JPH03218096A - Drive mechanism for component mounting head - Google Patents

Abstract

PURPOSE:To rapidly and effectively perform switching drive of component mounting heads by independently providing a cam shaft corresponding to the heads, and performing switching drive of the heads upon switching of the head through connection and disconnection of the cam shafts to and from a drive source. CONSTITUTION:Component mounting heads A, B have a plurality of component insertion shafts 10 to be driven by a plurality of cams of corresponding cam groups 1, 2. The shafts 10 are coupled to the free end of an operation lever 12 pivotally secured at one end by a shaft 11 via a pin 13. The lever 12 has a cam follower 14 on the way, which is brought into pressure contact with cams 3, 4 via a spring 15 operated at the lever 12, and the shafts 10 are vertically moved by rotatably driving the cam to insert the component. Clutches 6, 7 are suitably engaged or disengaged to drive or release the drive of component mounting heads A, B simultaneously upon engagement or disengagement of the clutches 6, 7 with high response.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a printed circuit for electronic components! Regarding the drive mechanism of the component mounting 2F used in a temporary mounting device, etc., in detail, it is a drive mechanism for a component mounting head in which a plurality of component mounting heads are individually driven by the rotation of each cam corresponding to each component mounting head. It is related to.

2. Description of the Related Art Conventional mechanisms of this type are required to be able to switch and use a plurality of component mounting heads when mounting various electronic components onto a printed circuit board.

In order to satisfy this requirement, a drive mechanism as shown in FIGS. 3 and 4 has conventionally been used which can switch and drive each component mounting head according to the necessity of its use. As shown in the figure, this device has a plurality of component mounting hesodes a that the component mounting device has.
, b are mounted on one cam shaft e.
=J, and the cam shaft e rotates the cam groups c and d simultaneously by transmission from the motor f via the timing belt g. In order for the simultaneously driven cam groups c and d to work only on the predetermined component mounting heads that are required at that time, each operating rehar k with the component insertion axis r of each component mounting head a and b An air cylinder h is operated between it and the peripheral fixed part. When the air cylinder h is supplied with air to the port i, it contracts so that the component mounting head a (b) can be brought into pressure contact with the cam c (d) and driven by it, and the port t-j When air is supplied to , it expands to move the component mounting head a (b) to a retracted position outside the action area of the cam c (d) and hold it so that it is not driven by the cam c (d). Therefore, by controlling the expansion and contraction of the air cylinder h, each part is mounted V.
'a and b) can be switched and driven, and component mounting heads a and b can be switched and used depending on the need at the time.

Problems to be Solved by the Invention In recent years, as component mounting apparatuses have become faster and more reliable, drive switching of component mounting heads has also been required to be faster and more reliable. However, in the conventional drive mechanism described above, since the drive is switched by an air cylinder, the biasing force to the cam decreases due to compressed air harakage or changes in the amount of air when the cam is displaced, resulting in a timing shift in the drive switching operation. It becomes a prisoner of over- and under-performance, and its reliability is still insufficient. In addition, in the conventional mechanism described above, in order to switch the drive of each component mounting head, it is necessary to operate the air cylinder h on each of the many movement levers k provided for each of them to control the expansion and contraction of all of them. It is a complicated and expensive structure with a large number of parts. Furthermore, the parts mounting hand that is not used is cam c (d
), that is, outside the maximum swing diameter of cam C (d), and can only be driven after being moved to the position where it is affected by cam C (d) when switching to the use position. No. The stroke for this purpose is high-speed operation - the shorter the better.To do this, it is necessary to maximize the radius of the cam at the origin position of the component mounting head, and the cam displacement allocation is constrained to achieve the best operation timing. That's difficult.

In view of the above-mentioned problems, the present invention provides an independent camshaft corresponding to each component mounting head, and performs drive switching when switching the use of the component mounting head by connecting/disconnecting the connection between each camshaft and the drive source. It is an object of the present invention to provide a drive mechanism for a component mounting head that can solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a drive mechanism for a component mounting head in which a plurality of component mounting heads are respectively driven by the rotation of respective cams corresponding to the plurality of component mounting heads. A plurality of camshafts for driving the component mounting heads by cams are separately provided corresponding to the component mounting heads, and connecting means that can be independently connected and disconnected is provided between each of these camshafts and its drive source, This device is characterized in that it is possible to switch the drive of the component mounting head by connecting and disconnecting the lower stages of each connection.

Preferably, the coupling means is a crassochi mechanism.

