JPH08260332A - Intermittent feeding apparatus for nonwoven cloth manufacturing machine - Google Patents

Abstract

PURPOSE: To provide an intermittent feeding apparatus for a nonwoven cloth manufacturing machine enabling accurate intermittent feed of various webs having different thickness with allowance using a small-sized lightweight feed motor. CONSTITUTION: Fibers constituting a web 16 are entangled with each other by vertically reciprocating a needle plate 12 with a crank shaft 3B. In a nonwoven cloth manufacturing machine having the above mechanism, a sensor 19 for detecting the extraction of the needle from the web and the separation of the needle from the lower face of a stripper is attached to a stripper 18 having vertically adjustable position for squeezing the needle 13 with the web in the extraction of the needle. The rotational angle of the crank shaft is read by a rotational angle detector 11 upon receipt of the detection signal transmitted from the sensor 19. The rotational speed of a feed motor 23 to feed a prescribed length of the web during the time to rotate the detected rotational angle is calculated from the above data. Delivery rollers 22A, 22B are intermittently driven by the NC-controlled feed motor 23 according to the sensor signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric intermittent feeding device for intermittently feeding a web of a nonwoven fabric manufacturing machine.

[0002]

2. Description of the Related Art Conventional intermittent feed devices for non-woven fabric manufacturing machines include a mechanical type using a stroke shaft motor as a drive source and a unidirectional cam clutch and a brake, and a preset feed type using a single feed motor. There was an electric type that sent the quantity.

[0003]

The mechanical intermittent feed device described in the prior art is inaccurate in setting the feed amount and difficult to adjust, and moreover, the mechanical structure of the drive system is complicated and the maintenance frequency is high. There is a problem that the feed amount is likely to be unstable due to wear of the clutch, brake, etc., and further the feed cannot be independently driven.

Further, in the electric intermittent feeding device, since the drive timing of the feed motor is constant, the maximum feed amount is limited by the maximum thickness of the web, so that the feed motor always accelerates to the maximum speed, so that the motor load is increased. It has the problem of being large.

The present invention has been made in view of the above problems of the prior art, and its object is to change the driving timing according to the thickness of the web to perform accurate intermittent feeding. It is an object of the present invention to provide an intermittent feeding device which can reduce the size and weight of a feed motor, has a simple structure, and has good operability.

[0006]

In order to achieve the above-mentioned object, a web feeding device of a non-woven fabric manufacturing machine according to the present invention is configured to move a needle plate up and down by a crank shaft to pierce a web with a needle to form fibers constituting the web. In a web device of a non-woven fabric making machine to be entangled, a NC control for driving a stripper provided to adjust the position vertically corresponding to the thickness of the web and a delivery roller for sending the web for each vertical movement of the needle plate. Of the feed motor, a sensor that detects that the needle is separated from the lower surface of the stripper, a detector that detects the rotational angle position of the crankshaft by the output signal of the sensor, and a rotational angle position of the detector. First calculation means for obtaining the rotation angle of the crankshaft capable of web feeding, and the time required to rotate the rotation angle are calculated from the rotation speed of the crankshaft. 2 calculation means, 3rd calculation means for obtaining the rotation speed of the feed motor necessary to feed the set amount of web in the calculated time, and calculation of the feed motor by the second calculation means from the time when the signal of the sensor is output. And a control means for intermittently rotating for a predetermined time.

[0007] In a web feeding device of a non-woven fabric manufacturing machine in which a needle plate is moved up and down by a crankshaft to pierce a web with a needle to entangle fibers forming the web, the position of the web can be vertically adjusted according to the thickness of the web. A stripper, a feed motor for driving a delivery roller that feeds the web every time the needle plate moves up and down, a means for setting a rotation time corresponding to a web feed amount of the feed motor, and the needle for the stripper. And a control means for intermittently rotating the feed motor for a set time by a signal from the sensor.

