JPH0481496B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention consists of an outer straw and an inner straw inserted into and out of the outer straw, and the overlapping ends of each straw engage with each other in an extended state. This invention relates to a detent molding device for a double straw, in which a detent is formed on the outer straw to prevent the mutually engaged parts of the inner and outer straws from being accidentally disengaged when the double straw is stretched and used.

[Conventional technology]

Up to now, various types of double straws have been proposed, which consist of an inner and an inner straw and whose overlapping ends engage with each other in the extended state (Utility Model Opening in 1973).
65784, Japanese Utility Model Application Publication No. 59-21284), and this application relates to a detent at the time of extension to prevent the mutual engagement portions of the inner and outer straws from being accidentally disengaged when this type of straw is extended and used. People have already made proposals (Utility Model Application No. 58-74156, Utility Model Application No. 59-177372)
Publication No.). A similar proposal is also described in Japanese Patent Laid-Open No. 82813/1983. In both of these cases, when the double straw is in an extended state, the rear end of the inner straw, which is provided at a predetermined position on the inner surface of the outer straw, is engaged with each other after the enlarged diameter side end of the inner straw passes over a protrusion that can be climbed over. The structure is such that they fit together.

However, no device has been proposed for manufacturing such a detent.

In addition, as shown in Japanese Patent Publication No. 52-38473, the production of a flexible drinking tube (straw) with a flexible portion consisting of a large number of circumferential grooves has been proposed. Although it is described that rolling is carried out by covering a core metal with a tube made of thermoplastic material and rolling it on a block or plate having a large number of teeth, the publication does not disclose a manufacturing apparatus. The multiple circumferential grooves of the flexible drinking tube do not require positional accuracy in the longitudinal direction of the tube.

[Problem that the invention seeks to solve]

In the case of the above-mentioned double straws with a detent when extended, when the inner straw is pulled out from the outer straw and the sloped ends of each are engaged to make the extended state, the detent provided on the inner surface of the outer straw If there is a gap between the edge of the enlarged diameter part and the detent due to the position of When inserting the straw or sucking a drink, the inner straw may wobble, and this may cause air leakage that prevents the drink from being sucked smoothly.

On the other hand, if the detent is in a bad position and the enlarged diameter end cannot overcome the detent, the problem arises that the detent is insufficiently secured and easily comes off. Therefore, the position of the detent of the inner straw formed on the outer straw must be precisely formed on the side of the reduced diameter portion of the outer straw, which is the engagement portion of the inner and outer straws. The present invention has been made in view of the above points, and it is an object of the present invention to provide a device that can accurately form a detent for the inner straw with respect to the outer straw of this type of double straw.

[Means for solving problems]

In the present invention, as described above, the outer straw 1 of the double straw is configured so that the respective ends of the inner and outer straws on the overlapping side engage with each other in the extended state.
An outer straw conveying processing drum 5 that conveys the outer straw so that it can be processed continuously while conveying the outer straw.
On the other hand, facing the side surfaces of a large number of grooves 3, 3... provided on the outer periphery for receiving the outer straws 1, the single grooves 3, 3, . . . A detent molding rod 8 in which a circumferential groove 6 and an outer straw diameter reduction side edge positioning portion 7 are integrally formed is rotatably provided, and a push guide 9 for the molding rod 8 is provided on the base frame 10 side. When the detent molding rod 8 advances to a predetermined position in the middle of its circumferential movement and is in the protruding state, the detent molding rod 8 moves forward and backward. A pair of detent forming rollers 12, 12 having a protrusion 11 on the outer periphery are pivotally supported on the base frame 10 so as to press the formed circumferential groove 6 from both sides, and the concave groove of the conveying processing drum 5 is The molding is performed so that the positioning portion 7 of the outer straw diameter-reducing side edge of the detent molding rod 8 enters into the drum side from the movement line t of the diameter-reducing side edge of the outer straw 1 which is received and held by the outer straw 1 and transferred. Move the rod 8 straight and attach the straw 1 to the core part 8a of the forming rod 8.
With the diameter-reducing end edge of the outer straw corrected in position by the straw edge positioning section 7, the outer straw is placed between the pair of detent forming rollers 12, 12 and the core metal part 8a of the forming rod. The outer straw 1 is configured to roll while pressing the outer wall of the outer straw 1 to form a detent 1a of the inner straw protruding from the outer wall of the outer straw 1 to the inside of the straw 1.

