JP2514278B2 - Positioning mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a positioning mechanism.
More specifically, the present invention relates to a positioning mechanism suitable for use as a positioning mechanism for driving a tool stepwise in a component automatic insertion device or the like for automatically mounting components such as resistance elements on a printed circuit board.

[0002]

2. Description of the Related Art A component automatic insertion device used for mounting an electronic component (axial component) such as a resistor element having coaxial lead wires on a printed circuit board (for example, Japanese Utility Model Laid-Open No. 62-92685). No.), by simultaneously lowering a plurality of tools for cutting, bending, and inserting the lead wire and sequentially stopping and fixing them at respective predetermined positions,
Predetermined processing is applied to the lead wires of electronic components to enable automatic mounting on printed circuit boards. For example, as shown in FIG. 8, a shearing tool 10 for cutting the lead wire 105 of the electronic component 104 into a predetermined length by taping 106.
1, a bending tool 102 for bending the lead wires 105 aligned in a predetermined length at a predetermined interval, and an insertion tool 103 for inserting the bent lead wires 105 into the holes 108 of the printed circuit board 107 at the same time. Figure 8
As shown in (A) to (C), it is provided so as to be stopped at predetermined positions one after another and perform a series of processing.

In such a mechanism, as means for causing a plurality of tools to perform positioning at predetermined positions in sequence, for example, the means shown in FIGS. 9A and 9B can be considered. In the case of the mechanism of FIG. 9 (A), the first moving member 201 and the second moving member 202 to which the tools are respectively attached are held by the fixed guide member 203 so as to be movable in the vertical direction, while the second moving member is provided. The moving member 202 of the first moving member 20 is moved up and down by a driving means (not shown).
1 is always lowered by the spring force of the tension spring 205 stretched between the fixing member 204 and the fixing member 204.
The second moving member 202 is provided with an engaging pin 206 protruding toward the first moving member 201 side, and the first moving member 20
1 is provided with a long hole 207 that is long in the moving direction. Then, the engaging pin 206 of the second moving member 202 is passed through the elongated hole 207 of the first moving member 201, thereby
The moving member 201 and the second moving member 202 are engaged with each other in the moving direction so as to be interlocked with each other and can move independently of each other within a certain range within the elongated hole 207.
Therefore, when the second moving member 202 is pushed down by the driving means, the first moving member 201 connected to the second moving member 202 by the engaging pin 206 hooked on the upper edge of the elongated hole 207 springs. It receives power and descends together. Then, the fixing member 208 hits (stopper)
When the first moving member 201 comes into contact with 209, the first moving member 201 stops descending and is positioned. Further, when the second moving member 202 is lowered, the engaging pin 20
6 moves in the long hole 207 of the first moving member 201, and only the second moving member 202 further descends. Then, before or at the same time as the engagement pin 206 comes into contact with the lower edge of the elongated hole 207, the second moving member 202 is stopped from falling at a position determined by the driving means, and the second moving member 202 is positioned.

Further, in the mechanism shown in FIG. 9B, driving means 303 and 304 are provided for the respective moving members 301 and 302, and the two moving members 30 are driven by driving them separately.
1, 302 are moved at the same time, and one is positioned first and then the other is positioned later. For example, the first and second moving members 301 and 302 are connected to the guide member 3
05, the cam levers 311 and 312 are movably supported by the fixed member 306, and are connected to the moving members 301 and 302 via links 309 and 310 by two types of cams 307 and 308 having different displacement amounts and displacement positions. They are driven separately.

[0005]

However, as shown in FIG.
In the case of the mechanism (A), since the spring 205 is used as a part of the drive source of the first moving member 201, durability and positioning accuracy are affected by the deterioration over time. The force of the spring 205 causes the first moving member 20 to move.
Since the first moving member 201 is actuated, the first moving member 201 can move when an external force with a large load such as a galling or sticking between the guide member 203 and the first moving member 201 occurs. There is a problem that the tool cannot be positioned without it, and the tool may move when an upward force larger than the force of the spring 205 is applied to the first moving member 201 even after the positioning. Further, when the force of the spring 205 is increased, the first and second moving members 20 are correspondingly increased.
It is inevitable to increase the size of the entire mechanism such as 1,202, the engaging pin 206, the driving means, etc. to make it stronger.

