KR100515967B1 - Component Mounting Device - Google Patents

Abstract

According to the invention, the first axis and the second axis disposed at right angles to the first axis; A guide rail fixed on the first axis; An upper frame linearly reciprocating along the first axis and having the second axis fixed to one side; A first sliding bearing fixed to a bottom surface of the upper frame and installed to slide along the guide rail; A lower frame having an insertion portion into which the upper frame can be inserted and linearly reciprocated along the first axis; A second sliding bearing fixed to a bottom of the lower frame and installed to slide along the guide rail; And one or more springs interconnecting the upper frame and the lower frame.

Description

Shaft coupling mechanism and component mounting device having the same

The present invention relates to a shaft coupling mechanism and a component mounting apparatus using the same, and more particularly, to a shaft coupling mechanism capable of tilt correction of the shaft and a component mounting apparatus using the same.

Typically in automated equipment, the axes are arranged at right angles to one another in order for a particular actuator to make X-Y plane motion, and one of the axes is linearly reciprocated relative to the other. A shaft linkage mechanism is used to interconnect these shafts. Component mounting apparatus is exemplified as representative equipment in which the first axis and the second axis are interconnected by an axis connecting mechanism to perform X-Y plane motion relative to each other.

The component mounting apparatus includes a head assembly for adsorbing an electronic component with an adsorption nozzle to mount the electronic component at a predetermined position on a substrate, and has a plane transfer mechanism for planar movement of the head assembly. In general, a component mounting apparatus includes a pair of parallel first axes, and a second axis disposed at right angles to the first axis and having both ends supported in a linear reciprocating motion on the first axis, and having an adsorption nozzle. The head assembly may reach a predetermined position on the printed circuit board by linearly reciprocating along the second axis. The second shaft may be conveyed by the drive motor and ball screw installed on the first shaft, and the head assembly may be conveyed by the drive motor and ball screw installed on the second shaft. Here, the drive motor and the ball screw for linearly reciprocating the second shaft may be installed in only one of the pair of parallel first axes or both.

1 shows a schematic perspective view of a conventional component mounting apparatus, which corresponds to a case where a motor and a ball screw for linearly reciprocating a second axis are installed in only one place.

Referring to the drawings, the component mounting apparatus includes a pair of first shafts 11 and 11 'and a second shaft 12 disposed at right angles to the first axis and capable of linear reciprocating along the first axis. Equipped. Both ends of the second shaft 12 are connected to the first shafts 11 and 11 ', respectively, via connecting frames 19 and 19'. A sliding bearing 17 is fixed to the lower end of the connecting frame 19, and a bush 19a to which the ball screw 15 is coupled is fixed to one side. The sliding bearing 17 may be transported along the guide rail 16 fixed to the upper portion of the first shaft 11. A drive motor 14 is provided at the end of the first shaft 11, and the rotational force of the drive motor 14 rotates the ball screw 15 through the shift coupling 14a. When the ball screw 15 is rotated by the drive motor 14, the second shaft 12 can be reciprocated by the action of a bush (not shown) installed in the connecting frame 19. At this time, the slide bearing 17 is transported along the guide rail 16. On the other hand, a slide bearing 17 'is installed on the bottom of the connecting frame 19' provided at the other end of the second shaft 12, and the slide bearing 17 'is a guide rail fixed to the first shaft 11'. Transfer along 16 '. Unlike the connecting frame 19, the ball screw is not coupled to the connecting frame 19 'at the other end, so that only a sliding action occurs at the connecting frame 19' at the other end.

As above, when the drive motor 14 and the ball screw 15 for driving the second shaft 12 are installed in only one of the first shafts 11, the second shaft 12 supports only one end. The phenomenon is similar to that of the supported support. That is, since the second shaft 12 is supported so as to receive the transfer driving force only in the connecting frame 19 and to slide only in the connecting frame 19 'at the other end, the second shaft 12 is in the reciprocating transfer. Bend phenomenon occurs and vibration may occur. This bending phenomenon is more complicated because the center of gravity changes in accordance with the position of the head assembly 13 linearly reciprocating along the second axis (12). As such, when the second shaft 12 is bent, the adsorption nozzle installed in the head assembly 13 may not accurately reach the position at which the component is adsorbed or mounted.

In order to prevent such a phenomenon, there is an example in which a ball screw and a driving motor are installed at the other end of the second shaft 12 shown in FIG. 1, that is, the connection frame 19 '. In this case, however, it takes time to reach the final value even if the pair of motors are driven simultaneously by transmitting a drive signal to a pair of elaborately manufactured motors. Negative phenomena such as bending, deflection, and vibration will occur.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a shaft connecting mechanism that can be prevented from bending or vibration of the second shaft that is linearly reciprocated with respect to the first axis.

Another object of the present invention is to provide a shaft connecting mechanism in which the bending phenomenon of the second shaft and the like can be prevented by improving the connecting structure between the first shaft and the second shaft.

Another object of the present invention is to provide a component mounting apparatus having an improved shaft coupling mechanism.

