WO2006043749A1

WO2006043749A1 - Rapier and grippers for rapier loom

Info

Publication number: WO2006043749A1
Application number: PCT/KR2005/002847
Authority: WO
Inventors: Gyu-Sung Lee
Original assignee: Dae Hung Precision Co Ltd
Current assignee: Dae Hung Precision Co Ltd
Priority date: 2004-10-21
Filing date: 2005-08-27
Publication date: 2006-04-27
Anticipated expiration: 2007-04-21
Also published as: KR100498003B1; CN101035939A

Abstract

The present invention provides a rapier and gripper for a rapier loom, in which the rapier and gripper are constructed to be able to move within any predetermined range in the tape, so that the weft thread can be transferred by using an inertial force produced when they stop at the middle point, and the tension produced at the weft thread, wherein the rapier and the gripper for the rapier loom is characterized by comprising: a rapier body 111 and a gripper body 112, each of which is formed to be streamlined so that it can easily progress into a shedding 102, and is provided with a head portion 110 formed with an engaging hook 109, each lower side of which is engaged with a base 114 secured by means of a tape 108 and a connection step portion 113; slots 115 formed at the front of the base 114 to be a length L enough to transfer the weft thread 107 after the rapier 105 and the gripper 106 cross-contact it, and through which the tape and the base are secured to the rapier body 111 and the gripper body 112 by means of securing means 116, so that the rapier body 11 and the gripper body 112 can move slidably with respect to the bases 114 by means of the inertial force produced at the time of stop of the tape 108; and supporting plates 120 formed at the rear side of the engaging hooks 109 formed at the rapier body 11 and the gripper body 112 to project in one side, to which the weft thread 107 to be transported is picked through the cooperation of the gripping headers 122 formed at the front side of gripping levers 121 provided rotatably to the rapier body 111 and the gripper body 112, wherein the projections 123 formed at the rear side of the gripping levers 121 are constructed such that they can be picked to and unpicked from the actuating projections 125 formed at the bases 114.

Description

Description RAPIER AND GRIPPERS FOR RAPIER LOOM

Technical Field

[1] The present invention relates to a rapier and gripper for a rapier loom using an inertial force and weft thread tension, in particular to a rapier and gripper for a rapier loom, which is improved in transferring the weft thread more easily and completely by supplementing the disadvantages of the positive and non-positive type rapier looms. Background Art

[2] In general, according to the rapier loom, a warp thread are moved up and down al¬ ternatively to form a shedding, and a rapier and a gripper are also moved to a middle position from both sides of the warp thread by means of a transporting device to the shedding so that weaving is accomplished by the gripper's cross-contacting and transferring the weft thread transported by the rapier, and repeating the beating operations.

[3] As described above, the let-off manners of the weft thread from the rapier loom are divided into a non-positive type and a positive type.

[4] In case of the non-positive type, the rapier and the gripper are attached to the transporting device such as a tape or a band, and the weft thread transported by the rapier are inserted into a gripping lever when the gripper catches the weft thread.

[5] In such non-positive type, since the weft thread are inserted into the gripping lever to thereby block second operation, resulting in the disadvantage that it is impossible to catch various types (shape and thickness) of thread. Especially, since a part of the thread is gripped if the thread is thick or it has a number of strips such as thread of no edges, they can be cut or released.

[6] Further, in case of particular thread such as a drop thread of irregular gripping point, a slub thread or a metal thread in which it is very easy to be slipped based on its property, there is produced a disadvantage that t is impossible to transport because it cannot be gripped properly.

[7] Also, in case of the positive type, the rapier and the gripper are attached to the transporting means such as a tape or a band, and the weft thread transported by the rapier are gripped directly by a gripping lever when the gripper catches them.

[8] In such positive type, it is advantageous that almost all the types of the thread can be gripped as the weft thread can be directly picked. However, it is disadvantageous that additional cam means should be provided for gripping them through the second operation at the middle position.

[9] In such cases, although it is required that the gripping levers installed to the gripper and the rapier can be concurrently operated without any errors by performing the second operation through the mechanical pressing of the gripping lever, faulty operation of the transferring of the weft thread is produced if the operational errors are occurred, so that it is impossible to increase the working speed to thereby cause problem that it is impossible to increase the entire productivity.

