KR102492172B1 - Special screw tightening apparatus - Google Patents

Abstract

The present invention relates to a screw fastening device with a special shape and, more specifically, to a screw fastening device which supplies a short-length screw of a special shape, which has a shorter screw shaft than the diameter of a screw head, to a correct position, and automatically fastens the screw. The screw fastening device comprises: a base plate on which a driver unit for fastening a short-length screw to a target object is provided to move vertically; a supply block which is provided on the base plate to be inclined, and has a rail groove which guides and supplies the short-length screw to the fastening position of the driver unit; and a supply hose which is connected to the supply block, and has a supply groove which provides the short-length screw to the rail groove of the supply block by pneumatic pressure, wherein the rail groove of the supply block and the supply groove of the supply hose are formed to correspond to each other, and each of the rail groove and the supply groove includes a horizontal groove on which the screw head of the short-length screw is placed to be transported, and a vertical groove which extends downward from the horizontal groove and into which the screw shaft is inserted for transport. The upper surface of the horizontal groove is provided to cover at least a portion of or the entire horizontal groove so that the screw head of the transported short-length screw is caught when the short-length screw moves.

Description

Special type of screw tightening apparatus {Special screw tightening apparatus}

The present invention relates to a special type of screw fastening device, and more particularly, to a special type of screw fastening device capable of stably and automatically supplying and fastening a special type of short-length screw having a screw shaft length shorter than the diameter of the screw head. It is about.

In general, in a screw fastening operation, a worker uses a hand tool such as a wrench or a screwdriver or a power tool driven by a motor to fasten a screw to a fastening object, that is, an assembly product.

Since this type of screw fastening operation actually requires a large number of skilled workers, it acts as a factor in increasing the manufacturing cost, and the delay time is too long in the process of fastening multiple screws at the same time due to the limitation in the working speed. do.

In particular, in the case of electronic products, since electronic products become thinner due to miniaturization and slimming, when assembling these electronic products, each part is coupled to each other using special-shaped screws and the case is fixed.

These special-shaped screws are special-shaped screws (hereinafter collectively referred to as “short-length screws”) whose shaft length is shorter than the diameter of the screw head, and are used in all industries, including electronic products, medical devices, automobile parts, and household goods. Due to the slimming of the product, the frequency of use is increasing widely in all fields.

In fastening a special type of screw whose shaft length is shorter than the diameter of the screw head, that is, a short-length screw, when a worker manually tightens the screw, it is not easy to fasten, which can cause defects. If you put your heart and soul into it, not only does the work progress slowly, but it also takes a long time to work due to the slow work, which leads to a decrease in productivity.

Thus, in order to eliminate the inconvenience caused by manual work in screw fastening, conventionally, a main body having a holder to which an object is fixed on one side, a feeder provided on one side of the main body to align and supply screws one by one, and provided in the main body A screw fastening machine including a driver unit that picks up screws supplied by a feeder and couples them to an object fixed to a holder, and a transfer means that is connected to the driver unit and adjusts the position of the driver unit has been proposed.

However, the conventional screw fastener is inefficient due to the inconvenience that the driver unit picks up the screw supplied by the feeder, fastens it to the object, and then moves to the feeder side to pick up another screw.

Therefore, in order to compensate for the above-mentioned disadvantages, screw fastening in which the screw is put into the supply hose by air pressure, transported and supplied to the screw fastening position, and the driver unit picks up the screw supplied to the screw fastening position and fastens it to the object. Gi has been proposed.

However, such a supply hose supplies the screw with air pressure acting inside it, but a special type of screw whose screw shaft is shorter than the diameter of the screw head, that is, a short length screw, has its center of gravity biased toward the screw head. Since it is rotated in the supply hose by air pressure, it is supplied while being rotated in the supply hose, so it cannot be provided in the correct position at the fastening position, and it is inefficient because the operator has to position the short length screw that is not in the correct position, and the problem of reduced productivity is also There are flaws that have not been addressed at all.

Republic of Korea Patent No. 10-0581697 Republic of Korea Patent Registration No. 10-1613296

Therefore, the present invention has been made to solve the problems of the prior art as described above, so that a special type of short-length screw having a screw shaft length shorter than the diameter of the screw head can be stably and automatically supplied so that rapid automatic fastening can be achieved. Its purpose is to provide a special type of screw fastening device.

