JP7191502B2 - Thread rubber cut detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technique for detecting breakage of rubber thread.

Conventionally, various methods have been proposed for detecting yarn breakage in the manufacturing process. For example, in Patent Document 1, a fiber bundle discharged into a coagulation bath is irradiated with a line laser, photographed with a camera installed at a specific position, and analyzed using an image processing device. A technique is disclosed for identifying at which position on the surface of a spinning nozzle a single yarn breakage has occurred.

JP 2016-44382 A

The present invention relates to a novel invention relating to a device for detecting breakage of rubber thread.

In order to solve the above-mentioned problems, the inventors of the present application have proposed a rubber thread contact portion that is hooked by a rubber thread stretched in the air so as to maintain a constant relative position in a device other than the extending direction of the rubber thread, and a rubber thread. an extension direction movement regulating portion that restricts the contact portion from moving in the extension direction of the rubber thread; a biasing portion that biases the rubber thread contact portion in a direction other than the extension direction of the rubber thread; A detection unit that detects that the rubber thread contact portion is moved by the biasing portion, and a rubber thread that detects that the rubber thread contact portion has moved in a predetermined direction by a predetermined amount or more when the rubber thread is cut. They have found a rubber thread break detection device provided with a judging section for judging that the rubber thread has been cut.
In the above configuration, the detection unit detects the speed at which the rubber thread contact portion is moved by the biasing unit, and the determination unit moves the rubber thread contact portion in the predetermined direction by the biasing unit when the rubber thread is cut. Also found is a rubber thread break detection device that determines that the rubber thread has been cut when it is detected that the rubber thread has moved at a predetermined speed or higher.

ADVANTAGE OF THE INVENTION According to this invention, the apparatus which can detect the cutting|disconnection state of rubber thread favorably can be provided.

1 is an explanatory diagram showing a configuration of a disconnection detection device 100; FIG. FIG. 11 is an explanatory diagram showing a state in which five disconnection detection devices 100b are arranged; FIG. 10 is an explanatory diagram showing a state in which the disconnection detection device 100c is arranged;

Hereinafter, the form for carrying out this case is demonstrated. The following embodiments are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described in these embodiments. Each configuration of this embodiment can be modified in various ways without departing from the gist thereof. In addition, they can be selected as necessary, and can be combined as appropriate.

A1. Arrangement and Configuration of Disconnection Detection Device 100:
FIG. 1 is an explanatory diagram showing the configuration of the disconnection detection device 100. As shown in FIG. In FIG. 1, the upper side of the drawing is the vertical upper side and the lower side of the drawing is the vertical lower side (gravitational direction). The cutting detection device 100 includes a first frame 110, an arm 120, a hook 130 (thread rubber contact portion), a rotating shaft portion 140, a second frame 170, a proximity sensor 180 (detection portion), and a third frame. 190 and. The arm 120 may be cantilevered on the first frame 110 as shown in FIG. 1, or may be both-supported. FIG. 2 shows a state viewed from the left side of FIG. 1, and since the five cutting detection devices 100b arranged side by side are supported by a cantilever on the first frame 110, each width ( lateral length) can be reduced. Further, as shown in FIG. 3, two first frames 110 and one rotating shaft portion 140c may support a plurality of (five in the figure) cutting detection devices 100c.

The first frame 110 rotatably supports the arm 120 via the rotating shaft portion 140 . A hook 130 is fixedly connected to one end of the arm 120 . The other tip of the arm 120 (the end of the arm 120 on the side where the hook 130 is not provided) is called a detected portion 125 . The detected portion 125 is a portion of the arm 120 that can be within the detection range DA of the proximity sensor 180 . That is, the hook 130 and the detected portion 125 are located on opposite sides of the rotating shaft portion 140 .

