JP2002307578A - Paper lid press-molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press-molding device capable of forming a large protrusion on a paper lid. SOLUTION: A cavity ring 67 is made to descend as indicated by an arrow in Fig. (a) and thus the edge of a paper blank 65 can be folded downward. In Fig. (b), a pin 40 is pushed out by lowering an ascending/descending cam ring 52 as shown by the arrow and a protrusion 16 is formed. Consequently, the protrusion 16 of a desired shape can be formed on the paper lid by collectively moving the pin 40 forward and backward when a movable half of a mold is at a lower dead-spot position. Since the depth of the protrusion 16 can be decided by a stroke of the pin 40, the protrusion 16 can be freely formed without being concerned about the paper quality of the paper blank 65.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an apparatus for press-forming a paper lid.

[0002]

2. Description of the Related Art Some beverage stores put coffee or juice in a paper cup and offer the product to consumers with the top opening of the cup closed with a plastic lid.
After drinking coffee or juice, garbage must be separated from paper products (cups) and plastics (lids). If not separated, everything will be treated as plastic and the waste disposal costs will be overcharged. However, it is not possible to force the consumers to separate, and the store employees must perform the re-sorting work including the inspection, which increases labor costs.

Accordingly, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 8-156.
No. 955, “Paper Lid, Production Method and Production Apparatus”
Proposed a paper lid and its manufacturing technology. This paper lid is
It is manufactured by a method shown in FIGS. That is, in FIG. 3B, the concave portion 33 is provided in the male mold 30 and the female mold 20 is lowered as indicated by a white arrow. Then, as shown in (c), a convex portion 2e can be formed, and this convex portion 2e serves as a retaining piece of the lid for the cup.

[0004]

However, the convex portion 2e
In order to collect and swell the paper blanks, there is a limit on the projection allowance, and advanced manufacturing techniques such as pre-wetting the paper blanks are required, which hinders practical application and cost reduction. Accordingly, an object of the present invention is to provide an apparatus capable of easily press-forming a paper lid having a projection having a large projection margin.

[0005]

In order to achieve the above object, a first aspect of the present invention is a female mold having an annular groove, a male mold having a peripheral wall entering the annular groove, and a plurality of male molds provided on the outer wall surface of the peripheral wall. And a plurality of pins attached to the female mold along the radiation emitted from the center of the female mold to move toward and away from each of these concave parts, and collectively collect the pins when the movable mold is at the bottom dead center position. And a pin advancing / retracting means for advancing / retreating the paper cover.

A paper cover is manufactured by molding a paper blank into a male mold and a female mold. At this time, a projection is formed on the paper cover with a plurality of pins. The projections play a role in which the paper lid fits into the paper cup and does not come off easily. This is an apparatus that can form such important projections reliably and easily.

According to a second aspect of the present invention, the female mold is a split mold comprising a female mold body including a central projection for forming a central depression of the paper lid and a female ring for bending the edge of the paper lid. I do.

By dividing the female die into a female die body and a female ring, so-called two-stage press forming can be performed, and the paper blank can be formed easily and reliably.

According to a third aspect of the present invention, the pin advancing / retracting means includes a cam surface for pushing the buttocks of a pin protruding from the outer peripheral surface of the female or female ring, and a female shaft on the outer peripheral surface of the female or female ring. And a cam ring moving cylinder for moving the elevating cam ring.

[0010] A plurality of pins can be moved forward and backward collectively by the elevating cam ring. Since the pin advance / retreat means is composed of an elevating cam ring and a cam ring moving cylinder,
Since the configuration is simple and the number of parts is small, it is easy to reduce the manufacturing cost and to make the device compact.

According to a fourth aspect of the present invention, the pin advancing / retracting means includes a cam surface for pushing the buttocks of a pin protruding from the outer peripheral surface of the female or female ring and a male shaft on the outer peripheral surface of the female or female ring. The rotating cam ring is rotatably fitted around the cam ring, and the cam ring moving cylinder moves the rotating cam ring.

