JP2018115415A - Control lever mechanism of tack-in device of loom with mobile processing head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile head tuck-in device which does not require the use of a cylindrical guide to obtain an alternating translational movement of the mobile head.SOLUTION: A control lever mechanism for a movable head tuck-in device of a loom comprises a first articulated rectangular, an end hinge of the first articulated rectangular is fixed to the loom, the first articulated rectangular receives an alternating translating motion from a slay of the loom, this alternating translating motion is preferably adjusted and transmitted to the terminal lever L2 hinged to one of the end hinge, this terminal lever L2 integrally holds a movable head of the tuck-in device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control lever mechanism for a tuck-in device of a weaving machine, and more particularly to a control lever mechanism for a tuck-in device in which a machining head is movable alternately in the warp direction during each weft insertion cycle.

  A device for the formation of an ear (selvedge), that is, a device called “tack-in device” in the art, consists of a mechanical, electrical, pneumatic device, or a combination of these, In a loom, false ears (defined in this way for true ears formed in a barbed loom) are formed along the side edges of the fabric being weaved, and after weft insertion and cutting operations, from the fabric Used to firmly fix the weft end protruding to the side.

  This is the processing head of the tuck-in device, immediately after the shed is closed and beaten against the weft by various possible mechanical, electrical, pneumatic or combined operating modes. The weft end of the last weft inserted, grasping the free end of the weft and immediately reinserting it into the shed, thus leading to both closure of the shed and beating on the next weft As such, it is permanently held at the position between the warp yarns along the subsequent weft, thus allowing the formation of ears instead of free fringes at the weft end, during subsequent fabric processing and manipulation This is achieved by a processing head with considerable advantages in terms of the stability and strength of the fabric edge.

  Tuck-in devices are more often equipped with fixed processing heads and are positioned on both sides of the fabric to be machined alongside the folds. Since one or more fabrics of reduced width are often weaved simultaneously across the entire width of the loom, a tuck-in device with a stationary processing head can be positioned in the loom shed to allow positioning. Of course, it is necessary to shorten or divide into two or more parts. Otherwise, there will be mechanical interference between the kite and the tack-in device during the kite operation.

  A tack-in device with a mobile processing head (hereinafter also referred to simply as a “mobile head tack-in device”) is provided with an alternating motion in the direction of the warp and the rear of the processing head during the beating step. This problem is solved by allowing movement and subsequent rapid forward movement of the machining head in the immediately following step. Thus, it is possible to operate these tuck-in devices with the entire heel, i.e. regardless of the size of the fabric and the number processed simultaneously on the loom, with the heel extending across the entire width of the loom.

  For example, Patent Document 1, Patent Document 2, and Patent Document 3 disclose fixed head tack-in devices having various structures and drive systems.

  In addition, although not patented, a mobile head tack-in device manufactured by SULTEX AG is well known in the art. In this apparatus, the operation of the processing head of the tack-in apparatus that is movable on the linear sliding guide is drawn from the main operation of the loom (and particularly the operation of the sley) by a link mechanism including an articulated quadrilateral and a cam. The cam was suitable to provide the desired law of motion for the mobile head of the tack-in device.

  In addition, the movable head of the tuck-in device disclosed in the above-mentioned patent is integrated with the weft cutting device according to a conventionally known configuration, and at a selected time after insertion of the weft into the shed, In order to make the cut, the head of the tuck-in device is followed in alternating longitudinal movements. The control of the cutting device is independent of the control of the movable head of the tack-in device, and is usually performed by a pneumatic or electric device.

  Finally, U.S. Patent No. 6,057,051 discloses a method of forming an ear in which a mobile tuck-in device is integrally fixed to a heel and thereby moves in synchronization with the heel. While this solution has a simple and compact structure, it is a major disadvantage because the endurance time given to the tuck-in device is too short in an area useful for grasping the weft end and reinserting it into the shed. Have Therefore, this operation cannot be performed correctly and ear formation becomes irregular.

European Patent Application Publication No. 0286443 U.S. Pat. No. 4,905,740 US Patent Application Publication No. 2006/0207676 European Patent No. 2176455

  The technical solution disclosed by the mobile head tuck-in device from Sultex, briefly described above, still gives the best textile results, i.e. allows the formation of good quality ears, The present invention has several mechanical disadvantages that it intends to overcome.

  The first limiting point of the control of the mobile head of the tack-in device shown above lies in a linear guide on which the mobile head of the tack-in device slides. These guides are, in fact, lubrication systems to provide constant performance and sufficient life to prevent the appearance of wear very early and avoid the formation of clearances that reduce the reliability of the equipment. Or, it is a delicate part that requires at least regular greasing work.

  The second limit can be seen in the cam system itself and relates to the need to provide proper lubrication or at least regular lubrication of the cam follower. In addition, such cam followers pose significant reliability problems in this type of application.

