JP2007237649A - Bag making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately copes with the case where the bottom material is not accurately inserted, in a bag making machine which passes a bottom material 8 through a cut and opened part 7 of a body material and inserts it into the body material, in each operation of the intermittent feeding of the body material 2 with a body part 3 and a side gusset part 4. <P>SOLUTION: The bottom material comprises a bottom gusset part, an auxiliary gusset part, and a protrusive part. When the bottom material is inserted into the body material, the bottom gusset part and the auxiliary gusset part are arranged between both layers of the body part; the side gusset part is arranged between both layers of the auxiliary gusset part; and the protrusive part is protruded from the cut and opened part of the body material. After the insertion of the bottom material, the cut and opened part and the protrusive part are irradiated with light from a light source 25; the light is blocked by one layer of the body part; the shadow of one layer of the body part appears on the surface of the protrusive part; the light is blocked by a leading end of the protrusive part; and the shadow of the leading end of the protrusive part appears on the surface of the body material. Additionally, each of the shadows is detected by an optical sensor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bag making machine for producing plastic bags.

  A plastic bag having a body portion, a side gusset portion, and a bottom gusset portion is known. The bag making machine has been developed and proposed so far. That is described in Japanese Patent Application Laid-Open No. 2001-158056 (Patent Document 1). This is the same as that described in Japanese Patent Laid-Open No. 2003-311853 (Patent Document 2).

  In the bag making machine of each publication, the body material is intermittently fed by a certain length. The body has a body part and a side gusset part. Further, for each intermittent feed of the body material, one layer of the body portion and both layers of the side gusset portion are cut by the cutter to form a slit opening portion of the body material. Further, after forming the slit, the body is intermittently fed by the other layer of the trunk, and for each intermittent feed, the bottom material passes through the slit of the trunk and is inserted into the trunk. The bottom material has a bottom gusset portion and an auxiliary gusset portion. When the bottom material is inserted into the body, the bottom gusset portion and the auxiliary gusset portion are disposed between both layers of the body portion on the downstream side of the cut portion in the body feed direction, and the side gusset portion is the auxiliary gusset portion. Between the two layers. Thereafter, the body and the bottom material are intermittently fed by the other layers of the body, and each time the intermittent feeding is performed, the body and the bottom material are heat-sealed by the heat sealing device and cut by the cutter. Thereby, a plastic bag is manufactured.

  In this case, the bottom material is inserted into the interior of the body every time the body is intermittently fed, but the problem is the state of insertion. As described above, after the bottom material is inserted, the body and the bottom material are heat sealed by the heat sealing device, and when the bottom material is not properly inserted, the body and the bottom material are accurately heat sealed. This may result in leakage of the plastic bag after the plastic bag is manufactured. This is fatal for plastic bags. Therefore, there is a strong demand for taking countermeasures.

Accordingly, the present invention provides the body part with the body part and the side gusset part, and intermittently feeds the body part by a fixed length, and each layer of the body part is intermittently fed by the cutter with both layers of the body part and the side gusset part. In the bag making machine that inserts the bottom material through the body slit and inserts it into the body for each intermittent feed of the body, the bottom material is accurately It was made for the purpose of accurately responding to it when it was not inserted into the box.
Japanese Patent Laid-Open No. 2001-158056 JP 2003-311853 A

  According to this invention, the bottom member has a bottom gusset portion, an auxiliary gusset portion, and a protruding portion. When the bottom material is inserted into the body, the bottom gusset portion and the auxiliary gusset portion are disposed between both layers of the body portion on the downstream side of the cut portion in the body feed direction, and the side gusset portion is the auxiliary gusset portion. The projecting portion projects from the slit opening of the trunk on the upstream side of the slit in the trunk feeding direction. Further, after the bottom material is inserted, the slit portion and the protruding portion are irradiated by the light source. The light source is located downstream of the slit portion in the body feed direction, and irradiates the slit portion and the protruding portion obliquely. Therefore, the light is blocked by the one layer of the trunk, and the shadow is generated on the surface of the protrusion, the light is blocked by the tip of the protrusion, and the shadow is generated on the surface of the trunk. Further, each shadow is detected by the optical sensor. Further, the control device is connected to the optical sensor, the detection signal of the optical sensor is processed by the control device, and the insertion state of the bottom material is determined by the positional relationship of each shadow. And when a bottom material is not inserted correctly, a control apparatus copes with it.

