JPH0985375A - Method and apparatus for forming spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device manufacturing a spring by simplifying a process and in a short time because the device manufacturing the spring with a restraint shaft tip part, having precise dimensions, is desired. SOLUTION: A wire 14 is fed out from the outlet 19 of a quill 18, and is wound on the shaft core of a take-up machine 30 on shaft. The tip part of the wire is placed between the grooves of the groove member of a groove type restrain shaft end part finishing machine 40, and a first restraint shaft end part is formed by bending the tip part of the wire by a rotary member. And, the tip part of the wire is abutted on the wind-working surface 52 of a wind-working tool 50, and a winding part which is a spring main body is formed. After that, the blade of a restraint shaft tip part blade working machine 60 is inserted into a gap between a winding part formed at the last of the spring main body and a winding part adjacent to the former winding part, the spring main body is turned by the blade along the bend-working surface of a restraint shaft tip part working mandrel 70, and a second restraint shaft tip part is formed. After that, a formed spring is detached from the wire 14 by the blade part 83 of a cutting machine 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring forming apparatus and method for forming a spring, and more particularly to forming a spring having a common locking toe, which is referred to in the art as a leg or finger. The present invention relates to a spring forming device and a method thereof.

[0002]

2. Description of the Related Art Spring winding devices for forming coil springs have been known for some time. January 16, 1990 o
US Pat. No. 4,893, issued to Hdai et al.
No. 491 ("Asahi-Seiki Manufacturing Company, Limi
(assigned to "ted") describes a spring winding device and method for forming a coil spring. Wires are fed from a quill (wire guide) to a forming surface. The forming surface includes a cam mechanism under computer control. The wire rod is moved to the vicinity of the tip of the quill by the driving device.When the wire is fed from the quill to the forming surface, it is bent there. By rotating the forming surface and bending the wire fed from the quill in various directions,
It is possible to form coil springs of various preset shapes and sizes. When the coil spring reaches its predetermined shape and size, the forming surface is pulled away from the tip of the quill by the drive system and the cam mechanism, and this time the cutting tool advances to move the formed coil spring from the wire fed from the quill. Disconnect.

US Pat. No. 4,893,4 to Ohdai et al.
The spring winding device described in No. 91 provides various cutting and winding tools mounted on a tool mounting frame. These tools can be positioned relative to the tip of the quill, as well as the spring forming surface. Here, the tool mounting frame has an opening through which the quill can pass. This allows each tool to move toward and away from the quill with respect to the front and back of the tool mounting frame. With a configuration in which various tools are mounted immediately in front of the tip of the quill, various bending methods can be realized when forming the coil spring. In addition, through computer control of the device, coil springs of various dimensions can be formed.

[0004]

To lock a spring in a particular field of torsion springs and tension springs, a locking shaft end, such as a shaft, eg, a shaft end along the axis through which the spring body is passed. Need. For example, the locking shaft end is used to lock a spring in an electric clutch that repeatedly and continuously pushes a recording paper used in a copying machine. In such fields, springs are manufactured with tight tolerance dimensions for each winding of the spring. These strict tolerances are very important for the spring winding and the locking shaft end that connect the locking shaft end in addition to the spring body. In certain fields, for example, a locking shaft end having a minute length of about 0.1 inch may be required. It is more difficult to manufacture the end of the locking shaft having such a minute length.

Conventionally, the end of the locking shaft is formed on the tool mounting frame (for example, oh as described above) before forming the spring body of the spring.
manufactured using a bending tool mounted on a frame according to Dai et al.). The first bending tool is moved next to the wire as it is fed from the quill, another bending tool bends the wire along the first tool, and another tool bends the wire 90 degrees. ° Moved from below to bend over that angle to bend and finish.

Further, after the spring body is formed, in order to form the locking shaft end portion in a continuous manner with the spring body, use of another process which is unnecessary is included. For example, after forming one locking shaft end and the spring body, the spring lacking the second locking shaft end is separated from the quill to form the second locking shaft end. Forming the second locking shaft end on a different machine after forming the spring body increases manufacturing time. This is because the spring must be cut from the quill and positioned on another machine. The above ohdai
US Pat. No. 4,893,491 of US Pat. No. 4,893,491 makes it difficult to manufacture a spring having a precisely dimensioned locking shaft end, and has a precise dimension having a locking shaft end. There is a demand for an apparatus for manufacturing the above spring, and an apparatus for manufacturing the spring in a short time is desired.

