Sliding cutting machine

Patent metadata

Field	Value
Publication number	US-12186818-B2
Application number	US-202218060750-A
Country	US
Kind code	B2
Filing date	Dec 1, 2022
Priority date	Jan 12, 2022
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A sliding cutting machine ( 1 ) includes: slide bars ( 51 ); a slide base ( 52 ), which slides along the slide bars; and a cutting-machine main body ( 10 ), which is swingable in an up-down direction about an up-down swing (pivot) shaft ( 10 a ) provided on the slide base. The cutting-machine main body includes: an output shaft ( 37 ) extending in an axial direction orthogonal to the slide bars and mounting a cutting tool ( 11 ); an electric motor ( 23 ) between the cutting tool and the slide bars when the cutting tool is vertical, and located more upward than the slide bars; and a motive-power transmitting part ( 30 ) transmitting the driving force of the electric motor to the output shaft. The motive-power transmitting part is between the cutting tool and the slide bars and upward of the slide bars when the cutting-machine main body is at a top dead center.

First claim

The invention claimed is:

1. A sliding cutting machine comprising:
at least one slide bar having an elongated shape;
a slide base mounted on the at least one slide bar and being slidable along the at least one slide bars; and
a cutting-machine main body mounted on the slide base and configured to be pivotable relative to the at least one slide bar in an up-down direction about a pivot shaft;
wherein:
the cutting-machine main body comprises:
an output shaft extending in an axial direction that is orthogonal to an extension direction of the at least one slide bar and configured to mount a cutting tool;
an electric motor supplying motive power for driving the output shaft, the electric motor being provided between the cutting tool and the at least one slide bar when viewed along the extension direction of the at least one slide bar in a state in which the cutting tool extending in a vertical plane, and being located more upward than the at least one slide bar when the cutting-machine main body is located at a top dead center; and
a motive-power transmitting part configured to transmit the motive power of a motor shaft of the electric motor to the output shaft; and

the motive-power transmitting part is provided between the cutting tool and the at least one slide bar when viewed along the extension direction of the at least one slide bar and is located upward of the at least one slide bar when the cutting-machine main body is located at the top dead center.

2. The sliding cutting machine according to claim 1 , wherein:
the motive-power transmitting part comprises a shaft configured to transmit the motive power received from the motor shaft to the output shaft; and
the shaft intersects the at least one slide bar when viewed along the axial direction and the cutting-machine main body is located at a bottom dead center.

3. The sliding cutting machine according to claim 2 , wherein the shaft has an outer diameter that is 1/40- 1/20 of an outer diameter of the cutting tool.

4. The sliding cutting machine according to claim 2 , comprising:
a shaft housing, which has a tube shape and houses the shaft;
wherein the shaft housing comprises an expanded portion, which widens in the radial direction of the shaft over the range of a follower-side end of the shaft coupled to the output shaft.

5. The sliding cutting machine according to claim 1 , wherein a distance in the axial direction from the cutting tool to the at least one slide bar is ¾ or less of an outer diameter of the cutting tool.

6. The sliding cutting machine according to claim 1 , wherein, when the cutting-machine main body is located at a bottom dead center, the electric motor is entirely located between the output shaft and the pivot shaft along the extension direction of the at least one slide bar.

7. The sliding cutting machine according to claim 1 , wherein, when the cutting-machine main body is located at the top dead center, the electric motor is entirely located more rearward than the pivot shaft.

8. The sliding cutting machine according to claim 1 , wherein the motor shaft extends parallel to a side surface of the cutting tool when viewed from a radial direction of the motor shaft in the state in which the cutting tool is extending in the vertical plane or is tilted by 10° or less relative to the side surface.

9. The sliding cutting machine according to claim 1 , wherein a center of the electric motor is disposed at a location that is 30%-50% of a distance from the cutting tool to the at least one slide bar in a surface-normal direction of the cutting tool, with the cutting tool serving as the starting point.

10. The sliding cutting machine according to claim 1 , wherein the electric motor is a brushed motor configured to be powered by alternating current.

11. The sliding cutting machine according to claim 1 , wherein:
the at least one slide bars comprises first and second slide bars provided in parallel to each other;
the first slide bar is located upward of the second slide bar; and
an outer diameter of the first slide bar is given as a (mm), an outer diameter of the second slide bar is given as b (mm), a center-to-center distance between the first bar and the second bar is given as c [mm], an outer diameter of the cutting tool is given as d (mm), and the relationship below is satisfied:
( a/ 2+ b/ 2+ c )×2< d <( a/ 2+ b/ 2+ c )×3.5.

12. The sliding cutting machine according to claim 1 , wherein the motor shaft is oriented such that, when the cutting-machine main body is located at a bottom dead center, the motor shaft assumes a tilt angle such that the motor shaft tilts upward as the motor shaft extends rearward.

13. The sliding cutting machine according to claim 12 , wherein the tilt angle of the motor shaft, when the cutting-machine main body is located at the bottom dead center, is 30°-60° relative to a horizontal plane that is perpendicular to the vertical plane.

14. The sliding cutting machine according to claim 13 , wherein, when the cutting-machine main body is located at the top dead center, the motor shaft is parallel to the horizontal plane or assumes a tilt angle that is 10° or less relative to the horizontal plane.

15. The sliding cutting machine according to claim 1 , further comprising:
a manipulatable handle configured to be grasped to move the cutting-machine main body relative to the at least one slide bar; and
in the state in which the cutting tool is extending in the vertical plane, a center of the manipulatable handle is located along a virtual plane that contains the cutting tool when viewed along the extension direction of the at least one slide bars and is located between the at least one slide bar and the cutting tool.

16. The sliding cutting machine according to claim 15 , wherein the center of the manipulatable handle is disposed at a location that is 30%-70% of the distance from the cutting tool to the at least one slide bar in the axial direction with the cutting tool serving as the starting point.

17. The sliding cutting machine according to claim 1 , further comprising:
a bottom-dead-center stopper configured to block movement of the cutting-machine main body to below a bottom dead center;
wherein, in the state in which the cutting tool is extending in the vertical plane, a center of the bottom-dead-center stopper is located between the at least one slide bar and the cutting tool when viewed along the extension direction of the at least one slide bar.

18. The sliding cutting machine according to claim 17 , wherein the center of the bottom-dead-center stopper is disposed at a location that is 30%-70% of the distance from the cutting tool to the at least one slide bar in the axial direction with the cutting tool serving as the starting point.

19. The sliding cutting machine according to claim 3 , wherein:
a distance in the axial direction from the cutting tool to the at least one slide bar is ¾ or less of the outer diameter of the cutting tool;
when the cutting-machine main body is located at the bottom dead center, the electric motor is entirely located between the output shaft and the pivot shaft along the extension direction of the at least one slide bar;
when the cutting-machine main body is located at the top dead center, the electric motor is entirely located more rearward than the pivot shaft;
the motor shaft extends parallel to a side surface of the cutting tool when viewed from a radial direction of the motor shaft in the state in which the cutting tool is extending in the vertical plane or is tilted by 10° or le

Assignees

• Makita Corp

Inventors

• Suzuki Yukinori
• Kani Toshiyuki

Classifications

• B23D45/048 Primary

  the saw blade being adjustable according to angle of cut · CPC title

• B23D47/12

  of drives for circular saw blades · CPC title

• B27C5/02 Primary

  Machines with table · CPC title

• B23D47/02

  of frames; of guiding arrangements for work-table or saw-carrier · CPC title

• B23D49/16 Primary

  actuated by electric or magnetic power or prime movers (B23D49/11 takes precedence) · CPC title