JP6971916B2 - An improved system for gripping / releasing wefts on projectile looms - Google Patents

Description

The present invention relates to an improved system for gripping / releasing wefts in a projectile loom.

As is known, a projectile loom inserts a weft into a shed by firing a projectile, a tapered metal body of appropriate mass and shape, along a guide track. , Different from other types of looms. The projectile is loaded at the departure station of the guide truck located outside the shuttle, and the weft freedom while the projectile is still located at the departure station prior to the initiation of the launch operation by any known device. The end is attached to the projectile. After the projectile is fired, the projectile passes through the shuttle while pulling the weft, thus obtaining the desired weft insertion.

When exiting the shuttle (usually on the right side of the loom with respect to the standard working position of the weaver), the projectile is decelerated and stopped by a braking device installed at the arrival station of the guide truck located outside the shuttle. Be done. When the projectile stop is complete, the weft is released. The projectile is released from the weft and then returned to the loom's launch side (usually to the left of the loom) by a suitable continuous transfer system. On the launch side, the individual arriving projectiles are stored in the loading device, which progressively brings the projectiles in front of the departure station, where each desired weft is provided by the projectile. Attached to each projectile before being re-launched into the mouth. Of course, a certain number of projectiles operate simultaneously on a particular loom, but that number is essentially determined by the height of the loom and the speed of the continuous transport system returning the projectile from the arrival station to the departure station. ..

Since the weft gripping and releasing operations can only be performed when the projectile is stationary, the weft insertion cycle on a projectile loom takes much longer than on a rapier loom, and therefore this type of weft. The maximum operating frequency of the loom is medium or low, that is, the number of weft insertions per minute is, for example, 300 to 400 times. Thus, in normal weaving applications, projectile looms are now completely replaced by rapier looms, air looms, and water looms, while projectile looms are taller (> 3.50 m) woven or special. It is still competitive today in the weaving of technical woven fabrics made from soft yarn, offering higher performance than other types of looms.

Therefore, the problem to be solved by the present invention is the current state of the projectile loom in order to reduce the time required for the weft insertion cycle to a value equivalent to that of the rapier loom without compromising the related advantages of the projectile loom. It is to improve the mode of operation of the weft gripping and releasing system. As already mentioned, these advantages are basically that the projectile loom does not include mechanical parts that move with the projectile along the shuttle, allowing for large height weaving. This, as well as the weft replacement operation of the rapier loom or air or water without causing serious problems such as peeling, loss of desired orientation, failure or irregularity of replacement in the center of the shuttle, or short wefts due to the unique characteristics of the yarn. It is possible to weave special yarns that cannot be handled correctly in the insertion operation by the flow of pressurized fluid of the loom.

U.S. Pat. No. 3,213,892 discloses a projectile loom, wherein the projectile comprises a clamp lever pivotally supported by the body of the projectile, which temporarily holds the weft. It comprises a clamp nose having a clamping surface that cooperates with a corresponding clamping surface formed on the body of the projectile. The spring keeps the clamp nose firmly pressed into the clamp position. The clamp lever is a projector so that the clamp nose is in the open position as the projectile passes laterally to the weft that is pulled up and down by air force by the suction tube in the vertical direction perpendicular to the projectile path. It is equipped with a control unit having a cam surface protruding from the main body of the projectile on the same side as the clamp nose so as to cooperate with a fixed cam provided immediately downstream of the starting position of the projectile.

