JP2015157375A - bag bottom forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag bottom forming apparatus that enables a side claw position to be easily adjusted in a short period of time when a bag size is changed.SOLUTION: A bag bottom forming apparatus 13 includes cylinders (34 and 35) that are rotated in the state of supporting a flatly-folded paper cylinder T, and a bottom opening device that is arranged near a surface of the cylinder and that opens an end of the paper cylinder T. A pair of side claws 38 for pressing a side edge of the paper cylinder against a surface of the cylinder is provided near right and left ends of the cylinder. The cylinder is split into a center drum 34 and side drums 35 and 35 that are arranged on the right and left sides of the center drum. The side drum 35 comprising the side claw 38 is axially enlarged or narrowed in synchronization with the center drum 34.

Description

  The present invention relates to a bag bottom forming apparatus, and more particularly to a bag bottom forming apparatus in a line for continuously producing kraft paper packaging bags.

  Patent Document 1 discloses a bag making machine that manufactures a paper bag such as a shopping bag, which includes a paper feeding device, a paper tube forming device, a bag bottom forming device, and a press device. The bag bottom forming device attaches a paper tube that is folded flat and cut to a predetermined size to the surface of a bottom folding drum (cylinder or large cylinder), and then folds one end of the paper tube into a hexagonal shape, thereby Glue is applied to the periphery of the square opening to be formed, and a trapezoidal front flap and a rear flap are folded and pasted in order to form a square bottom. When opening the paper tube, the center of the lower paper is pressed against the surface of the bottom folding drum by the catching claw on the front side in the traveling direction, and the left and right edges on the front side are held by the clamping claw when folding the flap, The left and right side edges of the back are raised and held by the nail and the back presser claw.

  Patent Document 2 discloses a toilet paper roll packaging paper bag that is considerably larger than a paper bag such as a shopping bag. Such a wrapping paper bag is basically manufactured from kraft paper, and in particular, is manufactured as a heavy bag from a double sheet in which two kraft papers are stacked. And it is used as an integrated manufacturing line in combination with a bag making machine similar to Patent Document 1, a printing line provided in the preceding process, and an aligning / conveying device and a palletizing robot provided in the following process.

JP 2000-25130 A JP 2003-182767 A

  On the left and right side edges of the bottom folding drum shown in Patent Document 1, a pair of claws are attached to the left and right, such as a front clamping claw that clamps the left and right edges of the paper tube, a rear raising claw, and a rear pressing claw. . When manufacturing different types of paper bags, the distance between the left and right nails is adjusted according to the width of the paper bag and other conditions. In this adjustment operation, it is necessary to match the position of each nail and the arrangement balance between the front and rear nails according to the thickness of the bag, the strength of the paper, the accuracy of the crease line to be inserted before folding. Moreover, it is necessary to arrange the left and right claws symmetrically. Since fine adjustment and trial folding are repeatedly determined, considerable skill is required.

  Patent Document 2 describes a method for manufacturing a large paper bag for storing toilet paper. In particular, FIG. 3 of Patent Document 2 describes the bag bottom forming step in the order of steps (see FIG. 7). In the case of the large paper bag of Patent Document 2, since the bottom folding drum is large and the gap between the claws is wide, the position adjustment of the claws is more complicated and takes time.

  The present invention provides a bag bottom forming device capable of easily adjusting the position of a claw or the like for holding a side edge of a paper bag in a short time when changing the size of a paper bag in a bag bottom forming device of a bag making machine. This is a technical issue.

A bag bottom forming device according to the present invention (Claim 1) includes a cylinder that supports and rotates a flatly folded paper tube, and a bottom opening device that is disposed near the surface of the cylinder and opens an end of the paper tube. A bag bottom forming device for attaching an inner patch to an opening of the opened paper tube, wherein a pair of side claws for pressing the side edges of the paper tube against the surface of the cylinder are provided near the left and right ends of the cylinder. The cylinder is divided into a center drum and side drums disposed on the left and right sides of the center drum. It is characterized by its adjustable position.

