JPS6330643Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an improvement in press-through pack (commonly called "PTP") manufacturing equipment.
More specifically, the present invention relates to an improvement of the film feed roll in the device.

In the current PTP packaging device, as shown schematically in Figure 1, after a thick thermoplastic film (or sheet) F wound on a reel R' is heated between heaters H and H' through a roll, , a regular pocket P between a pair of upper and lower dies D and D',
P... is formed by the upper chute Sh and the supply drum S before passing through the feed rolls R ₁ , R ₂ , dancer roll R ₃ , brake roll R ₄ and reaching between the pair of seal rolls R ₅ , R ₅ ′. the pocket P,
After the specified articles T such as tablets and capsules are filled into P... one by one, the metal foil Al is wound around the reel R' between the seal rolls R ₅ and R ₅ ', and is sent through the rolls. It is sealed by the next roll, then punched out by a punching cutter (not shown), and finally a scrap roll (not shown).
(In addition, in a device dedicated to polyvinyl chloride film, die D,
Vacuum suction rolls are mainly used instead of D′. ).

In the above apparatus, the film F formed into pockets P, P... by the dies D, D' is transferred to the next stage rolls R ₂ to _{R 4} by the intermittent rotation of the film feed roll R ₁ .
is sent to the filling equipment (Sh and S) through
Residual heat remains in the film after being heated by heaters H and H', and therefore it is inevitably subjected to a stretching action by roll _R1 . The extent of this stretching varies depending on factors such as the film material used, film feeding speed, film tension, and room temperature during work, so film feeding roll R ₁
It is difficult to perfectly align the pocket P of the film F' with the recess P' of the feed roll _R1 while keeping the rotation speed and other controllable conditions constant.
If the two do not match, the pocket will be deformed or destroyed.

The above problems can be solved to some extent by applying a phase adjustment means to the feed roll _R1 and correcting the pitch deviation. However, the stretched film conversely begins to shrink as it cools, so even if the pitch is correct on roll _R1 , the pitch may become incorrect again on the next roll.

The present inventor has found that by rapidly cooling the film F' sent from the forming apparatuses D and D', the influence of residual heat can be greatly alleviated.

Based on the above knowledge, the present invention attempts to eliminate the drawbacks associated with stretching and shrinking of PTP films. The purpose is to eliminate the effects of residual heat generated.

In order to achieve the above object, the present invention adopts a structure in which a fixed sleeve is provided around the rotating shaft for the feed roll, and a pair of liquid refrigerant introduction holes and discharge holes are bored in the pipe wall of the sleeve. According to this configuration,
Since the sleeve is fixed, the liquid-tight structure between it and the rotating part can be simplified, which is not only advantageous in terms of work and maintenance, but also because the absolute positions of the refrigerant inlet and outlet holes are constant, making it easier to The advantageous effect is that the refrigerant can be supplied to the position (phase) that requires the most cooling.

An embodiment embodying the above-described feature structure of the present invention will be described below. FIG. 2 is a cross-sectional view of the present film feed roll device corresponding to the film feed roll R ₁ of the conventional device referred to in FIG. 1, and the feed roll 1 projects forward at right angles to the front panel 9 of the device. The front cover plate material 4 and the rear cover plate material 5 are mounted on the circumferential surface of the sleeve 3 fixed as shown in FIG.
The drum 2 is rotatably mounted via a bolt 6', and the center of the front cover plate 4 is connected by a bolt 8 to the tip of a rotating shaft 7 provided through the panel 9. It is fixed. Further, the drum 2 is provided with a plurality of recesses 10, . At the time, it is embedded in the sleeve 3, and its rear end communicates with a refrigerant source (not shown) via a refrigerant inlet 12 and a refrigerant outlet 13, while its tip is opened with its tip facing into the cavity 11. A liquid refrigerant (for example, cold water) W is circulated through the refrigerant passage 14.

O-rings 15a are provided between the front and rear end surfaces of the drum 2 and the front cover plate 4 and rear cover plate 5, and between the circumferential surfaces near the front and rear ends of the sleeve 3 to prevent water leakage, respectively. 15b, 15c, 15d, 15e, and 15f are charged.

The rotating shaft 7 has a gear 16 fixed to its rear end located inside the panel 9, and is rotated by an intermittent drive device via a phase variable device (not shown) that engages the gear 16 and the connecting gear 17. be done.

According to this film feed roll 1, the drum 2
The synthetic resin film is constantly cooled by the refrigerant W, and as a result, the synthetic resin film that moves while in contact with the surrounding surface instantaneously passes through the glass transition point, thereby achieving sufficient dimensional stability to withstand the subsequent process. I come to do it. Therefore, by synchronizing the pitch of the recess on the feed roll 1 with the pitch of the pocket of the film to be fed, the film can be stably fed to the subsequent process. However, it is mechanically troublesome to perform this synchronization operation by adjusting the rotational speed of the roll 1 or moving the rotational axis of the roll 1, so if possible, a phase adjustment device (Fig. 18 ) is preferably attached so that the drive input is transmitted to the rotating shaft of the roll through the device. Incidentally, there are various types of phase adjustment devices, but in the inventor's experience, the product name is ``Harmonik Differential Unit.''
(Harmonik Drive Systems Co., Ltd.) is the easiest way to apply a differential gear mechanism that utilizes an oval flexible outer blade spline and a circular inner blade spline, and allows delicate phase alignment. be.

As detailed above, according to the present invention, the dimensional stability of the PTP film is greatly improved, which not only makes it possible to stably produce PTP with beautiful pockets, but also makes it possible to produce PTP films with beautiful pockets in a stable manner. It has great practical value in that it enables the use of polypropylene film, which has been considered difficult to apply for commercial purposes.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the main parts of a conventionally known PTP packaging device, and FIG. 2 is a cross-sectional view of a film feed roll according to an embodiment of the present invention. 1...Film feed roll, 2...Drum, 3
...Sleeve, 4...Front cover plate material, 5...Rear cover plate material, 6, 6'...Bearing, 7...Rotating shaft, 8...
Bolt, 9...Front panel, 10...Recess, 1
1... Vacancy, 12... Liquid refrigerant inlet, 13... Liquid refrigerant outlet, 14... Refrigerant passage, 15a, 15
b, 15c, 15d, 15e, 15f...O ring, P...pocket, P'...recess, _R1 ...feed roll, 16...gear, 17...connection gear, 1
8...Phase adjustment device, A...Pocket molding section, B
...Packaged object filling and sealing part, F, F'...Synthetic resin film.

Claims (1)

[Claims for Utility Model Registration] (1) The rotating shaft of the film feeding roll is provided with a fixed sleeve around it, and a pair of refrigerant introduction passages and refrigerant discharge passages are provided in the pipe wall of the sleeve, so that the refrigerant is 1. A film feeding roll for a PTP manufacturing apparatus, characterized in that the film is introduced into the roll and discharged from the roll through both passages. (2) The roll according to claim 1, wherein the pair of refrigerant introduction passages and the refrigerant discharge passages are elongated holes bored in a pipe wall of a sleeve that surrounds the rotation axis of the roll.