JP2810190B2 - Loom starting method and device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a loom, which can effectively prevent the occurrence of a weaving step caused by a change in load on the loom, and a device therefor.

Prior Art The load on a loom varies with various factors.

That is, when weaving a woven fabric with a complicated weaving pattern using a plurality of heald frames, the load on the loom fluctuates periodically in units of the repetition period of the opening pattern of the heald frames. Out of all the heald frames, the ascending number (refers to the number of heald frames driven upward at the time of warp shedding, the same applies hereinafter) and the descending number (means the number of heald frames driven downward at the time of warp shedding, the same applies hereinafter) This is because the load greatly changes depending on the ratio of ()). Also, a loom that forms a pile on a woven fabric by so-called terry motion, such as a towel loom,
The load periodically fluctuates in units of one terry motion cycle.

On the other hand, the machine may have a weaving step called a starting step because the initial beating force immediately after the start is weaker than that after the steady state operation state is reached. A start-up method for positively increasing the start-up torque from the steady state is known (so-called super-start-up method, for example, Japanese Patent Publication No. 60-50899). In this method, for example, the winding torque of the loom motor is set to Δ (delta) connection at the time of starting, and after the start is completed, the winding is changed to the Y (star) connection, thereby controlling the starting torque of the loom motor.

Further, when the loom machine angle at the time of starting the loom fluctuates, the time from the start of the loom motor to the first beating operation changes, and the initial beating force fluctuates, and a starting stage may occur.
Therefore, a technique for optimally controlling the starting torque of the loom motor corresponding to the loom machine angle at the time of starting the loom has already been proposed (Japanese Utility Model Publication No. 62-45015).

According to the related art, when there is a load change in which a plurality of picks are a repetition unit, such as an opening pattern or terry motion, one cycle of the load change pattern (hereinafter, referred to as one repeat). Depending on which pick number of the loom is used to start the loom, there is an unavoidable possibility that a starting stage will occur. Conventional technologies simply realize a constant large starting torque or control the starting torque in accordance with the loom mechanical angle at the time of starting the loom. This is because the influence of the fluctuation was not considered at all.

Therefore, an object of the present invention is to provide a control method for selecting the starting torque of a loom motor by focusing on a pick number within one repeat of a load fluctuation pattern of a loom at the time of starting in view of the situation of the related art. It is an object of the present invention to provide a method of starting a loom, which can effectively prevent generation of a start stage even when the loom is started from a number, and a device therefor.

Means for Solving the Problems In order to achieve the above object, the configuration of the first invention according to this application is for starting a loom in which a load periodically fluctuates according to a load fluctuation pattern in which a fixed number of picks is one repeat. The gist of the present invention is to selectively control the starting torque of the loom motor in accordance with the pick number within one repeat of the load fluctuation pattern at the time of starting, and to start the loom.

According to a second aspect of the present invention, a pick detecting section for detecting a pick number within one repeat of a load variation pattern of a loom, and a starting torque of a loom motor are selectively controlled in accordance with the pick number from the pick detecting section at the time of starting. The gist of the present invention is to include a torque control unit and a motor drive unit that starts a loom motor in accordance with a control signal from the torque control unit.

The torque control unit can selectively control the starting torque of the loom motor based on the load data of the loom motor stored for each pick number from the pick detection unit.

Further, the torque control unit may select and control the starting torque of the loom motor in accordance with the opening pattern from the dobby device at the time of starting, instead of the pick number from the pick detecting unit.

According to the first aspect, the starting torque of the loom motor is selectively controlled in accordance with the pick number within one repeat of the load fluctuation pattern at the time of starting, and is set to an optimum value for the load for each pick number. Therefore, for example, when the load on the loom fluctuates periodically due to the opening pattern of the heald frame, terry motion, etc., even if the loom is started from any pick number in one repeat, there is a possibility that a start stage will occur. Can be suppressed.

The method of controlling the starting torque of the loom motor involves changing the voltage frequency ratio (so-called V / f ratio) and the load current limit value of the inverter device for the loom motor driven via the inverter device. For example, it is conceivable to switch the starting voltage of the loom motor using a tap transformer for the loom motor that does not use the inverter device.

