JPH03213540A - Weft length-measuring and storing device of liquid jet loom - Google Patents

Abstract

PURPOSE:To wind a weft on a fiber-storing drum in an accurate winding amount without damaging the weft by controlling the rotation rate of a motor so that a required amount of the weft may be wound on the fiber-storing drum in response to the rotation of a loom crank shaft before the next picking process. CONSTITUTION:A picking pattern signal S1 is inputted into a controller 2 from a picking pattern setting device 1 and a timing signal-generator 3 outputs a timing signal S2 for each prescribed crank angle of a crank shaft of a loom. The controller 2 outputs a picking information signal S3 into a driving circuit 4 to control the rotation rate of a motor 5-8 so that a required amount of the welts are wound on fiber-storing drums 52, 82 in response to the rotation of a crank shaft of the loom before the next picking process.

Description

[Detailed Description of the Invention] 1- <Industrial Application Field> The present invention relates to a fluid jet loom, more specifically a so-called drum storage type fluid jet loom in which weft yarn is wound and stored on the circumference of a drum. This invention relates to a weft length measurement and storage device.

<Prior art> A typical drum-type storage device for a fluid-jet loom is:
For example, in the case of one color, the special opening is 52-155258, the reservoir for the 2nd replacement, the special opening of 56-4746, the special opening of 56-58032, the special opening 56-58029, the special opening. No. 56-63048 is known. In these storage devices, it is naturally not possible to select multiple colors if the storage device is for one color, and if it is a device for changing over two colors, it is not possible to select multiple colors.
It has a yarn storage drum that stores two wefts per cycle, and a pin that engages the weft pulled out from the yarn storage drum only at a predetermined timing, and two sets of these storage devices are used. By alternately inserting two picks of the weft yarns stored in them, two colors and two wefts are changed.

(Problems to be Solved by the Invention) 2- However, for example, in a drum-type storage device using an intermittent yarn feeding method, excessive tension may be applied to the weft due to slipping between the weft and the yarn storage drum at the start of weft length measurement. It is difficult to regulate the amount of weft length measurement because the weft yarn does not suddenly stop due to inertia or when the weft length measurement is completed. In order to prevent such troubles, this type of drum-type storage device usually employs a continuous yarn feeding system.

In other words, if we take the above-mentioned type of storage device for two-way change as an example, the storage speed of each yarn storage drum is constant while the loom is operating (the speed at which 0.5 picks of weft yarn is stored in one revolution of the loom). It is.

However, in the conventional continuous yarn feeding type weft length measuring and storage device,
Since the yarn storage drum is rotated by mechanical means such as gears, the rotation speed of the yarn storage drum cannot be freely changed while the loom is operating.

Furthermore, the timing for inserting the weft yarn wound around each yarn storage drum is set by changing the position of the cam attached to the rotating shaft that is synchronized with the crankshaft, so these timings can be set once. − Once set, it cannot be easily changed, let alone while the loom is running.

Therefore, in a continuous yarn feeding type weft length measuring and storage device,
For example, the order in which the weft yarns on each yarn storage drum are inserted is 2 colors and 2 colors.
In the case of the interlacing method, it is fixed that two picks should be picked alternately, and it is impossible to insert multiple weft yarns in any order depending on the type of woven fabric.

On the other hand, for example, Japanese Patent Publication No. 49-12875 discloses that an optical sensor is used to monitor the amount of weft wound on the yarn storage drum, and the drive motor is rotated or stopped according to the amount of weft wound on the yarn storage drum. A technique is described in which the amount of weft wound on the yarn storage drum is controlled to be maintained at a predetermined amount.

However, in this case, the motor is configured to stop when the weft winding amount on the drum reaches a predetermined amount, and to rotate when the weft winding amount becomes less than the predetermined amount due to consumption associated with weft insertion. Becomes intermittent. As a result, there is a problem in that intermittent impacts are applied to the weft yarn wound on the drum, causing damage.

Furthermore, an optical sensor for monitoring the amount of weft yarn winding is easily affected by disturbances such as strobe light or indoor lighting, and it may not be possible to determine the presence or absence of yarn depending on the color of the weft yarn.