Further, in the case of the mechanism shown in FIG. 9 (B), since the driving means 303, 304 are required for each moving member 301, 302, there is a problem that the mechanism is complicated and becomes large. Moreover,
When the two driving means 303, 304 are to be driven by one driving source such as the motor 313, the driving means 303, 304
304 For example, cams 307 and 308 and cam lever 311
Since the number of components such as 312, the links 309 and 310, and the return spring (not shown) increases and the inertia (inertial force) increases, the motor 313 that rotates the cam shaft 314.
It requires a large amount of torque and has the disadvantage that it cannot be increased in size.

An object of the present invention is to provide a positioning mechanism which can surely perform positioning without affecting external force.

[0008]

In order to achieve the above object, the positioning mechanism of the present invention comprises a first moving member having a concave portion extending long in a direction substantially perpendicular to the moving direction, and a first moving member which is inserted into the concave portion and fitted therein. An engaging member movable along the concave portion, and a driving means for moving the same in the same direction as the first moving member and engaging with the engaging member in the moving direction, and the engaging member along the concave portion. The engaging portion including a cam surface for applying a biasing force to move the engaging member and the engaging member come into contact when the cam surface moves in the concave portion and separates from the engaging portion, and the concave portion of the engaging member. A second moving member having a restricting portion for restricting movement along the second moving member, and the engaging member abuts when the engaging member is engaged with the engaging portion of the second moving member. Having a restricting part that restricts the movement along the recess Positioning including a cam surface that receives the engaging member and engages in the moving direction to fix and position the first moving member and to apply a biasing force to move the engaging member along the recess. And a fixing member having a portion.

[0009]

Therefore, when the driving means moves the second moving member in the predetermined moving direction, the first moving member moves through the engaging member.
Moving member is coupled to the second moving member and moves together. At this time, the movement of the engaging member engaged with the engaging portion of the second moving member is regulated by the regulating portion of the fixed member. Then, when the engaging member reaches the positioning portion of the fixed member, the engaging member is pushed out of the engaging portion of the second moving member by the cam surface of the second moving member and moves along the concave portion, and is fixed. The first moving member is fixed to the fixed member by engaging with the positioning portion of the member and positioned. After that, the second moving member is prevented from moving along the concave portion of the engaging member by the restriction portion of the second moving member, that is, the fixing member is prevented from being separated from the positioning portion of the fixing member, and only the second moving member can be moved. To do.
The second moving member moves to a predetermined position determined by the driving means and its movement is stopped.

On the other hand, when the second moving member is returned to its original position by the driving means, first, only the second moving member slides between itself and the engaging member, and the second moving member engages. When the portion reaches the position of the engaging member, the engaging member urged by the cam surface of the positioning portion of the fixed member moves to the engaging portion side of the second moving member and moves through the engaging member to the first position. The first moving member and the second moving member are connected and start moving together. At this time, the movement of the engaging member is restricted by the restricting portion of the fixed member, and the engaging member does not separate from the engaging portion of the second moving member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows the principle of the positioning mechanism of the present invention. This positioning mechanism includes a first moving member 2 having a recess 1 extending in a direction substantially perpendicular to the moving direction, and a recess 1
An engaging member 3 which is inserted into the recess 1 and is movable along the concave portion 1, a second moving member 4 which is moved in the same direction as the first moving member 2 by a driving means (not shown), and a second moving member. The fixing member 6 has a restricting portion (surface) 5 that restricts and guides the movement of the engaging member 3 when the member 4 moves, and includes a fixing member 6 that fixes the first moving member 2 at a predetermined position. This positioning mechanism moves the second moving member 4 in the moving direction by the driving means while moving the second engaging member 3 that moves in the recess 1 to the second position.
The movable member 4 or the fixed member 6 is engaged with the first movable member 2 to selectively connect them.

