JPH07146310A - Cross-coil type indicating instrument and method for assembling the same - Google Patents

Abstract

PURPOSE:To easily and accurately mount a movement on a wiring board and to appropriately cope with the automation of the assembly of the movement. CONSTITUTION:A movement 1 is constituted by housing a coil bobbin 3 in a case body 2 and winding a coil 12 around the bobbin 3 and, at the same time, forming a flange section 5 which is protruded from the case body 2 on the periphery of the bobbin 3 and arranging a terminal 6 connected to one end section of the coil 12. Then a guide hole 15 into which the guide jig 14 of an assembling device is inserted is bored into the flange section 5 of the bobbin 3 and forming a positioning projection 19 on the bobbin 3. In addition, a guide hole 10 into which the front end section of the jig 14 is inserted is bored into a wiring board 9 at the position which comes to correspond to the guide hole 15 of the flange section 5 when the movement 1 is assembled on the board 9 and a positioning hole 20 is bored into the board 9 at the position corresponding to the projection 19. Moreover, a terminal holes 11 is bored into the board 9 at the position corresponding to the terminal 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-coil type indicator and its assembling method, and more particularly to a cross-coil type indicator and its assembling method suitable for automobile speedometers and the like.

[0002]

2. Description of the Related Art Conventionally, a magnet rotor is caused to flow in a direction of a synthetic magnetic field obtained by synthesizing magnetic fields generated by the pair of coils by flowing currents that change according to a measurement amount into a pair of coils generating mutually orthogonal magnetic fields. Rotate
A cross-coil type in-vehicle indicating instrument is often used in which a measured amount is displayed by a pointer that rotates together with the magnet rotor.

FIG. 6 shows such a conventional cross-coil type indicating instrument. The movement 1 of the indicating instrument is as follows.
It has a cylindrical case body 2 with an open upper end,
A coil bobbin 3 is housed inside the case body 2. Two coils (not shown) are wound around the coil bobbin 3 so as to be orthogonal to each other. The coil bobbin 3 is provided with a disc-shaped magnet rotor (not shown) disposed inside each coil at the center thereof. The attached pointer shaft 4 is rotatably arranged.

Further, flange portions 5, 5 projecting outward from the case body 2 are integrally formed at diametrically symmetrical positions of the peripheral edge portion of the coil bobbin 3, and each of the flange portions 5 has Two pin-shaped terminals 6 and 6 connected to the ends of the respective coils and extending below the case body 2 are provided. Further, each of the flange portions 5 is integrally formed with a substantially columnar guide protrusion 7 that extends substantially parallel to the terminals 6 and has a length protruding from the lower surface of the case body 2. The guide protrusions 7 are arranged symmetrically with respect to the center of the coil bobbin 3.

Movement 1 constructed as described above
Is fixed to the upper surface of a wiring board 9 on which various electric components (not shown) and a wiring pattern 8 for converting a measurement signal into a predetermined drive signal are arranged, by a fixing screw (not shown). Is formed with a guide hole 10 into which the guide protrusion 7 is inserted, and is connected to the wiring pattern 8 at a position corresponding to the terminal 6 in a state where the guide protrusion 7 is inserted into the guide hole 10. The formed terminal hole 11 is formed.

Then, the movement 1 is held by a predetermined assembling device and the guide projection 7 of the movement 1 is fitted into the guide hole 10, whereby the movement 1 is positioned, and thereby the movement 1 is positioned. Terminal 6
Is inserted into the terminal hole 11, and then the end portion 6a of the terminal 6 protruding from the terminal hole 11 to the lower surface of the wiring board 9 is connected to the wiring board 9
Predetermined electrical connection is made by connecting and fixing to the wiring pattern 8 with solder or the like.

[0007]

However, in the above-mentioned conventional indicating instrument, the positioning of the movement 1 is performed by inserting the guide projection 7 formed integrally with the flange portion 5 into the guide hole 10 of the wiring board 9. Is to do
When the movement 1 is held and conveyed, the flange portion 5 may be deformed or distorted, and the orientation of the guide protrusion 7 may change, so that the guide protrusion 7 is properly inserted into the guide hole 10. It has the inconvenience that it cannot be done.

Even if the guide protrusion 7 can be fitted into the guide hole 10, the movement 1 cannot be accurately positioned, and the terminal 6 cannot be properly inserted into the terminal hole 11. Not only does this lead to breakage of the terminal 6, but there is the inconvenience that the subsequent steps of mounting the light guide plate, dial plate, or hands cannot be properly performed.

The present invention has been made in view of the above-mentioned points, and it is possible to easily and accurately attach the movement to the wiring board, and to appropriately cope with automation of movement assembly. It is an object of the present invention to provide a coil type indicating instrument and a method for assembling the same.