This makes it easy to falsely detect (and also makes it difficult to accurately monitor the weft winding amount, which may result in too much or too little weft winding. If there is too much weft winding, the weft winding will not be wound on the yarn storage drum. If the weft thread is too small, the weft thread may overlap with the adjacent weft thread, making it impossible to unwind the weft smoothly, resulting in poor weft insertion.

This invention is intended to solve the above problems, and it is possible to store the necessary amount of yarn in the yarn storage drum before the next weft insertion without using a conventional optical sensor. The rotational speed of the yarn storage drum can be changed as appropriate.

<Means for Solving the Problems> A weft length measurement and storage device for a fluid jet loom according to the present invention provides a weft length measurement and storage device for measuring and storing wefts on a yarn storage drum. a motor that drives the weft length measuring and storage device for winding the weft; a timing signal generator that is attached to the crankshaft of the loom and outputs a timing signal at every predetermined crank angle; and a timing signal generator that receives the timing signal; The present invention further comprises a control section that controls the rotational speed of the motor so that a necessary amount of weft yarn can be stored on the yarn storage drum before the next weft insertion during operation of the loom.

<Function> As mentioned above, the rotation speed of the motor is controlled according to the rotation of the loom's crankshaft (main shaft) so that the required amount of weft yarn is wound on the yarn storage drum before the next weft insertion. This allows the motor to rotate continuously.

Therefore, intermittent impacts are not applied to the weft threads wound on the yarn storage drum, and no damage is caused to the weft threads.

In addition, instead of detecting the weft winding amount using an optical sensor with low detection accuracy, the rotational position of the crankshaft of the loom is detected at 6-1, and the rotation of the drum drive motor is controlled based on the detected rotational position. Since it is configured to control, it is possible to accurately control the rotation amount of the motor and, by extension, the amount of weft winding stored on the drum, and it is possible to prevent the occurrence of weft insertion defects.

<Embodiments> Examples of the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, two sets of weft storage devices of the yarn storage drum type described in Japanese Patent Application Laid-Open No. 155258/1982 are arranged in parallel to allow two colors to be freely selected.

In the drawing, a weft insertion pattern setting device 1 sets and stores a weft insertion pattern, that is, a selection order of weft threads. As such a weft insertion pattern setting device, a device keyboard composed of a magnetic tape, a tape league, a card league, or a memory can be used. The weft insertion pattern setting device outputs the set and stored weft insertion pattern signal S1.

The output of the weft insertion pattern setter 1 is input to the control section 2 via the bus line 237-. The control unit 2 includes a central processing unit (hereinafter referred to as rCPUJ) 21, a memory 22, and a data bus 23. Memory 22 is RAM
The program memory section stores a program for instructing the operation of the CPU 21, and the weft insertion pattern signal S1 of the weft insertion pattern setter 1 is inputted to the weft insertion pattern setter 1 as described later. It consists of a data memory section in which pattern, ie, weft selection information is stored.

Further, the output of the timing signal generator 3 is input to the control section 2 via the data bus 23. The timing signal generator 3 includes an absolute shaft encoder attached to the crankshaft of the loom, and outputs a timing signal S2 at every predetermined crank angle. and,
The control section 2 outputs a weft insertion information signal S3 consisting of a weft insertion instruction signal S31 and a weft insertion preparation signal 832, which will be described later, to the drive circuit 4.

The drive circuit 4 outputs control signals 85 to S8 each consisting of a pulse signal to the pulse motors 5 to 8, as will be described later, in response to the weft input information signal S3 from the control unit 2, and adjusts their rotational speed as appropriate. Adjust.

Drive shaft 51 of pulse motors 5 and 8. 81 are connected to the rotating shafts of yarn storage trucks A52 and 82, respectively. A length measuring roller 53 is in pressure contact with the outer peripheral surface of the yarn storage drum 52, and the yarn of the yarn supply body 54 is attached to the yarn guide 5.
5. It is supplied via the length measuring roller 53.

The yarn is stored in the yarn storage drum 52.
is driven by the pulse motor 5, thereby rotating the yarn storage drum 52 and the sub-length roller 53 pressed against it.
This is done by winding the yarn around the outer periphery of the yarn storage drum 52.

