JPH0519156Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a torsion spring manufacturing device, specifically, a winding shaft, a drive motor that rotationally drives the winding shaft,
The present invention relates to a torsion spring manufacturing apparatus including a feeding means for feeding a wire onto the winding shaft and a movable blade for cutting the wire.

(Prior Art) Conventionally, this type of torsion spring manufacturing apparatus has, for example,
A winding shaft having a wire locking part and a winding surface on the outer periphery;
The storage drum comprises a drive motor that rotationally drives the winding shaft, a feeding means that feeds the wire wound and stored on the storage drum to the winding shaft via a guide member, and a movable cutter that cuts the wire. The wire rod wound and housed on the drum is sent from the guide member to the winding shaft side by the feeding means, and the winding shaft is rotated by the drive motor while the wire rod is locked in the locking part of the winding shaft. A torsion spring having straight leg parts of a predetermined length on both sides of the coil part is formed by cutting the wire with a movable knife by cutting the wire rod with a moving knife. It is configured to form a

(Problems to be Solved by the Invention) However, when forming a torsion spring using the above-described conventional torsion spring manufacturing apparatus, there are problems such as winding irregularities caused by winding the wire around the storage drum, the thickness of the wire, the hardness of the wire, etc. If there are variations in the diameter of the coil part and the free angle of the torsion spring, the applied load of the torsion spring will vary when used with the angle between the legs of the torsion spring narrowed to a certain angle. This caused the problem of defective products.

An object of the present invention is to provide a torsion spring manufacturing apparatus that can make the acting load constant for a constant operating angle of the torsion spring.

(Means for Solving the Problem) Therefore, in order to achieve the above object, the present invention includes a winding shaft 4, a drive motor 5 for rotationally driving the winding shaft 4, and a guide for the winding shaft 4. In a torsion spring manufacturing apparatus comprising a feeding means 2 for feeding a wire rod through a section 3 and a movable cutter 7 for cutting the wire rod, the winding number detector 8 detects the number of turns of the wire rod by the winding shaft 4; A load detection sensor 9 is located between the winding shaft 4 and the guide part 3 and detects the load acting in the direction of deflection of the wire wound around the winding shaft 4, and a load acting immediately before the scheduled number of turns of the torsion spring. a load setting device 10 for setting the winding shaft 4, and a load setting device 10 for controlling the motor 5 to reverse the winding shaft 4 just before the scheduled number of turns of the wire rod, and a detection value output from the sensor 9 at the time of this control, and the setting device A control means 11 is provided which controls the final number of turns of the wire rod by the winding shaft 4 by comparing the set value of 10 with a set value of 10, thereby making the operating load of the torsion spring constant.

(Function) With the above configuration, the winding shaft 4 is moved by the drive motor 5.
After winding the wire rod by the winding shaft 4 until just before the scheduled number of turns, the motor 5 is driven in reverse to reverse the winding shaft 4 by a certain angle and then stopped;
The deflection load at the time of stopping is detected by the sensor 9, and the detection result output from the sensor 9 is compared with the setting value set in the setting device 8, and the wire A is changed to the data wire according to the comparison value. Based on the results, the final number of turns of the winding shaft 4 is controlled by the motor 5 to form a coil part, and then the movable cutter 7 is used to form the wire rod A. By cutting the coil, it is possible to form a torsion spring with a constant operating load, which has a coil section with a constant operating load and legs at both ends of the coil section.

(Example) FIGS. 1 and 2 show a torsion spring manufacturing apparatus according to the present invention. This torsion spring manufacturing apparatus has a storage drum 1 on one side of which a wire rod A is wound and accommodated, and the drum A holder 2 for wire rod A is placed in a lateral position of 1.
1 and a cam body 22 that presses and holds the wire A on the holding body 21;
A feeding means 2 consisting of a moving mechanism (not shown) for reciprocating in the direction of the arrow in the figure is provided, and the moving body 20
While the cam body 22 is configured to hold the wire A only when the wire A is moved in the feeding direction, a guide member 3 having a guide passage 31 for the wire A is provided in front of the moving body 20. On the front side of the guide member 3 in the wire feeding direction, a winding shaft 4 having a locking part 41 and a winding surface 42 for the wire material A on its outer periphery is rotated and shafted by a drive motor 5 capable of forward and reverse rotation and a moving mechanism 6. The movable blade 7 for cutting the wire is provided at the front end of the guide member 4 in the wire feeding direction.

In the embodiment shown in the figures, the end surface of the guide member 3 on the winding shaft side serves also as a fixed blade for the movable blade 7.

Therefore, in the torsion spring manufacturing apparatus configured as described above, there is a winding number detector 8 for detecting the number of windings of the wire material A around the winding shaft 4, and a winding number detector 8 located between the winding shaft 4 and the guide section 3; A load detection sensor 9 detects the load acting in the direction of deflection of the wire wound around the winding shaft 4, a load setting device 10 sets the applied load just before the scheduled number of turns of the torsion spring 15, and the winding shaft 4 is connected to the winding shaft 4. Immediately before the scheduled number of turns of the wire, the motor 5 is controlled to reverse the rotation, and the detection value output from the sensor 9 and the setting device 1 are controlled during this control.
A control means 11 is provided which controls the final number of turns of the wire A on the winding shaft 4 by comparing the set value with a set value of 0, thereby making the operating load of the torsion spring 15 constant.

