US3698041A

US3698041A - Can changing in strand material handling

Info

Publication number: US3698041A
Application number: US802694*A
Authority: US
Inventors: Hans B Hertzsch
Original assignee: SPINNEREIMASCHINENBAU INGOLSTA
Current assignee: Deutsche Spinnereimaschinenbau Ingolstadt Niederlassung Der Schubert & Salzer Mas Fab Ag; SPINNEREIMASCHINENBAU INGOLSTA
Priority date: 1962-02-09
Filing date: 1969-02-26
Publication date: 1972-10-17
Anticipated expiration: 1989-10-17
Also published as: US3443287A

Abstract

The automating of can changing in the production of roving. Provision is made for automatically supplying sliver cans to a filling station and for removing filled cans from the filling station.

Description

United States Patent 1151 3,698,041 Hertzsch 1451 *Oct. 17, 1972 1 CAN CHANGING IN STRAND [51] Int. Cl. ..B65h 54/80 MATERIAL HANDLING [58] Field of Search ..19/l59, 159 A, 98; 214/84 [72] Inventor: Hans B. Hertzsch Enschede,

- Netherlands [56] References Cited [73] Assignee: Deutsche Spinnereiinaschinenbau In- UNITED STATES PATENTS gtflstad Niederlassung Schubert 2,199,097 4/1940 Chappelle ..214/s4 x Maschinenfabfik Amen 2,964,802 12/1960 Aono et a1. ..19/98 x gesel'schaft, lngolstad DanubeGer' 3,104,748 9/1963 Schwartz ..214/84 x many Notice: The portion of the term of this FOREIGN PATENTS OR APPUCATIONS patent s qu to

y

13, 6, 865,820 4/1961 Great Britain ..l9/159 has been disclaimed- 910,761 11/1962 Great Britain ..19/159 [22] Filed: Feb. 26, 1969 OTHER A NS [2]] Appl' L694 Japanese Patent Publication No. 37 17,778, published Related US. Application Data 1962' [63] Continuation of Ser. No.- 569,556, July 26, p i E i -D sey Newton 1966, Pat. No. 3,443,287, which is a continua- Attorney-Burgess, Dinklage and Sprung tion-in-part of Ser. No. 256,220, Feb. 1, 1963, abandoned- 57 ABSTRACT [30] Foreign Application Priority Data The automating of can changing in the production of roving. Prov1s1on is made for automatically supplying 91 1962 Gfirmany 38105 sliver cans to a filling station and for removing filled Feb. 12, 1963 Germany ..D 40673 cans from the fi station US. Cl. ..19/159 A 9 Claims, 27 Drawing Figures PATENTEDncm-mn 3.698.041 sum UlUF 14 INVENTOR HANS 8.. HERTZSCH ATTORNEYS.

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PATENTEDUBI 17 I972 SHEET 1n 0F 1 4 INVENTOR HANS B. HERTZSCH ATTORNEYS CAN CHANGING IN STRAND MATERIAL HANDLING This application is a continuation of Ser. No. 569,556, filed July 26, 1966, now US. Pat. No. 3,443,287 which in turn is a continuation-in-part of application Ser. No. 256,220, filed Feb. 1, 1963, now abandoned.

The invention relates to an automatic can changing for machines used, for example, in the production of roving, especially for drawing frames using sliver cans arranged in tandem in the direction of the movement of the sliver.

To reduce to a minimum the loss of production entailed in the manual replacement of sliver cans, various apparatus have been proposed to replace the manual operation with a wholly or partially automatic can change. These known apparatus are adapted to certain particular types of machines used in the production of roving, such as cards, drawing frames, sliver lap machines or combing machines, the can change being performed by swinging the sliver outfeed plate from the full can to an adjacent empty can (German patent 860,913) or by switching the sliver plate from the full to the empty can without changing the location of the cans, in such a manner that the sliver is always discharged in the same direction, but at points further forward or rearward (German patent 882,663). Another group of prior art can filling apparatus produces the can change, in the case of cans arranged in tandem in the direction of the movement of the sliver, by using a pushing device controlled by the meter to push the full can away and at the same time to advance the empty can into the filling position in place of the full can; in this case, dollies or trucks (German Reich patent 574,331) or conveyor belts (German Federal patent 1,036,132) are used for the transport or feeding of the empty cans. Turntables are also known, on which the cans are arranged in a circle, the turntable revolving together with the cans, as each can is filled, by an amount corresponding to the spacing from can to can, thus replacing the full can with an empty one. When these known apparatus are simple in design, they do not entirely eliminate manual handling, and those which are fully automatic in operation are often very complex in construction, and therefore they are prone to mechanical trouble.

