Leather carving and soft bag cutting protractor and ruler

Abstract

This utility model relates to the field of leather processing technology, specifically to a protractor and ruler for cutting leather carving soft bags. It includes a fan-shaped block with a limiting rod above it. One end of the limiting rod extends radially outward from the outer surface of the fan-shaped block; the other end of the limiting rod is rotatably connected to the fan-shaped block, and the rotation center line is collinear with the axis of the fan-shaped block. A locking part is provided between the limiting rod and the fan-shaped block to restrict the rotation of the limiting rod. This solves the problem in the prior art where protractors only provide measurement and guidance functions and lack an effective limiting structure, leading to the tool easily exceeding the predetermined cutting range during actual cutting.

Description

Technical Field

[0001] This utility model relates to the field of leather processing technology, specifically to a protractor and ruler for cutting leather carving soft bags. Background Technology

[0002] Leather carving and upholstery cutting is a crucial step in leather goods manufacturing. It requires precise cutting of straight lines, rounded corners, or curved edges onto the leather to meet the processing requirements of products such as bags and upholstered furniture. Common cutting methods include hand cutting (using tools such as utility knives, rulers, and compasses), die-cutting (suitable for mass production), and CNC laser cutting (high precision but high cost). Among these, hand cutting remains the primary method for small-scale customization and complex pattern processing due to its high flexibility and low cost.

[0003] When manually rounding corners, operators typically need to use a protractor or round template to determine the curvature before cutting along the edge with a utility knife. However, existing protractors only provide measurement and guidance, lacking an effective limiting structure. This causes the blade to easily exceed the intended cutting range during the actual cutting process, requiring skilled technicians to overcome this challenge through experience. The operation is quite difficult, especially for beginners, and can lead to damage to expensive leather materials due to cutting beyond the limit, resulting in unnecessary waste. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a protractor and ruler for cutting leather carving soft bags, so as to solve the problem that the protractor in the prior art only provides measurement and guidance functions and lacks an effective limiting structure, which leads to the blade easily exceeding the predetermined cutting range during the actual cutting process.

[0005] This utility model is achieved through the following technical solution: A protractor for cutting leather carving soft bags includes a fan-shaped block, a limiting rod is provided above the fan-shaped block, and one end of the limiting rod extends radially toward the fan-shaped block and protrudes outside the outer circle of the fan-shaped block; The other end of the limiting rod is rotatably connected to the sector block, and the rotation center line is collinear with the axis of the sector block; A locking part is provided between the limiting rod and the sector block to restrict the rotation of the limiting rod.

[0006] Furthermore, the limiting rod has a notch on one side along the circumference of the sector block, and the notch is located on the curved surface of the outer circle of the sector block.

[0007] Furthermore, an arc-shaped groove coaxial with the sector block is formed on the top surface of the sector block, and the two ends of the arc-shaped groove extend through the two side planes of the sector block respectively; A slider is slidably fitted inside the arc-shaped groove, and the top of the slider protrudes out of the arc-shaped groove and is connected to a limiting rod.

[0008] Furthermore, one end of the limiting rod passes through the top of the slider and is slidably engaged.

[0009] Furthermore, the locking part includes a bolt located above the limiting rod. The limiting rod has a threaded hole on its top surface facing one end of the fan-shaped block axis. After the threaded end of the bolt is inserted into the threaded hole, it abuts against the top surface of the fan-shaped block, and the bolt and the threaded hole are connected by a threaded engagement.

[0010] A ruler for cutting leather-carved soft bags includes the aforementioned protractor and ruler body, wherein the fan-shaped block is detachably fixedly connected to one end of the ruler body. The outer circular surface of the sector block is tangent to a plane along the width direction of the ruler body, and the point of tangency is located on the end face of the ruler body.

[0011] Furthermore, a groove is provided at one end of the bottom surface of the ruler body, and a protrusion that matches the groove is provided on the side of the fan-shaped block opposite to the outer circular surface. One end of the protrusion is fixedly connected to the fan-shaped block, and the other end is embedded in the groove.

