JPH0489148A - Two-pin coiling unit and spring forming machine equipped therewith - Google Patents

Abstract

PURPOSE:To form coils of right hand wind and left hand wind by simple operations by changing the stationary side and swiveling side of a base and reversing displacement transmission means, thereby reversing the winds to right hand wind and left hand wind directions with replacement of a small number of lightweight parts. CONSTITUTION:The change from the right hand wind to the left hand wind at the time of forming the straight coil spring is executed by the transfer of a wire to an upper side with respect to the coil 2 in the case of the right hand wind and to a lower side in the case of the left hand wind. The relations of coiling pins T1, T2 are, therefore, reversed. A sliding member II is then positioned and fixed by a reference indexing piece 148 and the fixing of a sliding member I is released to allow swiveling. Then, a swiveling lever 45 is reversed to symmetrically change the disposition of driving lever members 37, 31 with the center line of the coil to change the phase of a driving cam 39, by which the wind is easily changed in a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coiling unit having two coiling pins and a spring forming machine equipped with the coiling unit.

BACKGROUND OF THE INVENTION As a spring forming machine having two coiling pins, for example, Japanese Patent Publication No. 34596/1984 is known. As shown in FIG. 4, a wire 61 is sent out through a wire guide 63 by a pair of feed rollers 62, and a coil forming mechanism 64 (two opposing ) are provided. This coil forming mechanism 64 has a pair of sliders 66a and 66b that can be moved forward and backward by sliding devices 65a and 65b, and coiling pins 57a and 67b are attached to the tips of the sliders 66a and 66b. It is abutted and formed into a coil. The N mover 66b is controlled to advance and retreat by a ball screw 69 from a pulse motor 68 for controlling the coil diameter, and the other slider 66a is slid by an arm 72 provided between the engagers 70a and 70b and rotating around a shaft 71. child 66b
At the same time, the forward and backward movement is controlled at a constant ratio, and the coil diameter is controlled to change.

Problems to be Solved by the Invention Assuming that this structure is arranged to form a right-handed coil spring in the state shown in the figure, when it becomes necessary to form a left-handed coil spring, the coil forming mechanism A sliding device 65a within 64.

65b, it is necessary to change the arrangement of the arm 72 with respect to the wire being sent out, and to adjust the direction of the coiling pins 67a, 67b, which takes time to replace and adjust, and also requires molding a large wire diameter or a thick spring. In machines, sliding devices and the like are also large in size, making it troublesome to handle heavy objects and also poses safety problems.

The present invention was made in view of the above problems of the conventional technology, and its purpose is to make the sliding members of right-handed and left-handed coiling units common, eliminate this replacement work, and reduce weight. right by replacing a few parts.
It is an object of the present invention to provide a coiling unit and a spring forming machine that can be easily operated in the left-hand winding direction in a short time.

! Means for Solving III In order to achieve the above-mentioned object, the present invention has two coil forming mechanism sliders arranged substantially symmetrically with respect to the quill axis and each having a coiling pin at its tip, each having the same base. A cam member is provided on each of the sliders, and a displacement transmitting means for transmitting the displacement of the cam member of the one slider to the base of the other slider is provided so as to be reversible. The displacement of the cam due to the movement of the slider on the side where the base is fixed is transmitted to the base on the swingable side, and by changing the fixed side and the swinging side of the base and reversing the displacement transmission means, a right-handed coil spring is created. It is possible to selectively mold left-handed coil springs, and it is desirable that the slider is provided with a position adjustment means, and the spring molding machine is equipped with this unit. Furthermore, a slide driving means is provided so that either slide can be driven, and the position of the driving means is changed and the displacement transmitting means is reversed to form a coiling unit and a spring forming machine for forming right-handed and left-handed coil springs with variable diameters. It is also desirable that the coiling pin tool holder be able to finely adjust the angle.

In claims 1, 2, and 3, a spring forming mechanism having two coiling pins arranged for forming a right-handed coil spring is changed to forming a left-handed coil spring by inverting the displacement transmitting means. In these cases, in order to accommodate products with different coil diameters, the slider is moved by the slider position adjustment means, the displacement of the cam of the slider on the fixed base side is transmitted to the other base, the base is rotated by a considerable amount, and the two coiling pins are moved. Displace them in a predetermined relationship.

