JPH0284521A - Absorber of yarn tension difference in sizing and drying machine - Google Patents

Abstract

PURPOSE:To prevent trouble of warp owing to yarn tension difference even at local and abrupt generation of yarn tension difference by rotationally driving other driving roll or drying cylinder existing within tension controlling interval through friction transmitting means. CONSTITUTION:Rotation of driving motor M is transmitted through continuous speed changers 9a, 9b and 9c and stretches of warps W are controlled in drying warp W conveyed from sizing box S passing through cylinder rows A and B in cylinder drying. A friction transmitting mechanism is installed on other driving roll means or drying cylinder means corresponding to the position having possibility of generation of abrupt heat-shrinkage of the warp W in the path controlling said stretch and rotation of shaft of roll, etc., is followed to the direction of generation of large tension, thus the tension difference is canceled.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a yarn tensioning and absorbing device in a sizing dryer, in particular, a device for drying a large number of sized warp yarns while being conveyed by a drive roll and a drying cylinder. When a large difference in thread tension occurs locally due to heat shrinkage or other causes while the sizing dryer is in operation, the load applied to the drive roll or drying cylinder at that location is used to skillfully balance the tension. This relates to a high-performance sizing dryer that eliminates local yarn tension differences, and becomes effective when the machine is switched to low-speed operation due to reasons such as repairing yarn breaks.

[Prior art and technical problems to be solved] A sizing dryer that dries while conveying a large number of sizing warp threads by contact with a sizing liquid in a size box is well known. In the sizing dryer, the warp threads are transported by contact with a plurality of rotationally driven drying cylinders, are gradually dried, and are wound onto a winding beam.

By the way, the temperature of the heating cylinder is set based on the contact time with the thread during normal operation (high speed rotation), so if the machine is brought down to low speed operation, for example when repairing thread breakage, etc. In some cases, the contact time between the yarn and the heating cylinder is long (which causes the yarn to dry rapidly in that area).Then, the yarn rapidly shrinks due to heat in that area (with a dryness level of 60 to 90). %), as a result of the sudden increase in yarn tension, the warp threads may slimp on the cylinder surface, causing fluff to occur on the threads and deteriorating the quality of the threads, or, if the threads do not slip, the warp threads may be pulled by the drying cylinder. When the sprocket is separated, only the heating cylinder rotates extra, and in a chain drive, the sprocket jumps over the chain (sprocket idling), which causes damage to the drive unit.

The present invention was developed to solve the above-mentioned problems in conventional sizing dryers.During the operation of sizing dryers, localized sudden differences in thread tension occur due to heat shrinkage and other causes. The technical problem is to provide a high-performance sizing dryer that can immediately resolve the local yarn tension difference and continue operating smoothly without causing any damage to the warp yarns, even when be.

[Means adopted to solve the problem]

The means adopted by the present inventor to solve the above technical problem are as follows.

That is, the present invention is based on a conventionally well-known sizing dryer that dries a large number of warp threads with glue while being transported by a drive roll and a drying cylinder, and the present invention is based on the premise that a large number of warp threads with glue are dried while being transported by drive rolls and drying cylinders. The warp stretch in the section is controlled by arranging either a drive roll or a drying cylinder on each side, and driving the drive rolls or drying cylinders so that the circumferential speeds of rotation of the drive rolls or drying cylinders become a predetermined ratio. In addition to the means, the other drive rolls or drying cylinders present in the section are driven to rotate through the friction transmission means.1. A yarn tension difference absorbing device for a sizing dryer that can eliminate the tension difference by causing the drive roll or drying cylinder to follow the direction in which the large tension occurs when a sudden yarn tension difference occurs between the front and rear ends. This was achieved.

〔Example〕

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. Note that FIG. 1 is a mechanical explanatory diagram showing an outline of an embodiment of the apparatus according to the present invention, and FIG. 2 is a partially enlarged sectional view showing a friction transmission mechanism employed in the drying cylinder of the embodiment of the apparatus.

As shown in the drawing, the warp yarn W, in which a large number of yarns are arranged in a sheet-like manner, passes through a size box S, passes through a cylinder drying section H, is dried, and is wound onto a winding beam Y.

In the size box S, a squeeze roll l and a sizing roll 2 are disposed facing each other, and the warp yarns W guided by the guide rolls 3, 4, and 5 are sent to the squeeze roll 1 and the sizing roll 2. Glued while being pressed, /! The cylinder is transported in a moist state and reaches the cylinder drying section H.

