Sewing machine

Abstract

The present invention relates to a weaving machine 100 comprising a base 1 configured to support a fabric, an upper arm 2 facing the base 1 and arranged at a predetermined vertical height relative to the base 1. The loom 100 further comprises an internal chamber comprising an upper portion defined at least in part by the upper arm 2 and a lower portion defined at least in part by the base 1, and a working assembly 200 operating between the base 1 and the upper arm 2, the working assembly being configured to perform processing of the fabric, the working assembly 200 is mounted at least partially within the upper portion and the lower portion. The loom 100 also includes a lubrication assembly for dispersing a lubricating liquid within the lower portion of the internal chamber. More particularly, the lubrication assembly is disposed within the lower portion, and the upper portion is hydrodynamically separated from the lower portion.

Description

Technical Field

[0001] The present invention relates to a loom.

[0002] In particular, the present invention relates to an industrial or domestic loom for processing fabrics.

[0003] For example, the loom subject of the present invention is a machine for processing fabrics by sewing. In other words, the loom allows performing stitching points on a fabric or on multiple fabrics to sew them together.

[0004] In other words, the present invention is part of the field of processing of fabrics or other similar materials, on which at least one processing, such as stitching points, is performed.

[0005] In a second aspect, the present invention relates to a fabric tension control system in a loom.

[0006] In particular, in the second aspect, the present invention relates to a loom having a voltage control system, which includes an electronic actuator managed by a control unit. The loom in which the tension control system is provided is, for example, a "reverse arm" sewing machine. Background Art

[0007] Generally, a loom includes a main body and an upper arm. The main body externally defines a base configured to support the fabric to be processed, and the upper arm faces the base upperly.

[0008] The main body internally includes a cavity to define an internal chamber, which includes an upper portion at least partially defined by the upper arm and a lower portion at least partially defined by the base.

[0009] Generally, a loom includes a working assembly that operates between the base and the upper arm to perform processing on the fabric arranged on the base.

[0010] More specifically, the working assembly is at least partially mounted inside the internal chamber.

[0011] The main body further includes a housing arranged as a connection between the base and the upper arm, and the housing is intended to accommodate a transmission belt, which in turn is intended to move the working assembly.

[0012] In particular, the working assembly includes a fabric conveying assembly arranged at the base, and the fabric conveying assembly is configured to intercept and move the fabric to be processed.

[0013] In an embodiment where the loom is a sewing machine, the working assembly may include a needle arranged at the upper arm and facing the conveying assembly, the needle being movable between a rest configuration and a working configuration, in which the needle is spaced apart from the conveying assembly in the rest configuration and the needle is arranged at the conveying assembly to intercept the fabric being processed, thereby contributing to performing a stitching point on the fabric being processed.

[0014] In an embodiment where the loom is a sewing machine, the working assembly may include a crochet configured to cooperate with the needle to perform a stitching point.

[0015] Generally, the working assembly further includes a moving mechanism configured to actuate the needle and / or the fabric conveying assembly to perform one or more stitching points together with the necessary thread.

[0016] Today, the moving mechanism includes a motorized member arranged outside the body, disadvantageously defining an excessive overall size and generating unwanted vibrations.

[0017] The moving mechanism can be actuated by means of the motorized member in such a way as to define the corresponding actuation of the needle together with the thread and / or the corresponding actuation of the conveying assembly.

[0018] More specifically, the moving mechanism includes a plurality of rotating and / or translating members in contact with each other, such as shafts or levers. Thus, when the moving mechanism is actuated, its rotating and / or translating members are in a relative sliding state.

[0019] To avoid jamming of the machine and to reduce wear of the moving mechanism and thus to reduce the costs associated with the maintenance of the loom, it is known to arrange a lubrication system in an internal chamber.

[0020] To reduce the torque required to actuate the working assembly, it is known to arrange a lubrication system in an internal chamber.

[0021] Today, the lubrication system provides forced lubrication by means of a lubricating liquid (such as oil) in the internal chamber, such that the lubricating liquid is deposited on the rotating and / or translating members in relative sliding, thereby reducing the friction between them.

[0022] The dispersion of the oil in the internal chamber requires the integration of sealing means in the loom to avoid any leakage.

[0023] Disadvantageously, the integration of the sealing means in the loom results in an increase in the production and maintenance costs of the loom.

[0024] In addition, the sealing means may fail and thus leakage may occur.

