ES2527435B1 - AUTOMATED POSITIONING AND TRANSFERING SYSTEM FOR PNEUMATIC CLAMPS IN PRESSES WITH STAMP TRANSFER - Google Patents

Abstract

Automated positioning and transfer system for pneumatic clamps in presses with stamping transfer. # Each profile (1) system clamp holder comprises a pair of inner channels (4) for the pneumatic circuit of the clamps (2), an inner channel (6) for the set of electrical cables (3) of the clamps (2), a pair of front grooves (7) for removably attaching a set of clamping brackets (8a, 8b) of the clamps (2) and a set of connecting front plates (9a - 9d) of the pneumatic and electrical circuit of the clamps (2), a pair of rear slots (10) for removably attaching a set of rear clamping plates (11a, 11b) of the profile (1) to the mobile bar of the press transfer, and a pair of end caps (12a - 12d) provided to seal the pneumatic circuit tightly, the most extreme cover (12a) being provided with a hole intended for connect all cables (3) arranged in said channel l interior (6) with an external power cable (13).

Description

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DESCRIPTION

POSITIONING AND AUTOMATED TRANSFER SYSTEM FOR PNEUMATIC CLAMPS IN PRESSES WITH STAMP TRANSFER

The present invention relates to an automated positioning and transfer system for pneumatic clamps in presses with stamping transfer.

Background of the invention

At present, the known automated positioning and transfer systems for pneumatic clamps in presses with stamping transfer are of the type comprising a pair of clamp holder profiles substantially parallel to each other, each profile being formed by one or more adjacent profile sections , provided with a plurality of pneumatic clamps distributed over a series of different consecutive stamping dies.

Both clamp-holder profiles are coupled to two bars belonging to the transfer of the press that are capable of performing a movement in the direction of advance of the pieces to be stamped, so that a group of clamps associated with the same die is capable of hold a piece to be stamped, transfer it to the next die, and return to its respective die while stamping to repeat this process with subsequent pieces to be stamped or stamped.

Likewise, this type of system includes the wiring of the pneumatic circuit of the clamps and the electrical wiring of sensors for the presence of the pieces to be punched arranged in the respective clamps.

However, these types of systems have the disadvantage that the wiring of the pneumatic and electrical circuit is arranged along the profile always in a chaotic manner around the clamps, which can cause accidents and failures, also making it difficult to tune up of the system, the necessary modifications and the manipulation of the profiles to their warehouses.

Generally, these types of profiles include longitudinal grooves provided for removably attaching clamp holders. These brackets are

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constituted by means of a base plate attachable in said grooves of the profile by means of fasteners and a welded or clamped tube to said base plate, said tube being attachable to an end tube of the respective clamp by means of suitable joining elements.

However, these types of supports have the disadvantage that the base plate is usually bulky, so it occupies a remarkable space that can affect the location of the clamps, in addition to presenting a considerable weight and cost.

Said joining elements comprise two semi-open rings intended to receive respectively the support tube and the end tube of the clamp, and fastener elements capable of adjusting both rings and thus fixing the pneumatic clamp in a predetermined position.

However, this type of joining elements has the disadvantage that they are usually robust pieces that need a certain volume to house the screw means arranged at both ends of the rings, so they also occupy a remarkable space for the location of the tweezers, besides presenting a considerable weight, manufacturing cost and difficulty of adjustment.

On the other hand, these types of profiles are coupled to the respective mobile bar of the transfer press by means of rear clamping plates that are embedded in a hole previously made in the rear wall of the profile. However, they have the disadvantage that the position of said rear plates is always fixed, so they cannot be removed if necessary.

Description of the invention

The objective of the automated positioning and transfer system for pneumatic clamps in presses with stamping transfer of the present invention, is to solve the drawbacks of the systems known in the art, providing a more efficient, lightweight, lighter weight system, which occupies Less space and easier to manipulate by a user.

The automated positioning and transfer system for pneumatic clamps in presses with stamping transfer, object of the present invention, is of the type that

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it comprises a pair of pincer profiles substantially parallel to each other, each profile being formed by one or more adjacent profile sections, provided with a plurality of pneumatic pliers distributed over a series of different consecutive stamping dies, both of which are clamp holder profiles coupled to two bars belonging to the transfer of the press that are capable of performing a movement in the direction of advance of the pieces to be stamped, so that a group of tweezers associated with the same die is capable of holding a piece to be stamped, transfer it to the next die, and return to its respective die while stamping to repeat this process with the subsequent pieces to be stamped, and also including said system the wiring of the pneumatic circuit of the clamps and the electrical circuit of sensors for the presence of the pieces to be stamped arranged in the respective clamps, and is characterized by the fact that each profile po rta-tweezers includes:

a first pair of longitudinal internal channels provided for the passage of air from the pneumatic circuit of the respective clamps, and preferably a second pair of longitudinal internal channels provided for the passage of air from the pneumatic circuit of a set of rotation units and displacement units of the respective tweezers,

a longitudinal central inner channel provided for the passage of the electrical cable assembly of the respective clamps,

a first pair of front longitudinal grooves, intended to removably attach a set of clamp holders and a set of front plates connecting the pneumatic and electrical circuit of the respective clamps, a second pair of rear longitudinal grooves, provided for removably attaching a set of back plates for securing the profile to the respective mobile bar of the press transfer, and

a pair of end caps arranged at both ends of the profile provided to seal the pneumatic circuit tightly,

the most extreme cover of the profile being provided with an orifice intended to connect all the cables arranged in said inner channel with an outer power cable.