In order to achieve the above object, according to the present invention, a first axis and a second axis disposed at a right angle with respect to the first axis; A guide rail fixed on the first axis; An upper frame linearly reciprocating along the first axis and having the second axis fixed to one side; A first sliding bearing fixed to a bottom surface of the upper frame and installed to slide along the guide rail; A lower frame having an insertion portion into which the upper frame can be inserted and linearly reciprocated along the first axis; A second sliding bearing fixed to a bottom of the lower frame and installed to slide along the guide rail; And one or more springs interconnecting the upper frame and the lower frame.

According to one feature of the present invention, one side of the lower frame is provided with a bushing mounting portion, the bushing mounted on the bushing mounting portion, and further comprises a ball screw coupled to the bushing.

According to the present invention, there is also provided a pair of first shafts arranged in parallel and a second shaft which is installed so that both ends can be linearly reciprocated with respect to the first axis; Guide rails respectively fixed on the pair of first axes; An upper frame linearly reciprocated along the pair of first axes and fixed to both ends of the second axis; A first sliding bearing fixed to a bottom surface of the upper frame and installed to slide along the guide rail; A lower frame having respective inserts into which the upper frame can be inserted and linearly reciprocated along the first axis; A second sliding bearing fixed to a bottom of the lower frame and installed to slide along the guide rail; One or more springs interconnecting the upper frame and the lower frame; Bushes mounted on the bushing mounting portion formed on one side of the lower frame, respectively; Ball screws respectively coupled to the bushings; And a drive motor for rotating the ball screw to rotate the ball screw so as to drive the ball screw in synchronization.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. The shaft connecting mechanism according to the present invention will be described as an example applied to the component mounting apparatus. However, one of ordinary skill in the art will appreciate that such shaft coupling mechanisms can be used in a variety of equipment other than component mounting devices.

The component mounting apparatus with the shaft connection mechanism according to the present invention is similar to the conventional component mounting apparatus shown in FIG. That is, a second pair of parallel first axes 11, 11 'and at a right angle with respect to the first axis and supported at both ends on the first axes 11, 11' and linearly reciprocating along it. An axis 12 and a head assembly 13 which linearly reciprocates along the second axis 12 and has a component adsorption nozzle. The present invention improves the connection structure between the first axis (11, 11 ') and the second axis (12), which is applied only to one end of the second axis (12) or both ends of the second axis (12) Applicable to Also, as shown in FIG. 1, only one driving motor and a ball screw for driving the second shaft 12 may be applied, or a driving motor and a ball screw for driving the second shaft 12 may be applied. The same may be applied to the case in which the pair of the second shaft 12 is employed in pairs.

2 is a schematic perspective view showing a shaft connecting mechanism according to the present invention as a structure for connecting a first shaft and a second shaft in a component mounting apparatus.

Referring to the drawings, the first shaft 11 and the second shaft 12 are interconnected by a shaft connecting mechanism 20. The shaft coupling mechanism 20 is fixed to one end or both ends of the second shaft 12 and is provided with an upper frame 21 installed to be slidable with respect to the first shaft, and sliding with respect to the first shaft 11. It is provided so that the lower frame 22 is linearly reciprocating and a plurality of springs 23 for interconnecting the upper frame 21 and the lower frame 22 is provided. The spring 23 has the form of a bar, in which eight springs interconnect the upper and lower frames 21, 22. Although not shown in FIG. 2, the first sliding bearing is fixed to the lower part of the upper frame 21, and the first sliding bearing slides along the guide rail 27 fixed to the upper part of the first shaft 11. Can be. In addition, the second sliding bearing 32 is fixed to the lower part of the lower frame 22, which may also slide along the guide rail 27.

One side of the lower frame 22 is provided with a bushing mounting portion 24, the bushing 25 is mounted to the bushing mounting portion 24. Ball screw 26 is coupled to the bush 25, so when the ball screw 26 is rotated by the rotational driving force of the motor (not shown), the lower frame 22 also moves along the guide rail 27, The upper frame 21 connected to the lower frame 22 and the second shaft 12 fixed thereto through the spring 23 also move along the guide rail 27.

3 is a schematic exploded perspective view showing an upper frame, a first sliding bearing, and the like.

Referring to the drawings, the upper frame 21 has an overall T shape with an upper horizontal extension 35. The horizontal extension part 35 is formed with a spring insertion groove 33 to which the spring 23 can be fixed. The upper end of the spring 23 is fixed relative to the upper frame 21, while the lower end of the spring 23 is fixed relative to the lower frame 22 as described later. In addition, the vertically extending portion of the upper frame 21 is formed with a drive motor insertion hole 37 for driving the head assembly 13 (Fig. 1). One side of the horizontal extension 35 forms a connection surface 36 for connection to the second axis 12.

The first sliding bearing 31 is fixed to the bottom of the upper frame 21. The first sliding bearing 31 is provided separately from the second sliding bearing 32 fixed to the lower frame 22. As the guide rail 27 is inserted into the rail inserting portion 38 formed in the first sliding bearing 31, the upper frame 21 may be linearly reciprocated along the guide rail 27. The first sliding bearing 31 is provided with a ball bearing, which is in contact with the guide rail 27 to make a rolling motion. At this time, the ball bearing provided in the first sliding bearing 31 is allowed a predetermined flow in the contact surface with the guide rail 27. Therefore, the first sliding bearing 31 may be biased by a predetermined angle with respect to the linear direction of the guide rail 27.

