JPH0710600U - Screw drive - Google Patents

Abstract

(57) [Summary] [Object] To provide a screw transmission device capable of independently operating each movable member even when a plurality of movable members are provided on the same screw shaft. [Structure] Rod 14 of cylinder 14a of interrupting mechanism 14
When b is moved forward, rod 14b moves to screw nut 1
1 and the through holes 11b and 12b of the movable member 12,
The screw nut 11 is connected to the movable member 12. As a result, the screw nut 11 advances in the axial direction by the rotation of the screw shaft 10, and the movable member 12 moves along the screw shaft 10. Further, when the rod 14b of the cylinder 14a is retracted, the rod 14b moves into the through holes 11b, 12b.
And the connection state of the screw nut 11 and the movable member 12 is released. This allows the screw nut 1
1 does not move in the axial direction by rotating with the screw shaft 10, and the movable member 12 is in a stopped state even when the screw shaft 10 is rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw transmission device used as, for example, a transport mechanism of an electronic component mounting apparatus.

[0002]

[Prior art]

 Conventionally, this type of screw transmission device has a screw shaft 1 having a screw formed on the outer periphery thereof as shown in FIG. 7, a screw nut 2 screwed to the screw shaft 1, and a movable screw attached to the screw nut 2. A member 3 and a slide shaft 4 extending parallel to the screw shaft 1 are provided, and the movable member 3 slidably penetrates through the slide shaft 4 via a slide bush 4a. Further, the screw nut 2 is fixed to the movable member 3 by the bolt 5, and when the screw shaft 1 is rotated by the driving means (not shown), the screw nut 2 advances along the screw shaft 1 so that the movable member 3 moves. Has become.

[0003]

[Problems to be solved by the device]

 The screw transmission device is used, for example, in an electronic component mounting device, and the movable member 3 carries and positions the components. Further, a large number of movable members 3 are required in order to improve the efficiency of the manufacturing line. However, when a plurality of movable members 3 are provided on the same screw shaft 1 as shown in FIG. When is rotated, the movable members 3 move in the same direction and at the same speed, and the distances A and B between them are always constant. Therefore, when it is desired to make each movable member 3 independently operate, the screw shaft 1 and the dedicated driving means are required for each movable member 3, which leads to an increase in cost and an increase in size of the device. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to operate each movable member independently even when a plurality of movable members are provided on the same screw shaft. It is to provide a screw transmission device capable of performing.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a screw shaft having a screw formed on a peripheral surface thereof, a screw member that is screwed to the screw shaft, and a movable member that is engaged with the screw shaft. In a screw transmission device for moving a movable member along a screw axis by advancing the screwing member in the axial direction by rotation, an interrupting mechanism for arbitrarily connecting and disconnecting the screwing member and the movable member is provided. I have it.

[0006]

[Action]

 According to the screw transmission device of the present invention, when the screwing member and the movable member are brought into the connected state by the disconnecting mechanism, the screwing member advances in the axial direction by the rotation of the screw shaft, and the movable member moves along the screw shaft. Moving. Also, when the screwing member and the movable member are disengaged from each other by the interrupting mechanism, the screwing member rotates together with the screw shaft and does not move in the axial direction, and the movable member keeps rotating the screw shaft. It will be stopped.

[0007]

【Example】

 1 and 2 show a first embodiment of the present invention, and FIG. 1 is a perspective view of a screw transmission device. This screw transmission device includes a screw shaft 10 having a thread formed on its peripheral surface, a screw nut 11 screwed into the screw shaft 1, a movable member 12 engaged with the screw nut 11, and a parallel shaft along the screw shaft 10. A slide shaft 13 extending in the vertical direction and an interrupting mechanism 14 for connecting and disconnecting the screw nut 11 and the movable member 12.

The screw shaft 10 is composed of a ball screw or a slide screw, and can be rotated forward and backward around the shaft by a driving means (not shown).

