Patent Description:
The invention also relates to a machine for processing fabric comprising said conveyor system, and to a method for moving a fabric.

Machines for the continuous processing of a fabric that improve the tactile characteristics thereof, and in particular surface softness and shrinkage, have been known for some years now. Among the various prior art machines there are known, for example, machines that impact a damp fabric between two impact structures located at the ends of a pneumatic conveying tunnel of the fabric. This impact causes softening, shrinkage and settling of the fabric. Machines of this type are described, for example, in the <CIT>, <CIT>, and in <CIT>.

In the first two applications cited, the fabric is fed between two collection tanks upstream and downstream of the tunnel, in which a fabric bath may or may not be provided. The central area of the tunnel is provided, both on the upper and lower parts, with two air ejection areas, each having an air blower device comprising two channels for conveying air toward the tunnel; the channels extend from a storage tank, which is connected to an air movement system. More in particular, each blower device (lower on the bottom of the tunnel, and upper on the top of the tunnel) has two channels, diverging from the storage tank toward the tunnel, i.e., inclined with respect to the direction of extension of the tunnel and of feed of the fabric. The two pairs, upper and lower, of channels are arranged substantially at the same longitudinal height as the tunnel. In the area in which the two respective channels bifurcate from the storage tank, a deflector is provided, controlled by an actuator that, when actuated, closes one channel keeping the other open, or vice versa.

From the point of view of operation, the fabric inside the tunnel is moved by the push or pull exerted by the air that impacts the fabric in an inclined manner from above and from below, i.e., by the horizontal pushing component of the air on the fabric. The fabric pulled by the air impacts against an impact structure and falls into the tank below. The deflectors of the upper and lower blower device are positioned so that the air is all conveyed in the channels oriented in a direction of the tunnel or all conveyed in the channels oriented in the opposite direction. The motion of the fabric is periodically reversed acting on the deflectors, so that each section of fabric can impact against the impact structures several times. The fabric is overfed to the tunnel. The alternating motion is overlapped by a slow feed movement the fabric so that a section of fabric, after a certain number of impacting cycles, is in any case located outside the tunnel and is ready for any further processing in a new station.

The air for pushing or pulling the fabric is recovered by a suction system that can be provided, for example, with suction areas at the ends of the tunnel (for example in front of the impact structures, which are appropriately perforated), or can (also) be provided with suction holes arranged on the top and/or on the bottom of the tunnel. Besides moving the fabric, the air also dries it.

The flows or jets of air are produced by an air movement system comprising, for example, one or more fans.

Although these machines have proved to operate optimally, they are still susceptible to improvements, for example, linked to flexibility of use and energy saving.

For example, to be able to vary the output pressure of the air from the channels (i.e., in the tunnel), and therefore vary the impact speed of the fabric against the impact structures, the number of revolutions of the fan must be varied. However, this also leads to an increase in air flow rate and electricity consumption, with the relevant costs deriving therefrom.

Moreover, in tunnels provided with a plurality of blower devices, the air passing through the tunnel in one direction tends to enter the channels that are not active (i.e., the channels isolated by the deflectors, hence which the air for pushing the fabric does not pass through), causing hydraulic losses and turbulence in the tunnel, to the detriment of its energy efficiency.

The aim of the present invention is to provide a pneumatic conveyor system for fabric in machines for processing fabric which solves the problems encountered in prior art systems.

In relation to this aim, an important object of the present invention is to produce a pneumatic conveyor system for fabric in machines for processing fabric that allows the pressure and/or the speed of the air for conveying the fabric to be varied.

Another important object of the present invention is to produce a pneumatic conveyor system for fabric in machines for processing fabric with which it is possible to limits losses in air flow and turbulence within this flow.

One more important object of the present invention is to provide a method for conveying a fabric with which it is possible to limit energy losses.

