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Title:
A BASE FOR SEWING MACHINES
Document Type and Number:
WIPO Patent Application WO/2012/150536
Kind Code:
A2
Abstract:
The base (1) enables alternatingly associating various crochet-bearing groups to a sewing machine (M). The base (1) comprises a column bearing structure (10), fixed on a support table (100) and designed to support at a top thereof a head (T) of the sewing machine (M), in predetermined longitudinal positions, The bearing structure (10) houses an electric motor (E) for activating the machine (M) and the corresponding crochet-bearing group (PC), via transmission organs, The bearing structure (10) internally comprises upper coupling means (3), to which a relative crochet-bearing group (PC) identified in a first series (31, 32, 33) is associable, and lower coupling means (4), to which a relative crochet-bearing group (PC) identified in a second series (41, 42, 43, 44) is associable.

Inventors:
CENTANNI FIORINI MASSIMO (IT)
Application Number:
PCT/IB2012/052132
Publication Date:
November 08, 2012
Filing Date:
April 27, 2012
Export Citation:
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Assignee:
CIUCANI MOCASSINO MACHINERY S R L (IT)
CENTANNI FIORINI MASSIMO (IT)
International Classes:
D05B15/00
Domestic Patent References:
WO2003052192A12003-06-26
WO2008007191A12008-01-17
WO2008083528A12008-07-17
Foreign References:
CN2706493Y2005-06-29
CN2500696Y2002-07-17
GB191319092A1914-08-20
ES2052419A21994-07-01
Attorney, Agent or Firm:
DALL'OLIO, Daniele et al. (Via Delle Armi 1, Bologna, IT)
Download PDF:
Claims:
CLAIMS

1. A base for sewing machines, characterised in that it comprises: a bearing structure (10), fixed on a support table (100.) and designed to support, at a top thereof, a head (T) of a machine of the sewing machines (M); flange means (11), interposed between the bearing structure (10) and the head (T), suitable to enable blocking of the head (T) in different positions, such as to vary a projection thereof with respect to the bearing structure (10); upper coupling means (3), to which a relative crochet-bearing group (PC) is associable, identified in a first series (31 , 32, 33); lower coupling means (4), to which a relative crochet-bearing group (PC) is associable, identified in a second series (41), (42), (43), (44); transmission means (20), at least partially housed in the bearing structure (10), activated by an electric motor (E) with interposing of a clutch device (F), which transmission organs (20) are destined to supply drive to organs of the head (T) as well as relay organs provided in the crochet-bearing group (PC).

2. A base for sewing machines, characterised in that it comprises: a bearing structure (10), fixed on a support table (100) and destined to support, at a top thereof, a head (T) of a machine of the sewing machines (M); flange means (11), interposed between the bearing structure (10) and the head (T), suitable to enable blocking of the head (T) in different positions, such as to vary a projection thereof with respect to the bearing structure (10); upper coupling means (3), to which a relative crochet-bearing group (PC) is associable, identified in a first series (31 , 32, 33); transmission means (20), at least partially housed in the bearing structure (10), activated by an electric motor (E) with interposing of a clutch device (F), destined to supply drive to means of the head (T) as well as to relay means provided in the crochet-bearing group (PC).

3. A base for sewing machines, characterised in that it comprises: a bearing structure (10), fixed on a support table (100) and designed to support, at a top thereof, a head (T) of a machine of the sewing machines (M); flange means (11), interposed between the bearing structure (10) and the head (T), suitable to enable blocking of the head (T) in different positions, such as to vary a projection thereof with respect to the bearing structure ( 0); lower coupling means (4), to which a relative crochet-bearing group (PC) is associable, identified in a second series (41), (42), (43), (44); transmission means (20), at least partially housed in the bearing structure (10), activated by an electric motor (E) with interposing of a clutch device (F), destined to supply the drive to means of the head (T) as well as to relay means provided in the crochet-bearing group (PC).

4. The base of claim 1 or 2 or 3, characterised in that the bearing structure (10) exhibits a column shape and is internally hollow.

