JP2008023666A - Bag forming unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag forming unit capable of surely recovering cutting chips which are generated when a bag body is separated from a band-shaped film by a cutting blade. <P>SOLUTION: A bag forming unit 1 includes the cutting blade 21 for separating the bag body W from the band-shaped film F; a doctor device 30 for peeling off the cutting chips K adhering to the cutting blade 21, and a recovery portion 40 for recovering the cutting chips K. The bag body W is separated from the band-shaped film F by the movement of the cutting blade 21 from a refuge position to a cutting position. The cutting chips K which are generated during a cutting process and adhering to the cutting blade 21 are peeled off by the doctor device 30 provided at the cutting blade 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bag making unit that manufactures a bag body by cutting with a cutting blade from a two-layer belt film conveyed in the longitudinal direction, and in particular, the bag body is cut off from the belt film with a cutting blade. The present invention relates to a bag making unit that can reliably collect cutting waste that is sometimes generated.

  Conventionally, for example, a pair of films are overlaid, and each side of the overlaid film is heat-sealed and a spout is attached to the upper edge, such as medicine, retort food, liquid detergent, etc. Bags that can be accommodated are known. As a bag-making unit for producing the bag body, two layers of belt-like films are intermittently conveyed in the longitudinal direction, and a part of these belt-like films is heat-sealed using a heat-sealing hot plate for each intermittent feed, What cuts | punches and punches into a predetermined dimension and shape with cutting mechanisms, such as a cutter, is known (for example, refer patent document 1 etc.).

  A general aspect of the bag making unit will be described with reference to FIGS. FIG. 5 is a top view showing an outline of the overall configuration of the bag-making unit, and FIG. 6 is an enlarged view of the region M in FIG. 5, and shows the vicinity of the portion previously punched and removed by the die set in the belt-like film. It is a figure which shows the state at the time of cutting with a cutting blade. Moreover, FIG. 7 is a figure which shows the bag body manufactured by cut | disconnecting only once with a cutting blade with respect to a strip | belt-shaped film, and FIG. 8 is twice with a cutting blade with respect to a strip | belt-shaped film. It is a figure which shows the bag body manufactured by cut | disconnecting by cutting and cutting.

  As shown in FIG. 5, in the bag making unit, the two-layer belt-like film F is intermittently conveyed in the longitudinal direction, specifically, in the arrow direction (left direction) in FIG. Here, “intermittently transport” refers to repeatedly performing an operation of stopping transport for a certain period after continuously transporting a certain amount of movement. Moreover, the strip | belt-shaped film F shown in FIG. 5 becomes what the side edge part and bottom edge part in the location where the double row bag body W should be formed already heat-sealed with the heat-sealing hot plate which is not shown in the front | former stage. (In FIG. 5, illustration of the heat-sealed part in the strip | belt-shaped film F is abbreviate | omitted).

  In the bag making unit shown in FIG. 5, the two-layer belt-like film F conveyed intermittently is sent to the die set 60. And each ceiling part in the location in which the two rows of bag bodies W in the strip | belt-shaped film F should each be formed is punched collectively by the ceiling die set 60a. At the same time, the bottom corners of the belt-like film F where the two rows of bag bodies W are to be formed are each punched out by the bottom corner die set 60b with, for example, a rounded blade. By punching with the ceiling die set 60a, the ceiling part and the mouth part of the bag W to be finally produced are formed. On the other hand, by punching with the bottom corner die set 60b, the bottom corner portion of the bag body W to be finally manufactured becomes rounded, and finger laceration can be prevented from the viewpoint of the PL method. (See FIG. 8 and the like).

  Thereafter, the band-shaped film F punched by the ceiling die set 60a and the bottom corner die set 60b is sent to a pair of upper and lower cutting blades 21 and 22 disposed so as to sandwich the band-shaped film F. Here, the lower cutting blade 22 located below the belt-like film F is fixed in position. On the other hand, the upper cutting blade 21 positioned above the lower cutting blade 22 is automatically adjustable between a retracted position whose tip is above the belt-like film F and a cutting position near the lower cutting blade 22. The bag W is separated from the belt-like film F by moving from the retracted position to the cutting position.

