JPH0325874Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a spring hanging work hand in a tension coil spring assembling device for automatically and reliably assembling a tension coil spring having hook portions at both ends. be.

[Conventional technology]

A tension coil spring assembling device for automatically assembling a tension coil spring having hook portions at both ends (hereinafter simply referred to as a spring) generally includes a spring separation and supply device that separates and supplies the springs one by one;
A hook posture correction table that corrects and positions the hook portions at both ends of the spring supplied by the spring separation and supply device, and a hook that holds the spring placed on the hook posture correction table and is in the assembly position. It consists of a spring hanging work hand inserted into the receiver, and a moving means for reciprocating the spring hanging work hand between the hook posture correction table and the hook receiver.

The spring separation and supply device and the hook posture correction table are disclosed in, for example, Japanese Patent Laid-Open No. 57-46980.

FIG. 7 and FIG. 8 are a front view and a bottom view, respectively, including a partial cross section, showing a conventional spring hanging work hand in the tension coil spring assembling device, and in the figures, 1a and 1b are a pair of parallel pins;
2 is a main body to which one pin 1a is attached, 3 is an opening/closing block to which the other pin 1b is attached and supported slidably along two guide shafts 4, and 5 is a solenoid valve (not shown). An air cylinder that opens and closes the opening/closing block 3 with respect to the main body 2 at a constant interval by switching the air cylinders, 6a and 6b are a pair of cylinders that are slidable using pins 1a and 1b as guides, and 7 is a cylinder that opens and closes one cylinder 6a. A plate that is fixed and slidably supports the other cylinder 6a only in the opening/closing direction of the pin 1b through the hole 8, and 9 is a solenoid valve (not shown).
By switching the plate 7 up and down at regular intervals, the pair of cylinders 6a and 6b can be moved up and down by the pair of pins 1.
It is an air cylinder that slides at a constant interval with respect to a and 1b.

Next, the operation will be explained. FIG. 9 shows a spring hanging work hand and a hook posture correction table 2 on which springs 11 are separated and supplied one by one by a spring separation and supply device (not shown), showing the state at the start of assembly.
It shows the positional relationship with 0, and in the figure 2
1 is a stand; 22 is a movable block that is slidably placed on the stand 21 and pressed against a stopper portion 23 provided on the stand 21 by a tension coil spring 24; The base 21 and the movable block 22 each have hook portions 12 at both ends of the spring 11.
Mounting surfaces 25a and 25b are provided on which the objects can be placed horizontally, and holes 26a and 26b are formed in these mounting surfaces 25a and 25b, respectively. In addition, the air cylinder 5 of the spring hanging work hand is connected to the pin 1a,
1b, and the air cylinder 9 is operated by the plate 7 in a direction to raise the tubes 6a, 6b. In addition, in this state, pin 1
The center lines of holes 26a and 1b are positioned so as to coincide with the center lines of holes 26a and 26b. Also,
The diameters of the holes 26a, 26b are larger than the respective outer diameters of the pins 1a, 1b, and smaller than the outer diameter of the hook portion 12 of the spring 11.

If the spring hanging work hand is lowered from this state using a moving means (not shown), the pin 1a,
1b passes through the hook portions 12 at both ends of the spring 11 and enters into the holes 26a and 26b, respectively (see FIG. 10). After that, air cylinder 5
When the distance between the pins 1a and 1b is opened to a predetermined size, the pins 1a and 1b stretch the spring 11, and the hook posture correction table 20 also pulls the movable block 22 and slides against the tensile force of the coil spring 24. make it move. In this state, transportation means (not shown)
If you raise the spring-loaded work hand using
Pins 1a and 1b come out from holes 26a and 26b, respectively. At this time, the spring 11 is held by the pins 1a and 1b by tensile strength. Further, the hook posture correction table 20 is returned to its original state by the tension coil spring 24, and as shown in FIG.
be supplied with.

Using the next moving means (not shown), move the spring hanging work hand above the assembly position and pin 1.
a and 1b are brought into contact with each hook receiver 30, respectively. FIG. 11 shows only the pin 1a side. At this time, the pins 1a, 1b and each hook receiver 3
It must be coaxial with pin 1a,
The diameter of each hole in tube 1b, that is, the diameter of each hole in tubes 6a and 6b, must not be smaller than the outer diameter of each hook receiver 30. Next, by operating the air cylinder 9 and lowering the tubes 6a and 6b to a predetermined height using the plate 7, each hook portion 12 of the spring 11 is attached to the pin 1a and 1b.
The springs 11 are then moved to the grooves 31 of each hook receiver 30, and the assembly of the springs 11 is completed. FIG. 12 shows the tube 6a in the middle of its descent. Thereafter, by raising and moving the spring-loading work hand using a moving means (not shown) and operating the air cylinders 5 and 9, the system returns to the starting state shown in FIG. 9.

