Field of the Invention
[0001] The present invention concerns a tile-cutting machine, in particular a tile cutter
with rotating square pivoted on the incision axis.
Background Art
[0002] As known, manual tile cutters are portable machines intended to perform the cutting
of ceramic or stone tiles through a manual incision tool.
[0003] Typically they have a support basement wherefrom at least a pair of end posts (head
and tail) extend, between which a (single-bar or double-bar) sliding rail is installed
to guide the manual translation of a tool carrier. Said carrier carries, in its lower
part closest to the support plane of the basement, the actual incision tool, typically
in the shape of a hard-metal cutting wheel. On the basement plane, pairs of floating
plates are preferably provided, on the two sides of a longitudinal ribbing arranged
in correspondence of the incision line.
[0004] In addition to these essential elements, a tile-cutting machine normally has also
a scaled rotating square, pivoting on the machine basement in an end area, against
which the tiles are made to abut to adjust the incision position as desired. For such
purpose, the square is mounted pivoting on the support plane of the basement.
[0005] It is also known that, besides machines wherein the pivoting axis of the square is
offset compared to the incision line, some machines with a rotation axis exactly on
the incision axis have already been suggested, which implies a series of advantages
in their use.
[0006] However, the rotation axis arranged on the incision line is still a source of concern
for the sturdiness of the machine, especially considering that modern tiles, consisting
of tenacious materials (glass, stoneware, ...), require the application of a remarkable
pressure on the tool to be able to be suitably incised.
[0007] The progress made in the choice of materials, both in the pressure die-casting technology
and, finally, the experience acquired in the design and configuration of the frame,
have led to a situation in which the placing of the rotation axis on the incision
line - a concept already known, for example, from
EP 315,728 - no longer represents a big problem and can finally be convenient also for a device
which must fully satisfy a professional buyer in terms of cutting quality, handiness,
ease of use and resistance over time.
[0008] A highly effective machine in this category is the one described for example in
EP1,545,849 in the name of Brevetti Mon-tolit S.p.A.
[0009] Nevertheless, there are still margins for improvement which users demand. In particular,
in order to obtain a suitable sturdiness, the rotating scaled square is still exceedingly
bulky on the support plane in a crosswise direction (which unduly widens the machine
and makes it less portable), as well as making it hard to disassemble. On the other
hand, a sufficientlysturdy square, mounted in a conventional way, as an alternative
could be only taller, which however constrains and affects negatively the positioning
and sizing of the support plates floatingly mounted on the basement.
[0010] Again, the placing and configuration of the locking device of the scaled square (apt
to steadily define the orientation of the square during the incision) are pieces of
criticism to working integrity. As a matter of fact, it is necessary to offer an arrangement
which allows a wide arc of rotation of the square, possibly larger than 90°, and at
the same time a tightening force which does not badly load the rotation pin - which
would end up gripping or acquiring an excessive play in its seat.
[0011] Finally, it should be considered that - whenever the operator prefers never to disassemble
the abutment square (both for convenience and in order not to expose the connection
elements to possible damage) - the overall width of the abutment square is a problem.
As a matter of fact, the abutment bar of the square is of a significant length, i.e.
of the same order of magnitude as the major side of the tile which the machine can
accommodate. Therefore, when it is arranged with an attitude orthogonal to the incision
line, the square offers a substantially unacceptable crosswise bulk during machine
transportation. Even in the case in which the square be rotated and arranged with
an acute angle with respect to the incision line, the square would end up bringing
cantilevered, beyond the head end of the machine, one of its arms, remarkably increasing
its longitudinal extension.
[0012] The object of the present invention is hence that of providing a tile-cutting machine
of a manual type, as summarily described above, equipped with an abutment square with
a centre of rotation on the axis of incision and rotating across a wide arc of a circle,
little bulky crosswise and in height above the support plane, as well as being easy
to disassemble.
[0013] A further object is to provide a machine wherein the bulk of such abutment square,
when not in use, may be reduced without compromising rotation and alignment precision.
Summary of the Invention
[0014] Such objects are achieved by a tile cutter as described, in its essential features,
in the attached claims.
