JP2015182146A - Screw automatic feeder in automatic driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw automatic feeder in an automatic driver that can make the automatic feed of a machine screw the shank length of which is smaller than the diameter dimension of the head to a bit tip of the automatic driver smoother, rapid, secure, and simple in the case of automatically feeding the screw to the automatic driver and significantly enhance an efficiency of screw tightening.SOLUTION: A screw feeding pipe 40A is provided which consists of a cylindrical flexible tube provided with a screw guide through-hole 42 consisting of a screw head guide through-hole part 43 flatly shaped to guide a screw head Sa and a screw shank guide through-hole part 44 narrowly shaped to the shank part by crossing the screw head guide through-hole part in cross sectional T, and which forms an inner face corresponding to an outer shape of the tube of the screw head guide through-hole part 43 into an arch type curved inner face 43a.

Description

  The present invention relates to an automatic screw supply device capable of automatically supplying and mounting a screw to a bit tip portion of an automatic screwdriver, and in particular, continuously supplying a small screw while maintaining its directionality. The present invention relates to an automatic screw supply device in an automatic screwdriver that can quickly and surely attach a small screw to a bit tip of an automatic screwdriver and can stably and efficiently perform screw tightening work by the automatic screwdriver.

  Conventionally, as an automatic driver equipped with this type of automatic screw supply device, an electric screwdriver main body, a rotating bit whose tip is rotated by the electric screwdriver main body, and an adsorption guide that surrounds the rotating bit and extends. A catcher body surrounding the tip portion of the suction guide, an outer cylinder fixed to the upper part of the catcher body, an inner cylinder fixed to the electric driver main body assembled to the outer cylinder, and formed in the inner cylinder A first and a second chamber defined in the outer cylinder by a piston portion sliding on the inner surface of the outer cylinder, a mechanism for selectively adding fluid to the first and second chambers, and the catcher body A screw supply mechanism that communicates with the opening of the tip of the suction pipe, wherein the suction guide is slidable in the axial direction with respect to the inner cylinder, and one of the first and second chambers is provided. When pressed, first the outer cylinder, bis supply mechanism with driver that to be raised together with the rotary bit and the suction guide has been proposed (see Patent Document 1).

  The screw supply mechanism-equipped driver described in Patent Document 1 includes a screw holding catcher at a tip end opening of the catcher main body and a screw automatic supply pipe communicating with the tip end opening of the catcher main body at an upper portion of the catcher. And a screw fall prevention claw that pivotally supports the base of the catcher body so that the free end is interposed in the passage of the screw automatic supply pipe in the opening of the tip of the catcher body. A screw supply mechanism having the above-described configuration is provided.

  However, in the screw supply screwdriver described in Patent Document 1, when the screw to be applied is not a magnetic material, for example, a screw made of a material such as aluminum, brass, plastic, porcelain, etc., when tightening the screw. When the tip of the rotating bit protrudes a sufficient length from the lower end of the lower tubular part of the suction guide, the screw cannot be held by suction at the tip of the rotating bit, making it difficult to tighten the screw. There is.

  Accordingly, the screw supply mechanism-equipped screwdriver not only has the disadvantage that it cannot be used at all for screws other than the screws made of magnetic material, but even if the screw is made of magnetic material, this acts on the tip of the rotating bit. Since the rotating bit is continuously rotating, the holding state of the screw is extremely unstable, and there is a possibility that it will fall off due to slight impact or vibration, so it is always stable and reliable. There is a drawback that the screwing operation cannot be easily performed.

  From such a point of view, the present inventor reliably holds the screw from the supply of the screw to the tightening operation of the screw made of any material regardless of the magnetic body or the non-magnetic body. In addition, a predetermined operation from the supply of the screw to the state where the screw can be properly held at the tip of the bit and the tightening operation can be started sequentially, and when these operations are completed, the electric screwdriver is An automatic screw tightening device that can achieve smoothness and stabilization of the screw tightening work by starting and can significantly improve the work efficiency has been obtained and patented (see Patent Document 2).

  The automatic screw tightening device described in Patent Document 2 is mounted on an electric driver main body having a drive motor and a rotary output shaft that is rotationally driven by the motor, and on the tip of the rotary output shaft protruding from the electric driver main body. A bit, a tubular suction guide that defines a suction path around the bit, a screw supply holder that supplies and holds a screw in front of the suction guide, and the electric motor from the rear end of the screw supply holder An automatic screw tightening device comprising a cylinder extending toward a driver main body and a piston extending from the electric driver main body toward the inside of the cylinder, wherein the suction guide is disposed at a front end of the piston. A cylindrical suction guide holding body that holds the rear end portion so as to be movable in the axial direction of the rotation output shaft is provided, and a stopper is provided at the front end portion of the suction guide holding body. A spring that presses the rear end of the suction guide against the stopper, and an inner cylinder that is in sliding contact with the outer peripheral surface of the suction guide holder. A communication chamber that communicates with the inside of the suction guide is defined inside the inner cylinder, and an intake pipe that sucks the communication chamber is provided in the screw supply holder.

