JP3139030B2 - Fiber bundle cutting method and lap forming machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wrap former for forming a cutting method and <br/> wrap of the fiber bundle, in a spinning machine such as a sliver lap machine and the ribbon lap machine, the present cutting
The present invention relates to an apparatus for performing a method , winding a spun wrap fleece around a wrap bobbin, and cutting the wrap fleece.

[0002]

2. Description of the Related Art When the number of wraps supplied in a spinning machine using the wrap shown as a fiber bundle , for example, a comber, a ribbon wrap machine, etc., is reduced, the machine is stopped and the wrap fleece is cut manually or automatically, and Emitted outside the machine. Then, the leading edge of the supplied wrap fleece is overlapped and connected to the rear end of the wrap fleece in use. In this lap splicing, both the rear end of the wrap fleece in use and the front end of the wrap fleece of the full wrap bobbin are at least twice the fiber length (about 10 cm).
A fleece having a constant thickness is manually peeled off in the thickness direction depending on the drafting ability of the spinning machine, the kind of the raw material, and the like over a length of (about 20 cm), and the peeled-off part is polymerized.

[0003]

The work of peeling the wrap fleece thinly is inefficient, and the lap fleece overlapping section does not cause fleece breakage and requires a high degree of skill for the operator to strengthen the spliced section. As a result, individual differences tended to occur, and it was not possible to eliminate unevenness in the polymerized portion. For this reason, the thickness of the fleece superimposed part is not uniform, and the spinning machine using the wrap becomes a draft spot and the fleece breaks or
Problems such as trumpet clogging have occurred.

Some automatic lap splicers have been proposed. However, in a lap forming machine in the preceding process, when a full lap is formed, a continuous lap fleece is pulled out and cut. Pulled out part (about twice the fiber length)
If the comrades are polymerized in a spinning machine using a wrap, the thickness does not fluctuate, but since the polymerization length is short, the strength of the polymerized portion is not sufficient, and there is a possibility that the fleece may break. Other fibers
Drafting devices for cutting slivers, for example slivers
After placing the two calendar rollers,
The circumference of the calendar roller downstream of the fiber delivery direction
Set the speed between the calendar rollers to be higher than that on the upstream side.
Is known (Japanese Patent Publication No. 31-4765).
No., Japanese Patent Publication No. 32-2520, etc.)
The point that the bar is pulled out with the speed difference of the calendar roller as it is
As in this application, form a thin part in the fiber bundle before cutting.
It is different from what it produces. The challenge of this application is certain
A method that can extract and cut fiber bundles into
The method of that implemented the lap as the fiber bundle, and the
To provide a lap former that can eliminate each disadvantage
You.

[0005]

In order to solve the above problems, the present invention provides a method of drawing a fiber bundle drafted in a draft section.
A tension cutting method, wherein the cutting is performed prior to cutting.
The draft ratio of the main draft part of the draft
Draft the fiber bundle at the standard draft ratio
Make a thinner part than the part
So that it is pulled and cut when it is sent out from the
(Claim 1). Further, the lap forming machine of the present invention has a detector for detecting a wrap fleece winding length on a wrap bobbin, and a draft ratio change start set in advance near the end of winding based on a signal from the detector. A draft ratio control device that outputs a draft ratio change command that causes the draft ratio to be higher than the reference draft ratio for a certain length from a point, and a draft ratio change that changes the draft ratio of the draft portion according to the draft ratio change command. And a stop command device for stopping the intermediate portion of the wrap fleece portion having the fixed length draft changed at the cutting position.

[0006]

[Action] In the method of the present invention, the draft has been used at the standard draft ratio until then.
The draft of the main draft part is
A thinner part in the fiber bundle by increasing the
The part is pulled and cut at the position coming out of the draft part.

Further, in the lap molding machine of the present invention, the draft
Wrap fleece spun from the front and back
Winding wrap is formed on an empty wrap bobbin on the nip drum
In the draft ratio control device, the detected wrap winding length is
When the winding is near the end, a draft ratio change command is issued.
Output, and the output is output through the draft ratio changing device.
Raft the draft ratio of the draft
Thin the fleece for a certain length. When the middle of the thin fleece portion having a certain length has advanced to the cutting position between the nip roller and the back lap drum, the machine is stopped by the command signal of the stop command device, and only the lap drum is rotated by the first control motor in this state. Then, the wrap fleece is cut through in the middle of the wrap fleece that has been drafted for a certain length and thinned.