[0007]

SUMMARY OF THE INVENTION The present invention provides an apparatus and method for forming a spring having a spring body and at least one locking shaft end. The device and method allow for the formation of two locking shaft ends prior to cutting the spring from the wire fed from the quill without disconnecting the spring from the spring wrapping device, providing a precisely dimensioned locking shaft end. A spring having a portion is provided.

The device according to the invention comprises means for feeding said wire from a fixed outlet which guides the wire into the path, wherein the first bending means forms a first locking shaft end so that it feeds from the fixed outlet. Bend a first length of wire provided. The second bending means bends the second length portion of the wire sent from the fixed outlet to form the spring body and the third bending means forms the second locking shaft end. Bend a third length of wire from the fixed outlet. The device comprises means for cutting the wire after forming the second locking shaft end.

Further, according to the method of forming a spring of the present invention, the first length portion of the wire rod fed from the fixed outlet and guided in the path forms the first locking shaft end portion. Bent for. The second length of wire sent from the fixed outlet forms a spring body that is continuous with the end of the first locking shaft. A third length of wire delivered from the fixed outlet is bent to form a second locking shaft end that connects to the spring body. The wire is cut after the second locking shaft end is formed.

According to another invention, the first locking shaft end portion has a fixed size because it forms the first portion of the first winding portion of the spring body having the straight portion extending in the tangential direction. Wrap a first length of wire around the axis. The first part of the first winding part is inserted into the groove of the groove member so that the straight part is exposed. The bending member is pivoted along the groove member to bend the straight portion to form the first locking shaft end.

According to another invention, the second locking shaft end portion is provided between the winding portion formed at the end of the spring body or the winding portion immediately before the winding portion and the adjacent winding portion. It is formed by sandwiching an elongated blade. The elongated blade is pivoted to bend a third length of wire along a bending surface to form a second locking shaft end.

The various novel advantages and features mentioned above are pointed out in the appended claims. However, for a better understanding of the present invention and its advantages and other matters obtained by its use, refer to the following embodiments.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A spring forming and locking shaft end processing apparatus according to this embodiment will be described below with reference to FIGS. FIG. 1 shows a spring forming and locking shaft end processing device 1
FIG. Spring forming and locking shaft end processing device 1
The 0 includes a standard computer controlled spring wrap 12 having a vertical tool mounting frame 13. A standard computer-controlled spring winding device 12 feeds wire 1 from fixed outlet 19 via feed roller 16.
It has a quill 18 for feeding 4. The wire rod 14 is
The fixed outlet 19 directs the route. Various tools are mounted on the tool mounting frame 13 to form the springs as shown in FIGS. Spring 20
Is a spring body 26, first locking legs or fingers (hereinafter, referred to as a locking shaft end (axial toe)) 22 and a second locking shaft end (axial toe) provided immediately before and after the spring body 26. toe) 24 is included.

As shown in the flow charts of FIGS. 6 and 7, the first locking shaft end is formed by the step of block 90, and the second locking shaft end is formed by the step of block 92. . The flowcharts of FIGS. 6 and 7 include
The overall control of the process of cutting the wire after forming the first locking shaft end 22, the spring body 26, the second locking shaft end 24 and the second tip is shown. Such a process is controlled by a standard computer controlled spring wrap 12 which will be described in detail below. The first locking shaft end portion 22 is formed from the fixed outlet 19 to the wire 1 having a predetermined length.
4 and then use the axial winder 30 to extend the straight portion from there and wind the first quarter turn, then use the groove type locking shaft end machine 40 to rotate the first quarter It is formed by bending a straight portion extending from one turn. Subsequently, the spring body 26 causes the fixed outlet 1 to contact the wire rod with the winding surface 52 of the winding tool 50.
It is formed by sending the wire from 9 and winding it. Thus, when the spring body 26 is formed, the wire rod 1
4 from the fixed outlet 19 for a further predetermined length. The second locking shaft end 24 engages the spring body 26 with the locking shaft end blade processing machine 60, and a wire of a predetermined flow bends along the bending surface of the locking shaft end processing mandrel 70. Thus, the locking shaft end portion blade processing machine 60 is formed by rotating. After forming the second locking shaft end 24, the wire 14 sent from the fixed outlet 19 is
It cuts by the cutting (shear) tool 80.