The apparatus that forms the subject of the invention is distinct from these known apparatus in that the empty cans are automatically pushed, preferably in a direction perpendicular to that of the movement of the sliver, from a gathering point or collecting area located laterally of the drawing frame, into a ready position within the machine, and the full cans are automatically advanced preferably in the same direction as the movement of the sliver to another gathering point in front of the machine.

According to another feature of the new can chang ing apparatus, one of the transporting means, namely the one designed to carry away full cans, is disposed immediately in front of the place at which the filled cans are ejected, and it can be displaced crosswise to the direction of movement of the sliver, and the transporting means designed to feed empty cans is disposed so as to be displaceable contrary to and parallel with the direction of movement of the sliver, means being provided for the simultaneous displacement of both transporting means by an amount corresponding to the diameter (t) of the aligned cans.

According to a variant of the invention, the empty cans can be fed in by a ramp disposed laterally of the drawing frame and serving as a gathering place for the cans, rather than by conveyances on wheels.

According to the invention, for the purpose of moving the empty cans from the dollies stationed, or feed carriages disposed on both sides of the machine towards the drive box, pushing arms are provided which are displaceable along the rear wall of the machine.

Particularly well suited for the automatic can changing apparatus of the invention are drawing frames of symmetrical construction based on German Federal patent No. 1,097,867, in which the drive box of the machine is disposed in the center. This type of drawing frame, which can be equipped with two,,four or even more heads, is easily accessible from both sides and therefore makes it possible in a simple and efficient manner to bring the empty cans out and the full cans in and to feed slivers to the machine input.

Further details of the can changing apparatus of the invention are described hereinbelow on the basis of various examples of embodiment shown in the drawings.

FIG. 1 is the plan view of a drawing frame of known design based on German Federal patent 1,097,867, the representation being schematic;

FIGS. 2, 3, and 4 show schematic representations of a drawing frame with the apparatus of the invention and indicate stages of the operation in utilization thereof;

FIG. 5 is a perspective view of a drawing frame with c the apparatus of the invention;

FIG. 6 shows the pusher arm drive, in section; FIGS. 7 and 8 show an embodiment of the coupling for connecting a dolly or platform to the pulling member;

FIG. 9 is a schematic representation of the plan view of a drawing frame having two sets of two filling stations or outputs each, and can handling apparatus of the invention;

FIG. 10 shows an embodiment of can changing apparatus on a drawing frame with two outputs;

F IG. 11 shows the drive of the can dollies for the embodiment shown in FIG. 10;

FIG. 12 is an elevation view of the drive for the can dollies shown in FIG. 10;

FIG. 13 is a plan view of the drive shown in FIG. 12;

FIG. 14 is a cross-section taken on line 14-14 in FIG. 13;

FIG. 15 shows in elevation an automatically operating can changing apparatus for two drawing frames connected in tandem;

FIGS. 16-19 show in schematic form various working positions of the automatic can changing apparatus according to FIG. 15;

FIG. 20 is a detail from FIG. 16, showing in plan a part of the can handling apparatus of drawing frame A;

FIG. 21 shows in perspective the drive of the distributing mechanism shown in plan in FIG. 20;

FIG. 22 shows a filled can stopping device disposed on the roller conveyors intermediate the drawing stations shown in FIG. 16.;

FIG. 23 shows an embodiment for two drawing frames disposed in tandem and having four working stations;

FIGS. 24 and 25 show, respectively, in elevation and plan a braking mechanism used in the apparatus shown in FIG. 16; and

FIGS. 26 and 27 show in schematic form alternative arrangements of the apparatus of the invention.

In the various views, like reference characters refer to corresponding parts.

FIG. 1 represents a drawing frame of the prior art based on German Federal patent l,097,867, having a central drive box 1 and working stations and 10 disposed on the sides of the drive box.

The material being drawn passes through the machine in the direction of the' arrow. The cans 11 and 11' disposed at a filling station are filled beneath the two sliver plates 2 and 2'. After cans 11 and 11' underneath the sliver plates 2 and 2' have been filled, they are pushed out of the machine in the direction of the arrow by means of a prior art can changing apparatus which is connected with a counting mechanism 62 7 (FIG. 10). This ejection is performed by means of pivoting can

forks

60 and 60, while at the same time additional empty cans 12 and 12' shown at ready stations are pushed by these same can forks 60 and 60' into the place of the ejected cans beneath

sliver plates

2 and 2. In the case of the drawing frame represented in FIG. 1, when the can exchange has been completed it is necessary to place another empty sliver can into the machine by hand and take the full can standing in front of the machine and place it by hand on a can dolly or other means of conveyance in order to carry it to where it will be further processed. This manual work is extensively eliminated or substantially simplified by the innovation represented schematically in FIGS. 2 to 25.