[0008]

According to the present invention, the sensor detects that the needle is separated from the lower surface of the stripper, that is, the needle is completely removed from the web, and the rotational angular position of the crankshaft at the time of outputting the sensor signal is detected. The rotation angle of the web-feedable crankshaft is calculated from the rotation angle position of the crankshaft, and the time required for turning the rotation angle of the web-feedable crankshaft is calculated from the rotation speed of the crankshaft. Determine the rotation speed of the feed motor for feeding the quantity of web. Then, the feed motor is intermittently rotated at the rotational speed obtained from the sensor output, and the time during which the needle is completely removed from the web is effectively utilized to perform the intermittent feed of the web.

According to a second aspect of the present invention, the sensor output detects that the needle has moved away from the lower surface of the stripper, and the web feed motor is intermittently rotated at a constant rotation speed for a time corresponding to the web feed amount. Intermittent feeding of the web is performed by automatically changing the start timing of the web.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an arrangement of a crankshaft of a non-woven fabric manufacturing machine and its drive system. Two crankboxes 1,
2 has two crankshafts 3A, 3B and 4A, 4 respectively
B is rotatably and parallelly supported, and rotation is transmitted between the crankshafts 3A, 3B and 4A, 4B by two gears 5 and 6 having the same number of teeth, and the crankshafts 3A, 4A and 3B. , 4B are couplings 7A, 7
They are connected by B respectively.

The crankshaft 3B is driven by a drive motor 8 via a synchro belt 9, and a rotation angle position detector 1 for detecting the rotation angle position of the crankshaft on the crankshaft 4B is provided.
1 is attached. The rotation angle position detector 11 sets the top dead center of the crank to 0, and 1/2 rotation at the time of forward rotation is +180.
Displayed in °, half rotation in reverse rotation is displayed in -180 °.

FIG. 2 is a view showing the crankshaft, the upper protruding needle plate portion and the web feeding portion of the nonwoven fabric manufacturing machine. Reference numeral 12 is an upper protruding needle plate in which a plurality of needles 13 are planted, which is fixed to the lower surface of the needle beam 14,
Reference numeral 4 is connected to the crankshaft 3B via a connecting rod 15.

Reference numeral 16 is a web which is an aggregate of fibers constituting the non-woven fabric, and 17 is a bed which serves as a base when the web is fed. Reference numeral 18 denotes a stripper for squeezing the web 16 when the needle 13 comes out of the web 16, which can be adjusted up and down according to the thickness of the web. Needle 1 for stripper 18
A contactless or contact type touch sensor 19 for detecting that the needle tip 3 has come out of the web and has left the stripper lower surface and outputs a signal is fixed, and the needle beam 14 is a dog for operating the touch sensor 19. Twenty are attached.

The space between the stripper 18 and the bed 17 is shown in FIG.
The web 16 is fed from the left side to the right side with a conveyor 21 for feeding the web 16 to the left side of the stripper 18, and delivery rollers 22A and 22B for pulling out the web 16 are rotatably provided on the right side.
It is adapted to be driven by a C-controlled feed motor 23 via a synchro belt 24.

As shown in FIG. 3A, the total stroke S of the needle plate 12 by the crankshaft 3B is such that the needle tip is the stripper 1.
8 is the sum of the distance L from the lower surface of 8 to the distance H between the lower surface of the stripper 18 and the upper surface of the bed 17, and the amount T of penetrating the bed 17 and projecting downward. Further, the locus of the needle tip with respect to the rotation angle of the crankshaft 3B draws a sine curve as shown in FIG.

In FIG. 3B, the rotation angle position θ of the crankshaft 3B when the needle 13 is at the rising end, and the rotation angle when the needle tip is separated from the lower surface of the stripper 18 by the forward rotation of the crankshaft. When the position is + θ1 and the rotation angle position when the needle tip is separated from the lower surface of the stripper 18 by the reverse rotation of the crankshaft is −θ1, the signal of the touch sensor 19 is preferably the rotation angle position of −θ1 or the upper side including −θ1. The position of the dog 20 is adjusted so that the output is within a slight allowable range.

