JPH0129611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coil spring manufacturing apparatus, and a method for manufacturing a coil spring that is made of wire and has coil ends at both ends bent in the same shape at a plurality of locations in opposite directions. In the apparatus, each coil spring is disposed at the position of each front claw of a plurality of rotationally driven gripping arms, and the gripping arm sequentially rotates the manufactured coil springs according to the direction of rotation of the gripping arm. a first coil spring configured to be transferred to a series of work stations disposed therein and for bending one coil end of the coil spring into a generally U-shape at a plurality of spaced bend points; a flexing station, a second flexing station following the first flexing station for forming an opposite coil end of the coil spring, and a quenching station following the first flexing station. The first and second bending stations include a central member fixedly arranged in the center of the tool plate and having a cooperating surface for bending on the circumferential side, and radially arranged outside the central member. and a plurality of bending tools for bending the coil ends, each of which is movable toward the central member. Spring pinerests for furniture such as beds and chairs are equipped with a number of double conical coil springs,
The ends of these coil springs are connected in a known manner. This connection is achieved, for example, by twisting the coil ends to adjacent spring coils. In order to manufacture such coil springs inexpensively, a device is used which automatically forms the spring from wire, knots the two ends, and dumps the finished spring into an accumulation channel that feeds it to an assembly machine. There is.

The present invention is covered by a German patent DE of the same applicant as the present application.
- Starting from the prior art disclosed in PS 1073995.

U.S. Pat. No. 2,581,686 discloses a spring core in which the free end of a coil spring is adapted to mate with the coil end of an adjacent coil spring. However, this spring core is not suitable for automatic production because it is difficult to combine coil springs.

GB 807194 shows a coil spring that connects the coil springs together along relatively long straight sides. However, manufacturing such coil springs is complex and requires large amounts of wire.

The object of the present invention is the German patent DE-PS1073995
The object of the present invention is to provide a coil spring manufacturing apparatus that can rapidly manufacture coil springs without knots.

In order to achieve the above-mentioned object, the present invention, viewed in the direction of rotation of the gripping arm, follows the spring coiling station to form one coil end of the coil spring into a substantially U-shape with a plurality of bending points spaced apart from each other. a first flexing station for flexing the coil spring, followed by a second similar flexing station for forming the opposite coil end of the coil spring, and a second flexing station for forming the opposite coil end of the coil spring; A (quenching) station is installed.

An important feature of the invention is the German patent DE-
The knotting device of PS 1073995 has been replaced by a bending station which bends the end coil of each coil spring into a generally U-shape and forms a number of spaced apart bend points at the ends of the coil.

A conventional round circular end coil is bent into a generally U-shape according to the present invention. As a result, the coil ends have a large surface in contact with the furniture upholstery and are better able to absorb forces acting obliquely to the spring axis.

Further advantages are obtained by forming a bend point at the coil end of the coil spring. That is,
These bending points can be used to position (align) the coil spring in the assembly channel with great precision, thus speeding up the actuation of subsequent spring assembly rungs and improving the assembly accuracy of the spring core. It is possible to do so.

The use of simple bending points instead of difficult knots has the advantage of reducing wire usage and increasing the production rate of coil springs. Furthermore, the springs can be aligned very precisely after manufacture, thereby speeding up the production of subsequent assembly bars.

According to the invention, two opposed spring bending stations are provided. One spring bend station forms a bend point at one coil end, and the other spring bend station forms a similar bend point at the other coil end.

If the invention is developed, a single spring bending station can be used. In that case, after bending one coil end, it is necessary to rotate the coil in order to bend the other coil end.

In a preferred embodiment of the invention, each bending station comprises a central member (hereinafter simply referred to as central member) having a cooperating surface for bending on the circumferential side fixedly arranged in the center of the tool plate; The ends of the coil springs are arranged on the outer periphery of the central member with a required gap in the radial direction. Several bending tools are arranged radially around the central member, these bending tools being movable towards the central member, each bending tool being movable towards the end of the coil to be bent. It is possible.

Preferably five different bend points are formed at each coil end. Also proceeding from the helical coil rising towards the end of the coil, a first bending point is formed at the transition between the helical coil and the end coil. A second bending point is provided after passing through the first side, and a third bending point is provided after passing through the first strap. Further, following the third bending point, a fourth bending point is provided after passing through the second side, and this is followed by a fifth bending point after passing through the short second strap. The fifth bending point forms a bent end that is inclined from the plane of the coil end toward the axis of the bent spring.

