JP3504957B2 - Unnecessary head cutting device for synthetic resin containers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION In the molding of a synthetic resin container, an unnecessary head such as a cap is formed simultaneously on the upper part of the neck of the container during the molding process. There is. The present invention relates to an unnecessary head cutting device for a synthetic resin container for cutting an unnecessary head from an intermediate product in which an unnecessary head remains at an upper part of a neck. 2. Description of the Related Art Conventionally, as unnecessary head cutting means of a synthetic resin container of this kind, a neck member of a container is rotatably supported by a gripping member having a cutter, and the gripping member of the container is rotated by a rotating member. By applying a rotational force and a pressing force to the container via a part of the container protruding upward, the unnecessary head of the container is cut off from the flange by the cutter (Japanese Patent Publication No. 51-3436). Japanese Patent Application Laid-Open Publication No. Hei 2-23316) discloses a method in which a cutting head, which can be freely moved up and down and is rotatably driven, is fitted to the upper part of the container, and the unnecessary head is cut and removed by a built-in cutter by its rotation. Is known. In particular, in the latter conventional technique, a technical means is employed in which the shoulder contact portion formed on the cutting head is brought into contact with the shoulder portion of the container to keep the cutting position constant. [0003] However, the former prior art is not only applicable when the unnecessary head of the container does not have a collar portion, but also because the cutter is provided on each gripping member, There have been problems that maintenance for maintaining sharpness is troublesome, and the outer surface is easily damaged due to the rotation of the container. In the latter prior art, the cutter and its operating mechanism are incorporated in each cutting head, so that the structure is extremely complicated and costly, and maintenance of maintaining the sharpness of the cutter is required, as in the former prior art. There was a problem that it was very troublesome. The present invention has been made in view of such circumstances, and by configuring the cutter externally, the support mechanism for the container is simplified, the maintenance of the cutter is facilitated, and the cutting position by the cutter is reduced. It is an object of the present invention to provide an unnecessary head cutting device for a synthetic resin container that is not affected by variations in the molding of the container and variations in the dimensions of the holder. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a transfer mechanism provided with a biasing means for biasing a synthetic resin container upward, and a transfer mechanism synchronized with the transfer mechanism. And a neck support mechanism for stopping the rise of the container by contacting the upper surface of an appropriate step formed in the container and supporting the neck of the container, and a transfer mechanism for the container. A cutter for cutting unnecessary heads, and a chuck mechanism disposed above the neck support mechanism and gripping unnecessary heads protruding upward from the neck support mechanism. The unnecessary head is cut by the cutter in a state in which the unnecessary head is gripped, and the cut unnecessary head is discharged from a discharge unit separate from the container. In the present invention, the container is cut in a state where it is positioned by pressing the step of the container against the neck support mechanism. Therefore, the cutting position may vary depending on the molding of the container or the dimensions of the holder. It is always determined based on the step formed on the container without being affected by the variation. In addition, since the unnecessary head is cut off while the neck support mechanism supports the neck of the container and the chuck mechanism holds the unnecessary head of the container, deformation due to the cutting action can be suppressed. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a layout of one application example of the present invention. In the drawing, reference numeral 1 denotes an unnecessary head excision apparatus, and 2 denotes a mouth end face processing apparatus for finishing a cut surface thereof, which are connected via an intermediate star wheel 3, respectively. The container 6 transported in a state of being housed in the carrier on the conveyor 5 via the introduction star wheel 4 is introduced into the unnecessary head resection device 1 in the housed state. The introduced synthetic resin container 6 is used for the unnecessary head resection device 1 as described later.