  Examples of the present invention will be described below.

  FIG. 1 shows a bag making machine according to the present invention. In this bag making machine, a pair of feed rollers 1 are used for the feed mechanism, and the body 2 is guided between the feed rollers 1 as in the bag making machine disclosed in Japanese Patent Application Laid-Open No. 2001-158056. 1 rotates and the body 2 is intermittently fed by a certain length. The body 2 is made of a plastic film and has a body 3 and a side gusset 4. The body part 3 is overlapped in two layers, and the side gusset part 4 is formed along both side edges of the body part 3, folded between both layers of the body part 3, and overlapped in two layers.

  Further, as in the bag making machine disclosed in the publication, the cutter 5 is provided in the feeding path of the body 2, the body 2 passes through the dancer roller 6, is guided to the cutter 5, and the cutter 5 is intermittently fed every time the body 2 is intermittently fed. As a result, one layer of the trunk portion 3 and both layers of the side gusset portion 4 are cut to form the slit portion 7 of the barrel 2. Therefore, after that, when the feed roller 1 rotates, the body 2 is intermittently fed by the other layer of the body 3. In this embodiment, both the upper layer of the body part 3 and the side gusset part 4 are cut by the cutter 5 to form the slit part 7 of the body material 2, and then when the feed roller 1 rotates, The body 2 is intermittently fed by the lower layer. The cutter 5 consists of a Thomson blade.

  Furthermore, after forming the slit 7, the bottom material 8 passes through the slit 7 of the trunk 2 and is inserted into the trunk 2 every time the trunk 2 is intermittently fed. For example, as in the bag making machine disclosed in the publication, the bottom material 8 is supplied from the raw fabric 9, passes through the dancer roller 10, is guided between the pair of feed rollers 11, and the feed roller 11 is rotated by the drive motor. Is intermittently fed by a certain length. Further, every time the bottom material 8 is intermittently fed, the bottom material 8 is sandwiched between the heater or press 12 and the cradle 13, and a fold is formed in the bottom material 8. Thereafter, every time the bottom material 8 is intermittently fed, the bottom material 8 is cut by the cutter 14, and this is dropped into the holder 15 and held.

  Further, similarly to the bag making machine disclosed in the publication, the barrel 2 is guided to the guide roller 16 at the downstream position in the barrel feed direction of the cutter 5, and the cut-off portion 7 is guided by the guide roller 16 every intermittent feed of the barrel 2. The body 2 is curved by the guide roller 16 and the cut-out portion 7 is opened. Further, a spatula 17 is used for the bottom material insertion mechanism, the spatula 17 is pressed against the bottom material 8, the bottom material 8 is pushed out from the holder 15, passes through the guide 18, passes through the slit 7 of the body 2, 2 is inserted. Further, at the same time, the bottom member 8 is guided and bent by the guide 18, and the bottom gusset portion 19 and the auxiliary gusset portion 20 are formed by the bottom member 8 as shown in FIG. The bottom material 8 is made of a plastic film. Regarding the relationship between the bottom gusset portion 19 and the auxiliary gusset portion 20, the bottom gusset portion 19 is overlapped in two layers, and at both ends, the auxiliary gusset portion 20 is bent at an angle of 45 °, and between the two layers of the bottom gusset portion 19 It is folded and superimposed on two layers. When the bottom material 8 is inserted into the body 2, the bottom gusset portion 19 and the auxiliary gusset portion 20 are disposed between both layers of the body portion 3 on the downstream side of the cut portion 7 in the body feed direction. The gusset part 4 is arranged between both layers of the auxiliary gusset part 20.

  Thereafter, similarly to the bag making machine disclosed in the publication, the body 2 and the bottom material 8 are ultrasonically sealed or heat-sealed by the ultrasonic sealing device or the heat sealing device 21 and temporarily fixed. Further, after temporarily fixing the body 2 and the bottom material 8, it is intermittently fed by the feed roller 1, and the body material 2 and the bottom material 8 are heat-sealed by the heat sealing device 22 for each intermittent feed. The body 3 and the bottom gusset part 19, and the auxiliary gusset part 20 and the side gusset part 4 are heat-sealed between the body 2 and the bottom material 8. Furthermore, the lower layer of the trunk | drum 3 is cut | disconnected by the cutter 23 in the slit part 7 of the trunk | drum 2 for every intermittent feed after heat sealing. Thereby, a plastic bag is manufactured.

