Glue barrel placing bracket for carton production

By designing a glue bucket placing bracket for carton production using clamping device and spring mechanism, the problem of unfixed glue buckets in the prior art is solved, and the work safety and operation convenience are improved.

CN119657434APending Publication Date: 2025-03-21MAANSHAN XIANGHENG PACKAGING CO LTD
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Patent Information

Application Number
CN202510084001.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-20
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The existing glue bucket placing bracket needs to be manually fixed during use, resulting in unstable fixation, which may cause the glue bucket to fall and affect the work safety of construction workers.

Method used

A glue bucket placing bracket for carton production is designed, and the glue bucket is clamped and fixed by clamping and fixing. Through the pressure in the glue bucket and the elastic deformation of the spring, automatic clamping and loosening is achieved.

Benefits of technology

Effectively prevent the glue bucket from being fixed firmly, avoid falling accidents, improve the work safety of construction workers, and facilitate construction workers to remove and replace the glue bucket.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of glue barrel placing supports, in particular to a glue barrel placing support for carton production, which comprises a bottom plate, a gluing assembly is fixedly mounted on the bottom plate, a clamping device is fixedly mounted on the gluing assembly, the gluing assembly comprises a motor, a rotating rod is mounted at the output end of the motor, and a clamping device is fixedly mounted on the rotating rod. Gears are fixedly mounted on the two sides of the rotating rod, telescopic columns are fixedly connected to the gears, telescopic shells are mounted on the outer surfaces of the telescopic columns, a U-shaped rod is fixedly mounted on the telescopic column on one side, a pressing block is fixedly mounted on one side of the U-shaped rod, and a moving sleeve is mounted on the rotating rod; the glue barrel fixing device has the advantages that a glue barrel is clamped and fixed through the clamping device, then the glue barrel is filled with glue, pressure is applied to the glue barrel, the glue barrel is fixed and clamped through the clamping plate, and the phenomenon that the glue barrel is not firmly fixed, the glue barrel falls in the working process, and the working safety of constructors is affected is prevented.
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Description

Technical Field

[0001] The invention relates to the technical field of a glue bucket placement bracket, in particular to a glue bucket placement bracket for carton production. Background Art

[0002] The glue bucket placement bracket for carton production is a device specially designed to support and place glue buckets. In the process of carton production, glue buckets are usually used to store and supply glue, and the placement bracket plays a role in facilitating access, protecting glue buckets and optimizing production space. The glue bucket placement bracket for carton production is widely used in the production line, warehouse and transportation process of carton production enterprises. On the production line, it can be used as a convenient tool for workers to take glue. In the warehouse, it can be used as a special shelf for storing glue buckets. During transportation, it can be used as a packaging device to protect glue buckets from damage. At present, most devices need to store glue in glue buckets during use. Traditional bucket placement bracket equipment needs to be manually fixed by construction workers during use. However, manual fixation may cause loose fixation, resulting in the glue bucket falling during work, affecting the work safety of construction workers. Summary of the invention

[0003] The purpose of the present invention is to provide a glue bucket placement bracket for carton production, which is used to clamp and fix the glue bucket through a clamping device, and then the glue bucket is filled with glue, pressure is applied to the glue bucket, and the clamping plate fixes and clamps the glue bucket to prevent the glue bucket from being loosely fixed, causing the glue bucket to fall during work and affecting the work safety of construction workers.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a glue bucket placement bracket for carton production, comprising a bottom plate, a gluing assembly is fixedly installed on the bottom plate, a clamping device is fixedly installed on the gluing assembly, the gluing assembly comprises a motor, a rotating rod is installed on the output end of the motor, gears are fixedly installed on both sides of the rotating rod, telescopic columns are fixedly connected to the gears, telescopic shells are installed on the outer surfaces of the telescopic columns, a U-shaped rod is fixedly installed on one side of the telescopic column, a pressure block is fixedly installed on one side of the U-shaped rod, a moving sleeve is installed on the rotating rod, a first fixed block is fixedly installed on the lower end of the moving sleeve, and the first fixed One side of the block is connected with an L-shaped pipe, the other side of the first fixed block is fixedly connected with a nozzle, the clamping device includes a glue bucket, a second fixed block is fixedly installed at the lower end of the glue bucket, a pressure rod is fixedly installed at the lower end of the second fixed block, a table is fixedly installed at the lower end of the pressure rod, a second spring is fixedly installed at the lower end of the second fixed block, connecting plates are fixedly installed on both sides of the second fixed block, a first adjusting block is installed on one side of the connecting plate, a second adjusting block is installed on one side of the first adjusting block, a third adjusting block is installed on one side of the second adjusting block, a fourth adjusting block is installed on the first adjusting block, and a clamping plate is installed on the fourth adjusting block.