Details of the spring forming and locking shaft end processing device 10 will be described with reference to FIGS. here,
8 to 23 show details of various tools mounted on the tool mounting frame 13 shown in FIG. The spring forming and locking shaft end machining apparatus 10 shown in FIG. 1 includes a standard spring winding apparatus 12 having a vertical tool mounting frame 13. The tool mounting frame 13, including its rear surface, has windows 17 for placing each tool around the quill 18. A standard computer-controlled spring winding device 12 is "Asahi-Seiki Ma" from Aichi prefecture.
"Asahi-Seiki NTF2""manufactured by Nufacturing Company, Limited" is known. The standard spring winding device 12 is a computer-controlled machine that controls the spring winding process. Machines like NTF2 are Oh
U.S. Pat. No. 4,893,491 to Dai et al. (assigned to "Asahi-Seiki Manufacturing Company, Limited").

Computer-controlled spring winding device 12
Includes a quill 18 having a fixed outlet 19,
The wire rod from the feed roller 16 passes through it. Under computer control, various tools are brought into position relative to the fixed outlet 19 to form the spring 20. As shown in FIG. 1, the spring forming and locking shaft end processing apparatus 10 includes various tools mounted on a tool mounting frame 13, and the position of each tool forms a spring 20, so that the spring winding apparatus is provided. 12 through FIG. 6 and FIG.
It is computer controlled as shown in the flowchart of FIG.

Each of the tools operably mounted on the mounting frame 13 and connected to the spring winding device 12 for operation includes a shaft processing machine 30 and a groove type locking shaft end processing machine 4.
0, winding processing tool 50, locking shaft end blade processing machine 8
There is 0. The shaft processing machine 30 has a shaft core 34 (see FIG. 8).
Is orthogonal to the vertical tool mounting frame 13 and is movably mounted at an appropriate position in relation to the fixed outlet 19 of the quill 18 by a normal pneumatic drive mechanism 31. The groove type locking shaft end processing tool 40 is arranged at a position facing the fixed outlet 19, and is moved toward or away from the fixed outlet 19 by the drive and cam mechanism 41. The winding surface 52 is adapted to form the spring body 26 of the spring 20 and the wire 14 which is routed to the fixed outlet 19.
It is placed at a position where it is rolled. The winding tool 50 is moved to a predetermined position by the drive mechanism and the cam mechanism 51. The locking shaft end blade processing machine 60 is provided under the fixed outlet 19 so that the blade of the locking shaft end blade processing machine 60 can be inserted into the winding portion formed at the end of the spring body 26 of the spring 20. Will be distributed to. The locking shaft end blade processing machine 60 is moved to an appropriate position in relation to the fixed outlet 19 by the drive mechanism and the cam mechanism 61. The locking shaft end bending mandrel 70 is moved through the window 17 of the tool mounting frame 13 by a cam mechanism and drive mechanism 71 to an appropriate position in relation to the fixed outlet 19. The cutting (shear) tool 80 is
After forming the second locking shaft end 24 of the spring 20, the wire 1
Used to disconnect 4, drive mechanism and cam mechanism 8
1 moves to a position where the function is operated.
Tool drive and cam mechanisms for moving the fixed outlet 19 in one direction are well known to those skilled in the art and are used in conventional spring winding devices. The general drive and cam mechanisms that move the tool into place are:
It is disclosed in the aforementioned US Pat. No. 4,893,491.

The various tools of the spring forming and locking shaft end machining apparatus 10 are used to form a spring 20 having a first locking shaft end 22 and a second locking shaft end 24. It A process of forming the spring 20 and a device for operating the process will be described with reference to FIGS. 6 and 7. At the start of the formation of the spring 20, first, the first locking shaft end 22 is formed under computer control of the spring winding device 12 according to the process of block 90. That is, the wire 14 having a predetermined length
Is fed from the fixed outlet 19 through the guide passage by the feed roller 16. The first 4 of the spring body
To form the one-half turn 45 and the first locking shaft end portion 22,
Two tools are used (axis machine 30 and grooved locking shaft end machine 40). As shown in FIGS. 8 to 10, the shaft processing machine 30 forms the first quarter winding in a state where the straight line portion is extended from the bent portion. According to the preferred embodiment, this straight section is preferably about 0.1 inches. However, this length may be any within a practical range, and the present invention is not limited by this length. The axis processing machine 30 is a tool mounting frame 1
3 includes a locking shaft end processing machine support member 32 for mounting a tool, and a capture pin 36. Rotary actuator 39 and pneumatic slide 38 of pneumatic drive mechanism 31
Is connected to the shaft core 34 and the capture pin 36, rotates the shaft core 34 and the capture pin 36, and
Move to an appropriate position in relation to 9. Mechanisms for pivoting tools as described above by pneumatic, hydraulic, or other means are well known to those of skill in the art.

