CN110978863A

CN110978863A - Mechanical pencil movement assembly production line

Info

Publication number: CN110978863A
Application number: CN202010036804.2A
Authority: CN
Inventors: 孙敏
Original assignee: Guangdong Oulta Automation Equipment Co ltd
Current assignee: Guangdong Oulta Automation Equipment Co ltd
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-04-10
Anticipated expiration: 2040-01-14
Also published as: CN110978863B

Abstract

The invention provides an assembly production line of mechanical pencil cores, which belongs to the technical field of mechanical pencil core assembly and comprises a bottom box and a support arranged at the bottom of the bottom box, wherein an arc-shaped rail conveying mechanism is arranged at the upper part of the bottom box and comprises a chain driven by a divider to operate and a plurality of assembly dies arranged on the chain, a positioning buckle used for being matched with the assembly dies is arranged at the outer side of the chain, and a locking shaft and a locking cylinder driving the locking shaft to rotate are arranged at the bottom of the chain. In the embodiment of the invention, the automatic feeding and assembling of the movable head, the spring, the screw head and the core pipe can be realized through the arrangement of the movable head feeding mechanism, the spring feeding mechanism, the screw head feeding mechanism and the core pipe feeding mechanism, and the detection mechanism is matched in each assembling link, so that the assembling precision can be improved, the conditions of wrong assembly and neglected assembly are avoided, and the advantages of high assembling efficiency and high automation degree are achieved.

Description

Mechanical pencil movement assembly production line

Technical Field

The invention belongs to the technical field of mechanical pencil movement assembly, and particularly relates to a mechanical pencil movement assembly production line.

Background

The mechanical pencil core comprises a plurality of parts, such as a spring, a movable head, a screw head, a core tube and the like, and the parts need to be assembled after being produced. At present, the equipment to above-mentioned spare part relies on mechanical equipment to accomplish mostly, but current equipment has the low and not high scheduling problem of assembly efficiency of packaging efficiency and assembly accuracy to lead to current equipment can't satisfy the user demand, influence the production progress of propelling pencil core.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problem to be solved by the embodiment of the invention is to provide an assembly production line of the mechanical pencil movement.

In order to solve the technical problems, the invention provides the following technical scheme:

an assembly production line for mechanical pencils comprises a bottom case and a support arranged at the bottom of the bottom case, wherein an arc-shaped rail conveying mechanism is arranged at the upper part of the bottom case and comprises a chain driven by a divider to operate and a plurality of assembly dies mounted on the chain, a positioning buckle matched with the assembly dies is arranged on the outer side of the chain, a locking shaft and a locking cylinder driving the locking shaft to rotate are arranged at the bottom of the chain, and a locking swing rod corresponding to the positioning buckle is fixedly arranged on the locking shaft; the under casing top still has set gradually first feed mechanism of activity, first combination detection mechanism, spring feed mechanism, second combination detection mechanism, the first feed mechanism of thread, third combination detection mechanism, core pipe feed mechanism, fourth combination detection mechanism and discharge end.

As a further improvement of the invention: the first feed mechanism of activity includes two sets of first vibration discs of activity, and is two sets of be provided with the first flat guide rail that shakes of activity between the first vibration disc of activity, the one end that the first vibration disc of activity was kept away from to the first flat guide rail that shakes of activity is provided with the first suction nozzle of second activity of taking out upper and lower cylinder control by the activity head, the first suction nozzle top of second activity is provided with activity head pipeline delivery valve, and second activity head suction nozzle bottom one side is provided with activity head dislocation cylinder, and one side that the first vibration disc of second activity suction nozzle was kept away from to the first suction nozzle of activity is provided with and places the first suction nozzle of first activity of sideslip cylinder driven by the activity head, first stopper is installed on first activity head suction nozzle upper portion, first stopper side is.

