JP2600300Y2 - Bit alignment base - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw suction type screw tightening machine in which a tightening rod provided at a tip thereof with a bit for screw tightening is rotatably and reciprocally inserted in a suction pipe. When suction is performed under the action of suction air, the axis of the bit is aligned so that it is properly positioned at the center of the suction pipe, and the axis of the bit exactly matches the axis of the screw hole of the screw mounting object. The present invention relates to a bit alignment base capable of accurately and quickly mounting a screw.

[0002]

2. Description of the Related Art Generally, as a bit centering device in a screw chuck of a screw suction type, for example, Japanese Utility Model Publication No. 4-29949.
A gazette is known. In this bit alignment device, as shown in FIGS. 4 and 5, a tightening rod (not shown) is rotatably and reciprocally inserted through a suction pipe 10 to drive a bit 12 provided at the distal end of the rod. Equipment (not shown)
, The air in the suction pipe 10 is sucked through a connecting pipe (not shown) by a suction pump (not shown) or the like, the screw 14 is sucked to the tip of the bit 12, and the rod is rotated in this normal state. The screw is tightened by pushing down while pressing.

In this case, in order to align the bit 12 with the axis of the suction pipe 10, a small-diameter portion 16 having a reduced inner diameter so as to have a diameter suitable for the outer diameter of the bit 12 is provided at the tip of the suction pipe 10. Screw the base 18 that has
The small-diameter portion 16
A flat portion 20 having a predetermined length is provided in a portion corresponding to the bit through which the small-diameter portion 16 is inserted, and the air from the small-diameter portion 16 is allowed to pass through the flat portion 20. Reference numeral 22 denotes an object to which the screw 14 is attached, and reference numeral 24 denotes a screw hole thereof.

[0004]

However, in the conventional screw tightening machine, the bit 12 is held in the gap formed by the inside diameter of the small diameter portion 16 of the base 18 of the suction pipe 10 and the outside diameter of the bit 12. It is configured to be able to move freely in the radial direction. This is because when the axis of the bit 12 and the axis of the screw hole 24 of the screw mounting object 22 are misaligned,
This is to absorb this.

[0005] However, this type of screw suction type screw tightening machine has a bit 1 in the small diameter portion 16 of the base of the suction pipe.
2 can move freely by the difference between the two diameters.
When the axes of the screw 2 and the screw hole 24 of the screw mounting object 22 are made to coincide with each other, unless the bit 12 is held at a position as close as possible to the predetermined axis, the positioning accuracy is reduced. Further, in order to adsorb the screw to the tip of the bit 12, a predetermined air circulation area is required in the suction pipe 10, and therefore, the bit 12 is processed to form a flat portion,
It is necessary to secure a flow area of the air in the suction pipe 10 in the small-diameter portion. For this reason, if a large flat portion is provided on the outer periphery of the bit 12, the circumferential portion guided in the small-diameter portion 16 is reduced. However, there is a problem in that the bit deflection increases and the alignment accuracy decreases.

Accordingly, an object of the present invention is to screw a cylindrical base, which is provided with a bit guide member provided with a plurality of intake holes around a guide hole for guiding a bit, to the tip of a suction pipe. As a result, the necessary amount of air flowing through the outer periphery of the bit can be sufficiently secured, and when the screw is suctioned by the action of suction air, the bit shaft center is properly positioned at the center of the suction pipe. It is an object of the present invention to provide a bit alignment base that can be used.

[0007]

In order to achieve the above object, a bit alignment base according to the present invention inserts a tightening rod having a bit attached to the tip into a suction pipe so as to rotate and reciprocate. In the screwing machine that is supported, a bit guide member is fitted inside at the tip of the suction pipe.
Screwed a cylindrical die you type mounted before Symbol suction pipe and coaxially provided bit guide hole for said bit in the axial portion slidably inserted and held in the bit guide member, the bit guide An intake hole is evenly arranged around the hole, and an effective flow cross-sectional area capable of securing a flow rate required for suction air flowing through the suction pipe to adsorb the screw at the tip of the bit through the intake hole. Is set to have

In this case, the bit guide member holds the bit
A radial partition plate is placed around the guide hole to insert and hold
When this is fitted into the base,
Space through which suction air flows through the partition plate and the inner wall of the base
The configuration is such that a portion is formed .

