JP3000506B2 - Punching machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a punching machine (trimming machine) for punching a molded product of a plastic sheet molded by a molding machine such as vacuum or compressed air into individual products.

[0002]

2. Description of the Related Art A plastic sheet is molded by a molding machine using a raw material roll obtained by winding a raw material of a plastic sheet.
One line is composed of a roll, a molding machine, a punching machine, and a take-up roll for winding a punched sheet. Molding machine is the best in the industry
In one operation called a shot, a total of 15 molded products are formed in a plurality of stages including a plurality of stages perpendicular to the sheet conveying direction as one stage, for example, three stages in which each stage has five stages. To the punching machine. The punching machine punches one step at a time, ie, five individual products, with one operation of a cutting blade composed of an upper blade and a lower blade.

[0003] In such a conventional punching machine, the upper blade that moves up and down and the lower blade that receives the upper blade are both fixed types that do not move back and forth in the sheet conveying direction. The sheet sent from the molding machine causes a shift in the timing between the operation of the punching machine and the sheet feed, a shift to the left and right in the sheet transport direction, and the like. Since the sheet must be accurately stopped at the punching position, a gap of 2 to 3 m is provided between the molding machine and the punching machine, during which the sheet is slackened. As a result, the molding line becomes long, and a large line installation area is required.

In a so-called simultaneous punching machine, which punches during a molding operation in conjunction with a molding machine, the same number of punching blades as a molding die is required. Since the punching blade is expensive, the manufacturing cost of the punching machine is several times that of the punching machine that punches out the molded product one step at a time, and if the number of molded products punched out in one operation increases, the maximum is two steps, Beyond that, it was technically impossible to produce.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate a gap between a molding machine and a punching machine, which is conventionally required to loosen a sheet.

[0006]

SUMMARY OF THE INVENTION The features of the present invention is to a plurality one-stage perpendicular to the conveying direction of the sheet, a plurality of stages a plastic sheet molded article, the molding machine for molding a single operation, molding Do not sag the sheet sent from the machine
The same number of single-stage upper and lower blades as the one-stage molding die of the molding machine are connected, and the molding machine operates one stage at a time. only molding the number of stages of the machine sheet
There is a drive mechanism that moves while punching sequentially with the sheet fixed .

[0007]

The punching machine is moved by the drive mechanism while punching out the molded products one by one while the sheet sent from the molding machine is stopped. For example, punching is performed sequentially while moving from the stage of the molded product farther from the molding machine to the molding machine side, and when all stages are punched, the sheet that has been sent is sequentially punched while moving in the opposite direction. . Since punching is performed in conjunction with the operation of the molding machine, there is no need to sag the sheet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing an example of a molding line, reference numeral 1 denotes an original roll obtained by winding a plastic sheet S as a material;
Reference numeral 2 denotes a vacuum or pressure forming machine, and 3 denotes a molding die. 4
Numeral 5 denotes a punching machine according to the present invention, and numeral 5 denotes a take-up roll for winding a cassheet S 'after punching a product W.

This molding machine 2 has one operation (one shot)
Thus, a total of 15 molded articles W 'are formed in three stages, with five stages in the direction perpendicular to the sheet S transport direction as one stage. The formed product W 'is sent to the punching machine 4 via the feed roller 6. The product W punched by the punching machine 4 is transferred to a conveyor 7
It falls down and is carried out by a conveyor. The punched cassheet S 'is taken up by a take-up roll 5.

The outline of the punching machine 4 is as follows.
Is an upper blade, which is detachably attached to the upper holder 9. Reference numeral 10 denotes a lower blade, which is detachably attached to a lower holder 11 connected to the upper holder 9. Numeral 12 denotes a crank device for punching out a molded product W 'by moving the upper holder 9 up and down. Instead of the crank device 12, an air or hydraulic cylinder can be used.

Reference numeral 13 denotes a servomotor, which is a shaft coupling 14.
The feed screw 15 is connected via the. A female screw 16 is attached to the lower holder 11, and a feed screw 15 is screwed to the female screw 16. The servo motor 13 is
Driven by a signal from a control unit (not shown) of the punching machine 4, the upper and lower blades 8, 10 are accurately moved to a predetermined position and stopped.

