阅读说明：本技术 用于平面片材雕刻设备的具有旋转式托架的工具保持器 (Tool holder with rotary carriage for a flat sheet engraving device ) 是由 L·卡萨尔泰利 文森佐·蒙托利 于 2021-04-08 设计创作，主要内容包括：本发明公开了一种用于平面片材雕刻设备的具有旋转式托架的工具保持器。用于手动雕刻机的工具保持器包括托架(C),该托架配备有至少一个旋转式主体(2),该旋转式主体借助于紧固旋转销(7)相对于支撑基部(1)可旋转地安装,并配备有借助于工具保持装置(6a-6c)紧固的多个雕刻工具(4a-4c)。该旋转式主体(2)可相对于所述支撑基部(1)轴向移位,并通过由旋转主轴(7)约束的第一弹性偏压装置(10、12)而被推靠在支撑基部(1)上。在支撑基部(1)和旋转式主体(2)之间设置有防旋转联接装置(1a、2a、1b、2b),该防旋转联接装置易于通过沿旋转主轴(7)的轴向位移而被释放,并且所述工具保持装置(6a-6c)是可移除的。(A tool holder with a rotary carriage for a flat sheet engraving device is disclosed. The tool holder for a hand-operated engraving machine comprises a cradle (C) equipped with at least one rotary body (2) rotatably mounted with respect to a supporting base (1) by means of a fastening rotation pin (7) and with a plurality of engraving tools (4a-4C) fastened by means of tool holding means (6 a-6C). The rotary body (2) is axially displaceable with respect to said support base (1) and is urged against the support base (1) by first elastic biasing means (10, 12) constrained by the rotary spindle (7). Between the support base (1) and the rotary body (2) anti-rotation coupling means (1a, 2a, 1b, 2b) are provided, which are apt to be released by axial displacement along the rotary spindle (7), and said tool holding means (6a-6c) are removable.)

1. A tool holder for a manual engraving machine, comprising a cradle (C) equipped with at least one rotary body (2) rotatably mounted with respect to a supporting base (1) by means of a fastening rotation pin (7) and with a plurality of engraving tools (4a-4C) fastened by means of tool holding means (6a-6C), characterized in that,

the rotary body (2) is axially displaceable with respect to the support base (1) and is pushed against the support base (1) by first elastic biasing means (10, 12) constrained by the rotary spindle (7), and

between the supporting base (1) and the rotary body (2) anti-rotation coupling means (1a, 2a, 1b, 2b) are provided, apt to be released by axial displacement along the main axis of rotation (7), and which are apt to be released

The tool holding device (6a-6c) is removable.

2. Tool holder according to claim 1, wherein the tool holding means (6a-6c) are held in place by a holding plate (11) pushed against the rotary body (2) by second resilient biasing means, which are constrained by the rotary spindle (7).

3. Tool holder according to claim 2, wherein the holding plate (11) is rotatably mounted around the rotary spindle (7).

4. Tool holder according to claim 3, wherein the holding plate (11) has a star shape with a number of arms (11a-11b) equal to the number of engraving tools (4a-4 c).

5. Tool holder according to claim 2, 3 or 4, wherein the tool holding means (6a-6c) are removable rivets which are held inserted in the respective seating holes by the holding plate (11).

6. The tool holder according to any one of the preceding claims, wherein the rotary body (2) is polygonal in shape and holds the engraving tool (4a-4c) at the vertices of the polygonal shape.

7. Tool holder according to any one of the preceding claims, wherein the rotary spindle (7) engages with a through hole (8) of the support base (1) and is equipped with a retaining ring (9) at the rear side of the support base (1).

8. A tool holder according to any one of the preceding claims, wherein the first resilient biasing means takes the form of a coil spring (10) constrained between a head (7a) of the rotary spindle (7) and a flanged bush (12).

9. A tool holder according to claim 2, wherein the first resilient biasing means (10) and the second resilient biasing means coincide.

Technical Field

The present invention relates to a tool holder for an engraving apparatus for flat sheets of material, such as ceramic tiles, stone, glass or even other materials. In particular, the present invention relates to an improved tool holder equipped with a plurality of interchangeable engraving tools.