[10] Also, since the transporting means for moving the rapier or the gripper cannot be formed of the tape or the band, but it is formed of a stock, which is less consumptive, so that it is required to prepare additional space at the both sides of the loom for coping with the movement distance of the stock. Accordingly, problems are caused such that it is required to secure unnecessary installing space for the transporting means to thereby reduce the number of the looms installed at the same area.

[11] In addition, the tape can be used for the transporting device, however, it is difficult to keep the precision degree of the tape owing to the bending and abrasion of the tape. Disclosure of Invention Technical Problem

[12] The present invention has been made to solve the above-mentioned problems occurring in the conventional art, and the object of the present invention is to provide a rapier and gripper for a rapier loom, in which the rapier and gripper are constructed to be able to move within any predetermined range in the tape, so that weft thread can be transferred by using the inertial force produced when they stop at the middle point, and the tension produced at the weft thread.

[13] Further, another object of the present invention is to provide a rapier and gripper for a rapier loom, in which it is possible to reduce the whole costs and to increase the utilizing possibility of the space and to serve to increase the weaving property and so on by constructing them to transfer the weft thread accurately without some errors at the gripping point with simple structure.

Advantageous Effects

[14] As described above, according to the rapier and the gripper for the rapier loom using the inertial force and the weft tension of the present invention, it is possible to reduce the whole production cost because it is not required to install such complex cam device as was employed in the conventional positive type, although the rapier and the gripper perform the second operation for picking the weft thread at the central position of the shedding, and it is also possible to decrease the space for installing the loom by using the tape employing the transporting device generally.

[15] Also, it is possible to prevent the abrasion produced from the friction with various elements provided with the rapier and the gripper because the weight of the rapier and the gripper of the present invention are smaller than that of the conventional cam type rapier and the gripper, to thereby operate the loom smoothly. [16] Further, it is possible to increase the weaving velocity of the loom because the weft thread can be transferred accurately without any error, and is also possible to increase the weaving efficiency because the thread can be transferred accurately regardless of the types of the thread. [17] In addition, according to the present invention, it is possible to reduce the mechanical load and to greatly increase the production velocity by making the keeping operation for transferring the weft thread to be performed by means of the inertial force and the weft tension through using the gripping lever, which requires no separate additional construction, to thereby accomplish various effects such as enhancing the whole weaving efficiency and the weaving quality, and the like.

Brief Description of the Drawings [18] FIG. 1 is a diagram showing an operation state of a rapier and a gripper for a rapier loom for explaining the present invention; [19] FIG. 2 is a perspective view showing the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention; [20] FIG. 3 is a perspective view showing an extracted gripping means of the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention; [21] FIG. 4 is a cross-sectional view of the gripping means taken along line A - A in the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention; [22] FIG. 5 is a cross-sectional view of the gripping means taken along line B - B in the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention; [23] FIG. 6 is a cross-sectional view of the extracted "C" portion, which is the gripping means of the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention; [24] FIG.7 is a cross-sectional view of the gripper for the rapier loom using the inertial force and the tension of the weft thread according to another embodiment of the present invention.

Mode for the Invention [25] Hereinafter, the rapier and the gripper for the rapier loom of the present invention will be described in detail with reference to the appended drawings. In the drawings, the same reference numerals are used to designate the same or similar components through all the drawings, and so repetition of the description on the same or similar components will be omitted.

[26] In the present invention, FIG. 1 is a diagram showing an operation state of a rapier and a gripper for a rapier loom for explaining the present invention, FIG. 2 is a perspective view showing the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention, FIG. 3 is a perspective view showing an extracted gripping means of the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention, FIG. 4 is a cross-sectional view of the gripping means taken along line A - A in the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention, FIG. 5 is a cross-sectional view of the gripping means taken along line B - B in the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention, and FIG. 6 is a cross-sectional view of the extracted "C" portion, which is the gripping means of the rapier and the gripper for the rapier loom using the inertial force and the tension of the weft thread according to the present invention.

