JPH0154141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to an automatic tension spring manufacturing device, in which the axial center of the coil is fixed once from the coil section as indicated by the inverted round hook in JIF B 0103 (1982). For example, a device that can only be used with an English-style hook, which is bent diametrically so as to intersect with the coil axis, then bent 90 degrees parallel to the axis of the coil, and then raised.
-6714 or Japanese Patent Publication No. 52-11306, when manufacturing tension springs, the hooks are as shown in JIS B 0103 (1982) as semicircular hooks and round hooks. This invention relates to a method for forming a dokutsu-style hook that is bent directly from the coil part by 90 degrees parallel to the coil axis.

Prior art The Rocker arm type which is conventionally known as a spring manufacturing device is disclosed in Japanese Patent Publication No. 37-6714 and Special Publication No. 52-
There is No. 11306. This is a rocker arm end where the wire held between two feed rollers is sent out from the hole in the guide and is regulated and swung by a cam about an axis perpendicular to the wire at a position offset from the center of the guide. When the forming tool advances to the front side of the fed wire rod, for example, it curves the first hook part, body part, and second hook part of a tension spring with hooks at both ends. By feeding the wire rod and driving it intermittently, the same process was repeated to manufacture springs one after another. This type of tension spring with a hook could only be manufactured in the English style.

Problems to be Solved by the Invention: In the rocker arm type device in which the forming tool does not move much, it is possible to obtain a method for forming a single-type hook in the production of tension springs by minimizing the number of additional elements and processes and using a simple structure. It is.

Means for Solving the Problem A rocker arm 48 swings in front of the wire guide 43 held between the feed rollers 15 and 19.
In an automatic tension spring manufacturing apparatus that sequentially forms the coils of the first hook and body portion by abutting the wire rods by advancing a forming tool 50 attached to the On the other hand, after forming the first hook or the straight part following the first hook, feeding of the wire is temporarily stopped at 1/4 of the first turn of forming the body coil, and the wire rod is not deviated from the coil forming surface. The third forming tool 53, the receiving tool 53, and the receiving tool 5 are twisted so as to twist the wire to a position opposite to the side where the coil is to be formed.
4 to clamp the winding start position of the coil, and using this clamping point as a bending point, the first forming tool 47 forms the first hook or the straight part following the first hook at an angle of 90 degrees or more toward the coil forming side. In this method, the wire is bent, and then the second forming tool is advanced and the wire is fed, followed by forming the coil of the body part.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. First, in FIG. 2, the camshaft driven by the motor 1 has three cams in this example: a first cam 4 for driving the first forming tool, a second cam 5 for driving the second forming tool, and a third cam for driving the second forming tool. The third cam 6 for driving the three forming tools are arranged in parallel and fixed at fixed angles so that the respective action timings are as shown in FIG. One end of the feed cam 3 is formed into a sector gear 7, and a lever 9 with a sector gear that can swing on a support shaft 8 is in contact with a cam follower 10, which is prevented from separating by a spring (not shown). The sector gear 7 meshes with the gear 12 of the one-way clutch 11, and rotation in only one direction is transmitted to the camshaft 13 and gear 14. The gear 14 meshes with a gear 17 fixed to a roller shaft 16 of a wire feeding roller 15. A gear 18 is fixed to the feed roller shaft 16, and is fixed to the roller shaft 20 of a pair of feed rollers 19 and meshes with a gear 21 having the same number of teeth as the gear 18. It is rotated in the opposite direction, and the wire is fed out while being held by its outer circumferential V surface. In contrast to the above-mentioned transmission system using the cam for feeding the wire, the transmission system using a servomotor is used for feeding the wire, especially during coil forming of the body portion. That is, a pulley 23 fixed to the output shaft of the servo motor 22 is connected to a pulley 25 of the one-way clutch 24 by a timing belt 26, and the clutch shaft 2 of the one-way clutch 24 is connected to the pulley 25 of the one-way clutch 24 by a timing belt 26.
A gear 28 fixed to the roller shaft 16 of the feed roller 15 meshes with a gear 29 fixed to the roller shaft 16 of the feed roller 15. An encoder 30 that detects the rotation of the servo motor 22, that is, the amount of feed during coil forming of the body part, is connected by meshing between a gear 31 on the output shaft of the servo motor 22 and a gear 32 on the input shaft of the encoder 30. .

Further, an encoder 33 for detecting the rotation of the feed roller 15, that is, the total feed amount of the wire rod, is connected to a pulley 34 fixed to the clutch shaft 27 and a pulley 35 on the input shaft of the encoder 33 by a timing belt 36.