As a further improvement of the invention: spring feed mechanism includes the spring vibration dish of two sets of relative settings, and is two sets of be provided with spring unloading track between the spring vibration dish, spring unloading track upper portion is provided with the spring apron, and one side that spring vibration dish was kept away from to spring unloading track is provided with the spring suction nozzle, the spring suction nozzle top is provided with spring pipeline delivery valve, spring pipeline delivery valve one side below is provided with the cylinder board, and the seat is extended in the installation of spring pipeline delivery valve opposite side below, extend seat upper portion and install the second stopper, extend seat side and set up the second buffer, extend seat bottom and first guide rail sliding fit, first guide rail lower part links to each other with first support pole through the slide rail seat, first support pole bottom is connected with first line rail base through first line rail support.

As a further improvement of the invention: the screw thread head feeding mechanism comprises two groups of screw thread head vibration discs, a screw thread head conveying track is arranged between the screw thread head vibration discs, a screw thread head cover plate is arranged above the screw thread head conveying track, an air cylinder connected to an air cylinder seat is arranged at one end, away from the screw thread head vibration discs, of the screw thread head conveying track, a supporting seat capable of moving along a second guide rail is arranged on one side, away from the screw thread head vibration discs, of the air cylinder seat, a third buffer is further arranged on the supporting seat, a screw thread head suction nozzle is arranged below the second guide rail, the air cylinder seat is connected with a second wire track base through a second wire track support, and a second support rod is mounted on the second wire track support.

As a still further improvement of the invention: the core pipe feed mechanism comprises a protection plate and two groups of workbin front lower plates and two groups of workbin front upper plates, wherein the two groups of workbin front lower plates and the two groups of workbin front upper plates are arranged above the protection plate, movable feeding plates are arranged on the side of the protection plate, a first motor is arranged at the bottom of each movable feeding plate, the two groups of workbin front lower plates and the two groups of workbin front upper plates are connected through connecting rods, and a base and a second motor are arranged on the side of each workbin front upper.

As a still further improvement of the invention: the first motor is a stepping motor, and the second motor is an alternating current motor.

As a still further improvement of the invention: first subassembly detection mechanism, second subassembly detection mechanism, third subassembly detection mechanism and fourth subassembly detection mechanism structure are the same, all include roof and bottom plate and detect the cylinder, link to each other through a plurality of guide bars between roof and the bottom plate, be provided with on the guide bar and remove the seat, remove the seat through square flange linear bearing with guide bar sliding fit, it drives to detect the cylinder remove the seat and follow the guide bar removes, it is provided with the clamp plate to remove seat side, the clamp plate bottom is provided with the detector, and the clamp plate below is provided with the detection cover, it is connected with the detection head through detecting the pole to detect cover bottom.

As a still further improvement of the invention: and a fourth buffer is arranged at the upper part of the movable seat.

Compared with the prior art, the invention has the beneficial effects that:

in the embodiment of the invention, the automatic feeding and assembling of the movable head, the spring, the screw head and the core pipe can be realized through the arrangement of the movable head feeding mechanism, the spring feeding mechanism, the screw head feeding mechanism and the core pipe feeding mechanism, and the detection mechanism is matched in each assembling link, so that the assembling precision can be improved, the conditions of wrong assembly and neglected assembly are avoided, and the advantages of high assembling efficiency and high automation degree are achieved.

Drawings

Fig. 1 is a schematic structural view of an assembly line of mechanical pencil movements.

Fig. 2 is a schematic structural view of a circular arc track conveying mechanism in an assembly production line of mechanical pencil movements.

Fig. 3 is a schematic structural diagram of a movable head feeding mechanism in an automatic pencil movement assembly production line.

Fig. 4 is a schematic structural diagram of a spring feeding mechanism in an assembly line of mechanical pencil movements.

Fig. 5 is a schematic structural diagram of a thread head feeding mechanism in an assembly line of a mechanical pencil core.

Fig. 6 is a schematic structural diagram of a core tube feeding mechanism in an assembly line of mechanical pencil cores.

Fig. 7 is a schematic structural diagram of a combination detecting mechanism in an assembly line of a mechanical pencil lead.

