JP2010017825A - Screw tightening machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-use screw tightening machine accurately positioning a screw in a hole, for example, for fastening a joint bracket before starting tightening the screw. <P>SOLUTION: The screw tightening machine includes: a driver bit 12; a guide section 5 attached to a screw tightening tool, and covering the driver bit 12; a sliding section 3 relatively movable in an axial direction of the driver bit with respect to the guide section 5; and a magazine section 4, fixed on the sliding section 3, to hold a plurality of screws and sequentially transfer them onto an axis of the driver bit. The circumferential side of the driver bit, between the driver bit and the guide section 5, is provided with an axially slidable sleeve 40 rotated by the driver bit 12, a moving mechanism for projecting the screw 80 forward from the sliding section 3 by advancing the sleeve 40 is provided, and a magnet 120 is disposed in the vicinity of a passage in which the sleeve 40 advances. Even when loaded with discrete screws 80, the magazine section 4 holds the screws by the effect of the magnet 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screw tightening machine having a screw feeding mechanism for feeding screws from a magazine containing a plurality of screws to the tip of a driver bit at regular intervals, and in particular, before tightening a screw, the screw to be tightened from the tip of the main body. The present invention relates to a screw tightening machine capable of facilitating tightening position alignment by protruding.

  Patent Document 1 discloses a screw tightening machine having a screw feed mechanism that mounts a plurality of loose screws, feeds them one by one on the driver bit axis, and tightens the screw by pressing the driver tool in the direction of the tightening material. ing. In Patent Document 1, a screw feeding mechanism for feeding screws one pitch at a time is provided in the magazine, and the magazine is mounted on the sliding member so that the screw guide groove is positioned at right angles to the longitudinal axis of the sliding member. The screw feeding mechanism is interlocked with the operating mechanism. Then, the screw is fed one pitch by one reciprocating motion of the sliding member, the screw is tightened by a driver bit, and this operation is continuously repeated to tighten the screw.

JP-A-6-339870

  In the structure shown in Patent Document 1, the screw before tightening is held inside the screw tightening machine, and it is difficult to position the tip of the screw during screw tightening, and it is difficult to tighten the screw accurately at a predetermined position. there were. In particular, when fixing a joint fitting used for residential construction to a building material, it has been required that the hole of the joint fitting can be screwed to an accurate position because the gap with the screw is small.

  An object of the present invention is to provide an easy-to-use screw tightening machine that can accurately position a screw in a hole such as a joint fitting before starting screw tightening.

  Another object of the present invention is to provide a screw tightening machine that can easily attach a loose screw to a magazine and can tighten a plurality of screws in succession.

  Still another object of the present invention is to provide a screw tightening machine that can be realized at low cost by simplifying the structure of the magazine and screw moving mechanism.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, a screw tightening tool that rotates a driver bit, a guide portion that is attached to the screw tightening tool and covers the driver bit, and is movable relative to the guide portion in the axial direction of the driver bit. In a screw tightening machine in which a magazine part that holds a plurality of screws and sequentially transports them on the axis of a driver bit is fixed, the magazine part is mounted in a loose state. A guide groove for holding the head of the screw was provided, and a mounting opening for mounting the head of the screw in the guide groove was formed in the guide groove. Furthermore, a moving mechanism that moves the conveyed screw forward in the axial direction using the rotational force of the driver bit is provided, and the moving mechanism projects the screw forward from the sliding portion without sliding the magazine portion in the axial direction. It was configured to be able to. The attachment port for the loose screw is formed at a position where one or several pieces can be inserted from the front side of the screw tightening tool so that the head of the screw is brought into contact with the guide groove.

  According to another feature of the present invention, the moving mechanism includes a sleeve that is provided on an outer peripheral side of the driver bit and between the guide portion and that is rotated by the driver bit and is slidable in the axial direction. A magnet for adsorbing the screw to be moved is provided on the sliding portion adjacent to the path to be moved. The sleeve has a cylindrical shape, and the inner peripheral side of the sleeve is preferably a polygonal shape corresponding to the outer shape of the driver bit. The sleeve can be made of iron or other metal, and is preferably made of iron because the magnetic force of the magnet acts on the screw via the sleeve.

