US3163095A

US3163095A - Slotting tool

Info

Publication number: US3163095A
Authority: US
Inventors: Sheeran Lloyd Alan
Original assignee: RITE SIZE CORRUGATED MACHINERY
Current assignee: RITE-SIZE MACHINERY Inc; RITE SIZE CORRUGATED MACHINERY; RITE-SIZE CORRUGATED MACHINERY Co
Priority date: 1962-10-09
Filing date: 1962-10-09
Publication date: 1964-12-29
Anticipated expiration: 1981-12-29

Description

L. A. SHEERAN SLOTTING TOOL Dec. 29, 1964 2 Sheets-Sheet 1 Filed Oct. 9, 1962 INVENTOR. LLOYD A. SH EE RAN H 1,4 0: ATTORN EYS L. A. SHEERAN Dec. 29, 1964 SLOTTING TOOL 2 Sheets-Sheet 2 Filed Oct. 9. (1962 2' 4 4ww w Fl-G. 5

United States Patent Ofidce 3,163,095 SLOTTING TOOL Lloyd Alan Sheer-an, Cranston, R.I., assignor to Rite-Size Corrugated Machinery Co., a corporation of Rhode Island Filed Oct. 9, 1962, Ser. No. 229,452 2 Claims. (Cl. 93-58.3)

This invention relates to slotting tools for use with box blank forming machines which are formed in conjunction with a creaser bar into a unitary tool structure.

In the prior art there exist a number of slotting and creaser bar tools which are useful in conjunction with forming blanks of corrugated board which are of one or two ply thickness. However, when the thickness of the board is increased into three or four ply, certain problems arise particularly with the folding of this relatively thick structure. This comes about since the creaser tool portions used in the prior art form a single line crease, and it becomes structurally impossible to fold a thick three or four ply corrugated board on a single line. It is accordingly necessary to provide a different form of creaser for use with slotting tools for operation on three or four ply board.

It is accordingly the main object of this invention to provide a combined slotting tool and creaser bar construction which will form two creases at either side of a slot.

A further object of the invention is to provide a creaser bar construction in conjunction with a slotting tool which resiliently engages the wall of the board so as to gradually crush the same or emboss it.

With these and other objects in view, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claims.

In the drawings:

FIG. 1 is a plan view of a box blank having slots and creaser lines of the type adapted to be cut and formed by the tool of the instant invention;

FIG. 2 is a fragmentary sectional view illustrating a portion of the machine utilizing the toolin the instant invention;

FIG. 3 is a fragmentary elevational view of a portion of the tool adjacent one end thereof;

FIG. 4 is a sectional View taken on lines 4-4 of :FIG. 3;

FIG. 5 is a similar view showing the tool in engaging position at the end of its stroke in the machine;

FIG. 6 is a sectional view taken on line 6-6 of FIG. 3;

FIG. 7 is a diagrammatic view illustrating the manner in which the crease is formed;

FIG. 8 shows a crease formed with the tool of FIG. 7

folded;

FIG. 9 is a diagrammatic view similar to FIG. 7 showing an alternate form of tool;

FIG. 10 shows a box blank folded with the creaser in FIG. 9 utilized;

box blank may be widely varied, but as shown for a I usual form of box it has longitudinal crease lines 16l6 which extend parallel to and inwardly of the side edges. Transverse slots 17 extend inwardly from the side edges to terminate at the crease line 16-16, and between each 3,1fi3fi95 Patented Dec. 29, 1964 pair of slots 17-17 there are formed transverse crease lines 1813 in spaced relationship to each other extending between the slots 17 on a line that can be generally referred to as the transverse edge of the slot 17.

The box blank forming machine referred to in the above mentioned Hose patent and which may use the tool of the instant invention is characterized by having a horizontal work table 20 with a pair of feed rollers 21. These rollers operate in the direction of the arrows to grasp a board stock B and feed it into the machine or towards the right as viewed in the drawing. Adjacent the feed rolls 21-21 is a vertically reciprocal beam 25 which carries the combined slotting and creasing tool of the instant invention generally designated 26. This tool is reciprocated between guideways 27, 28 and is provided broadly with slotting tools 29 and creaser members Fin-3t). The slotting tool portions 29 on being reciprocated downward as viewed in the drawing will enter a slot 31, and the tool will cooperate for cutting action with a pair of ledger plates 32. Spaced pairs of creasing rollers 3434 are provided on the machine which creasing rollers operate through an opening in the table 20 and form the crease lines 1616 in the blank 15. Preferably associated with the machine is a vertically reciprocable cutofl. knife assembly 35, the knife portion 35' of which is adapted to enter a slot 36 and cooperate with a ledger plate 37 to cut the box blank to the required length. Generally the operation of a machine briefly described above is as follows:

