KR100384374B1 - Lapping head with vibrating tool holder - Google Patents

Abstract

The present invention relates to a lapping head having a vibrating tool holder composed of a drive shaft 1 and a plurality of tool holders 6 connected to a drive motor 1 by means of first and second drive devices for transmitting motion, ); The first drive device 3 and 5 comprise a first body 5 for supporting a tool holder 6 made integral with the drive shaft 1 and the second drive device comprises a tool holder 6, 7) Vibrating around. The second drive device comprises a first gear 15 rotating in a plurality of tool holders 6 and a plurality of first gears 15 through two toothed elements 14 and 15 ' 1, and one of the two toothed elements is tilted along the traveling direction. The tool holder 6 rotates in the support so as to vibrate when the engagement of the toothed elements is made at the portion indicating the tilt change.

Description

Lapping head with vibrating tool holder

The present invention relates to a lapping machine used for machining a stone such as marble, granite and the like, or a lapping head including a vibrating tool holder for use in a polishing machine.

A head including a vibrating tool holder for lapping and polishing a stone is known to those skilled in the art. The head has a vertical shaft connected to the corresponding drive shaft on one side and to the case for rotation on the other side at a set speed. A stationary reaction flange supported by the case is disposed between the case, which receives the motion of the motor, and the case by means of a bearing having an axis parallel to the axis of the shaft. Since the case holds a plurality of tool holders and a cutting tool corresponding to the tool holder can be attached and the tool holder vibrates about each axis through a mechanical transmission connected to the drive motor, Will be oscillated around the axis and will be driven to simultaneously rotate around the axis of the drive motor. According to another operating technique, a machine having a cylindrical grinding wheel may be used. Examples of heads for this type of lapping machine are found in patents EP-571,340, IT-1,198,798 and IT-FI-96-V-00062.

The kinematic coupling for transferring motion from the main shaft to the various tool holders can be accomplished in a number of ways. For example, an appropriate form, eccentric cam, may be used; Practical solutions are known for using rockers, levers or connecting rods with rollers that interact with the associated cam device.

When the above-described type of component is used, the vibration of the tool holder is generated irregularly because the structure of the drive device is the same. When the constant rotational motion of the drive shaft is replaced by the reciprocating motion of the various driven shafts, the same drive arrangement can cause free time and acceleration. The occurrence of this phenomenon is disadvantageous in the lapping process. In addition, when using a large amount of diamond tools, it is particularly problematic to increase the cutting speed with the above-mentioned type of parts.

It is an object of the present invention to provide a lapping head in which a drive shaft moves and vibrates a tool holder by a motion transfer device, said lapping head comprising a plurality of gears rotating in a tool holder, And a crown gear driven by a shaft. Wherein the crown gear is connected to the gear through engagement of the pair of toothed elements and one of the toothed elements is tilted along the advancing direction; The toolholder rotates in the support so that the toothed element oscillates when engaged with each other at the portion indicating the change in slope.

The present invention allows the tool to vibrate uniformly without causing floating time and acceleration that characterize the prior art, enabling faster work speeds. That is, the lapping head according to the present invention ensures high-efficiency production and high quality of the finished product.

This result is achieved according to the invention by providing a lapping head comprising a vibrating tool holder having the features described in claim 1. [ Other features are described in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be clearly understood by reading the detailed description in conjunction with the accompanying drawings in accordance with the embodiments of the present invention. However, the present invention is not limited to the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an upper side view of a lapping head according to an embodiment of the present invention, cut to detail each part;

FIG. 2 is an upper side view showing a part of FIG. 1 precisely; FIG.

3 is a view showing a traveling direction of a tooth element of a crown gear according to the present invention.

* Code Description

1 ... drive shaft 2, 3 ... flange

4 ... screw 5 ... first body

6 ... tool holder 8 ... second gear

9 ... 3rd gear 10,11 ... in teeth element

12 ... crown gear 17 ... second support

18 ... my joint 20 ... spring

21 ... ball 24 ... expanding part

A lapping head comprising a vibrating tool holder structured in accordance with the invention consists of a drive shaft (1) held at the top of a flange (2) defining a part (2) coupled to the drive.

