JP2000289096A - Apparatus for cutting gate of preform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize to cut a preform with a completely horizontal cut surface, by installing a cutter part in the same pitch as that of a recess for engaging the body of a preform, on a rotation plate for rotationally transferring the recess in a conveying passage and rotating about the same axis as that of a feed wheel, the cutter part having a pair of cutters facing each other and for nipping the preform when a rod is pushed upward. SOLUTION: A preform(pf) P is supplied through a chute 13, fed one by one to a conveying passage 17 with a claw of a feed wheel 23, transferred to a conveying passage 25 via a conveying mechanism 9 to be received by a claw 27c for further transfer. The pf P is latched on a guide rail 29 by the mouth part, raised gradually, inserted into the space between an upper feed wheel and a lower feed wheel by the rotation of the outer peripheral part of a feed wheel 31 while it is in the area between a horizontal surface 29b and a downward slope 29c, and received by a recess 31a of the feed wheel 31. In the conveying passage 30, a gate cutter part 33 just under the pf P pushes a rod upward against a force given by a coil spring to close the cutter and cuts the gate by clipping off from both sides. The gate can be cut completely with a horizontal cut surface and without leaving an uncut section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate cutting device for injection-molded preforms for axial stretching blow molding.

[0002]

2. Description of the Related Art Conventionally, a device for cutting a gate of a preform has been used to hold a mouth portion of an injection-molded preform and convey it to a position above a cutter. The rotary blade is pressed and cut. For example, as an example of horizontally moving a cutter, there is a "preform gate cutting method" disclosed in JP-A-4-232701. this is,
The preform is held above the mouth and transferred to above the gate cutter device, the cutter is raised, and then the cutter is moved horizontally by a driving device to cut the preform. As an example of cutting by pressing a rotary blade, Japanese Patent Application Laid-Open
No. 277322 describes "Method and apparatus for rotary gate cutting of preform". In this method, a rotating cutter is lowered and cut on a preform held by a fixing jig.

[0003]

As described above, any of the gate cutting methods generally used in the related art is a method of cutting a gate by moving a cutter from one direction, and has the following problems. That is, the gate is slightly deformed by the pressing force of the cutter because the side opposite to the side where the cutter comes into contact with the cutter to release the cutter is free without pressing. By this deformation, FIG.
As shown in (a), the gate G of the preform P cannot be cut horizontally and the cut surface A is inclined, or the gate G cannot be completely cut and a part thereof is hinged B.
And may remain in a state of being connected to the bottom surface of the preform P.

Accordingly, the present invention has been made to solve the above problems, and provides a preform gate cutting device capable of cutting a gate cut surface of a preform horizontally and completely cutting a gate. The purpose is to do.

[0005]

In order to achieve this object, a preform gate cutting device according to the present invention comprises a loading mechanism for loading a preform, and a cutting mechanism for cutting a gate while transporting the preform. And a discharge mechanism for discharging the preform from which the gate has been cut. The carry-in mechanism, a chute composed of a pair of guide bars having a predetermined gap so as to lock the mouth of the preform, and a conveyance path for locking the mouth of the preform carried from the chute, A conveyor provided with a feed arm so as to abut on the preform so as to be conveyed at a predetermined interval in the conveyance path. Further, the cutting mechanism is provided with a transport path that locks the mouth of the preform in an arc shape and communicates with the transport path of the loading mechanism, and an inclined surface and a horizontal surface that gradually ascend the transport mechanism side of the transport path. None, the feed wheel having a concave portion for fitting the body of the preform formed on the outer peripheral portion at a predetermined pitch is rotatably supported, and the concave portion is rotatable in the transport path. A gate cutter portion is attached to a rotating plate that rotates coaxially with the pitch of the concave portion, and the gate cutter portion has a caster at a lower end and a rod at an upper portion of a rod that is urged downward by a coil spring. A pair of cutters which are sandwiched when pushed up are provided facing each other. The caster is configured to travel on a rail having an inclined surface and a horizontal surface that gradually rises while the gate cutter unit is rotating during traveling, and the discharge mechanism is configured to lock an opening of the preform. A pair of guide bars is provided with a predetermined gap.

