Bundling machine

Abstract

A bundling machine includes a housing, a wire feeding unit that feeds a wire housed in the housing, a curling guide that receives the wire and winds the wire in a coil shape around a bundle, and a bundling unit that holds and twists the wound wire. The curling guide includes a first guide unit that receives the wire fed by the wire feeding unit and a second guide unit that receives the wire from the first guide unit. The bundling unit includes a holding unit that holds the wire fed by the wire feeding unit and guided by the second guide unit, the wire feeding unit pulling back the wire after the wire is held. The second guide unit includes a third guide unit that restricts movement of the wire in a radial direction of the coil, guides the wire from the first guide unit to the bundling unit, and a fourth guide unit that is movable relative to the third guide unit to be movable toward and away from the first guide unit, restricts movement of the wire in an axial direction of the coil, and suppresses displacement of the wire guided by the holding unit in the radial direction.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on July 21, 2016, entitled "Binding Machine" and with application number 201680042867.0. Technical Field

[0002] This invention relates to a bundling machine for bundling objects such as reinforcing bars with wire. Background Technology

[0003] In related technologies, a binding machine called a rebar binding machine has been proposed, which wraps wire around two or more rebars and twists the wrapped wire to bind the two or more rebars.

[0004] According to related technologies, rebar tying machines have a configuration in which wire is fed and wound around a rebar, and then twisted and tied (see, for example, Patent Document 1). To reduce the amount of wire used in such rebar tying machines, a rebar tying machine has been proposed in which the wire is fed in the forward direction and wound around a rebar, and then the wire is fed (pulled back) in the reverse direction and wound around the rebar in close contact with it (see, for example, Patent Document 2).

[0005] Even in any bundling machine, because the feed path is required to wrap around the wire and reinforcing bar, a pair of guides are set along the feed path of the wire.

[0006] Reference List

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 5182212

[0009] Patent Document 2: Japanese Patent No. 4747454 Summary of the Invention

[0010] Technical issues

[0011] In related technologies, the pair of guides constituting the feed path for winding wire around the bundle are fixed to the body of the strapping machine, thereby limiting the radial expansion of the wire loops wound around the bundle. However, when each guide is fixed, the strapping operation is completed, and during the operation of pulling the bundle out of the strapping machine's guides, the bundle gets stuck on the guides, resulting in deterioration of operability.

[0012] On the other hand, a technique has been proposed in which one of the pair of guides can rotate during the operation of pulling the guides of the strapping machine out of the bundle, so that the bundle is not jammed by the guide. However, because the entire guide moves in the radial direction of the loop of the wire formed into a loop, the radial expansion of the looped wire cannot be sufficiently suppressed.

[0013] The present invention has been made to solve this problem, and the object of the present invention is to provide a strapping machine that includes a guide capable of suppressing radial expansion of the loops of wire formed into loops and having excellent operability.

[0014] Solution to the problem

[0015] To address the aforementioned problems, the present invention provides a strapping machine comprising: a feeding unit having a guiding unit capable of winding wire around the bundled object; and a strapping unit that twists the wire wound by the feeding unit, wherein the guiding unit comprises: a first guiding unit that coils the wire fed by the feeding unit; and a second guiding unit that guides the wire fed from the first guiding unit, and the second guiding unit includes a third guiding unit and a fourth guiding unit, the third guiding unit limiting the position of the loop formed by the wire wound by the feeding unit in the radial direction, and the fourth guiding unit limiting the position of the loop formed by the wire wound by the feeding unit in the axial direction.

[0016] According to the present invention, in the operation of winding wire around a bundle, the wire fed from the first guide unit can be bundled by the bundling unit in such a way that the wire is guided to the third guide unit while the radial position of the loop of the wire is restricted by the fourth guide unit of the second guide unit and the radial position of the loop of the wire is restricted by the third guide unit.

[0017] Beneficial effects of the invention

[0018] According to the present invention, a third guide unit for adjusting the radial position of the wire coil is fixed or movable, thereby suppressing radial expansion of the wire coil. Furthermore, a fourth guide unit for adjusting the radial position of the wire coil is movable, thereby improving operability during the operation of pulling the bundled material from the strapping machine. Attached Figure Description

[0019] Figure 1 This is a side view of an example of the overall structure of the rebar tying machine in this embodiment.

[0020] Figure 2This is a front view showing an example of the overall structure of the rebar tying machine of this embodiment when viewed from the front.

[0021] Figure 3 This is a view showing an example of a feed gear according to this embodiment.

[0022] Figure 4A This is a view showing an example of a side-by-side guide in this embodiment.

[0023] Figure 4B This is a view showing an example of a side-by-side guide in this embodiment.

[0024] Figure 4C This is a view showing an example of a side-by-side guide in this embodiment.

[0025] Figure 4D This is a view showing an example of parallel cables.

[0026] Figure 4E This is a view showing an instance of crossed, twisted wires.

[0027] Figure 5 This is a view showing an example of the guide trench in this embodiment.

[0028] Figure 6 This is a view showing an example of the second guiding unit in this embodiment.

[0029] Figure 7A This is a view showing an example of the second guiding unit in this embodiment.

[0030] Figure 7B This is a view showing an example of the second guiding unit in this embodiment.

[0031] Figure 8A This is a view showing an example of the second guiding unit in this embodiment.

[0032] Figure 8B This is a view showing an example of the second guiding unit in this embodiment.

[0033] Figure 9A This is a view showing the main parts of the gripping unit according to this embodiment.

[0034] Figure 9B This is a view showing the main parts of the gripping unit according to this embodiment.

[0035] Figure 10 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0036] Figure 11This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0037] Figure 12 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0038] Figure 13 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0039] Figure 14 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0040] Figure 15 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0041] Figure 16 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0042] Figure 17 This is an explanatory diagram of the operation of the rebar tying machine in this embodiment.

[0043] Figure 18A This is an explanatory diagram illustrating the process of winding wire around reinforcing bars.

[0044] Figure 18B This is an explanatory diagram illustrating the process of winding wire around reinforcing bars.

[0045] Figure 18C This is an explanatory diagram illustrating the process of winding wire around reinforcing bars.

[0046] Figure 19A This is an explanatory diagram illustrating the operation of forming loops using wire by a curling guide unit.

[0047] Figure 19B This is an explanatory diagram for the operation of forming loops with wire using a curling guide unit.

[0048] Figure 20A This is an instructional diagram for bending wire.

[0049] Figure 20B This is an instructional diagram for bending wire.

[0050] Figure 20C This is an instructional diagram for bending wire.

[0051] Figure 21A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0052] Figure 21B This is an example of the operational effect of the rebar tying machine in this embodiment.

[0053] Figure 22A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0054] Figure 22B This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0055] Figure 23A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0056] Figure 23B This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0057] Figure 24A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0058] Figure 24B This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0059] Figure 25A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0060] Figure 25B This is an example of the operational effect of the rebar tying machine in this embodiment.

[0061] Figure 25C This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0062] Figure 25D This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0063] Figure 26A This is an example of the operational effect of the rebar tying machine in this embodiment.

[0064] Figure 26B This is an example of the operation and problems of a rebar tying machine based on relevant technologies.

[0065] Figure 27A This is a view showing a variant example of the second guiding unit in this embodiment.

[0066] Figure 27B This is a view showing a variant example of the second guiding unit in this embodiment.

[0067] Figure 28A This is a view showing a variant of the side-by-side guides in this embodiment.

[0068] Figure 28B This is a view showing a variant of the side-by-side guides in this embodiment.

[0069] Figure 28C This is a view showing a variant of the side-by-side guides in this embodiment.

[0070] Figure 28DThis is a view showing a variant of the side-by-side guides in this embodiment.

[0071] Figure 28E This is a view showing a variant of the side-by-side guides in this embodiment.

[0072] Figure 29 This is a view showing a variant example of the guide trench in this embodiment.

[0073] Figure 30A This is a view showing a variant example of the wire feeding unit according to this embodiment.

[0074] Figure 30B This is a view showing a variant example of the wire feeding unit according to this embodiment.

[0075] Figure 31 This is a view showing an example of a second guide unit according to another embodiment.

[0076] Figure 32 This is an illustrative diagram showing an example of the operation of a second guiding unit according to another embodiment.

[0077] Figure 33 This is an illustrative diagram showing an example of the operation of a second guiding unit according to another embodiment.

[0078] Figure 34 This is an illustrative diagram showing an example of the operation of a second guiding unit according to another embodiment.

[0079] Figure 35 This is an illustrative diagram showing an example of the operation of a second guiding unit according to another embodiment. Detailed Implementation

[0080] In the following description, an example of a rebar tying machine, which is an embodiment of the tying machine of the present invention, will be described with reference to the accompanying drawings.

[0081] <Example of the construction of the rebar tying machine in the embodiment>

[0082] Figure 1 This is a side view of an example of the overall structure of the rebar tying machine according to this embodiment, and Figure 2 This is a front view showing an example of the overall structure of the rebar tying machine of this embodiment. Figure 2 schematically shown Figure 1 The internal structure of line AA in the diagram.

[0083] The rebar tying machine 1A of this embodiment uses two or more wires W with a smaller diameter than conventional wires with a large diameter to tie the rebar S, which is the object to be tied. In the rebar tying machine 1A, as will be described later, the rebar S is tied with the wires W by winding the wires W around the rebar S, by winding the wires W around the rebar S in close contact with the rebar S, and by twisting the wires W around the rebar S. In the rebar tying machine 1A, because the wires W are bent in any of the above operations, by using wires W with a smaller diameter than conventional wires, the wires are wound around the rebar S with less force, and the wires W can be twisted with less force. Furthermore, by using two or more wires, the binding strength of the wires W to the rebar S can be ensured. Moreover, by arranging two or more wires W to be fed side-by-side, the time required to wind the wires W can be shortened compared to winding the rebar two or more times with a single wire. It should also be noted that the wire W wound around the reinforcing bar S and the wire W wound in close contact with the reinforcing bar S are collectively referred to as wound wire W. Wire W can be wound on a binding material other than the reinforcing bar S. Here, as wire W, a single wire or a twisted wire made of a metal capable of plastic deformation is used.

[0084] The rebar tying machine 1A includes: a material box 2A, which is a receiving unit for holding wire W; a wire feeding unit 3A, which feeds the wire W contained in the material box 2A; and a parallel guide 4A for arranging the wire W fed to and from the wire feeding unit 3A in parallel. The rebar tying machine 1A further includes: a coiling guide unit 5A, which winds the wire W fed in parallel around the rebar S; and a cutting unit 6A, which cuts the wire W wound around the rebar S. Additionally, the rebar tying machine 1A includes a binding unit 7A, which holds and twists the wire W wound around the rebar S.

[0085] Material box 2A is an example of a receiving unit. In this embodiment, a spool 20 with two long wires W wound in a retractable manner is detachably received in the material box. The spool 20 has: a tubular hub 20a capable of winding the wires W; and a pair of flanges 20b disposed at two opposite ends in the axial direction of the hub 20a. The flanges 20b have a larger diameter than the hub 20a and protrude beyond the two opposite ends in the axial direction of the hub 20a. Two or more wires W (in this example, two wires W) are wound around the hub 20a. In the rebar binding machine 1A, the two wires W are fed from the spool 20 while the spool 20 received in the material box 2A rotates, by feeding the two wires W through the wire feeding unit 3A and by manually feeding the two wires W. At this time, the two wires W are wound around the hub 20a, so that the two wires W are fed in without being twisted.

[0086] The wire feeding unit 3A is an example of a wire feeding unit constituting a feeding unit, and includes a first feed gear 30L and a second feed gear 30R as a pair of feeding components for feeding parallel wires W. The first feed gear 30L is in the form of a spur gear that feeds the wire W by rotational operation, and the second feed gear 30R also has a spur gear shape for clamping the wire W with the first feed gear 30L. Although details of the first feed gear 30L and the second feed gear 30R will be described later, the first feed gear 30L and the second feed gear 30R have a spur gear shape in which teeth are formed on the outer peripheral surface of the disc-shaped component. However, the first feed gear 30L and the second feed gear 30R mesh with each other, and the driving force is transmitted from one feed gear to the other, so that the two wires W can be properly fed without being limited to the spur gear shape.

[0087] The first feed gear 30L and the second feed gear 30R are each formed of a disc-shaped component. In the wire feeding unit 3A, the first feed gear 30L and the second feed gear 30R are configured to clamp the feed path of the wire W, such that the outer peripheral surfaces of the first feed gear 30L and the second feed gear 30R face each other. The first feed gear 30L and the second feed gear 30R clamp the two parallel wires W between the portions of the first feed gear 30L and the second feed gear 30R that face each other. With the two wires W arranged side by side, the first feed gear 30L and the second feed gear 30R feed the two wires W along the extension direction of the wires W.

[0088] Figure 3 This is a view illustrating an example of the feed gear in this embodiment. Here, Figure 3 It is along Figure 2The first feed gear 30L includes teeth 31L on its outer peripheral surface. The second feed gear 30R includes teeth 31R on its outer peripheral surface.

[0089] The first feed gear 30L and the second feed gear 30R are arranged side by side, so that the teeth 31L and 31R face each other. In other words, the first feed gear 30L and the second feed gear 30R are arranged side by side in the axial direction Ru1 of the loop Ru formed by the wire W wound by the coiling guide unit 5A (i.e., along the axial direction of the virtual circle of the loop Ru formed by the wire W being considered as a circle). In the following description, the axial direction Ru1 of the loop Ru formed by the wire W wound by the coiling guide unit 5A is also referred to as the axial direction Ru1 of the loop of the wire W.

[0090] The first feed gear 30L includes a first feed groove 32L on its outer peripheral surface. The second feed gear 30R includes a second feed groove 32R on its outer peripheral surface. The first feed gear 30L and the second feed gear 30R are arranged such that the first feed groove 32L and the second feed groove 32R face each other, and the first feed groove 32L and the second feed groove 32R form a clamping portion.