The cylinder drying section H includes two cylinder rows A-B, and the upstream cylinder row A includes four drying cylinders 6,
・6t・6. 64, and the cylinder row B on the downstream side includes drying cylinders 6S, 6.・67・6. It consists of The warp yarns W conveyed from the size box S enter the cylinder row A of the upstream train.

That is, the warp yarns W that have entered the cylinder row A of the upstream train go around from the bottom to the top of the drying cylinder 61 located on the downstream side in the lower stage, and go under the cylinder 62 located in the lower stage and on the upstream side. Enter and turn around to the top,
Furthermore, it goes around from the bottom to the top of the drying cylinder 6 located on the downstream side in the upper stage, enters the drying cylinder 64 on the upstream side in the upper stage, and then turns back to the upper side and guide roller G.
leading to.

The warp threads W in contact with the guide roller G1 are changed direction there and enter the cylinder row of the downstream train. That is, the warp threads W guided by the guide roller G1 go around to the bottom of the drying cylinder 6 located on the upstream side in the lower stage, and around the upstream side surface of the drying cylinder 6 located on the upstream side in the upper stage. , goes around the lower side of the lower downstream drying cylinder 6, goes around the upper side of the upper drying cylinder 66, turns back downward, and reaches the guide roller Gt arranged at a low position.

This guide roller G! At this point, the alignment yarn W is changed in its course in the horizontal direction, and is wound onto the winding beam Y via the nip roll 7a, the dividing bar 8, and the nip roll 7b.

One of the features of the present invention is that during the process of conveying the pasted warp threads, either drive rolls or drying cylinders are arranged on both sides of a certain section, and This embodiment adopts a means for controlling the stretching of the warp yarns W in this section by setting the mutual rotational speed ratio of the rolls or drying cylinders to an appropriate value, and in this embodiment, the driving motor M
The rotation of the sizing roll 2, the cylinder rows A and B, and the two-piece rolls 7a and 7b are provided with stepless speed changers 9a, 9b, and 9C in the transmission path to perform predetermined stretch control. be.

The most important feature of the present invention is that sudden heat is applied to the warp yarns W in the path of transmitting a predetermined rotation from the drive motor M to the various driving roll means or drying cylinder means and controlling stretching. A rotation transmission means called a friction transmission mechanism is adopted for the other drive roll means or drying cylinder means corresponding to the points where shrinkage may occur,
When a local rapid thermal contraction occurs in the aligned yarn W and a yarn tension difference occurs, the tension difference can be resolved by appropriately following the rotation of the axis in the direction where the large tension occurred. Exists.

First, in the first embodiment of the present invention, the drying cylinders 6, 6 rotated by the chain transmission device C7
．． - A friction transmission mechanism as shown in Fig. 2 is adopted for the rotation axis R-R-H of 64. That is, when the drive cylinder 6t is operated at low speed for repairing thread breakage, etc.
・6.・This is because heat shrinkage is most likely to occur in the 64 part.

In the friction transmission mechanism shown in Fig. 2, the drying cylinder (6, ,
A sprocket wheel 10 is mounted on the rotating shaft R of the rotating shaft R of the linings 11 and 11 in a state in which it is pressed by a spring 12, and the load exceeds a predetermined value (greater than the pressing force of the spring 12). is added to the drying cylinder, the sprocket foil 10 is connected to the lining 11
・At 11, friction will occur.

In the figure, reference numeral 13 indicates an adjustment nut for adjusting the squeezing force of the spring 12, and reference numeral 14 indicates a bearing device.

Of course, the pressing force of the spring 12 is set to such an extent that at least the drying cylinder does not slip during acceleration and deceleration of the pasting dryer.

The chain transmission device C1 that rotationally drives the cylinder row A of the upstream train includes an input (sprocket) wheel 15, and this input wheel 15 is connected to the stepless speed changer 9b to control the driving motor M under a predetermined ratio. The chain transmission device C2, which rotationally drives the cylinder row B of the downstream train, includes an input (sprocket wheel 16), and this input wheel 16 also has the above-mentioned It is connected to the stepless speed changer 9b to distribute and transmit the rotational force of the driving motor M to the chain transmission device C2 at a predetermined ratio.

In the above embodiment, an example was shown in which the friction transmission mechanism is applied to the shaft of the drying cylinder, but the invention is not limited to this.
By adopting a friction transmission mechanism as shown in Fig. 2 on at least one of the rotating shafts (not shown) of the 516, a sudden difference in tension was generated in the alignment thread W between the cylinder rows A and B of the upstream and downstream trains. Sometimes this can be absorbed.