A transport mechanism is interposed between the carry-in mechanism and the cut mechanism. The transport mechanism has a transport path communicating with the transport path of the carry-in mechanism and the transport path of the cut mechanism. A feeder provided with claws protruding at the same pitch as the concave portion of the feeder, so that the claw of the feeder rotates in the transport path. Further, it is preferable that the gate cutter portion includes a butting plate that contacts the bottom of the preform above the pair of cutters. Further, a pair of cutters in the gate cutter portion are disposed on an upper surface of the rotating bracket via a fixed base that can move forward and backward, and a discharge groove for discharging a cut gate is provided below the cutter. Is preferred.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a plan view of the entire apparatus according to an embodiment of the present invention, with a part cut away, FIGS. 2 and 3 are a side view and a front view of a loading section for loading a preform, and FIG. 5 and 6 are a front view and a main part enlarged view showing a cutter mechanism, and FIG. 7 is a side view schematically showing the entire apparatus. FIG.
As shown in FIG.
A loading mechanism 7 for loading the preform P into the frame 5 erected on the gantry 3, a transport mechanism 9 for receiving the preform P from the loading mechanism 7 and transporting the preform P at a predetermined interval, and a transported preform. And a carrying-out mechanism 11 for discharging the preform from which the gate has been cut to the next step.

[0008] The preform P is conveyed while its mouth is locked in a continuous conveying path having a predetermined gap, and is conveyed by a feed arm protruding from a belt in the carry-in mechanism 7. The mechanism 10 is configured to be fitted on the outer peripheral portion of the feed wheel and to be conveyed by rotation of the feed wheel. Therefore, in the transport mechanism 9 and the cutting mechanism 10, the transport path is formed along the outer periphery of the feed wheel.

The loading mechanism 7 comprises a chute 13 for receiving the preform P from the previous process, and a conveyor 15 for separating and transporting the preform P one by one. The chute 13 has a pair of guide bars 13a, 1a spaced at a predetermined interval so as to lock the mouth of the preform P.
3a, and a pair of steady rest bars 13b disposed below the guide bars 13a, 13a to prevent the preform from swaying in the lateral direction. It is formed so as to be inserted, and is inclined so that the preform P slides down toward the conveyor 15. The steady bar 13b is integrally attached by inserting a bolt 13c fixed to the side surface into a through hole of a bracket 13d fixed to the side surface of the guide bar 13a, and screwing a nut 13e to the bolt 13c. Accordingly, an insertion groove 13f for inserting the preform P is formed by the pair of guide bars 13a and the steady bars 13b. The mouth of the preform P supplied to the insertion groove 13f is locked on the upper surface of the guide bar 13a, and the body is inserted between the steady rest bars 13b, and is carried into the conveyor 15 while sliding.

As shown in FIGS. 1 and 2, the conveyor 15 is provided with feed arms 19 that move in a transport path 17 for transporting the preform P at predetermined intervals. The transport path 17 includes a pair of horizontal plates 17a having a predetermined interval,
The mouth of the preform P formed by 17a and inserted into the transport path 17 is locked on the upper surface of the horizontal plate 17a.
The horizontal plate 17a and the pair of guide bars 13a are continuous, and the preform P sliding down from the insertion groove 13f is guided to the transport path 17 as it is. Feed arm 19
Are formed at a predetermined interval in a horizontal direction on a belt 21 wound between a pulley 20a and a pulley 20b rotatably supported on a vertical axis, and are formed at predetermined intervals in the horizontal direction. It is configured to convey while pressing P. The feed arm 19 is disposed below the pair of horizontal plates 17a so as to be engaged with the upper part of the preform P, and horizontally moves in the same direction integrally with the belt 21.

