JP3935016B2 - Molded product gate cutting device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a molded product gate cutting apparatus that cuts a resin molded product into a product and a runner (in the present invention, the runner also includes a sprue).
[0002]
[Problems to be solved by the invention]
A conventional gate cutting device is a resin molded product in which a product (in the present invention, a product is a molded product obtained by cutting a resin molded product into a gate and cutting the runner) at the tip of the runner, A first cylinder portion that opens and closes a pair of nipper blades that are rotatably supported on a mounting plate and a second cylinder portion that moves the first cylinder portion in a direction perpendicular to the rotation direction of the nipper blades are integrated. A plurality of nipper units are attached to the cylinder, and the second cylinder is operated with the resin molded product fixed so that the gate at the boundary between the product and the runner is positioned between a pair of open nipper blades. The first cylinder portion is operated while pressing the nipper blade against the outer surface of the product, and the nipper blade is driven to close to cut the gate to separate them.
[0003]
In this gate cutting device, it is necessary to set and fix the resin molded product so that the gate is positioned with high accuracy between the pair of nipper blades. Could not be done efficiently. When the set state of the resin molded product with respect to the nipper blade is poor, the contact of the nipper blade with the outer surface of the product becomes non-uniform and uncut (burrs) remain, causing a defective appearance of the product.
[0004]
In addition, since the gate is cut with the resin molded product fixed, the stress generated on the gate when the nipper blade bites into the gate becomes the cutting resistance of the nipper blade and the gate cut surface becomes rough, resulting in poor appearance. Have the problem of
[0005]
In particular, for example, in a synthetic resin light guide plate that guides light while totally reflecting light internally, it is necessary to flatten the end surface on which light is incident with high accuracy. Although it is necessary to cut the gate, the above-described request cannot be achieved by the above-described conventional gate cutting apparatus.
[0006]
Furthermore, after the gate is cut by the nipper blade, the first cylinder portion is moved backward to open the nipper blade, but there is no guarantee that the product and the runner are separated so as to be surely separated. In the worst case, separation may be incomplete and remain connected.
[0007]
As described above, if burrs remain in the product or if the gate is poorly cut, it is necessary to perform burring and re-cutting work so that they can be separated later. Therefore, work efficiency was bad.
[0008]
The present invention was invented in order to solve the above-mentioned conventional drawbacks, and the problem is that the stress generated during gate cutting of a resin molded product is released to increase the accuracy of the gate cut surface of the product. An object of the present invention is to provide a molded product gate cutting device.
[0009]
Another object of the present invention is to provide a molded product gate cutting apparatus capable of efficiently cutting a gate of a resin molded product with high positional accuracy.
[0010]
[Means for Solving the Problems]
The present invention provides a molded product holding means provided with a runner holding member for holding a runner of a resin molded product and a product holding member for holding a product of the resin molded product on a support frame, and a resin molded product held by the molded product holding means. A product that regulates misalignment by holding a pair of cutting blades that move and cut the gate of the product in a direction in which the cutting edges approach and separate from each other and a resin molded product held by the molded product holding means In a molded product gate cutting apparatus provided with a fixing means, the runner holding member is supported so as to be movable in a direction approaching and separating from the cutting blade with respect to the support frame, and is always positioned in a neutral position by the elastic force of the elastic member. The elastic member is elastically deformed by moving by the stress generated at the time of cutting the gate so that the stress can be absorbed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings showing a molded product gate cutting apparatus suitable for gate cutting a synthetic resin light guide plate.
1 to 8, the molded product gate cutting device 1 includes a molded product supply / conveying means 3, a molded product holding means 5, a product fixing means 7 and a gate cutting means 9.
[0012]
The left and right frames 11 of the molded product supply / carrying means 3 are fixed to the main body frame 13 of the molded product gate cutting device 1, and the longitudinal direction of the molded product gate cutting device 1 (in the lower right and upper left directions in FIG. Direction). Then, on one end side of the left and right frames 11, a loading device 19 such as a roller conveyor for carrying a container 17 containing a large number of resin molded products 15 to be gated into a supply position, and a resin molded product 15 that has been gate-cut. An unloading device 23 such as a roller conveyor for unloading the container 21 containing the product 15a is provided.
[0013]
The left and right traveling bodies 25 are supported by the left and right frames 11 so as to move in the left and right directions. The left and right traveling bodies 25 are longitudinally orthogonal to the molded product gate cutting apparatus 1 (in the upper right and lower left directions in FIG. Front and rear frames 27 extending in the direction) are provided. A front / rear running body 29 is supported on the front / rear frame 27 so as to move in the front / rear direction, and a lifting / lowering arm 31 is supported on the front / rear traveling body 29 so as to be movable up and down. A chuck 33 is attached to the lower part of the lifting / lowering arm 31. It is done.