After the unnecessary head is cut off by the cutter 7 disposed on the transfer path of the inner container, the transfer is made to the mouth end face processing device 2 via the intermediate star wheel 3. This mouth end face processing device 2
In, the cut surface of the container 6 is finished with an end face processing tool such as an end mill, and is conveyed onto a conveyor 9 via a discharge star wheel 8. In the drawing, 10 is a chute for discharging unnecessary heads remaining after cutting, 11 and 12 are dust collectors, 13 to 15 are dust collection ducts,
Numeral 16 denotes a reject storage portion of the container being processed during an emergency stop. FIG. 2 is a longitudinal sectional view showing a main part of the unnecessary head resection apparatus 1. As shown in FIG. In the figure, reference numeral 17 denotes a cylindrical fixed main shaft, and a rotary shaft tube 18 which is rotationally driven by a driving means (not shown) is loosely fitted outside the fixed main shaft 17.
Rotation supports 19 and 20 are fixed to the rotation shaft cylinder 18. On the lower rotating support 19, a predetermined number of mounting portions 21 incorporating a biasing means described later are provided. The container 6 introduced via the introduction star wheel 4 is a carrier 22
In this state, the sheets are sequentially placed on the receiver 21 and transported. FIG. 3 is a plan view showing an arrangement state of the mounting portion 21. The carrier 22 is placed on a lifting table 23 which is disposed at the center of each placing section 21 and is urged upward, and is transported while being supported by a support member 24 in front and back. Container 6 which is urged upward and transferred in this way
As shown in FIG. 2, a stepped portion 6b formed at a lower end portion of an upper neck portion 6a has an open / close holding piece 2 of a neck support mechanism 25 described later.
The positioning is performed by stopping the ascending by contacting the position 6. Further, the upper rotating support 20
A chuck mechanism 27 formed above the neck 6a during the molding process of the container 6 and gripping an unnecessary head 6c that is not required as a container is supported in a vertically movable manner. In the drawing, reference numeral 28 denotes an opening / closing drive shaft of the opening / closing holding piece 26 of the neck support mechanism 25. Next, the urging means of the lift 23 will be described. As shown in FIG. 4, a piston 29 constituting upward urging means is disposed below the elevating table 23. Pressure air is supplied to the pressure chamber 30 below the piston 29 through a supply pipe 31, and the lifting table 23 is urged upward by this pressure. Thereby, the container 6
As described above, the step portion 6b formed at the lower end portion of the neck portion 6a comes into contact with the opening / closing holding piece 26 of the neck portion support mechanism 25, and the ascent is stopped, whereby positioning is performed. This upward bias is controlled via a control valve mechanism (not shown) connected to the supply pipe 31 and the container 6
The supply of the compressed air is stopped near the introduction part and the discharge part, so that the upward bias is stopped. Next, the neck support mechanism 25 will be described. FIG. 5 is a plan view showing the neck support mechanism 25, and FIG. 6 is a longitudinal sectional view thereof. As shown in FIG. 5, the neck support mechanism 25 includes an appropriate number of opening / closing holding pieces 26 disposed around the apparatus. Each of the opening / closing holding pieces 26 includes a pair of opening / closing holding pieces 26a and 26b, and is configured to repeat the opening / closing operation in accordance with the rotation angle of the rotary shaft cylinder 18. Each of the opening / closing holding pieces 26a,
At the tip of 26b, the neck 6 of the container 6, as shown in FIG.
A semicircular rising portion 32 conforming to the shape of a is formed. In addition, each opening and closing holding piece 26a, 26b,
Opening / closing shafts 34a, 34 connected to opening / closing drive shafts 28a, 28b constituting the opening / closing drive shaft 28 via a shaft coupling 33.
It is mounted on opening and closing bodies 35a and 35b fixed to the upper part of b. The lower part of the opening / closing drive shaft 28 is rotatably supported by the rotary support 19 as shown in FIG. 4, and the lower part of one of the opening / closing drive shafts 28a is provided as shown in the bottom view of FIG. A drive lever 37 having a cam follower 36, an interlocking gear 38a, and a driven lever 39 are mounted.
The drive lever 37 is rotatably mounted on the open / close drive shaft 28a, and the interlocking gear 38a and the driven lever 39 are non-rotatably fixed. The drive lever 37 and the driven lever 39 are connected via a spring 40 so as to be elastically buffered. The interlocking gear 38a is provided below the other opening / closing drive shaft 28b.