[27] As shown in the drawings, a general rapier loom 100 is constructed such that, warp thread 101 are moved upwardly and downwardly alternatively to form shedding 102, and a rapier 105 and a gripper 106 are moved from both sides of the warp thread 101 to the middle point so that weft thread 107 transported by the rapier 105 are cross- contacted and transferred by the gripper 106 to the shedding, and repeats the beating operations to thereby accomplish the weaving.

[28] The present invention has features that the rapier 105 and the gripper 106 for the rapier loom 100 are improved to use a tape 108, which is transporting means, operated by a transporting device 103 to grip and transfer the weft thread 107 positively by means of the inertial force and the weft thread tension.

[29] In the present invention, a rapier body 111 and a gripper body 112 having head portion 110 formed with an engaging hook 109, are shaped as streamline so that the weft thread 107 can be easily progressed into the shedding 102.

[30] Also, a base 114 secured by using the tape 108 and a connection step portion 113 is engaged at the lower side of the rapier body and the gripper body 111, 112.

[31] Further, a slot 115 having a length L is provided at the front of the base 114 securing the tape 108 so that the rapier 105 and the gripper 106 can cross contact and grip the weft thread 107.

[32] The rapier body and the gripper body 111, 112 are secured to the slot 115 by means of securing means 116 such as a screw or a bolt, so that they can move slidably with regard to the base 114 due to the inertial force produced when the tape 108 moves the rapier 105 and the gripper 106 to the center of the loom and stop. [33] It is preferable to form guides having a ruggedness shape for preventing the separation and allowing the stable slidably movement at the rear side of the slot 115 and at the rear side of the rapier body and the gripper body 111, 112.

[34] A supporting plate 120 is provided to project to one side at the rear of the engaging hook 109 formed at the rapier body and the gripper body 111, 112 respectively, so that the weft thread 107 to be transported can be picked up to the supporting plate in coupled with a gripping header 122 formed at the front of a gripping lever 121 rotatably provided to the rapier body and the gripper body 111, 112.

[35] It is preferable that the connection surface of the supporting plate 120 and the gripping header 122 is formed of a knurling or an inter-engaging rugged shape so that the weft thread 107 can be stably picked up.

[36] Also, an arc shaped projection 123 is respectively formed at the rear of the gripping lever 121 of the rapier body and the gripper body 111, 112, so that the thread can be picked up or unpicked when the inertial force is produced by an actuating projection 125 secured separately to or formed integrally with the base 114.

[37] With regard to the gripping lever 121 engaged with the rapier 105, the weft thread is unpicked from the rapier by the sliding movement of the projection 123 from the upper turning point P to the lower turning point Pl.

[38] With regard to the gripping lever 121 engaged with the gripper 106, the weft thread is picked to the gripper by the sliding movement of the projection 123 from the lower turning point P2 to the upper turning point P3.

[39] The gripping lever 121 is constructed such that a length L2 from the rotation point

H to the projection 123 is longer than a length Ll from the rotation point H to the gripping header 122, so that it can maintain the picking and unpicking conditions before it cross contacts with the thread by means of its self- weight without providing any supporting means.

[40] Also, the head portion 110 of the gripper 106 is provided with an additional double picking means 130 for preventing the separation of the weft thread by regulating the engaging hook 109 of the head portion 110 in addition to the picking of the supporting plate 120 to the gripping header 122.

[41] The double picking means 130 is constructed such that the head portion 110 formed with the engaging hook 109 is secured at the front side of the supporting plate 120 to allow it move freely, and a picking projection 133 is formed at the rear side of the head portion 110 so that the double picking operation can be performed through the pressing of a press projection 132 formed at the gripping header 122.

[42] According to the present invention constructed as described above, the weft thread

107 can be transferred with the reciprocal movement of the rapier 105 and the gripper 106 to the center point from both sides of the shedding 102 of the warp thread 101 by means of the transporting device 103 as was in the conventional operation of the rapier loom 100.

[43] When the rapier 105 and the gripper 106 receive the weft thread 107 by the cross contact at the central point of the shedding 102, it is possible to transfer them more accurately by performing second motion without errors and picking the weft thread 107 to be transferred and the weft thread 107 transferred more completely to thereby prevent the faulty transferring of the weft thread 107.