According to the second aspect, the pick detection unit detects the pick number within one repeat of the load variation pattern, and the torque control unit selectively controls the starting torque of the loom motor in accordance with the pick number at startup. As a whole, the first invention can be easily implemented.

The torque control unit selectively controls the starting torque based on the load data of the loom motor stored for each pick number in one repeat of the load variation pattern, so that when the loom starts, the load data immediately before the stop is used. This can be reflected in the starting torque of the motor, so that it is possible to appropriately cope with, for example, a case where the loom load gradually changes due to the progress of weaving.

In addition, the torque control unit can deal with a periodic fluctuation of the loom load caused by the opening pattern by selectively controlling the starting torque in accordance with the opening pattern from the dobby device at the time of starting.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

The starting device of the loom includes the pick detection unit 10, the torque control unit 2,
0, comprising a motor drive unit 30 (FIG. 1).

The pick detection unit 10 is formed by disposing the proximity switches 11a and 11b near the main shaft MS of the loom, and cascading a step signal generation unit 12 and a counter 13. That is, the spindle MS
Proximity switches 11a and 11b are provided so as to face the action piece MS1 protruding from the
Input to the counter, the step signal generator 12
13, a forward rotation pulse signal Sp1 and a reverse rotation pulse signal Sp2 can be output. However, the forward rotation pulse signal Sp1 and the reverse rotation pulse signal Sp2 indicate the pick timing when the loom is rotating in the forward rotation direction and the reverse rotation direction, respectively, and the counter 13 outputs the forward rotation pulse signal Sp1 and the reverse rotation pulse signal Sp1. This is a reversible counter that inputs Sp2.

The output of the pick detection unit 10 is connected to a motor drive unit 30 via a torque control unit 20. In the motor drive unit 30,
The loom motor M is connected, and a start signal St from a loom control circuit (not shown) is input.

Now, assuming that the loom load periodically fluctuates with n picks as a repetition unit (FIG. 2), one repeat of the load fluctuation pattern at this time includes n picks.

On the other hand, the step signal generator 12 of the pick detector 10 is
Forward rotation pulse signal Sp1 and reverse rotation pulse signal Sp2 for each rotation of
, The counter 13 counts them forward or backward to obtain the pick number i within one repeat.
(I = 1, 2,... N) can be detected. That is, when the content of the count is the number M,
B of M = an + b (where a is an integer and b ≦ n is a remainder) may be output as the pick number i.

When the pick number i within one repeat of the load variation pattern is given from the pick detecting section 10 in this way, the torque control section 20 outputs a control signal Sc to the motor driving section 30 corresponding to the pick number i. . Therefore, the motor drive unit 30
When the start signal St is present, the loom motor M can be started by selecting the operation parameters of the loom motor M so that the start torque corresponding to the control signal Sc is obtained. That is,
The torque control unit 20 outputs a control signal Sc for selectively controlling the starting torque of the loom motor M in response to the pick signal i at the time of starting, and the motor driving unit 30 starts the loom motor M according to the control signal Sc. .

The motor drive unit 30 includes, for example, contactors MCo and MCm,
Tapped transformers T, T and contactor MCj (j =
1, 2... K) (FIG. 3). The transformers T, T are V-connected, the primary side is connected to power supplies R, S, T via the contacts of the contactor MCo, and the secondary side is a tap Vj (j = 1, 2,
.. K) are connected to the loom motor M via the respective contacts of the contactor MCj. The contact point of the contactor MCm is directly connected to the loom motor M from the primary side of the transformers T, T, bypassing the transformers T, T. Via a contactor driving circuit (not shown), the contactor MCo is turned on by the start signal St, and one of the contactors MCj is selectively turned on by the control signal Sc from the torque control unit 20,
The loom motor M is started by a starting voltage corresponding to an arbitrary tap Vj of the transformers T, T, and can realize an arbitrary starting torque.

When starting the loom motor M, the torque control unit 20 finds the load Pi (i = 1, 2,... N) of the load variation pattern corresponding to the pick number i from the pick detection unit 10 (second
FIG.), The control signal Sc may be determined by the load Pi. The load fluctuation pattern is stored in the torque control unit 20 in advance. However, instead of storing the load fluctuation pattern, the torque control unit 20 may directly associate the control signal Sc with the pick number i.