Gear 38b is fixed so as not to rotate. In the figure, reference numeral 41 denotes a return spring attached to the opening / closing drive shaft 28b, and reference numeral 42 denotes a cam plate. FIG.
As shown in FIG. 5, the stopper member 4 located above the carrier 22 when closed below the opening / closing members 35a and 35b.
When the carrier 3 is provided, it is possible to prevent the carrier 22 from jumping when the carrier 22 is moved upward by the urging force when the carrier 22 is empty. When the cam follower 36 operates along the shape of the cam plate 42 based on the rotation of the rotary support 19, the rotation of the drive lever 37 accompanying the movement of the cam follower 36 causes the spring 4 to rotate.
0 to the driven lever 39. Thus, at the same time as the opening / closing drive shaft 28a rotates, the opening / closing drive shaft 28b rotates in the opposite direction via the gears 38a and 38b. With this rotation, the open / close shafts 34a, 34b are respectively provided.
The opening and closing holding pieces 26a and 26b are driven to open and close via the opening, and the neck 6a of the container 6 is held. The operation timing of controlling the supply of the pressurized air to the pressure chamber 30 of the piston 29 constituting the urging means is determined by the opening / closing holding piece 26.
a, 26b is closed to a certain extent by supplying pressure air to move the piston 29 upward to bring the step 6b of the container 6 into contact with the lower surfaces of the opening / closing holding pieces 26a, 26b, and thereafter further open / close holding pieces. The operation is good if the timing is set such that the necks 6a of the container 6 are clamped by the rising portions 32 of the containers 26a and 26b. The setting of this operation timing
Supply control of the pressure air to the pressure chamber 30 and the cam plate 4
Needless to say, this is performed depending on the relationship with the shape of No. 2. As described above, the step 6b of the container 6 is opened and closed by the urging means using the piston 29 and the like.
6b as well as pressing the opening / closing holding pieces 26a, 26a.
When the neck 6a of the container 6 is nipped by the rising portion 32 of the container 6b, the chuck mechanism 27 descends in parallel with this to grip the unnecessary head 6c, and as shown in FIG. L is transferred to the cutter 7 for cutting the unnecessary head 6c. Then, the container 6 is cut from a predetermined height set based on the step 6b. Thereafter, the container 6 from which the unnecessary head has been cut is transferred to the mouth end face processing device 2 via the intermediate star wheel 3, and the cut surface thereof is subjected to finishing. On the other hand,
The cut unnecessary head 6c is discharged from the discharge chute 10. Next, the chuck mechanism 27 for holding the unnecessary head 6c of the container 6 will be described. FIG. 9 is a vertical sectional view showing the chuck mechanism 27. The chuck mechanism 2
As shown in the figure, the mounting portion 7 is supported by the rotary support 20 and the rotary support 44 above the rotary support 20 via a lifting shaft 45 so as to be able to move up and down, and has a built-in biasing means disposed below. The robot moves up and down while rotating in synchronization with the support mechanism 21 and the neck support mechanism 25 to perform a gripping operation of the unnecessary head 6c. In the figure, reference numeral 46 denotes a cam shaft mounted on a support 47, which is rotated by the rotation of the rotary supports 20, 44 via a cam mechanism comprising a cam follower and a cam plate (not shown) attached to the cam shaft 46. The elevating shaft 45 moves up and down. Reference numeral 48 denotes a guide shaft relating to the elevating operation. A buffer spring 4 is provided below the elevating shaft 45.
