JP4563610B2 - Paper lid press molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a press forming apparatus for a paper lid.
[0002]
[Prior art]
Some beverage stores provide coffee to consumers with coffee or juice in a paper cup, with the top opening of the cup covered with a plastic lid. After drinking coffee or juice, garbage needs to separate paper products (cups) and plastics (lids). If it is not sorted, everything will be treated as plastic and waste disposal costs will be overcharged. However, it does not force the consumers to separate, and the store side employees must carry out re-sorting work including inspection, which increases labor costs.
[0003]
Therefore, the present applicant has previously proposed a paper lid and a manufacturing technique thereof in Japanese Patent Laid-Open No. Hei 8-156955 “Paper lid, manufacturing method and manufacturing apparatus thereof”. This paper lid is manufactured by the method shown in FIGS. 3B and 3C of the publication. That is, in FIG.3 (b), the recessed part 33 is provided in the male type | mold 30, and the female type | mold 20 is lowered | hung like a white arrow. Then, the convex part 2e can be formed as shown in (c), and this convex part 2e becomes a retaining piece of the lid with respect to the cup.
[0004]
[Problems to be solved by the invention]
However, since the convex part 2e gathers and swells the paper blank, there is a limit to the projection margin, and advanced manufacturing technology such as pre-wetting the paper blank is required, which hinders practical use and cost reduction. Yes.
Accordingly, an object of the present invention is to provide an apparatus capable of easily press-molding a paper lid having a protrusion with a large protrusion margin.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a female mold having an annular groove, a male mold having a peripheral wall entering the annular groove, a plurality of recesses provided on the outer wall surface of the peripheral wall, and each of these recesses. A plurality of pins attached to the female mold along the radiation emitted from the center of the female mold to advance and retract toward the center, and a pin advance / retreat means for collectively advancing and retracting the pins when the movable mold is at the bottom dead center position, To form a press forming apparatus for the paper lid.
[0006]
A paper blank is manufactured by molding a paper blank with a male mold and a female mold, and at this time, a plurality of pins are used to form protrusions on the paper lid. The protrusions fit the paper cup into the paper cup and play a role that does not come off easily. This is an apparatus capable of reliably and easily forming such an important protrusion.
[0007]
According to a second aspect of the present invention, the female mold is a split mold including a female mold main 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.
[0008]
By dividing the female die into the female die main body and the female die ring, so-called two-stage press molding can be performed, and a paper blank can be easily and reliably molded.
[0009]
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 die or the female ring, and along the female die shaft on the outer peripheral surface of the female die or the female die ring. It is characterized by comprising an elevating cam ring that is movably fitted, and a cam ring moving cylinder that moves the elevating cam ring.
[0010]
A plurality of pins can be advanced and retracted collectively by the lifting cam ring. Since the pin advancing / retreating unit is composed of the raising / lowering cam ring and the cam ring moving cylinder, the configuration is simple and the number of parts is small, so that the manufacturing cost can be reduced and the size can be easily reduced.
[0011]
According to a fourth aspect of the present invention, the pin advancing / retreating means has a cam surface for pushing the bottom of the pin protruding from the outer peripheral surface of the female mold or female ring, and rotates around the male axis on the outer peripheral surface of the female mold or female ring. It is characterized by comprising a rotating cam ring that can be fitted and a cam ring moving cylinder that moves the rotating cam ring.
[0012]
In addition to the actions and effects of claim 3, claim 4 simply rotates the rotating cam ring, so that the rotating cam ring can be easily guided and held and can be rotated by a single cam ring moving cylinder. Becomes even simpler.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a plan view of a paper cover manufactured by a press molding apparatus according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and the paper cover 10 is formed from a large dent 11 at the center and an edge of the dent 11. A ring-shaped inner piece 12 that is raised, a ring-shaped flange 13 that extends horizontally from the upper end of the inner piece 12, a ring-shaped outer piece 14 that is lowered from the outer edge of the flange 13, and the outer piece. 14 is a paper press-molded product formed of eight protrusions 16 formed on 14 (... indicates a plurality, the same applies hereinafter), and the upper edge of the paper cup is fitted into the groove 15 Later, the projections 16... Prevent the disengagement. A press molding apparatus for molding the paper lid 10 having this structure will be described below.