[0025] Disadvantageously, in the case where the sealing device is positioned on the upper arm, facing the base supporting the fabric to be processed, any leakage will damage the fabric to be processed, resulting in the product being discarded due to contamination of the product by the lubricating liquid. Therefore, these leaks lead to an increase in the production and procurement costs of the raw materials, i.e., the raw materials of the fabric. Object of the Invention

[0026] Therefore, the technical task of the present invention is to propose a loom that overcomes the drawbacks present in the known art.

[0027] In particular, the object of the present invention is to propose a loom that prevents leakage of the lubricating liquid while maintaining effective lubrication.

[0028] The object of the present invention also lies in proposing a loom that allows for savings in terms of the costs of production of the fabric product and procurement of the fabric to be processed.

[0029] The object of the present invention also lies in proposing a loom that allows for savings in terms of its production and maintenance costs.

[0030] In a second aspect, the object of the present invention is to propose a tension control system, particularly for a "reverse arm" loom, which has a reduced overall size in the stitching area, which must be minimized in order to be able to thread the fabric to produce sleeves or socks, etc. Brief Description of the Drawings

[0031] The specified technical task and the specified objects are substantially achieved by a loom comprising the technical features set forth in one or more of the appended claims.

[0032] The dependent claims correspond to possible embodiments of the present invention.

[0033] Other features and advantages of the present invention will become more apparent from an approximate and thus non-limiting description of a preferred but non-exclusive embodiment of the loom.

[0034] The present description will be elaborated below with reference to the drawings, which are provided for illustrative and thus non-limiting purposes, wherein: Figure 1 shows a schematic view of the subject matter of the loom of the present invention; Figure 2 shows the loom mounted on a workbench Figure 1 ; Figure 3 shows a schematic view of the lower part of the internal chamber of the subject matter of the loom of the present invention; Figure 4 shows a partial cross-sectional view of the subject matter of the loom of the present invention; Figures 5 to 10Schematic representations of different components of the loom subject of the present invention are shown; Figure 11 shows Figure 9 a schematic representation of the electronic differential device of Figure 12 Schematically shows the different adjustment speeds of the front claws. Detailed description of a preferred embodiment of the present invention

[0035] The present invention provides a loom 100, as Figure 1 shown.

[0036] The loom 100 includes a base 1 and an upper arm 2. The base 1 defines a resting portion 1a and is configured to support the fabric. The upper arm 2 faces the base 1 and is arranged at a predetermined vertical height relative to the base 1.

[0037] The term "vertical height" refers to the height measured along the normal direction perpendicular to the base 1 starting from the resting portion 1a.

[0038] In other words, the upper arm 2 is spaced apart from the base 1 along an axis perpendicular to the base 1 itself and defines a working space "S" with the base 1.

[0039] As Figure 2 shown, the loom 100 can be mounted on a workbench 1000 such that it is stably held in the raised position.

[0040] Advantageously, the workbench 1000 allows a part of the fabric being processed to be supported after processing.

[0041] Advantageously, the workbench 1000 allows the loom 100 to be held in a position suitable for an operator responsible for interacting with the loom 100.

[0042] The loom 100 includes an internal chamber 4. The internal chamber 4 includes an upper part 4a (schematically represented in Figure 6 ) and a lower part 4b, shown in Figure 3 .

[0043] More specifically, the upper part 4a is at least partially defined by the upper arm 2.

[0044] In other words, the upper arm 2 includes a corresponding internal cavity that defines the upper part 4a of the internal chamber 4.

[0045] The lower part 4b is at least partially defined by the base 1. In other words, the base 1 includes a corresponding internal cavity that defines the lower part 4b of the internal chamber 4.

[0046] Preferably, the upper part 4a and the lower part 4b communicate with each other.

[0047] Referring to the accompanying drawings, loom 100 includes a working assembly 200 that operates between a base 1 and an upper arm 2. In other words, the working assembly 200 operates within a working space "S".

[0048] The working assembly 200 is configured to perform processing of a fabric disposed on the base 1.

[0049] More specifically, the working assembly 200 is at least partially mounted within an upper portion 4a and a lower portion 4b.

[0050] In other words, the working assembly 200 is at least partially mounted within an internal chamber 4, and thus the working assembly 200 is at least partially disposed within cavities of the base 1 and the upper arm 2 respectively.

[0051] Loom 100 further includes a lubrication assembly 300, as Figures 3 - 5 shown.

[0052] The lubrication assembly 300 includes a pumping member 301 (i.e., a device adapted to pressurize a liquid) and a tank 302 configured to contain a lubricating liquid therein. In other words, the pumping member 301 is configured to pressurize the lubricating liquid.

[0053] The pumping member 301 and the tank 302 are in fluid communication with each other so as to disperse the lubricating liquid within the lower portion 4b of the internal chamber 4.

