BE1020503A3 - DEVICE FOR STORING FRAME WIRE IN A WEAVING MACHINE. - Google Patents

Description

DEVICE FOR STORING FRAME WIRE IN A TRADE

Weaving

BASIS OF THE INVENTION

The present invention relates to a weft yarn storage device in a loom which has a plurality of weft feeds.

In a shuttleless loom in which weft yarns of a predetermined length are successively inserted, there is known a method of storing weft yarn in which, before the insertion of a weft yarn, the weft yarn extracted from a weft feed is stored at the periphery of a drum to reduce the pressure on the weft yarn extracted and the variation of such friction during insertion weft thread. In a multicolour loom in which two or more weft yarns of the same or different type are used, there shall be a plurality of drums having the same number of said weft yarns adjacent to the yarn insertion mechanism. Weft yarn of the loom. Thus, it is necessary to increase the space required for the assembly of the loom and the complexification of the structure of the weft storage device is obtained, which gives rise to an increase in costs.

To solve such problems, for example, in Japanese Unexamined Patent Application Publication 48-4264, a device is disclosed for storing a weft yarn using a single drum for a plurality of weft feeds. In the device, a plurality of weft yarns are arranged in parallel and are drawn at positions adjacent to the periphery of the drum. The weft yarn to be inserted is moved in the direction of the drum axis via a weft yarn guide lever so as to hook with a pin that protrudes out of the drum. With the rotation of the drum, a predetermined length of the weft yarn is wound on the drum and comes to store there.

A plurality of weft guide levers are provided in association with the respective weft threads. Each weft guide lever is spring-loaded to tilt in the direction of the drum axis, but such tilting movement of the weft guide lever is normally restricted by a solenoid which is provided for each weft thread guide lever. In response to a weft insertion signal from a sample card having weaving data or a weaving pattern, the solenoid for the weft thread guide lever which is associated with the thread weft insert to be activated to release the weft guide lever. Then, the weft guide lever tilts under the effect of the spring so as to move the weft yarn into a position in which the weft yarn hooks with the spindle on the drum. With the rotation of the drum, the weft yarn is wound on the drum to store it.

In the device disclosed in publication 48-42164 cited above, in which the weft guide lever tilts under the compression force of the spring and returns to its starting position depending on the activation of the solenoid, the time during which the solenoid is activated in response to a weft insertion signal from the sample card tends to vary and therefore the length of the weft thread that is stored on the drum may also undergo variations. In addition, the weft guide lever which has tilted under the compression force of the spring can give rise to an unstable hooking of the weft yarn with the spindle on the drum under the influence of factors such as vibrations during commissioning of the loom. Such problems arise in particular in the case where the loom is operated at high speed for example at speeds of 600 to 700 rpm or more. In the device disclosed in publication 48-42164, when the weft guide lever is subjected to direct tilting and returns to its starting position via a mechanical mechanism such as a cam, the problems in question can be solved. , but several different mechanisms must be provided for the respective insertion patterns of the weft yarns, which makes it difficult to take into account the versatile requirements related to weft insertion patterns.

The object of the present invention is to provide a weft yarn storage device in a loom, which makes it possible to obtain reliable hooking of the weft yarn with the spindle on the drum and which also makes it possible to take account of versatile requirements related to weft insertion drawings.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, a weft yarn storage device in a loom includes a plurality of yarn feeds. of weft from which weft yarns are respectively extracted, a single rotary drum equipped with a movable spindle which projects out of the drum for attachment with the weft yarn and a weft yarn clamp which may be enabled to release the weft yarn at the beginning of the weft insertion and to maintain the weft yarn throughout the insertion of the weft yarn. The weft yarn that hooks with the spindle is curled and stored on the drum. The weft yarn storage device further includes a plurality of weft yarn guide levers movable in the direction of the drum axis, a cam mechanism for moving the weft yarn guide lever in the direction of the axis. drum to allow the weft yarn to hook with the spindle, and a plurality of restriction mechanisms to selectively restrict the movement of the respective weft yarn guide levers in response to an electrical signal.

