Edge banding belt conveying and cutting device of plate edge banding machine

Abstract

The utility model provides an edge banding belt conveying and cutting device of a plate edge banding machine, and belongs to the technical field of plate processing equipment. The edge banding belt conveying and cutting device of the plate edge banding machine comprises a supporting frame and an edge banding belt conveying mechanism, a controller is installed on the front side of the supporting frame, a main edge banding belt is installed on the front side of the top of the supporting frame, an auxiliary edge banding belt located on the rear side of the main edge banding belt is installed on the top of the supporting frame, and a belt conveying wheel is installed on the right side of the top of the supporting frame. The two sides of the top of the supporting frame are each provided with a downward pressing roller set located on the front side of the belt conveying wheel, the main air cylinder is fixedly connected to the right side of the bottom of the supporting frame, and the edge sealing belt conveying mechanism is arranged, so that when the supporting frame is used in cooperation with a main edge sealing belt and an auxiliary edge sealing belt, the main edge sealing belt and the auxiliary edge sealing belt can be conveyed; and the situation that the two edge sealing belts are difficult to convey when the supporting seat works is avoided, so that the edge sealing belt conveying continuity and effect of the supporting frame are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plate processing equipment, in particular to an edge banding belt feeding and cutting device of a plate edge banding machine. Background Art

[0002] The edge banding belt feeding and cutting device of the plate edge banding machine is one of the key components of the edge banding machine. It is used to cut the edge banding belt into the required length and accurately feed it into the edge banding working area. When the edge banding belt feeding and cutting device is working, the edge banding belt is transported from the feeding area to the edge banding working area by the belt feeding system, and a conveyor roller or conveyor belt made of wear-resistant material is set with good gripping performance to ensure the stable transportation of the edge banding belt. The belt cutting system is used to cut the edge banding belt into the required length, usually by a knife disc cutting method. The knife disc cutting cuts the edge banding belt into the required length by rotating the knife disc to achieve precise cutting effect. Since the transportation of the edge banding belt has a direct impact on the edge banding efficiency of the edge banding machine, it is necessary to carry out stable transportation of the edge banding belt.

[0003] In the related art, during the use of the edge banding tape feeding and cutting device, a roll of edge banding tape is generally installed between the conveying components of the edge banding tape feeding and cutting device to feed the edge banding tape for use.

[0004] However, during the current use of the edge banding tape feeding and cutting device, due to the way a roll of edge banding tape is installed, when the edge banding tape is conveyed and cut, the user needs to stop the machine in time to replace and install it after the edge banding tape is conveyed and cut. This results in poor continuity in the conveying and cutting of the edge banding tape, affecting the continuity and efficiency of the conveying and cutting of the edge banding tape. Utility Model Content

[0005] In order to make up for the above deficiencies, the utility model provides an edge banding tape feeding and cutting device for a plate edge banding machine that overcomes the above technical problems or at least partially solves the above problems.

[0006] The utility model is achieved in this way:

[0007] The utility model provides an edge banding belt feeding and cutting device for a plate edge banding machine, comprising a support frame, a controller is installed on the front side of the support frame, a main edge banding belt is installed on the front side of the top of the support frame, and a secondary edge banding belt located at the rear side of the main edge banding belt is installed on the top of the support frame;

[0008] An edge-sealing belt feeding mechanism, the edge-sealing belt feeding mechanism comprising:

[0009] The belt conveyor wheel is installed on the right side of the top of the support frame, and both sides of the top of the support frame are equipped with a downward pressure roller group located in front of the belt conveyor wheel;

[0010] Main cylinder; the main cylinder is fixedly connected to the right side of the bottom of the support frame, and the output end of the main cylinder is equipped with a main pressure wheel;

[0011] Auxiliary cylinder; the auxiliary cylinder is fixedly connected to the right side of the bottom of the support frame, and the output end of the auxiliary cylinder is equipped with an auxiliary pressure wheel;

[0012] The belt cutting mechanism is fixed on the rear side of the top of the support frame.