[0014]
The chuck 33 is provided on the chuck plate 33a at a position corresponding to the product 15a of the resin molded product 15 (the figure shows the chuck 33 corresponding to the resin molded product 15 having four products 15a. 33b and the number of products 15a are not limited to those shown in the drawing), and a holding member 33c such as a pair of air cylinders provided at the center of the chuck plate 33a and holding the runner 15b of the resin molded product 15. Consists of
[0015]
The left and right traveling bodies 25, the front and rear traveling bodies 29, and the lifting arms 31 are moved to predetermined positions by numerically controlling the amount of movement by, for example, a servo motor. Among them, the lifting arm 31 may be lifted and lowered by a cylinder.
[0016]
The molded product holding means 5 is provided so as to move in the left-right direction and the front-rear direction and to rotate 180 °. That is, the left and right guides 35 are provided at the lower part of the main body frame 13 of the molded product gate cutting apparatus 1, and the left and right guides 35 support the left and right sliders 37 so as to move in the left and right directions. A front / rear guide 39 is fixed to the left / right slider 37, and a front / rear slider 41 is supported by the front / rear guide 39 so as to move in the front / rear direction.
[0017]
A mounting base 43 is fixed to the front / rear slider 41, and a support frame 47 is fixed to a rotating shaft of a rotating member 45 such as an electric motor or an air cylinder provided on the mounting base 43. The support frame 47 is U-shaped in the front, and support arms 49 are horizontally mounted on the left and right ends of the support frame 47, respectively, and gaps through which the gate cutting blades 57a and 57b can enter between the runner holding member 53 described later. To form.
[0018]
Further, support shafts 51 extending in the left-right direction are respectively attached to the lower portions of the side walls of the support frame 47, and runner holding members 53 having a height protruding to the upper surface side of the support frame 47 are provided in the left-right direction. Supported to move. The runner holding member 53 is attached to the support shaft 51 and is always urged so as to be positioned at an intermediate portion in the axial direction of the support shaft 51 by the elastic force of an elastic member 55 such as a rubber ring or a compression spring located on both sides. The
[0019]
A locking groove 53a is provided on the upper surface of the runner holding member 53 as a groove for locking the runner 15b of the resin molded product 15, and the runner 15b is locked in the locking groove 53a to hold the resin molded product 15. . Each support arm 49 located on both sides of the support frame 47 is provided with two product holding members 49 a corresponding to the products 15 a of the resin molded product 15. Accordingly, in the illustrated example, each support arm 49 is provided with two product holding members 49a, for a total of four product holding members 49a.
[0020]
When the resin molded product 15 having two products 15a is to be gate-cut, only the support arm 49 on the side of the gate cutting blades 57a and 57b in the support frame 47 provided so as not to rotate is provided. Two product holding members 49a may be provided.
[0021]
The product holding member 49a is provided with a communicating member 49b made of a sintered material, a mesh member, or a synthetic resin such as communicating urethane through which a large number of air bubbles communicate, and pipes 56 for discharging and sucking air at the lower part. Connected. The pipe 56 injects air from the upper surface of the communication support 49b by a switching valve (not shown) provided between a compressed air generator, a negative pressure generator, and a blower (not shown), Aspirate air from.
[0022]
Gate cutting means 9 is provided on the right side of the main body frame 13. The pair of upper and lower gate cutting blades 57a and 57b constituting the cutting blade of the gate cutting means 9 are supported so as to move in a direction approaching and separating from each other. The gate cutting blades 57a and 57b are heated by respective heating members (not shown) and cut the gate while softening the gate 15c of the resin molded product 15. For gate cutting while heating the gate cutting blades 57a and 57b, the gate cutting surface is required to be gate-cut with high accuracy. For example, this is suitable for gate cutting of a light guide plate made of synthetic resin. In the invention, heating is not an essential requirement, and can naturally be applied to gate cutting of various resin molded products other than the synthetic resin light guide plate.
[0023]
A pilot pin 60a is provided at the lower end of the mounting frame 58a of the gate cutting blade 57a positioned above, and a pilot hole 60b into which the pilot pin 60a is inserted is mounted above the mounting frame 58b of the gate cutting blade 57b positioned below. Then, the gate cutting blades 57a and 57b which are close to each other at the time of gate cutting are positioned.