The base of the U-shaped coil end is formed by a relatively long first strap, the ends of which lead to a short first side and a long second side.

This second long side is followed by a relatively short second strap, which is followed by a bent end (the so-called tail) which is inclined towards the spring axis. This bent end is bent inward with respect to the spring axis and is always directed towards the inside of the coil spring, which provides several advantages at the same time. This bent end also adjusts wire ends of different lengths evenly. If a long wire is cut and a coil spring is made from it, the excess is included in the bent end that slopes toward the spring axis and points toward the bottom. The bent ends are angled inwardly relative to the spring axis to prevent rubbing against the furniture upholstery.

It may be preferable for each coil end of the coil spring to be U-shaped, as explained below, in that the surface containing the coil end is larger than the surface formed by the spring turn leading to the coil end. However, the number of bending points may be greater or less than five. Due to the large surface of the coil ends, forces acting obliquely to the spring axis are better transmitted to the smaller turns of the lower turns of the end coil.

Further advantages are obtained by forming five different bend points in the U-bent coil end. That is, the knees are very useful for positioning (aligning) the coil springs in the alignment station.

According to the invention, the diagonally opposed bending points engage the alignment cams (alignment pieces) of the corresponding alignment levers of the alignment station, thus accurately aligning the coil springs and feeding them to the subsequent assembly rungs. can.

Also, according to a preferred embodiment of the invention, accurate bending can be achieved by fixing the end coils of the coil spring to the outer periphery of the central member during each bending process by the head of a pushing device.

Furthermore, according to a preferred embodiment of the invention, each bending tool is fixed to a slide that is radially displaceable with respect to the central member, each slide being sequentially rhythmically displaceable with respect to the coil end fixed to the central member by means of a pushing device. to engage.

According to this configuration, it is sufficient to provide a single central drive device for all the slide and push devices, thereby reducing the cost of the device and simplifying the structure and maintenance.

Furthermore, in accordance with a preferred embodiment of the invention, each bending tool leaves the coil end when the respective subsequent bending tool has already engaged the coil end. This ensures that one of the bending tools always engages the end coil of the coil spring, preventing undesired displacement of the end coil at the outer periphery of the central member.

By using a single central member, all slides can be driven by a single curved plate. Each slide is provided with a rotating roller whose axis of rotation is normal to the longitudinal axis of the slide.
and engages a closed curved path of a motor-driven curved plate.

The curved plate is coupled to the motor shaft for exactly one revolution by a spring-loaded interlocking clutch and then disconnected. The five bending points at the ends of the coil are precisely formed during one revolution of the curved plate, and the curved plate is separated and stopped by the mating clutch of the motor shaft at the end of one revolution.

As previously mentioned, it is an important aspect of the present invention that by forming suitable bend points at the coil ends of a coil spring, the coil spring can be positioned (aligned) very accurately at a subsequent spring alignment station. This is a great effect.

Further, according to a preferred embodiment of the present invention, the spring alignment station has two swing alignment levers at least at the end portion of the coil, and alignment cams (alignment pieces) are provided at the front swing ends of the spring alignment levers. and each of these alignment cams engages one bend point of the coil end of the coil spring. Additionally, alignment cams engage diagonally opposed bend points on the ends of the coil. As a result, the coil end rotated and fixed by the alignment cam is gripped by the conveyor belt precisely at this position, and is conveyed by the conveyor belt to the assembly rail.

Hereinafter, the present invention will be described only with respect to one embodiment thereof.

The coil spring 10 shown in FIGS. 1 and 2 consists of a single piece of wire and has two open-ended coils 11 and two helical coils 15,16. The coil end portions 11 at both ends are bent in the same shape at a plurality of locations in opposite directions.

Viewed from the downward facing first helical coil 16, the device of the invention provides a first bending point 5 in a portion of the coil end 11, followed by a relatively short bent first side 13. It is being The first side 13 terminates at a second bending point 6 and is followed by a relatively long bent strap 18 which terminates at a third bending point 7.

Following the third inflection point 7 is a second side 12 which is opposite and parallel to the first side 13, but which is shorter than the first side 13. .
The second side 12 terminates at a fourth bending point 8, followed by a short second strap 18a.
There is. The longitudinal axis of the second strap 18a is oblique to the longitudinal axis of the first strap 18, and the second strap 18a terminates at a fifth bending point 9. Following the fifth bending point, the bending end 14
, with the bent end 14 being bent out of the plane of the drawing, angled, and directed upwardly.

