Патент USA US2509875код для вставки
May 30, 1950 o. E. LARSSON 2,509,870 CARTON STAPLING MACHINE Filed July 22, 1949 14 I NVENTOR. a?’ 513% ZM/M/n; ATTOR N E Y Patented May 30, 1950 2,509,870 UNITED STATES PATENT OFFICE 2,509,870 CARTON STAPLING MACHINE Olof Einar Larsson, Orebro, Sweden Application July 22, 1949, Serial No. 106,175 In Sweden August 16, 1948 2 Claims. 1 This invention relates to carton stapling ma chines of the type comprising a frame, a stitch ing apparatus mounted thereon, and adjustable beams supporting two feed shafts having pulleys for conveyor belts for feeding carton blanks through the stitching apparatus. (G1. 1—-11) 2 cal faces for guiding the edges of the carton blank. The shaft l4 of the stitching apparatus 22 is driven intermittently by a drive pulley I5 suit ably connected with a source of power, not shown. The drive pulley rotates at a constant speed and drives continuously the feed shafts | and 2 by The object of the invention is to provide a ma chine of the type indicated in which the opera means of a belt or chain transmission 30 and a tion of the stitching apparatus is started and speed changing gear diagrammatically indicated stopped by the movement of the carton blanks 10 at 26. Every time a series of staples is to be and in which the positions of the ?rst and the driven into the carton the drive pulley is engaged last staple in a series of staples and the spaces with the shaft I4 by means of an electrically actu between consecutive staples can be conveniently ated iron core 2|, the electric arrangement and adjusted. operation thereof being as follows. I attain this object and other objects by mecha Between the belts 8 there is provided a switch nism illustrated in the annexed drawing, in | 6, Fig. 3, connected to a source of electric cur which— rent 3|. When this switch is struck by the front Fig. 1 shows an elevation of a carton stapling or leading edge 9a of a carton blank 9 fed in the machine viewed in the direction of movement of direction of the arrow 32, it is closed and will be the carton blanks; Fig. 2 is a section taken along 20 kept closed for as long as the carton blank is the line 2-2, Fig. 1; Fig. 3 is a circuit diagram of sliding over it. After a short moment, the front an electric initiating device; Fig. 4 illustrates a edge of the carton blank strikes a resilient bucket frictional clutch for the stitching apparatus; Fig. wheel I‘! which momentarily closes a switch I8 5 shows diagrammatically displaceable contact members for the initiating device; and Fig. 6 is an end elevation of a carton blank in folded position, ready to receive staples. Referring to the drawing, the stitching appara tus 22 is arranged at the central portion of the machine supported by a frame or support 28, the power input shaft M of the stitching apparatus extending laterally of the machine. The stitch ing apparatus is shown diagrammatically only and may be of any suitable construction. In par allel relation to shaft l4, two feed shafts | and 2 are provided which are supported by beams 4 dis by means of a vane wheel I9 mounted on the same shaft as the bucket Wheel. Thereby an elec tric circuit is closed, through the members 3|, 33, I6, 34, I8, 35, solenoid 20, and conductor 35. As a result, the solenoid 20 attracts the iron core 2| which, in the manner described hereinbelow, engages the drive pulley l5 with the shaft i4 so as to start the stitching apparatus. In the mean while, the switch IB has been opened by means of a spring 23 and is ready to be closed again when the next carton blank arrives. However, the solenoid 20 is still traversed by the current, in spite of the interruption at l8, because of the fact that the iron core 2|, when it starts the stitching apparatus, simultaneously closes a shafts l and 2 have mounted thereon pulleys 5 switch 24. The current then flows through the splined on the shafts so as to be displaceable thereon together with the beams but not rota 40 members 3|, 33, Hi, 34, 24, 31, 20, 36. As a result, the stitching apparatus will be operated until the table relative to the shafts. Feed or conveyor carton blank has passed the switch I6. At this belts 8 mounted on the pulleys 5 support the car moment, a spring 25 opens the circuit at I6, and ton blank 9 which is kept in engagement with the the solenoid is deenergized. A spring 28 then conveyor belts 8 by means of pressure rollers I!) back the iron core which disengages the which are slightly conical having their smaller 45 pushes stitching apparatus from the drive pulley I5. end faces directed toward the blank portions to On the shaft I4 of the stitching apparatus there be united by the staple seam. The rollers l0 are is loosely mounted a disc 38, Fig. 4. A helical mounted on pins I I supported by beams 3. In the spring 39 is provided in an annular space 40 be beams 3 there are also mounted vertical pins for 50 tween the outer circumference of the disc 38 .and bevel gears l2 cooperating with bevel gears l3 an inner cylindrical face 45 of the drive pulley slidably mounted on the shafts | and 2 but not I5. One end 4| of the spring is secured to the rotatable relative to the shafts. On the vertical shaft I4 and the other end 42 is secured to the pins or shafts for the bevel gears l2 there are disc 38. The disc has a radially extending shoul mounted pulleys Ii for guide belts 1 having verti 65 der 43 which in the position illustrated is engaged placeably carried by stationary bars 29. The 2,509,870 3 by the upper end of a rod lid connected with the iron core 2 l . With the parts in the position shown in Figs. 3 and 4, the shaft M of the stitching apparatus is disengaged from the drive pulley l5. When the solenoid it attracts the iron core, the rod lili- is moved downward out of engagement with the shoulder of the disc 38 and the disc is released to the action of the spring 