Under the computer control of the spring winding device 12, the shaft processing machine 30 has a wire rod of a predetermined length sent from the fixed outlet 19 as shown in FIGS. It is controlled to be located between 36. 8 and 9 both show the positions before the shaft core 34 and the capture pin 36 are rotated. FIG. 10 shows a state of the shaft processing machine 30 after the shaft core 34 and the capture pin 36 are rotated (preferably about 90 °). This rotation operation is performed by a rotary cylinder 39 in which the shaft core 34 and the capture pin 36 are rotatably connected under the computer control of the spring winding device.
It is controlled by turning on and off. The amount and rotation angle of the wire 14 delivered from the fixed outlet 19 determine the length of the straight portion and the angle 21 formed by the tip and the axis passing through the spring body 26. When the rotation angle of the shaft core exceeds 90 ° or less, the locking shaft end portion 22 tilted with respect to the shaft passing through the spring body 26 or separated from the shaft.
Is formed. The capture pin 36 meshes with the wire rod 14 so that the wire rod 14 is wound around the shaft core 3 by the pivotal movement of the shaft core 34 and the capture pin 36, and a quarter turn and a straight portion 43 are formed.

In the conventional spring winding device, the first axial winding portion was formed by using a winding processing tool such as the winding processing tool 50. That is, the rolled surface 52 is moved forward of the fixed outlet 19 so that the wire 14 forms its first quarter turn, so
By abutting on 2, the first axial winding was formed. The characteristics of the size of the first quarter turn are very important in the particular application of the spring, and because of the small size of the first locking shaft end 22 of the spring 20, the first There was an error in the axial winding. However, by using the shaft processing machine 30 of the present embodiment, it is possible to manufacture the first quarter turn and the straight portion of precise dimensions. First four
The size of the one-turn winding is determined by the physical characteristics of the shaft core 34. In order to keep the physical dimensions of the first quarter turn within precise error tolerances during bending of the straight section 43, a second tool, a grooved locking shaft end machining Machine 40 is used.

When the shafting machine 30 has completed its processing, ie the formation of the first quarter turn 45 and the straight part 43, the pneumatic drive mechanism 3 under computer control.
The shaft processing machine 30 is separated from the fixed outlet 19 by 1. After that, the groove type locking shaft end processing machine 40 is moved to an appropriate position in relation to the fixed outlet 19. The groove type locking shaft end processing machine 40 is shown in detail in FIGS. 11 to 15. FIG. 11 is a plan view in which the vertical type mounting frame 13 is viewed downward from above. The drawing shows the groove 4 of the groove member 46.
7 shows a state after the quarter turn 45 formed by the shaft processing machine 30 and the straight portion 43 are inserted and before the first locking shaft end 22 is formed. . FIG.
FIG. 6 is a view showing a groove type locking shaft end processing machine viewed from the quill side. In the figure, the quarter turn 45 and the straight portion 43 are the grooves 4
7 shows the state after the insertion of the first locking shaft end portion 22 after the insertion of the first locking shaft end portion 22. FIG. 13 is a side view of a similar configuration. The groove type locking shaft end processing machine 40 includes a support member 44 for mounting the groove type locking shaft end processing machine 40 on the tool mounting frame 13. Rotary air cylinder 42
Is connected to the rotating member 48 and causes the rotating member 48 to rotate to bend the straight portion 43.

The groove type locking shaft end processing machine 40 is adjusted in position by the drive mechanism and the cam mechanism 41 so that the quarter turn 45 and the straight line portion 43 are positioned in the groove 47 of the groove member 46. To be done. The straight portion 43 is adjusted to a predetermined position of the groove member 46 so that the linear portion 43 is exposed from the groove member 46 and the first locking shaft end portion 22 can be formed by the rotating member 48. The rotary member 48 is a cylinder of the cylinder mounted on the rotary member 49.
It is a one-half portion (a fan-shaped cross section). The rotary motion of the rotary member 49 turns on the air cylinder 42 connected to it,
Achieved under computer control by turning off. The configuration related to the rotating operation can be easily known from the technique described above.

