JPS643615B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seat adjuster assembly device,
In particular, the rollers inserted between the upper rail and the lower rail are automatically supplied with an outer diameter suitable for the dimension between the two rails.

Conventionally, a seat adjuster for an automobile has a lower rail 1 fixed to a vehicle body (not shown) and an upper rail 2 fixed to the bottom surface of a seat cushion (not shown), as shown in FIGS. 1 and 2. As shown in FIG.
interposed therebetween, so that the upper rail 2 can freely slide with respect to the lower rail 1. The upper rail 2 is stopped at an appropriate position by operating the lock lever 8 attached via the mounting plate 7 and engaging the lock piece 9 integrated with the lock lever 8 with the engagement hole 11 of the lock plate 10 attached to the lower rail 1. I'm letting you do it.

In the seat adjuster with the above configuration, if the outer diameter of the roller 4 is slightly plus (0 to 0.3 mm) with respect to the dimension l between the upper rail 2 and the lower rail 1, play will not be generated and an appropriate sliding force will be obtained. It will be done.

However, lower rail 1 and atsupa rail 2
Since the steel plate is formed by pressing or rolling, variations are likely to occur during processing, and the thickness of the steel plate also varies, resulting in considerable variation in the dimension 1 between the rails 1 and 2. Therefore, if only one type of roller with the same outer diameter is used, proper fitting cannot be obtained. Therefore, in the past, several types (usually 3 to 4 types) of rollers 4 with outer diameters changed in 0.1 to 0.2 mm increments were prepared at once, and the rollers were selected and assembled for each lot. Ta. However, with the above method, it is necessary to prepare several types of rollers at all times, which increases the number of items in stock, which increases the labor involved in inventory management.In addition, it takes time and effort to set up changing rollers, making it unsuitable for mass production. It was hot.

This invention was made in view of the above-mentioned problem, and it detects variations in machining of the upper rail and lower rail in the run-in operation process of the seat adjuster assembly process, and based on the detection results, selects a die to form the roller material. Forged to form rollers with optimal dimensions,
This system is characterized by supplying such rollers, so that it is only necessary to prepare one type of roller material with a size that is the same as or slightly smaller than the minimum outer diameter dimension. The present invention provides a sheet adjuster assembly device that eliminates the need for inventory and that improves productivity by automatically supplying rollers of optimal dimensions.

Hereinafter, this invention will be explained in detail with reference to the drawings shown in FIG. 4 and subsequent figures.

As shown in Fig. 4, the seat adjuster assembly device supplies the lower rail to the line (feeding device),
a device for fitting an upper rail into the lower rail;
A device for sending a retainer assembly in which rollers and balls are set in the retainer to a line, and assembling the retainer assembly between the lower rail and the upper rail;
A device for running in and operating an assembly assembled with the above-mentioned lower rail, upper rail, and retainer assembly,
It is installed sequentially, and the fitting process →
The retainer assembly assembling process and then the break-in operation process are performed in sequence.

In the above-mentioned break-in operation step, as shown in FIG.
A break-in operation load detection device detects the break-in load, and based on the detected load value, the die is selected in the automatic die selection and roller forging device as shown in Figure 6, and the roller material is adjusted to the optimum size. The roller is forged into a roller, and the roller is assembled into a retainer.

The above-mentioned break-in operation load detection device includes the frame 12
A lower rail stationary stand 13 is placed thereon, and a movable abutment plate 16 is placed on the front side of the lower rail stationary stand 13.
are placed. A lower rail engagement pin 17 is protruded from the upper end of the corresponding contact plate 16, and the upper end of the load converter 18 is fixed to the lower part of the corresponding contact plate 16, and the lower end of the load converter 18 is fixed to the frame 19. There is.

In this device, an assembly including the lower rail 1, upper rail 2, and retainer assembly 3 is placed on the lower rail stationary stand 13, and one side of the lower rail 1 is engaged with the engagement pin 17 of the contact plate 16. . In this state, one end of the upper rail 2 is pressed as shown by the arrow in the figure. Due to this pressing, a load is applied to the lower rail 1, and the contact plate 16 is pressed and loaded. The load applied to the contact plate 16 is transferred to the connected load converter 18.
detected. At this time, if the outer diameter of the rollers 4 is larger than the dimension l between the lower rail 1 and the upper rail 2, the load will be large, and if the outer diameter of the rollers 4 is small, the load will be small. Therefore, if the detected load is larger than the optimal load set, the outer diameter of the roller is too large and the roller outer diameter needs to be reduced, and if the detected load is smaller than the optimal load, the outer diameter of the roller is too small and the roller outer diameter is too large. It is necessary to increase the outer diameter. Based on the detection result of the above-mentioned leveling-in operation load detection device, a command signal is issued to the automatic die selection and roller forging device, so that the optimum die is automatically selected from several types of dies.