[44] Hereinafter, a serious operation of the rapier 105 and the gripper 106 will be explained in detail below.

[45] The rapier 105 moves from the left to the center of the shedding 102 formed by the warp thread 101 with being picked by the gripping header 122 of the gripping lever 121, when the weft thread 107 are positioned above the engaging hook 109 and the supporting plate 120 of the head portion 110.

[46] In this instance, the projection 123 formed at the rear side of the gripping lever 121 is positioned at the upper turning point P of the actuating projection 125 formed at the base 114, so that the gripping header 122 contacts closely with the supporting plate 120 to pick the weft thread 107.

[47] Also, the gripper 106 moves to the center of the shedding 102 when the projection

123 of the gripping lever 121 is positioned at the lower turning point P2 behind the actuating projection 125. In this instance, since the length L2 from the rotation point H of the gripping lever 121 to the projection 123 is longer than the length Ll from the rotation point H to the gripping header 122 in addition to the self- weight of the gripping lever 121, the gripping header 122 can move to the open state naturally.

[48] When the rapier 105 and the gripper 106 are positioned at the center of the shedding

102 as described above, an inertial force is produced to make the rapier 105 and the gripper 106 to progress continuously due to the stop of the tape 108 transported by the transporting device 103.

[49] In this instance, the rapier body and the gripper body 111, 112 are moved slidably as far as the cross-contacting area along the slot 115 of the base 114 based on the inertial force, the rapier 105 unpicks the weft thread 107 transported in the cross- contacting area, and the gripper 106 picks the weft thread 107 unpicked from the rapier 105 in order to transport in the opposite direction.

[50] In other words, the rapier body and the gripper body 111, 112 move slidably as far as the cross-contacting area along the slot 115 of the base 114 by means of the inertial force produced from the stop of the tape 108, so that the projection 123 of the gripping lever 121 provided at the rapier 105 moves from the upper turning point P of the actuating projection 125 to the lower turning point Pl to thereby make the gripping header 122 be separated from the supporting plate 102 and opened by means of the self- weight of the gripping lever 121 and the tension of the weft thread 107. [51] Since the gripper 106 is positioned at the cross-contacting position when the rapier

105 is opened, the weft thread 107 becomes to be naturally positioned between the supporting plate 120 of the gripper 106 and the gripping header 122 of the gripping lever 121.

[52] With the opening operation of the rapier 105, the projection 123 of the gripping lever 121 moves from the lower turning point P2 to the upper turning point P3 to make the gripping header 122 of the gripping lever 121 contact with the supporting plate 120 to thereby pick the weft thread 107.

[53] As described above, second operation is accomplished by the double picking means

130 provided at the head portion 110 of the gripper 106 concurrently, when the gripper

106 picks the weft thread 107, to thereby perform the double picking operation so that the weft thread 107 cannot be separated.

[54] To describe it more concretely, when the gripping header 122 becomes to be contacted with the supporting plate 120 by the actuating projection 125, the press projection 132 of the formed integrally with the gripping header 122 becomes to press the picking projection 133 formed at the rear side of the head portion 110.

[55] Then, the front side of the head portion 110 secured to the front side of the supporting plate 120 by means of the hinge pin 131 becomes to rotate in the direction toward the gripping header 122 with centering the hinge pin 131 by means of the pressed picking projection 133 to thereby confine the engaging hook 109 so that it cannot be exposed, to perform the double picking operation.

[56] FIG. 7 is a cross-sectional view showing the gripper of the rapier and gripper for the rapier loom using the inertial force and the weft tension according to another embodiment of the present invention, in which different means for operating the gripping lever 121 is described.

[57] After securing the rapier body and the gripper body 111, 112 to the base 114 fixed to the tape 108 so that they cannot move, the gripping lever 121 can be constructed to operate by a movable member 141 provided at the space 140 formed at the rapier body and the gripper body 111, 112 or at the base 114 so that it can move without being separated.

[58] After performing such concurrent operations of the gripping lever, the rapier 105 and the gripper 106 move in both directions of the shedding 102 by means of the transporting device 103 to accomplish the transportation of one weft thread 107, and weaving of the threads can be accomplished by performing such operation repeatedly.