[Effect]

By doing so, the outer straw 1 is received and held in the concave groove 3 on the outer periphery of the conveyance processing drum 5, and while being conveyed, the outer straw 1 is inserted into the center of the detent molding rod 8 having a single circumferential groove 6. The straw edge positioning portion 7 of the molded rod 8 is placed over the metal portion 8a.
The end edge on the reduced diameter side is corrected in position, and while rolling in that state, the detent forming rod 8
A pair of detent forming rollers 12, 1 with protruding edges 11 facing each other on both sides of the circumferential groove 6 of the core metal portion 8a.
2, a groove is formed on the outer periphery of the outer straw 1, and an inner straw detent 1a is formed protruding from the inner wall surface of the groove. In this case, since the circumferential groove 6 of the core metal part 8a of the forming rod and the outer straw diameter reduction side edge positioning part 7 are integrally formed, the end edge abuts against the positioning part 7. The detent 1a can always be formed at a predetermined position from the end edge on the reduced diameter side with accurate dimensions on the outer straw 1.

〔Example〕

An embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a sectional view showing essential parts of the detent forming apparatus, and shows the front part of the - section in a side view showing the outer straw conveying processing drum equipped with the detent forming apparatus shown in FIG.

In the figure, reference numeral 5 denotes a drum for conveying an outer straw for detent forming, which has a large number of concave grooves 3 at the same pitch on its outer periphery for receiving and holding the outer straw 1, and conveys the outer straw. In this embodiment, a ring shape is symmetrically formed across a receiving groove 13 for a cutter 22, which will be described later, provided on the outer periphery so that it can be used when the production line is arranged in two rows in any double straw manufacturing apparatus. An internal gear 20 is provided around the inner surface of the central part of the outer peripheral wall 17, and the internal gear 20 is supported by three rollers 19. It is designed to be driven counterclockwise by a drive gear 21.
In addition, an intake hole 18 for suctioning and fixing the outer straw 1 by a suction box 25, which will be described later, is formed in the drum outer peripheral wall 17 so as to open at the bottom surface of the groove 3. Note that 14 is a groove into which a not-illustrated guide for transferring the outer straw 1 from the outer straw conveying processing drum is inserted. A disc-shaped cutter 22 is provided at the front center of the upper part of the drum 5 for conveying and processing outer straws, and is perpendicular to the drum surface. Two pieces of outer straw material 1' (see Fig. 6), which are conveyed while being held on the surface of the drum 5 by a circumferential guide 24 (described later), are securely held in the groove 3 during cutting. I am trying to make the cut using the same method. The circumferential guide 24 is provided to hold the outer straw received in the groove 3 on the outer circumferential surface of the drum 5 for conveying and processing the outer straw, but the circumferential guide 24 is also provided with the above-mentioned holding belt 23 and the suction box 25, which will be described later.
A transfer drum 15 from the hopper and a transfer drum 16 for carrying out the outer straw after detent forming are carried out from the outer straw conveyance processing drum 5 at a position other than the portion where the straw is held by the sponge straw holding roller 29. (See Figures 1, 4a and 4d).