  In such a bag bottom forming apparatus, it is preferable that the bag bottom forming apparatus includes an interval adjusting mechanism that synchronizes the left and right side drums to widen or narrow the interval in the axial direction. Further, the spacing adjusting mechanism includes a right screw and a left screw male screw member provided on a support member that supports each side drum, and a female screw member that is provided on the left and right side drums and is screwed with the male screw member. Preferably, the left and right male screw members are composed of rotating means for rotating in synchronization.

  Further, a pair of left and right male screw members are rotatably mounted on the support shaft so as not to move in the axial direction, and are screwed into the male screw members so as to be movable in the axial direction with respect to the support shaft. And the left and right side drums are rotatable around the female screw member and moved in the axial direction relative to the female screw member. What is supported so that it does not occur is preferable (Claim 4). Further, a first quay that raises the front end side flap near the center drum near the front end of the paper tube, and a second raise that raises the rear end side flap near the rear end of the paper bottom. And an angle adjusting mechanism for adjusting the angles of the first and second side claws and the angles of the first and second squeezes, and the support shaft is hollowed, More preferably, the drive shaft of the angle adjusting mechanism is passed through the cavity (Claim 5).

  In the bag bottom forming apparatus of the present invention (Claim 1), the cylinder is divided into a center drum and side drums having side claws arranged on the left and right sides of the center drum, and the side drums are positioned in the axial direction. Because it is adjustable, when changing the size (width) of the paper bag, adjust the position of the side nail just by adjusting the left and right width of the side drum while leaving the position of the side nail on the side drum unchanged be able to. Therefore, it is not necessary to adjust the position of each side claw, and the position of the side claw can be easily adjusted in a short time.

  In such a bag bottom forming apparatus, when the left and right side drums are synchronized with an interval adjusting mechanism that increases or decreases the axial interval (Claim 2), the center position of the left and right side drums The position of the side nail can be adjusted without changing the position. Therefore, it is easier to adjust the position of the side claw.

  The spacing adjusting mechanism includes a right screw and a left screw male screw member provided on a support member that supports the respective side drums, and a female screw member that is provided on left and right side drums and that is screwed with the male screw member. In the case where the left and right male screw members are rotated in a synchronized manner (Claim 3), the left and right side drums are actuated by screws when the rotating means is rotated in one direction or the other direction. Can be easily approached or separated.

In this case, a pair of left and right male screw members are mounted on the support shaft so as to be rotatable and do not move in the axial direction, and are screwed with the male screw members and moved in the axial direction with respect to the support shaft. A female screw member that is held freely so as not to rotate, and the left and right side drums are rotatable around the female screw member and axially relative to the female screw member. (Claim 4), the relative angle (phase) around the central axis between the left and right female screw members does not change. Therefore, the position adjustment is easier.

  Also, a first quay that raises the front end side flap near the front end of the paper cylinder by the center drum, and a second rear end side flap that rises up near the rear end of the bottom part. And an angle adjusting mechanism that adjusts the angle of the first and second side claws and the angle of the first and second wings, and the support shaft is hollowed out. When the drive shaft of the angle adjusting mechanism is passed through the cavity (Claim 5), the circumferential interval between the first and second claws and the circumferential interval between the first and second flares are easy. Can be adjusted to.

It is a principal part side view which shows one Embodiment of the bag making machine provided with the bag bottom formation apparatus of this invention. It is a side view which shows one Embodiment of the bag bottom forming apparatus of this invention. It is a schematic perspective view which shows one Embodiment of the bag bottom forming apparatus of this invention. It is explanatory drawing which shows the effect | action of the angle adjustment mechanism in the bag bottom forming apparatus of this invention. It is sectional drawing which shows one Embodiment of the space | interval adjustment mechanism which adjusts the space | interval of a side drum. It is a principal part expanded sectional view of the space | interval adjustment mechanism of FIG. It is sectional drawing which shows one Embodiment of the angle adjustment mechanism in the bag bottom forming apparatus of this invention. It is process drawing which shows the manufacturing process of the conventional paper bag.

