JP2006224515A - Machine for forming square-bottomed bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag forming machine for thin paper which prevents the occurrence of wrinkles. <P>SOLUTION: The machine for forming a square-bottomed bag comprises a paper cylinder feeder for feeding a paper cylinder having gore parts which are folded, stuck, and infolded in an M-shape in its both side parts, a folding streak forming device for forming a folding streak for forming a square bottom in one end part in the conveyance direction of the paper cylinder, the first bottom opening device which opens one end of the paper cylinder in the surface back direction along the folding streak while the paper cylinder is moved along a rotating bottom folding drum, the second bottom opening device which pushes/opens a part opened vertically in the shape of flaps on the surface side and the back side along the folding streak, a press which presses each flap opened in a flap-shape in the shape of a plane, an applicator for applying paste to prescribed parts of the opened flaps, a folding device for folding flap pieces on the tip sides of the flaps on the surface side and the back side, and a folding device for folding/piling both flap pieces inside. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag making machine for square bottom bags for continuously forming square bottom paper bags such as confectionery bags and medicine bags.

  This type of bag making machine is known from Patent Literature 1 and Patent Literature 2, and the bag making machine disclosed in Patent Literature 1, for example, is as follows.

  In other words, a paper cylinder forming a paper cylinder for folding a paper bag for a paper bag and folding the two together and forming both sides of the bag into an M shape and forming M-shaped gussets on both sides. And a bag bottom forming device for forming a square bottom portion of the paper tube formed by the paper tube forming device.

  The bag bottom forming device includes a supply device that continuously feeds the formed paper tube at intervals, and a bottom fold that is disposed on the terminal end side of the supply device and closes to the bottom of the bag that forms the corner bottom portion of the paper bag. When the line and the bottom folding line are engraved in a streak shape, the bottom folding drum that rotates and transports the paper cylinder by rotation, and the bottom folding drum is arranged close to the outer periphery of the bottom folding drum, A bottom opening device that adsorbs and opens the bottom of the bag, and is provided in the vicinity of the outer periphery of the bottom folding drum, and the front side folding flaps are turned upside down from the bottom folding line formed by the folding device, and each folding flap on the front and back sides Flap folding device that unfolds the sheet along the bottom folding drum, a press roller that presses the unfolded paper tube, a gluing device that glues each folding flap on the front side, and each folding flap on the front and back sides Flat A startup device is provided with a bag bottom folding apparatus of attaching the respective folding flap.

  On the outer periphery of the bottom folding drum, there are a supplementary claw that supplements the tip of the back side folding flap of the paper tube, a front clamping claw that bites the front and back positions of the bottom folding line of the back side folding flap, and an opening and closing claw arranged on the bottom opening device The opening / closing claw that clamps the paper tube from the folding part, the rear presser claw and the rear raising claw located near the bottom folding line of the front folding flap, and the suction port for sucking the back folding flap are arranged. Has been.

  The supplementary claw is located in the center portion of the bottom folding drum in the axial direction, and a tip portion thereof extends from the inside to the outer periphery of the bottom folding drum, and the back side is formed by the tip portion of the supplementary claw and the bottom folding drum. The folding flap is sandwiched. On the other hand, the front clamping claw is composed of a fixed claw fixed inside the bottom folding drum and a movable claw provided inside the bottom folding drum so as to face the fixed claw. The front and back of the bottom folding line is sandwiched.

  Further, on both sides of the bottom folding drum, a front presser claw for pressing the front side of the bottom folding line of the front folding flap from the upper side of the front folding flap, and a front folding flap at the rear side of the bottom folding line of the front folding flap And a rear raising claw located between the paper and the surface paper of the paper tube.

  The rear presser claw and the rear raised claw are arranged in pairs in the width direction of the bottom folding drum, and are attached to a mounting bracket integrated with the rear presser claw and the rear raised claw, respectively. A movable shaft fixed to the bottom folding drum and slidably guided by supporting brackets that rotate integrally with the bottom folding drum and rotatably supporting the mounting bracket, and a rear presser claw on the bottom folding drum side A push-up lever for rotating the rear claw or a push-down lever for rotating the rear raising claw toward the bottom folding drum is provided.

  Each movable shaft has a cam abutting portion at the outer tip, and this cam abutting portion abuts on each cam surface fixed to the main body frame and located on the side of the bottom folding drum. By doing so, the rear presser claw and the rear raising claw can perform a reciprocating operation in the axial direction of the bottom folding drum.

  A protruding cam contact portion is disposed at the tip of the push-up lever or push-down lever.

  Furthermore, the first left and right cams and the second left and right cams that are in contact with the cam contact portions of the respective movable shafts are located on both outer sides of the bottom folding drum on the main body frame corresponding to the respective movable shafts. The first upper and lower cams that are fixed in the radial direction from the axis of the bottom folding drum of the first and second left and right cams and that are in contact with the cam contact portion at the end of the push-up lever or push-down lever, respectively The second upper and lower cams are fixed integrally with the first and second left and right cams.

  In addition, the movable shaft is pressed against the first and second left and right cams by a spring disposed in a recess formed on the other end side, and the spring is bridged between each mounting bracket and the support bracket. The push-down lever or push-up lever is configured to be pressed against the first and second vertical cams.

  The first up / down and left / right cams have a shape that presses the surface paper of the paper tube when the rear raising claw opens the bottom of the paper tube by the bottom opening device, and the second up / down and left / right cams are The rear presser claw is shaped to hold the paper tube pressed by the press roller.

  As the flap raising device, a rotary shaft provided with two flat pushing blades is provided on the front side of the bottom folding drum, and the rotation of the rotary shaft causes the paper cylinder to be conveyed by the bottom folding drum. The above folding blades are pressed along the bottom folding lines of the front and back folding flaps, and are guided between the front clamping claws that hold the vicinity of the bottom folding line and between the rear presser claw and the rear raising claw. It is like that.

  At this time, press the front side of the bottom folding line in the front folding flap from the both sides in the width direction with the rear presser claw, and raise the rear side of the bottom folding line from both sides in the width direction by raising it with the claws. Each folds inward from the bottom fold line.

  The paper tube in which the front and back folding flaps are folded first folds the front folding flap inward by bringing the bottom folding rod into contact with the front folding flap by the rotation of the chain, and then the back side by the bottom folding plate. The folding flap is folded inward, and the back folding flap is folded between the bottom folding drum and the bottom folding plate so that the back folding flap is folded on the front folding flap.

  After that, the paper tube is sandwiched between two endless belts that are laid over a plurality of guide rollers so that the folded flaps on the front and back sides are overlapped, and the paper tube is moved to the next step by the rotary conveyance drum and the endless belt. To the supply position of the press device, press the folded flaps on the front and back folded by the press roller to form the square bottom of the paper bag, and finally count the formed paper bag by the count unit, Paper bags are arranged on the table.

JP-A-11-091003 Japanese Patent Laid-Open No. 7-164579

  In the case of a square bottom bag making machine having the conventional bag bottom forming apparatus described above, when printing is performed on a bag surface using a general printing paper, Since the paper is thinner than the paper for bag making, wrinkles are likely to occur at the time of bag making, and the forming accuracy of the square bottom is deteriorated. In addition, because the paper is thin, the paper fluctuates easily and is unstable, which causes problems such as inability to carry it normally, making bag making difficult. Even if bag making is possible, the production speed is slow and productivity is low. Deteriorate. Furthermore, irregularities are likely to occur on the produced bag surface, and this irregularities have the disadvantage that even if printing is attempted with a printer or the like, it may not be applied to the printer.

  The present invention has been made in view of the above, and an object of the present invention is to provide a bag making machine for a square-bottom bag capable of making a bag without causing wrinkles even with a relatively thin sheet for general printing. To do.

  In order to achieve the above object, a square bottom bag making machine according to the present invention comprises a paper tube which is folded in two and bonded together, and is provided with a gusset portion which is folded inward in an M shape on both sides thereof. A paper tube supply device for supplying the paper tube, a folding device for forming a folding line for forming a bottom at one end of the paper tube in the conveyance direction, and the folding while the paper tube moves along the bottom folding drum. A first bottom opening device that opens one end of the paper tube along the line in the front and back direction of the paper tube, and a second opening device that pushes the portion opened in the vertical direction into the front and back flaps along the folding line. A bottom opening device, a pressing device that presses each flap opened in a flap shape to make it flat, a gluing device that applies glue to a predetermined portion of the opened flap, and a front end of each flap on the front side and the back side Folding device that folds the flap piece on the side and both flap pieces folded inward A sleeping folding device, has a paper cylinder flap pieces is folded from a transport device for conveying and discharging.