  In the electric screwdrivers and the like described in Patent Document 1 and Patent Document 2 described above, the screw (screw) supply mechanism applied to each of them appropriately holds the supplied screw at the tip of the bit of the electric screwdriver or the like. A catcher or screw supply holding body is provided, and a screw (screw) supply pipe for supplying and transferring screws in an appropriate state is connected to the catcher or screw supply holding body.

  Today, many electronic parts and electronic products that are assembled using the automatic assembly device including the electric screwdriver described in Patent Document 1 and Patent Document 2 described above are becoming increasingly smaller or smaller. It tends to be miniaturized. With this tendency, the same applies to the screws used in assembling the parts and products. For example, the screw head diameter is 5 mm or less, and the screw shaft diameter is 3 mm or less. Machine screws designed to fine dimensions have been manufactured and used. In this case, in general, the small screw designed in this way has a screw shaft portion whose length is smaller than the diameter of the screw head.

  However, when such a small screw is applied to a screw supply mechanism such as an electric screwdriver in the automatic assembly apparatus or the like, in the small screw having the above-described dimension setting, the length of the screw shaft portion is the diameter of the screw head. Since it is set smaller than the size, for example, when transferring the small screw by air pressure via a screw supply pipe, it rotates freely in front and rear, right and left within a through hole portion which is a circular hollow hole of the screw supply pipe. Thus, like a screw having a relatively long screw shaft portion, it is impossible to transfer the screw head while keeping the direction of the screw head constant. Therefore, the screw to be appropriately supplied cannot always be properly positioned with respect to the catcher or the screw supply holding body provided at the tip of the bit of the electric screwdriver or the like having the above-described configuration, and the screw tightening operation is smoothly performed. It becomes difficult to do.

  From such a point of view, the present inventor has made various studies and as a result, when the machine screw is transferred pneumatically by the screw supply pipe, the screw can freely move in the front, rear, left and right in the through hole portion which is a circular hollow hole of the screw supply pipe. The screw feed through hole portion of the screw supply pipe is improved and changed so that the screw head can be smoothly transferred while keeping the direction of the screw head constant. The screw supply holding member at the tip of the bit of an automatic screwdriver such as an electric screwdriver at the end of the screw supply pipe is simplified so that the screw can be quickly and reliably supplied to the tip of the bit. It has been found that the efficiency of screw tightening work by automatic supply of small screws, which has been difficult in the past, can be significantly improved.

  Therefore, the present inventor has found that the screw shaft portion, which has been conventionally difficult, based on various excellent confirmation items capable of performing the screw tightening operation more smoothly with respect to the automatic screw supply and mounting method to the automatic driver described above. The small screw can be smoothly supplied so that the length of the screw becomes smaller than the diameter of the screw head, and the automatic supply of the screw to the tip of the bit of the automatic driver can be performed quickly, reliably and simply. A method for automatically supplying and mounting a screw to an automatic driver, which can be performed, can significantly increase the efficiency of screw tightening work, and can be easily manufactured and reduced in manufacturing cost, and screw An automatic driver equipped with an automatic supply mechanism was developed and a patent application was filed (see Patent Document 3).

That is, in the method for automatically supplying a screw to an automatic driver described in Patent Document 3, a screw supply is performed in which a screw is transferred and supplied to the front of a bit attached to the tip of a rotary output shaft that is driven to rotate by a drive motor. In an automatic screw supply method in an automatic screwdriver equipped with an automatic screw supply mechanism provided with a holding member,
The screw is pneumatically transferred and supplied through a screw supply pipe having a non-circular screw guide through hole, and the screw head faces the tip end portion of the bit and the center of the screw shaft portion with respect to the screw supply holding member. An opening of the screw supply pipe is opened in a substantially vertical direction in the axial direction of the bit so that the line is coaxial with the bit, and is positioned with respect to the screw supply holding member. It sets so that it may hold | maintain to the said screw supply holding member.

Japanese Patent Publication No.59-37196 Japanese Patent No. 3041001 JP 2013-240868 A

  In the electric screwdriver equipped with the automatic screw supply mechanism described in Patent Document 3, a bit attached to the tip of the rotary output shaft protruding from the automatic driver main body is provided, and an intake passage is formed around the bit. A suction guide configured to surround the bit is provided, and a screw supply holding member for supplying and holding a screw is provided in front of the suction guide. The screw supply holding member is provided with a screw supply holding plate adjacent to the tip opening of the suction guide, and the screw supply holding plate is screw guided and held so as to face the tip opening of the suction guide. Provided with a groove and elastically tiltable or openable with respect to the tip opening of the suction guide, and facing the one side edge of the screw supply holding plate, the screw head and the screw shaft are respectively fixed. A screw supply pipe that holds the state and transfers the screw by air pressure is positioned and arranged.