  A bag making machine 10 shown in FIG. 1 is a production line for manufacturing a large paper bag as in Patent Document 2, and includes an upstream printing machine (on the right side of FIG. 1, not shown), and a printer from the printing machine. A tube 11 that forms the belt-shaped paper that is formed into a flat paper tube T, a cutting device 12 that cuts the formed paper tube T to a predetermined length, and a front end of the paper tube T is folded into a substantially hexagonal shape. A bag bottom forming device 13 for attaching an inner patch to the opening, an inner patch supply device 14, an outer patch attaching device 15 for attaching an outer patch on the bag bottom closed by the inner patch, and an outer patch supply device 16 And an aligning and conveying device 17 for stacking and feeding the manufactured paper bags.

  In the bag making machine 10 of FIG. 1, strip-shaped paper is supplied to the printing machine, subjected to predetermined printing, and sent to the tuba 11 to be formed into a flat cylindrical shape. The paper may be doubled to increase strength. In the tuba 11, glue is applied to the side edges of the belt-shaped paper, both sides are folded toward the center, and both side edges are overlapped and bonded. As a result, a continuous flat paper tube T is formed.

  Subsequently, the continuous strip-shaped paper tube T is cut into a predetermined length by the cutting device 12. After cutting, the speed increases somewhat, the cut paper tube T is separated from the subsequent continuous tube, sent to the bag bottom forming device 13, and opened so that the front end side has a substantially hexagonal outline (imagination in FIG. 3). Line and bottom opening process in FIG. 8). Further, the opening 22 of the bag is closed by the inner patch 21 supplied from the inner patch supply device 14, and the outer patch (reference numeral 23 in FIG. 7) is attached by the outer patch attaching machine 15. In the outer patch applicator 15, the front ends of the opened portions are bent, the front ends are overlapped and pasted, and the outer patch is pasted thereon. The obtained paper bags are sent out after being stacked in a predetermined number by the aligning and conveying device 17.

As shown in FIG. 2, the cutting device 12 on the upstream side of the bag bottom forming device 13 draws out a flat paper tube T flowing from the tuba 11 in order from the upstream side (right side in FIG. 2).
, A cutter 12b for cutting the paper tube T to a predetermined length, a bag feeding roll 12c for feeding the cut paper tube T toward the downstream, a horizontal stripe roll 12d for folding the paper tube T in a lateral direction, and an oblique for folding an oblique crease A muscle roll 12e and an opening cylinder 32a are provided. The lower vertical knife roll 12f facing the oblique muscle roll is provided with a cutter (vertical knife) for making a vertical cut at the tip of the paper tube T before opening. A pinch roll 12g is provided between the cutter 12b and the bag feeding roll 12c. These roll groups are driven by a motor M.

  The inner patch supply device 14 includes a holding device 27 that holds a kraft paper raw material roll 26 in a rotatable and replaceable manner, a belt-like paper speed drawn from the holding device, a rotation speed of a large cylinder, A control device 28 that performs various settings such as adjustment with processes and performs automatic control is provided.

  At a substantially central position in the front-rear direction of the bag bottom forming device 13, a large cylinder 30 that supports the paper tube T, expands the end thereof, and serves as a base for attaching the inner patch is rotatably supported. A vacuum cylinder 31 that adsorbs and expands the upper surface side of the end portion of the paper bag is provided on the upper portion of the large cylinder 30 so as to be in contact with the large cylinder 30 and to be rotatable. On the upstream side of the vacuum cylinder 31, a bottom opening device 32 and an opening cylinder 32a that open the leading end side of the paper tube T sent from the roller group 25 into a substantially hexagonal shape are provided. The operation timing of the vacuum cylinder 31 is adjusted by the adjusting shaft 64 shown in FIG. On the downstream side of the vacuum cylinder 31, there are provided a gripping cylinder 33 for gripping the vicinity of the leading end of the paper tube by a first squeeze (see reference numeral 36 in FIG. 3) and a rotary closing spring 33a for releasing the gripping. . The timing for raising and releasing can be determined by a cam or the like. Further, a feed cylinder 33b for feeding the paper tube T to the outer patch applicator is provided below the large cylinder 30.