In this way, a clamp holder profile is achieved that provides the following advantages:

- a reduction in weight by presenting an optimized geometry and being preferably made of aluminum, so that an increase in production is achieved, as well as a reduction in the cost of fabrication,

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- an optimal protection of the pipes for the pneumatic and electrical wiring of the clamps, so that accidents and failures are avoided,

- greater system rigidity,

- a greater ease in the adjustment and tuning of the system at the time of placing the clamp at any point of the space and with the desired orientation, so that a reduction of the hours used in said commissioning and in the necessary modifications,

- The design of the proposed elements grants sufficient universality so that they can be reused in other applications.

It should be noted that the use of rotation units and displacement units of the tweezers is optional, so they are likely to be coupled to the profile when the rotation or displacement of the pieces is required during the printing process. In this case, the electrical wiring of said rotation and displacement units is also housed within the central inner channel of the profile.

It is very important that the electric cables are well protected to avoid breakage during manual manipulation from the profile storage to the dies. In the system of the invention the electric cables are arranged by a central inner channel of the profile and are collected at one end, preferably by means of a strip. The main cable goes outwards through one of the extreme sealing caps of the profile.

The internal channels of the pneumatic circuit of the profile of the invention avoid the use of external air inlet and outlet wiring necessary for the actuation and displacements (of rotation or linear) of each clamp, as it happens in the state of the art systems, allowing to integrate into the profile the air inlet and outlet of the respective clamps.

Thanks to the fact that the profile integrates inside the wiring of the pneumatic and electrical circuits of the clamps, a profile with a considerably more simplified and protected design is achieved, compared to the profiles known in the art in which the circuit wiring Pneumatic and electric is done externally with the consequent problems of bulk and tangle of cables, as well as accidents and failures.

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Likewise, the front and rear longitudinal grooves of the profile allow a series of connection plates of the pneumatic and electrical wiring of the clamps to be attached in the desired position and removably, a series of rear plates for securing the profile to the transfer bars. of the press and a series of clamp holders, all in a fast and efficient way, as will be described hereinafter.

Advantageously, the electrical connection between each two profile sections is provided through a hole made in the respective adjacent end caps, so that the end profile section is capable of housing all the cables.

In this way, the electrical connections between sections of profile are simplified and protected by exiting through the ends through the end seals, occupying the minimum outer space.

Therefore, the end caps not only have the function of closing the profile sections to cause the pneumatic circuit to be sealed, but also serve as a support for the electrical connections. The virtue of these extreme covers is the reduction of the outer space since they are integrated in the cross section of the profile. In addition, they contribute to lighten the system due to its lower weight and volume, and have a lower cost.

According to another aspect, the system comprises said set of supports intended for fastening the pneumatic clamps, each support including a base plate removably attachable to the pair of front grooves of the profile and a tube integral with said base plate capable of being coupled to an end tube associated with the respective clamp. In this way, it is possible to place said supports in a simple way at any point of the profile according to the needs.

According to a preferred embodiment, the axis of said support tube is parallel to the surface of its base plate, defining a substantially vertical orientation superior or inferior in the position of use.

According to another preferred embodiment, that the axis of said support tube is perpendicular to the surface of its base plate, defining a substantially horizontal orientation in the position of use.

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These supports allow to obtain, due to their optimized design and geometry, a reduction in weight, greater rigidity, less space occupied, a lower manufacturing cost, as well as a reduction in the number of parts used, compared to the supports known in the state of the technique.

In addition, said supports, preferably made of steel, are hollow inside so that they can be used to channel pipes and cables if desired.

According to another aspect, the system comprises said set of connection front plates removably attachable to the pair of front grooves of the profile, said front plates being provided to receive respectively connection terminals of the wiring of the pneumatic circuit and the electrical circuit of the respective clamp or the respective units of rotation or displacement.

In the same way, it is possible to place said front connection plates in a simple way at any point of the profile according to the needs. Their biggest advantage is that they have a fast and practical connection, both electric and pneumatic, close to the assembly of the clamps.

Preferably, each connecting front plate comprises a pair of holes provided for attachment to the profile by means of screw elements capable of being slid through said longitudinal front grooves of the profile and removably fixed at a predetermined position of said profile.

Advantageously, each connecting front plate comprises a pair of holes provided respectively for the input and output connections of the pneumatic circuit, said pair of holes communicating with the corresponding pair of inner channels of the pneumatic circuit in a predetermined position of the profile, after drilling. transverse of said pair of inner channels through said holes of the front plate.

Also advantageously, at least one front connection plate comprises a hole provided for the connection of the electrical wiring, said hole communicated with the inner channel of the electrical circuit in a predetermined position of the profile, after transverse drilling of said inner channel through said front plate hole.

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Preferably, the end seals cover a pair of holes provided for joining by means of screw elements inserted in two longitudinal holes provided at the ends of the profile section.

