JPS58193111A - Improvement of thermoforming machine connected with trimming press - Google Patents

Abstract

PURPOSE:To keep a thermoformed sheet in fixed shrinkage to prevent faulty trimming by equipping a cutter and a conveyor in series between a thermoforming machine and a trimming press. CONSTITUTION:After a synthetic resin sheet a1 extruded continuously from the T die 12 is cooled down to a temperature suiable to forming, it is supplied by a shot portion intermittently into the thermoforming machine 12. The thermoformed sheet a2 is separated a shot portion at a time by the cutter 18 before it is supplied by the intermittently running conveyor 21 to the trimming press 25. A chamber-type cooling device 22 is provided on the conveyor 21 and cooling air is fed by the blasting fan 24 of the cooling device onto the conveyor 21 to cool the cut formed sheet a3 to a fixed temperature. In this method the cut formed sheet a3 takes a fixed shrinkage to obtain exact trimming.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a thermoforming machine equipped with a trimming press, in which a conveyor is installed between the thermoforming machine and the trimming press, and the forming A sheet cutter is provided, and the conveyor cuts the cut-formed sheet into the required length and causes heat shrinkage independently.
It is characterized in that it is configured to be conveyed in the direction of the trimming press.

As shown in Fig. 1, a thermoforming machine equipped with a conventionally known trimming press clamps the edge edges on both sides of a continuous synthetic resin sheet a with a feed chenol l, and heats the molding length of each I shot. A molded sheet a that is intermittently fed into a molding machine 2 and molded into a predetermined shape by the molding machine.
' is sent to a trimming press 3 to trim the molded product, and the trimmed scrap sheet l' is supplied to a crusher or wound up by a winding and recovery device (not shown). A continuous synthetic resin sheet a whose edges on both sides are gripped by a feeding chain I is extruded from a T die t of an extruder j, and the extrusion temperature is maintained at a thermoforming temperature that does not significantly cool the sheet. In either case, synthetic resin sheet a and molded sheet a
' and scrap sheet a' are characterized in that they are substantially one continuous long sheet.

However, the molded sheet a' was thermoformed by the thermoforming machine illustrated in FIG. 1, released from the mold, and sent out in the direction of the trimming press 3.
and molded product b/, the temperature of the workplace is seasonal - daytime morning;
Changes in the shrinkage rate are noticeable because they change depending on the time of day or night, but if the position between the thermoforming machine 2 and the trimming press 3 remains unchanged, the trimming position will be slightly deviated, causing the long continuous sheet to Therefore, the misalignment accumulates and the positional deviation of trimming becomes severe. Therefore, it is necessary to correct the position of the trimming press 3 according to the temperature conditions, but this correction requires skill. Also for trimming press,
If a problem occurs such as making trimming impossible or causing a significant trimming position shift, it is necessary to stop each of the feeding chenographs 11 and thermoforming machines λ to interrupt thermoforming, and the extruder j is When equipped in tandem, the machine 5
Since it is also necessary to interrupt the sheet extrusion of the trimming press 3, there is a drawback that restarting the operation after repairing the trimming press 3 requires a huge amount of time and labor.

The object of the present invention is to improve the device so that it does not have the above-mentioned defects.

A preferred embodiment of the invention will be described with reference to FIG.

In the figure, l/ is the extruder described in FIG. 1,
Synthetic resin sheet a1 continuously extruded from a T die saw
The edges of both sides of the rim are clamped by a feed cheno 13 having an intermittent transfer converter/4 (the extrusion temperature is slightly cooled to the molding temperature, and the molded length of each shot is placed under the thermoforming machine is. It is fed intermittently between the mold 16 and the upper mold 17.

The thermoforming machine 1S and the trimming press 2S can be of the same type as conventional ones, but a conveyor 2/ is interposed between them, and furthermore, between the thermoforming machine 75 and the conveyor 1. The upper blade 19 is rapidly lowered to conveyor λl between it and the lower blade 20. Shear cutting device it that cuts the fed molded sheet V
will be established. This shear cutting device/r constitutes an example of the cutting device of the present invention. In this embodiment, the conveyor 21 is operated intermittently, and its running speed, running time period, and stop time period are the same as those of the feeding chino 13. That is,
Synchronize with the intermittent feeding operation of the continuous resin sheet a1 to the thermoforming machine/S.

The conveyor 21 conveys a molded sheet a2 having a molded product formed by a thermoforming machine 1S in the direction of a trimming press 2j, and the molded sheet a2 is cut during conveyance to become a cut molded sheet a3.

The cut sheet a3 can also be removed to the side manually or automatically during transport to interrupt the transport. Of course, if lateral removal is to be automated, it should be operated only when a problem occurs in the trimming press 2S and the trimming operation is interrupted. A chamber-type cooling device is installed on the conveyor J at a location that does not interfere with the conveyance of the cut and formed sheet a3, and a cooling fan 2LI blows cooling air between the cooling pipes 23 through which cooling water at a constant temperature passes. The cut and formed sheet a3 on the conveyor 2/J: is fed and cooled to a constant temperature. The shrinkage rates of the cutting sheet 1'a3 and the molded product are always the same, as the cooling temperature of the molded sheet a3 is kept constant.