[0008]

An embodiment of the present invention will be described with reference to the drawings. A sliver wrapping machine (lap forming machine) that implements the present invention includes a wrap winding section 2, a draft section 3, and a sliver supply section 4, as shown in FIG.

The wrap winding section 2 includes a pair of wrap drums 5,
The rotation of the main motor 7 is transmitted to the front lap drum 5 and the back lap drum 6 via the lap drum single rotation device 8. The lap drum single rotation device 8 includes a first differential gear 9 and its transmission shaft 1.
The first control motor 10 is connected to the first control motor 2. The first differential gear 9 rotates the output shaft 1 by combining the rotation from the main motor 7 and the rotation of the first control motor 10.
1 can be output. At the time of normal draft, the first control motor 10 is stopped and the rotation from the main motor 7 is transmitted to the output shaft 11 without being synthesized, and the front lap drum 5 is rotated at a constant speed based on the gear train of the first differential gear 9. It is designed to rotate by number. The first differential gear 9 is driven by only the first control motor in a state where the main motor 7 is stopped, as described later, so that the lap drums 5, 6
Are driven independently. The draft part 3 is a roller part 16 on the spinning side of calender rollers (nip rollers) 20 and 21 and front rollers 22 and 23 from the front in the traveling direction of the lap fleece 15 (in the direction of the arrow in FIG. 1), and second rollers 24 and 25 behind them. And a supply roller unit 17 having third rollers 26 and 27 and back rollers 28 and 29.

The spinning roller 16 and the feed roller 17
A main draft section 18 for drafting the sliver 19 supplied from the sliver supply section 4 is provided. The front roller 22 and the calendar roller 20 of the spinning roller unit 16 are connected to the main motor 7 via an appropriate transmission system, and rotate at a constant rotational speed determined by the transmission system. The second roller 24 of the supply roller 17
The third roller 26 is driven at a constant speed from a back roller 28 via a gear train, and the rotation of the main motor 7 is transmitted to the back roller 28 via a draft ratio changing device 30. ing.

The draft ratio changing device 30 includes a second differential gear 3.
1 and a second control motor 33 connected to the transmission shaft 32. The second differential gear 31 can output to an output shaft 34 that combines the rotation from the main motor 7 and the rotation of a second control motor 33 whose rotation speed is variable with the voltage value. At the time of the normal draft, the second control motor 33 is stopped, and the rotation from the main motor 7 is directly transmitted to the output shaft 34 without being synthesized, and the back roller 28 is fixed at a constant speed based on the gear train of the second differential gear 31. It is designed to rotate at the rotation speed. Then, with the second control motor 33 stopped, the second differential gear 31 and the number of gears in the transmission gear train are set so that the main draft portion 18 has a predetermined reference draft ratio.
The pulley diameter is set.

A sliver supply device 4 is provided with a sliver can (not shown in FIG.
Main use), and a lifting roller 35 for supplying the sliver 19 contained in the can to the draft unit 3,
The rotation of the back roller 28 is transmitted to the lifting roller 35 via an appropriate transmission system.

The pulse generator 40 generates a pulse signal for measuring the winding length of the wrap 38 wound by the wrap winding section 2 by the rotation of the front wrap drum 5. The draft ratio control device 13 includes a first counter 41, a second counter 42, and a control unit 43. The first counter 41 counts the pulse signal from the pulse generator 40 from the beginning of the winding and finishes the winding from the beginning of the winding (the full wrap length L2 is obtained by adding the winding length L and the overlap length 11 described later in the embodiment. When a count value K corresponding to the winding length L up to the draft ratio change start point A set near (length) is reached, the count is incremented, and the signal is sent to the control unit 43.

Upon receiving the count-up signal from the first counter 41, the control unit 43 receives a second counter 42, which will be described later.
Until is counted up (for example, a portion B of a fixed length L1 from the reference draft ratio change start point A), a predetermined voltage value (draft ratio change command) E1 for driving the second control motor (servo motor) 33 is output. It is. When the second control motor 33 is rotated at the voltage value E1, the rotation of the second control motor 33 and the rotation of the main motor 7 are combined, and the draft ratio of the main draft portion 18 is set to the reference draft ratio. Is set to a value such that the rotation of the output shaft 34 of the second differential gear 31 becomes half of the normal rotation.

