A new type of glue equipment head bin cooperation mechanism and cooperation method

Abstract

The application provides a new type of head material bin cooperation mechanism and cooperation method of glue equipment, and mainly relates to the field of hollow glass glue equipment. A new type of head material bin cooperation mechanism of glue equipment comprises a main supporting rod and a vice supporting rod, a main slide rail and a main vertical driving mechanism are vertically arranged on the main supporting rod, a vice slide rail and a vice vertical driving mechanism are vertically arranged on the vice supporting rod, a head is slidably arranged on the main slide rail, a material bin is slidably arranged on the vice slide rail, a rotary driving mechanism is arranged on the head seat, a mounting seat is arranged on the rotary shaft of the rotary driving mechanism, a conveying synchronous belt, a bevel shear and a pressing mechanism are sequentially arranged on the mounting seat, and a plurality of limiting supporting rods are arranged around the mounting seat. The application has the beneficial effects that the application can realize the uniform feeding of the glue strip and the glueing operation of the hollow glass, and can reduce the error caused by the change of the feeding rate.

Description

Technical Field

[0001] This invention mainly relates to the field of insulating glass sealing, specifically a new type of sealing equipment with a material hopper and a matching method. Background Technology

[0002] Insulating glass is made by bonding two (or three) panes of glass to an aluminum alloy frame containing a desiccant using a high-strength, airtight composite adhesive. The frames of insulating glass require sealing with sealant to seal the cavity, thus ensuring its heat insulation and sound insulation properties.

[0003] There are two types of sealant for insulated glass, depending on the characteristics of the glass: one is for ordinary insulated glass, which uses hot melt adhesive for sealing the edges; the other, for higher-end insulated glass, uses sealing strips. However, when using sealing strips to seal the edges of insulated glass, the release rate of the strip needs to be adjusted according to the sealing head's action. This requires the sealing strip release motor to constantly change its power. After long-term operation, the accumulation of errors often causes deviations in the strip feed length, requiring frequent manual corrections and affecting production progress. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a novel head hopper matching mechanism for a glue applicator, which enables glue applicator operation of insulating glass under uniform glue strip feeding, thereby reducing errors caused by variations in the feeding rate.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A novel glue-applying equipment's head and hopper assembly mechanism includes a main support rod and a secondary support rod. A main slide rail and a main vertical drive mechanism are vertically mounted on the main support rod. A secondary slide rail and a secondary vertical drive mechanism are vertically mounted on the secondary support rod. The machine head is slidably mounted on the main slide rail. The main vertical drive mechanism drives the machine head to move vertically up and down along the main slide rail. A hopper is slidably mounted on the secondary slide rail. The secondary vertical drive mechanism drives the hopper to move vertically up and down along the secondary slide rail. The machine head includes a sliding seat slidably connected to the main slide rail. A progressive slide rail perpendicular to the main slide rail is mounted on the sliding seat. The progressive drive mechanism includes a machine head seat slidably mounted on the progressive slide rail, a rotation drive mechanism mounted on the machine head seat, a mounting base mounted on the rotating shaft of the rotation drive mechanism, a conveyor timing belt, a bevel shear, and a pressing mechanism sequentially mounted on the mounting base, the pressing mechanism including a pressing cylinder and a pressing wheel, the pressing cylinder pushing the pressing wheel to press the adhesive strip to the edge of the insulating glass through an extension action, several limiting supports are provided around the mounting base to block and restrict the adhesive strip, and a motor-driven material tray is provided in the material hopper, the material tray releasing the adhesive strip at a uniform speed.

[0006] The conveyor belt includes a pair of synchronous belts arranged vertically, with the spacing between the two synchronous belts adapted to the thickness of the rubber strip, and the two synchronous belts rotating in opposite directions.

[0007] The hopper has a glue outlet on the side near the machine head, and a feeding synchronous belt is provided on the outside of the glue outlet. The structure of the feeding synchronous belt is the same as that of the conveyor synchronous belt.

[0008] The mounting base is provided with a positioning pin and a pair of positioning rollers on its front side. The positioning pin includes a pair of vertical pins and a pair of horizontal pins. The positioning rollers are arranged between the positioning pin and the conveyor belt.