These and other objects, which will be more apparent below, are achieved with a pneumatic conveyor system for preferably damp fabric in machines for processing fabric, comprising a transit tunnel and at least one air blower device provided in the tunnel, comprising at least a first and a second channel, diverging from each other and inclined with respect to the direction of extension of said tunnel, which flow into the tunnel to convey air respectively according to an inclined direction converging in a first direction of feed of the fabric in the tunnel and according to an inclined direction converging in a second direction of feed of the fabric opposite said first direction, in order to produce a movement pushing on the fabric alternately in the two directions of convergence, so that when the first channel is active, i.e., the air passes through the first channel and not through the second channel, the fabric is moved in the first direction of feed, while when the second channel is active, i.e., the air passes through the second channel and not through the first channel (which is not active), the fabric is moved in the second direction of feed. The particularity of the invention lies in the fact that the conveyor system also comprises a variation device of the dimensions of the area of a section of the channels of said blower device, in order to adjust the air pressure delivered from these channels, obtaining a variation of the speed of the fabric in the tunnel.

Preferably, the variation device of the dimensions of the area of a section of the channels of the blower device comprises, for each channel, a closing body of the outlet port of the channel in the tunnel; this closing body is adapted to take a plurality of positions for blocking said outlet port, from an initial position with the outlet port open to a final position with the outlet port partly, or completely, blocked.

Plurality of positions for blocking is meant both as a discrete number of positions, for example predefined, for example obtained by means of a stepped movement between positions of the closing body, and a number of positions that are not predefined, given by a non-discrete movement (i.e., a movement that allows any position along the movement section of the closing body), or being able to implement a continuous movement of the closing body from the initial position to the final position.

Preferably, the closing body is a moving blade or bulkhead provided positioned at an end portion of a wall of the channel, so that the face of the bulkhead facing the inside of the channel defines an end portion of said channel and the free end of the bulkhead defines part of the edge of the outlet port of the channel in the tunnel. Therefore, the movement of the bulkhead from the initial position toward the final position causes a narrowing of the end portion of the tunnel and of the outlet port, i.e., a reduction of the area of the outlet port in the tunnel, or optionally complete closing of the outlet port.

Preferably, the moving bulkhead is hinged at an end portion of a wall of the channel, so that its movement between the initial position and the final position is a rotary movement.

In other embodiments, the bulkhead can, for example, move by translation, or roto-translation.

Advantageously, each said first and second channel is provided with a respective closing body.

Preferably, the system comprising the blower device comprises at least a first said blower device arranged on the upper part of said tunnel, and at least a second said blower device arranged on the lower part of said tunnel; preferably, the outlet ports of respective channels of the two blower devices in the tunnel are provided in a same longitudinal position along the tunnel.

Preferably, the variation device comprises a mechanism for the simultaneous movement of the closing bodies of the first and second channel; preferably there is provided a single movement actuator and movement transmission members connected to this single actuator, adapted to simultaneously move the closing bodies of the first and second channel, i.e., to simultaneously move all the closing bodies present in the tunnel, based on the actuation of said actuator.

This solution is, for example, preferable when in the tunnel there is a single pair of blower devices having two overlapped pairs of first and second channels.

Preferably, the mechanism for simultaneous movement simultaneously moves of all the closing bodies of the correspondingly facing first and second blower device positioned on the upper and lower parts of said tunnel.

According to preferred embodiments, the system is provided with a device for closing the channels when they are not active and more preferably a device for closing the outlet ports in the tunnel when the channels are not active, so as to prevent the air passing through said tunnel from leaking into channels that are not active.

In other embodiments, the pneumatic system comprises a plurality of said blower devices provided on the upper part and a plurality provided on the lower part of the tunnel, to push the fabric in the desired direction both from above and from below, and wherein each closing body of the channels of said blower devices is adapted to take a plurality of blocking positions of the respective outlet port, from an initial position in which said outlet port is not blocked, to a final position with said outlet port completely blocked, or closed, and wherein, during pushing of the fabric by the air passing through said active channels, each variation device positions, in the channels that are not active, the respective closing bodies in said final closed position, so as to prevent the air passing through said tunnel from leaking into the channels that are not active.

Therefore, in this situation, the closing bodies are subjected to a "one-off' movement when it is necessary to adjust the width of the outlet port (and hence the pressure/speed of the air flow delivered from the tunnel), a movement to close the outlet port each time the related channel in which the closing body acts becomes a channel that is not active, and a movement to open the outlet port when the channel become active once again, i.e., the air flow passes through this channel.