According to another aspect, the system comprises said set of clamping rear plates removably attachable to the pair of rear grooves of the profile, said rear plates being provided for securing the profile itself to the respective mobile bar of the press transfer.

In the same way, it is possible to place said back support plates in a simple way at any point of the profile for the correct fastening of said profile to the transfer bar, allowing subsequent adjustments and modifications.

Preferably, each fastening back plate comprises holes provided for attachment to the profile by means of screw elements capable of being slid through said longitudinal rear grooves of the profile and removably fixed in a predetermined position of said profile.

However, if desired, the back plates can also be embedded in the rear wall of the profile, instead of being slidably coupled over the rear grooves of the profile.

Advantageously, each fastening back plate comprises an opening intended to be fitted in a hook or similar element belonging to the respective mobile bar of the press transfer.

According to another aspect, the system also comprises a plurality of connecting elements provided for the simultaneous fastening of the support tube and the end tube associated with the pneumatic clamp, each joining element including two semi-open rings intended to receive said two tubes respectively, and Screw elements can adjust both rings and fix them! the pneumatic clamp in an optimal spatial position depending on the requirements of the piece to be stamped.

Preferably, said screw elements of the connecting element are arranged in a central position between said tubes or on both to ensure a minimum occupied space.

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Also advantageously, a range of different configurations of the joining elements is provided, such as joining elements with rings arranged in parallel adjacently or separated by a predetermined distance from each other, or arranged perpendicularly to each other, and may include at least one of the Rings a joint of type rotation, labeling or sliding, or other similar elements, the joining elements being able to be chosen depending on the orientation of the support tube coupled to the profile and the spatial positioning required for the corresponding clamp.

In this way, the elements of union allow the six degrees of freedom, that is to say three displacements, three turns and their orientation necessary to place the clamp in any point of the space. This is especially useful given the complexity of the piece to be handled within the transfer of the press in a stamping process.

Thanks to these union elements, the following advantages are achieved:

- a weight reduction of up to 56.7%

- a smaller space occupied with a reduction of 15.1%

- a simplified fastening by means of a single screw

- easy access to the clamping screw

- simplification in adjustment and tuning

- recovery of the union elements for other applications.

Brief description of the drawings

In order to facilitate the description of how much has been exposed above, some drawings are attached in which, schematically and only by way of non-limiting example, some practical cases of embodiments of the automated positioning and transfer system for pneumatic clamps are shown. presses with transfer of stamping of the invention, in which:

Figure 1 is a perspective view of the system of the present invention showing a section of clip-holder profile;

Figure 2 is a cross section of a profile known in the state of the art; Figure 3 is a cross section of the profile according to the present invention; Figure 4 is a perspective view of a clamp support for vertical type clamps mounted on a profile, according to the system known in the state of the art;

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Figure 5a to 5c are respectively perspective, elevation and profile views of a clamp support of the vertical type clamps mounted on the profile, according to the system of the present invention;

Figure 6 is a perspective view of a clamp support of horizontal type clamps mounted on a profile, according to the system known in the state of the art; Figures 7a to 7c are respectively perspective, elevation and profile views of a clamp support of the horizontal type clamps mounted on the profile, according to the system of the present invention;

Figure 8 is a perspective view of four embodiments of connecting front plates mounted on the profile, according to the system of the present invention; Figures 9a and 9b are respectively elevational and profile views of a first connection front plate, shown in Figure 8;

Figures 10a and 10b are respectively elevational and profile views of a second connection front plate, shown in Figure 8;

Figures 11a and 11b are respectively elevational and profile views of a third connection front plate, shown in Figure 8;

Figures 12a and 12b are respectively elevational and profile views of a fourth connection front plate, shown in Figure 8;

Figure 13 is a cross section of the profile with a front connection plate showing the internal canalization of the pneumatic circuit for clamps; Figure 14 is a cross section of the profile with a front connection plate showing the internal channeling of the electrical circuit;

Figure 15 is a perspective view of two electrically connected profile sections, according to the system known in the state of the art; Figure 16 is a perspective view of two electrically connected profile sections, showing four embodiments of pneumatic circuit end caps mounted on two ends of both profile sections, according to the system of the present invention;

Figures 17a and 17b are respectively elevational and profile views of a first end cap, shown in Figure 15;

Figures 18a and 18b are respectively elevational and profile views of a second end cap, shown in Figure 15;

Figures 19a and 19b are respectively elevational and profile views of a third end cap, shown in Figure 15;

Figures 20a and 20b are respectively elevational and profile views of a fourth end cap, shown in Figure 15;

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Figure 21 is a perspective view of two embodiments of rear plates mounted on the profile, according to the system of the present invention; Figures 22a and 22b are respectively elevational and profile views of a first rear profile fastening plate, shown in Figure 21;

Figure 23 is a perspective view of a first type of joint element between a support and a clamp, according to the system known in the state of the art;

Figures 24a to 24c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a first embodiment of the system of the present invention;

Figures 25a to 25c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a second embodiment of the system of the present invention;

Figures 26a to 26c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a third embodiment of the system of the present invention;

Figure 27 is a perspective view of a second type of joint element between a support bracket and a clamp, according to the system known in the state of the art;