5. The base of claim 1 or 2 or 3, characterised in that the flange means (11) are constituted by a plate affording holes for fastening a rear turret (Tp) exhibited by the head (T) with different amounts of projection with respect to the bearing structure (10). 6. The base of claim 1 , characterised in that the transmission means (20) comprise: a drive pulley (21 M), keyed on the outlet shaft of the electrical motor (E), connected by a trapezoid belt (21) to a driven pulley (21C), the driven pulley (21 C) being associated to the clutch device (F); a splined shaft (22), associated coaxially to the driven pulley (2 C) and clutch device (F) and supported, with a horizontal axis, internally of the bearing structure (10), in the upper part thereof; a first cogged pulley (23A), slidably coupled on the splined shaft (22) and positionable such as to be aligned with a corresponding second cogged pulley (23B), keyed on a drive shaft (B) housed in the head (T); a first cogged belt (23), suitable for connecting the first and second cogged pulleys (23A), (23B); a first connecting joint (24), solidly connected to the splined shaft (22) at the head facing towards the upper coupling means (3), destined to engage with relay means present at each of the crochet-bearing groups (31 , 32, 33) of the first series; a third cogged pulley (25A), coupled in a fixed position on the splined shaft (22), destined to draw in rotation, by means of a second cogged belt (25), a fourth cogged pulley (25B) keyed on a shaft (26), supported, with a horizontal axis, internally of the bearing structure (10), in the lower part thereof; a second connecting joint (27), solidly connected to the shaft (26) at the head facing towards the lower coupling means (4), destined to engage with relay means present in each of the crochet-bearing group (41), (42), (43), (44) of the second series.

7. The base of claim 2, characterised in that the transmission means (20) comprise: a drive pulley (21 M), keyed on the output shaft of the electric motor (E), connected by means of a trapezoid belt (21) to a driven pulley (21 C), the driven pulley (21C) being associated to the clutch device (F); a splined shaft (22), associated coaxially to the driven pulley (21C) and the clutch device (F) and supported, with a horizontal axis, internally of the bearing structure (10), in an upper part thereof; a first cogged pulley (23A), slidably coupled on the splined shaft (22) and positionable such as to be aligned with a corresponding second cogged pulley (23B), keyed on a drive shaft (B) housed in the head (T); a first cogged belt (23) destined to connect the first and second cogged pulleys (23A), (23B); a first connecting joint (24), solidly constrained to the splined channel (22) at the head facing towards the upper coupling means (3), destined to engage with relay means present in each of the crochet-bearing groups (31), (32), (33) of the first series.

8. The base of claim 1 , characterised in that the transmission means (20) comprise: a drive pulley (21 M), keyed on the output shaft of the electric motor (E), connected by means of a trapezoid belt (21) to a driven pulley (21C), the driven pulley (21 C) being associated to the clutch device (F); a splined shaft (22), associated coaxially to the driven pulley (2 C) and the clutch device (F) and supported, with a horizontal axis, internally of the bearing structure (10), in an upper part thereof; a first cogged pulley (23A), coupled slidably on the splined shaft (22) and positionable such as to be aligned with a corresponding second cogged pulley (23B), keyed on a drive shaft (B) housed in the head (T); a first cogged belt (23) destined to connect the first and second cogged pulleys (23A), (23B); a third cogged pulley (25A), coupled in a fixed position on the splined shaft (22), destined to draw in rotation, by means of a second cogged belt (25), a fourth cogged pulley (25B) keyed on a shaft (26), supported, with a horizontal axis, internally of the bearing structure (10), in a lower part thereof; a second connecting joint (27), solidly constrained to the shaft (26) at the head facing towards the lower coupling means (4), destined to engage with relay means present in each of the crochet-bearing group (41), (42), (43), (44) of the second series.