[0009] A limiting groove is provided between the oblique shear and the pressing mechanism, and the width of the limiting groove is adapted to the thickness of the rubber strip.

[0010] The limiting support rod has end pieces at both ends and a receiving rod on one side. The receiving rod is located on the outside of the limiting support rod and is rotatably connected to the end pieces.

[0011] A method for assembling the head hopper of a novel glue dispensing equipment, comprising the following main steps: When applying sealant to the top of the insulating glass, the machine head rises above the top of the insulating glass, and the material hopper rises above the machine head. The height difference between the two is L. The length of the sealant strip between the material hopper and the machine head is S, and the lateral width between the material hopper and the machine head is P. As the insulating glass moves laterally, the machine head applies the sealant strip to the top of the insulating glass. The displacement speed of the insulating glass is consistent with the sealant strip feeding speed of the material hopper. Then, sealant is applied to the left side of the insulating glass. The machine head rotates 90 degrees, and at the same time, the material hopper descends by L1 to complete the sealant strip balance compensation. At this time, the sealant strip contacts the limiting support rod on the outside of the machine head. In this state, the length of the sealant strip wrapped around the outer limiting support rod is N1. As the machine head and the material hopper descend synchronously, the sealant strip application on the left side of the insulating glass is completed. The descent speed of the machine head and the material hopper is consistent with the sealant strip feeding speed of the material hopper. In the formula, N1 is obtained by measurement; Then, sealant is applied to the bottom edge of the insulating glass. The machine head continues to rotate 90 degrees, and at the same time, the material hopper descends by L2 to complete the sealant strip balance compensation. At this time, the sealant strip continues to be wrapped around the limiting support rod on the outside of the machine head. In this state, the length of the sealant strip wrapped around the outer limiting support rod is N2. As the insulating glass moves in the opposite direction, the sealant strip application on the bottom edge of the insulating glass is completed. The displacement speed of the insulating glass is consistent with the sealant strip feeding speed of the material hopper. In the formula, N2 is obtained by measurement; Then, sealant is applied to the right side of the insulating glass. The machine head continues to rotate 90 degrees, and at the same time, the material hopper descends by L3 to complete the sealant strip balance compensation. At this time, the sealant strip continues to be wound on the limit support rod on the outside of the machine head. In this state, the length of the sealant strip wound on the outer limit support rod is N3. As the machine head and the material hopper rise synchronously, the sealant strip application on the right side of the insulating glass is completed. The rising speed of the machine head and the material hopper is consistent with the sealant strip feeding speed of the material hopper. In the formula, N3 is obtained by measurement; After the adhesive strip is fully laid, the machine head rotates 270 degrees in the opposite direction to disengage the adhesive strip from the limit support rod. At the same time, the hopper rises by a distance of L1 + L2 + L3 to reset.

[0012] The relationship between the length S of the rubber strip between the hopper and the machine head, the height difference L between the hopper and the machine head, and the lateral width P between the hopper and the machine head is as follows: .

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention separates the machine head and the hopper, and controls them independently. By adjusting the relative displacement of the machine head and the hopper, the entanglement of the glue strip during glue application can be compensated, ensuring that the glue strip is fed at a constant speed. This reduces the accumulation of errors caused by changes in the glue strip feeding rate, thereby improving the accuracy of glue strip feeding and ensuring the glue application effect.

[0014] By compensating for the excess material of the rubber strip by displacing the hopper relative to the die head, it is possible to ensure that the rubber strip is always at a stable feeding rate, avoid the accumulation of excess material error, and reduce the number of times the equipment needs to be adjusted and maintained. Attached Figure Description

[0015] AppendixFigure 1 This is a schematic diagram of the structure of the present invention; Appendix Figure 2 This is a schematic diagram of the head structure of the present invention; Appendix Figure 3 This is a schematic diagram showing the engagement state of the limiting support rod and the rubber strip when the machine head rotates according to the present invention; Appendix Figure 4 This is a schematic diagram of the material tray structure of the silo of the present invention.

