US2452773A

US2452773A - Cutting table

Info

Publication number: US2452773A
Application number: US673865A
Authority: US
Inventors: Levin David
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-06-01
Filing date: 1946-06-01
Publication date: 1948-11-02
Anticipated expiration: 1965-11-02

Description

Nov. 2, 1948. D. LEVIN 2,452,713

CUTTING TABLE Filed June 1, 1946' s Shbets-Sheot 1 AY'ZErne /s D. LEVIN CUTTING TABLE Nov. 2, 1948.

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Filed June 1, 1946 Cam supporting brackets 24 extend downwardly from the carriage frames 2I said brackets carrying a pair of

latch cams

25, 25, and extending around the side frame member 2 and up between the members I and 2 to carry the support-actuating

cams

26, 26. The cams 25 are in the form of curved grooves, low at the ends and high in the middle, and are so disposed as to engage the cam followers I9 to raise and lower the latch members I8 as the carriage is moved. The cams 26 are in the form of approximately helical grooves extending around an arc of 90, and are so disposed as to engage the cam followers It to rotate the supports 7 between their upper and lower positions (Figs. 3 and 5) as the carriage is moved. The earns and 26 must naturally be placed so that the latch members I8 are held out of engagement with the notches I3 and I 4 while the supports are being rotated or rocked; that is, the cams 25 must release the latch before the cams 26 can cause rotation in either direc tion, as by disposing the active helix of the cams 26 opposite the high middle part of the cams 25.

The tracks 29 have slots or grooves 2? near their upper edges and shoulders 28 spaced somewhat below the slots or grooves. A cutting tool mounting 29, provided with wheels or rollers 36, is arranged to be movable between the tracks and supported by the shoulders 28, this mounting including a circular turn-table 3| to which a cutting tool (not shown) is secured so as to be freely rotatable in all directions. The tool may be of the type exemplified by Ogden Patent No. 2,343,202, issued February 29, 1944, or may preferably be of the type in which cutting blades are mounted on the links of an endless chain, as in C. E. Clark Patent No. 1,309,317, issued July 8, 1919.

In either case the usual base of the tool is eliminated and the tool is secured directly to the turntable 3 I. As shown in Figs. 1, 2, 7 and 8, the turntable is slotted as at 32 so that the cutting blades can pass below the table surface.

The mounting 29 forms part of an endless belt made up of the blocks 33, hinged together at 34, and provided with pins or rollers 35 which project into the grooves 21, as shown in Fig. 9. This belt is supported at its ends by the sprocket wheels 36'journaled on brackets 31 which are mounted on the carriage frames ZI the sprockets engaging with the rollers 35 of the blocks at the ends of the belt. The carriage is also provided with auxiliary supporting fingers 38, which may be mounted at the top edge of the tracks 29, and which project lengthwise of the table at intervals across the table corresponding to the .recesses II) in the hinged supports I. These fingers extend from the carriage a distance at least somewhat greater than the interval between adjacent supports, and the outer ends of the fingers are disposed slightly below the level of the top surface of the supports.

In operation, a lay of cloth to be cut, comprising any suitable number of plies piled up within the thickness limit of the cutting machine, is placed on the table; the supporting surface of the table being made up of the parts 9 of the individual supports in their upper positions, supplemented by the fingers 38 and the endless belt formed by the blocks 33. The cutting machine, mounted on its turntable 3I, is then moved, by hand or otherwise, in any desired direction through the lay, traveling transversely of the table on the tracks 20 of the carriage and traveling lengthwise of the table with corresponding lengthwise movement of the carriage. Thecutter may be moved in a straight, curved or angular line as may be required, for instance, by a cutting pattern for the particular lay being out.

In the case of a movement having a transverse component it will be evident that a continuous lay-supporting surface is formed at all times by the blocks 33, mounting 29 and turntable 3|, regardless of how the latter may be moved.

In the case of motion having a lengthwise component, the lay-supporting surfaces of the carriage, including the fingers 38, automatically substitute themselves for the parts 9 of the hinged supports as the carriage is moved. As the carriage advances its front pair of

cams

25 and 26 engage a correspondin pair of followers I9 and I6,-respectively; cam 25 lifts the latch member I8 on which follower I9 is mounted out of engagement with notch I3, cam 26 then rotates through a turn the support I on which the follower I6 is mounted, and upon completion of this rotation the cam 25 lowers the latch I8 into engagement with the notch I4 to hold the support in its depressed position (Fig. 5). This procedure is repeated as the carriage approaches successive supports, at least two such supports on each side of the table being depressed at any position of the carriage, as shown in Figs. 1 and 2. As the carriage starts to pass beyond one of the supports depressed beneath it, the rear pair of cams act in a reverse manner to raise the support; the rear cam 25 releasing the latch while the corresponding rear cam 26 swings the support to its upper position where it is again latched.

