KR20090097391A - Head assembly for chip mounter - Google Patents

Abstract

A head assembly for a part-mounter is provided, which can improve parts-mounting speed of a part-mounter and reduces load generated while moving parts. A head assembly for a part-mounter comprises a head(210), a plurality of nozzle spindles(230), a cap, and a rotary unit. The head is rotatively installed in the horizontal shifter of a part-mounter. The nozzle spindle is radially arranged in the head. The cam is rotatively installed at the head. The cam successively transfers nozzle spindles in a straight line. The rotary unit individually rotates the head and the cams. The head is formed in a hollow cylinder shape.

Description

Head assembly for chip mounter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head assembly for a component mounter, and more particularly, to a head assembly for a component mounter that picks up components to be supplied and mounts the picked up components on a substrate.

The component mounter refers to a device for mounting an electronic component (hereinafter, referred to as a component) such as an integrated circuit, a high density integrated circuit, a diode, a capacitor, and a resistor on a substrate such as a printed circuit board.

Such a component mounter picks up a component supply device for supplying parts to be mounted on a board, a substrate transport device for transporting a board so that components supplied by the component supply device can be mounted, and then picks up parts supplied from the component supply device. A head assembly with a nozzle spindle to mount the mounted parts on a substrate, and the head assembly is picked up at a preset position to supply the parts, that is, the picked up parts And a horizontal moving device for horizontally moving the head assembly to be mounted at a predetermined position to be mounted, that is, in the component mounting area.

Therefore, when the component supply device supplies the component to the component pick-up area, the horizontal moving device moves the head assembly to the top of the component pick-up area.

Next, when the head assembly is moved to the upper portion of the component pick-up area, the head assembly moves the provided nozzle spindle downward along the Z-axis direction to pick up the parts supplied to the component pick-up area. After being picked up, the nozzle spindle is returned to its original position, the upward direction.

Then, when the component is picked up and the nozzle spindle is returned to its original position, the horizontal shifting device is a position where the substrate transporter transports the substrate so that the component is mounted on the head assembly that picked up the component. Will be moved to.

Thus, the head assembly picks up the parts and moves the nozzle spindle returned to its original position back to its downward direction to mount the picked up parts onto the substrate transported to the parts mounting area.

On the other hand, in recent years, in order to cope with the trend of high integration and high functionalization of electronic devices, high component mounting efficiency has been developed.

In particular, the head assembly of the component mounter, which is recently developed, is provided with a plurality of nozzle spindles side by side in order to increase the component mounting efficiency, and each of these nozzle spindles is moved up and down individually on the upper part of the plurality of nozzle spindles. A number of drive motors are provided for the purpose.

Thus, each nozzle spindle is moved up and down individually by the drive motor to pick up parts in turn or simultaneously in the part pick-up area, and then mount these picked up parts in the part mounting area in turn or simultaneously on the substrate, thereby It will increase the mounting efficiency.

However, since the head assembly of the conventional component mounter is provided with a plurality of drive motors for driving a plurality of nozzle spindles, for example, six drive motors for driving six nozzle spindles, the head assembly is provided. The overall weight of is greatly increased.

As a result, there is a problem that the component mounting speed of the component mounter, which is closely related to the component mounting efficiency, is greatly reduced due to the weight increase of the head assembly, and the load is greatly increased to move the head assembly. The problem that the error rate of becomes high arises.

Accordingly, the present invention has been made in view of the above problems, and the problem to be solved by the present invention is to provide a head assembly for a component mounter that can increase the component mounting speed of the component mounter by reducing its weight. have.

In addition, another object of the present invention is to provide a head assembly for a component mounter that can reduce the load that can be generated during movement by reducing the weight thereof.

The present invention for solving the above problems is a head rotatably installed in a horizontal moving device of the component mounter, a plurality of nozzle spindles disposed radially on the head and installed in a linear reciprocating motion according to the arranged form, respectively And a cam rotatably installed on the head and rotated in contact with the plurality of nozzle spindles to linearly move the plurality of nozzle spindles sequentially, and a rotation unit for individually rotating the cam and the head. Provided is a head assembly for a mounter.

In another embodiment, the head may be formed in a hollow cylindrical shape, and may be disposed perpendicularly to the component mounting region in which the component is mounted.

