JPS6379734A - Method and apparatus for cutting strand - Google Patents

Abstract

PURPOSE:To improve workability in case of starting the feed of a strand to a feed roll by hanging the tip side of the strand to a guide lever and closely sticking it around the feed roll and winding the strand. CONSTITUTION:The tip side of a strand 1 is held and pulled in hand over hand and separated from a feed roll 20 and a guide roll 18. Then the switch of the feed roll 20 is turned on and after the feed roll 20 is started to be rotated, the strand 1 pulled till this time is passed through the guide roll 18. Successively after hanging it to a strand 32 from the upper part of the feed roll 20, it is pulled to the lower part of this side. Since the strand 1 is stuck with a binder content and has adhesive properties, it adheres around the circumferential surface of the feed roll 20. The strand 1 is gradually fed in the direction of cutter roll 22 so that it is folded from the midway thereof by the rotation of the roll 20. Finally it is engaged between the roll 20 and the cutter roll 22, the winding is completely finished, and simultaneously the cutting of the strand 1 is started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a strand cutting method and apparatus that improve workability when starting feeding the strand to a feed roll.

[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 filament 12 is pulled together to form a strand 1. After passing through guide rollers 16 and 18, A cutting method is known in which the strand is fed between a feed roll 20 and a cutter roll 22 rotating in contact with the feed roll 20 and cut into short pieces to form chopped strands 2 (for example, Japanese Patent Publication No. 52-44932). The reference numeral 24 is a presser roll.

In such a cutting method, the tip end of the strand 1 is fed between the feed roll 20 and the cutter roll 22 to start the cutting operation, but conventionally, a worker grasps the tip end of the strand 1. The strand 1 was wound around the feed roll 2o so that the tip of the strand 1 passed between the feed roll 20 and the presser roll 24 and was caught between the feed roll 20 and the cutter roll 22. Note that, after the strand 1 is wound around the feed roll 20, the strand 1 is continuously fed.

[Problems to be Solved by the Invention] However, during the winding of the strand 1 around the feed roll 20 as described above, the strand 1 tends to come off the feed roll 2o, and must be operated in such a way that it does not get caught between the rolls. This made the work extremely difficult and required skill.

[Means for Solving the Problems] The present invention provides a method in which the tip side of the strand is hung on a guide lever,
The strand is brought into close contact with the circumferential surface of the feed roll, and the strand is wound around the feed roll.

That is, the method of the present invention uses a strand cutting device equipped with a feed roll and a cutter roll disposed in contact with the peripheral surface of the feed roll, and when starting cutting of the strand by winding the tip end of the strand around the feed roll. A strand guide is provided close to the peripheral surface of the feed roll, the strand is hung on the strand guide, and the required tension is applied to the strand to bring the strand into close contact with the feed roll for winding. .

Furthermore, the apparatus of the present invention includes a feed roll and a cutter roll, which are arranged with their axes parallel to each other and rotated by a drive device, and the cutter roll is arranged in contact with the peripheral surface of the feed roll. In this strand cutting device, a strand guide for starting strand winding is provided close to the peripheral surface of the feed roll.

[Function] In the present invention, the feed roll is rotated and the strand is wound around the feed roll. With the tip end of the strand being hung on the strand guide, the strand is wrapped around the feed roll on the upstream side of the strand guide. The winding is carried out in close contact with the winding.

By employing the strand guide in this manner, the positioning of the strand becomes easy and reliable, the strand is prevented from coming off during winding work, and the strand winding work becomes easy and quick.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a plan view of a main part of the apparatus according to the embodiment, and FIG. 2 is a side view of the same.

In the device of this embodiment, the feed roll 20 is supported by a shaft 26 and can be driven to rotate in the direction of the arrow by a drive device (equipped with a motor and a speed reducer, shown in the figure) installed in a box 28. has been done. Reference numeral 30 is a safety cover for the cutter roll 22 and presser roll 24.

In this embodiment, the strand guide 32 is provided facing the circumferential surface at approximately the same level as the axis of the feed roll 22. In this embodiment, the strand guide 32 has its proximal end fixed to the box 28 and is oriented in the horizontal direction. A shaft portion 32a extending to
A lever portion 32b is provided extending from the tip side of the shaft portion 32a in a direction opposite to the feed roll 22. Note that this lever portion 32b is connected to the shaft portion 32.
b1. A gently sloped portion b2 larger than b3 is provided. Note that the shaft portion 32a has a surface roughened (for example, rough finished).

The rest of the structure is the same as that shown in FIG.

A method of winding a strand using this embodiment device will now be described with reference to FIGS. 4 to 6.

4 is a schematic side view, FIG. 5 is a view taken along the V arrow in FIG. 4, and FIG. 6 is a diagram showing changes over time.

First, grasp the tip of the strand 1 and pull it away from the feed roll 20 and guide roll 18.Next, turn on the switch of the feed roll 20, and after the feed roll 20 starts rotating, wait until then. The loose strand 1 is passed through the guide roller 1B, hooked onto the strand guide 32 from above the feed roll 20, and then pulled forward and downward. (See Figures 4, 5, and 6(a)).

