KR20180109150A - Driving apparatus of knuckle press - Google Patents

Abstract

The present invention relates to a knuckle press operating apparatus with a down stroke movement delay characteristic and, more specifically, to a knuckle press operating apparatus with a down stroke movement delay characteristic, which smoothly delays a descending speed in a down stroke section for descending a slider from a top dead point to a bottom dead point to improve molding quality of a molding product and main high load components are uniformly disposed to equally distribute static and dynamic loads so as to prevent deformation of a frame and secure operational stability. According to the present invention, the knuckle press operating apparatus with a down stroke movement delay characteristic installed in the frame of a knuckle press comprises: a power generation unit including a flywheel rotated by a driving force applied from a motor; a power transfer unit including a driving gear formed on a driving shaft having the flywheel installed thereon to be rotated and a main gear receiving the rotational force from the driving gear to be rotated; an operational unit including a link mechanism formed to elevate the slider and a connecting rod connected to the link mechanism to transfer the driving force; a crankshaft, wherein the connecting rod is connected to a crank pin portion; and a down stroke delay means connecting one side to the main gear and connecting the other side to the crankshaft to delay a down stroke movement of the slider. One end of the crankshaft is eccentrically inserted into the main gear to receive power from the down stroke delay means.

Description

[0001] DRIVING APPARATUS OF KNUCKLE PRESS [0002]

The present invention relates to a knuckle press driving device having a downward stroke delay characteristic, and more particularly, to a knuckle press driving device having a lowering speed at a lower stroke section from a top dead center to a bottom dead center at which a slider descends, And a knuckle press having a downward stroke delay characteristic capable of preventing the deformation of the frame and ensuring the stability of operation by uniformly distributing the static load and dynamic load by arranging the main heavy load components evenly, Driving device.

Generally, a knuckle press is a mechanical press which is widely used as a press for precision compression processing, embossing, extrusion, forging and the like because the upper die is softly contacted with the lower die for a long time during the stamping process of the product in a mechanical press.

Such a knuckle press has a long molding time compared to other mechanical presses because of a long contact time between the upper mold and the lower mold. However, the lowering operation of the slide which determines the molding quality at the time of punching (when the slider is lowered, High molding quality is obtained) is performed as quickly as other mechanical presses. As a result, defective products are mass-produced and molding quality is deteriorated at the time of molding such as drawing, precision machining, and flatness, that is, a slide opening / closing cell-phone case.

Due to such a problem, Korean Patent Registration No. 10-0473890 proposes a knuckle press as shown in Fig. 1A.

The knuckle press according to Korean Patent No. 10-0473890 includes a connecting rod 50 formed in a straight shape from one side connected to a fryer wheel, an upper link 60 connected to the connecting rod on the lower side and disposed upward, And a lower link 70 having an upper side connected to the lower side and a length L4 shorter than a length L3 of the upper link 60. [ A controller 140 for pressing and fixing the plate material at the time of punching, a hydraulic pressure generator 150, and a plate material clamping and fixing means 160.

The vertical reciprocating speed of the slider 80 is somewhat slower as it approaches the bottom dead point due to the difference in length between the length L3 of the upper link 60 and the length L4 of the lower link 70, (A region) of the slider 80 as shown in Fig. 1B because the link 80 is operated by the linking motion of the upper link 60 and the lower link 70 operated by the connecting rod 50 The time of the up stroke (area b) and the movement line appear the same.

In other words, in the conventional knuckle press, although the moving speed is moderately slowed down when the slider is lowered, the knuckle press is not so gentle as to improve the molding quality, and the moving speed And the overall operation time is increased, resulting in a decrease in productivity.

In addition, since the conventional knuckle press must include a controller 140, a hydraulic pressure generator 150, and a plate material pressing and fixing means 160 for pressing and fixing the plate material when the slider is pushed down, the equipment becomes complicated, This is caused by malfunctions or malfunctions as a result of obstacles to production.

