JP2019093583A - Bag making machine - Google Patents

Abstract

To provide a bag making machine which can prevent occurrence of surface waviness at a glue adhesion part.SOLUTION: A bag making machine, which processes a planar sheet while transporting the same, thereby making a bottomed bag, comprises a glue coating part for coating a margin part of the sheet with a glue. The glue coating part comprises a transfer part, a glue supply part, and a rotary part. A glue is supplied onto a transfer surface of the transfer part by the glue supply part, and the transfer part is rotated by the rotary part, whereby the glue on the transfer surface is pressed onto the margin part at one time.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a bag making machine for producing an envelope.

  A bag making machine for producing envelopes includes a mechanism for applying glue to sheets. The application mechanism of such a glue is shown by patent documents 1-3, for example. In the mechanism of Patent Document 1, the projections on the circumferential surface of the application roller are immersed in a glue paste, and the projections to which the glue adheres are pressed against the sheet. In the mechanisms of Patent Documents 2 and 3, glue is discharged from a nozzle disposed above the sheet.

JP, 2012-187798, A Japanese Patent Application Laid-Open No. 9-58620 Utility model registration number 3055691 gazette

  In the mechanism of Patent Document 1, when the coating operation is not performed, in order to prevent drying of the glue, it is necessary to remove the glue crucible from the apparatus and store the glue tightly, which is troublesome for the operator.

  In the mechanisms of Patent Documents 2 and 3, since it takes time to start and finish the coating operation, the portion where the coating operation is started for the glue margin has a longer glue penetration time than the portion where the coating operation is finished. That is, a difference occurs in the permeation time of the glue in each part of the glue margin. Therefore, there have been cases where waving occurs in the glue margin part where glue is applied, that is, the glue adhesion part. This is particularly noticeable when the glue portion is long and when aqueous glue is used. The occurrence of corrugation in the glue-adhered part causes defects such as insufficient bonding of the sheet via the glue-adhered part and deterioration in appearance of the joint.

  An object of the present invention is to provide a bag making machine capable of preventing occurrence of waving at a glue adhering portion.

  A bag making machine according to the present invention is a bag making machine for processing a flat sheet while conveying it to produce a bottomed bag, comprising a glue application unit for applying a glue to a glue margin portion of the sheet, The glue application unit includes a transfer unit, a glue supply unit, and a rotation unit, the glue supply unit supplies glue to the transfer surface of the transfer unit, and the rotation unit rotates the transfer unit. Thus, the adhesive on the transfer surface is pressed against the adhesive margin portion at one time.

  According to the present invention, it is possible to apply the paste to the paste margin portion of the sheet at one time by the glue applying section, so that the permeation time of the paste becomes uniform in all of the paste margin sections, and therefore, the rippling occurs in the glue attachment section. You can prevent

It is the perspective view which looked at the bag making machine of one embodiment of the present invention from the upper stream side of conveyance direction. It is the perspective view which looked at the downstream side of conveyance direction, and the upper direction from the bag making machine of FIG. It is a top view of the bag making machine of FIG. It is IV-IV sectional drawing of FIG. It is a figure showing a flat sheet before processing. It is a figure which shows the sheet which passed through the first process. It is a figure which shows the sheet | seat which passed through the process following FIG. It is a figure which shows the sheet | seat which passed through the process following FIG. It is a figure which shows the sheet | seat which passed through the process following FIG. It is a figure which shows the sheet | seat which passed through the process following FIG. FIG. 11 is a sheet subjected to processing following FIG. 10 and is a view showing a Japanese-style envelope which is a final product. It is a cross-sectional schematic diagram which shows a sheet | seat changing with processing in a bag making machine. It is an expanded sectional view of the 1st fold part. It is an expanded sectional view of a paste application part and a 2nd fold part, and shows the state before operation. It is an expanded sectional view which shows the action | operation following FIG. 14 of a glue application part. It is an expanded sectional view which shows the action | operation following FIG. 15 of a glue application part. It is the upper perspective view which looked at the glue application part from the conveyance direction downstream side. It is the upper perspective view which looked at one side in the cross direction of the main part of a paste application part from the conveyance direction lower stream side. It is the top perspective view which looked at the other side in the cross direction of the main part of a paste application part from the conveyance direction lower stream side. It is a top view of a glue application part. It is the downward perspective view which looked at the main-body part of the glue application part from the conveyance direction upstream. It is the upper perspective view which looked at the glue application part in which the application | coating nozzle is in a supply position from the conveyance direction downstream side. It is the upper perspective view which looked at the glue application part in which the application | coating nozzle is in the retracted position from the conveyance direction downstream side. It is the upper perspective view which looked at the 3rd folding part from the conveyance direction upper stream side. It is the upper perspective view which looked at the 3rd folding part from the conveyance direction lower stream side. It is the upper perspective view which looked at the operation state of the 3rd folding part from the conveyance direction upper stream side. FIG. 7 is a schematic view showing a conventional operation in which the sheet conveyance surface is inclined obliquely downward with respect to the conveyance surface of the press roller pair. FIG. 28 is a schematic cross-sectional view of the envelope having “box breakage” obtained by the operation of FIG. 27.