14 and 15 are a front view and a side view of the groove type locking shaft end processing machine 40 after the rotating member 48 is rotated and the first locking shaft end 22 is formed. Is. The distance of rotation of the rotary member 48 determines the angle 23 of the locking shaft end 22 with respect to the winding of the spring body 26. The sloping portion 41 of the groove member 46 allows the shaft tip to exceed 90 °, but of course the locking shaft end may be less than 90 °. According to the preferred embodiment, the locking shaft end 22 is preferably finished in a bent state of about 90 °. This angle is achieved by bending the straight section about 110 ° and returning it to about 90 ° due to the elasticity of the linear spring. Since the first quarter turn is located in the groove 47 of the groove member 46, the dimensions of the first quarter turn are maintained when the straight portion 43 is bent. After the straight portion 43 is bent to form the first locking shaft end 22, the groove-working machine 40 is separated from the fixed outlet 19 by the drive mechanism and the cam mechanism 41.

After the formation of the locking shaft end portion is completed as described above and the groove type locking shaft end portion processing machine 40 is separated, the winding processing surface 52 of the winding processing tool 50 has the drive mechanism and the cam mechanism. 51 is moved into position relative to the fixed outlet 19 and forms the spring body 26 of the spring 20.
The spring body can be formed in various ways. For example, an axial tool can be used to form the multiple turns of spring body 26. Furthermore, a winding surface as shown in FIG. 1 or a known multi-type winding surface can be used to form a plurality of winding portions of the spring body. It should be noted that the formation of the plurality of windings is described in US Patent Application No. 07 / 865,353 ("Reell Precisio").
n, Manufacturing Corporation ”)
The method described in "ADAPTIVE SPRING WINDING DEVICE AND METHOD" of is suitable.

US Patent Application No. 07 / 865,3 above
In No. 53, the physical characteristics of the plurality of winding portions of the spring body 26 are controlled by the method described below. The spring winding device sends the wire rod from the fixed outlet 19 to the winding surface 52 in order to wind the wire rod so as to form a predetermined number of turns. The physical properties are precisely maintained between each winding and between the springs by the system for controlling the position of the winding surface 52. The position of the winding surface is adjusted in response to a signal generated by a detector which monitors the flow of wire in the fixed outlet 19.
The signal is indicative of the physical properties of the bent wire during bending.

The control system 53 includes a spring body 2 being formed.
6 receives a signal from an LVDT (linear variable differential transformer; not shown) arranged at a position related to bending, and includes, for example, a computer (not shown) such as Compaq 386s. This LVDT is a "Schaevitz DTR-451" with a PCA-499 type probe.
The digital converter is preferable. Further, in the present embodiment, the LDVT is arranged to detect the position of the wire rod when the wire rod bends from the bending surface 52 during the formation of the coil spring 20. The position of the wire 14 is sensed relative to the fixed outlet 19 to generate a signal indicative of the physical properties of the curved wire 14. The position of the wire 14 may be before or after being bent by the bending surface 52. It can be detected at any place on the downstream side of the fixed outlet 19. In the present embodiment, the LV is detected.
DT is a coil spring 20 after forming a part of the spring body.
It is arranged at a position to detect the inner diameter of the. The inner diameter is a parameter for controlling the dimensional variation. However, the inner diameter is not the only parameter that can be controlled by the control system using LVDT position sensing.

An analog signal proportional to the variation of the distance measured by using the LVDT is supplied to an input / output circuit (not shown). Here, the analog signal from the LVDT is
It is digitized by an analog-digital converter (not shown). The set reference position for such a measurement is known, and the LVDT uses the digital signal supplied to the computer under the control of the software to determine the LVD.
The difference with the position of the probe of T is shown. Standard PID control (Proportional Integral Differential Control)
Is used as a control algorithm for generating a control signal based on a signal obtained by digitizing an analog signal from the LVDT. These digital control signals are supplied to the input / output circuit by the computer and converted into analog signals by the digital-analog converter (not shown). The analog signal is then provided to an amplifier (not shown). The amplifier drives a piezoelectric transducer element (not shown) provided on a piezo slide that finely adjusts the bending surface 52 to maintain the inner diameter of the spring 20 substantially uniform when forming the spring. To amplify the analog signal. In this embodiment, as the amplifier, “Ke
It uses "pco BOP 100-4M power supply".

The position detection by the LVDT, that is, the display of the spring parameters is also performed by another device.
A laser gauge, an inductive probe, or another method can be used to detect the position of the wire for indicating the parameter of the spring when the spring is formed.

In order to finely adjust the bending surface 52, the piezoelectric slide is provided with a piezoelectric conversion element. In the present embodiment, as a piezoelectric transducer, “Physik Instrumen
te GmBH and Comany 844.60LVPZ Piezoelectric Actuator ”
Has been adopted. This piezoelectric transducer is approximately 0.003
Has the ability to move 5 inches. Therefore, the bending surface 52 can be finely adjusted to control the bending of the wire, and the parameters controlled according to the position detection by the LVDT can be maintained substantially uniform during the formation of the spring 20. it can.