Therefore, as shown in FIG. 3 (c), the time for rotating the rotation angle from -.theta.1 to + .theta.1 is the time zone during which the web can be fed, and the web 16 having the preset feed amount in this time zone. The rotation speed N including the acceleration / deceleration of the feed motor 23 that can feed the

FIG. 4 is a block diagram of an NC control system for controlling the rotation of the feed motor 23. Input section 2
Reference numeral 9 is a portion for inputting the web feed amount, and web feed amount storage unit 30 is a portion for storing the input web feed amount. The web feedable rotation angle calculation unit 31 reads the rotation angle position −θ1 output from the rotation angle position detector 11 when the touch sensor 19 outputs a signal, and multiplies this by 2 to obtain the web feedable rotation angle 2θ1. part. The web feed time calculation storage unit 32 is a unit that calculates and stores the time required to rotate the rotation angle 2θ1 from the rotation speed of the clamp shaft stored in advance. The on / off command unit 33 uses the touch sensor 19
Is a part for outputting an ON / OFF signal for driving the feed motor 23 for the web feed time.

The rotation speed calculation storage unit 34 delivers the delivery roller 2 by the rotation angle required to feed the web 16 by the feed amount stored in the web feed amount storage unit 30 during the web feed time.
A portion for calculating and storing a rotation speed including acceleration / deceleration of the feed motor 23 that rotates 0A. The speed command unit 35 is a unit that outputs a speed command such that the feed motor 23 rotates at a rotation speed including the obtained acceleration / deceleration. The motor drive section is a section that drives the feed motor 23 based on the speed command.

Next, the operation of this embodiment will be described. The web 16 sent by the conveyor 21 is the stripper 1
8 is punched downward from between the bed 17 and the bed 17, and is drawn by the delivery rollers 22A and 22B and sent to a device (not shown) for the next process outside the machine base.

The relationship between punching and web feeding is as follows.
First, the start signal is output, and the crankshafts 3B and 4B stopped at the top dead center (θ = 0) are rotated forward, the needle 13 pierces the web 16, and the needle tip comes out from the lower surface of the stripper 18 in the drawing process. The touch sensor 19 detects that the user has moved away, and outputs a signal. The rotation angle position detector 11 reads the rotation angle position (−θ1) of the crankshafts 3B and 4B by the signal of the touch sensor 19 to the web feedable rotation angle calculation unit 31.

The web feedable rotation angle calculation unit 31 obtains the web feedable rotation angle (2θ1) of the crankshafts 3B and 4B from the rotation angle position (−θ1), and the web feed time calculation storage unit 32 stores it in advance. The time required to rotate the rotation angle (2θ1) is calculated from the stored rotation speed of the crankshaft and stored, and only the feed amount stored in the web feed amount storage unit 31 is stored in the rotation speed calculation storage unit 34 at this rotation time. The rotation speed including the acceleration / deceleration of the feed motor 23 for feeding the web 16 is calculated and stored.

When a signal is output from the touch sensor 19 at the rotational angle position (-θ1) of the crankshafts 3B and 4B,
When the ON / OFF command unit 33 outputs an ON signal, the feed motor 23 is activated, the delivery rollers 22A and 22B start the web feed, and when the feed motor rotates for the time stored in the web feed time calculation storage unit 32, the OFF signal is output. The feed motor 23 stops and the web feed stops.

The feed amount of the web 16 is usually set to the same amount each time, but the feed amount is not necessarily limited to the equal amount, and if necessary for improving the quality of the manufactured nonwoven fabric, the feed amount may be increased. It is also possible to store a variable pattern of the amount and to feed the variable amount.

Further, in the above embodiment, the feed motor 23
Is a variable speed motor in order to correspond to the thickness and feed amount of the web 16, but a constant rotation speed motor similar to the conventional one is used to intermittently drive for a time corresponding to the web feed amount preset by the signal of the touch sensor 19. By itself, the thinner the web, the more time you can feed the web,
The maximum feed amount can be increased accordingly.