  However, the previously proposed screw supply pipe that holds the screw head and the screw shaft part in a constant state and transfers the screw by air pressure is a screw supply pipe having a non-circular screw guide through hole. The screw head guide through-hole portion 42a is a flat shape for holding the screw head Sa as a screw guide through hole 42, and is formed of a circular flexible tube in a vertical cross section. It has been proposed to have a configuration in which a screw shaft portion guide through hole portion 42b having a narrow shape that crosses the hole portion 42a in a T-shaped cross section and guides and holds the screw shaft portion Sb is formed. Further, as a modification, it has been proposed that the screw guide through hole 42 has a common shape and is a flexible tube having a rectangular longitudinal cross section in the longitudinal direction.

  However, when the screw supply pipe having the above-described configuration is used, the screw supply pipe is formed of a flexible tube. Therefore, when the screw supply pipe is assembled as an automatic screw supply apparatus of an automatic driver, the screw supply pipe is bent or the like. When an unexpected pressure is applied from the outside, the screw head guide through-hole formed as the screw guide through-hole is crushed to close the through-hole and prevent the screw from being smoothly transferred. It was confirmed that there was.

  In view of this, the present inventor has conducted extensive studies and trial production in order to eliminate the above-described disadvantages, and as a result, in a screw supply pipe made of a cylindrical flexible tube configured as an automatic screw supply apparatus for an automatic driver, In order to prevent the screw head guide through hole formed as the screw guide through hole from being crushed and closing the through hole when pressure is applied from the outside by bending or the like. The inner surface corresponding to the tube outer shape of the screw head guide through hole formed in a T-shaped cross section that is easily subjected to the external pressure of the flexible tube having a circular vertical cross section in the longitudinal direction is defined as the outer shape of the flexible tube. By forming the arch-shaped curved inner surface along the screw head, it is possible to ensure a sufficient space for the screw head guide through-hole portion of the screw guide through-hole and smoothly achieve screw transfer. I have found that it is possible to reliably eliminate a disadvantage.

  Further, as a screw supply pipe made of a flexible tube configured as an automatic screw supply device of an automatic driver, it is configured as a circular flexible tube, and the screw head Sa is guided and held as a screw guide through hole. A screw head guide through hole portion having a flat shape and a screw having a narrow shape that guides and holds the screw shaft portion at a right angle with respect to the screw head guide through hole portion. The screw head guide through hole is formed with arch-shaped curved inner surfaces along the tube outer shape, and the screw shaft guide through hole. By forming the inner surfaces of both ends of the hole portions on the arch-shaped curved inner surfaces along the outer shape of the tube, a sufficient space for the screw head guide through hole portion of the screw guide through hole can be secured. The transfer can be achieved smoothly and before We found out that the the disadvantages of the threaded supply pipe can be reliably eliminated.

  Accordingly, an object of the present invention is to automatically supply a small screw whose length is smaller than the diameter dimension of the screw head to the automatic driver. It is an object to provide an automatic screw supply device for an automatic screwdriver that can perform the automatic screw supply more smoothly, quickly, surely, and simply and can significantly increase the efficiency of screw tightening operations. .

In order to achieve the above object, an automatic screw supply device for an automatic driver according to claim 1 of the present invention transfers and supplies a screw to the front of a bit attached to the tip of a rotary output shaft that is driven to rotate by a drive motor. In an automatic screw supply device in an automatic screwdriver equipped with an automatic screw supply device provided with a screw supply holding member to hold,
A screw head guide through hole portion having a flat shape for guiding the screw head, and a narrow shape for guiding the screw shaft portion by crossing the screw head guide through hole portion in a T-shaped cross section. A cylindrical flexible tube provided with a screw guide through hole comprising a screw shaft guide through hole, and the inner surface of the screw head guide through hole corresponding to the tube outer shape is curved in an arch shape. Provided with a screw supply pipe formed on the inner surface,
The screw is supplied to the screw supply pipe so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. It is characterized by setting to.

  According to a second aspect of the present invention, there is provided an automatic screw supply device for an automatic driver, wherein an inner surface corresponding to the outer shape of the tube of the screw shaft guide through hole of the screw guide through hole provided in the screw supply pipe is curved in an arch shape. It is formed on the inner surface.

