KR20040038789A - Negative dobby drawing mechanism and weaving loom equipped with such a mechanism - Google Patents

Abstract

PURPOSE: A negative dobby drawing device is capable of controlling shed easily. A weaving machine equipped with the same is characterized by having reliability and being inexpensive. CONSTITUTION: A drawing device for controlling a heddle frame contains a negative dobby(10). The drawing device comprises: an element operated by the dobby(10); flexible elements(30-33) connected with locking levers(11,11') of the dobby(10); the locking levers(11,11') having fixed amplitude; a readout system(20) and a double rotation lever(14) installed on the locking lever with regard to momentary stop of the locking lever; a hook(15) formed on the double rotation lever(14) interlocked selectively; and a return lever(40) installed the flexible element on a method capable of controlling.

Description

NEGATIVE DOBBY DRAWING MECHANISM AND WEAVING LOOM EQUIPPED WITH SUCH A MECHANISM

The present invention relates to a drawing mechanism for controlling a heddle frame of a loom equipped with a nagative dobby. The invention also relates to a loom equipped with such a drawing mechanism.

In the field of passive dobby, it is known, for example, from EP-AO 527 095 to manufacture a drawing mechanism for controlling the head frame of a loom, where a flexible element, such as a cable, has a return spring assembly or register on one side. On the other hand, the other extends to the dobby controlled member, the flexible element being held on two return levers each coupled to the head frame. There are as many flexible elements and lever sets associated with them as there are headed frames to be driven. This known drawing mechanism is relatively complex as long as a shed adjustment device is to be provided in the connection area between the flexible element and the dobby driven member. In that case, the aforementioned member driven by Dobby must be mechanically connected in an adjustable manner to a rocking lever which is itself driven by Dobby. This results in a complex and relatively heavy structure that is subjected to violent acceleration when Dobby is in operation. In this type of device, the shed adjustment elements are arranged inside the dobby. Therefore, these shed control elements are difficult to access.

It is a particular object of the present invention to overcome the above mentioned problems by proposing a novel drawing mechanism which is simplified compared to the state of the art and allows for easy adjustment of the shed.

1 is a schematic view of a loom according to the present invention, partially broken away from the support beam and hood of a dobby;

2 is a perspective view of a portion of the loom of FIG. 1.

FIG. 3 is an enlarged view of part III of FIG. 1 with the rod for adjusting the position of the spring assembly removed for clarity.

FIG. 4 is a view similar to FIG. 1 for another instrument in a second embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

M: Loom 10: Dobby

11, 11 ': Locking lever 12: Common shaft

13: hood 14: rotating lever

21: retaining hook 20: reading device

22: control unit 30: cable

40, 50: return lever 41, 42, 51, 52: connecting rod

43: lug 60: (spring) assembly

70: (header) frame 313: screw

315: Stirrup Element

In this spirit, the present invention is a drawing mechanism for controlling the head frame of a loom equipped with a passive dobby, comprising a flexible element for each head frame extending between a member actuated by the dobby and a return assembly or register. The component relates to a drawing mechanism for a head frame control extending on the member, on the assembly, and on two return levers respectively connected to the frame. The drawing mechanism has a flexible element directly connected on the locking lever of the dobby, the locking lever having a fixed amplitude, which locking lever selectively engages with the reading device of Dobby in consideration of the momentary stop of the locking lever. It is equipped with a double pivot lever provided with a hook which is adapted to be connected, and the flexible element is also connected in an adjustable manner to one of the return levers so that the distance between the pivot axis of the return lever and the flexible element is variable. It is characterized by.

According to the invention, the aforementioned shed control device does not need to be provided at the level of Dobby, which can be greatly simplified, since the shed control device is more accessible and structurally simpler than the elements of Dobby. This is because it is offset at either level.

According to an advantageous but non-limiting aspect of the present invention, the apparatus incorporates one or more of the following features.

A fixed amplitude locking lever is equipped with a shoe that supports and guides the flexible element.

The return lever, to which the flexible element is adjustablely connected, is provided with a stirrup element which moves about this return lever and which extends the flexible element. In this case, this extension is advantageously extended in a direction approximately perpendicular to the direction of the flexible element between the locking lever and the return lever.

The flexible element is formed by a plurality of parts respectively extending between the locking element and the first return lever, between the two return levers and between the second return lever and the return spring assembly.