[0091] A first feed groove 32L is formed in a V-groove shape on the outer peripheral surface of the first feed gear 30L along the rotation direction of the first feed gear 30L. The first feed groove 32L has a first inclined surface 32La and a second inclined surface 32Lb, which form a V-shaped groove. The first feed groove 32L has a V-shaped cross-section, so that the first inclined surface 32La and the second inclined surface 32Lb face each other at a predetermined angle. When the wires W are held side by side between the first feed gear 30L and the second feed gear 30R, the first feed groove 32L is configured such that one of the outermost wires of the side-by-side wires W (in this example, a portion of the outer peripheral surface of one of the two side-by-side wires W1) contacts the first inclined surface 32La and the second inclined surface 32Lb.

[0092] A second feed groove 32R is formed in a V-groove shape on the outer peripheral surface of the second feed gear 30R along the rotation direction of the second feed gear 30R. The second feed groove 32R has a first inclined surface 32Ra and a second inclined surface 32Rb, which form a V-shaped groove. Similar to the first feed groove 32L, the second feed groove 32R has a V-shaped cross-sectional shape, and the first inclined surface 32Ra and the second inclined surface 32Rb face each other at a predetermined angle. When the wires W are held side by side between the first feed gear 30L and the second feed gear 30R, the second feed groove 32R is configured such that another wire among the outermost wires of the side-by-side wires W (in this example, a portion of the outer peripheral surface of another wire W2 of the two side-by-side wires W) contacts the first inclined surface 32Ra and the second inclined surface 32Rb.

[0093] When wire W is clamped between the first feed gear 30L and the second feed gear 30R, the first feed groove 32L is configured with a depth and an angle (between the first inclined surface 32La and the second inclined surface 32Lb) such that a portion of a wire W1 that is in contact with the first inclined surface 32La and the second inclined surface 32Lb protrudes from the root circle 31La of the first feed gear 30L on the side facing the second feed gear 30R.

[0094] When wire W is clamped between the first feed gear 30L and the second feed gear 30R, the second feed groove 32R is configured with a depth and an angle (between the first inclined surface 32Ra and the second inclined surface 32Rb) such that a portion of another wire W2, which is in contact with the first inclined surface 32Ra and the second inclined surface 32Rb, protrudes from the root circle 31Ra of the second feed gear 30R on the side facing the first feed gear 30L.

[0095] As a result, the two wires W clamped between the first feed gear 30L and the second feed gear 30R are arranged such that: one wire W1 is pressed against the first inclined surface 32La and the second inclined surface 32Lb of the first feed groove 32L, and the other wire W2 is pressed against the first inclined surface 32Ra and the second inclined surface 32Rb of the second feed groove 32R. Then, one wire W1 and the other wire W2 are pressed against each other. Therefore, by the rotation of the first feed gear 30L and the second feed gear 30R, the two wires W (one wire W1 and the other wire W2) are simultaneously fed between the first feed gear 30L and the second feed gear 30R while in contact with each other. In this example, the first feed groove 32L and the second feed groove 32R have a V-shaped cross-section, but it is not necessarily limited to a V-groove shape, and it can be, for example, a trapezoidal shape or an arc shape. In addition, in order to transmit the rotation of the first feed gear 30L to the second feed gear 30R, a transmission mechanism can be provided between the first feed gear 30L and the second feed gear 30R. The transmission mechanism includes an even number of gears for rotating the first feed gear 30L and the second feed gear 30R in opposite directions.

[0096] The wire feeding unit 3A includes: a drive unit 33 for driving a first feed gear 30L; and a shifting unit 34 for pressing a second feed gear 30R against the first feed gear 30L and separating it from the first feed gear 30L.

[0097] The drive unit 33 includes: a feed motor 33a for driving a first feed gear 30L; and a transmission mechanism 33b for transmitting the driving force of the feed motor 33a to the first feed gear 30L, the transmission mechanism 33b including a combination of gears, etc.

[0098] In the first feed gear 30L, the rotational operation of the feed motor 33a is transmitted via the transmission mechanism 33b, and the first feed gear rotates. In the second feed gear 30R, the rotational operation of the first feed gear 30L is transmitted to the toothed portion 31R via the toothed portion 31L, and the second feed gear rotates along with the first feed gear 30L.

[0099] As a result, through the rotation of the first feed gear 30L and the second feed gear 30R, the two wires W are fed in a state where they are arranged side by side due to the frictional force generated between the first feed gear 30L and the wire W1, the frictional force generated between the second feed gear 30R and the other wire W2, and the frictional force generated between the wire W1 and the other wire W2.

[0100] By switching the forward and reverse rotation directions of the feed motor 33a, the wire feed unit 3A switches the rotation directions of the first feed gear 30L and the second feed gear 30R, and the forward and reverse feed directions of the wire W are switched.

[0101] In the rebar tying machine 1A, the wire W is fed in the forward direction (i.e., in the direction of the coiling guide unit 5A) by the forward rotation of the first feed gear 30L and the second feed gear 30R in the wire feeding unit 3A, and is wound around the rebar S at the coiling guide unit 5A. Furthermore, after the wire W is wound around the rebar S, the first feed gear 30L and the second feed gear 30R are rotated in the reverse direction, thereby feeding (pulling back) the wire W in the reverse direction (i.e., in the direction of the material box 2A) as indicated by arrow X2. The wire W is wound around the rebar S and then pulled back, thereby forming a tight contact between the wire W and the rebar S.

[0102] The shifting unit 34 includes a first shifting member 35 that shifts the second feed gear 30R in a direction that forms close contact and separation between the second feed gear 30R and the first feed gear 30L during rotational operation with shaft 34a as a fulcrum, and a second shifting member 36 that shifts the first shifting member 35. The second feed gear 30R is compressed in the direction of the first feed gear 30L by a spring (not shown) that biases the second shifting member 36. Therefore, in this example, the two wires W are held between the first feed groove 32L of the first feed gear 30L and the second feed groove 32R of the second feed gear 30R. Furthermore, the teeth 31L of the first feed gear 30L and the teeth 31R of the second feed gear 30R mesh with each other. Here, the relationship between the first shifting member 35 and the second shifting member 36 is such that by shifting the second shifting member 36 to allow the first shifting member 35 to enter a free state, the second feed gear 30R can be separated from the first feed gear 30L. However, the first shifting component 35 and the second shifting component 36 can be interlocked with each other.

[0103] Figure 4A , Figure 4B and Figure 4C This is a view illustrating an example of side-by-side guides according to this embodiment. Here, Figure 4A , Figure 4B and Figure 4C It is along Figure 2 The cross-sectional view is taken along line CC, showing the cross-sectional shape of the parallel guide 4A positioned at the introduction position P1. Furthermore, the cross-sectional shape of the parallel guide 4A positioned at the intermediate position P2 is shown along... Figure 2 The sectional view taken by line DD and the cross-sectional shape of the parallel guide 4A set at the cut-out position P3 are shown along the line. Figure 2 The cross-sectional view taken by line EE shows the same shape. Furthermore, Figure 4D This is a view showing an example of parallel cables, and Figure 4E This is a view showing an instance of twisted wires that intersect each other.

[0104] The parallel guide 4A is an example of a limiting unit constituting a feed unit, and it limits the direction of multiple (two or more) wires W that have been fed. Two or more wires W enter, and the parallel guide 4A feeds the two or more wires W side by side. In the parallel guide 4A, the two or more wires are arranged side by side in a direction orthogonal to the feed direction of the wires W. Specifically, the two or more wires W are arranged side by side along the axial direction of the coiled wire W wound around the reinforcing bar S by the coiling guide unit 5A. The parallel guide 4A has a wire limiting unit (e.g., an opening 4AW described later) that limits the direction and relative movement of the two or more wires W and causes them to be side by side. In this example, the parallel guide 4A has a guide body 4AG, and the guide body 4AG is formed with an opening 4AW, which is a wire limiting unit for passing (inserting) the multiple wires W through. An opening 4AW extends through the guide body 4AG along the feed direction of the wires W. When and after the multiple wires W being fed through the opening 4AW, their shape is determined such that the multiple wires W are arranged side-by-side (i.e., each wire W is aligned in a direction orthogonal to the feed direction (axial direction) of the wires W, and the axes of each wire W are substantially parallel to each other). Therefore, the multiple wires W that have passed through the parallel guide 4A exit from the parallel guide 4A in a side-by-side arrangement. In this way, the parallel guide 4A restricts the direction and orientation of the alignment of the two wires W in the radial direction, thus arranging the two wires W side-by-side. Therefore, in the opening 4AW, one direction orthogonal to the feed direction of the wires W is longer than another direction orthogonal to both the feed direction of the wires W and the first direction. The opening 4AW has a longitudinal direction (two or more wires W can be placed side by side in this longitudinal direction) that is orthogonal to the feed direction of the wire W (more specifically, along the axial direction of the wire W coiled by the coiling guide unit 5A). As a result, two or more wires W inserted through the opening 4AW are fed parallel to the feed direction of the wire W, and the axis of one wire is offset from the axis of the other wire in a direction parallel to the axial direction Ru1 of the coil of the wire W.

[0105] In the following description, when describing the shape of the opening 4AW, the cross-sectional shape in the direction orthogonal to the feed direction of the wire W will be described. The cross-sectional shape in the direction along the feed direction of the wire W will be described in each case.

[0106] For example, when the opening 4AW (its cross-section) is a circle with a diameter equal to or greater than twice the diameter of the wire W, or an approximately square with one side length twice or greater than the diameter of the wire W, the two wires W through the opening 4AW are in a state where they can move freely in the radial direction.

[0107] If the two wires W through the opening 4AW can move freely in the radial direction within the opening 4AW, then the direction in which the two wires W are arranged in the radial direction cannot be restricted. Thus, the two wires W emanating from the opening 4AW do not have to be parallel; they can be twisted or crossed.

[0108] Therefore, the opening 4AW is formed such that: its length in one direction (i.e., the length L1 in the longitudinal direction) is set to be slightly (n) times the diameter r of the wires W arranged in a radial direction, and its length in the other direction (i.e., the length L2 in the transverse direction) is set to be slightly (n) times the diameter r of a single wire W. In this example, the opening 4AW has: a length L1 in the longitudinal direction that is slightly twice the diameter r of the wires W; and a length L2 in the transverse direction that is slightly twice the diameter r of a single wire W. In this embodiment, the parallel guide 4A is configured such that the longitudinal direction of the opening 4AW is straight and the transverse direction is arcuate, but this configuration is not limited to.

[0109] exist Figure 4A In the example shown, the length L2 of the parallel guide 4A in the transverse direction is set to be a length slightly longer than the diameter r of a wire W, which is preferred. However, because the longitudinal direction of the parallel guide 4A is oriented along the axial direction Ru1 of the loop of the wire W wound around the reinforcing bar S at the coiled guide unit 5A, it is sufficient for the wire W to come out from the opening 4AW in a parallel state without crossing or twisting, so the length L2 of the parallel guide 4A in the transverse direction is as shown in the example. Figure 4B The length shown can range from slightly longer than the diameter r of one wire W to slightly shorter than the diameter r of two wires W.

[0110] Furthermore, in a construction where the longitudinal direction of the parallel guide 4A is oriented orthogonally to the axial direction Ru1 of the loop of wire W wound around the reinforcing bar S in the coiled guide unit 5A, as in Figure 4CAs shown, the length L2 of the parallel guide 4A in the lateral direction can be in the range of slightly longer than the diameter r of one wire W to slightly shorter than the diameter r of two wires W.

[0111] In the parallel guide 4A, the longitudinal direction of the opening 4AW is oriented along a direction orthogonal to the feed direction of the wire W (in this example, along the axial direction Ru1 of the loop of the wire W wound around the reinforcing bar S in the coiling guide unit 5A).

[0112] As a result, the parallel guide 4A enables two wires to pass side by side along the axial direction Ru1 of the loop formed by wire W.

[0113] In the parallel guide 4A, when the length L2 of the opening 4AW in the lateral direction is shorter than twice the diameter r of the wire W and slightly longer than the diameter r of the wire W, the wire W can still pass through side by side even if the length L1 of the opening 4AW in the longitudinal direction is sufficiently long to be twice or more the diameter r of the wire W.

[0114] However, the longer the length L2 in the transverse direction (e.g., close to twice the diameter r of the wire W) and the longer the length L1 in the longitudinal direction, the more freely the wire W can move within the opening 4AW. Then, the corresponding axes of the two wires W no longer become parallel within the opening 4AW, and there is a high probability that the wires W will be twisted or cross each other after passing through the opening 4AW.

[0115] Therefore, it is preferable that the longitudinal length L1 of the opening 4AW is slightly longer than twice the diameter r of the wire W, and the transverse length L2 is also slightly longer than the diameter r of the wire W, such that the two wires W are arranged side by side in the feed direction and adjacent to each other in the transverse or radial direction.

[0116] Parallel guides 4A are disposed at predetermined positions on the upstream and downstream sides of the first feed gear 30L and the second feed gear 30R (wire feed unit 3A) in relation to the feed direction for feeding wire W in the positive direction. By providing parallel guides 4A on the upstream side of the first feed gear 30L and the second feed gear 30R, the two wires W in a parallel state enter the wire feed unit 3A. Therefore, the wire feed unit 3A can properly (parallelly) feed the wires W. Furthermore, by also providing parallel guides 4A on the downstream side of the first feed gear 30L and the second feed gear 30R, while maintaining the parallel state of the two wires W sent from the wire feed unit 3A, the wires W can be further sent to the downstream side.

[0117] The parallel guide 4A, located on the upstream side of the first feed gear 30L and the second feed gear 30R, is positioned at the inlet position P1 between the first feed gear 30L and the second feed gear 30R and the material box 2A, so that the wire W fed to the wire feeding unit 3A is arranged in parallel in a predetermined direction.

[0118] A parallel guide 4A, located on the downstream side of the first feed gear 30L and the second feed gear 30R, is positioned at an intermediate position P2 between the first feed gear 30L and the second feed gear 30R and the cutting unit 6A, such that the wire W fed to the cutting unit 6A is arranged in parallel in the predetermined direction.

[0119] Furthermore, another parallel guide 4A, located on the downstream side of the first feed gear 30L and the second feed gear 30R, is provided at the cutting discharge position P3 of the cutting unit 6A, such that the wire W fed to the coiling guide unit 5A is arranged in parallel in the predetermined direction.

