JP4016785B2 - Reinforcing bar binding machine and reel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a reinforcing bar binding machine that binds and fixes intersecting reinforcing bars with a wire and a reel thereof, and more specifically, a reinforcing bar binding machine that prevents a wire from being detached from a case when the wire is fed out and the reel binding machine. Reel related.
[0002]
[Prior art]
Conventionally, as a reinforcing bar binding machine, a wire reel brake mechanism (see Patent Document 1) in a reinforcing bar binding machine has been filed by the applicant of the present application.
[0003]
FIG. 25 shows the reinforcing bar binding machine, in which a reel 2 around which a wire 3 is wound is held around the rear part of the reinforcing bar binding machine 1. The wire 3 drawn out from the reel 2 is fed forward by the wire feeding means 5 to the reinforcing bar binding machine 1, and when it is fed along the guide 6 having a groove extending in an arcuate shape, it is curled and cross-shaped. A loop is formed around the reinforcing bars 7 that intersect. After the wire 3 wound around the reinforcing bar 7 in a loop shape is caught by the sandwiching portion 4, the wire feed of the wire feeding means 5 is stopped, and the wire 3 wound in a loop shape is connected to the wire 3 at the tip portion. The torsional hook 8 having a groove for sandwiching is approached. The twisting hook 8 rotates the wire 3 after the wire 3 is inserted into the groove and binds the reinforcing bars 7 with the wire 3. After the rebar 7 is bound, it is cut by a cutting means provided in the holding part 4 so that the holding part 4 releases the wire 3.
[0004]
A cassette case (not shown) for holding the reel 2 is provided at the rear part of the reinforcing bar binding machine 1, and an optical sensor is disposed at a portion facing the side surface of the reel 2 of the cassette case. A mark detected by the sensor is provided.
[0005]
The optical sensor irradiates light toward the side surface of the reel 2 to detect reflected light from the mark. When the reel 2 is rotating, the optical sensor periodically detects the reflected light.
[0006]
When the wire 3 of the reel 2 is consumed, since the reel 2 does not rotate, the optical sensor does not detect periodic reflected light from the mark, so that it can be determined that the wire 3 has been consumed. .
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-104777
[0008]
[Problems to be solved by the invention]
However, in the case of such a reinforcing bar binding machine 1, if the optical sensor is exposed to the outside, the optical sensor malfunctions or consumes the wire 3 due to ambient light entering from the gap between the reel 2 and the cassette case. When replacing the reel 2 or when the reel 2 is removed, the optical sensor becomes dusty or dirty, and the mark on the reel 2 cannot be detected. Therefore, the optical sensor cannot detect periodic reflected light and malfunctions. There was a problem to do.
[0009]
The present invention has been made paying attention to such problems, and in a reinforcing bar binding machine that detects the end of a wire by detecting the stop of rotation of a reel by an optical sensor, malfunction due to detection of ambient light or adhesion of dust or the like. An object of the present invention is to provide a reinforcing bar binding machine and a reel that are reliably detected by an optical sensor.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 of the present application is such that a reel mounting shaft is formed on a case attached to a binding machine body, and a reel around which a wire for reinforcing bar binding is wound is mounted on the reel mounting shaft. In the rebar binding machine for twisting the wire and binding the rebar after winding the wire in a loop around the rebar when feeding the wire while rotating the reel,
An area in which an optical sensor facing the side surface of the reel is installed at the bottom of the case, an opaque cover that covers the optical sensor is rotatably held on the reel mounting shaft, and the area of the cover passes above the optical sensor Forming an opening in the
A detected means having a reflected light amount different from the reflected light amount of the cover is provided at a portion of the reel disposed on the bottom side of the case.
[0011]
The reel according to claim 2 of the present application is a reel used in the reinforcing bar binding machine according to claim 1, and a reflected light amount different from the reflected light amount of the cover is applied to a portion of the reel disposed on the bottom side of the case. The present invention is characterized in that the detected means is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a reinforcing bar binding machine and a reel used for the same according to an embodiment of the present invention will be described with reference to the drawings.
[0013]
FIG. 7 schematically shows the configuration of a reinforcing bar binding machine according to this embodiment.
[Configuration of rebar binding machine]
In the reinforcing bar binding machine 20, a pair of abutting plate portions 23 to be applied to the reinforcing bars 22 are formed at the lower part of the front end portion directed to the reinforcing bars 22 of the binding machine body 21, and a wire is attached to the tip portion between the pair of the abutting plate portions 23. A twisting hook 25 having an insertion groove 24 is provided.
[0014]
The twisting hook 25 can be rotated by an electric motor 26. The twisting hook 25 has the wire insertion groove 24 parallel to the loop-shaped wire 27 so that the wire 27 bent into a loop shape can be easily inserted into the wire insertion groove 24 during standby before the electric motor 26 starts rotating. And is waiting at a position away from the wire 27.
[0015]
The twisting hook 25 is held by the electric motor 26 via the advance / retreat mechanism 29. The advancing / retracting mechanism 29 is constituted by, for example, a cam mechanism, and the wire 27 is inserted into the wire insertion groove 24 of the twisting hook 25 when the electric motor 26 starts to rotate, and when the electric motor 26 stops rotating, the twisting hook 25 is placed in the standby position. Retreat to.
[0016]
That is, when the trigger 28 is pulled and the electric motor 26 starts to rotate, the twisting hook 25 extends to the wire 27 side, inserts the wire 27 into the wire insertion groove 24, rotates, and returns the trigger 28. To stop the rotation and return to the original standby position.
[0017]
The binding machine body 21 is provided with a wire passage 30 through which the wire 27 is passed. The wire passage 30 is formed from the rear end portion of the binding machine main body 21 to the guide portion 31 for attaching the curl. The guide portion 31 is curved in an arc shape, and the wire passage 30 is a groove having an open arc inside the guide portion 31. A gear 33 attached to the output shaft of the motor 32 is disposed at the rear portion of the binding machine body 21 in the wire passage 30. The gear 33 faces an opening (not shown) provided in the wire passage 30, and the gear 33 presses the wire 27 against the bottom of the wire passage 30.
