A material collecting mechanism for glass laser dicing processing
Patent Information
- Application Number
- CN202522313443.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-10-31
AI Technical Summary
玻璃经激光切割裂片后，表面易附着细小玻璃碎屑，现有生产线多采用固定式毛刷或单一负压吸尘装置清理，毛刷长期使用易磨损，清洁效果随使用时间下降；单一负压吸尘难以清除附着在输送带缝隙或玻璃边角的碎屑，残留碎屑易划伤玻璃表面或影响后续镀膜、贴合等工序的加工精度，导致产品报废率升高，部分生产线虽增设振动除尘机构，但振动组件多为统一力度设计，统一力度的振动易导致间隙较大区域清洁不彻底、间隙较小区域输送带过度磨损，甚至因振动幅度过大导致玻璃晃动，影响切割精度
本实用新型设计的振动除尘组件中扭簧弹性系数及执行振动爪角度沿倾斜方向梯度递增，适配输送带与安装支架的间隙变化，既避免间隙大区域清洁不彻底，又防止间隙小区域过度振动导致的输送带磨损，控制支链与输送辊联动实现间歇振动，无需额外动力源，简化结构并降低能耗；可拆卸收集框实现废料自动化收集，减少人工清理频率；
Smart Images
Figure CN224812461U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of glass laser processing equipment technology, specifically to a material collection mechanism for glass laser dicing processing. Background Technology
[0002] In the glass processing industry, laser cutting and dicing technology is widely used in the processing of products such as mobile phone screens, tablet computer panels, and photovoltaic glass. With the rapid development of the consumer electronics and new energy industries, the market has placed higher demands on the automation level, production efficiency, and product quality of glass processing. Currently, existing glass laser cutting and sharding production lines still have the following technical defects. After glass is laser-cut and shattered, fine glass fragments easily adhere to its surface. Existing production lines mostly use fixed brushes or single negative pressure dust collection devices for cleaning. Brushes are prone to wear and tear after long-term use, and their cleaning effect decreases over time. Single negative pressure dust collection is insufficient to remove fragments attached to the gaps in the conveyor belt or the edges of the glass. Residual fragments can easily scratch the glass surface or affect the processing accuracy of subsequent coating, bonding, and other processes, leading to an increased product scrap rate. Although some production lines have added vibration dust removal mechanisms, the vibration components are mostly designed with uniform force. Uniform vibration can easily lead to incomplete cleaning in areas with larger gaps, excessive wear on the conveyor belt in areas with smaller gaps, and even cause the glass to shake due to excessive vibration amplitude, affecting the cutting accuracy.
[0003] In conclusion, there is an urgent need to design an adaptive vibration dust removal and high-efficiency dust collection laser processing mechanism to address the shortcomings of existing technologies and improve the stability, efficiency, and product quality of glass processing. Summary of the Invention
[0004] The first technical problem to be solved This invention can solve the technical problems existing in the above-mentioned glass laser cleaving process.
