JP4846500B2 - Paper cylinder forming device in square bottom bag making machine - Google Patents

Description

  The present invention relates to a square bottom bag making machine for continuously forming a square bottom bag such as a shopping bag, for example, and a paper cylinder forming a paper cylinder having M-shaped gussets on both sides before the square bottom is formed. It relates to the device.

  In this type of paper tube forming apparatus, a sheet feeding unit that feeds bag sheets one by one from a sheet feeding unit, and a folded sheet that is folded and formed on a bag sheet fed from the sheet feeding unit as a square bottom bag. It comprises a creasing portion for scoring and a paper tube forming portion that folds and forms the crouched bag paper into a cylindrical shape having M-shaped gussets on both sides, and on the downstream side of the paper tube forming portion A square base forming device is provided that opens and forms one end of the paper cylinder formed in the paper cylinder forming unit in a square base shape.

  As an example of a square bottom bag to be produced by the square bottom bag making machine, there is a square bottom bag W used as a shopping bag as shown in FIG. The square bottom bag W has a gusset portion m on both sides thereof, a square bottom portion n on a lower end portion, and a folded portion o on an upper end portion.

  And when making such a square bottom bag W, a crease is made to a bag paper by the said creasing part in the position used as the crease | fold. FIG. 23 (a) shows a conventional bag paper a with the crease. Each fold line is indicated by a dotted line.

In FIG. 23A, L ₁ and L ₁ ′ are gusseted back muscles on both sides in the width direction, and L ₂ , L ₂ ′, L ₃ and L ₃ ′ are the gusseted back muscles L ₁ and L ₁ ′. Inner and outer gusseted streaks located on both sides, L ₄ and L ₄ ′ are folding bars attached only to one side (back side) of the formed paper tube T, and L ₅ is attached over the entire width of the bag paper a. folded muscle, L ₆ is a mouth folding muscle attached over the whole width in the position where the mouth folding portion.

Then, the bag paper a thus creased is first formed at the paper tube forming portion as shown in FIG. 23B, and the inner gusseted muscles L ₂ and L ₂ ′ and the gusseted back muscles L ₁ and L _1. 'Is folded in a Z shape, and then, as shown in FIG. 23 (c), along the outer gusseted muscles L ₃ and L ₃ ', the front side allowance and the other side folded portion are folded inward. The paper tube T is folded and formed by adhering the edge to which the glue b ₁ is applied in advance to the front end of the bi-fold portion to the pasting margin.

Thereafter, as shown in FIG. 23D, the paper tube T is folded upward along the folding lines L ₄ and L ₄ ′ of the upper bag body as shown in FIG. 23 (d), so that the upper and lower flaps F ₁ and F _2, and after applying glue b ₂ on the inside of the upper and lower flaps F ₁ and F ₂ , as shown in FIG. 23 (e), both flaps F ₁ and F ₁ along the folding lines L ₅ and L ₅ ′. bonded by folding the F _2.

The square bottom bag W shown in FIG. 20 is formed by the process as described above. At this time, the folding bars L ₄ , L ₄ ′ are attached only to one surface of the paper tube T and not to the other surface, so that the folding bag L ₄ , L is placed in the square bottom bag W as shown in FIG. ₄ 'remains only on one side and no streak remains on the other side.

For example, Patent Document 1 discloses a square bottom bag making machine that makes a square bottom bag W from a paper tube T as described above. The paper tube forming part of the paper tube forming apparatus in the conventional square bottom bag making machine shown here is adapted to transport the bag paper a transported from the creasing section with a roller conveyor. In addition, a pair of upper and lower feed belts are provided over the entire length of the conveyance surface by the roller conveyor at the left and right fold-folded portions, and the bags are conveyed by the roller conveyor by the pair of upper and lower feed belts. The paper a is sandwiched from above and below, and the posture during conveyance is set.
Japanese Patent Application Laid-Open No. 11-91004

  The pair of upper and lower feed belts provided to set the posture of the bag paper being conveyed in the conventional paper tube forming unit described above, in particular, the upper feed belt of the upper and lower feed belts Since it is arranged between the left and right gussets over the entire length of the gusset, the minimum gap between the gussets that are folded is regulated by the width of the upper feed belt and cannot be made narrower than this. It was.

  For this reason, it was impossible to make a paper tube of a narrow size as a whole with the facing distance between the inner tips of both gussets being about 30 mm or less.

  In addition, since the bag paper conveying means in the paper tube forming unit of the conventional paper tube forming apparatus is a roller conveyor and upper and lower feed belts, the bag paper in this paper tube forming unit is subjected to a load caused by frictional contact with the folding member. As a result, the feeding posture of the paper tube is easily shifted, and the accuracy of forming the paper tube by folding is poor.

  Further, in the creasing section of the conventional paper tube forming apparatus, the corner crease is provided on the bag paper a in the state of a sheet as shown in FIG. 23 (a). For gusset folds is the direction in which the bag paper is conveyed, and the crease for the bottom corners is attached in a direction perpendicular to the direction of conveyance of the bag paper.

At this time, there is no problem as a folding line for gusset folding, but when the folding line for the bottom of the corner is only in the width direction as the bottom bag, in the forming process at the bottom forming part, FIG. In many cases, the diagonally open sides c of the flaps F ₁ and F ₂ shown in (d) are not smoothly formed, and wrinkles are generated in this portion, so that they are not folded properly.

  In addition, the paper feeding unit in the conventional paper tube forming apparatus feeds the bag paper that is generally distributed one by one, and the maximum width of the bag paper is limited as a square bottom bag making machine. In addition, a square-bottom bag having a width larger than that of the square-bottom bag made using the maximum-width paper that is generally distributed cannot be made.

The present invention has been made in view of the foregoing, a broad leaf paper width than the sheet present in the general circulation path can be used as a bag sheet and the bag sheet in the paper tube forming section, It can be transported without pressing from the upper side, and at least the upper transport belt at the part where the gusset part is folded in a Z shape can be omitted, so that the opposing distance between the inner tips of both gussets can be narrowed, and a paper tube of a narrow size as a whole is made. In addition, it is possible to easily form a corner base in the corner base forming device by attaching a crease in the diagonally open side when the corner base is formed in the corner base forming device. In addition, it is possible to supply two sheets of paper continuously from the paper feeding unit, and to supply a wider paper than a standard product that is generally available. It is conveyed while being folded at It is an object to provide a paper tube forming apparatus in a bag paper corner bottom bag bag-making machine which is to be able to parallel conveyance without collapsing its attitude.

In order to achieve the above object, a paper tube forming apparatus in a square bottom bag making machine according to a first aspect of the present invention includes a paper feed unit that supplies bag paper one by one, and the bag paper is folded as a square bottom bag. A cylindrical paper tube comprising: a creasing portion for forming a crease for forming; and a paper tube forming portion for folding the folded folded bag paper into a cylindrical shape having M-shaped gussets on both sides thereof. in the bottom paper tube forming apparatus in the corner bottom bag bag-making machine to form the corner bottom shape in the corner bottom forming apparatus along muscle fold above the, the paper feed unit, two sheets of sheet width provided the following means attached splicing laminated direction, the paper tube forming section, a first forming unit for folding the both sides of the gusset portion to the Z shape, and outside the outer become bonded length and the other gusset portion of one of the gusset portion Press the second forming part that folds the folded part inward and the overlapping part of the pasting part and the folded part. Consists of a third forming part that adheres to the part with pre-applied glue. The transport surface over the entire length in the transport direction of this paper tube forming part is the vacuum transport surface, and the bag paper supplied from the creasing part is negatively pressured. It is configured to convey in a sucked state.

