JPH0335785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a terminal crimping tool used for attaching and fixing a crimping terminal to a conducting wire.

2. Description of the Related Art Crimp terminals are used in wiring harnesses for control panels of machine tools and the like because of their high reliability and low resistance at the connection portion.

The crimp terminal described above, for example, the crimp terminal for screwing,
As shown in FIGS. 11 to 13, the covered electric wire 1
After inserting the conductive wire 2 between the claws 3 and 3 on one end side of the crimp terminal C, remove the claws 3 and 3 using a prescribed tool.
3 towards the conductor 2 and crimp it with strong pressure, and this conductor 2
electrically and mechanically connected.

The crimp terminal C for screwing, which is connected to the tip of the covered wire 1 as described above, is screwed to an appropriate electrical device, such as a motor, a limit switch, etc., using the washer part 4 on the other end side, and is electrically connected. , mechanically connected.

Problems to be Solved by the Invention Conventionally, when crimping and connecting the crimp terminal as described above to a covered electric wire, etc., a pliers-type manual terminal crimping tool or a tabletop terminal crimping tool using fluid pressure, etc., has been used. ing.

Generally, the pressing force required to crimp the above crimp terminal to a conductor is approximately 2 mm for a 2 mm diameter conductor.
The manual terminal crimping tool described above requires a gripping force of nearly 30 kg since the boost ratio is approximately 1:10.

By the way, in recent years, hundreds to thousands of crimp terminals are used in the control panels of machine tools, and it is very difficult to use manual terminal crimp tools such as those mentioned above in wiring work for such control panels. This requires a lot of effort and time, leading to a decrease in work efficiency. On the other hand, with the desk-top type terminal crimping tool, the above-mentioned labor is not a problem, but because it needs to receive driving force from a fluid pressure supply source, it cannot be easily carried like a manual terminal crimping tool. It is difficult to work in narrow and intricate spaces.

Conventionally, to improve the above points, for example,
A portable electric terminal crimping tool described in Japanese Patent Publication No. 42-19080 is known. However, in this crimping tool, the motor is controlled by only one trigger switch, and the motor is stopped by the operator releasing the pressure on the trigger switch, so the stop position of the transmission mechanism driven by the motor is is not constant, and the next operation starts with the die closed, making it impossible to set the crimp terminal.Unavoidably, the motor must be idle to set it, or the crimp terminal cannot be set more than once in a row. There is a problem or waste, such as the crimping operation being performed after

Means for Solving the Problems In order to solve the above problems, the present invention includes a fixed die, a movable die that reciprocates toward the fixed die, and converts the rotation of a motor into a reciprocating rocking motion. Further, in the electric terminal crimping tool equipped with a movable die drive device that converts the motion into one-way eccentric rotational motion and reciprocates the movable die via a toggle link mechanism using a swing lever mechanism, the electric power of the motor is The circuit is wired in parallel, and one of the wires has a first circuit that is turned on by pressing the trigger lever.
The normally open contact a ₁ of the switch is connected in series with the normally closed contact b ₁ of the second switch, which is turned off by the backward movement of the movable die of the swing lever mechanism, and the trigger lever is connected to the other side of the parallel wiring. The normally closed contact _A2 of the first switch turns ON when the pressure is released,
It is connected in series with the normally open contact _b2 of the second switch which is turned on by the backward movement of the movable die of the swing lever mechanism.

Operation When the trigger lever is pressed, the normally open contact _A1 of the first switch turns ON, and at this time, the normally closed contact _B1 of the second switch turns ON, so the motor rotates and swings back and forth. The motion is converted into a unidirectional eccentric rotational motion, and the swing lever mechanism causes the movable die to approach the fixed die via the toggle link mechanism, and the crimp terminal is strongly pressed between both dies to complete the crimp on the conductor. If you continue to press the trigger lever even after crimping is completed, the swing lever mechanism will move in the opposite direction.
The normally closed contact _b1 of the second switch is turned off, thereby automatically stopping the motor. After the motor has stopped and the trigger lever is released,
Each contact returns to its normal state. The state in which this motor is automatically stopped is exactly 1 of the unidirectional eccentric rotation movement part.
This corresponds to the rotation and is the position where the swing lever mechanism has made one reciprocation. Therefore, the next operation will be started from the same positional relationship as the previous one. In short, the first switch starts the motor, the second switch automatically stops the motor, and for each crimping operation, the movable die reciprocates once, and the drive device for that The system returns the positional relationship to the starting point and then stops.

