JP3512985B2 - Spring making machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring manufacturing machine.

[0002]

2. Description of the Related Art Conventionally, the following types of spring manufacturing machines have been known. That is, it has a machine frame having a vertical front wall, a wire processing space formed in front of the front wall of the machine frame, and a wire rod passage for guiding the wire rod sent toward the wire rod processing space, and is fixed to the front wall. The final wire rod guide and the final wire rod guide rotatably provided on the front wall on the side opposite to the wire rod processing space,
At least a pair of wire rod feed rollers for feeding the wire rod while sandwiching the wire rod, facing the wire rod guide across the wire rod working space, provided on the front wall so as to be able to move forward and backward with respect to the wire rod working space, and a bending die was attached. At least 1
Two slides for bending dies, at least one cutter mounting slide provided on the front wall so as to move forward and backward with respect to the wire rod processing space, and a cutter attached, and forward and backward with respect to the wire rod processing space at the front wall And at least one molding tool mounting slide having a molding tool mounted thereon, and said final wire rod guide,
It is provided in the vicinity of the wire rod processing space side so as to be movable back and forth with respect to the front wall, and has a pitch tool mounting rod to which a pitch tool is mounted, and on the outer peripheral surface of the wire rod feeding roller, It is known that one annular groove for a wire is formed (Japanese Patent Publication No. 64-4858).
(See Japanese publication, etc.)

[0003]

[Operation of Spring Manufacturing Machine] The basic operation of the spring manufacturing machine will be described below. The wire rod (workpiece) in a state of being pinched by the wire rod feed roller is fed into the wire rod processing space through the final wire rod guide as the wire rod feed roller rotates. Then, the wire rod that has been fed into the wire rod processing space or has been fed out is subjected to predetermined processing by various tools including a bending die that protrudes into the wire rod processing space, or is in a protruding state, and the spring (general Is formed with a front foot such as a front hook, a coil portion [spring body] following the front foot, and a rear foot such as a rear hook following the front foot. The coil portion is formed by a wire rod continuously fed toward the bending die, which continuously hits the bending die and is curved. In addition, the curved parts of the forefoot and hind legs are formed by bending the wire material sent toward the bending die / molding tool to hit the bending die / molding tool, and the straight parts of the forefoot and hind legs are all Is formed when the wire rod is sent out to the wire rod processing space with the tool in place so that it does not hit the wire rod, and the bent parts of the forefoot and hind legs are one or two wire rods that have been sent to the wire rod processing space and stopped. It is formed by bending with a molding tool. The cutting of the wire rod is performed by cutting the stopped wire rod with a cutter. The pitch of the coil part is adjusted by adjusting the front-back position of the pitch tool with which the coil part hits.

[0004]

[Adjustment of spring manufacturing machine, etc.] In order to feed the wire smoothly into the wire processing space without damage, the wire passage of the final wire guide, the wire passage formed by the wire groove in the portion where the pair of wire feed rollers abut It is indispensable to carry out the adjustment work, that is, the so-called wireline alignment work, in which the and are completely connected in a straight line. The annular groove for a wire rod is shaped so that half of the wire rod having a circular cross section is fitted therein, and the wire rod passage of the final wire rod guide is shaped so that the wire rod having a circular cross section passes through. The final wire rod guide is generally formed by combining a pair of constituent members that are separated by an imaginary cross-section line passing through the center of the wire rod passage.

[0005]

Disadvantages of the Prior Art The conventional spring manufacturing machine has the following drawbacks. That is, every time the diameter of the wire rod changes, the wire rod feed roller must be replaced, the final wire rod guide must be replaced, and the wire line alignment work must be performed, which requires a considerable amount of time and the spring manufacturing machine is activated during that time. Therefore, there is a drawback that the operating efficiency of the spring manufacturing machine is reduced. Further, even when the inner peripheral surface of the wire rod annular groove of the wire rod feed roller is damaged, the wire rod feed roller must be replaced and the wire line alignment work must be performed, resulting in the same drawbacks as described above. .

