KR100628530B1 - Supplying device of retainer for taper roller bearing - Google Patents

Abstract

The present invention relates to a retainer feeder for tapered roller bearings for transferring a retainer semifinished product for tapered roller bearings housed in a hopper to a transfer conveyor belt using alternately arranged fixed lifting plates and reciprocating lifting plates.

Retainer supply device 21 of the present invention is a hopper (3) for supplying the retainer semi-finished product (R), a support frame (26) installed inside the hopper (3), one or more fixed to the support frame (26) One or more reciprocating lifting plates 22 and 24 reciprocating up and down between the lifting plates 30 and 23, the stationary lifting plates 23 and 30, and a rear surface of the reciprocating lifting plates 22 and 24. It characterized in that it comprises a drive means (40).

Therefore, according to the retainer supply apparatus of the present invention, it is possible to reduce the damage caused by misplaced semi-finished products by increasing its misplaced semi-finished product sorting ability, and to prevent the delay of transfer of semi-finished products due to the sorting operation.

Tapered Roller Bearings, Retainers, Semi-finished Products, Feeders

Description

Retainer feeder for tapered roller bearings {Supplying device of retainer for taper roller bearing}

1 is a longitudinal sectional view of a typical tapered roller bearing.

FIG. 2 is a perspective view of the retainer for tapered roller bearing shown in FIG. 1. FIG.

Figure 3 is a block diagram schematically showing a retainer manufacturing apparatus for a conventional tapered roller bearing having a plurality of side punching machine.

Figure 4 is a perspective view showing a retainer semi-finished lifting belt applied to the conventional retainer manufacturing apparatus for a tapered roller bearing shown in FIG.

Figure 5 is a block diagram schematically showing a retainer manufacturing apparatus for a tapered roller bearing to which the feeder of the present invention is applied.

6 is a front view of the retainer supply apparatus according to the present invention.

7 is a plan view of the retainer supply device shown in FIG.

8 is a perspective view of the retainer supply device shown in FIG.

9A and 9B are schematic views showing main parts explaining the operating states of the reciprocating and fixed lifting plate of the retainer supply device shown in FIGS.

10a and b are a partially enlarged perspective view of the branching device applied to the retainer supply device of the present invention.

11A and B are schematic views illustrating the operation of conveying retainer semi-finished goods arranged by the reciprocating and fixed lifting plate of the feeder shown in FIGS. 9A and 9B.

12A and 12B are schematic views illustrating the operation of dropping retainer semi-finished products misplaced by the reciprocating and fixed lifting plate of the feeder shown in Figs. 11A and 11B.

Explanation of symbols on the main parts of the drawings

1: retainer manufacturing apparatus 3: hopper

5,6 side punching machine 7: chamfering machine

9: bottom punching machine 10,10 ': conveyor belt

11: branch device 13: positioning device

21: supply device 22, 24: reciprocating lifting plate

23,30: fixed lifting plate 26: support frame

27: inclined chute 31: overlapping selector

32: reverse sorting port 40: driving means

R: Semi-Retained Semi-Finished Product R ': Semi-Retained Semi-Finished Product

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying parts such as a retainer of a tapered roller bearing, and more particularly, a conveyer belt using a fixed lifting plate and a reciprocating lifting plate in which a retainer semi-finished product for a tapered roller bearing housed in a hopper is alternately arranged. It relates to a retainer feeder for tapered roller bearings to be transmitted to.

Generally, bearings can be roughly classified into sliding bearings, ball bearings, and roller bearings. Among these, roller bearings, which are widely used when the rotational speed is relatively low, the supporting load is large, and a strong impact is applied, are again used as cylindrical roller bearings, tapered roller bearings, needle bearings, spherical roller bearings, etc. Can be distinguished.

Here, the tapered roller bearing, like the other bearings, has a basic configuration of the inner race 53, the outer race 55, the roller 57, the retainer 59, as shown by reference numeral 51 in FIG. In particular, the retainer 59 allows the roller 57 to be evenly disposed on the entire circumferential surface between the inner and outer races 53 and 55, thereby preventing contact between the rollers 57 and thus generating wear or noise. Serves to prevent. Accordingly, the retainer 59 has a plurality of rectangular grooves 63 along which the roller 57 is rotatably fitted to the side wall of the inclined annular body 61 having a truncated cone shape as shown in FIG. 2. It is processed.