  1 to 4 show a bag making machine 10 according to an embodiment of the present invention. The bag making machine 10 is adapted to produce a Japanese-style envelope while conveying a flat sheet. FIG. 1 is a perspective view of the bag making machine 10 as viewed from the upstream side and the upper side in the transport direction. FIG. 2 is a perspective view of the bag making machine 10 as viewed from the downstream side and the upper side in the transport direction. FIG. 3 is a plan view of the bag making machine 10. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. The bag making machine 10 includes a paper feeding unit 1, a first folding unit 2, a glue applying unit 3, a second folding unit 4, a direct glue applying unit 5, a crease processing unit 6, and a third folding unit in order from the upstream side in the transport direction. 7 and the paper discharge unit 8 are provided in the apparatus main body 10A. The “transport direction” is the arrow X direction. The “width direction” is a direction W orthogonal to the transport direction X. Also, when looking from the upstream side to the downstream side, the right side in the width direction W is referred to as "right side" (or simply "right"), and the left side in the width direction W is "left side" (or simply "left") It is called.

  The bag-making machine 10 manufactures a Japanese-style envelope 90 by processing the flat sheet 100 shown in FIG. 5 as shown in FIGS. 6 to 11 while conveying it in the conveyance direction X. It is supposed to be. The seat 100 includes a front surface portion 101, a central surface portion 102, a rear surface portion 103, and an entrance piece portion 104 and a bottom piece portion 105 protruding to both sides of the central surface portion 102.

  In the bag making machine 10, the sheet 100 is first folded by the first folding unit 2 at the first fold line 111, which is a boundary between the rear surface portion 103 and the central surface portion 102, as shown in FIG. Next, as shown in FIG. 7, the glue application unit 3 applies glue to the edge (i.e., glue margin) on the downstream side in the conveyance direction of the surface of the folded back surface 103 as shown in FIG. The portion 112 is formed, and then the second fold portion 4 folds it as shown in FIG. 8 at a second fold line 113 which is a boundary line between the front surface portion 101 and the central surface portion 102. The edge on the upstream side in the transport direction of the back surface of the folded front surface portion 101 is joined to the rear surface portion 103 by the glue adhesion portion 112, and then, by the glue direct application portion 5, as shown in FIG. The edge of the surface of the bottom piece 105 (ie The glue is applied to the glue portion to form a glue adhesion portion 114. Next, as shown in FIG. 10, the crease processing portion 6 forms a third boundary line between the central surface portion 102 and the bottom piece portion 105. A crease is formed along the fold 115, and then the third fold 7 folds the third fold 115 as shown in FIG. 11, whereby the folded back portion 105 is folded back. It is joined to the surface of the back surface part 103 and the front surface part 101 which are being carried out by the glue adhesion part 114. FIG. Thus, a Japanese-style envelope 90 shown in FIG. 11 is obtained. FIG. 12 is a schematic cross-sectional view showing how the sheet 100 changes in the bag making machine 10 due to processing.