[0120] The parallel guide 4A, located at the introduction position P1, has the aforementioned shape in which at least the downstream side of the opening 4AW restricts the radial direction of the wire W in the feed direction of the wire W being sent in the forward direction. On the other hand, the opening area on the upstream side of the opening 4AW, facing the hopper 2A (wire introduction unit) in the feed direction of the wire W being sent in the forward direction, has a larger opening area than the downstream side. Specifically, the opening 4AW has: a tubular orifice that restricts the direction of the wire W; and a conical (funnel-shaped, tapering) orifice in which the opening area gradually increases from the upstream end of the tubular orifice to the entrance of the opening 4AW, which serves as the wire introduction section. By maximizing the opening area of ​​the wire introduction section and gradually decreasing the opening area thereafter, the wire W is easily allowed to enter the parallel guide 4. Therefore, the operation of introducing the wire W into the opening 4AW can be easily performed.

[0121] Another parallel guide 4A also has the same construction, and the downstream opening 4AW, in relation to the feed direction of the wire W sent in the positive direction, has the aforementioned shape that restricts the direction of the wire W in the radial direction. Furthermore, regarding the other parallel guide 4, the opening area of ​​the opening on the upstream side in relation to the feed direction of the wire W sent in the positive direction can be made larger than the opening area of ​​the opening on the downstream side.

[0122] The parallel guide 4A located at the inlet position P1, the parallel guide 4A located at the intermediate position P2, and the parallel guide 4A located at the cut-out position P3 are arranged such that the longitudinal direction of the opening 4AW, which is orthogonal to the feed direction of the wire W, is in the direction along the axial direction Ru1 of the loop of the wire W wound around the reinforcing bar S.

[0123] As a result, such as in Figure 4D As shown, the two wires W fed by the first feed gear 30L and the second feed gear 30R are fed while maintaining a side-by-side arrangement in the axial direction Ru1 of the loops of wire W wound around the reinforcing bar S, and as in Figure 4E As shown, this is to prevent the two wires W from crossing and twisting during feeding.

[0124] In this example, the opening 4AW is a tubular hole with a predetermined depth (a predetermined distance or depth from the inlet to the outlet of the opening 4AW) from its inlet to its outlet (in the feed direction of the wire W), but the shape of the opening 4AW is not limited to this. For example, the opening 4AW can be a planar hole with almost no depth, and the plate-shaped guide body 4AG is opened with this planar hole. Furthermore, instead of a hole penetrating the guide body 4AG, the opening 4AW can be a groove-shaped guide (e.g., a U-shaped guide groove with an open upper portion). Furthermore, in this example, the opening area of ​​the inlet portion of the opening 4AW, which serves as the wire introduction portion, is larger than other portions, but it does not have to be larger than other portions. The shape of the opening 4AW is not limited to a specific shape, as long as the multiple wires that have passed through the opening 4AW and left the parallel guide 4A are in a parallel state.

[0125] This describes an example of placing the parallel guide 4A at predetermined positions (intermediate position P2 and cutting discharge position P3) on the upstream side (introduction position P1) and downstream side of the first feed gear 30L and the second feed gear 30R. However, the positions of the parallel guide 4A are not limited to these three positions. That is, the parallel guide 4A can be placed only in the introduction position P1, only in the intermediate position P2, or only in the cutting discharge position P3, and only in the introduction position P1 and the intermediate position P2, only in the introduction position P1 and the cutting discharge position P3, or only in the intermediate position P2 and the cutting discharge position P3. Furthermore, four or more parallel guides 4A can be placed at any position between the coiling guide unit 5A on the downstream side of the introduction position P1 and the cutting position P3. The introduction position P1 also includes the interior of the material box 2A. That is, the parallel guide 4A can be arranged inside the material box 2A near the outlet where the wire W is pulled out.

[0126] The coiling guide unit 5A is an example of a guide unit constituting a feeding unit, and the coiling guide unit 5A forms a conveying path for winding the two wires W in a loop shape around the reinforcing bar S. The coiling guide unit 5A includes: a first guide unit 50 for coiling the wires W fed by the first feed gear 30L and the second feed gear 30R; and a second guide unit 51 for guiding the wires W fed from the first guide unit 50 to the binding unit 7A.

[0127] The first guiding unit 50 includes: a guiding groove 52 forming a feed path for the wire W; and guide pins 53 and 53b serving as guiding components for winding the wire W in cooperation with the guiding groove 52. Figure 5 This is a view showing an example of the guide trench in this embodiment. Figure 5 It is along Figure 2 The cross-sectional view taken by line GG.

[0128] The guide groove 52 forms a guide unit, and together with the parallel guide 4A, the guide groove 52 is confined to a direction in the radial direction of the wire W that is orthogonal to the feed direction of the wire W. Therefore, in this example, the guide groove 52 is constructed with an opening having an elongated shape in which one direction orthogonal to the feed direction of the wire W is longer than another direction orthogonal to both the feed direction of the wire W and the first direction.

[0129] The guide groove 52 has a longitudinal length L1 (i.e., the length of the groove in the width direction) slightly longer than the multiple diameters r of the multiple wires W arranged in the radial direction, and a transverse length L2 in the transverse direction slightly longer than the diameter r of a single wire W. In this embodiment, the longitudinal length L1 of the guide groove 52 is slightly longer than the diameters r of two wires W. In the guide groove 52, the longitudinal direction of the opening is arranged in the direction along the axial direction Ru1 of the loop of wire W. It should be noted that the guide groove 52 does not necessarily need to have the function of restricting the direction of the wire W in the radial direction. In this case, the size (length) of the guide groove 52 in the longitudinal and transverse directions is not limited to the sizes described above.

[0130] A guide pin 53 is disposed on the inlet side of the wire W fed by the first feed gear 30L and the second feed gear 30R in the first guide unit 50, and the guide pin 53 is arranged in the radial direction inside the coil Ru formed by the wire W relative to the feed path of the wire W by the guide groove 52. The guide pin 53 restricts the feed path of the wire W, so that the wire W fed along the guide groove 52 does not enter the radial direction inside the coil Ru formed by the wire W.

[0131] The guide pin 53b is disposed on the discharge side of the wire W fed by the first feed gear 30L and the second feed gear 30R in the first guide unit 50, and the guide pin 53b is arranged by the guide groove 52 on the outer side of the loop Ru formed by the wire W in the radial direction relative to the feed path of the wire W.

[0132] In the wire W fed by the first feed gear 30L and the second feed gear 30R, the radial position of the loop Ru formed by the wire W is restricted at at least three points, including two points on the outer side of the loop Ru formed by the wire W in the radial direction and at least one point on the inner side between the two points, so that the wire W is coiled.

[0133] In this example, the radial outer position of the loop Ru formed by the wire W is restricted at two points: the parallel guide 4A, located at the cutting discharge position P3 upstream of the guide pin 53 in the feed direction of the wire W being sent in the positive direction, and the guide pin 53b, located downstream of the guide pin 53. Furthermore, the radial inner position of the loop Ru formed by the wire W is restricted by the guide pin 53.

[0134] The coiling guide unit 5A includes a retraction mechanism 53a, which allows the guide pin 53 to be retracted from the path through which the wire W moves by winding the wire W around the reinforcing bar S. After the wire W is wound around the reinforcing bar S, the retraction mechanism 53a is displaced in connection with the operation of the binding unit 7A, and before the timing of winding the wire W around the reinforcing bar S, the retraction mechanism 53a retracts the guide pin 53 from the path through which the wire W moves.

[0135] The second guide unit 51 includes: a fixed guide unit 54, which serves as a third guide unit, for limiting the radial position of the loop Ru formed by the wire W wound around the reinforcing bar S (movement of the wire W in the radial direction of the loop Ru); and a movable guide unit 55, which serves as a fourth guide unit, for limiting the position of the loop Ru formed by the wire W wound around the reinforcing bar S along the axial direction Ru1 (movement of the wire W in the axial direction Ru1 of the loop Ru).

[0136] Figure 6 , Figure 7A , Figure 7B , Figure 8A and Figure 8B This is a view showing an instance of the second guide unit. Figure 6 This is a plan view of the second guide unit 51 as seen from above. Figure 7A and Figure 7B This is a side view of the second guide unit 51 when viewed from one side, and Figure 8A and Figure 8B This is a side view of the second guide unit 51 when viewed from the other side.

[0137] The fixed guide unit 54 has a wall surface 54a that extends radially outward along the feed direction of the wire W on the outer side of the loop Ru formed by the wire W wound around the reinforcing bar S. When the wire W is wound around the reinforcing bar S, the wall surface 54a of the fixed guide unit 54 restricts the radial position of the loop Ru formed by the wire W wound around the reinforcing bar S. The fixed guide unit 54 is fixed to the main body 10A of the reinforcing bar binding machine 1A, and the position of the fixed guide unit 54 is fixed relative to the first guide unit 50. The fixed guide unit 54 can be integrally formed with the main body 10A. In addition, in the configuration where the fixed guide unit 54 is attached to the main body 10A as a separate component, the fixed guide unit 54 is not completely fixed to the main body 10A, but can be movable to a degree that can restrict the movement of the wire W during the operation of forming the loop Ru.

[0138] A movable guide unit 55 is disposed on the distal side of the second guide unit 51, and the movable guide unit 55 includes a wall surface 55a disposed on both sides of a loop Ru formed by the wire W wound around the reinforcing bar S in the axial direction Ru1, and the wall surface 55a is erected inward from the wall surface 54a in the radial direction of the loop Ru. When the wire W is wound around the reinforcing bar S, the movable guide unit 55 uses the wall surface 55a to limit the position of the loop Ru formed by the wire W wound around the reinforcing bar S in the axial direction Ru1. The wall surface 55a of the movable guide unit 55 has a tapered shape, in which the gap of the wall surface 55a expands at the distal side where the wire W sent from the first guide unit 50 enters, and narrows toward the fixed guide unit 54b. As a result, the position of the wire W sent from the first guide unit 50 in the axial direction Ru1 of the loop Ru formed by the wire W wound around the reinforcing bar S is restricted by the wall surface 55a of the movable guide unit 55, and is guided by the movable guide unit 55 to the fixed guide unit 54.

[0139] On the side opposite to the distal end into which the wire W fed from the first guide unit 50 enters, the movable guide unit 55 is supported on the fixed guide unit 54 by a shaft 55b. In the movable guide unit 55, the distal end of the movable guide unit 55 is opened and closed in the direction of contact and separation from the first guide unit 50 by the rotational operation of the loop Ru formed by the wire W wound around the reinforcing bar S along the axial direction Ru1 with the shaft 55b as the fulcrum, and the wire W fed from the first guide unit 50 enters the distal end of the movable guide unit 55.

[0140] In this rebar tying machine, when tying rebar S, the rebar is inserted (set) between a pair of guide members provided for winding wire W around the rebar S. In this example, between the first guide unit 50 and the second guide unit 51, the rebar is then tied. When the tying is completed, in order to perform subsequent tying work, the first guide unit 50 and the second guide unit 51 are pulled out from the rebar S after the tying is completed. When pulling out the first guide unit 50 and the second guide unit 51 from the rebar S, if the rebar tying machine 1A is positioned in the direction of arrow Z3 (see arrow Z3, which is a direction of separation from the rebar S)... Figure 1 Moving the rebar tying machine 1A in the direction of arrow Z3 allows for the easy and trouble-free pulling of the rebar S from the first guide unit 50 and the second guide unit 51. However, for example, when the rebar S is arranged at predetermined intervals along arrow Y2 and these rebar S are bundled sequentially, it is cumbersome to move the rebar tying machine 1A in the direction of arrow Z3 after each bundle, and if the rebar tying machine 1A can be moved in the direction of arrow Z2, the bundling work can be performed quickly. However, in conventional rebar tying machines, such as those disclosed in Japanese Patent No. 4747456, because the guide member corresponding to the second guide unit 51 in this example is fixed to the tying machine body, the guide member gets stuck on the rebar S when attempting to move the rebar tying machine in the direction of arrow Z2. Therefore, in the rebar tying machine 1A, by making the second guide unit 51 (movable guide unit 55) movable as described above and by moving the rebar tying machine 1A in the direction of arrow Z2, it is easier to pull the rebar S from between the first guide unit 50 and the second guide unit 51.

[0141] Therefore, the movable guide unit 55 rotates about the axis 55b, which serves as a fulcrum, and thus opens and closes between the guide position and the retraction position. In the guide position, the wire W sent from the first guide unit 50 can be guided to the second guide unit 51. In the retraction position, the rebar tie machine 1A is moved in the direction of arrow Z2, and then the rebar tie machine 1A is retracted during the operation of pulling the rebar S out of the rebar tie machine 1A.

[0142] The movable guide unit 55 is pushed in a direction by a pressing unit (biasing unit), such as a torsion spring 57, in order to reduce the distance between the distal ends of the first guide unit 50 and the second guide unit 51, and the force of the torsion spring 57 holds the movable guide unit 55 in place. Figure 7A and Figure 8A The guide position is shown in the diagram. Additionally, when the movable guide unit 55 is pushed towards the rebar S by pulling out the rebar tying machine 1A from the rebar S, the movable guide unit 55 is opened from the guide position to the position shown in the diagram. Figure 7B and 8BThe retraction position is shown in the diagram. The guide position is the position where the wall surface 55a of the movable guide unit 55 is located where the wire W forming the loop Ru passes through. The retraction position is the position where the rebar S is squeezed by the movement of the rebar tying machine 1A and can be pulled out between the first guide unit 50 and the second guide unit 51. Here, the direction in which the rebar tying machine 1A is moved is not uniform, and even if the movable guide unit 55 moves slightly from the guide position, the rebar S can still be pulled out between the first guide unit 50 and the second guide unit 51, and therefore the position where it moves slightly from the guide position is also included in the retraction position.

[0143] The rebar tying machine 1A includes a guide open / close sensor 56 for detecting the opening and closing of a movable guide unit 55. The guide open / close sensor 56 detects the closed and open states of the movable guide unit 55 and outputs a predetermined detection signal.