  According to the first aspect of the present invention, in addition to the bottom fold creasing means and the bottom fold creasing means, the bottom crease device is provided with a bottom fold creasing means for forming a bottom fold line and a bottom folding line for forming a square bottom of the paper tube. It is the structure which provided the flap fold folding means to attach the diagonal crease which becomes the crease | fold of the flap piece of a front side and a back side to the both ends of the front end of a paper tube from a crease.

  According to a second aspect of the present invention, there is provided a position opposed to a back side opening claw that presses a gusset edge on the back side of the paper tube of the first bottom opening device portion on the peripheral surface of the bottom folding drum, and on the back side of the paper tube. A plurality of intake holes are provided in a row in the axial direction at a position facing the back surface on the front end side from the bottom folding line of the flap piece, and further opposed to the back side of the central portion in the width direction of the front end portion of the flap piece on the back side. The plurality of intake holes are provided in a line in the direction of rotation of the bottom folding drum.

  According to a third aspect of the present invention, the second bottom opening device includes a side guide for guiding both sides of the front end portion of the paper tube opened by the first bottom opening device, and a width direction central portion. A center guide that contacts and folds along the bottom folding line, a center press roller that is located downstream of the center guide and presses the central portion of the paper tube, and a flap that is located downstream of the center press roller. A center edge guide that guides the opposite ends in the width direction, a side edge guide that is located on both sides of the center guide and touches the top surface on both sides in the width direction of the paper tube, and a width of the paper tube that is located on both sides of the side edge guide It is the structure which consists of a side press board which presses the upper surface of a direction both sides.

  According to a fourth aspect of the present invention, the folding device includes a front side flap piece folding device that folds the flap piece on the front end side of the flap on the front side of the paper tube, and a folding piece on the front side of the flap on the back side. It consists of a back side flap piece folding device, and it passes over the front side flap piece folding device from the rear side of the front side flap piece of the paper tube while rolling over the bottom folding drum at a speed faster than the movement of the paper tube. It is the structure using the flap piece folding roll which folds a flap piece inside.

  Further, according to a fifth aspect of the present invention, the folding device includes a front side flap piece folding device that folds the flap piece on the front end side of the flap on the front side of the paper tube, and a folding piece on the front side of the flap on the back side. It is composed of a back side flap piece folding device, and is in contact with the back side flap piece folding device to the flap piece on the back side of the paper tube that rotates in the opposite direction to the bottom folding drum and moves along the rotation of the bottom folding drum, It is the structure using the flap piece folding roll which folds this flap piece inside.

  The structure of claim 6 is the structure described in each of the above claims, wherein the press device is a pair of left and right brackets and an end member that is rotatably supported by the bracket and connected to the drive device on one side, An intermediate shaft that is detachably mounted between the both end members via a coupling and arranged coaxially, and a plurality of rollers that are fixed to the intermediate shaft so as to be movable in the axial direction.

  According to a seventh aspect of the present invention, a pair of press rolls each having a surface made of rubber or metal are provided in the transport device, and the folded bottom is formed in a smooth shape by passing a paper tube between the press rolls. Further, according to the configuration of claim 8, a delivery drum is provided in the downstream portion of the transport device, and the corner bottom portion of the paper tube transported by the transport device is provided around the delivery drum. A gripping claw that feeds the stacking portion over the tip is configured to be opened and closed by a cam mechanism provided in the delivery drum.

  The present invention is as described above, and in the configuration according to claim 1, the folding line for forming the bottom of the paper tube is a tip part that forms the square bottom of the paper tube in addition to the bottom folding line and the bottom folding line. It is possible to provide diagonal folding lines for folding flaps on both sides of the flap, and when opening the bottom part along each folding line in a square shape, the flap part can be smoothly folded along the diagonal folding lines, As a result, the paper used in the paper tube can be accurately shaped from the thin paper to the thick paper, and the shape of the bottom flap can be accurately formed, and in particular in the case of thin paper, it can be folded and formed without wrinkles.

  Further, in the configuration according to claim 2, the back side surface of the portion constituting the square bottom of the paper tube in the first bottom opening device is sucked by each intake hole, and both width direction ends of the flap piece on the back side The center part at the front end in the width direction can be sucked into the bottom folding drum, and the opening operation in the first bottom opening device is reliably performed without wrinkling in this part. be able to.

  In the configuration according to claim 3, the bottom portion in the state where the front side is opened from the back side portion of the paper tube by the first bottom opening device is formed by the side guide of the second bottom opening device. While the both sides are guided, the front side flap is folded by the center guide, the gusset edge of the square bottom is pressed by the side edge guide, the center part is pressed by the center press roller, and the flap is further turned by the center edge guide. The front and back flaps are pressed by the press plate while the opposite ends in the width direction are positioned at the center, so that the flap part opened at the bottom of the paper tube is flat along each folding line. Can be folded into Further, each guide member can be adjusted smoothly only in the width direction of the paper tube, and does not require other complicated adjustments, and the bottom opening process of the paper tube can be performed smoothly.

  Moreover, in the structure which concerns on Claim 4 and Claim 5, the flap piece of the front end side of both front side and back side flaps can each be folded in a roll, and especially in the roll in Claim 4, this roll is a bottom folding drum. The above folding operation is performed while rolling, so that the front flap piece can be folded accurately and in close contact with the flap body. In addition, since both the flap pieces are folded by rolls with rotation, the frictional resistance from the roll is hardly applied to the flap pieces, and the flap pieces can be folded in a correct posture without being distorted.

  Furthermore, in the structure which concerns on Claim 6, the press roll of a press apparatus can be easily attached or detached with the axis | shaft which supports this, Therefore The number and magnitude | size of this press roll are matched with the change of the width | variety, paper thickness, etc. of a paper cylinder. Can be exchanged freely.

  Further, in the configuration according to claim 7, the paper tube with the folded corner bottom portion is pressed by a pair of press rolls provided therein while being conveyed through the conveying device, and the folded bottom portion thereof is It can be formed in a smooth state. Further, in the invention according to claim 8, each of the paper cylinders conveyed by the conveying device passes through the delivery drum, and each of the paper cylinders is surely and orderly by the gripping claw provided on the delivery drum. It can be accumulated in the accumulation unit. In addition, in the structure which concerns on this 8th, by making the pinch nail long in the axial direction of a delivery drum and gripping the front-end | tip of a corner bottom part of a paper cylinder over the full width, the crease | fold at the end of a corner bottom part is pressed more smoothly. be able to.

FIG. 1 and FIG. 2 show a process sequence for continuously forming a square bottom paper bag from a cylindrical paper tube. FIG. The diagonal folding lines A and A that are the folding lines of the front and back flap pieces on both sides of the tip part that becomes the corner bottom part, and the bottom folding line B and the bottom folding line C that are parallel to the tip and in order from the tip side are predetermined. 1 (b) is a first opening process for opening gusset edges D ₁ and D ₂ on both sides between the bottom folding line B and the bottom folding line C, and FIG. A second opening step in which the front side flap E ₁ and the back side flap E ₂ are folded back and forth along the respective folding lines A, A, B, and C, FIG. 1 (d) shows the front and back side flaps E _1. a pressing step of pressing a substantially one plane shape in close contact with the paper cylinder 1 in a state in which each of E ₂ is opened.

FIG. 2 (a) is performed subsequent to the above pressing step, and a gluing step of applying glue G to predetermined positions of the front and back flaps E ₁ and E ₂ , and FIG. 2 (b) is a front and back flap E ₁ , FIG. 2C shows a folding process in which each of the front and back flap pieces on the front side from the bottom folding line B of E ₂ is folded. FIG. 2C shows a first folding process in which the flap piece of the front flap E ₁ is folded, FIG. (d) is a second folding step of folding the rear flap piece of the flap E ₂ on the upper side of the front flap E ₁ of the flap piece.

  The paper tube 1 supplied to the crease forming process in the above process is formed by folding the paper that has been cut into a predetermined dimension in the previous process into two by a folding device, and both sides of the paper cylinder 1 are M-shaped gussets. The side edge is folded and glued so as to be formed into a paper tube shape having front and rear openings.

  FIG. 3 schematically shows a bag making machine for a square bottom bag for forming a square bottom paper bag according to the above-described steps shown in FIGS. 1 and 2, wherein 2 is a folding line for performing a folding process. The attaching device 3 is a paper tube supply device for supplying the paper tube 1 to the folding device 2. 4 and 5 are first and second bottom opening devices that perform bottom opening in the first opening step and the second opening step, 6 is a pressing device that performs a pressing step, 7 is a gluing device that performs a gluing step, and 8 is A folding apparatus 9 for performing the folding process, and 9 is a folding apparatus for performing the first and second folding processes. Reference numerals 10, 11, and 12 denote a transport device, a press device, and a delivery device provided on the downstream side of the folding device 9.

