A double-outlet tablet press with an automatic feeding module

Abstract

The present invention discloses a double-outlet tablet press with an automatic feeding module, which includes a frame and a feeding unit; Frame: A mold is provided at the lower end inside it, and ejector blocks are symmetrically and slidably connected inside the mold. The upper end of the frame is rotatably connected with a crankshaft through a bearing. Connecting rods are symmetrically and rotatably connected to the outer arc surface of the crankshaft. Pressure columns are slidably connected inside the guiding holes of the middle cross beam of the frame. The lower ends of the connecting rods are respectively rotatably connected to the vertically corresponding pressure columns through pin shafts. Both ends of the crankshaft extend out of the outer surface of the frame. A reduction motor is provided on the right side surface of the upper end of the frame, and the output shaft of the reduction motor is fixedly connected to the right end of the crankshaft. Driving synchronous belt wheels are symmetrically provided at the left end of the crankshaft; Feeding unit: Arranged at the rear end of the frame, the transmission gear and the mold are both arranged in cooperation with the feeding unit; Among them: It also includes a control switch. This double-outlet tablet press with an automatic feeding module has high processing efficiency, is simple to use and convenient to control.

Description

Technical Field

[0001] The present invention relates to the technical field of tablet presses, and specifically relates to a double-outlet tablet press with an automatic feeding module. Background Art

[0002] With the continuous development of domestic pharmaceutical enterprises, the functional requirements for pharmaceutical machinery by each pharmaceutical enterprise are increasing. Especially when many pharmaceutical enterprises are developing new products, the output requirements are not large, but they pursue novelty, uniqueness, and specialness in tablet types. Therefore, the demand for small tablet presses is increasing continuously, and the functional requirements for tablet presses are also constantly improving. In the prior art: The patent with the authorized publication number CN211567046U discloses a small double-outlet tablet press, including a platform. A lower bracket is installed on the lower wall surface of the platform, and a support column is installed on the upper wall surface of the platform. A top plate is installed on the support column. By controlling the main pressure and filling amount through a servo motor, the function of double-layer tablet pressing is achieved on a small tablet pressing device, increasing the functionality of the device and having a good use effect. However, by controlling the feeding through a servo motor, the electrical components are complex to control and the equipment cost is high. For this reason, we propose a double-outlet tablet press with an automatic feeding module. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects, and provide a double-outlet tablet press with an automatic feeding module, which has high processing efficiency, is simple to use and convenient to control, and can effectively solve the problems in the background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A double-outlet tablet press with an automatic feeding module, including a frame and a feeding unit;

[0005] Frame: A mold is provided at the lower end inside it. Pushing blocks are symmetrically and slidably connected inside the mold. The upper end of the frame is rotatably connected with a crankshaft through a bearing. Connecting rods are symmetrically and rotatably connected to the outer arc surface of the crankshaft. Pressure columns are slidably connected inside the guiding holes of the middle cross beam of the frame. The lower ends of the connecting rods are respectively rotatably connected to the vertically corresponding pressure columns through pin shafts. Both ends of the crankshaft extend out of the outer surface of the frame. A reduction motor is provided on the right side surface of the upper end of the frame. The output shaft of the reduction motor is fixedly connected to the right end of the crankshaft. Synchronous drive pulleys are symmetrically provided at the left end of the crankshaft;

[0006] Feeding unit: It is arranged at the rear end of the frame, and the synchronous drive pulley and the mold are both cooperatively arranged with the feeding unit;

[0007] Among them: It also includes a control switch which is arranged on the right side of the frame. The input end of the reduction motor is electrically connected to the output end of the control switch, and the input end of the control switch is electrically connected to an external power supply. The crankshaft can drive two pressing columns to move in opposite directions through two connecting rods. Thus, the processing can be achieved once every half rotation of the crankshaft. At the same time, it can automatically feed in a fixed quantity and automatically discharge the processed materials, thereby greatly improving the processing efficiency. Meanwhile, it is convenient to use, simple to control, and has a small production cost.