In another embodiment, the plurality of nozzle spindles may each be disposed radially to the head through the circumferential surface of the head, and the cam may be arranged in the radial shape of the entire surfaces of the nozzle spindles. It may be disposed in the interior of the head so as to be in contact with the inner end disposed in the interior of the head, respectively.

In another embodiment, a plurality of spindle guides may be installed on the circumferential surface of the head to be spaced at even intervals so that the plurality of nozzle spindles, respectively, wherein the plurality of spindle guides each rotated nozzle spindle is fitted Only linear reciprocating movement is possible. In this case, each of the spindle guides may be installed to rotate on the circumferential surface of the head, and a guide gear for rotation of the spindle guide may be formed on the outer circumferential surface of the spindle guide.

In another embodiment, the head assembly for the component mounter may further include a spindle rotating unit engaged with the guide gear to rotate the spindle guide and the nozzle spindle fitted to the spindle guide.

In another embodiment, a ball roller may be installed at the inner end of the nozzle spindle to contact the cam.

In another embodiment, the head assembly for a component mounter may further include a spindle return spring coupled to the nozzle spindle to return each of the plurality of nozzle spindles moved by the cam back to their original position. In this case, the spindle return spring is embodied as a coil spring disposed between the inner end of the nozzle spindle and the circumferential surface of the head and returning the nozzle spindle to its original position by spring tension, or the inner end of the nozzle spindle. And a coil spring disposed between the outer end located opposite to and the circumferential surface of the head and returning the nozzle spins to their original position by a spring compression force.

In another embodiment, the rotation unit may include a cam rotation unit connected to the cam to rotate the cam, and a head rotation unit connected to the head to rotate the head. In this case, the head may be connected to the side of the head shaft rotatably connected to the horizontal moving device, a shaft gear for rotation of the head shaft may be formed on a portion of the outer peripheral surface of the head shaft, the head rotating unit is The head connected to the shaft gear and the head connected to the head shaft can be rotated by engaging the shaft gear. In addition, the head shaft may be formed in a hollow, the cam shaft connected to the cam to rotate the cam may extend into the head shaft, the cam rotation unit is coupled to the cam shaft in the head shaft The cam shaft can be rotated.

According to the head assembly for a component mounter of the present invention, since a plurality of nozzle spindles can be linearly moved through a single cam, even if a plurality of nozzle spindles are provided in the head assembly, the weight of the head assembly is significantly larger than in the prior art. Lightweight. As a result, when the head assembly for the component mounter of the present invention is used, the weight of the head assembly can be increased, and the component mounting speed of the component mounter can be increased, and the load that can be generated during the movement can be significantly reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed subject matter is thorough and complete, and that the scope of the invention to those skilled in the art will fully convey. Like numbers refer to like elements throughout.

1 is a perspective view showing an embodiment of a head assembly for a component mounter according to the present invention, Figure 2 is a perspective view of the lead disassembled from the head assembly shown in Figure 1, Figure 3 is a head assembly shown in Figure 2 Disassembled perspective view of the spindle rotation unit and cover plate. 4 is the front view which looked at the head assembly shown in FIG. 1 from A direction, and FIG. 5 is the top view which looked at the head assembly shown in FIG. 1 from B direction.

1 to 5, the head assembly 200 for a component mounter according to an embodiment of the present invention is an apparatus for picking up components supplied from a component supply apparatus and then mounting the components on a substrate. Head (210) rotatably installed on the horizontal moving device of the mounting machine, a plurality of nozzle spindles 230, radially arranged in the head 210 and installed in a linear reciprocating movement according to the arrangement form spindle, a cam 250 that is rotatably installed on the head 210 and rotates to contact the plurality of nozzle spindles 230 to linearly move the plurality of nozzle spindles 230, the cams. A rotation unit for rotating the 250 and the head 210 separately, a spindle rotation unit for rotating the nozzle spindle 230, and the spindle rotation unit And a re-de (273, lid) that covers from.

Specifically, the head 210 is formed in a hollow cylindrical shape having one surface opened, and is rotatably connected to the horizontal moving device of the component mounter via the head shaft 211, and the component 32 is mounted thereon. It is disposed perpendicular to the component mounting area. In other words, one end of the head shaft 211 is rotatably connected to the horizontal moving device through a bearing or the like, and the other end of the head shaft 211 is the other surface opposite to one surface of the head 210. In short, it is connected to the central portion of the unopened side.