Function: As each connecting means is connected/disconnected, it individually connects/disconnects the connection between the corresponding camshaft and the drive source, so the cam on each camshaft and the component mounting head are constantly connected by springs, etc. By appropriately connecting and disconnecting each connecting means while leaving the connecting means in a drivable state, it is possible to drive and release each component bagging head with high responsiveness at the same time as the connecting and disconnecting operations of the connecting means. Further, since the component mounting head is released from driving without mutual interference while remaining in a drivable pressure contact state with the cam, restrictions on the displacement position of the cam relative to the component mounting head can be resolved.

Embodiment Below, a driving device for a component mounting head as an embodiment of the present invention shown in FIGS. 1 and 2 will be described.

As shown in FIG. 1, cam groups 1 and 2 for driving the component mounting heads A and B are attached to separate cam shafts 3 and 4, respectively. Each of the camshafts 3 and 4 is connected to one gear throat 5 from both the left and right sides thereof through crutch jaws 6 and 7 so as to be freely connected and disconnected. A motor 8 is connected to the gear door 5,
Each camshaft 3 via the gear head 5 and each clutch 6, 7.
, 4 to rotate. Therefore, each camshaft 3 by the motor 8
, 4 depends on the engagement and disengagement of clutches 6 and 7, and each camshaft 3 and 4 is
It is possible to drive one or both of them, or to release the drive.

Each component mounting hem F'A, B has a plurality of component insertion shafts 10 driven by a plurality of cams in the corresponding cam groups I, 2 (FIG. 2). Each component insertion shaft 10 is connected by a pin 13 to a free end of a working lever 12 whose one end is pivoted by a shaft 1l.

The operating gear 12 has a cam follower 14 in the middle, which causes the cam 3 and
(4), and the cam is rotated and swung up and down to move the component insertion shaft 10 up and down to perform a component insertion operation.

Here, each component mounting head A, 13 is used when only the component mounting head FA is required to mount various electronic components on a printed circuit board, when only the component mounting head I''B is required, or when the component mounting head I"B is required, or There are various cases in which both mounting heads A and B are required.

Such a situation can be dealt with by appropriately connecting and disconnecting the clutches 6 and 7. Specifically, while each clutch 6, 7 is connected/disconnected, the corresponding camshaft 3,
4 and the motor 8 side, the cams 1 and 2 on each camshaft 3 and 4 and each operating lever 12 of the component mounting heads A and B are always in pressure contact with each other and in a driveable state. To achieve the drive and release of each component mounting head 1''A, 13 with good responsiveness at the same time as the connection/disconnection operation of the cradles 6 and 7 by appropriately connecting and disconnecting the cradles 6 and 7 while leaving them in place. When the drive of the camshafts 3 and 4 is stopped, by applying the brakes 2l and 22 provided thereon, the camshafts 3 and 4 can be stopped at the same time as the drive is stopped.

Therefore, it is possible to quickly and reliably switch and drive the component mounting heads A and B in a component mounting device operated at high speed.

Effects of the Invention According to the drive device for a component mounting head of the present invention, as each connecting means is connected/disconnected, the connection between the corresponding camshaft and the drive source is individually disconnected, and each cam The cam on the shaft and the parts mounting section are connected to drive and release the drive of each component mounting throat by connecting and disconnecting each connecting means as appropriate while keeping the cam on the shaft in a state where it can be driven at all times with a spring etc. Since the connecting/disconnecting operation of the means is simultaneously achieved with good responsiveness and reliably, it can be applied to a component mounting apparatus operated at high speed, and can sufficiently satisfy the speed and reliability of operation.

In addition, when mounting each component, the drive and the cam that drives it remain in a press-contact state where they can be driven at all times, and the drive is released without mutual interference. Since the conventional constraints for quick drive switching are resolved, the radius of the cam at the origin position of the component mounting head can be set to the middle of the displacement, allowing the cam to be freely divided and achieving the best possible operation. It has the advantage of being easy to time.

Furthermore, in order to switch and drive each component mounting head appropriately,
It is sufficient to have the same number of clamps as the component mounting heads and to connect and disconnect them, resulting in a simple structure with a small number of parts and can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing a drive device for a component mounting head as an embodiment of the present invention, Fig. 2 is a side view, Fig. 3 is a schematic front view of a conventional example, and Fig. 4 is a side view. It is. A, B- 1. Component mounting head 1, 2. 1. Cam 3, 4. 1. Power arm shaft 6, 7.

Claims (2)

[Claims] (1) In a drive mechanism for a component mounting head in which a plurality of component mounting heads are driven by the rotation of respective cams corresponding to the plurality of component mounting heads, each component mounting head is Connecting means that can be independently connected and disconnected between each of these camshafts and its drive source are provided corresponding to the heads, and the driving of the component mounting head can be switched by connecting and disconnecting each connecting means. A drive mechanism for a component mounting head characterized by: (2) A drive mechanism for a component mounting head according to claim 1, wherein the connecting means is a clutch mechanism.