JP4400828B2 - Bolt supply device - Google Patents

Description

  The present invention relates to a bolt supply device used in a tightening tool or the like.

A bolt supply port is provided on the side of the tip of the cylindrical member in which the tightening shaft advances and retreats inside, a guide pipe for the bolt is provided swingably here, and a bolt supplied from the side is provided on the tip side of the slide cylinder Insert the screw part inside the bolt gripping part first, advance the rotating tightening shaft, swing the guide pipe substantially horizontally to close the bolt supply port, and then further advance the screw part of the bolt Is supported by the bolt gripping part, and the head is fitted to the tip of the fastening shaft to fix the bolt. Subsequently, a bolt supply device is known in which a bolt is tightened by inserting the tip of a screw portion of a bolt into a screw hole of a fastened portion and further advancing a tightening shaft to widen the bolt gripping portion (patent) Reference 1). In addition, it is also known that a claw portion is provided at the tip of the tightening shaft, the screw portion of the bolt is first gripped, and then the bolt is fastened while gripping the head portion (see Patent Document 2 as an example).
JP-A-8-47867 JP-A-6-91538

By the way, in the case of the above-mentioned patent document 1, if the bolt is held by the bolt gripping portion, the temporarily fixed state until it is fixed by the advanced tightening shaft is unstable, and a lateral orientation or the like that makes the tightening direction substantially horizontal is used. The bolt is easy to fall off from the bolt gripping part. However, since the tightening shaft advances relatively slowly, it takes time to fix the bolt after the guide pipe is swung substantially horizontally, and the temporarily fixed state is lengthened. Therefore, it is required to stably support the bolt by shortening the temporarily fixed state.
In addition, in the case of Patent Document 2, the temporarily fixed state can be eliminated, but the structure of the claw portion becomes complicated, and the entire apparatus becomes large and expensive, such as requiring an air cylinder for this purpose. In addition, it becomes a dedicated machine, and a commercially available fastening tool such as a known impact driver cannot be easily used. Therefore, these solutions are also desired. Therefore, the present application aims to realize these requirements.

In order to solve the above-mentioned problems, according to the bolt supply device of the present invention, the invention of claim 1 is attached to a tightening tool having a tightening shaft having a socket portion for fitting the head portion of the bolt, and the tightening shaft is arranged inside. in volt supply apparatus comprising a cylindrical member for accommodating the head of the bolt which is supplied to the tip portion of the cylindrical member to fit into the socket portion into,
The cylinder member includes an outer cylinder portion and a slide cylinder that is movable forward and backward with respect to the outer cylinder portion, and the slide cylinder is opened at a side surface of the distal end portion thereof, and is opened when the slide cylinder is advanced and closed when the slide cylinder is retreated An openable / closable bolt gripping portion provided at the tip of the slide cylinder is provided to hold the screw portion of the bolt supplied to the inside from the bolt supply port, and the bolt gripping portion is closed to temporarily fix the screw portion of the bolt. It can be stopped and the bolt is released when it is opened.
Furthermore, an operating air chamber is provided between the outer cylinder part and the slide cylinder, the slide cylinder is urged in a backward direction by a spring against the outer cylinder part, and the operating air chamber is pressurized with air to thereby spring the slide cylinder. The slide cylinder is moved backward with respect to the outer cylinder part by the spring when the air is exhausted from the outer cylinder part against the pressure, and the air in the working air chamber is exhausted and depressurized.
When the bolt is supplied from the bolt supply port to the inside of the bolt gripping portion, the slide cylinder moves forward against the spring by pressurization of the working air chamber, and the bolt supply port is more than the socket portion. When moving to the front position , the bolt is supplied from the bolt supply port into the bolt gripping part in front of the socket part with the screw part first, and the screw part of the bolt is temporarily fixed by the bolt gripping part,
After that, when the slide cylinder is retracted due to the decompression of the working air chamber , the bolt gripping part is retracted together with the slide cylinder, and the tip of the socket part enters the inside of the bolt gripping part and is temporarily fixed. The head is fitted to the tip of the socket part , and the bolt is protruded forward from the bolt gripping part and fastened.

  According to a second aspect of the present invention, in the first aspect of the present invention, the elasticity of the spring changes stepwise so that the spring exhibits different urging forces in the temporarily fixed state and in the bolt protruding time.

