JPS6358940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for shedding warp threads in a tapepet loom.

In a tapepet loom, a cam is attached to a rotating shaft that is linked to the crankshaft of the loom, and this cam moves the heald frame, which separates the warp threads into upper and lower parts according to their texture, using a lever or the like, and creates a desired opening in the warp threads. I am having them do this.

By the way, when opening the warp yarns, there are ways to open the warp yarns depending on the yarn type, such as the speed of movement of the heddle frame and the dwell length. Therefore, when the type of warp used for weaving changes, it is necessary to replace the cam each time with a cam having a cam diagram that matches the type of warp.

In addition, although the textile structure includes plain weave, twill weave, etc., in order to form an opening corresponding to the desired structure, it is necessary to move the heald frame in a predetermined order in accordance with the rotation of the loom. In this case, it is necessary to change the cam for each tissue, and at the same time, it is also necessary to change the rotation transmission device (particularly the speed reduction device) to the camshaft in accordance with the number of rotations of the loom for one cycle.

As described above, in the conventional device, whenever the yarn type or structure is changed, it is necessary to carry out the troublesome work of replacing and changing the cam, transmission device, etc. in order to obtain an appropriate opening pattern.

The present invention solves the various drawbacks of the conventional mechanical shedding method and device as described above, eliminates the need for multiple cams, and allows for the setting of warp shedding patterns.
It is an object of the present invention to provide a warp shedding method and device that can be easily changed. The gist of this invention is to use cams of the same shape as the cams that move the levers of the heald frame, and to realize the warp shedding pattern by appropriately controlling the rotation angle, rotation speed, and rotation direction of the cams. do.

The present invention will be described in detail below using embodiments shown in the accompanying drawings.

In FIG. 1, the input device 1 is a keyboard 1a.
and cathode ray tube (CRT)
This is a device for inputting a warp shedding pattern composed of warp threads 1b and 1b to a shedding pattern processing section 2. First, by pressing the keyboard 1a in a predetermined order, the aperture pattern information is input into the aperture pattern processing section 2. The aperture pattern processing section 2 is composed of a central processing unit (CPU) 21, a memory 22 consisting of a program memory section and a data memory section in which programs for instructing the operation of the CPU 21 are stored, and a data bus 23. The information is stored in a data memory section of memory 22. This aperture pattern information is also displayed on the cathode ray tube 1b by an appropriate method. Then, the display on the cathode ray tube 1b is compared with the desired aperture pattern, and the desired aperture pattern is determined interactively on the cathode ray tube 1b.
Build on b. Furthermore, this aperture pattern on the cathode ray tube 1b is inputted to the aperture pattern processing section 2 as a pattern signal S1.

The data memory section of the memory 22 stores information such as the lift amount of the master cam, which will be described later, and the aperture pattern processing section 2 processes the pattern signal S1 input from the input device 1 using a known method, which will be described later. Master cam drive pattern information, which is information for controlling the rotation of the master cam and is composed of a plurality of master cam drive instruction information, is output as a signal to the external memory 3. External memory 3 is nonvolatile RAM, RAM with power backup, or
A memory configured with a PROM or the like, which stores the input master drive pattern information.

In addition to the above, the external memory 3 may be a magnetic tape, a bubble memory, or other commonly used storage devices. Further, even when inputting the aperture pattern to the aperture pattern processing section 2, a magnetic tape, a leader tape, etc. can be used in addition to the keyboard 1a.

As described above, the drive pattern of the master cam is set according to the required opening pattern and the shape (lift amount) of the master cam, and after the storage of this information in the external memory 3 is completed, this information in the external memory 3 is A signal is input to the control section 4 as shown in FIG. The control unit 4 is composed of a memory 42 consisting of a program memory section and a data memory section in which the following operation instruction programs for the CPU 41 are stored, and a data bus 43, and master cam drive pattern information in the external memory 3. is data bus 43
The data is input to and stored in the data memory section of the memory 42 via.

The output of the crank angle detector 5 is input to the control section 4 . The crank angle detector 5 is composed of, for example, an absolute shaft encoder attached to the crankshaft of a loom.
Crank angle signal S5 indicating the crank angle of the loom
Output.

Further, the output of the control section 4 is input to the drive circuit 6. The drive circuit 6 controls the rotation of pulse motors 7a to 7n that command the vertical movement of the heald frame as described later, and its output signal (pulse signal) S6
a to S6n are input to each of the pulse motors 7a to 7n.

The master cam drive information stored in the data memory section of the memory 42 of the control section 4 is sequentially read out by the crank angle signal S5 from the crank angle detector 5, and the control section 4 uses this information as the drive instruction signal S4. Output. When this drive instruction signal S4 is input, the drive circuit 6 sends drive signals S6a to S6 to the pulse motors 7a to 7n, respectively, in response to this signal.
Outputs 6n.

Master cams 8a-8n are attached to the rotating shafts of the pulse motors 7a-7n. The master cams 8a to 8n are, for example, eccentric cams whose radius gradually changes with the angle, and have a maximum lift amount necessary and sufficient for vertical movement of the heald frame.

The master cams 8a to 8n do not need to all have the same shape, and it is sufficient if the master cams 8a to 8n have a lift amount that can ensure an opening amount that corresponds to the opening pattern. One end of these master cams 8a to 8n is supported by the heald frames 10a to 10n, and a lever 9 is used to direct the vertical movement of the master cams 8a to 8n.
It is in contact with the other ends of a to 9n. Although a pulse motor is used as the motor in this embodiment,
Other motors such as a DC motor can be used by passing the output of the drive circuit 6 through a DA converter or the like. In addition, although this explanation assumes that the motor (pulse motor in the example) is rotated only in one direction, the motor can be rotated by adjusting the polarity of the output from the control section as necessary. It can be rotated forward and backward.

