JPH0661426U - Base for bit alignment - Google Patents

Abstract

(57) [Abstract] [Purpose] A cylindrical mouthpiece, which is equipped with a bit guide member having a plurality of intake holes around the guide hole for guiding the bit, is screwed to the tip of the suction pipe. It is possible to secure a sufficient amount of air that flows through the outer circumference of the bit, and moreover, to align the bit shaft core properly at the center of the suction pipe when sucking the screw by the action of suction air. Obtain a spinneret for bit alignment. A bit guide member 32 is attached to the inside of a cylindrical base 18 screwed coaxially with the tip of the suction pipe 10, and the bit guide member 32 is attached to the shaft core of the bit 12. A bit guide hole 34 for slidably inserting and holding is provided, and a plurality of intake holes 38 are evenly arranged around the bit guide hole 34.
Suction air flowing through the suction pipe 10 through the bit 8
It is configured to have an effective flow cross-sectional area that can secure the flow rate required to adsorb the screw 14 at the tip of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw suction type screw tightener in which a tightening rod provided with a bit for screw tightening is inserted through a suction pipe so as to be rotatable and reciprocally movable. Align the shaft of the bit with the center of the suction pipe during suction, and then install the screw by aligning the shaft of the bit with the shaft of the screw hole of the screw mounting target. A bit aligning base that can be achieved accurately and quickly.

[0002]

[Prior art]

 Generally, for example, Japanese Utility Model Publication No. 4-29949 is known as a bit aligning device in a screw suction type screw tightening machine. In this bit aligning device, as shown in FIGS. 4 and 5, a tightening rod (not shown) is rotatably and reciprocally inserted through the suction pipe 10 to drive a bit 12 provided at the tip of the rod. It is rotated by a device (not shown), the air in the suction pipe 10 is sucked through a connection pipe (not shown) by a suction pump (not shown), etc., and the screw 14 is attracted to the tip of the bit 12. In this normal state, the screw is tightened by pushing down while rotating the rod.

In this case, in order to align the bit 12 with the axial center of the suction pipe 10, a small-diameter portion 16 whose inner diameter is narrowed to have a diameter suitable for the outer diameter of the bit 12 is provided at the tip of the suction pipe 10. A flat portion 20 having a predetermined length is provided at a corresponding portion of the bit through which the small diameter portion 16 is inserted in order to screw the base 18 to be held and to adsorb the screw 14 to the tip of the bit 12. Venting from the small diameter portion 16 is made possible through this. Reference numeral 22 indicates an object to which the screw 14 is attached, and 24 indicates its screw hole.

[0004]

[Problems to be solved by the device]

 However, in the conventional screw tightener, the bit 12 can freely move in the radial direction within the gap formed by the inner diameter of the small diameter portion 16 of the mouthpiece 18 of the suction pipe 10 and the outer diameter of the bit 12. Is configured. This is designed to be able to absorb the misalignment between the axial center of the bit 12 and the axial center of the screw hole 24 of the screw attachment object 22.

However, in this type of screw suction type screw tightening machine, since the bit 12 can freely move within the small diameter portion 16 of the mouthpiece of the suction pipe by the difference between the diameters of the two, the bit 12 and the screw mounting object 22. When aligning the shaft center with the screw hole 24, if the bit 12 is not held at a position as close to the predetermined shaft center position as possible, the positioning accuracy is lowered. Further, in order to attract the screw to the tip of the bit 12, a predetermined air circulation area is required in the suction pipe 10. Therefore, the bit 12 is processed to form a flat portion, and the suction pipe 10 in the small diameter portion is formed. It is necessary to secure a circulating area for the air inside. Therefore, if the bit 12 has a large number of flat portions on the outer circumference, the circumferential portion to be guided in the small diameter portion 16 is reduced, so that the fluctuation of the bit will occur. However, there is a problem in that the alignment accuracy increases and the alignment accuracy decreases.

Therefore, an object of the present invention is to screw a cylindrical mouthpiece, which is equipped with a bit guide member having a plurality of intake holes around a guide hole for guiding a bit, to the tip of a suction pipe. By doing so, it is possible to secure a sufficient amount of air that flows through the outer circumference of the bit, and adjust so that the bit shaft core is properly positioned at the center of the suction pipe when the screw is sucked by the action of suction air. An object is to provide a spinneret for bit alignment that can be cored.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a bit aligning mouthpiece according to the present invention is a screw tightening machine in which a tightening rod having a bit mounted at its tip is rotatably and reciprocally inserted and supported in a suction pipe. At the tip of the suction pipe, a cylindrical base with a bit guide member mounted inside is screwed coaxially with the suction pipe, and the bit can be slidably attached to the bit guide member at its axial center. A bit guide hole for inserting and holding is provided in the hole, and intake holes are evenly arranged around this bit guide hole.Suction air flowing through the intake pipe through the intake hole causes the screw to be screwed at the tip of the bit. It is characterized in that it is set to have an effective flow cross-sectional area that can secure the flow rate required for adsorption.