The dobby is provided with a plurality of locking levers articulated about a common axis, wherein the distance between the extension section of the flexible element of each of these locking levers and the common axis is not the same for all of these locking levers. . These locking levers can be distributed in two or more groups, in which the distance between the extension region of the flexible element and the common axis is the same, which distances vary from group to group. In particular, the value of this distance can be increased from the front of the shed to the rear.

The drawing mechanism is supported by a superstructure having a U-shaped beam having a cross section approximately open at the top and arranged in a substantially horizontal direction above the head.

The invention also relates to a loom equipped with a drawing mechanism as described above. Such looms are more reliable and less expensive than the latest ones.

The following description of the three embodiments of the shed forming mechanism according to the principles of the present invention, given solely by way of example and with reference to the accompanying drawings, will make the present invention easier to understand, and the other advantages of the present invention become clearer. Will be.

The loom M shown in FIGS. 1 to 3 includes a small dove 10 mounted with a locking lever 11 pivoting about a common axis 12. In FIG. 1 only one locking lever 11 can be seen as a whole, the hood 13 of the dobby 10 is partially broken and the second locking lever 11 ′ is partially visible.

The locking lever 11 is equipped with a double pivot lever 14 supporting the hook 15 which is to be interlocked with the retaining hook 21 controlled by the control unit 22. The retaining hook 21 and the control unit 22 belong to the reading device 20 of the dobby 10.

Similarly, the other locking levers 11 'and the equivalents are equipped with double rotating levers provided with hooks which are to be interlocked with the reading device 20.

As indicated by the double arrow F ₁ , the locking lever 11 and the equivalent pivot about a common axis 12 at a fixed amplitude. These locking levers may optionally be held near the dead point of their stroke by interlocking of the hooks 15, 21.

As shown with respect to the locking lever 11 ′ in FIG. 1, a flexible cable 30 is connected to each locking lever 11 and an equivalent. The cable 30 extends from each locking lever 11 or 11 'to the first return lever 40 and extends to this return lever 40 to extend from this return lever back to the second return lever 50. And it extends to this return lever 50 similarly. The cable 30 includes a spring assembly 60 or a resistor (from the second return lever 50, including a spring 61 for elastic return of the locking lever 11 and the return levers 40, 50). toward a register, these elements extend to a predetermined position. The path of the cable 30 is between the first locking lever 11 and the first return lever 40, between the first return lever 40 and the second return lever 50, and with the second return lever 50. Go straight between the assemblies 60. In this way, there is no need to provide return pulleys other than the first return lever 40 and the second return lever 50 in the path of the cable 30.

Each return lever 40, 50 is individually connected to the frame 70 by two connecting rods 41, 42; 51, 52, in which only a few heads can be seen in the figure. 71 is mounted.

Indeed, the cable 30 has a plurality of parts, namely a first portion 31 extending between the first locking lever 11 and the first return lever 40, a first return lever 40 and a first portion. A second portion 32 extending between the second return lever 50 and a third portion 33 extending between the second return lever 50 and the spring assembly 60.

The portions 31 to 33 together extend between the flexible element, ie the first locking lever 11 and the spring assembly 60 and the cable 30 which is continuously supported on the return levers 40, 50. Configure

The portion 31 is provided at its front end 311 with a loop 312 adapted to engage with each locking lever 11 and a hook 112 provided on an equivalent. Each of these locking levers 11 and their equivalents is also provided with a shoe 111 made of elastomer or other material to support and guide the cable 30.

Each shoe 111 has a fan shape centered on the common axis 12. In a modification, these shoes 111 may be centered on the intermediate axis between each shoe 111 and the common axis 12.

The part 31 is connected to two plates 314 whose opposite ends 313 are articulated on the stirrup element 315, which is the main part of the return lever 40. Approximately perpendicular to the axis of rotation 45 of this return lever 40 from the portion 44 and to the direction B-B 'of the cable 30 between the locking lever 11 and the return lever 40. It is possible to slide on the lug 43 extending in the in-direction A-A '.

Reference numerals 43a and 43b denote both edges of the lug 43 that are parallel to each other and to the direction A-A '.

The double arrow F ₂ indicates the slideability of the stubble element 315 on the lug 43.

The stirrup element 315 is equipped with a screw 316 which applies a stopping force F ₃ of the stirrup element 315 along the lug 43.

By sliding the stirrup element 315 along the lug 43, the distance d between the portion 31 of the flexible cable 30 and the shaft 45 can vary.

