JPH07195587A - Cylindrical body forming device - Google Patents

Abstract

PURPOSE:To make a device simple and compact by moving intermittently a plurality of supporting mechanisms for supporting sheet-shaped blanks wound in the cylindrical shape in the state of overlapping its both ends, and delivering a plurality of supporting mechanisms successively into stations for forming a cylindrical body. CONSTITUTION:A body-cladding molding device is provided with a turret 51 with eight supporting devices 50 having pressing arms 61 and supporting arms 71 mounted along the outer periphery of the device almost at equal intervals. The turret 51 is rotated intermittently almost at 45 deg. in the clockwise direction with a horizontal shaft as its center, and the eight supporting devices 50 are constituted to stop successively at eight stations A-H disposed along the outer periphery of the turret 51. Sheet-shaped blanks 3 are supplied and the body- cladding forming is carried out at the station A, and heat fusion bonding is carried out at stations B-F, while cylindrical sheets 3 are released at the station G and supporting arms 71 are repeatedly moved at the station F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body in which a sheet-like blank is wound around a mandrel so that both ends thereof overlap with each other, and the overlapping ends are joined together to form a tubular body. Regarding molding equipment,
In particular, it is most suitable for forming a tubular body portion such as a tubular paper portion in a container such as a paper cup.

[0002]

2. Description of the Related Art Conventionally, a paper cup consisting of a generally frusto-conical conical paper and a generally circular bottom paper fitted and fixed near the small-diameter side end opening of the cylindrical paper is continuously formed. There is known a paper cup molding machine as shown in FIGS.

In this conventional paper cup forming machine, as shown in FIG. 8, eight metal mandrels 1 each having a generally frustoconical outer peripheral surface are mounted at equal intervals along the outer periphery thereof. Equipped with a turret 2. The mandrels 1 are arranged on the turret 2 such that the axial center direction of the mandrel 1 substantially coincides with the radial direction of the turret 2, and the ends of the mandrels 1 on the larger diameter side face the center of the turret 2. In addition, the turret 2 is shown in FIG.
Intermittently rotate about 45 ° counterclockwise at
The eight mandrels 1 are configured to be sequentially stopped at eight stations A to H arranged along the outer periphery of the turret 2 with the intermittent rotation of the turret 2. And these eight stations A
In H to H, as will be described below, various processing or inspection steps necessary for forming the paper cup are repeatedly performed at every intermittent rotation of the turret 2.

(1) Station A In this station A, a bottom paper supply arm 11 for supplying the bottom paper 10 to the mandrel 1 is arranged so as to be able to move forward and backward with respect to the mandrel 1. The bottom paper 10 includes a substantially circular flat plate portion 10a and the flat plate portion 10a.
And an annular narrow margin portion 10b formed by integrally rising from the outer periphery. Then, the bottom paper supply arm 11 holds the bottom paper 10 in which the margin portion 10b is directed away from the central axis of the turret 2 and advances toward the mandrel 1 to form a recess on the outer surface of the mandrel 1. Bottom paper holding portion 1a configured by
Since the bottom paper 10 is fitted to the mandrel 1 as shown in FIG. 9, the bottom paper 10 is air chucked to the mandrel 1. Then, the bottom paper supply arm 11 moves backward and returns to the original position shown in FIG.

(2) Station B In this station B, the bottom paper holding unit 1 of the mandrel 1 is installed.
A bottom sheet detecting means 12 for detecting whether or not the bottom sheet 10 is accurately held is arranged in a. The bottom sheet detecting means 12 may be an optical sensor having a light emitting element and a light receiving element, and the intermittent rotation of the turret 2 continues only when the bottom sheet 10 is detected by the optical sensor. Be seen.

(3) Station C In this station C, a conveyor mechanism 4 and a blank positioning table 5 for supplying the sheet-shaped blank 3 for forming a generally frustoconical tube paper to the mandrel 1 are arranged. There is. The blank 3 is composed of a slightly curved rectangular sheet member such that a pair of marginal portions formed of both ends thereof are connected to each other to form a substantially frustoconical tube paper. The surface is coated with a thermoplastic resin.

The conveyor mechanism 4 comprises a pair of upper and lower belt conveyors. The blank 3 sandwiched between the pair of belt conveyors is transferred in the direction toward the center of the turret 2 and sequentially supplied to the blank positioning table 5. Also,
During the supply of the blank 3, the left and right ends of the blank 3 are heated by the heating means 6 such as a pair of left and right gas burners arranged on both the left and right sides of the conveyor mechanism 4, and the thermoplastic resin on the surface is melted. When the blank 3 supplied to the blank positioning table 5 is positioned at a predetermined position on the blank positioning table 5 by the fixed pin 5a and the movable pin 5b, the blank positioning table 5 is
The turret 2 advances toward the center of the turret 2 and moves below the mandrel 1 to hold the blank 3 at a predetermined position below the mandrel 1.

