A tool capable of creating and measuring circles and circular profiles of any size without the need for a pivoting center arm. Circle size can be selectively adjusted and held, and both the inside and outside of tool creates and measures circles of a near infinite number of size. The tool contains marking rules such as radius, diameter, arc length, circumference, sector area, area of a circle for any size circle, etc., obviating the need for calculating the same, and any or a combination of unit measure systems can be employed.

A tool capable of creating and measuring circles and circular profiles of any size without the need for a pivoting center arm. Circle size can be selectively adjusted and held, and both the inside and outside of tool creates and measures circles of a near infinite number of size. The tool contains marking rules such as radius, diameter, arc length, circumference, sector area, area of a circle for any size circle, etc., obviating the need for calculating the same, and any or a combination of unit measure systems can be employed.

The present disclosure relates to a drawing device for creating a pattern, wherein the drawing device comprises a gear assembly that rotates upon movement of the device, the gear assembly being operatively coupled to a cam and a cam follower, such that rotation of the gear assembly rotates the cam and causes the cam to bear against the cam follower. Movement of the cam follower thereby causes lateral movement of a marker carriage housing at least one writing instrument.

The present disclosure relates to a drawing device for creating a pattern, wherein the drawing device comprises a gear assembly that rotates upon movement of the device, the gear assembly being operatively coupled to a cam and a cam follower, such that rotation of the gear assembly rotates the cam and causes the cam to bear against the cam follower. Movement of the cam follower thereby causes lateral movement of a marker carriage housing at least one writing instrument.

In a cutting device for cutting a round, a transparent substrate is arranged on an object to be cut. A sleeving tube is arranged on the transparent substrate. An end of a transverse rod penetrates through the sleeving rod and extends to over the object. The position of the transverse rod in the sleeving rod is adjusted by a locking member. The other end of the transverse rod is fixed to a cutting assembly. The cutting assembly selectively touches the object. A rotating assembly is combined with the transparent substrate and penetrates through the transparent substrate. When the rotating assembly is pressed to touch the object and the rotating assembly rotates on the object to rotate the transparent substrate, the transverse rod moves the cutting assembly to perform a round-cutting operation on the object or paint a round line on the object.

The present disclosure relates to a drawing device for creating a pattern, wherein the drawing device comprises a gear assembly that rotates upon movement of the device, the gear assembly being operatively coupled to a cam and a cam follower, such that rotation of the gear assembly rotates the cam and causes the cam to bear against the cam follower. Movement of the cam follower thereby causes lateral movement of a marker carriage housing at least one writing instrument.

The present disclosure relates to a drawing device for creating a pattern, wherein the drawing device comprises a gear assembly that rotates upon movement of the device, the gear assembly being operatively coupled to a cam and a cam follower, such that rotation of the gear assembly rotates the cam and causes the cam to bear against the cam follower. Movement of the cam follower thereby causes lateral movement of a marker carriage housing at least one writing instrument.

A pen track has an outer shell, a transmitting group, a rotating group, and a linking group. The transmitting group is mounted in the outer shell and has a portion rotatably abutting a drawing surface. The rotating group is mounted in the outer shell and has a modeling block. The modeling block is mounted in the outer shell, is rotated with the transmitting group, and has an outer surface and a modeling segment annularly formed on the outer surface of the modeling block and having multiple curved surfaces connecting each other. The linking group is mounted in the outer shell and has a pushing protrusion pressed against the modeling segment of the modeling block to move the linking group reciprocally relative to the outer shell along the curved surfaces of the modeling segment.

A pen track has an outer shell, a transmitting group, a rotating group, and a linking group. The transmitting group is mounted in the outer shell and has a portion rotatably abutting a drawing surface. The rotating group is mounted in the outer shell and has a modeling block. The modeling block is mounted in the outer shell, is rotated with the transmitting group, and has an outer surface and a modeling segment annularly formed on the outer surface of the modeling block and having multiple curved surfaces connecting each other. The linking group is mounted in the outer shell and has a pushing protrusion pressed against the modeling segment of the modeling block to move the linking group reciprocally relative to the outer shell along the curved surfaces of the modeling segment.