Then, the strand 1 comes into close contact with the circumferential surface of the feed roll 20, but since the binder is attached to the strand 1 and it is sticky, it sticks to the circumferential surface of the feed roll 20. And feed roll 20
As shown in FIGS. 6(b) and 6(C), the strand 1 is folded back from the middle and is gradually sent out in the direction of the cutter roll 22, and finally the feed roll 20 and the cutter roll are separated as shown in FIG. 6(d). 22, winding is completed, and cutting of the strand 1 is started. Note that the tip portion 1a of the strand 1 is
When the grip is released, the feed roll 20 and cutter roll 2
It gets caught in 2. Moreover, if it is kept in the grip, it will be taken out of the apparatus without being bitten as an uncut piece.

Note that the work of gripping the tip end of the strand 1 may be performed by a worker, or may be performed by an automatic gripping mechanism equipped with an appropriate grip.

FIGS. 7(a) to (d) show that in the state of FIG. 6(a), the tip portion 1a of the strand 1 is placed first on the feed roll 20.
This is done when the cutter roll 22 becomes caught between the cutter roll 22 and the cutter roll 22.

That is, as shown in FIG. 7(a), when the grip on the strand tip 1 is released, the tip portion 1a is first caught between the feed roll 20 and the cutter roll 22, and cutting begins (see (a) in FIG. b7).Then, the succeeding strand 1 attached to the circumferential surface of the feed roll 20 is gradually sent out in the direction of the cutter roll 22 by being folded back from the middle of the strand 1 as shown in FIG. 6(C), and then, same(
As shown in d), the strand 1 is caught between the feed roll and the cutter roll, the winding is completed, and the strand 1 is cut.

A preferred embodiment of the strand guide employed in the present invention will be described next.

(2) The diameter is 3 to 10 mm, for example about 5 mm, and the material is preferably SUS, which has good corrosion resistance.

(2) If the distance W between the strand guide and the feed roll circumferential surface is within 2 to 3 mm, good winding can be achieved.

- The level difference between the strand guide and the center of the feed roll is preferably 0 or a slightly positive value (the strand guide is higher). When h becomes negative (the strand guide is downward), it becomes difficult to hang the strand on the strand guide. Also, if h becomes too large,
The strand contact length on the feed roll circumferential surface becomes shorter, making winding more likely to fail.

■ The lever part 32b of the strand guide has an inclination θ of 5.
From the viewpoint of workability, it is preferable to set the angle to 30°, for example, around 15°.

■ The lever part 32b of the strand guide is connected to the shaft part 3.
If it forms an obtuse angle with 2a, the strand will enter the back of the strand guide just by pulling the strand 1 over the lever portion 32b, making the work easier and advantageous in terms of safety.

■ In particular, if the lever part 32b is provided with a gently sloped part b2,
Strand 1 can be easily applied to the b2 part. And this b2
There is a part with a steep slope on the back side of the part, so
The strand 1 transitions into the shaft portion 32b very smoothly.

(2) If the strand guide 32 is roughened, the strand 1 will be easily transferred to the feed roll 22. That is, if the strand guide surface is roughened, the resistance that the strand receives at that portion increases. Therefore, the strand easily transfers to the feed roll side, which has higher adhesive strength. (By making the strand guide surface rough, the strands can all be transferred to the strand guide side in a few seconds, for example.) FIG. 8 shows a different embodiment, in which the strand guide 32 is moved around the feed roll 20. An embodiment is shown in which the cutter roll 22 is provided so as to be able to reciprocate toward and away from the cutter roll 22 along the surface.

In this embodiment, the strand guide 32 is first positioned above the feed roll 20 as shown in FIG. 8(a), and the strand 1 is hung on the strand guide 32 in this state.

Next, while pulling the strand 1, the strand guide 32 is rotated to a position on the side of the feed roll 22 as shown in FIG. 8(b). Then, the upstream side of the strand guide 32 of the strand 1 comes into close contact with the feed roll 22, so that the strand 1 is then wound around the feed roll 22 in the same manner as the procedure shown in FIG. 6.7.

In order to install the strand guide 32 so as to be able to reciprocate, for example, as shown in FIG. A strand guide 32 may be provided at the tip.

This arm 35 may be moved manually or may be driven by a power device. In the latter case, for example, a configuration as shown in FIG. 10 can be adopted.

Reference numeral 36 is an arm fixed to the sleeve 34, and has a long hole 36a. A pin 38a is slidably fitted into the elongated hole 36a, and the proximal end of the zero-rotation arm 38, which is protruded from the tip of the rotary arm 38, is connected to the shaft of the stepping motor 40. By rotating the motor 40, the arm 36 reciprocates, and the arm 35 reciprocates via the sleeve nib 34. Therefore, by rotating the motor 40 by half a turn, the strand guide 32 is moved from FIG. 8(a) to FIG. 8(b), and by further rotating it by half a turn! From a(b)(
The return motion to a) can be performed. Of course, the present invention can employ various other mechanical movement mechanisms as the drive mechanism for the strand guide 32.