In general, the load Pi changes arbitrarily according to the pick number i, but the contactor MCj, the transformer T, and the tap Vj of the T
The number k of satisfies k≪n. This is because the same tap Vj can be shared and used for a load Pi within a certain width. Of course, k ≒ n may be set if necessary.
Further, after the start of the loom motor M, the contactor MCj corresponding to the tap Vj is released, the contactor MCm is turned on, and the operation is shifted to the steady operation.

It should be noted that the transformers T, T may be a connection other than the V connection, and may be an automatic transformer instead of the insulating transformer.

Another Embodiment A dobby device 40 is interposed between the pick detection unit 10 and the torque control unit 20 (FIG. 4), and the torque control unit 20 corresponds to an opening pattern from the dobby device 40 at the time of startup. Thus, the starting torque of the loom motor M can be selectively controlled.

The dobby device 40 includes an opening pattern storage unit 41, a pattern read control unit 42, and a drive unit 43. The pattern read control unit 42 receives the pick number i from the pick detection unit 10.
In response to this, the heald frame HF can be driven to a predetermined opening pattern by reading out the opening pattern stored in the opening pattern storage unit 41 via the driving unit 43.

On the other hand, the torque control unit 20 is configured by cascading a load determination unit 21 and a starting current selection unit 22. Therefore, the load judgment unit
21 inputs the current opening pattern from the pattern read control unit 42 of the dobby device 40, and in response thereto, outputs a start current control signal Sci via the start current selection unit 22 to the motor drive unit 3.
Output to 0. However, the motor drive unit 30 uses an inverter INV interposed between the power supply AC and the loom motor M.

When the opening pattern of the heald frame HF changes with a repetition cycle of n picks, the loom load also draws a load variation pattern in which n picks are repeated. Therefore, the load judgment unit 21
When starting, the load Pi at that time can be found from the opening pattern corresponding to the pick number i from the pick detection unit 10, and the starting current selection unit 22 generates the control signal Sci corresponding to the load Pi. be able to. Therefore, the inverter INV can limit the starting current of the loom motor M according to the control signal Sci and control the starting torque.

In general, the dobby device 40 often has a built-in counter for detecting the pick number i in one repeat of the opening pattern. Therefore, pick detector 10
The counter 13 may be omitted and the counter built in the dobby device 40 may be shared.

The torque control unit 20 may be configured by cascading a data storage unit 23, a data read control unit 24, and a starting current selection unit 22 (FIG. 5). The output of the power transducer W is input to the data storage unit 23 via the hold circuit Wa.
The sampling signal Ss is input to the hold circuit Wa. However, the power transducer W is assumed to detect the power consumption P of the loom motor M by inputting the voltage V and the current I of the inverter INV that drives the loom motor M, and the current I is detected via the current transformer CT. Have been.

The counter 13 of the pick detection unit 10 has a preset circuit 13
A one repeat setter 13a is provided via b. The pick number i from the pick detection unit 10 is branched and input to the preset circuit 13b, the data storage unit 23 of the torque control unit 20, and the data read control unit 24.

The 1 repeat setter 13a sets the number n of picks forming one repeat of the load variation pattern. The preset circuit 13b sends a preset pulse Sp to the counter 13 when the pick number i is i = n. Send out. The counter 13 counts the forward and reverse rotation pulse signals Sp1 and Sp2 in the forward and reverse directions each time the input is performed. Therefore, the content of the counter 13 is the pick number i within one repeat of the load fluctuation pattern.
Always matches. However, the counter 13 is reset to 1 by the forward rotation pulse signal Sp1 immediately after the generation of the preset pulse Sp, and is forcibly reset to n when the counter 13 becomes zero by the reverse rotation pulse signal Sp2.

On the other hand, the hold circuit Wa holds the output of the power transducer W at the time when the sampling signal Ss is generated, and sends the output to the data storage unit 23. Therefore, the data storage unit 23 stores the sampling signal corresponding to the pick number i.
The load Pi at the time of occurrence of Ss can be stored and updated. However, it is assumed that the sampling signal Ss is output at a predetermined fixed time point in the loom cycle for each pick of the loom.

