JPH1191003A - Bag making machine and bag making method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a paper bag without any folding line efficiently and improve the accuracy of setting of the forming position of side line of the bottom of the bag by a method wherein a paper tube is turned and transferred by the rotation of a bottom folding drum while a rear pressing pawl as well as a rear raising pawl are positioned near the bottom folding line of a surface side flap. SOLUTION: The folding part of a paper tube is pinched by the opening and closing pawl of a bottom opening device and the opening and closing pawl 643 of a bottom folding drum 640 while the rear surface paper side tip end of the paper tube, whose bag bottom is opened by a catching pawl 641 provided on the bottom folding drum 640 arranged near the bottom opening device, or a rear side folding flap is pinched. Thereafter, the paper tube is transferred by the rotation of the bottom folding drum 640. A rear pressing pawl 644 as well as a rear raising pawl 645 are positioned near the bottom folding line of a front side folding flap. The rear raising pawl 645 is rotated toward upward in accordance with the pivoting operation of a pivotable shaft 645B whereby the fore side of the bottom folding line in the front side folding flap is pushed by the rear pressing pawl 644 and the rear side of the bottom folding line is raised by the rear raising pawl 645.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag making machine and a bag making method for continuously forming paper bags such as shopping bags.

[0002]

2. Description of the Related Art In this type of a square bottom paper bag making machine, while a single sheet of bag paper P cut in advance to a predetermined size is sequentially and intermittently conveyed by a conveying device, FIGS. As shown in b), both sides are folded into an M-shape, folded in two, and the outer edges thereof are glued to form a paper tube T having front and rear openings. Thereafter, FIGS. As shown in e), the bottom folded line L4 and the bottom folded line L5 are engraved on the paper cylinder T in parallel with each other, and the bottom folded drum for processing the bottom of the paper cylinder T is folded back on the back side of the paper cylinder T. While holding T1, the paper cylinder T is rotationally transported with the rotation of the bottom folding drum, and only the front side folding flap T2 is turned upside down from the bottom folding line L4, so that the front and back flaps T1 and T2 are folded down. Is developed in a plane along the outer circumference of the
After gluing it to T2, the front and back folding flaps T1 and T2 are folded back and then folded inward to form a square bottom portion B1 serving as the bottom of the paper bag B.

[0003] When forming the square bottom portion of the paper bag T, the bottom folding line L4 of each of the front and back folding flaps T1 and T2, which are spread out in a plane along the outer circumference of the bottom folding drum, is bottom folded by a pushing blade. The bottom folding line L4 is pushed into a groove provided in the drum and is opened and closed by a front clamping claw provided in the groove.
The front and rear flaps T1 and T2 are folded back inward, so that the front-side folded flap T2 that is turned upside down is narrowed by the front gripping claw. , A bite mark remains at the lower part of the paper tube T, and a streak appears on the completed paper bag B,
The appearance is unsightly, and there is a problem that it is unsuitable especially for a paper bag that emphasizes the appearance design such as a gift.

For this reason, a technique such as a "square bottom bag making machine" described in Japanese Patent Application Laid-Open No. Hei 7-164579 has been proposed.
In the square-bottom bag making machine in this technical example, an opening / closing claw is arranged between the surface paper of the paper cylinder T and the front-side folding flap T2 which is flatly developed along the outer periphery of the bottom folding drum, and the closing is performed. The claw bites around the bottom folding line L4 of the front side folding flap T2, and the bottom folding line L4 is pushed between the opening and closing claws by a pushing blade.
And the front side folding flap T2 is folded inward.

[0005]

However, in the above example, although no bite mark remains at the lower part of the paper bag, the front side flap bitten by the opening / closing claw is scratched by biting, and the paper quality is particularly poor. There is a problem that the quality of the aesthetic appearance is greatly increased in the case of the garment or the surface-treated bag paper. Furthermore, since the opening / closing claw is located between the front side folding flap and the surface paper of the paper cylinder, the front side folding flap rises by the thickness of the opening / closing claw from the paper cylinder developed on the outer peripheral surface of the bottom folding drum, There has been a problem that the formation of the bottom side line of the bag bottom formed by the flap folding device cannot be set accurately, and that the gluing by the gluing roller is not performed accurately.

The present invention has been made in view of the above circumstances, and aims to achieve the following objects. An object of the present invention is to provide a square-bottom bag making machine capable of efficiently forming a straight paper bag. To prevent scratches caused by biting in the front flap. Improving the accuracy in setting the formation position of the bottom side line of the bag bottom. Glue both front and back flaps correctly.

[0007]

Means for Solving the Problems Bag paper for a paper bag is folded in two and bonded together, and both sides are folded inward to form a paper cylinder having an M-shaped folded portion. The bottom fold line of the fold flap and the bottom fold line are formed in parallel on the front and back of the paper cylinder located near the bottom of the bag, and the front fold flap is turned upside down from the bottom fold line, and the front fold flap and A paper feeder for supplying bag paper in a square-bottom bag making machine in which each of the front and back folding flaps is folded inward from the bottom folding line so as to form a square bottom portion of the paper bag so that the back folding flaps are overlapped. A handle device for forming the handle and attaching the handle to the bag paper; a fold line and a fold line for forming the fold at substantially the center and the outer edge of the bag paper supplied from the paper feeding device; A crease device for engraving lines and fold lines The bag paper is transported from the creasing device to the bag bottom forming device, and the bag paper is folded and stuck in two along the folding line, the folding line, and the folding line cut by the creasing device. And a bag bottom forming device for forming a square bottom portion serving as the bottom of the paper bag. A bag bottom forming device, which supplies a formed paper cylinder continuously at intervals, a supply device, and a bottom fold line and a bottom disposed near the bottom of the paper bag, which is disposed at the end side of the supply device and is a corner bottom portion of the paper bag. A bottom-folding crease device for forming a folding line, a bottom-folding drum having a catching claw that sandwiches a back-side folding flap of the paper cylinder, and rotatably transporting the paper-circle by rotation; A bottom-opening device that is disposed and adsorbs the bag bottom side of the paper cylinder to open the bag bottom, and a bottom-folding line formed by the creasing device provided near the outer periphery of the bottom-folding drum. A flap folding device for folding the front folding flaps upside down and flattening each of the folding flaps along the bottom folding drum, a press roller for pressing the unfolded paper cylinder, and gluing the front and back folding flaps. The gluing device and the front and back flaps A flap raising device for standing, it is those having a bag bottom folding apparatus of attaching the respective folding flap. On the outer circumference of the bottom folding drum, there are a catching claw that catches the tip of the back side folding flap of the paper cylinder, a front holding claw that bites the front and rear positions of the bottom folding line of the back side folding flap, and an opening / closing claw arranged on the bottom opening device. Correspondingly, an opening / closing claw that clamps the paper cylinder from the folding portion, a back holding claw and a back raising claw located near the bottom folding line of the front flap,
A suction port for sucking the back flap is provided. The catching claw is located at a central portion in the axial direction of the bottom folding drum, and a tip portion of the catching claw extends from the inside to the outer periphery of the bottom folding drum. The backside folding portion is formed by the tip portion of the catching claw and the bottom folding drum. It is assumed that the 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 opposite to the fixed claw. Between the front and back of the bottom folding line. Further, on both sides of the bottom folding drum, for example, a pressing claw for pressing a front position of a bottom folding line of the front folding flap from above the front folding flap, and a front folding at a position behind the bottom folding line of the front folding flap. A raised nail positioned between the flap and the face paper of the paper cylinder is assembled. The back holding claw and the back-raising claw are arranged in pairs in the width direction of the bottom folding drum,
The mounting bracket is attached to the mounting bracket integrated with the rear holding claw and the rear raising claw, respectively. The mounting bracket includes a supporting bracket fixed to the bottom folding drum and rotating integrally with the bottom folding drum. A movable shaft that is slidably guided and rotatably supports the mounting bracket, and a push-up lever for rotating the rear holding claw toward the bottom folding drum, or for rotating the rear raising claw toward the bottom folding drum. And a push-down lever. Each movable shaft has a cam abutting portion at an outer end thereof, and the cam abutting portion is located on a side portion of the bottom folding drum and moves along each cam surface fixed to the main body frame. Thus, the rear holding claw and the rear raising claw reciprocate in the axial direction of the bottom folding drum. In addition, a protruding cam contact portion is disposed at the tip of the push-up lever or the push-down lever.
Further, a first left and right cam and a second left and right cam that are in contact with the cam contact portions of the respective movable shafts are fixed to the main body frame corresponding to the respective movable shafts on both outer sides of the bottom folding drum. In the radial direction from the axis of the bottom folding drum of the first and second left and right cams, the first and second cams and the second upper and lower cams respectively come into contact with the cam contact portions at the tips of the push-up lever or the push-down lever. An upper and lower cam is fixed integrally with the first and second left and right cams. The movable shaft is pressed against the first and second left and right cams by a spring disposed in a concave portion formed on the other end side,
Also, the push-down lever or the push-up lever is configured to be pressed against the first and second vertical cams by a spring spanned between each mounting bracket and the support bracket. The first up / down and left / right cams are shaped to hold the front surface paper of the paper cylinder when the back-raising pawl opens the bag bottom of the paper cylinder by the bottom-opening device. The shape is such that the paper cylinder pressed by the press roller is pressed. As a flap rising device, a rotary shaft having two flat pressing blades is provided horizontally in front of the bottom folding drum, and the paper conveyed by the bottom folding drum is rotated by the rotation of the rotary shaft. The pushing blade is pressed along the bottom folding line in each of the folding flaps on the front and back sides of the cylinder, and between the front holding claw and the rear holding claw and the rear raising claw which hold the vicinity of the bottom folding line in an open state. It is supposed to be invited. At this time, the front side folding flap is held down from the both sides in the width direction by pressing the front side of the bottom folding line in the front side folding flap from both sides in the width direction, and raising the rear side from the both sides in the width direction with the claw. Fold each inward from the line.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bag making machine and a bag making method according to the present invention will be described below with reference to the drawings. 1 to 46, reference symbol M denotes a bag making machine, P denotes bag paper, T denotes a paper cylinder, B denotes a paper bag, H denotes a handle, 1 denotes a paper feeder,
2 is a handle device, 3 is a creasing device, 4 and 5 are paper tube forming devices, 6 is a bag bottom forming device, and 7 is a counting device.

As shown in FIGS. 1 to 34, the bag making machine M includes a sheet feeding device 1 for supplying bag paper P, a handle device 2 for forming a handle H and attaching the handle H to the bag paper P. ,
A crease device 3 for engraving a fold line L1, a fold line L2, and a fold line L3 for forming a fold portion P1 at one edge and substantially the center of the bag paper P supplied from the handle device 2. And the bag paper P is conveyed from the creasing device 3 to the bottom forming device 6 and along the folding line L1, the folding line L2, and the folding line L3 carved by the creasing device 3. Paper tube forming devices 4 and 5 for forming a paper tube T by folding and pasting P in two, a bag bottom forming device 6 for forming a square bottom portion B1 of a paper bag B, and a square bottom portion formed. It is provided with a counting device 7 for pressing the paper bag B and sending it out to the product stand, and counting the number of manufactured paper bags B.

As shown in FIG. 1, the paper feeding device 1 is located at the uppermost stream of the bag making machine M, and separates paper bags (sheets) P for paper bags which have been cut into predetermined dimensions in advance. The bag paper P is set to be capable of supplying, for example, a paper sheet having a maximum dimension of about 600 mm in the transport direction (vertical direction) and a maximum dimension of about 1050 mm in the horizontal direction (width direction). Is done.

FIG. 40 (a), FIG.
As shown in (b), for example, a sticking section (sticking paper) H
1 and a string-shaped handle portion H2 are integrally formed to form a handle H, and a substantially J-shaped and substantially inverted J-shaped cut J is formed at an end located on the rear side in the transport direction of the bag paper P serving as a bag mouth. let me in,
Further, the end located on the rear side of the bag paper P is a folded part P4 that is folded back from the folded line L6, and the sticking part H1 of the handle H is attached to the inside of the folded part P4 at, for example, two predetermined positions. Then, the fold portion P4 is folded back from the fold line L6 and bonded to form a portion serving as a bag mouth of the paper bag B, and is connected to the sheet feeding device 1 as shown in FIGS. Sticking drum 21 for rotatingly transferring bag paper P
And a cutter portion 22 for engraving a cut J for positioning the handle portion H2 on the outside from the inside of the folded portion P4, and gluing for gluing the handle H and the bag paper P. Unit 23 and a handle supply unit 24 for supplying the handle H
Folding means 25 for folding the folding part P4 from the folding line L6
And pressing means 26 for pressing the folded fold part P4.