The configuration of the device of this embodiment is generally as described above, but the present invention is by no means limited to the device of the above embodiment.
[Various modifications are possible within the scope of claim J, and in particular, the friction transmission means that is the most distinctive feature of the present invention may be adopted for all drying cylinders, and of course, in this case,
By driving the sizing roll 2 and nip roll 7a, which are drive rolls provided upstream and downstream of the drying cylinder row, at a predetermined rotational speed ratio, a predetermined trench control is performed in that section.

Furthermore, the apparatus of this embodiment can also be applied to a pasting dryer that is equipped with a hot air dryer upstream of a drying cylinder as a drying section. At this time, during low-speed operation, rapid thermal contraction of the warp yarns W is expected in the hot air drying product section, so the drying cylinder downstream of this is used as a friction transmission mechanism, and further includes a hot air dryer and the same dryer. Stretch control may be performed on both sides.

[Operation of the embodiment device]

Taking the above-mentioned first embodiment device as an example, its operation will be explained as follows.

First, when sizing drying is performed normally in the apparatus of this embodiment, the machine operates in high-speed operation mode, and the warp threads W are gradually dried as they pass through the cylinder rows A-B. At this time, the warp yarns in the section where the rotational speed of the drive roll or drying cylinder is regulated are conveyed while the tension is controlled by a preset amount of stretch, and are wound onto the winding beam Y.

When repair is necessary due to thread breakage, etc., the machine is switched to low-speed mode for repair, and the glued and moist warp threads W are sent to the drying cylinders 6□, 6.・Drying progresses rapidly when passing through the 64th part, leading to rapid thermal contraction and an extreme increase in tension. And drying cylinder 6t and 6. When a tension difference of more than a predetermined value occurs in the warp threads W spanning the warp threads, the friction transmission mechanism causes the drive cylinder to be pulled in the direction of the larger tension and rotate, thereby eliminating the tension difference on both sides.

As a result, a predetermined tension of the warp yarns W is secured through predetermined stretch control at least in the sections of the drying cylinder 6 Transport and winding is performed while uniformizing the tension.

[Effects of the present invention]

As explained above with reference to the embodiments, according to the sizing dryer constructed by applying the present invention, by conveying the warp yarns in a certain section with a preset stretch amount, the tension of the entire warp yarns in that section can be increased. In addition to maintaining the tension at a predetermined value, the sudden tension difference that occurs locally at any time in that section can be dispersed and conveyed to smoothly wind it onto the take-up beam, resulting in good warp sizing with high reliability. Drying treatment is possible.

[Brief explanation of the drawing]

FIG. 1 is a mechanical explanatory diagram showing an outline of an apparatus according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view showing a friction transmission mechanism employed in a drying cylinder of the apparatus of this embodiment. - Squeeze roll, 2 - Sizing roll, 3, 4, 5 - Guide roll, 6 ++s ++ - Drying cylinder, 7a, 7b - Nip roll, 8 - Division bar 9a, 9
b・9c・-Stepless speed changer, (10・11
．． 12, 13) - Friction transmission mechanism, 10 - Sprocket wheel, 11 - Lining, +2 - Spring, 13 -
-rJ Yukuzensetsu Natsuto 15/16---Hito Kaho Iru. A.--Cylinder row (of the upstream train), B.--Cylinder row (of the downstream train), C,, C,--Chain transmission device, G1.--Guide roller, H.--Cylinder drying section, M--driving motor, R--rotating shaft, S--size box, W--aligned thread.

Claims (3)

[Claims] (1) In a sizing dryer that dries a large number of sized warp yarns while being conveyed by a drive roll and a drying cylinder, a drive roll or a The warp stretch in the section is controlled by arranging any one of the drying cylinders and driving the rotation circumferential speeds of the driving rolls or the drying cylinders at a predetermined ratio. The other driving roll or drying cylinder is rotationally driven through a friction transmission means, so that when a sudden difference in yarn tension occurs before and after the driving roll or drying cylinder rotated by friction transmission, the driving roll or drying cylinder A yarn tension difference absorbing device for a sizing dryer, characterized in that the tension difference is eliminated by causing a cylinder to follow the direction in which a large tension is generated. (2) The yarn tension difference absorbing device for a sizing dryer according to claim 1, wherein the stretch adjustment between the rotating shafts of the target drive roll or drying cylinder is performed by a stepless speed changer. (3) The yarn tension difference absorbing device for a sizing dryer according to claim 1 or 2, wherein all of the rotating shafts of the drying cylinder are rotationally driven by friction transmission means.