[0006]

[Means for Solving the Disadvantages] The present invention employs the following means in order to eliminate the above disadvantages. The invention according to claim 1 has a wire rod feeding unit and a wire rod machining unit, and at least one of the wire rod feeding unit and the wire rod machining unit is movable back and forth, and the wire rod machining unit has a vertical front wall. A final wire rod guide fixed to the front wall, having a casing, a wire rod processing space formed in front of the front wall of the casing, and a wire rod passage through which a wire rod sent toward the wire rod processing space passes, At least one slide for bending dies, which is provided across the wire rod processing space so as to face the final wire rod guide and is movable forward and backward with respect to the wire rod processing space on the front wall, and forward and backward with respect to the wire rod processing space on the front wall. At least one cutter mounting slide mounted on the casing, the wire rod feeding unit having a vertical front wall. And a rotatably provided on the front wall of this casing, at least a pair of wire rod feed rollers that feed out toward the final wire rod guide while pinching the wire rod, and on the outer peripheral surface of each wire rod feed roller. Has at least two wire rod annular grooves formed around it, and a pair of wire rod feed rollers abut against each other by adjusting the front and rear positions of the wire rod feed unit or the wire rod processing unit that can move back and forth. Each of the wire rod passages formed by the wire rod annular groove in the section is sequentially connected to the wire rod passage of the final wire rod guide.

[0007]

The invention of claim 1 has the following effects. The replacement work of the wire feed roller and the adjustment work accompanying it can be significantly reduced compared to the conventional one, and the operation efficiency of the spring manufacturing machine can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In this description, the front means the front side in FIG. 1, the rear means the back side, the left means the left side in FIG. 1, and the right means the right side in FIG.

The spring manufacturing machine 1 includes a base 3, a wire rod feeding unit 4 on the left side of the base 3 which can be moved back and forth by means to be described later, and a bolt, nut, etc. on the right side of the base 3. The wire rod processing unit 5 is fixed by (not shown).

The wire rod processing unit 5 includes a vertical front wall 9
Of the front wall 9 having a casing 8 having a wire rod, a wire rod processing space 10 formed in front of the front wall 9, and a wire rod passage 12 through which a wire rod W sent toward the wire rod processing space 10 passes. Final wire guide 11 (see FIG. 5) detachably fixed to the wire 13, and the wire processing space 1
A first bending die slide 16 which is provided on the front wall 9 so as to be able to move back and forth with respect to the wire rod processing space 10 and which is opposed to the final wire rod guide 11 with the first bending die 17 interposed therebetween; Front wall 9 while facing the final wire guide 11 across the wire processing space 10
And a slide 19 for the second bending die on the upper side to which the second bending die 20 is attached, and the front wall 9 that can move forward and backward with respect to the wire rod processing space 10. And the cutter 23
And an upper cutter attachment slide 22 to which is attached. As is well known, a pitch tool attachment rod (not shown) to which a pitch tool (not shown) is attached
Is the wire rod processing space 1 of the final wire rod guide 11.
It is provided to be movable back and forth with respect to the front wall 9 in the vicinity of the 0 side.

The final wire rod guide 11 is constructed by combining a pair of constituent members that are separated by a virtual horizontal section line passing through the center of the horizontal wire rod passage 12.

The second bending die slide 19 is movable back and forth with respect to the wire rod processing space 10 by a known slide actuating device 25. The slide operation device 25 includes a ball screw 26 rotatably provided on the front wall 9.
And a female screw mechanism (not shown) provided on the second bending die slide 19 side with which the ball screw 26 is screwed,
It has a motor (not shown) that rotates the ball screw 26 in a forward and reverse direction. With such a structure, the second bending die slide 19 can be operated by rotating the ball screw 26 in the forward and reverse directions.

