JPH0258378B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for phasing a weft length measuring device in a shuttleless loom such as an air jet loom or a water jet loom. More specifically, the present invention relates to a method for phasing a weft length measuring device in a drum pool type jet loom in which the weft yarn unwound from the weft cheese is stored on a weft length measuring drum and is inserted by a jet nozzle.

The weft measuring drum of the present invention may be of the type in which the drum rotates and the weft is wound around its circumference and stored, or the drum may be stationary and the weft winding tube (winding arm) rotates around it. It may be of any type in which the weft is wound and stored.

[Conventional technology]

The drum pool type weft storage device must rotate in complete synchronization with the crankshaft of the loom body, and cannot rotate in reverse. If synchronization with the crankshaft is not achieved, a predetermined length of weft yarn cannot be inserted at a predetermined timing, resulting in a weft insertion error. Also, if the drum etc. is rotated in the opposite direction,
The wound weft becomes disordered and weft insertion becomes impossible.

A loom may stop operating due to yarn breakage or other causes. In such a case, restart the machine after removing the cause of the stoppage. Even in that case, the drum pool type weft storage device needs to rotate in complete synchronization with the crankshaft of the loom main body for the reasons mentioned above, and cannot rotate in the opposite direction.

[Problems to be Solved by the Invention] Japanese Patent Application Laid-Open No. 125943/1983 states that when a loom stops operating due to thread breakage or other causes, the weft is wound around a drum-type weft pool device. ,1
A method is disclosed that can almost automatically store the weft yarns necessary for pick weft insertion.

In this method, a weft length measuring device using a drum is connected to a drive shaft of a loom via a clutch. During steady operation, the clutch is engaged and the length measuring drum drive system is driven in synchronization with the weaving operation of the loom.

When a weaving abnormality occurs, the loom is stopped (crank angle = approximately 300 degrees), the clutch is disconnected, the connection between the drive system of the weft length measuring drum and the loom crankshaft is cut off, and the loom is reversed to open the warp threads. After processing the erroneous yarn, the machine is reversed so that the crank angle matches the above-mentioned crank angle, and the auxiliary motor moves the weft length measuring drum to the appropriate position for threading, and the weft yarn at the appropriate position is The weft end is threaded onto the length measuring drum, and then the auxiliary motor rotates the weft length measuring drum in a predetermined manner to store a predetermined amount of weft on the weft length measuring drum.

In order to perform the above weft preparation method reliably, it is necessary to match the crank angle of the machine when the machine is stopped with the crank angle of the machine before storing the weft in the weft measuring drum. It is necessary to match the timing of each part.

However, in reality, it is very difficult to stop the loom by making the crank angle after reversing the loom match the crank angle when the loom is stopped, and the drive system of the weft length measuring drum and the loom This causes the inconvenience that the clutch does not connect with the crankshaft.

In other words, if the loom side stops behind the coupling part of the clutch in terms of crank angle (a position advanced in the normal rotation direction of the loom), the weft length measuring drum must be rotated by the angle that is the difference between the two angles. The clutch can be engaged immediately.

However, if the loom stops in front of the joint of the clutch in terms of crank angle (a position delayed in the normal rotation direction of the loom), the weft length measuring drum can only rotate in the forward direction, so the clutch Before joining, it is necessary to rotate the weft length measuring drum by an angle close to one revolution of the machine.

While the weft length measuring drum is being rotated, the locking pin of the weft storage drum is activated, and one pick of weft that was stored in the weft length measuring drum before the rotation is sent out. Also, rotating the weft length measuring drum for about one rotation in this way takes a long time,
The down time of the loom becomes longer and the operating rate decreases.

However, with the conventional method, it is very difficult to completely match the crank angle after the loom is reversed with the crank angle when the loom is stopped, and if you try to force the crank angle to match the crank angle when the loom is stopped, the equipment becomes extremely complicated. This results in high equipment costs.