  As shown in FIG. 3, the large cylinder 30 is divided into a central center drum 34 and a pair of side drums 35, 35 arranged on the left and right sides thereof, and these are provided rotatably around a rotation center C. ing. Further, the large cylinder 30 is provided with an interval adjusting mechanism (see reference symbol A in FIG. 5) that moves the left and right side drums 35 and 35 in the axial direction in synchronization with each other to increase or decrease the interval therebetween. Further, the center drum 34 is gripped so as to fold the lower surface near the front end and the rear end near the bottom of the paper bag T, and the first squeeze 36 and the second squeeze 36 raise the front end side flap Ff and the rear end flap Fr, respectively. A quaie 37 is provided. The side drums 35, 35 are provided with side claws 38 that hold down the left and right ends of the paper tube T in order to expand the bag bottom into a hexagon.

  When the large cylinder 30 supports the paper tube T and opens the tip to attach the inner patch, the three drums 34, 35, and 35 rotate together. That is, neither the relative position in the axial direction nor the relative angle (phase) around the axis changes. When the width b1 is changed by changing the type of paper bag to be manufactured, the distance between the left and right side drums 35, 35 is adjusted according to the width b1 (see FIG. 4) of the paper bag (arrow B). Thereby, the distance between the left and right side claws 38 is also adjusted. Further, when the bottom width b of the paper bag corresponding to the circumferential direction of the drum is changed, the relative angle (phase) around the axis of the center drum 34 and the side drum 35 is adjusted, and the first quat 36 and the side claw 38 are adjusted. 38 (adjusted in the circumferential direction). At the same time, the angular position of the second hoe fly 37 is adjusted, and the relative angle between the first hoe fly 36 and the second hoe fly 37 is also adjusted. It is preferable that the adjustment of the gap between the side claws and the angle of the squeeze can be automatically changed to a preset value usually by motor driving.

Next, an interval adjusting mechanism for adjusting the interval between the left and right side drums 35 will be described with reference to FIGS. As shown in FIGS. 5 and 7, the center drum 34 is fixed to pipe-like left and right drive shafts 40 (see FIG. 4) and 41 (see FIG. 6). A ball bearing is supported on the inner periphery of the pipes 42 and 43 so as to be rotatable and not to move in the axial direction. FIG. 6 shows the vicinity of the left drive shaft 40 in an enlarged manner, but the right drive shaft 41 is substantially the same. The pipes 42 and 43 are fixed to the frame 44 by flanges 42a and 43a at the end portions. As shown in FIG. 7, a boss portion 45 a of the drive gear 45 is fixed to the outer periphery of the right drive shaft 41. The teeth 45b around the drive gear 45 mesh with the small-diameter drive gear 46, and are driven to rotate by the rotation drive motor M via the bevel gear unit G1 and a universal joint (not shown).

  On the other hand, as shown in FIG. 6, a cylindrical sleeve 47 is mounted on the outer periphery of the left pipe 42 so as to be rotatable and not move in the axial direction. Around the right pipe 43 shown in FIG. 7, a right sleeve 48 shown in FIG. 5 is mounted so as to be rotatable and not to move in the axial direction. As shown in FIG. 6, for example, a right-hand male screw 49 is formed on the outer periphery of the left sleeve 47. The right sleeve 48 is formed with a male screw composed of a screw (in this case, a left screw) in the opposite direction. It should be noted that the male screws may be opposite to each other, the left sleeve 47 may be provided with a left screw, and the right sleeve 48 may be provided with a right screw. Gears (see reference numeral 47a in FIG. 6) are formed in the vicinity of the outer ends of the left and right sleeves 47 and 48, and the driving force from the tuning shaft (see reference numeral 51 in FIG. 5) via the idle gear train 50. To be received. As shown in FIG. 5, the tuning shaft 51 is rotatably supported by the left and right frames 43, and is connected to a motor M1 for adjusting the distance.