Arm 120 is rotatable around central axis O, which is the center of rotation (intermediate portion) of rotating shaft portion 140 . In the present embodiment, the arm 120 changes from a state in which the hook 130 is positioned above the rotating shaft portion 140 in the vertical direction to a predetermined posture in which the detected portion 125 is positioned below the rotating shaft portion 140 in the vertical direction. It is possible to rotate up to The side (one end side) of the center axis O where the hook 130 is located is made heavier than the side of the center axis O where the detected portion 125 is located. Therefore, the arm 120 and the hook 130 rotate about the central axis O from the position indicated by the solid line in FIG. 1 to the position Sp indicated by the broken line (in the direction Ag in the drawing) without any support. In order to stop the arm 120 and the hook 130 from rotating in the state of Sp in the drawing, there is a receiving portion (not shown) that contacts at least a part of the arm 120 and the hook portion 130 to restrict the rotation of the arm 120. is provided. Therefore, when the arm 120 and the hook 130 rotate about the central axis O in the Ag direction in FIG. 1 from the posture indicated by the solid line in FIG.

The hook 130 has a space (through hole) Spt through which the rubber thread is passed. The through-hole Spt is formed at a position not vertically above when the arm 120 is assembled to the first frame 110 and the hook 130 is positioned vertically above the central axis O (where the rubber thread contact portion is located on the rubber thread). At a position other than the vertical upper part of the through-hole in the hooked state), a communicating hole communicating with the external space is provided. That is, the hook 130 is located at the position indicated by the solid line in FIG. 1, and the communication hole is provided at a position other than the upper side of the drawing.

The rubber thread T1 is introduced into the through hole Spt through the communication hole, and the hook 130 is hung on the rubber thread T1 and supported. Therefore, in a state in which the rubber thread T1 is stretched in the air, the arm 120 assumes the posture depicted by the solid line in FIG. 1 (the hook 130 is vertically above the central axis O).

Since the relative position of the first frame 110 that supports the arm 120 is immovable (fixed to the device) in the device, the hook 130 cannot move in the extending direction of the rubber thread T1 (horizontal direction in FIG. 1). Virtually immobile (movement is restricted).

Second frame 170 supports proximity sensor 180 . Proximity sensor 180 is a proximity switch that detects that detected portion 125 is positioned within a predetermined range DA including the tip of proximity sensor 180 on the central axis O side. Proximity sensor 180 is supported by second frame 170 so as to be closest to detected part 125 when arm 120 shown by the dashed line in FIG. 1 assumes a horizontal posture.

The third frame 190 supports the pair of first frame 110 and second frame 170 . That is, the third frame 190 is installed on the floor of a factory where a manufacturing line for disposable diapers is installed, and the relative position of the first frame 110 within the apparatus is fixed. If the receiving portion (not shown) is also fixed to the first frame 110, its relative position within the apparatus is immovable.
That is, the arm 120, together with the rotating shaft portion 140, the first frame 110, and the third frame 190 to which the first frame is fixed, moves the hook 130, which is the rubber thread contact portion, in the extending direction of the rubber thread T1. It is regulated (extension direction movement regulating part). Further, in the present embodiment, the arm 120 is rotated by the weight of the side of the arm 120 where the hook 130 is provided, and this side is configured to move in the direction of gravity (biasing portion). In this specification, when an object moves to a different position in the gravitational direction from its previous position, it is expressed as "moving in the gravitational direction". That is, in this specification, "moving in the direction of gravity" is not limited to moving linearly along the direction of gravity.

A2. Actions and Effects of Disconnection Detection Device 100:
As shown by the solid line in FIG. 1, when the hook 130 is hooked on the rubber thread T1 and the arm 120 is held in a posture tilted from the horizontal state, the detected portion 125 at the tip of the arm 120 is detected by the proximity sensor 180. Since it is outside the range DA, the proximity sensor 180 does not detect the detectable portion 125 . A judging section (not shown) for judging whether or not the rubber thread has been cut judges that the rubber thread is not cut when the proximity sensor 180 does not detect the detected portion 125 .
When the rubber thread T1 is cut, the hook 130 side of the arm 120 rotates in the Ag direction (vertically downward direction) as described above, and enters the state indicated by the dashed line in the figure. Since detected portion 125 is in detection range DA in this state, proximity sensor 180 detects detected portion 125 . When the proximity sensor 180 detects the detected portion 125, the determination portion determines that the rubber thread has been cut.

