JP4562073B2 - Bag making machine - Google Patents

Description

  The present invention relates to a bag making machine that manufactures a bag with a flap having a closing flap extending longer than an opening edge of a front plate at an opening end portion of a rear plate.

Conventionally, a bag making machine that automatically manufactures a bag with a closing flap is known.
For example, the both side edges of the paper bag are cut off from the opening edge by a distance corresponding to the size of the closing flap, and only the front wall or the back wall of the bag separated by the cutting is bent outward to separate from the other layers, and the rest Is cut off with a rotating knife parallel to the opening edge at a distance corresponding to the size of the closing flap from the opening edge, and the separated bag front wall or bag rear wall is separated from the other wall. A bag making machine that protrudes to form a closing flap has been proposed (see Patent Document 1 and Patent Document 2).
However, the above conventional bag making machine has the disadvantage that the process is complicated and the apparatus becomes large because the bag wall on the flap forming side is bent outward and the bag wall on the other side is cut off and extended again.
Further, since the flap portion that is not cut off is bent or extended, the flap of the product is damaged and a defective product is likely to occur.

Japanese Patent No. 3071636 Japanese Patent No. 3130004

  The problem to be solved by the present invention is to provide a bag making machine that can automatically manufacture a bag with a flap, has fewer steps, requires a shorter apparatus, and is less likely to damage the flap.

The bag making machine of the present invention manufactures a bag with a flap in which the opening end of the rear plate extends longer than the opening edge of the front plate, and one end is opened and both side edges of the one end are cut off. A transport device that transports the bags one by one so that the axial direction intersects the transport direction, a separation blade, a separate guide installed in this order from the upstream side to the downstream side in the transport path of the transport device, And the separator blade , the tip of which is centered on the base so that the tip of the separate blade is inserted and removed between the front plate and the rear plate from one end of the bag with rotation. The separation guide is configured to rotate along a track passing between the rear plate and the front plate at one end of the bag to be conveyed, and the separate guide is formed of a flat plate parallel to the bag to be conveyed, The blade was inserted and separated The bag passes between the surface plate and the rear plate through one side edge, and passes the bag to the cutter unit in a state where the front plate and one end of the rear plate are separated from each other. The cutter unit is the separate guide. And a fixed blade that supports the back surface of the front plate, and is pressed against the surface of the front plate, and in cooperation with the fixed blade, the front plate is cut from the end of the bag by a flap length. And a slitter blade.
You may provide the suction cup which adsorb | sucks the one end side of the said front surface plate, and floats up from a rear surface plate in the upstream of the said separate blade | wing.

According to the invention according to claim 1, since it is possible to cut only the front plate without bending one end of the rear plate, the number of steps is reduced and the apparatus is short, and the flap portion of the rear plate is After being bent, there is no risk of being damaged by returning to the original position.
According to the invention of claim 2, since the front plate is slightly lifted from the rear plate, the bag conveyed to the position of the separate blade is surely inserted between the front plate and the rear plate. Can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the bag making machine of the present invention has a flap-attached bag in which a closing flap c extending longer than the opening edge of the front plate b is provided at the opening end of the rear plate a. As shown in FIG. 1, a square bottom bag A ′ having one end opened and a pleat portion d on both sides is conveyed one by one so that its axial direction intersects the conveying direction. In the middle of the conveyance path of the conveyance device 1 and the conveyance device 1, a creasing roll 2, a roll 3 with a suction cup, a separate blade 4, a separate guide 5, and a cutter unit 6 installed in this order from the upstream side to the downstream side Is provided.

In the previous step, both side edges of one end of the square-bottom bag A ′ are cut out slightly longer than the length of the flap c (see FIG. 7), and one end of the square-bottom bag A ′ is cut into the front plate b And the rear plate a are divided.
The transport device 1 is composed of a number of feed rolls 7 or feed belts that are fed across the square bottom bag A ′, and the square bottom bag A ′ is fed to the transport device 1 from the previous process one by one with the front plate b facing up. .

The scoring roll 2 is composed of a pair of upper and lower rolls 8, 8 'facing each other. The upper and lower rolls 8, 8 ′ rotate around an axis along the width direction of the transport device 1, and a creasing blade 9 is formed on the outer periphery of the upper roll 8 along the circumferential direction.
And when square bottom bag A 'conveyed by the conveying apparatus 1 passes between the upper roll 8 and lower roll 8', as shown in FIG. 3, it corresponds to the flap c base part of the rear surface plate a and the front surface plate b. A fold line f that protrudes downward (on the surface side of the rear plate a) is formed along the width direction. This fold line f becomes a fold when folding the flap c to close the bag A with flap.

