JP3005641U - Bottom folding device for rotary bag making machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bottom folding device for a bottom sticking piece having a simple structure in which the bottom of the finished envelope does not have a peculiar bending tendency, and eliminates printing problems. [Structure] The outer periphery of the roll is tangentially cut to a desired width to form a flat portion 7, and a step portion 8 is provided at the front end portion in the rotation direction thereof, and a portion of the flat portion 7 near the step portion 8 is provided at a predetermined timing. An air drum 6 for bottom folding provided with a suction port 9 for sucking, and a pressing member 13 for folding the bottom sticking piece 4 with a clearance through which the envelope body 3 can pass, above the drum substantially on the center line of the drum. Is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a bottom folding device of a rotary bag making machine for manufacturing envelopes and document bags.

[0002]

[Prior art]

 Conventionally, in the manufacture of envelopes using a rotary bag-making machine, both sides of continuous paper are cut into a bag shape, the glued sides are folded and stuck together, and cut between the bottom sticking piece and the bag mouth piece. It was transferred as a single-sized envelope to the bottom folding device, and the bottom line was bent by the device, so that it was performed as shown in FIG. In the figure, 31 is a folding blade, 32 is a glue blade, 33 is a bottom folding drum, 34 is a body portion of the bottom folding drum, 35 is a slit formed in the body portion 34, and 36 is arranged in the slit. It is a sandwiching plate, and the rotating folding blade 1 enters the slit 35 to push the base of the bottom sticking piece A of the envelope (the boundary with the body A ') into the slit 35 and bend it. The fold line B was formed by swinging the inside of the slit 35 in the rotation direction of the bottom folding drum 33 and sandwiching the pushed and bent portion.

When the holding plate 36 strongly holds the portion of the envelope that is in the slit 35, the base of the bottom sticking piece A of the envelope is bent at a substantially right angle from the state shown in FIG. 7 by the holding plate 36. Therefore, this remains as a habit, and even when it is finished as a product, as shown in FIG. 8, there is a crease C in which the bottom part is still bent in a dogleg shape on one side.

As described above, an envelope whose part of the bottom is bent is difficult to set in the printing machine when a printing company prints, and troubles are likely to occur in feeding the sheets one by one accurately. However, printers have requested improvement in this respect.

[0005]

[Problems to be Solved by the Invention] For this reason, when the envelope is completed as in the conventional case, a part of the bottom part is prevented from being bent to one side, and the actual opening flat 2- There is a device for a bottom folding drum described in Japanese Patent No. 65540.

However, in this invention, the outer periphery of the body is tangentially cut to a required width to form a flat portion, and a V-shaped groove is provided at the tip of the flat portion in the body rotation direction. Further, a bottom folding drum main body provided with a suction port for suctioning at a predetermined timing in a portion near the V-shaped groove of the flat portion, and a base portion is fixed to a rotary shaft installed in the drum main body, A pawl member having a tip portion curved toward the flat portion side of the body portion, which vertically rotates in a notch provided in a front portion in the rotation direction of the flat portion of the body portion through rotation of the rotating shaft; However, it also requires a folding blade to be pushed into the V groove, and the claw member must be projected and retracted during rotation. Therefore, the number of parts such as cams, arms, and other parts must be increased. The envelope structure is very complicated and the movement mechanism is complicated. There is a problem that it is difficult to adjust the timing, adjust the timing of raising and lowering the claw member with the cam, and set it, require a considerable amount of skill and experience, and require a specialized engineer.

The present invention has solved such problems and has a simple structure, in which a part of the bottom sticking portion of the finished envelope does not have a dogleg-shaped crease on one side at all, and automatically. It is an object of the present invention to provide a bottom folding device capable of accurately sticking the bottom of an envelope.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the bottom folding apparatus of the present invention has a flat portion by notching the outer circumference of a roll to a desired width in a tangential direction and a step portion at the front end of the flat portion in the rotation direction. Depending on the rotational position, the bottom folding air drum is equipped with an appropriate number of air inlets to suck the portion immediately after the folding line given in advance on the bottom strip of the envelope body, and the envelope above the drum almost on the center line of the envelope. There is an appropriate gap through which the main body can pass, and a pressing member for folding down the bottom sticking piece is arranged on the envelope main body glued along the fold line. The pressing member may be an L-shaped pressing plate or roll, or a bar.

In the bottom folding air drum, the intake port is connected to an intake hole penetrating in parallel with the rotation axis so that the flat portion is switched to the suction action depending on the rotational position. One end is configured to connect to an arc-shaped intake passage connected to a vacuum pump provided on one side fixed metal that axially mounts the bottom folding air drum.When the flat portion rotates upward, its intake port becomes a bearing. It is connected to the metal air intake passage, and the flat part is adsorbed immediately after the fold line attached to the bottom sticking piece of the envelope body that is transferred.