U.S. Pat. No. 3,213,892 proposed long ago the idea of using a weft gripping system in a moving projectile rather than a stationary projectile, but still all existing. In the projectile weaving machine, the weft gripping system is used in a stationary projectile. In fact, the system of this disclosure would theoretically be able to conveniently reduce the wasted time for clamping the weft on the insertion side of the loom, but this system presents a significant technical problem with the system. Therefore, it has never been realized in the market. The first drawback is due to the fact that the weft in the clamp region is pulled up and down perpendicular to the trajectory of the projectile's clamp nose. However, properly clamping the weft to a moving projectile has a large impact stress that can obviously damage the weft, as well as the amount of time the weft will stay in the clamp area for the closing operation of the clamp lever. It is practically impossible under these conditions, both because of the fact that it is too short compared to the time required to perform. The second drawback is due to the fact that the action of the fixed cam on the control portion of the clamp lever is not slow enough and therefore the useful life of the projectile may be excessively shortened. On the other hand, it is also possible to make this action more gradual by simply changing the square shape of the fixed cam, i.e. providing the fixed cam with an inlet slope, in this case mechanical interference between the fixed cam and the clamp nose. Is not possible because can easily occur in the initial rotation of the clamp lever.

Therefore, starting from the state of the prior art described above, an object of the present invention is a system for gripping / releasing weft threads in a projectile loom, without causing the drawbacks of the above-mentioned prior art solution. And the release operation can be effectively performed on the moving projectile, thus removing the time length associated with the weft gripping / releasing process on the stationary projectile from the entire time of the weft insertion cycle. Is to provide an improved system that can be used.

Another object of the present invention is the projectile repositioning commonly performed in prior art looms to return the projectile and the wefts attached to the projectile to the correct weaving position after the process of stopping the projectile. The process is also unnecessary.

These objects are achieved by a weft insertion grip / release system in a projectile loom having the features according to claim 1. Further preferred features of this device are set forth in the dependent claims.

Further features and advantages of the improved system for gripping / releasing wefts according to the present invention are presented as examples without limitation of the present invention in any case and are preferred according to the accompanying drawings. Further will be revealed from the following detailed description of the embodiments.
FIG. 3 is a perspective view of a projectile of a system for gripping / releasing the weft of the invention as it travels along a guide track formed by the individual supports and guide elements of the projectile. It is a side view of the apparatus of FIG. 1 in the state which the gripping means is in a closed position. FIG. 3 is a perspective view of the device of FIG. 1 in a state where the gripping means is in the closed position. It is a side view of the projectile of FIG. 1 in the state where the gripping means is in an open position. FIG. 3 is a perspective view of the projectile of FIG. 1 in a state where the gripping means is in the open position. It is a perspective view of the internal element of the projectile of FIG. 1 which performs the operation of grasping and releasing a weft. FIG. 3 is a vertical cross-sectional view of a projectile according to the present invention and a collaborative first fixed slide in a weft gripping step. FIG. 5 is a front view of a projectile with an extended top at the position shown in FIG. 5 and a first fixed slide. FIG. 3 is a vertical cross-sectional view of a second fixed slide collaborating with a projectile according to the present invention in a weft release step. FIG. 7 is a front view of a projectile with an extended top at the position shown in FIG. 7 and a second fixed slide. FIG. 6 is a cross-sectional view of a projectile having a widened top corresponding to a guide track hook. FIG. 9 is a cross-sectional view similar to FIG. 9 of the second embodiment of the projectile.

According to the present invention, in order to solve the above problems, the projectile P accommodates a movable element that performs a weft gripping and releasing operation while the projectile is moving along the guide track. The movable element is moved by a fixed slide placed in an appropriate position along the guide track.

Preferably, the guide track is formed by a plurality of individual supports and guide elements of the projectile P, often simply referred to as hooks G in the art. The hooks G are arranged side by side in a row along the desired trajectory of the projectile P and are fixed to the body of the loom at each base in a manner known per se. Accordingly, the projectile P comprises a suitable sliding surface that cooperates with the corresponding inner surface of the hook G arranged in such a way as to provide restraint on both sides in two directions perpendicular to the sliding direction of the projectile P. Therefore, various aspects of these surfaces are various, with the sole constraint that they are consistent with other functions of the Projectile P described below that allow the weft gripping and releasing actions to be performed on the "moving" projectile. Configurations can be proposed.