Then, the blank 3 is pressed against the lower end of the mandrel 1 at an intermediate position between the left and right ends of the blank 3 by a pressing lever such as a blank pressing lever shown in FIG. 3 described later.
Then, a pair of left and right winding arms 7 which are arranged diagonally below the blank 3 and which are curved in a substantially arcuate shape are rotated diagonally upward from both left and right sides toward the axis of the mandrel 1. Therefore, the blank 3 is wound in a generally frustoconical shape on the outer peripheral surface of the mandrel 1, and the pair of marginal portions, which are the left and right ends thereof, are superposed on each other, and thus the blank 3 becomes a generally frustoconical tube.

In this case, since the substantially rectangular notch 20 is formed in the front part of the blank positioning table 5, the winding arm 7 pivots diagonally upward through the notch 20. Therefore, the blank positioning table 5 in the forward position does not hinder the obliquely upward rotation of the winding arm 7. Also, the bottom sheet 10
9 is fitted into the bottom paper holding portion 1a of the mandrel 1 and air-chucked to the mandrel 1, as shown in FIG. 9, so that it does not interfere with the winding operation of the blank 3. As shown in FIG. 9, the blank 3 is wound around the outer peripheral surface of the mandrel 1 such that the end portion of the tubular paper 3 on the smaller diameter side is slightly projected from the front end surface of the mandrel 1. At the station F described later, the end of the tubular paper 3 on the smaller diameter side is bent and the tubular paper 3
This is because it does not interfere with the bottom bending operation of attaching the bottom paper 10 to the bottom.

Then, the blank positioning table 5 moves backward and returns to the original position shown in FIG. 8, and the rubber pads 8 attached to the tip of the presser lever 9 are superposed on each other as shown in FIG. The pair of overlap portions thus formed are pressed to weld each other. In this case, as described above,
Since the end of the paper cylinder 3 on the small diameter side slightly projects from the front end surface of the mandrel 1, the ends of the pair of overlap portions on the small diameter side are not pressed by the pad 8 of the presser lever 9.

Therefore, at this station C, the blank 3 is formed into a substantially frustoconical cylindrical shape, and a pair of marginal portions at both ends of the blank 3 are fixed to each other to form a blanket.

(4) Stations D and E In these stations D and E, a first bottom heating arm 17 and a second bottom heating arm 18 are arranged so that they can move forward and backward with respect to the mandrel 1, respectively. There is.

At these stations D and E, these first and second bottom heating arms 17, 18 are provided.
Since each of them advances and inserts their front end faces into the bottom paper 10 held by the bottom paper holding portion 1a of the mandrel 1, the ends of the bottom paper 10 and the cylinder paper 3 located around the bottom paper 10 on the smaller diameter side. And the parts are respectively heated. It should be noted that these bottom heating arms 17 and 18 move backward after the above heating and return to their original positions shown in FIG.

(5) Station F In this station F, a bottom folding arm 14 is arranged, as shown in detail in FIGS. 9 and 10.

In FIG. 9, the bottom paper 10 is the mandrel 1
Bottom push-out arm 1b fitted to the bottom paper holding section 1a
It is air chucked. In addition, blank 3 is
By winding around the outer peripheral surface of the mandrel 1 and stacking a pair of overlapped portions on top of each other on the mandrel 1, a substantially conical tube paper is formed. The end of the tube paper 3 on the smaller diameter side slightly projects from the tip surface of the mandrel 1. Further, the pad 8 of the presser lever 9 presses the pair of marginal portions of the tubular paper 3 except for the end portion on the smaller diameter side. Further, the bottom bending arm 14 is arranged so as to be able to move forward and backward with respect to the tip end surface of the mandrel 1 (and thus the bottom paper 10).

At this station F, the bottom paper pushing arm 1b and the bottom folding arm 1 of the mandrel 1 are provided.
By moving 4 and 4 from the return position shown in FIG. 9 to the forward movement position shown in FIG. 10, the end portion (that is, the bottom portion) of the paper cylinder 3 on the smaller diameter side is bent inward.

That is, when the bottom pushing arm 1b advances outward along the axial direction of the mandrel 1, the bottom paper 10 held by the bottom paper holding portion 1a of the mandrel 1 becomes
The margin portion 1 is pushed out from the bottom paper holding portion 1b and
0b is brought into contact with the inner surface of the tube paper 10. When the bottom folding arm 14 moves forward as described above and is pressed against the bottom sheet pushing arm 1b through the flat plate portion 10a of the bottom sheet 10, the bottom of the tube 3 is formed on the front surface of the bottom folding arm 14. It is bent inward while being guided by the molding recess 19. For this reason, the margin portion 10b of the bottom paper 10 is
Are sandwiched between the bottom of the paper cylinder 3 and the portion of the paper cylinder 3 adjacent to the bottom. Further, due to this sandwiching, the margin portion 10b is welded to the bottom portion and the adjacent portion, respectively. Then, the bottom folding arm 14 moves backward and returns to the original position shown in FIG. 9, but the bottom paper pushing arm 1b of the mandrel 1 is held in that forward position shown in FIG.

Therefore, at this station F, bottom molding is performed in which the bottom paper 10 is attached to and fixed to the tube paper 3.