The supports on the two sides of the table are staggered so that there can be no interference when they are moving and so that resistance to motion of the carriage (resulting from friction in the cams, inertia of the supports, etc.) will be distributed as evenly as possible.

In Figs. 3, 4 and 5 the supports are shown as being balanced by counter-weights I5 and Fig. 7 shows the brackets 24 shaped to allow room for these counterweights. The latter may, however, be replaced by suitable springs, for instance the torsional springs 39 shown in Fig. 6, in which case the bracket 24 can be made somewhat more compact, if desired. In the further modification shown in Fig. '11 the supports 7 are pivoted in brackets 49 mounted on the side frame member I, the member 2 being eliminated and the bracket 24 being replaced by a short bracket II. In this case it is assumed also that springs (not shown) are used instead of counter-weights.

The table can be made of any desired length, with more than. one carriage unit if necessary, and of a width sufficient for any normal requirements. The supports may not have to be depressed through a full 90 so long as they move far enough to clear the lower run of the endless belt on the carriage. If the supports are so balanced as to stay depressed by gravity, the notches I4 may be omitted together with the inner half of each cam 25. The horizontal spaces between adjacent supports can be made narrower, resulting in a more nearly continuous supporting surface, by widening the parts 9 or by locating the supports closer together, or both, in cases where this may seem desirable.

It will be understood that various other modifications can be made in the form, construction and arrangement of the several parts without departing from the spirit and scope of the invention;.and hence I do not intend to be limited to details herein shown or described except as they 5 may be included in the claims or required by disclosures of the prior art.

What I claim is:

1. A cutting table comprising, a frame, a pmrality of supports pivotally mounted in the frame, releasable means for holding the supports in work-supporting position, a carriage extending across the frame and movable longitudinally thereof, portions of the supports and the carriage top lying in a single plane to constitute a worksupporting table surface, a cutting tool mounting on the carriage, and means on the carriage moving the supports out of the path of said carriage adjacent the carriage on the side toward which it is moved and returning the supports to said plane adjacent the carriage on the opposite side thereof.

2. A cutting table according to claim 1 which includes means on the carriage actuating the support-holding means.

3. A cutting table according to claim 2 in which the means actuating the support-holding means is a cam and in which the support-moving means is a cam.

4. A cutting table according to claim 1 in which the carriage top is horizontally movable with repect to the carriage.

5. Acutting table according to claim 1 in which the carriage top is horizontally movable with respect to the carriage, and in. which the cutting tool mounting forms part of said movable top.

6. In a cutting table of the character described having a supporting surface for the lay of material to be cut, a movable carriage including tracks extending across the table, an endless belt having its upper run guided by said tracks in the plane of the supporting surface, and a cutting tool mounting constituting part of said endless belt.

7. A table according to claim 6 in which the cutting tool mounting comprises a turn-table having its upper surface in the plane of the maserial-supporting surface and being provided with an opening in which a cutting tool may pass below the level of said plane.

8. In a cutting table of the character described having a supporting surface for the lay of material to be cut, a plurality of piv0tallymounted supports each comprising a horizontal part, a vertical arm, an arcuate part disposed around the pivot point and means for counterbalancing the support.

9. A table according to claim 8 in which the arcuate part is provided with at least one notch adapted to engage a holding means.

10. A table according to claim 8 in which the horizontal part is transversely recessed.

11. A cutting table of the character described in which the supporting surface for the lay of material to be cut comprises, the horizontal parts of a plurality of pivotally mounted supports, the upper run of an. endless belt extending across the table, and a cutting tool mounting constituting part of said endless belt, said supporting surface elements having their upper surfaces substantially in the same plane.

12. A cutting table according to claim 11 in which the said horizontal parts of the supports are transversely recessed.

13. A cutting table according to claim 11 in which the said horizontal parts of the supports are transversely recessed, and which includes auxiliary supporting fingers extending from points adjacent the endless belt into the recesses of adjacent supports.

DAVID LEVIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Smith Aug. 13, 1940 Number