In all projectile looms in use today, the attachment of the weft to the projectile is done by a clamp located at the rear end of the projectile. The clamp can be opened from the outside of the projectile by inserting a movable pin that pulls the two arms of the clamp apart against the spring means that pushes these clamp arms to the closed position. Therefore, it is clear that in such a configuration, the weft gripping and releasing operations can only be performed if the projectile is stationary and is accurately positioned with respect to the movable pin described above. .. As a practical matter, the various solutions proposed in the prior art documents mentioned above have never been realized due to their significant inherent shortcomings. In contrast to this aspect of the prior art, the projectile P according to the invention is movable suitable for performing weft gripping and secure clamping and subsequent quick release of the weft while the same projectile P is in motion. Equipped with elements.

This will allow time and time when the projectile is moving just after the projectile is launched, and when the weft has been inserted into the spout but the projectile is still moving in the stop device. With proper position adjustment, it is possible to grip the weft presented to the projectile by the weft presenter and release the weft. Therefore, the improved system for gripping / releasing the weft according to the present invention is static in a stationary projectile before the start and end of the projectile launch process, as occurs in prior art projectile weaving machines. The weft gripping / releasing motion can be completely eliminated, and instead a dynamic weft gripping / releasing motion can be performed at the end of the projectile P firing process and at the beginning of the stopping process.

Thanks to this innovative solution for weft grip / release, the time associated with the static weft grip / release process while the projectile is stationary is dramatically reduced. Therefore, the improved system for gripping / releasing the weft of the present invention enables the production of projectile looms with much higher working speeds than traditional projectile looms.

In addition to the above, the system of the present invention is immediately suitable for use in weft management techniques such as techniques already widely known and well validated for use in rapier looms, and selection and presentation from such techniques. , And the arrangement of cutting equipment, weft management equipment, and ultimately these equipment on the loom can also be borrowed.

Next, when the mechanical structure of the preferred embodiment of the system for gripping / releasing the weft of the present invention is examined in more detail, this system includes two swing levers housed inside the projectile P and two swing levers. Along a guide track suitable for activating the lever to achieve weft grip as the projectile enters the scrotum and to achieve weft release as the projectile P exits the scrotum. It should be noted that it consists of two fixed slides arranged in a row. Two key innovative features clearly distinguish the projectile according to the invention from the projectile disclosed in US Pat. No. 3,213,892, and the apparatus of the invention is disclosed in the prior art described above. Allows it to be implemented effectively in practice as opposed to the device.

The first important feature is that the weft gripping lever is arranged in a projectile so that the control cam portion of the gripping lever projects to a side different from the side where the end of the same gripping lever pops out in the weft gripping process. Regarding the fact that it has been. This innovative configuration allows the fixed control cam that drives the clamp lever to be designed so that the action of opening and closing the lever is loose enough so that the service life of the projectile is not compromised.

The second important feature of the projectile of the present invention is that the method of gripping the presented and waiting weft is actually the end of the grip lever that projects the weft from the projectile as disclosed in the above-mentioned literature. It is related to not being in "active mode" where the portion is hooked directly and then dragged against the clamp surface by the same end. In fact, the inventor of the present invention causes in the weft a local stress that gripping the weft in such a manner irreparably impairs the structure of the weft and makes it impossible to obtain high quality weaving. I was fully aware of the possibility. Therefore, the weft gripping motion in the projectile of the present invention is designed according to a "negative mode", i.e., the weft slides along the top surface of the projectile and then falls into a convenient containment cavity and later in the containment cavity. It is designed according to the aspect of being properly positioned for the clamping action by the end of the gripping lever. Therefore, when the end of the grip lever is in the open position, the end of the grip lever functions only as a guide element to facilitate the entry of the weft into the accommodation cavity. After the weft is properly placed in the containment cavity, the grip lever moves to the closed position and clamps the weft against the fixed contact surface. Therefore, the gripping action on the weft is extremely gentle and there is no possibility of damage to the weft.