39. The spring 39, which inrthe position shown in Fig. 4 is in a com pressed state, will then expand radially and en gage the inner face ‘it of the drive pulley. The frictional contact of the spring 39 with the ro tating drive pulley l5 causes the rotation of the spring and the shaft Hi in the direction of the arrow (iii. When the rod is again moved upward into the position illustrated, it will arrest the ro tation of the disc 38, the spring 39 will compress and relieve its frictional contact with the driving pulley i5, and the connection between the drive pulley and the shaft M will be interrupted. By means of the speed changing gear 26, the ratio between the speeds of the feed shafts i, 2 and the shaft M can be varied. If the carton blank is fed at a low speed, the stitching appa~ ratus has time to apply a great number of staples while the carton blank passes the same, and vice versa. The place where the staples are driven into 4 shaft, a ?rst switch located in the carton path in advance of the working position of the stitch ing apparatus, as viewed in the direction of move ment of the carton, said switch being constructed and arranged to be closed by contact with the leading edge of a carton and to be kept closed ior as long as the carton is sliding thereon and to be opened when the trailing edge of the carton comes out of contact therewith, a second switch located in the carton path behind the working position of the stitching apparatus, said second switch being constructed and arranged to be closed momentarily by contact with the leading edge of said carton, a source of electric curre t connected to said switches, a solenoid connecte ’ to said circuit-breakers to be energized upon clos ing of the switches and to be deenergized upo opening of said ?rst switch, an iron core adapted to be attracted by said solenoid, a third switch operatively connected to said iron core to be closed upon attraction thereof whereby to maintain said solenoid in an energized state irrespective of the opening of said second switch, and means con nected with said iron core engaging said clutch when the solenoid is energized and reieas~ ing said clutch when the solenoid is deenergized. 2. In a carton stapling machine, a stitching apparatus having a power input shaft, carton feeding means including feed shafts, driving the work is indicated at 27. The distances from 30 means for rotating said feed shafts, a clutch for the switches i5 and lg to the position 2? are ad connecting the driving means with said input justable. To this end, the switches are mounted shaft, a ?rst switch located in the carton path in in suitable boxes or carriers iii and iii, respec advance of the working position of the stitching tively, which are slidably arranged on the frame apparatus, as viewed in the direction of move 23. The distance between the points 2'? and i8 ment of the'carton, said switch being displace de?nes the distance between the front edge of the able in said direction and constructed and ar carton blank and the ?rst staple applied, whereas ranged to be closed by contact with the. leading the distance between the points 2? and it de?nes edge of a carton and to be closed for as long the distance between the last staple applied and as the carton is sliding thereon and to be opened the rear edge of the carton blank. It is thus 40 when the trailing edge of the carton comes out of possible, by changing the positions of the switches contact therewith, a second switch located in the it and E8, to predetermine the distances of the carton path behind the working position of the staples applied from the front or leading edge stitching apparatus, said second switch being and the rear or trailing edge of the carton blank. displaceable in said direction and constructed Due to the fact that the switch it is closed mo and arranged to be closed momentarily by con mentarily only, carton blanks can be fed through tact with the leading edge of said carton, a source the machine with very small distances between of electric current connected to said switches, the rear or trailing edge of a blank and the front a solenoid connected to said circuit-breakers to or leading edge of the next blank. This would be energized upon closing of the switches: and to not be possible if the switch is were kept closed be deenergized upon opening or‘ said ?rst switch, until the blank has passed it. In that case, a an iron core adapted to be attracted by said sole new blank could be fed only after the preceding noid, a third switch cperatively connected to said blank has left the switch it, since otherwise the iron core to be closed upon attraction thereof stitching apparatus would be disengaged only whereby to maintain said solenoid in an energized during the period between the disengagement of state irrespective of the opening of said second the switch it‘ from a blank to the engagement switch, and means connected with said iron core thereof with the next blank. and engaging said clutch when the solenoid is What I claim is: energized and releasing said clutch when the 1. In a carton stapling machine, a stitching solenoid is deenergized. apparatus having a power input shaft, carton l OLOF EINAR LARSSON. ,5 means including feed shafts, driving No references cited. means for rotating said iced shafts, a clutch for connecting the driving means with said input Certi?cate of Correction Patent No. 2,509,870 May 30, 1950 OLOF EINAR LARSSON It is hereby certi?ed that errors appear in the printed speci?cation of the above numbered patent requiring correction as follows: Column 4, lines 16 and 48, for “circuit-breakers” read switches; and that the said Letters Patent should be read With these corrections therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 5th day of September, A. D. 1950. [SEAL] THOMAS F. MURPHY, - Assistant Oommz'ssz'oner of Patents.