  Finally, the third drawback relates to the essential configuration for controlling the weft cutter separately. Indeed, pneumatic cutting devices have a response delay problem that complicates handling. Electrical servo controllers with fully satisfactory functions are still expensive and demanded from a hardware and software implementation point of view.

  Accordingly, a first object of the present invention is to provide a mobile head tack-in device with a newly devised control device that does not require the use of cylindrical guides to obtain alternating translation of the mobile head. That is.

  A second object of the present invention is to eliminate systems that involve the use of any cam system to cause alternating movement of the mobile head.

  Finally, a further additional object of the present invention is to provide a tuck-in device that can perform a weft cutting operation without the use of pneumatic or electrical actuators to achieve a simpler and more cost effective structure. It is to be.

  All of these objects are achieved according to the invention by a control lever mechanism of a loom mobile head tack-in device having the features of claim 1. Other preferred features of this control lever mechanism of the mobile head tack-in device are defined in the dependent claims.

  Further features and advantages of the control lever mechanism of the tuck-in device according to the present invention are in any case a preferred embodiment of the control lever mechanism which is given merely as a non-limiting example and is shown in the accompanying drawings. Will become more apparent from the following detailed description.

It is a schematic perspective view of the lever mechanism of this invention seen from the right side of the loom. It is a schematic perspective view of the lever mechanism of FIG. 1 seen from the left side of the loom. FIG. 3 is a schematic front view of the lever mechanism of the present invention viewed from the right side of the loom and the sley of the loom that the lever mechanism receives motion, and at this time, the sley (and the heel attached to the sley) is in the position where the weft is beaten. Yes, therefore, the mobile head of the tack-in device is in a fully advanced position. FIG. 4 is a view similar to FIG. 3 when the mobile head of the slay and tack-in device is in a fully retracted position and aligns the mobile head with the newly introduced weft. It is the same figure as FIG. 4 seen from the left side of the loom. It is the same figure as FIG. 3 seen from the left side of the loom.

  In the following description, the terms “forward” and “advance” are always intended to refer to the advance direction of the fabric in the loom, corresponding to the beating operation of the rivet. The terms “back” and “back” naturally refer to the opposite direction. The right and left sides of the loom are based on the position normally occupied by the weaver, that is, the position facing the side from which the fabric during weaving of the loom emerges.

  In the first embodiment, the control lever mechanism of the tuck-in device according to the present invention includes the first articulated quadrilateral Q1 in order to achieve the first and second objects emphasized above. The end hinges 1 and 2 (FIG. 5) are integral with the loom, and the first articulated quadrilateral Q1 receives alternating motion from the loom slay S. In fact, the slay S forms a first lever of an articulated quadrilateral Q1, which includes a short forward transmission connecting rod L1 and a long end lever L2, which is a tuck-in. It is hinged to an end hinge 2 that is integral with the body C of the device. Accordingly, the articulated quadrilateral Q1 connects the two hinges 1 and 2 fixed to the loom and the connecting rod L1 to the sley S via the fork support 5 and to the end lever L2. Two movable hinges 3 and 4 are provided. The fork support 5 can slide on a guide rail integral with the sley S in a manner known per se and can be fixed at any desired position along the guide rail.

  According to the main feature of the present invention, the movable head T of the tack-in device is integrated with the lever L2 at approximately the center position of the lever L2. Thus, the first articulated quadrilateral Q1 has the function of receiving motion from the sley S and causes rotation of the lever L2 at the hinge 2 through the connecting rod L1, resulting in alternating motion of the mobile head T. . Therefore, such a movement of the tuck-in device is performed along an arc having a center at the hinge 2.

  For space reasons, the lever L2 extends towards the top of the loom so that a tuck-in device is placed on each guide rail, one fixed to the loom and the other integral with the sley S. Making positioning easier and faster. However, this configuration is not essential. That is, depending on the space existing in the loom, the end lever L2 can be deployed in other directions. As described above, the lever L2 has a considerable length. Preferably, this length is equal to or greater than the length of the lever formed by the sley S, and precisely the length of the portion of the sley between the hinge 1 and the hinge 3. For this reason, the movement of the mobile head T of the tack-in device takes place along an arc that is wide enough to make a sufficient approximation of the linear motion typical of known guided mobile head tack-in devices. Thus, the lever mechanism described above replaces the cylindrical guide of such known devices, with obvious simplification and dramatic reduction in maintenance intervention.

  All of the levers 2, 3, and 4 of the lever mechanism are preferably provided with double bearings, which facilitates easy centering of the lever mechanism when positioning the tack-in device on the loom, and also the loom It is possible to move the lever L2 holding the movable head T during the movement without clearance.