FIG. 4 (the main body of the projectile P accommodating these levers is not shown) and FIG. 5 (cross-sectional view) showing the above-mentioned two swing levers in the operating position. As is clearly shown, the first gripping lever 1 is pivotally supported by 2 near the rear end of the body of the projectile P, while the second release lever 3 is located approximately in the center of the projectile P. It is supported by 4 of. Preferably, both levers are arranged such that their respective longitudinal center planes coincide with the longitudinal center planes of the projectile P. As can be seen in more detail below, the gripping lever 1 performs an action of gripping the weft, while the release lever 3 performs an action of releasing the weft from the projectile P. Both levers swing about an axis that is preferably perpendicular to the direction of movement of the projectile P and parallel to the slide surface of the projectile P.

The grip lever 1 is a two-arm lever with a longer front grip arm 1p and a shorter rear return arm 1r, the arms being substantially perpendicular to each other. The lever 1 is held in a closed position to perform a clamping action on the weft by a pair of coil springs M placed in a suitable cylindrical housing formed in the body of the projectile P on both sides of the lever 1. The spring M operates by a compressive force and acts on the free end of the return arm 1r to press the free end 1pe of the gripping arm 1p against the contact plate 5 made of a highly wear-resistant material. The abutment plate 5 is inserted into a suitable seat provided in the projectile P or is integral with the projectile P. As is clearly shown in FIG. 2, when the gripping lever 1 is in the clamp position, that is, when the end portion 1pe of the gripping arm 1p is in contact with the contact plate 5, the outer shape of the gripping arm 1p is as follows. It is completely inside the contour of the projectile P. The body of the projectile P and the end 1pe of the gripping arm 1p of the lever 1 are entangled with warp threads that come into contact with the outer surface of the projectile, especially in the final stage of movement of the projectile when the shuttle is about to be closed. It has a shape that has no potential for catching so that the projectile P can slide freely in the shuttle without causing pulling and / or braking.

The release lever 3 is also a two-arm lever (FIGS. 4 and 5) including a longer front controlled arm 3c and a shorter rear operating arm 3a that are substantially aligned with each other. As shown in FIG. 5, when the gripping lever 1 is open at the weft gripping position, the release lever 3 is not by a permanent magnet 7 disposed inside each housing formed in the body of the projectile P. When the gripping lever 1 is closed at the weft clamp position while being held in the operating position, such gripping lever 1 is adjacent to the free end of the operating arm 3a at site 1p (FIG. 7), but the operating arm. It does not interfere with the free end of 3a. The free end of the controlled arm 3c is divided into two arcuately spaced protrusions 8 of the projectile P when the release lever 3 is in the non-actuated position. It projects from a suitable notch formed in each shelf 9 (FIGS. 2B and 3B). The shelf-shaped portion 9 forms the upper surface of two laterally expanding portions 10 protruding from the lower half of the projectile P over the entire length of the projectile P.

The opening operation of the gripping lever 1 is caused by the contact between the lower portion 1 ps of the gripping arm 1p and the first fixed slide S1 (FIG. 5) provided with the ascending and descending slopes. The first slide S1 was placed in the center of a portion of the guide track of the projectile P at an appropriate position in front of the entrance of the shuttle, and was formed under the projectile P as the projectile P passed. It is located in such a way as to enter the convenient central compartment 6 (FIGS. 6 and 9). Inside the compartment 6, the lower portion 1 ps of the gripping arm 1 p of the lever 1 also protrudes, so that this portion 1 ps is the first slide S1 when the projectile P passes over the first slide S1. Contact with. Unlike the prior art described above, the lower 1 ps of the grip lever 1 that cooperates with the first slide S1 is designed to protrude from the lower side of the projectile P, that is, the free end 1 pe of the same grip lever 1 protrudes. It should be noted that the projectile P is designed to project from a side different from the upper side. With this configuration, the first so as to actually give the gripping lever 1 a rotational motion smoothly as desired without causing any mechanical interference between the slide S1 and the free end 1pe of the gripping lever. The slide S1 can be freely designed. The contact between the rounded lower portion 1 ps of the gripping arm 1p and the ascending slope of the first slide S1, which is schematically shown by the arrow F in FIG. 5, is as shown in FIGS. 3A and 3B. Until the free end 1pe of the gripping arm 1p of the lever 1 protrudes from the main body of the projectile P, a gentle open rotational movement of the lever 1 around the shaft 2 against the action of the spring M is caused. In this way, the free end 1pe of the gripping arm 1p is, on the other hand, lowered by the presentation device to a presentation position located flush with the top surface of the projectile P in a manner known per se in the field of rapier looms. For the weft, a gripping element for the weft is formed.