In claim 4.5, when the slider on the fixed base is moved backward by the operation of the driving means, the displacement transmitting means that contacts the plate cam on the slider transmits the displacement of the cam to the other rotatable base to correspond to the displacement of the cam. the two coiling pins are simultaneously displaced in a predetermined relationship. The radius of curvature of the abutting wire rods is changed.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 1 to 3.

A quill 2 is provided concentrically on a tool mounting face plate 3 in front of a pair of feed rollers 1 that send out a hoop wire rod.
Two sliding members 1 each having a coiling pin so that the coil forming mechanism 4 for the sent wire rod faces the quill 2. II is inclined on both sides of the wire axis, and the figure eight shape is arranged almost symmetrically. The base 6 of the sliding member I of the coil forming mechanism is rotatably supported by a bearing on the tool mounting face plate 3 by a pivot shaft 7 mounted perpendicularly to the lower surface. Then, if necessary, it is fixed at a predetermined angle with a plurality of bolts 19 on both side edges of the base 6. A slide groove is formed in the upper surface of the base 6 in the longitudinal direction, and a slider 8 is slidably fitted therein, and a first tool holder 9 is mounted on the upper surface of the tip portion and can be rotated parallel to the tool mounting face plate surface using a pin 10. The second tool holder 12 is supported by the first tool holder 9 with a pin 10 and a pin 11 that is perpendicular to the tool holder 9 so as to be pivotable in a direction perpendicular to the tool mounting face plate surface, and the angle is fixed with two bolts 13. Ru. A forming tool (coiling pin) TI is fixed to the second tool holder 12 with a bolt 14, the amount of protrusion being adjusted.

Further, a plate cam 5 having a cam surface 5a inclined with respect to the sliding direction is fixed to the upper surface of the slider 8, and an adjustment bolt is installed parallel to the tool mounting face plate 3 to finely adjust the angle of the first tool holder 9. 25 is screwed on. Furthermore, slider 8
Two spring guide shafts 15 are installed in the sliding direction on the rear end surface, and a compression spring 18 is interposed between the stop plate 16 at the end of the base 6 and the double number 17 of the spring guide shaft 15, and the slider 8 is always biased in the backward direction. A stopper 20 is fitted into the slide groove of the base 6, and an adjustment screw 21 is fixed in the sliding direction. This adjustment screw 21 is the second
As shown in the figure, the worm wheel 22 is screwed into a central female thread of a worm wheel 22 whose axial movement is restricted by a bracket 23 provided on the base 6. The handle 2 is attached to the bracket 23.
4 is attached, and a worm (not shown) that meshes with a worm wheel 22 is rotatably supported, and a stopper 20 that is prevented from rotating is positioned by turning the handle 24.

The rear end of the slider 8 is moved to a stopper 20 by the force of the spring 18.
is in contact with. Therefore, by turning the handle, the position of the slider, ie, the coiling pin, can be adjusted forward or backward.

Next, regarding the drive device that moves the slider, the base 6
A dogleg-shaped lever 31 is pivoted approximately in the center on a support shaft 30 established on the tool mounting face plate 3 at a position adjacent to the tool mounting face plate. A push rod 32 that comes into contact with the rear end 5b of the plate cam 5 of the slider 8 is attached so that its length can be adjusted. Further, the other arm 31b is provided with a connecting rod 34 that projects in a direction perpendicular to the arm and that pivotally supports a roller 33 at its tip, which can be adjusted in distance from the center of rotation by means of a thumbscrew 35.

The roller 33 is brought into contact with the side surface of a lever 37 fixed to a support shaft 36, and the cam follower 38 at the end of the lever 37 is appropriately rotated by a drive shaft (not shown), with the support shaft perpendicular to the axis of the quill 2 as the center of rotation. The cam 39 is brought into contact with the cam 39. A cam follower 38 of the lever 37 is pressed against the cam surface by a spiral spring provided at the base. Furthermore, a spring mounting shaft 41 is provided on the lower surface of the base 6 at a position away from the pivot shaft 7 and is loosely mounted in the oval hole 3a of the tool mounting face plate 3.
In this example, two tension springs 43 are stretched between the tool mounting face plate 3 and the spring mount 42 on the back surface thereof. Then, the tool mounting face plate 3 is attached to the tool mounting face plate 3 by the flanges at both ends of the spring mounting shaft 41.
The base 6 is stabilized when turning by sandwiching the base 6. Further, a contact surface 6b for a lever roller, which will be described later, is formed on the side surface of the base 6 on the cam 39 side.