[0054] In other words, the lubrication assembly 300 is configured to perform lubrication of a portion of the working assembly 200 disposed within the internal chamber 4, particularly within the lower portion 4b of the internal chamber 4.

[0055] Thus, the lubrication assembly 300 is configured to disperse the lubricating liquid over a portion of the working assembly 200 disposed within the lower portion 4b of the internal chamber 4 so as to perform its lubrication.

[0056] More specifically, the lubrication assembly 300 is disposed within the lower portion 4b. In other words, the pumping member 301 and the tank 302 are disposed within the lower portion 4b of the internal chamber 4. Preferably, the tank 302 is at least partially defined by the lower portion 4b itself.

[0057] Furthermore, the upper portion 4a and the lower portion 4b are hydrodynamically separated from each other.

[0058] In other words, the lubricating liquid dispersed within the lower portion 4b by the lubrication assembly 300 cannot reach the upper portion 4a.

[0059] Advantageously, the hydrodynamic separation between the upper portion 4a and the lower portion 4b, together with the positioning of the lubrication assembly 300 within the lower portion 4b, prevents the lubricating liquid from leaking from the internal chamber 4 to the base 1 through the upper arm 2 by gravity.

[0060] In other words, the loom 100 prevents the loss of the lubricating liquid that could affect the fabric being processed disposed at the base 1.

[0061] Furthermore, advantageously, since the loom 100 allows preventing the fabric from being contaminated by the lubricating liquid, the above technical features guarantee savings in terms of the production cost of the fabric product and the procurement cost of the fabric to be processed.

[0062] Referring to the lubrication assembly 300 and Figure 4 , the lower part 4b of the internal chamber 4 includes a tank 302 and a side compartment 40 separated by a wall "P".

[0063] Referring to Figure 4 , the lower chamber 4b includes a portion 41 for accommodating the latch needles that are used to move and thus supply the thread to the working assembly 200. Thus, the portion 41 is non-lubricated to prevent damage to the thread and is separated from the rest of the lower chamber 4b by the wall "P". In other words, the wall "P" isolates the portion 41 from the rest of the lower chamber 4b to prevent oil from seeping into the portion 41.

[0064] The pumping member 301 is positioned within the tank 302 and is connected or connectable to the working assembly 200 such that the actuation of the working assembly 200 corresponds to the actuation of the pumping member 301.

[0065] Preferably, the pumping member 301 includes a gear pump.

[0066] More specifically, the lubrication assembly 300 includes a pipe 303 that is hydrodynamically connected to the pumping member 301 and the side compartment 40, while the wall "P" includes a cavity 400 arranged as a connection between the tank 302 and the side compartment 40 and configured to accommodate the pipe 303.

[0067] As Figure 4 shown, for example, the portion 41 is arranged above the cavity 400 (i.e., relative to the pipe 303).

[0068] Referring to Figure 3 and Figure 5 , the lubrication assembly 300 further includes a lubrication plate 304 and a diffuser 305 that face each other and are arranged to close the side compartment 40 at the top.

[0069] More specifically, the diffuser 305 is arranged below the lubrication plate 304, and the open end of the pipe 303 faces the lubrication plate 304 and the diffuser 305 so as to pour the lubricating liquid at the lubrication plate 304 and disperse it into the side compartment 40 by means of the diffuser 305.

[0070] The diffuser 305 includes a plurality of holes, and thus the lubricant diffuses into the lower part 4b by falling into the holes.

[0071] As Figure 4 shown, the cavity 400 includes a first open end facing the tank 302 and a second open end facing the side compartment 40, and a diameter greater than the diameter of the tube 303.

[0072] Specifically, the first end is disposed at a vertical height lower than the vertical height of the second end.

[0073] Thus, the recirculation of oil from the side compartment 40 to the tank 302 occurs by gravity.

[0074] The loom 100 includes at least one support 5 in the upper part 4a of its internal chamber 4, as Figure 6 shown.

[0075] More specifically, the support 5 is connected to the working assembly 200.

[0076] In other words, the support 5 is connected to a part of the working assembly 200 disposed in the upper part 4a of the internal chamber 4 in order to achieve a low-friction connection with the corresponding components of the working assembly 200.

[0077] According to an embodiment of the present invention, before installing the loom 100, the support 5 needs to be slightly initially lubricated with grease or oil.

[0078] Advantageously, the support 5 replaces the lubrication generated by forced lubrication of the lubricating oil in the upper part 4a of the internal chamber 4, preventing possible jamming of the loom 100 and wear of its components.

