SU755496A1 - Apparatus for automatic changing of tools - Google Patents

Description

The invention relates to the field of machine tools and can be used in multi-operational machines such as "Machining Center".

A device for automatic tool changing is known, which consists of a kulyikovy mechanism of rotation and axial movement of the shaft with the tool change lever and the mechanism keeping it from turning, while it is equipped with a block of gear wheels, a guide rail and a gear sector fixed respectively on the shaft with the tool change lever, on the device body and on the shaft rotation mechanism, the latter two of which interact in turn with one of the gear block wheels [1].

This device during operation carries out ¹⁵ simultaneous gripping of the tool in the spindle and in the magazine, turning 90 ° from the initial position; outputs from tool store and the spindle cone socket is rotated in the same direction through 180 °, of ₂ inset wish to set up a new tool in the spindle, while the old slot to store and returned to the original position by turning 90 ° in the opposite direction. Wherein

2

the toothed sector at the time of moving the tool change lever forward or back makes an idle turn, corresponding to the tool change lever turning by 180 °, which is necessary in order to provide a closed cam profile of the cam mechanism. With a tool with a short cone, the movement of the tool change lever forwards and backwards is small to ensure idle rotation of the toothed sector at this time, so you have to unjustifiably overestimate the time the tool change lever moves forward or backward, thereby overestimating the tool change time.

The purpose of the present invention is to reduce tool change time.

For this, the cam mechanism of rotation and axial movement of the shaft is additionally equipped with a toothed sector, which periodically interacts with the second wheel of the toothed unit, and the toothed sectors with their respective gearing unit wheels have different gear ratios.

Thus, the presence of two toothed sectors of the cam mechanism of rotation rotates the tool change time.

3

This is due to the provision of rotation of the shaft with the tool change lever by 9.0 ° in both directions from one toothed sector, and rotation by 180 ° from the other sector, with a single turn of the gear sector corresponding to rotation of the shaft with the tool change lever by 180 ° in the opposite direction, combined with a turn of the shaft 90?

The drawing shows the proposed device, the cut.

The automatic tool changer has a housing 1 in which a worm 2 is located, driven by an electric motor (not shown). A worm gear 3, which sits on shaft 4, is coupled with a worm 2. A cam drum 5 is fixed on the same shaft. In case 1, an axis 6 is fixed, on which toothed sectors 7 and 8 are movably mounted with fingers 9 and 10 located in grooves on the front the surfaces of the cam drum 5. In case 1, a shaft 11 is movably mounted with a tool change lever 12. Gears 13 and 14 are rigidly fixed on shaft 11. Gear 13 is coupled with a gear sector 7. A holder 15 with a pin 16 is movably in a radial direction on shaft 11, located in a groove on cyl indrick surface cam drum 5. In the housing 1 is fixed guide pin 17 of the holder 15.

The device works as follows.

The worm 2, receiving rotation from the electric motor, transmits it through the worm wheel 3 and the shaft 4 to the cam drum 5. The drum 5, interacting with its left end groove with the finger 9 of sector 7, turns it around the axis 6. Sector 7 through gear 13 and shaft 11 turns tool change lever 12 at an angle of 90 ° clockwise. At the time of the turn of the lever 12, the finger 16 is located in a groove located on the cylindrical surface of the cam drum 5, which is currently parallel to the end of the cam drum 5, therefore at the moment of the turn the lever for changing the tool 12 does not make axial movements. After the turn of the lever 12 is completed at an angle of 90 °, the finger 9 is positioned in a groove on the left end surface of the cam drum 5 located radially to the axis of rotation of the drum 5, therefore the lever 12 does not perform rotational movements. At this time, the location of the groove on the cylindrical surface of the drum 5 is changed to an angle to the end of the drum 5 and under the action of this groove finger 16, and with it the holder 15 with the shaft 11 and the lever 12

four

starts moving forward. From the reversal of the holder 15 keeps the guide key 17. Next, the toothed sector 7 disengages from the gear 13, and the toothed sector 8 engages with the gear 14. According to the change in the profile of the right face groove on the drum 5, sector 8 through gear 14 and the shaft 11 under the action finger 10, interacting with the profile of the right face groove on the cam drum 5, rotates the lever 12 at an angle of 180 ° clockwise, then comes back and rotated 90 ° counterclockwise to its original position. The tool change cycle is over.

The next cycle starts by turning the engine on. To ensure the closedness of the right mechanical groove of the cam drum 5, sector 8 makes an idle stroke corresponding to the angle of rotation of the gear 14 at an angle of 180 ° counterclockwise, at the moment the lever 12 moves backwards and rotated 90 ° counterclockwise to its original position or at the time of rotation 90 ° clockwise and forward. It is possible for sector 8 to make two idle strokes, corresponding to the angle of rotation of gear 14 at an angle of 90 ° counterclockwise each, at the time the tool change lever 12 moves backward and rotated 90 ° counterclockwise, to its original position, and at the time that the lever 12 turns 90 ° clockwise and forward.

Claims (2)

Claim 1. A device for automatic tool changing, comprising a gear unit, mounted on a shaft with a tool change lever, interacting with one gear wheel gear toothed sector of the cam mechanism for rotation and axial movement of the shaft and mechanism for holding the shaft against rotation, characterized in that in order to reduce the tool change time, the cam mechanism for rotation and axial movement of the shaft is additionally equipped with a gear sector, which periodically interacts with the second wheel of the gear block. 2. Device by π. 1, characterized in that, in order to ensure smooth operation, the gear sectors with their corresponding gear wheels have different gear ratios.