According to a third aspect of the present invention, in the first aspect, the cylindrical member is provided so as to be relatively movable inwardly with respect to the slide cylinder, and moves and guides the fastening shaft while preventing rotational shaking of the shaft core. The guide cylinder is separated from the slide cylinder when the bolt is temporarily fixed, and is not retracted, and its tip is positioned inside the bolt gripping portion to fix the bolt in the temporarily fixed state. While letting
Then, it is retracted together with the slide cylinder, and the socket part is brought into contact with the bolt gripping part to push it open.

  According to a fourth aspect of the present invention, in the third aspect, the spring includes a first spring that biases the slide cylinder in the backward direction, and a second spring that biases the guide cylinder in the forward direction. Is in contact with the guide cylinder when it is retracted by a predetermined amount, and the elasticity of the first spring overcomes the elasticity of the second spring and retracts together with the guide cylinder.

According to a fifth aspect of the present invention, in the third aspect , the slide cylinder and the guide cylinder, and an outer cylinder portion that holds the slide cylinder and the guide cylinder so as to be freely movable back and forth, are integrated into a unit. It is characterized in that it is detachably attached to the tightening tool.

  According to the first aspect of the present invention, the slide cylinder is movable relative to the tightening shaft and is urged in the backward direction by the spring and is moved forward against the spring. By setting the position in front of the bolt, the bolt can be supplied from the bolt supply port to the inside of the bolt gripping portion, and the screw portion of the bolt can be temporarily fixed by the bolt gripping portion.

After that, when the slide cylinder is retracted by the spring, the slide cylinder is urged by the spring and quickly retracts, and the tip of the relatively advancing socket portion quickly enters the inside of the bolt gripping portion to fit the bolt head. Fix together.

Therefore, the shorter the time until the fixing of the bolts, can be fixed without falling off the bolts temporarily fixed state. As a result, it is possible to supply the bolts in the lateral direction, the posture of the fastening device at the time of fastening can be varied, and the degree of freedom of fastening work can be increased. In addition, one-handed operation is possible because there is no need to hold the bolt by hand. In addition, since the bolt is gripped and fastened by moving the slide cylinder side with a spring bias, the structure for gripping the bolt can be made relatively simple.

  According to the second aspect of the present invention, since the elasticity of the spring is changed stepwise so as to show different urging forces in the temporarily fixed state and the bolt protruding state, the slide cylinder is rapidly retracted in the temporarily fixed state. In the subsequent fastening operation, the fastening operation can be facilitated by retracting relatively slowly.

According to the invention of claim 3, since the cylindrical member has a two-stage structure of the slide cylinder and the guide cylinder accommodated inside thereof, the movement of the cylinder member is performed by the single movement of only the slide cylinder at the time of temporary fixing, and thereafter The slide cylinder and the guide cylinder can be moved together. Therefore, when the temporary stop of the bolt is configured to guide the relative movement of the socket portion, leaving the guide tube, by placing the tip of the guide tube to the inside of the bolt grasping portion, the bolt being closed bolt supply port head Can be fixed.

  In addition, the guide tube guides the movement of the tightening shaft and prevents the shaft core from rotating. Therefore, the bolt head can be accurately and quickly fitted to the tip of the tightening shaft.

  Furthermore, by subsequently moving the slide cylinder and the guide cylinder back together, it is possible to project the bolt by the socket portion and facilitate the fastening operation. In addition, the two-stage structure in which the cylindrical member is fitted inside and outside allows the bolt supply portion to be made compact.

  According to the invention of claim 4, since the spring is constituted by the first and second springs, the slide cylinder is urged in the backward direction by the first spring, and the guide cylinder is urged in the forward direction by the second spring. Until the slide cylinder is retracted by a predetermined amount, only a relatively large elastic force of the first spring acts to rapidly retract the slide cylinder, and the unstable temporary fixing state of the bolt can be completed in a short time.

  Thereafter, since the slide cylinder moves backward in conjunction with the guide cylinder, the elasticity of the second spring works in the opposite direction, and the elasticity of the first spring that causes the slide cylinder and the guide cylinder to move backwards in the opposite direction. It becomes smaller by the elasticity of the working second spring, and is moved backward by a relatively weak force. For this reason, the bolt fixing by the guide tube can be continued for a relatively long time, and the support of the bolt can be ensured.