[0008] Furthermore, the feeding unit includes a support pipe, a storage hopper, and a feeding roller. The support pipe is arranged at the rear end of the frame. Storage hoppers are provided at the feeding ports on the outer arc surface of the support pipe. The discharge pipes arranged at the discharge ports on the outer arc surface of the support pipe all extend into the interior of the mold. The feeding roller is rotatably connected to the rear end of the frame through a bearing. The middle part of the outer arc surface of the feeding roller is rotatably connected to the inner arc surface of the support pipe. Grooves are staggeredly arranged on the outer arc surface of the feeding roller. The left end of the feeding roller extends out of the left side surface of the frame, which is convenient for quantitative feeding.

[0009] Furthermore, the feeding unit also includes a feeding synchronous belt pulley which is arranged at the left end of the feeding roller. The feeding roller is driven by a first synchronous belt to be in transmission connection with the transmission synchronous belt pulley on the right side, which is convenient for synchronous driving of the feeding roller.

[0010] Furthermore, a synchronous shaft is rotatably connected to the lower end of the frame through a bearing. The middle part of the outer arc surface of the synchronous shaft penetrates through the mold. Cam wheels are arranged in a staggered manner on the outer arc surface of the synchronous shaft. The cam wheels are respectively arranged in cooperation with the adjacent material ejecting blocks, which is convenient for ejecting the materials.

[0011] Furthermore, the left end of the synchronous shaft extends out of the left side surface of the frame and a material ejecting synchronous belt pulley is arranged at the end. The material ejecting synchronous belt pulley is in transmission connection with the transmission synchronous belt pulley on the left side through a second synchronous belt, which is convenient for synchronous driving of the material ejecting blocks.

[0012] Furthermore, a rack is slidably connected inside the chute on the upper surface of the mold. Push blocks are symmetrically arranged on the rear side surface of the rack, which is convenient for pushing the materials.

[0013] Furthermore, a sector gear is rotatably connected to the front side surface of the middle cross beam of the frame through a rotating shaft. The sector gear is in meshing connection with the rack. A guide wheel is arranged in the middle of the outer arc surface of the crankshaft. The guide chute on the outer arc surface of the guide wheel is slidably connected to the guide post at the upper end of the sector gear, which is convenient for synchronous driving of the rack.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The double-discharge tablet press with an automatic feeding module has the following advantages:

[0015] 1. Adjust the control switch to make the reduction motor operate. The output shaft of the reduction motor drives the crankshaft to rotate clockwise. The crankshaft drives two transmission synchronous belt wheels to rotate. At the same time, the axes at both ends of the crankshaft are misaligned with the axes at the joints of the connecting rods. When the crankshaft rotates, it rotates relative to the upper end of the connecting rod. Furthermore, the crankshaft drives the pressing column to slide along the guiding hole of the middle crossbeam of the frame through the connecting rod. At the same time, the lower end of the connecting rod slides relative to the upper end of the pressing column. Thus, the pressing column moves downward to extrude the material. Then, the powdery material is extruded into flakes under the support of the top block. Then, as the crankshaft continues to rotate, the pressing column will move upward. The crankshaft can drive two pressing columns to move in opposite directions through two connecting rods. Thus, the processing can be completed once every half rotation of the crankshaft, greatly improving the processing efficiency. At the same time, the required power source is small, and the production cost is low.

[0016] 2. The transmission synchronous belt wheel on the right drives the feeding synchronous belt wheel to rotate through the first synchronous belt. The feeding synchronous belt wheel drives the feeding roller to rotate. When the groove on the outer arc surface of the feeding roller corresponds to the feeding hole on the outer arc surface of the support pipe, the material inside the storage hopper will fall into the groove on the outer arc surface of the feeding roller. Then, as the feeding roller rotates, the feeding roller drives the material to move. Then, when the groove on the outer arc surface of the feeding roller corresponds to the discharge port on the outer arc surface of the support pipe, the material passes through the support pipe and flows into the tablet pressing hole of the mold through the discharge pipe and is located above the column body of the top block. While the crankshaft rotates, it can drive the feeding roller to rotate. Then, quantitative feeding is carried out using the groove of the feeding roller, which is convenient to use and simple to control.

