TW201808581A - Resin sheet cutter which will not generate swarf, has shorter cutting time, and which can be adjusted easily - Google Patents

Abstract

The object of the present invention is to provide a resin sheet cutter which will not generate swarf, has shorter cutting time, and can be adjusted easily. The resin sheet cutter of the present invention has: a platform 3 carrying the resin sheet to be cut; a band-plate like knife 8 which is held above the said platform 3 in such a manner that the knife tip faces toward the upper surface of the platform 3, and extends parallel to the upper surface of the platform 3; a knife holder 7 to hold knife 8; and a crankshaft mechanism 6 (knife ascending and descending mechanism) which makes the knife holder 7 and knife 8 ascend and descend integrally. The crankshaft mechanism 6 makes knife 8 descend until the knife tip contacts with the upper surface of the platform 3, so as to cut the resin sheet carried on the platform 3. The resin sheet cutter of the said constitution will not generate swarf and can cut resin sheet in a short period of time. Also, the knife position can be adjusted easily.

Description

Resin sheet cutter

The present invention relates to a resin sheet cutter for cutting a wide and rigid resin sheet.

Generally, a hard resin sheet such as polycarbonate is manufactured by extrusion molding. After continuously extruding from an extruder that performs the extrusion molding, it is cut to a specific length to become a product. The resin sheet cutting machine (hereinafter referred to as "cutting machine") that performs this cutting is mostly to move the circular saw in the extrusion direction (sheet moving direction) while following the extrusion speed of the extruder. The person also moves in the cutting direction (sheet width direction) (for example, refer to Patent Document 1). However, if the resin sheet is cut with a circular saw, cutting powder (chips) will be generated during the cutting. Therefore, a step for removing the cutting powder adhered to the resin sheet due to static electricity is required, and it is also used in The cutting powder sandwiched between the extruder and the cutter between the protective film covering the upper and lower surfaces of the resin sheet and the resin sheet may cause poor quality in subsequent steps. In addition, because it takes a long time to cut, it is sometimes difficult to apply to the production of wide or short resin sheets. If the extrusion speed is large, the circular saw sheet must be correspondingly cut. The moving range of the moving direction increases, and there is also the problem of the large size of the cutting machine as a whole. On the other hand, if a cutting method is used as the cutting method, no cutting powder is generated and the cutting time is short. Therefore, the above-mentioned problem of cutting with a circular saw can be solved. However, cutting with a shear cuts the thicker the resin sheet, the more likely it is to break. Therefore, it is necessary to accurately manage the interval between the upper and lower knives, and to cut the upper and lower knives before or during the cutting operation. Interval adjustment is very troublesome. On the other hand, in Patent Document 2, similar to the above-mentioned cutting and cutting, as a cutting method in which no cutting powder is generated and the cutting time is short, it is proposed that the resin sheet can be driven simultaneously from above and below. A method of cutting a resin sheet with a knife and a fixed knife by brittle failure. In this cutting method, the main point is to minimize the time difference between driving the movable blade and the fixed blade across the width direction of the sheet, and the deviation of the moving direction of the sheet between the movable blade and the fixed blade. Therefore, as with cutting and cutting, the adjustment of the interval between the movable knife and the fixed knife is troublesome, and the driving timing of the two-piece knife must also be adjusted. Moreover, since the cut surface of the resin sheet after cutting is almost a brittle cross-section, the appearance as a product is also not good. In addition, as a cutting method other than the above, the use of a laser or a water jet is also considered, but this cutting method is not only costly, but also has the difficulty of a long cutting time as in the case of using a circular saw. In addition, chips different from the cutting powder of the circular saw will be generated, and the chips must also be processed. [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2002-66990 [Patent Literature 2] Japanese Patent Laid-Open No. 2005-59156