  In this way, the production unit shown in FIG. 5 can produce two bag bodies W in parallel from the two-layered film F. In addition, although the ceiling part of the bag body W manufactured by the manufacturing unit shown in FIG. 5 is not heat-sealed, it is an opening part. This is because the upper edge portion of the bag body W is separately heat sealed by another unit.

Japanese Patent Laid-Open No. 6-170989

  However, as shown in FIG. 6, it is located between a location where punching is performed from the strip-shaped film F by the ceiling die set 60 a or the bottom corner die set 60 b and a location where the strip-shaped film F is separated by the upper cutting blade 21. Deviation (pitch deviation) may occur. As a result, after the upper cutting blade 21 cuts off the strip-shaped film F, a so-called “shoulder” or “horn” projection as shown by reference D in FIG. 6 remains. Become.

  For this reason, as shown in FIG. 7, about the bag body W 'manufactured, the projection part D will be formed in a side edge part, and there exists a possibility that a finger may be torn by such a projection D. FIG.

  In order to solve this problem, when cutting the band-shaped film F with the upper cutting blade 21, the band-shaped film F was once cut with the upper cutting blade 21 as shown by the solid line portion in FIG. Thereafter, the upper cutting blade 21 is moved by a small amount in the reverse direction (right direction in FIG. 5) with respect to the transport direction of the belt-like film F, and thereafter, with the upper cutting blade 21 as shown by the chain line portion in FIG. There is a case where a two-time cutting method of cutting again is used. By using such a two-time cutting method, it is possible to prevent the protrusion D as shown in FIG. 7 from being formed on the side edge of the bag body W.

  However, when the above-described two-time cutting method is used in the width direction cutting of the band-shaped film F, as shown in FIG. 8, the portion 24a where the band-shaped film F has been cut off by the first cutting process, as shown in FIG. There is a problem that a cutting residue K is generated between the portion 24b and the portion 24b that has been separated by the second cutting step.

  The cutting residue K as shown in FIGS. 5 and 8 is collected by a dust collector installed immediately below the cutting blades 21 and 22. However, when the cutting waste K is charged with static electricity or the belt-like film F after the heat sealing process is not sufficiently cooled and the cutting waste K has heat, the cutting waste K has an upper cutting edge. May adhere to the surface of 21. Since the cutting residue K has a very small width and is extremely light, it easily adheres to the surface of the upper cutting blade 21, and when it adheres to the upper cutting blade 21, it hardly peels naturally. For this reason, when the upper cutting blade 21 performs cutting a plurality of times, the cutting residue K is sequentially attached to the upper cutting blade 21.

  If a large number of cutting pieces K adhere to the upper cutting blade 21 in this way, the cutting pieces K are scattered on a bag discharge conveyor (not shown) as a discharge destination of the bag W, and the bag W There is a risk that the cutting residue K will be mixed into the bundle. Further, a large amount of the cutting residue K adhering to the upper cutting blade 21 may fall on the floor or the like without being accommodated in the dust collector, and in this case, there is a problem that the surrounding environment of the bag making unit is soiled. .

  The present invention has been made in consideration of such points, and provides a bag-making unit capable of reliably collecting cutting waste generated when a bag body is cut off from a belt-like film by a cutting blade. For the purpose.

  The present invention is a transport unit that transports a belt-shaped film in the longitudinal direction, and a cutting blade for cutting a bag body from the belt-shaped film transported by the transport unit, the leading end of which is above the belt-shaped film. And a cutting blade that separates the bag from the strip film by moving from the retracted position to the cutting position, and the cutting blade. A doctor device for separating the cutting residue attached to the cutting blade which is generated when the cutting blade is cut off the bag body from the belt-shaped film, and is installed below the cutting blade. A bag making unit comprising: a collection unit for collecting cutting waste.

  According to such a bag making unit, since the doctor device forcibly peels off the cutting residue adhering to the cutting blade, it is possible to prevent a large number of cutting residues from adhering to the cutting blade. For this reason, it can prevent that cutting waste mixes in the bag body cut | disconnected from the strip | belt-shaped film, and can collect | recover the said cutting waste reliably.

  In the bag making unit, the doctor device includes a doctor blade that contacts the surface of the cutting blade, and a telescopic mechanism that causes the doctor blade to move forward and backward along the surface of the cutting blade. The doctor blade preferably peels off the cutting residue adhering to the surface of the cutting blade when the blade moves forward. Thereby, the cutting residue adhering to the surface of the cutting blade can be reliably peeled off with a simple structure.

