JP2011124060A - Electric wire position detecting device of terminal crimping machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance crimping quality by reliably detecting a gap between a tip end of the core of an electric wire and up-and-down or right-and-left displacement of the core on an anvil at crimping of the electric wire to a terminal. <P>SOLUTION: A terminal crimping machine 1 includes an anvil 6 for a terminal to be arranged, a crimper 11 capable of lifting, and a wire positioning plate 7 for striking a tip end of the core 21 of the electric wire 20 to be set on the anvil. A wire position detecting device for the crimping machine includes a reflector 8 for background reference setting fixed to the wire positioning plate, and a laser side length sensor 5 irradiating laser beams 23 on the reflector or the tip end on the core further front than the reflector and receiving each reflection light 24, 25. The laser side length sensor 5 is connected to a laser sensor amplifier which is connected to a control relay, and the control relay is connected to a crimpable lamp and a crimping machine drive switch. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a terminal crimping machine that manually supplies an electric wire between an anvil and a crimper of a crimping machine and detects a misalignment of the core wire part when the wire core wire part is brought into contact with an electric wire positioning plate for positioning. It is related with the electric wire position detection apparatus.

  FIG. 6 shows one embodiment of a wire positioning mechanism of a conventional terminal crimping machine (see Patent Document 1).

  The electric wire positioning mechanism of this terminal crimping machine is configured such that the terminal 61 is set on the anvil 63 below the crimper 62, the electric wire 64 is set on the terminal 61, and the end of the core wire portion (conductor) 64a of the terminal of the electric wire 64 Is pressed against the electric wire positioning plate 65, and in that state, a switch (not shown) is pushed to lower the crimper 62, and the terminal of the electric wire 64 is crimped and connected to the terminal 61 with the anvil 63. .

  The core wire portion 64a is crimped and connected to a pair of crimping pieces 66 on the front side of the terminal 61 by a front crimper 62a, and the insulation coating portion 64b following the core wire portion 64a is a pair of crimping pieces on the rear side of the terminal 61 by a rear crimper 62b. Crimped to 67. The electric wire positioning plate 65 is disposed between the front crimping piece 66 and the front electrical contact portion (in this example, a female electrical contact portion) 68.

  As an electric wire positioning mechanism of a terminal crimping machine other than the above, for example, in Patent Document 2, a center mark of a core wire abutting position is provided on the electric wire positioning plate, and the electric wire positioning plate is pivoted vertically on the frame of the terminal crimping machine. A device that prevents the interference between the terminal and the electric wire positioning plate is described. Patent Document 3 discloses that the electric wire positioning plate is rotated upward as the crimper is raised, To prevent interference.

  Further, in Patent Document 4, although it is not a terminal crimping machine, the core wire portion is interposed between the light emitter and the light receiver of the optical sensor when the end of the electric wire is peeled off and the core wire portion is exposed before the terminal crimping. And inspecting the quality of peeling.

  Further, in Patent Document 5, an optical path of an optical sensor is set between a pair of crimping dies for terminal crimping, and an optical path is formed when the pair of crimping dies are not completely closed. It is described that the optical path is interrupted when it is completely closed and crimping is completed.

JP-A-9-161938 (FIG. 1) JP-A-10-223347 (FIG. 1) Japanese Patent Laying-Open No. 2007-311062 (FIG. 1) JP 59-123413 (FIG. 4) Japanese Patent Laying-Open No. 2007-227218 (FIG. 4)

  In the conventional wire positioning mechanism of the terminal crimping machine of FIG. 6 described above, particularly when the wire 64 is manually crimped to the terminal 61, due to a difference in operator's sense or a human error, the core portion 64a of the wire 64 is There is a gap between the tip and the electric wire positioning plate 65, or the core wire portion 64a is displaced on the anvil 63, for example, in the range of the gap between each pair of the crimping pieces 66 and 67 of the terminal 61. There was a problem that the crimping accuracy (crimping quality) decreased.