[Problem that the invention attempts to solve]

Since the conventional spring hanging work hand is constructed as described above, the outer diameter of the pins 1a and 1b is 6.
If it is smaller than the hole diameter of pins 1a and 6b, the hook portions 12 at both ends of the spring 11 will get caught between the hook receiver 30 and the tubes 6a and 6b when the tubes 6a and 6b are lowered, so the outer diameter of the pins 1a and 1b It is necessary to approximately match the hole diameter of the cylinders 6a, 6b, and the diameter of the cylinders 6a, 6b
Since the hole diameter of the pins 1a and 1b must be larger than the outer diameter of the hook receiver 30, the outer diameter of the pins 1a and 1b must also be larger than the outer diameter of the hook receiver 30. Spring 1
1 and the positioning accuracy of the spring hanging work hand with respect to the hook posture correction table 20, and there was a drawback that the reliability when picking up the spring 11 on the hook posture correction table 20 was poor.

This idea was made to solve the above problems, and it has a large margin of accuracy in the positioning accuracy of the spring on the hook posture correction table and the positioning accuracy of the spring hanging work hand with respect to the hook posture correction table. The object of the present invention is to obtain a hand for spring hanging work in a tension coil spring assembling device that is highly reliable when picking up a spring on a posture correction table.

[Means for solving problems]

In the spring hanging work hand of the tension coil spring assembling device according to this invention, the farthest part of each side surface of the pair of pins is in contact with each inner surface of the hole in the pair of cylinders, and the part of each side surface of the pair of pins The parts that are closest to each other are positioned so that they do not touch the inner surfaces of the holes in the pair of cylinders.

[Effect]

The diameter of the hole in the tube in this design must be larger than the outside diameter of the hook holder, as in the conventional one, but the pin can be made as thin as the strength allows, so the hook holder and tube must fit together during assembly. The spring hook part is not caught in between. Therefore, there is a large margin in the positional accuracy of the spring on the hook posture correction table and the positioning accuracy of the spring hanging work hand with respect to the hook posture correction table.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 6. FIG. 1 and FIG. 2 are a front view and a bottom view, respectively, including a partial cross section of the spring-loading hand, and in the figure, 41a and 41b are shown.
are a pair of thin pins, 42a and 42b are pins 41
These are a pair of guide pins that are attached with a and 41b eccentrically attached, and the other configurations are the same as the conventional device described above, so the same reference numerals are given and the explanation will be omitted.

Next, the operation will be explained. Figure 3 shows a spring hanging work hand showing the state at the start of assembly, and a hook posture correction table 2 on which springs 11 are placed, which are separated and supplied one by one by a spring separation and supply device (not shown).
In the figure, the hook posture correction table 20 is exactly the same as the conventional one. In this state, the center lines of the pins 41a and 41b are positioned to coincide with the center lines of the holes 26a and 26b. In addition, the holes 26a, 26
The diameter b is larger than the outer diameter of the pins 41a and 41b, and smaller than the outer diameter of the hook portion 12 of the spring 11.

When the spring hanging work hand is lowered from this state as in the conventional example, the pins 41a and 41b pass through the hook portions 12 at both ends of the spring 11, and enter the holes 26a and 26b, respectively (the fourth (see figure). Thereafter, the air cylinder 5 is operated to open the gap between the pins 41a and 41b to a predetermined size, and the hand is raised and moved using a moving means (not shown) to move it above the assembly position, and the pin is removed. 41a and 41b are brought into contact with each hook receiver 30, respectively. FIG. 5 shows only the pin 41a side. At this time, the spring 11 is held by pins 41a and 41b as in the conventional example. Moreover, at this time, the pins 41a, 41b and each hook receiver 30 are not coaxial, but the cylinders 6a,
6b and each hook receiver 30 are coaxial, so the farthest parts of the side surfaces of the pins 41a, 41b are in contact with the inner surfaces of the holes in the cylinders 6a, 6b, respectively, and the side surfaces of the pins 41a, 41b are The positional relationship is such that the closest portions do not touch the inner surfaces of the holes in the tubes 6a and 6b. Furthermore, tube 6
The diameters of the holes a and 6b must not be smaller than the outer diameter of each hook receiver 30, but the outer diameters of the pins 41a and 41b may be smaller than the outer diameter of each hook receiver 30. Next, when the air cylinder 9 is operated, the hook portions 12 at both ends of the spring 11 are connected to the pins 41 as in the conventional example.
a and 41b to the grooves 31 of each hook receiver 30, and the assembly of the spring 11 is completed. 6th
The figure shows the tube 6a in the middle of its descent. At this time, since the pin 41a is in contact with the inner surface of the hole in the tube 6a at a part 401 of the side surface farthest from the pin 41b, the hook portion 12 of the spring 11 is in contact with the inner surface of the hole in the tube 6a.
It can be seen that it does not get caught between the and hook receiver 30.