[0005] Preferably, grooves are provided on both sides of the bottom plate, and a first spring is fixedly installed on one side of the groove.

[0006] Preferably, a fixing plate is fixedly mounted on one side of the first spring, and the paperboard is placed between the fixing plates on both sides.

[0007] Preferably, teeth are provided on the telescopic columns on both sides, the gears are meshed with the teeth, one side of the telescopic columns on both sides is installed through a table, and a table is fixedly installed on the telescopic shells on both sides.

[0008] Preferably, a protection frame is fixedly mounted on the telescopic shells on both sides, and a limiting sleeve is fixedly mounted on both sides of the rotating rod, and the limiting sleeves on both sides are provided with a section of bidirectional thread.

[0009] Preferably, the pressing block is arranged inside the glue bucket, and a value is provided on one side where the U-shaped rod is connected to the pressing block.

[0010] Preferably, one side of the L-shaped pipe extends through the table and is connected to a feed opening, and the feed opening is connected to a glue bucket.

[0011] Preferably, the second spring is arranged outside the pressure rod, and one side of the second spring is fixedly mounted on the table top.

[0012] Preferably, one side of the pressure rod extends through the table top for installation, and the lower ends of the third adjustment blocks on both sides are fixedly installed on the table top.

[0013] Preferably, the connecting plate, the first adjusting block and the third adjusting block are all provided with grooves, the first adjusting block and the second adjusting block are provided with protrusions, the protrusions are connected to the grooves, and the adjusting rods are all arranged at the connection between the connecting plate and the first adjusting block, the first adjusting block and the second adjusting block, the second adjusting block and the third adjusting block, and the fourth adjusting block and the first adjusting block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The glue bucket is filled with glue, and pressure is applied to the glue bucket. The clamping plate fixes and clamps the glue bucket to prevent the glue bucket from being loosely fixed, which causes the glue bucket to fall during the work process and affects the work safety of the construction personnel. When the work is completed, the glue inside the glue bucket is emptied, so that the pressure of the glue bucket is reduced, and the second spring undergoes elastic deformation and resets, thereby driving the clamping plate to release the glue bucket and no longer clamp it, which is convenient for the construction personnel to remove the glue bucket and replace the glue.

[0015] 2. The construction workers turn the motor, and the telescopic column starts to descend. The nozzle applies glue to the box. After the device has applied glue to one layer of cartons, the construction workers pull out the carton layer that has been glued. The telescopic column will descend to a corresponding height. At the same time, the moving sleeve moves back and forth through a bidirectional thread provided on both sides of the rotating rod.

[0016] 3. At the same time, the telescopic column drives the U-shaped rod to pull down, thereby driving the pressure block to apply pressure to the inside of the glue bucket to assist in fixing the glue bucket. A numerical value is set on one side of the U-shaped rod, which makes it convenient for construction workers to observe the storage amount of glue inside the glue bucket during the downward pressure process and replenish the glue bucket in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a right side schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the connection structure between the gluing assembly and the clamping device of the present invention; Figure 4 It is a schematic diagram of the structure of the glue applying assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the clamping device of the present invention; Figure 6 It is a schematic diagram of the structural analysis of the clamping device of the present invention; Figure 7 It is a schematic diagram of the bottom plate structure of the present invention.