[0018]
When the micro switch 38 is turned on by the trigger 28, the motor 32 rotates to send the wire 27 to the front or rear of the binding machine body 21. The forward / reverse rotation control of the motor 32 is performed by a control circuit (not shown) built in the binding machine body 21. For example, after winding the wire 27 around the reinforcing bar 22 in a loop, the wire 27 is moved to the cassette. Pulling toward the case 40 side reduces the looseness of the wire 27.
[0019]
Wire gripping / cutting means 34 is disposed at a portion where the wire passage 30 reaches the guide portion 31. The wire gripping / cutting means 34 includes, for example, a pair of gripping portions and a pair of cutting blades, and the wire 27 passes between the pair of gripping portions and between the pair of cutting blades. When the feed amount of the wire 27 reaches a predetermined amount based on the rotation amount of the motor 32, the wire cutting and gripping means 34 grips the end portion of the wire 27 with a pair of grip portions. After the rebar 22 is wound in a loop shape, the front end portion of the wire 27 and the rear end portion of the loop are twisted by the twisting hook 25 in a state of being gripped by the pair of gripping portions, and after the rebar 22 is bound, The cutting blades are rubbed together to cut the wire 27.
[0020]
A reel mounting bearing 35 is formed at the rear end of the binding machine body 21. An attachment shaft 36 projects from the bearing portion 35, and a cassette case 40 is detachably attached to the attachment shaft 36. A reel 41 (see FIGS. 1 and 2) is attached inside the cassette case 40. The cassette case 40 is formed with an opening (not shown) for drawing out the wire 27. The opening of the cassette case 40 opens toward the wire passage 30.
[0021]
1 to 5 show an embodiment of a cassette case 40 and a reel 41 of a reinforcing bar binding machine. The cassette case 40 constitutes a part of the reinforcing bar binding machine 20.
[Cassette case]
The cassette case 40 is made of a plastic having excellent resistance to wear and bending, such as polypropylene, and a reel mounting in which the mounting shaft 36 of the bearing portion 35 is inserted and fixed to the bottom 42B of the cassette case 40. A shaft 43 is projected.
[0022]
The upper part of the cassette case 40 is opened to insert the reel 41, and this opening is closed by a lid 42A. The tip end portion of the reel mounting shaft 43 can be fitted into the cylindrical projection P at the center of the lid 42A.
[0023]
A sensor installation hole 44 is opened in the bottom portion 42 </ b> B of the cassette case 40, and a reflection type interrupter 45 is installed as an optical sensor inside the sensor installation hole 44. Reference numeral 45A denotes a terminal plate to which the interrupter 45 is attached. The terminal plate 45A has a ring-shaped opening larger than the reel attachment shaft 43 so that the attachment shaft 36 is inserted into the reel attachment shaft 43. . One end of the terminal board 45A is fixed to the bottom 42B of the cassette case 40 with a screw 45B. A cable 45C connected to the control circuit is connected to the terminal board 45A so that power is supplied to the interrupter 45 and an output signal of the interrupter 45 is transmitted to the control circuit.
[0024]
The control circuit detects the rotation of the reel 41 based on the output signal from the interrupter 45. That is, the control circuit determines that the reel 41 is not rotating when the output voltage fluctuation from the interrupter 45 is not detected within a predetermined time even though the electric power to be rotated is supplied to the motor 32. Then, the operator informs the operator that the wire 27 of the reel 41 has been terminated, for example, by causing an LED or the like provided on the side surface of the reinforcing bar binding machine 1 to emit light.
[cover]
An opaque cover 46 that covers the top of the interrupter 45 is rotatably attached to the base of the reel attachment shaft 43. The cover 46 is formed of black plastic so that the difference in brightness from the reel 41 is large. As shown in FIG. 6, a pair of openings 47 are formed at positions where the cover 46 passes over the interrupter 45. An opening 48 at the center of the cover 46 is an opening into which the reel mounting shaft 43 is inserted. The cover 46 is restricted from moving up and down by a retaining ring 49 attached to the reel attachment shaft 43 (see FIG. 1).
[reel]
2 to 5 show the shape of the reel 41. The reel 41 is made of a plastic having excellent resistance to wear and bending, such as polypropylene, and is made of white plastic so that the amount of reflected light is increased. A wire 27 is wound around the reel 41, and the wire 27 can move forward or backward of the binding machine body 21 as the gear 33 rotates. The reel 41 can be rotated forward and backward in response to the feeding and unwinding of the wire 27.
[0025]
The reel 41 includes a hub 41 </ b> A around which the wire 27 is wound and the reel mounting shaft 43 is inserted, and a pair of flanges 50 that restrict the displacement of the wire 27 in the left-right direction.
[0026]
The hub 41A includes an inner cylinder portion 51A into which the reel mounting shaft 43 is inserted and an outer cylinder portion 51B around which the wire 27 is wound. The inner cylinder part 51A and the outer cylinder part 51B are connected by an intermediate plate part 51C and a rib 51D, and a protrusion 53 is formed as a detected means on the rib 51D. As shown in FIGS. 3 and 4, a fitting recess 51E is formed at the end of the inner cylinder 51A facing the lid 42A, and the circular protrusion P of the lid 42A is fitted into the fitting recess 51E. The reel mounting shaft 43 is inserted into the hub hole 51 inside the inner cylinder portion 51A.
[0027]
The flange 50 is thinned as much as possible to reduce cost and weight. As shown in FIG. 5, an attachment groove 52 for fixing the end portion on the winding start side of the wire 27 is formed in one flange 50.
[0028]
As shown in FIGS. 1 and 2, a recess 53A is formed on the surface of the reel 41 facing the bottom 42B of the cassette case 40, and the retaining ring 49 of the reel mounting shaft 43 is located in the recess 53A. A pair of protrusions 53 are formed on the bottom of the recess 53A. The pair of protrusions 53 are each formed in a cylindrical shape so as to fit into the opening 47 of the cover 46 without any gap. Between the recess 53A and the flange 50, a thick portion 53B that contacts the cover 46 and prevents light from entering the recess 53A is formed in a ring shape.