In order to solve the problem of the knuckle press according to Korean Patent No. 10-0473890 as described above, the present inventor has developed a knuckle press driving device disclosed in Korean Patent Registration No. 10-1133635 .

The drive device for the knuckle press according to Korean Patent Registration No. 10-1133635 comprises a central connecting portion 71 connected to the main gear 50 as shown in Fig. 2, a central connecting portion 71 And a second connecting portion 73 formed on the other side of the central connecting portion 71. The second connecting portion 73 has a structure in which the first connecting portion 72 is formed to connect the link mechanism 60 to one side of the central connecting portion 71, And a connecting rod control link 80 connected thereto.

The driving device of the knuckle press according to Korean Patent Registration No. 10-1133635 is characterized in that during the descending stroke of the slider, due to the interaction of the connecting rod having the first and second connecting portions, the connecting rod delay link and the connecting link, The molding quality of the molded product can be remarkably improved.

However, as shown in FIG. 2, the knuckle press driving device according to Korean Patent Registration No. 10-1133635 includes a high-load component such as an electric motor 20, a flywheel 40, a main gear 50, The rod 70 or the like is biased to one side of the frame, causing a slight vibration when the slider 30 is lowered, resulting in a defect in molding of the molded product.

When the electric motor 20, the flywheel 40, the main gear 50, the connecting rod 70 and the like are projected to one side, the height, volume, and size of various components such as the frame are increased. The amount of material to be used is increased, resulting in an increase in material costs and manufacturing labor costs. In addition, the increase in the volume and weight of the knuckle press increases the occupied space of the building in which the press is installed, which unnecessarily entails an increase in the cost of the equipment, resulting in an increase in indirect costs such as manufacturing, transportation, installation and maintenance costs do.

2, the knuckle press driving apparatus includes a motor 20, a flywheel 40, a main gear 50, a connecting rod 70, and the like, which are high in the rear direction of the frame 10 The use of the power transmission portion including the power transmission portion is disadvantageously deteriorated due to the deformation due to the misalignment when used for a long time, and the molding quality is also poor.

In addition, the conventional knuckle press driving apparatus is provided with a flywheel 40, a main gear 50, a link mechanism 60, a connecting rod 70, etc., which are required to be maintained or replaced due to abrasion or the like, Since the knuckle press is totally disassembled at the time of the operation, the working time is excessively increased, resulting in an increase in the maintenance cost and a decrease in productivity due to an increase in the downtime.

Korean Registered Patent No. 10-0473890 "Knuckle Press" Korean Registered Patent No. 10-1133635 "Driving Device of Knuckle Press"

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above description, and it is an object of the present invention to provide a slider with a slider lowered gradually in a lower stroke section from a top dead center to a bottom dead center, And a knuckle press driving device having a downward stroke delay characteristic capable of improving the molding quality of a molded product.

It is another object of the present invention to provide a method and a system for preventing the deformation of a frame by uniformly distributing a static load and a dynamic load by uniformly arranging the main heavy load components, And to provide a knuckle press drive device having motion delay characteristics.

It is another object of the present invention to provide a power transmission device capable of partially disassembling and performing maintenance and replacement operations of the power transmission unit quickly and easily, thereby reducing maintenance costs and improving productivity through reduction of downtime And to provide a knuckle press driving device having a lowered stroke-stroke delay characteristic that can improve work environment by preventing noise and prevent industrial disaster.

In order to achieve the above object, a knuckle press driving device having a downward stroke delay characteristic according to the present invention is a knuckle press driving device having a lower stroke delay characteristic installed in a frame of a knuckle press, A power generating unit having a flywheel rotated by the flywheel; A power transmission unit having a drive gear formed on a drive shaft provided with the flywheel and rotated, and a main gear rotated by receiving a rotational force from the drive gear; And a link mechanism configured to move the slider upward and downward, and an operating portion connected to the link mechanism and having a connecting rod for transmitting a driving force, the crank shaft having the connecting rod connected to the crank pin portion; Further comprising a lower stroke delay means having one end connected to the main gear and the other end connected to the crankshaft to delay the lower stroke of the slider, one end of the crankshaft being eccentrically inserted into the main gear, And is connected to receive power from the delay means.

