Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/01—Means for holding or positioning work
  • B26D7/02—Means for holding or positioning work with clamping means
  • B26D7/025—Means for holding or positioning work with clamping means acting upon planar surfaces
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41H—APPLIANCES OR METHODS FOR MAKING CLOTHES, e.g. FOR DRESS-MAKING OR FOR TAILORING, NOT OTHERWISE PROVIDED FOR
  • A41H43/00—Other methods, machines or appliances
  • A41H43/02—Handling garment parts or blanks, e.g. feeding, piling, separating or reversing
  • A41H43/0271—Registering
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/20—Cutting beds

Definitions

• Industrial manufacturing processes use automated cutting of fabric coupons to make the pieces constituting a suit, a tailor, an overcoat, etc.
• This cut is made on flat tables, rectangular in shape and arranged horizontally.
• the size of the tables makes it possible to spread out a fabric coupon.
• the surface of the table must have three qualities: a) be slippery so that it is possible to spread the fabric very uniformly without any folds with a precision of position tight compared to benchmarks related to the table, b) not be slippery so that the fabric cannot move either during a movement of the table or during cutting, c) be permeable to gas to allow the suction of the fumes given off by laser cutting, d) present the minimum surface area free to limit the effects of the laser on the table surface.
• a separator belt is unwound above the conveyor belt at a location upstream from the loading station, the speed of advance of the separator belt being lower (or at most equal) than that of the conveyor belt.
• the present invention provides solutions to these problems - friction,
• a first characteristic of the invention is to move the sliding sheet (playing a role analogous to the separator mat of the aforementioned request) by pulling it which allows it to be stretched.
• a variant even avoids any contact between the slippery sheet and the honeycomb which eliminates wear by friction.
• Another characteristic of the process is to pinch the fabric not only on a line perpendicular to the movements of the carpet but also on the two edges of the carpet where the suppression of folds and undulations of the fabric.
• Figure 1 schematically shows a side view of the cutting table.
• the X axis will always be along the length of the table, the Y axis along the width and the Z axis is vertical.
• Figure 3 shows the end of the sliding sheet (3), which will coincide with the end A of the table (along X), we note the presence of notches (31).
• Figure 4 shows in side view the table (1) ready for cutting, the fabric coupon (4) placed on the upper surface (2) of the table and the sliding sheet (3) removed (along X) from the surface of the table.
• Figure 5 shows a top view of the table covered with the sliding sheet and the coupon (4).
• the notches (31) of the sliding sheet are along the width FG of the cutting table.
• a presser (50) presses the fabric vertically on the upper surface of the table without touching the sliding sheet. The part of each presser in contact with the fabric is included in the notch.
• pressers (51) and (52) (distributed over the entire length) apply the fabric coupon and the sheet sliding on the upper surface of the cutting table.
• the total pressing force of the pressers (50) must be sufficient to block the fabric.
• the total force of the pressers (51) and (52) must allow the sliding sheet to slide without the fabric moving.
• the pressers (50) will be called: radial and the pressers (51) and (52): lateral.
• the operating mode is as follows: a) placement on the cutting table of a sliding sheet by pulling it along the X axis until it is flush with the FG side of the table, b) placement of the fabric that the '' you can move easily on the
• ⁇ _ slippery sheet One can in particular put selected points of the coupon (intersections of stripes for example) on pre-established marks, c) actuation of the pressers (50) which press the fabric on the table through notches (31) of the sliding sheet , d) actuation of the pressers (51) and (52) which apply the fabric lightly to the sliding sheet, e) pulling the sliding sheet parallel to X from F to E and from G to H without the fabric moving since it is held firmly by the pressers (50), f) total removal of the sliding sheet so that the fabric rests completely on the non-sliding upper surface of the cutting table.
• the adjustment of the pressers makes it possible to precisely maintain the position of the fabric relative to the preset marks. This conservation makes it possible to automatically cut the fabric according to a program without fumbling.