Preferably, given a pair of correspondingly facing blower devices in said tunnel, the pneumatic system is provided with a first mechanism for moving, preferably simultaneously, the closing bodies of the first channels of the two upper and lower blower devices, and a second mechanism, independent from the first mechanism, for moving, preferably simultaneously, the closing bodies of the second channels of the two upper and lower blower devices, so as to be able to adjust the air flow delivered from both first or both second channels, and to be able to close the first or the second channels when not active to prevent air from leaking into them (and obviously to open them again when they require to be active); preferably there are provided respective actuation assemblies for said first and said second mechanism.

The term "independent" means that the mechanisms are actuated by different members to one another, so that in order to perform the movement of the closing bodies of two overlapped first channels and of two overlapped second channels of two overlapped blower devices, it is necessary to actuate two distinct mechanisms, one for each pair of overlapped channels. It is clear that the actuation of these mechanisms is coordinated in time to open/close the channels that are not active, at each reversal of the air flow in the tunnel by the electronic control unit of the machine.

For example, each actuation assembly comprises two actuators, for example arranged in series, a first actuator allowing adjustment of the position of the closing bodies to adjust the width of the outlet port (and hence the pressure/speed of the air flow delivered from the tunnel), which is only actuated when this adjustment is required, and a second actuator allowing closing and opening of the outlet port when the channels are not active/active.

According to preferred embodiments, the blower device comprises at least one flow diverter operating in at least two positions, a first position for closing said first channel to convey air into said second channel, and a second position for closing said second channel to convey air into said first channel. More preferably, the first and second channel converge in a duct that conveys the air from the air movement system, and this flow diverter acts in the area of intersection between first channel, second channel and duct.

In other embodiments, the diverter can be arranged in an intermediate, neutral, position, so as to simultaneously convey the same air flow for the two channels, thus creating two opposing pushes on the fabric, which can therefore remain stopped or slow down temporarily.

According to another aspect, the invention relates to a machine for processing a fabric, comprising.

The machine, and the conveyor system of the fabric, are advantageously provided with an electronic control unit of the various components, to allow operation thereof.

Preferably, this machine is a machine for carrying out a softening and shrinking process for a fabric, for example a damp fabric. The machine can also process a dry fabric.

Preferably, the chambers are provided with respective impact structures located upstream and downstream of at least one section of said path and against which the fabric is adapted to impact according to the direction of movement to carry out a softening and shrinking process through impact.

Preferably, the machine carries out a drying process of the fabric by means of the air flows in the tunnel.

According to another aspect, the invention relates to a method for moving a fabric that provides for pulling or pushing the fabric, by means of jets air above and below a fabric being processed, alternately toward opposed chambers into which the fabric is adapted to enter, the directions of said jets of air being inclined with respect to the horizontal so as to create a resulting horizontal pushing or pulling component of the air on the fabric that allows it to be moved, wherein said jets of air enter said tunnel from a plurality of channels with opposed inclinations, characterized in that said inclined channels have respective closing bodies of the outlet ports of the channels in the tunnel, movable with respect to the walls of the channels, said method providing for adjusting the position of said closing bodies in said channels in order to vary the dimensions of the outlet port, thereby adjusting the pressure of the jets of air delivered from said channels.

Preferably, a plurality of said channels are provided with the same inclination, i.e., a plurality inclined in one direction and a plurality inclined in the opposite direction, both on the upper portion of the tunnel and on the lower portion of the tunnel; when the jets of air are fed from the channels inclined in a first direction, i.e., push the fabric in a first direction, the outlet ports of the other channels inclined in the second direction (i.e. the channels that are not active, those through which air does not pass) are closed, and vice versa.

Preferably, this method is obtained with a pneumatic conveyor system according to one or more of the preferred embodiments illustrated above.

The invention will be better understood by following the description and accompanying drawings, which illustrate a non-limiting example of embodiment of the invention. More in particular:.

With reference to the previously cited figures, a schematic diagram of the machine according to the invention is indicated as a whole with <NUM>. Hereinafter it is described only in its fundamental components. The figures show a machine configured to process a fabric (preferably damp or wet, or also a not damp fabric) in width, i.e. laid out according to its cross direction. Likewise, the machine according to the invention can be configured to process a fabric in rope form. The machine essentially comprises a preferably horizontal path <NUM>, at least partly pressurized, along which a fabric T moves, and a two-way pneumatic conveyor system <NUM>, according to the invention, fed by a pneumatic circuit <NUM>, and an optional further pneumatic air suction and recirculation circuit (not shown in the figures). The conveyor system <NUM> is provided with a tunnel <NUM> that defines at least a part of the path of the fabric.