The second bending die slide 19 and the first bending die slide 16 are interlocked with each other via a known power transmission mechanism 29 described in detail below. A groove 30 orthogonal to the moving direction of the second bending die slide 19 is formed on the front surface of the second bending die slide 19, and a shaft rotatably provided at the free end of the swing lever 31 in the groove 30. Roller 32 with the heart facing forward and backward
Is fitted in the width direction of the groove 30 without any play, and the base of the rocking lever 31 is fixed to a rotary shaft 33 whose axis is oriented in the front-rear direction, and the rotary shaft 33 is rotatable on the front wall 9. It is provided in. A gear 34 is detachably fitted to the rotary shaft 33 so that power transmission can be easily cut off, and a fan gear 35 is meshed with the gear 34. The base of the fan gear 35 has its axial center in the front-back direction. Axis of rotation 36
The rotary shaft 36 is rotatably provided on the front wall 9, and the swing lever 37 is fixed to the rotary shaft 36. The free end of the swing lever 37 is the right end of the first bending die slide 16. It is designed to face. The first bending die slide 16 is biased by a spring (not shown) in a direction away from the wire rod processing space 10, that is, to the right side, and abuts on the free end of the swing lever 37. With such a configuration, when the second bending die slide 19 moves in the direction away from the wire rod processing space 10, the first bending die slide 16 also moves in the direction away from the wire rod processing space 10 in conjunction with it. On the contrary, the second bending die slide 19 causes the wire rod processing space 10 to move.
Bending die slide 1 when moving in the direction of
6 also moves in the direction of approaching the wire rod processing space 10 in conjunction with it.

The cutter slide 22 is movable back and forth with respect to the wire rod processing space 10 by a known slide actuating device 41 described in detail below. One end of a connecting rod 43 is connected to the cutter slide 22 by a connecting pin 42 whose axial center is oriented in the front-rear direction, and the other end of the connecting rod 43 is pivoted by a connecting pin 44 whose axial center is oriented in the front-rear direction. The base portion of the rocking lever 45 is fixed to a rotary shaft 46 having its axis centered in the front-rear direction. The rotary shaft 46 is rotatable in the casing 8 including the front wall 9, and is directly or indirectly rotated by a motor (not shown) within a predetermined angle range (forward / reverse rotation that is not a full rotation of 360 degrees). It is designed to
With such a configuration, the cutter slide 22 can be moved back and forth with respect to the wire rod processing space 10 by rotating the rotating shaft 46 in the forward and reverse directions within a predetermined angle range.

The state of use of the spring manufacturing machine 1 in a state of being line-symmetrical with the upper second bending die slide 19 and the upper cutter slide 22 with a virtual horizontal line including the center of the wire rod processing space 10 as a symmetry axis. The second bending die slide 19 on the lower side and the slide 2 for the cutter on the lower side, which are used when the
2 is provided on the front wall 9. The structure of the lower second bending die slide 19 is the same as that of the upper second bending die slide 19, and the structure of the lower cutter slide 22 is the same as that of the upper cutter slide 22. .

The wire feeding unit 4 is movable back and forth as follows. That is, a pair of left and right guide rails 50 are provided on the upper surface of the base 3 so that the longitudinal directions thereof are oriented in the front-rear direction, and the guide rails 50 are also arranged in the longitudinal direction in the left side wall of the casing 8 of the wire rod processing unit 5. It is provided so as to face in the direction. A guided member 51 that slides along these guide rails 50 is attached to a casing 52 of the wire rod feeding unit 4. The bottom wall of the casing 52 of the wire rod feeding unit 4 is provided with a required number of female screw members 56 having the same axis centered in the front-rear direction.
A ball screw 55 is screwed through the rear wall of the casing 52, and the ball screw 55 is fixed to a rotating shaft of a forward / reverse rotatable motor 57 fixed to the base 3. With such a configuration, the wire rod feeding unit 4 can be moved back and forth by rotating the ball screw 55 in the forward and reverse directions.

