JPS61209813A - Press cutting mechanism for wire connecting tool for clip terminal - Google Patents

Abstract

PURPOSE:To securely carry out connection to a clip terminal and prevent the wear of a cutter by normally making said cutter retracted from the wire pressing surface of a pressing member and making said cutter advance when the pressing amount of said pressing member has reached a certain amount. CONSTITUTION:In a clip terminal connecting tool 1, the bit 7 of a cutter 3 is normally retracted behind a wire holding groove 6 which serves as a wire pressing surface, and a wire (c) is fitted in the wire holding grooves 6, 6 while being applied to the U-groove a' of a clip terminal (a), and a pressing condition is set. Under this condition, the wire (c) is held straight in the axial direction in the horizontally provided wire holding grooves 6, 6, and, when the pressing amount of a pressing member 2 reaches a certain amount breaking a wire cover in the U-groove a' and connecting the wire (c) to the clip terminal (a), the tip 7 of the cutter 3 advances to cut the excess length of wire c' between the tip 7 and an insulated base (b). Thereby, connection to a clip terminal can be securely carried out while enabling the use of cutter without wear for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tool for connecting electric wires to clip terminals used for in-house wiring of, for example, electronic button telephones.

(Prior Art) Tools for easily and quickly connecting a plurality of electric wires to a U-shaped clip-shaped terminal are widely used for in-plant wiring of various electronic devices 1, such as electronic button telephones. This tool has the function of pushing the wire into the clip terminal, breaking the sheath at the U-shaped connection part to establish an electrical connection, and cutting off the unnecessary part of the wire once the connection is complete.

As a conventional tool of this kind, Utility Model Publication No. 52-53877,
No. 53-14938, No. 55-43HO, No. 59-
No. 20788 etc. have been proposed. These tools all include a pusher for pressing the electric wire into the U-shaped connection part,
A cutter that cuts the entire length of the wire by pressing it against the insulating base of the clip terminal is fixed in parallel. Among the above tools, Jikosho 5
No. 9-20788 includes a guide plate having a wide recess on the end surface between the presser and the cutter.

Although this guide plate is configured to be able to be pressed and retreated, the presser and cutter are fixed.

In any case, the cutter blade of each of the above-mentioned tools protrudes beyond the presser, and this state is illustrated in FIG. 7 of the drawings. That is, the presser d and the cutter e are arranged side by side and fixed in position, and the extra length C of the electric wire C.

The cutting edge e of the cutter e is lower than the pressing end surface d° of the presser d because it can be cut by pressing it against the insulating base of the clip terminal a.
' must be protruded, and the amount of protrusion is set to be at least larger than the diameter of the electric wire.

When connecting the wire C, press the wire into the U-shaped groove a of the terminal a using both the presser d and the cutter e, and after the wire C contacts the terminal base and the connection is completed, move the cutter further forward. to cut the wire.

(Problem to be solved by the invention) According to the above structure, the cutter blade edge e' is the pressing end surface d.

Since the mechanism protrudes further than the cutter, there is a drawback that the cutter edge e° must be used for pressing. As a result, firstly, as shown in Fig. 7 (A) and (B), the electric 11i IC was bent in the axial direction by the amount of protrusion of the cutter blade edge e°, so that it could not be connected in a straight line in the axial direction. . Second, since the electric wire is press-fitted into the U-shaped groove a° while being bent, the pressing force against the U-shaped groove a' becomes large, resulting in severe fatigue during the pressing operation.

Thirdly, the cutter edge e' is subject to severe wear because most of the pressing force has to be applied in the negative direction, so that it is constantly required to be replaced.

Further, as shown in FIG. 7(D), the wire may be cut with a sufficient margin in consideration of the deterioration of the mechanical properties of the extra length C'. In this case, a gap f is formed between the pusher d of the wire C and the cutter e to maintain a cutting margin of extra length C°, so if the press-fitting load is large, the wire C will be press-fitted into the U-shaped groove a′. There was an accident in which the electric wire C entered the gap f without opening, resulting in a poor connection.

The present invention was developed in view of the above-mentioned circumstances, and an object of the present invention is to enable reliable connection to the clip terminal and to enable long-term use of the cutter without wear.

(Means for Solving the Problems) The electric wire connecting tool for clip terminals according to the present invention to achieve the above object is characterized by a pusher for press-connecting an electric wire to a clip terminal having a substantially U-shape, and In a connection tool that is equipped with a cutter that is placed in parallel with the wire and presses the wire length against the insulating base of the clip terminal to cut it, the cutter is usually set back from the wire pressing surface of the pusher so that the pusher is pushed in at a constant rate. The pressure cutting mechanism is configured such that the cutter moves forward when the cutter reaches the end.

(Operation of the invention) When connecting electric wires by pressing, the cutter is always set back from the wire pressing surface of the pusher, so the wire is not pressed through the cutter and the wire is connected to the pressing surface. It is held in a straight line in the axial direction and pressed. When the pressing force of the presser reaches a certain amount and the electric wire is connected to the clip terminal, the cutter moves forward and cuts the extra length of the electric wire between it and the insulating base.

(Embodiment of the Invention) Figures 1 to 4 show an embodiment of the press-cutting mechanism of the wire connection tool for clip terminals according to the present invention, and Figure 1 shows a partially cutaway view of the main part of the mechanism. FIG. 2 is a sectional view showing the state before pressing, FIG. 3 is a sectional view showing the pressing process, FIG. 4 is a sectional view showing the cutting state, and FIGS. The figure is a sectional view showing an embodiment of a wire connecting tool for clip terminals embodying a press cutting mechanism.