(6) Station G In this station G, the bottom pressure bonding arm 15 is arranged so as to be able to move forward and backward with respect to the mandrel 1.

In this station G, the bottom crimping arm 15 moves forward so that the central portion thereof has the flat plate portion 1 of the bottom paper 10.
The bottom paper pushing arm 1b is pressure-bonded via 0a, and its peripheral portion is pressure-bonded to the outer surface of the bottom of the paper cylinder 3. Then, in this state, the laminated portion of the bottom portion of the paper cylinder 3 and the margin portion of the bottom paper 10 is sandwiched and pressed from both inside and outside by the pair of knurls formed in the central portion and the peripheral portion, respectively. The margins of the bottom paper 10 are firmly welded to the bottom of the cylinder paper 3, and as a result, the cylinder paper 3 and the bottom paper 1 are
An unfinished paper cup consisting of 0 and 0 is molded. Then, the bottom pressure bonding arm 15 moves backward and returns to the original position shown in FIG. 8, but the bottom paper pushing arm 1b of the mandrel 1 is returned.
Is held in the forward movement position shown in FIG.

(7) Station H This station H has a paper cup take-out arm 16
Are arranged so that they can move forward and backward with respect to the mandrel 1.

In this station H, first, the bottom paper pushing arm 1b of the mandrel 1 in the forward movement position shown in FIG. 10 further advances to remove the paper cup consisting of the cylinder paper 3 and the bottom paper 10 from the mandrel 1. Push it out. Then, the paper cup take-out arm 16 moves forward to come into contact with the bottom paper 10, and when the unfinished paper cup is air-chucked, moves backward to take out the paper cup from the mandrel 1 and transfer it to a predetermined position. Also, the bottom paper pushing arm 1b
Moves backward and returns to the original position shown in FIG.

The unfinished paper cup obtained through various processing or inspection steps in the above-mentioned stations A to H has its end on the large-diameter side of the tube paper 3 outward with a curling machine (not shown). It is curled and finished into a finished paper cup.

[0024]

In the conventional paper cup forming machine shown in FIGS. 8 to 10, at the station F, the end portion of the tubular paper 3 on the smaller diameter side is bent and the bottom portion 10 is formed on the tubular paper 3. The end of the tube paper 3 on the smaller diameter side is slightly projected from the tip end surface of the mandrel 1 so as not to interfere with the bending operation of the bottom part for mounting. Therefore, since the small-diameter side ends of the pair of overlap portions of the paper tube 3 are not pressed by the pad 8 of the presser lever 9, they are not held between the mandrel 1 and the pad 8 of the presser lever 9, and therefore, In addition, there is a possibility that the pair of overlap portions at the end portion on the smaller diameter side are not firmly welded to each other.

In order to correct such a defect, the inventor of the present invention performs the upholstery forming at the station F at the station C in the conventional paper cup forming machine shown in FIGS.
It has been conceived that it is carried out by a body forming device which is an auxiliary device provided separately from the paper cup forming machine of the conventional example so that it can be performed by a device different from the bottom forming performed in (1). In this case, as in the case of the paper cup molding machine of the conventional example, the body forming device is attached to the turret along the outer periphery thereof with a plurality of mandrels at substantially equal intervals, and the turret is rotated intermittently. By doing so, it is conceivable that these plural mandrels are sequentially fed to stations for forming the body.

However, in the case of the above-mentioned structure, the bulk and weight of the intermittently rotating portion including the plurality of mandrels are large, and the drive mechanism of the intermittently rotating portion is compact. Since this is not possible, the configuration of the entire body forming device becomes complicated and large.

[0027]

SUMMARY OF THE INVENTION The present invention has been invented to solve such a problem, in which a sheet-shaped blank is wound around a mandrel so that both ends thereof are overlapped with each other. In a tubular body forming apparatus configured to form a tubular body by joining both ends, a plurality of support mechanisms for supporting the sheet-like blank in a state where both ends thereof overlap each other are intermittently provided. The plurality of supporting mechanisms are configured to be moved and sequentially fed to a station for forming a tubular body, the mandrel on which the sheet blank is wound, and the sheet for the station for forming the tubular body. Blank winding means for winding the blanks around the mandrel, and the intermittent movement of the support mechanism. More, in which the support mechanism is configured to transfer to the station from the next station for supporting quality ゝ the cylindrical body molded in a state where both ends of the sheet-like blank are overlapped with each other.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a body forming device for a paper cup forming machine will be described with reference to FIGS. In this embodiment, the same parts as those of the conventional example shown in FIGS. 8 to 10 are designated by the same reference numerals, and the description thereof will be omitted as necessary.

Although FIG. 1 schematically shows the whole of the above-mentioned upholstery forming apparatus, this upholstery forming apparatus is shown in FIGS.
The paper cup forming machine of the conventional example shown in FIG. 0 for performing the upholstery forming at the station C, and the paper as a main device having a configuration similar to that of the paper cup forming machine of the conventional example. It constitutes an auxiliary device of the cup forming machine.

