JPH09300480A - Apparatus for forming straw for drink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for forming a straw for drinks, capable of forming a recessed locking part on a straw member partly or throughout the entire periphery thereof. SOLUTION: An apparatus for forming a straw for drinks has a straw transfer unit and a forming pin transfer unit 4, both being supported by a rotary shaft 12. The forming pin transfer unit 4 has a forming pin holding body 5 reciprocable and rotatable in an axial direction. A planetary gear 42 fixed to the forming pin holding body 5 holding a forming pin 3 meshes with a sun gear 41 supported on the rotary shaft 12 with the aid of a bearing 43. A forming mold 6 is composed of an inner peripheral mold 7 and an outer peripheral mold 8, which are provided apart from each other so as to have a gap therebetween at a substantially equal interval smaller than an outer diameter of a straw member 1. The straw member 1 passes through the gap between the inner peripheral mold 7 and the outer peripheral mold 8 while rotating, and a recessed locking part is formed on the entire periphery of the straw member 1 by plastic deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beverage straw forming apparatus for forming a locking portion on a straw member made of a thermoplastic material.

[0002]

2. Description of the Related Art Conventionally, a telescopic straw has a double straw structure in which an inner tube is slidably inserted into an outer tube,
It is known that the end portion of the outer tube is configured to have a reduced diameter, and the end portion of the inner tube is configured to have an expanded diameter. When using it as a telescopic straw, pull out the inner tube from the outer tube and lock the expanded end of the inner tube to the reduced diameter end of the outer tube to lengthen the straw itself and use it for drinking etc. To be done.

Further, when the inner pipe is pulled out from the outer pipe and the expanded end of the inner pipe is locked in the expanded end of the outer pipe to be used in an expanded state, both of the expanded pipes are locked. In the
Although the inner tube cannot be pulled out from the outer tube any more,
Since there is no locking part in the contracting direction, the inner tube will enter the outer tube with a slight pushing force. Therefore, the outer tube is formed with a locking portion with which the enlarged diameter end of the inner tube is locked in a state where the inner tube is pulled out from the outer tube.

For example, Japanese Examined Patent Publication (Kokoku) No. 5-82809 discloses a stopper forming device for a beverage straw. The stopper forming device for a beverage straw includes a straw holding drum that rotates around a central axis and has a plurality of straw receiving recesses around it, and a straw holding drum that rotates in synchronism with the straw holding drum to form a protrusion that faces the straw receiving recess. A pin drum having a large number of receiving pins having a small-diameter portion for receiving action, a pushing mechanism for inserting the outer straw held by the straw holding drum into the receiving pin, a straw holding drum, and a pin drum And a pair of stopper molds positioned between the two, and the receiving pin serves as a receiving mold for the stopper mold when the stopper mold is pressed against the outer straw to mold the stopper. Further, in the above-described stopper forming device for a beverage straw, the interval formed by the stopper forming mold is such that the interval on the inlet side, which is guided to pass the outer straw, is larger than the diameter of the outer straw, and the outer straw passes and exits. The distance on the exit side is smaller than the diameter of the outer straw, and the distance is gradually reduced from the entrance side to the exit side.

Further, Japanese Patent Publication No. 8-2593 discloses a stopper forming device for beverage straws. A stopper forming device for a beverage straw includes a holding member that holds and moves an outer straw, a straw end holding cylinder that moves in synchronization with a holding member that faces the outer straw held by the holding member, and a holding member. It has a pair of edge-shaped heat forming dies, which are located between the straw end holding cylinder and fixed at intervals so that the outer straws can pass through, and the gap between the edge-shaped heat forming dies is larger than the diameter of the outer straw. It is gradually narrowed from the interval to a slightly smaller interval, and the straw end holding cylinder is also used as the outer straw end portion reduced diameter type.