  According to the invention of claim 5, a commercially available clamping tool in which a slide cylinder and a guide cylinder and an outer cylinder part that holds these cylinders so as to be movable back and forth are integrated, and this unit is provided with a clamping shaft. Since it can be detachably attached, it can be easily attached to a commercially available fastening tool, and a commercially available fastening tool can be easily used.

  Hereinafter, an embodiment will be described based on the drawings. FIG. 1 shows a state in which a bolt automatic supply unit 2 according to the present invention is attached to an impact driver 1 which is a commercially available fastening tool. Reference numeral 1a denotes a head portion that supports the chuck 1b of the impact driver 1, and 24 denotes an attachment that can be attached to and detached from the chuck 1b. Reference numeral 25 denotes a socket portion formed at the tip of the attachment, and 1c denotes an operation switch, which intermittently supplies high-pressure air supplied from the air hose 1d to rotate or stop the chuck 1b. 1e is a grip.

  In addition, in this application, the front means the fastening direction of a volt | bolt, and an advancing / retreating direction corresponds with the front-back direction. The vertical direction is based on FIGS. 1 and 2, and the horizontal direction is based on the illustrated states of FIG. 4.

  The automatic bolt supply unit 2 includes a main body fixing portion 3 that is fixed to the impact driver 1, an outer cylinder portion 4 that protrudes forward integrally from the main body fixing portion 3, and a slide cylinder 5 that is movable forward and backward with respect to the outer cylinder portion 4. In addition, a bolt gripping part 6, a fixed pipe 7 and a movable pipe 8 are provided at the tip of the slide cylinder 5.

  The fixed pipe 7 and the movable pipe 8 are guide pipes for supplying the bolts 12 to the bolt gripping part 6, and are divided into two parts, a fixed part and a movable part. The movable pipe 8 is swingably attached by a screw 10 to a portion protruding upward of a mounting portion 9 provided integrally with the side surface of the tip of the slide cylinder 5, and is provided with an inclined supply state and a substantially horizontal supply stop state. Swing between.

  The fixed pipe 7 is screwed to the inclined upper end portion of the attachment portion 9 and attached obliquely, and the feed pipe 11 is connected to the end portion protruding upward. Bolts 12 are supplied to the feed pipe 11 from a bolt feeder (not shown) while being fed into pressurized air with the thread portion down.

  The bolt gripping part 6 is divided into left and right parts, and the respective rear end parts are attached to the lower side surface of the attaching part 9 by screws 13 so as to be freely opened and closed. Reference numeral 14 denotes an operating air pipe, which communicates with a through hole 4 c provided on the rear side of the outer cylinder portion 4. Reference numeral 15 denotes a switch cord. In addition, this figure has shown the fastening operation state of the horizontal attitude | position which made the volt | bolt 12 substantially horizontal.

  FIG. 2 shows a cross section along the longitudinal direction of the bolt automatic supply unit 2 in a bolt supply start state at the time of non-tightening, and FIG. 3 is an exploded view showing each component. In these drawings, the rear end portion 4a of the outer cylinder portion 4 is fitted to the outside of the front protruding portion 3a formed at the front portion of the main body fixing portion 3, and the main body fixing portion 3 and the outer cylinder portion 4 are automatically supplied with bolts. The outer fixed portion of the unit 2 is formed.

  The slide cylinder 5 is fitted on the rear side so as to be movable forward and backward with respect to the outer cylinder part 4, and is urged by the first spring 16 in the backward direction. Reference numeral 5a denotes a rear end portion thinned by increasing the inner hole diameter, and 5b denotes a stepped portion formed between the thin rear end portion 5a and the thicker main body portion 5c side.

A guide cylinder 17 is fitted inside the slide cylinder 5 so as to be relatively movable.
The guide cylinder 17 has a function of preventing the rotation of the axis of the fastening shaft described later.

  The rear end portion 17a of the guide tube 17 has an outer flange shape, and is located on the rear side of the inwardly protruding stopper 4b formed in the vicinity of the rear end portion 4a of the outer tube portion 4, and is located inside the front protrusion portion 3a. It can be moved forward and backward. The rear end portion 17a is urged to move forward by the second spring 18 and is pressed against the stopper 4b to stop the forward movement. Reference numeral 17b denotes a rear part having a large diameter, 17c denotes a step part between the rear part 17b having a large diameter and a main body part 17d having a small diameter, and 17e denotes a front end.