A lateral guiding guide 26 (see FIG. 4a) is provided along the upper surface of the outer straw transport processing drum 5 to guide the outer straw 1 cut by the cutter 22 laterally (see FIG. 4a). After displacing the part to the movement line t of the end part, which is a predetermined position on the side of the drum, the outer position of the suction box 25 for suction and fixation, which is slidably provided in close contact with the inner surface of the drum outer peripheral wall 17. The outer straw 1 is conveyed by the suction box 25, and the straw 1 is conveyed while being sucked and fixed to the surface of the concave groove 3 through the intake hole 18. On the other hand, in parallel with the outer straw conveyance processing drum 5, the outer side of the straw conveyance processing drum 5 (left side in FIG. 1)
In this step, a detent molding rod 8 equipped with a core part 8a having a circumferential groove 6 for forming a detent on the outer straw 1 is attached to the concave grooves 3, 3 of the straw conveying processing drum 5. ... so that the axial center of the detent forming rod 8 and the axial center of the outer straw 1 fixed in the groove 3 are aligned with each other, and it is attached so that it can move back and forth freely from the side surface of the groove by a coil spring 28. An internal gear 2 provided on the inner circumferential surface of the holding drum 30 includes a detent molded rod holding drum 30 that is rotatably provided within the outer circumferential wall 30a.
0', it is installed to rotate in synchronization with the internal gear 20 of the outer straw conveyance processing drum 5 via coaxial idle gears 27, 27, etc. There is. The movement of the detent forming rod 8 toward the side surface of the concave groove 3 is controlled by a small-diameter guide roller 33 attached to the bearing portion 32 of the forming rod 8, which is fixed to the outer circumferential surface of the push-in guide holding cylinder 31 fixed to the base frame 10. This is done by being guided by a push-in guide 9. Further, after the outer straw 1 received and held in the concave groove 3 of the outer straw conveyance processing drum 5 is guided by the side guidance guide 26 and its edge moves to a predetermined movement line t,
The concave groove 3 is drawn by suction by the suction box 25.
When the reduced diameter side edge of the outer straw moves circumferentially along the predetermined line, the mandrel 8a fits into the outer straw 1 due to the straight movement of the detent molding rod 8 and moves along the moving line. The outer straw diameter reducing side edge positioning portion 7 of the forming rod 8 enters toward the drum side from t, and the outer straw 1 reaches a predetermined position relative to the ridge 11 of the detent forming roller 10, which will be described later.
It seems like it's being pushed in. In this way, the outer straw 1 is attached to the core part 8a of the detent forming rod 8.
is covered, and the diameter-reduced end edge 1b of the outer straw 1
is pushed in to a predetermined position, the detent molding rod 8 becomes the most protruding state, and the circumferential groove 6 of the protruding mandrel part 8a is pressed from both upper and lower sides to a predetermined position while moving circumferentially. A pair of detent forming rollers 12, 12 having a protrusion 11 on the outer periphery are attached to the base frame 1.
The inner gears 20 and 20' of the outer straw conveyance processing drum 5 and the detent molding rod holding drum 30 connect the lower detent coaxially with the idle gear via the idle gears 27 and 27. As the forming roller 12 is driven, the opposing upper forming roller 12 is connected to the lower forming roller 12 by a pulley 36 coaxial with the roller 12 being connected by a belt 37 to a pulley 35 coaxial with the lower forming roller 12. Driven at the same rotational speed. Further, the rotation of the detent forming rod 8 is performed by driving a rubber roller 34 provided coaxially with the mandrel part 8a on the opposite side of the mandrel part 8a of the molding rod. The outer peripheral speed of the outer straw 1 placed over the core metal part 8a of the rod is
On the other hand, the outer circumferential speed of the protruding edge 11 is made larger than the moving speed on the circumference of the groove 3 on the outer periphery of the drum 5 for conveying and processing the outer straw. That is, as shown in FIG. 3, the circumferential speed of the idle gear 27, which is close to the speed of circumferential movement of the groove 3, is increased by increasing the radius ratio (approximately 2 in the figure).
The flange 11 of the detent forming roller 12 is
While increasing the circumferential speed of A rubber roller drive belt 46 is suspended between the pulley 42 and a pulley 43 installed on the opposite side of the molding section, and the lower surface of the belt 46 is rotated. The non-return molding rod is brought into contact with the upper surface of a plurality of rubber rollers 34 that are pivotally supported on the circumference on the outer peripheral wall 30a of the holding drum 30, and the rubber rollers 34 are rotated at an increased speed to remove the core metal part of the molding rod coaxial with the rubber roller 34. The outer circumferential speed of the outer straw placed over the outer straw 8a and the outer circumferential speed of the protrusion 11 of the detent forming roller 12 are made approximately equal. By doing this, the outer wall of the straw is prevented from breaking when forming a detent on the inner surface of the outer wall of the outer straw, and the pair of forming rollers 1 at a predetermined position are prevented from breaking.
The straw outer wall is evenly distributed over the entire circumference of the outer straw 1, which is placed over the core metal part 8a of the forming rod that moves circumferentially and passes between the protrusion 11 and the circumferential groove 6. A detent is formed on the inner wall of the straw by recessing the portion. The outer straw 1 with the detent molded in this way is then pushed into the push guide 9 while the outer periphery of the straw is pressed by the straw pressing roller 29 made of sponge.
The push-in of the detent forming rod 8 is released, and the core part 8 of the forming rod 8 is released.
After the straw 1 is pulled out from the outer straw 1, the straw 1 with the detent formed thereon is conveyed to the next step by a transfer roller 16.

