EP0498773A1

EP0498773A1 - Weft insertion control apparatus in a jet loom

Info

Publication number: EP0498773A1
Application number: EP92810074A
Authority: EP
Inventors: Yoichi c/o Kabushiki Kaisha Toyoda Makino
Original assignee: Toyoda Jidoshokki Seisakusho KK; Toyoda Automatic Loom Works Ltd
Current assignee: Toyota Industries Corp
Priority date: 1991-02-05
Filing date: 1992-02-03
Publication date: 1992-08-12
Also published as: JPH04257347A; JP2596231B2

Abstract

To accomplish successful weft insertion controlling on the basis of information of weft insertion failure due to weft interception by a warp sheet and to reduce consumption of air under pressure used for weft insertion.

If a weft fails to be inserted through a warp shed properly, insertion of a weft portion (Y₂) succeeding the faulty weft (Y₁, Y₃ or Y₄) is prevented by air flow injected by the blow nozzle (18). The succeeding weft portion (Y₂) is introduced into the weft introducing duct (19) by the air flow from the blow nozzle (18) and the faulty weft (Y₁, Y₃ or Y₄) is pulled out from the warp shed by the withdrawing action of the paired rollers (26, 27). Different extending conditions of the faulty weft (Y₁), which has failed to reach the extreme end of weft insertion passage, and of the faulty wefts (Y₃, Y₄) in the region adjacent the inlet of the weft introducing duct (19) are distinguishably detected by the intercepted-weft detector (28). According to the information of detection by the detector (28), the computer control (C₁) changes the setting of commencement times of energization of the solenoid (2) and of the solenoid for valve (V₁), hence the weft insertion commencement time.

Description

The present invention relates a weft insertion control apparatus in a jet loom wherein a weft is inserted into a warpshed by air jet injected form a main weft inserting nozzle.
The time at which insertion of a weft injected by a main weft inserting nozzle of a jet loom just commences is one of the factors that influence the success in weft insertion through a shed. In a jet loom equipped with a weft measuring and storage device of winding type, by which a predetermined length of weft is measured by being wound round a weft winding surface and reserved on the winding surface before the measured weft is released, the weft insertion commencement time is determined by the time at which a weft stop pin of the weft measuring and storage device is just disengaged from the weft winding surface to allow the weft to be released therefrom. As the stop pin is driven to move into and away from engagement with the winding surface by an electromagnetic solenoid, it is possible to change the weft insertion commencement time as desired by controlling the time at which energization of the solenoid just commences.
The weft insertion commencement time is also influenced by the time at which air injection by the main weft inserting nozzle just commences. Thus, the weft insertion commence time can be established by setting the commencement time of weft releasing by the stop pin in conjunction with the commencement time of air injection by the main weft inserting nozzle. The setup adjustment for the weft insertion commencement time is usually made manually and, therefore, the procedure for such adjustment is very troublesome and time-consuming. To be more specific, if the weft insertion commencement time is adjusted so as to advance, the weft insertion may take place when a warp shed is opened only insufficiently, so that a weft inserted into the shed may interfere with a warp sheet by being intercepted by a few number of warps in the sheet delayed in forming a desired shed, thereby causing a failure in weft insertion through the shed. Such interception of inserted weft by a warp sheet tends to occur in the region adjacent the entrance of a warp shed on the side of the main weft inserting nozzle.
Weft interception may be avoided by adjustment to retard the weft insertion commencement time, but, in such time setting, the weft must be flown faster through the shed so that it can complete the insertion in time. To insert a weft through a shed in a shorter period of time, air injection pressure of the weft inserting nozzle must be increased, which will inevitably increase air consumption.
Publication of Unexamined Japanese Patent Application No. 1-192850 (1989) discloses a method according to which actual shed opening is detected by a shed sensor and the weft insertion commencement time for each weft filling is controlled in response to the detected shed opening.
However, this shed sensor is adapted only to detect the opening at a specific region of warp shed and hence unable to detect a delay in shed opening of a few number of warp yarns. Thus, this method cannot provide successful weft insertion commencement time controlling that is capable of preventing the above-described weft insertion failure due to weft interception by a warp sheet.
Therefore, it is an object of the present invention to provide a weft insertion control apparatus adapted for use in a jet loom for automatically controlling the weft insertion commencement time with prevention of the weft interception by warp sheet taken into consideration.
To achieve the above object, the present invention provides a weft insertion control apparatus in a jet loom comprising weft insertion commencement time regulating means adapted to be electrically switchable between the weft releasing condition wherein a weft is allowed to be inserted and the weft release stop condition wherein the weft is kept from being inserted, for regulating the time at which each weft insertion is commenced, detector means for detecting a faulty weft which has failed to be inserted properly through a warp shed by being intercepted by a warp sheet at a region adjacent the entrance of the warp shed, and control means for controlling the switching operation of said weft insertion commencement time regulating means according to weft insertion commencement time setting, said control means having a function of changing said weft insertion commencement time setting according to information of detection by said sensor means.
Weft insertion commencement time regulating means in a jet loom having a weft measuring and storage device of winding type is comprised of an electromagnetically switchable valve connected to a main weft inserting nozzle and an electrically drivable weft stop pin. In a jet loom equipped with a weft measuring and storage device of air pool type, the weft insertion commencement time regulating means is comprised of an electromagnetically switchable valve connected to a main weft inserting nozzle and an electrically drivable weft gripper. If a weft interception occurs, the loom is stopped and the control means changes the setting of weft insertion commencement time according to the information from the detector means. The changed setting of weft insertion commencement time is used for controlling the weft insertion after loom operation is resumed and, therefore, the weft insertion commencement time regulating means is actuated for switching operation according to the changed time setting.
The following will describe an embodiment of the weft insertion control apparatus according to the present invention with reference to the accompanying drawings including FIGS. 1 to 16.