  According to still another feature of the present invention, the moving mechanism includes a male screw portion formed on the outer periphery of the sleeve and a half nut having a female screw portion provided at a position corresponding to the male screw portion. The sliding portion is provided with a gripping means for holding the screw tip protruding from the sliding portion, and the gripping means has two members that are separated in the axial direction and the vertical direction.

  According to the invention of claim 1, the magazine portion has a guide groove for holding the head of the screw mounted in a loose state, and the guide groove has a mounting opening for mounting the head of the screw in the guide groove. Since it is formed, the loose screw can be directly loaded into the magazine provided in the screw tightening machine, so that an inexpensive screw can be used without using the screw attached to the connecting band.

  According to the invention of claim 2, since the moving mechanism for moving the conveyed screw forward in the axial direction using the rotational force of the driver bit is provided, the screw tightening tool can be rotated without sliding the magazine portion in the axial direction. Since the screw can be moved so as to protrude forward from the sliding part using force, the screw can be accurately positioned in a hole such as a joint fitting stop before starting screw tightening, and an easy-to-use screw tightening machine can be realized. .

  According to the invention of claim 3, since the mounting opening is formed at a position where the head of the screw is inserted from the front side of the screw tightening tool, the screw can be mounted from the front of the screw tightening tool. It is possible to realize a screw tightening machine in which loose screws can be easily attached to the magazine.

  According to the invention of claim 4, by moving the sleeve forward, the moving mechanism for projecting the screw forward from the sliding portion is provided, the magnet is provided in the portion adjacent to the path along which the sleeve advances, and the screw is attracted to the magnet. Therefore, even if a connecting band is not used for holding the screw, it does not fall off, and a magazine portion using a loose screw can be realized with a simple configuration.

  According to the invention of claim 5, since the sleeve has a cylindrical shape and the inner peripheral side of the sleeve has a polygonal shape corresponding to the outer shape of the driver bit, when the screw tightening tool is rotated, the sleeve is rotated in synchronization therewith. And it is not necessary to prepare a separate driving means for rotating the sleeve.

  According to the invention of claim 6, since the sleeve is made of iron and the magnetic force of the magnet acts on the screw via the sleeve, the screw can be securely fixed to the sleeve with a simple configuration.

  According to the invention of claim 7, since the moving mechanism of the sleeve is constituted by the male screw portion formed on the outer periphery of the sleeve and the half nut having the female screw portion provided at a position corresponding to the male screw portion, the sleeve is rotated. The sleeve can be moved in the forward direction only by applying force.

  According to the eighth aspect of the present invention, the gripping means for holding the tip of the screw in a state protruding from the sliding portion is provided, and the gripping means has two members that are separated from the axial direction and the vertical direction. Since the tip protrudes from the screw tightening machine and is held and the screw tip can be visually recognized from the outside, the screw can be tightened accurately at a predetermined position.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted. In the present specification, unless otherwise specified, the direction indicated by the arrow in FIG.

  FIG. 1 is a view showing the entire screw tightening machine 1, and a longitudinal sectional side view is partially shown. The screw tightening machine 1 is relatively movable in the axial direction of the driver bit with respect to a screw tightening tool 2 such as an impact driver, a guide portion 5 attached to the front side near the rotation axis of the screw tightening tool 2, and the guide portion 5. The sliding part 3 and the magazine part 4 fixed to the sliding part 3 are comprised. A spindle case 10 is provided at the lower portion of the screw tightening tool 2, and a spindle 11 is disposed at the center thereof. A driver bit 12 is attached to the spindle 11. The guide unit 5 includes a holder 20 fixed to the spindle case 10 with a set screw 21 and a guide pipe 22 fixed to the holder 20 with a screw 23 so as to be rotatable. The sliding portion 3 includes a sliding body 30 attached to the inside of the guide pipe 22, and the sliding portion 3 cannot rotate with respect to the guide pipe 22 due to a notch provided in the guide pipe 22, and It is attached so as to be slidable in the front-rear direction.

