Closing machine for closing sausage products

1 . A closing machine for closing sausage products, comprising:

a gripper mechanism;

a separator mechanism;

a stapler mechanism, wherein at least the stapler mechanism is configured to be driven independently but in coordination with the gripper mechanism and the separator mechanism during a cycle of the machine when operating the machine in a production mode in which the gripper mechanism, the separator mechanism, and the stapler mechanisms each adopt a first position at a beginning and at an end of said cycle; and

a staple supply mechanism for supplying staples to the stapler mechanism, wherein the staple supply mechanism is configured to be driven independently of the gripper mechanism, the separator mechanism and the stapler mechanisms.

2 . The machine according to claim 1 , wherein:

the stapler mechanism comprises a first jaw that has a press head and a second jaw that has a press die, the first and second jaws being able to be driven in the cycle of the machine operating in the production mode from a position of maximum distance to a position of maximum closeness and back to the position of maximum distance,

wherein in the position of maximum closeness, the stapler mechanism is capable of ensuring closure by crimping at least one staple placed between the press head and the press die,

wherein the staple supply mechanism, is attached to one of the first or second jaw of the stapler mechanism, and wherein the staple supply mechanism has at least one mobile gear element configured to be driven to engage with a corresponding train of staples and to ensure, by entrainment, a step of the train of staples in a feed direction (D) that places a staple of the train of staples between the press head and the press die to be crimped, and

wherein the machine is equipped with a programmable control unit that is programmed to drive the at least one mobile gear element of the staple supply mechanism in one or more of the following ways:

a) following a variable drive speed throughout the cycle of the machine when operating in the production mode,

b) following a drive mode or pattern that differs between that of the production mode and that of a different production mode,

c) entraining a train of staples in a feed direction (D) during a time that elapses between two consecutive cycles of the machine when operating in the production mode, or

d) entraining the train of staples when no operation in the production mode is executed by the machine.

3 . The machine according to claim 2 , wherein the control unit is programmed to drive the mobile gear element according to a), wherein:

the mobile gear element is connected to a crank in an articulated manner and its movement is guided by insertion of a fulcrum into a straight slider, so that in each full turn of the crank in a first direction of rotation, a back-and-forth movement is transmitted to a distal end of the mobile gear element intended to engage with a train of staples, imparting a path with an active section, which upon engaging with the train of staples, the mobile gear element entrains said train of staples, ensuring a step of the train of staples, and a return section, empty and without engaging with the train of staples,

the variable drive speed comprises stopping the crank in an angular locking position such that the distal end of the mobile gear element engages with the train of staples, and which is a final position of a return section and a start position of the active section, and

the angular locking position is a parameter based on the production mode.

4 . The machine according to claim 3 , wherein a value of the angular locking position is configured to be provided to the control unit and associated with the production mode, and in addition or alternatively the control unit includes several programmes that execute different production modes with predetermined values for the angular locking position, with an operator being able to select the programme to be executed.

5 . The machine according to claim 2 , wherein the control unit is programmed to drive the mobile gear element according to b), wherein different production modes are configured to be selected by an operator of the machine and in that each production mode differently orders the mobile gear element to be driven during associated production modes cycles.

6 . The machine according to claim 2 , wherein the control unit is programmed to drive the mobile gear element according to c), wherein the control unit is specifically programmed to continue driving the mobile gear element to ensure completing a step of the train of staples during the time that elapses between two consecutive cycles of the machine when operating in the production mode.

7 . The machine according to claim 2 , wherein the control unit is programmed to drive the mobile gear element according to d), wherein the control unit comprises, when operating in a loading mode (A1), ordering the mobile gear element to be driven to engage with a train of staples and to ensure, by entrainment, completing more than one consecutive step of the train of staples in the feed direction (D) without the first and second jaws of the stapler mechanism adopting the position of maximum closeness in the meantime.

8 . The machine according to claim 2 , wherein the control unit is programmed to drive the mobile gear element according to d), wherein the control unit comprises, when operating in a pairing mode (A3), ordering the mobile gear element to be driven to engage with a train of staples and to ensure, by entrainment, completing more than one consecutive step of the train of staples in a direction (I) opposite to the feed direction (D) without the first and second jaws of the stapler mechanism adopting the position of maximum closeness in the meantime.

