JPH0238707B2 - RYUTAIFUNSHASHIKISHOTSUKINOTASHOKUYOYOKOITOCHORYUSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid jet type weft storage device for a loom. The present invention relates to an improvement in a weft storage device in which a required number of winds of weft are wound, the weft is stored under the control of a mooring pin, and the weft is unwound for weft insertion and then supplied to a main nozzle.

In this specification, based on the movement of the weft yarn on the storage device, for the side closer to the yarn supply source,
For convenience, the expression "upstream" is used, and the expression "downstream" is used for the side closer to the main nozzle.

In addition, weft insertion generally starts at a crank angle of 90 to 110 degrees, and the weft yarn is unwound from the yarn storage drum in free flight, and immediately before the end of weft insertion, it enters restrained flight, and starts at a crank angle of 250 to 110 degrees.
Weft insertion ends at 270°, but for the sake of explanation below,
Weft insertion shall begin at a crank angle of around 90° and end at a crank angle of around 270°.

Further, when the thread binding pin is in a state of engaging with the weft yarn on the yarn storage drum and preventing its unwinding, the thread binding pin is said to be "in the action area" and starts to retreat from this action area. When the thread binding pin is eventually detached from the thread storage drum and no longer engages with the weft thread on the thread storage drum and does not interfere with its unwinding, the thread binding pin is said to be "in the standby area." At a predetermined timing, the tethering pin begins to advance from this standby area and eventually enters the action area again.

Regarding the above-mentioned so-called internal type storage device in which the yarn mooring pin approaches and moves away from the inside of the yarn storage drum toward the peripheral surface of the yarn storage drum, "leaving the action area" means that the yarn mooring pin moves toward and away from the yarn storage drum. This corresponds to recessing from above the circumferential surface, and "invading into the action area" corresponds to the yarn anchoring pin protruding onto the circumferential surface of the yarn storage drum.

As multicolor weft storage devices using locking pins, there have been known those in Japanese Patent Application Laid-Open No. 56-79740, and the one for 2×2 use in Japanese Patent Application Laid-Open No. 57-101039.

In the known device of JP-A-56-79740,
A rotating disk with a plurality of locking pins provided on its outer periphery is rotated in synchronization with the main shaft of the loom, and the weft wound by a winding arm between each locking pin is divided by the number of turns for one bit. It is stored and released to the downstream side of the yarn storage drum. However, since the opening period is a single fixed period, the unwinding from the yarn storage drum is adjusted to the multi-colored weft insertion conditions (2×1, 2×2, etc.) where the weft insertion start period is not uniform. Therefore, a blocking pin is provided on the downstream side of the weft for temporarily locking and unwinding the released weft.

Furthermore, in the device of JP-A No. 57-101039, the first to third locking pins are sequentially provided from the upstream side of the yarn storage drum, and for the same reason, the first locking pin and the second locking pin are provided sequentially from the upstream side of the yarn storage drum.
There is a cycle in which one bit of weft yarn stored separately between the third locking pins is temporarily locked by the third locking pin, and then unwound at the start of weft insertion.

As described above, the conventional device has an unavoidable drawback because it involves delivering the separately stored weft yarn to the most downstream locking pin. This is because the movement of the stored weft yarn in the longitudinal direction of the drum axis, that is, the sudden movement from the large diameter part to the small diameter part of the drum, causes the weft yarn that has been stored in sections to become suddenly loose, so the locking of the most downstream side of the drum This is because the arrangement of the weft yarns is disordered when the engagement with the pins is completed, and this causes errors in weft insertion due to entanglement with adjacent yarns, or loosening of the weft due to tension fluctuations. This is particularly noticeable when spun yarns or Bemberg yarns with low elongation are used. There is also the complexity of having to control three or more locking pins.

Furthermore, the device disclosed in JP-A-57-101039 has the disadvantage of generating abnormal tension at the end of weft insertion. That is, since each locking pin does not move in the longitudinal direction of the drum axis when locking the weft, the moment the weft on the downstream side of the locking pin is inserted and the storage amount becomes 0,
Since the weft yarn connected to the main nozzle is instantly stopped from being inserted by the engagement with the stationary locking pin, the tension of the weft yarn during transfer increases abnormally. As a result, the weft thread itself may be damaged, or the weft thread may spring back when inserted into the shed, causing its posture to become disordered.
The weft threads are woven in a relaxed state.

SUMMARY OF THE INVENTION The object of the present invention is to provide a simple device which does not require the transfer of stored weft threads from locking pin to locking pin, which causes the above-mentioned drawbacks. Another object of the present invention is to provide a weft storage device that generates less abnormal tension at the end of weft insertion.