[0014]
FIG. 3 is a principle diagram of a press forming apparatus for a paper lid according to the present invention. The press forming apparatus 20 for a paper cover includes an annular groove 21, a central central protrusion 22 and an outer outer ring protrusion with the annular groove 21 as a boundary. 23, a male mold 30 having a peripheral wall 31 entering the annular groove 21 and a recessed portion 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 attached to the female mold 24 to advance and retract toward each of the recesses 34... And the movable female mold 24 has reached the bottom dead center position. It comprises a pin advancing / retreating means 50 for advancing and retreating the pins 40... And a movable moving cylinder 60 for moving the movable female die 24 up and down.
Reference numeral 61 denotes a lifting machine for the press machine, and 62 denotes a mold receiving board for the press machine.
[0015]
The pin advancing / retracting means 50 includes a cam surface 51 for pushing the pin bottom 41 projected from the outer peripheral surface 25 of the female die 24 and is movable along the female shaft 26 to the outer peripheral surface 25 of the female die 24 (in the drawing). And a cam ring moving cylinders 53 and 53 for moving the elevating cam ring 52, and brackets 54 and 54 for connecting the cam ring moving cylinders 53 and 53 to the female mold 24.
[0016]
4 is a cross-sectional view taken along line 4-4 of FIG. 3, and a plurality of pins 40 (eight at the same pitch in the figure) are provided along the radiation 28 ... emitted from the center 27 of the female mold 24. FIG. Each includes a pin body 42, a small-diameter pin tip 43, a rounded pin butt 41, a long hole 44 opened in the pin body 42, a stopper pin 45, and a return spring 46. In the drawing, the pin 40 is retracted, the pin bottom 41 protrudes from the outer peripheral surface 25, the stopper pin 45 is hooked on one end of the long hole 44 so that the pin 40 is detached by the action of the return spring 46. Indicates that Since it is shown by a large imaginary line circle, it is an elevating cam ring 52, indicating that one elevating cam ring 52 is associated with eight pins 40.
[0017]
Next, the operation of the press forming apparatus for the paper lid having the above configuration will be described.
Returning to FIG. 3, the movable mold 24 in the drawing is at the top dead center, and the paper blank 65 is placed on the male mold 30 at this time. Next, the movable moving cylinder 60 is operated to lower the female mold 24. Then, the central projection 22 enters the recessed portion 32 while squeezing the paper blank 65, and at the same time, the peripheral wall 31 enters the annular groove 21.
[0018]
5 (a) and 5 (b) are explanatory views of the operation of the press forming apparatus for paper lids.
(A) shows that the female die 24 which is a movable type has reached bottom dead center, and 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 the descending operation into a horizontal extrusion operation.
[0019]
(B) shows that the projection 16 was formed on the paper blank 65 as a result of the pin tip 43 being pushed into the recess 34 (see (a)) by the action of the elevating cam ring 52.
[0020]
In summary, in FIG. 3, the left and right cam ring moving cylinders 53, 53 are operated to lower the elevating cam ring 52, and the eight pins 40 shown in FIG. Therefore, a plurality of protrusions can be formed instantaneously. In addition, it is possible to easily increase the depth of the protrusion provided on the paper lid simply by deepening the recesses 34 in FIG. 3 and increasing the stroke of the pin 40.
[0021]
Next, another embodiment of the present invention will be described.
