JPH11277346A - C-ring fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the hands of an operator and the like from being injured by the end part of a C-ring fastened with fastening material, and prevent clothes and seat material and the like to be fixed to the fastening material from being damaged by the end part of the C-ring. SOLUTION: A first and a second rear part guide groove 32a and 32b are provided for a lower part jaw 31a and an upper part jaw 31b, a first and a second front part guide groove 33a and 33b continued from the rear part guide grooves 32a and 32b are provided for the lower part jaw 31a and the upper part jaw 31b, the front part guide groove 33a is bent with respect to the rear part guide groove 32a to the direction of a first projected arrow projected to a line normal to a plane, including a line which is extended from the end surface at the lower part jaw 31a side of a C-ring held by the lower part jaw 31a and the upper part jaw 31b, including the center line of the arrow head normal to the end surface of the round wire rod of the C-ring, and the front part guide groove 33b is also bent with respect to the rear part guide groove 32b to the direction opposite to the direction of the first projected arrow head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a C-ring fastening device which is used when a fastening operation is performed by a C-ring obtained by bending a wire into a C-shape.

[0002]

2. Description of the Related Art When manufacturing automobile chairs, beds, furniture and the like, a C-ring fastening device is used for fastening a wire to be fastened, fixing a fabric or a sheet material to the wire, or the like.

FIG. 4 is a schematic view showing a conventional C-ring fastening apparatus, FIG. 5 is a view showing a part of the C-ring fastening apparatus shown in FIG. 4, FIG. 6 is a view taken in the direction of arrow A in FIG. FIG. 7A is a view showing a part of the C-ring fastening device shown in FIG. 4, and FIG.
7 (b) is a partially detailed view of FIG. 6, and FIG. 8 is a schematic cross-sectional view showing a state where the C-ring is held by the upper jaw and the lower jaw of the C-ring fastening device shown in FIGS. FIG. As shown in the figure, a grip portion 8 is provided at a lower portion of the apparatus main body 1,
A magazine 2 is attached near a fastening portion of the apparatus main body 1,
C for sending a C-ring (not shown) loaded in magazine 2
A ring feeder (not shown) is provided. Also,
Lower jaw 4 for deforming the C-ring on device body 1
a, an upper jaw 4b is provided, and an air cylinder 3 for rotating the lower jaw 4a, the upper jaw 4b is provided on the apparatus main body 1. A jaw opening / closing roller (not shown) is provided on a piston rod of the air cylinder 3. , A C-ring feed member (not shown). Also, a push button type directional switching valve 5 connected to the air cylinder 3 in the apparatus body 1.
The push button 6 of the direction switching valve 5 protrudes from the apparatus main body 1, and a trigger 7 for pushing the push button 6 is provided. When the trigger 7 is pulled, the direction switching valve 5 switches, and the air cylinder 3 contracts. When the finger is released from the trigger 7 in this state, the direction switching valve 5 switches, and the air cylinder 3 extends. . The lower jaw 4a is provided with a support hole 11a.
Is rotatably supported by the apparatus main body 1 by the support hole 11a, the lower jaw 4a is provided with an inclined portion 12a, and the configuration of the upper jaw 4b is substantially the same as that of the lower jaw 4a.
The lower jaw 4a and the upper jaw 4b are provided with rear guide grooves 13a and 13b, and the lower jaw 4a and the upper jaw 4b are provided with front guide grooves 14a and 14b continuous with the rear guide grooves 13a and 13b. Lower jaw 4
a, the upper jaw 4b is provided with end guide grooves 15a, 15b aligned with the front guide grooves 14a, 14b.
An end face 22 inclined with respect to a center line of the round wire is formed on a C-ring 21 formed by bending a round wire made of steel or the like into a C shape.
a, 22b, the lower jaw 4a, the upper jaw 4
extends from the lower jaw 4a side end face 22a of the C-ring 21 held in the b and the projection of the end face 22a perpendicular arrow A ₁ in the plane perpendicular to the line a ₁ that includes the center line of the round wire of the C-ring 21 plane perpendicular line a ₂ including elongation and end surfaces 22a perpendicular arrow a ₂ from 1 projection arrow B ₁ direction and the upper jaw 4b side end face 22b of the C-ring 21 to the center line of the round wire of the C-ring 21 and the second direction of the projection arrow B ₂ in the opposite direction, the end face 22a and the end surface 22b is substantially parallel projected on. Also, the front guide groove 14a is connected to the rear guide groove 13a.
The first and the direction of the projection arrow B ₁ of is bent in the opposite direction, also the front guide groove 14b for the rear guide groove 1
Bent in a direction opposite to the second direction of the projection arrow B ₂ with respect 3b.

