Automatic feeding device for bamboo charcoal production

Abstract

The invention relates to the field of annular conveying equipment, in particular to an automatic feeding device for bamboo charcoal production, which comprises an annular rail, the end parts of the annular rail are connected end to end through a connecting section, guide chains are arranged in the annular rail and the connecting section, an outer rail is mounted in the middle of the outer side wall of the annular rail, and the annular rail is connected with a plurality of release assemblies through the outer rail. The releasing assemblies comprise sliding frames, limiting grooves are formed in the upper portions and the lower portions of the sides, close to the outer rail, of the sliding frames, toothed belts are arranged on the inner sides of the sliding frames, a plurality of inner supporting wheels are arranged on the inner sides of the toothed belts, and the upper portions and the lower portions of middle shafts of the inner supporting wheels are slidably connected to the inner sides of the limiting grooves. According to the automatic feeding device, bamboo canes are continuously conveyed to different charcoal refining furnaces, the synchronous feeding requirement of the multi-batch charcoal refining furnaces is perfectly met, manual intervention is greatly reduced, the production continuity and the overall efficiency are remarkably improved, efficient and continuous feeding is achieved, and the automatic feeding device is suitable for multi-furnace cooperative production.

Description

Technical Field

[0001] This invention relates to the field of circular conveyor equipment, and more particularly to an automatic feeding device for bamboo charcoal production. Background Technology

[0002] In the bamboo charcoal production industry, traditional feeding methods have numerous drawbacks, severely restricting production efficiency and quality improvement. Previously, pre-packaged bamboo strips were mostly manually transported to the charcoal furnace. This not only consumed a large amount of manpower but also resulted in slow feeding speeds, making it difficult to meet the needs of multiple charcoal furnaces operating simultaneously, significantly reducing production continuity. Even production lines that introduced simple conveyor equipment had many problems. For example, conveyors often used a linear structure, which could not flexibly adapt to different layouts of charcoal furnaces. When dealing with multiple rows of charcoal furnaces, complex transfer devices were required. In the loading and unloading process, traditional equipment lacked precise control mechanisms, making it difficult to accurately adjust the feeding quantity according to production process requirements, easily leading to too many or too few bamboo strips being fed, affecting the stability of bamboo charcoal firing quality. Furthermore, traditional equipment lacked flexibility in station switching. Once the layout of the charcoal furnace changed, large-scale modifications to the conveyor equipment were required, which was time-consuming and labor-intensive. Therefore, we propose an automatic feeding device for bamboo charcoal production to solve the aforementioned problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing an automatic feeding device for bamboo charcoal production.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an automatic feeding device for bamboo charcoal production, comprising a ring rail, the ends of which are connected end-to-end by a connecting section, and guide chains provided inside both the ring rail and the connecting section. An outer rail is installed in the middle of the outer wall of the ring rail, and multiple release components are connected to the ring rail through the outer rail. Each release component includes a slide, and the upper and lower parts of the slide near the outer rail are provided with limit grooves. A toothed belt is provided on the inner side of each slide, and multiple inner support wheels are provided on the inner side of each toothed belt. The upper and lower parts of the central shaft of each inner support wheel are slidably connected to the inner side of the limit groove. A dual-head motor is installed inside the side closest to the outer rail. The drive end of each dual-head motor is fixedly connected to a threaded rod. The threaded rod is rotatably connected to the inside of the limiting groove. The upper threads of the threaded rods on both sides are symmetrical. The threaded rods are threadedly connected to the inner support wheel. A sliding frame is slidably connected to the middle of one side of the slide. An electric push rod is fixedly connected to the end of each sliding frame. The end of the electric push rod away from the sliding frame is fixedly connected to the slide. A stepper motor is installed on the top of each sliding frame. A drive wheel is installed on the bottom drive end of each stepper motor. The drive wheel is located inside the toothed belt.

[0005] Preferably, the top of the guide chain is provided with evenly distributed chain teeth, the top center of the connecting section has an opening, the inside of the opening is provided with a drive chain, the bottom of the drive chain meshes with the chain teeth on the guide chain, a reduction motor is installed on one side of the top of the connecting section, the drive end of the reduction motor is connected to the drive chain, and the reduction motor is used to drive the drive chain to work.

