JPH03256910A - Parts carrying device - Google Patents

Abstract

PURPOSE:To increase a carrying stroke and improve the positioning accuracy of parts by moving a crossfeeding screw, to which a parts pinching device is installed freely to move, against a pair of parallel feeding screws with a nut so as to move the parts pinching device. CONSTITUTION:When a motor 16 is rotated to the arrow A direction, a first feeding screw 21 is rotated to the arrow A direction, and furthermore, a second feeding screw 22 is rotated to the arrow A direction through a wrapping and transmitting member 25. Consequently, a first and a second nuts 31, 32 move a nut 33 of a third feeding screw 23 to the arrow X1 direction smoothly at high speed. When a motor 18 is rotated to the arrow B direction, the third feeding screw 23 is rotated to the arrow B direction to move the third nut 33 to the Y1 direction. Consequently, a parts pinching device installed to a head fitting plate 34 is moved to the X1, Y1 direction. When the motors 16, 18 are respectively reversed to the C, D directions, the parts pinching device is moved to the reverse X2, Y2 direction. With this structure, a carrying stroke can be increased and the positioning accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a parts conveying device, and particularly to a component conveying device, in which a screw is provided at a position facing each other to first and second feed screws that are arranged parallel to each other and driven in synchronization. Pivotly connect both ends to the attached nut,
By disposing a third feed screw orthogonally to the first and second feed screws and disposing a component clamping device etc. on a nut screwed onto the third feed screw, large-sized parts can be easily removed. The present invention relates to a parts conveying device which can convey parts through any route at high speed and with high precision, and which is low in cost.

BACKGROUND OF THE INVENTION The most advanced conventional X-Y drive system component conveying device is shown in FIG. And rectangular frame 2
A feed screw device 3 is disposed on each of the four sides of the rectangular frame 2, and a drive motor 4 is connected to one feed screw device &3A mounted on each opposing two side of the rectangular frame 2.
The other feed screw device 3B is synchronized with the feed screw device 3A via a power transmission device 5 such as a bevel gear, for example.

The feed screw device 3 is composed of a feed screw 6 and a napft 8 screwed onto the feed screw, and a drive motor 4 such as a stevening motor or a servo motor is disposed at one end of the feed screw. The feed screw 6 is rotated by rotating the drive motor, and the nut 8 screwed onto the feed screw is moved in the axial direction of the feed screw 6.

A slider 9 in which a component clamping device, etc. is disposed has sliding holes 9a formed in directions perpendicular to each other, and the rods IOA and IOB fitted into the sliding holes have their ends facing each other. It is fixed to nut 8 located at.

As described above, the component transport device according to the conventional example has a structure in which the slider 9 is moved in the X and Y directions within a limited range of the rectangular frame 2, so that the components placed on the slider are moved easily. The movement range of the clamping device and the like is restricted, which may impede securing a transport route for the parts, and the usability is somewhat poor. Furthermore, the feed screw device 3 used in the conventional component conveying device, which aims to convey components at high speed and with high precision, is required to have high precision and excellent durability, and is rectangular. shape frame 2 of 4
Since the feed screw device W3 is provided on each side, at least four feed screws are required, which has the drawback of making the manufacturing cost extremely high.

Purpose The present invention has been made in order to eliminate the drawbacks of the prior art described above, and its purpose is to connect first and second feed screws arranged parallel to each other and the two feed screws. A U-shaped highly rigid frame is constructed by a power transmission device that synchronizes and drives the feed screws, and both ends are rotated by nuts screwed onto the first and second feed screws, respectively, facing each other. A freely supported third feed screw is disposed perpendicular to the first and second feed screws, and a component clamping device, etc. is fixed to a nut screwed onto the third feed screw. This greatly expands the movable range of the component clamping device toward the opening formed on one side of the U-shaped highly rigid frame, making it easier to secure a transportation route for the components. The aim is to increase the transport stroke of parts. Another purpose is to use the three
To eliminate variations in positioning accuracy depending on position within the movable range of a clamping device driven by a book feed screw, and to enable high-precision positioning with constant accuracy at all times. By reducing the number of feed screws by one and simplifying the mechanism compared to the above-mentioned conventional component conveying device, it is possible to provide a much cheaper component conveying device that has the same or better performance as the conventional example. That's true.