9. A base for sewing machines, characterised in that it comprises: a bearing structure (10), fixed above a support table (100) and designed to support, at a top thereof, a head (T) of a machine of the sewing machines (M); flange means (11), interposed between the bearing structure (10) and the head (T), suitable to enable blocking of the head (T) in different positions, such as to vary a projection with respect to the bearing structure (10); a bracket (301), fixed to the head (T) of the sewing machine, which supports a crochet-bearing group (30); transmission means (20), at least partially housed in the bearing structure (10), activated by an electric motor (E) with interposing of a clutch device (F), destined to supply drive to means of the head (T) as well as to relay means provided in the crochet-bearing group (30).

Description:
A BASE FOR SEWING MACHINES

FIELD OF THE INVENTION

The invention relates to the technical sector of sewing machines, with special reference to the machines which realised knotted sewing stitches, used for sewing shoes, leather articles and the like.

Among the above-mentioned machines, we consider those in which at least a straight needle is present, projecting downwards, from the free end of the head towards an underlying rotary hook device, commonly called a crochet, which incorporates a spool of thread and cooperates with the needle to form knotted stitches.

The crochet, which can have a horizontal, vertical or inclined rotation axis, is supported at the end of a crochet-bearing group; the conformation and the peculiarities of the group, as well as the orientation of the crochet axis, define the characteristics of the machine and make it suitable for carrying out specific work operations.

The crochet and part of the relative group bearing it are positioned internally of the article being processed and must enable the article to assume the suitable positions for all the zones to be sewn to be reached.

DESCRIPTION OF THE PRIOR ART

Fixed-type crochet-bearing groups are known, for example with an arm or column, and other groups are mobile, in which a profiled arm (for example V or C or L or U shaped) is present, which can oscillate with a predetermined angular range, or can also freely rotate in the two directions, with respect to a base solidly constrained to the rear turret conformed from the head of the machine.

The base has a shape and dimensions that are designed according to the conformation of the crochet-bearing group.

In some embodiments, the oscillating plane (or rotating plane) of the profiled arm is parallel to the rotating plane of the crochet, while in other embodiments it is perpendicular and in others besides it is inclined. In any case, known orientating means are interposed between the profiled arm and the crochet, which means are suitable for maintaining the position of the crochet fixed independently of the position assumed by the profiled arm.

During work operations, the mobile arm is displaced by the operator, manually or by means of motorised organs, into the position which is time by time most favourable such as not to interfere with the article in its present arrangement.

The drive shaft of the machine, housed in the head and on which the up and down motion of the needle depends, drives and activates, in phase, the rotation of the crochet; to this end suitable transmission organs must be provided which, first through the base, then through the crochet-bearing group, transmit the drive to the relative crochet.

In the case of crochet-bearing groups with a mobile profiled arm, the transmission organs have to be conformed in such a way as not to modify the phase between the needle and crochet with respect to the movements of the arm. Some types of machine, destined to special work operations, are differentiated from others in that they use an elongate head, which increases the projection between the needle and the rear turret of the head, such as to facilitate the manoeuvring of larger articles. In practice, the various machine models required to carry out the various work operations are obtained by setting up, in suitable combination, a head, in the long or short version, a special crochet- bearing group, fixed or mobile, which determines a predetermined arrangement of the crochet, and a base having a shape and dimensions suitable for supporting the head and the crochet-bearing group.

The different characteristics of each base mean that specific support bases of the machine have to be predisposed, such that the base is always in an economically correct position with respect to the operator.

In every machine model, therefore, there co-exist a series of common parts and a certain number of specific parts belonging to each set-up. The specific parts are produced in limited numbers with respect to the common parts, and therefore inevitably are more expensive than them.

In some cases, as in the fusion of bases and/or components of the support tables, these costs are further increased, as due to work requirements a small batch number is imposed, which at times is greater than demand at a given moment; in these cases a certain number of pieces can remain in the warehouse for long periods, with an obvious further increase in costs.

With present production criteria, therefore, a manufacturer who wishes to put a well-assorted range of machines on offer for the various operations faces very high costs for design, manufacturing, storing and management of exchange parts of a large number of parts; these costs, inevitably, have an effect on the sale price of the machines and/or on the profit margin.