The yarn on the yarn storage drum 52 is guided to a clamper 57 and a spray nozzle 58 via a yarn guide 56. Clamper 5
7 opens and closes by moving up and down a lever 571 pressed by a clamper and cam 62 attached to a shaft 61 connected to the pulse motor 6, and at that time releases and grips the thread. Further, a valve 582 is connected to the injection nozzle 58 via a fluid path 581, and the valve 582 has a poppet 583 connected to the shaft 6.
When pressed again by the cam 63 attached to 1, fluid is sent to the jet nozzle 58 through the fluid path 581, and at this time, the thread is jetted from the jet nozzle 58.

Similarly, the yarn on the yarn storage drum 82 is guided to a clamper 87 and an injection nozzle 88 via a yarn guide 86, and these are guided by a clamper cam 72 and a cam 73 attached to a shaft 71 connected to a pulse motor 7. gripping and releasing,
Alternatively, the yarn injection timing is instructed.

The control unit 2 includes a CPU 21 and a memory 2 shown in the drawing.
2, a clock generator consisting of a crystal oscillator etc. that generates a clock signal to give a reference time to the CPU 21, and a system controller or control section 2 that adjusts the flow of signals so that each section operates correctly. Weft insertion pattern setter 1, timing signal generator 3
, an interface unit for adjusting the operating voltage and timing with input/output devices such as the drive circuit 4, but for the sake of convenience, their description and explanation will be omitted.

10- When performing two-color free selection using the weft storage device of the embodiment having the above configuration, first the weft selection order, that is, the weft insertion pattern is set by the weft insertion pattern setting device 1. That is, if the weft insertion pattern setting device 1 is a device composed of a magnetic tape or the like, the required weft insertion pattern is stored on the tape, or if it is composed of a keyboard or the like, the required weft insertion pattern is stored by pressing the keys on the keyboard. Press in the specified order to set the weft insertion pattern. Then, the weft insertion pattern set in the weft insertion pattern setting device 1 is stored in the data memory section of the memory 22 via the data bus 23.

In the program memory section of the memory 22, a program that sets the operating procedure of the CPU is stored in advance in a ROM or the like. The contents to be stored in the ROM are those necessary to perform the operations described in (I) and (II) below, and are stored in the program memory section using a known method.

(I) The weft insertion pattern information stored in the data memory section of the memory 22, that is, the plurality of weft selection information arranged in a predetermined order, is transmitted every rotation of the loom by the timing signal S2 from the timing signal generator 3. sequential memory 2
Read from 2. Then, according to the read weft selection information, the yarn storage drum (5) stores the corresponding weft yarn.
2 or 82) A weft insertion instruction signal (S31) instructing weft insertion of the upper yarn is output to the drive circuit 4.

When the drive circuit 4 receives the weft insertion instruction signal S31 from the control section 2, it outputs a control signal S6 or S7 to either the pulse motor 6 or 7. The pulse motors 6 and 7 each rotate once when the control signals S6 and S7 are input. At this time, the shaft 61. connected to the pulse motors 6, 7. Corresponding clamp cams 62, 72, cams 63 mounted on 71.

73, the corresponding clamper 57. 87, the boppets 583, 883 are pushed and the weft is jetted from either the jet nozzle 58 or 88.

(n) When starting up the loom or during operation, the memory 2
The following (a) and (b) are read out from the weft insertion pattern information stored in the data memory section 2 (12). For convenience of explanation, in the following explanation, the case where the yarn stored in the drum 52 or 82 is inserted is referred to as selecting the weft yarn 1 or 2.

(a) Every time the timing signal S2 is inputted from the timing signal generator 3, or at the time of start-up, it is determined how many steps later each of the wefts 1 and 2 will be selected next in the weft insertion pattern information.

(b) Then, depending on the number of steps until the next selection for each of the weft yarns 1.2, one big of weft yarn is stored in the yarn storage drum 52 or 82 until the next selection. A weft insertion preparation signal (S32) is used to adjust and set the rotation speed of the pulse motor 5 or 8 so that the
) is output to the drive circuit 4 via the data bus 23.

Also, the yarn storage drum 52. In the case where 82 is a two-way changeable type, the weft 1.