  Around each sleeve 47, 48, a support boss 52 is mounted so as to be movable in the axial direction and not to rotate. In the case of FIG. 5, an arm 53 integral with the support boss 52 extends radially outward from the support boss 52, a pin hole 54 is formed in the arm 53, and the arm 53 is connected to the arm 53 by a pin 55 fixed to the frame 43. The support boss 52 is restricted so as not to rotate. However, the pin 55 and the pin hole 54 are slidably fitted, and the movement of the support boss 52 and the arm 53 in the axial direction is not restricted. As shown in FIG. 6, a female screw 56 that is screwed with a male screw of the sleeve 47 is formed on the inner periphery of the boss 52 a of the support member. The side drum 35 is provided on the outer periphery of the support boss 52 so as to be rotatable and not to move in the axial direction. The same applies to the right support boss 52 and the arm.

  Further, as shown in FIG. 5, the side drum 35 is provided with a guide pin 57 for synchronous rotation that transmits the rotational driving force from the center drum 34 while allowing movement in the axial direction. For example, two guide pins 57 are provided on one side. The center drum 34 is formed with holes 58 that are slidably fitted to the guide pins 57 in the axial direction. Accordingly, the side drum 35 is movable in the axial direction with respect to the center drum 34 and rotates in synchronization with the center drum 34.

Next, the operation of the bag bottom forming device 13 configured as described above will be described. At this time, the interval adjusting mechanism A is stopped.
[Normal rotation]
In the bag bottom forming apparatus 13 configured as described above, when the rotation drive motor rotates, the drive gear 45 rotates and the center drum 34 rotates through the right drive shaft 41. The position of the center drum 34 in the axial direction (the position in the left-right direction in FIG. 4) is regulated by the left and right support members 42 and 43 and does not move in the axial direction. When the center drum 34 is rotated, the left and right side drums 35 and 35 are rotated together through the guide pins 57. In this case as well, the left and right side drums 35 are not moved in the axial direction because the positions in the axial direction are restricted by the support members 42 and 43 and the support boss 52. Then, the rotation of the center drum 34 and the side drum 35 opens the leading end of the paper tube T supplied to the large cylinder 30 as indicated by the imaginary line in FIG. 3, and the inner patch (reference numeral 21 in FIG. 8) is attached.

[Interval adjustment]
Next, when the interval adjusting motor M1 shown in FIG. 5 is rotated while the rotation of the entire cylinder is stopped, the left sleeve 47 rotates via the idle gear train 50, and further via the tuning shaft 51. The right idle gear train 50 and the right sleeve 48 also rotate. However, the support boss 52 provided with the female screw that is screwed with the male screw of the sleeves 47 and 48 does not rotate due to the restriction of the arm 53 and the pin 55. Thereby, the female screw rotates relative to the male screw and advances in the axial direction, so that the interval between the left and right sleeves 47 and 48 is increased or decreased. Accordingly, the left and right side drums 35 and 35 are separated from or approach each other symmetrically with respect to the center line. Thereby, the interval between the left and right side claws 38 is adjusted.

[Angle adjustment mechanism]
The bag bottom forming device 13 shown in FIGS. 5 to 7 has shafts between the center drum 34 and the first quay support drum 62 in accordance with the bottom width of the paper bag corresponding to the circumferential direction (see symbol b2 in FIGS. 3 and 4). An angle adjustment mechanism B that adjusts the relative angle (phase) of the surroundings and adjusts the distance between the first hoe 36 and the second hoe 37 is provided. In this embodiment, the angle adjusting mechanism B has a function of simultaneously adjusting the angle position of the side claw support drum 63 with respect to the center drum 34 and adjusting the angle of the first squeeze 36 and the side claw 38.

  As shown in FIG. 6, the angle adjustment mechanism B includes an angle adjustment shaft 60 that passes through the right pipe-shaped drive shaft 41, a servo motor Ms that rotationally drives one end of the angle adjustment shaft, and an angle adjustment shaft 60. Of the differential gear (differential gear mechanism) 61 provided at the other end of the motor, a second quay support drum 62 that rotates by receiving torque from the differential gear 61, and a second quay support drum 62 that receives torque from the differential gear 61. It consists of a side claw support drum 63 that rotates about ½ times. Each of the support drums 62 and 63 is rotated by a predetermined rotation angle applied by a servo motor Ms with respect to a side drum body provided with a guide pin 37 connected to the center drum 34. The second quay support drum 62 and the side claw support drum 63 of the left side drum 35 are driven via a differential gear 61.

