JP2777740B2 - Loom cutter device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a cutter device for a loom.

[Conventional technology]

In Japanese Utility Model Publication No. 1-7740, an appropriate contact pressure is applied between a pair of shear-type blades, that is, a fixed blade and a movable blade, by using a repulsive force of an electromagnet. When a rotary actuator or the like is used as a drive source for a cutting operation in such a cutter device, it is advantageous in that timing control is easy.

[Problems of the prior art]

However, in the case of a driving method such as a rotary actuator, two electromagnetic force generating means for applying a contact pressure and for performing a cutting operation are required, and the structure becomes complicated, and the magnetic forces of the two interfere with each other. , Operation is likely to be unstable.

[Object of the invention]

Therefore, an object of the present invention is to use a magnetic force generating means for applying a contact pressure to a movable blade and a magnetic force generating means for a cutting operation, to simplify the structure and to ensure the operation.

[Solution of the Invention]

To achieve the above object, the present invention provides a permanent magnet attached to a shaft, which supports a movable blade so as to be able to swing by a shaft with respect to a fixed blade of a shearing type, and is also displaceable in the direction of the center line of the shaft. Is driven by an exciting coil and its control unit. Here, the magnetic force acting center of the rotor is attached to the shaft in a state of being displaced in a direction opposite to the direction of the pressing force acting with respect to the magnetic flux center of the exciting coil.

[Function of the invention]

The control unit determines the timing of the cutting operation in relation to the crank angle of the loom, and applies an appropriate current to the exciting coil in both directions. With this, the exciting coil draws the rotor by magnetic force, brings the movable blade into contact with the fixed blade with an appropriate pressure contact force, and applies a rotational force in the reciprocating direction to the rotor, thereby giving a swinging motion and cutting. We will proceed with the operation. Here, the exciting current of the exciting coil is switched to a preset value for each reciprocating stroke of the swing for the cutting operation or in synchronization with the type of weft in the case of multicolor weft insertion.

〔Example〕

1 to 3 show the configuration of the cutter device 1 for a loom.

As shown in FIGS. 1 and 2, the loom cutter device 1 is assembled by a pair of shear-type fixed blades 2, movable blades 3, a rotary solenoid 4 for driving them, and a control unit 5.

The fixed blade 2 is fixed to, for example, a casing 6 of a rotary solenoid 4, and the movable blade 3 is supported by a shaft 7 of the rotary solenoid 4 at a position facing the fixed blade 2 so as to be swingable. ing. The shaft 7 is movable in the direction of the center line inside a support means, for example, two cylindrical sliding bearings 8, and is moved by two ball bearings 9.
The casing 6 is supported so as to be swingable around the center line of the shaft 7 and has a rotor 10 made of a permanent magnet having a polarity as shown in the drawing. Here, the magnetic force acting center of the rotor 10 is attached to the shaft while being displaced in a direction opposite to the acting direction of the pressing force with respect to the magnetic flux center of the exciting coil 12. The swing angle of the movable blade 3 is regulated by a pair of stoppers 31 and 32 within an angle required for cutting. On the other hand, the casing 6 also serves as a yoke, forms a pair of magnetic poles 11 inside, and has an exciting coil 12 at that portion.

Next, as shown in FIG. 3, the control unit 5
, A comparator 17 connected to an external shaft encoder 16 to set the timing of the cutting operation according to the rotation angle of the crankshaft 15 of the loom. , A cutting operation timing setting device 18 and a driver 19, as well as an external weft selecting device
Assembled by switches 22, 23 for switching the selection setter 21 on the output side of the power supply 13 according to the output of the comparator 20 and the output of the comparator 17, selection switches 24, 25, and the like.

For example, the selection switch 25 is set to the off state in the case of one-color weft insertion, and when the contact pressure of the movable blade 3 with respect to the fixed blade 2 is changed between the start and the return of the cutting operation, the selection switch 25 is set. 24 is set to the ON state. During weaving, the shaft encoder 16 detects the rotation angle of the crankshaft 15 and sends an angle signal to the comparator 17. Thus, as shown in FIG.
During rotation, over the standby period set by the timing setting device 18, the output of the switching device 22 causes the output voltage Va to be output from the power source 13 by the selection setting device 21 by the output of the selection setting device 21. The current is flowing in the direction. As a result, the exciting coil 12 draws in the direction in which the magnetic force acting center of the rotor 10 coincides with the magnetic flux center of the exciting coil 12 by the magnetic force, thereby bringing the movable blade 3 into contact with the fixed blade 2 with a relatively small contact pressure. The shaft 7 is displaced in the direction of the standby position, and the movable blade 3 is released from the fixed blade 2. Thereafter, when the crankshaft 15 enters the period of the cutting operation, the comparator 17 causes the selection setting device 21 to output the largest drive voltage Vc via the switching device 22 and the switching switch 14 via the driver 19. Is switched to determine the polarity of the voltage applied to the exciting coil 12, so that the exciting current flows in the direction of arrow F. At this time, the exciting coil 12 presses the movable blade 3 against the fixed blade 2 with a magnetic force even stronger than the output voltage Va, and at the same time, gives a rotational movement in the cutting direction of the shaft 7 so that the fixed blade 2 and the movable blade 3 And a shear force is applied to cut the weft yarn. When this disconnection is completed and the return period is entered, the comparator 17
Causes the selection setter 21 to output an intermediate output voltage Vb as an ON state via the switch 22, return the changeover switch 14 to the same state as the standby state by the driver 19, and give the shaft 7 a return rotation. . At this time, the rotor 10 makes the contact pressure of the movable blade 3 with the fixed blade 2 lower than at the time of the cutting operation, and makes the movable blade 3 stand by at a relatively low speed with a torque smaller than the torque at the time of cutting. return. In this way, the pair of fixed blades 2 and movable blades 3 complete the cutting operation associated with one swinging motion, cut the weft thread after weft insertion, and enter the standby state again.