To this end, a motor 20 is disposed on the rear of drive box 1, said motor driving two threaded shafts 22 and 22'. Screws 22 and 22' are horizontally mounted in tubes and 25, respectively, the latter being held on supports 28 fastened to the floor (FIG. 5). Supports 28 are high enough for the can platforms or

trucks

6, 7, 8, and 9, when empty, to pass easily under tubes 25 and 25'. Pushing

arms

24 and 24 fastened to nuts 23 and 23' are moved horizontally by the screws 22 and 22', pushing arms 24 and 24' extending out of tubes 25 and 25' through slots 26 and 26' (FIG. 6). 27 is an adjustable safety clutch which slips in case the pushing

arms

24 and 24 should bind, thus preventing the breakage of the pushing arm or destruction of any cans that might become jammed. Around the base F of the machine (FIG. 5) runs an endless cable drive or pulling member 31 which is driven by a motor disposed in the central drive box 1 of the drawing frame. Over the

rollers

33 and 34 runs a second endless pulling member 35, which is coupled with the pulling member 31 and reverses the latters direction of movement. The arrows P and P indicate, respectively, the direction of movement of the pulling

members

31 and 35. Two couplings 44 on the front of the machine and one coupling 44 on one side of the machine are fastened to the pulling member 31 for the purpose of interconnecting the can dollies 7, 8, and 9. Another coupling for can dolly 6 is located on the pulling member 35.

FIG. 7 shows in detail an example of the embodiment of the coupling 44- for hitching the can dollies to the pulling

member

31 or 35, as the case may be. Coupling 44 is fastened to pulling members 31 by rivets 32. It consists substantially of a hook 45 with a ramp surface 45', and is associated with a slide 41. Slide 41 slides along a track fastened to the base F of the machine or to the floor. The stud 50 with head 50' is fastened to the can dolly and is engaged with the coupling 44 as soon as the pulling member 31 moves in the direction of arrow P The pulling member 35 engages in like manner with a dolly stud 50.

In the hitching of a can dolly, stud 50 first slides up on ramp surface 45' and then snaps into coupling 44 behind hook 45, upon manually pushing the can dolly up the coupling ramp 45 in the direction of the arrow P. The can dolly is thus lifted briefly when stud runs up ramp surface 45 of hook 45, until stud 50 drops behind hoom 45. To prevent slide 41 from being bent or made to bind by the weight of the can dolly when it is hitched on, a supporting ramp 43 is disposed alongside track 40 in the starting position of pulling member 31 or in the hitching position of coupling 44, and plate 42 rests on this ramp.

As shown in FIG. 2, two can platforms or

dollies

6 and 9 are placed on'either side of the machine as a gathering place for four empty cans each, l3, 14, 15, and 16, and 13', 14', 15', and 16', respectively, and

each is coupled to the pulling

member

31, or 35 as the case may be, by a coupling 44. The empty can platform 6 is disposed with the portion thereof carrying cans l3 and 14, aligned with the fork 60' when the fork is in the position shown in FIG. 2, for movement of the cans to the fork, upon operation of the pushing arm 24. Thus, a portion of the platform 6 serves as a slideway for the cans. What is said as to empty can platform 6 applies also to platform 9. Upon shifting of the

empty can platforms

6 and 9, as is elsewhere described herein, the said platforms move so that the parts thereof carrying, respectively,

cans

15' and 16', and 15 and 16, serve as the slideway. In the front of the drawing frame there are placed two can

dollies

7 and 8 which are not carrying any cans and which are hitched in like manner by couplings 44 to pulling members 31 and serve as a gathering point for the full cans. During the can changing process, the full cans are pushed onto

can dollies

7 and 8, ready to be hauled away.

The manner of operation of the apparatus explained in detail above is the following:

To ready the drawing frame, two can platforms or

dollies

6 and 9 are brought with empty cans to the can input sides, and two

empty can dollies

7 and 8 are brought to the can output side in such manner that the dollies are hooked into the couplings 44. The can dollies can also be hitched by a movement of cable or pulling member 31 in the direction of the arrow P (FIG. 7).

When the cans l1 and 11', which are at the filling stations, are filled, they are pushed by

forks

60 and 60 onto

can dollies

7 and 8 provided for this purpose. At the same time, forks 60 and 60' push empty cans 12 and 12', which are standing in the ready stations in the drawing frame, into the place of the full cans 11 and 11'. After this can change,

forks

60 and 60 are swung up and return to their initial position. Then an appropriate switching device, such as a limit switch 210 or 210' is actuated by

fork

60 or 60, or a program switch, starts motor 20 for the operation of the pushing arms 24 and 24'.