[Paper Feeder 1]
As illustrated in FIGS. 1 to 3, the sheet feeding unit 1 includes a sheet feeding tray 11 that is inclined and a conveyance roller 12. The transport roller 12 feeds the sheets 100 placed on the paper feed tray 11 downstream in the transport direction one by one. In the sheet feeding unit 1, the sheet 100 exists in the state A of FIG. 12.

[First folding unit 2]
As shown in FIG. 13 which is an enlarged view, the first folding unit 2 includes a conveying roller pair 21, a press roller pair 22, and a switchback guide plate 23.

  The conveying roller pair 21 includes an upper roller 211 and a lower roller 212, and is located upstream of the switchback guide plate 23 in the conveying direction, and is fed from the sheet feeding unit 1 through the conveying surface 201. The sheet 100 is fed into the switchback guide plate 23.

  The switchback guide plate 23 is inclined obliquely upward with respect to the transport surface 201 and downstream in the transport direction. The guide plate 23 is configured by overlapping two plates 231 and 232 with a gap 233 therebetween. The gap 233 has an interval at which one sheet 100 is inserted. Further, the guide plate 23 is provided with a stopper 234 with which the front end of the front surface portion 101 of the sheet 100 inserted into the gap 233 abuts. The stopper 234 is provided so as to be fixed at an arbitrary position within a predetermined distance in a direction parallel to the transport direction X along the long hole 2311 (FIG. 1) of the upper plate 231.

  The press roller pair 22 includes an upstream roller 221 and a downstream roller 222. The lower roller 212 of the conveying roller pair 21 and the upstream roller 221 of the press roller pair 22 are used in common. The press roller pair 22 is disposed such that the nip portion 220 is located below the inlet of the guide plate 23. The distance from the nip portion 220 to the stopper 234 is set to be the same as the conveyance direction length X1 (FIG. 5) of the front surface portion 101 and the central surface portion 102 of the sheet 100.

  In the first folding unit 2, the sheet 100 fed to the guide plate 23 by the pair of conveying rollers 21 is further conveyed after coming into contact with the stopper 234, so that as shown in the state B of FIG. It enters the nip portion 220 while being folded back at the first fold 111 and passes through the press roller pair 22. As a result, the sheet 100 is in the state of FIG. 6 in which the rear surface portion 103 is folded back.

[Seal application unit 3]
14-16 is sectional drawing which shows the action | operation of the glue application part 3. FIG. The glue application unit 3 includes a transfer unit 31, a glue supply unit 32, and a rotation unit 33, and operates on the sheet 100 on the horizontal conveyance surface 34. The glue application unit 3 supplies glue to the transfer surface 311 of the transfer unit 31 by the glue supply unit 32, as shown in FIG. 14, and rotates the transfer unit 31 by the rotation unit 33, as shown in FIG. By moving, as shown in FIG. 16, the paste on the transfer surface 311 is pressed on the transport surface 34 at one time to the paste margin portion of the sheet 100. FIG. 17 is a top perspective view of the glue application unit 3 as viewed from the downstream side in the transport direction. In FIG. 17, the glue application unit 3 is in a standby state.

(1) The transfer portion 31 is a plate-like member made of silicone rubber, and has a transfer surface 311 on the surface. The transfer portion 31 extends in the width direction W.

(2) The pivoting portion 33 has two arms 331 supporting the transfer portion 31 and a pivoting shaft 332 extending in the width direction W and rotatably supporting the arm 331, and a pivoting shaft 332 And a pulley 334, an annular belt 335, and a pulley 336 for transmitting the drive of the motor 333 to the rotation shaft 332. The two arms 331 are provided to be separated from and opposed to each other in the width direction W. In the pivoting portion 33, when the motor 333 is driven, the pivoting shaft 332 is pivoted and the arm 331 is pivoted 180 degrees in the R1 direction (FIG. 14).