  In the angle adjusting mechanism B configured as described above, when the servo motor Ms rotates, the second quay support drum 62 rotates in accordance with the rotation angle, and the phase with respect to the first quaver 36 advances or retracts. These adjustments are also automatically performed so as to match the set values with a servo motor or the like. Manual operation may also be used.

DESCRIPTION OF SYMBOLS 10 Bag making machine 11 Tuba T Paper tube 12 Cutting device 12a Drawer roll 12b Cutter 12c Bag feeding roll 12d Horizontal muscle roll 12e Oblique muscle roll 12f Vertical female roll 12g Pinch roll 13 Bag bottom forming device 14 Inner patch supply device 15 Outer patch pasting machine 16 Outer Patch Supply Device 17 Alignment Transport Device 21 Inner Patch 22 Bag Opening 23 Outer Patch 25 Roller Group 26 Raw Material Roll 27 Holding Device 28 Control Device 30 Large Cylinder 31 Vacuum Cylinder 32 Bottom Opening Device 32a Opening Cylinder 33 Cylinder 33a Rotating closing spring 33b Feed cylinder A Interval adjusting mechanism 34 Center drum 35 Side drum Ff Front end flap Fr Rear end flap 36 First squeeze 37 Second squeeze C Rotating shaft b1 Horizontal width b2 Bottom width 38 Side claw b1 Paper cylinder Width b2 of paper tube bottom width 40, 41 Drive shaft 42, 43 Pipe 42a, 43a Flange 44 Frame 45 Drive gear 45a Boss portion 45b Teeth 46 Drive gear G1 Bevel gear unit M Rotation drive motor 47, 48 Sleeve 47a Gear 49 Male screw 50 Idle gear train 51 Tuning axis G2 Gear unit M1 Distance adjustment motor 52 Support boss 53 (integrated with support member) arm 54 Pin hole 55 Pin 56 Female screw 57 Guide pin 58 Hole 60 Angle adjustment axis Ms Servo motor 61 Differential Gear (differential gear mechanism; differential)
62 Second Kuwae Support Drum 63 Side Claw Support Drum 64 Vacuum Cylinder Timing Adjustment Axis

Claims (5)

  A cylinder that supports and rotates a flatly folded paper cylinder, and a bottom opening device that is disposed near the surface of the cylinder and opens an end of the paper cylinder. An inner patch is provided at the opening of the opened paper cylinder. A pair of side claws that press the side edges of the paper tube against the surface of the cylinder near the left and right ends of the cylinder, the cylinder comprising a center drum and its center A bag bottom forming apparatus that is divided into side drums arranged on the left and right sides of the drum, the side drums having the side claws, and the center drum can be adjusted in position in the axial direction.   The bag bottom forming apparatus according to claim 1, further comprising an interval adjustment mechanism that synchronizes the left and right side drums to increase or decrease an axial interval.   The spacing adjusting mechanism includes a right screw and a left screw male screw member provided on a support member that supports the respective side drums, and a female screw member that is provided on left and right side drums and that is screwed with the male screw member. The bag bottom forming device according to claim 2, further comprising a rotating means for rotating the left and right male screw members synchronously.   A pair of left and right male screw members are mounted on the support shaft so as to be rotatable and do not move in the axial direction, and are screwed with the male screw members so as to be movable in the axial direction with respect to the support shaft. And the left and right side drums are rotatable around the female screw member and do not move in the axial direction relative to the female screw member. The bag bottom forming apparatus according to claim 3, wherein the bag bottom forming apparatus is supported as described above.   A first quay that raises the front end side flap by holding the center drum near the tip of the bottom of the paper tube, and a second quay that raises the vicinity of the rear end of the bottom and raising the rear end side flap of the bottom. And an angle adjusting mechanism for adjusting the angles of the first and second side claws and the angles of the first and the second claws, and the support shaft is hollowed, and the hollow The bag bottom forming apparatus according to claim 4, wherein a drive shaft of the angle adjusting mechanism is passed through the bag bottom forming apparatus.

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