JP3483294B2 - Gate member cutting device for resin molded products - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing unnecessary gate members formed when molding a resin molded product.
The present invention relates to a gate member cutting device for a resin molded product that cuts a gate member into small pieces. 2. Description of the Related Art As a conventional gate member cutting apparatus for a resin molded product, a pair of rotary blades are disposed in a box having an open upper portion, and the gate members are cut into small pieces by rotating the rotary blades. Known to do so. According to the prior art,
There is no problem while the gate member is large, but as the cutting progresses and the gate member becomes smaller, small pieces cut from the gate member scatter outside due to the impact at the time of cutting, foreign matter adheres to the small pieces and cannot be reused There was a problem that. [0004] Further, when the separating step of separating the gate member from the resin molded article, and then the cutting step of carrying the separated gate member into a cutting device and cutting it into small pieces, all are configured by an automatic machine such as an industrial robot. However, there is a problem in that the scattered small pieces may be mixed into a driving unit of an industrial robot or a peripheral device to cause malfunction. The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to cut a gate member without scattering cut small pieces to the outside, and Another object of the present invention is to provide an apparatus for cutting a gate member of a resin molded product, which can be reused without attaching foreign matter to small pieces. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a shaft member pivotally supported on an opposing side surface of a box having an open upper surface, and a box member provided on the shaft member. A lid member, a regulating member for regulating the rotation of the lid member, an arm member provided on the shaft member on the side opposite to the lid member, and a weight attached to the tip, and a detection for detecting a pivot end of the arm member Means, a cylinder having an engaging portion that engages with the arm member attached to the tip of a rod, and a pair of rotary blades provided inside the box body;
A control means for operating the cylinder and the rotary blade based on a detection signal of the detection means is provided. When the lid member closing the opening of the box is pressed from above by the tip of the gate member, the lid member pivots downward against the weight. On the other hand, the arm member rotates upward, and the rotation end of the arm member is detected by the detecting means. Then, the cylinder which has been retracted by the control means moves forward, and the engaging portion attached to the tip of the rod supports the arm member and maintains the open state of the lid member. Further, when the detecting means detects the rotation end of the arm member, the control means rotates the rotary blade for a predetermined time. Then, the gate member inserted into the box is cut into small pieces without being scattered from the tip to the outside of the box. After the cutting operation is completed, the cylinder is retracted by the control means, and the lid member is rotated by the weight until the lid member comes into contact with the regulating member to close the opening of the box. An embodiment of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a front view of the apparatus for cutting a gate member of a resin molded product according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a separating step of separating the gate member from the resin molded product. FIG. 4 is a schematic perspective view of a cutting step of cutting a gate member separated by a cutting device. In the apparatus 1 for cutting a gate member of a resin molded product, as shown in FIGS. 1 and 2, a box body 3 having an open upper surface is provided on a base 2, and opposing side surfaces of the box body 3 are arranged. 3
A shaft member 5 is rotatably supported at the upper corners of the shaft members a and 3b via a bearing 4, and a plate-like lid member 6 is fixed on the outer peripheral surface of the shaft member 5 in the axial direction so as to close the upper surface of the box 3. I have. Further, an arm member 7 is fixed to the outer peripheral surface of the shaft member 5 protruding outside the box body 3 on the side opposite to the lid member 6 so as to be substantially linear with the lid member 6, and a weight 8 is provided at the tip thereof. Is installed. Further, a stopper 9 for restricting the upward rotation of the lid member 6 is provided inside the side surface 3a, and the arm member 7
A limit switch 10 for detecting an upward rotation end of the cylinder 11 is mounted on the outside of the side surface 3b, and an engagement portion 11a for engaging with the arm member 7 is mounted on a tip of the rod 11b.
Are provided outside the side surface 3b. The first rotary blade 12 is provided inside the box 3.
And the second rotary blade 13 are provided. The first rotary blade 12 and the second rotary blade 13 are both formed by radially forming blade portions 12b, 13b on shaft members 12a, 13a. The first rotary blade 12 has one end of a shaft member 12a mounted on the inside of the side surface 3b via a bearing 14 and the other end coupled to a rotary shaft 15a of a motor 15 provided outside the side surface 3c (not shown). ). In addition, as the motor 15, an electric motor, a pneumatic motor,
Any of a hydraulic motor may be used. The second rotary blade 13 has one end of a shaft member 13a mounted on the inside of the side surface 3b via a bearing (not shown), and the other end engaged with a gear 16 fitted on a rotary shaft 15a of a motor 15 ( (Not shown). The two gears are both disposed between the side surface 3b and the side surface 3c. Further, the first rotary blade 12 and the second rotary blade 13
