JP5182212B2 - Rebar binding machine - Google Patents

Description

  The present invention relates to a reinforcing bar binding machine that receives a binding wire fed downward with a curl hook and easily discharges foreign matter dropped on a lower curl guide that guides it upward again.

  In the conventional reinforcing bar binding machine, as shown in Patent Documents 1 and 2, curl guides for curling a wire with a curl are arranged vertically. The lower curl guide is provided so as to be openable and closable. When the lower curl guide is opened and closed, the wire after binding is easily pulled out from the binding machine body. The opening and closing structure also has a function as a safety device.When the lower curl guide is open, it is said that there is a finger or a tool for maintenance or something is caught in an abnormal state. Judgment does not work. In order to send an opening / closing signal of the lower curl guide to the binding machine body, an opening connecting the inside and the outside of the binding machine body is required. The sensor for detecting the lower curl guide is disposed inside the binding machine body to avoid the influence of dust, impact, and disturbance, and mechanically transmits a signal from the outside of the binding machine body to the inside. Therefore, a relatively large opening is formed in the signal transmission part of the binding machine body.

Japanese Patent No. 3496463 Japanese Patent No. 3050517

  However, in the conventional reinforcing bar binding machine, when the lower curl guide is closed, the opening is also closed by the curl guide cover, so that foreign matter such as a small piece of wire does not easily enter the binding machine body. When the thread is cut or the wire reel is finished, the cut piece of wire may fall into the lower curl guide. When the lower curl guide is opened, an opening is created between the lower curl guide and the curl guide cover. May get inside the machine. Also, the space between the lower curl guide and the curl guide cover is not completely closed, and a small gap is formed. When the broken wire is removed, the cut wire piece may slide down on the lower curl guide and enter the binding machine main body through the gap.

  As described above, when the wire piece enters the main body, there is a possibility that problems such as being caught in the movable part, entering into the motor, locking the motor, or deviating detection of the magnetic sensor may occur. Will lead to malfunction of the rebar binding machine.

  The present invention solves the above problems and provides a reinforcing bar binding machine equipped with a mechanism capable of reliably preventing foreign matter such as a small piece of wire mixed in on the lower curl guide from entering the binding machine body. That is the issue.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a curling guide that feeds a binding wire sent from a wire reel and winds it downward, and receives the wire and guides it to an upper curling guide again. A lower curl guide that protrudes from the front end of the binding machine body, and a base portion of the lower curl guide is provided in an opening formed in the lower part of the binding machine body so as to be pivotable downward via a support shaft. In the reinforcing bar binding machine, a cover portion that always closes a gap between the base portion of the lower curl guide and the upper surface portion of the opening is formed between the lower curl guide and the upper surface of the opening. Features.

  According to a second aspect of the present invention, in the first aspect, the cover portion is formed in a circular arc shape having a cross section centered on the support shaft.

  The invention according to claim 3 is characterized in that, in claim 1, the cover portion is formed in a bellows shape instead of an arc shape centering on the support shaft.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the cover portion is formed integrally with or separately from the lower curl guide.

  According to the first aspect of the present invention, the base portion of the lower curl guide is provided in an opening formed in the lower portion of the binding machine main body so as to be pivotable downward via the support shaft, and the lower curl guide. A cover portion that always closes the gap between the base portion of the lower curl guide and the upper surface portion of the opening is formed between the upper surface of the opening and the upper portion of the opening. Regardless of whether or not the foreign matter such as a small piece of wire mixed into the lower curl guide can be reliably prevented from entering the binding machine body.

  According to the second aspect of the present invention, since the cross section of the cover portion is formed in an arc shape centered on the support shaft, the cover portion is continuously formed in the lower curl when the lower curl guide is rotated. A gap between the base of the guide and the upper surface of the opening can always be closed.

  According to the invention of claim 3, since the cover portion is formed in a bellows shape, the clearance between the base portion of the lower curl guide and the upper surface portion of the opening portion increases as the lower curl guide rotates. Even if it becomes smaller or smaller, the gap can always be closed accordingly.

  According to the invention of claim 4, since the cover part is formed integrally with or separately from the lower curl guide, the cover part and the lower part can be formed when the cover part cannot be formed integrally due to molding problems or material differences. What is necessary is just to make a curl guide separate, and if it can be shape | molded integrally, you may shape | mold integrally, or you may integrally form another thing by welding etc.

