JPS622203Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a yarn end defibration device in a pneumatic yarn splicing device, particularly a yarn end defibration device that defibrates the yarn end by applying an air flow to the yarn end within a nozzle hole. We have various types of yarn end defibration devices that apply appropriate airflow to yarns with different conditions such as fiber length, number of twists, and thickness, and by replacing these devices, we can provide good defibration for various yarns. It is an attempt to obtain a state.

When piecing the ends of spun yarn, both ends of the yarn are sucked into separate nozzle holes, and compressed air is blown through the nozzle holes in the nozzle holes to loosen the fibers that make up the ends. However, as mentioned above, conditions such as fiber length, number of twists, and thickness change depending on the type of yarn, so when changing the type of yarn, it is necessary to adjust the jetting amount and jetting angle. .

In reality, by rotating or moving the nozzle pipe fitted so that it can slide and rotate freely, the intersecting state of the jet hole drilled in the pipe and the compressed air guide hole drilled in the external part of the pipe is changed. I was doing it. However, the small rotation or movement of the pipe greatly changes the state of the jet flow, making it a very delicate adjustment.Therefore, in factories equipped with automatic winders equipped with pneumatic splicing devices, this is often the case when changing yarn in progress. This required a lot of time and effort. The purpose of this invention is to prepare yarn end defibrating devices for various types of threads in advance, and to save time and effort by simply replacing the yarn end defibrating device when changing the thread. This allows quick thread exchange.

Next, the embodiment will be described with reference to the drawings.

FIG. 2 is a front view of the pneumatic splicing device 1.
A yarn splicing member 2 is placed in the center, and the yarn splicing member 2
As shown in FIG. 1, the thread splicing hole 4 is connected to a slit 3 for passing the thread, and an air flow is ejected from a jet nozzle (not shown) to perform the splicing. The thread splicing member 2 is attached to the frame 6 via the front plate 5.
The front plate 5 is screwed onto the thread guide 7,
Yarn end control blocks 11 and 12 are embedded together with the frame 6. There are thread cutting devices 20 and 21 on both sides of the front plate 5, which are designed to cut the bobbin side YB and package side thread YP, respectively, and grooves 22a, 22b, 23a, and 23b for thread guides are provided at both ends. There are fork guides 22, 23 having the following. fork guide 2
A pair of thread shifting levers 25 and 26 which are simultaneously operated by a shaft 24 on both sides of the thread splicing member 2 are configured to pivot, and together with a thread presser lever 28 that pivots on both sides of the thread splicing member 2, the thread YBYP is moved into the thread splicing hole 4. It is guided inward and comes into contact with the stopper 27 and stops. The upper thread clamp device 30 clamps the thread YP between a turning lever 31 and a clamp plate 32, and the lower thread clamp device 33 clamps the thread YP between a lever 34 and a movable clamp plate 35.
Hold on to YB. Below the pneumatic yarn splicing device 1 is a yarn detection device 41 attached to a bracket 40.
There is a shaft 43 that inspects the defective part of the thread within the slit 42 and rotates with the thread detection device 41 in between.
A pair of supported switching levers 44 and 45
YP and yarn YB are sequentially guided into the slit 42 and checked.

Since the yarn end control blocks 11 and 12 have the same shape, only one will be described. As shown in FIG. 3, the yarn end control block 11 can be removed and replaced by loosening a set screw 15 provided on the frame 6. Further, as shown in FIG. 4, the yarn end control block 11 consists of a nozzle hole 11a and an ejection hole 11b that is inclined toward the back inside the nozzle hole.
The ejection hole 11b is arranged to coincide with an air guide hole 14 which is bored in the frame 6 and communicates with a compressed air supply pipe 13. When compressed air blows out, the nozzle hole 11
A vortex flow toward the back is generated inside a, and a suction flow is generated in the opening on the front plate 5 side to suck the yarn end YB cut by the yarn cutting device 20.

Next, yarn splicing using this device will be explained. When a thread breakage occurs in the thread being wound up from the lower bobbin to the upper package through the slit 42 of the thread detection device 41, the winding is stopped by an electric signal from the thread detection device and a splicing operation is performed. . First, the suction pipe 51 sucks and holds the package side yarn YP by a mechanism not shown and guides it to the front of the yarn splicing device 1. At this time, the yarn YP is attached to the end surface 40 of the bracket 40.
a and the end surfaces 44a of the switching levers 44, 45,
45a and is positioned in the slit 42. thread
If the YP has a defect such as being abnormally thick, a cutter (not shown) near the slit 42 will work to prevent the yarn YP from being cut.
has been cut and subsequent thread splicing has become difficult. Next, the switching levers 44 and 45 are switched to the first
The yarn YP turns about 30 degrees counterclockwise about the shaft 43 from the position shown in the figure, and moves to the escape grooves 44b and 45b. On the other hand, the pivoting lever 31 pivots counterclockwise from the position shown in FIG. 1 and clamps the thread YP between it and the clamp plate 32. Next, the suction pipe 50 similarly sucks and holds the bobbin side yarn YB and guides it to the front of the yarn splicing device 1. At this time, the yarn YB passes through the left side of the turning lever 31 and hooks 44C and 4 of the switching levers 44 and 45.
Contact with 5C. The state at this time is shown in FIG. 2. After this, the thread guide levers 25 and 26 turn until they come into contact with the stopper 27, and the thread presser lever 2
8. Turn both threads counterclockwise from the position shown in Figure 1.
Guide YPYB into the splicing hole 4.