[0006]

However, in the beverage straw stopper forming apparatus disclosed in the above-mentioned respective publications, the interval formed by the stopper forming molds is gradually increased from the inlet side of the outer straw toward the outlet side. Since the dimensions are made smaller, the area of the stopper forming die for forming the stopper for the outer straw becomes only a very short distance, and the stopper forming die forms the stopper for the outer straw in a short time only. This means that the stopper does not have a completely acute angle, but has a gentle chevron shape. Therefore, even if the inner straw is pulled out from the outer straw, the stopper cannot reliably perform the locking function, and if a slight pushing force is applied to the inner straw, the inner straw will enter the outer straw. There was a drawback.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to construct a retractable straw by an inner tube and an outer tube, and by applying a straw member having a locking portion to the outer tube, the outer tube becomes the inner tube. Even if the concave locking portion formed on the outer pipe in the state where the inner pipe is pulled out securely locks the end portion of the inner pipe and a pushing force of the inner pipe to the outer pipe, that is, an external force, acts, the inner pipe An object of the present invention is to provide an apparatus for forming a beverage straw that forms a stepped concave locking portion having an acute angle on the entire circumference or a part of a circumferential direction of a straw member forming the outer tube so as not to enter the outer tube.

According to the present invention, a rotating shaft rotatably supported by a supporting frame, a straw carrying device supported by the rotating shaft holding a straw member made of a thermoplastic material, and a straw carrying device arranged to face the straw carrying device. Further, the molding pin transfer device supported by the rotating shaft is held by the pin holding device so as to be capable of reciprocating in the axial direction, and is rotatably held by the rotation of the molding pin transfer device, and the molding pin is held by the straw. A molded pin holder that holds the member so that it can be inserted into and removed from the member, and is attached to the support frame in a predetermined region of the running path of the straw member that is inserted into the molded pin to form a concave locking portion on the straw member; A forming die including an inner peripheral die and an outer peripheral die, which are arranged in an arc shape at equal intervals smaller than the outer diameter of the straw member, and the straw member is thermoformed. Heating device for heating because the mold to a molding apparatus drinking straw made of.

Further, the molding pin is formed with a concave groove in a region where the straw member is inserted to mold the concave locking portion on the straw member and which is pressed by the molding die.

Further, the forming die is supported by a supporting rod fixed to the supporting frame, and has an edge portion corresponding to the concave groove of the forming pin for forming the locking portion on the straw member.

Further, the inner peripheral die and the outer peripheral die constituting the molding die extend over a region of 90 ° or more in the circumferential direction.

The heating device is composed of heaters fixed to the inner die and the outer die of the forming die, respectively.

Further, the straw conveyer comprises a rotary drum with a groove in which grooves extending in the axial direction are formed to respectively support the plurality of straw members. There is provided a straw pressing member which is released in a molding region of the concave engaging portion to the member.

Further, the molding pin holder has the molding pin attached to one end thereof, and the rolling element rotatably attached to the other end thereof. Furthermore, the rolling pin of the molding pin holder rolls on a fixed cam that is attached to the support frame and extends in the circumferential direction, so that the molding pin holder is rotated. The forming pin is inserted into and removed from the straw member by reciprocating while rotating about the drum in the axial direction.

Further, in the molding pin transfer device, a rotary drum holding the molding pin holder so as to be capable of reciprocating in the axial direction and relatively rotatable, a planetary gear respectively provided on the molding pin holder, and the support frame. And a sun gear that is fixed to the rotary shaft via a bearing and meshes with the planetary gear.

Alternatively, the forming pin transfer device may include a rotary drum that holds the forming pin holder so as to be axially reciprocable and relatively rotatable, a planetary gear provided on the forming pin holder, and the planetary gear. And a ring gear that meshes with the planetary gear and is detachably attached to the support frame. When the molding pin transfer device is configured as described above, if the ring gear is engaged with and fixed to the support frame, the planetary gear rotates in reverse to the rotation of the sun gear, and the straw is rotated. A concave locking portion is formed on the entire circumference of the member.
When the ring gear is disengaged from the support frame, the planet gear does not rotate, but the ring gear, the planet gear, and the sun gear rotate integrally, and the straw member is formed by the forming die. A pair of opposing concave recesses are formed.

