Pencil hole processing device

Abstract

The utility model belongs to the technical field of pencil machining devices, and particularly relates to a pencil hole machining device which comprises a workbench, a conveying mechanism is arranged on the workbench, and a feeding mechanism, a pencil body fixing and overturning mechanism, a pencil body polishing mechanism and a wood chip collecting mechanism are arranged on the conveying mechanism. The feeding mechanism is used for conveying pencils to be machined to the conveying mechanism one by one. The pencil body fixing and overturning mechanism is used for fixing the to-be-processed pencils conveyed by the conveying mechanism and overturning the to-be-processed pencils; the pencil body polishing mechanism is used for polishing multiple surfaces of the pencils on the pencil body fixing and overturning mechanism to form hole-hole pencils; the pencil body grinding mechanism is used for grinding pencil bodies, the wood chip collecting mechanism is used for collecting wood chips generated in the grinding process of the pencil body grinding mechanism, the pencil body fixing and overturning mechanism and the pencil body grinding mechanism are arranged in a matched mode, pencils can be fixed, multiple faces on the pencil bodies of the pencils can be ground and grooved, the production efficiency is improved, and the precision and the environmental protection performance in the machining process are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of pencil processing devices, in particular to a pencil hole processing device. Background Art

[0002] The Hole Pencil is a school supply designed specifically for children. Combining ergonomic principles with environmentally friendly materials, it aims to help children develop a correct pen-holding posture and improve writing and drawing skills, while ensuring their safety and health. A Hole Pencil features a regular triangle or hexagonal body with grooves. Production of a Hole Pencil requires grooves to be cut on all surfaces of the regular triangle or hexagonal body. Existing groove cutting devices can only groove one side, requiring the pen body to be flipped over multiple sides for groove cutting, resulting in low production efficiency. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a pencil hole pen processing device, which can fix the pencil and grind and groove multiple surfaces on the pencil body through the coordinated arrangement of the pencil body fixing and flipping mechanism and the pencil body grinding mechanism, thereby solving the problems in the above background.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for processing pencil holes, comprising a workbench, a transmission mechanism provided on the workbench, a feeding mechanism, a pen body fixing and flipping mechanism, a pen body grinding mechanism and a wood chip collecting mechanism provided on the transmission mechanism; the feeding mechanism is used to transport the pencils to be processed one by one to the transmission mechanism; the pen body fixing and flipping mechanism is used to fix the pencils to be processed transmitted by the transmission mechanism and perform a flipping operation; the pen body grinding mechanism is used to grind multiple surfaces of the pencils on the pen body fixing and flipping mechanism to form pen holes; and the wood chip collecting mechanism is used to collect wood chips generated by the pen body grinding mechanism during the grinding process.

[0005] Preferably, the pen body fixing and flipping mechanism includes a fixing frame arranged on the workbench, with slide rails installed on both sides of the fixing frame, a slider provided in the slide rail, a servo motor provided on the slider, and a clamping block fixedly connected to the output end of the servo motor.

[0006] Preferably, the tops of the two oppositely arranged clamping blocks are each provided with a groove matching the end of a pencil.

[0007] Preferably, the pen body grinding mechanism includes a grinding platform installed on both sides of the fixed frame, a rotating motor is provided on one side of the grinding platform, the output end of the rotating motor is fixedly connected to a rotating shaft, a grinding roller is fixedly connected to the rotating shaft, and a plurality of grinding blades are evenly arranged on the surface of the grinding roller.

[0008] Preferably, the feeding mechanism comprises a silo mounted on a workbench, an outer wall of the silo is provided with an observation window, and a discharge port is provided at the bottom of the silo.

[0009] Preferably, the transmission mechanism comprises a conveyor belt mounted on a workbench, and a plurality of jigs are equidistantly arranged on the conveyor belt.

[0010] Preferably, the wood chip collecting mechanism comprises a collecting frame arranged at the bottom of the workbench, a pull-out collecting box is arranged in the collecting frame, and a handle is arranged on one side of the collecting box.