The second counter 42 counts pulse signals from the count-up of the first counter 41, and sets a set value K1 corresponding to the length L1 of the lap fleece portion B for changing the draft ratio. And the second counter 4
When the count value of 2 reaches the set value K1, the count is incremented, the signal is sent to the control unit 43, the application of the voltage value E1 is released, and the draft ratio of the main draft unit 18 is returned to the original reference draft ratio. ing.

The stop command device 44 comprises a third counter 45 and a control unit 46. The third counter 45 is the second
When the count-up signal of the counter 42 is input, the pulse signal from the pulse generator 40 is counted. The third counter 45 stops when the middle of the lap fleece portion B having changed the fixed length draft ratio reaches the cutting position C set at the center of the calendar rollers (nip rollers) 20 and 21 and the back lap drum 6 in advance. As described above, the set value K2 is set, and when the set value K2 is reached, a count-up signal is sent to the control unit 46. The control unit 46 outputs a stop command signal to the main motor 7 by the count-up signal of the third counter 45 and outputs a drive command to the first control motor 10 after the main motor 7 stops.

The operation of the device configured as described above will be described. In FIG. 1 and FIG. 2A, a plurality of slivers 19 supplied from the sliver supply unit 4 with the first and second control motors 10 and 30 stopped are drafted by the draft unit 3 at a reference draft ratio, and The wrap fleece 15 has a thickness. The wrap fleece 15 is wound around an empty wrap bobbin 39 placed on the front wrap drum 5 and the back wrap drum 6 of the wrap winding section 2.

A pulse generator 40 connected to the front lap drum 5 generates a pulse signal by rotation of the front lap drum 5 and sends the pulse signal to the first counter 41. The first counter 41 sends a count-up signal to the control unit 43 when the winding length from the start of winding reaches the winding length L at the start of draft ratio change. When receiving the count-up signal, the control unit 43 outputs a preset voltage value E1 to the second control motor 33 to drive and rotate the second control motor 33 at a predetermined rotation speed. When the second control motor 33 rotates, the second control motor 3
3 and the rotation from the main motor 7 are combined by the second differential gear 31, and the rotation of the supply-side roller unit 17 is reduced to half of the normal rotation, and the draft ratio of the main draft unit 18 is 2 times the reference draft ratio up to that time. Double. At the same time, when the second counter 42 starts counting the spinning length and reaches a length L1 at which the draft ratio is changed, a count-up signal is sent to the control unit 43, the driving of the second control motor 33 is stopped, and the draft ratio is returned to the original. .

In this way, a wrap fleece portion B having a doubled draft ratio, that is, a wrap fleece portion B having a reduced thickness by half, is obtained by a length L1 from the draft ratio change start point A (FIG. 2B). The count-up signal of the second counter 42 is also input to the third counter 45, and the third counter 45 starts counting the spinning length by this input. Third
The counter 45 indicates the overlap length l from the draft ratio change start point A.
A cutting point A1 separated by one is a cutting position C set at the center between the calendar rollers 20, 21 and the backlap drum 6.
, A count-up signal is sent to the control unit 46. When the control unit 46 receives the count-up signal, the main motor 7
Is stopped to maintain the stopped state, and the first control motor 10 is driven and rotated. And its rotation is the first differential gear 9
Only the wrap drums 5 and 6 are rotated through the, the wrap 38 placed is rotated in the winding direction, and the lap fleece is nipped by the calendar rollers 20 and 21, and the tension cutting point A1
Disconnect with

The wrap flap side portion at the cutting point A1 of the lap fleece portion B, which is reduced in thickness, becomes the wrap fleece tip when lap fleece splicing is performed in a later process. Is the polymerization length 11. The calender roller side portion has a length l2 required when the wrap fleece is wound around the empty wrap bobbin 39 for the first time after the doffing by the lap forming machine (1 to 2 turns).
And the total length of the wrap fleece overlap length 11. After the lap fleece is cut in the middle of the lap fleece portion B having a changed draft ratio, the rear end of the lap fleece is wound around the wrap 38.