[0079] Advantageously, the support 5 allows preventing any leakage of the lubricating liquid from the upper part 4a to the fabric being processed supported on the base 1 due to gravity.

[0080] Furthermore, advantageously, the support 5 ensures savings in the production cost of the fabric product and the procurement cost of the fabric to be processed.

[0081] The support 5 avoids the need to integrate a sealing device in the loom 100, at least in the upper part 4a of its internal chamber 4.

[0082] Thus, advantageously, the support 5 also ensures savings in terms of the production and maintenance costs of the loom 100 and avoids the need for expensive and complex machining to implement the loom 100.

[0083] According to another embodiment, the support 5 may mean a device that does not require adding any oil or grease before installing the loom 100.

[0084] For example, the support member 5 comprises a low friction coefficient sliding support member or a rolling support member or can be made in the form of a low friction coefficient sliding support member or a rolling support member.

[0085] In Figure 6 the illustrated embodiment, the support member 5 is made in the form of a rolling support member, in other words, the first support member 5 (refer to Figure 6 itself on the left side) is made in the form of a roller shell, while the second support member 5 (refer to Figure 6 itself on the right side) is made in the form of a ball support member.

[0086] Advantageously, the aforementioned components ensure a high service life and may be initially lubricated after being installed in the loom 100.

[0087] According to another embodiment, the support member 5 is made in the form of a sliding support member and is produced by a powder compaction process, i.e., by a sintering process.

[0088] Preferably, the sintering process is followed by a process of impregnation with a lubricating liquid such that when the loom 100 is in use, due to the friction between the support member 5 itself and other components of the loom 100, the heat dissipated, the lubricating liquid contained in the support member 5 is released.

[0089] Therefore, due to the support member 5, there is no need for the dispersion of the lubricating liquid in the upper part 4a, and when the loom 100 is stationary, the lubricating liquid is reabsorbed through the pores of the support member 5.

[0090] Even more preferably, the support member 5 is made of sintered bronze, which is advantageously a material suitable for application in the loom 100, i.e., suitable for applications with high speed and low load, and suitable for allowing hydrodynamic lubrication during intermittent (i.e., oscillating) rotational motion.

[0091] According to one embodiment, the support member 5 is made of an aviation-derived polymer material, advantageously capable of withstanding high-frequency stress.

[0092] Refer to Figure 6 , the working assembly 200 includes an upper shaft 201, and the upper shaft 201 extends along a respective development axis "X" that is substantially parallel to the base 1.

[0093] More specifically, the upper shaft 201 is arranged in the upper part 4a, and the support member 5 is arranged around the upper shaft 201.

[0094] Preferably, the upper shaft 201 is adapted to rotate about the development axis "X", in other words, the upper shaft 201 is adapted to rotate within the support member 5.

[0095] Advantageously, the support 5 is in contact with the upper shaft 201 and allows lubrication without dispersion of the lubricating liquid during the rotation and / or translational movement of the upper shaft 201 itself.

[0096] Preferably, the upper shaft 201 includes a corresponding integral section "A". In other words, the upper shaft 201 does not include any channels or holes therein, advantageously ensuring a reduction in the cost of producing the upper shaft 201 itself and thus in the cost of producing the loom 100.

[0097] In order to allow the assembly between the support 5 and the upper shaft 201 during the installation step of the loom 100, the upper shaft 201 is composite, i.e., composed of a plurality of sections 201a, 201b, as Figure 6 shown.

[0098] More specifically, the upper shaft 201 includes a pair of side sections 201a and a central section 201b. The pair of side sections 201a are coaxial with each other, i.e., extend along the axis "X", and include receiving seats "C" at their respective facing ends. The central section 201b is inserted or insertable into the receiving seats "C" of each side section 201a.

[0099] Preferably, the central section 201b and the side sections 201a are made by forging in a specific die.

[0100] Advantageously, the upper shaft 201 thus formed ensures a reduction in the cost of producing the loom 100.

[0101] Preferably, the central section 201b includes a corresponding pair of side portions, each side portion facing the side section 201a, and the pair of side portions are arranged eccentrically with respect to the axis "X".

[0102] The term "eccentric position" means that the center or central part of the receiving seat "C" is not located along the unfolding axis "X", i.e., it does not coincide with the center of the section of the side section 201a.

[0103] Preferably, the central section 201b is inserted into the receiving seat "C" of each side section 201a by cold pressing. In other words, the central section 201b is installed together with the side section 201a to form the upper shaft 201 by interference fit, ensuring a reduced overall size during the implementation of the cold pressing.

