WO2021044786A1 - Workpiece manufacturing method and manufacturing device, and fused-sheet body manufacturing method and manufacturing device - Google Patents

Abstract

In a method according to the present invention, laser light emitted from a light source is projected and scanned onto a workpiece that is being conveyed along a conveyance surface, and as a result thereof, the workpiece is processed. First, a counting time period is set in advance on the basis of a response delay time period which is from the detection of a conveyance position of the workpiece by a sensor until the start of workpiece processing. Next, with pulse signals corresponding to the conveyance positions of the workpiece being generated, the number of first pulse signals inputted within the counting time period is counted. Furthermore, a trigger signal is generated on the basis of information about the conveyance position of the workpiece, said information being obtained by the sensor. Then the number of second pulse signals inputted after the generation of the trigger signal is counted. Finally, workpiece processing is started when the total signal count, which combines the numbers of first and second pulse signals, reaches or surpasses a preset signal count. The workpiece is preferably a sheet laminate.

Description

Manufacturing method and manufacturing equipment for workpieces, and manufacturing method and manufacturing equipment for sheet fusion products

The present invention relates to a manufacturing method and a manufacturing apparatus for a workpiece, and a manufacturing method and a manufacturing apparatus for a sheet fused body.

There is known a technique of irradiating a work piece with a laser beam from a fixed light source to perform various processing on the work piece. For example, in Patent Document 1, a scan head that irradiates a processing position of a work piece with a laser beam to perform predetermined processing, and a machining position are obtained from the type of the work piece identified by the identification means, and a trigger signal generating means. A laser machining system including a scan head controller that corrects a machining position based on a transport speed of a transport means detected via a speed detection means and controls the scan head is disclosed. ..

Further, Patent Document 2 discloses a laser processing apparatus that processes a processing pattern by irradiating a processing object being transferred by a transfer means with a laser beam in consideration of a change in the transfer speed. In this processing apparatus, the processing operation is started based on the detection of the processing object by the object detecting means provided on the upstream side in the transport direction from the processing position. This processing apparatus includes a response time setting means for setting the response delay time of the object detecting means, a response time correcting means for correcting the position of the machining pattern according to the movement amount of the machining object, and a transport for detecting the transport speed. It is also disclosed in the same document that the position of the machining pattern can be corrected according to the transport speed of the object to be machined by providing the speed detecting means.

Japanese Unexamined Patent Publication No. 11-28588 Japanese Unexamined Patent Publication No. 2009-6394

The present invention relates to a method for manufacturing a workpiece, which processes the workpiece by irradiating the workpiece transported along the transport surface while scanning a laser beam emitted from a fixed light source. ..
In the manufacturing method, a counting time based on a response delay time from the detection of the transport position of the work piece by a sensor located upstream of the machining start position to the start of machining of the work piece is performed in advance. Set it.
Then, the number of first pulse signals input within the counting time is counted in a state where the pulse signal corresponding to the transport position of the workpiece is generated.
Then, a trigger signal is generated based on the transport position information of the workpiece obtained by the sensor.
Then, the number of second pulse signals input after the trigger signal is generated is counted, and the total number of signals of the first pulse signal and the second pulse signal becomes equal to or more than a preset number of signals. At that time, the processing of the work piece is started.

The present invention also relates to a manufacturing apparatus for processing a workpiece to be transported along a transport surface by irradiating the workpiece while scanning a laser beam emitted from a fixed light source.
The manufacturing apparatus includes a pulse signal generating means for generating a pulse signal according to a transfer position of the workpiece.
Further, the manufacturing apparatus is located on the upstream side in the transport direction from the machining start position, and includes a sensor that detects the transport position of the workpiece.
Further, the manufacturing apparatus includes a counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the workpiece by the sensor to the start of machining of the workpiece.
Further, the manufacturing apparatus includes a trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor.
Further, the manufacturing apparatus includes pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated.
Further, the manufacturing apparatus includes a command means for instructing the start of machining of the workpiece based on the signal from the pulse counting means.

Further, the present invention is emitted from a light source fixed to the sheet laminate while transporting a strip-shaped sheet laminate in which a plurality of sheets containing a resin material at least partially are stacked along a transport surface. The present invention relates to a method for producing a sheet fused body having a sealed edge portion fused in a state where the edge portions of a plurality of sheets are overlapped by irradiating the sheet laminated body while scanning a laser beam.
In this manufacturing method, the counting time based on the response delay time from the detection of the transport position of the sheet laminate by the sensor located on the upstream side in the transport direction from the machining start position to the start of machining of the sheet laminate is set in advance. Set it.
Then, the number of first pulse signals input within the counting time is counted in a state where the pulse signals corresponding to the transport positions of the sheet laminates are generated.
Then, a trigger signal is generated based on the transport position information of the sheet laminate obtained by the sensor.
Then, the number of second pulse signals input after the trigger signal is generated is counted.
Then, when the total number of signals of the counted first pulse signal number and the second pulse signal number becomes equal to or more than a preset number of signals, the processing of the sheet laminate is started.

Further, the present invention is emitted from a light source fixed to the sheet laminate while transporting a strip-shaped sheet laminate in which a plurality of sheets containing a resin material at least partially are stacked along a transport surface. The present invention relates to an apparatus for producing a sheet fused body having a sealed edge portion fused in a state where the edge portions of a plurality of sheets are overlapped by irradiating the sheet laminated body while scanning a laser beam.
The manufacturing apparatus includes a pulse signal generating means for generating a pulse signal according to a transport position of the sheet laminate.
Further, the manufacturing apparatus includes a sensor located upstream of the processing start position in the transport direction and detecting the transport position of the sheet laminate.
Further, the manufacturing apparatus includes a counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the sheet laminated body by the sensor to the start of processing of the sheet laminated body.
Further, the manufacturing apparatus includes a trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor.
Further, the manufacturing apparatus includes pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated.
Further, the manufacturing apparatus includes a command means for instructing the start of processing of the sheet laminate based on the signal from the pulse counting means.