The engaging member 3 is a rod-shaped piece which can move in the recess 1 and simultaneously engage with the second moving member 4 or the fixed member 6, and a cylindrical roller such as a dowel pin is adopted. The engaging member 3 is provided such that one end thereof is housed in the recess 1 and can roll or slide in the recess 1. In the case of the present embodiment, cylindrical rollers are used as the engaging member 3, but the invention is not limited to rollers,
A sphere, a quadrangular prism, a polygonal prism, or the like can be used as long as it extends between two members.

The first moving member 2 includes the first moving member 2
Recess 1 consisting of a long hole extending in a direction substantially perpendicular to the moving direction of
Are formed. The recess 1 engages the first moving member 2 and the engaging member 3 in the moving direction of the first moving member 2, and in the case of the present embodiment, is formed by a bottomed oval groove. However, the present invention is not particularly limited to this, and it can be implemented even with a long hole penetrating in the thickness direction of the first member.

On the other hand, the second moving member 4 is provided with an engaging portion 7 for receiving the engaging member 3 moving in the recess 1. The engaging portion 7 is composed of, for example, a groove that is opened in the longitudinal direction of the concave portion 1, and the engaging member 3 is provided in the engaging portion 7.
Included is a cam surface 8 that biases the force pushing it out. The shape of the engaging portion 7 is not particularly limited to that shown in the drawing, but the contact surface 9 and the engaging member 9 which are engaged when the engaging member 3 moves on the regulating portion 5 of the fixing member 6. 3 is a V-shaped groove having at least a cam surface 8 that applies a force to push out from the engaging portion 7. Then, when the engaging member 3 engages with the engaging portion 7 of the fixed member 6 above the engaging portion 7 of the second moving member 4 (closer to the driving means side), the engaging member 3 A restriction portion 10 that restricts movement along the recess 1 is provided. The restriction portion 10 is constituted by, for example, a surface on which the engagement member 3 rolls or slides.

The fixed member 6 has an engaging portion 7 of the second moving member 4 when the first moving member 2 reaches a predetermined position.
A positioning portion 11 for receiving the engaging member 3 is provided. The positioning portion 11 is, for example, the second moving member 4
At least a cam surface 12 that is formed of a groove facing the engaging portion 7 and moves in the recess 1 with respect to the engaging member 3 and pushes out from the engaging portion.

The first moving member 2 and the second moving member 4
For example, as shown in FIG. 2, the engaging members 3 are arranged in the longitudinal direction (the direction orthogonal to the plane of the drawing), and the first moving member 2 is arranged at one end of the engaging member 3 and the first moving member 2 is arranged at the other end. 2 moving member 4
The fixing members 6 are arranged so as to face each other. Then, one end of the engaging member 3 engages with the concave portion 1 of the first moving member 2, and the other end engages with either the engaging portion 7 of the second moving member 4 or the positioning portion 11 of the fixed member 6. It is provided to get.

With the above construction, the positioning is performed as follows.

First, the second moving member 4 is driven by the driving means.
Is moved in a predetermined direction, for example, in the arrow direction shown in FIG. A motor, a cylinder or the like can be used as the driving means. The engaging member 3 is the engaging portion 7 of the second moving member 4.
It comes into contact with the cam surface 8 and the regulating portion 5 of the fixing member 6 and slides or rolls on the regulating portion 5 of the fixing member 6. Along with the movement of the second moving member 4, the first moving member 2 coupled via the engaging member 3 is also lowered. Then, when the first moving member 2 comes into contact with the hit (stopper) 14 fixed to the apparatus body 13 or the like, the positioning portion 1 of the fixing member 6
The engaging member 3 reaches 1 and the engaging portion 7 of the second moving member 4
The engagement member 3 moves in the recess 1 toward the positioning portion 11 by the action of the cam surface 8 and is pushed into the positioning portion 11 of the fixing member 6. Then, the first moving member 2 is pushed down while the engaging member 3 moves along the cam surface 12 of the positioning portion 11, and the first moving member 2 is brought into contact with the contact 14 to complete the positioning. Then, when the engagement between the engagement member 3 and the positioning portion 11 of the fixed member 6 is completed, the fixed member 6 is fixed to the first moving member 2 via the engagement member 3. Then, the tool 15 fixed to the first moving member 2 is positioned.

The above embodiment is one example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, depending on the shape of the groove of the positioning portion 11, the contact 14 provided on the apparatus main body side or the counterpart member can be omitted. For example, like the engaging portion 7, a member provided with the positioning portion 11, for example, an edge of the positioning portion 11 of the fixed member 6 may be provided with a contact portion protruding toward the mating member. Further, in this embodiment, the structure shown in FIG. 1 is the minimum unit, and it is also possible to combine a plurality of or a large number of them.

Further, when the second moving member 4 is moved by the driving means, the first moving member 2 is connected to the fixed member 6 side through the engaging member 3, so that the second moving member 4 is moved. Only one moves in the direction of the arrow in FIG. Then, the positioning is performed by stopping the driving means. The stop position of the second moving member is previously determined by the driving unit, and is detected by a sensor or the like provided on the driving unit side or near the tool 16 mounted on the second moving member 4.

Then, the driving means is reversed to the state shown in FIG.
When driven in the direction indicated by the arrow, only the second moving member 4 first starts moving in the direction indicated by the arrow. Next, when the contact surface 9 of the engaging portion 7 of the second moving member 4 strikes the engaging member 3 fitted in the positioning portion 11 of the fixed member 6,
The engaging member 3 is pressed against the cam surface 12 of the positioning portion 11 and pushed out toward the engaging portion 7 side of the second moving member 4. As a result, the engagement member 3 moves in the recess 1 and the second
The first moving member 2 is connected to the second moving member 4 by fitting into the engaging portion 7 of the moving member 4. Further, the connection relationship between the first moving member 2 and the second moving member 4 is such that the engaging member 3 slides or rolls on the restriction portion 5 of the fixed member 6 and the engaging portion of the second moving member 4. Since the second moving member 4 and the first moving member 2 move in the direction of the arrow, the second moving member 4 and the first moving member 2 return to their initial positions.

Next, a more specific example in which the positioning device of the present invention is applied to an automatic component insertion device is shown in FIGS. In this embodiment, two sets of the positioning device of the present invention are combined and applied to an automatic component insertion device, and three tools are moved at the same time to perform positioning.

In this positioning mechanism, a first moving member 21 to which a lead wire shearing tool (cutter) 26 is attached, a second moving member 22 to which a bending tool 27 is attached, and an insertion tool 28 are attached. The third moving member 23, the fixed member 20, the guide member 24 that holds the first moving member 21 movably in a predetermined direction, and the device body 25 that supports these members. A first engaging member 31 is provided between the first moving member 21, the second moving member 22, and the third moving member 23, and a fixed position between the second moving member 22 and the first moving member 21. A second engaging member 32 is provided between the member 20 and each of the first and second engaging members 3.
It is provided so that the moving members 21, 22, 23 are interlocked to predetermined positions by the movement of the moving members 1, 32 in the recesses 33, 34, and thereafter, only the arbitrary moving members are further moved. Further, the first moving member 21 on which the first engaging member 31 straddles is provided with a positioning portion 35, and the third moving member 23 is provided with an engaging portion 36. In addition, the second moving member 22 on which the second engaging member 32 straddles has the engaging portion 3
The fixing member 20 is provided with a positioning portion 38. Then, the recess 33 formed in the first moving member 21.
The second engaging member 32 housed in the second moving member 22 moves between the fixed member 20, the positioning portion 38, and the engaging portion 37 of the second moving member 22, and becomes a concave portion 34 formed in the second moving member 22. The first engaging member 31 accommodated is provided so as to move between the engaging portion 36 of the third moving member 23 and the positioning portion 35 of the first moving member 21. In addition, between the fixed member 20 and the second moving member 22, the second moving member 22 and the third moving member 22.
The guide roller 30 is installed between the third moving member 23 and the first moving member 21, and between the first moving member 21 and the guide member 24. The first, second and third moving members 21, 22, 23 are attached to the gantry body 25 so as to be able to move smoothly in the same direction. In addition, the device body 25 includes the first moving member 2
A hitting portion (stopper) 43 for positioning 1 is provided, and a hitting portion 44 for positioning the second moving member 22 is formed on the first moving member 21. The positioning of the third moving member is usually performed by the driving means. Further, reference numerals 39, 40, 41 and 42 are restricting portions.

A cutter 26 is provided on the bottom surface of the first moving member 21, a bending tool 27 is provided on the bottom portion of the second moving member 22, and an insertion tool 2 is provided on the bottom portion of the third moving member 23.
8 are fixed respectively. The tip 29 of the driving means is fixed to the third moving member 23, and the driving means 29
The third moving member 23 is directly driven by and can be moved in a predetermined direction, that is, in the arrow direction shown in FIGS. 6A and 6B guided by the guide roller 30.

Further, the first moving member 21 and the second moving member 22 are formed with concave portions 33 and 34, which are long holes extending in a direction perpendicular to the moving direction thereof, and one end is accommodated in the concave portions 33 and 34. By the cylindrical roller-shaped first and second engaging members 31 and 32, the engaging portions 36 and 37 of the second moving member 22 and the third moving member 23 or the fixing member 20 and the first
It is provided so as to be selectively engaged with any of the positioning portions 35 and 38 of the moving member 21 and have a connection relationship in the moving direction, and be interlocked or fixed. In the present embodiment, the first and second engaging members 31 and 32 are shown only one set each for the sake of convenience of explanation, but usually two or more sets are symmetrically arranged.

With the above construction, the third moving member 23 is moved to the position shown in FIG.
When pushed down in the direction of the arrow, the engaging member 32 that engages with the engaging portion 37 of the second moving member 22 and the engaging member 31 that engages with the engaging portion 36 of the third moving member 23 move to the first position. The first, second and third moving members 21, 22, 23 are connected and descend at the same time so that the cutter 26, the bending tool 27 and the insertion tool 28 are simultaneously directed toward the electronic component 45 and the shear block 47 below. It is moved (see FIG. 6 (A)). Then, the cutter 26 is the lead wire 4 of the electronic component 45.
When the position of the shear block 47 supporting 6 is reached, for example, the second engaging member 32 housed in the recess 33 of the first moving member 21 is engaged with the second moving member 22 as shown in FIG. It is pushed out by the cam surface 49 of the portion 37 and moves to the positioning portion 38 side of the fixed member 20. Then, the first moving member 21 is pushed down to a predetermined position and positioned by the movement of the second engaging member 32 pushed along the cam surface 51 of the positioning portion 38, and then the second engaging member 32 is pushed. After the fitting into the positioning portion 38 is completed, the first moving member 21 is fixed to the fixed member 20. The first moving member is positioned by abutting against the hitting portion 43 of the apparatus body 25 (see FIG. 6B). As a result, the cutter 26 cuts the lead wire 46 of the electronic component 45 into a predetermined length and bends the lead wire 46 slightly. Reference numeral 48 is a jig for supporting the electronic component 45.

Then, when the third moving member 23 is further pushed down, the first moving member 21 and the fixed member 20 are connected by the second engaging member 32, so that the second moving member 22 and Only the third moving member 23 descends together. Then, the recess 34 formed in the second moving member 23.
The first engaging member 31 housed in the third moving member 23
Of the first moving member 2 pushed by the cam surface of the engaging portion 36 of
1 is pushed into the positioning portion 35. At this time, the second moving member 22 is positioned by abutting against the hitting portion 44 on the first moving member 21 in the same manner as the movement of the first moving member 21 described above. Therefore, the bending tool 27 fixed to the second moving member 22 is pushed down to a predetermined position and is supported by the insertion tool 28 between the bending tool (not shown) installed at the predetermined position. Lead wire 4 of the electronic component 45
Bend 6 parts (see FIG. 7C).

Further, the third moving member 23 is driven by the driving means 29.
When pushed down by the first and second engagement members 3
First and second moving members 2 fixed by 1, 32
Only the third moving member 23 descends, leaving 1 and 22.
Then, the electronic component 45 held by the insertion tool 28 is inserted into a predetermined hole on a printed circuit board (not shown) and mounted. After that, although not shown, the portion sticking out of the printed board is bent by a bending jig or the like.

The return of each tool to the original position is performed by pulling up the third moving member 23 by the driving means 29. First, the first engaging member 31 is pressed against the cam surface of the positioning portion 35 of the first moving member 21 for every rotation of the engaging portion 36 of the third moving member 23, and the third moving member is moved from the positioning portion 35. The second moving member 22 is unlocked by moving the second moving member 22 into the engaging portion 36. At the same time, the third moving member 23 and the second moving member 22 are connected by the first engaging member 31 and lifted together. Then, the second engaging member 32 that engages the first moving member 21 and the fixed member 20 is pushed up by the hit portion 50 of the engaging portion 37 of the second moving member 21 to position the fixing member 20. 38 is pressed against the cam surface 51 of the positioning member 38 and the engaging portion 3 of the second moving member 22 is pressed.
7 to move the second engaging portion 32 to the first moving member 21.
And the fixing member 20 are disconnected. At the same time, the first moving member 21 and the second moving member 22 are connected to the second engaging member 3
Connect by 2. Then, together with the third moving member 23, the first and second moving members 21, 22 are returned to predetermined positions.

[0031]

As is apparent from the above description, in the positioning mechanism of the present invention, a plurality of moving members are fixed members and movable members which are straddling and movable members between them. Since they are selectively connected to and to be interlocked with or positioned, the positioning can be reliably performed without being affected by an external force other than the external force driving means. Further, by driving one moving member, all the moving members are interlocked and positioned and fixed at an arbitrary position, so that the driving unit is compact and simple.

[Brief description of drawings]

FIG. 1 is a principle view of a positioning mechanism of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view of a component insertion device that implements the positioning mechanism of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between an engaging member, an engaging portion, and a positioning portion of the positioning mechanism shown in FIG.

5 is an enlarged plan view of an essential part of FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is an explanatory view showing a state where the cutter is lowered to a predetermined position in the component insertion device of FIG.

FIG. 8 is an explanatory diagram showing an operating state of each tool in the component insertion device.

FIG. 9 is a schematic view of a conventional positioning mechanism that operates two moving members separately.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recessed part 2 1st moving member 3 Engaging member 4 2nd moving member 5 Restriction part 6 Fixing member 7 Engaging part 8 Cam surface 9 Restricting part 10 Restricting part 11 Positioning part 12 Cam surface

Claims (1)

(57) [Claims] 1. A first moving member having a recess extending in a direction substantially perpendicular to the moving direction, an engaging member which is inserted into the recess and movable along the recess, and the first member by a driving means. Engaging portion including the cam surface that moves in the same direction as the moving member and engages with the engaging member in the moving direction, and that provides a biasing force that moves the engaging member along the recess. A second moving member having a restricting portion that abuts when the mating member moves in the recess by the cam surface and separates from the engaging portion, and restricts movement of the engaging member along the recess. The engaging member has a restricting portion that abuts when the engaging member engages with the engaging portion of the second moving member, and restricts movement of the engaging member along the recess. A first moving member that receives the member and engages in the moving direction. And a fixing member having a positioning portion including a cam surface for applying a biasing force for moving the engaging member along the concave portion.