Embodiment FIGS. 1 to 3 show an embodiment of an electric terminal crimping tool according to the present invention.

In the drawings, 10 and 11 are covers constituting the outer shell of the electric terminal crimping tool, 12 and 13 are chassis to which the drive device D of the electric terminal crimping tool is assembled, and 14 is fixed to the tips of the chassis 12 and 13. 15 is a movable die corresponding to the fixed die 14, 16 is a first crankshaft, 17 is a second crankshaft, and L is between the first crankshaft 16 and the second crankshaft 17. A swing link mechanism arranged in T
is a toggle link mechanism that converts the swing motion of the swing link mechanism L into a linear motion of the movable die 15 and doubles the transmission force from the swing link mechanism L;
M indicates a motor which is a driving source of the electric terminal crimping tool, and H indicates a handle grip formed at the lower part of the covers 10, 11.

The motor M is disposed outside one of the chassis 12 via a mounting base 18, and a pinion gear 20 is fixed to the tip of a motor shaft 19.

The first crankshaft 16 is rotatably supported between the chassis 12 and 13 via bearings 21 and 22, and a spur gear 23 that meshes with the pinion gear 20 is fixed to one end. The eccentric shaft portion 16a formed approximately at the center of the crankshaft 16 is connected to the chassis 12, 13.
The large-diameter end of a connecting rod 25 is rotatably connected to the connecting rod 25 via a bearing 24.

The second crankshaft 17 is supported by the chassis 12 via a first one-way clutch 26 so as to be rotatable in one direction.
The crankshaft 17 is supported by a ball bearing 27 through a ball bearing 27, and an eccentric shaft portion 17a formed at the end of the crankshaft 17 projects from the chassis 13. The large-diameter end of a link 29 is connected to the center of the crankshaft 17 via a second one-way clutch 28 so as to be rotatable in one direction with respect to the crankshaft 17. The small-diameter end of the connecting rod 25 is rotatably connected to the small-diameter end of the connecting rod 25 via a pin 30. A bearing 31 is fitted onto the eccentric shaft portion 17a of the crankshaft 17.

A shaft member 32 passing through the chassis 12 and 13 is disposed near the second crankshaft 17, and this shaft member 32 is connected to the chassis 12 and 13 by a key plate 33 fixed to the chassis 12. In contrast, it remains steadfast. A lever member 34 is rotatably fitted to a portion of the shaft member 32 protruding from the chassis 13 via a bush 35, and a first swing link 36 is fitted to a portion located between the chassis 12 and 13. The proximal end portions of the screws are fitted together via a bushing 37 so as to be able to swing freely.

The lever member 34 is formed with a U-shaped groove 34a that slides into contact with the bearing 31 fitted into the eccentric shaft portion 17a of the second crankshaft 17, and the side opposite to the U-shaped groove 34a is formed in the lever member 34. , a drive lever portion 3 protruding in the axial direction of the lever member 34;
4b and a switch operating piece 34c are formed.

The first swing link 36 has a toggle link mechanism T with a second swing link 40 swingably connected to the rear end of the movable die 15 by pins 38 and 39. A protruding shoulder portion 36a is formed near the base end of the first swing link 36, with which the drive lever portion 34b of the lever member 34 comes into contact. Further, a leaf spring 41 is fixed to the base end of the first swing link 36, and the leaf spring 41 has its tip connected to the chassis 12,
The swing link 36 is brought into contact with a tie rod 42 fixed to a part of the link 13, and presses the swing link 36 counterclockwise in FIG.

The fixed die 14 and movable die 15 are
As shown in the figure, crimp parts 14a, 14b, 15a, 15b that can crimp crimp terminals of two different sizes.
The crimping parts 14a and 14b on the fixed die 14 side are concave, and the crimping parts 15a and 15b on the movable die 15 side are convex. The movable die 15 is provided so as to be slidable in the left-right direction in FIG. 1 or 2. Further, a protrusion 15c is formed at the lower rear end of the movable die 15, and a trigger lever 44 is fixed to the protrusion 15c, which is disposed in front of the handle grip H mentioned above so as to swing around a pin 43. The tip of a flat spring 45 is brought into contact with the tip.

In addition, reference symbols S ₁ and S ₂ in FIG. 1 are the first and second switches of the type in which the on-off state of the internal contact is switched each time they are activated, and the first switch
_S1 is actuated by the trigger lever 44, and the second switch _S2 is disposed on the chassis 12 of the electric terminal crimping tool at a position where it can be actuated by the switch actuation piece 34c of the lever member 34. The wiring between the motor M and the power supply (not shown) is as shown in FIG.

