SU144391A1 - Automatic sawing machine for keyboard and piano production - Google Patents

Description

Machines for the automatic sawing of a keyboard shield in the manufacture of pianos and pins are known, using a slider with a circular saw, a camshaft camshaft, a lever feeder with a ratchet mechanism and a movable along the base of the carriage carrying the workpiece. These existing machines did not provide the ability to automatically change the cutting direction of the saw at a variable angle and the direction of movement of the workpiece.

In the proposed machine, an automatic change in the cutting direction of the saw each time from a different angle is possible due to the fact that the guide beam is rotatably mounted on a vertical axis and provided with a bracket with a roller interacting with a cam mounted on a movable carriage carrying the workpiece.

In addition, the machine used a system of two swivel on mutually perpendicular axes and interacting with each other rollers, one of which is mounted on a slide, and the other on the lever, driven by a camshaft. This system allows the slide to move along a guide beam at a different angle of rotation.

FIG. 1 shows the kinematic diagram of the machine; in fig. 2-keyboard shield.

From the motor / through the screw pair 2, the shaft 3 is rotated, on which the cam 4 and the cylindrical gear 5 are rigidly fixed, which meshes with the gear 6. The gear 6 sits on the same shaft 7 with the face cam 8 interacting with the dog 9 A spring-loaded spring 10. which, when rotated on an axis, engages with a rack 12. A gear rack is rigidly connected to

Lo 144391

table 13, which moves with it along the guide 14. The teeth on the rail 12 are cut with a variable pitch, corresponding to the width of the groove cut. The processed shield 15 is attached to the table with clips 16 and fixed on pins 17 rigidly fixed on the table.

A disk saw 18, driven by the electric motor 19 through a belt transmission, is attached to the movable carriage 20 moving along the rail 2). The guide 2 / pivotally mounted on the pin 22. The carriage 20 moves in the longitudinal direction by two tension springs 23. The springs 23 are tensioned with the carriage 19 and the subsequent tempering is done by hinged levers 24 driven by an electric motor / through the cam 4. Stroke length the carriage 20 is adjusted by a adjustable stop bolt.

Copier 25 is rigidly fixed to table 13, driven by roller 26 fixed on lever 27, welded to guide 21 of carriage 20.

When moving the table 13 by one turn to carry out the next cut, which must be carried out at a certain angle, the lever 27 with the roller 26 rotates the guide 2 / with the carriage 20 by the required angle relative to the shield.

Three groups of grooves are sawn into the back of the shield, each of which is at an angle of 12 °, the last cut in the first group coincides at the end of the groove with the first cut of the second group, and the last cut of the second group coincides with the first cut of the third group of grooves. To perform this operation, it is necessary that, when being fed, the carriage 20 at the joints of the grooves rotates by 12 °. This is ensured by the presence of an additional mechanism consisting of protrusions 25 fixed to the table and connected via rods 29 pivotally connected to each other with plates 30 that move along guide rails 31. These plates overlap the copier protrusions, i.e., turn them off when interacting with position of the protrusions 28 with the hinged rods 29 and with the dog 9. Due to this, the carriage is rotated to the desired angle of 12 °.

The proposed machine automates manual labor-intensive operations, testing it at the Chernigov factory of musical instruments showed good results.

Subject invention

Claims (2)

1. The machine for automatic sawing up of a keyboard board in the manufacture of pianos and roles using a slide-carriage moving along the directions, her beam with a circular saw, a cam camshaft, a lever feeder with a ratchet mechanism and a carriage movable on the bed, carrying the workpiece, differing from that, for the purpose of automatically guiding the saw cut at a variable angle, the guide beam is rotatable mounted on the vertical axis and provided with a bracket with a roller interacting with a cam mounted on IG Petritskaya carriage carrying the workpiece. 2. The machine tool according to claim 1, characterized in that, in order to move the slide, along a guide beam at a different angle of rotation of the latter, a system of two swivels on mutually perpendicular axes and interacting rollers, one of which is mounted on the sled, and the other on the lever, driven from the camshaft.