[0017] 3. At the same time, the transmission synchronous belt wheel on the left drives the top material synchronous belt wheel to rotate through the second synchronous belt. The top material synchronous belt wheel drives the cam to rotate. Then, as the cam rotates, it gradually contacts the convex column at the lower end of the top block. Thus, the cam drives the top block to move upward. The top block ejects the formed flaky material. At the same time, when the top block moves upward, it compresses the spring sleeved on the outer arc surface of the column body. And the crankshaft also drives the guide wheel to rotate synchronously. The guiding chute of the guide wheel slides relative to the guiding column at the upper end of the sector gear. When the bent part of the guiding chute contacts the guiding column, the guiding chute drives the sector gear to rotate through the guiding column. The sector gear drives the rack to slide along the chute on the upper surface of the mold. The rack drives the push block to move horizontally. Thus, the push block pushes the ejected flaky material in the direction away from the sector gear. Then, the flaky material slides onto the chute plate on the side of the frame and can be collected at the front side. At the same time, the cam gradually separates from the top block, and the top block moves downward and resets under the action of the spring. There are two bends in the guiding chute on the outer arc surface of the guide wheel, and the bending directions are opposite, ensuring that the material can be pushed to both sides alternately. Using the power of the crankshaft rotation, while ejecting the material, it can also realize the pushing of the material to both sides, facilitating the collection of the material. And the structure is simple, facilitating the continuous processing of the material. Description of the Drawings

[0018] Figure 1 Schematic structural diagram of the present invention;

[0019] Figure 2 Schematic cross-sectional structural diagram of the left side of the present invention;

[0020] Figure 3 Schematic enlarged structural diagram at position A of the present invention;

[0021] Figure 4 Schematic cross-sectional structural diagram of the rear side of the present invention.

[0022] In the figure: 1 frame, 2 mold, 3 crankshaft, 4 reduction motor, 5 connecting rod, 6 pressing column, 7 control switch, 8 feeding unit, 81 support pipe, 82 storage hopper, 83 feeding roller, 84 feeding synchronous pulley, 9 driving synchronous pulley, 10 ejector block, 11 synchronous shaft, 12 ejecting synchronous pulley, 13 cam, 14 guide wheel, 15 sector gear, 16 rack, 17 pushing block. Specific implementation manner

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1-3 , the present invention provides the following technical solutions: Embodiment 1

[0025] A double-outlet tablet press with an automatic feeding module, characterized in that it includes a frame 1 and a feeding unit 8;

[0026] Frame 1: A mold 2 is provided at the lower end inside it. The frame 1 provides support for other components. The ejector blocks 10 are symmetrically and slidably connected inside the mold 2. The upper end of the frame 1 is rotatably connected to the crankshaft 3 through a bearing. The outer arc surface of the crankshaft 3 is symmetrically and rotatably connected to the connecting rods 5. The pressing columns 6 are slidably connected inside the guiding holes of the middle cross beam of the frame 1. The lower ends of the connecting rods 5 are respectively rotatably connected to the vertically corresponding pressing columns 6 through pins. Both ends of the crankshaft 3 extend out of the outer surface of the frame 1. A reduction motor 4 is provided on the right side surface of the upper end of the frame 1. The output shaft of the reduction motor 4 is fixedly connected to the right end of the crankshaft 3. The left end of the crankshaft 3 is symmetrically provided with driving synchronous pulleys 9;

[0027] Feeding unit 8: It is arranged at the rear end of the frame 1, and the driving synchronous pulley 9 and the mold 2 are both arranged in cooperation with the feeding unit 8;

[0028] Wherein: It further includes a control switch 7, and the control switch 7 is arranged on the right side of the frame 1. The input end of the reduction motor 4 is electrically connected to the output end of the control switch 7, and the input end of the control switch 7 is electrically connected to an external power supply;

[0029] Specifically, with such a setting, by adjusting the control switch 7, the reduction motor 4 operates. The output shaft of the reduction motor 4 drives the crankshaft 3 to rotate clockwise. The crankshaft 3 drives the two transmission synchronous belt wheels 9 to rotate. At the same time, the axes at the connection points between the two ends of the crankshaft 3 and the connecting rod 5 are misaligned. When the crankshaft 3 rotates, it rotates relative to the upper end of the connecting rod 5. Furthermore, the crankshaft 3 drives the pressing column 6 to slide along the guiding hole of the middle crossbeam of the frame 1 through the connecting rod 5. At the same time, the lower end of the connecting rod 5 slides relative to the upper end of the pressing column 6. Thus, the pressing column 6 moves downward to extrude the material. Then, the powdery material is extruded into flakes under the support of the ejector block 10. Then, as the crankshaft 3 continues to rotate, the pressing column 6 will move upward; Embodiment 2