Configuration In short, the present invention provides a first feed screw device including a first feed screw formed of a predetermined lead and a first nut screwed onto the first feed screw; A second feed screw disposed parallel to the screw device and formed of the same lead; and a second nut screwed onto the second feed screw and disposed opposite to the first nut. a second feed screw device, a power transmission device that drives the second feed screw device in synchronization with the first feed screw device, and a power transmission device that drives the second feed screw device in synchronization with the first feed screw device;
a third feed screw that is orthogonal to the second feed screw and formed with a predetermined lead; and a third nut screwed onto the third feed screw. a third feed screw device whose both ends are rotatably supported by the first nut and the second nut, and connected to one end of the first feed screw and one end of the third feed screw, respectively. The invention is characterized in that it is equipped with a drive motor.

The present invention will be explained below based on embodiments shown in the drawings. In FIGS. 1 and 2, a component conveying device 15 according to the present invention includes a first feed screw device 11 and a second feed screw device 1.
2, a power transmission device 14, a third feed screw device 13, and a drive motor 16°18.

The first feed screw device 11 has both ends 19a of the frame 19.
, 19b are fixed at both ends of the first feed screw 21, and a first nut 31 screwed onto the first feed screw. A drive motor 16 such as a stamping motor or a servo motor is disposed at one end 21a of the screw 21. By rotating the drive motor 16, the first feed screw 2
1 is rotated, and the first nut 31 screwed onto the first feed screw is moved in the axial direction of the first feed screw 21.

Furthermore, a pair of guide rods 24 are fitted to the first nut 31 and are slidable in parallel with the I-th feed screw 21 .

Similarly, the second feed screw device 12 includes a second feed screw 22 whose both ends are supported by bearing stands 20 fixed to both ends 19a and 19b of the frame 19, and a second feed screw 22 which is screwed onto the second feed screw. The second nut 32 and the first nut 1-31 are synchronously connected to the first feed screw 21 and the second feed screw 1-3 by the power transmission device 14 at positions facing each other. It is adapted to move in the axial direction of the screw 22.

Further, a pair of guide rods 24 are fitted to the second nut 32 and are slidable in parallel with the second feed screw 22 .

The power transmission device 14 includes a winding transmission member 25 such as a timing belt, and a toothed rotating member 2 such as a pair of sprockets.
6 and an idle pulley 28, the winding transmission member 25 is wound around a toothed rotating member 26 that is fitted into one end 21a of the first feed screw 21 and one end 22a of the second feed screw 22, respectively. By adjusting the position of the idle pulley 28 which is hung and fixed to the frame 19, a predetermined tension is applied to the wrapped transmission member 25.

Further, the pair of toothed rotating members 26 are fixed to the first feed screw 21 and the second feed screw 22 with the first nut 31 and the second nut 32 facing each other at right angles to the frame 19. and the first nut 31 and the second nut 3
2 is a first feed screw 21 and a second feed screw 2 synchronously.
It is designed to move in the direction of the second axis.

The third feed screw device 13 has a first nut 31 and a second nut 31.
It consists of a third feed screw 23 whose both ends are supported by a bearing stand 29 fixed to a nut 32, and a third nut 33 screwed onto the third feed screw. A drive motor 18 such as a stamping motor or a servo motor is disposed at one end 23a of the feed screw 23.

By rotating the drive motor, the third feed screw 2
3 to move the third nut 33 screwed onto the third feed screw in the axial direction of the third feed screw 23. Further, a pair of guide rods 30 are fitted to the third napht 33 and are slidable in parallel with the third feed screw 23 . Furthermore, a third nut 33 is provided to hold the component in the X direction and the Y direction.
A head mounting plate 34 is mounted to fix a clamping device (not shown) for moving in the vertical and horizontal directions and transporting the component to a predetermined position.

Function The present invention is constructed as described above, and its function will be explained below. 1 and 2, when the drive motor 16 rotates in the direction of arrow A, the first feed screw 2
1 rotates in the direction of arrow A.

Further, the rotation of the first feed screw is transmitted to the second feed screw 22 via the winding transmission member 25 and rotates in the direction of arrow A, and the first nut 31 and the second nut 32 cooperate with each other. , and is driven in the direction of arrow The nut 33 can be smoothly moved in the direction of arrow X1 at high speed.

Next, when the drive motor 18 rotates in the direction of arrow B, the third
The feed screw 23 also rotates in the direction of arrow B, and the third nut 3
3 in the direction of the force by arrow Y.

As a result, the rotation of the drive motors 16 and 18 creates a clamping device (not shown) for the parts mounted on the head mounting plate 34.
The parts are transported to a predetermined position by moving along an arbitrary route in the X direction and the Y direction (vertical and horizontal directions).

