SU950986A1 - Controlled feed ratchet-and-pawl mechanism /its versions/ - Google Patents

Description

The invention relates to mechanical engineering, in particular, to devices for converting continuous rotational motion in an intermittent manner, and can be applied in devices where adjustment of discontinuity in a wide range is required.

Known ratchet adjustable feed, comprising a housing mounted therein a coaxially driving shaft with a spring-loaded dog disposed thereon, a driven shaft with a ratchet wheel and a cutter 1 acting on the dog.

The disadvantage of this mechanism is that it limits the angle of rotation of the ratchet wheel, which limits the range of adjustment.

The purpose of the invention is to expand the range of regulation.

The goal is achieved 1 & L, which in the ratchet adjustable feed mechanism, comprising a housing, a coaxially driven shaft mounted therein with a spring-loaded pawl placed on it, a driven shaft with a ratchet wheel and a ratchet wheel acting on the pawl, two concentric tracks are made in the case grooves interconnected

an inclined section, and the cutter is made in the form of a flexible element moving along guide grooves. .

In addition, the drape mechanism of the per-guided feed is equipped with a two-position latch for the pawl, and the cutter is designed as a ratchet wheel that is movable in the direction of rotation and nesting. sliding stops with guiding elements.

The guide elements are oblique grooves, one of which is stationary, since it is made in the housing, and the other is in the rotating arm.

The advantage of the first embodiment of the ratchet mechanism is to provide a complete deactivation mode and continuous rotation of the driven shaft, but the second option has a simpler design solution.

Claims (2)

Figure 1 shows the adjustable supply ratchet mechanism, a food cut; figure 2 is a cross section aa in figure 1; Fig. 3 shows BB in Fig. 1; figure 4 30 shows the second version of the ratchet mechanism, a longitudinal section in figure 5 is a cross section bb-b in figure 4. The ratchet mechanism (version one) includes a housing 1, a drive shaft 2 coaxially mounted thereto with a driver 3, on which a dog 4c roller 5 is placed, and a driven shaft 6 with a ratchet wheel 7 fixed on it and a cover 8. The dog 4 is spring-loaded spring 9 In the inner end walls of the housing 1 and the cover 8 there are concentric guide grooves 10 and 11 connected by an inclined section 12, in the grooves there is a cutter 13 made in the form of a flexible element, for example, in the form of a plate chain moving along the guide grooves. "A sleeve 14 with a handle 15 is mounted coaxially with the shaft 2 in the housing 1. A tooth 16 is formed on the sleeve 14 for engagement with the cutter 12. The mechanism operates as follows. The pawl 4 is held by the spring 9 in engagement with the ratchet wheel 7 and, when the shaft 2 and the disk 3 rotate clockwise, clockwise leads the ratchet crease 7 and the shaft 6 until the roller 5 enters the cutter 13 in the zone of its transition from the groove 10 to the groove 11 along the inclined section 12. By turning the sleeve 14 by the handle 15, the movement along the grooves 1M 10 and 11 and section 12 is reported to the cutter 13, and the movement of the cutter clockwise increases the angle of rotation at which the dog 4 drives the ratchet wheel 7. The entire cutter 13 can be transferred to outer groove 1 etstvuet the mechanism in the coupling mode, or in the inner groove. 10, in this case, the shaft 2 rotates, and the shaft b is disconnected at intermediate positions during continuous rotation of the shaft 2, the shaft b rotates intermittently, and by turning the handle 15 it is possible to adjust the angle of rotation of the shaft without movement during one movement of the shaft 2. In the second case (FIGS. 4 and 5), the storage mechanism also includes a housing 1, a shaft 2 mounted therein coaxially with a spring-loaded dog 4 placed on it, a driven shaft 6 with a ratchet wheel 7 and a shut-off device 13 acting on the dog. and the dog and spring 9 are placed so that the dog has two whiskers stable positions, one of which is determined by a fixed stop 17 on the disk 3. The secant slider is made in the form of a fixed stop 17 and a movable pin placed on the pawl 18, as well as guide elements. The guiding elements are grooves 19 and 20, one of which is fixed 19 and is 1nen in housing thickening 21 .1, and the other is movable 20 in lever 22 placed on hub 14. The grooves are one relative to the other at an angle. The mechanism works as follows. The pawl 4 is held in engagement with the wheel 7 by a spring 9 until the finger 18 enters the groove 19 of the bulge 21. In the case shown in FIG. In 5 position, the finger 18 retracts the dog 4 and enters the groove 20 of the roller 22, which again engages the dog, the mechanism works with short stops. When the lever 22 is turned counterclockwise to the position shown by the conventional contour, the groove 19 retracts the pawl 4 up to the stop 17, withdraws it from the engagement, and the groove 18 reincludes it into engagement; when the lever 22 is turned all the way into the thickening 21 of the housing 1 on the left, the mechanism works with short-term shutdowns. In the first case, the adjustment range is O - 360 in the second case, this range is somewhat smaller by the length of the arc formed by the body thickening 21 and the end of the lever 22. But in the first and second cases, the adjustment range is significantly higher than in the known mechanism . The described variants of the adjustable supply ratchet mechanism make it possible to significantly increase the control range, as well as to apply it in machines where it is necessary to adjust the stopping time within O - 100% of the cycle duration, i.e. use it also as a disconnectable coupling. Claims 1. A variable feed ratchet mechanism comprising a housing, a coaxially mounted drive shaft with a spring-loaded pawl placed on it, a driven shaft with a ratchet wheel and a pusher acting on the pawl, characterized in that, in order to extend the range of adjustment, in KOpny. The ce is made up of two concentric guide grooves interconnected by an inclined section, and the cutter is designed as a flexible element moving along the guide guides. 2. The ratchet adjustable feed mechanism, comprising a housing, a coaxial drive shaft mounted on it with a spring-loaded dog disposed on it, a driven shaft with a ratchet wheel and acting on the dog.