Positioning structure based on box body blister

Abstract

The invention relates to the technical field of blister equipment, and discloses a positioning structure based on box blister, which comprises a machine body and a lifting heating assembly, and is used for heating a plastic blank and realizing up-and-down transfer; the plastic uptake mold is used for manufacturing a plastic uptake mold of the box body; the positioning assembly is used for positioning the plastic blank before plastic uptake; the plastic suction mold is arranged in the machine body, and the lifting heating assembly is located above the plastic suction mold. According to the positioning structure based on box body plastic uptake, by means of the arranged positioning assembly, horizontal placement positioning of plastic blanks can be achieved, alignment positioning of the back position can also be achieved, so that placement positioning of the blanks is achieved, and by means of positioning of the blanks through the positioning device, position fixing of the blanks after heating can be achieved; stable operation of the plastic uptake process after heating is guaranteed, so that the yield of box body forming is improved, the probability of defective products is reduced, multiple manual operation traction is not needed in the whole process, and operation is easy and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of blister equipment, in particular to a positioning structure based on box blister. Background Art

[0002] Blister forming is a plastic processing technology. The main principle is to heat and soften the flat plastic hard sheet, then use vacuum adsorption to the mold surface, and then cool it to form. It is widely used in plastic packaging, lighting, advertising, decoration and other industries. Blister box is the product of this process. The existing fully automatic blister forming machine is a machine that absorbs the heated and plasticized thermoplastic plastic coils such as PVE, PE, PP, PET, HIPS into high-end packaging blister boxes of various shapes.

[0003] In many existing blister processes, the plastic blank is heated and softened, and then placed on a mold, and then vacuum suction is performed. The softened plastic blank will be subjected to vacuum suction and firmly adsorbed on the mold to achieve the molding operation. However, in the process of positioning the blank and the mold, many still require manual positioning. If the position of the blank is incorrect, it is easy to cause the softened blank to be molded incompletely during the blister process. The traditional positioning accuracy is poor, and relying on manual rough calibration will increase the unqualified rate of blister products. Therefore, a positioning structure based on box blister is proposed to solve the above problems. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a positioning structure based on box body blister forming, which solves the problem in the existing technology that the positioning of the blank in the blister forming process is too rough and has poor accuracy, resulting in a high proportion of defective products in subsequent blister forming.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a positioning structure based on box body blister forming, comprising a machine body, a lifting and heating component for heating the plastic blank and realizing the up and down position movement; a blister forming mold for making a mold for the box body blister forming; a positioning component for positioning the plastic blank before blister forming; the blister forming mold is arranged inside the machine body, and the lifting and heating component is located above the blister forming mold; the positioning component includes a placement positioning device and a back positioning device; the placement positioning device realizes position positioning of the plastic blank during the placement process; and the back positioning device calibrates and positions the back position of the plastic blank.

[0008] Preferably, the lifting and heating assembly includes a telescopic cylinder, which is installed inside the machine body, and the output shaft of the telescopic cylinder is connected to an upper pressure plate, a heating tube is installed at the bottom of the upper pressure plate, and a baffle is installed at the bottom of the upper pressure plate, and the heating tube is located above the baffle.

[0009] Preferably, the placement and positioning device includes a plate body, the plate body is connected to the retaining net through a connecting piece, a retractable plate is slidably connected inside the plate body, and a plurality of insert vertebrae are installed on the retractable plate.

[0010] Preferably, the retraction plate is connected to a slide, the slide is rotatably connected to a roller, the bottom of the retraction plate is connected to a compression spring, the bottom of the compression spring is connected to the bottom of the machine body, a retraction tooth plate is fixedly connected to the retraction plate, one side of the retraction tooth plate is engaged with an intermediate gear, one side of the intermediate gear is engaged with a resistance tooth plate, the resistance tooth plate is slidably connected to the plate body through a T-slot, and the intermediate gear is rotatably connected to the plate body.