  The paper tube supply device 3 includes, for example, a conveyor chain 16 driven by a drive motor 15 via a transmission mechanism and a pair of upper and lower press rolls 17a and 17b. The paper tube 1 formed into a cylindrical shape in the process is supplied to the folding device 2 in a pressed state.

  As shown in FIG. 4, the folding device 2 includes an upper body shaft 18 and a lower body 19 that sandwich the passage of the paper tube 1 up and down and rotate synchronously with the traveling direction of the paper tube 1. A pair of oblique blades 20 are provided in the shape of a letter C in the axial direction for attaching the pair of oblique folding lines A, A for the flap pieces shown in FIG. The upper body shaft 18 is provided with a receiving surface 21 that presses against the oblique blade 20 of the lower body 19 in a fan shape. The pair of oblique blades 20 can change the axial interval of the lower body 19 by a side lay.

  A bottom folding line blade 22 is provided upstream of the oblique blade 20 of the lower body 19 in the rotational direction, and a corresponding bottom bending line blade receiver 23 is provided on the upper body shaft 18. A blade receiving surface 24 for bottom folded bars is provided on the downstream side in the rotational direction. A rotating drum 25 is supported on the upper drum shaft 18 so as to be rotatable with respect to the upper drum shaft 18, and a bottom folding bar blade 26 is provided on the rotating drum 25. The rotating drum 25 is supported on the upper drum shaft 18 via an adjusting bolt 27. By rotating the adjusting bolt 27, the rotating drum 25 to which a nut 28 to which the adjusting bolt 27 is screwed is fixed. Is rotated in the circumferential direction with respect to the upper trunk shaft 18 so that the position of the bottom folding blade 26 can be adjusted in the circumferential direction.

  In this folding line attaching device 2, when the paper tube 1 passes between the upper body shaft 18 and the lower body 19, the oblique folding lines A and A that become the folding lines of the flap pieces as shown in FIG. Is the slant blade 21, the bottom folding bar B is the bottom folding bar blade 22 and the bottom folding bar blade receiver 23, and the bottom folding bar C is the bottom folding bar receiving surface 24 and the bottom folding bar blade 26. It is attached at each.

  The diagonal folding lines A and A at this time are 45 degrees, and the distance from the tip to the bottom folding line B is such that the tips of the two overlap when the front and back flap pieces are folded back. The distance between the bottom and bottom folding lines B and C is set to ½ of the gusset width on both sides of the paper tube 1.

  The first bottom opening device 4 is configured as shown in FIGS. In the figure, reference numeral 31 denotes a bottom folding drum having a structure divided into a plurality of parts in the circumferential direction, and 32 denotes a rotating shaft that is provided in parallel to the bottom folding drum 31 and rotates in the direction opposite to the bottom folding drum 31. A pair of presser disks 33, 33 facing each other with a slight gap on the outer periphery of the bottom folding drum 31 are engaged with each other in the rotational direction at a position separated from the rotational shaft 32 in the axial direction. Is fitted so that the distance between the discs 33 and 33 can be changed. The presser discs 33 and 33 are adjusted in position so as to be in contact with the surfaces of both sides of the paper tube 1. Bracket discs 33a and 33a are integrally provided at intervals outside the presser discs 33 and 33 in the axial direction.

  An arc plate 34 having an arc diameter the same as that of the presser disc 33 is provided at the intermediate portion of the rotating shaft 32, and a vacuum cup 35 is fixed to the rotating shaft 32 at the downstream end in the rotation direction of the arc plate 34. In addition, it is provided in communication with an intake passage (not shown) provided on the rotary shaft 32.

The retainer disc 33, enters the inside of the front gusset edge D ₁ of the between Sokoorisuji B and the bottom folding muscle C of the paper tube 1 shown in FIG. 1 (b), moved in the opening direction so The front-side opening claw 36 is provided on both sides in the axial direction so as to be rotatable and movable in the axial direction.

  The front-side opening claw 36 is positioned between the circular plates 33 and 33a, with one end fixed to a claw shaft 37 that passes through the presser disc 33 and the bracket disc 33a and is rotatable and axially movable. It is fixed to the tip of the arm 38. The front opening claw 36 has an L-shaped tip piece that is substantially parallel to the circumferential surface of the presser disc 33. When the claw shaft 37 is rotated, the arm 38 is rotated and the front opening claw 36 is opened. The tip piece of the claw 36 comes in contact with and separates from the circumferential surface of the presser disc 33. Further, when the claw shaft 37 moves in the axial direction, the front opening claw 36 comes in contact with and separates from the outer surface of the presser disc 33.

  A tip contact 39 is fixed to the tip of the outer end of the claw shaft 37 protruding from the bracket disc 33a, and a rotating contact 40 provided on the side surface in a direction perpendicular to the axis is fixed to the tip. An axial cam 41 with which the tip contactor 39 abuts and a rotation direction cam 42 with which the rotation contactor 40 abuts are fixed to the boss member 43.

  The boss member 43 is fitted to the boss portion of the presser disc 33 so as to be rotatable and locked in the axial direction. The boss member 43 is engaged with a locking member 45 provided on the frame 44 that supports the rotary shaft 32 so as to be movable in the axial direction, and the boss member 43 of the rotary shaft 32 is moved by a moving device (not shown) (or manually). The presser disc 33 is moved in the axial direction by the movement of the boss member 43, and the distance between the pair of presser discs 33, 33 depends on the width of the paper tube 1. The position is adjusted.

  The claw shaft 37 is spring-biased by a spring (not shown) in the direction in which the tip contactor 39 abuts against the axial cam 41. As shown in FIG. The piece is biased by a spring member 46 such as a rubber string or a tension spring in a direction in which the piece comes into contact with the circumferential surface of the presser disc 33.

  The shape of the rotation direction cam 42 with which the rotation contact 40 abuts is composed of a first opening cam 42a and a second opening cam 42b, as shown by a chain line in FIG. When the front opening claw 36 moves in the circumferential direction in accordance with the rotation of the presser disc 33, the first opening cam 42a first comes into contact with the first opening cam 42a so that the front opening claw 36 comes into contact with the first opening cam 42a. After the tip end piece 36 gradually moves away from the circumferential surface of the presser disc 33 from the position closest to the bottom folding drum 31, the first tip piece comes into contact with the presser disc 33 again to perform the first separating operation. ing. Further, the second opening cam 42b performs a second separating operation in which the rotating contact 40 abuts against the second opening cam 42b and the front opening claw 36 separates and contacts the presser disc 33 again. It has a shape.

  On the other hand, the relationship between the tip contact 39 of the claw shaft 37 and the axial cam 41 is not shown in detail in the shape of the axial cam 41, but by contact between the tip contact 39 and the axial cam 41. The front-side opening claw 36 moves outward in the axial direction of the presser disc 33 between the first separation / contact operation and the second separation / contact operation.

  A back side opening claw 51 which is paired with the front side opening claw 36 is provided on the bottom folding drum 31 side as shown in FIG.

  The back side opening claws 51 are projected and retracted in conjunction with the front side opening claws 36 from the notches 52 provided on both sides in the axial direction of the bottom folding drum 31 in FIG. The gusset edge on the back side of the paper tube 1 is opened. The above-described operation of the back-side opening claw 51 is performed by contacting a contact provided on the back-side claw 51 with a cam (not shown) provided on a cam member provided on a fixed member such as a frame in the bottom folding drum 31. It has come to be. A portion provided on the bottom folding drum 31 as a portion that the leading end piece of the back side opening claw 51 contacts and grips the gusset edge on the back side of the paper tube 1 is a holding member 53 that extends over the entire length in the axial direction. A plurality of intake holes 54 a are provided in the longitudinal direction of the surface of 53. Further, a movable claw 55 is provided on the downstream side in the rotation direction of the bottom folding drum 31 from the clamping member 53 so as to be slightly movable in the rotation direction of the bottom folding drum 31, and the movable claw 55 is rotated by the rotation of the bottom folding drum 31. By moving toward the downstream side, a small groove is formed between the bottom folding drum 31.

  A catching claw 56 that holds the back end of the paper tube 1 on the circumferential surface of the bottom folding drum 31 and captures the bottom folding drum 31 at the axially central portion on the downstream side in the rotational direction from the movable claw 55. It is provided so that it can appear and disappear. The suction holes 54b are provided in a row in the rotational direction in a row in the central portion in the axial direction of the bottom folding drum 31 facing the catching claws 56. A plurality of suction holes 54c for bag width are provided in a row in the axial direction on the downstream side of the movable claw 55 of the bottom folding drum 31 and on both sides in the axial direction.

Axially opposite sides of the rotational direction upstream of the rear spreading claws 51 of the bottom folding drum 31, when the stand folding front flap piece of the flap E ₁ of the bag bottom operating cooperates in folding stand device 8 described later A rear presser claw 57 and a rear raising claw 58 are provided (FIGS. 5 and 8).