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a resin sheet cutting machine that does not generate chips, has a short cutting time, and can easily perform an adjustment operation. [Technical Means for Solving the Problem] In order to solve the above-mentioned problem, the resin sheet cutting mechanism of the present invention is provided with: a platform on which a resin sheet to be cut is placed; and a plate-shaped knife that uses a knife The posture where the tip faces the upper surface of the platform and extends parallel to the upper surface of the platform is maintained above the platform; and a tool lifting mechanism that raises and lowers the tool; and lowers the tool to its position by the tool lifting mechanism. Until the blade tip contacts the upper surface of the platform, the resin sheet loaded on the platform is cut off. That is, the plate-shaped cutter held above the platform is lowered until the tip of the blade comes into contact with the upper surface of the platform, and the resin sheet on the platform is cut to prevent chipping and energy generation. Cutting can be performed in a short time, and the position of the tool can be easily adjusted. Here, when the thickness of the resin sheet is 6 mm or less and the cutting length (sheet width) is 2000 mm or less, it is preferable that the cutter includes the following: a cutter body having a constant thickness and a tip portion The cutting edge portion is formed in a triangular shape in the thickness direction section by two inclined surfaces inclined with respect to the front and back surfaces of the tool body; and the thickness of the above-mentioned tool body is 0.2 to 3.0 mm (preferably 0.2 to 0.5 mm). ), The angle formed by the two inclined surfaces forming the blade tip portion is 15 to 30 degrees (preferably 15 to 25 degrees). In addition, if the tool is configured to be held in a tool holder that is detachably mounted on the resin sheet cutter body and is integrally exchangeable with the tool holder, the tool exchange can be facilitated and the tool can be replaced in a short time. Perform the exchange operation. [Effects of the Invention] The resin sheet cutting machine of the present invention is configured as described above so that the blade with a plate shape held above the platform is lowered until the tip thereof comes into contact with the upper surface of the platform. Those who make the resin sheet on the platform generate chips and can be cut, so there is no need for the chip processing step, and there is no risk that the chips will cause poor quality in the subsequent steps. In addition, compared with those who use circular saws, cutting can be performed in a short time, so it has a wide range of applications for manufacturing wide or short resin sheets, and it can shorten the tool when the extrusion speed is large. The movable range of the sheet moving direction reduces the size of the entire cutting machine. Moreover, compared with the cutting and cutting or the above-mentioned cutting with a movable knife and a fixed knife, only one tool is used, so the adjustment of the tool position is easier, and the cutting operation can be performed in a short time before or during the cutting operation. Adjust the job. Furthermore, the cutting sound can be reduced more than the cutting or cutting of a circular saw, and the cutting surface is smooth, so that the appearance of the product is better.