[0012] Furthermore, the bottom surface of the sector block is coplanar with the bottom surface of the ruler body.

[0013] Furthermore, multiple sector blocks are provided, each with a different diameter, and each sector block is provided with a protrusion. When multiple protrusions are sequentially embedded in the groove, the outer circular surfaces of multiple fan-shaped blocks are tangent to the same plane along the width direction of the ruler body, and the position of the tangent point remains unchanged.

[0014] Furthermore, a storage hole is provided on one end face of the ruler body, and a storage strip is slidably fitted inside the storage hole; The top surface of the storage strip has multiple placement slots that correspond one-to-one with multiple fan-shaped blocks, and the fan-shaped blocks are placed in the corresponding placement slots.

[0015] The beneficial effects of this utility model are as follows: This protractor and ruler for cutting leather-carved soft bags utilize a limiting rod located outside the outer surface of the sector block as a limiting structure on the outer surface of the sector block, preventing the cutter from sliding further against the outer surface of the sector block. Furthermore, the limiting rod is rotatably connected to the sector block, allowing it to rotate to the target position and be fixed by a locking mechanism. This prevents the cutter from sliding further when it reaches the target position, thus assisting the operator in controlling the cutter to stop cutting or adjust the cutting direction, reducing the risk of the cutter exceeding the predetermined cutting range.

[0016] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a three-dimensional structural diagram of the protractor in an embodiment of this utility model; Figure 4 This is a three-dimensional structural diagram of the limiting rod in an embodiment of the present utility model; Figure 5 This is a three-dimensional structural diagram of the ruler body in an embodiment of this utility model; Figure 6 This is a three-dimensional structural diagram of the storage strip in an embodiment of the present utility model.

[0018] In the diagram: 1. Fan-shaped block; 11. Arc-shaped groove; 12. Slider; 121. Sliding hole; 13. Protrusion; 2. Limiting rod; 21. Notch; 22. Threaded hole; 3. Bolt; 4. Ruler body; 41. Groove; 42. Storage hole; 43. Storage strip; 431. Placement slot. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0024] Please see Figure 1-6 This utility model provides a technical solution: a protractor for cutting leather carving soft bags, including a fan-shaped block 1, a limiting rod 2 is provided above the fan-shaped block 1, and one end of the limiting rod 2 extends radially toward the fan-shaped block 1 and protrudes out of the outer circle surface of the fan-shaped block 1; The other end of the limiting rod 2 is rotatably connected to the sector block 1, and the rotation center line is collinear with the axis of the sector block 1; A locking part is provided between the limiting rod 2 and the sector block 1 to restrict the rotation of the limiting rod 2.

[0025] In this design, the section of the limiting rod 2 outside the outer circular surface of the sector block 1 serves as a limiting structure on the outer circular surface of the sector block 1, restricting the tool (utility knife) from continuing to slide against the outer circular surface of the sector block 1. Furthermore, the limiting rod 2 is rotatably connected to the sector block 1, allowing it to rotate to a target position (such as the end point of an arc segment on leather) and be fixed by a locking part. This prevents the utility knife from continuing to slide when it reaches the target position against the outer circular surface of the sector block 1, thus assisting the operator in controlling the utility knife to stop cutting or adjust the cutting direction, reducing the risk of the tool exceeding the predetermined cutting range.

[0026] The fan-shaped block 1 can be designed as a thick block for easy gripping and pressing, or as a thin plate to increase the contact area with the leather and make the leather smoother. The appropriate shape can be selected according to actual usage needs. Angle scale lines can be engraved on the top surface or outer circular surface of the fan-shaped block 1, and the angle scale lines are located on the movement trajectory of the limiting rod 2 to assist the limiting rod 2 in adjusting to the target position.