  According to a second aspect of the present invention, in the above-described apparatus, the transport surface over the entire length in the transport direction of the paper tube forming unit is configured by a transport belt arranged in a plurality of rows in the width direction. A hole is provided, and a vacuum chamber communicating with the suction hole in this part is provided on the back side of the part that becomes the conveying surface of the conveying belt.

  According to a third aspect of the present invention, in the above apparatus, the upper conveying belt device comprising a belt having a conveying surface that travels in the conveying direction along the vacuum conveying surface is provided in the width direction of the second forming portion of the paper tube forming portion. The width direction on both sides and the position of pressing the fold-back folded portion of the gusseted bag paper conveyed through the second forming portion, and the top surface of the half-folded folded portion of the third forming portion Provided at the position where the portion deviated from the center is pressed, each upper transport belt device can be moved in the height direction and the width direction, and the transport speed can be adjusted.

  According to a fourth aspect of the present invention, there is provided a paper tube width restriction that guides the side edges of the folded portions on both sides in the width direction of the bag paper folded inward by the second forming portion on both sides in the width direction of the second forming portion. Set up a section.

  According to a fifth aspect of the present invention, there is provided a crease for attaching a crease for forming a folded sheet as a square bottom bag on the bag paper fed from the paper feed unit of the apparatus. In addition to the gusseted muscles, the fold-folded muscles, the folding muscles, and the folding muscles on both sides of the gusseted back muscles, gusseted diagonal muscles that serve as the folding lines of the diagonally open sides of the flaps during the formation of the corner base were added.

Further, the invention according to claim 6 is provided symmetrically with a gusset folding device that folds the gusset portion on the front side and the far side of the bag paper in a Z shape on both sides in the width direction of the first forming portion of the paper tube forming portion. Each fold device pushes the back side of the gusset back of the gusset fold of the bag paper inward to form the gusset back, and a spatula that guides the gusset fold of the bag paper up to this fold plate the plate is provided, at the tip of the spatula, the peripheral surface has become a structure in which a rotating disc in contact with the back side of the part folded gusset, further, the invention of claim 7, the gusset folding device The foldable plate is configured to be movable in a symmetric direction with respect to the foldable device.

In the present invention described above, in the invention according to claim 1, the bag paper in which two normal sheets are joined from the paper supply unit can be supplied to the paper tube forming unit, thereby existing in the general distribution path. It is possible to form a paper tube using a wide sheet other than the sheet to be made, thereby making it possible to produce a wide-sized square bottom bag.
In the invention according to claim 1, the bag paper conveyed through the paper tube forming portion is conveyed in a state of being sucked by the negative pressure on the vacuum conveyance surface, so that the bag paper of this portion is conveyed to the vacuum conveyance surface. Can be transported only by

  Therefore, in the first forming portion in which the bag paper is conveyed at least in a sheet state and the gusset portions on both sides in the width direction are folded and formed in a Z shape, the bag paper is particularly pressed from the upper side by the conveyance belt or the conveyance roller. There is no need, and the upper side of the sheet can be made spatial.

  From this, the opposing distance between the gusset back tips of the gussets on both sides that are folded in the Z shape in this first forming portion can be freely narrowed, for example, the gusset between 85 mm or less to 10 mm between the gusset back tips A narrow paper tube between the back ends can be formed.

  Further, in the invention according to claim 2, since the vacuum conveying surface is configured by a conveying belt that performs a suction action, the configuration of the vacuum conveying surface is mechanically easily configured over the entire length of the paper tube forming portion. In addition, the suction force can be obtained uniformly over the entire length of the conveying surface.

  Further, in the invention according to claim 3, the leading end portions of the gusset folding portions on both sides of the bag paper which has been folded into the Z shape at the first forming portion and conveyed to the second forming portion are formed in the second formation. Since the bag sheet can be conveyed while being pressed by the upper conveying belt device at the section, the gusset back sides of the gusset parts on both sides can be securely folded without any gaps between the gussets.

  Further, in the present invention, the upper conveying belt device presses both sides in the width direction of the second forming portion and the upper surface of the bi-folded portion of the third forming portion that is folded in two, and is shifted from the center in the width direction. When the transport posture of the bag paper transported on the vacuum transport surface is distorted in the second and third forming portions by being transportable, the belt traveling speed of each transport belt device is adjusted to adjust the belt travel speed. The posture of the bag paper at the portion can be corrected to the correct posture.

  Further, in the invention according to claim 4, since both sides in the width direction of the bag paper at the time of the folding process in the gusset portions on both sides in the second forming portion can be guided and run by the paper tube width regulating member, the bag in the middle of folding The posture of the paper can be kept parallel to the traveling direction, and the paper tube can be formed without being tapered or bent.

  Moreover, in the invention which concerns on Claim 5, by attaching the gusset part diagonal stripe | line which becomes a crease | fold of the diagonally open side of the flap at the time of a square base formation in a creasing part, the paper cylinder formation apparatus which concerns on this invention is added. When forming the square bottom by opening the bottom of the paper cylinder formed by the square bottom forming device, the flap can be smoothly formed without wrinkles.

In the invention according to claim 6 , in the first forming portion, the back side of the gusset back portion of the gusset that is gusseted by the gusset folding plate is pushed inward by the rotating disk provided at the tip of the spatula plate. Thus, folding of the back of the gusset can be performed with a small resistance, and folding of this portion can be smoothly performed. In the invention according to claim 7 , by making the foldable plate movable in a symmetric direction with respect to the foldable device, the folding width at the back of the gusset can be freely changed with respect to the width of the paper tube. It is possible to form paper tubes having different gusset widths.

  FIG. 1 schematically shows a square bottom bag making machine provided with a paper tube forming apparatus 2 according to the present invention disposed upstream of a square bottom forming apparatus 1.

  The paper tube forming apparatus 2 includes a paper feed unit 4 that supplies sheet-like bag paper 3 one by one, and a folding line for forming a paper tube on the bag paper 3 fed from the paper feed unit 4. The creasing section 5 includes a creasing section 5 and a paper tube forming section 6 that folds and forms the bag paper 3 creased by the creasing section 5 into a tubular shape.

  The sheet feeding unit 4 is configured as shown in FIGS. 2 and 3, and the two sheets 3a and 3b are bonded in the width direction so as to have a width corresponding to approximately two sheets of the sheets 3a and 3b. Paper is fed as bag paper 3.

  The paper feed unit 4 feeds two sheets of paper in parallel with a gap between them, and the two sheets fed from the paper feeder in the width direction. And a laminating and conveying apparatus that feeds the sheet to the sheet processing apparatus as a two-sheet wide sheet.

  The laminating and conveying apparatus has first and second conveying paths for conveying each sheet fed from the sheet feeder, and one of the conveying paths is conveyed along this conveying path. A width-shifting mechanism that allows the sheet to be shifted toward the other conveyance path while the other conveyance path is moving the inner end of the sheet while the conveyance path is being conveyed. And a height changing mechanism that gradually changes the height with respect to the inner edge of the sheet.

  In addition, a glue applying device for applying glue to the inner end portion (glue margin) of the lower sheet while being conveyed by the conveying device is provided at the upstream portion of the bonding and conveying device. Further, on the downstream side of the laminating and conveying apparatus, a press roller device is provided that presses a portion that is overlapped by the width adjusting mechanism and the height changing mechanism of the apparatus and on which the glue is applied by the glue applying apparatus. .

  FIGS. 2 and 3 show an embodiment of the paper feeding unit 4. In the figure, 8 is a paper feeding machine, and 9 is a bonding and conveying apparatus disposed between the paper feeding machine 8 and the creasing part 5. FIG. It is.