[0024]
The drive members that drive the gate cutting blades 57a and 57b up and down may be fluid pressure members (not shown) such as cams, servo motors, or cylinders connected to an electric motor.
[0025]
A product fixing means 7 is provided on the main body frame 13 on the opposite side of the molded product holding means 5 with the gate cutting part 9 interposed therebetween. The product fixing means 7 is supported on the mounting plate 58 fixed to the main body frame 13 so as to move in the left-right direction (the direction toward the molded product holding portion 5), and the first movable body 59. A second movable body 61 that is supported so as to move in the left-right direction at a position corresponding to each product 15a on the body 59, and a front-rear direction with respect to the second movable body 61 (parallel to the gate cutting blades 57a and 57b). Each pair of gripping claws 63a and 63b provided to be openable and closable.
[0026]
Positioning stoppers 65 are respectively attached to the first movable body 59 corresponding to the pair of gripping claws 63a and 63b, and are positioned by contacting the product 15a gripped by the gripping claws 63a and 63b.
[0027]
The first and second movable bodies 59 and 61 are reciprocated independently in the respective directions by driving members (not shown) such as an air motor and an air cylinder. The pair of gripping claws 63a and 63b are respectively moved in a direction toward and away from each other by a driving member 64 such as an air motor or an air cylinder so that the product 15a can be gripped. Further, stoppers 59a and 61a for adjusting the stroke are provided on the respective side portions of the first and second movable bodies 59 and 61, and the stoppers 59a and 61a come into contact with the adjusting members 67 and 68 provided on the main body frame 13. The width can be made variable so that the amount of movement in the left-right direction can be adjusted according to the size of the product 15a.
[0028]
Next, the gate cutting action of the container 17 by the molded product gate cutting apparatus 1 will be described.
First, the left and right traveling bodies 25 and the front and rear traveling bodies 29 are controlled to move and the chuck 33 is moved above the resin molded product 15 at a predetermined position in the container 17 loaded by the loading device 19, and then the lifting arm 31 is controlled to descend. Then, the suction member 33b of the chuck 33 is brought into contact with and held by the product 15a of the resin molded product 15.
[0029]
Next, the lift arm 31 is lifted and the resin molded product 15 is taken out from the container 17, and then the left and right traveling bodies 25 and the front and rear traveling bodies 29 are moved and controlled as shown in FIG. After being positioned above the holding means 5, the runner 15 b of the resin molded product 15 that is held by lowering the lifting arm 31 is transferred to the runner holding member 53. At that time, the runner 15b is locked and held in the locking groove 53a of the runner holding member 53, thereby restricting misalignment and positioning the product 15a on the product holding member 49a. As shown in FIG. 10, the product 15a on the product holding member 49a is damaged by being lifted upward by the compressed air sprayed from the communication support 49b provided on the product holding member 49a and kept in a non-contact state. Is prevented.
[0030]
As shown in FIG. 11, after the first movable body 59 is moved to the gate cutting means 9 side in the above state, the left and right slider 37 is moved to the gate cutting portion 9 side, and the product 15a on each product holding member 49a is moved to the first position. The first movable body 59 is brought into contact with the stopper 65. At this time, the gate 15c which is the boundary between the product 15a of the resin molded product 15 and the runner 15b is positioned between the gate cutting blades 57a and 57b.
[0031]
Next, as shown in FIG. 12, in the above state, the second movable body 61 is controlled to move, and the gripping claws 63a and 63b are moved toward the product 15a to grip and fix the product 15a. When the gate cutting blades 57a and 57b are moved toward each other in this state, the gate 15c of the resin molded product 15 is gate-cut by the gate cutting blades 57a and 57b that are close to each other. At that time, the gate cutting blade 57b positioned below enters the gap of the runner holding member 53 in the support frame 47 and is positioned below the gate 15c to enable gate cutting.
[0032]
During the gate cutting described above, the stress generated in the gate 15c due to the biting of the gate cutting blades 57a and 57b with respect to the gate 15c becomes the cutting resistance with respect to the gate cutting blades 57a and 57b. The member 53 absorbs stress by elastically deforming the elastic member 55. That is, as shown in FIG. 13, the runner holding member 53 is supported so as to move in the axial direction with respect to the support shaft 51, and is always intermediate in the axial direction by the elastic members 55 located on both sides of the support shaft 51. It is urged to be located in. For this reason, it absorbs by moving the runner holding member 53 by the stress which generate | occur | produces in the gate 15c at the time of gate cutting, and compressing the elastic member 55. FIG.
