JP2789055B2 - Weft selection and supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a weft selective feeding device for a high-speed loom. According to the present invention, by reducing the number of movable parts so that the selected heald is closed at the supply position, it is possible to realize such a device which is simpler, more compact and more rational and economical than before. As a result, a continuous supply of the selected weft can be achieved without moving the heald.

Several different types of weft selection and supply devices are known in the state of the art.

In one type of this type of device, as described in Japanese Patent Application No. 2-168625 filed Jun. 28, 1990, a set of healds with different weft threaded through the eyelets is supported by a corresponding set of actuating levers. Have been. These actuating levers, which are spring-loaded to the transition limit, are moved at an angle by a corresponding set of pivoting selectors. These selectors, which are resiliently pressed against the attraction of one of the anchor members by a corresponding set of weft selection permanent magnets, are provided for the rocking of the rocking lever driven by a special cam mounted on the drive shaft of the device. Pushed forward by crossbar. A further spring-loaded lever is provided for the second actuating cam mounted on the device drive shaft, which lifts the preselected selector, which in each selected cycle is associated with the corresponding permanent magnet. The contact is made, so that the device is ready for the next choice.

In this arrangement, the selection and lowering of the selected selector is achieved by simply disabling the magnetic field of the associated permanent magnet, thereby exposing the selector to the lowering effect created by its recoil spring.

However, this device has a number of problems. Chief among them is the inability to feed the same weft in several similar cycles without returning the associated heald in each cycle. In fact, in this device, the presence of this additional lifting lever, which keeps the preselected selector constantly in contact with the associated permanent magnet in each cycle, is not impossible to keep this selector in its heald lowered position. However, it is extremely complicated. Thus, the heald is always returned by the operating lever return spring in each cycle.

Since the above-mentioned periodic movement of the heald occurs even when the same weft yarn is fed continuously, significant stresses are applied to the weft yarn that are alternately pulled or loosened, so that the weft yarn is The lifting by the pincer may be inaccurate or cut off if significant.

Another problem is that it requires the use of two separate actuating cams for the swinging member and the selector lifting lever, which complicates the mechanism and reduces the cost of the device. This may impair miniaturization.

It is an object of the present invention to solve the above-mentioned conventional problems and to be able to continuously supply the same selected weft yarn during several such cycles without returning the associated heald at each weft selection cycle. To provide a weft selection and supply device for a high-speed loom. This device requires only one actuating cam for both the supply of the weft thread and the preparation for the selection of the weft thread, which results in fewer moving parts and therefore less inertia and a simplified mechanism, The resulting fabric has considerable advantages because it is compact and inexpensive, and there is no undue stress on the selected weft that can be easily and effectively clamped by the pincer.

This basically means that the same oscillating crossbar of the oscillating lever, driven by a special cam mounted on the device drive shaft, has one of its ends engaged with the bottom teeth of the selector and the weft thread This is achieved by the fact that the feeding can be achieved and the other end is engaged with a set of anchor carrier levers which resiliently oppose these selectors. This pivots the anchors of these levers against the corresponding weft selection electromagnets against the lever recoil springs, thereby lowering all selectors and preparing for selection. Each anchor carrier lever is also integral with a ratchet pawl designed to engage the top teeth of the selector, which anchor carrier lever is magnetically held in contact with a suitable electromagnet. Close the hour selector to the supply position.

In fact, by providing the appropriate electromagnets in this way, the supply of selective healds is achieved. By maintaining the iron anchor of the appropriate anchor carrier lever, the electromagnet holds the associated selector in the lowered position and engages its lower teeth with the leading edge of the swing lever swing crossbar. This swing causes the swing crossbar to move forward and causes the associated actuating lever to pivot, thus rotating the heald. This heald is therefore lowered into the supply mode.

When several consecutive cycles of the same weft yarn are required, it is sufficient to keep the associated electromagnet energized.