The machine, and the pneumatic conveyor system are managed by an electronic control unit M.

Two impact structures <NUM> and <NUM>, for example in the form of grills, against which the fabric is adapted to impact, are provided upstream and downstream of the tunnel <NUM>, for example in respective chambers, as better explained below.

In the preferred embodiment, the machine according to the invention advantageously comprises at the ends of the path <NUM>, under the impact structures <NUM> and <NUM>, preferably in said chambers, respectively a first processing tank <NUM> and a second processing tank <NUM>, in which an accumulation of fabric being processed alternately forms.

Besides moving the fabric, the air flows of the pneumatic conveyor system <NUM> allow controlled drying of the fabric.

In <FIG> and <FIG>, the pneumatic conveyor system <NUM> directs pressurized air through two blower devices <NUM> and <NUM> located respectively in the upper and lower part of the tunnel, substantially in the same longitudinal position along the tunnel <NUM> in which the fabric is pneumatically conveyed. Each blower device <NUM>-<NUM> has a feed duct 20A-21A or air storage tank that ends with a first and a second channel 20B'-21B' and 20B"-21B", diverging from each other and inclined with respect to the direction of longitudinal extension of said tunnel <NUM>, i.e., the direction of movement of the fabric.

Each channel 20B', 21B', 20B" and 21B" has a respective outlet port <NUM> in the tunnel <NUM>.

In this example, each blower device <NUM>-<NUM> is provided, in a known way, with a flow diverter 20C-21C in the form of a hinged plate, for example positioned in the area in which the duct/air storage tank 20A-21A bifurcates into the two channels 20B'-21B' and 20B"-21B" and which is capable of selectively closing one of the two channels, forcing all of the air flow toward the opposite diverging channel. In this way, the upper and lower blower devices <NUM> and <NUM> convey air, in a manner coordinated with one another, according to inclined directions converging in a first direction of feed of the fabric toward the second impact structure <NUM> and a second position in which the upper and lower blower devices <NUM> and <NUM> convey air in a manner coordinated with one another according to inclined directions converging in a second direction of feed of the fabric opposite the first direction toward the first impact structure <NUM>.

The air flows converging in an inclined direction on the fabric from above and from below coming from the channels 20B'-21B' or 20B"-21B" impact the fabric. These flows are substantially balanced both in terms of flow rate and in terms of incidence and therefore the vertical components of the air push on the fabric cancel one another out, while the horizontal components are added to one another, pushing/pulling the fabric along the path <NUM> toward the outlet port of the tunnel to impact on a corresponding impact structure.

From an operational point of view, the fabric is moved pulled by the air delivered from the first channels (which are thus "active" channels) of the blower devices 20B"-21B" (coming from the compressor/fan <NUM> through the storage tanks 20A, 20B), from a first tank <NUM> toward the second tank <NUM>, impacting on a respective impact structure <NUM>. After a given amount of time, the air flow is conveyed toward the second channels 20B'-21B' (which until this conveying were not active, i.e., without air for pulling the fabric passing through them) of the blower devices <NUM>-<NUM>, which in this way become active channels, thereby reversing the direction of the push and consequently of movement of the fabric, which is pulled from the second tank <NUM> toward the first tank <NUM>, impacting on the opposite structure <NUM>. As a whole, there is in any case a forward movement of the fabric along the path (for example toward the second tank <NUM>) so that all of the fabric can be processed.

Characteristically, the conveyor system <NUM> comprises a variation device <NUM> of the dimensions of the area of a section of the channels of the blower device, in order to adjust the air pressure delivered from these channels, obtaining a variation of the speed of the fabric in the tunnel.

Preferably, the variation device <NUM> of the dimensions of the area of a section of the channels comprises, for each channel, a closing body <NUM> of the respective outlet port <NUM> in the tunnel.

This closing body <NUM> can take a plurality of positions for blocking this outlet port <NUM>, from an initial position with the outlet port open, to a final position with the outlet port partly blocked.