The lower stroke-stroke extending means includes a first link member having one side fixed to the crankshaft, a second link member having one side connected to the periphery of the main gear and the other side connected to the other side of the first link member .

Preferably, the crankshaft is rotatably mounted on the frame by a first shaft support member into which one end is inserted and a second shaft support member into which the other end is inserted, and the main gear is provided with a gear body A pin insertion hole is formed at the center of the first shaft supporting member and the pin coupling hole is formed so as to be inserted and fixed so that the power transmission pin for connecting the second link member is in contact with the support insertion hole And the first shaft support member has a structure in which an eccentric hole for inserting the crankshaft is formed in a disk-shaped projection portion inserted into the support portion insertion hole, and is fixed to the main gear by a fixing flange have.

On the other hand, the link mechanism includes a driving link having one side connected to the connecting rod, an auxiliary driving shaft having one side connected to the other side of the driving link and the other side connected to the slide, and inserted into the driving link; And a power transmission gear disposed in the auxiliary drive shaft and disposed between the drive gear and the main gear.

The drive shaft is disposed at the front and rear of the frame, the flywheel is connected to the rear portion so that the power generating portion is disposed at a rear portion of the frame, and the drive gear is disposed at all such that the power transmitting portion is disposed at a front portion of the frame .

The power transmission gear portion includes a first power transmission gear installed on the auxiliary drive shaft and engaged with the drive gear, a second power transmission gear disposed on the auxiliary drive shaft in contact with the first power transmission gear, And the like.

According to another aspect of the present invention, there is provided a knuckle press driving device having a lower stroke stroke delay characteristic, wherein the crank pins of the crankshaft are constituted by a pair, and the crank pin is provided with a double It can be implemented as a knuckle press.

According to the knuckle press driving device having the downward stroke delay characteristic according to the present invention, the lowering speed is gently delayed by the action of the lower stroke delay means in the lower stroke section from the top dead center to the bottom dead point where the slider descends, It is possible to remarkably improve the molding quality, and the rising speed is increased and the rising time is shortened during the lifting stroke of the slider, so that productivity can be stably maintained by shortening the working time during molding.

According to the knuckle press driving device having a downward stroke delay characteristic according to the present invention, since the power transmitting portion, the operating portion and the power generating portion are uniformly arranged from the front to the rear of the frame, the static load and the dynamic load of the driving device are uniformly distributed It is possible to prevent the deformation of the frame and secure the stability of operation, thereby improving the molding quality.

In addition, according to the knuckle press driving device having the downward stroke delay characteristic according to the present invention, the stroke distance of the slider can be freely adjusted by changing the design of the crankshaft, the arrangement of the power transmission portion, By optimizing the design, it is possible not only to avoid interference with other components in the process of changing the stroke distance, but also to realize various knuckle press products having simple structure and simple structure.

FIGS. 1A, 1B and 2 are views for explaining a conventional knuckle press,
FIG. 3A is a perspective view showing an external structure of a knuckle press equipped with a knuckle press driving device having a downward stroke delay characteristic according to a first embodiment of the present invention; FIG.
FIG. 3B is a perspective view illustrating a knuckle press driving apparatus having a downward stroke delay characteristic according to the first embodiment of the present invention. FIG.
FIG. 4 is an exploded perspective view of a knuckle press driving apparatus having a downward stroke delay characteristic according to a first embodiment of the present invention. FIG.
FIG. 5 is a perspective view showing a main portion of a knuckle press driving apparatus having a downward stroke delay characteristic according to the first embodiment of the present invention; FIG.
FIG. 6 is an exploded perspective view showing a main part of a knuckle press driving apparatus having a lower stroke delay characteristic according to the first embodiment of the present invention; FIG.
FIGS. 7A to 7H are views for explaining the operation of the knuckle press driving device having a downward stroke delay characteristic according to the first embodiment of the present invention. FIG. 7A shows a state where the slider is located at the top dead center, FIGS. 7A, 7B, 7C, and 7D show a state in which the slider is sequentially lowered at an angle of 45 degrees from the top dead center, FIG. 7E shows a state where the slider is positioned at the bottom dead center, And a state of sequentially rising from the bottom dead center at an angle of 45 degrees.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 3A to 7H, wherein like reference numerals are used to designate like elements in FIGS. 3A to 7H. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