[0015] In particular, according to a first aspect of the invention, a manual tile-cutting
machine is provided, of the type comprising a basement, a translation rail for guiding
a tool-carrying member provided with cutting tool, wherein an abutment square is provided,
rotatably mounted on said basement, which consists of a lower rocker arm, rotatably
mounted below a support plane of the basement, and of an upper rectilinear ruler,
arranged above the support plane and which may be coupled with said rocker arm through
mounting means which run across said support plane.
[0016] Further aspects of the invention are defined in essential terms in the other claims
attached to the present specification.
Brief Description of the Drawings
[0017] Further details on the features and on the advantages of the machine according to
the invention will in any case be more evident from the following description of preferred
embodiments of the same, given by way of example and shown in the attached drawings,
wherein:
fig. 1 is a perspective view of the machine according to the invention with an abutment
square arranged orthogonally to the incision axis;
fig. 2 is a view similar to fig. 1 with the abutment square arranged at a certain
angle with respect to the incision axis;
fig. 3 is a perspective exploded view of the machine according to the invention;
fig. 4 is a bottom plan view of the machine of the invention;
fig. 5 is a perspective view of an embodiment of the invention with a scaled ruler
disassembled;
fig. 6 is a top plan view of the machine of fig. 1, whereon an abutment square is
applied according to a further embodiment;
fig. 7 is a top plan view similar to fig. 6 with the square in a collapsed position;
and
fig. 8 is an exploded, perspective view of the machine of fig. 6.
Detailed Description of Preferred Embodiments
[0018] As visible in fig. 1, a tile cutter consists, in a manner known per se, of a basement
1, pressure die-cast for example of aluminium alloy, wherefrom a first and a second
post 1a and 1b project, between which a guiding and translation rail B is installed.
On the upper plane of basement 1 two floating support plates 2a and 2b are mounted,
which make up the support plane for the tile to be incised.
[0019] On translation bar B a tool carrier 5 is slidably guided, provided with a cutting
tool, such as a special steel wheel (not shown). The coupling between tool carrier
5 and the respective translation rail B also determines the arrangement of the incision
line, commonly arranged exactly below and along the longitudinal axis of rail B, where
a fracturing ribbing 1c integral with basement 1 is also found.
[0020] The shape of the tool carrier establishes the operation thereof, i.e. "push" or "pull",
according to the jargon used in this sector. However, such shape does not influence
the inventive teaching offered here - since the machine can be equipped indifferently
with either tool carrier - and hence it will not be further described in detail.
[0021] At one of the two ends of basement 1 there is traditionally positioned a rotating
scaled square, apt to define a rectilinear edge against which a tile resting on plates
2a and 2b can abut, so as to arrange it and orient it in the desired way with respect
to the incision line.
[0022] According to the invention, the rotating scaled square arrangement consists of a
lower bar or rocker arm 10, rotatably mounted on a central rotation pin 11, and of
a rectilinear ruler (whether or not having a scaled or calibrated lines to measure
distances) 12 which may be coupled in movable way with lower rocker arm 10. Rectilinear
ruler 12 is designed to rotate above the support plane and make up the abutting edge
for the tile to be incised.
[0023] Rocker arm 10 is shaped as a sturdy, rectilinear bar, for example made of steel,
which is housed below basement 1, within a compartment in the bottom of the basement.
Since rocker arm 10 remains entirely contained within the compartment or recess below
the basement, i.e. within the overall thickness of basement 1, rocker arm 10 never
touches an installation surface whereon the machine is placed during operation.
[0024] Rocker arm 10 is rotatably fastened to basement 1 by means of a rotation pin 11,
advantageously arranged in correspondence of the incision line, i.e. on the working
plane of the incision tool. Rocker arm 10 is preferably kept free in rotation adjacent
to the lower surface of basement 1, i.e. the surface S shown in fig. 4.
[0025] In the context of the present description, the specifications "lower" or "upper",
and any other position reference, are intended to refer to the machine in its attitude
of use, i.e. with the basement resting on an installation surface (for example a table
or the floor), capable of providing a reaction to the pressure imparted by the user
on the tool carrier to produce an incision in the tile to be cut.