FIG. 1 is a perspective view schematically showing a part of a process of a method for manufacturing a pants-type disposable diaper as an embodiment of the present invention. FIG. 2 is a perspective view showing an embodiment of a manufacturing apparatus preferably used for carrying out the present invention. FIG. 3 is a schematic view of a main part in FIG. FIG. 4 is a schematic view showing a control method of the manufacturing apparatus shown in FIG. FIG. 5 is a schematic diagram showing a time chart in the control method of the manufacturing apparatus shown in FIG.

Detailed description of the invention

All of the techniques described in Patent Documents 1 and 2 are for laser machining the workpiece by following the transport speed of the workpiece, and do not control the start position of the laser machining. If the machining start time cannot be controlled according to the transfer speed of the workpiece, the machining start position will change if the transfer speed of the workpiece is different, so it is easy to process the workpiece with high accuracy. There wasn't.

According to the present invention, a method and an apparatus for manufacturing a work piece, and a method and a method for manufacturing a sheet fusion body, which can process the work piece with high accuracy even when the transfer speeds of the work piece are different. Regarding the device.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. FIG. 1 shows an example in which the method of the present invention is applied to the production of a pants-type disposable diaper, which is an example of a sheet fusion body. In the following embodiment, an exterior body having a pair of side seal portions is provided as a sheet fusion body, that is, a sheet fusion body having a seal edge portion fused in a state where the edges of a plurality of sheets are overlapped. The present invention will be described by taking a pants-type disposable diaper as an example.

In the present embodiment, as shown in FIG. 1, a step of manufacturing a diaper continuous body 10A including a strip-shaped sheet laminate 10 and a manufacturing apparatus (laser type processing apparatus) 20 shown in FIG. 2 are used. A pants-type disposable diaper can be manufactured by a manufacturing method including a step of dividing the diaper continuum 10A into individual diapers 1 by fusing. The sheet laminate 10 is formed by stacking a plurality of sheets containing a resin material at least in part. The diaper 1 has a pair of side seal portions 4 and 4. The diaper continuum 10A has a structure in which a plurality of disposable diapers are connected, and more specifically, a precursor of a pants-type disposable diaper in which a side seal portion is not formed is connected in one direction. There is.

In the method of the present embodiment, as shown in FIG. 1, the strip-shaped outer layer sheet 31 continuously supplied from the raw fabric roll (not shown) and the original fabric roll (not shown) are continuously supplied. A plurality of elastic members 5, 6 and 7 forming waist gathers, waist gathers and leg gathers are arranged between the strip-shaped inner layer sheet 32 in an elongated state extended to a predetermined elongation rate. The elastic member 7 is arranged while forming a predetermined leg circumference pattern via a known swing guide (not shown) that reciprocates in orthogonal to the flow direction of the sheet. Further, the strip-shaped outer layer sheet 31 and the strip-shaped inner layer sheet 32 are hot-heated by an adhesive coating machine (not shown) at a predetermined portion on the facing surface of at least one of the sheets 31 and 32 before they are overlapped. Apply melt adhesive. Hot melt type adhesives may be intermittently applied to each of the elastic members 5 and 6 by an adhesive coating machine (not shown) before being arranged between the sheets 31 and 32.

Then, as shown in FIG. 1, a band-shaped outer layer sheet 31 and a band-shaped inner layer sheet 32 in which the elastic members 5, 6 and 7 are sandwiched between the pair of nip rolls 11 and 11 are fed and pressurized. , A strip-shaped exterior body 3 in which a plurality of elastic members 5, 6 and 7 are arranged in an extended state is formed between the strip-shaped sheets 31 and 32. Further, a plurality of joints (not shown) for joining the strip-shaped outer layer sheet 31 and the strip-shaped inner layer sheet 32 between two adjacent elastic members 6 and 6, for example, a convex roll 12 and an anvil roll 13 are provided. It is formed by using the provided joining means.

After that, if necessary, using an elastic member precut means (not shown), the plurality of elastic members 6 and 7 are pressed and contracted, respectively, in accordance with the position where the absorbent main body 2 described later is arranged. Divide into multiple pieces so that the function is not exhibited.

Next, as shown in FIG. 1, an adhesive such as a hot melt type adhesive is previously applied to the absorbent main body 2 manufactured in another step, and the absorbent main body 2 is coated with an inner layer constituting the strip-shaped exterior body 3. It is intermittently supplied and fixed on the sheet 32. Then, a leg hole LO'is formed inside the annular portion surrounded by the elastic member 7 in an annular shape. This leg hole forming step can be carried out by using a method similar to the method in the conventional method for manufacturing this kind of article such as a rotary cutter and a laser cutter.

Subsequently, the strip-shaped exterior body 3 is folded in the width direction (direction orthogonal to the transport direction K of the exterior body 3). More preferably, as shown in FIG. 1, both side portions 3a and 3a of the strip-shaped exterior body 3 along the transport direction K are folded back so as to cover both ends in the longitudinal direction of the absorbent main body 2 to cover the longitudinal length of the absorbent main body 2. After fixing both ends in the direction, the exterior body 3 is folded in half in the width direction together with the absorbent body 2. In this way, the diaper continuum 10A as the sheet laminated body 10 is obtained.

