JPH07328870A - Machine screw fastener - Google Patents

Abstract

PURPOSE:To easily position a machine screw in the center of a machine screw inserting hole even if the center of the machine screw inserting hole of a fastening object member is slightly dislocated to the center of a screw part when the machine screw is fastened by vertically holding the machine screw by a catcher, and vertically attracting the machine screw to an attracting pipe. CONSTITUTION:A catcher 1 is formed in a taper shape so that the tip of a screw part 5 of a machine screw 3 is locked. In an attracting pipe 7, a circumferential directional swing at the time to attract a head part 10 of the machine screw 3 held by the catcher 1 in a swing preventive part 17 arranged on the outer periphery, is regulated by a guide member 8, and the machine screw 3 is lowered together with a machine screw fastening bit 9 while attracting the head part 10 of the machine screw 3, and after the tip side of the catcher 1 is push-opened, the swing preventive part 17 to regulate the circumferential directional swing of the attracting pipe 7 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw tightening machine for performing screw tightening after sucking and holding screws, and in particular, the screws are sucked vertically to the suction pipe, and the screws are screwed into the screw insertion holes of the member to be tightened. An easily guided screw tightener.

[0002]

2. Description of the Related Art A conventional screw tightening machine will be described with reference to FIGS. 3 to 4. Reference numeral 1 denotes a lower end of a flat washer 4 incorporated in a screw 3 fed from a screw supply port 2 to receive the self weight of the screw 3. Is a catcher that holds the screw portion 5 in a downward state, and is openable and closable, and its tip end side is always elastically biased in a closing direction by a spring (not shown).
At this time, the flat washer 4 and the spring washer 6 are incorporated into the screw 3, so that the screw 3 is held in an inclined state by the influence of the spring washer 6. Reference numeral 7 denotes a suction pipe for sucking the screw 3, which can be moved up and down. Reference numeral 8 is a guide member that has a screw supply port and that guides the suction pipe up and down. Further, 9 is formed so that the tip thereof fits into a fitting groove 11 (for example, a fitting groove of a screw with a cross hole) formed in the head 10 of the screw 3, and the screw 3 is screwed by itself by a screw fastening member. It is a bit that is screwed to 12, and is configured to be slidable in the vertical direction on the inner peripheral surface of the suction pipe 7.

Next, a description will be given of the operation when the screw tightening work is performed by this screw tightening machine. With respect to the screw 3 held by the catcher 1, the suction pipe 7 and the bit 9 descend in the guide member 8 and screw Aspirate 3. At this time, the upper surface of the flat washer 4 incorporated in the screw 3 is sucked and held by the stepped surface 13 formed on the inner peripheral surface of the suction pipe 7 in a face-to-face contact state. At the same time, the tip of the bit 9 fits into the fitting groove 11 of the screw 3. Then, the screw 3 is sucked by the suction pipe 7, and the tip portion 14 of the suction pipe 7 is further lowered while pushing the tip side of the catcher 1 open while the tip of the bit 9 is fitted in the fitting groove 11 of the screw 3. The tip of the screw portion 5 is inserted into the screw insertion hole 16 of the member 15 to be tightened, and the screw tightening member 12 is screwed.

Since the screw having only the spring washer does not have the flat washer, it means that the head of the screw is held in the suction pipe in a state of being in contact with the tip of the bit.

[0005]

However, since the screw has a flat washer and a spring washer, the screw is inclined and attracted to the suction pipe due to the influence of the spring washer. Therefore, the tip of the screw portion and the center of the bit are largely displaced from each other, and the screw insertion hole of the member to be tightened is not aligned with each other, which causes a problem that the screw cannot be tightened. Also, the screw with only the spring washer is held by the catcher in an inclined state due to the influence of the spring washer, so it is adsorbed while being inclined by the adsorption pipe, and the tip of the screw part and the center of the bit are largely displaced. It caused a similar problem. In addition, there is a problem in that there is a gap between the suction pipe and the guide member, the suction pipe swings when sucking the screw, and the screw cannot be vertically sucked. These problems are more remarkable as the screw thread length is longer.