In this case, the bit has an air suction groove having a predetermined length in the bit axis direction from at least a pair of axially symmetrical fitting groove portions among a large number of screw head fitting grooves formed at the tip portion of the bit. The structure will be extended.

In addition, the bit guide member is provided with a radial partition plate around a guide hole through which the bit is inserted and held. When the partition plate is mounted inside the base, the plurality of partition plates and the base are attached. It is possible to form a space portion through which the suction air flows through with the inner wall of the. Further, the bit guide member has a plurality of small holes evenly arranged around the guide hole through which the bit is inserted and held, and when the small hole is mounted inside the mouthpiece, suction air is sucked by the plurality of small holes. It is also possible to form a space that flows through. Furthermore, the bit guide member is provided with a large number of flat parts on the outer circumference of the bit guide member while leaving a part of the outer peripheral part thereof to form a polyhedral shape. It is also possible to form a space portion through which suctioned air flows by the portion and the inner wall of the base. The bit guide member is formed by evenly disposing a plurality of arc portions on the outer periphery of the bit guide member while leaving a part of the outer peripheral portion, and when the bit guide member is mounted inside the die, the arc portion and the die are separated. It is also possible to form a space through which the suction air flows by the inner wall.

[0010]

[Action]

 According to the bit aligning mouthpiece of the present invention, a cylindrical mouthpiece having a bit guide member provided with a plurality of intake holes around the guide hole for guiding the bit is screwed to the tip end of the suction pipe. By doing so, it is possible to secure a sufficient amount of air that flows through the outer periphery of the bit, and it is possible to significantly improve the suction effect on the head of the screw, and also to suck the screw by the action of suction air. At this time, the shaft center of the bit can be properly positioned in the center of the suction pipe, and the screw tightening work can be smoothly achieved.

[0011]

【Example】

 Next, an embodiment of a bit aligning die according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of a bit aligning die of the present invention. For convenience of explanation, the same components as those of the conventional bit aligning die shown in FIGS. 4 and 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

1 and 2, reference numeral 10 indicates a suction pipe, and 12 indicates a bit. Therefore, first, the configuration of the bit aligning die will be described. A cylindrical base 30 is screwed at one end of the outer periphery thereof and is screwed coaxially with the suction pipe 10 at the tip of the suction pipe 10, and a guide for inserting the bit 12 into the base 30. A bit guide member 32 having a hole 34 is fitted and attached at a predetermined position, and its axis is arranged coaxially 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 portion thereof. When the bit guide member 32 is fitted and mounted in the mouthpiece 30, the inner wall of the mouthpiece 30 and the plurality of partition plates 36 form a space portion 38 for passing suction air. In this case, the space portion 38 has a flow area set so that a sufficient amount of air flowing through the space portion 38 can be secured.

On the other hand, the bit 12 has a pair of groove portions, which are at least axisymmetric with respect to the screw head fitting groove 42 formed in the tip portion 40, of the bit 12 so as to suck air of a predetermined length in the axial direction of the bit 12. The groove 44 is extended. By inserting the bit 12 thus configured 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 modifications of the bit guide member 32, respectively. In FIG. 3A, the bit guide member 32 has a plurality of small holes 38a evenly arranged around the guide hole 34, and the small holes 38a are mounted inside the mouthpiece 30 so that the large number of small holes are formed. 38a forms a space for passing the suction air.

Further, FIG. 3B shows that the bit guide member 32 is formed into a polyhedral shape by forming a large number of flat portions 35 on the outer periphery of the bit guide member 32 while leaving a part thereof, and the flat portion 35 is mounted inside the die 30. As a result, the flat portion 35 and the inner wall of the mouthpiece 30 form a space portion 38b for passing suction air.

Further, as shown in FIG. 3 (c), the bit guide member 32 has a plurality of circular arc portions 37 evenly arranged with a part of its outer peripheral portion left, and is fitted and mounted inside the mouthpiece 30. A space portion 38c for passing suctioned air is formed by the plurality of arc portions 37 and the inner wall of the base 30.

