JP3024607B2 - Crimping mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimping mechanism for crimping a crimping terminal to an electric wire, and more particularly, to peeling a sheath of a wire end to expose a core wire while holding the wire with a holder, After the peeling, the terminal held by the carrier is placed on the fixed lower type anvil, and the insulation terminal (hereinafter, referred to as a coating barrel) of the terminal is coated with a coating terminal, and a wire barrel (hereinafter, a core wire). A core wire is inserted into the barrel, and the movable upper crimper is lowered to plastically deform the coated barrel and the core wire barrel and crimped to the coated end of the electric wire and the core wire. Is performed automatically from the carrier.

[0002]

2. Description of the Related Art As shown in FIGS. 1 to 3, a crimp terminal (hereinafter, abbreviated as a terminal) used as a pickup terminal or the like is formed in a state where a plurality of strip-shaped conductive metal plates are punched out and arranged side by side. The terminal 1 is connected to the carrier 2 via a connecting portion 3, the tab inserting portion 4 having a pair of curved portions on both sides continuous with the connecting portion 3, and continuously connected to the front portion of the tab inserting portion 4. A core barrel 6 is integrally provided continuously with the coating barrel 5 and the front part of the coating barrel 5.

[0003] An electric wire W is inserted into the terminal 1 in a state where the sheath 7 of the terminal is peeled off and the core wire 8 is exposed.
Is wound around the core wire barrel 6 from both sides and crimped, and the coated barrel 5 is crimped and connected to the coated end 7 in a single-wound state. The terminal 1 crimped to the electric wire W is separated from the carrier 2 by cutting the connecting portion 3 at the time of crimping as described later.

A conventional crimping mechanism for crimping the terminal 1 to the electric wire W has a configuration shown in an exploded perspective view of FIG. 14 and a schematic front view of FIG. That is, the vicinity of the end of the electric wire W is clamped by the electric wire holder 10, and in this state, the peeling mechanism (not shown) advances to the end of the electric wire, strips the sheath 7 of the electric wire W, and exposes the core wire 8. Let it. Next, the cut-off punch 12, the covering crimper 13, the core wire crimper 14, and the wire retainer 15, which are integrally held by the movable holder 11, are lowered. At the time of lowering, first, a pressing tool 17 attached to the cutoff punch 12 by projecting downward through a spring 16 abuts on the wire holder 10, and the wire holder 10 urged upward by the spring 18 together with the wire W. Push down.

At the front of the wire holder 10, the peeling mechanism is retracted, and the wire W clamped by the lowered wire holder 10 is provided with a cutter 19 fixed to the front of the wire holder 10 and a covering anvil 20. , Core wire anvil 2
1 descends to the upper surface side. Anvils 20 and 2 above
The terminal 1 is sequentially placed on the upper surface of the terminal 1 while being held by the carrier 2, and the coating 7 of the descending electric wire W is inserted into the coating barrel 5 of the terminal 1 and the core wire 8 is inserted into the core wire barrel 6.

Further, when the movable holder 11 is lowered, the wire presser 15 urged downward by the spring 22 presses the end of the core wire 8 on the side of the coating 7, and then the crimper 13 for coating and the lower surface of the crimper 14 for the core wire. The mold hole surfaces 13a and 14a respectively provided on the upper and lower surfaces of the barrel 5 and the core wire barrel 6 project upward.
Is plastically deformed and pressed against the coating 7 and the core wire 8.
At the same time, the connecting portion 3 between the carrier 2 and the terminal 1 is sheared by the cut-off punch 12 and the cutter 19 to separate the terminal 1 from the carrier 2.

[0007]

In the above crimping mechanism, if the clamping force of the electric wire holder 10 is weakened, the lowering of the electric wire holder 10 can be promoted. A malfunction that is not done well occurs. That is, as shown in FIGS. 19 (A) and (B), in the peeling step of the previous step, after the wire W is clamped by the wire holder 10, a cut is made in the coating 7 of the terminal with the peeling blade 29. When the peeling blade 29 is retracted to peel off the cut coating, the clamping force on the electric wire W requires a strong force. However, in the subsequent crimping step, it is only necessary to hold the wire, and the clamping force may be weak. However, conventionally, the wire is clamped with a constant strong clamping force until the completion of the crimping step.