As shown in FIGS. 2 to 6, the sticking drum 21 is constituted by an assembly of a plurality of divided drums 21B fixed at appropriate intervals to a mounting cylinder fixed to a rotating shaft 21A, for example. For example, two sets of this assembly are arranged, and have a drive gear 21a connected to a drive source (not shown) fixed to the rotating shaft 2A. As shown in FIGS. 3 and 6, each of these divided drums 21B has a catching claw 21C arranged on the outer periphery of the sticking drum 21 to hold the leading end of the bag paper P, and a fold line L6 of the bag paper P.
Are arranged, and a jaw plate 21F for folding the fold part P4 from the fold line L6 is disposed. As shown in FIGS. 3 and 6, the catching claw 21C is attached such that its tip end portion extends outside the outer periphery of the attaching drum 21 and is rotatable by a shaft 21Ca that is parallel to the rotating shaft 21A. Attached over substantially the entire width of the drum 21, similarly to a catching claw 641 of the bag bottom forming device 6 described below, the front end of the catching claw 21 </ b> C and the outer periphery of the attaching drum 21 sandwich the front side in the transport direction of the bag paper P. It shall be. On the other hand, as shown in FIG. 3, the holding claws 21D and 21E are fixed to the fixed claws 21 fixed to the ends of the divided drum 21B.
D and a movable claw 21E that is rotatably provided inside the affixing drum 21 by a shaft 21Ea in opposition to the fixed claw 21D.
As in the case of 642A, opening and closing of the movable claw 21E causes
The front and rear sides of the fold line L6 of the bag paper P are sandwiched.
As shown in FIGS. 3, 5, and 6, as the jaw plate 21F,
A plurality of L-shaped plate bodies are rotatably mounted on a rotating shaft 21Fa which is parallel to the rotating shaft 21A, and are attached at intervals over substantially the entire width of the sticking drum 21. The plate 21F is rotated by the rotation of the rotation shaft 21Fa so that the front end portion Fb of the sticking drum 2 of the holding claws 21D and 21E.
1 is provided so as to be rotatable between a state located outside the outer periphery of the attaching drum 21 as a radially outer position and a state where the entire jaw plate 21F is located inside the outer periphery of the attaching drum 21, and a synchronization setting means. 21G, sticking drum 2
It is arranged so that it can be installed at a position with respect to the catching claw 21C at a circumferential position on one surface. As shown in FIGS. 5 and 6, the synchronization setting means 21G includes a movable elongated hole 21Ga that enables the rotation shaft 21Fa to be set in the circumferential direction of the attaching drum 21;
Synchronous setting gear 21G connected to the drive shaft Fa and capable of being synchronously set with the drive gear 21a and arranged coaxially with the rotary shaft 21A.
b, and sets the synchronization setting gear 21Gb with respect to the drive gear 21a of the sticking drum 21 to the phase position of the shaft 21Ca and the rotating shaft 21Fa in the sticking drum 21, that is, the central angle indicated by the angle α in FIG. By fixing the paper bag B, the height of the paper bag B, that is, the size of the bag paper P in the transport direction can be handled. The catching claws 21C, the holding claws 21D and 21E, and the jaw plate 21F are provided with a cam (not shown), a bracket, a shaft, a cam contact portion, and the like in the same manner as the rear holding claw 644 and the rear raising claw 645 described later. Opening / closing operation and rotation operation are performed via the.

As shown in FIGS. 2 and 4, an advance roller 29A, a first gluing section 27, a handle transport section 24B described later, and a second Gluing section 28, delivery roller 26A
And the advance roller 29A has a catching claw (not shown) similar to the catching claw 21C.

As shown in FIG. 2, the cutter section 22
At 0 (a), the substantially J-shaped and substantially inverted J-shaped notches J shown in (b) for inserting into the cut-off portion P4 of the bag paper P have substantially J-shaped and substantially inverted J-shaped blades. The upper rotary shaft 22B on which two sets of cutters 22A are arranged, for example, and the cutter 22A
And a lower rotating shaft 22D having a blade receiving portion 22C. The upper rotating shaft 22B is provided with two sets of cutters 22A capable of adjusting the mounting position in the axial direction of the upper rotating shaft 22B.
The blade receiving portion 22C is screwed to the lower rotating shaft 22D so that the mounting position can be adjusted at a position corresponding to the cutter 22A, and the blade receiving portion 22C is screwed to one side of the lower rotating shaft 22D. A transmission gear that meshes with a drive gear that branches and transmits the rotation from the drive source is fixed, and the lower rotation shaft 22D is rotationally driven through these gears, and the rotation is performed by the lower rotation shaft 22D and the upper rotation shaft 22B. Upper rotating shaft 2 via a plurality of relay gears fixed to the other side of
2B, the upper rotating shaft 22B is rotated in the opposite direction to the lower rotating shaft 22D, so that the bag paper P supplied from the paper supply device 1 is folded into the rear folding section P4 in the transport direction.
The cutter 22A is brought into contact with the blade receiving portion 22C, and the handle portion H2 of the handle H at the time of folding is cut into a substantially J-shaped and substantially inverted J-shaped cut J located outside the bent portion P4. It shall be. FIG. 40 (a) shows the upper rotating shaft 22B.
As shown in Fig. 7, after the folded portion P4 is bonded to form the paper cylinder T, a cutter for cutting the transverse end of the folded portion P4, which becomes the folded portion P2, as the cut portion K is provided. As shown in FIG. 2, for example, a pair of upper and lower pinch rollers 20A and 20B and a feeder are provided between the cutter unit 22 and the sheet feeding device 1 and between the cutter unit 22 and the advance roller 29A on the sticking drum 21 side. A plurality of plates 20C are arranged, and the pinch rollers 22A and 22B are rotated in opposite directions by driving means to narrow the bag paper P, thereby allowing both sides of the bag paper P supplied from the paper feeding device 1. Is pressed to transfer the sheet on the feed plate 20C to the cutter section 22 side and from the cutter section 22 to the advance roller 29A side.

As shown in FIGS. 2 and 4, the gluing section 23 is a bag paper P except for the vicinity of the cut J of the folding section P4.
And a second gluing unit 28 for gluing the sticking portion H1 of the handle H to the bag paper gluing positions N, N3, N4. As shown in FIGS. 2 and 4, the first gluing section 27 is located on the outer periphery of the attaching drum 21 and above, that is, downstream of, the advance roller 29A, and is a tank for storing, for example, starch glue or chemical glue-based adhesive. 27A, a gluing roller 27C having a gluing pad 27B made of synthetic rubber or the like on the outer peripheral surface, and relay rollers 27D and 27E provided between the tank 27A and the gluing roller 27C so as to face the upper side of the tank 27A.
The adhesive in the tank 27A is adhered to the glue pad 27B of the glue opening roller 27C via the relay rollers 27D and 27E, and glued to the bag paper P by the rotation of the glue roller 27C. It is said. The gluing roller 27C is driven in synchronization with the sticking drum 21, and the gluing position on the bag paper P can be set by setting the position of the gluing pad 27B on the gluing roller 27C. The configuration is the same as that of the gluing roller 662 of the device 660. Second gluing section 28
As shown in FIG. 2 and FIG. 4, a tank 28A that is located on the outer periphery of the attaching drum 21 and downstream of the handle supply unit 24 and stores, for example, starch paste or chemical paste adhesive or the like.
And a gluing pad 28B made of synthetic rubber or the like on the outer peripheral surface
, And relay rollers 28D and 28E provided between the tank 28A and the glue rotating unit 28C so as to face the upper side of the tank 28A, and the adhesive in the tank 28A is Relay rollers 28D, 2
The adhesive is attached to the glue pad 28B of the glue rotation unit 28C via 8E, and the bag paper P is glued by the rotation of the glue rotation unit 28C. As shown in FIGS. 2 and 4, the gluing rotating unit 28C is rotatable by a rotating shaft 28F, has a substantially arc-shaped cross section centered on the rotating shaft 28F, and serves as a gluing surface on which the gluing pad 28B is located. It is driven in synchronization with the attaching roller 21, and the gluing position on the bag paper P can be set by setting the position of the gluing pad 28B on the glue rotating unit 28C having a cylindrical shape, for example. At 28F, a pushing blade 25A as a folding means 25 described later is provided.
Note that the gluing section 23 may be configured to have a glue spray or the like.

In the gluing section 23, the glue pad 2
By setting the positions of 7B and 28B, as shown in FIG.
The first gluing section 27 glues the bag paper P to the bag paper gluing position N which is located over substantially the entire width of the bag paper P on the side where the bag bottom is formed from the fold line L6 of the bag paper P, and the second gluing section 28
Handle H attached to the bag paper gluing position N
Is set to perform gluing on the surface of the pasting portion H1. Alternatively, as shown in FIG. 41, the gluing section 23 sets the first gluing section 27 by setting the positions of the gluing pads 27B and 28B.
By this, gluing is performed at the sticking position N1 of the sticking portion H1 of the handle H and the bag paper gluing position N3 which is the sticking position N2 of the folding part P4 excluding the portion corresponding to the sticking position N1,
It is also possible to set the second gluing section to glue the surface of the sticking section H1 of the handle H stuck to the bag paper P. Alternatively, the gluing section 23 is
By setting the positions of 7B and 28B, as shown in FIG.
The first gluing unit 27 glues the bag paper gluing position N4, which is a portion corresponding to the sticking position of the sticking unit H1 of the handle H, and the second gluing unit glues the handle H stuck to the bag paper P. It is also possible to set to glue the fold part gluing position N5, which is located over substantially the entire width of the bag paper P on the side where the bag bottom B3 is formed from the surface of the sticking portion H1 and the fold line L6.

As shown in FIG. 2 and FIG.
7 and the second gluing portion 28, and FIG.
(A), as shown in FIG. 40 (b), for example, a handle forming portion 24A that integrally forms a handle H by integrating a sticking portion (sticking paper) H1 and a string-shaped handle portion H2, and the handle forming portion 24A. And a handle conveyor 24B for conveying the handle H to the attaching drum 21. The handle conveyor 24B is, for example, a belt conveyor having a winding roller 24C and an endless belt 24D. The handle H is supplied to the bag paper P located on the outer periphery.

As shown in FIG. 2, FIG. 3, FIG. 5, and FIG. 6, for example, one pushing blade 25A is attached to the rotation shaft 28F of the second gluing section 28 of the gluing section 23 as shown in FIG. The rotating shaft 28F is driven in synchronization with the attaching roller 21. By the rotation of the rotating shaft 28, the pushing blade 25A is moved along the fold line L6 of the bag paper P conveyed by the attaching drum 21. Let it be pressed,
The holding claws 21D holding the vicinity of the fold line L6 in an open state,
It is supposed to be invited during 21E. And the pinching claw 2
By closing 1D and biting the front and rear of the fold line L6 of the bag paper P, the fold part P4 is raised, and the pinching claws 21D,
When the jaw plate 21F is rotated in accordance with the rotational movement of the pushing blade 25A, the bag paper P in the state of being bitten and raised by 21E is pressed by the tip Fb to hold the fold P4, and the fold P4 is folded. You.

As shown in FIG. 2, FIG. 4 to FIG.
Delivery roller 26A located downstream of gluing section 28
And a roller 26B corresponding to the delivery roller 26A
And a press roller 26E disposed, for example, in three pairs of an upper rotation shaft 26C and a lower rotation shaft 26D as a pair, and a press roller 29B located between the second gluing unit 28 and the delivery roller 26A. It is said. The delivery roller 26A is arranged on an outer peripheral portion of the delivery roller 26A and is driven by a driving unit (not shown) by a driving gear 26Aa.
A plurality of press pads 26a for pressing the fold P4 between the outer periphery of the attaching drum 21 and the like, a catching claw 26b for nipping the front side in the transport direction of the bag paper P, Press pad 26a to delivery roller 2
And a synchronization setting means 26F that can set the position with respect to the catching claw 26b at the circumferential position 6A. To hold the front side of the bag paper P in the transport direction. Press roller 26E
Is pressed by the press pad 26c to press the fold P4.
A is connected.

As shown in FIGS. 5 and 6, the synchronization setting means 26F is provided in parallel with the rotation axis of the delivery roller 21A, and the synchronization setting rod 26 to which the press pad 26a is fixed.
Fa and the synchronization setting rod 26 Fa
a, and a synchronous setting gear 21Fc connected to the synchronous setting rod 26Fa and arranged coaxially with the delivery roller 26A, and the synchronous setting gear 26Fb is driven. Synchronization setting is possible with the gear 26Aa and connected to the synchronization setting gear 21Fa and the synchronization setting means 26G of the synchronization setting means 21G. The synchronization setting means 26G is arranged coaxially with the upper rotation shaft 26C and is set as a synchronization state. A synchronization setting gear 26Ga for transmitting the 26C rotational driving force to the upper rotation shaft, the synchronization setting gears 26Ga, and the synchronization setting gear 26Ga;
Gear 26Gb that relays the synchronization setting gear 21Gb
And are arranged. By the synchronization setting means 26F and 26G, the transport direction of the bag paper P of the press pad 26a and the press pad 26c with respect to the phase position of the rotation shaft 21Ca and the rotation shaft 21Fa with respect to the attaching drum 21 set in the synchronization setting means 21G. The press position in can be set.

As shown in FIG. 1 or FIG. 7, the scoring device 3 cuts lines L such as a folding line L1, a folding line L2, and a folding line L3 for sandwiching the bag paper P to form a folding portion P1. A convex roller 31 having a ridge 31a for engraving substantially parallel, a concave roller 32 having a groove 32a corresponding to the convex roller 31 and a grooved roller 32 having a groove 32a corresponding thereto. At a predetermined position. Convex roller 31 and concave roller 3
For example, six sets are arranged corresponding to the two sets of the folding line L1, the folding line L2, and the folding line L3 shown in FIG. The intervals are arranged to be adjustable.

As shown in FIGS. 8 to 14, the paper tube forming devices 4 and 5 are roller conveyors 4 connected in series.
The first and second folding process sections 42 and 51 fold the bag paper P in two along the folding line L3. You.