As described above, since the output voltages Va and Vb are set to values smaller than the output voltage Vc at the time of disconnection during the return operation and the standby period, the wear at the rubbed portion between the fixed blade 2 and the movable blade 3 is reduced. , To a minimum. Of course, the excitation voltage Vb during the return period may be set to the excitation voltage Va.

In the case of multi-color insertion, for example, two colors, the selection switch 25 is set to the ON state and the selection switch 24 is set to the OFF state. The weft selecting device 20 outputs a selection signal specific to the selected weft to the switching device 23, and the selection setting device
By selectively switching 21 as shown in FIG.
Output transfer pressure V suitable for weft cutting in synchronization with the selection order
1, V2 is selectively output, and the excitation coil 1
Drive 2 Therefore, the contact pressure of the movable blade 3 with respect to the fixed blade 2 is automatically set to an optimum value according to the two-color weft insertion.

[Other embodiments]

The embodiment shown in FIG. 6 is an example in which the driven blade 32 and the driving blade 33 of the rotary shearing type are continuously rotated by the motor 34 during weaving. On the other hand, the driving blade 33 is rotatably supported by the shaft 7 of the motor 34, and the driven blade 32 is also rotatably supported by the shaft 35, and rotates negatively or in contact. The exciting coil 12 of the magnetic pole 11 generates a rotating magnetic field to rotate the rotor 10. Therefore, the control unit 5 includes a known motor driver, and the power supply 13
And the selection setting device 21.

In the above embodiment, two switching devices are provided inside the control unit 5.
22 and 23 are provided to change the output voltage value of the power supply 13, and such control is provided as needed. Further, in the above embodiment, for convenience of explanation, the two switching units 22 and 23 are selectively operated, but these two switching units 22 and 23 can be simultaneously operated. For example, at this time, the excitation voltage Va1, Va2, Vb,
Vc is set in advance, and the excitation voltage Va1, Vb, Vc or the excitation voltage Va is set based on the output of the switch 22 and the switch 23.
2, Vb and Vc may be sequentially selected at a predetermined timing by the selection setting unit 21.

〔The invention's effect〕

 According to the present invention, the following specific effects can be obtained.

Since the excitation coil of the rotary solenoid is used not only as a drive source for giving a swinging motion to the movable blade, but also as a pressure contact force source for rubbing the fixed blade against the movable blade with a predetermined contact pressure, cutting operation and The magnetic force generating means for applying the contact pressure does not become complicated, and the interference between the magnetic forces when the exciting coil for the cutting operation and the exciting coil for the contact pressure are separately installed is eliminated, and the cutting operation is ensured. .

The excitation current value of the excitation coil is selectively switched according to each step of the cutting operation, or set to a current value appropriate for the type of weft yarn according to the weft insertion sequence from the weft yarn selection device. Since the contact pressure between the fixed blade and the movable blade can be set to an optimum value according to the mode or the type of the weft, the most appropriate and stable cutting function during operation of the loom can be secured for a long period of time.

[Brief description of the drawings]

1 is a horizontal sectional view of a cutter for a loom, FIG. 2 is a vertical sectional view of a portion of a rotary solenoid, FIG. 3 is a block diagram of a control unit, and FIGS. 4 and 5 are waveform diagrams of output voltages. FIG. 6 is a vertical sectional view of another embodiment. DESCRIPTION OF SYMBOLS 1 ... Cutter device for loom, 2 ... Fixed blade, 3 ... Movable blade, 4 ... Rotary solenoid, 5 ... Control unit, 6 ...
Casing, 7 ... shaft, 8 ... sliding bearing, 9 ... ball bearing, 10 ... rotor, 12 ... exciting coil, 13 ... power supply,
14 ... Changeover switch, 16 ... Shaft encoder,
17 ... Comparator, 20 ... Weft selecting device, 21 ... Selection setting device, 22, 23 ... Switcher, 24 ... Selection switch.

Claims (4)

(57) [Claims] An oscillating shearing fixed blade and a movable blade, a shaft for supporting the movable blade in a swingable state, and the shaft being slidably movable and displaceable in the direction of the center line of the shaft. And a control unit for switching the direction of the exciting current in accordance with the timing of the cutting operation. A magnetic force acting center of the rotor is displaced in a direction opposite to a direction in which a movable blade presses against a fixed blade with respect to a magnetic flux center of the loom. 2. A rotary shearing driven blade and a driving blade, a shaft for supporting the driving blade in a rotatable state, and a supporting means for rotatably supporting the shaft so as to be displaceable in the direction of the center line of the shaft. And a rotor made of a permanent magnet attached to a shaft, an exciting coil for giving a rotational motion to the rotor, and a control unit for switching the direction of the exciting current according to the timing of the cutting operation. A cutter device for a loom, characterized in that the center of action of the magnetic force of the rotor is displaced in the direction opposite to the direction of action of the pressing force of the drive blade against the driven blade. 3. The cutter device for a loom according to claim 1, wherein a switch for switching an exciting current value according to a timing of a cutting operation is incorporated in the control unit. 4. The loom cutter device according to claim 1, wherein a switch for switching an exciting current value in accordance with a weft yarn selection signal is incorporated in the control unit.