[0104] Referring to the accompanying drawings, and in particular Figure 9 and Figure 10 , the working assembly 200 may include at least one needle 202, which faces the base 1 and is movable along the vertical direction "X1" towards and away from the base 1 itself.

[0105] In other words, the needle 202 is movable along a direction perpendicular to the base 1.

[0106] Thus, the needle 202 can move between a rest configuration and a working configuration, in which the needle 202 is spaced apart from the base 1 and in which the needle 202 is arranged on the base 1 to intercept the fabric to be processed arranged on the base 1, thus contributing to performing the stitching points on the fabric to be processed.

[0107] The movement of the needle 202 is imparted by the movement of the upper shaft 201: with reference Figure 6 , the working assembly 200 actually includes a connecting rod "B1" connected to the upper shaft 201 and configured to perform the corresponding movement of the needle 202.

[0108] With reference Figure 7 , the working assembly 200 also includes a lever 203 interposed between the upper shaft 201 and the needle 202, which lever 203 is configured to move the needle 202 along the vertical direction "X1" between the rest configuration and the working configuration according to the rotation of the upper shaft 201.

[0109] The lever 203 is connected to the support 5.

[0110] Advantageously, the support 5 ensures lubrication without dispersing the lubricating liquid in the part of the loom 100 close to the needle 202, thus preventing any leakage at the needle 202 itself.

[0111] Thus, the support 5 avoids the possible leakage of the lubricating liquid from the upper part 4a, ensuring a reduction in the production and procurement costs of the fabric.

[0112] With reference Figure 7 , preferably, the lever 203 includes a pair of side plates 203a, 203b facing each other, and the side plates 203a, 203b are connected or connectable by a pin 203c interposed between the side plates 203a, 203b themselves.

[0113] Advantageously, the lever 203 consists of several parts (i.e., the plates 203a, 203b and the pin 203c), ensuring a reduction in the cost of producing the lever 203 and thus in the cost of producing the loom 100.

[0114] Even more preferably, each of the side plates 203a, 203b includes a receiving seat 203d for the support 5.

[0115] Advantageously, the receiving seat 203d ensures the correct positioning of the support 5 during the installation step of the loom 100 and ensures that the support 5 remains in the seat during the actuation step of the loom 100.

[0116] Similar to the upper shaft 201 above, and with reference Figure 8, the loom 100 includes a lower shaft 204 that unfolds along a respective unfolding axis "Y" that is substantially parallel to the base 1.

[0117] The lower shaft 204 is mounted within the lower portion 4b of the internal chamber 4 (as Figure 3 and Figure 4 visible), and is lubricated by a lubrication assembly 300 (i.e., by the dispersion of lubricating liquid).

[0118] More specifically, similar to the upper shaft 201, the lower shaft 204 is composite, i.e., it includes a pair of side sections 204a and a central section 204b. The pair of side sections 204a are coaxial with each other and include receiving seats "D" preferably arranged in an eccentric position at their respective facing ends. The central section 204b is inserted or insertable into the receiving seats "D" of each side section 204a.

[0119] Preferably, the central section 204b includes its spherical portion, which is connected to a respective connecting rod "B2" in such a way as to enable the movement of the connecting rod "B2".

[0120] The connecting rod "B2" is used to move the hook needles of the loom 100 and thus cooperate with the needles 202 to perform stitching points on the fabric being processed.

[0121] As Figure 4 schematically depicted, at least a part of the lower shaft 204 is at least partially inserted into the part 41 of the lower chamber 4b. In other words, at least one of the pair of side sections 204a and at least a part of the central section 204b are contained within the part 41.

[0122] Preferably, similar to the upper shaft 201, the central section 204b and the side sections 204a are manufactured by forging in a specific die, advantageously ensuring a reduction in production costs.

[0123] Preferably, similar to the upper shaft 201, the central section 204b is inserted into the receiving seat "D" of each side section 204a by cold pressing.

[0124] Advantageously, the composite lower shaft 204 ensures a reduction in the cost of producing the composite lower shaft 204 and thus a reduction in the cost of producing the loom 100.

[0125] According to one aspect of the present invention, and as Figure 5 shown, the lower shaft 204 is connected to a pumping member 301 by at least a pair of gears 7 made of reinforced technical polymer, such that the actuation of the working assembly 200 corresponds to the actuation of the pumping member 301.

[0126] More specifically, the pair of gears 7 preferably includes straight teeth and is actuated by the rotation of the lower shaft 204.

[0127] Advantageously, the enhanced technical polymer ensures a reduction in the cost of manufacturing the loom 100 and gives it greater noise - lessness.