The diaper continuum 10A thus obtained is conveyed to the laser processing apparatus 20. As shown in FIG. 2, the laser processing apparatus 20 has a first surface 21a facing outward and a second surface 21b located on the opposite side thereof and facing inward, and has a strip shape in which a plurality of sheets are stacked. The sheet laminated body 10 is provided with a cylindrical cylindrical roll 21 that conveys the sheet laminated body 10 by rotating the sheet laminated body 10 in one direction while supporting the sheet laminated body 10 on the first surface 21a in the longitudinal direction thereof. Further, the laser processing apparatus 20 includes a laser light irradiation unit 35 capable of scanning the laser light on the second surface 21b side. Further, the laser processing apparatus 20 faces the sheet laminate 10 supported on the first surface 21a with the first surface 21a while moving in the rotation direction K of the cylindrical roll 21 in synchronization with the rotation of the cylindrical roll 21. It is provided with a plurality of pressurizing heads 26 that press from the side to be pressed toward the first surface 21a side.

In the present embodiment, the strip-shaped sheet laminate 10 is supported on the first surface 21a as a diaper continuum 10A in which the absorbent body 2 is intermittently arranged, and is conveyed by the cylindrical roll 21. The diaper continuum 10A is turned around by the introduction roll 28 and introduced onto the first surface 21a. Then, in a state where the diaper continuum 10A is supported on the first surface 21a of the cylindrical roll 21, the diaper continuum 10A is processed by a laser beam 30, and the diaper 1 obtained thereby provides the guide roll 29. Then, it is sent out of the device 20. That is, in the present embodiment, the diaper continuous body 10A as the sheet laminated body 10 is the workpiece, the first surface 21a of the cylindrical roll 21 is the transport surface of the workpiece, and the transport surface is the peripheral surface of the cylinder. It is formed in the shape of a curved surface.

As shown in FIG. 2, the cylindrical roll 21 has a plurality of pressure portion support members 121 intermittently provided in the circumferential direction of the cylindrical roll 21 on its peripheral surface portion. The pressurizing portion support member 121 forms a part of the peripheral surface portion of the cylindrical roll 21, and is formed of a metal material such as iron, aluminum, stainless steel, or copper, or a heat-resistant material such as ceramics.

The pressurizing portion support member 121 has a slit-shaped support member side opening 27 through which the laser beam 30 irradiated from the second surface 21b side can pass. The support member side opening 27 is a slit-shaped opening extending in a direction intersecting the circumferential direction of the cylindrical roll 21, and functions as a laser light transmitting portion. Specifically, the support member side opening 27 has a rectangular shape in a plan view, and its longitudinal direction coincides with the width direction of the strip-shaped sheet laminate 10 and the diaper continuous body 10A, preferably. , The cylindrical roll 21 extends in a direction parallel to the axial length direction of the rotation axis. A plurality of support member side openings 27 are provided at predetermined intervals in the circumferential direction of the cylindrical roll 21.

The pressurizing head 26 presses the strip-shaped sheet laminate 10, that is, the diaper continuum 10A, which is the object of fusing, toward the cylindrical roll 21 at a position corresponding to the above-mentioned support member side opening 27. Used. The pressurizing head 26 is arranged at a position on the first surface 21a side of the cylindrical roll 21. Specifically, the pressurizing head 26 presses the diaper continuum 10A supported on the support member side opening 27 of the pressurizing portion support member 121 toward the support member side opening 27 side. It is used, and one pressurizing head 26 is provided for one support member side opening 27. In the manufacturing apparatus 20 shown in FIG. 2, a plurality of pressurizing heads 26 are arranged. Each pressurizing head 26 has a rotating shaft on an extension of the rotating shaft of the cylindrical roll 21, and is arranged on the peripheral surface of the second cylindrical roll 25 arranged adjacent to the cylindrical roll 21. The second cylindrical roll 25 rotates in synchronization with the cylindrical roll 21.

When the second cylindrical roll 25 rotates in synchronization with the cylindrical roll 21, each pressurizing head 26 moves in the rotational direction of the cylindrical roll 21 in synchronization with the rotation of the cylindrical roll 21, and the outer periphery of the cylindrical roll 21 is moved. It is possible to orbit along the peripheral surface of the cylindrical roll 21 in the same direction as the rotation direction of the pressurizing portion support member 121 constituting the portion and at the same speed as the angular velocity of the pressurizing portion support member 121. Further, each pressurizing head 26 is supported by a support portion 24, and can be brought into contact with and separated from the first surface 21a.

The laser light irradiation unit 35 includes a galvano scanner that freely scans the laser light 30. As shown in FIG. 3, the laser beam irradiation unit 35 supports the first mechanism 35a for advancing and retreating the laser beam 30 in a direction parallel to the rotation axis of the cylindrical roll 21, and the laser beam 30 is supported on the first surface 21a of the cylindrical roll 21. The second mechanism 35b that moves the position (irradiation point) corresponding to the sheet laminated body (not shown) of the continuous diaper body in the circumferential direction of the cylindrical roll 21, and the spot of the laser beam 30 on the peripheral surface of the cylindrical roll 21. It is provided with an adjusting mechanism 35c that keeps the diameter constant. The adjusting mechanism 35c includes a condenser lens. By having such a configuration, the laser light irradiation unit can arbitrarily move the irradiation point of the laser light 30 in the circumferential direction of the cylindrical roll 21 and in the direction orthogonal to the circumferential direction.

The processing start position of the sheet laminate 10 can be controlled in the manner shown in FIG. 4, for example. In FIG. 4, arrows indicate the flow of signal transmission / reception.