  The paper feeder 8 is a known device of a double feed system, and each of the first and second sheets 3a and 3b stacked in parallel on the stacker 7 is placed in parallel with a gap between them. Paper is fed to the bonding conveyance device 9. A first stopper 10a is provided at the downstream end of the paper feeder 8 so that the first stopper 10a can protrude and retract, and the leading ends of both sheets 3a and 3b fed from the paper feeder 8 are the first stopper 10a. It comes to be aligned by hitting. This first stopper is of a known mechanism, and moves in and out in synchronism with the paper feeding operation of the paper feeder 8 by cam operation or cylinder operation.

  The laminating and conveying device 9 is provided from first and second conveying paths 11 and 12 arranged in parallel so as to convey the first and second sheets 3a and 3b fed from the paper feeder 8. The two conveyance paths 11 and 12 are synchronously operated to synchronously convey the two sheets 3a and 3b fed from the paper feeder 8.

  And the height which changes the position of the glue margin part of the sheet 3a conveyed in this 1st conveyance path 11 to the 1st conveyance path 11 of one side (OS side) of the bonding conveyance apparatus 9 to a height direction. A change mechanism is provided. That is, in order from the upstream side of the first transport path 11, the first horizontal feed portion 11a, the downward feed portion 11b that is slightly inclined downward, the second horizontal feed portion 11c that is horizontal from the downward feed portion 11b, The ascending feed portion 11d is inclined upward from the second horizontal feed portion 11c, and the third horizontal feed portion 11e is provided horizontally from the ascending feed portion 11d. The first and third horizontal feed portions 11a and 11e are in the same horizontal plane, and the height changing mechanism is formed by the lower feed portion 11b, the second horizontal feed portion 11c, and the ascending feed portion 11d in the middle stream portion. The height of the sheet 3a is changed so as to be lower than the height of the sheet 3b conveyed on the other conveying path 12 while passing through the sheet. Each of the feeding portions 11a to 11d is configured by a plurality of transport belts 13 that can be driven.

  A guide plate 14 for setting the position in the width direction of the first sheet 3a at this position is provided at the inner end in the width direction of the third horizontal feeding portion 11e. The phrase “horizontal” in the first, second, and third horizontal feeding portions 11a, 11c, and 11e means the same surface as the feeding direction of the bonding and conveying device 9, and the bonding and conveying device 9 For example, when the downstream side is inclined so as to be lowered, the feeding surfaces of the feeding portions 11a, 11c, and 11e are inclined parallel to the feeding surface. In the first transport path 11, a feed roller 13 a is in contact with the upper side of each of the transport belts 13.

  The transport surface of the second transport path 12 on the other side (GS side) of the bonding transport device 9 is the same surface from the start end to the end thereof, and the start end and the end thereof are the first transport path. 11 is flush with the start and end. Then, the sheet 3b conveyed on the second conveyance path 12 is bonded to the second conveyance path 12, and the two sheets 3a and 3b are bonded to the one conveyance path 11 side according to the conveyance operation. For this reason, there is provided a width adjusting mechanism that adjusts the amount corresponding to the adhesive allowance.

  That is, in the upstream side portion of the second transport path 12, the plurality of transport belts 15, 15 provided in parallel from the upstream side to the downstream side are disposed so as to be inclined so that the downstream side approaches the first transport path 11. Thus, the sheet 3b conveyed through the second conveyance path 12 is shifted toward the first conveyance path 11 in accordance with the inclination of the conveyance belt 15 at the upstream portion thereof.

  A pressing guide 16 is provided on the upper side of one of the inclined conveyor belts 15 and supported by a support mechanism (not shown) in parallel with the conveyor belt 15. The press guide machine 16 is configured to be in contact with the conveyor belt 15 by exposing a large number of balls 18 over the entire length of the rod-shaped machine frame 17 and exposing a part of the balls 18 downward.

  The downstream side of the width adjusting mechanism part of the second transport path 12 is a part from the descending feed part 11b to the second horizontal feed part 11c of the first transport path 11, that is, a part where the first sheet 3a is lowered. It corresponds to. Further, a guide plate 19 is provided so that the side edge of the sheet 3b that has been brought into contact with the side edge of this portion is in contact with the first conveyance path 11 on the downstream side. .

  The downstream side of the width adjusting mechanism portion of the second transport path 12 is a transport path for transporting the sheet 3b in parallel by another transport belt provided in parallel with the transport direction.

  At the downstream end of the laminating and conveying apparatus 9, a second stopper 10b is provided so as to be able to appear and retract, where the leading ends of both sheets 3a and 3b conveyed on both conveying paths 11 and 12 abut.

  In the upstream portion of the laminating and conveying apparatus 9, there is provided a glue applying device 20 that applies glue 20a to an inner end portion which is a glue margin portion of the first sheet 3a. In addition, an intermediate conveyance path 21 for feeding the bag paper 3 bonded by the bonding conveyance device 9 to the creasing section 5 is provided on the downstream side of the bonding conveyance device 9. A press roller device 22 is provided opposite the surrogate.

  Next, the operation of the bonding and conveying apparatus 9 will be described.

  The first and second sheets 3a and 3b are fed one by one from the paper feeder 8 toward the bonding and conveying device 9 at the same time. At this time, the first stopper 10a is operated and the sheets 3a and 3b are fed in parallel after the leading ends are aligned.

  The first sheet 3a on the front side is in the first conveyance path 11 of the bonding conveyance device 9, and the second sheet 3b on the back side is the second conveyance sheet 9 in the bonding conveyance device 9. In the conveyance path 12, it conveys until the front-end | tip collides with the 2nd stopper 10b provided in the terminal part of this bonding conveyance apparatus 9, respectively.

  At this time, the first sheet 3a transported through the first transport path 11 is transported in parallel by the feeding sections 11a to 11e of the first transport path 11, and this second horizontal feed is performed. In the part 11c, it becomes lower than the first and third horizontal parts 11a, 11e, and therefore lower than the conveying surface of the second conveying path 12.

  The first sheet 3a conveyed on the first conveyance path 11 is glued on the glue application device 20 provided on the upstream side of the first conveyance path 11 as an inner margin of the glue margin. The paste 20a is applied in a linear form.

  On the other hand, the second sheet 3b transported on the second transport path 12 is guided to the first transport path 11 side by the width adjusting mechanism while being transported on the second transport path 12. Until it comes into contact, and then is conveyed along the guide plate 19, and the tip is brought into contact with the second stopper 10b and stopped.

  At this time, both the transport paths 11 and 12 are operated synchronously, and both the sheets 3a and 3b are transported at substantially the same speed, and each contact with the second stopper 10b and positioning in the transport direction is performed substantially simultaneously.

  And while both sheets 3a and 3b are conveyed by both these conveyance paths 11 and 12, the downstream part of the width-adjusting mechanism of the 2nd conveyance path 12 is the 2nd horizontal feed of the 1st conveyance path 11. Since it corresponds to the portion 11c, that is, the portion that is lower than the conveyance surface of the second conveyance path 12, the inner edge of the second sheet 3b that is width-shifted inward by the width-shifting mechanism is In the inner end portion of the first sheet 3a being conveyed through the first conveyance path 11, the overlapping state is established by separating the upper part of the adhesive margin.

  In this state, the two sheets 3a and 3b are conveyed in parallel by the two conveying paths 11 and 12, but the first sheet 3a is sent by the ascending feed section 11d of the first conveying path 11. The sheet 3a is moved up to the conveying surface of the second conveying path 12, and the third horizontal feeding portion 11e is positioned in the feeding direction with the respective leading ends thereof in contact with the second stopper 10b. , 3b are overlapped with no gap between them.

  After that, both sheets 3a and 3b are sent out to the intermediate conveyance path 21 by the immersion of the second stopper 10b, and the overlapping portion is bonded by the press roller device 22 at this portion, and the two-width bag paper 3 and Then, it is conveyed to the creasing section 5.