[0018] In the figure: 1. bottom plate; 101. first spring; 102. fixed plate; 2. glue application assembly; 201. motor; 202. rotating rod; 203. gear; 204. telescopic column; 205. telescopic shell; 206. U-shaped rod; 207. pressure block; 208. movable sleeve; 209. first fixed block; 210. L-shaped pipe; 211. nozzle; 212. protection frame; 213. limiting sleeve; 3. clamping device; 301. glue bucket; 302. second fixed block; 303. pressure rod; 304. table; 305. second spring; 306. connecting plate; 307. first adjusting block; 308. second adjusting block; 309. third adjusting block; 310. fourth adjusting block; 311. clamping plate; 312. adjusting rod; 313. feeding port. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 3 As shown, the present invention provides a glue bucket placement bracket for carton production, comprising a bottom plate 1, a glue assembly 2 is fixedly mounted on the bottom plate 1 to glue the carton, and a clamping device 3 is fixedly mounted on the glue assembly 2 to clamp and fix the glue bucket 301; See also Figure 3 to Figure 4As shown, the glue-applying assembly 2 includes a motor 201 which is the power source of the whole device and provides power output for the device. When the construction personnel start the motor 201, a rotating rod 202 is installed at the output end of the motor 201, and the motor 201 drives the rotating rod 202 to rotate. Gears 203 are fixedly installed on both sides of the rotating rod 202. The rotating rod 202 drives the gears 203 to rotate. Telescopic columns 204 are fixedly connected to the gears 203, and the gears 203 drive the telescopic columns 204 to telescope. Telescopic shells 205 are installed on the outer surfaces of the telescopic columns 204. The telescopic columns 204 further drive the telescopic columns 204 to telescope inside the telescopic shells 205. At the same time, the telescopic columns 204 drive a U-shaped rod 206 fixedly installed on one side of the telescopic column 204 to move. A pressure block 207 is fixedly installed on one side of the U-shaped rod 206, so that the U-shaped rod 206 drives, and at the same time, a moving sleeve 208 is installed on the rotating rod 202. The rotating rod 202 drives the moving sleeve 208 to move back, and the lower end of the moving sleeve 208 is fixedly installed with a first fixed block 209 for fixed connection. The first fixed block 209 moves with the moving sleeve 208. One side of the first fixed block 209 is connected with an L-shaped pipe 210 to transmit glue. The glue is transmitted through the first fixed block 209, and the nozzle 211 is installed on the other side of the first fixed block 209. Then the first fixed block 209 transmits the glue to the nozzle 211 to apply glue to the box body, and the nozzle 211 moves with the first fixed block 209 through the L-shaped pipe 210; See also Figures 5 and 6 As shown, the clamping device 3 includes a glue bucket 301 for construction workers to store glue. A second fixing block 302 is fixedly installed at the lower end of the glue bucket 301 for fixing the glue bucket 301. When the construction workers fill the glue bucket 301 with glue, the gravity of the glue is transmitted to the second fixing block 302 through the glue bucket 301, and then the pressure rod 303 on one side of the second fixing block 302 moves downward. A table 304 is fixedly installed at the lower end of the pressure rod 303 to fix and support the device. Since a second spring 305 is fixedly installed at the lower end of the second fixing block 302, the second spring 305 is pressed down by the second fixing block 302, and a Elastic deformation, compression, connecting plates 306 are fixedly installed on both sides of the second fixed block 302 for fixed connection and angle adjustment, a first adjusting block 307 is installed on one side of the connecting plate 306 for fixed connection and angle adjustment, a second adjusting block 308 is installed on one side of the first adjusting block 307 for fixed connection and angle adjustment, a third adjusting block 309 is installed on one side of the second adjusting block 308 for fixed connection and angle adjustment, a fourth adjusting block 310 is installed on the first adjusting block 307 for fixed connection and angle adjustment, and a clamping plate 311 is installed on the fourth adjusting block 310 to fix and clamp the glue bucket 301.

[0021] In an optional embodiment, grooves are provided on both sides of the bottom plate 1 to provide a moving place, and a first spring 101 is fixedly installed on one side of the groove for fixed connection and elastic deformation through extrusion.

