1. Field of the Invention
This invention relates to a holding device and relates particularly to a holding device of a forming machine or a press forming machine.
2. Description of the Related Art
A typical processing operation of parts, such as screws and nuts, is to feed rods directly to a forming machine and cut the rods into blanks with a proper length. The blanks are then pressed by multiple dies of the forming machine. To facilitate the processing work, a clamping device is usually mounted between dies of the forming machine to clamp and move the blanks in sequence. Accordingly, the blanks can be subjected to different process in different steps of the processing operation. Therefore, the arrangement of the clamping device is important to the processing operation because the upward and downward movement, the displacement and the clamping and releasing behavior of the clamping device affect the pressed state of the blank. However, the typical processing operation can merely focus on the step of pressing one end of the blank. If two ends of the blank are to be pressed, the two ends have to be pressed one after the other owing to the clamping device which cannot turn. Hence, the typical design of the clamping device lowers the speed of the pressing process, requires many processing steps, causes the operation to be more complex, and creates a large number of defective goods. Thus, the cost cannot be reduced.
Therefore, some firms invent a rotatable clamping device to clamp and rotate the blank to the next processing after one end of the blank is finished pressing. In use, the clamping device limited by the immovable moving range cannot efficiently catch or release the blanks during the processing operation. To solve the problem, an auxiliary push unit is set between the dies to push the blank. In other words, the clamping device moves the blank to a place where the push unit is located, and the push unit pushes the blank forward, thereby allowing the clamping device to clamp the blank and subjecting the blank to a further pressing process. However, the added push unit inevitably increases the cost, and the processing operation becomes more complex and requires more processing steps. Thus, the processing speed is still affected, and this requires an improvement.
The object of this invention is to provide a holding device of a forming machine which carries out a catching and releasing operation and a clockwise or counterclockwise rotation in order to largely increase the smoothness of the processing operation and attain a quick forming operation.
The holding device of the forming machine in accordance with this invention comprises a base, a rotating set penetrating through the base, a clamping set disposed under the base, and a transmission set driving a rotation of the rotating set. The rotating set includes a hollow sleeve pivotally disposed on the base and a rotating base fixed to the hollow sleeve. The rotating base has an accommodation space formed therein, and the accommodation space communicates with a hollow space defined in the hollow sleeve. Besides, the clamping set has a link axle penetrating through the hollow sleeve for providing an upward and downward movement, a link unit driven by the link axle, and two clamping units driven by the link unit and adapted to carry out a clamping action. Further, the transmission set includes a driving unit disposed on the hollow sleeve and a transmission unit driving a rotation of the driving unit. Accordingly, when the clamping set is driven by the rotating set, the link unit driven by the link axle activates an operation of the two clamping units to catch blanks. The driving unit rotated by the transmission unit makes the link axle, the rotating base and the clamping set rotatably turned in a clockwise or counterclockwise direction by 180 degrees at the same time, thereby adjusting a position of the holding device between the dies of the forming machine according to the need. Thus, this invention largely increases the smoothness of the processing operation, omits the unnecessary dies and attains a quick forming operation.
Preferably, each clamping unit comprises a clamping arm and a clamping jaw connected to the clamping arm.
Preferably, the rotating set comprises a bearing disposed around the hollow sleeve and located between the rotating set and the base.
The advantages of this invention over the known prior arts will become more apparent upon reading the following descriptions injunction with the accompanying drawings.
The clamping set 13 includes a link axle 131 penetrating through the hollow sleeve 121 for providing an upward and downward movement, a link unit 132 driven by the link axle 131, and at least two clamping units 133 driven by the link unit 132. Each of the clamping units 133 has a clamping arm a1 and a clamping jaw a2 connected to the clamping arm a1. Top ends of the two clamping arms a1 of the two clamping units 133 cross together and pivotally connected to the link unit 132 by a connecting unit b. The link unit 132 driven by the link axle 131 activates an operation of the two clamping units 133 in order to allow the clamp jaws a2 of the clamping units 133 to catch or release blanks (not shown).
Further, the transmission set 14 includes a driving unit 141 disposed on the hollow sleeve 121 and a transmission unit 142 driving a rotation of the driving unit 141. The link axle 131, the rotating base 122 and the clamping set 13 are concurrently rotatably turned in a clockwise or counterclockwise direction by 180 degrees by transmission set 14 in order to adjust a position of the holding device 1 between the dies of the forming machine according to the need.
The use of this invention is described with the aid of
During the time that the holding device 1 moves to the next pressing process, the driving unit 141 disposed on the hollow sleeve 121 rotates under the control of the transmission unit 142. This rotation causes the link axle 131, the rotating base 122 and the clamping set 13 to be concurrently rotatably turned in a clockwise or counterclockwise direction by 180 degrees, as shown in
To sum up, this invention takes advantage of the rotating set, the clamping set and the transmission set which are not fixed to the base to adjust a position of the holding device between the dies of the forming machine according to the need. Further, the holding device carries out a catching and releasing operation and a clockwise or counterclockwise turning action by 180 degrees to increase the smoothness of the multiple pressing operation, omit the unnecessary dies or tools to reduce the cost and attain a quick forming operation.
While the embodiments of this invention are shown and described, it is understood that further variations and modifications may be made without departing from the scope of this invention.
Number | Date | Country | Kind |
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104132640 | Oct 2015 | TW | national |