blades must be installed in the cutter roll, and it takes time to install these blades.

■ Since the blade of the cutter roll is thick, it is not possible to cut the strand into a short cut length of, for example, 0.5 mm or less.

In addition, the chopped strands cut between the blades may become clogged, causing miscuts and making it impossible to continue cutting.

The method disclosed in Japanese Patent Application Laid-Open No. 61-197442, in which the strand is guided from the front side of the wheel by a cylindrical member and cut using the cutting force of the rotating blade, does not have the above-mentioned problems. The problem is that the cut strands are in a free state, causing deformation such as bending and warping, and resulting in variations in cut length.

[Means for Solving the Problems] The strand cutting device of the present invention includes a rotating body to which a cutting blade is attached and rotationally driven by a drive device, and a cutting blade rotation area of the rotating body that is disposed opposite to the rotating body. It is configured to include a guide section that guides the strand to be fed into the rotating region, and a gas passage that blows out an air flow in the strand feeding direction to the guide section.

[Operation] In the strand cutting device of the present invention, the strand is guided by the guide portion and fed into the rotating region of the cutting blade, and is cut by the cutting blade in the rotating region. Therefore, the airflow in the direction of feeding the strand is ejected into the guide part, so the strand sent out from the tip of the guy F part toward the rotating area is guided by the airflow,
It is fed into the rotating region while being prevented from bending or warping. Therefore, variations in cut length can be reliably prevented.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a main part of a strand cutting device according to an embodiment of the present invention. Reference numeral 30 is a cutter roll;
This shaft center portion 32 is pivotally supported by a bearing (not shown),
Further, it can be driven to rotate around the axis 32 by a drive device (not shown) with a transmission. A plurality of hammers 34 are attached to the shaft center 3 from the circumferential surface of the cutter roll 30.
A cutting blade 36 is fixed to the tip of the hammer 34 on the front side in the rotational direction (arrow A) of the cutter roll 30. Reference numeral 38 is a casing surrounding the cutter roll 30, and an opening 40 is provided above the cutter roll 30.
A block 42 is fixed to the upper surface side of 0. A long hole-shaped guide portion 44 for guiding the strand 1 is installed vertically through this block 42, and a tip end opening 44 of the guide portion 44 is provided on the lower surface of the block 42.
A fixed blade 46 is fixedly installed at the edge of a. The fixed blade 46 is installed such that the guide portion 44 is located on the side that receives the cutting blade 36. Further, the fixed blade 46 is installed just outside the rotation area of the cutting blade 36, and the strand 1 is cut by sandwiching the strand 1 between the fixed blade 46 and the cutting blade 36.

A gas passage 48 is bored in the block 42 . This gas passage 48 has an inlet 48a opened on the upper surface of the block 42, and a spout 48a on the inner wall surface of the middle part of the guide part 44.
8b is opened.

This gas passage 48 is provided so as to be inclined with respect to the axial direction of the guide portion 44 so that the direction of the gas ejected from the ejection port 48b is in the direction of the distal end opening 44a of the guide portion 44. Reference numeral 5o indicates an air introduction pipe connected to the introduction port 48a.

A strand guide 52 for guiding the strand 1, a feed roll 54, and a presser roll 56 are installed above the cutting device, and the feed roll 54 can be rotationally driven by a drive device (not shown) with a transmission. has been done. Further, the presser roll 56 is rotatable around its support shaft.

In the strand cutting device configured in this way, the strand 1 is guided by the strand guide 52 and cut into the guide portion 4 by the feed roll 54 and the presser roll 56.
Sent into 4. Further, the cutter roll 30 is rotated at a predetermined speed by a drive device. The strand 1 fed into the device through the guide 44 is cut between the cutting blade 36 and the fixed blade 46, resulting in chopped strand 2.
It is said that Therefore, a gas passage 48 is provided in the guide portion 44.
The air is being blown out, and the strand 1 sent out from the tip of the guide part 44 enters the tip opening 44 of the guide part 44.
Guided by the gas ejected from a, it maintains a straight posture without bending or warping, and is cut. Therefore, chopped strands 2 having the expected length can be obtained.

In this cutting device, the length of the chopped strand 2 can be changed by keeping the rotational speed of the cutter roll 3o constant and changing the feeding speed of the strand 1. The feeding speed of the strand 1 can be set to an arbitrary speed by changing the rotational speed of the feed roll 54.