As shown in FIG. 4, the cylindrical roll 21 is rotated in one direction (conveyance direction K) by the servomotor 40. The servomotor 40 is adapted to generate a pulse-shaped encoder signal Se at predetermined intervals according to the rotation position of the cylindrical roll 21, and the encoder signal Se is received by the gate means 41. The number of pulses of the encoder signal Se counted within a predetermined time increases or decreases according to the rotation speed of the cylindrical roll 21. The rotation speed of the cylindrical roll 21 corresponds to the transport position of the workpiece. That is, the servomotor 40 is an example of a pulse signal generating means that generates a pulse signal according to the transport position of the workpiece.

As shown in the figure, a proximity sensor 42 is installed at a position of the cylindrical roll 21 facing the first surface 21a. The proximity sensor 42 is located upstream of the machining start position, that is, the laser irradiation position on the workpiece in the transport direction K. The proximity sensor 42 can detect that the workpiece being transported has been transported to a predetermined position by detecting a dog (not shown) attached to the cylindrical roll 21. Further, the proximity sensor 42 further includes a trigger signal generating means (not shown). The trigger signal St is generated when the proximity sensor 42 detects the dog, and the generated trigger signal St is received by the logic circuit 45.

The logic circuit 45 can receive the correction pulse signal Sa generated based on the counting time Td in addition to receiving the trigger signal St. The logic circuit 45 is an OR circuit, and can generate a measurement start signal Sm by either receiving a trigger signal St or receiving a correction pulse signal Sa. The measurement start signal Sm is received by the gate means 41. The correction pulse signal Sa can be generated, for example, by the correction pulse generation means 45a that converts the counting time Td into the correction pulse signal Sa. The counting time Td starts the machining of the workpiece from the detection of the position of the workpiece being conveyed by the proximity sensor 42 by preliminarily operating the manufacturing apparatus before actually starting the machining of the workpiece. It is preferable to measure the response delay time until the response is performed, and based on this response delay time, manually or automatically set the response delay time in advance by the counting time setting means 45b. The counting time Td can be set within the range of the response delay time or less, with the response delay time as the upper limit.

By receiving both the measurement start signal Sm and the encoder signal Se, the gate means 41 outputs the encoder signal Se input while the measurement start signal Sm is being received as the measurement pulse signal Pm, and outputs this output. The signal can be received by the pulse counting means 46. That is, the gate means 41 is an AND logic circuit.

The pulse counting means 46 measures the number of pulses of the measured pulse signal Pm. A signal based on the number of pulses of the measured pulse signal Pm measured by the pulse counting means 46 can be received by the counting value determining means 47. When the number of signals of the measurement pulse signal Pm exceeds the preset number of signals, the counting value determining means 47 outputs a signal to the command means 50 for instructing the start of machining of the workpiece. When the command means 50 receives the signal from the count value determination means 47, the command means 50 outputs the machining start signal Sp to the optical scanning means 35g. The optical scanning means 35g is connected to a machining information setting means 35h that sets the thickness, transport speed, machining position, etc. of the work piece, and outputs a signal obtained by converting the position information of the work piece into coordinate data. Based on the information input from the means 35i, the laser light irradiation unit 35 is driven to irradiate the workpiece with the laser light 30 for a predetermined time while scanning the laser light 30.

The control of the machining start position described above will be described based on the time chart shown in FIG. First, the servomotor 40 generates an encoder signal Se according to the rotation position of the cylindrical roll 21. This encoder signal Se is a pulse signal in which the signal is repeatedly turned on and off for a certain moving distance according to the rotation of the cylindrical roll, that is, the position of the workpiece being conveyed, and the signal is the gate means. It is continuously received by 41. When the number of rotations of the cylindrical roll 21 is high, that is, when the transfer speed of the workpiece is high, the signal on / off interval of the encoder signal Se becomes short. On the other hand, when the rotation speed of the cylindrical roll 21 is low, that is, when the transport speed of the workpiece is slowed down, the signal on / off interval in the encoder signal Se becomes long.

Next, input the program start signal to start the machining control program. The program start signal (not shown) is, for example, an upstream sensor (not shown) that is arranged upstream of the proximity sensor 42 in the transport direction and is attached to the cylindrical roll 21 and capable of detecting the dog. It is arranged separately from 42 and generated as a start trigger signal (not shown) from the upstream sensor, or the next trigger is generated from the machining end signal generated when machining of the previous workpiece is completed. By the time the signal St is input, it can be input to the correction pulse generation means 45a. After the program start signal is input, the correction pulse signal Sa is transmitted from the correction pulse generation means 45a to the logic circuit 45 based on the preset counting time Td. The time during which the correction pulse signal Sa is turned on is equal to the counting time Td. The logic circuit 45 that has received the correction pulse signal Sa outputs the measurement start signal Sm to the gate means 41. As a result, the gate means 41 receives both the measurement start signal Sm and the encoder signal Se. Therefore, the encoder signal Se input while the measurement start signal Sm is being received is used as the measurement pulse signal. It is output to the pulse counting means 46 as a first pulse signal Pm1. This output signal is received by the pulse counting means 46, the number of signals (number of pulses) of the first pulse signal Pm1 is counted, and the number of signals is stored. When the correction pulse signal Sa is stopped, the output of the measurement start signal Sm is also stopped.

Next, based on the detection of the transport position of the workpiece by the proximity sensor 42, the trigger signal St is generated from the trigger signal generation means in the proximity sensor 42 and transmitted to the logic circuit 45. When the logic circuit 45 receives the trigger signal St, the logic circuit 45 outputs the measurement start signal Sm to the gate means 41. As a result, the gate means 41 that has received the measurement start signal Sm and the encoder signal Se outputs the input encoder signal Se to the pulse counting means 46 as the second pulse signal Pm2 that is the measurement pulse signal. This output signal is received by the pulse counting means 46, the number of signals (number of pulses) of the second pulse signal Pm2 is counted, and the number of signals is stored. The on / off of the trigger signal St can be controlled according to the transport speed of the workpiece so that it is turned on, for example, when a dog is detected and turned off before the next dog is detected. ..