In these examples, each closing body <NUM> is a moving bulkhead or blade (hereinafter indicated with the same number as the closing body, and also with the specific numbers <NUM>, <NUM>, <NUM>, <NUM>, when it is necessary to distinguish them from one another) hinged to an end portion of a wall of the respective channel, so that the face of the bulkhead facing the inside of the channel defines an end portion of said channel and the free end 31A of the bulkhead <NUM> defines part of the edge of the outlet port <NUM> of the channel in the tunnel.

Therefore, moving the bulkhead <NUM> from the initial position toward the final position causes a narrowing of the end portion of the tunnel and of the outlet port <NUM>, i.e., a reduction of the area of the outlet port in the tunnel.

In the case of <FIG>, the conveyor system <NUM> is provided with a single pair of blower devices arranged on the upper part and lower part of the tunnel.

In this case, the variation device <NUM> comprises a mechanism <NUM> for the simultaneous movement of all the bulkheads <NUM> of the channels, which comprises a single movement actuator <NUM> and movement transmission members kinematically connected to this actuator <NUM>, adapted to simultaneously move the bulkheads <NUM>, thus allowing, with a single actuation of the actuator <NUM>, adjustment of the dimensions of all the outlet ports <NUM> of the channels 20B', 20B", 21B', 21B") in the tunnel <NUM>. Advantageously, these variations will be the same for each outlet port <NUM>, it being preferable for the outlet ports all to have the same dimensions.

In this example, the actuator <NUM> is an electric motor that has an output shaft forming a worm screw <NUM>. On this worm screw <NUM> there is arranged is a lead screw that carries jointly therewith a slider <NUM> arranged slidably, and with rotatable coupling, inside a slot <NUM> defined at one end of a first lever body <NUM>. This latter is integral with a first bulkhead <NUM> and therefore is hinged to the tunnel at the same rotation axis as the bulkhead (bulkhead and lever body rotate jointly on the hinge of the bulkhead). A rotation of the worm screw <NUM> causes the lead screw with the slider <NUM> to travel along it, pushing on the slot <NUM>, forcing the lever body <NUM> to rotate around the hinge with axis K, with consequent rotation of the bulkhead <NUM> around the same axis, for example from an initial position in which the area of the outlet port is at its maximum dimensions, to a position close to the opposite part of the channel with respect to the wall where the hinge with axis K is positioned, thereby reducing the section of the respective outlet port <NUM>.

Advantageously, from the lever body <NUM> there extends an appendage, in which there is produced a first guide <NUM> inside which there is slidably and rotatably arranged a cylinder <NUM>, provided at the end with a first rocker arm <NUM>, the opposite end of which is integral with a second bulkhead <NUM> facing the first bulkhead <NUM>, which defines the outlet port of the facing channel.

Therefore, the rotary movement of the lever body <NUM> causes the pushing of guide <NUM> on the cylinder <NUM>, which rotates the first rocker arm <NUM> and therefore the second bulkhead <NUM>, by a rotation angle equal to the rotation angle of the first bulkhead <NUM> (but in the opposite direction).

Moreover, the opposite end of the first lever body <NUM> has a second guide <NUM> for a second cylinder <NUM> rotatably and slidably arranged therein and constrained at the end of a second lever body <NUM>, in turn jointly constrained to the rotation axis of a third bulkhead <NUM>; therefore, this second lever body <NUM> is hinged to the tunnel at the same rotation axis H of the third bulkhead (third bulkhead and second lever body rotate jointly on the hinge with axis H of the third bulkhead).

Therefore, the rotation of the end of the first lever body <NUM> around K also causes a push by the second guide <NUM> on the second cylinder <NUM>, with consequent rotation of the second lever body <NUM> and of the third bulkhead <NUM> by a rotation angle equal to the rotation angle of the first bulkhead <NUM> (but in the opposite direction).

Moreover, the second lever body <NUM> is provided with an appendage with a third guide <NUM> in which there is slidably and rotatably arranged a third cylinder <NUM> constrained at the end of a second rocker arm <NUM>, in turn jointly constrained to the rotation axis of a fourth bulkhead <NUM>; therefore, this second rocker arm <NUM> is hinged to the tunnel at the same rotation axis B of the fourth bulkhead (fourth bulkhead and second rocker arm rotate jointly on the hinge with axis H of the third bulkhead).