The sliding member ■ having the coiling pin T2 is located almost symmetrically with respect to the axis of the feeding wire when the slider 8 of the sliding member I mentioned above is in the forward end state, and the sliding member ■ is located partially symmetrically with respect to the sliding axis. There is a relationship between right-handed and left-handed, which is interchangeable. Necessary identical parts are designated by numerals in the 100s and their explanations are omitted.

These two sliding members 1. A pivot lever 45 that interlocks I[ is rotatably supported on the tool mounting face plate 3 by a support shaft 46 perpendicular to the axis of the quill 2, and has a length of 1i! 45
A roller 46a pivotally supported at the tip of the short arm 45b is attached to the cam surface 5a of the plate cam 5 fixed to the slider 8, and a roller 47b pivoted to the tip of the short arm 45b is attached to the contact surface 106b of the base 106 by the tension spring 43, 143. The ratio of the lengths of the long arm and the short arm is determined so that the slider member is rotated in a substantially constant relationship with respect to the amount of movement of the drive-side slider. Furthermore, sliding member 1. Reference pieces 48 and 148 for determining the position of II when installing are provided at corresponding positions. T3 is a cutting auxiliary core metal inserted into the coil, and TC is a cutting tool that cuts the coil with the core metal T3.

The operation of the unit configured in this way will be explained.

The sliding members (1) and (2) are each positioned at a predetermined angle based on the reference piece 48° (148), and the sliding members (T, I) are fixed to the base 6 on the drive side by bolts 19 depending on the winding direction.

A tapered coil spring for right-handed winding that gradually expands will be molded. With the cam 39 in the starting position, adjust the position of the connecting rod 34 with the knob screw 35 in order to determine the ratio of the levers 31 and 37 so that the sliders 8, 108 move in accordance with the angle of the taper of the coil. In this adjusted state, the rear end 5b of the plate cam 5 of the slider 8 of the sliding member I is pressed against the push rod 32 provided on the arm 31a of the lever 31 by the force of the spring 18. Then, adjust the length of the push rod 32 so that it has the spring diameter at the beginning of winding.

Of course, the stopper 20 is moved back by operating the handle 24 to a position where it does not interfere. By bringing the roller 47a of the swing lever into contact with the cam surface 5a of the plate cam 5, the angle of the lever 45 is determined, which naturally determines the angle of the sliding member (2). First tool holder 109 of coiling bin T2. Second tool holder 1
Adjust the angles in the two directions of 12 to position the forming surface according to the coil diameter. 0 Next, do the same with coiling bin T1 to determine the position of the forming surface so that it abuts against the wire rod curved by coiling bin T2. . Furthermore, the position of a known pitch tool (not shown) is determined in response to the pinch of the coil.

When the wire rod is sent out from the quill 2 by the feed roller 1.1, the wire abuts against the front end molding surface of the coiling bin T2 of the sliding member (I) and is curved.
A coil is formed by colliding with the tip forming surface of No. 1, and the curved wire is wound up to a predetermined pinch using a pitcher.

When the Taber forming cam 39 is rotated, the lever 37.31 moves the slider 8 backward by the necessary expansion amount due to the cam lift, and the coiling bin T1 is separated from the quill center line, and the plate cam 5 moves back to follow the inclination of the cam surface 5a. The pivoting lever 45 is pivoted counterclockwise, and the sliding member (2) is rotated by the tension spring 14 as the roller 47b of the pivoting lever 45 pivots.
3, the coil is rotated clockwise around the rotation axis 107, and the diameter of the formed coil increases (as it moves away from the tip of the quill 2), forming a tapered coil.

Note that the coil is not limited to a tapered shape, but can be formed into any shape such as a drum shape or a drum shape by forming a cam.

To form a left-handed coil spring instead of a right-handed coil spring, the sliding member 1. ■ is installed by inverting the turning lever 45 by 180 degrees without rearranging the position, and the long arm 452 is attached to the plate cam 1.
05, the short arm 45b comes into pressure contact with the contact surface 6b of the base 6.

Also lever 37. Each of the levers 31 is inverted and attached to each support shaft provided at a symmetrical position with respect to the quill centerline.