  In the bag making unit, the doctor blade is preferably made of a non-conductive member. Since the doctor blade is designed not to be charged with static electricity, it prevents the cutting blade from adhering to the doctor blade when the doctor blade peels off the cutting waste on the surface of the cutting blade. be able to.

  In said bag making unit, it is preferable that the said doctor blade is comprised so that it may extend in the direction orthogonal to the conveyance direction of the said strip | belt-shaped film. Thus, it is possible to prevent the peeled cut residue from being scattered in front of the bag making unit (in the transport direction of the belt-like film).

  In the bag making unit, the transport unit intermittently transports the belt-shaped film, and the cutting blade moves from the retracted position to the cutting position when the belt-shaped film is stopped. Then, it returns to the retracted position, moves in the forward direction or the reverse direction with respect to the transport direction of the strip film, and is configured to cut the strip film twice by moving again below the strip film. Preferably it is. As a result, it is possible to prevent the protrusions from being formed on the side edges of the bag body that is finally manufactured, and the cutting residue generated when such a two-time cutting method is used. It can be reliably recovered.

  The present invention relates to a transport unit that intermittently transports a belt-shaped film in the longitudinal direction, and a cutting blade for cutting a bag body from the belt-shaped film transported by the transport unit, the tip of which is above the belt-shaped film. A cutting blade that is movable between a position and a cutting position below the belt-like film, and that separates the bag from the belt-like film by moving from the retracted position to the cutting position; and A doctor device installed on the cutting blade for peeling off the cutting residue generated when the cutting blade separates the bag from the belt-like film and adheres to the cutting blade, and contacts the surface of the cutting blade A doctor blade and a telescopic mechanism for moving the doctor blade forward and backward along the surface of the cutting blade, and when the doctor blade performs forward movement, the doctor blade -A blade is a doctor device that peels off the cutting residue adhering to the surface of the cutting blade, a recovery unit that is installed below the cutting blade and collects the cutting residue, the cutting blade, and the doctor A control device for controlling the device, and the cutting blade moves from the retracted position to the cutting position and returns to the retracted position again when the strip film is stopped by the control of the control device. Then, it moves in the forward direction or the reverse direction with respect to the transport direction of the belt-like film, and cuts the belt-like film twice by moving again below the belt-like film, and the doctor device uses the cutting blade 1 The extension mechanism does not advance the doctor blade after the second cutting, and the extension mechanism advances the doctor blade after the second cutting. A bag making unit, characterized in Rukoto.

  According to the bag-making unit of the present invention, since the doctor blade is advanced only when cutting waste occurs, the number of times the doctor device is driven can be minimized, and energy saving and running cost reduction are achieved. Can be achieved.

  In the bag making unit, the cutting blade has a vertical surface extending in a direction perpendicular to the transport direction of the belt-like film, and an inclined surface extending in an acute angle direction with respect to the vertical surface, and the doctor device is It is preferable that the cutting residue adhering to the inclined surface of the cutting blade is peeled off.

  The present invention relates to a transport unit that intermittently transports a belt-shaped film in the longitudinal direction, and a cutting blade for cutting a bag body from the belt-shaped film transported by the transport unit, the tip of which is above the belt-shaped film. It can be moved between the position and the cutting position below the belt-like film. By moving from the retracted position to the cutting position, the bag body is separated from the belt-like film, and an air ejection hole is further formed. A cutting device installed on the cutting blade, and a doctor device for peeling off the cutting residue that is generated when the cutting blade separates the bag from the belt-like film and adheres to the cutting blade; A doctor blade in contact with the surface of the cutting blade; and a telescopic mechanism for moving the doctor blade forward and backward along the surface of the cutting blade. When exercising, this doctor blade sends air to a doctor device that peels off the cutting residue adhering to the surface of the cutting blade, and an air ejection hole formed in the cutting blade, and from this air ejection hole A bag making unit comprising: an air ejection mechanism that ejects air to the outside of the cutting blade; and a collection unit that is disposed below the cutting blade and collects the cutting residue. .

