JP4066734B2 - Rebar binding machine, reel and reel rotation detection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a reinforcing bar binding machine that binds reinforcing bars with wires and a reel thereof, and more particularly, to a reinforcing bar binding machine and a reel that detect consumption of wires.
[0002]
[Prior art]
As a reinforcing bar binding machine, “wire reels for binding bars such as reinforcing bars” disclosed in Utility Model Registration No. 2557192 has been filed and registered by the applicant.
[0003]
FIG. 14 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 gripped by the cutting portion 4, when the wire feeding of the wire feeding means 5 stops, the wire 3 wound in the loop shape is turned to the wire 3 at the tip portion. The twisting hook 8 having a groove for sandwiching the wire approaches and is cut by the cutting portion 4, and the twisting hook 8 is rotated by inserting the wire 3 into the groove and rotating to twist the loop-shaped wire 3. The rebar 7 is bound.
[0004]
An arm 9 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 of the arm 9 facing the side surface of the reel 2, and is detected on the side surface of the reel 2 by this optical sensor. Mark 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 detects the reflected light almost periodically.
[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. . In addition, A1 is a twist mechanism and A2 is a trigger.
[0007]
[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 disturbance light entering from the gap between the reel 2 and the arm 9. 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.
[0008]
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 can reliably detect wire consumption by a light receiving means.
[0009]
[Means for Solving the Problems]
  To solve the above problem,
  In the reinforcing bar binding machine according to claim 1 of the present application, a reel mounting shaft is formed on the binding machine body, a reel around which a reinforcing bar binding wire is wound is mounted on the reel mounting shaft, and the reel is rotated to feed the wire. In the rebar binding machine for twisting the wire and binding the rebar after winding the wire in a loop around the rebar,
  The light receiving means facing the reel side surface is installed on the binding machine main body side so that ambient light does not enter, and the light receiving means reflects the light emitted from the light emitting means on the reel side surface to receive the light receiving means. Is provided,
  A cover member that covers the light receiving means is provided on the reel mounting shaft,
  The cover member has an opening that allows the detected means to face the light receiving means,
  A portion for detecting light by the light receiving means is provided on at least one of the detected means and the cover member.
[0010]
  The reel of claim 2 is a reel used in the reinforcing bar binding machine of claim 1,With respect to the amount of light received by the light receiving means by reflecting the light emitted from the light emitting means during the rotation of the reel, one of the detected means and the cover member is a portion that makes light detection by the light receiving means effective. The other of the detected means and the cover member is a part that makes light detection by the light receiving means invalid or a small amount of received light.
[0012]
  Claim3The reel of claim 1Used for rebar binding machineA reel,
  The amount of light received by the light receiving means when the light receiving means receives the reflected light after the light emitted from the light emitting means is reflected by the detected means or the cover member when the reel rotates. Either one of the detected means and the cover member makes the light detection by the light receiving means effective, and the other one of the detected means and the cover member makes the light detection by the light receiving means invalid or a small amount of light received. And a distance from the detected means to the light receiving means and a distance from the cover member to the light receiving means are different.
[0013]
  Claim4The method for detecting the rotation of the reel includes: irradiating light from a light emitting unit to a rotation region of a detected unit provided so as to be detectable from an opening of a cover member that covers the side surface of the reel; The light is reflected by the member, and the reflected light is received by the light receiving means. The amount of the reflected light of the detected means received by the light receiving means and the reflected light of the cover member received by the light receiving means The rotation of the reel is detected based on the difference from the amount of received light.
[0014]
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.
[0015]
  7 and 8 schematically illustrate the configuration of the reinforcing bar binding machine according to this embodiment. FIG. 7 shows a state in which the lid 40A of the cassette case 40 is closed.The figure8 shows a state in which the lid 40A of the cassette case 40 is opened.
[Configuration of rebar binding machine]
  As shown in FIGS. 7 and 8, the reinforcing bar binding machine 20 is formed with a pair of abutting plate portions 23 applied to the reinforcing bars 22 at the lower part of the front end portion of the binding machine main body 21 facing the reinforcing bars 22. Between them, a twisting hook portion (wire gripping portion) 25 is disposed.