Therefore, the rotation of the end of the second lever body <NUM> around H also causes a pushing by the third guide <NUM> on the third cylinder <NUM>, with consequent rotation of the second rocker arm <NUM> and of the fourth bulkhead <NUM> by a rotation angle equal to the rotation angle of the first bulkhead <NUM>.

<FIG> shows the case in which the conveyor system <NUM> is provided with a plurality of blower devices (two in the specific example) <NUM> in the upper part of the tunnel and an equivalent plurality of blower devices <NUM> in the lower part of the tunnel.

In this case, to prevent the air passing through the tunnel from entering channels that are not active, the system is provided with a device for closing the channels when they are not active, described below.

In particular, to close these channels, each closing body <NUM> of the channels 20B', 20B", 21B', 21B" of the blower devices <NUM>-<NUM> is adapted take a plurality of blocking positions of the respective outlet port <NUM>, from an initial position in which the outlet port is not blocked, corresponding to maximum opening of the channels, to a final position with the outlet port <NUM> completely blocked, or closed. This final position is only taken when the channels are not active, i.e., when the fabric is pushed by the air passing through the active channels, which are left open or partly open by the respective closing bodies.

Therefore, in this situation, the closing bodies <NUM> are subjected to a "one-off' movement when it is necessary to adjust the width of the outlet port <NUM> (and hence the pressure/speed of the air flow delivered from the tunnel <NUM>), a movement to close the outlet port <NUM> each time the related channel 20B', 20B", 21B', 21B" in which the closing body <NUM> acts becomes a channel that is not active, and a movement to open the outlet port <NUM> when the channel becomes active again, i.e., the air flow passes through this channel.

More in particular, to carry out both closing and adjustment of the position of the closing bodies <NUM>, the pneumatic system is provided with a first mechanism <NUM> for simultaneously moving the bulkheads <NUM>, <NUM> of the first channels 20B', 21B' of the two upper and lower blower devices <NUM>-<NUM>, and a second mechanism 135A, distinct and independent from the first mechanism <NUM>, but functionally coordinated therewith, for simultaneously moving the bulkheads <NUM>, <NUM> of the second channels 20B", 21B" of the two upper and lower blower devices.

In this way, it is possible to adjust the air flow delivered from both first or both second channels 20B', 21B', 20B", 21B", and to be able to close the first or the second channels when not active to prevent air from leaking into them (and obviously to open them again when they require to be active).

Each first and second mechanism <NUM>, 135A is provided with respective actuation assemblies <NUM>. For example, each actuation assembly comprises two actuators, for example arranged in series, and more in particular a first actuator <NUM>' that allows adjustment of the position of the closing bodies <NUM> to adjust the width of the outlet port <NUM> (and hence the pressure/speed of the air flow delivered from the tunnel), which is only actuated when this adjustment is required, and a second actuator <NUM>" which allows the outlet port <NUM> to be closed or opened when the channels are not active/active.

For example, the first actuator <NUM>' is an electric motor with an output shaft forming a worm screw <NUM>, on which there is rotatably mounted a lead screw <NUM> on which there is hinged the second actuator <NUM>", for example a side shift cylinder. Advantageously, the hinge axis lies on a plane parallel to the plane on which the hinge axes of the bulkheads to the tunnel lie.

At the end of the actuation rod of the side shift cylinder <NUM>" there is hinged a lever body <NUM>. This latter is integral with the closing body <NUM> (bulkhead) and therefore is hinged to the tunnel at the same rotation axis of the bulkhead (bulkhead and lever body rotate jointly on the hinge of the bulkhead). A rotation of the worm screw <NUM> causes the rotation there along of the lead screw <NUM> and the side shift cylinder <NUM>" (not active in this phase, i.e. in practice forms a stem hinged at the ends), forcing the lever body <NUM> to rotate about its hinge axis to the tunnel <NUM>, with consequent rotation about the same axis of the bulkhead, thus adjusting the position of the bulkhead, i.e., adjustment of the area of the outlet port <NUM> of the channel 20B", 21B", 20B', 21B', in the tunnel <NUM>. This adjustment takes place only when it is necessary to adjust the pressure of the air flow in the tunnel.