Today's market requirements require large flexibility in order to rapidly respond to market demand; this is true both for manufacturers of machines and for users of those machines, who almost always work in goods sectors that are strongly influenced by seasonal criteria and fashion, and often have to be ready to produce articles in limited quantities.

For the above reasons, therefore, quite frequently a user of a machine finds himself in a difficult situation, i.e. of not possessing the correct version for a new work operation, not being able to convert the existing machine to a new work set-up because it is not economical to do so, and not finding any worthwhile gain in buying a new and specifically set-up machine, which, due to the high costs bearing on the manufacturer, is first and foremost rather expensive. SUMMARY OF THE INVENTION

The aim of the present invention is therefore to disclose a base for sewing machines, conformed such as to be suitable for all the configurations and setups of the machine, such as to have a greater number of parts in common. A further aim of the invention is to provide a base which enables maintaining the support table of the machine unchanged for all set-ups.

A still further aim of the invention relates to the desire to modify, thanks to the base of the invention, the production criteria of the machine, such as to make them more flexible and economical. A further aim of the invention consists in providing a base which, thanks to the improvements in the construction of the machine, enables the user to replace, at a later date, one set-up with another, while only changing a limited number of parts, such as to make the change economically acceptable.

The above aims are entirely attained by a base for sewing machines, comprising: a bearing structure, fixed on a support table and designed to support, at a top thereof, a head of a machine of the sewing machines; flange means, interposed between the bearing structure and the head, suitable to enable blocking of the head in different positions, such as to vary a projection thereof with respect to the bearing structure; upper coupling means, to which a relative crochet-bearing group is associable, identified in a first series; lower coupling means, to which a relative crochet-bearing group is associable, identified in a second series; transmission means, at least partially housed in the bearing structure, activated by an electric motor with interposing of a clutch device, which transmission means are destined to supply drive to organs of the head as well as to relay organs provided in the crochet-bearing group.

The base of the invention, thanks to the original conformation thereof which includes a single bearing structure for all the machine configurations, enables wide possibilities of diversification in production, with a large number of parts in common.

For this reason the flange means advantageously enable varying the projection of the head with respect to the bearing structure of the base, enabling use of one type only of head for all the set-ups.

The unified bearing structure enables maintaining the support table of the machine the same for all the set-ups thereof.

The special characteristics of the base of the invention enable achieving important reductions in manufacturing costs of the machines, thanks to the synergy given by the large number of parts in common and the consequent possibility of organising the production criteria in a more rational way. The above advantages further enable rapid preparation of the machine setups according to orders, and in line with the requirements of maximum flexibility and minimum use of resources.

A further advantage that the invention offers to the machines is the benefit to the customer, and relates to the possibility for the customer to replace, at a later date, one set-up with another, by changing a limited number of parts, with a technically simple and economically acceptable operation.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics of the invention will more fully emerge from the following description of a preferred embodiment of the base of the invention, according to what is included in the claims and with the aid of the accompanying tables of drawings, in which: • Figure 1 is a lateral view of the base of the invention combined with a first set-up of the sewing machine;

• Figure 2 is a lateral view of the base of the invention in combination with a second set-up of the sewing machine; · Figure 3 is a lateral view of the base of the invention in combination with a third set-up of the sewing machine;

• Figure 4 is a lateral view of the base of the invention in combination with a fourth set-up of the sewing machine;

• Figure 5 is a lateral view of the base of the invention in combination with a fifth set-up of the sewing machine;

• Figure 6 is a lateral view of the base of the invention in combination with a sixth set-up of the sewing machine;

• Figure 7 is a lateral view of the base of the invention in combination with a seventh set-up of the sewing machine; · Figure 8 is a lateral view of the base of the invention in combination with an eighth set-up of the sewing machine.

DESCRIPTION OF PREFERRED EMBODIMENTS

With reference to the figures of the drawings, 1 denotes the base of the present invention, in its entirety.

The base 1 is fixed on a support table 100 and is and destined to support, at a top thereof, a head T of a known sewing machine, for example a type having a knotted stitch, denoted in its entirety by M.