Furthermore, in an attempt to control the rotation of the weft length measuring drum according to the relationship between the crank angle after reversing the loom and the crank angle when the loom is stopped, the amount of rotation of the weft length measuring drum is controlled according to the stop position. Doing so will complicate control.

In addition, in addition to weft insertion errors, weaving errors include feeding errors in which the weft is not fed to the main nozzle, warp thread breakage, and selvedge thread breakage, so different measures should be taken depending on these problems. In this case, the operator may make an operational error, resulting in a longer operation time or an insufficient quality of the obtained woven fabric.

[Purpose of the invention]

The present invention eliminates the problems associated with the above-mentioned prior art, eliminates the need to delicately control the stop position of a loom, eliminates the need for a complicated and expensive device for controlling the stop position, and furthermore, eliminates the need for a complicated and expensive device to control the stop position of the loom. It is an object of the present invention to provide a method for phasing a weft length measuring device in a mechanism capable of shortening the abnormality processing time.

Furthermore, as shown in the embodiments of the present invention, it is also possible to respond to errors in weft supply and weft insertion with the same operation, and in this case, operator errors in operation can be avoided. This makes it possible to weave high-quality fabrics.

[Means for solving problems]

The present invention has achieved the above-mentioned purpose by disconnecting the drive system of the weft length measuring drum from the crankshaft of the loom using the clutch when the loom is stopped, and reversing the loom by the crankshaft. In the alignment method, reverse the machine at low speed,
After the weft length measuring drum is reversed beyond the stop position of the weft length measuring drum which is at the initial machine stop position during machine stop operation, the clutch of the drive system of the weft length measuring drum is turned on, and then the loom is restarted and the This is achieved by a method of phasing a weft length measuring device in a loom, which connects the drive system of the weft length measuring drum and the crankshaft of the loom during forward rotation.

[Effect]

In the present invention, when reversing the loom, the loom is reversed at a low speed by intentionally exceeding the initial loom stop position, rather than trying to directly match the initial loom stop position during the loom stop operation. To ensure that the loom is not affected by inertia, the loom is positioned at a crank angle in front of the coupling part of the clutch, and the loom is stopped reliably. Therefore, when the machine rotates the weft length measuring drum by the difference between the two angles in the low speed range when the machine starts restarting, the clutch is securely engaged and restarts the machine and the weft length measuring drum. You can start.

According to the present invention, it is only necessary to drive the loom at low speed and reverse the weft length measuring drum at the initial loom stop position, and there is no need to delicately control the stop position of the loom as in the prior art. This eliminates the need for a complicated and expensive device for controlling the stop position.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a schematic plan view of an air jet room in which the present invention is implemented, and the crankshaft of the loom is driven by a belt from a main motor. Further, the crankshaft is connected to a winding arm 28a of a weft measuring drum 28 via clutch members 14, 15 and a drive belt 27. The B pin 29 and the A pin 30 move in and out of the circumferential surface of the weft length measuring drum 28 in synchronization with the rotation of the crankshaft, and measure the unwound weft from the weft cheese 32 via the tensor onto the weft length measuring drum 28. Controls winding and drawing to the main air jet nozzle 49.

Clutch member 14 is integrally connected to a drive shaft 19 connected to a crankshaft. On the other hand, the clutch member 15 is spline connected to the driven member 20. Further, the sleeve 16 is installed to be rotatable relative to the driven member 20 and movable in the axial direction. Therefore, the clutch member 15 moves integrally with the sleeve 16 in the axial direction, but is rotatable relative to the sleeve 16.
Note that, as shown in the figure, the clutch members 14 and 15 are formed with engagement protrusions and recesses at positions eccentric from the axes of the drive shaft 19 and the driven 20, so that the clutch members are engaged only when the phases of the protrusions and the recesses match. 14 and 15 are engaged.

Boss 17 and sleeve 16 fixed to driven 20
A compression spring 18 is installed between the left end of the
The clutch member 15 is always urged in the right direction, that is, toward the clutch member 14 side. A gear 34 is integrally attached to the end of the driven shaft 20. gear 34
is engaged with a gear 35, which is connected via an electromagnetic clutch 33 to the output shaft of an auxiliary motor 36.