As shown in FIG. 14, the clamp force is applied to a cam 30 rotated by a motor (not shown).
A to 31C are linked to each other, and the movable holder 10B is moved toward the fixed holder 10A against the spring 32 by pushing the opening / closing rod 27 by the link 31c to generate a clamping force. Have the same clamping force.

Furthermore, in connection with the above problem, even if the clamping force of the wire holder 10 is strong, if the force of the spring 16 for urging the pressing tool 17 downward is increased, the lowering of the wire holder 10 is promoted. it can. However, in this case, the spring 16 is quickly set, and it is necessary to always control the spring force of the spring. In addition, wire holder 1
Since the end surface of the wire holder 10 is a slide cutter that forms a shearing portion between the wire holder 10 and the cutter 19, the spring 16 is too strong and the wire holder 10 is pressed against the spring 18 that urges the wire holder 10 upward. If the descent starts quickly, there is a problem that the timing at which the terminal 1 is separated from the carrier 2 becomes too fast.

That is, as shown in FIGS. 20A, 20B and 20C, the wire holder 10 clamping the wire W is lowered by the pressing tool 17 attached to the cutoff punch 11 via the spring 16. Then, the sheath 7 and the core wire 8 of the electric wire W are lowered quickly until the movement shown in (A) and (B) until the sheath 7 and the core wire 8 are inserted into the barrels 5 and 6 of the terminal 1, and after the insertion shown in (B), (C) It is preferable that the wire holder 10 is lowered after or immediately before the end of the crimping shown in FIG. However, in the conventional mechanism, the lowering of the wire holder 10 is too slow or too early,
It is not controlled as described above.

In connection with the above problem, the cutter 19 is moved immediately after the wire holder 10 is lowered and the wire W is inserted into the terminal 1.
The problem is that the terminal 1 and the carrier 2 are separated between them. That is, as shown in FIG. 21, the terminal 1 is separated from the carrier 2 before the barrels 5 and 6 of the terminal 1 are wound around the sheath 7 and the core wire 8 of the electric wire W.

For this reason, as shown in FIGS. 22A and 22B, the boundary between the core wire 8 and the coating 7 is pressed by the wire press 15, but since the wire press 15 is very thin, It is easily deformed as shown in FIG.
As shown in (1), the holding portion 15a is apt to crack. In this case, there is a disadvantage in that the bell mouth BM for preventing core wire cutting formed at the coating-side end of the terminal barrel 6 shown in FIG. 24 is deformed.

Furthermore, the wire holder 10 for clamping the wire W is lowered by the pressing tool 17 attached to the cut-off punch 12, and the sheath 7 and the core wire 8 of the wire W are inserted into the barrels 5 and 6 of the terminal 1. However, before the sheath 7 and the core wire 8 are inserted into the barrels 5 and 6 without the electric wire W descending, a crimping process of the barrels 5 and 6 by the crimpers 13 and 14 is often performed. When the crimping starts at the time when the electric wire W does not fall, first, the mold hole 13a of the covering crimper 13 shown in FIG. 16 (A) is inserted into the covering barrel 5 as shown in FIG. 16 (B).
In a state in which the coating barrel 5 is not completely inserted into the inside, it hits the coating barrel 5 with the mold hole surface 13b projecting downward, and the coating barrel 5 is plastically deformed. When such crimping is performed, the coating barrel 5 is not wound around the entire coating 7 as shown in FIG.
A defect such as cutting into the inside of the coating 7 occurs.

As shown in FIGS. 18 (A) and 18 (B), the above problem is caused by moving the mechanism of the electric wire holder 10 to the movable holder 10B connected to the fixed holder 10A by a spring 26.
Is moved to the fixed holder 10A side by the opening / closing rod 27, and the electric wire W is clamped between the holding portions of both holders 10A and 10B. As shown in FIG. If it is too strong, it is pressed against the base wall surface 28 on the side of the fixed holder 10A, and occurs because the pressing tool 17 cannot sufficiently press down.

The present invention solves the above-mentioned problems and improves the shape of the cam for controlling the clamping force of the wire holder of the crimping mechanism, thereby lowering the timing of the wire holder, crimping timing, and cutting the terminal and the carrier. It is an object of the present invention to adjust the timing in conjunction with each other so that crimping of the terminal is performed with high accuracy.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for fixing a crimp terminal having a coating barrel wound around a terminal coating of an electric wire and a core wire barrel wound around a core wire protruding from the terminal coating. Placed on the lower anvil, the movable upper crimper is lowered, the covering barrel and the core barrel are plastically deformed and a crimping mechanism for crimping to the electric wire, and a movable holder and a fixed holder for clamping the electric wire are provided. The movable holder is moved to the fixed holder side, the electric wire is clamped between both holders, and the movable holder is moved by linking the link to the cam, and the movable holder is formed on the cam. A notch is provided at the projecting part for moving the clamp, so that the clamping force of the electric wire by the electric wire holder is increased when peeling the skin, but weakened when crimping. It provides a pressing mechanism, characterized in that there.