  FIGS. 10 and 11 are schematic operation explanatory views for showing a first opening operation in the first bottom opening device 4. The first bottom opening process will be described with reference to these drawings and FIG.

The paper tube 1 guided by the guide plate 60 and transported from the folding device 2 between the bottom folding drum 31 and the presser discs 33, 33 is adsorbed by the vacuum cup 35 at the front end portion thereof. The portion is guided by the circular arc plate 34 and is separated from the tip on the back side. Next, the front and back opening claws 36 and 51 enter inside the front and back gusset edges D ₁ and D ₂ between the bottom folding line B and the bottom folding line C of the paper tube 1, and the presser disc 33, The both gusset edges D ₁ and D ₂ are opened by the contact operation with the bottom folding drum 31. At this time, the back surface of the paper cylinder 1 is attracted by the suction holes 54a formed in the holding member 53 corresponding to the back side of the gusset edge D _2, which tip is captured by the capture pawl 56 with further the capture claw 56 Is sucked through a single row of suction holes 54b provided in the central portion opposite to each other. At this time, both sides in the width direction on the back side of the paper tube 1 and on the front end side from the bottom folding line B are formed in the suction holes 54c for the bag width provided on the downstream side in the rotation direction from the movable claw 55 of the bottom folding drum 31. Sucked. Each of the suction holes 54a, 54b, 54c is closed with a stopper such as a screw at a position disengaged from the paper tube 1, and sucks only the paper tube portion.

  By the first bottom opening process by the first bottom opening device 4, the bottom portion of the paper tube 1 becomes as shown in FIG. 1B, the front end portion is raised from the bottom folding line C, and the front end portion is opened. Is done.

  Next, the 2nd bottom opening apparatus 5 provided in the downstream of the said 1st bottom opening apparatus 4 is demonstrated based on FIG. 12, FIG.

  The second bottom opening device 5 includes a center guide 61, a pair of side guides 62 and 62 in the axial direction, side edge guides 63 and 63, center edge guides 64 and 64, side press plates 65 and 65, and a center press roller. 66, which are provided toward the upstream side in the movement direction of the paper tube 1.

The center guide 61 has a slope shape so as to receive the center portion of the bottom portion opened in the first opening process and press the front end portion in the direction of folding from the bottom folding line C and press it against the bottom folding drum 31. ing. The side guides 62 and 62 are provided at positions for guiding both sides of the paper tube 1, and the side edge guides 63 and 63 are configured to press both side portions of the bottom portion folded back by the center guide 61 against the bottom folding drum 31. ing. Furthermore, the center edge guides 64 and 64 are configured to guide opposite ends in the width direction of the flaps E ₁ and E ₂ pushed and opened by the center guide 61. The center press roller 66 presses the center of the paper tube 1 passing through each guide against the bottom folding drum 31. The center press roller 66 is provided with a groove in the center in the axial direction so as not to interfere with the catching claw 56.

  The center guide 61 in this configuration is supported by the mounting rod 66b via the arm 66a so that the height can be adjusted. Further, the side guides 62 and 62 and the side edge guides 63 and 63 are supported on the frame side so that the height can be adjusted by a support member (not shown) and the distance between them can be adjusted according to the width of the paper tube 1. ing. Further, the center edge guide 64, the side press plate 65, and the center press roller 66 are supported on the frame side through height adjustment via arms 64a, 65a, 66c, respectively, and the center edge guide 64, side press plate 65 are supported. Can be adjusted in the opposite width direction.

In the second bottom opening device 5, the front end portion folded back by the first bottom opening device 4 is crushed by the center guide 61, and the front side flap E ₁ is shown in FIG. and it is opened on the back side of the flap E _2. At this time, both lateral ends of the flaps E ₁ and E _{2 in} the left-right direction are guided by side guides 62 and 62. The upper surfaces of both flaps E ₁ and E ₂ on both sides in the left-right direction are pressed by side edge guides 63 and 63 and a side press plate 65. Further, the opposite ends of the bottoms of the flaps E ₁ and E ₂ are guided by center edge guides 64 and 64. Further, the center portions in the left-right direction of both flaps E ₁ and E ₂ are pressed by a center press roller 66.

  The pressing device 6 is provided immediately downstream of the second bottom opening device 5 as shown in FIGS. 14 and 15, the press roller 67 includes a pair of left and right brackets 68 and 68, a support shaft 69 rotatably supported by both the brackets 68 and 68, and this support. The shaft 69 includes a plurality of rollers 67a and 67b that are movable in the axial direction. Both brackets 68, 68 are rotatably connected to one end of a connecting rod 70 at an eccentric position thereof, and the connecting rod 70 is supported by a bracket 71 provided on the frame side so as to be adjustable in length. By adjusting the length of the connecting rod 70, the left and right brackets 68, 68 are rotated in the vertical direction so that the pressing force by the press roller 67 is adjusted.

  As shown in FIG. 13, the support shaft 69 is axially divided into end members 69a and 69b rotatably supported by the brackets 68 and 68 and an intermediate member 69c, and the intermediate member 69c is pressed. Rollers 67a, 67b, 67c, and 67d are fixed. Both end portions of the intermediate member 69c and both end members 69a and 69b are coupled in the rotational direction by couplings 72 and 72. Both the couplings 72, 72 are movable in the axial direction, and the intermediate member 69c can be removed from both end members 69a, 69b by moving the couplings 72, 72 until they are disengaged from the intermediate member 69c. . As shown in FIG. 14B, the coupling 72 is provided with a slot 72a in the axial direction. The width of the slot 72 is tightened with a bolt 72b so that the coupling 72 is fixed to the shaft portion and supported. End members 69a and 69b of the shaft 69 are connected to the intermediate member 69c.

  As described above, the press roller 67 is composed of a plurality of rollers 67a, 67b... The number of the rollers is increased or decreased according to the width of the paper tube 1. The rollers 67a, 67b. The increase / decrease can be easily performed by loosening the bolt 72b of the coupling 72 and removing the intermediate member 69c from both end members 69a, 69b.

Then, the flaps E ₁ and E ₂ developed by the second bottom opening device 5 are pressed by the pressing device 6 as shown in FIG. 1 (d).

  As shown in FIGS. 3 and 14, the gluing device 7 is arranged on the downstream side of the press device 6, and for example, a tank 75 for storing starch glue or a chemical glue-based adhesive and a synthetic rubber or the like on the outer peripheral surface. A gluing roller 77 having a gluing pad 76, a relay roller 78 provided between the tank 75 and the gluing roller 77 facing the opening of the tank 75, and a tray provided below the tank 75 and the relay roller 78. And have. The gluing roller 77 is movable in the contact and separation direction with respect to the bottom folding drum 31 by an air cylinder (not shown) or the like.

Then, the adhesive in the tank 75 is attached to the gluing pad 76 of the gluing roller 77 via the relay roller 78, and the front side and the back side flaps E ₁ and E ₂ have predetermined positions (patterns) by the rotation of the gluing roller 77. It is supposed to be glued to.

  At this time, the gluing pattern by the gluing pad 76 needs to be changed according to the size of the paper tube 1 or the like. For this reason, although not shown in the figure, the gluing pad 76 is a pad setting sheet that is detachably attached to the outer peripheral surface of the gluing roller 77, and a predetermined pattern is used, and this pad setting sheet is replaced whenever the gluing pattern changes. I am doing so.

Bottom folding drum 31 is arranged on the outer periphery of the bottom folding drum 31 as described above, the capture claw 56 sandwiched between the circumferential surface of the bottom folding drum 31 the tip of the flap E ₂ of the back side of the paper cylinder 1, A gusset edge D on the back side of the paper tube 1 corresponding to the holding claw 53 and the movable claw 55 that bite the front and back positions of the bottom folding line C of the flap E _{2 on} the back side, and the front side opening claw 36 of the first bottom opening device 4 ₂ , a rear opening claw 51 that sandwiches ₂ , a rear presser claw 57 that holds the rear side from the bottom folding line B on the upper side of the flap E _{1 on} the front side, and a lower side of the flap E on the front side and from the bottom folding line B A plurality of intake holes 54 a and 54 b for adsorbing the rear raising claw 58 inserted on the front side and the flap E ₂ on the back side to the surface side of the bottom folding drum 31 are provided.