In the figure: 1-movable head feeding mechanism, 2-first assembly detection mechanism, 3-spring feeding mechanism, 4-second assembly detection mechanism, 5-screw head feeding mechanism, 6-third assembly detection mechanism, 7-bottom box, 8-support, 9-core pipe feeding mechanism, 10-box door, 11-fourth assembly detection mechanism, 12-discharge end, 13-storage box, 14-divider, 15-chain, 16-assembly mould, 17-positioning buckle, 18-locking shaft, 19-locking cylinder, 20-locking swing rod, 21-movable head vibrating disk, 22-movable head pipeline conveying valve, 23-movable head taking-out upper and lower cylinders, 24-movable head dislocation cylinder, 25-first limiting block, 26-a first buffer, 27-a first floating joint, 28-a first movable head suction nozzle, 29-a movable head placing transverse moving air cylinder, 30-a second movable head suction nozzle, 31-a movable head flat vibration guide rail, 32-a spring vibration disc, 33-a first linear rail support, 34-a first linear rail base, 35-a first support rod, 36-a first guide rail, 37-a slide rail base, 38-an extension base, 39-a second buffer, 40-a second limit block, 41-a spring pipeline delivery valve, 42-a spring blanking track, 43-an air cylinder plate, 44-a spring cover plate, 45-a screw thread head vibration disc, 46-a screw thread head cover plate, 47-an air cylinder base, 48-a support base, 49-a second guide rail, 50-a third buffer, 51-a screw thread head suction nozzle, 50-a screw thread head suction nozzle, 52-a second support rod, 53-a second linear rail support, 54-a second linear rail base, 55-a first motor, 56-a protection plate, 57-a bin front lower plate, 58-a movable feeding plate, 59-a bin front upper plate, 60-a second motor, 61-a base, 62-a connecting rod, 63-a fourth buffer, 64-a square flange linear bearing, 65-a pressing plate, 66-a detector, 67-a detection sleeve, 68-a detection cylinder, 69-a detection rod and 70-a detection head.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1 to 7, the present embodiment provides an assembly line for a mechanical pencil, including a bottom case 7 and a support 8 disposed at the bottom of the bottom case 7, wherein an arc-shaped rail transportation mechanism is disposed at the upper portion of the bottom case 7, specifically, the arc-shaped rail transportation mechanism includes a chain 15 driven by a divider 14 and a plurality of assembly molds 16 mounted on the chain 15, a positioning buckle 17 for cooperating with the assembly molds 16 is disposed at the outer side of the chain 15, a locking shaft 18 and a locking cylinder 19 for driving the locking shaft 18 to rotate are disposed at the bottom of the chain 15, and a locking swing rod 20 corresponding to the positioning buckle 17 is fixedly disposed on the locking shaft 18.

The chain 15 is driven by the divider 14 to move, so that the assembly die 16 is driven to move, the locking cylinder 19 drives the locking shaft 18 to rotate, and then the locking oscillating bar 20 is driven to rotate, so that the locking oscillating bar 20 is buckled into the positioning buckle 17, and the accurate positioning of the assembly die 16 is realized.

Further, a movable head feeding mechanism 1, a first assembly detection machine 2, a spring feeding mechanism 3, a second assembly detection mechanism 4, a thread head feeding mechanism 5, a third assembly detection mechanism 6, a core pipe feeding mechanism 9, a fourth assembly detection mechanism 11 and a discharge end 12 are sequentially arranged above the bottom box 7.

Specifically, the first feed mechanism 1 that moves about includes two sets of first vibration dishes 21 that move about, and is two sets of be provided with the first flat guide rail that shakes of activity 31 between the first vibration dish 21 that moves about, the first one end that the first vibration dish 21 was kept away from to the first flat guide rail that shakes of activity 31 is provided with the first suction nozzle 30 that moves about of second that takes out upper and lower cylinder 23 control by the activity head, the first suction nozzle 30 top that moves about of second is provided with first pipeline delivery valve 22 that moves about, and first suction nozzle 30 bottom one side that moves about of second is provided with the first dislocation cylinder 24 that moves about, and the first suction nozzle 28 that moves about that the first suction nozzle 30 was kept away from to the first vibration dish 21 that moves about is provided with and places sideslip cylinder 29 driven first movable head suction nozzle 28 by the activity head, first stopper 25 is installed on first.