Figures 28a to 28c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a fourth embodiment of the system of the present invention;

Figures 29a to 29c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a fifth embodiment of the system of the present invention;

Figures 30a to 30c are respectively perspective, elevation and plan views of a joint element between a support bracket and a clamp, according to a sixth embodiment of the system of the present invention;

Figure 31 is a perspective view of a third type of joint element between a support bracket and a clamp, according to the system known in the state of the art;

Figures 32a to 32c are respectively perspective, plan and elevation views of a joint element between a support bracket and a clamp, according to a seventh embodiment of the system of the present invention;

Figure 32d is a cross-section according to line A-A of Figure 32b;

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Figures 33a to 33c are respectively perspective, plan and elevation views between a support bracket and a clamp, according to an eighth embodiment of the system of the present invention;

Figure 33d is a cross section according to line B-B of Figure 33b; Y

Figures 34 to 45a show respectively different arrangements of the

union elements with respect to the support brackets used.

Description of preferred embodiments

The automated positioning and transfer system for pneumatic clamps 2 in presses with stamping transfer, of the present invention, is of the type comprising a pair of profiles 1 clamp holders substantially parallel to each other, each profile 1 being formed by one or more adjacent profile sections, provided with a plurality of pneumatic clamps 2 distributed over a series of different consecutive stamping dies. Both profiles 1 clamp holders are coupled to two bars belonging to the transfer of the press capable of making a movement of move in the direction of advance of the pieces to be stamped, so that a group of clamps 2 associated with the same die is able to hold a piece to be stamped, transfer it to the next die, and return to its respective die while stamping to repeat this process with subsequent pieces to be stamped. The system also includes the wiring 3 of the pneumatic circuit of the clamps 2 and the electrical circuit of sensors for the presence of the pieces to be stamped arranged in the respective clamps 2.

As can be seen in Figures 1 and 3, each clip holder profile comprises:

- a first pair of longitudinal internal channels 4 provided for the passage of air from the pneumatic circuit of the respective clamps 2;

- a second pair of longitudinal internal channels 5 provided for the passage of air from the pneumatic circuit of a set of rotation units and displacement units (not shown) of the respective clamps 2;

- a longitudinal central inner channel 6 provided for the passage of the electric cable assembly 3 of the respective clamps 2;

- a first pair of front longitudinal grooves 7, provided for removably attaching a set of fastening brackets 8a, 8b of the clamps 2 and a set of connecting front plates 9a-9d of the pneumatic and electric circuit of the respective clamps 2 ;

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- a second pair of rear longitudinal grooves 10, provided for removably attaching a set of rear clamping plates 11a, 11b of profile 1 to the respective mobile bar of the press transfer; Y

- a pair of end caps 12a-12d arranged at both ends of the profile 1 provided to seal the pneumatic circuit tightly, the most extreme cover 12a of the profile 1 being provided with a hole intended to connect all the cables 3 arranged in said inner channel 6 with an outer power cable 13.

In figure 2 a profile 1 'known in the state of the art can be seen, which includes longitudinal front grooves 7' for the coupling of clamping brackets 2 and an inner channel 10 'whose rear wall is liable to be punched for the embedding of fastening plates of the own profile 1 'to the respective mobile bar of the press transfer. However, said profile 1 ’does not include internal channels in its front part to integrate the pneumatic and electrical circuits of the clamps 2.

Thanks to the fact that the profile 1 of the invention (see figure 3) integrates in its interior the wiring 3 of the pneumatic and electrical circuits of the clamps 2, a profile 1 is achieved with a considerably more simplified and protected design, in comparison with the 1 'profiles known in the art (see figure 2) in which the wiring of the pneumatic and electrical circuit is done externally with the consequent problems of bundle and tangle of cables, as well as accidents and failures.

Likewise, the front and rear longitudinal grooves 7 of the profile 1 of the invention allow a series of connection plates 9a-9d of the pneumatic and electrical wiring 3 of the clamps 2, a series of plates, to be removed in a desired position. fasteners 10 of the profile 1 to the bars of the transfer of the press and a series of supports 8a, 8b of the clamps 2, in a fast and efficient manner, as will be described hereinafter.

As mentioned, the system of the invention further comprises a set of supports 8a, 8b intended for fastening the pneumatic clamps 2, each support 8a, 8b including a base plate 14a, 14b removably attachable to the pair of grooves front 7 of the profile 1 and a tube 15a, 15b integral with said base plate 14a, 14b capable of being coupled to an end tube 2a, 2b associated with the respective clamp 2.

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According to a first embodiment shown in Figures 5a to 5c, the support bracket 8a has a vertical type configuration, that is to say the axis of said support tube 15a is parallel to the surface of its base plate 14a, defining a substantially vertical orientation higher or lower in the position of use. In this case, the base plate 14a of said vertical type support 8a has a quadrangular shape with an optimized geometry, being provided with four screw elements 16a for its fastening by fitting in front grooves 7 of the profile 1.

According to a second embodiment shown in Figures 7a to 7c, the support bracket 8b has a horizontal type configuration, that is to say the axis of said support tube 15b is perpendicular to the surface of its base plate 14b, defining a substantially horizontal orientation in the position of use. In this case, the base plate 14b of said horizontal type support 8b has a triangular shape with an optimized geometry, being provided with three screw elements 16b for its fastening by fitting in front grooves 7 of the profile 1.