[0016]
The twisting hook portion 25 includes a plurality of plates P1, P2, and P3 into which the wire 27 can be inserted. The plates P1, P2, and P3 are oriented in the vertical direction (standby) so that the wire 27 can be passed between them, and are arranged in parallel. The plates P1, P3 are close to the central plate P2.・ It can be separated. The wire 27 is passed between the plates P2 and P3. After surrounding the reinforcing bar 22, the wire 27 is passed between the plates P1 and P2. By rotating the motor 26, the twisting hook portion 25 first holds the tip end side of the wire 27 between the plates P1 and P2, and then holds the rear end portion side of the wire 27 between the plates P2 and P3. A transmission mechanism D1 is provided that enables the twisting hook portion 25 to be rotated after the rear end portion of the wire 27 is cut by the cutting mechanism 34.
[0017]
In the binding machine body 21, a wire passage 30 passing through the wire 27 is provided in a curved guide portion 31, and the wire passage 30 is a groove having an open arc inside the guide portion 31.
[0018]
The rebar binding operation will be described. When the micro switch 33a is turned on by the trigger 28, a wire feed motor (not shown) rotates and the wire feed gear 33 rotates. By the rotation of the wire feed gear 33, the wire 27 wound around the wire reel 41 accommodated in the cassette case 40 is fed through the wire passage 30 in the guide portion 31 to the twisting hook portion 25 by a predetermined amount. When one end of the wire 27 reaches the wire gripping portion 25, the wire 27 hits the upper end portion of the plate P1 of the twisting hook portion 25 and is stopped, and the tip end portion of the wire 27 is placed between the plates P1 and P2 of the twisting hook portion 25. It is designed to be gripped.
[0019]
Thereafter, the motor that drives the wire feed gear 33 is reversely rotated to bring the wire 27 into close contact with the reinforcing bar 22, and then the wire 27 is cut by the cutting device 34. At that time, the rear end portion of the wire 27 is also gripped between the plates P2 and P3 of the wire gripping portion 25, and both ends of the wire 27 are gripped between the plates P1, P2 and P3 of the wire gripping portion 25.
[0020]
After the wire 27 is wound around the reinforcing bar 22, the motor 26 is rotated. When the wire gripping portion 25 is rotated by the rotation of the motor 26, the wire 27 is twisted to complete the binding of the reinforcing bar 22. To do. Completion of bundling detects an increase in driving torque and stops the motor 26. The lid 40A of the cassette case 40 can be opened and closed via a hinge 40B.
[0021]
Reference numeral R1 is a rod that rotates the movable cutter C1 of the cutting device 34. The rod R1 is moved back and forth at a predetermined timing by a transmission mechanism D2 that is driven by receiving a driving force from the transmission mechanism D1, The movable cutter C1 rotates around the fixed cutter C2 to cut the wire 27.
[0022]
FIG. 9 shows another embodiment. After the wire 27 is wound a plurality of times and cut by the cutting device 34, the twisting hook portion 25 is advanced by the advance / retreat mechanism 29 as the motor 26 rotates, and the wire 27 is gripped. Later, the structure is twisted.
[0023]
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 the attachment shaft 36 is attached to the cassette case 40. The attachment shaft 36 may be detachably attached to the cassette case 40. 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.
[0024]
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. The cassette case is not removable and may be fixed.
[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 42 of the cassette case 40. A shaft 43 is projected.
[0025]
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.
[0026]
A sensor installation hole 44 is opened in the bottom 42B of the cassette case 40, and a reflective interrupter 45 is installed in the sensor installation hole 44 as a light receiving means. 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.
[0027]
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 abrasion 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.
[0028]
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.
[0029]
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 51 facing the lid 42B, and the lid 42B 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.
[0030]
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.
[0031]
As shown in FIGS. 1 and 2, a recess 53A is formed on the surface of the reel 41 facing the bottom 42 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.
[0032]
Further, a thick part 42C that supports the flange 50 on the bottom part side of the reel 41 is formed on the bottom part 42B of the cassette case 40, and a concave part is formed between the reel mounting shaft 43 and the thick part 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.