4a to 4e show that the detent 1a is being formed while the outer straw 1 separated from the straw material 1' is held in the groove 3 on the outer peripheral surface of the drum 5 for conveying and processing the outer straw. It is a sectional view of the main part showing progress when it is performed. That is, as shown in FIG. 4a, the outer straw 1 after being divided from the two outer straw materials is moved in the outward direction of the circumference by the circumferential guide 24 along the outer peripheral surface of the conveying processing drum 5. is regulated, and the rear end of the outer straw 1 is pushed and guided by the side guidance guide 26, so that the diameter-reducing side end edge 1b moves to its predetermined movement line t, and after moving, it moves to the position shown in FIG. 4b. As shown, the suction box 25 allows the suction box 25 to pass through the air intake hole 18 into the concave groove 3.
The molded detent rod 8 is then pushed into the outer straw 1 by the push guide 9 as shown in FIG. The straw diameter reduction side edge positioning part 7 enters and is placed in a predetermined position relative to the flange 11 of the detent forming roller 12, that is, the circumferential groove 6 of the mandrel part 8a of the detent forming rod 8 is in the same relationship as the flange 11. After the outer straw 1 is pushed in until it reaches the position, as shown in FIG. are the opposing projecting edges 11, 11
The detent 1a is formed by recessing the outer wall portion of the detent 1a and the circumferential groove 6 of the mandrel portion 8a. At this time, since the circumferential groove 6 of the mandrel part 8a of the detent molding rod and the outer straw diameter reduction side edge positioning part 7 are integrally formed, the end edge thereof abuts against the positioning part 7. The detent 1a can always be accurately formed in the applied outer straw 1 at a predetermined position from the diameter-reducing side end edge with accurate dimensions. Next, as shown in FIG. 4e, the outer straw 1 that has been formed is placed on the outside by a straw pressing roller 2 made of sponge.
9, the push-in guide 9 releases the push-in (the figure shows the push-in guide 9 in the middle of releasing the push-in), and the mandrel part 8a is inserted into the outer straw 1.
be extracted from.

FIG. 6 is a diagram showing an example of the flow of straws showing the relationship between the detent forming process and the manufacturing process of double straws, and shows the case where the manufacturing line is arranged in two rows in an arbitrary double straw manufacturing device. .

