JP4089568B2 - Bit attachment / detachment jig for screw tightening machine - Google Patents

Description

  In the present invention, a driver bit rotated by an air motor or the like is engaged with a screw to rotate the screw, and at the same time, a piston on which the driver bit is mounted is accommodated in a cylinder and the piston is screwed in with compressed air. More particularly, the present invention relates to a bit attaching / detaching jig for a screw tightening machine capable of easily replacing a damaged or worn driver bit.

  The impact mechanism is driven via an air motor that is driven to rotate by using compressed air as a power source to rotate the rotation drive shaft, and a screwdriver bit mounted on the rotation drive shaft is engaged with the screw so that the screw is inserted in the screwing direction. In addition to rotating, a piston formed integrally with the rotary drive shaft is slidably accommodated in the cylinder, and compressed air introduced into the cylinder is applied to the piston to slide the rotary drive shaft in the cylinder. 2. Description of the Related Art There is known a compressed air-driven screw tightening machine configured to drive a driver bit mounted on a rotary drive shaft in a screwing direction by operating it. In the conventional screw tightening machine described above, a nose portion for guiding the driver bit in the rotation and sliding directions is formed below the housing that houses the air motor, the rotation drive shaft, the cylinder, and the like, and is supplied to this nose portion. The screw is screwed toward the tip of the nose portion by the driver bit driven in the rotation and propulsion direction.

  The driver bit in such a screw tightening machine is considered as a consumable item because it frequently wears and breaks during use.For this reason, the damaged or worn driver bit is removed from the screw tightening machine and a new driver bit is installed. The driver bit to be attached to the screw tightener is frequently replaced. In the conventional screw tightening machine described above, the rear end portion of the driver bit formed in the hexagonal column shape is inserted into the hexagonal hole-shaped mounting portion formed at the end portion of the rotation drive shaft that is rotationally driven by the air motor, The driver bit is mounted on the mounting portion of the rotary drive shaft by engaging the steel ball disposed in the mounting portion with the annular groove formed on the outer peripheral surface of the hexagonal columnar portion of the driver bit so that the driver bit can move forward. ing.

In order to release a damaged or worn driver bit from the screw tightening machine in the above conventional screw tightening machine, first remove the mounting bolts and the like to remove the nose from the housing, thereby exposing the tip of the driver bit. The tip of the driver bit is gripped by a pliers or the like and pulled out from the mounting portion. Furthermore, to install a new driver bit, insert the hexagonal shaft part of the base of the driver bit into the mounting part of the rotary drive shaft, prepare a screw that matches the driver bit, and fit the recess of the screw to the tip of the driver bit. In the combined state, the tip end side of the screw is hit with a hammer or the like so that the driver bit is attached to the attachment portion.
Japanese Utility Model Laid-Open No. 5-16148

  In the above prior art, when the mounting load of the bit ring that urges the steel ball arranged in the mounting portion formed on the rotary drive shaft inward is large, the tip of the driver bit is plied by the pliers. Even if it is gripped, the driver bit cannot be pulled out from the mounting portion because a large pulling force in the axial direction cannot be applied to the driver bit. In addition, since the mounting part of the rotary drive shaft is inside the housing, it cannot be determined whether the hexagonal shaft part of the driver bit is aligned with the hexagonal hole of the mounting part. May not fit in the hexagon socket. Also, hitting more than necessary when the hexagonal shaft and the hexagonal hole are not aligned may damage the machine. Further, it cannot be determined whether or not the driver bit is mounted at the proper mounting position of the mounting portion, and the tool may be operated in an incomplete mounting state, resulting in air leakage or malfunction.

  The present invention solves the above-mentioned problems in the prior art, and is for a screw tightening machine that can easily remove a damaged driver bit from a screw tightening machine and attach a new driver bit to the screw tightening machine at a work site. It is an object to provide a bit attaching / detaching jig.

  In order to solve the above problems, a bit attaching / detaching jig for a screw tightening machine according to the present invention has a large-diameter flange formed in a large-diameter columnar shape and projects from one end side of the large-diameter flange toward the axial direction. A fixing means configured to fix the tip end portion of the driver bit to the other end side of the large-diameter collar portion. A recess for fitting a tip of a driver bit is formed on the end surface of the small-diameter column body portion.

  Further, the invention of claim 2 is that a mark set so as to coincide with the mark of the screw tightener is formed by mounting a driver bit at a regular mounting position on the outer peripheral surface of the small-diameter column body portion. Features.