The pushing arms 24 and 24' move perpendicularly to the direction of movement of the sliver over a slideway for the cans and push the next empty cans l3 and 13' from the can dollies 9 and 6, respectively, into the ready position in the machine.

As soon as

cans

12 and 12 are filled, the

forks

60 and 60 are operated again, and the process described above is repeated, filled

cans

12 and 12 being pushed onto

can dollies

8 and 7, respectively, which already have cans 11 and 11' on them, while the

empty cans

13 and 13 take their place. The next empty cans 14 and 14' are then brought into the machine by the pushing arms 24 and 24' in the manner described above.

Thereupon the pushing arms 24 and 24' return to their initial position. The shifting of the can dollies now takes place while the drawing frame continues to operate withoutinterruption. To this end, the motor 30 housed in the central drive box 1 of the drawing frame moves the pulling member 31 at least the amount of the can diameter t, so that the can dollies 6, 7, 8', and 9 hitched to the pulling

members

31 and 35 all simultaneously assume the positions shown in FIG. 3. The can dollies 6 and 9 thereby pass beneath the tubes 25 and 25', respectively. Cans l5 and 16, and 15 and 16, then stand on the can dollies 6 and 9 in the ready position, while can

dollies

7 and 8 are carried laterally in front of the machine in such a manner that they can receive additional full cans. The movement of the can dollies is controlled as is described in more detail in reference to FIG. 16, hereinafter. Thus, movement of arm 24 (in response to actuationof switch 210 which operates motor 20) actuates switch 211, whereupon motor 20 is stopped to stop travel of arm 24, at which time can 13 has been moved into fork 60. Upon further operation of motor 20 in response to actuation of switch 210, the arm 24.moves on to contact switch 212. I

This switch is then effective to cause operation of the motor 20 to return the arm 24 to its initial position and to operate the motor 30 to shift the cam dollies. Arm 24 and switches 210', 211', and 212' operate in a similar manner. The succeeding can change is performed in the same manner as described above.

FIG. 4 shows the final phase of the can change after the can dollies 6 and 9 have been emptied and can

dollies

7 and 8 are occupied by full cans. The two can

dollies

7 and 8, as well as the now empty can

dollies

6 and 9 can be automatically released from the couplings 44 when the pulling

member

31, or 35 as the case may be, is run back by motor 30. This operation of the motor 30 can be manually controlled or can be programmed.

It is not until now, after four automatic can changes, that more can dollies carrying empty cans and empty can dollies for receiving the full cans have to be brought up, whereupon the process described is repeated.

In another embodiment of the can changing apparatus of the invention, which is shown in FIG. 10 (see also FIG. 16, where a tandem operation employing two similarly outfitted drawing frames is shown), ramps 54 and 54 are placed at each side of the machine as a gathering point for the empty cans, instead of the can dollies 6 and 9. A number of empty cans'can be placed simultaneously on this ramp-three, for example-so that, together with an empty can that is already in the machine, at least four empty cans are available for the successive automatic changes. To guide the empty cans such as can 63, ramps 54 and 54' have two guide rails 57-58 and 57'58', respectively (FIGS. 10 and 16). Pushing arms 56 and 56', which are driven by

screws

22 and 22 mounted in a sheltered manner behind the machine in much the same way as the pushing arms 24 and 24' shown in FIGS. 1 to 6, emerge from slots 55 and 55', respectively. The exchanging of full cans 61 and 61' for empty cans 63 and 63' is performed in the machine by means of forks 60 and 60', which have already been mentioned.

Can

dollies

7 and 8, which, in contrast to the embodiment described above, are connected by a snap coupling 51 to a pulling member in the form of a toothed rack 64, serve to receive the full cans. As shown in FIG. 11, rack 64 is driven by a motor 65 mounted in the central drive box 1 of the drawing frame, through transmission gears, 67, 68, 69, and 70. The snap coupling 51 for

can dollies

7 and 8 is shown in detail in FIGS. 12, 13, and 14.

Rack 64 is fastened by means of two screws 72 and 72' to the bottom of a carriage 71. At its two extremities rack 64 is provided with fingers 64' which can operate limit switches 213 and 2114 fastened between the channel irons 75. Guiding rollers 73 and bearing rollers 74 are provided at the four corners of carriage 71. Bearing rollers 74 run in the channel irons 75 fastened to the floor in front of the machine, while the guiding rollers 73 bear against the upper edge of the channel irons and thus provide for lateral guidance of the carriage 71. r

The hitching of the can dollies 7 and 8 to the snap coupling 51 is performed, as shown in FIG. 10, by passing the can dollies sidewise over the channel irons 75, so that the dollies are guided by the latter and their raised edges 7' and 8' encounter the elastic buffers 83 and 83', respectively. Catch pins 84 and 84' fastened to the underside of the can dollies thus encounter hasps and 80', respectively, and depress them until

catches

84 and 84 snap into

holes

82 and 82 in hasps 80 and 80', respectively. When the catches engage,

hasps

80 and 80, which can be pivoted downward elastically against springs 81 and 811', respectively, snap back up and the can dollies are hitched to the carriage 71.