FIG. 1 is a schematic diagram of combination of a weft inserting apparatus and a weft insertion control circuit, showing a front view of an embodiment of the weft insertion controlling apparatus according to the invention;
FIG. 2 is an enlarged front view showing different conditions of weft insertion failure including a failure caused by weft interception by a warp sheet;
FIG. 3 is first part of flow chart showing the weft insertion control program in the first embodiment; [FIG. 4] is second part of the flow chart of the weft insertion control program in the first embodiment;
FIG. 5 is third part of the flow chart of the weft insertion control program in the first embodiment;
FIG. 6 is first part of flow chart showing the weft insertion control program in the second embodiment;
FIG. 7 is second part of the flow chart of the weft insertion control program in the second embodiment;
FIG. 8 is third part of the flow chart of the weft insertion control program in the second embodiment;
FIG. 9 is first part of flow chart showing the weft insertion control program in the third embodiment;
FIG. 10 is second part of the flow chart of the weft insertion control program in the third embodiment;
FIG. 11 is third part of the flow chart of the weft insertion control program in the third embodiment;
FIG. 12 is fourth part of the flow chart of the weft insertion control program in the third embodiment;
FIG. 13 is fifth part of the flow chart of the weft insertion control program in the third embodiment;
FIG. 14 is sixth part of the flow chart of the weft insertion control program in the third embodiment;
FIG. 15 is a schematic diagram of combination of a weft inserting apparatus and a weft insertion control circuit, showing a modified intercepted-weft detector according to the invention; and
FIG. 16 is a graph illustrating different conditions of weft flying.