(3) The glue supply unit 32 supports the application nozzle 321 for discharging glue on the transfer surface 311, the glue tank 322 and tube 323 (FIG. 1) for supplying glue to the application nozzle 321, and the main body for supporting the application nozzle 321. And a width moving mechanism 325 for moving the main body 324 in the width direction. FIG. 18 is a top perspective view of one side in the width direction W of the main body portion 324 viewed from the downstream side in the transport direction, and FIG. 19 is a view of the other side in the width direction W of the body portion 324 viewed from the downstream side in the transport direction It is a top perspective view.

(3-1) The body portion 324 supports the slider portion 3241 slidably attached to the slide shaft 3251 extending in the width direction, the fixing portion 3242 fixed on the slider portion 3241, and the application nozzle 321. The movable portion 3243 is attached to the fixed portion 3242 so as to be vertically movable, and a vertical movement mechanism 3244 for moving the movable portion 3243 vertically.

(3-1-1) The vertical movement mechanism 3244 includes a motor 3261 held by the fixed portion 3242, a gear 3262 for transmitting the drive of the motor 3261 to the movable portion 3243, and a sensor 3263 for detecting the uppermost position of the movable portion 3243. And have. The movable portion 3243 has a horizontal portion 3264 directly supporting the application nozzle 321, and a vertical portion 3266 having a rack 3265 meshing with the gear 3262. The horizontal portion 3264 abuts on the substrate portion 3267 of the fixed portion 3242 from above when the movable portion 3243 is at the lowermost position. In the vertical movement mechanism 3244, when the motor 3261 is driven, the movable portion 3243 moves up and down via the gear 3262. The uppermost position of the movable portion 3243 is a standby position of the application nozzle 321. The lowermost position of the movable portion 3243 is an application position where the application nozzle 321 abuts on the transfer surface 311.

(3-2) FIG. 20 is a plan view of the glue application unit 3 of FIG. FIG. 21 is a lower perspective view of the main body 324 as viewed from the upstream side in the transport direction. The width moving mechanism 325 is a ring belt 3254 wound around a slide shaft 3251, a motor 3252, and a drive pulley 3253 of the motor 3252 and extending in the width direction W, downward from the fixing portion 3242 of the main body 324. And a connecting portion 3255 which is extended and fixed to the annular belt 3254. The motor 3252 is disposed on a substrate 3271 provided parallel to the slide shaft 3251, the annular belt 3254 is disposed below the substrate 3271, and the substrate 3271 has a connecting portion. A slot 3272 is formed for the 3255 to move in the width direction. In the width moving mechanism 325, when the motor 3252 is driven, the annular belt 3254 moves in the width direction W, and along with that, the main body portion 324 moves in the width direction W.

(4) The conveyance surface 34 extends horizontally and is provided with the stopper 341 with which the conveyed sheet 100 abuts. The position of the stopper 341 is such that, when the sheet 100 abuts against the stopper 341 as shown in state C of FIG. 12, the adhesive margin portion of the rear surface portion 103 is on the transfer surface 311 of the transfer portion 31 rotated for application. It is set to the position directly below.

The glue application unit 3 operates as follows.
First, before turning on the power supply (not shown) of the bag making machine 10, the glue application unit 3 is in the standby state shown in FIG. That is, the main body 324 is in the standby position. When the power is turned on and conveyance of the sheet 100 is started, the width moving mechanism 325 operates to move the main body 324 from the standby position to the supply position shown in FIG. At the supply position, the main body 324 is located slightly above the right end of the transfer unit 31 in the width direction. Next, the width movement mechanism 325 and the vertical movement mechanism 3244 operate at the same time, and the coating nozzle 321 contacts the transfer surface 311 while moving in the width direction W along the transfer surface 311 and supplies glue to the transfer surface 311 Do. When the coating nozzle 321 moves along the transfer surface 311, the vertical movement mechanism 3244 repeats the vertical movement. Then, when the movement along the transfer surface 311 is completed, the width movement mechanism 325 and the vertical movement mechanism 3244 are further operated, and the main body portion 324 is moved from the rotation locus of the transfer portion 31 as shown in FIG. It moves to the left in the width direction so as to disengage, and the application nozzle 321 moves upward to the same height as the supply position. That is, the application nozzle 321 is at the retracted position shown in FIG. Next, the rotation unit 33 operates to rotate the transfer unit 31 by 180 degrees. Thereby, the glue supplied to the transfer surface 311 is applied to the glue margin portion of the sheet 100 at one time. State C in FIG. 12 shows the state of the sheet 100 when the glue is applied. Next, the rotation unit 33 operates to rotate the transfer unit 31 so as to return to the original state. Then, the width moving mechanism 325 operates to move the main body 324 in the width direction W, whereby the application nozzle 321 moves from the retracted position to the supply position.