[0006] Preferably, multiple top frames are installed on the top of the ring track, and each top frame is fixedly connected to a vertical frame at the bottom center.

[0007] Preferably, electric slide rails are installed on both sides of the top of the slide, and a movable frame is connected to the top of the slide via the electric slide rails. The movable frame is slidably connected to the slide, and a servo motor is installed on the top of the movable frame.

[0008] Preferably, each of the servo motors is equipped with a drive wheel at its bottom drive end, one side of which is in contact with the inner wall of the outer rail, and each of the moving frames is provided with a guide wheel on one side of its lower part, the top of which is in contact with the lower part of the outer rail.

[0009] Preferably, the bottom of the ring rail and the connecting section are provided with slots, and multiple bottom blocks are installed at the bottom of the guide chain. Each bottom block is located inside the slot, and a connecting frame is installed at the bottom of each bottom block. Multiple support wheels are rotatably connected to the top two sides of the connecting frame, and the top of each support wheel is in contact with the bottom of the ring rail and the connecting section.

[0010] Preferably, each of the connecting frames has a fixing block installed at its bottom, a gear is rotatably connected to the lower outer periphery of each fixing block, a toothed column is fixedly connected to the bottom of each gear, side frames are fixedly connected to both sides of the outer periphery of each fixing block, and a bottom compartment is fixedly connected to the end of each side frame away from the fixing block.

[0011] Preferably, the bottom compartments are all located below the gears, and each bottom compartment has a slot in the middle of its bottom end. Each bottom compartment has a winding roller inside, and each winding roller has a toothed disc installed on one side of its middle section. One side of each toothed disc is meshed with a toothed column.

[0012] Preferably, gears are fixedly connected to both sides of the outer periphery of the winding roller, the bottom of each gear has a through slot, the bottom of each gear is provided with a pulley, and the bottom of each pulley is equipped with an electric gripper.

[0013] Preferably, an inner expansion clamp is installed in the middle of both sides of the bottom compartment, and the tensioning clamping part at the end of the inner expansion clamp is located inside the end of the winding roller.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In practical applications, this invention allows a ring conveyor structure to be installed between two rows of charcoal furnaces, enabling automated feeding of packaged bamboo strips. During operation, a geared motor drives the chain, and the meshing of the chain teeth drives the guide chain in a cyclical motion, thereby driving the entire conveying system to operate continuously. This design can continuously convey bamboo strips to different charcoal furnaces, perfectly adapting to the synchronous feeding requirements of multiple batches of charcoal furnaces, significantly reducing manual intervention, significantly improving production continuity and overall efficiency, achieving efficient continuous feeding, and adapting to multi-furnace collaborative production.

[0015] 2. During the feeding process, the servo motor drives the release component to move along the outer rail through the drive wheel. Combined with the electric slide rail driving the carriage to move horizontally, the toothed belt and gear can disengage, allowing the release component to enter a temporary "standby" state, which is convenient for quick transfer to the target position. This feature enables flexible switching between feeding and unloading positions, allowing the conveying device to accurately adapt to the layout differences of different charcoal furnaces. It can complete efficient docking without adjusting the furnace body position, greatly enhancing the equipment's scene adaptability, thereby enabling flexible switching of workstations and precise matching of furnace body layout.

[0016] 3. During the loading and unloading stage, after the release component is in place, it resets via an electric slide rail, causing the toothed belt and gears to re-engage. The stepper motor drives the toothed belt to rotate, which in turn drives the winding roller through gears, toothed columns, and toothed discs, thus controlling the lifting and lowering of the bamboo strips. Combined with the tightening and loosening of the electric grippers, precise feeding can be achieved at the charcoal furnace opening. More importantly, by using a dual-head motor to drive a threaded rod to adjust the position of the inner support wheel, and simultaneously coordinating with an electric push rod to move the drive wheel, the toothed belt undergoes adaptive deformation. This allows for precise control of the number of gears engaged simultaneously, achieving precise regulation of the bamboo strip feeding amount. Through intelligent control of the conveyor, precise quantitative operation is achieved, effectively ensuring the stability of the production process. Attached Figure Description

