Presses – Plural presses
Reexamination Certificate
1999-01-07
2001-05-29
Vo, Peter (Department: 3721)
Presses
Plural presses
Reexamination Certificate
active
06237482
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a transfer press having an improved rigidity in a horizontal direction thereof.
BACKGROUND ART
A conventional transfer press is provided with a press body into which a plurality of working stations are arranged, in which workpieces are subsequently transferred from an upstream side of the working stations towards a downstream side thereof during which the workpieces are worked at the respective working stations.
Japanese Patent Laid-open (KOKAI) Publication No. HEI 8-52597 discloses a transfer press in which a bed, a crown, a slide and the like, which constitute a press body, are divided into sections for the respective working stations, and these divided ones are fabricated into a module as one set of press unit for each of the working stations.
The conventional transfer press of the structure, for example, mentioned in the above publication is assembled at an installation site after preliminarily manufacturing the respective bed sections, crown sections and slide sections in the divided states in a manufacturing factory and conveying them to the installation site, so that it is advantageous that these divided sections can be conveyed with no specific limit in the conveyance even if a large-sized transfer press is installed.
However, in the conventional transfer press disclosed in the above publication, since it is fabricated into a module in each of the working stations, it is necessary to provide uprights for supporting the crown section in each of the working stations. For this reason, when a width of the upright is made large for ensuring the strength thereof, it is obliged to make large a pitch between adjacent two working stations because of the following reason.
That is, the conventional transfer press is provided with a moving bolster, capable of being freely inserted into or drawn out of the press body, for easy exchanging of a mold, and in the transfer press which is fabricated into a module in each of the working stations, such moving bolsters are provided for the respective working stations. Such moving bolsters are passed through a space between adjacent uprights when the moving bolsters are inserted into or drawn out of the press body.
Because of the reason mentioned above, it is necessary to keep the space between the respective uprights sufficient for the moving bolsters to be inserted or drawn out, and accordingly, if the uprights each having a large width are used, the pitch between the adjacent working stations provided with the moving bolsters is inevitably made large. However, in the case where the pitches between the respective working stations are made large, all processes in the working stations are also elongated and the entire length of the press body will be also made large, resulting in a provision of a large-sized press body which requires much manufacturing cost, thus being inconvenient and disadvantageous.
In order to obviate such defect, in the conventional transfer press, which is fabricated into a module at the respective working stations, it is attempted to reduce the pitch between the adjacent working stations and, hence, to make short the entire length of the press body.
In the conventional transfer press, however, if the width of the upright is made small, the rigidity of the press body in the horizontal direction is accordingly reduced, which may cause a swing in the horizontal direction during the working and it is difficult to expect a precise press molding of the transfer press.
The present invention was conceived to solve or improve the problems or defects of the conventional transfer press mentioned above and to provide a transfer press capable of improving the rigidity in the horizontal direction thereof and performing a press molding with a high precision.
DISCLOSURE OF THE INVENTION
To achieve the above object, according to one embodiment of the present invention, there is provided a transfer press, in which a bed, a crown and a slide are divided into sections for respective working stations and the respective divided sections are fabricated into a module as a set of press unit, wherein a plurality of uprights are disposed between the respective bed sections and crown sections, the bed sections and the crown sections are coupled and fastened by means of tie rods inserted into the uprights, and reinforcing means are disposed to the uprights at positions higher than a lower dead point of the slide sections for coupling adjacent uprights together.
To achieve the above object, according to another embodiment of the present invention, there is provided a transfer press in which a crown is mounted between upper end portions of a plurality of uprights standing upward from a bed, and the crown and the bed are fastened by tie rods inserted into the uprights, wherein a reinforcing means is disposed to the uprights at a position higher than a lower dead point of a slide for coupling adjacent uprights together.
According to the structures mentioned above, since the rigidity of the press body in the horizontal direction is remarkably improved, the press body is never swung in the horizontal direction during the working, thereby a press molding with high precision is performed.
Furthermore, since the horizontal direction rigidity of the press body can be increased without increasing the width of the upright, it is not necessary to make large the pitch of the working station, thus reducing the entire length of the press body, whereby the press body can be made small in size which results in the reduction of the installation space and cost.
In the above structures, it is preferred that a divided crown section of a press unit provided for a first working station and a divided crown section of a press unit provided for a second working station are coupled together by means of a coupling member.
According to this structure, in a case where the press unit for the first working station is separated from the press units of the second and succeeding working stations, the divided crown section of a press unit provided for the first working station and the divided crown sections of the press units provided for the second and succeeding working stations are firmly coupled together by means of the coupling members, so that the rigidity of the entire press body in the horizontal direction can be improved, and also, since the horizontal direction rigidity of the press unit for the first working station can be improved, the working precision in the first working station can be also improved.
Furthermore, in the above structure, it is preferred to arrange the coupling members substantially in parallel to a workpiece conveying direction.
According to this structure, the oscillation caused in a horizontal direction in the press unit for the first working station can be effectively transferred to the press units for the second and succeeding working stations through the coupling members, so that the horizontal direction oscillation caused in the first working station can be effectively reduced.
Furthermore, in the above structure, it is preferred to provide a damping function to the coupling member.
According to this structure, the horizontal direction oscillation and vibration generated in the press unit for the first working station is reduced by the damping function of the coupling members and reducedly transmitted to the press units for the second and succeeding working stations, so that the horizontal direction oscillation and vibration generated in the press unit for the first working station do not give an adverse influence to the second and succeeding working stations, and also, the horizontal direction oscillation and vibration generated in the press units for the second and succeeding working stations do not give an adverse influence to the first working station.
Furthermore, in the above structure, it is preferred to provide a cover member above the reinforcing means.
According to this structure, noise caused by the slide driving mechanism is not diffused therearound, so that the noise can be reduced, a
Nishida Kenji
Watanabe Shouji
Huynh Louis
Kananen Ronald P.
Komatsu Ltd.
Rader Fishman & Grauer
Vo Peter
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