As described above, when the clamping force of the electric wire holder is improved by the shape of the cam and the electric wire is clamped by a strong force in the peeling process, the peeling is performed with high accuracy, while the electric wire is weakened in the crimping process. By clamping, the wire holder and the wire can be smoothly lowered by the pressing tool, and the wire can be securely inserted into the barrel of the terminal before the crimping process starts.

Further, a crimp terminal having a coating barrel wound around the terminal coating of the electric wire and a core wire barrel wound from both sides around a core wire protruding from the coating is placed on a fixed lower anvil, and the In a crimping mechanism for lowering the mold crimper and plastically deforming the coated barrel and the core wire barrel and crimping the wire, the crimping mechanism for crimping the coated barrel is projected downward from a mold hole formed at the center of the lower end of the covering crimper. In the winding side die hole forming portion, a notch portion which is stepwise expanded outward from the center die hole is continuously formed, and when the coating crimper descends, the projecting portion of the coating barrel is formed in the stepped notch portion. It is preferable that the winding operation of the coating barrel is delayed by delaying the winding operation, and the winding operation of the coating barrel is performed in the center hole just before the lower end of the coating crimper.

As described above, when the shape of the coated crimper is improved and a cutout portion is provided on the winding side of the coated barrel, the winding operation of the coated barrel can be delayed, and after the wire is securely lowered, or Even if crimping starts during the lowering of the wire, it is wound last at the mold hole, so that the crimping of the sheath barrel to the wire sheathing portion can be performed accurately.

Further, a pusher which is urged downward via a spring and protrudes downward from the cutoff punch is attached to the cut-off punch which descends in conjunction with the movable upper type crimper, and the push-down tool applies an electric wire. Lower the holder,
In the case of inserting the electric wire into the terminal and cutting the terminal from the carrier between the sheared surface formed on the side surface of the electric wire holder and the cutter arranged on the side, the terminal is locked to the cut-off punch of the pressing tool. Of the inverted L-shaped upper end locking portion, the lower surface of the horizontal portion abutting on the cut-off punch locking surface is cut to a required thickness to have a small width, and the lower end of the pressing tool is projected by the cut thickness. The pressing tool that descends in conjunction with the cut-off punch quickly hits the wire holder and pushes down the wire holder, and the upper end surface that contacts the lower surface of the spring of the upper end locking portion is notched to a required thickness. The width of the terminal, and the lowering time of the pressing tool and the electric wire holder by the spring are delayed by the above-mentioned notched thickness, so that the terminal and its key between the shear surface of the electric wire holder and the cutter arranged on the side are delayed. It is preferable that a configuration for delaying the disconnection timing of the rear.

As described above, when the shape of the pressing tool attached to the cut-off punch is improved and the width of the upper end locking portion is reduced, the downward projecting amount of the pressing tool becomes large. The descent can be performed quickly. Therefore, by the time the crimping step by the crimper starts, it is possible to reliably insert the wire covering portion held by the wire holder into the covering barrel of the terminal and the core wire into the core barrel. And, after the pressing tool descends the wire holder and inserts the electric wire into the terminal, the pressing tool is urged upward by the spring of the wire holder and the spring which presses the pressing tool by the lowering of the cut-off punch itself. After the compression limit which cannot be compressed above, the lowering of the cut-off punch can delay the time when the pressing tool lowers the wire holder, and can delay the cutting time of the terminal and the carrier by the wire holder and the cutter. . Therefore, it is possible to prevent the terminal from being separated before crimping, and to crimp the terminal in a stable state.

Further, the fixed lower mold anvil for coating and a cutter fixed to the side thereof are integrally formed,
The upper surface of the cutter may be formed in the same shape as the coating barrel mounting surface of the coating anvil, and the terminal coating barrel may be mounted on the coating barrel mounting surface having a wider width as a unit to perform crimping. preferable.