In this way, it is possible to slightly offset the point of action of the traction force F ₄ exerted on the return lever 40 by the part 31 of the cable 30 with respect to the axis 45, which is the return lever. It is possible to adjust the stroke of the frame 70 controlled by (40, 50), i.e. to adjust the shed obtained with the loom M.

The part 32 is connected to the return levers 40, 50 by its ends 321, 322, respectively. In the case of the part 33, it is connected to a spring assembly 60, which is arranged between the return levers 40, 50 by its respective ends 331, 332.

The main part 44 of the return lever 40 is made of steel. It is integral with the lug 43. The main part 44 is provided with a sector 46 which holds the part 32 of the cable 30 near its end 321. This sector may be made of a synthetic material. The main part 44 is also provided with a hook 47 for extending the part 32. The sector 46 forms a zone Z ₄ of the return lever 40, wherein the portion 32 of the cable 30 extends from the zone to the zone Z ₅ of the return lever 50. The end 322 of the part 32 contacts the zone Z ₅ . The zone Z ₄ is disposed between the axis 45 and the frame 70, ie below this axis, while the zone Z ₅ is above the axis 45, ie with respect to the axis 55. 70).

The return lever 50 also forms a second zone Z ' ₅ which is disposed between the shaft 55 and the frame 70, the portion 33 being the direction of vibration of the frame 70 from this zone. It extends in the direction substantially perpendicular to (Z-Z ').

Due to the distribution of the zones Z4, Z5, Z ′ ₅ , the parts 32, 33 constituting the cable 30 do not intersect the connecting rods 41, 51, so that the connecting rods It is possible to provide a width that imparts good mechanical properties to the cables.

In practice, the return lever 50 is formed by two sectors 56, 56 'made of synthetic material to form the zones Z5, Z' ₅ , with a metal insert between these sectors. ) Is arranged.

The return levers 40 and 50 may be considered as "pull levers" due to their geometry.

With the above description in mind, the shed generated by each frame 70 can be adjusted by displacing the stirrup element 315 on the extension 43, which is easily accessible over the hurdle frames. It is possible.

When the desired adjustment is made, ie the required distance d between the cable 30 and the shaft 45 is formed, the stubble element 315 extends on the lug 43 due to the screw 315. . In order to facilitate such adjustment, the scale 43 (not shown in the drawing) may be provided on the lug 43.

The shed's adjustment can vary from frame to frame.

In order to prevent the lugs 43 provided on each return lever 40 from becoming too long, the locking lever 11 and the equivalent have two dimensions, i.e. the center of the common shaft 12 between the two groups of levers. It can be provided to have a geometric shape such that the pivot radius R of the individual shoes 111 is different. In the example shown, these levers are distributed in two groups, a lever 11 having a relatively small pivot radius R of the shoe 111 and a lever 11 'having a relatively long radius R'. It is.

In fact, larger radius R 'levers are installed on the back side of the shed, i.

The above-mentioned elements are supported by a beam 80 with a major axis X-X 'horizontal, which is arranged on the frame 70 of the loom, through which connecting rods 41 and 51 pass. The opening 84 is provided.

As can be seen in more detail in FIG. 2, the beam is a U-shaped cross section that opens approximately upwards, with the pivot axis 45 of the return lever 40 being the two side webs 81, 82 of the beam. Is supported by. In the same way, the pivot axis 55 of the lever 50 is supported by the side web of the beam 80.

A rod 62 extends between one end 83 of the beam 80 and the spring assembly 60, and the rod 62 is provided with a system for adjusting the tension of the spring 61. It is possible to adjust the elastic force generated by the spring assembly 60 on each flexible cable 30.

In the second embodiment of the present invention shown in Fig. 4, elements similar to those of the first embodiment are denoted by the same reference numerals. In this embodiment, the sector Z of the second return lever 50 and the zone Z ₄ of the first return lever 40 in which the second portion 32 of the flexible cable 30 is similar to that of the first embodiment. Extends between the second zone Z ₅ formed by the zone Z ₅ , which is essentially different from the above in that it is disposed between the pivot axis 55 of the lever 50 and the frame 70. . In this way, the portion 32 is approximately perpendicular to the vibrational direction Z-Z 'of the frame 70.