[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.
[0033]
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.
[0034]
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.
[0035]
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.
[0036]
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.
[0037]
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.
[0038]
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.
[0039]
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. However, instead of the through hole 53H, a dent or A plurality of small protrusions or small recesses formed of a conical shape, a hemispherical shape, a stepped portion, a groove, or the like may be formed, or rough surface treatment may be performed.
[Other configurations of cassette case]
10 and 11 show configurations of a cassette case 60 and a reel 61 of a reinforcing bar binding machine according to another embodiment. The cassette case 60 constitutes a part of the reinforcing bar binding machine 20.
[Cassette case]
The cassette case 60 has a cylindrical shape made of plastic having excellent resistance to wear and bending, such as polypropylene, and the mounting shaft 36 of the bearing portion 35 is inserted and fixed to the bottom 62 of the cassette case 60. A reel mounting shaft 63 is projected.
[0040]
One end of the cassette case 40 is opened to insert the reel 61, and the opening is closed with a lid 62A. The tip end portion of the reel mounting shaft 63 can be fitted into the cylindrical projection P at the center of the lid 62A.
[0041]
A sensor installation hole 64 is opened in the bottom 62 of the cassette case 60, and a reflective interrupter 65 is installed as a light receiving means inside the sensor installation hole 64. Reference numeral 65A denotes a terminal plate to which the interrupter 65 is attached. The terminal plate 65A has a ring-shaped opening larger than the reel attachment shaft 63 so that the attachment shaft 36 is inserted into the reel attachment shaft 63. . The terminal board 65A is positioned on the annular protrusion 62B, and is fixed to the bottom 62 of the cassette case 60 with a screw (not shown). A cable 65C connected to the control circuit is connected to the terminal board 65A so that power is supplied to the interrupter 65 and an output signal of the interrupter 65 is transmitted to the control circuit.
[0042]
The control circuit detects the rotation of the reel 61 based on the output signal from the interrupter 65. That is, the control circuit determines that the reel 61 is not rotating when fluctuation in the output voltage from the interrupter 65 is not detected within a predetermined time even though electric power for rotating the motor 32 is supplied. Then, the operator informs the operator that the wire 27 of the reel 61 has been terminated by causing an LED or the like provided on the side surface of the reinforcing bar binding machine 1 to emit light or making a warning sound.
[cover]
An opaque cover 66A that covers the top of the interrupter 45 is rotatably attached to the base of the reel attachment shaft 63. A ring 67A and a stepped portion 67B that regulate the height of the cover 66A are attached to the outer periphery of the base portion of the reel mounting shaft 63. An annular protrusion 68 is formed inside the bottom 62 of the case 60, and an annular protrusion 69 is formed on the surface of the cover 66A on the bottom 62 side. The protrusions 68 and 69 are in contact with each other so as to be slidable and rotatable, thereby preventing disturbance light from entering the space S in which the interrupter 65 is disposed. The cover 66A is formed of a black plastic as with the reel 61. As shown in FIGS. 10 and 11, a pair of circular openings 70 having the same diameter as that of the interrupter 65 are formed at positions passing over the interrupter 65 of the cover 66 </ b> A.
[reel]
The reel 61 is made of a plastic having excellent resistance to wear and bending, such as polypropylene, and is made of black plastic so that ambient light does not enter the space S as much as possible. A wire 27 is wound around the reel 61, and the wire 27 can move forward or backward of the binding machine body 21 as the gear 33 rotates. The reel 61 can be rotated forward and backward in response to the wire 27 being fed and unwound.
[0043]
The reel 61 includes a hub 61 </ b> A around which the wire 27 is wound and the reel mounting shaft 43 is inserted, and a pair of flanges 71 that regulate the positional deviation of the wire 27 in the left-right direction. The hub 61A includes an inner cylindrical portion 72 into which the reel mounting shaft 43 is inserted and an outer cylindrical portion 61A around which the wire 27 is wound, similarly to the reel 50 in FIGS. The inner cylinder part 72 and the outer cylinder part 61A are connected by a rib 73, and a cylindrical protrusion 74A is formed on the rib 73 as a detected means. A fitting recess 75 is formed at the end of the inner cylindrical portion 72 facing the protrusion P, and the lid 62B is fitted into the fitting recess 75. A reel mounting shaft 63 is inserted into the inner cylinder portion 72.