The present invention has been made in view of the above-mentioned points. The screw is held vertically by the catcher, and the screw can be vertically sucked by the suction pipe, and at the time of screwing the screw, the center of the screw portion is screwed. On the other hand, it is an object of the present invention to provide a screw tightening machine that can be easily positioned at the center of the screw insertion hole even if the center of the screw insertion hole of the member to be tightened is slightly displaced.

[0007]

In order to solve the above-mentioned problems, the present invention is formed in a taper shape so that the tip of the screw portion of the screw fed from the screw supply port can be locked, and the tip side can be opened and closed. A plurality of catchers, a suction pipe arranged to suck the heads of the screws held by the catcher and capable of moving up and down, and a screw supply port, and a guide for guiding the up and down movement of the suction pipe. A member, a bit for tightening a screw sucked by the suction pipe, and a bit provided on the outer periphery of the suction pipe, and restricts the circumferential deflection of the suction pipe in the guide member during screw suction by the suction pipe, The tip end side of the catcher is pushed open by the tip end portion of the suction pipe, and then the steady stop portion for canceling the circumferential shake regulation of the suction pipe is provided.

[0008]

[Function] By holding the screw part of the screw by the catcher, the screw is held vertically by the catcher, and the swing-out part provided on the outer periphery of the suction pipe can regulate the swing of the suction pipe in the circumferential direction, and the suction pipe can be controlled. Since the head of the screw is received at, the screw is adsorbed and held vertically on the adsorption pipe. After the screw is sucked, the steady rest provided on the outer circumference of the suction pipe is separated from the guide member, and the swinging restriction of the suction pipe is released, so that the suction pipe can swing in the circumferential direction and the screw insertion hole of the tightened member. Even if the position of is slightly displaced, the screw is easily guided to the center of the screw insertion hole of the member to be tightened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1 and 2, but the same parts as those of the conventional example will be designated by the same reference numerals, and detailed description thereof will be omitted. Air is supplied to and exhausted from a cylinder (not shown) to operate a piston in the cylinder, and the suction pipe 7 and the bit 9 are arranged to be movable up and down in association with the operation of the piston. The suction pipe 7 is formed so that the screw 3 can be sucked and the head 10 thereof can be sucked and held. A steady rest 17 is provided on the outer circumference of the suction pipe 7 to prevent the suction pipe 7 from swinging in the circumferential direction during screw suction with the guide member 8. Bit 9 is a driver with a built-in motor (not shown)
Is attached to the lower end of the suction pipe 7, and its tip is formed so as to fit in the fitting groove 11 formed in the head 10 of the screw 3, and is rotatable and slides vertically on the inner peripheral surface of the suction pipe 7. It is configured to be movable. Reference numeral 1 is a plurality of catchers for holding the screws 3 fed from the screw supply port 2. Since this catcher 1 can hold the screw portion 5 of the screw 3, the inner diameter of the upper end side of the catcher 1 is slightly larger than the diameter of the screw portion 5 of the screw 3, and the lower end side thereof is slightly smaller, that is, formed in a tapered shape. Has been done.