Other aspects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate by way of example the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a plan view of a weft yarn storage device in an air jet type loom; Figure 2 is a front view of a cam of the weft yarn storage device; Figure 3 is a sectional view of the cam, taken along the line III-III of Figure 2; Figure 4 is a schematic view in which the operation of the cam and its associated follower roller is explained; Fig. 5 is a plan view similar to that of Fig. 1, but in which a way of storing the weft yarn is explained before insertion of the weft yarn; Fig. 6 is a plan view similar to that of Fig. 1, but in which a way of storing the weft yarn during insertion of the weft yarn is explained; Fig. 7 is a timing diagram explaining the relationship between the storage of the weft yarn and the insertion of the weft yarn.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, an embodiment of the present invention is described with reference to Figs. 1-7. Referring to Fig. 1, the weft storage device of the embodiment is adapted for use in a multi-colored loom of the air-jet type and includes two nozzles 1, 2 for inserting the weft yarn and their two associated weft yarn feeds 3, 4. The weft yarns which are intended for insertion via nozzles 1, 2 are designated Y1, Y2, respectively. A weft yarn gripper 5 which is activated by a mechanical mechanism such as a cam and two weft yarn guides 6, 7 which are arranged on opposite sides of the weft gripper 5 are provided upstream of the yarn. In a similar manner, a weft yarn gripper 8 and two weft yarn guides 9, 10 which are arranged on opposite sides of the yarn yarn gripper 8 are provided upstream of the nozzle 2. The weft yarn clamps 5, 8 can be activated to release the weft yarns Y1, Y2 at the beginning of the weft insertion and also to maintain the weft yarns Y1, Y2 upon completion of the weft yarn. insertion of weft thread. Tensioners 11, 12 each having a structure such that a weft guide is supported by a leaf spring are provided adjacent the weft feeds 3, 4, respectively. The weft yarns Y1, Y2 extracted from the weft feeds 34 are supplied to the nozzles 1, 2 while being guided and stretched by the tensioners 11, 12 and the weft guides 6, 7, 9, 10.

A single rotary drum 13, a cam 14 rotatable with the drum 13 and weft guide levers 15, 16 which can be activated in combination with the weft feeds 3, 4 respectively are provided. between the weft feeds 3, 4 and the weft grippers 5, 8. The drum 13 is in the form of a truncated cone and rotates in the direction indicated by the arrow in FIG. energy transmitted by a drive mechanism such as an electric motor (not shown) via a gear 17 and a hollow rotary shaft 18. A rod 19 is housed in the rotary shaft 18 and the drum 13 so as to perform reciprocating along the X axis of the drum 13 as indicated by the double-headed arrow. The rod 19 is driven to reciprocate via a mechanical mechanism such as a cam (not shown).

An L-shaped connecting rod 20 is pivotally mounted in the drum 13. One end of the L-shaped connecting rod 20 is connected to the end of the rod 19. The other end of the L-shaped connecting rod 20 is in the form of a pin 21 which is movable to enter the drum 13 and out of the latter. Pin 21 exits drum 13 as rod 19 moves along the X axis in one direction and returns to drum 13 as rod 19 moves along the X axis in the opposite direction. The rod 19, the L-shaped connecting rod 30 and the spindle 21 are integrated in rotation with the drum 13 while allowing the input and output movement of the spindle 21 with respect to the drum 13.

Referring to Figures 2 and 3, the cam 14 is provided with a plate-shaped cam 22 having a central hole 23 through which the rotating shaft 18 is inserted permanently. The plate-shaped cam 22 has at its periphery a cam surface which includes an upper portion 24 and a lower portion 25. A portion of the lower portion 25 which has the smaller radius forms a cam groove 27 defined by an arcuate wall 26 which is concentric to the surface of the cam 22 in the form of a plate. The plate-shaped cam 22 has an inlet portion 28 and an outlet portion 29 for the cam groove 27. The inlet portion 28 is disposed on the front side of the lower portion 25 and the outlet portion 29 is disposed on the rear side of the lower portion 25 when viewed in the direction of rotation of the plate-shaped cam 22. The inlet portion 28 and the outlet portion 29 are made via cuts made in the periphery of the cam 22 in the form of a plate.

The weft guide levers 15, 16 have the same structure, but different phases or different positions relative to the drum 13. The same reference numerals are used for the common elements of the weft guide yarn levers. 15, 16. Therefore, in the description which follows, only the weft guide lever 15 will be described. The weft guide lever 15 includes a vertical arm 30 extending perpendicular to the axis. X of the drum 13 and towards the cam 14 and a horizontal arm 31 which extends parallel to the X axis at a location outside the outer surface 13A of the drum 13 in the radial direction. These two arms 30, 31 are integrated for a generally L configuration. The weft guide lever 15 is movable towards and away from the X axis of the drum 13. The weft guide lever 15 is pressed by a spring 35 towards the axis X of the drum 13.