An opening 59 is formed on the upper surface of the lower left guided member 51, and a stopper cam 60 is provided so as to face the opening 59. The stopper cam 60 is rotated by a motor 61 which can rotate in the normal and reverse directions. It is done like this. With such a structure, the wire rod feeding unit 4 can be locked by pressing the stopper cam 60 against the guide rail 50 through the opening 59, while the stopper cam 60 can be locked by the guide rail 5.
By separating from 0, the wire rod feeding unit 4 can be made free.

The feed mechanism for the wire W will be described with reference to FIGS. 1 and 3. The front wall 53 of the casing 52 has three vertically elongated long holes 64 formed at predetermined intervals in the left-right direction. A pair of upper and lower bearings 65 are vertically slidably fitted in the elongated holes 64, and the front portion of the roller shaft 66 with its axis oriented in the front-back direction is prevented from moving back and forth with respect to the bearing 65. It is rotatably fitted. The rear portion of the roller shaft 66 is rotatably held on the rear wall of the casing 52 via a bearing (not shown). The front end of the roller shaft 66 is the roller shaft 66.
It is designed to move up and down slightly with the rear end of the rear as a fulcrum. Each roller shaft 66 uses a gear train so that all the lower roller shafts 66 rotate clockwise in FIG. 1 and all the upper roller shafts 66 rotate counterclockwise (not shown). ), And one roller shaft 66 is rotated by a motor (not shown).

The lower bearing 65 is in contact with the upper end of a position adjusting screw shaft 69 screwed into a screw hole 68 formed in the thick portion of the front wall 53 and having an axial center directed vertically.

A pressure device 71, which will be described in detail below, is provided on the front wall 53. The pressure device 71 includes a pressure spring 72, which is a leaf spring and is mounted on the upper bearing 65.
A spring pressing plate 73 placed on the pressure spring 72,
It has a rod 74 of which length is adjustable, which is placed on the spring pressing plate 73 and which is fitted into a hole formed in a thick portion of the front wall 53. The rod 74 has a rotatable female screw cylinder 75 and a male screw shaft 76 screwed into the female screw cylinder 75 and fixed to the thick portion of the front wall 53 so as not to rotate. With such a configuration, by rotating the female screw cylinder 75 and adjusting the total length of the rod 74, the wire rod W can be pinched by a predetermined force by a pair of upper and lower wire rod feed rollers 81 described below. The above-described structure of the wire W feeding mechanism is publicly known (see Japanese Utility Model Publication No. 2-16824).

A fitting portion 79 is provided in the front portion of the roller shaft 66, a flange 80 is fixed to the rear portion of the fitting portion 79, and an annular wire feed roller 81 is fitted in the fitting portion 79. The wire rod feed roller 81 is the flange 8
0 and a flange 85 that is detachably fixed to the front end of the fitting portion 79 by a screw or the like. The wire feed roller 81 is configured so as not to rotate relative to the fitting portion 79 by a known detent mechanism (not shown) such as a spline. The wire rod feed roller 81 is composed of at least two, for example, five ring-shaped roller members 82, and one or more wire rod annular grooves 86 are formed in each roller member 82. A wire rod passage 87 is formed by the wire rod annular groove 86 at the portion where the pair of upper and lower wire rod feed rollers 81 face each other. The wire rod annular groove 86 has a shape in which half of the wire rod W having a circular cross section is fitted.

As shown in FIGS. 1 and 4, a connecting wire guide 91 for connecting the rightmost wire feed roller 81 and the final wire guide 11 is provided as follows. That is, a pair of upper and lower projecting portions 93 are provided on the right side portion of the front wall 53, and are provided so as to project forward with a gap into which the wire rod guide 91 is inserted. A connecting wire rod guide 91 is fitted between the upper and lower protruding portions 93, and the connecting wire rod guide 91 is directed toward the front wall 53 side by a pressing piece 95 detachably fixed to the front end of the protruding portion 93 with a screw 94. Have been held down.
The connecting wire rod guide 91 is composed of five guide forming bodies 92, and a wire rod passage 99 connected to each wire rod passage 87 is formed in each of the guide forming bodies 92. Each guide structure 92 is configured by combining a pair of constituent members that are divided by an imaginary horizontal section line passing through the center of the wire rod passage 99.