In the automatic die selection and roller forging device described above, a support shaft 22 rotated by a motor 21 is fixed to the center of a circular turntable 20. The turntable 20 is provided with stepped holes 23 near its periphery at 90 degree intervals, the lower ends of the dies 24 are fitted into each hole 23, and the dies 24 are placed on the turntable 20.
are placed. The four dies 24 have inner diameters that match the outer diameters of several types of rollers with outer diameters in 0.1 to 0.2 mm increments.
It is made to gradually become smaller in 0.1 to 0.mm increments over 4d. The above turntable 20
Pressure devices 25 and 26 for roller forging are installed between them. The lower pressure device 26 has a support frame 27 installed in contact with the lower surface of one side of the turntable 20, and a ram 29 is slidably fitted into the operating hole 28 of the support frame 27. The lower end of the support frame 27
It is connected to the upward rod 30a of the knockout cylinder 30 attached to the lower end, and the ram 29
The upper end is connected to the lower end of the middle convex lower punch 31. Therefore, by raising the ram 29,
The lower punch 31 is made to protrude upward from the hole 23 of the turntable 20 and into the hole of the die 24. Further, an upper pressure device 25 is disposed above the turntable 20 facing the lower pressure device 26. The upper pressure device 25 is similar to the lower pressure device 26, and is connected to the operating hole 33 of the support frame 32.
A ram 34 is slidably fitted in the ram 34, and the upper end of the ram 34 is connected to the lower end of the rod 35a of the downward pressure cylinder 35, and a medium convex upper punch 36 is connected to the lower end of the ram 34. There is.

The turntable 20 has a die selection proximity switch 3 at the outer peripheral end corresponding to the die mounting position.
8, 38a to 38d are provided, and a limit switch 39 for detecting the die selection proximity switch 38 is installed on the side of the turntable at a position facing the pressurizing devices 25, 26. The limit switch 39 is actuated by a command signal based on the detection result of the break-in operation load detecting device, and the turntable 20 rotates and pressurizing devices 25, 26 are activated.
The turntable 20 is stopped when the dice selection proximity switch 38 detects that the predetermined die 24 is located at the position.

Inside the die 24, there is a roller material 4 having a size that is the same as or slightly smaller than the minimum outer diameter of the roller 4.
0 is supplied, and the upper and lower punches 36,
The roller material 40 is pressed and forged with the die 28, and the roller material 40 is aligned along the inner diameter of the die 24 to form the roller 4 with the desired outer diameter.
I'm trying to get it. At that time, punch 36,2
Since a medium convex shape is used as the roller 8, a roller 4 having a desired outer diameter can be obtained without changing the length of the roller.

The relationship between the above-mentioned break-in operation load detection process, automatic die selection, and roller forging process is as shown in FIG. rotates, selects and positions a die with a small inner diameter at the position of the pressurizing device, and forges the roller material 40 to form a roller with a small outer diameter. vice versa,
When the detected load is low (Low Load), the turntable 20 rotates, selects and positions a die with a large inner diameter at the position of the forging device, and forms a roller with a large outer diameter. The retainer assembly, lower rail, and upper rail assembly incorporating these forged rollers are again detected by the break-in operation load detection device.

As is clear from the above description, according to the present invention, variations in the pressure applied to the lower rail, upper rail, and retainer assembly are detected in the break-in operation load detection process in the seat adjuster assembly process. Based on the results, a die for roller forging is automatically selected, and the roller material is forged to form a roller with the optimal outer diameter. Therefore, it is only necessary to prepare roller material with one type of size (same as or slightly smaller than the minimum outer diameter size), and there is no need to prepare rollers with several different sizes as in the past, reducing inventory waste and inventory management. It saves you the trouble of Furthermore, since rollers with the optimum outer diameter can be automatically formed for each lot, productivity can be dramatically improved.

[Brief explanation of drawings]

Fig. 1 is a front view of the seat adjuster, Fig. 2 is a side view of Fig. 1, Fig. 3 is a perspective view of the retainer assembly, and Fig. 4 shows the assembly process of the seat adjuster assembly device according to the present invention. Fig. 5 is a front view of the running-in operation load detection device, Fig. 6 is a sectional view of the automatic die selection and roller forging device, Fig. 7 is a schematic plan view of Fig. 6, and Fig. 8 is a front view of the running-in operation load detection device. This is a flow sheet showing the relationship between the operating load detection process, automatic die selection, and roller forging process. 1...Lower rail, 2...Upper rail, 3
...Retainer, 4...Roller, 5...Ball, 6
... Retainer assembly, 18 ... Load converter, 20
... Turntable, 24 ... Dice, 28,3
6... Punch, 39... Limit switch.

Claims (1)

[Claims] 1. A step of fitting the lower rail and the upper rail, a step of assembling a retainer assembly in which rollers and balls are set in the retainer between the lower rail and the upper rail, and assembling the lower rail, the upper rail, and the retainer assembly. The sheet adjuster assembly device is equipped with a step for running in the product, and a device for detecting the running-in load is provided in the running-in step, and an automatic die selection is operated in response to a detection signal from the device. and a roller forging device, and the device is equipped with several types of dies having inner diameter dimensions that match the outer diameter dimensions of several types of rollers with outer diameter dimensions in increments of 0.1 to 0.2 mm, and an appropriate die is selected based on the above detection signal. Then, a roller material that is the same as or slightly smaller than the minimum outer diameter of the roller is supplied to the die, and is forged by applying pressure with a medium convex punch, and the roller material is aligned along the inner diameter of the die to form a roller with the desired outer diameter. A seat adjuster assembly device characterized by having a configuration to form a seat adjuster.