JPH0541748U - Nippers for cutting injection molded products - Google Patents

Abstract

(57) [Summary] [Purpose] Even for a molded product in which the gate is formed across two sides of the product, the product and runner are separated by one cutting operation. [Structure] The cutting blades 2, 2 provided on the cutting edge portion 4 of the nipper body 1 have horizontal blades 7 in the same direction as the nipper body 1,
7 and vertical blades 8 and 8 provided continuously from the rear end positions of the horizontal blades 7 and 7 at right angles to the horizontal blades, respectively, to form compound blades 9 and 9. Therefore, the plane P on the gate side of the molded product T
_The horizontal blades 7 and 7 and vertical blades 8 and 8 respectively cut the gates G ₁ and G ₂ formed in ₁ and P ₂ to separate the product T ₃ from the runner T _{1 in one} cutting operation. Is possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nipper used in a gate cutting process of an injection molded product.

[0002]

[Prior Art]

Molded articles T that is formed by injection molding machine, runner T ₁ to the product T ₃ as shown in FIG. 1 (a), taken out sprue T ₂ together form, product T ₃ and runners by cutting step after molding T ₁ is the position of the gate G at the time of molding and is cut along the blade of the nipper 1a along the plane P ₁ on the gate side of the product.

[0003]

[Problems to be solved by the device]

 In the conventional gate cutting process, the gate G is the product T₃ Gate side plane P ₁ There is no problem with cutting once if it is located in the central part of the product, but especially in the injection molding process, the gate should be installed in one place as shown in Fig. 1 (a) in consideration of the pouring of raw materials. (The corresponding surface of the product is P₁ (1 surface of P)₁ , P₂ Gate G across two sides₁ , G₂ Some of the molded products have runners T as shown in Fig. 1 (b).₁ Will be formed. Therefore, in such a molded product T, the gate cut using the nipper 1a having only the above-mentioned pair of linear cutting blades cannot finish the gate cutting in one cutting process, and the plane P₁ , P₂ Since each product must be cut twice, it takes time to gate-cut each product, resulting in reduced workability.

[0004]

[Means for Solving the Problems]

 Therefore, the present invention provides a molded product cutting niper that can perform gate cutting in one cutting process even if the gate position in the product is across two surfaces as described above. , Its construction is an injection molded product cutting nipper that performs gate cutting of a molded product in which a gate connecting a runner and a product is formed across two surfaces of the product, while the gate is formed. A first cutting blade that performs a gate cut along the surface of the first cutting blade, and a second cutting blade that is formed continuously with the first cutting blade and performs a gate cut simultaneously with the first cutting blade along the other surface where the gate is formed. It is characterized by having a compound blade composed of a cutting blade.

[0005]

[Action]

 When the compound blade is closed by sandwiching the runner of the molded product formed by the gate straddling two surfaces, the first cutting blade and the second cutting blade cut the gate on each surface at once, and once. The product and runner can be separated in the cutting process.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 is a nipper body, which is provided at a cutting position A in a gate cutting device that separates a sprue and a runner from a molded product taken out from an injection molding machine. 3 is used as a fulcrum, and the blade edge portion 4 thereof is axially attached so as to project toward the front of the nipper body. Behind the rear end portions 5 and 5 on the power point side of the cutting blades 2 and 2, a pusher body 6 having taper portions 6a and 6a is provided in association with a hydraulic cylinder (not shown) inside the main body 1. There is. The cutting edge 2, which is formed by the cutting blades 2 and 2, has horizontal blades 7 and 7 in the same direction as the nipper body 1 and continuous from the rear end positions of the horizontal blades 7 and 7 in a direction perpendicular to the horizontal blades. It has vertical blades 8 and 8 provided, respectively, and forms compound blades 9 and 9.

