Compound saw

Abstract

The invention discloses a compound saw. The compound saw comprises a machine head module provided with a table cutting worktable (2) at the top, a base (8), a turntable (7), and a machine head rotating base (10) positioned between the machine head module and the turntable (7) and respectively hinged to the machine head module and the turntable (7); the machine head module includes a motor (3), a frame (4), a gear box body (20), a transmission mechanism and a saw blade (6); the motor (3) is fixed on the frame (4); the transmission mechanism is arranged in the gear box body (20) to form a gear box module; a motor gear shaft (14) drives rotation of the transmission mechanism; the gear box module can rotate around the motor gear shaft (14); the saw blade (6) is fixed on an output shaft (15) of the transmission mechanism; and the output shaft (15) is parallel to the motor gear shaft (14). After the structure is adopted, the compound saw has such advantages as simple and reasonable structure, flexible and portable function converting operation, safe and reliable use, high cutting capacity, high cutting precision and good dust removing effect.

Description

technical field [0001] The invention relates to an electric cutting tool, in particular to a compound saw capable of switching between a table saw working mode and a miter saw working mode. Background technique [0002] As a commonly used power tool, compound saw is widely used in machinery manufacturing and other fields. The compound saw can perform functional conversion between the miter saw and the table saw, and is very convenient to use. There are two commonly used schemes in the prior art: one scheme is a commonly used compound saw structure, usually the height of the motor and the saw blade is fixed, and the table saw cutting function is realized by adjusting the height of the table cutting workbench; the other One solution is that the table cutting table panel does not move, and the lifting or rotating motor assembly is used to realize the lifting of the saw blade, thereby realizing the table cutting function. [0003] There are defects in the above two schemes in ...

AI Technical Summary

Problems solved by technology

[0003] There are defects in the above two schemes in the process of using

In the first solution, in the process of adjusting the height of the table cutting table, the relative position between the table cutting table panel and the saw blade will change. In order to ensure smooth height adjustment, there is generally a large gap in the guide mechanism to maintain the relative position. Poor stability, greatly reducing the table cutting accuracy

Because the relative position of the motor and the saw blade does not change, the thickness of the motor in the vertical direction determines the cutting ability of the table cutting and bevel cutting in height; in fact, most manufacturers will make the motor components very flat, so that It can slightly increase the cutting height of table cutting and bevel cutting, but it is very unfavorable to the design of motor and motor housing

[0004] The second scheme has two ways to lift the motor assembly through the lifting mechanism. One is that the motor lifts vertically or rotates up and down along a fulcrum outside the motor assembly. The principle of this lifting method is similar to the first scheme, only using the movement of the motor Instead of the movement of the platen; because the machining accuracy of the motor lifting guide is guaranteed, the relative accuracy of the lifting can be improved to a certain extent, but there is still the problem that the thickness of the motor component affects the cutting ability; Increasing institutional complexity

The second is that the motor assembly rotates around the center of the motor as a whole, and the eccentricity formed by the center distance of the gear transmission is used to switch between bevel cutting and table cutting, such as a compound saw disclosed in Chinese patent CN205020940, because the motor needs to rotate, so the entire rotation of the motor shape The track is circular, so compared with the conventional flat motor assembly, the height of the whole machine will be increased, and the increase in packaging volume will not only affect the transportation cost but also affect the storage space

Moreover, the output shaft and gear of this structure can only be located within the outer circle of the motor, and the eccentric distance is limited. The eccentric distance determines the maximum height of the saw blade from the table to the top of the table, which cannot provide enough lifting space, thus limiting cutting. ability

In order to expand the cutting capacity, we can only increase the shape circle of the motor, which will cause the size of the machine to be too large, and it is necessary to improve the mechanical properties of the frame structure supporting the motor components. In addition, the motor may cause the power inlet and outlet wires to be entangled during the rotation process. risk of wear and tear

[0005] No matter which scheme is adopted, the saw blade in the non-working area of ​​the existing technical scheme is exposed, and it is difficult to control it to achieve complete protection. When cutting, the top of the table is a non-working area. According to safety requirements, the sawtooth in the non-working area must be completely protected

Therefore, the usual practice is to add additional shields in the form of accessories in the non-working area for protection, and special methods are required to prevent the accessories from being lost or discarded. The structure is complicated and the operation is inconvenient

[0006] In response to the above problems, many manufacturers and people of insight have developed and developed, but so far no ideal products have come out.

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