FIG. 3A is a perspective view showing the external structure of a knuckle press equipped with a knuckle press driving device having a lower stroke delay characteristic according to the first embodiment of the present invention. FIG. FIG. 4 is a perspective view showing a knuckle press driving apparatus having a downward stroke delay characteristic according to a first embodiment of the present invention, FIG. 5 is a perspective view showing a knuckle press driving apparatus according to a first embodiment of the present invention FIG. 6 is an exploded perspective view of a knuckle press driving device having a downward stroke delay characteristic according to a first embodiment of the present invention. FIG. 6 is a perspective view illustrating a knuckle press driving device according to an embodiment of the present invention.

3A to 6, a knuckle press driving apparatus having a downward stroke delay characteristic according to a first embodiment of the present invention includes a power generating unit 1 having an electric motor (not shown) and a flywheel 12, An operating portion 3 including a power transmitting portion 2 including a driving gear 21a and a main gear 22, a link mechanism 31 and a connecting rod 32, a crank A lower stroke delay means 6 for delaying the lower stroke motion of the shaft 4 and the slider 5 is built in the frame 100 of the knuckle press.

The crankshaft 4 has a rod-shaped shaft 41, a pair of crank arms 42 projecting to the shaft 41, and a rod-shaped crank pin 43 connected between the pair of crank arms 42 One end of the crankshaft 4 is connected to receive the power from the lower stroke delay means 6. [ At this time, the crankshaft 4 is inserted eccentrically into the main gear 22 and is connected to the lower stroke delay means.

The crankshaft 4 is disposed at the other side edge portion of the frame 100 in parallel with the drive shaft 21 and has one end and the other end rotatably mounted on the frame 100, And a connecting rod 32 is connected to the connecting rod.

The crankshaft 4 includes a first shaft support member 45 inserted into one end of the crankshaft 4 so as to be rotatably mounted on the frame and a second shaft support member 46 inserted and installed at the other end thereof .

In addition, the crankshaft 4 performs a function similar to that of the eccentric cam used in a conventional knuckle press to translate the connecting rod 32. As will be described in detail below, in the conventional knuckle press When the crankshaft 4 is used in place of the eccentric cam, the range of translation of the connecting rod 32 can be increased and the stroke of the slider 5 can be increased.

The first shaft support member 45 includes an eccentric hole 452 in which the crankshaft 4 is inserted into a disk-shaped protruding portion 451 inserted into the support portion insertion hole 222 of the main gear 22 to be described later, And a supporting flange portion 453 is formed. Here, the eccentric hole 452 is composed of a hole eccentrically perforated on one side of the disk-shaped protruding portion 451, as the term implies.

 A bolt fastening hole 454 is formed in the disk-shaped protruding portion 451 so that the first shaft supporting member 45 is fastened and fixed to the main gear 22 by bolts via the fixed flange 26.

The second shaft support member 46 is formed with a center hole 462 through which the other end of the crankshaft 4 is inserted and a support flange portion 463 fixed to the frame 100, Structure.

Bushings 457 and 467 are inserted into the center holes 462 of the first shaft supporting member 45 and the second shaft supporting member 46 for smooth rotation of the crankshaft shaft 41 have.

The lower stroke delay means 6 is configured to transmit the rotational force for driving the operating portion 3 to the crankshaft 4 so that the delay characteristic of the lower stroke motion of the slider 5 is exerted, A link member 61, and a second link member 62 are provided.