[0128] According to one aspect of the present invention and with reference to Figures 1 - 5 , the loom 100 includes a servo - motor 6, which is preferably of the direct - drive type.

[0129] Advantageously, the servo - motor 6 is compact, thus ensuring a reduction in the overall dimensions of the loom 100.

[0130] Even more advantageously, the direct - drive type servo - motor is economical, ensuring a reduction in the cost of manufacturing the loom 100, and efficient, since its power is transmitted with low losses, ensuring lower energy consumption and thus reducing the cost of actuating the loom 100.

[0131] The servo - motor 6 is at least partially arranged inside the internal chamber 4 and is connected or connectable to the working assembly 200 to actuate the working assembly 200.

[0132] More specifically, the loom 100 further includes a housing 3, which is arranged between the base 1 and the upper arm 2 and is intended to at least partially house the servo - motor 6. In addition, the housing 3 is adapted to house a transmission belt, which is arranged as a connection between the servo - motor 6 and the upper shaft 201 and the lower shaft 206.

[0133] Preferably, the housing 3 is arranged in the corresponding side - portions of the base 1 and the upper arm 2 that face each other.

[0134] Advantageously, the servo - motor 6 generates low vibration and low noise, contributing to reducing the fatigue of the operator interacting with the loom 100.

[0135] According to one aspect of the present invention and with reference to Figure 9 and Figure 10 , the working assembly 200 includes a conveying assembly 206 that is at least partially arranged on the base 1.

[0136] More specifically, the movement of the conveying assembly 206 corresponds to the movement of the fabric arranged on the base 1 relative to the base 1 itself.

[0137] The conveying assembly 206 includes a pair of movable claws 206a, 206b. More specifically, the conveying assembly 206 includes a front claw 206a and a rear claw 206b, the front claw 206a being configured to supply the fabric and the rear claw 206b being configured to convey the supplied fabric and define the distance between two consecutive points.

[0138] The conveying assembly 206 further includes an electronic differential "M", which is configured to increase or decrease the amount of fabric supplied by means of the front claw 206a.

[0139] The electronic differential “M” includes a movable slider 207 connected to the front pawl 206a such that the movement of the slider 207 corresponds to the respective conveying speed of the fabric of the pawl 206a.

[0140] Preferably, the slider 207 is connected to the front pawl 206a.

[0141] More specifically, the electronic differential “M” includes an electric stepper motor 208 and a shaft, which are connected to each other by a pair of gears such that the actuation of the electric stepper motor 208 corresponds to the rotation of the pair of gears and thus to the rotation of the shaft.

[0142] The electronic differential “M” further includes a lever 210 inserted between the shaft and the slider 207, so that when the lever 210 is actuated by the rotation of the shaft, the lever 210 effects the movement of the slider 207.

[0143] More specifically, the stroke of the elliptical movement of the front pawl 206a can be increased and decreased, thereby increasing or decreasing the conveying speed of the fabric.

[0144] The elliptical movement is shown by Figure 10 arrow “F” in

[0145] Preferably, the conveying assembly 206 includes a limit switch sensor configured to generate a signal representative of the working area (i.e., the area in which the fabric is arranged).

[0146] According to one aspect of the invention, the stepper motor 208 is managed electronically and thus the electronic differential “M” and the conveying assembly 206 are managed electronically.

[0147] Advantageously, a working configuration can thus be set during the processing of the fabric.

[0148] Referring to the accompanying drawings, preferably, the loom 100 includes a control unit 8 operatively connected to the working assembly 200 to drive its actuation.

[0149] Thus, the conveying speed of the fabric of the front pawl 206a can be changed according to a law that can be configured and implemented by means of the control unit 8, thereby controlling the speed change even during the sewing operation.

[0150] Advantageously, the conveying speed of the fabric can thus be changed during the processing of the fabric, so as to perform different seams in the same working cycle.

[0151] Preferably, the loom 100 includes a user interface 9 configured to allow an operator to input operation parameters of the loom 100.

[0152] Even more preferably, the user interface 9 includes a touch screen display 9a.

[0153] Advantageously, the loom 100 is able to overcome the drawbacks that occur in the prior art.

[0154] Advantageously, the loom 100 allows preventing liquid leakage onto the fabric being processed.

[0155] Advantageously, the loom 100 thus ensures limiting the costs of production and procurement of raw materials (i.e., the fabric).

[0156] Advantageously, the loom 100 guarantees low production and maintenance costs as well as low costs associated with its energy consumption.