The catching claw 56 is located at the center of the bottom folding drum 31 in the axial direction, and its tip extends from the groove to the outside of the outer periphery of the bottom folding drum 31. so that the front end of the rear side of the flap E ₂ is sandwiched between 31 the outer peripheral surface of the. On the other hand, Kyojitsume 53 and the movable pawl 55, by the opening and closing of the movable claw 55, so as to sandwich the front and rear Sokoorisuji B on the back of the flap E _2. The catching claw 56 and the movable claw 55 are not shown, but a contact provided on an arm extending in the bottom folding drum 31 is fixed to a cam provided on the frame side in the bottom folding drum 31. A predetermined operation is performed by contact according to the rotation of the bottom folding drum 31.

  As shown in FIGS. 8 and 15 to 17, the pair of the presser claw 57 and the rear raising claw 58 are arranged on each side of the bottom folding drum 31 in the axial direction. The rear presser claw 57 and the rear raising claw 58 are respectively connected to movable shafts 82 and 83 that are supported in the bottom folding drum 31 so as to be slidable and rotatable on a support bracket 81 provided integrally therewith. It is provided at the tip of each of the fixed arms 82a and 83a. The movable shaft 82 that supports the rear presser claw 57 has a rotation direction contact 84 for rotating the rear presser claw 57 toward the peripheral surface of the bottom folding drum 31, and a movable shaft that supports the rear raised claw 58. The shaft 83 is provided with a rotation direction contact 85 for rotating the rear raising claw 58 in a direction away from the peripheral surface of the bottom folding drum 31.

  Further, the outer ends of the movable shafts 82 and 83 are axial contacts 86 and 87 as shown in FIGS. 16 (a) and 16 (b).

  Then, as shown in FIGS. 16A and 16B, each axial contact 86, 87 of each movable shaft 82, 83 is positioned on the side of the bottom folding drum 31 and fixed to the main body frame. The directional cams 88 and 89 are spring-biased and brought into contact with each other, and the movable shafts 82 and 83 reciprocate in the axial direction according to the shape of the cams 88 and 89.

  Also, as shown in FIGS. 16 (a) and 16 (b), it is integrated with the axial cams 88 and 89, and is provided on the movable shaft 82 for the back press at the radially inner side of the bottom folding drum 31. The rotation direction cam 90 that contacts the rotation direction contact 84 that is in contact with the rotation direction contact 85 provided on the movable shaft 83 for raising the rear side of the bottom folding drum 31 in the radial direction. A cam 91 is provided, and when the contactors 84 and 85 come into contact with these cams 90 and 91, the rear presser claw 57 and the rear raising claw 58 are attached to the bottom folding drum 31 via the movable shafts 82 and 83. It comes in contact with and away from the peripheral surface. Each of the movable shafts 82 and 83 is urged in a direction in which the respective rotation direction contacts 84 and 85 come into contact with the cams 90 and 91 by a spring member (not shown).

  As shown in FIG. 18, the cams 88, 89, 90, 91 provided on the main body frame side are arranged at positions corresponding to the timing of contact with the contacts 86, 87, 84, 85.

Then, the rotation shaft 82 of the rear presser claw 57 moves inward in the axial direction when the axial contact 86 thereof contacts the axial cam 88, and the rear presser claw 57 in FIG. _The bottom claw 57 is located in the rear upper inner side of the bottom folding line B, and the rotation direction contact 84 comes into contact with the rotation direction cam 90, so that the rear presser claw 57 contacts the circumferential surface of the bottom folding drum 31. Go and adapted to press the rear side of Sokoorisuji B on the front side of flap E _1.

Further, the rotary shaft 83 of the rear raising claw 58 is moved inward in the axial direction when the axial contact 87 of the rear raising claw 58 comes into contact with the axial cam 89, and the rear raising claw 58 in FIG. The rear raising claw 58 is separated from the peripheral surface of the bottom folding drum 31 by being inserted below the distal end side of the bottom folding line B of E ₁ and the rotational direction contact 85 comes into contact with the rotational direction cam 91. moves in the direction (upward) has a front flap piece of the flap E ₁ to make folding at the folds of Sokoorisuji B.

As shown in FIGS. 3, 19, and 20, the folding device 8 is provided with a rotating shaft 96 provided with two flat pressing blades 95 a and 95 b facing the bottom folding drum 31, The rotation shaft 96 is rotated in the opposite direction in synchronization with the rotation of the bottom folding drum 31, and the rotation of the rotation shaft 96 causes the flaps E ₁ , E on the front and back of the paper tube 1 conveyed by the bottom folding drum 31. ₂ , when the bottom folding line B of the flap E _{2 on} the back side comes to the position of the clamping member 53 and the movable claw 55, the tip of one pushing blade 95 a faces this position, and the bottom of the flap E _{1 on} the front side When the folding line B comes between the rear presser claw 57 and the rear raised claw 58, the tip of the other pressing blade 95b is opposed to this position.

Then, as shown in FIG. 18, after the catching claw 56 that has held the tip of the flap E _{2 on} the back side is opened, one pushing blade is interposed between the movable claws 55 that are open with respect to the clamping member 53. The tip of 95a enters, and thereby the bottom folding line B of the flap piece on the back side is pushed into the opening groove. Then, in a state in which the pushing blade 95a is missing, by chewing before and after Sokoorisuji B on the back of the flap E ₂ close the movable claw 55, the tip end of the flap piece from the back of the flap E ₂ Sokoorisuji It is designed to be raised along B.

Further, as shown in FIG. 19, the flap piece of the flap E _{1 on} the front side of the paper tube 1 in a state in which the rear side of the bottom folding line B is pressed by the rear presser claw 57, the other pressing blade The tip of 95b abuts and is raised when the rear raising claw 58 inserted into the lower front side of the bottom folding line B moves upward.

As shown in FIG. 3, the folding device 9 includes a front side flap piece folding device 9 a that folds inward the flap piece on the front end side of the front side flap E ₁ of the paper tube 1 folded by the folding device 8, and the back side. It has a distal end side of the flap piece of the flap E ₂ from the rear side flap strips folding device 9b for folding inward.

  The front flap piece folding device 9a is configured as shown in FIGS. 20 to 22, and includes first and second rotary shafts 97a and 97b spaced apart in the circumferential direction of the bottom folding drum 31, and bottom folding. A third rotary shaft 97c provided at a position spaced apart from the drum 31 in the radial direction is provided, and each of the rotary shafts 97a to 97c has two first and second shafts spaced apart in the axial direction. 2. A third sprocket 98a, 98b, 98c is fixed, and a pair of axial chains 99a, 99b are stretched around each of the sprockets 98a-98c. The first flap piece folding roll 100 is rotatably supported by the pair of chains 99a and 99b facing in the axial direction, and the chains 99a and 99b rotate in the same direction as the peripheral surface of the bottom folding drum 31. By being driven, the first flap piece folding roll 100 comes into contact with the peripheral surface of the bottom folding drum 31 and rolls between the first and second rotating shafts 97a and 97b.

  A driving shaft 101 shown in FIG. 21 is connected to one of the front side flap piece folding devices 9 a, for example, a first rotating shaft 97 a via a transmission device 102. The drive shaft 101 rotates in synchronization with the bottom folding drum 31, the folding device 8, and the like. 20 and 22, the drive shaft 10 and the transmission device 102 are not shown.

  The transmission device 102 has an intermediate shaft 102a. A pair of elliptical gears 103 and 104 meshing with the drive shaft 101 and the intermediate shaft 102a are fixed to the drive shaft 101 and the other is fixed to the intermediate shaft 102a. In contrast, it is provided to be rotatable. The driven elliptical gear 104 and the rotary shaft 97a are connected by a synchronous adjustment device 105 that is a planetary gear mechanism.

  The synchronization adjusting device 105 is supported by a sun gear 106 fixed to the intermediate shaft 102a and a carrier that is engaged with the sun gear 106 and provided on a driven elliptical gear 104 that is rotatably supported by the intermediate shaft 102a. A plurality of (four) planetary gears 107, ring gears 108 having internal teeth meshing with the planetary gears 107 and having external teeth on the outer periphery, and meshing with the external teeth of the ring gear 108 for rotation. A driven gear 109 fixed to a shaft 96a and a worm device 110 for adjusting the phase in the rotational direction of the sun gear 106 are included.

  In this configuration, when the drive shaft 101 is rotationally driven, the first rotary shaft 97a is rotated to travel the chains 99a, 99b, and the first flap piece folding roll 100 supported by the chain 99a, It moves along the travel path 99b and rolls in contact with the outer peripheral surface of the bottom folding drum 31 between the first rotating shaft 97a and the second rotating shaft 97b.

Then, in the section in which the first flap piece folding roll 100 moves in contact with the bottom folding drum 31, the rotation of the rotary shaft 97a is accelerated by the elliptical gear mechanism of the transmission device 102, and the first flap piece folding roll 100 The moving speed of 100 becomes faster than the peripheral speed of the bottom folding drum 31. Thus, the first flap piece folding roll positioned on the rear side of the front flap E ₁ folded in the folding process of the previous process in the paper tube 1 conveyed at the peripheral speed of the bottom folding drum 31. 100 moves overtake flap E ₂ of the front side, the tip end of the flap piece of the front flap E ₁ is folded inwardly by the operation.