  According to the present invention, the large-diameter flange portion formed in a large-diameter columnar shape and a smaller diameter than the large-diameter flange portion integrally formed by protruding from one end side of the large-diameter flange portion in the axial direction. The fixing means is formed by the formed small-diameter column body portion, and can be fixed to the other end side of the large-diameter collar portion, and the driver bit can be fixed to the end surface of the small-diameter column body portion. By using a bit attachment / detachment jig with a recess for fitting the tip of the bit, it is possible to easily remove the driver bit that could not be removed even when using a pliers, Work efficiency is improved by eliminating the trouble of requesting repairs to a dealer. In addition, it is not necessary to carry out work with danger such as holding the screw tip when hitting the driver bit or hitting the tip of a sharp screw with a hammer, so that the driver bit can be removed and attached safely. It becomes possible.

  Furthermore, according to the invention of claim 2, a mark set to coincide with the mark of the screw tightener is formed by mounting a driver bit on the outer peripheral surface of the small-diameter column body portion at a regular mounting position. Therefore, it is possible to prevent damage to the machine due to excessive striking with a hammer, and it is possible to prevent the occurrence of air leakage and malfunction due to operating the tool while the driver bit is incompletely mounted.

  The purpose of enabling easy removal and installation of the driver bit at the work site is to project the large-diameter collar formed in a large-diameter column shape and one end side of the large-diameter collar in the axial direction. A fixing means configured to fix the tip end portion of the driver bit to the other end side of the large-diameter collar portion. This was achieved by a bit attaching / detaching jig in which a recess for fitting the tip of the driver bit was formed on the end face of the small-diameter column body portion.

  1 and 2 show a bit attaching / detaching jig according to an embodiment of the present invention. FIGS. 1 (a) and 1 (b) are perspective views showing the bit attaching / detaching jig 1 from different directions. FIG. 2 shows the same bit attaching / detaching jig 1 cut along the center line. As shown in each figure, the bit attaching / detaching jig 1 is integrated with a large-diameter collar 2 formed in a large-diameter columnar shape and projecting from one end surface side of the large-diameter collar 2 in the axial direction. It is comprised by the thin diameter pillar part 3 formed in this. As shown in FIGS. 1A and 2, the large-diameter ridge so that the tip of the driver bit can be inserted into the end face of the large-diameter ridge 2 on the side where the small-diameter column body portion 3 is not formed. A fixing means constituted by a fixing hole 4 formed at the center of the end face of the portion 2 and a fixing screw 5 screwed into the fixing hole 4 from the outer peripheral surface of the large-diameter flange portion 2 is formed. The tip of the driver bit is inserted into the fixing hole 4 and the fixing screw 5 is tightened so that the driver bit can be fixed to the bit attaching / detaching jig 1.

  Moreover, as shown in FIG.1 (b) and FIG. 2, the recess 6 for fitting the front-end | tip of the driver bit with which it mounts to a screwing machine is formed in the end surface of the said small diameter column 3 part. The tip of the driver bit is formed with a tip shape for fitting a recess formed in the head of the screw to transmit the rotational force to the screw, and is formed on the end surface of the small-diameter column body portion 3. When the new driver bit is mounted by the recess 6, the tip shape of the driver bit is accommodated so as not to be damaged. The recess 6 is formed by screwing a screw 8 on which a recess suitable for a driver bit to be attached to the attachment portion is formed, into a female screw portion 7 formed on an end surface of the small-diameter column body portion 3. Is exposed to the end face of the small-diameter column body portion 3. Thus, by using the screw 8 suitable for the driver bit, it is possible to mount a driver bit of any size. Further, the outer peripheral surface of the small-diameter column body portion 3 of the bit attaching / detaching jig 1 is set so as to coincide with the mark formed on the screw tightening machine 10 when the driver bit is attached at the regular attachment position. A mark line 9 is formed.

  FIG. 3 shows a screw tightening machine 10 driven by compressed air. The screw tightening machine 10 is an air motor which is driven to rotate by compressed air in a housing 11 in which a grip portion 12 is integrally formed toward the rear side. 13 is housed, and an impact mechanism 16 composed of a hammer 14 rotated by the air motor 13 and an anvil 15 struck and rotated by the hammer 14 is housed below the air motor 13. A rotary drive shaft 17 that is rotationally connected to the anvil 15 of the impact mechanism 16 is housed in a hollow formed at the center of the impact mechanism 16 and the air motor 13 and is slidable in the axial direction.