After completion of forming the spring body, under computer control, the bending surface 52 is pulled apart and the locking shaft end 24 of the spring 20 is formed according to the process of block 92 of FIG. Further, under the computer control of the spring winding device 12, the two tools of the locking shaft end blade processing machine 60 and the locking shaft end processing mandrel 70 are connected to the second locking shaft end portion 2.
Used to form 4. As shown in FIG. 7, after the final winding portion of the spring body 26 of the spring 20 is formed,
The feed roller 16 feeds a wire having a predetermined length from the fixed outlet 19. The locking shaft end blade processing machine 60 is then arranged so that the blade 68 of the locking shaft end processing machine 60 is inserted between the last formed winding of the spring body 26 and the adjacent winding. The position is adjusted by the drive mechanism and the cam mechanism 61. 16 and 17 show the blade processing machine 6 before the blade 68 is inserted into the spring body 26.
0 is shown. 18 to 20 show the tip blade processing machine 60 after the blade 68 has been inserted into the spring 26. 18 is a side view, FIG. 19 is a plan view, and FIG. 20 is a front view.

The locking shaft end blade processing machine 60 includes a rotating member 66 connected to a blade 68. Air cylinder 6
4 is connected to a rotating member 66 for rotating the blade 68. The locking shaft end blade processing machine further includes a support member 62 fixed to the tool mounting frame 13, and is connected to the support member 62 via the drive mechanism and the cam mechanism 31.

Before adjusting the position of the locking shaft end blade processing machine 60 so that the blade 68 is inserted between the last winding portion of the spring body 26 and the adjacent winding portion, the processing of the locking shaft end portion is performed. The mandrel 70 is placed in proper position in relation to the fixed outlet 19 by the drive mechanism and the cam mechanism 71. The details of the processing mandrel 70 are shown in FIGS.
3 is shown. The working mandrel 70 forms a second locking shaft end 24, and thus provides a working surface for bending a predetermined length of wire rod portion fed from the fixed outlet 19 after forming the spring body 26. Have a function. As shown in FIGS. 19 and 22, the processing mandrel 7
0 moves its bending surface 74 above the locking shaft end blade processing machine 60. The processing mandrel 70 includes a bending surface 74, an indent 76, and an adjusting mechanism 77 for the pin 78.
including.

After the locking shaft end blade processing machine 60 is adjusted so that the blade 68 is inserted into the winding portion formed at the end of the spring body 26, the locking shaft end blade processing machine 60 is In the rotating member 66, the blade 68 causes the spring body to rotate, and the wire rod portion of a predetermined length is bent to the bending surface 74.
Is rotated so as to be bent at an angle 29 of about 90 ° with the winding portion of the spring body. Blade 68 is preferably inserted as described above. However, a similar function can be achieved by inserting the blade 68 between the winding near the last formed winding and the adjacent winding. Further, the blade is thin so that the spring body is not deformed. The indent 76 of the working mandrel 70 can rotate by more than 90 °.
In this embodiment, it is bent at about 110 ° and returned to about 90 ° by the elasticity of the spring. Needless to say, the angle at which the spring is bent can take various forms and is not limited to the above angle. The pivoting movement is controlled by a spring wrapping device under computer control to turn on and off an air cylinder connected to the rotating member 66. The rotation of the spring 20 as described above is shown in FIG.
The spring 20 is shown by a solid line before the rotation of the rotating member 66 of the locking shaft end blade processing machine 60 and by a broken line after the rotation.

The pin 78 is provided on the bending surface of the processing mandrel 70, and the angle 28 of the axis passing through the spring and the spring main body.
Control. The pin 78 supports the spring body 26 at a predetermined position when the spring body is rotated to bend the wire 14 having a predetermined length along the work surface 74. The pin 78 can be moved by the adjusting mechanism 77. Therefore, the pin can be moved in both directions, and the angle between the locking shaft end and the shaft of the spring body 26 can be increased or decreased within a range of about ± 5 °.