  A cylindrical space is provided on the rear side (the screw tightening tool 2 side) of the sliding body 30, and the space can slide in the front-rear direction with respect to the driver bit 12 and cannot rotate relative to the driver bit 12. A sleeve 40 is attached. The sleeve 40 has a substantially cylindrical shape with a circular outer periphery and a hexagonal inner periphery, and a flange 42 extending radially outward is formed near the rear in the front-rear direction, and the front surface of the flange 42 and the sliding body 30. It is fixed so that it can move back and forth in the axial direction via a cone spring 41 mounted between the through hole and the rear surface side periphery. Since the rear surface of the flange 42 comes into contact with the front surface of the retaining ring 60 attached to the inner circumferential recess of the cylindrical space of the sliding body 30, the sliding distance of the sleeve 40 is restricted. The cone spring 41 is a compression spring and urges the flange 42 to move rearward in the axial direction. A screw groove, which will be described later, is provided on the outer periphery of the sleeve 40 and is arranged so as to mesh with the half nut 50. The half nut 50 is fixed to the leaf spring 51 with a bolt 53 via a plate 52. The other end of the leaf spring 51 that fixes the half nut 50 is fixed to the sliding body 30 by a bolt 55 via a special washer 54.

  A retaining ring 60 is disposed in the cylindrical space of the above-described sliding body 30 to regulate the sliding range of the sleeve 40. The sliding body 30 is urged by a spring 9 disposed between the sliding body 30 and a spring seat 8 provided to face the spindle case 10. The spring 9 is a compression spring, and the urging direction is a direction in which the sliding body 30 moves forward with respect to the screw tightening tool 2.

  The magazine portion 4 is positioned by a pin 71 between the magazine case presser 70 and the sliding body 30 and is fixed to the sliding body 30 by bolts 72. The magazine portion 4 includes a ribbon spring 73, a magazine case 74, a shaft 75, a ribbon spring holder 76, and a push plate 78 fixed to the ribbon spring holder 76 by a countersunk screw 77. A pin 71 passes through a hole provided at one end of the ribbon spring 73 and is sandwiched between the magazine case holder 70 and the sliding body 30, thereby fixing one end of the ribbon spring 73. Here, since the guide pipe 22 is rotatably held with respect to the holder 20 fixed to the spindle case, when the magazine portion 4 interferes with wood such as a beam (a material to be tightened), the magazine portion 4 is placed in the holder 20. The magazine part 4 can avoid interference with beams etc.

  The other end around which the ribbon spring 73 is wound is housed in a ribbon spring holder 76, whereby the ribbon spring holder 76 is urged toward the driver bit 12 (right side in the figure). The ribbon spring holder 76 is disposed in the magazine case 74 so as to be slidable in the longitudinal direction, and a pressing plate 78 fixed so as to protrude from the ribbon spring holder 76 abuts on the head of the screw 80 at the rearmost end aligned. By contacting and urging these screws 80 toward the driver bit 12 (right side in the figure), the screws 80 serve as conveying means for conveying the screws 80. The guide groove 81 that holds the screw 80 has a substantially rectangular cross section and is cut out forward from the vicinity of the center of one side thereof, and the inner wall surrounds the head of the screw 80. . In this embodiment, the guide groove 81 is formed integrally with the magazine case presser 70. The end of the guide groove 81 (the front end, the right end in FIG. 1) is positioned before the sliding range of the sleeve 40. The screw 80 is accommodated in the guide groove 81 so as to be slidable in the longitudinal direction of the magazine case 74. When the screw 80 reaches a position coaxial with the driver bit 12, the screw 80 is not held by the guide bit 81, and the driver bit 12 is axially forward. Although it becomes movable, since the magnet 120 is provided on the side sliding body 30, the screw 80 is attracted to the side wall of the sliding body 30 by the magnetic force of the magnet 120 and is held so as not to move in the axial direction. .

  FIG. 2 is a view (front view) seen from the arrow A in FIG. A sliding body 30 is slidably attached to the guide pipe 22, and the magazine portion 4 is fixed to the sliding body 30. The plurality of screws 80 are urged toward the driver bit 12 (right side) by a push plate 78 fixed to the ribbon spring holder 76. The guide groove 81 for accommodating the head of the screw 80 can be manufactured integrally with the magazine case holder 70. The guide pipe 22 has a notch 22a for sliding the sliding body 30 in a non-rotatable manner with respect to the axial direction of the driver bit 12, a wide notch 22b that is not in contact with the plate 52, and a half nut 50 on the right side in the figure. A narrow notch 22c that contacts the plate 52 is provided. A notch is provided at the tip of the guide pipe 22, and a screw retainer 92 fixed to the leaf spring 90 with a bolt 91 is arranged in a pair.