  According to the bag making unit of the present invention, the direction of the air blown to the outside of the cutting blade is changed by the doctor blade as the doctor blade moves forward, whereby the air is applied to the surface of the cutting blade. It will hit the adhering cutting waste. In this way, not only the cutting debris is peeled directly by the doctor blade, but also the air sent from the air ejection mechanism is applied to the cutting debris to assist the delamination from the cutting blade. The attached cutting residue can be peeled off more reliably.

  According to the bag making unit of the present invention, it is possible to reliably collect the cutting residue generated when the bag body is separated from the belt-like film by the cutting blade.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing an embodiment of a bag making unit according to the present invention.
Among these, FIG. 1 is a side view showing an outline of the configuration in the vicinity of the cutting blade in the bag making unit of one embodiment of the present invention, and FIG. 2 is a view in the vicinity of the cutting blade in the bag making unit shown in FIG. FIG. 3 is a side view showing a state after the doctor blade has moved forward with respect to the configuration, and FIG. 3 is a front view of the configuration in the vicinity of the cutting blade in the bag making unit shown in FIG. It is a view).
In addition, in referring to FIG. 1 thru | or FIG. 3, the same code | symbol is attached | subjected and demonstrated to the same member as the bag making unit shown in FIG.

  As shown in FIGS. 1, 3, and 5, the bag making unit 1 includes a film transport device 10 that intermittently transports the belt-shaped film F in the longitudinal direction, and a bag body W from the belt-shaped film F transported by the film transport device 10. A pair of upper and lower cutting blades 21 and 22 for separating the upper cutting blade 21 and a doctor device 30 that peels off the cutting residue K attached to the upper cutting blade 21 and an upper cutting blade 21. And a dust collecting device 40 for collecting the cutting residue K peeled from the upper cutting blade 21. Furthermore, the bag making unit 1 includes a control device 50 that controls the pair of cutting blades 21 and 22 and the doctor device 30.

  Hereinafter, each component of the bag making unit 1 will be described in detail.

  For example, the film transporting apparatus 10 includes a plurality of sets of a pair of rollers (see FIG. 1 and the like) that sandwich the belt-like film F, and intermittently transports the belt-like film F in the longitudinal direction as shown in FIG. It has become. As described above, the belt-like film F transported by the film transport device 10 has two side-films overlapped, and further, the side edge and the bottom edge at the locations where two rows of bag bodies W are to be formed. It has already been heat sealed.

  As shown in FIGS. 1 and 5, a pair of upper and lower cutting blades 21, 22 are disposed on the downstream side of the die set 60 in the transport direction of the strip film F so as to sandwich the strip film F. Specifically, as shown in FIG. 3, two combinations of the cutting blades 21 and 22 are installed in parallel along the width direction of the strip film F. FIG. 3 is a view of the configuration of FIG. 1 as viewed from the left as described above.

  The upper cutting blade 21 has a vertical surface 21a extending in a direction orthogonal to the transport direction of the belt-like film F, and an inclined surface 21b extending in an acute angle direction with respect to the vertical surface 21a. Further, a front edge 21c to be a sharp cutting edge is formed at a location where the vertical surface 21a and the inclined surface 21b intersect. The upper cutting blade 21 is movable between a retracted position where the front edge 21c is above the band-shaped film F and a cutting position where the front edge 21c is below the band-shaped film F.

  The lower cutting blade 22 is installed below the belt-like film F and does not move in the vertical direction of FIG. The lower cutting blade 22 extends in a direction orthogonal to the conveyance direction of the belt-like film F, and has a vertical surface 22a positioned substantially on the same plane as the vertical surface 21a of the upper cutting blade 21, and an acute angle with respect to the vertical surface 22a. And an inclined surface 22b extending in the direction. Further, a front edge 22c to be a sharp cutting edge is formed at a location where the vertical surface 22a and the inclined surface 22b intersect.

  In such a pair of cutting blades 21, 22, the upper cutting blade 21 moves from the retracted position to the cutting position, so that the belt-like film F sandwiched between the front edge 21 c and the front edge 22 c is cut. Become.

  The combination of the pair of cutting blades 21 and 22 is controlled as follows by a control device 50 described later. That is, when the belt-like film F is stopped, the upper cutting blade 21 moves from the retracted position to the cutting position, performs the first cutting, returns to the retracted position, and the combination of the pair of cutting blades 21 and 22 Is moved by a small amount in the direction opposite to the conveyance direction of the belt-like film F (rightward in FIGS. 1 and 5), and the upper cutting blade 21 is moved downward again to perform the second cutting. The combination of the cutting blades 21 and 22 is controlled by the control device 50.