In the illustrated embodiment, the punching machine 4 punches out five molded products W 'in one operation, one stage, and 3 moldings in one operation of the molding machine 2.
It is configured to operate. That is, after one operation at the position a, it moves to the position b and performs one operation, and further moves to the position c to perform one operation. That is, the punching machine 4 is operated during one operation of the molding machine 2 by the number of stages of the molding die 3 of the molding machine 2. In the case of the embodiment, one operation of the molding machine 2 is 4 operations.
Second, one operation of the punching machine 4 is 1.2 seconds.

The punching machine 4 is changed to a, b, c
It is also possible to move to the position of a after the operation at the position of a, or to move to the position of the c after operating at the positions of c, b and a. It is not preferable because the time loss is large.

2 to 4 show details of the driving mechanism of the punching machine 4. FIG. Reference numeral 17 denotes a slide ball bearing of a guide member fixed to the upper surface on both left and right sides of the frame 18.
Reference numeral 9 denotes a guided member having a groove 20, which is fixed to the bottom surface of the lower holder 11, and the groove 20 is slidably fitted in the slide ball bearing 17. Therefore, the upper and lower holders 9 and 11 are movable in parallel to the sheet S transport direction. A guide rail may be used as a guide member instead of the slide ball bearing.

A motor stand 21 is fixed to the frame 18 and has a servo motor 13 mounted thereon. A bearing stand 22 is fixed to the frame 18 and has a bearing 23 for pivotally supporting the other end of the feed screw 15. Reference numeral 24 denotes a support for a sliding member 28 described later, which is fixed to the frame 18 along the sheet S transport direction. Reference numeral 25 denotes a guide plate.
Fixed on top. Reference numeral 26 denotes a thin rod-shaped stopper, which is fixed on the support base 24 on the frame 18 side.

Reference numeral 27 denotes a female screw mounting plate,
Has been fixed. 28 is a sliding member having a U-shaped cross section,
The groove 29 shallowly recessed at the bottom is formed on the guide plate 25, and the projection 30 on the frame 18 side is formed with the guide plate 25 and the stopper 2.
6 so as to be sandwiched therebetween. The female screw mounting plate 27 is fixed to the side surface of the sliding member 28. A connecting member 31 is fixed to the side surface of the lower holder 11 and the upper surface of the sliding member 28.

When the servomotor 13 is driven to rotate the feed screw 15, the sliding member 28
As a result, the upper and lower holders 9 and 11 move in the transport direction of the sheet S.

It is to be noted that an ordinary motor is used instead of the servomotor 13.
It is also possible to position the stop position of the punching machine 4 with a position detection sensor such as an electric light tube by using a positioner.

[0019]

According to the present invention, unlike the conventional punching machine having a fixed punching position, a gap for slackening the sheet is not required between the molding machine and the punching machine, and the molding line is shortened. The installation area can be reduced.

Since the conventional molding machine and punching blades can be used as they are, the cost of newly manufacturing the molding machine and expensive punching blades can be saved, and the same number of punching blades as the molding die is not required unlike the simultaneous punching machine. The production cost is low because only one cutting blade is required, and the production is technically easy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a molding line.

FIG. 2 is a front view showing a driving mechanism.

FIG. 3 is a side view showing a driving mechanism.

FIG. 4 is a plan view of a main part showing a driving mechanism.

[Explanation of symbols]

 2 molding machine 3 molding die 4 punching machine 8 upper blade (pulling blade) 9 upper holder 10 lower blade (pulling blade) 11 lower holder 13 servo motor 15 feed screw 16 female screw S sheet W product W ' Molding

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B26D 5/02 B26D 5/20 B26F 1/40 B29C 71/00

Claims (4)

(57) [Claims] 1. A method in which a plurality of sheets orthogonal to a sheet conveying direction is
The molded article of the plastic sheet having a plurality of stages
The sheet sent from the molding machine to the molding machine
Is installed so that it does not sag.
The punching blade made of upper blade and the lower blade of the molding die and the same number of single-stage stage, while the molding machine is operated 1, stage by stage 1 operation, while fixing the sheet only forming stages of the molding machine A punching machine equipped with a drive mechanism that moves while punching sequentially. 2. The punching machine according to claim 1, wherein the drive mechanism alternately performs a forward drive in which the punching blade advances to the molding machine side and stops, and a reverse drive in which the punching blade retracts from the forward stop position and stops. 3. The punching machine according to claim 1, wherein the drive mechanism comprises a feed screw which is rotated by a servo motor, and a female screw which is attached to a lower holder having a lower blade and is screwed to the feed screw. Machine. 4. The punching machine according to claim 3, wherein the lower holder is guided by a guide member provided on the frame.