[0005] Technical solution To achieve the above objectives, the present invention adopts the following technical solution: a material collection mechanism for glass laser cleaving processing, comprising a mounting base, on which a laser cleaving machine is fixedly mounted, and a conveying module is also configured on the mounting base. The conveying module extends horizontally from left to right through the processing area of the laser cleaving machine, and a collection frame for receiving waste material is detachably provided on the mounting base located on one side of the output end of the conveying module; the conveying module includes a fixed frame fixed on the mounting base, which extends horizontally from right to left through the processing area of the laser cleaving machine, and its left end is fixedly connected to the mounting base; a conveying assembly is assembled between the fixed frames, and a vibration dust removal assembly is configured on the left side of the fixed frame. The component forms intermittent contact with the conveying component during operation; the fixed frame is also equipped with a guide tensioning component, which is used to cooperate with the conveying component to assist the vibration dust removal component in performing its operation. The conveying component includes two conveying rollers fixed between the inner walls of the fixed frame by bearings, and the two conveying rollers are symmetrically distributed along the horizontal direction of the fixed frame; a guide roller is provided on the right side of the fixed frame, and the guide roller is located below the conveying rollers to the right. The conveying rollers and the guide rollers are connected by a conveyor belt. A conveyor motor is provided on the fixed frame, and the output shaft of the conveyor motor is connected to the conveying rollers through a coupling; support rollers are also evenly distributed between the inner walls of the fixed frame, and the support rollers are located within the gaps of the conveyor belt and are in contact with the inner wall of the conveyor belt. The guiding tensioning assembly includes guide brackets symmetrically fixed to the front and rear sides of the fixed frame along its central axis. Each guide bracket has a guide groove, and a guide block adapted to the guide groove is slidably fitted in the guide groove. A tensioning bracket is fixedly connected between the two guide blocks, and a tensioning roller is rotatably connected to the tensioning bracket. A guide roller is also fixedly mounted on the fixed frame. The central axis of the guide roller and the central axis of the tensioning roller are coplanar in the same vertical plane in the initial state, and the vertex of the upper end of the guide roller and the vertex of the lower end of the conveying roller are coplanar in the same horizontal plane.The vibratory dust removal assembly includes a mounting bracket inclinedly disposed between the inner walls of a fixed frame. The gap between the conveyor belt (located between the conveyor roller and the guide roller) and the mounting bracket increases linearly downwards along the inclined direction. The mounting bracket has uniformly spaced mounting grooves along its inclined direction, and each groove contains a vibrating rod mounted via a torsion spring. The elastic coefficient of the torsion springs in each groove increases sequentially downwards along the inclined direction. The vibrating rods have uniformly spaced vibrating claws along their length. Initially, the vibrating claws abut against the surface of the conveyor belt under the preload of the torsion springs. As the gap between the conveyor belt and the mounting bracket increases downwards along the inclined direction, the connection angle between the vibrating claws and the vibrating rods increases sequentially. A control frame is slidably mounted on the mounting bracket, and drive rods are uniformly spaced on the control frame. Adjacent drive rods form a control mechanism that cooperates with the mounting grooves. The control slot is formed, and the vibrating claw is located inside the control slot. A horizontal plate is provided on the inner wall of the mounting bracket, and a return spring rod is provided on the horizontal plate. The return spring rod is connected to the control frame. A control branch connected to the control frame is provided on the fixed frame. The control branch is connected to the conveyor roller located on the right side of the fixed frame. The control branch includes drive gears symmetrically arranged on the conveyor roller on the right side of the fixed frame. The fixed frame is provided with mounting columns corresponding to the drive gears through bearings. Speed-increasing gears and drive discs are arranged sequentially on the mounting columns. The speed-increasing gears mesh with the drive gears for transmission. The fixed frame is provided with sliding grooves symmetrically opened at the front and rear. A sliding frame is provided in the sliding groove. The sliding frame is connected to the control frame and is slidably connected to the drive disc. Preferably, a dust collection frame that fits against the surface of the conveyor belt is provided at the lower right end of the fixed frame. The dust collection frame is connected to an existing vacuum cleaner through a dust collection pipe. Three beneficial effects In this invention, the elastic coefficient of the torsion spring and the angle of the vibrating claw increase gradually along the inclined direction to adapt to the changes in the gap between the conveyor belt and the mounting bracket. This avoids incomplete cleaning in areas with large gaps and prevents wear on the conveyor belt caused by excessive vibration in areas with small gaps. The control chain and conveyor roller are linked to achieve intermittent vibration, eliminating the need for an additional power source, simplifying the structure and reducing energy consumption. The detachable collection frame enables automated waste collection, reducing the frequency of manual cleaning. The guide tensioning component involved in this utility model works in conjunction with the vibration component to ensure that the vibration dust removal is thorough and efficient; at the same time, it reduces the wear of the vibration component, extends its service life, and prevents the glass from shaking, thus balancing the dust removal effect and processing accuracy, and ensuring the stability of subsequent processes. Attached Figure Description
[0006] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0007] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a first structural diagram of the mounting base plate, conveying module and collection frame of this utility model; Figure 4 This is a schematic diagram of the second structure between the mounting base plate, the conveying module, and the collection frame of this utility model; Figure 5 This is a utility model Figure 2 A magnified view of part A; Figure 6 This is a utility model Figure 4 A magnified view of section B. Detailed Implementation
[0008] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.