In this C-ring fastening device, when the trigger 7 is pulled, the air cylinder 3 contracts. Therefore, the jaw opening / closing roller attached to the piston rod of the air cylinder 3 includes the inclined portion 12a of the lower jaw 4a and the upper jaw 4a. 4B, the lower jaw 4a rotates counterclockwise in FIG. 4, the upper jaw 4b rotates clockwise in FIG. 4, and the lower jaw 4a and the upper jaw 4b close. When you release your finger from the trigger 7 from this state,
Since the air cylinder 3 extends, the lower jaw 4a
The upper jaw 4b rotates counterclockwise in FIG. 4 to open the lower jaw 4a and the upper jaw 4b, and the C ring 21 is attached to the piston rod of the air cylinder 3. As shown in FIG. 9A, the lower portion and the upper portion of the C-ring 21 are guided by the rear guide grooves 13a and 13b, respectively, so that the C-ring 21 is moved forward, that is, rightward in FIG. Moving. Then, as shown in FIG. 10, when the C-ring 21 moves further forward, the lower and upper portions of the C-ring 21 are guided by the front guide grooves 14a and 14b, respectively, as shown in FIG. 9B. The end of the C-ring 21 on the lower jaw 4a side is bent rightward in FIG. 9, and the end of the C-ring 21 on the upper jaw 4b side is bent leftward in FIG. In this state, when the trigger 7 is pulled, the air cylinder 3 contracts, so that the lower jaw 4a and the upper jaw 4b are closed and the C ring 21 is closed by the lower jaw 4a and the upper jaw 4b as shown in FIG. Be transformed. Then, as shown in FIG. 9D, when the lower jaw 4a and the upper jaw 4b are further closed, the end having the end face 22a of the C ring 21 is guided by the end guide groove 15b, and the end face 22 of the C ring 21 is moved.
The end having b is guided by the end guide groove 15a, and the material to be fastened (not shown) is fastened by the deformed C ring 21. Thus, the fastening operation is performed.

[0005]

However, such C
In the ring fastening device, when the wire to be fastened or the like is fastened by the C ring 21, as shown in FIG.
Since the angle between the outer surface of the end of the C-ring 21 and the end surfaces 22a and 22b is acute, the end of the C-ring 21 may injure a hand of an operator or the like.
The fabric, sheet material, etc. to be fixed to the wire may be damaged by the end of the wire.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and in a state where the C-ring is fastened, the end of the C-ring does not injure a hand of an operator or the like, and the C-ring has an end. It is an object of the present invention to provide a C-ring fastening device in which a cloth, a sheet material, and the like to be fixed by a portion are not damaged.

[0007]

In order to achieve this object, the present invention provides a C-ring in which a wire is bent into a C-shape and has an end surface which is inclined with respect to the center line of the wire and which is substantially parallel to the center. In the C-ring fastening device, the first rear guide groove is provided in the lower jaw, the second rear guide groove is provided in the upper jaw, and the lower jaw is connected to the first rear guide groove. A first front guide groove, a second front guide groove continuous with the second rear guide groove in the upper jaw,
A projection of an arrow extending from the end face on the lower jaw side of the C-ring held by the upper jaw and perpendicular to the end face to a line perpendicular to a plane including the center line of the wire of the C-ring, When one projection arrow is set, the first front end of the first front guide groove is positioned in the direction of the first projection arrow more than the second front end of the second front guide groove. .

[0008]

FIG. 1 is a view showing a part of a C-ring fastening device according to the present invention. FIG. 1 (a) corresponds to FIG. 7 (a),
FIG. 1B corresponds to FIG. 7B. That is, FIG. 1A is a view of the tip of the upper jaw viewed from the side opposite to the surface holding the C-ring, and FIG.
It is the figure seen from the surface side which holds a ring. FIG. 2 is a schematic sectional view showing a state in which the C-ring is held by the upper jaw and the lower jaw of the C-ring fastening device shown in FIG.
As shown in the figure, the lower jaw 31a of the C-ring fastening device having the same structure as the C-ring fastening device shown in FIG.
The first and second rear guide grooves 32 are provided in the upper jaw 31b.
a and 32b are provided, the lower jaw 31a and the upper jaw 31b are provided with first and second front guide grooves 33a and 33b continuous with the rear guide grooves 32a and 32b, and the lower jaw 31a and the upper jaw 31b are provided. Is the front guide groove 3
First and second end guide grooves 34 aligned with 3a, 33b
a and 34b are provided. And the front guide groove 3
3a is a first projection arrow B _{1 with} respect to the rear guide groove 32a.
Direction that is, bent in FIG. 2 paper left and front guide groove 33b is a rear guide with respect to the groove 32b of the second projection arrow B ₂ direction, that is opposite to the first direction of the projection arrow B ₁ 2, that is, to the right in FIG. 2, and the first front end 35 a of the front guide groove 33 a is
b is located in the direction of the _first projection arrow B1 from the second front end 35b.