[0011] Preferably, the four corners of the bottom of the workbench are provided with supporting legs.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a pencil hole pen processing device, which can fix the pencil and grind and groove multiple surfaces on the pencil body through the coordinated arrangement of the pen body fixing and flipping mechanism and the pen body grinding mechanism, which not only improves production efficiency but also ensures the accuracy and environmental protection of the processing process.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the three-dimensional structure of a pencil hole pen processing device Figure 1 .

[0015] Figure 2 A schematic diagram of the three-dimensional structure of a pencil hole pen processing device Figure 2 .

[0016] Figure 3 It is a cross-sectional view of a pencil hole pen processing device.

[0017] Figure 4 A schematic diagram of the three-dimensional structure of the pen body fixing and flipping grinding mechanism of a pencil hole pen processing device Figure 1 .

[0018] Figure 5 A schematic diagram of the three-dimensional structure of the pen body fixing and flipping grinding mechanism of a pencil hole pen processing device Figure 2 .

[0019] Figure 6 This is a cross-sectional view of the pen body fixed flip grinding mechanism of a pencil hole pen processing device.

[0020] In the figure: 1. Workbench; 2. Transmission mechanism; 21. Conveyor belt; 22. Jig; 3. Loading mechanism; 31. Material bin; 32. Observation window; 33. Discharge port; 4. Pen body fixing and flipping mechanism; 41. Fixed frame; 42. Slide rail; 43. Slider; 44. Servo motor; 45. Clamping block; 451. Groove; 5. Pen body grinding mechanism; 51. Grinding platform; 52. Rotating motor; 53. Rotating shaft; 54. Grinding roller; 55. Grinding blade; 6. Sawdust collecting mechanism; 61. Collection frame; 62. Collection box; 63. Handle; 7. Support leg. DETAILED DESCRIPTION

[0021] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention. All other embodiments obtained by persons of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0022] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a device for processing a hole-shaped pencil includes a workbench 1, on which is disposed a conveying mechanism 2, which is equipped with a loading mechanism 3, a pencil body fixing and flipping mechanism 4, a pencil body grinding mechanism 5, and a sawdust collecting mechanism 6. The loading mechanism 3 is used to transport the pencils to be processed one by one onto the conveying mechanism 2; the pencil body fixing and flipping mechanism 4 is used to fix the pencils to be processed after being conveyed by the conveying mechanism 2 and flip them over; the pencil body grinding mechanism 5 is used to grind multiple surfaces of the pencils on the pencil body fixing and flipping mechanism 4 into hole-shaped pencils; and the sawdust collecting mechanism 6 is used to collect sawdust generated by the pencil body grinding mechanism 5 during the grinding process. Specifically, the device for processing a hole-shaped pencil not only improves production efficiency but also ensures the accuracy and environmental friendliness of the processing process. The workbench 1, serving as the base platform of the entire processing device, is made of a high-strength, corrosion-resistant alloy material and is covered with a non-slip and wear-resistant coating to ensure stability and reliability under long-term high-load operation. The workbench 1 is integrated with an intelligent control system panel. The operator can intuitively set processing parameters, monitor the equipment's operating status, and perform remote control and fault diagnosis via a touchscreen interface. The conveyor mechanism 2 is equipped with an adjustable speed conveyor belt 21 to ensure smooth pencil transportation during processing. The conveyor belt 21 is designed with evenly spaced grooves or jigs 22 to precisely locate and grip each pencil to be processed, preventing them from shifting or falling during transport. Furthermore, the conveyor mechanism 2 features an automatic sensing function that automatically adjusts its speed based on the feed rate of the loading mechanism 3, enabling efficient and synchronized operation. The loading mechanism 3 arranges scattered pencils in an orderly manner and delivers them one by one to the jig 22 of the conveyor mechanism 2. The pencil body fixing and flipping mechanism 4 utilizes a pneumatic or electric clamping device to securely hold the pencils delivered by the conveyor mechanism 2. An internal high-precision rotary motor 52 is integrated, allowing for precise pencil flipping through programmable control to ensure uniform polishing on all sides. The pencil body grinding mechanism 5 is the core of the device, utilizing multi-axis CNC technology and equipped with a high-speed rotating grinding wheel or grinding head. Based on a pre-set machining process, the grinding wheel or grinding head automatically adjusts its angle and force to finely polish the pencil's multiple surfaces, creating a unique hole texture. A sawdust collection mechanism 6 is located below the pencil body grinding mechanism 5. Sawdust generated during the grinding process is rapidly sucked in by a powerful suction device. After filtering through multiple layers of filters, clean air is discharged, and the sawdust is collected in a dedicated collection box 62. This collection box 62 is designed to be removable for easy regular cleaning and maintenance.