  The rotational phase of the first flap piece folding roll 100 with respect to the rotational speed of the bottom folding drum 31 at this time is adjusted by changing the rotational phase of the sun gear 106 by changing the rotational direction phase of the intermediate shaft 102a by the worm device 110. Is done.

  The back side flap piece folding device 9b of the folding device 9 is provided on the downstream side of the front side flap piece folding device 9a. The back side flap piece folding device 9b has the same circumferential rotation as the circumferential rotation of the bottom folding drum 31. It is comprised in the 2nd flap piece folding roll 111 which rotates in the direction. And this 2nd flap piece folding roll 111 is driven by the conveyance belt 112 which comprises the conveying apparatus 10 distribute | arranged downstream from the folding apparatus 9. As shown in FIG. Further, the second flap piece folding roll 111 is supported so as to be adjustable in position in the contact / separation direction with respect to the circumferential surface of the bottom folding drum 31 and in the circumferential direction of the bottom folding drum 31, that is, in the conveyance direction of the paper tube 1. Supported by structure.

Folding press In the rear flap piece folding device 9b, erected folding at folding stand device 8, the front flap piece folding device 9a back flap piece of the flap E ₂ which has passed through the are at the second flap piece folding rolls 111 are being folded inward at the front side flap strips overlap the upper side of the folded the front flap E ₁ of the flap piece at folding device 9a, thereby bottom flaps E _1, each flap piece E ₂ Closed.

  3 and FIG. 23, the conveying device 10 has a second flap piece folding roll 111 of the back side flap folding device 9b, a reversing drum 113 positioned downstream thereof, and a press device to be described later. 11, a feed roll 114 a arranged on the inlet side, a conveyor belt 112 wound around these, a guide roll 115 arranged on the downstream side of the reversing drum 113, and another feed paired with the feed roll 114 a It is composed of a roll 114b, a guide roll 115 and another feed roll 114b, and a pinching belt 116 wound around the reversing drum 113 from the upper side of the conveying belt 112 along the way.

In the transport device 10, the paper tube 1 in which both flaps E ₁ and E ₂ are folded by the folding device 9 is sandwiched between the transport belt 112 and the bottom folding drum 31 from the back side flap folding device 9b. Then, along the reversal drum 113, it is sent to the feeding rolls 114 a and 114 b that are sandwiched between the conveying belt 112 and the sandwiching belt 116 and are fed into the press device 11.

  The press device 11 is configured as shown in FIG. 3 and FIG. 23, and is composed of a pair of rolls 117 and 118 whose rolling contact surfaces are rotated toward the downstream side in the conveying direction. The surface is made of rubber and the other surface is made of metal. Then, by passing through this, the bottom-folded portion of the paper tube 1 is pressed, and the bulge of the corner bottom portion can be formed in a very thin smooth shape, and the glued portion is sandwiched and adhered. Yes. The distance between the axes of the two rolls 117 and 118 is adjusted, and the pressing force by the two rolls 117 and 118 is adjusted. Both rolls 17 and 118 may be rubber or metal.

  The delivery device 12 is provided so as to face the upper conveyance belt 119 extending downstream of the press device 11, the sandwiching belt 116 of the conveyance device 10, and the discharge terminal portion of both the belts 119 and 116. The delivery drum 120, the feed roll 121, and the stacking unit 122, and the paper cylinder 1 transported by the transport belt 119 and the sandwiching belt 116 is discharged to the stacking unit 122 by the delivery drum 120 and the feed roll 121. In this part, it is arranged. A counter (not shown) for counting the number of paper tubes 1 discharged to this portion is provided on the upstream side of the stacking unit 122.

  24, the delivery drum 120 in the delivery device 12 has gripping claws 123a, 123b in the rotational direction of the delivery drum 120 at positions opposed to the diameter direction thereof, as shown in FIGS. It is provided toward the upstream side. Both the gripping claws 123a and 123b can come into contact with the peripheral surface of the delivery drum 120, and are urged by a spring (not shown) in the contact direction to be provided in the delivery drum 120 integrally with the support shaft 124a. , 124b are rotatably supported.

  The gripping claws 123a and 123b are provided with arms 126a and 126b having arms 126a and 126b having rotating contacts 125a and 125b at the tips, respectively. The rotating contacts 125a and 125b are provided in the delivery drum 120 and delivered. The gripping claws 123 a and 123 b are separated from the delivery drum 120 by contacting a pair of rotating cams 127 a and 127 b provided on the frame side that supports the drum 120. These rotating cams 127a and 127b are arranged at the delivery inlet portion and the delivery outlet portion in the rotation direction of the delivery drum 120, so as to instantaneously open the gripping claws 123a and 123b at the respective positions. It has become.

  The gripping claws 123a and 123b are elongated in the axial direction of the delivery drum 120 and can be gripped over the entire width of the corner bottom end of the paper tube 1.

  A process for manufacturing a paper bag having a square bottom in the bag making machine configured as described above will be described below.

  The paper tube 1 formed into a cylindrical shape having M-shaped gusset portions on both sides in advance in the previous process is supplied from the supply device 3 to the folding device 2 via the press rolls 17a and 17b. .

  In this folding line attaching device 2, an oblique folding line A which becomes a folding line of a flap piece on both sides of the front end portion of the paper tube 1 by a pair of oblique blades 20 and a receiving surface 21 according to the rotation of the upper body shaft 18 and the lower body 19. , A, the bottom folding bar B and the bottom folding bar blade receiver 23 and the bottom folding bar blade receiver 23, and the bottom folding bar C and the receiving surface 24, respectively.

Thereafter, the paper tube 1 is transferred to the first bottom opening device 4, and first, the front end of the front side of the paper tube 1 is adsorbed by the vacuum cup 35, and at the same time, the center of the front end of the back side of the paper tube 1. Is adsorbed by the suction hole 54b provided in the center of the bottom folding drum 31 in the axial direction, the front end on the front side moves upward along the arc plate 32, and the front end on the back side moves along the bottom folding drum 31. Thus, the leading end of the paper tube 1 is opened up and down, and at the same time, the catching claw 56 is operated and the leading end on the back side is sandwiched between the peripheral surfaces of the bottom folding drum 31. Further, each suction upstream of Sokoorisuji B of the back flap E ₂ in this time by the holding member 53 of providing a suction hole 54a, also at suction holes 54c of the downstream side of the Sokoorisuji B is provided on the bottom folding drum 31 Then, both side portions of the back side flap E ₂ are sucked to the peripheral surface side of the bottom folding drum 31.

In conjunction with the above operation, the gusseted edges D ₁ and D ₂ between the bottom folding line B and the bottom folding line C of the paper tube 1 are opened by the operation of the front and back side open claws 36 and 51.

  On the other hand, the rear presser claw 57 and the rear raised claw 58 are respectively connected to the movable shafts 82 and 83 to which the rear presser claw 57 and the rear raised claw 58 are fixed until the catching claw 56 holds the tip of the back side of the paper tube 1. The axial contacts 86 and 87 are positioned on both sides of the bottom folding drum 31 by spring biasing without contacting the axial cams 88 and 89, and the presser pawl 57 and the rear raising pawl 58 are respectively The rotation direction contacts 84 and 85 are not in contact with the rotation direction cams 90 and 91, and the presser claw 57 and the rear raising claw 58 are brought into contact with the peripheral surface of the bottom folding drum 31 by the spring bias. It is located outside the tube 1.

  Then, when the back end of the paper tube 1 is clamped by the catching claw 56, it is raised at substantially the same time, the axial contact 87 of the claw 58 comes into contact with the axial cam 89, and the rear raising claw 58 resists the spring in the axial direction. Then, the raised claw 57 is protruded to the upper side of the paper tube 1. On the other hand, before and after the projecting operation of the rear raising claw 57, the rotational direction contact 85 temporarily contacts the rotational direction cam 91 and the rear raising claw 58 moves up and down. Is brought into contact with the front side surface of the paper tube 1. At this time, the raised nail 58 is brought into contact with the front side surface of the paper tube 1 on the rear side of the bottom folding line C of the paper tube 1. Further, the rear presser claw 57 at this time is positioned outside the paper tube 1 in contact with the peripheral surface of the bottom folding drum 31.

In this state, the bottom of the paper tube 1 is opened by the operation of the first bottom opening device 4. And this time, gusset edge D by casement claws 36 and 51, the holding of _{D 2} is released.