Differently, actuation of the side shift cylinder <NUM>" allows the lever body <NUM> to rotate from the open position to a position closing the outlet port <NUM> in the tunnel <NUM> (in <FIG>, closing of the first channels 20B', 21B'), and is activated at each reversal of the air flow, i.e., when the respective channel is excluded from the air flow that conveys the fabric and becomes a channel that is not active. In this situation, to prevent the air flow in the tunnel from flowing back through the channel that is not active, the moving bulkhead <NUM> of the channel is closed activating the side shift cylinder <NUM>".

Advantageously, on the part of the tunnel opposite the one with the hinge of the moving bulkhead <NUM> to the tunnel, there is provided a seat for a sealing gasket <NUM> of the end of the bulkhead, when closed.

Advantageously, from the lever body <NUM> there extends an appendage in which there is produced a first guide <NUM>, inside which there is slidably and rotatably arranged a cylinder <NUM> provided at the end with a rocker arm <NUM>, the opposite end of which is integral with a second bulkhead facing the upper bulkhead, which defines the outlet port <NUM> of the facing channel.

Therefore, the rotary movement of the lever body <NUM> causes the guide <NUM> to push on the cylinder <NUM>, which rotates the rocker arm <NUM> and therefore the respective bulkhead, by a rotation angle equal to the rotation angle of the facing bulkhead (but in the opposite direction).

In practice, the method for moving the fabric associated with the conveyor system described allows pulling or pushing of the fabric T, by means of jets of air f above and below the fabric being processed, inside the tunnel alternately toward opposed chambers inside which the fabric is adapted to enter.

The directions of the jets of air are inclined with respect to the horizontal so as to create a resulting horizontal pushing or pulling component of the air on the fabric that allows it to be moved.

The jets of air enter the tunnel from the plurality of inclined channels, which are provided with respective closing bodies of the outlet ports of the channels in the tunnel, movable with respect to the walls of the channels, for example rotatable blades or bulkheads.

It is possible to adjust the position of the closing bodies in the channels in order to vary the dimensions of the outlet port, thereby adjusting the pressure of the jets of air delivered from the channels.

A plurality of channels with the same inclination are provided, i.e., a plurality inclined in one direction and a plurality of channels inclined in the opposite direction, both in the upper portion of the tunnel and in the lower portion of the tunnel.

When the jets of air are fed from the channels inclined in a first direction, i.e., when the jets of air push the fabric in a first direction, the outlet ports of the other channels inclined in the second direction (i.e., the channels that are not active, those through which air does not pass) are closed by closing bodies, and vice versa.

Claim 1:
A pneumatic conveyor system (<NUM>) of damp fabric for fabric processing machines, comprising:
- a transit tunnel (<NUM>),
- at least one air blower device (<NUM>, <NUM>) provided in said tunnel (<NUM>), comprising at least a first and a second channel (20B', 20B", 21B'. 21B"), diverging from each other and inclined with respect to the direction of extension of said tunnel (<NUM>), which flow into said tunnel (<NUM>) to convey air respectively according to an inclined direction converging in a first direction of feed of the fabric in said tunnel and according to an inclined direction converging in a second direction of feed of the fabric opposite said first direction, in order to produce a movement pushing on the fabric alternately in the two directions of convergence, so that when the first channel (20B', 20B") is active, i.e., the air passes through the first channel and not through the second channel, the fabric is moved in said first direction of feed, while when the second channel (21B'. 21B") is active, i.e., the air passes through the second channel and not through the first channel, the fabric is moved in said second direction of feed,
- a variation device (<NUM>) of the dimensions of the area of a section of the channels (20B', 20B", 21B'. 21B") of said at least one blower device (<NUM>, <NUM>), in order to adjust the air pressure delivered from said channels (20B', 20B", 21B'. 21B"), obtaining a variation of the speed of the fabric in the tunnel (<NUM>),
characterized in that
said variation device (<NUM>) of the dimensions of the area of a section of the channels of said blower device comprises a closing body (<NUM>) of the outlet port (<NUM>) of a respective channel (20B', 20B", 21B'. 21B") in said tunnel (<NUM>), adapted to take a plurality of positions for blocking said outlet port (<NUM>), from an initial position with said outlet port (<NUM>) open to a final position with said outlet port (<NUM>) at least partly blocked.