When the loom is started, the data read control unit 24 responds to the pick number i from the pick detection unit 10 and stores the data in the data storage unit.
Since the load Pi is read out from the loom 23 and sent to the starting current selecting section 22, the loom motor M
Can be selectively controlled.

The sampling signal Ss is, for example, the main shaft of the loom.
What is necessary is just to give to the hold circuit Wa for every predetermined loom mechanical angle based on the output of the encoder not shown connected to MS.

In storing the load Pi corresponding to the pick number i, the data storage unit 23 in FIG. 5 changes the generation timing of the sampling signal Ss input to the hold circuit Wa, so that the power consumption at any time during the loom cycle is P can be stored. For example, the sampling signal Ss
If the timing of occurrence of the loom coincides with the time of warp shedding or beating, it is easy to store the peak value of the loom load.

Further, the data storage unit 23 may store and update the load Pi composed of an average value of a plurality of pick operations for each pick number i. Further, when the voltage V of the inverter INV is constant in the steady operation, the power transducer W
May be replaced with a current transducer that detects only the current I. That is, the data storage unit 23 stores the pick number i
May be stored and updated as load data of the load Pi or current of the loom motor M corresponding to.

Further, for the data read control unit 24 or the storage unit 23,
By inputting a signal indicating the length of time after the loom is stopped, a signal indicating the bearing temperature of the loom, and the like, and correcting the load data stored in the data storage unit 23, the bearing is cooled by stopping the loom. By compensating for an increase in the required starting torque, the starting torque of the loom motor M can be determined more accurately.

In the above description, the motor drive unit shown in FIGS.
30 may use, for example, a voltage switching circuit as shown in FIG. 3 in place of the inverter INV. In this case, the contactor MCj may be selectively turned on by the control signal Sci. Further, the inverter INV may control the voltage frequency ratio (V / f ratio) at the time of starting, instead of controlling the starting current of the loom motor M by the control signal Sci.

Effects of the Invention As described above, according to the first invention of the present application, the starting torque of the loom motor is selectively controlled in accordance with the pick number within one repeat of the load fluctuation pattern at the time of starting, and the loom is controlled. Since the motor can be started with the optimum starting torque that matches the loom load at the time of starting, when the loom load fluctuates greatly due to the opening pattern, terry motion, etc.,
Regardless of which pick number the loom is started with, there is an excellent effect that the generation of the start stage can be effectively prevented.

According to the second aspect, by including the pick detection unit and the torque control unit, the torque control unit can select and control the optimal start torque corresponding to the pick number from the pick detection unit at the time of start, As a whole, the first invention can be easily implemented.

[Brief description of the drawings]

1 to 3 show an embodiment, FIG. 1 is an overall system diagram, FIG. 2 is an explanatory diagram of a load fluctuation pattern, and FIG. 3 is a connection diagram showing an example of a motor drive unit. FIG. 4 and FIG. 5 are general system diagrams showing different embodiments. M: Loom motor Sc, Sci: Control signal i: Pick number 10: Pick detection unit 20: Torque control unit 30: Motor drive unit 40: Dobby device

Claims (4)

(57) [Claims] When a loom in which a load periodically fluctuates in accordance with a load fluctuation pattern in which a fixed number of picks is one repeat is started, the loom motor corresponds to a pick number in one repeat of the load fluctuation pattern at the time of start. And starting the loom by selectively controlling the starting torque of the loom. 2. A pick detecting section for detecting a pick number within one repeat of a load fluctuation pattern of a loom, and a torque for selectively controlling a starting torque of a loom motor corresponding to the pick number from the pick detecting section at the time of starting. A starting device for a loom, comprising: a control unit; and a motor drive unit that starts a loom motor in accordance with a control signal from the torque control unit. 3. The loom motor according to claim 2, wherein said torque control section selectively controls a starting torque of the loom motor based on load data of the loom motor stored for each pick number from said pick detecting section. 3. The starting device for a loom according to claim 2. 4. The torque control unit selectively controls a starting torque of a loom motor in accordance with an opening pattern from a dobby device at the time of starting, instead of a pick number from the pick detecting unit. 3. A starting device for a loom according to claim 2.