Next, a description will be given of the operation when the screw tightening work is carried out by this screw tightening machine. The screw 3 is fed from the screw supply source into the catcher 1 through the screw supply port 2.
At this time, since the inner diameter of the lower end side of the catcher 1 is formed slightly smaller than the diameter of the screw portion 5 of the screw 3, the tip of the screw portion 5 is locked to the inner peripheral wall of the catcher 1, and the side surface of the screw portion 5 is The screw 3 is held substantially vertically by the catcher 1 while being surrounded by the peripheral wall. In this state, air is supplied to the cylinder, and as the piston in the cylinder descends, the suction pipe 7 interlocking with the piston descends the guide member 8 and reaches the head 10 of the screw 3 held by the catcher 1. The tip side of the suction pipe 7 enters and the screw 3 is sucked. At this time, the clearance between the steady portion 17 provided on the outer circumference of the suction pipe and the guide member 8 is small, and the swing of the suction pipe 7 in the circumferential direction does not occur, so that the screw 3 can be vertically suction-held. Then, when the suction pipe 7 further descends, the tip portion 14 of the suction pipe 7 hits the catcher 1 to push open the tip side of the catcher 1 and further descend.
At this time, the steady rest 17 provided on the outer periphery of the suction pipe 7
Is separated from the guide member 8, and the suction pipe 7 can swing in the circumferential direction. Then, the tip of the screw portion 5 enters the screw insertion hole 16 of the member 15 to be tightened, and the screw tightening member 12 is screwed.

As described above, according to the present invention, the screw portion of the screw is held by the catcher, and the screw is sucked by the suction pipe provided on the outer circumference with the steadying portion for restricting the shake in the circumferential direction at the time of sucking the screw. The screw is held vertically on the pipe, and the screw portion and the screw insertion hole of the member to be tightened are aligned with each other to enable screw tightening work. Further, after the screw suction, the steady rest provided on the outer circumference of the suction pipe is separated from the guide member, and the suction pipe can swing in the circumferential direction, so that the center of the screw portion of the screw and the screw insertion hole of the tightened member are aligned. Even if the tip of the screw part is slightly misaligned and gets caught at the inlet of the screw insertion hole of the tightening member, the suction pipe is guided to the screw insertion hole and swings toward the center of the screw insertion hole. The screw tightening work can be performed by aligning the center of the tightening member with the screw insertion hole.

[0012]

According to the present invention, a plurality of catchers which are formed in a tapered shape so that the tip of the screw portion of the screw fed from the screw supply port can be locked and whose tip side can be opened and closed,
A suction pipe that sucks the head of the screw held by the catcher and that can be moved up and down, a guide member that includes the screw supply port, and that guides the suction pipe up and down, and the suction pipe. A bit for tightening the sucked screw and a bit provided on the outer circumference of the suction pipe to restrict the circumferential deflection of the suction pipe in the guide member when the screw is sucked by the suction pipe, and suck the tip side of the catcher. By having a steady rest that releases the swing regulation in the circumferential direction of the adsorption pipe after pushing open at the tip of the pipe, the screw can be held almost vertically in the catcher regardless of the presence or absence of a flat washer or a spring washer, And the screw can be vertically adsorbed to the suction pipe, and when tightening the screw,
Even if the center of the screw insertion hole of the tightened member is slightly displaced from the center of the screw part, the suction pipe can swing so that the screw is easily guided to the center of the screw insertion hole of the tightened member. As a result, defective screw tightening can be reduced, and good screw tightening work can be performed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a screw holding state of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a screw adsorption state of the embodiment.

FIG. 3 is a partial cross-sectional view showing a screw holding state of a conventional example.

FIG. 4 is a partial cross-sectional view showing a conventional example of screw adsorption.

[Explanation of symbols]

 1 Catcher 2 Screw supply port 3 Screw 5 Screw part 7 Adsorption pipe 8 Guide member 9 Bit 10 Head part 17 Steady stop part

Claims (1)

[Claims] 1. A plurality of catchers, each of which is formed in a tapered shape so that a screw thread tip of a screw fed from a screw supply port of a screw tightener is locked, and the tip side of which is openable and closable, and the catcher. A suction pipe that sucks the head of the held screw and that can be moved up and down, a guide member that includes the screw supply port, and that guides the suction pipe up and down, and is sucked by the suction pipe. A bit for screwing a screw and provided on the outer circumference of the suction pipe,
When the screw is sucked by the suction pipe, the swing of the suction pipe in the circumferential direction is regulated in the guide member, and the swing side regulation of the suction pipe is released after the tip side of the catcher is pushed open by the tip of the suction pipe. A screw tightening machine characterized by having a steady rest.