The head shaft 211 connected to the head 210 is formed in a hollow shape, and a part of the outer circumferential surface thereof, for example, a part of the outer circumferential surface of the head shaft 211 adjacent to the head 210, is formed on the head shaft 211. A shaft gear 219 for rotation is formed. Therefore, the cam rotating unit to be described later is installed inside the head shaft 211 formed in the hollow, the head rotating unit to be described later is to engage the shaft gear 219 to rotate the head shaft 211.

The plurality of nozzle spindles 230 are disposed radially to the head 210 to penetrate the circumferential surface of the head 210, one end, the inner end is disposed inside the head 210 The other end, that is, the outer end opposite to the inner end is disposed outside of the head 210. In this case, the plurality of nozzle spindles 230 may be arranged to be spaced apart at equal intervals.

In addition, a ball roller 232 may be installed at the inner end of the nozzle spindle 230 to be in contact with the cam 250, and at the outer end of the nozzle spindle 230, the suction may be directly in contact with the component 32. The nozzle 231 may be fitted. Thus, when the nozzle spindle 230 is linearly reciprocated along a radial shape, the adsorption nozzle 231 fitted to the outer end of the nozzle spindle 230 is in direct contact with the component 32 to bring the component 32 into contact. You can pick up.

On the other hand, the adsorption of the component 32 may be a suction force using a vacuum. Therefore, a vacuum line (not shown) for providing a vacuum to the inside of the nozzle spindle 230 may be connected to the inner end side of the nozzle spindle 230. Therefore, the vacuum supplied into the nozzle spindle 230 through the vacuum line may be supplied to the component 32 through the nozzle spindle 230 and the suction nozzle 231 fitted to the nozzle spindle 230. The component 32 may be adsorbed to the adsorption nozzle 231 by a vacuum transmitted through the adsorption nozzle 231. Here, the vacuum line may be connected to an external vacuum pressure generator (not shown) through a hollow head shaft 211 connected to the head 210. Therefore, the vacuum line is not twisted even when the head 210 is rotated.

In addition, a plurality of spindle guides 217 are disposed in a radial form on the circumferential surface of the head 210 so that the plurality of nozzle spindles 230 are fitted, respectively, and may be spaced apart from each other at uniform intervals. Thus, the plurality of nozzle spindles 230 may be fitted to the spindle guide 217, respectively. In this case, the plurality of spindle guides 217 may enable only the linear reciprocating movement without rotating the nozzle spindle 230 fitted therein. For example, the plurality of spindle guides 217 may be embodied as a ball spline such that the fitted nozzle spindle 230 is not rotated but only linearly moved. Reference numeral 216 is a guide hole formed in the circumferential surface of the head 210 so that the spindle guide 217 is installed.

In addition, although not shown in the drawings, the plurality of spindle guides 217 may be rotated on the circumferential surface of the head 210 while being installed so as not to be separated from the circumferential surface of the head 210 using bearings or the like, respectively. Can be installed. In addition, a guide gear 218 for rotating the spindle guide 217 may be formed at one side of the outer circumferential surface of the spindle guide 217.

The cam 250 may be in contact with an inner end portion disposed inside the head 210 or a ball roller 232 disposed at the inner end portion of the entire surfaces of the nozzle spindle 230 disposed in the radial shape. It may be disposed inside the head 210. In one embodiment, the cam 250 may be coupled to the cam shaft 251 installed into the head shaft 211 along the longitudinal direction of the head shaft 211, and may be rotated. The plurality of nozzle spindles 230 are linearly moved by pushing the ball roller 232 provided at the inner end of the nozzle spindle 230 or the inner end thereof by a predetermined distance. In this case, the shape of the cam 250 may be formed in a circular shape, an elliptic shape or a similar shape, and may be eccentrically coupled to the cam shaft 251.

A rotating unit for rotating the cam 250 and the head 210 separately is connected to the cam 250 to rotate the cam 250 and the head 210 is connected to the head 210 It may be configured as a head rotating unit for rotating the head 210.