  To attach the screw 80, the ribbon spring holder 76 is moved by hand to the left (in the direction opposite to the feeding direction) in FIG. 1, and the screw 80 is inserted into the mounting port 81a from the front, and the head of the screw 80 moves the mounting port 81a. Are inserted one by one so as to abut against the inner wall of the guide groove 81, and are slid toward the driver bid 12 to align with the guide groove 81. The mounting port 81a is a hole having a diameter larger than the head of the screw 80 to be mounted, and the position thereof is preferably near the end of the guide groove 81 on the ribbon spring holder 76 side. The screw 80 inserted into the guide groove 81 is urged by the ribbon spring holder 76 and the push plate 78 that are urged by the ribbon spring 73 so that the leading screw 80 is positioned directly below the sleeve 40. At this time, since the screw 80 is not held by the connecting band as in the prior art, the urging force can be reduced. Further, in this embodiment, the screw 80 is inserted from the front side with respect to the guide groove, that is, from the direction of the arrow A in FIG. 1, so that the worker can easily attach the screw 80. .

  3 is a cross-sectional view taken along the line BB in FIG. The magazine case holder 70 is fixed so as to contact the sliding body 30. Since the guide groove 81 is formed in the magazine case presser 70, the end portion of the guide groove 81 is the same as the end portion of the magazine case presser 70. Inside the sliding body 30, a sleeve 40 is arranged so as to be movable in the axial direction of the driver bit 12. A bush 95 is arranged on one side around the sleeve 40 and a half nut 50 is arranged on the other side. The bit 12 is held so that the central axis of the sleeve 40 does not shift. The bush 95 is a substantially cylindrical member made of iron in consideration of wear resistance, and a notch 22b is formed on the side where the half nut 50 side is inserted. The shapes of the sleeve 40 and the half nut 50 will be described later.

  FIG. 4 is a partial cross-sectional view taken along a line CC in FIG. A sliding body 30 is held so as to be movable at the front end side of the guide pipe 22, and a pair of screw presses 92 are fixed to the sliding body 30 by bolts 93 at the tip of the sliding body 30 (in the drawing). The portion shown by a thick line on the outside of the sliding body 30) is held by a screw 91. By the leaf spring 90, the screw retainer 92 can be moved by a small distance so as to be separated in the direction indicated by the arrow 28, that is, in the direction perpendicular to the axial direction of the driver bit 12. A notch 100 is formed in the guide pipe 22 so that the leaf spring 90 does not contact the guide pipe 22 when the sliding body 30 moves in the front-rear direction. The screw 80 can pass forward in the axial direction in a passage hole 30 a provided in the sliding body 30.

  5A is a cross-sectional view taken along the line DD in FIG. 1, and FIG. 5B is a cross-sectional view taken along the line EE in FIG. The magazine case 74 fixed to the sliding body 30 has reinforcing ribs 74a on both sides, and a rotatable shaft 75 penetrating the ribbon spring holder 76 is movably hooked to a groove of the reinforcing rib 74a. The The ribbon spring holder 76 is held by the shaft 75 so as not to be detached from the magazine case 74. The ribbon spring 73 is accommodated in the ribbon spring holder 76, and the cap 79 is for taking the left and right play of the ribbon spring 73. In FIG. 5 (2), there is a magazine presser 70 inside the magazine case 74, and a guide groove 81 for guiding a screw 80 is formed in the magazine presser 70. The magazine case 74 is fixed to the sliding body 30 by being sandwiched between the sliding body 30 and the magazine presser 70. As can be understood from the drawing, the shape of the guide groove 81 is a shape along the screw head (a groove having a C-shaped cross section) in accordance with the shape of the screw head. The screw 80 can be moved only in the longitudinal direction of the magazine portion (left-right direction in FIG. 1).

  FIGS. 6A and 6B are diagrams showing the shapes of the sleeve 40 and the half nut 50, wherein (1) is a rear view (screw tightening tool 2 side), (2) is a side view, and (3) is a front view (front side). is there. 6 (1) and 6 (3), since the driver bit 12 passes through the inside of the sleeve 40, the shape of the inner peripheral wall 40c is the same as the outer shape of the driver bit 12, that is, a regular hexagon. The size of the driver bit 12 is set to have an appropriate interval that can move in the axial direction without resistance and does not cause rattling. The half nut 50 has an arcuate curved surface on the side in contact with the sleeve 40, and the curved surface portion is a female screw portion 50a in which a thread groove is formed.