FIG. 6 is a diagram showing the principle of another embodiment of the paper lid press-forming apparatus according to the present invention. The female die 24 is divided into a female die main body 66 and a female die 67. In other words, the press forming apparatus 20 for the paper lid has an annular groove 21, a central central protrusion 22 and an outer outer ring protrusion 23 with the annular groove 21 as a boundary, and a central protrusion for forming a central recess of the paper lid. Including a female mold body 66 and a female mold 24 having a female ring 67 that bends the edge of the paper cover, a peripheral wall 31 that enters the annular groove 21, and a male mold 30 that has a depressed portion 32 surrounded by the peripheral wall 31; 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 so as to advance and retract toward each of the recesses 34. A pin advancing / retreating means 50 for advancing and retracting the pins 40 collectively after the movable female ring 67 reaches the bottom dead center position, and a movable moving cylinder 60 for moving the movable female main body 66 up and down. , Raise and lower the female ring 67 A movable mold moving sub cylinder 68 Prefecture.
[0022]
Since the pin 40 and the pin advance / retreat means 50 are the same as those described with reference to FIGS. 1 and 2, the reference numerals are used and the description thereof is omitted.
[0023]
The operation of another embodiment will be described with reference to FIG. 6. The female main body 66 and the female ring 67 are at top dead center. At this time, the paper blank 65 is placed on the male mold 30. Next, the movable moving cylinder 60 and the sub cylinder 68 are operated to lower the female main body 66 and the female ring 67 halfway.
[0024]
FIGS. 7A and 7B are operation explanatory views (No. 1) of a press forming apparatus for a paper lid according to another embodiment.
(A) shows the case where the female main body 66 and the female ring 67 are both in contact with the paper blank 65. At this time, the lowering of the female ring 67 is stopped 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 moves the edge of the paper blank 65. It plays the role of a blank holder that holds lightly.
[0025]
FIGS. 8A and 8B are operation explanatory views (No. 2) of the press forming apparatus for paper lids of 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 raising / lowering cam ring 52 is lowered as shown by the arrow to push the pin 40 and form the protrusion 16.
[0026]
In this alternative embodiment, the central depression was formed in the paper blank 65 in FIG. 7 (b), and then the edge of the paper blank 65 was bent in FIG. 8 (a). It is characterized by. Specifically, in FIG. 7B, since the edge of the paper blank 65 is pulled to the center, it 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 paper blank 65 is mildly formed, and there is little fear that the paper blank 65 is torn or the paper blank 65 is wrinkled. Become.
[0027]
FIG. 9 is a diagram showing another embodiment of the pin advancing / retreating means according to the present invention. The pin advancing / retreating means 50 is a cam surface that pushes in the butt 41... Of the pin projected from the outer peripheral surface 25 of the female mold or female ring. , And a cam ring moving cylinder 53 for rotating the rotary cam ring 56. The rotary cam ring 56 is rotatably fitted around the male axis on the outer peripheral surface 25 of the female die or the female die ring. .
[0028]
FIGS. 10A and 10B are explanatory diagrams of the operation of FIG. 9 and the configuration of the pin 40 is the same as that of FIG.
(A) is the 10a part enlarged view of FIG. 9, and shows that the pin 40 exists in a retracted position. From this state, the cam ring moving cylinder 53 is operated to rotate the rotating cam ring 56 as indicated by the arrow.
(B) shows that the projections 16 can be formed by advancing the pin 40 by the pushing action of the cam surface 51. If the rotating cam ring 56 is rotated in the reverse direction, the return pin 40 can be moved back to (a).
[0029]
The rotating cam ring 56 can be rotated by one cam ring moving cylinder 53. That is, if the outer peripheral surface 25 is provided with a guide for guiding the upper and lower surfaces, the rotating cam ring 56 can be smoothly rotated without moving up and down.
[0030]
Further, the pin advance / retreat means 50 may be one in which one actuator is provided for one pin 40. The actuator here refers to a drive component in a broad sense such as an air cylinder, a hydraulic cylinder, or a solenoid.
[0031]
In the embodiment, the male mold is the lower mold and the female mold is the upper mold. However, these may be reversed to change the male mold to the upper mold and the female mold to the lower mold. In the embodiment, the movable flow line is vertical, but it may be horizontal or oblique.