The perspective view which shows the reinforcing bar binding machine which concerns on this invention with an internal mechanism (A) (b) is sectional drawing of the standby state and operation state of the lower curl guide of the said reinforcing bar binding machine Peripheral perspective view of the lower curl guide Perspective view of the curl guide Exploded perspective view of the curl guide (A) (b) is sectional drawing which shows the standby state of the cover part of other embodiment, and an operation state Sectional drawing which shows the standby state of the cover part of other embodiment Sectional drawing which shows the operating state of the cover part of the said embodiment

  In FIG. 1, reference numeral 1 denotes a reinforcing bar binding machine. In the reinforcing bar binding machine 1, a wire reel (not shown) around which a reinforcing bar binding wire 4 is wound is mounted in a storage chamber 3 provided in the binding machine body 2, and the wire 4 is bound while rotating the wire reel. It is sent to a curl guide 5 provided at the tip of the machine body 2, and the wire 4 is wound around the wire 4 by the curl guide 5 and sent around the reinforcing bar 6, wound around the wire bar 4, and then the original side of the wire 4 is cut. At the same time, the wound portion is twisted to bind the reinforcing bars 6 together.

  The binding machine body 2 is provided with a guide tube 7 through which the wire 4 drawn from the wire reel is passed. One end of the guide tube 7 opens into the storage chamber 3, and the other end opens at the base of a curl guide 5 described later. A pair of feed gears (not shown) are disposed in the middle of the guide tube 7 as a feed means for the wire 4. The wire 4 is sandwiched between feed gears and is sent out by its rotation.

  When the switch is turned on by the trigger 8, the electric motor rotates and the wire feed gear rotates. Then, by the rotation of the wire feed gear, the wire 4 wound around the wire reel stored in the storage chamber is sent to the front of the binding machine body 2 through the guide tube 7.

  At the front end of the binding machine body 2, the curl guide 5 that feeds the wire 4 that has been sent from the wire reel and wound downward, and the wire 4 that has been sent by the curl guide 5 is again connected to the upper curl guide 5. A lower curl guide 10 is provided so as to protrude so as to return to a predetermined position. The tip of the curl guide 5 is curved in an arc shape, and is wound around the reinforcing bar 6 in a loop around the reinforcing bar 6 by attaching a curling hook here.

  The curl guide 5 is provided with wire cutting means (not shown). The wire cutting means is configured to cut the wire when the feed amount of the wire 4 reaches a predetermined amount.

  Inside the binding machine main body 2, a wire twisting device 11 having a twisting hook 12 at the tip is disposed.

  The wire twisting device 11 moves the sleeve 13 pivotally attached to the hook 12 so that the hook 12 can be opened and closed by the electric motor 9 to close and operate the hook 12 so that the wire 4 wound around the rebar 6 is wound in a loop. After gripping, the hook 12 is rotated together with the sleeve 13 to twist the wire 4 to bind the rebar 6, and then the hook 12 is reversely rotated and the sleeve 13 is moved backward to be detached from the wire 4 to return to the initial position. It is what I did. The wire 4 is twisted after the wire 4 is cut along with the forward movement of the sleeve 13.

  The rotation of the feed gear, the cutting of the wire 4, the operation of the wire twisting device 11 and the like are sequence-controlled by a control circuit (not shown). The control circuit also measures the feed amount of the wire 4 based on the rotation amount of the feed gear.

  By the way, as shown in detail in FIGS. 2 (a) and 2 (b) and FIG. 3, the lower curl guide 10 is formed in an opening 14 formed in the lower portion of the work binding machine body so as to facilitate work such as maintenance. It is provided so as to be pivotable downward via a support shaft 15.

  The opening 14 is formed at the center of the front wall 17 constituting the lower part of the binding machine body, and the upper surface 16 is formed at the concave surface 18 having a circular cross section and at the rear of the concave surface 18. And a concave portion 20 having a triangular groove shape. The lower part of the opening 14 is formed by a standing wall 21 that constitutes the lower part of the front wall 17.

  As shown in FIGS. 4 and 5, a guide groove 22 is formed in the front part of the lower curl guide 10 so that the front end is wide, and a plate-like part 23 is formed in the rear part. . In the plate-like portion 23, guide members 24 are formed on both sides of the base portion of the guide groove 22 so as to guide the wire 4 so as not to be scattered left and right, and standing edges 25 are formed on both sides of the plate-like portion 23. The tip of the standing edge 25 is integrated with the guide member 24, the base 25a of the standing edge 25 is formed in an arc shape, and a bearing hole 26 is formed at the center thereof. A contact piece 33 is formed to extend behind one of the standing edges 25.