According to a third aspect of the present invention, there is provided an automatic screw supply device for an automatic screwdriver, wherein a screw supply holding member for transferring and holding a screw in front of a bit attached to the tip of a rotary output shaft that is rotationally driven by a drive motor is provided. In an automatic screw supply device in an automatic driver provided with an automatic screw supply device provided,
A screw head guide through-hole portion having a flat shape for guiding the screw head and a narrow shape that crosses the screw head guide through-hole portion in a cross-sectional shape and guides the screw shaft portion. A cylindrical flexible tube provided with a screw guide through-hole comprising a screw shaft guide through-hole, and each of the tube outer shape of the screw head guide through-hole and the screw shaft guide through-hole. A screw supply pipe formed by forming the inner surfaces at both ends corresponding to the arch-shaped curved inner surface,
The screw is supplied to the screw supply pipe so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. It is characterized by setting to.

According to a fourth aspect of the present invention, there is provided an automatic screw supply device for an automatic screwdriver, wherein the screw supply pipe has a screw head facing the tip of the bit and a center line of the screw shaft is coaxial with the bit. The screw supply holding member that is set so as to supply the screw has a bit attached to the tip of the rotary output shaft protruding from the main body of the automatic driver having the drive motor and the rotary output shaft that is rotationally driven by the motor. For the suction guide configured to surround, it is provided to supply and hold a screw in front of this suction guide,
In the screw supply holding member, a screw supply holding plate is disposed in the vicinity of the tip opening of the suction guide, and the screw guide holding groove is arranged so as to face the tip opening of the suction guide. And is provided so that it can be elastically tilted or opened with respect to the tip opening of the suction guide,
The screw is supplied to the screw guide holding groove of the screw supply holding plate so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. The screw supply pipe is positioned and set so as to be attached to the tip of the bit.

  The automatic screw supply device for an automatic driver according to claims 1 to 3 of the present invention smoothly performs automatic supply of small screws such that the length of the screw shaft portion is smaller than the diameter dimension of the screw head. The screw can be automatically supplied to the tip of the bit of the automatic screwdriver quickly, reliably and easily, and the efficiency of the screw tightening operation can be remarkably increased, and it is manufactured with a simple structure. The manufacturing cost can be reduced with the simplification of the process, and the effect of contributing to the efficiency with the simplification of the screw tightening work is extremely large.

  According to the configuration of the automatic screw supply device in the automatic driver according to claim 4 of the present invention, the screw transferred and supplied from the screw supply pipe is appropriately guided and held between the screw head and the screw shaft, and the screw head Properly position the end side of the bit waiting in the suction guide, and the center axis of the screw reaching the tip of the screw shaft is parallel to the bit axis so that it can be quickly positioned against the tip of the bit in the suction guide. And can be mounted smoothly.

(A) is explanatory drawing which shows one Example of the screw supply pipe | tube which comprises the screw automatic supply apparatus in the automatic driver concerning this invention, (b) is description which shows the transfer state of the screw in the screw supply pipe | tube shown to (a). There is a figure. (A), (b) is explanatory drawing which shows each modification of the screw supply pipe | tube which comprises the screw automatic supply apparatus in the automatic driver which concerns on this invention. It is an exploded explanatory view showing a preferred embodiment of the automatic screw supply device in the automatic driver according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a front end side portion of an automatic driver, showing an embodiment of an automatic driver provided with an automatic screw supply device in an automatic driver according to the present invention. It is side surface sectional drawing which shows the operation state of the automatic driver shown in FIG.

  Next, an embodiment of an automatic screw supply device in an automatic driver according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIGS. 1A and 1B show an embodiment of a screw supply pipe constituting a screw automatic supply device in an automatic driver according to the present invention. Specifically, as shown in FIGS. 1A and 1B, the screw supply pipe 40A of the present embodiment is configured as a cylindrical flexible tube having a circular shape in a vertical cross section in the longitudinal direction, and is provided with a screw guide. As the through hole 42, a screw head guide through hole portion 43 having a flat shape for guiding and holding the screw head Sa, and a screw that crosses the screw head guide through hole portion 43 in a T-shaped cross section. The screw shaft portion guide through-hole portion 44 having a narrow shape for guiding and holding the shaft portion Sb is provided.

  In the screw supply pipe 40A of the present embodiment having the above-described configuration, the inner surface of the screw head guide through hole 43 that guides and holds the screw head Sa corresponds to the cylindrical tube outer shape along the tube outer shape. An arch-shaped curved inner surface 43a is formed. In this case, in the screw shaft portion guide through-hole portion 44 that guides and holds the screw shaft portion Sb, as shown by a broken line, the arch type along the tube outer shape also corresponds to the inner surface corresponding to the cylindrical tube outer shape. Can be formed on the curved inner surface 44a.