Background

In activities of laying and installing ceramic tiles on floors and walls, but more generally in activities of laying and installing planar sheets, devices for engraving the surface of the material are generally used. Engraving devices are commonly used to carry out engraving lines on the surface of tiles/slabs in order to cut said tiles/slabs.

Manual tile cutting machines are known in the art, which comprise a tool holder device slidably mounted on suitable guides and guided by hand during the engraving step.

Two exemplary slidable tool holder devices are shown in fig. 1A and 1B: the former is in the form of a multi-wheel carriage-such as shown in EP2998089 in the name of the same applicant-while the latter comprises a conventional tile cutter handle mounted on a sliding bar. Typically, such prior art devices comprise an engraving tool, e.g. a wheel made of a very hard material such as cemented tungsten carbide, in the lower part, such that the wheel slides under high pressure over the surface of the material to be engraved. In fig. 1A and 1B, the engraving tool is marked by the letter W.

Because engraving tools (e.g., tungsten carbide wheels W) are susceptible to wear and damage during use, certain tools are provided on mounting systems that allow for replacement of the tools.

However, it is a common experience for users that replacement systems for tungsten carbide cemented carbide wheels are not particularly easy to operate. Furthermore, it has been noted that it is not only desirable to replace the engraving tool when it is worn, but also to change the engraving tool in dependence of the material to be engraved, e.g. in dependence of the situation the type of tool material, the geometry of the cutters, the diameter of the wheels, etc.

It would therefore be desirable to have an alternative system of engraving tools which is easier to operate than available in the prior art, in particular for rapidly changing the type of tool.

In the field of manual glass cutters, partial solutions to the problem of wear of engraving tools have been proposed. Some examples are described in US3221405, US1419310, EP 2454. These documents disclose a compact carriage carrying a plurality of identical engraving wheels mounted so as to be able to occupy different stable positions, each time exposing a different new wheel and bringing the worn wheel into an idle position. These arrangements provide a single fastening means which is released to move the position of the carriage and then locked again to enable operation of the tool.

However, some drawbacks arise since the only fastening means may come loose, impairing normal operation; furthermore, once the available wheels are worn, the entire carriage must be replaced or the tool must be replaced. Finally, in the glass field, these bracket devices maintain good function, but in the aggressive environment of the working of machines for floor and wall tiles, they are easily stuck and do not provide any opportunity to maintain or partially replace the tools.

Similar rotary tool carriers are disclosed in US4028801, US1578477, US911342, US 2853907.

Accordingly, there is a need to provide a solution that allows having various engraving tools on the same tool holder while providing ease of replacement and maintenance.

Disclosure of Invention

According to the invention, the above object is achieved by a tool holder provided with a rotary carrier, comprising a carrier equipped with at least one rotary body which is rotatably mounted with respect to a support base by means of a fastening rotation pin and with a plurality of engraving tools fastened by means of a tool holding device. The rotary body is axially displaceable with respect to the supporting base and is urged against the latter by first elastic biasing means constrained by the rotary spindle, and anti-rotation coupling means are provided between the supporting base and the rotary body, apt to be released by axial displacement along the rotary spindle. Furthermore, the tool holding device is removable.

Other preferred features of the tool holder described above are described in additional aspects of the invention described below.

Drawings

Further features and advantages of the solution according to the invention will in any case become more apparent from the following detailed description of a preferred embodiment of the invention, provided purely as a non-limiting example and illustrated in the accompanying drawings, in which:

FIGS. 1A and 1B are side views of two prior art tool holders, as contemplated;

FIG. 2A is an exploded view of a rotary tool holder according to the present invention;

FIG. 2B is a perspective view of a rotating body of the cradle according to the embodiment of FIG. 2A;

FIG. 2C is a perspective view of a small support base of the cradle according to the embodiment of FIG. 2A;

FIG. 3A is a side view of the assembled and locked closed bracket of FIG. 2A in an operative condition;

fig. 3B is a perspective view of the bracket in the state of fig. 3A with a part removed;

FIG. 4A is a side view of the bracket of FIG. 2A in an assembled and released state;

fig. 4B is a perspective view of the bracket in the state of fig. 4A with a part removed;

FIG. 5A is a side view of the carriage of FIG. 4A resiliently opened to change tools;

fig. 5B and 5C are perspective views of the carriage in a tool change state;

FIG. 6A is a perspective view of the carriage of FIG. 4A resiliently opened to replace the tool; and

fig. 6B is a view similar to fig. 6A with the tool removed.