The clip terminal connection tool 1 includes a presser 2 and a cutter 3 arranged in parallel so that they can move forward and backward. The presser 2 has pressing pieces 5, 5 protruding through the terminal allowing groove 4, and the pressing pieces 5, 5 are provided horizontally with wire holding grooves 6, B, which serve as wire pressing surfaces, respectively. Further, since the cutting edge 7 of the cutter 3 is normally set back from the wire pressing surface of the pusher, it is installed flush with or set back from the groove surface of the wire holding groove 8.8.

According to the above-mentioned electric wire connection tool l for clip terminals, while applying the electric wire C to the υ-shaped groove a° of the clip terminal d, the electric wire C is placed in the electric wire holding groove 8.8 in the axial direction and the pressure is set. . In this state, the electric wire C is held linearly in the axial direction by the horizontally provided electric wire holding groove 8.6. Since the wire is pressed by the pair of wire holding grooves 6, 6,
Even if there is pressing resistance to the U-shaped groove a°, it is pressed substantially horizontally. When the pressure of the pusher 2 reaches a certain amount, the wire coating becomes U.
When the electric wire is torn at the groove a° and connected to the clip terminal a, the cutting edge 7 of the cutter e moves forward and cuts the wire by an extra length C° between it and the insulating base.

According to the above-mentioned mechanism, since the clip terminal a is pressed horizontally by the wire holding grooves 6, 6 from both sides, the wire can be pressed and connected in a horizontal state, and a mechanism that can achieve a reliable connection can be provided.

The presser 2 and cutter 3 in the press cutting mechanism of the wire connecting tool for clip terminals will be described in more detail with reference to FIGS. 5 and 6.

A guide member 12 inside the grippable elongated housing 11 houses a pusher 2 that is biased forward by an action member 13, and an impact member biased forward by a spring 14 at the rear thereof. 15 is housed within the guide member 12 in a regulated state by a shoulder portion 18. The operating member 13 is inserted through the coil spring 17 and is positioned in an inclined manner with its eccentric reduced diameter portion 17a, so that it is pressed into contact with the expanded diameter portion 18 of the pusher 2. Further, the impact member 17
A through hole 18 is bored along the axis of the. moreover,
The cutter 3 is fixed to a guide member 12.

At the time of connection, when the housing 1 is pressed toward the insulating base, the wire C is inserted into the U-shaped groove a° with the sheath cut open. As a reaction to this, the presser 2 to the action member 1
3 retreats against the biasing force of the coil spring 17, and the impact member 15 also retreats against the spring 14. When the housing 1 is further pressed toward the insulating base, the posture of the circumferential side portion 13a of the first action member 13 is corrected by the inclined wall surface 18a of the shoulder portion IB of the guide member 12, so that the push shaft 13b of the action member 13 is corrected.
is aligned with the through hole 19 of the impact member 15. As a result, when the impact member 15 is released from the restraint of the action member 13, it moves forward at once due to the elastic force of the spring 14 and collides with the shoulder lB, and the impact impact at this time causes the cutting edge 7 of the cutter 3 to Cut the extra length C° of the wire that is in contact with the wire.

Although not shown, another pressing cutting mechanism of the wire connecting tool for clip terminals can be designed such that the rear part of the presser 2 is urged by a spring, and the cutter 3 moves forward as the presser 2 is pushed. .

Furthermore, although a pair of wire holding grooves B and B have been illustrated and described, it is also possible to design a structure in which a wire pushing piece is disposed between them at the same position as the groove surface.

As explained above, the present invention provides the following effects.

(a) The wire can be pushed linearly in the axial direction with the wire pressing surface of the pusher without applying a cutter to the wire, and a reliable connection can be obtained almost orthogonally to the clip terminal. Since the cutter does not touch the wire, it can be pushed in smoothly and the life of the cutter can be extended.

(b) Since the cutter is configured to move forward when the push reaches a certain amount, the cutting operation can be performed after recognizing that the push-in connection has been completed, and can be performed in a series of operations.

[Brief explanation of drawings]

1 to 4 show an embodiment of the press cutting mechanism of the wire connection tool for clip terminals according to the present invention, FIG. 1 is a partially cutaway perspective view of the main part of the mechanism, and FIG. The figures are the same sectional view showing the state before pressing, FIG. 3 is the same sectional view showing the pressing process, FIG. 4 is the same sectional view showing the cutting state, and FIGS. 5 and 85! J is a sectional view showing an embodiment of a wire connecting tool for clip terminals embodying a press cutting mechanism, FIG. 7(A)
CB) (C) CD) are cross-sectional views showing a conventional press cutting state. l 0. Wire connection tool for clip terminals. 20. Presser, 31. Cutter, 60. Wire holding groove, 11
．． , Housing, 120. Guide member, 13. . Acting member, 15. , impact member, do, clip terminal, b
8. Insulated base, C9, electric wire, Utility model registration applicant 01 Hakusan Seisakusho Co., Ltd. Agent Patent attorney 9. Yoshiharu Yoshida Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 (A) (B) (C) (0)

Claims (1)

[Scope of Claims] A pusher for press-connecting an electric wire to a substantially U-shaped clip terminal, and a cutter installed in parallel with the pusher for pressing and cutting the extra length of the electric wire against an insulating base of the clip terminal. A press cutting mechanism for a wire connecting tool for clip terminals, wherein the cutter is normally retracted from the wire pressing surface of the presser and moves forward when the presser reaches a certain amount of pushing.