  A cover portion 27 is disposed on the upper portion of the base portion of the lower curl guide 10. The cover portion 27 includes a cover main body 28 having an arcuate cross section, a lower wall piece 30 that is suspended from the lower front end of the cover main body 28, and side pieces 31 that are bent rearward from both side ends of the lower wall piece 30. Has been. A spring receiving groove 29 is formed at the rear end of the cover body 28, and a bearing hole 32 is formed in the side piece 31. The center of the arc of the cover body 28 is formed to be the center of the bearing hole 32.

  The cover portion 27 is disposed on the plate-like portion 23 of the lower curl guide 10 together with the torsion coil spring 34, and is connected by the support shaft 15 inserted through both the bearing holes 26 and 32. Further, the side piece 31 and the contact piece 33 are in contact with the plate-like portion 23. Therefore, as shown in FIGS. 2A and 2B, the cover portion 27 always rotates integrally with the lower curl guide 10.

  By the way, the support shaft 15 is rotatably supported by bearings (not shown) provided on both inner sides of the opening 14 of the binding machine body, and one end 34a of the torsion coil spring 34 is a spring receiving groove 29 of the cover 27. Projecting from the upper surface 16 of the opening 14 and engaging with the recess 20. The other end 34 b is engaged on the plate-like portion 23. As a result, the lower curl guide 10 is urged so that the tip end side is rotated upward. For example, the rear end surface of the plate-like portion 23 hits the lower portion of the opening portion 14, so that it stops at that position and twists. The lower curl guide 10 can be rotated downward against the spring force of the coil spring 34.

  According to the above configuration, the cover portion 27 always closes the gap between the base portion of the lower curl guide 10 and the upper surface portion 16 of the opening portion 14. When the lower curl guide 10 is rotated downward for some reason, the cover portion 27 is also rotated simultaneously as shown in FIG. Since the cross section of the cover main body 28 is formed in an arc shape, the state where the gap between the upper surface portion 16 and the opening portion 14 is closed continues. Therefore, the gap is always closed before and after the rotation of the lower curl guide 10, so that it is ensured that the foreign matter 35 such as a small piece of wire that has fallen into the lower curl guide 10 enters the inside of the binding machine body. Can be prevented.

  In addition, the cover part 27 should just be the structure which always blocks | closes the said clearance gap before and after rotation of the lower curl guide 10. FIG. Therefore, it is not limited to the above-mentioned form. For example, as shown in FIGS. 6A and 6B, the cover portion 27 may be configured in a bellows shape.

  Also in this case, when the lower curl guide 10 is rotated downward, the cover portion 27 expands and contracts. Therefore, even if the gap between the plate-like portion 23 at the base of the lower curl guide 10 and the upper surface portion 16 of the opening 14 becomes larger or smaller as the lower curl guide 10 rotates, it corresponds to that. The gap can always be closed.

  Further, as shown in FIGS. 7 and 8, the cover body 28 of the cover portion 27 is made of an elastic material, the front half thereof is a curved portion 28a having an arc-shaped cross section, and the latter half is a corrugated wave having flexibility. You may make it comprise as the part 28b. In this case as well, even if the gap between the plate-like portion 23 at the base portion of the lower curl guide 10 and the upper surface portion 16 of the opening portion 14 becomes larger or smaller as the lower curl guide 10 rotates, it can cope with that. Thus, the gap can always be closed.

  Further, the cover portion does not need to be formed separately from the lower curl guide as in the above-described embodiment. If possible, both may be formed integrally, or both may be formed separately by welding or the like.

2 Bundling machine body 5 Curl guide 10 Lower curl guide 33 Abutting piece 14 Opening portion 15 Support shaft 16 Upper surface portion 27 Cover portion

Claims (4)

A curl guide that winds the binding wire sent from the wire reel and feeds it downward, and a lower curl guide that receives the wire and guides it to the upper curl guide again protrudes from the front end of the binding machine body In addition, the base part of the lower curl guide is a reinforcing bar binding machine provided in an opening formed in the lower part of the binding machine body so as to be rotatable downward via a support shaft.
A reinforcing bar binding machine characterized in that a cover portion is formed between the lower curl guide and the upper surface of the opening so as to always close a gap between the base of the lower curl guide and the upper surface of the opening.   2. The reinforcing bar binding machine according to claim 1, wherein the cover part is formed in an arc shape whose cross section is centered on the support shaft. 3.   The reinforcing bar binding machine according to claim 2, wherein the cover portion is formed in a bellows shape instead of an arc shape centering on the support shaft.   The reinforcing bar binding machine according to any one of claims 1 to 3, wherein the cover part is formed integrally with or separately from the lower curl guide.

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