In order to manufacture the retainer 59 configured as described above, a retainer manufacturing apparatus 101 for a tapered roller bearing shown in FIG. 3 has been proposed. The apparatus 101 has a feed hopper 103 for supplying a prefabricated cup-shaped retainer semifinished product to the apparatus 101, and a roller 57 is fitted to the side wall of the semifinished product supplied from the hopper 103. A plurality of side punching machines 105 for shearing the rectangular grooves 63 to lose, a chamfer 107 for chamfering the inner edge 65 of the longitudinal rim of the rectangular grooves 63, and a chamfer The bottom surface punching machine 109 for cutting and removing the bottom surface of the finished cup-shaped semifinished product 51. Further, a branching device 111 is placed on the conveyor belt 110 between the hopper 103 and the plurality of side punching machines 105 and 106, and a positioning device lifting device 121 is disposed between the side punching machines 105 and 106 and the chamfering machine 107. ) Are installed respectively.

Therefore, according to this taper roller bearing retainer manufacturing apparatus 101, the retainer 59 is manufactured through the following process. First, the retainer semifinished product, which has been previously drawn into a cup shape, is supplied to the apparatus 101 through the hopper 103. Semi-finished products discharged from the hopper 103 is alternately transported to the plurality of side punching machine 105 by the conveyor belt (110). The conveyed semifinished product is sheared by a plurality of rectangular grooves 63 into which the rollers 57 are fitted on the side walls of the inclined body 61 by the side punching machine 105. The semifinished product is then positioned again in the positioning device lifting device 121 and transferred to the chamfering machine 107 so as to damage the roller 57 of the sharp edge portion of the rectangular groove 63. 65 is chamfered and removed. Finally, the semi-finished product transferred to the bottom punching machine 109 is cut off and removed the entire bottom portion of the main body 61 by the punching machine 109 to become an inclined annular finished product.

By the way, the retainer manufacturing apparatus 101 as described above is a device for injecting the retainer semi-finished product (R) on the transfer line 110 from the hopper 103 to the side punching machine 105 as shown in Figure 4 so far. Type of lifting device 121 has been used. As shown, the lifting device 121 is a lifting belt 123 arranged up and down from the bottom of the hopper 103 to the conveyor belt 110, and a belt pulley for moving the lifting belt 123 up and down ( 124, a plurality of lifting hooks 125 at regular intervals on the surface of the lifting belt 123 so that the semi-finished product (R) that slides into the bone along the inclined surface 104 of the hopper 103 is caught up. ) Is protruding. And in order to prevent the semi-finished product (R) coming up to the lifting hook 125 is rolled up on the lifting hook 125 during the ascension, the separation prevention plate 127 is mounted on both sides. .

Therefore, when the lifting device 121 is operated and the belt pulley 124 is rotated, the lifting belt 123 moves in the direction of the arrow A, and thus the lifting hook 125 is located at the bottom of the belt 113. One or more semi-finished products (R) are randomly caught up. As such, the semi-finished product R caught up by the lifting hook 125 is slid over the conveyor belt 110 as the belt 113 is wound around the belt pulley 124, and then moved along the belt 110. It is moved in the direction B) and is passed to the side punching machine (105, 106) via the branching device (111).

At this time, the semi-finished product (R) must be arranged in a state in which the top and bottom are reversed in the state in which the top side is inverted on the conveyor belt 110 for the windowing process by the side punch (105, 106) which is the next process. However, the conventional retainer semifinished lifting device 121 shown in FIG. 4 is a state in which the semifinished product R is placed on the lifting hook 125 as long as it is overlapped with each other, or is in the state of being laid down on the surface of the belt 113 as shown. The semi-finished product (R) transferred onto the conveyor belt 110 has a 50% chance of being shown in FIG. 2 because it is lifted up regardless of whether it is upside down, that is, whether the small diameter end is in contact with the belt 113 face or not. There was a problem in that the inverted state is reversed or transferred to a misplaced state in which two or more overlap.

Therefore, the semi-arranged semi-finished product (R) must be separated or laid down so as to be properly arranged by hand, and it is difficult to continue processing the semi-finished product (R) unless it is returned to the hopper 103 using a separate sorting device. . Furthermore, even if the sorting device is placed, the semi-finished product R which is misplaced among the semi-finished products R conveyed on the conveyor belt 110 is so large that it is almost half the semi-finished product R which is placed in the batch. There is a problem in that the transfer of semi-finished products is delayed, eventually causing a delay in the entire manufacturing process, there is a problem to lower the work productivity.