A lever 21 is swingably supported by a pin 22 provided on the machine base, and its tip is engaged with the sleeve 16. The other end of the lever 22 is connected to a piston rod of an air cylinder 23 by a pin 24.

When the switching valve is operated to extend the piston rod of the air cylinder 23, the lever 21 rotates counterclockwise to disengage the clutch members 14 and 15 against the spring force of the compression spring 18. If the electromagnetic clutch 33 is connected in this state,
The rotation of the auxiliary motor 36 is transmitted to the winding arm 28a of the weft length measuring drum 28 via the gears 34, 35 and the drive belt 27. On the other hand, when the piston rod of the air cylinder 23 is moved backward, the clutch members 14 and 15 are engaged by the spring force of the compression spring 18, and the rotation of the main motor is applied to the winding arm 28a of the weft measuring drum via the drive belt 27. communicated.

Note that the limit switch 26 is actuated by the lever 21 and detects engagement of the clutch members 14 and 15.

Reference numeral 71 is a yarn guide, and 72 is a gripper, which is opened and closed by a cam 11 that rotates in time with the crankshaft, a lever 12 that swings around a fulcrum 13, and a cam follower 10 supported by the lever 12. . The filler 73 detects that the weft yarn is being supplied to the main air jet nozzle 49.

The main air jet nozzle 49 injects compressed air in synchronization with the movement of the crankshaft, and inserts the weft yarn into a shed formed between the warp yarns. Feeler 51,
52 detects insertion of the weft yarn, and reed 25 beats the inserted weft yarn.

Furthermore, an ejector type suction nozzle 61 is provided as a suction member between the main air jet nozzle 49 and the selvage thread. A shutter 63 is rotatably supported, and a suitable reciprocating member 62 such as an air cylinder or an electromagnetic solenoid is connected to the rotation shaft of the shutter 63. Reciprocating member 6
2, the shutter 63 can be moved between a position outside the weft path ejected from the main air jet nozzle 49 and a position on the weft path.

The air blow nozzle 64 faces the suction nozzle 61 across the weft insertion path, and injects an air flow toward the suction nozzle 61 to blow the weft interrupted by the shutter 63 into the suction nozzle 61. Make it absorb.

The action will be explained below.

<During steady operation> The crankshaft is driven by the main motor to cause the heald frame to move in an opening motion, and the weft is inserted into the shed formed between the upper and lower warps.

That is, in FIG. 1, the weft yarn unwound from the weft cheese 32 through the tensor is transferred from the crankshaft to the clutch members 14, 15 and the drive belt 2.
After being wound around the weft length measuring drum 28 and measured by the winding arm 28a of the rotating weft length measuring drum 28 via the gripper 72, it reaches the main air jet nozzle 49.

The gripper 72 and the main air jet nozzle 49 are operated and controlled in synchronization with the rotation of the crankshaft, and the weft stored on the weft length measuring drum 28 is measured by compressed air injected from the main air jet nozzle 49. , the weft is inserted into the shed formed between the upper and lower warp threads.

Next, an embodiment of a method for adjusting the phase of a weft length measuring device in a loom during an abnormal stop according to the present invention will be described.

<When weft insertion error> (Refer to the second row from the right in Figure 2) The detectors 51 and 52 installed near the selvage threads on the opposite side of the main air jet nozzle 49 detect when the warp threads are almost closed (when the crank The weft insertion condition is checked at an angle of 250 to 300 degrees), and if for some reason the weft inserted into the shed does not reach the selvage yarn on the opposite side of the main air jet nozzle 49, or a weft insertion error occurs, it is detected. The devices 51 and 52 issue a weft insertion error signal.

A main motor stop signal based on this weft insertion error signal causes the motor that drives the machine frame to stop operating and enter into inertial operation.