In addition, the spring assembly 60 disposed between the return levers 40 and 50 has an area Z ′ ₅ disposed opposite the frame 70 with respect to the pivot shaft 55 and the return lever ( It is connected to the return lever 50 by a portion 33 extending between the regions defined by the second sector 56 ′ of 50. The portion 33 is approximately perpendicular to the direction Z 'between the return lever 50 and the spring assembly 60.

As described above, the stirrup element 315 from which the end 313 of the cable 30 extends can slide along the lug 43 formed by the return lever 40, so that the return lever The distance d between the pivot axis 45 and the cable 30 is variable.

According to the present invention, a novel drawing mechanism is provided which greatly simplifies the structure and can easily adjust the shed. In addition, according to the present invention, such a drawing mechanism provides a reliable and inexpensive loom.

Claims (12)

A drawing mechanism for controlling the head frame of a loom equipped with a small dobby, A flexible element extending between each dowel actuated member and a return assembly or register for each headframe, the flexible element being connected to the member, on the assembly, and respectively to the frame; Connected on two return levers, The flexible element 30-33 is directly connected on the locking levers 11, 11 ′ of the dobby 10, the locking lever has a fixed amplitude, and the locking lever has a momentary stop of the locking lever. In consideration of this, the dual pivot lever 14 is provided with a hook 15 adapted to selectively interlock with the reading device 20 of the dobby, and the flexible element is also one of the return levers 40, 50. And a distance (d) between the pivot axis (45) of the return lever and the flexible element, which is connected in an adjustable manner (F ₂ ) to (40). The method of claim 1, And a shoe (111) for supporting and guiding the flexible element (30-33) to the locking lever (11, 11 ') of fixed amplitude. The method according to claim 1 or 2, A return lever 40 to which the flexible element 30 is adjustablely connected is provided with a stubble element 315 which flows with respect to the return lever (F ₂ ) and to which the flexible element is connected. Instrument. The method of claim 3, The extension 43 is in a direction A-A 'approximately perpendicular to the direction B-B' of the flexible element between the locking levers 11, 11 'and the return lever 40. Drawing apparatus, characterized in that extending. The method according to any one of claims 1 to 4, The flexible element 30 is respectively between the locking levers 11, 11 ′ and the first return lever 40, between the return levers 40, 50, and the second return lever 50 and the return. Drawing device, characterized in that it is formed by a plurality of parts (31, 32, 33) extending between the assemblies (60) of the spring (61). The method according to any one of claims 1 to 5, A plurality of locking levers 11, 11 ′ are provided which are connected about the common shaft 12, and the connecting section 111 and the common shaft 12 of each flexible element 30 on the locking lever are provided. And the distance between them is not equal for all of the locking levers. The method of claim 6, The locking levers 11, 11 ′ may be divided into two or more groups in which the distances R and R ′ between the connection region of the flexible element and the common axis 12 are the same, and the distances differ from group to group. The drawing apparatus characterized by the above. The method according to claim 6 or 7, And the value of said distance (R, R ') increases from front to back of the shed. The method according to any one of claims 1 to 8, And the drawing mechanism is supported by a superstructure having a U-shaped beam (80) whose cross section is approximately open at the top and arranged in a substantially horizontal direction (X-X ') above said head. The method according to any one of claims 1 to 9, The flexible element 30-33 is in the region Z ₄ of the first return lever 40 disposed between the rotational axis 45 of the first lever return 40 and the frame 70. The assembly 60 extends substantially with the zone Z ₅ of the second return lever 50 disposed opposite the frame with respect to the pivot axis 55 of the second return lever 50. Zone Z ′ ₅ of the second return lever 50 disposed between the return levers 40, 50 and the pivot shaft 55 of the second lever 50 and the frame 70. Disposed between the flexible elements extending between the elements, the assembly being substantially perpendicular to the direction of vibration (Z-Z ') of the frame. The method according to any one of claims 1 to 9, The flexible element 30-33 is roughly the region Z ₄ of the first return lever 40 disposed between the longitudinal axis 45 of the first return lever 40 and the frame 70. The assembly 60 extends approximately with the zone Z ₅ of the second return lever 50 disposed opposite the frame with respect to the rotational axis 55 of the second return lever 50. Zone Z of the second return lever 50 disposed opposite the frame 70 with respect to the return levers 40, 50 and the rotational axis 55 of the second return lever 50. ' ₅ ) disposed between flexible elements extending between the assembly, wherein the assembly is approximately perpendicular to the direction of vibration Z-Z of the frame. Loom with a drawing mechanism (10-80) according to any one of the preceding claims.