As shown in FIGS. 1, 8 to 10, a number of conveyor rollers 43 connected to and driven by driving means (not shown) are parallel to the roller conveyor 41 in the first folding section 42. And a first folding section 44 that sandwiches and conveys the bag paper P to be conveyed from above and below, and that the center of the left and right fold lines L1 of the bag paper P has a length in the conveyance direction and is vertically An orientation setting transport unit 45 for setting the orientation of the bag paper P being transported with respect to the first folding section 44 is disposed therebetween.

The attitude setting and transporting means 45 is provided in FIG. 8 and FIG.
As shown in FIG. 2, the feed belt 46 has a pair of feed belts 46 for holding and transporting the bag paper P located on the transport surface F of the roller conveyor 41 from above and below.
Is wound around winding rollers 47a and 47b located at both ends 41a and 41b of the roller conveyor 41 and extends along the transport surface F of the roller conveyor 41; An endless upper feed belt 46b which can be pressed against the upper side of 46a.

As shown in FIGS. 8 and 9, the lower feed belt 46a has a T-shaped cross section on which meandering preventing protrusions are disposed, and is disposed over the entire length of the roller conveyor 41. 43 is located at the center in the left-right direction,
The upper surface 46c of the lower feed belt 46a is
Lower feed belt support means 4 for positioning on the first transport surface F
7 is disposed at a central position above the conveyor roller 43, and the winding rollers 47a and 47b
Conveyor rollers 43 located at both ends 41a, 41b of the
43, a groove corresponding to the meandering preventing protrusion is provided, and a roller conveyor 41 is provided on the lower feed belt 46a.
And a lower feed belt tension adjusting means 46e for adjusting the tension of the lower feed belt 46a.

The lower feed belt tension adjusting means 46e has the same structure as a tension adjusting means 48e described later, and the lower feed belt support means 47 has a lower feed belt 46a as shown in FIGS. And lower feed belt 46
For example, a bearing or the like disposed on a frame 43b or the like located at the center of the conveyor roller 43 is used to support the load applied to a.

As shown in FIGS. 8 and 9, the upper feed belt 46b has a T-shaped cross section in which meandering preventing protrusions are disposed, and the upper feed belt support 48 located above the lower feed belt 46a. And the upper feed belt supporting portion 4
8, an upper feed belt roller 48 on which an upper feed belt 46b is wound and a groove corresponding to the meandering preventing protrusion is disposed.
a, 48b, 48c, and the upper feed belt 4
Pressing means 4 for pressing 6b against lower feed belt 46a
8d, a tension adjusting means 48e for adjusting the tension of the upper feed belt 46b, and a vertical drive means 48f for vertically moving the upper feed belt support 48 are connected. The vertical driving means 48f is, for example, an air cylinder and is fixed to a frame (not shown).

As shown in FIGS. 8 and 9, the pressing means 48d has a pressing arm 48h rotatably supported on the upper feed belt supporting portion 48 above a shaft 48g disposed at one end.
And an urging member 48j such as a spring for urging the pressure arm 48h toward the lower feed belt 46a, and the upper end of the upper feed belt roller 4
8b, and a plurality of upper feed belt rollers 48b are provided over the entire length of the upper feed belt 46b corresponding to the lower feed belt 46a as positions corresponding to the plurality of lower feed belt support means 47.

As shown in FIGS. 8 and 9, the tension adjusting means 48e is provided with a support rod 48k erected on the upper feed belt support portion 48, and the support rod 48k can be fixed and released by a fastening means 48m and the position can be adjusted. Movable shaft 48 supported as possible
The movable shaft 48n is provided with an upper feed belt roller 46c, and the upper feed belt roller 46c can set the position of the movable shaft 48n with respect to the support rod 48k by the fastening means 48m. By doing so, the endless upper feed belt 46b is pressed outward to adjust the tension of the upper feed belt 46b.

As shown in FIGS. 8 and 9, the length of the upper feed belt 46b in the transport direction is set to be longer than the length of the bag paper P in the transport direction. The upper feed belt 46b and the conveyor roller 43 are disposed above the transport surface F so as to be introduced between the upper feed belt 46b and the conveyor roller 43.
6a, it is set substantially equal to the length of the roller conveyor 41 in the transport direction. FIG. 4 shows the width of the upper feed belt 46b.
For example, as shown in the figure, the width is set to be equal to or smaller than the width of the lower feed belt 46a.

As shown in FIG. 8, a gluing device 49 is disposed on the handle device 2 side of the first folding section 42. The gluing device 49 includes a glue spray for spraying glue on the bag paper P and a glue spray. A glue supply unit for supplying glue to the spray, a pressurizing means (not shown) for supplying pressurized air or the like to the glue spray for spraying the glue from the glue spray, a detecting means for detecting the position of the bag paper P; It has a control unit for controlling the glue spray, the glue supply unit and the pressurizing unit according to the detection result of the means, and as shown in FIG.
Gluing is performed on the end of the two-fold part P2 substantially in parallel with 1.

The first folding sections 44 are provided one by one on the left and right sides in the transport direction of the roller conveyor 41 along the position of the fold line L1 of the bag paper P to be transported as shown in FIG. 43, as shown in FIG. A first forming plate 44A for folding the bag paper P corresponding to the inside position above the fold line L1;
A flip-up unit 4 located outside of A and flipping up the bag paper P
4B and a first forming plate 44 connected to the flip-up portion 44B.
A fold press plate 44C which is located above A and folds the fold portion P1 from the outside corresponding to the position above the fold line L2, and a fold line L2 which is located above and inside the fold press plate 44C.
And a fold holding portion 44D that folds the folding portion P1 in response to the above. The first forming plate 44A is disposed over substantially the entire length of the roller conveyor 41 in the conveying direction, and its upstream side is inclined upward from the conveying surface F so that a bag is formed between the first forming plate and the conveyor roller 43. The paper P is introduced. The flip-up unit 44B has a conveyor roller 43 whose upstream side is located downstream of the upstream end of the first forming plate 44A, and which flips up the bag paper P from below.
And is inclined upward from the upstream side to the downstream side, and is disposed at a position above the transport surface F. The fold push plate 44C is connected to the flip-up section 44B, and has an end shape inclined inward toward the downstream direction so as to fold the flipped-up bag paper P. The fold holding portion 44D includes a vertical plate portion 44Da for setting the position of the bag paper P from the inside of the fold pressing plate 44C, and a horizontal plate portion 44Db for folding the bag paper P from above the fold folding plate 44C. The portion 44Db has a folded plate 4
It has a slope to approach 4C.

As shown in FIG. 1 or FIG. 8, a pair of press rollers 41A, 41B for forming the folded or folded bag paper P by sandwiching the folded or folded bag paper P from above and below is provided on the downstream side of the roller conveyor 41. Are provided, and position setting means for setting the press rollers 41A and 41B at predetermined positions is provided.
At least one of the rollers A is a taper roller having a tapered roller surface for partially pressing the folded line L1 or the folded line L2.

As shown in FIG. 1 and FIGS. 11 to 13, the second folding section 52 has a roller conveyor 51 having substantially the same structure as the first folding section 42 and a folding line L3. A second folding section 54 that folds the bag paper P into two folds and attaches the folded paper sheet P, and sandwiches the central portions of the left and right fold lines L1 of the bag paper P from above and below with a length in the transport direction. An attitude setting transport unit 55 for setting the attitude of the bag paper P being transported with respect to the folding section 54 is provided. As shown in FIG. 11, the attitude setting and conveying means 55 has a pair of feed belts 56 for nipping and conveying the bag paper P located on the conveying surface F of the roller conveyor 51 from above and below,
The feed belt 56 is connected to both ends 51 of the roller conveyor 51.
a, an endless lower feed belt 56a that is wound around winding rollers 57a, 57b located at positions 51a, 51b and extends along the transport surface F of the roller conveyor 51;
And an endless upper feed belt 56b which can be press-bonded to the upper side.

As shown in FIG. 11, the lower feed belt 56a has a lower feed belt supporting means 57 and has a configuration substantially equivalent to that of the lower feed belt 46a. Like the belt 46b, it has a T-shaped cross section, and is supported by an upper feed belt support portion 58 located above the lower feed belt 56a, as shown in FIG.
The upper feed belt supporting portion 58 has upper feed belt rollers 58a, 58b, 58c around which the upper feed belt 56b is wound.
Are provided, and pressing means 58d for pressing the upper feed belt 56b against the lower feed belt 56a, and tension adjusting means 58e for adjusting the tension of the upper feed belt 56b are provided. A vertical driving unit 58f that allows the belt supporting unit 58 to move up and down is connected. The vertical driving means 58f is, for example, an air cylinder and is fixed to the frame.

The pressing means 58d is, as shown in FIG.
A shaft 58g connected to the upper feed belt roller 58b, a pressure bonding arm 58h, and a biasing member 58j;
The upper feed belt roller 58b has a configuration substantially equivalent to that of the pressing means 48d, and a plurality of upper feed belt rollers 58b are arranged over the entire length of the upper feed belt 56b corresponding to the lower feed belt 56a as positions corresponding to the plurality of lower feed belt support means 57. You. The tension adjusting means 58e has substantially the same configuration as the tension adjusting means 48e. The upper feed belt 56b has a length in the transport direction longer than the length in the transport direction of the bag paper P, and the second folding section 52 Is set to be at least about half the length of the roller conveyor 51 in the transport direction, which is located on the upstream side of the lower feed belt 56a. For example, the width of the lower feed belt 56a is set to be larger than the width of the upper feed belt 56b.

The second folding section 54 is formed by the steps shown in FIGS.
43, a second forming plate 54A corresponding to the upper position of the folding line L3, a folding portion 59 that is folded in two in accordance with the folding line L3, and a folded-up half-fold shown in FIG. It has a guide portion 54B for guiding the portion P2 to the glue margin portion P3. The second forming plate 54A and the folding portion 59 are arranged along the folding line L3 of the bag paper P to be conveyed. ,
One set is provided on each of the left and right sides of the roller conveyor 51. The folding portion 59 is disposed in a folded state at a position above the second forming plate 54A from the outside position of the second forming plate 54A toward the downstream side, and is an endless portion for folding the two-fold portion P2 and the glue margin portion P3. It has a folded belt 59A in the shape of a circle.

The folded belt 59A is shown in FIG.
As shown in FIG. 2 (b) and FIG. 13, it is endless in the shape of a Mobius strip, and at the upstream end position of the second forming plate 54A, at a position outside and below the folding line L3 and the second forming plate 5
4A, and is wound on an upstream winding roller 59a positioned on the upstream end side of the roller conveyer 51 in contact with the lower side of the conveying surface F, and an upstream end of the second forming plate 54A. In the downstream direction from the position, the folding belt 59A
Is twisted upward, rises toward the vertical upper side of the folding line L3, is wound around a rising roller portion 59c having a vertical rotation shaft 59b, and further downstream from an intermediate portion of the second folding portion 54. Toward the folding belt 5
The upper side of the raised 9A is twisted inward to be in a collapsed state, and at the downstream end position of the second forming plate 54A, the downstream winding is performed so as to be substantially in contact with the upper surface of the second forming plate 54A. The second forming plate 54A is wound around the roller 59d and is raised upward by a rising portion 59e at a downstream position of the downstream end of the second forming plate 54A.
Is wound around the drive roller 59f and the tension adjusting roller 59h provided with the tension adjusting means 59g, from the outer position of the roller conveyor 51, and is wound around the drive roller 59f.
Accordingly, the drive can be performed so as to be synchronously set with the drive of the roller conveyor 51. As shown in FIG. 13, a support portion 59C that supports the rising roller portion 59c and that prevents friction between the return belt 59A and the conveyor roller 53 is disposed below the folding belt 59A.

FIG. 12 to FIG.
As shown in FIG. 3, the folding belt 59A is connected to the second forming plate 54A.
The folding belt 59A rising upward from the downstream winding roller 59d which is brought into contact with the upper surface of the second forming plate 5 in parallel with the second forming plate 5
4A, a plurality of pulling rollers 59j and 59k for pulling the roller from the outer position to the lower side of the roller conveyor 51.
The folding belt 59A, which has risen upward from 9d, is guided to the outside in the transport direction. Is done. The drawing rollers 59j, 59k are arranged so as to be height-adjustable by position adjusting means (not shown), and the positions of the drawing rollers 59j, 59k are set by the position adjusting means, thereby forming an endless Mobius strip. The winding state of the belt 59A can be adjusted, and the downstream winding roller 59d and the drawing rollers 59j, 59k
Are arranged such that the position in the conveying direction can be set by the position adjusting means, and the position setting is performed so that the glue margin P3 is folded upstream of the folding of the two-fold portion P2 during the conveyance.

As shown in FIGS. 12 and 13, the rising roller portion 59c includes two belt raising rollers 59n, 59n arranged in the transport direction, and the belt raising roller 5n.
9n, and an outer roller 59p disposed at an outer position of 9n. The folded belt 59A is pulled outward from between the two belt raising rollers 59n, 59n arranged side by side and wound around the outer roller 59p. It is arranged such that the position in the transport direction can be set by the position adjusting means, and the position is set so that the glue margin P3 is folded upstream of the folding of the two-fold portion P2 during the transport. You. The tension adjusting means 59g has a structure equivalent to that of the above-described tension adjusting means 48e.
It is assumed that the tension of A is adjusted.

As shown in FIG. 14, the driving roller 59f is connected to a variable speed V pulley 59q. The variable speed V pulley 59q is connected to a synchronization setting pulley 59r via an endless V belt 59s. Synchronization setting pulley 59r
The variable speed V pulley 59q and the synchronous setting pulley 59r are connected to the driving means of the roller
By changing between the state in which the variable speed V pulley 59q rotation speed shown in FIG. 14A is high and the state in which the variable speed V pulley 59q rotation speed shown in FIG.
9f is steplessly accelerated and shifted with respect to the driving means of the roller conveyor 51 so that synchronization can be set.