FIG. 2 shows that the surface containing the two coil ends 11 is larger than the surface containing the adjacent helical coils 15,16. The end coils 11 can therefore press against the upholstery fabric over a relatively large area and can better transmit the pressing force diagonally and laterally to the helical coils 15, 16.

The bent end 14, which is always bent inward towards the spring axis 17, equalizes the different lengths of the spring during the manufacture of the coil spring 10.

As will be explained later, the provision of the first and third bending points 5,9 allows for precise alignment of the end coils 11 in the spring alignment station 200, thus providing a highly accurate spring. can be sent to the subsequent spring assembly machine. Such spring assembly machines are known in the art, for example from the German patent DE-
It is as described in PS1552150.

Feeding these springs to the spring core assembly machine is as per the German National Publication DE-
It is known as OS3101014.

All the contents described in the above-mentioned publications are included in the present application and constitute the present invention.

FIG. 3a shows a bending station 17 according to the invention.
Spring 1 as described above using 8,179
1 schematically shows an apparatus for manufacturing 0;

Several gripping arms 182 to 185 are arranged on the periphery of a motor-driven rotary plate 181, distributed radially and at equal intervals. The free end of each gripping arm 182-185 is provided with a pawl 187 actuated by a gripping mechanism (not shown). Rotating plate 181 rotates in rotation direction 186 together with gripping arms 182-185. During its manufacture, the coil spring 10 is transferred from a spring coiling station 177 to a first bending station 178, gripped by pawls 187 and rotated in a rotational direction 186. At the first bending station, the coil end 11 is shown in FIG. 3b.
The central member 66 shown in FIG. Next, the slides shown in Figures 4 to 9 and Figures 10 to 14
The coil spring 10 is driven by the drive device shown in the figure.
The above-mentioned five bending points 5 to 9 are formed in the first end coil 11 of. The gripping arm 183 is then moved in a series of steps in the direction of rotation 186 so that the opposite coil end 11 of the coil spring 10 enters the area of the second bending station 179, where this end coil is given five bends. points 5-9
is formed. After the rotating plate 181 further rotates in the rotational direction 186, the completed coil spring 10
is known as spring heating (quenching), (glowing)
transferred between the holding electrodes of station 180;
Here, the stress generated during cold deformation is compensated (removed) at a temperature of approximately 300°C. Here, the spring is slightly twisted. Therefore, the spring heating (quenching) station 18
It is impossible to immediately transfer the coil spring 10 that has left the coil spring 10 to an assembly machine. Therefore, the spring heating station 180 is followed by the spring alignment station 2 shown in FIGS. 15-18.
00 is provided, and in this spring matching station 200, the coil spring 10
The bending point formed in the coil end 11 of the coil spring 10 and located in the area of the conveyor belt 207 allows precise alignment of the coil spring 10. The completed springs are then sequentially fed into the transfer channel of conveyor belt 207 and transferred to a spring core assembly machine.

FIG. 3b schematically shows a portion of FIG. 4, namely the cooperation between the individual bending tools and the central member 66.
The coil ends 11 to form the five bend points are arranged on the outer periphery of the central member 66 and spaced radially from the central member 66 . This is done by gripping arms 182-185 with claws 187 shown in FIG. 3a.

The first bending point 5 is formed by a bending tool 78 having two protrusions separated by a recess 167 . One of the protrusions mentioned above is formed as a slope 168 parallel to the cooperating surface of the central member 66.

The recess 167 is approximately U-shaped and has one of the protrusions on one side and the protrusion 166 on the other side.
is provided. The first bending point 5 is thus formed by pressing and bending the coil end 11 onto the protrusion 100 of the central member 66.

The second bending point 6 is formed by a bending tool 70. The bending tool 70 is displaceable in the direction of its longitudinal axis. That is, it is movable in a radial direction relative to the central member 66. This bending tool has a protrusion 71 and a head 73 on both sides of a central recess 76. A recess in the central member 66 faces this head 73. The protrusion 71 and the head 73 of the radially movable bending tool 70 engage in cooperating recesses of the central member 66 , the bending point 6 interlocking with the protrusion 77 of the central member 66 .
is formed by arranging the coil end portion 11 with respect to the coil end portion 11.

Before the bending tool begins its work, the head 176 of the pushing device 23 engages the recess 80 in the central member 66, holding the end coil 11 of the coil spring 10 firmly under the head of the pushing device 23. do. After the coil ends 11 are thus secured to the central member 66, the bending tool is successively pushed forward relative to the central member. However, the bending tool 7
8 marks the first bending point 5, a bending tool 70 marks the second bending point 6, and a wedge-shaped bending tool 64 marks the third bending point 7.
form each.