Further, a ratchet-shaped feed wheel 23 is pivotally supported between the upper surface of the pulley 20b and the horizontal plate 17a.
The ratchet wheel-like feed wheel 23 is rotatably mounted on a shaft coaxially with the pulley 20b, and has a claw 23a protruding from an outer peripheral portion. The claw 23a has a concave round surface on one side and a convex round surface on the opposite side, and protrudes in a cross shape by connecting the concave round surface and the convex round surface. Claw 23a
While rotating, the leading end is inserted between the preforms P in the insertion groove 13f and separated one by one and sent out to the transport path 17. At the same time that the preform P is separated by the claw 23a, the feed arm 19 that has been rotated and moved is located on the back surface of the preform P immediately after the separation, and the preform P sent to the transport path 17 is Then, the paper is successively transported one by one in the transport path 17 by the feed arm 19.

The transport mechanism 9 is an intermediate mechanism for reliably transferring the preform P to the cutting mechanism 10.
Claw wheel-shaped feed wheel 2 rotatably disposed below the transport path 25
7 is provided. The transport path 25 communicates with the transport path 17 in the loading mechanism 7 and is formed along the outer periphery of the ratchet-shaped feed wheel 27. The ratchet wheel-shaped feed wheel 27 includes:
As shown in FIG. 2 and FIG. 4, an upper feed wheel 27a and a lower feed wheel 27b are provided, and an interval between the feed wheels 27a and 27b in which an outer peripheral portion of the feed wheel of the cutting mechanism 10 described later can be inserted. Is provided. And the feeder 2
7a and the feed wheel 27b are each provided with, at a predetermined pitch, a claw 27c formed on the outer peripheral edge thereof as a convex round surface continuously from the concave round surface, similarly to the feed wheel 23.
c is formed so as to rotate in the transport path 25.

Further, a guide rail 29 is provided on the side of the transport path 25 connected to the cutting mechanism 10. The guide rails 29 are disposed on both sides of the transport path 25, and the upper surface is formed in a substantially trapezoidal shape in the traveling direction. In FIG. 1, the upper surface of the guide rail 29 is formed on a gradually rising inclined surface 29a in a range of L1, formed on a horizontal surface 29b in a range of L2, and gradually lowered in a range of L3.
c. As described above, the connection side of the transport path 25 with the cut mechanism 10 is formed in a substantially trapezoidal shape in the traveling direction, and once the preform P to be transferred is once raised, it can be smoothly transferred to the cut mechanism 10 side. it can.

The gate of the preform P received from the transport mechanism 9 is cut by a cutting mechanism 10. The cutting mechanism 10 includes a transport path 30 for transporting the preform P.
, A feed wheel 31 for transporting the preform P, and a gate cutter portion 33 disposed coaxially below the feed wheel 31 and rotating integrally with the feed wheel 31. The transport path 30 has a gap into which the preform P can be inserted, and communicates with the transport path 25, similarly to the transport path 17 and the transport path 25. As shown in FIG. 7, a guide rail 35 that lifts the preform P is provided on the side of the carrying-out mechanism 11 of the transport path 30. The guide rail 35 includes an inclined surface 35a whose upper surface gradually rises in the traveling direction and a horizontal surface 35b continuous from the inclined surface 35a. The guide rail 35 is disposed on both sides of the transport path 30 to close the mouth of the preform. Lock. The horizontal surface 35b is continuous with the discharge mechanism 11.

As shown in FIG. 1, the outer periphery of the feed wheel 31 extends from the horizontal surface 29b of the guide rail 29 to the downward inclined surface 29c in the transport path 30. It is arranged so as to overlap with the outer peripheral portion of 27, and as shown in FIG. 4, is inserted between the upper feed wheel 27a and the lower feed wheel 27b and rotates. Further, substantially semicircular concave portions 31a, 31a into which the body of the preform P is fitted are formed in the outer peripheral portion of the feed wheel 31.
The pitch of the concave portions 31a, 31a is the same as the pitch of the claw 27c of the feed wheel 27, and when rotating the overlapping portion of the feed wheel 31 and the feed wheel 27,
1a and the claw 27c coincide with each other, and
1, so that the preform P is delivered.