In practice, as clearly shown in FIGS. 2 and 3, a conveniently shaped weft containment cavity is the free end of the contact surface 5 and the open position grip lever 1 within the body of the projectile P. It is formed between 1pe and 1pe. This weft accommodating cavity is such that the weft that slides to the upper surface of the projectile P is dropped into the projectile P at the best position for clamping operation by the free end 1pe of the gripping lever 1 later. Designed with. Therefore, the gripping lever 1 functions as a guide element for facilitating the smooth entry of the weft into the accommodation cavity when in the open position. The shape of the weft accommodating cavity is not particularly limited to the object of the present invention, and is mainly determined by the inclination of the presented and waiting weft with respect to the projectile trajectory, and the type and count of the weft.

While the projectile P moves forward, the grip lever 1 reaches the downhill slope of the first slide S1 that allows the lower 1 ps of the grip lever 1 to gently and quickly close the lever 1 with respect to the contact surface 5. Until then, the contact with the first slide S1 by the lower 1 ps is maintained. Due to the constant compression action of the spring M on the arm 1r of the lever 1, the weft is firmly clamped in a predetermined position between the free end 1pe of the lever 1 and the contact surface 5. The weft is then cut using techniques and equipment already known in rapier looms, while being drawn into the warp shuttle by the projectile P to achieve the desired weft insertion.

To enable release of the weft yarn when the projectile P has reached the opposite end of the shed, the lever 1 is provided at the front free end of the control arm 3 c release lever 3 1 It is slightly reopened by contact between the pair of protrusions 8 and the second fixed double slide S2 located at an appropriate location outside the shuttle (FIG. 7). The double slide S2 is arranged symmetrically on both sides of the projectile P, particularly above the projectile P, corresponding to the shelf-shaped portion 9 of the projectile P. The second double slide S2 also has an ascending and descending slope that gradually contacts the bow-shaped portion of the upper portion of the protrusion 8 to cause a gentle rotational movement in both rotational directions of the release lever 3.

In the first "opening" motion, the free end of the operating arm 3a of the release lever contacts the lower part of the arm 1p of the lever 1 and thus the end 1pe of this arm 1p is of the spring M to the arm 1r of the lever 1. It is moved away from the abutting plate 5 against the compressive action, allowing the weft to be released (FIG. 7). The rotation provided by the release lever 3 to the arm 1p of the lever 1 is just sufficient to release the weft from the clamping action on the abutting plate 5, but causes the free end 1pe of the arm 1p to protrude from the contour of the projectile P. It is not as large as it is, thus avoiding the possibility of such a free end 1pe interfering with the warp during the possible premature closure of the liver. When the contact between the downward slope of the second double slide S2 and the protrusion 8 of the release lever 3 is completed, this lever is returned to its original position by the attractive force of the magnet 7.

The overall cross-sectional shape of the projectile P, and thus the shape of the inner surface of the hook G, meets the requirements for achieving stable guidance of the projectile P, and the friction as the projectile P moves along the guide track. Considered in a way that minimizes losses. For example, as shown in FIGS. 1 to 3 and 9, it is possible to provide a projectile P having a laterally beveled contact surface that converges towards the top of the projectile and no upper contact surface. It is possible. Alternatively, as shown as an example in FIG. 10, it is possible to use a projectile P having a lateral vertical contact surface and an upper horizontal contact surface. These different shapes of projectiles provide different performance and can be selected according to the needs of the loom using the projectile.