In FIG. 3, one side of the parallel wiring leading to the motor M has a normally open contact a 1 of the first switch S ₁ and a normally open contact a ₁ of the first switch S 1
The normally closed contact b ₁ of the switch S ₂ is connected in series, and the normally closed contact a ₂ of the first switch S ₁ and the normally open contact b ₂ of the second switch S ₂ are connected in series. has been done. In addition, each contact point a ₁ of the first switch S ₁ ,
_a2 is turned on and off at the same time by the trigger lever 44.
The states of the contacts b ₁ and b ₂ of the second switch S ₂ are switched between the On and Off states at the same time by the switch operating piece 34c of the lever member 34.

The instructions for using the electric terminal crimping tool with the above configuration are as follows.
This will be explained below with reference to FIGS. 4 to 7 and FIGS. 8 to 10.

In the initial state shown in FIG. 4, the movable die 15 is separated from the fixed die 14 by a predetermined distance, the first switch S ₁ is in an inoperative state, and the second switch S ₂ is connected to the lever member 34. It is in the operating state by the switch operating piece 34c. In this state, the first and second switches are switched on as shown in Figure 8.
Contacts a ₁ and b ₂ of S ₁ and S ₂ are off, and contacts a ₂ and b ₁ are on
Therefore, the motor M is in a non-energized state.

From this state, the claws 3, 3 of the crimp terminal C having the desired dimensions are inserted into the terminal crimp portion 1 of the fixed die 14.
4a, 14b with corresponding dimensions, and pull the trigger lever 44 by a predetermined amount. Then, as shown in FIG. 5, the plate spring 45 fixed to the trigger lever 44 presses and moves the movable die 15 toward the fixed die 14, so that the crimp terminal C moves between the fixed die 14 and the movable die 15. sandwiched between. In this state, the movable die 15
has moved toward the fixed die 14, the toggle link mechanism T is stretched, and a gap is created between the protruding shoulder portion 36a of the first swing link 36 and the drive lever portion 34b of the lever member 34. Furthermore, since the trigger lever 44 is not in contact with the first switch _S1 , the contacts _a1 and _a2 of the switch _S1 are not switched, and the motor M is not started.

Next, after inserting the conductor 2 of the covered wire 1 into the claws 3, 3 of the crimp terminal C held between the fixed die 14 and the movable die 15, the trigger lever 44 is further pulled as shown in FIG. The trigger lever 44 operates the first switch S1, and the ninth switch _S1 is activated.
As shown in the figure, contact a ₁ is on and contact a ₂ is off.
state. Therefore, the motor M starts, and the rotational driving force of the motor M is transmitted to the first crankshaft 16 after being decelerated by the meshing of the pinion gear 20 fixed to the tip of the motor shaft 19 and the spur gear 23. The rotational movement of the first crankshaft 16 is transmitted to the link 29 via the connecting rod 25 connected to the eccentric shaft portion 16a of the crankshaft 16.
It is transmitted as a reciprocating rocking motion centered on .

Of the reciprocating rocking motion of the link 29, the rocking motion in the counterclockwise direction in the drawing causes the first one-way clutch 26 to be in a free state and the second one-way clutch 28 to be in a locked state. The signal is transmitted to the second crankshaft 17 by the second one-way clutch 28, and the second crankshaft 17 is rotated in small increments counterclockwise in the figure.

On the other hand, among the reciprocating rocking motions of the link 29, the clockwise rocking motion in the drawing causes the first one-way clutch 26 to be in the locked state and the second one-way clutch 28 to be in the free state. The one-way clutch 26 makes the second crankshaft 17 immobile relative to the chassis 12, 13, so that there is no transmission to the second crankshaft 17.

As the second crankshaft 17 rotates little by little in the counterclockwise direction in the figure as described above, the eccentric shaft portion 17a at the tip of the crankshaft 17 rotates.
presses the U-shaped groove 34a via the bearing 31 to rotate the lever member 34 counterclockwise in the figure.

As the lever member 34 rotates, the drive lever portion 34b of the lever member 34 comes into contact with the protruding shoulder portion 36a of the first swing link 36, and then presses the protruding shoulder portion 36a to move the drive lever portion 34b to the first swing link 36. swing link 36
is laid down counterclockwise in the figure against the elastic force of the leaf spring 41. On the other hand, the switch operating piece 34c of the lever member 34 is separated from the second switch _S2 , but
Since contacts b ₁ and b ₂ of this switch S ₂ do not switch,
The motor M is in operation.