[0022] In an optional embodiment, a fixing plate 102 is fixedly installed on one side of the first spring 101, and the cardboard is placed between the fixing plates 102 on both sides to fix the cardboard. When the construction workers stack the cartons and place them between the fixing plates 102 on both sides, the cardboard will apply thrust to the fixing plates 102 on both sides. When the fixing plates 102 transfer the thrust to the first spring 101, the first spring 101 undergoes elastic deformation, so that an opposite force is transferred in the reverse direction to the fixing plates 102 on both sides, so that the fixing plates 102 on both sides fix and clamp the stacked cartons to prevent deviation during the gluing process, thereby affecting the gluing.

[0023] In an optional embodiment, teeth are provided on the telescopic columns 204 on both sides, and the gears 203 are meshed with the teeth. One side of the telescopic columns 204 on both sides is installed through the table 304, and the table 304 is fixedly installed on the telescopic shells 205 on both sides. When the construction personnel start the motor 201, the rotating rod 202 rotates, driving the gear 203 to rotate, thereby driving the telescopic column 204 meshed through the teeth to extend inside the telescopic shell 205.

[0024] In an optional embodiment, a protective frame 212 is fixedly installed on both sides of the telescopic shell 205, and a limiting sleeve 213 is fixedly installed on both sides of the rotating rod 202. The limiting sleeves 213 on both sides are provided with a section of bidirectional thread. When the construction personnel start the motor 201, the rotating rod 202 rotates, driving the gear 203 to rotate, and the telescopic column 204 extends inside the telescopic shell 205. When the device rises to a higher layer of the stacked cartons, the construction personnel then rotate the motor, and the telescopic column 204 starts to descend. After the device has finished punching a layer of cartons, the construction personnel pull out the cartons of the layer of cartons that have been glued, and the telescopic column 204 will drop to a corresponding height. At the same time, the moving sleeve 208 reciprocates through the limiting sleeves 213 on both sides of the rotating rod 202 with a section of bidirectional thread.

[0025] In an optional embodiment, the pressing block 207 is arranged inside the glue bucket 301 to apply pressure to the glue bucket 301 and assist in fixing the glue bucket 301. A value is provided on one side where the U-shaped rod 206 is connected to the pressing block 207. During the downward pressing process, it is convenient for construction personnel to observe the storage amount of glue stored in the glue bucket 301 and replenish the glue bucket 301 in time. When the telescopic column 204 is extended inside the telescopic shell 205, the telescopic column 204 drives the U-shaped rod 206 to pull down, thereby driving the pressing block 207 to apply pressure to the inside of the glue bucket 301. The glue bucket 301 is transferred to the second fixed block 302, and then the second fixed block 302 presses the pressure rod 303 to move downward, and the second spring 305 is pressed downward to undergo elastic deformation and compression, and the first adjustment block 307 is driven by the connecting plate 306, and then the second adjustment block 308, the third adjustment block 309, and the fourth adjustment block 310 are driven in sequence to be fixedly connected and adjust the angle, and the clamping plate 311 reinforces the fixed clamping of the glue bucket 301 to prevent the glue bucket from being loosely fixed, etc., which causes the glue bucket to fall during the work process and affects the work safety of the construction personnel.

[0026] In an optional embodiment, one side of the L-shaped pipe 210 extends through the platform 304 and is connected to the discharge port 313, and the discharge port 313 is connected to the glue bucket 301. When the glue inside the glue bucket 301 flows out through the discharge port 313 and is transferred to the L-shaped pipe 210, the L-shaped pipe 210 is then transferred to the nozzle 211 to apply glue to the box.

[0027] In an optional embodiment, the second spring 305 is arranged outside the pressure rod 303 for elastic deformation. One side of the second spring 305 is fixedly mounted on the table 304 for fixation. When the work is completed, the glue inside the glue bucket 301 is emptied, so that the pressure of the glue bucket 301 is relieved, and the second spring 305 is elastically deformed and reset, thereby driving the clamping plate 311 to release the glue bucket 301 and no longer clamp it, making it convenient for construction workers to remove the glue bucket 301 and re-place the glue.