As described above, the cutter and the covering anvil, which are fixed to the sides of the electric wire holder, are integrated, and
When the coating barrel is placed on the terminal mounting surface having a wide width, the position of the coating barrel can be stabilized at the time of crimping, and variations in the crimping operation can be eliminated.

As described above, by adjusting the lowering timing of the wire holder for inserting the wire into the terminal and the timing of starting the crimping process, the wire is securely inserted into the barrel of the terminal before the crimping is performed. The crimping process and the carrier crimping process are adjusted so that the cutting is not performed before the crimping process starts, but after or just before the crimping process. This can prevent or reduce the occurrence of poor pressure bonding.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a crimping mechanism for a crimp terminal according to the present invention will be described below with reference to the drawings. The shape of the crimp terminal itself is the same as that shown in FIGS. 1 to 3, and the overall configuration of the crimp mechanism is the same as that shown in FIGS. The same members are denoted by the same reference numerals, and the present invention will be described in comparison with a conventional example.

First, the shape of the coated crimper 50 is improved from the shape shown in FIG. 16A to the shape shown in FIG. That is, a winding side mold hole projection 53 projecting downward is formed on one winding side of a mold hole 52 curved concavely at the center of the lower end of a vertically long rectangular flat plate portion 51. Mold hole 5
The notch portion 54 is formed by expanding the inner surface continuous with the step 2 outward in a stepped manner. In the figure, the dotted line indicates the conventional inner surface position.

When the covering crimper 50 has the above-mentioned shape,
As shown in FIG. 5 (A), in the conventional shape, the winding of the coating barrel 5 starts from the beginning on the inner surface 13b of the projecting portion 13. On the other hand, as shown in FIG. In this case, the upwardly protruding portion of the coating barrel 5 is inserted into the notch portion 54 and the winding operation does not start. That is, the winding operation of the coating barrel 5 does not start while the coating crimper 50 descends the distance of the height L of the notch portion 54, and the winding operation starts after the central mold hole 52 reaches the upper end of the coating barrel 5. The winding operation is shown in FIGS.
The coating barrel 5 is securely pressed against the coating 7 in a single-wound state covering the entire coating 7.

As described above, the winding operation of the coating barrel 5 is delayed, and the winding operation of the coating barrel is started near the end of the crimping step to crimp the coating barrel 5 onto the wire coating 7. Even if the insertion into the barrel 5 is delayed, the coating barrel 5 can be securely pressed against the coating 7.

FIG. 7 shows the timing relationship between the winding operation of the coating barrel by the coating crimper, the cutting operation of the terminal and the carrier described later, and the adjustment operation of the clamping force of the electric wire by the electric wire holder. FIG. 8 shows a similar temporal relationship in the conventional example. In FIGS. 7 and 8,
The first stage from the top shows the relationship between the covering clamp and the winding operation of the terminal, the second stage shows the relationship between the cut-off punch and the lowering operation of the pressing tool, and the third stage shows the covering held by the covering anvil and the cutter. The relationship between the winding operation on the barrel and the detaching operation of the terminal from the carrier is shown, and the fourth stage at the bottom shows the relationship between the operation of the wire holder cam, the stripping of the wire and the terminal crimping operation. These operations indicate that the operations described in the same step are performed at the same time from the first step to the sixth step.

As can be seen from a comparison between FIG. 7 and FIG. 8, the winding operation of the coating barrel by the coating clamp is performed in the sixth step of the final stage in the present invention. This is done from the fourth step.

In the present pressure bonding mechanism, the shape of the pressing tool 60 attached to the cut-off punch 12 is configured as shown in FIGS. 9A and 9B. Cut-off punch 12 which is lifted and lowered integrally with the movable upper mold crimper and core wire crimper
As described above, the wire holder 10 also serving as a slide cutter disposed below is lowered against a spring 18 for urging the wire holder 10 upward. The cut-off punch 12 is provided with an opening 12a on one side thereof, and has a through hole 12b for sliding a pressing tool from the lower surface to the lower end of the opening 12a, and a sprig mounting hole 12c formed upward from the upper surface. are doing. In the through hole 12b, the longitudinal axis portion 61 of the inverted L-shaped pusher 60 whose tip is bent in the horizontal direction is slidably penetrated, and the horizontal portion bent from the upper end is an upper end locking portion 62.
It is locked to the lower end surface of the opening 12a. The upper end locking portion 62
The spring 16 is compressed between the upper surface of the spring and the sprig mounting hole 12c. Therefore, the pressing tool 60 is urged downward by the spring 16, and the lower end of the longitudinal axis portion 61 protrudes from the lower end surface of the cut-off punch 12.