  According to the screw supply tube 40A of the present embodiment configured as described above, since it is configured as a cylindrical flexible tube, for example, when it is subjected to pressure from the outside due to bending or the like in its application, It is possible to prevent the screw head guide through hole portion 43 formed as the screw guide through hole 42 from being crushed and closing the through hole. That is, by forming the inner surface of the screw head guide through-hole portion 43 receiving the external pressure of the flexible tube into the arch-shaped curved inner surface 43a along the outer shape of the tube, the screw head guide of the screw guide through-hole 42 is formed. A sufficient space for the through-hole portion 43 can be secured, and the screw can be smoothly transferred.

  Further, as described above, also in the screw shaft portion guide through-hole portion 44 that guides and holds the screw shaft portion Sb, the inner surface corresponding to the cylindrical tube outer shape is formed on the curved inner surface 44a along the tube outer shape. As described above, when a pressure is applied from the outside by bending or the like, the screw head guide through hole portion 43 formed as the screw guide through hole 42 is crushed to close the through hole. The effect which prevents it will be acquired.

  Accordingly, the screw supply pipe 40A configured as described above can transfer the machine screw S as shown in the drawing while keeping the direction of the screw head in the screw guide through hole 42 constant. As shown in FIG. 4, the screw head Sa side is positioned on the tip side of the bit 14 waiting in the suction guide 16 so that the central axis of the screw reaching the tip of the screw shaft portion Sb is parallel to the axis of the bit 14. Is set. Then, the other end of the screw supply pipe 40 is connected to a screw supply source (not shown) for storing a number of required screws, and each screw S is transferred by air pressure, so that it is attached to the tip of the bit of the automatic driver. The screw S can be supplied appropriately.

  FIGS. 2A and 2B show a modification of the screw supply pipe 40A constituting the automatic screw supply device in the automatic driver according to the present invention. That is, in FIG. 2, the screw supply tube 40B of the present embodiment is configured as a cylindrical flexible tube having a circular shape in the vertical cross section in the longitudinal direction, as in the embodiment shown in FIG. As the guide through hole 42, a screw head guide through hole portion 45 having a flat shape for guiding and holding the screw head Sa, and a cross section crossing the screw head guide through hole portion 45. The screw shaft portion guide through-hole portion 46 having a narrow shape for guiding and holding the screw shaft portion Sb is provided.

  In the screw supply pipe 40B of the present embodiment having the above-described configuration, a plain washer and a spring washer are attached to the neck portion of the screw S, for example, as shown in the figure with respect to the screw head guide through hole 45 of the screw guide through hole 42. And a screw head Sa provided with a washer W in combination.

  Further, in the screw supply pipe 40B of the present embodiment, the screw shaft guide guide hole 46 provided so as to intersect with the screw head guide through hole 45 of the screw guide through hole 42 has one end side and the other end side. Are set to different dimensions, and can be used as shown in FIG. 2 (a) or (b) depending on the length of the screw shaft Sb of the screw S to be used. The

  Accordingly, also in the screw supply pipe 40B of the present embodiment configured as described above, as shown in FIGS. 2A and 2B, the screw head guide through hole portion for guiding and holding the screw head Sa. In 45, the inner surfaces of both ends corresponding to the cylindrical tube outer shape are respectively formed on the arch-shaped curved inner surfaces 45a and 45b along the tube outer shape. Further, in this case, the screw shaft guide through-hole portion 46 that guides and holds the screw shaft portion Sb also has an arch shape along the tube outer shape with respect to the inner surfaces at both ends corresponding to the cylindrical tube outer shape. It can be formed on the curved inner surfaces 46a, 46b.

  Accordingly, the screw supply pipe 40B configured as described above has a screw head S with a constant direction in the screw guide through hole 42, and as shown in FIGS. 2 (a) and 2 (b), Since S can be transferred, as shown in FIG. 4 to be described later, one end thereof is positioned on the tip side of the bit 14 waiting in the suction guide 16 on the screw head Sa side, and the screw shaft portion Sb The center axis of the screw reaching the tip is set to be parallel to the axis of the bit 14. Then, the other end of the screw supply pipe 40 is connected to a screw supply source (not shown) for storing a number of required screws, and each screw S is transferred by air pressure, so that it is attached to the tip of the bit of the automatic driver. The screw S can be supplied appropriately.

  Next, an embodiment of an automatic screw supply apparatus for appropriately supplying the screw S to the bit tip of the automatic driver will be described with respect to the screw supply pipe 40A (40B) configured as described above.

  FIG. 3 shows that in the configuration of the automatic driver, the suction guide 16 is further surrounded by a cylindrical suction guide 16 provided so as to surround the entire bit 14 mounted as a driver tool on the automatic driver main body 10. FIG. 4 shows a screw automatic supply device that is configured as described above and is configured as a screw supply holding member 30 (see FIGS. 4 and 5) that supplies screws and holds them by suction. That is, FIG. 3 shows an exploded perspective view of the automatic screw supply device of the present embodiment. The screw supply holding plate 36 pivotally attached to the distal end portion of the screw supply holding member 30, and this The screw supply pipe 40A (40B) is provided for the screw supply holding plate 36.