To return the head mounting plate 34 to its initial position, rotate the drive motor 16 in the direction of arrow C.
Since the nut 31 and the second nut 32 are driven in the direction of the arrow X2, the third nut 33 screwed onto the third feed screw 23 whose both ends are supported by the bearing stand 29 is moved in the direction of the arrow X2. can be done. Further, by rotating the drive motor 18 in the direction indicated by the arrow, the third feed screw 23 also rotates in the direction indicated by the arrow, and the third nut 33 is rotated in the direction indicated by the arrow Y.
It is possible to return to the initial position by moving in two directions.

Clamping device W for parts attached to the head mounting plate (not shown)
is the first nut 3 sliding on the high rigidity frame 19
It is supported by a third nut 33 screwed onto a third feed screw 23 whose both ends are supported by a bearing stand 29 fixed to the first and second nuts 32, and furthermore, the third nut has a pair of Since it is supported by the guide rod 30, it is difficult to bend due to the weight of the clamping device (not shown), and the positioning accuracy is extremely high. For example, in the embodiment shown in the figure, the repeatable positioning accuracy is ± It is 0.02 mm. Furthermore, even if parts are transported at a high speed of, for example, 11 n/sec, which is difficult with conventional devices (excluding the one shown in FIG. 3), the positioning accuracy will not deteriorate.

In the above embodiment, the power transmission device 14 has been described as a belt-driven device equipped with a wrapped transmission member 25 such as a timing belt, but in this power transmission device, a bevel gear is connected to the first feed screw 21. Various modifications can be considered, such as a gear drive mechanism in which the bevel gears are attached to the second feed screw 22 and connected by a shaft, and the present invention is not limited to the illustrated embodiment. Further, in the illustrated embodiment, a pair of guide rods 24 are provided on both sides of the first feed screw 21 and the second feed screw 22, and a third
A pair of guide rods 30 are provided on both sides of the feed screw 23 to maintain the accuracy of movement by each feed screw, but this is not limited to this mechanism, and it is possible to use guide rods. It is clear that a known reciprocating sliding device such as a linear guide may be used instead.

Effects As described above, the present invention provides a U-shaped high rigidity structure using the first and second feed screws arranged parallel to each other and a power transmission device that drives the two feed screws in synchronization. A third feed screw is connected to the frame, and the third feed screw is rotatably supported at both ends by nuts screwed in opposite directions to the first and second feed screws, respectively. At the same time, the opening formed in one side of the U-shaped high-rigidity frame can be fixed to the nut screwed onto the third feed screw. This has the effect that the movable range of the component clamping device can be greatly expanded toward the part, and the transportation path for the components can be easily ensured to increase the transportation stroke of the components. In addition, within the movable range of the clamping device driven by three feed screws arranged on a U-shaped high-rigidity frame, variations in positioning accuracy due to position are eliminated, and the precision is always constant at any position. This has the effect of enabling accurate positioning, and as a result, the number of feed screws can be reduced by one compared to the conventional component conveyance device, and the mechanism can be simplified, so This has the effect of being able to provide a much cheaper parts conveying device while still having the same performance.

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the present invention, FIG. 1 is a perspective view showing the entire parts conveying device, FIG. 2 is a partially broken and partially cross-sectional plan view, and FIG. 3 is a conventional example. FIG. 2 is a partially cutaway plan view showing the component conveyance device according to the present invention. 11 is a first feed screw device, 12 is a second feed screw device, 13 is a third feed screw device, 14 is a power transmission device, 1
5 is a parts conveyance device, 16° 18 is a drive motor, 21 is a first feed screw, 21a is one end, 22 is a second feed screw,
23 is a third feed screw, 23a is one end, 23b is another end, 31 is a first nut, 32 is a second nut, and 33 is a third nut.

Claims (1)

[Claims] a first feed screw device including a first feed screw formed of a predetermined lead and a first nut screwed onto the first feed screw; and a first feed screw device arranged in parallel with the first feed screw device. a second feed screw that is provided and formed of the same lead; and a second nut that is screwed onto the second feed screw and is disposed opposite to the first nut. a second device;
a power transmission device that drives the feed screw device in synchronization with the first feed screw device; and a third feed screw device that is orthogonal to the first feed screw and the second feed screw and is formed of a predetermined lead.
and a third nut screwed onto the third feed screw, both ends of the third feed screw being rotatably supported by the first nut and the second nut. Third
1. A parts conveyance device comprising: a feed screw device; and a drive motor connected to one end of the first feed screw and one end of the third feed screw, respectively.