[0029]
Further, a thick portion 42C that supports the flange 50 on the bottom side of the reel 41 is formed on the bottom portion 42B of the cassette case 40, and a concave portion 42D is formed between the reel mounting shaft 43 and the thick portion 42C. The concave portion 42D forms a gap between the interrupter 45 and the projection 53, and the thick portion 42C and the cover 46 are rotated in sliding contact with each other, so that the light is shielded and disturbance light is prevented from entering the interrupter 45.
[0030]
[Reel rotation detection]
The pair of protrusions 53 pass above the interrupter 45 when the reel 41 rotates. At this time, since the cover 46 is black and the pair of protrusions 53 are white, the amount of reflected light emitted from the interrupter 45 is larger than the amount of reflected light from the cover 46. The interrupter 45 receives the reflected light and outputs it to the control circuit. The control circuit detects the rotation of the reel 41 based on a change in the output voltage of the interrupter 45.
[0031]
When the wire 27 is wound around the reel 41, when electric power to be rotated is applied to the motor 32, the reel 41 is rotated by pulling out the wire 27, so that the pair of protrusions 53 periodically pass over the interrupter 45. Thereby, the interrupter 45 detects the reflected light of the black cover 46 and the reflected light of the white protrusion 53.
[0032]
Since the amount of reflected light from the white protrusion 53 is larger than the amount of reflected light from the black cover 46, the output voltage of the interrupter 45 changes periodically. When this periodic change can be detected at regular intervals within the time during which the motor 32 is rotating, the reel 41 is rotating.
[0033]
If the output voltage from the interrupter 45 does not change within a certain time despite the motor 32 rotating, the reel 41 is not rotating.
[0034]
Therefore, the control circuit can determine the rotation of the reel 41 based on the rotation of the motor 32 and the change in the output voltage of the interrupter 45.
[0035]
Even if the reel 41 is not white, the surface of the vertex 53T of the protrusion 53 may be white, or a sticker or the like may be attached. Further, the cover 46 may be white and the reel 41 may be black.
[0036]
In the above embodiment, the detected means is constituted by the protrusion 53, and the reflected light amount is made different from that of the cover by changing the color brightness of the protrusion 53. However, as the detected means, a conical or A plurality of small protrusions or small recesses formed of a hemispherical shape or a stepped portion / groove may be formed, or rough surface treatment may be performed.
[0037]
Alternatively, as another example of the detected means, as shown in FIG. 3 (2), a through hole 53H may be formed in a portion on the bottom side of the reel 41, but a dent or A plurality of small protrusions or small recesses formed of a conical shape, a hemispherical shape, or a stepped portion / groove may be formed, or rough surface treatment may be performed.
[0038]
Another embodiment of the cassette case and the reel will be described with reference to FIGS. The cassette case 70 is made of a plastic having excellent resistance to wear and bending, such as polypropylene, and includes a bottom portion 71 and a peripheral wall 90 formed around the bottom portion 71 as shown in FIGS.
[0039]
The bottom portion 71 includes a first bottom portion 72 and a second bottom portion 75 connected to the linear connecting portion 73 of the first bottom portion 72. The first bottom portion 72 includes a substantially circular base portion 76 and a trapezoidal portion 77 surrounded by a straight edge extending from the peripheral edge of the base portion 76 to the connecting portion 73. The second bottom portion 75 is formed in a substantially rectangular shape.
[0040]
A cylindrical reel mounting shaft 79 is provided at a substantially center of the base portion 76 of the first bottom portion 72 so that the mounting shaft 36 of the bearing portion 35 is inserted and fixed. Further, the base 76 of the first bottom 72 has a first storage recess 80 for storing a post-described small flange 152 centered on the reel mounting shaft 79 and a second storage recess 81 for storing a post-cover cover 132. Is formed. A taper 82 is formed around the first bottom portion 72, and a small flange 152 of the wire reel 150 to be described later is guided into the first storage recess 80 by the taper 82.
[0041]
A locking wall 85 in which a semicircular insertion hole 83 is formed is formed at the upper end of the reel mounting shaft 79. In addition, a through hole 86 is formed in the second storage recess 81, which is the first bottom portion 72, and an optical sensor 87 is provided in the through hole 86.
[0042]
The first peripheral wall 91 including the first peripheral wall 91 provided on the first bottom portion 72 and the second peripheral wall 95 provided on the second bottom portion 75 is formed on the periphery of the base portion 76. The second peripheral wall 95, which is composed of the annular peripheral wall 92 and the first side wall 93 and the second side wall 94 formed at both linear edges of the trapezoidal portion 77, is one end edge of the second bottom portion 75. Are provided in a straight line. The connecting portion 73 is provided with a partition wall 96 that divides the first bottom portion 72 and the second bottom portion 75 substantially in half. Guide protrusions (steps) 92a, 93a, 94a are formed at the upper ends of the circumferential wall 92 and the first and second side walls 93, 94. Engagement recesses 92b and 92c are formed in the guide protrusion (step) 92a of the circumferential wall 92.
[0043]
In the cassette case 70, an arm 97 is provided on the circumferential wall 92, and an anti-rotation hole 97 a is formed in the arm 97. The cassette case 70 is fixedly attached to the binding machine main body 21 by being attached to the attachment shaft 36, inserting a bolt through the rotation stop hole 97a, and screwing it to one side of the binding machine main body 21. Further, the cassette case 70 has a pair of bearing projections 98, 98 formed on the first side wall 93.
