JPH0665473B2 - Method and apparatus for trimming molding sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for trimming a molded sheet in the production of a plastic packaging container or the like, and more particularly,
The present invention relates to a method and apparatus for aligning the position of a molded article on a molded sheet with a punching blade on a punching die of a trimming machine in order to accurately punch individual molded articles formed on a plastic sheet from the molded sheet. .

(Prior Art) Conventionally, when producing a plastic molded product such as a plastic packaging container from a thermoplastic sheet such as polypropylene sheet or polystyrene paper,
For example, as described in Japanese Examined Patent Publication No. 47-28266, a plurality of molded products are molded into a plastic sheet by one shot of a molding machine, and a plurality of molded products for one shot are molded into a sheet portion. Is cut into a standard length, and the molded sheet after this standard length cutting is sent to the positioning table installed at a predetermined distance from the punching blade mold position at the entrance side of the trimming machine and molded into a template on this positioning table. The molded product of the sheet is fitted and positioned, and both side edges of the molded sheet are clamped and held by the chains of the left and right transfer chain conveyor devices, the chain is fed for a predetermined distance, and the planned punching on the punching table is performed. A molded sheet is positioned at a position, and a punching blade die provided with a plurality of cutting blades or punching blades is lowered to simultaneously punch a plurality of molded articles for one shot from the molded sheet.

(Problems to be Solved by the Invention) As described above, after positioning the molded sheet on the positioning table installed at a predetermined distance from the punching blade die, the molded sheet is linearly moved by the transfer chain conveyor device at a predetermined distance. In order to prevent the occurrence of punching errors, it is necessary that the center axis of the formed sheet on the positioning table and the center axis of the punching blade die be exactly coincident with each other. Therefore, when exchanging the blade die, the central axis of the blade die must be exactly aligned with the central axis of the positioning table. However, since the blade die has a considerable size and weight, it is extremely difficult to accurately adjust its mounting position, and it requires a lot of time and skill of the operator for the adjustment. There's a problem.

Furthermore, the plastic sheet material may be excessively stretched due to the temperature during molding, etc., and as a result, the molded sheet is slackened and clamped to the chain of the transfer chain conveyor device. Even if the center axes of the and the positioning table are aligned, the position of each molded product on the molded sheet does not match the position of each punching blade on the blade die, resulting in punching error and product yield. There was a problem of lowering.

The present invention is intended to solve the above-mentioned problem, does not require strict mounting position adjustment at the time of exchanging the punching blade die, etc. It is an object of the present invention to provide a method and a device that enable the position of a punching blade to be precisely aligned with each other, thereby enabling accurate punching.

(Means for Solving the Problems) According to the present invention, in order to achieve the above-mentioned object, a molded sheet on which a plurality of molded products are molded is separated from the punching blade mold position of the trimming machine toward the inlet side at a predetermined interval. After positioning the molded product on the molded sheet by aligning the molded product on the model on this positioning table with the template on this positioning table, move both side edges of the molded sheet to the chains of the pair of left and right transfer chain conveyor devices. So that the formed sheet is positioned just below the punching blade die by sending these chains for a predetermined distance, the punching blade die is lowered, and the punching blade on the punching blade die punches the molded product from the formed sheet. In the trimming method, the pair of left and right punching table side guide rails are used as rails for guiding the respective chains of the pair of left and right formed sheet conveying chain conveyor devices. And a pair of left and right positioning base side guide rails are provided separately, and at least one of these guide rails is moved in the width direction of the forming sheet to adjust the rail position, whereby the formed sheet is punched by the chain conveyor device. It is characterized in that the position of the molded product on the molded sheet and the position of the punching blade on the punching blade die are aligned when they are sent to the position directly below the die.