This includes a suitable selector which is retained by a suitable anchor carrier lever and remains in the lowered position. Its return, determined by a suitable actuating lever spring, is blocked by the anchor carrier lever ratchet pawl abutting the top teeth of the selector. In this way, the entire mechanism represented by the heald, the actuating lever and the selector is closed in the advanced supply position, where the lower teeth of the selector are no longer affected by the rocking stroke of the rocking lever crossbar.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a set of healds (only one heald is illustrated in the drawing, and the other healds overlap with this). These Held Eyelets 2
Various weft threads 3 are passed through. These healds 1 are entirely supported by a corresponding set of actuating levers 4,
These actuating levers 4, which are pivotally mounted as shown at 5 on the side of the device casing 10, are brought to a travel limit 6 by a spring 7.

These levers 4 are moved at an angle by a corresponding set of selectors 8 pivoted at 9.
The leaf spring 11 presses the set of iron anchor carrier levers 13 pivotally mounted on the through shaft 14 against the ratchet pawls 12. The penetrating shaft 14 is supported by the casing 10, and the ratchet pawl 12 is pivotally mounted on the penetrating shaft 14,
A spring 15 applies thrust to the base.

Therefore, the selector 8 is a swing crossbar of the swing lever 17.
By 16 it is moved forward against the action of the spring 7. The swing lever 17 is provided at the casing
And is moved by a special cam 20 attached to the drive shaft 21 of the device by pushing with a spring 19. The crossbars 16 have their leading edges engaged with the bottom teeth 22 of their selector 8.

On the other hand, the trailing edge 16 "of the swinging cross bar 16 is engaged with a set of anchor carrier levers 13, and the iron anchor 23 pivotally mounted on the anchor carrier lever 13 is indicated by reference numeral 23 '.
Against the recoil spring 25, the corresponding weft selecting electromagnet 24 is rotated. The recoil spring 25 is the anchor carrier lever
13 is pressed against the movement limit 26 and held.

These selectors 8 also have top teeth 27 which engage with the aforementioned ratchet pawls 12 of the anchor carrier lever 13 to stop the return of the selector 8 so that the same thread can be continued. Stop heald 1 return when required to be delivered in several cycles.

 The operation of the device of the present invention is as follows.

Beginning with FIG. 1, a clockwise rotation of the drive cam 20 in the direction of the arrow 28 causes its contour 29 to swing clockwise about the pin 18 of the swing lever 17. The swing of the lever 17 is caused by a set of anchor carrier levers 13 on the side of the trailing edge 16 "of the swing bar 16 against the action of the reaction spring 25.
A corresponding counterclockwise rotation about the through-shaft 14 is produced. This causes the iron anchors 23 of these anchor carrier levers 13 to contact the respective weft selecting electromagnets 24.

On the opposite side, the counterclockwise rotation of the anchor carrier lever 13 causes its ratchet pawl 12 to rotate all selectors 8 clockwise about the pin 9 against the action of the leaf spring 11. As a result, these selectors are lowered.

This is the second stage of weft selection and preparation.
This is achieved as shown in the figure.

At this point, if the weft selection electromagnet 24 is not biased, when the swing lever 17 is driven by the cam 20 and swings counterclockwise, the anchor carrier lever 13 will not be held by the associated electromagnet 24 and the spring It is returned by 25 and rotates toward the movement limit 26, and the ratchet claw 12
So that the selector 8 has its leaf spring 11
Leave. This returns to the state shown in FIG.
The only difference is that while the leading edge 16 'of the oscillating crossbar 16 passes under the selector 8 without engaging the bottom teeth 22,
That is, the swing lever 17 continues the stroke in the counterclockwise direction. In this way, the actuating lever 4 remains at its travel limit 26 and all associated healds 1 continue to be raised.