In both cases, the support brackets 8a, 8b are capable of being slid through said front grooves 7 of the profile 1 and removably fixed in a predetermined position of said profile 1.

Said supports 8a, 8b allow to obtain, due to their optimized design and geometry, a reduction in weight, greater rigidity, less occupied space, a lower manufacturing cost, as well! as a reduction in the number of parts used, in comparison with the supports 8a ’, 8b’ (see figures 4 and 6) known in the state of the art. In addition, said supports 8a, 8b, preferably made of steel, are hollow inside so that they can be used to channel pipes and cables if desired.

In Figures 4 and 6, a vertical support bracket 8a ‘and a horizontal support bracket 8b’ of the type known in the state of the art have been shown respectively. It can be seen that the respective motherboards 14a ’, 14b’ of these supports 8a ’, 8b’ are considerably more bulky than those used in the system of the present invention.

As mentioned, the system comprises a set of connecting front plates 9a-9d removably attachable to the pair of front grooves 7 of profile 1,

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As can be seen in Figure 8. For this, each connection front plate 9a-9d comprises a pair of holes provided for joining to the profile 1 by means of screw elements 17 capable of being slid through said front grooves longitudinal 7 of profile 1 and removably fixed in a predetermined position of said profile 1 (see figures 9a-12b). Therefore, the connection front plates 9a-9d can be located in a simple way at any point of the profile 1 according to the needs.

Figure 8 shows four embodiments of connecting front plates 9a-9d mounted on profile 1, provided to receive respectively connection terminals of the wiring of the pneumatic circuit and the electrical circuit of the respective clamp 2 or of the respective units of rotation or displacement. More concretely:

- a first connection plate 9a (see also figures 9a and 9b) is provided for the air inlet connection 18 of the respective pneumatic clamps 2;

- a second connection plate 9b (see also figures 10a and 10b) is provided for the air outlet connection 19 and for the electrical connection 20 of a respective pneumatic clamp 2;

- a third connection plate 9c (see also figures 11a and 11b) is provided for the air inlet connection 18 of the respective rotation or displacement units of the clamps; Y

- A fourth connection plate 9d (see also figures 12a and 12b) is provided for the air outlet connection 19 and for the electrical connection 20 of a respective rotation or displacement unit of the clamps.

In the case of the front plates 9a, 9b associated with the clamps 2, said for holes provided respectively for the input connections 18 and output 19 of the pneumatic circuit, they are communicated with the corresponding pair of inner channels 4 of the pneumatic circuit in a predetermined position of profile 1, after transverse drilling of said pair of inner channels 4 through said holes of the front plate 9a, 9b.

In the case of the front plates 9c, 9d associated with the rotation or displacement units of the clamps 2, said for holes provided respectively for the input connections 18 and output 19 of the pneumatic circuit, they are communicated with the corresponding pair of channels 5 interiors of the pneumatic circuit in one position

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predetermined profile 1, after transverse drilling of said pair of inner channels 5 through said holes of the front plate 9c, 9d.

Figure 13 shows the cross section of the profile 1 with a connection front plate 9b showing the inner channel 4 of the pneumatic circuit.

Some connection front plates 9b, 9d also comprise a hole provided for the connection 20 of the electrical wiring, said hole communicated with the inner channel 6 of the electric circuit in a predetermined position of the profile 1, prior to transverse drilling of said inner channel 6 a through said hole of the front plate 9b, 9d.

Figure 14 shows the cross section of the profile 1 with a connection front plate 9b showing the inner channel 6 of the electric circuit;

Therefore, said front plates 9a-9d have a quick and practical connection, both electric and pneumatic, close to the mounting of the clamps 2.

An embodiment with two sections of profile 1,1a electrically connected to each other is shown in Figure 16, through an orifice made in the respective adjacent end caps 12a-12d, so that the end profile section 1 is susceptible to housing all cables 3. Four embodiments of end caps 12a-12d can be seen mounted on both ends of both sections of profile 1,1a:

- a first end cap 12a (see also figures 17a and 17b) includes the connection 21a of an external power cable 13;

- a second end cap 12b (see also figures 18a and 18b) includes a first electrical connection 21b between sections of profile 1,1a;

- a third end cap 12c (see also figures 19a and 19b) includes a second electrical connection 21c between sections of profile 1,1a; Y

- a fourth end cap 12d (see also figures 20a and 20b), devoid of electrical connection, serves to close the second section section 1a.

The end caps 12a-12d of sealing also comprise a pair of holes provided for joining by means of screw elements 22 insertable in two longitudinal holes 23 (see Figure 3) provided at the ends of the profile section 1,1a.

Therefore, the end caps 12a-12d of the system of the invention not only have the function of closing the sections of profile 1,1a to cause the pneumatic circuit to be sealed, but also serve as a support for the electrical connections 21a-21c. The virtue of said end caps 12a-12d is the reduction of the outer space since they are integrated in the cross section of the profile 1,1a. In addition, they contribute to lighten the system due to its lower weight and volume, and have a lower cost.