[0009] Also, bi Ttogaido member comprises evenly arranged a plurality of small holes around the guide hole for inserting holding the bit, the plurality of small holes it when the fitted mounted inside the cap Thus, a space through which the suction air flows can be formed. Further, the bit guide member is formed in a multifaceted shape by providing a number of flat portions while leaving a part of the outer peripheral portion on the outer periphery of the bit guide member, which is fitted inside the base.
A space through which suction air flows can be formed by the flat portion and the inner wall of the base when the device is inserted and mounted. And
Bit guide member comprises evenly arranged a plurality of arcuate portions, leaving the outer periphery portion on the outer periphery of the bit guide member, said plurality of <br/> this when the fitted mounted inside the cap A space through which the suction air flows can be formed by the arc portion and the inner wall of the base. The bit is attached to the tip of the bit
At least one of the formed screw head mating grooves
A predetermined length in the bit axis direction from a pair of fitting grooves
The air suction groove may be extended.

[0010]

According to the bit alignment base of the present invention, a cylindrical base formed by fitting a bit guide member having a plurality of intake holes around a guide hole for guiding a bit is attached to the tip of a suction pipe. By screwing on the screw, the necessary amount of air flowing through the outer periphery of the bit can be sufficiently secured, and the suction effect on the head of the screw can be significantly improved. At the time of suction, the axis of the bit is properly positioned at the center of the suction pipe, so that the screw tightening operation can be achieved smoothly.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a bit alignment base according to the present invention.

FIGS. 1 and 2 show an embodiment of a bit alignment base according to the present invention. For convenience of description, the same components as those of the conventional bit alignment base shown in FIGS. 4 and 5 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 10 denotes a suction pipe, and 12 denotes a bit. Therefore, first, the configuration of the bit alignment base will be described. The cylindrical base 30 is provided with a suction pipe 10 by screwing one end of the outer periphery thereof.
A guide hole 34 through which the bit 12 is inserted is screwed coaxially with the suction pipe 10 at the tip of
The bit guide member 32 having a shape is fitted and mounted at a predetermined position, and is arranged so that its axis is coaxial with the axis of the base 30.

As shown in FIG. 2, the bit guide member 32 has a predetermined thickness, and a plurality of radial partition plates 36 are arranged on the outer periphery of a guide hole 34 formed in the shaft core.
When the bit guide member 32 is fitted into the base 30, the inner wall of the base 30 and the plurality of partition plates 36 form a space 38 through which suction air flows. In this case, the cross-sectional area of the space 38 is set so that a sufficient amount of air can flow therethrough .

On the other hand, the bit 12 has an air suction groove 44 having a predetermined length in the axial direction of the bit 12 from at least a pair of axially symmetric groove portions of the screw head fitting groove 42 formed at the distal end portion 40. Extend. Bit 1 configured in this way
By inserting the screw head 2 into the guide hole 34 of the bit guide member 32, it is possible to enhance the holding of the screw head fitted to the tip end portion 40 of the bit 12 by air suction.

FIG. 3 shows a modification of the bit guide member 32. FIG. 3A shows the bit guide member 32 in which a plurality of small holes 38a are uniformly arranged around the guide hole 34, and the small holes 38a are fitted into the inside of the base 30 to mount the bit guide member 32. A space for flowing suction air is formed by 38a.

FIG. 3B shows the bit guide member 32 having a large number of flat portions 35 with a part of the bit guide member 32 left on its outer periphery.
To form a polyhedral shape, which is fitted inside the base 30.
By inserting and mounting, the flat portion 35 and the inner wall of the base 30 form a space 38b through which suction air flows.

Further, FIG. 3 (c) shows that the bit guide member 32 is formed by uniformly arranging a plurality of arc portions 37 while leaving a part of the outer peripheral portion thereof, and fitting the bit guide member 32 into the base 30. The plurality of arc portions 37 and the inner wall of the base 30 form a space 38c through which suction air flows.

The shape of the bit guide member 32 is not limited to the above-described configuration, as long as a space can be provided around the guide hole 34 where an effective flow area through which necessary air flows can be secured. Needless to say.