11 to 13 show still further embodiments of the invention. In this embodiment, a strand guide that also serves as a safety cover is used. That is, the strand guide 42 includes a curved cover part 44 and a flat side cover part 46, and the upper side 44a of the curved cover part 44
functions as a strand guide,
A lever portion 48 is provided at the side end. This lever portion 48 has the same shape as the lever portion 32b and performs the same function.

The strand guide 42 is installed along the circumference of the feed roll 20 and over the cutter roll 22 and presser roll 24, as shown in FIG. 12.13. As shown in FIG. 13, this strand guide 42 winds the strand 1 around the feed roll 22 by hanging the strand 1 on the upper side 42a. Since the state is the same as that shown in FIG. 6, the explanation thereof will be omitted. (In addition, in the embodiment shown in FIGS. 11 to 13,
The strand guide 42 is fixedly installed, but the 8th to
It may be movable as in the embodiment shown in FIG. ) By using such a small cover-shaped strand guide 42, the winding work efficiency is improved and the safety of the working environment is further improved.

In addition, next, a suitable aspect of the strand guide 42 will be explained.

(2) It is preferable that the strand guide 42 is removable so as not to impede the replacement work of the feed roll, cutter roll and presser roll, and has a shape and structure so that the cover does not come into contact with each roll during cutting work.

- SUS material is suitable for the material of the strand guide 42 in order to prevent fluff, etc. caught in the gaps between each roll and the cover from sticking.

(2) In order to facilitate the removal of fly fluff caught in the gap between each roll and the cover, it is preferable that each cover part 44, 46 be a punching plate.

[Effects] As described above, according to the present invention, it becomes possible to wind the strand around the feed roll extremely easily and quickly, and the efficiency of the strand cutting operation is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the embodiment device, Fig. 2 is a side view of the same, and Fig. 3 is a plan view of the embodiment device.
The figure is a side view of a conventional device, each of FIGS. 4 to 7 is an explanatory diagram of the strand winding method, FIG. 8 is a schematic side view of a different embodiment of the device, and FIG. 9 is the same diagram. Part perspective view, 1st
0 is a configuration diagram of the strand guide drive mechanism, FIG. 11 is a perspective view of the strand guide 42, and FIGS. 12 and 13 are a plan view and a side view showing the state in which the strand guide is attached. 1... Strand, 10... Bushing, 2
0... Feed roll, 22... Cutter roll, 24... Presser roll, 32
．． 42...Strand guide. Figure 4 Figure 5 (a) (b) (c) (cl) Figure 7 (a) (!:+) (C) (!:l)
Figure 8 (a) (b) 1st floor

Claims (9)

[Claims] (1) Using a strand cutting device equipped with a feed roll and a cutter roll disposed in contact with the feed roll circumferential surface, when winding the tip end of the strand around the feed roll and starting cutting the strand, A strand guide is provided close to the surface, the strand is hung on the strand guide, and a required tension is applied to the strand to bring the strand into close contact with the circumferential surface of the feed roll, thereby winding the strand around the feed roll. Strand cutting method. (2) The strand guide is movable along the circumferential surface of the feed roll, and first, the strand guide is separated from the cutter roll, and the tip end of the strand is moved so that the strand is not in contact with the circumferential surface of the feed roll. The winding is performed by hanging the strand on the strand guide, then moving the strand guide toward the cutter roll approach side with the strand hanging, and bringing the strand upstream of the strand guide into close contact with the circumferential surface of the feed roll. Strand cutting method according to item 1. (3) are arranged with their axial directions parallel to each other, and
In a strand cutting device that includes a cutter roll and a feed roll rotated by a drive device, and the cutter roll is arranged in contact with the feed roll circumference, a strand is cut close to the feed roll circumference to start strand winding. A strand cutting device characterized by being provided with a guide. (4) The strand guide is approximately hook-shaped, and includes a shaft portion extending substantially parallel to the axial direction of the feed roll, and a lever portion extending from one end of the base in a direction away from the feed roll. A strand cutting device according to claim 3. (5) The lever portion extends in a diagonal direction forming an obtuse angle with the shaft portion, and a gently sloped portion is provided in the middle of the lever portion where the angle formed with the shaft portion is larger than other portions. A strand cutting device according to claim 4. (6) The strand cutting device according to claim 3, wherein the strand guide is roughened. (7) The strand cutting device according to claim 4 or 5, wherein the shaft portion is roughened. (8) The strand guide is provided in a small cover shape along the peripheral surface of the feed roll.
Strand cutting device as described in Section. (9) Any one of claims 3 to 8, wherein the strand guide is provided so as to be movable back and forth in the direction toward and away from the cutter roll along the circumferential surface of the feed roll. Strand cutting device as described in.