In figure 15 two sections of profile 1 ', 1a' have been represented according to the system known in the state of the art. In this case, the end caps 12 'only have the function of closing 10 the profile 1', 1a ', since the electrical connections 21' are made externally by means of connectors housed on the profile 1 ', 1a', with the following increase in volume and weight

As mentioned, the system comprises a set of fastening rear plates 11a, 11b removably attachable to the pair of rear grooves 10 of the profile 1, 15 provided for fastening the profile itself 1 to the respective mobile bar of the transfer from the press.

In figure 21 two embodiments of rear plates 11a, 11b mounted on the profile 1 are shown. Each back plate 11a, 11b comprises an opening 24 intended 20 to be fitted in a hook or similar element belonging to the respective mobile bar of the transfer of the press.

Each fastening back plate 11a, 11b comprises holes provided for joining to profile 1 by means of screw elements 25 capable of being slid through 25 said longitudinal rear slots 10 of profile 1 and removably fixed in a predetermined position of said profile 1. In Figures 22a and 22b a first embodiment of a rear plate 11a can be seen coupled in the rear grooves 10 of the profile 1. Therefore, it is possible to easily position said rear connection plates 11a, 11b in any point of profile 1, allowing adjustments and subsequent modifications.

However, if desired, the back plates 11a, 11b can also be embedded in the rear wall of the profile 1, instead of being slidably coupled over the rear grooves 10 of the profile 1.

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According to another aspect, the system also comprises a plurality of joining elements 25a-25h provided for the simultaneous fastening of the tube 15a, 15b of the support 8a, 8b and of the end tube 2a of the pneumatic clamp 2.

Referring for example to Figure 24a, each connecting element 25a-25h includes two semi-open rings 27 intended to receive respectively the tube 15a, 15b of the support 8a, 8b and the end tube 2a of the pneumatic clamp 2, and elements of Screw it 28 capable of adjusting both rings 27 and fix them! the pneumatic clamp 2 in an optimal spatial position depending on the requirements of the piece to be stamped.

Said screw elements 28 of the union element 25a-25h are arranged in a central position between said tubes 15a, 15b and 2a or both to guarantee a minimum occupied space, in comparison with the joint elements known in the state of the art , as will be explained later.

The system of the invention provides a wide range of different configurations of the union elements 25a-25h. Next, some preferred embodiments are described:

Figures 24a to 24c show a first embodiment of a connecting element 26a between the tube 15b of a clamping support 8b and the end tube 2a of a clamp 2, of the type with two rings 27 arranged in parallel separated from each other a predetermined distance , joined by two central screws 28.

Figures 25a to 25c show a second embodiment of a connecting element 26 b between the tube 15b of a clamping support 8b and the end tube 2a of a clamp 2, of the type with two rings 27 arranged in parallel separated from each other a predetermined distance, joined by two central screws 28, and provided with a ball joint 29 in one of the rings 27. In figure 23 a connecting element 26b 'of the same type known in the state of the art can be seen, whose screw elements 28 'are at both ends of the clamping rings.

Figures 26a to 26c show a third embodiment of a connecting element 26c between the tube 15b of a clamping support 8b and the end tube 2a of a clamp, of the type with two rings 27 arranged in parallel separated from each other a predetermined distance, joined by two central screws 28, and provided with a sliding element 30 in one of the rings 27.

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Figures 28a to 28c show a fourth embodiment of a joint element 26d between the tube 15b of a clamping support 8b and the end tube 2a of a clamp 2, of the type with two rings 27 arranged in parallel adjacent to each other, joined by a single central screw 28. In Fig. 27 a connecting element 26d 'of the same type known in the state of the art can be seen, whose screw elements 28' are located at both ends of the fastening rings.

Figures 29a to 29c show a fifth embodiment of a joint element 26e between the tube 15b of a clamping support 8b and the end tube 2a of a clamp 2, of the type with two rings 27 arranged in parallel adjacent to each other, joined by a single screw 28 housed on both rings 27.

Figures 30a to 30c show a sixth embodiment of a connecting element 26f between the tube 15b of a clamping support 8b and the end tube 2a of a clamp 2, of the type with two rings 27 arranged in parallel adjacent to each other, joined by a single screw 28 housed on both rings 27, and provided with a ball joint 29 in one of the rings 27.

Figures 32a to 32d show a seventh embodiment of a connecting element 26g between the tube 15a of a support bracket 8a and the end tube 2a of a clamp 2, of the type with two rings 27 arranged perpendicularly to each other, joined by a single central screw 28 housed diagonally. Figure 31 shows a union element 26g ’of the same type known in the state of the art, whose screw elements 28’ are located at both ends of the clamping rings.

Figures 33a to 33d show an eighth embodiment of a connecting element 26h between the tube 15a of a support bracket 8a and the end tube 2a of a clamp 2, of the type with two rings 27 arranged perpendicularly to each other, joined by two screws central units 28 arranged perpendicularly to each other.

In this way, the union elements 25a-25h allow the six degrees of freedom, that is to say three displacements, three turns and their orientation necessary to place the clamp at any point of the space. This is especially useful given the complexity of the piece to be handled within the transfer of the press in a stamping process.