[0144] The cutting unit 6A includes: a fixed blade unit 60; a rotating blade unit 61 for cooperating with the fixed blade unit 60 to cut the wire W; and a transmission mechanism 62 that transmits the operation of the binding unit 7A (in this example, the operation of the movable member 83 moving in a linear direction, described later) to the rotating blade unit 61 and causes the rotating blade unit 61 to rotate. The fixed blade unit 60 is constructed by providing a cutting edge capable of cutting the wire W in the opening through which the wire W passes. In this example, the fixed blade unit 60 includes parallel guides 4A arranged at the cutting discharge position P3.

[0145] The rotating blade unit 61 cuts the wire W through the parallel guide 4A of the fixed blade unit 60 via a rotational operation with axis 61a as the fulcrum. The displacement transmission mechanism 62 is associated with the operation of the bundling unit 7A, and after the wire W is wound around the reinforcing bar S, the rotating blade unit 61 is rotated according to the timing of the twisting of the wire W to cut the wire W.

[0146] The binding unit 7A is an example of a binding unit, and the binding unit 7A includes: a holding unit 70 for holding the wire W; and a bending unit 71 configured to bend one end WS side and the other end WE side of the wire W held by the holding unit 70 toward the reinforcing bar S.

[0147] Holding unit 70 is an instance of a holding unit, and as in Figure 2The diagram shows a fixed gripping member 70C, a first movable gripping member 70L, and a second movable gripping member 70R. The first movable gripping member 70L and the second movable gripping member 70R are arranged in the transverse direction via the fixed gripping member 70C. Specifically, the first movable gripping member 70L is positioned on one side of the wire W to be wound along the axial direction relative to the fixed gripping member 70C, and the second movable gripping member 70R is positioned on the other side.

[0148] The first movable gripping member 70L is moved in a direction that forms contact with and separates from the fixed gripping member 70C. Additionally, the second movable gripping member 70R is moved in a direction that forms contact with and separates from the fixed gripping member 70C.

[0149] When the first movable gripping member 70L moves away from the fixed gripping member 70C, a feed path for the wire W is formed in the gripping unit 70 between the first movable gripping member 70L and the fixed gripping member 70C. On the other hand, as the first movable gripping member 70L moves toward the fixed gripping member 70C, the wire W is gripped between the first movable gripping member 70L and the fixed gripping member 70C.

[0150] When the second movable gripping member 70R moves away from the fixed gripping member 70C, a feed path for the wire W to pass between the second movable gripping member 70R and the fixed gripping member 70C is formed in the gripping unit 70. On the other hand, as the second movable gripping member 70R moves toward the fixed gripping member 70C, the wire W is gripped between the second movable gripping member 70R and the fixed gripping member 70C.

[0151] The wire W, fed by the first feed gear 30L and the second feed gear 30R and passing through the parallel guide 4A at the cutting discharge position P3, passes between the fixed gripping member 70C and the second movable gripping member 70R, and is guided to the coiling guide unit 5A. The wire W, already wound by the coiling guide unit 5A, passes between the fixed gripping member 70C and the first movable gripping member 70L.

[0152] Therefore, the first gripping unit for gripping one end WS side of the wire W is composed of a pair of gripping parts (e.g., a fixed gripping part 70C and a first movable gripping part 70L). In addition, the fixed gripping part 70C and the second movable gripping part 70R constitute a second gripping unit for gripping the other end WE side of the wire W cut by the cutting unit 6A.

[0153] Figure 9A and 9BThis is a view showing the main parts of the gripping unit in this embodiment. The first movable gripping member 70L includes a protrusion 70Lb projecting toward the fixed gripping member 70C on its surface facing the fixed gripping member 70C. Conversely, the fixed gripping member 70C includes a recess 73 on its surface facing the first movable gripping member 70L, into which the protrusion 70Lb of the first movable gripping member 70L is inserted. Accordingly, when the wire W is gripped with the first movable gripping member 70L and the fixed gripping member 70C, the wire W is bent toward the first movable gripping member 70L.

[0154] Specifically, the fixed grip member 70C includes a preliminary bend 72. The preliminary bend 72 is configured such that a protrusion protruding toward the first movable grip member 70L is provided on the surface of the fixed grip member 70C facing the first movable grip member 70L at the downstream end along the feed direction of the wire W being fed in the positive direction.

[0155] To grip the wire W between the fixed gripping member 70C and the first movable gripping member 70L and prevent the gripped wire W from being pulled out, the gripping unit 70 has a protrusion 72b and a recess 73 on the fixed gripping member 70C. The protrusion 72b is provided on the surface of the fixed gripping member 70C facing the first movable gripping member 70L, and is provided at the upstream end along the feed direction of the wire W fed in the positive direction, and the protrusion 72b protrudes towards the first movable gripping member 70L. The recess 73 is provided between the initial bend 72 and the protrusion 72b, and the recess 73 has a concave shape in the opposite direction to the first movable gripping member 70L.

[0156] The first movable gripping member 70L has: a recess 70La, into which the initial bending portion 72 of the fixed gripping member 70C enters; and a protrusion 70Lb, into which the protrusion 70Lb enters the recess 73 of the fixed gripping member 70C.

[0157] As a result, such as in Figure 9B As shown, by holding one end WS of the wire W between the fixed gripping member 70C and the first movable gripping member 70L, the wire W is squeezed by the initial bending portion 72 on the side of the first movable gripping member 70L, and one end WS of the wire W is bent in a direction away from the wire W held by the fixed gripping member 70C and the second movable gripping member 70R.

[0158] Holding wire W with a fixed gripping member 70C and a second movable gripping member 70R includes a state in which wire W can move freely to some extent between the fixed gripping member 70C and the second movable gripping member 70R. This is because, during the operation of winding wire W around the reinforcing bar S, it is necessary for wire W to move between the fixed gripping member 70C and the second movable gripping member 70R.

[0159] The bending portion 71 is an example of a bending unit that bends the wire W such that, after the wire W is bundled with a bundle, the end of the wire W is positioned closer to the bundle than the top of the wire W, which protrudes significantly in the direction away from the bundle, is closer to the bundle. The bending portion 71 bends the wire W held by the holding unit 70 before the wire W is twisted by the holding unit 70.

[0160] The bending portion 71 is an example of a bundling unit disposed around the holding unit 70 to cover a portion of the holding unit 70, and the bundling unit is configured to be movable along the axial direction of the holding unit 70. Specifically, the bending portion 71 is configured to approach the wire W held by the fixed holding member 70C and the first movable holding member 70L at one end WS side and the wire W held by the fixed holding member 70C and the second movable holding member 70R at the other end WE side, so as to be movable in a direction that bends the wire W at one end WS side and the other end WE side in a forward / backward direction away from the direction of the bent wire W.

[0161] The curved portion 71 is in the forward direction indicated by arrow F (see...) Figure 1 The wire W, held by the fixed gripping member 70C and the first movable gripping member 70L, moves upward, causing one end WS side of the wire W to be bent towards the reinforcing bar S side with the gripping position as the fulcrum. Furthermore, the bent portion 71 moves forward in the direction indicated by arrow F, thereby bending the other end WE side of the wire W between the fixed gripping member 70C and the second movable gripping member 70R towards the reinforcing bar S side with the gripping position as the fulcrum.

[0162] By moving the bending portion 71, the wire W is bent, thereby squeezing the wire W passing between the second movable gripping member 70R and the fixed gripping member 70C, and preventing the wire W from coming out between the fixed gripping member 70C and the second movable gripping member 70R.

[0163] The bundling unit 7A includes a length limiting unit 74 that limits the position of one end WS of the wire W. The length limiting unit 74 is constructed by placing a component in the feed path of the wire W, which already passes between the fixed gripping member 70C and the first movable gripping member 70L, with the one end WS of the wire W abutting against this component. To ensure a predetermined distance from the gripping position of the wire W by the fixed gripping member 70C and the first movable gripping member 70L, in this example, the length limiting unit 74 is disposed in the first guide unit 50 of the coiling guide unit 5A.

[0164] The rebar tying machine 1A includes a tying unit drive mechanism 8A that drives a tying unit 7A. The tying unit drive mechanism 8A includes: a motor 80; a rotating shaft 82 driven by the motor 80 via a reducer 81 that performs reduction and torque amplification; a movable part 83 that is displaced by the rotational operation of the rotating shaft 82; and a rotation limiting member 84 that limits the rotation of the movable part 83, which is interlocked with the rotational operation of the rotating shaft 82.

[0165] In the rotating shaft 82 and the movable part 83, the rotation operation of the rotating shaft 82 is converted into the movement of the movable part 83 along the rotating shaft 82 in the front-back direction by the screw part provided on the rotating shaft 82 and the nut part provided in the movable part 83.

[0166] The movable member 83 is locked to the rotation limiting member 84 in the operating area where the holding unit 70 holds the wire W, and then the wire W is bent by the bending part 71, so that the movable member 83 can move in the front-back direction while the rotation operation is limited by the rotation limiting member 84. In addition, by disengaging from the lock of the rotation limiting member 84, the movable member 83 can be rotated by the rotation operation of the rotation axis 82.

[0167] In this example, the movable part 83 is connected to the first movable gripping part 70L and the second movable gripping part 70R via cams (not shown). The strapping unit drive mechanism 8A is configured such that the movement of the movable part 83 in the front-rear direction is converted into: an operation of displacing the first movable gripping part 70L in a direction that forms contact and separation with the fixed gripping part 70C; and an operation of displacing the second movable gripping part 70R in a direction that forms contact and separation with the fixed gripping part 70C.

[0168] Furthermore, in the strapping unit drive mechanism 8A, the rotation operation of the movable part 83 is converted into the rotation operation of the fixed gripping part 70C, the first movable gripping part 70L, and the second movable gripping part 70R.

[0169] Furthermore, in the strapping unit drive mechanism 8A, the bending portion 71 is integrally provided with the movable member 83, so that the bending portion 71 moves in the front-back direction as the movable member 83 moves in the front-back direction.

[0170] The retraction mechanism 53a of the guide pin 53 is constructed by a linkage mechanism, which converts the movement of the movable part 83 in the front-to-back direction into the displacement of the guide pin 53. The transmission mechanism 62 of the rotating blade part 61 is constructed by a linkage mechanism, which converts the movement of the movable part 83 in the front-to-back direction into the rotation operation of the rotating blade part 61.

[0171] The rebar tying machine 1A according to this embodiment is designed for manual use by a worker and includes a main body 10A and a handle 11A. (As in...) Figure 1 As shown, the rebar tying machine 1A integrates a tying unit 7A and a tying unit drive mechanism 8A within the main body 10A, and the rebar tying machine 1A has a coiling guide unit 5A (not shown) at one end in the longitudinal direction (first direction Y1). Furthermore, the handle portion 11A is configured to protrude from the other end of the main body 10A in the longitudinal direction in a direction substantially orthogonal (intersecting) with the longitudinal direction (second direction Y2). Additionally, a wire feeding unit 3A is provided on one side along the second direction Y2 relative to the tying unit 7A, a shifting unit 34 is provided on the other side along the first direction Y1 relative to the wire feeding unit 3A (i.e., on the handle portion 11A in the main body 10A relative to the wire feeding unit 3A), and a material box 2A is provided on one side along the second direction Y2 relative to the wire feeding unit 3A.

[0172] Therefore, a material box 2A is provided on one side of the handle portion 11A along the first direction Y1. A trigger 12A is provided on the side of the handle portion 11A along the first direction Y1, and a control unit 14A controls the feed motor 33a and the motor 80 according to the state of the switch 13A pressed by the operation of the trigger 12A. In addition, a battery 15A is detachably attached to the end of the handle portion 11A along the second direction Y2.

[0173] <An example of the operation of the rebar tying machine in this embodiment>

[0174] Figures 10 to 17 This is a diagram used to explain the operation of the rebar tying machine 1A according to this embodiment, and Figure 18A , Figure 18B and Figure 18C This diagram is used to explain the process of winding wire around a reinforcing bar. Figure 19A and Figure 19B This is an explanatory diagram used to explain the operation of forming loops with wire by a curling guide unit, and Figure 20A , Figure 20B and Figure 20C This is an explanatory diagram of the operation of bending the wire. Next, referring to the accompanying drawings, the operation of binding the reinforcing bar S with wire W by the reinforcing bar binding machine 1A of this embodiment will be described.

[0175] Figure 10 This shows the origin state (i.e., the initial state before wire W has been sent by wire feed unit 3A). In this origin state, the end of wire W waits at the cut-out position P3. Figure 18A As shown, in this example, the wire W waiting at the cut-out position P3 passes through the parallel guide 4A (fixed blade part 60) that sets the two wires W at the cut-out position P3, and is arranged in a predetermined direction.

[0176] In the wire W between the cutting discharge position P3 and the material box 2A, the parallel guide 4A at the intermediate position P2 and the parallel guide 4A at the introduction position P1 are arranged side by side in a predetermined direction by the first feed gear 30L and the second feed gear 30R.

[0177] Figure 11 The diagram shows the state in which the wire W is wound around the reinforcing bar S. When the reinforcing bar S is inserted between the first guide unit 50 and the second guide unit 51 of the coiling guide unit 5A and the trigger 12A is activated, the feed motor 33a is driven in the normal rotation direction, and thus the first feed gear 30L rotates in the positive direction, and the second feed gear 30R rotates in the positive direction while following the first feed gear 30L.

[0178] Therefore, the frictional force generated between the first feed gear 30L and the wire W1, the frictional force generated between the second feed gear 30R and the other wire W2, and the frictional force generated between the wire W1 and the other wire W2 will feed the two wires W in the positive direction.

[0179] By providing parallel guides 4A on the upstream and downstream sides of the wire feeding unit 3A in terms of the feeding direction of the wire W being fed in the positive direction, two wires W entering between the first feed groove 32L of the first feed gear 30L and the second feed groove 32R of the second feed gear 30R, as well as two wires W exiting from the first feed gear 30L and the second feed gear 30R, are fed side by side in a predetermined direction.