The screw nut 11 is formed in a cylindrical shape, and a flange 11a is provided on the outer periphery thereof. Further, the flange 11a is provided with a large number of through holes 11b arranged at equal intervals in the circumferential direction.

The movable member 12 is formed in a plate shape, and the screw shaft 10 penetrates the upper end side thereof. An upper end side of the movable member 12 is arranged on one end side of the screw nut 11, and an L-shaped support piece 12 a extending from the movable member 12 is arranged on the other end side of the screw nut 11. That is, as shown in FIG. 2, the screw nut 11 is sandwiched between the upper end side of the movable member 12 and the support piece 12a, and both ends thereof are supported by the bearings 11c and rotatably engaged with the movable member 12. ing. Further, the movable member 12 is provided with one through hole 12b corresponding to the through hole 11b.

The slide shaft 13 is arranged below the screw shaft 10 at a distance, and slidably penetrates through the slide bush 13 a to the lower end side of the movable member 12.

The interrupting mechanism 14 includes a cylinder 14a driven by air or hydraulic pressure, and the cylinder 14a is attached to the outside of the support piece 12a. The rod 14b of the cylinder 14a extends to the inside of the support piece 12a through the through hole 12c of the support piece 12a, and when this is moved forward, the screw nut 11 and the movable member 12 are penetrated as shown by the chain line in FIG. The screw nut 11 is connected to the movable member 12 through the holes 11b and 12b. Further, when the rod 14b is retracted, the rod 14b is disengaged from the through holes 11b and 12b as shown by the solid line in the figure, and the connection state of the screw nut 11 and the movable member 12 is released.

In the screw transmission configured as described above, when the screw nut 11 and the movable member 12 are connected by the interrupting mechanism 14, the screw nut 11 is rotated in the axial direction by the rotation of the screw shaft 10. And the movable member 12 moves along the screw shaft 10. Further, when the screw nut 11 and the movable member 12 are disconnected from each other by the interrupting mechanism 14, the screw nut 11 rotates together with the screw shaft 10 and does not move in the axial direction, and the movable member 12 rotates the screw shaft 10. It will be stopped even if it is left.

As described above, according to the screw transmission device of the present embodiment, the screw mechanism 11 is provided with the interrupting mechanism 14 for arbitrarily connecting and disconnecting the screw nut 11 and the movable member 12, and the disconnecting mechanism 14 is disconnected. Since the movable member 12 can be stopped even when the screw shaft 10 is rotated, even if a plurality of movable members 12 are provided on the same screw shaft 10, the interrupting mechanism 14 for each movable member 12 is used. The movable members 12 can be individually moved or stopped by arbitrarily connecting or disconnecting the movable members 12.

3 and 4 show a second embodiment of the present invention, which is different from the above embodiment in the structure of the interrupting mechanism.

The disconnecting mechanism 15 shown in the figure includes a cylinder 15 a driven by air or hydraulic pressure, and the cylinder 15 a is mounted on a mounting plate 12 d provided on the side of the movable member 12. The rod 15b of the cylinder 15a penetrates the mounting plate 12d and extends between the movable member 12 and the support piece 12a, and a pad 15c facing the side surface of the screw nut 11 is attached to the tip thereof. That is, when the rod 15b is moved forward, the pad 15c is pressed against the side surface of the screw nut 11 as shown by the alternate long and short dash line in FIG. 4, and the screw nut 11 is connected to the movable member 12 by the frictional force. Moreover, when the rod 15b is retracted, the pad 15c is separated from the screw nut 11 as shown by the solid line in the figure, and the connection state of the screw nut 11 and the movable member 12 is released. A similar interrupting mechanism may be provided on the opposite side of the interrupting mechanism 15 so that the screen nut 11 is sandwiched between the pair of pads 15c.

FIG. 5 shows a third embodiment of the present invention, which is different from the above embodiment in the structure of the interrupting mechanism.