When the full wrap bobbin becomes a small wrap bobbin in the spinning machine that succeeds the wrap in the post-process of the lap forming machine, the wrap fleece portion B having a half thickness is rewound. The length is cut so as to be the overlap length l1, and this portion is overlapped with the wrap fleece portion B (overlap length l)
By superimposing 1), as shown in FIG. 3, the thickness of the superposed portion D is made equal to the thickness before and after the superposed portion. The wrap fleece having a constant thickness in this manner does not cause draft spots, so that the fleece does not break. Also, since there is no work to peel off by hand, lap joining is easy. In this embodiment, the draft ratio is twice the reference draft ratio and the fleece thickness is halved. However, the fleece thickness is not limited to this. It may be a ratio.

[0022]

As described above , according to the method of the present invention, the fiber bundle
Prior to cutting off the main part of the draft section
Draft ratio of the draft part is higher than the standard draft ratio
As a ratio, a thin part is formed in the fiber bundle, and the thin part is formed.
After pulling the fiber bundle out of the draft section,
The fiber bundle is easily pulled out at the thin part and cuts securely.
can do. Further , according to the apparatus of the present invention, after changing the draft ratio to a fixed length near the end of the wrap fleece and a draft ratio higher than the reference draft ratio, and spinning, cutting is performed in the middle of the wrap fleece portion where the fixed length draft has been changed. As a result, a thin wrap fleece spun at a draft ratio higher than the reference draft ratio is formed at the beginning and end of winding on the wrap bobbin, and the beginning and end of the winding are performed in the next step (for example, a ribbon wrapping machine). At the time of performing the lap splicing. Therefore, it is not necessary to peel off a certain fleece by hand as in the prior art, and it is possible to reduce the variation in the thickness of the lap fleece overlapped portion by simply superimposing the fleece. In addition, the length of the lap fleece section and the length of the cut end of the lap fleece where the draft ratio is changed can be adjusted with the draft ratio control device. You can make a part.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the overall configuration of a lap molding machine of the present invention.

FIG. 2 is an explanatory view of an order for draft cutting a wrap fleece.

FIG. 3 is an explanatory diagram showing a lap fleece polymerization state.

[Explanation of symbols]

1 Sliver wrap machine, 2 Wrap take-up unit, 3
Draft section, 4 Sliver supply section, 5 Front lap drum, 6 Back wrap drum, 7 Main motor, 8 Single lap drum rotating device, 13 Draft ratio control device, 18 Main draft section, 20, 21 Calendar roller (nip roller) 30 Draft Ratio changing device, 38 laps, 40 pulse generator (detector), 44 stop command device

Continuation of the front page (56) References JP-A-53-16983 (JP, A) JP-A-49-118920 (JP, A) JP-B-45-18054 (JP, B1) JP-B-48-15217 (JP, A) , B1) JP-B 35-13722 (JP, B1) JP-B 37-10878 (JP, B1) JP-B 44-729 (JP, Y1) JP-B 38-818 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) D01G 25/00 D01H 9/16

Claims (2)

(57) [Claims] 1. A fiber bundle drafted in a draft section is drawn.
A tension cutting method, wherein the cutting is performed prior to cutting.
The draft ratio of the main draft part of the draft
Draft the fiber bundle at the standard draft ratio
Make a thinner part than the part
So that it is pulled and cut when it is sent out from the
A method for cutting a fiber bundle. 2. A lap forming machine that winds a wrap fleece spun from a draft portion for a predetermined length onto an empty lap bobbin placed on a pair of lap drums, and cuts the wrap fleece at a cutting position between a nip roller and a lap drum. A detector for detecting a wrap fleece winding length on the wrap bobbin;
Based on a signal from this detector, a draft ratio that outputs a draft ratio change command to make the draft ratio higher than the reference draft ratio for a certain length from a draft ratio change start point set in advance near the end of winding. A control device, a draft ratio changing device that changes a draft ratio of the draft portion by the draft ratio change command, and a stop command device that stops the middle of the wrap fleece portion that has been changed in the fixed length draft at the cutting position. Wrap forming machine.