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A series of different arrangements of the connecting elements 25a-25h with respect to the support brackets 8a, 8b used are described below by way of example. The arrows illustrated in the respective figures 34 to 45a show the direction of rotation or displacement of said connecting elements 25a-25h. The angle of rotation of the respective markers has also been illustrated.

Figure 34 represents a first arrangement showing a connecting element 26a according to said first embodiment, coupled between a horizontal support bracket 8b and a clamp 2 not shown.

Figure 35 represents a second arrangement showing a connecting element 26b according to said second embodiment coupled between a horizontal support bracket 8b and a clamp 2 not shown.

Figure 36 represents a third arrangement showing a connecting element 26c according to said third embodiment coupled between a horizontal support bracket 8b and a clamp 2 not shown.

Figure 37 represents a fourth arrangement showing a first joint element 26d according to said fourth embodiment, coupled between a horizontal support bracket 8b and an intermediate support tube 2b, and a second joint element 26d according to said fourth embodiment coupled between said intermediate clamp tube 2b and a clamp 2 not shown.

Figure 38 represents a fifth arrangement showing a joining element 26e according to said fifth embodiment coupled between a horizontal support bracket 8b and a clamp 2 not shown. In figure 38a the same arrangement of figure 38 can be seen with said connecting element 26e rotated a quarter turn around the axis of the tube 15b of the support bracket 8b.

Figure 39 represents a sixth arrangement showing a joining element 26f according to said sixth embodiment coupled between a horizontal support bracket 8b and a clamp 2 not shown. In figure 39a the same arrangement of figure 39 can be seen with said connecting element 26f rotated a quarter turn around the axis of the tube 15b of the support bracket 8b.

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Figure 40 represents a seventh arrangement showing a joint element 26g according to the said seventh embodiment coupled between a vertical support bracket 8a and an intermediate tube 2b in turn axially coupled by a label type connection to an end tube 2a of a Clamp 2 not shown.

Figure 41 represents an eighth arrangement showing a joint element 26g according to the said seventh embodiment coupled between a first vertical support bracket 8a and an intermediate tube 2b, and a second joint element 26d according to the fourth embodiment coupled between said tube intermediate clamp 2b and a clamp 2 not shown.

Figure 42 represents a ninth arrangement showing a joint element 26h according to said eighth embodiment coupled between a first vertical support bracket 8a and an intermediate tube 2b, and a second joint element 26b according to the second embodiment coupled between said tube intermediate clamp 2b and a clamp 2 not shown.

Figure 43 represents a tenth arrangement showing a joint element 26h according to said eighth embodiment coupled between a first vertical support bracket 8a and an intermediate tube 2b, and a second joint element 26c according to the third embodiment coupled between said tube intermediate clamp 2b and a clamp 2 not shown.

Figure 44 represents a tenth arrangement showing a joint element 26g according to said seventh embodiment coupled between a first vertical support bracket 8a and an intermediate tube 2b, and a second joint element 26e according to the fifth embodiment coupled between said tube intermediate clamp 2b and a clamp 2 not shown. In figure 44a the same arrangement of figure 44 can be seen with said connecting element 26e rotated a quarter turn around the axis of the intermediate clamping tube 2b.

Figure 45 represents a twelfth arrangement showing a joint element 26h according to said eighth embodiment coupled between a first vertical support 8a and an intermediate tube 2b, and a second joint element 26f according to the sixth embodiment coupled between said tube intermediate clamp 2b and a clamp 2 not shown. In figure 45a the same arrangement of figure 45 can be seen with said connecting element 26h rotated a quarter turn around the axis of the intermediate clamping tube 2b.

Although reference has been made to specific embodiments of the invention, it is apparent to one skilled in the art that the positioning and transfer system

Automated for pneumatic clamps in presses with described transfer of printing, it is susceptible of numerous variations and modifications, and that all the mentioned details can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.

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Claims (16)