That is, the paper cup forming machine as the main device in this embodiment is the station A for supplying the bottom sheet, the station B for detecting the bottom sheet, and the bottom portion in the paper cup forming machine of the conventional example shown in FIG. Stations D and E for heating, station F for bottom folding,
Some or all of stations G for bottom crimping and H for paper cup removal may be provided. Further, the paper cup forming machine as the main device is replaced with the station C for forming the body in the paper cup forming machine of the conventional example shown in FIG. A cylinder paper supply station for supplying the cylinder paper 3 obtained from the molding apparatus is provided.

The body forming apparatus in this embodiment is shown in FIG.
As shown in FIG. 5, a support mechanism 50 having a holding arm 61 and a support arm 71 that constitute a heat seal bar.
Is equipped with eight turrets 51 mounted at substantially equal intervals along the outer periphery thereof. Also, this turret 5
1 is clockwise about the horizontal axis in FIG.
The turret 51 is intermittently rotated by 5 °, and the eight sets of the support mechanisms 50 are intermittently rotated by the eight stations A to H arranged along the outer periphery of the turret 51. It is configured to stop sequentially. And
In the station A, the sheet blank 3 is supplied and the body is stretched and formed, and in the stations B to F, the pair of margins, which are the left and right ends of the paper tube 3, are heated and welded successively. At station G, the paper cylinder 3 is taken out, and at station H, the support arm 71 is moved back.

As shown in FIG. 2, the support mechanism 50 includes a guide block 5 attached to the inner surface of the turret 51.
4, the guide block 54 is provided with thrust bearings 52 and 53, respectively. The pressing arm 61 is reciprocally supported by the thrust bearing 52 in an axial direction that is substantially coincident with the radial direction of the turret 2, and a heater is embedded at the tip of the thrust bearing 52 so that a heat-sealing piece is provided. A constraining pressing piece 66 is provided. The support arm 71 is reciprocally supported by the thrust bearing 53 in an axial direction substantially parallel to the axial direction of the pressing arm 61, and its tip portion is bent to form the support portion 71a. Is formed into an L-shape as a whole.

The pressing arm 61 is constantly urged upward in FIG. 2 by a return spring 65 interposed between the pressing arm 61 and the guide block 54. The pressure adjusting spring 64 is interposed between the operating arm 67 and the pressure adjusting spring 64. A rotary wheel 63 as a cam follower is attached to one end of the operating arm 67, and the rotary wheel 63 is pressed against the cam surface of the first operating cam 62 by the urging force of the pressure adjusting spring 64. The support arm 71 is constantly urged downward in FIG. 2 by a return spring 74 interposed between the support arm 71 and a chassis portion 75 fixed to the turret 51. And, in the middle part of the support arm 71,
A rotary wheel 73 as a cam follower is attached, and the rotary wheel 73 is pressed against the cam surface of the second actuating cam 72 by the urging force of the return spring 74.

At the station A, the sheet blank 3
Various mechanisms necessary for the feeding of the material and the forming of the body are arranged.

That is, in this station A, FIG.
As in the case of the station C of the conventional paper cup molding machine shown in FIG. 1, a conveyor mechanism 4 including a pair of upper and lower belt conveyors 4a and 4b and a blank positioning table 5 are arranged. Then, the blank 3 is held between the pair of belt conveyors 4a and 4b, transferred in a direction substantially parallel to the axial direction of the mandrel 22 arranged in the station A, and sequentially transferred to the blank positioning table 5. Supplied. Further, when the blank 3 supplied to the blank positioning table 5 is positioned at a predetermined position of the blank positioning table 5 by the fixed pin 5a and the movable pin 5b as in the case of FIG. It advances in a direction substantially parallel to the axial direction of 22 and moves to below the mandrel 22, and holds the blank 3 at a predetermined position below this mandrel 22. In addition, in the present embodiment, it is not necessary to provide a pair of left and right heaters arranged on both the left and right sides of the conveyor mechanism 4 in the case of the conventional example shown in FIG.
This is because the pair of marginal portions of the paper tube 3 can be subsequently heat-welded by the pressing arm 61 forming the heat seal bar.

The mandrel 22 is shown in FIGS. 1 and 3 to 6.
Is attached to the chassis 21 as described below with reference to FIG.

That is, the chassis 21 has a structure shown in FIGS.
The guide block 23 is fixed, and a pair of through holes 44 are formed in the guide block 23. Two sets of thrust bearings 45 are provided in the pair of through holes 44, and a pair of guide shafts 24 are supported by the two sets of thrust bearings 45 so as to be reciprocally movable in the axial direction. There is.

Since the mandrel 22 is attached to one end of each of the pair of guide shafts 24 as shown in FIG. 6, the mandrel 22 cannot rotate about its axis, but these guide shafts 24 cannot be rotated. It is reciprocally movable in the left-right direction in FIG. Then, when the turret 51 rotates intermittently, the axial center direction of the mandrel 22 is changed to the holding arm 61 at the station A.
Pressing piece 66 and supporting piece 71a of supporting arm 71
Of the mandrel 22 and the end portion of the mandrel 22 on the smaller diameter side is directed toward the moving direction side. The other ends of the pair of guide shafts 24 are connected to the rear mounting block 2 for connecting the guide shafts 24 to each other.
5 are attached respectively. Further, a front mounting block 32 is slidably mounted on the pair of guide shafts 24, and the front mounting block 32 includes:
The blank stopper 31 is fixed.

