|Title of Invention||
A SUDDEN BRAKING APPARATUS FOR A PRESS
|Abstract||The present invention relates to a sudden braking apparatus of a press, on a press which comprises a flywheel (5) and a small gear (9) combined through the medium of a pulley and a belt of driving motor mounted on a rotational axis (3) installed horizontally to a supporting frame, a slide-block (12) and a large gear mounted on the crankshaft which is set up under the rotational axis (3) and, in addition, a small gear (9) and large gear engaged with each other so that the large gear (10) rotates with the rotatory force transmitted through the flywheel (5) and then makes the slide-block (12) elevate up and down, which is characterized in that the apparatus comprises a circular guide (19) set up to the crankshaft (11b) and having a lining (16), a radial toothed gear (18) and a groove (15) taperingly formed along the side of the circumference in the central part of the body; a clutch plate (22) having a radial toothed gear matching the radial toothed gear (18) fixed to a large gear (10); and a fork (24) having one pair of rollers installed on the end parts of both sides of the body for free rotation and installed to the supporting frame (2).|
|Full Text||FIELD OF THE INVENTION
The present invention relates to a sudden breaking apparatus for a press, in particular to a sudden braking apparatus for the power press, to prevent accidents during the operation of the press by making it possible to instantaneously stop the operation of the press.
BACKGROUND OF THE INVENTION
In general, the press is typically of dangerous machine which causes industrial accidents in the field of manufacturing. Even though presently the number of industrial accidents is decreasing, the rate of accidents due to presses is not decreasing, and therefore a countermeasure to rectify this problem is required.
Furthermore, because conventional presses are mostly pin-clutch types, even if such circumstances as a finger of operator getting into the press mold owing to carelessness on the part of the operator arise, the operation of the conventional press cannot be stopped suddenly. A press, which is composed of an air-clutch enabling the press to stop instantaneously using a sensor such as an infrared beam switch, is widely known to prevent the above problem in the event of such dangerous situations. However, as the price of such a press is high, it is difficult for small-scale manufacturing companies to purchase it.
In addition, the basic structure of the air-clutch part is so complex that it has many parts which need to be remodeled when the press is provided with the air-clutch. Furthermore, as the price of the air-clutch is high, if the conventional model is to be converted into a new one having the air-clutch, then this should be carried out by specialized persons. Therefore, because of the financial losses due to idle time due to conversion and the high cost incurred by conversion, the conventional press is still used and the danger of accidents is tolerated.
SUMMARY OF THE INVENTION
The present invention is presented to solve the aforementioned problem and it is an object of the present invention to provide a sudden braking apparatus using braking system disposed at the crank shaft of the press, by which the operation of the slide block can be braked instantaneously, thereby preventing operator"s accidents, reducing the manufacturing
costs and achieving easy conversion as well as achieving prompt operation due to its being controlled directly and not through a large gear.
In order to achieve the aforementioned object, the present invention relates to a sudden braking apparatus for a press comprising a driving motor, a flywheel connected to the motor through a pulley and a belt, a small gear connected to the flywheel through a rotational shaft installed horizontally to a supporting frame, a large gear engaged with the small gear and installed on a crankshaft of the press, and a cam mounted at the crankshaft and connected to a slide-block via a crank rod, characterized in that the apparatus comprises a circular guide slidably set up to the crankshaft to rotate therewith and having a brake lining on one side of the guide toward the supporting frame, a radially toothed gear on the other side of the guide and a groove taperingly formed along the circumference in the central part of the guide; a clutch plate having a radial toothed gear matching the radial toothed gear and fixed to a large gear which is set up to rotate freely at the end part of the crankshaft; and a shifting means which enables the circular guide to move horizontally, and is installed between the circular guide and the supporting frame, wherein the shifting means comprises a fork installed on the circular guide and connected to a cylinder through an operating rod so that the operation rod and the fork an shift the circular guide, and roller mounted on both ends of the fork.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an outline cross-sectional view showing a sudden braking apparatus for a press according to the present invention;
Fig. 2 is a perspective view of the main part so as to explain the braking principle according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings.
As shown in Fig. 1, the present invention comprises a supporting frame 2
fixed vertically to a base 1, a rotational axis 3 set up horizontally to the upper part of the supporting frame 2, a flywheel 5 provided with a pulley 7 mounted to one end part of the rotational axis 3 and connected to the rotational axis(not shown) of the driving motor 6 through a pulley 4 and a belt 8. A small gear 9 is mounted at the other end part of the rotational axis 3 and engaged with a large gear 10 described later so that torque is transmitted from the flywheel 5 to the large gear 10.
Furthermore, a crankshaft, disposed below the rotational axis, is divided into two pans 11 a,llb, which have a polygonal section and a circular section respectively. The crankshaft 1 la,l lb is installed in parallel with the rotational axis 3 by means of a bearing(not shown).
In addition, the crankshaft 1 la,l lb is connected with a cam 14 installed to a crank-rod 13 which enables the slide-block 12 to elevate. A circular guide 19 is disposed at polygonal of the crankshaft 1 lb. A groove 15 is formed taperingly along the side of the circumference in the middle part of the surface of the circular guide 19, a brake lining 16 is attached to one side of the circular guide 19 and on the other side corresponding to this the radially toothed gear 18 is installed by jointing means such as a bolt 17.
Furthermore, a large gear 20 equipped with a clutch plate 22 on which the radially toothed gear 21 is fixed by jointing means such as a bolt 20 with a shape matching the radially toothed gear 18 disposed on the circular guide 19 is set up to rotate freely at the end part of one side of the crankshaft 1 lb as shovm in Fig 2, and this large gear is engaged with the small gear 9.
