JP2009131933A - Gate cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of cutting a gate while always keeping a constant heating time with a simple structure. <P>SOLUTION: The gate cutting device is provided with: a liftable first cutting blade 7; a second cutting blade 21 fixed at a position confronting the cutting blade; a heater 8 for heating both the cutting blades; and a molded article support mechanism 14 for supporting a molded article with a runner. The molded article support mechanism consists of a molded article loading part 20c for liftably supporting the molded article, positioning parts 20a, 20b for positioning a gate of the molded article between both the cutting blades and a spring 18 for energizing the molded article loading part upward. On cutting the gate, the molded article loading part with the molded article loaded on it is moved down while resisting an energizing force. When the gate is cut off, the molded article with the runner cut off and the molded article loading part are moved away from the gate by lifting them together with the energizing force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gate cutting device for cutting a gate and separating a runner from a molded product for an injection molded product in which the runner is integrated with the molded product via a gate.

  Conventionally, a gate cutting device as shown in FIG. 5A is known as a device for cutting a gate of an injection-molded molded product (see, for example, Patent Document 1).

  The gate cutting device 50 has a frame 53 suspended from a fixing portion 51 via a spring 52, and a cutting actuator 54 such as an air cylinder is attached to the upper side of the frame 53. An upper cutting blade 55 with a built-in heater is attached to the tip.

  On the lower side of the frame 53, a lower cutting blade 57 that similarly incorporates a heater is mounted via a support rod 56.

  As shown in FIG. 5 (b), the cutting edge portions of both cutting blades 55 and 57 have one surface formed by inclined surfaces 55a and 57a, and the other surface formed by vertical contact surfaces 55b and 57b. ing.

  When the gate 58a of the molded product 58 is disposed between the upper cutting blade 55 and the lower cutting blade 57 and the rod of the actuator 54 is lowered to bring the upper cutting blade 55 into contact with the gate 58a, the reaction force causes the frame 53 to move. Along with this, the lower cutting blade 57 rises.

Thus, when both cutting blades 55 and 57 approach, the gate 58a is cut while being softened by heat.
JP-A-6-328525

  However, in the conventional gate cutting device described above, if the time for which the cutting blade heated by the heater is brought into contact with the gate 58a is too long, the molded product may be deformed.

  Therefore, in order to properly perform the cutting operation, it is necessary to control the contact time of the heated cutting blade. To realize this, the cutting operation of the gate cutting device must be controlled by some control device. However, there is a problem that the configuration of the gate cutting device becomes complicated.

  The present invention has been made in consideration of the problems in the conventional gate cutting device as described above, and provides a gate cutting device capable of cutting a gate with a simple configuration while always maintaining a constant heating time. To do.

The present invention includes a first cutting blade configured to be movable up and down, a lifting mechanism that lifts and lowers the first cutting blade, a second cutting blade fixed to a position facing the first cutting blade, and the first And a heating means for heating the second cutting blade, and a molded product support mechanism for supporting a molded product in which the runner is integrally molded through the gate,
The molded product support mechanism includes a molded product placement unit that supports the molded product to be movable up and down, and a positioning that is provided on the molded product placement unit and positions the gate between the first and second cutting blades. And an urging means for urging the molded product placement portion upward,
When lowering the first cutting blade and cutting the gate, both the molded product and the molded product mounting portion are resisted against the biasing force through the gate with which the first cutting blade comes into contact. Let down,
When the gate is cut by the first and second cutting blades coming into contact with each other, the molded product from which the runner is separated and the molded product placing part are both raised by a biasing force, A gate cutting device configured to be separated from a cutting position.

  In the present invention, a hand press can be used as the lifting mechanism, and the first cutting blade can be fixed to the lifting head.

  According to the present invention, the gate can be cut with a simple configuration while always maintaining a constant heating time.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 is a perspective view showing an external appearance of a gate cutting apparatus according to the present invention.

  In the figure, the gate cutting device 1 uses a hand press machine. The hand press machine includes a table 2, a main shaft 3 erected from the table 2, and a frame 4 fixed to the main shaft 3. And a head 6 that descends by operating a handle lever 5 provided on the frame 4 in the direction of arrow A. The hand press functions as an elevating mechanism that elevates and lowers an upper cutting blade 7 described later.

  The head 6 is provided with an upper cutting blade (first cutting blade) 7, and a heater (heating means) 8 for heating the cutting blade is attached to the upper cutting blade 7.