Further, the present invention, a punching blade die provided to be supported so as to be able to move up and down with respect to the punching bench, and a positioning stand installed at a predetermined interval from the punching blade die position to the inlet side,
A pair of left and right formed sheet conveying chain conveyor devices each having a chain extending on both sides of the punching table and the positioning table, and both side edges of the molded sheet formed with a plurality of molded products at the positioning table position. And a means for holding the chains of the pair of left and right transfer chain conveyor devices so as not to move, a plurality of punching blades are provided on the punching blade mold, and a plurality of templates are arranged on the positioning table. In a trimming device for a molded sheet, which is provided in an arrangement corresponding to, and in which the pair of left and right chain conveyors for transferring a molded sheet is configured to be sent from the positioning table position to the punching blade mold position along each guide rail, The guide rail is a punching table side guide rail, a positioning table side guide rail, and a space between these guide rails. The punching table side guide rail and the positioning table side guide rail are divided into two intermediate guide rails connected to each other, and the guide rail length direction is adjusted by the rail position adjusting device on the fixed support frame at each of two positions separated from each other in the length direction. It is characterized in that it is supported so that the rail position can be adjusted individually in a direction perpendicular to.

(Embodiment) FIG. 1 shows an embodiment of the present invention, 1 is a punching stand of a trimming machine, 2 is a punching blade die, 3 is a plurality of cutting blades or punching blades provided on the punching blade die 4, 4 Is a blade type mounting upper plate to which the punching blade mold 2 is replaceably mounted, and the mounting upper plate 4 is supported by a lifting device 6 such as a hydraulic cylinder device fixed on a stationary machine frame 5 so as to be able to move up and down. There is. Reference numeral 7 denotes a positioning table which is installed on the inlet side of the trimming machine at a predetermined distance from the center position of the punching blade die 2. The positioning table 7 is lowered by a lifting device 8 such as a hydraulic cylinder device as shown by a solid line in the drawing. A positioning model 9 is mounted on the positioning table 7 so as to be capable of moving up and down from a position to a rising position indicated by an imaginary line 7a.

On both sides of the punching table 1 and the positioning table 7 described above, a transfer chain conveyor device 11 for clamping and feeding both side edges of the formed sheet 10 is provided extending in the length direction of the trimming machine. These pairs of chain conveyor devices 11 are equipped with chain sprockets (not shown) at both ends as is known, and the chain 12 is mounted so as to rotate endlessly around these sprockets, and the drive chain sprockets are installed. The chain 12 is configured to be intermittently driven by a servo motor or other suitable driving device to feed the chain 12 a predetermined distance by one motor drive. The chain 12 is provided with clamp needles 13 that pierce the side edges of the molded sheet 10 and hold the side edges of the molded sheet from both sides.

As a result, the forming sheet 10 is positioned by the template 9 on the positioning table 7, and both side edges of the forming sheet 10 are clamped and held by the chains 12 of the left and right transfer chain conveyor devices 11, and then the transfer chain conveyor device 11 is moved by the servo motor. Formed sheet 10 driven by other drive device
Is sent to a predetermined position directly below the punching blade die 2 on the punching table 1 by a predetermined distance.

As shown in FIG. 2, the guide rails for guiding and supporting the chain 12 of the chain conveyor device 11 for transferring the formed sheet are the punching table side guide rails 14, the positioning table side guide rails 15, and these guide rails 14 and 15. The rail end is divided into an intermediate guide rail 16 whose pin end is connected so that it can follow the movement of the rail end, and the punching table side guide rail 14 and the positioning table side guide rail 15 are respectively mounted on a fixed support frame 17. The position adjusting device 18 is supported so that the rail position can be adjusted in the direction perpendicular to the rail length direction, that is, in the width direction of the molded sheet 10.

The rail position adjusting device 18 is provided with, for example, an adjusting support rod 20 with a screw rotatably supported by a bearing hole 19 penetrating the fixed support frame 17 as shown in FIG. Collars 21 are attached by screws 22 at both sides of the support frame 17 to fix the movement of the support rod 20 in the axial direction. A support block 23 is fixed to the outer surface of the guide rail 15, and a screw hole 24 is provided in the support block 23 in a direction perpendicular to the rail length direction. The screwed adjustment support rod 20 is provided in the screw hole 24. The guide rails 15 are screwed in, whereby the guide rails 15 are moved back and forth in the width direction of the molded sheet 10 by rotating the threaded adjustment support rod 20 by the handle 25 attached to the outer end thereof.