Next, the arrangement of the forming tools will be explained with reference to FIG. On the board 41 on the front side of the machine frame containing the above-mentioned wire rod feed drive mechanism, there is a guide tool 43 having a feeding hole 42 coaxial with the center line of the wire held between the feed rollers 15 and 19 and whose axial position can be adjusted. possible and prominently mounted. A first rocker arm 45 is attached to a support shaft 44 in a right angle direction shifted from the center of this guide tool 43.
is rotatably supported almost at the center,
A tool holder 46 is fixed to the tip in parallel with the support shaft 44, and the top surface of the tool is at a position where the tip of the tool holder 46 is lowered by approximately the radius of the body coil of the spring from the feeding hole 42 of the guide tool 43. A first forming tool 47 having an acute-angled tip is attached to. The second rocker arm 48 is the first rocker arm 45
The second forming tool 50 at the tip of the tool holder 49 has an inclined surface facing the feeding hole 42, and a forming groove whose center coincides with the center line of the feeding hole has an inclined surface. formed on top. Further, the third rocker arm 51 is parallel to the first rocker arm 45, and the tool holder 52 and the third forming tool 53 are in opposite positions. It is located above the hole 42 side, and the tip is formed at an acute angle with a small radius. Furthermore, a receiving tool 54 is fixed to the substrate 41, which has a tip in the fourth quadrant position slightly below the feeding hole 42 from the diagonal right direction between the first and second forming tools, and which holds the wire between the third tool and the third tool. has been done.

Next, the relationship between the rocker arm and the drive cam will be explained with reference to FIG. 3, which shows the case of the second forming tool 50. A cam follower 61 that contacts the second cam 5 fixed to the camshaft 2 is rotatably supported by a cam lever 63 that is pivotally supported by a shaft 62, and this cam lever 63 is rotatably supported by a push lever 65 that is rotatably supported by a shaft 64. They are connected by a connecting member 66. The tip of the push lever 65 is pivotally connected to a connecting rod 67 by a pin, and the tip of the connecting rod 67 is pivotally connected to an intermediate lever 68 by a pin. The other end of the intermediate lever 68 is the second
Connecting rod 6 pivotally connected to the tail end of the Rotzker arm 48
The tail end of the rocker arm 48 is pulled by a tension spring 70 attached to the machine frame, so that the cam follower 61 is always in close contact with the second cam 5. The second forming tool 50 moves in a circular arc by the rotation of the second rocker arm 48 driven by the second cam, and is related so that the forming groove advances to the front surface of the feeding hole 42 at an approximate linear movement position at the apex thereof. ing. Similarly, the first rocker arm 45 and the third rocker arm 51 take their operating positions at substantially linear movement positions when driven by their respective cams. After forming the first 1/4 of the coil of the body portion, which will be described later, the third forming tool 53 is advanced to a position where the coil winding start position is pressed and held by the receiving tool 54 from the coil forming surface by twisting within the fourth quadrant. First forming tool 47
is advanced to two positions below the receiving tool 54, below the third forming tool 53, and in front of the coil forming surface.

Function The spring forming process will be explained with reference to FIG. 9. Feed cam 3, first cam 4, second cam 5, third cam
The cam 6 is rotated at the same time as the rotation of the motor 1 is transmitted at a reduced speed, and the lever 9 with a sector gear is rotated on the cam surface F of the feed cam 3, and the rotation of the gear 12 causes the gear 14 of the clutch shaft of the one-way clutch 11 to rotate. The gear 17 is rotated, and the roller shafts 16 and 20 are rotated in opposite directions by the gears 18 and 21.
The wire rod clamped by the rotations 5 and 19 is sent out at a predetermined speed to create the straight section A at the tip of the first hook 1 in the process drawing 9. On the other hand, the second cam 5 is slightly delayed and rotates the second rocker arm 48 by turning to 2A without lift, and the second forming tool 50 advances to the front of the feeding hole 42 and collides with the wire, as shown in the process diagram 9. Step 2: Form the semicircular arc of the first hook. When the lift of the second cam 5 is small (2), the second forming tool 50 is moved backward, separated from the wire, and the wire is moved straight to form a straight portion (c) following the first hook of 3 in process diagram 9. When the second cam 5 is not lifted, the second forming tool 50 moves forward and abuts the wire, forming 1/4 of one turn of the first coil of the body part 4 in process diagram 9, and forming the wire. Directing downward, the second cam 5 is located at 2N, and the second forming tool 50 is immediately retracted, and the feed cam 3 is also set to F, and the sector geared lever 9 is reversed. This rotation slips in the one-way clutch 11, is not transmitted to the feed rollers 15 and 19, and feed of the wire is stopped. On the other hand, the third rocker arm 51 of the third cam 6 is rotated at the cam surface 3R, which has no lift from 3A, and the third forming tool 53 advances and comes into contact with the coil winding start point of 5 in the process drawing 9, thereby forming the wire rod. Twist it to the right from the coil forming surface and clamp it with the receiving tool 54 at the fourth quadrant position. Furthermore, the first cam 4 is positioned a little behind the cam surface 1R, which has no lift, due to rotation from 1A,
The first rocker arm 45 is rotated, and the first forming tool 47 advances to push the straight section C following the first hook, which is below the clamping point A of the coil 6 in the process diagram 9 by the wire diameter, to the left in the diagram. Bend it at an angle of 90° or more along the lower surface of the third forming tool 53. The first cam 4 is located at the 1st position where the lift is smaller, and the first forming tool 47 is slightly retracted from the coil forming surface, and the third cam 6 is positioned at the 3rd position at the 3rd position, and the third forming tool 53 is moved back at the position 7 in the process diagram 9. becomes. In this state, the wire of the 1/4 turn coil is fed out and is strongly held between the rollers 15 and 19, so it returns to the coil forming surface due to the restoring force of the twist beyond that point, and the straight portion of the first hook is moved by the spring back. It opens at a right angle and faces directly to the side of the guide tool 43. The second cam 5 rotates and the second forming tool 50 advances on the non-lifting cam surface 2H, and the feeding cam 3 becomes the cam surface F, feeding out the wire, making it collide with the forming groove of the second forming tool 50, and forming the body. The coil is formed toward the side of the guide tool 43.
The first one to several turns of this coil are corrected by coming into contact with the flank of the wire at the end of the first forming tool 47 located on the way out so that there is no gap between the coils. (This operation is not necessarily necessary) While the feed cam 3 is feeding out the wire, the servo motor 22 is
rotates, and the one-way clutch 2 is released from the pulleys 23 and 25.
Rotation is transmitted to 4. Rotation of the sector geared lever 9 by the cam surface F of the feed cam 3 is caused by the rotation of the roller shaft 16.
The clutch shaft 27 is rotated in the same direction as the rotation of the servo motor 22 increases, and the rotation of the clutch shaft 27 is transmitted to the clutch shaft 27 by the gears 29 and 28. The rotation is transmitted to the roller shafts 16, 20 via the gears 28, 29, and the wire is fed out at high speed due to the fast rotation of the feed rollers 15, 19.
Form the coil ho of the body part. During this time, the clutch shaft 13 of the one-way clutch 11 is slipping. Cam F of feed cam 3 is servo motor 2
When the wire rod 2 is rotated and the wire is fed out from this feed, it is soon located at F2 where there is no lift, and the rotation by the feed cam 3 is stopped. Note that the position of the tip of the receiving tool 54 and the amount of twisting of the coil due to the advance of the third forming tool 53 are determined experimentally for the coil to be manufactured.