[Second folding unit 4]
As shown in FIGS. 14 to 16, the second folding unit 4 carries a pair of transport rollers 41 for feeding the sheet 100 conveyed from the first folding unit 2 to the glue applying unit 3, and an application operation in the glue applying unit 3. And a press roller pair 42 for conveying to the next stage while folding the sheet 100 having been completed. The conveying roller pair 41 includes an upstream roller 411 and a downstream roller 412. The press roller pair 42 includes an upper roller 421 and a lower roller 422. The downstream roller 412 of the transport roller pair 41 and the upper roller 421 of the press roller pair 42 are used in common.

  The nip portion 420 of the press roller pair 42 is located on the same horizontal plane as the conveyance surface 34 of the glue application unit 3. That is, the glue application unit 3 and the second folding unit 4 operate on the sheet 100 on the transport surface that constitutes the same horizontal surface. Furthermore, the downstream end 3421 of the guide plate 342 constituting the transport surface 34 in the transport direction is separated from the nip portion 420 by a distance L1 (FIG. 14). When the sheet 100 conveyed by the conveyance roller pair 41 is further conveyed in a state of being in contact with the stopper 341 of the glue application unit 3, the distance L1 is a sheet as shown in a state C of FIG. The distance is set such that the rear vicinity portion 120 of the second fold line 113 of 100 comes into contact with the lower roller 422.

  Furthermore, between the glue application unit 3 and the second folding unit 4, a transport roller in contact with the glue adhesion unit 112 is not disposed.

  In the second folding unit 4, the sheet 100 transported to the glue application unit 3 by the transport roller pair 41 is further transported after coming into contact with the stopper 341, as shown in state C of FIG. 12, The sheet enters the nip portion 420 while being folded back at the second fold 113 and passes through the press roller pair 42. As a result, the sheet 100 is in the state of FIG. 8 in which the front surface portion 101 is folded back and joined to the rear surface portion 103.

[Adhesive direct application unit 5]
As shown in FIG. 4, the glue direct coating unit 5 includes a coating nozzle 51 that moves up and down, and a glue tank 322 and a tube 53 that supply glue to the coating nozzle 51. When the glue margin portion of the bottom piece portion 105 of the sheet 100 being conveyed comes directly below the coating nozzle 51, the glue direct coating unit 5 lowers the coating nozzle 51 to abut on the glue margin portion, thereby making the glue The glue is applied to the substitute part, and when the glue part passes directly below the application nozzle 51, the application nozzle 51 is raised and made to stand by. According to the glue direct application unit 5, as shown in FIG. 9, the glue is applied to the edge (that is, the glue margin) of the surface of the bottom piece portion 105 to form the glue adhering unit 114.

[Crease processing part 6]
The crease processing unit 6 is configured to form a crease in the third fold 115 of the sheet 100. A known mechanism can be adopted as the crease processing unit 6.

[Third folding unit 7]
The third fold 7 is disposed on the right side in the width direction so that the bottom piece 105 is folded back at the third fold 115. FIG. 24 is a top perspective view of the third folding unit 7 as viewed from the upstream side in the transport direction. FIG. 25 is a top perspective view of the third folding unit 7 as viewed from the downstream side in the transport direction. The third folding portion 7 is provided with a flap plate 71 rotatably provided for folding back the bottom piece portion 105, a link mechanism 72 for pivoting the flap plate 71, and a motor 73 for driving the link mechanism 72. The pulleys 74 and 75, an annular belt 76, and a sensor 77 for detecting the state of the link mechanism 72 are provided.