[0157] Advantageously, the loom 100 is noiseless during use and undergoes low vibrations, thus promoting the health of the operator who is intended to use it.

[0158] In a second aspect, the present invention relates to a system (electronic differential) for transporting and controlling the fabric tension in a loom.

[0159] Reference Figure 9 and Figure 10 , as described above, the working assembly 200 includes a conveying assembly 206 that is at least partially disposed on the base 1, wherein the movement of the conveying assembly 206 corresponds to the movement of the fabric relative to the base 1.

[0160] Preferably, the conveying assembly 206 includes a pair of movable claws 206a, 206b, a movable slider 207, and the movable slider 207 is connected to at least one of the pair of claws 206a, 206b, wherein the movement of the slider 207 corresponds to the respective strokes of the claws 206a, 206b during their movement.

[0161] The transmission shaft 220, the crank arm element 221, the slider 22, the joint 223 for differential sliding, and the sliding crank arm of the point 224 are part of the working assembly 206.

[0162] A fabric conveying system with differential claws generally includes separate conveying mechanisms for each of the two claws, namely the front claw 206a (differential claw) and the rear claw 206b (the claw at this point).

[0163] The two conveying mechanisms are controlled by a common drive shaft. This system is more used to solve some sewing defects, especially when using light or elastic fabrics.

[0164] Currently, this type of mechanism is manually controlled by an adjustable positioning lever before sewing. By acting on this lever, the speed of movement of the front claw is adjusted, while the rear claw will always perform the same rotation. This adjustment remains fixed during the sewing operation.

[0165] The present invention allows the electronic management of a conveying and tensioning system. In this way, it is possible to vary the speed of the front pawl 206a using a configurable law managed by a control unit. The advantage is that the system can even be used during the sewing operation.

[0166] One of the main innovations of the present invention is the implementation of a fabric tensioning device.

[0167] A fabric conveying system with differential pawls includes a separate conveying mechanism for each of the two pawls, namely a front pawl (differential pawl) and a rear pawl (pawl at this point).

[0168] The two mechanisms are controlled by a common drive shaft.

[0169] This system is more used to solve some sewing defects, especially when using light or elastic fabrics. Currently, this type of mechanism is manually controlled before sewing by an adjustable positioning lever. By acting on this lever, the speed at which the front pawl moves is adjusted, while the rear pawl will always make the same rotation. This adjustment remains fixed during the sewing operation.

[0170] The present invention allows the electronic management of the fabric tensioning system: in this way, it is possible to vary the speed of the front pawl using a configurable law managed by a control unit.

[0171] The advantage is that the system can even be used during the sewing operation.

[0172] The tensioning device consists of an electric stepper motor 208, to which a pair of toothed wheels is connected, forming a gear 216 (or reducer) that transmits the movement to a first shaft 217. The shaft 217 moves a lever 218, which during the operation of the loom displaces a slider 222 and thus displaces a differential slider 226.

[0173] In this way, the rotational speed of the pawl 206a of the differential will increase or decrease.

[0174] Preferably, the fabric tensioning device includes a limit switch sensor 215, which is configured to monitor the working area via a reader ( Figure 11 )

[0175] The conveying and tensioning device consists of an electric stepper motor 208, where the electric stepper motor 208 is connected to a reducer consisting of gears, preferably two toothed wheels, which transmits the movement to the shaft 217.

[0176] The shaft 217 moves a lever 219, which will displace the slider 222 and thus will displace the differential slider 226. Thereby, it is possible to increase or decrease the rotational speed of the pawl of the differential 206a.

[0177] In the conveying and tensioning device, there is also a safety / limit switch sensor 215, which monitors the working area through a reader 215a.

[0178] Depending on the type of fabric, different rotational speeds of the front pawl 206a can be determined.

[0179] Figure 12 Various rotational speeds of the front pawl 206a relative to the rear pawl 206b are shown by way of non-limiting examples.

[0180] For example, by selecting setting parameter 2, the front pawl 206a will rotate at twice the speed of the rear pawl 206b, thereby displacing much more fabric compared to the rear pawl 206b. Conversely, when the parameter is set to the value 0.7, the front pawl 206a will displace a smaller amount of fabric compared to the rear pawl 206b. In this case, the rear pawl 206b will stretch the fabric while it is being sewn. By selecting the parameter or value 1, the two pawls 206a, 206b will move at the same speed.

[0181] In this way, with the electronic tensioning system, the settings can be changed even during the sewing operation, so that it is determined that the parameter can be changed after an exact number of sewing points.

[0182] Preferably, the loom 100 according to one or more of the foregoing claims includes a control unit 8 operatively connected to the working assembly 200 to drive its actuation.