As described above, by arranging the bit alignment base as described above, by operating the suction pump, the air sucked from the tip portion of the bit 12 is reduced by the air suction provided on the bit. The space 44 , 38a, 38b, 38 serving as an intake hole formed in the outer periphery of the groove 44 and the guide hole 34 of the bit guide member 32 is filled with an effective flow cross-sectional area through which air required for suction flows.
The suction effect on the head of the screw can be significantly improved.

In addition, since the radial deflection of the bit 12 can be reliably suppressed, and the bit can be positioned coaxially with the axis of the suction pipe 10, the screw held at the tip of the bit can be attached. Attachment and tightening work on the object can be achieved smoothly and quickly.

While the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many modifications and changes can be made without departing from the spirit of the present invention.

[0023]

As described above, the bit alignment base according to the present invention is such that a cylindrical base in which a bit guide member is inserted and mounted at the tip of a suction pipe is screwed coaxially with the suction pipe. The bit guide member is provided with a bit guide hole for slidably inserting and holding the bit in a shaft core portion thereof, and equally arranging intake holes around the bit guide hole. The suction air flowing through the suction pipe has an effective flow cross-sectional area capable of securing a flow rate necessary for adsorbing the screw to be tightened to the tip of the bit, so that the bit is accurately aligned with the axis of the suction pipe. The holding of the screw can be strengthened by aligning it so that it is coaxial with the screw, and the screw held at the tip of the bit can be easily and reliably aligned with the object to be mounted. Efficient work Ku addition can be accurately performed, which contributes effectively to the improvement of productivity with improved work efficiency is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a bit alignment base according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIGS. 3A to 3C are cross-sectional views showing modified examples of the bit guide member of the bit alignment base according to the present invention.

FIG. 4 is a schematic structural cross-sectional view showing the structure of a conventional bit alignment base and the mounting state of screws.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

DESCRIPTION OF SYMBOLS 10 Suction pipe 12 Bit 14 Screw 16 Small diameter part 18 Base 20 Flat part 22 Screw mounting object 24 Screw hole 30 Base 32 Bit guide member 34 Guide hole 36 Partition plate 38, 38a, 38b, 38c Space 40 Tip 42 Screw head fitting groove 44 Air suction groove

Claims (6)

(57) [Scope of request for utility model registration] 1. A screw tightening machine in which a tightening rod having a bit mounted on a tip is rotatably and reciprocally inserted and supported in a suction pipe, wherein a bit guide member is inserted and mounted inside a tip of the suction pipe. the tubular mouthpiece is screwed before Symbol suction pipe and coaxially provided bit guide hole for said bit in the axial portion slidably inserted and held in the bit guide member,
An intake hole is uniformly arranged around the bit guide hole, and the suction air flowing through the intake pipe through the intake hole can secure a flow rate necessary for adsorbing the screw at the tip of the bit. A bit alignment base, which is set to have a flow cross-sectional area. 2. A bit guide member having a radial partition plate disposed around a guide hole for inserting and holding a bit, and when the radial partition plate is fitted and mounted inside the base, the plurality of partition plates and the base are connected to each other. The bit alignment base according to claim 1, wherein a space through which the suction air flows is formed by the inner wall. 3. A bit guide member comprising a plurality of small holes uniformly arranged around a guide hole for inserting and holding a bit.
2. The bit alignment base according to claim 1, wherein a space through which the suction air flows is formed by the plurality of small holes when the base is fitted into the base. 4. A bit guide member having a plurality of flat portions provided on the outer periphery of the bit guide member while leaving a part of the outer peripheral portion to form a polyhedral shape, which is fitted into the base. The bit centering die according to claim 1, wherein a space through which suction air flows is formed by the flat portion and the inner wall of the die when mounted. 5. The bit guide member, the plurality on the outer periphery of the bit guide member becomes evenly arranging a plurality of arcuate portions, leaving part of the outer peripheral portion, which upon insertion mounted inside the cap 2. The bit alignment die according to claim 1, wherein a space through which suction air flows is formed by the arc portion and the inner wall of the die. 6. A bit extends an air suction groove of a predetermined length in the bit axis direction from at least a pair of axially symmetrical fitting grooves among a plurality of screw head fitting grooves formed at the tip of the bit. The bit alignment base according to any one of claims 1 to 5, wherein the base is provided.