As shown in FIGS. 4 and 5, the roll 3 with the suction cup is installed near one end of the square bottom bag A ′ to be transported, and opposite the roll 3 with the suction cup, below the square bottom bag A ′, A receiving roll 10 is installed.
The receiving roll 10 is attached to a first rotating shaft 10a installed in the width direction of the transport device 1, and the sucker-equipped roll 3 is attached to a second rotating shaft 3a parallel to the first rotating shaft 10a. Further, the gear 10b fixed to the first rotating shaft 10a and the gear 3b fixed to the second rotating shaft 3a mesh with each other so that the sucker-equipped roll 3 and the receiving roll 10 rotate synchronously. (Fig. 4).
When the suction cup 11 for vacuum suction is provided on the outer periphery of the roll 3 with the suction cup and the square bottom bag A ′ passes between the roll 3 with the suction cup and the receiving roll 10, as shown in FIGS. 7 and 8, One end portion of the front plate b is attracted to the suction cup 11 and separated from the rear plate a, and one end portion of the fold portion d is also pulled by the front plate b and slightly floats.

As shown in FIG. 4 to FIG. 6, the upright rotating shaft 12 is erected slightly to the side of the square bottom bag A ′ to be conveyed, and the base of the separate blade 4 is fixed to the upper end of the upright rotating shaft 12. Is done.
The first bevel gear 20 is fixed to the outer periphery of the lower end portion of the upright rotating shaft 12, and the second bevel gear 21 that meshes with the first bevel gear 20 is a third parallel to the first rotating shaft 10 a. It is fixed to the rotating shaft 4a.
Further, the gear 4b fixed to the third rotating shaft 4a meshes with the gear 10b fixed to the first rotating shaft 10a, and when the receiving roll 10 and the suckered roll 3 rotate, the upright rotating shaft 12 is It rotates and the separate blade | wing 4 rotates.

As shown in FIGS. 9 and 10, the trajectory of the tip of the separate blade 4 passes between the rear plate a and the front plate b at one end of the square bottom bag A ′ conveyed by the conveying device 1. The tip of the separate blade 4 is inserted and removed between the front plate b and the fold portion d and the rear plate a from one end of the square bottom bag A ′ as it rotates.
Note that the trajectory of the tip of the separate blade 4 is slightly higher when it is away from one end of the square bottom bag A ′, and is inclined to be lower when it is inserted from one end of the square bottom bag A ′. This is because when the folding line f is attached to the square bottom bag A ′ by the creasing roll 2, one end portion of the square bottom bag A ′ is inclined so as to gradually increase from the folding line f toward the tip.
Further, the rotational speed of the separate blade 4 is set to be slightly higher than the conveying speed of the square bottom bag A ′, and the separate blade 4 comes out of the square bottom bag A ′ and is transferred to the next separate guide 5 at the same time. ing.

As shown in FIGS. 4 and 5, the separate guide 5 is composed of a flat plate parallel to the square bottom bag A ′ conveyed by the conveyance device 1, and its upstream end is the inner side (square bottom of the separate blade 4). It is installed so that the inner edge faces the outer side (one end side) of the folding line of the square bottom bag A ′ so as to be located on the other end side of the bag A ′.
The outer portion of the separate guide 5 is notched so as not to interfere with the orbit of the separate blade 4.
And when the separate blade | wing 4 is inserted between the one end part of the rear surface plate a, and the one end part of the front surface plate b, and when the square bottom bag A 'is conveyed in the separated state, it will be shown in FIGS. Thus, at the same time as the separating blade 4 comes out of the square bottom bag A ′, the separating guide 5 passes through the cut portion e on one side and separates one end of the rear plate a and one end of the front plate b and the fold portion d. Inserted between.

As shown in FIGS. 4, 5, 11, and 12, the cutter unit 6 is integrated with the separate guide 5 and pressed against the surface of the front plate b and the fixed blade 13 that supports the back surface of the front plate b. And a slitter blade 14.
The fixed blade 13 is formed in a flat plate shape continuous from the downstream end edge of the separate guide 5, and one end of the rear plate a, the front plate b, and one end of the fold portion d of the bag A delivered from the separate guide 5. It is inserted between the parts.
Further, when the fixed blade 13 is inserted between the rear surface plate a, the front surface plate b, and the fold portion d of the square bottom bag A ′, the cutting edge formed on the inner edge of the fixed blade 13 is folded on the front surface plate b. It contacts the back surface of the line f.