As described above, the beverage straw forming apparatus according to the present invention is arranged such that the forming die is in a non-rotating state over a predetermined region in the arc-shaped running path of the straw member in which the forming pin is inserted. In order to form the locking portion on the member, it is composed of an inner peripheral die and an outer peripheral die which are equally spaced over a predetermined distance, and in particular, the molding pin holder rotates or does not rotate with respect to the molding pin transfer device. Therefore, the straw member passes through the forming die while rotating or non-rotating, and the stepped concave locking portion having an acute angle is plastically deformed to the straw member over the entire circumference or partially of the straw member. It is formed. Therefore, if the straw member is used as an outer tube, when the inner tube is pulled out from the outer tube,
The recessed locking portion can function as a stopper that prevents the inner tube from being retracted into the outer tube again.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a beverage straw forming apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a beverage straw forming apparatus according to the present invention, FIG. 2 is a partially cutaway sectional view of an essential part of the beverage straw forming apparatus of FIG. 1, and FIG. FIG. 4 is a side view of a beverage straw forming apparatus, FIG. 4 is an enlarged cross-sectional view of a forming die in the beverage straw forming apparatus of FIG. 1, and FIG. 5 is a rotation of a forming pin holder in the beverage straw forming apparatus of FIG. It is a schematic explanatory drawing which shows a mechanism.

The beverage straw forming apparatus according to the present invention mainly comprises a rotary shaft 12 rotatably supported by a support frame 14 through a bearing 35, a straw member 1 made of a thermoplastic material, and a rotary shaft 12. The straw-conveying device 2 supported by the, the forming-pin conveying device 4, which is arranged to face the straw-conveying device 2, rotates in synchronization with the straw-conveying device 2, and is supported by the rotating shaft 12, and the forming-pin conveying device 4. The forming pin holder 5 and the straw member 1, which are held so as to be reciprocally movable in the axial direction, are held so as to be rotatable with the rotation of the forming pin transfer device 4, and hold the forming pin 3 in the straw member 1 so as to be removable. Arranged in a non-rotatable state on a support frame (not shown) in a predetermined area on the arc-shaped running path of the straw member 1 inserted into the molding pin 3 to form the concave locking portion 9 And a molding die 6 including an inner peripheral die 7 and an outer peripheral die 8 which are arranged with a gap 30 which is smaller than the outer diameter of the straw member 1 and which are arranged in an arc shape at substantially equal intervals. In order to do so, it comprises a heating device 10 for heating the mold 6.

The straw conveyor 2 is composed of a rotary drum 25 fixed to the rotary shaft 12. Rotating shaft 12
Are rotatably supported by the support frame 14 via bearings 35. The rotating drum 25 has a large number of axially-extending grooves 3 in which the straw members 1 are placed and which are spaced apart in the circumferential direction.
9 is provided. The straw member 1 is sequentially placed at the placement position in the groove 39 of the straw conveying device 2, passes through the gap 30 between the inner peripheral die 7 and the outer peripheral die 8 of the molding die 6, and is molded at the discharge position. It is transported so as to be discharged. In addition, the straw member 1 placed in the groove 39 of the straw conveying device 2
In order to hold and hold the straw, a straw pressing member 27 fixed to a support frame (not shown) is installed at a position facing the molding die 6 and on the outer peripheral side of the straw conveying device 2. The straw pressing member 27 rotates the straw member 1 so that the straw member 1 is inserted into the forming pin 3 and the concave locking portion 9 is formed on the entire circumferential surface of the straw member 1. In the molding region where the straw member 1 is inserted into the member 1 and molded by the molding die 6, the straw pressing member 27 releases the straw member 1 without pressing it so that the straw member 1 can rotate together with the rotation of the molding pin 3. A notch (not shown) is formed on the inner surface thereof. Therefore, when the straw member 1 is pulled out from the forming pin 3 after the straw member 1 is molded, the straw member 1 can be held in the groove 39 of the straw conveying device 2 by the straw pressing member 27.

The forming pin transfer device 4 is composed of rotating drums 21 and 33 fixed to the rotating shaft 12 with bolts, keys, etc., and is configured to rotate in synchronization with the rotation of the straw conveying device 2. In the rotary drums 21 and 33, the molding pin holders 5 are arranged in through holes 45 and 46 formed in the circumferential direction so as to be spaced apart from each other via bearings (not shown). The molding pin holder 5 is capable of reciprocating in the axial direction with respect to the rotary drums 21 and 33, and at the same time, the rotary drum 2
1, 33 are supported so as to be rotatable relative to each other. The molding pin holder 5 has the molding pin 3 exchangeably attached to one end thereof, and the ball 16 of the rolling element rotatably attached to the other end thereof. The stepped portion of the molding pin holder 5 on the side to which the molding pin 3 is attached serves as a contact surface of the end surface of the straw member 1 when the straw member 1 is inserted into the molding pin 3 and serves as a reference position for the straw member 1. An insertion reference surface 40 for restricting the above is formed.