In conventional devices, one weft worth of weft yarns is always stored separately using two locking pins and then inserted, but the present invention was developed with the focus on the fact that this is not necessarily necessary.

That is, two locking pins P arranged in parallel on the yarn storage drum
1. By reciprocating P2 along the axial direction of the drum by drive cams C1 and C2, a predetermined length of action corresponding to each of the locking pins P1 and P2 is produced along the approximately generatrix direction of the drum conical portion. area and a standby area downstream from the action area, and the locking pin P
1, P2 is a multicolor weft storage device that sequentially unwinds the wefts that are locked on the upstream side of each working area from a yarn storage drum in a standby area, and the first locking pin P1 is located in the working area. While the last wind for one pick is being wound on the upstream side of the second locking pin P2, the wind enters the action area upstream of the locked weft and becomes the second locking pin P2. The weft for one pick is stored separately between the first locking pin P1 and the second locking pin P2 immediately after the first locking pin P1 leaves the action area and enters the standby area. The present invention is characterized in that, while the last wind for one pick is being wound on the yarn storage drum, the length of the weft that enters the action area and is unwound from the drum is one pick.

The present invention will be explained in more detail below with reference to the accompanying drawings.

In the following explanation, a fixed type yarn storage drum will be exemplified, but it goes without saying that the present invention can also be applied to a rotating type yarn storage drum.

Further, as an example of its usage, the case of a 2×1 two-color weave is illustrated, but it goes without saying that it can be used not only for a 2×2 two-color weave but also for a single-color weave.

Furthermore, in the following explanation, the first yarn anchoring pin is an external type that approaches and moves away from the drum circumferential surface from the outside of the yarn storage drum, and the second yarn anchoring pin is an external type that approaches and moves away from the drum circumferential surface from the inside of the yarn storage drum. An example of a built-in type that appears in the room is shown below. However, this internal and external installation method may be reversed, or both may be an internal installation type, or both may be an external installation type.

Further, in each of the following figures, parts not directly related to the present invention are omitted or shown in a simplified manner.

The fixed drum 1 has an upstream conical part 1a and a downstream straight part 1b (preferably slightly conical) that is continuous with the conical part 1a, and the boundary between the conical part 1a and the straight part 1b is An elongated hole 1C is bored in the longitudinal direction of the drum shaft from the front to the rear.

A magazine 41 is installed on the outside of the circumferential surface of the fixed drum 1 in a fixed relationship thereto, and on the side facing the fixed drum 1 (lower side in the figure) is a long hole 41a extending in the longitudinal direction of the drum axis. is formed by drilling. The first locking pin P1 projects toward the fixed drum 1 through this elongated hole 41a, and its drive cam C1
is housed in the magazine 41.

That is, a support shaft 43 is fixedly supported on the internal frame 42 of the magazine 41 and extends in a direction perpendicular to the axial direction of the fixed drum 1, and a lever 46 is loosely fitted onto the support shaft 43. A first anchoring pin P1 is fixedly supported at one end of this lever 46 (the side closer to the fixed drum 1), and a roller 48 is fixedly supported at the other end.
is rotatably supported. A spring seat 51 is formed at an appropriate location on the lever 46, and a tension spring 54 is inserted between this and a spring seat 52 fixed on the internal frame 42.

The internal frame 42 further rotatably supports a cam shaft 56 extending in the same direction and parallel to the support shaft 43, and this cam shaft 56 has a cam C1 for driving the first thread pin P1. is firmly fitted. In the figure, only a part of the outline of the cam is shown. The camshaft 56 is operatively connected to an appropriate external drive source, for example, the drive shaft 2 of the yarn guide 21, by a known method. Since the roller 48 is always kept in elastic pressure contact with the cam C1 by the bias of the spring 54, as the cam shaft 56 rotates, the first thread anchoring pin P1 is moved around the support shaft 43, which will be described later. It moves in an arcuate orbit at a predetermined timing.

internal frame 3 in fixed relationship with fixed drum 1;
A support shaft 4 is fixedly supported perpendicularly to the longitudinal direction of the drum shaft. A bifurcated lever 7 is loosely fitted to the support shaft 4 at its apex corner, and a second lever 7 is attached to the downstream arm end of the lever 7 so as to face the drum circumferential surface.
A thread anchoring pin P2 is fixedly supported, and a roller 8 is rotatably supported at the end of the upstream arm.
Furthermore, a spring seat 9 is formed at a suitable location on the lever 7, and a compression spring 11 is interposed between this spring seat 9 and a spring seat (not shown) formed on the internal frame 3. It is inserted.