The fourth bending point 8 is formed by a bending tool 87. This bending tool together with another bending tool 79 is displaced radially inward towards the center of the central member 66 .

The bending tool 87 has two parallel edges 174, 174 of the same level separated by a recess 175. The bending points 8 are formed by respectively moving the edges 174 into corresponding recesses in the central member 66. That is, the end coils are bent on the protrusion 173 of the central member 66.

The bending tool 79 is pushed forward simultaneously with the bending tool 87, pressing the remaining free end of the coil end 11 against the surface of the bending tool 169, which is shaped like an inclined spattle. The bending tool 169, unlike the various bending tools described above, is movable upwardly and perpendicularly to the plane of the drawing of FIG.
4 can be formed. The bending tool 169 is mounted on a stationary support 170.

The head 171 of the bending tool 169 is connected to the bending tool 16
The wire set on the surface 9 enters the recess 172 of the central member 66 so that it is securely gripped from below.

The bending tool and slide are shown in more detail in FIGS. 4-9.

The pushing device 23 of FIGS. 4 and 5 is movable in the direction of its longitudinal axis.

The movement of the pushing device 23 in the longitudinal axis direction is controlled by the lever 2.
and bolts 24 on the back. The lever 2 extends through the tool plate 3 in the region of the guide 21, and the bolt 24 has a control roller 26 which engages in the curved path of a motor-driven rotating curved plate 19.

In the upper part of FIG. 5, the bent end 14 is connected to the coil end 11.
It is shown that the slide 1 is connected to a bending tool 169 (FIG. 3b) which forms a bending tool 169 (FIG. 3b). In FIG. 4 this slide 1 performs an oblique movement perpendicular to the plane of the drawing, and in FIG. 5 it moves in the direction of the arrow 108. In this case, the pivot point is fixed by the bolt 48, so that the pivoting movement is effected by the force of the pressure spring 61. The pressure spring 61 is arranged between the abutment strap 31, which is fixed by the screw 40, and a high-tension pin 69 provided on the opposing rotating part.

Bending tool 169 and slide 1 arrow 108
The forward movement of the pivoting movement in the direction is effected by a cam 47 which is fixed to the slide 1 by means of a screw 41. The cam 47 has a lower wedge surface 51 with which the wedge surface of the cam 57 of the curved plate 19 cooperates.
When these two wedge surfaces meet, the cam 47 is lifted and the slide 1 is tilted about the axis 39 in the bolt 48.

This tilting movement is limited by a stop 30;
A high-tension pin 68 cooperates with this stop 30 in the region of the guide plate 32 .

Each bending tool 64, 70, 78, 87, 169 is connected to an associated slide 1, 35, 45, 55, each slide gripping a tool plate 3 and lowering a bolt 36 with a rotatable roller 38. Have it on the side. The bolt 36 is fixed by a pin 54. A similar arrangement is provided by bolt 37 on the opposite slide in FIG. According to FIGS. 7 and 4, the slide can be adjusted in its longitudinal displacement towards the central part, and the lateral adjustment can be effected by using a screw 49 arranged in the corresponding lateral guide block in the lateral direction. This is done by adjusting the The tool plate consists of two parts, a hard intermediate plate 29 is fixed on the relatively soft tool plate 3 by fixing screws 46, and on the intermediate plate 29 there are guides 27 for different slides. It is provided. The guide 27 has opposed guide grooves 60, which are provided with lubricating grooves 59, in which the slide is guided and displaced in the longitudinal direction (see FIG. 8).

A more important point in FIG. 8 is that the guide 27 is
4 to the tool plate 3, and on the opposite side is formed by a guide block 63 which is adjustable by two distance adjustment screws 49 passing through corresponding nuts 58. be. With this configuration, slide 35
itself allows for indirect regulation of

In FIG. 7, a roller 38 is provided below the flange of the bolt 37, which engages with a corresponding guide of the curved plate 19.

The guide 21 (FIG. 9) consists of a plastic plate fixed to the tool plate by screws 42.

Furthermore, as shown in FIGS. 4 and 5, the mounting plate 4 on the tool plate 3 accommodates a central member 66.

With reference to FIG.
a tension spring 62 acting on the outer free end of 3 and having the other end coupled to a housing (not shown);
caused by

10 to 14 show details of the drive device for the curved plate 19. The drive device must have the following basic functions:

The curved plate 19 must be rotated exactly once,
It must be stopped after one revolution.