As mentioned above, the angle 29 is controlled by the actual amount of rotation of the rotating member of the locking shaft end blade processing machine 60. In this embodiment, the actual bending is about 9
1 °. As described above, the pivoting motion exceeding 90 ° can be adjusted by the indent 76, and the excess pivoting motion (bending process) is intended to be compensated for the desired angle by the elasticity of the wire. Done. However, the rotation of the rotating member 66 can also form a bend of less than 90 °. The rotation angle is controlled by computer control of the spring winding device 12 via a switching operation of the air cylinder 64 connected to the rotating member 66.
After the rotation of the locking shaft end blade processing machine 60, both the locking shaft end blade processing machine 60 and the processing mandrel 60 are
It is pulled away from the fixed outlet 19. At this time, the second locking shaft end portion is not yet completed.

After that, the spring winding device 12 pulls back the wire 14 having a predetermined length sent from the fixed outlet 19 by a predetermined amount until the second locking shaft end portion having an appropriate length is secured. The pullback length is preferably about 0.1 inches, but the invention is not limited to this length. The wire is then cut (sheared) by a cutting tool 80 under computer control of the spring winding device 12.
Is done. The cutting tool 80 has a blade portion 83 for cutting the wire rod stretched from the fixed outlet 19 along the surface of the quill. After the wire is cut, the spring is captured by a magnetic probe (not shown) and dropped on the chute for transfer to the heat treatment furnace. In this manner, the complete spring 20 including the first locking shaft end 22 and the second locking shaft end 24 is formed by the tool operating in the peripheral position of the fixed outlet 19. As described above, the second locking shaft end portion of the spring is conventionally a spring having a special shape formed by the spring winding device (that is, a spring in which the second locking shaft end portion is not formed). Remove from winding device and form second locking shaft end by other device. However, in the present embodiment, a complete spring 2 is provided in one device.
0 can be formed, and a conventional additional process (an additional process for attaching and detaching the spring is necessary because two devices are required) can be eliminated.

The torsion spring shown in FIGS. 2 to 5 is a spring formed according to this embodiment, but this is merely an example. Obviously, other shaped springs having the first and second locking shaft ends can be formed according to the present invention. For example, curved toe
s) on both ends
Can also be formed according to the present invention. For example, the extension spring body and the shaft (projecting
The tool can be modified to create an axial) to create springs with various dimensions and properties. For example, the locking shaft end machining mandrel can include winding surface with varying radii. Thus, it should be apparent that springs having various sizes, shapes and types of spring bodies and locking shaft ends can be provided and formed.

There are many types of wire rods that can be used. For example, a wire having a circular, rectangular, or barrel-shaped cross section can be used, but the present invention is not limited to these. In the present embodiment, a thin wire rod is used so that bending can be achieved by an air-driven cylinder. However, in the case of a thick wire rod, for example, some of the rotating members of the above-mentioned tool may be rotated due to rotation. The driving means may be required. For example, a thick wire may require a hydraulic cylinder, a compressed air driven cylinder to bend it.

The description in the above embodiment is for convenience of explanation, and the order, shape, size and combination are as follows.
It should be broadly construed within the spirit of the present invention.

As described above, according to the present invention, 1
The complete spring can be formed in one device, eliminating the need for the additional steps of the prior art.

[0040]

[Brief description of drawings]

FIG. 1 is a schematic view of a spring forming and tipping machine, with each element shown being used to form a spring having a common locking shaft end.

FIG. 2 is a perspective view of a spring formed according to the present embodiment.

FIG. 3 is a side view of a spring formed according to the present embodiment.

FIG. 4 is a front view of a spring formed according to the present embodiment.

FIG. 5 is a side view of a spring formed according to the present embodiment.

FIG. 6 is a flowchart showing the operation of the spring winding device that forms the spring shown in FIGS.

FIG. 7 is a flowchart showing the operation of the spring winding device that forms the spring shown in FIGS.

FIG. 8 is a side view of the shaft processing machine as viewed from the quill.

FIG. 9 is a front view of the shaft processing machine before the shaft is rotated.

FIG. 10 is a front view of the shaft processing machine after the shaft is rotated.

FIG. 11 is a plan view of the groove type locking shaft end processing machine before the rotary member is rotated.

FIG. 12 is a front view of the groove type locking shaft end processing machine before the rotation member is rotated.

FIG. 13 is a side view of the groove type locking shaft end processing machine before the rotation member is rotated.

FIG. 14 is a front view of the groove type locking shaft end processing machine after the rotary member has rotated.

FIG. 15 is a side view of the groove type locking shaft end processing machine after the rotating member has rotated.

FIG. 16 is a side view of a locking shaft end blade processing machine.

FIG. 17 is a plan view of the locking shaft end blade processing machine in a state where it is not meshed with the spring.

FIG. 18 is a side view of the locking shaft end blade processing machine before being engaged with a spring and before rotating the blade.