[0017] Figure 1 This is a frontal perspective three-dimensional structural diagram of an automatic feeding device for bamboo charcoal production according to the present invention; Figure 2 This is a partial structural diagram of the drive chain of an automatic feeding device for bamboo charcoal production according to the present invention; Figure 3 This is a partial structural diagram of the guide chain of an automatic feeding device for bamboo charcoal production according to the present invention. Figure 4 This is a partial structural diagram of the moving frame of an automatic feeding device for bamboo charcoal production according to the present invention; Figure 5 This is a partial structural diagram of the outer rail of an automatic feeding device for bamboo charcoal production according to the present invention; Figure 6 This is a partial structural diagram of the slide of an automatic feeding device for bamboo charcoal production according to the present invention; Figure 7This is a partial structural diagram of the bottom hopper of an automatic feeding device for bamboo charcoal production according to the present invention. Figure 8 This is a partial structural diagram of the electric gripper of an automatic feeding device for bamboo charcoal production according to the present invention.

[0018] 101. Circular rail; 102. Outer rail; 103. Connecting section; 104. Gear motor; 105. Drive chain; 106. Upright frame; 107. Pulley; 108. Top frame; 109. Carriage; 110. Stepper motor; 111. Opening; 112. Guide chain; 113. Base block; 114. Electric slide rail; 115. Moving frame; 116. Sliding frame; 117. Servo motor; 118. Drive wheel ; 119. Support wheel; 120. Connecting frame; 121. Base compartment; 122. Gear; 123. Guide wheel; 124. Electric gripper; 125. Side frame; 126. Groove; 127. Limiting groove; 128. Threaded rod; 129. Inner support wheel; 130. Electric push rod; 131. Gear disc; 132. Gear column; 133. Winding roller; 134. Inner expansion clamp; 135. Fixing block; 136. Toothed belt. Detailed Implementation

[0019] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] like Figures 1-8 An automatic feeding device for bamboo charcoal production is shown, including a ring rail 101. The ends of the ring rail 101 are connected end to end by a connecting section 103. Both the ring rail 101 and the connecting section 103 are provided with guide chains 112. The top of the guide chains 112 is provided with evenly distributed chain teeth. An opening 111 is opened in the middle of the top of the connecting section 103. A drive chain 105 is provided inside the opening 111. The bottom of the drive chain 105 meshes with the chain teeth on the guide chains 112. A reduction motor 104 is installed on one side of the top of the connecting section 103. The drive end of the reduction motor 104 is connected to the drive chain 105. The reduction motor 104 is used to drive the drive chain 105 to work. Multiple top frames 108 are installed on the top of the ring rail 101. Each top frame 108 is fixedly connected to a vertical frame 106 at the bottom center. An outer rail 102 is installed in the middle of the outer wall of the ring rail 101. Multiple release components are connected to the ring rail 101 through the outer rail 102. Furthermore, in practical implementation, a circular conveyor can be installed between two rows of charcoal furnaces, allowing the packaged bamboo strips to be fed and transported via the circular conveyor. During operation, starting the reduction motor 104 drives the drive chain 105 to work. The drive chain 105 can contact the chain teeth on the guide chain 112, causing the guide chain 112 to work in a cycle, thereby driving the circular conveyor to carry out cyclical transport. The operation of the circular conveyor can continuously transport the bamboo strips into different charcoal furnaces, realizing the feeding of multiple batches of charcoal furnaces and completing continuous feeding.