A special type of screw fastening device according to the present invention for achieving the above object is a screw fastening device that automatically fastens by supplying a special type of short-length screw with a screw shaft shorter than the diameter of the screw head to the correct position. A base plate on which a driver unit for fastening a screw to an object is moved up and down; A supply block provided at an angle to the base plate and having a rail groove for guiding and supplying a short-length screw to a fastening position of a driver unit; A supply hose connected to the supply block and having a supply groove for supplying a short-length screw to the rail groove of the supply block by air pressure; including, the rail groove of the supply block and the supply groove of the supply hose are formed in a shape corresponding to each other, while The rail groove and the supply groove include a horizontal groove in which the screw head of a short-length screw is seated and transported, and a vertical groove extending downward from the horizontal groove and transported with the screw shaft inserted therein, and the upper surface of the horizontal groove is transported. It is characterized by a screw fastening device provided to cover part or all of the horizontal groove so that the screw head is caught when the short length screw is flowed.

And, it is provided to be fixed to the base plate and provided with a short length screw supplied by the supply block at its central portion, while the driver unit penetrates the center block through which a fastening portion is formed through which the driver unit is lowered while being coupled to the short length screw; A jig block that is hinged to both sides of the center block, where the short-length screws drawn out from the supply block are seated and positioned while being rotated by a driver unit that descends and then returns to its original position.

In addition, the jig block includes a vertical block hinged to the center block, and a horizontal block extending from the vertical block to the other jig block, and both horizontal blocks have stepped portions formed at adjacent ends, and A short-length screw may be inserted between the two horizontal blocks to form a jig groove in which the screw head is seated.

In addition, a curved surface gently recessed toward the jig groove may be formed on the upper surface of both horizontal blocks so as to smoothly guide the short-length screw into the jig groove.

In addition, side blocks fixed to both base plates spaced apart from the center block may be provided, and a return spring for returning the rotated jig block to its original position may be provided between the side block and the jig block.

According to the special type of screw fastening device of the present invention, a special type of short length screw having a screw shaft length shorter than the diameter of the screw head is automatically supplied to the screw fastening position, and the fixed short length screw is positioned at the screw fastening position. Since it can quickly and automatically fasten, there is an effect of improving workability and productivity of screw fastening.

1 is an overall configuration diagram of a screw fastening device according to the present invention.
2 is a block diagram of a screw supply device included in a screw fastening device according to the present invention.
Figure 3 is a separated view of the jig unit constituted in the screw supply device according to the present invention.
Figure 4 is a configuration diagram of a supply block constituted in the screw supply device according to the present invention.
5 is a cross-sectional configuration diagram of a screw supply device according to the present invention.
6 is an operation diagram showing a supply process of screws supplied to the jig block side through the supply block of the screw supply device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms used in the present invention are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator, so the definitions of these terms are meanings consistent with the technical details of the present invention. and should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are only exemplary of the components presented in the claims of the present invention, are included in the technical spirit throughout the specification of the present invention, and cover the scope of the claims. It is an embodiment including components that can be replaced as equivalents in components.

In addition, optional terms in the following embodiments are used to distinguish one element from other elements, and elements are not limited by the terms.

Therefore, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

1 to 6 are drawings showing a special type of screw fastening device and each component thereof according to the present invention.

As shown in the drawing, the screw fastening device 10 according to the present invention is a special type screw having a screw shaft 1b shorter than the diameter of the screw head 1a, that is, a short screw 1 to an object to be fastened. It is a device for automatic fastening.

The screw fastening device 10 includes a screw supply device 100 for supplying the short-length screw 1 to the fastening position, that is, to the fastening part 130a made of space, in a fixed position.

First, the short length screw 1 described in the present invention is a special type of screw in which the length of the screw shaft 1b is shorter than the diameter of the screw head 1a, hereinafter referred to as the short length screw 1.

And, as shown in FIG. 1, the screw fastening device 10 includes a base plate 11 fixedly installed on a base (not shown) and a driver unit 20 provided to move up and down on the base plate 11 includes

The base plate 11 has a "b" shape, and includes a vertical plate 11a erected vertically upward and a horizontal plate 11b protruding forward from a lower portion of the vertical plate 11a.

In particular, a lifting unit 40 for moving the driver unit 20 up and down is fixedly provided on the vertical plate 11a, and the lifting unit 40 may be composed of a motor, a screw shaft, or a cylinder.