Mandrel 2 of front mounting block 32
A pair of adjustment bolts 33 are attached to the surface opposite to the second side, and the pair of adjustment bolts 33 are fixed by a nut 33a after the protrusion amount thereof is adjusted. Further, a pair of stopper operating levers 34 are arranged so as to face the pair of adjusting bolts 33, respectively, and the pair of stopper operating levers 34 are integrally connected to a common support shaft 46. A pair of spring mounting shafts 35 are mounted on the surface of the front mounting block 32 opposite to the mandrel 22 side.
A return spring 36 accommodated in the guide block 23 is interposed between the guide block 5 and the guide block 23. Therefore, the pair of stopper operating levers 34
Is held in a state where its tip is in contact with the tip of the adjusting bolt 33.

As shown in FIGS. 3 to 5, the blank holding lever 37 is integrally connected to the support shaft 46, so that the blank holding lever 37 is supported by the support shaft 46.
It is rotatable about the fulcrum. Then, a rubber pad 38 is provided at the tip of the blank pressing lever 37.
Is attached.

The front end of the mandrel operating lever 27 is arranged opposite to the rear mounting block 25, and the base end of the mandrel operating lever 27 is integrally connected to the support shaft 48. Further, between the guide block 23 and the rear mounting block 25, a pair of return springs 26 each having one end inserted into the guide block 23 are interposed, and the rear mounting block 25 is connected by the pair of return springs 26. It is always urged toward the right side of FIG.
Therefore, the rear mounting block 25 is pressure-bonded to the tip of the mandrel operating lever 27.

The rear mounting block 25 includes an air tube 4
7 are connected to each other, and the air pipe 47 communicates with the air chamber 22b of the mandrel 22 through the air hole 25a of the rear mounting block 25 and the center hole 24a of the pair of guide shafts 24, respectively. Further, the mandrel 22 is provided with a plurality of air holes 22c extending from the air chamber 22b to the outer peripheral surface of the mandrel 22.

At the upper end of the mandrel 22, a notch 22a having a shape into which the supporting portion 71a of the supporting arm 71 can be just inserted is formed. Further, below the mandrel 22, a pair of left and right winding arms 7 which may have the same structure as the case of the conventional example shown in FIG. 8 is arranged. The pair of winding arms 7 is connected to the chassis 21.
Is rotatably supported by a support shaft 49 attached to the. The pair of winding arms 7 are pushed up by push-up rods (not shown) connected to the winding arms 7, respectively,
The support shaft 49 is rotated diagonally upward from both the left and right sides toward the shaft center of the mandrel 22, and the pressing surfaces thereof are pressed against the outer peripheral surface of the mandrel 22 via the blank 3.
Therefore, the pressing surfaces of the pair of winding arms 7 are formed in a substantially semi-circular shape with the same diameter as the outer periphery of the central portion of the mandrel 22.

Next, the operation of the stretcher forming apparatus configured as described above will be described. At the eight stations of this stretcher forming apparatus, as will be described below, various types of sheets required for forming a cardboard are formed. The processing steps and the like are repeatedly performed for each intermittent rotation of the turret 51.

(1) Station A At the time when the body forming process is started in this station A, the various mechanisms and support mechanisms 50 arranged in this station A are held in the states described below.

That is, the blank positioning table 5 is shown in FIG.
The mandrel 2 is held in the return position as shown by the solid line in FIG.
2, the blank pressing lever 37, the blank stopper 31, and the winding arm 7 are also held at the return position shown in FIG. In addition, the support arm 7 of the support mechanism 50
Since 1 is held at the return position shown in FIG. 2, the support portion 71a composed of its tip is held in the notch 22a of the mandrel 22. further,
Since the pressing arm 61 is held at the return position shown in FIG. 2, there is a space between the pressing piece 66 of the pressing arm 61 and the support portion 71a of the support arm 71 as shown by the solid line in FIG. A sufficiently large gap is formed.

In the station A, from this initial state, first, as described above, the blanks 3 sequentially supplied by the conveyor mechanism 4 and the blank positioning table 5 are held at predetermined positions below the mandrel 22. At this time, since the blank stopper 31 is in the return position shown in FIG. 3, the blank 3 is positioned by bringing its front end portion into contact with the blank stopper 31 in this return position.

Next, since the support shaft 46 rotates forward in the clockwise direction in FIG.
Similarly, the forward rotation is performed around 6 as a fulcrum, and for this reason, the spring attachment shaft 35, the attachment block 32, and the blank stopper 31 are integrally moved forward by the urging force of the return spring 36 to the position shown in FIG. At the same time, the blank presser lever 37 is pivoted forward in the clockwise direction in FIG. 3 with the support shaft 46 as a fulcrum in conjunction with the forward pivotal movement of the support shaft 46, so that the pad attached to the blank presser lever 37 is attached. As shown in FIG. 4, the reference numeral 38 holds the blank 3 against the lower end of the mandrel 22 at an intermediate position between the left and right ends thereof.