[0033]
Further, at the time of gate cutting by the gate cutting blades 57a and 57b, as shown in FIG. 14, the first movable body 59 is moved backward at the start or halfway of the gate cutting by the gate cutting blades 57a and 57b to hold the product 15a. The gripping claws 63a and 63b are moved away from the gate cutting blades 57a and 57b, and the product 15a is reliably separated from the runner 15b.
[0034]
After the gate cutting described above, as shown in FIG. 15, the gate cutting blades 57a and 57b are moved away from each other, and then the first and second movable bodies 59 and 61 are advanced to be held by the holding claws 63a and 63b. The product 15a is moved onto the product holding member 49a. In this state, the product 15a is released from the holding claws 63a and 63b and transferred onto the product holding member 49a.
[0035]
At this time, as shown in FIG. 16, the communication support body 49b of the product holding member 49a on which the product 15a whose gate has been cut is placed is switched to intake air so that the product 15a is adsorbed. This prevents the product 15a from falling from the product holding member 49a. In addition, the product 15a which is located on the product holding member 49a opposite to the product holding member 49a on which the product 15a is placed and is not gate-cut is slightly lifted by the air jetted from the communication support 49b and is in a non-contact state. To be kept.
[0036]
Next, after the rotating member 45 is driven to rotate the molded product holding part 5 by 180 ° to rotate the product 15a which is not gate-cut to the gate cutting blades 57a and 57b, the same as described above. The gate is cut to separate the product 15a from the runner 15b.
[0037]
When each product 15a that has been gate-cut is transferred onto each product holding member 49a, the left and right traveling bodies 25 and the front and rear traveling bodies 29 are controlled to move so that the chuck 33 is positioned above the molded product holding means 5. After that, as shown in FIG. 17, the lifting arm 31 is controlled to move downward to hold the products 15a gate-cut into the suction members 33a, and the runner holding members 33b hold the runners 15b separated from the products 15a.
[0038]
Next, the left and right traveling bodies 25 and the front and rear traveling bodies 29 are respectively moved and controlled so that the chuck 33 is positioned on a runner discharge member 24 such as a shooter provided in front of the carry-out device 23, and then the runner 15b by the runner holding member 33b. Release the hold and drain. After the above operation, the left and right traveling bodies 25 and the front and rear traveling bodies 29 are controlled again to position the chuck 33 on the carry-out device 23, and then the holding of the product 15a by the suction member 33a is released and accommodated in the container 21. .
[0039]
In the present embodiment, the stress generated when the gate of the product 15a is cut is absorbed by moving the runner holding member 53 by the stress and elastically deforming the elastic member 55, thereby reducing the cutting resistance due to the stress. 15c can be cut with high quality.
[0040]
Further, before the resin molded product 15 is gate-cut, the product 15a placed on the product holding member 49a is held in a non-contact state to prevent damage, while the product 15a that has been gate-cut is held. In this case, the product 15a can be adsorbed to prevent the product 15a from dropping due to a positional shift.
[0041]
The present invention can be modified as follows.
1. In the above description, the molded product gate cutting device suitable for manufacturing the synthetic resin light guide plate is described as an example. However, the resin molded product gate-cut by the present invention is not limited to the synthetic resin light guide plate. Of course, any technical matter that absorbs the stress generated by the gate cutting by elastic deformation of the elastic member when the gate is cut by the gate cutting blade in a state where the product is fixed is included in the technical matter of the present invention. included.
[0042]
2. The above description is based on the timing when the gate is cut when the gate is cut while the product is sandwiched and fixed by the gripping claws 63a and 63b with the gate 15c positioned between the gate cutting blades 57a and 57b that are close to each other. Although the gate cutting method has been described in which the gripping claw is retracted to reliably separate the product from the runner, the gate may be cut as follows.
[0043]
A. Similarly to the above, the product 15a is held by the gripping claws 63a and 63b in a state where the molded product holding means 5 is moved to the gate cutting blades 57a and 57b and the product 15a is pressed and positioned against the stopper 65.
[0044]
I. As shown in FIG. 18, the gripping claws 63a and 63b are retracted and the product 15a is pulled out to the gate cutting blades 57a and 57b to be positioned on the gate 15c. At this time, the runner holding member 53 moves toward the gate cutting blades 57a and 57b and elastically deforms one elastic member 55.
[0045]
C. In this state, the gate cutting blades 57a and 57b are operated to cut the gate. At this time, as shown in FIG. 19, the runner 15b is urged to the opposite side of the gate cutting blades 57a and 57b by the elastic force of the elastic member 55 with respect to the product 15a, so that the gate 15c is generated along with the gate cutting. Stress can be absorbed. When the gate cutting is completed, the runner can be separated from the product 15a held by the gripping claws 63a and 63b by the elastic force of the elastic member 55 as shown in FIG.