The vertical arm 30 has, at its lower end, a follower 32 which can hook with the surface of the plate-shaped cam 22. The horizontal arm 31 has a weft compression device 33 which is disposed facing the outer surface 13A of the drum 13. When the weft guide lever 15 is located at the maximum away from the X axis of the drum 13 in its stroke, the weft compression device 33 is disposed slightly away from the weft yarn Y1, at a location indicated by a dotted line in FIG. 1 (see the relationship between the lever weft guide 16 and weft yarn Y2 in FIG. 1). In this position of the weft guide lever 15, no weft yarn Y1 is wound on the drum 13. The cam 14, the spring 35 and the follower roller 32 cooperate to form a cam mechanism for moving the lever weft guide 15 in the direction of the X axis of the drum 13.

A solenoid 34 which corresponds to the restriction mechanism of the present invention is provided adjacent to the vertical arm 30 of the weft guide lever 15. The solenoid 34 serves to hold and release the weft guide lever 15 in response to a control signal issued by a controller (not shown). Specifically, the weft guide lever 15 is held so that the solenoid 34 protrudes so as to hook with the vertical arm 30 in response to a control signal from the controller, so that the weft guide lever 15 is held in its position furthest from the X axis of the drum 13. The weft guide lever 15 is released so that the solenoid 34 moves away from the vertical arm In response to a control signal issued by the controller.

The controller stores a program of weft insertion patterns based on a weave or weave pattern. In accordance with the selected weft insertion patterns, the controller transmits control signals to the nozzles 1, 2, weft grippers 5, 8, pin 21 and solenoid 34 to control the operation of these wefts. components. In response to an electrical signal from the controller, the solenoid 34 is activated to selectively restrict the movement of the weft guide lever 15 toward the X axis of the drum 13. It should be noted that the Reference symbols T, W and K as used in FIG. 1 denote warp yarns, woven fabric and weft cutter, respectively.

Hereinafter, the operation of the weft storing device according to the present invention is described with reference to FIGS. 1 and 4 to 7. In the present embodiment, as shown in FIG. Y1 frame is inserted first and then weft yarn Y2 is inserted. When the loom is put into service, before the insertion of the weft yarn Y1, a predetermined length of the weft yarn Y1 is stored in advance on the drum 13. For the storage of yarn Y1, the rod 19 moves to the right as shown in FIG. 1 via a drive mechanism (not shown) in response to a control signal from the controller, so that the pin 21 protrudes from the outer surface 13 of the drum 13 for hooking purposes with weft yarn Y1. Simultaneously, the solenoid 34 moves away from the vertical arm 30 in response to a control signal, so that the vertical arm 30 or the weft guide lever 15 is released.

When the follower roller 32 mounted on the weft guide lever 15 reaches the cam surface of the input portion 28 of the plate-shaped cam 22, the weft guide lever 15 is moved by the compression force of the spring 35 towards the X axis of the drum 13 while being guided along the cam surface. With such a movement of the weft guide lever 15, the weft yarn compression device 33 hooks on the weft yarn Y1 and then moves the weft yarn Y1 towards the outer surface 13A of the drum 13 from the position indicated by the dotted line in FIG. 1. Since the follower 32 is compressed against the cam surface of the inlet portion 28, as represented by the reference numeral 32A in FIG. weft guide lever 15 moves along the cam surface of the inlet portion 28. The inlet portion 28 has a longer length, as measured in the circumferential direction of the cam 22 in the form of a plate, and it is only necessary for the solenoid 34 to release the weft guide lever 15 within the range in which the follower 32 enters the inlet portion 28, which increases the flexibility to determine the the moment corresponding to the activation of the solenoid 34. In addition, such an input portion 28 also serves to absorb the variation of the moment corresponding to the activation of the solenoid 34 to release the weft guide lever 15.

As the follower 32 enters the cam groove 27 as indicated by the reference numeral 32B in FIG. 4, the weft guide lever 15 moves the weft yarn Y1 to the position indicated by a solid line. in FIG. 1, to which the weft yarn can hook with the spindle 21. The movement of the weft guide lever 15 is stably guided by the cam groove 27 as indicated by the reference numeral 32C in FIG. FIG. 4, without being affected by factors such as the vibration of the loom, which makes it possible to obtain reliable hooking of the weft yarn Y1 with the spindle 21, so that the winding of the loom can be triggered. weft yarn Y1 on the drum 13. The cam groove 21 serves to maintain the position of the follower roller 32 once the weft guide lever 15 has moved towards the X axis of the drum 13.

Then, the follower 32 moves into the cam groove 27 as indicated by the reference numeral 32D in FIG. 4 and then reaches the exit position 29. The weft guide lever 15 deviates from the axis X of the drum 13 together with the cam surface of the output portion 29 as indicated by the reference numeral 32E in FIG. 4.

Once the follower roller 32 has reached the top portion 24 of the plate-shaped cam surface 22, as indicated by the reference numeral 32F, the weft guide lever 15 is held in its furthest position. the X axis of the drum 13 by the upper portion 24 as indicated by the solid line in FIG. 6. In response to a control signal and by the controller, the solenoid 34 is activated to hook with the vertical arm 30 of the weft guide lever 15, so that the movement of the vertical arm 30 is restricted and therefore the weft guide lever 15 is kept in its initial position farthest from the X axis for the winding and subsequent storage of the weft yarn.

When the storage of weft yarn Y1 up to a predetermined length which is less than the length for a pick is completed, the spindle 21 retracts into the drum 13 as indicated by the dotted line in FIG. At the same time, the weft yarn clamp 5 releases the weft yarn Y1, and the weft yarn Y1 wound on the drum 13 is extracted therefrom to be inserted in a host of T chain yarns via the nozzle 1 .

As shown in FIG. 6, after the re-insertion of the spindle 21 into the drum 13, the weft yarn Y1 is extracted from the weft feed 3 and is wound on the drum 13, concurrently with the extraction of the spool 13. weft yarn Y1 from the drum 13 through the nozzle 1, because of the friction between the weft yarn Y1 remaining on the drum 13 and the outer surface 13A of the drum 13. The moment corresponding to the withdrawal of the pin 21 in the drum 13 is determined so that the sum of the lengths of the weft yarn Y1 wound on the drum 13 before and after the removal of the spindle 21 in the drum 13 corresponds to the length of a weft yarn Yl. The weft gripper 5 is activated to hold the weft yarn Y1 when a weft yarn Y1 has been fully inserted through the nozzle 1.

Then we proceed to the insertion of the weft yarn Y2 as shown in FIG. 7. Winding and storing of the weft yarn Y2 on the drum 13 via the forward weft guide lever 16 is carried out. the insertion of the weft yarn Y2 by the nozzle 2. When the solenoid 34 releases the weft guide lever 16, the weft yarn Y2 is guided towards the outer surface 13A of the drum 13 to hang on with the pin 21. The compressive force of the spring 35 and the cam 14 cooperate to adjust the movement of the follower roller 32 of the weft guide lever 16, thereby stabilizing the movement of the weft compression device 33 which guides the weft yarn Y2, resulting in reliable hooking of the weft yarn Y2 with the spindle 21. The winding and storing of the weft yarn Y2 on the drum 13 are made in a manner similar to the winding and storing yarn Y1 by the guide lever Weft yarn 15 and the description of the winding and storing type of yarn Y2 will be omitted.

The weft yarn storage device of the embodiment described above has the following advantages.

(1) In the above embodiment, in which the guiding of the weft yarns Y1, Y2 by the weft guide levers 15, 16 is carried out by the cam mechanism including the cam 14, the follower roller 32 and the spring 35, any variation in the moment corresponding to the activation of the solenoid 34 has little influence on the moment corresponding to the hooking and the release of the weft yarns Y1, Y2 with respect to the pin 21. In particular, the cam 14 including the cam groove 27, the input portion 28 and the output portion 29 provides a uniform and correct movement of the weft guide levers 15, 16 relative to to the drum 13, which simplifies the structure of the weft storage device. Further, the use of the cam mechanism which is activated by the solenoid 34, which may itself be activated in response to an electrical signal, selectively restricts the movement of the weft guide levers 15. , 16, so that multipurpose requirements of weft insertion patterns can be met.

(2) The follower roller 52 moves through the inlet portion 28 to enter the cam apparatus 27 and moves through the outlet portion 29 to exit the cam groove 27. providing the input portion 28 makes it possible to increase the freedom of adjustment of the moment corresponding to the activation of the solenoid 34. The fact of providing the cam groove 27 stabilizes the movement of the weft compression device 33 and consequently guiding the weft yarns Y1, Y2, which makes it possible to prevent the withdrawal of the weft yarns Y1, Y2 with respect to the spindle 21 because of the bouncing of the weft yarns Y1, Y2 caused by vibrations of the loom or the like.