[0030] The difference between this embodiment and Embodiment 1 is:

[0031] In this embodiment, the feeding unit 8 includes a support pipe 81, a storage hopper 82, and a feeding roller 83. The support pipe 81 is arranged at the rear end of the frame 1. Storage hoppers 82 are provided at the feeding ports on the outer arc surface of the support pipe 81. The discharge pipes arranged at the discharge ports on the outer arc surface of the support pipe 81 all extend into the interior of the mold 2. The feeding roller 83 is rotatably connected to the rear end of the frame 1 through a bearing. The middle of the outer arc surface of the feeding roller 83 is rotatably connected to the inner arc surface of the support pipe 81. Grooves are staggeredly arranged on the outer arc surface of the feeding roller 83. The left end of the feeding roller 83 extends out of the left side surface of the frame 1. The feeding unit 8 further includes a feeding synchronous belt wheel 84. The feeding synchronous belt wheel 84 is arranged at the left end of the feeding roller 83. The feeding roller 83 is drivingly connected to the transmission synchronous belt wheel 9 on the right through a first synchronous belt;

[0032] Specifically, with such a setting, the transmission synchronous belt wheel 9 on the right drives the feeding synchronous belt wheel 84 to rotate through the first synchronous belt. The feeding synchronous belt wheel 84 drives the feeding roller 83 to rotate. When the groove on the outer arc surface of the feeding roller 83 corresponds to the feeding hole on the outer arc surface of the support pipe 81, the material inside the storage hopper 82 will fall into the groove on the outer arc surface of the feeding roller 83. Then, as the feeding roller 83 rotates, the feeding roller 83 will drive the material to move. Then, when the groove on the outer arc surface of the feeding roller 83 corresponds to the discharge port on the outer arc surface of the support pipe 81, the material passes through the support pipe 81 and flows into the tablet pressing hole of the mold 2 through the discharge pipe and is located above the column of the ejector block 10; Embodiment 3

[0033] The difference between this embodiment and Embodiment 1 is:

[0034] In this embodiment, the lower end of the frame 1 is rotatably connected to a synchronous shaft 11 through a bearing. The middle part of the outer arc surface of the synchronous shaft 11 penetrates through the mold 2. The outer arc surface of the synchronous shaft 11 is provided with cams 13 distributed in a staggered manner. The cams 13 are respectively arranged in cooperation with the adjacent ejector blocks 10. The left end of the synchronous shaft 11 extends out of the left side surface of the frame 1 and is provided with an ejector synchronous pulley 12 at the end. The ejector synchronous pulley 12 is drivingly connected to the left driving synchronous pulley 9 through a second synchronous belt. A rack 16 is slidably connected inside the chute on the upper surface of the mold 2. Push blocks 17 are symmetrically arranged on the rear side surface of the rack 16. The front side surface of the middle cross beam of the frame 1 is rotatably connected to a sector gear 15 through a rotating shaft. The sector gear 15 is meshed with the rack 16. A guide wheel 14 is arranged in the middle of the outer arc surface of the crankshaft 3. The guide chute on the outer arc surface of the guide wheel 14 is slidably connected to the guide post at the upper end of the sector gear 15;