  The scoring unit 5 is configured as shown in FIGS. 4 and 5, and the bag paper 3 conveyed from the paper supply unit 4 is conveyed downstream by the roller conveyor 23. From the upstream side of this, the crease portion 5 has a gusset crease roller portion 24, a folding crease roller portion 25, a gusset portion oblique crease roller portion 26, a folded crease roller portion 27, and a broken crease roller portion 28. And have. Moreover, the press part 29 and the paste application | coating apparatus 30 are provided in the most downstream part of this.

  In the above roller portions, the other roller portions excluding the gusset portion oblique creasing roller portion 26 are substantially the same as the configuration of the scoring roller portion for attaching each streak of the conventional bag paper a shown in FIG. Yes. The gusset creasing roller section 24 includes gusset back crease roller pairs 24a and 24a 'on both sides in the width direction, inner gusset scoring roller pairs 24b and 24b' on both sides in the width direction, and roller pairs 24c and 24c 'on the outer gusset lines. ing. The folding creasing roller section 25 has a folding creasing roller pair 25a, and the folding creasing roller 27 has a folding creasing roller pair 27a on the near side and a folding creasing roller pair 27b on the far side. The broken crease roller section 28 is composed of a broken crease roller pair 28a.

As shown in FIG. 5, the gusseted diagonally streaked roller section 26 has apexes at the intersections between the gusseted back muscles L ₁ , L ₁ ′ on both sides shown in FIG. 21 and the folding bars L ₄ , L ₄ ′. _Inclined gusset rollers for attaching gusseted diagonal stripes L _7e having apexes at the ends of the folds of diagonal folds L _7a , L _7b , L _7c , L _7d , and folding lines L ₅ at both lower sides A pair 26a, 26b, 26c, 26d, and 26e.

Of these gore oblique knurling rollers 26a to 26e, one diagonal streaks _{L 7a,} L _7c, put _{L 7e} rollers 26a, 26c, 26e and the other oblique muscle _L 7b, L _The roller pairs 26b and 26d to which _7d are attached are provided with their phases shifted from the axes 26f and 26g whose positions are shifted in the transport direction. These roller pairs may be provided on the same shaft. The rotation phases of the shafts 26f and 26g are shifted so that the stripes in both directions are at the same position.

The gusseted diagonal stripes L _{7a to} L _7e attached by the gusseted diagonally creased roller pairs 26a to 26e serve as folds of the diagonally open sides of the flap when the square base is formed by the square base forming apparatus 1. .

Each line of the bag paper 3 to be crooked by the creasing section 5 of the present invention shown in FIG. 21 becomes a mountain crease and a valley crease according to the folding direction when it becomes a paper tube. , Gusset back muscles L ₁ , L ₁ ′ and gusset part oblique muscles L _{7 a to} L _{7 e} are mountain folds, and left and right inner and outer gusseted muscles L ₂ , L ₂ ′, L ₃ , L ₃ ′, folding muscles L ₅ , the cut muscle L ₆ and the folding line are valley folds. And in each of the roller pairs shown in FIG. 5 used for the creasing, the blades of each roller are dotted lines for the mountain folds where the lower roller has a convex blade, and the solid lines are It is for valley folding with a convex blade on the upper roller. Both the roller pairs 27a and 27b of the folding-reinforcing roller pair 27 can be aligned in the axial direction, and the interval in the width direction of the lines can be changed. The other roller pairs are also fixed so as to be movable in the axial direction so that they can be aligned in the axial direction. In each roller pair, the convex blade is made of steel, but the receiving blade is made of rubber.

Thus, in this creasing portion 5, the gusseted back muscles L ₁ , L ₁ ′ on both sides and the inner and outer gusseted muscles L ₂ , L ₂ ′, L _{3 in} each roller pair of the gusset creasing roller portion 24, respectively. , L ₃ ′, the fold line L ₅ is formed by the fold line roller section 25, and the gusset section diagonal lines L _{7 a to} L _{7 e} are the fold line roller section 27. The folding lines L ₄ and L ₄ ′ are attached to the folding line L ₆ as shown in FIG. At this time, in each roller pair, it was possible to attach a streak that easily breaks because the receiving blade is a rubber material with respect to the convex blade made of steel.

  The bag paper 3 creased by the crease unit 5 as described above is pressed by the press unit 29 and supplied to the paper tube forming unit 6 provided on the downstream side while being flattened. Then, at the downstream end portion of the creasing portion 5, the paste 30 a is applied to the opposite end portion of the bag paper 3 by the paste applying device 30.

22 (a), (b), (c), (d), and (e) are steps for making a square bottom bag similar to the conventional one shown in FIGS. 23 (a) to (e). FIG. 22 (a) shows the sheet 3 that has been crooked by the creasing portion 5 described above, and the glue 30a is applied to the tip of the two-folded portion on the far side, FIG. 22 (b) The left and right gussets are folded in a Z shape in a first forming part 6a of a paper tube forming part 6 to be described later, FIG. 22 (c) shows the pasting allowance on the near side and the other side in the second forming part 6b. A state in which each of the two folded portions is folded into a paper tube T is shown. FIG. 22 (d) shows a step of opening the paper tube T with a square bottom forming device. At this time, due to the presence of the gusset portion oblique stripes L _{7a to} L _7e , the corners by the square bottom forming device are shown. The opening operation of the bottom is performed smoothly, and the square bottom bag W shown in FIG. 22 (e) is formed without generating wrinkles in this portion.

The paper tube forming part 6 is arranged such that the center between the gusseted back muscles L ₁ and L ₁ ′ on the downstream side of the creasing part 5 and on both sides of the bag paper 3 supplied from the creasing part 5 is the transport center. Are arranged.

  The paper tube forming portion 6 is as shown in FIGS. 6 and 7. As described above, the first forming portion 6a that folds the gusset portions on both sides into a Z shape, and the pasting allowance and the other side. A second forming portion 6b that folds each of the two folded portions inward and a second forming portion 6b that presses and bonds the folded portion with the paste 30a applied to the folded portion to form a paper tube. The part 6c and the press part 6d are arranged in order from the upstream side in the transport direction of the transport device provided over the entire length of the paper tube forming part 6. The transfer surface of this transfer device is a vacuum transfer surface.

  In the paper tube forming portion 6, the first and second forming portions 6a and 6b are not shown in FIGS. 6 and 7, but are arranged above the vacuum conveying surface together with upper conveying belt devices 69a to 69e described later. Supported by the upper component.

  In this embodiment, the vacuum conveyance surface is composed of conveyance belt devices 31a, 31b, 31c, 31d, 31e, and 31f that are divided into a plurality in the conveyance direction. Since these devices are substantially the same, the second conveying belt device 31b on the upstream side will be described with reference to FIGS.

  A plurality of, for example, seven conveyor belts 32, 32,... Are arranged in a portion extending on both sides in the width direction including the conveyance center, and rollers 33a on both sides in the conveyance direction are connected to a driving source. 33b and a tension roller 33c provided below. Timing belts are used for the transport belts 32, and timing rollers having gears with which the timing belts mesh are used for the rollers 33a, 33b, and 33c for guiding the belts. A groove having a predetermined width is formed over the entire length on the inner surface of each conveying belt 32 and in the center in the width direction, and a plurality of suction holes 34 are provided in this portion at a predetermined pitch over the entire length.

  A vacuum chamber 35 is provided below the conveyance operation area of each conveyance belt 32 and between the upstream and downstream guide rollers 33a and 33b. In this embodiment, the vacuum chamber 35 is divided into two in the transport direction, and a vacuum pipe 36 is connected to each vacuum chamber. The upper surface of the vacuum chamber 35 is slidably contacted with a groove on the inner surface of the conveying action region of the conveying belt 32, and is located at a position corresponding to the row of suction holes 34 of the conveying belt 32. In addition, a slit 37 is provided over the entire length, and the suction hole 34 of the transport belt 32 in the transport operation region acts by suction through the slit 37. The vacuum tube 36 is connected to a suction device (not shown).