The spring force of the spring 16 for urging the pressing tool 60 downward is set to be the same as that of the related art in relation to the spring force of the spring 18 for urging the wire holder 10 upward. On the other hand, as shown in FIG. 9 (B), the upper end locking portion 62 of the pressing tool 60 has a thinner width by cutting out the lower surface 62a of the horizontal portion abutting on the locking surface 12d of the lower end of the opening by the width D1. Therefore, the lower end of the vertical axis portion 61 of the pressing tool 60 is projected downward by the thickness of the notch width D1 as compared with the related art. Further, the upper surface 62b of the upper end locking portion 62 to which the lower end of the spring 16 is pressed is cut by a width D2 to have a small width. Therefore, the distance depressed by the spring force of the spring 16 is delayed by the notched width D2.

Pressing tool 60 for lowering wire holder 10
7, the cut-off punch 12 is first lowered integrally with the upper die holder 11, the covering crimper 50, and the core wire crimper 14, as shown in the second row from the top in FIG. . Due to the lowering, as shown in the fourth to fifth steps, the cut-off punch 12
The lower end of the longitudinal axis portion 61 of the pressing tool 60 protruding from the lower end of the pressing member 60 first comes into contact with the upper surface of the electric wire holder 10 and lowers the electric wire holder 10 against the spring 18. Since the projecting amount of the pressing tool 60 during this lowering is made larger by D1 than before, the wire holder 10 can be lowered faster than before, and the covering 7 of the wire W clamped by the lowering of the wire holder 10 Core wire 8 is connected to barrels 5 and 6 of terminal 1
Can be inserted faster than before.

A spring 1 for urging the wire holder 10 upward when the wire holder 10 is lowered by the pressing tool 60
The spring 16 is compressed by the spring force of 8, and the pressing tool 6
0 rises in the through hole 12b of the cut-off punch 12 and the amount of protrusion from the lower end of the cut-off punch 12 gradually decreases. The raising of the pressing tool 60 and the cut-off punch 12
The spring 16 is compressed by the lowering of itself, but after reaching the compression limit, as shown in the sixth step, when the cutoff punch 12 further descends, the tip of the pusher 60 pushes down the wire holder 10. By this pushing-down operation, a shearing action is generated between a shear plane provided on the side surface of the electric wire holder and an anvil / cutter 70 which will be described later, and the terminal 1 is separated from the carrier 2.

In the above operation, since the upper surface of the upper end locking surface 62 of the pressing tool 60 is thinned by the width D2, the length L (spring length) between the lower end and the upper end of the spring 16 before the load is applied. Is longer by D2 than before, so that the time to reach the compression limit can be delayed by an amount equivalent to the length L than before. Therefore, the timing of cutting the terminal 1 and the carrier 2 caused by the lowering of the cut-off punch 12 after reaching the compression limit can be delayed as compared with the conventional case. That is, in the present invention, as shown in FIG.
The terminal is cut off from the carrier in the fourth step before the crimping is performed in the prior art, although the time for cutting the wire and the carrier 2 is made near the end of the crimping operation in the final sixth step.

Further, in the present pressure bonding mechanism, as shown in FIG. 11, a cutter / coating anvil 70 is provided in which the cutter 19 and the coating anvil 20 which are separately provided conventionally are integrated. The cutter 19 fixed between the fixed covering anvil 20 and the wire holder 10 also serving as the slide cutter has a shear edge at the side edge 19a on the wire holder side, so that the shear edge can be left. If it is integrated with the covering anvil 20, there is no problem.
Therefore, a cutter / coating anvil 70 in which the cutter 19 and the coating anvil 20 are integrated is provided, and the terminal mounting surface on the upper surface on the cutter side has the same shape as the anvil side.
A wide terminal mounting surface 71 is formed. Terminal mounting surface 7
Numeral 1 has a width of S1 + S2, which is the sum of the width S1 of the terminal mounting surface 20a of the conventional anvil and the width S2 of the cutter 19, and is substantially doubled as compared with the conventional terminal mounting surface.