  However, as shown in FIG. 3, the screw supply holding plate 36 as the automatic screw supply device is mutually connected to the distal end portion of the screw supply holding member 30 by using a pivot 37 on the lower end side. The screw supply holding plate 36 is provided so as to be pivotally connected and to be able to be tilted elastically in the direction of the arrow with the pivot support 37 as a fulcrum through an appropriate spring member (not shown). In the present embodiment, the screw supply holding plate 36 has a screw guide holding groove 38 for guiding and holding the screw S supplied from the screw supply pipe disposed above the screw supply holding plate 36 at the upper end side where the screw supply holding plate 36 is opened. Is provided. The screw guide holding groove 38 has a substantially U-shape for guiding and holding the screw S falling from the opening end of the screw supply pipe 40A (40B) provided in the upper part of the figure, and the screw head. The screw head guide holding groove 39a for guiding and holding Sa and the screw shaft guide holding groove 39b for guiding and holding the screw shaft portion Sb are configured.

  Therefore, if the screw supply holding plate 36 as the screw automatic supply device configured as described above properly holds the screw S in the screw guide holding groove 38, the screw head Sa of the held screw S will be described. The top surface of the head faces the tip opening of the suction guide 16 that accommodates the bit 14 so as to be able to advance and retract. In this case, as will be described later, since the suction guide 16 always causes a vacuum suction action on the tip opening side in the inside thereof, the screw S located opposite to the suction guide 16 is sucked into the suction guide 16 and bit. 14 can be securely sucked and held at the tip portion.

  Next, referring to FIGS. 4 and 5, an embodiment of an automatic driver provided with an automatic screw supply device having the above-described configuration will be described.

  4 and 5, reference numeral 10 denotes an automatic driver main body, and a screwdriver is provided at the tip of the rotary output shaft 12 projecting from a drive motor portion (not shown) provided inside the automatic driver main body 10. A bit 14 as a tool is detachably attached. A cylindrical suction guide 16 is provided so as to surround the entire bit 14, and a rear end portion of the suction guide 16 is placed in a suction guide holding body 20 formed in a cylindrical shape. It is accommodated so as to be movable in the longitudinal direction.

  In the present embodiment, an electric motor or an air motor can be used as the drive motor unit provided in the automatic driver main body 10, whereby the automatic driver is configured as an electric driver or an air driver, respectively. Can do.

  The suction guide holding body 20 is formed integrally with a bearing housing that supports the output shaft 12 via a bearing 18, and a rear end portion of the suction guide 16 is provided at a front end portion of the suction guide holding body 20 inside thereof. The coil spring 22 to be brought into contact with the stopper 21 is accommodated. The suction guide holder 20 is attached to the front end of a fixed inner cylinder 26 as a hollow piston fixed to the outer case 24 of the automatic driver main body 10. Further, a fixed outer cylinder 28 fixed to the outer case 24 of the automatic driver main body 10 is provided outside the fixed inner cylinder 26.

  Further, a screw supply holding member 30 as an automatic screw supply mechanism for supplying and holding the screw so as to surround the suction guide 16 includes a fixed inner cylinder 26 and a fixed outer cylinder 28 of the automatic driver main body 10. Are slidably fitted between them. Therefore, the screw supply holding member 30 includes a moving outer cylinder 32 as a cylinder fitted between the fixed inner cylinder 26 and the fixed outer cylinder 28, and a suction guide provided at the front end of the fixed inner cylinder 26. A screw supply holding plate 36 that includes a moving inner cylinder 34 that is in sliding contact with the outer peripheral surface of the holding body 20 and temporarily holds the screw at a slight distance toward the tip end side of the suction guide 16 is appropriately elastic in the direction of the arrow. It can be tilted freely.

  In the present embodiment, the screw supply holding member 30 is formed with a first fluid chamber 44 between the moving outer cylinder 32 and the moving inner cylinder 34, and communicates with the first fluid chamber 50. One ventilation pipe 51 is provided in a part of the movable outer cylinder 32 so as to supply air pressure from the outside.

  Further, a vent path 52 is provided in a part of the movable outer cylinder 32, and the vent path 52 is a second airtightly formed between the fixed inner cylinder 26 of the automatic driver main body 10 and the movable outer cylinder 32. The fluid chamber 53 is communicated, while a second vent pipe 54 communicating with the vent path 52 is provided in a part of the movable outer cylinder 32 to supply air pressure from the outside. That is, the movable outer cylinder 32 and the fixed inner cylinder 26 constitute an air cylinder mechanism that moves the screw supply / holding member 30 forward and backward in the axial direction of the rotary output shaft 12.