  The heater 8 is connected to a temperature controller (not shown), and the temperature controller is based on a temperature signal output from a thermocouple (not shown) attached to the upper cutting blade 7. No. 8 heating operation is ON / OFF controlled.

  The head 6 is fixed to the lower end of a drive shaft 9 penetrating the frame 4 in the vertical direction, and the drive shaft 9 is housed in a cylindrical portion 10 erected from the upper surface of the frame 4. A compression coil spring (hereinafter abbreviated as a spring) 11 is interposed in a gap between 9 and the cylindrical portion 10.

  The drive shaft 9 is provided with protrusions 12 and 12 (only the front side is shown) in the opposite direction (X direction) perpendicular to the drive shaft, and these protrusions 12 and 12 are the upper end of the spring 11. Since the protrusions 12 and 12 compress the spring 11 when the handle lever 5 is operated in the direction of arrow A, the upper cutting blade 7 descends in a state resisting the urging force of the spring 11. It will be. In the figure, reference numeral 10a denotes a long hole for guiding the elevation of the protrusions 12 and 12, and 13 denotes a stopper.

  On the table 2, a jig device 14 is mounted as a support mechanism for supporting a molded product in which a runner is integrally formed through a gate.

  The jig device 14 has a mounting plate 15 mounted on the table 2, and a lifting plate 17 is supported via four guide posts 16 erected from a position near the corner portion of the mounting plate 15. ing.

  Reference numeral 18 denotes a compression coil spring (biasing means, hereinafter abbreviated as a spring) provided between a sleeve 17a suspended from the elevating plate 17 and the mounting plate 15, and the elevating plate 17 faces upward when not cut. Is energized and kept to surface.

  Reference numeral 19 denotes a stopper. The stopper 19 is erected from the mounting plate 15 and has a shaft portion 19a penetrating a through hole provided in the elevating plate 17, and an engagement member formed at the upper end of the shaft portion 19a and having a diameter larger than the diameter of the through hole. It is comprised by the stop part 19b.

  The locking portion 19b is in contact with the upper surface of the elevating plate 17 that is levitated by the spring 18 and restricts its rising limit.

  The elevating plate 17 is provided with a molded product mounting table (molded product mounting unit) 20 for mounting a molded product (not shown) that has been injection molded.

  This molded product mounting table 20 has a U-shaped positioning portion 20a and a pair of L-shaped positioning portions 20b, 20b that abut against the edge of the molded product and restrain the movement on both sides in the Y direction. The molded product placing portion 20c is formed at a position one step lower than the upper surfaces of the positioning portions 20a and 20b, 20b.

  The opening B between the pair of positioning portions 20b and 20b is for placing a runner of a molded product set on the molded product mounting portion 20c.

  A pressing block 20d is fitted in the middle of the positioning portion 20a so as to be movable in the Y direction. The pressing block 20d is a molded product housed in the molded product mounting portion 20c by the urging force of the compression coil spring 20e. Is pressed against the pair of positioning portions 20b, 20b.

  The elevating plate 17 below the opening B is provided with a notch C, and a lower cutting blade 21 is erected in a state of passing through the notch C.

  As shown in the front view of FIG. 2, the lower cutting blade 21 is fixed to the cutting blade fixing portion 22 fixed to the mounting plate 15 with bolts 23.

  The upper cutting blade 7 and the lower cutting blade 21 are arranged so as to oppose each other in the vertical direction (Z direction), and the cutting edge portions of both the cutting blades 7 and 21 are opposite to one surface (on the side where the molded product is placed). Side surface) is formed of inclined surfaces 7a and 21a, and the other surface (surface on which the molded product is placed) is formed of vertical contact surfaces 7b and 21b.

  Moreover, as shown in FIG. 3, both the cutting blades 7 and 21 are formed in the strip | belt-plate shape which can pass the opening part B between a pair of positioning part 20b, 20b, and the width direction (X direction) ), The straight blade edges come into contact with each other.

  Next, the cutting operation of the gate cutting apparatus having the above configuration will be described with reference to FIG. In preparation for gate cutting, the upper cutting blade 7 and the lower cutting blade 21 are each heated to a predetermined temperature by a temperature controller.

  First, in FIG. 4A, the molded product F integrally formed with the runner Fa is disposed in the molded product mounting portion 20c formed in the recess. At this time, the pressing block 20d is moved backward in the direction of arrow G with a finger against the urging force of the compression coil spring 20e, and the molded product F is set in a state where the runner Fa projects from the opening B.