A planetary gear 42 is fixed to the molding pin holder 5 between the flange portion 47 provided on the molding pin holder 5 and the rotary drum 33 by keying or the like. The sun gear 41 is fixed to the support frame 14 via a fixed cam 13 and supported on the rotating shaft 12 via a bearing 43. That is, the fixed cam 13 and the sun gear 41 are fixed by the bolts 44, and the sun gear 41 is supported in a non-rotating state. The planetary gear 42 has a rotating shaft 12
Is slidably engaged with the sun gear 41 so as to be slidable and rotatable in the axial direction. The sun gear 41 does not rotate, and the planetary gear 42 meshes with the sun gear 41 and rotates on the sun gear 41 to rotate. In addition, the molding pin holder 5 causes the cam surface 38 of the cam 13 by the spring force of the return spring 17 via the ball 16.
Pressed on. The return spring 17
It is arranged outside the molding pin holder 5 between the end surface of the flange portion 26 of the molding pin holder 5 and the receiving surface inside the rotary drum 21.

In this embodiment, the planetary gear 42 revolves on the sun gear 41 and revolves by the rotation of the rotary drums 21 and 33. Therefore, the molding pin holder 5 interposes the balls 16 on the cam surface 38 of the fixed cam 13. The straw member 1 supported by the forming pin 3 passes through the gap 30 of the forming die 6 while rotating (spinning), and is concave along the entire circumference of the straw member 1. The locking portion 9 will be formed. Therefore, the forming region of the arc-shaped running path of the forming die 6 with respect to the straw member 1 is formed with the concave engaging portion 9 on the entire circumference of the straw member 1. Therefore, the forming region is formed so that the forming pin holder 5 makes one rotation or more. Therefore, it is necessary to set the length to at least the circumferential length of the straw member 1.

The fixed cam 13 is supported by the rotary shaft 12 via a bearing 34. Ball 1 of fixed cam 13
The position of the support rod 20 is adjusted with respect to the adjustment screw 24.
It is performed by adjusting and moving with respect to the support frame 14. The forming pin holder 5 is reciprocated by the reciprocating device 11 so that the forming pin 3 held by the forming pin transfer device 4 can be inserted into and removed from the straw member 1.
That is, the reciprocating device 11 includes the fixed cam 13 that is adjustably positioned on the support frame 14 via the support rod 20.
And a ball 16 rolling on the cam surface 38 of the fixed cam 13 and provided at one end of the molding pin holder 5.

In this beverage straw forming apparatus, the forming die 6 comprises an inner peripheral die 7 and an outer peripheral die 8 which are supported by a rotating shaft 12 in a stationary state, and the inner peripheral die 7 and the outer peripheral die 8 are straws. It is set so as to extend in an arc shape with a gap 30 that is smaller than the outer diameter of the member 1 and that is substantially equally spaced. The inner peripheral die 7 of the molding die 6 is supported in a stationary state by the rotary shaft 12 via a bearing 37, and the outer peripheral die 8 of the molding die 6 is supported by the support frame 14
It is supported in a stationary state by a support rod 15 fixed to. Further, the inner peripheral die 7 of the molding die 6 is supported by a machine base (not shown) via a support frame 36. The inner peripheral die 7 and the outer peripheral die 8 of the molding die 6 are each formed with an edge portion 23 corresponding to the concave groove 22 of the molding pin 3 for molding the concave locking portion 9 in the straw member 1.

A taper surface 29 is formed at the inlet 31 of the straw member 1 between the inner die 7 and the outer die 8, and the straw member 1 is introduced into the gap 30 between the inner die 7 and the outer die 8. It is easily formed. In addition, in the molding region of the gap 30 between the inner peripheral die 7 and the outer peripheral die 8, the straw member 1 is plastically deformed from elastic deformation and then solidification is started, and the concave locking portion of the straw member 1 having a desired shape is formed. Considering that 9 is reliably molded, for example, depending on the size of the rotating drums 21 and 25, for example, it extends over an angle θ of a region of approximately 90 ° or more in the circumferential direction equal to the entire circumferential length of the straw member 1. It is preferable. In addition, in this embodiment, the inner peripheral die 7 and the outer peripheral die 8 are configured as separate bodies, but they may be configured as an integral structure by a support body or the like.

In this beverage straw forming apparatus, the axial position of the inner peripheral die 7 of the forming die 6 is set by the support frame 1
The support rod 15 fixed to the No. 4 can be controlled by adjusting the adjusting screw 18. At this time, the peripheral die 8
In the axial position setting of, the position setting of the support frame 36 with respect to the machine base may be controlled corresponding to the axial position setting of the inner peripheral die 7. Further, when setting the radial position of the inner peripheral die 7 of the molding die 6, the support rod 15 is set to the support frame 14.
If the hole penetrating through is formed as a long hole, the support rod 15 can be finely adjusted and controlled in the radial direction with respect to the support frame 14. The radial position of the inner peripheral die 7 is set by
The gap 30 between the inner peripheral die 7 and the outer peripheral die 8 can be controlled, and the axial position of the inner peripheral die 7 controls the formation position of the concave locking portion 9 with respect to the straw member 1. be able to.

Further, in the molding pin 3, a concave groove 22 is formed in a region where the straw member 1 is inserted and pressed by the molding die 6 in order to mold the concave locking portion 9 in the straw member 1. The heating device 10 is composed of heaters fixed to substantially the central regions of the inner peripheral die 7 and the outer peripheral die 8 of the molding die 6, respectively. The heat transfer from the heating device 10 to the forming die 6 is configured such that the temperature is substantially high in the substantially central region between the inner peripheral die 7 and the outer peripheral die 8 and is slightly lower on both sides. Therefore, when the straw member 1 is introduced into the gap 30 from the introduction side inlet 31 of the forming die 6, the straw member 1 is elastically deformed first, and is softened and plastically deformed toward the substantially central region to form the concave locking portion 9. Is molded, solidification is started as it progresses to the outlet 32, and is discharged from the outlet 32. Straw member 1
The shape of the concave locking portion 9 to the straw member 1 is controlled by the shape of the concave groove 22 of the molding pin 3 and the shape of the edge portion 23 of the inner peripheral die 7 and the outer peripheral die 8 in molding the concave locking portion 9 into the straw member 1. And the inner peripheral die 7 and the outer peripheral die 8 by the heating device 10.
It is also controlled by the heating temperature of.

Since the beverage straw forming apparatus is constructed as described above, the balls 16 of the forming pin holder 5 are rotated on the fixed cam 13 which is attached to the support frame 14 and extends in the circumferential direction. It rolls with the rotation of 21. The ball 16 of the molding pin holder 5 rolls on the circumferentially extending cam 13 attached to the support frame 14 as the rotary drum 21 rotates, so that the molding pin holder 5 is moved relative to the rotary drum 21. And the reciprocating shaft 17 reciprocates in the axial direction against the spring force of the return spring 17, so that the forming pin 3 attached to the forming pin holder 5 rotates and the straw member 1 placed in the groove 39 of the straw carrier 2 is rotated.
Is inserted into. The forming pin 3 is inserted until the end surface of the straw member 1 comes into contact with the insertion reference surface 40 of the forming pin holder 5, and the straw member 1 inserted into the forming pin 3 there.
Is introduced into the gap 30 between the inner peripheral die 7 and the outer peripheral die 8 of the molding die 6, and is elastically deformed from the inlet 31 to the gap 30 without being immediately softened at the inlet 31 between the inner peripheral die 7 and the outer peripheral die 8. To enter. Next, the straw member 1 is provided with the gap 30 of the molding die 6.
Is softened and plastically deformed in a substantially central region thereof, and finally discharged from the outlet 32 of the forming die 6, and the straw member 1 is solidified to form the concave locking portion 9. Furthermore, the straw carrier 2
When the molding pin transfer device 4 rotates with the rotation of the rotary shaft 12, the molding pin holder 5 is retracted by the spring force of the return spring 17 according to the fixed cam 13, and is placed in the groove 39 of the straw conveyor device 2 from the molding pin 3. The placed straw member 1 is pulled out, and then the straw member 1 is transferred from the straw transfer device 2 to another transfer device (not shown).

Next, another embodiment of the beverage straw forming apparatus according to the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a partially cutaway sectional view showing another embodiment of the essential part of the beverage straw forming apparatus according to the present invention, and FIG. 7 is a view showing rotation of the forming pin holder in the beverage straw forming apparatus of FIG. It is an expanded sectional view showing a planetary gear set.
Compared with the above-mentioned embodiment, this embodiment has the same configuration and the same function except that the mounting structure of the sun gear 41 to the rotary shaft 12 is different, and therefore the same parts are designated by the same reference numerals. are doing.