Below the feed wheel 31, a gate cutter 33 is disposed coaxially with the feed wheel 31. The gate cutter section 33 is attached at a predetermined interval to an outer peripheral portion of a rotary plate 36 coaxially supported with the feed wheel 31, and is disposed so as to be located below each of the concave portions 31a. The cutting section 37 is configured by inserting a vertically slidable rod 40 into a cylindrical body 39 fixed to the rotating plate 36, providing a cutter section 41 at an upper portion of the rod 40, and a caster 43 at a lower portion. A coil spring 45 is attached to the rod 40 between the lower surface 39a of the cylindrical body 39 and the stopper 40a, and the rod 40 is urged downward by the coil spring 45.

The cutter unit 41 is provided with a cutter 51 via a fixed base 50 which can move forward and backward on the upper surface of a bracket 49 which is rotatably attached to the upper end of the cylindrical body 30 by a shaft 47. The lower end is supported by mounting rods 52, 52 attached to the rod 40 by a shaft 53 by a shaft 54. Therefore, when the rod 40 moves up and down, the bracket 49 rotates and the cutter 51 opens and closes. The cutter 51 includes a bracket 4
Fixed base 5 movably mounted on the upper surface of 9
It is fitted in a groove formed on the upper surface of the “0” so as to be movable in the left-right direction, so that the contact position with the gate and the pinching force of the cutter 51 can be adjusted. Therefore, when the sharpness of the cutter 51 becomes poor, the hit position can be adjusted by moving the cutter 51 in the left-right direction. A bolt 55 screwed to the bracket 49 is in contact with the rear end surface of the cutter 51. The casters 43 provided at the lower end of the rod 40 run on rails 57. The rail 57 has an upper surface including an inclined surface 57a and a horizontal surface 57b, and is laid in the range of L5 in FIG. After the upper surface of the rail 57 shifts to the horizontal surface 57b, the inclined surface 35a of the guide rail 35 starts.

An abutment plate 59 that contacts the bottom surface of the preform P is attached to the cylinder 39 via an arm 60 above the cutter 51. The abutment plate 59 is horizontally fixed to the upper end of the arm 60, has a concave surface 59a formed on the upper surface so as to fit the bottom surface of the preform P, and has a through hole 59b for inserting a gate substantially at the center. Are drilled. The concave surface 59a and the through hole 59
b has a depth and a size such that the gate is sufficiently protruded and cut by the cutter 51 is possible.
The arm 60 can be moved up and down by an adjusting member such as a bolt projecting from the lower surface.
It is configured to be able to adjust the interval between the two.

Further, a discharge groove 61 for discharging the cut gate is provided below the cutter 51.
The discharge groove 61 is fixed by inclining a truncated chute 61 a and supporting a support plate 61 b fixed to an upper end portion on a shaft 47. The cutters 51 are disposed to face each other so as to straddle the chute 61a, and the cut gate is dropped onto the chute 61a and discharged.

When the rod 40 is urged downward by the coil spring 45, the lower end of the bracket 49 is pulled down through the mounting rods 52, 52, so that the shaft 47 is moved downward. At the center, the upper end of the bracket, ie, the cutter 51, opens outward. Conversely, when the rod 40 is pushed up against the coil spring 45, the lower end of the bracket 49 opens outward about the shaft 47, and the cutter 51 closes and meshes. Accordingly, when the caster 43 is disengaged from the rail 57, the rod 50 is urged downward by the coil spring 45, so that the cutter 50 is in an open state. The cutter 50
Closes and cuts through the gate.

When the caster 43 moves to the horizontal surface 57a of the rail 57, the mouth of the preform P is locked on the guide rail 35. Since the guide rail 35 has a gradually rising slope 35a, the slope 3
The preform P is gradually lifted by 5a. On the other hand, even if the gate of the preform is not completely cut off, it is held in a state of being sandwiched by the cutter 51, so that the gate of the preform is cut off by the rise of the preform, and the gate is completely cut off. The caster 43 comes off the rail 57 just before the preform P is delivered to the unloading mechanism 11. When the caster 43 comes off the rail 57, the coil spring 45 acts to push down the rod 40 and
0, and heads toward the transport mechanism 9 side. In this way,
Since the recesses 31a of the feed wheel 31 and the gate cutting device 33 are disposed vertically as a pair, the gate can be cut while the preform P is continuously transferred.