[0009] like Figure 1-6 As shown, a material collection mechanism for glass laser cleaving includes a mounting base 1, on which a laser cleaving machine 2 is fixedly mounted. A conveying module 3 is also disposed on the mounting base 1. The conveying module 3 extends horizontally from left to right through the processing area of the laser cleaving machine 2, and a collection frame 4 for receiving waste material is detachably provided on the mounting base 1 located on the output end side of the conveying module 3. The processing area of the laser cleaving machine 2 is aligned with the conveying path of the conveying module 3. The glass to be processed is conveyed horizontally from left to right by the conveying module 3. When the glass enters the processing area of the laser cleaving machine 2, the laser cleaving machine 2 starts the cutting and cleaving operation according to the preset parameters. After processing, the glass continues to be conveyed by the conveying module 3 to the subsequent process. The finished glass is transferred to the next process through existing equipment. The scraps and broken waste generated after the glass is laser cut and cleaved are moved to the output end by the conveyor belt of the conveying module 3 and fall naturally into the collection frame 4 under the action of gravity. When the collection frame is full or needs to be cleaned, it can be quickly disassembled and replaced without stopping the machine to dismantle the main structure of the production line. This realizes the integrated automatic processing operation of glass laser cleaving, including conveying, cleaving, and waste collection, which improves the accuracy and processing efficiency of glass laser cleaving. The conveying module 3 includes a fixed frame 31 fixed on the mounting base plate 1. The fixed frame 31 extends horizontally from right to left through the processing area of the laser dicing machine 2, and its left end is fixedly connected to the mounting base plate 1. A conveying assembly 32 is assembled between the fixed frames 31. A vibration dust removal assembly 33 is arranged on the left side of the fixed frame 31. The vibration dust removal assembly 33 forms intermittent contact with the conveying assembly 32 during operation. A guide tensioning assembly 34 is also provided on the fixed frame 31. The guide tensioning assembly 34 is used to cooperate with the conveying assembly 32 to assist the vibration dust removal assembly 33 in performing its operation.
[0010] When operating using the above technical solution, the conveyor motor in the conveyor assembly 32 drives the conveyor roller 321 to rotate, causing the conveyor belt 323 to run horizontally. The glass to be processed is placed on the conveyor belt 323 from the left side of the fixed frame 31. Moving from left to right with the conveyor belt, it precisely enters the processing area of the laser cleaving machine 2 for cutting. The glass is then conveyed to subsequent processes by the conveyor belt 323, achieving continuous and directional glass transport. Finished glass is transferred to the next processing step using existing equipment. When the conveyor belt 323 passes through the area of the vibration dust removal assembly 33, the vibration dust removal assembly 33 uses an intermittent "contact-detach-re-contact" action on the surface of the conveyor belt, utilizing the impact force generated by intermittent vibration to shake off waste and small debris generated by laser cutting on the surface of the conveyor belt 323. This prevents debris residue from affecting subsequent processing, allowing waste to fall into the collection frame 4. The vibration dust removal assembly 33 and the conveyor assembly 32... The intermittent contact design uses vibration and impact to clean debris from the surface of the conveyor belt 323, avoiding excessive wear caused by continuous contact. Simultaneously, the guide tensioning assembly 34 ensures stable conveying, allowing the vibrating claws 335 of the vibrating dust removal assembly 33 to act evenly on the surface of the conveyor belt 335, eliminating cleaning dead zones and effectively protecting the glass surface quality. Furthermore, the guide tensioning assembly 34 can adjust the tension of the conveyor belt 323 during operation, preventing speed fluctuations or deviations caused by long-term slackness, effectively extending the equipment's service life.
[0011] The conveying assembly 32 includes two conveying rollers 321 fixed between the inner walls of the fixed frame 31 by bearings. The two conveying rollers 321 are symmetrically distributed along the horizontal direction of the fixed frame 31. A guide roller 322 is provided on the right side of the fixed frame 31. The guide roller 322 is located below the conveying rollers 321 to the right. The conveying rollers 321 and the guide roller 322 are connected by a conveyor belt 323. A conveying motor is provided on the fixed frame. The output shaft of the conveying motor is connected to the conveying rollers 321 by a coupling. Support rollers 324 are also evenly distributed between the inner walls of the fixed frame 31. The support rollers 324 are located in the gaps of the conveyor belt 323 and are in contact with the inner wall of the conveyor belt 323.