The movable head is conveyed to the second movable head suction nozzle 30 from the movable head flat vibration guide rail 31 through the movable head vibration disc 21, vacuum and air blowing treatment is applied through the movable head pipeline conveying valve 22, the movable head is moved to the first movable head suction nozzle 28 from the second movable head suction nozzle 30, the upper and lower air cylinders 23 are taken out through the movable head, and the accuracy of material taking and discharging of the movable head can be guaranteed through the arrangement of the movable head taking-out and placing-transverse air cylinder 29.

Specifically, the spring feeding mechanism 3 includes two sets of spring vibration disks 32 arranged oppositely, a spring blanking track 42 is arranged between the two sets of spring vibration disks 32, a spring cover plate 44 is arranged at the upper part of the spring blanking track 42, a spring suction nozzle is arranged at one side of the spring blanking track 42 far away from the spring vibration disk 32, a spring pipeline delivery valve 41 is arranged above the spring suction nozzle, a cylinder plate 43 is arranged below one side of the spring pipeline delivery valve 41, an extension seat 38 is arranged below the other side of the spring pipeline delivery valve 41, a second limiting block 40 is arranged at the upper part of the extension seat 38, a second buffer 39 is arranged at the side of the extension seat 38, the bottom of the extension seat 38 is in sliding fit with the first guide rail 36, the lower part of the first guide rail 36 is connected with the first support rod 35 through a slide rail seat 37, and the bottom of the first support rod 35 is connected with the first wire rail base 34 through the first wire rail support 33.

The springs are conveyed to the suction nozzles through the spring vibration disc 32 through the spring discharging rails 42, the extending seats 38 are driven by the air cylinders to slide on the first guide rails 36, the positions of the spring pipeline conveying valves 41 are adjusted, the spring pipeline conveying valves 41 are located right above the spring suction nozzles, the air cylinders drive the spring suction nozzles to move up and down, and automatic feeding of the springs is achieved.

Specifically, the thread head feeding mechanism 5 comprises two groups of thread head vibration discs 45, a thread head conveying track is arranged between the two groups of thread head vibration discs 45, a thread head cover plate 46 is arranged above the thread head conveying track, an air cylinder connected to an air cylinder seat 47 is arranged at one end, away from the thread head vibration discs 45, of the thread head conveying track, a supporting seat 48 capable of moving along a second guide rail 49 is arranged on one side, away from the thread head vibration discs 45, of the air cylinder seat 47, a third buffer 50 is further arranged on the supporting seat 48, a thread head suction nozzle 51 is arranged below the second guide rail 49, the air cylinder seat 47 is connected with a second thread rail base 54 through a second thread rail support 53, and a second support rod 52 is mounted on the second thread rail support 53.

Carry the thread head to thread head suction nozzle 51 below by thread head delivery track through thread head vibration dish 45, drive supporting seat 48 through the cylinder and remove along second guide rail 49, utilize thread head suction nozzle 51 to adsorb the thread head, adjust the automatic feeding of thread head can be accomplished to thread head suction nozzle 51's pressure.

Concretely, core pipe feed mechanism 9 includes guard plate 56 and sets up hypoplastron 57 and two sets of workbin front upper plate 59 before two sets of workbin of guard plate 56 top, guard plate 56 side is provided with movable upper plate 58, movable upper plate 58 bottom is provided with first motor 55, and is two sets of hypoplastron 57 and two sets of before the workbin link to each other through connecting rod 62 between the workbin front upper plate 59, workbin front upper plate 59 side is provided with base 61 and second motor 60.

The second motor 60 drives the core tube to swing, the first motor 55 drives the movable feeding plate 58 to move left and right, and the moving speed of the movable feeding plate 58 is adjusted to realize automatic feeding of the core tube.

Specifically, the first motor 55 is a stepping motor, and the second motor 60 is an ac motor.