Furthermore, when a weft insertion error signal is transmitted, the piston of the radially reciprocating member 62 moves forward to cause the shutter 63 to intersect with the weft path, and the air blow nozzle 64
Inject compressed air from. In this way, the weft yarn ejected from the main air jet nozzle 49 after a weft insertion error is intercepted by the shutter 63, guided by the air jetted from the air blow nozzle 64, and reaches the suction nozzle 61. is attracted to.

After the machine, which was operating inertia, moved for about one cycle, the warp threads were almost closed (the crank angle was about
300 degrees) (this stop position is called the initial machine stop position), and a machine stop signal is sent.

When the machine stops, the operator turns on the reverse button. This causes the air cylinder 23 to operate,
The clutch members 14 and 15 are disengaged so that the rotation of the crankshaft is not transmitted to the winding arm 28a of the measuring drum, while the electromagnetic clutch 33 is connected. In this state, in order to remove the misplaced weft inserted into the shed, the machine is reversed more than once (approximately 480 degrees at the crank angle), and the warp is opened, which is ideal for removing the weft and is placed on the sled. After the machine is reversed (from 300 degrees to 180 degrees in crank angle) to the crank angle at which the main nozzle 49 is closest to the suction nozzle 61 (approximately 180 degrees), the machine is stopped.

Next, the worker inspects the machine, and first,
It is checked whether the weft thread is connected from the weft thread cheese 32 to the suction nozzle 61 (if the weft thread is not connected, the next processing is performed as a supply error).

The worker removes the weft yarn that was inserted incorrectly, turns on the confirmation button installed to prevent fools (fool pool), and then turns on the start button.
The weft in front of the main nozzle 49 is cut by a cutter provided near the suction nozzle 61, and then the machine is slowly reversed at low speed (245 degrees reversed at the crank angle), and the machine is changed from the initial machine. Slightly delayed in the forward rotation direction from the stop position (crank angle approximately 300 degrees),
The engine rotates in reverse until it reaches the restart stop position (crank angle approximately 295 degrees), just before the clutch engages. Since the machine is reversed at low speed, the desired angle can be easily achieved.

Next, the air cylinder 23 is turned off, and the spring 18 presses the clutch member 15 toward the clutch member 14 to turn the clutch on, but since the two clutch members 14 and 15 are out of phase, they do not engage.

When the machine is restarted in this state, if the clutch members 14 and 15 match in phase during low-speed driving in the startup state, both clutch members 14 and 15 will engage, and the machine and weft length measuring devices will match in phase. It rotates as a unit in the ivy state.

<In the case of weft supply error> (See the right end of Fig. 2) One of the causes of the weft insertion error as described above is that the weft yarn feed from the weft cheese 32 to the main air jet nozzle 49
During this period, the weft yarn may be cut and the weft yarn may not be supplied to the main air jet nozzle 49 (a so-called supply error).

In this case, the weft yarn is not properly connected from the weft cheese 32 to the suction nozzle 61 when the machine is stopped. In such a case, after stopping the machine at the above-mentioned initial machine stop position and turning on the reverse button, thread the thread through the weft length measuring drum 28,
The weft is normally connected from the weft cheese 32 to the suction nozzle 61.

That is, the weft is pulled out from the weft cheese 32, passed through the main air jet nozzle 49 from the circumferential surface of the weft length measuring drum 28, and the tip of the weft is sucked into the suction nozzle 61. Note that instead of being sucked into the suction nozzle 61, it may be hooked onto the temple of the loom, for example.

In this way, the weft is guided from the weft cheese 32 to the suction nozzle 61, and the auxiliary motor 36 drives the driven 20 and the winding arm 28a of the measuring drum in the forward direction by one rotation of the machine (the forward rotation angle is the crank angle). 360 degrees), the length measuring drum 28
The weft thread is wrapped around the top. By turning on the reverse button, the machine can be reversed 480 degrees (crank angle 180
(stop at a certain degree), remove the wrong thread, turn on the confirmation button and start button, cut the weft thread at the tip of the main nozzle, crank angle beyond the initial stop position of the machine
Perform a low-speed reversal to 295 degrees and stop the machine. Then turn on the clutch and restart the machine. When the machine is started, the clutch is connected and the weft length measuring drum rotates together with the machine.