[0044]
The cassette case 70 has an opening 99 into which the wire reel 150 can be inserted, and a lid 100 that closes the opening 99 is hinged. The lid 100 is made of the same material as that of the cassette case 70, and includes a first lid 101 and a second lid 105 as shown in FIGS. The first lid portion 101 includes a substantially circular base portion 102 and a trapezoidal portion 103. The second lid portion 105 is formed in a substantially short shape. Engaging convex portions 102b and 102c that engage with the engaging concave portions 92b and 92C of the circumferential wall 92 are formed on the periphery of the base portion 102. Further, a side wall 104 is formed at the edge opposite to the post-hinge connecting portion of the second lid portion 105.
[0045]
A guide hole 106 is formed substantially at the center of the base 102 of the first lid 101. On the surface of the base portion 102, a circular concave portion 107 centering on the approximate center of the guide hole 106 is formed. Further, an annular guide protrusion 109 centering on the approximate center of the guide hole 106 is provided on the surface of the base portion 102. On the inner surface of the base portion 102, a cylindrical protrusion 110 centering on the approximate center of the guide hole 106 is provided. On the inner surface of the base portion 102, an annular guide protrusion 108 is formed to guide the wire reel 150 in sliding contact with the vicinity of the outer peripheral edge of the large flange 153 of the wire reel 150 described later. Further, a stopper piece 102a formed by being cut out in a substantially U shape is formed on the base portion 102 so as to protrude from the surface. A ring-shaped adjusting annular member 121 shown in FIG. 13 is rotatably attached to the annular guide protrusion 109.
[0046]
Locking means 120 is provided in the recess 107 of the lid 100. As shown in FIG. 12, the locking means 120 includes a circular rotating portion 111, finger-hook arms 112 and 113 provided at both ends of the rotating portion 111, and a cylindrical shape formed substantially at the center of the rotating portion 111. And a locking shaft 115. The locking shaft 115 is formed in a half shape, and one half 116 is longer than the other half 117. Locking protrusions 116a and 117a are formed at the lower portions of the half bodies 116 and 117, respectively. A locking groove 119 is formed in the lower part of one half 116. A first locking recess 123 and a second locking recess 125 are formed on the back surface of the finger hanging arm 113.
[0047]
As shown in FIG. 22, the locking means 120 has a locking shaft 115 inserted through the guide hole 106 of the lid 100, and locking protrusions 116 a and 117 a formed on the locking shaft 115 are locked to the inner surface of the base portion 102. Then, it is rotatably mounted in the recess 107 of the lid 100. The locking means 120 abuts on the adjusting annular member 121 and is integrally connected to the adjusting annular member 121 by a screw or the like. The locking means 120 is positioned by the stopper piece 102a of the lid 100 being locked to the first locking recess 123 or the second locking recess 125 of one finger-hanging arm 113.
[0048]
In addition, as shown in FIG. 13, the adjustment annular member 121 is formed with first to fourth attachment portions 121a to 121d having different thicknesses. The thickness increases in order from the first mounting portion 121a, and the thickness of the fourth mounting portion 121d is the thickest. A pair of first to fourth attachment portions 121a to 121d are provided to face each other. Further, first to fourth screw holes 122a to 122d are formed in the first to fourth mounting portions 121a to 121d. On the other hand, the locking means 120 to which the adjusting annular member 121 is connected is formed with protruding trapezoidal contact portions 118, 118 on both sides of the back surface of the rotating portion 111, and screwed holes are formed in the contact portions 118, 118. 114, 114 are provided. The locking means 120 joins the contact portions 118, 118 to the thinnest first mounting portions 121 a, 121 a of the adjustment annular member 121, and passes screws through the screw through holes 114, 114, By screwing into the screw holes 122a, 122a, the locking shaft 115 protrudes the longest from the adjustment annular member 121. Similarly, the locking means 120 joins the abutting portions 118 and 118 to the thickest fourth mounting portions 121d and 121d of the adjustment annular member 121, passes the screws through the screw through holes 114 and 114, and By screwing into the fourth screw holes 122d, 122d, the locking shaft 115 protrudes the shortest from the adjustment annular member 121. Thus, the locking means 120 can adjust the protruding length of the locking shaft 115 by the adjusting annular member 121.
[0049]
In the lid 100, a pair of bearing protrusions 128 and 128 are formed on one side edge 126 of the trapezoidal portion 103, and the pair of bearing protrusions 128 and 128 are inserted between the bearing protrusions 98 and 98 of the cassette case 70. The support shaft 130 is inserted into the pair of bearing protrusions 128 and 128 and the pair of bearing protrusions 98 and 98, and is attached to the cassette case 70 with the support shaft 130 as a center so as to be opened and closed. Furthermore, a coil spring-like elastic member (not shown) is wound around the support shaft 130, and the lid 100 is urged in the opening direction by this elastic member.
[0050]
A cover plate 132 is rotatably housed in the second housing recess 81 of the cassette case 70. As shown in FIG. 14, the cover plate 132 is formed in a ring shape, and is formed with locking recesses 133 to 138 at six locations at equal intervals, and the six locking recesses 133 to 138 are arbitrarily opposed to each other. The locking recesses 133 and 136 are through holes. The locking recesses 133 to 138 pass over the optical sensor 87. In addition, inclined surfaces 133a to 138a are formed toward the locking recesses 133 to 138.
[0051]
A flange 139 that is locked to the periphery of the second storage recess 81 is provided on the outer peripheral edge of the cover plate 132 at one end. The cover plate 132 is housed in the second housing recess 81 so that the locking recesses 133 to 138 face the lid 100 and is fitted into an annular groove 78 formed in the reel mounting shaft 79. An elastic ring 140 such as a snap ring prevents the reel mounting shaft 79 from moving in the axial direction.
[0052]
Next, the wire reel 150 will be described with reference to FIGS.
FIG. 15 is a front view of the wire reel 150. The wire reel 150 is made of plastics such as ABS resin and polyethylene, and a pair of flanges 152 and 153 are formed on both sides of the hub portion 151 around which the wire 27 is wound. The hub portion 151 is formed in a cylindrical shape, and is integrally formed with a pair of flanges 152 and 153. The hub portion 151 is formed in a cylindrical shape, but may be another polygonal shape.