The shelf-shaped portion 9, together with the upper center surface of the projectile P, brakes to stop the projectile at the braking surface of the projectile P when the projectile P exits the slot, that is, at the end of inserting the weft into the slot. Further forms the surface on which the pad of the device acts. If necessary, to limit wear and overheating of the brake pads and the same projectile P due to braking friction to acceptable limits, the upper part of the projectile P with respect to the projectile P shown in FIGS. Braking by increasing the width and providing a lateral overhang 11 that at least partially overlaps the shelf 9 as in the embodiment of the projectile P shown in FIGS. 6, 8, 9, and 10. It is possible to widen the surface.

The special arrangement of the gripping lever 1 and the release lever 3 of the projectile P is such that the lower portion 1 ps of the gripping lever 1 that cooperates with the first slide S1 is arranged near the rear part of the projectile P, and the second slide S2. It is possible to dispose the protrusion 8 at the free end of the release lever 3 that cooperates with the projectile P in the vicinity of the front portion of the projectile P. With this configuration, the weft can be gripped just before the entrance of the shuttle, and the release of the weft is also at the stage where the projectile P crosses the last warp and / or false selvedge located at the exit of the shuttle. Since it can be accelerated, it is possible to minimize unnecessary weft ends coming out of the shuttle on both the entrance side and the exit side of the shuttle. In addition, due to the gradual closure of the shuttle to the projectile P, the warp and / or pseudo-selvedge yarn sufficiently retains the ends of the weft yarn as it is released from the projectile, thus forming a defect-free woven fabric. You can also get help.

However, the present invention should not be considered to be limited to the particular configuration of the above-exemplified embodiment which merely illustrates a typical embodiment of the present invention, and the present invention is defined solely by the following claims. It should be understood that various variants are possible, all within the imagination of one of ordinary skill in the art, without departing from the technical scope.

Claims (15)