[0012] By adopting the above technical solution, after the conveyor motor starts, the two conveyor rollers 321 rotate and the guide rollers cooperate to drive the conveyor belt 323 to run synchronously, forming the power basis for glass transmission. The support roller 324 can support the conveyor belt 323 to prevent it from sagging due to the weight of the glass, ensuring that the conveyor belt 323 always maintains a stable transmission plane, and finally realizes the orientation and stable transmission of the glass to be processed along the conveyor belt 323 to the processing area of the laser cleaving machine 2, as well as the subsequent transmission of the processed glass. The guide tensioning assembly 34 includes guide brackets 341 symmetrically fixed to the front and rear sides of the fixed frame 31 along its central axis. Each guide bracket 341 has a guide groove 342. A guide block 343 adapted to the guide groove 342 is slidably fitted in the guide groove 342. A tensioning spring rod 347 is provided between the guide block 343 and the inner wall of the guide groove 342. A tensioning bracket 344 is fixedly connected between the two guide blocks 343. A tensioning roller 345 is rotatably connected to the tensioning bracket 344. A guide roller 346 is also fixedly provided on the fixed frame 31. The central axis of the guide roller 346 and the central axis of the tensioning roller 345 are coplanar in the same vertical plane in the initial state. The vertex of the upper end of the guide roller 346 and the vertex of the lower end of the conveying roller 321 are coplanar in the same horizontal plane.
[0013] By adopting the above technical solution, when the conveyor belt 323 becomes slack during operation, the tension spring rod 347 can push the guide block 343 to slide along the guide groove 342, and the tension bracket 344 will synchronously drive the rotating tension roller 345 to move. By adjusting the position of the tension roller 345, its contact pressure on the conveyor belt 323 can be changed, thereby realizing the adjustment of the tension of the conveyor belt 323. Moreover, the stable operating state of the conveyor belt 323 can make the vibrating claw 335 of the vibrating dust removal component 33 evenly contact the surface of the conveyor belt 323, ensuring that the vibration dust removal effect is uniform and thorough, avoiding dust removal dead angles or excessive wear caused by the shaking of the conveyor belt 323, and ensuring the efficiency of debris cleaning. The vibratory dust removal assembly 33 includes a mounting bracket 331 inclinedly disposed between the inner walls of the fixed frame 31. The gap between the conveyor belt 323 located between the conveyor roller 321 and the guide roller 322 and the mounting bracket 331 increases linearly downwards along the inclined direction. This provides a basis for subsequent "gradient vibration," ensuring that the vibration assembly can adapt to the natural shape of the conveyor belt 323 and avoiding excessively large gaps that may lead to cleaning omissions or excessively small gaps that may lead to component collisions. The mounting bracket 331 is evenly provided with mounting grooves 332 along its inclined direction. Each mounting groove 332 is provided with a vibrating rod 334 through a torsion spring. Along the inclined downward direction, the elastic coefficient of the torsion spring in each mounting groove 332 increases sequentially. The larger the gap, the stronger the elasticity of the torsion spring, which can provide a greater restoring force, ensuring that the vibrating claw 335 can effectively abut against the surface of the conveyor belt 323 and avoiding the inability of the vibrating claw to contact the conveyor belt 323 due to large gaps. Vibrating rods 334 are uniformly provided with vibrating claws 335 along their length. In the initial state, the vibrating claws 335 abut against the surface of the conveyor belt 323 under the preload of the torsion spring, forming a "full-area coverage" contact state, laying the foundation for subsequent intermittent vibration. As the gap between the conveyor belt 323 and the mounting bracket 331 increases downward along the inclination, the connection angle between the vibrating claws 335 and the vibrating rod 334 on each vibrating rod 334 increases accordingly. The angle adjustment ensures that each vibrating claw 335 can abut against the surface of the conveyor belt 323 in a direction perpendicular to it, avoiding "side rubbing" of the vibrating claws 335 due to the inclination of the conveyor belt 323, and improving the effectiveness of contact.A control frame 336 is slidably mounted on the mounting bracket 331. Drive rods 337 are evenly distributed on the control frame 336, forming