In the present embodiment, whether or not the rubber thread T1 has been cut is detected by detecting the movement of the arm 120 or the like caused by the cutting of the rubber thread T1, instead of observing the rubber thread T1 itself. That is, the present device only determines the presence or absence of the detected portion 125 by the proximity sensor 180, and the detected portion 125 reliably passes through the detection range DA of the proximity sensor 180 when the rubber thread T1 is cut. /Since it is included, the observation becomes extremely easy and reliable compared to the case where the rubber thread T1 itself is observed by an optical sensor or the like.

In this embodiment, a hook 130 as a rubber thread contacting portion and a detected portion 125 detected by a proximity sensor 180 as a detecting portion are provided at both ends of an arm 120 that is rotatably supported. . Then, when the rubber thread T1 is cut, the arm 120 whose rotation was restricted by the rubber thread T1 rotates (movement restriction is released and rotates; in the example of FIG. 1, the hook 130 attachment side is vertically downward. It also includes a configuration in which the hook 130 side rotates in a direction other than vertically downward as in Modification 2.). If the arm 120 is rotatably supported within a predetermined angular range in this way, the rotary shaft portion 140 is rotated to return the rubber thread T1 to its original state after the rubber thread T1 is cut (to reconnect the rubber thread T1 to the through hole Spt). All that is required is to pivot the arm 120 to the center.

In this embodiment, the cutting detection device 100 detects cutting of the rubber thread T1 by turning the arm 120 about the central axis O. As shown in FIG. For this reason, compared with the mode in which the cutting of the rubber thread T1 is detected by detecting the rubber thread T1 itself with an optical sensor or the like, scraps and dust (hereinafter referred to as "garbage" as appropriate) caused by wear of the rubber thread are detected. It is possible to prevent erroneous detection due to
In this embodiment, the detected portion 125 is detected by a proximity sensor 180 instead of a contact sensor. Therefore, it is possible to reduce the possibility that the sensor will stop working due to accumulation of dust in the detection portion or the like, or that the sensor will make an erroneous detection.
In this embodiment, cutting of the rubber thread T1 is detected by the proximity sensor 180 instead of the camera or the optical sensor. Although there is a risk that the camera or optical sensor may erroneously detect cutting of the rubber thread due to adhesion of dust, such a risk can be reduced.
As described above, the proximity sensor 180 is preferably used as the detection unit, but the use of other sensors such as contact sensors, cameras, and optical sensors is not excluded.

Since the detected portion 125 can be oriented vertically downward rather than horizontally when the rubber thread T1 is not cut, dust adheres to the detected portion 125 compared to the case where the detected portion 125 is oriented vertically upward rather than horizontally. can reduce the risk.
By orienting the proximity sensor 180 in the horizontal direction Dh as shown in FIG. 1, the risk of dust adhering to the proximity sensor 180 is reduced compared to the case where the proximity sensor 180 faces vertically upward rather than horizontally. In addition, attached dust can be easily removed by its own weight.

B. Variant:
The present invention is not limited to the above-described embodiments, and can be implemented in various aspects without departing from the scope of the invention. For example, the following modifications are also possible.

B1. Variant 1:
The through hole Spt preferably communicates with the external space to facilitate passage of the rubber thread, but the communicating hole may be omitted. The position of the communication hole may be other than the position where the hook 130 contacts when it is hooked on the rubber thread T1 as described above and the vicinity thereof. Other shapes are also possible, such as a flat shape.
Although the shape of the through hole Spt can be set as appropriate, it is preferable to set the shape so as to reduce the load on the rubber thread T1. For example, when the thread rubber T1 is a rubber having a flat portion, if the portion of the through hole Spt that contacts the rubber (the portion on the upper side (vertically upper side) in the state indicated by the solid line in FIG. 1) is flattened, it can be formed at one point of the rubber. It is also possible to prevent a load from being applied to the