<When warp threads or selvage threads break> (See the left side of Fig. 2) If the warp threads or selvage threads break, tie the cut warp threads or selvage threads together after the machine has stopped, and turn on the confirmation button. Then turn on the start button. At the time of warp thread breakage or selvage thread breakage, there is no mis-inserted weft thread, so there is no need to remove the mis-inserted weft thread. From the crank angle when stopped (approximately 300 degrees) to the predetermined crank angle (approximately 180 degrees) that is optimal for cutting the weft.
Reverse the machine (300 degrees → 180 degrees to 120 degrees).

Below, cut the weft by following the same procedure as when turning on the start button when making a mistake in weft insertion, as described above.
The machine rotates in reverse to a position beyond the initial stop position (crank angle approximately 295 degrees) and stops. In this state,
When the machine resumes operation with the clutch on, the clutch is connected and the machine and weft length measuring drum rotate in phase.

<When operating the stop button> (See the left end of Figure 2) In this case, the process is the same as the process when the warp thread breaks or the selvage thread breaks as described above, except that the warp thread or selvage thread tying process is not required. .

In the present invention, when a misplaced yarn is detected, the weft yarn next to the misplaced yarn is gripped by a gripper or the like on the upstream side of the main air jet nozzle, and the weft is prevented from being inserted by preventing it from being sprayed from the main air jet nozzle. is also applicable.

Further, the operation based on the cause of the stop shown in FIG. 2 is a standard operation, and various applications are possible. As an example, repairing scratches, etc. (for example, after weaving several picks for some reason even though the warp threads were broken,
When a worker performs a manual operation (when stopping), it is not easy to adjust the starting crank angle to the correct starting crank angle. If you do, you can start it.

〔Effect of the invention〕

In the present invention, when the loom is reversed, instead of trying to match the initial machine stop position at the time of the machine stop operation, the machine is driven at a low speed to consciously and easily set the initial machine machine stop position. Stop the loom at the position beyond which it has passed, turn on the clutch at this position, restart the loom, connect the clutch securely in the low speed region at startup, and adjust the phase between the loom and the weft measuring drum. and start steady operation.

According to the present invention, it is only necessary to reverse the loom at a low speed to a position beyond the initial loom stop position, and there is no need to delicately control the stop position of the loom unlike in the prior art, and there is no need for complicated and complicated control to control the stop position. Expensive equipment can be eliminated. Therefore, the processing time when the loom is stopped can be shortened, the time when the loom is stopped is shortened, and the operating rate is improved.

In addition to weft insertion errors, errors such as feeding errors in which the weft is not fed to the main nozzle, warp thread breakage, and selvedge thread breakage can be handled in the same way regardless of these abnormalities, and operator operational errors can be avoided. reduction, the operation time is shortened, and the quality of the obtained woven fabric is good.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an outline of the drive system of an air jet room according to this embodiment, and FIG. 2 is a flowchart of one embodiment of the present invention. 14, 15...Clutch member, 28...Weft length measuring drum, 49...Main air jet nozzle,
51, 52...detector, 61...suction nozzle, 62...reciprocating member, 63...shutter,
64...Air blow nozzle.

Claims (1)

[Claims] 1. In a method for phasing a weft length measuring device in a loom, in which the drive system of the weft length measuring drum is disconnected from the crankshaft of the loom by the clutch when the loom is stopped, and the loom is reversed by the crankshaft. After the weft length measuring drum is reversed and reversed beyond the stop position of the weft length measuring drum which is at the initial machine stop position when the machine is stopped, the clutch of the drive system of the weft length measuring drum is turned on, and then the loom is restarted. A method for phasing a weft length measuring device in a loom, comprising connecting a drive system of a weft length measuring drum to a crankshaft of the loom during normal rotation immediately after startup.