CS239386B1 - Automatic ram stroke adjuster, the most eccentric press - Google Patents

Abstract

The invention relates to a device for automatic stroke adjustment, especially for eccentric presses. It belongs to the field of forming machines, machine tools, but also to other fields of possible use of the device. The invention solves a device for stroke adjustment at a qualitatively new level. The essence of the device according to the invention lies in the fact that a cylindrical sleeve is inserted between the crank of the crankshaft and the eccentric sleeve, on the outer circumference of which axial and oblique grooves with spring-loaded switches are formed, into which pins located in the eccentric sleeve fit. The rectilinear reciprocating movement of the cylindrical sleeve, during which the eccentric sleeve is rotated by an angle corresponding to the distance between two adjacent axial grooves, is ensured by a linear motor, which simultaneously serves to control the movable part of the retractable clutch connecting the eccentric sleeve with the crankshaft.

Description

239386

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for automatic stroke adjustment especially for eccentric presses.

Up to now, the known devices construct from the knuckle shaft system an eccentric bush which are connected to each other by means of a telescopic clutch, most often a stroke adjustment, so that the eccentric casing of the crankshaft is provided by various auxiliary mechanisms. One such device, representing the mechanical adjustment mechanism, is a device that allows the clutch to be removed and extended by engagement by free rotation of the free end of the crankshaft, thereby interrupting the coupling between the crankshaft and the eccentric housing. The loosening of the clutch can then be manually rotated by the eccentric sleeve on the shaft. After the stroke adjustment, the clutch engages incorrectly and engages. Another type of device permits manual rotation of the crankshaft in a stationary central housing to extend the clutch from engagement. A further device, representing a semi-automatic adjustment method, allows the clutch to be disengaged from the engagement by the pressure medium and the subsequent manual pivoting of the crankshaft against the stationary eccentric housing. This type of equipment is also equipped with a micro-drive for crankshaft rotation. The disadvantage of the described devices is their structural complexity, the necessity of intervention of the operator into the adjustment process and thus also the possibility of subjective influence, the possibility of injury, the possibility of adjusting the lift in one defined position of the crankshaft - eccentric bushing, possibly there is a need for additional auxiliaries such as balancing devices and the like. The main disadvantage of the devices known to date, however, is that the stroke adjustment process is virtually impossible to control automatically.

These and other disadvantages of prior art devices of this kind are eliminated or substantially reduced by the underlay device. The essence of this device is a cylindrical sleeve inserted between the crankshaft boy and the eccentric sleeve, on the circumference of which a set of grooves with spring switches is formed. At least one eccentric sleeve pin fits into the rebates. The cylindrical housing is connected to the movable portion of the telescopic coupling connecting the crankshaft to the eccentric housing. Thus, after each disengaged clutch, the eccentric sleeve is rotated by an angle corresponding to the distance of two adjacent axial grooves of the cylindrical sleeve. An example of an embodiment of the device according to the invention is shown in the drawing, wherein FIG. 1 shows the axial section of the device and FIG. 2 shows the arrangement of the grooves on the circumference of the cylindrical housing in the unfolded shape.

The device consists of a crankshaft 1 and 1 rotatably mounted in a stand 2, wherein a cylindrical housing 3 is mounted on the crank 1a and on its outer circumference axial grooves 3a and oblique grooves 3b are formed by spring-loaded switches 4. The cylindrical housing 3 is eccentric a housing 5 with a stationary portion 5a of the telescopic connector, the pin 6 of which engages the axial groove 3a. A connecting rod 7 with a ram is mounted on the eccentric sleeve 5, not shown. At the free end of the bar 1a, the stationary fixed portion of the linear motor 8 and the transverse tongue 9 engaging the helical grooves 10a of the movable part 10 of the linear motor fixedly connected to the flange 11 in which the rotational support is located, are fixed. The movable part 10b of the pull-out clutch is formed on the movable part 10 of the linear motor, which is fixedly connected by the cylindrical housing 3. Between the movable part 10 of the linear motor and the stationary part of the linear motor 8, a set of springs 13 is inserted.

After the pressure medium has been introduced through the rotary inlet 12, the movable part of the linear motor 10, together with the flange 31a and the inlet 12 and the cylindrical sleeve 3, are moved in the axis of the axis of the coil, at the same time the force of the spring assembly 13V is overcome. the first phase of the movement, the movable part 10b of the withdrawable clutch engages with the non-movable part of the withdrawable clutch 5a. In the second phase of movement, the eccentric bushing 5 o * is angled correspondingly to the distance of two adjacent cylindrical bushing axes 3a 3 by the deflection switches 4 which direct the movement of the pin 6 in the axial grooves 3a and the universal grooves 3b. the velocity of the movable portion 10 of the linear motor is delimited by the boundary of the guide grooves 10a.

By releasing the pressure medium through the rotary inlet 12, the device is returned to the initial position by the forces exerted by the spring 13, and the movement of the pin 6 by the resilient switches 4 is directed so that no movement of the pin 6 can occur in oblique movement. grooves 3b. The cycle described above must be repeated until the desired angle of rotation of the eccentric sleeve 5 has been achieved on the lever 1a, the required stroke size. It will be appreciated that other embodiments of the invention may be obtained by, for example, having the switch not sprung, whereby the pin will be springed, another possibility is to replace the location of the pin and the grooves with the switches.

The device according to the invention can be used in particular for eccentric presses, in which it is

Claims (2)

239386 5 discloses the control of individual functions by a microprocessor, since no operator intervention is required during the repositioning. However, the device is also suitable for upgrading older presses in operation, OBJECT 1. A device for automatically adjusting the ram stroke, in particular for a eccentric press, with a movable part of the telescopic clutch between the crankshaft and the eccentric housing being controlled by a linear motor, characterized in that it is between the boy (laj). the shaft (1) and the cylindrical sleeve (3) are inserted in the shaft (1) and the cylindrical sleeve (3) is provided on the outside of which the axial grooves (3aj and slanting grooves (3bj with spring switches (4) and in the eccentric sleeve (3) are formed 5) is also suitable for use in other types of machine tools, the principle of which requires the need to change the stroke of the skirt, the at least one pin (6), engaging the axial grooves (3a), and the cylindrical housing (3) is fixedly connected to the movable part (10) of the linear motor. 2. Apparatus according to claim 1, characterized in that, on the outer circumference of the cylindrical casing (3), grooves (3a) are formed adjacent to one another and are connected to one another by inclined grooves (3b) of the same cross-section; (3a) and a resilient switch (4) is disposed in each inclined groove (3b). 1 sheet of drawings