[0011] Preferably, the front and rear sides of the plate body are connected with a frame plate, the frame plate is connected with a sliding rod, the sliding rod is slidably connected to the inside of the plate body, the surface of the sliding rod is located inside the plate body and is sleeved with a contraction spring, an inclined groove is provided on the frame plate, the inside of the inclined groove is slidably connected with a sliding pin, and one end of the sliding pin is fixed to the side of the contraction tooth plate.

[0012] Preferably, the back positioning device includes a back plate, which is slidably connected to the inside of the body, and one side of the back plate is abutted against a swing fork, and the middle part of the swing fork is rotatably connected to the back of the body. A movable groove is provided on the swing fork, and a push rod is slidably connected in the movable groove, and a push pin is connected to the top rod. The surface of the top rod is slidably connected to a bracket, and the bracket is fixed to the side of the body. The bottom of the top rod is connected to a reset spring through a connecting piece, and the other end of the reset spring is fixed to the bracket.

[0013] Preferably, there are two back plates, and the two back plates are slidably connected via a T-slot.

[0014] Preferably, it also includes a right pressure plate and a left pull plate, which are respectively fixed on the bottom of the two plate bodies, and the right pressure plate and the left pull plate are both provided with bevels, and the right pressure plate and the left pull plate are slidably connected with a movable plate, and the movable plate slides horizontally inside the body, and a suction hole is provided on the movable plate, and a vacuum pump is provided inside the body, and the output end of the vacuum pump is connected to the movable plate through a pipe.

[0015] Preferably, the bottom of the right pressure plate is connected to a connecting frame, a plurality of telescopic columns are installed on the connecting frame, the telescopic columns are rotatably connected to pulleys, the telescopic columns are slidably connected to the interior of the body and abut against the bottom of the blister mold, and a limiting plate is installed at the front of the body.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the present invention provides a positioning structure based on box blister, which has the following beneficial effects:

[0018] 1. The positioning structure based on the box body blister can realize the flat positioning of the plastic blank through the provided positioning component, and can also realize the alignment and positioning of the back position, so as to realize the placement and positioning of the blank. Because after heating, the position of the plastic blank may shift after softening, and the positioning of the blank by the positioning device can realize the position fixation of the blank after heating, ensure the stable operation of the blister process after heating, thereby improving the finished product rate of the box body molding and reducing the probability of defective products. In addition, the whole process does not require multiple manual operations and traction, and the operation is simple and convenient.

[0019] 2. The positioning structure based on the box body blister can realize the blistering work only after the whole equipment reaches the designated position through the automatic airflow blocking structure, so the consistency of the blister products can be basically guaranteed each time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a positioning structure based on box blistering proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a lifting and heating component based on a positioning structure of a box blister proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of a placement and positioning device based on a positioning structure of a box blister proposed by the present invention;

[0023] Figure 4 This is a schematic diagram of a frame-plate connection structure of a positioning structure based on box blistering proposed by the present invention;

[0024] Figure 5 This is a schematic structural diagram of a back positioning device based on a positioning structure of a box body blister proposed by the present invention;

[0025] Figure 6 This is a schematic diagram of the right pressure plate connection structure of a positioning structure based on box blister proposed by the present invention;

[0026] Figure 7This is a schematic diagram of the left pull plate connection structure of a positioning structure based on box body blistering proposed by the present invention.

[0027] In the figure: 1. body; 2. lifting heating component; 21. upper pressure plate; 22. heating tube; 23. baffle; 3. blister mold; 4. positioning component; 401. plate; 402. conflicting tooth plate; 403. intermediate gear; 404. retraction plate; 405. retraction spring; 406. slide bar; 407. shelf; 408. retraction tooth plate; 409. insert vertebra; 410. compression spring; 411. sliding pin; 412. inclined groove; 413. slide table; 414. movable groove; 415. back plate; 416. swing fork; 417. push rod; 418. bracket; 419. push pin; 420. reset spring; 421. right pressure plate; 422. limit plate; 423. connecting frame; 424. telescopic column; 425. movable plate; 426. suction hole; 427. left pull plate. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 A positioning structure based on box blister molding includes a body 1; a lifting and heating component 2, used to heat the plastic blank and realize the up and down position movement; a blister mold 3, used to make the mold for box blister molding; a positioning component 4, used to position the plastic blank before blister molding; the blister mold 3 is arranged inside the body 1, and the lifting and heating component 2 is located above the blister mold 3.