[0026] According to the embodiment shown in the drawings, pin 11 is a simple bolt which
runs through a hole 11a in the thickness of the basement and a corresponding hole
10a in rocker arm 10. In order to facilitate the mounting thereof, bolt 11 is arranged
with its head in contact with the upper surface of basement 1, while a completion
nut 11b is fastened, from below (i.e. from the lower side of basement 1, as shown
in fig. 4), to the threaded end of bolt 11 and abuts against rocker arm 10.
[0027] Moreover, the rocker arm has a pair of mounting pins 13a and 13b, which extend from
the arm ends. The pins are arranged to run through, with play, a sliding groove 14,
practised in the peripheral area of basement 1, slightly protruding above the support
plane of the machine (as can be appreciated in the illustration of fig. 5). In order
to allow the rotation movement of rocker arm 10 about pin 11, groove 14 runs across
an arc of a circle with centre in pin 11. Preferably, as shown in the drawings, groove
14 runs uninterruptedly across an arc of a circle of about 270° in a symmetrical way
to the incision line, passing externally with respect to one of end posts 1b.
[0028] Accordingly, basement 1 has an end area with a perimeter following externally the
profile of groove 14.
[0029] Preferably, through-pins 13a and 13b are mutually parallel and substantially parallel
to the rotation axis defined by pivoting pin 11.
[0030] Rectilinear, scaled ruler 12 has suitable lower seats (not shown) defined to engage
with mounting pins 13a and 13b. Thereby, since pins 13a and 13b protrude above the
support plane of the machine, ruler 12 is made integral in rotation with rocker arm
10 despite remaining arranged above the support plane, as visible in figs. 1 and 2.
[0031] In particular, ruler 12 remains resting, or slightly detached above (depending on
the type of engagement with pins 13a and 13b), with respect to floating plates 2a
and 2b. The extension of said plates hence is not limited by the presence of abutting
ruler 12, but only partially by the presence of hole 11a.
[0032] Due to the constraint in rotation with rocker arm 10, ruler 12 is rotatably mounted
on a plane parallel to the support plane of the tile, with respect to the rotation
axis defined by pin 11, hence about an axis arranged on the incision line.
[0033] According to a preferred embodiment, ruler 12 and rocker arm 10 can be further connected
through a threaded shaft 15 which may be manoeuvred by a knob 15a. In particular,
ruler 12 has an auxiliary through-hole 12a, preferably obtained in correspondence
of an enlarged portion, which falls in correspondence of a threaded hole 10b obtained
in rocker arm 10. Threaded hole 10b is preferably obtained on a side portion of the
end of rocker arm 10, arranged below groove 14.
[0034] In the condition wherein ruler 12 is coupled with rocker arm 10, engaging through
pins 13a and 13b, threaded shaft 15 is inserted in hole 12a, crosses the thickness
of basement 1 inside groove 14 and then engages with threaded hole 10b.
[0035] The rotation of threaded shaft 15 produces the screwing thereof into hole 10b and
consequently brings knob 15a into abutment against ruler 12, said ruler being hence
caused to come close to rocker arm 10, clamping sandwich-like the basement in between.
The screwing of knob 15a hence causes a locking by friction of ruler 12 and of rocker
arm 10 against basement 1 or floating plates 2a, 2b. It is hence possible to establish
the desired orientation of ruler 12 with respect to basement 1 and hence to lock the
position thereof through knob 15. Two typical operating positions of ruler 12, which
may be kept by acting on knob 15, are shown in figs. 1 and 2 (the position of the
ruler in fig. 2 corresponds to the one taken up in fig. 4).
[0036] Figs. 6-8 show a preferred embodiment.
[0037] In this case, on the basement 1 of the tile-cutting machine an abutment square 112
is rotatably mounted, consisting of a first support frame 113, rotatably mounted on
basement 1 as detailed above (or also in an alternative manner, for example by other
pivoting means), whereon two extension arms or wings 114a and 114b are fastened.
