JPS6142784Y2 - - Google Patents

Description

[Detailed explanation of the invention] When tightening many types of screws, a screw tightening machine called a multi-axis screw tightening machine is used, but since it is not versatile in the case of production of a wide variety of types and small quantities, it is generally used at present. A single-axis screw tightening machine is mounted on a table, and positioning is performed by moving the table to accommodate changes in screw tightening positions in high-mix, low-volume production. However, since it is a single-shaft screw tightening machine, it does not have any functions that correspond to different types of screws, so in such cases, the only option is to use another station to perform the work.

This invention has been developed in view of the above-mentioned conventional drawbacks, and has been developed by arranging various types of holders and driver units necessary for screw tightening, placing them on the same moving table, and lowering the necessary holders and driver units. , it is possible to tighten various types of screws, and therefore, in a working form using a conveyor system that can hold the station, it is possible to sequentially perform various types of screw tightening at the same station.

The embodiment shown in the drawings will be explained below.
is the table base, 2 is X on the table base 1
An X-axis moving table 3 is provided so as to be slidable in the axial direction, and a Y-axis moving table 3 is provided so as to be movable in a direction perpendicular to the X-axis moving table 2 .

A mounting base 4 for the screw tightening machine is fixed to this Y-axis moving table 3, several guide shafts 5 and 5' are each stood upright on this base 4, and a top plate 6 is attached to the upper end of the guide shaft. 6. Assemble a single guide frame F by combining the base 4 and multiple guide shafts 5, 5'. The base of a holder column 8 having a screw holder 7 at its tip is freely fitted vertically into the guide shaft 5 located at the front, and the guide shaft 5 and the guide shaft 5' at the rear opposite thereto A driver unit base 9 is fitted to the unit base 9 so as to be able to slide vertically, and a pressure spring 10 is interposed between the driver unit base 9 and the holder column 8. The driver unit 11 is attached and associated with the holder 7 at the lower part, and the holder 7 is configured to supply a screw for connecting and tightening the screw feed hose 12.

A lifting cylinder 13 is provided between the driver unit base 9 and the lower base 4. When pressure fluid such as compressed air is introduced into the cylinder 13, the driver unit base 9
3 along the guide shafts 5, 5' and assumes the raised position. At this time, the holder support column 8 is configured to be pulled up by the driver unit base 9 via the timing bolt 14, and each of the guide shafts 5, 5' of the guide frame F has various types configured in this way. When screw tightening machines A, B, C, etc. are installed in parallel, and tightening machine A is used to tighten screws as shown in Figs. Machines B and C are held in the raised position so as not to interfere with the work, and when tightening a different type of screw, tightening machine B is lowered to the operating position (Fig. 4). The other tightening machines A and C hold it in the raised position,
Furthermore, when all the screws have been tightened, when parts to be screwed are supplied, or when the table is moved to change the use of screw tightening machines A, B, and C, all screws must be tightened. Of course, the tightening machines A, B, and C are held in the raised position as shown in FIG. Although the figure shows an example where three types of screw tightening machines A, B, and C are provided, if there are multiple types of tightening machines that are suitable for each type of screw tightening, it is not necessarily limited to three types. Needless to say, this is not something that can be done.

Note that a component 15 is fixed on a pallet 16, and is placed in a mounting position so that another component 17 can be attached to this component 15 by screwing. Although not shown in the figure, this palette 16
is conveyed by a conveyor capable of retaining, and is suitably constructed so that it can be stopped at a highly accurate stopping position at a screw tightening station.

With the above configuration, the X-axis and Y-axis moving tables 2 and 3 are moved, controlled and positioned by, for example, an NC device, and then the lifting cylinder 13 of the screw tightening machine of the A unit is activated. Since the driver unit base 9 is lowered, the driver unit 11 is lowered, and the holder column 8 is also lowered via the pressure spring 10, and the holder 7 is lowered to the screw tightening position, while the driver unit base 9 is further lowered and the holder is lowered. Tighten the screw by contacting the screw housed in the tip of 7. When the screw tightening is completed, the cylinder 13 is activated again to raise the holder column 8 via the driver unit base 9 and the timing bolt 14, and the moving tables 2 and 3 move to tighten the screws of the next B unit. The machine is brought to the screw tightening position, and screws or nuts are sequentially tightened in the same way as screws of different types are tightened under the same operation as described above.

This invention is based on a screw tightening machine mounted on a movable table as described above, in which a plurality of different screw tightening machines are assembled into a single guide frame F so that they can be operated individually on the same movable table. This is because it is possible to tighten different types of screws or nuts by moving the movable table as necessary.
During parts assembly work, a single moving table can be used to tighten a wide variety of small quantities of screws in an orderly manner.Therefore, when tightening many types of screws, there is no need to use multiple moving tables for each type of screw tightening.
The overall configuration of the device is simple, and if the moving table is combined with a Z-axis in addition to the X-axis and Y-axis so that it can be controlled in the height direction, the range of its use will be further expanded, making it extremely effective. This has the effect of providing an efficient screw tightening machine.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of an embodiment of the multi-type screw tightening machine according to the invention, and FIG. 2 is a front view showing the state in which the A unit screw tightening machine is operated. FIG. 3 is a front view showing a state in which all unit screw tightening machines are lifted up, and FIG. 4 is a front view showing a state in which the B unit screw tightening machine is used. 1...Table base, 2...X-axis moving table, 3...Y-axis moving table, 4...Base,
5, 5'...Guide shaft, 6...Top plate, 7...
...Holder, 8...Holder support, 9...Driver unit base, 10...Press spring, 11...
...Driver unit, 12...Screw feeding hose, 13...Lifting cylinder, 14...Timing bolt, 15, 17...Parts, 16...Pallet, A, B, C...Each screw tightening machine, F ...Guide frame.

Claims (1)

[Scope of utility model registration request] In a screw tightening machine placed on a moving table,
A plurality of different screw tightening machines A, B, C, etc. are assembled into a single guide frame F and installed on the same movable table so that they can be operated individually. A multi-type screw tightening machine that can tighten screws by operating a screw tightening machine that is suitable for tightening different types of screws or nuts.