The paper cylinder 1 whose bottom is opened in this way is guided to the second bottom opening device 5 according to the rotation of the bottom folding drum 31 while being guided by the side guides 62, 62, and the flap E _{1 on} the front side of the paper cylinder _1. Only the center guide 61 is folded along the bottom folding line C.

With this operation, both sides of the flap E _{1 on} the front side are pressed by the side edge guides 63, 63, the center is guided by the center edge guides 64, 64, and the center is pressed by the center press roller 66. Thus, both the front and back flaps E ₁ and E ₂ are in a state of being flattened along the peripheral surface of the bottom folding drum 31. The paper cylinder 1 is conveyed with the rotation of the bottom folding drum 31 in this state, the flap E ₁ of the front and back in the course this _conveyance, E ₂ is the rollers 67a of the press 6 is shaped to be pressed at 67b ... The At this time, since the rear presser claw 57 is positioned outside the paper tube 1, it is possible to reliably bend the both side ends of the bottom portion that are the bottom side line of the paper tube 1.

Simultaneously with the press operation by the press device 6, the rear presser claw 57 waiting on the outside of the bottom folding drum 31 has its axial contact 86 brought into contact with the axial cam 88 to resist the spring force inside. After that, the presser claw 57 is projected upward from the paper tube 1. On the other hand, the rotation direction contact 84 of the rear presser claw 57 is not contacted with the rotation direction cam 90 by a spring force, and the rear presser claw 57 projects over the paper tube 1 at the same time. The moving direction contact 84 comes into contact with the rotational direction cam 90 and the rear presser claw 57 is moved downward, and the rear pressing claw 57 of the flap E _{1 on} the front side of the paper tube 1 opened at the above-described operation is opened. It touches the upper side.

Thereafter, the paper cylinder 1 is conveyed according to the rotation of the bottom folding drum 31, and the pasting roller 77 is rotated by the pasting device 7, whereby the front and rear flaps E ₁ , E opened at the bottom by the pasting pad 76. Gluing is performed on a predetermined portion of ₂ . And after this gluing process is completed, the flap pieces of the front and rear flaps E ₁ and E ₂ are folded by the folding device 8.

In the folding device 8, as shown in FIGS. 18 and 19, when the rotary shaft 96 rotates, the tips of the pushing blades 95 a and 95 a are the bottoms of the flaps E ₁ and E _{2 on} the front side and the back side of the paper tube 1. It is bitten along the folding lines B and B. First, as shown in FIG. 18, the portion of the bottom folding line B of the flap E _{2 on} the back side is guided between the holding member 53 and the movable claw 55 which are opened by one pushing blade 95 a.

And this substantially simultaneously capture pawl 56 moves upward by actuation by a cam mechanism (not shown) in accordance with the rotation of the bottom folding drum 31, together with the distance from the flap E ₂ backside which has been sandwiched until it is movable claws 55 by closing operation at the operation of the not-shown cam mechanism, the front and rear is bitten by the clamping member 53 and the movable claw 55 bottom back flap piece of the flap E ₂ of Sokoorisuji B on the back of the flap E ₂ Folded from the folding line B.

Thereafter, as shown in FIG. 20, by the rotation of the rotating shaft 96, the other folding blade 95 b causes the bottom folding line B portion of the flap E _{1 on} the front side to be raised and raised between the claw 58 and the rear presser claw 57. Invite to the side. In this state, the rotation direction contact 87 of the rear raising claw 58 comes into contact with the rotation direction cam 91 and the rear raising claw 58 is rotated upward, whereby the bottom folding line in the flap E _{1 on the} front side. The flap piece on the tip side from B is folded.

Next, the paper tube 1 in which the respective flap pieces are folded from the front and back side flaps E ₁ and E ₂ is conveyed to the front side flap folding device 9a of the folding device 9, and as shown in FIGS. First, the first flap piece folding roll 100 is brought into contact with the rear side of the front flap piece by the rotation of the chains 99a and 99b, and the first flap piece folding roll 100 is moved faster than the peripheral speed of the bottom folding drum 31. Fold this front flap piece inward. At the same time, the preceding flap piece on the back side is pushed down by the second flap piece folding roll 111 of the back side flap folding device 9b, folded inward, and folded on the upper side of the front flap piece.

  Thereafter, the paper tube 1 is sandwiched between the conveying belt 112 and the pinching belt 116 of the conveying device 10, conveyed around the reversing drum 113, and conveyed to the pressing device 11 from the feeding rolls 114a and 114b. Eleven flaps 117 and 118 are pressed and each flap piece is glued to form the square bottom of the paper tube 1.

  Next, the paper tube 1 is conveyed by the delivery device 12 and discharged and collected in the stacking unit 122 while being counted by the counter. At this time, the paper tube 1 transported by the delivery device 12 is gripped by the gripping claws 123a and 123b at the delivery entrance portion of the delivery drum 120 and moves along the peripheral surface of the delivery drum 120. The tails of the gripping claws 123a and 123b are released at the delivery outlet and discharged to the stacking unit 122. At this time, the gripping claws 123a and 123b are elongated in the axial direction of the delivery drum 120 and are gripped over the entire width of the corner bottom end of the paper tube 1, so that the crease at the corner bottom end is gripped. , 123b is surely pressed smoothly.

(A), (b), (c), (d) is explanatory drawing which shows the first half side of the process of shape | molding a square bottom paper bag continuously. (A), (b), (c), (d) is explanatory drawing which shows the latter half side of the process which shape | molds a square bottom paper bag continuously. It is composition explanatory drawing which shows schematically the bag making machine of the square bottom bag which concerns on this invention. It is structure explanatory drawing which shows a crease forming apparatus. It is a partially broken side view which shows a 1st bottom opening apparatus. It is a front view which shows a 1st bottom opening apparatus. It is explanatory drawing which shows the action | operation mechanism of a front side opening nail | claw. It is a development top view showing the arrangement relation of the back side open claw, the catch claw, the back presser claw, and the rear raising claw provided on the bottom folding drum side. It is operation | movement explanatory drawing of a 1st bottom opening apparatus. It is operation | movement explanatory drawing of a 1st bottom opening apparatus. It is a top view which shows a 2nd bottom opening apparatus. It is a side view which shows a 2nd bottom opening apparatus. (A) is a partially broken side view showing a press device, and (b) is a sectional view of a coupling part. It is a partially broken side view which shows a gluing apparatus. It is a side view which shows the arrangement | positioning relationship of the back side open nail | claw provided in the bottom folding drum side, a catch nail | claw, a back press nail | claw, and a raising nail | claw. (A) is sectional drawing which shows the action mechanism of a back clamp nail | claw. (B) is sectional drawing which shows the action mechanism of a back raising nail | claw. It is a front view which shows the cam for act | operating a back press nail and a back raising nail | claw. It is a side view which shows the structure and operation | movement of a folding device. It is a side view which shows the structure and operation | movement of a folding device. It is a structure explanatory view showing roughly the composition of a folding device. It is sectional drawing which shows the drive mechanism of a folding device. It is a perspective view which shows the structure of a folding device roughly. It is explanatory drawing which shows a conveying apparatus, a press apparatus, and a delivery apparatus. (A), (b) is explanatory drawing which shows the structure and effect | action of a delivery drum.