[0046]
D. As shown in FIG. 21, after the gate cutting blades 57a and 57b are separated, the gripping claws 63a and 63b holding the product 15a are advanced and positioned on the product holding member 49a, and then the gripping of the gripping claws 63a and 63b is released. The product 15a is transferred.
[0047]
3. In the above description, the resin molded product accommodated in the container by the molded product supply / unload means 3 is sequentially supplied to the molded product holding means 5 and gate-cut, and then only the product is accommodated in another container and unloaded. However, after the resin molded product taken out from the resin molding machine by the molded product take-out machine is directly transferred to the molded product holding means 5 and gate-cut, the product is separated by being gate-cut by the molded-product supply and delivery means May be accommodated in a container.
[0048]
【The invention's effect】
The present invention can increase the accuracy of the gate cut surface in the product by escaping the stress generated during the gate cutting of the resin molded product. In addition, the gate of the resin molded product can be efficiently cut with high positional accuracy. Furthermore, the resin molded product and the runner can be reliably cut.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a molded product gate cutting device.
FIG. 2 is a partially broken schematic perspective view showing a chuck in a resin molded product supply / unload means.
FIG. 3 is a perspective view showing a molded product holding means.
4 is a partially cutaway side view of the molded product holding means as seen from the direction of arrow A in FIG. 3. FIG.
5 is a longitudinal sectional view taken along line BB in FIG. 3. FIG.
FIG. 6 is a schematic perspective view showing product fixing means.
7 is a side view of FIG. 6. FIG.
FIG. 8 is a schematic perspective view showing a gate cutting means.
FIG. 9 is a plan view showing a state of holding a resin molded product in the molded product holding means.
FIG. 10 is a cross-sectional explanatory view showing a product holding action by the product holding member.
FIG. 11 is a plan view showing the positioning action of the product.
FIG. 12 is a plan view showing a gripping action of a product.
FIG. 13 is a schematic side view showing an absorption action of stress generated at the time of gate cutting.
FIG. 14 is a schematic side view showing a separating action at the time of gate cutting.
FIG. 15 is an explanatory diagram showing a product transfer operation with respect to the product holding member;
FIG. 16 is an explanatory view showing a product adsorption action by the product holding member.
FIG. 17 is an explanatory view showing the holding action of the product and the runner by the chuck.
FIG. 18 is an explanatory view showing a pulling-out action of a product.
FIG. 19 is an explanatory view showing a stress absorbing action at the time of gate cutting.
FIG. 20 is an explanatory view showing a product separating action.
FIG. 21 is an explanatory diagram showing a product transfer operation with respect to the product holding member.
[Explanation of symbols]
1-molded product gate cutting device, 5-molded product holding means, 7-product fixing means, 9-gate cutting means, 15-resin molded product, 15a-product, 15b-runner, 15c-gate, 55-elastic member

Claims (6)

Molded product holding means provided with a runner holding member for holding the runner of the resin molded product and a product holding member for holding the product of the resin molded product on the support frame ;
A pair of cutting blades for moving and cutting the gate of the resin molded product held by the molded product holding means in a direction in which the blade edges approach each other and in a direction in which they are separated from each other ;
A product fixing means for grasping a product of a resin molded product held by the molded product holding means and regulating positional deviation;
In the molded product gate cutting device with
The runner holding member is supported so as to be movable toward and away from the cutting frame with respect to the support frame , and is urged so that it is always positioned at the neutral position by the elastic force of the elastic member , and stress generated when the gate is cut. A molded product gate cutting device which can absorb stress by moving by elastic deformation of the elastic member. The molded product holding means according to claim 1 is provided with a molded product gate cutting device movably provided between a cutting position enabling gate cutting relative to the pair of cutting blades and a non-cutting position spaced apart from the pair of cutting blades. . The runner holding member according to claim 1 is a molded product gate cutting device provided with a groove portion for locking and holding the runner. 2. The molded product gate cutting device according to claim 1, wherein the elastic member comprises a compression spring or a rubber body. The support frame of the molded product holding means according to claim 1 has a product holding member on both sides and is provided so as to rotate with respect to the cutting blade, and is held by the product holding member on each side by the rotation of the support frame. Molded product gate cutting device that places the finished product between the cutting blades. The cutting blade according to claim 1, wherein the heating member can be heated to a desired temperature and the gate is cut while the gate is heated and softened .

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