  In the present invention, in view of the above points, when crimping an electric wire to a terminal manually or the like, there is a gap between the tip of the core portion of the electric wire and the electric wire positioning plate, or the core portion is vertically and horizontally on the anvil. An object of the present invention is to provide an electric wire position detection device for a terminal crimping machine that can reliably detect displacement and improve the crimping quality with a terminal.

  In order to achieve the above object, an electric wire position detecting device for a terminal crimping machine according to claim 1 of the present invention includes an anvil in which a terminal is arranged, a crimper that can be moved up and down, and a tip of a core portion of an electric wire set on the anvil. In a terminal crimping machine comprising an electric wire positioning plate that abuts, a background reference setting reflector fixed to the electric wire positioning plate, and a laser beam is applied to the reflector or the core portion in front of the reflector. And a laser-side length sensor that receives each reflected light.

  With the above configuration, the reflector is irradiated with a laser beam, and the distance (background reference) from the laser side length sensor to the reflector is measured by the reflected light by the trigonometric method, and the exposed core portion of the wire is brought into contact with the positioning plate. In this state, a laser beam is irradiated onto the tip of the core wire portion, and the distance from the laser side length sensor to the core wire portion with respect to the background reference is similarly measured with the reflected light. The reflection angle of the laser beam is larger in the core portion than in the reflector.

  When the tip of the core wire part is not in contact with (distant from) the wire positioning plate, the laser beam passes through the tip of the core wire part and reflects off the reflector without being hit by the core wire part, so that a positioning error of the wire is detected. The In addition, when the core wire portion is displaced up and down from the normal position, the distance to the core wire portion is measured longer than the normal case when the laser beam hits the upper end portion or the lower end portion instead of the radial center of the core wire portion. Therefore, a positioning error of the electric wire is detected. In addition, when the core wire part is misaligned to the left and right than normal, the laser beam hits the center in the radial direction of the core wire part, but the distance to the core wire part is measured longer than the normal case. A defect is detected.

  The electric wire position detection device for a terminal crimping machine according to claim 2 is the electric wire position detection device for a terminal crimping machine according to claim 1, wherein the laser side length sensor is connected to a laser sensor amplifier, and the laser sensor amplifier is connected to a control relay. The control relay is connected to a crimpable lamp and a crimping machine drive switch.

  With the above configuration, the trigonometric distance is calculated by the laser sensor amplifier and the pass / fail judgment with respect to the reference value is performed. When the distance to the core wire satisfies the reference value, the crimpable lamp is turned on via the control relay and the terminal The driving circuit of the crimping machine is connected via the crimping machine drive switch, and crimping is possible. If the distance to the core does not meet the reference value, the control relay will not operate, the crimpable lamp will not light up, and even if the crimper drive switch is pressed, the terminal crimper drive circuit will not be connected and crimping will not be possible. It becomes.

  According to the invention of claim 1, by accurately defining the background reference with the reflector, it is possible to prevent erroneous detection associated with the irregular reflection of the laser beam hitting the complicated shape portion of the terminal crimping machine, Also, by measuring the distance to the core part of the electric wire using the laser side length sensor, there is a gap between the tip of the electric wire core part and the electric wire positioning plate, or the core part is vertically and horizontally on the anvil. It is possible to reliably detect that the position is shifted, and thereby, the crimping quality of the terminal and the electric wire can be improved.

  According to the second aspect of the present invention, when a gap is formed between the tip of the core portion of the electric wire and the electric wire positioning plate, or the core portion is displaced vertically and horizontally on the anvil, the operator presses the switch. However, since the terminal crimping machine does not operate, it is possible to reliably prevent crimping failure.

It is a front view which shows one Embodiment of the electric wire position detection apparatus of the terminal crimping machine which concerns on this invention. It is a principal part expansion perspective view which similarly shows the electric wire position detection apparatus of a terminal crimping machine. It is explanatory drawing which similarly shows the connection circuit form of the electric wire position detection apparatus of a terminal crimping machine. It is a top view of the state which irradiates a laser beam to the core line part of the electric wire which faced the electric wire positioning plate. (A) is an example of a detection when the core line part of an electric wire has shifted up and down, and (b) is an explanatory view showing an example of a detection when a core line part has shifted in the right and left direction, respectively. It is a perspective view which shows the state which positions and crimps | bonds an electric wire in the conventional terminal crimping machine.

