The present invention relates to a single-casing tandem press developed for providing two press brakes, positioned side by side for tandem operation, to be in an integrated structure. PRIOR ART

Press brakes are frequently preferred machines for realizing sheet bending process. In cases where the sheet, which is to be subjected to bending process, is big and where the machine width is insufficient, machines are used which are named tandem press and formed by positioning the two presses side by side. The two presses, positioned side by side in accordance with the sheet dimension in tandem presses, can be operated together and besides, the presses can be operated one by one in cases where small sheets are to be bent.

In tandem presses, each press machine is welded separately and subjected to machining process and assembled. For providing tandem operation conditions, mechanical and electronic connection of the two press machines with each other and the installation thereof shall be realized. Moreover, in tandem operating machines, the aligned adjustment of the two press machines in accordance with the bending dimensions of the sheet, which is to be bent, shall be realized in a precise manner. The upper press plates of the press machine are expected to realize the same movement with the same precision and with the same pressure tonnage, and the bending-tensioning-extending amounts for both presses are expected to be the same. All of said processes and requirements double the time and labor requirement and moreover they increase the costs with this proportion. As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a single-casing tandem press which provides bending of wide and narrow sheets under a single machine embodiment, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field. The main object of the present invention is to provide a single-casing tandem press which has a single machining and assembly step.

Another object of the present invention is to provide a single-casing tandem press where the time and labor required for installation are reduced and where the costs in relation are reduced.

Another object of the present invention is to provide a single-casing tandem press which does not need extra adjustment even in long working hours and which provides high precision operation.

In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a tandem press used in sheet bending process and comprising at least two upper press plates provided side by side and ridging groups aligned with respect to said upper press plates. Accordingly, said tandem press is characterized by comprising a main body which joins said upper press plates and said ridging groups in a void-free manner, and at least one upper drive mechanism provided at said main body and connected to each upper press plate in order to move the upper press plates separately or together.

In a preferred embodiment of the present invention, said main body comprises two carrier vertical sections positioned mutually, an upper connection bearing where the upper drive mechanisms are placed and provided between said carrier vertical sections and a lower connection bearing extending in a substantially parallel manner to said upper connection bearing.

In another preferred embodiment of the present invention, said upper drive mechanism comprises an electric motor provided at the upper connection bearing and a belt-pulley group connected to said electric motor.

In another preferred embodiment of the present invention, the upper drive mechanism comprises a screwed shaft group connected to the upper press plate in a manner transferring movement from said belt-pulley group to the upper press plate.

In another preferred embodiment of the present invention, the upper drive mechanism comprises a bearing-cylinder group where the screwed shaft group is bedded. In another preferred embodiment of the present invention, command panels are provided at the two sides of the main body in order to control the upper press plates separately or through a single unit. BRIEF DESCRIPTION OF THE FIGURES

In Figure 1 , the front perspective view of the tandem press is given. In Figure 2, the rear perspective view of the tandem press is given.

REFERENCE NUMBERS

10 Tandem Press

1 1 Main Body

1 1 1 Carrier Vertical Section

1 12 Upper Connection Bearing

1 13 Lower Connection Bearing

12 Upper Press Plate

13 Ridging Group

14 Upper Drive Mechanism

141 Electric Motor

142 Belt-Pulley Group

143 Bearing-Cylinder Group

144 Screwed Shaft Group

15 Lower Drive Mechanism

16 Command panel

DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the subject matter tandem press (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

The tandem press (10), whose front perspective view is given in Figure 1 , basically comprises a main body (1 1 ), two upper press plates (12) provided side by side at said main body (1 1 ), ridging groups (13) aligned under said upper press plates (12), upper drive mechanisms (14) connected with the upper press plates (13), lower drive mechanisms (14) connected with the ridging groups (13) and command panels (16) connected at the two sides of the main body (1 1 ).

The main body (1 1 ) comprises two carrier vertical sections (1 1 1 ) positioned mutually and an upper connection bearing (1 12) in a manner connecting said carrier vertical sections (1 1 1 ) to each other and a lower connection bearing (1 13) which is substantially parallel to said upper connection bearing (1 12). There are four upper drive mechanisms (14) at the upper connection bearing (1 13). The upper press plates (12) are connected to two each upper drive mechanisms (14). The lower drive mechanisms (15) are connected to the ridging group (13). The upper drive mechanism (14) comprises an electric motor (141 ), a belt-pulley group (142) where said electric motor (141 ) transfers drive, a screwed shaft group (144) where said belt- pulley group (142) transfers movement, and a bearing-cylinder group (143) which provides bedding to said screwed shaft group (144). While the electric motor (141 ) and the belt-pulley group (142) are positioned inside the upper connection bearing (1 12), the screwed shaft group (144) is connected to the upper press plate (12). In accordance with the dimension of the tandem press (10), the dimension of the press plates (12) may change and depending on this, the number of upper drive mechanisms (14) can be increased for adjusting and applying the desired press tonnage in a precise manner. By means of the tandem press (10), bending of both the wide sheets and the narrow sheets can be realized. In this direction, in case of operation with wide sheets, both the ridging groups (13) and the upper press plate (12) are also operated on the tandem press (10). While the movement of the upper press plates (12) is provided by means of the upper drive mechanism (14), the movement of the ridging groups (13) is provided by means of the lower drive mechanisms (15). All upper press plate (12) and the ridging groups (13) can be moved with the same precision, and thus, bending process can be provided in the desired bending angle at every point of sheet and with the same press tonnage. At every region of the tandem press (10), the same bending-extending-tensioning values can be obtained. The realized bending process can continue without occurrence of deviation in the machine bending adjustments even at long-duration operation hours. The data and process parameters related to the bending process are entered separately for each press plate through one of said command panels (16), and equal parameter operation is obtained at both parts in case the values are equal to each other. In case of operation with narrow sheets, operation is realized with a single ridging group (13) and with a single upper press plate (12). Data and process parameters are entered through a single command panel (16), and in this direction, the tandem press (10) can be operated in a single-sided manner. Two of the upper drive mechanisms (14) are activated by means of operating the tandem press (10) in a single-sided manner. Thus, by means of this operation systematic realized in a single-sided manner, extra energy consumption is prevented. By means of the subject matter tandem press (10), narrow and wide sheets can be subjected to bending process with high efficiency without extra energy consumption on the same press with two bending parts formed side by side inside a single main body (1 1 ). Moreover, since the tandem press (10) comprises a single machining and assembly step, the required time and labor can also be reduced for the installation, and production and installation costs can be reduced.

The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.