  6 (2), a cylindrical portion 40c is formed on the rear side (upper side in FIG. 6) of the sleeve, which is a place where the spring 9 is disposed on the outer peripheral side, and on the front side (lower side in FIG. 6) of the sleeve 40. A male screw portion 40a having a male screw (not shown in the figure of the shape of the screw groove) is formed on the outer periphery. When the male screw portion 40a rotates, the sleeve 40 moves in the axial direction by the action of the female screw portion 40b that does not move in the axial direction. At this time, the distance that the length of the male screw portion 40a can be moved by the rotation of the sleeve 40 is determined. On the rear side (upper side in FIG. 6) of the male screw portion 40a, a cylindrical portion 40b in which no thread groove is formed. When the cylindrical portion 40b comes into contact with the half nut 50 by the advancement of the sleeve 40, a part of the thread of the half nut 50 rides on the cylindrical portion 40b. Since the male screw portion 40a does not mesh with the female screw 50a, the sleeve 40 can idle without receiving the action from the half nut 50.

  A flange 42 is formed between the cylindrical portions 40b and 40c, and the flange 42 is a surface on which the spring 9 and the cone spring 41 abut. The female screw portion 50a of the half nut 50 is formed with a screw groove having a shape corresponding to the male screw portion 40a.

  As described above, the moving mechanism for moving the screw 80 can be realized by a simple configuration using the sleeve 40 having the male screw portion 40a and the half nut 50 having the female screw portion 50a. In this embodiment, the female screw part 50a has a circumferential rotation angle of only about 90 degrees, but in order to make the contact with the male screw part 40a more firm, it is 90 degrees or more and less than 180 degrees. It can be arbitrarily set within the range.

Next, the operation | movement at the time of the screw fastening in this embodiment is demonstrated using FIG. 1 and FIGS.
In FIG. 1, when the trigger switch 7 of the screw tightening tool 2 is pulled and a motor (not shown) is turned on, the driver bit 12 rotates and the sleeve 40 rotates accordingly. A male threaded portion 40a is formed on the outer periphery of the sleeve 40, and the male threaded portion 40a meshes with the female threaded portion 50a of the half nut 50. Therefore, the sleeve 40 is rotated by the action of the female threaded portion 50a and the male threaded portion 40a. 40 moves forward against the force of the cone spring 41. The screw thread direction of the male screw portion 40a and the female screw portion 50a is determined so that the sleeve 40 moves forward when the driver bit 12 rotates forward. As a result, the head of the screw 80 is pushed forward by the sleeve 40 and moves forward. Since the screw 80 is made of iron or an iron-based alloy, the screw 80 is attracted by the magnetic force of the magnet 120 on the side thereof, and therefore does not fall forward from the passage hole 30a of the sliding body 30 during this advancement. .

  When the screw 80 further advances by the action of the sleeve 40 and the half nut 50, the tip of the screw 80 passes through the screw retainer 92. When the head advances further, the head of the screw 80 passes through the side of the magnet 120 and moves forward from the position where the magnet 120 is located as shown in FIG. 7, but the magnetic flux of the magnet 120 passes through the sleeve 40 and the screw 80 Since the magnetic path is formed through the sliding body 30, the adsorption effect by the magnet 120 is maintained. Thus, the screw 80 is held in the passage hole 30a by the sleeve 40 and the screw retainer 92. Further, as shown in FIG. 7, if the head of the screw 80 protrudes forward from the screw retainer 92, the screw 80 is sufficiently held even without the magnetic force of the magnet 120.

  Thus, when the advancement of the screw 80 is completed, the operator releases the trigger 7 and stops the idling of the screw tightening tool 2. Since the screw 80 is protruded and held from the screw retainer 92, the operator can visually determine the screw tip at the center of the hole 110a of the joint fitting 110. As described above, the screw tightening machine according to the present embodiment can project the screw 80 to be screwed from the sliding body 30 only by pulling the trigger switch 7 to idle the driver bit 12.

  Even if the driver bit 12 is forgotten to stop rotating and continues to rotate, the female screw portion 50a of the half nut 50 and the screw 40a are not meshed with each other, so that the sleeve 40 continues to idle and the screw 80 is moved forward. Never move to. At this time, since the half nut 50 is fixed to the leaf spring 51 and the leaf spring 51 is fixed to the sliding body 30, since the half nut 50 always tries to mesh with the screw 40a by the elasticity of the leaf spring, a sound is generated. It is possible to detect that the screw has moved a predetermined distance without visual observation.