Furthermore, there must be an overload coupling between the drive and the curved plate 19 in order to disconnect the curved plate from the drive motor when an unacceptable force is applied to the curved plate 19.

10 and 12 show that the curved plate 19 has an internal curved path 16 formed as an upwardly open groove.
3 and a curved path extending along the outer periphery of the curved plate 19.

FIG. 10 shows a curved plate 1 having an eccentric outer periphery.
9 is firmly coupled to the eccentric shaft 112, and the eccentric shaft 11
2 stops at the flange part of the eccentric body 12
It is shown that it is connected to 5. The operation of the stop eccentric 125 will be explained in detail later with reference to FIG. 14.

The eccentric shaft 112 has two spaced apart bushes 1
Housing 10 of the drive device by 53,155
9 is rotatably supported.

Eccentric shaft 112 is driven by an occlusal clutch 154 consisting of two opposed tooth members 94, 97 which rotate together when engaged. The bush belonging to the upper tooth member 94 is loaded by a pressure spring 95 and is pressed against the lower tooth member 97 when the bite clutch 154 is engaged.

The outer periphery of the articulating clutch 154 is provided with external teeth which engage a corresponding gear 89 which is rigidly connected to the shaft 122. The shaft 122 is also connected to the housing 10 by bushings 147, 148.
9 is rotatably supported.

The shaft 122 is driven by a further gear 119. However, this gear 119 is not firmly connected to the shaft 122. Gear 119 on shaft 122
An overload clutch, which will be described later, is provided between the motor shaft 84 and a pinion 129 fixed to the motor shaft 84. A plurality of tightening screws are distributed around the outer circumference of the gear 119 and engage with the corresponding clutch ring 110 . This clutch ring 110 is connected to a tightening screw. clutch ring 110
is rotatably supported by a needle bearing 92 to a hub 96 fixed to the shaft 122 by a wedge.

A second clutch ring 102 is provided opposite and coaxially with the clutch ring 110, and this second clutch ring 102 is moved by a spring-loaded roller 91 to the first clutch ring 110. is combined with The first clutch ring 110 is supported against a flange 121 fixed to the housing by an axially loaded spacer plate 132.

The roller 91 of the clutch ring 102 rolls in a U-shaped annular groove 93, and thus the roller 93 is pushed into the first clutch ring 110 by the force of the leaf spring 88.
pressed against. At this time, the upper end of the leaf spring 88 contacts the lower side of the clutch ring 102, and the lower end contacts the flange 82 fixed to the housing. In this regard, the hub 96 is secured to the end of the shaft 122 by a tightening screw 90.

For example, if the torque of the shaft 122 becomes too large due to an overload on the curved plate 19, the roller 9
1 is removed from the annular groove, and the leaf spring 88 is compressed.

This causes the clutch ring 102 to move downward in the axial direction. On the other hand, a contact switch (not shown) is provided near the reference numeral 85.
This stops the electric motor of the drive.

The electric motor drive shaft rotates a motor shaft 84 supported by two ball bearings spaced apart from each other by a ring 140 . The lower ball bearing is supported by a spacer ring 137 against a clutch ring 99 of another clutch. This clutch has an elastic element and transmits force through total friction. Elements 98 engage corresponding passages in an annular groove of clutch 139 which is supported axially relative to housing 109 by spacer ring 138. This part is Clutch Bell 1
11 and is covered by the housing 10
An electric motor was attached to the bottom of 9 (not shown).
A motor plate 114 is provided.

Next, the engagement and disengagement of the bite clutch 154 will be explained with reference to FIGS. 12 and 13.

The engagement of the bite clutch 154 is caused by the cylinder 11
This is done by introducing compressed air into 5.
The cylinder 115 moves the clutch lever 118 (its center of motion is at the bolt 128) toward a stop in the housing as shown by the dash-dotted line.

This pivoting of clutch lever 118 takes place against the force of spring 81. Clutch lever 118 is coupled to a control arm 116 located on the outer periphery of tooth member 94 of articulating clutch 154. Thus, when the clutch lever 118 pivots as shown in dash-dotted lines, the control arm 116 moves away from the tooth member 94 and the articulating clutch 154 is engaged by the sleeve 146 under the force of the pressure spring 95. Two tooth members 94, 97 can be engaged.

In order to stop the curved plate 19 after exactly one rotation, a stopping device is provided, which will be described below with reference to FIGS. 11 and 14.