Finally, the total number of signals of the first pulse signal Pm1 and the second pulse signal Pm2 counted by the pulse counting means 46 is compared with the preset threshold signal number. The number of threshold signals can be set in advance by manually inputting the number of signals estimated from the resolution of the product or encoder signal from the outside via, for example, the threshold signal number setting means 47a. The total number of signals is compared with the number of threshold signals, and if the total number of signals does not reach the number of threshold signals, the counting of the second pulse signal Pm2 is continued. Further, the total number of signals is compared with the number of threshold signals, and when the total number of signals is equal to or greater than the number of threshold signals, a signal is transmitted from the pulse counting means 46 to the command means 50. Upon receiving the signal, the command means 50 transmits a machining start signal Sp toward the optical scanning means 35g, thereby driving the laser beam irradiation unit 35 to start machining the workpiece by irradiation with the laser beam. After irradiating the laser beam for a certain period of time, the machining start signal Sp is turned off, and the machining end signal is generated from the command means 50 to the optical scanning means 35 g, and the machining of the workpiece, that is, the irradiation of the laser beam is stopped. Let me. The work piece can be processed through the above steps. After that, the above-mentioned steps are repeated.

As shown in FIG. 5, the time from the output of the trigger signal St to the transmission of the machining start signal Sp is set as the time T1, and after the optical scanning means 35g receives the machining start signal Sp, the laser irradiation is actually performed. When the time until the start of machining is set to time T2 and the transport speed of the workpiece is high, the number of signals of the first pulse signal Pm1 measured at the counting time Td increases. The number of signals of the second pulse signal Pm2 measured until the number of preset threshold signals is reached is smaller than that in the case where the transport speed is slow. That is, the time T1 from the output of the trigger signal St to the transmission of the machining start signal Sp is shorter than that in the case where the transfer speed of the workpiece is slow.

Further, when the transport speed of the workpiece is high, the transport distance of the workpiece to be transported after a certain period of time elapses becomes longer than when the transport speed is slow, so that during the time T2. The transport distance of the work piece to be transported to is increased. At this time, by setting or controlling the counting time Td so as to be substantially the same as the time T2, the time from the output of the trigger signal St input from the proximity sensor 42 to the actual start of machining ( That is, it is represented by the sum of time T1 and time T2. Hereinafter, this is also referred to as "time T1 + T2"), and the total number of pulse signals measured is actually laser processing started from the output of the trigger signal St. Since it substantially matches the moving distance of the machining start position in the workpiece that has moved between T1 and T2, it can be controlled to be constant even if the transport speed is different. The "substantially the same time" is not limited to the case where the counting time Td is set or controlled at the same time as the time T2, and the counting time Td is set or controlled within a predetermined time range based on the time T2. The purpose is to allow that. That is, if the difference between the counting time Td and the time T2 is within a specific time range, the effect of the present invention is sufficiently exhibited. The range of time allowed as "substantially the same time" can be appropriately set or controlled according to the transport speed of the workpiece and the target machining accuracy. For example, the workpiece is 50 m / min or more and 200 m or more. When the product is transported at a constant transport speed of / min or less, the time T2 is 0.005 sec, and the required accuracy is 0.3 mm, the counting time Td is in the range of "time T2 ± time T2 x 0.024". You can set the time within. However, by setting the counting time Td to the same time as the time T2 (ie, counting time Td = time T2), the total number of pulse signals measured during time T1 + T2 moved during time T1 + T2. Since it matches the moving distance of the machining start position in the workpiece, it is particularly preferable in that the machining start position can be controlled to be constant with higher accuracy.

On the other hand, when the transport speed of the workpiece is slow, the number of signals of the first pulse signal Pm1 measured at the counting time Td decreases, so that the number of signals measured before reaching the preset threshold signal number is reached. The number of signals of the pulse signal Pm2 of 2 is larger than that in the case where the transport speed is high. That is, the time T1 from the output of the trigger signal St to the transmission of the machining start signal Sp is longer than that in the case where the transfer speed of the workpiece is high, so that it is on the downstream side in the transfer direction of the workpiece. The machining start signal Sp will be transmitted at the position.

Further, when the transport speed of the workpiece is slow, the transport distance of the workpiece to be transported within a certain period of time is shorter than that when the transport speed is high, so that during the time T2. The transport distance of the workpiece to be transported is shortened. Similarly, even when the transport speed of the workpiece is slow, by setting or controlling the counting time Td so as to be substantially the same time as the time T2, from the output of the trigger signal St input from the proximity sensor 42. Since the total number of pulse signals measured during the time T1 + T2 until the actual start of machining substantially matches the moving distance of the machining start position in the workpiece that has moved during the time T1 + T2, the transport speed is increased. It can be controlled to be constant even if they are different. The effect of the present invention can be sufficiently achieved if the "substantially the same time" in the present embodiment is set or controlled within the same range as when the counting time Td is high in the transport speed of the workpiece. However, also in this embodiment, by setting the counting time Td to the same time as the time T2 (counting time Td = time T2), the total number of pulse signals measured during the time T1 + T2 is the trigger signal St. The time from the output to the actual start of laser machining Since it matches the moving distance of the machining start position on the workpiece that moved between T1 + T2, the machining start position is controlled to be constant with higher accuracy. It is particularly preferable in that it can be performed.