Specifically, first combination detection mechanism 2, second combination detection mechanism 4, third combination detection mechanism 6 and the 11 structures of fourth combination detection mechanism are the same, all include roof and bottom plate and detect cylinder 68, link to each other through a plurality of guide bars between roof and the bottom plate, be provided with the removal seat on the guide bar, the removal seat through square flange linear bearing 64 with guide bar sliding fit, it drives to detect cylinder 68 the removal seat is followed the guide bar removes, it is provided with clamp plate 65 to remove seat side, clamp plate 65 bottom is provided with detector 66, and clamp plate 65 below is provided with detects cover 67, it is connected with detection head 70 through detecting pole 69 to detect cover 67 bottom.

The movable seat is driven to move up and down along the guide rod through the detection air cylinder 68, so that the pressing plate 65, the detector 66, the detection sleeve 67, the detection rod 69 and the detection head 70 are driven to move up and down, all links in the assembly process of the mechanical pencil movement are combined and detected, the detection conditions are distinguished by the detector 66 and the detection sleeve 67, and meanwhile the pressing of parts in all links is completed by the pressing plate 65.

Further, a fourth buffer 63 is installed on the upper portion of the movable base.

The working principle of the embodiment is as follows: the chain 15 is driven by the divider 14 to move, so that the assembly die 16 is driven to move, the locking cylinder 19 drives the locking shaft 18 to rotate, and then the locking oscillating bar 20 is driven to rotate, so that the locking oscillating bar 20 is buckled into the positioning buckle 17, and the accurate positioning of the assembly die 16 is realized.

The movable seat is driven to move up and down along the guide rod through the detection air cylinder 68, so that the pressing plate 65, the detector 66, the detection sleeve 67, the detection rod 69 and the detection head 70 are driven to move up and down, all links in the assembly process of the mechanical pencil movement are combined and detected, the detection conditions are distinguished by the detector 68 and the detection sleeve 67, and meanwhile the pressing of parts in all links is completed by the pressing plate 65.

In another embodiment, a door 10 is disposed on a side surface of the bottom case 7, and a storage box 13 is disposed on one side of an upper portion of the bottom case 7.

In the embodiment of the invention, the automatic feeding and assembling of the movable head, the spring, the screw thread head and the core pipe can be realized by arranging the movable head feeding mechanism 1, the spring feeding mechanism 3, the screw thread head feeding mechanism 5 and the core pipe feeding mechanism 9, and the detection mechanism is matched in each assembling link, so that the assembling precision can be improved, the conditions of wrong assembly and neglected assembly are avoided, and the advantages of high assembling efficiency and high automation degree are achieved.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. The mechanical pencil movement assembly production line is characterized by comprising a bottom box (7) and a support (8) arranged at the bottom of the bottom box (7), wherein an arc-shaped rail conveying mechanism is arranged at the upper part of the bottom box (7), the arc-shaped rail conveying mechanism comprises a chain (15) driven by a divider (14) to operate and a plurality of assembly molds (16) installed on the chain (15), a positioning buckle (17) matched with the assembly molds (16) is arranged at the outer side of the chain (15), a locking shaft (18) and a locking cylinder (19) driving the locking shaft (18) to rotate are arranged at the bottom of the chain (15), and a locking swing rod (20) corresponding to the positioning buckle (17) is fixedly arranged on the locking shaft (18);

the screw thread automatic feeding device is characterized in that a movable head feeding mechanism (1), a first assembly detection mechanism (2), a spring feeding mechanism (3), a second assembly detection mechanism (4), a screw thread head feeding mechanism (5), a third assembly detection mechanism (6), a core pipe feeding mechanism (9), a fourth assembly detection mechanism (11) and a discharge end (12) are sequentially arranged above the bottom box (7).