[0053]
The pair of flanges 152 and 153 have disk shapes with different diameters, and the height from the peripheral surface of the hub portion 151 to the outer peripheral edge of the flange 152 having a small diameter is a height obtained by winding the wire 27 in an unused state. It is set higher than this. The height of the flange 153 having a large diameter has a height that allows the winding end end 27E of the unused wire 27 to be held without being significantly bent from the wound state. When the wire reel 150 is attached to the reinforcing bar binding machine 20, it is easy to check the attachment method of the wire 27 because the pair of flanges 152 and 153 have different diameters.
[0054]
A mounting hole 155 into which the reel mounting shaft 79 of the reinforcing bar binding machine 20 is inserted is formed in the central portion of the hub portion 151. The edge having a larger diameter due to the draft of the mounting hole 155 forms a flat surface 156 that is one step lower than the flange 152, and six projections 157 are formed on the flat surface 156. A recess 160 having inner surfaces 158 and 159 concentric with the flange 152 is formed between the adjacent protrusions 157. In addition, a protrusion 157 is formed on the wall 161 between the adjacent recesses 160. Six recesses 162 into which the protrusions 157 are inserted are formed on the other surface of the hub portion 151.
[0055]
The six protrusions 157 and the recesses 162 are arranged so that the overall arrangement shape forms a substantially hexagonal shape. The inner wall surface 163 on the outer peripheral edge side of the concave portion 162 forms a concentric arc with the mounting hole 155, and the peripheral surface portion 165 near the outer peripheral edge portion of the flange 153 of the six protrusions 157 is formed on the inner wall surface 163. By fitting in a state having frictional resistance, a state in which the six protrusions 157 and the six concave portions 162 are coupled to each other is generated.
[0056]
That is, in this embodiment, a pair of flanges 152 and 153 that restrict movement of the wound wire 27 in the thickness direction rises from the hub portion 151 around the hub portion 151 around which the wire 27 is wound. The projections 157 and the recesses 160 as coupling means are formed on one side surface 156 or the other side surface 166 of the hub portion 151 so that they can be coupled to each other.
[0057]
As an example, each of the coupling means includes six protrusions 157 and recesses 160, but the protrusions 157 and recesses 160 may include at least two or three. Further, instead of the protrusion 157, an arc-shaped convex portion extending concentrically in the hub portion 151 may be formed, and the concave portion 160 may have a shape into which the arc-shaped convex portion is fitted. Further, the coupling means may be composed of a plurality of arcuate convex portions that can be coupled to each other, one having a small diameter and the other having a large diameter.
[0058]
In FIG. 17, the protrusion 157 is drawn thin, but is because it is a cross-sectional view taken along line III-III of the wire reel 150 in FIG. 15, and as shown in FIG. The opening is widened by the draft angle. A step portion is formed at an edge of the mounting hole 155 on the flange 153 side, and a nut or a fixing ring for mounting the wire reel 150 so as not to fall off can be inserted.
[0059]
As shown in FIGS. 16 and 19, a cylindrical hole 168 for detecting the rotational position of the wire reel 150 is formed in the vicinity of the mounting hole 155 of the hub portion 151. A light emitting element and a light receiving element are arranged in the rotation region of the hole 168 of the reinforcing bar binding machine 20, and the rotation state of the wire reel 150 may be determined by passing the hole 168 between the two elements. . The substantially fan-shaped pattern formed on the outer peripheral edge side of the flanges 152 and 153 indicates the shallow concave portions 169 and 170, and the flanges 152 and 153 are thinned.
[0060]
FIG. 16 shows the shape of the large-diameter flange 153. A wire insertion opening 171 extending toward the hub 151 is formed at the outer peripheral edge of the flange 153. The guide opening that extends in accordance with the extending direction of the wire 27 wound around the hub portion 151 has a height at which the wire insertion opening 171 is positioned at the winding end end portion 27E of the wire 27 (see FIG. 16B). A portion 172 is formed. The guide opening 172 is formed with a projecting portion 173 that sandwiches the wire 27, and the protruding portion of the sandwiching portion 173 sandwiches and holds the winding end end portion 27 </ b> E of the wire 27.
[0061]
Further, a groove 174 extending from the guide opening 172 to the outer peripheral edge side is formed. The outer peripheral portion 175 from the groove 174 has flexibility, and a notch 176 is formed at the other edge of the wire insertion opening 171. Since the wire 27 is guided to the outside of the flange 153 in the outer peripheral portion 175 of the groove 174, a force to bend from the wire 27 to the inner side of the flange 153 is applied to the outer peripheral portion 175, but the outer peripheral portion 175 has flexibility. Therefore, the winding end end 27E of the wire 27 can be positioned in the groove 174 and fixed by the elastic force.
[0062]
Further, since the notch portion 176 is provided, the end end portion 27E of the wire 27 is not bent or very little. Further, since it is held inside the groove 174, the winding end end portion 27E of the wire 27 is held at the edge portion of the holding portion 173 without being bent in the radial direction of the reel at the height at which the wire 27 is wound.
[0063]
Thus, since the winding end end 27E of the wire 27 is not bent, when the wire 27 is passed through the wire guide mechanism of the wire binding machine, the winding end of the wire 27 from the holding part 173 and the wire insertion opening 171 is achieved. The winding end end 27E of the wire 27 can be passed through the wire guide mechanism of the wire binding machine without removing the portion 27E, and it does not take time and effort to correct the bending.
[0064]
The wire insertion opening 171 is inserted into a recess 177 (see FIGS. 16C and 16D) as a distal end insertion portion of the hub portion 151 after the winding start end portion 27S of the wire 27 is inserted and flanged across the hub portion 151. It is also used when guiding to the circumferential surface of the hub portion 151 between 152 and 153. The concave portion 177 into which the winding start end portion 27S is inserted is formed on the surface of the hub portion 151 on the flange 153 side, and includes a support wall surface 179 that supports the winding start end portion 27S. Further, on the side portion of the hub portion 151, a restriction recess 180 for restricting movement by inserting the winding start end portion 27S is formed.