According to the control as described above, the irradiation of the laser beam to the workpiece can be started from a specific position regardless of the increase or decrease in the rotation speed of the cylindrical roll 21, that is, regardless of the transport speed of the workpiece. Since it can be controlled, even if the transfer speed of the workpiece is different, the machining start position can be kept constant and the workpiece can be machined with high accuracy. Further, according to the above-mentioned control, since it is not necessary to perform coordinate conversion of the position information based on the encoder signal in order to make the machining start position constant, the control load on the machining apparatus itself can be reduced, and the workpiece can be processed. Can be processed at high speed. On the other hand, in the conventional method, since it is necessary to convert the position information based on the encoder signal into two-dimensional coordinates or three-dimensional coordinates each time and then scan the laser beam, the machining start position of the workpiece is the transport speed. This may change depending on the type of processing, or the load on the control system of the processing equipment may increase, which may be one of the factors that hinder high-speed and high-precision processing.

In the present invention, the transport surface of the work piece is not limited to a curved surface such as a cylindrical surface, and may be a flat surface. However, as described above, when the transport surface is a curved surface, the effect of the present invention becomes more remarkable. Specifically, when the transport surface of the workpiece is a curved surface, in the conventional method, it is necessary to convert the position information based on the encoder signal into three-dimensional coordinates, so that the transport surface is a flat surface. In comparison, more arithmetic processing had to be performed, and the load on the control system of the processing apparatus was significantly large. In this regard, according to the manufacturing apparatus of the present invention, it is not necessary to perform arithmetic processing such as coordinate conversion. Therefore, even when the transport surface is a curved surface, laser light irradiation is performed while reducing the control load on the processing apparatus itself. Since the machining start position can be controlled to be constant, high-precision machining of the workpiece can be efficiently and continuously performed.

In the above-described embodiment, as the work piece to which the present invention is applied, the sheet laminate 10, which is a precursor of a pants-type disposable diaper, has been mentioned as an example, but the work piece to which the present invention is applied. Is not limited to this, and any article that can be processed by irradiation with a laser beam can be applied to the present invention.

Further, as is clear from the above description, according to the present invention, not only a method for manufacturing a work piece, but also an apparatus for manufacturing a work piece, a method for producing a sheet fused body, and an apparatus for manufacturing a sheet fused body are provided. Will be done.

Although the present invention has been described above based on its preferred embodiment, the present invention is not limited to the above-described embodiment. For example, in the above embodiment, the position information of the sheet laminate 10 which is the work piece is acquired from the encoder signal from the servomotor 40, but instead of this, it is installed on the peripheral surface of the cylindrical roll 21. The position information of the sheet laminated body 10 may be acquired based on the encoder signal from the linear encoder (not shown). It is advantageous to use a linear encoder installed on the peripheral surface of the cylindrical roll 21 because the accuracy of position detection of the sheet laminate 10 is further improved.

Regarding the above-described embodiment, the present invention further discloses the following manufacturing method and manufacturing apparatus for the workpiece, and manufacturing method and manufacturing apparatus for the sheet fused body.

<1>
A method for manufacturing a work piece, which comprises irradiating a work piece transported along a transport surface with a laser beam emitted from a fixed light source while scanning the work piece to process the work piece.
A counting time based on the response delay time from the detection of the transport position of the workpiece by the sensor located upstream of the machining start position to the start of machining of the workpiece is set in advance.
The number of first pulse signals input within the counting time is counted in a state where the pulse signal corresponding to the transport position of the workpiece is generated.
A trigger signal is generated based on the transport position information of the workpiece obtained by the sensor.
The number of second pulse signals input after the trigger signal is generated is counted, and the number of second pulse signals is counted.
A method for manufacturing a work piece, which starts machining the work piece when the total number of signals of the first pulse signal number and the second pulse signal number becomes equal to or more than a preset number of signals.

<2>
A manufacturing apparatus for processing a work piece by irradiating the work piece transported along the transport surface while scanning a laser beam emitted from a fixed light source.
A pulse signal generating means for generating a pulse signal according to the transport position of the workpiece, and a pulse signal generating means.
A sensor located upstream of the machining start position in the transport direction and detecting the transport position of the workpiece,
A counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the workpiece by the sensor to the start of machining of the workpiece.
A trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor, and a trigger signal generating means.
A pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated, respectively.
An apparatus for manufacturing a workpiece, comprising a command means for instructing the start of machining of the workpiece based on a signal from the pulse counting means.

<3>
The device for manufacturing a workpiece according to <2>, wherein the pulse signal generating means is a servomotor or a linear encoder capable of generating a pulsed encoder signal.
<4>
A correction pulse generating means for converting the counting time into a correction pulse signal and a logic circuit which is a means for receiving the trigger signal or the correction pulse signal are further provided.
The logic circuit is an OR circuit, and is a means capable of generating a measurement start signal for starting measurement of the first pulse signal number or the second pulse signal number by receiving the correction pulse signal or the trigger signal. , The apparatus for manufacturing a workpiece according to the above <2> or <3>.
<5>
A means having an AND logic circuit that receives both the measurement start signal and the pulsed encoder signal generated from the pulse signal generating means and outputs the first pulse signal or the second pulse signal as the measurement pulse signal. The apparatus for manufacturing a workpiece according to any one of <2> to <4>, further comprising a certain gate means.

<6>
The description in any one of <2> to <5>, further comprising a threshold signal number setting means for setting a threshold signal number to be compared with the total signal number of the first pulse signal number and the second pulse signal number. Work piece manufacturing equipment.
<7>
A count value determining means for outputting a signal to the command means when the total number of signals of the first pulse signal number and the second pulse signal number becomes equal to or more than a preset number of signals is further provided. The apparatus for manufacturing a workpiece according to any one of <2> to <6>.

