SU757296A1 - Rotary dividing table - Google Patents

Description

The invention relates to machine tools.

Known rotary dividing tables, including the body, the mechanism d turn, made in the form of a worm pair, gear, installed with the possibility of free rotation relative to the shaft of the worm [1].

A disadvantage of the known tables is that they do not provide constant accuracy of division, they cannot be used for processing with circular feed.

15

The aim of the invention is the implementation of division and processing with circular feed and improving the accuracy of division.

For this purpose the housing is provided with two σποrami arranged concentrically worm axis at the end of one of which are made cams and gear mounted in these bearings is axially displaceable and provided at od ^_ 25 prefecture of the ends of the crown of cams, cooperating with cam supports, the projections of the cams bearings and gears are made with beveled surfaces. zo

2

FIG. 1 shows the proposed table, a cross-section; FIG. 2 is a section A-A in FIG. one; on fig.z section bb in figure 2; in fig. 4 is a view along arrow B in FIG. 2

The housing 1 is concentric with the axis of the shaft 2 with three wheels 3, 4 and 5 with gear rims concentric with their axes, with wheels 3 and 4 with rims facing up, and wheels 5 - lower_. Wheel 3 is the base, it is rigidly fixed in the housing 1 and occupies a certain position. The wheel 4 is rigidly connected to the faceplate 6 mounted on the shaft 2, and with the worm wheel 7, interacting with the worm 8, and set so that the gear rims of the wheel 4 serve as a continuation of the same gear rims 3. The wheel 5 is set to engage the gear the crown with the corresponding gear rims' of the wheels 3 and 4. For lifting to lower the wheel 5, i.e. for disengaging and engaging its ring gear, in the housing 1 are mounted the power cylinders 9 with the rods 10. The worm 8 privo3

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is rotated from an electric motor through a kinematic chain (not shown). Worm gear 7,

8 is backlash-free, and the worm shaft 8 is mounted on rolling bearings, the radial bearings are mounted in the housing 1 along a sliding fit. In the housing 1 is mounted a mechanism that permits the axial movement of the worm 8 in both directions. It contains gear 11, which is mounted in supports 12, 13 and freely mounted on the shaft of the worm 8. On one end of the crown gear 11 there are cams 14 concentric to the axis of the shaft of the worm 8, and the opposite end 15 of gear 11 is made basic. The gear 11 is driven by the power cylinder 16 through the rod-rail 17. At the end of the support 13, facing the crown of the gear 11, the corresponding cams with beveled surfaces are also made.

The device works as follows.

In the initial position (before the start of the division cycle) the wheel 5 is in the extreme upper position, i.e. the gear rim of the wheel 5 is disengaged from the gear rims of the wheels 3, 4. The lugs of the cams of the gear 11 abut against the beveled projections of the cams of the support 13, choosing axial clearances between the ends 15 of the gear 11 and the supports 12 on one side and the ends of the gear 11 and the supports 13 on the other parties. This position of the gear cams 11 and the supports 12 and 13 corresponds to a certain axial position of the worm 8. From the drive motor, the worm 8 is rotated through the kinematic chain and rotates the worm gear 7 and the associated face plate'6 at a preliminary angle close to the given one. The worm pair 7, 8 is made backlash free, therefore, in order to turn the faceplate 6 to the specified position, it is necessary to release the worm 8 in the axial direction. For this rod-rod 17, moving from the power cylinder 16, rotates the gear 11 and displaces the protrusions of the cams 14 of the gear 11 relative to the projections of the support 13, thus forming an axial gap between the ends of the gear 11 and the support 13.

The signal, for example, from the sensor, the rods 10 of the power cylinders 9 move down and engage the toothed rim of the wheel 5 with the toothed rims of the wheels 3, 4, and the worm wheel 7 is rotated and, consequently, the faceplate 6 to the specified angle fixing wheels 3, 4 and 5. At the end of the rotation, the rods 10 from the power cylinders 9 move upwards and take out the gear crown of the wheel 5 from the gearing, with the gear rims of the wheels 3, 4. From the power cylinder 16 the rod moves - rake 17 and returns gear 11 to position at which ystupy cams 14 abut the corresponding protrusions cam support 13 by selecting the axial gaps between the ends of the pinion 11 and the support 13). The table is prepared for the subsequent division cycle.

The proposed table is designed not only for dividing, but also for processing with circular feed from a worm gear 7, 8. For this, wheel 5 is in disengaged position with wheels 3, 4, and the worm is in position at which axial clearances between the ends of the supports 12 are selected , 13 and gears 11.

Claims (2)

Claim 1. Rotary dividing table, including the housing, the rotation mechanism, made in the form of a worm pair and gear, installed with the possibility of free rotation relative to the shaft, characterized in that, in order to implement the division and processing with circular feed and improve the accuracy of division, the body is equipped with two bearings located concentric with the axis of the worm, on the end of one of which cams are made, and the gear is installed in these supports with the possibility of axial movement and equipped with cams interacting with the cams of the support on one of the crown ends 2. Table by π. 1, which means that, in order to select the axial play in the worm support, the protrusions of the support cams and gears are made with beveled surfaces.