[0016] The following are the labels in the attached diagram: 1. Main support rod; 2. Secondary support rod; 3. Machine head; 4. Hopper; 5. Mounting base; 6. Conveyor timing belt; 7. Slanted shear; 8. Pressing mechanism; 9. Limiting support rod; 11. Main slide rail; 12. Main vertical drive mechanism; 21. Secondary slide rail; 22. Secondary vertical drive mechanism; 31. Sliding seat; 32. Progressive slide rail; 33. Progressive drive mechanism; 34. Machine head base; 35. Rotation drive mechanism; 41. Material tray; 42. Feeding timing belt; 51. Positioning pin; 52. Positioning roller; 53. Limiting groove; 81. Pressing cylinder; 82. Pressing wheel; 91. Receiving rod; 92. End piece. Detailed Implementation

[0017] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0018] like Figure 1-4 As shown, the head and hopper coordination mechanism of a novel glue-applying device according to the present invention includes a main support rod 1 and a secondary support rod 2, which are symmetrically arranged. A main slide rail 11 and a main vertical drive mechanism 12 are vertically arranged on the main support rod 1, and a secondary slide rail 21 and a secondary vertical drive mechanism 22 are vertically arranged on the secondary support rod 2. In this embodiment, both the main vertical drive mechanism 12 and the secondary vertical drive mechanism 22 adopt a chain drive or synchronous belt drive mechanism driven by a servo motor. The head 3 is slidably mounted on the main slide rail 11, and the main vertical drive mechanism 12 is used to drive the head 3 to move vertically up and down along the main slide rail 11. The hopper 4 is slidably mounted on the secondary slide rail 21, and the secondary vertical drive mechanism 22 is used to drive the hopper 4 to move vertically up and down along the secondary slide rail 21. Through the drive of the servo motor, both the head 3 and the hopper 4 can be precisely displaced along their respective slide rails.

[0019] The machine head 3 includes a sliding seat 31 slidably connected to the main slide rail 11. A progressive slide rail 32 perpendicular to the main slide rail 11 and a progressive drive mechanism 33 are mounted on the sliding seat 31. The progressive drive mechanism 33 is a lead screw transmission mechanism driven by a servo motor. A machine head base 34 is slidably mounted on the progressive slide rail 32. The progressive drive mechanism 33 is used to push the machine head base 34 toward the insulating glass, enabling the machine head 3 to engage with the glass during sealant application.

[0020] A rotary drive mechanism 35 is installed on the headstock 34, and a mounting base 5 is installed on the shaft of the rotary drive mechanism 35. The rotary drive mechanism 35 is a servo motor driven reduction mechanism, which can drive the mounting base 5 to rotate precisely. A conveyor belt 6, a bevel shear 7, and a pressing mechanism 8 are sequentially installed on the mounting base 5. After the adhesive strip is released from the hopper 4, it enters the headstock 3. The adhesive strip passes through the conveyor belt 6, the bevel shear 7, and the pressing mechanism 8 in sequence. The conveyor belt 6 is used to convey the adhesive strip, ensuring it is stably fed to the insulating glass unit. The bevel shear 7 is used to cut the adhesive strip, and the pressing mechanism 8 is used to press the adhesive strip onto the side of the insulating glass unit. Specifically, the pressing mechanism 8 includes a pressing cylinder 81 and a pressing wheel 82. The pressing cylinder 81 extends to push the pressing wheel 82 to press the adhesive strip firmly against the edge of the insulating glass unit.

[0021] Specifically, to ensure precise positioning of the adhesive strip during conveying on the machine head, a positioning pin 51 and a pair of positioning rollers 52 are provided on the front side of the mounting base 5. The positioning pin 51 includes a pair of vertical pins and a pair of horizontal pins, and the positioning rollers 52 are positioned between the positioning pin 51 and the conveyor timing belt 6. Through the dual cooperation of the positioning pin 51 and the positioning rollers 52, stable positioning of the adhesive strip conveying can be achieved, making the adhesive strip application operation more precise and stable. Specifically, the conveyor timing belt 6 includes a pair of timing belts arranged vertically, with the distance between the two timing belts slightly less than the thickness of the adhesive strip. The two timing belts rotate in opposite directions, allowing the adhesive strip to be conveyed to the insulating glass sealing position without slippage, ensuring the accuracy of the adhesive strip conveying.