  Furthermore, a third fluid chamber 55 is formed between the moving inner cylinder 34 and the suction guide 16, and a third vent pipe 56 that communicates with the third fluid chamber 55 via an intake passage 58. Is provided on the screw supply holding member 30. In this case, an opening 60 is provided on the attachment base side of the suction guide 16 so that the third fluid chamber 55 communicates with the inside of the suction guide 16.

  The screw supply / holding member 30 configured in this manner gradually expands the volume of the first fluid chamber 50 when air pressure is supplied to the first vent pipe 51. As a result, the screw supply / holding member 30 is increased. The member 30 moves forward so as to retract from the fixed outer cylinder 28 of the automatic driver body 10 (see FIG. 4). Accordingly, in this case, the distal end portion of the suction guide 16 is retracted and stored in the screw supply holding member 30.

  Further, if air pressure is supplied to the second vent pipe 54, the volume of the second fluid chamber 53 is gradually enlarged. As a result, the screw supply holding member 30 is fixed to the fixed outer cylinder of the automatic driver main body 10. It moves backward so as to enter inside 28 (see FIG. 5). Therefore, in this case, the tip end portion of the suction guide 16 projects outward by tilting the screw supply holding plate 36 provided at the tip end of the screw supply holding member 30 forward against the spring elasticity.

  Further, if vacuum suction is performed on the third fluid chamber 55 from the third vent pipe 56, the third fluid chamber 55 is depressurized, and the interior of the suction guide 16 communicating with the fluid chamber 55 is A vacuum suction action can always be generated on the tip opening side.

  Next, the automatic screw supply operation and the screw tightening operation by the automatic screwdriver in the automatic screwdriver equipped with the automatic screw supply device of the present embodiment having the above-described configuration will be described.

  First, air pressure is supplied to the first fluid chamber 50 of the screw supply holding member 30 through the first vent pipe 51 by operating a drive switch (not shown) of the automatic driver. Thereby, the screw supply holding member 30 moves forward with respect to the bit 14, and holds the screw supply holding member 30 in the state shown in FIG. In this case, the opening end of the screw supply pipe 40A (40B) is positioned so as to face the screw guide holding groove 38 of the screw supply holding plate 36 disposed below the screw supply pipe 40A (40B).

  Thereafter, the bit 14 is rotationally driven at a predetermined timing, and the screw S stored in a screw supply source (not shown) is pneumatically supplied to the opening end via the screw supply pipe 40A (40B). Transport. The screw S transferred to the open end of the screw supply pipe 40A (40B) is securely guided and held in the screw guide holding groove 38 of the screw supply holding plate 36 so as to drop naturally. (See FIG. 3).

  In this case, vacuum suction is performed on the third fluid chamber 55 of the screw supply holding member 30 from the third vent pipe 56 through the intake passage 58 regardless of the above-described operation. As a result, as described above, the inside of the suction guide 16 can always generate a vacuum suction action on the tip opening side, so that the suction guide 16 can enter the screw guide holding groove 38 of the screw supply holding plate 36. The held screw S is immediately sucked into the suction guide 16 and can be appropriately sucked and held at the tip of the bit 14. During this time, the screw S held by suction at the tip of the bit 14 can be properly fitted and mounted on the tip blade of the bit 14 that is rotationally driven, and is in a state of waiting for screw tightening by an automatic driver. .

  Next, air pressure is supplied to the second fluid chamber 53 of the screw supply holding member 30 through the second vent pipe 54. As a result, the screw supply holding member 30 moves backward with respect to the bit 14, and the screw supply holding member 30 is held in the state shown in FIG. Accordingly, the screw tightening operation by the automatic driver can be easily achieved in this state.

  Accordingly, in this state, the screw S held at the tip of the bit 14 in the automatic driver is brought into contact with a predetermined screw attachment object to perform screw tightening work, and the screw tightening torque of the screw S is applied to the automatic driver. When a preset tightening torque is reached, the completion of screw tightening is appropriately detected and the driving of the automatic driver is stopped.

  When the next screw tightening operation is performed, the screw S is sequentially supplied to the distal end portion of the bit 14 by repeating the operation described above by operating the drive switch (not shown) of the automatic driver again. Thus, a continuous automatic screwing operation by an automatic driver can be achieved.

  In the present invention, the screw supply holding plate 36 provided on the screw supply holding member 30 is configured to be elastically tiltable by opening one end side, for example, on both sides in the central portion. It is also possible to appropriately adopt a double-speech system that opens elastically.