In this C-ring fastening device, when the air cylinder 3 is extended, the C-ring 21 is pushed by the C-ring feed member attached to the piston rod of the air cylinder 3, so that as shown in FIG. And C
The lower and upper portions of the ring 21 are rear guide grooves 32, respectively.
Guided by a and 32b, the C-ring 21 moves forward. When the C-ring 21 moves further forward,
The lower and upper portions of the C ring 21 are front guide grooves 33, respectively.
a and 33b, as shown in FIG. 3 (b),
The end on the lower jaw 31a side of the C-ring 21 bends to the left in FIG. 3, and the end on the upper jaw 31b side of the C-ring 21 bends to the right in FIG. When the air cylinder 3 is reduced from this state, as shown in FIG. 3C, the lower jaw 31a and the upper jaw 31b are closed, and the C-ring 21 is deformed by the lower jaw 31a and the upper jaw 31b. Then, as shown in FIG.
a, when the upper jaw 31b is further closed, the C ring 21
The end having the end face 22a is guided by the end guide groove 34b, and the end having the end face 22b of the C ring 21 is guided by the end guide groove 34a. Is concluded.

In such a C-ring fastening device,
In a state where the wire to be fastened is fastened by the C-ring 21, as shown in FIG. 3C, the angle formed between the outer surface of the end of the C-ring 21 and the end surfaces 22 a and 22 b becomes obtuse.
The end of the C-ring 21 does not injure the hand of an operator or the like, and the end of the C-ring 21 does not damage a cloth, a sheet material, or the like to be fixed to the wire.

In the above embodiment, the front guide groove 33a is bent in the direction of the _first projection arrow B1 with respect to the rear guide groove 32a, and the front guide groove 33b is bent with respect to the rear guide groove 32b. Te bent in a second direction of the projection arrow B _2, but the first front end of the first front guide groove than the second forward end of the second front guide groove of the first projection arrow It should just be located in the direction.

[0012]

In the C-ring fastening device according to the present invention, the angle formed between the outer surface and the end surface of the end of the C-ring becomes obtuse when fastened by the C-ring. The hand of the worker or the like is not injured, and the fabric, sheet material, etc. to be fixed by the end of the C-ring are not damaged.

[Brief description of the drawings]

FIG. 1 is a view showing a part of a C-ring fastening device according to the present invention.

2 is an upper jaw of the C-ring fastening device shown in FIG. 1,
It is a schematic sectional drawing which shows the state which hold | maintained the C ring at the lower jaw.

FIG. 3 is an operation explanatory view of the C-ring fastening device shown in FIGS. 1 and 2;

FIG. 4 is a schematic view showing a conventional C-ring fastening device.

FIG. 5 is a view showing a part of the C-ring fastening device shown in FIG. 4;

6 is a view as viewed in the direction of the arrow A in FIG. 5;

FIG. 7 is a view showing a part of the C-ring fastening device shown in FIG. 4;

FIG. 8 is a schematic sectional view showing a state in which a C-ring is held by an upper jaw and a lower jaw of the C-ring fastening device shown in FIGS. 4 to 7;

FIG. 9 is an operation explanatory view of the C-ring fastening device shown in FIGS. 4 to 7;

FIG. 10 is an operation explanatory view of the C-ring fastening device shown in FIGS. 4 to 7;

[Explanation of symbols]

 21 C-ring 22a End face 22b End face 31a Lower jaw 31b Upper jaw 32a First rear guide groove 32b Second rear guide groove 33a First front guide groove 33b Second front Guide groove 35a: first front end 35b: second front end

Claims (1)

[Claims] 1. A C-ring fastening device for fastening a wire using a C-ring which is bent into a C-shape and which is inclined with respect to the center line of the wire and provided with an end surface substantially parallel to the wire.
The lower jaw has a first rear guide groove, the upper jaw has a second rear guide groove, and the lower jaw has the first rear guide groove.
Providing a first front guide groove continuous with the rear guide groove,
The upper jaw is provided with a second front guide groove continuous with the second rear guide groove, and extends from the end face of the C-ring held by the upper jaw on the lower jaw side and the C jaw. When a projection of an arrow perpendicular to the end surface onto a line perpendicular to a plane including the center line of the wire of the C ring is a first projection arrow, a first front end of the first front guide groove. Wherein the first front guide groove is positioned in the direction of the first projected arrow from the second front end of the second front guide groove.