  When such a two-time cutting method is used, a cutting residue K (see FIG. 8) is generated as described above, and this cutting residue K is an inclined surface of the upper cutting blade 21 as shown in FIG. It may adhere to 21b.

  The doctor device 30 is installed on the upper cutting blade 21 as shown in FIG. The doctor device 30 is configured to peel the cutting residue K that is generated when the upper cutting blade 21 separates the bag body W from the belt-like film F and adheres to the inclined surface 21 b of the upper cutting blade 21. Specifically, the doctor device 30 includes a doctor blade 31 provided so as to contact the inclined surface 21b of the upper cutting blade 21, a telescopic mechanism 32 having the doctor blade 31 attached to the tip, and a base of the telescopic mechanism 32. And a base member 33 in which the end is accommodated. Further, a pressing member 34 for attaching the doctor device 30 to the upper cutting blade 21 is provided.

  The doctor blade 31 is composed of a non-conductive member that does not charge static electricity. Alternatively, the surface of the doctor blade 31 may be covered with a cloth effective for static elimination, or the surface of the doctor blade 31 may be uneven so that static electricity is not charged. Since the doctor blade 31 is not charged with static electricity, when the doctor blade 31 peels off the cutting residue K on the inclined surface 21b, the cutting residue K adheres to the doctor blade 31. This can be prevented. Further, the doctor blade 31 extends downward so as to be orthogonal to the transport direction of the belt-like film F as shown in FIG. Thus, when the cutting residue K is peeled off from the inclined surface 21b, the cutting residue K can be prevented from scattering to the left in FIG.

  The telescopic mechanism 32 moves the doctor blade 31 forward and backward along the inclined surface 21 b of the upper cutting blade 21. The telescopic mechanism 32 is accommodated in the base member 33, and when the telescopic mechanism 32 moves the doctor blade 31 forward as shown in FIGS. 1 and 2, the doctor blade 31 is placed on the inclined surface 21 b of the upper cutting blade 21. The attached cutting residue K is peeled off. The stroke length of the doctor blade 31 by the expansion / contraction mechanism 32 is set within a range in which the doctor blade 31 does not exceed the front edge 21 c of the upper cutting blade 21.

  Here, the doctor device 30 is controlled as follows by a control device 50 described later. That is, in the above-described two-time cutting method, the expansion / contraction mechanism 32 does not advance the doctor blade 31 after the first cutting by the upper cutting blade 21, and the expansion / contraction mechanism 32 advances the doctor blade 31 after the second cutting. It is like that.

  As shown in FIG. 1 and the like, the dust collector 40 is installed directly below the upper cutting blade 21, and collects the cutting residue K peeled from the upper cutting blade 21 by the doctor device 30. Specifically, the dust collector 40 has a damper on the upper part, and the cutting waste K that naturally falls from the upper cutting blade 21 is received by this damper.

As described above, the control device 50 is communicatively connected to the upper cutting blade 21 and the doctor device 30, and controls the upper cutting blade 21 and the doctor device 30. As described above, the control content of the control device 50 is that the upper cutting blade 21 is cut twice with respect to the strip film F, and the doctor device 30 tilts the upper cutting blade 21 after the second cutting. The cutting residue K attached to the surface 21b is removed.
Specifically, a stock sensor 51 is disposed above the upper cutting blade 21, and the stock sensor 51 detects the movement of the pair of cutting blades 21 and 22. When the pair of cutting blades 21 and 22 move a small amount after the first cutting process, the stock sensor 51 detects this and sends this information to the control device 50. . Thus, the control device 50 can detect that the next cutting process by the upper cutting blade 21 is the second cutting, and sends a command related to the removal of the cutting residue K to the doctor device 30. Become. In detecting the movement of the pair of cutting blades 21 and 22, other detection means such as a contact type limit switch may be used instead of using a stock sensor as shown in FIG.

  Next, operation | movement of the bag making unit 1 of this Embodiment which consists of such a structure is demonstrated.

  First, as shown in FIG. 5, in the bag making unit 1, the two-layered film F is intermittently conveyed by the film conveying apparatus 10 in the longitudinal direction, specifically, in the arrow direction (left direction) in FIG. 5. The intermittently transported two-layer belt-like film F is sent to the die set 60, and the belt-like film F is simultaneously punched by the ceiling die set 60a and the bottom corner die set 60b.