  In the present invention, when the screw S is supplied and transferred to the opening end via the screw supply pipe 40A (40B), the screw supply holding member 30 is advanced with respect to the bit 14 in the above-described embodiment. In the state where the screw supply holding member 30 is held in the state shown in FIG. 4, the case where the screw S is supplied and transferred to the opening end via the screw supply pipe 40 </ b> A (40 </ b> B) is shown. In the state where the holding member 30 is moved backward with respect to the bit 14 and the screw supply holding member 30 is held in the state shown in FIG. 5, the open end of the screw supply pipe 40 </ b> A (40 </ b> B) is closed by the suction guide 16. Therefore, at this time, the screw S is supplied and transferred to the opening end via the screw supply pipe 40A (40B), and is kept on standby as a screw S ′ necessary for the next screw tightening operation. And it can also be.

  Although the preferred embodiment of the present invention has been described above, the present invention relates to the screw supply holding plate provided on the screw supply holding member constituting the automatic screw supply device in the automatic driver which is the main component in the present invention. Without limitation, it is possible to change the design to have various shapes and configurations having substantially the same functions as in the embodiment, and also regarding the screw supply pipe, the outer shape and the screw guide through hole, respectively. Various design changes such as various shapes and configurations having substantially the same functions as those in the embodiments are possible, and many other design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Automatic driver main body 12 Rotation output shaft 14 Bit 16 Adsorption guide 18 Bearing 20 Adsorption guide holder 21 Stopper 22 Coil spring 24 Outer case 26 Fixed inner cylinder 28 Fixed outer cylinder 30 Screw supply holding member 32 Moving outer cylinder 34 Moving inner cylinder 36 Screw supply holding plate 37 Pivot support 38 Screw guide holding groove 39a Screw head guide holding groove 39b Screw shaft guide holding groove 40A, 40B Screw supply pipe 42 Screw guide through hole 43 Screw head guide through hole 43a Curved inner surface 44 Screw shaft guide through hole 44a Curved inner surface 45 Screw head guide through hole 45a, 45b Curved inner surface 46 Screw shaft guide through hole 46a, 46b Curved inner surface 50 First fluid chamber 51 First Vent pipe 52 Ventilation path 53 Second fluid chamber 54 Second vent pipe 55 Third fluid chamber 56 Third vent pipe 58 Intake path 60 Opening S Flip Sa screw head Sb threaded shaft portion W washer

Claims (4)

Automatic screw supply device in an automatic driver having an automatic screw supply device provided with a screw supply holding member for transferring and supplying a screw in front of a bit mounted at the tip of a rotary output shaft that is driven to rotate by a drive motor In
A screw head guide through hole portion having a flat shape for guiding the screw head, and a narrow shape for guiding the screw shaft portion by crossing the screw head guide through hole portion in a T-shaped cross section. A cylindrical flexible tube provided with a screw guide through hole comprising a screw shaft guide through hole, and the inner surface of the screw head guide through hole corresponding to the tube outer shape is curved in an arch shape. Provided with a screw supply pipe formed on the inner surface,
The screw is supplied to the screw supply pipe so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. An automatic screw supply device for an automatic screwdriver characterized by being set to   2. The automatic screw supply in an automatic driver according to claim 1, wherein an inner surface corresponding to the outer shape of the tube of a screw shaft guide through hole of a screw guide through hole provided in the screw supply pipe is formed as an arch-shaped curved inner surface. apparatus. Automatic screw supply device in an automatic driver having an automatic screw supply device provided with a screw supply holding member for transferring and supplying a screw in front of a bit mounted at the tip of a rotary output shaft that is driven to rotate by a drive motor In
A screw head guide through-hole portion having a flat shape for guiding the screw head and a narrow shape that crosses the screw head guide through-hole portion in a cross-sectional shape and guides the screw shaft portion. A cylindrical flexible tube provided with a screw guide through-hole comprising a screw shaft guide through-hole, and each of the tube outer shape of the screw head guide through-hole and the screw shaft guide through-hole. A screw supply pipe formed by forming the inner surfaces at both ends corresponding to the arch-shaped curved inner surface,
The screw is supplied to the screw supply pipe so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. An automatic screw supply device for an automatic screwdriver characterized by being set to A screw supply holding member that sets the screw supply pipe so that a screw is supplied so that a screw head of the screw faces a tip of the bit and a center line of a screw shaft portion is coaxial with the bit. A suction guide configured to surround a bit attached to the tip of the rotary output shaft protruding from the main body of the automatic driver having a drive motor and a rotary output shaft driven to rotate by the motor. Provided to supply and hold screws,
In the screw supply holding member, a screw supply holding plate is disposed in the vicinity of the tip opening of the suction guide, and the screw guide holding groove is arranged so as to face the tip opening of the suction guide. And is provided so that it can be elastically tilted or opened with respect to the tip opening of the suction guide,
The screw is supplied to the screw guide holding groove of the screw supply holding plate so that the screw head of the screw faces the tip of the bit and the center line of the screw shaft is coaxial with the bit. The automatic screw supply device for an automatic driver according to any one of claims 1 to 3, wherein the screw supply pipe is positioned and set so as to be attached to a tip portion of a bit.

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