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

As described above, by constructing the bit aligning mouthpiece as described above, the air sucked from the tip portion of the bit 12 by operating the suction pump is the air sucked in the bit. Sufficiently secure an effective flow area through which air is sucked from the spaces 38a, 38b, 38c serving as intake holes formed on the outer periphery of the groove 44 and the guide hole 34 of the bit guide member 32, and which is necessary for suction. This makes it possible to significantly improve the suction effect on the head of the screw.

Further, radial runout of the bit 12 can be surely suppressed, and the bit can be positioned coaxially with the axis of the suction pipe 10. Therefore, the screw held at the tip of the bit can be attached. It is possible to smoothly and swiftly perform mounting and tightening work on an object.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many improvements and modifications can be made without departing from the spirit thereof.

[0023]

[Effect of device]

 As described above, the bit aligning mouthpiece according to the present invention comprises a cylindrical mouthpiece having a bit guide member mounted inside the tip of a suction pipe and screwed coaxially with the suction pipe. The guide member is provided with a bit guide hole through which the bit is slidably inserted and held in the shaft core portion, and intake holes are evenly arranged around the bit guide hole, and the intake hole flows through the suction pipe. By constructing the bit so that the suction air passing therethrough has an effective flow cross-sectional area that can secure the flow rate required to adsorb the tightening screw at the tip of the bit, the bit will be exactly coaxial with the axis of the adsorption pipe. It is possible to align the core, and it is possible to easily and surely align the screw held at the tip of the bit with the object to which it is attached, so that the screw tightening work can be performed efficiently and accurately. , Business effect contributing to the improvement of productivity with the improvement of efficiency is extremely not large.

[Brief description of drawings]

FIG. 1 is a schematic structural cross-sectional view showing an embodiment of a bit aligning die according to the present invention.

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

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

FIG. 4 is a schematic structural cross-sectional view showing a structure of a conventional bit aligning die and a mounting state of a screw.

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

[Explanation of symbols]

 10 suction pipe 12 bit 14 screw 16 small diameter part 18 cap 20 flat part 22 screw mounting object 24 screw hole 30 cap 32 bit guide member 34 guide hole 36 partition plate 38, 38a, 38b, 38c space part 40 tip part 42 screw head Part fitting groove 44 Air suction groove

Claims (6)

[Scope of utility model registration request] 1. A screw tightener in which a tightening rod having a bit attached to its tip is rotatably and reciprocally inserted through and supported in a suction pipe, wherein a bit guide member is attached inside the suction pipe. A cylindrical mouthpiece is screwed coaxially with the suction pipe, and a bit guide hole is provided in the bit guide member for slidably inserting and holding the bit at its shaft center. Intake holes are evenly arranged around the
The bit alignment is set so that the suction hole has an effective flow cross-sectional area that can secure a flow rate required for sucking air flowing through the suction pipe to adsorb the screw at the tip of the bit. Mouthpiece. 2. The bit extends an air suction groove of a predetermined length in the bit axis direction from at least a pair of axially symmetrical fitting groove portions of a large number of screw head fitting grooves formed at the tip portion of the bit. The bit aligning die according to claim 1, which is provided. 3. The bit guide member comprises a radial partition plate arranged around a guide hole through which the bit is inserted and held. When the partition plate is mounted inside the base, the plurality of partition plates and the inner wall of the base are provided. The bit aligning die according to claim 1, wherein a space portion through which suctioned air flows is formed by. 4. The bit guide member has a plurality of small holes evenly arranged around a guide hole for inserting and holding the bit.
The bit aligning die according to claim 1, wherein a space portion through which suctioned air flows is formed by the plurality of small holes when this is mounted inside the die. 5. The bit guide member is provided with a large number of flat portions on the outer circumference of the bit guide member while leaving a part of the outer peripheral portion to form a polyhedral shape, and when the bit guide member is mounted inside the die, The bit aligning die according to claim 1, wherein the flat portion and the inner wall of the die form a space portion through which suctioned air flows. 6. A bit guide member, wherein a plurality of circular arc portions are evenly arranged on the outer periphery of the bit guide member with a part of the outer peripheral portion left, and the circular arc portion is mounted when the circular arc portion is mounted inside the die. The bit aligning die according to claim 1, wherein a space portion through which suctioned air flows is formed by the inner wall of the die and the die.