JPH0731126Y2 - Winding spring direction identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a direction determining device for a winding spring.

[Conventional technology]

A wound spring in which the assembling direction of the manufactured wound spring is specified to be constant, for example, a wound spring having different winding pitches P ₁ and P ₂ at both ends as shown in FIG. 5 (a). Is often used in valve springs and other precision mechanical devices.

In order to automate the work of assembling the coil spring (a), it is necessary to supply the coil spring (a) in the specified direction.

Conventionally, the direction of the coil spring (a) is determined by the operator visually or manually inserting a clearance gauge at both ends of the coil spring (a) and measuring the winding pitches P ₁ and P _2. It was the current situation.

[Problems to be solved by the device]

The conventional technique of visually or manually determining the direction of the winding spring (a) is not only inefficient, but also has a small difference between the winding pitches P ₁ and P ₂ at both ends, that is, a so-called approximate difference. In the case of a spiral spring with a symmetrical pitch, it was difficult to accurately determine the direction.

Assuming that the pitches P ₁ and P ₂ at both ends of the coil spring (a) are automatically measured, a measuring means is installed at each portion, or one measuring means is moved to both ends. However, in this case, there are problems such as duplication of measuring means and increase of measuring time.

The present invention has been proposed in view of the above problems of the related art, and an object of the present invention is to provide a direction determination device for a winding spring that avoids duplication of means and can reduce the required time. It is a thing.

[Means for Solving the Problems]

In order to achieve the above object, the present invention uses a winding spring having different end shapes of a winding start end and a winding end end as a test object, and a jig for positioning and supporting the winding spring in a fixed position and supported by the jig. Rotation in which a plurality of terminal detection sensors, which are arranged at different radial positions between the inner and outer diameter surfaces of one end of the coil spring, and the jig and the sensor are relatively rotated about the winding center of the coil spring. It is provided with an application mechanism and a direction discriminator for discriminating the direction of the coil spring by detecting a difference between terminal detection times of a plurality of terminal detection sensors.

[Action]

Due to the difference in the end shape between the winding start and the winding end that occurs during the manufacturing process of the winding spring, one end of the winding spring that is randomly supplied and supported by the jig has a plurality of winding start and end ends. It is possible to make a distinction based on the difference in the terminal detection time points between the terminal detection sensors.

〔Example〕

FIG. 1 is a schematic side view showing an embodiment of the device of the present invention, and FIG.
FIG. 3 and FIG. 3 are explanatory views of the principle of discriminating the direction between the winding start end and the winding end end of the winding spring, and FIGS. 4A to 4C are explanatory views of the manufacturing process of the winding spring. In FIG. 1, (1) is a jig, (2) is a terminal detection sensor, and (3)
Is a rotation imparting mechanism, and (4) is a direction discriminator.

The jig (1) is for positioning and supporting the coil spring (a) at a fixed position, and has a centering chuck structure or a coil spring (a).
A bottomed cylindrical shape having an inner diameter equal to or slightly smaller than the outer diameter of is used.

A plurality of terminal detection sensors (2) are provided at different radial positions between the inner and outer diameter surfaces of one end of the coil spring (a) supported by the jig (1) (the drawing shows a case of two). ) Is arranged via a support bracket (5). As the terminal detecting sensor (2), a reflection type photoelectric switch using an optical fiber is used, but a proximity switch of another type may be used.

The rotation imparting mechanism (3) is composed of a motor or the like, and is configured to rotate the jig (1) at a low speed (for example, 72 rpm) concentrically with the winding center of the winding spring (a). The rotation imparting mechanism (3) may be configured to rotate the support bracket (5) of the terminal detection sensor (2).

The direction discriminator (4) is configured to detect the difference between the terminal detection time points of the respective terminal detection sensors (2) to discriminate and display the direction of the coil spring (a), and to issue a command to the selection means or the like. To be done.

The manufacturing process of the spiral spring (a) is as shown in FIG.
A spring material (a ') is supplied to a core metal (6) having a semicircular cross section through a guide (7), and this spring material (a') is separated by the core metal (6) and a coiling pin (8). Grasp and rotate the cored bar (6) and the coiling pin (8) at a center of the cored bar (6) by a predetermined number of turns, while the cored bar (6) and the coiling pin (8) are axially moved. , The winding spring (a) having different winding pitches P ₁ and P ₂ at both ends is manufactured by moving at a moving speed corresponding to a predetermined pitch. Then, when it is rotated by a predetermined number of turns, the rotation is stopped, and the cutter (9) is operated with respect to the core metal (6), so that the fourth
The spring material (a ') is cut as shown in Figures (b) and (c). In this case, the cutter (9) cuts the spring material (a ') by moving along the diameter line of the semicircular cored bar (6), so that one of the cut ends, that is, the coil spring ( The cut end (a ″) on the winding end side of a) is an end face inclined with respect to the diameter line passing through the center of the core metal (6), and the other cut end is the next winding spring (a). Winding start end (a
), And the winding start end (a) is a surface parallel to the diameter line passing through the center of the core metal (6). Both ends of the coiled spring (a) after coiling are polished as flat surface-shaped end turn portions orthogonal to the axis.

The difference between the end face shapes at both ends is detected by the two terminal detecting sensors (2) and (2) arranged as shown in FIGS. 2 and 3. That is, the winding start end (a) is the winding spring (a).
The two terminal detection sensors (2) and (2) arranged at different radial positions because they are parallel to the diameter line of
The time difference (t ₁ ) (t ₂ ) at the time when the terminal is detected is smaller than that when it is inclined like the winding end end (a ″), and this is at least 1 by the rotation imparting mechanism (3). The direction of the coil spring (a) is detected by rotating and detecting it and comparing it with two kinds of preset values set in the direction discriminator (4), for example, at a low rotation speed of 72 rpm. Even if there is one, the direction of one coil spring (a) can be detected in about 1 second, and the speed can be increased.

The detection of the terminal utilizes the presence of a step and captures it as a change in signal.

For example, if the pitch of the winding start end (a) is P ₁ and the pitch of the winding end end (a ″) is P _{2 in the} winding spring (a), the pitch difference between these is noticeable. The direction can be accurately discriminated even if it is close to a degree that is difficult to judge.

After the direction is discriminated, the winding spring (a) is divided into a forward chute and a reverse chute and discharged, or discharged in alignment with one side and supplied to the assembly work in the subsequent process. It is something to do.

[Effect of device]

According to the present invention, it is possible to quickly and accurately detect the direction of a spiral spring having an approximate asymmetrical pitch or the direction of a spiral spring that requires identification of the assembling direction with a very simple device.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the device of the present invention, and FIG.
FIGS. 3 and 4 are explanatory views of the principle of discriminating the direction between the winding start end and the winding end end of the winding spring, FIGS. 4A to 4C are explanatory views of the manufacturing process of the winding spring, and FIG. It is a side view which shows an example of a spring. (A) ... winding spring, (a ") ... winding end, (a)
... winding start end, (1) ... jig, (2) ... terminal detection sensor, (3) ... rotation imparting means, (4) ... direction discriminator.

Claims (1)

[Scope of utility model registration request] 1. A jig for positioning and supporting a winding spring in a fixed position, wherein a winding spring having different end shapes of a winding start end and a winding end is used as an object, and inside and outside of one end of the winding spring supported by the jig. A plurality of terminal detection sensors arranged at different radial positions between the radial surfaces, a rotation imparting mechanism for relatively rotating the jig and the sensor around the winding center of the winding spring, And a direction discriminator that discriminates the direction of the coil spring by detecting a difference between terminal detection time points of the terminal detection sensor.