[0022] Furthermore, a limiting groove 53 is provided between the beveled shear 7 and the pressing mechanism 8. The width of the limiting groove 53 is the same as the thickness of the adhesive strip. The limiting groove 53 can further limit the application of the adhesive strip, thereby ensuring that the adhesive strip is more stable during application. Specifically, the beveled shear 7 is a pneumatic shear. Through the cutting action of the beveled shear 7, the adhesive strip can be cut. The beveled structure can ensure good connection between the two ends of the adhesive strip, completing the application of the adhesive strip at the edge of the insulating glass.

[0023] Several limiting rods 9 are arranged around the mounting base 5. These limiting rods 9 are used to block and restrict the adhesive strip. When applying adhesive to the edges of the insulating glass, the limiting rods 9 can restrict the adhesive strip, preventing it from directly interfering with the machine head 3 and affecting the application. End pieces 92 are provided at both ends of the limiting rods 9, and a receiving rod 91 is provided on one side of the limiting rod 9. The receiving rod 91 is located outside the limiting rod 9 and is rotatably connected to the end pieces 92. In this embodiment, the limiting rod 9 serves as a supporting component, and the receiving rod 91 serves as the active component in contact with the adhesive strip. As the adhesive strip is conveyed, the receiving rod 91 rotates accordingly, thereby reducing friction between the rod and the adhesive strip and making the conveying of the adhesive strip smoother.

[0024] The hopper 4 contains a motor-driven material tray 41. The hopper 4 has a glue outlet near the machine head 3, where a speed sensor is installed. The speed sensor detects and controls the glue strip to be output at a uniform speed. A feeding synchronous belt 42 is installed outside the glue outlet. The structure of the feeding synchronous belt 42 is identical to that of the conveying synchronous belt 6. The power of the feeding synchronous belt 42 ensures stable glue strip output. The feeding synchronous belt 42 works in conjunction with the conveying synchronous belt 6 to transport the glue strip during the glue application process. The rotation speeds of the feeding synchronous belt 42 and the conveying synchronous belt 6 are the same.

[0025] A method for cooperating with the head hopper mechanism of a novel glue dispensing equipment, specifically including the following steps: When applying sealant to the top of the insulating glass unit, the machine head 3 rises above the top of the insulating glass unit, and the material hopper 4 rises above the machine head 3, with a height difference of L between them. The length of the sealant strip between the material hopper 4 and the machine head 3 is S, and the lateral width between the material hopper 4 and the machine head 3 is P. As the insulating glass unit moves laterally, the machine head 3 applies the sealant strip to the top of the insulating glass unit. The displacement speed of the insulating glass unit is consistent with the sealant strip feeding speed of the material hopper 4, thereby ensuring that the sealant strip is applied to the top side of the insulating glass unit.

[0026] Then, sealant is applied to the left side of the insulated glass, such as... Figure 3 As shown, the machine head 3 rotates 90 degrees, and simultaneously the hopper 4 descends by L1 to compensate for the excess adhesive strip. At this point, the adhesive strip contacts the limiting support rod 9 on the outer side of the machine head 3. In this state, the length of the adhesive strip wound on the outer limiting support rod 9 is N1, which is obtained from the measurement in the testing phase. Subsequently, the machine head 3 and the hopper 4 are controlled to descend synchronously to complete the application of the adhesive strip on the left side of the insulating glass. The descent speed of the machine head 3 and the hopper 4 is consistent with the adhesive strip feeding speed of the hopper 4. The descent distance L1 of the hopper 4 is used to compensate for the adhesive strip winding length when the machine head 3 rotates. This allows us to calculate the descent distance of L1. The time it takes for the hopper 4 to descend by L1 is the same as the time required for the machine head to rotate 90 degrees.

[0027] Then, sealant is applied to the bottom edge of the insulating glass. The machine head 3 continues to rotate 90 degrees, while the material bin 4 descends by L2 to complete the sealant strip balance compensation. At this time, the sealant strip continues to wrap around the limiting support rod 9 on the outside of the machine head 3. In this state, the length of the sealant strip wrapped around the outer limiting support rod 9 is N2. N2 is also obtained by measurement in the testing phase. As the insulating glass moves in the reverse direction, the sealant strip application on the bottom edge of the insulating glass is completed. The displacement speed of the insulating glass is consistent with the sealant strip feeding speed of the material bin (4). Among them, the distance L2 of the descent of the material bin 4 is used to compensate for the length of the sealant strip wrapping when the machine head 3 rotates for the second time. This allows us to calculate the descent distance of L2. The time it takes for hopper 4 to descend by L2 is the same as the time required for the machine head to rotate the second 90 degrees.