  The operator aligns the tip of the screw 80 with the hole 110a of the joint fitting 110, and then pushes the screw tightening tool 2 toward the joint fitting forward while pulling the trigger switch 7 again to rotate the driver bit 12. Then, while the spring 9 is compressed, the sliding body 30 moves so as to approach the screw tightening tool 2, the deformed hole of the head of the screw 80 and the tip of the driver bit 12 are engaged, and the screw 80 starts rotating by the driver bit 12. Tightening of the screw 80 to the workpiece 111 is started. FIG. 8 shows this state. A distance L shown in FIG. 8 is a movement range of the distal end portion of the sleeve 40, and the magnet 120 is provided on the sliding body 30 in a region within the movement range L.

  FIG. 9 is a longitudinal sectional view of the vicinity of the tip of the sliding portion 30 as seen from another angle. This figure is a cross-sectional view of the plane rotated 90 degrees with respect to FIG. 8 when viewed in the axial direction of the driver bit 12. FIG. 9 shows a state in which the screw tightening tool 2 is further pressed forward from the state of FIG. Since one end of the cylindrical passage formed by the pair of screw retainers 92 is chamfered in a conical shape, the head of the screw 80 is moved by deforming the leaf spring 90 and moving the screw retainer 92 in the direction of the arrow. I can pass. The chamfered portion is the guide surface 92a. At this time, the plate 52 rides on the notch 22c, the half nut 50 moves outward (rightward in the figure), the sleeve 40 is disengaged from the screw 40a, and is moved upward by the urging force of the cone spring 41. Return.

  FIG. 10 shows a state where the screw 40a on the outer periphery of the sleeve 40 and the half nut 50 are disengaged. When the guide pipe 22 further descends and the plate 52 reaches the position of the notch 22c from the notch 22b, the notch 22c has a narrow width so that the plate 52 comes into contact with the guide pipe 22 and comes into contact with the projecting end of the outer periphery. Thus, the half nut 50 rides (moves) outward (rightward in the figure). As a result, the female threaded portion 50a of the half nut 50 and the male threaded portion 40a of the sleeve 40 are completely separated, so that the sleeve 40 is pushed back by the cone spring 41, and the sleeve 40 can return to the initial position.

  As shown in FIG. 11, when the screw tightening tool 2 is further pressed forward, the rotating driver bit 12 is further lowered, and the joining bracket 110 is firmly fixed to the screw tightening material 111, and the tightening operation is completed. To do. FIG. 12 shows a cross section of this state viewed from another angle.

  Thereafter, when the screw tightening tool 2 is lifted, the sliding body 30 returns to the state shown in FIG. Further, since the driver bit 12 passes through the passage hole 30a and returns to the original state, the screw 80-2 moves until the head of the next screw 80-2 pressed by the push plate 78 comes into contact with the inner wall of the sliding body 30. The head of the screw 80-2 is located immediately below 12, so that the next screw tightening can be performed.

  As described above, according to the present embodiment, it is possible to accurately position a screw in a hole such as a joint fitting stop before the start of screw tightening, and to provide a user-friendly screw tightener. In addition, it is possible to realize a tightening machine that can reliably feed the individual screws one by one with a simple configuration and project the tip of the screw from the sliding portion before tightening.