[0027] Alternatively, a pin can be used for locking. Multiple limiting holes adapted to the pin are opened on the top surface of the sector block 1. The multiple limiting holes are evenly arranged along the circumference of the sector block 1. An insertion hole is opened on the limiting rod 2, and the limiting hole is located on the movement trajectory of the insertion hole. By inserting the pin into the insertion hole and one of the limiting holes in sequence, the rotation of the limiting rod 2 on the sector block 1 is restricted.

[0028] In this embodiment: the limiting rod 2 has a notch 21 on one side along the circumference of the sector block 1, and the notch 21 is located on the curved surface of the outer circle of the sector block 1.

[0029] In this design, the notch 21 is V-shaped, with the dimension on the side facing away from the cutter being smaller than that on the side facing the cutter, forming an flared shape. The cutter can be smoothly embedded in the notch 21, which can both restrict the cutter from continuing to slide along the circumference of the fan-shaped block 1 and restrict the cutter from sliding along the length direction of the limiting rod 2 (radial direction of the fan-shaped block 1), thus protecting the leather and further reducing the risk of the cutter exceeding the predetermined cutting range.

[0030] In this embodiment: an arc-shaped groove 11 coaxial with the fan-shaped block 1 is provided on the top surface of the fan-shaped block 1, and the two ends of the arc-shaped groove 11 extend through the two side planes of the fan-shaped block 1 respectively; A slider 12 is slidably fitted inside the arc-shaped groove 11, and the top of the slider 12 protrudes out of the arc-shaped groove 11 and is connected to the limiting rod 2.

[0031] In this design, the two ends of the arc-shaped slide groove 11 extend through the two side planes of the fan-shaped block 1, and the slider 12 can slide out / in from both ends of the arc-shaped slide groove 11 to facilitate the maintenance and replacement of components such as the limit rod 2.

[0032] The outer dimensions of the portion of the slider 12 outside the arc-shaped groove 11 are smaller than the outer dimensions of the portion inside the arc-shaped groove 11, so that the slider 12 can only slide along the length of the arc-shaped groove 11 inside the arc-shaped groove 11, thus stably supporting the limiting rod 2.

[0033] In this embodiment, one end of the limiting rod 2 passes through the top of the slider 12 and is slidably engaged.

[0034] In this design, the limiting rod 2 is prismatic in shape, and the slider 12 has a sliding hole 121 that matches the limiting rod 2. By inserting the limiting rod 2 into the sliding hole 121, the limiting rod 2 can slide on the slider 12. By adjusting the length of the limiting rod 2 protruding beyond the outer circle of the sector block 1, the limiting rod 2 can be completely inserted into the outer circle of the sector block 1, thus eliminating the limitation on the tool.

[0035] The limiting rod 2 can be interference-fitted with the sliding hole 121 to achieve a tight fit, restricting the sliding of the limiting rod 2 and stably performing the limiting work.

[0036] In this embodiment: the locking part includes a bolt 3 located above the limiting rod 2. The top surface of the limiting rod 2 facing one end of the axis of the sector block 1 has a threaded hole 22. After the threaded end of the bolt 3 is inserted into the threaded hole 22, it abuts against the top surface of the sector block 1, and the bolt 3 and the threaded hole 22 are connected by threaded engagement.

[0037] In this solution, a rubber sheet can be attached to the end face of the threaded end of the bolt 3 or a coating with a high coefficient of friction can be applied. By tightening the bolt 3, the end of the threaded end of the bolt 3 is pressed against the top surface of the sector block 1. The friction force is used to limit the rotation of the limiting rod 2 on the sector block 1 and to limit the sliding of the limiting rod 2 on the slider 12.

[0038] A ruler for cutting leather-carved soft bags includes the aforementioned protractor and ruler body 4, wherein the fan-shaped block 1 is detachably fixedly connected to one end of the ruler body 4. The outer circular surface of the sector block 1 is tangent to a plane along the width direction of the ruler body 4, and the point of tangency is located on the end face of the ruler body 4.