5 10 fifteen twenty 25 30 35 1. Automated positioning and transfer system for pneumatic clamps in presses with stamping transfer, comprising a pair of clamp profiles (1) substantially parallel to each other, each profile (1) being formed by one or more sections of profile ( 1,1a) adjacent, provided with a plurality of pneumatic clamps (2) distributed on a series of different consecutive stamping dies, both profiles (1) clamp holders coupled to two bars belonging to the transfer of the press capable of performing they move in the direction of advance of the pieces to be stamped, so that a group of tweezers (2) associated with the same die is able to hold a piece to be stamped, transfer it to the next die, and return to their respective die while stamping to repeat this process with the subsequent pieces to be stamped, and also said system including the wiring (3) of the pneumatic circuit of the clamps (2) and the electrical circuit of sensors for the presence of the pieces to be stamped arranged in the respective clamps (2), characterized by the fact that each profile (1) clamp holder comprises: a first pair of longitudinal interior channels (4) provided for the passage of air from the pneumatic circuit of the respective clamps (2), and preferably a second pair of longitudinal internal channels (5) provided for the passage of air from the pneumatic circuit of a set of rotation units and displacement units of the respective clamps (2), a longitudinal central inner channel (6) provided for the passage of the electric cable assembly (3) of the respective clamps (2), a first pair of front longitudinal grooves (7), intended for removably attaching a set of fastening brackets (8a, 8b) of the clamps (2) and a set of front connection plates (9a-9d) of the pneumatic circuit and electric of the respective clamps (2), a second pair of rear longitudinal grooves (10), provided for removably attaching a set of rear clamping plates (11a, 11b) of the profile (1) to the respective mobile bar of the press transfer, and a pair of end caps (12a-12d) arranged at both ends of the profile (1,1a) provided to seal the pneumatic circuit tightly, the most extreme cover (12a) of the profile (1) being provided with a hole intended for connect all cables (3) arranged in said inner channel (6) with an external power cable (13). 5 10 fifteen twenty 25 30 35 2. System, according to claim 1, wherein the electrical connection between each two profile sections (1,1a) is provided through an orifice made in the respective adjacent end caps (12b, 12c), so that the Extreme profile section (1) is capable of housing all cables (3). 3. System, according to claim 1, comprising said set of supports (8a, 8b) intended for fastening the pneumatic clamps (2), each support (8a, 8b) including a base plate (14a, 14b) attachable from removable way to the pair of front grooves (7) of the profile (1) and a tube (15a, 15b) integral to said base plate (14a, 14b) capable of being coupled to an end tube (2a, 2b) associated with the respective clamp (2). 4. System, according to claim 3, wherein the axis of said support tube (15a) is parallel to the surface of its base plate (14a), defining a substantially vertical orientation superior or inferior in the position of use. 5. System, according to claim 3, wherein the axis of said support tube (15b) is perpendicular to the surface of its base plate (14b), defining a substantially horizontal orientation in the position of use. 6. System, according to claim 1, comprising said set of connecting front plates (9a-9d) removably attachable to the pair of front grooves (7) of the profile (1), said front plates (9a-9d) being provided to receive respectively connection terminals (18,19,20) of the wiring (3) of the pneumatic circuit and the electrical circuit of the respective clamp (2) or of the respective rotation or displacement units. 7. System, according to claim 6, wherein each connecting front plate (9a-9d) comprises a pair of holes provided for attachment to the profile (1) by means of screw elements (17) capable of being slid through of said longitudinal front grooves (7) of the profile (1) and removably fixed in a predetermined position of said profile (1). 8. System, according to claim 6, wherein each connecting front plate (9a-9d) comprises a pair of holes provided respectively for the input (18) and output (19) connections of the pneumatic circuit, said pair being holes communicated with the corresponding pair of inner channels (4,5) of the pneumatic circuit in one position 5 10 fifteen twenty 25 30 35 predetermined profile (1), after transverse drilling of said pair of inner channels (4.6) through said holes of the front plate (9a-9d). 9. System, according to claim 6, wherein at least one front connection plate (9b, 9d) comprises a hole provided for the connection (20) of the electrical wiring, said hole being communicated with the inner channel (6) of the electric circuit in a predetermined position of the profile (1), after transverse drilling of said inner channel (6) through said hole of the front plate (9b, 9d). 10. System, according to claim 1, wherein the end sealing caps (12a-12d) comprise a pair of holes provided for joining by means of screw elements (22) insertable into two longitudinal holes (23) provided in the ends of the profile section (1,1a). 11. System, according to claim 1, comprising said set of fastening rear plates (11a, 11b) removably attachable to the pair of rear slots (10) of the profile (1), said rear plates (11a, 11b) being provided for the attachment of the profile itself (1) to the respective mobile bar of the press transfer. 12. System, according to claim 11, wherein each rear clamping plate (11a, 11b) comprises holes provided for attachment to the profile (1) by means of screw elements (25) capable of being slid through said longitudinal rear slots (10) of the profile (1) and removably fixed in a predetermined position of said profile (1). 13. System, according to claim 11, wherein each rear clamping plate (11a, 11b) comprises an opening (24) intended to be fitted into a hook or similar element belonging to the respective mobile bar of the press transfer . 14. System, according to one of claim 3, which further comprises a plurality of connecting elements (26a-26h) provided for the simultaneous fastening of the tube (15a, 15b) of the support (8a, 8b) and of the end tube (2a , 2b) associated with the pneumatic clamp (2), each joining element (26a-26h) including two semi-open rings (27) destined to receive respectively said two tubes (15a, 15b; 2a, 2b), and screw elements (28) capable of adjusting both rings (27) and fixing ace! the pneumatic clamp (2) in an optimal spatial position depending on the requirements of the piece to be stamped. 15. System, according to claim 14, wherein said screw elements (28) of the joint element (26a-26h) are arranged in a central position between said tubes (15a, 15b; 2a, 2b) or both for guarantee a minimum occupied space. 5 16. System according to claim 14, wherein a range of different configurations of the connecting elements (26a-26h), such as joining elements (26a-26h) with rings (27) arranged in parallel in parallel, is provided adjacent or separated a predetermined distance from each other, or arranged perpendicularly to each other, being able to 10 include at least one of the rings (27) a rotation, labeling (29) or sliding (30) type joint, or other similar elements, the joining elements (26a-26h) being able to be chosen according to the orientation of the tube (15a, 15b) of the support (8a, 8b) coupled to the profile (1) and of the spatial positioning required for the corresponding clamp (2). fifteen