[0035] Specifically, with such a setting, the left driving synchronous pulley 9 will drive the ejector synchronous pulley 12 to rotate through the second synchronous belt. The ejector synchronous pulley 12 drives the cam 13 to rotate. Then the cam 13 gradually contacts the convex column at the lower end of the ejector block 10 during rotation. Then the cam 13 will drive the ejector block 10 to move upward. The ejector block 10 will eject the formed sheet-like material. At the same time, when the ejector block 10 moves upward, it will compress the spring movably sleeved on the outer arc surface of the column body. And the crankshaft 3 will also drive the guide wheel 14 to rotate synchronously. The guide chute of the guide wheel 14 and the guide post at the upper end of the sector gear 15 will have relative sliding. When the bent part of the guide chute contacts the guide post, the guide chute will drive the sector gear 15 to rotate through the guide post. The sector gear 15 will drive the rack 16 to slide along the chute on the upper surface of the mold 2. The rack 16 drives the push block 17 to move horizontally. Then the push block 17 will push the ejected sheet-like material in the direction away from the sector gear 15. Then the sheet-like material will slide onto the chute plate on the side surface of the frame 1 and can be collected at the front side. At the same time, the cam 13 gradually separates from the ejector block 10, and the ejector block 10 moves downward and resets under the action of the spring. There are two bends in the guide chute on the outer arc surface of the guide wheel 14, and the bending directions are opposite, ensuring that the material can be pushed to both sides alternately.

[0036] The working principle of a double-outlet tablet press with an automatic feeding module provided by the present invention is as follows: Materials are respectively added to the storage hopper 82, and then the control switch 7 is adjusted. The reduction motor 4 operates, and the output shaft of the reduction motor 4 drives the crankshaft 3 to rotate clockwise. The crankshaft 3 drives two transmission synchronous belt wheels 9 to rotate. The right transmission synchronous belt wheel 9 drives the feeding synchronous belt wheel 84 to rotate through the first synchronous belt. The feeding synchronous belt wheel 84 drives the feeding roller 83 to rotate. When the groove on the outer arc surface of the feeding roller 83 corresponds to the feeding hole on the outer arc surface of the support tube 81, the materials inside the storage hopper 82 will fall into the groove on the outer arc surface of the feeding roller 83. Then, with the rotation of the feeding roller 83, the feeding roller 83 will drive the materials to move. When the groove on the outer arc surface of the feeding roller 83 corresponds to the discharge port on the outer arc surface of the support tube 81, the materials will pass through the support tube 81 and flow into the tablet pressing holes of the mold 2 through the discharge pipe and are located above the column body of the ejector block 10. At the same time, the axes at the connections between the two ends of the crankshaft 3 and the connecting rod 5 are misaligned. When the crankshaft 3 rotates, it rotates relative to the upper end of the connecting rod 5. Furthermore, the crankshaft 3 will drive the pressing column 6 to slide along the guiding hole of the middle cross beam of the frame 1 through the connecting rod 5. At the same time, the lower end of the connecting rod 5 slides relative to the upper end of the pressing column 6. Furthermore, the pressing column 6 moves downward to squeeze the materials. Then, the powdery materials are squeezed into sheets under the support of the ejector block 10. Then, with the continuous rotation of the crankshaft 3, the pressing column 6 will move upward. At the same time, the left transmission synchronous belt wheel 9 will drive the ejecting synchronous belt wheel 12 to rotate through the second synchronous belt. The ejecting synchronous belt wheel 12 drives the cam 13 to rotate. Furthermore, as the cam 13 rotates, it gradually contacts the convex column at the lower end of the ejector block 10. Furthermore, the cam 13 will drive the ejector block 10 to move upward, and the ejector block 10 will eject the formed sheet materials. At the same time, when the ejector block 10 moves upward, it will squeeze the spring sleeved on the outer arc surface of the column body. And the crankshaft 3 will also drive the guide wheel 14 to rotate synchronously. The guiding chute of the guide wheel 14 slides relative to the guiding column at the upper end of the sector gear 15. When the bending part of the guiding chute contacts the guiding column, the guiding chute will drive the sector gear 15 to rotate through the guiding column. The sector gear 15 will drive the rack 16 to slide along the chute on the upper surface of the mold 2. The rack 16 drives the push block 17 to move horizontally. Furthermore, the push block 17 will push the ejected sheet materials in the direction away from the sector gear 15. Furthermore, the sheet materials will slide onto the chute plate on the side of the frame 1 and can be collected on the front side. At the same time, the cam 13 gradually separates from the ejector block 10, and the ejector block 10 moves downward to reset under the action of the spring. There are two bends in the guiding chute on the outer arc surface of the guide wheel 14, and the bending directions are opposite, ensuring that the materials can be pushed to both sides alternately.