Specifically, as shown in FIG. 2, a winding shaft 4 is provided with a driven gear 12 and a winding number detector 8 consisting of a pulse encoder for detecting the number of revolutions of the winding shaft 4, while the driving motor 5 is The control means 1
A servo motor controlled by an output signal from the servo motor 5 is used, and a drive gear 51 that meshes with the driven gear 12 is supported on the rotating shaft 50 of the servo motor 5.
1 and 12 to transmit rotational power to the winding shaft 4, and the winding shaft 4 is transmitted in the axial direction through an interlocking mechanism (not shown) to the drive system of the servo motor 5. The moving mechanism 6, which is composed of a moving arm, is interlocked and connected to each other.

The present invention is constructed as described above, and when manufacturing the torsion spring 15, first, the load just before the scheduled number of turns of the torsion spring 15 is input into the load setting device 10 as data.

In this case, for example, when manufacturing a torsion spring 15 with a planned number of turns of 10 turns and an applied load of 0.5 kg when the working angle θ is 45°, the wire A is wound on the winding shaft 4 just before the planned number of turns, for example, 9.5 kg. After winding up to the end,
The winding shaft 4 is reversed by a certain angle, and the coil portion 15 is
Detect the load just before the winding shaft 4 of a is released from the winding tightening, and then apply the winding shaft 4 to the planned number of turns of 10.
A torsion spring 15 with a predetermined number of turns is formed by rotating until winding and cutting, and the torsion spring 15 has a working angle.
When the applied load reaches 0.5Kg (or a value close to this) at 45°, set the last load on the setting device 1.
0 as a set value.

Next, the wire A is fed into the winding shaft 4 through the guide passage 31 of the guide part 3 by the feeding means 2, and the wire A is locked in the locking part 41 of the winding shaft 4, and this locked state Then, the winding shaft 4 is rotated by the servo motor 5 and moved in the axial direction by the movable arm 6. After the winding shaft 4 has been wound up to 9.5 turns, for example, immediately before the scheduled number of turns, the servo motor 5 is rotated. The winding shaft 4 is rotated in the reverse direction by a certain angle and then stopped, the deflection load at this stop is detected by the sensor 9, and the detection result output from the sensor 9 and the setting value set by the setting device 8 are detected. and determines how hard or soft the wire material A is compared to the data wire material according to the comparison value, and controls the final number of windings of the winding shaft 4 by the motor 5 based on the result. Then, the coil portion 15a is formed.

In other words, if it is determined from the comparison value that wire A is harder than the data wire, if the final number of turns on the winding shaft 4 is 10, the applied load will be greater than 0.5〓. For example, by increasing the number of turns, such as 10.2 turns or 10.3 turns, and lengthening the wire length, the applied load is made constant.Also, if it is determined that wire A is softer than the data wire, the above-mentioned winding If the final number of turns on the shaft 4 is 10 turns, the applied load will be smaller than 0.5〓, so for example 9.8 turns or 9.7 turns.
By reducing the number of turns and shortening the wire length, the applied load can be made constant.

After forming the coil portion 15a and stopping the rotation of the winding shaft 4, the movable knife 7 is advanced toward the guide member 3, and the end surfaces of the movable knife 7 and the guide member 4 on the winding shaft side are Cut wire A at
A torsion spring 15 having a coil portion 11 and foot portions 15b and 15c at both ends thereof as shown in the figure is formed.

As a result, although some variation occurs in the free angle θ of the torsion spring 15, even if there are irregularities in the winding of the wire material A around the storage drum 1, variations in the thickness of the wire material A, the hardness of the wire material A, etc. , regardless of these conditions, the foot 15 of the torsion spring 15
By keeping the operating angle θ between b and 15c constant, the operating load during use can be made constant.

(Effect of the invention) As described above, according to the invention, the winding number detector 8 detects the number of turns of the wire rod by the winding shaft 4, and the winding number detector 8 is located between the winding shaft 4 and the guide part 3, axis 4
a load detection sensor 9 that detects the load acting in the direction of deflection of the wire wound around the torsion spring; and a load setting device 10 that sets the load acting just before the scheduled number of turns of the torsion spring.
Then, the motor 5 is controlled to reverse the winding shaft 4 just before the scheduled number of turns of the wire rod, and the detection value output from the sensor 9 during this control is compared with the setting value of the setting device 10. Since the control means 11 is provided to control the final number of turns of the wire rod by the winding shaft 4 and to make the acting load of the torsion spring constant,
Wrinkling caused by winding the wire around the storage drum 1,
Even if there are variations in the thickness of the wire or the hardness of the wire, the operating angle of the torsion spring can be kept constant, and the applied load can be made constant during use.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a torsion spring manufacturing apparatus according to the present invention, FIG. 2 is an explanatory diagram of a driving mechanism for a winding shaft, and FIG. 3 is an explanatory diagram of a torsion spring. 2... Feeding means, 4... Winding shaft, 5... Servo motor (drive motor), 7... Moving blade, 8...
Winding number detector, 9...Load detection sensor, 10...
Load setting device, 11...control means.

Claims (1)

[Scope of utility model registration request] A winding shaft 4, a drive motor 5 for rotationally driving the winding shaft 4, a feeding means 2 for feeding the wire onto the winding shaft 4 via a guide section 3, and a movable blade 7 for cutting the wire. The torsion spring manufacturing apparatus includes a winding number detector 8 that detects the number of turns of the wire on the winding shaft 4, and a wire rod located between the winding shaft 4 and the guide part 3, a load detection sensor 9 that detects the load acting in the direction of deflection of the wire, a load setting device 10 that sets the applied load just before the scheduled number of turns of the torsion spring, and a load setting device 10 that sets the winding shaft 4 in the reverse direction just before the scheduled number of turns of the wire. The final number of turns of the wire rod on the winding shaft 4 is controlled by controlling the motor 5 in order to A torsion spring manufacturing apparatus characterized in that a control means 11 is provided for making the operating load of the torsion spring constant.