Next, a method of aligning the position of the molded product 10a on the molded sheet 10 with the punching blade 3 on the punching blade die 2 using the apparatus having the above-described configuration will be described.

FIG. 2 shows a method of aligning the center axis of the trimming machine, that is, the center axis B of the punching die 2 is parallel to the center axis A of the positioning table 7 but is displaced by a distance d in the width direction of the formed sheet. Indicates. In such a case,
According to the conventional positioning method disclosed in Japanese Patent Publication No. 28266-28266, after the positioning, the molded product 10a on the molded sheet 10 sent to a predetermined position immediately below the punching blade die 2 by the chain 12 is shown by an imaginary line C in FIG. As shown in FIG. 4, the punching blade die 2 is displaced from the punching blade 3 in the width direction of the formed sheet by a distance d, and as a result,
A punching error occurs as shown in the figure.

In order to prevent such a punching error from occurring, according to the present invention, the rail position adjusting device 18 moves both punching table side guide rails 14 in the same direction by a distance d as indicated by an arrow D. Adjust the position of 14. After the adjustment, the molded sheet 10 is positioned by the template 9 on the positioning base 7 and clamped and held by the chain 12 of the transfer chain conveyor device 11 as in the conventional method described above.
12 is driven to feed the formed sheet 10 for a predetermined distance.

As a result, the positions of the punching blade 3 and the molded product 10a on the molded sheet 10 are aligned, as shown by the solid line in FIG. Therefore, by lowering the punching blade die 2, as shown in FIG.
A can be punched accurately.

In the above-mentioned illustrated example, the position of the punching table side guide rail 14 is adjusted, but even if the position of the positioning table side guide rail 15 is adjusted, the molded product 10a on the molding sheet 10 and the punching blade die 2 are similarly adjusted.
The position of the upper punching blade 3 can be aligned, and
It is also possible to adjust the positions of the two guide rails 14 and 15 to match the positions.

Center axis A of positioning base 7 and center axis B of punching die 2
The direction, amount, angle or the like of the positional deviation between the punching blade die 2 on the punching blade die 2 and the molded product 10a on the forming sheet 10 should be determined first after replacing the punching blade die 2. It is possible to know easily and accurately by performing trial punching of the formed sheet.

FIG. 6 shows a position aligning method when the central axis B of the punching blade die 2 deviates from the central axis A of the positioning table 7 by an angle of θ ₁ °.

In the illustrated example, the rail position adjusting device 18 moves both end portions of both positioning base side guide rails 15 in the width direction of the forming sheet as indicated by arrow E to move the positioning base side guide rails 15 to the central axis A, respectively. The position of the guide rail 15 is adjusted by inclining it at an angle of ₂ °. By this rail position adjustment, the molded sheet 10 positioned on the positioning table 7 is moved onto the punching table 1 by the conveyor chain 12, and the molded product 10a on the molded sheet 10 is punched by the punching blade mold 2 as shown in FIG. It is sent to a position aligned with the upper punching blade 3. In FIG. 7, an imaginary line C indicates the position of the molded product transferred on the molded sheet when the rail position adjustment is not performed.

FIG. 8 shows a method for aligning the formed sheet 10 when it is positioned on the template in a slackened state as shown in FIG. 10 due to excessive elongation of the plastic sheet and clamped to the chain of the transfer chain conveyor device. .

In the illustrated example, the positioning table side guide rail 15 is moved by the rail position adjusting device 18 in the width direction of the forming sheet as shown by an arrow F to adjust the position of the guide rail 15.

By this rail position adjustment, the molded sheet 10 positioned on the positioning table 7 is expanded in the width direction by the conveyor chain 12 and transferred to the punching table 1 to form a molded product on the molded sheet 10 as shown in FIG. 10a is sent to a position on the punching blade die 2 which is aligned with the punching blade 3, whereby a molded product is obtained.
10a is accurately cut by the punching blade 3 on the punching blade mold 2 as shown in FIG.