As already described herein above, at least a sewing needle A is present in these machines M, which projects inferiorly from the free end of the head T towards an underlying rotating hook C device, commonly known as a crochet; the crochet incorporates a spool of thread (also not illustrated) and cooperates with the needle A for forming knotted stitches.

As already mentioned, the crochet C can have a horizontal, vertical or inclined rotation axis, and is supported at the end of a crochet-bearing group PC different for each version of the machine M.

For many set-ups of the machine M, the base 1 is further destined to support the crochet-bearing group PC, as will be more fully described in the following.

For all the above-mentioned set-ups, the base 1 comprises a bearing structure 10, substantially in a column form, internally hollow, predisposed to be blocked to a main plane 101 of the support table 100.

Flange means 11 are provided at the top of the bearing structure 10, which means 11 are interposed between the bearing structure 10 and the rear turret Tp of the head T. The flange means 11 are constituted, for example, by a plate which enables the blocking of the rear turret Tp in various positions along the development direction of the head T, such as to vary the projection of the needle A with respect to the bearing structure 10; to this end, the plate 11 affords appropriate holes, also in a slot form, not illustrated, which can be engaged by conventional screw fastening organs. Upper coupling means 3 are afforded in the head 10A of the bearing structure 10, which upper coupling means 3 are usable for constraining to the structure 10 a crochet-bearing group PC identified in a first series composed, for example, by three variants 31 , 32, 33 (figures 2, 3, 4).

The upper coupling means 3 comprise, for example, a series of threaded holes, not illustrated in detail, destined to be engaged by corresponding screws.

Lower coupling means 4 are further included in the head 10A, for constraining to the structure 10 a crochet-bearing group PC identified in a second series composed, for example, by four variants 41 , 42, 43, 44 (figures 5, 6, 7, 8) The lower coupling means 4 also comprise, for example, a series of threaded holes, not illustrated in detail, destined to be engaged by corresponding screws.

In the preferred embodiment of the invention, illustrated in the figures, the bearing structure 10 is destined to house internally thereof the electric motor E which powers the machine M.

The electric motor E is fixed by suitable attaching means, not illustrated in detail, constituted for example by a series of threaded holes with relative screws, or nuts and bolts. Transmission organs 20 are connected to the output shaft of the electric motor E, which organs 20 are destined to set the drive shaft B of the machine M in rotation, such as to activate the shaft B and the relative needle A, as well as relay organs provided in the crochet-bearing groups PC for activating the relative crochets C, as specified herein below. For this purpose the transmission organs 20 comprise: a drive pulley 21 M, keyed on the outlet shaft of the electrical motor E, connected by a trapezoid belt 21 to a driven pulley 2 C, the driven pulley 21 C being associated to the clutch device F of known type; a splined shaft 22, associated coaxially to the driven pulley 21 C and clutch device F and supported, with a horizontal axis, internally of the bearing structure 10, in the upper part thereof; the clutch device F is destined to deconstrain the drawing of the splined shaft 22 by the driven pulley 21 C on reaching a predetermined maximum resistant torque; a first cogged pulley 23A, slidably coupled on the splined shaft 22 and positionable such as to be aligned with a corresponding second cogged pulley 23B, keyed on a drive shaft B, with which it is enmeshed by means of a first cogged pulley 23; a first connecting joint 24, solidly connected to the splined shaft 22 at the head facing towards the upper coupling means 3, destined to engage with relay means present at each of the crochet-bearing groups 31 , 32, 33 of the first series; a third cogged pulley 25A, coupled in a fixed position on the splined shaft 22, destined to draw in rotation, by means of a second cogged belt 25, a fourth cogged pulley 25B keyed on a shaft 26, supported, with a horizontal axis, internally of the bearing structure 0, in the lower part thereof; a second connecting joint 27, solidly connected to the shaft 26 at the head facing towards the lower coupling means 4, destined to engage with relay means present in each of the crochet-bearing group 41 , 42, 43, 44 of the second series.

The various set-ups of the machine M, illustrated for example non-limitingly in the accompanying figures, are of a suitable combination between a predetermined position of the head T with respect to the bearing structure 10 and the choice of a determined crochet-bearing group PC, as described in the following.