In addition, the driver unit 20 includes a rotary motor 30 provided to be moved up and down in front of the vertical plate 11a by the lifting unit 40, and a lifting unit 40 provided below the rotary motor 30 While moving up and down like the rotary motor 30 by the suction tube 22 for adsorbing the short-length screw 1 therein by the suction force by the vacuum pressure acting therein, and the chuck of the rotary motor 30 (31) includes a driver bit 21 that is fixed to the suction pipe 22 and automatically fastens the short-length screw 1 adsorbed to the suction pipe 22 to the fastening object while moving in and out of the suction pipe 22.

In particular, the rotary motor 30, the driver bit 21, and the suction pipe 22 are lifted together by the lifting unit 40, but the rotary motor 30 and the driver bit 21 even after the suction pipe 22 is stopped. ) is provided with a structure in which the driver bit 21 passes through the suction pipe 22 and can be further descended. For example, the rotary motor 30, the driver bit 21, and the suction tube 22 may be configured with the same structure as the automatic screw fastening device disclosed in Korean Patent Registration No. 10-2341618 registered by the present applicant, , a detailed description thereof is omitted.

As a result, the rotation motor 30, the driver bit 21, and the suction tube 22 are simultaneously lowered by the lifting unit 40, and the suction tube 22 is attached to the short length screw 1 on the jig block 150 to be described later. is absorbed and inserted into the inner lower part, and in this state, the suction pipe 22 is lowered until it comes into contact with the fastening object, and then the driver bit 21 provided in the suction pipe 22 is lowered to the lower part of the suction pipe 22. While being moved to the suction pipe 22, it protrudes to the lower end of the suction pipe 22 in a state of being coupled to the screw head 1a of the short-length screw 1 adsorbed on the suction pipe 22, and the protruding driver bit 21 rotates the motor As it is rotated by (30), the short length screw (1) is automatically fastened to the fastening object.

As shown in FIGS. 2 and 3, the screw supply device 100 constituted in the screw fastening device 10 is inclined on the base plate 11 to insert the short-length screw 1 into the fastening position of the driver unit 20. A supply block 110 having a rail groove 111 that guides and supplies, and is connected to the supply block 110 and supplies a short length screw 1 to the rail groove 111 of the supply block 110 with pneumatic pressure. It includes a supply hose 112 having a supply groove 113.

In addition, the rail groove 111 of the supply block 110 and the supply groove 113 of the supply hose 112 are formed in a mutually corresponding shape, and the rail groove 111 and the supply groove 113 are short-length screws. The horizontal grooves 111a and 113a in which the screw head 1a of (1) is seated and transported and the horizontal grooves 111a and 113a extending downward from the horizontal grooves 111a and 113a are transported with the screw shaft 1b inserted therein. It includes vertical grooves 111b and 113b, and the upper surfaces of the horizontal grooves 111a and 113a are horizontal grooves 111a and 113a so that the screw head 1a is caught when the short-length screw 1 is moved. It is provided to cover part or all of the

In particular, the supply block 110 is provided obliquely while passing through the vertical plate 11a and the horizontal plate 11b of the base plate 11, and the supply block 110 is coupled and fixed to the rear surface of the vertical plate 11a. It is fixed in an inclined state by the mounting block 120 to be.

As shown in FIG. 4, inside the supply block 110, a "T" shaped rail groove 111 is formed along the longitudinal direction, and the rail groove 111 is formed by the upper horizontal groove 111a and the horizontal groove. (111a) includes a vertical groove (111b) extending downward.

As a result, the screw head 1a of the short length screw 1 is seated in the horizontal groove 111a of the rail groove 111, and the short length screw ( The screw shaft 1b of 1) is transferred in an inserted state.

In addition, a supply hose 112 is connected to the rear of the supply block 110, and air pressure acts on the supply hose 112 to drive the short screw 1 into the rail groove 111 of the supply block 110. will be delivered and supplied.

The supply hose 112 has a "T" shaped supply groove 113 identical to the rail groove 111 of the supply block 110 formed therein in the longitudinal direction of the supply hose 112, and the supply groove ( 113) Also, the horizontal groove 113a positioned at the same position as the horizontal groove 111a of the rail groove 111 and in communication, and the vertical groove 111b of the rail groove 111 extending downward from the horizontal groove 113a It includes a vertical groove (113b) positioned at the same position as and communicated with.