  Thereafter, the strip-shaped film F punched by the ceiling die set 60a and the bottom corner die set 60b is sent to the pair of upper and lower cutting blades 21 and 22. The band-shaped film F is cut twice. Specifically, when the control device 50 controls the pair of cutting blades 21 and 22, the upper cutting blade 21 first cuts the strip film F for the first time, and then the pair of cutting blades 21 and 22 are strip-shaped. The upper cutting blade 21 further cuts the band-shaped film F a second time by moving a small amount in the direction opposite to the conveying direction of the film F. Thereby, as shown in FIG. 8, it can prevent that the protrusion D (refer FIG. 7) is formed in a side edge part about the bag body W finally manufactured.

  Here, when the above-described two-time cutting method is used, as shown in FIG. 8, the part 24a where the strip-shaped film F is separated by the first cutting process and the second cutting process are separated. A cutting residue K is generated between the broken portion 24b. The cutting residue K may adhere to the inclined surface 21b of the cutting blade 21 as shown in FIG.

  The cutting residue K attached to the inclined surface 21b of the cutting blade 21 is peeled off from the inclined surface 21b by the doctor device 30. Specifically, the control device 50 controls the doctor device 30, so that the telescopic mechanism 32 moves the doctor blade 31 forward along the inclined surface 21 b after the second cutting process by the upper cutting blade 21. The cutting residue K attached to the inclined surface 21b by the blade 31 is peeled off. The cutting residue K peeled off from the inclined surface 21 b naturally falls downward and is finally collected by the dust collector 40. Here, as described above, the doctor blade 31 extends downward so as to be orthogonal to the transport direction of the belt-like film F, so that the cut trim K is peeled forward of the bag making unit 1 (left side in FIG. 1). Will not scatter.

  As described above, according to the bag making unit 1 of the present embodiment, the upper cutting blade 21 is moved from the retracted position to the cutting position, whereby the bag body W is separated from the belt-like film F and is generated during this cutting process. The cutting device K attached to the upper cutting blade 21 is peeled off by the doctor device 30 installed on the upper cutting blade 21. As a result, it is possible to prevent a large amount of the cutting residue K from adhering to the upper cutting blade 21, and therefore prevent the cutting residue K from being mixed into the bag body W separated from the belt-like film F. The cutting residue K can be reliably recovered.

  The doctor device 30 includes a doctor blade 31 that contacts the surface of the upper cutting blade 21 and an expansion / contraction mechanism 32 that moves the doctor blade 31 forward and backward along the surface of the upper cutting blade 21. Since the doctor blade 31 peels off the cutting residue K attached to the surface of the upper cutting blade 21 during the forward movement, the cutting residue attached to the surface of the upper cutting blade 21 with a simple structure. K can be peeled off reliably.

  Further, when the strip film F is stopped, the upper cutting blade 21 moves from the retracted position to the cutting position, returns to the retracted position again, moves in the opposite direction to the transport direction of the strip film F, and again. Since it is configured to cut the strip-shaped film F twice by moving below the strip-shaped film F, a protrusion D is formed on the side edge of the bag W to be finally produced. In addition, it is possible to collect the cutting residue K generated when such a two-time cutting method is used.

  Moreover, the control apparatus 50 which controls a pair of cutting blades 21 and 22 and the doctor apparatus 30 is provided, and when the upper cutting blade 21 is stopped by the control of this control apparatus 50, the strip | belt-shaped film F has stopped. Move from the retracted position to the cutting position, return to the retracted position again, move in the opposite direction to the transport direction of the belt-shaped film F, and move again below the belt-shaped film F to cut the belt-shaped film F twice. The doctor device 30 is configured so that the extension mechanism 32 does not advance the doctor blade 31 after the first cutting by the upper cutting blade 21, and the extension mechanism 32 advances the doctor blade 31 after the second cutting. Yes. Accordingly, since the doctor blade 31 is advanced only when the cutting residue K is generated, the number of times of driving the doctor device 30 can be minimized, and energy saving and running cost can be reduced. Will be able to.