Reference numeral 1 designates a weft measuring and storage device of winding type in a jet loom. Formation of windings of reserve weft on a weft winding surface 1a of the weft measuring and storage device 1 and releasing of the reserve weft is controlled by a stop pin 2a which is actuated by an electromagnetically-operated solenoid 2 to move into and away from engagement with the winding surface 1a. Energization/deenergization of the solenoid 2 is controlled by commands from a computer control C₁ according to the information of detection from a weft release detector 3. The computer control C₁ also controls the operation of a winding motor 31 for driving a weft winding tube 1a for winding a weft round the surface 1a of the weft measuring and storage device 1.
A weft Y released from the weft winding surface 1a and flown through a main weft inserting nozzle 4 by air jet therefrom is assisted in flying through a warp shed by relayed air jets issued from a plurality of auxiliary nozzles 5, 6, 7, 8. If the weft insertion is done properly, the leading end of the inserted weft Y is detected within a predetermined range of rotational angle of the weaving loom by a weft sensor 9 disposed at the terminating end of weft insertion passage across the loom. A signal representative of presence or absence of such detected leading end of the weft Y is transmitted from the weft sensor 9 to the computer control C₁, which in turn commands the loom to continue or to interrupt its weaving operation according to the signal from the weft sensor 9. When the weft insertion has taken place properly, the computer control C₁ commands a loom drive motor 33 to continue its operation and an electromagnetically-operated weft cutter 30 to make a complete cutting stroke. If the weft has failed to be inserted through the shed properly, on the other hand, the loom drive motor 33 is stopped and the weft cutter 30 is rendered inactive immediately, so that the faulty weft Y₁ (or Y₃, Y₄) that has failed to reach the position defined by the weft sensor 9 is maintained as it is without being cut off by the cutter 30 from its succeeding portion Y₂ of weft.
Injection of air from the main weft inserting nozzle 4 is controlled by a solenoid-operated valve V₁, while injection of air from the auxiliary weft inserting nozzles 5-8 is controlled by similar solenoid-operated valves V₂, V₃, V₄, V₅. To be more specific, air injection from each nozzle takes place when the solenoid of its associated valve is being energized, or turned on, thereby opening the valve, and the air injection is stopped when the same solenoid is deenergized, or turned off, thereby closing the valve. The valve V1 is connected to an air tank 10 for holding therein air under pressure and supplying the air to the valve
The valves V₂-V₅ are connected to a common air tank 11 for holding air under pressure and supplying the air to the respective valves V₂-V₅. These air tanks 10, 11 are in turn connected to a main air tank 14 for holding therein source air under pressure via electrically-operated air pressure control valves 12, 13, respectively, for controlling the air pressures in the respective air tanks 10, 11, hence the air injection pressures of the main and auxiliary weft inserting nozzles 4 and 5-8.
The solenoid-operated valves V₁-V₅ are actuated to open or close according to a command from the control C₁ which provides such command in response to signals transmitted from a rotary encoder 15 monitoring the current angle of rotation of the weaving loom.
There are provided pressure detectors 16, 17 which are connected at their input to the air tanks 10, 11, respectively, for detecting the air pressures in the tanks, and at their output to a computer control C₂ for transmitting thereto information of detected air pressures. The control C₂ thus provides a feedback control of the pressure control valves 12, 13 with the aid of the information of the current air pressures detected by the pressure detectors 16, 17.
Immediately below the outlet of the main weft inserting nozzle 4 is disposed a blow nozzle 18 and immediately above the outlet is located a weft introducing duct 19 whose inlet is positioned in facing relation to the outlet of the blow nozzle 18. Adjacent the exit of the weft introducing duct 19 is provided an air guide 20 having therein a weft sensor 21 of photoelectric transmission type. A suction pipe 22 is arranged adjacently to the exit of the air guide 20. The suction pipe 22 is bent in such a way that its outlet is presented toward a trash box (not shown), and a blow nozzle 23 is connected to the suction pipe 22 at its bent portion for producing air flow in the suction pipe toward the trash box (not shown).
The main weft picking nozzle 4, blow nozzle 18, weftintroducing duct 19, air guide 20 and suction pipe 22 are all mounted on a slay of the loom for swinging movement therewith. A motor 24 is mounted behind the swinging area of these parts 4, 18, 19, 20, 22, and an air cylinder 25 is provided above this motor 24. A drive roller 26 is operatively connected to the motor 24 to be driven thereby, while a follower roller 27 is mounted to a drive rod extending from the air cylinder 25 so that extending motion of the cylinder causes the follower roller 27 to be brought into contact engagement with its associated drive roller 26. The blow nozzles 18, 23 and the air cylinder 25 are connected to a suitable air supply tank (not shown) via solenoid-operated valves V₆, V₇, V₈, respectively. Operation of the valves V₆-V₈ and the motor 24 is controlled by commands transmitted from a computer control C₃.
An intercepted-weft detector 28 of image sensor type is provided behind the region between the outlet of the blow nozzle 18 and the inlet of the weft introducing duct 19. This intercepted-weft detector 28 is adapted to detect and recognize the extending condition of a faulty weft Y₁, Y₃ or Y₄ in the region adjacent the inlet of the weft introducing duct 19 while the faulty weft is being withdrawn for removal from the cloth fell of a woven fabric, and also to provide to the computer control C₁ the information of detection accordingly. Each occurrence of weft interception is counted by the control C₁ and the information of such counted weft interceptions is used by the control C₁ in performing its weft insertion controlling in accordance with a control program represented by the flow chart in FIGS. 3 to 5.