[0065]
When winding the wire 27, the winding start end portion 27 </ b> S of the wire 27 is inserted into the distal end insertion portion 177, and the winding start end portion 27 </ b> S is interposed between the flanges 152 and 153 through the restriction recess 180 provided in the side wall portion of the hub portion 151. In this state, winding is started on the circumferential surface of the hub portion 151. As a result, even if a force F in the winding direction acts strongly on the wire 27, the pulling force F can be received at the edge of the wire insertion opening 171.
[0066]
In addition, the winding start end portion 27S of the wire 27 is located in the vicinity of the restriction recess 180 in the direction parallel to the flange 152 (X direction) from the direction perpendicular to the flange 153 (Y direction) and the direction in which the restriction recess 180 extends (Z Direction), and further in the X direction, the flange 153 and the hub portion 151 are repeatedly bent 90 degrees at a short distance, so that the force to extend this part in a straight line requires a large force. Become. Furthermore, since the recessed part 177 supports the part inserted by the support wall surface 179, the location which supports the tension | pulling force F increases, and the wire binding machine cannot pull out easily with the force which pulls the wire 27. FIG.
[0067]
Therefore, even if the reel is repeatedly rotated in the forward direction and the reverse direction in the reinforcing bar binding machine 20, the restriction recess 180 restricts the winding start end portion 27S of the wire 27 from moving in the circumferential direction of the reel. The winding start end portion 27S of 27 is gradually loosened from the insertion portion, and is prevented from coming off.
[0068]
As a result, even when the remaining amount of the reel wire 27 is reduced during the reinforcing bar binding operation by the reinforcing bar binding machine 20, the bent portion of the winding start end portion 27S may come off from the reel and become jammed in the wire guide mechanism of the wire binding machine. To be prevented. For this reason, in the reinforcing bar binding work, it is possible to avoid the situation of the work stagnation due to the clogging of the wire 27.
[0069]
Note that the opposing protrusions 157A, B of the wire reel 150 in the present embodiment have different heights. In the past, the protrusions 157 are alternately arranged with the high protrusions 157A and the low protrusions 157B. At the upper ends of the protrusions 157A and 157B, a gently curved recess 157C is formed.
[0070]
As shown in FIG. 22, the wire reel 150 is housed in the cassette case 70 from the small flange 152 so that the reel mounting shaft 79 of the cassette case 70 is inserted into the mounting hole 155. The protrusion 157 is locked to the locking recesses 133 to 138 of the cover plate 132.
[0071]
The protrusions 157 locked to the locking recesses 133 and 136 are such that the high protrusions 157A and the low protrusions 157B face each other, and the locking recesses 133 and 136 are through holes. And the low protrusion 157B can be detected. The optical sensor 87 includes a light emitting element and a light receiving element. As described above, the upper end of the protrusion 157 forms a concave portion 157C. Therefore, light emitted from the light emitting element gathers in the light receiving element, and the protrusion 157 is surely formed. Can be detected.
[0072]
The small flange 152 is received by being fitted in the first storage recess 80. The gap between the outer periphery of the small flange 152 and the inner periphery of the first storage recess 80 is narrower than the diameter of the wire 27, and the wire 27 does not come out of this gap. Since the outer diameter of the large flange 153 is larger than the inner diameter of the circumferential wall 92 of the cassette case 70, the large flange 153 is not stored in the cassette case 70 and is in sliding contact with the upper end of the circumferential wall 92.
[0073]
When the lid 100 is closed against the elasticity of the elastic member 131 around the support shaft 130, the cylindrical projection 110 fits the tip of the reel mounting shaft 79 of the cassette case 70, and the hub of the wire reel 150. It is fitted into a fitting recess 154 formed in the portion 151. Further, one half 116 of the locking shaft 115 of the locking means 120 is inserted into the insertion hole 83 of the reel mounting shaft 79, and the rotating portion 111 is rotated by hooking a finger on the finger hook arms 112 and 113. Then, when the stopper piece 102a of the lid body 100 is locked to the second locking recess 125, the locking groove 119 of one half body 116 is locked to the locking wall 85 of the reel mounting shaft 79, and the lid body. 100 is locked to the cassette case 70.
[0074]
When the rotating portion 111 is rotated to lock the stopper piece 102 a of the lid body 100 in the first locking recess 123, the locking groove 119 of one half 116 is locked to the reel mounting shaft 79. The lid 100 is detached from the wall 85, and the lid 100 is automatically opened by the elasticity of the elastic member 131. As described above, when the lid 100 is locked to the cassette case 70, the guide projection 108 of the first lid portion 101 is in sliding contact with the side surface near the outer peripheral edge of the large flange 153 of the wire reel 150. The movement of the hub portion 151 in the axial direction is restricted.
[0075]
As described above, the locking means 120 can adjust the protruding length of the locking shaft 115 by the adjusting annular member 121. Therefore, as shown in FIG. The distance a between the upper end of the circumferential wall 92 of the case 70 can be changed. When the protruding length of the locking shaft 115 of the locking means 120 is increased, the distance a is increased, and when the protruding length of the locking shaft 115 is decreased, the distance a is decreased. Therefore, in the present embodiment, there are four types of thicknesses of the adjustment annular member 121, the first attachment portion 121a to the fourth attachment portion 121d, so that the distance a can be adjusted in four stages. It is not limited to the above, and it may be four stages or more or four stages or less.
[0076]
The large flange 153 of the wire reel 150 is disposed between the guide protrusion 108 of the lid 100 and the upper end of the circumferential wall 92 of the cassette case 70 as shown in FIGS. It is sandwiched between the upper ends. In order for the wire reel 150 to appropriately rotate, the large flange 153 needs to be pressed by a pressing force within a predetermined range by the lid 100.