Claims

[1] In a rapier 105 and gripper 106 for a rapier loom 100 using an inertial force and weft thread tension, in which a warp thread 101 is moved up and down al¬ ternatively to form a shedding 102, and the rapier 105 and the gripper 106 are moved to the middle position from both sides of the warp thread 101 by means of a transporting device 103, so that weaving is accomplished by the gripper's cross-contacting and transferring the weft thread 107 transported by the rapier 105, and repeating the beating operations, the rapier and gripper for the rapier loom are characterized by comprising: a rapier body 111 and a gripper body 112, each of which is formed to be streamlined so that it can easily progress into the shedding 102, and is provided with a head portion 110 formed with an engaging hook 109, each lower side of which is engaged with a base 114 secured by means of a tape 108 and a connection step portion 113; slots 115 formed at the front of the bases 114 to have a length L enough to transfer the weft thread 107 after the rapier 105 and the gripper 106 cross-contact it, and through which the tape and the base are secured to the rapier body 111 and the gripper body 112 by means of securing means 116, so that the rapier body 11 and the gripper body 112 can move slidably with respect to the bases 114 by means of the inertial force produced at the time of stop of the tape 108; and supporting plates 120 formed at the rear side of the engaging hooks 109 formed at the rapier body 11 and the gripper body 112 to project in one side, to which the weft thread 107 to be transported is picked through the cooperation of gripping headers 122 formed at the front side of a gripping levers 121 provided rotatably to the rapier body 111 and the gripper body 112, wherein the projections 123 formed at the rear side of the gripping levers 121 are constructed such that they can be picked to and unpicked from actuating projections 125 formed at the bases 114.

[2] The rapier and gripper according to claim 1, wherein the gripping lever 121 engaged with the rapier 105 is unpicked from the weft thread by the sliding movement of the projection 123 from the upper turning point P to the lower turning point P2; wherein the gripping lever 121 engaged with the gripper 106 is picked to the weft thread by the sliding movement of the projection 123 from the lower turning point P2 to the upper turning point P3; and, wherein the gripping lever 121 is constructed such that a length L2 from the rotation point H to the projection 123 is longer than a length Ll from the rotation point H to the gripping header 122, so that it can maintain the picking and unpicking operations before it cross contacts with the thread by means of its self- weight.

[3] The rapier and gripper according to claim 1, wherein the head portion 110 of the gripper 106 is further provided with double picking means for confining the engaging hook 109 to thereby prevent the weft thread from being separated; wherein the double picking means 130 is constructed such that the head portion

110 is secured to the front side of the supporting plate 120 by means of the hinge pin 131; and wherein the head portion 110 is further provided with a picking projection 133 at the rear side so that it can perform the double picking operation by being pressed by the press projection 132 formed at the gripping header 122.

[4] A rapier 105 and gripper 106 for a rapier loom 100 using an inertial force and weft tension, in which a warp thread 101 is moved up and down alternatively to form a shedding 102, and the rapier 105 and the gripper 106 are moved to the middle position from both sides of the warp thread 101 by means of a transporting device 103, so that weaving is accomplished by the grippe's cross- contacting and transferring the weft thread 107 transported by the rapier 105, and repeating the beating operations, the rapier and gripper for the rapier loom are characterized by comprising: a rapier body 111 and a gripper body 112, each of which is formed to be streamlined so that it can easily progress into the shedding 102, and is provided with a head portion 110 formed with an engaging hook 109, each of which is secured to a base 114 fixed to a tape 108 so that it cannot move; and supporting plates 120 formed to project in one side at the rear side of the engaging hooks 109 formed at the rapier body 11 and the gripper body 112, to which the weft thread 107 to be transported is picked through the cooperation of gripping headers 122 formed at the front side of a gripping levers 121 provided rotatably to the rapier body 111 and the gripper body 112, wherein the projections 123 formed at the rear side of the gripping levers 121 are constructed such that they can be activated by movable members 141 provided in spaces 140 formed at the rapier body 111 and the gripper body 112 or at the bases 114 so that they cannot move.