The present invention has been proposed to solve the problems of the conventional retainer manufacturing apparatus for tapered roller bearings as described above, and in the implementation of the automated transfer of retainer semi-finished products throughout the manufacturing line, the retainer semi-finished product from the feed hopper to the conveyer belt The retainer semi-finished product conveyed by the conveyor belt is given to the retainer supply device itself which delivers the function to sort the misplaced semi-finished products and the sorted misplaced semi-finished products by the sorting device installed downstream of the conveyor belt. The aim is to increase the rate of batch placement of the semi-finished products, thereby preventing delays in the transfer of semi-finished products and ultimately improving the production efficiency of retainers.

Therefore, in order to achieve the above object, the present invention provides a hopper for supplying a retainer semifinished product, a support frame installed inside the hopper, one or more fixed lifting plates mounted on the support frame, and reciprocating up and down between the fixed lifting plates. Provided is a retainer supply for a tapered roller bearing comprising one or more reciprocating lifting plates that are in motion, and drive means 40 coupled to the rear surfaces of the reciprocating lifting plates 22, 24.

Hereinafter, an embodiment of a retainer supply device for a tapered roller bearing according to the present invention will be described with reference to the accompanying drawings.

The retainer manufacturing apparatus to which the retainer supplying apparatus of the present invention is applied is configured similarly to the conventional retainer manufacturing apparatus, as shown by reference numeral 1 in FIG. 5.

The hopper 3 of the retainer supply device 21 according to the present invention is a side punching machine 5, 6 of the retainer manufacturing device 1 in which the retainer semi-finished product R, which has been previously drawn into a cup shape, is connected to the branch device 11. It is a part to be sequentially supplied in the form of a large funnel to accommodate a number of semi-finished products (R), is connected to the branch device 11 through a conveyor belt (10) starting from the top of the hopper (3) have.

The plurality of side punchers 5, 6 are connected in parallel to the hopper 3 via a branching device 11, and thus semifinished products R fed from the hopper 3 through the conveyor belts 10, 10 ′. The rectangular grooves 63 shown in Fig. 2 are punched out on the sidewalls thereof.

In addition, the chamfering machine 7, which is connected to the plurality of side punching machines 5, 6 via the positioning device 13, is discharged from each side punching machine 5, 6, and alternately by the positioning device 13. The roller 57 fitted into the rectangular groove 63 of the finished retainer 59 by chamfering the inner end edge 65 of the longitudinal rim portion of the rectangular groove 63 processed on the side wall of the semi-finished product R loaded. Is prevented from being damaged by this edge 65.

Finally, the bottom punching machine 9 is installed downstream of the chamfering machine 7 to cut the bottom surface of the semi-finished product R where the edge portion chamfering molding of the rectangular groove 63 is finished by punching to retain the retainer 59. ) To complete.

In particular, the retainer supply apparatus according to the present invention has a hopper 3, a support frame 26, lifting plates 22, 23, 24.30, and lifting plate driving means, as shown by reference numeral 21 in FIGS. 6 to 8. It consists of 40.

Here, the hopper 3 serves to receive a supply object such as the semi-finished product (R), the support frame 26 is installed in the bottom portion where the inclined surface of the inside of the hopper 3 gathers, the retainer accommodated in the hopper (3) The semi-finished product R can be smoothly raised upward by the reciprocating lifting plate 24. In addition, the anti-drop plate 25 is installed adjacent to the upper side of the support frame 26 along the side of the conveyor belt 10 to prevent the semi-finished product R delivered to the belt 10 from rolling down the belt 10. It is supposed to be. The one or more fixed lifting plates 30 and 23 and the reciprocating lifting plates 22 and 24 arranged in front of the support frame 26 are arranged stepwise to convey a plurality of semi-finished products R contained in the hopper 3 on the conveyor belt. As an integral part of the feeding device 21 for moving to 10, the stationary lifting plates 30 and 23 fixed to the support frame 26 and the stationary lifting plates 30 and 23 by the driving means 40 are provided. The reciprocating lifting plates 22 and 24 which reciprocate up and down therebetween are slidably stacked with respect to each other in an inclined state.