[0038] The frame is configured so as to have a planar limiting plate 113a, arranged parallel
to the support plane of basement 1, and an abutment plane 113b perpendicular to the
support plane. On limiting plate 113a the two extension arms or wings 114a and 114b
are mounted. In particular, these last ones are mounted oscillating, on the plane
defined by the planar limiting plate 113a, by means of hinging means 115, for example
threaded screws or pins which cross the thickness of wings or arms 114a and 114b and
are fastened to frame 113. Hinging means 115 hence define rotation axes perpendicular
to the planar limiting plate, i.e. perpendicular to the support plane of the basement:
consequently, the two arms 114a and 114b are placed in a condition to oscillate on
a plane parallel to the support plane of basement 1.
[0039] The mounting of arms 114a and 114b on limiting plate 113a is loose, so as to allow
the arms to rotate.
[0040] The two arms 114a and 114b are shaped as rectangular-section, prismatic bodies, preferably
hollow, so as to define two perfectly perpendicular sides: one of the sides, the major
one, suited to slide on the plane defined by planar limiting plate 113a, the other
side suited to define an abutment surface for the tile to be cut.
[0041] In any case, regardless of the specific section shape, the two arms 114a and 114b
define two respective abutment edges 114a' and 114b' for the tile, which edges must
be perfectly aligned one to the other during the operating phase of square 112. For
such purpose, it is preferable for the two arms 114a and 114b do not abut directly
on abutment plane 113b, because that would force to machine plane 113b with high precision
and, especially, to define the position of hinging means 115 with respect to the frame
with equal precision. Preferably, instead, abutment plane 113b has adjustment screws
116 against which each of the two respective arms 114a and 114b is meant to abut,
in its operating position. Through the adjustment of adjustment screws 116 it is possible
to obtain a perfect alignment of the two abutment surfaces 114a' and 114b', despite
not requiring excessive machining tolerances for the position of hinging means 115
and of support frame 113. Adjustment screws 116 are arranged between arms 114a and
114b and abutment plane 113b, so that the tile resting on abutment edges 114a' and
114b' tends to push into adjustment the two arms 114a and 114b.
[0042] In the working position, hence, the two arms or wings 114a and 114b are arranged
aligned on support frame 113, as illustrated in fig. 6. The entire square 112 hence
has a crosswise extension sufficient to house a maximum-sized tile for that machine.
In particular, the extension of the entire abutment square 112 can be of the same
order of magnitude as the travel of tool carrier 5.
[0043] Frame 113, and hence the entire square, can be made to rotate about the centre of
rotation on the basement. The rotation of square 112 allows to establish as desired
the orientation of the abutment edge whereon the tile abuts, so as to be able to incise
it along inclined incision lines.
[0044] When the square is no longer used, the two arms 114a and 114b can be collapsed, about
respective hinging means 115, so as to align them substantially parallel to guiding
bar B (fig. 7) and hence dramatically reduce the crosswise bulk of the square, with
no need to disassemble it from the basement.
[0045] In order to limit bulk as much as possible, support frame 113 has an extension not
larger than the diameter of the basement around the centre of rotation of the square.
For the same reason, it is useful that the extension of the two arms 114a and 114b
does not exceed the maximum travel of the tool carrier.
[0046] As can be understood, the configuration proposed here enables the tile cutter to
fully achieve the objects set forth in the preliminary remarks.
[0047] The presence of a fictitious rotation axis for the abutting ruler 12, which is constrained
in rotation through the rocker arm arranged below the basement, advantageously removes
any bulk limitation above the support plane of the machine.
[0048] The sturdiness of rocker arm 10, which may me also be made of a significant thickness
without interfering on the support plane of the machine (since it is arranged below
the basement), removes the need to strengthen transversally ruler 12, which is thus
slender, little bulky and easy to disassemble. The engagement between ruler 12 and
rocker arm 10, defined in two diametrically opposite locations with respect to the
rotation axis (being at the two ends of rocker arm 10) and distant (summarily, the
two pins 13a and 13b are mutually at a distance of the order of magnitude of the width
of the end portion of the machine, for example in the range between 100 mm and 300
mm), ensures a good rigidity of the assembly during use, even without the provision
of strengthening ribbings.