  As mentioned above, although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, an example in which an electric impact driver is used as a screw tightening tool has been described. However, the present invention is not limited to an electric tool, and an air tool powered by air, an engine tool, or the like is used. It is also possible. Moreover, in the above-mentioned embodiment, although the attachment port which mounts a screw was formed in the position which inserts the head of a screw from the front side of a screw fastening tool, it is not only from the front side but side or back. You may form in the position which inserts from the side. Furthermore, in the above-described embodiment, an example in which a driver bit having a square tip and a screw corresponding thereto is used has been described, but the shape of the driver bit and the material to be fastened are not limited to these combinations, Shaped driver bits, screws, bolts, etc. can be used.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole screw fastening machine which concerns on embodiment of this invention, and shows a longitudinal cross-section side view in part. It is the side view seen from the A direction of the screw fastening machine shown in FIG. It is sectional drawing of the BB part of FIG. It is a fragmentary sectional view of the CC section of FIG. (1) is sectional drawing of the DD section of FIG. 1, (2) is sectional drawing of the EE part of FIG. It is a figure which shows the shape of the sleeve 40 and the half nut 50, (1) is a rear view, (2) is a side view, (3) is a front view. It is side surface sectional drawing of the front-end | tip part which shows the state which the sleeve descend | falls and the front-end | tip of the screw protruded from the main body with the screwing machine which concerns on embodiment of this invention. It is side surface sectional drawing of the front-end | tip part which shows the state which the front-end | tip of the driver bit meshed | engaged with the deformed hole of the screw head protruded from the main body with the screwing machine which concerns on embodiment of this invention. It is another sectional view in a screwdriver bit axis showing operation during screw tightening with a screw tightening machine concerning an embodiment of the present invention. It is sectional drawing of the EE part of FIG. It is side surface sectional drawing of the front-end | tip part which shows the state which completed the screwing with the screwing machine which concerns on embodiment of this invention. It is side surface sectional drawing from another angle of the front-end | tip part which shows the state which screwing was completed with the screwing machine which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw tightening machine 2 Screw tightening tool 3 Sliding part 4 Magazine part 5 Guide part 7 Trigger switch 8 Spring seat 9 Spring 10 Spindle case 11 Spindle 12 Driver bit 20 Holder 21 Set screw 22 Guide pipe
22a, 22b, 22c (notch of guide pipe) 23 Set screw 30 Slider 30a Passage hole 40 Sleeve 40a Male thread part 40b, 40c Cylindrical part 41 Cone spring 42 Flange 50 Half nut 50a Female thread part 51 Leaf spring 52 Plate 53 Bolt 54 Special washer 55 Bolt 60 Retaining ring 70 Magazine case holder 71 Pin 72 Bolt 73 Ribbon spring 74 Magazine case 74a Rib 74b Folding 75 Shaft 76 Ribbon spring holder 78 Push plate 79 Cap 80 Screw 81 Guide groove
81a Mounting port 90 Leaf spring 91 Bolt 92 Screw retainer 92a Guide surface 93 Bolt 95 Bush 100 Notch 110 Joint fitting 110a Hole
111 Screw tightening material 120 Magnet

Claims (8)

A screw tightening tool that rotates the driver bit, a guide portion that is attached to the screw tightening tool and covers the driver bit, and a sliding portion that is movable relative to the guide portion in the axial direction of the driver bit are provided. In the screw tightening machine in which a magazine portion that holds a plurality of screws and sequentially conveys them on the axis of the driver bit is fixed to the sliding portion,
The magazine portion has a guide groove for holding the head of the screw mounted in a loose state, and the guide groove is formed with a mounting opening for mounting the head of the screw in the guide groove. A screw tightening machine characterized by   The screw tightening machine has a moving mechanism for moving the conveyed screw forward in the axial direction using the rotational force of the driver bit, and the moving mechanism does not slide the magazine portion in the axial direction. The screw tightening machine according to claim 1, wherein the screw protrudes forward from the sliding portion.   The screw tightening machine according to claim 2, wherein the mounting opening is formed at a position where a screw head is inserted from a front side of the screw tightening tool. The moving mechanism includes a sleeve that is provided on the outer peripheral side of the driver bit and between the guide part and that is rotated by the driver bit and is slidable in the axial direction.
The screw tightening machine according to claim 2 or 3, wherein a magnet for attracting the screw to be moved is provided in the sliding portion adjacent to the path along which the sleeve advances.   The screw tightening machine according to claim 4, wherein the sleeve has a cylindrical shape, and an inner peripheral side of the sleeve has a polygonal shape corresponding to an outer shape of the driver bit.   The screw tightening machine according to claim 4, wherein the sleeve is made of iron, and the magnetic force of the magnet acts on the screw via the sleeve.   5. The screw tightening machine according to claim 4, wherein the moving mechanism includes a male screw portion formed on an outer periphery of the sleeve, and a half nut provided at a position corresponding to the male screw portion and having a female screw portion.   The sliding part is provided with gripping means for holding the tip of the screw in a state protruding from the sliding part, and the gripping means has two members separated in the axial direction and the vertical direction. The screw tightening machine according to any one of claims 1 to 7.

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