JPH07171890A - Forming device of pocketed film - Google Patents

Abstract

PURPOSE:To prevent air from leading through an air chamber over a long period of time. CONSTITUTION:A connecting shaft 36, which is mounted to the lower edge face of a piston rod 20, passes through an inserting hole 39 formed on the top surface of a top mold 6 so as to project in an air chamber 10 constituted in the top mold 6. Into a mounting groove 42, which is provided around the upper side peripheral edge of the inserting hole 39, an annular rubber sealing member 43 fitted under the condition that its top surface side is projected beyond the groove. At the outer periphery at the lower edge part of the piston rod 20, an annular closely contacting part 44 is formed. When the piston rod 20 advances, the lower face of the closely contacting part 44 abuts against the top surface of the sealing member 43 so as to crush the member 4, resulting in bringing the closely contacting part into close contact over its whole periphery with the member 4, resulting in preventing air from leaking through the inserting hole 39, when pressurized air is supplied to the air chamber 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film forming apparatus for pockets used for a press-through pack sheet for packaging objects to be packaged such as tablets.

[0002]

2. Description of the Related Art An example of a conventional molding apparatus of this type will be described with reference to FIG. A lower mold a having a plurality of molding holes b formed on the upper surface thereof is provided below the transport path for transporting the heated synthetic resin film F, and each molding hole b is connected to an air escape hole c. Has been done. A hollow upper mold d having an air chamber e inside is installed on the upper side of the film F, and the same number of through holes f corresponding to the molding holes b of the lower mold a are formed on the lower surface thereof. In the air chamber e, an elevating body g having a pressing rod h protruding from the lower surface and fitted in each through hole f with a clearance is housed. An air cylinder i is attached downward on the upper surface of the upper die d, and a tip of a piston rod j thereof penetrates through an insertion hole k formed on the upper surface of the upper die d to project into the air chamber e, so that the ascending / descending operation is performed. It is connected to body g.

By advancing the piston rod j and lowering the elevating body g, as shown in FIG. 2, each pressing rod h is projected into the corresponding forming hole b to form a recess in the film F, and By supplying pressurized air into the air chamber e and applying air pressure to the recessed portion of the film F through the clearance between the through hole f and the pressing rod h, the film F
Is closely attached to the inner surface of the molding hole b to mold the pocket P.

The seal for preventing air leakage from the insertion hole k of the piston rod j in the air chamber e is provided with the insertion hole k.
This is done by fitting the packing p on the inner circumference of the.

[0005]

However, if the packing p is damaged, air leakage may occur at an early stage.

[0006]

The device for forming a film with a pocket of the present invention has been completed in order to eliminate the above-mentioned drawbacks, and is a rim on the upper surface side of the insertion hole of the upper die piston rod. A ring-shaped sealing member is fitted around the shaft, and a ring-shaped contact portion is provided on the outer periphery of the piston rod so as to be in contact with the upper surface of the seal member when the piston rod advances.

[0007]

When the piston rod advances, the close contact portion provided on the outer periphery of the piston rod is pressed against the seal member around the rim of the insertion hole to be in close contact therewith, whereby the pressurized air supplied into the air chamber is inserted. It is prevented from leaking from.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral F is a strip-shaped synthetic resin film as a base material, which is heated along the horizontal transport path and then intermittently transported to the pocket forming position. There is.

A lower die 1 is vertically movable below the conveying path of the film F at the pocket forming position.
On the upper surface of the lower mold 1, a plurality of molding holes 2 are formed in alignment, and each molding hole 2 passes through a through hole 4 into an air escape hole 3 formed in the lower mold 1. It is connected.

At the upper side of the transporting path of the film F at the pocket forming position, a cover plate 8 is attached to the upper surface of a box-shaped main body 7 having an open upper surface with bolts 9 to form an air chamber 10 therein. However, it is fixed so that the film F can be held between the lower mold 1. On the lower surface of the upper mold 6, the lower mold 1 described above is
The same number of through holes 11 corresponding to the molding holes 2 are formed, and a supply port 12 for pressurized air is formed on one side of the upper surface.

An elevating body 14 is accommodated in the air chamber 10 so that it can be raised and lowered freely.
A pressing rod 15 that fits into the first mold 1 with clearance is provided so as to correspond to the through hole 11 and the molding hole 2 of the lower mold 1.

On the upper surface of the upper die 6, an air cylinder 17 for raising and lowering the lifting body 14 is attached downward. In this air cylinder 17, a piston 19 is slidably fitted in a cylinder 18, and a rod 20 protruding from the piston 19 is inserted into a sliding hole 22 formed in a rod cover 21 via a metal 23. The rod-shaped mounting portion 25 is slidably fitted and protrudes, and is projected from the lower surface of the rod cover 21. The annular mounting portion 25 is fixed to the upper surface of the upper die 6 by bolts 26. Head cover 28 of cylinder 18
The rod cover 21 is formed with supply / discharge ports 29, 30 for supplying / discharging the working air to / from the upper and lower chambers of the piston 19, and the mounting portion 25 is provided with a lateral hole 31 for bleeding air. There is.