The computer control C₁ has stored therein data of initial setting of weft release commencement times T_p, T_m and data of the upper and lower permissible limits of such commencement times. The weft release commencement time T_p refers to a time at which energization of the solenoid 2 just commences, and the other weft release commencement time T_m to a time at which energization of the solenoid for valve V₁ just commences, respectively. The former commencement time T_p is set slightly later than the latter commencement time T_m.
The computer control C₁ has connected thereto an initializing switch 29 which, when turned on, causes the control C₁ to set the weft release commencement times T_p, T_m to the initial default time setting for controlling the operation of the solenoid 2 and the solenoid for valve V₁. This switch 29 is used when a warp beam is replaced with a new one.
In the event that the leading end of an inserted weft has failed to reach the position of the weft sensor 9 and, therefore, failed to be detected by the weft sensor, the computer control C₁ transmits commands to render the solenoid 2, the solenoids for valves V₁-V₅ and the electromagnetic cutter 30 inactive and also to stop the winding motor 31 and the loom motor 33.
Simultaneously, the computer control C₃ commands the solenoid for valve V₆ to be energized for a predetermined period of time thereby to allow the blow nozzle 18 to inject air for the same period of time. Air flow produced by the blow nozzle 18 serves to prevent a weft portion succeeding the faulty weft from being inserted into the warp shed. As shown in FIG. 2, the weft portion
that succeeds the faulty weft Y₁ (or Y₃, Y₄) is blown into the weft introducing duct 19 and moved therethrough toward the nip region between the paired rollers 26, 27. As the weft portion Y₂ moving past this nip region enters the air guide 20, it is detected by the weft sensor 21.
If no such weft portion Y₂ is then detected by the weft sensor 21, however, an alarming device 32 is activated for warning.
Commands to stop of the loom motor 33 and the winding motor 31 and to render the solenoid 2 inactive are provided substantially simultaneously with the command to energize the solenoid for valve V₆, and the prevention of weft insertion by the blow nozzle 18 is effected while the loom is being rotated by inertia before it is stopped completely. The loom is brought to a complete stop at a position immediately before its beating-up position. Thereafter, the motor 33 is driven to rotate at a slow rate in reverse direction until a wide-open shed is formed by warp sheets T. Thus, withdrawal of the faulty weft from the cloth fell of a woven fabric is made possible.
As the computer control C₃ receives a weft-detected signal from the weft sensor 21, the solenoids for valves V₇, V₈ are energized thereby to activate the blow nozzle 23 and to move the follower roller 27 into contact engagement with its associated drive roller 26 with the weft portion Y₂ nipped therebetween. Subsequently the computer control C₃ commands the motor 24 to be activated. The weft portion
is pulled out by the rotating paired rollers 26, 27 and, therefore, its preceding faulty weft Y₁ (or Y₃, Y₄) beaten up to the cloth fell W₁ is removed therefrom and drawn out from the warp shed.
When the entirety of the faulty weft Y₁ (Y₃, Y₄) is moved past the air guide 20, the control Cs then responding to a noweft detected signal from the weft sensor 21 commands the motor 24 to be stopped and the solenoids for valves V₇, V₈ to be deenergized, respectively.
It is noted that failure in weft insertion includes different situations, as shown in FIG. 2, in which the faulty weft Y₁ is shown as a weft that has failed to reach the extreme end defined by the weft sensor 9 in spite that it could be inserted into a shed properly, and the faulty weft Y₃ (or Y₄) represents a weft that has been caught or intercepted by either warp sheet at a region adjacent the entrance of the shed without being inserted therethrough.
In case of the failure of a weft to reach the extreme end, the faulty weft Y₁ when pulled back by the paired rollers 26, 27 extends along a straight line as indicated by a solid line in FIG. 2. The faulty weft Y₃ shows a condition in which the weft has been intercepted by a few number of warps T₁₁ of upper warp sheet T₁ which had delayed in opening a shed. In such a case, the faulty weft Y₃ extends above the line of the weft Y₁ at a region adjacent the inlet of the weft introducing duct 19 as indicated by the upper phantom line. The faulty weft Y₄ shows a condition in which the weft has been intercepted by a few number of warps T₂₁ of lower warp sheet T₂ which had delayed in shed opening, in which case the weft Y₄ extends below the line of the weft Y₁ in the region adjacent the inlet of the weft introducing duct 19 as shown by the lower phantom line.
These different conditions of the faulty wefts Y₁, Y₃, Y₄ can be detected distinguishably from one another by the intercepted-weft detector 28. Each time weft interception, either Y₃ or Y₄, takes place, the detector 28 transmits information of such insertion failure to the computer control C₁, which then counts the number "n" of such weft interception.
When a predetermined period of time H₁ has elapsed after initialization of the weft release commencement times T_p, T_m, the control C₁ compares the counted number "n" with a predetermined number "N". If the counted number "n" is then equal to or greater than "N", the control C₁ changes the setting of weft release commencement times T_p, T_m to (T_p+ΔT_p), (T_m+ΔT_m), respectively. With this new time setting, the control
controls the weft insertion with (T_p+ΔT_p) and (T_m+ΔT_m) as the commencement times at which enegization of the solenoid 2 for the stop pin 2a and of the solenoid for valve V₁ for the main weft inserting nozzle 4 just commences, respectively. This time setting (T_p+ΔT_p), (T_m+ΔT_m) retards the weft insertion commencement time. Because the warp shed can be opened wider with (T_p+ΔT_p), (T_m+ΔT_m) than with the previous initial setting by a magnitude corresponding to the delay of the weft release commencement times, the tendency of occurrence of weft interception by a few number of warps due to delayed warp shed opening can be reduced.
If the counted number "n" is smaller than "N" after the elapse of time H₁ and also if the weft release commencement time setting T_p, T_m had not ever been changed to advance, the control C₁ changes the weft release commencement time setting T_p, T_m to (T_p-ΔT_p), (T_m - ΔT_m), respectively. This change of time setting advances the commencement times of energization of the solenoid 2 and the solenoid for valve V₁, thus advancing the weft insertion commencement time. Accordingly, the time allowance is increased for the weft to reach the extreme end at the weft sensor 9 by a predetermined time, with the result that the air injection pressure of the main weft inserting nozzle 4 and auxiliary weft inserting nozzles 5-8 can be reduced and, therefore, consumption of air necessary for weft insertion can be reduced.