  The slidable contact portion of the vacuum chamber 35 with the conveyor belt 32 is narrower than the conveyor belt 32, and this portion fits in the groove of the conveyor belt 32 without a gap, and the conveyor belt 32 is in the conveying direction at this portion. The travel to is guided without meandering. In addition, a guide plate 38 that closes a gap between the transport belts is provided between the transport belts 32 on the same plane as the transport belt 32.

  The third to sixth conveyor belt devices 31c, 31d, 31e, 31f on the downstream side of the second conveyor belt device 31b are the same as the above-described second conveyor belt device 31b, but are on the most upstream side. In the first conveyor belt device 31a, the upstream side of the conveyance operation region of the two conveyor belts 32 on both sides of the seven conveyor belts 32 is shortened, and the upstream conveyance portion of the first conveyor belt device 31a is shortened. The transporting action area is narrow. This portion is narrowed so that the tip of the first formation portion 6a, which will be described later, is not interfered with the conveyor belt 32 when it is moved inward in the width direction. Because.

  In addition, a large number of conveying rollers 40 are connected to the drive source on both sides of the first and second conveying belt devices 31a and 31b and on the other side of the third and fourth conveying belt devices 31c and 31d. It is provided so as to rotate in the transport direction. The rollers 40, 40 located on both sides of the vacuum conveying surface are coaxial, and each rotate integrally with a shaft 41.

  The conveyor belts 32 of the conveyor belt devices 31a to 31f described above are driven in synchronism with each other, and their speeds can be adjusted. If possible, the above-described vacuum conveyance surface may be a single conveyance belt device over the entire length of the paper tube forming unit 6. In this embodiment, an example in which seven conveyor belts are used is shown, but a single conveyor belt having a wider width may be used. In this case, the uppermost stream portion is also set to have the same width, and the upstream side end portions of the flip-up plates 44, 44 are positioned so as to contact the upper surface of the transport belt. In this case, a plurality of suction holes are provided, and a vacuum chamber slit is provided below each suction hole array.

  Thus, on the vacuum conveyance surface in the paper tube forming unit 6, the bag paper 3 conveyed after each line is made by the creasing unit 5 acts on the conveyance surface by the vacuum conveyance surface. The sheet is conveyed at the traveling speed of the conveying belt 32 while being adsorbed by a negative pressure.

  Next, the first forming portion 6a in the paper tube forming portion 6 will be described with reference to FIGS. 6, 7, and 11 to 15. FIG.

  As described above, the first forming portion 6a folds the gusset portion on the near side and the far side of the bag paper 3 supplied from the creasing portion 5 into a Z shape, and as shown in FIGS. There are provided gusset folding devices 42a, 42b having a symmetrical structure on the front side and the other side. Since both the gusset folding devices 42a and 42b have a symmetrical structure as described above, the front side will be described.

In the figure, reference numeral 43 denotes an inner pressing plate for pressing the inner side of the gusseted streak L ₂ (L ₂ ′) on the inner side of the bag paper 3 shown in FIG. 21, and this inner pressing plate 43 is a part of the first forming portion 6a. It is provided over the entire length. The upstream end of the inner pressing plate 43 is curved upward so that the bag paper 3 can easily enter. 44 is a flip-up plate that flips the outside of the inner gusset L ₂ (L ₂ ′) upward as the bag paper 3 travels. The top surface of the flip-up plate 44 has a first conveying belt device at the tip. It protrudes downward from the transport surface of 31a, and has a shape that gradually increases from the tip to the upper side of the transport surface.

  A spatula plate 45 is fixed to the downstream end of the flip-up plate 44 so as to be able to rotate inward and slightly inward and inward and outward, and on the downstream side and lower side of the spatula plate 45. A gusset folding plate 46 is provided. The outer portion of the foldable plate 46 is attached to a support plate 47.

  A thin-plate-like rotating disk 48 is supported at a front end portion of the spatula plate 45 by a support shaft 49 provided in a vertical direction so that an inner peripheral edge thereof protrudes inward from an inner edge of the spatula plate 45. It is provided so that it can rotate freely. The spatula plate 45 is set so that the inner peripheral edge of the rotating disk 48 is positioned above the outer edge of the inner pressing plate 43 and slightly inside.

The upstream side of the inner edge of the gusset folding plate 46 is an inclined edge 46a that is inclined from the outside to the inside, and the inner tip of the inclined edge 46a protrudes to the upper side of the inner pressing plate 43. At the edge 46b, the back side of the gusset back muscles L ₁ and L ₁ ′ is pushed inward.

Bending members 52 and 53 for pushing and bending the outer portions of the inner side of the gussets L ₂ and L ₂ ′ inside the bag paper 3 that are splashed up above the splash plate 44 and the spatula plate 45, respectively. It is provided.

A support plate 55 provided on the inner side of the inner pressing plate 43 is an outer pressing plate 54 that presses the outer side of the gusset back muscles L ₁ , L ₁ ′ above the gusset folding plate 46. It is provided in support. The outer pressing plate 54 is gradually lowered from the upstream side toward the downstream side, and at the upstream side, the outer pressing plate 54 has such a height that a portion pushed and bent by the downstream pressing and bending member 53 enters. Then, it is the height which holds down the gusset part folded in Z shape.

  The gusset folding action in the first forming portion 6a will be described with reference to FIGS.

The bag paper 3 that has been supplied to the first forming portion 6a has the inner presser plates 43 and 43 inside the gusseted muscles L ₂ and L ₂ ′ on the inside thereof over the entire length of the first forming portion 6a. It is held and conveyed. During this time, the outer portions of the bag paper 3 outside the gusset lines L ₂ and L ₂ ′ are splashed by the flip-up plates 44 and 44. The splashing portion is pushed and bent outward by the upstream bending members 52 and 53.

Next, the outer side of the gussets L ₂ and L ₂ ′ on the inner side of the bag paper 3 is guided by the spatula plate 45, and is guided by the peripheral edge of the rotary disk 48 provided at the downstream end portion thereof. This portion is smoothly raised and guided toward the gusset folding plate 46 located on the downstream side. The rising portion is pushed and bent outward by the downstream bending member 53, and this portion enters the lower side of the pressing plate 54 (FIG. 13A). In this state, the outer side of the inner gusseted lines L ₂ and L ₂ ′ is pushed and bent along the inclined edge 46 a of the gusset folding plate 46 as the bag paper 3 is moved downstream, and then the outer presser In the state of being pressed by the plate 54, the inner gusset muscles L ₂ and L ₂ 'and the gusset back muscles L ₁ and L are bent inward at the position of the gusset back muscles L ₁ and L ₁ ' at the protruding tip edge 46b. ₁ 'and it is folded in a Z shape (FIG. 13B).

When the bag 3 is further moved, the outer portions of the Z-folded portions of the gusset back muscles L ₁ and L ₁ ′ are pressed by the outer pressing plate 54 (FIG. 13C).

  In each of the gusset folding devices 42a and 42b on the near side and the far side of the first forming portion 6a, the inner pressing plate 43, the flip-up plate 44, and the spatula plate 45 having the rotating disc 48 are suspended from an upper component member (not shown). They are supported by being lowered, and these are integrated and movable in the opposite direction. Further, the fold plate 46 attached to the support plate 47 and the holding plate 54 supported by the support plate 55 are suspended and supported by the upper constituent members in the same manner as described above. Apart from that, it can move in the opposite direction.