In particular, the horizontal grooves 111a and 113a of the rail groove 111 and the supply groove 113 are caught by the screw head 1a when the short length screw 1 to which the upper surface is transported moves, so that the short length screw ( 1) may be provided with a part or all of the upper surface of the horizontal groove (111a) covered so as to prevent rotation and consequent departure.

At this time, in this embodiment, as an example of the latter case, the state in which the upper surfaces of the horizontal grooves 111a and 113a are closed is illustrated, but in addition to the former, the upper surfaces of the horizontal grooves 111a and 113a are open. In the upper surface of the horizontal grooves (111a) (113a) on one side or both sides of the screw head (1a) of the short length screw (1) may be protruding to a certain length protruded to be engaged may be formed.

In addition, the vertical grooves 111b and 113b of the rail groove 111 and the supply groove 113 are formed with their lower ends penetrating the lower surfaces of the supply block 110 and the supply hose 112, which is It is to be able to repair the short length screw 1 separated from the rail groove 111 of the block 110 and the supply groove 113 of the supply hose 112.

In addition, the screw fastening device 10 as described above is provided to be fixed to the base plate 11, and a short-length screw 1 drawn out from the supply block 110 is supplied and positioned at the center thereof, while the driver unit 20 The center block 130 through which the fastening part 130a moved while being coupled to the short length screw 1 penetrates and is hinged to both sides of the center block 130 and is drawn out from the supply block 110 A jig block 150 is included in which the short-length screw 1 is seated and positioned, while being rotated by the driver unit 20 to be lowered and opened and then returned to its original position.

In particular, a central center block 130 and side blocks 140 on both sides are fixed to the lower surface of the horizontal plate 11b of the base plate 11, respectively.

As shown in FIG. 3, the center block 130 is provided to be fixed to the center of the lower surface of the horizontal plate 11b, and the center of the center block 130 penetrates in the front and rear directions and the jig block 150 to be described later is located at the center of the center block 130. A fastening portion 130a (fastening position) is formed.

In addition, on both outer surfaces of the center block 130, a mounting groove 131 is formed in which the vertical block 150a of the jig block 150 to be described later is inserted and hinged, and the lower portion of the mounting groove 131 is center It is formed through the lower surface of the block 130.

In addition, a through-hole through which the driver bit 21 of the driver unit 20 and the suction pipe 22 pass through is formed at the center of the upper surface of the center block 130 to enter and exit vertically.

On the other hand, the side block 140 is provided to be fixed to both sides of the lower surface of the horizontal plate 11b facing both sides of the center block 130, and a return spring to be described later on the inner side facing the center block 130 ( 160) is formed into the insertion groove 141 is inserted.

In addition, a jig block 150 is hingedly provided to the mounting grooves 131 on both sides of the center block 130 as described above.

The jig block 150 is a vertical block 150a that is inserted into the mounting groove 131 of the center block 130 and hinged, and a horizontal block that protrudes from the vertical block 150a toward the relative jig block 150. Block 150b is included.

As shown in FIGS. 3 and 5, the vertical block 150a of the jig block 150 is inserted into the mounting groove 131 from the outside of the center block 130, and the horizontal block 150b of the jig block 150 ) is provided to bypass the lower surface of the center block 130 and protrude toward the relative jig block 150.

In particular, when the jig block 150 is rotated in the mounting groove 131 of the center block 130 at the inner corner of the upper end of the vertical block 150a, the inner corner of the upper end of the vertical block 150a is inside the mounting groove 131. An inclined surface 152 is formed to prevent interference by being caught on the side in advance. By the inclined surface 152 formed in this way, the jig block 150 can be freely rotated in the mounting groove 131 of the center block 130 without interfering with the inner surface of the mounting groove 131 .

In addition, an insertion groove 153 corresponding to the insertion groove 141 of the side block 140 is formed on the outer surface of the vertical block 150a, and the rotated jig block 150 is formed in both insertion grooves 141 and 153. ) is provided with a return spring 160 that returns to its original position.

Although this return spring 160 may be provided as a torsion spring, in this embodiment, the one provided as a compression coil spring will be described as an example, and both ends of the return spring 160 are inserted into the side blocks 140, respectively. It is inserted into the groove 141 and the insertion groove 153 of the vertical block 150a to elastically support the jig block 150 with its elastic force (tensile force).