Alternatively, if the electromagnet 24 is energized and the associated heald 1 is lowered to its supply position, the anchor carrier lever 13 held by the energized electromagnet remains in the pivoted position of FIG. Swing lever 17 driven by
Counterclockwise swing of this lever 17 swing crossbar 16
Are engaged with the bottom teeth 22 of the selector 8. The selector 8 is held at a lower position by an anchor carrier lever 13. This selector rotates the operating lever 4 counterclockwise about the pin 5,
Move the associated heald 1 outward as shown in FIG.

When the electromagnet 24 is deenergized and the heald 1 is returned, the anchor carrier lever 13 is no longer held by the electromagnet 24 via the iron anchor 23 and is returned by the spring 25, so that the movement limit 26 shown in FIG. Comes into contact with The swing lever 17 swings clockwise under the action of the cam 20 and the spring 19. During this time, the swinging lever 17 keeps in contact with the selector 8 at the lower position under the action of the return spring 7. The return spring 7 functions to return the heald 1 and the selector 8. Thus, the leg 30 of the selector 8
When contacting the leaf spring 11, the selector is rotated counterclockwise by the leaf spring, so that it completely returns to the state shown in FIG.

However, if the magnetization of the electromagnet 24 is maintained, the anchor carrier lever 13 remains attracted to this electromagnet via the iron anchor 23, and the clockwise swing of the swing lever 17 no longer involves the selector. Become. This selector 8 is held in the position shown in FIG. 4 by the end of the ratchet pawl 12 of the anchor carrier lever 13 and the anchor carrier lever 13 is still in the lower position, the top teeth 27 of the selector.
Is engaged. In this way, the heald 1 remains in the maximum extension position irrespective of the movement of the swing lever 17 since the crossbar 16 passes under the bottom teeth 22 of the selector 8. This position is maintained as long as the electromagnet 24 remains energized, thereby permitting a continuous supply of one weft thread for several cycles without returning the heald on each cycle.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a weft selection and supply device according to the present invention;
2 and 3 are cross-sectional views of the weft selection and supply device in a pre-selection stage and a supply stage, and FIG. 4 is a cross-sectional view of the weft selection and supply device in a continuous supply state. 1 ... heald, 2 ... eyelet, 4 ... operating lever,
6 ... Movement limit, 7 ... Spring, 8 ... Selector, 10 ...
Casing, 11… leaf spring, 12… ratchet claw, 13…
… Anchor carrier lever, 14 …… through shaft, 15…
… Spring, 16… Swing crossbar, 17… Swing lever, 19
… Spring, 20… cam, 21… drive shaft, 22… bottom teeth, 23… iron anchor, 24… electromagnet, 25… reaction spring, 26… travel limit… 27… top teeth Department.

Continuing from the front page (72) Inventor Giorgio Corciana Via Adise 1 in Piobene Roquette, Italy 1 (72) Inventor Filippo Freschi, Via Bichencino 23 in Vicenza, Italy 23 (56) References JP Sho 63-63 264951 (JP, A) JP-A-3-40839 (JP, A) Japanese Utility Model Application Sho 55-151885 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D03D 47/38

Claims (1)

(57) [Claims] The invention comprises a set of healds having eyelets through which different wefts are threaded, the healds being supported by a corresponding set of actuating levers, these actuating levers being spring loaded against the travel limit. Moved at an angle by a corresponding set of pivoting selectors pushed forward by the pivoting crossbar of the pivoting lever, the pivoting lever is moved by a cam mounted on the device drive shaft and the selector is moved to the lower position. At one time, in a weft selection and supply device in which one of the edges of the swing crossbar of the swing lever can be engaged with the bottom teeth of the selector, the other edge of the swing crossbar of the swing lever is The selector also engages a pair of resiliently opposing iron anchor carrier levers whose anchors oppose the lever recoil spring and correspond to the corresponding weft selection electromagnetic. Pivoted with respect to all selectors, each of the anchor carrier levers also has a ratchet pawl that engages one of the top teeth of the selector, the anchor carrier lever being magnetically held by an electromagnet. Wherein the selector is blocked at a lower supply position when the selector is turned on.