The driving means 40 coupled to the rear surface of the reciprocating lifting plates 22 and 24 so as to cause the up and down reciprocating motion of the reciprocating lifting plates 22 and 24 is as shown in FIGS. 9A and 9B. The rotational motion is converted into the linear motion of the linkage assemblies 36, 37, 38, and 39 to reciprocate the reciprocating lifting plates 22, 24 up and down. (36,37,38,39). Here, the drive motor 33 generates the rotational driving force to rotate the reducer 35. The reducer 35 operated by the motor 33 has a pair of rotary arms 36 and 38 connected to both ends of the shaft, and a pair of connecting rods 37 and the other end of the rotary arms 36 and 38. 39 are linked respectively. The other ends of the connecting rods 37 and 39 are pivotally coupled to the bottom of the rear surfaces of the reciprocating lifting plates 22 and 24, and although not shown, the connecting rods are connected to the rear of the reciprocating lifting plates 22 and 24. Guides for smoothly moving up and down the reciprocating lifting plates 22 and 24 by 37 and 39 may be installed.

The drive means 40 may be implemented in such a way as to reciprocate the lifting plate (22, 24) by a cylinder (not shown).

In order to transfer the semi-finished product R contained in the hopper 3 to the conveyor belt 10 by using the stepped stacking fixed lifting plates 30 and 23 and the reciprocating lifting plates 22 and 24, The upper edge surface of each plate 30, 23, 22, 24 should have a width enough to raise the semi-finished product (R). In particular, the stationary lifting plate 23 and the reciprocating lifting plates 22 and 24 of the retainer supply apparatus 21 according to the present invention are positioned at the top, that is, the stationary lifting plate (which is located at the height of the conveyor belt 10 or more) All but the upper edge face of 30) is preferably inclined to be at an acute angle with the plane of neighboring plates 30, 23, 22, as shown in FIGS. 11A and 11B and 12A and 12B, which are fixed lifting plates. The semi-finished product (R) placed in the fixed state in which the large diameter end is in contact with the (30,23) plane is further consolidated, and the reversed semi-finished product is inverted so that the small diameter end is in contact with the fixed lifting plate (30,23) face. R ') feed is inhibited. Furthermore, if the inclination angle of the upper edge face of each plate 23, 22, 24 coincides with the inclination angle of the side wall face of the semifinished product R, the upper edge face and the semifinished side wall face are matched with each other when lifting the semifinished product R as shown. The transfer of the batched semifinished product R is made more secure.

In addition, the plates 22, 23, 24, except for the top fixed lifting plate 30, may optionally vary in thickness, for example as shown in FIGS. 11A and B and 12A and B, the reciprocating lifting plate 22 As described above, the thickness a may be set thinner than the height d of the semi-finished product R. This makes it possible to drop the inverted semifinished product R 'into the hopper 3 more easily as shown in FIG. 12B, and nevertheless does not interfere with the transport of the semifinished product R arranged as shown in FIG. 11B. This is not caused.

In addition, the retainer supply device 21 of the present invention, as shown in Figures 6 to 8 to further increase the dropout rate of the misplaced semi-finished product (R '), overlapping sorting opening 31 on the downstream side of the conveyor belt (10) ) And the reversal sorting opening 32 are installed, the handrail plate 29 to which the sorting openings 31 and 32 are attached is a semi-finished product (R, R ') being transferred on the conveyor belt (10) hopper (3) It prevents falling to the other side.

Here, the overlapping selection port 31 is a bar-shaped blocking means for dropping the semi-finished product (R) superimposed up and down as shown, the wall surface of the handrail plate 29 to a height lower than the height of the superimposed semi-finished product (R) Attached to and arranged in a direction crossing the conveyor belt 10 at an angle so that the overlapping semifinished product R caught by the sorting opening 31 can be guided in the direction of arrow B in FIG. In addition, the reversal sorting opening 32 is an inverted opening that is inverted upwardly, that is, a plate-like blocking means for dropping the inverted semifinished product R ', and is attached to the wall of the handrail 29 at the same height as the semifinished product R. It extends over the belt 10. At this time, between the end face of the reversal sorting opening 32 and the edge portion of the hopper 3 side of the conveyor belt 10, only the space D that is narrower than the large diameter radius of the inverted semifinished product R 'and larger than the small diameter radius is left. do. The sorting opening 32 is also in the direction in which the front edge crosses the conveyor belt 10 at an angle so as to push the inverted semi-finished product R 'with a large diameter end in the direction of the arrow C of FIG. It is inclined.

In addition, the overlapping or inverted semi-finished product dropped by these sorting openings 31 and 32 on the opposite side of the handrail plate 29 downstream of the conveyor belt 10 equipped with the overlapping sorting opening 31 and the inversion sorting opening 32. The inclined chute 27 for recovering (R, R ') is provided. As shown in Figs. 6 to 8, the inclined chute 27 has a wide inlet opening for the semi-finished product R adjacent to the belt 10, and a discharge opening for discharging the injected semifinished product R to the hopper 3 is narrow. The buffer plate 28 is obliquely placed on the side.