[0039] In this design, the outer circular surface of sector block 1 is smoothly connected to the side surface of ruler 4 (a plane along the width direction). That is, the vertical side of the outer circular surface of sector block 1 facing ruler 4 is collinear with the vertical side of the side surface of ruler 4 facing sector block 1. During the process of cutting straight segments by sliding against the side surface of ruler 4, the cutter can smoothly enter the outer circular surface of sector block 1 to cut arc segments. The ruler and protractor are connected into a whole, which can continuously cut straight segments and arc segments of leather without the need to position the ruler and protractor separately (performing two positioning cuts), reducing cutting errors and improving cutting efficiency.

[0040] Among them, the ruler body 4 is in the shape of a long strip, and length scale lines can be engraved on the top surface of the ruler body 4 to form a structure similar to a ruler, which helps to cut straight segments of leather.

[0041] In this embodiment: a groove 41 is provided at one end of the bottom surface of the ruler body 4, and a protrusion 13 that matches the groove 41 is provided on the side opposite to the outer circular surface of the fan-shaped block 1. One end of the protrusion 13 is fixedly connected to the fan-shaped block 1, and the other end is embedded in the groove 41.

[0042] In this design, the groove 41 is designed in the shape of a dovetail groove, a T-groove, etc. When the protrusion 13 on the fan-shaped block 1 is embedded in the groove 41, it can restrict the movement of the fan-shaped block 1 in the horizontal direction, thereby stably performing the guiding work.

[0043] The protrusion 13 is interference-fitted with the groove 41. The friction force restricts the protrusion 13 from sliding out of the groove 41 under its own weight, so that the relative position of the limiting block and the ruler 4 remains stable and unchanged. The ruler 4 can be moved (lifted, flipped) freely, improving its practicality.

[0044] In this embodiment, the bottom surface of the sector block 1 is coplanar with the bottom surface of the ruler body 4.

[0045] In this design, the bottom surface of sector block 1 is coplanar with the bottom surface of ruler body 4. When the bottom surface of ruler body 4 is attached to the leather, sector block 1 is simultaneously attached to the leather, pressing down on the leather to make the cut leather smoother. The various components of this ruler are tightly and stably connected, improving structural strength.

[0046] In this embodiment: multiple sector blocks 1 are provided, and the diameters of the multiple sector blocks 1 are all different, and protrusions 13 are provided on the multiple sector blocks 1; When the multiple protrusions 13 are sequentially embedded in the grooves 41, the outer circular surfaces of the multiple fan-shaped blocks 1 are all tangent to the same plane along the width direction of the ruler body 4, and the position of the tangent point remains unchanged.

[0047] In this solution, by setting multiple sector blocks 1 with different diameters, a suitable sector block 1 can be selected according to the cutting requirements of the leather, so that the ruler can cut arc segments of different diameters on the leather. When any sector block 1 is installed on the groove 41, the vertical side of the outer circle of the sector block 1 facing the ruler body 4 and the vertical side of the side of the ruler body 4 facing the sector block 1 are collinear, smoothly transitioning between straight segments and arc segments, further improving practicality.

[0048] In this embodiment: a storage hole 42 is provided on one end face of the ruler body 4, and a storage strip 43 is slidably fitted inside the storage hole 42; The top surface of the storage strip 43 has multiple placement slots 431 that correspond one-to-one with multiple fan-shaped blocks 1, and the fan-shaped blocks 1 are placed in the corresponding placement slots 431.