[0030] In this embodiment, the lifting and heating assembly 2 includes a telescopic cylinder, which is installed inside the body 1. The output shaft of the telescopic cylinder is connected to the upper pressing plate 21. The bottom of the upper pressing plate 21 is installed with a heating tube 22. The heating tube 22 heats and softens the blank. After that, the softened blank is affected by the inserts 409 on both sides and will not slide, so its position is relatively fixed. The bottom of the upper pressing plate 21 is installed with a blocking net 23, and the heating tube 22 is located above the blocking net 23. The blocking net 23 can achieve a balanced blocking of heat, so that it can act on the blank evenly through the holes, avoiding the situation where the softening degree varies due to inconsistent local temperatures.

[0031] Furthermore, the positioning assembly 4 includes a placement positioning device and a back positioning device;

[0032] The placement and positioning device includes a plate 401, which is connected to the retaining net 23 via a connector. A retractable plate 404 is slidably connected to the interior of the plate 401, and a plurality of inserts 409 are mounted on the retractable plate 404. The entire blank is supported by the inserts 409 on both sides, so the initial support is provided by the multiple inserts 409. Compared with the platform-type support in the prior art, this method is more stable. Because the softened blank is prone to slipping, the inserts 409 can effectively prevent this situation. The inserts 409 provide the sharp end support for the softened blank, providing more stability.

[0033] Furthermore, the shrinking plate 404 is connected to a slide 413, and a roller is rotatably connected to the slide 413. The roller on the slide 413 is provided to facilitate the operator to slide and insert the blank. The bottom of the shrinking plate 404 is connected to a compression spring 410, and the bottom of the compression spring 410 is connected to the bottom of the body 1. The shrinking plate 404 is fixedly connected to a shrinking tooth plate 408, and one side of the shrinking tooth plate 408 is meshed with an intermediate gear 403, and one side of the intermediate gear 403 is meshed with a conflicting tooth plate 402. The conflicting tooth plate 402 is slidably connected to the plate body 401 through a T-slot, and the intermediate gear 403 is rotatably connected to the plate body 401. The entire softened blank will also move downward synchronously. After reaching a certain position, the abutting tooth plate 402 will first contact the plane at the bottom of the body 1 to form an abutment, and then continue to move downward, which will drive the abutting tooth plate 402 to move upward, and then through the meshing relationship of the gears, drive the contraction tooth plate 408 to move downward, and then the contraction tooth plate 408 will drive the contraction plate 404 to move downward, contracting the contraction plate 404 and the inserted vertebra 409 above into the interior of the plate body 401. Because the softened plastic is positioned by multiple inserted vertebrae 409 at this time, if blister molding is performed at this time, it is easy to cause the blister around the box body to be strained. Therefore, a retractable structure is designed as a whole. When blister molding is about to be performed, the contraction structure can be used to retract the contraction plate 404 to the inside to avoid strain.

[0034] In addition, the front and rear sides of the plate body 401 are connected to a frame plate 407, and a slide bar 406 is connected to the frame plate 407. The slide bar 406 is slidably connected to the inside of the plate body 401. The surface of the slide bar 406 is located inside the plate body 401 and is sleeved with a contraction spring 405. The frame plate 407 is provided with an inclined groove 412. A sliding pin 411 is slidably connected to the inside of the inclined groove 412. One end of the sliding pin 411 is fixed to the side of the contraction tooth plate 408. In order to prevent the molded product from having a step shape, after the contraction tooth plate 408 moves downward, it also drives the entire sliding pin 411 downward. Because the sliding pin 411 slides in the inclined groove 412, it drives the frame plate 407 forward according to the sliding of the inclined surface. The slide bar 406 is used to guide the front and rear sliding limit. At this time, the frame plate 407 will move forward and backward and will separate from the softened blank. After separation, the softened blank will directly adhere to the upper edge position of the blister mold 3.