At the downstream side of the roller conveyor 51, FIG.
As shown in FIG. 5, a plurality of press rollers 51A and 51B for forming the folded paper cylinder T by sandwiching it from above and below, and a position setting means (not shown) for setting the press rollers 51A and 51B to predetermined positions. And are arranged,
At least one of the press rollers 51A has a folding line L3
A tapered roller having a tapered roller surface to partially press the portion is used.

As shown in FIGS. 1, 16 to 39, the bag bottom forming device 6 comprises a supply device 60A for continuously supplying the formed paper cylinders T at intervals, and a supply device 60A.
A folding line 610 provided at the end of the paper bag B and a bottom folded line L4 and a bottom folded line L5 near the bottom of the bag, which is the corner bottom of the paper bag B.
A bottom folding crease device 620 for making a fold, a bottom folding drum 640 for rotatingly transporting the paper cylinder T by rotation, and a bag of the paper cylinder T disposed close to the outer periphery of the bottom folding drum 640. A bottom opening device 630 that opens the bag bottom by adsorbing the bottom side, and a front folding flap T2 from a bottom return line L4 formed by the bottom folding creasing device 620 disposed close to the outer circumference of the bottom folding drum 640. Flap folding device 650 for folding back and forth each of the folding flaps T1 and T2 along the bottom folding drum 640, and a gluing device for gluing the front and back folding flaps T1 and T2. 660
And a flap raising device 670 for raising the front and back folding flaps T1 and T2, and a bag bottom folding device 680 for folding and sticking the front and back folding flaps T1 and T2.

The supply device 60A comprises, for example, a pair of left and right endless conveyor chains provided between a driving sprocket and a driven sprocket. The paper tube T is transported in the transport direction to the creasing bottom folding and sticking process of the next process. For example, a pair of upper and lower press rollers and a feed plate are disposed between the paper cylinder supply device 60A and the folding crease device 610, and the press rollers are rotated in opposite directions by a driving device. By narrowing the paper cylinder T, both sides of the paper cylinder T are pressed, and are transported on the feed plate to the folding crease device 610 in the next process.

As shown in FIG. 16, the folding crease device 610 includes, for example, a single plate-shaped creasing blade 611.
Rotating shaft 612 having a ridge and its creasing blade 61
A lower rotating shaft 614 provided with one receiving roller 613, and the creasing blade 611 is provided with an upper rotating shaft 612.
A transmission gear that meshes with a drive gear that branches and transmits rotation from a drive source is fixed to one side of the lower rotation shaft 614, and is fixed to one side of the lower rotation shaft 614. The lower rotating shaft 614 is driven to rotate via a gear, and the rotation is transmitted to the upper rotating shaft 612 via a plurality of relay gears fixed to the other side of the lower rotating shaft 614 and the upper rotating shaft 612. By rotating the upper rotating shaft 612 in the opposite direction to the lower rotating shaft 614, the creasing blade 611 is pressed against the bottom of the bag of the paper cylinder T sent from the paper cylinder supply device 60A to perform folding. When the fold is not performed, the creasing blade 611 can be removed. For example, a pair of upper and lower pinch rollers 615 and 616 and a feed plate 601 are arranged between the crease device 610 and the bottom crease device 620, and the pinch rollers 615 and 616 are mutually connected by driving means. By rotating in the opposite direction and narrowing the paper cylinder T, both sides of the paper cylinder T are pressed and transferred on the feed plate 601 to the bottom folding device 620 in the next step. .

The bottom crease device 620 has substantially the same configuration as the cut crease device 610. As shown in FIG. 16, the bottom crease device 620 has, for example, two flat plates. Upper rotating shaft 622 having creasing blades 621A and 621B, and creasing blades 621A and 62.
And a lower rotating shaft 624 having a 1B receiving roller 623. And the bottom creasing device 620
The upper rotating shaft 6 is similar to the above-described device for folding a crease 610.
The lower rotating shaft 624 is driven by rotating the lower rotating shaft 624 by a drive gear and a relay gear fixed to the lower rotating shaft 624 and transmitting the rotation to the upper rotating shaft 622. And upper rotating shaft 62
With the rotation of 2, the braided blades 621A and 621B are pressed against the bag bottom, which is on the front side in the transport direction of the paper cylinder T, so that the bottom folded line L4 and the bottom folded line L5 when the bottom is folded. Two parallel streaks are to be carved. In this case, depending on the position of each striped blade 621A, 621B, the bottom return line L
4 and the position of the bottom folding line L5, and the distance from the front end side of the paper cylinder T to the bottom folding line L4 is the length of each of the front and back folding flaps T1 and T2. T1 and T2 are the front and back folding flaps T1 and T2.
Bottom return line L to wrap each other when T2 is folded
The positions of the striped blades 621A and 621B are set so that the interval between the bottom line 4 and the bottom folding line L5 is longer than half the opening width of the paper cylinder T. As described above, in order to correspond to the sizes of various bag mouths, the creasing blades 621A and 621B of the bottom folding creasing device 620 are fixed to the concave portions 625 formed by cutting out the outer periphery of the mounting plate. One of the braided blades 621A is fixedly fastened, and the other braided blade 621B is mounted movably in the recess 625. Then, in this manner, the paper cylinder T containing the bottom return line L4 and the bottom return line L5 is turned by the rotation of each of the rotating shafts 622, 624 to open the bottom opening device 630.
The bottom opening device 630 side,
Pinch rollers 615 and 616 and a feed plate 601 are provided.

FIGS. 16 and 17 show the bottom opening device 630.
As shown in FIG. 5, for example, a rotating arc plate 632 fixed to the upper rotating shaft 631, a pressing plate 633 located on both outer sides of the rotating arc plate 632 and fixed to the upper rotating shaft 631,
Opening 6 formed by cutting out the outer peripheral surface of the rotating arc plate 632
34, a suction pad 635 attached to and fixed to the rotating arc plate 632, and an upper rotating shaft 6 of the rotating arc plate 632.
A lower rotating shaft 636 that forms a pair with the upper and lower members 31; Are operated by a configuration substantially similar to that of a later-described pressing claw 644 and a rear-raising claw 645 described later. The flap T2 is sucked, and the front side folding flap T2 of the paper cylinder T is fixed along the rotation path of the suction pad 635 attached to the rotating arc plate 632. At about the same time, the catch claw 641 provided on the bottom folding drum 640 disposed close to the bottom opening device 630 captures the front end of the back side folding flap T1 of the opened paper cylinder T at the bottom of the bag, and As shown in FIG. 17, the opening / closing pawls 637 and 643 are used to move the rear side of the bottom folding line L5 of the paper cylinder T to the folding portions T on both sides.
3, the upper rotation shaft 631 and the bottom folding drum 640 are rotated in opposite directions to open the bag bottom of the paper cylinder T.

As shown in FIGS. 16 to 20, the flap folding device 650 includes, for example, the bottom folding drum 640.
And a pair of left and right linear members 652 disposed between the left and right guide plates 651. The guide plate 651 is provided on a mounting rod 65 which is located on both sides of the paper cylinder T opened by the bottom opening device 630 and is provided above the bottom folding drum 640.
3 is fixed substantially horizontally via a mounting arm 654, and the linear member 652 is connected between the left and right guide plates 651 by the paper cylinder T.
Is fixed to the mounting rod 653 via a mounting arm 654 as a position for pressing the central portion of the base against the outer peripheral surface of the bottom folding drum 640. The left and right guide plates 651 have, for example, a flat plate portion 651a.
On one end side (bottom opening device 630 side), an inclined portion 651b gradually increasing toward the inner edge side is formed.
The other end of 1a is fixed to a mounting arm 654 so as to be in contact with the outer peripheral surface of the bottom folding drum 640. The linear member 652 includes a contact portion 652a brought into contact with the outer peripheral surface of the bottom folding drum 640, and a bottom opening device 6 for the contact portion 652a.
And a rising portion 652b vertically extending upward from the 30 side. Each guide plate 651 guides the paper cylinder T rotated and conveyed by the bottom folding drum 640 between each guide plate 651 and the bottom folding drum 640, and the front-side folding flap T sucked by the bottom opening device 630.
2 from the inclined portion 651 b of each guide plate 651 to the flat plate portion 65.
1a and by pressing against the linear member 652, the front folding flap T2 is turned upside down from the bottom turning line L4 by rotation of the bottom folding drum 640.
That is, only the front side folding flap T2 is turned upside down while the back side flap T1 is left, so that each of the front and back folding flaps T1 and T2 is flatly developed along the outer circumference of the bottom folding drum 640, and the guide plate 651 and the bottom folding Through a slight gap with the drum 640, the paper tube T is prevented from rising and is conveyed stably.

As shown in FIGS. 17, 19 and 20, the mounting rod 653 is capable of setting the mounting position along the outer peripheral surface of the bottom folding drum 640 via the mounting position setting means 655. The rotating shaft 65 attached to the main body frame M1 and the like and disposed at one end of the mounting rod 653
6 is rotatably mounted upward by an open position setting means 657, and is urged upward by a biasing member 658 such as a spring. The mounting arm 654 includes the mounting rod 6
A fixed position and a fixed direction are attached to 53 so as to be adjustable. As shown in FIGS. 19 and 20, the mounting position setting means 655 includes a mounting position setting surface 655A along the outer peripheral surface of the bottom folding drum 640, and a mounting moving portion 655B movable along the mounting position setting surface 655A. And the attachment moving section 65
Fixing part 655C such as a screw for fixing and releasing 5B
And a support portion 655D for supporting the open position setting means 657
The mounting position of the mounting rod 653 is set by moving the mounting moving portion 655B along the mounting position setting surface 655A as indicated by an arrow A in FIG. 20 according to the material and shape of the paper tube T. Then, it is fixed by the fixing portion 65C. The mounting position setting surface 655A is shaped to be equidistant from the rotation center of the bottom folding drum 640, and the movement locus of the mounting rod 653, that is, the guide plate 651
The movement trajectory of the linear member 652 can be integrally handled without the need for individual adjustment depending on the shape of the paper cylinder T. The opening position setting means 657 is configured as shown in FIG.
(B), as shown in FIG. 20, the rotation position of the mounting rod 653 by the rotation shaft 656 is set.
6 and a setting surface 657A arranged around
For example, a plurality of setting holes 657 disposed at A, for example, three places
B, an engaging member 657C disposed at one end of the mounting rod 653 and engaging the setting hole 657B to regulate the rotational position of the mounting rod 653, and the other end of the mounting rod 653 connected to the engaging member 657C. 657D for setting the position of the engaging member 657C, a connecting member 657E for connecting the engaging member 657C and the handle 657D, for example, located inside the mounting rod 653, and a setting hole for the engaging member 657C. And an urging member 657F such as a spring for urging toward the 657B side. By operating the handle 657D, the engaging member 657C is pulled out of the setting hole 657B against the urging force of the urging member 657F, and the mounting rod 653 is pulled out. By rotating with the rotation shaft 656 and engaging the engaging member 657C with the other setting hole 657B, the rotation of the mounting rod 653 as shown by a broken line in FIG. It is intended to set a position corresponding to location to location setting hole 657 b. As shown in FIG. 18, a press roller 659 is disposed in front of the flap folding device 650 in contact with the outer peripheral surface of the bottom folding drum 640.

The gluing device 660, as shown in FIG.
A tank 661 which is disposed on the outer periphery of the bottom folding drum 640 and in front of the press roller 659 and stores, for example, a starch paste or a chemical paste adhesive as shown in FIGS.
And a glue pad 665 on the outer peripheral surface made of synthetic rubber or the like.
Gluing roller 662 having an opening, and a tank 661 and an adhesive roller 66 facing the opening 663 of the tank 661.
2 and a tank 661 and a tray disposed below the relay roller 664. The adhesive in the tank 661 is glued through the relay roller 664. Glue pad 665 of mouth-ra 662
, And glued to each of the front and back folding flaps T1 and T2 by rotation of the gluing roller 662. The gluing roller 662 includes a pad setting sheet 666 for setting a gluing position when gluing the front and back folding flaps T1 and T2 with the gluing pad 665, and a mounting portion 667 for attaching the pad setting sheet 666 to the gluing roller 662. , 668. The pad setting sheet 666 has transparency as shown in FIG. 23A, and has, for example, a grid 666A for position setting on the entire surface, and as shown in FIG. In order to set the position of the gluing pad 665 in accordance with the dimensions of the tube T, the front and back folding flaps T1 and T2 are directly pressed against the opened paper tube T, and the surface of the pad setting sheet 666 to be the gluing position of the paper tube T 23, for example, with a double-sided adhesive tape or the like.
As shown in (c), it is wound around the gluing roller 662 and attached to the mounting portions 667 and 668 of the gluing roller 662 by the mounting holes 666a and 666b. As shown in FIG. 24, the attachment portion 667 is a pad setting sheet 666 attached by a biasing member 667a such as a spring inside a groove 662a provided in the gluing roller 662.
Has a mounting pin 667b which is urged in the direction in which the pulling force is applied. The gluing roller 662 is attached via an air cylinder 669. When the paper cylinder T is not on the bottom folding drum 640 due to a paper jam or the like, the air cylinder 669 is driven to move the gluing roller 662 upward. This prevents the glue from adhering to the bottom folding drum 640. Also, as shown in FIG.
It is also possible to adopt a configuration in which the gluing pad 665 is directly attached to the gluing roller 662.