  A piston 18 is formed at the lower end portion of the rotary drive shaft 17, and this piston 18 is slidably accommodated in a cylinder 19 formed in the lower portion of the impact mechanism 16 in the housing 11. When the compressed air is supplied to the upper surface side of the piston 18 in the cylinder 19, the piston 18 is operated in the direction of the bottom dead center in the cylinder 19 to propel the rotary drive shaft in the axial direction. Yes. A driver bit 20 is attached to the lower end portion of the rotary drive shaft 17, and the driver bit 20 is rotated by rotating the rotary drive shaft 17 by an impact mechanism to rotate the screw, and the rotary drive shaft is rotated by the piston 18. The driver bit 20 drives the screw in the screwing direction by actuating 17 in the direction of the bottom dead center.

  A nose portion 21 for slidingly guiding the driver bit 20 and guiding the screw toward the workpiece is attached to the lower side of the housing 11, and a supply mechanism connected to the rear side of the nose portion 21. Screws are sequentially supplied into the nose portion 21 through 22, the driver bit 20 is rotated by the impact mechanism 16, and is moved toward the tip of the nose portion 21 by the piston 18, thereby being supplied to the nose portion. The driver bit 20 is engaged with the screw, and the screw is rotated and simultaneously pushed toward the tip of the nose portion 21, and the screw is clamped by a pair of chuck mechanisms 23 formed in the nose portion 21. Screwed into the insert. The nose portion 21 can be removed from the housing 11 forming the main body of the screw tightening machine 10 in order to expose the tip portion of the driver bit 20 when the driver bit 20 is attached / detached.

  As shown in FIG. 4, the rotational drive shaft 17 whose outer peripheral surface at the lower end is formed as a piston 18 is slidably disposed along a cylinder 19 that houses the piston 18. A mounting portion 25 for receiving a hexagonal shaft portion 24 formed at the rear end of the driver bit 20 is formed at the lower end portion of the shaft 17. The mounting portion 25 is formed by a concave hole 26 having a hexagonal cross section and opened toward the lower end. The hexagonal shaft portion 24 on the base side of the driver bit 20 is accommodated in the concave hole 26. Thus, the rotation of the rotation drive shaft 17 is transmitted to the driver bit 20.

  Further, a steel ball 28 elastically biased by a bit ring 27 disposed on the outer peripheral surface of the mounting portion 25 so as to advance toward the inside of the concave hole 26 is provided on the mounting portion 25 in a circumferential direction. A plurality of steel balls 28 are arranged at intervals in the direction, and the driver bit 20 is engaged with the annular groove 29 formed on the outer peripheral surface of the hexagonal shaft portion 24 of the driver bit 20, whereby the driver bit 20 is rotated by the rotary drive shaft 17. The mounting portion 25 is held. When the driver bit 20 is mounted or removed, the steel ball 28 is moved radially outward against the elasticity of the bit ring 27 by pressing or pulling the driver bit 20 in the axial direction with respect to the rotary drive shaft 17. It is made to move to.

  Hereinafter, the operation state of attaching / detaching the driver bit 20 to / from the screwing machine 10 using the bit attaching / detaching jig 1 of the above embodiment will be described with reference to FIGS. When removing the driver bit 20 from the screwing machine 10, the nose part 21 is removed from the screwing machine 10 so that the tip of the driver bit 20 can be exposed from the housing 11 as shown in FIG. 5. By pulling the driver bit 20 in this state, the rotary drive shaft 17 on which the piston 18 is formed is moved along the cylinder 19 to the bottom dead center position, and is attached to the mounting portion 25 of the rotary drive shaft 17. The tip of the driver bit 20 can be greatly exposed from the housing 11. As shown in the drawing, the tip of the driver bit 20 is inserted into the fixing hole 4 formed on the end face of the large-diameter collar 2 of the bit attaching / detaching jig 1 and the fixing screw 5 is tightened to tighten the driver bit 20. Fix to the bit attaching / detaching jig 1. In this state, the bit attaching / detaching jig 1 is pulled in the axial direction of the driver bit 20 or, as shown in the figure, the large-diameter flange 2 is hit with a tool T such as a hammer to give an impact to the driver bit 20. It can be easily detached from the mounting portion 25.