[0035] In addition, the back positioning device calibrates the back position of the plastic blank.

[0036] The back positioning device includes a back plate 415, which is slidably connected to the inside of the body 1. One side of the back plate 415 is abutted with a swing fork 416. The middle part of the swing fork 416 is rotatably connected to the back of the body 1. A movable groove 414 is provided on the swing fork 416. A push rod 417 is slidably connected in the movable groove 414. A push rod 419 is connected to the push rod 417. The surface of the push rod 417 is slidably connected to a bracket 418. The bracket 418 is fixed to the side of the body 1. The bottom of the push rod 417 is connected to a reset spring through a connecting piece. The other end of the return spring 420 is fixed to the bracket 418. The blank is pushed into contact with the back plate 415 by manual thrust. The two back plates 415 slide back and forth. Then, the back plate 415 contacts one end of the swing fork 416, which drives the swing fork 416 to rotate. The lever principle drives the push rod 417 below the push rod 419 to slide within the bracket 418. The operator can directly determine whether the blank has been moved and placed in place based on the movement of the push rod 417 in front of the machine body 1. There are two back plates 415, and the two back plates 415 are slidably connected by a T-slot. The two back plates 415 are provided to prevent the blank from being pushed in at an angle, which would cause the back plate 415 to be in an inclined state. If one side of the two back plates 415 is in front of the other, the sliding lengths of the push rods 417 on both sides will be different. At this time, the operator can directly judge whether the position is tilted based on the forward movement distance of the two push rods 417, and use the tension of the return spring 420 to push the swing fork 416 to automatically rotate and extrude back to its position, thereby driving the back plate 415 to move forward and push the blank to the processing station.

[0037] It is worth noting that a right pressure plate 421 and a left pull plate 427 are also provided. The right pressure plate 421 and the left pull plate 427 are respectively fixed to the bottom of the two plate bodies 401. The right pressure plate 421 and the left pull plate 427 are both provided with bevels. The right pressure plate 421 and the left pull plate 427 are slidably connected to a movable plate 425. The movable plate 425 slides horizontally inside the body 1. The movable plate 425 is provided with a suction hole 426. A vacuum pump is provided inside the body 1, and the output end of the vacuum pump is connected to the movable plate 425 through a pipe. When the cylinder is extended to the limit position, it will synchronously drive the bottom right pressure plate 421 of the plate body 401 to move downward, and then slide into contact with the right side of the movable plate 425, thereby pushing the movable plate 425 to move left. After that, the suction channel is opened, and the suction force generated by the vacuum pump inside the body 1 will pass through the suction hole 426 through the bottom blister port of the blister mold 3 for blister processing, directly realizing the molding process.

[0038] It is worth noting that the bottom of the right pressure plate 421 is connected to a connecting frame 423, on which a plurality of telescopic columns 424 are installed, and the telescopic columns 424 are rotatably connected to pulleys. The telescopic columns 424 are slidably connected to the interior of the body 1 and abut against the bottom of the blister mold 3. A limit plate 422 is installed at the front of the body 1. Considering the removal of the product after blister molding, after the cylinder contracts and drives the connecting frame 423 to move up a certain height, it will also drive the blister mold 3 to rise a short height, and then be flush with the limit plate 422. Then, the operator can pull the blister mold 3 forward as a whole to remove the product inside. After removal, it continues to move backward and transfer it to the blister station. Then, as the cylinder repeats the next operation, after the connecting frame 423 moves down, the blister mold 3 will be re-locked in the slot formed by the limit plate 422, thereby automatically limiting the blister mold 3 in the front and back directions.