Further, in the upper yarn clamping device 30, the turning lever 31 presses against the clamp plate 32 to fix the yarn YP, and in the lower yarn clamping device 33, the movable clamp plate 35 comes in pressure contact with the lever 34 to fix the yarn YB. The state at this time is the state shown in FIGS. 3 and 4, where the thread YP passes through the upper clamping device 30 guide groove 22b, the thread splicing hole 4, the thread cutting device 21, and the guide groove 23b, and the thread YB passes through the guide groove 22b of the upper clamping device 30. The groove 22a passes through the yarn cutting device 20, the yarn splicing hole 4, the guide groove 23a, and the lower clamp device 33. After this, thread cutting device 2
Yarn cutting is performed by 0, 21, and each yarn end YP/
YB is sucked into the nozzle holes 11a and 12a of the yarn end control blocks 11 and 12, which have started operating immediately before, and is defibrated.

Regarding the defibration effect, as in the explanation of the composition,
Only one of the yarn end control blocks 11 and 12 will be explained. Immediately before the yarn cutting device 20 cuts the yarn YB, compressed air directed toward the back of the nozzle hole 11a is ejected from the jet hole 11b, so that a suction flow is generated in the front opening, and the yarn cutting device The yarn end YB to be cut by 20 is sucked. As shown in FIG. 5, the yarn end YB is exposed to a vortex 52 in the direction of untwisting the yarn itself, particularly near the jet hole 11b. The yarn end YB is untwisted and the fibers are loosened to a nearly parallel state, and some of the fibers at the tip of the yarn end are scattered, resulting in a tapered shape that is good for splices. A separate yarn end control block that changes the position of the ejection hole so that when the twist direction of the yarn changes, the yarn end is exposed to the vortex in the direction that untwists itself, is controlled by the fiber length, number of twists, and yarn thickness. If this changes, we will replace it with another yarn end control block with a different ejection hole area, recessed ejection angle, etc., but we test these in advance and prepare good ones. . In addition, if the compressed air pressure and ejection time are appropriately adjusted, even better fibrillation of yarn ends can be achieved.

Now, the defibrated yarns YP and YB are pulled out from the nozzle holes 11a and 11b by the stopper 27 and the yarn shifting levers 25 and 26 to the left in FIG. Compressed air is sprayed into the splicing hole 4 from a jet hole (not shown) and spliced. When the splice is completed, the upper and lower clamp devices 30 and 33 release the now integrated yarns YP and YB, and the yarn presser lever 28 and yarn guide levers 25 and 26 move back, and the yarn leaves the splicing hole 4 and is wound. Picking will resume. The switching levers 44, 45 return to the original positions shown in FIG. 1, and the hook portions 44C,
The thread YB that was in contact with the thread 45C moves to the slit 42 and runs inside the slit 42. If the thread YB has a defect such as being abnormally thick, the cutter described above is activated and the thread splicing operation begins again. .

As explained above, appropriate yarn end control blocks are prepared in advance for each type of yarn scheduled to be processed.
When changing the yarn in progress, it is only necessary to replace the yarn end control block, which significantly saves time and effort compared to the conventional method, and increases the efficiency of using automatic winders in factories.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the pneumatic splicing device. Figures 2, 3, and 4 show the splicing operation of the pneumatic splicing device; Figure 2 is a front view of the pneumatic splicing device;
The figure is an enlarged front view, and FIG. 4 is a side view. FIG. 5 is an enlarged view of the yarn end control block section for explaining the defibrating action. 1... Pneumatic yarn splicing device, 11, 12... Yarn end control block, 11a, 12a... Nozzle hole, 1
1b...Blowout hole, 4...Year joining hole, 6...Frame, 13...Compressed air supply pipe, 14...Air guide hole,
15...Set screw.

Claims (1)

[Scope of utility model registration request] In a pneumatic yarn splicing device, two yarn ends are aligned and positioned in a yarn splicing hole, and a jet of compressed air is applied to the aligned two yarn ends to perform yarn splicing.The yarn ends are suctioned. A yarn end control block having a nozzle hole and a compressed air jet hole inclined toward the back of the nozzle hole is removably embedded in the frame by means of a set screw provided in the frame of the yarn splicing device. The frame is provided with air guide holes on both sides of the yarn splicing hole of the yarn end fibrillation device, which are formed in the frame to communicate with the jet holes of the yarn end control block and to the compressed air supply source. Type thread splicing device.