[0077]
The pressing force received by the large flange 153 varies depending on the distance a, and increases when the distance a is narrow and decreases when the distance a is wide. When the pressing force is large, the resistance received by the large flange 153 increases and the wire reel 150 is difficult to rotate. When the pressing force is small, the large flange 153 rattles within the range of the distance a, and a gap is formed between the large flange 153 and the upper end of the circumferential wall 92. The wire 27 is sandwiched in the gap or the wire 27 is detached from the gap. Therefore, the wire reel 150 cannot be properly rotated.
[0078]
As described above, the pressing force varies depending on the distance a. If the pressing force is not appropriate, malfunction such as defective feeding / returning of the wire 27 occurs. This distance a is a gap formed when the lid body 100 is closed to the cassette case 70 and the lid body 100 is locked by the locking means 120, and it is desirable that the distance a is originally constant, but due to the manufacturing tolerance of each part, It may not be constant when assembled.
[0079]
In the present embodiment, the adjusting ring member 121 having the first to fourth mounting portions 121a to 121d having different thicknesses is provided in the lock unit 120, and the lock unit 120 is rotated by rotating the adjustment ring member 121. Since the protruding length of the locking shaft 115 can be adjusted by screwing to an appropriate mounting portion among the first to fourth mounting portions 121a to 121d of the member 121, the distance a can be set. Even if the distance a is inappropriate based on the manufacturing tolerance of each component described above, it can be adjusted to an appropriate distance a. Therefore, the pressing force within the predetermined range can be ensured, for example, the pressing force of the lid 100 against the wire reel 150 can be adjusted to an appropriate value.
[0080]
Although the distance a varies by rotating the adjusting annular member 121, the lid 100 is moved by the engagement of the engaging concave portions 92c and 92b of the cassette case 70 and the engaging convex portions 102c and 102b of the lid 100. The cassette case 70 is not tightened beyond a certain level. In the above description, the case where the distance a is not an appropriate distance based on the manufacturing tolerances of the cassette case 70, the lid 100, and the lock unit 120 has been described. However, the distance a should also be adjusted for variations in the width of the wire reel 150. Thus, the variation in the width can be absorbed, a pressing force within a predetermined range can be secured, and the feeding / returning failure of the wire reel 150 can be prevented.
[0081]
As described above, the locking device is attached to an opening / closing member (lid body 100) provided to be freely opened and closed on the main body (cassette case 70), and includes a locking means 120 and an adjusting annular member 121. The adjusting ring member 121 has a rotating portion 111 and a locking shaft 115 formed on the rotating portion 111, and the adjusting annular member 121 is rotatably attached to the locking shaft 115 and has a plurality of attachment portions having different thicknesses. 121a to 121d, and the locking means 120 is attached to the attachment portions 121a to 121d. When the locking device is attached to the opening / closing member (lid body 100), the locking means 120 is locked to the main body (cassette case 70). The engagement shaft 115 protrudes from the opening / closing member (lid body 100), and the above-mentioned engagement is achieved by selecting an attachment portion to which the locking means 120 of the adjustment annular member 121 is attached. Thereby making it possible to adjust the protruding length of 115.
[0082]
The lid 100 is fitted inside the guide protrusions (steps) 92a to 94a of the cassette case 70, and the engagement protrusions 102b and 102c are formed in the guide protrusions 92a of the circumferential wall 92. The side wall 104 of the second lid portion 105 is joined to the other end edge of the second bottom portion 75 of the cassette case 70 so that the cassette case 70 can be completely covered.
[0083]
As described above, the cassette case 70 in which the wire reel 150 is accommodated is attached to the reinforcing bar binding machine 20 having a shape as shown in FIGS. As described above, in the wire reel 150, the small flange 152 is fitted in the first storage recess 80, and the large flange 153 is in sliding contact with the upper end of the circumferential wall 92 of the cassette case 70. The wire 27 does not come off from the small flange 152 and the large flange 153 even if the wire 27 is pulled out or pulled back. Further, the accommodation space 88 is secured by the difference in outer diameter between the large flange 153 and the small flange 152, and this accommodation space 88 accommodates the bending of the wire 27 that occurs when the wire 27 is pulled back. The rotation state of the wire reel 150 is determined by the optical sensor 87 detecting the high protrusion 157A and the low protrusion 157B.
[0084]
In the above embodiment, the large flange 153 of the wire reel 150 is not stored in the cassette case 70 and is in sliding contact with the upper end of the circumferential wall 92, but the outer diameter of the large flange 153 can be stored in the cassette case 70. The gap between the cassette case 70 and the circumferential wall 92 may be smaller than the diameter of the wire 27. Even if the outer diameter of the large flange 153 is formed in this way, the housing space 88 is secured by the difference in outer diameter between the large flange 153 and the small flange 152, and the small flange 152 and the large flange 153 are separated from each other. The wire 27 does not come off.
[0085]
【The invention's effect】
According to the reinforcing bar binding machine of claim 1 and the reel of claim 2 of the present application, since the optical sensor provided on the case is covered with the opaque cover, even when the reel is removed, the optical sensor is free from dust and dirt. Is prevented from occurring. Even when the reel is mounted, the detection means with a reflected light amount different from that of the cover is applied to the part facing the optical sensor of the reel, so that the detection means can be distinguished by the optical sensor, and the rotation of the reel is It can be detected by a sensor. For this reason, the presence or absence of the wire of the reel can be reliably detected.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a reel is mounted on a cassette case of a reinforcing bar binding machine according to a first embodiment of the present invention.
FIG. 2 is a bottom view of the reel of FIG.
3 is a cross-sectional view taken along line III-III of the reel of FIG. 2, and FIG. 3 is a cross-sectional view of a modification of (1).
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a rear view of the reel of FIG. 1;
6 is a plan view of a cover attached to the cassette case of FIG. 1. FIG.
FIG. 7 is a side view of the reinforcing bar binding machine according to the embodiment of the present invention.
FIG. 8 is an explanatory diagram of a cassette case according to another embodiment of the present invention.
9 is a cross-sectional view of the main part of FIG.