[0180] When wire W is fed in the forward direction, it passes between the fixed gripping member 70C and the second movable gripping member 70R, and through the guide groove 52 of the first guide unit 50 of the coiling guide unit 5A. As a result, wire W is coiled and thus wound around the reinforcing bar S. The two wires W introduced into the first guide unit 50 are held in a side-by-side arrangement by the side-by-side guide member 4A at the cut discharge position P3. Furthermore, because the two wires W are fed while being pressed against the outer wall surface of the guide groove 52, the wires W passing through the guide groove 52 are also held in a side-by-side arrangement in a predetermined direction.

[0181] As in Figure 19A As shown, the wire W fed from the first guide unit 50 is restricted by the movable guide unit 55 of the second guide unit 51 to move along the axial direction Ru1 of the loop Ru formed by the wire to be wound, so as to be guided by the wall surface 55a to the fixed guide unit 54. Figure 19B In this process, the movement of the wire W along the radial direction of the loop Ru guided to the fixed guide unit 54 is limited by the wall surface 54a of the fixed guide unit 54, and the wire W is guided between the fixed gripping member 70C and the first movable gripping member 70L. Then, when the distal end of the wire W is fed to the position where it abuts against the length limiting unit 74, the drive of the feed motor 33a is stopped.

[0182] A small amount of wire W is fed in the positive direction until the distal end of wire W abuts against the length limiting unit 74, and then the feeding stops, thereby causing the wire W wound around the reinforcing bar S to... Figure 19B The solid line in the diagram indicates a displacement in the radial direction of the loop Ru, as shown by the double-dotted line. When the wire W wound around the reinforcing bar S is displaced in the radial direction of the loop Ru, one end WS of the wire W, guided by the gripping unit 70 between the fixed gripping member 70C and the first movable gripping member 70L, is displaced rearward. Therefore, as in Figure 19B As shown, the position of the wire W in the radial direction of the coil Ru is restricted by the wall surface 54a of the fixed guide unit 54, thereby suppressing the displacement of the wire W guided to the gripping unit 70 in the radial direction of the coil Ru and suppressing the occurrence of grip failure. In this embodiment, even when the end WS side of the wire W guided between the fixed gripping member 70C and the first movable gripping member 70L is not displaced and the wire W is displaced in the direction of radial extension of the coil Ru, the displacement of the wire W in the radial direction of the coil Ru is still suppressed by the fixed guide unit 54, thereby suppressing the occurrence of grip failure.

[0183] As a result, wire W is wound in a loop around reinforcing bar S. At this point, as in... Figure 18BAs shown, the two wires W wound around the reinforcing bar S are held in a state where they are arranged side by side without being twisted. When the output of the guide open / close sensor 56 detects that the movable guide unit 55 of the second guide unit 51 is open, the control unit 14A does not drive the feed motor 33a even when the trigger 12A is activated. Instead, notification is given by a notification unit (not shown) such as a light or buzzer. This prevents malfunctions in the guidance of the wires W.

[0184] Figure 12 The diagram shows the state in which the wire W is held by the holding unit 70. After the feeding of the wire W stops, the motor 80 is driven in the normal rotational direction, thereby causing the movable member 83 to move in the direction of the arrow F, which is the forward direction. That is, in the movable member 83, the rotational operation interlocked with the rotation of the motor 80 is restricted by the rotation limiting member 84, and the rotation of the motor 80 is converted into linear movement. As a result, the movable member 83 moves in the forward direction. In association with the operation of the movable member 83 moving in the forward direction, the first movable holding member 70L is displaced in a direction close to the fixed holding member 70C, and one end of the wire W, the WS side, is held.

[0185] Furthermore, the operation of the movable part 83 moving in the forward direction is transmitted to the retraction mechanism 53a, and the guide pin 53 is retracted from the path through which the wire W has moved.

[0186] Figure 13 The diagram shows the state in which wire W is wound around reinforcing bar S. After one end WS of wire W is held between a first movable gripping member 70L and a fixed gripping member 70C, and after the feed motor 33a is driven in the opposite rotation direction, the first feed gear 30L rotates in the opposite direction, and the second feed gear 30R rotates in the opposite direction along with the first feed gear 30L.

[0187] Therefore, the two wires W are pulled back towards the material box 2A and fed in the opposite (reverse) direction. During the reverse feeding of the wires W, the wires W are wound around the reinforcing bar S, thus making close contact with it. In this example, as in... Figure 18CAs shown, because the two wires are arranged side by side, the increase in feed resistance caused by the twisting of the wires W during the operation of feeding the wires W in opposite directions is suppressed. Furthermore, in order to obtain the same binding strength between binding the rebar S with a single wire as in the conventional case and binding the rebar S with two wires W as in this example, the use of two wires W allows for a smaller diameter for each wire W. Therefore, the wires W are easier to bend, and a tight contact can be formed between the wires W and the rebar S with a small force. Thus, the wires W can be reliably wound around the rebar S with a tight contact using a small force. Additionally, by using two thin wires W, it is easier to form the wires W into a loop shape, and the load when cutting the wires W can also be reduced. Along with this, each motor of the rebar binding machine 1A can be miniaturized, and the entire main body can be miniaturized by miniaturizing the mechanical parts. Furthermore, power consumption can be reduced by reducing the size of the motors and the load.

[0188] Figure 14 The diagram shows the state in which wire W is being cut. After the wire W is wound around the reinforcing bar S and the feeding of the wire W is stopped, the motor 80 is driven in the normal rotational direction, thereby moving the movable member 83 in the forward direction. In conjunction with the operation of the movable member 83 moving in the forward direction, the second movable gripping member 70R is moved in a direction close to the fixed gripping member 70C, and the wire W is gripped. In addition, the operation of the movable member 83 moving in the forward direction is transmitted to the cutting unit 6A by the transmission mechanism 62, and by the operation of the rotating blade section 61, the other end WE side of the wire W held by the second movable gripping member 70R and the fixed gripping member 70C is cut.

[0189] Figure 15 The diagram shows one end of the wire W bent toward the side of the reinforcing bar S. After cutting the wire W, the movable member 83 is moved further forward, and the bent portion 71 moves integrally with the movable member 83 in the forward direction.

[0190] Specifically, such as in Figure 20B and Figure 20C As shown, the bend 71 moves in a direction approaching the reinforcing bar S, which is the forward direction indicated by arrow F, such that the bend includes a bend 71a that forms contact with one end WS side of the wire W held by the fixed gripping member 70C and the first movable gripping member 70L. Furthermore, the bend 71 moves in a direction approaching the reinforcing bar S, which is the forward direction indicated by arrow F, such that the bend includes a bend 71b that forms contact with the other end WE side of the wire W held by the fixed gripping member 70C and the second movable gripping member 70R.

[0191] By moving the bending portion 71 a predetermined distance in the forward direction indicated by arrow F, one end WS side of the wire W held by the fixed gripping member 70C and the first movable gripping member 70L is squeezed towards the reinforcing bar S side by the bending portion 71a, and is bent towards the reinforcing bar S side with the gripping position as the fulcrum.

[0192] As in Figure 20A and Figure 20B As shown, the gripping unit 70 includes a slip-prevention portion 75 (the protrusion 70Lb can also serve as the slip-prevention portion 75) protruding toward the fixed gripping member 70C on the distal side of the first movable gripping member 70L. By moving the bending portion 71 in the forward direction indicated by arrow F, one end WS side of the wire W held by the fixed gripping member 70C and the first movable gripping member 70L is bent toward the reinforcing bar S side at the gripping position of the fixed gripping member 70C and the first movable gripping member 70L, with the slip-prevention portion 75 as a fulcrum. Figure 20B The second movable gripping component 70R is not shown.

[0193] Furthermore, by moving the bending portion 71 a predetermined distance in the forward direction indicated by arrow F, the other end WE side of the wire W held by the fixed gripping member 70C and the second movable gripping member 70R is squeezed towards the reinforcing bar S side by the bending portion 71b, and is bent towards the reinforcing bar S side with the gripping position as the fulcrum.

[0194] As in Figure 20A and Figure 20C As shown, the gripping unit 70 is provided with a slip prevention portion 76 protruding toward the fixed gripping member 70C at the distal end of the second movable gripping member 70R. The bending portion 71 is moved in the forward direction indicated by arrow F, causing the other end WE side of the wire W held by the fixed gripping member 70C and the second movable gripping member 70R to bend toward the reinforcing bar S side at the gripping position of the fixed gripping member 70C and the second movable gripping member 70R, using the slip prevention portion 76 as a fulcrum. Figure 20C In the image, the first movable gripping component 70L is not shown.

[0195] Figure 16The diagram shows the twisted state of the wire W. After one end of the wire W is bent towards the rebar S, the motor 80 is further driven in the normal rotation direction, thereby causing the movable member 83 to move further in the direction of arrow F, which is the forward direction. When the movable member 83 moves to a predetermined position in the direction of arrow F, the movable member 83 disengages from the lock of the rotation limiting member 84, and the adjustment of the rotation by the rotation limiting member 84 of the movable member 83 is released. As a result, the motor 80 is further driven in the normal rotation direction, thereby causing the gripping unit 70 holding the wire W to rotate and twist the wire W. The gripping unit 70 is biased backward by a spring (not shown), and the gripping unit 70 twists the wire W while applying tension to the wire W. Therefore, the wire W does not slack off, and the rebar S is tied with the wire W.

[0196] Figure 17 The diagram shows the state in which the twisted wire W is released. After the wire W is twisted, the motor 80 is driven in the opposite rotational direction, thereby causing the movable part 83 to move in the rearward direction as indicated by arrow R. That is, in the movable part 83, the rotational operation interlocked with the rotation of the motor 80 is restricted by the rotation limiting member 84, and the rotation of the motor 80 is converted into linear movement. As a result, the movable part 83 moves in the rearward direction. Associated with the operation of the movable part 83 moving in the rearward direction, the first movable gripping member 70L and the second movable gripping member 70R are displaced in a direction away from the fixed gripping member 70C, and the gripping unit 70 releases the wire W. When the binding of the rebar S is completed and the rebar S is pulled out from the rebar binding machine 1A, conventionally, the rebar S may be jammed by the guide unit, and the rebar S may be difficult to remove, which in some cases degrades operability. On the other hand, by configuring the movable guide unit 55 of the second guide unit 51 to be able to rotate in the direction of arrow H, when the rebar S is pulled out from the rebar tying machine 1A, the movable guide unit 55 of the second guide unit 51 does not jam the rebar S, and thus improves operability.

[0197] <An example of the function and effect of the rebar tying machine in this embodiment>

[0198] In a rebar tying machine that feeds wire and winds it around a rebar and then twists it to bind the rebar, the coiled wire is difficult to expand in the radial direction of the coil, which allows the guide that forms the feed path for winding the wire around the rebar to move.

[0199] Meanwhile, in a rebar tying machine having the following structure, after the wire is fed in the forward direction and wound around the rebar, the wire is fed in the reverse direction and cut by being wound around the rebar, and the position where one end of the wire and the other end of the wire intersect each other is twisted to tie the rebar, and the feeding of the wire is temporarily stopped in order to switch the wire feeding direction.

[0200] When the wire feed is temporarily stopped, a small amount of wire is fed in the forward direction until the wire feed stops, and thus the wire wrapped around the bundle is displaced in the radial expansion direction. For this reason, in rebar tying machines according to related art, the guide that forms the feed path for the wire wrapped around the rebar is fixed. Therefore, the rebar is stuck by the guide unit and difficult to pull out, resulting in poor operability.

[0201] Figure 21A and Figure 21B This describes an example and operational effect of the rebar tying machine according to this embodiment. Below, examples of the operational effects of the rebar tying machine of this embodiment will be described in terms of the operation of inserting the rebar into the coiling guide unit and the operation of pulling the rebar from the coiling guide unit. For example, when tying the rebar S constituting the foundation with wire W, during operation of the rebar tying machine 1A, the opening between the first guide unit 50 and the second guide unit 51 of the coiling guide unit 5A faces downwards.

[0202] When performing the binding operation, the opening between the first guide unit 50 and the second guide unit 51 points downwards, and the rebar binding machine 1A is positioned as shown in the image. Figure 21A As indicated by arrow Z1, the steel bar S moves downwards and enters the opening between the first guide unit 50 and the second guide unit 51.

[0203] When the binding operation is completed and the rebar binding machine 1A is in operation as described above... Figure 21B When moving in the lateral direction indicated by arrow Z2, the second guide unit 51 is pressed against the steel bar S bound by wire W, and the movable guide unit 55 on the distal side of the second guide unit 51 rotates about the axis 55b, which serves as the fulcrum, in the direction of arrow H.

[0204] Therefore, each time wire W is tied to rebar S, the tying work can be performed sequentially simply by moving the rebar tying machine 1A in the lateral direction without raising it each time. Thus, (because simply moving the rebar tying machine 1A in the lateral direction is sufficient compared to moving it upwards once and then downwards) the restrictions on the direction and amount of movement of the rebar tying machine 1A can be reduced in the operation of pulling out the rebar S tied to wire W, thereby improving work efficiency.

[0205] Additionally, as in Figure 19B As shown, the fixed guide unit 54 of the second guide unit 51 is fixed and not displaced, and the position of the wire W in the radial direction can be limited by the above-described binding operation. Accordingly, in the operation of winding the wire W around the reinforcing bar S, the position of the wire W in the radial direction can be limited by the wall surface 54a of the fixed guide unit 54, thereby suppressing the radial displacement of the wire W guided to the gripping unit 70, thereby suppressing the occurrence of gripping failure. As described above, the reinforcing bar binding machine according to the related art, which winds the wire around the reinforcing bar and then twists it to bind the reinforcing bar, has a structure in which, because there is no feed for pulling back the wire and no operation to temporarily stop the wire feed and reverse the feed direction, it is difficult for the coiled wire to expand in the radial direction of the coil. For this reason, the guide corresponding to the fixed guide unit of this embodiment is unnecessary. However, even in such a reinforcing bar binding machine, when the fixed guide unit and movable guide unit of the present invention are applied, it is still possible to suppress the radial expansion of the coil of wire wound around the reinforcing bar.