Explanation of symbols

A ... diagonal Orisuji, B ... Sokoorisuji, C ... bottom folding muscle, _{D 1,} D 2 _... Machien, _{E 1,} E 2 _... flaps, 1 ... paper tube, 2 ... folding knurling device, 3 ... Paper Tube feeding device, 4, 5 ... 1st and 2nd bottom opening device, 6 ... Press device, 7 ... Gluing device, 8 ... Folding device, 9 ... Folding device, 9a, 9b ... Flap piece folding on the front side / back side Device: 10: Conveying device, 11: Press device, 12: Delivery device, 15: Drive motor, 16: Conveyor chain, 17a, 17b: Press roll, 18: Upper body shaft, 19: Lower body, 20: Diagonal blade, 21 ... Receiving surface, 22 ... Bottom folding bar blade receiver, 23 ... Bottom folding bar blade receiver, 24 ... Bottom folding bar blade receiving surface, 25 ... Rotating shaft, 26 ... Bottom folding bar blade, 27 ... Adjustment bolt 28 ... Nut, 31 ... Bottom folding drum, 32 ... Rotating shaft, 33 ... Pressing Disc: 33a ... Bracket disc, 34 ... Arc plate, 35 ... Vacuum cup, 36 ... Front claw, 37 ... Claw shaft, 38 ... Arm, 39 ... Tip contact, 40 ... Turning contact, 41 ... Axial cam, 42... Rotating direction cam, 42a and 42b... First and second opening cams, 43... Boss member, 44. 50: Rotating direction cam, 51 ... Back side open claw, 52 ... Notch, 53 ... Clamping member, 54a, 54b, 54c ... Air intake hole, 55 ... Movable claw, 56 ... Capturing claw, 57 ... Back presser claw, 58 ... Back raising claw, 60 ... Guide plate, 61 ... Center guide, 62 ... Side guide, 63 ... Side edge guide, 64 ... Center edge guide, 65 ... Side press plate, 66 ... Center press roller, 66a ... Arm, 66b ... Mounting rod, 67 ... press roller, 68 ... bracket, 69 ... spindle, 69a, 69b ... end member, 69c ... intermediate member, 70 ... connecting rod, 71 ... bracket, 72 ... coupling, 75 ... tank, 76 ... gluing pad, 77 ... Gluing roller, 78 ... Relay roller, 81 ... Supporting bracket, 82, 83 ... Movable shaft, 82a, 83a ... Arm, 84, 85 ... Turning direction contact, 86, 87 ... Axial contact, 88, 89 ... Axial cam, 90, 91 ... Rotating direction cam, 95a, 95b ... Push blade, 97 ... Rotating shaft, 97a, 97b, 97c ... Rotating shaft, 98a, 98b, 98c ... Sprocket, 99a, 99b ... Chain, 100, DESCRIPTION OF SYMBOLS 111 ... 1st, 2nd flap piece folding roll, 101 ... Drive shaft, 102 ... Transmission device, 102a ... Intermediate shaft, 103, 104 ... Elliptical gear, 105 ... Same Adjusting device 106 ... sun gear 107 ... planet gear 108 ... ring gear 109 ... driven gear 110 ... worm device 112 ... conveying belt 113 113reverse drum 114a, 114b ... feeding roll 115 ... guide roll 116 ... sandwich belt, 117, 118 ... roll, 119 ... transport belt, 120 ... delivery drum, 121 ... feed roll, 122 ... stacking section, 123a, 123b ... barb, 124a, 124b ... spindle, 125a, 125b ... Contact for rotation, 126a, 126b... Arm, 127a, 127b.

Claims (8)

  A paper tube supply device for supplying a paper tube having a gusset portion that is folded in two and bonded together and M-shaped inwardly on both sides thereof, and for forming a square bottom at one end of the paper tube in the conveying direction And a first bottom opening that opens one end of the paper tube along the folding line in the front-back direction of the paper tube while the paper tube moves along the bottom folding drum that rotates. The apparatus, a second bottom opening device that pushes the portion opened in the vertical direction into the front and back side flaps along the folding line, and presses each flap opened in a flap shape to make it flat Press device, gluing device that applies glue to a predetermined part of the opened flap, folding device that folds the flap piece on the front side of each flap on the front side and back side, and folding that folds both flap pieces inward Conveying and discharging the device and the paper tube with the flaps folded The folding crease device includes a bottom crease means for attaching a bottom crease and a bottom crease for forming the bottom of the paper tube, and a bottom crease. A bag making machine for square-bottom bags, characterized in that a flap piece folding means for attaching diagonal folding lines as folding lines for the front and back side flap pieces is provided on both sides of the front end of the paper tube.   A paper tube supply device for supplying a paper tube having a gusset portion that is folded in two and bonded together and M-shaped inwardly on both sides thereof, and for forming a square bottom at one end of the paper tube in the conveying direction And a first bottom opening that opens one end of the paper tube along the folding line in the front-back direction of the paper tube while the paper tube moves along the bottom folding drum that rotates. The apparatus, a second bottom opening device that pushes the portion opened in the vertical direction into the front and back side flaps along the folding line, and presses each flap opened in a flap shape to make it flat Press device, gluing device that applies glue to a predetermined part of the opened flap, folding device that folds the flap piece on the front side of each flap on the front side and back side, and folding that folds both flap pieces inward Conveying and discharging the device and the paper tube with the flaps folded And a flap piece on the back side of the paper cylinder, and a position facing a back side opening claw that presses a gusset edge on the back side of the paper cylinder of the first bottom opening device unit. A plurality of air intake holes are provided in a row in the axial direction at positions opposite to the back surface on the front end side from the bottom folding line, and further, the position facing the back side of the central portion in the width direction of the front end portion of the flap piece on the back side A plurality of air intake holes are provided in a row in the direction of rotation of the bottom folding drum.   A paper tube supply device for supplying a paper tube having a gusset portion that is folded in two and bonded together and M-shaped inwardly on both sides thereof, and for forming a square bottom at one end of the paper tube in the conveying direction And a first bottom opening that opens one end of the paper tube along the folding line in the front-back direction of the paper tube while the paper tube moves along the bottom folding drum that rotates. The apparatus, a second bottom opening device that pushes the portion opened in the vertical direction into the front and back side flaps along the folding line, and presses each flap opened in a flap shape to make it flat Press device, gluing device that applies glue to a predetermined part of the opened flap, folding device that folds the flap piece on the front side of each flap on the front side and back side, and folding that folds both flap pieces inward Conveying and discharging the device and the paper tube with the flaps folded The second bottom opening device is in contact with the side guide that guides both sides of the front end portion of the paper tube opened by the first bottom opening device, and the widthwise central portion. A center guide that folds along the bottom folding line, a center press roller that is located downstream of the center guide and presses the center of the paper tube, and a width direction of both flaps that is located downstream of the center press roller A center edge guide that guides the opposite ends of the paper, a side edge guide that is located on both sides of the center guide and contacts the top surfaces of both sides of the paper cylinder in the width direction, and both sides of the paper edge in the width direction that are located on both sides of the side edge guide A bag making machine for square-bottom bags, comprising a side press plate pressed on the upper surface of the bag.   A paper tube supply device for supplying a paper tube having a gusset portion that is folded in two and bonded together and M-shaped inwardly on both sides thereof, and for forming a square bottom at one end of the paper tube in the conveying direction And a first bottom opening that opens one end of the paper tube along the folding line in the front-back direction of the paper tube while the paper tube moves along the bottom folding drum that rotates. The apparatus, a second bottom opening device that pushes the portion opened in the vertical direction into the front and back side flaps along the folding line, and presses each flap opened in a flap shape to make it flat Press device, gluing device that applies glue to a predetermined part of the opened flap, folding device that folds the flap piece on the front side of each flap on the front side and back side, and folding that folds both flap pieces inward Conveying and discharging the device and the paper tube with the flaps folded A front side flap piece folding device that folds the flap piece on the front side of the flap on the front side of the paper tube inward, and a back side flap that folds the flap piece on the front side of the flap on the back side. The flap piece is moved to the front side flap piece folding device from the rear side of the front side of the paper tube while passing over the bottom folding drum at a speed faster than the movement of the paper tube. A bag making machine for square-bottom bags, characterized in that a flap piece folding roll that folds the bag into the inside is used.   A paper tube supply device for supplying a paper tube having a gusset portion that is folded in two and bonded together and M-shaped inwardly on both sides thereof, and for forming a square bottom at one end of the paper tube in the conveying direction And a first bottom opening that opens one end of the paper tube along the folding line in the front-back direction of the paper tube while the paper tube moves along the bottom folding drum that rotates. The apparatus, a second bottom opening device that pushes the portion opened in the vertical direction into the front and back side flaps along the folding line, and presses each flap opened in a flap shape to make it flat Press device, gluing device that applies glue to a predetermined part of the opened flap, folding device that folds the flap piece on the front side of each flap on the front side and back side, and folding that folds both flap pieces inward Conveying and discharging the device and the paper tube with the flaps folded A front side flap piece folding device that folds the flap piece on the front side of the flap on the front side of the paper tube inward, and a back side flap that folds the flap piece on the front side of the flap on the back side. It is composed of a single folding device, and the back side flap piece folding device is rotated in the opposite direction to the bottom folding drum and rolled to the flap piece on the back side of the paper tube moving along the rotation of the bottom folding drum. A bag making machine for square-bottom bags, wherein a flap piece folding roll for folding a piece inward is used.   The pressing device is rotatably supported by a pair of left and right brackets, an end member connected to the drive device on one side, and detachable via a coupling between the both end members, and coaxial. 6. The square bottom bag according to claim 1, comprising: an intermediate shaft disposed on the intermediate shaft; and a plurality of rollers fixed to the intermediate shaft so as to be movable in an axial direction. Bag making machine.   A pair of press rolls whose surfaces are made of rubber or metal are provided in the transport device, and the folded bottom is formed in a smooth shape by passing a paper tube between the press rolls. A bag making machine for a square bottom bag according to any one of claims 1 to 6. A delivery drum is provided in the downstream part of the transport device, and a gripping claw that feeds the stacking part over the corner of the corner of the paper tube transported by the transport device is provided in the delivery drum around the delivery drum. The square bottom bag making machine according to any one of claims 1 to 7, wherein the bag making machine is provided so as to be opened and closed by a provided cam mechanism.

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