  A seal 19 also serving as a spring receiver is provided at the rear end of the slide cylinder 5 so as to be airtightly slidably contacted with the inner surface of the outer cylinder portion 4. The seal 19 is surrounded by the outer cylinder portion 4, the stopper 4 b and the guide cylinder 17. The working air chamber 20 is connected to one end of the working air pipe 14 through the through hole 4c, and the working air chamber 20 is pressurized by supplying high-pressure working air from the working air pipe 14.

  On the contrary, the supply of high-pressure working air to the working air pipe 14 is stopped, and the working air in the working air chamber 20 is exhausted to the outside through the through-hole 4c and the working air pipe 14 by the release of the atmosphere or the like. Is opened to the atmosphere or depressurized (hereinafter simply referred to as depressurization).

  A first spring 16 is disposed in the working air chamber 20, and when the working air chamber 20 is pressurized, it is compressed between the cap 4 d attached to the tip of the outer cylinder portion 4 and the seal 19 by this air pressure. It is in the most contracted state, and at the time of decompression, it is elastically restored and becomes fully extended. Moreover, the slide cylinder 5 at this time is rapidly retracted by the restoring force of the first spring 16.

  Therefore, when the inside of the working air chamber 20 is pressurized, the slide cylinder 5 moves forward while compressing the first spring 16, and when the pressure is reduced, the slide cylinder 5 is moved to the last retracted position by the restoring force of the first spring 16. Move to. For this reason, the slide cylinder 5 can be moved forward and backward by adjusting the air pressure in the working air chamber 20.

 When the slide cylinder 5 is in the most advanced position, the guide cylinder 17 is also pushed forward by the second spring 18, and the rear end portion 17a is in the most advanced position where it abuts against the stopper 4b. The front end 17e is located in the vicinity of the mounting portion 9, and is located in the vicinity of the bolt supply port 22 formed on the upper side surface of the front end portion of the slide cylinder 5.

  The movable pipe 8 enters the bolt supply port 22 in an inclined supply state so as to be coaxial with the fixed pipe 7. The swinging spring 23 is provided between the mounting portion 9 and the movable pipe 8, and if the movable pipe 8 is rotated counterclockwise in the figure against the swinging spring 23, a substantially horizontal supply stop state is obtained. If it is made free, the movable pipe 8 is rotated clockwise by restoring elasticity, and is oscillated and biased toward the supply state shown in the figure.

  A proximity switch 21 provided in the outer cylinder portion 4 is provided at the tip of the switch cord 15 so as to face the working air chamber 20, and detects the backward movement of the rear end portion 5 a of the slide cylinder 5. When the slide cylinder 5 moves backward and the rear end 5a moves to the last retracted position, this is detected and a signal is sent to the air signal output unit (not shown) via the switch cord 15.

  The air signal output unit includes a timer. When a detection signal from the proximity switch 21 is input, the air signal output unit delays a predetermined time to generate an air supply start signal, supplies a bolt from the bolt feeder, and supplies air to the feed pipe 11 and the working air pipe 14. Start supply and pressurize air.

  The delay time by the timer is set so that the tip of the tool can be reliably separated from the tightened part to the non-contact position after the tightening is completed, and the next bolt is supplied immediately after the tightening to collide with the tightened part. There is nothing to do.

  The air signal output unit also outputs an air stop signal, and stops supplying air to the bolt feeder and the working air pipe 14 when a predetermined time has elapsed after the start of air supply. The output timing of the air stop signal is determined in consideration of the time required until the bolt supplied from the bolt feeder via the feed pipe 11 is temporarily fixed, and is set by a timer.

  Reference numeral 24 in the figure denotes an attachment corresponding to a tightening shaft of the impact driver 1, one end of which is detachably attached to the chuck 1b, the other end forms a socket portion 25, and the head of the bolt 12 is fitted. A hexagonal recess is formed. The attachment 24 is rotationally driven by the chuck 1b and can fasten the bolt 12 fitted in the socket portion 25 to the member to be tightened.