B2. Modification 2:
In the above embodiment, the side of the arm 120 to which the hook 130 is connected moves (rotates) downward due to its weight (gravitational force). direction can also be realized. For example, a spring may be used to apply a rotational force (force in the Ag direction in the example of FIG. 1) to the arm (biasing portion). With this configuration, it is possible to make the side on which the hook 130 is provided with the central axis O as a reference lighter than the other end 125 side. Furthermore, with such a configuration, not only a configuration in which the side of the arm 120 on which the hook 130 is present rotates in the direction of gravity, but also a configuration in which the arm 120 moves in an arbitrary direction (for example, the left-right direction in FIG. 2) can be adopted. .
When the hook 130 moves in the gravitational direction, the vertically upper side of the through hole Spt contacts the rubber thread T1, and it is preferable to provide the communication hole in a portion other than this portion. is moved (biased) in a direction other than downward in the direction of gravity, the edge of the through hole Spt on the side opposite to the direction of movement (biased) contacts (catch) the rubber thread T1. It is desirable to provide communication holes.

B3. Variant 3:
In the above embodiment, the proximity sensor 180 determines that the rubber thread T1 is cut when the detected portion 125 is within the detection range DA. The detected portion 125 in the state indicated by the solid line) may be arranged so as to be within the detection range DA. In this case, the determination unit determines that the rubber thread is not cut when the detected portion 125 exists within the detection range DA, and when the proximity sensor 180 cannot detect the detected portion 125 (when the detected portion 125 It is determined that the rubber thread T1 is broken when it is no longer within the detection range DA).

B4. Variant 4:
In the above-described embodiment, cutting of the rubber thread T1 is determined based on the presence or absence of the detected portion 125 within the detection range DA, such as by using the proximity sensor 180 as the detection portion. The moving speed of the portion 125 may be monitored, and it may be determined that the rubber thread has been cut when the portion 125 moves (rotates) at a speed equal to or higher than a predetermined speed. In such an aspect, the detection section can detect whether or not the detected section 125 exists within the detection range DA. Furthermore, when the detected portion 125 exists within the detection range DA, the detection portion can detect the moving speed of the detected portion 125 . When the detected portion 125 exists within the detection range DA and the moving speed of the detected portion 125 is greater than a predetermined value, the detection portion outputs a predetermined signal (not shown) for notifying the cutting of the rubber thread. Output to the determination unit (control unit). The judging section judges that the rubber thread has been cut when receiving the signal from the detecting section. Then, the judging section judges that the rubber thread is not cut when the signal is not output from the detecting section.

B5. Variant 5:
In the above embodiment, the detected portion 125 is the end portion of the arm 120 on the side where the hook 130 is not provided, but other portions may be used as the detected portion. That is, another portion of the arm 120 may be used as the detected portion 125 , or a separate member may be added to the arm 120 and used as the detected portion 125 .

B6. Modification 6:
The movement of the detected portion 125 before and after the rubber thread T1 is cut may employ a configuration other than that caused by the rotation of the arm 120 about the rotating shaft portion 140 as described above.
For example, the hook 130 may be configured so as to hang from the rubber thread T1, and fall under its own weight when the rubber thread T1 is cut, and the detection unit may detect the dropped hook 130/dropping hook portion 130. Good (biasing part/detection part). In this configuration, the detected portion is integrated with or attached to the hook 130 . When adopting this configuration, the hook 130 is moved by a thread, a spring, or the like from a portion where the relative position in the device is immovable so that the hook 130 does not move in the transport direction as the rubber thread T1 is transported. Suspend it (extension direction movement restriction part).

B7. Variant 7:
In the above embodiment, the rubber thread T1 is cut, the arm 120 rotates, and the detected portion 125 and the proximity sensor 180 are maintained in the detection range DA of the proximity sensor 180 (the state indicated by the dashed line in FIG. 1). A receiving portion (not shown) is provided for this purpose, but this receiving portion may be omitted.