In addition to the above-mentioned cylinder 115 for engaging the occlusal clutch 154, another cylinder 11 is provided.
7 is provided. The cylinders are controlled by the same valve so that the two cylinders 115, 117 are operated simultaneously. Referring to Figure 11,
Cylinder 117 actuates stop lever 106;
Stop lever 106 rotates about its pivot axis 126. The pivot shaft 126 consists of a bolt supported by the base 101 forming part of the housing 109.

The clockwise pivoting movement of the stop lever 106 by the cylinder 117 takes place against the force of the screw pressure spring 105 acting on the counterbalancing cam 104 of the stop lever 106 . The swinging free end of the stop lever 106 is now disengaged from the stop eccentric 125 and the curved plate 19 can thus make exactly one revolution.

After pivoting the stop lever 106, the stop lever 1
A roller 135 provided at 06 moves along the outer periphery of the stop eccentric 125. After one complete revolution has been completed, i.e. shortly before its completion, the stop lever 106
The curved portion 12 is controlled by the force of the screw pressure spring 105.
Enter 7. The control curved portion 127 extends from the outer circumference of the disc-shaped stop eccentric body 125 toward the inner circumference.

Stop edge 1 at the opposite end of the control bend 127
61 is the corresponding control edge 162 of the stop lever 106
Acts as a stop for When it rotates once,
The control edge 162 of the stop lever 106 is the stop edge 161
hits the corresponding constraint surface. During this stroke, it may occur that the curved plate 19 unexpectedly rotates in the opposite direction. To prevent this, a spring-loaded catch lever 144 is provided opposite the stop edge 161 to prevent the stop eccentric 125 and therefore the bending plate 19 from swinging in the opposite direction. There is. The capture lever 144 bites into the plate 164 and the stop edge 161
The stop edge 161 is thus locked by the stop lever 106 and the catch lever 144.

Since the control edge 162 of the stop lever 106 is a vulkollan plate 134, this stop takes place gently.

FIG. 14 shows the same situation as described above, but the stop lever 106 is shown in section and the stop eccentric 125 is connected to the large diameter plate 1.
64, and a control curved portion 127 is provided on its outer periphery. The roller 135 of the stop lever 106 moves along the outer circumference of the plate 164 until it reaches the control bend 127. Stop lever 106 is rotatably supported by bolt 149. Contact with the stop eccentric 125 is produced by a locking block 131 supported on the stop lever 106 by a Valcolan plate 133.

The pivot bearing of the stop lever 106 is the base 1
01 is provided by a bolt 151 fixed to the bolt 151.

12 and 13, manual and automatic disengagement of the occlusal clutch 154 will be described.

As shown in FIG.
is a balancing cam 165 with a wedge-shaped increasing slope.
, and on this ramp a corresponding ramp of a cam 142 connected to the bush 146 rides up, thus raising the bush 146 in the direction of arrow 103 and separating the tooth members 94, 97. Balance cam 16
5 is moved past the cam 142 by the still rotating curved plate 19, which causes the cam 142 to descend downwards in the direction opposite to the arrow 103, allowing the clutch to make the next rotation. become a state.

At this time, control air has been extracted from the cylinder 115 at an appropriate time to prevent the engagement clutch 154 from re-engaging.
This causes the piston to return to its rest position, and the clutch lever 118 assumes the position shown in solid line in FIG. Thus, control arm 116 engages and stops tooth member 94.

The occlusal clutch 1 is operated by the release lever 107.
54 can be separated but not engaged. The separation lever 107 is connected to the housing 10
It is rotatably supported by a bearing 156 provided at the pressure spring 9, and its inclined front end
5 engages the toothed portion of the bushing 146 which can be displaced against the force of 5.

As shown in FIG. 10, the pressure spring 95 is supported at its upper end by a spring plate 145 which transmits its axial force to the bush 155. Bush 155 is supported by bearings 124 in the housing.

The stop for the stop lever 106 is the housing 10
9 is provided on an angle member 150 provided at the front end of the main body. When the cylinder 117 is actuated, the cover 130 of the stop lever 106 hits a stop with a rubber element.

An advantage of the drive shown in FIGS. 10 to 14 is that all slides and tools of the bending device can be operated by the same drive. It is thus cheaper and easier to manufacture than one with four separate drives, and there is no problem of synchronizing the four separate drives.

One coil end 11 of the coil spring 10
The entire structure of the bending device that forms five bending points is shown in the fourth section.
The above description has been made with reference to FIGS. 14 to 14.