[0023] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the pen body fixing and flipping mechanism 4 includes a fixing frame 41 arranged on the workbench 1, and slide rails 42 are installed on both sides of the fixing frame 41. A slider 43 is arranged in the slide rail 42, and a servo motor 44 is arranged on the slider 43. The output end of the servo motor 44 is fixedly connected to a clamping block 45. Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the tops of the two opposing clamping blocks 45 are each equipped with a groove 451 that mates with the end of a pencil. Specifically, the pencil body fixing and flipping mechanism 4 ensures the pencil's securement and flipping during processing. The fixing frame 41, serving as the support structure for the entire pencil body fixing and flipping mechanism 4, is constructed from a high-strength, lightweight alloy material, ensuring sufficient load-bearing capacity while reducing overall weight for ease of installation and maintenance. The fixing frame 41 is precisely machined and tightly connected to the workbench 1, ensuring stability and reliability even at high speeds. The slide rails 42 are constructed from high-precision, low-friction linear guides, mounted on either side of the fixing frame 41 to form a stable sliding track. The surface of the slide rails 42 has been specially treated for excellent wear and corrosion resistance, ensuring smooth, long-term sliding. The slider 43 is made of a material compatible with the slide rails 42 and is equipped with precision rolling elements, enabling smooth, gapless linear motion on the slide rails 42. Through precise control by a motor, the slider 43 drives the clamping blocks 45 for precise displacement, achieving precise positioning of the pencil. Servo motor 44, the power source for the pencil body fixing and flipping mechanism 4, features high precision and high response speed. A sophisticated encoder feedback system enables precise control of output speed, position, and torque. Within the pencil body fixing and flipping mechanism 4, servo motor 44 is directly connected to clamping block 45 via a coupling or reducer, driving the clamping block 45 in rotation to flip the pencil. The servo motor 44 also features an overload protection feature that automatically shuts down in the event of an abnormality, protecting the device from damage. Clamping block 45, the portion of the pencil body fixing and flipping mechanism 4 that comes into direct contact with the pencil, is constructed from a wear-resistant and corrosion-resistant alloy and undergoes special treatment to enhance its surface hardness and smoothness. The top of clamping block 45 features grooves 451 that perfectly match the pencil's end. These grooves 451 are precision-machined to ensure a close fit and secure grip. Furthermore, grooves 451 exhibit a certain degree of flexibility, accommodating pencils of varying diameters and lengths, enhancing the device's versatility and adaptability. During operation, once the pencil has been transported to the designated position, two opposing clamping blocks 45, driven by a servo motor 44, rapidly close together and clamp the pencil. Subsequently, the servo motor 44 changes its direction of rotation, driving the clamping blocks 45 and the pencil to flip. The pencil body fixing and flipping mechanism 4 ensures precise fixation and efficient flipping of the pencil, providing a strong guarantee for subsequent polishing and shaping.