Effects As described in detail above, the present invention uses a Rocker arm type spring manufacturing device to form a single-type hook for a tension spring. During the process, feeding of the wire is temporarily stopped, and the coil winding is started at a twisted position. By clamping the wire and bending the hook side at an angle of 90 degrees or more, it is possible to create a German-style hook that bends at an angle of 90 degrees from the coil due to the restoring force of the twist of the wire and the spring back. By simply attaching a tool to a device that could previously only be manufactured, there is an effect that the increase in cost is small and the device can be manufactured without significantly increasing the number of steps, and the specifications of the device can be increased.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relative positions of the rocker arm, forming tool, and receiving tool of the present invention, Figure 2 is a feed roller drive system diagram, Figure 3 is a drive diagram of the rocker arm, Figure 4 is a feed cam diagram, and Figure 5 is a diagram showing the rocker arm drive system. The figure is a diagram of the first cam, Figure 6 is a diagram of the second cam, Figure 7 is a diagram of the third cam, and Figure 8 is a diagram of the feeding cam during tension spring forming.
FIG. 9 is a diagram showing the timing of the forming tool, the first forming tool, and the third forming tool. FIG. 9 is a process diagram from the first hook of the tension spring to the coil of the body. 3...Feeding cam, 4...First cam, 5...Second cam
Cam, 6... Third cam, 9... Lever with sector gear, 11, 24... One-way clutch, 22... Servo motor, 15, 19... Feed roller, 45...
...First rocker arm, 48... Second rocker arm, 51... Third rocker arm, 43... Guide tool, 42... Feeding hole, 47... First forming tool,
50... second forming tool, 53... third forming tool,
54...Receiving tool.

Claims (1)

[Claims] 1 A forming tool at the end of the rocker arm, which is regulated and oscillated about an axis perpendicular to the wire rod held by the feed rollers and sent out from the guide tool at a position offset from the center of the guide tool, forms the wire rod that is fed out from the guide tool. An automatic spring manufacturing device that sequentially forms the first hook part, the body part made of a coil, and the second hook part of a tension spring with hooks at both ends when it advances to the front side, and forms the spring by the cooperation of other necessary tools. After the first hook or the straight part following the first hook is formed, the feed of the wire is temporarily stopped when the second forming tool advances to form approximately 1/4 of the first turn of the coil in the body part. The coil is stopped, and the position at which the coil begins to wind is shifted from the forming surface of the coil by the advancement of the third forming tool, and the wire is twisted to a position opposite to the side where the coil is formed, and the fixed receiving tool is moved. The clamping point is placed on the side where the coil is to be formed by the advance of the first forming tool to form the first hook or the straight part following the first hook.
The coil is bent at an angle of 90° or more, and then the second forming tool is advanced and the wire is sent to continue forming the coil of the body part that is being formed,
The coil is characterized in that a desired single-piece hook bent approximately at right angles to the coil surface is formed by utilizing the torsional restoring force of the feed roller after the nipping point and the spring back after bending by 90 degrees or more. A method for forming tension spring hooks.