As described above, the terminal placement surface 70 on the lower mold fixed side
Since a is provided wide, the terminal 1 mounted on the terminal mounting surface is held in a stable state as shown in FIG. That is, the cover barrel 5 of the terminal 1 and the substrate portion of the tab insertion section 4 are held on the terminal mounting surface. The core barrel 6 is mounted on the core anvil 21 as in the conventional case, and the core 8 is held down by the wire holder 15. still,
Since the terminal 1 is stably fixed as described above, the wire retainer 15 is not always necessary. As described above,
Since the entire terminal 1 is fixed on the anvil and the terminal 1 is not separated from the carrier 2 before the crimping operation but near the end of the crimping operation as described above, the crimping of the terminal is performed. It can be performed in a stable state.

According to the present invention, as shown in FIG. 13, the movable holder 10B of the electric wire holder 10 is
The opening / closing rod 27 for moving to the 0A side is connected to the links 31A to 3A.
Improvements have been made to the shape of the cam that operates via 1C.
Similarly to the conventional example, when the main shaft 81 of the cam 80 is rotated by a motor (not shown), and the projecting portion 82 which is provided on the outer peripheral surface of the cam 80 and is unevenly distributed in the circumferential direction contacts the link 31A,
Link 31C and opening / closing rod 27, movable holder 10
B, close to the fixed holder 10A side,
Is clamped. When the tip of the link 31A comes into contact with the outer peripheral surface other than the protruding portion 82 of the cam, the link 3
1C moves rightward, so that the opening / closing rod 27 and the movable holder 10B move rightward by the spring 32 to open between the fixed holder 10A.

The cam 80 for clamping the electric wire W
In the circumferential direction of the projecting portion 82, a portion shown by oblique lines in the drawing is cut out, and when the link 31A contacts the notched portion 83, the moving distance of the link 31C, the opening / closing rod 27, and the movable holder 10B to the left is reduced. , So as to weaken the clamping force on the electric wire W. That is, a step is provided in the protruding portion of the cam 80, and the clamping force for the electric wire is set to two levels of strength.

The relationship between the rotation of the cam 80 and the step of stripping the electric wire W and the step of crimping the terminals are as shown in the lowermost part of FIG. 7. The link 31A is in contact with the portion 82,
Therefore, the electric wire W is clamped by a strong clamping force. Next, when entering the fourth step and the fifth step, the wire holder 10 is lowered and the step of inserting the wire W into the terminal 1 is started, so that the link 81A comes into contact with the cutout portion 83 and the clamping force is weakened. Therefore, the force with which the fixed holder 10A is pressed against the base wall surface side is weakened, and the wire holder 10 can be smoothly lowered by the pressing tool 60.

After the completion of the crimping step of the sixth step, the link 31A is disengaged from the notch 83, so that the movable holder 10B is separated from the fixed holder 10A by the spring, the wire W is disengaged, and the terminal is crimped. The electric wire W is taken out.

By slightly changing the shape of the cam 80 as described above, the clamping force of the electric wire W can be adjusted, and the electric wire W is clamped by a clamping force suitable for the peeling step, the inserting step of the electric wire into the terminal, and the crimping step. Can be clamped.

As described above, in the present invention, as shown in FIG. 7, the step of crimping the coated barrel 5 is performed in the final sixth step after the electric wire W is inserted into the terminal 1. As a result, the pressure of the coating barrel can be accurately pressed without deformation. Also, cut-off punch 1
The lowering timing of the electric wire holder 10 also serving as the slide cutter lowered by the pressing tool 60 attached to the terminal 2 is adjusted at a timing earlier than before until the electric wire W is inserted into the terminal 1, so that the above-mentioned sixth step is performed. The wire W can be reliably inserted into the barrels 5 and 6 before the step of crimping the coated barrel 5 and the core barrel 6.

Further, the wire holder 1 is pressed by the pressing tool 60.
0, the terminal 1 and the carrier 2 are separated from the carrier and the anvil 70 by the descent of the crimping process in the final sixth step near the end of the crimping step, and the terminal 1 is widened when the crimping is performed. Since it is held on the terminal mounting surface of the cutter / covering anvil 70, the crimping process can be performed in a stable state.

In addition, the lowering speed of the electric wire holder 10 related to all the steps is such that the clamping force of the electric wire holder 10 is reduced by the cam 80 in the inserting step and the crimping step of the electric wire from the peeling step in the previous step. Since the shape is adjusted so as to be weakened, the wire holder 10 can be accurately controlled based on the shapes of the springs 16 and 18 and the pressing tool 60.