Three sets of wire rod feed rollers 8 arranged in the left-right direction
An auxiliary wire rod guide 101 having a structure similar to that of the connecting wire rod guide 91 is provided between the wire rods 1 and on the left side of the leftmost wire rod feed roller 81. That is, the auxiliary wire rod guide 1
Also in 01, five wire rod passages connected to the wire rod passage 87 (wire rod passages similar to the wire rod passage 99) are formed. In addition,
Connecting wire rod guide 91, overhanging portion 93, auxiliary wire rod guide 10
It goes without saying that 1 is designed so as not to interfere with the wire feed roller 81.

As is clear from the above description, when the wire rod passages 87, 99 and the auxiliary wire rod guides 101 are numbered from 1 to 5 in order from the front, the wire rod passages 87 having the same number, A passage group (hereinafter, simply referred to as a passage group) formed of the wire rod passages 99 and the wire rod passages of the auxiliary wire rod guide 101 is arranged in a straight line. Then, one passage group is made of wire rods W having the same diameter. In addition, two or more passage groups have the same diameter W
Alternatively, each of the passage groups may be a wire W having a different diameter. Further, the centerlines of all the passage groups and the centerlines of the wire rod passages 12 of the final wire rod guide 11 are located in the same virtual horizontal plane.

With such a structure, the passage group can be sequentially connected to the wire rod passages 12 of the final wire rod guide 11 by adjusting the front and rear positions of the wire rod feeding unit 4. The front-rear position of the wire feed unit 4 is determined by the rotation amount of the rotation shaft of the motor 57. When the diameter of the wire W, which is the material to be processed, changes, the final wire rod guide 11 itself is replaced with the one corresponding to the diameter of the wire W as in the conventional case. In short, when the diameter of the wire W that is the workpiece is changed, when the wire feed roller 81 or the like having the passage group corresponding to the wire W is set in the spring manufacturing machine 1,
Replacement work of wire rod feed roller 81, connecting wire rod guide 91
It means that the present invention does not require replacement work, replacement of the auxiliary wire rod guide 101, and adjustment work accompanying them. Further, when two or more passage groups have the same diameter W, and when the passage group currently in use is damaged, another passage group should be connected to the wire rod passage 12 of the final wire rod guide 11. Depending on the wire feed roller 81
It means that the present invention does not require the replacement work, replacement work of the connecting wire rod guide 91, replacement of the auxiliary wire rod guide 101 and adjustment work accompanying them.

The manufacture of the spring itself is the same as that of a conventional spring manufacturing machine.

[0027]

[Modifications, etc.] Modifications will be described below. (1) The wire rod feeding unit 4 may be fixed to the base 3 so that the wire rod working unit 5 can be moved back and forth, and both the wire rod feeding unit 4 and the wire rod working unit 5 can be moved to the base plate 3.
Alternatively, it may be movable back and forth. Further, the base 3 may be omitted, and at least one of the wire rod feeding unit 4 and the wire rod processing unit 5 may be movable back and forth with respect to the other.
The means for operating the movable unit of the wire rod feeding unit 4 or the wire rod processing unit 5 is arbitrary. (2) At least two roller components 82 may be provided. It should be noted that the roller structure 82 may be integrated and the wire feed roller 81 may be used. (3) The size of the casing 52 of the wire rod feeding unit 4 may be considerably smaller than that in FIG. 1 as long as the group of wire rod feeding rollers 81, the group of connecting wire rod guides 91 and the group of auxiliary wire rod guides 101 are integrated. Good. (4) The spring manufacturing machine 1 shown in FIG.
The spring manufacturing machine of the present invention includes a spring manufacturing machine in a state where the group of the wire rod feed rollers 81, the group of the connecting wire rod guides 91 and the group of the auxiliary wire rod guides 101 are positioned below the wire rod processing space 10 by rotating them counterclockwise. It is what is done. (5) The number of slides for bending dies may be at least one. At least one cutter slide 22 is enough. (6) At least one pair of wire rod feed rollers 81 may be provided. In addition, the auxiliary wire rod guide 101 may not be provided. (7) The connecting wire rod guide 91 may be an integral body. (8) The connecting wire rod guide 91 is eliminated, the final wire rod guide 11 is projected to the left in FIG. 1, and the left end of the final wire rod guide 11 is the rightmost wire rod feed roller 81.
May be opposed to. In this case as well, it goes without saying that the final wire rod guide 11 does not collide with or interfere with the wire rod feeding unit 4 that moves back and forth.