On the other hand, the horizontal block 150b of the jig block 150 elastically supported by the return spring 160 has its upper surface in contact with both lower surfaces of the center block 130, respectively. At this time, the lower surface of the center block 130 serves as a stopper to stop the rotation of the jig block 150.

The horizontal blocks 150b of these two jig blocks 150 are positioned in a direction facing each other to form one flat plate, and both horizontal blocks 150b are located on the inside of the adjacent end (supply block) as shown in FIGS. 5 and 6 (110 side), a stepped portion 155 is formed, and a short-length screw 1 transferred from the supply block 110 is inserted between both horizontal blocks 150b by both stepped portions 155. Thus, a jig groove 156 of a space in which the screw head 1a can be seated is formed.

Such a jig groove 156 is formed in a "∪" shape with its opening positioned toward the supply block 110, while the width of the jig groove 156 is the screw head 1a of the short-length screw 1 Since it is smaller than the screw shaft 1b and has a larger width than the outer diameter of the screw shaft 1b, the short length screw 1 drawn out from the inclined supply block 110 is automatically inserted into the jig groove 156 and provided.

In addition, on the upper surface of both horizontal blocks 150b, as shown in FIGS. 5 and 6, a curved surface 154 gently recessed toward the jig groove 156 is formed, and a short length screw into the jig groove 156 ( 1) can be smoothly induced.

In particular, the curved surface 154 of both horizontal blocks 150b gently moves towards the inner end of the stepped portion 155 so that the inner end of the jig groove 156, that is, the inner end of the stepped portion 155 is provided at the lowest position. Since it is rounded and depressed, the inner end of the jig groove 156 is provided at the lowest position on the upper surface of the horizontal block 150b by the curved surface 154.

Therefore, the short length screw 1 drawn out from the rail groove 111 of the inclined supply block 110 not only naturally enters the jig groove 156, but also its screw head 1a is on the upper surface of the jig groove 156. Since it is stably seated and positioned, it is possible to provide the short length screw 1 to the inner end of the jig groove 156 in place.

In addition to this, the open upper surface of the jig groove 156 is positioned at a height corresponding to the bottom surface of the horizontal groove 111a of the rail groove 111, thereby withdrawing from the rail groove 111 of the inclined supply block 110. When the short-length screw 1 is inserted into the jig groove 156, it can be quickly inserted and seated in a state in which the flow is minimized.

The operation of the special type of screw fastening device according to the present invention as described above will be described.

First, the short length screw 1 is pressurized and transported to the "T" shaped supply groove 113 by the air pressure acting on the supply hose 112 of the screw supply device 100, and the supply groove 113 The short length screw 1 through is inserted into the "T" shaped rail groove 111 formed in the supply block 110 and transported.

At this time, the short length screw 1 transported and supplied from the rail groove 111 and the supply groove 113 has its screw head 1a in the rail groove 111 and the horizontal groove 111a of the supply groove 113 ( 113a), and the screw shaft 1b is transferred while being inserted into vertical grooves 111b and 113b formed to communicate downwardly from the horizontal grooves 111a and 113a.

In particular, even if the short length screw 1 flows in the rail groove 111 and the supply groove 113 during the supply process by transfer, the screw head 1a is caught on the upper surface of the horizontal grooves 111a and 113a, Since it is guided, its rotation and separation are prevented, so that stable supply is achieved.

In addition, the short-length screws 1 supplied as described above are automatically transported by the inclination of the supply block 110, and the short-length screws 1 to be transported are attached to the center block 130 as shown in FIGS. 5 and 6 It is drawn out into the jig groove 156 by both jig blocks 150 rotatably coupled thereto and is provided.

At this time, the jig groove 156 has its opening positioned toward the supply block 110 and is provided at the lowest position by the gently rounded curved surface 154 on the upper surface of the horizontal block 150b, so a short length screw With the screw head 1a of (1) seated on the curved surface 154 on the upper surface of the jig groove 156, the short-length screw 1 is automatically inserted into the inner end of the jig groove 156 and placed in place.

In this way, after the short-length screw 1 is properly positioned in the jig groove 156, the driver unit 20 of the screw fastening device 10 is operated.

That is, since the driver unit 20 is lowered by the lifting unit 40 and the suction force by the vacuum pressure is applied to the suction pipe 22 of the lowered driver unit 20, the suction pipe 22 is moved to the jig groove ( 156) At the same time as contacting the curved surface 154 of the upper surface, the short length screw 1 on the jig groove 156 is adsorbed and inserted into the suction pipe 22.