  Furthermore, in this bag making machine, when the bottom material 8 is intermittently fed and cut by the feed roller 11 and the cutter 14, the length is selected to be slightly larger than twice the length of the bottom gusset portion 19. The width is chosen to correspond to a large selected length. Thereafter, the bottom material 8 is guided by the guide 18, bent and folded. Therefore, the protruding portion 24 is formed by the bottom material 8, and the bottom material 8 has the protruding portion 24 in addition to the bottom gusset portion 19 and the auxiliary gusset portion 20. The projecting portion 24 is an extension of the bottom gusset portion 19 and the auxiliary gusset portion 20, and both side edges thereof are inclined in a tapered shape. When the bottom member 8 passes through the slit portion 7 of the trunk member 2 and is inserted into the trunk member 2, the projecting portion 24 is located upstream of the slit member 7 in the trunk member feeding direction. Protrude from. The protruding length L is 0.1 to 10 mm.

  Furthermore, in this bag making machine, the slit portion 7 and the protruding portion 24 are irradiated by the light source 25 after the bottom material 8 is inserted. As shown in FIG. 2, the light source 25 is positioned on the downstream side of the cut portion 7 in the body feeding direction, and irradiates the cut portion 7 and the protruding portion 24 obliquely. Therefore, the light is blocked by the cut edge of the single layer of the body 3, the shadow 26 is generated on the surface of the protrusion 24, the light is blocked by the tip of the protrusion 24, and the shadow 27 is formed on the surface of the body 2. Arise. The shadow 26 extends along the cut edge of one layer of the body 3 and forms a straight line, and the shadow 27 extends along the tip of the protrusion 24 and forms a straight line. Furthermore, the shadows 26 and 27 are detected by the optical sensor 28.

  In this embodiment, a CCD camera is used as the optical sensor 28, and the light source 25 and the optical sensor 28 are provided in the feeding path of the body 2 and face the upper surface of the body 2. After the bottom material 8 is inserted and temporarily fixed, every time the body 2 is intermittently fed, the slit 7 and the protrusion 24 reach the installation positions of the light source 25 and the CCD camera 28, and the light source 25 cuts the slit 7 and the protrusion. 24 is irradiated. Therefore, light is blocked by the upper cutting edge of the trunk 3, and its shadow 26 is generated on the upper surface of the protrusion 24, and light is blocked by the tip of the protrusion 24, and its shadow 27 is generated on the upper surface of the trunk 2. . Then, the shadows 26 and 27 are detected by the CCD camera 28. Thereafter, for every intermittent feed of the body 2, the body 2 and the bottom material 8 reach the installation position of the heat seal device 22, and the body 2 and the bottom material 8 are heat sealed by the heat seal device 22.

  Further, the control device 29 is connected to the CCD camera 28, and the detection signal of the CCD camera 28 is processed by the control device 29, and the insertion state of the bottom material 8 is determined by the positional relationship between the shadows 26 and 27. The control device 29 is a computer. For example, before the operation of the bag making machine, the operator selects the protrusion length L of the protrusion 24, sets the allowable range thereof, and inputs the selected value and the set value to the computer 29. Further, after the operation, the detection signal of the CCD camera 28 is processed by the computer 29, and the distance between the shadows 26 and 27 is calculated. Furthermore, it is collated with the selected protrusion length L, and it is determined whether or not the difference is within the set range. At the same time, it may be determined whether the parallelism between the shadows 26 and 27 or other elements are within the set range. Thereby, the insertion state of the bottom material 8 is determined. And when the bottom material 3 is not inserted correctly, the control apparatus 29 copes with it.