• the upper surface of the table is sufficiently non-slippery so that all the pressers can be erased and the cutting carried out without any displacement of the fabric.
• a honeycomb sheet of approximately 15 to 20 mm thick is produced with this material.
• a thin sheet material sufficiently rigid to spread flat without any folds and sufficiently flexible to be able to be wound on a drum.
• Figure 7 shows in perspective the cutting table (1) on which is placed the sliding sheet (3).
• Clamps (70, 71) clamp two corners of the sheet (3) and traction is exerted on each clamp by a chain driven by a pinion. We therefore see on one side the chain (72) and the sprocket (74) and on the other side of the chain (73) and the sprocket (75).
• a single motor shaft (76) drives in synchronism the two identical pinions (74, 75) carrying out an equal displacement at equal speed for the two clamps (70, 71). This allows the sheet (3) to be driven parallel to the X axis without lateral offset along Y.
• the sheet (3) is placed on a roller (77) whose shaft (78) is braked (by a counterweight or by a spring for example, creating a restoring torque therefore a restoring pulling force on the sheet).
• the sheet (3) is tensioned to make it flat.
• Placement of the fabric For example, manual placement so as to make a certain number of singular points of the fabric coincide (intersection of stripes for example) with a luminous mark projected vertically on the fabric.
• Radial pressers can be constituted by pneumatic cylinders acting vertically, positioned regularly on the FG side of the cutting table. They are carried by a transverse beam linked to the sides of the frame of the cutting table.
• Figure 8 which is a vertical section of the cutting table, we see the frame (81) and the table (1).
• a beam (82) carries the jacks (83) with their rod (84).
• a tubing (85) supplies the actuating fluid to the jack.
• a rotation of the shaft brings the cams (91) into contact with the fabric (not shown) placed on the table (1).
• FIGS. 10 to 13 Cutting table with vertical displacement A variant has been shown in FIGS. 10 to 13 interesting method, following a vertical section passing through the X axis (of Figure 1).
• the upper face of the cutting table having a honeycomb structure has a highly abrasive surface since it appears as a succession of sharp edges.
• the abrasive effect is particularly strong on the part of the sliding sheet having cutouts as taught in the aforementioned application. This abrasive effect is much more marked in the phase of placing the sliding sheet, on the one hand because of the speed, on the other hand because of the orientation of the cuts.
• a cutting table with vertical displacement is used at least for the honeycomb part.
• the table can be either in the low position during the positioning of the sliding sheet, or in the high position for the positioning of the fabric and the removal of the sliding sheet.
• Figure 10 shows the sliding sheet unrolling while the table is in the low position.
• Figure 11 shows the sliding sheet completely unrolled so fixed while the table is in the low position.
• Figure 12 shows the sliding sheet while the table is in the high position.
• Figure 13 is a variant of the device of Figures 10, 11, 12 for controlling the movement of the table.
• the actual cutting table consists of a metal frame and a honeycomb parallelepiped structure, (item 81).
• a frame (82) guides the movements of Table.
• An articulated chisel (83) resting on a horizontal crosspiece (84) makes it possible to impose a vertical displacement on the table (81).
• the chisel is in the folded position (item 83) while in Figure 12, it is in the unfolded position (item 85).
• the deformations of the chisel are controlled by known means such as a screw.
• FIG. 13 shows a variant for the vertical displacement of the table without showing the sliding sheet and the rollers.
• jacks such as (91) and (92).
• the rods (93) and (95) bear under the table (81).
• the pipes (97) and (98), joined to the pipe (96), allow the two cylinders to be supplied with high pressure liquid in synchronism and thus to move the table.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26225104

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (4)

Family Cites Families (2)

• 1987
  • 1987-03-17 FR FR8703670A patent/FR2612504B2/fr not_active Expired
  • 1987-03-19 WO PCT/FR1987/000083 patent/WO1987005472A1/fr not_active Ceased
  • 1987-03-20 CS CS190487A patent/CS272773B2/cs unknown
  • 1987-11-20 SU SU874203743A patent/SU1752183A3/ru active

Patent Citations (4)

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