A cam shaft 19 that extends horizontally and parallel to the support shaft 4 is rotatably supported on the internal frame 3, and a cam C2 for driving the second thread pin P2 is fixed to this cam shaft 19. It is fitted. In the figure, only a part of the outline of this cam is shown. Since the roller 8 is always kept in elastic pressure contact with the circumferential surface of the cam C2 by the urging force of the spring 11, as the cam shaft 19 rotates, the second thread anchoring pin P2 moves around the support shaft 4. As will be described later, it moves in an arcuate orbit at a predetermined timing.

Next, FIG. 2 shows an example of a drive mechanism for the cam C2 for driving the second thread engagement pin P2. The source of this drive is from the drive shaft 2 of the rotary yarn guide 21. That is, the bevel gear 22 that is tightly fitted to the drive shaft 2 meshes with the bevel gear 24 that is integral with the rotating shaft 23 . A gear 2 integrally formed on the other end of the rotating shaft 23
8 meshingly engages with a gear 31 that is tightly fitted to a second rotating shaft 29 that is also supported by the internal frame 3. A bevel gear 32 formed at the other end of the second rotating shaft 29 is a bevel gear 33 formed at one end of the camshaft 19.
It is meshingly engaged with. Therefore, the rotation of the drive shaft 2 is transmitted to the camshaft 19 via the rotation shafts 23 and 29,
Cam C2 is rotationally driven.

Note that the first anchoring pin P1 and the second anchoring pin P2
and are located at positions slightly shifted from each other in the circumferential direction of the yarn storage drum, and are disposed so as to move in the longitudinal direction of the drum axis. Therefore, there is no possibility that the two vehicles will accidentally run into each other while moving.

Next, I will explain the operation.
In the case of 1 (that is, if wefts A and B are used, A,
Let us take as an example the case where the weft is inserted in the order of A, B, A, A, B). Therefore, two sets of weft storage devices are used in combination, and each cam C1 and C2 rotates as one cycle with a crank angle of 0 to 1080 degrees, and the solution for the first weft insertion is made between 0 and 360 degrees. Sewing is done, 360°~
A second weft insertion was carried out during 720°.
Unwinding for weft insertion is performed in the opposite weft storage device between 720 and 1080 degrees.

Figure 3 schematically shows the state of the mooring pin and weft storage or unwinding at each point in time () to (XII) during this period, and shows that 4 winds of weft are 1 wind.
Assume that it corresponds to the pick amount.

FIG. 4 is a timing diagram of the thread anchoring pins P1 and P2, with the vertical axis representing the position of the thread anchoring pin in the drum diameter direction relative to the drum circumferential surface, and the horizontal axis representing time (crank angle).

Time point () corresponds to a crank angle of 0°. At this point, both the first yarn anchoring pin P1 and the second yarn anchoring pin P2 are in the action area, but the second anchoring pin P2 has already started to retreat and is moving toward the downstream side. The weft yarn for the second weft insertion has already started to be stored upstream of the first locking pin P1, and the weft yarn for the first weft insertion has already started to be stored between the first and second locking pins. The weft threads are stored and held.

Time point () corresponds to a crank angle of 90°, and the first weft insertion begins. At this point, the first locking pin P1 is still stationary in the action area, but the second
As a result of continued retraction, the locking pin P2 separates from the action area. More specifically, it sinks inward from the circumferential surface of the drum. The weft storage on the upstream side of the first locking pin P1 continues, but the weft stored and held between the first and second locking pins is unwound by the traction force of the main nozzle that started weft insertion. I'm going to go.

Time point () corresponds to a crank angle of 180°. 1st
The state of the locking pin P1 remains unchanged, and the state of the second locking pin P2 remains unchanged.
is stationary in the standby area. Weft storage continues on the upstream side of the first locking pin P1, and weft unwinding continues on the downstream side of the first locking pin P1.

Time point () corresponds to a crank angle of 270°, and the first weft insertion is completed. Sometime before this point, the first
The locking pin P1 starts retracting and moves toward the downstream side. At this point, the weft for one pick on the downstream side of the first locking pin P1 is gone, but since the first locking pin P1 starts retracting in advance and moves downstream, the weft is slightly removed. This will loosen the weft, effectively relieving the impact on the weft at this moment.
The second locking pin P2 is stationary in the standby area. 1st
Weft storage on the upstream side of the locking pin P1 continues.

Time point () corresponds to a crank angle of 360°. 1st
The locking pin P1 continues to move back and forth, and the second locking pin P2
is stationary in the standby area. Weft storage on the upstream side of the first locking pin P1 continues.

Time point () corresponds to a crank angle of 450°, and the second weft insertion begins. That is, the first locking pin P1, which has continued to retreat, leaves the action area. More specifically, it moves outward from the peripheral surface of the drum. The second locking pin P2 starts advancing slightly before this point,
Move upstream. The weft yarn stored and held on the upstream side of the first locking pin P1 is unwound by the traction force of the main nozzle that has started weft insertion.