a control groove between adjacent drive rods 337 that mates with the mounting groove 332. An actuating vibration claw 335 is located inside the control groove. A horizontal plate is provided on the inner wall of the mounting bracket 331, and a return spring rod 339 is provided on the horizontal plate, connected to the control frame 336. A control branch 338 connected to the control frame 336 is provided on the fixed frame 31. The control branch 338 is connected to the conveyor roller 321 located on the right side of the fixed frame 31. The control branch 338 includes drive gears 3381 symmetrically arranged on the conveyor roller 321 on the right side of the fixed frame 31. The fixed frame 31... The bearing is provided with a mounting post 3382 corresponding to the drive gear 3381. A speed-increasing gear 3383 and a drive disk 3384 are sequentially arranged on the mounting post 3382. A cam-shaped groove is opened in the drive disk 3384. The speed-increasing gear 3383 meshes with the drive gear 3381 for transmission. The fixed frame 31 is provided with sliding grooves 3385 symmetrically arranged front and rear. A sliding frame 3386 is arranged in the sliding groove 3385. The sliding frame 3386 is connected to the control frame 336 and is slidably connected to the drive disk 3384. The reset spring rod 339 is connected to the control frame 336. The sliding frame 3386 cooperates with the control frame 336 and the drive disk 3384 to realize the intermittent contact action of the vibrating claw 335.
[0014] Using the above technical solution, when the conveying roller 321 rotates, the drive gears 3381 symmetrically arranged at both ends rotate synchronously. The number of teeth of the speed-increasing gear 3383 is less than the number of teeth of the drive gear. The rotation speed of the drive gear 3381 can increase the rotation of the drive disk 3384 through the cooperation of the speed-increasing gear 3383, thereby increasing the frequency of the reciprocating motion of the control frame 336 and increasing the vibration frequency of the vibrating claw 335, thereby improving the effect of chip shaking.
[0015] When the drive disc 3384 starts to rotate, the vibrating rod 334 is reciprocated by the cooperation between the sliding frame 3386, the control frame 336, and the return spring rod 339. Under the coordinated drive of the torsion spring and the control frame 336, the vibrating rod 334 repeatedly performs intermittent actions of disengaging from and impacting the conveyor belt 323 with the waiting vibrating claw 335. Through high-frequency intermittent vibration, the cutting debris on the surface of the glass and the conveyor belt 323 is shaken off. A dust collection frame is provided on the lower right side of the fixed frame 31, which is in contact with the surface of the conveyor belt. The dust collection frame is connected to an existing vacuum cleaner through a dust collection pipe. For small debris that cannot be completely shaken off by the vibration dust removal component 33 and is still slightly attached to the surface of the conveyor belt 323, the negative pressure adsorption of the dust collection frame can perform secondary cleaning to ensure that the surface of the conveyor belt 323 is clean and to prevent residual debris from scratching the glass to be processed later.
[0016] During operation, the conveyor motor drives the conveyor roller 321 to rotate via a coupling. The glass is then transported from left to right via the conveyor belt 323 and guide roller 322. Support roller 324 ensures smooth operation of the conveyor belt. The glass enters the processing area of the laser cleaving machine 2 along with the conveyor belt. After laser cutting and cleaving, it continues to be conveyed to the right. The finished glass is transferred to the next processing step via existing equipment. The vibration dust removal component 33 is linked to the conveyor roller 321 via a control chain 338, driving the vibrating claw 335 to intermittently vibrate the conveyor belt and glass surface, shaking off the cutting debris. The gradient-designed torsion springs and vibrating claws ensure a clean area. The dust collection frame on the right side of the fixed frame 31 uses negative pressure to collect the shaken debris again, sending it to the vacuum cleaner via a suction pipe. The guide tensioning component 34 adjusts the conveyor belt tension and prevents deviation via tension roller 345 and guide roller 346, ensuring stable conveying and effective vibration and dust collection. Large pieces of waste generated during processing are output via conveyor belt and fall into the detachable collection frame 4 on the mounting base plate 1, realizing waste classification collection and convenient cleaning.