Hereinafter, embodiments of the present invention will be described based on the drawings. The resin sheet cutting machine is shown in FIG. 1 and FIG. 2. The main part of the cutting machine body is composed of a rectangular plate-shaped base 1 and standing surfaces on both sides of the base 1. One pair of rectangular frames 2, a platform 3 erected on the upper surfaces of the upper sides of the two rectangular frames 2, a flat plate-shaped lifting member 4 arranged above the platform 3, and fixed to both sides of the lifting member 4 A column member 5 and a crank mechanism 6 for vertically lifting the lifting member 4 and the two column members 5; and a tool holder 7 is installed at the lower edge of the lifting member 4 and is held by the belt of the tool holder 7. The plate-like cutter 8 cuts the resin sheet supplied to the platform 3 continuously from an extruder (not shown) to a predetermined length. In this cutter, a hard resin sheet such as a polycarbonate resin having a thickness of 6 mm or less and a cutting length (sheet width) of 2000 mm or less is used as a cutting target. Although the abutment 1 is not shown in the figure, the base 1 is reciprocally movable in the sheet moving direction and is connected to a servo motor via a motion conversion mechanism that converts a rotary motion into a linear motion. In addition, when the cutting machine performs the cutting operation, it is driven by the servo motor to follow the extrusion speed of the extruder to move to the downstream side of the sheet, and returns to the original position after the cutting is completed. On the upper surface of the platform 3, at a position opposite to the tip of the cutter 8, a rod-shaped cutter receiving portion 3a having a rectangular cross section is embedded. In addition, since the tool receiving portion 3a is in contact with the tip of the tool 8 during a cutting operation described later, the tool receiving portion 3a can be exchanged according to the damage condition. In addition, L-shaped side plates 9 are erected from both sides of the upper surface of the platform 3, and guide plates 10 for guiding the column members 5 in the vertical direction are fixed to the side plates 9. In addition, each of the column members 5 passes through the platform 3 in the vicinity of the standing position of the side plate 9, and is connected to the crank mechanism 6 with a leg portion 5 a provided on the lower end side thereof. The above-mentioned crankshaft mechanism 6 includes: a servo motor 11 that is provided on the base 1; a crankshaft 13 that is connected to the servo motor 11 by a ribbon 12; and a connecting member 14 that connects the crankshaft 13 to each of the column members 5. Each of the leg portions 5a is rotatably connected. Both ends of the crankshaft 13 are rotatably supported by a support member 15 provided on the lower surface side of the platform 3. When the servo motor 11 is driven, each of the column members 5 connected to the crankshaft 13 is guided by the guide plate 10 to be raised and lowered along with the rotation of the crankshaft 13. The holder 7 and the cutter 8 are also raised and lowered integrally. That is, the crank mechanism 6 is a tool lifting mechanism for lifting and lowering a tool. Moreover, as shown in FIG. 3, the cutter 8 is slightly in contact with the cutter receiving portion 3 a of the platform 3 at the lowest point. As shown in FIG. 1 and FIG. 4, the lifting member 4 is provided with a plurality of windows 4 a at the lower portion, and the holder mounting bolts 16 are screwed into the tool holder 7 from the lower edges of the windows 4 a. Each holder mounting bolt 16 has a head having a size that can be easily grasped by hand so that the tool holder 7 of the elevating member 4 can be easily attached and detached. In addition, a plurality of stoppers 17 are provided at the lower edge portion of the downstream side surface of the lifting member 4 for positioning the sheet moving direction when the cutter holder 7 is mounted. The above-mentioned tool holder 7 is a long member formed in a U-shaped cross section as shown in FIGS. 4 and 5. Most of the cutter body 8 a of the tool 8 is inserted into the U-shaped plate together with a plate-shaped pressing plate 18. Inside of section. Then, the pressure plate 18 is pressed by the head bolt 19 screwed in from the outer side surface of the side wall on one side (downstream side), thereby sandwiching the cutter body 8a with the pressure plate 18 and the side wall on the other side (upstream side). Thereby, the cutter 8 is held on the cutter holder 7 in a posture in which the tip of the cutter 8 faces the upper surface of the platform 3 (tool receiving portion 3 a) and extends parallel to the upper surface of the platform 3. Moreover, in order to facilitate the tool exchange operation described later, protrusions 7a are provided on both end surfaces of the tool holder 7 in the longitudinal direction, and a tool holder that is accommodating and detached from the lifting member 4 is provided at the lower end of both ends of the lifting member 4. The holder receiving portion 4b of the protrusion 7a of 7 (see FIG. 1). As shown in FIGS. 1 and 4, a metal holder 20 having a U-shaped cross section is attached to the tool holder 7 at two places in the lengthwise direction on the outer side surface of the side wall on one side. Each metal piece 20 is fixed with a bolt in a state where the opening of the U-shaped cross section faces downward, and a U-shaped notch 20a is formed from the lower edge of the upstream side wall. The above-mentioned tool 8 is shown in FIG. 6 and includes: a tool body 8a with a constant thickness; and a tool tip portion 8b whose cross section in the thickness direction is formed into a triangle by two inclined surfaces inclined with respect to the front and back surfaces of the tool body 8a Shape, and the thickness T of the tool body 8a is 0.2 to 3.0 mm (preferably 0.2 to 0.5 