[0044]
The flange 71 is thinned as much as possible to reduce cost and weight. One flange 71 is provided with an attachment groove (not shown) for fixing the end of the wire 27 on the winding start side.
[0045]
A concave portion 76 is formed on the surface of the reel 61 that faces the bottom portion 62 of the cassette case 60 to reduce the rotational resistance of the flange 71. The inner edge and the outer edge of the recess 76 are in contact with the cover 66 </ b> A, so that disturbance light does not enter the space S through the gap of the opening 70 as much as possible. A part of the flange 71 is in sliding contact with the cover 66A so that ambient light does not enter the space S, but in order to ensure that no gap is formed when the reel 61 rotates, the projection 74A that reflects the light of the interrupter 65 is provided. The cylindrical shape is fitted into the opening 70.
[0046]
The protrusion 74A is formed close to the interrupter 65 in the case of FIG. 10, and is separated from the interrupter 65 in the structure of FIG. The protrusion 74A of FIG. 10 is brought close to the interrupter 65, and the cover 66A is separated from the interrupter 65. As a result, the amount of light received by the protrusion 74A is lower than the amount of light received by the cover 66A around the protrusion 74A.
[0047]
That is, in this embodiment, a cover 66A (cover member) that covers the light receiving element of the interrupter 65 can be attached to and detached from the flange 71 that is the side surface of the reel, and the flange 71 reflects the light receiving element (light receiving means) of the interrupter 65. A protrusion 74A, which is a detected means that reflects light, is formed. On the other hand, the cover 66A has an opening 70 that allows the protrusion 74A to face the interrupter 65. The cover 66A may not be detachable.
[0048]
Regarding the amount of light received by the projection 74A so that the light emitted from the light emitting element of the interrupter 65 is received by the light receiving element of the interrupter 65 when the reel 61 rotates, either the projection 74A (detected means) or the cover 66A (cover member) One of the projections 74A and the cover 66A is a part that makes light detection by the light receiving element invalid or has a small amount of received light.
[0049]
In order to make the light detection by the light receiving element effective for either one of the protrusion 74A or the cover 66A, and to make the light detection invalid or small so that the other cannot detect the light by the light receiving element, the protrusion 74A (covered) The distance from the detection means) to the light receiving element is different from the distance from the cover 66A to the light receiving element.
[0050]
The general operation of the reflective interrupter will be described with reference to FIGS. 12 (a) to 12 (f) and FIGS. 11 (a) and 11 (b). FIGS. 12A to 12F show changes in the amount of reflected light reaching the light receiving element (phototransistor) Pt due to the difference in distance d between the reflective interrupter Int and the reflective material (aluminum) Ref. Indicates. As shown in FIGS. 12A to 12F, the amount of light received by the light receiving element Pt of the interrupter Int is the optical axis of the light emitted from the light emitting element (photodiode) Pd of the interrupter Int, the direction of the reflecting material, Further, it varies depending on the distance d between the interrupter Int and the reflecting material Ref. As shown in FIG. 12 (f), a region A1 in which the light emission intensity of the light emitted from the light emitting element Pd is equal to or greater than a predetermined value is defined as a light emission relative intensity of 100%. Distributed in front of the optical axis.
[0051]
As shown in FIG. 12A, when the distance d between the interrupter Int and the reflector Ref is short, the amount of reflected light received by the light receiving element Pt of the interrupter Int is significantly reduced, and the output of the interrupter Int is as shown in FIG. As shown in a), the light receiving element does not enter the region A2 having a light emission relative intensity of 75%, and the amount of received light is extremely low.
[0052]
As shown in FIGS. 12B to 12D, when the light receiving element Pt is turned on at a light emission relative intensity of 75%, and the light receiving element Pt of the interrupter Int is included in the region A2 having a light emission relative intensity of 75%, The light receiving element Pt of the interrupter Int is turned on.