The first link member 61 is a component to which one end of the first link member 61 is inserted and fixed to the crankshaft 4. The first link member 61 includes a cylindrical body 611 having a crankshaft insertion hole 611a into which the crankshaft 4 is inserted, And a pair of link protrusions 612 formed with protrusions 612a are protruded. Here, the cylindrical body 611 is formed with a key groove to be fixed to a key groove formed in the shaft of the crank shaft 4 by a key (not shown) fixing method.

The second link member 62 has one side connected by the power transmission pin 63 in the vicinity of the periphery of the main gear 22 and the other side connected to the other side of the first link member 61 by the pin 64 As a component, a pin insertion hole 622 is formed at both ends of a substantially arc-shaped link body 621.

The main gear 2 includes a support portion insertion hole 222 formed at the center of a gear body formed with a gear portion on an outer circumferential surface of the first shaft support member 45 to insert and fix the first shaft support member 45, And a pin binding hole 223 formed to be inserted and fixed to the power transmission pin 63 for connecting the second link member 62 in contact therewith. A pin fixing plate 65 having a disk shape is bolted to the end of the power transmission pin 63 and the pin 64.

Hereinafter, the power generating unit 1, the power transmitting unit 2, and the actuating unit 3 applied to the knuckle press driving apparatus having the downward stroke delay characteristic according to the present invention will be described in detail.

The power generating unit 1 includes an electric motor (not shown) disposed at an upper portion of the frame and generating power, a flywheel 12 rotated by a driving force applied from the electric motor, A flywheel 12 is connected to the rear portion of the drive shaft 21 so as to be located at the rear side and an electric motor (not shown) is provided in a frame corresponding to the upper portion of the flywheel 12. [

The flywheel 12 has a structure in which a belt groove is formed on the outer circumferential surface of a disk-shaped body having a large diameter, which is connected to the electric motor by a belt (not shown) and is rotated. One end of the flywheel 12 is engaged with the belt groove 122, (Not shown) in which the other end is hooked to the pulley.

The flywheel 12 is provided with a clutch device (not shown) capable of interrupting the transmission of power. This clutch device performs an intermittent function to transmit or interrupt the rotational force of the flywheel 12 to the drive shaft 21. [

On the other hand, the power transmitting portion 2 is provided with a drive shaft 21 installed in the front-rear direction of the frame at the center of the flywheel 12, a drive gear 21a formed and rotated on the drive shaft, And a main gear 22 that receives rotation force from the torque transmission gear portion 23 and is rotated.

The power transmission gear portion 23 includes a first power transmission gear 23a provided on the auxiliary drive shaft 25 to be engaged with the drive gear 21a and a second power transmission gear 23b connected to the first power transmission gear 23a And a second power transmission gear 223b provided on the drive shaft 25 and engaged with the main gear 22.

More specifically, the auxiliary drive shaft 25 is disposed in parallel to the drive shaft 21, and the center support portion 311a of the drive link 311 and the power transmission gear portion 23 are inserted.

The driving force transmitting portion 2 is coupled to the front portion of the driving shaft 21 so as to be disposed at the front portion of the frame 100. The first driving force transmitting gear 23a meshes with the driving gear 21a, And the second power transmission gear 23b is coupled to the auxiliary drive shaft 25 in contact with the first power transmission gear 23a while the main gear 22 meshes with the second power transmission gear 23b. .

The operating portion 3 includes a link mechanism 31 configured to move the slider 5 up and down and a connecting rod 32 connected to the link mechanism 31 for transmitting the driving force.

The link mechanism 31 includes a driving link 311 having one side connected to the connecting rod 32 and a lifting link 311 having one side connected to the other side of the driving link 311 and the other side connected to the slide 5 side. (312).