In fact, the flange 2 makes it possible to attach the wrapping head to the cone of the machine, which is not within the scope of the present invention and therefore not shown in the drawing. The lapping head is composed of a plurality of tool holders 6 connected to the drive shaft 1 by first and second drive devices, as described below.

The first drive unit includes a first body 5 for supporting the tool holder 6 and the first body is integrally formed with the flange 3 provided at the lower portion of the drive shaft 1 And fixed with a screw (4).

The second drive device causes the vibration of the tool holder 6 about the axis 7 which is at a constant angle with the drive shaft 1 when the drive shaft 1 rotates; In particular, the shaft 7 of the tool holder 6 is disposed radially at right angles to the drive shaft 1. [ But is not limited to the number of shafts shown in the drawings (six).

The second device for transferring the motion comprises a plurality of first gears 15 rotating in the tool holder 6 and a crown gear 12 connected to the drive shaft 1 and driven by the drive shaft 1 . The gear trains 8 and 9 can be disposed between the drive shaft 1 and the crown gear 12 as shown in the embodiments herein.

As shown in the figure, the second gear 8 for moving the third gear 9 rotating in the second support 17 located at the upper position relative to the first support 5 is mounted on the drive shaft 1 do.

The third gear 9 has two internal toothing elements 11 and 10 for engaging with the first toothed element 13 and the second toothed gear 8 supported by the crown gear 12, respectively.

In this way, it is possible to drive the downstream gear and the crown gear 12 by correcting the rotational motion derived from the drive shaft 1 in accordance with the set gear ratio.

The crown gear 12 is configured to engage with the first gear 15 through engagement with two toothed elements 14, 15 ', one of the toothed elements being tilted along the direction of travel; When the toothed element exhibits a tilt change, by rotating with respect to the support 5, the tool holder 6 is oscillated.

A tooth element indicating one or more tilt changes along the traveling direction may be provided to the crown gear 12 or the first gear 15.

In the embodiment described above, a specific tooth 14 is formed in the crown gear 12.

As shown in Fig. 3, the specific tooth 14 alternately has a straight portion and an inclined portion.

Particularly, considering the progression of 360 degrees or more, two straight tooth portions or spaces can be provided at the origin (0 DEG corresponds to 360 DEG) and the center point. At the portion between 0 ° and 90 ° indicated by 14a, the toothed element tilts gradually and tilts to the maximum at 90 °. In the portion of 90 degrees or more indicated by 14b, the slope gradually decreases and becomes 0 (zero) at 180 degrees. Between 180 ° and 270 ° as indicated by 14c, the toothed element is inclined, and is inclined in the direction opposite to that shown in 14a and 14b. The slope decreases between 270 ° and 360 ° (0 °) as indicated by 14d until the slope disappears after being tilted to the maximum at 270 °.

The vibration of the tool holder 6 is therefore effected by the change in the tilt of the specific toothed element 14 which, by engaging the first gear 15 in a straight line, results in the complete movement of the crown gear 12, The same tool holder 6 is tilted differently.

Indeed, not only the transmission ratio of the gear combination defined by the crown gear 12 with the toothed element 13, the third and fourth gears 9 and 10 with the two toothed elements 10 and 11, The vibration speed of the tool holder 6 is determined according to the number of sectors in which the specific tooth element 14 is divided.

As shown in the figure, the first gear 15 can be supported by the corresponding pin 16 provided in the tool holder 6 and disposed perpendicularly to the shaft 7.

Advantageously, the lapping head according to the present invention is capable of achieving gyration continuous radial motion. The alternating continuous radial movement described above can be caused by eccentrically arranging the toothed element 14 with respect to the drive shaft 1 or eccentrically arranging the gear 15 with respect to the pin 16. This radial motion will be proportional to the eccentricity or diameter variation of the gear 15 and the toothed element 14.

Radial movement is particularly advantageous when dressing a diamond tool.

The shaft 7 is supported by a clearance-restoring device, for example a bush 19 connected to the same shaft 7 by a connection having a spring 20 and a ball 21, It will engage with the first support 5.