[0049] In this design, the storage strip 43 is prism-shaped, and the storage hole 42 is adapted to the storage strip 43. When the storage strip 43 is embedded in the storage hole 42, it can only slide along the length of the ruler body 4. The relative sliding between the two can be restricted by an interference fit. The storage strip 43 extends into a long strip along the length of the ruler body 4, and multiple placement slots 431 are evenly arranged along the length of the storage strip 43. The multiple placement slots 431 can be numbered and distinguished sequentially, and multiple sector blocks 1 are placed into the multiple placement slots 431 in order of increasing diameter along the length of the storage strip 43. This facilitates quick differentiation of the diameter of each sector block 1, making it easier for relevant technicians to pick up or store them.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A protractor for cutting leather-carved soft bags, comprising a fan-shaped block (1), characterized in that: A limiting rod (2) is provided above the sector block (1), and one end of the limiting rod (2) extends radially toward the sector block (1) and protrudes out of the outer circle of the sector block (1); The other end of the limiting rod (2) is rotatably connected to the sector block (1), and the rotation center line is collinear with the axis of the sector block (1); A locking part is provided between the limiting rod (2) and the sector block (1) to restrict the rotation of the limiting rod (2).

2. The protractor for cutting leather-carved soft bags according to claim 1, characterized in that: The limiting rod (2) has a notch (21) on one side along the circumference of the sector block (1), and the notch (21) is located on the curved surface of the outer circle of the sector block (1).

3. The protractor for cutting leather-carved soft bags according to claim 1, characterized in that: The top surface of the sector block (1) is provided with an arc-shaped groove (11) coaxial with the sector block (1), and the two ends of the arc-shaped groove (11) extend through the two sides of the plane of the sector block (1); A slider (12) is slidably fitted inside the arc-shaped groove (11), and the top of the slider (12) protrudes out of the arc-shaped groove (11) and is connected to the limiting rod (2).

4. The protractor for cutting leather-carved soft bags according to claim 3, characterized in that: One end of the limiting rod (2) passes through the top of the slider (12) and slides in fit.

5. The protractor for cutting leather-carved soft bags according to claim 4, characterized in that: The locking part includes a bolt (3) located above the limiting rod (2). The limiting rod (2) has a threaded hole (22) on its top surface facing one end of the axis of the fan-shaped block (1). After the threaded end of the bolt (3) is inserted into the threaded hole (22), it abuts against the top surface of the fan-shaped block (1), and the bolt (3) and the threaded hole (22) are connected by threaded engagement.

6. A ruler for cutting leather-carved soft bags, comprising the protractor and ruler body (4) as described in any one of claims 1-5, characterized in that: The sector block (1) is detachably fixed to one end of the ruler body (4); The outer circular surface of the sector block (1) is tangent to a plane of the ruler body (4) along the width direction, and the point of tangency is located on the end face of the ruler body (4).

7. The ruler for cutting leather-carved soft bags according to claim 6, characterized in that: The ruler body (4) has a groove (41) at one end of its bottom surface. The fan-shaped block (1) has a protrusion (13) on the side opposite to the outer circular surface that is adapted to the groove (41). One end of the protrusion (13) is fixedly connected to the fan-shaped block (1), and the other end is embedded in the groove (41).

8. The ruler for cutting leather-carved soft bags according to claim 7, characterized in that: The bottom surface of the sector block (1) is coplanar with the bottom surface of the ruler body (4).

9. The ruler for cutting leather-carved soft bags according to claim 7, characterized in that: Multiple sector blocks (1) are provided, and the diameters of the multiple sector blocks (1) are all different. Each of the multiple sector blocks (1) is provided with a protrusion (13). When multiple protrusions (13) are sequentially embedded in the groove (41), the outer circular surfaces of multiple fan-shaped blocks (1) are tangent to the same plane of the ruler body (4) along the width direction, and the position of the tangent point remains unchanged.

10. The ruler for cutting leather-carved soft bags according to claim 9, characterized in that: A storage hole (42) is provided on one end face of the ruler body (4), and a storage strip (43) is slidably fitted inside the storage hole (42). The top surface of the storage strip (43) is provided with multiple placement slots (431) that correspond one-to-one with multiple fan-shaped blocks (1), and the fan-shaped blocks (1) are placed in the corresponding placement slots (431).

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