Further, the length of the chopped strand 2 can also be changed by keeping the feeding speed of the strand 1 constant and changing the rotational speed of the cutter roll 30.

Furthermore, since chopped strands of a desired length can be hung while leaving the configuration of the cutter roll 3o as is, it is not necessary to prepare many types of cutter rolls. Furthermore, even when producing short chopped strands 2 of, for example, 0.5 mm or less,
Clogging of chopped strands between the blades is prevented, and stable production of chopped strands is possible.

Note that, for example, a hopper, a container, or the like is installed below the cutter roll 3° in the casing 38, and the chopped strands 2 can be received in this container or the like and carried out of the apparatus.

In the present invention, the material of the cutting blade is not particularly limited, but cemented carbide, ceramic, etc. are suitable. Furthermore, the number of cutting blades 36 and hammers 34 for supporting them is not particularly limited, but -
Since the rotational balance would be disrupted if there were only one, it is preferable to use a plurality of them and to install them at equal intervals in the circumferential direction.

Although only one cutter roll 30 is shown in the above-mentioned embodiment, for example, a plurality of cutter rolls 30 may be installed in parallel in the axial direction, and correspondingly, the guide portion 44 may be arranged on each cutter roll by the number of installed cutter rolls. 30, and a plurality of cutting portions may be provided in one device. Further, a plurality of guide portions may be provided for − number of cutter rolls, and a plurality of cutting portions may be provided for − number of cutter rolls.

FIG. 2 is a sectional view of a main part of another embodiment of the device, and shows a device in which air is blown from an air nozzle 51 through an opening 44b on the outer surface of the guide portion 44.

In this case, the gas passage is composed of a pipe 50 and an air nozzle 51.

The strand cutting device of the present invention can also be applied as a so-called wet cut (direct cut) type cutting device in which the filament pulled out from the bushing is aligned to form a chopped strand as shown in Fig. 3. It can also be applied to so-called dry cutting, in which the manufactured strand is wound around a -H bobbin and cut.

Further, the cutting device having the structure of the present invention can be applied not only to strands but also to cutting devices for pelletizing resin, for example.

In the device of the above embodiment, the axial direction of the cutter roll is horizontal and the strand 1 is fed from vertically above, but the axial direction of the cutter roll 30 may be set at other angles, and the strand is fed. It is clear that the direction may be non-vertical.

Further, in the above embodiment, the hammer 34 is made to protrude from the cutter roll 30, and the cutting blade 36 is attached to the tip of the hammer 34.
However, in the present invention, Japanese Patent Application Laid-open No. 61-197
The present invention is also applicable to a cutting device such as No. 442 in which a cutting blade is provided on the outer peripheral edge of the front surface of the wheel and the strand is fed and cut from the front side.

[Effects] As described above, according to the present invention, the length of the chopped strands becomes uniform because the strands sent out from the guide part are cut while maintaining a straight posture with gas.
It is possible to manufacture high-quality products with small variations. In particular, the present invention is suitable for producing short chopped strands.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a main part of an apparatus according to a different embodiment, and FIG. 3 is a schematic configuration diagram of a conventional apparatus. 1... Strand, 2... Chopped strand, 30... Cutter roll, 34... Hammer,
36... Cutting blade, 44... Guide part,
46... Fixed blade, 48... Gas passage. Agent: Patent Attorney Tsuyoshi Shigeno 2nd
Figure 3

Claims (3)

[Claims] (1) A rotating body equipped with a cutting blade and driven to rotate around its axis by a drive device, and a guide that is installed opposite to the cutting blade rotating area of the rotating body and guides the strand fed into the rotating area. A strand cutting device comprising: a section; and a gas passage that blows out an air flow in a strand feeding direction to the guide section. (2) A fixed blade is disposed close to a rotating region of the cutting blade, and the guide portion is installed on a side of the fixed blade that receives the cutting blade. Strand cutting device. (3) The guide portion is an elongated hole extending in the strand feeding direction, and the ejection port of the gas passage is opened in the inner wall in the middle of the elongated hole, and the gas passage ejects gas toward the tip of the elongated hole. The strand cutting device according to claim 1 or 2, wherein the strand cutting device is provided at an angle of .