[0049] Since pin 11 has the sole function of defining a fixed rotation axis for rocker arm
10 (hence not other structural support functions, as it instead occurred in the prior
art), it has minimum bulk; accordingly, also hole 11a in the basement does not significantly
affect with the resistance of basement 11 nor does it limit the positioning of the
other machine members.
[0050] The abutment ruler 12 can be easily disassembled, with no risk to lose the centring
on the rotation axis, since the connection means are not close to the rotation axis.
[0051] The angular extension of groove 14 ensures a wide rotation angle of ruler 12.
[0052] Finally, with the oscillating arms the abutment square has a largely reduceable bulk,
without jeopardising square rotation precision and the perfect alignment of the tile
according to the desired incision angle.
[0053] However, it is understood that the invention is not limited to the particular configuration
illustrated above, which represents only a non-limiting example of the scope of the
invention, but that a number of variants are possible, all within the reach of a person
skilled in the field, without departing from the scope of the invention.
[0054] In particular, the mounting and engagement pins between ruler and rocker arm may
also be configured differently. If preferred, it can be provided for example that
a pair of pins be integral with ruler 12 and that they are designed to engage with
corresponding seats obtained at the ends of the underlying rocker arm.
[0055] Finally, although not explicitly illustrated in the drawings, ruler 12 may be provided,
in a conventional way, with a scale or notches for the measuring of the distance from
the rotation axis; similarly, basement 1 has abutment notches with the statement of
the degrees of rotation to make up marks useful to arrange ruler 12 with the desired
angle with respect to the incision line.
1. Manual tile-cutting machine, of the type comprising a basement (1), a translation
rail (B) to guide a tool-carrying member (5) provided with cutting tool, and an abutment
square, rotatably mounted on said basement, characterised in that the abutment square consists of a lower rocker arm (10), rotatably mounted below
a support plane of the basement (1), and an upper rectilinear ruler (12), arranged
above the support plane and which may be coupled with said rocker arm (10) by means
of mounting means (13a, 13b) which cross said support plane.
2. Machine as claimed in claim 1), wherein said rocker arm (10) is rotatably mounted
on a pin (11) arranged on an incision line defined by said cutting tool.
3. Machine as claimed in claim 2), wherein said pin (11) is a bolt constraining the rocker
arm (10) to the basement (1).
4. Machine as claimed in claim 2) or 3), wherein said mounting means (13a, 13b) cross
said support plane in an arc-shaped groove (14) having its centre in said pin (11)
and made in said basement (1).
5. Machine as claimed in claim 4), wherein said mounting means are a pair of pins (13a,
13b) arranged at the ends of said lower rocker arm (10) opposed to the rotation pin
(11).
6. Machine as claimed in any one of the preceding claims, wherein there is further provided
a tightening knob (15, 15a) to bring closer together said upper ruler (12) and said
rocker arm (10) tightening in between said basement (1).
7. Machine as claimed in claim 6), wherein said tightening knob (15, 15a) has a threaded
shaft (15) passing through an auxiliary hole (12a) of said ruler (12) and engaging
with a threaded hole (10b) of said rocker arm (10).
8. Machine as claimed in any one of the preceding claims, wherein said support plane
is defined by at least one pair of floating plates (2a, 2b) arranged on the two parts
of an incision line defined by said cutting tool.
9. Machine as claimed in any one of the preceding claims, wherein said abutment square
(112) consists of a support frame (113), rotatably mounted in a centre of rotation
on said basement, and a pair of rotatably-mounted extension arms (114a, 114b), in
the proximity of respective adjacent ends of said support frame (113), and wherein
said support frame (113) has abutment means (113b, 116) whereon said extension arms
(114a, 114b) are meant to abut so as to have respective abutment edges (114a', 114b')
aligned with each other.
10. Tile-cutting machine as claimed in claim 9, wherein said extension arms (114a, 114b)
are collapsible by at least 90° about respective hinging means (115).
11. Tile-cutting machine as claimed in claim 9 or 10, wherein said extension arms (114a,
114b) are shaped as rectangular-section prismatic bars.
12. Tile-cutting machine as claimed in claim 9, 10 or 11, wherein said abutment means
are shaped as adjustment screws (116) integral with an abutment plane (113b) of said
support frame (113) .