mm), and the angle θ formed by the two inclined surfaces forming the tip portion 8b is 15 to 30 degrees (preferably 15 to 25 degrees), can be formed from carbon tool steel, high speed steel, hard alloy, stainless steel, ceramics, etc. Next, the cutting operation of the cutting machine will be described. Between the cutting and the extruder, the following components (not shown) are provided: a roller conveyor supporting the lower surface of the resin sheet from the extruder to the cutting machine; a film coating device, which The protective film is coated on the upper and lower surfaces of the resin sheet in the middle; the labeling machine attaches the label to the upper surface of the resin sheet near the downstream end of the roller conveyor; and the take-up roller is downstream of the roller conveyor The resin sheet is drawn at the end and fed into the cutter. That is, the resin sheet continuously extruded from the extruder is moved to the downstream side with the lower surface supported by the roller conveyor, and the protective film is coated on the upper and lower surfaces by the film coating device, and the labeling machine is on the upper side. After the label is affixed on the surface, it is fed into the cutting machine by a pickup roller. In the cutting machine, once the cutting position of the resin sheet reaches a specific position, the abutment 1 will follow the extrusion speed of the extruder and start to move to the downstream side. ) 6, the pillar member 5, the lifting member 4, the tool holder 7 and the tool 8 start to descend integrally. Moreover, as shown in FIG. 3, the tip of the cutter 8 comes into contact with the cutting position of the resin sheet (two-point chain line in FIG. 3), and then comes into contact with the upper surface of the platform 3, thereby cutting the resin sheet. . The cut resin sheet is sent to the next step by a discharge conveyor (not shown) provided on the downstream side of the cutting machine. In addition, after the cutting operation, the base 1 of the cutting machine is moved to the upstream side and returned to the original position, and the column member 5, the lifting member 4, the tool holder 7 and the tool 8 are integrally raised and returned to the original position. Next, the tool exchange operation of the cutting machine will be described. When performing tool exchange, first, with the crank mechanism 6 stopped, loosen the holder mounting bolts 16 screwed in from the windows 4a of the lifting member 4, so that the tool holder 7 falls and the lifting member 4 becomes The holder receiving portion 4b supports the state of the protrusions 7a at both ends. In this state, as shown in FIG. 4, the flat plate portion 21 a of the front end of the rod-shaped jig 21 is inserted into the U-shaped section from below the metal piece 20 mounted on the tool holder 7 to make the front end of the jig 21. The outer periphery in the vicinity abuts the peripheral edge portion inside the notch 20 a of the metal member 20. Then, the tool holder 7 is slightly lifted from the holder receiving portion 4b by the jig 21, is drawn out to the upstream side of the cutter, and moves to a position deviated from above the resin sheet. As described above, after the cutter holder 7 integrated with the cutter 8 is removed from the cutter body, another cutter holder 7 that has previously held a new cutter 8 is mounted on the cutter in the reverse order as described above. Machine body. In addition, when a new cutter holder 7 is inserted from the upstream side of the cutting machine to below the lifting member 4, it can be easily positioned in the sheet moving direction by abutting against the stopper 17 provided on the lifting member 4. . In addition, the removed tool holder 7 is turned upside down (see FIG. 5), and the head bolt 19 is loosened to exchange the tool 8 itself. After the position of the new tool 8 is adjusted with high accuracy, it is tightened again. The head bolt 19 can be prepared for the next tool change operation. This resin sheet cutting machine has the above-mentioned structure. As long as the plate-shaped cutter 8 held above the platform 3 is lowered until the blade tip contacts the upper surface of the platform 3, the platform 3 can be cut. Resin sheet without chipping. Therefore, there is no need for chip treatment as in the previous circular saw, and there is no risk of poor quality due to chips. In addition, compared with those who use circular saws, it can cut in a short time, so it has a wide range of applications for manufacturing wide or short resin sheets. It can also shorten the length of the cutter 8 when the extrusion speed is large. The movable range of the sheet moving direction miniaturizes the entire cutter. Moreover, since only one tool 8 is used, it is easier to adjust the position of the tool compared to cutting using two tools such as cutting and cutting. In addition, since the cutter 8 is held in advance in the cutter holder 7, and the cutter holder 7 is detachably attached to the cutting machine body, the cutter 8 and the cutter holder 7 can be exchanged integrally. This exchange operation can be performed in a short time without being skilled, so as long as the exchange operation is performed during the extrusion operation, although several defective pieces are not cut, it is the same as stopping the extrusion operation and placing the cutter itself on the cutter body Compared with the case of loading and unloading, the overall efficiency of the resin sheet manufacturing operation can be greatly improved. In addition, the resin sheet cutting machine of the present invention is not limited to those that cut the resin sheet continuously extruded from the extruder as in the embodiment, and of course, it can also be applied to batch processing to cut a sheet having a certain size. Part of the resin sheet. In the cutting machine for batch processing, no moving mechanism of the base is needed.

