SU1025507A1 - Power pretsaw - Google Patents

Abstract

A MECHANICAL LOBZIK containing an engine placed in the housing, on the shaft of which an eccentric with a pinch is mounted, a slider connected to the spike and the balancing mechanism is kinematically connected to the cam eccentric and located on the other side of the slide, while the additional eccentric is rigidly connected with the spike, and the balancing mechanism is made in the form of two centered wings, rigidly connected to each other and spring-loaded to the slide. i (lc tc was eating

Description

The invention relates to mechanical engineering, in particular to the construction of mechanical jigsaws used for processing wood, metal and other building materials.

A mechanical jigsaw is known, which contains a motor in a housing with a drive shaft on which an eccentric with a crank is mounted, through which the slider of the saw blade and the balancing rocker mechanism are driven. Moreover, the guide sliders of both mechanisms are arranged so that the sliders reciprocate in parallel planes at an angle of 90 ° to each other, and a counterweight is mounted on the drive shaft.

The balancing of the inertial forces in this device is accomplished by observing the equality of the geometric sum of the reactions of the two rocker mechanisms, which move mutually perpendicularly with the rotating vector of the counterweight 1.

However, the design of a known mechanical fret-saw does not provide for the redistribution of forces between the saw blade and the balancing mechanism, which causes the body to vibrate due to the cyclical loading of the saw blade.

The purpose of the invention is to reduce vibrations.

The goal is achieved in that a mechanical jigsaw containing a motor placed in the housing, on whose shaft an ejector with a spike is mounted, a slider associated with the spike and a balancing mechanism kinematically associated with the eccentric, has an additional eccentric mounted in-phase eccentric and located on the other side of the slider, while the additional eccentric is rigidly connected with the spike, and the balancing mechanism is made in the form of two scenes located respectively on the eccentrics, rigidly connected between each other and spring-loaded to the ram.

FIG. 1 shows a mechanical jigsaw, a longitudinal section; in fig. 2 shows section A-A in FIG. I; in fig. 3 shows a section of FIG. one.

The mechanical jigsaw includes a housing 1 in which is placed an electric motor with a gearbox (not shown).

On the drive shaft 2, an eccentric 3 C is mounted with a pinch 4, which drives the slider 5, on which the saw blade 7 is mounted on the holder 6.

At the other end of the pinch 4, an additional eccentric 8 is installed, which is in-phase with the eccentric 3 and has the same mass with it. Eccentric 8

mounted on the shaft 9, hatching in the lid of the housing 1. On eccentrics 3 and 8 are installed symmetrically to the axis of the slide 5 of equal mass, the wings 10 and 11 are balanced by a mechanism rigidly connected to each other by means of 12 and spring-loaded spring 13 to the slide, 5.

The balancing mechanism with its link 10 is kinematically connected with the lever 14 of the blade swing mechanism.

Mechanical jigsaw works as follows.

When the drive motor is turned on, its rotation is transmitted through the gearbox to the drive shaft 2, eccentric 3 and through pinch 4 to the additional eccentric 8 sitting on the shaft 9 in the housing 1. The reciprocating movement of the saw blade 7 fixed in the holder 6 is carried out through the slider 5 planted on the spike 4. The rotation of the in-phase eccentrics 3 and 8 causes the reciprocating 10 and 11, which are planted on these eccentrics symmetrically to the axis of the slider 5, to be reciprocated. The anti-phase reciprocating The movement of the slider 5 with the saw blade 7 and the wings 10 and 11 of the balancing mechanism provides conditions for the mutual balancing of the two mechanisms. To eliminate momentary imbalance in the plane passing through the axis of the jigsaw, the scenes 10 and 11 are made of the same mass and are symmetrically positioned relative to the axis of the slide 5.

To smooth the torque on the motor shaft and reduce the vibration from the variability of the reactive moment between the slider 5 and the hard 12, which rigidly connects the curtains 10 and 11, a spring 13 is installed, which stores energy at idle and reduces moment of resistance on the engine shaft. As a result, smoothing of the moment on the engine shaft during the whole cycle occurs, the variability of the jet torque of the engine decreases, and consequently, the vibration of the entire machine is reduced.

The reciprocating motion of the link 10 is used to drive the swing mechanism of the saw blade 7 by periodically pressing the slide 10 on the spring-loaded lever 14, which ensures the feed of the saw blade 7 to the material being processed at the working stroke.

The proposed design of the mechanical fret saw provides a reduction in vibration during its operation, as a result of which its reliability and durability are ensured.

Aa

13

FIG. 2

Bb

eleven

12

eight

12

FIG. five

Claims (1)

MECHANICAL Jigsaw containing a motor located in the housing, the shaft of which is equipped with an eccentric with a spike, a slider connected with a spike, and a balancing mechanism kinematically connected with the eccentric, characterized in that, in order to reduce vibration, the jigsaw is equipped with an additional eccentric installed in phase with the aforementioned the eccentric and located on the other side of the slider, while the additional eccentric is rigidly connected to the spike, and the balancing mechanism is made in the form of two located respectively on the eccentric rikah wings are rigidly connected to each other and spring biased toward the slider.