The unloading mechanism 11 has the same configuration as the loading mechanism 7 and is disposed below the guides 11a and a pair of guides 11a for locking the mouth of the preform P, thereby preventing the preform P from swaying. The tip is inclined downward so that the preform obtained by cutting the gate is discharged to the next step. A pair of guides 1
1a has an interval communicating with the transport path 30, and is integrally connected to the steady bar 11b by a bracket 11c. Therefore, the preform P transported from the transport path 30 has a pair of guides 11a after the gate is cut.
It is discharged while being locked by.

Next, the operation of the above configuration will be described.
When the preforms P are supplied from the chute 13, the preforms P are fed one by one into the transport path 17 by the claws 23 c of the feed wheel 23. At this time, when the preform P is fed into the transport path 17 by the claw 23c, almost simultaneously with the feeding arm 1
9 contacts the side surface of the preform P and pulleys 20a,
The transport mechanism 9 is driven by the driving of the belt 21 wound around
Transfer to In the transfer mechanism 9, the sheet is transferred to the transfer path 25 by the feed arm 19 and simultaneously transferred by the claw 27 c. The mouth of the preform P is gradually lifted up while being locked on the guide rail 29 while being transferred along the transfer path 25, and is moved between the upper feeder 27a and the lower feeder 27b from the horizontal surface 29b to the downward inclined surface 29c. The outer peripheral edge of the feed wheel 31 is inserted while rotating, so that it is delivered to the concave portion 31 a of the feed wheel 31.

When the preform P is transported in the transport path 30 by the rotation of the feed wheel 31, the gate cutter 33 disposed immediately below the preform P operates. That is,
The gate cutter unit 33 rotates and moves on the caster 4.
When 3 rides on the rail 57, the rod 40 is gradually pushed up against the urging force of the coil spring 45. When the rod 40 is pushed up, the bracket 49 is rotated about the shaft 47 in a direction in which the cutter 51 is closed. Further, the gate cutter unit 33 moves and the casters 43 move to the rails 57.
When the cutter 51 reaches the horizontal surface 57b, the cutter 51 is completely butted and cuts off the gate. In this way, the gate is sandwiched by the cutter 50 from both sides.

After the casters 43 move to the horizontal plane 57b, the mouth of the preform P is locked on the inclined surface 35a of the guide rail 35, and the preform P is lifted as it is. When the preform P is lifted, the gate is transported in a state of being urged downward while being sandwiched by the cutter 51. In the case of a gate that is not completely sandwiched, the gate is taken off, and the gate is completely removed. Can be separated. The preform P with the gate cut off
It is discharged by the discharge mechanism 11.

In the above embodiment, the transport mechanism 9 is provided to smoothly transfer the preform to the cutting mechanism 10, and may be omitted as appropriate. When the transport mechanism 9 is omitted, the cut mechanism 10 may be arranged continuously to the loading mechanism in place of the transport mechanism 9. In this case, the feed wheel 3 in the cutting mechanism 10
Rotating plate 36 with 1 and gate cutter 33 attached
Is rotated in the opposite direction to the embodiment, or the loading mechanism 7
May be arranged in the opposite direction.

[0027]

As is apparent from the above, according to the preform gate cutting device of the present invention, the cutter is disposed so as to sandwich the cutter from both sides, so that the cut surface of the gate is made horizontal. In addition, since the preform is lifted while the gate is sandwiched by the cutter, the preform can be completely cut without leaving any uncut portion.
Also, rotate the cutter at the same time as the preform,
Since the gate is cut while the preform is being conveyed, productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an entire device according to an embodiment of the present invention, with a portion cut away.

FIG. 2 is a side view for explaining a loading mechanism for loading a preform.