More specifically, the actuating part 3 is provided with a driving link 311 at a substantially central portion of the auxiliary driving shaft 25 so as to be disposed at the central portion of the frame 100 as shown in Figs. 4, 6 and 7A, A lifting link 312 is connected to the lower side of the driving link 311 and a connecting rod 32 is connected to the upper side of the driving link 311. [

The driving link 311 includes a central support portion 311a formed with a pin insertion hole into which the auxiliary drive shaft 25 is inserted, a rod connection portion 311b protruded and formed on the upper side of the center support portion 311a, And a pair of link connecting portions 311c protruding at an obtuse angle from the rod connecting portion on the lower side of the connecting portion 2311a.

The lifting and lowering link 312 is formed as a straight link structure having upper and lower pin insertion holes and is connected to the link connecting portion 311c of the driving link 311 on the upper side and the plunger 51 .

The connecting rod 32 includes a connecting body 321 having a straight shape, a crank connecting portion 322 formed at one side of the connecting body 321 and having a pin connecting portion inserted and fixed to the crank pin 43, a connecting body 321 And a link-side connecting portion 323 in which a connecting hole is perforated so as to be connected to the driving link 311.

Hereinafter, the operation of the knuckle press driving apparatus having the downward stroke delay characteristic according to the first embodiment of the present invention will be described.

FIGS. 7A to 7H are views for explaining the operation of the knuckle press driving device having a downward stroke delay characteristic according to the first embodiment of the present invention. FIG. 7A shows a state where the slider is located at the top dead center, FIGS. 7A, 7B, 7C, and 7D show a state in which the slider is sequentially lowered at an angle of 45 degrees from the top dead center, FIG. 7E shows a state where the slider is positioned at the bottom dead center, FIG. 5 is a view showing a state of sequentially rising at an angle of 45 degrees from the bottom dead center. FIG.

7A to 7I, when the flywheel 12 is rotated by the rotational force transmitted from the electric motor (not shown) via the belt and the drive shaft 21 is rotated by the clutching operation of the clutch device The drive gear 21a coupled to the drive shaft 21 is rotated and the first power transmission gear 23a engaged therewith is rotated and the second power transmitted from the first power transmission gear 23a The transmission gear 23b is rotated.

When the second power transmission gear 23b is rotated, the main gear 22 coupled to the second power transmission gear 23b is rotated and rotational force is transmitted to the second link member 62 connected via the power transmission pin 63, 22 is rotated, the second link member 62 is moved along the rotational locus of the main gear to transmit the rotational force to the first link member 61 connected to the second link member 62.

When the rotational force is transmitted to the first link member 61 as described above, the crankshaft 4 to which the first link member 61 is fixed rotates, and when the connecting link 61 connected to the crank pin 43 of the crankshaft 4 rotates, The rod 32 translates by the cam action of the crank pin 43.

At this time, the translational force of the connecting rod 32 is transmitted to the drive link 311 and the lift link 312 which are connected to each other. At this time, since the main components of the operation part 3 are located at the center of the frame 100, the load distribution of the entire driving part is uniform and the load is evenly distributed in the power transmission process.

7B, 7C, 7D, and 7E illustrate the descending operation of the slider 5 (a state in which the top dead center point in FIG. 7A is directed to the bottom dead center 7e) When the connecting rod 32 is moved in the forward direction by the cam action of the crank pin 43 and pushes the rod connecting portion 311b side of the driving link 311, the link connecting portion 311c of the driving link 311 moves, Is rotated in one direction with reference to the center support portion 311a. When the driving link 311 is rotated in one direction, the lifting link 312 connected to the link connecting portion 311c interlocks and descends. At this time, since the slider 5 connected to the lifting link 312 is also lowered, the slipping force can be applied to the die (not shown) mounted on the die 120.