[0013] In a preferred embodiment, the tape cutting mechanism includes a tape cutting cylinder, a translation frame and a tape cutting knife, wherein the tape cutting cylinder is fixedly connected to the rear side of the top of the support frame, the translation frame is fixedly connected to the output end of the tape cutting cylinder, and the tape cutting knife is fixedly connected to the rear side of the translation frame.

[0014] In a preferred solution, a planetary reducer drivingly connected to the belt drive wheel is installed at the bottom of the right side of the support frame, and a servo motor electrically connected to the controller is installed at the bottom of the planetary reducer.

[0015] In a preferred solution, a solenoid valve group electrically connected to the controller is fixedly connected to the rear side of the left side of the support frame, and the solenoid valve group is connected to the main cylinder, the auxiliary cylinder and the belt cutting cylinder respectively through a conduit.

[0016] In a preferred solution, a cylinder regulating valve connected to the electromagnetic valve group is fixedly connected to the rear side of the left side of the support frame, and a cutting cylinder regulating valve connected to the electromagnetic valve group is installed on the rear side of the cylinder regulating valve.

[0017] In a preferred solution, the top of the support frame is fixedly connected to a main photoelectric sensor located on the front side of the tape cutting cylinder, and the top of the support frame is fixedly connected to a secondary photoelectric sensor located on the rear side of the tape cutting cylinder. Both the main photoelectric sensor and the secondary photoelectric sensor are electrically connected to the controller via wires.

[0018] In a preferred solution, a precision indicator located at the front side of the tape cutting cylinder is fixedly connected to the top of the support frame, and a precision screw matched with the precision indicator is installed on the top of the support frame.

[0019] In a preferred solution, a main guide groove is provided on the front side of the top of the support frame, and a secondary guide groove is provided on the top of the support frame behind the main guide groove, and the main guide groove is connected to the rear side of the right side of the secondary guide groove.

[0020] The utility model provides an edge banding tape feeding and cutting device for a plate edge banding machine, and its beneficial effects include:

[0021] 1. By setting up the edge banding conveying mechanism, when the support frame is used with the main edge banding and the auxiliary edge banding, the main edge banding and the auxiliary edge banding can be conveyed, avoiding the situation that it is difficult to convey the two edge bands when the support base is working, thereby improving the continuity and effect of the edge banding conveying of the support frame.

[0022] 2. By setting up the belt cutting mechanism, when the belt conveyor is used in conjunction with the support frame, the main edge band or the secondary edge band transmitted by the belt conveyor can be cut to avoid the difficulty in cutting the main edge band or the secondary edge band during the transmission process, thereby improving the convenience of cutting the main edge band and the secondary edge band.

[0023] 3. By setting up a planetary reducer and a servo motor, when the support frame cooperates with the conveyor wheel, a driving force for rotating the conveyor wheel can be provided to avoid the situation where the conveyor wheel is difficult to rotate to convey the main edge band or the auxiliary edge band when working, thereby improving the rotation and feeding effect of the conveyor wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is an overall stereogram provided by the embodiment of the utility model;

[0026] Figure 2 A left-side stereoscopic structural schematic diagram of a support frame provided in an embodiment of the utility model;

[0027] Figure 3 A rear-view stereoscopic structural diagram of a support frame provided in an embodiment of the utility model;

[0028] In the figure: 1. Support frame; 2. Controller; 3. Main edge band; 4. Auxiliary edge band; 5. Belt conveyor wheel; 6. Pressing roller group; 7. Main cylinder; 8. Main pressure roller; 9. Auxiliary cylinder; 10. Auxiliary pressure roller; 11. Cutting cylinder; 12. Translation frame; 13. Cutting knife; 14. Planetary reducer; 15. Servo motor; 16. Solenoid valve group; 17. Cylinder regulating valve; 18. Cutting cylinder regulating valve; 19. Main photoelectric sensor; 20. Auxiliary photoelectric sensor; 21. Precision indicator; 22. Precision screw; 23. Main guide groove; 24. Auxiliary guide groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Reference Figure 1-Figure 3 The utility model provides a technical solution: an edge banding belt feeding and cutting device of a plate edge banding machine, comprising a support frame 1 and an edge banding belt feeding mechanism, a controller 2 is installed on the front side of the support frame 1, a main edge banding belt 3 is installed on the front side of the top of the support frame 1, and a secondary edge banding belt 4 located on the rear side of the main edge banding belt 3 is installed on the top of the support frame 1. When the support frame 1 is used in conjunction with the main edge banding belt 3 and the secondary edge banding belt 4, the main edge banding belt 3 and the secondary edge banding belt 4 can be conveyed, thereby avoiding the situation where it is difficult to convey the two edge bands when the support seat is working, thereby improving the continuity and effect of the edge banding conveying of the support frame 1.