At this time, the head rotating unit may rotate the head 210 connected to the head shaft 211 and the head shaft 211 by engaging the shaft gear 219 formed on the head shaft 211, the head The rotary motor 212, the shaft 213 connected to the head rotating motor 212, and the drive gear 214 coupled to the shaft 213 may be implemented. Here, the head rotation motor 212 may be fixed to any one side of the above-described horizontal moving device or the above-described component mounting machine.

The cam rotation unit may be installed in the head shaft 211 and may be implemented as a cam rotation motor 252 coupled to the cam shaft 251 to rotate the cam shaft 251. In this case, the cam rotation motor 252 and the head rotation motor 212 may be operated separately. Thus, the cam 250 and the head 210 may also be rotated separately from each other by separate operations of the motors.

On the other hand, the spindle rotating unit may be engaged with the guide gear 218 formed on the spindle guide 217 to rotate the spindle spindle 217 and the nozzle spindle 230 fitted to the spindle guide 217, the spindle The rotary motor 270, the shaft 272 connected to the spindle rotary motor 270, and the spindle rotary gear 271 connected to the shaft 272 may be implemented. The spindle rotation motor 270 may be installed on an upper surface of the cover plate 215 installed to cover the opened surface of the head 210, and the spindle rotation gear 271 may be the cover plate 215. It may be installed to engage with the guide gear 218 through.

Therefore, the spindle rotation motor 270 is fitted to the spindle guide 217 and the spindle guide 217 via the guide gear 218 engaged with the spindle rotation gear 270 and the spindle rotation gear 270. The nozzle spindle 230 may be rotated. Thus, when the adsorption angle θ of the component adsorbed on the adsorption nozzle 231 of the nozzle spindle 230 is distorted, the spindle rotation unit can adjust the adsorption angle through the above action.

Hereinafter, the operation relationship of the nozzle spindle 230 according to the present invention will be described with reference to FIGS. 6A to 6D together with FIGS. 1 to 5.

6A to 6D are diagrams for describing an operation relationship of the nozzle spindle 230 illustrated in FIG. 3.

1 to 6D, the cam rotation motor 252 rotates the cam 250 through the cam shaft 251 connected thereto. As a result, the plurality of nozzle spindles 230 in contact with the cam 250 are moved to the outside in a linear direction by a predetermined distance to the outside by the contact of the cam 250, the suction nozzle fitted to the nozzle spindle 230 231 is in contact with the component 32 in the moved state to absorb the component (32).

6A to 6D illustrate a state in which the head 210 is not rotated in order to explain the relationship between the cam 250 and the nozzle spindle 230, but the head 210 is actually the head rotating motor 212. Is rotated by driving. Therefore, when the head rotating motor 212 rotates the head 210 while the cam 250 is rotated, the plurality of nozzle spindles 230 installed in the head 210 are all moved in a linear direction. The component 32 can be attracted.

Here, the reason why the nozzle spindle 230 is moved to the outside of the head 210 is because of the contact of the cam 250 and the pushing force. However, the reason why the nozzle spindle 230 moved to the outside of the head 210 is returned to its original position, that is, moved to the inside of the head 210 has not been described in the above detailed description. However, various embodiments may be applied to return the nozzle spindle 230 moved to the outside of the head 210 to its original position. For example, any one of the cam 250 and the ball roller (or the inner end of the nozzle spindle 230) in contact with the cam 250 may be implemented with a magnet having a very large magnetic force, the other It may be implemented as a metal material affected by the magnetic force of the magnet. Thus, the nozzle spindle 230 can be returned to its original position by the magnetic force. And, another specific embodiment in which the nozzle spindle 230 returns to its original position will be described later.

FIG. 7 is a plan view illustrating a state in which the head assembly illustrated in FIG. 1 is mounted to a component mounter.

As shown in FIG. 7, the head assembly 200 for a component mounter according to the present invention may be installed in a horizontal moving device of the component mounter.

Specifically, the component mounter is a bed 110, a component supply device 170 is mounted to the bed 110 to supply the components (31, 32) to be mounted on a substrate 30, such as a printed circuit board, A substrate transporting device 150 for transporting the substrate 30 so that the components 31 and 32 are mounted, and installed in the upper portion of the bed 110 and horizontally with respect to the bed 110, that is, in the X direction It includes a horizontal moving device that is moved in the Y direction, the head assembly 200 for the component mounter according to the present invention is installed in such a horizontal moving device.