As shown in FIG. 3a, the first bending station 178 is followed by a second similar bending station 179. At the second bending station 179, the coil spring 1
The above-mentioned five bending points are formed on the other end coil 11 of 0. Second bending station 179
The details are exactly the same as the first bending station 178.

As shown in FIG. It is brought into contact between the holding electrodes. Here coil spring 10
is heated to approximately 300℃ to equalize the tension caused by cold deformation. At this time, the coil spring is slightly deformed. That is, it is twisted and its length changes. As a result, the completed and hardened coil spring 10 is loaded onto the subsequent conveyor belt by the gripping arm 185 but is not precisely aligned.

As mentioned above, a conveyor device is disclosed in German Publication No. DE-OS 3101014. Similar to that described therein, the coil springs are laid on a conveyor 207 consisting of two opposed and synchronously driven conveyor belts.

A spring alignment station 200 disposed on a portion of a conveyor belt will now be described with reference to FIGS. 15-18. At this station, the coil spring 10 is accurately aligned using the five bending points formed in the bending station according to the invention.

FIG. 15 shows one half of conveyor belt 207, the belt running in the direction of arrow 208. FIG. The coil spring 10 is shown with only one end coil 11 being wound around the spring matching station of FIGS. 15 and 16, and the other coil end 11 being wrapped around the spring matching station of FIGS. 17 and 18. Wound at alignment station.

Alignment of the coil springs is accomplished by providing the housing of the device with a stationary slide that rotates about an axis 211. Axis 211 is arranged perpendicular to the plane of the drawing. This rotation is effected by a compressed air cylinder 212, the piston rod 213 of which is connected to the projecting arm 21 of a control lever 216 rotatably supported on the shaft 211.
5 through the rubber element 214.

An alignment lever 218 is fixed to the opposite end of the control lever 216 by a tightening screw 217, and an alignment cam (alignment piece) 219 is provided at the lower free end of the alignment lever. As shown in FIG. 15, the alignment cam 219 engages the bending point 7 of the coil spring 10, which acts as a center of rotation and a fixed point for alignment.

A second alignment lever 221 is provided opposite the alignment lever 218, and the second alignment lever 22
1 also has an alignment cam (alignment piece) 222. This alignment lever 221 is supported by a pivot shaft 224 provided in the housing of the device and is located at position 221'.
223 in the direction of the arrow 223.

When the alignment lever 221 is pivoted in the direction of arrow 223, the lower end of the coil spring is in position 1 as shown.
0', alignment cam 222 engages bending point 5. The alignment cams 219, 222 engage diametrically opposed bending points 5, 7, resulting in stable linearity of the coil spring, which
is rotated precisely so that it is always on top.

The pivoting of the lower alignment arm 221 is effected by a compressed air cylinder 226, whose piston rod 227 is connected to a hinge piece 228 and a pivot bolt 22.
It is pivotally connected to the alignment lever 221 via 9.
When the piston rod 227 is displaced, the alignment lever 2
21 can be moved in the direction of arrow 223 to position 221'.

Left and right stops 248, 249 are provided to limit the final position of alignment lever 221. In the illustrated embodiment, a further compressed air cylinder 230
is provided, the piston rod of which pushes the alignment lever 221 outward. Since the alignment lever 221 is formed of a leaf spring, its alignment cam 222
leaves the end coil 11 of the coil spring 10.

Furthermore, in other embodiments not shown, the alignment lever 221 is formed as a rigid element rather than a leaf spring, which rigid element rotates in the direction of arrow 232 and in the opposite direction in a pivot bearing fixed to the housing of the device. It is adapted to be able to pivot in any direction.

17 and 18, the opposite spring alignment station 200 is shown, where the illustrated alignment device allows the coil spring 10 to be
The matching of the end coil 11 on the reaction side is performed.

As shown in FIGS. 17 and 18, the control slide 233 is adapted to rotate in a direction perpendicular to the plane of FIG. The control slide 233 is located at the bending point 6 of the coil end 11 of the spring coil 10.
It has a control cam (control piece) 234 that engages with.
The pivoting of the coil spring 10 into position 10' (the center of pivoting being in the area of the bending point 6 around the control cam 234) is effected by the control slide 236. The control slide 236 is displaceable downwardly in the direction of arrow 240 in FIG. 18 and has a lower control cam 237. This control cam 237 hits the coil spring at the strap of the coil end 11 of the coil spring and moves the coil spring to position 10' at arrow 235.
Rotate in the direction of

The control slide 236 is driven by a compressed air cylinder 238 via a piston rod 239 and is adapted to be vertically displaceable as shown in FIG.