[0046]

As is apparent from the above description, according to the present invention, the timing of the descending speed of the wire holder is adjusted in conjunction with the timing of crimping and the timing of separating the terminal and the carrier. Combined with the improvement of the shape of the cam for controlling the clamping force of the cutter and the wire holder, deformation that occurs during crimping, which has been a problem in the past, for example, the unevenness of the bell mouth left and right and the coating barrel can cause Can be prevented from being unwound in a state where it is partially wound without being wound, and accurate and accurate pressure bonding can be performed without variation.

[Brief description of the drawings]

FIG. 1 is a plan view of a crimp terminal to be crimped by the present invention.

FIG. 2 is an exploded perspective view of the crimp terminal and an electric wire.

FIG. 3 is an enlarged front view of the crimp terminal.

FIG. 4 is a perspective view of a coated crimper according to the present invention.

5 (A) and 5 (B) are front views showing differences between the conventional shape of the coated crimper and the shape of the present invention at the time of crimping operation.

FIGS. 6A and 6B are cross-sectional views showing a crimping operation by the coated crimper of the present invention shown in FIG.

FIG. 7 is a drawing showing the operations of the respective parts of the present invention in the points of improvement from the first step to the sixth step, and showing the interlocking of these operations.

FIG. 8 is a drawing similar to FIG. 7 showing the interlocking of the operation in the conventional example.

FIGS. 9A and 9B are views showing a pressing tool according to the present invention.

FIG. 10 is a diagram showing the relationship between the timing for separating the terminal and the carrier and the timing for crimping according to the present invention.

FIG. 11 is a drawing showing the shape of a cutter and a coated anvil according to the present invention in relation to a conventional example.

FIG. 12 is a plan view showing a state in which the terminal is held by the cutter / coated anvil shown in FIG. 11;

FIG. 13 is a view showing a shape of a cam for adjusting a clamping force of an electric wire holder according to the present invention.

FIG. 14 is an exploded perspective view of a conventional pressure bonding mechanism.

FIG. 15 is a schematic front view of a main part of a conventional crimping mechanism.

FIG. 16 (A), (B), (C) shows a conventional coated crimper,
It is a drawing which shows the electric wire crimped by this covering crimper and the crimping operation.

FIG. 17 is a perspective view showing a deformed state in the crimping operation shown in FIG.

FIGS. 18A and 18B are schematic front views showing the problems of the conventional electric wire holder.

FIGS. 19A and 19B are schematic diagrams showing the clamping force of an electric wire by an electric wire holder.

20 (A), (B), and (C) are schematic front views showing the lowering operation of the wire holder by the conventional pressing tool.

FIG. 21 is a plan view showing a conventional terminal and carrier disconnection timing.

FIGS. 22A and 22B are a front view of a conventional wire presser and a side view showing the relationship with an electric wire.

FIGS. 23A and 23B are diagrams showing a deformed state of the wire retainer shown in FIG. 22.

FIG. 24 is a perspective view showing a bell mouth formed at the time of terminal crimping.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crimp terminal 2 Carrier 3 Connecting part 4 Tab insertion part 5 Coated barrel 6 Core wire barrel W Electric wire 7 Coating 8 Core wire 10 Electric wire holder 10A Fixed holder 10B Movable holder 12 Cut-off punch 13,50 Coated crimper 14 Core wire crimper 15 Wire holder 16, REFERENCE SIGNS LIST 18 spring 17, 60 pressing tool 19 cutter 20 covering anvil 21 core wire anvil 27 opening and closing rod 30, 80 cam 70 cutter and covering anvil 71 terminal mounting surface 52 central hole 53 winding side hole projecting portion 54 cutout portion 62 upper end locking Part 82 projecting part 83 notch part

Claims (1)

(57) [Claims] A crimp terminal having a coating barrel wound around a terminal coating of an electric wire and a core wire barrel wound around a core wire protruding from the terminal coating is mounted on a fixed lower anvil, and a movable upper type crimper is provided. Is lowered to form a crimping mechanism for plastically deforming the coated barrel and the core wire barrel and crimping the wire to an electric wire, and providing an electric wire holder comprising a movable holder and a fixed holder for clamping the electric wire, and moving the movable holder to the fixed holder side. Moving and clamping the electric wire between the two holders, and moving the movable holder by linking the link to the cam, wherein a notch is provided in a protrusion for clamping movement formed on the cam, and the notch is provided by the electric wire holder. A crimping mechanism characterized in that the clamping force of an electric wire is increased when the skin is stripped, but weakened when the wire is crimped.