[0028] Then, sealant is applied to the right side of the insulating glass. The machine head 3 continues to rotate 90 degrees, while the material hopper 4 descends by L3 to compensate for any remaining sealant. At this point, the sealant continues to wrap around the limiting support rod 9 on the outside of the machine head 3. The length of the sealant wrapped around the outer limiting support rod 9 in this state is N3, which is also obtained through measurement during the testing phase. As the machine head 3 and material hopper 4 rise synchronously, the sealant application on the right side of the insulating glass is completed. The rising speed of the machine head 3 and material hopper 4 is consistent with the sealant feeding speed of the material hopper 4. The descent distance L3 of the material hopper 4 is used to compensate for the length of the sealant wrapped during the third rotation of the machine head 3. This allows us to calculate the descent distance of L3. The time it takes for the hopper 4 to descend by L3 is the same as the time required for the machine head to rotate the third 90 degrees.

[0029] After the adhesive strip is fully applied, the machine head 3 rotates 270 degrees in the reverse direction to disengage the adhesive strip from the limiting support rod 9. At the same time, the material hopper 4 rises by a distance of L1 + L2 + L3 to reset. The reset time of the material hopper 4 is consistent with the time it takes for the machine head 3 to rotate 270 degrees in the reverse direction.

[0030] This invention uses the length S of the adhesive strip to replace the hypotenuse of the triangle formed by the hopper 4, the machine head 3, and the horizontal plane, thus calculating the distances L1, L2, and L3. In practice, to ensure the adhesive strip has a certain degree of elasticity and cushioning, S should be greater than the hypotenuse of the triangle. Specifically, the relationship between the length S of the adhesive strip between the hopper 4 and the machine head 3, the height difference L between the hopper 4 and the machine head 3, and the lateral width P between the hopper 4 and the machine head 3 is as follows: .

Claims

1. A novel headstock hopper assembly mechanism for a glue dispensing device, comprising a main support rod (1) and a secondary support rod (2), characterized in that: The main support rod (1) is vertically equipped with a main slide rail (11) and a main vertical drive mechanism (12). The auxiliary support rod (2) is vertically equipped with a secondary slide rail (21) and a secondary vertical drive mechanism (22). The machine head (3) is slidably mounted on the main slide rail (11). The main vertical drive mechanism (12) is used to drive the machine head (3) to move vertically up and down along the main slide rail (11). The hopper (4) is slidably mounted on the secondary slide rail (21). The secondary vertical drive mechanism (22) is used to drive the hopper (4) to move vertically up and down along the secondary slide rail (21). The machine head (3) includes a sliding seat (31) slidably connected to the main slide rail (11). The sliding seat (31) is equipped with a progressive slide rail (32) perpendicular to the main slide rail (11) and a progressive drive mechanism (33). A machine head seat (34) is slidably mounted on a progressive slide rail (32). A rotation drive mechanism (35) is mounted on the machine head seat (34). A mounting seat (5) is mounted on the rotating shaft of the rotation drive mechanism (35). A conveyor timing belt (6), a slanted shear (7), and a pressing mechanism (8) are sequentially mounted on the mounting seat (5). The pressing mechanism (8) includes a pressing cylinder (81) and a pressing wheel (82). The pressing cylinder (81) pushes the pressing wheel (82) to press the adhesive strip to the edge of the insulating glass through an extension action. Several limiting rods (9) are set around the mounting seat (5). The limiting rods (9) are used to block and restrict the adhesive strip. A motor-driven material tray (41) is set in the material bin (4). The material tray (41) releases the adhesive strip at a uniform speed.

2. The head hopper matching mechanism of a novel glue-applying equipment according to claim 1, characterized in that: The conveyor belt (6) includes a pair of synchronous belts arranged vertically, with the spacing between the two synchronous belts adapted to the thickness of the rubber strip, and the two synchronous belts rotating in opposite directions.