The stock B is manually fed to be engaged by the feed rollers 21 as the sheet B is intermittently fed forward in the proper timed relationship. When the blank first stops, the slotting and creasing tool 26 descends, cutting the first pair of slots 17-17 and forming the first pair of creases 18-18, and about the same time the forward edge of the blank B will be engaged by the longitudinal creasing rolls 34-34 to begin the formation of the crease lines 1616. The blank again moves forward to the next position, stops, and the slotting and creasing tool 26 again reciprocates downwardly to form the second pair of slots 1717, and this operation is repeated for the required number of slots. When the proper length ,of blank has been formed, forward motion is again arrested and the cutofi? knife 35 descends to complete the forming of the blank 15.

The tool to which this invention specifically relates is a combined slotting and creasing tool 26 which is shown more fully in FIGS. 3, 4 and 5, to which reference is now made. The tool comprises a shell casing formed from two plates 40, 41 (FIGS. 4, 5 and 6) which plates have formed therebetween a bottom opening recess 42 and which are abutted together at the top portion thereof as at 43 being fastened together at this location by a number of cap screws 44 (FIG. 6). Held between the two plates and 41 at suitable locations along the extent of the tool are a plurality of slotting members 29. Each slotting member may consist of a single piece of metal which has cutting teeth 46 at the bottom thereof and which have an inclined bottom edge to provide the necessary shearing action as the tool descends into its cooperating slot.

Received within the bottom opening recess on either side of the slotting tool 29 are a pair of creaser bars 30 and 30'. These creaser bars are preferably made up in sections of finite length, the total of which is longer than the maximum width of box blanks being handled, and each section comprising a pair of bars having a follower plate 52 at the top edge thereof together with a guide post 53.

The guide post 53 receives thereon a spring 54 which is held at its upper end by another guide post 55. The guide post 55 is received on a plate 56 which is secured areaoss in the upper portion of the slot 42 as by fastening the same onto the inwardly extending body portion of the

plates

40 and 41. The creaser bars 39 and 3% are guided for limited reciprocation between the

plates

40 and 41 by forming

recesses

58, 59 in the side walls of the plates t and 51 respectively. Stop plates at and 61 are constructed of suitable anti-friction self lubricating mate rial and extend inwardly into the recess 42, being held in position by means of cap screws 62. The stop plates are received within the

recesses

58 and 59 and will limit the reciprocation of the creaser bars as shown in FIGS. 4 and 5, the lower and upper edges as at 63 and 64 respectively of the creaser bar abutting the stop bar 61, for example.

The functional end or nose portions of the creaser bars 30 and 39' may be formed in a variety of shapes. As shown in FIGS. 4, 5 and 6 the creaser bars have a blunt end at 66 with an angular side wall at 67 that is extending upwardly at an angle of approximately 60. Some typical alternate shapes are, for example, shown in FIG. 9 wherein the combined

end surfaces

66 and 67 of the prior embodiment have been reoriented to provide a small blunt end adjacent the cutter bar as at "it? with a more gradual sloping wall 71 formed at an angle of approximately 30. In each of these varying embodiments a different type of emboss or crease is formed in the board under consideration. For example, in the form shown in FIGS. 4 to 7 the resulting embossing line formed will consist of two spaced walls extending on an angle so as to define effectively two folding zones as at 68 and 6?. When these two folding zones are utilized, they effectively bend only through an arc of to form the structure of FIG. 8 wherein the inner edge as at M of each portion of the embossed crease abuts. A slightly different result is secured with the form of creaser bar shown in FIG. 9. Here because of the great angle used for the surface 71, the emboss or crease formed will give a large cavity. Accordingly, when the wall board is folded in the area 72, '73, the

inclined walls

74, 75 will be spaced apart the distance shown for the thickness of wall board also shown. It will be apparent, however, that if a thicker board is used, the spacing will not be the same for the proportions will change.