In addition, a fork 24 is located over the circular guide 19, and the fork 24 moves backward(left) and forward(right) according to the stretching action of a hydraulic cylinder mounted on the upper part of the supporting fi-ame 2. The fork 24 is connected as one body to an operation rod 26 of which the body 25 is in the shape of a horse hoof, and is set up vertically to the piston rod 29 of the cylinder. To both end parts of the body 25, one pair of rollers 28 are mounted through a shaft 27 and the rollers 28 constitute a section of a circular cone shape
hich has the same slope as the oblique section of the groove 15.
In Fig. 1, the roller part(A,A") are shown at the position of 90° rotation, in der to display the total parts.
Furthermore, in the entry part of the mold of the sudden braking apparatus r the press according to the present invention, a sensor such as a photo nsor(not shown) is installed to be connected with the cylinder 23 electrically. consequently, during the elevating motion of a slide-block 12, in the event of ngerous situations such as when a hand is held between the mold owing to an •erator"s carelessness and so on, the sensor perceives this situation and makes 2 piston-rod 29 move backward by applying the control power to the cylinder . Any of either a hydraulic or a pneumatic pressure may be used as a working lid.
The operation and effect according to the present invention are as follows. The sudden braking apparatus for the press according to the present /ention is characterized in that if the sensor detects a dangerous situation and ikes the cylinder 23 work, then the fork 24 enables the circular guide 19 to 5ve, which artificially prevents the large gear 10 from rotating and nsequently enables the operation of the slide-block 11 installed to the mkshafts 1 la,llb to stop promptly.
That is, if the press 29 is turned on, then a driving motor 6 operates and nsmits its torque to the flywheel 5 through the belt 8, which enables the small ar 9 mounted to the rotational axis 3 and the large gear 10 engaged with the all gear 9 to rotate at the same time.
Furthermore, under such condhions, if the cylinder is made to move ■ward(right) by operating a switch such as a foot switch installed to the press , then the fork 24 being pushed out by the operation rod 26 and the circular ide 19 moves in the direction shown in the dotted line in Fig 2, that is, in the ection of the large gear 10.
Accordingly, the rotational force of the large gear 10 is transmitted to the mkshaft llb owing to the fact that the radial teeth 18,21 are engaged with
each other and so the slide-block 12 elevates upward and downward by means of a cam 14 which enables the press to work the target.
Furthermore, during the operation of the press, if dangerous situations arise such as the operator"s hand being held between the mold, then due to the
sensor which perceives this situation, the required control power is applied to the cylinder 23, which makes the piston rod 29 move backward. Following this, the fork 24 is pushed in the direction of the supporting frame 2 which is the direction shown in the solid line in Fig 2, through the operation rod 26, which causes the separation of the radial teeth 18,21 and as a result of the separation,
the force of inertia of the flywheel 5 can not be transmitted to the crankshaft. In addition, the lining 16 mounted on the circular guide 19 sticks to the side wall of the supporting frame 2, so that it controls the rotation of the crankshaft 1 lb. As a result, the rotation of the circular guide 19 and the crankshaft can be suddenly halted. Accordingly, it is possible to stop the elevating motion of the slide-block
Meanwhile, the roller 28 installed to the fork 24 which moves backward and forward by the operation rod 26 comprises a section of a circular cone shape which has the same slope as the oblique section of the tapered groove 15 of the circular guide 19, so that it is possible to reduce to a minimum abrasion owing to
fiiction with the groove 15 in the event of moving back and forth. Therefore, the fork can be shifted smoothly without frictional resistance with the circular guide 19.
The present invention can be realized in various ways without departing from the sprit and scope of the invention. In addition, the present invention is
not limited to the illustrated and explained embodiment. All variations within the above description and following claims will be included in the scope of the present invention.
1. A sudden braking apparatus for a press comprising a driving motor (6), a flywheel (5)
connected to the motor through a pulley (7) and a belt (8), a small gear (9) connected to the
flywheel through a rotational shaft (3) installed horizontally to a supporting frame (2), a large
gear (10) engaged with the small gear and installed on a crankshaft (1 lb) of the press, and a cam
(14) mounted at the crankshaft (11a, llb) and connected to a slide-block (12) via a crank rod
(13), characterized in that
the apparatus comprises a circular guide (19) slidably set up to the crankshaft (llb) to rotate therewith and having a brake lining (16) on one side of the guide (19) toward the supporting frame (2), a radially toothed gear (18) on the other side of the guide and a groove (15) taperingly formed along the circumference in the central part of the guide;
a clutch plate (22) having a radial toothed gear (21) matching the radial toothed gear (18) and fixed to a large gear (10) which is set up to rotate freely at the end part of the crankshaft (llb); and
a shifting means which enables the circular guide (19) to move horizontally, and is installed between the circular guide and the supporting frame (2), wherein the shifting means comprises a fork (24) installed on the circular guide (19) and connected to a cylinder (23) through an operating rod (26) so that the operation rod (26) and the fork (24) can shift the circular guide (19), and roller (28) mounted on both ends of the fork (24).
2. A sudden braking apparatus for a press substantially as herein described with reference to the accompany drawings.
|Indian Patent Application Number||IN/PCT/2000/460/CHE|
|PG Journal Number||13/2008|
|Date of Filing||29-Sep-2000|
|Name of Patentee||HUH, Myung, Ho|
|Applicant Address||1055-52, Kwangan-dong, Sooyung-ku, Pusan 613-100,|
|PCT International Classification Number||B30B 15/10|
|PCT International Application Number||PCT/KR99/00158|
|PCT International Filing date||1999-04-01|