Importantly, the control cam 237 contacts the coil end 11 of the coil spring only on the outside;
This causes the coil to have a twisted air around the control cam 234.

One alignment station shown in FIGS. 15 and 16 and the other alignment station shown in FIGS. 17 and 18 are driven synchronously, so that the end coils 11 of the coil spring 10 are aligned simultaneously.

After alignment has taken place, the control cams 219,
222, 234, 237 or alignment cam 219, 2
22, 234, 237 are disengaged from the corresponding coil end 11 of the coil spring by means of cooperating control bars. The springs thus aligned are conveyed by conveyor belt 207 in the direction of arrow 208 to a transfer unit and from there to a spring core assembly machine. control slide 2
It should be noted that 33 is driven by a compressed air cylinder 241, which is shown in side view in FIG. 18 and in plan view in FIG.

The formation of bending points on the two end coils of the coil spring is carried out by a relatively simple bending machine during the manufacture of the coil spring, and the formed bending points are used to form the coils for feeding into a subsequent assembly machine. It is also a feature of the invention that it is simultaneously utilized for precise alignment of the springs.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of a coil spring with a coil end bent by the device of the invention, and FIG. 2 is a perspective view of the coil spring of FIG. 1 in the direction of the arrow. 3a is a schematic front view of the device of the invention; FIG. 3b is a top view of the central member of the bending station with radially arranged bending tools; FIG. 4 is an overall front view of the bending station according to the present invention, FIGS. 5, 6, 7, and 8.
The figures are lines B-B, D-D, and A- in Figure 4, respectively.
9 is a view taken in the direction of arrow E in FIG. 5, and FIG. 10 is a longitudinal section of a drive device for a curved plate for driving a bending tool in the radial direction. 11 is a sectional view of the control device for controlling the occlusal clutch, FIG. 12 is a side view of the drive device of FIG. 10, FIG. 13 is a diagram showing another control device for the occlusal clutch, and FIG. 11; FIG. 15 is a schematic side view of the spring alignment station for one coil end of the coil spring; FIG. 16 is a front view of FIG. 15; 17 is a plan view of the spring alignment station of FIG. 18, and FIG. 18 is a side view of the spring alignment station for the opposite coil end of the spring coil. In the figure, 10 is a coil spring, 11 is a coil end, 5 is a first bending point, 16 is a second bending point, 7 is a third bending point, 8 is a fourth bending point, 9
is the fifth bending point, 12 is the second side, 13 is the first side, 14 is the bending end, 16 is the helical coil, 17
is the spring axis, 18 is the first strap, 1
8a is a second strap, 3 is a tool plate, 19 is a curved plate, 163 is a curved path, 1, 34, 35, 55 are slides, 37, 38 are rotating rollers, 23 is a pushing device, 176 is a pushing device. Head, 66 is a central member, 64, 70, 78, 87 are bending tools, 1
82 to 185 are gripping arms, 187 are front claws, 1
86 is the rotational direction of the gripping arm, 177 is a spring coiling station, 178 is a first bending station, 179 is a second bending station, 180 is a heating (quenching) station, 15
4 is an interlocking clutch, 84 is a motor shaft, 200 is an alignment station, 207 is a conveyor belt,
218, 221 are swing alignment levers, 219, 22
2 is a matching cam.

Claims (1)

[Claims] 1. A device for manufacturing a coil spring made of wire and having coil ends at both ends bent in the same shape at a plurality of locations in opposite directions, each coil spring 10 having a gripping arm that is rotationally driven. 182-185 front claw 18
7, the gripping arm is configured to transfer the coil spring 10 being manufactured to a series of work stations arranged sequentially according to the direction of rotation 186 of the gripping arm; A first bending station 178 is provided for bending one coil end 11 of the coil spring 10 into a substantially U-shape at a plurality of mutually spaced bending points, and following the first bending station 178, A similar second bending station 179 is provided for forming the opposite coil end 11 of the coil spring 10, followed by a quenching station 180, which is connected to the first and second bending stations. The central member 66 is fixedly arranged at the center of the tool plate 3 and has a cooperating surface for bending on the circumferential side, and the central member 6
6 and the central member 66 .
A coil spring manufacturing apparatus comprising a plurality of bending tools 64, 70, 78, and 87 for bending coil ends movable toward.