[0031] Reference Figure 1-Figure 3In a preferred embodiment, the edge banding conveying mechanism includes a conveyor wheel 5, which is installed on the right side of the top of the support frame 1. Both sides of the top of the support frame 1 are equipped with a downward pressure roller group 6 located in front of the conveyor wheel 5. The main cylinder 7 is fixedly connected to the right side of the bottom of the support frame 1. The output end of the main cylinder 7 is equipped with a main pressure wheel 8, and the auxiliary cylinder 9 is fixedly connected to the right side of the bottom of the support frame 1. The output end of the auxiliary cylinder 9 is equipped with an auxiliary pressure wheel 10. The tape cutting mechanism is fixed to the rear side of the top of the support frame 1. The main cylinder 7 and the auxiliary cylinder 9 are intermittently controlled by the controller 2 to drive the main pressure wheel 8 and the auxiliary pressure wheel 10 respectively. When the main cylinder 7 drives the main pressure wheel 8 to move, it applies thrust to the main edge band 3, so that the main edge band 3 contacts the conveyor wheel 5. The conveyor wheel 5 transports the main edge band 3 by rotating to cooperate with the main pressure wheel 8. After the main edge band 3 is transported, the controller When the auxiliary cylinder 9 drives the auxiliary pressure wheel 10 to move, a thrust is applied to the auxiliary edge band 4, so that the auxiliary edge band 4 contacts the conveyor wheel 5. The conveyor wheel 5 again rotates to cooperate with the auxiliary pressure wheel 10 to convey the auxiliary edge band 4, so as to realize the intermittent conveying function of the main edge band 3 and the auxiliary edge band 4. The belt cutting mechanism includes a belt cutting cylinder 11, a translation frame 12 and a belt cutting knife 13. The belt cutting cylinder 11 is fixedly connected to the rear side of the top of the support frame 1, the translation frame 12 is fixedly connected to the output end of the belt cutting cylinder 11, and the belt cutting knife 13 is fixedly connected to the rear side of the translation frame 12. When the conveyor wheel 5 cooperates with the support frame 1, the main edge band 3 or the auxiliary edge band 4 driven by the conveyor wheel 5 can be cut, so as to avoid the situation that the main edge band 3 or the auxiliary edge band 4 is difficult to cut during the conveying process, thereby improving the convenience of cutting the main edge band 3 and the auxiliary edge band 4.

[0032] Reference Figure 2-Figure 3 In a preferred embodiment, a planetary reducer 14 is installed at the bottom of the right side of the support frame 1, and a servo motor 15 electrically connected to the controller 2 is installed at the bottom of the planetary reducer 14. When the support frame 1 cooperates with the belt conveyor 5 to work, a servo motor 15 electrically connected to the controller 2 can be provided to the belt conveyor 5 to provide a driving force for rotating the belt conveyor 5, thereby avoiding the situation where the belt conveyor 5 is difficult to rotate to convey the main edge band 3 or the secondary edge band 4 when working, thereby improving the rotation feeding effect of the belt conveyor 5. The rear side of the left side of the support frame 1 is fixedly connected to a servo motor 15 electrically connected to the controller 2. The solenoid valve group 16 is connected, and the solenoid valve group 16 is connected with the main cylinder 7, the auxiliary cylinder 9 and the belt-cutting cylinder 11 respectively through the conduit. When the main cylinder 7, the auxiliary cylinder 9 and the belt-cutting cylinder 11 are working, the user can be provided with a medium for connecting and transporting with an external air source, and the controller 2 is convenient for controlling the main cylinder 7, the auxiliary cylinder 9 and the belt-cutting cylinder 11 respectively, avoiding the situation that the main cylinder 7, the auxiliary cylinder 9 and the belt-cutting cylinder 11 are difficult to connect and control with the external air source when in use, thereby improving the convenience of connection and control of the main cylinder 7, the auxiliary cylinder 9 and the belt-cutting cylinder 11.