  With the configuration shown above, the stroke of the mobile head T of the tuck-in device is greater than the stroke length of the heel P fixed to the top of the sley, depending on the different distances from the respective rotation centers of these two devices. Also has a much shorter length. By carefully designing the length of the connecting rod L1, the length and shape of the end lever L2, and the position of the mobile head of the tack-in device at the end lever L2, sufficient to avoid any interference with the heel, It is possible to obtain a forward movement (FIGS. 3 and 6) of the mobile head T during striking, while during the rearward movement of the sley S, the mobile head T is much more limited to the spear P. Running (FIGS. 4 and 5), so that it stays for a longer time in the area useful for ear formation, i.e., at the weft insertion point. Furthermore, the configuration of the levers L1 and L2 is such that these levers, or more precisely the parts connecting their respective centers of rotation, are approximately perpendicular to each other when striking the heel P on the weft, thereby At the start of rearward movement of the kite P, the mobile head T reaches the maximum speed, and then decelerates when approaching an area where tuck-in can be performed effectively.

  Due to the movement of the articulated quadrilateral Q1, the movement of the sley S is preferably adjusted and, more precisely, the reduced travel length, the reduced average speed, the proximity of the mobile head T to the region and It is transmitted to the mobile head T with a relative dwell time in the tuck-in process area that is longer than the travel time.

  In the first embodiment of the control lever mechanism of the present invention, as described above, the weft cutting is performed by the electric servo control device M integrated with the main body C of the tack-in device. The electric servo control device M operates the lever 6 to control the cutting device adjacent to the movable head T of the tack-in device.

  Although not shown in the figure, in the second embodiment of the control lever mechanism of the present invention, there is no electric servo control device M, and the operation of the cutting device is instead of the first articulated quadrilateral. Operated by a second articulated quadrilateral that receives movement from lever L2. This is similar to that disclosed in European Patent Application No. 3073003 by the same applicant, the contents of which are hereby incorporated by reference. In this way, the third object of the present invention can also be achieved.

  However, the present invention should not be construed as limited to the particular configurations described above, but merely illustrates exemplary embodiments of the invention and is defined only by the appended claims. It will be understood that all different variations within the scope of the ability of the person skilled in the art are possible without departing from the scope of the invention itself.

Claims (11)

  A control lever mechanism for a mobile head (T) tuck-in device of a loom comprising an articulated link mechanism (5, L1, L2) connected to a fixing point (2) of the loom and a slay (S) of the loom The control lever mechanism is characterized in that the movable head (T) of the tuck-in device is integrally held by a member of the link mechanism (5, L1, L2).   The link mechanism includes a first articulated quadrangle (Q1), and end hinges (1, 2) of the first articulated quadrangle (Q1) are fixed to the loom, and the first An articulated quadrilateral (Q1) receives the alternating motion from the loom slay (S) and is hinged to one of the end hinges (2) with the alternating motion suitably adjusted. The lobe mobile head (1) according to claim 1, wherein the end lever (L2) is integrally held by the mobile head (T) of the tack-in device. T) Control lever mechanism of the tuck-in device.   The control lever mechanism for a tuck-in device according to claim 2, wherein the articulated quadrilateral (Q1) includes the sley (S), a forward transmission connecting rod (L1), and the end lever (L2).   The tuck-in device according to claim 3, wherein the forward transmission connecting rod (L1) is hinged to the sley (S) and the end lever (L2) by two movable hinges (3, 4), respectively. Control lever mechanism.   The front transmission connecting rod (L1) has a short length and is hinged to the fork support (5) by the movable hinge (3). The fork support (5) is connected to the sley (S). The control lever mechanism of the tuck-in device according to claim 4, which can be fixed at an adjustable position along the integral guide rail.   The end lever (L2) is equal to or greater than the distance between the fixed hinge (1) of the sley (S) and the movable hinge (3) integral with the slay (S). The control lever mechanism of the tuck-in device according to claim 5, which has a length.   The forward transmission connecting rod (L1) and the end lever (L2), or more specifically, the portion connecting the respective rotation centers of the lever, are used when the rod (P) is beaten. The control lever mechanism of the tuck-in device according to claim 6, wherein the control lever mechanisms are approximately perpendicular to each other.   The fixed hinge (2) of the end lever (L2) is arranged above the movable hinge (4) connecting the lever (L2) to the forward transmission connecting rod (L1). Control lever mechanism for tuck-in devices.   An electric servo control device (M) integrated with the fixed body (C) of the tack-in device is further provided for the operation of the cutting device integrated with the movable head (T) of the tack-in device. A control lever mechanism for a tuck-in device according to any one of claims 1 to 8.   A second articulated quadrilateral that receives movement from the first articulated quadrilateral (Q1) and controls the operation of the cutting device integrated with the mobile head (T) of the tack-in device; The control lever mechanism for a tuck-in device according to any one of claims 1 to 9, further comprising:   The control lever mechanism for a tuck-in device according to any one of claims 1 to 10, wherein the hinge on which the end lever (L2) and the front transmission connecting rod (L1) pivot includes a double row bearing.