Thereafter, it is possible to return to the starting state shown in FIG. 3 in the same manner as in the conventional example.

In addition, in the above embodiment, the pins 41a, 41
b and the cylinders 6a, 6b are shown to have a circular shape, but this is not the case, and the farthest parts of the side surfaces of the pair of pins are in contact with the inner surfaces of the holes in the cylinder, respectively, and the cylinders 6a and 6b are circular in shape. It is sufficient that the closest portions of the side surfaces do not touch the inner surfaces of the pair of cylinders.

[Effect of idea]

As described above, according to this invention, the farthest parts of the side surfaces of the pair of pins contact the inner surfaces of the holes of the pair of cylinders, and the closest parts of the side surfaces of the pair of pins contact the inner surfaces of the holes of the pair of cylinders, respectively. Since it is constructed so that it does not touch each inner surface of the cylinder, not only will the spring hook part not be caught between the hook holder and the cylinder during assembly, but it will also ensure the accuracy of the position of the spring on the hook posture correction table. It is possible to increase the margin of positioning accuracy of the hanging work hand with respect to the hook posture correction table, and as a result, it is possible to significantly increase the operating rate of the machine.

[Brief explanation of drawings]

Fig. 1 is a front view including a partial cross section showing a spring hanging work hand according to an embodiment of the invention, Fig. 2 is a bottom view of Fig. 1, and Fig. 3 shows the state of the spring at the start of assembly. A front view including a partial cross section of the hanging work hand and the hook posture correction table, and FIG. 4 is a front view including a partial cross section showing the state when the spring hanging work hand holds the spring on the hook posture correction table. Figures 5 and 6 are a front view of the main parts when assembling the spring to the hook holder, and a front view including a partial cross section of the main parts, and Fig. 7 corresponds to Fig. 1 showing the conventional one. Front view, Figure 8 is the bottom view of Figure 7, Figure 9 is the 3rd view.
10 is a front view corresponding to FIG. 4, and FIGS. 11 and 12 are front views corresponding to FIGS. 5 and 6. In the figure, 6a and 6b are cylinders, 7 is a plate, and 5, 9
4 is an air cylinder, 4 is a guide shaft, 11 is a tension coil spring, 12 is a hook portion, 20 is a hook posture correction table, 41a and 41b are pins, and 42a and 42b are guide pins. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1 tension coil spring with hooks at both ends
A spring separating and supplying device that separates and supplies the springs one by one; a hook posture correction table that corrects and positions the hook portions at both ends of the tension coil springs supplied by the spring separation and feeding device; a spring-hanging work hand that holds the placed tension coil spring and inserts it into the hook receiver at the assembly position; and movement that reciprocates the spring-hanging work hand between the hook posture correction table and the hook receiver. In the tension coil spring assembling device, the spring hanging work hand has a pair of parallel pins respectively inserted into both end hook portions of the tension coil spring, an opening/closing mechanism for opening and closing the gap between the pair of pins, and A device consisting of a pair of cylinders each containing a pin in each hole and slidable and parallel to the pair of pins, and a sliding mechanism that slides the pair of cylinders respectively with respect to the pair of pins. In this case, the parts of the side surfaces of the pair of pins that are farthest from each other are in contact with the inner surfaces of the holes of the pair of cylinders, and the parts of the sides of the pair of pins that are closest to each other are in contact with the holes of the pair of cylinders. A spring hanging work hand in a tension coil spring assembling device, characterized in that the hand is in a positional relationship that does not touch each inner surface of the tension coil spring assembly device.