FIG. 10 is an explanatory view of a lid of a cassette case according to another embodiment of the present invention.
11 is a cross-sectional view of the main part of FIG.
12 is an explanatory diagram of a lock unit attached to the lid of FIG.
13 is an explanatory view of an adjusting annular member attached to the lid of FIG.
FIG. 14 is an explanatory diagram of a cover plate attached to a cassette case.
FIG. 15 is a view showing a configuration of a small-diameter flange side of a wire reel according to another embodiment of the present invention.
16A is a view showing the configuration of the large-diameter flange side of the wire reel of FIG. 15, FIG. 16B is an enlarged view of a portion that holds the winding end of the wire, and FIG. The partial expansion perspective view which shows the structure of a winding start end part, (d) is explanatory drawing which shows the bending state of the winding start end part of a wire.
17 is a cross-sectional view of the wire reel of FIG. 15 taken along the line III-III.
18 is a sectional view taken along line IV-IV in FIG.
19 is a cross-sectional view taken along line VV in FIG.
FIG. 20 is an explanatory diagram showing a configuration in the vicinity of a wire insertion opening and a restriction recess of a flange.
21 is a sectional view taken along line VII-VII in FIG. 20;
FIG. 22 is a cross-sectional view showing a state in which the wire reel is mounted on the cassette case.
FIG. 23 is a side view showing a state in which a cassette case equipped with a wire reel is attached to the binding machine body.
24 is a side view showing a state in which the lid of FIG. 23 is removed.
FIG. 25 is a side view of a conventional reinforcing bar binding machine.
26 is an enlarged explanatory view of the main part of FIG.
[Explanation of symbols]
P Cylindrical projection
1 Rebar tying machine
2 reel
3 wires
4 Clamping part
5 Wire feeding means
6 Guide
7 Reinforcing bars
8 Twist hook
20 Rebar tying machine
21 Binder body
22 Rebar
23 Contact plate
24 Wire insertion groove
25 Twist hook
26 Electric motor
27 wires
28 Trigger
29 Advance / Retreat Mechanism
30 Wire passage
31 Guide section
32 motor
33 Gear
34 Wire gripping and cutting means
35 Bearing part
36 Mounting shaft
38 Micro switch
40 cassette case
41 reel
41A hub
42A lid
42B Bottom
42C Thick part
42D recess
43 Reel mounting shaft
44 Sensor mounting hole
45 Interrupter (light sensor)
45A terminal board
45B screw
45C cable
46 Cover
47 opening
48 opening
49 Retaining Ring
50 flange
51 Hub hole
51A Inner cylinder
51B outer cylinder
51C Intermediate plate
51D rib
51E Fitting recess
52 Mounting groove
53 Protrusion
53A recess
53B Thick part
53T vertex
53H Through hole
70 cassette case
71 Bottom
72 first bottom
73 articulated part
75 second bottom
76 base
77 Trapezoid
78 Annular groove
79 Reel mounting shaft
80 First storage recess
81 Second storage recess
82 taper
83 insertion hole
85 Locking wall
86 Through hole
87 Light sensor
88 containment space
90 wall
91 First wall
92 Circumference wall
92a Guide protrusion (step)
92b engaging recess
92c engaging section recess
93 first side wall
93a Guide protrusion (step)
94 Second side wall
94a Guide protrusion (step)
95 Second wall
96 partition wall
97 arm
97a Non-rotating hole
98 Bearing protrusion
99 opening
100 lid
101 First lid
102 base
102a Stopper piece
102b engagement protrusion
102c engagement convex part
103 trapezoidal part
104 Side wall
105 Second lid
106 Guide hole
107 recess
108 Guide projection
109 Guide protrusion
110 Cylindrical projection
111 Rotating part
112 finger arm
113 Finger arm
114 Screw hole
115 Locking shaft
116 half
116a Locking protrusion
117 half
117a Locking protrusion
118 Contact part
119 Locking groove
120 Locking means
121 Adjustable annular member
121a First mounting portion
121b Second mounting portion
121c Third mounting portion
121d Fourth mounting portion
122a First screw hole
122b Second screw hole
122c Third screw hole
122d Fourth screw hole
123 First locking recess
125 Second locking recess
126 Side edge
128 Bearing protrusion
130 Spindle
131 Elastic member
132 Cover plate
133 Locking recess
133a Inclined surface
134 Locking recess
134a Inclined surface
135 Locking recess
135a inclined surface
136 Locking recess
136a Inclined surface
137 Locking recess
137a inclined surface
138 Locking recess
138a inclined surface
139 Flange
140 Elastic ring
150 wire reel
151 Hub part
152 Small flange
153 Large flange
154 Mating recess
155 Mounting hole
156 plane
157 protrusion
157A Protrusion
157B Protrusion
157C recess
158 inner wall
159 inner wall
160 recess
161 Wall
162 recess
163 inner wall
165 circumference
166 Side
168 holes
169 recess
170 recess
171 Insertion opening
172 Guide opening
173 Nipping part
174 groove
175 Outer part
176 Notch
177 Concave part (tip insertion part)
179 Support wall
180 Restriction recess

Claims (2)

When a reel mounting shaft is formed on a case attached to the binding machine body, a reel around which a wire for binding reinforcing bars is wound is mounted on the reel mounting shaft, and when the wire is fed out while rotating the reel, the wire is In a rebar binding machine for twisting the wire and binding the rebar after being wound in a loop around
An area in which an optical sensor facing the side surface of the reel is installed at the bottom of the case, an opaque cover that covers the optical sensor is rotatably held on the reel mounting shaft, and the area of the cover passes above the optical sensor The reinforcing bar binding machine is characterized in that an opening is formed in a portion of the reel, and a detected means having a reflected light amount different from the reflected light amount of the cover is provided at a portion disposed on the bottom side of the case. A reel used in the reinforcing bar binding machine according to claim 1,
A reel having a reflected light amount different from a reflected light amount of the cover is provided at a portion of the reel disposed on a bottom side of the case.

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