  1 to 3 show an embodiment of an electric wire position detection device for a terminal crimping machine according to the present invention.

  As shown in FIG. 1, the electric wire position detection device of this terminal crimping machine includes a laser side length sensor 5 disposed on a frame base 3 on which an applicator 2 of the terminal crimping machine 1 is placed via a set base 4, an application And a reflector (reflecting member) 8 fixed to the electric wire positioning plate 7 on the side of the anvil 6 of the heater 2.

  The applicator 2 is an existing applicator, a ram 10 that can be moved up and down along the frame 9, a crimper 11 fixed to the ram 10, and a spring bias upward in the block 12 facing the lower side of the crimper 11. And the terminal feed mechanism 14 which feeds the horizontal chain terminal 13 onto the anvil 6 in conjunction with the movement of the ram 10.

  A shank 15 at the upper end of the ram 10 is detachably engaged with a hook 16 of a drive side device (not shown), and the drive side device has an AC power source motor, a crankshaft, a toggle link, or a vertical hydraulic cylinder. The ram 10 is driven up and down. A terminal crimping machine 1 is composed of a detachable applicator 2 corresponding to the type of terminal and a fixed drive side device.

  As shown in FIGS. 1 and 2, the laser side length sensor 5 of the electric wire position detection device has a lower light projecting port 17 and an upper light receiving port 18 sealed with a translucent resin of the case 19. The case has a light projecting unit and a light receiving unit (not shown). In this example, the laser side length sensor 5 is disposed adjacent to the right side of the applicator 2, the reflector 8 is disposed on the left side of the applicator 2 with the electric wire 20 as a boundary, and the reflector 8 has a size larger than the outer diameter of the electric wire 20. And the central portion of the reflector 8 in the height direction is located at the same height as the electric wire 20.

  A horizontal laser beam (laser beam) 23 is applied to the core portion 21 of the reflector 8 or the electric wire 20 from the light projecting opening 18 on the lower side of the laser side length sensor 5, and reflected light (diffused) from the reflector 8 or the core portion 21. (A part of the reflected light) 24 and 25 are incident on the upper light receiving opening 18 in an inclined manner. The reflected lights 24 and 25 are incident on a light receiving element (not shown) of the light receiving section, and are input from the light receiving section to the laser sensor amplifier 26 in FIG. 3 so that the distance from the laser sensor sensor 26 to the reflector 8 or the core section 21 is increased. It is calculated by trigonometry (Pythagorean theorem), and it is determined whether or not the distance to the core wire portion 21 satisfies the reference value.

  The reflector 8 is for determining the background reference, and the distance from the laser side length sensor 5 to the core wire portion 21 is accurately measured with respect to the background reference. The background reference and the reference value (with tolerance) of the distance to the core portion 21 are input to the laser sensor amplifier 26 in advance by operating the set button 27 of the laser sensor amplifier 26 (FIG. 3) while irradiating the laser beam 23. Is done. The laser sensor amplifier 26 includes an amplifier circuit using a transistor, an arithmetic circuit, and the like.

  When the reflector 8 is not used, the laser beam 23 is irradiated onto the complicated shape portion of the applicator 2 and the retroreflection is not stable and diffusely reflected. Therefore, there is a risk of erroneous detection. Accurate distance measurement without error is possible. The reflector 8 is preferably a white resin material or metal material having good light reflectivity.

  Since the reflector 8 is farther away from the core part 21 than the laser side length sensor 5, the reflection angle of the reflected light 24 of the laser beam 23 with respect to the reflector 8 is the reflection of the reflected light 25 of the laser beam 23 with respect to the core part 21. Smaller than the angle (the reflection angle of the reflected light 25 with respect to the core portion 21 is larger than the reflection angle of the reflected light 24 with respect to the reflector 8).