The inverted movement of the first swing link 36 causes the movable die 15 to move to the left in the figure via a toggle link mechanism T composed of the first swing link 36 and the second swing link 40. is transmitted as a linear motion, and the movable die 15 is pressed toward the fixed die 14, so that the claw portion 3 of the crimp terminal C held between the fixed die 14 and the movable die 15,
3 is electrically and mechanically fixed to the conductor 2 of the covered electric wire 1.

Since the motor M remains in the operating state after this, the second crankshaft 17 further rotates, and when the crankshaft 17 rotates approximately half a turn from its initial state, the lever member 34 rotates as shown in FIG. The direction of rotation is reversed.

Therefore, since the lever member 34 rotates clockwise in the figure, the drive lever portion 3 of the lever member 34
4b rotates away from the protruding shoulder 36a of the first swing link 36, and the switch operating piece 34c rotates toward the second switch _S2 .

As the drive lever portion 34b of the lever member 34 rotates, the first swing link 36 is rotated by the leaf spring 41.
Due to the elastic restoring force, the movable die 15 moves clockwise in the figure to follow the drive lever portion 34b, so the movable die 15 moves rightward in the figure by the toggle link mechanism T and returns to the initial position. do.

On the other hand, the switch operating piece 3 of the lever member 34
4c, in order to operate the second switch _S2 when the movable die 15 returns to the initial position, as shown in FIG. 10, the contact _b1 is in the OFF state;
Contact _b2 turns on and motor M is stopped.
When the motor M stops, the second crankshaft 17 has made one revolution and returned to its initial position.

After that, the covered electric wire 1 is removed from the fixed die 14.
All you have to do is take out the crimp terminal C that has been crimp-connected to.

Effects of the Invention According to the present invention, the first switch starts the motor, the second switch automatically stops the motor, and the automatic stop position is set by the backward movement of the movable die. , the movable dice each time,
It is possible to automatically stop at the same position, that is, the position that has been reciprocated once, so that the crimp terminal can be reliably set next time, and the movable die does not have to perform crimping operations more than once in a row. This improves work efficiency.

[Brief explanation of drawings]

FIG. 1 is a partially omitted vertical sectional side view of the electric terminal crimping tool according to the present invention, FIG. 2 is a developed cross-sectional view along the power transmission path of the electric terminal crimping tool shown in FIG. 1, and FIG. is a wiring diagram of the electric crimping tool. FIGS. 4 to 7 are schematic diagrams for explaining the operating procedure of the electric terminal crimping tool, and FIGS. 8 to 10 show the on-off switch in each operating state of the electric terminal crimping tool. FIG. 3 is a wiring diagram for explaining an Off state. FIGS. 11 to 13 are perspective views for explaining a method of connecting a crimp terminal to a conducting wire. C... Crimp terminal, D... Drive device, H... Handle grip, M... Motor, L... Swing link mechanism, T... Toggle link mechanism, 2... Leading wire, 1
4...Fixed dice, 15...Movable dice, 16...
...First crankshaft, 16a...Eccentric shaft portion of first crankshaft, 17...Second crankshaft, 17a...Eccentric shaft portion of second crankshaft, 25...Conrod, 26... First one-way clutch, 28... Second one-way clutch, 29... Link, 32... Shaft member, 34... Lever member, 34a... U-shaped groove, 34b... Drive lever portion, 36... First swing link, 40...second swing link.

Claims (1)

[Claims] 1. A fixed die, a movable die that reciprocates toward the fixed die, and a swing lever that converts the rotation of a motor into a reciprocating swing motion and converts it into a one-way eccentric rotation motion. In an electric terminal crimping tool equipped with a movable die drive device that reciprocates the movable die via a toggle link mechanism, the electrical circuits of the motors are wired in parallel, and one of the wires is connected to a trigger lever. A normally open contact _a1 of a first switch that is turned ON by a pressing operation and a normally closed contact _b1 of a second switch that is turned OFF by a backward movement of the movable die of the swing lever mechanism are connected in series, The normally closed contact of the first switch, which is turned on when the trigger lever is pressed and released, is connected to the other side of the parallel wiring above.
a ₂ and the normally open contact of the second switch that is turned on by the backward movement of the movable die of the swing lever mechanism.
An electric terminal crimping tool characterized by connecting b ₂ in series.