  4 is a top view of the bolt gripping portion 6, FIG. 5 is a front view thereof, FIG. 6 is a side view, and FIG. 7 is a view with the bolt gripping portion 6 omitted in FIG. As shown in these drawings, a tightening shaft passage 27 penetrating in the longitudinal direction is provided inside the slide cylinder 5, and its front end is opened upward (FIG. 7), and the bolt supply port 22 (FIG. 4). Communicating with

  The distal end side of the movable pipe 8 is swingable inside the tightening shaft passage 27 (FIGS. 5 and 7). As shown in FIG. 6, a screw 10 is provided on the upper part of the movable pipe 8 so as to protrude outward, and is passed through a notch 9b cut obliquely downward from an upper end inclined part 9a of the attachment part 9 to be a nut. It is attached at 28. The upper portion of the cutout portion 9b is covered with a part of the fixed pipe 7 attached to the upper end inclined portion 9a with a screw 9c.

  The screw 10 forms a swing center axis in the vertical swing of the movable pipe 8, and a coiled swing spring 23 is disposed around the screw 10. The left and right oscillating springs 23 are continuous across the movable pipe 8 to oscillate the movable pipe 8. The fixed ends of the left and right swing springs 23 are respectively attached to the attachment portion 9.

  As shown in FIG. 5, the bolt gripping portion is provided with a mounting arm portion 30 that extends rearward, and its rear end portion is fitted into a mounting recess 29 formed in the lower portion of the mounting portion 9. They are connected by a vertical screw 13 fastened from the bottom side.

  As shown in FIG. 7, the mounting recess 29 is formed to be opened laterally on the lower side of the left and right mounting portions 9, and the mounting arm portion 30 fitted therein is rotatable around the screw 13, As shown in FIG. 4, it is attached so that it can be opened and closed sideways.

  As shown in FIG. 6, the bolt gripping part 6 is composed of half bodies 6a and 6b divided into left and right sides, and a hole 31 formed from left and right semicircular recesses is provided at the center of the tip, from which a bolt screw is formed. The part is projected. The periphery of the hole 31 forms a slope portion 32 that gradually increases in diameter toward the rear. The inner surface of the inclined surface portion 32 forms a guide surface for guiding the bolt 12 to the hole 31 (see FIG. 2).

  The half bodies 6 a and 6 b are attached to the front end side surface of the slide cylinder 5 so as to be openable and closable, and are biased in the closing direction by a torsion coil spring 33. The torsion coil spring 33 is formed by winding coil portions formed at both ends in the length direction of the wire around the screw 13 and bending the intermediate portion between both coil portions in a loop shape so as to contact the side surfaces of the half bodies 6a and 6b. Both ends are in contact with the slide cylinder 5. 4, when the socket portion 25 relatively moves forward, the front end of the socket portion 25 pushes the slope portion 32 and opens it against the torsion coil spring 33 to open it to the left and right. The front end of 25 and the bolt 12 fitted therein are projected forward from the bolt gripping portion 6.

  As shown in FIG. 4, in the closed state of the halves 6 a and 6 b, an open part 34 that is continuous with the bolt supply port 22 is formed on the upper surface, and the movable pipe part 8 is connected to the bolt gripping part 6 through the open part 34. It swings so that it can enter and leave the inner space. In addition, the edge part of the open part 34 comprises the stopper surface 35 of the slope which inclines backward, and the front-end | tip part of the movable pipe part 8 at the time of a supply state contact | abuts here, and it stops rocking | fluctuation (FIG. 5). .

  FIG. 8 shows a cross section of the main body fixing portion 3, and the head portion 1 a of the impact driver 1 is fitted into the hole 3 b provided in the main body fixing portion 3, and a nut orthogonal to the slit 36 crossing the hole 3 b. By inserting and fastening the bolt 38 into the hole 37, the impact driver 1 is detachably attached and integrated.

  Next, the operation will be described. First, as shown in FIG. 1, when the use of the apparatus is started with the impact driver 1 turned sideways, an air supply start signal is output by an air signal output unit (not shown), and the bolt feeder and the working air pipe 14 are output. Start the pressurized air source. As a result, as shown in FIG. 2, the working air is automatically supplied from the working air pipe 14 to the working air chamber 20 to be pressurized, and the slide cylinder 5 is moved to the most advanced position against the first spring 16. As a result, the leading end positions of the guide tube 17 and the socket portion 25 are relatively retracted, and the bolt supply port 22 is opened.