A concave hole 33 is formed in the lower end surface of the piston rod 20.
Is formed, and a mounting hole 34 with a female thread is formed at the back end at the center thereof, and the upper end of the connecting shaft 36 having a mounting flange 37 at the lower end is screwed into the mounting hole 34 and fixed. There is.

An insertion hole 39 is opened in the upper surface of the upper mold 6, the lower end side of the connecting shaft 36 penetrates the insertion hole 39 and projects into the air chamber 10, and the mounting collar 37 is moved up and down as described above. It is fitted and connected to a mounting groove 40 formed on the upper surface of 14.

In this embodiment, in particular, the piston rod 2 described above is provided around the upper edge of the insertion hole 39.
The mounting groove 4 is provided directly below the annular peripheral wall around the 0 recessed hole 33.
2, a ring-shaped rubber seal member 43 is fitted in the mounting groove 42 with its upper surface protruding. The above-mentioned peripheral wall corresponding to it is the contact portion 44.

The present embodiment has the above-mentioned structure, and its operation will be described below. When the film F is heated to the front in the transport direction and then transported to the pocket forming position, the lower mold 1 retracted downward is lifted, and its upper surface and the upper mold 6 are moved.
The film F is sandwiched between it and the lower surface of the.

Subsequently, the air cylinder 17 is driven to advance and the piston rod 20 and the connecting shaft 36 are moved downward to lower the elevating body 14, and the pressing rod 15 on the lower surface of the elevating body 14 is shown in FIG. As shown in FIG.
Is heated and easily deformed, the pressing rod 15
It is pushed by and extends to form a depression.

As the piston rod 20 advances,
The lower surface of the contact portion 44 hits the upper surface of the seal member 43 around the insertion hole 39 and crushes it as shown by the solid line in FIG.

Subsequently, when pressurized air is supplied from the supply port 12 into the air chamber 10, the air pressure passes through the clearance between the through hole 11 and the pressing rod 15 as shown by the arrow in FIG. In addition to the recessed portion of F, the film F is further stretched while allowing air on the lower surface side to escape to the hole 3, and is further adhered to the inner surface of the forming hole 2, whereby the pocket P is formed.

At this time, as described above, the close contact portion 44 of the piston rod 20 is brought into close contact with the seal member 43 and the insertion hole 3
Since the air-tight seal is provided to prevent air from leaking from the film 9, proper air pressure acts on the film F to reliably form the pocket P.

When the pocket P is formed, the air cylinder 17 is driven backward to retract the pressing rod 15 into the upper mold 6, and the lower mold 1 is lowered to remove the pocket P from the forming hole 2 and the film F. The portion that has been intermittently conveyed to form the pocket P is sent forward, and the portion that forms the next pocket is conveyed to the pocket forming position, and the above operation is repeated.

In particular, since the seal portion of the insertion hole 39 has a structure that does not damage the air cylinder 17 even if the air cylinder 17 is repeatedly moved back and forth, the seal function is achieved for a long period of time. .

[0023]

As described above in detail, according to the present invention, in order to seal the insertion hole of the piston rod, the piston rod is attached to the seal member fitted around the upper edge of the insertion hole. Since it has a structure in which the close contact portion provided on the outer periphery is in close contact, it is less likely to be damaged earlier than the packing that slides on the piston rod, and can perform the sealing function for a long period of time. There is an effect that the pocket can always be accurately formed.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing an engaging portion between the pressing rod and the molding hole.

FIG. 3 is a partially enlarged cross-sectional view showing a sealing portion of the insertion hole.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

F: Film P: Pocket 1: Lower mold 2: Molding hole
6: Upper mold 10: Air chamber 11: Through hole 14: Lifting body
15: Push rod 17: Air cylinder (drive cylinder)
20: Piston rod 36: Connection shaft 39: Insertion hole
42: Mounting groove 43: Seal member 44: Adhesive part

Claims (1)

[Claims] 1. A lower mold having a plurality of molding holes formed on the upper surface thereof is provided below a conveying path for conveying a heated synthetic resin film, and the inside is an air chamber and is hollow. The upper mold having the same number of through holes on the lower surface as the molding holes is formed so as to sandwich the film between the upper mold and the lower mold, and is fitted in the air chamber with a clearance for each through hole. An elevating body provided with a fitting pressing rod is housed, and the elevating body is connected to a piston rod of a drive cylinder protruding through an insertion hole formed in the upper surface of the upper die, By advancing each of the pressing rods so as to project into the corresponding forming hole, a recess is formed in the film, and pressurized air is supplied into the air chamber to apply air pressure to the recessed portion of the film through the through hole. The film by In a film forming apparatus for a pocket, which is formed by closely contacting the inner surface of a forming hole with a pocket, a ring-shaped seal member is fitted around the upper edge of the insertion hole of the piston rod of the upper mold. In addition, the film forming apparatus with a pocket is provided on the outer circumference of the piston rod with a ring-shaped close contact portion that can be brought into close contact with the upper surface of the seal member when the piston rod advances.