The gluing device is composed of a roll equipped in a gluing box and a gluing roll that applies glue in a horizontal straight line to the surface of the envelope body near the fold line at the bottom of the envelope body. The crease line given in advance is usually composed of a scoring roll and an anvil roll provided with embossing blades along the axial direction of the circumference of rotation.

[0011]

[Action]

 This invention relates to a rotary bag making machine, in which a bottom folding air drum is rotated in association with the rotation of a creasing roll that makes a fold line between the bottom main body of the envelope body and the bottom fold line, and the bottom fold line is transferred from the bottom side of the envelope. When the bottom strip of the envelope body comes in, the flat part provided on the body is rotated to the upper side, and immediately after the folding line of the bottom strip of the envelope body is inserted into the flat part of the bottom folding air drum through the intake port. , The bottom strip is bent in a reverse shape upward from the folding line through the stepped portion, and is rotated with the end protruding from the outer periphery of the drum, and at the same time, the glued roll is attached. When glue is applied to the bottom surface of the envelope body along the fold line and passes underneath the pressing member, the bottom patch from the outer peripheral surface of the drum is pushed down by the pressing member from the fold line and slides into contact, forming a superposed state. Vertically paired adhesive rolls or bottom pressing bells that rotate in contact with each other vertically It is pressed through between can be completely adhered.

[0012]

【Example】

 An embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a bottom folding device in a rotary bag-making machine according to the present invention, and 1 is an envelope body that is respectively transferred by a molding section of the rotary bag-making machine. A crease roll that gives a fold line to the bottom sticky piece 3 of FIG. 3 passes the gap between the anvil roller 2 and the bottom sticky piece 4 of the envelope body 3 to give a fold line 5. ⑶ 6 has a flat portion 7 formed by notching the outer circumference of the roll in the required width in the tangential direction and a step portion 8 at the front end of the flat portion in the rotation direction, and the flat portion 7 has an envelope main body 3 depending on the rotation position. It is an air drum for bottom folding provided with a plurality of suction ports 9 for sucking.

An appropriate number of intake ports 9 of the bottom folding air drum 6 are provided at intervals in the axial direction, and each is connected to an intake hole 10 that axially penetrates the body of the drum body. One end of the intake hole 10 has an arc shape which is connected to a vacuum pump provided on the inner surface of the bearing metal 11 on one side of the fixed bearing metals 11 and 11 ′ which are mounted on both sides of the bottom folding air drum 6. When the drum flat part 7 is rotated to the upper position, the surface of the flat part 7 is sucked by a necessary rotation angle range. is there.

Above the center line of the bottom folding air drum 6, there is a suitable gap through which the envelope body 3 can pass, and a bottom sticking piece 4 to which a folding line 5 is provided in advance is provided along the folding line 5. A holding member 13 to be folded is disposed on the envelope main body 3 to which the glue is applied, and the holding member 13 is attached so that it can be adjusted up and down to some extent.

Reference numeral 14 denotes a bottom sizing device, which is composed of a transfer roll 16 installed in a sizing tank 15 and a sizing roll 17 for gluing the envelope body 3 in parallel with the folding line 5 of the bottom sticking piece 4. . Reference numeral 17a is a glue application portion which is applied to the surface of the envelope body near the bottom sticking piece by the gluing roll. 18 is a drive transmission gear of the bottom folding air drum 6 and the bottom glue device, and 19 is transferred to the envelope body 3. , The bottom folding air drum and bottom glue front and back movement device that moves the machine forward and backward to match the timing by rotating the gear, 20 is the front and back movement device only for bottom glue, and 21 is the continuous bag making machine. A cutting device for cutting the molded product into a single-sized envelope body 3 and a pulling roll 22 for the envelope body.

FIG. 2 is a cross-sectional view of the main part of the bottom folding device of the present invention. When the flat part 7 of the bottom folding air drum 6 rotates upward, the folding line of the bottom sticking piece 4 of the envelope body sent. Immediately after 5 is adsorbed to the flat portion 7 like the imaginary line of the bottom folding drum 6, the bottom sticking piece 4 that was in contact with the outer peripheral surface of the drum has the step edge 8 at the front end of the flat portion 7. It is bent from the fold line 5 through and is bent in an inverted shape as shown in FIGS. 3 (A) to 3 (B) so that the bottom sticking piece 4 projects so as to stand upright on the outer peripheral side of the drum, and the pressing member 13 is pressed. It is folded down by passing under. The level difference between the flat portion 7 and the peripheral surface at the front end in the rotational direction is preferably about 3 mm.

FIG. 4 is an exploded perspective view of the bottom folding air drum, and FIG. 5 is a sectional view of the bottom folding air drum when assembled. The intake ports 9 provided in the flat portion 7 of the bottom folding air drum 6 are axially spaced from each other. An appropriate number of them are connected to the air intake holes 10 that are provided through the drum body in the axial direction. One end portion of the intake hole 10 is provided on the inner side surface of one of the fixed bearing metals 11 on both sides for axially mounting the bottom folding air drum 6, as shown in the sectional view of FIG. 5 and FIG. Further, it is configured so as to communicate with the intake passage 12 formed in an arc shape, and the intake passage 12 is connected to the vacuum pump through the intake pipe connection port 12a, and the flat portion 7 of the drum is When it is rotated to the upper position, the surface of the flat portion 7 is sucked by the required rotation angle range.