[0206] Figure 22A An example illustrating the operational effect of the rebar tying machine of this embodiment is shown, and Figure 22B An example of the operation and problems of a conventional rebar tying machine is shown. Below, an example will be described regarding the form of the wire W used to tie the rebar S, comparing the operational effect of the rebar tying machine of this embodiment with that of a conventional rebar tying machine.

[0207] As in Figure 22B As shown, in a conventional rebar tying machine, in the wire W being tied to the rebar S, one end WS and the other end WE of the wire W are oriented in the opposite direction to the rebar S. Therefore, the distal ends of the wire W, which are the twisted portions of the wire W used to tie the rebar S, protrude significantly from the rebar S. If the distal ends of the wire W protrude significantly, there is a possibility that the protrusions will interfere with the operation and hinder the work.

[0208] Furthermore, after the reinforcing bar S is tied, concrete 200 is poured into the location where the reinforcing bar S is laid. At this time, in order to prevent one end WS and the other end WE of the wire W from protruding from the concrete 200, the thickness from the end of the wire W tied to the reinforcing bar S (in) Figure 22B In this example, the thickness from one end WS of the wire W to the surface 201 of the poured concrete 200 is necessary to be maintained at a predetermined dimension S1. Therefore, in a construction where one end WS and the other end WE of the wire W face the direction opposite to that of the reinforcing bar S, the thickness S12 from the laying position of the reinforcing bar S to the surface 201 of the concrete 200 increases.

[0209] On the other hand, in the rebar tying machine 1A of this embodiment, the wire W is bent by the bending portion 71 such that: one end WS of the wire W wrapped around the rebar S is positioned closer to the rebar S than the first bending portion WS1, which is the bending portion of the wire W, and the other end WE of the wire W wrapped around the rebar S is positioned closer to the rebar S than the second bending portion WE1, which is the bending portion of the wire W, is the bending portion of the rebar S. In the rebar tying machine 1A of this embodiment, the wire W is bent by the bending portion 71 such that: one of the bending portions bent by the initial bending portion 72 during the operation of holding the wire W by the first movable gripping member 70L and the fixed gripping member 70C, and the bending portions bent by the fixed gripping member 70C and the second movable gripping member 70R during the operation of tying the wire W around the rebar S, becomes the top of the most protruding part of the wire W in the direction away from the rebar S.

[0210] As a result, such as in Figure 22A As shown, in the rebar tying machine 1A according to this embodiment, the wire W tied to the rebar S has a first bend WS1 between the twisted portion WT and one end WS, and one end WS of the wire W is bent toward the rebar S such that one end WS of the wire W is positioned closer to the rebar S than the first bend WS1. A second bend WE1 is formed between the twisted portion WT and the other end WE of the wire W. The other end WE of the wire W is bent toward the rebar S such that the other end WE of the wire W is positioned closer to the rebar S than the second bend WE1.

[0211] exist Figure 22A In the example shown, two bends are formed on the wire W (in this example, a first bend WS1 and a second bend WE1). Of the two bends, the first bend WS1, which protrudes most prominently in the direction away from the reinforcing bar S (opposite to the reinforcing bar S) in the wire W bound to the reinforcing bar S, is the top Wp. Both the WS and WE ends of the wire W are bent so that they do not protrude beyond the top Wp in the direction opposite to the reinforcing bar S.

[0212] In this manner, by setting one end WS and the other end WE of the wire W to not protrude beyond the top Wp formed by the bent portion of the wire W in the direction opposite to the reinforcing bar S, the reduction in operability caused by the protrusion of the ends of the wire W can be suppressed. Because one end WS of the wire W is bent towards the reinforcing bar S and the other end WE of the wire W is bent towards the reinforcing bar S, the amount of protrusion from the twisted portion WT of the wire W on the distal side is less than in the conventional case. Therefore, the thickness S2 from the laying position of the reinforcing bar S to the surface 201 of the concrete 200 can be thinner than in the conventional case. Therefore, the amount of concrete to be used can be reduced.

[0213] In the rebar tying machine 1A of this embodiment, wire W is wound around rebar S by feeding in the forward direction, and one end WS of the wire W wound around rebar S by feeding wire W in the opposite direction is bent toward rebar S by bending portion 71 while held by fixed gripping member 70C and first movable gripping member 70L. Furthermore, the other end WE of the wire W cut by cutting unit 6A is bent toward rebar S by bending portion 71 while held by fixed gripping member 70C and second movable gripping member 70R.

[0214] As a result, such as in Figure 20B As shown, the gripping positions of the fixed gripping member 70C and the first movable gripping member 70L are taken as fulcrum 71c1, and as in Figure 20C As shown, the gripping position of the fixed gripping member 70C and the second movable gripping member 70R is taken as the fulcrum 71c2, and the wire W can be bent. In addition, by shifting in the direction close to the reinforcing bar S, the bending portion 71 can apply a force that compresses the wire W in the direction of the reinforcing bar S.

[0215] As described above, in the rebar tying machine 1A of this embodiment, since the wire W is firmly held at the holding position and bent with fulcrums 71c1 and 71c2, it is feasible that the force of squeezing the wire W is reliably applied to the desired direction (rebar S side) without being dispersed to other directions, thereby reliably bending the ends WS and WE sides of the wire W in the desired direction (rebar S side).

[0216] On the other hand, for example, in a conventional binding machine that applies force in the direction of twisting the wire W while the wire W is not being held, the end of the wire W can be bent in the direction of twisting the wire W. However, the force used to bend the wire W is applied while the wire W is not being held, so the direction of bending the wire W is not fixed, and in some cases the end of the wire W may face outwards opposite to the reinforcing bar S.

[0217] However, in this embodiment, as described above, because the wire W is firmly held at the gripping position and bent with fulcrums 71c1 and 71c2, the ends WS and WE of the wire W can reliably point towards the reinforcing bar S side.

[0218] Furthermore, if the end of the wire W is bent toward the side of the reinforcing bar S after the wire W is twisted to bind it, there is a possibility that the binding position where the wire W is twisted will loosen and the binding strength will decrease. Moreover, when the wire W is twisted to bind the reinforcing bar S and then an attempt is made to bend the end of the wire by applying force in the direction of further twisting the wire W, there is a possibility that the binding position where the wire W is twisted will be damaged.

[0219] On the other hand, in this embodiment, before twisting the wire W to bind the reinforcing bar S, one end WS side and the other end WE side of the wire W are bent toward the reinforcing bar S, so that the binding position of the twisted wire W is not loosened and the binding strength is not reduced. Moreover, after twisting the wire W to bind the reinforcing bar S, no force is applied in the direction of twisting the wire W, so as not to damage the binding position of the twisted wire W.

[0220] Figure 23A and Figure 24A An example of the operational effect of the rebar tying machine according to this embodiment is shown, and Figure 23B and Figure 24B Examples of the operation and problems of conventional rebar tying machines are shown. In the following, regarding preventing the wire W from slipping off the holding unit during the operation of winding the rebar S, an example of the operational effect of the rebar tying machine according to this embodiment compared to a conventional rebar tying machine will be described.

[0221] As in Figure 23B As shown, the conventional gripping unit 700 of the rebar tying machine includes a fixed gripping component 700C, a first movable gripping component 700L, and a second movable gripping component 700R. A length limiting unit 701 is provided in the first movable gripping component 700L, and the wire W wound around the rebar S abuts against the length limiting unit 701.

[0222] In the operations of feeding (pulling back) the wire W in the reverse direction and winding it around the reinforcing bar S, and in the operation of twisting the wire W by the gripping unit 700, when the distance N2 from the gripping position of the wire W by the fixed gripping member 700C and the first movable gripping member 700L to the length limiting unit 701 is short, the wire W held by the fixed gripping member 700C and the first movable gripping member 700L is likely to come loose.

[0223] In order to make it difficult for the held wire W to come out, it is simply necessary to extend the distance N2. However, for this purpose, it is necessary to extend the distance from the holding position of the wire W in the first movable holding member 700L to the length limiting unit 701.

[0224] However, if the distance from the gripping position of the wire W in the first movable gripping member 700L to the length limiting unit 701 is increased, the size of the first movable gripping member 700L is increased. Therefore, in the conventional construction, the distance N2 from the gripping position of the wire W by the fixed gripping member 700C and the first movable gripping member 700L to one end WS of the wire W cannot be extended.

[0225] On the other hand, such as in Figure 23AAs shown, in the gripping unit 70 of this embodiment, the length limiting unit 74 against which the wire W abuts is set as a separate component independent of the first movable gripping member 70L.

[0226] This makes it feasible to extend the distance N1 from the gripping position of the wire W in the first movable gripping member 70L to the length limiting unit 74 without increasing the size of the first movable gripping member 70L.

[0227] Therefore, even if the first movable gripping member 70L is not enlarged, it is still possible to prevent the wire W held by the fixed gripping member 70C and the first movable gripping member 70L from coming off during the operation of feeding the wire W in the reverse direction to wind around the reinforcing bar S and the operation of twisting the wire W by the gripping unit 70.

[0228] As in Figure 24B As shown, the conventional gripping unit 700 of the rebar tying machine has a protrusion and a recess on the surface of the first movable gripping member 700L facing the fixed gripping member 700C, thereby forming an initial bend 702. The protrusion protrudes toward the fixed gripping member 700C, and the fixed gripping member 700C is inserted into the recess.

[0229] As a result, during the operation of holding the wire W by the first movable gripping member 700L and the fixed gripping member 700C, one end WS side of the wire W protruding from the gripping position of the first movable gripping member 700L and the fixed gripping member 700C is bent, and during the operation of feeding the wire W in the opposite direction to wind around the reinforcing bar S and the operation of twisting the wire W by the gripping unit 700, the effect of preventing the wire W from coming off can be obtained.

[0230] However, because one end of the wire W, WS side, is bent inward toward the wire W passing between the fixed gripping member 700C and the second movable gripping member 700R, the bent end of the wire W, WS side, can be locked in contact with the wire W that is fed in the opposite direction to be wound around the reinforcing bar S.

[0231] When the bent end WS of wire W is caught by wire W fed in the opposite direction to wind around the reinforcing bar S, there is a possibility that the winding of wire W becomes insufficient or the twisting of wire W becomes insufficient.

[0232] On the other hand, in the gripping unit 70 of this embodiment, as in Figure 24A As shown, on the surface of the fixed grip member 70C facing the first movable grip member 70L, a protrusion and a recess are provided to form an initial bend 72. The protrusion protrudes toward the first movable grip member 70L, and the first movable grip member 70L is inserted into the recess.

[0233] Therefore, in the operation of holding the wire W by the first movable gripping member 70L and the fixed gripping member 70C, the end WS side of the wire W protruding from the gripping position of the first movable gripping member 70L and the fixed gripping member 70C is bent, and in the operation of feeding the wire W in the opposite direction to wind around the reinforcing bar S and the operation of twisting the wire W by the gripping unit 70, the effect of preventing the wire W from coming off can be obtained.

[0234] One end of the wire W, WS side, is bent outward in the opposite direction to the wire W passing between the fixed gripping member 70C and the second movable gripping member 70R, thereby preventing the bent end of the wire W, WS side, from contacting the wire W that is fed in the opposite direction to be wound around the reinforcing bar S.

[0235] Therefore, in the operation of feeding the wire W in the reverse direction to wind around the reinforcing bar S, the wire W is prevented from coming off the holding unit 70, thereby reliably winding the wire W, and in the operation of twisting the wire W, the binding of the wire W can be reliably performed.

[0236] Figure 25A , Figure 25B and Figure 26A An example demonstrating the operational effect of the rebar tying machine of this embodiment is shown, and Figure 25C , Figure 25D and Figure 26B This is an example of the operation and problems of a conventional rebar tying machine. In the following text, regarding the operation of tying rebar S with wire W, an example of the operational effect of the rebar tying machine according to this embodiment will be described, comparing it with related technologies.

[0237] As in Figure 25C As shown, in a conventional construction where a wire Wb with a predetermined diameter (e.g., approximately 1.6 mm to 2.5 mm) is wound around a reinforcing bar S, as in... Figure 25D As shown, because of the high stiffness of the wire Wb, unless the wire Wb is wound around the reinforcing bar S with a sufficiently large force, relaxation J will occur during the winding operation of the wire Wb, and a gap will be generated between the wire and the reinforcing bar S.

[0238] On the other hand, such as in Figure 25A As shown, in as and as in Figure 25BCompared to the conventional case shown, in this embodiment where two wires W with small diameters (e.g., about 0.5 mm to 1.5 mm) are wound around a reinforcing bar S, because the stiffness of the wires W is lower than that of conventional wires, even if the wires W are wound around the reinforcing bar S with a lower force than in the conventional case, the slack of the wires W that occurs during the winding operation is still suppressed, and the wires are reliably wound around the reinforcing bar S at the linear portion K. Considering the function of binding the reinforcing bar S with the wires W, the stiffness of the wires W varies not only according to the diameter of the wires W but also according to the material of the wires W. For example, in this embodiment, a wire W with a diameter of about 0.5 mm to 1.5 mm is described as an example. However, if the material of the wires W is also considered, a difference of at least about tolerance can occur between the lower limit and the upper limit of the diameter of the wires W.

[0239] In addition, such as in Figure 26B As shown, in a conventional construction in which a wire Wb of a predetermined diameter is wound around a reinforcing bar S and twisted, because the wire Wb has high stiffness, even during the twisting operation, the slack of the wire Wb is not eliminated, and a gap L is generated between the wire and the reinforcing bar S.

[0240] On the other hand, such as in Figure 26A As shown, in this embodiment where two wires W with smaller diameters are wound and twisted around a reinforcing bar S, as compared with related technologies, the stiffness of the wires W is lower than that of the conventional case. By twisting the wires W, the gap M between the reinforcing bar S and the wires can be kept small compared with the conventional case, thereby increasing the binding strength of the wires W.