[0028] In an optional embodiment, one side of the pressure rod 303 extends through the table 304 to prevent the pressure rod 303 from being obstructed by the table 304 when moving. The lower ends of the third adjustment blocks 309 on both sides are fixedly installed on the table 304 for fixing and supporting the operation of other connecting devices.

[0029] In an optional embodiment, grooves are provided on the connecting plate 306, the first adjusting block 307, and the third adjusting block 309, and protrusions are provided on the first adjusting block 307 and the second adjusting block 308, and the protrusions are connected to the grooves. The adjusting rods 312 are arranged at the connection between the connecting plate 306 and the first adjusting block 307, the first adjusting block 307 and the second adjusting block 308, the second adjusting block 308 and the third adjusting block 309, and the fourth adjusting block 310 and the first adjusting block 307. When the construction personnel fill the glue bucket 301, the pressure is applied to the transmission. The second fixing block 302 is passed to the second fixing block 302, and then the second fixing block 302 presses the pressure rod 303 to move downward, the second spring 305 is pressed downward, elastic deformation and compression occur, and the adjustment rod 312 is connected to adjust the angle, the connecting plate 306 drives the first adjustment block 307 and then drives the second adjustment block 308, the third adjustment block 309, and the fourth adjustment block 310 in turn, and the clamping plate 311 fixes and clamps the glue bucket 301 to prevent the glue bucket from being loosely fixed, etc., which causes the glue bucket to fall during the work process and affects the work safety of the construction personnel.

[0030] Working principle: When the construction worker fills the glue bucket 301 with glue, the glue bucket 301 applies pressure and transmits it to the second fixed block 302, and then the second fixed block 302 presses the pressure rod 303 downward to move downward, and the second spring 305 is pressed down, elastic deformation and compression occur, and the angle is adjusted by connecting through the adjustment rod 312. The connecting plate 306 drives the first adjustment block 307 and then drives the second adjustment block 308, the third adjustment block 309, and the fourth adjustment block 310 in turn, and the clamping plate 311 presses the glue bucket 301 The glue bucket 301 is fixedly clamped to prevent the glue bucket from being loosely fixed, causing the glue bucket to fall during the work process, affecting the work safety of the construction workers. Then the construction workers start, and when the work is completed, the glue inside the glue bucket 301 is emptied, so that the pressure of the glue bucket 301 is reduced, and the second spring 305 is elastically deformed and reset, so that the clamping plate 311 is driven to release the glue bucket 301 and no longer clamp it, so that the construction workers can take off the glue bucket 301 and re-place the glue. When the motor 201 is turned on, the rotating rod 202 rotates , driving the gear 203 to rotate, the telescopic column 204 extends inside the telescopic shell 205, and when the device rises to a higher layer of stacked cartons, the construction personnel then rotate the motor, and the telescopic column 204 starts to descend through the drive, and the glue inside the glue bucket 301 flows out through the discharge port 313 and is transferred to the L-shaped pipe 210, and then the L-shaped pipe 210 is transferred to the nozzle 211 for gluing the box body. After the device has glued a layer of cartons, the construction personnel pull out the cartons of the layer that has been glued, and the telescopic column 204 will drop to a corresponding height, and at the same time, the movable sleeve 208 is provided with a bidirectional thread for reciprocating movement through the limiting sleeves 213 on both sides of the rotating rod 202. At the same time, the telescopic column 204 drives the U-shaped rod 206 to pull down, thereby driving the pressing block 207 to apply pressure to the inside of the glue bucket 301 to assist in fixing the glue bucket 301. A numerical value is set on one side of the U-shaped rod 206, which is convenient for construction personnel to observe the storage amount of glue stored in the glue bucket 301 during the downward pressing process, and replenish the glue bucket 301 with glue in time.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A support for placing glue buckets for carton production, comprising a bottom plate (1), characterized in that: A gluing assembly (2) is fixedly mounted on the bottom plate (1), and a clamping device (3) is fixedly mounted on the gluing assembly (2); The glue application component (2) comprises a motor (201), a rotating rod (202) is installed at the output end of the motor (201), gears (203) are fixedly installed on both sides of the rotating rod (202), telescopic columns (204) are fixedly connected to the gears (203), telescopic shells (205) are installed on the outer surfaces of the telescopic columns (204), a U-shaped rod (206) is fixedly installed on one side of the telescopic column (204), a pressing block (207) is fixedly installed on one side of the U-shaped rod (206), a moving sleeve (208) is installed on the rotating rod (202), a first fixed block (209) is fixedly installed at the lower end of the moving sleeve (208), one side of the first fixed block (209) is connected to an L-shaped pipe (210), and the other side of the first fixed block (209) is fixedly connected to a nozzle (211); The clamping device (3) comprises a glue bucket (301), a second fixed block (302) is fixedly mounted on the lower end of the glue bucket (301), a pressure rod (303) is fixedly mounted on the lower end of the second fixed block (302), a table (304) is fixedly mounted on the lower end of the pressure rod (303), a second spring (305) is fixedly mounted on the lower end of the second fixed block (302), connecting plates (306) are fixedly mounted on both sides of the second fixed block (302), a first adjustment block (307) is mounted on one side of the connecting plate (306), a second adjustment block (308) is mounted on one side of the first adjustment block (307), a third adjustment block (309) is mounted on one side of the second adjustment block (308), a fourth adjustment block (310) is mounted on the first adjustment block (307), and a clamping plate (311) is mounted on the fourth adjustment block (310).