The snap coupling 51 is released by depressing the pedal 76, whereupon the

adjustable studs

79 and 79 fastened to the pedal, force the hasps 80 and 80' downward against the pressure of springs 81 and 81', thus releasing the catch pins 84 and 84', and both can

dollies

7 and 8 are pushed away from carriage 71 by the pressure of elastic buffers 83 and 83', respectively.

This modified embodiment of the can changing apparatus represented in FIG. 10, and FIGS. 16-19 and FIG. 23 functions in the same manner as the embodiment described before. In this embodiment, however, the ramps 54 and 54' serve as slideways for the empty cans. The empty cans are brought up on can dollies and taken off the dollies and placed on ramps 54 and 54' which serve as the gathering points for empty sliver cans. The ,can

dollies

7 and 8 are then hitched to the snap coupling 51 to serve as a gathering point for the full cans. At least three empty cans 63 are placed on each of the ramps 54 and 54', so that, including an empty can which is already in the ready position on each side of the machine, the machine is provided with four empty cans on each side. Ramps 54 and 54' can alsobe made long enough to accommodate four or more empty cans. After cans 61 and 61', located underneath the sliver output devices 2 and 2' of the drawing frame (FIG. have been filled with the quantity of sliver determined by the counting mechanism 62, they are ejected by the forks 60 and 60', respectively, onto the can dollies 7 and 8. A switch 210 is operated by the returning

forks

60 and 60, and motor 20 is energized, so that the three empty cans on ramp 54 (and those on ramp 54') are pushed by the pushing

arms

56 and 56 in the direction of the machine. When the first of the three cans standing in readiness is far enough into the machine, the pushing arm 56 reaches a switch 209 (FIG. 16) which again shuts off the motor.

After the next ejection'of a full can from the drawing frame, switch 210 gives the second command for the pushing arms 56 and 56' to operate, whereupon the next empty can is pushed into the machine. The movement of the pushing arms is halted by the switch 211, which simultaneously caused the advancement of

can dollies

7 and 8, which in the meantime have been carrying two full cans, doing so by, energizing motor 65 (FIG. 11). After the can dollies have been shifted, motor 65 is shut off by

limit switch

213 or 214, which are operated by fingers 64' on rack 64 as soon as the can dolly is in its correct position.

In the next can change, the pushing arms 56 and 56' are once again actuated by the limit switch 210, whereupon the last of the three cans placed in readiness on ramp S4 is pushed into the machine. As soon as the can is'sufficiently far into the machine, pushing arm 56 encounters a limit switch and shuts off motor 20. At

the same time, limit switch 212 initiates the return movement of pusher arms 56 and'56 and reverses the polarity of motor 65. Motor 65 remains unenergized, however, since the reversal of its polarity serves only as a preparation for the filling of the next four cans, during which the two fresh can dollies hitched to the snap coupling must be displaced in the opposite direction.

The changing apparatus that has been described is suitable, with the same advantages, for use with other machines used in the preparation of roving than the drawing frames of German Federal patent 1,036,132; for example, it can be used in drawing frames with a plurality of outputs as in FIG. 9, and also on cards, combing machines and others.

FIG. 9 shows schematically, by way of example, a drawing frame in which two working stations are arranged on each side of the central drive box 1, so that the can dollies serving as a gathering point for the sliver cans can carry eight cans each. It is also possible to apply the invention advantageously to drawing frames having a drive box 1 disposed on one side only. Thus, in FIG. 9, the

dollies

6 and 7 and associated parts could be dispensed with and the unit could be operated with only the

dollies

8 and 9 and associated parts.

It is furthermore possible to use racks or hydraulically or pneumatically powered pistons to operate

arms

24 or 56, rather than a screw. Instead of the special

auxiliary motors

20 and 30 for producing the dolly and pushing-arm movements, an auxiliary shaft can be used that can be clutch-coupled to the constantly rotating main drive shaft of the machine.

Likewise, instead of coupling 44 or snap coupling 51, other appropriate entraining devices can be used for hitching the can dolly to the pulling

member

31 or 64, such as magnetic coupling or the like.