[0033] Reference Figure 2-Figure 3In a preferred embodiment, a cylinder regulating valve 17 connected to the electromagnetic valve group 16 is fixedly connected to the rear side of the left side of the support frame 1, and a cutting cylinder regulating valve 18 connected to the electromagnetic valve group 16 is installed on the rear side of the cylinder regulating valve 17. When the electromagnetic valve group 16 cooperates with the main cylinder 7, the auxiliary cylinder 9 and the cutting cylinder 11 to work, a medium for regulating the air pressure of the main cylinder 7, the auxiliary cylinder 9 and the cutting cylinder 11 can be provided to the user, so as to avoid the situation that it is difficult to regulate the conveying air pressure when the electromagnetic valve group 16 is working, thereby improving the convenience of air pressure conveying regulation of the electromagnetic valve group 16. A main photoelectric sensor 19 located on the front side of the tape cutting cylinder 11 is connected, and a secondary photoelectric sensor 20 located on the rear side of the tape cutting cylinder 11 is fixedly connected to the top of the support frame 1. The main photoelectric sensor 19 and the secondary photoelectric sensor 20 are electrically connected to the controller 2 through wires. When the controller 2 cooperates with the conveyor wheel 5 to work, the main edge band 3 and the secondary edge band 4 transported by the conveyor wheel 5 can be monitored in real time, and the monitoring signal can be transmitted to the controller 2 so that the controller 2 can control the transmission status of the conveyor wheel 5 to avoid the situation where the conveying state is difficult to control when the conveyor wheel 5 is working, thereby improving the convenience of conveying control of the conveyor wheel 5.

[0034] Reference Figure 2-Figure 3 In a preferred embodiment, a precision indicator 21 located on the front side of the tape cutting cylinder 11 is fixedly connected to the top of the support frame 1, and a precision screw 22 cooperating with the precision indicator 21 is installed on the top of the support frame 1. When the support frame 1 cooperates with the tape cutting knife 13 to work, a medium for changing the height of the support frame 1 can be provided to the user, so that the user can make the support frame 1 more compatible with the external processing requirements according to the actual edge sealing requirements of the plate, so as to facilitate better processing of the subsequent processes such as contour scraping, so as to achieve better edge sealing effect, avoid the situation that the support frame 1 is difficult to adjust when in use, thereby improving In order to improve the flexibility and adaptability of the support frame 1, a main guide groove 23 is provided on the front side of the top of the support frame 1, and a secondary guide groove 24 is provided on the top of the support frame 1 behind the main guide groove 23. The main guide groove 23 is communicated with the rear side of the right side of the secondary guide groove 24, so that when the support frame 1 cooperates with the conveyor wheel 5, the main edge band 3 and the secondary edge band 4 can be conveyed and limited and guided, so as to avoid the situation where the conveyor wheel 5 is difficult to guide when conveying the main edge band 3 and the secondary edge band 4, resulting in the position deviation of the main edge band 3 and the secondary edge band 4, thereby improving the conveying and guiding effect of the support frame 1 and the conveyor wheel 5.