In this embodiment having the above configuration, the operation of the loom is started and the crankshaft begins to rotate, and crank angle signals S5 are successively input from the crank angle detector 5 to the control section 4. Then, the CPU 41 of the control section 4 reads out the master cam drive pattern information stored in the memory 42 one after another. These pattern information are then output as a drive instruction signal S4 to the drive circuit 6 using a known method. Then, in response to this drive instruction signal S4, drive signals S6a to S6n are outputted from the drive circuit 6 to predetermined ones of the respective pulse motors 7a to 7n, and the corresponding cams 8a to 8n are operated in a predetermined manner according to the master cam drive pattern information. The heald frame is moved by rotating at a predetermined speed and a predetermined angle at the timing of
During the dwell, the master cams 8a to 8n are of course kept stationary for a predetermined timing as necessary.

As the master cams 8a to 8n rotate or stand still according to the master cam drive pattern information in this manner, the heald frame can be moved up and down via the levers 9a to 9n. Of course, the master cam drive pattern information is created and set according to the warp shedding pattern, so the heald frame at this time is adjusted up and down according to the shedding amount and shedding timing according to the warp shedding pattern. make a move.

In the above embodiment, the master cam drive pattern (information) is created by once inputting the warp shedding pattern (information) to the shedding pattern processing section 2, and this information is further transmitted to the control section using the external memory 3. 4, the program memory section of the memory 42 of the control section 4 is rewritten as appropriate, and necessary information such as the lift amount of the master cam is stored in a part of the memory area of the data memory section. The section 4 can have the function of the aperture pattern processing section 2. In this case, the master cam drive pattern information can be stored in the data memory section of the memory 42 by simply loading the aperture pattern (information) directly into the control section 4. Furthermore, even when creating a master cam drive pattern based on the warp shedding pattern and the shape of the master cam, it takes some time without using the shedding pattern processing section consisting of the CPU 21, memory 22, etc. as in the embodiment. However, the drive pattern can be created by simple calculation.

Furthermore, in the above explanation, the created drive pattern of the master cam is temporarily stored in the control section, but by using a bubble cassette or floppy disk as the external memory, these storage devices can be simply stored in the control section. It is possible to cause the control section to perform the same operation and output the drive instruction signal by simply connecting the control section to the control section.

Furthermore, in the embodiment, a motor is attached to each of the heald frames, and each of these motors is caused to output a signal from the drive circuit, but for example, for heald frames with the same opening pattern, the output signal from the motor or the drive circuit may be shared. You can.

As described above, according to the present invention, it is possible to use a single-shaped cam for all the cams that come into contact with the lever that supports the heald frame, so unlike the conventional method, a large number of different-shaped cams are prepared. There is no need to do this, and the manufacturing cost of the cam can be kept low. In addition, in this invention, the rotation angle of the master cam is adjusted according to the crank angle of the loom.
Alternatively, all warp shedding patterns can be achieved by controlling the rotational speed, making it easy to set or change the warp shedding pattern, eliminating the hassle of changing the cam mounting position or replacing the cam itself, as required in the past. This eliminates the need for time-consuming work and improves work efficiency. Furthermore, since it is sufficient to prepare one cam for each heald frame, the drive mechanism for the heald frame can be made very simple.

Another effect is that when you want to partially correct or change the shedding pattern, including the shedding amount, etc. during trial weaving, you can interactively use the input device such as a keyboard and display output device (not shown) on the loom. Since this can be easily done by changing the contents of the memory 42 above, there is an advantage that tests and examinations of weaving conditions can be carried out quickly. Therefore, compared to the conventional method of designing and manufacturing each cam to make a slight change in the aperture pattern, the speed at which differentiated products with high added value can be developed becomes much faster.
The aperture pattern completed in this way can also be written out to a printer (not shown) or stored in an external memory.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of creating a master cam drive pattern in this invention.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1... Input device, 2... Aperture pattern processing section, 3...
External memory, 4... Control unit, 5... Crank angle detector, 6... Drive circuit, 7a to 7n... Pulse motor,
8a to 8n...Master cam, 10a to 10n...Heald frame, 21, 41...Central processing unit, 22, 42...
memory.

Claims (1)

[Scope of Claims] 1. In a loom of a type in which warp threads are shedding by vertically moving a heald frame with a cam via a lever or the like, a cam drive pattern is created according to the warp thread shedding pattern and the shape of the cam; The drive pattern is stored by the control unit 4 comprising a central processing unit 41 and a memory 42, and read out sequentially according to the crank angle of the loom and output as a drive instruction signal S4, and the drive pattern is outputted as a drive instruction signal S4. A warp shedding method in a tapepet loom, characterized in that the rotation of a cam is controlled using an instruction signal. 2. In a type of loom where the warp threads are shedding by moving the heald frame up and down with a cam via a lever etc., the crank angle of the loom is detected and a crank angle signal S is generated.
5, a central processing unit 41 and a memory 42 in which a cam drive pattern determined by the warp shedding pattern and the cam shape is stored; A control section 4 which inputs a signal and outputs a drive instruction signal S4; and a control section 4 which inputs the drive instruction signal and outputs a drive instruction signal S6a~
It has a drive circuit 6 which outputs S6n, and motors 7a to 7n, each of which has cams 8a to 8n attached to its rotating shaft for driving the heald frame, and which receives the drive signal and rotates according to the drive pattern. A warp shedding device for a tapepet loom, characterized by comprising: