JP3397989B2 - Nozzle holding device for surface mounter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting machine for sucking and mounting a component by a nozzle member mounted on a movable component mounting head unit. The present invention relates to a nozzle holding device in a surface mounter in which a nozzle is selectively mounted according to a type. 2. Description of the Related Art Heretofore, a nozzle board for picking up and lowering components has been provided on a movable head unit so as to be able to move up and down, and is rotatable. 2. Description of the Related Art There is known a surface mounter to be mounted on the top. The nozzle member of such a mounting machine has conventionally been
For example has a structure shown in FIG. That is, a nozzle member 104 shown in FIG.
Is composed of a hollow nozzle shaft 103 attached to a head unit (not shown), a nozzle holder 101 provided at the lower end thereof, and a nozzle 102 detachably attached to the nozzle holder 101. The negative pressure for component suction is guided from the negative pressure supply source into the nozzle shaft 103 and acts on the tip of the nozzle 102. A plurality of types of nozzles 102 having different sizes, shapes, and the like at the tips are prepared in advance, and the nozzles 102 suitable for the type of component to be mounted are selectively mounted on the nozzle holder 101 and mounted. The nozzle 102 can be replaced in accordance with the type of component to be used. [0005] As shown in FIG. 1, for example, a structure in which the nozzle 102 is detachably attached to the nozzle 102 is provided at the lower end of the nozzle holder 101 with a hollow thin shaft 105 and left and right sides of the thin shaft 105. A leaf spring 106 for holding the nozzle is provided on both sides, and a held portion 107 having a fitting hole (not shown) corresponding to the thin shaft portion 105 is provided at the upper end of the nozzle 102. Have been. Then, the held portion 107 at the upper end of the nozzle 102 is externally fitted to the thin shaft portion 105, and the leaf spring 106 elastically abuts the outer periphery of the held portion 107 from both sides. It is designed to be held by a holder 101. [0006] According to the above-mentioned conventional structure, the thin shaft portion of the nozzle holder and the portion to be held by the nozzle are formed so that the nozzle can be easily attached to and detached from the nozzle holder. It is necessary to loosely fit the nozzle with a slight clearance. Therefore, even if the plate spring is used to hold the nozzle, it is difficult to prevent the rattle of the nozzle against the nozzle holder. Then, if such rattling of the nozzle occurs, there is a possibility that the mounting accuracy and the like may be adversely affected. As disclosed in JP-A-5-6679, a piezo actuator and a piezo sensor are provided as a nozzle mounting member in a nozzle holder case as a device for improving nozzle positioning accuracy. In addition to holding the nozzle by pressing the piezo sensor against the nozzle shaft from the periphery, the piezo actuator is driven according to the output of the piezo sensor to correct the minute displacement of the nozzle due to vibration transmitted from the outside. It has been known. However, in this device, although the nozzle position can be finely adjusted by the piezo actuator in the nozzle mounted state, no consideration is given to facilitating the attachment and detachment of the nozzle. SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a nozzle holding apparatus for a surface mounter which can easily prevent the nozzle from rattling with respect to a nozzle holder when the nozzle is mounted, while allowing the nozzle to be easily attached and detached. The purpose is to provide. [0009] The present invention SUMMARY OF THE INVENTION may, to a nozzle holder provided in the head unit for component mounting, a nozzle for sucking an electronic component, the nozzle holder and the nozzle
The negative pressure conducting passages respectively formed in
In a state, the nozzle holding device of the surface mounter detachably mounted, the lower end of the nozzle holder ,
With an opening communicating with the negative pressure passage of the nozzle holder
A nozzle fitting part to be fitted with the nozzle is formed,
A slit-shaped notch is partially provided in the
A piezoelectric element is interposed in the notch, and a voltage corresponding to
The nozzle fitting part expands and contracts due to expansion and contraction of the electric element,
Accordingly, the nozzle fitting portion has a play with respect to the nozzle.
Release nozzle detachable state and press fit to the above nozzle
It is configured to switch to the corresponding nozzle fixed state . According to this device, the piezoelectric element
Switching between the nozzle fixed state and the nozzle detachable state is performed by applying or cutting off the voltage . In the nozzle fixed state, the nozzle fitting portion is press-fitted to the nozzle to prevent rattling of the nozzle. Further, in the state where the nozzle can be detached, the nozzle fitting portion and the nozzle are separated, so that the nozzle can be easily detached. In particular , since the piezoelectric element can be small and lightweight, it is possible to avoid an increase in the mass of the nozzle member. Moreover, the response of the piezoelectric element in response to the application and cutoff of the voltage is fast, and the switching between the nozzle fixed state and the nozzle detachable state is quickly performed. [0012] Then, partially provided-out slit-shaped notch in the nozzle fitting portion of the nozzle holder, interposed piezoelectric element to this notch, the application of the voltage, the expansion of the piezoelectric element in response to the shut-off shrinkage When the nozzle fitting portion is configured to expand and contract according to the above, the nozzle fitting portion expands when the piezoelectric element expands in response to voltage application, and when the piezoelectric element contracts in response to the voltage interruption. The nozzle fitting portion is reduced. Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show an embodiment of the present invention. In these drawings, reference numeral 1 denotes a nozzle holder, and reference numeral 2 denotes a nozzle detachably attached to the nozzle holder 1. The nozzle holder 1 is fixed to the lower end of the hollow nozzle shaft 3 by screwing or the like. A nozzle member 4 is formed by the nozzle shaft 3, the nozzle holder 1 and the nozzle 2, and the nozzle member 4 is mounted on the head unit 5 so as to be able to move up and down and rotate (see FIG. 4). As shown in FIGS. 1 and 2, the nozzle holder 1 includes a cylindrical upper holding frame 8 and an upper holding frame 8.
And a cylindrical lower holding frame 9 that is slidably fitted in a vertical direction (axial direction) with respect to the upper holding frame 8. A spring 10 is provided between the stepped portion. A pair of guide holes 11 (a pair of right and left in FIG. 1) extending vertically is formed in the upper holding frame 8, and guide pins 12 are provided on the lower holding frame 9 so as to protrude radially on both sides. 12 protrudes into the guide hole 11. In this way, the lower holding frame 9 is vertically urged downward by the spring 10 and relatively movable up and down with respect to the upper holding frame 8 within a range permitted by the guide hole 11, and is prevented from rotating. ing. A hollow portion inside the nozzle holder 1 forms a passage 13 for conducting a negative pressure for sucking components. A nozzle fitting portion 14 is provided at a lower end portion of the lower holding frame 9, and the nozzle fitting portion 14 has a fitting hole 15 connected to the passage 13. On the other hand, the nozzle 2 has a shaft portion 17 fitted into the fitting hole 15 and a head portion 18 connected to the shaft portion 17, and the nozzle holder 1 is provided inside the shaft portion 17 and the head portion 18. A passage 19 for negative pressure conduction communicating with the passage 13 is formed. At the open end of the fitting hole 15 and the tip of the shaft 17, tapered portions 21 and 22 are formed to facilitate the fitting of the two. A corresponding engaging projection 23 and an engaging hole for positioning the nozzle 2 with respect to the nozzle holder 1 in the rotational direction are provided on the lower end surface of the peripheral wall of the nozzle fitting portion 14 and the upper end surface of the head 18 of the nozzle 2. 24 are provided. [0021] In order to allow the removable and fixed nozzle 2 relative to the nozzle holder 1, pressure conductive element 30 is incorporated into the nozzle fitting portion 14, application of a voltage, the expansion of the piezoelectric element 30 corresponding to the cutoff, the shrinkage Nozzle fitting part 14
Are configured to expand and contract. More specifically, a horizontal slit 31 is formed at a position corresponding to the boundary between the nozzle fitting portion 14 and the cylindrical portion above the lower holding frame 9 of the nozzle holder 1 over a half or more circumference. The slit 3 is formed in the peripheral wall of the nozzle fitting portion 14 in the longitudinal direction.
2, the nozzle fitting portion 14 has a structure capable of expanding and contracting. Further, by interposing the piezoelectric element 30 in the notch 32, when the piezoelectric element 30 expands in response to the application of a voltage, the nozzle fitting portion 14 is expanded by the force, and the piezoelectric element 30 cuts off the voltage. When contracted accordingly, the nozzle fitting portion 14 is reduced by the restoring force. When the piezoelectric element 30 is expanded, the diameter of the fitting hole 15 becomes large enough to allow the shaft 17 of the nozzle 2 to be loosely fitted.
So that the nozzle fitting portion 14 is reduced to such an extent that
These dimensions are set. The electric wire 33 connected to the piezoelectric element 30
Is drawn out above the nozzle shaft 3 through a passage inside the nozzle holder 1 and the nozzle shaft 3 and connected to an external energizing circuit. In addition, since the nozzle member 4 is driven at high speed in the vertical and rotational directions during mounting, it is necessary to perform wiring so that the rotation or the like does not cause fatigue, cutting, or the like of the electric wire. For example, as shown in FIG. 4, the electric wire 33 led out above the nozzle shaft 3 may be drawn out through a curl cord 34, or may be drawn out through a slip ring (not shown). . According to the apparatus of this embodiment as described above,
When attaching the previously separated nozzle 2 to the nozzle holder 1, first, a voltage is applied to the piezoelectric element 30 to expand the piezoelectric element 30 so that the nozzle fitting portion 14 is expanded.
Is expanded, and the fitting hole 15 of the nozzle fitting portion 14 is
The shaft 17 of the nozzle 2 is loosely fitted to the nozzle. At this time, the engagement protrusion 2
By engaging the engagement holes 3 with the engagement holes 24, the positioning of the nozzle 2 in the rotation direction with respect to the nozzle holder 1 is achieved. Then, when the voltage to the piezoelectric element 30 is cut off, the nozzle fitting portion 14 contracts as the piezoelectric element 30 contracts, so that the peripheral wall of the nozzle
And the nozzle 2 is fixed. In this fixed state, rattling does not occur between the nozzle fitting portion 14 and the nozzle 2, and operations such as lifting and lowering, rotation, and component suction of the nozzle 2 during mounting are performed well. When the nozzle 2 is removed from the fixed state, a voltage is applied to the piezoelectric element 30 in a state where the head unit 5 is located above the nozzle storage place or the like, so that the expansion of the piezoelectric element 30 is prevented. Accordingly, the nozzle fitting portion 14
Is expanded, and the nozzle is detached from the nozzle fitting portion 14. As described above, the nozzle 2 can be easily attached and detached, and the nozzle can be easily exchanged according to the mounted component. In particular, if the mounting machine is provided with a nozzle replacement station in advance and a plurality of types of nozzles 2 having different sizes and shapes of the heads 18 can be stored in the nozzle replacement station, the mounting parts When it becomes necessary to replace the nozzle according to the change of the nozzle, the head unit 5 is moved to the nozzle replacement station, and then the nozzle 2 is removed by applying a voltage to the piezoelectric element 30 as described above. While driving the head unit 5 and the nozzle member 4 so as to fit another nozzle in the nozzle replacement station to the nozzle fitting portion 14,
The nozzle 2 may be fixed by cutting off the voltage to the piezoelectric element 30. Such a nozzle replacement operation can be performed automatically. The specific structure of the device of the present invention is not limited to the above-described embodiment, but can be variously changed. Examples of the changes will be described below. In the above embodiment, the piezoelectric element 30 is interposed in the notch 32 provided at one position on the peripheral wall of the nozzle fitting portion 14, but as shown in FIG. Notches 32A, 32B, 32 at a plurality of places (for example, three places)
C may be provided, and the notch 32A, 32B, 32C may be provided with the piezoelectric element 30A, 30B, 30C, respectively. In this case, the piezoelectric elements 30A, 30B, 3
In order to apply a restoring force in the contracting direction to the nozzle fitting portion 14 at the time of contraction of 0C, a helical spring 35
It is desirable to attach. By doing so, the piezoelectric elements 30A, 30A
The extent of expansion and contraction of the nozzle fitting portion 14 due to expansion and contraction of B and 30C can be increased. FIGS. 6 and 7 show still another embodiment. In this embodiment, the shaft 17 of the nozzle 2 is fitted into the nozzle fitting portion 14 of the nozzle holder 1 in the opposite manner. Then, the upper part of the nozzle 2 is externally fitted to the nozzle fitting portion of the nozzle holder 1. That is,
A cylindrical portion 62 having a fitting hole 62a on the upper part of the nozzle 2.
On the other hand, a hollow shaft 61 is provided at the lower end of the nozzle holder 1, and the cylindrical portion 62 is attached to the shaft 61.
Are externally fitted. The shaft portion 61 of the nozzle holder 1 is provided with a vertical slit-shaped notch 63, and a piezoelectric element 60 is interposed in the notch 63. [0045] If according to this embodiment, when the cut off voltage to the piezoelectric element 60, as in FIG. 7 (a),
When the shaft portion 61 is reduced and the cylindrical portion 62 is loosely fitted to the shaft portion 61, the nozzle 2 can be attached and detached.
When a voltage is applied to the nozzle 2, as shown in FIG. 7 (b), the shaft 61 expands with the expansion of the piezoelectric element 60 and presses against the inner peripheral surface of the cylindrical portion 62, thereby causing the nozzle 2 to move. It will be fixed. The operating members provided on the nozzle holder 1 for switching between the nozzle fixed state and the nozzle detachable state by changing the shape in accordance with energy such as electricity, heat, and fluid pressure are as described above. In addition to the piezoelectric element shown in each embodiment, for example, a member having a large coefficient of thermal expansion such as a shape memory alloy, a metal that expands and contracts by thermal energy,
An air cylinder, an electromagnet or the like is conceivable. However, since the nozzle member mounted on the head unit of the mounting machine sucks the electronic component and mounts it on the printed board at a high speed, if the mass is large, the electronic component comes into contact with the printed board. At this time, there is a problem that an electronic component is broken by an impact. Therefore, the nozzle member is required to be as light as possible. From such a viewpoint, it is preferable to use a lightweight and small-sized piezoelectric element as the operating member. Further, if a piezoelectric element is used as the operating member, the nozzle member can be kept small, which is advantageous for reducing the overall size of the head unit even when a plurality of nozzle members are provided. Further, since the piezoelectric element has a rapid reaction of expansion and contraction in response to application and interruption of a voltage, it is advantageous in terms of shortening the time required for nozzle replacement. According to the present invention , the nozzle fitting portion is provided at the lower end of the nozzle holder provided in the head unit for mounting components.
Formed and partially slit-shaped notch in this nozzle fitting part
A piezoelectric element is interposed in this notch,
When the piezoelectric element expands and contracts in response to
The nozzle fitting part expands and contracts, and the nozzle fitting part
The nozzle is detachable from the nozzle
Switch to the nozzle fixed state where crimping fits to the nozzle
With such a configuration , rattling of the nozzle can be reliably prevented in the nozzle fixed state, and the nozzle can be easily attached / detached in the nozzle attachable / detachable state. Then, switching between Roh nozzle fixed state and the nozzle detachably state it is possible to perform automatically. [0049] Further, by providing the pressure-electronic device to the nozzle holder, especially, a nozzle member lightweight, can be kept small, together with this, it is possible to reduce the stress on the electronic components during component mounting, the head This is also advantageous when a unit is equipped with a plurality of nozzle members. In addition, since the response of the piezoelectric element in response to the application and cutoff of the voltage is fast, the efficiency of operation such as nozzle replacement can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of a nozzle holding device of the present invention. FIG. 2 is a side view of the nozzle holder. 3A and 3B are cross-sectional views of a nozzle fitting portion of a nozzle holder and a nozzle fitted to the nozzle fitting portion, wherein FIG. 3A shows a nozzle detachable state, and FIG. 3B shows a nozzle fixed state. FIG. 4 is a schematic view of the entire nozzle member and a head unit that holds the nozzle member. FIG. 5 is a transverse sectional view of a main part showing a modification of the embodiment shown in FIGS. 1 to 3; FIG. 6 is a perspective view of a main part showing still another embodiment of the device of the present invention. 7A and 7B are cross-sectional views of a nozzle fitting portion and a nozzle fitted to the nozzle fitting portion in the embodiment shown in FIG.
Indicates a nozzle detachable state, and (b) indicates a nozzle fixed state. FIG. 8 is a longitudinal sectional view showing a conventional nozzle holding device. [Description of Signs] 1 Nozzle holder 2 Nozzle 4 Nozzle member 5 Head unit 14 Nozzle fitting part 15 Fitting hole 17 Shaft part 30, 60 Piezoelectric element 32, 63 Notch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B25J 15/06 B25J 15/04 H05K 13/04

Claims (1)

(57) to the nozzle holder provided in Claims head unit 1. A component mounting, the nozzle for sucking an electronic component, the upper
Negative pressure formed on the nozzle holder and nozzle
What is claimed is: 1. A nozzle holding device for a surface mounter , which is detachably mounted in a state where communication paths are communicated with each other , wherein a negative pressure of the nozzle holder is connected to a lower end of the nozzle holder.
Nozzle that has an opening that communicates with the nozzle and fits with the nozzle
To form a nozzle fitting part, and
A notch, and a piezoelectric element is interposed in this notch,
Expansion and contraction of the piezoelectric element in response to application and interruption of voltage
The nozzle fitting portion expands and contracts, and accordingly, the nozzle fitting portion
Nozzle detachable state where the joint is released from the above nozzle
And the nozzle fixed state that fits tightly to the above nozzle
A nozzle holding device for a surface mounter, wherein the nozzle holding device is configured to be switched .