  And when changing the width | variety of the paper cylinder which it is going to form, each of both the gusset folding apparatuses 42a and 42b moves to the opposing direction. On the other hand, when changing the gusset width, the gusset folding plate 46 and the pressing plate 54 are moved together in the opposing direction in both gusset folding devices 42a and 42b.

  Next, the second forming portion 6b in the paper tube forming portion 6 shown in FIGS. 6 and 7 will be described with reference to FIGS.

The second forming portion 6b is basically configured in the same manner as the first forming portion 6a, and the gusseted streak L on the outer side of the bag paper 3 folded in the Z shape by the first forming portion 6a. _3, L 3 _'a bonded length and clamshell portion of the outer side the outer gusset muscle L _3, L _3' intended for folding inwardly at cash on folded laminated wrap bonded length of the front device 56a and the secondary It comprises a double-folding part folding device 56b for folding the folded part. In the following, both devices 56a and 56b will be described together.

56c and 56d are both sides of the conveying surface, on the near side folded by the first forming portion 6a and above the Z-shaped folded portion on the far side, and just inside the outer gusseted muscles L ₃ and L ₃ ′. A gusset holding plate for pressing and guiding, both gusset holding plates 56c and 56d are provided from the upstream portion of the second forming portion 6a to the downstream side thereof. The widths of the gusset portion pressing plates 56c and 56d are narrower than the folding width of the gusseted portion that is folded into a Z shape (1/2 of the gusset width), and the width of the gusset portion pressing plates 56a and 56b is reduced. The inner part protrudes to the inner side of the gusset part pressing plates 56c and 56d.

57a and 57b are flip-up plates which are located outside the gusset portion pressing plates 56c and 56d and which flip the outside of the gusseted muscles L ₃ and L ₃ ′ outside the bag paper 3 upward according to the travel of the gusseted portion. The top surface shape of the flip-up plates 57a and 57b is such that the tip is slightly above the transport surface and gradually increases from the tip.

Spatula plates 58a and 58b are fixed to the downstream ends of the flip-up plates 57a and 57b so as to be able to rotate inward and slightly inward and inward and outward, and downstream ends of the spatula plates 58a and 58b. The inner edge is positioned above the outer edge of the gusset pressing plates 56c, 56d, and the spatula plates 58a, 58b are set to rise outside the outer gusseted muscles L ₃ , L ₃ ′. It has become.

  On the downstream side of the spatula plates 58a and 58b, there are provided folding members 59a and 59b that fold back portions raised by the spatula plates 58a and 58b inward. Further, holding plates 60a and 60b are provided below the folded members 59a and 59b so as to press the folded portions from above. Each presser plate 60a, 60a is provided with paper tube width regulating members 60c, 60d at positions facing the outer edges of the gusset portion presser plates 56c, 56d.

  Both the folding members 59a and 59b are eaves-shaped toward the inside. Then, the folding member 59a of the front side folding margin folding device 56a folds the portion of the packaging margin having a narrow width on the front side of the bag paper 3, so that the eaves portion is small but the two-fold folding unit folding device 56b on the far side The eaves portion of the folding member 59b is large in order to fold back the two folded portions on the other side of the bag paper 3. Further, a folding guide member 61 for folding the bifold portion is provided on the upper side of the folding member 59b of the bifold portion folding device 56b toward the oblique downstream side along the traveling direction of the bag paper 3.

  And the pasting margin folding device 56a and the double folding device folding device 56b in the second forming portion 6b are integrated with the operation of the first forming portion 6a in the facing direction of the gusset folding devices 42a and 42b. To move to.

  The folding action in the second forming portion 6b will be described with reference to FIGS.

The bag sheet 3 folded into a Z shape and conveyed to the second forming portion 6b has a gusset portion pressing plate 56c in a state where the inner portion of the gusset portion protrudes to the inner side of the gusset portion pressing plates 56c and 56d. , 56d. Then, the outer sides of the outer gusset muscles L ₃ and L ₃ ′ are springed up by the flip-up plates 57a and 57b. Then, it is raised by the spatula plates 58a and 58b (FIGS. 15A and 16A). As the vehicle travels further, the rising portion is folded inward by the folding members 59a and 59b (FIGS. 15B and 16B). At this time, since the two-folded portion on the other side is wide, it cannot be folded back only by the folding member 59b and is folded by the folding guide member 61.

  Further, at this time, both ends in the width direction of the sheet, whose both sides in the width direction are folded by the both folding devices 56a and 56b of the second forming portion 6b, are guided by the paper tube width regulating members 60c and 60d. 2 It is possible to prevent the sheet 3 to be moved through the forming portion 6b from being tapered or bent.

In this state, the glue 30a is applied at the front side of the outer gusset muscle L ₃ from the width direction leading end of the clamshell portion on the adhesive margin folded back inwardly in the outer advance creasing unit 5 glue applying device 30 The glue margins that have been made are overlaid.

Although not shown, a rotating disk is also provided at the tip of the spatula plates 58a and 58b in the second forming portion 6b in the same manner as the spatula plates 45 and 45 in the first forming portion 6a. The presser plates 56c and 56d may be rotatably provided so as to enter slightly inside the outer edges. In this case, the outer gusset muscles L ₃ and L ₃ ′ raised by the spatula plates 58a and 58b are smoothly guided to the turn-back members 59a and 59b by the rotating discs, and the outer side of the gusset portion. Will wrap smoothly.

  Next, the 3rd formation part 6c in the paper cylinder formation part 6 shown by FIG. 6, FIG. 7 is demonstrated with reference to FIG.

  The third forming portion 6c is configured to press and bond the pasting allowance overlapped by the second forming portion 6b and the adhesive allowance of the two-folded portion from the upper side. In the figure, reference numeral 62 denotes a support frame. The support frame 62 is fixed to the frame 63 on the near side of the paper tube forming apparatus 2 and is cantilevered on the vacuum conveyance surface at a right angle to the conveyance direction. It is supported in the shape. The support frame 62 includes two parallel rail members 64a and 64b and a screw shaft 65 provided in parallel between the rail members 64a and 64b. The saddle 66 is slidably supported on the rail members 64a and 64b of the support frame 62 and is screwed onto the screw shaft 65. By rotating the screw shaft 65 with a handle 67 or the like, the vacuum conveying surface is changed. It moves in a direction that crosses at a right angle.

  A pressing plate 68 elongated in the conveying direction is provided below the saddle 66 so that the position can be adjusted in the vertical direction. The upstream end of the pressing plate 68 is curved upward.

  The protruding length of the support frame 62 onto the vacuum conveying surface is up to the intermediate portion in the width direction of the vacuum conveying surface, and the sliding stroke of the saddle 66 is such that the pressing plate 68 moves from the front side of the vacuum conveying surface to the front side. The range is movable over the position near the center.

  Thus, in the third forming portion 6c, the position of the saddle 66 is set so that the pressing plate 68 supported by the saddle 66 is located above the portion overlapped by the second forming portion 6b, and The height of the pressing plate 68 is adjusted with respect to the saddle 66 so as to be a position where the overlapping portion is pressed.

  In this state, the overlapping portion of the bag paper 3 conveyed from the second forming portion 6b is pressed while being moved along the lower surface of the pressing plate 68, and is adhered by the glue applied to the tip of the folded portion. Thus, the paper tube T is formed.

  As shown in FIGS. 6 and 18, on the upper side of the paper tube forming portion 6, the central portion in the width direction of the vacuum conveying surface of the first forming portion 6a and upstream of the folding members 59a and 59b of the second forming portion 6b. Upper conveying belt devices 69a, 69b, on both sides in the width direction on the side, on the downstream side of the folding member 59a on the near side of the second forming portion 6b, and above the center portion of the third forming portion 6c, respectively. 69c, 69d, and 69e are provided. As shown in FIG. 6, each of the upper conveyor belt devices 69 a to 69 e is provided with an endless belt 70 such that each lower surface runs along the vacuum conveyance surface in the conveyance direction, and can move up and down. In addition, the position can be moved in the width direction of the vacuum transfer surface.