Or, if the 20th selection is 2 picks in a row, the yarn for 2 picks will be transferred to the yarn storage drum 5 before the next selection.
Pulse motor 5 or 8 to store in 2 or 82
The rotation speed may be adjusted.

=13- When the above program is stored and set in the memory 22, the weft selection pattern stored in the data memory section of the memory 22 is, for example, 1, 2, 1.

Suppose it was 2.2. In this case, when the loom is started, the control section 2 first sends a weft insertion preparation signal S32 to the drive circuit 4.
is output to. Then, the circuit 4 outputs a control signal S5 to the pulse motor 5 and stores the yarn at a speed such that one pick worth of yarn is stored in the yarn storage drum 52 until the next weft insertion (first step). Rotate the drum 52. At the same time, the drive circuit 4 outputs a control signal S8 to the pulse motor 8 so that the yarn for one pick is stored in the yarn storage drum 82 until the next weft insertion (second step). Rotate 82.

At a predetermined timing after the loom is started, a timing signal S2 is input from the timing signal generator 3 to the control section 2. Then, the control section 2 sends a weft insertion instruction signal S to the drive circuit 4.
31 is output and the weft 1 is selected in the first step, so the drive circuit 4 outputs the control signal S6 to the pulse motor 6, and the pulse motor 14-motor 6 rotates once. At this time, the clamper 57 is opened by being pushed by the clamper cam 62, and the poppet 583 is pushed by the cam 63, and the fluid passage 581 is opened from the valve 582.
Fluid is supplied to the injection nozzle 58 through the yarn storage drum 52, and the yarn wound on the yarn storage drum 52 is inserted from the injection nozzle 58 through the yarn guide 56 and the clamper 57.

Similarly, by the time the second pick starts, the yarn storage drum 82
The yarn for one pick is stored in the . Then, at a predetermined timing, a timing signal S2 is input to the control section 2, and a weft insertion instruction signal S31 is output from the control section 2 to the drive circuit 4. Then, the drive circuit 4 outputs the control signal S6 to the pulse motor 7, so the clamper 87 is opened by the clamper cams 72 and 73 fixedly supported on the shaft 71, and the poppet 883 is pushed, so the yarn storage drum 8
The thread wound around the thread 2 is inserted into the weft from the jet nozzle 88.

Similarly, weft 1 is selected at the 3rd step, and weft 2 is selected at the 4th and 5th steps.
Since the yarn is read in advance by the PU 22, one pick's worth is stored in the yarn storage drum 52 from the 15- point when the first step weft insertion is completed until the third step weft insertion is performed. The pulse motor 5 rotates to store the weft yarns. Further, the pulse motor rotates to store one pick worth of weft yarn in the yarn storage drum 82 from the time when the second step of weft insertion is completed until the fourth step of weft insertion is performed. Then, at the timing of the third weft insertion, the clamper 57 is opened, and the yarn on the yarn storage drum 52 is pulled out by the jet of fluid from the jet nozzle 58 and inserted. Further, at the timing of weft insertion in the fourth step, the clamper 87 is opened, fluid is jetted from the injection nozzle 88, and the yarn wound around the yarn storage drum 82 is inserted into the weft.

When moving from the fourth step to the fifth step, the same operation as continuous weft insertion for one color is performed. In addition, when using a drum for double-knitting, yarn for two picks has already been wound around the storage/yarn drum 82, but a pin (not shown) engages the yarn at an appropriate timing as in the conventional case. This prevents the yarn from being unwound from the yarn storage drum 82, and only one pick worth of yarn is unwound from the yarn storage drum 16-82 when the fourth step of weft insertion is completed. Furthermore, the fifth
When it comes time to insert the weft in the step, the clamper 87
There is a pause again, and the yarn on the yarn storage drum 82 reaches the jet nozzle 8.
Weft insertion starts from 8.

If the loom stops due to trouble such as warp breakage or poor weft insertion while the loom is running, and the loom is reversed to repair the damage, and when the loom is restarted after the trouble is repaired, the number of picks reversed must be The operating state can be immediately entered by simply counting back the execution steps of the weft insertion pattern stored in the control section 2 by the number of steps in a known manner. Furthermore, in order to prevent the memories in the memory 22 from being erased due to power being turned off due to a power outage or end of work while the loom is in operation, the memory 22 may be provided with a power backup, if necessary.