[0010]

In order to achieve the above object, a cross-coil type indicating instrument according to the invention described in claim 1 accommodates a coil bobbin inside a case body, and has a pointer shaft inside the coil bobbin. A magnet rotor is provided, and a coil is wound on the outside of the coil bobbin, and a flange portion projecting outward of the case body is formed on a peripheral portion of the coil bobbin, and one end portion of each coil is formed on the flange portion. A cross-coil type indicator instrument in which a terminal connected to is arranged to form a movement, the movement is fixed to the upper surface of a wiring board, and the other end of the terminal is connected to the wiring board. The flange portion of the coil bobbin is provided with a guide hole into which a guide jig of an assembling device is inserted, and a positioning protrusion is provided on the coil bobbin. A guide hole into which the tip end of the guide jig is inserted is formed at a position corresponding to the guide hole when the movement of the wiring board is assembled, and the guide hole corresponds to the positioning protrusion of the wiring board. A positioning hole is formed at a position corresponding to the terminal, and a terminal hole into which the end portion of the terminal is inserted and connected is formed at a position corresponding to the terminal of the wiring board. .

According to a second aspect of the present invention, there is provided a method of assembling a cross-coil type indicating instrument, wherein a movement is provided with a cross coil for winding a coil around a coil bobbin and rotating a pointer by a predetermined angle by energizing a wiring board. In the method of assembling a cross-coil type indicator for fixing to the upper surface of the wiring bobbin, a guide hole is formed in a flange portion projectingly formed on the peripheral portion of the coil bobbin, and at the time of assembling the movement of the wiring board. A guide hole is formed at a position corresponding to the guide hole, a guide jig of an assembling device is inserted into the guide hole to hold the movement, and then the tip end of the guide jig is attached to the guide hole of the wiring board. It is characterized in that the movement is positioned with respect to the wiring board.

[0012]

According to the present invention, the guide jig of the assembling device is inserted into the guide hole of the flange portion to hold the movement, and then the tip end portion of the guide jig is inserted into the guide hole of the wiring board. Since the movement is positioned with respect to the wiring board, the guide jig itself is not deformed while the movement is held by the guide jig. Since it is not formed integrally with the part, the movement can be accurately positioned.

As a result, the terminals and the wiring board can be properly aligned, and finally the positioning protrusions of the movement are attached to the wiring board while the movement is positioned by the guide jig as described above. By press-fitting into the positioning hole, the positioning of the entire movement can be reliably performed, and the subsequent work of attaching the dial, pointers, etc. can be reliably performed.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show an embodiment of a movement of a cross-coil type indicating instrument according to the present invention. This movement 1 has a cylindrical case body 2 having an open upper end, A coil bobbin 3 is housed inside the case body 2.

The coil bobbin 3 has two coils 1
2, 2 are wound so as to be orthogonal to each other, and a disk-shaped magnet rotor 13 having an S pole and an N pole is arranged inside each coil 12. At the center of the magnet rotor 13, a pointer shaft 4 extending in the axial direction of the coil bobbin 3 and having a pointer (not shown) mounted at its tip is rotatably mounted.

Further, flange portions 5 projecting outward from the case body 2 are integrally formed at peripheral portions of the coil bobbin 3 at diametrically symmetrical positions, and each of the flange portions 5 has Two pin-shaped terminals 6 and 6 are provided on the left and right, respectively, which are connected to the ends of the coils 12 and extend below the lower surface of the case body 2. Further, in the present embodiment, the guide hole 15 into which the guide jig 14 for automatic assembly is inserted is provided at the tip of each flange portion 5.
The flange 5 is provided with a positioning hole 16 for a light guide plate (not shown) and a screwing hole 17 for fixing a dial plate (not shown).

A positioning hole 18 is formed in the lower surface of the case body 2, and the positioning hole 18 and a positioning protrusion 19 formed on the bottom surface of the coil bobbin 3 engage with each other to perform the positioning. The protrusion 19 projects downward from the bottom surface of the case body 2.

Movement 1 constructed as described above
Is fixed to the upper surface of the wiring board 9 on which various electric components and wiring patterns (not shown) for converting a measurement signal into a predetermined drive signal are arranged, and as shown in FIG.
A guide hole 10 into which the tip of the guide jig 14 is inserted is formed in the wiring board 9, and the wiring board 9 is also provided.
When the guide jig 14 is inserted into the guide hole 10, a terminal hole 11 connected to the wiring pattern is formed at a position corresponding to the terminal 6. Further, a positioning hole 20 is formed at a position of the wiring board 9 corresponding to the positioning projection 19 protruding from the case body 2, and a screw 21 for fixing the movement 1 is inserted into the wiring board 9. Screw holes 22 are formed.

Next, a method of mounting the indicating instrument of this embodiment on a wiring board will be described with reference to FIGS. 4 and 5.
Movement 1 and wiring board 9 configured as described above
Are respectively conveyed by the transfer lines 23, 23 which are moved in parallel, and an automatic assembly device (not shown) is arranged above each of the transfer lines 23.

When the movement 1 and the wiring board 9 have been conveyed to the predetermined positions, the conveying line 23 is stopped, and in this state, the guide jig 1 of the automatic assembling apparatus.
4 is lowered and inserted into the guide hole 15 of the movement 1. Then, the movement 1 is held by a holder 24 such as a vacuum jig or a chuck jig provided in the guide jig 14, and the guide jig 14 is moved to move the movement 1 to the wiring board 9.
Move above. (In the case of the present embodiment, the holder 2
4 is a vacuum jig having a vacuum tube 24a. )

After that, the guide jig 14 is lowered to insert the lower end portion thereof into the guide hole 10 of the wiring board 9 to position the movement 1. In this state, the holder 24 of the automatic assembling apparatus is fixed. By lowering and pushing the movement 1 downward, the terminal 6 is inserted into the terminal hole 11 of the wiring board 9, and the positioning protrusion 19 of the case body 2 is press-fitted into the positioning hole 20 of the wiring board 9 to move the movement. 1 is fixed.

Then, the guide jig 14 is moved up to the original position, and then each of the transport lines 23 is moved to move the next movement 1 to a predetermined mounting position and not to mount it. By moving the wiring board 9 and repeating the above operation, the movement 1 is automatically attached to the wiring board 9. Then, in a step (not shown), a screw 21 penetrating the screw hole 22 is screwed into the lower surface of the case body 2 from the lower surface side of the wiring board 9 to fix the movement 1 to the wiring board 9 and the terminal 6 The wiring pattern in the terminal hole 11 portion is fixed by solder or the like for electrical connection.

Therefore, in this embodiment, the movement of the movement 1 with respect to the wiring board 9 is determined by the guide jig 14 inserted into the guide hole 15 of the flange portion 5. Part 5
The movement of the movement 1 can be accurately performed without being deformed or the like unlike the guide protrusion integrally formed on the.

As a result, the terminal 6 and the terminal hole 11 of the wiring board 9 are formed.
And the positioning protrusion 1 of the movement 1 is finally placed in a state where the movement of the movement 1 is positioned by the guide jig 14 as described above.
By press-fitting 9 into the positioning hole 20 of the wiring board 9, the positioning of the entire movement 1 can be reliably performed, and the subsequent work of attaching the dial, pointers, etc. can be reliably performed. It is possible to properly cope with automation of attachment work. It should be noted that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made as necessary.

[0025]

As described above, the cross-coil type indicating instrument and its assembling method according to the present invention are arranged such that the movement of the wiring board is positioned by the guide jig inserted into the guide hole of the flange portion. Therefore, the movement can be accurately positioned. As a result, the terminals can be properly aligned with the wiring board, and the positioning protrusions of the movement are finally pressed into the positioning holes of the wiring board while the movement is positioned by the guide jig. As a result, the entire movement can be surely positioned, the subsequent work of attaching the dial, the pointer, etc. can be surely performed, and the automation of the assembling work can be appropriately dealt with.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a cross-coil type indicating instrument according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of a wiring board to which the movement according to the present invention is attached.

FIG. 4 is a perspective view showing a method of assembling the movement of the present invention.

FIG. 5 is a plan view showing a method of assembling the movement of the present invention.

FIG. 6 is a perspective view showing an assembling means of a conventional cross coil type indicator.

[Explanation of symbols]

 1 Movement 2 Case Body 3 Coil Bobbin 5 Flange Part 6 Terminal 9 Wiring Board 10 Guide Hole 11 Terminal Hole 14 Guide Jig 15 Guide Hole 19 Positioning Protrusion 20 Positioning Hole 24 Holder

Claims (2)

[Claims] 1. A coil bobbin is housed inside a case body, a magnet rotor having a pointer shaft is arranged inside the coil bobbin, and a coil is wound outside the coil bobbin, and the case is provided on the periphery of the coil bobbin. Forming a flange portion projecting outward of the body, arranging a terminal connected to one end portion of each coil in the flange portion to form a movement, and fixing this movement to the upper surface of the wiring board, In a cross-coil type indicating instrument in which the other end of the terminal is connected to the wiring board, a guide hole into which a guide jig of an assembling device is inserted is formed in the flange portion of the coil bobbin, and A positioning protrusion is formed on the coil bobbin, and the guide is provided at a position corresponding to the guide hole when the movement of the wiring board is assembled. While forming a guide hole into which the tip of the tool is inserted, a positioning hole is formed at a position corresponding to the positioning protrusion of the wiring board, and a position corresponding to the terminal of the wiring board, The end of the terminal is inserted,
A cross-coil type indicating instrument having a terminal hole to be connected. 2. A method of assembling a cross-coil type indicator for fixing a movement having a cross coil for winding a coil around a coil bobbin and rotating a pointer by a predetermined angle by energization on a top surface of a wiring board. A guide hole is formed in a flange portion projectingly formed on the peripheral edge of the wiring board, and a guide hole is formed in a position corresponding to the guide hole when the movement of the wiring board is assembled, and the guide hole is assembled in the guide hole. The guide jig of the device is inserted to hold the movement, and then the tip end of the guide jig is inserted into the guide hole of the wiring board to position the movement with respect to the wiring board. A method for assembling a cross-coil type indicating instrument characterized by.