In addition to the functions and effects of claim 3, claim 4
Only rotates the rotary cam ring, the guide and holding of the rotary cam ring are simplified, and the rotary cam ring can be rotated by one cam ring moving cylinder, so that the configuration is further simplified.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a plan view of a paper lid manufactured by a press molding apparatus according to the present invention, and FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1. A paper lid 10 has a large central depression 11 and an edge of the depression 11. A ring-shaped inner piece 12 that has been raised, a ring-shaped flange 13 that protrudes horizontally from the upper end of the inner piece 12, a ring-shaped outer piece 14 that has been lowered from the outer edge of the flange 13, and an outer piece 14 is a press-formed product made of paper, comprising eight projections 16 formed on 14 (... denotes a plurality; the same applies hereinafter), and the upper edge of a paper cup is fitted in the groove 15. Later, the projections 16 are used to prevent detachment. A press forming apparatus for forming the paper lid 10 having this structure will be described below.

FIG. 3 is a diagram showing the principle of the paper cover press forming apparatus according to the present invention. The paper cover press forming apparatus 20 comprises an annular groove 21, a central projection 22 at the center of the annular groove 21 and an outer groove. Female mold 24 having outer ring projections 23, and annular groove 21
, A male mold 30 having a peripheral wall 31 and a depression 32 surrounded by the peripheral wall 31, a plurality of concave portions 34 provided on an outer wall surface 33 of the peripheral wall 31,
And a plurality of pins 40... Attached to the female mold 24 to move toward and away from each other, and collectively move the pins 40... After the movable female mold 24 reaches the bottom dead center position. And a movable type moving cylinder 60 for raising and lowering the movable female die 24. Reference numeral 61 denotes an elevator board of the press machine, and 62 denotes a mold receiving board of the press machine.

The pin advance / retreat means 50 is provided on the outer peripheral surface 2 of the female mold 24.
An elevating cam ring 52 having a cam surface 51 for pushing the buttocks 41 of the pins protruding from the female member 5 and being fitted to the outer peripheral surface 25 of the female die 24 along the female shaft 26 so as to be movable up and down in the figure. It comprises cam ring moving cylinders 53, 53 for moving the elevating cam ring 52, and brackets 54, 54 for connecting the cam ring moving cylinders 53, 53 to the female mold 24.

FIG. 4 is a sectional view taken along line 4-4 of FIG.
(8 pieces at equal pitch in the figure), each of which has a pin body 42, a small-diameter pin tip 43, a rounded pin butt 41, a long hole 44 formed in the pin body 42, and a stopper. It comprises a pin 45 and a return spring 46. In the figure, the pin 40
Indicates that the buttocks 41 of the pins are protruding from the outer peripheral surface 25, and that the stopper pins 45 are hooked on one ends of the elongated holes 44 as if the pins 40 were disengaged by the action of the return spring 46. . The vertical cam ring 52 is shown by a large imaginary line circle, and indicates that one vertical cam ring 52 corresponds to eight pins 40.

The operation of the paper lid press forming apparatus having the above configuration will be described below. Returning to FIG. 3, the female mold 24, which is a movable mold in the figure, is at the top dead center. At this time, the paper blank 65 is placed on the male mold 30. Next, the movable movable cylinder 60
Is operated to lower the female mold 24. Then, the central protrusion 22 enters the depression 32 while squeezing the paper blank 65, and at the same time, the peripheral wall 31 enters the annular groove 21.

FIGS. 5 (a) and 5 (b) are views for explaining the operation of the paper lid press forming apparatus. (A) is a female type 24 which is a movable type.
Indicates that the paper blank 65 has reached the bottom dead center, indicating that the paper blank 65 has been bent into a substantially desired shape. From this state, the cam ring moving cylinder 53 is operated to lower the elevating cam ring 52. The cam surface 51 is an obliquely cut surface, and functions to convert a descending operation into a horizontal pushing operation.

FIG. 4B shows that the protrusion 16 has been formed on the paper blank 65 as a result of the pin tip 43 being pushed into the recess 34 (see FIG. 4A) by the action of the lifting cam ring 52.

In summary, in FIG. 3, the two right and left cam ring moving cylinders 53, 53 are operated to lower the elevating cam ring 52, and the eight pins 40 shown in FIG.
Can be advanced simultaneously in a lump. Therefore, a plurality of protrusions can be formed instantaneously. In addition, the depth of the projection provided on the paper lid can be easily increased only by increasing the depth of the recesses 34 in FIG. 3 and increasing the stroke of the pin 40.