1‧‧‧ abutment
2‧‧‧ rectangular frame
3‧‧‧ platform
3a‧‧‧Tool receiving unit
4‧‧‧ Lifting member
4a‧‧‧window
4b‧‧‧Receiver holder
5‧‧‧ post member
5a‧‧‧foot
6‧‧‧Crankshaft mechanism (tool lifting mechanism)
7‧‧‧ Tool holder
7a‧‧‧ protrusion
8‧‧‧ cutter
8a‧‧‧tool body
8b‧‧‧ blade tip
9‧‧‧ side plate
10‧‧‧Guide Board
11‧‧‧Servo motor
13‧‧‧ crankshaft
14‧‧‧ connecting member
15‧‧‧ supporting components
16‧‧‧ holder mounting bolts
17‧‧‧stop
18‧‧‧ pressure plate
19‧‧‧Head bolt
20‧‧‧Metal Parts
20a‧‧‧ gap
21‧‧‧Fixture
21a‧‧‧ Flat Department
IV-IV‧‧‧Line θ‧‧‧Angle

Fig. 1 is a front view of a resin sheet cutter according to the embodiment. FIG. 2 is a left side view of FIG. 1. FIG. 3 is an explanatory diagram of a cutting operation corresponding to FIG. 2. FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG. 1. FIG. 5 is an external perspective view of a state where the tool holder of FIG. 1 is turned upside down. FIG. 6 is an explanatory diagram of the shape and size of the cutter of FIG. 1. FIG.

2‧‧‧ rectangular frame

3a‧‧‧Tool receiving unit

4‧‧‧ Lifting member

4a‧‧‧window

5‧‧‧ post member

5a‧‧‧foot

6‧‧‧Crankshaft mechanism (tool lifting mechanism)

7‧‧‧ Tool holder

8‧‧‧ cutter

9‧‧‧ side plate

10‧‧‧Guide Board

13‧‧‧ crankshaft

14‧‧‧ connecting member

15‧‧‧ supporting components

16‧‧‧ holder mounting bolts

Claims (3)

A resin sheet cutting machine comprising: a platform carrying a resin sheet to be cut; and a plate-shaped cutter with a blade tip facing the upper surface of the platform and extending parallel to the upper surface of the platform The posture is maintained above the platform; and a tool lifting mechanism that lifts the tool; and the tool is lowered by the tool lifting mechanism until the tip of the tool contacts the upper surface of the platform, thereby cutting off the load. Resin sheet on the above platform. For example, the resin sheet cutting machine of claim 1, wherein the thickness of the resin sheet is 6 mm or less and the cutting length is 2000 mm or less, and the cutter includes a cutter body and a cutter tip portion having a constant thickness. The cross section in the thickness direction is formed into a triangular shape by two inclined surfaces inclined with respect to the front and back surfaces of the tool body; and the thickness of the tool body is 0.2 to 3.0 mm, forming the two inclined surfaces of the blade tip. The angle is 15-30 degrees. For example, the resin sheet cutting machine of claim 1 or 2, wherein the cutter is held in a cutter holder and can be exchanged integrally with the cutter holder, and the cutter holder is detachably mounted on the resin sheet to cut Off the body.