In order still further to automatize the operation of the drawing of slivers, it is possible to arrange a plurality of drawing frames in tandem, each equipped with the system of the invention, so that the sliver cans that pass through the first drawing frame serve directly as the input to the second drawing frame, and the cans will continually circulate between two drawing frames.

FIG. 15 shows such a combination of two drawing frames equipped with the can changing apparatus of the invention, and operating as one unit with partially automatic sliver can circulation, in which a drawing frame B equipped with the can changing apparatus of the invention is preceded by a second drawing frame A equipped also with the can changing apparatus of the invention. DRawing frame A receives its input material from cans 117 by way of the sliver guide rack 118, having sliver guides 118a, while drawing frame B is supplied with material by way of sliver guide 119, having sliver guides 119a, from sliver cans placed on roller conveyors. The above-mentioned sliver guide racks do not appear in FIGS. 16 to 19 and 23.

Referring to the last-mentioned figures, roller conveyors -86-87 and 85'86'87' are disposed in parallel sets on either side of drawing frame A, conveyors 86-86 and 8687' being operated as pairs. The roller conveyors are disposed in the manner that they form ramps inclined for gravity operation of the conveyors. Roller conveyors 85 and 85' are return conveyors and are tilted in the direction of drawing frame A, so that all cans placed onit tend to move in the direction of arrow P The conveyor pairs 86-87 and 86-87" are tilted towards frame B, so that cans placed on them tend to move in the direction of arrow P Con veyor pairs 86-87 and 86-87' are divided by

stops

88 and 88, respectively, into waiting station disposed adjacent the drawing frame A and an emptying station disposed adjacent the drawing frame B. Distributing pushers 89 and 89' at the output of drawing frame A distribute the full cans to both conveyors of pairs 86-87 and 86'87', respectively.

Conveyors 85 and 85', parallelly associated with conveyor pairs 86 87 and 86-87', respectively, for the return of the empty cans, have brakes 90 and 90', respectively, at their lower ends. The purpose of these brakes is to prevent cans from

roller conveyors

85 and 85 from getting behind pushers 56 and 56' when the latter are moved out of their extreme end position against the machine frame for the purpose of pushing the next empty can in along the slideway toward the filling position. Brakes 90 and 90' hold back the empty cans on roller conveyors 85 and 85', respectively, until pushers 56 and 56' have regained their extreme end position. A blocking device of this type is shown in detail in FIGS. 24 and 25. A portion of the lateral margin constructed as a brake is mounted pivotally and connected through a lever 111 mounted underneath the roller conveyor to a tension spring 112 which pivots brakes 90 or 90' into the roller conveyor as soon as they are no longer held back by pushers 56 and 56'. In this manner, the cans on the roller conveyor are held fast until pushers 56 and 56', upon returning to their end position, encounter the extension 113 of brakes 90 and 90' and thereby swing the brake out of the roller conveyor against the tension of spring 112. In this situation the roller conveyor is again released and the next cans are able to roll unhampered in front of pushers 56 and 56'. A stop 114 prevents

brakes

90 and 90 from swinging too far if there should be no can to be held, thus getting out of the reach of the pushing arms 56 and 56'.

In FIG. is shown the driving mechanism of the distributing pushers 89 and 89'. As in the case of the two pushing

arms

56 and 56, the two distributing pushers 89 and 89', which are affixed to the nuts 115 and 115', respectively, are moved by

screws

91 and 91, respectively. Screws 91 and 91' are driven by a motor 92 located in drive box 1 of the drawing frame, through a transmission 93 and a safety clutch 94.

FIG. 22 shows the stops 88 which divide

roller conveyors

86 and 87. Stops 88 are passed through slots created in the roller conveyor into the path of the cans, and they can be withdrawn by means of pedal 95 against the tension of spring 96.

The transfer of the cans from drawing frame A to drawing frame B is performed in the manner indicated in FIGS. 16 to 19.

When forks 60 and 60' have ejected filled cans from drawing frame A, they return to their position of rest and operate a limit switch 201. The limit switch 20] starts the motor 20 that drives screw 22 and thus moves the pushers 56 and 56'. Thereupon, on both sides of the machine, one of the cans carried by each of

roller conveyors

85 and 85 is pushed into the drawing frame (FIG. 18). At the end of this insertion, pusher 56 encounters another limit switch 202 which reverses motor 20 so that it rotates in the opposite direction. Pushers 56 and 56' are thereby moved back to their starting position, while the empty can remains in the ready position in the drawing frame. As soon as pushers 56 and 56' return to their original position, they operate a limit switch 203 by which motor 20 is shut off.