FIG. 19 is a plan view of the locking shaft end blade processing machine before the blade is rotated after being engaged with the spring.

FIG. 20 is a front view of the locking shaft end blade processing machine before the blade is rotated after being engaged with the spring.

FIG. 21 is a plan view of the processing mandrel showing the positions of the spring before (solid line) and after rotation (broken line) of the blade of the locking shaft end blade processing machine.

FIG. 22 is a side view of the processing mandrel showing the spring and the blade processing machine of the locking shaft end of the processing mandrel.

FIG. 23 is a side view of the processing mandrel after the rotation of the blade of the locking shaft end blade processing machine.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location B21F 11/00 B21F 11/00 F (72) Inventor scene M. Frost United States Minnesota 55013 Scorpion City, Keystone Avenue 24830

Claims (10)

[Claims] 1. A spring forming device for forming a spring from a wire rod, wherein the spring has a spring body and at least one locking shaft end portion, and the spring body has a plurality of winding portions.
The spring forming device includes means for feeding the wire from a fixed outlet that guides the wire into a path, and bending a first length portion of the wire sent from the fixed outlet to form a spring body. Means, a bending surface, and a second length of wire that is subsequently fed from the feeding means to form a spring body to form a circumferential shaft-shaped locking shaft end that connects to the spring body. A spring forming device, comprising: a bending member rotating means that meshes with a spring body and rotates so as to bend the bent portion along the bending surface. 2. The spring forming device according to claim 1, further comprising means for cutting the wire after forming a shaft-shaped locking shaft end. 3. The bending member rotating means includes a last winding portion or a winding portion immediately before the last winding portion,
Means for inserting an elongated blade between the adjacent winding portions, and means for rotating the elongated blade so as to bend the second length portion along the bending surface. The spring forming device according to claim 1. 4. To form a first portion of a first winding of the spring body having a tangentially extending straight portion,
Means for winding a third length of wire sent from the fixed outlet about an axis of fixed size prior to formation of the spring body, and another axial locking connection to the spring body The spring forming device of claim 1, further comprising: a means for bending the straight portion to form a shaft end. 5. A spring forming device for forming a spring from a wire rod, wherein the spring has a spring body and at least one locking shaft end portion, and the spring body has a plurality of winding portions,
The spring forming device forms means for feeding wire from a fixed outlet and a first portion of an initial winding of the spring body having a tangentially extending straight portion, so that the spring forming device is configured around the axis of fixed dimensions. Means for winding a first length portion of the wire, and first means for rotating the bending member to bend the straight portion so as to form a first locking shaft end portion connected to the spring body, Second means for bending a second length of the wire sent from the fixed outlet to form the plurality of turns of the spring body, and the spring forming device. 6. The winding means bites the predetermined length portion, so that the catching member is arranged in proximity to the fixed size shaft, and the first portion of the winding portion has the straight portion. 6. The spring forming device according to claim 5, further comprising: a shaft having a fixed size and means for rotating the capturing member by a predetermined distance to form a spring. 7. A bent surface and a second locking shaft end portion connected to the spring body are formed.
The spring forming device according to claim 5, further comprising: a unit that rotates in mesh with the spring body to bend the third length portion of the wire along the bending surface. 8. A method of forming a spring from a wire rod, the method comprising: forming a spring body having a plurality of windings from a first length portion of the wire rod fed from a fixed outlet; A second length portion of the wire sent from the fixed outlet to form the spring body to form a circumferential axial shaft stop that forms an acute angle with the body;
And a step of rotating the spring body by rotating a bending member that is in contact with the wire so that the spring body can be bent along a bending surface. 9. The rotating step includes the steps of inserting an elongated blade between the last winding part or a winding part immediately before the last winding part and an adjacent winding part, and the shaft-like locking. 9. Rotating the elongate blade to bend the second length along the bending surface to form an axial end, the method further comprising: Spring forming method 10. A spring forming method for forming a spring, which includes at least one locking shaft end portion and a spring body having a plurality of winding portions, from a wire rod, the spring having a linear portion extending in a tangential direction. A first piece of wire sent from a fixed outlet around an axis of fixed size to form the first part of the first winding of the body.
The step of winding the length portion of the wire, the step of bending the straight portion to form the first circumferential shaft-shaped locking shaft end portion connected to the first portion of the winding portion, and the first step of the wire rod. Forming the remaining portion of the spring body from the wire second length portion fed from the fixed outlet in a continuous manner with the length portion.