By the way, in the above explanation, for convenience of explanation, "first
The pulse motor 5 is rotated so that one pick worth of yarn is stored in the yarn storage drum 52 before the step weft insertion is performed. ” or “The pulse motor 8 is rotated so that the yarn for one pick is stored in the yarn storage drum 82 before the fourth step of weft insertion.” 52 and 82 rotate continuously while the loom is operating, although there are differences in speed and speed. Therefore, strictly speaking, they mean that by the time the weft insertion of the first step is completed, one big of yarn is transferred to the yarn storage drum. "Rotate the pulse motor 5 so that the yarn is stored in the yarn storage drum 82" or "Rotate the pulse motor 8 so that the yarn for one pick is stored in the yarn storage drum 82 by the time the fourth step of weft insertion is completed.""Let it happen."

Also, depending on the type of woven fabric, the weft 1. The number of picks 2 to 2 may be selected a long time ago, but in such cases, if the range of reading the weft insertion pattern (the number of picks) by the CPU 21 is expanded appropriately, the number of picks selected from the yarn storage drums (52, 8
2) The rotation never stops.

In the above description, the yarn storage drums 52 and 82 are rotated using the pulse motors 5 and 8, but a DC motor, an induction motor, or the like may be used if necessary.

18- Also, in the above embodiment, weft insertion is performed by rotating the shaft 61.71 to which the cam is attached by the motor 6.7, but the invention is not limited to this. The clamper may be opened and closed, or fluid may be injected from an injection nozzle in response to a signal output from the drive amount path.

Further, in this embodiment, two-color free selection is performed using a storage device for one-time change (for one color), but two-color free selection can be similarly performed using a storage device for two-way change. Furthermore, in this embodiment, the free selection of two colors has been explained, but by increasing the number of pins/nodes used by the control unit and the number of yarn storage drums, it is possible to freely select multiple colors. .

Moreover, although the above is an example of free selection of multiple colors, it is clear that the present invention can also be applied to the case of selecting one color. In this case, as in the case of multicolor free selection, look ahead for each weft (find the number of steps until the next selection for each weft, and change the rotation speed of the corresponding yarn storage drum accordingly) (19) is not necessary, and the motor may be driven at a predetermined speed.

Furthermore, although the above is an example using a rotating storage drum,
Of course, the present invention can also be applied to the case where a stationary drum is used.

(Effects of the Invention) As is clear from the above description, according to the present invention, the required amount of weft yarn is wound on the yarn storage drum until the next weft insertion according to the rotation of the loom crankshaft. Since the motor rotation speed is controlled in this way, it is possible to continuously rotate the motor at an appropriate speed, and there is no intermittent impact on the weft threads wound on the yarn storage drum. damage can be prevented.

Furthermore, since the weft storage amount is controlled based on the rotational position of the crankshaft of the loom, the weft winding amount can be accurately controlled, and as a result, weft insertion defects can be prevented from occurring.

[Brief explanation of drawings]

The accompanying drawings are explanatory diagrams showing an embodiment 20- in which two colors are freely selected using a yarn storage drum-type weft storage device using the present invention. 1... Weft insertion pattern setter, 2... Control section, 3...
- Timing signal generator, 4... Drive circuit, 5-8 pulse motor, 21... Central processing unit, 22... Memory, 23... Pass line, 52.82... Yarn storage drum, 53.83...Length measuring roller

Claims (1)

[Scope of Claims] In a weft length measurement and storage device for measuring and storing a weft on a yarn storage drum (52, 82), the weft length measurement is performed in order to wind the weft on the yarn storage drum (52, 82). a motor (5, 8) that drives the storage device; a timing signal generator (3) that is attached to the crankshaft of the loom and outputs a timing signal (S2) at every predetermined crank angle; and the timing signal (S2). is input, and while the loom is operating, the yarn storage drums (52, 82
) and a control section for controlling the rotational speed of the motors (5, 8) so that a necessary storage amount of weft can be obtained. .