[0026]

Since the present invention is configured as described above, it has the following effects. According to the present invention, the drive timing of the feed motor is always from when the needle is detected to be separated from the lower surface of the stripper to immediately before passing through the lower surface of the stripper. Therefore, it is possible to cope with webs of various thicknesses during setup work. Even if the vertical position of the stripper is adjusted, it is possible to feed the web using the full web feed time at all times, and it is possible to perform accurate and easy-to-operate intermittent feed at a comfortable feed speed. Further, since the drive time of the feed motor can be set to the maximum corresponding to the thickness of the web, the feed motor can be made comfortable and the feed motor can be made compact and lightweight.

According to a second aspect of the present invention, the web feed start timing is automatically adjusted by adjusting the vertical position of the stripper corresponding to webs of various thicknesses during the setup work as an intermittent drive for starting the feed motor having a constant rotation speed by the sensor output. Since it is changed, the thinner the web, the earlier the start time point, and the larger the maximum web feed amount can be made.

[Brief description of drawings]

FIG. 1 is a top view configuration diagram of a stroke drive unit of a nonwoven fabric manufacturing machine according to an embodiment.

FIG. 2 is a front view showing a crankshaft, an upper protruding needle portion, and a web feeding portion of the nonwoven fabric manufacturing machine of this embodiment.

FIG. 3A is an explanatory view showing the relationship between the vertical movement of the needle and the web, and FIG. 3B is a development view of the trajectory of the needle tip due to the vertical movement.
(C) is a diagram showing the relationship between the rotational angle position of the crankshaft and the rotational speed of the feed motor.

FIG. 4 is a block diagram of an NC control system for controlling a feed motor.

[Explanation of symbols]

 3A, 3B, 4A, 4B Crankshaft 8 Crankshaft drive motor 11 Rotational angle position detector 12 Needle plate 13 Needle 14 Needle beam 16 Web 18 Stripper 19 Touch sensor 22A, 22B Delivery roller 23 Feed motor 31 Web feed possible rotation angle calculation unit 32 web feed time calculation storage unit 33 on / off command unit 34 rotation speed calculation storage unit 35 speed command unit

Claims (2)

[Claims] 1. A web feeding device of a non-woven fabric manufacturing machine, wherein a needle plate is moved up and down by a crankshaft to pierce a web with a needle to entangle fibers forming the web, and the web feeding device is positioned vertically depending on the thickness of the web. An adjustable stripper, an NC-controlled feed motor that drives a delivery roller that feeds the web every time the needle plate moves up and down, a sensor that detects that the needle has separated from the lower surface of the stripper, and A detector for detecting the rotational angle position of the clamp shaft based on the output signal of the sensor, and a rotational angle position of the crankshaft capable of web feeding from the rotational angle position of the detector.
Calculating means, and second calculating means for calculating the time required to rotate the rotation angle from the rotation speed of the crankshaft,
Third calculating means for obtaining the rotation speed of the feed motor required to feed the set amount of web in the calculated time, and intermittently for the time calculated by the second calculating means from the output of the signal from the sensor of the feed motor. An intermittent feeding device for a non-woven fabric manufacturing machine, comprising: 2. A web feeding device of a non-woven fabric manufacturing machine, wherein a needle plate is moved up and down by a crankshaft to pierce a web with a needle to entangle fibers constituting the web, and the web feeding device is positioned vertically depending on the thickness of the web. An adjustable stripper, a feed motor that drives a delivery roller that feeds the web every time the needle plate moves up and down, a means for setting a rotation time corresponding to a web feed amount of the feed motor, and the needle. An intermittent feeding device for a non-woven fabric manufacturing machine, comprising: a sensor that detects that the stripper is separated from the lower surface; and a control unit that intermittently rotates the feed motor for a set time by a signal from the sensor. .