From the above it will be seen that when the combined tools of FIGS. 3-6 are moved downwardly in the machine as described in FIG. 2, the ends 66, 66' of the creaser bars will first strike the upper surface of the board B. Further downward movement will extend the slotting tool 29 so as to cut a slot in the board B, and during this operation the only pressure being exerted by the creaser bars 30 and 3t) is by the urgence of the spring 54 which is being compressed. Further downward movement of the com plete assembly will cause an abutment of the surface 63 against the guide block 61, for example, and positively force the entire end of the creaser bars into embossing relationship with the board as shown in FIGS. 5, 7 and 9. The reverse travel of the tool upwardly will be in reverse action. It will be seen that since the creascr bar ends of the tool of FIGS. 36 will come in contact with the board under first the urgence of pressure exerted by a spring, there is avoided any sudden or abrupt crushing action which would be encountered when a creaser bar is forced under pressure of a hydraulic actuating ram solidly against objects such as a board. There is, however, a sudden impact of the slotting tool 29 with the board which will provide a clean shearing action that is enhanced by providing the teeth on an angle relative to the surface of the board so that the teeth at the lower end 45 of the tool 29 first engage the sheet board and provide a clean shearing action as successive teeth come in contact.

Referring now to FIG. 11 of the drawing, there is shown a basic form of slotting tool and creaser bar assembly in accordance with the invention. The knife member 35 is, as in the previously described embodiments, held rigidly in position between the two side plates 40' and 41' by cap screws such as 44. Along a narrowed upper portion 36 of the knife, there is received a pair of creaser bars 87 and 88 which terminate in a pair of angled side walls 89, 90 respectively, the creascr bars being held in vertical position relative to the knife by means not shown. In this fashion as the complete assembly descends and completes a stroke, the creaser members particularly the side walls thereof 89, 9% will emboss the portions of the slot 17 on either side thereof continuing between the slots with a complete pair of embossed areas formed by the

end walls

91 and 92 on lines such as 18-18 in FIG. 1.

The structure of FIG. 11 is particularly adapted to homogeneous materials such as solid fibre board, chip board, fibre box board, folding box board, double face kraft board, and miscellaneous like, and silimar appellations such as sheet and board made from wood fibre, plastics and other organic and inorganic compounds. Further, this structure is particularly adapted to such boards when coated for surface-finish and/or employed to provide liquidand vapor-tight barriers. Specifically, in such applications, the width of the notch blade 85 is determined as a proportion of the thickness of the material, and the depth of the creases such as at 94 also is proportioned to the same reference. Uniquely, in comparison to the type of subsequent folding of the corner as shown in FIGS. 7, 8, 9 and 10 with the inner material of the box on the top and the fold made upward, the creasings may be made on the outer surface 95 of the material, and the folding subsequently made downward as shown in broken line in FIG. 12.

l claim:

1. A slotting and creasing tool for use in a box blank forming machine comprising a casing having a pair of side walls, a top wall and an open bottom wall, slotting members fastened in said casing at certain locations and in a tanner to project cutting portions below the bottom wall of the casing, a pair of creaser bars transversely spaced within said casing, said bars received for reciprocation and normally spring biased below said bottom wall, the lower edges of said bars having nose portions with blunt ends.

2. A slotting and creasing tool for use in a box blank forming machine comprising a casing have opposite interior walls, a pair of spaced creaser bars having portions located exteriorly of said casing and other portions contiguous with said walls, said creaser bars having nose por tions extending below the lower edge of the casing, a slot ting member fastened in said casing and having a cutting portion projecting below said casing, said slotting memher being received between portions of said spaced creaser bars, said creaser bars being arranged to slide in said casing perpendicular to the lower edge thereof, resilient biasing means urging said creaser bars outwardly of said casing and stop means associated with said casing engage able with said creaser bars whereby movement of said bars inwardly of said casing is arrested.

References Cited in the file of this patent UNITED STATES PATENTS 2,485,020 Staude Oct. 18, 1949 2,814,344 Oberem Nov. 26, 1957 2,851,933 Bradford et a1 Sept. 16, 1958 3,060,816 Martin Oct. 30, 1962 FOREIGN PATENTS 14,743 Great Britain July 18, 1905 209,529 Germany May 4, 1909 225,675 Great Britain r Dec, 11, 1924

Claims

2. A SLOTTING AND CREASING TOOL FOR USE IN A BOX BLANK FORMING MACHINE COMPRISING A CASING HAVE OPPOSITE INTERIOR WALLS, A PAIR OF SPACED CREASER BARS HAVING PORTIONS LOCATED EXTERIORLY OF SAID CASING AND OTHER PORTIONS CONTIGUOUS WITH SAID WALLS, SAID CREASER BARS HAVING NOSE PORTIONS EXTENDING BELOW THE LOWER EDGE OF THE CASING, A SLOTTING MEMBER FASTENED IN SAID CASING AND HAVING A CUTTING PORTION PROJECTING BELOW SAID CASING, SAID SLOTTING MEMBER BEING RECEIVED BETWEEN PORTIONS OF SAID SPACED CREASER