9 . The machine according to claim 2 , further comprising at least one first driveline and one second driveline configured to be controlled electronically by the control unit, of which the first driveline is configured to drive the first and the second jaws of the stapler mechanism and the second driveline is configured to drive the mobile gear element of the staple supply mechanism.

10 . The machine according to claim 2 , further comprising a shared driveline to which the stapler mechanism and the staple supply mechanism are coupled by a powerchain to ensure a coordinated drive of the first and second jaws and the mobile gear element; the powerchain including clutch means that allow the stapler mechanism to be mechanically detached from the shared driveline, and breaking the powerchain, leaving the stapler mechanism static and the shared driveline being able to continue driving the mobile gear element of the staple supply mechanism during machine operation in the production mode, loading (A1), unloading (A2) or pairing (A3) modes, where the shared driveline and the clutch means are electronically controlled by the control unit.

11 . A machine according to claim 2 , further comprising a detection means to know whether a train of staples extends through one or more associated detection windows and in that the control unit is programmed to operate the machine in at least a loading mode (A1) or an unloading mode, which comprises ordering the mobile gear element to be driven to engage with a train of staples and to ensure completing more than one consecutive step of the train of staples in the feed direction (D) without the first and second jaws of the stapler mechanism adopting the position of maximum closeness in the meantime, based on a signal generated by the detection means when it is known whether the train of staples extends through a detection window.

12 . The machine according to claim 11 , wherein a detection window is associated with first detection means and covers one of the press head or the press die; and in that the control unit is programmed so that the drive of the mobile gear element is stopped during the operation of the machine in load mode (A1) when it is known that the train of staples extends through the detection window.

13 . The machine according to claim 2 , further comprising a detection means that covers one of the press head or the press die; and in that the control unit is programmed to operate the machine in at least one production mode that comprises stopping the mobile gear element if after driving the mobile gear element to ensure, by entrainment, a step of the train of staples in a feed direction (D) it is known that the train of staples does not extend through the detection window.

14 . The machine according to claim 11 , wherein n is the number of consecutive steps that a train of staples completes in the feed direction (D) during operation in loading mode (A1) given the drive of the mobile gear element, the control unit is programmed to first operate the machine in a pairing mode (A3) that comprises driving the mobile gear element to ensure n consecutive steps of a train of staples in the opposite direction (I).

15 . The machine according to claim 2 , wherein the staple supply mechanism comprises

a guide for the at least one train of staples; and

a cover in the vicinity of the press head or the press die that projects above the mobile gear element, said cover being applied by elastic means towards the gear element so that the cover helps to arrange the train of staples that runs between the cover and the gear element against said gear element; and in that the control unit is programmed to stop the gear element in a position where, due to contact with the cover, the cover is lifted without exerting any thrust on the portion of the train of staples downstream of the gear element in a state of removing staples from the machine when operating in a unloading mode (A2).

16 . The machine according to claim 15 , wherein the detection window associated with second detection means covers a position of the train of staples upstream of the mobile gear element; and in that the control unit is programmed so that

the state of removing staples from the machine when operating in an unloading mode (A2) is automatically adopted when it is known that the train of staples does not extend through the detection window and after driving the supply mechanism to ensure a predetermined number of m steps of the train of staples in the feed direction (D).

17 . A sausage production process that uses a machine according to claim 2 , wherein the programmable control unit is programmed to drive the staple supply mechanism and move the mobile gear element when a cycle of the machine when operating in the production mode is not executed, a process comprising continuing to drive the mobile gear element of the supply mechanism to finish ensuring a step of the train of staples in the feed direction (D) that places a staple of the train of staples between the press head and the press die of the stapler mechanism during a standby time that elapses between the end of one cycle and the beginning of the following cycle of the machine when operating in the production mode, a standby time during which material is stuffed into the casing of the sausage product to be closed in said following cycle of the machine.