Furthermore, in order to reduce vibration and provide a polished surface, the support elements 5 can be oscillated with respect to the drive shaft 1 by spring elements 22, 23. A corresponding expansion portion 24 will be provided on the first support 5 so as to coincide with the correlation axis of the shaft 7 when disposed towards the tool holder 6. [

In addition, the second support 17 may be provided with an inner cavity 18 defining a chamber for storing lubricating oil.

Without departing from the scope of the present invention, the details of the nature of the materials used, the placement, size and shape of each element can be modified and remain within the scope of protection provided herein.

Claims (16)

(1) coupled to said coupling device (2), said first and second drive devices being connected to said drive motor by means of a first and second drive device And a holder (6); The first drive device 3, 5 comprises a first body 5 for supporting a tool holder 6 integral with the drive shaft 1 at the time of rotational movement of the drive shaft, A wrapping with a vibrating tool holder in the form of being able to determine the vibration of the tool holder 6 about the axis 7 arranged at a certain angle with the drive shaft 1 as the drive shaft 1 rotates, In the head, The second driving device for transmitting the motion includes a plurality of first gears 15 rotating in a plurality of tool holders 6 and a crown gear 12 connected to the driving motor 1 and driven by the driving motor The crown gear is engaged with the plurality of first gears 15 via the two toothed portions 14 and 15 '. One of the two toothed portions changes in inclination along the advancing direction, Characterized in that the tool holder (6) rotates in said support so as to vibrate when engagement of the toothed portion is made in the portion indicating said lapping head 2. A lapping head according to claim 1, characterized in that the toothed portion with one or more gradient changes along the traveling direction is a toothed portion (14) formed in the crown gear (12) The lapping head according to claim 1, characterized in that the teeth (15), which exhibit one or more tilt changes along the traveling direction, are teeth (15 ') formed on the plurality of gears (15) 2. The lapping head of claim 1, wherein the toothed portion representing at least one tilt change comprises at least one portion having alternating straight and angled portions. 5. The lapping head of claim 4, wherein the toothed portion having one or more tilt changes exhibits an alternating straight portion with an oblique portion. The lapping head according to claim 4, characterized in that the teeth (14) comprise a sloping portion which changes in inclination and direction. The crown gear according to claim 1, wherein the crown gear (12) has a first tooth portion (13) and a second tooth portion (14) and adjusts the rotational motion of the drive shaft Characterized in that gear trains (8, 9) are provided between the first tooth (13) of the crown gear (12) and the drive shaft (1) so as to drive not only the gear but also the crown gear. 8. The crown gear according to claim 7, wherein the gear train comprises two internal toothing elements (10, 11) which can be engaged with the first and second gears (13, And a second gear (8) fixed to the drive shaft (1), the third gear (9) being located in a second support (17) tightly coupled to the support (5) head) The tool according to claim 1, wherein a plurality of first gears (5) are arranged at right angles to the shaft (7) and held by a pin (16) provided on the tool holder (6) Wherein the lapping head is engaged with the first support via a bushing (19) coupled to the same shaft (7) by a connection made up of a restoring device. 10. A lapping head according to claim 9, characterized in that the clearance-restoring device comprises a spring (20) and a ball (21) 2. A lapping head according to claim 1, characterized in that spirals (22, 23) are arranged between the drive shaft (1) and the first support (5) A lapping head according to claim 1, characterized in that, at the part facing the tool holder (6), the first support (5) comprises an expansion part (24) coinciding with the axis of the shaft (7) A lapping head according to claim 1, comprising a second support (17) arranged on the first support (5) with an inner cavity (18) defining a chamber containing lubricating oil. A lapping head according to claim 1, characterized in that the shaft (7) of the tool holder (6) is arranged radially at right angles to the drive shaft (1) A lapping head according to claim 1, characterized in that the crown gear (12) comprises an eccentric tooth (14) with respect to the drive shaft (1) A lapping head according to claim 1, characterized in that the first gear (15) comprises an eccentric tooth (15 ') with respect to the pin (16) supporting the same gear (16)