3. The head hopper matching mechanism of a novel glue-applying equipment according to claim 2, characterized in that: The hopper (4) has a glue outlet on the side near the machine head (3), and a feeding synchronous belt (42) is provided on the outside of the glue outlet. The structure of the feeding synchronous belt (42) is the same as that of the conveying synchronous belt (6).

4. The head hopper matching mechanism of a novel glue-applying equipment according to claim 1, characterized in that: The mounting base (5) is provided with a positioning pin (51) and a pair of positioning rollers (52) on the front side. The positioning pin (51) includes a pair of vertical pins and a pair of horizontal pins. The positioning rollers (52) are arranged between the positioning pin (51) and the conveyor belt (6).

5. The head hopper matching mechanism of a novel glue-applying equipment according to claim 1, characterized in that: A limiting groove (53) is provided between the oblique shear (7) and the pressing mechanism (8), and the width of the limiting groove (53) is adapted to the thickness of the rubber strip.

6. The head hopper matching mechanism of a novel glue-applying equipment according to claim 1, characterized in that: The limiting support rod (9) has end pieces (92) at both ends, and a receiving rod (91) is provided on one side of the limiting support rod (9). The receiving rod (91) is located on the outside of the limiting support rod (9), and the receiving rod (91) is rotatably connected to the end piece (92).

7. The method for fitting the head hopper fitting mechanism of a novel glue dispensing equipment according to any one of claims 1-6, characterized in that: When applying sealant to the top of the insulating glass, the machine head (3) rises above the top of the insulating glass, and the hopper (4) rises above the machine head (3). The height difference between the two is L. The length of the sealant strip between the hopper (4) and the machine head (3) is S. The lateral width between the hopper (4) and the machine head (3) is P. As the insulating glass moves laterally, the machine head (3) applies the sealant strip to the top of the insulating glass. The displacement speed of the insulating glass is consistent with the sealant strip feeding speed of the hopper (4). Then, the left side of the insulating glass is coated with glue. The machine head (3) rotates 90 degrees, and at the same time, the material hopper (4) descends by L1 to complete the glue strip balance compensation. At this time, the glue strip is in contact with the limiting support rod (9) on the outside of the machine head (3). In this state, the length of the glue strip wrapped on the outer limiting support rod (9) is N1. As the machine head (3) and the material hopper (4) descend synchronously, the glue strip on the left side of the insulating glass is laid. The descent speed of the machine head (3) and the material hopper (4) is consistent with the glue strip feeding speed of the material hopper (4). In the formula, N1 is obtained by measurement; Then, the bottom edge of the insulating glass is coated with glue. The machine head (3) continues to rotate 90 degrees. At the same time, the material bin (4) descends by L2 to complete the glue strip balance compensation. At this time, the glue strip continues to be wrapped on the limiting support rod (9) on the outside of the machine head (3). In this state, the length of the glue strip wrapped on the outer limiting support rod (9) is N2. As the insulating glass moves in the opposite direction, the glue strip is laid on the bottom edge of the insulating glass. The displacement speed of the insulating glass is consistent with the glue strip feeding speed of the material bin (4). In the formula, N2 is obtained by measurement; Then, the right side of the insulating glass is coated with glue. The machine head (3) continues to rotate 90 degrees. At the same time, the material hopper (4) descends L3 to complete the glue strip balance compensation. At this time, the glue strip continues to be wrapped on the limiting support rod (9) on the outside of the machine head (3). In this state, the length of the glue strip wrapped on the outer limiting support rod (9) is N3. As the machine head (3) and the material hopper (4) rise synchronously, the glue strip on the right side of the insulating glass is laid. The rising speed of the machine head (3) and the material hopper (4) is consistent with the glue strip feeding speed of the material hopper (4). In the formula, N3 is obtained by measurement; After the adhesive strip is laid, the machine head (3) rotates 270 degrees in the opposite direction to disengage the adhesive strip from the limiting support rod (9). At the same time, the hopper (4) rises by a distance of L1+L2+L3 to complete the reset.

8. The method for cooperating with the head hopper of a novel glue-applying equipment according to claim 7, characterized in that: The relationship between the length S of the rubber strip between the hopper (4) and the machine head (3), the height difference L between the hopper (4) and the machine head (3), and the lateral width P between the hopper (4) and the machine head (3) is as follows: .

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