After changing the time setting T_p, T_m, the computer control C₂ changes the setting of pressures P_m, P_s in the air supply tank 10, 11, respectively. These air pressures P_m, P_s influence the time at which the leading end of an inserted weft reaches the position at the weft sensor 9. Additionally, the control C₁ changes the setting of times [Asi, Bsì] of energizing and deenergizing the solenoids for valves V₂-V₅. "Asi" refers to a time at which energization of each of the solenoids for valves V₁ just commences and "Bsi" to a time of deenergizing each of the same solenoids (wherein i=2-5).
Unless the initializing switch 29 is turned on in restarting the loom after a time setting change, the control C₁ uses the weft release commencement times (T_p+ΔT_p), (T_m+ΔT_m) or (T_p-ΔT_p), (T_m-ΔT_m) in performing the weft insertion controlling.
If weft interception occurs frequently with a previous setting of advanced T_p, T_m, the counted number "n" is reset and the counting is started again without changing the settings of the weft-release commencement times, air pressures P_m, P_s and solenoid energize/deenergize times [Asi, Bsi].
In the above weft insertion controlling according to the present invention, the occurrence of weft interception by a warp sheet can be restricted without increasing the air consumption and, additionally, the procedure for setting of optimum weft inserting conditions can be performed with ease regardless of different kinds of warps which variably influence the condition of weft interception occurrence.
It is to be understood that the present invention is not limited to the above-described specific embodiment, but it may be practiced in other forms, as exemplified by a control program shown by flow chart in FIG. 6-8. In this embodiment, each occurrence of weft interception is counted and the current setting of weft release commence times T_p, T_m is changed to (T_p+ T_p), (T_m+ T_m) and the settings of pressures P_m, P_s of the energize/deenergize times [Asi, Bsi] are changed accordingly. Then, a period of time H₂ is reset.
If no weft interception takes place during the period of time H₂, the setting change according to whether or not the times T_p, T_m had ever been changed to advance is made in the same manner as in the previous embodiment.
The period of time H₂ in this embodiment is set shorter than the period of time H₁ in the first embodiment. Therefore, the weft release commencement times can be changed more finely, hence with higher degree of accuracy.
This embodiment according to the control program shown by the flow chart in FIGS. 6-8 is particularly suitable for weft insertion controlling during trial weaving operation of the loom before it is shifted to actual production weaving operation. Still another weft insertion controlling program shown by flow chart in FIGS. 9-14 is a combination of the two control programs of the previous two embodiments, which is designed to be applicable to both trial and production weaving operations. That is, the program according to FIGS. 6-8 is used in the trial weaving and the program of FIGS. 3-5 is used in the production weaving. The loom operation is shifted from the trial weaving to the production weaving when no weft interception occurs during a predetermined number of cycles of the time period Hz.
FIG. 15 shows an example of another possible method of detecting a weft insertion failure due to weft interception by a warp sheet. In this embodiment, a plurality of weft detectors 34 are arranged at equally spaced intervals along the weft insertion passage in the region within the weaving width of the loom for detecting the time at which the leading end of an inserted weft reaches each of the weft sensors 34.
Referring to the graph shown in FIG. 16, the curved line D1 represents a condition of normal weft insertion, Dz shows a condition in which the leading end of an inserted weft has failed to reach the extreme end of the weft sensor 9. The curved line D₃ shows a condition in which a weft interception has occurred.
Thus, the different conditions of weft flying after being released from the main weft inserting nozzle, which can be represented by the curved line D₁, D₂ or D₃ in FIG. 16, can be distinguished by the information of detection from the weft detectors 34.
To accomplish successful weft insertion controlling on the basis of information of weft insertion failure due to weft interception by a warp sheet and to reduce consumption of air under pressure used for weft insertion.
If a weft fails to be inserted through a warp shed properly, insertion of a weft portion Y₂ succeeding the faulty weft Y₁, Y₃ or Y₄ is prevented by air flow injected by the blow nozzle 18. The succeeding weft portion Y₂ is introduced into the weft introducing duct 19 by the air flow from the blow nozzle 18 and the faulty weft Y₁, Y₃ or Y₄ is pulled out from the warp shed by the withdrawing action of the paired rollers 26, 27. Different extending conditions of the faulty weft Y₁, which has failed to reach the extreme end of weft insertion passage, and of the faulty wefts Y₃, Y₄ in the region adjacent the inlet of the weft introducing duct 19 are distinguishably detected by the intercepted-weft detector 28. According to the information of detection by the detector 28, the computer control C₁ changes the setting of commencement times of energization of the solenoid 2 and of the solenoid for valve V₁, hence the weft insertion commencement time.
The apparatus according to present invention is also applicable to a jet loom having a weft measuring and storage device of air pool type. In such an application of the apparatus, the weft insertion commencement time regulating means is comprised of a weft gripper arranged between an air pool pipe and a main weft inserting nozzle and a solenoid-operated valve connected to the main weft inserting nozzle.
As it would be now apparent from the foregoing, the apparatus according to the present invention, according to which the weft insertion commencement time setting is changed according to the information of detection from weft detector means, can provide weft insertion controlling on the basis of information of an actual weft insertion failure and offer advantages of preventing the occurrence of weft interception and of contributing to reduction of air consumption.