[0021] Each release component includes a slide 109. Limit grooves 127 are formed on the upper and lower parts of the slide 109 near the outer rail 102. A toothed belt 136 is provided inside each slide 109, and multiple inner support wheels 129 are provided inside each toothed belt 136. The upper and lower parts of the central shaft of each inner support wheel 129 are slidably connected to the inner side of the limit groove 127. A dual-head motor is installed inside each slide 109 near the outer rail 102. A threaded rod 128 is fixedly connected to the drive end of each dual-head motor, and the threaded rod 128 is rotatably connected to the limit groove 127. 27 Inside, the upper threads of the threaded rods 128 on both sides are symmetrical. The threaded rods 128 are threadedly connected to the inner support wheel 129. A sliding frame 116 is slidably connected to the middle of one side of the slide 109. An electric push rod 130 is fixedly connected to the end of the sliding frame 116. The end of the electric push rod 130 away from the sliding frame 116 is fixedly connected to the slide 109. A stepper motor 110 is installed on the top of the sliding frame 116. A drive wheel is installed on the bottom drive end of the stepper motor 110. The drive wheel is located inside the toothed belt 136. Furthermore, in practical implementation, during loading and unloading, after the release component moves into place, the electric slide rail 114 can be restarted. The electric slide rail 114 can drive the slide 109 to reset, allowing the toothed belt 136 to engage with the corresponding gear 122. Simultaneously, the dual-head motor and electric push rod 130 can be started. The dual-head motor can drive the threaded rod 128 to rotate, which in turn drives the inner support wheel 129 to move. At the same time, the electric push rod 130 can drive the slide frame 116 and the inner drive wheel to move synchronously, thereby causing the toothed belt 136 to deform. This allows for adjustment of the number of gears 122 that the toothed belt 136 can simultaneously engage with, which is beneficial for practical use.

[0022] Among them, electric slide rails 114 are installed on both sides of the top of the slide 109, and a movable frame 115 is connected to the top of the slide 109 through the electric slide rails 114. The movable frame 115 is slidably connected to the slide 109. A servo motor 117 is installed on the top of the movable frame 115. A drive wheel 118 is installed on the bottom drive end of the servo motor 117. One side of the drive wheel 118 is in contact with the inner side wall of the outer rail 102. A guide wheel 123 is provided on one side of the lower part of the movable frame 115. The top of the guide wheel 123 is in contact with the lower part of the outer rail 102. The bottom of the ring rail 101 and the connecting section 103 are provided with slots. Multiple bottom blocks 113 are installed on the bottom of the guide chain 112. The bottom blocks 113 are all located inside the slots. A connecting frame 120 is installed on the bottom of the bottom blocks 113. Multiple support wheels 119 are rotatably connected to both sides of the top of the connecting frame 120. The top of the support wheels 119 is in contact with the bottom of the ring rail 101 and the connecting section 103. Furthermore, in specific implementation, during material feeding, the servo motor 117 can be activated, which drives the drive wheel 118 to rotate. The drive wheel 118 drives the moving frame 115 and the slide 109 to move along the outer rail 102, allowing the release component to move along the outer rail 102. When the release component moves, the electric slide rail 114 drives the slide 109 to translate, allowing the toothed belt 136 on the inner side of the slide 109 to disengage from the gear 122, so that the release component can temporarily enter a "stopped" state for easy transfer. At this time, by controlling the position of the release component, the feeding position and the unloading position can be switched, so that the ring conveyor can be directly adapted to the layout of the carbon furnace, which is beneficial to practical use.

[0023] Each connecting frame 120 has a fixing block 135 installed at its bottom. Gears 122 are rotatably connected to the lower outer periphery of each fixing block 135. Gear pinions 132 are fixedly connected to the bottom of each gear 122. Side frames 125 are fixedly connected to both sides of the fixing block 135. A bottom chamber 121 is fixedly connected to the end of each side frame 125 away from the fixing block 135. Internal expansion clamps 134 are installed in the middle of both sides of the bottom chamber 121. The tensioning clamping parts at the ends of the internal expansion clamps 134 are located inside the ends of the winding rollers 133. Each compartment 121 is located below the gear 122. Each compartment 121 has a slot 126 at the bottom center. Each compartment 121 has a winding roller 133 inside. Each winding roller 133 has a gear disc 131 installed on one side of the middle. Each gear disc 131 is meshed with a gear post 132 on one side. Each winding roller 133 has a gear 122 fixedly connected to both sides of the outer periphery. Each gear 122 has a slot 126 through its bottom. Each gear 122 has a pulley 107 at its bottom. Each pulley 107 has an electric gripper 124 installed at its bottom. Furthermore, in specific implementation, the stepper motor 110 drives the toothed belt 136 to rotate. The cyclic rotation of the toothed belt 136 drives the gear 122 meshing with it to rotate. The gear 122 drives the toothed column 132 to rotate. The toothed column 132 drives the toothed disc 131 meshing with it to rotate. The toothed disc 131 drives the winding roller 133 to rotate synchronously. When the winding roller 133 rotates, it will wind or unwind the gear 122, thereby driving the bamboo strip at the bottom to rise or fall, which facilitates the subsequent feeding work. By controlling the operation of the electric gripper 124, the bamboo strip can be gripped or released. When the bamboo strip is transported to the charcoal furnace mouth by the ring conveyor, the bamboo strip can be placed into the charcoal furnace by releasing the electric gripper 124, thus completing the feeding work.