9, a chuck 50 is mounted. The chuck portion 50 has a driving piston 51 built therein and is operated by pressure air supplied from a supply pipe 52. The lower end of the piston 51 is formed in a tapered shape, and the downward movement of the tapered portion presses the roller 54 of the rotation holding piece 53 to rotate about the support shaft 55. A fixed holding piece 56 is provided on the rear side in the transfer direction of the rotating holding piece 53, and the unnecessary head 6c is gripped by the two holding pieces 53, 56. The fixed holding piece 56 provides high rigidity in the moving direction component of the cutting action of the cutter 7. In addition, when the fixed holding piece 56 is installed, it can be slightly inclined in the direction of the blade portion of the cutter 7. In this case, the rigidity can be further increased with respect to a component perpendicular to the blade portion due to the cutting action of the cutter 7. In addition, the both holding pieces 5
It is also possible to provide a stopper means (not shown) capable of adjusting a buffer and an interval between the members 3 and 56 so that the interval between the two does not become smaller than a certain value. Needless to say, a side holding member or a side supporting member can be provided on the side of the holding members 53, 56. According to the present invention, the following effects can be obtained based on the above configuration. (1) The cutting position with respect to the container is always determined based on the step formed on the container regardless of the variation in molding and the variation in the dimensions of the holder. It is easy to cut the height of the end face uniformly. (2) The cutter for cutting unnecessary heads is arranged on the transfer path of the container, and is not incorporated in the neck support mechanism or the chuck mechanism for unnecessary heads. Maintenance such as sharpness is extremely easy. (3) Since the unnecessary head is cut off while holding the unnecessary head of the container by the chuck mechanism while supporting the neck of the container by the neck support mechanism, deformation of the mouth due to the cutting action is suppressed, and The cut unnecessary head can be discharged from a discharge part separate from the container.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a layout of an application example of the present invention. FIG. 2 is a longitudinal sectional view showing a main part of one embodiment of the present invention. FIG. 3 is a plan view showing a mounting portion of the container in the embodiment. FIG. 4 is a longitudinal sectional view of a mounting portion of the container. FIG. 5 is a plan view showing a neck support mechanism in the embodiment. FIG. 6 is a longitudinal sectional view of the neck support mechanism. FIG. 7 is a bottom view showing a driving portion of the neck support mechanism from below. FIG. 8 is a plan view showing an arrangement of cutters in the embodiment. FIG. 9 is a longitudinal sectional view showing a chuck mechanism in the embodiment. [Description of Signs] 1 ... unnecessary head cutting device, 2 ... mouth end face processing device, 6 ... container, 6a ... neck portion, 6b ... stepped portion, 6c ... unnecessary head, 7 ... cutter, 10 ... discharge chute, 11, 12 ... dust collector, 1
7: fixed main shaft, 18: rotary shaft cylinder, 21: mounting part, 22
... Carrier, 23 ... Elevator, 25 ... Neck support mechanism, 26
... Open / close holding piece, 27 ... Chuck mechanism, 28 ... Open / close drive shaft, 29 ... Piston, 45 ... Elevating shaft, 46 ... Cam shaft, 5
0: chuck part, 51: piston, 53: rotary holding piece,
55: support shaft, 56: fixed holding piece

Continuation of front page (56) References JP-A-55-79112 (JP, A) JP-A-47-25783 (JP, A) JP-A-59-31113 (JP, A) JP-B-44-9267 (JP, A) , B1) JP-B-48-23584 (JP, B1) JP-B-51-3436 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B26D 1/02 B29C 37/02

Claims (1)

(57) [Claim 1] A transfer mechanism having an urging means for urging a container made of synthetic resin upward, and moving in synchronization with the transfer mechanism and being formed on the container. And a neck support mechanism for stopping the rise of the container and supporting the neck of the container by contacting the upper surface of an appropriate stepped portion, and a cutter for cutting unnecessary heads disposed on the transfer path of the container. A chuck mechanism disposed above the neck support mechanism and gripping an unnecessary head projecting upward from the neck support mechanism, wherein the unnecessary head is gripped by the chuck mechanism while holding the unnecessary head. Wherein the unnecessary head is cut by the cutter, and the cut unnecessary head is discharged from a discharge unit separate from the container.