[0037] It should be noted that the reduction motor 4 disclosed in the above embodiments can be freely configured according to the actual application scenario. The reduction motor 4 can be selected as the S series worm and worm gear reduction motor. The control switch 7 is provided with a switch button corresponding to the reduction motor 4 for controlling its switching operation.

[0038] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A double-outlet tablet press with an automatic feeding module, characterized in that: It comprises a frame (1) and a feeding unit (8); A frame (1): a mold (2) is provided at the lower end thereof, a material ejecting block (10) is symmetrically slidably connected inside the mold (2), a crankshaft (3) is rotatably connected to the upper end of the frame (1) via a bearing, a connecting rod (5) is symmetrically rotatably connected to the outer arc surface of the crankshaft (3), a pressure column (6) is slidably connected to the inside of the guide hole of the middle crossbeam of the frame (1), the lower end of the connecting rod (5) is rotatably connected to the vertically corresponding pressure column (6) via a pin shaft, both ends of the crankshaft (3) extend out of the outer surface of the frame (1), a reduction motor (4) is provided on the right side surface of the upper end of the frame (1), the output shaft of the reduction motor (4) is fixedly connected to the right end of the crankshaft (3), and a transmission synchronous pulley (9) is symmetrically provided on the left end of the crankshaft (3); A rack (16) is slidably connected inside the slide groove on the upper surface of the mold (2), and a push block (17) is symmetrically provided on the rear side of the rack (16). A fan-shaped gear (15) is rotatably connected to the front side of the middle crossbeam of the frame (1) through a rotating shaft, and the fan-shaped gear (15) is meshingly connected to the rack (16). A guide wheel (14) is provided in the middle of the outer arc surface of the crankshaft (3), and the guide slide groove on the outer arc surface of the guide wheel (14) is slidably connected to the guide column at the upper end of the fan gear (15); A feeding unit (8): arranged at the rear end of the frame (1), the transmission synchronous pulley (9) and the mold (2) are both arranged in cooperation with the feeding unit (8); the feeding unit (8) comprises a support tube (81), a storage hopper (82) and a material-dispensing roller (83); the support tube (81) is arranged at the rear end of the frame (1), the material-dispensing hopper (82) is arranged at the material-inlet of the outer arc surface of the support tube (81), the material-dispensing tube arranged at the material-dispensing outlet of the outer arc surface of the support tube (81) extends to the inside of the mold (2), and the material-dispensing roller (83) is arranged at the material-dispensing hopper (82) of the outer arc surface of the support tube (81). ) is rotatably connected to the rear end of the frame (1) through a bearing, the middle part of the outer arc surface of the material-dispensing roller (83) is rotatably connected to the inner arc surface of the support tube (81), the outer arc surface of the material-dispensing roller (83) is staggered with a groove, and the left end of the material-dispensing roller (83) extends out of the left side of the frame (1); the feeding unit (8) also includes a feeding synchronous pulley (84), the feeding synchronous pulley (84) is arranged at the left end of the material-dispensing roller (83), and the material-dispensing roller (83) is transmission-connected to the transmission synchronous pulley (9) on the right side through a synchronous belt 1; The machine also includes a control switch (7), wherein the control switch (7) is arranged on the right side of the frame (1), the input end of the reduction motor (4) is electrically connected to the output end of the control switch (7), and the input end of the control switch (7) is electrically connected to an external power supply.

2. The double-outlet tablet press with an automatic feeding module according to claim 1, wherein: The lower end of the frame (1) is rotatably connected to a synchronous shaft (11) via a bearing; the middle of the outer arc surface of the synchronous shaft (11) passes through the mold (2); the outer arc surface of the synchronous shaft (11) is provided with cams (13) distributed in a staggered manner; the cams (13) are respectively arranged in cooperation with adjacent ejection blocks (10).

3. The double-outlet tablet press with an automatic feeding module according to claim 2, wherein: The left end of the synchronization shaft (11) extends out of the left side surface of the machine frame (1), and a blanking synchronization pulley (12) is provided at the end. The blanking synchronization pulley (12) is drivingly connected to the left-side driving synchronization pulley (9) through a second synchronous belt.

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