Next, another embodiment of the present invention will be described. FIG. 6 is a principle diagram of another embodiment of a paper lid press forming apparatus according to the present invention, wherein the female die 24 is divided into a female die body 66 and a female die ring 67. That is, the paper lid press forming apparatus 20 has an annular groove 21, a central central projection 22 bordering the annular groove 21, and an outer ring projection 23, and a central projection for forming a central depression of the paper lid. And a male mold 30 having a peripheral wall 31 entering the annular groove 21 and a depression 32 surrounded by the peripheral wall 31.
And a plurality of recesses 34 provided on the outer wall surface 33 of the peripheral wall 31.
And a plurality of pins 40 provided on the female ring 67 to advance and retreat toward each of these recesses 34.
And pin moving means 5 for moving the pins 40... Collectively forward and backward after the movable female ring 67 reaches the bottom dead center position.
0, a movable movable cylinder 60 for raising and lowering a movable female main body 66, and movable movable sub-cylinders 68 for raising and lowering a female ring 67.

Since the pin 40 and the pin moving means 50 are the same as those described with reference to FIGS. 1 and 2, the reference numerals are used and the description is omitted.

Referring to FIG. 6, the operation of another embodiment will be described. The female body 66 and the female ring 67 are at the top dead center.
At this time, the paper blank 65 is placed on the male mold 30. next,
The movable movable cylinder 60 and the sub-cylinder 68 are operated to lower the female main body 66 and the female ring 67 halfway.

FIGS. 7A and 7B are explanatory views (part 1) of the operation of a paper lid press forming apparatus according to another embodiment. (A), a female blank 66 and a female ring 67 are both paper blanks 65.
The lowering of the female ring 67 is stopped at this time, and only the female main body 66 is continuously lowered.
(B) shows that the central female body 66 has reached the bottom dead center and a large depression has been formed in the center of the paper blank 65,
In this molding process, the female ring 67 serves as a blank holder for lightly holding the edge of the paper blank 65.

FIGS. 8A and 8B are explanatory views (part 2) of the operation of a paper lid press forming apparatus according to another embodiment. In (a), the female ring 67 is lowered as shown by the arrow. Thus, the edge of the paper blank 65 can be bent downward. In (b), the lifting cam ring 52 is lowered as shown by the arrow, and the pin 40 is pushed out to form the projection 16.

FIG. 7B shows another embodiment of the present invention.
5 is characterized in that a central depression is formed, and then, as shown in FIG. More specifically, in FIG. 7B, the edge of the paper blank 65 is pulled to the center, so that the paper blank 65 moves while sliding under the female ring 67. Since FIG. 8A is performed after the lateral movement is completed, it can be said that the molding is mild to the paper blank 65, and there is little fear that the paper blank 65 is torn or the paper blank 65 is wrinkled. Become.

FIG. 9 is a view showing another embodiment of the pin advance / retreat means according to the present invention. The pin advance / retreat means 50 is provided with pins 41 projecting from the outer peripheral surface 25 of the female or female ring.
And a cam ring 56 which is rotatably fitted around the male axis on the outer peripheral surface 25 of the female or female ring, and a cam ring moving cylinder for rotating the rotary cam ring 56. 53,
Consists of

FIGS. 10A and 10B are explanatory diagrams of the operation of FIG. 9. Since the configuration of the pin 40 is the same as that of FIG. 4, the reference numerals will be used and the description will be omitted. FIG. 10A is an enlarged view of the portion 10a in FIG. 9 and shows that the pin 40 is at the retracted position. From this state, the cam ring moving cylinder 53 is operated to rotate the rotary cam ring 56 as shown by the arrow. (B) shows that the projection 40 has been formed by advancing the pin 40 by the pushing action of the cam surface 51. If the rotary cam ring 56 is rotated in the reverse direction, it returns to (a) and the pin 40 can be retracted.

The rotating cam ring 56 can be rotated by one cam ring moving cylinder 53. That is,
By providing a receiver for guiding the upper and lower surfaces on the outer peripheral surface 25, the rotary cam ring 56 can be smoothly rotated without moving up and down.

The pin advance / retreat means 50 is connected to one pin 40.
May be provided with one actuator. The actuator here refers to a broadly defined drive component such as an air cylinder, a hydraulic cylinder, and a solenoid.

In the embodiment, the male mold is the lower mold and the female mold is the upper mold. However, the male mold may be reversed and the male mold may be the upper mold and the female mold may be the lower mold. Further, in the embodiment, the movable flow line is vertical, but it may be horizontal or oblique.

[0032]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, when the movable mold is at the bottom dead center position, the pins are moved forward and backward collectively, so that a desired projection can be formed on the paper lid. Since the depth of the protrusion can be determined by the stroke of the pin, the protrusion can be formed freely without concern for the paper quality of the paper blank.