  Therefore, in the case of this bag making machine, when the bottom material 8 is not properly inserted, it is possible to accurately cope with it. For example, similarly to the bag making machine disclosed in Japanese Patent Application Laid-Open No. 2004-160780, the computer 29 is connected to the defective bag removing mechanism, and when the bottom material 8 is not properly inserted, the computer 29 drives the removing mechanism to Can be eliminated. The cutter 23 may be controlled by the computer 29 so that the defective bag is not cut from the adjacent bag and is discharged in a continuous state to the adjacent bag.

  Further, in this bag making machine, the linear shadows 26 and 27 are generated on the surface of the protruding portion 24 and are generated on the surface of the body 2 as described above, and it is easy to detect it by the CCD camera 28. It is. It is also easy to determine the insertion state of the bottom material 8 based on the positional relationship between the shadows 26 and 27. Therefore, the insertion state of the bottom material 8 can be accurately determined.

  Furthermore, in this bag making machine, the bottom material 8 is guided, bent, and folded by the guide 18 as described above. And when it is inserted into the inside of the trunk | drum 2, when the bottom material 8 is not correctly folded, it will affect the insertion state of the bottom material 8, and it will affect the shadow 27 of the protrusion part 24. To do. Therefore, it can be detected by the CCD camera 28.

  In addition, about the protrusion part 24 of the bottom material 8, when the lower layer of the trunk | drum 3 is cut | disconnected by the cutter 23 in the slit part 7 of the trunk | drum 2, the projection part 24 of the bottom material 8 is also cut | disconnected and removed by the cutter 23. There is no problem. Further, the protruding portion 24 is an extension of the bottom gusset portion 19 and the auxiliary gusset portion 20, and both side edges thereof are inclined in a tapered shape as described above. Therefore, when the bottom material 8 is inserted into the body 2, the projecting portion 24 engages with the intersection 30 of the body portion 3 and the side gusset portion 4 in the slit 7 of the body 2, and the projecting portion 24 A bottom material 8 is positioned and preferred.

  Similar to the bag making machine disclosed in Japanese Patent Application Laid-Open No. 2003-311853, the bottom material 8 is bent by a trapezoidal or triangular plate and a folding plate, and the bottom gusset portion 19, the auxiliary gusset portion 20, and the protruding portion 24 are formed by the bottom material 8. You may do it. Then, it is passed through the slit 7 of the trunk 2 and inserted into the trunk 2. Thereafter, the slit 7 and the protrusion 24 may be irradiated by the light source 25 to generate the shadows 26 and 27, and the shadows 26 and 27 may be detected by the optical sensor 28.

It is a side view which shows the Example of this invention. It is an enlarged view which shows the relationship between the light source of FIG. 1, and a slit part. It is a top view of the trunk | drum and bottom material of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feed roller 2 Body 3 Body 4 Side gusset part 5 Cutter 7 Cut-off part 8 Bottom material 17 Spatula 19 Bottom gusset part 20 Auxiliary gusset part 25 Light source 26, 27 Shadow 28 Optical sensor 29 Control device

Claims (1)

A feed mechanism that intermittently feeds the body member having the body part and the side gusset part by a fixed length;
For each intermittent feed of the body, a cutter that cuts both layers of the body part and the side gusset part, and forms a slit part of the body,
After the formation of the slit, for each intermittent feed of the body, a bottom material having a bottom gusset part, an auxiliary gusset part and a protrusion is passed through the slit part of the body, inserted into the body, The bottom gusset portion and the auxiliary gusset portion are disposed between both layers of the trunk portion, the side gusset portion is disposed between both layers of the auxiliary gusset portion, and the bottom gusset portion and the auxiliary gusset portion are disposed downstream of the slit opening direction of the barrel material. On the upstream side in the body feeding direction, a bottom material insertion mechanism that causes the protruding portion to protrude from the slit portion of the body,
After the bottom material is inserted, it is located downstream of the slit portion in the barrel feed direction, irradiates the slit portion and the projecting portion obliquely, and light is blocked by the cut end of one layer of the barrel portion, and the shadow Is generated on the surface of the protrusion, the light is blocked by the tip of the protrusion, and the shadow is generated on the surface of the body,
An optical sensor for detecting each shadow;
Control connected to the optical sensor, processing the detection signal of the optical sensor, determining the insertion state of the bottom material according to the positional relationship of the shadows, and controlling the situation when the bottom material is not properly inserted A bag making machine consisting of equipment.

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