For at least a first set-up of the machine M, illustrated in figure 1, a known crochet-bearing group PC is comprised, denoted by 30, of a type to be fixed to the head T by means of a bracket 301 , which bracket 301 oscillatingly bears a C-shaped arm 302 in a vertical axis.

The axis of the crochet C is also vertical and coincides with the oscillation axis of the arm 302; by means of orientating means (not illustrated in detail), interposed between the arm 302 and the crochet C, the position of the crochet is kept fixed independently of the position assumed by the profiled arm 302. The rotation of the crochet C, in suitable phase relation with the movements of the needle A, is impressed by a cascade of gearings housed internally of the bracket 301 and the arm 302, which take motion from the drive shaft B.

For the first set-up the head T is fixed in a retracted position R which involves a corresponding retraction of the first cogged pulley 23A along the splined shaft 22.

In this set-up of the machine, illustrated in figure 2, a first crochet-bearing group PC is provided, belonging to the first series, denoted by reference numeral 31. The first crochet-bearing group 31 comprises, in a known way, a V-shaped arm 311 , oscillating according to a horizontal axis coinciding with the rotation axis of the relative crochet C; by means of relative orientating means (not illustrated), the position of the crochet C is kept fixed independently of the position assumed by the arm 311. The first crochet-bearing group 31 is fixed to the bearing structure 10 at the upper coupling means 3, connecting the relay organs thereof (not illustrated) to the first connecting joint 24 in order to enable the splined shaft 22 to draw in rotation and thus move the relative crochet C.

In this second set-up too, the head T is fixed in the retracted position R. For a third set-up of the machine M, illustrated in figure 3, a second crochet- bearing group PC is comprised, belonging to the first series, denoted by reference number 32.

The second crochet-bearing group 32 is similar to the first group 31 , with the only difference being the greater dimensions of the relative oscillating arm 321.

The second crochet-bearing group 32 is fixed to the bearing structure 10 at the upper coupling means 3, connecting the relay organs thereof (not illustrated) to the first connecting joint 24 in order to enable the splined shaft 22 to draw them in rotation and thus move the relative crochet C. For the third set-up, the head T is fixed in a first advanced position H1 , which involves a corresponding advancing of the first cogged pulley 23A along the splined shaft 22. For a fourth set-up of the machine M, illustrated in figure 4, a third crochet- bearing group PC is comprised, belonging to the first series, denoted by reference numeral 33.

The third crochet-bearing group 33 comprises, in a known way, an arched arm 331 , oscillating according to an axis that coincides with the rotation axis of the relative crochet C; in this case too relative orientation means (not illustrated) are comprised for maintaining the position of the crochet C fixed.

The third crochet-bearing group 33 is fixed to the bearing structure 10 at the upper coupling means 3, connecting the relay organs thereof (not illustrated) to the first connecting joint 24 in order to enable the splined shaft 22 to draw them in rotation and therefore move the relative crochet C.

The special arrangement of the organs provided in the third crochet-bearing group 33 for engaging with the upper coupling means 3 result in an inclined position of the oscillating axis of the arched arm 331 and the rotation axis of the crochet C.

For the fourth set-up, the head T is fixed in a second advanced position H2, which involves a corresponding advancing of the first cogged pulley 23A along the splined shaft 22.

For a fifth set-up of the machine M, illustrated in figure 5, a first crochet- bearing group PC is comprised, belonging to the second series, denoted by reference numeral 41.

The first crochet-bearing group 41 comprises a fixed vertical arm 411 at a top of which the relative crochet C is borne, with a horizontal rotation axis.

The base of the fixed vertical arm 411 is solidly constrained to a first box element 412, having a horizontal development, destined to be fixed to the bearing structure 0 at the lower coupling means 4.

Relay organs are present internally of the fixed vertical arm 411 and the first box element 412, which relay organs are denoted in their entirety by 201 and are visible only in part, and are destined to be connected to the second connecting joint 27 in order to enable the shaft 26 to draw them in rotation and to therefore move the crochet C.