[0024] Combine Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the pen body grinding mechanism 5 includes a grinding platform 51 mounted on both sides of a fixed frame 41. A rotary motor 52 is provided on one side of the grinding platform 51. The output end of the rotary motor 52 is fixedly connected to a rotating shaft 53. A grinding roller 54 is fixedly connected to the rotating shaft 53. A plurality of grinding blades 55 are evenly arranged on the surface of the grinding roller 54. Specifically, the pen body grinding mechanism 5 is one of the core components of the pencil hole pen processing device, responsible for grinding the multiple surfaces of the pencil into a unique hole texture, giving the pencil a new artistic form. The grinding platform 51, as the basic part of the pen body grinding mechanism 5, is mounted on both sides of the fixed frame 41, providing stable support for subsequent grinding operations. The rotary motor 52 is a key component that drives the grinding roller 54 to rotate. It is mounted on one side of the grinding platform 51 and is connected to the entire processing device through a control system. The rotary motor 52 is a high-performance, low-noise model that can reduce vibration and noise interference during operation while ensuring strong power. Its output end is tightly connected to the rotating shaft 53 via a coupling or speed reducer, ensuring smooth and reliable power transmission. The rotating shaft 53 serves as a bridge connecting the rotating motor 52 and the grinding roller 54, bearing the load and torque throughout the grinding process. The rotating shaft 53 undergoes dynamic balancing testing and calibration to ensure smooth and reliable operation even at high speeds. The grinding roller 54 directly contacts the pencil surface and performs the grinding operation. Several grinding blades 55 are evenly distributed on the surface of the grinding roller 54. The arrangement and angles of the grinding blades 55 have been carefully designed and optimized to ensure uniform and efficient cutting of the pencil surface material during rotation, creating a unique hole texture. During use, the grinding blades 55 maintain a sharp cutting edge and stable cutting performance, ensuring that every pencil is polished into a high-quality hole pen. Furthermore, to extend the service life of the grinding blades 55 and reduce replacement frequency, the grinding blades 55 are replaceable, making them easier for operators to maintain and replace during actual use. The pen body grinding mechanism 5 realizes efficient and accurate grinding of the pencil surface through the precise coordination and cooperation of the grinding platform 51, the rotating motor 52, the rotating shaft 53, the grinding roller 54 and the grinding blade 55.

[0025] Combine Figure 1 、 Figure 2 and Figure 3As shown, the loading mechanism 3 includes a hopper 31 mounted on the workbench 1. An observation window 32 is provided on the outer wall of the hopper 31, and a discharge port 33 is provided at the bottom of the hopper 31. Specifically, the loading mechanism 3, as a crucial component of the pencil hole pen processing device, is responsible for automatically and orderly transporting the pencils to be processed from storage to the subsequent processing steps. The hopper 31 is the main component of the entire loading mechanism 3, designed to safely and efficiently store and supply a large number of pencils to be processed. The hopper 31 is made of durable, easy-to-clean materials such as stainless steel or high-strength plastic to ensure good performance during long-term use. Its internal structure is rationally designed to accommodate a sufficient number of pencils while preventing them from being squeezed and damaged. The external shape and size of the hopper 31 are customized according to actual needs to perfectly integrate with the workbench 1 and occupy the smallest space. To improve operational convenience and efficiency, the hopper 31 is typically designed with an opening on the top or side to facilitate the operator's addition of pencils. The silo 31 is also equipped with a locking mechanism or lid to prevent pencils from accidentally falling out or dust from entering during processing. An observation window 32 is a transparent area located on the outer wall of the silo 31, typically made of a transparent material such as glass, acrylic, or polycarbonate. This allows the operator to visually inspect the pencil storage status within the silo 31, including the remaining number, arrangement, and any blockages or jams, without having to open the silo 31. The introduction of the observation window 32 significantly enhances the visualization and monitoring capabilities of the production process, facilitating the timely identification and resolution of problems, ensuring smooth processing. The discharge port 33 is an opening located at the bottom of the silo 31. Its function is to control the orderly discharge of pencils so that they can be accurately received by the subsequent conveyor mechanism 2. The design of the discharge port 33 must take into account factors such as the size, shape, and weight of the pencils to ensure that the pencils maintain a stable posture and speed during discharge. To achieve automatic discharge, the discharge port 33 is typically connected to some form of drive mechanism, such as a vibrator, screw conveyor, or pneumatic device. The control system precisely controls the opening and closing timing of the discharge port 33, as well as the discharge speed, to ensure that pencils are delivered to the conveyor mechanism 2 at a predetermined pace and in the desired quantity. The discharge port 33 is also equipped with an adjustment mechanism to adjust its size and shape according to actual needs. This allows the loading mechanism 3 to adapt to the processing needs of pencils of varying sizes and types, enhancing the versatility and flexibility of the equipment. The loading mechanism 3 achieves efficient and orderly loading of pencils to be processed through the coordinated operation of the hopper 31, observation window 32, and discharge port 33.