This process is repeated until the eight empty cans in the ready position on roller conveyor 85 have been pushed successively into the drawing frame and filled. After there are no longer any more empty cans at the entrance to the drawing frame, the machine is automatically shut off by a program switching mechanism (not shown) which can be actuated by the movement of the arms 90 and 90' across the conveyors 85, 85', and thus the opportunity is created for preparing some more empty cans on roller conveyor 85 or for transfer ring the cans which in the meantime have been emptied into drawing frame B from roller conveyor pairs.8687 and 86'-87' to their associated return conveyors 85 and 85'.

The eight cans successively filled in a continuous operation at each working station of drawing frameA must be distributed four to each of the two roller conveyors associated with that station (FIG. 16). To this end, distributing

pushers

89 and 89 are provided, which are set in movement by motor 92 controlled by a program switching mechanism of the prior art. This can be done in two different ways.

In the first method, filled cans from the working stations of drawing frame A are first fed by the forks .60, 60 and gravity, respectively, to conveyors 87 and 87' four filled cans have been delivered to each of these conveyors. Thereupon, the

pushers

89, 89'. filled cans from the two working stationsare fed respectively to

conveyors

86, 86. Thus, program switch 204 receives, after each can ejection brought about by forks 60 and 60' (drawing frame A), an impulse which rotates it by 45. After four impulses, corresponding to four full cans ejected from each of the two working stations of the machine, the program switch completes half of a revolution and closes a contact. This contact now forwards tomotor 92 (FIG. 20) the impulse produced by limit switch 201 which starts the insertion of empty cans by pushers 56 and 56'. In this manner, the full cans ejected from the machine are pushed by distributing pushers 89 and 89' onto the roller conveyors 86 and 86', respectively, which are disposed parallel to roller conveyors 87 and 87'. After four full cans have been pushed onto each of roller conveyors 86 and 86', the program switching mechanism has performed a full revolution, whereupon the machine is automatically shut off.

The cans on the bottom half of roller conveyor pairs 86-87 and 86'-87', which have served to feed material into drawing frame B and in the meantime have run empty, are now transferred by hand to return conveyors 85 and 85', and are thus fed back as empties to drawing frame A (FIG. 16). By operating the pedals 95 and 95', the full cans that are on the upper half of the roller conveyor pairs (FIG. 16) roll down towards the drawing frame B (FIG. 17), where they then serve to' feed the sliver to the latter. Both drawing frames A and B are now placed into operation again, and the abovedescribed procedure is repeated.

The second way of supplying the two roller conveyor pairs 86-87 and 86'-87 uniformly with full cans consists in adjusting the program switching mechanism in such a manner that one can is distributed to first one and then the other of the two roller conveyors associated with a working station. As soon as'the portions of roller conveyor pairs 8687 and 86'-87' located above the stops 88 and 88', respectively, are occupied by four cans each, four

limit switches

205, 206, 207, and 208 are operated, whereupon drawing frame A ceases to operate.

In the above-described embodiment of the invention, two drawing frames A and B are associated in tandem with one another havingtwo heads and two outputs each. Whereas the full cans are transported over roller conveyors from drawing frame A to drawing frame B and are returned as empties to drawing frame A, drawing frame B receives its empty cans from can dollies, or from feeding ramps 54, 54'.

Dollies

7 and 8 receive full cans in front of drawing frame B.

The process of FIGS. 16-19 has been described in detail in connection with the embodiment of FIG. 10.

Of course, it is possible to have drawing frame B followed by another drawing operation, so that drawing frame B and a similar drawing frame work together in the same manner as drawing frames A and B.

Conveyor belts or other appropriate transporting means can also be used instead of roller conveyors.

As shown by way of example in FIG. 23, the apparatus of the invention is not restrictedto drawing

Claims

1. Apparatus for depositing strand material in cans comprising: a. means defining a filling station adapted to receive a can for the filling thereof; b. a filling device means for receiving strand material and directing it into the can; c. strand supply means for supplying strand material to the filling device means from a locus horizontally spaced from the filling station; d. means defining a ready station for an empty can destined for the filling station; e. means defining an elongated full can storage station for receiving full cans from the filling station; f. means defining an elongated empty can storage station for storing of empty cans for delivery to the ready station; g. said full can storage station and empty can storage station being disposed side by side in parallel relation; h. means for transferring a full can from the filling station to the full can storage station and transferring an empty can from the ready station to the filling station to replace the full can transferred to the full can storage station; i. means for transferring an empty can from the empty can storage station to the ready station to replace empty can transferred from the ready station to the filling station; j. control means responsive to operation of the first mentioned transfer means (h) and effective to actuate the secondmentioned transfer means i. for operation of the second-mentioned transfer means as aforesaid.

2. Apparatus for depositing strand material in cans comprising: a. means defining a filling station adapted to receive a can for the filling thereof; b. a filling device means for receiving strand material and directing it into a can at the filling station; c. strand supply means for supplying strand material to the filling device means; d. means defining a ready station for an empty can destined for the filling station; e. means defining an elongated full can storage station for receiving full cans from the filling station; f. means defining an elongated empty can storage station for storing of empty cans for delivery to the ready station; g. said full can storage station empty can storage station being disposed side by side in parallel relation; h. means for transferring a full can from the filling station to the full can storage station; i. means for transferring an empty can from the ready station to the filling station to replace the full can transferred to the full can storage station; j. means for transferring an empty can from the empty can storage station to the ready station to replace empty can transferred from the ready station to the filling station in a direction laterally to the transfer of the empty cans from the empty can storage station to the ready station; k. control means responsive to operation of the first mentioned transfer means (h) and effective to actuate the second mentioned transfer means (i) and the third mentioned transfer means (j) for operation as aforesaid.

2. Apparatus according to claim 6, wherein said full can storage station and said filled can emptying station are an inclined ramp and being separated by a stop said stop being movable to permit travel of filled cans from the full can storage station to the filled can emptying station.

3. Apparatus according to claim 2, wherein said first-mentioned transfer means (h) and said second-mentioned transfer means (i) are combined as a fork.

4. Apparatus according to claim 2, wherein said empty can storage station includes an inclined ramp over which empty cans can move under influence of gravity and wherein said third-mentioned transfer means (j) includes at least a brake preventing such movement of empty cans and being actuated for releasing said empty cans in timed relation to the movement of said first-mention transfer means.

5. Apparatus according to claim 2, and further including a slideway over which empty cans can be moved from said empty can storage station to said ready station and wherein said third-mentioned transfer Means (j) includes a brake for preventing movement of empty cans from said empty can storage station to the slideway and a pusher means for moving said empty cans along the slideway to said ready station, said pusher means being actuated in timed relation to the movement of said first-mentioned transfer means (h) and said brake being actuated by said pusher means.

6. Apparatus according to claim 2, wherein said full can storage station forms part of a first drawing frame and is interconnected with a filled can emptying station adjacent a second drawing frame and said empty can storage station of said first drawing frame includes conveying means adapted for receiving empty cans at said second drawing frame and for moving said emptied cans to the first mentioned drawing frame.

8. A drawing frame having a filling station adapted to receive cans for the filling thereof, first mover means for moving filled cans from the filling station horizontally and to displace filled cans from the filling station, a slideway for empty cans extending laterally of the direction of travel of the filled cans moved from the filling stations by said by said first mover means and supplying empty cans along the slideway for delivery thereof to the filling station, second mover means for moving empty cans along said slideway, control means responsive to operation of the first mover means and effective to actuate said second mover means for operation thereof as aforesaid, conveying means for receiving filled cans moved from the filling station by said first mover means, comprising an inclined ramp over which said filled cans can travel to a following drawing frame under influence of gravity, said conveying means comprises a waiting station and a filled can emptying station, said waiting station being a portion of said conveying means adjacent the first-mentioned drawing frame and said filled can emptying station being a portion of said conveying means adjacent said following drawing frame, a movable stop separating the waiting station from the filled can emptying station, said stop being movable to permit travel of filled cans from the waiting station to the filled can emptying station.

9. A drawing frame having a filling station adapted to receive cans for the filling thereof, first mover means for moving filled cans from the filling station horizontally and to displace filled cans from the filling station, a slideway for empty cans extending laterally of the direction of travel of the filled cans moved from the filling stations by said first mover means and for supplying empty cans along the slideway for delivery thereof to the filling station, second mover means for moving empty cans along said slideway, control means responsive to operation of the first mover means and effective to actuate said second mover means for operation thereof as aforesaid, conveying means for receiving filled cans moved from the filling station by said first mover means, comprising an inclined ramp over which said filled cans can travel to a following drawing frame under influence of gravity, a return conveying means for receiving at the following drawing frame emptied cans, said return conveying means being inclined roller conveyor for travel of empty cans toward the first mentioned drawing frame and extending to the slideway of first mentioned drawing frame for delivery of empty cans to said slideway, said second mover means for sliding empty cans along the slideway comprising a pusher arm, said arm being movable from a rear position on said slideway therealong toward the first mentioned drawing frame to push empty cans toward the filling station, the return conveying means connecting with the slideway to deposit a can in the sLideway when the pusher arm is in its rear position and the slideway in front of the arm is unoccupied by a can, brake means for preventing movement of cans from the return conveying means to the slideway when the pusher arm of the slideway is advanced from its rear position toward the first drawing frame, said brake being actuated by the pusher arm upon movement thereof from its rear position.