<8>
While transporting a strip-shaped sheet laminate in which a plurality of sheets containing at least a resin material are stacked along a transport surface, the laser beam emitted from a fixed light source is scanned by the sheet laminate. It is a method of producing a sheet fusion body having a sealing edge portion fused in a state where the edges of a plurality of sheets are overlapped by irradiating while irradiating the sheet laminate.
A counting time based on the response delay time from the detection of the transport position of the sheet laminate by the sensor located upstream of the machining start position to the start of machining of the sheet laminate is set in advance.
With the pulse signal generated according to the transport position of the sheet laminate, the number of first pulse signals input within the counting time is counted.
A trigger signal is generated based on the transport position information of the sheet laminate obtained by the sensor.
When the number of second pulse signals input after the trigger signal is generated is counted and the total number of signals of the first pulse signal and the second pulse signal becomes equal to or more than a preset number of signals. In addition, a method for manufacturing a sheet fused body, which starts processing of the sheet laminated body.

<9>
While transporting a strip-shaped sheet laminate in which a plurality of sheets containing at least a resin material are stacked along a transport surface, the laser beam emitted from a fixed light source is scanned by the sheet laminate. It is an apparatus for producing a sheet fused body having a seal edge portion fused in a state where the edge portions of a plurality of sheets are overlapped by irradiating while irradiating the sheet laminated body.
A pulse signal generating means for generating a pulse signal according to a transport position of the sheet laminate, and a pulse signal generating means.
A sensor located upstream of the machining start position in the transport direction and detecting the transport position of the sheet laminate,
A counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the sheet laminated body by the sensor to the start of processing of the sheet laminated body.
A trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor, and a trigger signal generating means.
A pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated, respectively.
A sheet fused body manufacturing apparatus including a command means for instructing the start of processing of a sheet laminated body based on a signal from the pulse counting means.

<10>
The counting time is set to be the time from the output of the machining start signal output when the total number of signals becomes equal to or greater than the preset number of signals to the start of machining of the workpiece. > The method for manufacturing a work piece.
<11>
The workpiece is configured to be machined based on the machining start signal output from the command means.
The subject according to any one of <2> to <7>, wherein the time from the output of the machining start signal to the start of machining of the workpiece is set as the counting time in the counting time setting means. Work piece manufacturing equipment.
<12>
The counting time is set to be the time from the output of the machining start signal output when the total number of signals becomes equal to or greater than the preset number of signals to the start of machining of the sheet laminate. > The method for producing a sheet fusion body.
<13>
The sheet laminate is configured to be machined based on the machining start signal output from the command means.
The sheet fused body manufacturing apparatus according to <9>, wherein in the counting time setting means, the time from the output of the machining start signal to the start of machining of the sheet laminate is set as the counting time.

<14>
Using an OR logic circuit that receives the correction pulse signal generated based on the counting time or the trigger signal,
When the logic circuit receives the correction pulse signal or the trigger signal, the measurement start signal for starting the measurement of the first pulse signal number or the second pulse signal number is generated, and the first pulse signal number or the first pulse signal number or The method for producing a sheet fused body according to <8> or <12>, wherein the measurement of the number of second pulse signals is started.
<15>
The method for manufacturing a sheet fused body according to <14>, wherein when both the measurement start signal and the pulse signal are received, the first pulse signal or the second pulse signal is output as the measurement pulse signal.
<16>
Any of the above <8>, <12>, <14>, or <15> in which the number of threshold signals for comparison with the total number of signals of the first pulse signal and the second pulse signal is set. The method for producing a sheet fused body according to Kaichi.
<17>
The processing of the sheet laminate is started based on the processing start signal output when the total number of signals becomes equal to or more than the preset number of signals. 16> The method for producing a sheet fused body according to any one of.

<18>
The time from the output of the machining start signal output when the total number of signals becomes equal to or greater than the preset number of signals to the start of machining of the sheet laminate is set as the counting time, and in that state, the said The method for producing a sheet fused body according to any one of <8>, <12>, and <14> to <17>, wherein the processing of the sheet laminate is started based on the processing start signal.
<19>
The sheet fusion body in the manufacturing method according to any one of <8>, <12>, <14> to <18> is a pants-type disposable diaper.
Pants-type disposable diapers manufactured by the above manufacturing method.

According to the present invention, the workpiece can be machined with high accuracy even when the transport speeds of the workpieces are different.

Claims (19)