  The link mechanism 72 is composed of a longitudinal arm body 721 and a transverse arm body 722. In the link mechanism 72, when receiving the drive from the motor 73, the vertical arm body 721 rotates from the horizontal state in the R2 direction shown in FIG. 24, and accordingly, the horizontal arm body 722 moves to the left in the width direction It has become. The sensor 77 detects that the vertical arm body 721 is in the horizontal state before turning.

  The flap plate 71 is pivoted in the R3 direction with the bottom portion 105 as shown in FIG. 26 by the lateral arm body 722 of the link mechanism 72 moving to the left in the width direction.

  The third folding portion 7 is configured to fold back the bottom piece portion 105 at a third fold 115 by rotating the flap plate 71.

[Paper output unit 8]
The sheet discharge unit 8 includes two conveyance roller pairs 81 and 82 and a sheet discharge tray 83. The transport roller pair 82 is provided to operate as a discharge roller. The sheet discharge tray 83 is inclined obliquely upward and downward in the conveyance direction from a position below the conveyance surface 80 which is the same horizontal surface as the conveyance surface 34.

  Next, the operation of the bag making machine 10 configured as described above will be described.

  First, the sheet 100 shown in FIG. 5 is placed on the paper feed tray 11. At this time, the front surface portion 101 is located downstream in the transport direction. Then, the power supply (not shown) is turned on to start the operation.

(1) The sheet 100 on the sheet feeding tray 11 is fed downstream by the conveyance roller 12 in the conveyance direction, and enters the first folding unit 2.

(2) The sheet 100 having entered the first folding unit 2 enters the nip portion 220 while being folded back at the first fold line 111 and passes through the press roller pair 22. As a result, the rear surface portion 103 is folded back, and the sheet 100 in the state of FIG. 6 is obtained.

(3) The sheet 100 in the state of FIG. 6 is conveyed by the conveyance roller pair 41 and enters the glue application unit 3. On the other hand, before the sheet 100 is sent to the glue application unit 3, the glue supply unit 32 operates to supply the glue to the transfer surface 311 of the transfer unit 31. Then, the sheet 100 entering the glue application unit 3 abuts against the stopper 341 and is temporarily stopped. At this time, the rotation unit 33 operates to rotate the transfer unit 31 by 180 degrees. As a result, the glue on the transfer surface 311 is applied to the glue margin portion of the sheet 100 at one time, and the sheet 100 in the state of FIG. 7 is obtained.

(4) The sheet 100 in the state of FIG. 7 is already located in the second folding unit 4 and is further transported by the transport roller pair 41 and enters the nip 420 while being folded back at the second fold 113. Then, pass the press roller pair 42. At this time, the glue adhesion unit 112 does not contact the transport roller. As a result, the front surface portion 101 is folded back and joined to the rear surface portion 103 at the same time, and the sheet 100 in the state of FIG. 8 is obtained.

(5) The sheet 100 in the state of FIG. 8 is further conveyed by the conveyance roller pair 45 (FIG. 4) and passes through the glue direct application unit 5. In the adhesive direct application unit 5, when the passage of the adhesive margin portion of the bottom piece portion 105 starts, the application nozzle 51 moves downward and abuts on the surface of the adhesive margin portion and the passage of the adhesive margin portion ends The application nozzle 51 moves upward and leaves the surface of the glue margin portion. As a result, the glue is applied to the glue margin portion of the bottom piece portion 105 to form the glue adhering portion 114, and the sheet 100 in the state of FIG. 9 is obtained.

(6) The sheet 100 in the state of FIG. 9 is further conveyed and passes through the crease processing unit 6. In the crease processing unit 6, creases are formed at the third fold line 115 of the sheet 100. Thereby, the sheet 100 in the state of FIG. 10 is obtained.