  As the light receiving element of the laser side length sensor 5, a two-dimensional CMOS type is preferable in that it can cope with a decrease in the amount of received light and uneven color of an object. A plurality of CMOS light receiving elements (not shown) are arranged in parallel, and the light receiving elements that receive light change according to the reflection angles of the reflected lights 24 and 25. In the case 19 of the laser side length sensor 5, a lens (not shown) is disposed between the light receiving port 18 and the light receiving element and between the light projecting port 17 and the light projecting unit main body.

  As shown in FIGS. 2 and 4, the electric wire 20 is set on the terminal 28 (FIG. 2) on the anvil 6, and the electric wire 20 is positioned by abutting the tip of the core wire portion 21 against the electric wire positioning plate 7. . The core wire portion 21 is positioned between a pair of left and right crimping pieces 28a on the front side of the terminal 28 (the tip portion 21a of the core wire portion 21 protrudes forward from the pair of crimping pieces 28a on the front side) and is insulated following the core wire portion 21. The covering portion 22 is positioned between a pair of left and right crimping pieces 28b on the rear side of the terminal 28. The terminal portion of the electric wire 20 composed of the core wire portion 21 and the insulating covering portion 22 is supported by the terminal 28, and the terminal 28 is the anvil 6 Supported by A male or female electrical contact portion (not shown) of the terminal 28 is positioned on the front side of the wire positioning plate 7, and the wire positioning plate 7 is positioned between the electrical contact portion and the pair of crimping pieces 28 a on the front side. To do.

  As shown in FIG. 4, the laser beam 23 from the laser side length sensor 5 is applied to the tip end portion 21 (portion protruding forward from the front crimping piece 28 a) of the core wire portion 21. The distance L1 between the laser beam 23 and the electric wire positioning plate 7 is, for example, about 0.5 mm although it depends on the diameter of the electric wire 20. This distance L1 is within the tolerance of the position reference of the tip 21a 'of the core wire portion 21. The diameter of the laser beam 23 is smaller than the distance L1 and is, for example, about 0.3 mm depending on the type of the laser side length sensor 5.

  The laser beam 23 hitting the tip portion 21a of the core wire portion 21 is reflected at a larger reflection angle than that in the reflector 8 as shown in FIGS. 1 and 2, and enters the light receiving portion (represented by reference numeral 18). The laser sensor amplifier 26 determines whether or not the distance to the core wire portion 21 is within the tolerance range of the reference value. If the reference value is satisfied, the crimpable lamp 30 and the foot switch (crimping) via the control relay 29 in FIG. When the operator steps on the foot switch 31, the ram 10 of the crimping machine 1 descends and the crimper 11 at the tip of the ram and the lower anvil 6 are connected. In the meantime, the electric wire 20 is crimped to the terminal 28.

  In FIG. 4, when the tip 21a 'of the core wire portion 21 is separated from the wire positioning plate 7 by a reference distance (with a gap), the laser beam 23 passes through the core wire tip 21a' and the reflector 8 (FIG. 2). ), The displacement of the electric wire 20 is detected, the lamp 30 in FIG. 3 is not turned on, and even if the foot switch 31 is stepped on, the crimping machine 1 does not operate.

  In FIG. 3, reference numeral 31 is a DC 24V power source, 32 is a power circuit for connecting the power source 31, the laser sensor amplifier 26 and the control relay 29, and 33 is the laser side length sensor 5, the laser sensor amplifier 26, the control relay 29 and the lamp 30. , A control circuit for connecting the foot switch 31, 34 a threshold value display section of the amplifier 26, and 35 a measured value display section.

  The output of the light receiving element of the laser-side length sensor 5 that has received the reflected light 25 from the core wire portion 21 is sent to the laser sensor amplifier 26, where the distance to the core wire portion 21 is calculated by arithmetic processing using trigonometry. Is compared with a threshold value (reference value), and when the reference value is satisfied, the crimpable lamp 30 is turned on via the control relay 29, and at the same time, the foot switch 31 and the motor of the crimping machine 1 (not shown) are connected via the control relay 29. ) Is connected, and when the foot switch 31 is stepped on, the crimping machine 1 operates. When the reference value is not satisfied, the control relay 29 does not operate, the crimpable lamp 30 does not light, the foot switch 31 and the motor of the crimping machine 1 are cut off via the control relay 29, and the foot switch 31 is stepped on. But the crimping machine 1 does not work.

