CS218487B1 - Swivel arm of the device for automatic decorative grinding of glass objects with program control - Google Patents

Abstract

The invention relates to a swing arm of a device for automatic grinding of glass objects with program control. The invention solves the problem of cut quality, in particular the same depth of cut, when creating intersecting cuts in one group. The swing arm includes a reciprocating support that carries on a holder a parallelogram with a stop and a fixture for the object to be ground using a grinding wheel. The parallelogram is connected to the control unit and an adjustable stop connected to the actuator is inserted against the stop. The adjustable stop is formed by the piston rod of the hydraulic cylinder. After the first cut in the group is made, the adjustable stop is fixed by the actuator, so that the next cuts in the group have the same depth. When performing pulled cuts, the stop is disabled.

Description

The invention relates to a pivoting arm of a program for automatically grinding glass articles with a program control comprising a reciprocating movable slide to which a parallelogram connected to a control unit and carrying a gripper for the article to be grinded is attached.

For decorative glass grinding, handicraft work requiring high skill gained through many years of practice and performed under hygienically unfavorable conditions has long prevailed. This has led to efforts to transfer this work to automatic programmable machines as described in the article “Computer Control in the Grinding Process in Crystal Glass Manufacturing” in Glass (No. 3/79 pp. 71 to 74) or as described in the article “Microprocessors” controlled glass grinder ”published in Glass magazine (eds 1/80 pp. 12 to 15). The machine contains a number of parameters for repeated reproduction of grinding different patterns and these can be changed and changed by programming technology.

It allows to set the beginning and end of the cut, circumferential spacing of cuts, spindle rotation speed, thrust, blade selection, etc. Depth of cut is given by thrust and speed, ie by removal per time unit. However, in the case of multiple intersecting cuts, it would be necessary to program a time or pressure correction when programming another cut placed partially in the space of a previously performed cut, which is technically very difficult and difficult to preset. In addition, the cutting depth is also influenced by the grinding ability of the disc, which is variable during grinding. It cannot be programmed, only modified based on visual quality control of the cut.

These drawbacks are eliminated or substantially reduced in the pivoting arm that is part of a programmable machine, and includes a reciprocating movable support to which is attached a parallelogram connected to the control unit and carrying a fixture for the ground object. SUMMARY OF THE INVENTION The parallelogram is provided with a stop against which an adjustable stop is connected to the actuator. The adjustable stop is preferably a piston rod of a hydraulic cylinder. The actuator consists of a two-way hydraulic valve with a pressure equalization vessel suitable for retained cuts, for the drawn cuts a multi-way three-position hydraulic valve connected to a source of pressure fluid is advantageous as the actuator.

In the swing arm according to the invention, the cutting depth is determined at a given down pressure and time, and in subsequent cuts intersecting the first and the next, the object is automatically ground until the desired cutting depth is reached, regardless of the changing grinding ability of the disc. . The invention can be used on various types of grinding machines.

An exemplary embodiment of the invention is described below and schematically shown in the accompanying drawings, in which FIG. 1 is a general elevational view of the pivot arm, FIG. 2 shows a detailed embodiment of the actuator, and FIG.

The pivoting arm 1 (FIG. 1), which is part of a device for automatic decorative grinding of glass articles with program control, not shown, comprises a reciprocating movable slide 2 to which it is connected by means of a parallelogram holder 4 provided with a stop 5 and carrying a fixture 6 for the object 7 designed for grinding. The control unit 8 is coupled to the holder 3 kinematically connected to the parallelogram 4. An adjustable stop 9 connected to the actuator 10 is located opposite the stop 5. The adjustable stop 9 (Fig. 2) consists of the piston rods 11 of the piston 12 of the hydraulic cylinder 13 connected to the actuator 10 3, the actuator 10 forms a multi-way three-position hydraulic valve 16 connected to a pressure fluid source 17.

The swivel arm 1 operates as follows: The pulse 2 (not shown) of the programming unit moves to the selected position of the object 7 relative to the grinding wheel 18, the control unit 8 lifts the parallelogram 4 and thereby the gripper 6 with the object 7 to the grinding wheel 18 and further engages. The cutting depth is given by the fluid pressure in the control unit 8 and the programmed time. When making a cut (Fig. 11), the stop 5 raises the adjustable stop 9. By the action of the container 15 with the two-way hydraulic valve 14 open 14, the piston 12 pushes the piston rod 11 into contact with the rising stop 5. to move the swing arm 1 with the object 7 away from the grinding wheel 18 and at the same time the open two-way hydraulic valve 14 of the actuator 10 is brought to the closed position to fix the position of the adjustable stop 9 and a fixed stop for further cuts of the same group. of the disc 18 to the next selected position to carry out the next cut of the same group, the procedure is repeated except that the lifting of the swing arm 1 is limited by a fixed adjustable stop 9. This ensures the same depth of the second and all other cuts of the same group. for the next group of cuts, the object 7 is displaced axially or longitudinally relative to the grinding wheel 18, the two-way hydraulic valve 14 is moved to the open position, the fixed position of the adjustable stop 9 is released and pressure rod 15 is pushed to the stop 5 and repeats.

This procedure is applied to the so-called retained cuts. In the case of drawn cuts, where the object 7 can also be displaced axially or along the length of the grinding wheel 18, or possibly combined, during one cut, the adjustable stop 9 cannot be used. In this case, it is advantageous to use the actuator 10 according to FIG. 3, by which the adjustment of the adjustable stop 9 can be programmed. The multi-way three-position hydraulic valve 16 is adjusted so that the liquid pressure acts under the piston 12. and undesired pressure of the adjustable stop to the stop 5.

Claims (3)

OBJECTS Swiveling arm of a device for automatic decorative grinding of glass articles with program control, comprising a reciprocating movable slide, to which is connected a parallelogram connected to the control unit and carrying a fixture for the ground object, characterized in that the parallelogram (4) is provided with a stop (5) against which an adjustable stop (9) is connected, connected to the actuator (10). 2. A rocker arm according to claim 1, characterized in that the adjustable stop (9) forms the piston rod (11) of the hydraulic cylinder (13) and the actuator (10) forms a two-way hydraulic valve (14) with a pressure equalization vessel (15). Pivot arm according to claim 1, characterized in that the adjustable stop (9) forms the piston rods (11) of the hydraulic cylinder (13) and the actuator (10) forms a multi-way three-position hydraulic valve (16) connected to the pressure fluid source (17).