4 is a schematic perspective view of the lower frame, the second sliding bearing, and the like.

Referring to the drawings, the lower frame 22 includes both side portions 22a on which the second sliding bearing 32 is fixed to the bottom, an upper frame insert 46 formed therebetween, and a bush mounting portion 24. do. The second sliding bearing 32 is fixed to the portion 22a and can slide along the guide rail 27 disposed below it. The vertical extension of the upper frame 21 shown in FIG. 3 is inserted into the upper frame insert 46 formed in the lower frame 22.

The lower frame 22 has a spring insertion groove 41 and a spring insertion hole 42 for fixing the spring 23 is formed. Lower ends of the plurality of springs 23 are fixed to the insertion grooves 41 and the insertion holes 42, respectively, so that the upper frame 21 and the lower frame 22 can be elastically connected. The bush 25 is mounted to the bush mount 24, and a ball screw 26 is coupled to the bush 25.

Hereinafter, the operation of the component mounting apparatus having a connection frame according to the present invention will be briefly described. In particular, a case in which the connecting frame according to the present invention is installed at both ends of the second shaft, and the ball screw and the driving motors are also installed at both ends of the second shaft will be described.

When a signal is applied to a pair of drive motors for driving the second shaft 12, the ball screws 26 respectively installed with respect to both ends of the second shaft 12 are rotated, so that the lower frame 22 The second sliding bearing 32 is transported along the first shafts 11 and 11 ′. At the same time, a transfer force is also transmitted to the upper frame 21 connected via the lower frame 22 and the spring 23, and thus the first of the upper frame 22 fixed to both ends of the second shaft 12. The sliding bearing 31 is also conveyed along the first shafts 11 and 11 '. The second shaft 12 is also conveyed by the conveyance of the upper frame 22.

In the above conveying operation, the driving force transmitted from each motor is different depending on the characteristics of the motor, and when a different driving force is transmitted to each lower frame 22 installed about both ends of the second shaft 12, The second shaft 12 may instantaneously warp and vibrate. However, such momentary bending and vibration phenomenon can be absorbed by the spring 23. In addition, since the first sliding bearing 31 fixed to the lower part of the upper frame 21 may be biased at a predetermined angle with respect to the guide rail 27 in view of its characteristics, the sliding bearing 31 even if bending and vibration are momentarily applied. ) Is biased and the second shaft 12 itself is not twisted. Accordingly, the second shaft 12 can be slid smoothly along the first shaft 11 without any bending or vibration load being applied to the second shaft 12 or the guide rail 27.

The shaft coupling mechanism according to the present invention has the advantage that the second shaft is not bent or vibrated during linear transfer of the second shaft with respect to the first shaft. Therefore, there is an advantage that accurate second axis feed is possible. In particular, when the feed driving force is provided at both ends of the second axis, there is an advantage that it is possible to correct an error that may occur when such a feed driving force is not synchronized. When the shaft coupling mechanism according to the present invention is applied to a component mounting apparatus, the head assembly has an advantage that the component can be sucked or mounted at the correct position.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely an example, and those skilled in the art that various modifications and equivalent other embodiments are possible. I can understand. Therefore, the true scope of the invention should be defined only by the appended claims.

1 is a schematic perspective view of a conventional component mounting apparatus.

2 is a schematic perspective view of a part of a component mounting apparatus having a shaft connection mechanism according to the present invention.

3 is a schematic exploded perspective view of the upper frame and the first sliding bearing, etc. in FIG.

Figure 4 is a schematic exploded perspective view of the lower frame and the second sliding bearing, etc. in Figure 2;

<Brief Description of Major Codes in Drawings>

11. 1st axis 12. 2nd axis

13. Head Assembly 14. Drive Motor

15. Ball screw 16. Guide rail

17. Slide bearing 18. Ball screw

19. Connecting frame 21. Upper frame

22. Lower frame 23. Spring

24. Bush Mount 25. Bush

26. Ball screw 27. Guide rail

Claims (2)

A pair of first shafts arranged in parallel and a second shaft installed at both ends so as to be linearly reciprocated with respect to the first shaft; Guide rails respectively fixed on the pair of first axes; An upper frame linearly reciprocated along the pair of first axes and fixed to both ends of the second axis; A first sliding bearing fixed to a bottom surface of the upper frame and installed to slide along the guide rail; A lower frame having respective inserts into which the upper frame can be inserted and linearly reciprocated along the first axis; A second sliding bearing fixed to a bottom of the lower frame and installed to slide along the guide rail; And, And at least one spring connecting the upper frame and the lower frame to each other. . The method of claim 1, One side of the lower frame is a bush mounting portion, A bush mounted to the bush mounting unit; A ball screw coupled to the bush; And, And a drive motor for rotating the ball screw to rotate the ball screw in synchronization with each other.