Claims

1. A loom (100), comprising: a base (1) configured to support a fabric; an upper arm (2) facing the base (1) and arranged at a predetermined vertical height relative to the base (1); an internal chamber (4) including an upper portion (4a) at least partially defined by the upper arm (2) and a lower portion (4b) at least partially defined by the base (1); a working assembly (200) operating between the base (1) and the upper arm (2), the working assembly (200) being configured to perform fabric processing and at least partially mounted within the upper portion (4a) and the lower portion (4b); a lubrication assembly (300) including a pumping member (301) and a tank (302) configured to contain a lubricating liquid, the pumping member (301) and the tank (302) being in fluid communication with each other so as to disperse the lubricating liquid within the lower portion (4b) of the internal chamber (4), characterized in that the lubrication assembly (300) is arranged within the lower portion (4b), and the upper portion (4a) is hydrodynamically separated from the lower portion (4b).

2. The loom (100) according to claim 1, wherein the loom (100) includes at least one support (5) within the upper portion (4a) connected to the working assembly (200).

3. The loom (100) according to claim 1 or 2, wherein, the working assembly (200) includes an upper shaft (201) extending along a respective deployment axis (X) substantially parallel to the base (1), arranged within the upper portion (4a), and wherein, the loom (100) includes at least one support (5) arranged around the upper shaft (201), the upper shaft (201) being adapted to rotate around the deployment axis (X) and / or being adapted to slide along the deployment axis (X).

4. The loom (100) according to claim 3, wherein, The working assembly (200) includes: a needle (202) facing the base (1) and capable of moving towards and away from the base (1) along a vertical direction (X1); a lever (203) interposed between the upper shaft (201) and the needle (202), the lever being configured to move the needle (202) along the vertical direction (X1) according to the rotation of the upper shaft (201), and wherein the support (5) is interposed between the lever (203) and the upper shaft (201).

5. The loom (100) according to claim 4, wherein, The lever (203) includes a pair of side plates (203a, 203b) facing each other and connected or connectable by a pin (203c) interposed between the side plates (203a, 203b) themselves, each of the side plates (203a, 203b) including a receiving seat (203d) for a respective support (5).

6. The loom (100) according to one or more of claims 3 to 5, wherein, The upper shaft (201) includes: A pair of side sections (201a), the pair of side sections (201a) being coaxial with each other and including receiving seats (C) at their respective ends facing each other; A central section (201b), the central section (201b) being inserted or capable of being inserted into the receiving seats (C) of each of the pair of side sections (201a) of the pair of side sections (201a).

7. The loom (100) according to one or more of the preceding claims, wherein, The working assembly (200) includes a lower shaft (204), the lower shaft (204) extending along a respective deployment axis (Y) substantially parallel to the base (1), the lower shaft (204) being arranged within the lower portion (4b), the lower shaft (204) including a pair of side sections (204a) and a central section (204b), the pair of side sections (204a) being coaxial with each other and including receiving seats (D) in their respective ends facing each other, the central section (204b) being inserted or capable of being inserted within the receiving seats (D) of each of the pair of side sections (204a) of the pair of side sections (204a).

8. The loom (100) according to one or more of claims 2-7, wherein, The support (5) includes a low friction coefficient sliding support or a rolling support.

9. The loom (100) according to one or more of the preceding claims, including a servo motor (6), the servo motor (6) being at least partially arranged within the internal chamber (4) and being connected or capable of being connected to the working assembly (200) to actuate the working assembly (200) itself.

10. A loom (100) according to one or more of the preceding claims, wherein, The tank (302) for the lubricating liquid is at least partially defined by the lower portion (4b), and wherein the pumping member (301) is connected or capable of being connected to the working assembly (200) by at least a pair of gears (7) made of an enhanced technical polymer such that the actuation of the working assembly (200) corresponds to the actuation of the pumping member (301).

11. A loom (100) according to one or more of the preceding claims, wherein, The working assembly (200) includes a conveying assembly (206) at least partially arranged on the base (1), wherein the movement of the conveying assembly (206) corresponds to the movement of the fabric relative to the base (1).

12. The loom (100) according to claim 11, wherein, The conveying assembly (206) includes: A pair of movable claws (206a, 206b); A movable slider (207) connected to at least one of the pair of claws (206a, 206b), wherein the movement of the slider (207) corresponds to the respective stroke of the claws (206a, 206b) during their movement.

13. The loom (100) according to one or more of the preceding claims, further including a control unit (8) operatively connected to the working assembly (200) to drive its actuation.

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