More specifically, the horizontal moving device is mounted on both sides of the bed 110 for the Y-axis transfer of the head assembly 200, Y-axis feed is mounted side by side in the Y-axis direction of the bed 110 Mechanism 120, X-axis transport mechanism 130 is mounted to the Y-axis transport mechanism 120 for the X-axis transport of the head assembly 200 mounted side by side in the X-axis direction of the bed 110, A first driver 182 for moving the X-axis feed mechanism 130 along the Y-axis, and a second driver 184 for moving the head assembly 200 along the X-axis feed mechanism 130. And, the head assembly 200 for the component mounter according to the present invention is installed on any one side of the X-axis feed mechanism (130).

Therefore, when the component supply device 170 supplies the component to the component pick-up area, the horizontal moving device moves the head assembly 200 according to the present invention by a predetermined distance in the X direction or the Y direction and the head assembly 200. ) Is moved to the top of the component pick-up area.

Then, when the head assembly 200 is moved to the upper part of the component pick-up area, the head assembly 200 rotates the head 210 and rotates the cam 250 so that a plurality of nozzle spindles 230 are provided. ) Is sequentially moved in the lower direction or the upper direction along the Z-axis direction (shown in FIGS. 1 to 5) to sequentially pick up the parts 32 supplied to the parts pickup area.

Subsequently, when the parts 32 supplied to the parts pick-up area are picked up, the horizontal transfer apparatus moves the head assembly 200 to which the parts 32 are picked up. ) Is moved to the component mounting area, which is the position where the substrate 30 is transported.

Accordingly, the head assembly 200 sequentially rotates the head 210 as well as the plurality of nozzle spindles 230 that pick up the parts 32 by rotating the cam 250 as in the pickup operation described above. The picked-up parts 32 are mounted on the substrate 30 transferred to the component mounting area by moving in the Z-axis direction.

At this time, in the conventional case, when the head assembly 200 is moved to the component mounting area, the pick-up time is considerable since the nozzle spindle 230 provided in the head assembly 200 is picked up by moving downward. In the case of the head assembly 200 according to the present invention, although the head 210 assembly 200 is moved to the component mounting area, the nozzle spindle 230 provided in the head assembly 200 moves downward. Since it is moved, the pick-up operation of the component and the mounting operation of the picked-up component can be performed much faster than the conventional method.

Meanwhile, the head assembly 200 for a component mounter according to the present invention may be implemented differently as described below in addition to the above-described embodiment.

8 is a front view showing another embodiment of the head assembly for component mounter according to the present invention.

As shown in FIG. 8, the component assembly head assembly 200a according to another embodiment of the present invention is coupled to the inner end side of the nozzle spindle 230 in addition to the various components of the above-described embodiment. It further includes a spindle return spring 235 for returning each of the plurality of nozzle spindles 230 moved by the cam 250 back to its original position.

Accordingly, the cam 250 and the ball roller 232 contacting the cam 250 are not limited to magnets or metal materials, but may be formed of various materials, and thus may be returned to their original positions. do.

Here, the spindle return spring 235 is disposed between the spring engaging jaw 234 provided at the inner end of the nozzle spindle 230 and the circumferential surface of the head 210, and the nozzle spindle 230 by a spring tension force ) May be implemented as a coil spring that returns the to the original position.

Therefore, the plurality of nozzle spindles 230 moved by the cam 250 to the outside of the head 210 can be returned to their original position by the tension of the spindle return spring 235 installed as described above. do.

9 is a front view showing another embodiment of the head assembly for component mounter according to the present invention.

As shown in FIG. 9, the component assembly head assembly 200b according to another embodiment of the present invention is coupled to the outer end side of the nozzle spins 230 in addition to the various components of the above-described embodiment. And a spindle return spring 236 for returning each of the plurality of nozzle spindles 230 moved by the cam 250 back to its original position.

Accordingly, the cam 250 and the ball roller 232 contacting the cam 250 are not limited to magnets or metal materials, but may be formed of various materials, and thus may be returned to their original positions. do.