As shown in FIGS. 16 to 18, 21, and 25 to 30, the bottom folding drum 640 is fixed to a mounting cylinder fixed to, for example, a rotating shaft 640A at appropriate intervals. It is composed of an aggregate of a plurality of divided drums 640B. For example, three aggregates of this aggregate are arranged. Each of the divided drums 640B is engaged with a catching claw 641 which is disposed on the outer periphery of the bottom folding drum 640 and sandwiches the tip of the back side folding flap T1 of the paper cylinder T, and the front and rear positions of the bottom folding line L4 of the back side folding flap T1. The front holding claws 642 and 642A and the opening / closing claw 637 of the bottom opening device 630
Opening and closing claw 64 for holding the paper cylinder T from the folding part T3 in accordance with
3, a rear holding claw 644 and a rear raising claw 645 located near the bottom return line L4 of the front folding flap T2, and a plurality of suction ports 646 for sucking the back folding flap T1. As shown in FIGS. 17, 18, 21, 25, 26, and 29, the catching claw 641 is located at the central portion in the axial direction of the bottom folding drum 640, and its tip portion 641a is divided from the groove. The rear side folding flap T1 is extended outside the outer periphery of the drum 640B, and is sandwiched between the tip end portion 641a of the catching claw 641 and the divided drum 640B. On the other hand, the front holding claws 642, 642A
Are fixed claws 64 fixed to the end of the divided drum 640B.
2A and the bottom folding drum 640 facing the fixing claw 642A.
A movable claw 642 is provided inside, and the opening and closing of the movable claw 642 sandwiches the front and rear sides of the bottom folding line L5 of the back side folding flap T1. A mounting bracket of the catching claw 641 and the front holding claw 642 is integrally mounted and fixed to a mounting cylinder of the rotating shaft 640A by a mounting bolt, and a shaft rotatably supported by each of the mounting brackets. The catching claw and the front gripping claw are integrally fixed to each other. At one end of the shaft of the catching claw 641 and the front holding claw 642, for example, a cam abutting portion provided with a rotating roller via a mounting arm is disposed, and the cam abutting portion is provided with the bottom folding drum. By moving along the cam surface fixed to the main body frame M1 at the side of 640, the catching claw 641 and the front holding claw 642 open and close. A clamp is integrally fixed to the shaft, and an L-shaped fixing bracket is fixed to the mounting bracket so as to face the clamp, and the cam abutment is provided between the fixing bracket and the clamp. A rod is provided with a spring that biases the part against the cam surface. Then, the catch claw 641 is formed on the projection formed on the cam surface.
And when each cam contact portion of the front holding claw 642 climbs up,
Capture claw 641 via rotating roller, clamp, and shaft
In addition, the front holding claws 642 open and close.

Further, on both sides of the bottom folding drum 640,
As shown in FIGS. 17, 18, and 21, for example, a rear holding claw 644 for pressing the front side position of the bottom folding line L5 of the front side folding flap T2 from above the front side folding flap T2.
And a rear-raised claw 645 located between the front-side folded flap T2 and the front surface of the paper cylinder T at a position behind the bottom fold line L5 of the front-side folded flap T2. As shown in FIG. 25 to FIG. 27, the pair of the back presser pawls 644 and the rear raiser pawls 645 are arranged in a pair in the width direction of the divided drum 640B, and are integrated with the rear presser claws 644 and the rear raiser pawls 645, respectively. The mounting brackets 644A and 645A are attached to the mounting brackets 644A and 645A, and are slidably guided and mounted on a supporting bracket 647 which is fixed to the mounting cylinder and rotates integrally with the bottom folding drum 640. Bracket 644A, 645
A movable shafts 644B and 645B rotatably supporting A,
A push-up lever 644C for rotating the rear holding claw 644 toward the bottom folding drum 640 or the rear raising claw 6
A pressing lever 645C for rotating the 45 toward the bottom folding drum 640 is provided. Each movable shaft 644B, 645
Each of the cams B has a cam contact portion 644D, 645D at its outer end, and the cam contact portions 644D, 645D are located on the side of the bottom folding drum 640 and are fixed to the main body frame M1. By moving along the surface, the rear holding claw 644 and the rear raising claw 645 reciprocate in the rotation axis direction of the bottom folding drum 640. Note that protruding cam contact portions 644E and 645E are provided at the tip of the push-up lever 644C or the push-down lever 645C, and a rotating roller or the like is attached to the tip of the cam contact portions 644E and 645E and the cam contact portions 644D and 645D. It is also possible to reduce friction with each cam surface. further,
As shown in FIG. 28, each movable shaft 644B, 64
5B, each movable shaft 64 is provided on the main body frame M1.
The first left and right cams 645G and the second left and right cams 644 contacting the cam contact portions 644D, 645D of the 4B, 645B.
G are fixed to the main body frame M1 at the outer sides on both sides of the bottom folding drum 640. The first and second left and right cams 644G, 645G are radially outside and inside from the axis of the bottom folding drum 640. The second upper and lower cams 64 contacting the cam contact portions 644E and 645E at the ends of the push-up lever 644C or the push-down lever 645C, respectively.
4H and a first vertical cam 645H are fixed integrally with, for example, the first and second left and right cams 644G and 645G. The first and second left and right cams 6
A third cam for operating the catch claw 641 and the like is fixed between 44G and 645G. As shown in FIGS. 27A and 27B, the movable shafts 644B and 645B are provided with concave portions 647 formed in the support bracket 647.
a by the springs 644F, 645F disposed in
And the first and second push-down levers 645C and 645C are pressed by springs pressed between the second left and right cams 644G and 645G and bridged between the mounting brackets 644A and 645A and the support bracket 647. The upper and lower cams 644H and 645H are configured to be pressed.

As shown in FIGS. 16 and 29 to 31, the flap rising device 670 includes, for example, two flat pushing blades 67 in front of the bottom folding drum 640.
The rotary shaft 672 provided with the rotary shaft 672 is driven laterally by a drive gear 672A connected in synchronization with the drive of the bottom folding drum 640. The pushing blade 671 is pressed along the bottom folding line L5 of each of the folding flaps T1 and T2 of the front and back sides of the paper cylinder T conveyed by the folding drum 640, and the front clamping that holds the vicinity of the bottom folding line L5 in an open state. Claws 642, 642
A is guided between A and between the back holding claw 644 and the back-raising claw 645. Then, after the catching claw 641 holding the back side folding flap T1 is opened, the front holding claw 6
42 is closed and the front folding flap T1 in a state where the back folding flap T1 is held by the back pressing claw 644 is raised by biting the front and rear of the bottom folding line L5 of the back folding flap T1, and the claw 645 is raised upward. By moving, the front and back folding flaps T1 and T2 are raised to be ready for folding by the bag bottom folding device 680.

As shown in FIGS. 16 and 31 to 38, the bag bottom folding device 680 folds the front and back folding flaps T1 and T2 raised by the pushing blades 671 and the like inside, and the bottom folding drum. 640 comprises a bottom bent bar 683 fixed to a pair of left and right chains 682 bridged over a front sprocket 681 and a bottom folded plate 684 provided with a slight clearance from the peripheral surface of the bottom folded drum 640. The front folding flap T2 is folded inward by a bottom folding bar 683, and the rear folding flap T1 is folded inward by a bottom folding plate 684. The bottom bent bar 683 is connected to the rotating shaft 681A of the sprocket 681 through the synchronization adjusting means 685 connected to the rotating shaft 681A.
, And rotationally driven by transmitting rotational driving force from the rotating shaft 672. As shown in FIGS. 31 to 33, the synchronization adjusting means 685 has a pair of elliptical gears 685A and 685B for increasing the moving speed of the bottom folding bar 683 when hitting the front folding flap T2, and the rotation of the pushing blade 671. The rotation driving force from the shaft 672 is transmitted to the rotation shaft 681A of the sprocket 681, and the rotation of the rotation shaft 672 of the pushing blade 671 synchronized with the rotation of the bottom folding drum 640, and the rotation of the sprocket 68
A planetary gear unit 686 for adjusting the state of synchronization with the rotation of one rotation shaft 681A is provided. The elliptical gear 685
A and 685B have a substantially elliptical outer periphery and a rotation center located at an eccentric position. Planetary gear unit 686
The sun gear 686A is fixed to the driving system, and a plurality of, for example, four planetary gears 686B are meshed around the sun gear 686A, and the planetary gear 686B is moved relative to the sun gear 686A. The planetary gear case 686C is rotatably and revolvably supported by the planetary gear case 686C, and the planetary gear case 686C is rotated integrally with an elliptical gear 685B connected to the rotating shaft 672 of the pushing blade 671. The gear 686B is meshed with an internal gear 686D located outside thereof, and the internal gear 686D is engaged with the sprocket 6
81, a drive gear 686E integrated with the rotation shaft 681A.
And the sun gear 686A is connected to the sun gear 6
Worm wheel 68 coaxial with 86A
The worm gear 686G meshes with the worm wheel 686F to regulate the rotation of the sun gear 686A. The synchronization adjusting means 685 controls the rotation driving force of the pushing blade 671 from the rotating shaft 672 through rotation of the sprocket 681 via the elliptical gears 685A and 685B, the planetary gear case 686C, the planetary gear 686B, the internal gear 686D, and the driving gear 686E. Transmitted to the shaft 681A,
At this time, by rotating the worm gear 686G, the sun gear 68
6A is rotated, and the rotation of the sun gear 686A changes the rotation state of the planetary gear 686B, the planetary gear case 686C, and the internal gear 686D, and the rotation of the pushing blade 671 even during the rotation of the bag bottom forming device 6. Axis 6
It is possible to adjust the synchronization state between the rotation of 72 and the rotation of the rotation shaft 681A of the sprocket 681, that is, the synchronization state of the rotation of the bottom folding drum 640 and the rotation of the bottom folding bar 683.

As shown in FIGS. 34 to 38, the bottom folded plate 684 is provided near the outer periphery of the bottom folded drum 640 by a position setting section 687 which can set the position according to the dimensions of the paper tube T and the like. Supported. The position setting unit 687 includes:
A support rod 687B, which is disposed in a substantially symmetrical shape below the bottom folding drum 640, and is laterally provided movably inside the long hole 687A, for example, in a long hole 687A provided on the left and right of the main body frame M1; A position adjusting screw 687C screwed to the support rod 687B, a worm wheel 687D connected to the position adjusting screw 687C as a rotation amount setting unit, and a worm gear 687E connected to the worm wheel 687D. A fixing means 687G for fixing the support rod 687B to the elongated hole 687A is provided. The left and right worm wheels 687D are connected by a connection rod 687F. The plate 684 is supported. The position setting unit 687 releases the fixing means 687G, rotates the worm gear 687E, rotates the position adjusting screw 687C via the worm wheel 687D, and rotates the inside of the elongated hole 687A into the support rod 6.
The position of the bottom folded plate 684 with respect to the bottom folded drum 640 can be set by moving the 87B in the direction indicated by the arrow S in FIG. Bottom bar 683 and bottom plate 684
As shown in FIG. 34 to FIG.
First, the paper tube T conveyed by the rotation of 0 is folded inside by hitting the front side folding flap T2 with the bottom folding rod 683 rotating at a higher speed than the rotation of the bottom folding drum 640 by the rotation of the chain 682. After that, the rotation of the bottom folding drum 640 causes the rear folding flap T in the upright state.
1 through the gap between the bottom folding plate 684 and the bottom folding drum 640 to be folded inward to form the front side folding flap T2.
It is to be folded inward so as to fold over.

The paper tube T with the folded flaps T1 and T2 folded up and down is transported by a transport path to the counting device 7, which has a rotary transport drum 690. As shown in FIG. 16 and FIG. 39, there are provided two endless belts 692 and 693 provided below the bottom folding drum 640 and spanning the rotary transport drum 690 and a plurality of guide rollers 691. The folding flaps T1 and T2, which are folded inward by the bottom folding bar 683 and the bottom folding plate 684, are respectively attached to the rotary transport drum 690 and a plurality of guide rollers 691 provided below the bottom folding drum 640. In addition to being transported by the two endless belts 692, 693 that have been bridged, the front and back folding flaps T1, T2 that have been glued in the previous step are attached. Note that a part of the one endless belt 692 is pressed against the outer peripheral surface of the bottom folding drum 640. The endless belts 692 and 693 are
The paper tube T in a state where the front and back folding flaps T1 and T2 are folded is sandwiched between the base folding drum 92 and the bottom folding drum 640, and the front and back folding flaps T1 and T2 are glued. The paper cylinder T in which the folding flaps T1 and T2 are folded is attached to the bottom folding drum 640 and the endless belts 692 and 693.
, And is transported to the rotary transport drum 690. The rotary transport drum 690 and the rotary transport drum 69
The other endless belt 693 bridged over the belt 0 conveys the paper cylinder T to the supply position of the counting device 7 in the next process. As shown in FIG. 39, the endless belt 693 is provided with an intermediate bag discharging means 694 on the counting device 7 side, and the intermediate bag discharging means 694 is wound around the endless belt 693 and is movable. A movable roller 694A, and a discharge plate 694B that discharges the paper tube T in a moving direction of the movable roller 694A in accordance with the movement of the movable roller 694A;
A driving means 694C such as an air cylinder for driving the discharge plate 694B in the moving direction is provided. The movable roller 694A is supported by a movable arm 694E rotatable by a shaft 694D, and the driving of the movable arm 684E and the driving of the discharge plate 684B are synchronized, and are conveyed by the endless belts 692, 693. Defective or inspected products among the paper cylinders T can be ejected in the middle.