2. The assembly production line of the mechanical pencil of claim 1, wherein the feeding mechanism (1) comprises two sets of movable head vibration discs (21), a movable head flat vibration guide rail (31) is arranged between the two sets of movable head vibration discs (21), one end of the movable head flat vibration guide rail (31) far away from the movable head vibration discs (21) is provided with a second movable head suction nozzle (30) controlled by a movable head taking-out upper and lower air cylinder (23), a movable head pipeline delivery valve (22) is arranged above the second movable head suction nozzle (30), one side of the bottom of the second movable head suction nozzle (30) is provided with a movable head dislocation air cylinder (24), one side of the second movable head suction nozzle (30) far away from the movable head vibration discs (21) is provided with a first movable head suction nozzle (28) driven by a movable head placing traversing air cylinder (29), and a first limiting block (25) is arranged on the upper portion of the first movable head suction nozzle (28), a first buffer (26) is arranged on the side of the first limiting block (25).

3. The mechanical pencil movement assembly line of claim 1, wherein the spring feeding mechanism (3) comprises two sets of spring vibration discs (32) which are oppositely arranged, a spring blanking track (42) is arranged between the two sets of spring vibration discs (32), a spring cover plate (44) is arranged on the upper portion of the spring blanking track (42), a spring suction nozzle is arranged on one side, away from the spring vibration discs (32), of the spring blanking track (42), a spring pipeline conveying valve (41) is arranged above the spring suction nozzle, an air cylinder plate (43) is arranged below one side of the spring pipeline conveying valve (41), an extension seat (38) is arranged below the other side of the spring pipeline conveying valve (41), a second limiting block (40) is arranged on the upper portion of the extension seat (38), a second buffer (39) is arranged on the side of the extension seat (38), and the bottom of the extension seat (38) is in sliding fit with the first guide rail (36), the lower part of the first guide rail (36) is connected with a first support rod (35) through a sliding rail seat (37), and the bottom of the first support rod (35) is connected with a first wire track base (34) through a first wire track support (33).

4. The mechanical propelling pencil movement assembly line according to claim 1, wherein the thread head feeding mechanism (5) comprises two groups of thread head vibration discs (45), a thread head conveying track is arranged between the two groups of thread head vibration discs (45), a thread head cover plate (46) is arranged above the thread head conveying track, an air cylinder connected to an air cylinder seat (47) is arranged at one end of the thread head conveying track away from the thread head vibration discs (45), a supporting seat (48) capable of moving along a second guide rail (49) is arranged at one side of the air cylinder seat (47) away from the thread head vibration discs (45), a third buffer (50) is further arranged on the supporting seat (48), a thread head suction nozzle (51) is arranged below the second guide rail (49), and the air cylinder seat (47) is connected with a second wire rail base (54) through a second wire rail support seat (53), a second support rod (52) is mounted on the second wire support (53).

5. The mechanical pencil core assembly line of claim 1, wherein the core tube feeding mechanism (9) comprises a protection plate (56), two groups of bin front lower plates (57) and two groups of bin front upper plates (59) which are arranged above the protection plate (56), a movable feeding plate (58) is arranged on the side of the protection plate (56), a first motor (55) is arranged at the bottom of the movable feeding plate (58), the two groups of bin front lower plates (57) and the two groups of bin front upper plates (59) are connected through a connecting rod (62), and a base (61) and a second motor (60) are arranged on the side of the bin front upper plate (59).

6. A mechanical pencil movement assembly line according to claim 5, characterized in that said first motor (55) is a stepping motor and said second motor (60) is an AC motor.

7. A mechanical pencil movement assembly line as recited in claim 1, the first assembly detection mechanism (2), the second assembly detection mechanism (4), the third assembly detection mechanism (6) and the fourth assembly detection mechanism (11) have the same structure and respectively comprise a top plate, a bottom plate and a detection cylinder (68), the top plate is connected with the bottom plate through a plurality of guide rods, the guide rods are provided with moving seats, the moving seat is in sliding fit with the guide rod through a square flange linear bearing (64), the detection air cylinder (68) drives the moving seat to move along the guide rod, a pressing plate (65) is arranged on the side of the moving seat, a detector (66) is arranged at the bottom of the pressing plate (65), a detection sleeve (67) is arranged below the pressing plate (65), the bottom of the detection sleeve (67) is connected with a detection head (70) through a detection rod (69).

8. A mechanical pencil movement assembly line according to claim 7, characterized in that a fourth buffer (63) is mounted on the upper portion of the mobile seat.