DESIGNATION OF REFERENCE NUMERALS

2 ... Electromagnetic solenoid as the weft insertion commencement time regulating means, 28 ... Intercepted-weft ... detector, 34A, 34B, 34C Weft detectors in a modified form of the intercepted-weft detector, V₁ ... Solenoid-operated valve as the weft insertion commencement time regulating means, C₁ ... Computer control as the control means.

Claims

Weft insertion control apparatus in a jet loom wherein a weft (Y) is inserted into a warp shed by air jet injected form a main weft inserting nozzle (4), said apparatus comprising:
weft insertion commencement time regulating means (C₁) adapted to be electrically switchable between the weft releasing condition wherein a weft (Y) is allowed to be inserted and the weft release stop condition wherein the weft is kept from being inserted, for regulating the time at which each weft insertion is commenced;
detector means (9) for detecting a faulty weft which has failed to be inserted properly through a warp shed by being intercepted by a warp sheet at a region adjacent the entrance of the warp shed; and
control means (C₁) for controlling the switching operation of said weft insertion commencement time regulating means according to weft insertion commencement time setting;
said control means (C₁) having a function of changing said weft insertion commencement time setting according to information of detection by said detector means (9).
Weft insertion control apparatus as claimed in claim 1, further including weft removing means (18, 19, 24, 25, 26, 27, 23), placed between main weft inserting nozzle (4) and the weft insertion side of the warp shed.
Weft insertion control apparatus as claimed in claim 2, further including computer control means C₃ for controlling and operating said weft removing means (18, 19, 24, 25, 26, 27, 23).
Weft insertion control apparatus as claimed in claim 2 or claim 3, said weft removing means (18, 19, 24, 25, 26, 27, 23) including blow nozzles (18, 23) for transporting the weft yarn to be removed.
Weft insertion control apparatus as claimed in any of claims 2 to 4, said weft removing means (18, 19, 24, 25, 26, 27, 23) further including detector means (28) of image sensor type for detecting weft intercepted by the weft removing means (18, 19).
A loom with a weft insertion control apparatus as claimed in any of claims 1 to 5.