  For this reason, the movable pipe 8 swings in the clockwise direction in the figure, and the front end side enters inward from the bolt supply port 22 and is inclined coaxially with the fixed pipe 7. In this state, one bolt 12 is supplied into the feed pipe 11, and while being pumped by pressurized air, it passes through the movable pipe 8 from the fixed pipe 7 and falls diagonally to the inside of the bolt gripping portion 6 with the threaded portion first. To do.

  Since the dropped bolt 12 comes into contact with the inclined surface portion 32 at the tip of the screw portion, it is gradually pushed sideways while being pushed by the pressurized air fed from the feed pipe 11 and guided to the inclined surface portion 32 of the bolt gripping portion 6. Eventually, the screw portion protrudes outward from the hole 31 and is temporarily held by the bolt gripping portion 6. FIG. 2 shows each state from the bolt supply start state to the temporary holding.

  9 shows a bolt fixing state following the bolt temporary fixing state of FIG. When the bolt 12 is temporarily fixed by the bolt gripping portion 6, the working air for the working air pipe 14 is stopped after a predetermined time, and the working air in the working air chamber 20 is removed from the through hole 4 c and the working air pipe 14. The working air chamber 20 is depressurized by exhausting to the outside. As a result, the first spring 16 is restored and extended.

  Since the slide cylinder 5 is rapidly retracted by the restoring elasticity of the first spring 16, the leading ends of the guide cylinder 17 and the socket portion 25 are relatively advanced to swing the movable pipe 8 counterclockwise to supply bolts. At the same time as being taken out from the port 22 and made substantially horizontal, the bolt supply port 22 is closed and the bolt gripping part 6 is entered. As a result, the bolt 12 temporarily fixed to the bolt gripping portion 6 is prevented from falling off and is temporarily held.

  At this time, the guide cylinder 17 moves forward in place of the retreating slide cylinder 5, and the bolt supply port 22 can be closed to maintain the temporarily fixed state of the bolt 12. Since the guide cylinder 17 has a function of preventing the shaft 24 of the attachment 24 and the socket portion 25 from swinging, the head of the bolt 12 is almost simultaneously with the temporary fixing with respect to the socket portion 25 which is accurately guided without being shaken by the guide cylinder 17. The part fits quickly.

  FIG. 10 shows a fastening state, and the fastening operation is started by inserting the screw portion of the bolt 12 held in FIG. 9 into a screw hole of a member to be fastened (not shown). At this time, even if the posture of the impact driver 1 is changed, the bolt 12 does not fall off and is securely held. Simultaneously with this fastening, the slide cylinder 5 continues to retreat due to the restoration of the first spring 16, and when the stepped portion 5 b comes into contact with the stepped portion 17 c of the guide tube 17, the guide tube 17 is brought together against the second spring 18. Retreat to.

  For this reason, the slide cylinder 5 and the guide cylinder 17 are further retracted relative to the socket portion 25, the socket portion 25 moves forward, and the tip thereof abuts against the slope portion 32, which resists the torsion coil spring 33. Then, it is spread to the left and right, and the front end side of the socket portion 25 protrudes forward from the bolt gripping portion 6 and the bolt 12 is released from the bolt gripping portion 6 to complete the fastening.

  At this time, the slide cylinder 5 and the guide cylinder 17 are in the last retracted position, and the stepped portion 17c comes into contact with the shoulder portion of the chuck 1b to stop the backward movement. Therefore, when the operation switch 1c is released to stop the rotation of the attachment 24 and the socket portion 25 is released from the bolt 12, the fastening operation is completed. Further, the proximity switch 21 detects the last retracted state of the slide cylinder 5 and stops supplying the working air to the bolt feeder and the working air pipe 14 until a predetermined delay time set by the timer.

  In this state, since there is no supply of working air to the working air pipe 14, the relative positions of the outer cylinder part 4, the slide cylinder 5, the guide cylinder 17 and the socket part 25 remain in the illustrated state, and the movable pipe 8 also maintains the supply stopped state. To do. Thereafter, when a predetermined time elapses, supply of operating air to the bolt feeder and the operating air pipe 14 is started, and the state returns to the state of FIG. 2 again. Hereinafter, by repeating this, the fastening operation can be performed while automatically supplying the bolts.