The two outer straw materials 1' are divided into two equal parts by a cutter, and the divided outer straws 1 are guided and conveyed to the outside (downward in the figure) of the conveyance line, and are cut into circumferential grooves 6 during the conveyance. The detent forming rod 8 integrally formed with the outer straw diameter reducing side edge positioning portion 7 is pushed in, and the reducing diameter side end edge 1b of the outer straw is placed on the outer straw reducing side of the detent forming rod 8. A pair of detent forming rollers 1 facing each other with their positions regulated by the edge positioning section 7
After the detent 1a is formed by the mandrel part 8a and the ridges 11, 11 of the forming roller 12, the mandrel part 8 of the detent forming rod 8
a is pulled out from the outer straw 1. Next, when the outer straw 1 (with a detent) is conveyed obliquely on a screw conveyor or the like and then straightly conveyed on a bucket conveyor or the like, two inner straw materials 2'
The inner straw 2 (both ends of which have been obliquely cut) is divided into two equal parts by a cutter, and the divided inner straw 2 is conveyed obliquely by a screw conveyor, etc., and the outer straw 1 is conveyed in the straight direction, and an arbitrary inner and outer straw insertion means is provided. Then, the inner straw 2 is inserted into the outer straw 1. The inner and outer straws that have been inserted for a predetermined length and are in a combined state are placed in the outer straw forming mold 5 during their transportation.
1. Outer straw 1 is formed by inner straw mold 52.
The engaging side end of the inner straw is reduced in diameter, and the engaging side end of the inner straw is expanded in diameter. After that, push the inner straw 2 into the outer straw 1 with a guide, etc., pull out the inner straw 2 with a pinch roller, etc., and use any means to push the inner straw 2 into the outer straw 1.
The rear end is slightly reduced in diameter and the inner straw 2 is housed inside the outer straw 1 to complete the double straw with detent. In this case, the apparatus of the present invention can be used by accurately fabricating the engagement side reduced diameter part of the outer straw and the engagement side enlarged diameter part of the inner straw based on the outer side, which is the processing side end of both the inner and outer straws. If the detent of the double straw is made with high precision by recessing the outer wall of the outer straw, it is possible to manufacture a double straw with good locking condition when extended.

Fig. 7 is a side view of the double straw produced using the detent forming device of the present invention in an extended state, and Fig. 8 is a sectional view of the double straw in its shortened state. By making this, the double straw can be properly locked in the extended state as shown in FIG.

In this example, the explanation was given for a production line with two rows, but it can also be applied to a production line with one row.
It is also possible to create only the detent forming device alone and supply the completed outer straw with detent to the outer straw hopper of the double straw manufacturing line.

In addition, in the embodiment, the detent forming processing section was installed facing the drum that cuts and conveys the outer straw connected to the outer straw material supply device (not shown), but this is not a limitation, and the detent forming processing section is installed in front of the drum that cuts and conveys the outer straw, which is connected to the outer straw material supply device (not shown). It is possible to install it on any of the outer straw conveyor drums.