[0241] By using two wires W, the retaining force of the reinforcing bars can be balanced compared to conventional methods, and deviations between the reinforcing bars S after binding can be suppressed. In this embodiment, the two wires W are fed simultaneously (together), and the reinforcing bars S are bound using the two wires W fed simultaneously (together). Feeding the two wires W simultaneously means that when one wire W and the other wire W are fed at approximately the same speed, that is, when the relative speed of the other wire W relative to one wire W is approximately 0. In this example, this meaning is not necessarily limited to this meaning. For example, even when one wire W and the other wire W are fed at different speeds (timed), the two wires W are arranged side by side and advance side by side in the feed path of the wires W, so as long as the wires W are set to be wound around the reinforcing bars S in a side-by-side state, it means that the two wires are fed simultaneously. In other words, the total cross-sectional area of ​​each of the two wires W is a factor determining the retaining force of the rebar, so that even if the timing of feeding the two wires W is deviated, the same result can still be obtained in terms of ensuring the retaining force of the rebar. However, compared with the operation of deviating the timing of feeding the two wires W, it is preferable to feed the two wires W simultaneously (together) because the feeding time required for the operation of feeding the two wires W simultaneously (together) can be shortened, thereby resulting in an increase in the binding speed.

[0242]

[0243] Figure 27A and Figure 27B This is a structural diagram illustrating a variant of the second guide unit in this embodiment. The displacement direction of the movable guide unit 55 of the second guide unit 51 is limited by the guide shaft 55c and the guide groove 55d along the displacement direction of the movable guide unit 55. For example, as in Figure 27A As shown, the movable guide unit 55 includes a guide groove 55d extending along the direction in which the movable guide unit 55 moves relative to the first guide unit 50 (i.e., the direction in which the movable guide unit 55 moves toward and away from the first guide unit 50). The fixed guide unit 54 includes a guide shaft 55c that is inserted into the guide groove 55d and is movable within the guide groove 55d. Therefore, by forming contact and separation directions between the movable guide unit 55 and the first guide unit 50 ( Figure 27A Parallel movement in the vertical direction (within the middle) causes the movable guide unit 55 to be moved from the guide position to the retraction position.

[0244] In addition, such as in Figure 27BAs shown, a guide groove 55d extending in the front-rear direction can be provided in the movable guide unit 55. As a result, the movable guide unit 55 is moved from the guide position to the retracted position by performing a front-rear movement that protrudes from the front end, which is one end of the body 10A, and retracts into the interior of the body 10A. In this case, the guide position is a position in which the movable guide unit 55 protrudes from the front end of the body 10A, such that the wall surface 55a of the movable guide unit 55 exists at the location where the wire W forming the coil Ru passes. The retracted position is a state in which all or part of the movable guide unit 55 has entered the interior of the body 10A. Furthermore, a configuration can be adopted in which the movable guide unit 55 is provided with a guide groove 55d extending in an inclined direction along the direction of contact and separation from the first guide unit 50 and the front-rear direction. The guide groove 55d can be a straight shape or a curved shape (such as an arc).

[0245] As another variation of the rebar tying machine 1A of this embodiment, a structure using two wires W is described; however, the rebar S can be tied with one wire W or two or more wires W. In the rebar tying machine 1A according to this embodiment, the length limiting part 74 is provided in the first guide unit 50 of the coiling guide unit 5A, but it can be provided in the first movable gripping member 70L or another location, as long as it is a component independent of the gripping unit 70 (e.g., a structure supporting the gripping unit 70).

[0246] Furthermore, before the bending operation of the bending section 71 towards the reinforcing bar S is completed, the rotation operation of the holding unit 70 is started, and thus the twisting operation of the wire W can begin. Moreover, after the twisting operation of the wire W is started by initiating the rotation operation of the holding unit 70, the bending operation of the bending section 71 towards the reinforcing bar S can be started and ended before the twisting operation of the wire W is completed.

[0247] Furthermore, although the bending portion 71 is integrally formed with the movable member 83 as a bending unit, the gripping unit 70 and the bending portion 71 can be driven by separate drive units such as motors. Additionally, instead of the bending portion 71, a bending portion or the like formed in a concave-convex shape can be provided in any one of the gripping members 70C, the first movable gripping member 70L, and the second movable gripping member 70R to apply a bending force that bends the wire W toward the reinforcing bar S during the operation of gripping the wire W.

[0248] Figure 28A , Figure 28B , Figure 28C , Figure 28D and Figure 28E This is a structural diagram illustrating a variant of the parallel guide members in this embodiment. Figure 28A In the parallel guide 4B shown, the cross-sectional shape of the opening 4BW (i.e., the cross-sectional shape of the opening 4BW in the direction orthogonal to the feed direction of the wire W) is formed into a rectangular shape, and the longitudinal and transverse directions of the opening 4BW are formed into straight shapes. In the parallel guide 4B, the length L1 of the opening 4BW in the longitudinal direction is slightly longer than the diameter r of the multiple wires W arranged in a radially parallel configuration, and the length L2 in the transverse direction is slightly longer than the diameter r of a single wire W. In this example of the parallel guide 4B, the length L1 of the opening 4BW in the longitudinal direction is slightly longer than the diameter r of both wires W.

[0249] exist Figure 28B In the parallel guide 4C shown, the longitudinal direction of the opening 4CW is formed into a straight shape, and the transverse direction is formed into a triangular shape. In the parallel guide 4C, in order to arrange multiple wires W side by side in the longitudinal direction of the opening 4CW and to guide the wires W by an inclined plane in the transverse direction, the longitudinal length L1 of the opening 4CW is slightly longer than the diameter r of the multiple wires W arranged in a radial direction, and the transverse length L2 is slightly longer than the diameter r of a single wire W.

[0250] exist Figure 28C In the parallel guide 4D shown, the longitudinal direction of the opening 4DW is formed into a curved shape that bends inward in a convex shape, and the transverse direction is formed into an arc shape. That is, the opening shape of the opening 4DW is formed to conform to the shape of the parallel wires W. In the parallel guide 4D, the length L1 of the opening 4DW in the longitudinal direction is slightly longer than the diameter r of the plurality of wires W arranged in a radial direction, and the length L2 in the transverse direction is slightly longer than the diameter r of a single wire W. In this example, the length L1 in the longitudinal direction of the parallel guide 4D is slightly longer than the diameter r of both wires W.

[0251] exist Figure 28D In the parallel guide 4E shown, the longitudinal direction of the opening 4EW is formed into a curved shape that bends outward in a convex shape, and the lateral direction is formed into an arc shape. That is, the opening shape of the opening 4EW is formed into an elliptical shape. The parallel guide 4E has a longitudinal length L1 that is slightly longer than the diameter r of the multiple wires W arranged in a radial direction, and a lateral length L2 that is slightly longer than the diameter r of a single wire W. In this example, the parallel guide 4E has a longitudinal length L1 that is slightly longer than the diameter r of both wires W.

[0252] exist Figure 28E The parallel guide 4F shown includes multiple openings 4FW matching the number of wires W. Each wire W passes through another opening 4FW one after another. In the parallel guide 4F, each opening 4FW has a diameter (length) L1 that is slightly longer than the diameter r of the wires W, and the direction in which the multiple wires W are arranged side by side is restricted by the orientation of the openings 4FW.

[0253] Figure 29 This is a structural diagram illustrating a variant of the guide groove of this embodiment. The guide groove 52B has a width (length) L1 and a depth L2 that is slightly longer than the diameter r of the wire W. A segment wall is formed between one guide groove 52B through which one wire W passes and another guide groove 52B through which another wire W passes, along the feed direction of the wire W. By arranging the plurality of guide grooves 52B, the first guide unit 50 restricts the direction in which multiple wires are arranged in parallel with each other.

[0254] Figure 30A and Figure 30B This is a structural diagram illustrating a variant of the wire feeding unit according to this embodiment. Figure 30A The wire feeding unit 3B shown includes a first wire feeding unit 35a and a second wire feeding unit 35b that feed wires W one after another. The first wire feeding unit 35a and the second wire feeding unit 35b are respectively provided with a first feed gear 30L and a second feed gear 30R.

[0255] Each wire W, fed one after another by the first wire feeding unit 35a and the second wire feeding unit 35b, is in Figure 4A , Figure 4B or Figure 4C The parallel guide 4A shown in the figure or in Figure 28A , Figure 28B , Figure 28C or Figure 28D The parallel guides 4B to 4E shown in the figure and in Figure 5 The guide grooves 52 shown are arranged side by side in a predetermined direction.

[0256] exist Figure 30B The wire feeding unit 3C shown includes a first wire feeding unit 35a and a second wire feeding unit 35b that feed wires W one after another. The first wire feeding unit 35a and the second wire feeding unit 35b are respectively provided with a first feed gear 30L and a second feed gear 30R.

[0257] Each wire W, fed one after another by the first wire feeding unit 35a and the second wire feeding unit 35b, is in Figure 28E The parallel guide 4F shown in the figure and in Figure 29The guide grooves 52B shown are arranged side-by-side in a predetermined direction. In the wire feeding unit 30C, because the two wires W are guided independently, the timing of feeding the two wires W can be offset if the first wire feeding unit 35a and the second wire feeding unit 35b can be driven independently. Even if the operation of winding the reinforcing bar S is performed by starting the feeding of the other wire W from the middle of the operation of winding the reinforcing bar S with one of the two wires W, the two wires W are still considered to be fed simultaneously. Moreover, although the feeding of the two wires W starts simultaneously, if the feeding speed of one wire W is different from the feeding speed of the other wire W, the two wires W are also considered to be fed simultaneously (together).

[0258] Figure 31 This is a view illustrating an example of a second guide unit according to another embodiment. The second guide unit 51B includes a base guide unit 54B and a movable guide unit 55. The base guide unit 54B serves as a third guide unit for limiting the radial position of a coil Ru2 formed by the wire W fed from the first guide unit 50, and the movable guide unit 55 serves as a fourth guide unit for limiting the position of the coil Ru along the axial direction Ru1.

[0259] The base guide unit 54B restricts the position of the radial direction Ru2 of the loop Ru formed by the wire W by means of the wall surface 54a located on the outer side of the radial direction Ru2 of the loop Ru formed by the wire W.

[0260] The movable guide unit 55 includes a wall surface 55a disposed on the distal end of the second guide unit 51B, and the wall surface 55a is formed on both sides of the loop Ru formed by the wire W from the first guide unit 50 in the axial direction Ru1. Therefore, the position of the loop Ru formed by the wire Wl in the axial direction Ru1 is restricted by the wall surface 55a of the movable guide unit 55, and the wire W is guided by the movable guide unit 55 to the base guide unit 54B.

[0261] The movable guide unit 55 is supported on the base guide unit 54B by a shaft 55b that rotates along the axial direction Ru1 of the loop Ru formed by the wire W. The movable guide unit 55 is opened and closed between a guide position and a retracted position by rotational operation about the shaft 55b, which serves as a fulcrum, as shown by arrows H1 and H2. In the guide position, the wire sent from the first guide unit 50 can be guided to the second guide unit 51B. In the retracted position, the rebar tying machine 1A is retracted by being pulled from the rebar S.

[0262] The movable guide unit 55 is pushed by a pressing part such as a torsion spring 57 in the direction indicated by arrow H2, the distance between the distal end of the first guide unit 50 and the distal end of the second guide unit 51B approaches in the direction indicated by arrow H2, and the force of the torsion spring 57 holds the movable guide unit 55 in place. Figure 21A The guide position is shown in the diagram. Additionally, when the movable guide unit 55 is pushed towards the rebar S by pulling it out of the rebar tying machine 1A, the movable guide unit 55 rotates in the direction indicated by arrow H1, and the movable guide unit 55 is opened from the guide position to the position shown in the diagram. Figure 21B The retreat position is shown in the image.

[0263] The second guide unit 51B includes a retraction mechanism (rotation mechanism) 54C that displaces and retracts the base guide unit 54B in a direction separating it from the first guide unit 50. The retraction mechanism 54C includes a shaft 58 supporting the base guide unit 54B and a spring 59 holding the base guide unit 54B in a predetermined guide position.

[0264] The base guide unit 54B is supported so that it can be displaced in the directions indicated by arrows Q1 and Q2 by rotation about an axis 58 serving as a fulcrum. Spring 59 is an example of a pressing part (push-off portion) and is constructed, for example, as a torsion coil spring. Spring 59 has a larger spring load than torsion coil spring 57. The base guide unit 54B is held in place by spring 59. Figure 31 The guide position is shown in the image.

[0265] Figures 32 to 35 This is an illustrative diagram showing an example of the operation of a second guide unit according to another embodiment. The wire W, which is formed in an arc shape by the first guide unit 50 of the coiled guide unit 5A, is wound such that the positions of the two outer points and one inner point of the arc are restricted to three points (the fixed blade portion 60 constituting the parallel guide 4A at the cutting and discharge position P3; and the guide pins 53 and 53b of the first guide unit 50), thereby forming a generally circular loop Ru.

[0266] Therefore, as in Figure 32 As shown, the distal end of the wire W enters the movable guide unit 55, the position of the loop Ru formed by the wire W in the axial direction Ru1 is restricted by the wall surface 55a of the movable guide unit 55, and the wire W is guided by the movable guide unit 55 to the base guide unit 54B.

[0267] When wire W is fed by wire feed unit 3A, such as in Figure 33As shown, the wire W is guided to the base guide unit 54B by the movable guide unit 55. Even when the loop Ru formed by the wire W expands outward in the radial direction Ru2 and the wire W contacts the base guide unit 54B, the base guide unit 54B is still held in a fixed state at the guide position by the force of the spring 59.

[0268] When the wire W is further fed, such as in Figure 34 As shown, the distal end of the wire W abuts against the length limiting portion 74. When a predetermined amount of wire W is further fed until the feeding of wire W is stopped, as in... Figure 35 As shown, the position of the distal end of the wire W is limited by the length limiting portion 74, and therefore, as the distal end of the wire W moves forward along the length limiting portion 74, the loop Ru formed by the wire W expands outward in the radial direction Ru2. However, the base guide unit 54B is held in a fixed state at the guide position by the force of the spring 59.

[0269] As described above, in the operation of forming a loop Ru with the wire W sent from the first guide unit 50, even when the wire W abuts against the base guide unit 54B, the base guide unit 54B is still held in a fixed state at the guide position.