  In this way, the slide cylinder 5 is movable relative to the attachment 24 and is urged in the backward direction by the first spring 16 and is moved forward against the first spring 16, and the bolt supply port 22. The bolt 12 can be supplied to the inside of the bolt gripping portion 6 from the bolt supply port 22 by temporarily setting the screw portion of the bolt 12 at the bolt gripping portion 6. Can do.

  Thereafter, when the slide cylinder 5 is retracted by the first spring 16, the slide cylinder 5 is spring-biased and rapidly retracts so that the relatively advancing socket portion 25 exits from the bolt supply port 22. Is swung to close the bolt supply port 22, and the tip of the socket portion 25 quickly enters the inside of the bolt gripping portion 6 to fit and fix the head of the bolt 12.

  For this reason, the time from the swing of the movable pipe 8 to the fixing of the bolt 12 is shortened, and the temporarily fixed bolt 12 can be fixed without dropping off. As a result, it is possible to supply the bolts in the lateral direction, the posture of the fastening device at the time of fastening can be varied, and the degree of freedom of fastening work can be increased. Moreover, since it is not necessary to hold down the bolt 12 by hand, one-handed work is possible. In addition, since the bolt is gripped and fastened by spring-biasing the slide cylinder 5 side, the structure for gripping the bolt can be made relatively simple.

  Further, since the cylindrical member has a two-stage structure of the slide cylinder 5 and the guide cylinder 17 accommodated inside thereof, the movement of the cylinder member is the single movement of only the slide cylinder 5 at the time of temporarily fixing the bolt (FIG. 9), It can be changed to the integral movement (FIG. 10) of the slide cylinder 5 and the guide cylinder 17 after that.

  For this reason, at the time of temporarily fixing the bolt, the guide cylinder 17 remains in the advanced state, and the temporarily fixed state of the bolt 12 can be maintained by the tip 17 e of the guide cylinder 17. Further, since the guide cylinder 17 prevents the shaft 24 of the attachment 24 and the socket part 25 from swinging, when the socket part 25 enters the inside of the bolt gripping part 6, the head of the bolt 12 is quickly fitted into the socket part 25. Can be fixed.

  Thereafter, by sliding the slide cylinder 5 and the guide cylinder 17 together, the socket 12 can be protruded by the bolt 12 and the fastening operation can be facilitated. In addition, since the movable side cylinder member of the automatic bolt supply unit 2 has an internal / external double structure of the slide cylinder 5 and the guide cylinder 17 and has a two-stage expansion / contraction type, the entire automatic bolt supply unit 2 can be made compact.

  Furthermore, the spring for moving the movable side cylinder member of the automatic bolt supply unit 2 is constituted by the first spring 16 and the second spring 18, and the first cylinder 16 urges the slide cylinder 5 in the backward direction. Since the guide cylinder 17 is urged in the forward direction by the two springs 18, only the relatively large elasticity of the first spring 16 acts and the slide cylinder 5 is rapidly retracted until the slide cylinder 5 is retracted by a predetermined amount. The temporary fastening state of the bolt can be completed in a short time.

  Thereafter, since the slide cylinder 5 moves backward in conjunction with the guide cylinder 17, the elastic force of the second spring 18 acts in the opposite direction, and the first spring 16 that moves the slide cylinder 5 and the guide cylinder 17 together moves backward. The elasticity is reduced by the elasticity of the second spring 18 acting in the opposite direction, and is retracted with a relatively weak force. For this reason, the fixing of the bolt 12 by the guide cylinder 17 can be continued for a relatively long time, and the support of the bolt 12 can be ensured.

  In addition, since the elasticity of the spring that moves the movable side cylinder member of the automatic bolt supply unit 2 changes stepwise so as to show different urging forces between the temporarily fixed state and the bolt protruding state, Sometimes the slide cylinder 5 can be retracted rapidly, and the subsequent tightening operation can be retracted relatively slowly to facilitate the fastening operation.

  Moreover, the automatic bolt supply unit 2 is formed by integrating the slide cylinder 5 and the guide cylinder 17 and the outer cylinder portion 4 and the like that hold the slide cylinder 5 and the guide cylinder 17 so as to be able to move forward and backward, and the bolt 24 is attached to the attachment 24. Since the main body fixing part 3 integrated with the outer cylinder part 4 is detachably attached to the head part 1a of the impact driver 1 which is a commercially available fastening tool, it can be easily attached to the impact driver 1 which is a commercially available fastening tool. It can be used, and the entire apparatus can be configured to be relatively light and inexpensive. Moreover, a commercially available fastening tool can be used easily.