As shown in FIG. 1, the counting device 7 uses front and back folding flaps T1, T by a bag bottom folding device 680.
A drum 71 that transports the folded paper cylinder T, a press roller 72 that presses the folded front and back flaps T1 and T2 to form the square bottom B1 of the paper bag B, and a count of the formed paper bag B And a product table 73 on which the paper bags B are arranged.

Hereinafter, the manufacture of a paper bag in the bag making machine M configured as described above will be described.

First, the bag paper P cut to a predetermined size in advance
Are continuously supplied by the paper feeding device 1 at intervals and fed to the handle device 2, and the pinch rollers 20A and 20B are rotated in opposite directions by driving means to narrow the bag paper P, P is pressed on both sides to feed the top of the feed plate 20C to the cutter unit 22. In the cutter unit 22,
The rotation from the drive source is transmitted by a transmission gear meshing with the drive gear to drive the lower rotation shaft 22D to rotate, and the rotation is transmitted to the lower rotation shaft 22D and the upper rotation shaft 22B. The rotation is transmitted to the upper rotation shaft 22B via a gear, and the upper rotation shaft 22B is rotated in a direction opposite to that of the lower rotation shaft 22D.
Then, the cutter 22A is brought into contact with the blade receiving portion 22C,
As shown by (b) in FIG. 40 (a), the handle portion H2 of the handle H at the time of folding is cut into a substantially J-shaped and a substantially inverted J-shaped cut J located outside the bent portion P4. When the paper cylinder T is formed, the cutter of the upper rotary shaft 22 </ b> B cuts the end of the folded part P <b> 4 on the front side and the cut part K. Next, the bag paper P engraved with the cut J is transferred to the sticking drum 21 by the pinch rollers 20A and 20B and the advance roller 29A. In the sticking drum 21, the catching claw 21C is rotated by the shaft 21Ca. As shown in FIG. 3A, the bag paper P is sandwiched between the tip end of the catching claw 21C and the outer periphery of the attaching drum 21 and is rotated and transported along the outer periphery of the attaching drum 21A. In this state,
The bag paper P is glued by the first gluing section 27, and the handle H formed by the handle forming section 24A of the handle supply section 24 is driven to the glued sticking position by the winding roller 24C of the handle transport section 24B. Endless belt 24
D, the handle H is attached to the attaching drum 21.
Is supplied to the bag paper P located on the outer periphery of FIG.
After the handle H is pasted as shown in (c), the second pasting unit 28 pastes the handle H on the sticking paper H1.

At this time, in the gluing section 23, by setting the positions of the gluing pads 27B and 28B, FIG.
As shown in (a), the first gluing section 27 places the bag paper P on the side where the bag bottom is formed from the fold line L6 of the bag paper P.
Is glued to the bag paper gluing position N which is located over substantially the entire width of the bag paper, and as shown by (e) in FIG. The setting is made so that the surface of the sticking portion H1 of the handle H is glued. Alternatively, the gluing section 23 is provided with the gluing pads 27B, 2
By setting the position of 8B, as shown by (a) in FIG.
No. 1 is pasted to the bag sheet pasting position N3, which is the pasting position N2 of the folded part P4 except for the pasting position N1 and the portion corresponding to the pasting position N1, and as shown in FIG. Alternatively, it is possible to set the second gluing unit 28 to glue the surface of the sticking unit H1 of the handle H stuck to the bag paper P. 42. Alternatively, the gluing unit 23 sets the positions of the gluing pads 27B and 28B, and
As shown in (a) in (a), the first gluing unit 27 glues the bag paper to the gluing position N4 corresponding to the gluing position of the gluing unit H1 of the handle H, and FIG.
As shown in (e) in (b), the second gluing section 28 places the bag paper P on the side where the bottom of the bag is formed from the surface of the sticking portion H1 of the handle H attached to the bag paper P and the cut line L6.
Can be set so that gluing is performed at the fold part gluing position N5 located over substantially the entire width of.

At substantially the same time as the gluing by the second gluing section 28, as shown in FIG. 3B, the pushing blade 2 of the folding means 25 disposed on the rotating shaft 28F of the second gluing section 28.
5A is a folding line L of bag paper P conveyed by the attaching drum 21
6 and is guided between the holding claws 21D and 21E, which hold the vicinity of the fold line L6 of the bag paper P in an open state, to raise the fold part P4. Then, as shown in FIG. 3 (c), the holding claws 21E are closed and the fold line L of the bag paper P is closed.
The bite P6 is raised by biting around 6
The jaw plate 21F is rotated by the rotation of the pushing blade 25A to rotate the jaw plate 21F in the state in which the bag paper P is bitten by the sandwiching claws 21D and 21E, so that the bend portion P4 is formed by the leading end portion Fb. As shown by (d) in FIG. 42 (b), the fold part P4 is folded from the fold line L6.

Next, after the bag paper P folded in the fold P4 is pressed against the sticking drum 21 by the press roller 29B, the leading end of the bag paper P in the conveying direction is attached to the sticking drum 21.
Of the delivery roller 26A, the catching claw 21C of the delivery roller 26A is released, and is caught by the catching claw 26b disposed on the outer periphery of the delivery roller 26A.
6a presses the fold P4 to form the fold P4.
Are pasted together. Further, the press roller 26E presses only the fold P4 with the press pad 26c, so that, for example, the handle portion H2 of the handle H is not pressed, and a portion serving as the bag mouth of the paper bag B is formed. To the creasing device 3. At this time, the synchronization setting means 21G, 2
With 6F and 26G, folding can be performed according to the dimensions of the bag paper P and the paper tube T.

Next, the convex roller 31 and the concave roller 32 of the creasing device 3 use the creasing roller 31 and the creasing roller 32, respectively, as shown in FIGS.
As shown in (d), two sets of fold lines L1, fold lines L2, and fold lines L3 are engraved on the bag paper P.

Next, the bag paper P is sandwiched and folded from the folding line L1 and the folding line L2 by the first folding section 42 of the paper tube forming apparatuses 4 and 5, and the folding line is formed by the second folding section 52. The bag paper P is folded in two along L3 to form a paper cylinder T.

Here, the bag paper P is transported by the roller conveyor 41, and the position of the bag paper P is detected by the gluing device 49 by the detecting means on the paper feeding device 1 side of the first folding section 42 by the detecting means. The control unit to which the detection result is input controls the glue spray, the glue supply unit, and the pressurizing means, and as shown in (f) in FIG. 43 (c), is substantially parallel to the folding line L1 of the bag paper P. Is applied to the end of the two-fold part P2.

Further, when the bag paper P is transported by the roller conveyor 41, the lower feed belt 46a of the attitude setting / transporting means 45 is driven in synchronization with the roller conveyor 41, and the tension of the upper feed belt 46b is adjusted by a tension adjusting device. 48e, and the upper feed belt support 48 is driven by the vertical drive means 48f to bring the upper feed belt 46b into substantially contact with the lower feed belt 46a.
The upper feed belt 46b is pressed against the lower feed belt 46a by d, and the upper feed belt 46b is driven by friction with the lower feed belt 46a supported by the lower feed belt support means 47. The upper feed belt 46b and the lower feed belt 46a hold and transport the bag paper P from above and below, and set the posture of the bag paper P being transported to the first folding section 44. At this time, the upper feed belt 46
b, the length in the transport direction is set to be longer than the length in the transport direction of the bag paper P, and the width dimension of the lower feed belt 46a is
Since the width of the upper feed belt 46b is set to be larger than the width of the upper feed belt 46b, there is a portion where the upper feed belt 46b and the lower feed belt 46a are in contact with each other without the bag paper P interposed therebetween. Thus, the bag paper P can be transported.

Roller conveyor 41 and upper feed belt 46b
By transporting the bag paper P by the lower feed belt 46a and the lower feed belt 46a, the folding part P1 is sandwiched by the first folding part 44, and is folded from the folding line L1 as shown by (g) in FIG. As shown by (h) in FIG. 43 (c), it is folded back from the folding line L2. At this time, bag paper P
Is located between the conveyor roller 43 and the first forming plate 44A, which is conveyed in the direction of arrow A and folds the bag paper P corresponding to the inside position above the fold line L1, as shown in FIG. As a result, the folding position of the folding part P1 upward from the folding line L1 is set, and the flip-up part 44B located outside the first forming plate 44A folds from the folding line L1 as shown by an arrow X in FIG. The portion P1 is flipped up, and by the fold push plate 44C connected to the flip-up portion 44B,
As shown by an arrow Y in FIG.
1 is folded over the first forming plate 44A,
By being located between the first forming plate 44A and the crimping plate 44C, the folding position of the folding part P1 upward from the folding line L2 is set, and as shown by the arrow Z1 in FIG. The folded portion P1 is folded upward from the folded line L2 by the vertical plate portion 44Da of the fold holding portion 44D located above and inside 44C, and as shown by the arrow Z2 in FIG. Folding part P1
Is folded outward from the folding line L2, and the horizontal plate portion 44Db
Has a slope so as to approach the fold plate 44C in the downstream direction, so that the folded portion P1 is located between the horizontal plate portion 44Db and the fold push plate 44C as shown by an arrow W in FIG. As a result, the folding position is set upward from the folding line L2 of the folding portion P1, and the bag paper P is folded.

The bag paper P folded by the first folding section 44 sandwiches the folded or folded bag paper P from above and below by press rollers 41A and 41B arranged downstream of the roller conveyor 41. While being pressed, it is sent to the second folding process section 52. At this time, at least one of the press rollers 41A is a taper roller having a tapered roller surface, so that the folded line L1 or the folded line L2 can be partially pressed.

The bag paper P folded from the fold line L1 and the fold line L2 is supplied to the roller conveyor 51, the upper feed belt 56b, and the lower feed belt in the second folding section 52 in the same manner as in the first folding section 42. 56a, and also by the folding belt 59A.
As shown in (d), the folding line L is
3, the folded portion P2 is folded back in two, the glue margin P3 is folded, and the folded portion P3 is folded.
2 and the paste margin P3. Second folding section 54
As the bag paper P is conveyed, the bag paper P is located between the second forming plate 54A for folding the bag paper P and the conveyor roller 53 corresponding to the inner position above the folding line L3. Thereby, the folding positions of the two-fold part P2 and the glue margin P3 upward from the folding line L3 are set,
Further, an upstream winding in which the folding belt 59A is wound at an upstream end position of the second forming plate 54A at an outer position below the folding line L3 and parallel to the lower surface of the second forming plate 54A. Rising roller portion 59c in the downstream direction from roller 59a
, The two-fold part P2 and the margin P3 of the bag paper P rise from the folding line L3 by being twisted upward and rising in the vertical direction above the folding line L3.
In addition, the folding belt 59A is provided with the rising roller portion 59c.
From the rising state to the downstream winding roller 59d in a downwardly twisted state from the rising state to the abutting position in a state parallel to the upper surface of the second forming plate 54A. Folded part P2 on top
And the glue margin P3 are folded back, and the two-fold part P2 and the glue margin P3 are joined to the second forming plate 54A and the folding belt 59A.
, The bag paper P is folded in two, and the glue margin P3 is attached.

At this time, the driving roller 59f is connected to the variable-speed V pulley 59q and the synchronous setting pulley 59r, for example, as shown in FIG.
By setting the state shown in FIG. 14B to be changed from the state shown in FIG. 14A to the state shown in FIG. By setting the speed to be relatively early, the speed at the time of folding back of the two-fold part P2 becomes:
For example, it is set so as not to be delayed with respect to the moving speed of the bag paper P.

The bag paper P, which has been folded and attached in two folds by the second folding section 54, is transferred to the roller conveyor 51.
On the downstream side of the press roller 51A, 51B
The paper cylinder T is formed by partially pressing the fold line L3 in particular from the vertical direction.

Next, the paper cylinder T is conveyed to a pair of upper and lower press rollers by feed pawls attached to the conveyor chain of the bag bottom forming apparatus 6, and both sides of the paper cylinder T are pressed by the press rollers. The tube T is conveyed to the folding crease device 610 in a state of being folded flat. When the upper rotary shaft 612 is rotated, the creasing blade 611 provided on the upper rotary shaft 612 is pressed against the paper cylinder T conveyed from the press roller by the rotation of the upper rotary shaft 612 toward the rear bag opening of the paper cylinder T to perform folding. Engrave the fold. Note that the fold near the bag opening does not need to be engraved, and in this case, the scoring blade 611 may be removed. Then, each of the rotating shafts 612 and 614 is rotated to transfer the paper tube T to the bottom creasing device 620 in the next step. Here, similarly to the folding crease device 610, each rotating shaft 62
2, 624, and the creasing blades 621A, 621B near the bottom of the bag, which is on the front side in the transport direction of the paper tube T.
Fold line L4 and bottom fold line L5 for bottom folding
The two parallel lines are carved.