  As shown in FIG. 2, the tip of the core portion 21 of the electric wire 20 is brought into contact with the right end of the rear surface 7a of the horizontally long rectangular electric wire positioning plate 7, and the rectangular reflector is arranged near the left end of the rear surface 7a of the electric wire positioning plate 7. 8 is fixed by bonding, screwing or the like, and the electric wire positioning plate 7 is fixed by screw tightening 38 to the lower end of the left fixed guide portion 37 that guides the ram 10 of the applicator 2 with the bracket 36. Since the reflector 8 is fixed to the electric wire positioning plate 7 as a reference for the electric wire 20, there is no variation in the background reference of the reflector 8 with respect to the core wire portion 21, and the distance to the core wire portion 21 is accurately measured. .

  The electric wire positioning plate 7 of this example is a fixed type, but the reflector 8 is fixed to the electric wire positioning plate 7 even when the electric wire positioning plate 7 is a rotating type as in the examples of the conventional patent documents 2 and 3. It is possible.

  In FIG. 2, reference numeral 39 denotes an existing reverse V-shaped electric wire presser disposed close to the rear of the crimper 11, and 28 denotes a terminal (terminal main body portion of the horizontal chain terminal 13 in FIG. 1). The terminal 28 is set on the anvil 6 along the guide plate 40. The crimper 11 descends close to the rear of the wire positioning plate 7. The crimper 11 is composed of a crimper for crimping the core wire on the front side and a crimper for crimping the insulation coating on the rear side. In the specification, the front, rear, left, and right directions are for convenience of explanation. With the operator holding the electric wire 20 by hand, the terminal 28 is crimped by the crimper 11 and at the same time the anvil 6 descends slightly against the upward biasing spring (not shown), and the chain of the horizontal chain terminal 13 ( (Not shown) is cut at the edge portion (not shown) of the block 12 adjacent to the anvil 6. These constituent actions are known.

  In the present invention, as shown in FIGS. 1 to 3, by using the laser side length sensor 5 as the electric wire positioning detection device of the crimping machine 1, the presence or absence of the core wire portion 21 against the electric wire positioning plate 7 (core wire portion 21. (Positional deviation in the front-rear direction), as well as the positional deviation in the vertical and horizontal directions of the core portion 21 can be measured.

  That is, as shown in FIG. 5A, when the core wire portion 21 is displaced downward as shown by a chain line with respect to the normal position of the solid line, the light emitting portion of the laser side length sensor 5 (FIG. 2) (substitute with reference numeral 17). Since the laser beam 23 from the laser beam 23 is constant (horizontal), the upper end portion of the core wire portion 21 that is displaced downward with respect to the reflected light 25 that is reflected obliquely upward by hitting the right end of the center portion in the height direction of the core wire portion 21 at the normal position. When the laser beam 23 hits (irradiates), the distance from the laser side length sensor 5 to the core wire portion 21 is increased by the L2 dimension, the reflection angle of the beam 25 ′ is reduced, and this dimension calculated by the trigonometric method. (A value obtained by subtracting the reference length from the actually measured side length) The laser sensor amplifier 26 determines whether or not L2 is appropriate for the positional deviation reference value in the vertical direction previously input to the laser sensor amplifier 26 (FIG. 3). Meet the reference value. 3, when the lamp 30 in FIG. 3 is lit and the foot switch 31 is stepped on, the crimping machine 1 is operated, and when the reference value is not satisfied, the lamp 30 in FIG. 3 is not lit and the foot switch 31 is stepped on. But the crimping machine 1 does not work.

  This is the same even when the core wire portion 21 is displaced upward with respect to the reference position in FIG. 5A, and the laser beam 23 strikes the lower end portion of the core wire portion 21 displaced upward so that the laser beam The distance from the side length sensor 5 to the core portion 21 is increased (the reflection angle of the beam 25 ′ is decreased), and the same determination as described above is made by collation with the reference value.