7F, 7G, 7H and 7A illustrate a lifting operation (a state of going from the bottom dead center 7e to the top dead center 7a) of the slider 5, and the first link member 62 connected to the second link member 62 7F, 7G, 7H and 7A, the connecting rod 32 is moved in the reverse direction by the cam action so that the rod connecting portion 311b of the driving link 311 And the link connecting portion 311c is rotated in the other direction with respect to the center support portion 311a. When the driving link 311 is rotated in the other direction, the lifting link 312 connected to the link connecting portion 311c is interlocked and raised. At this time, the slider 5 connected to the lift link 312 is also lifted to reach the top dead center as shown in FIG. 7A.

Since the second link member 62 is eccentrically connected to the main gear 22 in the course of performing the downward stroke and the upward stroke of the slider as described above, the connection point p1 and the main When the distance from the rotation center point p2 of the gear is directed to a point at a long distance, the radius of rotation is enlarged and expanded. When the distance between the connection point p1 and the rotation center axis p2 (hereinafter referred to as rotation radius) becomes short 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H while repeating the operations of the shapes shown in Figs. 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H in order.

At this time, the first link member 61 connected to the second link member 62 rotates the crankshaft 4. In the region where the turning radius is large, the crankshaft 4 rotates in the region where the rotation speed is slow and the turning radius is small The rotation speed is increased.

More specifically, FIG. 7A shows a state where the slider is located at the top dead center, and in this state, the second link member 62 rotates at a 45-degree angle and operates in the form shown in FIGS. 7B, 7C and 7D The slider is moved to the state of FIG. 7E where it is positioned at the bottom dead center.

As shown in Figs. 7F, 7G, 7H, and 7A, the turning radius r6, r7, r5 of the region where the slider moves from the bottom dead center to the top dead center varies in the order of r2, r3, , r8, and r1, the rotational speed of the crankshaft 4 becomes slow, and the moving speed of the slider from the top dead center to the bottom dead center becomes slow.

Conversely, since the second link member 62 has r6, r7, r8, r1 with a relatively small turning radius from the bottom dead center (Fig. 7E) to the top dead center (Fig. 7A), the rotational speed of the crankshaft 4 is increased, The slider 5 from the point to the top dead center is quickly raised.

As described above, since the lowering speed is gradually delayed in the lower stroke section of the slider 5 for forming the molded article by the action of the lower stroke delay means 6, the molding quality of the molded article can be remarkably improved and conversely, Since the rising speed is increased and the rise time is shortened in the stroke zone, a high-quality molded article can be molded without lowering the productivity.

In the knuckle press driving device having the downward stroke delay characteristic according to the first embodiment of the present invention, the connecting rod does not perform translational motion by the cam as in the conventional knuckle press but the crankshaft 4, The radius of the eccentric rotation of the crank pin 43 is increased by increasing the protruding height of the crank arm 42 at the time of designing and machining the crankshaft 4 so that the stroke of the slider 5 can be largely realized have. Accordingly, when the stroke of the slider is large, the knuckle press can be realized for forming a molded article which can be formed or can obtain satisfactory molding quality.

In other words, it is necessary to increase the diameter of the main gear in order to increase the diameter of the eccentric cam, and to change the size of the related components and rearrange them. However, (Not practically applicable to the space), it is possible to provide a crankshaft which is disposed at the edge of the frame so as to be relatively changeable in the protruding distance and not to cause interference with other components 4 can freely implement the translational motion range of the connecting rod 32. [

The knuckle press driving apparatus according to the first embodiment of the present invention has a drive transmission gear portion 23 and a drive shaft 21a for rotating the main gear 22 and a drive gear 21a The power transmission gear portion 23 does not need to be provided with a separate rotation shaft and can be used as a hinge shaft of the drive link 311 And the auxiliary drive shaft 25 is provided on the left side of the vehicle. Thus, the structure can be simplified and simplified.

The knuckle press driving apparatus according to the first embodiment of the present invention includes a power transmitting unit 2, an operating unit 3, and a power generating unit (not shown) from the front to the rear of the frame 100, 1) is uniformly distributed, static load and dynamic load are uniformly distributed, so that deformation of the frame can be prevented, stability of operation can be ensured, and molding quality can be improved.