[0032]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect, when the movable die is at the bottom dead center position, desired projections can be formed on the paper cover by collectively moving the pins back and forth. Since the depth of the protrusion can be determined by the stroke of the pin, the protrusion can be freely formed without worrying about the paper quality of the paper blank.
[0033]
In claim 2, by dividing the female die into the female main body and the female ring, so-called two-stage press molding can be performed, and the paper blank can be easily and reliably formed.
[0034]
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 die or the female ring, and along the female die shaft on the outer peripheral surface of the female die or the female die ring. The elevating cam ring is movably fitted 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 / retreating unit is composed of the raising / lowering cam ring and the cam ring moving cylinder, the configuration is simple and the number of parts is small, so that the manufacturing cost can be reduced and the size can be easily reduced.
[0035]
According to a fourth aspect of the present invention, the pin advancing / retreating means has a cam surface for pushing the bottom of the pin protruding from the outer peripheral surface of the female mold or female ring, and rotates around the male axis on the outer peripheral surface of the female mold or female ring. In addition to the operation and effect of claim 3, in addition to the operation and effect of claim 3, claim 4 only rotates the rotary cam ring. Since the rotating cam ring can be easily guided and held and can be rotated by one cam ring moving cylinder, 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 cross-sectional view taken along line 2-2 of FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3. FIG. 5 is a diagram for explaining the operation of the press forming apparatus for paper lid. FIG. 6 is a diagram showing the principle of another embodiment of the press forming apparatus for paper lid according to the present invention. Action explanatory drawing of the press forming apparatus of the paper lid of the embodiment (part 1)
FIG. 8 is a diagram for explaining the operation of a paper lid press molding apparatus according to another embodiment (part 2).
9 is a diagram showing another embodiment of the pin advancing / retreating means according to the present invention. FIG. 10 is a diagram for explaining the operation of FIG.
DESCRIPTION OF SYMBOLS 10 ... Paper cover, 11 ... Cavity of the center of a paper cover, 16 ... Protrusion, 20 ... Press molding apparatus of a paper cover, 21 ... Circular groove, 22 ... Center protrusion, 24 ... Female type | mold, 25 ... Female type | mold or female 26. Female mold shaft, 27 ... Female mold center, 28 ... Radiation, 30 ... Male mold, 31 ... Peripheral wall, 33 ... Outer wall surface of peripheral wall, 34 ... Recess, 40 ... Pin, 41 ... Pin end, 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.

Claims (4)

A female mold having an annular groove; a male mold having a peripheral wall that enters the annular groove; a plurality of recesses provided on an outer wall surface of the peripheral wall; and the female mold to advance and retract toward each of these recesses. A press forming apparatus for a paper lid, comprising: a plurality of pins attached to a female die along radiation emitted from the center; and a pin advancing and retracting means for advancing and retracting the pins collectively when the movable die is at the bottom dead center position . 2. The paper according to claim 1, wherein the female mold is a split mold comprising a female mold main body including a central projection for forming a central depression of the paper lid and a female mold ring for bending the edge of the paper lid. Cover press molding equipment. The pin advancing / retreating means includes a cam surface for pushing a pin butt protruding from the outer peripheral surface of the female die or the female ring, and is fitted on the outer peripheral surface of the female die or the female ring so as to be movable along the axis of the female die. 3. The press forming apparatus for a paper lid according to claim 1, comprising: a lifting cam ring and a cam ring moving cylinder for moving the lifting cam ring. The pin advancing / retreating means has a cam surface for pushing the bottom of the pin protruding from the outer peripheral surface of the female mold or female ring, and is fitted to the outer peripheral surface of the female mold or female ring so as to be rotatable around the male axis. The press forming apparatus for a paper lid according to claim 1 or 2, comprising a rotating cam ring and a cam ring moving cylinder for moving the rotating cam ring.

Images