Detailed Description

The tool holder device (not shown) of the manual tile cutter is equipped, in a manner known per se, with an engraving tool, which is usually a hard metal wheel, for example tungsten carbide cemented carbide.

In particular, the tool holder device is equipped with a carrier C on which a plurality of engraving tools, for example three, are arranged. The bracket C is fastened to the lower part of the tool holder arrangement in any suitable manner, for example by welding or riveting or by other fastening means.

According to the invention, the carrier C comprises a support base 1 attached to the tool holder device, on which support base a rotary body 2 is rotatably mounted, which rotary body holds two or more engraving tools 4 a-4C. These engraving tools are in the form of wheels 4a-4c with parallel rotation axes, these wheels 4a-4c being mounted in respective housing seats 5a-5c arranged at projecting portions of the rotary body 2, in particular in housing seats at the corners of a substantially polygonal shape (triangular in the case of three tools as in the figures).

The engraving wheels 4a-4c are held in the respective seats 5a-5c by means of retaining pins 6a-6c which are easy to fit into and remove from the respective receiving holes. The removable retaining pins 6a-6c have an enlarged end for abutting against the inlet orifice of the receiving hole so as to be axially held in place.

The wheels 4a-4c have different diameters and may also have different shapes and materials.

The rotary body 2 is rotatably mounted on the support base 1 by means of a rotary spindle 7 which is fitted into a through hole 8 of the base 1 and is axially retained (so that it cannot slip) by means of a rear retaining ring 9 (e.g. a siege ring or the like) which engages with a corresponding groove 9a at the distal end of the spindle 7.

Furthermore, the spindle 7 has a head 7a by means of which the spindle holds the rotary body 2 against the base 1. The short portion 7b of the main shaft 7 is threaded and is intended to engage with a nut provided in the through hole 8.

Thus, the axial coupling between the base and the rotary body 2 is ensured by the rotary spindle 7. On the contrary, the anti-rotation coupling between the base 1 and the rotary body 2 is ensured by a plurality of pins 1a and radial projections (relief)1b, these pins 1a and radial projections 1b projecting axially from the base 1 and being inserted in corresponding clamping holes 2a and radial recesses 2b provided in the rotary body 2. According to the embodiment shown, the pins 1a protrude more than the radial projections 1b, these radial projections 1b being flush with the circular rim 1 c. Thus, radial recesses 2b are formed on the inner disc of a circular groove 2c provided on the rotary body 2, wherein the pin 1a can slide during mutual rotation between the base 1 and the rotary body 2.

When the base 1 and the rotary body are adjacent to each other (e.g. fig. 3A), the pin 1a and the radial projection 1b engage with the hole 2a and the recess 2b, respectively, thus preventing mutual rotation. When the base 1 and the rotary body 2 are separated from each other (for example fig. 5A), the pin 1a and the radial projection 1b come out completely from the hole 2a and the recess 2b and can perform a relative rotation around the rotation spindle 7.

The radial distance between the pin 1a and the spindle 7 is the same; furthermore, the pins 1 are at the same circumferential distance from each other. Thus, a stable coupling position between the base 1 and the rotary body 2 can be identified every 360/N degrees, where N is the number of pins 1 and tools.

According to a unique feature of the invention, between the head 7a of the rotating spindle 7 and the rotating body 2 there is provided a biasing spring 10 exerting a spring action for urging the rotating body 2 against the base 1 in a "pocket-wise" manner.

Furthermore, between the head 7a of the spindle 7 and the rotary body 2 there is preferably provided a retaining plate 11 for abutting against the enlarged end of the retaining pins 6a-6c to hold it in position without allowing it to be removed from the respective hole. Furthermore, a holding plate 11 is rotatably mounted on the spindle 7: to this end, the retaining plate has a central hole 11' equipped preferably with a flanged cylindrical bush 12 against which the spring 10 abuts.

Preferably, the retaining plate 11 is star-shaped, having a number of arms 11a-11c equal to the number of tools, which rest on the enlarged ends of the pins 6a-6c to push them and retain them in their receiving holes. At least one of the arms 11a-11c also has a recess 11 "for engaging the enlarged head of the respective pin 6a and preventing rotation of the star plate 11 relative to the rotary body 2.