1. A method for manufacturing a work piece, which comprises irradiating a work piece transported along a transport surface with a laser beam emitted from a fixed light source while scanning the work piece to process the work piece.
   A counting time based on the response delay time from the detection of the transport position of the workpiece by the sensor located upstream of the machining start position to the start of machining of the workpiece is set in advance.
   The number of first pulse signals input within the counting time is counted in a state where the pulse signal corresponding to the transport position of the workpiece is generated.
   A trigger signal is generated based on the transport position information of the workpiece obtained by the sensor.
   When the number of second pulse signals input after the trigger signal is generated is counted and the total number of signals of the first pulse signal and the second pulse signal becomes equal to or more than a preset number of signals. In addition, a method for manufacturing a work piece, which starts processing the work piece.
2. Claim 1 is set so that the counting time is the time from the output of the machining start signal output when the total number of signals becomes equal to or more than a preset number of signals to the start of machining of the workpiece. The method for manufacturing a work piece according to.
3. A manufacturing apparatus for processing a work piece by irradiating the work piece transported along the transport surface while scanning a laser beam emitted from a fixed light source.
   A pulse signal generating means for generating a pulse signal according to the transport position of the workpiece, and a pulse signal generating means.
   A sensor located upstream of the machining start position in the transport direction and detecting the transport position of the workpiece,
   A counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the workpiece by the sensor to the start of machining of the workpiece.
   A trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor, and a trigger signal generating means.
   A pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated, respectively.
   An apparatus for manufacturing a workpiece, comprising a command means for instructing the start of machining of the workpiece based on a signal from the pulse counting means.
4. The apparatus for manufacturing a workpiece according to claim 3, wherein the pulse signal generating means is a servomotor or a linear encoder capable of generating a pulsed encoder signal.
5. A correction pulse generating means for converting the counting time into a correction pulse signal and a logic circuit which is a means for receiving the trigger signal or the correction pulse signal are further provided.
   The logic circuit is an OR circuit, and is a means capable of generating a measurement start signal for starting measurement of the first pulse signal number or the second pulse signal number by receiving the correction pulse signal or the trigger signal. , The apparatus for manufacturing a workpiece according to claim 3 or 4.
6. A means having an AND logic circuit that receives both the measurement start signal and the pulsed encoder signal generated from the pulse signal generating means and outputs the first pulse signal or the second pulse signal as the measurement pulse signal. The apparatus for manufacturing a workpiece according to claim 5, further comprising a certain gate means.
7. The subject according to any one of claims 3 to 6, further comprising a threshold signal number setting means for setting a threshold signal number to be compared with the total signal number of the first pulse signal number and the second pulse signal number. Work piece manufacturing equipment.
8. A counting value determining means for outputting a signal to the command means when the total number of signals of the first pulse signal number and the second pulse signal number becomes equal to or more than a preset number of signals is further provided. The apparatus for manufacturing a workpiece according to any one of claims 3 to 7.
9. The workpiece is configured to be machined based on the machining start signal output from the command means.
   The workpiece according to any one of claims 3 to 8, wherein in the counting time setting means, the time from the output of the machining start signal to the start of machining of the workpiece is set as the counting time. Manufacturing equipment.
10. While transporting a strip-shaped sheet laminate in which a plurality of sheets containing at least a resin material are stacked along a transport surface, the laser beam emitted from a fixed light source is scanned by the sheet laminate. It is a method of producing a sheet fusion body having a sealing edge portion fused in a state where the edges of a plurality of sheets are overlapped by irradiating while irradiating the sheet laminate.
    A counting time based on the response delay time from the detection of the transport position of the sheet laminate by the sensor located upstream of the machining start position to the start of machining of the sheet laminate is set in advance.
    With the pulse signal generated according to the transport position of the sheet laminate, the number of first pulse signals input within the counting time is counted.
    A trigger signal is generated based on the transport position information of the sheet laminate obtained by the sensor.
    When the number of second pulse signals input after the trigger signal is generated is counted and the total number of signals of the first pulse signal and the second pulse signal becomes equal to or more than a preset number of signals. In addition, a method for manufacturing a sheet fused body, which starts processing of the sheet laminated body.
11. 10. The counting time is set so as to be the time from the output of the machining start signal output when the total number of signals becomes equal to or more than a preset number of signals to the start of machining of the sheet laminate. The method for manufacturing a sheet fusion product according to the above.
12. Using an OR logic circuit that receives the correction pulse signal generated based on the counting time or the trigger signal,
    When the logic circuit receives the correction pulse signal or the trigger signal, the measurement start signal for starting the measurement of the first pulse signal number or the second pulse signal number is generated, and the first pulse signal number or the first pulse signal number or The method for manufacturing a sheet fused body according to claim 10 or 11, wherein the measurement of the number of second pulse signals is started.
13. The method for manufacturing a sheet fused body according to claim 12, wherein when both the measurement start signal and the pulse signal are received, the first pulse signal or the second pulse signal is output as the measurement pulse signal.
14. The sheet fusion body according to any one of claims 10 to 13, wherein a threshold signal number for comparison with the total number of signals of the first pulse signal number and the second pulse signal number is set. Production method.
15. The sheet according to any one of claims 10 to 14, which starts processing of the sheet laminate based on a processing start signal output when the total number of signals becomes equal to or more than a preset number of signals. A method for manufacturing a fused body.
16. The time from the output of the machining start signal output when the total number of signals becomes equal to or greater than the preset number of signals to the start of machining of the sheet laminate is set as the counting time, and in that state, the said The method for producing a sheet fused body according to any one of claims 10 to 15, wherein the processing of the sheet laminate is started based on the processing start signal.
17. While transporting a strip-shaped sheet laminate in which a plurality of sheets containing at least a resin material are stacked along a transport surface, the laser beam emitted from a fixed light source is scanned by the sheet laminate. It is an apparatus for producing a sheet fused body having a seal edge portion fused in a state where the edge portions of a plurality of sheets are overlapped by irradiating while irradiating the sheet laminated body.
    A pulse signal generating means for generating a pulse signal according to a transport position of the sheet laminate, and a pulse signal generating means.
    A sensor located upstream of the machining start position in the transport direction and detecting the transport position of the sheet laminate,
    A counting time setting means for setting a counting time based on a response delay time from the detection of the transport position of the sheet laminated body by the sensor to the start of processing of the sheet laminated body.
    A trigger signal generating means for generating a trigger signal based on the transport position information obtained by the sensor, and a trigger signal generating means.
    A pulse counting means for counting the number of first pulse signals generated within the counting time and the number of second pulse signals generated after the trigger signal is generated, respectively.
    A sheet fused body manufacturing apparatus including a command means for instructing the start of processing of a sheet laminated body based on a signal from the pulse counting means.
18. The sheet laminate is configured to be machined based on the machining start signal output from the command means.
    The sheet fusion product manufacturing apparatus according to claim 17, wherein in the counting time setting means, the time from the output of the processing start signal to the start of processing of the sheet laminate is set as the counting time.
19. The sheet fusion body in the manufacturing method according to any one of claims 10 to 16 is a pants-type disposable diaper.
    Pants-type disposable diapers manufactured by the above manufacturing method.

Images