In addition, the bag making unit by this invention is not limited to said aspect, A various change can be added.
Next, a modification of the bag making unit according to the present invention will be described with reference to FIG. In FIG. 4, the same parts as those of the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 4, in the bag making unit 1a of the present modification, the upper cutting blade 21 is formed therein with an air ejection hole 21p extending through the upper cutting blade 21 in the vertical direction. The lower end portion of the air ejection hole 21p is located on the inclined surface 21b of the upper cutting blade 21 as shown in FIG. An air ejection mechanism 25 that sends air to the air ejection holes 21p is installed at the upper end of the upper cutting blade 21.
Further, in the bag making unit 1a of this modification, a control device 50a is provided instead of the control device 50 shown in FIG. 1, and this control device 50a includes a pair of cutting blades 21 and 22 and a doctor device 30. In addition, the air ejection mechanism 25 is also controlled.

  Next, operation | movement of the bag making unit 1a of this modification which consists of such a structure is demonstrated. The description of the same operation as that of the bag making unit 1 in FIGS. 1 to 3 is omitted.

  After the first cutting process on the strip-shaped film F by the upper cutting blade 21, the control device 50a controls the air ejection mechanism 25 so that the air ejection mechanism 25 causes air to enter the air ejection hole 21p of the upper cutting blade 21. The air is ejected from the air ejection hole 21p to the inclined surface 21b of the upper cutting blade 21. In this way, air is ejected downward from the inclined surface 21b. At this time, the doctor blade 31 moves forward, so that the direction of the air ejected downward is directed to the lower right in FIG. It will be changed. As a result, the air also hits the cutting residue K attached to the inclined surface 21b of the upper cutting blade 21, and the cutting residue K attached to the inclined surface 21b is peeled off by the spray force of the air, and naturally falls downward. Finally, the dust is collected by the dust collector 40.

  As described above, according to the bag making unit 1a of this modification, the air cutting hole 21p is formed in the upper cutting blade 21, and the air blowing mechanism 25 sends air to the air blowing hole 21p. Air is jetted out of the upper cutting blade 21 from the hole 21p. For this reason, when the doctor blade 31 moves forward, the direction of the air blown to the outside of the upper cutting blade 21 is changed by the doctor blade 31, and thus the cutting residue in which the air adheres to the inclined surface 21 b. It will hit K. In this way, not only the cutting blade K is directly peeled off by the doctor blade 31 but also the air sent from the air ejection mechanism 25 is applied to the cutting waste K to assist the peeling from the upper cutting blade 21. Then, the cutting residue K attached to the inclined surface 21b can be more reliably peeled off.

  As another modified example, when performing the two-time cutting method, the combination of the pair of cutting blades 21 and 22 is moved by a minute amount in the direction opposite to the transport direction of the belt-like film F after the first cutting process. Instead, the combination of the cutting blades 21 and 22 may be moved by a minute amount in the same direction as the transport direction of the belt-like film F.

It is a side view which shows the outline of a structure of the cutting blade vicinity in the bag making unit of one embodiment of this invention. It is a side view which shows the state after a doctor blade performed forward movement about the structure of the cutting blade vicinity in the bag making unit shown in FIG. It is a front view (figure which looked at the structure of FIG. 1 from the left) of the structure of the cutting blade vicinity in the bag making unit shown in FIG. It is a side view which shows the outline of a structure of the cutting blade vicinity in the bag making unit of other embodiment of this invention. It is a top view which shows the outline of the whole structure of a bag making unit. FIG. 6 is an enlarged view of a region M in FIG. 5, and shows a state when the vicinity of a portion previously punched and removed by a die set in a belt-like film is cut with a cutting blade. It is a figure which shows the bag body manufactured by cut | disconnecting only one time with a cutting blade with respect to a strip | belt-shaped film. It is a figure which shows the bag body manufactured by cut | disconnecting by cutting twice with a cutting blade with respect to a strip | belt-shaped film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Bag making unit 10 Film conveyance apparatus 21 Upper cutting blade 21a Vertical surface 21b Inclined surface 21c Front edge 21p Air ejection hole 22 Lower cutting blade 22a Vertical surface 22b Inclined surface 22c Front edge 24a, 24b Cutting location 25 Air ejection mechanism 30 Doctor device 31 Doctor blade 32 Telescopic mechanism 33 Base member 34 Holding member 40 Dust collector 50, 50a Control device 51 Stock sensor 60 Die set 60a Ceiling die set 60b Bottom corner die set