[0039] The working principle is that the operator first needs to insert the plastic blank between the plate body 401 and the baffle 23, and the roller on the slide 413 can facilitate the operator to slide the blank into place, and then the entire blank will be supported on the inserting vertebrae 409 on both sides and the frame plate 407 in the front and back directions. The side of the back of the blank will abut against the back plate 415, and the two back plates 415 will be pushed forward and backward by manual thrust. Then, the back plate 415 will abut against one end of the swing fork 416, which will drive the swing fork 416 to rotate. Using the principle of leverage, the push rod 417 under the push rod 419 will slide in the bracket 418. The operator can directly judge whether the blank has been moved and placed in place according to the movement of the push rod 417 in front of the body 1. The two back plates 415 are set to prevent the blank from being pushed in at an angle, which will cause the back plate 415 to be tilted. If the two back plates 415 are positioned one in front of the other, the sliding lengths of the push rods 417 on both sides will be different. At this time, the operator can directly judge whether the position is tilted according to the distance the two push rods 417 move forward, and use the tension of the reset spring 420 to push the swing fork 416 to automatically rotate and extrude back to its position, thereby driving the back plate 415 to move forward and push the blank to the processing station. Therefore, the overall process is that after the operator moves the blank to the station, the elastic reset movement of the back plate 415 pushes it back to the station, thereby realizing automatic positioning of the position. Afterwards, as the cylinder inside the body 1 expands and contracts, it will drive the entire upper pressure plate 21, the baffle 23 and the plate body 401 to move downward synchronously. Of course, before moving downward, the heating tube 22 is required to heat and soften the blank. After that, the softened blank is affected by the inserted vertebrae 409 on both sides and will not slide, so its position is relatively fixed. After moving downward, the entire softened blank will also move downward synchronously. After reaching a certain position, the resistance tooth plate 402 will first contact the plane at the bottom of the body 1 to form abutment, and then continue to move downward, which will drive the resistance tooth plate 402 to move upward, and then through the meshing relationship of the gears, drive the contraction tooth plate 408 to move downward, and then the contraction tooth plate 408 will drive the contraction plate 404 to move downward, and contract the contraction plate 404 and the inserted vertebrae 409 above into the interior of the plate body 401.Because the softened plastic is positioned by multiple inserts 409 at this time, if vacuum forming is performed at this time, it is easy to cause damage to the vacuum forming around the box body, so a retractable structure is designed as a whole. When vacuum forming is about to take place, the retractable plate 404 can be retracted to the inside by relying on the retractable structure to avoid damage. In order to prevent the product from appearing step-shaped after molding, after the retracted tooth plate 408 moves down, it will also drive the entire sliding pin 411 to move down. Because the sliding pin 411 slides in the inclined groove 412, it will drive the frame plate 407 to move forward according to the sliding of the inclined surface, and use the guidance of the slide rod 406 to achieve front and rear sliding limitation. Therefore, at this time, the frame plate 407 will move back and forth and will be separated from the softened blank. After separation, the softened blank will be directly attached to the upper edge position of the vacuum forming mold 3. Finally, when the cylinder reaches its limit of extension, it will synchronously drive the bottom right pressure plate 421 of the plate body 401 to move downward, and then make sliding contact with the right side of the movable plate 425, thereby pushing the movable plate 425 to move left. After that, the suction channel is opened, and the suction force generated by the vacuum pump inside the body 1 will pass through the suction hole 426 through the bottom blister port of the blister mold 3 to perform blister processing, directly completing the molding process. Later, when lifting, after the right pressure plate 421 is separated from the movable plate 425, the inclined surface of the left pull plate 427 will make sliding contact with the left side of the movable plate 425, thereby pushing the movable plate 425 to move right, thereby achieving reset, and re-blocking the position of the suction port to facilitate the next processing operation.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A positioning structure based on box blister, characterized in that: include Body (1); A lifting and heating component (2) is used to heat the plastic blank and realize the transfer of the blank up and down; A blister mold (3), used for making a mold for blistering a box body; A positioning component (4) is used to position the plastic blank before blister forming; The plastic absorbing mold (3) is arranged inside the machine body (1), and the lifting and heating component (2) is located above the plastic absorbing mold (3); The positioning assembly (4) comprises a placement positioning device and a back positioning device; The placement and positioning device realizes position positioning during the placement of the plastic blank; The back positioning device calibrates and positions the back position of the plastic blank.

2. A positioning structure based on box blister according to claim 1, characterized in that: The lifting and heating assembly (2) comprises a telescopic cylinder, which is installed inside the machine body (1); the output shaft of the telescopic cylinder is connected to an upper pressing plate (21); a heating tube (22) is installed at the bottom of the upper pressing plate (21); a baffle (23) is installed at the bottom of the upper pressing plate (21); and the heating tube (22) is located above the baffle (23).

3. A positioning structure based on box blister according to claim 2, characterized in that: The placement and positioning device comprises a plate body (401), the plate body (401) is connected to the blocking net (23) via a connecting piece, a retractable plate (404) is slidably connected inside the plate body (401), and a plurality of insert vertebrae (409) are installed on the retractable plate (404).

4. A positioning structure based on box blister according to claim 3, characterized in that: The retractable plate (404) is connected to a slide (413), and a roller is rotatably connected to the slide (413). The bottom of the retractable plate (404) is connected to a compression spring (410), and the bottom of the compression spring (410) is connected to the bottom of the machine body (1). The retractable plate (404) is fixedly connected to a retractable toothed plate (408), one side of the retractable toothed plate (408) is meshed with an intermediate gear (403), and one side of the intermediate gear (403) is meshed with a contact toothed plate (402), and the contact toothed plate (402) is slidably connected to the plate body (401) through a T-slot, and the intermediate gear (403) is rotatably connected to the plate body (401).

5. The positioning structure based on box blister according to claim 1, characterized in that: The front and rear sides of the plate body (401) are connected with a frame plate (407), and the frame plate (407) is connected with a slide bar (406), and the slide bar (406) is slidably connected to the inside of the plate body (401), and the surface of the slide bar (406) is located inside the plate body (401) and is sleeved with a contraction spring (405), and an inclined groove (412) is opened on the frame plate (407), and a sliding pin (411) is slidably connected inside the inclined groove (412), and one end of the sliding pin (411) is fixed to the side of the contraction tooth plate (408).

6. A positioning structure based on box blister according to claim 5, characterized in that: The back positioning device comprises a back plate (415), the back plate (415) is slidably connected to the inside of the machine body (1), one side of the back plate (415) is abutted against a swing fork (416), the middle part of the swing fork (416) is rotatably connected to the back of the machine body (1), a movable groove (414) is provided on the swing fork (416), a push rod (417) is slidably connected in the movable groove (414), a push rod (419) is connected to the push rod (417), a bracket (418) is slidably connected to the surface of the push rod (417), the bracket (418) is fixed to the side of the machine body (1), the bottom of the push rod (417) is connected to a reset spring (420) through a connecting piece, and the other end of the reset spring (420) is fixed to the bracket (418).

7. A positioning structure based on box blister according to claim 6, characterized in that: The number of the back plates (415) is two, and the two back plates (415) are slidably connected via a T-slot.

8. A positioning structure based on box blister according to claim 7, characterized in that: It also includes a right pressure plate (421) and a left pull plate (427), the right pressure plate (421) and the left pull plate (427) are respectively fixed on the bottom of the two plate bodies (401), the right pressure plate (421) and the left pull plate (427) are both provided with oblique angles, the right pressure plate (421) and the left pull plate (427) are slidably connected with a movable plate (425), the movable plate (425) slides horizontally inside the machine body (1), the movable plate (425) is provided with a suction hole (426), a vacuum pump is arranged inside the machine body (1), and the output end of the vacuum pump is connected to the movable plate (425) through a pipeline.

9. A positioning structure based on box blister according to claim 8, characterized in that: The bottom of the right pressure plate (421) is connected to a connecting frame (423), and a plurality of telescopic columns (424) are installed on the connecting frame (423). The telescopic columns (424) are rotatably connected to pulleys. The telescopic columns (424) are slidably connected to the inside of the machine body (1) and abut against the bottom of the blister mold (3). A limiting plate (422) is installed at the front of the machine body (1).

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