The slitter blade 14 is fixed to a shaft 15 extending in the width direction of the conveying device 1, and its tip is opposed to the cutting edge of the fixed blade 13 and is pressed against the surface of the front plate b.
The shaft 15 is connected to the output shaft 18 of the motor 17 via a belt 19 so that when the motor 17 is driven, the slitter blade 14 rotates.
When the square bottom bag A ′ is conveyed and the slitter blade 14 is rotated, the slitter blade 14 and the fixed blade 13 cooperate with each other so that the front plate b and the fold portion d have a length corresponding to the flap c from one end thereof. Cut in parallel with one end of the square-bottom bag A ′ at the deep position.
As a result, a closing flap c extending longer than the opening end of the front plate b is formed at one end of the rear plate a.

In addition, by cutting off both ends of one end of the square bottom bag A ′ longer than the length of the flap c, the opening end is closed with the flap c, and then the contents such as the granular material are put into the bag through the cut portion e. It becomes possible to supply to.
The portion cut off from the front plate a and the fold portion d by the cutter unit 6 is sucked into the duster 16 (FIG. 1) and discarded.
Further, on the downstream side of the cutter unit 6, release paper is stuck to the back surface of the flap c via an adhesive, and the bag A with flap is completed.

The flap-attached bag A may be a bag other than the creased square bottom bag. In this case, only one end of the front plate may be cut off. The material of the bag A with flap can be arbitrarily selected from single-layer paper, multilayer paper, synthetic resin-coated paper, and the like.
Furthermore, the drive mechanism of each member of the bag making machine is not limited to the above embodiment, but can be replaced with another mechanism having the same function.

The top view of the bag making machine which shows the Example of this invention. The side view of the bag making machine which shows the Example of this invention. The principal part perspective view of the bag making machine which shows the Example of this invention. Sectional drawing seen from the upper direction and downstream of the bag making machine principal part which concerns on the Example of this invention. Sectional drawing seen from the front of the bag making machine principal part which concerns on the Example of this invention. Sectional drawing which shows the rotational force transmission mechanism of a separate blade | wing and a receiving roll. The top view of the square bottom bag adsorbed | sucked with the suction cup. Sectional drawing of FIG. The top view of the square bottom bag in the delivery position from a separate blade | wing to a separate guide. Sectional drawing of FIG. The top view which shows the cutting process by a cutter part. Sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveying device 2 Scaffolding roll 3 Suction cup roll 3a 2nd rotating shaft 3b Gear 4 Separate blade 4a 3rd rotating shaft 4b Gear 5 Separate guide 6 Cutter part 7 Feeding roll 8 Upper roll 8 'Lower roll 9 Straightening blade 10 Receiving roll 10a First rotating shaft 10b Gear 11 Suction cup 12 Standing rotating shaft 13 Fixed blade 14 Slitter blade 15 Shaft 16 Duster 17 Motor 18 Output shaft 19 Belt 20 First bevel gear 21 Second bevel gear A Bag with flap A 'Square bottom bag a Rear plate b Front plate c Flap d Folded part e Cut part f Folding line

Claims (2)

A bag making machine for manufacturing a bag with a flap in which the opening end of the rear plate extends longer than the opening edge of the front plate, and the bag whose one end is open and both side edges are cut off is its axis. A conveying device that conveys the sheets one by one so that the direction intersects the conveying direction, and a separation blade, a separation guide, and a cutter unit that are installed in this order from the upstream side to the downstream side in the conveying path of the conveying device. And the separate blades of the bag, the tip of which is transported around the base so that the tip of the blade is inserted and removed from one end of the bag between the front plate and the rear plate with rotation. The separation guide is configured to rotate along a trajectory passing between the rear plate and the front plate at one end, and the separate guide is formed of a flat plate parallel to the bag to be conveyed, and separated blades are inserted and separated. The front and rear plates And passes through the side edge of the one end portion, and passes the bag to the cutter portion in a state where one end portion of the front plate and the rear plate is separated, the cutter portion being integrated with the separate guide, A fixed blade that supports the back surface of the front plate, and a slitter blade that is in pressure contact with the surface of the front plate and cuts the front plate at a position recessed from the end of the bag by a flap length in cooperation with the fixed blade. A bag making machine characterized by The bag making machine according to claim 1, wherein a suction cup is provided on the upstream side of the separate blade to adsorb one end of the front plate and lift it from the rear plate.

Images