In the above embodiment, when providing a protrusion on the inner surface of the outer straw that allows the enlarged diameter portion of the inner straw to ride over as a detent for the double straw, a circumferential groove is formed on the outer periphery of the outer straw to prevent the inside of the outer straw from returning. The inner straw detent consisting of a continuous protrusion was formed on the wall surface, but instead of this,
The protruding edge of the detent forming roller may not be continuous, but may be provided partially in the circumferential direction to partially form one or more detents on the inner wall surface of the outer straw.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the outer straw of the double straw is continuously conveyed so that the respective ends of the inner and outer straws on the overlapping side are engaged in the extended state. In addition, in order to process with high precision, a forming rod is used in which a forming groove and an outer straw diameter reduction side edge positioning part are integrally formed at the end of the outer straw received in the concave groove of the outer straw conveying processing drum. Then, the detent protrusion of the double straw is protruded from the inner wall of the outer straw at a more accurate position than the edge of the reduced diameter side of the outer straw, and a highly accurate detent is formed efficiently and continuously. By installing this device at an appropriate position between the outer straw supply part of the double straw manufacturing device and the diameter reduction processing part of the outer straw engagement side end, or by using this device alone. By using an external straw with a detent manufactured by the above method in a double straw production line, a double straw with a detent of good quality and excellent usability that does not rattle or leak air when the straw is extended is manufactured. be able to.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the main parts of the detent forming apparatus of the present invention, and shows a cross section taken along the line - in FIG. 2. Fig. 2 is a side view showing a drum for conveying and processing outer straws equipped with a detent forming device, Fig. 3 is a side view showing the main parts of the detent rolling section, and Figs. 4a to 4e. Figure 4a is a cross-sectional view of the main part showing the process of forming a detent while the outer straw is held in the groove on the outer peripheral surface of the conveyance processing drum. Fig. 4b is a diagram showing the state when the outer straw is guided by vacuum suction at a predetermined position, Fig. 4c
FIG. 4d is a diagram when the core part of the forming rod is inserted into the outer straw, and FIG.
Fig. 4e is a view when the mandrel is pulled out from the outer straw after the forming process, Fig. 5 is a partially enlarged view of the head of the forming rod, and Fig. 6 is a view showing the two parts after the detent forming process. 7 is a side view showing the extended state of the double straw manufactured using the detent forming device of the present invention; FIG. FIG. 3 is a cross-sectional view showing the straw in a shortened state. 1... Outer straw, 1a... Detent, 1b...
...Outer straw diameter reducing side edge, 3... Concave groove, 5...
Outer straw conveyance processing drum, 6...Circumferential groove, 7...Outer straw diameter reduction side edge positioning part, 8
...Detent molding rod, 8a... Core metal part, 9...
... Pushing guide, 10 ... Base frame, 11 ... Projection, 12 ... Detent forming roller, t ... Movement line of the diameter-reducing side edge of the outer straw.

Claims (1)

[Scope of Claims] 1. Consisting of an outer straw and an inner straw that is inserted into and out of the outer straw, the outer straw is engaged so that the overlapping ends of the inner and outer straws are engaged when the inner and outer straws are extended. A large number of grooves 3 for receiving outer straws 1 are provided on the outer periphery for producing a double straw in which the engaging side end is reduced in diameter and the engaging side end of the inner straw is expanded in diameter, and the outer straw is conveyed. A detent forming rod 8 is provided in which a single circumferential groove 6 and an outer straw diameter-reducing side edge positioning portion 7 are integrally formed on the outer straw transport processing drum 5 for detent forming. The grooves 3 face each side of each groove 3 of the conveyance processing drum 5 and can move forward and backward freely.
In addition, the push guide 9 of the detent molding rod 8 is provided on the base frame 10 side, and the circumferential groove 6 of the molding rod 8 is pressed from both sides at a predetermined position. A pair of non-retentive forming rollers 12, 12 each having a protruding edge 11 on the outer periphery are pivotally supported on the base frame 10, and the concave groove 3 is
beyond the movement line t of the end edge of the reduced diameter side of the outer straw 1 received and transferred to the detent forming rod 8
Move the detent forming rod 8 straight so that the outer straw diameter reduction side edge positioning part 7 of the
With the outer straw 1 placed over the core metal part 8a of the forming rod 8 and the position of the outer straw diameter-reduced end edge 1b of the outer straw 1 corrected by the edge positioning part 7, the pair of detent forming rollers 12 , 12 and the core part 8a of the detent molding rod, the outer wall of the outer straw 1 is pressed and rolled to form a detent 1a when the straw is extended. Stop forming device. 2 The outer circumferential speed of the outer peripheral device of the outer straw 1 placed over the mandrel 8a of the detent forming rod and the flange 11 of the detent forming roller 12 are made approximately equal, and the outer peripheral speed of the flange 11 is set to the above-mentioned level. The double straw detent forming apparatus according to claim 1, characterized in that the speed of movement on the circumference of the concave groove 3 on the outer periphery of the drum 5 for conveying and processing the outer straw is made greater than that on the circumference.