  When a new driver bit 20 is mounted, a screw 8 formed with a recess suitable for the size of the driver bit 20 to be mounted is screwed onto the end surface of the small-diameter column body portion 3 of the bit attaching / detaching jig 1. The hexagonal shaft portion 24 at the rear end of the new driver bit 20 is pressed into the recessed hole 26 of the mounting portion 25 of the rotary drive shaft 17 so that the tip of the driver bit 20 is fitted into the recess 6 of the screw 8. As shown in FIG. 6, the rotary drive shaft 17 is operated to the top dead center position in the cylinder 19 through the driver bit 20. Since the upper end surface of the rotary drive shaft 17 is engaged with the upper wall of the housing 11 at this top dead center position, the impact is not propagated to the components such as the cylinder even if an impact is applied to the driver bit. After rotating the bit attaching / detaching jig 1 in this state, the driver bit 20 is rotated to align the driver bit 20 with the hexagonal portion of the rotary drive shaft 17 concave hole 26, and The driver bit 20 is mounted on the mounting portion 25 of the rotary drive shaft 17 by hitting with a hammer from the end surface side on the portion 2 side.

  The small-diameter column body portion 3 of the bit attaching / detaching jig 1 fitted to the driver bit 20 at the position where the driver bit 20 is correctly attached to the attaching portion 25 of the rotary drive shaft 17 arranged at the top dead center position. Since the mark line 9 formed on the side surface of the screw is set so as to coincide with the mark 30 formed on the screwing machine 10, the bit attaching / detaching jig 1 is hit while visually observing the mark line 9 and the mark 30. Thus, it can be confirmed that the driver bit 20 has been inserted to the proper mounting position, and it is possible to avoid giving an unnecessary impact to the driver bit 20 and the rotary drive shaft 17.

  7 and 8 show a usage example in which the bit attaching / detaching jig 1 according to the above-described embodiment is used for attaching / detaching the driver bit 31 having a different shape. FIG. An example of use with a driver bit 31 having an annular groove 32 formed on the surface is shown. The tip of the fixing screw 5 screwed from the outer peripheral surface of the large-diameter collar is engaged with the annular groove 32 of the driver bit 31. By doing so, the driver bit 31 is fixed more reliably. Further, as shown in FIG. 8, an example of use with a driver bit 33 in which the outer diameter of the tip portion of the driver bit 33 is formed larger than the diameter of the shaft portion of the driver bit 33 is shown. By engaging the tip with a jaw 34 formed at the tip of the driver bit 33, the driver bit 33 can be more securely fixed to the bit attaching / detaching jig 1.

  Further, FIG. 9 shows a bit attaching / detaching jig 40 according to another embodiment. The bit attaching / detaching jig 40 according to this embodiment does not use a fixing screw as a fixing means for fixing the driver bit 41, and the driver. A pin hole 43 is formed in a direction perpendicular to the fixing hole 42 formed on the end surface of the large-diameter flange 2 that accommodates the tip end of the bit 41, and the pin 44 penetrated into the pin hole 43 is The driver bit 41 is fixed to the bit attaching / detaching jig 40 by being inserted into a through hole 45 formed in the driver bit 41 inserted into the fixing hole 42.

(A) The perspective view which shows the end surface by the side of an enlarged diameter collar part, (b) The perspective view which shows the end surface by the side of a small diameter column body part of the bit attachment / detachment jig concerning the Example of this invention Vertical side view of the same bit attaching / detaching jig as FIG. Longitudinal side view showing a screw tightener driven by compressed air FIG. 3 is a detailed vertical side view showing a mounting portion of the driver bit of the screw tightener of FIG. Longitudinal side view showing the state where the driver bit is removed from the screw tightener Longitudinal side view showing the state where the driver bit is attached to the screw tightener Sectional view of the bit attachment / detachment jig with other shape driver bits fixed Sectional view of a bit attachment / detachment jig with another shape driver bit fixed Sectional drawing longitudinal side view which shows the bit attachment / detachment jig concerning other Examples

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bit attachment / detachment jig 2 Large diameter collar part 3 Small diameter column part 4 Fixing hole 5 Fixing screw 6 Recess 8 Screw 9 Marking line 10 Screwing machine 17 Rotation drive shaft 25 Mounting part 20, 31, 33 Driver bit

Claims (2)

  A large-diameter collar part formed in a large-diameter columnar shape and a small-diameter column having a smaller diameter than the large-diameter collar part integrally formed by protruding from one end side of the large-diameter collar part in the axial direction The body is formed with a fixing means that can fix the tip of the driver bit to the other end of the large-diameter collar, and the tip of the driver bit is fitted to the end surface of the small-diameter column body A tool for attaching and detaching a bit for a screw tightening machine, wherein a recess for forming the screw is formed.   The mark set up so that it may correspond with the mark of a screw fastening machine was formed in the outer peripheral surface of the said thin diameter column body part by attaching a driver bit in a regular mounting position. Bit jig for screw tightening machine.

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