In this state, the driver unit 20 descends while rotating both jig blocks 150 downward with the hinge 151 as an axis, and the descending driver unit 20 makes the suction pipe 22 contact the upper surface of the fastening object will be done until

Then, even when the suction pipe 22 is stopped, the driver bit 21 in the suction pipe 22 is further lowered by the lifting unit 40 and coupled to the short screw 1, and the short screw 1 The coupled driver bit 21 is rotated in the suction pipe 22 by the rotary motor 30 to automatically fasten the short-length screw 1 to the fastening object.

And, after the short-length screw 1 is automatically fastened, the driver unit 20 is raised by the lifting unit 40 and returned to the original position, so that both jig blocks 150 rotated downward are compressed and returned from the rear. The jig block 150 rotates upward and reversely by the tensile force of the spring 160 until its horizontal block 150b comes into contact with the lower surface of the center block 130.

Therefore, the screw supply device 100 as described above can accurately and automatically supply the short length screw 1 to the jig groove 156 of the jig block 150 while minimizing the malfunction, so that the screw supply and screw fastening work can be performed. This can be done quickly to improve workability and productivity.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It is clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: short length screw 1a: screw head
1b: screw shaft 10: screw fastening device
11: base plate 11a: vertical plate
11b: horizontal plate 20: driver unit
21: driver bit 22: suction pipe
30: rotation motor 31: chuck
40: lifting unit 100: screw supply device
110: supply block 111: rail home
111a: horizontal groove 111b: vertical groove
112: supply hose 113: supply groove
113a: horizontal groove 113b: vertical groove
120: mounting block 130: center block
130a: fastening part 131: mounting groove
140: side block 141: insertion groove
150: jig block 150a: vertical block
150b: horizontal block 151: hinge
152: inclined surface 153: insertion groove
154: curved surface 155: stepped portion
156: jig home 160: return spring

Claims (5)

A screw fastening device that automatically fastens by supplying a special type of short-length screw with a screw shaft shorter than the diameter of the screw head to the correct position,
A base plate in which a driver unit for fastening a short-length screw to an object is moved up and down; A supply block provided at an angle to the base plate and having a rail groove for guiding and supplying a short-length screw to a fastening position of a driver unit; A supply hose connected to the supply block and having a supply groove for supplying the short-length screw to the rail groove of the supply block by air pressure;
The rail groove of the supply block and the supply groove of the supply hose are formed in a shape that corresponds to each other, while the rail groove and the supply groove are formed by extending downward from the horizontal groove in which the screw head of the short length screw is seated and transported. It includes a vertical groove that is transferred with the shaft inserted,
The upper surface of the horizontal groove is provided to cover part or all of the horizontal groove so that the screw head is caught when the short-length screw being transported moves,
The vertical groove is formed such that its lower end is opened through the lower surface of the supply block and the supply hose, respectively,
A center block provided to be fixed to the base plate and provided with a short length screw supplied by a supply block at the center thereof, while a driver unit penetrates and has a fastening portion formed through which the driver unit is lowered while being coupled to the short length screw, and the center block A jig block is provided on both sides, each hinged, in which a short-length screw drawn out from the supply block is seated and in place, while being rotated by a descending driver unit to open and return to the original position,
A step-opening jig groove is formed between the plurality of jig blocks at an end close to the supply block, and the upper surface of the jig groove is provided to be positioned at a height corresponding to the bottom surface of the horizontal groove of the rail groove, and the rail groove of the supply block A screw fastening device in which a short-length screw drawn out is inserted into a jig groove so that the screw head of the short-length screw is seated on the upper surface of the jig groove.
delete The method of claim 1,
The jig block includes a vertical block hinged to the center block and a horizontal block extending from the vertical block to the other jig block,
A screw fastening device in which stepped portions are formed at adjacent ends of both horizontal blocks to form jig grooves.
The method of claim 3,
A screw fastening device that can smoothly induce the entry of short-length screws into the inside of the jig groove by forming a curved surface gently recessed toward the jig groove on the upper surface of both horizontal blocks.
The method of claim 1,
A screw fastening device having side blocks fixed to base plates on both sides spaced apart from the center block, and a return spring between the side block and the jig block to return the rotated jig block to its original position.

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