[0053]
Furthermore, if the reflecting material Ref is too far from the interrupter Int as shown in FIG. 12E, the light receiving element Pt is located outside the region A2 having a light emission relative intensity of 75%, so that the amount of received light is insufficient, and the interrupter Int It will not turn on.
[0054]
13A and 13B are tables showing the relationship between the separation distance d from the light receiving element Pt of the reflective interrupter to the reflecting material Ref and the relative ratio of the output current output when the light receiving element Pt receives light. It is. As shown in this table, when the separation distance d between the interrupter Int and the reflector Ref is in the range of 1.5 mm to 4.5 mm, the collector current generated by the light receiving element Pt is 80% of the collector current with the maximum received light amount. % Or more.
[0055]
To explain in accordance with the present embodiment, when the protrusion 74A is positioned below the interrupter 65, the distance between the protrusion 74A and the interrupter 65 is too close, so the output voltage of the interrupter 65 is off or at the L level. When the projection 74A passes under the interrupter 65 and the cover 66A receives the light of the interrupter 65, the distance between the cover 66A and the interrupter 65 is appropriate, so that the amount of reflected light of the cover 66B detected by the interrupter 65 is appropriate. Therefore, the output of the interrupter 65 is turned on or becomes H level.
[0056]
On the other hand, the apex portion of the protrusion 74B in FIG. 11 is moved away from the interrupter 65 so that the interrupter 65 can output an appropriate output voltage, and the cover 66B receives the reflected light of the emitted light from the interrupter 65 as a light receiving element of the interrupter 65. Is provided close to the interrupter 65 so as not to sufficiently reach. Thus, the amount of light received by the apex portion of the protrusion 74B that reflects the light emitted from the interrupter 65 is larger than the amount of light received by the cover 66B around the protrusion 74B.
[0057]
Therefore, when the protrusion 74B is located at a position facing the interrupter 65, the amount of light received by the interrupter 65 is large, so that the output by the light detection of the interrupter 65 is on or H level. When the cover 66B is positioned below the light emitting element of the interrupter 65, the cover 66B is too close to the interrupter 65, so that the interrupter 65 has a received light amount of reflected light of the cover 66B equal to 0 or lower than the threshold value. The output of the interrupter 65 is turned off or at L level.
[0058]
In the case 60 and the reel 61 of FIG. 11, since the cover 66B is thick, a groove 68A for inserting the protrusion 68 is formed in the cover 66B, and the bottom 62 of the case 60 is formed in FIG. The stepped portion 67B shown is not formed. 10 and 11, the case 60 is provided with a lid 62A that can be opened and closed by a shaft 60B.
[0059]
As described above, the case 60 and the reel 61 shown in FIGS. 10 and 11 have different amounts of light received by the projections 74A and 74B and the covers 66A and 66B, so that the light strikes the covers 66A and 66B. When the light hits the projections 74A and 74B, the output signal of the interrupter 65 changes, and a substantially periodic rising or falling pulse can be obtained. For this reason, the rotation and the number of rotations of the reel 61 can be detected, and the presence or absence of a wire can be detected. With such a configuration, it is not necessary to change the colors of the reel and the covers 66A and 66B.
[0060]
Here, the rotation speed of the reel and the feed amount of the wire correspond to the thickness of the wire and can be expressed in a table or a calculation formula. A bar code reader that displays the barcode and the amount of winding is displayed, and a bar code reader that reads the barcode of the microcomputer and the reel is provided in the reinforcing bar binding machine. While the thickness is memorized, when the reel is attached to the reinforcing bar binding machine, the barcode on the reel is read with a barcode reader, the amount of wire used on the previous reel is reset, and the microcomputer is used according to the wire usage. To calculate the remaining wire amount from the wire thickness, reel diameter, and reel rotation speed, and use it on the LCD of a reinforcing bar binding machine. You can view the ear of remaining amount and the state, it can also be output by voice.