In this embodiment, the molding pin holder 5 includes
A planetary gear 42 is fixed between the flange portion 47 provided on the molding pin holder 5 and the rotary drum 33 by keying or the like, and a sun gear 41 is fixed on the rotating shaft 12 by keying or the like. . The planetary gear 42 is slidably engaged with the sun gear 41 so as to be slidable in the axial direction of the rotating shaft 12. In the molding pin transfer device 4,
The molding pin holder 5 is held by the rotating drums 21 and 33 so as to be axially reciprocable and relatively rotatable.
The ring gear 50 is detachably attached to the support frame 14 directly (not shown) or via a sleeve 51, and meshes with the planetary gear 42. Therefore, the molding pin holder 5 is configured to rotate or stand around the sun gear 41 while sliding in the axial direction via the planetary gear 42. In this embodiment, the sun gear 41 is rotating with the rotary shaft 12, so that the planet gears 42 are reversed with respect to the sun gear 41 or are stationary on the sun gear 41.

In the beverage straw forming apparatus of this embodiment, the ring gear 50 is directly slid to support the support frame 14.
(Not shown) or by sliding the ring gear 50 to the support frame 14 by sliding the sleeve 51, the planetary gear 42 rotates in the direction opposite to the rotation of the sun gear 41. Become. Therefore, together with the planetary gear 42, the molding pin 3 revolves around the sun gear 41 while revolving around the sun gear 41, and the straw member 1 inserted in the molding pin 3 has the gap 3 of the molding die 6.
Since it passes through 0 while rotating, the straw member 1 is provided with a concave locking portion 9 over the entire circumference. Alternatively, the ring gear 50 is slid on the support frame 14 by sliding the sleeve 51.
, The planetary gear 42 does not rotate,
The ring gear 50, the planetary gear 42, and the sun gear 41 rotate as a unit, and the straw member 1 inserted in the forming pin 3 passes through the gap 30 of the forming die 6 without rotating, so that the straw member 1 is vertically moved. A pair of opposed partial concave locking portions 9 are formed in the. Therefore, in this embodiment, the engagement / disengagement operation of the ring gear 50 and the support frame 14 forms the concave engaging portion 9 formed on the straw member 1 over the entire circumference, or a pair of opposed partial concave engaging portions. It is possible to select either to form the stopper 9.

[0033]

Since the beverage straw forming apparatus according to the present invention is configured as described above, if the sun gear attached to the rotating shaft is made stationary and the planetary gear meshing with the sun gear is rotated, The molding pin is inserted into the straw member while rotating, and the molding region is separated from the straw member in a predetermined region by the molding die at substantially equal intervals.
The straw member inserted into the molding pin passes while co-rotating with the molding pin, so that the straw member can be surely formed with a stepped concave locking portion having a step with an acute angle over the entire circumference. Alternatively, in the beverage straw forming apparatus according to the present invention, when the planetary gear meshing with the sun gear is rotated in reverse by rotating the sun gear attached to the rotary shaft together with the rotary shaft, a concave locking is performed over the entire circumference of the straw member. Can be formed, or when the planetary gear that meshes with the sun gear is integrally rotated in a non-rotating state, a pair of opposed concave locking portions can be formed in the straw member.

Therefore, when the straw member produced by the beverage straw forming apparatus is applied to the outer tube of the stretchable straw, the concave locking portion formed on the outer tube with the inner tube pulled out from the outer tube. Prevents the inner tube from entering the outer tube even if the end portion of the inner tube is securely locked to the step portion having an acute angle and the pushing force of the inner tube to the outer tube is less than a predetermined value. Also, after pulling out the inner tube from the outer tube and extending it,
Again, if you want to insert the inner tube into the outer tube and shrink it, it is not easy to push the inner tube straight into the outer tube, but if you rotate both to push the inner tube into the outer tube, The inner tube can be easily pushed into the outer tube by the screwing action.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an apparatus for forming a beverage straw according to the present invention.

FIG. 2 is a partially cutaway sectional view showing an embodiment of a main part of the apparatus for forming a beverage straw of FIG.

3 is a side view of the beverage straw forming apparatus of FIG. 1. FIG.