[0026] Combine Figure 1 、 Figure 2 and Figure 3As shown, the transport mechanism 2 comprises a conveyor belt 21 mounted on the workbench 1, with several jigs 22 arranged at equal intervals on the conveyor belt 21. Specifically, the conveyor mechanism 2, a key component of the pencil hole processing device, undertakes the important task of transporting pencils to be processed from one location to another. The conveyor belt 21 is mounted at a specific location on the workbench 1 and is driven by a motor to achieve continuous, smooth, and circular motion. The conveyor belt 21 is made of high-strength, wear-resistant, and corrosion-resistant materials, such as rubber, polyurethane, or special synthetic materials, to ensure excellent performance even under long-term, high-load operation. Its width and length are customized according to the size and production capacity requirements of the processing device to ensure that it can accommodate and effectively transport a sufficient number of pencils. The jigs 22 are key components installed on the conveyor belt 21 to secure and position the pencils. They are fixed to the conveyor belt 21 at equal intervals, and each jig 22 is designed with a groove or clamp that matches the shape and size of the pencil to ensure that the pencil maintains a stable posture and position during transportation. The jig 22 is typically made of lightweight, high-strength alloy or plastic to reduce overall weight and improve durability. During operation of the conveyor mechanism 2, the conveyor belt 21 and jig 22 work together to ensure efficient and stable pencil transportation. When the pencils to be processed are fed into the conveyor mechanism 2 by the loading mechanism 3, they are placed one by one in the grooves or fixtures of the jig 22 and secured. The conveyor belt 21 then begins to move, driven by a motor, moving the jig 22 and the pencils forward along a predetermined path. During transportation, the jig 22 ensures that the pencils maintain a stable posture and position, preventing them from tilting, rolling, or falling. Simultaneously, the continuous movement of the conveyor belt 21 ensures that the pencils are transported to the next processing station, such as the pencil body fixing and flipping mechanism 4 or the pencil body polishing mechanism 5, at a predetermined speed and rhythm. The conveyor mechanism 2 achieves efficient and stable pencil transportation through the precise coordination and coordinated operation of the conveyor belt 21 and jig 22.

[0027] Combine Figure 1 、 Figure 2 and Figure 3As shown, the wood chip collection mechanism 6 comprises a collection frame 61 positioned at the bottom of the workbench 1. Within the collection frame 61 is a retractable collection box 62, with a handle 63 on one side. Specifically, the wood chip collection mechanism 6 is responsible for effectively collecting and disposing of wood chips and dust generated during the machining process, maintaining a clean and safe working environment. The collection frame 61, serving as the main framework of the wood chip collection mechanism 6, is securely mounted to the bottom of the workbench 1. The shape and size of the collection frame 61 are customized based on the overall layout of the machining apparatus and the amount of wood chips generated, ensuring sufficient storage and efficient collection of wood chips. The bottom of the collection frame 61 is typically open or has a removable bottom plate to facilitate cleaning and emptying of collected wood chips. Furthermore, the edges may be equipped with sealing strips or baffles to reduce splashing and dispersion of wood chips during machining, thereby improving collection efficiency. The collection box 62 is installed within the collection frame 61 to actually store the wood chips. Its lightweight, easily retractable design allows the operator to easily remove it from the collection frame 61 for cleaning or replacement. The collection box 62 has ample internal space to accommodate a large amount of sawdust, reducing the need for frequent cleaning. A handle 63 is located on one side of the collection box 62 to help the operator easily remove the collection box 62 from the collection frame 61. In practice, the operator simply grasps the handle 63 and applies gentle pressure to smoothly remove the collection box 62 from the collection frame 61. This is not only convenient and fast, but also significantly reduces the operator's workload. The sawdust collection mechanism 6 effectively collects and processes sawdust and dust generated during processing through the precise coordination and coordinated operation of the collection frame 61, the collection box 62, and the handle 63.