[0270] Furthermore, even when the movable guide unit 55 is pushed to the rebar S during the operation of pulling the rebar tying machine 1A out of the rebar S and thus opening the movable guide unit 55 from the guide position to the retraction position, the base guide unit 54B is still held in a fixed state at the guide position.

[0271] However, when an unexpected external force is applied, the base guide unit 54B resists the pushing force of the spring 59 and rotates about the axis 58, which serves as a fulcrum, in the direction indicated by arrow Q1, and is thus released from the external force. When released from the external force, the base guide unit 54B is pressed by the spring 59 to rotate in the direction indicated by arrow Q2, and the base guide unit 54B returns to the guide position.

[0272] Therefore, by means of the retraction mechanism 54C provided in the base guide unit 54B, the load can be reduced without hindering the formation of the loop Ru of the wire W wound around the reinforcing bar S when an external force is applied. In particular, since the shaft 55b of the movable guide unit 55 and the shaft 58 of the base guide unit 54B are parallel to each other, the base guide unit 54B can be retracted by a large external force (e.g., a force applied to the movable guide 55) applied to the movable guide unit 55.

[0273] The movable guide unit 55 can be opened in the direction of arrow H1 by hand force, and the base guide unit 54B can also be opened in the direction of arrow H1, increasing the range of motion of the second guide unit 51B. This facilitates maintenance or removal of wire blockages, etc. The base guide unit 54B can be retractable by the linear movement described with reference to FIG27.

[0274] As another variation of this embodiment, instead of feeding multiple wires W simultaneously, a structure can be provided in which the wires W are wound around the reinforcing bar S by being fed one after another, multiple wires are wound, and then the multiple wires are wound around the reinforcing bar S by being fed in the opposite direction.

[0275] In addition, a hopper can be provided to hold short wires W, and multiple wires W can be supplied.

[0276] Furthermore, the material box may not be located in the main body, but the wire can be supplied from a separate wire supply unit.

[0277] It should be noted that the present invention can also be applied to strapping machines for pipes and the like, which use wires as strapping materials.

[0278] Some or all of the embodiments described above can be described as follows.

[0279] (Note 1-1)

[0280] A strapping machine, comprising:

[0281] The housing (material box) that holds the wire can feed the wire;

[0282] Wire feeding unit, for feeding wire that can be fed from the housing;

[0283] A coiling guide that receives wire fed from the wire feed unit and winds it around a bundle; and

[0284] The bundling unit holds and twists the wire wound around the bundle by the coiling guide.

[0285] The curling guide includes:

[0286] A first guiding unit receives wire fed by a wire feeding unit; and

[0287] The second guide unit receives the wire from the first guide unit, and

[0288] The second guidance unit includes:

[0289] Third guiding unit; and

[0290] A fourth guiding unit, which is movable relative to the third guiding unit.

[0291] (Notes 1-2)

[0292] According to the strapping machine of (1-1), the fourth guide unit is rotatably supported by the third guide unit.

[0293] (Notes 1-3)

[0294] According to the strapping machine of (1-1) or (1-2), the third guide unit is set in the main body.

[0295] (Note 2-1)

[0296] A strapping machine, comprising:

[0297] The housing (material box) that holds the wire can feed the wire;

[0298] Wire feeding unit, for feeding wire that can be fed from the housing;

[0299] A coiling guide that causes the wire fed by the wire feed unit to coil and wrap around a bundle; and

[0300] The bundling unit holds and twists the wire wound around the bundle by the coiling guide.

[0301] The curling guide includes:

[0302] A first guiding unit, which winds the wire fed by the wire feeding unit; and

[0303] The second guide unit guides the wire coiled by the first guide unit to the bundling unit, and

[0304] The second guidance unit includes:

[0305] A third guiding unit, which restricts the radial movement of the wire within the loop formed by the wire wound around the bundle; and

[0306] A fourth guiding unit restricts the movement of the wire in the axial direction of the coil.

[0307] (Note 2-2)

[0308] According to the strapping machine of (2-1), the fourth guide unit is rotatably arranged relative to the third guide unit.

[0309] (Notes 2-3)

[0310] According to the strapping machine of (2-2), the fourth guide unit is movable between a guide position and a retraction position, in which the movement of the wire is restricted in the axial direction of the loop, and in the retraction position, the wire is retracted from the wire feed path by rotation, thereby not restricting the movement of the wire.

[0311] (Notes 2-4)

[0312] According to the strapping machine of (2-2) or (2-3), the fourth guide unit rotates about an axis set in the third guide unit.

[0313] (Notes 2-5)

[0314] The strapping machine according to any one of the appendices (2-2) to (2-4), wherein the fourth guide unit is configured such that the other end is rotatably supported on the third guide unit in such a manner that one end can move sideways toward and away from the first guide unit.

[0315] (Notes 2-6)

[0316] The strapping machine according to any one of the appendices (2-1) to (2-5), wherein the third guide unit is rotatably arranged relative to the strapping machine body in the radial direction of the loop,

[0317] The fourth guide unit is rotatably disposed relative to the third guide unit in the radial direction of the ring, and

[0318] The rotation amount (rotation range) of the fourth guide unit is set to be greater than the rotation amount (rotation range) of the third guide unit.

[0319] The third guide is capable of moving within a range that restricts the movement of the wire in the radial direction of the loop formed by the wire.

[0320] Alternatively, the third guide can move beyond the range of movement of the limiting wire in the radial direction of the loop formed by the wire.

[0321] (Notes 2-7)

[0322] According to any one of the appendices (2-1) to (2-6), the strapping machine, wherein

[0323] The third guide unit is rotatably mounted relative to the main body of the strapping machine in the radial direction of the loop.

[0324] The fourth guide unit is rotatably disposed relative to the third guide unit in the radial direction of the ring, and

[0325] The extrusion force used to rotate the fourth guide unit is set to be less than the extrusion force used to rotate the third guide unit.

[0326] The compressive force used to rotate the third guide unit is greater than the force that can restrict the movement of the wire in the radial direction of the coil formed by the wire.

[0327] (Notes 2-8)

[0328] The strapping machine described in any of the appendices (2-1) to (2-5), wherein the strapping machine body is configured to support the third guide unit, and

[0329] The third guide unit is fixed to the main body of the strapping machine.

[0330] (Notes 2-9)

[0331] According to any one of the appendices (2-2) to (2-8), the strapping machine, wherein

[0332] The second guide unit includes a rotating mechanism that rotates the fourth guide unit.

[0333] The rotating mechanism includes a shaft and a pushing part. The shaft supports a fourth guide unit, and the pushing part holds the fourth guide unit in a predetermined position.

[0334] The fourth guide unit can rotate and move to the retraction position by resisting the pushing force of the pusher.

[0335] (Note 2-10)

[0336] According to any one of the appendices (2-1) to (2-5), the strapping machine, wherein

[0337] The main body of the strapping machine is configured to support the third guide unit, and

[0338] The third guide unit is configured to move linearly within the main body of the strapping machine.

[0339] The third guide is capable of moving within a range that restricts the movement of the wire in the radial direction of the loop formed by the wire.

[0340] Alternatively, the third guide can move beyond the range of movement of the limiting wire in the radial direction of the loop formed by the wire.

[0341] (Note 3-1)

[0342] A strapping machine, comprising:

[0343] Main body of the strapping machine;

[0344] The housing (material box) that holds the wire can feed the wire;

[0345] Wire feeding unit, for feeding wire that can be fed from the housing;

[0346] A coiling guide that receives wire fed from a wire feed unit and winds it around a bundle; and

[0347] The bundling unit holds and twists the wire wound around the bundle by the coiling guide.

[0348] The curling guide includes:

[0349] A first guiding unit, which causes the wire fed by the wire feeding unit to bend; and

[0350] The second guide unit guides the wire coiled by the first guide unit to the bundling unit, and

[0351] The second guide unit is configured to move between a position where the second guide unit protrudes toward the main body of the strapping machine and a position where the second guide unit is wholly or partially inside the main body of the strapping machine.

[0352] This application is based on and claims priority to Japanese Patent Application No. 2015-145284, filed on July 22, 2015, and Japanese Patent Application No. 2016-136068, filed on July 8, 2016, the entire contents of which are incorporated herein by reference.

[0353] List of reference numerals

[0354] 1A… Rebar tying machine;

[0355] 2A…material box;

[0356] 20… scrolls;

[0357] 3A… Wire feed unit (feed unit);

[0358] 4A… Parallel guide (feed unit);

[0359] 5A… Coiling Guide Unit (Guiding Unit (Feed Unit));

[0360] 6A…cutting unit;

[0361] 7A…Binding section (binding unit);

[0362] 8A… Bundling unit drive mechanism;

[0363] 30L…first feed gear;

[0364] 30R…Second feed gear;

[0365] 31L…tooth section;

[0366] 31La…tooth root circle;

[0367] 32L…First feed groove;

[0368] 32La…First inclined surface;

[0369] 32Lb…Second inclined surface;

[0370] 31R…tooth section;

[0371] 31Ra…tooth root circle;

[0372] 32R…Second feed groove;

[0373] 32Ra…First inclined surface;

[0374] 32Rb…Second inclined surface;

[0375] 33… drive unit;

[0376] 33a…feed motor;

[0377] 33b…Transmission mechanism;

[0378] 34… Displacement section;

[0379] 50…First guiding unit;

[0380] 51…Second guiding unit;

[0381] 52…Guide trench (guide unit);

[0382] 53… Salesperson;

[0383] 53a…withdrawal organization;

[0384] 54… Fixed guide unit (third guide unit);

[0385] 54a... wall surface;

[0386] 54B…Base boot unit (third boot unit);

[0387] 55…Removable boot unit (fourth boot unit);

[0388] 55a... wall surface;

[0389] 55b… axis;

[0390] 55c…guide shaft;

[0391] 55d…guide trench;

[0392] 60… Fixed blade section;

[0393] 61… Rotating blade section;

[0394] 61a… axis;

[0395] 62… Transmission mechanism;

[0396] 70… grip unit;

[0397] 70C…fixed grip components;

[0398] 70L…First movable grip component;

[0399] 70R…Second movable grip component;

[0400] 71…bend;

[0401] 80… motor;

[0402] 81…reduction gear;

[0403] 82… Rotation axis;

[0404] 83…movable parts;

[0405] W… wire

Claims

1. A strapping machine, comprising: A housing that holds the wires; A wire feeding unit that feeds the wire housed in the housing; A coiling guide that receives the wire fed from the wire feeding unit and winds the wire in a loop shape around a bundle. and A bundling unit that holds and twists the wire wound around the bundle by the coiling guide. The curling guide includes: A first guiding unit receives the wire fed by the wire feeding unit; and A second guiding unit receives the wire from the first guiding unit and guides the wire, which has been coiled by the first guiding unit, to the bundling unit. The binding unit includes a gripping unit that grips the wire fed by the wire feeding unit and guided by the second guiding unit, and the wire feeding unit pulls the wire back after the wire is wrapped around the binding material. The second guiding unit includes: A third guiding unit restricts movement of the wire in the radial direction of the loop formed by the wire wound around the bundle, and the third guiding unit inhibits displacement of the wire guided to the gripping unit in the radial direction; and A fourth guiding unit, which is movable relative to the third guiding unit, and thus capable of moving toward and away from the first guiding unit. The fourth guide unit restricts the movement of the wire in the axial direction of the loop formed by the wire wound around the bundle, and The gripping unit includes a fixed gripping component, a first movable gripping component and a second movable gripping component disposed on both sides via the fixed gripping component. The wire fed by the wire feeding unit passes between the fixed gripping member and the second movable gripping member, and is guided to the coiling guide. The wire, which has been wound around the coiled guide, passes between the fixed gripping member and the first movable gripping member and is gripped.

2. The strapping machine according to claim 1, The third guiding unit is disposed in the main body.

3. The strapping machine according to claim 2, The third guide unit is fixed to the body.

4. The strapping machine according to claim 3, The third guide unit is fixed to the body, thereby restricting the radial movement of the loop formed by the wire wound around the bundle.

5. The strapping machine according to claim 2, The third guide unit is movably disposed within the main body.

6. The strapping machine according to claim 5, The third guide unit is rotatably disposed in the main body.

7. The strapping machine according to claim 5, The third guiding unit is configured to move linearly within the body.

8. The strapping machine according to claim 1, The fourth guide unit is rotatably disposed by the third guide unit.

9. The strapping machine according to claim 8, The fourth guide unit is movable between a guide position and a retracted position, in which the wire is restricted from moving in the axial direction of the loop formed by the wire wound around the bundle, and in the retracted position, the wire is retracted from the feed path of the wire by rotation, thereby not restricting the movement of the wire.

10. The strapping machine according to claim 1, The fourth guide unit is configured such that the other end is rotatably supported on the third guide unit in a manner that allows one end to move toward and away from the first guide unit.

11. The strapping machine according to claim 1, The fourth guide unit is supported by the third guide unit, thereby enabling it to move between a position where the fourth guide unit protrudes from one end of the body and a position where the fourth guide unit is wholly or partially inserted into the body.

12. The strapping machine according to claim 9, The second guiding unit includes a rotating mechanism that rotates the fourth guiding unit. The rotating mechanism includes a shaft and a pushing part. The shaft supports the fourth guide unit, and the pushing part holds the fourth guide unit in a predetermined position. The fourth guide unit can rotate and move to the retraction position by resisting the pushing force of the pusher.

13. The strapping machine according to claim 1, The third guide unit is rotatably disposed relative to the body in the radial direction of the loop formed by the wire wound around the bundle. The fourth guide unit is rotatably disposed relative to the third guide unit in the radial direction of the circle, and The rotation amount of the fourth guide unit is set to be greater than the rotation amount of the third guide unit.

14. The strapping machine according to claim 1, The third guide unit is rotatably disposed relative to the body in the radial direction of the loop formed by the wire wound around the bundle. The fourth guide unit is rotatably disposed relative to the third guide unit in the radial direction of the ring, and The extrusion force used to rotate the fourth guide unit is set to be less than the extrusion force used to rotate the third guide unit.

15. The strapping machine according to claim 1, The binding unit further includes a length limiting unit, wherein the front end of the wire passing through the holding unit abuts against the length limiting unit to limit the position of the front end of the wire.

Images