  Each of the upper conveyor belts 69a to 69e has substantially the same configuration, and the main part thereof will be described with reference to FIG. 19 with respect to two upstream upper conveyor belt devices 69b and 69c in the second forming part 6b. To do.

  A timing belt is used as the belt 70. Therefore, a timing pulley having teeth on the outer periphery is used for each pulley 71 for guiding the belt. Of these pulleys 71, the pulleys 71 arranged on the side where the belt 70 is brought into contact with the vacuum conveying surface are supported so as to be pivotable in the vertical direction with respect to the frame 72, and by a helical spring 73 or the like. The arm 74 urged downward is rotatably supported at the tip end portion. The other pulleys are also supported by the frame 72, and this frame 72 is movably supported by a sliding guide member 75 provided in a direction perpendicular to the conveying direction. By moving the frame 72 with respect to the guide member 75, the upper conveyor belt devices 69b and 69c are moved in the width direction.

  As shown in FIG. 19, the belts 70 and 70 of the two upper transport belts 69b and 69c on the upstream side in the second forming portion 6b press the gusset rear end portion protruding from the inner pressing plates 56c and 56d. The folding angle of the lever is set to an acute angle.

  The downstream upper conveyor belt device 69c in the second forming portion 6b is the same as the position in the width direction of the upstream upstream conveyor belt 69b. The tip of the gusset is pressed.

  Each belt 70 of each of the upper transport belt devices 69a to 69e is driven independently by a variable speed electric motor provided in each device, and each belt 70 of each of the upper transport belt devices 69a to 69e is Basically, it travels at the same speed as the vacuum transfer surface, but the speed can be individually adjusted by the variable control of the variable speed motor. As described above, each of the upper conveyor belt devices 69a to 69e can be moved up and down individually.

  As described above, the upper conveying belt device 69a provided in the first forming portion 6a is disposed at the center in the width direction of the vacuum conveying surface, and on the conveying surface from the start end portion of the first forming portion 6a to the end portion thereof. It is provided to touch. The width of the belt of the upper conveying belt device 69a in the first forming portion 6a is narrower than that of other devices, and the interval between the back gussets of the paper cylinder to be formed is narrow, for example, between the gusset backs Even when the interval is 30 mm, the bag sheet 3 can be pressed and conveyed between the opposite sides of the gusset.

  In the first forming portion 6a, the bag paper 3 can be transported in a sufficiently stable state on the vacuum transport surface by transporting the bag paper 3 as a sheet. The upper conveyor belt device 69a is not always necessary.

  Accordingly, when the gap between the gussets is smaller than 30 mm and the upper conveyance belt device 67a interferes with the inner gusset inner end when the gusset portion of the first forming portion 6a is Z-folded, the upper conveyance belt device 69c. It is not necessary to use this.

  The upper conveying belt device 69e provided in the third forming portion 6c is the upper side where the folded portion of the bag paper 3 is folded back by the second forming portion 6b, and slightly beyond the center (a position eccentric in the width direction). This part is conveyed from the upper side in contact with the upper surface.

  Thus, in each of the upper conveyor belt devices 69a to 69e, the first forming portion 6a causes the bag paper 3 whose both side gusset portions are folded in a Z-shape to be conveyed on the vacuum conveyance surface by the upper conveyor belt device 69a. It is conveyed synchronously with.

  In the second forming portion 6b, the gusset back folded portion in a state in which the folded portions of the gusset portions on both sides are folded inward at this portion is pressed by the upstream upper conveyor belt devices 69b and 69c, and the paper tube The width regulating members 60c and 60d guide the both outer sides of the gusset folding portion, and are conveyed in synchronization with the conveyance speed of the vacuum conveyance surface. Further, in the second forming portion 6b, the gusset back folding portion of the front gusset portion is conveyed in synchronization with the vacuum conveyance surface while being handed over and pressed by the upper conveyance belt device 69d on the downstream side.

  Further, in the third forming portion 6c, the third forming portion 6c is folded in two at a position away from the portion where the glue application of the front side gusset portion is performed in the third forming portion 6c to become a cylindrical shape. The upper surface of the folded portion of the bag 3 is pressed by the belt 70 of the upper conveying belt device 69e, and the upper conveying force synchronized with the vacuum conveying surface is applied to this portion.

  At this time, as described above, each of the upper conveyor belt devices 69a to 69e is driven in synchronism with the conveying speed of the lower vacuum conveying surface, that is, at a constant speed, but the forming resistance in each of the forming portions 6a to 6c. Thus, when the traveling speed of the bag paper 3 during the forming process changes, for example, delays with respect to the traveling speed of the vacuum conveying surface, the traveling delay of the bag paper 3 is detected and the upper conveying belts 67a to 67e are detected. The running speed of the belt 68 is decreased to synchronize with this.

  Further, in the second forming portion 6b, when the bag paper 3 is inclined with respect to the traveling direction due to the difference in folding resistance between the folding portion of the front side and the far side gusset portion, the upper conveying belt device provided on both sides The running posture of the bag 3 can be controlled by changing the running speed of the belts 70b, 69c, and 69d.

  The same applies to the third forming portion 6c, and the bag paper 3 in this bonding step is easily inclined due to the bonding resistance of the third forming portion 6c, but is provided at a position eccentric in the width direction with respect to the center of the vacuum conveyance surface. The posture of the bag paper 3 traveling here is controlled by the speed control of the upper conveying belt device 69e. The third forming portion 6c may also be provided with the paper tube width regulating members 60c and 60d.

  As shown in FIGS. 6 and 7, the fourth forming portion 6 d is composed of a pair (or a plurality of pairs) of press roller pairs 76. 2, Z-folding of the gusseted portion at each of the third forming portions 6a, 6b, and 6c, folding-back of the folded-back portion, and the folded-back portions are bonded to each other to press the paper tube formed into a cylindrical shape from the bag paper To the downstream corner forming apparatus 1.

  The corner bottom forming device 1 is not directly related to the paper tube forming device 2 in the present invention and will not be described in detail. In the corner bottom forming device 1 shown in FIG. 1, reference numeral 77 denotes paper supplied from the paper tube forming unit 6. A bottom opening device that performs bottom opening processing while the cylinder moves along the bottom folding drum 78, 79 is a glue application device that applies glue to the flap surface that is opened, and 80 is a bottom that folds the flap and closes the bottom. A closing device 81 is a delivery device that discharges the closed paper cylinder while pressing it, and the steps (d) and (e) shown in FIG. 22 are performed in these devices.

At this time, as described above, the bottom opening device 77 of the square bottom forming device 2 is obtained by attaching the oblique lines L _{7a to} L _7e to the bag paper 3 in the portions where the flaps F ₁ and F ₂ are obliquely folded. Opening the bottom smoothly by folding the flap at.

It is a schematic explanatory drawing of the square bottom bag making machine provided with the paper tube forming apparatus which concerns on this invention. It is a top view which shows a paper feed part. It is a front view which shows a paper feed part. It is a front view which shows a creasing part schematically. It is a top view which shows a creasing part schematically. It is a front view which shows a paper tube formation part roughly. It is a top view which shows a paper tube formation part roughly. It is a top view which shows a conveyance belt apparatus partially fractured | ruptured. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows a 1st formation part. It is a perspective view which shows a gusset folding apparatus. (A), (b), (c) is operation | movement explanatory drawing of the gusset folding apparatus shown in FIG. It is a top view which shows a 2nd formation part. (A), (b) is an operation explanatory view of a pasting margin folding device. (A), (b) is operation | movement explanatory drawing of a double fold part folding | turning apparatus. It is a top view which shows a 3rd formation part. It is a top view which shows arrangement | positioning of an upper side conveyance belt apparatus. It is sectional drawing which shows the principal part of the upper side conveyance belt apparatus in a 2nd formation part. It is a perspective view which shows the square bottom bag bag-formed with the square bottom bag making machine using this invention apparatus. It is a top view which shows the bag paper crooked by the creasing part of this invention apparatus. It is a bag making process figure of the square bottom bag using the bag paper shown in FIG. It is a bag making process figure of the square bottom bag using the conventional creased bag paper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Square bottom formation apparatus 2 ... Paper cylinder formation apparatus 3 ... Bag paper, 3a, 3b ... Sheet paper 4 ... Paper feed part 5 ... Stitching part 6 ... Paper cylinder formation part 7 ... Stacker 8 ... Paper feeder 9 ... Bonding and conveying apparatus 10a, 10b ... 1st and 2nd stopper 11 ... 1st conveyance path 11a ... 1st horizontal feeding part 11b ... Downward feeding part 11c ... 2nd horizontal feeding part 11d ... Upward feeding part 11e ... 3rd horizontal Feed unit 12 ... second transport path 13, 15 ... transport belt 13 a ... feed roller 14, 19 ... guide plate 16 ... press guide machine 17 ... machine frame 18 ... ball 20 ... glue applicator 20a ... glue 21 ... intermediate transport path DESCRIPTION OF SYMBOLS 22 ... Press roller apparatus 23 ... Roller conveyor 24 ... Machi crease roller part 24a, 24a '... Left and right gusset back crease roller pair 24b, 24b' ... Left and right inner gusset creasing roller pair 24c, 24c '... Left and right outer side Gusset Roller pair 25 ... Folding creasing roller part 25a ... Folding creasing roller part 26 ... Machi part oblique creasing roller part 26a, 26b, 26c, 26d, 26e ... Machi part oblique creasing roller pair 26f, 26g ... Shaft 27 ... Folding rebar roller portions 27a, 27b ... Left and right reversing rebar roller pairs 28 ... Fold creasing roller portions 29 ... Press portion 30 ... Glue application device 31a, 31b, 31c, 31d, 31e, 31f ... Conveyor belt device 32 ... Conveying belts 33a, 33b ... Rollers 33c ... Tension rollers 34 ... Suction holes 35 ... Vacuum chambers 36 ... Vacuum tubes 37 ... Slits 38 ... Guide plates 40 ... Conveying rollers 41 ... Shafts 42a, 42b ... Machi folding devices 43 ... Inner pressing plates 44 ... splash plate 45 ... spatula plate 46 ... gusset folded plate 46a ... inclined edge 46b ... protruding tip edge 47 ... support plate 48 ... Rolling disk 49 ... support shaft 52,53 ... pushing and bending member 54 ... outer pressing plate 55 ... support plate 56a ... pasting folding device 56b ... bifold folding device 56c, 56d ... gusset pressing plates 57a, 57b ... up plate 58a, 58b ... Spatula plates 59a, 59b ... Folding members 60a, 60b ... Press plates 60c, 60d ... Paper tube width regulating members 61 ... Folding guide members 62 ... Support frames 63 ... Frames 64a, 64b ... Rail members 65 ... Screw shafts 66 ... Saddle 67 ... Handle 68 ... Pressing plate 69a, 69b, 69c, 69d, 69e ... Upper conveyor belt device 70 ... Belt 71 ... Pulley 72 ... Frame 73 ... Screw spring 74 ... Arm 75 ... Guide member 76 ... Press roller pair 77 ... Bottom opening device 78 ... Bottom folding drum 79 ... Gluing device 80 ... Bottom closing device 81: Delivery device L ₁ , L ₁ ′: gusset back muscles L ₂ , L ₂ ′ on both sides L ₃ , L ₃ ′ on both sides L ₃ , L ₃ ′: gusset muscles L ₄ , L ₄ ′ on both sides L Muscle L ₅ ... Folding muscle L ₆ ... Folding muscle L _7a , L _7b , L _7c , L _7d , L _7e ... Machi part oblique muscle

Claims (7)

A paper feed unit that supplies bag paper one by one, a creasing portion for folding the bag paper as a square bottom bag, and an M-shaped bag paper with creases on both sides Made of a paper tube forming section that folds into a cylindrical shape having a gusset of gussets, and the bottom of the cylindrical paper tube is formed into a square bottom shape with a square bottom forming device along the fold line. In a paper tube forming apparatus in a bag machine,
The sheet feeding unit is provided with a joining means for joining two sheets of paper in the width direction,
Folding the paper tube forming portion inwardly with a first forming portion that folds the gusset portions on both sides in a Z-shape, a pasting allowance that is the outside of one gusset portion, and a double fold portion that is the outside of the other gusset portion 2 forming part and a third forming part that presses the overlapping part of the pasting allowance and the two-folded part and adheres to this part with glue applied in advance,
A square-bottom bag making machine characterized in that a conveyance surface over the entire length in the conveyance direction of the paper tube forming portion is a vacuum conveyance surface, and the bag paper supplied from the creasing portion is conveyed in a negative pressure suction state. Paper tube forming apparatus.   The conveyance surface of the paper tube forming portion that extends over the entire length in the conveyance direction is configured by a conveyance belt arranged in a plurality of rows in the width direction, and a plurality of suction holes are provided in the entire length of each conveyance belt, and this is the conveyance surface of the conveyance belt 2. A paper tube forming apparatus in a square bottom bag making machine according to claim 1, wherein a vacuum chamber communicating with the suction hole in this portion is provided on the back side of the bag. The upper conveying belt device comprising a belt having a conveying surface that runs in the conveying direction along the vacuum conveying surface is conveyed on both sides in the width direction of the second forming portion of the paper tube forming portion and the second forming portion. This is provided at a position for pressing the fold-back folded portion of the gusseted bag paper, and a position for pressing a portion shifted from the center in the width direction on the upper surface of the folded portion of the third forming portion. each upper conveyor belt device, the height as well as movable in the direction and the width direction, the corner bottom bag bag-making machine of any one of claims 1, 2, characterized in that the adjustable transport speed Paper tube forming apparatus.   The paper tube width regulating portion for guiding the side edges of the folding portions on both sides in the width direction of the bag paper folded inward at the second forming portion is provided on both sides in the width direction of the second forming portion. Item 4. A paper tube forming apparatus in a square bottom bag making machine according to any one of Items 1 to 3. In the creasing section for attaching a crease for forming a fold as a square bottom bag on the bag paper fed from the paper feeding section,
In addition to the gusseted muscles on both sides, the gusseted muscles on both sides of each gusseted muscle, the folding muscles, the folding muscles, and the folding muscles, the diagonal part of the gusset that becomes the folding line of the oblique opening of the flap when forming the square base The paper tube forming device in the square bag making machine according to any one of claims 1 to 4, wherein a streak is provided. On both sides in the width direction of the first forming portion of the paper tube forming portion, a gusset folding device that folds the gusset portion on the front side and the far side of the bag paper in a Z shape is provided symmetrically. A fold-back plate that forms the gusset back by pushing the back side of the fold-back gusset back inward, and a spatula plate that raises and guides the fold-up portion of the bag paper to the fold back plate is provided. the peripheral surfaces paper tube forming apparatus at the corner bottom bag bag-making machine according to any one of claims 1-5, characterized in that a rotating disc that contacts the back side of the part folded gusset. 7. A paper tube forming apparatus in a square-bottom bag making machine according to claim 6 , wherein the gusset folding plate of the gusset folding device is movable in a symmetric direction with respect to the gusset folding device.

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