[0028] Combine Figure 1 、 Figure 2 and Figure 3 As shown, the four corners of the bottom of the workbench 1 are provided with legs 7. Specifically, in order to ensure that the workbench 1 can firmly support various processing equipment and tools while maintaining a good operating height and comfort, the four corners of the bottom are cleverly provided with legs 7. The legs 7 are usually made of high-strength, corrosion-resistant metal materials, such as stainless steel or high-quality carbon steel. Not only do they have good load-bearing performance, but they can also maintain stability in humid or corrosive environments, extending the service life of the workbench. In order to meet different operating requirements and height differences of operators, some legs 7 are also equipped with a height adjustment function. Through a rotating or lifting mechanism, the operator can easily adjust the height of the workbench 1 to achieve the optimal operating position, improving processing efficiency and comfort. In order to prevent the workbench 1 from sliding due to uneven ground or vibration during use, the bottom of the legs 7 is usually provided with anti-slip pads or rubber feet. These anti-slip components can effectively increase the friction between the legs and the ground, ensuring that the workbench is stable.

[0029] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A pencil hole pen processing device, comprising a workbench (1), characterized in that: A transmission mechanism (2) is provided on the workbench (1), and a feeding mechanism (3), a pen body fixing and flipping mechanism (4), a pen body polishing mechanism (5), and a wood chip collecting mechanism (6) are provided on the transmission mechanism (2); The feeding mechanism (3) is used to transport the pencils to be processed one by one to the transmission mechanism (2); The pen body fixing and flipping mechanism (4) is used to fix the pencil to be processed transmitted by the transmission mechanism (2) and perform a flipping operation; The pen body grinding mechanism (5) is used to grind multiple surfaces of the pencil on the pen body fixing and flipping mechanism (4) to form a hole pen; The sawdust collecting mechanism (6) is used to collect sawdust generated by the pen body grinding mechanism (5) during the grinding process.

2. The pencil hole pen processing device according to claim 1, characterized in that: The pen body fixing and flipping mechanism (4) comprises a fixing frame (41) arranged on a workbench (1), slide rails (42) are installed on both sides of the fixing frame (41) relative to each other, a slider (43) is arranged in the slider (42), a servo motor (44) is arranged on the slider (43), and a clamping block (45) is fixedly connected to the output end of the servo motor (44).

3. The pencil hole pen processing device according to claim 2, characterized in that: The tops of the two oppositely arranged clamping blocks (45) are both provided with grooves (451) matching the ends of pencils.

4. The pencil hole pen processing device according to claim 3, characterized in that: The pen body grinding mechanism (5) comprises a grinding platform (51) mounted on both sides of a fixed frame (41); a rotating motor (52) is provided on one side of the grinding platform (51); an output end of the rotating motor (52) is fixedly connected to a rotating shaft (53); a grinding roller (54) is fixedly connected to the rotating shaft (53); and a plurality of grinding blades (55) are evenly arranged on the surface of the grinding roller (54).

5. The pencil hole pen processing device according to claim 4, characterized in that: The feeding mechanism (3) comprises a silo (31) mounted on a workbench (1); an observation window (32) is provided on the outer wall of the silo (31); and a discharge port (33) is provided at the bottom of the silo (31).

6. The pencil hole pen processing device according to claim 5, characterized in that: The transmission mechanism (2) comprises a conveyor belt (21) installed on a workbench (1), and a plurality of jigs (22) are arranged at equal intervals on the conveyor belt (21).

7. The pencil hole pen processing device according to claim 6, characterized in that: The wood chip collecting mechanism (6) comprises a collecting frame (61) arranged at the bottom of the workbench (1), a drawable collecting box (62) is arranged in the collecting frame (61), and a handle (63) is arranged on one side of the collecting box (62).

8. The pencil hole pen processing device according to claim 7, characterized in that: Support legs (7) are provided at the four corners of the bottom of the workbench (1).

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