According to the second aspect, by dividing the female mold into the female mold body and the female mold ring, so-called two-stage press molding can be performed, and the paper blank can be easily and reliably molded.

According to a third aspect of the present invention, the pin advancing / retreating means includes a cam surface for pushing the buttocks of the pins protruding from the outer peripheral surface of the female or female ring, and a female shaft on the outer peripheral surface of the female or female ring. And a cam ring moving cylinder for moving the elevating cam ring. A plurality of pins can be moved forward and backward by the elevating cam ring. Since the pin advancing / retracting means is composed of the elevating cam ring and the cam ring moving cylinder, the configuration is simple and the number of parts is small.
It is easy to reduce the manufacturing cost and make the device compact.

According to a fourth aspect of the present invention, the pin advancing / retracting means includes a cam surface for pushing the buttocks of the pins protruding from the outer peripheral surface of the female or female ring, and a male shaft on the outer peripheral surface of the female or female ring. A rotary cam ring fitted around the rotary cam ring so as to be rotatable, and a cam ring moving cylinder for moving the rotary cam ring. In addition to the functions and effects of claim 3, claim 4 merely rotates the rotary cam ring. Therefore, the guide and holding of the rotary cam ring are simplified, and the rotary cam ring can be rotated by one cam ring moving cylinder, so that the configuration is further simplified.

[Brief description of the drawings]

FIG. 1 is a plan view of a paper lid manufactured by a press molding apparatus according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a diagram showing the principle of a paper lid press forming apparatus according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is an explanatory view of the operation of the paper lid press forming apparatus.

FIG. 6 is a principle view of another embodiment of the paper lid press forming apparatus according to the present invention.

FIG. 7 is a view for explaining the operation of a paper lid press forming apparatus according to another embodiment (part 1).

FIG. 8 is a view for explaining the operation of the paper lid press forming apparatus of another embodiment (part 2).

FIG. 9 is a view showing another embodiment of the pin moving means according to the present invention;

FIG. 10 is an operation explanatory view of FIG. 9;

[Explanation of symbols]

10: paper lid, 11: depression at the center of the paper lid, 16: projection, 2
0: paper lid press forming device, 21: annular groove, 22:
Central protrusion, 24: female type, 25: female or outer peripheral surface of female ring, 26: female type shaft, 27: female type center, 28 ...
Radiation, 30: male, 31: peripheral wall, 33: outer wall surface of peripheral wall, 34: recess, 40: pin, 41: butt of pin, 43:
Pin tip, 50: Pin advance / retreat means, 51: Cam surface, 52 ...
Elevating cam ring, 53 ... Cam ring moving cylinder, 56
... Rotating cam ring, 65 ... Paper blank, 66 ... Female body, 67 ... Female ring.

 ──────────────────────────────────────────────────続 き Continued from the front page F term (reference) 3E075 AA15 AA28 BA30 BB22 CA01 DC18 DC28 DC46 GA03

Claims (4)

[Claims] 1. A female mold having an annular groove, a male mold having a peripheral wall entering the annular groove, a plurality of recesses provided on an outer wall surface of the peripheral wall, and advancing / retreating toward each of these recesses. Paper comprising: a plurality of pins attached to the female mold along radiation emitted from the center of the female mold; and pin advancing / retracting means for collectively advancing and retreating the pins when the movable mold is at the bottom dead center position. Lid press forming equipment. 2. The female mold according to claim 1, wherein said female mold is a split mold comprising a female mold body including a central projection for forming a central recess of a paper lid, and a female ring for bending an edge of the paper lid. Item 2. A paper lid press molding apparatus according to Item 1. 3. The pin advance / retreat means includes a cam surface for pushing the buttocks of pins protruding from the outer peripheral surface of the female or female ring, and the female or female ring has an outer peripheral surface extending along the female axis. Lifting cam ring fitted movably,
3. A cam ring moving cylinder for moving the lifting cam ring.
Press forming apparatus for the paper lid according to the above. 4. The pin advance / retreat means includes a cam surface for pushing in the buttocks of a pin protruding from the outer peripheral surface of the female or female ring, and the male or female ring is provided on the outer peripheral surface of the female or female ring around the male axis. 3. The paper cover press forming apparatus according to claim 1, comprising a rotatable cam ring rotatably fitted thereto, and a cam ring moving cylinder for moving the rotatable cam ring.