In general, the retaining plate 11 can occupy two different rotational positions: one of which is a rotational position that maintains the pins 6A-6C in the respective receiving holes (see, e.g., fig. 5B and 5C), and one of which is a rotational position that releases the enlarged ends of the pins 6A-6C and allows for removal of the tool (see, e.g., fig. 6A and 6B).

As can also be seen with the aid of the figures, the bracket according to the invention has two distinct features. On the one hand, the rotary body 2 holding the tools 4a-4c is coupled with the support base 1 via the rotary spindle 7 by arranging elastic biasing means 10 therebetween. On the other hand, the tools 4a-4c are constrained to their seats 5a-5c by removable retaining pins 6a-6c, which, according to a preferred embodiment, are held in position by a retaining plate 11 also pushed against the rotary body 2 by the rotary spindle 7, wherein elastic biasing means 10 are arranged between the rotary spindle 7 and the rotary body 2.

Thus, by rotating the rotary body 2, the operation of the carrier C provides an opportunity to easily change the tool used and to easily replace the tool from the carrier C.

Fig. 3A and 3B show the operating state of the bracket C in which the spindle 7 is fully tightened. The threaded portion 7b is screwed completely into the hole 8, and the end holding ring 9 protrudes from the rear side of the base 1. The spring 10 is fully compressed and the rotary body 2 is firmly coupled with the base 1. Any relative rotation of the parts is prevented even under stress due to the effect of the pressure applied manually during the engraving of the tool against the operating surface (not shown).

In fig. 4A and 4B, a state is shown in which the spindle 7 is completely released and the carriage is ready to be changed. The retaining ring 9 abuts against the rear side of the base 1, preventing the spindle 7 from slipping off completely. The spring 10 is stretched but exerts a biasing force sufficient to keep the plate 11 still against the rotating body 2 and the body is coupled against the base 1. From this state, the user can change the position of the tools 4a-4c, change the tool in the position of use, or replace a single tool from its seat.

Acting on the rotary body 2 and against the opposing action of the spring 10, it is possible to move the rotary body 2 axially away from the base 1 (fig. 5A) until the pin 1a is removed from the corresponding hole 2a and thus a relative rotation can be produced between the rotary body and the base. Thus, the user can rotate the rotary body 2 and switch the tool (see the comparison between fig. 5B and 5C) until the desired tool is brought to the use position.

If, conversely, the retaining plate 11 is moved away from the rotary body 2 by acting on it, the recess 11 "can be disengaged from the enlarged end of the pin 6A, thus causing the plate 11 to rotate with respect to the rotary body 2, as shown for example in figure 6A. In this case, the retaining pins 6a-6c can be removed from the respective holes, thus releasing the wheels 4a-4c, so that the wheels 4a-4c can be easily replaced.

From the above description it can be surmised that the innovative layout of the cradle according to the invention fully achieves the aims set forth in the preamble.

In fact, due to the presence of the rotating spindle 7 cooperating with the spring 10, three different states can be simultaneously achieved: a fully operational locked state, an unconstrained tool change position, and an unconstrained tool replacement state. The two unconstrained states make tool changes and tool replacement operations very easy.

Furthermore, the presence of the spring 10 reduces the risk of undesired loosening of the pin 7 and still ensures taking up any slack, which ensures the full function of the device in any condition.

It is understood that the invention must not be considered limited to the particular embodiments shown, but that various modifications are possible, all within the reach of a person skilled in the art, without departing from the scope of protection of the invention, which is limited solely by the claims appended hereto.

For example, although in the description reference is always made to a rotary body having three tools and a star-shaped holding plate, it is not excluded that it is also possible to support only two tools or four or more tools, depending also on the volume of each tool and the available space on the tool holding device for mounting the carrier. In the case of two tools, the retaining plate may simply be rectangular. In any case, the holding plate may be divided into a plurality of individual elements.

Furthermore, the retaining means of the tool may also be simple removable pins that are locked in place in some other way without the use of a retaining plate.

Furthermore, the most widely used tools are of course hard metal wheels, but it is not excluded that the principles taught herein can be applied to engraving tools of different shapes.

Finally, it is not excluded that the elastic means may be more than one, for example in order to differentiate between the elastic forces exerted towards the rotary body 2 and towards the retaining plate 11.