It is exactly symmetrical about the quill center line with respect to the state shown in FIG. Then, the phase of the cam 39 is shifted by 180@. cam 39
With coiling bin T1 as the starting position, the position of the connecting rod 34 is set to correspond to the coil to be formed, and the coiling bin T1. This is for adjusting the angle and moving in and out of T2.

The wire rod sent out after this adjustment abuts against the forming surface of the coiling bin T1, and the curved wire rod abuts against the forming surface of the coiling bin T2 and is regulated by a pitcher tool to form a coil. At the taper coil creation site, the slider 108 moves backward due to the rotation of the cam 39, making it a sliding member! The base and slider of are the same in that they are pivoted.

When molding a straight coil spring that does not change the coil diameter, change from right-handed winding (shape 13i in the figure) to left-handed winding. For right-handed winding, move the wire above the quill in the figure, and for left-handed winding, move the wire to the bottom. Therefore, the coiling pins Tl, T
The relationship between the two is reversed, and the sliding member (2) is positioned and fixed by the reference piece 148, and the sliding member (2) is released from the fixing, allowing it to rotate, and the mounting of the swing lever 45 is reversed.

When forming a straight coil spring, the push rod 32 of the lever 31 is moved backward, and the coiling pin T is adjusted by adjusting the position of the slider 8 using the handle 24.
1. The position of the coiling pin T2 can be changed via the turning lever 45, and the coil diameter can be changed.

Effects Since the present invention is constructed as described above, the present invention has the following effects.

The sliding member according to claim 1.3 is heavier than right-handed or left-handed coil molding, and requires time and effort to adjust.
The design can be easily and quickly changed by simply reversing the turning lever that connects the two, rearranging the drive lever parts symmetrically with respect to the quill axis, and changing the phase of the drive cam without the need to rearrange the quill. It can be carried out.

According to the second aspect of the present invention, the coil diameter can be adjusted more easily.

According to the fourth aspect of the present invention, a coil having a variable diameter can be freely formed.

According to the sixth aspect of the present invention, the position of the forming surface of the coiling pin can be adjusted easily.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the quill of the present invention, the coil forming mechanism with the handle adjustment member omitted, and the drive mechanism, Fig. 2 is a longitudinal sectional view of the sliding member of the forming mechanism, and Fig. 3 is a longitudinal sectional view of the connecting lever. The plan view and FIG. 4 are schematic diagrams of a conventional two-bin coiling spring forming machine. 2...Quill 6,106...Base 8.108...
・Slider 5.105・・Plate cam 20.120 ・・Stopper 21.121・・Adjustment screw 9, 1 12°31. 45・TI. 09...First tool holder 112...Second tool holder 37...Lever 39...Cam/swivel lever T2...Coiling pin (forming tool)

Claims (6)

[Claims] (1) The bases of the two sliders of the coil forming mechanism, which are arranged almost symmetrically with respect to the quill axis and each have a coiling pin at the tip, are provided so as to be rotatable or fixed on the same plane, and each of the sliders has a cam. A member is provided, and a displacement transmitting means for transmitting the displacement of the cam member of the one slider to the base of the other slider is provided so as to be reversible, and the displacement of the cam due to the movement of the slider on the side to which the base is fixed can be rotated. The present invention is characterized in that a right-handed coil spring and a left-handed coil spring can be selectively molded by changing the fixed side and rotating side of the base and reversing the displacement transmitting means. pin coiling unit. (2) The two-pin coiling unit according to claim 1, further comprising slider position adjustment means. (3) A spring forming machine equipped with the two-pin coiling unit according to claim 1 or 2. (4) The driving means for moving the slider according to claim 1 or 2 is provided so that the mounting position can be changed so as to drive either slider, and the displacement of the cam member of the driven slider is transmitted. A 2-pin coiling unit characterized in that a variable diameter coil spring can be selectively formed into right-handed or left-handed winding by changing the mounting position of the driving means and reversing the installation of the displacement transmitting means. (5) A spring forming machine equipped with the coiling unit according to claim 4. (6) The two-pin coiling unit according to claim 1, 2 or 4, wherein the tool holder to which the coiling pin is attached is provided so that its turning position can be adjusted in a plane parallel to and a plane perpendicular to the tool attachment face plate.