SU57715A1 - Mechanism to cutting machines for automatic switching and one speed to another when reversing - Google Patents

Description

Mechanisms for metal cutting machines are known, which are designed for automatic switching from one speed to another when reversing. In these mechanisms, gears are sitting on a common drive shaft; forward and reverse.

The proposed mechanism is as described above, but differs in that the common drive shaft is hollowed out and a spring-loaded roller is placed in its cavity, equipped with cams at the ends, of which the first ones perform axial movement of the roller; at the same time, the latter acts through the second jaws on the coupling clutch, which performs switching.

In FIG. 1 is a general view of the proposed mechanism; FIG. 2 is a view of the clutch along arrow A of FIG. one; FIG. 3 is a view of the clutch along arrow B of FIG. one; FIG. 4 - friction front view.

A conical brushwood 22 is mounted on the drive shaft / freely mounted and connected to it through a gear of wireworm, not shown in the drawing, 14. Worker brush 3 sits rigidly on shaft J. Inside the drive

pin 2 mounted clutch 4, mounted on the shaft / on the tongue, the groove of which has a gap that allows rotation of the clutch at some angle relative to the shaft.

On the rollers 17 of the friction clutch 4 under the action of the springs 8, the scattering 2 is rigidly fixed to the conical bristle 22. The friction clutch 4 is equipped with cams 12 on the one side and with tongs 6 on the other side, which can enter into the holes of the body of the working schester 5 equipped with coupling 7, able to enter a circular groove: the clutch.

The drive shaft / is made hollow, and a roller 5 is placed in its cavity, pulled by the spring 11 to the left (according to the drawing). The roller 5 is provided with cams 10 and 18. The cam 10 fits into the groove of the coupling 9, movably mounted on the shaft 1 and entering cams in the openings on the side surface of the worm pin 14.

The mechanism works as follows. Gear 2 is driven by the drive and through the brush 22 and the transmission rotates the worm gear 14. As the latter is connected to the shaft 1 by the clutch 9, the shaft 1 begins to rotate, driving the gear 3, which drives the machine.

When the pinion 2 rotates in the opposite direction, the pinion 4 grabs the clutch, which, having turned at a certain angle, with its cams 12 rests against the cam 18 and moves the roller 5 to the vravvo (according to the drawing). The sequences of the cam 10 bring the coupling 9 out of engagement with the worm gear 14, which, rotating itself, ceases to transmit the rotation to the shaft /. The shaft 1 in the 3TOiMi case gets rotated directly from the gear 2 through the clutch 4, and the working gear 5 rotates with a different number of revolutions, depending on the ratio of the number of gear teeth 2 and the drive.

The next time the direction of rotation of the pinion 2 changes, it releases the clutch 4, the gear 5 with the pins 5 and 7 returns the clutch

in the initial position, which is also facilitated by the springs 8. At the same time, the roller 5 is moved to the right by the action of the spring 11 (the cams 12 do not interfere with this), and the coupling 9 again connects the worm gear 14 to the drive shaft.

The subject matter of the invention.

A mechanism for cutting machines to automatically switch from one speed to another when reversing using forward and reverse spikes on a common drive shaft, characterized by the use of a spring-loaded roller 5 located inside the drive shaft and provided at the ends with cams / 5 And 10 from the first ones are intended for axial displacement of the roller in order to influence the second cams on the coupling coupling 5, which performs the switching.

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