(7) The sheet 100 in the state of FIG. 10 is further conveyed and stopped at the third folding unit 7. At this time, the flap plate 71 of the third folded portion 7 is horizontally positioned outward in the width direction, and the bottom piece portion 105 of the sheet 100 is placed on the flap plate 71. Then, the motor 73 is operated, the link mechanism 72 is operated, and the flap plate 71 is pivoted inward (in the R3 direction). As a result, the bottom piece portion 105 is folded inward at the third fold 115 and is joined to the surfaces of the front surface portion 101 and the rear surface portion 103. Thus, the sheet 100 in the state of FIG. 11 is obtained. The flap plate 71 turns outward after the bottom piece portion 105 is folded.

(8) The sheet 100 in the state of FIG. 11 is further conveyed by the conveyance roller pairs 81 and 82 and discharged onto the paper discharge tray 83. Thus, the Japanese-style envelope 90 shown in FIG. 11 is obtained.

  According to the bag making machine 10 of the said structure, the following effects can be exhibited.

(A) Since the paste can be applied to the paste margin portion of the rear surface portion 103 at one time by the paste application unit 3, the permeation time of the paste becomes uniform in all of the paste margin portions. Therefore, the occurrence of corrugation on the sheet 100 can be prevented.

(B) The glue is stored in the glue tank 322, and is supplied to the coating nozzles 321 and 51 as required. Therefore, no work is necessary to prevent the glue from drying. Therefore, the maintenance work of the operator can be simplified. The operator can prevent drying of the glue at the tip of the nozzle only by covering the tip of the application nozzles 321 and 51 with a cap.

(C) In the glue coating unit 3, the glue supply to the transfer surface 311 is performed by the coating nozzle 321, which can be easily performed.

(D) In the glue coating unit 3, the coating nozzle 321 supplies the glue to the transfer surface 311 while repeating the vertical movement, so the amount of glue loading on the transfer surface 311 can be increased.

(E) In the glue coating unit 3, the coating nozzle 321 can be displaced between the supply position and the retracted position, so the overall configuration of the glue coating unit 3 can be simplified.

(F) Since the conveyance roller in contact with the glue adhering unit 112 is not disposed between the glue applying unit 3 and the second folding unit 4, when transferring from the glue applying unit 3 to the second folding unit 4 The glue of the sheet 100 does not adhere to the transport roller. Therefore, the transport roller is not contaminated with glue.

(G) In the glue application part 3, since the transfer part 31 is made of silicone rubber, even if the glue is dry, the operator can easily peel off and remove the glue. Therefore, the maintenance work of the operator can be simplified.

(H) The glue application unit 3 and the second folding unit 4 operate on the sheet 100 on the transport surface constituting the same horizontal surface, so that so-called "box breakage" can be prevented. Incidentally, in the sheet 100 in which the rear surface portion 103 has already been folded back, when the front surface portion 101 is folded back, the transport surface F1 of the sheet 100 is against the transport surface F2 of the press roller pair 42 as shown in FIG. When the rear surface portion 103 enters the nip portion 420, the portion of the first fold 111 is deformed into a box shape as shown in FIG. It will This is called "box breaking". However, in the present embodiment, the conveyance surface F1 (that is, the conveyance surface 34) of the sheet 100 constitutes the same horizontal surface with respect to the conveyance surface F2 of the press roller pair 42, so "box breakage" can be prevented.

(I) In the second folding unit 4, the distance between the downstream end 3421 of the guide plate 342 in the transport direction and the nip portion 420 of the transport surface 34 is set to the distance L1, so the second fold 113 of the sheet 100 is the nip When the sheet is fed to the portion 420, as shown in a state C of FIG. 12, the rear vicinity portion 120 of the second fold 113 of the sheet 100 comes into contact with the lower roller 422. Therefore, the conveying force when the sheet 100 is fed to the press roller pair 42 is increased. Therefore, the folding process in the second folding unit 4 can be smoothly performed.

(J) Since the crease is formed on the third fold line 115 by the crease processing unit 6, the folding by the third folding unit 7 can be smoothly performed.

(K) Since the bottom piece portion 105 is folded back by the rotation of the flap plate 71 of the third folding portion 7, the bottom piece portion 105 can be folded back in a short period of time reliably and uniformly.