FIG. 3 is an explanatory front view of a loading mechanism for loading a preform.

FIG. 4 is an explanatory sectional view of a loading mechanism and a cutting mechanism.

FIG. 5 is a front view showing a gate cutter unit.

FIG. 6 is a front view showing a main part of a gate cutter unit.

FIG. 7 is a side view schematically showing the entire apparatus.

FIG. 8 is a cross-sectional view of a preform in which a gate is cut by a conventional method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gate cut device 3 gantry 5 frame 7 loading mechanism 9 transport mechanism 10 cutting mechanism 11 unloading mechanism 13 chute 13 a guide bar 13 b steady rest bar 13 c bolt 13 d bracket 13 e nut 13 f insertion groove 15 conveyor 17 transport path 17 a horizontal plate 19 feed arm 20 a , 20b Pulley 21 Belt 23 Claw wheel feeder 23a Claw 25 Conveyor path 27 Claw wheel feeder 27a Upper feeder 27b Lower feeder 27c Claw 29 Guide rail 30 Transport path 31 Feeder 33 Gate cutter 35 Guide rail 36 Rotation Plate 39 Tube 40 Rod 41 Cutter 43 Caster 45 Coil spring 47 Shaft 49 Bracket 50 Fixing table 51 Cutter 53, 54 Shaft 55 Bolt 57 Rail 59 Butt plate 60 Arm 61 Ejection groove Cap Computing unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AG07 BA03 BC02 BC12 BC17 BC21 BM05 BM09 BM12 BQ11 BQ12 BQ22 BQ32 4F208 AG07 LA02 LB01 LD05 LD12 LG03 LG15 LG28 LH01 LH19 LJ01 LJ30

Claims (4)

[Claims] 1. A loading mechanism for loading a preform, a cutting mechanism for cutting a gate while transporting the preform, and a discharging mechanism for discharging the preform from which the gate has been cut. A chute composed of a pair of guide bars with a predetermined gap so as to lock the mouth of the reform, a conveyance path for locking the mouth of the preform loaded from the chute, A conveyor provided with a feed arm protruding so as to convey at a predetermined interval in the conveyance path, and the cut mechanism provides a conveyance path for locking a mouth portion of the preform in an arc shape and performs the loading. The conveying path of the mechanism was connected to the conveying path, and the unloading mechanism side of the conveying path was formed with an inclined surface and a horizontal surface, and concave portions for fitting the body of the preform were formed at a predetermined pitch on the outer peripheral portion. The feed wheel is rotatably supported, and the recess is configured to rotate in the transport path. A gate cutter is mounted on a rotating plate that rotates coaxially with the feed wheel at the same pitch as the pitch of the recess. The gate cutter section has a pair of cutters facing each other when the rod is pushed up on the upper part of the rod which has a caster at a lower end and is urged downward by a coil spring, and the caster travels. During the rotation, the gate cutter section runs on a rail having an inclined surface and a horizontal surface that gradually rises during rotation, and the discharge mechanism opens a predetermined gap so as to lock the mouth of the preform. A preform gate cut device comprising a pair of guide bars. 2. A transport mechanism interposed between the loading mechanism and the cutting mechanism, wherein the transport mechanism has a transport path communicating with a transport path of the loading mechanism and a transport path of the cutting mechanism, and an outer peripheral portion having the transport mechanism. 2. A preform according to claim 1, further comprising a feed wheel provided with a claw protruding at the same pitch as a concave portion of the feed wheel of the cutting mechanism, so that the claw of the feed wheel rotates in a conveying path. Gate cutting device. 3. The preform gate cutting device according to claim 1, wherein the gate cutter unit has an abutment plate that contacts the bottom of the preform above the pair of cutters. 4. A pair of cutters in the gate cutter portion are disposed on an upper surface of a rotating bracket via a fixed base that can move forward and backward, and a discharge groove for discharging a cut gate is provided below the cutter. The gate cutting device for a preform according to any one of claims 1 to 3, wherein a gate cutting device is provided.