In addition, the retainer supply device 21 according to the present invention is provided with a branch device 11 as shown in Figs. 10A and 10B at a point where a plurality of transfer conveyor belts 10 and 10 'are divided into two. This branching device 11 is, as shown, a branch lever 43 mounted at the point where the branching conveyor belt 10 'is divided on the main conveyor belt 10 and a semifinished product at each belt 10' or 10. (R) is formed of a stack detection sensor (41, 42) for detecting the transfer stack, the branch lever 43 is rotated about the hinge pin (44) in accordance with the operation command from the control unit (not shown) semi-finished product (R ) Is to switch the feed path.

Now, the operation of the retainer supply apparatus 21 according to the present invention configured as described above is as follows.

The process of transferring the semi-finished product R accommodated in the hopper 3 by the retainer supply device 21 of the present invention applied to the retainer manufacturing apparatus 1 onto the conveyor belt 10 will be described below.

Once the retainer manufacturing apparatus 1 is started, the motor 33 is operated in the state shown in Fig. 9A, and the decelerator 35 is rotationally driven in the direction of the arrow A accordingly. As the reducer 35 rotates, a pair of arms 36 and 38 arranged in a straight line directly connected to the left and right ends of the rotating shaft also rotate in the same direction, so that the connecting rod 37 connected to the arm 36 is reciprocated. The lifting plate 22 is pushed up, and the arm 38 pulls the connecting rod 39 to likewise pull up the reciprocating lifting plate 24.

When the reciprocating lifting plate 24 rises as described above, a part of the semifinished product R, which is in contact with the fixed lifting plate 3, of the semifinished product R contained in the hopper 3 in the direction of the arrow A of FIG. 7. Move and climb over the top edge face of the reciprocating lifting plate 24 as shown in FIGS. 10A and 11A. At this time, not only the semi-finished product (R) but also inverted semi-finished product (R ') is hung up together. If the thickness (b) of the reciprocating lifting plate 24 is thinner than the semi-finished product height (d), it is misplaced from the beginning. The semi-finished product (R ') can be transported out, but in this case there is a fear that the number of transfer of semi-finished product (R) placed coordination is also reduced. In addition, as shown, when the edge surface and the semi-finished sidewalls are matched, it is difficult to separate the semi-finished product R arranged therein, so that external force such as a stronger vibration is removed for the transfer dropping of the inverted semi-finished product R '. ), So that the inverted semifinished product (R ') can be transported and dropped early, resulting in increased transport of the semi-finished product (R).

Subsequently, when the reciprocating lifting plate 24 is raised to reach the top dead center as shown in Fig. 9B, the semi-finished products R and R 'hanging on the top edge surface of the reciprocating lifting plate are self-weighted and the reciprocating lifting currently located at the top dead center. It is placed on the upper edge surface of the fixed lifting plate 23, with it lying upside down or inverted in the middle of the plane of the plate 22.

When the reducer 35 rotates in the direction of the arrow B in the state shown in FIG. 8B, the reciprocating lifting plates 22 and 24 are lowered again by the connecting rods 37 and 39 to be in the state of FIG. 8A. At this time, a new semi-finished product (R, R ') is placed randomly on the upper edge surface of the lower reciprocating lifting plate 24 as described above. On the other hand, the semi-finished products (R, R ') already placed on the upper edge surface of the fixed lifting plate 23 is placed on the upper edge surface of the reciprocating lifting plate (22).

When the reducer 35 rotates in the direction of the arrow A again in the state of FIG. 8A, the semi-finished products R and R 'lying on the upper edge surface of the upper reciprocating lifting plate 22 are as shown in FIGS. 10B and 11B. , Along the fixed lifting plate 30 is raised. At this time, if the thickness (a) of the reciprocating lifting plate 22 is thinner than the height (d) of the semi-finished products (R, R '), as shown, the semi-finished product (R) is still arranged, the top surface of the reciprocating lifting plate (22) While inclined to securely lifted to the end of the fixed lifting plate 30 is delivered to the conveyor belt 10, the inverted semi-finished product (R ') is easily released from the reciprocating lifting plate 22 even with a slight impact. Meanwhile, also in this case, the semi-finished products R and R are transferred onto the fixed lifting plate 23 by the lower reciprocating lifting plate 24.