For the fifth set-up, the head T is fixed in an advanced third position H3, which involves a corresponding advancing of the first cogged pulley 23A along the splined shaft 22.

For a sixth set-up of the machine M, illustrated in figure 6, a second crochet- bearing group PC is comprised, belonging to the second series, denoted by reference numeral 42. The second crochet-bearing group 42 comprises a V-shaped arm 421 , oscillating about an inclined axis with respect to the vertical, coinciding with the rotation axis of the crochet C; in this case too relative orientating means (not illustrated) are comprised for maintaining the position of the crochet C fixed. The arm 421 is hinged to a second box element 422, having a horizontal development, destined to be fixed to the bearing structure 10 at the lower coupling means 4.

Relay organs are present internally of the arm 421 and the second box element 422, denoted in their entirety by 202 and only partly visible, destined to be connected to the second connecting joint 27 in order to enable the shaft 26 to draw them in rotation and therefore move the relative crochet C.

For the sixth set-up, the head T is fixed in the third advanced position H3.

For a seventh set-up of the machine M, illustrated in figure 7, a third crochet- bearing group PC is comprised, belonging to the second series, denoted by reference numeral 43.

The third crochet-bearing group 43 comprises a C-shaped arm, oscillating about a vertical axis and arranged in such a way that the encumbrance thereof is facing on an opposite side with respect to the bearing structure 10. The crochet C is arranged with a horizontal axis; in this case too orientating means (not illustrated) are provided, for maintaining the position thereof fixed.

The arm 431 is hinged to a third box element 432, having a horizontal development, destined to be fixed to the bearing structure 10 at the lower coupling means 4.

Relay organs are present internally of the arm 431 and the third box element 432, denoted in their entirety by 203 and only partly visible, suitable for being connected to the second connecting joint 27 in order to enable the shaft 26 to draw them in rotation and thus move the relative crochet C. For the seventh set-up, the head T is fixed in the third advanced position H3.

For an eighth set-up of the machine M, illustrated in figure 8, a fourth crochet- bearing group PC is comprised, belonging to the second series, denoted by reference numeral 44.

The fourth crochet-bearing group 43 comprises a C-shaped arm 441 oscillating about a vertical axis and arranged in such a way that the encumbrance thereof is facing towards the bearing structure 10.

The relative crochet C is arranged with a horizontal axis; in this case too relative orientating means (not illustrated) are comprised, for maintaining the position thereof fixed. The arm 441 is hinged to a fourth box element 442, having a horizontal development, destined to be fixed to the bearing structure 10 at the lower coupling means 4.

Relay organs are present internally of the arm 411 and the fourth box element 442, which organs are denoted in their entirety by 204 and are only partly visible, destined to be connected to the second connecting joint 27 such as to enable the shaft 26 to draw them in rotation and thus to move the relative crochet C. For the eighth set-up, the head T is fixed in the third advanced position H3.

Apart from the described set-ups, others are possible using heads in which two needles and/or differently-conformed crochet-bearing groups are present.

In addition to the embodiment described up to this point, a first further embodiment of the base 1 is comprised, not illustrated, in which the bearing structure 10 bears the flange means 11 and the first coupling means 3, while the second coupling means 4 are absent.

In this case, the third and the fourth cogged pulleys 25A, 25B, the second cogged belt 25, the shaft 26 and the second connecting joint 27 are absent. With the first alternative embodiment, the above-described first, second, third and fourth set-ups of the machine M can be obtained.

A second further embodiment of the base 1 is also included, also not illustrated, in which the bearing structure 10 bears the flange means 11 and the second coupling means 4, while the first coupling means 3 are absent. In this case, the first connecting joint 24 is absent from the transmission organs 20.

The second further embodiment enables obtaining the above-described first, fifth, sixth, seventh and eighth set-ups of the machine M.

The foregoing is provided by way of an indicative and non-limiting example, and any eventual modifications to the form or details of the base element, as well as specifications associated thereto, are considered to fall within the scope of protection defined by the following claims.