  In addition, it can replace with an impact driver and can utilize for an electric motor type driver etc. Moreover, you may integrate previously, without necessarily attaching to a commercially available clamping tool.

Usage state diagram Longitudinal sectional view of the automatic bolt supply unit Exploded view of the components of the automatic bolt supply unit Top view of the bolt grip Front view of bolt grip Side view of bolt grip The figure which abbreviate | omits a bolt holding part from the state of FIG. Cross section of the body fixing part The figure which shows the bolt temporary stop state The figure which shows the state at the time of fastening

Explanation of symbols

1: impact driver, 2: bolt automatic supply unit, 5: slide cylinder, 6: bolt gripping part, 7: fixed pipe, 8: movable pipe, 12: bolt, 16: first spring, 18: second spring, 20 : Working air chamber, 22: Bolt supply port, 24: Attachment, 25: Socket part

Claims (5)

Comprising a tubular member which is attached to the fastening tool having a fastening shaft having a socket portion for fitting the bolt head accommodating the shaft with the clamping inwards, bolt head of which is supplied to the tip portion of the cylindrical member In the bolt supply device in which the part is fitted to the socket part ,
The cylinder member includes an outer cylinder portion and a slide cylinder that is movable forward and backward with respect to the outer cylinder portion, and the slide cylinder is opened at a side surface of the distal end portion thereof, and is opened when the slide cylinder is advanced and closed when the slide cylinder is retreated An openable / closable bolt gripping portion provided at the tip of the slide cylinder is provided to hold the screw portion of the bolt supplied to the inside from the bolt supply port, and the bolt gripping portion is closed to temporarily fix the screw portion of the bolt. It can be stopped and the bolt is released when it is opened.
Furthermore, an operating air chamber is provided between the outer cylinder part and the slide cylinder, the slide cylinder is urged in a backward direction by a spring against the outer cylinder part, and the operating air chamber is pressurized with air to thereby spring the slide cylinder. The slide cylinder is moved backward with respect to the outer cylinder part by the spring when the air is exhausted from the outer cylinder part against the pressure, and the air in the working air chamber is exhausted and depressurized.
When the bolt is supplied from the bolt supply port to the inside of the bolt gripping portion, the slide cylinder moves forward against the spring by pressurization of the working air chamber, and the bolt supply port is more than the socket portion. When moving to the front position , the bolt is supplied from the bolt supply port into the bolt gripping part in front of the socket part with the screw part first, and the screw part of the bolt is temporarily fixed by the bolt gripping part,
After that, when the slide cylinder is retracted due to the decompression of the working air chamber , the bolt gripping part is retracted together with the slide cylinder, and the tip of the socket part enters the inside of the bolt gripping part and is temporarily fixed. The bolt supply device characterized in that the head of the socket is fitted to the tip of the socket part , and the bolt is protruded forward from the bolt gripping part and fastened. The bolt supply device according to claim 1, wherein the elasticity of the spring changes stepwise so as to show different urging forces in the temporarily fixed state and in the bolt protruding time. The cylinder member is provided with the slide cylinder and a guide cylinder that is provided so as to be relatively movable inwardly and that guides the clamping shaft while preventing rotation of the shaft core. In addition, when the bolt is temporarily fixed, the slide cylinder is not separated and retracted, and the tip portion is positioned inside the bolt gripping portion to fix the temporarily fixed bolt,
Thereafter, pre-retracted with kiss ride cylinder, volt supply apparatus according to claim 1, characterized in that the socket part has to push open it by contact to said bolt grasping section. The spring includes a first spring that urges the slide cylinder in the backward direction and a second spring that urges the guide cylinder in the forward direction, and the slide cylinder contacts the guide cylinder when the slide cylinder is retracted by a predetermined amount. 4. The bolt supply device according to claim 3, wherein the elasticity of the first spring overcomes the elasticity of the second spring and moves backward together with the guide cylinder. The slide cylinder, the guide cylinder, and an outer cylinder part that holds these slide cylinders so as to be movable back and forth are integrated into a unit, and the unit is detachably attached to a commercially available clamping tool having the clamping shaft. The bolt supply device according to claim 3 .

Images