[0017] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A material collection mechanism for laser glass dicing, comprising a mounting base plate on which a laser dicing machine is fixedly mounted, characterized in that, The mounting base plate is also equipped with a conveying module, which runs horizontally from left to right through the processing area of the laser dicing machine, and a collection frame for receiving waste is detachably provided on the mounting base plate located on the output end side of the conveying module. The conveying module includes a fixed frame fixed on a mounting base. The fixed frame extends horizontally from right to left through the processing area of the laser dicing machine, and its left end is fixedly connected to the mounting base. A conveying assembly is assembled between the fixed frames. A vibration dust removal assembly is arranged on the left side of the fixed frame. The vibration dust removal assembly makes intermittent contact with the conveying assembly during operation. A guide tensioning assembly is also provided on the fixed frame. The guide tensioning assembly is used to cooperate with the conveying assembly to assist the vibration dust removal assembly in performing its operation.
2. The material collection mechanism for glass laser dicing according to claim 1, characterized in that, The conveying assembly includes two conveying rollers fixed between the inner walls of the fixed frame by bearings, and the two conveying rollers are symmetrically distributed along the horizontal direction of the fixed frame; a guide roller is provided on the right side of the fixed frame, and the guide roller is located below the conveying rollers to the right, and the conveying rollers and the guide rollers are connected by a conveyor belt.
3. The material collection mechanism for glass laser dicing according to claim 2, characterized in that, Support rollers are evenly distributed between the inner walls of the fixed frame. The support rollers are located within the gaps of the conveyor belt and are attached to the inner wall of the conveyor belt.
4. The material collection mechanism for glass laser dicing according to claim 1, characterized in that, The guide tensioning assembly includes guide brackets symmetrically fixed to the front and rear sides of the fixed frame along the central axis. Each guide bracket has a guide groove, and a guide block adapted to the guide groove is slidably fitted in the guide groove. A tensioning bracket is fixedly connected between the two guide blocks, and a tensioning roller is rotatably connected to the tensioning bracket.
5. The material collection mechanism for glass laser dicing according to claim 4, characterized in that, The fixed frame is also fixed with a guide roller. The central axis of the guide roller and the central axis of the tension roller are coplanar in the same vertical plane in the initial state, and the apex of the guide roller and the apex of the conveying roller are coplanar in the same horizontal plane.
6. The material collection mechanism for glass laser dicing according to claim 1, characterized in that, The vibration dust removal assembly includes a mounting bracket inclinedly disposed between the inner walls of the fixed frame, and the gap between the conveyor belt located between the conveyor roller and the guide roller and the mounting bracket increases linearly in the downward inclined direction; The mounting bracket has mounting slots evenly spaced along its inclined direction. Each mounting slot contains a vibrating rod installed through a torsion spring. The elastic coefficient of the torsion spring in each mounting slot increases sequentially along the downward inclined direction. The vibrating rod is uniformly provided with vibrating claws along its length. In the initial state, the vibrating claws abut against the surface of the conveyor belt under the preload of the torsion spring. A control frame is slidably mounted on the mounting bracket. A horizontal plate is mounted on the mounting bracket, and a reset spring rod is installed between the horizontal plate and the control frame. A control groove that mates with the mounting groove is opened on the control frame. The vibrating claw is located inside the control groove. A control chain connected to the control frame is mounted on the fixed frame. The control chain is connected to the conveyor roller located on the right side of the fixed frame.
7. The material collection mechanism for glass laser dicing according to claim 6, characterized in that: The control chain includes drive gears symmetrically arranged on the right conveyor roller of the fixed frame. The fixed frame is equipped with mounting columns corresponding to the drive gears via bearings. Speed-increasing gears and drive discs are sequentially arranged on the mounting columns. The speed-increasing gears mesh with the drive gears for transmission. The fixed frame is symmetrically provided with sliding grooves at the front and back. Sliding frames are arranged in the sliding grooves. The sliding frames are connected to the control frame and are slidably connected to the drive discs.