In FIG. 9, an imaginary line C indicates the position of the molded product transferred on the molded sheet when the rail position adjustment is not performed,
In this case, a cutting error occurs as shown in FIG.

(Effects of the Invention) According to the present invention, a molded product can be accurately punched from a molded sheet simply by adjusting the position of the chain rail in the width direction of the molded sheet without strictly adjusting the mounting of the punching blade die. Since the alignment work can be performed very easily, not only the work time for installation adjustment when exchanging the punching die can be significantly shortened, but even an unskilled person can easily perform the alignment, resulting in defective products. It is possible to significantly reduce the yield and improve the yield.

[Brief description of drawings]

FIG. 1 is a partial sectional front view of a trimming apparatus according to the present invention, a part of which is seen in the direction of the arrow as a section on the line II in FIG. 2, and FIGS. 2 to 5 are the first embodiment of the method of the present invention. FIGS. 6 and 7 are explanatory views showing a second embodiment of the method of the present invention, and FIGS. 8 to 11 are explanatory views showing a third embodiment of the method of the present invention. 1 ... Punching base, 2 ... Punching blade type 3 ... Punching blade, 4 ... Blade type mounting upper plate 5 ... Fixed machine frame, 6 ... Lifting device 7 ... Positioning table, 8 ... Lifting device 9 …… Model, 10 …… Molded sheet 10a …… Molded product 11 …… Transfer chain conveyor device 12 …… Chain, 13 …… Clamp needle 14 …… Punching side guide rail 15 …… Positioning side guide rail 16 …… … Intermediate guide rail, 17 …… Fixed support frame 18 …… Rail position adjustment device 19 …… Bearing hole, 20 …… Adjustment support rod 21 …… Collar, 22 …… Screw 23 …… Support block, 24 …… Screw hole 25 …… Handle

Claims (2)

[Claims] 1. A molded sheet on which a plurality of molded products are molded is sent from a punching blade mold position of a trimming machine to a positioning table installed at a predetermined distance on the inlet side, and molded into a template on the positioning table. After aligning the molded products on the sheet, hold both side edges of the molded sheet on the chains of the pair of left and right transfer chain conveyor devices so that they do not move.
In the trimming method of the molded sheet, which sends these chains a predetermined distance to position the molded sheet directly below the punching blade die, lowers the punching blade die and punches the molded product from the molded sheet by the punching blade on the punching blade die, A pair of left and right punching table side guide rails and a pair of left and right positioning table side guide rails are separately provided as rails for guiding the respective chains of the pair of left and right formed sheet transfer chain conveyor devices, and at least these guide rails are provided. One of them is moved in the width direction of the formed sheet to adjust the rail position, whereby the formed sheet on the formed sheet and the punch on the punched blade die when the formed sheet is sent to the position directly below the punched blade die by the chain conveyor device. A method for trimming a formed sheet, which comprises aligning a position with a blade. 2. A punching die which is provided so as to be lifted up and down with respect to the punching stand, a positioning stand which is installed at a predetermined distance from the punching die position toward the inlet side, and the punching stand. And a pair of left and right formed-sheet-conveying chain conveyor devices each having a chain extended on both sides of the positioning table, and the left and right pair of left and right edges of the formed sheet on which a plurality of molded products are formed at the positioning table position. And a means for holding the chain of the transfer chain conveyor device so as not to move, a plurality of punching blades are provided on the punching blade die, and a plurality of templates on the positioning table correspond to the arrangement of the punching blades. Provided in the arrangement,
In a trimming device for a molded sheet configured such that the pair of right and left chain conveyors for transferring a molded sheet are sent from the position of the positioning table to the position of the punching blade along respective guide rails, the guide rails guide the punching side. Two parts that are divided into a rail, a positioning base side guide rail, and an intermediate guide rail connected between these guide rails, and the punching base side guide rail and the positioning base side guide rail are separated in the length direction thereof. 2. A trimming device for a molded sheet, wherein each of the fixed support frames is supported by a rail position adjusting device so that the rail position can be individually adjusted in a direction perpendicular to the guide rail length direction.