As such, most misplaced semifinished products R 'are dropped before being transferred to the conveyor belt 10 by the feeder 21 of the present invention, and the remaining misplaced semifinished products R' are also superimposed and reversed. 31 and 32 are completely screened and returned to the hopper 3. That is, the superimposed semi-finished product (R) is raised to the arrow (B) of FIG. 7 by the superimposed sorting opening 31 crossing the conveyor belt 10 to a height that can pass only one semi-finished product (R). It is pushed out and dropped to the inclined chute 27, and the inverted semifinished product R 'is pushed out in the direction of the arrow C to the inversion sorting opening 32 narrowed to pass only the small diameter end.

The co-located semifinished product R thus left on the conveyor belt 10 meets the branching device 11 and branches to the main belt 10 or the branch belt 10 ', which is branched by the sensor 42. When the transfer accumulation is detected at the 10 'side, the branch lever 43 rotates to the position shown in FIG. 10A and transfers the semi-finished product R, which is conveyed, to the main belt 10, and is diverged by the sensor 41. When the transfer accumulation is sensed on the belt 10 'side, the branch lever 43 rotates to the position shown in FIG. 10B to transfer the semi-finished product to the branch belt 10'. If both sensors 41 and 43 detect the accumulation of semi-finished product R, the entire retainer manufacturing apparatus 1 is stopped.

Although the retainer supply device 21 of the present invention has been described in application to the retainer manufacturing apparatus for tapered roller bearings, the present invention is not limited thereto, and the retainer supply device 21 may be variously applied to a lifting device for transferring various types of components from below. Naturally, it can be applied.

Above, according to the retainer supply device for tapered roller bearings of the present invention, the retainer semi-finished product is transported step by step from the hopper to the conveying conveyor belt through the reciprocating and fixed lifting plate, so that the misplaced semi-finished product overlapped or reversed in the lifting step is effectively transported. You can drop out. In addition, misplaced semi-finished products that are not dropped in the lifting stage are also filtered out by overlapping and reversing sorting holes installed downstream of the feeder, so that all semi-finished products transferred to a process such as a windowing process by the conveyor belt are arranged in a regular manner. Damage to the semifinished product itself due to misplacement of the semifinished product or failure of other devices can be prevented in advance.

In addition, since most misplaced semi-finished products are already screened at the lifting stage, the misplacement rate of semi-finished products approaching the superimposed and reversed sorting outlets is markedly reduced, resulting in excessive selection amount in the overlapping and reverse sorting strips installed on the transfer line. Because of this, there is no fear of the transfer delay, so it can be expected to improve the transfer efficiency of semi-finished products, furthermore, the production efficiency of retainers.

Claims (7)

A hopper for supplying retainer semi-finished products, a support frame installed inside the hopper, at least one fixed lifting plate mounted on the support frame, at least one reciprocating lifting plate reciprocating up and down between the fixed lifting plates, and the reciprocating lifting plate Retainer supply device for a tapered roller bearing, characterized in that comprises a drive means coupled to the rear of the. 2. The retainer supply device of claim 1, wherein the one or more lifting plates other than the top fixed lifting plate are inclined such that the upper edge faces an acute angle with the plane of a neighboring lifting plate supporting the semifinished product together. The retainer supply device according to claim 1, wherein the one or more lifting plates other than the top fixed lifting plate are thinner than the height of the semi-finished product. The reciprocating lifting plate driving means according to claim 1, wherein the reciprocating lifting plate driving means is connected to a motor for generating a rotational driving force, a reducer for converting the rotational force of the motor into a linear motion of a pair of link assemblies, and the reciprocating lifting plate from the reducer, respectively. A retainer supply comprising a pair of linkage assemblies. According to claim 1, Retainer supplying device, characterized in that the railing plate wall surface of the conveyor belt is attached to the overlapping sorting device of the rod shape obliquely crossing the belt at a height lower than the overlapping semi-finished product to guide the overlapping semi-finished product toward the hopper. According to claim 1, wherein the handrail plate wall surface of the conveyor belt is inverted in the form of a plate-shaped inverted sorting device that crosses the belt at an angle narrower than the large diameter radius of the semi-finished product is turned upside down and wider than the small diameter radius. Retainer supply apparatus characterized in that attached. According to any one of claims 5 and 6, between the overlapping sorting device and / or the inverting sorting device and the plurality of side punching machine, a stack of semi-finished products transferred to the conveyor belt is sensed by a sensor to the branch lever. And a branching device for switching the semi-finished product conveyance direction to the opposite conveyor belt in which the semi-finished product is accumulated.

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