In the injection-molded product cutting nipper configured as described above, the molded product T taken out from the injection molding machine is first received by the gripping means such as the chuck 10 in FIG. 3, and is conveyed to the cutting position A as it is. To be done. The chuck 10 gripping the molded product T changes the direction of the molded product T to an appropriate cutting posture at a position before the cutting position A, stops at the cutting position A, and stops at the cutting position A, and the composite blades 9 and 9 of the nipper main body 1 receive the gate G. Abut. Then, in the nipper 1, when the hydraulic cylinder operates, the pusher body 6 advances in the direction of the cutting edge portion 4 in conjunction with it, and the taper portions 6a, 6a also move forward at the same time. When the taper portions 6a and 6a come into contact with the rear end portions 5 and 5, the rear end portions 5 and 5 are narrowed while being pressed by the taper portions 6a and 6a, and the cutting blades 2 and 2 having the center pin 3 as a fulcrum are also closed. However, the stopper 5a completes the closing operation of the rear end portions 5 and 5, and the gate is cut at the gate G position. (4) In this case the composite blade 9, 9, the horizontal blades 7, 7 a gate G ₁ along the plane P ₁ of the product T ₃ side, the vertical blades 8,8 gate G ₂ along a plane P ₂ Since each of them is simultaneously cut (FIG. 5), the gate cutting can be performed in two directions by closing the cutting blades 2, 2 once. When the above cutting is completed, the pusher body 6 and the taper portions 6a, 6a are also retracted by the operation of the hydraulic cylinder to return to the position shown in FIG. 3, and the cutting blades 2, 2 closed by the taper portions 6a, 6a are moved to the rear end. It is released by the urging force of a spring (not shown) provided between the parts 5 and 5, and the cutting operation is completed.

In the above-described embodiment, the two-direction compound blades 9 and 9 are formed at right angles, but the angle formed by the compound blades 9 and 9 is not limited to the above-described embodiment. The compound blade can be arbitrarily set to an acute angle or an obtuse angle according to the shape of the gate of the molded product. Further, each compound blade is not limited to a straight blade, but may be two compound blades formed in a curved shape, or a compound blade consisting of a straight blade and a curved blade, both of which are the shape of the product and the gate. The shape of the compound blade may be appropriately changed according to the above.

Further, the nippers in the above-described embodiments are described as those in which the cutting blades 2 and 2 and the cutting edge portion 4 having the compound blades 9 and 9 are integrally formed and pivotally attached to the nipper body 1. For example, in the cutting edge portion, a compound blade in which the angle of the vertical blade can be changed with respect to the fixed horizontal blade, or the cutting edge portion 4 is configured to be attachable to and detachable from the cutting blades 2 and 2, respectively. The design can be arbitrarily changed within the range not departing from the constitution of the present invention, for example, by allowing the cutting edge portion having the compound blades of different angles to be attached as an attachment according to the gate shape of the molded product.

[0010]

[Effect of the device]

 As described above, according to the present invention, even if the gate position is a molded product extending over two planes of the product, the gate cutting can be completed with one cutting operation, which leads to an increase in the operation rate of the device. Can be shortened.

[Brief description of drawings]

FIG. 1 (a) is an explanatory view showing a molded product T in which a gate is formed only on one surface of the product. (B) In the molded product T, it is an explanatory view showing a molded product in which a gate is formed across two surfaces of the product.

FIG. 2 is an explanatory view showing an embodiment of a nipper for cutting an injection molded product according to the present invention.

FIG. 3 is an explanatory diagram showing a state in which the nippers perform gate cutting of a molded product in the above-described embodiment.

FIG. 4 is an explanatory diagram showing a state in which the nippers perform gate cutting of a molded product in the above embodiment.

FIG. 5 is an explanatory view showing a state in which the compound blade performs gate cutting of a molded product in the above-mentioned embodiment. (The cutting blade 2 on the front side is omitted)

[Explanation of symbols]

1 ... Nipper body, 2, 2 ... Cutting blade, 3 ... Center pin, 4 ... Blade tip 5, 5 ... Rear end, 6 ... Pusher, 6a, 6a ... Tapered portion, 7 , 7 ... Horizontal blade, 8,
8 ・ ・ Vertical blade, 9, 9 ・ ・ Compound blade, 10 ・ ・ Chuck,
T ・ ・ Molded product, T ₁・ ・ Runner, T ₂・ ・ Sprue,
T ₃ ··· Product, G · · Gate, P ₁ , P ₂ · · Gate side plane, A · · Cut position.

Claims (1)

[Scope of utility model registration request] 1. An injection molded product cutting nipper for cutting a gate of a molded product, wherein a gate connecting a runner and a product is formed across two surfaces of the product, wherein one of the gates is formed. A first cutting blade that performs gate cutting along a surface, and a second cutting blade that is formed continuously with the first cutting blade and that performs gate cutting simultaneously with the first cutting blade along the other surface where the gate is formed A nipper for cutting an injection-molded product, which has a compound blade composed of