(3) Pin 21 releases weft yarn Y1 (Y2) before winding a length of weft yarn Y1 (Y2) on outer surface 13A of drum 13. The moment corresponding to the release of weft yarn Y1 (Y2) through pin 21 is determined such that the sum of weft yarn lengths Y1 (Y2) wound on drum 13 before and after the release of weft yarn Y1 (Y2) through pin 21 corresponds to the length of a weft yarn Y1 (Y2), which is advantageous for the commissioning of a high-speed loom with respect to the case in which the spindle 21 retracts into the drum 13 after the winding a weft yarn pick Y1 (Y2) on the drum 13.

It will be understood that the present invention is not limited to the embodiment which has been described above and may be modified in various ways as illustrated below by way of example without departing from the scope of the present invention. 'invention.

(1) Cam 14 may be provided by a cam-groove-free cam such as groove 27 in the embodiment described above, and may also be provided by a planar cam or cam full, other than a plate-shaped cam.

(2) In the cam mechanism, the spring 35 may be replaced by any other active drive mechanism. The weft guide levers 15, 16 may have any other configuration and any other suitable structure as long as the weft guide levers 15, 16 have a follower as indicated by reference numeral 32 and a weft yarn compression device as indicated by reference numeral 33.

(3) The restriction mechanism of the present invention may not be limited to the solenoid 34 which may be activated in response to an electrical signal. For example, a pneumatic cylinder and an electromagnetic valve for controlling the pneumatic cylinder can be used as a restriction mechanism.

(4) Pin 21 which is activated mechanically can be replaced by any electrically activated pin or solenoid.

(5) Pin 21 is not limited to a mechanism in which pin 21, normally disposed within drum 13, exits drum 13. Alternatively, pin 21 may be disposed normally outside the drum 13. drum 13 and can enter the drum 13.

(6) The present invention can be applied not only to a loom in which two types of weft yarns such as yarns Y1, Y2 are inserted, as is the case in the embodiment described herein. above, but also to a loom in which three or more weft threads of the same type or of different types are inserted.

(7) The rod 19 may be provided by any electrically activated mechanism.

(8) It can be arranged for the pin 21 to move into the drum 13 after storing a length of weft yarn corresponding to a pick on the outer surface 13A of the drum 13.

(9) The present invention is applicable not only to an air jet type loom but also to any other type of loom such as a water jet loom. , a rapier loom and a gripper loom, wherein weft threads of a predetermined length are successively inserted.

Claims (4)

A weft yarn storage device in a loom, comprising: a plurality of weft yarn feeds from which weft yarns are respectively pulled; a single rotating drum equipped with a movable spindle projecting from the drum for hooking with the weft yarn; and a weft yarn collet that can be activated to release the weft yarn at the beginning of the insertion of the weft yarn and to maintain the weft yarn when weft insertion is complete; wherein the weft yarn after hooking with the spindle is wound and stored on the drum; characterized in that the weft yarn storage device further comprises a plurality of weft yarn guide levers movable in the direction of the drum axis; a cam mechanism for moving the weft guide lever toward the axis of the drum so as to hook the weft yarn with the spindle; and a plurality of restriction mechanisms for selectively restricting the movement of the respective weft guide levers in response to an electrical signal. The weft yarn storage device according to claim 1, wherein each restriction mechanism includes a solenoid for holding the weft guide lever away from the drum, the cam mechanism including a spring for weft guiding lever in the direction of the drum axis, a rotating cam with the drum and a follower roller mounted on the weft thread guide lever and which hooks onto the cam, the cam having a cam groove for maintaining the position of the follower roller after moving the weft guide lever toward the drum axis. The weft yarn storage device according to claim 2, wherein the cam has an input portion and an output portion for the cam groove, the follower roller passing through the input portion to enter the cam groove and passing through the exit portion to leave the cam groove. A weft yarn storage device according to any one of claims 1 to 3, wherein the spindle releases the weft yarn prior to winding on the drum a length of weft yarn corresponding to a pick, the moment corresponding to the release of the weft yarn by the spindle being determined so that the sum of the lengths of the weft yarn wound on the drum before and after the release of the weft yarn by the spindle is the length of one weft of the weft thread.