DESCRIPTION OF SYMBOLS 100, 100b, 100c... Cutting|disconnection detection apparatus 110, 110c... 1st frame 120... Arm 125... Detected part 130... Hook 140, 140b, 140c... Rotating shaft part 170... Second frame 180... Proximity sensor 190, 190c... First frame 3 frames Ag... Gravity Al3... Arrow indicating the conveying direction of the intermediate product L3 Ap1... Arrow indicating the conveying direction of the water absorbent mat P1 As1... Arrow indicating the conveying direction of the top sheet S1 As2... Arrow indicating the conveying direction of the back sheet S2 As3...Arrow indicating the conveying direction of the back cover sheet S3 Cp1...Cutter DA...Detection range of the proximity sensor 180 Dh...Horizontal direction Dvd...Vertical direction below the hook 130 L1, L2, L3...Intermediate product O...Rotation Central axis P1... Water absorbent mat Rs2... Roll around which back sheet S2 is wound Rs3... Roll around which back cover sheet S3 is wound Rt1... Roll around which rubber thread T1 is wound Rt2... Roll around which rubber thread T2 is wound S1... Surface sheet S2... Back sheet S3 Back cover sheet Sp Space positioned when hook 130 falls Spt Space for receiving rubber thread T1, T2 Rubber thread

Claims (7)

The rubber thread contact portion is hooked on the rubber thread stretched in the air, so that the relative position between the rubber thread contact portion and the rubber thread in the device other than the extending direction of the rubber thread is kept constant. a thread rubber contact portion that
an extension direction displacement regulating portion that restricts the rubber thread contact portion from being displaced in the extension direction of the rubber thread;
an urging portion that urges the rubber thread contact portion in a direction other than the extending direction of the rubber thread;
a proximity switch that detects displacement of the rubber thread contact portion by the urging portion;
a judging section for judging that the rubber thread is cut when the proximity switch detects that the rubber thread contact portion moves in a predetermined direction by a predetermined amount or more by the urging section when the rubber thread is cut;
a detected portion that is displaced by the displacement of the rubber thread contact portion;
with
The proximity switch can detect that the detected part is positioned within a predetermined range including the proximity switch,
The part to be detected and the proximity switch are configured so that when the rubber thread contact part is displaced, the distance between the part to be detected and the proximity switch becomes the shortest when the part to be detected and the proximity switch are horizontally aligned. A thread rubber cut detection device. a rubber thread contact portion that is hooked by the rubber thread stretched in the air and whose displacement in the direction of gravity is regulated;
an extension direction displacement regulating portion that restricts the rubber thread contact portion from being displaced in the extension direction of the rubber thread;
a proximity switch for detecting displacement of the thread rubber contact portion in the direction of gravity;
a detected portion that is displaced by the displacement of the rubber thread contact portion;
with
The proximity switch can detect that the detected part is positioned within a predetermined range including the proximity switch,
The part to be detected and the proximity switch are configured so that when the rubber thread contact part is displaced, the distance between the part to be detected and the proximity switch becomes the shortest when the part to be detected and the proximity switch are horizontally aligned. A thread rubber cut detection device. The extension direction displacement regulating portion is an arm portion that rotates around a predetermined position in the device, and one end thereof is fixedly connected to a rubber thread contact portion, and the restriction by the rubber thread is released when the rubber thread is cut. and rotate
the proximity switch detects the rotation of the extension direction displacement restricting portion;
The rubber thread cut detection device according to claim 2. The proximity switch has a detection range in which the tip of the arm portion fixedly connected to the rubber thread contact portion, which is the portion to be detected, on the side where the rubber thread contact portion is not provided , is within the predetermined range. to detect whether or not the
The rubber thread cut detection device according to claim 3. The proximity switch detects whether or not the rubber thread contact portion is within the detection range, which is the predetermined range.
The rubber thread cut detection device according to claim 2. The thread rubber contact part is
Equipped with through holes,
A thread rubber stretched in the air is passed through the through hole,
The edge of the through-hole positioned substantially above the rubber thread in the vertical direction is hooked so as to abut on the rubber thread.
The rubber thread cut detection device according to any one of claims 1 to 5. The rubber thread contact portion further includes a communication hole connected to the external space at a position other than the vertically upper side of the through hole in a state of being hooked on the rubber thread,
The rubber thread cut detection device according to claim 6.

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