Above the drum passing through the center line of the bottom folding air drum 6, there is a proper gap through which the envelope body 3 can pass, and the bottom sticking piece 4 to which the folding line 5 is attached in advance is set on the folding line 5. A holding member 13 to be folded is disposed on the envelope body 3 glued along the holding member 13. The holding member 13 is formed by an L-shaped holding plate whose lower portion is bent horizontally, though it is illustrated. It suffices that the bottom sticking piece 4 is pushed down when passing through the envelope body 3. Therefore, it is possible to arrange the bar or roll on the drum in the axial direction so that the bar or roll is attached so as to be adjustable up and down.

Also, in the other fixed bearing metal 11 ′ in the present device, an arc-shaped air supply passage (not shown) that communicates with the other end of the intake hole 10 according to the rotational position of the bottom folding air drum. After the bottom sticking piece 4 is folded on the envelope body 3, the intake hole 10 is connected to the air supply passage and the suction state is switched to the air supply state, so that the envelope body 3 is in a fixed position. It is possible to more securely and easily attract and release the flat surface 7 to the flat portion 7.

FIG. 6 is a plan view showing the envelope body 3 which is provided with the fold line 5 and which is provided with the glue application section 17 a to which the glue is attached by the glue roll 17 and sent out.

[0021]

[Effect of device]

 According to the present invention having the above-described configuration, the fold line is provided in advance on the bottom piece of the envelope, and immediately after the fold line of the envelope is adsorbed by the flat portion provided with the intake port of the bottom folding air drum, Since it is possible to rotate the bottom strip by bending it from the folding line through the edge and projecting it to the outer peripheral surface of the drum, when passing just below the holding member arranged above it, the drum is rotated by a very small amount. You can naturally fold the bottom sticker on the envelope body.

Therefore, as compared with the conventional bottom folding device, since there is no pushing into the V-groove by the folding blade, the structure is extremely simple. , You can easily fold and attach a clean envelope. Therefore, it is possible to perform bottom set molding of envelopes suitable for a printing machine that does not cause troubles such as a set when printing and stacking and feeding it sequentially to the printing machine. obtain.

In addition, the structure of this device is simpler than any of the above-mentioned conventional ones, and the number of parts is small, and the vertical adjustment and adjustment of the pressing member are easy and easy depending on the paper thickness of the envelope body. Yes, it only requires a simple operation to match the feed of the first envelope and the rotation position of the flat part of the air drum, it does not require special troublesome technique and skill for adjustment, and the configuration is simple and it is not damaged. There are few effects, such as the ease of maintenance of the bottom-applying machinery for envelopes.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bottom folding device in a rotary bag making machine according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the present invention.

FIG. 3 is an explanatory diagram showing a bottom-folded state by this device (A).
FIG. 3B is an explanatory view showing a state before bottom folding, and FIG.

FIG. 4 is an exploded perspective view showing a bottom folding air drum and a holding member of the apparatus.

FIG. 5 is a sectional view of the assembly.

FIG. 6 is a plan view of an envelope with a broken line.

FIG. 7 is an explanatory view of a conventional bottom folding device.

FIG. 8 is a perspective view of an envelope formed by a conventional bottom folding device.

[Explanation of symbols]

 1 Roll with a streak 2 Anvil roll 3 Envelope body 4 Bottom sticker 6 Air drum for bottom folding 7 Flat part 8 Step surface part 9 Suction port 10 Suction hole 11 Fixed bearing metal 12 Intake passage 12a Intake pipe connection port 13 Holding member 14 Bottom glue device 15 glue tank 16 transfer roll 17 glue roll 17a glue applying part 18 drive transmission gear 19 bottom folding air drum and bottom glue forward / backward moving device 20 bottom glue only forward / backward moving device 21 single-envelope cutting device 22 envelope body Pulling roll

Claims (3)

[Scope of utility model registration request] 1. An envelope is formed by notching the outer periphery of the roll in a tangential direction to a desired width to form a flat portion and a step portion at the front end of the flat portion in the rotation direction, and the flat portion is enveloped at a predetermined timing depending on the rotation position. An air drum for bottom folding provided with a suction port for sucking the main body, and a bottom adhesive strip, which has a proper gap through which the main body of the envelope can pass and which is pre-folded, is formed on the outer periphery of the drum. A bottom folding device for a rotary bag making machine, characterized in that a pressing member for folding down is arranged on an envelope main body glued along. 2. The bottom folding device for a rotary bag making machine according to claim 1, wherein the pressing member is a pressing plate. 3. The bottom folding device of a rotary bag making machine according to claim 1, wherein the pressing member is a roll.