The trimming press 2S cuts the molded sheet a with the lower die λ on top.
At the same time as the mold 3 is fed, the molded product is trimmed by raising the lower mold roller and lowering the upper mold 27, and sends the molded product to the product stocker. The scrap sheet a4 is sent to a crusher Jlr and crushed.

Moreover, even if a problem occurs in the trimming press j and the trimming operation is interrupted, there is no need to interrupt the extrusion of the synthetic resin sheet a1 by the extruder // and the molding by the thermoforming machine IS, and the cutting operation can be performed from the top of the conveyor l. It is only necessary to remove the formed sheet face to the side and interrupt the feeding to the trimming press 23, so if the press can be repaired in a relatively short time, restarting operation requires many steps and time. There is no need to stop the operation of the extruder//and thermoforming machine is required.

The operation of the above embodiment will be explained.

The extrusion speed of the synthetic resin sheet extruded from the T die of the extruder/l is synchronized with the interval forming operation of the thermoforming machine IS, and the edges of the synthetic resin sheet on both sides are clamped by the feeding cheno 13, and the sheet is transferred to the intermittent transfer conversion device. /F intermittently feeds a length corresponding to the molding length of the I shot of the molding machine tS. (Known) thermoforming equipment is capable of forming a new synthetic resin sheet a1.
The lower mold 16 and the upper mold 7 are operated in the joining direction in relation to the feeding and stopping of the mold, forming a molded sheet a2. Send it to the top.

The shear cutting device/I rapidly cuts the formed sheet a2 sent onto the conveyor l. The length of the cut corresponds to the length of trimming of the formed sheet by one operation of the trimming press λ5. That is, in Fig. 2, the length of the seven shots of the synthetic resin sheet a1 formed by the thermoforming machine IS coincidentally coincides with the length of the trimming process of the formed sheet IJ of the trimming press 2s. In some cases, for example, there is a model in which six rows of molded parts are formed in the feed direction by one operation of the thermoforming machine/3, and the trimming press 2S trims two rows at a time. The molded sheet a2 is cut into two rows of molded products. Of course, in this case, it is also possible to cut every six rows.

Since the continuity of the cut and formed sheet a3 on the conveyor 2/conveyor 2 that has been cut as described above is interrupted, even if it is cooled to a certain humidity by the cooling device 2, only the cut and formed sheet a3 will shrink at that time. This occurs, and the preceding and following cut sheets a3 are completely unaffected.

Therefore, even if the position to be trimmed by the trimming press-5 is slightly deviated due to the shrinkage, the deviation will remain very small and the shrinkage will not be accumulated on the subsequent cut sheet a3. There is no need to adjust the position of the trimming press itself, unlike the conventional machine described above.

The cut and formed sheet a3 that was laterally removed from the conveyor 21 during the trouble repair of the trimming press 25 is crushed and recovered by the crusher-g, or is sent to the trimming press 5 after finishing the molding operation with the thermoforming machine is. Operates independently to trim moldings.

As has been made clear from the above description, the present invention uses a thermoforming machine to sequentially feed the continuous synthetic resin sheet a1 into the molded sheet a2, which is thermoformed by feeding the continuous synthetic resin sheet al by the length required for molding the shot. The sheet is not sent as a continuous sheet to the provided trimming press 2S, but is sent onto the conveyor 21, and cut into an appropriate length by a cutting device to break the continuous shape, and then cut and formed sheet a3 by the conveyor 2/.
is conveyed in the direction of the trimming press 2S, and with the above-mentioned improvements, the cut and formed sheet a is conveyed on the conveyor 21, etc.
3. Even if the molded product shrinks due to heat dissipation, it does not affect or be affected by the shaped sheet. Therefore, even if the position to be trimmed by the trimming press 2S is slightly displaced due to shrinkage, there is no risk of the shrinkage increasing due to accumulation. It is possible to completely eliminate the defects of the conventional machine to be adjusted, and even if there is a problem in the trimming press that makes the trimming operation malfunctioning or impossible, it is possible to feed the continuous synthetic resin sheet a1 to the thermoforming machine tS and thermoform it. Since sheet forming by the machine can be continued without taking any action to stop the operation, it is only necessary to remove the cut and formed sheet A3 cut to a certain length from the conveyor to the side, so it is possible to The steps and time required for turning over and restarting can be omitted, and the actual thermoforming work can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a side view showing an outline of a conventional arrangement side, and FIG. 2 is a side view showing an embodiment of the present invention. 13→Feeding chain, lS→thermoforming machine, /l→shear cutting device, 2/→conveyor, -5→trimming press 68-

Claims (1)

[Claims] A conveyor is installed between the thermoforming machine and the trimming press, and a cutter for the formed sheet is installed between the conveyor and the thermoforming machine, and the conveyor cuts the sheet to a required length and causes heat shrinkage independently. An improvement to a thermoforming machine equipped with a trimming press, characterized in that the formed sheet is conveyed in the direction of the trimming press.