[0035] Specifically, the working process or working principle of the edge banding tape feeding and cutting device of the plate edge banding machine is as follows: when in use, first install the support frame 1 to a suitable position with the help of guide rails, bolts or support platforms according to the external plate edge banding processing requirements and site conditions. It should be noted that when the support frame 1 is installed, a force point is provided for the precision screw 22 to facilitate the subsequent adjustment of the height of the support frame 1, and the precision screw 22 is turned according to the plate processing requirements to cooperate with the precision indicator 21 to perform lifting and lowering operations on the overall height of the support frame 1. At this time, the precision indicator 21 measures the working accuracy of the precision screw 22. , observe the digital changes on the precision indicator 21, and then adjust the height of the support frame 1 to the required position to improve the edge sealing effect, so as to ensure the accuracy of the support frame 1 during the adjustment process, and then connect the solenoid valve group 16 to the external air source through the conduit, and provide gas pressure preparation for the subsequent solenoid valve group 16 for the main cylinder 7, the auxiliary cylinder 9 and the belt cutting cylinder 11. At the same time, the cylinder regulating valve 17 and the belt cutting cylinder regulating valve 18 can cooperate with the solenoid valve group 16 to control the air pressure of the gas delivered to the main cylinder 7, the auxiliary cylinder 9 and the belt cutting cylinder 11, and then connect the controller 2 to the external power supply through the wire. 1, and then the main edge band 3 and the secondary edge band 4 can be placed at the same time, and the main edge band 3 and the secondary edge band 4 pass through the two sets of ordinary pulleys on the top of the support frame 1. When the main edge band 3 and the secondary edge band 4 move to the lower pressure roller group 6, the main edge band 3 and the secondary edge band 4 pass through the lower pressure roller group 6 respectively, and the main edge band 3 and the secondary edge band 4 are respectively located in the main guide groove 23 and the secondary guide groove 24. At this time, the lower pressure roller group 6 cooperates with the main guide groove 23 and the secondary guide groove 24 to limit the movement trajectory and position of the main edge band 3 and the secondary edge band 4. Then, the main edge band 3 is passed through The gap between the conveyor wheel 5 and the main pressure wheel 8 is passed, and the auxiliary edge band 4 is passed through the gap between the auxiliary pressure wheel 10 and the conveyor wheel 5, so that the main edge band 3 and the auxiliary edge band 4 are respectively located on both sides of the conveyor wheel 5. When the external edge banding machine wants to use the main edge band 3, the controller 2 controls the corresponding solenoid valve in the solenoid valve group 16 to work to control the main cylinder 7 to work, drive the main pressure wheel 8 to move toward the conveyor wheel 5, and cooperate with the conveyor wheel 5 to press the main edge band 3. At the same time, the controller 2 starts the servo motor 15 to drive the planetary reducer 14 and the conveyor wheel 5 to rotate, and transmit the main edge band 3 to the external glue roller for glue coating and edge sealing.The encoder of the servo motor 15 will calculate the length of the edge band, and when the system requirement is met, the signal will be transmitted to the controller 2. After receiving the signal, the controller 2 controls the corresponding solenoid valve in the solenoid valve group 16 to control the cutting cylinder 11 to drive the translation frame 12 to drive the cutting knife 13 to cut the main edge band 3. During this process, the main photoelectric sensor 19 and the auxiliary photoelectric sensor 20 monitor the main edge band 3 in real time. When the auxiliary photoelectric sensor 20 cannot detect the main edge band 3, it means that the cutting is successful and subsequent work can be carried out. After the main edge band 3 is used up, the main photoelectric sensor 19 cannot detect the main edge band 3, and the signal is transmitted to the controller 2. After receiving the signal, the controller 2 controls the corresponding solenoid valve in the solenoid valve group 16 to work so that the main cylinder 7 is released and the main pressure wheel 8 is reset. The alarm sounds to remind the user to replace the used main edge band 3, and the corresponding solenoid valve in the solenoid valve group 16 is controlled to work to control the auxiliary cylinder 9 to drive the auxiliary pressure wheel 10 to move, and cooperate with the belt conveyor wheel 5 to press the auxiliary edge band 4. At the same time, the servo motor 15 drives the planetary reducer 14 and the belt conveyor wheel 5 to rotate, and the auxiliary edge band 4 is sent to the glue roller for glue coating and edge banding. The encoder of the servo motor 15 will calculate the length of the edge band, and after meeting the system requirements, the signal will be sent to the controller 2. After receiving the signal, the controller 2 controls the corresponding solenoid valve in the solenoid valve group 16 to control the cutting cylinder 11 to drive the translation frame 12 to drive the cutting knife 13 to cut the auxiliary edge band 4. If the auxiliary photoelectric sensor 20 cannot detect the edge band, it means that the cutting is successful and subsequent work can be carried out.