  The bag making machine 10 of the present invention may optionally adopt one or more of the following modified configurations.

(1) The glue application unit 3 is set to apply the glue to the shorter glue margin part of the glue margin part of the sheet 100.
(2) The crease processing unit 6 is not provided.

(3) The third folding portion 7 has a structure other than the structure for rotating the flap plate 71.

(4) In the above embodiment, the coating nozzle 321 supplies glue to the transfer surface 311 while moving from the supply position to the retraction position, and does not supply glue to the transfer surface 311 when moving from the retraction position to the supply position However, in the present invention, the coating nozzle 321 may supply the glue to the transfer surface 311 even when moving from the retracted position to the supply position.

  In addition, the Japanese-style envelope which can manufacture the bag making machine of this invention can be formed not only by the Japanese-style envelope of a general form but by folding back side part 103 and front side part 101, and making bottom piece part 105 adhere. In the case of an envelope, such an envelope is included.

  Since the bag making machine of the present invention can prevent the occurrence of corrugation in the glue-adhered portion, it has great industrial utility value.

DESCRIPTION OF SYMBOLS 2 1st folding part 3 paste application part 31 transfer part 311 transfer surface 32 paste supply part 321 application nozzle 33 rotation part 4 2nd folding part 5 paste direct application part 6 crease processing part 7 third folding part 71 flap plate 10 Bag machine 90 Japanese-style envelope (sealed bag) 100 sheet 101 front surface 102 center surface 103 rear surface 104 entrance piece 105 bottom piece 112, 114 glue adhesion part

Claims (7)

In a bag making machine for processing a flat sheet while conveying it to produce a bottomed bag,
It has a glue application unit that applies glue to the glue margin part of the sheet,
The glue application unit includes a transfer unit, a glue supply unit, and a rotation unit, the glue supply unit supplies glue to the transfer surface of the transfer unit, and the rotation unit rotates the transfer unit. The paste on the transfer surface is pressed against the paste margin at one time by
A bag making machine characterized by The glue supply unit includes a coating nozzle,
The application nozzle supplies glue to the transfer surface while moving along the transfer surface.
The bag making machine according to claim 1. The coating nozzle is configured to repeat vertical movement when moving along the transfer surface.
The bag making machine according to claim 2. The application nozzle is configured to be displaced between a supply position for supplying glue to the transfer portion and a retracted position deviated from a rotation track of the transfer portion.
The bag making machine according to claim 2 or 3. The transfer unit is a plate-like member made of silicone rubber.
The bag making machine according to any one of claims 1 to 4. The sheet is composed of a front surface, a central surface, a rear surface, and an inlet and a bottom extending to both sides of the central surface.
Furthermore, a first folding unit is provided on the upstream side in the sheet conveying direction with respect to the glue coating unit, and a second folding unit and a glue direct coating are provided on the downstream side in the conveying direction with respect to the glue coating unit. Part, a creased part, and a third fold part,
The first folding portion is configured to fold the rear surface portion so as to overlap the central surface portion.
The glue application unit is configured to apply a glue to a glue margin portion along the edge on the front surface portion side of the folded rear surface portion to form a glue adhesion portion.
The second folding portion folds the front surface portion so as to overlap the center surface portion and the glue adhesion portion of the rear surface portion, and presses an edge of the front surface portion to the glue adhesion portion Is supposed to
The glue direct application unit is configured to apply a glue to a glue margin part of the bottom piece to form a glue adhering part,
The creased portion is adapted to form a crease along the boundary between the bottom piece and the central surface,
The third folding portion has a flap plate that rotates about an axis extending along the transport direction, and the flap plate is brought into contact with the bottom piece portion from below and is rotated, The bottom piece portion is folded back with the crease as a crease and pressed against the front surface portion and the rear surface portion.
The bag making machine according to any one of claims 1 to 5. The glue application unit and the second folding unit are configured to operate on the sheet on a conveyance surface that constitutes the same horizontal surface.
The bag making machine according to claim 6.

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