  The molded product F is fixed to the molded product mounting portion 20c by releasing the finger from the pressing block 20d.

  In this state, the handle lever 5 is tilted in the direction of arrow A (see FIG. 1), and the upper cutting blade 7 is lowered and brought into contact with the upper surface of the gate Fb of the molded product F as shown in FIG. When the molded product F is lifted from the molded product mounting portion 20c by the contact of the upper cutting blade 7, fingers are passed through the notches D and E and both sides of the molded product F are lightly pressed.

  Subsequently, when the handle lever 5 is tilted in the direction of arrow A, the molded product F is pushed downward by the pressing of the upper cutting blade 7, and the lifting plate 17 on which the molded product mounting table 20 on which the molded product F is placed is fixed, It is pushed down against the urging force of the spring 18 (see arrow H).

  Since the lower cutting blade 21 is fixed on the mounting plate 15, when the lifting plate 17 is lowered, the lower cutting blade 21 is relatively raised.

  Thus, the gate Fb of the molded product F is cut | disconnected by the upper side cutting blade 7 and the lower side cutting blade 21 contact | abutting.

  When the gate Fb is cut, the molded product F that has been pressed by the upper cutting blade 7 is released from the pressing, so that the lifting plate 17 is lifted by the urging force of the spring 18 (see arrow I), and FIG. Return to position a).

  At this time, since the operator operating the handle lever 5 loses the load and the handle lever 5 becomes lighter rapidly, the handle lever 5 may be returned at that timing. Therefore, even if it is not a skilled operator, a gate can be cut | disconnected, always maintaining fixed heating time.

  As shown in FIG. 4 (c), the molded product F with the gate Fb cut remains in the molded product mounting portion 20c. When the molded product F is taken out from the molded product mounting portion 20c, the gate cutting operation is completed. .

  The shapes of the positioning portion 20a, the pair of positioning portions 20b and 20b, and the molded product mounting portion 20c in the molded product mounting table 20 are changed as appropriate according to the molded product integrally formed with the runner to be cut. be able to. In other words, if a plurality of types of molded product mounting tables 20 having different shapes are prepared, the gate can be cut for a plurality of types of molded products with runners.

It is a perspective view which shows the external appearance of the gate cutting device which concerns on this invention. It is a front view of the gate cutting device shown in FIG. It is a right view of the gate cutting device shown in FIG. (a)-(c) is explanatory drawing which shows the cutting | disconnection operation | movement using the gate cutting device based on this invention. (a) is explanatory drawing which shows the structure of the conventional gate cutting device, (b) is the enlarged view which showed the shape of the cutting blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gate cutting device 2 Table 3 Spindle 4 Frame 5 Handle lever 6 Head 7 Upper cutting blade 8 Heater (heating means)
DESCRIPTION OF SYMBOLS 9 Drive shaft 10 Cylinder part 11 Spring 12 Protrusion 13 Stopper 14 Jig apparatus 15 Mounting plate 16 Guide post 17 Lifting plate 18 Spring 19 Stopper 20 Molded product mounting base 20a Positioning part 20b A pair of positioning part 20c Molded product mounting part 20d Press Block 21 Lower cutting blade 22 Cutting blade fixing part

Claims (2)

A first cutting blade configured to be movable up and down, an elevating mechanism for moving the first cutting blade up and down, a second cutting blade fixed at a position facing the first cutting blade, and the first and second cutting Heating means for heating the blade, and a molded product support mechanism for supporting a molded product in which the runner is integrally formed through the gate,
The molded product support mechanism includes a molded product placement unit that supports the molded product to be movable up and down, and a positioning that is provided on the molded product placement unit and positions the gate between the first and second cutting blades. And an urging means for urging the molded product placement portion upward,
When lowering the first cutting blade and cutting the gate, both the molded product and the molded product mounting portion are resisted against the biasing force through the gate with which the first cutting blade comes into contact. Let down,
When the gate is cut by the first and second cutting blades coming into contact with each other, the molded product from which the runner is separated and the molded product placing part are both raised by a biasing force, A gate cutting device configured to be separated from a cutting position.   The gate cutting device according to claim 1, wherein the lifting mechanism is constituted by a hand press, and the first cutting blade is fixed to the lifting head.