Then, a pump (not shown) is installed in the air pipe 47.
By sucking air from the mandrel 22, the air chamber 22b of the mandrel 22, the central hole 24a of the guide shaft 24, and the rear mounting block 25 are sucked from the air hole 22c of the mandrel 22.
Air begins to be sucked through the respective air holes 25a. Then, the pair of winding arms 7 respectively rotate forward and backward from the chain line position in FIG. 7 to the solid line position with the support shaft 49 as a fulcrum. Therefore, the blank 3 is wound around the outer peripheral surface of the mandrel 22 in a generally frustoconical shape, and a pair of the marginal portions of the left and right ends thereof are superposed on each other as clearly shown in FIGS. 4 and 7. It becomes a truncated cone paper tube.

In this case, the pair of winding arms 7
Since one of the two (the winding arm 7 on the right side in the case of FIG. 4) rotates forward before the other, the upper and lower relations of the pair of margin portions, which are the left and right ends of the blank 3, are always unique. To be decided. Further, since the air is sucked from the air holes 22c of the mandrel 22, there is no slack in winding the blank 3 around the outer peripheral surface of the mandrel 22 by the winding arm 7. Further, since the blank stopper 31 moves forward to the position shown in FIG. 4 and retracts with respect to the blank 3 as described above, the front end portion of the blank 3 is wrapped around the blank 3 when the blank 3 is wound.
No scratches and damage. Furthermore, FIGS.
As in the case of the conventional paper cup forming machine shown in FIG. As shown in, the pair of margins of the paper tube 3 can be wrapped around the outer peripheral surface of the mandrel 22 so as to be substantially accommodated in the front and rear ends of the upper end of the mandrel 22.

Then, the blank positioning table 5 moves backward and returns to the original position as shown in FIG. Further, as shown by a chain line in FIG. 2, when the first actuating cam 62 moves forward, the pressing piece 66 of the pressing arm 61 advances toward the supporting portion 71a of the supporting arm 71, and this supporting Part 7
Since the pair of margin portions of the paper tube 3 are elastically pressed against the la by the biasing force of the pressure adjusting spring 64, the pair of margin portions are heat-welded to each other. In this case, the support 7
Since 1a exists over the entire length of the inner side surfaces of the pair of allowance portions, and the pressing piece 66 exists over the entire length of the outer surface of the pair of allowance portions, the total length of the pair of allowance portions is the same as that of the support portion 71a. Pressing piece 66
It is elastically sandwiched between and and heated and welded.

Then, since the support shaft 46 rotates counterclockwise in FIG. 4, the blank stopper 31 returns to the original position together with the spring mounting shaft 35 and the front mounting block 32 as shown in FIG. , Blank presser lever 3
The pad 7 and the pad 38 are also returned to their original positions as shown in FIG. 5, and the pressing of the blank 3 onto the lower end of the mandrel 22 is released. Along with this, the pair of winding arms 7 respectively return-turn from the solid line position in FIG. 7 to the chain line position.

Next, air is supplied from the air pipe 47 to the air hole 25a of the rear mounting block 25, and this air is supplied to the central hole 24a of the guide shaft 24 and the mandrel 2 as well.
Since it is guided to the outer peripheral surface of the mandrel 22 through the air chambers 22b and the air holes 22c of the second mandrel 22, the space between the outer peripheral surface of the mandrel 22 and the inner surface of the paper tube 3 is diffused so that the inner surface of the paper paper 3 is The outer peripheral surface of 22 is prevented from firmly adhering. Further, together with this, the support shaft 48 rotates in the clockwise direction in FIG. 4 together with the mandrel operating lever 27,
The rear mounting block 2 by the urging force of the return spring 26
5, the pair of guide shafts 24 and the mandrel 22 move forward from the returning position of FIG. 4 to the position of FIG. In this case, the mandrel 22 moves in the axial direction toward the end portion on the larger diameter side. Further, the pair of overlapped portions of the paper cylinder 3 is elastically held by the support portion 71a of the support arm 71 and the holding piece 61a of the holding arm 61, and the lower portion thereof is held as shown in FIG. Since the blank stopper 31 prevents the mandrel 22 from moving to the right in FIG. 5, it is relatively removed from the mandrel 22 as the mandrel 22 moves to the right in FIG. Is left behind.

Then, since the turret 22 is rotated by about 45 ° in the clockwise direction in FIG. 1 as described above, the supporting mechanism 50 which has been in the station A until now supports the tube paper 3 as follows. Move towards station B. At the same time, the supply of air to the air tube 47 is interrupted, and the support shaft 48 further rotates in the counterclockwise direction in FIG.
The mandrel 22 returns to the original position shown in FIG. 3 together with the rear mounting block 25 and the pair of guide shafts 22.