Are arranged such that the blade portions 12b and 13b overlap each other. However, when the motor 15 is operated, the blade portions 12b and 13b do not interfere with each other, and the first rotary blade 12 and the second rotary blade 13 face inward in the directions shown by arrows in FIG. Rotate. A discharge port 3 d is formed on the lower surface of the box 3, and communicates with a drop port 2 a formed on the base 2. Then, the small piece Ga of the cut gate member G falls onto a transport conveyor (not shown) under the floor via the discharge port 3d and the drop port 2a. Further, control means (not shown) for operating the cylinder 11 and the motor 15 based on the detection signal of the limit switch 10 is provided outside the box 3.
The control means includes a programmable controller (PC), a relay sequence circuit, and the like. Reference numerals 18a and 18b denote regulating plates provided above the first rotary blade 12 and the second rotary blade 13 for preventing the small pieces Ga from scattering. 19a and 19b guide the cut small pieces Ga to the discharge port 3d. The first rotary blade 12 and the second rotary blade 13
Is a guide plate disposed below the guide plate. The operation of the apparatus 1 for cutting a gate member of a resin molded product having the above-described structure will be described. Here, as shown in FIG. 3 and FIG. 4, the present invention is applied to a bumper W of a resin molded product mounted on an automobile. Then, the operation of separating the gate member G from the bumper W using the industrial robot R and the operation of gripping and transporting the separated gate member G and inserting it into the gate member cutting device 1 are performed. First, as shown in FIG. 1, a positioning jig 2 having an injection-molded bumper W provided on a gate cut table 20 is provided.
1, and both ends of the bumper W are pressed from inside by pressing pads 22 arranged on both sides of the gate cut table 20, and are positioned and fixed to the gate cut table 20. The pressing pad 22 is attached to the tip of a rod 23 a of a cylinder 23 provided on the gate cut table 20. With the bumper W positioned and fixed to the gate cutting table 20 by the forward movement of the cylinder 23, a cutter 24 attached to the end of the arm of the industrial robot R is provided with a substantially bar-shaped gate integrally formed with the bumper W. The member G is separated from the bumper W. The separated gate member G falls on the receiving portion 25 provided on the gate cut table 20. The gate member G that has fallen into the receiving portion 25 is the same industrial robot R
The end of the arm is gripped by the gripping claw 26 attached to the tip of the arm, and is conveyed to the gate member cutting device 1. Next, the industrial robot R has a gate member G
1 is substantially perpendicular to the lid member 6 which is in contact with the stopper 9 and closes the opening of the box body 3 as shown by the chain line in FIG. Further, when the end of the lid member 6 is pressed downward by the tip of the gate member G gripped by the industrial robot R, the lid member 6 pivots downward against the weight 8 as shown in FIG. The tip of the member G is inserted into the box 3. Then, the arm member 7 rotates upward and hits the limit switch 10. The detection signal of the limit switch 10 is input to the control means, and the cylinder 11 which has been retracted by the drive signal from the control means based on the detection signal.
Moves forward, the engaging portion 11a comes into contact with the arm member 7, and the open state of the lid member 6 is maintained. At that time, the industrial robot R
Releases the gripping claws 26 and throws the gate member G into the box 3. On the other hand, the motor 15 is started by the drive signal from the control means based on the detection signal, and the first rotary blade 12 and the second
The rotating blade 13 starts rotating, and the gate member G is cut into small pieces Ga sequentially from the tip. At this time, the lid member 6 prevents the small pieces Ga from scattering outside the box 3. The cut small piece Ga falls onto the conveyor below the floor via the discharge port 3d and the drop port 2a. Next, when a predetermined time elapses from the detection signal of the limit switch 10 and the gate member G is shortened, the cylinder 11 retreats according to a program preset in the control means. Then, the arm member 7 rotates downward by the weight of the weight 8, and the lid member 6 rotates upward and comes into contact with the stopper 9 to be closed. When a predetermined time has elapsed, the motor 15
Stops, the first rotary blade 12 and the second rotary blade 13 stop rotating, and the cutting operation of the gate member G ends. As described above, according to the present invention, the gate member is cut without scattering the cut small pieces to the outside, and the cut pieces are reused without attaching foreign matter to the small pieces. Can be done. Further, since the rotary blade is operated only when necessary, it is possible to contribute to energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an apparatus for cutting a gate member of a resin molded product according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view of a cutting step of cutting a gate member cut by a cutting apparatus. [Description of References] 1. A gate member cutting apparatus for a resin molded product, 3. a box body, 3
a, 3b: side surface of box, 5: shaft member, 6: lid member, 7 ...
Arm member, 8 ... weight, 9 ... stopper (restriction member), 10
... Limit switch (detection means), 11 ... Cylinder, 1
1a: engagement portion, 11b: rod, 12: first rotary blade (rotary blade), 13: second rotary blade (rotary blade), 15: motor,
G: gate member, Ga: small piece obtained by cutting the gate member, W
... Bumpers (resin molded products).

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29B 13/00-15/06 B29B 17/00-17/02

Claims (1)

(57) [Claim 1] A shaft member pivotally supported on opposing side surfaces of a box body having an open upper surface, a cover member of the box body provided on the shaft member, A regulating member for regulating the rotation, an arm member provided on the shaft member on the side opposite to the lid member and having a weight attached to a tip thereof, a detecting means for detecting a rotation end of the arm member, and an arm member. A cylinder having a mating engagement part attached to the rod tip, a pair of rotary blades provided inside the box, and control means for operating the cylinder and the rotary blade based on a detection signal of the detection means. A gate member cutting device for a resin molded product, comprising: