US1743666A - Machine for wrapping loaves of bread - Google Patents

Description

Jan. 14, 1930. P. GANGLER 1,743,565

MACHINE FOR WRAPPING LOAVES OF BREAD Filed June 16, 1927 4 Sheets-Sheet 1 PAUL GANG LEK INV ENTOR;

Jan. 14, 1930. P. GANGLER MACHINE FOR WRAPPING LQAVES OF BREAD 4 Sheets-Sheet 2 Filed June 16 1927 mvawrqm Attahwy.

SW NMY Jan. 14, 1930. P. GANGLER IACHINB FOR WRAPPING LOAVES OF BREAD 4 Sheets-Sheet 3 Filed June 16. 1927 P L GA GLERL #{VENTOFR Jan. 14, 1930. P. GANGLER mourns FOR- WRAPPING LOAVES 0F BREAD Filed June 16, 1927 4 Sheets-Sheet Paul Ganglar INVENTOIC Patented Jan. 14, 1 930 UNITED STATES PATENT OFFICE,

PA'UIi GANGiLER, 0F ESSLIN'GEN, GERMANY, ASSIGNOR TO THE FIRM FR. HESSER, MASCHINENFAIBRIK-AKTIENGESELLSCHAFT, 0F STUTTGART-CANNSTATT, GERMANY MACHINE FOR WRAPPING LOAVES OF BREAD Application filed June 16, 1927, serial No. 199.252. and in Germany April 19, 1926.

My invention relates to machines for wrapping loaves of bread or articles of similar irregular shape in wrapping sheets of ordinary or waxed paper, and more particularly to wrapping machines of that type in which for the purpose of closing the front flaps of the wrapper these flaps are twisted together by rotating tongs or grippers.

The object of my invention is to provide a reliably operating wrapping machine, which is simple in construction and operation and produces mentor and clearer packages than are obtained by known machines.

An embodiment of my invention is illustrated in the accompanyingdrawings, the machine shown being intended for wrapping up loaves of bread.

In the drawings is:

Fig. 1, a diagrammatic plan of the general arrangement of the machine,

Fig. 2, a side-elevation of the essential parts of the machine,

Fig. 3, a front-elevation viewed from the left of a twisting device according to Fig. 2 for twisting the ends of the wrapper,

Fig. 4, a planet :1. pair of twisting tongs together with a wrapper twisted at the ends,

Fig. 5 is an enlarged longitudinal sectional view through the bearings and through the device for shifting of the twisting device shown in the left side of Fig. 3. Fig. 6 is a front view from the left side of Fig. 5., Fig. 7 is a cross section taken on lines AB of Fig. 5, looking in the direction of the arrows. Fig. 8 is a view of the frame which supports the bearing of the twisting device.

Like parts are indicated by like letters and numerals of reference in all the figures of the drawings.

Referring to the drawings, it will be observed that the loavesof bread B are introduced into the machine, in a well-known manner, upon a lower feed track by means of two adjacent intermittently propelled conveyor chains 52 provided with driving members 51 engaging the loaves at the back until they reach a spring-controlled stop 53 pivoted at 56 to the machine frame and an elevating plunger or platform 1. The intermittent drive of the conveyor chain 52 is effected by any known and therefore not illustrated suitable 'drivii'ig device from the main driving shaft A journalcd in suitable bearings of the machine framing. Said shaft A may be continuously rotated by means of the pulley 300, intermediate pulleys 305, 306 and belts 308, 308), Fig. 1, from the pulley 307 of an electric motor M. The elevating plunger 1 is adapted to be reciprocated vertically so that it raises the leaf from the position I-into the position-II, Fig. 2, opposite to an upper feeding track 103.

The raising and lowering of the elevating plunger lisefi'ectcd inthe manner well-known in conjunction with suchmachines from the main driving shaft A by means of eccentric and levers. Above the leaf located in the position I, a Wrapper to be folded around the loaf is placed upon suitably bent Wires 54 and 55 which are pivoted at 56 and 57 and maintained in the horizontal position illustrated in Fig. 2 of the drawings by suitable springs not shown.

I may use cut-to-size Wrappers for the loaves, in which case the wrappers or sheets are stacked in a pile and individual wrappers fed to the wires 54 and 55 by suitable means, none of this mechanism being illustrated in the drawings as it is well-known in the art, or I may use a paper web P drawn continuously from a reel (not shown) by means of a pair of rollers, also not shown. From this pair of rollers the .Web of paper passes on to a second pair of rollers indicated at 39, 40 in Fig. 2 of the drawings, and of which the roller 39 is continuously rotated by means of a sprocket wheel 62 and chain 63 from a suitable sprocket wheel of the main driving shaft A, and the roller 40 is rotated by frictional contact with the roller 39. 7

Every time the front end of the paper web P has been fed forward by the rollers 35), 40 past the hereinafter described severing device and on to the wires 54 and 55 by a length which corresponds with the required length of the wrapping sheet, the Web is clamped in position by a holding-down rail 42 upon the support 200 in known manner and cut oil by the cutting or severing device. This consists, in. a well known manner, ina fixed knife 41 A and an upand down reciprocatin knife 41',

vide'd at two levers 41; an upwardly extending finger like Frolon ation 41 at the one end of the kni e 41 eing connected to a spring 41', which keeps it in permanent touch with the stationary knife 41. The levers 41 are fixed to a shaft 41, which rests in bearings in the machine frame. The reciprocating vertical movements of the knife 41 is afiected in the well known manner by a suitable eccentric disposed on the driving shaft A and the arm 41', which is fixed on the shaft 41 and connectin rod 41". The holdin rail 42 does not re ease the front end of the paper web, until the elevating lunger 1 has com leted an ascent and a escent. The hol ing-down rail 42 is mounted upon an arm 66 pivoted at which in known manner is operated and controlled by means of the connecting rod 67 and an eccentric from the main driving shaft A, in a well-known manner.

When the loaf is raised b the elevating plun er 1 from the position T into the position I, it turns the two wrapper supporting wires 54, 55 upwards and sideways and carries the severed sheet of paper uBwards, whereu on the sheet is folded in -sha e about t e bread B by folding plates 4 an 6 located at theupper end and sideways to the vertical track.

The folding plate 6 is also designed as a reci rocating folding slide. Reciprocatin motionis imparted to the plate 6 by means 0 a rack 76, the pinions 78 and 79 mounted upon the shaft. 77 and the toothed quadrant 80 mounted at the u per end of a bell-crank lever 82 which is pivoted at 81 and the other arm of which is engaged by the rod 83 which is moved and controlled in a well known manner not illustrated, but comprising intermediate levers from a suitable eccentric mounted on the drivin shaft A.

Above the fol ing slide 6, there is located a second slide 3 adapted to be operated by .means of arack . spur wheels 201 and 71 and a, toothed quad rant 72 mounted at the upper end of a lever 74 pivoted at 73, the other arm of which is adapted to be oscillated bymeans of the rod and connecting levers from an eccentric of the shaft A in wellknown manner, for the purpose of oscillating the quadrant 74.

Opposite the slides 6 and 3 and adjoining the olding plate 4 extends the upper feed track 103 upon which the bread is carried forward towards the left.

When the bread with the paper wrapping folded over is raised into the upper position II in the manner described, the slide 3 is b its described driving device moved towar s the left by-such a distance that the bread with its left-hand side, which is in Fig. Qindicated ping projecting downwards against the un-.-

derside of the loaf Ii and supports the latter. Now the stop 5 is raised by a mechanism g which will be hereafter described, and the bread is moved towards the left by a further advance of the slide 3 intothe position III in which the loaf encounters an angular stop 9 which like the angle 5 and by means of the same operating mechanism is able to perform a vertical reciprocating movement. The described step-wise movement of the slide 3 is effected in the well known manner by the circumferential shape of the above mentioned drivin eccentric which by means of the describe connecting links and gear, controls and operates the slide 3.

The angles 5 and 9 are mounted upon a common rail 7 which is raised and lowered by a parallel motion. This parallel motion is composed by two double-armed levers 8' and 8' ivoted at 84 and 85 and engagin at 86 an 87 e es 88 and 89 of the rail 7, an

connectin ro 90. .Theraisingand lowering.

of the rai 7 is effected and controlled by an arm91 fixed upon the bolt 85 and kept with an antifriction roller 301 in eng ement with an eccentric upon a shaft 16 which is in the mannerhereinafter described continuously rotated from the driving shaft A. y

In the position III,--the bread with the frontends U of the wrapping still open at both sides has reached the center line of twisting devices located at both sides of the feed track 103. Each of these twisting devices consists of a pair of ton s composed of two grippers or jaws .100. hese grippers are adapted to be closed for theurpose of engaging the open wrapper ends a and to be rotated in the closed position in unison for the purpose of twisting the ripped ends of the wrapper and also to be a vanced towards each other in accordance with the shortening of the ends of the wrapper caused by the twisting whereupon they release the twisted ends of the wrapper after the bread has been wrapped u To enab e the broad ends of the wrapper being mounted upon rotatably journaled bolts 1 with the end of the rotary shaft 104 designed as double-sided racks 250 in order to effect the closing of the tongs during their forward motion towards the ends U of the wrappings and the opening of the tongs during their return motion.

The forward and backward motion is imparted to the tongs by a slideblock 105 which serves for journaling the said spindles 101 of the tongs and is so arranged upon the rotary shaft 104 by means of a key 107 engaging the longitudinal groove 106 of the block 105, that the said block 105 participates in the rotation but is free to slide axially along the shaft 104. In an annular groove of the block 105 there is provided a rotatable ring 108 with pins 109 at both sides engaged by the bifurcated ends 110 of a lever 111 journaled at 112 in arms 113 of the pedestal 114 and which is kept in engagement with the operating face of a pot-shaped eccentric 117 of the shaft 16 with an anti-friction bowl 116 by means of springs 115 engaging the pins 109.

The rotation of the shaft 104 and thus of the slideblock 105 withthe twisting tongs takes place by means of a spur-wheel 120 keyed upon the said shaft 104 which is journaled in the bearing 118 of the pedestal 119.

The spur-wheel 120 gears with a spur-wheel 121 adapted to rotate together with an adjacent spur-wheel 122 rigidly connected with the wheel 121 upon a pivot pin 251 mounted upon the above mentioned pedestal 114. The

drive of the spur-wheel 122 takes place by means of a spur-wheel123 mounted upon the above mentioned shaft 16 by means of a key 132 secured to the shaft and with which a corresponding keyway made in the wheel 123 engages so that the said wheel 123 is obliged to take part in the rotation of the shaft 16 but may together with the pedestal 114 be axially displaced upon the shaft 16 in the manner hereinafter described. The spurwheels are enclosed in a casing 124 mounted upon the pedestal 114. In the same manner as the spur-wheel 123 the eccentric 117 mentioned aboveis coupled with the driving shaft 16 by means ofthe key 132. The eccentric 117 thus rotates with the said shaft but is free to slide upon'it axially, so that it may also together with the pedestal 114 he reciprocated upon the shaft 16.

Around the tapered rear end 104' of the shaft 104 which is journaled in the bearing 118 rotatably as well as longitudinally slideable, a spring 253 is stretched between a collar 130 fixed upon the end 104 and the cap 131 screwed upon the bearing 118, said spring 233 having the tendency to maintain the shaft 104 in its rearposition shown in Fig. 3. The driving shaft 16 is journaled in the bearings 125 of the pedestals 126 and continuously rotated by means of a sprocket wheel 138 from the sprocket wheel 202 of the driving shaft A by means of a chain 203 which is passed over the sprocket wheels 202, 252, 138 and 205. The sprocket wheel 252 serves for stretching the chain and is mounted upon an arm 206 pivoted upon a bolt 204 and adapted to be adjusted in various positions upon the machine framing 209 by means of the slot 207 and screw 208 for the purpose of stretching the chain. The shaft 16'is at its left-hand side end in Fig. 3 secured against lateral displacement by the said sprocket Wheel 138 keyed to it and an outer fixed collar 139 at the intermediate bearing 125 of the pedestal 126.

The two bearing pedestals 126 of the shaft 16 are with their feet 126 fixed upon the supports 133 which are with their flanges 133 secured to the machine frames 209 and 209', as particularly clearly shown in Figs. 2 and 5 to 7 of the drawings. The two twisting mechanisms are onthe other hand adjustable in the direction of the longitudinal axis of v the said driving shaft 16 in order to enable the spacing of the twisting mechanisms to be adapted to different lengths of loaves. For this purpose the pedestals 114 and 119 together with the other parts of the twisting devices are mounted upon slides 134, Figs. 2 and 5 to 7. The. frame 114 consists in one solid piece together with the slide 134, whereas the frame 119 is fastened to the slide 134 by means of screws. The slide 134 is slidably guided in dovetail guides 133 of the frames 133, which are provided with prolongations 133 (Figs. 5,7 and 8) extending through excavations 209' of the lateral frames 209 and 209' towards the inside, so as to produce along guiding track. The slides 134 ride with guide nuts 137 upon the end screw- threads 140 and 140 of a guide screw 136 which is journaled in bearings 220, but is secured against lateral displacement by collars 221. One screw 140 is provided with right-hand screw-thread and the other screw 140 with left-hand screw thread, so that by turning the spindle 136 by means of the handwheel 135 the supports or slides 134 with the twisting mechanisms attached to them can be caused to approach or to recede from each other. The apparatus operates in the following manner:

When the bread reaches the position III.

the slide-block upon the shaft 104, which .U" of the wrapping, so that they grip it between them and twist it together in the manner shown in Fig. 4. As soon as the tongs 100 have closed, the rotary shaft 104 is moved forward against the resistance of the spring 253 during the further advance of the slide- ,tion to each other.

block 105 by means of the engagement of the toothed sectors 102 with the racks 250, so that the tongs'100 also advance in correspondence with the shortening of the wrapper end U due to its twisting so that the shortening of the wrapping is taken into account by the tongs. W en the lever 111 is swung back again by its cooperation vwith the eccentric 117 the shaft 104 is pulled back into its initial position by the spring 253 and the grippers or tongs 100 are opened again.

The stops'5, 9 are now raised and the next loaf is moved forward into the position 111, whereupon the sto s 5 and 9 are lowered again as soon as the loaf as assed below them during its advance. By t is advance, the loaves already wrap ed u .are also'advanced alon the upper feed track 103 and reach at the en of the track a conveyor belt 210 which passes around the pulley 211 and a; second pulley not shown. The drive is efi'ected by means of the pulley 211 'keyled to the shaft 212 which is Journaled in t e side frames of the'machine and'continuously rotated in the direction of the arrow by the above mentioned sprocket wheel 205 which is also keyed to the shaft 212.

Various changes and modifications may be made in the details of the invention without departing from its s irit, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention:

- 1. In a wrapping machinecf the type described havin means for placing a wrapper in the shape 0 a tube around an article, means located at each front end of the article comprising a twisting mechanism for twisti the ends of the wrapper progecting beyon the articles at the ends, an separate drivin means for each twisting mechanism, ai twisting mechanisms and their separate rivin means being mounted as a unit in movable soc ets adapte to be reciprocated with re1a 2. In a wrapping machine ofithe type de-- scribed havin means for placing a wrapper in the shape 0 a tube around an article means located at each front end of the article com prising a twisting mechanism for twistin the ends of the wrapper, projectin beyon the article at the ends, and separate riving means for each twisting mechanism, said twisting mechanisms and their se arate driving means being mounted as a unit in slidably guided sockets, ide nuts upon said supports and a rotata 1e uide spindle withinversely threaded on s upon which said nuts are adapted to be screwed in opposite directions.

3. In a wrapping machine of the type described having means for placing a wrapper in the shape of a tube around an article and at each front end of said article,

nuance per tongs pivoted upon a sleevelike b 00 means between said shaft mounted for reative axial movement within said block, slidably guided sockets for the twistinginechanisms, separate means comprising an eccentric and a lever controlled by it for moving each slide-block forward and backward on said rotary shaft for closing and opening the respective gripper tongs by means of said engaging-means between the grippers and the shaft, separate driving wheels for rotating said rotary shafts of the twisting mechanisms, a driving shaft common to both twisting mechanisms and rotatable in bearings of said sockets, and means for displacing said sockets of the twisting mechanisms axially to said common driving shaft, said eccentrics and said driving wheels being located upon the sockets of the twisting mechanisms and axially slidably coupled with the common driving shaft. 7

In testimony whereof I have, afiixed my 51 grippers and a rotary

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