  Further, as shown in FIG. 5B, when the core wire portion 21 is displaced to the left like the chain line with respect to the normal position of the solid line, the laser beam 23 from the light emitting portion of the laser side length sensor 5 is constant (horizontal). Therefore, the laser beam 23 strikes (irradiates) the right end of the core portion 21 displaced to the left with respect to the reflected light 25 reflected obliquely upward when it hits the right end of the center portion 21 in the height direction of the core portion 21 at the normal position. Therefore, the distance from the laser side length sensor 5 to the core wire portion 21 is increased by the L3 dimension (the reflection angle of the beam 25 ″ is decreased), and this dimension calculated from the trigonometry (from the measured side length to the reference length) When the laser sensor amplifier 26 determines whether or not the value L3 is appropriate with respect to the positional deviation reference value in the horizontal direction input in advance to the laser sensor amplifier 26 (FIG. 3), and satisfies the reference value. The lamp 30 in FIG. Lights crimping machine 1 is operated by foot switch 31, in the case does not satisfy the reference value, the lamp 30 is not lit, crimping machine 1 also the foot switch 31 is not operated.

  This is the same even when the core part 21 is displaced to the right with respect to the reference position in FIG. 5B, and the laser beam 23 hits the right end of the core part 21 displaced to the right. The distance from the laser side length sensor 5 to the core wire portion 21 is shortened (the reflection angle of the beam 25 ″ is increased), and the same determination as described above is made by collation with the reference value.

  The positional deviation in the vertical direction of the core wire portion 21 in FIG. 5 (a) and the positional deviation in the horizontal direction of the core wire portion 21 in FIG. 5 (b) can occur simultaneously, and further, FIG. 4) and the misalignment of the core wire tip 21a 'in FIG. 4 can occur simultaneously. In these cases, the laser sensor amplifier 26 makes the same determination as above, and the core wire portion In the case of the misalignment failure 21, the lamp 30 notifies that there is a misalignment, and the operator resets the electric wire 20 again and corrects the misalignment of the core wire portion 21, whereby the terminal 28 and the electric wire 20. The reliability of pressure bonding can be improved.

  In the above embodiment, the wire position detecting device (laser side length sensor 5, reflector 8, and laser sensor amplifier) is added to the crimping machine 1 of manual type (the supply of the terminal 28 is automatic and the supply of the electric wire 20 and the crimping drive is manual). However, it is also possible to apply the same wire position detection device as described above to a crimping machine of an automatic type (the supply of the terminal 28 and the wire 20 and the crimping drive is automatic). It is. Also in this case, the crimping machine 1 can be stopped simultaneously with the determination of the displacement of the core wire portion 21.

  In addition, the above-described configuration of the present invention is effective not only as a wire position detection device for a terminal crimping machine but also as a method for detecting a wire position of a terminal crimping machine.

  The electric wire position detection device of the terminal crimping machine according to the present invention is, for example, in a manual type terminal crimping machine, when the worker detects the positional deviation of the core portion of the electric wire when the electric wire is set and the positional deviation is large. By not crimping the terminal to the electric wire, it can be used to increase the reliability of the crimping connection between the terminal and the electric wire.

DESCRIPTION OF SYMBOLS 1 Terminal crimping machine 5 Laser side length sensor 6 Anvil 7 Electric wire positioning board 8 Reflector 11 Crimper 20 Electric wire 21 Core wire part 21a Tip part 23 Laser beam 24,25 Reflected light 26 Laser sensor amplifier 28 Terminal 29 Control relay 30 Crimpable lamp 31 Foot Switch (crimping machine drive switch)

Claims (2)

  Background reference setting fixed to the electric wire positioning plate in a terminal crimping machine comprising an anvil for arranging a terminal, a crimper capable of moving up and down, and an electric wire positioning plate that abuts the tip of a core portion of an electric wire set on the anvil And a laser-side length sensor that receives each reflected light by irradiating the reflector or the tip of the core portion before the reflector with a laser beam. Position detection device.   2. The laser side length sensor is connected to a laser sensor amplifier, the laser sensor amplifier is connected to a control relay, and the control relay is connected to a crimpable lamp and a crimping machine drive switch. Electric wire position detection device for the terminal crimping machine.

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