2. A glue bucket placement bracket for carton production according to claim 1, characterized in that: Grooves are provided on both sides of the bottom plate (1), and a first spring (101) is fixedly mounted on one side of the groove.

3. The glue bucket placement bracket for carton production according to claim 1 is characterized in that: A fixing plate (102) is fixedly mounted on one side of the first spring (101), and the cardboard is placed between the fixing plates (102) on both sides.

4. The glue bucket placement bracket for carton production according to claim 1 is characterized in that: The telescopic columns (204) on both sides are provided with tooth grooves, the gears (203) mesh with the tooth grooves, one side of the telescopic columns (204) on both sides penetrates the table plate (304) for installation, and the table plate (304) is fixedly installed on the telescopic shells (205) on both sides.

5. The glue bucket placement bracket for carton production according to claim 3 is characterized in that: A protection frame (212) is fixedly mounted on the telescopic shells (205) on both sides, and a limiting sleeve (213) is fixedly mounted on both sides of the rotating rod (202). The limiting sleeves (213) on both sides are provided with a section of bidirectional thread.

6. The glue bucket placement bracket for carton production according to claim 1 is characterized in that: The pressing block (207) is arranged inside the glue bucket (301), and a value is provided on one side where the U-shaped rod (206) is connected to the pressing block (207).

7. The glue bucket placement bracket for carton production according to claim 1 is characterized in that: One side of the L-shaped pipe (210) extends through the platform (304) and is connected to the material discharge port (313), and the material discharge port (313) is connected to the glue bucket (301).

8. The glue bucket placement bracket for carton production according to claim 1 is characterized in that: The second spring (305) is arranged outside the pressure rod (303), and one side of the second spring (305) is fixedly mounted on the platform (304).

9. The glue bucket placement bracket for carton production according to claim 6 is characterized in that: One side of the pressure rod (303) extends through the table plate (304) for installation, and the lower ends of the third adjustment blocks (309) on both sides are fixedly installed on the table plate (304).

10. The glue bucket placement bracket for carton production according to claim 1, characterized in that: The connecting plate (306), the first adjusting block (307) and the third adjusting block (309) are all provided with grooves, the first adjusting block (307) and the second adjusting block (308) are provided with protrusions, the protrusions are all connected to the grooves, and the adjusting rods (312) are all arranged at the connection between the connecting plate (306) and the first adjusting block (307), the first adjusting block (307) and the second adjusting block (308), the second adjusting block (308) and the third adjusting block (309), and the fourth adjusting block (310) and the first adjusting block (307).