The projectile (P) sequentially follows the guide track extending upstream and downstream of the shuttle to the open shuttle of the loom to perform the insertion of the weft attached to the projectile (P). A system for gripping / releasing wefts on a projectile loom in the form of being fired.
Each of the projectiles (P) is provided with a gripping lever (1) pivotally supported to the main body of the projectile (P) by accommodating it inside.
The grip lever (1) is
a. One free end (1pe) of the gripping lever (1) protrudes from the contour of the projectile (P) in order to grip the weft moved near the projectile (P) by the weft presenting device. Weft gripping position and
b. To ensure that the weft is held when the projectile (P) is inserted into the shuttle, the free end (1pe) of the gripping lever (1) is completely inside the contour of the projectile (P). Positionally, it is movable between the projectile (P) and the weft clamp position that abuts on the contact surface (5) integrated with the main body.
The gripping lever (1) is held in a state of being pushed into the weft gripping position by the pushing means (M).
The control unit (1) of the gripping lever (1) in which the opening movement of the gripping lever (1) toward the weft gripping position against the action of the pushing means (M) projects from one side of the projectile (P). 1 ps) and caused by contact between the ascending slope of the first fixed slide (S1) disposed along a portion of the guide track of the projectile (P) prior to the entrance of the lever. The control unit (1 ps) of the grip lever is characterized in that the free end (1 pe) of the grip lever (1) of the projectile (P) protrudes from a side different from the side on which the free end (1 pe) protrudes. A system for gripping / releasing weft threads in a projectile weaving machine. Each of the projectiles (P) further comprises a release lever (3) pivotally supported by the main body of the projectile (P).
The release lever (3) is
a. The home position where the operation arm (3a) of the release lever (3) is adjacent to a part of the grip lever (1), and
b. In order to enable the release of the weft by moving the free end (1pe) of the gripping lever (1) away from the contact surface (5), the operating arm of the release lever (3) ( The free end of 3a) can move between the weft release position that rotates the gripping lever (1) against the action of the pushing means (M).
The rotational movement of the release lever (3) toward the weft release position is a part (8) of the release lever (3) and the guide track of the projectile (P) after the exit of the shuttle. The system for gripping / releasing wefts in a projectile loom according to claim 1, which is caused by contact with an ascending slope of a second fixed slide (S2) arranged along a portion of the loom. The pushing means comprises a pair of coil springs (M) disposed in a suitable cylindrical housing formed in the body of the projectile (P) on both sides of the gripping lever (1). A system for gripping / releasing a weft in the projectile loom according to Item 1 or 2. The gripping lever (1) is a two-arm type lever, and the coil spring (M) acts on the free end of the return arm (1r) of the gripping lever (1) by a compressive force, and the return arm. (1r) is the opposite of the pivot point (2) of the gripping lever (1) with respect to the gripping arm (1p) of the gripping lever (1) that holds the free end (1pe) of the gripping lever (1). The system for gripping / releasing the weft in the projectile weaving machine according to claim 3, which is located on the side. In the projectile loom according to claim 2, the outer shape of the free end (1pe) of the gripping lever (1) is completely inside the contour of the projectile (P) at the weft release position. A system for gripping / releasing. The second aspect of claim 2, wherein the release lever (3) is held in the home position by a return means composed of a permanent magnet (7) arranged in a housing formed in the main body of the projectile (P). A system for gripping / releasing weft threads on a projectile loom. The release lever (3) is a two-arm type lever, the permanent magnet (7) acts on the controlled arm (3c) of the release lever (3), and the controlled arm (3c) is the controlled arm (3c). The projectile weaving machine according to claim 6, which is located on the opposite side of the pivot point (4) of the release lever (3) with respect to the operation arm (3a) of the release lever in contact with the grip lever (1). A system for gripping / releasing the weft. The projectile (P) comprises two laterally expanding portions projecting from the lower half of the projectile over the entire length of the projectile to form a shelf-like portion (9), of the release lever (3). The controlled arm (3c) is divided into two arched projections (8) located at free ends of the arm at intervals from each other, the projections (8) being the release levers (3). Projects from an appropriate notch provided in the shelf-like portion (9) when is in the home position, the projection (8) with the second fixed slide (S2) of the release lever (3). The system for gripping / releasing the weft in the projectile weaving machine according to claim 7, which constitutes the contact surface of the above. The system for gripping / releasing wefts in the projectile loom according to claim 8, wherein the braking surface of the projectile (P) is composed of the upper surface of the projectile and the surface of the shelf-shaped portion (9). .. The weft is gripped in the projectile loom according to claim 9, wherein the upper portion of the projectile (P) is widened by a lateral overhang (11) that at least partially overlaps the shelf-shaped portion (9). / A system for releasing. The projectile (P) comprises a side contact surface that cooperates with the hook (G) of the guide track, and the side contact surface is tilted so as to converge toward the upper part of the projectile. , A system for gripping / releasing a weft in a projectile loom according to any one of claims 1 to 10, which is not provided with an upper contact surface. The projectile according to any one of claims 1 to 11, wherein the projectile (P) includes a vertical side contact surface and a horizontal upper contact surface that cooperate with the hook (G) of the guide track. A system for gripping / releasing weft threads on a loom. The gripping arm (1p) and the return arm of the gripping lever (1) (1r) is perpendicular to each other physician to grip / release the weft yarn in projectile loom according to any one of claims 1 to 12 System for. Said release lever (3) the controlled arm (3c) and the operating arm (3a) are aligned with each other physician, the weft yarn in projectile loom according to claim 2, any one of 5 to 10 A system for gripping / releasing. The lower part (1 ps) of the gripping lever (1) that cooperates with the first fixed slide (S1) and the protrusion of the free end of the release lever (3) that cooperates with the second fixed slide (S2). The grip lever (1) is pivotally supported near the rear end of the projectile (P) and released so that the 8) is located near the rear and front of the projectile (P), respectively. lever (3) is pivoted to the position of the center of the said projectile (P), according to claim 2, 5 to 10, for grasping / releasing the weft in projectile loom according to any one of the 14 System.

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