Time point () corresponds to a crank angle of 540°. At this point, the second weft insertion is continuing, and the first locking pin P1 is stationary in the standby area. The second locking pin P2 enters the active area at a suitable point between times () and (). More specifically, it protrudes outward from the peripheral surface of the drum. This appropriate time is immediately after the yarn guide 21 winds the last wound weft around the yarn storage drum for the second weft insertion and passes through the position where it enters the action area of the second locking pin P2. , just before the next weft yarn to be inserted passes through, that is, while the last wind for one pick is being wound on the yarn storage drum. Therefore, at time (), the weft has already started to accumulate on the upstream side of the second locking pin P2.

Time point () corresponds to a crank angle of 630°, and the second weft insertion is completed. The first locking pin P1 is stationary in the standby area. Sometime before this point, the second locking pin begins to be introduced and moves downstream.
At this point, the weft for one pick on the downstream side of the second locking pin P2 is gone, but in this way, the second locking pin P2 is
Since the locking pin P2 starts retracting and moves downstream, the weft becomes slightly slack, and the impact applied to the weft at this moment is effectively alleviated. Weft storage on the upstream side of the second locking pin P2 continues.

Second locking pin P2 before and after this point ()
The movement of the first locking pin P1 toward the downstream side before and after the time point ( ) is important in preventing abnormal tension at the final stage of weft insertion.

Time point () corresponds to a crank angle of 720°. 1st
The locking pin P1 remains stationary in the standby area, and the second locking pin P1
2 continues the exit. Weft storage on the upstream side of the second locking pin P2 also continues.

The time point () corresponds to a crank angle of 810°, and (XI) corresponds to a crank angle of 900°, the first locking pin P1 remains at rest in the standby area, and the second locking pin continues to retreat. Second
Weft storage on the upstream side of the locking pin P2 also continues.

Time point (XII) corresponds to 990°, but the first locking pin P1 starts advancing slightly before that, and the second locking pin P2 continues to move back and forth, and both of them are misaligned and end up in the state shown in the figure. Become. From this state, the first locking pin P1 continues to advance further and eventually enters the action area. At this point of entry, the last wind for one pick is wound on the upstream side of the second locking pin P2. The weft storage on the upstream side of the second locking pin P2 continues, and eventually reaches the state at time () and ends one cycle of operation.

As is clear from the above, according to the present invention, the two mooring pins individually and independently control the storage and unwinding of the weft yarn, so that the weft transfer between the mooring pins is not performed as in the conventional system. There are no problems caused by loose weft threads. Furthermore, if the locking pin in the action area is moved to the downstream side of the drum at the end of weft insertion,
The impact exerted on the weft yarns that are locked by the locking pins at the end of weft insertion is greatly reduced.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view showing one embodiment of the device of the present invention, Fig. 2 is a partially sectional side view showing a part of the cam drive mechanism, and Fig. 3 is () to (XII).
4 is an explanatory model diagram showing the operation, FIG. 4 is an operation timing diagram, and FIG. 5 is an explanatory diagram of the state at that time. 1... Fixed drum, 1a... Drum conical part, 1b...
Drum straight part, 2... Yarn guide drive shaft,
4, 43... Support shaft, 19, 56... Cam shaft, C1, C
2...Cam, P1, P2... Yarn pin, 21... Yarn guide.

Claims (1)

[Claims] 1. Two locking pins P1 arranged in parallel on the yarn storage drum,
By reciprocating P2 along the axial direction of the drum by drive cams C1 and C2, each locking pin P is moved along the approximate generatrix direction of the drum cone.
1, create a working area of a predetermined length corresponding to P2 and a standby area downstream from the working area, and locking pins P1, P2 are created.
2 is used in a pattern in which the same weft is inserted twice in succession, and the weft insertion is stopped at least once, in which the weft yarns that are locked on the upstream side of the working area are sequentially unwound from the yarn storage drum in the standby area. In the color weft storage device, the first locking pin P1 is locked while the last wind for one pick is wound on the upstream side of the second locking pin P2 in the action area. The weft yarn for one pick is stored separately between the second locking pin P2 and the first locking pin P1, and the second locking pin P2 Immediately after the first locking pin P1 leaves the action area and enters the standby area,
A fluid jet loom characterized in that, while the last wind for one pick is being wound on the yarn storage drum, the length of the weft that enters the action area and is unwound from the drum is equal to one pick. Multicolor weft storage device. 2. According to claim 1, the locking pins P1 and P2 in the action area move toward the downstream side at least before and after the weft insertion of the weft yarn located downstream of the locking pins P1 and P2 is completed. The device described.