[0061]
In the above-described embodiment, the covers 66A and 66B are provided. However, if the space 65 between the interrupter 65 and the protrusions 64A and 64B is shielded from disturbance light, the covers 66A and 66B It is not always necessary. In this case, in order to prevent disturbance light from entering in the space S, the protrusion amount of the protrusion 68 of the bottom portion 62 of the case 60 is increased, outside the rotation locus of the protrusions 64A and 64B of the flange 71 and on the protrusion 68. It is conceivable to form a concentric wall portion concentrically with the flange 71 on the inner side or the outer side, and to configure the concentric wall portion and the projection 68 to be slidably rotatable. According to such a configuration, the light shielding property of the space S can be ensured.
[0062]
【The invention's effect】
According to the reinforcing bar binding machine of claim 1 and the reel of claim 2 of the present application, when the reel is mounted, the detected means for receiving the amount of reflected light different from the cover is applied to the part facing the light receiving means of the reel. Therefore, the rotation of the reel can be detected by the light receiving means by the light receiving means. 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. 1, and (2) is a cross-sectional view of a modified example 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 a side view showing a state in which a cover of a cassette case of the reinforcing bar binding machine is opened.
FIG. 9 is a side view of a reinforcing bar binding machine according to another embodiment of the present invention.
FIG. 10 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 third embodiment of the present invention.
FIG. 11 is a sectional view showing a state where a reel is mounted on a cassette case of a reinforcing bar binding machine according to a fourth embodiment of the present invention.
FIGS. 12A to 12F are explanatory views showing fluctuations in the amount of received light due to the difference in the separation distance between the reflective interrupter and the reflective material.
13A is a table showing the relationship between the distance between the interrupter and the reflecting material and the output current, and FIG. 13B is an explanatory diagram showing the arrangement state of the interrupter and the reflecting material.
FIG. 14 is a side view of a conventional reinforcing bar binding machine.
[Explanation of symbols]
20 Rebar tying machine
22 Rebar
27 wires
38 reels
40 cassette case
41 reel
43 Reel mounting shaft
45 Interrupter (light receiving means)
46 Cover
47 opening
53 Protrusion

Claims (4)

A reel mounting shaft is formed in the binding machine body, a reel on which a wire for binding reinforcing bars is wound is mounted on the reel mounting shaft, and the wire is looped around the reinforcing bar while feeding the wire by rotating the reel. In the rebar binding machine that twists the wire and binds the rebar after winding,
The light receiving means facing the reel side surface is installed on the binding machine main body side so that ambient light does not enter, and the light receiving means reflects the light emitted from the light emitting means on the reel side surface to receive the light receiving means. Is provided,
A cover member that covers the light receiving means is provided on the reel mounting shaft,
The cover member has an opening that allows the detected means to face the light receiving means,
A reinforcing bar binding machine, wherein a portion for detecting light by the light receiving means is provided on at least one of the detected means and the cover member. The reel used in the reinforcing bar binding machine according to claim 1 , wherein the detected light and the cover member are related to the amount of light received by the light receiving means by reflecting the light emitted from the light emitting means when the reel rotates. One of them is a part that enables light detection by the light receiving means, and either one of the detected means and the cover member is a part that makes light detection by the light receiving means invalid or has a small amount of received light. A reel characterized by being. A reel used in the reinforcing bar binding machine according to claim 1,
The amount of light received by the light receiving means when the light receiving means receives the reflected light after the light emitted from the light emitting means is reflected by the detected means or the cover member when the reel rotates. Either one of the detected means and the cover member makes the light detection by the light receiving means effective, and the other one of the detected means and the cover member makes the light detection by the light receiving means invalid or a small amount of light received. And a distance from the detected means to the light receiving means and a distance from the cover member to the light receiving means are different. Light is emitted from the light emitting means to the rotation area of the detected means provided so as to be detectable from the opening of the cover member covering the reel side face on the reel side surface, and the light is reflected by the detected means and the cover member. Based on the difference between the amount of reflected light of the detected means received by the light receiving means and the amount of reflected light of the cover member received by the light receiving means. A method for detecting the rotation of a reel, comprising detecting the rotation of the reel.

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