Here, the spindle return spring 236 is disposed between the spring engaging projection 237 of the outer end and the circumferential surface of the head 210 opposite the inner end of the nozzle spindle 230 and by the spring compression force It may be implemented as a coil spring to return the nozzle spindle 230 to its original position.

Therefore, the plurality of nozzle spindles 230 moved to the outside of the head 210 by the cam 250 can be returned to their original position by the compression force of the spindle return spring 236 installed as described above. do.

As mentioned above, although the present invention has been described with reference to the illustrated embodiments, it is only an example, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the scope of the present invention should be defined by the appended claims and their equivalents.

1 is a perspective view showing an embodiment of a head assembly for a component mounter according to the present invention.

2 is an exploded perspective view of a lead in the head assembly shown in FIG. 1.

3 is an exploded perspective view of the spindle rotating unit and the cover plate in the head assembly shown in FIG. 2.

4 is a front view of the head assembly shown in FIG. 1 as viewed from the A direction.

FIG. 5 is a plan view of the head assembly shown in FIG. 1 viewed in the B direction. FIG.

6A to 6D are diagrams for describing an operation relationship of the nozzle spindle shown in FIG. 3.

FIG. 7 is a plan view illustrating a state in which the head assembly illustrated in FIG. 1 is mounted to a component mounter.

8 is a front view showing another embodiment of the head assembly for component mounter according to the present invention.

9 is a front view showing another embodiment of the head assembly for component mounter according to the present invention.

Claims (13)

A head rotatably installed in a horizontal moving device of the component mounter; A plurality of nozzle spindles disposed radially in the head and installed in a linear reciprocating manner along the arranged form; A cam rotatably installed on the head and rotating to contact the plurality of nozzle spindles to linearly move the plurality of nozzle spindles sequentially; And, And a rotation unit for rotating the cam and the head separately. The method of claim 1, The head is formed in a hollow cylindrical shape, the head assembly for the component mounter, characterized in that arranged vertically with respect to the component mounting area in which the component is mounted. The method of claim 2, The plurality of nozzle spindles are respectively disposed radially to the head through the circumferential surface of the head, And the cam is disposed inside the head such that the cam is in contact with an inner end portion disposed inside the head of the entire surfaces of the nozzle spindles arranged in the radial shape. The method of claim 3, wherein The circumferential surface of the head is provided with a plurality of spindle guides spaced apart at equal intervals so that the plurality of nozzle spindles are fitted respectively, The plurality of spindle guide is a head assembly for a component mounter, it characterized in that only the linear reciprocating movement is possible without the nozzle spindle is inserted respectively. The method of claim 4, wherein The spindle guides are respectively installed to be rotated on the circumferential surface of the head, A head assembly for a component mounter, characterized in that a guide gear for rotating the spindle guide is formed on the outer circumferential surface of the spindle guide. The method of claim 5, And a spindle rotating unit engaged with the guide gear to rotate the spindle guide and the nozzle spindle fitted to the spindle guide. The method of claim 3, wherein And a ball roller installed at an inner end of the nozzle spindle to be in contact with the cam. The method of claim 3, wherein And a spindle return spring coupled to the nozzle spindle for returning each of the plurality of nozzle spindles moved by the cam back to their original position. The method of claim 8, And the spindle return spring is a coil spring disposed between the inner end of the nozzle spindle and the circumferential surface of the head, the coil spring returning the nozzle spindle to its original position by a spring tension force. The method of claim 8, The spindle return spring is a coil spring disposed between an outer end positioned opposite the inner end of the nozzle spindle and a circumferential surface of the head, the coil spring returning the nozzle spindle to its original position by a spring compression force Head assembly for mounter. The method of claim 1, The rotating unit is a head assembly for a component mounter comprising a cam rotating unit connected to the cam to rotate the cam, and a head rotating unit connected to the head to rotate the head. The method of claim 11, The head is connected to the side of the head axis rotatably connected to the horizontal moving device, A shaft gear for rotating the head shaft is formed on a portion of the outer circumferential surface of the head shaft, And the head rotating unit rotates the head connected to the head shaft and the head shaft by engaging the shaft gear. The method of claim 12, The head shaft is hollow, A camshaft connected to the cam to rotate the cam extends into the head axle, And the cam rotation unit is coupled to the cam shaft inside the head shaft to rotate the cam shaft.

Images