The interrupting mechanism 16 includes a cylinder 16a driven by air or hydraulic pressure, and the cylinder 16a is attached to the outside of the support piece 12a. The rod 16b of the cylinder 16a penetrates the support piece 12a and extends to the inside of the support piece 12a, and a pad 16c facing the one surface of the flange 11a of the screw nut 11 is attached to the tip thereof. Further, a rubber pad 16d facing the other surface of the flange 11a is attached to the movable member 12. That is, when the rod 16b is moved forward, the flange 11a is clamped by the pads 16c and 16d, and the screw nut 11 is connected to the movable member 12. Further, when the rod 16b is retracted, the pads 16c and 16d are separated from the flange 11a, and the connection state of the screw nut 11 and the movable member 12 is released.

Here, an electronic component automatic mounting apparatus using the screw transmission device will be described. That is, the mounting device shown in FIG. 6 includes a conveyer 20 that conveys a circuit board, first and second suction heads 21 and 22 arranged on the side of the conveyer 20, a transfer path of the conveyer 20, and each suction unit. A mounting table 23 that reciprocates between the operation paths of the heads 21 and 22. The suction heads 21 and 22 are attached to the same screw shaft 10 of the screw transmission device.

In this electronic component automatic mounting apparatus, the circuit board K 1 is first supplied by the conveyor 20 and positioned on the mounting table 23. Next, the mounting table 23 on which the circuit board K is placed moves to the operation paths of the suction heads 21 and 22, and the components are mounted by the suction heads 21 and 22. In this case, the first suction head 21 first sucks a predetermined component from the first component supply unit 24, moves it to the mounting table 23, and mounts the component on the circuit board K. At that time, the mounting table 23 is also slightly moved according to the component mounting position. Meanwhile, the second suction head 22 moves to the second component supply unit 25 and sucks a predetermined component from the second component supply unit 25. Next, when the first suction head 21 that has finished mounting the component on the circuit board K moves to the first component supply unit 24 to suck a new component, the second suction head 22 moves to the mounting table 23. To mount the parts. By repeating such operations by the suction heads 21 and 22, the mounting of the components on the circuit board K is completed.

Therefore, by using the screw transmission device of the present invention, as shown in the above operation example, the two suction heads 21 and 22 provided on the same screw shaft 10 are individually operated to mount the parts. Can be performed extremely efficiently, so that the device can be downsized and the cost can be reduced.

The present invention can be applied not only to the electronic component automatic mounting apparatus as described above, but also to various industrial machines.

[0023]

[Effect of device]

 As described above, according to the screw transmission device of the present invention, even if a plurality of movable members are provided on the same screw shaft, each movable member can be operated independently, so that the device can be downsized. Also, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a screw transmission device according to a first embodiment of the present invention.

FIG. 2 is a partially sectional plan view of a transmission device.

FIG. 3 is a perspective view of a screw transmission device according to a second embodiment of the present invention.

FIG. 4 is a plan view of the transmission device.

FIG. 5 is a plan view of a screw transmission device according to a third embodiment of the present invention.

FIG. 6 is a schematic plan view of an electronic component automatic mounting device using the screw transmission device of the present invention.

FIG. 7 is a perspective view of a screw transmission device showing a conventional example.

FIG. 8 is a side view of a screw transmission device showing a conventional example.

[Explanation of symbols]

10 ... Screw shaft, 11 ... Screw nut, 12 ... Movable member, 14, 15, 16 ... Intermittent mechanism.

Claims (1)

[Scope of utility model registration request] 1. A screw shaft having a thread formed on its peripheral surface, a screw member that is screwed to the screw shaft, and a movable member that is engaged with the screw member, and the screw member is rotated by the rotation of the screw shaft. A screw transmission device for moving a movable member along a screw shaft by advancing in an axial direction, comprising a disconnecting mechanism for arbitrarily connecting and disconnecting the screwing member and the movable member. Screw transmission device.