[0036] It should be noted that the controller 2, the main cylinder 7, the auxiliary cylinder 9, the belt cutting cylinder 11, the planetary reducer 14, the servo motor 15, the solenoid valve group 16, the cylinder regulating valve 17, the belt cutting cylinder regulating valve 18, the main photoelectric sensor 19, the auxiliary photoelectric sensor 20 and the precision indicator 21 are all devices or equipment existing in the prior art, or are devices or equipment that can be realized in the prior art. Their power supply, specific composition and principles are clear to those skilled in the art, so they will not be described in detail.

Claims

1. An edge band feeding and cutting device for a plate edge banding machine, comprising a support frame (1), a controller (2) is installed on the front side of the support frame (1), a main edge band (3) is installed on the front side of the top of the support frame (1), and a secondary edge band (4) located at the rear side of the main edge band (3) is installed on the top of the support frame (1), characterized in that ； An edge-sealing belt feeding mechanism, the edge-sealing belt feeding mechanism comprising: The belt conveyor wheel (5) is installed on the right side of the top of the support frame (1), and both sides of the top of the support frame (1) are equipped with a downward pressure roller group (6) located in front of the belt conveyor wheel (5); A main cylinder (7); the main cylinder (7) is fixedly connected to the right side of the bottom of the support frame (1), and a main pressure wheel (8) is installed at the output end of the main cylinder (7); Auxiliary cylinder (9); the auxiliary cylinder (9) is fixedly connected to the right side of the bottom of the support frame (1), and an auxiliary pressure wheel (10) is installed at the output end of the auxiliary cylinder (9); The belt cutting mechanism is fixed on the rear side of the top of the support frame (1).

2. The edge banding tape feeding and cutting device of the plate edge banding machine according to claim 1, characterized in that: The tape cutting mechanism comprises a tape cutting cylinder (11), a translation frame (12) and a tape cutting knife (13); the tape cutting cylinder (11) is fixedly connected to the rear side of the top of the support frame (1); the translation frame (12) is fixedly connected to the output end of the tape cutting cylinder (11); and the tape cutting knife (13) is fixedly connected to the rear side of the translation frame (12).

3. The edge banding tape feeding and cutting device of the plate edge banding machine according to claim 1, characterized in that: A planetary reducer (14) drivingly connected to the belt conveyor (5) is installed at the bottom of the right side of the support frame (1), and a servo motor (15) electrically connected to the controller (2) is installed at the bottom of the planetary reducer (14).

4. The edge banding tape feeding and cutting device of the plate edge banding machine according to claim 1, characterized in that: A solenoid valve group (16) electrically connected to the controller (2) is fixedly connected to the rear side of the left side of the support frame (1), and the solenoid valve group (16) is connected to the main cylinder (7), the auxiliary cylinder (9) and the belt cutting cylinder (11) respectively through a conduit.

5. The edge banding tape feeding and cutting device of the plate edge banding machine according to claim 4, characterized in that: A cylinder regulating valve (17) connected to the electromagnetic valve group (16) is fixedly connected to the rear side of the left side of the support frame (1), and a cutting cylinder regulating valve (18) connected to the electromagnetic valve group (16) is installed on the rear side of the cylinder regulating valve (17).

6. The edge banding tape feeding and cutting device of the plate edge banding machine according to claim 2, characterized in that: The top of the support frame (1) is fixedly connected to a main photoelectric sensor (19) located at the front side of the tape cutting cylinder (11), and the top of the support frame (1) is fixedly connected to a secondary photoelectric sensor (20) located at the rear side of the tape cutting cylinder (11), and both the main photoelectric sensor (19) and the secondary photoelectric sensor (20) are electrically connected to the controller (2) via wires.

7. The edge banding tape feeding and cutting device of a plate edge banding machine according to claim 1, characterized in that: The top of the support frame (1) is fixedly connected to a precision indicator (21) located at the front side of the tape cutting cylinder (11), and the top of the support frame (1) is equipped with a precision screw (22) that cooperates with the precision indicator (21).

8. The edge banding tape feeding and cutting device of a plate edge banding machine according to claim 1, characterized in that: A main guide groove (23) is provided on the front side of the top of the support frame (1), and a secondary guide groove (24) is provided on the top of the support frame (1) and is located behind the main guide groove (23). The main guide groove (23) is connected to the rear side of the right side of the secondary guide groove (24).

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