Claims (8)

A transport unit for transporting the belt-like film in the longitudinal direction;
A cutting blade for separating the bag body from the belt-shaped film transported by the transport section, the tip of which is freely movable between a retracted position above the belt-shaped film and a cutting position below the belt-shaped film. A cutting blade that separates the bag from the belt-like film by moving from the retracted position to the cutting position;
A doctor device installed on the cutting blade for peeling off the cutting residue that is generated when the cutting blade separates the bag from the belt-like film and adheres to the cutting blade;
A collection unit installed below the cutting blade for collecting the cutting residue;
A bag-making unit comprising: The doctor device has a doctor blade that contacts the surface of the cutting blade, and a telescopic mechanism that moves the doctor blade forward and backward along the surface of the cutting blade,
2. The bag making unit according to claim 1, wherein when the doctor blade moves forward, the doctor blade peels off the cutting residue adhering to the surface of the cutting blade. 3.   The bag making unit according to claim 2, wherein the doctor blade is made of a non-conductive member.   The said doctor blade is comprised so that it may extend in the direction orthogonal to the conveyance direction of the said strip | belt-shaped film, The bag making unit of Claim 2 or 3 characterized by the above-mentioned. The transport unit is configured to intermittently transport the belt-like film,
When the strip film is stopped, the cutting blade moves from the retracted position to the cutting position, returns to the retracted position, and moves in the forward or reverse direction with respect to the transport direction of the strip film. The bag-making unit according to any one of claims 1 to 4, wherein the bag-making unit is configured to cut the belt-like film twice by moving again below the belt-like film. A transport unit that intermittently transports the belt-like film in the longitudinal direction;
A cutting blade for separating the bag body from the belt-shaped film transported by the transport section, the tip of which is freely movable between a retracted position above the belt-shaped film and a cutting position below the belt-shaped film. A cutting blade that separates the bag from the belt-like film by moving from the retracted position to the cutting position;
A doctor device installed on the cutting blade for peeling off the cutting residue generated when the cutting blade separates the bag from the belt-like film and adheres to the cutting blade, and contacts the surface of the cutting blade And a telescopic mechanism for moving the doctor blade forward and backward along the surface of the cutting blade, and the doctor blade adheres to the surface of the cutting blade when the doctor blade moves forward. A doctor device for peeling off the cutting residue;
A collection unit installed below the cutting blade for collecting the cutting residue;
A control device for controlling the cutting blade and the doctor device;
With
Under the control of the control device, the cutting blade moves from the retracted position to the cutting position when the strip film is stopped, returns to the retracted position, and continues to the transport direction of the strip film. In the direction or in the opposite direction, and again to the lower side of the band-shaped film, the band-shaped film is cut twice. After the first cutting by the cutting blade, the expansion / contraction mechanism is moved to the doctor film. The bag making unit, wherein the blade is not advanced, and the telescopic mechanism advances the doctor blade after the second cutting.   The cutting blade has a vertical surface extending in a direction orthogonal to the transport direction of the belt-shaped film, and an inclined surface extending in an acute angle direction with respect to the vertical surface, and the doctor device is provided on the inclined surface of the cutting blade. The bag making unit according to any one of claims 1 to 6, wherein the attached cutting residue is peeled off. A transport unit that intermittently transports the belt-like film in the longitudinal direction;
A cutting blade for separating the bag body from the belt-shaped film transported by the transport section, the tip of which is freely movable between a retracted position above the belt-shaped film and a cutting position below the belt-shaped film. And cutting the bag body from the belt-like film by moving from the retracted position to the cutting position, and further a cutting blade having an air ejection hole,
A doctor device installed on the cutting blade for peeling off the cutting residue generated when the cutting blade separates the bag from the belt-like film and adheres to the cutting blade, and contacts the surface of the cutting blade And a telescopic mechanism for moving the doctor blade forward and backward along the surface of the cutting blade, and the doctor blade adheres to the surface of the cutting blade when the doctor blade moves forward. A doctor device for peeling off the cutting residue;
An air ejection mechanism for sending air to an air ejection hole formed in the cutting blade and ejecting air from the air ejection hole to the outside of the cutting blade;
A collection unit installed below the cutting blade for collecting the cutting residue;
A bag-making unit comprising:

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