Thereafter, the paper tube T containing the bottom return line L4 and the bottom return line L5 is transferred to the bottom opening device 630 by the rotation of each of the rotating shafts 622 and 624, and the suction paper 635 is used to transfer the paper cylinder T to the front paper. The front end side is sucked, and the front end of the back side of the paper cylinder T is sucked by the suction port 646, and as shown in FIG. 17, the bag bottom of the paper cylinder T is opened along the rotation path of the suction pad 635, At the same time, the opening / closing claw 637 of the bottom opening device 630 and the opening / closing claw 643 of the bottom folding drum 640 hold the folded portion T3 of the paper cylinder T, and the bottom opening device 630
Claw 6 provided on bottom folding drum 640 disposed close to
By 41, the front end of the back side paper side of the opened paper cylinder T at the bag bottom, that is, the back side folded flap T1 is held. On the other hand, the rear holding claw 644 and the rear raising claw 645 keep the rear holding claw 644 and the rear raising claw 64 until the holding claws 641 sandwich the paper tube T.
5, the movable shafts 644B and 645B fixed to the mounting brackets 644A and 645A are located outside the bottom folding drum 640 without being in contact with the first and second left and right cams 644G and 645G by the springs 644F and 645F. After that, the holding claw 644 and the back-raising claw 645 are combined with the push-up lever 644 provided on the mounting brackets 644A and 645A for the back holding claw 644 and the back-raising claw 645.
C and the cam contact portion 644E of the push-down lever 645C,
645E are the first and second vertical cams 644H, 64
Each mounting bracket 644 is placed in a state where it does not come into contact with 5H.
A, 645A and the supporting bracket 647 cause the rear holding claw 644 and the back-raising claw 645 to contact the bottom folding drum 640 by the biasing force of the spring between the supporting bracket 647 and the outside of the paper cylinder T held down by the catching claw 641. It is held in a state where it is located. When the paper tube T is nipped by the catching claws 641, the first
The movable shaft 645B is pushed inward by contacting the protruding portions of the left and right cams 645G, and the rearwardly raised pawl 645 is pressed against the urging force of the spring 645F, that is, the paper is suppressed by the catching pawl 641. Overhang above the tube T. On the other hand, a push-down lever 645C fixed to the movable shaft 645B
Is in a state of not contacting the first vertical cam 645H by a spring, but is pushed back and forth by the first vertical cam 645H before and after the upwardly extending paper cylinder T suppressed by the catching claws 641 of the rearward raising claws 645. When the lower lever 645C comes into contact with the movable shaft 645B, the movable shaft 645B rotates reciprocally. With the rotation of the movable shaft 645B, the rearwardly raised pawl 645 rotates upward, and then rotates downward. Contact with the surface paper. At this time, as shown in FIG.
Reference numeral 5 is located behind the bottom folding line L5 of the front folding flap T2 and above the front surface paper of the paper cylinder T. At this time, the rear holding claw 644 is in a standby state in a state in which it comes into contact with the bottom folding drum 640 and is positioned outside the paper cylinder T suppressed by the catching claw 641.

In this state, the bag bottom of the paper cylinder T is opened by rotating the upper rotating shaft 631 and the bottom folding drum 640 in mutually opposite directions. In this manner, the bottom of the opened paper cylinder T is guided between the guide plates 651 and the bottom folded drum 640 constituting the flap folding device 650 by the rotation of the bottom folded drum 640. Then, only the front side folding flap T2 is folded back to the front side paper of the paper tube T, the rearward raising claw 645 is located between the front side paper of the paper cylinder T and the front side folding flap T2, and the folding part T3 by the opening and closing claw 637 is provided. Is released, and the folding flaps T1 and T2 of the front and back sides of the paper cylinder T are spread flatly along the outer periphery of the bottom folding drum 640, and the bottom folding drum 640 is opened.
The paper tube T is conveyed by the rotation of. The intermediate flaps T1 and T2 are pressed by a press roller 659 in the course of this conveyance to be shaped. At this time, FIG.
Since the back holding claw 644 is not provided below the front side flap T2 which becomes the bottom side line B3 of the paper bag B, the bottom side line B3 can be reliably formed. This press roller 659
At the same time as pressing the paper cylinder T, as shown in FIG.
The rear holding claw 644 that is in contact with the bottom folding drum 640 and stands by outside the paper cylinder T held down by the catching claw 641 has a movable shaft 644B whose protruding portion of the second left and right cams 644G causes the movable shaft 644B to move. When pressed inward, the back presser pawl 644 protrudes inward, that is, above the paper cylinder T held down by the catching pawl 641, against the urging force of the spring 644F. On the other hand, the push-up lever 644C fixed to the movable shaft 644B of the rear holding claw 644 is moved by the second vertical cam 64 by a spring.
4H, but at the same time that the back presser pawl 644 protrudes above the paper cylinder T suppressed by the catching pawl 641, and at the same time, the push-up lever 644C comes into contact with the second vertical cam 644H to move the movable shaft. 644B rotates reciprocally, and with the rotation of the movable shaft 644B, the back presser pawl 644 rotates upward and then downward, and the paper cylinder T
Contact the front side flap T2.

Thereafter, the paper cylinder T is conveyed by the rotation of the bottom folding drum 640, and the gluing roller 662 is rotated as shown in FIGS. 21 and 22, whereby the glue shown in FIG. The gluing pad 665 glues the front and back folding flaps T1 and T2 to the position. After the gluing step is completed, the rotation shaft 672 of each pushing blade 671 of the flap rising device 670 is rotated, so that each of the pushing flaps T1 and T2 along the bottom folding line L5 of the folding flaps T1 and T2. The pushing blade 671 bites, and as shown in FIG. 29, the bottom folding line L of the back side folding flap T1 is formed.
5 is held between the front holding claws 642 and 642A holding the open state, and thereafter, as shown in FIG.
The push-in blade 671 rotated by 72 causes the bottom folding line L5 of the front-side folding flap T2 to be raised up and the pawl 64.
5 and the rear holding claw 644 are guided toward the rear raising claw 645 side. Then, the catching claw 641 moves upward along the protruding portion formed by the rotating roller on the cam surface, moves away from the back side folding flap T1 gripped up to that time, and the rotating roller of the front holding claw 642 , The front holding claws are closed by the biasing force of the spring, thereby biting the front and rear of the bottom folding line L4 of the back side folding flap T1, and the opening / closing claw 643 is separated from the folding part T3. The push-down lever 645C fixed to the movable shaft 645B of the rearward-raising claw 645 is used for the second vertical cam 64.
5H, the movable shaft 645B rotates reciprocally, and the rearwardly raised claw 645 rotates upward with the rotation of the movable shaft 645B, whereby the bottom fold line L5 of the front fold flap T2 is formed. Rear holding claw 6 on front side
44, and raises the rear side of the bottom folding line L5 with the claw 645. With this, the front and back flaps T
1 and T2 are folded inward from the bottom folding line L5.

Then, as shown in FIG. 34, the paper tube T in which the front and back fold flaps T1 and T2 are folded is first brought into contact with the bottom fold bar 683 by the rotation of the chain 682 to make contact with the front fold flap T2. Front side flap T
35, the back folding flap T1 is folded inward by the bottom folding plate 684 as shown in FIG. 35, and the bottom folding flap T1 is conveyed by the bottom folding drum 640 as shown in FIG. The back side folding flap T1 is folded on the front side folding flap T2 by passing between the bottom folding drum 640 and the bottom folding plate 684. Thereafter, the two endless belts 69 laid over a plurality of guide rollers 691
2 and 693, the paper tube T is narrowed between the front and back sides so that the folding flaps T1 and T2 on the front and back sides are overlapped.
In 693, the sheet is transported to the supply position of the press machine 7 in the next process. On the way,
Each of the folded flaps T1 and T2 folded by the press roller 72 is pressed to form a square bottom portion B1 of the paper bag B, and finally the formed paper bag B is counted by the counting section. Line up.

As shown in FIG. 45, the folded portion 59 is moved from the outside position of the second forming plate toward the downstream side.
The folded portion C2 may be arranged in a folded state so as to overlap the upper position and fixed to fold the two-folded portion P2 and the glue margin P3.

[0078]

According to the bag making machine and the bag making method of the present invention, the following effects can be obtained. (1) Since the rear holding claw presses the front side of the bottom fold line of the front side folding flap while holding down the front side of the bottom fold line, the rear fold claw raises the rear side of the bottom folding line of the front side folding flap. (2) Since the front-side folding flap is lifted from the lower side without being bitten and raised, it is possible to prevent the front-side folding flap from being damaged by biting. (3) When the press is performed by the press roller, the back holding claw is not located at the position where the bottom side line of the paper bag is formed between the press roller and the bottom folding drum, so that the accuracy in setting the bottom side line can be improved. . (4) At the time of gluing by the gluing roller, the front and back folding flaps to be glued are sandwiched not only by the catching claws but also by the back pressing claws, so that the gluing to the folding flaps on both sides can be performed accurately. (5) As described above, since the accuracy of the product can be improved, the yield in the manufacture of the square bottom paper bag can be improved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of a bag making machine and a bag making method according to the present invention.

FIG. 2 is a front view showing a handle device in the bag making machine of FIG.

FIG. 3 is a front view showing a step of folding a sticking drum in the handle device of FIG. 2;

FIG. 4 is a perspective view showing a sticking drum and a gluing section in the handle device of FIG. 2;

FIG. 5 is a perspective view of the handle device of FIG. 2, in which a part of a sticking drum and a pressing means is not shown.

6 is a perspective view showing a sticking drum of the handle device of FIG. 2 and synchronization setting means in the pressing means.

FIG. 7 is a perspective view showing a creasing device in the bag making machine of FIG.

FIG. 8 is a front view showing a first folding step of the paper tube forming device in the bag making machine of FIG. 1;

9 is a partially sectional side view showing a posture setting and conveying means in a first folding step part of FIG. 8;

FIG. 10 is a perspective view showing a first folding part in a first folding step part of FIG. 8;

FIG. 11 shows a second example of the paper cylinder forming apparatus in the bag making machine of FIG.
It is a front view which shows a folding process part.

FIG. 12 is a front view (b) showing a folding section in a second folding process section in FIG. 11 and a plan view (a) showing a folded belt.
It is.

FIG. 13 is a perspective view showing a folded belt of a second folding section in the second folding section of FIG. 11;

14 is a perspective view showing a change in a driving state of a V-belt pulley that drives a folding belt in a second folding process unit in FIG. 11;

FIG. 15 is a perspective view showing a step of folding bag paper in the first folding section shown in FIG. 8;

FIG. 16 is a front view showing a bag bottom forming device in the bag making machine of FIG. 1;

17 is a perspective view showing a state in which the bag opening of the paper cylinder is opened by the bottom opening device and the flap folding device in the bag bottom forming device of FIG. 16;

18 is a perspective view showing a deployed state of the front and back folded flaps of the paper cylinder by the flap folding device in the bag bottom forming apparatus of FIG. is there.

19 is a partially sectional side view showing a mounting rod and a mounting position setting means of the flap folding device in the bag bottom forming device of FIG.

20 is a perspective view showing an attachment position setting unit and an open position setting unit of FIG. 19;

FIG. 21 is a perspective view showing a gluing device in the bag bottom forming device of FIG. 16, and showing positions of a back pressing claw and a rear raising claw.

FIG. 22 is a front view showing a gluing device in the bag bottom forming device of FIG.

23 is a perspective view showing the pasting of a pasting pad to a pasting roller and a pad setting sheet in the pasting device of FIG. 22;

24 is a front sectional view showing a mounting portion of a gluing pad in the gluing roller of FIG. 22.

25 is a front view showing a bottom folding drum, a catching claw, a front holding claw, a rear holding claw, and a rear raising claw in the bag bottom forming apparatus of FIG. 16;

26 is a developed plan view showing a bottom folding drum, a catching claw, a front holding claw, a rear holding claw, and a rear raising claw in the bag bottom forming apparatus of FIG.

FIG. 27 is a side view of a part of a rear holding claw and a rear raising claw in the bag bottom forming device of FIG.

FIG. 28 is a view showing the first and second units in the bag bottom forming apparatus shown in FIG. 16;
FIG. 2 is a front view showing the left and right cams and the up and down cams.

FIG. 29 is a front view showing a flap rising device in the bag bottom forming device of FIG. 16 and a rising state of a back side folding flap of a bottom folding drum, a catching claw, a front holding claw, a back holding claw, and a rear raising claw. .

30 is a front view showing a flap rising device and a rising state of a front side folding flap of a bottom folding drum, a catching claw, a front holding claw, a rear holding claw, and a rear raising claw in the bag bottom forming device of FIG. 16; .

FIG. 31 is a side view showing a flap rising device and a bag bottom folding device in the bag bottom forming device of FIG.

FIG. 32 is an enlarged side view showing the synchronization adjusting means in the bag bottom folding device of FIG.

FIG. 33 is an exploded perspective view showing an elliptical gear and a planetary gear unit in the synchronization adjusting unit of FIG. 32.

FIG. 34 is a front view showing the bag bottom folding device and the folded state of the front side flaps of the bottom folding drum, the front holding claws, the rear holding claws, and the rear raising claws in the bag bottom forming device of FIG. 16;

35 is a front view showing the bag bottom folding device in the bag bottom forming device of FIG. 16 and the folded state of the back side folding flaps of the bottom folding drum, the front holding claws, the rear holding claws, and the rear raising claws.

36 is a front view showing the folded state of the front and back folding flaps of the bag bottom folding device and the bottom folding drum, the front holding claws, the rear holding claws, and the rear raising claws in the bag bottom forming device of FIG. 16;

FIG. 37 is a front view showing a bottom folded plate and a position adjusting unit in the bag bottom folding device in the bag bottom forming device of FIG. 16;

FIG. 38 is a side view showing a bottom folded plate and a position adjusting unit in the bag bottom folding device in the bag bottom forming device of FIG.