FIG. 4 is an enlarged cross-sectional view showing a forming die in the forming apparatus for the beverage straw of FIG.

5 is an enlarged cross-sectional view showing a planetary gear device that rotates a forming pin holder on its axis in the beverage straw forming apparatus of FIG. 2;

FIG. 6 is a partially cutaway sectional view showing another embodiment of the main part of the apparatus for forming a beverage straw according to the present invention.

7 is an enlarged cross-sectional view showing a planetary gear device that rotates a molding pin holder in the beverage straw molding device of FIG. 6 about its axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Straw member 2 Straw conveying device 3 Forming pin 4 Forming pin transfer device 5 Forming pin holder 6 Forming die 7 Inner peripheral die 8 Outer peripheral die 9 Recessed locking portion 10 Heating device 12 Rotating shaft 13 Fixed cam 14 Support frame 15 Support rod 16 Ball 17 Return Spring 20 Support Rod 21, 25 Rotating Drum 22 Recessed Groove of Molding Pin 23 Edge of Mold 41 Sun Gear 42 Planetary Gear 43 Bearing 50 Ring Gear

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masami Abe 1-3-15 Miyagi, Adachi-ku, Tokyo Toyo Cap Manufacturing Co., Ltd.

Claims (10)

[Claims] 1. A rotary shaft rotatably supported by a support frame, a straw carrying device supported by the rotary shaft holding a straw member made of a thermoplastic material, and a straw carrying device arranged opposite to the straw carrying device. A molding pin transfer device supported by a rotation shaft, axially reciprocally held by the pin holding device, and rotatably held by the rotation of the molding pin transfer device, and the molding pin in the straw member. A retaining member for retaining the insert pin in a removable manner, a straw member attached to the support frame in a predetermined region of a traveling path of the straw member inserted into the forming pin to form a concave locking portion in the straw member, and the straw. A forming die including an inner peripheral die and an outer peripheral die, which are spaced apart from each other in an arc shape at equal intervals smaller than the outer diameter of the member, and the heat-forming of the straw member. A beverage straw forming device comprising a heating device for heating a forming die. 2. The molding pin, wherein the straw member is inserted to mold the concave locking portion on the straw member, and a concave groove is formed in a region pressed by the molding die. An apparatus for forming a beverage straw as described. 3. The molding die is supported by a support rod fixed to the support frame, and has an edge portion corresponding to the concave groove of the molding pin for molding the locking portion on the straw member. Item 1. A beverage straw forming apparatus according to Item 1 or 2. 4. The beverage straw according to claim 1, wherein the inner peripheral die and the outer peripheral die forming the forming die extend over a region of 90 ° or more in a circumferential direction. Molding equipment. 5. The beverage straw according to claim 1, wherein the heating device is composed of heaters fixed to the inner peripheral die and the outer peripheral die of the forming die, respectively. Molding equipment. 6. The straw conveying device comprises a rotary drum with a groove in which grooves extending in the axial direction are formed to respectively support the straw members, and the straw member presses and holds the straw members in the respective grooves. The device for forming a beverage straw according to any one of claims 1 to 5, further comprising a straw pressing member that is released in a forming region of the concave locking portion on the member. 7. The beverage according to claim 1, wherein the molding pin holder has the molding pin attached to one end thereof and a rolling element rotatably attached to the other end thereof. Straw forming equipment. 8. The molding pin holder is provided by rolling the rolling element of the molding pin holder along with the rotation of the rotary drum on a fixed cam that is attached to the support frame and extends in the circumferential direction. The beverage straw forming apparatus according to claim 7, wherein the forming pin is inserted into and removed from the straw member by reciprocating while rotating in the axial direction with respect to the rotating drum. 9. The molding pin transfer device includes a rotary drum that holds the molding pin holder so as to be axially reciprocable and relatively rotatable, a planetary gear provided on the molding pin holder, and the support frame. The beverage straw forming apparatus according to any one of claims 1 to 8, which comprises a sun gear fixed to the rotary shaft via a bearing and meshed with the planetary gear. 10. The forming pin transfer device includes a rotary drum that holds the forming pin holder so as to be axially reciprocable and relatively rotatable, a planetary gear provided on the forming pin holder, and the planetary gear. 9. A sun gear that meshes with and is fixed to the rotating shaft, and a ring gear that meshes with the planetary gear and is detachably attached to the support frame. Beverage straw forming equipment.