[0024] Working principle: In practical use, the circular conveyor can be installed between two rows of charcoal furnaces, allowing for the feeding and conveying of packaged bamboo strips. During operation, starting the geared motor 104 drives the drive chain 105, which in turn contacts the teeth on the guide chain 112. This causes the guide chain 112 to circulate, thus driving the circular conveyor for continuous transport. The circular conveyor can continuously transport bamboo strips to different charcoal furnaces, enabling multi-batch feeding and continuous feeding. During feeding, the servo motor 117 can be activated. The drive wheel 118 rotates, which in turn moves the movable frame 115 and the slide 109 along the outer rail 102. This allows the release assembly to move along the outer rail 102. During the movement of the release assembly, the electric slide rail 114 drives the slide 109 to translate, disengaging the toothed belt 136 on the inner side of the slide 109 from the gear 122. This temporarily puts the release assembly into a "stopped" state for easy transfer. Controlling the position of the release assembly allows for switching between the loading and unloading positions, enabling the circular conveyor to directly adapt to the layout of the carbon furnace, which is beneficial for practical use. During loading and unloading, the electric conveyor can be restarted after the release assembly has moved into position. The movable slide rail 114, via electric slide rail 114, can drive the slide frame 109 to reset, allowing the toothed belt 136 to engage with the corresponding gear 122. At this time, the stepper motor 110 drives the toothed belt 136 to rotate. The cyclic rotation of the toothed belt 136 drives the gear 122 to rotate, which in turn drives the toothed column 132 to rotate. The toothed column 132 drives the meshing toothed disc 131 to rotate, which in turn drives the winding roller 133 to rotate synchronously. When the winding roller 133 rotates, it winds or unwinds the gear 122, thereby causing the bamboo strip at the bottom to rise or fall, facilitating subsequent feeding. In the material feeding process, the electric gripper 124 can be controlled to grip or release the bamboo strips. When the bamboo strips are transported to the charcoal furnace opening by the circular conveyor, the bamboo strips can be placed into the charcoal furnace by releasing the electric gripper 124, thus completing the feeding process. During this process, the double-headed motor and the electric push rod 130 can be started simultaneously. The double-headed motor can drive the threaded rod 128 to rotate, and the threaded rod 128 can drive the inner support wheel 129 to move. At the same time, the electric push rod 130 can drive the sliding frame 116 and the inner drive wheel to move synchronously, thereby driving the toothed belt 136 to deform. This allows for adjustment of the number of gears 122 that the toothed belt 136 can simultaneously engage, which is beneficial for practical use.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An automatic feeding device for bamboo charcoal production, comprising a ring track (101), characterized in that: The ends of the ring rail (101) are connected end to end by a connecting section (103). Both the ring rail (101) and the connecting section (103) are provided with guide chains (112). An outer rail (102) is installed in the middle of the outer wall of the ring rail (101). The ring rail (101) is connected to multiple release components through the outer rail (102). Each release component includes a slide (109). The upper and lower parts of the slide (109) near the outer rail (102) are provided with limit grooves (127). The inner side of the slide (109) is provided with a toothed belt (136). The inner side of the toothed belt (136) is provided with multiple inner support wheels (129). The upper and lower parts of the central shaft of the inner support wheel (129) are slidably connected to the inner side of the limit groove (127). The inner side of the slide (109) near the outer rail (102) is provided with a toothed belt (136). Each is equipped with a dual-head motor, and the drive end of each dual-head motor is fixedly connected to a threaded rod (128). The threaded rod (128) is rotatably connected to the inside of the limiting groove (127). The upper threads of the threaded rods (128) on both sides are symmetrical. The threaded rods (128) are threadedly connected to the inner support wheel (129). A sliding frame (116) is slidably connected to the middle of one side of the slide frame (109). An electric push rod (130) is fixedly connected to the end of the sliding frame (116). The end of the electric push rod (130) away from the sliding frame (116) is fixedly connected to the slide frame (109). A stepper motor (110) is installed on the top of the sliding frame (116). An active wheel is installed on the bottom drive end of the stepper motor (110). The active wheel is located inside the toothed belt (136).