39 is an enlarged front view showing an endless belt and a midway bag discharging means in the rotary transport drum in the bag bottom forming device of FIG. 16;

FIG. 40: Cut and gluing of a handle to bag paper in a bag making machine and a bag making method according to an embodiment of the present invention (a), and sticking and folding back of the handle (b)
FIG.

FIG. 41 shows another embodiment of the bag making machine and the bag making method according to the present invention, in which a handle is cut and glued on bag paper (a), and a handle is attached and folded back (b).
FIG.

FIG. 42 is a perspective view showing cutting and gluing (a) for a handle to bag paper and attaching and folding back the handle (b) in another embodiment of the bag making machine and the bag making method according to the present invention. is there.

FIG. 43 shows a method (c) and (d) for forming a paper cylinder from bag paper in one embodiment of the bag making machine and the bag making method according to the present invention.
FIG. 7 is a perspective view showing a method (e), (f), and (g) of forming a paper bag from a paper cylinder.

FIG. 44 is a perspective view showing a square bottom paper bag manufactured by one embodiment of the bag making machine and the bag making method according to the present invention.

FIG. 45 is a perspective view showing another embodiment of the paper tube forming apparatus.

FIG. 46 is a perspective view showing another embodiment of the gluing device.

FIG. 47 is a perspective view showing the formation of a conventional paper bag.

[Explanation of symbols]

 M: Bag making machine M1: Body frame P: Bag paper P1: Folding part P2: Folded part P3: Glue margin P4 ... Folding part T: Paper cylinder T1: Back side flap T2: Front side flap T3: Folding part B: paper bag B1: square bottom portion B3: bottom side line H: handle H1: sticking portion (sticking paper) H2: handle portion J: cut K: cut portion N, N3, N4: glue position L: streak L1 ... folding line L2 ... folding line L3 ... folding line L4 ... bottom folding line L5 ... bottom folding line, 1 ... paper feeder 2 ... handle device 20A, 20B ... pinch roller 20C ... feed plate 21 ... sticking drum 21a ... drive gear 21A: rotating shaft 21B: split drum 21C: catching claw 21Ca: shaft 21D: fixed claw (clamping claw) 21E: movable claw (clamping claw) 21F: jaw plate 21Fa: rotating shaft 21Fb: tip 21G: synchronization setting hand 21Ga movable slot 21Gb synchronization setting gear 22 cutter 22A cutter 22B upper rotating shaft 22C blade receiving portion 22D lower rotating shaft 23 gluing portion 24 handle supply portion 24A handle forming portion 24B handle transfer Part 24C ... Winding roller 24D ... Endless belt 25 ... Folding means 25A ... Pushing blade 26 ... Pressing means 26A ... Delivery roller 26Aa ... Drive gear 26B ... Roller 26C ... Upper rotating shaft 26D ... Lower rotating shaft 26E ... Press roller 26F: Synchronization setting means 26Fa: Synchronization setting rod 26Fb: Slot 26Fc: Synchronization setting gear 26G: Synchronization setting means 26Ga: Synchronization setting gear 26GAb: Relay gear 26a: Press pad 26b: Capture claw 26c: Press pad 27: First gluing Part 27A… Tank 27B… Glue pad 2 7C: gluing rollers 27D, 27E: relay roller 28: second gluing section 28A: tank 28B: gluing pad 28C: gluing rotating section 28D, 28E: relay roller 28F: rotating shaft 29A: advance roller 29B ... press roller 3 ... Apparatus 31 ... Convex roller 31a ... Convex ridge 32a ... Groove groove 32 ... Concave roller with crease 4 ... Paper cylinder forming apparatus F ... Conveying surface 41A, 41B ... Press rollers 41a and 41b ... Both ends 41 ... Roller conveyor 42 ... 1 Folding process part 43 Conveyor roller 43b Frame 44 First folding part 44A First forming plate 44B Folding part 44C Fold pressing plate 44D Fold holding part 44Da Vertical plate part 44Db Horizontal plate part 45 ... Posture setting conveying means 46... Feed belt 46 a... Lower feed belt 46 b. .., Driving means 46e, lower feed belt tension adjusting means 47, lower feed belt support means 47a, 47b, winding roller 48, upper feed belt support parts 48a, 48b, 48c, upper feed belt roller 48d, pressing means 48e, tension adjustment Means 48f Vertical driving means 48g Shaft 48h Crimping arm 48j Urging member 48k Support rod 48m Fastening means 48n Moving shaft 49 Gluing device 5 Paper cylinder forming device 51 Roller conveyor 51A, 51B Press Rollers 51a, 51b Both ends 52 Second folding section 53 Conveyor roller 54 Second folding section 54A Second forming plate 54B Guide section 55 Posture setting conveyance means 56 Feed belt 56a Lower feed belt 56b: upper feed belt 57: lower feed belt support means 57a, 57b: winding roller 58: upper feed belt G support parts 58a, 58b, 58c: upper feed belt roller 58d: pressing means 58e: tension adjusting means 58f: vertical driving means 58g: shaft 58h: crimping arm 58j: urging member 59: folding part 59A: folding belt 59C ... Supporting part 59a ... Upstream winding roller 59b ... Rotating shaft 59c ... Rising roller part 59d ... Downstream winding roller 59e ... Rising part 59f ... Drive roller 59g ... Tension adjustment means 59h ... Tension adjustment rollers 59j and 59k ... Drawing rollers 59n ... Belt raising roller 59p Outside roller 59q Variable speed V pulley 59r Synchronous setting pulley 59s V belt 6 Bag bottom forming device 60A Feeding device 601 Feed plate 610 Folding device 611 Braided blade 612: upper rotating shaft 613: receiving roller 614: lower rotating shaft 615 , 616 ... Pinch roller 620 ... Bottom folding crease device 621A, 621B ... Creased blade 622 ... Upper rotation shaft 623 ... Receiving roller 624 ... Lower rotation shaft 625 ... Recess 630 ... Bottom opening device 631 ... Upper rotation shaft 632 ... Rotating arc Plate 633 ... Pressing plate 634 ... Opening portion 635 ... Suction pad 636 ... Lower rotating shaft 637 ... Opening / closing claw 640 ... Bottom folding drum 640A ... Rotating shaft 640B ... Divided drum 641 ... Capturing claw 641a ... Tip 642 ... Fixing claw (front clamping) Claw) 642A: movable claw (front clamping claw) 643: open / close claw 644: rear holding claw 644A: mounting bracket 644B: movable shaft 644C: push-up lever 644D: cam contact portion 644E: cam contact portion 644F: spring 644G ... Second left and right cams 644H ... second up and down cams 645 ... rear raising pawls 645A ... mounting brackets Ket 645B ... Movable shaft 645C ... Depressing lever 645D ... Cam contact part 645E ... Cam contact part 645F ... Spring 645G ... First left and right cam 645H ... First up and down cam 646 ... Suction port 647 ... Support bracket 647a ... Concave portion 650 Flap prayer device 651 Guide plate 651a Flat plate portion 651b Inclined portion 652 Linear member 652a Contact portion 652b Upright portion 635 Mounting bar 654 Mounting arm 655 Mounting position setting means 655A Mounting Position setting surface 655B ... Mounting moving part 655C ... Fixing part 655D ... Support part 656 ... Rotating shaft 657 ... Open position setting means 657A ... Setting surface 657B ... Setting hole 657C ... Engaging member 657D ... Handle 657E ... Connection member 657F ... Biasing Member 658: urging member 659: press roller 660: gluing device 661 ... Tank 662 ... Gluing roller 662a ... Groove 663 opening 664 ... Relay roller 665 ... Gluing pad 666 ... Pad setting sheet 666A ... Square 666a, 666b ... Mounting hole 667,668 ... Mounting part 667a ... Biasing member 667b ... Mounting pin 669 air cylinder 670 flap rising device 671 pushing blade 672 rotating shaft 672A drive gear 680 bag bottom folding device 681 sprocket 681A rotating shaft 682 chain 683 bottom bent bar 684 bottom folded plate 684a ... Support part 685 ... Synchronization adjusting means 685A, 685B ... Elliptical gear 686 ... Planetary gear part 686A ... Sun gear 686B ... Planetary gear 686C ... Planetary gear case 686D ... Internal gear 686E ... Drive gear 686F ... Worm wheel 686G ... Worm gear A 687: Position adjusting portion 687A: Slot 687B: Support rod 687C: Position adjusting screw 687D: Worm wheel 687E: Worm gear 687F: Connection rod 687G: Fixing means 690: Rotating transport drum 691: Guide roller 692, 693: Endless Belt 694 ... Midway bag discharging means 694A ... Movable roller 694B ... Discharge plate 694C ... Driving means 694D ... Shaft 694E ... Movable arm 7 ... Counting device 71 ... Drum 72 ... Press roller 73 ... Product stand

Claims (14)

[Claims] 1. A paper bag for a paper bag is folded in two and bonded together, and both sides thereof are folded inward to form a paper cylinder having an M-shaped folded portion. The bottom folding line and the bottom folding line of the folding flap are formed in parallel on the front and back of the paper cylinder, and the front folding flap is turned upside down from the bottom folding line, and the front folding flap and the back folding flap. In a square-bottom bag making machine in which each of the front and back folding flaps are raised from the bottom folding line so as to overlap each other to be folded inward to form a square bottom portion of the paper bag, the square bottom serving as the bottom of the paper bag A bag bottom forming device that forms a portion has a catching claw that catches the back side folding flap of the paper cylinder, and a bottom folding drum that rotates and transports the paper cylinder by rotation, and a vicinity of an outer periphery of the bottom folding drum. Bottom opening device arranged to open the bag bottom of the paper cylinder Flaps which are disposed close to the outer periphery of the bottom folding drum, and which fold the front side folding flaps upside down from the bottom folding line to unfold the front and back folding flaps in a plane along the bottom folding drum. Equipment and
A post-raising claw that raises the folded front side folding flap from behind and below the bottom folding line, a back holding claw that presses the front side of the bottom folding line of the front folding flap from above when the front side folding flap rises, A bag making machine comprising: a gluing device for gluing front and back folding flaps; a flap rising device for raising the back folding flaps; and a bag bottom folding device for attaching each folding flap. 2. The bag making machine according to claim 1, wherein the rear holding claw and the rear raising claw are arranged in a pair on the left and right sides in the width direction of the bottom folding drum. 3. The front raising flap according to claim 1, wherein, when the front side flap is raised, the rear raising claw is located above the front surface paper of the paper cylinder spread on the outer periphery of the bottom folding drum and below the front side folding flap. Or the bag making machine according to 2. 4. The bag making machine according to claim 1, wherein the rear holding claw and the rear raising claw move in the axial direction of the bottom folding drum in accordance with the rotation of the bottom folding drum. 5. A post-raising pawl is integrated with a movable shaft, the movable shaft contacts the first left and right cam and moves in the axial direction, and a push-down lever disposed on the movable shaft is a first lever. The bag making machine according to any one of claims 1 to 4, wherein when the movable shaft rotates in contact with the upper and lower cams, the rear raising pawl can be moved on the outer periphery of the bottom folding drum. . 6. A rear holding claw is integrated with a movable shaft, the movable shaft contacts the second left and right cams and moves in the axial direction, and a push-up lever provided on the movable shaft has a second lever. The bag making machine according to any one of claims 1 to 5, wherein the rear holding claw is movable on the outer periphery of the bottom folding drum by rotating the movable shaft in contact with the upper and lower cams. . 7. The product according to claim 1, further comprising a press roller for pressing a paper cylinder having both folded flaps opened by a bottom opening device against an outer periphery of the bottom folding drum. Bag machine. 8. The first up / down and left / right cams are formed in such a shape that the back-raising pawl presses the surface paper of the paper cylinder when the bottom opening device opens the bag bottom of the paper cylinder. 8. The bag making machine according to any one of items 1 to 7. 9. The bag making machine according to claim 1, wherein the second up-down and left-right cams have a shape in which a back pressing claw presses a paper cylinder pressed by a press roller. . 10. The flap raising device includes a pushing blade for raising the bottom fold line portion of the front folding flap between the pawl and the back presser pawl when the front flap is raised. The bag making machine according to any one of claims 1 to 9, characterized in that: 11. A paper bag for a paper bag is folded in two and stuck together, and both sides are folded inward to form a paper cylinder having an M-shaped folded portion. The bottom folding line and the bottom folding line of the folding flap are formed in parallel on the front and back of the paper cylinder, and the front folding flap is turned upside down from the bottom folding line, and the front folding flap and the back folding flap. In a bag making method in which each of the front and back folding flaps are folded inward from the bottom folding line so as to form a square bottom paper bag, the bottom of the paper tube bag is opened, and the folded front side folding flap is folded into the bottom. While raising the front folding flap from the rear and below, the front folding flap is pressed down from above and the front side of the bottom folding line of the front folding flap is pressed down from above by the back pressing claw to thereby raise the front folding flap. A bag making method characterized by folding inward from a bottom folding line. 12. The bag-making method according to claim 11, wherein the back pressing claw and the rear raising claw press or stand up the paper cylinder and the front folding flap from both sides in the width direction. 13. The bag making method according to claim 11, wherein the rear pressing claw presses the front side flap of the paper cylinder from above after being pressed by the press roller. 14. The back-raising claw presses the front surface paper of the paper cylinder from above when opening the bag bottom.
14. The bag making method according to any one of 1 to 13.