As described above, the knuckle press driving apparatus according to the present invention has a downward stroke delay characteristic. Therefore, the present invention is not limited to the above-described embodiment, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

For example, although the knuckle press driving device having the downward stroke delay characteristic according to the present invention is not specifically described with reference to the drawings, the crank pin 4 is constituted of a pair of crank pins spaced apart at regular intervals, It is possible to realize a double knuckle press in which a pair of actuating portions 3 are configured in such a manner that a connecting rod 32 is connected to each pin and a link mechanism 31 is connected to each connecting rod 32. [

Here, the double-type knuckle press is generally provided with a link mechanism and a connecting rod to the slider so as to apply a stable striking force when the size or area of the slider is increased for the purpose of, for example, And a knuckle press constructed in such a manner as to increase the capacity of the electric motor.

The terms used in the above embodiments are used only to describe specific embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1: Power generating unit
12: Flywheel
2: Power transmission section
21:
21a: drive gear
3:
31: Link mechanism
32: Connecting rod
4: Crankshaft
5: Slider
6: Lower stroke delay means
61: first link member
62: second link member

Claims (6)

A knuckle press drive device having a downward stroke delay characteristic installed in a frame of a knuckle press,
A power generating unit having a flywheel rotated by a driving force applied from an electric motor;
A power transmission unit having a drive gear formed on a drive shaft provided with the flywheel and rotated, and a main gear rotated by receiving a rotational force from the drive gear; And
A link mechanism configured to move the slider up and down, and an operating portion connected to the link mechanism and having a connecting rod for transmitting a driving force,
A crankshaft to which the connecting rod is connected to a crank pin portion;
Further comprising a lower stroke delay means, one side of which is connected to the main gear and the other side of which is connected to the crankshaft to delay the lower stroke movement of the slider,
Wherein one end of the crankshaft is connected to receive the power from the lower stroke delay means while being eccentrically inserted into the main gear.
The method according to claim 1,
The lower stroke-stroke extending means includes a first link member having one side fixed to the crankshaft, a second link member having one side connected to the periphery of the main gear and the other side connected to the other side of the first link member And a knuckle press driving device having a lower stroke delay characteristic.
3. The method of claim 2,
Wherein the crankshaft is rotatably mounted on the frame by a first shaft support member into which one end is inserted and a second shaft support member into which the other end is inserted,
The main gear includes a support portion insertion hole formed at a center of a gear body having a gear portion formed on an outer circumferential surface thereof for inserting and fixing a first shaft support member therein and a power transmission pin for contacting the support portion insertion hole, A pin binding hole formed to be inserted and fixed is formed
Wherein the first shaft support member has a structure in which an eccentric hole into which the crankshaft is inserted is formed in a disk-shaped projection portion inserted into the support portion insertion hole, and is fastened and fixed to the main gear by a fixed flange. Knuckle press drive system with motion delay characteristics.
The method according to claim 1,
Wherein the link mechanism includes a drive link having one side connected to the connecting rod and a lift link having one side connected to the other side of the driving link and the other side connected to the slide,
An auxiliary drive shaft inserted into the drive link; And
And a power transmission gear disposed in the auxiliary drive shaft and disposed between the drive gear and the main gear.
5. The method of claim 4,
The drive shaft is disposed in front of and behind the frame, the flywheel is connected to the rear portion so that the power generating portion is disposed at a rear portion of the frame, and the drive gear is disposed on all of the power transmitting portion in a front portion of the frame ,
The power transmission gear portion includes a first power transmission gear installed on the auxiliary drive shaft and engaged with the drive gear, a second power transmission gear disposed on the auxiliary drive shaft in contact with the first power transmission gear, And a knuckle press driving device having a lower stroke delay characteristic.
6. The method according to any one of claims 1 to 5,
Wherein the crank pin of the crank shaft is constituted by a pair and the crank pin comprises the operating portion including the connecting rod and the link mechanism respectively.

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