[0028]

The present invention has the following effects due to the above-described structure. According to the invention of claim 1, the work of exchanging the wire rod feed roller and the work of adjusting the wire feed roller can be significantly reduced as compared with the prior art, and the operation efficiency of the spring manufacturing machine can be improved. According to the invention of claim 2, since the wire rod feed roller is composed of at least two roller members, when the inner peripheral surface of one wire groove is damaged, only the roller member is replaced. It is economical because you can do it. That is, if the wire rod feed roller is not composed of the roller structure, there is no damage to the other wire rod annular groove due to the one wire rod annular groove having damage on the inner peripheral surface. The wire rod feed roller must be replaced as a whole, but according to the second aspect of the invention, this is not the case.

[Brief description of drawings]

FIG. 1 is a front view of a partially crushed portion showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

5 is an enlarged cross-sectional view taken along line VV of FIG.

[Explanation of symbols]

1 Spring making machine 4 Wire feed unit 5 Wire rod processing unit 8 casing 9 front wall 10 Wire processing space 11 Final wire rod guide 12 wire rod passage 16 Slide for 1st bending die 17 1st bending die 19 Slide for second bending die 20 Second bending die 22 Cutter slide 23 Cutter 52 casing 53 front wall 81 Wire feed roller 86 Circular groove for wire rod 87 wire passage 91 Connecting wire guide 99 wire rod passage

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21F 3/06 B21F 35/00

Claims (2)

(57) [Claims] 1. A casing having a wire rod feeding unit and a wire rod working unit, at least one of the wire rod feeding unit and the wire rod working unit being movable back and forth, and the wire rod working unit having a vertical front wall. And a wire rod processing space formed in front of the front wall of this casing,
A final wire rod guide fixed to the front wall, which has one wire rod passage through which the wire rod sent out to this wire rod processing space passes, and a wire rod processing which faces the final wire rod guide while sandwiching the wire rod processing space and also on the front wall. The wire rod has at least one slide for bending dies that can be moved forward and backward with respect to the space, and at least one cutter mounting slide that can be moved forward and backward with respect to the wire rod processing space on the front wall. The feeding unit has a casing having a vertical front wall, and at least a pair of wire rod feed rollers rotatably provided on the front wall of the casing and feeding the wire rod toward the final wire rod guide while pinching the wire rod. , The outer peripheral surface of each wire rod feed roller,
At least two annular grooves for a wire rod are formed around it, and by adjusting the front-back position of a unit that can be moved back and forth among the wire rod feeding unit or the wire rod processing unit, at a portion where a pair of wire rod feeding rollers abut against each other. A spring manufacturing machine in which the wire rod passages formed by the wire rod annular groove are sequentially connected to the wire rod passages of the final wire rod guide. 2. The wire rod feed roller is at least 2
The spring manufacturing machine according to claim 1, wherein the spring manufacturing machine is configured by one roller structure, and at least one annular groove for a wire is formed in the roller structure.