(2) Stations BF In these stations BF, the paper cylinder 3 is elastically held by the supporting portion 71a of the supporting arm 71 and the pressing piece 66 of the pressing arm 61 and is subsequently heated. It is welded. Further, this heat welding is similarly performed while the support mechanism 50 is supporting the tube paper 3 and moving between the stations A to G.

Therefore, in this embodiment, since the blank or the cylinder paper 3 can be heated for a long time by the pressing arm 61 which constitutes the heat sill bar, the blank or the cylinder paper 3 is particularly heated by another heating means. do not have to.

(3) Station G In this station G, a cylinder paper receiving plate 81 for taking out the cylinder paper 3 is arranged.

The cylinder paper receiving plate 81 may be composed of a rotary disc rotatable about a vertical axis, and the rotary disc is formed with a plurality of circular openings along its outer periphery. You may The diameters of these circular openings are approximately equal to the diameter of the intermediate portion between the upper end and the lower end of the tube paper 3. Further, the plurality of circular openings are such that when the support portion 71a of the support arm 71 passes through the circular openings, the base end side portion of the support arm 71 is changed from one surface of the paper tube receiving plate 81 to the other surface. Since it has a notch which communicates with the outer circumference of the rotating disk so that it can be moved to, the notch is not a perfect circle but a part of the notch.

Therefore, in this station G, when the support mechanism 50 supporting the tubular paper 3 moves to this station G, the tubular paper 3 is placed in one of the tubular paper receiving plates 81. It is inserted into one circular opening from the lower end side of the smaller diameter side and is held by the paper tube receiving plate 81. Then, when the turret 22 makes the next intermittent rotation, the first actuating cam 62 returns and the holding arm 61 returns from the chain line position in FIG. 2 to the solid line position, and the second actuating cam moves. Since 72 moves forward and the support arm 71 moves downward in FIG. 2, the pressing arm 61 and the support arm 71 move to the next station H while the paper cylinder 3 is held by the paper cylinder receiving plate 81. You can move.

(4) Station H In this station H, since the second actuating cam 72 returns, the support arm 71 that has moved forward in the station G before it returns to the original position shown in FIG.

As described in detail above, in the stations A to F, the cylinder paper 3 obtained by performing the upholstery forming and the complete welding of the pair of margins is the cylinder paper receiving plate 81 in the station G. After being received by the cylinder paper receiving plate 81 and held by the cylinder paper receiving plate 81, the cylinder paper supply station of the paper cup molding machine as the main device (the station C for forming the jacket in the conventional paper cup molding machine shown in FIG. Equivalent to). Then, the tube paper 3 is fitted to the mandrel at this station, as in the case shown in FIG. Further, as in the case of the stations D to H of the conventional paper cup molding machine shown in FIG. 8, the paper cup is taken out from the paper cup molding machine as a main finished product.

In the above-mentioned embodiment, the substantially frustoconical cylindrical portion is formed from the sheet-shaped blank 3, but various shapes such as a substantially cylindrical shape, a generally rectangular prismatic shape, and a generally pyramidal truncated pyramid shape. It is also possible to form a tubular body having the shape of. Further, although the tubular paper portion of the paper cup is formed, the tubular portion of the box box can also be formed.

Further, in the above-described embodiment, the plurality of support mechanisms 50 are attached to the turret 51 along the outer circumference thereof at substantially equal intervals, and the turret 51 is rotated intermittently. Alternatively, a plurality of support mechanisms 50 may be attached to the endless chain having an elliptical shape, a rectangular shape, or the like, at substantially regular intervals, and the endless chain may be moved intermittently.

Further, in the above-described embodiment, both ends of the sheet-shaped blank 3 wound in a tubular shape and overlapping each other are supported by the support portion 71a of the support arm 71 and the pressing arm 61.
Although it is elastically sandwiched from both inside and outside by the pressing portion 66, the both ends may be elastically supported by a suction arm capable of adsorbing the vicinity of the both ends from the outside. Further, the pressing piece 6 of the pressing arm 61 is
Since the pressure adjusting spring 64 elastically presses the both ends by means of 6, it is not necessary to provide an elastic member such as rubber on the pressing piece 66.
Although it is not necessary to frequently replace the parts due to wear of the elastic member, it is not always necessary to do so. Further, although the heater is built in the pressing piece 66 of the pressing arm 61, the heater may be built in the supporting portion 71a of the supporting arm 71, or the heater may be built in both.

In the above embodiment, the pressing arm 61 is moved forward by the first actuating cam 62 and the support arm 71 is moved forward by the second actuating cam 72. The forward movement of the arm 61 and the support arm 71 can be performed reliably and easily,
The forward movement may be performed by another actuating mechanism other than the cam (for example, a link mechanism or a cylinder mechanism).

[0066]

According to the present invention, a plurality of support mechanisms for intermittently moving a plurality of supporting mechanisms for supporting a sheet-shaped blank wound in a tubular shape with both ends thereof overlapping each other are supported. The mechanism is configured so as to be sequentially fed to a station for forming a tubular body, and a mandrel for winding the sheet blank is provided at the station for forming the tubular body. Therefore, the mandrels are intermittently moved as compared with the case of the conventional example of FIG. 8 in which the mandrels are intermittently moved so that the mandrels are sequentially fed to a station for forming a tubular body. The bulk and weight of the portion to be moved can be greatly reduced, and the drive mechanism for the intermittently moving portion can be made compact, so that the overall structure of the tubular body molding apparatus can be made simple and compact. it can.

According to the third aspect of the invention, the sheet-shaped blank wound in a tubular shape can be pulled out from the mandrel by the intermittent movement of the support mechanism.
It is possible to simplify the structure for extracting the tubular blank wound from the mandrel.

Further, according to the invention described in claim 4, since both ends of the sheet-shaped blank which are overlapped with each other can be held from both inside and outside, it is possible to reliably support the sheet-shaped blank by the support mechanism. it can.

Further, according to the invention described in claim 5, even if the thickness of the support portion of the support arm is not particularly thinned, it is possible to make the outer peripheral surface of the mandrel substantially free of irregularities. It is possible to form a tubular body that substantially corresponds to the shape of the outer peripheral surface of the.

Further, according to the invention of claim 6,
Since the both ends of the sheet-shaped blank can be heated and welded by simply sandwiching the overlapping both ends by the support portion and the pressing portion, the heat welding can be performed easily and efficiently.

[Brief description of drawings]

FIG. 1 is a front view schematically showing the entire body forming apparatus in one embodiment in which the present invention is applied to the body forming apparatus of a paper cup forming machine.

FIG. 2 is a vertical cross-sectional view showing the support mechanism shown in FIG.

[Fig. 3] Fig. 1 in a state immediately before the forward movement of the winding arm.
3 is an enlarged front view of a portion of station A of FIG.

FIG. 4 is a view similar to FIG. 3 in a state immediately after the blanking arm is retracted after the winding arm moves forward.

FIG. 5 is a view similar to FIG. 3 immediately after the mandrel retracts.

6 is a cross-sectional view taken along the line I-I of FIG.

7 is a cross-sectional view taken along the line II-II of FIG.

FIG. 8 is a schematic plan view of a conventionally known paper cup molding machine.

9 is a sectional view taken along the line III-III in FIG. 8 in a state before the forward movement of the bottom bending arm.

10 is a sectional view taken along the line III-III in FIG. 8 in a state in which the bottom bending arm is in the forward movement.

[Explanation of symbols]

 3 blank (cylindrical paper) 7 winding arm 22 mandrel 22a notch 31 blank stopper 50 support mechanism 51 turret 61 presser arm 66 presser piece (presser part) 71 support arm 71a supporter

Claims (6)

[Claims] 1. A tubular body forming apparatus in which a sheet-like blank is wound around a mandrel so that both ends thereof are overlapped with each other, and the overlapping ends are joined together to form a tubular body. A plurality of support mechanisms for supporting the blank blank in a state where both ends thereof overlap each other are intermittently moved, and the plurality of support mechanisms are sequentially fed to a station for forming a tubular body. In the station for forming the tubular body, a mandrel around which the sheet blank is wound, and a blank winding means for winding the sheet blank around the mandrel are respectively provided, and by the intermittent movement of the support mechanism. , With the support mechanism in a state where both ends of the sheet-shaped blank overlap each other. Lifting quality ゝ station from so as to transfer to the next station the cylindrical body forming apparatus for the cylindrical body molding. 2. A sheet-shaped blank is wound around a mandrel in a generally frustoconical shape so that both ends thereof overlap each other,
In a tubular body forming apparatus configured to form a generally frustoconical tubular body by welding the overlapping both ends, a plurality of sheets for supporting the sheet blank in a state where the both ends overlap each other are provided. By intermittently rotating the turrets, the support mechanisms of which are provided at substantially equal intervals along the outer periphery thereof, the plurality of support mechanisms are sequentially fed to the station for forming the tubular body. Then, at the station for forming the tubular body, a mandrel having a generally frustoconical outer peripheral surface so that the sheet-like blank is wound into a generally frustoconical shape, and a sheet-like blank for winding the sheet-like blank around the mandrel. Blank wrapping means are respectively provided, and the support mechanism rolls the sheet blank by intermittent rotation of the turret. Cylindrical body forming apparatus from the station for supporting quality ゝ the cylindrical body molded in a state in which both end portions are overlapped with each other so as to transfer to the next station. 3. The mandrel axial center direction substantially coincides with the moving direction of the support mechanism at the station for molding the tubular body when the turret intermittently rotates, and the mandrel diameter The device according to claim 2, wherein the small-side end portion is directed toward the movement direction side during the intermittent rotation. 4. The support mechanism includes a support portion for supporting the overlapping both end portions from the inside, and a holding portion for holding the both end portions from the outside toward the support portion. 4. The apparatus according to claim 1, wherein both ends of the overlapped portion can be elastically held by the support portion and the pressing portion. 5. The apparatus according to claim 4, wherein a cutout portion for inserting the support portion is provided on the outer peripheral surface of the mandrel. 6. The apparatus according to claim 4, further comprising heating means for heating at least one of the pressing portion and the supporting portion.