2. The automatic feeding device for bamboo charcoal production according to claim 1, characterized in that: The top of the guide chain (112) is provided with evenly distributed chain teeth. The top center of the connecting section (103) is provided with an opening (111). A drive chain (105) is provided inside the opening (111). The bottom of the drive chain (105) meshes with the chain teeth on the guide chain (112). A geared motor (104) is installed on one side of the top of the connecting section (103). The drive end of the geared motor (104) is connected to the drive chain (105). The geared motor (104) is used to drive the drive chain (105) to work.

3. The automatic feeding device for bamboo charcoal production according to claim 1, characterized in that: The top of the ring rail (101) is equipped with multiple top frames (108), and each top frame (108) is fixedly connected to a vertical frame (106) at the bottom center.

4. The automatic feeding device for bamboo charcoal production according to claim 1, characterized in that: Electric slide rails (114) are installed on both sides of the top of the slide (109). A movable frame (115) is connected to the top of the slide (109) via the electric slide rails (114). The movable frame (115) is slidably connected to the slide (109). A servo motor (117) is installed on the top of the movable frame (115).

5. An automatic feeding device for bamboo charcoal production according to claim 4, characterized in that: Each of the servo motors (117) has a drive wheel (118) installed at the bottom drive end. One side of each drive wheel (118) is in contact with the inner wall of the outer rail (102). Each of the moving frames (115) has a guide wheel (123) on one side of its lower part. The top of each guide wheel (123) is in contact with the lower part of the outer rail (102).

6. The automatic feeding device for bamboo charcoal production according to claim 5, characterized in that: The bottom of the ring rail (101) and the connecting section (103) are both provided with slots. Multiple bottom blocks (113) are installed at the bottom of the guide chain (112). The bottom blocks (113) are all located inside the slots. A connecting frame (120) is installed at the bottom of each bottom block (113). Multiple support wheels (119) are rotatably connected to the top two sides of the connecting frame (120). The tops of the support wheels (119) are in contact with the bottom of the ring rail (101) and the connecting section (103).

7. An automatic feeding device for bamboo charcoal production according to claim 6, characterized in that: Each of the connecting frames (120) has a fixing block (135) installed at the bottom. Each fixing block (135) has a gear (122) rotatably connected to the lower outer periphery of the fixing block (135). Each gear (122) has a toothed column (132) fixedly connected to the bottom of the gear (122). Each fixing block (135) has a side frame (125) fixedly connected to both sides of the outer periphery of the fixing block (135). Each side frame (125) has a bottom compartment (121) fixedly connected to the end away from the fixing block (135).

8. An automatic feeding device for bamboo charcoal production according to claim 7, characterized in that: The bottom compartments (121) are all located below the gears (122). The bottom end of each bottom compartment (121) has a slot (126) in the middle. The inner side of each bottom compartment (121) is provided with a winding roller (133). A toothed disc (131) is installed on one side of the middle of each winding roller (133). One side of each toothed disc (131) is meshed with a toothed column (132).

9. An automatic feeding device for bamboo charcoal production according to claim 8, characterized in that: Gears (122) are fixedly connected to both sides of the outer periphery of the winding roller (133). The bottom of each gear (122) passes through a slot (126). A pulley (107) is provided at the bottom of each gear (122). An electric gripper (124) is installed at the bottom of each pulley (107).

10. An automatic feeding device for bamboo charcoal production according to claim 9, characterized in that: The bottom compartment (121) is equipped with an inner expansion clamp (134) in the middle of both sides, and the tension clamping part at the end of the inner expansion clamp (134) is located inside the end of the winding roller (133).

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